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|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
1701.00224 | Lei Wu | Jinmian Li, Zong-guo Si, Lei Wu, Jason Yue | Central-edge asymmetry as a probe of Higgs-top coupling in $t\bar{t}h$
production at LHC | minor changes, version accepted by PLB | null | 10.1016/j.physletb.2018.02.009 | null | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The Higgs-top coupling plays a central role in the hierarchy problem and the
vacuum stability of the Standard Model (SM). We propose a central-edge
asymmetry ($A_{CE}$) to probe the CP violating Higgs-top coupling in dileptonic
channel of $t\bar{t}h(\to b\bar{b})$ production at the LHC. We demonstrate that
the CP-violating Higgs-top coupling can affect the central-edge asymmetry
through distorting $\Delta y_{\ell^+\ell^-}$ distribution because of the
contribution of new top charge asymmetric term. Since $\Delta y_{\ell^+\ell^-}$
distribution is frame-independent and has a good discrimination even in boosted
regime, we use the jet substructure technique to enhance the observability of
the dileptonic channel of $t\bar{t}h$ production. We find that (1) the
significance of dileptonic channel of $t\bar{t}h$ production can reach
$5\sigma$ for CP phase $\xi=0,\pi/4,\pi/2$ when the luminosity ${\cal
L}=795,993,1276$ fb$^{-1}$ at 14 TeV LHC. (2) the central-edge asymmetry
$A_{CE}$ show a good discrimination power of CP phase of $t\bar{t}h$
interaction, which are -40.26\%, -26.60\%, -9.47\% for $\xi=0$, $\pi/4$, $
\pi/2$ respectively and are hardly affected by the event selections. Besides,
by performing the binned-$\chi^2$ analysis of $\Delta y_{\ell^+\ell^-}$
distribution, we find that the scalar and pseudo-scalar interactions can be
distinguished at 95\% C.L. level at 14 TeV HL-LHC.
| [
{
"created": "Sun, 1 Jan 2017 10:18:59 GMT",
"version": "v1"
},
{
"created": "Sun, 4 Feb 2018 13:39:30 GMT",
"version": "v2"
}
] | 2018-02-14 | [
[
"Li",
"Jinmian",
""
],
[
"Si",
"Zong-guo",
""
],
[
"Wu",
"Lei",
""
],
[
"Yue",
"Jason",
""
]
] | The Higgs-top coupling plays a central role in the hierarchy problem and the vacuum stability of the Standard Model (SM). We propose a central-edge asymmetry ($A_{CE}$) to probe the CP violating Higgs-top coupling in dileptonic channel of $t\bar{t}h(\to b\bar{b})$ production at the LHC. We demonstrate that the CP-violating Higgs-top coupling can affect the central-edge asymmetry through distorting $\Delta y_{\ell^+\ell^-}$ distribution because of the contribution of new top charge asymmetric term. Since $\Delta y_{\ell^+\ell^-}$ distribution is frame-independent and has a good discrimination even in boosted regime, we use the jet substructure technique to enhance the observability of the dileptonic channel of $t\bar{t}h$ production. We find that (1) the significance of dileptonic channel of $t\bar{t}h$ production can reach $5\sigma$ for CP phase $\xi=0,\pi/4,\pi/2$ when the luminosity ${\cal L}=795,993,1276$ fb$^{-1}$ at 14 TeV LHC. (2) the central-edge asymmetry $A_{CE}$ show a good discrimination power of CP phase of $t\bar{t}h$ interaction, which are -40.26\%, -26.60\%, -9.47\% for $\xi=0$, $\pi/4$, $ \pi/2$ respectively and are hardly affected by the event selections. Besides, by performing the binned-$\chi^2$ analysis of $\Delta y_{\ell^+\ell^-}$ distribution, we find that the scalar and pseudo-scalar interactions can be distinguished at 95\% C.L. level at 14 TeV HL-LHC. |
hep-ph/0203191 | Xiao-Gang He | X.-G. He, H.-Y. Jin and J. P. Ma | Radiative Decay of $\Upsilon$ into a Scalar Glueball | RevTex, 12 pages no figures. Several numerical errors corrected | Phys.Rev. D66 (2002) 074015 | 10.1103/PhysRevD.66.074015 | null | hep-ph hep-ex | null | We study the radiative decay of $\Upsilon$ into a scalar glueball $\Upsilon
\to \gamma G_s$ using QCD factorization. We find that for this process the
non-perturbative effects can be factorized into a matrix element well defined
in non-relativistic QCD (NRQCD) and the gluon distribution amplitude. The same
NRQCD matrix element appears also in leptonic decay of $\Upsilon$ and therefore
can be determined from data. In the asymptotic limit the gluon distribution
amplitude is known up to a normalization constant. Using a QCD sum-rule
calculation for the normalization constant, we obtain $Br(\Upsilon \to \gamma
G_s)$ to be in the range $(1\sim 2)\times 10^{-3}$. We also discuss some of the
implications for $\Upsilon \to \gamma f_i$ decays. Near future data from
CLEO-III can provide crucial information about scalar glueball properties.
| [
{
"created": "Wed, 20 Mar 2002 07:09:57 GMT",
"version": "v1"
},
{
"created": "Sat, 11 May 2002 00:46:08 GMT",
"version": "v2"
},
{
"created": "Mon, 1 Jul 2002 23:41:28 GMT",
"version": "v3"
}
] | 2009-11-07 | [
[
"He",
"X. -G.",
""
],
[
"Jin",
"H. -Y.",
""
],
[
"Ma",
"J. P.",
""
]
] | We study the radiative decay of $\Upsilon$ into a scalar glueball $\Upsilon \to \gamma G_s$ using QCD factorization. We find that for this process the non-perturbative effects can be factorized into a matrix element well defined in non-relativistic QCD (NRQCD) and the gluon distribution amplitude. The same NRQCD matrix element appears also in leptonic decay of $\Upsilon$ and therefore can be determined from data. In the asymptotic limit the gluon distribution amplitude is known up to a normalization constant. Using a QCD sum-rule calculation for the normalization constant, we obtain $Br(\Upsilon \to \gamma G_s)$ to be in the range $(1\sim 2)\times 10^{-3}$. We also discuss some of the implications for $\Upsilon \to \gamma f_i$ decays. Near future data from CLEO-III can provide crucial information about scalar glueball properties. |
1410.4314 | Zuo-Tang Liang | Shu-Yi Wei, Kai-bao Chen, Yu-kun Song, Zuo-tang Liang | Leading and higher twist contributions in semi-inclusive e+e-
annihilation at high energies | 33 pages, 4 figures | Phys. Rev. D 91, 034015 (2015) | 10.1103/PhysRevD.91.034015 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | By applying the collinear expansion to the semi-inclusive hadron production
process $e^++e^-\to h+\bar q(jet)+X$ at high energies, we construct a
theoretical framework where the leading and higher twist contributions at the
leading perturbative QCD can be calculated systematically. With this framework,
we calculate the contributions up to twist-3 for spin-0, spin-1/2 and spin-1
hadrons respectively. We present the results for the hadronic tensors, the
differential cross sections, the azimuthal asymmetries, and the polarizations
of the hadrons.
| [
{
"created": "Thu, 16 Oct 2014 06:55:29 GMT",
"version": "v1"
},
{
"created": "Sat, 1 Nov 2014 07:25:58 GMT",
"version": "v2"
}
] | 2015-03-05 | [
[
"Wei",
"Shu-Yi",
""
],
[
"Chen",
"Kai-bao",
""
],
[
"Song",
"Yu-kun",
""
],
[
"Liang",
"Zuo-tang",
""
]
] | By applying the collinear expansion to the semi-inclusive hadron production process $e^++e^-\to h+\bar q(jet)+X$ at high energies, we construct a theoretical framework where the leading and higher twist contributions at the leading perturbative QCD can be calculated systematically. With this framework, we calculate the contributions up to twist-3 for spin-0, spin-1/2 and spin-1 hadrons respectively. We present the results for the hadronic tensors, the differential cross sections, the azimuthal asymmetries, and the polarizations of the hadrons. |
2103.13776 | Shahin Atashbar Tehrani | Maral Salajegheh, S. Mohammad Moosavi Nejad, S. Atashbar Tehrani | Improved determination of strange distribution function from the global
analysis using BHPS model | 12 pages, 5 figs , 2 tables | Few-Body Syst. (2021) 62:16 | 10.1007/s00601-021-01601-8 | null | hep-ph | http://creativecommons.org/licenses/by-sa/4.0/ | We study the impact of intrinsic strange (IS) component of nucleon sea on the
global analysis of parton distribution functions (PDFs) considering a wide
range of experimental data. To this aim, we consider two scenarios on the basis
of BHPS model results for the IS distribution. In the first scenario, we apply
the results presented through the BHPS model and in the second scenario we use
its evolved distributions. For each scenarios, we present the limit of the IS
probability $ {\cal P}_5^{s\bar{s}} $ for the standard tolerance criteria $
\Delta\chi^2=1 $ and $ 18.112 $ at $ 1\sigma $ and $ 4\sigma $ levels. Our
results show that the experimental data can tolerate an IS component with a
greater probability $ {\cal P}_5^{s\bar{s}} $ if one employs the second
scenario. We obtain $ {\cal P}_5^{s\bar{s}}\approx 0.01 $ and $ {\cal
P}_5^{s\bar{s}}\approx 0.025 $ for $ \Delta\chi^2=1 $ and $18.112$,
respectively, at the $ 4\sigma $ level. We also calculate the ratio of
strange-to-light sea-quark densities $r_s$ in the proton both including and
excluding the IS component. Our results show that one can obtain a higher value
for the ratio $r_s$ if the IS component is included.
| [
{
"created": "Thu, 25 Mar 2021 12:00:13 GMT",
"version": "v1"
}
] | 2021-03-26 | [
[
"Salajegheh",
"Maral",
""
],
[
"Nejad",
"S. Mohammad Moosavi",
""
],
[
"Tehrani",
"S. Atashbar",
""
]
] | We study the impact of intrinsic strange (IS) component of nucleon sea on the global analysis of parton distribution functions (PDFs) considering a wide range of experimental data. To this aim, we consider two scenarios on the basis of BHPS model results for the IS distribution. In the first scenario, we apply the results presented through the BHPS model and in the second scenario we use its evolved distributions. For each scenarios, we present the limit of the IS probability $ {\cal P}_5^{s\bar{s}} $ for the standard tolerance criteria $ \Delta\chi^2=1 $ and $ 18.112 $ at $ 1\sigma $ and $ 4\sigma $ levels. Our results show that the experimental data can tolerate an IS component with a greater probability $ {\cal P}_5^{s\bar{s}} $ if one employs the second scenario. We obtain $ {\cal P}_5^{s\bar{s}}\approx 0.01 $ and $ {\cal P}_5^{s\bar{s}}\approx 0.025 $ for $ \Delta\chi^2=1 $ and $18.112$, respectively, at the $ 4\sigma $ level. We also calculate the ratio of strange-to-light sea-quark densities $r_s$ in the proton both including and excluding the IS component. Our results show that one can obtain a higher value for the ratio $r_s$ if the IS component is included. |
1212.3168 | Maxim Chernodub | M. N. Chernodub, Jos Van Doorsselaere, Tigran Kalaydzhyan, Henri
Verschelde | On chromoelectric (super)conductivity of the Yang-Mills vacuum | 4 pages, 2 figures; v2: misprints corrected, matches published
version | Phys. Lett. B 730 (2014) 63 | 10.1016/j.physletb.2014.01.029 | null | hep-ph hep-lat hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We argue that in the Copenhagen (``spaghetti'') picture of the QCD vacuum the
chromomagnetic flux tubes exhibit chromoelectric superconductivity. We show
that the superconducting chromoelectric currents in the tubes may be induced by
the topological charge density.
| [
{
"created": "Thu, 13 Dec 2012 13:34:14 GMT",
"version": "v1"
},
{
"created": "Tue, 28 Jan 2014 09:47:18 GMT",
"version": "v2"
}
] | 2014-01-29 | [
[
"Chernodub",
"M. N.",
""
],
[
"Van Doorsselaere",
"Jos",
""
],
[
"Kalaydzhyan",
"Tigran",
""
],
[
"Verschelde",
"Henri",
""
]
] | We argue that in the Copenhagen (``spaghetti'') picture of the QCD vacuum the chromomagnetic flux tubes exhibit chromoelectric superconductivity. We show that the superconducting chromoelectric currents in the tubes may be induced by the topological charge density. |
hep-ph/0107156 | Alessandro Strumia | Andre'de Gouvea, Gian Francesco Giudice, Alessandro Strumia, Kazuhiro
Tobe | Phenomenological implications of neutrinos in extra dimensions | 20 pages, 2 figures. Version 2: we added a note about the NuTeV
anomaly | Nucl.Phys.B623:395-420,2002 | 10.1016/S0550-3213(01)00621-6 | IFUP-TH/18-2001 and CERN-TH/2001-184 | hep-ph | null | Standard Model singlet neutrinos propagating in extra dimensions induce small
Dirac neutrino masses. While it seems rather unlikely that their Kaluza-Klein
excitations directly participate in the observed neutrino oscillations, their
virtual exchange may lead to detectable signatures in future neutrino
experiments and in rare charged lepton processes. We show how these effects can
be described by specific dimension-six effective operators and discuss their
experimental signals.
| [
{
"created": "Fri, 13 Jul 2001 16:51:10 GMT",
"version": "v1"
},
{
"created": "Thu, 1 Nov 2001 17:59:49 GMT",
"version": "v2"
}
] | 2010-05-28 | [
[
"Gouvea",
"Andre'de",
""
],
[
"Giudice",
"Gian Francesco",
""
],
[
"Strumia",
"Alessandro",
""
],
[
"Tobe",
"Kazuhiro",
""
]
] | Standard Model singlet neutrinos propagating in extra dimensions induce small Dirac neutrino masses. While it seems rather unlikely that their Kaluza-Klein excitations directly participate in the observed neutrino oscillations, their virtual exchange may lead to detectable signatures in future neutrino experiments and in rare charged lepton processes. We show how these effects can be described by specific dimension-six effective operators and discuss their experimental signals. |
1811.07634 | Haiqing Zhou | Hui-Yun Cao, Hai-Qing Zhou | Correction to the energy spectrum of $^1S_0$ heavy quarkonia due to
two-gluon annihilation effect | null | Phys. Rev. D 99, 074007 (2019) | 10.1103/PhysRevD.99.074007 | null | hep-ph nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this work, the non-relativistic asymptotic behavior of the transition
$q\overline{q}\rightarrow2g\rightarrow q\overline{q}$ in the $^1S_0$ channel is
discussed. Different with the usual calculation which expands the physical
amplitude around the quark anti-quark threshold, we take the quark anti-quark
pairs as off shell and only expand the expression on the three-dimensional
momenta of the quarks and anti-quarks. We calculate the results to order 6. The
imagine part of the results after applying the on shell conditions can
reproduce the non-relativistic QCD (NRQCD) results in leading order of
$\alpha_s$. The real part of the results can be used to estimate the mass shift
of the $^1S_0$ heavy quark anti-quark system due to the $2g$ annihilation
effect. The results can also be used to estimate the energy shifts of the
positronium system due to the two-photon annihilation.
| [
{
"created": "Mon, 19 Nov 2018 12:01:26 GMT",
"version": "v1"
}
] | 2019-04-17 | [
[
"Cao",
"Hui-Yun",
""
],
[
"Zhou",
"Hai-Qing",
""
]
] | In this work, the non-relativistic asymptotic behavior of the transition $q\overline{q}\rightarrow2g\rightarrow q\overline{q}$ in the $^1S_0$ channel is discussed. Different with the usual calculation which expands the physical amplitude around the quark anti-quark threshold, we take the quark anti-quark pairs as off shell and only expand the expression on the three-dimensional momenta of the quarks and anti-quarks. We calculate the results to order 6. The imagine part of the results after applying the on shell conditions can reproduce the non-relativistic QCD (NRQCD) results in leading order of $\alpha_s$. The real part of the results can be used to estimate the mass shift of the $^1S_0$ heavy quark anti-quark system due to the $2g$ annihilation effect. The results can also be used to estimate the energy shifts of the positronium system due to the two-photon annihilation. |
0812.0994 | David Blaschke | D.B. Blaschke, M.P. Dabrowski, V.V. Dmitriev, S.A. Smolyansky, | Kinetic description of W and Z boson creation in the early universe | 4 pages, contribution to the Proceedings of the XIX Int. Baldin
Seminar on High Energy Physics Problems "Relativistic Nuclear Physics and
QCD", Dubna, 29.9.-4.10.2008 | null | null | null | hep-ph astro-ph gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We consider an alternative mechanism for the production of the cosmic
microwave background (CMB) radiation. It is basically due to vacuum pair
creation (VPC) of vector bosons (W and Z) as a consequence of a rapid W and Z
mass generation during the electroweak phase transition in the early Universe.
The mechanism is as follows: after their pair crreation, the vector bosons may
either annihilate directly into photons or decay into leptons and quarks which
subsequently annihilate as lepton-antilepton and quark-antiquark pairs into
photons. Preliminary estimates show that the number of CMB photons obtained
this way can be sufficient to explain the presently observed CMB photon
density. In this contribution we present an exactly soluble model for vacuum
pair creation kinetics.
| [
{
"created": "Thu, 4 Dec 2008 17:55:46 GMT",
"version": "v1"
}
] | 2008-12-08 | [
[
"Blaschke",
"D. B.",
""
],
[
"Dabrowski",
"M. P.",
""
],
[
"Dmitriev",
"V. V.",
""
],
[
"Smolyansky",
"S. A.",
""
]
] | We consider an alternative mechanism for the production of the cosmic microwave background (CMB) radiation. It is basically due to vacuum pair creation (VPC) of vector bosons (W and Z) as a consequence of a rapid W and Z mass generation during the electroweak phase transition in the early Universe. The mechanism is as follows: after their pair crreation, the vector bosons may either annihilate directly into photons or decay into leptons and quarks which subsequently annihilate as lepton-antilepton and quark-antiquark pairs into photons. Preliminary estimates show that the number of CMB photons obtained this way can be sufficient to explain the presently observed CMB photon density. In this contribution we present an exactly soluble model for vacuum pair creation kinetics. |
1804.06358 | Jian Wang | Hai Tao Li, Jian Wang | Next-to-next-to-leading order $N$-jettiness soft function for $tW$
production | 14 pages, 3 figures, published version in PLB | Phys. Lett. B 784 (2018) 397 | 10.1016/j.physletb.2018.08.019 | TUM-HEP-1137/18 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We calculate the $N$-jettiness soft function for $tW$ production up to
next-to-next-to-leading order in QCD, which is an important ingredient of the
$N$-jettiness subtraction method for predicting the differential cross sections
of massive coloured particle productions. The divergent parts of the results
have been checked using the renormalization group equations controlled by the
soft anomalous dimension.
| [
{
"created": "Tue, 17 Apr 2018 16:31:15 GMT",
"version": "v1"
},
{
"created": "Tue, 28 Aug 2018 06:55:37 GMT",
"version": "v2"
}
] | 2018-08-29 | [
[
"Li",
"Hai Tao",
""
],
[
"Wang",
"Jian",
""
]
] | We calculate the $N$-jettiness soft function for $tW$ production up to next-to-next-to-leading order in QCD, which is an important ingredient of the $N$-jettiness subtraction method for predicting the differential cross sections of massive coloured particle productions. The divergent parts of the results have been checked using the renormalization group equations controlled by the soft anomalous dimension. |
hep-ph/9712482 | Bernd Kniehl | J. Binnewies (Hamburg University), B.A. Kniehl (MPI Munich), G. Kramer
(Hamburg University) | Predictions for D^*+- Photoproduction at HERA with New Fragmentation
Functions from LEP1 | 23 pages (Latex), 7 figures (Postscript) | Phys.Rev.D58:014014,1998 | 10.1103/PhysRevD.58.014014 | DESY 97-241, MPI/PhT/97-88 | hep-ph hep-ex | null | We present new sets of nonperturbative fragmentation functions for D^*+-
mesons, both at leading and next-to-leading order in the MS-bar factorization
scheme with five massless quark flavors. They are determined by fitting the
latest OPAL and ALEPH data on inclusive D^*+- production in e^+e^-
annihilation. We take the charm-quark fragmentation function to be of the form
proposed by Peterson et al. and thus obtain new values of the epsilon_c
parameter, which are specific for our choice of factorization scheme. With
these fragmentation functions, recent data on inclusive D^*+- photoproduction
in ep collisions at HERA are reasonably well reproduced.
| [
{
"created": "Mon, 22 Dec 1997 14:33:30 GMT",
"version": "v1"
}
] | 2011-01-25 | [
[
"Binnewies",
"J.",
"",
"Hamburg University"
],
[
"Kniehl",
"B. A.",
"",
"MPI Munich"
],
[
"Kramer",
"G.",
"",
"Hamburg University"
]
] | We present new sets of nonperturbative fragmentation functions for D^*+- mesons, both at leading and next-to-leading order in the MS-bar factorization scheme with five massless quark flavors. They are determined by fitting the latest OPAL and ALEPH data on inclusive D^*+- production in e^+e^- annihilation. We take the charm-quark fragmentation function to be of the form proposed by Peterson et al. and thus obtain new values of the epsilon_c parameter, which are specific for our choice of factorization scheme. With these fragmentation functions, recent data on inclusive D^*+- photoproduction in ep collisions at HERA are reasonably well reproduced. |
hep-ph/0412399 | Vladimir Zoller | V.R. Zoller (ITEP, Moscow) | Triple-pomeron dynamics: valence vs. glue | 4 pages, 1 Postscript figure, To appear in Proc. of DIFFRACTION 2004,
Int. Workshop on Diffraction in High-Energy Physics, Cala Gonone, Sardinia,
Italy, Sept. 18-23, 2004 | null | 10.1016/j.nuclphysbps.2005.02.099 | null | hep-ph | null | Three pomerons are known to couple via the gluon loop and interactions of
this kind which are responsible for high-mass diffraction are described in
terms of the gluonic structure function of the QCD pomeron. We show that the
triple-pomeron coupling via the light quark loop associated with the
``valence'' in the pomeron is of the same strength as the purely gluonic
coupling. The large $Q^2$ behavior of this new contribution is described by the
DLLA evolution from the non-perturbative $f\bar f$ valence state of the
pomeron. Numerical estimates of the high-mass diffraction structure functions
based on the consistent account of both couplings are in good agreement with
experimental data.
| [
{
"created": "Tue, 28 Dec 2004 13:55:01 GMT",
"version": "v1"
}
] | 2009-11-10 | [
[
"Zoller",
"V. R.",
"",
"ITEP, Moscow"
]
] | Three pomerons are known to couple via the gluon loop and interactions of this kind which are responsible for high-mass diffraction are described in terms of the gluonic structure function of the QCD pomeron. We show that the triple-pomeron coupling via the light quark loop associated with the ``valence'' in the pomeron is of the same strength as the purely gluonic coupling. The large $Q^2$ behavior of this new contribution is described by the DLLA evolution from the non-perturbative $f\bar f$ valence state of the pomeron. Numerical estimates of the high-mass diffraction structure functions based on the consistent account of both couplings are in good agreement with experimental data. |
hep-ph/0202092 | Gerhard Buchalla | Gerhard Buchalla | Heavy Quark Theory | 50 pages, Lectures given at the 55th Scottish Universities Summer
School in Physics, 7-23 August 2001, St. Andrews, Scotland | null | null | CERN-TH/2002-018 | hep-ph | null | These lectures describe the most important theoretical methods in b-physics.
We discuss the formalism of effective weak Hamiltonians, heavy quark effective
theory, the heavy quark expansion for inclusive decays of b-hadrons and,
finally, the more recent ideas of QCD factorization for exclusive nonleptonic B
decays. While the main emphasis is put on introducing the basic theoretical
concepts, some key applications in phenomenology are also presented for
illustration.
| [
{
"created": "Sat, 9 Feb 2002 23:06:48 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Buchalla",
"Gerhard",
""
]
] | These lectures describe the most important theoretical methods in b-physics. We discuss the formalism of effective weak Hamiltonians, heavy quark effective theory, the heavy quark expansion for inclusive decays of b-hadrons and, finally, the more recent ideas of QCD factorization for exclusive nonleptonic B decays. While the main emphasis is put on introducing the basic theoretical concepts, some key applications in phenomenology are also presented for illustration. |
1403.4582 | Zahra Ghalenovi | Zahra Ghalenovi, Ali Akbar Rajabi, Si-xue Qin, Dirk. H. Rischke | Ground-State Masses and Magnetic Moments of Heavy Baryons | null | Mod Phys Lett A 29 (2014) 1460106 | 10.1142/S0217732314501065 | null | hep-ph nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this work we study single, double, and triple heavy-flavor baryons using
the hypercentral approach in the framework of the non-relativistic quark model.
Considering two different confining potentials and an improved form of the
hyperfine interaction, we calculate the ground-state masses of heavy baryons
and also the ground-state magnetic moments of single charm and beauty baryons
with J^(P) =3/2^(+). The obtained results are in good agreement with
experimental data and those of other works.
| [
{
"created": "Tue, 18 Mar 2014 19:32:25 GMT",
"version": "v1"
}
] | 2021-11-09 | [
[
"Ghalenovi",
"Zahra",
""
],
[
"Rajabi",
"Ali Akbar",
""
],
[
"Qin",
"Si-xue",
""
],
[
"Rischke",
"Dirk. H.",
""
]
] | In this work we study single, double, and triple heavy-flavor baryons using the hypercentral approach in the framework of the non-relativistic quark model. Considering two different confining potentials and an improved form of the hyperfine interaction, we calculate the ground-state masses of heavy baryons and also the ground-state magnetic moments of single charm and beauty baryons with J^(P) =3/2^(+). The obtained results are in good agreement with experimental data and those of other works. |
0705.2193 | Kirill Tuchin | Kirill Tuchin | Forward hadron production in high energy pA collisions: from RHIC to LHC | 16 pages, 8 figures; discussion added and a few typos corrected | Nucl.Phys.A798:61-73,2008 | 10.1016/j.nuclphysa.2007.10.008 | RBRC-670 | hep-ph nucl-ex nucl-th | null | We present a calculation of Pi, D and B mesons production at RHIC and LHC
energies based upon the KKT model of gluon saturation. We discuss dependence of
the nuclear modification factor on rapidity and transverse momentum.
| [
{
"created": "Tue, 15 May 2007 17:28:45 GMT",
"version": "v1"
},
{
"created": "Wed, 14 Nov 2007 20:09:21 GMT",
"version": "v2"
}
] | 2008-11-26 | [
[
"Tuchin",
"Kirill",
""
]
] | We present a calculation of Pi, D and B mesons production at RHIC and LHC energies based upon the KKT model of gluon saturation. We discuss dependence of the nuclear modification factor on rapidity and transverse momentum. |
0908.2570 | Schoeffel Laurent | Laurent Schoeffel (CEA Saclay, Irfu/SPP) | GPDs at HERA and perspectives at COMPASS | 3 pages, 1 figure, proceedings of the 2009 Europhysics Conference on
High Energy Physics, 16-22 July 2009 Krakow, Poland | PoS EPS-HEP2009 2009:337,2009 | null | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Measurements of the deep-inelastic scattering (DIS) of leptons and nucleons,
$e+p\to e+X$, allow the extraction of Parton Distribution Functions (PDFs)
which describe the longitudinal momentum carried by the quarks, anti-quarks and
gluons that make up the fast-moving nucleons. While PDFs provide crucial input
to perturbative Quantum Chromodynamic (QCD) calculations of processes involving
hadrons, they do not provide a complete picture of the partonic structure of
nucleons. In particular, PDFs contain neither information on the correlations
between partons nor on their transverse motion. Hard exclusive processes, in
which the nucleon remains intact, have emerged in recent years as prime
candidates to complement this essentially one dimentional picture. The simplest
exclusive process is the deeply virtual Compton scattering (DVCS) or exclusive
production of real photon, $e + p \to e + \gamma + p$. This process is of
particular interest as it has both a clear experimental signature and is
calculable in perturbative QCD. The DVCS reaction can be regarded as the
elastic scattering of the virtual photon off the proton via a colourless
exchange, producing a real photon in the final state. In the Bjorken scaling
regime, QCD calculations assume that the exchange involves two partons, having
different longitudinal and transverse momenta, in a colourless configuration.
