id stringlengths 9 14 | submitter stringlengths 1 56 ⌀ | authors stringlengths 5 7.68k | title stringlengths 3 299 | comments stringlengths 1 1.15k ⌀ | journal-ref stringlengths 9 298 ⌀ | doi stringlengths 12 97 ⌀ | report-no stringlengths 3 341 ⌀ | categories stringclasses 869 values | license stringclasses 9 values | orig_abstract stringlengths 16 2.44k | versions listlengths 1 39 | update_date stringlengths 10 10 | authors_parsed listlengths 1 565 | abstract stringlengths 13 2.44k |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
hep-ph/0407190 | Georg Weiglein | M. D"uhrssen, S. Heinemeyer, H. Logan, D. Rainwater, G. Weiglein and
D. Zeppenfeld | Determination of Higgs-boson couplings at the LHC | 9 pages, contribution to the proceedings of the XXXIXth Rencontres de
Moriond, La Thuile, March 2004 | null | null | DCPT/04/58, IPPP/04/29 | hep-ph | null | We investigate the determination of Higgs boson couplings to gauge bosons and
fermions at the LHC from data on Higgs boson production and decay. We
demonstrate that very mild theoretical assumptions, which are valid in general
multi-Higgs doublet models, are sufficient to allow the extraction of absolute
values of the couplings rather than just ratios of the couplings. For Higgs
masses below 200 GeV we find accuracies of 10-40% for the Higgs couplings and
the total Higgs boson width after several years of LHC running. The sensitivity
of the Higgs coupling measurements to deviations from the Standard Model
predictions is studied for an MSSM scenario.
| [
{
"created": "Fri, 16 Jul 2004 12:32:35 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"D\"uhrssen",
"M.",
""
],
[
"Heinemeyer",
"S.",
""
],
[
"Logan",
"H.",
""
],
[
"Rainwater",
"D.",
""
],
[
"Weiglein",
"G.",
""
],
[
"Zeppenfeld",
"D.",
""
]
] | We investigate the determination of Higgs boson couplings to gauge bosons and fermions at the LHC from data on Higgs boson production and decay. We demonstrate that very mild theoretical assumptions, which are valid in general multi-Higgs doublet models, are sufficient to allow the extraction of absolute values of the couplings rather than just ratios of the couplings. For Higgs masses below 200 GeV we find accuracies of 10-40% for the Higgs couplings and the total Higgs boson width after several years of LHC running. The sensitivity of the Higgs coupling measurements to deviations from the Standard Model predictions is studied for an MSSM scenario. |
1906.07821 | Marco Arroyo | M. A. Arroyo-Ure\~na, A. Fern\'andez-T\'ellez and G. Tavares-Velasco | Flavor changing Flavon decay $\phi\to tc$ ($\phi=H_F,\,A_F$) at the High
Luminosity Large Hadron Collider | Substantial changes to the previous version | null | null | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present a study of the flavor changing decays $\phi\to tc$
($\phi=H_F,\,A_F$) of the $CP$-even and $CP$-odd scalar flavons at the large
hadron collider and its next stage, the high-luminosity large hadron collider.
The theoretical framework is an extension of the standard model that
incorporates an extra complex singlet and invokes the Froggatt-Nielsen
mechanism with an Abelian flavor symmetry. The projected exclusion and
discovery regions in terms of the model parameters are reported. We find that
$A_F$ could be detected at the LHC by considering a reasonable scenario of the
model parameter space. As far as $H_F$ is concerned, we also found promising
results that could be verified experimentally at the high-luminosity LHC.
| [
{
"created": "Tue, 18 Jun 2019 21:41:13 GMT",
"version": "v1"
},
{
"created": "Thu, 11 Aug 2022 17:28:23 GMT",
"version": "v2"
}
] | 2022-08-12 | [
[
"Arroyo-Ureña",
"M. A.",
""
],
[
"Fernández-Téllez",
"A.",
""
],
[
"Tavares-Velasco",
"G.",
""
]
] | We present a study of the flavor changing decays $\phi\to tc$ ($\phi=H_F,\,A_F$) of the $CP$-even and $CP$-odd scalar flavons at the large hadron collider and its next stage, the high-luminosity large hadron collider. The theoretical framework is an extension of the standard model that incorporates an extra complex singlet and invokes the Froggatt-Nielsen mechanism with an Abelian flavor symmetry. The projected exclusion and discovery regions in terms of the model parameters are reported. We find that $A_F$ could be detected at the LHC by considering a reasonable scenario of the model parameter space. As far as $H_F$ is concerned, we also found promising results that could be verified experimentally at the high-luminosity LHC. |
hep-ph/9606217 | Enomoto | Ryoji Enomoto and Masaharu Tanabashi | Direct CP violation of B meson via rho-omega interference | 18 pages, latex (revtex), two figures, two citations changed,
available at http://bsun01.kek.jp/~enomoto/rhoomega.ps | Phys.Lett. B386 (1996) 413-421 | 10.1016/0370-2693(96)00979-3 | KEK preprint 96-33, KEK TH-476, FERMILAB-PUB-96/130-T | hep-ph hep-ex | null | We investigate $B^{\pm,0}\rightarrow \rho^0 (\omega )h^{\pm,0}$, where
$\rho^0 (\omega)$ decays to $\pi^+\pi^-$ and $h$ is any hadronic final states,
such as $\pi$ or $K$. We find large direct $CP$ asymmetries via $\rho-\omega$
interference. A possible determination of the weak phases, such as $\phi_2={\rm
arg}((V_{ud}V^*_{ub})/(V_{td}V^*_{tb}))$ and $\phi_3={\rm
arg}((V_{us}V^*_{ub})/(V_{ts}V^*_{tb}))$, is also discussed. We show the
feasibility to detect the CP asymmetries in these channels by assuming an
asymmetric $e^+e^-$ collider experiment. $10^{9}$ $B\bar B$ events are required
for the detection of this effect.
| [
{
"created": "Tue, 4 Jun 1996 06:27:23 GMT",
"version": "v1"
},
{
"created": "Wed, 12 Jun 1996 23:57:58 GMT",
"version": "v2"
}
] | 2009-10-28 | [
[
"Enomoto",
"Ryoji",
""
],
[
"Tanabashi",
"Masaharu",
""
]
] | We investigate $B^{\pm,0}\rightarrow \rho^0 (\omega )h^{\pm,0}$, where $\rho^0 (\omega)$ decays to $\pi^+\pi^-$ and $h$ is any hadronic final states, such as $\pi$ or $K$. We find large direct $CP$ asymmetries via $\rho-\omega$ interference. A possible determination of the weak phases, such as $\phi_2={\rm arg}((V_{ud}V^*_{ub})/(V_{td}V^*_{tb}))$ and $\phi_3={\rm arg}((V_{us}V^*_{ub})/(V_{ts}V^*_{tb}))$, is also discussed. We show the feasibility to detect the CP asymmetries in these channels by assuming an asymmetric $e^+e^-$ collider experiment. $10^{9}$ $B\bar B$ events are required for the detection of this effect. |
1907.07383 | Sang Hui Im | Sang Hui Im, Kwang Sik Jeong | Freeze-in Axion-like Dark Matter | 1+14 pages; v2: updated ALP longevity bound from gamma ray
observations, references added, version to appear in PLB | Phys. Lett. B 799 (2019) 135044 | 10.1016/j.physletb.2019.135044 | PNUTP-19-A13 | hep-ph astro-ph.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present an interesting Higgs portal model where an axion-like particle
(ALP) couples to the Standard Model sector only via the Higgs field. The ALP
becomes stable due to CP invariance and turns out to be a natural candidate for
freeze-in dark matter because its properties are controlled by the perturbative
ALP shift symmetry. The portal coupling can be generated non-perturbatively by
a hidden confining gauge sector, or radiatively by new leptons charged under
the ALP shift symmetry. Such UV completions generally involve a CP violating
phase, which makes the ALP unstable and decay through mixing with the Higgs
boson, but can be sufficiently suppressed in a natural way by invoking
additional symmetries.
| [
{
"created": "Wed, 17 Jul 2019 08:33:02 GMT",
"version": "v1"
},
{
"created": "Tue, 29 Oct 2019 08:53:54 GMT",
"version": "v2"
}
] | 2019-11-07 | [
[
"Im",
"Sang Hui",
""
],
[
"Jeong",
"Kwang Sik",
""
]
] | We present an interesting Higgs portal model where an axion-like particle (ALP) couples to the Standard Model sector only via the Higgs field. The ALP becomes stable due to CP invariance and turns out to be a natural candidate for freeze-in dark matter because its properties are controlled by the perturbative ALP shift symmetry. The portal coupling can be generated non-perturbatively by a hidden confining gauge sector, or radiatively by new leptons charged under the ALP shift symmetry. Such UV completions generally involve a CP violating phase, which makes the ALP unstable and decay through mixing with the Higgs boson, but can be sufficiently suppressed in a natural way by invoking additional symmetries. |
hep-ph/9610317 | Terry Goldman | G. J. Stephenson Jr. (UNM), T. Goldman (LANL) and B. H. J. McKellar
(Melbourne) | MSW-like Enhancements without Matter | 9 pages, latex, 1 figure | Mod.Phys.Lett.A12:2391-2398,1997 | 10.1142/S021773239700248X | LA-UR-96-2956 | hep-ph | null | We study the effects of a scalar field, coupled only to neutrinos, on
oscillations among weak interaction current eigenstates. The effect of a real
scalar field appears as effective masses for the neutrino mass eigenstates, the
same for $\nbar$ as for $\n$. Under some conditions, this can lead to a
vanishing of $\delta m^2$, giving rise to MSW-like effects. We discuss some
examples and show that it is possible to resolve the apparent discrepancy in
spectra required by r-process nucleosynthesis in the mantles of supernovae and
by Solar neutrino solutions.
| [
{
"created": "Thu, 10 Oct 1996 19:25:12 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Stephenson",
"G. J.",
"Jr.",
"UNM"
],
[
"Goldman",
"T.",
"",
"LANL"
],
[
"McKellar",
"B. H. J.",
"",
"Melbourne"
]
] | We study the effects of a scalar field, coupled only to neutrinos, on oscillations among weak interaction current eigenstates. The effect of a real scalar field appears as effective masses for the neutrino mass eigenstates, the same for $\nbar$ as for $\n$. Under some conditions, this can lead to a vanishing of $\delta m^2$, giving rise to MSW-like effects. We discuss some examples and show that it is possible to resolve the apparent discrepancy in spectra required by r-process nucleosynthesis in the mantles of supernovae and by Solar neutrino solutions. |
1907.06957 | Mario Prausa | Robert V. Harlander, Mario Prausa, Johann Usovitsch | The light-fermion contribution to the exact Higgs-gluon form factor in
QCD | matches published version, including (forthcoming) erratum | JHEP10(2019)148 | 10.1007/JHEP10(2019)148 | TTK-19-26, P3H-19-021, FR-PHENO-2019-011 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | An analytical expression for the three-loop form factors for $ggH$ and
$\gamma\gamma H$ is derived for the contributions which involve massless quark
loops. The result is expressed in terms of harmonic polylogarithms. It fully
agrees with previously obtained kinematical expansions, and confirms a recent
semi-numerical approximation which extends over the full kinematic range.
| [
{
"created": "Tue, 16 Jul 2019 12:22:40 GMT",
"version": "v1"
},
{
"created": "Wed, 9 Oct 2019 15:14:32 GMT",
"version": "v2"
},
{
"created": "Wed, 22 Jul 2020 11:14:52 GMT",
"version": "v3"
}
] | 2020-07-23 | [
[
"Harlander",
"Robert V.",
""
],
[
"Prausa",
"Mario",
""
],
[
"Usovitsch",
"Johann",
""
]
] | An analytical expression for the three-loop form factors for $ggH$ and $\gamma\gamma H$ is derived for the contributions which involve massless quark loops. The result is expressed in terms of harmonic polylogarithms. It fully agrees with previously obtained kinematical expansions, and confirms a recent semi-numerical approximation which extends over the full kinematic range. |
1005.3724 | C. A. Dominguez | C. A. Dominguez | Determination of light quark masses in QCD | Plenary talk at the Conference in honour of Murray Gell-Mann's 80th
birthday, Nanyang Technical University, Singapore, February 2010. To be
published in the proceedings (Mod. Phys. Lett. A). This talk is based on work
done in collaboration with N. F. Nasrallah, R. H. R\"ontsch, and K. Schilcher | Int.J.Mod.Phys.A25:5223-5234,2010 | 10.1142/S0217751X10051116 | UCT-TP-280/2010 | hep-ph hep-lat | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The standard procedure to determine (analytically) the values of the quark
masses is to relate QCD two-point functions to experimental data in the
framework of QCD sum rules. In the case of the light quark sector, the ideal
Green function is the pseudoscalar correlator which involves the quark masses
as an overall multiplicative factor. For the past thirty years this method has
been affected by systematic uncertainties originating in the hadronic resonance
sector, thus limiting the accuracy of the results. Recently, a major
breakthrough has been made allowing for a considerable reduction of these
systematic uncertainties and leading to light quark masses accurate to better
than 8%. This procedure will be described in this talk for the up-, down-,
strange-quark masses, after a general introduction to the method of QCD sum
rules.
| [
{
"created": "Thu, 20 May 2010 15:00:55 GMT",
"version": "v1"
}
] | 2010-11-23 | [
[
"Dominguez",
"C. A.",
""
]
] | The standard procedure to determine (analytically) the values of the quark masses is to relate QCD two-point functions to experimental data in the framework of QCD sum rules. In the case of the light quark sector, the ideal Green function is the pseudoscalar correlator which involves the quark masses as an overall multiplicative factor. For the past thirty years this method has been affected by systematic uncertainties originating in the hadronic resonance sector, thus limiting the accuracy of the results. Recently, a major breakthrough has been made allowing for a considerable reduction of these systematic uncertainties and leading to light quark masses accurate to better than 8%. This procedure will be described in this talk for the up-, down-, strange-quark masses, after a general introduction to the method of QCD sum rules. |
hep-ph/0303025 | David Akers | David Akers | Evidence for Magnetic Fields in Light Meson Spectra | PDF only, 24 pages with 14 figures, minor changes, one new figure | null | null | null | hep-ph | null | Mac Gregor's constituent-quark model is reviewed with currently published
data from light meson spectroscopy. It was previously shown that magnetic
sources were responsible for the quantization of several mass-splittings in Mac
Gregor's model. The existence of a 70-MeV quantum was postulated by Mac Gregor
and was shown to fit the Nambu empirical mass formula mn = (n/2)137me, n a
positive integer. It is shown in this paper that the light meson spectra also
fit into the constituent-quark model and are in agreement with the
Russell-Saunders coupling scheme. The existence of magnetic fields is suggested
by the successful accounting of these meson spectra.
| [
{
"created": "Tue, 4 Mar 2003 20:22:13 GMT",
"version": "v1"
},
{
"created": "Fri, 7 Mar 2003 15:31:28 GMT",
"version": "v2"
}
] | 2007-05-23 | [
[
"Akers",
"David",
""
]
] | Mac Gregor's constituent-quark model is reviewed with currently published data from light meson spectroscopy. It was previously shown that magnetic sources were responsible for the quantization of several mass-splittings in Mac Gregor's model. The existence of a 70-MeV quantum was postulated by Mac Gregor and was shown to fit the Nambu empirical mass formula mn = (n/2)137me, n a positive integer. It is shown in this paper that the light meson spectra also fit into the constituent-quark model and are in agreement with the Russell-Saunders coupling scheme. The existence of magnetic fields is suggested by the successful accounting of these meson spectra. |
1010.4078 | Emanuele Mereghetti | E. Mereghetti, J. de Vries, W. H. Hockings, C. M. Maekawa, U. van
Kolck | The Electric Dipole Form Factor of the Nucleon in Chiral Perturbation
Theory to Sub-leading Order | 14 pages, 3 figures | Phys.Lett.B696:97-102,2011 | 10.1016/j.physletb.2010.12.018 | null | hep-ph nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The electric dipole form factor (EDFF) of the nucleon stemming from the QCD
theta term and from the quark color-electric dipole moments is calculated in
chiral perturbation theory to sub-leading order. This is the lowest order in
which the isoscalar EDFF receives a calculable, non-analytic contribution from
the pion cloud. In the case of the theta term, the expected lower bound on the
deuteron electric dipole moment is |d_d| > 1.4 10^(-4) \theta e fm. The
momentum dependence of the isovector EDFF is proportional to a non-derivative
time-reversal-violating pion-nucleon coupling, and the scale for momentum
variation ---appearing, in particular, in the radius of the form factor--- is
the pion mass.
| [
{
"created": "Wed, 20 Oct 2010 00:07:02 GMT",
"version": "v1"
}
] | 2011-01-27 | [
[
"Mereghetti",
"E.",
""
],
[
"de Vries",
"J.",
""
],
[
"Hockings",
"W. H.",
""
],
[
"Maekawa",
"C. M.",
""
],
[
"van Kolck",
"U.",
""
]
] | The electric dipole form factor (EDFF) of the nucleon stemming from the QCD theta term and from the quark color-electric dipole moments is calculated in chiral perturbation theory to sub-leading order. This is the lowest order in which the isoscalar EDFF receives a calculable, non-analytic contribution from the pion cloud. In the case of the theta term, the expected lower bound on the deuteron electric dipole moment is |d_d| > 1.4 10^(-4) \theta e fm. The momentum dependence of the isovector EDFF is proportional to a non-derivative time-reversal-violating pion-nucleon coupling, and the scale for momentum variation ---appearing, in particular, in the radius of the form factor--- is the pion mass. |
0901.2599 | Christian Sturm | C. Sturm, Y. Aoki, N.H. Christ, T. Izubuchi, C.T.C. Sachrajda and A.
Soni | Renormalization of quark bilinear operators in a momentum-subtraction
scheme with a nonexceptional subtraction point | 15 pages, 4 figures; final version accepted for publication in the
journal | Phys.Rev.D80:014501,2009 | 10.1103/PhysRevD.80.014501 | CU-TP-1186, KANAZAWA-09-01, RBRC-771, SHEP 09/02 | hep-ph hep-lat | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We extend the Rome-Southampton regularization independent
momentum-subtraction renormalization scheme(RI/MOM) for bilinear operators to
one with a nonexceptional, symmetric subtraction point. Two-point Green's
functions with the insertion of quark bilinear operators are computed with
scalar, pseudoscalar, vector, axial-vector and tensor operators at one-loop
order in perturbative QCD. We call this new scheme RI/SMOM, where the S stands
for "symmetric". Conversion factors are derived, which connect the RI/SMOM
scheme and the MSbar scheme and can be used to convert results obtained in
lattice calculations into the MSbar scheme. Such a symmetric subtraction point
involves nonexceptional momenta implying a lattice calculation with
substantially suppressed contamination from infrared effects. Further, we find
that the size of the one-loop corrections for these infrared improved
kinematics is substantially decreased in the case of the pseudoscalar and
scalar operator, suggesting a much better behaved perturbative series.
Therefore it should allow us to reduce the error in the determination of the
quark mass appreciably.
| [
{
"created": "Mon, 19 Jan 2009 19:02:26 GMT",
"version": "v1"
},
{
"created": "Thu, 22 Apr 2010 22:15:43 GMT",
"version": "v2"
}
] | 2010-05-12 | [
[
"Sturm",
"C.",
""
],
[
"Aoki",
"Y.",
""
],
[
"Christ",
"N. H.",
""
],
[
"Izubuchi",
"T.",
""
],
[
"Sachrajda",
"C. T. C.",
""
],
[
"Soni",
"A.",
""
]
] | We extend the Rome-Southampton regularization independent momentum-subtraction renormalization scheme(RI/MOM) for bilinear operators to one with a nonexceptional, symmetric subtraction point. Two-point Green's functions with the insertion of quark bilinear operators are computed with scalar, pseudoscalar, vector, axial-vector and tensor operators at one-loop order in perturbative QCD. We call this new scheme RI/SMOM, where the S stands for "symmetric". Conversion factors are derived, which connect the RI/SMOM scheme and the MSbar scheme and can be used to convert results obtained in lattice calculations into the MSbar scheme. Such a symmetric subtraction point involves nonexceptional momenta implying a lattice calculation with substantially suppressed contamination from infrared effects. Further, we find that the size of the one-loop corrections for these infrared improved kinematics is substantially decreased in the case of the pseudoscalar and scalar operator, suggesting a much better behaved perturbative series. Therefore it should allow us to reduce the error in the determination of the quark mass appreciably. |
2406.19968 | Leon M. G. De La Vega | Leon M.G. de la Vega, Eduardo Peinado, Jose Wudka | The $L_\mu-L_\tau$ solution to the IceCube UHE neutrino deficit in light
of NA64 | 8 pages, 3 figures | null | null | null | hep-ph | http://creativecommons.org/licenses/by/4.0/ | In this work we analyze the scenario where a MeV scale $L_\mu - L_\tau$ gauge
boson can explain the deficit in the diffuse ultra high energy (UHE)
astrophysical neutrino spectrum observed in IceCube, as well as the discrepancy
between experimental and $e^+e^-$ dispersion data driven SM calculations of the
muon anomalous magnetic moment. We map the parameter space of the model where
the elastic resonant s-channel scattering of UHE neutrinos with the cosmic
neutrino background, mediated by the new Z', can improve the description of the
observed cascade and track spectra over the no-scattering hypothesis. Comparing
to recent NA64$\mu$ results, we find that some part of the parameter space
remains unexplored, but at a data volume of $10^{11}$ muons on target NA64$\mu$
will completely probe this region.
| [
{
"created": "Fri, 28 Jun 2024 14:56:27 GMT",
"version": "v1"
}
] | 2024-07-01 | [
[
"de la Vega",
"Leon M. G.",
""
],
[
"Peinado",
"Eduardo",
""
],
[
"Wudka",
"Jose",
""
]
] | In this work we analyze the scenario where a MeV scale $L_\mu - L_\tau$ gauge boson can explain the deficit in the diffuse ultra high energy (UHE) astrophysical neutrino spectrum observed in IceCube, as well as the discrepancy between experimental and $e^+e^-$ dispersion data driven SM calculations of the muon anomalous magnetic moment. We map the parameter space of the model where the elastic resonant s-channel scattering of UHE neutrinos with the cosmic neutrino background, mediated by the new Z', can improve the description of the observed cascade and track spectra over the no-scattering hypothesis. Comparing to recent NA64$\mu$ results, we find that some part of the parameter space remains unexplored, but at a data volume of $10^{11}$ muons on target NA64$\mu$ will completely probe this region. |
hep-ph/0410181 | Shrihari Gopalakrishna | Shrihari Gopalakrishna and C.-P. Yuan | B-meson signatures of a Supersymmetric U(2) flavor model | 37 pages, 21 figures, RevTeX4; v.2 - minor modifications to improve
readability. Published version | Phys.Rev.D71:035012,2005 | 10.1103/PhysRevD.71.035012 | null | hep-ph | null | We discuss B-meson signatures of a Supersymmetric U(2) flavor model, with
relatively light (electroweak scale masses) third generation right-handed
scalars. We impose current B and K meson experimental constraints on such a
theory, and obtain expectations for B->X_s gamma, B->X_s glue, B->X_s l+ l-,
B->phi K_s, B_s-B_sbar mixing, and the dilepton asymmetry in B_s. We show that
such a theory is compatible with all current data, and furthermore, could
reconcile the apparent deviations from Standard Model predictions that have
been found in some experiments.