These unequal momenta or skewing are a consequence of the mass difference
between the incoming virtual photon and the outgoing real photon. This
skewedness effect can be interpreted in the context of generalised parton
distributions (GPDs). In this proceeding, we examine typical measurements from
HERA and prospects for COMPASS at CERN, that can bring new insights on the
quarks/gluons imaging of the nucleon.
| [
{
"created": "Tue, 18 Aug 2009 13:27:26 GMT",
"version": "v1"
}
] | 2014-11-20 | [
[
"Schoeffel",
"Laurent",
"",
"CEA Saclay, Irfu/SPP"
]
] | Measurements of the deep-inelastic scattering (DIS) of leptons and nucleons, $e+p\to e+X$, allow the extraction of Parton Distribution Functions (PDFs) which describe the longitudinal momentum carried by the quarks, anti-quarks and gluons that make up the fast-moving nucleons. While PDFs provide crucial input to perturbative Quantum Chromodynamic (QCD) calculations of processes involving hadrons, they do not provide a complete picture of the partonic structure of nucleons. In particular, PDFs contain neither information on the correlations between partons nor on their transverse motion. Hard exclusive processes, in which the nucleon remains intact, have emerged in recent years as prime candidates to complement this essentially one dimentional picture. The simplest exclusive process is the deeply virtual Compton scattering (DVCS) or exclusive production of real photon, $e + p \to e + \gamma + p$. This process is of particular interest as it has both a clear experimental signature and is calculable in perturbative QCD. The DVCS reaction can be regarded as the elastic scattering of the virtual photon off the proton via a colourless exchange, producing a real photon in the final state. In the Bjorken scaling regime, QCD calculations assume that the exchange involves two partons, having different longitudinal and transverse momenta, in a colourless configuration. These unequal momenta or skewing are a consequence of the mass difference between the incoming virtual photon and the outgoing real photon. This skewedness effect can be interpreted in the context of generalised parton distributions (GPDs). In this proceeding, we examine typical measurements from HERA and prospects for COMPASS at CERN, that can bring new insights on the quarks/gluons imaging of the nucleon. |
2309.03553 | Francesco Sannino | Vigilante Di Risi, Davide Iacobacci, Francesco Sannino | $\Lambda_b \rightarrow \Lambda_c^{\ast}$ at $1\,/\,m_c^2$ heavy quark
order | Revised version with typos corrected. 66 pages, one figure with 10
subfigures | null | null | null | hep-ph hep-lat | http://creativecommons.org/licenses/by/4.0/ | We systematically compute the $\Lambda_b(p, s_b) \to \Lambda_c(2595)^+$ and
$\Lambda_b(p, s_b) \to \Lambda_c(2625)^+$ form factors within the Heavy Quark
Effective Theory (HQET) framework including $\mathcal{O}(1/m_c^2)$. Besides
taking into account the Standard Model-like vector and axial contributions, we
further determine tensor and pseudo-tensor form factors. Our work constitutes a
step forward with respect to previous analyses allowing for a comprehensive
study of the matrix element parametrisation stemming from the HQET formalism.
Finally, we demonstrate that the resulting form factors agree well with lattice
Quantum Chromodynamics (LQCD) determinations stressing the need and relevance
of the newly derived $1/m_c^2$ corrections.
| [
{
"created": "Thu, 7 Sep 2023 08:21:57 GMT",
"version": "v1"
},
{
"created": "Thu, 4 Apr 2024 13:04:41 GMT",
"version": "v2"
}
] | 2024-04-05 | [
[
"Di Risi",
"Vigilante",
""
],
[
"Iacobacci",
"Davide",
""
],
[
"Sannino",
"Francesco",
""
]
] | We systematically compute the $\Lambda_b(p, s_b) \to \Lambda_c(2595)^+$ and $\Lambda_b(p, s_b) \to \Lambda_c(2625)^+$ form factors within the Heavy Quark Effective Theory (HQET) framework including $\mathcal{O}(1/m_c^2)$. Besides taking into account the Standard Model-like vector and axial contributions, we further determine tensor and pseudo-tensor form factors. Our work constitutes a step forward with respect to previous analyses allowing for a comprehensive study of the matrix element parametrisation stemming from the HQET formalism. Finally, we demonstrate that the resulting form factors agree well with lattice Quantum Chromodynamics (LQCD) determinations stressing the need and relevance of the newly derived $1/m_c^2$ corrections. |
hep-ph/9402266 | Wim deBoer | W. de Boer (University Karlsruhe) | Grand Unified Theories and Supersymmetry in Particle Physics and
Cosmology | IEKP-KA/94-01 preprint, 103 pages, now figures with reduced size | Prog.Part.Nucl.Phys.33:201-302,1994 | 10.1016/0146-6410(94)90045-0 | IEKP-KA/94-01 | hep-ph | null | A review is given on the consistency checks of GUT, which unify the
electroweak and strong nuclear forces into a single theory. Such theories
predict a new kind of force, which could provide answers to several open
questions in cosmology. The possible role of such a ``primeval'' force will be
discussed in the framework of the Big Bang Theory. Although such a force cannot
be observed directly, there are several predictions of GUT's, which can be
verified at low energies. The MSSM distinguishes itself from other GUT's by a
successful prediction of many unrelated phenomena with a minimum number of
parameters. Among them: a) Unification of the couplings constants; b)
Unification of the masses; c) Existence of dark matter; d) Proton decay; e)
electroweak symmetry breaking at a scale far below the unification scale. A
combined fit shows that indeed the MSSM model can satisfy all these constraints
simultaneously. The corresponding constraints on the as yet unknown top mass,
the strong coupling constant, and all SUSY masses are given within the minimal
model, taking into account the complete second order RGE's for the couplings
and the one-loop corrected Higgs potential for the calculation of the Z and the
Higgs masses.
| [
{
"created": "Thu, 10 Feb 1994 11:08:33 GMT",
"version": "v1"
},
{
"created": "Fri, 18 Mar 1994 12:24:29 GMT",
"version": "v2"
},
{
"created": "Mon, 21 Mar 1994 09:58:46 GMT",
"version": "v3"
},
{
"created": "Thu, 26 May 1994 12:59:57 GMT",
"version": "v4"
},
{
"c... | 2010-01-22 | [
[
"de Boer",
"W.",
"",
"University Karlsruhe"
]
] | A review is given on the consistency checks of GUT, which unify the electroweak and strong nuclear forces into a single theory. Such theories predict a new kind of force, which could provide answers to several open questions in cosmology. The possible role of such a ``primeval'' force will be discussed in the framework of the Big Bang Theory. Although such a force cannot be observed directly, there are several predictions of GUT's, which can be verified at low energies. The MSSM distinguishes itself from other GUT's by a successful prediction of many unrelated phenomena with a minimum number of parameters. Among them: a) Unification of the couplings constants; b) Unification of the masses; c) Existence of dark matter; d) Proton decay; e) electroweak symmetry breaking at a scale far below the unification scale. A combined fit shows that indeed the MSSM model can satisfy all these constraints simultaneously. The corresponding constraints on the as yet unknown top mass, the strong coupling constant, and all SUSY masses are given within the minimal model, taking into account the complete second order RGE's for the couplings and the one-loop corrected Higgs potential for the calculation of the Z and the Higgs masses. |
hep-ph/9703406 | Han-Werner Hammer | H.-W. Hammer (1 and 2) and M.J. Ramsey-Musolf (1 and 3) ((1) INT, U.
of Washington, (2) Inst. f. Kernphysik, U. Mainz, (3) U. of Connecticut) | Nucleon Vector Strangeness Form Factors: Multi-pion Continuum and the
OZI Rule | 18 pages, LaTex, 4 PS figures, uses epsf.sty, rotate.sty, revised to
include 3\pi -> \omega resonance and e^+ e^- data | Phys.Lett. B416 (1998) 5-15 | 10.1016/S0370-2693(97)01322-1 | INT DOE/ER/40561-317-INT97-00-169 and MKPH-T-97-10 | hep-ph nucl-th | null | We estimate the 3 \pi continuum contribution to the nucleon strange quark
vector current form factors, including the effect of a 3 \pi <----> \rho \pi
resonance. We find the magnitude of this OZI-violating contribution to be
comparable to that of typical OZI-allowed contributions. We also study the
isoscalar electromagnetic form factors, and find that the presence of a \rho
\pi resonance in the multi-pion continuum may generate an appreciable
contribution.
| [
{
"created": "Tue, 25 Mar 1997 01:24:58 GMT",
"version": "v1"
},
{
"created": "Tue, 22 Jul 1997 21:09:22 GMT",
"version": "v2"
}
] | 2009-10-30 | [
[
"Hammer",
"H. -W.",
"",
"1 and 2"
],
[
"Ramsey-Musolf",
"M. J.",
"",
"1 and 3"
]
] | We estimate the 3 \pi continuum contribution to the nucleon strange quark vector current form factors, including the effect of a 3 \pi <----> \rho \pi resonance. We find the magnitude of this OZI-violating contribution to be comparable to that of typical OZI-allowed contributions. We also study the isoscalar electromagnetic form factors, and find that the presence of a \rho \pi resonance in the multi-pion continuum may generate an appreciable contribution. |
1505.07950 | Fuminobu Takahashi | Fuminobu Takahashi | Inflation and Higgs | 6 pages, 1 figure. Presented at the 2nd Toyama International Workshop
on "Higgs as a Probe of New Physics 2015" (HPNP2015), Toyama, Japan, February
11-15, 2015. Author's note: This contribution is based on 1006.2801,
1008.2956, 1008.4457, 1108.0070, 1203.0323, 1403.4132, 1408.5556, and
1502.03725 | null | null | TU-996 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We briefly review several Higgs inflation models and discuss their
cosmological implications. We first classify the inflation models according to
the predicted value of the tensor-to-scalar ratio: (i) $r = {\cal
O}(0.01-0.1)$, (ii) $r = {\cal O}(10^{-3})$, and (iii) $r \ll 10^{-3}$. For
each case we study (i) the Higgs inflation with a running kinetic term, (ii)
the Higgs inflation with a non-minimal coupling to gravity, and (iii) the $B-L$
Higgs inflation. In the last case we introduce supersymmetry to suppress the
Coleman-Weinberg corrections for successful inflation, and derive the upper
bound on the SUSY breaking scale. Interestingly, the SUSY $B-L$ Higgs inflation
requires the SUSY breaking scale of order ${\cal O}(100)$\,TeV to explain the
observed spectral index. We briefly discuss a topological Higgs inflation which
explains the origin of the standard model near-criticality. We also mention the
possibility of Higgs domain walls and the gravitational waves emitted by the
collapsing domain walls.
| [
{
"created": "Fri, 29 May 2015 07:28:50 GMT",
"version": "v1"
}
] | 2015-06-01 | [
[
"Takahashi",
"Fuminobu",
""
]
] | We briefly review several Higgs inflation models and discuss their cosmological implications. We first classify the inflation models according to the predicted value of the tensor-to-scalar ratio: (i) $r = {\cal O}(0.01-0.1)$, (ii) $r = {\cal O}(10^{-3})$, and (iii) $r \ll 10^{-3}$. For each case we study (i) the Higgs inflation with a running kinetic term, (ii) the Higgs inflation with a non-minimal coupling to gravity, and (iii) the $B-L$ Higgs inflation. In the last case we introduce supersymmetry to suppress the Coleman-Weinberg corrections for successful inflation, and derive the upper bound on the SUSY breaking scale. Interestingly, the SUSY $B-L$ Higgs inflation requires the SUSY breaking scale of order ${\cal O}(100)$\,TeV to explain the observed spectral index. We briefly discuss a topological Higgs inflation which explains the origin of the standard model near-criticality. We also mention the possibility of Higgs domain walls and the gravitational waves emitted by the collapsing domain walls. |
hep-ph/0312163 | Kevork Abazajian | Kevork Abazajian | The Cosmological Energy Density of Neutrinos from Oscillation
Measurements | 4 pages, Proceedings of NuFact 03, 5th International Workshop on
Neutrino Factories & Superbeams, 5-11 June 2003, Columbia University, New
York | null | 10.1063/1.1818410 | null | hep-ph astro-ph | null | The emerging structure of the neutrino mass matrix, when combined with the
primordial element abundances, places the most stringent constraint on the
flavor asymmetries in the cosmological neutrino background and therefore its
energy density. I review the mechanism of synchronized neutrino oscillations in
the an early universe with degenerate (asymmetric) neutrino and antineutrino
densities and the implications of refined measurements of neutrino parameters.
| [
{
"created": "Fri, 12 Dec 2003 01:38:26 GMT",
"version": "v1"
}
] | 2009-11-10 | [
[
"Abazajian",
"Kevork",
""
]
] | The emerging structure of the neutrino mass matrix, when combined with the primordial element abundances, places the most stringent constraint on the flavor asymmetries in the cosmological neutrino background and therefore its energy density. I review the mechanism of synchronized neutrino oscillations in the an early universe with degenerate (asymmetric) neutrino and antineutrino densities and the implications of refined measurements of neutrino parameters. |
1909.01753 | Giancarlo Rossi | Giancarlo Rossi, Gabriele Veneziano | $P_c$ Photo-production And Decay | 6 pages, 11 figures | null | null | null | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The 2015 LHCb discovery of a structure (denoted by $P_c^+$) decaying in
$J/\psi \,p$ and conjectured to be a penta-quark state, has triggered a renewed
interest in the question of possible existence of multi-quark states not
predicted by the naive quark model. In this talk we present some considerations
on $P_c$ photo-production experiments, aimed at testing its multi-quark
interpretation in the framework of a 40-years-old string-junction picture that
allows a unified description of baryons, tetra-, and penta-quark states.
| [
{
"created": "Wed, 4 Sep 2019 12:51:22 GMT",
"version": "v1"
}
] | 2019-09-05 | [
[
"Rossi",
"Giancarlo",
""
],
[
"Veneziano",
"Gabriele",
""
]
] | The 2015 LHCb discovery of a structure (denoted by $P_c^+$) decaying in $J/\psi \,p$ and conjectured to be a penta-quark state, has triggered a renewed interest in the question of possible existence of multi-quark states not predicted by the naive quark model. In this talk we present some considerations on $P_c$ photo-production experiments, aimed at testing its multi-quark interpretation in the framework of a 40-years-old string-junction picture that allows a unified description of baryons, tetra-, and penta-quark states. |
0711.1049 | Jacobo L\'opez-Pav\'on | J.Lopez-Pavon | Non-unitary leptonic mixing and CP-violation | 3 pages, 2 eps figures, based on talk given at NuFact07, Okayama,
Japan, 6-11 August 2007; prepared using LaTeX package for publication in the
AIP Conference Proceedings | AIPConf.Proc.981:219-221,2008 | 10.1063/1.2898939 | null | hep-ph | null | Some theories of new physics accounting for neutrino masses can give rise to
a low-energy non-unitary leptonic mixing matrix. It is shown that the
CP-asymmetries in the $\nu_\mu\to \nu_\tau$ channel are an excellent probe of
such new physics. In adition, we clarify the relationship betweeen our
framework and the so called "non-standard neutrino interactions" scenarios: the
sensitivities explored here apply as well to such constructions, except for
extremely fine-tuned cancellations.
| [
{
"created": "Wed, 7 Nov 2007 14:54:50 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Lopez-Pavon",
"J.",
""
]
] | Some theories of new physics accounting for neutrino masses can give rise to a low-energy non-unitary leptonic mixing matrix. It is shown that the CP-asymmetries in the $\nu_\mu\to \nu_\tau$ channel are an excellent probe of such new physics. In adition, we clarify the relationship betweeen our framework and the so called "non-standard neutrino interactions" scenarios: the sensitivities explored here apply as well to such constructions, except for extremely fine-tuned cancellations. |
hep-ph/0503130 | Carlos E. Yaguna | Graciela Gelmini (UCLA), Shmuel Nussinov (Tel Aviv U.), Carlos E.
Yaguna (UCLA) | On photon splitting in theories with Lorentz invariance violation | 3 pages; v2: discussion enlarged, results unchanged | JCAP 0506 (2005) 012 | 10.1088/1475-7516/2005/06/012 | null | hep-ph | null | In a model with Lorentz invariance violation implemented through modified
dispersion relations, we estimate the rate for the decay process gamma -> 3
gamma and find that it provides a relevant bound on Lorentz invariance
violation.
| [
{
"created": "Mon, 14 Mar 2005 17:45:44 GMT",
"version": "v1"
},
{
"created": "Mon, 23 May 2005 18:50:06 GMT",
"version": "v2"
}
] | 2009-11-11 | [
[
"Gelmini",
"Graciela",
"",
"UCLA"
],
[
"Nussinov",
"Shmuel",
"",
"Tel Aviv U."
],
[
"Yaguna",
"Carlos E.",
"",
"UCLA"
]
] | In a model with Lorentz invariance violation implemented through modified dispersion relations, we estimate the rate for the decay process gamma -> 3 gamma and find that it provides a relevant bound on Lorentz invariance violation. |
1506.07685 | Jessica Elevant | Jessica Elevant, Thomas Schwetz | On the determination of the leptonic CP phase | 25 pages, 12 figures. Matches version which is to appear in JHEP. New
appendix with the first anti-neutrino results from T2K is added | null | null | null | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The combination of data from long-baseline and reactor oscillation
experiments leads to a preference of the leptonic CP phase $\delta_{\rm CP}$ in
the range between $\pi$ and $2\pi$. We study the statistical significance of
this hint by performing a Monte Carlo simulation of the relevant data. We find
that the distribution of the standard test statistic used to derive confidence
intervals for $\delta_{\rm CP}$ is highly non-Gaussian and depends on the
unknown true values of $\theta_{23}$ and the neutrino mass ordering. Values of
$\delta_{\rm CP}$ around $\pi/2$ are disfavored at between $2\sigma$ and
$3\sigma$, depending on the unknown true values of $\theta_{23}$ and the mass
ordering. Typically the standard $\chi^2$ approximation leads to over-coverage
of the confidence intervals for $\delta_{\rm CP}$. For the 2-dimensional
confidence region in the ($\delta_{\rm CP},\theta_{23}$) plane the usual
$\chi^2$ approximation is better justified. The 2-dimensional region does not
include the value $\delta_{\rm CP} = \pi/2$ up to the 86.3\% (89.2\%)~CL
assuming a true normal (inverted) mass ordering. Furthermore, we study the
sensitivity to $\delta_{\rm CP}$ and $\theta_{23}$ of an increased exposure of
the T2K experiment, roughly a factor 12 larger than the current exposure and
including also anti-neutrino data. Also in this case deviations from
Gaussianity may be significant, especially if the mass ordering is unknown.
| [
{
"created": "Thu, 25 Jun 2015 10:01:04 GMT",
"version": "v1"
},
{
"created": "Tue, 11 Aug 2015 15:22:58 GMT",
"version": "v2"
}
] | 2015-08-12 | [
[
"Elevant",
"Jessica",
""
],
[
"Schwetz",
"Thomas",
""
]
] | The combination of data from long-baseline and reactor oscillation experiments leads to a preference of the leptonic CP phase $\delta_{\rm CP}$ in the range between $\pi$ and $2\pi$. We study the statistical significance of this hint by performing a Monte Carlo simulation of the relevant data. We find that the distribution of the standard test statistic used to derive confidence intervals for $\delta_{\rm CP}$ is highly non-Gaussian and depends on the unknown true values of $\theta_{23}$ and the neutrino mass ordering. Values of $\delta_{\rm CP}$ around $\pi/2$ are disfavored at between $2\sigma$ and $3\sigma$, depending on the unknown true values of $\theta_{23}$ and the mass ordering. Typically the standard $\chi^2$ approximation leads to over-coverage of the confidence intervals for $\delta_{\rm CP}$. For the 2-dimensional confidence region in the ($\delta_{\rm CP},\theta_{23}$) plane the usual $\chi^2$ approximation is better justified. The 2-dimensional region does not include the value $\delta_{\rm CP} = \pi/2$ up to the 86.3\% (89.2\%)~CL assuming a true normal (inverted) mass ordering. Furthermore, we study the sensitivity to $\delta_{\rm CP}$ and $\theta_{23}$ of an increased exposure of the T2K experiment, roughly a factor 12 larger than the current exposure and including also anti-neutrino data. Also in this case deviations from Gaussianity may be significant, especially if the mass ordering is unknown. |
2210.14176 | Abhijit Kumar Saha | Anish Ghoshal, Dibyendu Nanda, Abhijit Kumar Saha | CMB imprints of high scale non-thermal leptogenesis | Accepted for Publication in Physics Letter B | Phys.Lett.B 849 (2024) 138484 | 10.1016/j.physletb.2024.138484 | null | hep-ph astro-ph.CO | http://creativecommons.org/licenses/by/4.0/ | We study the imprints of high scale non-thermal leptogenesis on cosmic
microwave background (CMB) from the measurements of inflationary spectral index
($n_s$) and tensor-to-scalar ratio ($r$), which otherwise is inaccessible to
the conventional laboratory experiments. We argue that non-thermal production
of baryon (lepton) asymmetry from subsequent decays of inflaton to heavy
right-handed neutrinos (RHN) and RHN to SM leptons is sensitive to the
reheating dynamics in the early Universe after the end of inflation. Such
dependence provides detectable imprints on the $n_s-r$ plane which is well
constrained by the Planck experiment. We investigate two separate cases, (I)
inflaton decays to radiation dominantly and (II) inflaton decays to RHN
dominantly which further decays to the SM particles to reheat the Universe
adequately. Considering a class of $\alpha-$ attractor inflation models, we
obtain the allowed mass ranges for RHN for both cases and thereafter furnish
the estimates for $n_s$ and $r$. The prescription proposed here is general and
can be implemented in various kinds of single-field inflationary models given
the conditions for non-thermal leptogenesis are satisfied.
| [
{
"created": "Tue, 25 Oct 2022 17:12:22 GMT",
"version": "v1"
},
{
"created": "Wed, 3 Jan 2024 18:41:56 GMT",
"version": "v2"
},
{
"created": "Sat, 27 Jan 2024 16:20:00 GMT",
"version": "v3"
}
] | 2024-04-25 | [
[
"Ghoshal",
"Anish",
""
],
[
"Nanda",
"Dibyendu",
""
],
[
"Saha",
"Abhijit Kumar",
""
]
] | We study the imprints of high scale non-thermal leptogenesis on cosmic microwave background (CMB) from the measurements of inflationary spectral index ($n_s$) and tensor-to-scalar ratio ($r$), which otherwise is inaccessible to the conventional laboratory experiments. We argue that non-thermal production of baryon (lepton) asymmetry from subsequent decays of inflaton to heavy right-handed neutrinos (RHN) and RHN to SM leptons is sensitive to the reheating dynamics in the early Universe after the end of inflation. Such dependence provides detectable imprints on the $n_s-r$ plane which is well constrained by the Planck experiment. We investigate two separate cases, (I) inflaton decays to radiation dominantly and (II) inflaton decays to RHN dominantly which further decays to the SM particles to reheat the Universe adequately. Considering a class of $\alpha-$ attractor inflation models, we obtain the allowed mass ranges for RHN for both cases and thereafter furnish the estimates for $n_s$ and $r$. The prescription proposed here is general and can be implemented in various kinds of single-field inflationary models given the conditions for non-thermal leptogenesis are satisfied. |
1407.4466 | Joshua Berger | Yang Bai and Joshua Berger | Coloron-assisted Leptoquarks at the LHC | 5 pages, 4 figures | null | 10.1016/j.physletb.2015.04.046 | SLAC-PUB-16027 | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Recent searches for a first-generation leptoquark by the CMS collaboration
have shown around 2.5 sigma deviations from Standard Model predictions in both
the eejj and e nu jj channels. Furthermore, the eejj invariant mass
distribution has another 2.8 sigma excess from the CMS right-handed W plus
heavy neutrino search. We point out that additional leptoquark production from
a heavy coloron decay can provide a good explanation for all three excesses.
The coloron has a mass around 2.1 TeV and the leptoquark mass can vary from 550
GeV to 650 GeV. A key prediction of this model is an edge in the total m_T
distribution of e nu jj events at around 2.1 TeV.
| [
{
"created": "Wed, 16 Jul 2014 20:00:25 GMT",
"version": "v1"
}
] | 2015-05-20 | [
[
"Bai",
"Yang",
""
],
[
"Berger",
"Joshua",
""
]
] | Recent searches for a first-generation leptoquark by the CMS collaboration have shown around 2.5 sigma deviations from Standard Model predictions in both the eejj and e nu jj channels. Furthermore, the eejj invariant mass distribution has another 2.8 sigma excess from the CMS right-handed W plus heavy neutrino search. We point out that additional leptoquark production from a heavy coloron decay can provide a good explanation for all three excesses. The coloron has a mass around 2.1 TeV and the leptoquark mass can vary from 550 GeV to 650 GeV. A key prediction of this model is an edge in the total m_T distribution of e nu jj events at around 2.1 TeV. |
hep-ph/9510409 | Hans Eggers | H.C. Eggers (McGill and HEPHY Vienna), R. Tabti, C. Gale (McGill) and
K. Haglin (Michigan State) | Dilepton bremsstrahlung from pion-pion scattering in a relativistic OBE
model | REVTeX 3.0, 26 pages plus 15 figures in uuencoded PostScript | Phys.Rev.D53:4822-4837,1996 | 10.1103/PhysRevD.53.4822 | McGill/95--14, HEPHY--PUB 620/95, MSUCL--974 | hep-ph nucl-th | null | We have made a detailed and quantitative study of dilepton production via
bremsstrahlung of a virtual photon during pion-pion collisions. Most
calculations of electromagnetic radiation from strong interaction processes
rely on the soft photon approximation (SPA). The conditions underlying this
approximation are generally violated when dilepton spectra are calculated in
terms of their invariant mass, so that an approach going beyond the SPA becomes
necessary. Superseding previous derivations, we derive an exact formula for the
bremsstrahlung cross section. The resulting formulation is compared to various
forms based on the SPA, the two-particle phase space approximation and
R\"uckl's formula using a relativistic One Boson Exchange (OBE) model. Within
the OBE approach, we show that approximations to the bremsstrahlung dilepton
cross sections often differ greatly from the exact result; discrepancies become
greater both with rising temperature and with invariant mass. Integrated
dilepton production rates are overestimated by R\"uckl-based approximations by
factors 1.5--8.0. The largest discrepancies occur for the reaction $\pi^+\pi^+
\to \pi^+\pi^+\ell^+\ell^-$, where such approximations overestimate the exact
rate by factors ranging from 2 to 30 for invariant masses between 10 and 500
MeV. Our findings, combined with recent estimates of the Landau-Pomeranchuk
effect, indicate that bremsstrahlung dileptons rates in ultrarelativistic heavy
ion collisions should be even more suppressed than had been thought before.
| [
{
"created": "Wed, 25 Oct 1995 19:38:17 GMT",
"version": "v1"
}
] | 2010-01-15 | [
[
"Eggers",
"H. C.",
"",
"McGill and HEPHY Vienna"
],
[
"Tabti",
"R.",
"",
"McGill"
],
[
"Gale",
"C.",
"",
"McGill"
],
[
"Haglin",
"K.",
"",
"Michigan State"
]
] | We have made a detailed and quantitative study of dilepton production via bremsstrahlung of a virtual photon during pion-pion collisions. Most calculations of electromagnetic radiation from strong interaction processes rely on the soft photon approximation (SPA). The conditions underlying this approximation are generally violated when dilepton spectra are calculated in terms of their invariant mass, so that an approach going beyond the SPA becomes necessary. Superseding previous derivations, we derive an exact formula for the bremsstrahlung cross section. The resulting formulation is compared to various forms based on the SPA, the two-particle phase space approximation and R\"uckl's formula using a relativistic One Boson Exchange (OBE) model. Within the OBE approach, we show that approximations to the bremsstrahlung dilepton cross sections often differ greatly from the exact result; discrepancies become greater both with rising temperature and with invariant mass. Integrated dilepton production rates are overestimated by R\"uckl-based approximations by factors 1.5--8.0. The largest discrepancies occur for the reaction $\pi^+\pi^+ \to \pi^+\pi^+\ell^+\ell^-$, where such approximations overestimate the exact rate by factors ranging from 2 to 30 for invariant masses between 10 and 500 MeV. Our findings, combined with recent estimates of the Landau-Pomeranchuk effect, indicate that bremsstrahlung dileptons rates in ultrarelativistic heavy ion collisions should be even more suppressed than had been thought before. |
hep-ph/0604016 | Yi Liao | Yi Liao (Nankai Univ) | Active-sterile neutrino mixing in the absence of bare active neutrino
mass | 21 pages, no figures, 2 tables; v2: added the last two refs in item
[17], to appear in NPB | Nucl.Phys. B749 (2006) 153-171 | 10.1016/j.nuclphysb.2006.05.014 | NKHEP 07/2006 | hep-ph | null | We investigate a minimal extension of the standard model in which the only
new ingredient is the sterile neutrinos. We do not introduce extra Higgs
multiplets or high dimensional effective operators to induce mass terms for the
active neutrinos, and the model is renormalizable in itself. We show for
arbitrary numbers of generations and sterile neutrinos that the independent
physical parameters in the leptonic sector are much less than previously
anticipated. For instance, with three active and two sterile neutrinos, there
are four mixing angles and three CP phases in addition to four non-vanishing
neutrino masses. We study phenomenological implications for tritium beta decay,
neutrinoless double beta decay and neutrino oscillations. For the most natural
see-saw parameters, we find that it is difficult to accommodate in the model
the best-fit values of masses and mixing parameters from oscillation data no
matter whether we include or not the null short-baseline experiments together
with the LSND result. This implies that if the LSND result is confirmed by
MiniBooNE, the see-saw parameter region of the model with two sterile neutrinos
could be largely excluded.
| [
{
"created": "Mon, 3 Apr 2006 14:01:52 GMT",
"version": "v1"
},
{
"created": "Thu, 18 May 2006 00:04:34 GMT",
"version": "v2"
}
] | 2009-11-11 | [
[
"Liao",
"Yi",
"",
"Nankai Univ"
]
] | We investigate a minimal extension of the standard model in which the only new ingredient is the sterile neutrinos. We do not introduce extra Higgs multiplets or high dimensional effective operators to induce mass terms for the active neutrinos, and the model is renormalizable in itself. We show for arbitrary numbers of generations and sterile neutrinos that the independent physical parameters in the leptonic sector are much less than previously anticipated. For instance, with three active and two sterile neutrinos, there are four mixing angles and three CP phases in addition to four non-vanishing neutrino masses. We study phenomenological implications for tritium beta decay, neutrinoless double beta decay and neutrino oscillations. For the most natural see-saw parameters, we find that it is difficult to accommodate in the model the best-fit values of masses and mixing parameters from oscillation data no matter whether we include or not the null short-baseline experiments together with the LSND result. This implies that if the LSND result is confirmed by MiniBooNE, the see-saw parameter region of the model with two sterile neutrinos could be largely excluded. |
1003.0231 | Taekoon Lee | Taekoon Lee | Renormalon Subtraction from the Average Plaquette and the Gluon
Condensate | 7pages,one figure; Journal version (added references and introductory
remarks) | Phys.Rev.D82:114021,2010 | 10.1103/PhysRevD.82.114021 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A Borel resummation scheme of subtracting the perturbative contribution from
the average plaquette is proposed using the bilocal expansion of Borel
transform. It is shown that the remnant of the average plaquette, after
subtraction of the perturbative contribution, scales as a dim-4 condensate. A
critical review of the existing procedure of renormalon subtraction is
presented.
| [
{
"created": "Mon, 1 Mar 2010 00:47:04 GMT",
"version": "v1"
},
{
"created": "Mon, 3 Jan 2011 02:52:17 GMT",
"version": "v2"
}
] | 2011-01-17 | [
[
"Lee",
"Taekoon",
""
]
] | A Borel resummation scheme of subtracting the perturbative contribution from the average plaquette is proposed using the bilocal expansion of Borel transform. It is shown that the remnant of the average plaquette, after subtraction of the perturbative contribution, scales as a dim-4 condensate. A critical review of the existing procedure of renormalon subtraction is presented. |
hep-ph/0111184 | Jong-Phil Lee | Jong-Phil Lee (Yonsei Univ.) | CP violating transverse lepton polarizaion in $B\to D^{(*)}\ell\bar\nu$
including tensor interactions | 17 pages, figures and references are added, to appear in Phys. Lett.
B | Phys.Lett. B526 (2002) 61-71 | 10.1016/S0370-2693(01)01492-7 | null | hep-ph | null | We give a model-independent analysis of CP violating lepton polarization in
the exclusive semileptonic B decay of $B\to D^{(*)}\ell\bar\nu$ including
dimension six four-fermion tensor interactions at the heavy quark limit. It is
shown that the tensor interactions should not be neglected if the associated
couplings are comparable to others. The effect of tensor interactions on the
transverse lepton polarization appears more dramatically in $B\to D$ than in
$B\to D^*$. In the leptoquark model, the average transverse lepton polarization
is estimated to be $|\bar{P^\perp_D}|\simeq 0.26$ and
$|\bar{P^\perp_{D^*}}|\simeq 0.076$ with commonly used model parameters.
| [
{
"created": "Thu, 15 Nov 2001 08:07:31 GMT",
"version": "v1"
},
{
"created": "Wed, 21 Nov 2001 06:00:14 GMT",
"version": "v2"
},
{
"created": "Wed, 19 Dec 2001 05:42:13 GMT",
"version": "v3"
}
] | 2009-11-07 | [
[
"Lee",
"Jong-Phil",
"",
"Yonsei Univ."
]
] | We give a model-independent analysis of CP violating lepton polarization in the exclusive semileptonic B decay of $B\to D^{(*)}\ell\bar\nu$ including dimension six four-fermion tensor interactions at the heavy quark limit. It is shown that the tensor interactions should not be neglected if the associated couplings are comparable to others. The effect of tensor interactions on the transverse lepton polarization appears more dramatically in $B\to D$ than in $B\to D^*$. In the leptoquark model, the average transverse lepton polarization is estimated to be $|\bar{P^\perp_D}|\simeq 0.26$ and $|\bar{P^\perp_{D^*}}|\simeq 0.076$ with commonly used model parameters. |
0907.3963 | Felix Yu | Mu-Chun Chen, K.T. Mahanthappa, Felix Yu | A Viable Randall-Sundrum Model for Quarks and Leptons with T' Family
Symmetry | 22 pages, no figures; v2: references added; version to appear in
Phys. Rev. D | Phys.Rev.D81:036004,2010 | 10.1103/PhysRevD.81.036004 | COLO-HEP-550, UCI-TR-2009-12 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We propose a Randall-Sundrum model with a bulk family symmetry based on the
double tetrahedral group, T', which generates the tri-bimaximal neutrino mixing
pattern and a realistic CKM matrix, including CP violation. Unlike 4D models
where the generation of mass hierarchy requires additional symmetry, the warped
geometry naturally gives rise to the fermion mass hierarchy through
wavefunction localization. The T' symmetry forbids tree-level flavor changing
neutral currents in both the quark and lepton sectors, as different generations
of fermions are unified into multiplets of T'. This results in a low first KK
mass scale and thus the model can be tested at collider experiments.
| [
{
"created": "Thu, 23 Jul 2009 00:23:13 GMT",
"version": "v1"
},
{
"created": "Wed, 27 Jan 2010 04:52:29 GMT",
"version": "v2"
}
] | 2014-11-20 | [
[
"Chen",
"Mu-Chun",
""
],
[
"Mahanthappa",
"K. T.",
""
],
[
"Yu",
"Felix",
""
]
] | We propose a Randall-Sundrum model with a bulk family symmetry based on the double tetrahedral group, T', which generates the tri-bimaximal neutrino mixing pattern and a realistic CKM matrix, including CP violation. Unlike 4D models where the generation of mass hierarchy requires additional symmetry, the warped geometry naturally gives rise to the fermion mass hierarchy through wavefunction localization. The T' symmetry forbids tree-level flavor changing neutral currents in both the quark and lepton sectors, as different generations of fermions are unified into multiplets of T'. This results in a low first KK mass scale and thus the model can be tested at collider experiments. |
0803.1022 | Alexander Monin | A. K. Monin, A. V. Zayakin | Semiclassical Treatment of Induced Schwinger Processes at Finite
Temperature | 10 pages, 1 fugure | JETP Lett.87:709-714,2008 | 10.1134/S0021364008110040 | ITEP-TH-07/08 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We consider induced pair production in an external field at finite
temperature. One-loop correction to the Green function of a meson is calculated
semiclassically within the framework of saddle-point analysis of Schwinger
proper time integrals. This correction appears to be exponentially small in
terms of inverse temperature dependence. Low-temperature limit is shown to be
in full agreement with previously obtained zero-temperature results. The
corrections in the low-temperature limits are estimated up to the leading
exponential and pre-exponential terms. Comparison is made to earlier
calculations of vacuum decay.
| [
{
"created": "Fri, 7 Mar 2008 18:56:28 GMT",
"version": "v1"
},
{
"created": "Fri, 14 Mar 2008 17:19:43 GMT",
"version": "v2"
}
] | 2009-02-19 | [
[
"Monin",
"A. K.",
""
],
[
"Zayakin",
"A. V.",
""
]
] | We consider induced pair production in an external field at finite temperature. One-loop correction to the Green function of a meson is calculated semiclassically within the framework of saddle-point analysis of Schwinger proper time integrals. This correction appears to be exponentially small in terms of inverse temperature dependence. Low-temperature limit is shown to be in full agreement with previously obtained zero-temperature results. The corrections in the low-temperature limits are estimated up to the leading exponential and pre-exponential terms. Comparison is made to earlier calculations of vacuum decay. |
hep-ph/0008038 | Marty Stock | R.L. Jaffe | The Theory of the Nucleon Spin | 15 pages, 8 figures, LaTeX using rspublic.cls and BoxedEPS macros; as
submitted to Phil Trans A of the Royal Society for forthcoming volume: The
Quark Structure of Matter; email correspondence to jaffe@mit.edu | Phil.Trans.Roy.Soc.Lond. A359 (2001) 391-404 | 10.1098/rsta.2000.0731 | MIT-CTP-3011 | hep-ph | null | I discuss two topics of current interest in the study of the spin structure
of the nucleon. First, I discuss whether there is a sum rule for the components
of the nucleon's angular moments. Second, I discuss the measurement of the
nucleon's transversity distribution in light of recent results reported by the
HERMES collaboration at DESY.
| [
{
"created": "Thu, 3 Aug 2000 22:37:56 GMT",
"version": "v1"
}
] | 2009-10-31 | [
[
"Jaffe",
"R. L.",
""
]
] | I discuss two topics of current interest in the study of the spin structure of the nucleon. First, I discuss whether there is a sum rule for the components of the nucleon's angular moments. Second, I discuss the measurement of the nucleon's transversity distribution in light of recent results reported by the HERMES collaboration at DESY. |
1209.3622 | Ken Mimasu | L. Basso, K. Mimasu, S.Moretti | Distinguishing Z' models with polarised top pairs | Proceedings submission for parallel talk given at `Rencontres de
Blois' conference, France, June 2012. 5 pages, 1 figure | null | null | preprint SHEP-12-24; FR-PHENO-2012-025 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the sensitivity of top pair production at the Large Hadron Collider
(LHC) to the nature of an underlying Z' boson, including full tree level
standard model background effects and interferences. We demonstrate that
exploiting combinations of asymmetry observables will enable one to distinguish
between a selection of `benchmark' Z' models while assuming realistic final
state reconstruction efficiencies and error estimates.
| [
{
"created": "Mon, 17 Sep 2012 10:39:31 GMT",
"version": "v1"
}
] | 2012-11-26 | [
[
"Basso",
"L.",
""
],
[
"Mimasu",
"K.",
""
],
[
"Moretti",
"S.",
""
]
] | We study the sensitivity of top pair production at the Large Hadron Collider (LHC) to the nature of an underlying Z' boson, including full tree level standard model background effects and interferences. We demonstrate that exploiting combinations of asymmetry observables will enable one to distinguish between a selection of `benchmark' Z' models while assuming realistic final state reconstruction efficiencies and error estimates. |
2301.08615 | En Wang | Yun-He Lyu, Han Zhang, Neng-Chang Wei, Bai-Cian Ke, En Wang, and
Ju-Jun Xie | Photo-production of lowest $\Sigma^*_{1/2^-}$ state within the
Regge-effective Lagrangian approach | 7 pages, 4 figures | null | 10.1088/1674-1137/acc4ab | null | hep-ph nucl-th | http://creativecommons.org/licenses/by/4.0/ | Since the lowest $\Sigma^{*}$ state, with quantum numbers spin-parity $J^{P}
=1/2^{-}$, is far from established experimentally and theoretically, we have
performed a theoretical study on the $\Sigma^*_{1/2^-}$ photo-production within
the Regge-effective Lagrangian approach. Taking into account that the
$\Sigma^*_{1/2^-}$ couples to the $\bar{K}N$ channel, we have considered the
contributions from the $t$-channel $K$ exchange diagram. Moreover, these
contributions from $t$-channel $K^*$ exchange, $s$-channel nucleon pole,
$u$-channel $\Sigma$ exchange, and the contact term, are considered. The
differential and total cross sections of the process $\gamma n \to
K^{+}\Sigma^{*-}_{1/2^-}$ are predicted with our model parameters. The results
should be helpful to search for the $\Sigma^*_{1/2^-}$ state experimentally in
future.
| [
{
"created": "Fri, 20 Jan 2023 14:55:55 GMT",
"version": "v1"
}
] | 2023-04-26 | [
[
"Lyu",
"Yun-He",
""
],
[
"Zhang",
"Han",
""
],
[
"Wei",
"Neng-Chang",
""
],
[
"Ke",
"Bai-Cian",
""
],
[
"Wang",
"En",
""
],
[
"Xie",
"Ju-Jun",
""
]
] | Since the lowest $\Sigma^{*}$ state, with quantum numbers spin-parity $J^{P} =1/2^{-}$, is far from established experimentally and theoretically, we have performed a theoretical study on the $\Sigma^*_{1/2^-}$ photo-production within the Regge-effective Lagrangian approach. Taking into account that the $\Sigma^*_{1/2^-}$ couples to the $\bar{K}N$ channel, we have considered the contributions from the $t$-channel $K$ exchange diagram. Moreover, these contributions from $t$-channel $K^*$ exchange, $s$-channel nucleon pole, $u$-channel $\Sigma$ exchange, and the contact term, are considered. The differential and total cross sections of the process $\gamma n \to K^{+}\Sigma^{*-}_{1/2^-}$ are predicted with our model parameters. The results should be helpful to search for the $\Sigma^*_{1/2^-}$ state experimentally in future. |
1808.03985 | Fanrong Xu | Wei Li, Jiajie Ling, Fanrong Xu, Baobiao Yue | Matter Effect of Light Sterile Neutrino: An Exact Analytical Approach | 17 pages, 8 figures for V1; typos are corrected, accepted by JHEP for
V2 | null | 10.1007/JHEP10(2018)021 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The light sterile neutrino, if it exists, will give additional contribution
to matter effect when active neutrinos propagate through terrestrial matter. In
the simplest 3+1 scheme, three more rotation angles and two more CP-violating
phases in lepton mixing matrix make the interaction complicated formally. In
this work, the exact analytical expressions for active neutrino oscillation
probabilities in terrestrial matter, including sterile neutrino contribution,
are derived. It is pointed out that this set of formulas contain information
both in matter and in vacuum, and can be easily tuned by choosing related
parameters. Based on the generic exact formulas, we present oscillation
probabilities of typic medium and long baseline experiments. Taking NO$\nu$A
experiment as an example, we show that in particular parameter space sterile
neutrino gives important contribution to terrestrial matter effect, and Dirac
phases play a vital role.
| [
{
"created": "Sun, 12 Aug 2018 18:55:17 GMT",
"version": "v1"
},
{
"created": "Wed, 3 Oct 2018 07:14:11 GMT",
"version": "v2"
}
] | 2018-10-17 | [
[
"Li",
"Wei",
""
],
[
"Ling",
"Jiajie",
""
],
[
"Xu",
"Fanrong",
""
],
[
"Yue",
"Baobiao",
""
]
] | The light sterile neutrino, if it exists, will give additional contribution to matter effect when active neutrinos propagate through terrestrial matter. In the simplest 3+1 scheme, three more rotation angles and two more CP-violating phases in lepton mixing matrix make the interaction complicated formally. In this work, the exact analytical expressions for active neutrino oscillation probabilities in terrestrial matter, including sterile neutrino contribution, are derived. It is pointed out that this set of formulas contain information both in matter and in vacuum, and can be easily tuned by choosing related parameters. Based on the generic exact formulas, we present oscillation probabilities of typic medium and long baseline experiments. Taking NO$\nu$A experiment as an example, we show that in particular parameter space sterile neutrino gives important contribution to terrestrial matter effect, and Dirac phases play a vital role. |
1306.2956 | Sven Bjarke Gudnason | Latif Eliaz, Amit Giveon, Sven Bjarke Gudnason, Eitan Tsuk | Mild-split SUSY with flavor | LaTeX, 37 pages, 15 figures; V2: references added, minor corrections
in sec. 6 | JHEP 1310:136,2013 | 10.1007/JHEP10(2013)136 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In the framework of a gauge mediated quiver-like model, the standard model
flavor texture can be naturally generated. The model - like the MSSM - has
furthermore a region in parameter space where the lightest Higgs mass is fed by
heavy stop loops, which in turn sets the average squark mass scale near 10-20
TeV. We perform a careful flavor analysis to check whether this type of
mild-split SUSY passes all flavor constraints as easily as envisioned in the
original type of split SUSY. Interestingly, it turns out to be on the border of
several constraints, in particular, the branching ratio of mu -> e gamma and,
if order one complex phases are assumed, also epsilon_K neutron and electron
EDM. Furthermore, we consider unification as well as dark matter candidates,
especially the gravitino. Finally, we provide a closed-form formula for the
soft masses of matter in arbitrary representations of any of the gauge groups
in a generic quiver-like model with a general messenger sector.
| [
{
"created": "Wed, 12 Jun 2013 20:00:15 GMT",
"version": "v1"
},
{
"created": "Sun, 20 Oct 2013 15:18:34 GMT",
"version": "v2"
}
] | 2013-11-05 | [
[
"Eliaz",
"Latif",
""
],
[
"Giveon",
"Amit",
""
],
[
"Gudnason",
"Sven Bjarke",
""
],
[
"Tsuk",
"Eitan",
""
]
] | In the framework of a gauge mediated quiver-like model, the standard model flavor texture can be naturally generated. The model - like the MSSM - has furthermore a region in parameter space where the lightest Higgs mass is fed by heavy stop loops, which in turn sets the average squark mass scale near 10-20 TeV. We perform a careful flavor analysis to check whether this type of mild-split SUSY passes all flavor constraints as easily as envisioned in the original type of split SUSY. Interestingly, it turns out to be on the border of several constraints, in particular, the branching ratio of mu -> e gamma and, if order one complex phases are assumed, also epsilon_K neutron and electron EDM. Furthermore, we consider unification as well as dark matter candidates, especially the gravitino. Finally, we provide a closed-form formula for the soft masses of matter in arbitrary representations of any of the gauge groups in a generic quiver-like model with a general messenger sector. |
hep-ph/0002125 | Kari Enqvist | Kari Enqvist | Recent progress in Affleck-Dine baryogenesis | 8 pages, 2 figures; invited talk at COSMO99 | null | 10.1142/9789812792129_0059 | HIP-2000-09/TH | hep-ph | null | In the MSSM, cosmological scalar field condensates formed along flat
directions of the scalar potential (Affleck-Dine condensates) are typically
unstable with respect to formation of Q-balls, a type of non-topological
soliton. I discuss the creation and growth of the quantum seed fluctuations
which catalyse the collapse of the condensate. In D-term inflation models, the
fluctuations of squark fields in the flat directions also give rise to
isocurvature density fluctuations stored in the Affleck-Dine condensate. After
the condensate breaks up, these can be perturbations in the baryon number, or,
in the case where the present neutralino density comes directly from B-ball
decay, perturbations in the number of dark matter neutralinos. The latter case
results in a large enhancement of the isocurvature perturbation, which should
be observable by PLANCK.
| [
{
"created": "Fri, 11 Feb 2000 07:49:02 GMT",
"version": "v1"
}
] | 2016-11-03 | [
[
"Enqvist",
"Kari",
""
]
] | In the MSSM, cosmological scalar field condensates formed along flat directions of the scalar potential (Affleck-Dine condensates) are typically unstable with respect to formation of Q-balls, a type of non-topological soliton. I discuss the creation and growth of the quantum seed fluctuations which catalyse the collapse of the condensate. In D-term inflation models, the fluctuations of squark fields in the flat directions also give rise to isocurvature density fluctuations stored in the Affleck-Dine condensate. After the condensate breaks up, these can be perturbations in the baryon number, or, in the case where the present neutralino density comes directly from B-ball decay, perturbations in the number of dark matter neutralinos. The latter case results in a large enhancement of the isocurvature perturbation, which should be observable by PLANCK. |
1602.07691 | Krzysztof Rolbiecki | F. Domingo, S. Heinemeyer, J.S. Kim, K. Rolbiecki | The NMSSM lives: with the 750 GeV diphoton excess | 24 pages, 4 figures; minor text improvements; to appear in EPJC | null | 10.1140/epjc/s10052-016-4080-2 | IFT-UAM/CSIC-16-019 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We propose an NMSSM scenario that can explain the excess in the diphoton
spectrum at 750 GeV recently observed by ATLAS and CMS. We show that in a
certain limit with a very light pseudoscalar one can reproduce the experimental
results without invoking exotic matter. The 750 GeV excess is produced by two
resonant heavy Higgs bosons with masses ~750 GeV, that subsequently decay to
two light pseudoscalars. Each of these decays to collimated photon pairs that
appear as a single photon in the electromagnetic calorimeter. A mass gap
between heavy Higgses mimics a large width of the 750 GeV peak. The production
mechanism, containing a strong component via initial b quarks, ameliorates a
possible tension with 8 TeV data compared to other production modes. We also
discuss other constraints, in particular from low energy experiments. Finally,
we discuss possible methods that could distinguish our proposal from other
physics models describing the diphoton excess in the Run-II of the LHC.
| [
{
"created": "Wed, 24 Feb 2016 21:00:04 GMT",
"version": "v1"
},
{
"created": "Tue, 26 Apr 2016 09:27:37 GMT",
"version": "v2"
}
] | 2016-05-25 | [
[
"Domingo",
"F.",
""
],
[
"Heinemeyer",
"S.",
""
],
[
"Kim",
"J. S.",
""
],
[
"Rolbiecki",
"K.",
""
]
] | We propose an NMSSM scenario that can explain the excess in the diphoton spectrum at 750 GeV recently observed by ATLAS and CMS. We show that in a certain limit with a very light pseudoscalar one can reproduce the experimental results without invoking exotic matter. The 750 GeV excess is produced by two resonant heavy Higgs bosons with masses ~750 GeV, that subsequently decay to two light pseudoscalars. Each of these decays to collimated photon pairs that appear as a single photon in the electromagnetic calorimeter. A mass gap between heavy Higgses mimics a large width of the 750 GeV peak. The production mechanism, containing a strong component via initial b quarks, ameliorates a possible tension with 8 TeV data compared to other production modes. We also discuss other constraints, in particular from low energy experiments. Finally, we discuss possible methods that could distinguish our proposal from other physics models describing the diphoton excess in the Run-II of the LHC. |
2003.08320 | Carlos Alberto Vaquera-Araujo | Ailier Rivero-Acosta and Carlos A. Vaquera-Araujo | Renormalization of a model for spin-1 matter fields | 15 pages, 9 figures | null | 10.1140/epjc/s10052-020-8190-5 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this work, the one-loop renormalization of a theory for fields
transforming in the $(1,0)\oplus(0,1)$ representation of the Homogeneous
Lorentz Group is studied. The model includes an arbitrary gyromagnetic factor
and self-interactions of the spin 1 field, which has mass dimension one. The
model is shown to be renormalizable for any value of the gyromagnetic factor.
| [
{
"created": "Wed, 18 Mar 2020 16:21:47 GMT",
"version": "v1"
},
{
"created": "Tue, 14 Jul 2020 16:10:37 GMT",
"version": "v2"
}
] | 2020-07-15 | [
[
"Rivero-Acosta",
"Ailier",
""
],
[
"Vaquera-Araujo",
"Carlos A.",
""
]
] | In this work, the one-loop renormalization of a theory for fields transforming in the $(1,0)\oplus(0,1)$ representation of the Homogeneous Lorentz Group is studied. The model includes an arbitrary gyromagnetic factor and self-interactions of the spin 1 field, which has mass dimension one. The model is shown to be renormalizable for any value of the gyromagnetic factor. |
1605.07584 | Ismail Zahed | Yizhuang Liu, Edward Shuryak and Ismail Zahed | Light Adjoint Quarks in the Instanton-Dyon Liquid Model IV | 22 pages, 6 figures | Phys. Rev. D 94, 105012 (2016) | 10.1103/PhysRevD.94.105012 | null | hep-ph hep-lat hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We discuss the instanton-dyon liquid model with $N_f$ Majorana quark flavors
in the adjoint representation of color $SU_c(2)$ at finite temperature. We
briefly recall the index theorem on $S^1\times R^3$ for twisted adjoint
fermions in a BPS dyon background of arbitrary holonomy, and use the ADHM
construction to explicit the adjoint anti-periodic zero modes. We use these
results to derive the partition function of an interacting instanton-dyon
ensemble with $N_f$ light and anti-periodic adjoint quarks. We develop the
model in details by mapping the theory on a 3-dimensional quantum effective
theory with adjoint quarks with manifest $SU(N_f)\times Z_{4N_f}$ symmetry.