| [
{
"created": "Tue, 12 Oct 2004 22:00:40 GMT",
"version": "v1"
},
{
"created": "Fri, 18 Feb 2005 00:47:06 GMT",
"version": "v2"
}
] | 2011-03-23 | [
[
"Gopalakrishna",
"Shrihari",
""
],
[
"Yuan",
"C. -P.",
""
]
] | We discuss B-meson signatures of a Supersymmetric U(2) flavor model, with relatively light (electroweak scale masses) third generation right-handed scalars. We impose current B and K meson experimental constraints on such a theory, and obtain expectations for B->X_s gamma, B->X_s glue, B->X_s l+ l-, B->phi K_s, B_s-B_sbar mixing, and the dilepton asymmetry in B_s. We show that such a theory is compatible with all current data, and furthermore, could reconcile the apparent deviations from Standard Model predictions that have been found in some experiments. |
2201.00600 | Neda Darvishi | Neda Darvishi, M.R. Masouminia and Apostolos Pilaftsis | Higgs-Sector Predictions from Maximally Symmetric multi-Higgs Doublet
Models | DISCRETE 2020-2021 Proceeding, 10 pages and 6 figures | null | null | IPPP/22/02 | hep-ph | http://creativecommons.org/publicdomain/zero/1.0/ | Maximally Symmetric $n$-Higgs Doublet Models (MS-$n$HDMs)define very economic
settings that enable sharp Higgs-sector predictions beyond the Standard Model
(SM) potentially testable at high-energy colliders. The scalar potential of a
MS-$n$HDM obeys an $\mathrm{Sp(2}n)$ symmetry, which is softly broken by
bilinear scalar masses and explicitly by hypercharge and Yukawa couplings
through renormalisation-group effects. The $\mathrm{Sp(2}n)$ also ensures
natural SM alignment and allows for quartic coupling unification up to the
Planck scale. As typical examples, we consider maximally symmetric realisations
of the Type-II 2HDM and the Type-V 3HDM. We show how in terms of a few input
parameters, definite predictions for the entire scalar mass spectrum of the
MS-2HDM and MS-3HDM are obtained, including the SM-like Higgs-boson couplings
to the gauge bosons and fermions.
| [
{
"created": "Mon, 3 Jan 2022 12:03:47 GMT",
"version": "v1"
}
] | 2022-01-04 | [
[
"Darvishi",
"Neda",
""
],
[
"Masouminia",
"M. R.",
""
],
[
"Pilaftsis",
"Apostolos",
""
]
] | Maximally Symmetric $n$-Higgs Doublet Models (MS-$n$HDMs)define very economic settings that enable sharp Higgs-sector predictions beyond the Standard Model (SM) potentially testable at high-energy colliders. The scalar potential of a MS-$n$HDM obeys an $\mathrm{Sp(2}n)$ symmetry, which is softly broken by bilinear scalar masses and explicitly by hypercharge and Yukawa couplings through renormalisation-group effects. The $\mathrm{Sp(2}n)$ also ensures natural SM alignment and allows for quartic coupling unification up to the Planck scale. As typical examples, we consider maximally symmetric realisations of the Type-II 2HDM and the Type-V 3HDM. We show how in terms of a few input parameters, definite predictions for the entire scalar mass spectrum of the MS-2HDM and MS-3HDM are obtained, including the SM-like Higgs-boson couplings to the gauge bosons and fermions. |
1704.04928 | Kazem Azizi | S. S. Agaev, K. Azizi, H. Sundu | Interpretation of the new $\Omega_c^{0}$ states via their mass and width | 12 Pages, 4 Figures and 4 Tables | null | 10.1140/epjc/s10052-017-4953-z | null | hep-ph hep-ex hep-lat | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The mass and pole residue of the ground and first radially excited $
\Omega_c^{0}$ states with spin-parities $J^{P}=1/2^{+},\,3/2^{+}$, as well as
P-wave $\Omega_c^{0}$ with $J^{P}=1/2^{-},\,3/2^{-}$ are calculated by means of
the two-point QCD sum rules. The strong decays of $\Omega_c^{0}$ baryons are
also studied and width of these decay channels are computed. The relevant
computations are performed in the context of the full QCD sum rules on the
light-cone. Obtained results for the masses and widths are confronted with
recent experimental data of LHCb Collaboration, which allow us to interpret
$\Omega_c(3000)^{0}$, $\Omega_c(3050)^{0}$, and $ \Omega_c(3119)^{0} $ as the
excited $css$ baryons with the quantum numbers $ (1P,\,1/2^{-})$,
$(1P,\,3/2^{-})$, and $(2S,\,3/2^{+})$, respectively. The $ (2S,\,1/2^{+})$
state can be assigned either to $\Omega_c(3066)^{0}$ state or
$\Omega_c(3090)^{0}$ excited baryon.
| [
{
"created": "Mon, 17 Apr 2017 11:04:41 GMT",
"version": "v1"
},
{
"created": "Sat, 13 May 2017 19:40:09 GMT",
"version": "v2"
}
] | 2017-06-28 | [
[
"Agaev",
"S. S.",
""
],
[
"Azizi",
"K.",
""
],
[
"Sundu",
"H.",
""
]
] | The mass and pole residue of the ground and first radially excited $ \Omega_c^{0}$ states with spin-parities $J^{P}=1/2^{+},\,3/2^{+}$, as well as P-wave $\Omega_c^{0}$ with $J^{P}=1/2^{-},\,3/2^{-}$ are calculated by means of the two-point QCD sum rules. The strong decays of $\Omega_c^{0}$ baryons are also studied and width of these decay channels are computed. The relevant computations are performed in the context of the full QCD sum rules on the light-cone. Obtained results for the masses and widths are confronted with recent experimental data of LHCb Collaboration, which allow us to interpret $\Omega_c(3000)^{0}$, $\Omega_c(3050)^{0}$, and $ \Omega_c(3119)^{0} $ as the excited $css$ baryons with the quantum numbers $ (1P,\,1/2^{-})$, $(1P,\,3/2^{-})$, and $(2S,\,3/2^{+})$, respectively. The $ (2S,\,1/2^{+})$ state can be assigned either to $\Omega_c(3066)^{0}$ state or $\Omega_c(3090)^{0}$ excited baryon. |
1403.8036 | Evgenij Martynov | A. Alkin, E. Martynov, O. Kovalenko, S.M. Troshin | Impact analysis of TOTEM data at the LHC: black disk limit exceeded | 5 pages, 5 figures | null | 10.1103/PhysRevD.89.091501 | null | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We discuss the profile of the impact--parameter dependent elastic scattering
amplitude. Extraction of impact-parameter dependence from the dataset with
inclusion of the experimental data on elastic scattering at the LHC energies
helps to reveal the asymptotics of hadron interactions. Analysis of the data
clearly indicates that the impact-parameter elastic scattering amplitude exceed
the black disk limit at the LHC energy 7TeV and the inelastic overlap function
reaches its maximum value at $b>0$
| [
{
"created": "Mon, 31 Mar 2014 15:04:56 GMT",
"version": "v1"
}
] | 2015-06-19 | [
[
"Alkin",
"A.",
""
],
[
"Martynov",
"E.",
""
],
[
"Kovalenko",
"O.",
""
],
[
"Troshin",
"S. M.",
""
]
] | We discuss the profile of the impact--parameter dependent elastic scattering amplitude. Extraction of impact-parameter dependence from the dataset with inclusion of the experimental data on elastic scattering at the LHC energies helps to reveal the asymptotics of hadron interactions. Analysis of the data clearly indicates that the impact-parameter elastic scattering amplitude exceed the black disk limit at the LHC energy 7TeV and the inelastic overlap function reaches its maximum value at $b>0$ |
hep-ph/0008071 | Christoph Greub | C. Greub (Bern) and P. Liniger (Bern) | The rare decay b--> s gluon beyond leading logarithms | 14 pages including 5 postscript figures; uses epsfig | Phys.Lett.B494:237-247,2000 | 10.1016/S0370-2693(00)01205-3 | BUTP-00/21 | hep-ph | null | We calculate the alpha_s virtual corrections to the decay width for b --> s
gluon in the standard model. Also the corresponding order alpha_s
bremsstrahlung corrections are systematically calculated in this paper. The
combined result is free of infrared and collinear singularities, in accordance
with the KLN theorem. Taking into account the existing next-to-leading
logarithmic (NLL) result for the Wilson coefficient C_8^(eff), a complete NLL
result for the branching ratio B(b -> s gluon) is derived. Numerically, we
obtain B^(NLL)=(5.0 +/- 1.0) * 10^{-3}, which is more than a factor of two
larger than the leading logarithmic result B^(LL)=(2.2 +/- 0.8) * 10^{-3}.
| [
{
"created": "Tue, 8 Aug 2000 17:27:01 GMT",
"version": "v1"
}
] | 2011-01-05 | [
[
"Greub",
"C.",
"",
"Bern"
],
[
"Liniger",
"P.",
"",
"Bern"
]
] | We calculate the alpha_s virtual corrections to the decay width for b --> s gluon in the standard model. Also the corresponding order alpha_s bremsstrahlung corrections are systematically calculated in this paper. The combined result is free of infrared and collinear singularities, in accordance with the KLN theorem. Taking into account the existing next-to-leading logarithmic (NLL) result for the Wilson coefficient C_8^(eff), a complete NLL result for the branching ratio B(b -> s gluon) is derived. Numerically, we obtain B^(NLL)=(5.0 +/- 1.0) * 10^{-3}, which is more than a factor of two larger than the leading logarithmic result B^(LL)=(2.2 +/- 0.8) * 10^{-3}. |
2204.09528 | Attaphon Kaewsnod | A. Kaewsnod, K. Xu, Z. Zhao, X. Y. Liu, S. Srisuphaphon, A. Limphirat,
Y. Yan | Study of $N(1520)$ and $N(1535)$ structures via $\gamma^*p\to N^*$
transitions | 6 pages, 3 figures | null | 10.1140/epja/s10050-022-00837-0 | null | hep-ph nucl-th | http://creativecommons.org/licenses/by/4.0/ | The helicity amplitudes of the $N(1520)$ and $N(1535)$ resonances in the
$\gamma^*p\to N^*$ electromagnetic transition are studied in the constituent
quark model using the impulse approximation, with the proton and resonances
assumed to be in three-quark configurations. The comparison of theoretical
results and experimental data on the helicity amplitudes $A_{1/2}$, $A_{3/2}$,
and $S_{1/2}$ indicates that the $N(1520)$ and $N(1535)$ resonances are
primarily composed of three-quark $L=1$ states but may contain additional
components. However, it is improbable that contributions from meson clouds will
be dominant at low $Q^2$.
| [
{
"created": "Wed, 20 Apr 2022 15:08:37 GMT",
"version": "v1"
}
] | 2022-09-28 | [
[
"Kaewsnod",
"A.",
""
],
[
"Xu",
"K.",
""
],
[
"Zhao",
"Z.",
""
],
[
"Liu",
"X. Y.",
""
],
[
"Srisuphaphon",
"S.",
""
],
[
"Limphirat",
"A.",
""
],
[
"Yan",
"Y.",
""
]
] | The helicity amplitudes of the $N(1520)$ and $N(1535)$ resonances in the $\gamma^*p\to N^*$ electromagnetic transition are studied in the constituent quark model using the impulse approximation, with the proton and resonances assumed to be in three-quark configurations. The comparison of theoretical results and experimental data on the helicity amplitudes $A_{1/2}$, $A_{3/2}$, and $S_{1/2}$ indicates that the $N(1520)$ and $N(1535)$ resonances are primarily composed of three-quark $L=1$ states but may contain additional components. However, it is improbable that contributions from meson clouds will be dominant at low $Q^2$. |
0907.0474 | Csaba Csaki | Csaba Csaki, Gilad Perez, Ze'ev Surujon and Andreas Weiler | Flavor Alignment via Shining in RS | 28 pages | null | 10.1103/PhysRevD.81.075025 | CERN-PH-TH/2009-109; UCSD/PTH 09-06 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present a class of warped extra dimensional models whose flavor violating
interactions are much suppressed compared to the usual anarchic case due to
flavor alignment. Such suppression can be achieved in models where part of the
global flavor symmetry is gauged in the bulk and broken in a controlled manner.
We show that the bulk masses can be aligned with the down type Yukawa couplings
by an appropriate choice of bulk flavon field representations and TeV brane
dynamics. This alignment could reduce the flavor violating effects to levels
which allow for a Kaluza-Klein scale as low as 2-3 TeV, making the model
observable at the LHC. However, the up-type Yukawa couplings on the IR brane,
which are bounded from below by recent bounds on CP violation in the D system,
induce flavor misalignment radiatively. Off-diagonal down-type Yukawa couplings
and kinetic mixings for the down quarks are both consequences of this effect.
These radiative Yukawa corrections can be reduced by raising the flavon VEV on
the IR brane (at the price of some moderate tuning), or by extending the Higgs
sector. The flavor changing effects from the radiatively induced Yukawa mixing
terms are at around the current upper experimental bounds. We also show the
generic bounds on UV-brane induced flavor violating effects, and comment on
possible additional flavor violations from bulk flavor gauge bosons and the
bulk Yukawa scalars.
| [
{
"created": "Thu, 2 Jul 2009 21:15:52 GMT",
"version": "v1"
}
] | 2013-05-29 | [
[
"Csaki",
"Csaba",
""
],
[
"Perez",
"Gilad",
""
],
[
"Surujon",
"Ze'ev",
""
],
[
"Weiler",
"Andreas",
""
]
] | We present a class of warped extra dimensional models whose flavor violating interactions are much suppressed compared to the usual anarchic case due to flavor alignment. Such suppression can be achieved in models where part of the global flavor symmetry is gauged in the bulk and broken in a controlled manner. We show that the bulk masses can be aligned with the down type Yukawa couplings by an appropriate choice of bulk flavon field representations and TeV brane dynamics. This alignment could reduce the flavor violating effects to levels which allow for a Kaluza-Klein scale as low as 2-3 TeV, making the model observable at the LHC. However, the up-type Yukawa couplings on the IR brane, which are bounded from below by recent bounds on CP violation in the D system, induce flavor misalignment radiatively. Off-diagonal down-type Yukawa couplings and kinetic mixings for the down quarks are both consequences of this effect. These radiative Yukawa corrections can be reduced by raising the flavon VEV on the IR brane (at the price of some moderate tuning), or by extending the Higgs sector. The flavor changing effects from the radiatively induced Yukawa mixing terms are at around the current upper experimental bounds. We also show the generic bounds on UV-brane induced flavor violating effects, and comment on possible additional flavor violations from bulk flavor gauge bosons and the bulk Yukawa scalars. |
1404.6860 | Yan-Qing Ma | Yan-Qing Ma and Jian-Wei Qiu | Extracting Parton Distribution Functions from Lattice QCD Calculations | references updated, version published at PRD | Phys. Rev. D 98, 074021 (2018) | 10.1103/PhysRevD.98.074021 | null | hep-ph hep-lat nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Parton distribution functions (PDFs) are nonperturbative quantities
describing the relation between a hadron and quarks and gluons within it. We
propose to extract PDFs from QCD global analysis of "data" generated by lattice
QCD calculations of good "lattice cross sections", which are basically
single-hadron matrix elements that are lattice QCD calculable and perturbative
QCD factorizable into the PDFs. To demonstrate the existence of good "lattice
cross sections", we take quasi-quark distribution introduced by Ji [1] as a
case study to show that it could be factorized into the PDFs to all orders in
perturbation theory if it can be multiplicatively renormalized. We calculate
the factorized coefficients at the next-to-leading order in $\alpha_s$.
| [
{
"created": "Mon, 28 Apr 2014 03:28:24 GMT",
"version": "v1"
},
{
"created": "Sun, 10 Sep 2017 03:23:03 GMT",
"version": "v2"
},
{
"created": "Tue, 23 Oct 2018 16:49:23 GMT",
"version": "v3"
}
] | 2018-10-24 | [
[
"Ma",
"Yan-Qing",
""
],
[
"Qiu",
"Jian-Wei",
""
]
] | Parton distribution functions (PDFs) are nonperturbative quantities describing the relation between a hadron and quarks and gluons within it. We propose to extract PDFs from QCD global analysis of "data" generated by lattice QCD calculations of good "lattice cross sections", which are basically single-hadron matrix elements that are lattice QCD calculable and perturbative QCD factorizable into the PDFs. To demonstrate the existence of good "lattice cross sections", we take quasi-quark distribution introduced by Ji [1] as a case study to show that it could be factorized into the PDFs to all orders in perturbation theory if it can be multiplicatively renormalized. We calculate the factorized coefficients at the next-to-leading order in $\alpha_s$. |
2201.13245 | George W.-S. Hou | George Wei-Shu Hou | CP Violation for the Heavens and the Earth | 21 pages, 12 figures, invited review | null | null | null | hep-ph hep-ex | http://creativecommons.org/licenses/by/4.0/ | Electroweak baryogenesis can be driven by the top quark in a general two
Higgs doublet model with extra Yukawa couplings. Higgs quartics provide the
first order phase transition, while extra top Yukawa coupling $\rho_{tt}$ can
fuel the cosmic baryon asymmetry through the $\lambda_t\,{\rm Im}\,\rho_{tt}$
product, with flavor-changing $\rho_{tc}$ coupling as backup. The impressive
ACME 2018 bound on the electron electric dipole moment calls for an extra
electron coupling $\rho_{ee}$ for exquisite cancellation among dangerous
diagrams, broadening the baryogenesis solution space. The mechanism suggests
that extra Yukawa couplings echo the hierarchical structure of standard Yukawa
couplings. Phenomenological consequences in Higgs search and flavor physics are
discussed, with $\mu$ and $\tau$ EDM touched upon.
| [
{
"created": "Fri, 28 Jan 2022 15:36:51 GMT",
"version": "v1"
}
] | 2022-02-01 | [
[
"Hou",
"George Wei-Shu",
""
]
] | Electroweak baryogenesis can be driven by the top quark in a general two Higgs doublet model with extra Yukawa couplings. Higgs quartics provide the first order phase transition, while extra top Yukawa coupling $\rho_{tt}$ can fuel the cosmic baryon asymmetry through the $\lambda_t\,{\rm Im}\,\rho_{tt}$ product, with flavor-changing $\rho_{tc}$ coupling as backup. The impressive ACME 2018 bound on the electron electric dipole moment calls for an extra electron coupling $\rho_{ee}$ for exquisite cancellation among dangerous diagrams, broadening the baryogenesis solution space. The mechanism suggests that extra Yukawa couplings echo the hierarchical structure of standard Yukawa couplings. Phenomenological consequences in Higgs search and flavor physics are discussed, with $\mu$ and $\tau$ EDM touched upon. |
hep-ph/9507341 | Sourendu Gupta | Sourendu Gupta(TIFR, Bombay, India), D. Indumathi(Dortmund, Germany),
P. Mathews(CTS, IISC, Bangalore, India), V. Ravindran(TIFR, Bombay, India) | Bloch-Nordsieck Thermometers: One-loop Exponentiation in Finite
Temperature QED | LaTeX file, 29 pages including 3 figures | Nucl.Phys. B458 (1996) 189-214 | 10.1016/0550-3213(95)00558-7 | TIFR/TH/95-05, DO-TH-95-03, IISC-CTS-1/95 | hep-ph | null | We study the scattering of hard external particles in a heat bath in a
real-time formalism for finite temperature QED. We investigate the distribution
of the 4-momentum difference of initial and final hard particles in a fully
covariant manner when the scale of the process, $Q$, is much larger than the
temperature, $T$. Our computations are valid for all $T$ subject to this
constraint. We exponentiate the leading infra-red term at one-loop order
through a resummation of soft (thermal) photon emissions and absorptions. For
$T>0$, we find that tensor structures arise which are not present at $T=0$.
These carry thermal signatures. As a result, external particles can serve as
thermometers introduced into the heat bath. We investigate the phase space
origin of $\log(Q/m)$ and $\log(Q/T)$ terms.
| [
{
"created": "Wed, 19 Jul 1995 19:24:42 GMT",
"version": "v1"
}
] | 2009-10-28 | [
[
"Gupta",
"Sourendu",
"",
"TIFR, Bombay, India"
],
[
"Indumathi",
"D.",
"",
"Dortmund, Germany"
],
[
"Mathews",
"P.",
"",
"CTS, IISC, Bangalore, India"
],
[
"Ravindran",
"V.",
"",
"TIFR, Bombay, India"
]
] | We study the scattering of hard external particles in a heat bath in a real-time formalism for finite temperature QED. We investigate the distribution of the 4-momentum difference of initial and final hard particles in a fully covariant manner when the scale of the process, $Q$, is much larger than the temperature, $T$. Our computations are valid for all $T$ subject to this constraint. We exponentiate the leading infra-red term at one-loop order through a resummation of soft (thermal) photon emissions and absorptions. For $T>0$, we find that tensor structures arise which are not present at $T=0$. These carry thermal signatures. As a result, external particles can serve as thermometers introduced into the heat bath. We investigate the phase space origin of $\log(Q/m)$ and $\log(Q/T)$ terms. |
hep-ph/9310283 | null | Julian Schwinger (University of California, Los Angeles) | The Greening of Quantum Field Theory: George and I | 11 pages | null | null | null | hep-ph | null | This is a lecture given July 14, 1993, at Nottingham.
| [
{
"created": "Thu, 14 Oct 1993 01:05:00 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Schwinger",
"Julian",
"",
"University of California, Los Angeles"
]
] | This is a lecture given July 14, 1993, at Nottingham. |
1502.03045 | Rosti Konoplich | N. Belyaev, R. Konoplich, L. Egholm Pedersen, and K. Prokofiev | Angular asymmetries as a probe for anomalous contributions to HZZ vertex
at the LHC | 9 pages, 8 figures; added 3 references for section 1; added 3
references, added missing unit GeV in Table III and 4 clarifying sentences to
the text | Phys. Rev. D 91, 115014 (2015) | 10.1103/PhysRevD.91.115014 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this article, the prospects for studying the tensor structure of the HZZ
vertex with the LHC experiments are presented. The structure of tensor
couplings in Higgs di-boson decays is investigated by measuring the asymmetries
and by studing the shapes of the final state angular distributions. The
expected background contributions, detector resolution, and trigger and
selection efficiencies are taken into account. The potential of the LHC
experiments to discover sizeable non-Standard Model contributions to the HZZ
vertex with $300\;{\rm fb}^{-1}$ and $3000\;{\rm fb}^{-1}$ is demonstrated.
| [
{
"created": "Tue, 10 Feb 2015 19:21:07 GMT",
"version": "v1"
},
{
"created": "Sat, 14 Feb 2015 18:44:14 GMT",
"version": "v2"
},
{
"created": "Thu, 28 May 2015 15:21:34 GMT",
"version": "v3"
}
] | 2015-06-24 | [
[
"Belyaev",
"N.",
""
],
[
"Konoplich",
"R.",
""
],
[
"Pedersen",
"L. Egholm",
""
],
[
"Prokofiev",
"K.",
""
]
] | In this article, the prospects for studying the tensor structure of the HZZ vertex with the LHC experiments are presented. The structure of tensor couplings in Higgs di-boson decays is investigated by measuring the asymmetries and by studing the shapes of the final state angular distributions. The expected background contributions, detector resolution, and trigger and selection efficiencies are taken into account. The potential of the LHC experiments to discover sizeable non-Standard Model contributions to the HZZ vertex with $300\;{\rm fb}^{-1}$ and $3000\;{\rm fb}^{-1}$ is demonstrated. |
1109.3754 | Alexander E. Dorokhov | A.E. Dorokhov | Pseudoscalar meson form factors and decays | 14 pages, 7 figures, based on the talks given at Hadron Structure 11
(Slovakia, Tatransk\'a \v{S}trba, June 27th - July 1st, 2011), The Actual
Problems of Microworld Physics (Gomel, Belarus, August 1 - 12, 2011),
International Workshop on e+e- collisions from Phi to Psi (Novosibirsk,
Russia, September 19-22, 2011) | null | 10.1016/j.nuclphysbps.2012.02.030 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this communication we discuss few topics related with modern experimental
data on the physics of light pseudoscalar mesons. It includes the contribution
of the pseudoscalar mesons to the muon anomalous magnetic moment (AMM), $g-2$,
the rare decays of light pseudoscalar mesons to lepton pair, the transition
form factors of pseudoscalar mesons at large momentum transfer, the pion
transversity form factor.