Using a mean-field analysis at weak coupling and strong screening, we show that
center symmetry requires the spontaneous breaking of chiral symmetry, which is
shown to only take place for $N_f=1$. For a sufficiently dense liquid, we find
that the ground state is center symmetric and breaks spontaneously flavor
symmetry through $SU(N_f)\times Z_{4N_f}\rightarrow O(N_f)$. As the liquid
dilutes with increasing temperature, center symmetry and chiral symmetry are
restored. We present numerical and analytical estimates for the transition
temperatures.
| [
{
"created": "Tue, 24 May 2016 18:58:42 GMT",
"version": "v1"
}
] | 2016-11-23 | [
[
"Liu",
"Yizhuang",
""
],
[
"Shuryak",
"Edward",
""
],
[
"Zahed",
"Ismail",
""
]
] | We discuss the instanton-dyon liquid model with $N_f$ Majorana quark flavors in the adjoint representation of color $SU_c(2)$ at finite temperature. We briefly recall the index theorem on $S^1\times R^3$ for twisted adjoint fermions in a BPS dyon background of arbitrary holonomy, and use the ADHM construction to explicit the adjoint anti-periodic zero modes. We use these results to derive the partition function of an interacting instanton-dyon ensemble with $N_f$ light and anti-periodic adjoint quarks. We develop the model in details by mapping the theory on a 3-dimensional quantum effective theory with adjoint quarks with manifest $SU(N_f)\times Z_{4N_f}$ symmetry. Using a mean-field analysis at weak coupling and strong screening, we show that center symmetry requires the spontaneous breaking of chiral symmetry, which is shown to only take place for $N_f=1$. For a sufficiently dense liquid, we find that the ground state is center symmetric and breaks spontaneously flavor symmetry through $SU(N_f)\times Z_{4N_f}\rightarrow O(N_f)$. As the liquid dilutes with increasing temperature, center symmetry and chiral symmetry are restored. We present numerical and analytical estimates for the transition temperatures. |
1010.1204 | Guy F. de T\'eramond | Guy F. de Teramond and Stanley J. Brodsky | Gauge/Gravity Duality and Strongly Coupled Light-Front Dynamics | Invited talk presented by GdT at Light Cone 2010: Relativistic
Hadronic and Particle Physics, 14-18 June 2010, Valencia, Spain | PoS LC2010:029,2010 | null | SLAC-PUB-14259 | hep-ph hep-lat hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We find a correspondence between semiclassical gauge theories quantized on
the light-front and a dual gravity model in anti-de Sitter (AdS) space, thus
providing an initial approximation to QCD in its strongly coupled regime. This
correspondence -- light-front holography -- leads to a light-front Hamiltonian
and relativistic bound-state wave equations in terms of an invariant impact
variable $\zeta$ which measures the separation of the quark and gluonic
constituents within the hadron at equal light-front time. Light-front
holography also allows a precise mapping of transition amplitudes from AdS to
physical space-time. In contrast with the usual AdS/QCD framework, the internal
structure of hadrons is explicitly introduced in the gauge/gravity
correspondence and the angular momentum of the constituents plays a key role.
We also discuss how to introduce higher Fock-states in the correspondence as
well as their relevance for describing the detailed structure of space and
time-like form factors.
| [
{
"created": "Wed, 6 Oct 2010 16:59:15 GMT",
"version": "v1"
},
{
"created": "Sun, 24 Oct 2010 13:56:43 GMT",
"version": "v2"
}
] | 2011-03-10 | [
[
"de Teramond",
"Guy F.",
""
],
[
"Brodsky",
"Stanley J.",
""
]
] | We find a correspondence between semiclassical gauge theories quantized on the light-front and a dual gravity model in anti-de Sitter (AdS) space, thus providing an initial approximation to QCD in its strongly coupled regime. This correspondence -- light-front holography -- leads to a light-front Hamiltonian and relativistic bound-state wave equations in terms of an invariant impact variable $\zeta$ which measures the separation of the quark and gluonic constituents within the hadron at equal light-front time. Light-front holography also allows a precise mapping of transition amplitudes from AdS to physical space-time. In contrast with the usual AdS/QCD framework, the internal structure of hadrons is explicitly introduced in the gauge/gravity correspondence and the angular momentum of the constituents plays a key role. We also discuss how to introduce higher Fock-states in the correspondence as well as their relevance for describing the detailed structure of space and time-like form factors. |
1106.4347 | Richard F. Lebed | Richard F. Lebed and Van E. Mayes | Gauged Baryon and Lepton Number in MSSM_4 Brane Worlds | 21 pages. Version accepted for publication in Phys. Rev. D | Phys.Rev. D 84: 075016, 2011 | 10.1103/PhysRevD.84.075016 | null | hep-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A recent D-brane model designed to accommodate a phenomenologically
acceptable fourth generation of chiral fermions was noted to produce an
unexpected additional unbroken nonanomalous U(1) gauge group at the string
scale. We show that the corresponding charges acting on MSSM fields count
baryon and lepton numbers. If broken spontaneously at lower scales, these
U(1)_B and U(1)_L symmetries provide potential avenues for preserving
baryogenesis while nonetheless explaining the suppression of proton decay
(without the need for R parity), as well as the smallness of right-handed
neutrino Majorana masses compared to the string scale.
| [
{
"created": "Tue, 21 Jun 2011 22:23:01 GMT",
"version": "v1"
},
{
"created": "Wed, 29 Jun 2011 18:10:35 GMT",
"version": "v2"
},
{
"created": "Tue, 25 Oct 2011 21:45:06 GMT",
"version": "v3"
}
] | 2011-10-27 | [
[
"Lebed",
"Richard F.",
""
],
[
"Mayes",
"Van E.",
""
]
] | A recent D-brane model designed to accommodate a phenomenologically acceptable fourth generation of chiral fermions was noted to produce an unexpected additional unbroken nonanomalous U(1) gauge group at the string scale. We show that the corresponding charges acting on MSSM fields count baryon and lepton numbers. If broken spontaneously at lower scales, these U(1)_B and U(1)_L symmetries provide potential avenues for preserving baryogenesis while nonetheless explaining the suppression of proton decay (without the need for R parity), as well as the smallness of right-handed neutrino Majorana masses compared to the string scale. |
1401.3029 | John W. Moffat | J. W. Moffat | A Composite Model of Quarks and Bosons | 9 pages, no figures | Int. J. Mod. Phys. A, 30, (2015) 1550014 | 10.1142/S0217751X15500141 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A composite model of quarks and bosons is proposed in which a spin $1/2$
isospin doublet $\psi$ is the basic building block of quarks and bosons in the
standard model. The $\psi$ has two components $v$ and $w$ with charges
$Q=\frac{1}{3}e$ and $Q=0$, respectively, that combine to form the three
generations of colored quark flavors. A strong force described by a triplet of
massless gluons bind the constituents called geminis. The confining constituent
non-Abelian $SU(2)_C$ field theory is called constituent dynamics with a
confining energy scale $\Lambda_{CD}$. The constituent dynamics condensate
$\langle\bar{v}v+\bar{w}w\rangle\neq 0$ spontaneously breaks the electroweak
symmetry $SU(2)_L\times U(1)_Y\rightarrow U(1)_{\rm EM}$ and a triplet of
Nambu-Goldstone bosons make the gauge bosons $W^{\pm}$ and $Z^0$ massive, while
retaining a massless photon. A global custodial $SU(2)_L\times SU(2)_R$
symmetry guarantees that the symmetry breaking in the weak interaction sector
agrees with electroweak data. The non-Abelian $SU(2)_C$ color dynamics
satisfies asymptotic freedom, which resolves the gauge and Higgs mass hierarchy
problems and makes the model ultraviolet complete. The composite constituent
dynamics model can realize a $SU(3)_C\times SU(2)_L\times U(1)_Y$ electroweak
and strong interaction model that satisfies the naturalness principle. The
three generations of colorless quarks $\alpha$ and $\beta$ with charges $Q=+1e$
and $Q=0$, respectively, which are predicted to exist in the composite model
can form bound states which can be identified with the spectrum of exotic
mesons.
| [
{
"created": "Mon, 13 Jan 2014 22:31:22 GMT",
"version": "v1"
},
{
"created": "Thu, 23 Jan 2014 21:36:44 GMT",
"version": "v2"
}
] | 2015-02-05 | [
[
"Moffat",
"J. W.",
""
]
] | A composite model of quarks and bosons is proposed in which a spin $1/2$ isospin doublet $\psi$ is the basic building block of quarks and bosons in the standard model. The $\psi$ has two components $v$ and $w$ with charges $Q=\frac{1}{3}e$ and $Q=0$, respectively, that combine to form the three generations of colored quark flavors. A strong force described by a triplet of massless gluons bind the constituents called geminis. The confining constituent non-Abelian $SU(2)_C$ field theory is called constituent dynamics with a confining energy scale $\Lambda_{CD}$. The constituent dynamics condensate $\langle\bar{v}v+\bar{w}w\rangle\neq 0$ spontaneously breaks the electroweak symmetry $SU(2)_L\times U(1)_Y\rightarrow U(1)_{\rm EM}$ and a triplet of Nambu-Goldstone bosons make the gauge bosons $W^{\pm}$ and $Z^0$ massive, while retaining a massless photon. A global custodial $SU(2)_L\times SU(2)_R$ symmetry guarantees that the symmetry breaking in the weak interaction sector agrees with electroweak data. The non-Abelian $SU(2)_C$ color dynamics satisfies asymptotic freedom, which resolves the gauge and Higgs mass hierarchy problems and makes the model ultraviolet complete. The composite constituent dynamics model can realize a $SU(3)_C\times SU(2)_L\times U(1)_Y$ electroweak and strong interaction model that satisfies the naturalness principle. The three generations of colorless quarks $\alpha$ and $\beta$ with charges $Q=+1e$ and $Q=0$, respectively, which are predicted to exist in the composite model can form bound states which can be identified with the spectrum of exotic mesons. |
2104.12213 | P. Divari C. | John D. Vergados, Paraskevi C. Divari, Hiroyasu Ejiri | Calculated event rates for Axion Detection via Atomic and Nuclear
Processes | 28 pages, 17 figures | null | null | null | hep-ph | http://creativecommons.org/licenses/by/4.0/ | The possibility of detection of 5.5 MeV and 14.4 keV solar axions by
observing axion-induced nuclear and atomic transitions is investigated. The
presence of nuclear transitions between spin-orbit partners can be manifested
by the subsequent de-excitation via gamma ray emissions. The transition rates
can also be studied in the context of radiative axion absorption by a nucleus.
The elementary interaction is obtained in the context of the axion-quark
couplings predicted by existing axion models. Then these couplings will be
transformed to the nucleon level utilizing reasonable existing models, which
lead to effective transition operators. Using these operators we calculate the
needed nuclear matrix elements employing wave functions obtained in the context
of the nuclear shell model. With these ingredients, we discuss possibilities of
experimental observation of the axion-induced nuclear gamma-rays. In the second
part, we will examine the axion-induced production of X-rays (axion-photon
conversion) or ionization from deeply bound electron orbits. In this case, the
axion electron coupling is predicted by existing axion models, no
renormalization is needed. The experimental signal is the observation of
directly produced electrons and/or the emission of hard X-rays and Auger
electrons, following the de-excitation of the final atom. Critical discussion
is made on the experimental feasibility of detecting the solar axions by using
multi-ton scale NaI detectors.
| [
{
"created": "Sun, 25 Apr 2021 17:14:08 GMT",
"version": "v1"
},
{
"created": "Sat, 8 May 2021 19:39:55 GMT",
"version": "v2"
},
{
"created": "Fri, 10 Dec 2021 21:24:39 GMT",
"version": "v3"
}
] | 2021-12-14 | [
[
"Vergados",
"John D.",
""
],
[
"Divari",
"Paraskevi C.",
""
],
[
"Ejiri",
"Hiroyasu",
""
]
] | The possibility of detection of 5.5 MeV and 14.4 keV solar axions by observing axion-induced nuclear and atomic transitions is investigated. The presence of nuclear transitions between spin-orbit partners can be manifested by the subsequent de-excitation via gamma ray emissions. The transition rates can also be studied in the context of radiative axion absorption by a nucleus. The elementary interaction is obtained in the context of the axion-quark couplings predicted by existing axion models. Then these couplings will be transformed to the nucleon level utilizing reasonable existing models, which lead to effective transition operators. Using these operators we calculate the needed nuclear matrix elements employing wave functions obtained in the context of the nuclear shell model. With these ingredients, we discuss possibilities of experimental observation of the axion-induced nuclear gamma-rays. In the second part, we will examine the axion-induced production of X-rays (axion-photon conversion) or ionization from deeply bound electron orbits. In this case, the axion electron coupling is predicted by existing axion models, no renormalization is needed. The experimental signal is the observation of directly produced electrons and/or the emission of hard X-rays and Auger electrons, following the de-excitation of the final atom. Critical discussion is made on the experimental feasibility of detecting the solar axions by using multi-ton scale NaI detectors. |
1602.03653 | Kyu Jung Bae | Kyu Jung Bae, Motoi Endo, Koichi Hamaguchi and Takeo Moroi | Diphoton Excess and Running Couplings | 1+17 pages | null | 10.1016/j.physletb.2016.04.031 | UT-16-07, IPMU-16-0015 | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The recently observed diphoton excess at the LHC may suggest the existence of
a singlet (pseudo-) scalar particle with a mass of 750 GeV which couples to
gluons and photons. Assuming that the couplings to gluons and photons originate
from loops of fermions and/or scalars charged under the Standard Model gauge
groups, we show that here is a model-independent upper bound on the cross
section $\sigma(pp\to S\to \gamma\gamma)$ as a function of the cutoff scale
$\Lambda$ and masses of the fermions and scalars in the loop. Such a bound
comes from the fact that the contribution of each particle to the diphoton
event amplitude is proportional to its contribution to the one-loop $\beta$
functions of the gauge couplings. We also investigate the perturbativity of
running Yukawa couplings in models with fermion loops, and show the upper
bounds on $\sigma(pp\to S\to \gamma\gamma)$ for explicit models.
| [
{
"created": "Thu, 11 Feb 2016 09:41:28 GMT",
"version": "v1"
}
] | 2016-05-04 | [
[
"Bae",
"Kyu Jung",
""
],
[
"Endo",
"Motoi",
""
],
[
"Hamaguchi",
"Koichi",
""
],
[
"Moroi",
"Takeo",
""
]
] | The recently observed diphoton excess at the LHC may suggest the existence of a singlet (pseudo-) scalar particle with a mass of 750 GeV which couples to gluons and photons. Assuming that the couplings to gluons and photons originate from loops of fermions and/or scalars charged under the Standard Model gauge groups, we show that here is a model-independent upper bound on the cross section $\sigma(pp\to S\to \gamma\gamma)$ as a function of the cutoff scale $\Lambda$ and masses of the fermions and scalars in the loop. Such a bound comes from the fact that the contribution of each particle to the diphoton event amplitude is proportional to its contribution to the one-loop $\beta$ functions of the gauge couplings. We also investigate the perturbativity of running Yukawa couplings in models with fermion loops, and show the upper bounds on $\sigma(pp\to S\to \gamma\gamma)$ for explicit models. |
1504.00574 | Konstantinos Alexandros Petridis | Ulrik Egede, Mitesh Patel, Konstantinos A. Petridis | Method for an unbinned measurement of the $q^2$ dependent decay
amplitudes of $\bar{B}^{0}\to \bar{K}^{*0}\mu^+\mu^-$ decays | 24 pages, 9 figures | JHEP 06 (2015) 084 | 10.1007/JHEP06(2015)084 | null | hep-ph hep-ex | http://creativecommons.org/licenses/by/3.0/ | A method for determining the $q^2$ dependent $\bar{K}^{*0}$ spin amplitudes
of $\bar{B}^{0}\to \bar{K}^{*0}\mu^+\mu^-$ decays through a maximum likelihood
fit to data is presented. While current experimental techniques extract a
limited set of observables in bins of $q^2$, our approach allows for the
determination of all observable quantities as continuous distributions in
$q^2$. By doing this, the method eliminates the need to correct theory
predictions of these observables for $q^2$ averaging effects, thus increasing
the sensitivity to the effects of physics beyond the Standard Model. Accounting
for the symmetries of the angular distribution and using a three parameter
ansatz for the $q^2$ dependence of the amplitudes, the precision of the angular
observables and the sensitivity to new physics is estimated using simulated
events. These studies are based on the sample sizes collected by the LHCb
experiment during Run-I and expected for Run-II.
| [
{
"created": "Thu, 2 Apr 2015 14:42:41 GMT",
"version": "v1"
},
{
"created": "Thu, 25 Jun 2015 17:19:26 GMT",
"version": "v2"
}
] | 2015-06-26 | [
[
"Egede",
"Ulrik",
""
],
[
"Patel",
"Mitesh",
""
],
[
"Petridis",
"Konstantinos A.",
""
]
] | A method for determining the $q^2$ dependent $\bar{K}^{*0}$ spin amplitudes of $\bar{B}^{0}\to \bar{K}^{*0}\mu^+\mu^-$ decays through a maximum likelihood fit to data is presented. While current experimental techniques extract a limited set of observables in bins of $q^2$, our approach allows for the determination of all observable quantities as continuous distributions in $q^2$. By doing this, the method eliminates the need to correct theory predictions of these observables for $q^2$ averaging effects, thus increasing the sensitivity to the effects of physics beyond the Standard Model. Accounting for the symmetries of the angular distribution and using a three parameter ansatz for the $q^2$ dependence of the amplitudes, the precision of the angular observables and the sensitivity to new physics is estimated using simulated events. These studies are based on the sample sizes collected by the LHCb experiment during Run-I and expected for Run-II. |
hep-ph/9311236 | Edmond Iancu | Edmond Iancu | Soft Fields and Hard Particles in Hot Gauge Plasmas | Talk given at the 3rd Workshop on Thermal Field Theories and their
Applications, Aug. 93, Banff, Canada; 7 pages; SACLAY-T93/122 | null | null | null | hep-ph | null | It is shown that the long wavelength excitations of a quark-gluon plasma may
be described as collective oscillations of self-consistent average fields to
which the plasma particles couple. Their properties are obtained from a set of
coupled mean field and kinetic equations, derived from the general
Dyson-Schwinger equations, as the leading order in a systematic expansion in
powers of the coupling. By solving the kinetic equations, one obtains in closed
form the generating functionals for all the leading order amplitudes between
soft quasiparticles, the so-called ``hard thermal loops''.
| [
{
"created": "Mon, 8 Nov 1993 03:46:56 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Iancu",
"Edmond",
""
]
] | It is shown that the long wavelength excitations of a quark-gluon plasma may be described as collective oscillations of self-consistent average fields to which the plasma particles couple. Their properties are obtained from a set of coupled mean field and kinetic equations, derived from the general Dyson-Schwinger equations, as the leading order in a systematic expansion in powers of the coupling. By solving the kinetic equations, one obtains in closed form the generating functionals for all the leading order amplitudes between soft quasiparticles, the so-called ``hard thermal loops''. |
2011.04821 | Ke-Pan Xie | Ke-Pan Xie | Lepton-mediated electroweak baryogenesis, gravitational waves and the
$4\tau$ final state at the collider | 21 pages, 4 figures and 1 table. Formulae in the appendix corrected;
main conclusions unchanged | null | 10.1007/JHEP02(2021)090 | null | hep-ph astro-ph.CO | http://creativecommons.org/licenses/by/4.0/ | An electroweak baryogenesis (EWBG) mechanism mediated by $\tau$ lepton
transport is proposed. We extend the Standard Model with a real singlet scalar
$S$ to trigger the strong first-order electroweak phase transition (SFOEWPT),
and with a set of leptophilic dimension-5 operators to provide sufficient CP
violating source. We demonstrate this model is able to generate the observed
baryon asymmetry of the universe. This scenario is experimentally testable via
either the SFOEWPT gravitational wave signals at the next-generation
space-based detectors, or the $pp\to h^*\to SS\to 4\tau$ process (where $h^*$
is an off-shell Higgs) at the hadron colliders. A detailed collider simulation
shows that a considerable fraction of parameter space can be probed at the
HL-LHC, while almost the whole parameter space allowed by EWBG can be reached
by the 27 TeV HE-LHC.
| [
{
"created": "Mon, 9 Nov 2020 23:16:31 GMT",
"version": "v1"
},
{
"created": "Mon, 25 Jan 2021 23:22:00 GMT",
"version": "v2"
},
{
"created": "Sat, 12 Jun 2021 04:52:50 GMT",
"version": "v3"
},
{
"created": "Wed, 16 Jun 2021 23:48:35 GMT",
"version": "v4"
}
] | 2021-06-18 | [
[
"Xie",
"Ke-Pan",
""
]
] | An electroweak baryogenesis (EWBG) mechanism mediated by $\tau$ lepton transport is proposed. We extend the Standard Model with a real singlet scalar $S$ to trigger the strong first-order electroweak phase transition (SFOEWPT), and with a set of leptophilic dimension-5 operators to provide sufficient CP violating source. We demonstrate this model is able to generate the observed baryon asymmetry of the universe. This scenario is experimentally testable via either the SFOEWPT gravitational wave signals at the next-generation space-based detectors, or the $pp\to h^*\to SS\to 4\tau$ process (where $h^*$ is an off-shell Higgs) at the hadron colliders. A detailed collider simulation shows that a considerable fraction of parameter space can be probed at the HL-LHC, while almost the whole parameter space allowed by EWBG can be reached by the 27 TeV HE-LHC. |
1806.01712 | Chul Kim | Junegone Chay, Chul Kim | Factorized groomed jet mass distribution in inclusive jet processes | 31 pages, 8 figures | null | 10.3938/jkps.74.439 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We consider the factorized groomed jet mass distribution in inclusive jet
processes using modified mass drop tagger (mMDT), corresponding to soft drop
with the angular exponent $\beta =0$. A grooming procedure is implemented
rather than tagging in the sense that grooming always returns a groomed jet,
while tagging dose not return a jet when a single particle remains after
tagging. We find that the grooming procedure makes the jet mass distribution
infrared safe and only ultraviolet divergences appear in each factorized part.
The groomed jet mass distributions are investigated in a wide range of the jet
mass considering various limits on the jet mass variable $\rho =
M_J^2/(p_T^JR)^2$ and the grooming cut $y_c$. Appropriate effective theories in
different kinematic regions are employed to resum large logarithms, in which
the analysis in the region $\rho \sim y_c \ll 1$ is included due to the
different type of factorization. The analytic computation of the factorized
groomed jet mass distribution is presented by resumming the large logarithms in
the jet mass, and $y_c$. Numerically, the effect of the resummation is notably
enhanced, compared with the calculation at next-to-leading order, and nonglobal
logarithms are estimated to be small.
| [
{
"created": "Tue, 5 Jun 2018 14:25:10 GMT",
"version": "v1"
}
] | 2019-03-27 | [
[
"Chay",
"Junegone",
""
],
[
"Kim",
"Chul",
""
]
] | We consider the factorized groomed jet mass distribution in inclusive jet processes using modified mass drop tagger (mMDT), corresponding to soft drop with the angular exponent $\beta =0$. A grooming procedure is implemented rather than tagging in the sense that grooming always returns a groomed jet, while tagging dose not return a jet when a single particle remains after tagging. We find that the grooming procedure makes the jet mass distribution infrared safe and only ultraviolet divergences appear in each factorized part. The groomed jet mass distributions are investigated in a wide range of the jet mass considering various limits on the jet mass variable $\rho = M_J^2/(p_T^JR)^2$ and the grooming cut $y_c$. Appropriate effective theories in different kinematic regions are employed to resum large logarithms, in which the analysis in the region $\rho \sim y_c \ll 1$ is included due to the different type of factorization. The analytic computation of the factorized groomed jet mass distribution is presented by resumming the large logarithms in the jet mass, and $y_c$. Numerically, the effect of the resummation is notably enhanced, compared with the calculation at next-to-leading order, and nonglobal logarithms are estimated to be small. |
1205.6525 | David McKeen | David McKeen, Maxim Pospelov | Testing Parity with Atomic Radiative Capture of $\mu^-$ | To appear in PRL | Phys.Rev.Lett.108:263401,2012 | 10.1103/PhysRevLett.108.263401 | null | hep-ph hep-ex nucl-ex nucl-th physics.atom-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The next generation of "intensity frontier" facilities will bring a
significant increase in the intensity of sub-relativistic beams of $\mu^-$. We
show that the use of these beams in combination with thin targets of $Z\sim 30$
elements opens up the possibility of testing parity-violating interactions of
muons with nuclei via direct radiative capture of muons into atomic 2S
orbitals. Since atomic capture preserves longitudinal muon polarization, the
measurement of the gamma ray angular asymmetry in the single photon
$2S_{1/2}$-$1S_{1/2}$ transition will offer a direct test of parity. We
calculate the probability of atomic radiative capture taking into account the
finite size of the nucleus to show that this process can dominate over the
usual muonic atom cascade, and that the as yet unobserved single photon
$2S_{1/2}$-$1S_{1/2}$ transition in muonic atoms can be detected in this way
using current muon facilities.
| [
{
"created": "Wed, 30 May 2012 01:31:34 GMT",
"version": "v1"
}
] | 2012-07-03 | [
[
"McKeen",
"David",
""
],
[
"Pospelov",
"Maxim",
""
]
] | The next generation of "intensity frontier" facilities will bring a significant increase in the intensity of sub-relativistic beams of $\mu^-$. We show that the use of these beams in combination with thin targets of $Z\sim 30$ elements opens up the possibility of testing parity-violating interactions of muons with nuclei via direct radiative capture of muons into atomic 2S orbitals. Since atomic capture preserves longitudinal muon polarization, the measurement of the gamma ray angular asymmetry in the single photon $2S_{1/2}$-$1S_{1/2}$ transition will offer a direct test of parity. We calculate the probability of atomic radiative capture taking into account the finite size of the nucleus to show that this process can dominate over the usual muonic atom cascade, and that the as yet unobserved single photon $2S_{1/2}$-$1S_{1/2}$ transition in muonic atoms can be detected in this way using current muon facilities. |
1502.03725 | Naoya Kitajima | Naoya Kitajima, Fuminobu Takahashi | Gravitational waves from Higgs domain walls | 15 pages, 3 figures; v2: title changed, comments and references
added; v3: accepted for publication in PLB | Phys.Lett. B745 (2015) 112-117 | 10.1016/j.physletb.2015.04.040 | TU-991, IPMU15-0016 | hep-ph astro-ph.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The effective potential for the Standard Model Higgs field allows two
quasi-degenerate vacua; one is our vacuum at the electroweak scale, while the
other is at a much higher scale. The latter minimum may be at a scale much
smaller than the Planck scale, if the potential is lifted by new physics. This
gives rise to a possibility of domain wall formation after inflation. If the
high-scale minimum is a local minimum, domain walls are unstable and disappear
through violent annihilation processes, producing a significant amount of
gravitational waves. We estimate the amount of gravitational waves produced
from unstable domain walls in the Higgs potential and discuss detectability
with future experiments.
| [
{
"created": "Thu, 12 Feb 2015 16:45:14 GMT",
"version": "v1"
},
{
"created": "Tue, 24 Feb 2015 07:12:34 GMT",
"version": "v2"
},
{
"created": "Thu, 7 May 2015 08:27:07 GMT",
"version": "v3"
}
] | 2015-05-08 | [
[
"Kitajima",
"Naoya",
""
],
[
"Takahashi",
"Fuminobu",
""
]
] | The effective potential for the Standard Model Higgs field allows two quasi-degenerate vacua; one is our vacuum at the electroweak scale, while the other is at a much higher scale. The latter minimum may be at a scale much smaller than the Planck scale, if the potential is lifted by new physics. This gives rise to a possibility of domain wall formation after inflation. If the high-scale minimum is a local minimum, domain walls are unstable and disappear through violent annihilation processes, producing a significant amount of gravitational waves. We estimate the amount of gravitational waves produced from unstable domain walls in the Higgs potential and discuss detectability with future experiments. |
1302.0703 | Juan Nieves Dr. | J. Nieves, I. Ruiz Simo and M.J. Vicente Vacas | Two Particle-Hole Excitations in Charged Current Quasielastic
Antineutrino--Nucleus Scattering | 6 pages, 4 figures | null | 10.1016/j.physletb.2013.03.002 | null | hep-ph nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We evaluate the quasielastic and multinucleon contributions to the
antineutrino nucleus scattering cross section and compare our results with the
recent MiniBooNE data. We use a local Fermi gas model that includes RPA
correlations and gets the multinucleon part from a systematic many body
expansion of the $W$ boson selfenergy in the nuclear medium. The same model had
been quite successful for the neutrino cross section and contains no new
parameters. We have also analysed the relevance of 2p2h events for the
antineutrino energy reconstruction.