Measuring the muon anomalous magnetic moment $g-2$ and the rare decays of
light pseudoscalar mesons into lepton pair $P\rightarrow l^{+}l^{-} $ serve as
important test of the standard model. To reduce the theoretical uncertainty in
the standard model predictions the data on the transition form factors of light
pseudoscalar mesons play significant role. Recently new data on behavior of
these form factors at large momentum transfer was supplied by the BABAR
collaboration. Within the nonlocal chiral quark model it shown how to describe
these data and how the meson distribution amplitude evolves as a function of
the dynamical quark masses and meson masses.
| [
{
"created": "Sat, 17 Sep 2011 07:37:50 GMT",
"version": "v1"
},
{
"created": "Thu, 6 Oct 2011 09:14:37 GMT",
"version": "v2"
}
] | 2015-05-30 | [
[
"Dorokhov",
"A. E.",
""
]
] | In this communication we discuss few topics related with modern experimental data on the physics of light pseudoscalar mesons. It includes the contribution of the pseudoscalar mesons to the muon anomalous magnetic moment (AMM), $g-2$, the rare decays of light pseudoscalar mesons to lepton pair, the transition form factors of pseudoscalar mesons at large momentum transfer, the pion transversity form factor. Measuring the muon anomalous magnetic moment $g-2$ and the rare decays of light pseudoscalar mesons into lepton pair $P\rightarrow l^{+}l^{-} $ serve as important test of the standard model. To reduce the theoretical uncertainty in the standard model predictions the data on the transition form factors of light pseudoscalar mesons play significant role. Recently new data on behavior of these form factors at large momentum transfer was supplied by the BABAR collaboration. Within the nonlocal chiral quark model it shown how to describe these data and how the meson distribution amplitude evolves as a function of the dynamical quark masses and meson masses. |
1804.04560 | Marcus Pernow | Tommy Ohlsson and Marcus Pernow | Running of Fermion Observables in Non-Supersymmetric SO(10) Models | 15 pages, 3 figures, 4 tables. Final version published in JHEP | JHEP 11 (2018) 028 | 10.1007/JHEP11(2018)028 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We investigate the complete renormalization group running of fermion
observables in two different realistic non-supersymmetric models based on the
gauge group $\textrm{SO}(10)$ with intermediate symmetry breaking for both
normal and inverted neutrino mass orderings. Contrary to results of previous
works, we find that the model with the more minimal Yukawa sector of the
Lagrangian fails to reproduce the measured values of observables at the
electroweak scale, whereas the model with the more extended Yukawa sector can
do so if the neutrino masses have normal ordering. The difficulty in finding
acceptable fits to measured data is a result of the added complexity from the
effect of an intermediate symmetry breaking as well as tension in the value of
the leptonic mixing angle $\theta^\ell_{23}$.
| [
{
"created": "Thu, 12 Apr 2018 15:13:55 GMT",
"version": "v1"
},
{
"created": "Fri, 9 Nov 2018 12:32:51 GMT",
"version": "v2"
}
] | 2018-11-12 | [
[
"Ohlsson",
"Tommy",
""
],
[
"Pernow",
"Marcus",
""
]
] | We investigate the complete renormalization group running of fermion observables in two different realistic non-supersymmetric models based on the gauge group $\textrm{SO}(10)$ with intermediate symmetry breaking for both normal and inverted neutrino mass orderings. Contrary to results of previous works, we find that the model with the more minimal Yukawa sector of the Lagrangian fails to reproduce the measured values of observables at the electroweak scale, whereas the model with the more extended Yukawa sector can do so if the neutrino masses have normal ordering. The difficulty in finding acceptable fits to measured data is a result of the added complexity from the effect of an intermediate symmetry breaking as well as tension in the value of the leptonic mixing angle $\theta^\ell_{23}$. |
hep-ph/0206035 | Hsin-Chia Cheng | Hsin-Chia Cheng | Universal Extra Dimensions at the e-e- Colliders | 10 pages, talk presented at the e-e-01 workshop, University of
California, Santa Cruz, Dec.7-9, 2001 | Int.J.Mod.Phys.A18:2779-2786,2003 | 10.1142/S0217751X03016240 | EFI-02-86 | hep-ph | null | Universal Extra Dimensions (UEDs) with compactification radius near the TeV
scale provide interesting phenomenology at future colliders. The collider
signals of the first Kaluza-Klein (KK) level are very similar to those of a
supersymmetric model with a nearly degenerate superpartner spectrum. The
heavier first level KK states cascade decay to the lightest KK particles (LKP),
which is neutral and stable because of KK-parity. The signatures involve
missing energy and relatively soft jets and leptons which can be difficult for
detection. The KK electron signal in $e^- e^-$ collisions is free from the
problematic two photon background therefore provides a unique opportunity for a
detailed studies of the KK electrons in the Universal Extra Dimension scenario.
| [
{
"created": "Tue, 4 Jun 2002 17:13:04 GMT",
"version": "v1"
}
] | 2011-03-23 | [
[
"Cheng",
"Hsin-Chia",
""
]
] | Universal Extra Dimensions (UEDs) with compactification radius near the TeV scale provide interesting phenomenology at future colliders. The collider signals of the first Kaluza-Klein (KK) level are very similar to those of a supersymmetric model with a nearly degenerate superpartner spectrum. The heavier first level KK states cascade decay to the lightest KK particles (LKP), which is neutral and stable because of KK-parity. The signatures involve missing energy and relatively soft jets and leptons which can be difficult for detection. The KK electron signal in $e^- e^-$ collisions is free from the problematic two photon background therefore provides a unique opportunity for a detailed studies of the KK electrons in the Universal Extra Dimension scenario. |
1803.11199 | Miguel Nebot | Joao M. Alves (Lisbon IST and CFTP), Francisco J. Botella (Valencia U.
and IFIC), Gustavo C. Branco (Lisbon IST and CFTP), Fernando Cornet-Gomez
(Valencia U. and IFIC), Miguel Nebot, Joao P. Silva (Lisbon IST and CFTP) | Symmetry Constrained Two Higgs Doublet Models | 30 pages, 5 Tables | Phys. Rev. D 98, 035046 (2018) | 10.1140/epjc/s10052-018-6116-2 | CFTP/18-006 | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study Two-Higgs-Doublet Models (2HDM) where Abelian symmetries have been
introduced, leading to a drastic reduction in the number of free parameters in
the 2HDM. Our analysis is inspired in BGL models, where, as the result of a
symmetry of the Lagrangian, there are tree-level scalar mediated
Flavour-Changing-Neutral-Currents, with the flavour structure depending only on
the CKM matrix. A systematic analysis is done on the various possible schemes,
which are classified in different classes, depending on the way the extra
symmetries constrain the matrices of couplings defining the flavour structure
of the scalar mediated neutral currents. All the resulting flavour textures of
the Yukawa couplings are stable under renormalisation since they result from
symmetries imposed at the Lagrangian level. We also present a brief
phenomenological analysis of the most salient features of each class of
symmetry constrained 2HDM.
| [
{
"created": "Thu, 29 Mar 2018 18:00:12 GMT",
"version": "v1"
}
] | 2018-09-12 | [
[
"Alves",
"Joao M.",
"",
"Lisbon IST and CFTP"
],
[
"Botella",
"Francisco J.",
"",
"Valencia U.\n and IFIC"
],
[
"Branco",
"Gustavo C.",
"",
"Lisbon IST and CFTP"
],
[
"Cornet-Gomez",
"Fernando",
"",
"Valencia U. and IFIC"
],
[
"N... | We study Two-Higgs-Doublet Models (2HDM) where Abelian symmetries have been introduced, leading to a drastic reduction in the number of free parameters in the 2HDM. Our analysis is inspired in BGL models, where, as the result of a symmetry of the Lagrangian, there are tree-level scalar mediated Flavour-Changing-Neutral-Currents, with the flavour structure depending only on the CKM matrix. A systematic analysis is done on the various possible schemes, which are classified in different classes, depending on the way the extra symmetries constrain the matrices of couplings defining the flavour structure of the scalar mediated neutral currents. All the resulting flavour textures of the Yukawa couplings are stable under renormalisation since they result from symmetries imposed at the Lagrangian level. We also present a brief phenomenological analysis of the most salient features of each class of symmetry constrained 2HDM. |
hep-ph/9804360 | Inna Grach | M.Shmatikov (Russian Research Center "Kurchatov Institute") | Quarkonium Mass Splitting Revisited: Effects of Closed Mesonic Channels | 9 pages, plain LaTeX | Phys.Lett. B446 (1999) 43-47 | 10.1016/S0370-2693(98)01504-4 | null | hep-ph | null | Modifications of the mass spectrum the quarkonium induced by its virtual
dissociation into a pair of heavy mesons is considered. Coupling between quark
and mesonic channels results in noticeable corrections to spin-dependent mass
splitting. In particular, the observable hierarchy of mass splittings in the
$\chi_c, \chi_b$ and $\chi'_b$ multiplets is reproduced.
| [
{
"created": "Wed, 22 Apr 1998 12:25:15 GMT",
"version": "v1"
}
] | 2015-06-25 | [
[
"Shmatikov",
"M.",
"",
"Russian Research Center \"Kurchatov Institute\""
]
] | Modifications of the mass spectrum the quarkonium induced by its virtual dissociation into a pair of heavy mesons is considered. Coupling between quark and mesonic channels results in noticeable corrections to spin-dependent mass splitting. In particular, the observable hierarchy of mass splittings in the $\chi_c, \chi_b$ and $\chi'_b$ multiplets is reproduced. |
0911.2547 | Philipp Gubler | P.Gubler, D.Jido, T.Kojo, T.Nishikawa, M.Oka | Possible quantum numbers of the pentaquark \Theta^+(1540) in QCD sum
rules | 22 pages, 9 figures, 4 tables; typos corrected, reference added.
Published in Phys. Rev. D | Phys.Rev.D80:114030,2009 | 10.1103/PhysRevD.80.114030 | YITP-09-68, RBRC-822 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The QCD sum rule technique is employed to investigate pentaquark states with
strangeness S = +1 and IJ^P = 0,1/2^\pm, 1,1/2^\pm, 0,3/2^\pm, 1,3/2^\pm.
Throughout the calculation, emphasis is laid on the establishment of a valid
Borel window, which corresponds to a region of the Borel mass, where the
operator product expansion converges and the presumed ground state pole
dominates the sum rules. Such a Borel window is achieved by constructing the
sum rules from the difference of two independent correlators and by calculating
the operator product expansion up to dimension 14. Furthermore, we discuss the
possibility of the contamination of the sum rules by possible KN scattering
states. As a result, we conclude that the 0,3/2^+ state seems to be the most
probable candidate for the experimentally observed \Theta^+(1540), while we
also obtain states with 0,1/2^-, 1,1/2^-, 1,3/2^+ at somewhat higher mass
regions.
| [
{
"created": "Fri, 13 Nov 2009 06:56:32 GMT",
"version": "v1"
},
{
"created": "Fri, 15 Jan 2010 08:10:27 GMT",
"version": "v2"
}
] | 2010-01-15 | [
[
"Gubler",
"P.",
""
],
[
"Jido",
"D.",
""
],
[
"Kojo",
"T.",
""
],
[
"Nishikawa",
"T.",
""
],
[
"Oka",
"M.",
""
]
] | The QCD sum rule technique is employed to investigate pentaquark states with strangeness S = +1 and IJ^P = 0,1/2^\pm, 1,1/2^\pm, 0,3/2^\pm, 1,3/2^\pm. Throughout the calculation, emphasis is laid on the establishment of a valid Borel window, which corresponds to a region of the Borel mass, where the operator product expansion converges and the presumed ground state pole dominates the sum rules. Such a Borel window is achieved by constructing the sum rules from the difference of two independent correlators and by calculating the operator product expansion up to dimension 14. Furthermore, we discuss the possibility of the contamination of the sum rules by possible KN scattering states. As a result, we conclude that the 0,3/2^+ state seems to be the most probable candidate for the experimentally observed \Theta^+(1540), while we also obtain states with 0,1/2^-, 1,1/2^-, 1,3/2^+ at somewhat higher mass regions. |
0909.1204 | Javier Vijande Asenjo | P. Gonzalez | Long-distance behavior of the quark-antiquark static potential.
Application to light-quark mesons and heavy quarkonia | Accepted in PRD | Phys.Rev.D80:054010,2009 | 10.1103/PhysRevD.80.054010 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Screening effects from sea pairs on the quark-antiquark static potential are
analyzed phenomenologically from the light-quark to the heavy-quark meson
spectra. From the high excited light-quark meson spectrum a universal form for
the screened static potential is proposed. This potential is then succesfully
applied to heavy quarkonia. Our results suggest the assignment of X(4260) to
the 4s state of charmonium and the possible existence of a 5s bottomonium
resonance around 10748 MeV.
| [
{
"created": "Mon, 7 Sep 2009 10:25:06 GMT",
"version": "v1"
}
] | 2009-09-24 | [
[
"Gonzalez",
"P.",
""
]
] | Screening effects from sea pairs on the quark-antiquark static potential are analyzed phenomenologically from the light-quark to the heavy-quark meson spectra. From the high excited light-quark meson spectrum a universal form for the screened static potential is proposed. This potential is then succesfully applied to heavy quarkonia. Our results suggest the assignment of X(4260) to the 4s state of charmonium and the possible existence of a 5s bottomonium resonance around 10748 MeV. |
hep-ph/0008213 | Gogoladze Ilia | Ilia Gogoladze and Mirian Tsulaia | Anomalous U(1)_A and Electroweak Symmetry Breaking | Latex, 11 pages, discussions and references added | Mod.Phys.Lett. A16 (2001) 835-844 | 10.1142/S0217732301004005 | JINR E2-2000-207, IC/2000/149 | hep-ph hep-th | null | We suggest a new mechanism for electroweak symmetry breaking in the
supersymmetric Standard Model. Our suggestion is based on the presence of an
anomalous U(1)_A gauge symmetry, which naturally arises in the four dimensional
superstring theory, and heavily relies on the value of the corresponding
Fayet-Illiopoulos \xi-term.
| [
{
"created": "Sat, 19 Aug 2000 22:20:59 GMT",
"version": "v1"
},
{
"created": "Sat, 9 Sep 2000 16:13:41 GMT",
"version": "v2"
},
{
"created": "Wed, 14 Feb 2001 22:57:34 GMT",
"version": "v3"
}
] | 2009-10-31 | [
[
"Gogoladze",
"Ilia",
""
],
[
"Tsulaia",
"Mirian",
""
]
] | We suggest a new mechanism for electroweak symmetry breaking in the supersymmetric Standard Model. Our suggestion is based on the presence of an anomalous U(1)_A gauge symmetry, which naturally arises in the four dimensional superstring theory, and heavily relies on the value of the corresponding Fayet-Illiopoulos \xi-term. |
1301.3812 | Dragan Lukman | Astri Kleppe | Flavour Symmetric Mass Matrices | 8 pages, To appear in the Proceedings to the 15th Bled Workshop "What
Comes Beyond Standard Models", DMFA ZALOZNISTVO, December 2012, Vol. 13, No.
2 | null | null | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The structure of flavour space is determined by the form of the quark mass
matrices in the weak flavour space basis. We examine some matrix textures in
the light of flavour permutations symmetry arguments, for three and four
families.
| [
{
"created": "Wed, 16 Jan 2013 20:11:40 GMT",
"version": "v1"
}
] | 2013-01-17 | [
[
"Kleppe",
"Astri",
""
]
] | The structure of flavour space is determined by the form of the quark mass matrices in the weak flavour space basis. We examine some matrix textures in the light of flavour permutations symmetry arguments, for three and four families. |
0711.2986 | Robert Thorne S | R.S. Thorne | The role of uncertainties in parton distribution functions | 10 pages, 15 figures as .ps or .eps files, invited talk at
PHYSTAT-LHC Workshop on Statistical Issues for LHC Physics, June 2007 | null | null | null | hep-ph | null | I consider the uncertainties in parton distributions and the consequences for
hadronic cross-sections. There is ever-increasing sophistication in the
relationship between the uncertainties of the distributions and the errors on
the experimental data used to extract them. However, I demonstrate that this
uncertainty is frequently subsumed by that due to the choice of data used in
fits, and more surprisingly by the precise details of the theoretical framework
used. Variations in heavy flavour prescriptions provide striking examples.
| [
{
"created": "Mon, 19 Nov 2007 18:07:19 GMT",
"version": "v1"
}
] | 2007-11-20 | [
[
"Thorne",
"R. S.",
""
]
] | I consider the uncertainties in parton distributions and the consequences for hadronic cross-sections. There is ever-increasing sophistication in the relationship between the uncertainties of the distributions and the errors on the experimental data used to extract them. However, I demonstrate that this uncertainty is frequently subsumed by that due to the choice of data used in fits, and more surprisingly by the precise details of the theoretical framework used. Variations in heavy flavour prescriptions provide striking examples. |
hep-ph/9306237 | Masaharu Tanabashi | Masaharu Tanabashi | Chiral Perturbation to One Loop Including the $\rho$ Meson | 14pages, KEK-TH-349/KEK preprint 92-169 | Phys.Lett. B316 (1993) 534-541 | 10.1016/0370-2693(93)91040-T | null | hep-ph | null | We formulate the chiral perturbation theory at the one loop level in the
effective lagrangian including the $\rho$ meson as a dynamical gauge boson of a
hidden local symmetry(HLS). The size of radiative correction to the
phenomenological parameter $a$ of HLS is estimated to be about $10$\%. The
complete list of ${\cal O}(E^4)$ terms is given and the one loop counter terms
are determined explicitly in the $N$ flavor model. We also obtain matching
conditions to the conventional chiral perturbation of Gasser and Leutwyler in
the chiral limit in a renormalization scale independent manner. We find that
Gasser--Leutwyler's estimates for $L_{9,10}$ are saturated by $\rho$ and its
one loop contributions without introducing non-minimal couplings of
$\pi$-$\rho$ system, suggesting the absence of the tree level $a_1$ meson
contributions.
| [
{
"created": "Mon, 7 Jun 1993 13:18:39 GMT",
"version": "v1"
}
] | 2009-10-22 | [
[
"Tanabashi",
"Masaharu",
""
]
] | We formulate the chiral perturbation theory at the one loop level in the effective lagrangian including the $\rho$ meson as a dynamical gauge boson of a hidden local symmetry(HLS). The size of radiative correction to the phenomenological parameter $a$ of HLS is estimated to be about $10$\%. The complete list of ${\cal O}(E^4)$ terms is given and the one loop counter terms are determined explicitly in the $N$ flavor model. We also obtain matching conditions to the conventional chiral perturbation of Gasser and Leutwyler in the chiral limit in a renormalization scale independent manner. We find that Gasser--Leutwyler's estimates for $L_{9,10}$ are saturated by $\rho$ and its one loop contributions without introducing non-minimal couplings of $\pi$-$\rho$ system, suggesting the absence of the tree level $a_1$ meson contributions. |
1209.3363 | Natsumi Nagata | Natsumi Nagata | A calculation for vector dark matter direct detection | Contribution to the Proceedings of PASCOS2012 conference; 6 pages and
6 figures | null | null | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We evaluate the elastic scattering cross section of vector dark matter with
nucleon based on the method of effective field theory. The dark matter is
assumed to behave as a vector particle under the Lorentz transformation and to
interact with colored particles including quarks in the Standard Model. After
formulating general formulae for the scattering cross sections, we apply them
to the case of the first Kaluza-Klein photon dark matter in the minimal
universal extra dimension model. The resultant cross sections are found to be
larger than those calculated in previous literature.
| [
{
"created": "Sat, 15 Sep 2012 07:21:03 GMT",
"version": "v1"
}
] | 2012-09-18 | [
[
"Nagata",
"Natsumi",
""
]
] | We evaluate the elastic scattering cross section of vector dark matter with nucleon based on the method of effective field theory. The dark matter is assumed to behave as a vector particle under the Lorentz transformation and to interact with colored particles including quarks in the Standard Model. After formulating general formulae for the scattering cross sections, we apply them to the case of the first Kaluza-Klein photon dark matter in the minimal universal extra dimension model. The resultant cross sections are found to be larger than those calculated in previous literature. |
1303.3833 | Haiying Cai | Haiying Cai | Higgs decay into diphoton in the Composite Higgs Model | 19 pages, and 4 figures, new form factor for H-Z-photon coupling from
non diagonal gauge interaction is added in the appendix, final version | Phys. Rev. D 88, 035018 (2013) | 10.1103/PhysRevD.88.035018 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We explore the Higgs couplings to gauge bosons in the minimal $SO(5)/SO(4)$
4D composite Higgs model. The pions scatterings put unitary constraints on the
couplings and therefore determine the branch ratios of various Higgs decays.