| [
{
"created": "Mon, 4 Feb 2013 14:28:18 GMT",
"version": "v1"
}
] | 2015-06-12 | [
[
"Nieves",
"J.",
""
],
[
"Simo",
"I. Ruiz",
""
],
[
"Vacas",
"M. J. Vicente",
""
]
] | We evaluate the quasielastic and multinucleon contributions to the antineutrino nucleus scattering cross section and compare our results with the recent MiniBooNE data. We use a local Fermi gas model that includes RPA correlations and gets the multinucleon part from a systematic many body expansion of the $W$ boson selfenergy in the nuclear medium. The same model had been quite successful for the neutrino cross section and contains no new parameters. We have also analysed the relevance of 2p2h events for the antineutrino energy reconstruction. |
1009.1878 | Bin He | Bin He, Nobuchika Okada and Qaisar Shafi | Higgs Boson Mass Bounds in Seesaw Extended Standard Model with
Non-Minimal Gravitational Coupling | 16 pages, 8 figures; added references | Phys.Lett.B695:219-224,2011 | 10.1016/j.physletb.2010.11.020 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In the presence of non-minimal gravitational coupling $ \xi H^\dagger H {\cal
R}$ between the standard model (SM) Higgs doublet $H$ and the curvature scalar
${\cal R}$, the effective ultraviolet cutoff scale is given by $\Lambda_{\rm
cut}\approx m_P/\xi$, where $m_P$ is the reduced Planck mass, and $\xi \gtrsim
1$ is a dimensionless coupling constant. In type I and type III seesaw extended
SM, which can naturally explain the observed solar and atmospheric neutrino
oscillations, we investigate the implications of this non-minimal gravitational
coupling for the SM Higgs boson mass bounds based on vacuum stability and
perturbativity arguments. A lower bound on the Higgs boson mass close to 120
GeV is realized with type III seesaw and $\xi \sim 10-10^3$.
| [
{
"created": "Thu, 9 Sep 2010 20:10:51 GMT",
"version": "v1"
},
{
"created": "Wed, 22 Sep 2010 21:23:06 GMT",
"version": "v2"
}
] | 2011-05-12 | [
[
"He",
"Bin",
""
],
[
"Okada",
"Nobuchika",
""
],
[
"Shafi",
"Qaisar",
""
]
] | In the presence of non-minimal gravitational coupling $ \xi H^\dagger H {\cal R}$ between the standard model (SM) Higgs doublet $H$ and the curvature scalar ${\cal R}$, the effective ultraviolet cutoff scale is given by $\Lambda_{\rm cut}\approx m_P/\xi$, where $m_P$ is the reduced Planck mass, and $\xi \gtrsim 1$ is a dimensionless coupling constant. In type I and type III seesaw extended SM, which can naturally explain the observed solar and atmospheric neutrino oscillations, we investigate the implications of this non-minimal gravitational coupling for the SM Higgs boson mass bounds based on vacuum stability and perturbativity arguments. A lower bound on the Higgs boson mass close to 120 GeV is realized with type III seesaw and $\xi \sim 10-10^3$. |
hep-ph/0009042 | Olivier Leitner | X.-H. Guo, O. Leitner, A.W. Thomas | Enhanced Direct CP Violation in $B^{\pm} \to \rho^{0} \pi^{\pm}$ | 37 pages, 7 figures | Phys.Rev.D63:056012,2001 | 10.1103/PhysRevD.63.056012 | ADP-00-44/T427, PCCF-RI-0018 | hep-ph | null | We study direct CP violation in the hadronic decay $B^{\pm} \to
\rho^{0}\pi^{\pm}$, including the effect of $\rho - \omega$ mixing. We find
that the CP violating asymmetry is strongly dependent on the CKM matrix
elements, especially the Wolfenstein parameter $\eta$. For fixed $N_{c}$ (the
effective parameter associated with factorization), the CP violating asymmetry,
$a$, has a maximum of order $30%-50%$ when the invariant mass of the
$\pi^{+}\pi^{-}$ pair is in the vicinity of the $\omega$ resonance. The
sensitivity of the asymmetry, $a$, to $N_{c}$ is small. Moreover, if $N_{c}$ is
constrained using the latest experimental branching ratios from the CLEO
collaboration, we find that the sign of $\sin \delta$ is always positive. Thus,
a measurement of direct CP violation in $B^{\pm} \to \rho^{0}\pi^{\pm}$ would
remove the mod$(\pi)$ ambiguity in ${\rm arg}[ -
\frac{V_{td}V_{tb}^{\star}}{V_{ud}V_{ub}^{\star}}]$.
| [
{
"created": "Tue, 5 Sep 2000 00:19:01 GMT",
"version": "v1"
}
] | 2010-02-17 | [
[
"Guo",
"X. -H.",
""
],
[
"Leitner",
"O.",
""
],
[
"Thomas",
"A. W.",
""
]
] | We study direct CP violation in the hadronic decay $B^{\pm} \to \rho^{0}\pi^{\pm}$, including the effect of $\rho - \omega$ mixing. We find that the CP violating asymmetry is strongly dependent on the CKM matrix elements, especially the Wolfenstein parameter $\eta$. For fixed $N_{c}$ (the effective parameter associated with factorization), the CP violating asymmetry, $a$, has a maximum of order $30%-50%$ when the invariant mass of the $\pi^{+}\pi^{-}$ pair is in the vicinity of the $\omega$ resonance. The sensitivity of the asymmetry, $a$, to $N_{c}$ is small. Moreover, if $N_{c}$ is constrained using the latest experimental branching ratios from the CLEO collaboration, we find that the sign of $\sin \delta$ is always positive. Thus, a measurement of direct CP violation in $B^{\pm} \to \rho^{0}\pi^{\pm}$ would remove the mod$(\pi)$ ambiguity in ${\rm arg}[ - \frac{V_{td}V_{tb}^{\star}}{V_{ud}V_{ub}^{\star}}]$. |
2205.06669 | Nico Benincasa | Nico Benincasa, Luigi Delle Rose, Kristjan Kannike, Luca Marzola | Multi-step phase transitions and gravitational waves in the inert
doublet model | 27 pages, 17 figures. Version accepted by JCAP | null | 10.1088/1475-7516/2022/12/025 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The inert doublet model is a well-motivated extension of the Standard Model
that contains a dark matter candidate and modifies the dynamics of the
electroweak symmetry breaking. In order to detail its phenomenology, we perform
a comprehensive study of cosmic phase transitions and gravitational wave
signals implied by the framework, accounting for the latest results of collider
experiments. We require the neutral inert scalar to constitute, at least, a
subdominant part of the observed dark matter abundance. While most of the phase
transitions proceed through a single step, we identify regions of the parameter
space where the electroweak vacuum is reached after multiple phase transitions.
The resulting gravitational wave spectrum is generally dominated by single-step
transitions and, in part of the parameter space, falls within the reach of
future gravitational wave detectors such as LISA, BBO or DECIGO. We find that
direct detection experiments efficiently probe the part of parameter space
associated with multi-step phase transitions, which remain unconstrained only
in the Higgs resonance region testable with future monojet searches. The
implications of the new determination of the $W$ boson mass are also discussed.
| [
{
"created": "Fri, 13 May 2022 14:20:14 GMT",
"version": "v1"
},
{
"created": "Thu, 15 Dec 2022 13:21:12 GMT",
"version": "v2"
}
] | 2022-12-28 | [
[
"Benincasa",
"Nico",
""
],
[
"Rose",
"Luigi Delle",
""
],
[
"Kannike",
"Kristjan",
""
],
[
"Marzola",
"Luca",
""
]
] | The inert doublet model is a well-motivated extension of the Standard Model that contains a dark matter candidate and modifies the dynamics of the electroweak symmetry breaking. In order to detail its phenomenology, we perform a comprehensive study of cosmic phase transitions and gravitational wave signals implied by the framework, accounting for the latest results of collider experiments. We require the neutral inert scalar to constitute, at least, a subdominant part of the observed dark matter abundance. While most of the phase transitions proceed through a single step, we identify regions of the parameter space where the electroweak vacuum is reached after multiple phase transitions. The resulting gravitational wave spectrum is generally dominated by single-step transitions and, in part of the parameter space, falls within the reach of future gravitational wave detectors such as LISA, BBO or DECIGO. We find that direct detection experiments efficiently probe the part of parameter space associated with multi-step phase transitions, which remain unconstrained only in the Higgs resonance region testable with future monojet searches. The implications of the new determination of the $W$ boson mass are also discussed. |
1705.05358 | Chang-Hun Lee | Chang-Hun Lee | Construction of lepton mass matrices and TeV-scale phenomenology in the
minimal left-right symmetric model | null | null | null | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We develop a systematic procedure of constructing lepton mass matrices that
satisfy all the experimental constraints in the light lepton sector of the
minimal left-right symmetric model with type-I seesaw dominance. This method is
unique since it is applicable to the most general cases of type-I seesaw with
complex electroweak vacuum expectation values in the model. With this method,
we investigate the TeV-scale phenomenology in the normal hierarchy without
fine-tuning of model parameters, focusing on the charged lepton flavour
violation, neutrinoless double beta decay, and electric dipole moments of
charged leptons. We examine the predictions for typical ranges of associated
observables such as branching ratios of rare lepton decays, and study how those
experimental constraints affect the model parameter space. The most notable
result is that the regions of parameter space that allow small light neutrino
masses have been constrained by the present experimental bounds from charged
lepton flavour violation. Furthermore, we also find that the mass of the
lightest heavy neutrino should be relatively small in order to satisfy those
experimental constraints.
| [
{
"created": "Mon, 15 May 2017 17:53:17 GMT",
"version": "v1"
},
{
"created": "Tue, 6 Jun 2017 21:13:48 GMT",
"version": "v2"
}
] | 2017-06-08 | [
[
"Lee",
"Chang-Hun",
""
]
] | We develop a systematic procedure of constructing lepton mass matrices that satisfy all the experimental constraints in the light lepton sector of the minimal left-right symmetric model with type-I seesaw dominance. This method is unique since it is applicable to the most general cases of type-I seesaw with complex electroweak vacuum expectation values in the model. With this method, we investigate the TeV-scale phenomenology in the normal hierarchy without fine-tuning of model parameters, focusing on the charged lepton flavour violation, neutrinoless double beta decay, and electric dipole moments of charged leptons. We examine the predictions for typical ranges of associated observables such as branching ratios of rare lepton decays, and study how those experimental constraints affect the model parameter space. The most notable result is that the regions of parameter space that allow small light neutrino masses have been constrained by the present experimental bounds from charged lepton flavour violation. Furthermore, we also find that the mass of the lightest heavy neutrino should be relatively small in order to satisfy those experimental constraints. |
2110.03714 | Davide Pagani | Davide Pagani, Marco Zaro | One-loop electroweak Sudakov logarithms: a revisitation and automation | 57 pages, 8 figures, 2 tables. This version matches the one published | JHEP 02 (2022) 161 | 10.1007/JHEP02(2022)161 | DESY-21-145, TIF-UNIMI-2021-13 | hep-ph hep-ex | http://creativecommons.org/licenses/by/4.0/ | In this work we revisit the algorithm of Denner and Pozzorini for the
calculation of one-loop electroweak Sudakov logarithms and we automate it in
the MadGraph5_aMC@NLO framework. We adapt the formulas for modern calculations,
keeping light-quarks and photons strictly massless and dealing with infrared
divergences via dimensional regularisation. We improve the approximation by
taking into account additional logarithms that are angular dependent. We prove
that an imaginary term has been previously omitted and we show that it cannot
be in general neglected for $2\rightarrow n$ processes with $n> 2$. We extend
the algorithm to NLO EW corrections to squared matrix-elements that involve
also QCD corrections on top of subleading LO terms. Furthermore, we discuss the
usage of this algorithm for approximating physical observables and cross
sections. We propose a new approach in which the QED component is consistently
removed and we show how it can be superior to the commonly used approaches. The
relevance of all the novelties introduced in this work is corroborated by
numerical results obtained for several processes in a completely automated way.
We thoroughly compare exact NLO EW corrections and their Sudakov approximations
both at the amplitude level and for physical observables in high-energy
hadronic collisions.
| [
{
"created": "Thu, 7 Oct 2021 18:03:41 GMT",
"version": "v1"
},
{
"created": "Wed, 20 Apr 2022 16:27:02 GMT",
"version": "v2"
}
] | 2022-04-21 | [
[
"Pagani",
"Davide",
""
],
[
"Zaro",
"Marco",
""
]
] | In this work we revisit the algorithm of Denner and Pozzorini for the calculation of one-loop electroweak Sudakov logarithms and we automate it in the MadGraph5_aMC@NLO framework. We adapt the formulas for modern calculations, keeping light-quarks and photons strictly massless and dealing with infrared divergences via dimensional regularisation. We improve the approximation by taking into account additional logarithms that are angular dependent. We prove that an imaginary term has been previously omitted and we show that it cannot be in general neglected for $2\rightarrow n$ processes with $n> 2$. We extend the algorithm to NLO EW corrections to squared matrix-elements that involve also QCD corrections on top of subleading LO terms. Furthermore, we discuss the usage of this algorithm for approximating physical observables and cross sections. We propose a new approach in which the QED component is consistently removed and we show how it can be superior to the commonly used approaches. The relevance of all the novelties introduced in this work is corroborated by numerical results obtained for several processes in a completely automated way. We thoroughly compare exact NLO EW corrections and their Sudakov approximations both at the amplitude level and for physical observables in high-energy hadronic collisions. |
hep-ph/0502111 | Evgeni Andriyash | E.A.Andriyash, G.G.Ovanesyan, M.I.Vysotsky | The value of B_K from the experimental data on CP-violation in K-mesons
and up-to-date values of CKM matrix parameters | 12 pages, 1 figure | Phys.Atom.Nucl. 69 (2006) 286-292 | 10.1134/S106377880602013X | null | hep-ph | null | The difference between induced by box diagram quantity \tilde \epsilon and
experimentally measured value of \epsilon is determined and used to obtain the
value of \tilde \epsilon with high precision. Present day knowledge of CKM
matrix elements (including B-factory data), allows us to obtain from the
Standard Model expression for \tilde \epsilon the value of parameter B_K: B_K =
0.89 \pm0.16. It turns out to be very close to the result of vacuum insertion,
B_K = 1.
| [
{
"created": "Fri, 11 Feb 2005 13:43:00 GMT",
"version": "v1"
}
] | 2009-11-11 | [
[
"Andriyash",
"E. A.",
""
],
[
"Ovanesyan",
"G. G.",
""
],
[
"Vysotsky",
"M. I.",
""
]
] | The difference between induced by box diagram quantity \tilde \epsilon and experimentally measured value of \epsilon is determined and used to obtain the value of \tilde \epsilon with high precision. Present day knowledge of CKM matrix elements (including B-factory data), allows us to obtain from the Standard Model expression for \tilde \epsilon the value of parameter B_K: B_K = 0.89 \pm0.16. It turns out to be very close to the result of vacuum insertion, B_K = 1. |
1503.00599 | Maria Eugenia Cabrera Catalan | Maria Eugenia Cabrera Catalan, Shin'ichiro Ando, Christoph Weniger and
Fabio Zandanel | Indirect and direct detection prospect for TeV dark matter in the MSSM-9 | 8 pages, 3 figures | Phys. Rev. D 92, 035018 (2015) | 10.1103/PhysRevD.92.035018 | null | hep-ph astro-ph.CO astro-ph.HE | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We investigate the prospects of indirect and direct dark matter searches
within the minimal supersymmetric standard model with nine parameters (MSSM-9).
These nine parameters include three gaugino masses, Higgs, slepton and squark
masses, all treated independently. We perform a Bayesian Monte Carlo scan of
the parameter space taking into consideration all available particle physics
constraints such as the Higgs mass of 126 GeV, upper limits on the scattering
cross-section from direct-detection experiments, and assuming that the MSSM-9
provides all the dark matter abundance through thermal freeze-out mechanism.
Within this framework we find two most probable regions for dark matter: 1-TeV
higgsino-like and 3-TeV wino-like neutralinos. We discuss prospects for future
indirect (in particular the Cherenkov Telescope Array, CTA) and direct
detection experiments. We find that for slightly contracted dark matter
profiles in our Galaxy, which can be caused by the effects of baryonic infall
in the Galactic center, CTA will be able to probe a large fraction of the
remaining allowed region in synergy with future direct detection experiments
like XENON-1T.
| [
{
"created": "Mon, 2 Mar 2015 16:33:19 GMT",
"version": "v1"
},
{
"created": "Fri, 9 Oct 2015 21:54:01 GMT",
"version": "v2"
}
] | 2015-10-13 | [
[
"Catalan",
"Maria Eugenia Cabrera",
""
],
[
"Ando",
"Shin'ichiro",
""
],
[
"Weniger",
"Christoph",
""
],
[
"Zandanel",
"Fabio",
""
]
] | We investigate the prospects of indirect and direct dark matter searches within the minimal supersymmetric standard model with nine parameters (MSSM-9). These nine parameters include three gaugino masses, Higgs, slepton and squark masses, all treated independently. We perform a Bayesian Monte Carlo scan of the parameter space taking into consideration all available particle physics constraints such as the Higgs mass of 126 GeV, upper limits on the scattering cross-section from direct-detection experiments, and assuming that the MSSM-9 provides all the dark matter abundance through thermal freeze-out mechanism. Within this framework we find two most probable regions for dark matter: 1-TeV higgsino-like and 3-TeV wino-like neutralinos. We discuss prospects for future indirect (in particular the Cherenkov Telescope Array, CTA) and direct detection experiments. We find that for slightly contracted dark matter profiles in our Galaxy, which can be caused by the effects of baryonic infall in the Galactic center, CTA will be able to probe a large fraction of the remaining allowed region in synergy with future direct detection experiments like XENON-1T. |
hep-ph/9805511 | Otto Kong | Otto C. W. Kong (Rochester U.), Feng-Li Lin (Virginia Tech.) | Two-Higgs-Doublet-Models and Radiative CP Violation | 8 pages + cover, 3 figures incoporated, in latex with aipproc.sty
/aipproc.cls, talk given by O.K. at MRST '98 | null | 10.1063/1.57065 | UR-1531, ER/40685/918, VPI-IPPAP-98-2 | hep-ph | null | We discuss the feasibility of spontaneous CP violation being induced by
radiative corrections in 2HDM's. Specifically, we analyze the cases of
gaugino/higgsino effect on MSSM, and a new model with an extra exotic quark
doublet. The new model, while demonstrating well the Georgi-Pais theorem, is
also expected to be phenomenlogically interesting.
| [
{
"created": "Fri, 29 May 1998 21:13:50 GMT",
"version": "v1"
}
] | 2009-10-31 | [
[
"Kong",
"Otto C. W.",
"",
"Rochester U."
],
[
"Lin",
"Feng-Li",
"",
"Virginia Tech."
]
] | We discuss the feasibility of spontaneous CP violation being induced by radiative corrections in 2HDM's. Specifically, we analyze the cases of gaugino/higgsino effect on MSSM, and a new model with an extra exotic quark doublet. The new model, while demonstrating well the Georgi-Pais theorem, is also expected to be phenomenlogically interesting. |
1103.2689 | Urko Reinosa | Urko Reinosa and Zsolt Szep | Broken phase scalar effective potential and Phi-derivable approximations | 23 pages, 5 figures, uses revtex4 | Phys.Rev.D83:125026,2011 | 10.1103/PhysRevD.83.125026 | null | hep-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the effective potential of a real scalar phi^4 theory as a function
of the temperature T within the simplest Phi-derivable approximation, namely
the Hartree approximation. We apply renormalization at a "high" temperature T*
where the theory is required to be in its symmetric phase and study how the
effective potential evolves as the temperature is lowered down to T=0. In
particular, we prove analytically that no second order phase transition can
occur in this particular approximation of the theory, in agreement with earlier
studies based on the numerical evaluation or the high temperature expansion of
the effective potential. This work is also an opportunity to illustrate certain
issues on the renormalization of Phi-derivable approximations at finite
temperature and non-vanishing field expectation value, and to introduce new
computational techniques which might also prove useful when dealing with higher
order approximations.
| [
{
"created": "Mon, 14 Mar 2011 15:15:36 GMT",
"version": "v1"
}
] | 2015-03-19 | [
[
"Reinosa",
"Urko",
""
],
[
"Szep",
"Zsolt",
""
]
] | We study the effective potential of a real scalar phi^4 theory as a function of the temperature T within the simplest Phi-derivable approximation, namely the Hartree approximation. We apply renormalization at a "high" temperature T* where the theory is required to be in its symmetric phase and study how the effective potential evolves as the temperature is lowered down to T=0. In particular, we prove analytically that no second order phase transition can occur in this particular approximation of the theory, in agreement with earlier studies based on the numerical evaluation or the high temperature expansion of the effective potential. This work is also an opportunity to illustrate certain issues on the renormalization of Phi-derivable approximations at finite temperature and non-vanishing field expectation value, and to introduce new computational techniques which might also prove useful when dealing with higher order approximations. |
hep-ph/9403324 | Mark Alford | Mark Alford | Critical Exponents without the Epsilon Expansion | 8 pages, CLNS 94/1279, latex | Phys.Lett. B336 (1994) 237-242 | 10.1016/0370-2693(94)01005-6 | null | hep-ph | null | We argue that the sharp-cutoff Wilson renormalization group provides a
powerful tool for the analysis of second-order and weakly first-order phase
transitions. In particular, in a computation no harder than the calculation of
the 1-loop effective potential, we show that the Wilson RG yields the fixed
point couplings and critical exponents of 3-dimensional $O(N)$ scalar field
theory, with results close to those obtained in high-order $\ep$-% expansion
and large-$N$ calculations. We discuss the prospects for an even more precise
computation.
| [
{
"created": "Tue, 22 Mar 1994 00:55:06 GMT",
"version": "v1"
}
] | 2009-10-28 | [
[
"Alford",
"Mark",
""
]
] | We argue that the sharp-cutoff Wilson renormalization group provides a powerful tool for the analysis of second-order and weakly first-order phase transitions. In particular, in a computation no harder than the calculation of the 1-loop effective potential, we show that the Wilson RG yields the fixed point couplings and critical exponents of 3-dimensional $O(N)$ scalar field theory, with results close to those obtained in high-order $\ep$-% expansion and large-$N$ calculations. We discuss the prospects for an even more precise computation. |
2008.02673 | Yuichi Uesaka | Takaaki Nomura, Hiroshi Okada, Yuichi Uesaka | A two-loop induced neutrino mass model, dark matter, and LFV processes
$\ell_i \to \ell_j \gamma$, and $\mu e \to e e$ in a hidden local $U(1)$
symmetry | 16 pages, 11 figures. arXiv admin note: text overlap with
arXiv:2005.05527 | null | 10.1016/j.nuclphysb.2020.115236 | KIAS-P20041, APCTP Pre2020 - 016 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We discuss a model based on a hidden $U(1)_X$ gauge symmetry in which
neutrino mass is induced at two-loop level by effects of interactions among
particles in hidden sector and the Standard Model leptons. Since neutrino mass
is suppressed by two-loop, its associate Yukawa couplings can be sizable and it
would affect lepton flavor phenomenology. We analyze neutrino mass matrix,
lepton flavor violating processes, electron/muon $g-2$ and dark matter
annihilation cross section which are induced via interactions among Standard
Model leptons and particles in $U(1)_X$ hidden sector, and their interactions
can be sizable in our scenario. Performing numerical analysis, we show expected
ratios for these processes using allowed parameters which can fit the neutrino
data and satisfy flavor constraints.
| [
{
"created": "Wed, 5 Aug 2020 09:26:22 GMT",
"version": "v1"
}
] | 2020-12-30 | [
[
"Nomura",
"Takaaki",
""
],
[
"Okada",
"Hiroshi",
""
],
[
"Uesaka",
"Yuichi",
""
]
] | We discuss a model based on a hidden $U(1)_X$ gauge symmetry in which neutrino mass is induced at two-loop level by effects of interactions among particles in hidden sector and the Standard Model leptons. Since neutrino mass is suppressed by two-loop, its associate Yukawa couplings can be sizable and it would affect lepton flavor phenomenology. We analyze neutrino mass matrix, lepton flavor violating processes, electron/muon $g-2$ and dark matter annihilation cross section which are induced via interactions among Standard Model leptons and particles in $U(1)_X$ hidden sector, and their interactions can be sizable in our scenario. Performing numerical analysis, we show expected ratios for these processes using allowed parameters which can fit the neutrino data and satisfy flavor constraints. |
2206.08253 | Takhmasib Aliev | T.M.Aliev, S.Bilmis, M.Savci | Weak $\Xi_{QQ} \to \Sigma_Q \ell^+ \ell^-$ decays induced by FCNC in QCD | null | null | 10.1140/epjc/s10052-022-10845-5 | null | hep-ph hep-ex hep-lat | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | With the discovery of the doubly heavy $\Xi_{cc}$ baryon, comprehensive
studies of the properties of the doubly heavy baryons are started. In the
present work, we examine the $\Xi_{bb} \to \Sigma_b \ell^+ \ell^-$ and
$\Xi_{cc} \to \Sigma_c \ell^+ \ell^-$ decays induced by flavor-changing neutral
currents (FCNC) in the framework of the light-cone sum rules. After obtaining
the sum rules for the form factors induced by the tensor current, the branching
ratios of the relevant transitions are estimated. We found that the branching
ratio for the $c \to u$ transition is around five orders smaller than the $b
\to d$ transition. Our findings are also compared with other approaches.
| [
{
"created": "Thu, 16 Jun 2022 15:46:58 GMT",
"version": "v1"
},
{
"created": "Fri, 14 Oct 2022 08:17:14 GMT",
"version": "v2"
}
] | 2022-10-17 | [
[
"Aliev",
"T. M.",
""
],
[
"Bilmis",
"S.",
""
],
[
"Savci",
"M.",
""
]
] | With the discovery of the doubly heavy $\Xi_{cc}$ baryon, comprehensive studies of the properties of the doubly heavy baryons are started. In the present work, we examine the $\Xi_{bb} \to \Sigma_b \ell^+ \ell^-$ and $\Xi_{cc} \to \Sigma_c \ell^+ \ell^-$ decays induced by flavor-changing neutral currents (FCNC) in the framework of the light-cone sum rules. After obtaining the sum rules for the form factors induced by the tensor current, the branching ratios of the relevant transitions are estimated. We found that the branching ratio for the $c \to u$ transition is around five orders smaller than the $b \to d$ transition. Our findings are also compared with other approaches. |
1005.0618 | Diego Guadagnoli | Kiwoon Choi, Diego Guadagnoli, Sang Hui Im, Chan Beom Park | Sparticle masses from transverse mass kinks at the LHC: the case of
Yukawa-unified SUSY GUTs | 1+26 pages, 11 figures, 5 tables. v3: references and a few textual
clarifications added. Matches journal version | JHEP 1010:025,2010 | 10.1007/JHEP10(2010)025 | TUM-HEP-759/10 | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We explore, in a concrete example, to which extent new particle mass
determinations are practicable with LHC data. Our chosen example is that of
Yukawa-unified SUSY GUTs, whose viability has been recently studied for two
general patterns of soft SUSY-breaking terms. We note that both patterns of
SUSY spectra do not admit long decay chains, which would make it possible to
determine the masses of the SUSY particles involved using endpoints or mass
relations. We thus take the so-called mT2-kink method as our key strategy,
since it does not rely on the presence of long decay chains. We then discuss a
procedure allowing to determine the masses of the gluino, of the lightest
chargino as well as of the first two neutralinos and, for the scenario where a
stop is lighter than the gluino, the mass of the light stop too. Our worked
example of Yukawa-unified SUSY GUTs may offer a useful playground for dealing
with other theories which predict similar patterns of SUSY spectra.