Through fine tuning the parameters, enhancement of Higgs to diphoton rate is
possible to be achieved with the existence of vector meson fields.
| [
{
"created": "Fri, 15 Mar 2013 17:18:39 GMT",
"version": "v1"
},
{
"created": "Wed, 1 May 2013 17:01:01 GMT",
"version": "v2"
},
{
"created": "Thu, 8 Aug 2013 18:29:27 GMT",
"version": "v3"
}
] | 2013-08-23 | [
[
"Cai",
"Haiying",
""
]
] | We explore the Higgs couplings to gauge bosons in the minimal $SO(5)/SO(4)$ 4D composite Higgs model. The pions scatterings put unitary constraints on the couplings and therefore determine the branch ratios of various Higgs decays. Through fine tuning the parameters, enhancement of Higgs to diphoton rate is possible to be achieved with the existence of vector meson fields. |
0804.0622 | Johannes Heinonen | Csaba Csaki, Johannes Heinonen, Maxim Perelstein and Christian
Spethmann | A Weakly Coupled Ultraviolet Completion of the Littlest Higgs with
T-parity | v1: 30 pages, 4 figures v2: minor clarifications added and typos
corrected | Phys.Rev.D79:035014,2009 | 10.1103/PhysRevD.79.035014 | null | hep-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We construct a weakly coupled, renormalizable ultraviolet completion of the
Littlest Higgs model with T-parity (LHT), based on an SU(5)xSU(2)xU(1) gauge
theory with a discrete Z_2 symmetry. Our model reproduces the complete
structure of the LHT below the 10 TeV scale, including the collective symmetry
breaking mechanism which solves the little hierarchy problem. The model is
manifestly free of anomalies, including both gauge/gravitational anomalies and
anomalies involving T-parity. At the TeV scale, the model contains additional
states not present in the LHT. We estimate the impact of these states on
precision electroweak observables, and show that the model is realistic. We
also discuss how our model can be embedded into a supersymmetric theory or a
five-dimensional setup with a warped extra dimension, stabilyzing the hierarchy
between the 10 TeV and the Planck scale.
| [
{
"created": "Fri, 4 Apr 2008 19:18:47 GMT",
"version": "v1"
},
{
"created": "Thu, 3 Jul 2008 15:44:31 GMT",
"version": "v2"
}
] | 2009-11-13 | [
[
"Csaki",
"Csaba",
""
],
[
"Heinonen",
"Johannes",
""
],
[
"Perelstein",
"Maxim",
""
],
[
"Spethmann",
"Christian",
""
]
] | We construct a weakly coupled, renormalizable ultraviolet completion of the Littlest Higgs model with T-parity (LHT), based on an SU(5)xSU(2)xU(1) gauge theory with a discrete Z_2 symmetry. Our model reproduces the complete structure of the LHT below the 10 TeV scale, including the collective symmetry breaking mechanism which solves the little hierarchy problem. The model is manifestly free of anomalies, including both gauge/gravitational anomalies and anomalies involving T-parity. At the TeV scale, the model contains additional states not present in the LHT. We estimate the impact of these states on precision electroweak observables, and show that the model is realistic. We also discuss how our model can be embedded into a supersymmetric theory or a five-dimensional setup with a warped extra dimension, stabilyzing the hierarchy between the 10 TeV and the Planck scale. |
1303.5646 | Cai-Dian Lu | Cheng Li, Cai-Dian Lu and Xiang-Dong Gao | Study the Forward-Backward Asymmetry of the Top Quark Production in the
Randall-Sundrum Model with an Extension of Strong Interaction | 14 pages, 6 figures, accepted for publication in PRD | null | 10.1103/PhysRevD.88.056019 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The large forward-backward asymmetry of the top quark pair production
measured by the hadron colliders shed light on new physics signals beyond the
Standard Model. In the Randall-Sundrum model with an additional SU(3) group in
the strong sector, we compare the total cross section and forward-backward
asymmetry of the top quark pair production with the newest data obtained by the
CDF and the D0 collaborations. Our numerical analysis shows that the parameter
$c_q \gtrsim 0.5$, $c_t \sim -0.6\sim-0.8$, $\tan\phi \gtrsim 20$ or $\tan\phi
\leq 1/20$ and the first excitation of axial gluon with a mass about $5
\thicksim 6 \mathrm{TeV}$ can accommodate this large anomaly without violating
other experimental constraints.
| [
{
"created": "Fri, 22 Mar 2013 15:33:34 GMT",
"version": "v1"
},
{
"created": "Tue, 10 Sep 2013 09:48:22 GMT",
"version": "v2"
}
] | 2013-10-02 | [
[
"Li",
"Cheng",
""
],
[
"Lu",
"Cai-Dian",
""
],
[
"Gao",
"Xiang-Dong",
""
]
] | The large forward-backward asymmetry of the top quark pair production measured by the hadron colliders shed light on new physics signals beyond the Standard Model. In the Randall-Sundrum model with an additional SU(3) group in the strong sector, we compare the total cross section and forward-backward asymmetry of the top quark pair production with the newest data obtained by the CDF and the D0 collaborations. Our numerical analysis shows that the parameter $c_q \gtrsim 0.5$, $c_t \sim -0.6\sim-0.8$, $\tan\phi \gtrsim 20$ or $\tan\phi \leq 1/20$ and the first excitation of axial gluon with a mass about $5 \thicksim 6 \mathrm{TeV}$ can accommodate this large anomaly without violating other experimental constraints. |
hep-ph/9804268 | Jake Lee | S.Y. Choi, Jake Lee and J. Song | CP Violation in the Cabbibo-suppressed Decay Tau->K Pi Nu_tau with
Polarized Tau Leptons | LaTeX 13 pages, 1 figure eps included | Phys.Lett. B437 (1998) 191-200 | 10.1016/S0370-2693(98)00872-7 | YUMS 98-06, SNUTP 98-30 | hep-ph | null | CP violation from physics beyond the Standard Model (SM) is investigated in
the Cabbibo-suppressed decay $\tau\to K\pi\nu_{\tau}$ with polarized $\tau$
leptons, to which both the ${\rm J}^{P}=1^-$ resonance $K^*$ and the $
J^{P}=0^+$ resonance $K^*_0$ contribute. In addition to the CP-odd rate
asymmetry, $\tau$ polarization enables us to construct three additional CP-odd
polarization asymmetries that can be enhanced due to the interference between
the $K^*$ and $K^*_0$, and whose magnitudes depend crucially on the $K^*_0$
decay constant, $f_{K^*_0}$. Taking a QCD sum rule estimate of $f_{K^*_0}=45$
MeV and the present experimental constraints on the CP-odd parameters into
account, we estimate quantitatively the maximally-allowed values for the CP-odd
rate and polarization asymmetries in the multi-Higgs-doublet (MHD) model and
the scalar-leptoquark (SLQ) models consistent with the SM gauge symmetry where
neutrinos are massless and left-handed as in the SM. We find that the CP-odd
rate and polarization asymmetries are of a similar size for highly-polarized
$\tau$ leptons and, for their maximally-allowed values, CP violation in the MHD
model and two SLQ models may be detected with about $10^6$ and $10^7$ $\tau$'s
at the $1\sigma$ level.
| [
{
"created": "Fri, 10 Apr 1998 06:01:49 GMT",
"version": "v1"
}
] | 2009-10-31 | [
[
"Choi",
"S. Y.",
""
],
[
"Lee",
"Jake",
""
],
[
"Song",
"J.",
""
]
] | CP violation from physics beyond the Standard Model (SM) is investigated in the Cabbibo-suppressed decay $\tau\to K\pi\nu_{\tau}$ with polarized $\tau$ leptons, to which both the ${\rm J}^{P}=1^-$ resonance $K^*$ and the $ J^{P}=0^+$ resonance $K^*_0$ contribute. In addition to the CP-odd rate asymmetry, $\tau$ polarization enables us to construct three additional CP-odd polarization asymmetries that can be enhanced due to the interference between the $K^*$ and $K^*_0$, and whose magnitudes depend crucially on the $K^*_0$ decay constant, $f_{K^*_0}$. Taking a QCD sum rule estimate of $f_{K^*_0}=45$ MeV and the present experimental constraints on the CP-odd parameters into account, we estimate quantitatively the maximally-allowed values for the CP-odd rate and polarization asymmetries in the multi-Higgs-doublet (MHD) model and the scalar-leptoquark (SLQ) models consistent with the SM gauge symmetry where neutrinos are massless and left-handed as in the SM. We find that the CP-odd rate and polarization asymmetries are of a similar size for highly-polarized $\tau$ leptons and, for their maximally-allowed values, CP violation in the MHD model and two SLQ models may be detected with about $10^6$ and $10^7$ $\tau$'s at the $1\sigma$ level. |
1403.6556 | Khiem Hong Phan | P.H. Khiem, Y. Kurihara, J. Fujimoto, M. Igarashi, T. Ishikawa, T.
Kaneko, K. Kato, N. Nakazawa, Y. Shimizu, K. Tobimatsu, T. Ueda, J.A.M.
Vermaseren, Y. Yasui | Full $\mathcal{O}(\alpha)$ electroweak radiative corrections to $t
\bar{t} \gamma$ and $e^-e^+\gamma$ productions at ILC with GRACE-Loop | 4 pages, Proceedings of ICISE2013 - Rencontres du Vietnam, Windows on
the Universe. 11-17 Aug 2013. Quy Nhon, Vietnam | null | null | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The full $\mathcal{O}(\alpha)$ electroweak radiative corrections to $t
\bar{t} \gamma$ and $e^-e^+\gamma$ productions at the International Linear
Collider (ILC) are presented in this paper. The computation is performed with
the help of GRACE-Loop system. In the physical results, we discuss on the cross
section, electroweak corrections, and the top quark forward-backward asymmetry
($A_{FB}$) which are the function of the center-of-mass energy.
| [
{
"created": "Wed, 26 Mar 2014 01:58:05 GMT",
"version": "v1"
}
] | 2014-03-27 | [
[
"Khiem",
"P. H.",
""
],
[
"Kurihara",
"Y.",
""
],
[
"Fujimoto",
"J.",
""
],
[
"Igarashi",
"M.",
""
],
[
"Ishikawa",
"T.",
""
],
[
"Kaneko",
"T.",
""
],
[
"Kato",
"K.",
""
],
[
"Nakazawa",
"N.",
... | The full $\mathcal{O}(\alpha)$ electroweak radiative corrections to $t \bar{t} \gamma$ and $e^-e^+\gamma$ productions at the International Linear Collider (ILC) are presented in this paper. The computation is performed with the help of GRACE-Loop system. In the physical results, we discuss on the cross section, electroweak corrections, and the top quark forward-backward asymmetry ($A_{FB}$) which are the function of the center-of-mass energy. |
hep-ph/0402125 | Taizan Watari | Taizan Watari and T. Yanagida | GUT Phase Transition and Hybrid Inflation | 11 pages; references added | Phys.Lett.B589:71-77,2004 | 10.1016/j.physletb.2004.03.026 | LBNL-54530, UT04-05 | hep-ph hep-th | null | The supersymmetric model of hybrid inflation is interesting not only because
of its naturalness but also because of another reason. Its energy scale
determined by the COBE normalization is 10^15 - 10^16 GeV. It happens to be the
energy scale of interest in particle physics, namely, the mass scale of
right-handed neutrinos or the energy scale of the gauge-coupling unification.
It is true that topological defects are produced after the hybrid inflation if
it is related to a U(1)_B-L or a GUT-symmetry breaking, and hence one cannot
naively identify models of particle physics with that of inflation. But those
defects are not necessarily found in modified models. We show in this article
that quite a simple extension of the minimal supersymmetric hybrid inflation
model is free from monopoles or cosmic strings. Moreover, it happens to be
exactly the same as a well-motivated extension of SU(5)-unified theories. The
vacuum energy is dominated by F-term. The \eta-problem is not necessarily
serious when the model is realized by D-branes. Although it has been considered
that a coupling constant has to be very small when the vacuum energy is
dominated by F-term, this constraint is not applied either to the D-brane
model. They are due to a particular form of the Kahler potential and
interaction of the model. Reheating process is also discussed.
| [
{
"created": "Wed, 11 Feb 2004 19:44:01 GMT",
"version": "v1"
},
{
"created": "Thu, 11 Mar 2004 18:30:14 GMT",
"version": "v2"
}
] | 2014-11-17 | [
[
"Watari",
"Taizan",
""
],
[
"Yanagida",
"T.",
""
]
] | The supersymmetric model of hybrid inflation is interesting not only because of its naturalness but also because of another reason. Its energy scale determined by the COBE normalization is 10^15 - 10^16 GeV. It happens to be the energy scale of interest in particle physics, namely, the mass scale of right-handed neutrinos or the energy scale of the gauge-coupling unification. It is true that topological defects are produced after the hybrid inflation if it is related to a U(1)_B-L or a GUT-symmetry breaking, and hence one cannot naively identify models of particle physics with that of inflation. But those defects are not necessarily found in modified models. We show in this article that quite a simple extension of the minimal supersymmetric hybrid inflation model is free from monopoles or cosmic strings. Moreover, it happens to be exactly the same as a well-motivated extension of SU(5)-unified theories. The vacuum energy is dominated by F-term. The \eta-problem is not necessarily serious when the model is realized by D-branes. Although it has been considered that a coupling constant has to be very small when the vacuum energy is dominated by F-term, this constraint is not applied either to the D-brane model. They are due to a particular form of the Kahler potential and interaction of the model. Reheating process is also discussed. |
1106.4651 | Gaber Faisel Dr | Gaber Faisel | Supersymmetric contributions to $\bar{B}_s \to \phi \pi^0$ and
$\bar{B}_s \to \phi \rho^0$ decays in SCET | 25 pages,5 figures, version accepted for publication | null | 10.1007/JHEP08(2012)031 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the decay modes $\bar{B}_s\to \phi \pi^0$ and $\bar{B}_s\to \phi
\rho^0$ using Soft Collinear Effective Theory. Within Standard Model and
including the error due to the SU(3) breaking effect in the SCET parameters we
find that BR $\bar{B}_s\to \phi \pi^0 =7_{-1-2}^{+1+2}\times 10^{-8} $ and BR
$\bar{B}_s\to \phi \pi^0=9_{-1-4}^{+1+3}\times 10^{-8}$ corresponding to
solution 1 and solution 2 of the SCET parameters respectively.For the decay
mode $\bar{B}_s\to \phi \rho^0$, we find that BR $\bar{B}_s\to \phi \rho^0 =
20.2^{+1+9}_{-1-12}\times 10^{-8} $ and BR $ \bar{B}_s\to \phi \rho^0 =
34.0^{+1.5 + 15}_{-1.5-22}\times 10^{-8} $ corresponding to solution 1 and
solution 2 of the SCET parameters respectively. We extend our study to include
supersymmetric models with non-universal A-terms where the dominant
contributions arise from diagrams mediated by gluino and chargino exchanges. We
show that gluino contributions can not lead to an enhancement of the branching
ratios of $\bar{B}_s\to \phi \pi^0$ and $\bar{B}_s\to \phi \rho^0$. In
addition, we show that SUSY contributions mediated by chargino exchange can
enhance the branching ratio of $\bar{B}_s\to \phi \pi^0$ by about 14% with
respect to the SM prediction. For the branching ratio of $\bar{B}_s\to \phi
\rho^0$, we find that SUSY contributions can enhance its value by about 1% with
respect to the SM prediction.
| [
{
"created": "Thu, 23 Jun 2011 08:24:17 GMT",
"version": "v1"
},
{
"created": "Thu, 26 Jul 2012 16:33:12 GMT",
"version": "v2"
}
] | 2015-05-28 | [
[
"Faisel",
"Gaber",
""
]
] | We study the decay modes $\bar{B}_s\to \phi \pi^0$ and $\bar{B}_s\to \phi \rho^0$ using Soft Collinear Effective Theory. Within Standard Model and including the error due to the SU(3) breaking effect in the SCET parameters we find that BR $\bar{B}_s\to \phi \pi^0 =7_{-1-2}^{+1+2}\times 10^{-8} $ and BR $\bar{B}_s\to \phi \pi^0=9_{-1-4}^{+1+3}\times 10^{-8}$ corresponding to solution 1 and solution 2 of the SCET parameters respectively.For the decay mode $\bar{B}_s\to \phi \rho^0$, we find that BR $\bar{B}_s\to \phi \rho^0 = 20.2^{+1+9}_{-1-12}\times 10^{-8} $ and BR $ \bar{B}_s\to \phi \rho^0 = 34.0^{+1.5 + 15}_{-1.5-22}\times 10^{-8} $ corresponding to solution 1 and solution 2 of the SCET parameters respectively. We extend our study to include supersymmetric models with non-universal A-terms where the dominant contributions arise from diagrams mediated by gluino and chargino exchanges. We show that gluino contributions can not lead to an enhancement of the branching ratios of $\bar{B}_s\to \phi \pi^0$ and $\bar{B}_s\to \phi \rho^0$. In addition, we show that SUSY contributions mediated by chargino exchange can enhance the branching ratio of $\bar{B}_s\to \phi \pi^0$ by about 14% with respect to the SM prediction. For the branching ratio of $\bar{B}_s\to \phi \rho^0$, we find that SUSY contributions can enhance its value by about 1% with respect to the SM prediction. |
hep-ph/9205214 | null | C. Giunti, C.W. Kim and U.W. Lee | Oscillations of Pseudo-Dirac Neutrinos and the Solar Neutrino Problem | 12 pages, 2 figures (not included) | Phys.Rev. D46 (1992) 3034-3039 | 10.1103/PhysRevD.46.3034 | null | hep-ph | null | The oscillations of pseudo-Dirac neutrinos in matter are discussed and
applied to the solar neutrino problem. Several scenarios such as both $\nu_e$
and $\nu_{\mu}$ being pseudo-Dirac and only $\nu_e$ or $\nu_{\mu}$ being
pseudo-Dirac are examined. It is shown that the allowed region in the
mass-mixing angle parameter space obtained by comparing the solar neutrino data
with the calculations based on the standard solar model and the MSW effect is
not unique. The results depend on the nature of neutrinos; for example, if both
$\nu_e$ and $\nu_{\mu}$ are pseudo-Dirac, the allowed region determined by the
current solar neutrino data does not overlap with that obtained in the usual
case of pure Dirac or Majorana neutrinos.
| [
{
"created": "Sat, 9 May 1992 11:36:00 GMT",
"version": "v1"
}
] | 2009-10-22 | [
[
"Giunti",
"C.",
""
],
[
"Kim",
"C. W.",
""
],
[
"Lee",
"U. W.",
""
]
] | The oscillations of pseudo-Dirac neutrinos in matter are discussed and applied to the solar neutrino problem. Several scenarios such as both $\nu_e$ and $\nu_{\mu}$ being pseudo-Dirac and only $\nu_e$ or $\nu_{\mu}$ being pseudo-Dirac are examined. It is shown that the allowed region in the mass-mixing angle parameter space obtained by comparing the solar neutrino data with the calculations based on the standard solar model and the MSW effect is not unique. The results depend on the nature of neutrinos; for example, if both $\nu_e$ and $\nu_{\mu}$ are pseudo-Dirac, the allowed region determined by the current solar neutrino data does not overlap with that obtained in the usual case of pure Dirac or Majorana neutrinos. |
2008.13685 | Somnath Kar | Somnath Kar, Subikash Choudhury, Xiaoming Zhang, and Daicui Zhou | Examining the event-shape dependent modifications to charged-particle
transverse momentum spectra and elliptic flow in p-Pb collisions at energies
available at the CERN Large Hadron Collider | 8 pages, 7 figures, Accepted in Physical Review C | Phys. Rev. C 102, 044901 (2020) | 10.1103/PhysRevC.102.044901 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Purported signatures of collective dynamics in small systems like
proton-proton (pp) or proton-nucleus (p-A) collisions still lack unambiguous
understanding. Despite the qualitative and/or quantitative agreement of the
data to hydrodynamic models, it has remained unclear whether the harmonic flows
in small systems relate to the common physical picture of hydrodynamic
collectivity driven by the initial geometry. In the present work, we aim to
address this issue by invoking a novel concept of Event Shape Engineering
(ESE), which has been leveraged to get some control of the initial geometry in
high-energy heavy-ion collisions. We utilise ESE by constructing a reference
flow vector, $q_{2}$ that allows to characterise an event based on it's
ellipticity. Applying this technique on a data set, simulated from a 3+1D
viscous hydrodynamic model EPOS3, we study the event-shape dependent
modifications to some of the bulk properties like, inclusive transverse
momentum ($p_{T}$) spectra and $p_{T}$-differential $v_{2}$ for p-Pb collisions
at 5.02 TeV. Selecting events on the basis of different magnitudes of reference
flow vector $q_{2}$, we observe a hint of event-shape induced modifications of
$v_{2}$ as a function of $p_{T}$ but, the inclusive $p_{T}$-spectra of charged
particles seem to be insensitive to this event-shape selection.
| [
{
"created": "Mon, 31 Aug 2020 15:46:15 GMT",
"version": "v1"
}
] | 2020-10-07 | [
[
"Kar",
"Somnath",
""
],
[
"Choudhury",
"Subikash",
""
],
[
"Zhang",
"Xiaoming",
""
],
[
"Zhou",
"Daicui",
""
]
] | Purported signatures of collective dynamics in small systems like proton-proton (pp) or proton-nucleus (p-A) collisions still lack unambiguous understanding. Despite the qualitative and/or quantitative agreement of the data to hydrodynamic models, it has remained unclear whether the harmonic flows in small systems relate to the common physical picture of hydrodynamic collectivity driven by the initial geometry. In the present work, we aim to address this issue by invoking a novel concept of Event Shape Engineering (ESE), which has been leveraged to get some control of the initial geometry in high-energy heavy-ion collisions. We utilise ESE by constructing a reference flow vector, $q_{2}$ that allows to characterise an event based on it's ellipticity. Applying this technique on a data set, simulated from a 3+1D viscous hydrodynamic model EPOS3, we study the event-shape dependent modifications to some of the bulk properties like, inclusive transverse momentum ($p_{T}$) spectra and $p_{T}$-differential $v_{2}$ for p-Pb collisions at 5.02 TeV. Selecting events on the basis of different magnitudes of reference flow vector $q_{2}$, we observe a hint of event-shape induced modifications of $v_{2}$ as a function of $p_{T}$ but, the inclusive $p_{T}$-spectra of charged particles seem to be insensitive to this event-shape selection. |
hep-ph/9511246 | Nikolai Kochelev | N.I.Kochelev | Anomalous violation of the OZI-rule in the $N\bar N\to \Phi\Phi$, $N\bar
N\to \Phi\gamma$ reactions and instantons | 13 pages, 3 figures | Phys.Atom.Nucl.59:1643-1647,1996; Yad.Fiz.59N9:1698-1702,1996 | null | Preprint IFUP-TH-59/95 | hep-ph | null | It is shown, that specific properties of the instanton induced interaction
between quarks leads to the anomalous violation of the OZI-rule in the $N\bar
N\to \Phi\Phi$, $N\bar N\to \Phi\gamma$ reactions. In the framework of
instanton model of the QCD vacuum, the energy dependence of the cross sections
of these reactions is calculated.
| [
{
"created": "Mon, 6 Nov 1995 19:56:56 GMT",
"version": "v1"
}
] | 2011-04-15 | [
[
"Kochelev",
"N. I.",
""
]
] | It is shown, that specific properties of the instanton induced interaction between quarks leads to the anomalous violation of the OZI-rule in the $N\bar N\to \Phi\Phi$, $N\bar N\to \Phi\gamma$ reactions. In the framework of instanton model of the QCD vacuum, the energy dependence of the cross sections of these reactions is calculated. |
0809.4787 | David McKeen | David McKeen | Constraining Light Bosons with Radiative $\Upsilon(1S)$ Decays | 8 pages, 16 figures, RevTeX; v2: published version | Phys.Rev.D79:015007,2009 | 10.1103/PhysRevD.79.015007 | EFI 08-27 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Light bosons can be found in large classes of theories beyond the Standard
Model. These light bosons may not be ruled out by current experiments and,
indeed, may even provide an explanation for some anomalous experimental
results. The radiative decays of quarkonium ($c \bar c, b \bar b$) states offer
a promising opportunity to investigate such light bosons. Specifically, we
investigate the reach that current CLEO data can have on models with light
scalar and pseudoscalar bosons.
| [
{
"created": "Sat, 27 Sep 2008 17:25:40 GMT",
"version": "v1"
},
{
"created": "Mon, 30 Mar 2009 18:28:09 GMT",
"version": "v2"
}
] | 2009-03-30 | [
[
"McKeen",
"David",
""
]
] | Light bosons can be found in large classes of theories beyond the Standard Model. These light bosons may not be ruled out by current experiments and, indeed, may even provide an explanation for some anomalous experimental results. The radiative decays of quarkonium ($c \bar c, b \bar b$) states offer a promising opportunity to investigate such light bosons. Specifically, we investigate the reach that current CLEO data can have on models with light scalar and pseudoscalar bosons. |
hep-ph/0002282 | Paolo Lipari | Paolo Lipari | The geometry of atmospheric neutrino production | 26 pages, 11 figures | Astropart.Phys.14:153-170,2000 | 10.1016/S0927-6505(00)00129-8 | null | hep-ph | null | The zenith angle distributions of atmospheric neutrinos are determined by the
possible presence of neutrino oscillations and the combination of three most
important contributions: (1) geomagnetic effects on the primary cosmic rays,
that suppress the primary flux in the Earth's magnetic equatorial region, (2)
the zenith angle dependence of the neutrino yields, due to the fact that
inclined showers produce more neutrinos, and (3) geometrical effects due to the
spherical shell geometry of the neutrino production volume. The last effect has
been recognized only recently and results in an important enhancement of the
flux of sub--GeV neutrinos for horizontal directions. In this work we discuss
the geometrical effect and its relevance in the interpretation of the
atmospheric neutrino data.