| [
{
"created": "Tue, 4 May 2010 20:00:04 GMT",
"version": "v1"
},
{
"created": "Wed, 12 May 2010 16:27:05 GMT",
"version": "v2"
},
{
"created": "Sun, 17 Oct 2010 11:37:20 GMT",
"version": "v3"
}
] | 2015-03-17 | [
[
"Choi",
"Kiwoon",
""
],
[
"Guadagnoli",
"Diego",
""
],
[
"Im",
"Sang Hui",
""
],
[
"Park",
"Chan Beom",
""
]
] | We explore, in a concrete example, to which extent new particle mass determinations are practicable with LHC data. Our chosen example is that of Yukawa-unified SUSY GUTs, whose viability has been recently studied for two general patterns of soft SUSY-breaking terms. We note that both patterns of SUSY spectra do not admit long decay chains, which would make it possible to determine the masses of the SUSY particles involved using endpoints or mass relations. We thus take the so-called mT2-kink method as our key strategy, since it does not rely on the presence of long decay chains. We then discuss a procedure allowing to determine the masses of the gluino, of the lightest chargino as well as of the first two neutralinos and, for the scenario where a stop is lighter than the gluino, the mass of the light stop too. Our worked example of Yukawa-unified SUSY GUTs may offer a useful playground for dealing with other theories which predict similar patterns of SUSY spectra. |
hep-ph/9310303 | Kurt Langfeld | K. Langfeld | The Non-Trivial Phase of $\phi ^{4}$-Theory in an External Magnetic
Field and at Finite Temperature | 12 LaTex pages (3 figures available on request), UNITUE-THEP-11-1993 | null | null | null | hep-ph | null | The effective potential for the order parameter $\phi ^{\dagger } \phi$ is
investigated in massless $\phi ^{4}$-theory in the presence of magnetic fields
at finite temperature. It is found that the first order nature of the phase
transition from the non-trivial to the perturbative ground state at a critical
temperature is unchanged by the presence of magnetic fields, though they do
increase the critical temperature and weaken the barrier separating the
perturbative from the non-trivial phase. The results might be relevant for the
electro-weak phase transition as well as for inflationary models of the early
universe.
| [
{
"created": "Mon, 18 Oct 1993 10:13:54 GMT",
"version": "v1"
}
] | 2009-09-25 | [
[
"Langfeld",
"K.",
""
]
] | The effective potential for the order parameter $\phi ^{\dagger } \phi$ is investigated in massless $\phi ^{4}$-theory in the presence of magnetic fields at finite temperature. It is found that the first order nature of the phase transition from the non-trivial to the perturbative ground state at a critical temperature is unchanged by the presence of magnetic fields, though they do increase the critical temperature and weaken the barrier separating the perturbative from the non-trivial phase. The results might be relevant for the electro-weak phase transition as well as for inflationary models of the early universe. |
1902.08623 | Katelin Schutz | Cora Dvorkin, Tongyan Lin, Katelin Schutz | Making dark matter out of light: freeze-in from plasma effects | 23+8 pages, 8+1 figures | Phys. Rev. D 99, 115009 (2019) | 10.1103/PhysRevD.99.115009 | null | hep-ph astro-ph.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Dark matter (DM) could couple to particles in the Standard Model (SM) through
a light vector mediator. In the limit of small coupling, this portal could be
responsible for producing the observed DM abundance through a mechanism known
as freeze-in. Furthermore, the requisite DM-SM couplings provide a concrete
benchmark for direct and indirect searches for DM. In this paper, we present
updated calculations of the relic abundance for DM produced by freeze-in
through a light vector mediator. We identify an additional production channel:
the decay of photons that acquire an in-medium plasma mass. These plasmon
decays are a dominant channel for DM production for sub-MeV DM masses, and
including this channel leads to a significant reduction in the predicted signal
strength for DM searches. Accounting for production from both plasmon decays
and annihilations of SM fermions, the DM acquires a highly non-thermal phase
space distribution which impacts the cosmology at later times; these
cosmological effects will be explored in a companion paper.
| [
{
"created": "Fri, 22 Feb 2019 19:00:00 GMT",
"version": "v1"
}
] | 2019-06-19 | [
[
"Dvorkin",
"Cora",
""
],
[
"Lin",
"Tongyan",
""
],
[
"Schutz",
"Katelin",
""
]
] | Dark matter (DM) could couple to particles in the Standard Model (SM) through a light vector mediator. In the limit of small coupling, this portal could be responsible for producing the observed DM abundance through a mechanism known as freeze-in. Furthermore, the requisite DM-SM couplings provide a concrete benchmark for direct and indirect searches for DM. In this paper, we present updated calculations of the relic abundance for DM produced by freeze-in through a light vector mediator. We identify an additional production channel: the decay of photons that acquire an in-medium plasma mass. These plasmon decays are a dominant channel for DM production for sub-MeV DM masses, and including this channel leads to a significant reduction in the predicted signal strength for DM searches. Accounting for production from both plasmon decays and annihilations of SM fermions, the DM acquires a highly non-thermal phase space distribution which impacts the cosmology at later times; these cosmological effects will be explored in a companion paper. |
hep-ph/9602407 | Sergio Lupia | Alberto Giovannini (Turin U. & INFN, Turin), Sergio Lupia (Munich, Max
Planck Inst.), Roberto Ugoccioni (Lund U.) | Common origin of the shoulder in multiplicity distributions and of
oscillations in the factorial cumulants to factorial moments ratio | LaTeX, 13 pages including 2 Postscript figures, uses epsfig.sty | Phys.Lett.B374:231-237,1996 | 10.1016/0370-2693(96)00258-4 | DFTT 9/96, MPI-PhT/96-9, LU TP 96-7 | hep-ph | null | The shoulder structure of charged particles multiplicity distributions (MD's)
in full phase space in $e^+e^-$ annihilation at the $Z_0$ peak and the
quasi-oscillatory behavior of the ratio of factorial cumulants over factorial
moments, $H_q$, as a function of the order $q$, are quantitatively reproduced
within a simple parametrization of the MD in terms of a weighted superposition
of two Negative Binomial Distributions, associated to two- and multi-jet
production, i.e., to hard gluons radiation.
| [
{
"created": "Tue, 27 Feb 1996 11:04:48 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Giovannini",
"Alberto",
"",
"Turin U. & INFN, Turin"
],
[
"Lupia",
"Sergio",
"",
"Munich, Max\n Planck Inst."
],
[
"Ugoccioni",
"Roberto",
"",
"Lund U."
]
] | The shoulder structure of charged particles multiplicity distributions (MD's) in full phase space in $e^+e^-$ annihilation at the $Z_0$ peak and the quasi-oscillatory behavior of the ratio of factorial cumulants over factorial moments, $H_q$, as a function of the order $q$, are quantitatively reproduced within a simple parametrization of the MD in terms of a weighted superposition of two Negative Binomial Distributions, associated to two- and multi-jet production, i.e., to hard gluons radiation. |
1211.0667 | Helen Matskevich | S.M. Gerasyuta and E.E. Matskevich | Relativistic quark-gluon description of $^3 He$ | 19 pages. arXiv admin note: substantial text overlap with
arXiv:1009.3365, arXiv:1003.0257 | null | null | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The relativistic nine-quark equations are found in the framework of the
dispersion relation technique. $ ^3 He$ nucleus is described by these
equations. We consider the $ ^3 He$ as the system of interacting quarks and
gluons. The approximate solutions of these equations using the method based on
the extraction of leading singularities of the amplitudes are obtained. The
relativistic nine-quark amplitudes of $ ^3 He$, including the $u$, $d$ quarks
are calculated. The poles of these amplitudes determine the mass of nine-quark
system. The $ ^3 He$ mass $M=2809\, MeV$ is calculated. The gluon coupling
constant in the light nuclei region is equal to $g=0.1536$. The gluon
interaction of $ ^3 He$ is obtained in 2 -- 3 time smaller as compared with
baryon interaction.
| [
{
"created": "Sun, 4 Nov 2012 07:43:29 GMT",
"version": "v1"
}
] | 2019-08-19 | [
[
"Gerasyuta",
"S. M.",
""
],
[
"Matskevich",
"E. E.",
""
]
] | The relativistic nine-quark equations are found in the framework of the dispersion relation technique. $ ^3 He$ nucleus is described by these equations. We consider the $ ^3 He$ as the system of interacting quarks and gluons. The approximate solutions of these equations using the method based on the extraction of leading singularities of the amplitudes are obtained. The relativistic nine-quark amplitudes of $ ^3 He$, including the $u$, $d$ quarks are calculated. The poles of these amplitudes determine the mass of nine-quark system. The $ ^3 He$ mass $M=2809\, MeV$ is calculated. The gluon coupling constant in the light nuclei region is equal to $g=0.1536$. The gluon interaction of $ ^3 He$ is obtained in 2 -- 3 time smaller as compared with baryon interaction. |
hep-ph/0301175 | Alessio Del Fabbro | A.Del Fabbro, D.Treleani | b \bar b b\bar b production in proton-nucleus collisions at the LHC | 13 pages, 4 figures | null | 10.1103/PhysRevD.70.034022 | null | hep-ph | null | A sizable rate of events, with several pairs of $b$-quarks produced
contemporarily by multiple parton interactions, may be expected at very high
energies as a consequence of the large parton luminosities. The production
rates are further enhanced in hadron-nucleus reactions, which may represent a
convenient tool to study the phenomenon. We compare the different contributions
to $b{\bar b}b{\bar b}$ production, due to single and double parton
scatterings, in collisions of protons with nuclei at the CERN-LHC.
| [
{
"created": "Tue, 21 Jan 2003 14:16:21 GMT",
"version": "v1"
}
] | 2013-05-29 | [
[
"Del Fabbro",
"A.",
""
],
[
"Treleani",
"D.",
""
]
] | A sizable rate of events, with several pairs of $b$-quarks produced contemporarily by multiple parton interactions, may be expected at very high energies as a consequence of the large parton luminosities. The production rates are further enhanced in hadron-nucleus reactions, which may represent a convenient tool to study the phenomenon. We compare the different contributions to $b{\bar b}b{\bar b}$ production, due to single and double parton scatterings, in collisions of protons with nuclei at the CERN-LHC. |
hep-ph/0105328 | Akushevich Igor | A.V. Afanasev, I. Akushevich, A.Ilyichev, N.P.Merenkov | QED Radiative Corrections to Asymmetries of Elastic ep-scattering in
Hadronic Variables | 9 pages, 5 figures | Phys.Lett.B514:269-278,2001 | 10.1016/S0370-2693(01)00816-4 | null | hep-ph | null | Compact analytical formulae for QED radiative corrections in the processes of
elastic $e-p$ scattering are obtained in the case when kinematic variables are
reconstructed from the recoil proton momentum measured. Numerical analysis is
presented under kinematic conditions of current experiments at JLab.
| [
{
"created": "Wed, 30 May 2001 20:45:52 GMT",
"version": "v1"
}
] | 2014-11-17 | [
[
"Afanasev",
"A. V.",
""
],
[
"Akushevich",
"I.",
""
],
[
"Ilyichev",
"A.",
""
],
[
"Merenkov",
"N. P.",
""
]
] | Compact analytical formulae for QED radiative corrections in the processes of elastic $e-p$ scattering are obtained in the case when kinematic variables are reconstructed from the recoil proton momentum measured. Numerical analysis is presented under kinematic conditions of current experiments at JLab. |
hep-ph/0001075 | John Tjon | Yu.A. Simonov (ITEP,Moscow, Russia), J.A. Tjon (ITP,U. Utrecht,The
Netherlands) | String formation and chiral symmetry breaking in the heavy-light
quark-antiquark system in QCD | 17 pages Revtex, 3 figures | Phys.Rev. D62 (2000) 014501 | 10.1103/PhysRevD.62.014501 | null | hep-ph | null | The effective quark Lagrangian is written for a light quark in the field of a
static antiquark, explicitly containing field correlators as coefficient
functions of products of quark operators. At large N_c the closed system of
equations for the gauge-invariant quark Green's function in the field of static
source is examined analytically. The formation of the string connecting the
light quark to the static source is observed numerically. The scalar Lorentz
nature of the resulting confinement is shown to hold for the considered case,
implying chiral symmetry breaking. The resulting spectrum with and without
perturbative gluon exchanges is obtained numerically and compared to the B and
D meson masses and HQET.
| [
{
"created": "Mon, 10 Jan 2000 20:50:50 GMT",
"version": "v1"
}
] | 2009-10-31 | [
[
"Simonov",
"Yu. A.",
"",
"ITEP,Moscow, Russia"
],
[
"Tjon",
"J. A.",
"",
"ITP,U. Utrecht,The\n Netherlands"
]
] | The effective quark Lagrangian is written for a light quark in the field of a static antiquark, explicitly containing field correlators as coefficient functions of products of quark operators. At large N_c the closed system of equations for the gauge-invariant quark Green's function in the field of static source is examined analytically. The formation of the string connecting the light quark to the static source is observed numerically. The scalar Lorentz nature of the resulting confinement is shown to hold for the considered case, implying chiral symmetry breaking. The resulting spectrum with and without perturbative gluon exchanges is obtained numerically and compared to the B and D meson masses and HQET. |
hep-ph/0404251 | Puneet Batra | Puneet Batra, Antonio Delgado, David E. Kaplan, Tim M.P. Tait | Running into New Territory in SUSY Parameter Space | 15 pages, 5 figures; Typo in equation (4.5) corrected; submitted to
JHEP | JHEP 0406:032,2004 | 10.1088/1126-6708/2004/06/032 | FERMILAB-PUB-04/038-T, SU-ITP-04/12 | hep-ph | null | The LEP-II bound on the light Higgs mass rules out the vast majority of
parameter space left to the Minimal Supersymmetric Standard Model (MSSM) with
weak-scale soft-masses. This suggests the importance of exploring extensions of
the MSSM with non-minimal Higgs physics. In this article, we explore a theory
with an additional singlet superfield and an extended gauge sector. The theory
has a number of novel features compared to both the MSSM and Next-to-MSSM,
including easily realizing a light CP-even Higgs mass consistent with LEP-II
limits, tan(beta) < 1, and a lightest Higgs which is charged. These features
are achieved while remaining consistent with perturbative unification and
without large stop-masses. Discovery modes at the Tevatron and LHC are
discussed.
| [
{
"created": "Wed, 28 Apr 2004 00:02:30 GMT",
"version": "v1"
},
{
"created": "Tue, 4 May 2004 17:43:09 GMT",
"version": "v2"
}
] | 2010-02-03 | [
[
"Batra",
"Puneet",
""
],
[
"Delgado",
"Antonio",
""
],
[
"Kaplan",
"David E.",
""
],
[
"Tait",
"Tim M. P.",
""
]
] | The LEP-II bound on the light Higgs mass rules out the vast majority of parameter space left to the Minimal Supersymmetric Standard Model (MSSM) with weak-scale soft-masses. This suggests the importance of exploring extensions of the MSSM with non-minimal Higgs physics. In this article, we explore a theory with an additional singlet superfield and an extended gauge sector. The theory has a number of novel features compared to both the MSSM and Next-to-MSSM, including easily realizing a light CP-even Higgs mass consistent with LEP-II limits, tan(beta) < 1, and a lightest Higgs which is charged. These features are achieved while remaining consistent with perturbative unification and without large stop-masses. Discovery modes at the Tevatron and LHC are discussed. |
1710.05775 | Shivaramakrishna Singirala | Shivaramakrishna Singirala, Rukmani Mohanta, Sudhanwa Patra, Soumya
Rao | Majorana Dark Matter in a new B-L model | 20 pages, 7 figures, version to appear in JCAP | null | 10.1088/1475-7516/2018/11/026 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present a comprehensive study of Majorana dark matter in a $U(1)_{B-L}$
gauge extension of the standard model, where three exotic fermions with $B-L$
charges as $-4, -4, +5$ are added to make the model free from the triangle
gauge anomalies. The enriched scalar sector and the new heavy gauge boson
$Z^{\prime},$ associated with the $U(1)_{B-L}$ symmetry make the model
advantageous to be explored in dual portal scenarios for the search of dark
matter signal. Diagonalizing the exotic fermion mass matrix, we obtain the
Majorana mass eigenstates, of which the lightest one plays the role of dark
matter. Analyzing the effect of two mediators separately, the scalar portal
channels give a viable parameter space consistent with relic density from
PLANCK data and the direct detection limits from various experiments such as
LUX, XENON1T and PandaX. While the $Z^{\prime}$ mediated channels are
constrained from relic abundance and LHC searches for $Z^{\prime}$ in the
dilepton channel. A massless physical Goldstone boson plays a key role in the
scalar portal relic density. Finally, we briefly discuss the neutrino mass
generation at one-loop level.
| [
{
"created": "Mon, 16 Oct 2017 15:13:50 GMT",
"version": "v1"
},
{
"created": "Thu, 8 Nov 2018 11:40:16 GMT",
"version": "v2"
}
] | 2018-11-28 | [
[
"Singirala",
"Shivaramakrishna",
""
],
[
"Mohanta",
"Rukmani",
""
],
[
"Patra",
"Sudhanwa",
""
],
[
"Rao",
"Soumya",
""
]
] | We present a comprehensive study of Majorana dark matter in a $U(1)_{B-L}$ gauge extension of the standard model, where three exotic fermions with $B-L$ charges as $-4, -4, +5$ are added to make the model free from the triangle gauge anomalies. The enriched scalar sector and the new heavy gauge boson $Z^{\prime},$ associated with the $U(1)_{B-L}$ symmetry make the model advantageous to be explored in dual portal scenarios for the search of dark matter signal. Diagonalizing the exotic fermion mass matrix, we obtain the Majorana mass eigenstates, of which the lightest one plays the role of dark matter. Analyzing the effect of two mediators separately, the scalar portal channels give a viable parameter space consistent with relic density from PLANCK data and the direct detection limits from various experiments such as LUX, XENON1T and PandaX. While the $Z^{\prime}$ mediated channels are constrained from relic abundance and LHC searches for $Z^{\prime}$ in the dilepton channel. A massless physical Goldstone boson plays a key role in the scalar portal relic density. Finally, we briefly discuss the neutrino mass generation at one-loop level. |
hep-ph/0002234 | Marco Fabbrichesi | Stefano Bertolini, Jan O. Eeg and Marco Fabbrichesi | An updated analysis of eps'/eps in the standard model with hadronic
matrix elements from the chiral quark model | 15 pages, 11 figures, RevTeX, discussion updated, refs added | Phys.Rev.D63:056009,2001 | 10.1103/PhysRevD.63.056009 | null | hep-ph | null | We discuss the theoretical and experimental status of the CP violating ratio
eps'/eps. We revise our 1997 standard-model estimate-based on hadronic matrix
elements computed in the chiral quark model up to O(p^4) in the chiral
expansion-by including an improved statistical analysis of the uncertainties
and updated determination of the Cabibbo-Kobayashi-Maskawa elements and other
short-distance parameters. Using normal distributions for the experimental
input data we find Re eps'/eps = (2.2 \pm 0.8) x 10^{-3}, whereas a flat
scanning gives 0.9 x 10^{-3} < Re eps'/eps < 4.8 x 10^{-3}. Both results are in
agreement with the current experimental data. The key element in our estimate
is, as before, the fit of the Delta I=1/2 rule, which allows us to absorb most
of the theoretical uncertainties in the determination of the model-dependent
parameters in the hadronic matrix elements. Our semi-phenomenological approach
leads to numerical stability against variations of the renormalization scale
and scheme dependence of the short- and long-distance components. The same
dynamical mechanism at work in the selection rule also explains the larger
value obtained for \ratio with respect to other estimates. A coherent picture
of K -> pi pi decays is thus provided.
| [
{
"created": "Wed, 23 Feb 2000 17:54:16 GMT",
"version": "v1"
},
{
"created": "Tue, 14 Mar 2000 13:39:42 GMT",
"version": "v2"
},
{
"created": "Wed, 28 Jun 2000 15:57:31 GMT",
"version": "v3"
},
{
"created": "Tue, 11 Jul 2000 11:00:50 GMT",
"version": "v4"
},
{
"c... | 2014-11-17 | [
[
"Bertolini",
"Stefano",
""
],
[
"Eeg",
"Jan O.",
""
],
[
"Fabbrichesi",
"Marco",
""
]
] | We discuss the theoretical and experimental status of the CP violating ratio eps'/eps. We revise our 1997 standard-model estimate-based on hadronic matrix elements computed in the chiral quark model up to O(p^4) in the chiral expansion-by including an improved statistical analysis of the uncertainties and updated determination of the Cabibbo-Kobayashi-Maskawa elements and other short-distance parameters. Using normal distributions for the experimental input data we find Re eps'/eps = (2.2 \pm 0.8) x 10^{-3}, whereas a flat scanning gives 0.9 x 10^{-3} < Re eps'/eps < 4.8 x 10^{-3}. Both results are in agreement with the current experimental data. The key element in our estimate is, as before, the fit of the Delta I=1/2 rule, which allows us to absorb most of the theoretical uncertainties in the determination of the model-dependent parameters in the hadronic matrix elements. Our semi-phenomenological approach leads to numerical stability against variations of the renormalization scale and scheme dependence of the short- and long-distance components. The same dynamical mechanism at work in the selection rule also explains the larger value obtained for \ratio with respect to other estimates. A coherent picture of K -> pi pi decays is thus provided. |
2110.08921 | Anthony E. Mirasola | Kay Kirkpatrick and Anthony E. Mirasola and Chanda Prescod-Weinstein | Analysis of Bose-Einstein condensation times for self-interacting scalar
dark matter | 5 pages, 1 figure | Phys. Rev. D 106, 043512 (2022) | 10.1103/PhysRevD.106.043512 | null | hep-ph astro-ph.CO | http://creativecommons.org/licenses/by/4.0/ | We investigate the condensation time of self-interacting axion-like particles
in a gravitational well, extending the prior work [arXiv:2007.07438] which
showed that the Wigner formalism is a good analytic approach to describe a
condensing scalar field. In the present work, we use this formalism to affirm
that $\phi^4$ self-interactions will take longer than necessary to support the
time scales associated with structure formation, making gravity a necessary
part of the process to bring axion dark matter into a solitonic form. Here we
show that when the axions' virial velocity is taken into account, the time
scale associated with self-interactions will scale as $\lambda^2$. This is
consistent with recent numerical estimates, and it confirms that the Wigner
formalism described in prior work~\cite{Relax} is a helpful analytic framework
to check computational work for potential numerical artifacts.
| [
{
"created": "Sun, 17 Oct 2021 21:12:09 GMT",
"version": "v1"
},
{
"created": "Tue, 30 Aug 2022 13:51:36 GMT",
"version": "v2"
}
] | 2022-08-31 | [
[
"Kirkpatrick",
"Kay",
""
],
[
"Mirasola",
"Anthony E.",
""
],
[
"Prescod-Weinstein",
"Chanda",
""
]
] | We investigate the condensation time of self-interacting axion-like particles in a gravitational well, extending the prior work [arXiv:2007.07438] which showed that the Wigner formalism is a good analytic approach to describe a condensing scalar field. In the present work, we use this formalism to affirm that $\phi^4$ self-interactions will take longer than necessary to support the time scales associated with structure formation, making gravity a necessary part of the process to bring axion dark matter into a solitonic form. Here we show that when the axions' virial velocity is taken into account, the time scale associated with self-interactions will scale as $\lambda^2$. This is consistent with recent numerical estimates, and it confirms that the Wigner formalism described in prior work~\cite{Relax} is a helpful analytic framework to check computational work for potential numerical artifacts. |
1901.01304 | J. Lorenzo Diaz-Cruz | M. A. Arroyo-Urena (1), J. Lorenzo Diaz-Cruz (2 and 3), Bryan O.
Larios-Lopez (2 and 4), M. A. Perez-de Leon (3) ( (1) Facultad de Estudios
Superiores Cuautitlan -UNAM, (2) Mesoamerican Center for Theoretical Physics,
UNACH, (3) CIFFU and Facultad de Ciencias F\'isico - Matem\'aticas, BUAP, (4)
Departamento de Gravitaci\'on y Altas Energ\'ias, Facultad de Ciencias,
Universidad Nacional Aut\'onoma de Honduras ) | A Private SUSY 4HDM with FCNC in the Up-sector | Version accepted in Chin. Phys. C, new author added, 23 pages, with
17 figures, 2 tables | null | null | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present a SUSY model with four Higgs doublets of the ``private type",
where each fermion type (up, down, and charged leptons) obtain their masses
from a different Higgs doublet H_f ( f = u_1, d, e). The conditions for anomaly
cancellation, imply that the remaining Higgs doublet of the model (H_{u_2}),
must have the same hypercharge as H_{u_1}, and thus can only couple to up-type
quarks, which opens the possibility to have FCNC's only in this sector. We
study the Lagrangian of the model, and in particular the Higgs potential, in
order to identify the Higgs mass-eigenstates and their interactions; for the
Yukawa matrices we consider the 4-texture case. We obtain constraints on the
model parameters by using LHC measurements on the properties of the 125 GeV
Higgs boson ($h$), and identify viable regions of parameter space. These
constraints are then used to evaluate the prospects to detect the FCNC decay
mode t -> ch at the future high-luminosity (HL) option for the LHC, which are
compared with current limits from LHC-run2. Then, we also evaluate the FCNC
decay of the next heavier Higgs boson H_2 -> tc, which can reach typically
BR(H_2 -> tc) = O(10^{-4}-10^{-5} ); the search for the signal at HL-LHC is
also studied, finding that it could be detectable for some specific regions of
the model parameter space.
| [
{
"created": "Fri, 4 Jan 2019 20:37:41 GMT",
"version": "v1"
},
{
"created": "Wed, 11 Dec 2019 16:52:39 GMT",
"version": "v2"
},
{
"created": "Mon, 23 Nov 2020 11:16:58 GMT",
"version": "v3"
}
] | 2020-11-24 | [
[
"Arroyo-Urena",
"M. A.",
"",
"2 and 3"
],
[
"Diaz-Cruz",
"J. Lorenzo",
"",
"2 and 3"
],
[
"Larios-Lopez",
"Bryan O.",
"",
"2 and 4"
],
[
"Leon",
"M. A. Perez-de",
""
]
] | We present a SUSY model with four Higgs doublets of the ``private type", where each fermion type (up, down, and charged leptons) obtain their masses from a different Higgs doublet H_f ( f = u_1, d, e). The conditions for anomaly cancellation, imply that the remaining Higgs doublet of the model (H_{u_2}), must have the same hypercharge as H_{u_1}, and thus can only couple to up-type quarks, which opens the possibility to have FCNC's only in this sector. We study the Lagrangian of the model, and in particular the Higgs potential, in order to identify the Higgs mass-eigenstates and their interactions; for the Yukawa matrices we consider the 4-texture case. We obtain constraints on the model parameters by using LHC measurements on the properties of the 125 GeV Higgs boson ($h$), and identify viable regions of parameter space. These constraints are then used to evaluate the prospects to detect the FCNC decay mode t -> ch at the future high-luminosity (HL) option for the LHC, which are compared with current limits from LHC-run2. Then, we also evaluate the FCNC decay of the next heavier Higgs boson H_2 -> tc, which can reach typically BR(H_2 -> tc) = O(10^{-4}-10^{-5} ); the search for the signal at HL-LHC is also studied, finding that it could be detectable for some specific regions of the model parameter space. |
1811.04089 | Srimoyee Sen | Larry D. McLerran, S\"oren Schlichting, Srimoyee Sen | Space-Time Picture of Baryon Stopping in the Color-Glass Condensate | Reference added | Phys. Rev. D 99, 074009 (2019) | 10.1103/PhysRevD.99.074009 | INT-PUB-18-055 | hep-ph nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We discuss baryon stopping in the Color Glass Condensate description of high
energy scattering. We consider the scattering of a distribution of valence
quarks on an ultra-relativistic sheet of colored charge. We compute the
distribution of scattered quarks from a composite projectile, and calculate the
baryon currents before and after the collisions and on an event by event basis.