| [
{
"created": "Sun, 27 Feb 2000 09:09:39 GMT",
"version": "v1"
}
] | 2011-05-23 | [
[
"Lipari",
"Paolo",
""
]
] | The zenith angle distributions of atmospheric neutrinos are determined by the possible presence of neutrino oscillations and the combination of three most important contributions: (1) geomagnetic effects on the primary cosmic rays, that suppress the primary flux in the Earth's magnetic equatorial region, (2) the zenith angle dependence of the neutrino yields, due to the fact that inclined showers produce more neutrinos, and (3) geometrical effects due to the spherical shell geometry of the neutrino production volume. The last effect has been recognized only recently and results in an important enhancement of the flux of sub--GeV neutrinos for horizontal directions. In this work we discuss the geometrical effect and its relevance in the interpretation of the atmospheric neutrino data. |
hep-ph/9702231 | J. W. F. Valle | J. W. F. Valle (U. Valencia-IFIC/CIC) | Neutrinos and Physics Beyond the Standard Model | Invited talk at KEK 4th Topical Conference on Flavor Physics, October
1996, to be published by Nuclear Physics Proceedings Supplements, latex file,
14 pages, including 9 figures, uses psfig.sty and espcrc2.sty | Nucl.Phys.Proc.Suppl.59:249-261,1997 | 10.1016/S0920-5632(97)00449-0 | FTUV/97-5; IFIC/97-5 | hep-ph astro-ph | null | A brief sketch is made of the present observational status of neutrino
physics, with emphasis on the hints that follow from solar and atmospheric
neutrino observations, as well as cosmological data on the amplitude of
primordial density fluctuations. I also briefly review the ways to account for
the observed anomalies and some of their implications.
| [
{
"created": "Mon, 3 Feb 1997 18:12:54 GMT",
"version": "v1"
}
] | 2009-09-17 | [
[
"Valle",
"J. W. F.",
"",
"U. Valencia-IFIC/CIC"
]
] | A brief sketch is made of the present observational status of neutrino physics, with emphasis on the hints that follow from solar and atmospheric neutrino observations, as well as cosmological data on the amplitude of primordial density fluctuations. I also briefly review the ways to account for the observed anomalies and some of their implications. |
hep-ph/0211452 | H. C. G. Caldas | H.C. de Godoy Caldas and M. Hott | Analytic Properties of Thermal Corrected Boson Propagators | 11 pages, no figures, revtex, typos corrected, two references
included, to be published in Phys. Rev. D | Phys.Rev. D67 (2003) 045011 | 10.1103/PhysRevD.67.045011 | null | hep-ph | null | We investigate the analytic properties of finite-temperature self-energies of
bosons interacting with fermions at one-loop order. A simple boson-fermion
model was chosen due to its interesting features of having two distinct
couplings of bosons with fermions. This leads to a quite different analytic
behavior of the bosons self-energies as the external momentum
$K^{\mu}=(k^{0},\vec{k})$ approaches zero in the two possible limits. It is
shown that the plasmon and Debye masses are consistently obtained at the pole
of the corrected propagator even when the self-energy is analytic at the origin
in the frequency-momentum space.
| [
{
"created": "Thu, 28 Nov 2002 22:27:35 GMT",
"version": "v1"
},
{
"created": "Tue, 4 Feb 2003 23:33:13 GMT",
"version": "v2"
}
] | 2009-11-07 | [
[
"Caldas",
"H. C. de Godoy",
""
],
[
"Hott",
"M.",
""
]
] | We investigate the analytic properties of finite-temperature self-energies of bosons interacting with fermions at one-loop order. A simple boson-fermion model was chosen due to its interesting features of having two distinct couplings of bosons with fermions. This leads to a quite different analytic behavior of the bosons self-energies as the external momentum $K^{\mu}=(k^{0},\vec{k})$ approaches zero in the two possible limits. It is shown that the plasmon and Debye masses are consistently obtained at the pole of the corrected propagator even when the self-energy is analytic at the origin in the frequency-momentum space. |
1812.05102 | Nirmal Raj | David McKeen, Nirmal Raj | Monochromatic dark neutrinos and boosted dark matter in noble liquid
direct detection | 13 pages revtex4, 6 figures | Phys. Rev. D 99, 103003 (2019) | 10.1103/PhysRevD.99.103003 | null | hep-ph astro-ph.HE hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | If dark matter self-annihilates into neutrinos or a second component of
("boosted") dark matter that is nucleophilic, the annihilation products may be
detected with high rates via coherent nuclear scattering. A future
multi-ten-tonne liquid xenon detector such as DARWIN, and a multi-hundred-tonne
liquid argon detector, ARGO, would be sensitive to the flux of these particles
in complementary ranges of $10-1000$ MeV dark matter masses. We derive these
sensitivities after accounting for atmospheric and diffuse supernova neutrino
backgrounds, and realistic nuclear recoil acceptances. We find that their
constraints on the dark neutrino flux may surpass neutrino detectors such as
Super-Kamiokande, and that they would extensively probe parametric regions that
explain the missing satellites problem in neutrino portal models. The XENON1T
and Borexino experiments currently restrict the effective baryonic coupling of
thermal boosted dark matter to $\lesssim 10-100 \ \times$ the weak interaction,
but DARWIN and ARGO would probe down to couplings 10 times smaller. Detection
of boosted dark matter with baryonic couplings $\sim 10^{-3}-10^{-2} \ \times$
the weak coupling could indicate that the dark matter density profile in the
centers of galactic halos become cored, rather than cuspy, through
annihilations. This work demonstrates that, alongside liquid xenon, liquid
argon direct detection technology would emerge a major player in dark matter
searches within and beyond the WIMP paradigm.
| [
{
"created": "Wed, 12 Dec 2018 19:00:00 GMT",
"version": "v1"
}
] | 2019-05-22 | [
[
"McKeen",
"David",
""
],
[
"Raj",
"Nirmal",
""
]
] | If dark matter self-annihilates into neutrinos or a second component of ("boosted") dark matter that is nucleophilic, the annihilation products may be detected with high rates via coherent nuclear scattering. A future multi-ten-tonne liquid xenon detector such as DARWIN, and a multi-hundred-tonne liquid argon detector, ARGO, would be sensitive to the flux of these particles in complementary ranges of $10-1000$ MeV dark matter masses. We derive these sensitivities after accounting for atmospheric and diffuse supernova neutrino backgrounds, and realistic nuclear recoil acceptances. We find that their constraints on the dark neutrino flux may surpass neutrino detectors such as Super-Kamiokande, and that they would extensively probe parametric regions that explain the missing satellites problem in neutrino portal models. The XENON1T and Borexino experiments currently restrict the effective baryonic coupling of thermal boosted dark matter to $\lesssim 10-100 \ \times$ the weak interaction, but DARWIN and ARGO would probe down to couplings 10 times smaller. Detection of boosted dark matter with baryonic couplings $\sim 10^{-3}-10^{-2} \ \times$ the weak coupling could indicate that the dark matter density profile in the centers of galactic halos become cored, rather than cuspy, through annihilations. This work demonstrates that, alongside liquid xenon, liquid argon direct detection technology would emerge a major player in dark matter searches within and beyond the WIMP paradigm. |
1202.0021 | Bengt Friman | Bengt Friman | Phase transitions at finite density | 10 pages, 8 figures, Presented at the HIC for FAIR Workshop and
XXVIII Max Born Symposium "Three days on Quarkyonic Island", Wroclaw, Poland,
19-21 May, 2011, reference corrected, two typos corrected | null | null | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | I discuss the analytic structure of thermodynamic quantities for complex
values of thermodynamic variables within Landau theory. In particular, the
singularities connected with phase transitions of second order, first order and
cross over types are examined. A conformal mapping is introduced, which may be
used to explore the thermodynamics of strongly interacting matter at finite
values of the baryon chemical potential $\mu$ starting from lattice QCD results
at $\mu^{2}\leq 0$. This method allows us to improve the convergence of a
Taylor expansion about $\mu=0$ and to enhance the sensitivity to physical
singularities in the complex $\mu$ plane. The technique is illustrated by an
application to a second-order transition in a chiral effective model.
| [
{
"created": "Tue, 31 Jan 2012 21:10:43 GMT",
"version": "v1"
},
{
"created": "Thu, 2 Feb 2012 09:33:25 GMT",
"version": "v2"
},
{
"created": "Mon, 1 Jul 2013 12:21:08 GMT",
"version": "v3"
}
] | 2013-07-02 | [
[
"Friman",
"Bengt",
""
]
] | I discuss the analytic structure of thermodynamic quantities for complex values of thermodynamic variables within Landau theory. In particular, the singularities connected with phase transitions of second order, first order and cross over types are examined. A conformal mapping is introduced, which may be used to explore the thermodynamics of strongly interacting matter at finite values of the baryon chemical potential $\mu$ starting from lattice QCD results at $\mu^{2}\leq 0$. This method allows us to improve the convergence of a Taylor expansion about $\mu=0$ and to enhance the sensitivity to physical singularities in the complex $\mu$ plane. The technique is illustrated by an application to a second-order transition in a chiral effective model. |
1710.11206 | Jack Setford | Jack Setford | Composite Higgs models in disguise | null | null | 10.1007/JHEP01(2018)092 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present a mechanism for disguising one composite Higgs model as another.
Allowing the global symmetry of the strong sector to be broken by large mixings
with elementary fields, we show that we can disguise one coset $\mathcal
G/\mathcal H$ such that at low energies the phenomenology of the model is
better described with a different coset $\mathcal G'/\mathcal H'$. Extra scalar
fields acquire masses comparable to the rest of the strong sector resonances
and therefore are no longer considered pNGBs. Following this procedure we
demonstrate that two models with promising UV-completions can be disguised as
the more minimal $SO(5)/SO(4)$ coset.
| [
{
"created": "Mon, 30 Oct 2017 19:22:49 GMT",
"version": "v1"
},
{
"created": "Thu, 11 Jan 2018 12:00:24 GMT",
"version": "v2"
}
] | 2018-02-14 | [
[
"Setford",
"Jack",
""
]
] | We present a mechanism for disguising one composite Higgs model as another. Allowing the global symmetry of the strong sector to be broken by large mixings with elementary fields, we show that we can disguise one coset $\mathcal G/\mathcal H$ such that at low energies the phenomenology of the model is better described with a different coset $\mathcal G'/\mathcal H'$. Extra scalar fields acquire masses comparable to the rest of the strong sector resonances and therefore are no longer considered pNGBs. Following this procedure we demonstrate that two models with promising UV-completions can be disguised as the more minimal $SO(5)/SO(4)$ coset. |
2404.06523 | Han Zhang | Yao Yu, Han Zhang, Bai-Cian Ke | A Novel Model-Independent Approach to Explore New Physics in Five-body
Semileptonic Decays | arXiv admin note: text overlap with arXiv:2404.04816 | null | null | null | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We derive three parameters associated with the angular distribution of
semileptonic five-body decays $D_{(s)}/B_{(s)}\to
V\ell^+\nu_{\ell}\,(\ell=e,\mu,\tau)$ with $V\to PPP$, where $V$ and $P$ denote
vector and pseudo-scalar particles. These parameters, expected to be unity in
the Standard Model, may deviate if new physics is involved. Our
model-independent approach involves deriving the specific form of the angular
distribution under the most general form of the decay matrix element
$D_{(s)}/B_{(s)}\to V$. The outcomes have potential applications in precisely
testing the Standard Model and exploring new physics. Relevant measurements can
be carried out using data obtained from BESIII, Belle~II, and LHCb.
| [
{
"created": "Tue, 9 Apr 2024 03:24:56 GMT",
"version": "v1"
}
] | 2024-04-11 | [
[
"Yu",
"Yao",
""
],
[
"Zhang",
"Han",
""
],
[
"Ke",
"Bai-Cian",
""
]
] | We derive three parameters associated with the angular distribution of semileptonic five-body decays $D_{(s)}/B_{(s)}\to V\ell^+\nu_{\ell}\,(\ell=e,\mu,\tau)$ with $V\to PPP$, where $V$ and $P$ denote vector and pseudo-scalar particles. These parameters, expected to be unity in the Standard Model, may deviate if new physics is involved. Our model-independent approach involves deriving the specific form of the angular distribution under the most general form of the decay matrix element $D_{(s)}/B_{(s)}\to V$. The outcomes have potential applications in precisely testing the Standard Model and exploring new physics. Relevant measurements can be carried out using data obtained from BESIII, Belle~II, and LHCb. |
2205.15470 | Guo-Li Wang | Guo-Li Wang, Qiang Li, Tianhong Wang, Tai-Fu Feng, Xing-Gang Wu,
Chao-Hsi Chang | The solution to the `$1/2$ vs $3/2$' puzzle | 18 pages, 5 figures | Eur. Phys. J. C 82 (2022) 1027 | 10.1140/epjc/s10052-022-10997-4 | null | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Using an almost complete relativistic method based on the Bethe-Salpeter
equation, we study the mixing angle $\theta$, the mass splitting
$\bigtriangleup M$, the strong decay widths $\Gamma(D^{({\prime})}_1)$ and the
weak production rates $Br(B\to D^{({\prime})}_1\ell\nu_{\ell})$ of the
$D_1(2420)$ and $D_1^{\prime}(2430)$. We find there is the strong cancellation
between the $^1P_1$ and $^3P_1$ partial waves in $D_1^{\prime}(2430)$ with
$\theta \sim-35.3^{\circ}$, which leads to the `$1/2$ vs $3/2$' puzzle. The
puzzle can not be overcome by adding only relativistic corrections since in a
large parameter range where $\bigtriangleup M$ is linear varying and not small,
the $\theta$, $\Gamma(D^{({\prime})}_1)$ and $Br(B\to
D^{({\prime})}_1\ell\nu_{\ell})$ remain almost unchanged but conflict with
data. While in a special range around the mass inverse point where
$\bigtriangleup M=0$ and $\theta =\pm 90^{\circ}$, they change rapidly but we
find the windows where $\bigtriangleup M$, $\Gamma(D^{({\prime})}_1)$ and
$Br(B\to D^{({\prime})}_1\ell\nu_{\ell})$ are all consistent with data. The
small $\bigtriangleup M$ confirmed by experiment, is crucial to solve the
`$1/2$ vs $3/2$' puzzle.
| [
{
"created": "Mon, 30 May 2022 23:54:30 GMT",
"version": "v1"
},
{
"created": "Tue, 22 Nov 2022 13:17:33 GMT",
"version": "v2"
}
] | 2022-11-30 | [
[
"Wang",
"Guo-Li",
""
],
[
"Li",
"Qiang",
""
],
[
"Wang",
"Tianhong",
""
],
[
"Feng",
"Tai-Fu",
""
],
[
"Wu",
"Xing-Gang",
""
],
[
"Chang",
"Chao-Hsi",
""
]
] | Using an almost complete relativistic method based on the Bethe-Salpeter equation, we study the mixing angle $\theta$, the mass splitting $\bigtriangleup M$, the strong decay widths $\Gamma(D^{({\prime})}_1)$ and the weak production rates $Br(B\to D^{({\prime})}_1\ell\nu_{\ell})$ of the $D_1(2420)$ and $D_1^{\prime}(2430)$. We find there is the strong cancellation between the $^1P_1$ and $^3P_1$ partial waves in $D_1^{\prime}(2430)$ with $\theta \sim-35.3^{\circ}$, which leads to the `$1/2$ vs $3/2$' puzzle. The puzzle can not be overcome by adding only relativistic corrections since in a large parameter range where $\bigtriangleup M$ is linear varying and not small, the $\theta$, $\Gamma(D^{({\prime})}_1)$ and $Br(B\to D^{({\prime})}_1\ell\nu_{\ell})$ remain almost unchanged but conflict with data. While in a special range around the mass inverse point where $\bigtriangleup M=0$ and $\theta =\pm 90^{\circ}$, they change rapidly but we find the windows where $\bigtriangleup M$, $\Gamma(D^{({\prime})}_1)$ and $Br(B\to D^{({\prime})}_1\ell\nu_{\ell})$ are all consistent with data. The small $\bigtriangleup M$ confirmed by experiment, is crucial to solve the `$1/2$ vs $3/2$' puzzle. |
hep-ph/9808334 | Chang-Pu Sun | C.P.Sun and D.L.Zhou | Quantum decoherence effect and neutrino oscillation | Revtex 4 pages, address: Institute of Theoretical Physics, Academia
Sinica, Beijing, China; www: http://www.itp.ac.cn/~suncp | null | null | ITP-AC-quantum 98-10 | hep-ph hep-th quant-ph | null | In the view of the quantum dynamic theory of measurement developed from the
Hepp-Colemen (HC) model (K. Hepp, Hev.Phys.Acta, {\bf 45}, 237 (1972)), the
quantum decoherence in neutrino flavor oscillation caused by an environment
surrounding neutrinos is generally considered in this paper. The Ellis,
Hagelin, Nanopoulos and Srednicki (EHNS) mechanism for solving the solar
neutrino problem can be comprehended in a framework of the ordinary quantum
mechanics. In the weak- coupling limit, a microscopic model is proposed to
describe the transition of two neutrino system from a pure state to a mixed
state. It gives the modified formula of survival probability of neutrino
oscillation with two additional time-dependent parameters. For specified
environments, this result shows that the oscillating phenomena of neutrino
still exist even without a mass difference in free neutrino.
| [
{
"created": "Sat, 15 Aug 1998 09:05:03 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Sun",
"C. P.",
""
],
[
"Zhou",
"D. L.",
""
]
] | In the view of the quantum dynamic theory of measurement developed from the Hepp-Colemen (HC) model (K. Hepp, Hev.Phys.Acta, {\bf 45}, 237 (1972)), the quantum decoherence in neutrino flavor oscillation caused by an environment surrounding neutrinos is generally considered in this paper. The Ellis, Hagelin, Nanopoulos and Srednicki (EHNS) mechanism for solving the solar neutrino problem can be comprehended in a framework of the ordinary quantum mechanics. In the weak- coupling limit, a microscopic model is proposed to describe the transition of two neutrino system from a pure state to a mixed state. It gives the modified formula of survival probability of neutrino oscillation with two additional time-dependent parameters. For specified environments, this result shows that the oscillating phenomena of neutrino still exist even without a mass difference in free neutrino. |
hep-ph/0003247 | Carlos L. Schat | Carlos L. Schat (Rio de Janeiro, Faperj & Uerj) and Norberto N.
Scoccola (Buenos Aires, Conicet, Cnea & Favaloro U.) | Multibaryons in the collective coordinate approach to the SU(3) Skyrme
model | 16 pages, 1 figure | Phys.Rev.D62:074010,2000 | 10.1103/PhysRevD.62.074010 | TAN-FNT-00-03 | hep-ph nucl-th | null | We obtain the rotational spectrum of strange multibaryon states by performing
the SU(3) collective coordinate quantization of the static multi-Skyrmions.
These background configurations are given in terms of rational maps, which are
very good approximations and share the same symmetries as the exact solutions.
Thus, the allowed quantum numbers in the spectra and the structure of the
collective Hamiltonians we obtain are also valid in the exact case. We find
that the predicted spectra are in overall agreement with those corresponding to
the alternative bound state soliton model.
| [
{
"created": "Fri, 24 Mar 2000 19:59:24 GMT",
"version": "v1"
}
] | 2010-11-19 | [
[
"Schat",
"Carlos L.",
"",
"Rio de Janeiro, Faperj & Uerj"
],
[
"Scoccola",
"Norberto N.",
"",
"Buenos Aires, Conicet, Cnea & Favaloro U."
]
] | We obtain the rotational spectrum of strange multibaryon states by performing the SU(3) collective coordinate quantization of the static multi-Skyrmions. These background configurations are given in terms of rational maps, which are very good approximations and share the same symmetries as the exact solutions. Thus, the allowed quantum numbers in the spectra and the structure of the collective Hamiltonians we obtain are also valid in the exact case. We find that the predicted spectra are in overall agreement with those corresponding to the alternative bound state soliton model. |
hep-ph/0605230 | Alexei Martynenko | D.Ebert (Institut fur Physik, Humboldt U. zu Berlin), A.P.Martynenko
(Institut fur Physik, Humboldt U. zu Berlin and Samara State U.) | Relativistic effects in the production of pseudoscalar and vector doubly
heavy mesons from e^+e^- annihilation | 18 pages, 4 figures | Phys.Rev.D74:054008,2006 | 10.1103/PhysRevD.74.054008 | HU-EP-06/13 | hep-ph | null | On the basis of the perturbative QCD and the relativistic quark model we
investigate the relativistic and bound state effects in the production
processes of a pair of $S$-wave doubly heavy mesons with opposite charge
conjugation consisting of $b$ and $c$ quarks. All possible relativistic
corrections in the production amplitude including the terms connected with the
transformation law of the bound state wave function to the reference frame of
the moving pseudoscalar ${\cal P}-$ and vector ${\cal V}-$ mesons are taken
into account. We obtain a growth of the cross section for the reaction
$e^++e^-\to J/\Psi+ \eta_c$ due to considered effects by a factor $2\div 2.5$
in the range of the center-of-mass energy $\sqrt{s}=6\div 12$ GeV.
| [
{
"created": "Mon, 22 May 2006 12:43:07 GMT",
"version": "v1"
},
{
"created": "Mon, 29 May 2006 11:44:43 GMT",
"version": "v2"
}
] | 2008-11-26 | [
[
"Ebert",
"D.",
"",
"Institut fur Physik, Humboldt U. zu Berlin"
],
[
"Martynenko",
"A. P.",
"",
"Institut fur Physik, Humboldt U. zu Berlin and Samara State U."
]
] | On the basis of the perturbative QCD and the relativistic quark model we investigate the relativistic and bound state effects in the production processes of a pair of $S$-wave doubly heavy mesons with opposite charge conjugation consisting of $b$ and $c$ quarks. All possible relativistic corrections in the production amplitude including the terms connected with the transformation law of the bound state wave function to the reference frame of the moving pseudoscalar ${\cal P}-$ and vector ${\cal V}-$ mesons are taken into account. We obtain a growth of the cross section for the reaction $e^++e^-\to J/\Psi+ \eta_c$ due to considered effects by a factor $2\div 2.5$ in the range of the center-of-mass energy $\sqrt{s}=6\div 12$ GeV. |
0708.2328 | Maxim Dvornikov | Maxim Dvornikov (University of Jyv\"askyl\"a and IZMIRAN) | Neutrino oscillations in matter and in twisting magnetic fields | 13 pages, 1 eps figure, RevTeX4. The paper was significantly revised.
Title was changed, two new sections (Secs. IV and V), devoted to quantum
mechanical treatment of neutrino oscillations and possible applications, were
added. Many examples were included throughout the text. Final version to be
published in J. Phys. G | J.Phys.G35:025003,2008 | 10.1088/0954-3899/35/2/025003 | null | hep-ph hep-th | null | We find the solution to the Dirac equation for a massive neutrino with a
magnetic moment propagating in background matter and interacting with the
twisting magnetic field. In frames of the relativistic quantum mechanics
approach to the description of neutrino evolution we use the obtained solution
to derive neutrino wave functions satisfying the given initial condition. We
apply the results to the analysis of neutrino spin oscillations in matter under
the influence of the twisting magnetic field. Then on the basis of the yielded
results we describe spin-flavor oscillations of Dirac neutrinos that mix and
have non-vanishing matrix of magnetic moments. We again formulate the initial
condition problem, derive neutrinos wave functions and calculate the transition
probabilities for different magnetic moments matrices. The consistency of the
obtained results with the quantum mechanical treatment of spin-flavor
oscillations is discussed. We also consider several applications to
astrophysical and cosmological neutrinos.
| [
{
"created": "Fri, 17 Aug 2007 08:00:05 GMT",
"version": "v1"
},
{
"created": "Fri, 30 Nov 2007 13:08:23 GMT",
"version": "v2"
}
] | 2008-11-26 | [
[
"Dvornikov",
"Maxim",
"",
"University of Jyväskylä and IZMIRAN"
]
] | We find the solution to the Dirac equation for a massive neutrino with a magnetic moment propagating in background matter and interacting with the twisting magnetic field. In frames of the relativistic quantum mechanics approach to the description of neutrino evolution we use the obtained solution to derive neutrino wave functions satisfying the given initial condition. We apply the results to the analysis of neutrino spin oscillations in matter under the influence of the twisting magnetic field. Then on the basis of the yielded results we describe spin-flavor oscillations of Dirac neutrinos that mix and have non-vanishing matrix of magnetic moments. We again formulate the initial condition problem, derive neutrinos wave functions and calculate the transition probabilities for different magnetic moments matrices. The consistency of the obtained results with the quantum mechanical treatment of spin-flavor oscillations is discussed. We also consider several applications to astrophysical and cosmological neutrinos. |
hep-ph/9407308 | Denis Perret-Gallix | J. Fujimoto, T. Ishikawa, S. Kawabata, Y. Kurihara, Y. Shimizu D.
Perret-Gallix | Non-resonant diagrams in radiative four-fermion processes | 6 pages, latex, KEK-CP-015, KEK Preprint 94-46, LAPP-Exp.-94.09 | Nucl.Phys.Proc.Suppl. 37B (1994) 169 | 10.1016/0920-5632(94)90673-4 | null | hep-ph | null | The complete tree level cross section for $e^+e^- \to e^- \bar\nu_e u \bar{d}
\gamma$ is computed and discussed in comparison with the cross sections for
$e^+e^- \to e^- \bar\nu_e u \bar{d} $ and $e^+e^- \to \bar{u} d u \bar{d}$.
Event generators based on the GRACE package for the non-radiative and radiative
case are presented. Special interest is brought to the effect of the
non-resonant diagrams overlooked so far in other studies. Their contribution to
the total cross section is presented for the LEP II energy range and for future
linear colliders ($\sqrt s$ =500 GeV). Effects, at the W pair threshold, of
order 3\% ($e^- \bar\nu_e u \bar{d}$) and 27\% ($\bar{u} d u \bar{d}$) are
reported. Similar behaviour for the radiative case is shown. At $\sqrt s$ = 500
GeV, the relative contribution of the non-resonant diagrams for the radiative
channel reaches 42.5\%.
| [
{
"created": "Fri, 15 Jul 1994 16:26:43 GMT",
"version": "v1"
},
{
"created": "Wed, 20 Jul 1994 11:40:06 GMT",
"version": "v2"
},
{
"created": "Fri, 22 Jul 1994 22:09:27 GMT",
"version": "v3"
}
] | 2009-10-28 | [
[
"Fujimoto",
"J.",
""
],
[
"Ishikawa",
"T.",
""
],
[
"Kawabata",
"S.",
""
],
[
"Kurihara",
"Y.",
""
],
[
"Perret-Gallix",
"Y. Shimizu D.",
""
]
] | The complete tree level cross section for $e^+e^- \to e^- \bar\nu_e u \bar{d} \gamma$ is computed and discussed in comparison with the cross sections for $e^+e^- \to e^- \bar\nu_e u \bar{d} $ and $e^+e^- \to \bar{u} d u \bar{d}$. Event generators based on the GRACE package for the non-radiative and radiative case are presented. Special interest is brought to the effect of the non-resonant diagrams overlooked so far in other studies. Their contribution to the total cross section is presented for the LEP II energy range and for future linear colliders ($\sqrt s$ =500 GeV). Effects, at the W pair threshold, of order 3\% ($e^- \bar\nu_e u \bar{d}$) and 27\% ($\bar{u} d u \bar{d}$) are reported. Similar behaviour for the radiative case is shown. At $\sqrt s$ = 500 GeV, the relative contribution of the non-resonant diagrams for the radiative channel reaches 42.5\%. |
hep-ph/0209193 | Vladimir Smirnov | V.A. Smirnov | The Leading Power Regge Asymptotic Behaviour of Dimensionally
Regularized Massless On-Shell Planar Triple Box | 9 pages, LaTeX with axodraw.sty | Phys.Lett. B547 (2002) 239-244 | 10.1016/S0370-2693(02)02779-X | null | hep-ph | null | The leading power asymptotic behaviour of the dimensionally regularized
massless on-shell planar triple box diagram in the Regge limit t/s -> 0 is
analytically evaluated.
| [
{
"created": "Tue, 17 Sep 2002 17:20:38 GMT",
"version": "v1"
}
] | 2010-04-05 | [
[
"Smirnov",
"V. A.",
""
]
] | The leading power asymptotic behaviour of the dimensionally regularized massless on-shell planar triple box diagram in the Regge limit t/s -> 0 is analytically evaluated. |
hep-ph/0103028 | Haruhiko Terao | Tatsuo Kobayashi (Kyoto Univ.), Haruhiko Terao (Kanazawa Univ.) | Sfermion masses in Nelson-Strassler type of models: SUSY standard models
coupled with SCFTs | 28 pages, 8 figures, LaTeX file; corrected typos and references added | Phys.Rev. D64 (2001) 075003 | 10.1103/PhysRevD.64.075003 | KANAZAWA-01-02, KUNS-1710 | hep-ph hep-th | null | We study soft SUSY breaking parameters in the Nelson-Strassler type of
models: SUSY standard models coupled with SCFTs. In this type of models, soft
SUSY breaking parameters including sfermion masses can be suppressed around the
decoupling scale of SCFTs. We clarify the condition to derive exponential
suppression of sfermion masses within the framework of pure SCFTs. Such
behavior is favorable for degeneracy of sfermion masses. However, the realistic
sfermion masses are not quite degenerate due to the gauge couplings and the
gaugino masses in the SM sector. We show the sfermion mass spectrum obtained in
such models. The aspect of suppression for the soft SUSY breaking parameters is
also demonstrated in an explicit model. We also give a mechanism generating the
$\mu$-term of the Electro-Weak scale by a singlet field coupled with the SCFT.
| [
{
"created": "Fri, 2 Mar 2001 15:03:47 GMT",
"version": "v1"
},
{
"created": "Sat, 3 Mar 2001 02:47:26 GMT",
"version": "v2"
},
{
"created": "Wed, 7 Mar 2001 02:26:54 GMT",
"version": "v3"
}
] | 2009-11-07 | [
[
"Kobayashi",
"Tatsuo",
"",
"Kyoto Univ."
],
[
"Terao",
"Haruhiko",
"",
"Kanazawa Univ."
]
] | We study soft SUSY breaking parameters in the Nelson-Strassler type of models: SUSY standard models coupled with SCFTs. In this type of models, soft SUSY breaking parameters including sfermion masses can be suppressed around the decoupling scale of SCFTs. We clarify the condition to derive exponential suppression of sfermion masses within the framework of pure SCFTs. Such behavior is favorable for degeneracy of sfermion masses. However, the realistic sfermion masses are not quite degenerate due to the gauge couplings and the gaugino masses in the SM sector. We show the sfermion mass spectrum obtained in such models. The aspect of suppression for the soft SUSY breaking parameters is also demonstrated in an explicit model. We also give a mechanism generating the $\mu$-term of the Electro-Weak scale by a singlet field coupled with the SCFT. |
2003.01867 | Hang Zhou | Tian-Peng Tang, Hang Zhou, Ning Liu | Probing single stop production at the FCC-hh/SPPC | 15 pages, 5 figures, 1 table. Published version on NPB | null | null | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Top squark (stop) is a crucial part of supersymmetric models (SUSY) to
understand the naturalness problem. Other than the traditional stop pair
production, the single production via electroweak interaction provides signals
with distinctive features which could help confirm the existence of the top
squark. In this paper, we investigate the observability of stop through the
mono-top channel of the single stop production at the future proton-proton
colliders, FCC-hh and SPPC, in a simplified Minimal Supersymmetric Standard
Model (MSSM). With the integrated luminosity of 3000 $\text{fb}^{-1}$, we can
probe the stop with mass up to 3.25 TeV by the mono-top channel at $5\sigma$
level. Considering the systematic uncertainty of 10%, the exclusion limit for
stop mass can be reached at about 1.5 TeV. Exclusion limits on stop mass and
higgsino mass parameter $\mu$ are also presented.
| [
{
"created": "Wed, 4 Mar 2020 02:48:40 GMT",
"version": "v1"
},
{
"created": "Wed, 2 Sep 2020 06:59:24 GMT",
"version": "v2"
}
] | 2020-09-03 | [
[
"Tang",
"Tian-Peng",
""
],
[
"Zhou",
"Hang",
""
],
[
"Liu",
"Ning",
""
]
] | Top squark (stop) is a crucial part of supersymmetric models (SUSY) to understand the naturalness problem. Other than the traditional stop pair production, the single production via electroweak interaction provides signals with distinctive features which could help confirm the existence of the top squark. In this paper, we investigate the observability of stop through the mono-top channel of the single stop production at the future proton-proton colliders, FCC-hh and SPPC, in a simplified Minimal Supersymmetric Standard Model (MSSM). With the integrated luminosity of 3000 $\text{fb}^{-1}$, we can probe the stop with mass up to 3.25 TeV by the mono-top channel at $5\sigma$ level. Considering the systematic uncertainty of 10%, the exclusion limit for stop mass can be reached at about 1.5 TeV. Exclusion limits on stop mass and higgsino mass parameter $\mu$ are also presented. |
1502.04162 | Xin Liu | Xin Liu, Hsiang-nan Li, and Zhen-Jun Xiao | Transverse-momentum-dependent wave functions with Glauber gluons in $B
\to \pi \pi$, $\rho \rho$ decays | RevTex file, 11 pages, 4 figures, and 1 table, contents improved and
references added; matching the published version | Phys. Rev. D 91, 114019 (2015) | 10.1103/PhysRevD.91.114019 | null | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We investigate the Glauber-gluon effect on the $B \to \pi \pi$ and $\rho
\rho$ decays, which is introduced via a convolution of a universal Glauber
phase factor with transverse-momentum-dependent(TMD) meson wave functions in
the $k_T$ factorization theorem. For an appropriate parametrization of the
Glauber phase, it is observed that a TMD wave function for the pion ($\rho$
meson) with a weak (strong) falloff in parton transverse momentum $k_T$ leads
to significant (moderate) modification of the $B^0 \to \pi^0 \pi^0$ ($B^0 \to
\rho^0 \rho^0$) branching ratio: the former (latter) is enhanced (reduced) by
about a factor of 2 (15\%). This observation is consistent with the dual role
of the pion as a massless Nambu-Goldstone boson and as a $q \bar q$ bound
state, which requires a tighter spatial distribution of its leading Fock state
relative to higher Fock states. The agreement between the theoretical
predictions and the data for all the $B \to \pi \pi$ and $\rho^0 \rho^0$
branching ratios is then improved simultaneously, and it is possible to resolve
the $B \to \pi \pi$ puzzle.
| [
{
"created": "Sat, 14 Feb 2015 03:18:49 GMT",
"version": "v1"
},
{
"created": "Sat, 21 Feb 2015 16:53:56 GMT",
"version": "v2"
},
{
"created": "Fri, 12 Jun 2015 16:04:00 GMT",
"version": "v3"
}
] | 2015-06-17 | [
[
"Liu",
"Xin",
""
],
[
"Li",
"Hsiang-nan",
""
],
[
"Xiao",
"Zhen-Jun",
""
]
] | We investigate the Glauber-gluon effect on the $B \to \pi \pi$ and $\rho \rho$ decays, which is introduced via a convolution of a universal Glauber phase factor with transverse-momentum-dependent(TMD) meson wave functions in the $k_T$ factorization theorem. For an appropriate parametrization of the Glauber phase, it is observed that a TMD wave function for the pion ($\rho$ meson) with a weak (strong) falloff in parton transverse momentum $k_T$ leads to significant (moderate) modification of the $B^0 \to \pi^0 \pi^0$ ($B^0 \to \rho^0 \rho^0$) branching ratio: the former (latter) is enhanced (reduced) by about a factor of 2 (15\%). This observation is consistent with the dual role of the pion as a massless Nambu-Goldstone boson and as a $q \bar q$ bound state, which requires a tighter spatial distribution of its leading Fock state relative to higher Fock states. The agreement between the theoretical predictions and the data for all the $B \to \pi \pi$ and $\rho^0 \rho^0$ branching ratios is then improved simultaneously, and it is possible to resolve the $B \to \pi \pi$ puzzle. |
2106.09439 | Artur Amorim | Artur Amorim and Miguel S. Costa and Robert C. Quevedo | Deeply Virtual Compton Scattering in Improved Holographic QCD | 12 pages, 5 figures, accepted in Physics Letters B | Physics Letters B, Volume 819, 10 August 2021, 136451 | 10.1016/j.physletb.2021.136451 | null | hep-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present our current progress in the holographic computation of the
scattering amplitude for Deeply Virtual Compton Scattering (DVCS) processe, as
a function of the Mandelstam invariant $t$. We show that it is possible to
describe simultaneously the differential cross-section and total cross-section
of DVCS data with a single holographic model for the pomeron. Using data from
H1-ZEUS we obtained a $\chi^2_{dof} \sim 1.5$ for the best fit to the data.
| [
{
"created": "Thu, 17 Jun 2021 12:43:05 GMT",
"version": "v1"
}
] | 2021-07-07 | [
[
"Amorim",
"Artur",
""
],
[
"Costa",
"Miguel S.",
""
],
[
"Quevedo",
"Robert C.",
""
]
] | We present our current progress in the holographic computation of the scattering amplitude for Deeply Virtual Compton Scattering (DVCS) processe, as a function of the Mandelstam invariant $t$. We show that it is possible to describe simultaneously the differential cross-section and total cross-section of DVCS data with a single holographic model for the pomeron. Using data from H1-ZEUS we obtained a $\chi^2_{dof} \sim 1.5$ for the best fit to the data. |
hep-ph/0509295 | Brian Patt | Brian Patt, David Tucker-Smith, Frank Wilczek | Example of a Hidden Flavor Sector | null | null | null | MIT-CTP-3687 | hep-ph | null | We exemplify earlier general considerations on flavor symmetry breaking
employing a hidden sector and exploiting supersymmetry in a specific model. The
model is at best a caricature of reality, but it is sufficient to display
mechanisms for the natural emergence of minimal low-energy Higgs structure,
non-trivial texture zeros and symmetry, and coupling to the standard model only
through Higgs fields, which could be considerably more general.
| [
{
"created": "Mon, 26 Sep 2005 22:58:09 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Patt",
"Brian",
""
],
[
"Tucker-Smith",
"David",
""
],
[
"Wilczek",
"Frank",
""
]
] | We exemplify earlier general considerations on flavor symmetry breaking employing a hidden sector and exploiting supersymmetry in a specific model. The model is at best a caricature of reality, but it is sufficient to display mechanisms for the natural emergence of minimal low-energy Higgs structure, non-trivial texture zeros and symmetry, and coupling to the standard model only through Higgs fields, which could be considerably more general. |
2011.14883 | Maxim Dvornikov | Maxim Dvornikov and Victor B. Semikoz (IZMIRAN) | Birefringence of electromagnetic waves in the relic neutrino gas | 12 pages in Latex, 1 eps figure, JCAP LaTeX style; title has been
changed, minor corrections in the text; version published in JCAP | JCAP 03 (2021) 028 | 10.1088/1475-7516/2021/03/028 | null | hep-ph astro-ph.CO | http://creativecommons.org/licenses/by/4.0/ | We reconsider the problem of the birefringence of electromagnetic (EM) waves
in a medium consisting of a plasma and a $\nu\bar{\nu}$-gas within the Standard
Model of particle physics. The considered effect arises in such a medium due to
the parity violation for the electroweak neutrino-electron interaction. Our
recent calculations of the electroweak correction to the photon polarization
operator in the electroweak plasma allow us to significantly improve some
previous estimates of such effect in astrophysics. We estimate the rotary power
for EM waves propagating in a non-relativistic plasma in the intergalactic
space and interacting with the gas of relic neutrinos and antineutrinos there.
We show that, in presence of a plasma, the EM wave birefringence effect in a
$\nu\bar{\nu}$-gas exceeds significantly that effect in a $\nu\bar{\nu}$-gas in
empty space considered earlier. These previous treatments of the birefringence
relied on the calculations of the refraction index for on-shell photons in
vacuum using the forward scattering amplitude $\gamma\nu\to \gamma\nu$ with
virtual charged leptons in Feynman diagrams. The possibility to observe
experimentally the new effect suggested here is discussed.
| [
{
"created": "Mon, 30 Nov 2020 15:24:45 GMT",
"version": "v1"
},
{
"created": "Tue, 1 Dec 2020 02:43:20 GMT",
"version": "v2"
},
{
"created": "Thu, 25 Mar 2021 11:05:10 GMT",
"version": "v3"
}
] | 2021-03-26 | [
[
"Dvornikov",
"Maxim",
"",
"IZMIRAN"
],
[
"Semikoz",
"Victor B.",
"",
"IZMIRAN"
]
] | We reconsider the problem of the birefringence of electromagnetic (EM) waves in a medium consisting of a plasma and a $\nu\bar{\nu}$-gas within the Standard Model of particle physics. The considered effect arises in such a medium due to the parity violation for the electroweak neutrino-electron interaction. Our recent calculations of the electroweak correction to the photon polarization operator in the electroweak plasma allow us to significantly improve some previous estimates of such effect in astrophysics. We estimate the rotary power for EM waves propagating in a non-relativistic plasma in the intergalactic space and interacting with the gas of relic neutrinos and antineutrinos there. We show that, in presence of a plasma, the EM wave birefringence effect in a $\nu\bar{\nu}$-gas exceeds significantly that effect in a $\nu\bar{\nu}$-gas in empty space considered earlier. These previous treatments of the birefringence relied on the calculations of the refraction index for on-shell photons in vacuum using the forward scattering amplitude $\gamma\nu\to \gamma\nu$ with virtual charged leptons in Feynman diagrams. The possibility to observe experimentally the new effect suggested here is discussed. |
hep-ph/0404196 | Guy D. Moore | Olivier Gagnon, Guy D. Moore | Limits on Lorentz Violation from the Highest Energy Cosmic Rays | 24 pages, no figures. Added references, very slight changes. Version
published in Physical Review D | Phys.Rev. D70 (2004) 065002 | 10.1103/PhysRevD.70.065002 | null | hep-ph astro-ph gr-qc | null | We place several new limits on Lorentz violating effects, which can modify
particles' dispersion relations, by considering the highest energy cosmic rays
observed. Since these are hadrons, this involves considering the partonic
content of such cosmic rays. We get a number of bounds on differences in
maximum propagation speeds, which are typically bounded at the 10^{-21} level,
and on momentum dependent dispersion corrections of the form v = 1 +-
p^2/Lambda^2, which typically bound Lambda > 10^{21} GeV, well above the Planck
scale. For (CPT violating) dispersion correction of the form v = 1 + p/Lambda,
the bounds are up to 15 orders of magnitude beyond the Planck scale.
| [
{
"created": "Thu, 22 Apr 2004 17:42:28 GMT",
"version": "v1"
},
{
"created": "Tue, 24 Aug 2004 14:01:16 GMT",
"version": "v2"
}
] | 2009-11-10 | [
[
"Gagnon",
"Olivier",
""
],
[
"Moore",
"Guy D.",
""
]
] | We place several new limits on Lorentz violating effects, which can modify particles' dispersion relations, by considering the highest energy cosmic rays observed. Since these are hadrons, this involves considering the partonic content of such cosmic rays. We get a number of bounds on differences in maximum propagation speeds, which are typically bounded at the 10^{-21} level, and on momentum dependent dispersion corrections of the form v = 1 +- p^2/Lambda^2, which typically bound Lambda > 10^{21} GeV, well above the Planck scale. For (CPT violating) dispersion correction of the form v = 1 + p/Lambda, the bounds are up to 15 orders of magnitude beyond the Planck scale. |
hep-ph/0110351 | Czyz Henryk | M.Czachor and H.Czyz | Why and how to use a differential equation method to calculate
multi-loop integrals | 9 p., presented at XXV International Conference on Theoretical
Physics "Particle Physics and Astrophysics in the Standard Models and
Beyond", Ustron, Poland, September 2001 | Acta Phys.Polon.B32:3823,2001 | null | null | hep-ph | null | A short pedagogical introduction to a differential method used to calculate
multi-loop scalar integrals is presented. As an example it is shown how to
obtain, using the method, large mass expansion of the two loop sunrise master
integrals.
| [
{
"created": "Fri, 26 Oct 2001 14:56:45 GMT",
"version": "v1"
}
] | 2011-03-17 | [
[
"Czachor",
"M.",
""
],
[
"Czyz",
"H.",
""
]
] | A short pedagogical introduction to a differential method used to calculate multi-loop scalar integrals is presented. As an example it is shown how to obtain, using the method, large mass expansion of the two loop sunrise master integrals. |
1705.02184 | Anton Chudaykin A. S. | F. Bezrukov, A. Chudaykin, D. Gorbunov | Hiding an elephant: heavy sterile neutrino with large mixing angle does
not contradict cosmology | 14 pages, 5 figures, v3: corrected important typo in formula (4.3)
and updated corresponding figure, without changes to the results of the paper | JCAP 06, 051 (2017) | 10.1088/1475-7516/2017/06/051 | INR-TH-2017-013 | hep-ph astro-ph.CO hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study a model of a keV-scale sterile neutrino with a relatively large
mixing with the Standard Model sector. Usual considerations predict active
generation of such particles in the early Universe, which leads to constraints
from the total Dark Matter density and absence of X-ray signal from sterile
neutrino decay. These bounds together may deem any attempt of creation of the
keV scale sterile neutrino in the laboratory unfeasible. We argue that for
models with a hidden sector coupled to the sterile neutrino these bounds can be
evaded, opening new perspectives for the direct studies at neutrino experiments
such as Troitsk $\nu$-mass and KATRIN. We estimate the generation of sterile
neutrinos in scenarios with the hidden sector dynamics keeping the sterile
neutrinos either massless or superheavy in the early Universe. In both cases
the generation by oscillations from active neutrinos in plasma is suppressed.
| [
{
"created": "Fri, 5 May 2017 12:12:31 GMT",
"version": "v1"
},
{
"created": "Mon, 10 Jul 2017 21:55:24 GMT",
"version": "v2"
},
{
"created": "Wed, 3 Apr 2019 10:42:58 GMT",
"version": "v3"
}
] | 2019-04-04 | [
[
"Bezrukov",
"F.",
""
],
[
"Chudaykin",
"A.",
""
],
[
"Gorbunov",
"D.",
""
]
] | We study a model of a keV-scale sterile neutrino with a relatively large mixing with the Standard Model sector. Usual considerations predict active generation of such particles in the early Universe, which leads to constraints from the total Dark Matter density and absence of X-ray signal from sterile neutrino decay. These bounds together may deem any attempt of creation of the keV scale sterile neutrino in the laboratory unfeasible. We argue that for models with a hidden sector coupled to the sterile neutrino these bounds can be evaded, opening new perspectives for the direct studies at neutrino experiments such as Troitsk $\nu$-mass and KATRIN. We estimate the generation of sterile neutrinos in scenarios with the hidden sector dynamics keeping the sterile neutrinos either massless or superheavy in the early Universe. In both cases the generation by oscillations from active neutrinos in plasma is suppressed. |
0811.1002 | Yubing Dong | Y. B. Dong | Target mass corrections to matrix elements in nucleon spin structure
functions | 7 pages and 2 figures | Phys.Rev.C78:028201,2008 | 10.1103/PhysRevC.78.028201 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Target mass corrections to the twist-4 terms $\tilde f_2^{p,n,d}$ as well as
to the leading-twist $\tilde a_2$ are discussed.