We obtain simple analytic estimates of the baryon number compression and
rapidity shifts, which in the idealized case of plane wave scattering, produce
results that agree with considerations of Anishetty-Koehler-McLerran.
| [
{
"created": "Fri, 9 Nov 2018 19:00:42 GMT",
"version": "v1"
},
{
"created": "Wed, 28 Nov 2018 20:02:03 GMT",
"version": "v2"
}
] | 2019-04-17 | [
[
"McLerran",
"Larry D.",
""
],
[
"Schlichting",
"Sören",
""
],
[
"Sen",
"Srimoyee",
""
]
] | We discuss baryon stopping in the Color Glass Condensate description of high energy scattering. We consider the scattering of a distribution of valence quarks on an ultra-relativistic sheet of colored charge. We compute the distribution of scattered quarks from a composite projectile, and calculate the baryon currents before and after the collisions and on an event by event basis. We obtain simple analytic estimates of the baryon number compression and rapidity shifts, which in the idealized case of plane wave scattering, produce results that agree with considerations of Anishetty-Koehler-McLerran. |
1408.2517 | Martin Hoferichter | Gilberto Colangelo, Martin Hoferichter, Bastian Kubis, Massimiliano
Procura, Peter Stoffer | Towards a data-driven analysis of hadronic light-by-light scattering | 7 pages, 4 figures, 2 tables, journal version | null | 10.1016/j.physletb.2014.09.021 | null | hep-ph hep-ex nucl-ex nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The hadronic light-by-light contribution to the anomalous magnetic moment of
the muon was recently analyzed in the framework of dispersion theory, providing
a systematic formalism where all input quantities are expressed in terms of
on-shell form factors and scattering amplitudes that are in principle
accessible in experiment. We briefly review the main ideas behind this
framework and discuss the various experimental ingredients needed for the
evaluation of one- and two-pion intermediate states. In particular, we identify
processes that in the absence of data for doubly-virtual pion-photon
interactions can help constrain parameters in the dispersive reconstruction of
the relevant input quantities, the pion transition form factor and the helicity
partial waves for $\gamma^*\gamma^*\to\pi\pi$.
| [
{
"created": "Mon, 11 Aug 2014 20:00:01 GMT",
"version": "v1"
},
{
"created": "Tue, 16 Sep 2014 08:12:23 GMT",
"version": "v2"
}
] | 2015-06-22 | [
[
"Colangelo",
"Gilberto",
""
],
[
"Hoferichter",
"Martin",
""
],
[
"Kubis",
"Bastian",
""
],
[
"Procura",
"Massimiliano",
""
],
[
"Stoffer",
"Peter",
""
]
] | The hadronic light-by-light contribution to the anomalous magnetic moment of the muon was recently analyzed in the framework of dispersion theory, providing a systematic formalism where all input quantities are expressed in terms of on-shell form factors and scattering amplitudes that are in principle accessible in experiment. We briefly review the main ideas behind this framework and discuss the various experimental ingredients needed for the evaluation of one- and two-pion intermediate states. In particular, we identify processes that in the absence of data for doubly-virtual pion-photon interactions can help constrain parameters in the dispersive reconstruction of the relevant input quantities, the pion transition form factor and the helicity partial waves for $\gamma^*\gamma^*\to\pi\pi$. |
hep-ph/0204319 | Urjit A. Yajnik | J.M. Cline (McGill), U.A. Yajnik, S.N. Nayak and M. Rabikumar (I.I.T.,
Bombay) | Transient domain walls and lepton asymmetry in the Left-Right symmetric
model | v2 version accepted for publication in Phys. Rev. D. Discussion in
Introduction and Conclusion sharpened. Equation (12) corrected. 16 pages, 3
figure files, RevTeX4 style | Phys.Rev. D66 (2002) 065001 | 10.1103/PhysRevD.66.065001 | null | hep-ph | null | It is shown that the dynamics of domain walls in Left-Right symmetric models,
separating respective regions of unbroken SU(2)_L and SU(2)_R in the early
universe, can give rise to baryogenesis via leptogenesis. Neutrinos have a
spatially varying complex mass matrix due to CP-violating scalar condensates in
the domain wall. The motion of the wall through the plasma generates a flux of
lepton number across the wall which is converted to a lepton asymmetry by
helicity-flipping scatterings. Subsequent processing of the lepton excess by
sphalerons results in the observed baryon asymmetry, for a range of parameters
in Left-Right symmetric models.
| [
{
"created": "Sat, 27 Apr 2002 12:10:50 GMT",
"version": "v1"
},
{
"created": "Sun, 28 Jul 2002 19:08:10 GMT",
"version": "v2"
}
] | 2009-11-07 | [
[
"Cline",
"J. M.",
"",
"McGill"
],
[
"Yajnik",
"U. A.",
"",
"I.I.T.,\n Bombay"
],
[
"Nayak",
"S. N.",
"",
"I.I.T.,\n Bombay"
],
[
"Rabikumar",
"M.",
"",
"I.I.T.,\n Bombay"
]
] | It is shown that the dynamics of domain walls in Left-Right symmetric models, separating respective regions of unbroken SU(2)_L and SU(2)_R in the early universe, can give rise to baryogenesis via leptogenesis. Neutrinos have a spatially varying complex mass matrix due to CP-violating scalar condensates in the domain wall. The motion of the wall through the plasma generates a flux of lepton number across the wall which is converted to a lepton asymmetry by helicity-flipping scatterings. Subsequent processing of the lepton excess by sphalerons results in the observed baryon asymmetry, for a range of parameters in Left-Right symmetric models. |
2308.05860 | David Curtin | David Curtin and Jaipratap Singh Grewal | Long Lived Particle Decays in MATHUSLA | 17 pages + references, 11 Figures. Detector FastSim and Event Library
publicly available. v2: minor tweaks, no changes to conclusion, published
version | null | null | null | hep-ph hep-ex | http://creativecommons.org/licenses/by/4.0/ | We carefully study the decay and reconstruction of long-lived particle (LLP)
decays in the proposed MATHUSLA LLP detector for the HL-LHC. Our investigations
are focused on three LLP benchmark models. MATHUSLA's primary physics target is
represented by hadronically decaying LLPs with mass above $\sim$
$10~\mathrm{GeV}$, produced in exotic Higgs decays. We also investigate
GeV-scale scalar and right-handed-neutrino LLPs, which are the target of many
other proposed experiments. We first introduce a public MATHUSLA FastSim code
to allow for efficient signal-only studies of LLP decays in MATHUSLA and
general external LLP detectors. For each of our benchmark scenarios, we
carefully simulate LLP production and decay, and make our simulation library
publicly accessible for future investigations and comparisons with other
experiments. We then systematically study the geometric acceptance of MATHUSLA
for LLP decays in these scenarios, and present updated sensitivity projections
that include these acceptances. Our results show that the idealized reach of
MATHUSLA computed in earlier studies is mostly realized. We also investigate
possible ways of increasing the signal acceptance using the inherent geometric
flexibility of the FastSim, which will provide useful inputs for realistic
experimental and engineering optimization of the detector in the future.
| [
{
"created": "Thu, 10 Aug 2023 21:26:28 GMT",
"version": "v1"
},
{
"created": "Sun, 12 May 2024 17:12:07 GMT",
"version": "v2"
}
] | 2024-05-14 | [
[
"Curtin",
"David",
""
],
[
"Grewal",
"Jaipratap Singh",
""
]
] | We carefully study the decay and reconstruction of long-lived particle (LLP) decays in the proposed MATHUSLA LLP detector for the HL-LHC. Our investigations are focused on three LLP benchmark models. MATHUSLA's primary physics target is represented by hadronically decaying LLPs with mass above $\sim$ $10~\mathrm{GeV}$, produced in exotic Higgs decays. We also investigate GeV-scale scalar and right-handed-neutrino LLPs, which are the target of many other proposed experiments. We first introduce a public MATHUSLA FastSim code to allow for efficient signal-only studies of LLP decays in MATHUSLA and general external LLP detectors. For each of our benchmark scenarios, we carefully simulate LLP production and decay, and make our simulation library publicly accessible for future investigations and comparisons with other experiments. We then systematically study the geometric acceptance of MATHUSLA for LLP decays in these scenarios, and present updated sensitivity projections that include these acceptances. Our results show that the idealized reach of MATHUSLA computed in earlier studies is mostly realized. We also investigate possible ways of increasing the signal acceptance using the inherent geometric flexibility of the FastSim, which will provide useful inputs for realistic experimental and engineering optimization of the detector in the future. |
2404.17574 | Sagar Airen | Kaustubh Agashe, Sagar Airen, Roberto Franceschini, Doojin Kim,
Ashutosh V. Kotwal, Lorenzo Ricci, Deepak Sathyan | "Unification" of BSM Searches and SM Measurements: the case of
lepton$+MET$ and $m_W$ | 25 pages, 8 figures | null | null | null | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We develop the idea that the unprecedented precision in Standard Model (SM)
measurements, with further improvement at the HL-LHC, enables new searches for
physics Beyond the Standard Model (BSM).As an illustration, we demonstrate that
the measured kinematic distributions of the lepton$+MET$ final state not only
determine the mass of the $W$ boson, but are also sensitive to light new
physics. Such a search for new physics thus requires a simultaneous fit to the
BSM and SM parameters, "unifying" searches and measurements at the LHC and
Tevatron. In this paper, we complete the program initiated in our earlier work
arXiv:2310.13687. In particular, we analyze ($i$) novel decay modes of the $W$
boson with a neutrinophilic invisible scalar or with a heavy neutrino; ($ii$)
modified production of $W$ bosons, namely, associated with a hadrophilic
invisible $Z^\prime$ gauge boson; and ($iii$) scenarios without an on-shell $W$
boson, such as slepton-sneutrino production in the Minimal Supersymmetric
Standard Model (MSSM). Here, we complement our previous MSSM analysis in
arXiv:2310.13687 by considering a different kinematic region. Our results
highlight that new physics can still be directly discovered at the LHC,
including light new physics,via SM precision measurements. Furthermore, we
illustrate that such BSM signals are subtle, yet potentially large enough to
affect the precision measurements of SM parameters themselves, such as the $W$
boson mass.
| [
{
"created": "Fri, 26 Apr 2024 17:56:45 GMT",
"version": "v1"
}
] | 2024-04-30 | [
[
"Agashe",
"Kaustubh",
""
],
[
"Airen",
"Sagar",
""
],
[
"Franceschini",
"Roberto",
""
],
[
"Kim",
"Doojin",
""
],
[
"Kotwal",
"Ashutosh V.",
""
],
[
"Ricci",
"Lorenzo",
""
],
[
"Sathyan",
"Deepak",
""
]
] | We develop the idea that the unprecedented precision in Standard Model (SM) measurements, with further improvement at the HL-LHC, enables new searches for physics Beyond the Standard Model (BSM).As an illustration, we demonstrate that the measured kinematic distributions of the lepton$+MET$ final state not only determine the mass of the $W$ boson, but are also sensitive to light new physics. Such a search for new physics thus requires a simultaneous fit to the BSM and SM parameters, "unifying" searches and measurements at the LHC and Tevatron. In this paper, we complete the program initiated in our earlier work arXiv:2310.13687. In particular, we analyze ($i$) novel decay modes of the $W$ boson with a neutrinophilic invisible scalar or with a heavy neutrino; ($ii$) modified production of $W$ bosons, namely, associated with a hadrophilic invisible $Z^\prime$ gauge boson; and ($iii$) scenarios without an on-shell $W$ boson, such as slepton-sneutrino production in the Minimal Supersymmetric Standard Model (MSSM). Here, we complement our previous MSSM analysis in arXiv:2310.13687 by considering a different kinematic region. Our results highlight that new physics can still be directly discovered at the LHC, including light new physics,via SM precision measurements. Furthermore, we illustrate that such BSM signals are subtle, yet potentially large enough to affect the precision measurements of SM parameters themselves, such as the $W$ boson mass. |
hep-ph/0206018 | Chris Quigg | Estia J. Eichten, Kenneth Lane, Chris Quigg | B-Meson Gateways to Missing Charmonium Levels | 5 pages, uses ReVTeX and BibTeX | Phys.Rev.Lett.89:162002,2002 | 10.1103/PhysRevLett.89.162002 | FERMILAB-PUB-02/104-T, BUHEP-02-25 | hep-ph | null | We outline a coherent strategy for exploring the four remaining narrow
charmonium states [$\eta_{c}^{\prime}(2\slj{1}{1}{0})$,
$h_{c}(1\slj{1}{2}{1})$, $\eta_{c2}(1\slj{1}{3}{2})$, and
$\psi_{2}(1\slj{3}{3}{2})$] expected to lie below charm threshold. Produced in
$B$-meson decays, these levels should be identifiable \textit{now} via striking
radiative transitions among charmonium levels and in exclusive final states of
kaons and pions. Their production and decay rates will provide much needed new
tests for theoretical descriptions of heavy quarkonia.
| [
{
"created": "Mon, 3 Jun 2002 20:10:00 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Eichten",
"Estia J.",
""
],
[
"Lane",
"Kenneth",
""
],
[
"Quigg",
"Chris",
""
]
] | We outline a coherent strategy for exploring the four remaining narrow charmonium states [$\eta_{c}^{\prime}(2\slj{1}{1}{0})$, $h_{c}(1\slj{1}{2}{1})$, $\eta_{c2}(1\slj{1}{3}{2})$, and $\psi_{2}(1\slj{3}{3}{2})$] expected to lie below charm threshold. Produced in $B$-meson decays, these levels should be identifiable \textit{now} via striking radiative transitions among charmonium levels and in exclusive final states of kaons and pions. Their production and decay rates will provide much needed new tests for theoretical descriptions of heavy quarkonia. |
hep-ph/0609300 | Emi Kou | J.-M. Gerard and E. Kou | Anomalous enhancement of a penguin hadronic matrix element in B->K eta' | 5 pages, 1 figure | Phys.Rev.lett.97:261804,2006 | 10.1103/PhysRevLett.97.261804 | CP3-06-15 | hep-ph | null | We estimate the density matrix element for the pi^0, eta and eta' production
from the vacuum in the large-N_c limit. As a consequence, we find that the QCD
axial anomaly leads to highly non-trivial corrections to the usual flavour
SU(3) relations between B^0-> K^0 pi^0, B^0-> K^0 eta and B^0-> K^0 eta' decay
amplitudes. These corrections may explain why the B-> K eta' branching ratio is
about six times larger than the B-> K pi one.
| [
{
"created": "Thu, 28 Sep 2006 17:25:03 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Gerard",
"J. -M.",
""
],
[
"Kou",
"E.",
""
]
] | We estimate the density matrix element for the pi^0, eta and eta' production from the vacuum in the large-N_c limit. As a consequence, we find that the QCD axial anomaly leads to highly non-trivial corrections to the usual flavour SU(3) relations between B^0-> K^0 pi^0, B^0-> K^0 eta and B^0-> K^0 eta' decay amplitudes. These corrections may explain why the B-> K eta' branching ratio is about six times larger than the B-> K pi one. |
1102.2347 | Marina Nielsen | Stefano I. Finazzo, Xiang Liu, Marina Nielsen | QCD sum rule calculation for the charmonium-like structures in the J/psi
phi and J/psi omega invariant mass spectra | version to appear in Phys. Lett. B | Phys.Lett.B701:101-106,2011 | 10.1016/j.physletb.2011.05.042 | null | hep-ph hep-ex nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Using the QCD sum rules we test if the charmonium-like structure Y(4274),
observed in the $J/\psi\phi$ invariant mass spectrum, can be described with a
$D_s\bar{D}_{s0}(2317)+h.c.$ molecular current with $J^{PC}=0^{-+}$. We
consider the contributions of condensates up to dimension ten and we work at
leading order in $\alpha_s$. We keep terms which are linear in the strange
quark mass $m_s$. The mass obtained for such state is $m_{D_s{D}_{s0}}=(4.80\pm
0.55)$ GeV. We also consider a molecular $0^{-+}$ $D\bar{D}_{0}(2400)+h.c.$
current and we obtain $m_{D{D}_0}=(4.61\pm 0.71)$ GeV. Our study shows that the
newly observed Y(4274) in the $J/\psi\phi$ invariant mass spectra can be,
considering the uncertainties, described using a molecular charmonium current.
| [
{
"created": "Fri, 11 Feb 2011 13:56:17 GMT",
"version": "v1"
},
{
"created": "Mon, 16 May 2011 15:17:06 GMT",
"version": "v2"
}
] | 2015-03-18 | [
[
"Finazzo",
"Stefano I.",
""
],
[
"Liu",
"Xiang",
""
],
[
"Nielsen",
"Marina",
""
]
] | Using the QCD sum rules we test if the charmonium-like structure Y(4274), observed in the $J/\psi\phi$ invariant mass spectrum, can be described with a $D_s\bar{D}_{s0}(2317)+h.c.$ molecular current with $J^{PC}=0^{-+}$. We consider the contributions of condensates up to dimension ten and we work at leading order in $\alpha_s$. We keep terms which are linear in the strange quark mass $m_s$. The mass obtained for such state is $m_{D_s{D}_{s0}}=(4.80\pm 0.55)$ GeV. We also consider a molecular $0^{-+}$ $D\bar{D}_{0}(2400)+h.c.$ current and we obtain $m_{D{D}_0}=(4.61\pm 0.71)$ GeV. Our study shows that the newly observed Y(4274) in the $J/\psi\phi$ invariant mass spectra can be, considering the uncertainties, described using a molecular charmonium current. |
0707.1234 | Dr. Rukmani Mohanta | R. Mohanta, A. K. Giri | Unparticle effect on B_s - \bar B_s mixing and its implications for B_s
\to J/\psi \phi, \phi \phi decays | 14 pages, 4 figures, version to be published in Phys. Rev. D | Phys.Rev.D76:075015,2007 | 10.1103/PhysRevD.76.075015 | null | hep-ph | null | We study the effect of unparticle stuff on $B_s - \bar{B}_s$ mixing and
consider possible implications of it for the decaymodes $B_s \to J/\psi \phi$
and $\phi \phi$. We find that due to the new contributions from the unparticles
the $B_s - \bar{B}_s$ mixing phase could be observable at the LHC along with
the possible sizable CP asymmetry parameters $S_{\psi \phi(\phi \phi)}$ in $B_s
\to J/\psi \phi(\phi \phi)$ decay modes.
| [
{
"created": "Mon, 9 Jul 2007 12:08:02 GMT",
"version": "v1"
},
{
"created": "Tue, 17 Jul 2007 06:23:23 GMT",
"version": "v2"
},
{
"created": "Wed, 19 Sep 2007 05:57:30 GMT",
"version": "v3"
}
] | 2008-11-26 | [
[
"Mohanta",
"R.",
""
],
[
"Giri",
"A. K.",
""
]
] | We study the effect of unparticle stuff on $B_s - \bar{B}_s$ mixing and consider possible implications of it for the decaymodes $B_s \to J/\psi \phi$ and $\phi \phi$. We find that due to the new contributions from the unparticles the $B_s - \bar{B}_s$ mixing phase could be observable at the LHC along with the possible sizable CP asymmetry parameters $S_{\psi \phi(\phi \phi)}$ in $B_s \to J/\psi \phi(\phi \phi)$ decay modes. |
1111.1239 | Ben Heidenreich | Csaba Cs\'aki, Yuval Grossman, Ben Heidenreich | MFV SUSY: A Natural Theory for R-Parity Violation | 41 pages, 14 figures; v3: minor corrections, matches published
version | Phys. Rev. D 85, 095009 (2012) | 10.1103/PhysRevD.85.095009 | null | hep-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present an alternative approach to low-energy supersymmetry. Instead of
imposing R-parity we apply the minimal flavor violation (MFV) hypothesis to the
R-parity violating MSSM. In this framework, which we call MFV SUSY, squarks can
be light and the proton long lived without producing missing energy signals at
the LHC. Our approach differs from that of Nikolidakis and Smith in that we
impose holomorphy on the MFV spurions. The resulting model is highly
constrained and R-parity emerges as an accidental approximate symmetry of the
low-energy Lagrangian. The size of the small R-parity violating terms is
determined by the flavor parameters, and in the absence of neutrino masses
there is only one renormalizable R-parity violating interaction: the
baryon-number violating $\bar{u}\bar{d}\bar{d}$ superpotential term. Low energy
observables (proton decay, dinucleon decay and $n-\bar{n}$ oscillation) pose
only mild constraints on the parameter space. LHC phenomenology will depend on
whether the LSP is a squark, neutralino, chargino or slepton. If the LSP is a
squark it will have prompt decays, explaining the non-observation of events
with missing transverse energy at the LHC.
| [
{
"created": "Fri, 4 Nov 2011 20:00:13 GMT",
"version": "v1"
},
{
"created": "Wed, 21 Dec 2011 20:35:32 GMT",
"version": "v2"
},
{
"created": "Thu, 20 Sep 2012 22:42:28 GMT",
"version": "v3"
}
] | 2015-03-19 | [
[
"Csáki",
"Csaba",
""
],
[
"Grossman",
"Yuval",
""
],
[
"Heidenreich",
"Ben",
""
]
] | We present an alternative approach to low-energy supersymmetry. Instead of imposing R-parity we apply the minimal flavor violation (MFV) hypothesis to the R-parity violating MSSM. In this framework, which we call MFV SUSY, squarks can be light and the proton long lived without producing missing energy signals at the LHC. Our approach differs from that of Nikolidakis and Smith in that we impose holomorphy on the MFV spurions. The resulting model is highly constrained and R-parity emerges as an accidental approximate symmetry of the low-energy Lagrangian. The size of the small R-parity violating terms is determined by the flavor parameters, and in the absence of neutrino masses there is only one renormalizable R-parity violating interaction: the baryon-number violating $\bar{u}\bar{d}\bar{d}$ superpotential term. Low energy observables (proton decay, dinucleon decay and $n-\bar{n}$ oscillation) pose only mild constraints on the parameter space. LHC phenomenology will depend on whether the LSP is a squark, neutralino, chargino or slepton. If the LSP is a squark it will have prompt decays, explaining the non-observation of events with missing transverse energy at the LHC. |
1112.5885 | Emidio Gabrielli | Emidio Gabrielli, Antonio Racioppi, Martti Raidal | Implications of the effective axial-vector coupling of gluon on
top-quark charge asymmetry at the LHC | few small changes in the text, Fig. 2 corrected, same as published
version, 12 pages, 9 figures | Phys.Rev. D85 (2012) 074021 | 10.1103/PhysRevD.85.074021 | null | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study different top quark charge asymmetries and the variation of $t\bar
t$ total cross section induced by the effective axial-vector coupling of gluon
in the LHC experiments. We show that rapidity cut-dependent asymmetries are
more sensitive to the new physics than the independent ones. We also study the
dependence of the asymmetries and variations of total $t\bar t$ cross sections
on the invariant mass of $t\bar t$ system and show that it would be necessary
to measure those quantities as functions of $m_{tt}$ at the LHC. In the context
of considered new physics scenario, 7 TeV LHC has enough sensitivity either to
confirm the Tevatron top asymmetry anomaly or to rule it out. In the latter
case the LHC is able to put stringent constraint on the new physics scale
$\Lambda$ in this framework.
| [
{
"created": "Mon, 26 Dec 2011 19:20:26 GMT",
"version": "v1"
},
{
"created": "Fri, 13 Jul 2012 14:39:02 GMT",
"version": "v2"
}
] | 2012-07-16 | [
[
"Gabrielli",
"Emidio",
""
],
[
"Racioppi",
"Antonio",
""
],
[
"Raidal",
"Martti",
""
]
] | We study different top quark charge asymmetries and the variation of $t\bar t$ total cross section induced by the effective axial-vector coupling of gluon in the LHC experiments. We show that rapidity cut-dependent asymmetries are more sensitive to the new physics than the independent ones. We also study the dependence of the asymmetries and variations of total $t\bar t$ cross sections on the invariant mass of $t\bar t$ system and show that it would be necessary to measure those quantities as functions of $m_{tt}$ at the LHC. In the context of considered new physics scenario, 7 TeV LHC has enough sensitivity either to confirm the Tevatron top asymmetry anomaly or to rule it out. In the latter case the LHC is able to put stringent constraint on the new physics scale $\Lambda$ in this framework. |
2210.07131 | Roberta Calabrese | Giacomo Cacciapaglia, Antimo Cagnotta, Roberta Calabrese, Francesco
Carnevali, Agostino De Iorio, Alberto Orso Maria Iorio, Stefano Morisi,
Francesco Sannino | The Radiative Flavor Template at the LHC: Lepton non-universality and
g-2 | 38 pages, 60 figures, 4 tables | Phys.Rev.D 107 (2023) 5, 055033 | 10.1103/PhysRevD.107.055033 | null | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The Standard Model of Particle Physics and its description of Nature have
been recently challenged by a series of precision measurements performed via
different accelerator machines. Statistically significant anomalies emerged in
the heavy meson physics sector, when measuring the muon magnetic momentum, and
very recently when deducing the mass of the W boson. Here we consider a
radiative extension of the Standard Model devised to be sufficiently versatile
to reconcile the various experimental results while further predicting the
existence of new bosons and fermions with a mass spectrum in the TeV energy
scale. The resulting spectrum is, therefore, within the energy reach of the
proton-proton collisions at the LHC experiments at CERN. The model investigated
here allows to interpolate between composite and elementary extensions of the
Standard Model with emphasis on a new modified Yukawa sector that is needed to
accommodate the anomalies. Focusing on the radiative regime of the model, we
introduce interesting search channels of immediate impact for the ATLAS and CMS
experimental programs such as the associate production of Standard Model
particles with either invisible or long-lived particles. We further show how to
adapt earlier SUSY-motivated searchers of new physics to constrain the spectrum
and couplings of the new scalars and fermions. Overall, the new physics
template simultaneously accounts for the bulk of the observed experimental
anomalies while suggesting a wide spectrum of experimental signatures relevant
for the current LHC experiments.
| [
{
"created": "Thu, 13 Oct 2022 16:15:28 GMT",
"version": "v1"
},
{
"created": "Wed, 19 Apr 2023 16:24:35 GMT",
"version": "v2"
}
] | 2023-04-20 | [
[
"Cacciapaglia",
"Giacomo",
""
],
[
"Cagnotta",
"Antimo",
""
],
[
"Calabrese",
"Roberta",
""
],
[
"Carnevali",
"Francesco",
""
],
[
"De Iorio",
"Agostino",
""
],
[
"Iorio",
"Alberto Orso Maria",
""
],
[
"Morisi",
... | The Standard Model of Particle Physics and its description of Nature have been recently challenged by a series of precision measurements performed via different accelerator machines. Statistically significant anomalies emerged in the heavy meson physics sector, when measuring the muon magnetic momentum, and very recently when deducing the mass of the W boson. Here we consider a radiative extension of the Standard Model devised to be sufficiently versatile to reconcile the various experimental results while further predicting the existence of new bosons and fermions with a mass spectrum in the TeV energy scale. The resulting spectrum is, therefore, within the energy reach of the proton-proton collisions at the LHC experiments at CERN. The model investigated here allows to interpolate between composite and elementary extensions of the Standard Model with emphasis on a new modified Yukawa sector that is needed to accommodate the anomalies. Focusing on the radiative regime of the model, we introduce interesting search channels of immediate impact for the ATLAS and CMS experimental programs such as the associate production of Standard Model particles with either invisible or long-lived particles. We further show how to adapt earlier SUSY-motivated searchers of new physics to constrain the spectrum and couplings of the new scalars and fermions. Overall, the new physics template simultaneously accounts for the bulk of the observed experimental anomalies while suggesting a wide spectrum of experimental signatures relevant for the current LHC experiments. |
2307.02382 | Jing Song | Jing Song, L.R.Dai and E.Oset | Evolution of compact states to molecular ones with coupled channels: The
case of the $X(3872)$ | null | null | null | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the molecular probability of the $X(3872)$ in the $D^0 \bar D^{*0}$
and $D^+ D^{*-}$ channels in several scenarios. One of them assumes that the
state is purely due to a genuine nonmolecular component. However, it gets
unavoidably dressed by the meson components to the point that in the limit of
zero binding of the $D^0 \bar D^{*0}$ component becomes purely molecular. Yet,
the small but finite binding allows for a nonmolecular state when the bare mass
of the genuine state approaches the $D^0 \bar D^{*0}$ threshold, but, in this
case the system develops a small scattering length and a huge effective range
for this channel in flagrant disagreement with present values of these
magnitudes. Next we discuss the possibility to have hybrid states stemming from
the combined effect of a genuine state and a reasonable direct interaction
between the meson components, where we find cases in which the scattering
length and effective range are still compatible with data, but even then the
molecular probability is as big as $95 \%$. Finally, we perform the
calculations when the binding stems purely from the direct interaction between
the meson-meson components. In summary we conclude, that while present data
definitely rule out the possibility of a dominant nonmolecular component, the
precise value of the molecular probability requires a more precise
determination of the scattering length and effective range of the $D^0 \bar
D^{*0}$ channel, as well as the measurement of these magnitudes for the $D^+
D^{*-}$ channel which have not been determined experimentally so far.
| [
{
"created": "Wed, 5 Jul 2023 15:50:43 GMT",
"version": "v1"
},
{
"created": "Wed, 12 Jul 2023 16:31:58 GMT",
"version": "v2"
}
] | 2023-07-13 | [
[
"Song",
"Jing",
""
],
[
"Dai",
"L. R.",
""
],
[
"Oset",
"E.",
""
]
] | We study the molecular probability of the $X(3872)$ in the $D^0 \bar D^{*0}$ and $D^+ D^{*-}$ channels in several scenarios. One of them assumes that the state is purely due to a genuine nonmolecular component. However, it gets unavoidably dressed by the meson components to the point that in the limit of zero binding of the $D^0 \bar D^{*0}$ component becomes purely molecular. Yet, the small but finite binding allows for a nonmolecular state when the bare mass of the genuine state approaches the $D^0 \bar D^{*0}$ threshold, but, in this case the system develops a small scattering length and a huge effective range for this channel in flagrant disagreement with present values of these magnitudes. Next we discuss the possibility to have hybrid states stemming from the combined effect of a genuine state and a reasonable direct interaction between the meson components, where we find cases in which the scattering length and effective range are still compatible with data, but even then the molecular probability is as big as $95 \%$. Finally, we perform the calculations when the binding stems purely from the direct interaction between the meson-meson components. In summary we conclude, that while present data definitely rule out the possibility of a dominant nonmolecular component, the precise value of the molecular probability requires a more precise determination of the scattering length and effective range of the $D^0 \bar D^{*0}$ channel, as well as the measurement of these magnitudes for the $D^+ D^{*-}$ channel which have not been determined experimentally so far. |
hep-ph/0310053 | Heinrich P\"as | F. Deppisch, H. P\"as, A. Redelbach, R. R\"uckl, Y. Shimizu | The SUSY seesaw model and lepton-flavor violation at a future
electron-positron linear collider | 31 pages, 10 figures, version published in Phys. Rev. D | Phys.Rev.D69:054014,2004 | 10.1103/PhysRevD.69.054014 | WUE-ITP-2003-012 | hep-ph | null | We study lepton-flavor violating slepton production and decay at a future
e^+e^- linear collider in context with the seesaw mechanism in mSUGRA post-LEP
benchmark scenarios. The present knowledge in the neutrino sector as well as
improved future measurements are taken into account. We calculate the signal
cross-sections \sigma(e^{+/-}e^- -> l_{\beta}^{+/-} l_{\alpha}^-
\tilde{\chi}_b^0 \tilde{\chi}_a^0); l_{\delta}=e, \mu, \tau; \alpha =|= \beta
and estimate the main background processes. Furthermore, we investigate the
correlations of these signals with the corresponding lepton-flavor violating
rare decays l_{\alpha} -> l_{\beta} \gamma. It is shown that these correlations
are relatively weakly affected by uncertainties in the neutrino data, but very
sensitive to the model parameters. Hence, they are particularly suited for
probing the origin of lepton-flavor violation.
| [
{
"created": "Fri, 3 Oct 2003 17:39:00 GMT",
"version": "v1"
},
{
"created": "Tue, 7 Oct 2003 13:56:55 GMT",
"version": "v2"
},
{
"created": "Tue, 11 May 2004 16:58:54 GMT",
"version": "v3"
}
] | 2008-11-26 | [
[
"Deppisch",
"F.",
""
],
[
"Päs",
"H.",
""
],
[
"Redelbach",
"A.",
""
],
[
"Rückl",
"R.",
""
],
[
"Shimizu",
"Y.",
""
]
] | We study lepton-flavor violating slepton production and decay at a future e^+e^- linear collider in context with the seesaw mechanism in mSUGRA post-LEP benchmark scenarios. The present knowledge in the neutrino sector as well as improved future measurements are taken into account. We calculate the signal cross-sections \sigma(e^{+/-}e^- -> l_{\beta}^{+/-} l_{\alpha}^- \tilde{\chi}_b^0 \tilde{\chi}_a^0); l_{\delta}=e, \mu, \tau; \alpha =|= \beta and estimate the main background processes. Furthermore, we investigate the correlations of these signals with the corresponding lepton-flavor violating rare decays l_{\alpha} -> l_{\beta} \gamma. It is shown that these correlations are relatively weakly affected by uncertainties in the neutrino data, but very sensitive to the model parameters. Hence, they are particularly suited for probing the origin of lepton-flavor violation. |
hep-ph/0607231 | Masafumi Kurachi | Masafumi Kurachi, Robert Shrock | Behavior of the S Parameter in the Crossover Region Between Walking and
QCD-Like Regimes of an SU(N) Gauge Theory | 14 pages, 4 figures | Phys.Rev.D74:056003,2006 | 10.1103/PhysRevD.74.056003 | YITP-SB-06-32 | hep-ph | null | We consider a vectorial, confining SU(N) gauge theory with a variable number,
$N_f$, of massless fermions transforming according to the fundamental
representation. Using the Schwinger-Dyson and Bethe-Salpeter equations, we
calculate the $S$ parameter in terms of the current-current correlation
functions. We focus on values of $N_f$ such that the theory is in the crossover
region between the regimes of walking behavior and QCD-like (non-walking)
behavior. Our calculations indicate that the contribution to $S$ from a given
fermion decreases as one moves from the QCD-like to the walking regimes. The
implications of this result for technicolor theories are discussed.
| [
{
"created": "Thu, 20 Jul 2006 18:54:04 GMT",
"version": "v1"
}
] | 2011-07-19 | [
[
"Kurachi",
"Masafumi",
""
],
[
"Shrock",
"Robert",
""
]
] | We consider a vectorial, confining SU(N) gauge theory with a variable number, $N_f$, of massless fermions transforming according to the fundamental representation. Using the Schwinger-Dyson and Bethe-Salpeter equations, we calculate the $S$ parameter in terms of the current-current correlation functions. We focus on values of $N_f$ such that the theory is in the crossover region between the regimes of walking behavior and QCD-like (non-walking) behavior. Our calculations indicate that the contribution to $S$ from a given fermion decreases as one moves from the QCD-like to the walking regimes. The implications of this result for technicolor theories are discussed. |
2202.04704 | Manoranjan Dutta | Manoranjan Dutta (1), Nimmala Narendra (2), Narendra Sahu (1), Sujay
Shil (3,4,5) ((1) Indian Institute of Technology Hyderabad, (2) Physical
Research Laboratory Ahmedabad, (3) Indian Institute of Technology
Gandhinagar, (4) Institute of Physics, Bhubaneswar, (5) Homi Bhabha National
Institute, Mumbai) | Asymmetric Self-interacting Dark Matter via Dirac Leptogenesis | 17 pages, 10 captioned figures, Version accepted for publication in
PRD | null | 10.1103/PhysRevD.106.095017 | null | hep-ph astro-ph.CO | http://creativecommons.org/licenses/by/4.0/ | The nature of neutrinos, whether Dirac or Majorana, is hitherto not known.
Assuming that the neutrinos are Dirac, which needs $B-L$ to be an exact
symmetry, we make an attempt to explain the observed proportionality between
the relic densities of dark matter (DM) and baryonic matter in the present
Universe ${\it i.e.,}\,\, \Omega_{\rm DM} \approx 5\, \Omega_{\rm B}$. Assuming
the existence of heavy $SU(2)_L$ scalar doublet $(X= (X^0, X^-)^T)$ in the
early Universe, an equal and opposite $B-L$ asymmetry can be generated in left
and right-handed sectors by the CP-violating out-of-equilibrium decay $X^0 \to
\nu_L \nu_R$ since $B-L$ is an exact symmetry. We ensure that $\nu_L-\nu_R$
equilibration does not occur until below the electroweak (EW) phase transition
during which a part of the lepton asymmetry gets converted to dark matter
asymmetry through a dimension eight operator, which conserves $B-L$ symmetry
and is in thermal equilibrium. The remaining $B-L$ asymmetry then gets
converted to a net B-asymmetry through EW-sphalerons which are active at a
temperature above 100 GeV. To alleviate the small-scale anomalies of
$\Lambda$CDM, we assume the DM to be self-interacting via a light mediator,
which not only depletes the symmetric component of the DM, but also paves a way
to detect the DM at terrestrial laboratories through scalar portal mixing.
| [
{
"created": "Wed, 9 Feb 2022 19:57:16 GMT",
"version": "v1"
},
{
"created": "Sun, 23 Oct 2022 06:01:03 GMT",
"version": "v2"
}
] | 2022-11-30 | [
[
"Dutta",
"Manoranjan",
""
],
[
"Narendra",
"Nimmala",
""
],
[
"Sahu",
"Narendra",
""
],
[
"Shil",
"Sujay",
""
]
] | The nature of neutrinos, whether Dirac or Majorana, is hitherto not known. Assuming that the neutrinos are Dirac, which needs $B-L$ to be an exact symmetry, we make an attempt to explain the observed proportionality between the relic densities of dark matter (DM) and baryonic matter in the present Universe ${\it i.e.,}\,\, \Omega_{\rm DM} \approx 5\, \Omega_{\rm B}$. Assuming the existence of heavy $SU(2)_L$ scalar doublet $(X= (X^0, X^-)^T)$ in the early Universe, an equal and opposite $B-L$ asymmetry can be generated in left and right-handed sectors by the CP-violating out-of-equilibrium decay $X^0 \to \nu_L \nu_R$ since $B-L$ is an exact symmetry. We ensure that $\nu_L-\nu_R$ equilibration does not occur until below the electroweak (EW) phase transition during which a part of the lepton asymmetry gets converted to dark matter asymmetry through a dimension eight operator, which conserves $B-L$ symmetry and is in thermal equilibrium. The remaining $B-L$ asymmetry then gets converted to a net B-asymmetry through EW-sphalerons which are active at a temperature above 100 GeV. To alleviate the small-scale anomalies of $\Lambda$CDM, we assume the DM to be self-interacting via a light mediator, which not only depletes the symmetric component of the DM, but also paves a way to detect the DM at terrestrial laboratories through scalar portal mixing. |
2007.04400 | Mauro Valli | Lina Alasfar, Aleksandr Azatov, Jorge de Blas, Ayan Paul and Mauro
Valli | $B$ anomalies under the lens of electroweak precision | 35 pages, 9 figures, 1 table. Some references added. Matching
published version | null | 10.1007/JHEP12(2020)016 | DESY 20-091, HU-EP-20/12-RTG, SISSA 16/2020/FISI, UCI-TR 2020-10 | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The measurements carried out at LEP and SLC projected us into the precision
era of electroweak physics. This has also been relevant in the theoretical
interpretation of LHCb and Belle measurements of rare $B$ semileptonic decays,
paving the road for new physics with the inference of lepton universality
violation in $R_{K^{(*)}}$ ratios. The simplest explanation of these flavour
anomalies -- sizeable one-loop contributions respecting Minimal Flavour
Violation -- is currently disfavoured by electroweak precision data. In this
work, we discuss how to completely relieve the present tension between
electroweak constraints and one-loop minimal flavour violating solutions to
$R_{K^{(*)}}$. We determine the correlations in the Standard Model Effective
Field Theory that highlight the existence of such a possibility. Then, we
consider minimal extensions of the Standard Model where our
effective-field-theory picture can be realized. We discuss how these solutions
to $b \to s \ell \ell$ anomalies, respecting electroweak precision and without
any new source of flavour violation, may point to the existence of a
$Z^{\prime}$ boson at around the TeV scale, within the discovery potential of
LHC, or to leptoquark scenarios.
| [
{
"created": "Wed, 8 Jul 2020 20:02:15 GMT",
"version": "v1"
},
{
"created": "Thu, 4 Feb 2021 09:23:54 GMT",
"version": "v2"
}
] | 2021-02-05 | [
[
"Alasfar",
"Lina",
""
],
[
"Azatov",
"Aleksandr",
""
],
[
"de Blas",
"Jorge",
""
],
[
"Paul",
"Ayan",
""
],
[
"Valli",
"Mauro",
""
]
] | The measurements carried out at LEP and SLC projected us into the precision era of electroweak physics. This has also been relevant in the theoretical interpretation of LHCb and Belle measurements of rare $B$ semileptonic decays, paving the road for new physics with the inference of lepton universality violation in $R_{K^{(*)}}$ ratios. The simplest explanation of these flavour anomalies -- sizeable one-loop contributions respecting Minimal Flavour Violation -- is currently disfavoured by electroweak precision data. In this work, we discuss how to completely relieve the present tension between electroweak constraints and one-loop minimal flavour violating solutions to $R_{K^{(*)}}$. We determine the correlations in the Standard Model Effective Field Theory that highlight the existence of such a possibility. Then, we consider minimal extensions of the Standard Model where our effective-field-theory picture can be realized. We discuss how these solutions to $b \to s \ell \ell$ anomalies, respecting electroweak precision and without any new source of flavour violation, may point to the existence of a $Z^{\prime}$ boson at around the TeV scale, within the discovery potential of LHC, or to leptoquark scenarios. |
1703.09065 | Massimiliano Grazzini | Massimiliano Grazzini, Stefan Kallweit, Dirk Rathlev, Marius Wiesemann | $W^\pm Z$ production at the LHC: fiducial cross sections and
distributions in NNLO QCD | 38 pages, 18 figures, 8 tables | null | 10.1007/JHEP05(2017)139 | ZU-TH 06/17, CERN-TH-2017-065 | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We report on the first fully differential calculation for $W^\pm Z$
production in hadron collisions up to next-to-next-to-leading order (NNLO) in
QCD perturbation theory. Leptonic decays of the $W$ and $Z$ bosons are
consistently taken into account, i.e. we include all resonant and non-resonant
diagrams that contribute to the process $pp\to \ell^{'\pm} \nu_{\ell^{'}}
\ell^+\ell^-+X$ both in the same-flavour ($\ell'=\ell$) and the
different-flavour ($\ell'\neq \ell$) channel. Fiducial cross sections and
distributions are presented in the presence of standard selection cuts applied
in the experimental $W^\pm Z$ analyses by ATLAS and CMS at centre-of-mass
energies of 8 and 13\,TeV. As previously shown for the inclusive cross section,
NNLO corrections increase the NLO result by about $10\%$, thereby leading to an
improved agreement with experimental data. The importance of NNLO accurate
predictions is also shown in the case of new-physics scenarios, where,
especially in high-$p_T$ categories, their impact can reach ${\cal O}(20\%)$.
The availability of differential NNLO predictions will play a crucial role in
the rich physics programme that is based on precision studies of $W^\pm Z$
signatures at the LHC.
| [
{
"created": "Mon, 27 Mar 2017 13:37:03 GMT",
"version": "v1"
}
] | 2017-09-13 | [
[
"Grazzini",
"Massimiliano",
""
],
[
"Kallweit",
"Stefan",
""
],
[
"Rathlev",
"Dirk",
""
],
[
"Wiesemann",
"Marius",
""
]
] | We report on the first fully differential calculation for $W^\pm Z$ production in hadron collisions up to next-to-next-to-leading order (NNLO) in QCD perturbation theory. Leptonic decays of the $W$ and $Z$ bosons are consistently taken into account, i.e. we include all resonant and non-resonant diagrams that contribute to the process $pp\to \ell^{'\pm} \nu_{\ell^{'}} \ell^+\ell^-+X$ both in the same-flavour ($\ell'=\ell$) and the different-flavour ($\ell'\neq \ell$) channel. Fiducial cross sections and distributions are presented in the presence of standard selection cuts applied in the experimental $W^\pm Z$ analyses by ATLAS and CMS at centre-of-mass energies of 8 and 13\,TeV. As previously shown for the inclusive cross section, NNLO corrections increase the NLO result by about $10\%$, thereby leading to an improved agreement with experimental data. The importance of NNLO accurate predictions is also shown in the case of new-physics scenarios, where, especially in high-$p_T$ categories, their impact can reach ${\cal O}(20\%)$. The availability of differential NNLO predictions will play a crucial role in the rich physics programme that is based on precision studies of $W^\pm Z$ signatures at the LHC. |
hep-ph/9612294 | ChangMoh kim | Seung Woo Ham, Sun Kun Oh, and Bjong Ro Kim | Experimental constraints on the parameter space of the next-to-minimal
supersymmetric standard model at LEP 2 | 14 pages (3 figures are included) | Phys.Lett. B414 (1997) 305-314 | 10.1016/S0370-2693(97)01175-1 | KKUCC-96-3 | hep-ph | null | We search for the neutral Higgs sector of the next-to-minimal supersymmetric
standard model at LEP 2. At the tree level any experimental constraints on
$\tan \beta$ cannot be set by the Higgs search at LEP 2 with $\sqrt{s}$ = 175
GeV, whereas at LEP 2 with $\sqrt{s}$ = 192 GeV $\tan \beta$ can be set by an
experimental constraint. Furthermore the tree level parameter space of the
model can be completely explored by the Higgs search at LEP 2 with $\sqrt{s}$ =
205 GeV. Radiative corrections both to the neutral Higgs boson masses and to
the relevant couplings for the scalar Higgs productions give large
contributions to the production cross sections of the scalar Higgs bosons at
the tree level. The tree level situation at LEP 2 with $\sqrt{s}$ = 192 GeV as
well as with $\sqrt{s}$ = 205 GeV can be drastically changed by these effects.
We expect that a small region of the 1-loop level parameter space of the model
via the scalar Higgs production can be explored by the Higgs search at LEP 2.
| [
{
"created": "Mon, 9 Dec 1996 05:45:28 GMT",
"version": "v1"
}
] | 2009-10-30 | [
[
"Ham",
"Seung Woo",
""
],
[
"Oh",
"Sun Kun",
""
],
[
"Kim",
"Bjong Ro",
""
]
] | We search for the neutral Higgs sector of the next-to-minimal supersymmetric standard model at LEP 2. At the tree level any experimental constraints on $\tan \beta$ cannot be set by the Higgs search at LEP 2 with $\sqrt{s}$ = 175 GeV, whereas at LEP 2 with $\sqrt{s}$ = 192 GeV $\tan \beta$ can be set by an experimental constraint. Furthermore the tree level parameter space of the model can be completely explored by the Higgs search at LEP 2 with $\sqrt{s}$ = 205 GeV. Radiative corrections both to the neutral Higgs boson masses and to the relevant couplings for the scalar Higgs productions give large contributions to the production cross sections of the scalar Higgs bosons at the tree level. The tree level situation at LEP 2 with $\sqrt{s}$ = 192 GeV as well as with $\sqrt{s}$ = 205 GeV can be drastically changed by these effects. We expect that a small region of the 1-loop level parameter space of the model via the scalar Higgs production can be explored by the Higgs search at LEP 2. |
1406.7837 | Stefan Liebler | Asma Cheriguene, Stefan Liebler, Werner Porod | CP violation in bilinear R-parity violation and its consequences for the
early universe | 26 pages, 13 figures | Phys. Rev. D 90, 055012 (2014) | 10.1103/PhysRevD.90.055012 | DESY 14-109 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Supersymmetric models with bilinear R-parity violation (BRpV) provide a
framework for neutrino masses and mixing angles to explain neutrino oscillation
data. We consider CP violation within the new physical phases in BRpV and
discuss their effect on the generation of neutrino masses and the decays of the
lightest supersymmetric particle (LSP), being a light neutralino with mass
$\sim 100$ GeV, at next-to-leading order. The decays affect the lepton and via
sphaleron transitions the baryon asymmetry in the early universe. For a rather
light LSP, asymmetries generated before the electroweak phase transition via
e.g. the Affleck-Dine mechanism are reduced up to two orders of magnitude, but
are still present. On the other hand, the decays of a light LSP themselves can
account for the generation of a lepton and baryon asymmetry, the latter in
accordance to the observation in our universe, since the smallness of the BRpV
parameters allows for an out-of-equilibrium decay and sufficiently large CP
violation is possible consistent with experimental bounds from the
non-observation of electric dipole-moments.
| [
{
"created": "Mon, 30 Jun 2014 18:10:54 GMT",
"version": "v1"
}
] | 2014-09-17 | [
[
"Cheriguene",
"Asma",
""
],
[
"Liebler",
"Stefan",
""
],
[
"Porod",
"Werner",
""
]
] | Supersymmetric models with bilinear R-parity violation (BRpV) provide a framework for neutrino masses and mixing angles to explain neutrino oscillation data. We consider CP violation within the new physical phases in BRpV and discuss their effect on the generation of neutrino masses and the decays of the lightest supersymmetric particle (LSP), being a light neutralino with mass $\sim 100$ GeV, at next-to-leading order. The decays affect the lepton and via sphaleron transitions the baryon asymmetry in the early universe. For a rather light LSP, asymmetries generated before the electroweak phase transition via e.g. the Affleck-Dine mechanism are reduced up to two orders of magnitude, but are still present. On the other hand, the decays of a light LSP themselves can account for the generation of a lepton and baryon asymmetry, the latter in accordance to the observation in our universe, since the smallness of the BRpV parameters allows for an out-of-equilibrium decay and sufficiently large CP violation is possible consistent with experimental bounds from the non-observation of electric dipole-moments. |
0805.2291 | B. L. G. Bakker | A. M. Badalian, B. L. G. Bakker, I. V. Danilkin | The $\mathbf{S}-\mathbf{D}$ mixing and di-electron widths of higher
charmonium $\mathbf{1^{--}}$ states | 19 pages, no figures | Phys.Atom.Nucl.72:638-646,2009 | 10.1134/S1063778809040085 | null | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The di-electron widths of $\psi(4040)$, $\psi(4160)$, and $\psi(4415)$, and
their ratios are shown to be in good agreement with experiment, if in all cases
the $S-D$ mixing with a large mixing angle $\theta\approx 34^\circ$ is taken.
Arguments are presented why continuum states give small contributions to the
wave functions at the origin. We find that the Y(4360) resonance, considered as
a pure $3 {}^3D_1$ state, would have very small di-electron width,
$\Gamma_{ee}(Y(4360))=0.060$ keV. On the contrary, for large mixing between the
$4 {}^3S_1$ and $3 {}^3D_1$ states with the mixing angle $\theta=34.8^\circ$,
$\Gamma_{ee}(\psi(4415))=0.57$ keV coincides with the experimental number,
while a second physical resonance, probably Y(4360), has also a rather large
$\Gamma_{ee} (Y(\sim 4400))=0.61$ keV. For the higher resonance Y(4660),
considered as a pure $5 {}^3S_1$ state, we predict the di-electron width
$\Gamma_{ee}(Y(4660))=0.70$ keV, but it becomes significantly smaller, namely
0.31 keV, if the mixing angle between the $5 {}^3S_1$ and $4 {}^3D_1$ states
$\theta=34^\circ$. The mass and di-electron width of the $6 {}^3S_1$ charmonium
state are calculated.
| [
{
"created": "Thu, 15 May 2008 12:57:42 GMT",
"version": "v1"
},
{
"created": "Mon, 2 Feb 2009 09:27:48 GMT",
"version": "v2"
}
] | 2009-05-12 | [
[
"Badalian",
"A. M.",
""
],
[
"Bakker",
"B. L. G.",
""
],
[
"Danilkin",
"I. V.",
""
]
] | The di-electron widths of $\psi(4040)$, $\psi(4160)$, and $\psi(4415)$, and their ratios are shown to be in good agreement with experiment, if in all cases the $S-D$ mixing with a large mixing angle $\theta\approx 34^\circ$ is taken. Arguments are presented why continuum states give small contributions to the wave functions at the origin. We find that the Y(4360) resonance, considered as a pure $3 {}^3D_1$ state, would have very small di-electron width, $\Gamma_{ee}(Y(4360))=0.060$ keV. On the contrary, for large mixing between the $4 {}^3S_1$ and $3 {}^3D_1$ states with the mixing angle $\theta=34.8^\circ$, $\Gamma_{ee}(\psi(4415))=0.57$ keV coincides with the experimental number, while a second physical resonance, probably Y(4360), has also a rather large $\Gamma_{ee} (Y(\sim 4400))=0.61$ keV. For the higher resonance Y(4660), considered as a pure $5 {}^3S_1$ state, we predict the di-electron width $\Gamma_{ee}(Y(4660))=0.70$ keV, but it becomes significantly smaller, namely 0.31 keV, if the mixing angle between the $5 {}^3S_1$ and $4 {}^3D_1$ states $\theta=34^\circ$. The mass and di-electron width of the $6 {}^3S_1$ charmonium state are calculated. |
2312.12799 | N Furey | N. Furey | An Algebraic Roadmap of Particle Theories, Part II: Theoretical
checkpoints | 6 pages, 1 figure, Second paper in a series. Follows arXiv:2312.12377 | null | null | HU-EP-23/65 | hep-ph hep-th | http://creativecommons.org/licenses/by/4.0/ | An optimal algebraic model of particle physics has a number of checkpoints to
pass. As a minimum, models should $\langle 1 \rangle$ conform to the
Coleman-Mandula theorem (or establish a loophole), $\langle 2 \rangle$ evade
familiar fermion doubling problems, $\langle 3 \rangle$ naturally explain the
Standard Model's chirality, $\langle 4 \rangle$ exclude B-L gauge symmetry at
low energy, and $\langle 5 \rangle$ explain the existence of three generations.
We demonstrate how the model introduced in [1] passes checkpoints $\langle 1
\rangle, \langle 2 \rangle, \langle 3 \rangle, \langle 4 \rangle$, and has yet
to cross $\langle 5 \rangle$. We close by elucidating an unexpected appearance
of spacetime symmetries.
| [
{
"created": "Wed, 20 Dec 2023 06:40:31 GMT",
"version": "v1"
}
] | 2023-12-21 | [
[
"Furey",
"N.",
""
]
] | An optimal algebraic model of particle physics has a number of checkpoints to pass. As a minimum, models should $\langle 1 \rangle$ conform to the Coleman-Mandula theorem (or establish a loophole), $\langle 2 \rangle$ evade familiar fermion doubling problems, $\langle 3 \rangle$ naturally explain the Standard Model's chirality, $\langle 4 \rangle$ exclude B-L gauge symmetry at low energy, and $\langle 5 \rangle$ explain the existence of three generations. We demonstrate how the model introduced in [1] passes checkpoints $\langle 1 \rangle, \langle 2 \rangle, \langle 3 \rangle, \langle 4 \rangle$, and has yet to cross $\langle 5 \rangle$. We close by elucidating an unexpected appearance of spacetime symmetries. |
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