| [
{
"created": "Thu, 6 Nov 2008 17:33:12 GMT",
"version": "v1"
}
] | 2008-12-18 | [
[
"Dong",
"Y. B.",
""
]
] | Target mass corrections to the twist-4 terms $\tilde f_2^{p,n,d}$ as well as to the leading-twist $\tilde a_2$ are discussed. |
hep-ph/9806331 | Howard E. Haber | Howard E. Haber | Probing the MSSM Higgs Sector at an e-e- Collider | 14 pages, needs e-e-ijmpa.sty and psfig.sty, to appear in the
Proceedings of e-e- 97, International Journal of Modern Physics A, Special
Proceedings Issue, June 1998 | Int.J.Mod.Phys.A13:2263-2276,1998 | 10.1142/S0217751X98001062 | SCIPP 98/10 | hep-ph | null | The theoretical structure of the Higgs sector of the Minimal Supersymmetric
Standard Model (MSSM) is briefly described. An outline of Higgs phenomenology
at future lepton colliders is presented, and some opportunities for probing the
physics of the MSSM Higgs sector at an e-e- collider are considered.
| [
{
"created": "Wed, 10 Jun 1998 01:06:34 GMT",
"version": "v1"
}
] | 2011-04-15 | [
[
"Haber",
"Howard E.",
""
]
] | The theoretical structure of the Higgs sector of the Minimal Supersymmetric Standard Model (MSSM) is briefly described. An outline of Higgs phenomenology at future lepton colliders is presented, and some opportunities for probing the physics of the MSSM Higgs sector at an e-e- collider are considered. |
1210.2628 | Thomas Hahn | S. Agrawal, T. Hahn, E. Mirabella | FormCalc 7.5 | 11 pages, Proceedings contribution to Loops and Legs in Quantum Field
Theory, April 15-20, 2012, Wernigerode, Germany | null | null | MPP-2012-136 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present additions and improvements in Version 7.5 of FormCalc, most
notably OPP methods, Output in C, MSSM initialization via FeynHiggs, and
Analytic tensor reduction, as well as a parallelized Cuba library for numerical
integration.
| [
{
"created": "Tue, 9 Oct 2012 15:03:12 GMT",
"version": "v1"
}
] | 2012-10-10 | [
[
"Agrawal",
"S.",
""
],
[
"Hahn",
"T.",
""
],
[
"Mirabella",
"E.",
""
]
] | We present additions and improvements in Version 7.5 of FormCalc, most notably OPP methods, Output in C, MSSM initialization via FeynHiggs, and Analytic tensor reduction, as well as a parallelized Cuba library for numerical integration. |
1011.2263 | Zhi-Qing Zhang | Zhi-Qing Zhang | Study of f_0(980) and f_0(1500) from B_s \to f_0(980)\pi, f_0(1500)\pi
Decays | 16 pages, 3 figures, Revtex | Eur.Phys.J.C69:433-443,2010 | 10.1140/epjc/s10052-010-1422-3 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper, we analyze the scalar mesons $f_0(980)$ and $f_0(1500)$ from
the decays $\bar B^0_s \to f_0(980)\pi^0, f_0(1500)\pi^0$ within Perturbative
QCD approach. From the leading order calculations, we find that (a) in the
allowed mixing angle ranges, the branching ratio of $\bar B^0_s\to
f_0(980)\pi^0$ is about $(1.0\sim1.6)\times 10^{-7}$, which is smaller than
that of $\bar B^0_s\to f_0(980)K^0$ (the difference is a few times even one
order); (b) the decay $\bar B^0_s \to f_0(1500)\pi^0$ is better to distinguish
between the lowest lying state or the first excited state for $f_0(1500)$,
because the branching ratios for two scenarios have about one-order difference
in most of the mixing angle ranges; and (c) the direct CP asymmetries of $\bar
B^0_s \to f_0(1500)\pi^0$ for two scenarios also exists great difference. In
scenario II, the variation range of the value ${\cal A} ^{dir}_{CP}(\bar B^0_s
\to f_0(1500)\pi^0)$ according to the mixing angle is very small, except for
the values corresponding to the mixing angles being near $90^\circ$ or
$270^\circ$, while the variation range of ${\cal A} ^{dir}_{CP}(\bar B^0_s \to
f_0(1500)\pi^0)$ in scenario I is very large. Compared with the future data for
the decay $\bar B^0_s \to f_0(1500)\pi^0$, it is ease to determine the nature
of the scalar meson $f_0(1500)$.
| [
{
"created": "Wed, 10 Nov 2010 02:57:26 GMT",
"version": "v1"
}
] | 2010-12-09 | [
[
"Zhang",
"Zhi-Qing",
""
]
] | In this paper, we analyze the scalar mesons $f_0(980)$ and $f_0(1500)$ from the decays $\bar B^0_s \to f_0(980)\pi^0, f_0(1500)\pi^0$ within Perturbative QCD approach. From the leading order calculations, we find that (a) in the allowed mixing angle ranges, the branching ratio of $\bar B^0_s\to f_0(980)\pi^0$ is about $(1.0\sim1.6)\times 10^{-7}$, which is smaller than that of $\bar B^0_s\to f_0(980)K^0$ (the difference is a few times even one order); (b) the decay $\bar B^0_s \to f_0(1500)\pi^0$ is better to distinguish between the lowest lying state or the first excited state for $f_0(1500)$, because the branching ratios for two scenarios have about one-order difference in most of the mixing angle ranges; and (c) the direct CP asymmetries of $\bar B^0_s \to f_0(1500)\pi^0$ for two scenarios also exists great difference. In scenario II, the variation range of the value ${\cal A} ^{dir}_{CP}(\bar B^0_s \to f_0(1500)\pi^0)$ according to the mixing angle is very small, except for the values corresponding to the mixing angles being near $90^\circ$ or $270^\circ$, while the variation range of ${\cal A} ^{dir}_{CP}(\bar B^0_s \to f_0(1500)\pi^0)$ in scenario I is very large. Compared with the future data for the decay $\bar B^0_s \to f_0(1500)\pi^0$, it is ease to determine the nature of the scalar meson $f_0(1500)$. |
1604.02903 | Sergey Afonin | S. S. Afonin | Soft-wall modelling of meson spectra | 6 pages, presented at Excited QCD 2016 (Costa da Caparica, Portugal,
March 2016) | null | null | null | hep-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The holographic methods inspired by the gauge/gravity correspondence from
string theory have been actively applied to the hadron spectroscopy in the last
eleven years. Within the phenomenological bottom-up approach, the linear
Regge-like trajectories for light mesons are naturally reproduced in the
so-called "Soft-wall" holographic models. I will give a very short review of
the underlying ideas and technical aspects related to the meson spectroscopy. A
generalization of soft-wall description of Regge trajectories to arbitrary
intercept is proposed. The problem of incorporation of the chiral symmetry
breaking is discussed.
| [
{
"created": "Mon, 11 Apr 2016 12:02:18 GMT",
"version": "v1"
},
{
"created": "Thu, 14 Apr 2016 11:45:07 GMT",
"version": "v2"
}
] | 2016-04-15 | [
[
"Afonin",
"S. S.",
""
]
] | The holographic methods inspired by the gauge/gravity correspondence from string theory have been actively applied to the hadron spectroscopy in the last eleven years. Within the phenomenological bottom-up approach, the linear Regge-like trajectories for light mesons are naturally reproduced in the so-called "Soft-wall" holographic models. I will give a very short review of the underlying ideas and technical aspects related to the meson spectroscopy. A generalization of soft-wall description of Regge trajectories to arbitrary intercept is proposed. The problem of incorporation of the chiral symmetry breaking is discussed. |
1105.2209 | Andrew Akeroyd | A.G. Akeroyd, Hiroaki Sugiyama | Production of doubly charged scalars from the decay of singly charged
scalars in the Higgs Triplet Model | 13 pages, 3 figures, two figures added in v2, to appear in Physical
Review D | Phys.Rev.D84:035010,2011 | 10.1103/PhysRevD.84.035010 | SHEP-11-09 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The existence of doubly charged Higgs bosons (H^{\pm\pm}) is a distinctive
feature of the Higgs Triplet Model (HTM), in which neutrinos obtain tree-level
masses from the vacuum expectation value of a neutral scalar in a triplet
representation of SU(2)_L. We point out that a large branching ratio for the
decay of a singly charged Higgs boson to a doubly charged Higgs boson via
H^\pm\to H^{\pm\pm}W^* is possible in a sizeable parameter space of the HTM.
From the production mechanism q'qbar\to W^* \to H^{\pm\pm}H^\mp the above decay
mode would give rise to pair production of H^{\pm\pm}, with a cross section
which can be comparable to that of the standard pair-production mechanism
qqbar\to \gamma^*,Z^* \to H^{++}H^{--}. We suggest that the presence of a
sizeable branching ratio for H^\pm\to H^{\pm\pm}W^* could significantly enhance
the detection prospects of H^{\pm\pm} in the four-lepton channel. Moreover, the
decays H^0\to H^\pm W^* and A^0\to H^\pm W^* from production of the neutral
triplet scalars H^0 and A^0 would also provide an additional source of H^\pm,
which can subsequently decay to H^{\pm\pm}.
| [
{
"created": "Wed, 11 May 2011 14:39:58 GMT",
"version": "v1"
},
{
"created": "Fri, 26 Aug 2011 09:41:16 GMT",
"version": "v2"
}
] | 2011-09-08 | [
[
"Akeroyd",
"A. G.",
""
],
[
"Sugiyama",
"Hiroaki",
""
]
] | The existence of doubly charged Higgs bosons (H^{\pm\pm}) is a distinctive feature of the Higgs Triplet Model (HTM), in which neutrinos obtain tree-level masses from the vacuum expectation value of a neutral scalar in a triplet representation of SU(2)_L. We point out that a large branching ratio for the decay of a singly charged Higgs boson to a doubly charged Higgs boson via H^\pm\to H^{\pm\pm}W^* is possible in a sizeable parameter space of the HTM. From the production mechanism q'qbar\to W^* \to H^{\pm\pm}H^\mp the above decay mode would give rise to pair production of H^{\pm\pm}, with a cross section which can be comparable to that of the standard pair-production mechanism qqbar\to \gamma^*,Z^* \to H^{++}H^{--}. We suggest that the presence of a sizeable branching ratio for H^\pm\to H^{\pm\pm}W^* could significantly enhance the detection prospects of H^{\pm\pm} in the four-lepton channel. Moreover, the decays H^0\to H^\pm W^* and A^0\to H^\pm W^* from production of the neutral triplet scalars H^0 and A^0 would also provide an additional source of H^\pm, which can subsequently decay to H^{\pm\pm}. |
1303.3723 | Jennifer Girrbach | Andrzej J. Buras, Fulvia De Fazio, Jennifer Girrbach, Robert Knegjens
and Minoru Nagai | The Anatomy of Neutral Scalars with FCNCs in the Flavour Precision Era | 69 pages, 23 figures; some clarifying statements added; version
accepted for publication in JHEP. arXiv admin note: substantial text overlap
with arXiv:1211.1896 | JHEP 1306 (2013) 111 | 10.1007/JHEP06(2013)111 | FLAVOUR(267104)-ERC-38, BARI-TH/13-671, Nikhef-2013-008, UT-13-09 | hep-ph hep-ex hep-lat | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In many extensions of the Standard Model flavour changing neutral current
processes can be mediated by tree-level heavy neutral scalars and/or
pseudo-scalars H^0(A^0). This generally introduces new sources of flavour
violation and CP violation as well as left-handed and right-handed scalar
currents. These new physics contributions imply a pattern of deviations from SM
expectations for FCNC processes that depends only on the couplings of H^0(A^0)
to fermions and on their masses. In situations in which a single H^0 or A^0
dominates NP contributions stringent correlations between Delta F=2 and Delta
F=1 observables exist. Anticipating the Flavour Precision Era ahead of us we
illustrate this by searching for allowed oases in the landscape of a given
model assuming significantly smaller uncertainties in CKM and hadronic
parameters than presently available. To this end we analyze Delta F=2
observables in B^0_{s,d}-bar B^0_{s,d} and K^0-bar K^0 systems and rare B and K
decays with charged leptons in the final state including both left-handed and
right-handed scalar couplings of H^0 and A^0 to quarks in various combinations.
We identify a number of correlations between various flavour observables that
could test and distinguish these different scenarios. The prominent role of the
decays B_{s,d}-> mu^+ mu^- in these studies is emphasized. Imposing the
existing flavour constraints, a rich pattern of deviations from the SM
expectations in rare B_{s,d} decays emerges provided M_H< 1 TeV. NP effects in
rare K decays are very small. Neutral SM Higgs contributions to rare B and K
decays turn out to be negligible once the constraints from Delta F=2 processes
are taken into account. Finally, we point out striking differences between the
correlations found here and in scenarios in which tree-level FCNC are mediated
by a new neutral gauge boson Z'.
| [
{
"created": "Fri, 15 Mar 2013 10:29:32 GMT",
"version": "v1"
},
{
"created": "Wed, 5 Jun 2013 13:55:15 GMT",
"version": "v2"
}
] | 2013-07-09 | [
[
"Buras",
"Andrzej J.",
""
],
[
"De Fazio",
"Fulvia",
""
],
[
"Girrbach",
"Jennifer",
""
],
[
"Knegjens",
"Robert",
""
],
[
"Nagai",
"Minoru",
""
]
] | In many extensions of the Standard Model flavour changing neutral current processes can be mediated by tree-level heavy neutral scalars and/or pseudo-scalars H^0(A^0). This generally introduces new sources of flavour violation and CP violation as well as left-handed and right-handed scalar currents. These new physics contributions imply a pattern of deviations from SM expectations for FCNC processes that depends only on the couplings of H^0(A^0) to fermions and on their masses. In situations in which a single H^0 or A^0 dominates NP contributions stringent correlations between Delta F=2 and Delta F=1 observables exist. Anticipating the Flavour Precision Era ahead of us we illustrate this by searching for allowed oases in the landscape of a given model assuming significantly smaller uncertainties in CKM and hadronic parameters than presently available. To this end we analyze Delta F=2 observables in B^0_{s,d}-bar B^0_{s,d} and K^0-bar K^0 systems and rare B and K decays with charged leptons in the final state including both left-handed and right-handed scalar couplings of H^0 and A^0 to quarks in various combinations. We identify a number of correlations between various flavour observables that could test and distinguish these different scenarios. The prominent role of the decays B_{s,d}-> mu^+ mu^- in these studies is emphasized. Imposing the existing flavour constraints, a rich pattern of deviations from the SM expectations in rare B_{s,d} decays emerges provided M_H< 1 TeV. NP effects in rare K decays are very small. Neutral SM Higgs contributions to rare B and K decays turn out to be negligible once the constraints from Delta F=2 processes are taken into account. Finally, we point out striking differences between the correlations found here and in scenarios in which tree-level FCNC are mediated by a new neutral gauge boson Z'. |
0803.1692 | Bo-Qiang Ma | Bing Zhang, Zhun Lu, Bo-Qiang Ma, Ivan Schmidt | Extracting Boer-Mulders functions from $p+D$ Drell-Yan processes | 5 latex pages, 6 figures, correction made in acknowledgement | Phys.Rev.D77:054011,2008 | 10.1103/PhysRevD.77.054011 | null | hep-ph | http://creativecommons.org/licenses/by-nc-sa/3.0/ | We extract the Boer-Mulders functions of valence and sea quarks in the proton
from unpolarized $p+D$ Drell-Yan data measured by the FNAL E866 Collaboration.
Using these Boer-Mulders functions, we calculate the $\cos 2 \phi$ asymmetries
in unpolarized $pp$ Drell-Yan processes, both for the FNAL E866/NuSea and the
BNL Relativistic Heavy Ion Collider (RHIC) experiments. We also estimate the
$\cos 2 \phi$ asymmetries in the unpolarized $p\bar{p}$ Drell-Yan processes at
GSI.
| [
{
"created": "Wed, 12 Mar 2008 01:50:08 GMT",
"version": "v1"
},
{
"created": "Wed, 14 May 2008 12:30:12 GMT",
"version": "v2"
}
] | 2008-11-26 | [
[
"Zhang",
"Bing",
""
],
[
"Lu",
"Zhun",
""
],
[
"Ma",
"Bo-Qiang",
""
],
[
"Schmidt",
"Ivan",
""
]
] | We extract the Boer-Mulders functions of valence and sea quarks in the proton from unpolarized $p+D$ Drell-Yan data measured by the FNAL E866 Collaboration. Using these Boer-Mulders functions, we calculate the $\cos 2 \phi$ asymmetries in unpolarized $pp$ Drell-Yan processes, both for the FNAL E866/NuSea and the BNL Relativistic Heavy Ion Collider (RHIC) experiments. We also estimate the $\cos 2 \phi$ asymmetries in the unpolarized $p\bar{p}$ Drell-Yan processes at GSI. |
1708.06621 | Mohamed Abu-Shady | M. Abu-Shady | Thermo-magnetic Effects in an External Magnetic Field in the
Logarithmic-Quark Sigma Model | 15 pages, 8 figures. arXiv admin note: substantial text overlap with
arXiv:1612.03437, arXiv:1507.01372 | International Journal of Modern Physics and Application 2017;
4(6): 49-54 | null | null | hep-ph | http://creativecommons.org/licenses/by/4.0/ | The phenomenon of magnetic catalysis of chiral symmetry breaking in the
quantum chromodynamic theory in the framework of logarithmic quark sigma model
is studied. Thermodynamic properties are calculated in the mean-field
approximation such as the pressure, the entropy density, the energy density,
and measure interaction. The pressure, the entropy density, and the energy
density increase with increasing temperature and an external magnetic field.
The critical temperature increases with increasing an external magnetic field.
In addition, the chiral phase transition is crossover in the presence of an
external magnetic field with absent of baryonic chemical potential when
explicit symmetry breaking is included. A comparison is presented with the
original sigma model and other works. A conclusion indicates that the
logarithmic quark model enhances the magnetic catalysis phenomenon.
| [
{
"created": "Fri, 18 Aug 2017 19:55:58 GMT",
"version": "v1"
}
] | 2018-01-23 | [
[
"Abu-Shady",
"M.",
""
]
] | The phenomenon of magnetic catalysis of chiral symmetry breaking in the quantum chromodynamic theory in the framework of logarithmic quark sigma model is studied. Thermodynamic properties are calculated in the mean-field approximation such as the pressure, the entropy density, the energy density, and measure interaction. The pressure, the entropy density, and the energy density increase with increasing temperature and an external magnetic field. The critical temperature increases with increasing an external magnetic field. In addition, the chiral phase transition is crossover in the presence of an external magnetic field with absent of baryonic chemical potential when explicit symmetry breaking is included. A comparison is presented with the original sigma model and other works. A conclusion indicates that the logarithmic quark model enhances the magnetic catalysis phenomenon. |
hep-ph/0502176 | Graham D. Kribs | Hooman Davoudiasl, Ryuichiro Kitano, Graham D. Kribs, Hitoshi Murayama | Models of Neutrino Mass with a Low Cutoff Scale | 11 pages, 4 figures | Phys.Rev.D71:113004,2005 | 10.1103/PhysRevD.71.113004 | null | hep-ph | null | In theories with a low quantum gravity scale, global symmetries are expected
to be violated, inducing excessive proton decay or large Majorana neutrino
masses. The simplest cure is to impose discrete gauge symmetries, which in turn
make neutrinos massless. We construct models that employ these gauge symmetries
while naturally generating small neutrino masses. Majorana (Dirac) neutrino
masses are generated through the breaking of a discrete (continuous) gauge
symmetry at low energies, e.g., 2 keV to 1 GeV. The Majorana case predicts
\Delta N_\nu \simeq 1 at BBN, neutrinoless double beta decay with scalar
emission, and modifications to the CMB anisotropies from domain walls in the
universe as well as providing a possible Dark Energy candidate. For the Dirac
case, despite the presence of a new light gauge boson, all laboratory,
astrophysical, and cosmological constraints can be avoided.
| [
{
"created": "Fri, 18 Feb 2005 21:16:03 GMT",
"version": "v1"
}
] | 2009-09-29 | [
[
"Davoudiasl",
"Hooman",
""
],
[
"Kitano",
"Ryuichiro",
""
],
[
"Kribs",
"Graham D.",
""
],
[
"Murayama",
"Hitoshi",
""
]
] | In theories with a low quantum gravity scale, global symmetries are expected to be violated, inducing excessive proton decay or large Majorana neutrino masses. The simplest cure is to impose discrete gauge symmetries, which in turn make neutrinos massless. We construct models that employ these gauge symmetries while naturally generating small neutrino masses. Majorana (Dirac) neutrino masses are generated through the breaking of a discrete (continuous) gauge symmetry at low energies, e.g., 2 keV to 1 GeV. The Majorana case predicts \Delta N_\nu \simeq 1 at BBN, neutrinoless double beta decay with scalar emission, and modifications to the CMB anisotropies from domain walls in the universe as well as providing a possible Dark Energy candidate. For the Dirac case, despite the presence of a new light gauge boson, all laboratory, astrophysical, and cosmological constraints can be avoided. |
1402.1256 | Vien Vo Van | V. V. Vien and H. N. Long | The T7 flavor symmetry in 3-3-1 model with neutral leptons | 39 pages, 16 figures. arXiv admin note: substantial text overlap with
arXiv:1312.5034; and text overlap with arXiv:1304.0921, arXiv:1306.4138,
arXiv:1311.6729, arXiv:1310.4614 by other authors | JHEP04(2014)133 | 10.1007/JHEP04(2014)133 | null | hep-ph | http://creativecommons.org/licenses/by/3.0/ | We construct a 3-3-1 model based on non-Abelian discrete symmetry $T_7$
responsible for the fermion masses. Neutrinos get masses from only anti-sextets
which are in triplets $\underline{3}$ and $\underline{3}^*$ under $T_7$. The
flavor mixing patterns and mass splitting are obtained without perturbation.
The tribimaximal form obtained with the breaking $T_7 \rightarrow Z_3$ in
charged lepton sector and both $T_7 \rightarrow Z_3$ and $Z_3 \rightarrow
\{\mathrm{Identity}\}$ must be taken place in neutrino sector but only apart in
breakings $Z_3 \rightarrow \{\mathrm{Identity}\}$ (without contribution of
$\si'$), and the upper bound on neutrino mass $\sum_{i=1}^3m_i$ at the level is
presented. The Dirac CP violation phase $\delta$ is predicted to either
$\frac{\pi}{2}$ or $\frac{3\pi}{2}$ which is maximal CP violation. From the
Dirac CP violation phase we obtain the relation between Euler's angles which is
consistent with the experimental in PDG 2012. On the other hand, the realistic
lepton mixing can be obtained if both the direction for breakings $T_7
\rightarrow Z_3$ and $Z_3 \rightarrow \{\mathrm{Identity}\}$ are taken place in
neutrino sectors. The CKM matrix is the identity matrix at the tree-level.
| [
{
"created": "Thu, 6 Feb 2014 06:10:14 GMT",
"version": "v1"
},
{
"created": "Mon, 24 Feb 2014 04:59:03 GMT",
"version": "v2"
},
{
"created": "Mon, 28 Apr 2014 14:39:58 GMT",
"version": "v3"
}
] | 2014-04-29 | [
[
"Vien",
"V. V.",
""
],
[
"Long",
"H. N.",
""
]
] | We construct a 3-3-1 model based on non-Abelian discrete symmetry $T_7$ responsible for the fermion masses. Neutrinos get masses from only anti-sextets which are in triplets $\underline{3}$ and $\underline{3}^*$ under $T_7$. The flavor mixing patterns and mass splitting are obtained without perturbation. The tribimaximal form obtained with the breaking $T_7 \rightarrow Z_3$ in charged lepton sector and both $T_7 \rightarrow Z_3$ and $Z_3 \rightarrow \{\mathrm{Identity}\}$ must be taken place in neutrino sector but only apart in breakings $Z_3 \rightarrow \{\mathrm{Identity}\}$ (without contribution of $\si'$), and the upper bound on neutrino mass $\sum_{i=1}^3m_i$ at the level is presented. The Dirac CP violation phase $\delta$ is predicted to either $\frac{\pi}{2}$ or $\frac{3\pi}{2}$ which is maximal CP violation. From the Dirac CP violation phase we obtain the relation between Euler's angles which is consistent with the experimental in PDG 2012. On the other hand, the realistic lepton mixing can be obtained if both the direction for breakings $T_7 \rightarrow Z_3$ and $Z_3 \rightarrow \{\mathrm{Identity}\}$ are taken place in neutrino sectors. The CKM matrix is the identity matrix at the tree-level. |
1001.1935 | Michael Spira | David Noth, Michael Spira | Supersymmetric Higgs Yukawa Couplings to Bottom Quarks at
next-to-next-to-leading Order | 25 pages, 9 figures, added comments and references, typos corrected,
results unchanged, published version | JHEP 1106:084,2011 | 10.1007/JHEP06(2011)084 | PSI-PR-10-01 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The effective bottom Yukawa couplings are analyzed for the minimal
supersymmetric extension of the Standard Model at two-loop accuracy within
SUSY-QCD. They include the resummation of the dominant corrections for large
values of tg(beta). In particular the two-loop SUSY-QCD corrections to the
leading SUSY-QCD and top-induced SUSY-electroweak contributions are addressed.
The residual theoretical uncertainties range at the per-cent level.
| [
{
"created": "Tue, 12 Jan 2010 16:08:12 GMT",
"version": "v1"
},
{
"created": "Mon, 20 Jun 2011 12:37:59 GMT",
"version": "v2"
}
] | 2011-06-24 | [
[
"Noth",
"David",
""
],
[
"Spira",
"Michael",
""
]
] | The effective bottom Yukawa couplings are analyzed for the minimal supersymmetric extension of the Standard Model at two-loop accuracy within SUSY-QCD. They include the resummation of the dominant corrections for large values of tg(beta). In particular the two-loop SUSY-QCD corrections to the leading SUSY-QCD and top-induced SUSY-electroweak contributions are addressed. The residual theoretical uncertainties range at the per-cent level. |
2311.18607 | Bronislav Zakharov | B.G. Zakharov | Effect of color randomization on $p_T$ broadening of fast partons in
turbulent quark-gluon plasma | 17 pages, 7 figures | null | null | null | hep-ph nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We analyze the effect of the parton color randomization on $p_T$ broadening
in the quark-gluon plasma with turbulent color fields. We calculate the
transport coefficient for a simplified model of fluctuating color fields in the
form of alternating sequential transverse layers with homogenous transverse
chromomagnetic fields with random orientation in the SU(3) group and gaussian
distribution in the magnitude. Our numerical results show that the color
randomization can lead to a sizable reduction of the turbulent contribution to
$\hat{q}$. The magnitude of the effect grows with increasing ratio of the
electric and magnetic screening masses.
| [
{
"created": "Thu, 30 Nov 2023 15:05:02 GMT",
"version": "v1"
}
] | 2023-12-01 | [
[
"Zakharov",
"B. G.",
""
]
] | We analyze the effect of the parton color randomization on $p_T$ broadening in the quark-gluon plasma with turbulent color fields. We calculate the transport coefficient for a simplified model of fluctuating color fields in the form of alternating sequential transverse layers with homogenous transverse chromomagnetic fields with random orientation in the SU(3) group and gaussian distribution in the magnitude. Our numerical results show that the color randomization can lead to a sizable reduction of the turbulent contribution to $\hat{q}$. The magnitude of the effect grows with increasing ratio of the electric and magnetic screening masses. |
0810.0189 | Tomo Takahashi | Takeo Moroi and Tomo Takahashi | Non-Gaussianity and Baryonic Isocurvature Fluctuations in the Curvaton
Scenario | 14 pages, 3 figures, published version | Phys.Lett.B671:339-344,2009 | 10.1016/j.physletb.2008.12.034 | null | hep-ph astro-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We discuss non-Gaussianity and baryonic isocurvature fluctuations in the
curvaton scenario, assuming that the baryon asymmetry of the universe
originates only from the decay products of the inflaton. When large
non-Gaussianity is realized in such a scenario, non-vanishing baryonic
isocurvature fluctuations can also be generated unless the baryogenesis occurs
after the decay of the curvaton. We calculate the non-linearity parameter f_NL
and the baryonic isocurvature fluctuations, taking account of the primordial
fluctuations of both the inflaton and the curvaton. We show that, although
current constraints on isocurvature fluctuations are severe, the non-linearity
parameter can be large as f_NL \sim O(10-100) without conflicting with the
constraints.
| [
{
"created": "Wed, 1 Oct 2008 15:05:31 GMT",
"version": "v1"
},
{
"created": "Mon, 15 Dec 2008 10:02:16 GMT",
"version": "v2"
}
] | 2009-02-02 | [
[
"Moroi",
"Takeo",
""
],
[
"Takahashi",
"Tomo",
""
]
] | We discuss non-Gaussianity and baryonic isocurvature fluctuations in the curvaton scenario, assuming that the baryon asymmetry of the universe originates only from the decay products of the inflaton. When large non-Gaussianity is realized in such a scenario, non-vanishing baryonic isocurvature fluctuations can also be generated unless the baryogenesis occurs after the decay of the curvaton. We calculate the non-linearity parameter f_NL and the baryonic isocurvature fluctuations, taking account of the primordial fluctuations of both the inflaton and the curvaton. We show that, although current constraints on isocurvature fluctuations are severe, the non-linearity parameter can be large as f_NL \sim O(10-100) without conflicting with the constraints. |
0911.3840 | Jeremy Miller | Jeremy Miller | Pomeron loop summation in perturbative QCD and the survival probability | 11 pages, 6 figures | null | null | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The survival probability for exclusive diffractive Higgs production is
calculated. The contribution of short distance interactions are taken into
account, by summing over Pomeron loops in perturbative QCD. The summation is
performed by developing an iterative technique to sum over loop diagrams with
higher and higher generations of loops. The results show that the survival
probability depends inversely on energy and is small for the LHC range of
energies, and could be even less than 1 %.
| [
{
"created": "Thu, 19 Nov 2009 17:06:02 GMT",
"version": "v1"
}
] | 2009-11-20 | [
[
"Miller",
"Jeremy",
""
]
] | The survival probability for exclusive diffractive Higgs production is calculated. The contribution of short distance interactions are taken into account, by summing over Pomeron loops in perturbative QCD. The summation is performed by developing an iterative technique to sum over loop diagrams with higher and higher generations of loops. The results show that the survival probability depends inversely on energy and is small for the LHC range of energies, and could be even less than 1 %. |
hep-ph/0002211 | Adrian Ghinculov | Adrian Ghinculov (UCLA), York-Peng Yao (U. of Michigan) | Exact O(g^2 alpha_s) top decay width from general massive two-loop
integrals | null | Mod.Phys.Lett. A15 (2000) 925-930 | 10.1142/S021773230000092X | UCLA-00-TEP-7, UM-TH-00-03 | hep-ph | null | We calculate the b-dependent self-energy of the top quark at O(g^2 \alpha_s)
by using a general massive two-loop algorithm proposed in a previous article.
From this we derive by unitarity the O(\alpha_s) radiative corrections to the
decay width of the top quark, where all effects associated with the $b$ quark
mass are included without resorting to a mass expansion. Our results agree with
the analytical results available for the O(\alpha_s) correction to the top
quark width.
| [
{
"created": "Sat, 19 Feb 2000 01:42:39 GMT",
"version": "v1"
}
] | 2016-12-21 | [
[
"Ghinculov",
"Adrian",
"",
"UCLA"
],
[
"Yao",
"York-Peng",
"",
"U. of Michigan"
]
] | We calculate the b-dependent self-energy of the top quark at O(g^2 \alpha_s) by using a general massive two-loop algorithm proposed in a previous article. From this we derive by unitarity the O(\alpha_s) radiative corrections to the decay width of the top quark, where all effects associated with the $b$ quark mass are included without resorting to a mass expansion. Our results agree with the analytical results available for the O(\alpha_s) correction to the top quark width. |
hep-ph/9506325 | Nikolaos Ganoulis | G. Lazarides, C. Panagiotakopoulos | Smooth Hybrid Inflation | 15 pages, latex, to appear in Phys. Rev. D (Rapid Com.) | Phys.Rev.D52:R559-563,1995; Phys.Rev.D52:559,1995 | 10.1103/PhysRevD.52.R559 | UT-STPD-1-95 | hep-ph | null | We propose a variant of hybrid inflation which is applicable in a wide class
of supersymmetric grand unified models. The observed temperature perturbations
of cosmic background radiation can be reproduced with natural values of the
parameters of the theory and a grand unification scale which is consistent with
the unification of the minimal supersymmetric standard model gauge couplings as
measured at LEP. The termination of inflation is smooth and does not produce
any topological defects. Finally, we present a specific supersymmetric model
where our smooth hybrid inflationary scenario is realized.
| [
{
"created": "Wed, 14 Jun 1995 10:40:21 GMT",
"version": "v1"
}
] | 2019-08-15 | [
[
"Lazarides",
"G.",
""
],
[
"Panagiotakopoulos",
"C.",
""
]
] | We propose a variant of hybrid inflation which is applicable in a wide class of supersymmetric grand unified models. The observed temperature perturbations of cosmic background radiation can be reproduced with natural values of the parameters of the theory and a grand unification scale which is consistent with the unification of the minimal supersymmetric standard model gauge couplings as measured at LEP. The termination of inflation is smooth and does not produce any topological defects. Finally, we present a specific supersymmetric model where our smooth hybrid inflationary scenario is realized. |
hep-ph/9504361 | Martin Moosburger | V.V. Vereshagin, A.N.Manashov (St. Petersburg State University, St.
Petersburg, Russia), S.G. Sherman (St. Petersburg Nuclear Physics Institute),
U. Bohnert, M. Dillig, W. Eyrich, O. Jaekel, M. Moosburger (Universitaet
Erlangen-Nuernberg, Germany) | Analysis of data on low energy piN-->pipiN reaction. I. Total cross
sections | 45 pages | Nucl.Phys. A592 (1995) 413-442 | 10.1016/0375-9474(95)00216-N | Er-SPb-1 | hep-ph nucl-th | null | This is the first of a series of papers on a consistent model independent
analysis of the complete experimental information on the reaction $\pi N
\rightarrow \pi \pi N$ at pion momenta up to 500 MeV/c. The paper summarizes
the theoretical approach and details of the computational procedure. The
complete database on total cross sections in 5 $\pi \pi N$ channels is given
together with a critical discussion of their model independent analysis.
| [
{
"created": "Fri, 21 Apr 1995 16:24:40 GMT",
"version": "v1"
}
] | 2009-10-28 | [
[
"Vereshagin",
"V. V.",
"",
"St. Petersburg State University, St.\n Petersburg, Russia"
],
[
"Manashov",
"A. N.",
"",
"St. Petersburg State University, St.\n Petersburg, Russia"
],
[
"Sherman",
"S. G.",
"",
"St. Petersburg Nuclear Physics Institute"
],
... | This is the first of a series of papers on a consistent model independent analysis of the complete experimental information on the reaction $\pi N \rightarrow \pi \pi N$ at pion momenta up to 500 MeV/c. The paper summarizes the theoretical approach and details of the computational procedure. The complete database on total cross sections in 5 $\pi \pi N$ channels is given together with a critical discussion of their model independent analysis. |
1405.5627 | Gang Lv | Gang L\"u, Jia-Qi Lei, Xin-Heng Guo, Zhen-Hua Zhang, Ke-Wei Wei | $CP$ violation for $B^{0}\rightarrow \rho^{0}(\omega)\rho^{0}(\omega)
\rightarrow \pi^+\pi^-\pi^+\pi^-$ in QCD factorization | arXiv admin note: text overlap with arXiv:0805.0329, arXiv:1010.3309
by other authors | null | null | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In the QCD factorization (QCDF) approach we study the direct $CP$ violation
in
$\bar{B}^{0}\rightarrow\rho^0(\omega)\rho^0(\omega)\rightarrow\pi^+\pi^-\pi^+\pi^-$
via the $\rho-\omega$ mixing mechanism. We find that the $CP$ violation can be
enhanced by double $\rho-\omega$ mixing when the masses of the $\pi^+\pi^-$
pairs are in the vicinity of the $\omega$ resonance, and the maximum $CP$
violation can reach 28{\%}. We also compare the results from the naive
factorization and the QCD factorization.
| [
{
"created": "Thu, 22 May 2014 04:01:14 GMT",
"version": "v1"
}
] | 2014-05-23 | [
[
"Lü",
"Gang",
""
],
[
"Lei",
"Jia-Qi",
""
],
[
"Guo",
"Xin-Heng",
""
],
[
"Zhang",
"Zhen-Hua",
""
],
[
"Wei",
"Ke-Wei",
""
]
] | In the QCD factorization (QCDF) approach we study the direct $CP$ violation in $\bar{B}^{0}\rightarrow\rho^0(\omega)\rho^0(\omega)\rightarrow\pi^+\pi^-\pi^+\pi^-$ via the $\rho-\omega$ mixing mechanism. We find that the $CP$ violation can be enhanced by double $\rho-\omega$ mixing when the masses of the $\pi^+\pi^-$ pairs are in the vicinity of the $\omega$ resonance, and the maximum $CP$ violation can reach 28{\%}. We also compare the results from the naive factorization and the QCD factorization. |
hep-ph/0402127 | Raymond F. Sawyer | R. F. Sawyer | Polarization precession in photon-photon encounters | 4 pages. Added: Mention of earlier work by Kotkin and Serbo with
results equivalent to those of our first section | null | null | null | hep-ph | null | We calculate the rate of precession of the direction of polarization of a
photon traversing a sea of plane-polarized photons moving in the opposed
direction, where the interaction is the one-loop "vacuum" Heisenberg-Euler
coupling of four fields. Substantial precession can take place in a distance
many orders of magnitude shorter than the free path for photon-photon
scattering, mediated by the same interaction. We consider briefly the
possibility of some interesting collective effects in the case in which instead
of a particle and a sea, two seas are caused to collide.
| [
{
"created": "Wed, 11 Feb 2004 22:13:47 GMT",
"version": "v1"
},
{
"created": "Wed, 18 Feb 2004 19:09:11 GMT",
"version": "v2"
}
] | 2007-05-23 | [
[
"Sawyer",
"R. F.",
""
]
] | We calculate the rate of precession of the direction of polarization of a photon traversing a sea of plane-polarized photons moving in the opposed direction, where the interaction is the one-loop "vacuum" Heisenberg-Euler coupling of four fields. Substantial precession can take place in a distance many orders of magnitude shorter than the free path for photon-photon scattering, mediated by the same interaction. We consider briefly the possibility of some interesting collective effects in the case in which instead of a particle and a sea, two seas are caused to collide. |
1201.6175 | Marco Frasca | Marco Frasca | Parameters of NJL models for a generic representation of the gauge group | 6 pages, no figure | null | null | null | hep-ph hep-lat | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We generalize a non-local Nambu-Jona-Lasinio model to a generic
representation of the gauge group. The critical temperature is given in a
closed form as a function of the parameters of the theory and the cut-off. This
result is generally useful in the understanding of QCD-like theories and their
thermodynamical behavior.
| [
{
"created": "Mon, 30 Jan 2012 11:30:43 GMT",
"version": "v1"
}
] | 2012-01-31 | [
[
"Frasca",
"Marco",
""
]
] | We generalize a non-local Nambu-Jona-Lasinio model to a generic representation of the gauge group. The critical temperature is given in a closed form as a function of the parameters of the theory and the cut-off. This result is generally useful in the understanding of QCD-like theories and their thermodynamical behavior. |
hep-ph/0202258 | Tomohiro Matsuda | Tomohiro Matsuda | Enhanced baryon number violation due to cosmological defects with
localized fermions along extra dimension | 12pages, latex2e, added references, to appear in PRD | Phys.Rev. D65 (2002) 107302 | 10.1103/PhysRevD.65.107302 | null | hep-ph astro-ph hep-th | null | We propose a new scenario of baryon number violation in models with extra
dimensions. In the true vacuum, baryon number is almost conserved due to the
localization mechanism of matter fields, which suppresses the interactions
between quarks and leptons. We consider several types of cosmological defects
in four-dimensional spacetime that shift the center of the localized matter
fields, and show that the magnitudes of the baryon number violating
interactions are well enhanced. Application to baryogenesis is also discussed.
| [
{
"created": "Wed, 27 Feb 2002 09:31:12 GMT",
"version": "v1"
},
{
"created": "Fri, 1 Mar 2002 06:21:51 GMT",
"version": "v2"
},
{
"created": "Mon, 18 Mar 2002 05:38:12 GMT",
"version": "v3"
}
] | 2009-11-07 | [
[
"Matsuda",
"Tomohiro",
""
]
] | We propose a new scenario of baryon number violation in models with extra dimensions. In the true vacuum, baryon number is almost conserved due to the localization mechanism of matter fields, which suppresses the interactions between quarks and leptons. We consider several types of cosmological defects in four-dimensional spacetime that shift the center of the localized matter fields, and show that the magnitudes of the baryon number violating interactions are well enhanced. Application to baryogenesis is also discussed. |
1605.05059 | Javier Menendez | J. Men\'endez | What do we know about neutrinoless double-beta decay nuclear matrix
elements? | Talk presented at NuPhys2015 (London, 16-18 December 2015). 8 pages,
4 figures | null | null | NuPhys2015-Menendez | hep-ph hep-ex nucl-ex nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The detection of neutrinoless double-beta decay will establish the Majorana
nature of neutrinos. In addition, if the nuclear matrix elements of this
process are reliably known, the experimental lifetime will provide precious
information about the absolute neutrino masses and hierarchy. I review the
status of nuclear structure calculations for neutrinoless double-beta decay
matrix elements, and discuss some key issues to be addressed in order to meet
the demand for accurate nuclear matrix elements.
| [
{
"created": "Tue, 17 May 2016 08:52:16 GMT",
"version": "v1"
}
] | 2016-05-18 | [
[
"Menéndez",
"J.",
""
]
] | The detection of neutrinoless double-beta decay will establish the Majorana nature of neutrinos. In addition, if the nuclear matrix elements of this process are reliably known, the experimental lifetime will provide precious information about the absolute neutrino masses and hierarchy. I review the status of nuclear structure calculations for neutrinoless double-beta decay matrix elements, and discuss some key issues to be addressed in order to meet the demand for accurate nuclear matrix elements. |
1405.1729 | Ian Shoemaker | Chris Kouvaris and Ian M. Shoemaker | Daily Modulation as a Smoking Gun of Dark Matter with Significant
Stopping | 11 pages, 3 figures; v3 minor corrections | Phys. Rev. D 90, 095011 (2014) | 10.1103/PhysRevD.90.095011 | CP3-Origins-2014-019 DNRF90,DIAS-2014-19 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We point out that for a range of parameters, the flux of DM may be stopped
significantly by its interactions with the Earth. This can significantly
degrade the sensitivity of direct detection experiments to DM candidates with
large interactions with terrestrial nuclei. We find that a significant region
of parameter space remains unconstrained for DM $\lesssim $ a few GeV. For DM
candidates with moderate levels of stopping power, the flux of DM may be
blocked from below but not above a detector thereby producing a novel daily
modulation. This can be explored by low threshold detectors placed on the
surface or in shallow sites in the south hemisphere.
| [
{
"created": "Wed, 7 May 2014 20:00:16 GMT",
"version": "v1"
},
{
"created": "Mon, 16 Jun 2014 20:28:33 GMT",
"version": "v2"
},
{
"created": "Wed, 1 Apr 2015 13:46:46 GMT",
"version": "v3"
}
] | 2015-04-02 | [
[
"Kouvaris",
"Chris",
""
],
[
"Shoemaker",
"Ian M.",
""
]
] | We point out that for a range of parameters, the flux of DM may be stopped significantly by its interactions with the Earth. This can significantly degrade the sensitivity of direct detection experiments to DM candidates with large interactions with terrestrial nuclei. We find that a significant region of parameter space remains unconstrained for DM $\lesssim $ a few GeV. For DM candidates with moderate levels of stopping power, the flux of DM may be blocked from below but not above a detector thereby producing a novel daily modulation. This can be explored by low threshold detectors placed on the surface or in shallow sites in the south hemisphere. |
1512.08461 | Wei-jie Fu | Wei-jie Fu and Jan M. Pawlowski | Correlating the skewness and kurtosis of baryon number distributions | 7 pages, 3 figures, 1 table; updated to match version published in
Phy. Rev. D | Phys. Rev. D 93, 091501 (2016) | 10.1103/PhysRevD.93.091501 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The skewness and the kurtosis of the baryon number distributions are computed
within QCD-improved low energy effective models including quantum thermal and
density fluctuations. The results are compared with the Beam Energy Scan
experiment at RHIC. The theoretical results agree with the experimental
measurements up to errors, for the collision energy $\sqrt{s}\ge
19.6\,\mathrm{GeV}$. For smaller collision energies a discrepancy between
theoretical and experimental results develops. This discrepancy partially
relates to the lack of precision of the current setup for small collision
energies. It is outlined how this deficiency can be overcome.
| [
{
"created": "Mon, 28 Dec 2015 17:12:32 GMT",
"version": "v1"
},
{
"created": "Fri, 5 Feb 2016 00:37:52 GMT",
"version": "v2"
},
{
"created": "Thu, 26 May 2016 15:55:23 GMT",
"version": "v3"
}
] | 2016-06-01 | [
[
"Fu",
"Wei-jie",
""
],
[
"Pawlowski",
"Jan M.",
""
]
] | The skewness and the kurtosis of the baryon number distributions are computed within QCD-improved low energy effective models including quantum thermal and density fluctuations. The results are compared with the Beam Energy Scan experiment at RHIC. The theoretical results agree with the experimental measurements up to errors, for the collision energy $\sqrt{s}\ge 19.6\,\mathrm{GeV}$. For smaller collision energies a discrepancy between theoretical and experimental results develops. This discrepancy partially relates to the lack of precision of the current setup for small collision energies. It is outlined how this deficiency can be overcome. |
0811.4077 | Jan Steinheimer | Jan Steinheimer, Michael Mitrovski, Tim Schuster, Hannah Petersen,
Marcus Bleicher and Horst Stoecker | Strangeness fluctuations and MEMO production at FAIR | 7 pages, 8 figures, added some discussion, changed plots | Phys.Lett.B676:126-131,2009 | 10.1016/j.physletb.2009.04.062 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We apply a coupled transport-hydrodynamics model to discuss the production of
multi-strange meta-stable objects in Pb+Pb reactions at the FAIR facility. In
addition to making predictions for yields of these particles we are able to
calculate particle dependent rapidity and momentum distributions. We argue that
the FAIR energy regime is the optimal place to search for multi-strange
baryonic object (due to the high baryon density, favouring a distillation of
strangeness). Additionally, we show results for strangeness and baryon density
fluctuations. Using the UrQMD model we calculate the strangeness seperation in
phase space which might lead to an enhanced production of MEMOs compared to
models that assume global thermalization.
| [
{
"created": "Tue, 25 Nov 2008 20:16:41 GMT",
"version": "v1"
},
{
"created": "Mon, 3 Aug 2009 08:19:27 GMT",
"version": "v2"
}
] | 2009-11-05 | [
[
"Steinheimer",
"Jan",
""
],
[
"Mitrovski",
"Michael",
""
],
[
"Schuster",
"Tim",
""
],
[
"Petersen",
"Hannah",
""
],
[
"Bleicher",
"Marcus",
""
],
[
"Stoecker",
"Horst",
""
]
] | We apply a coupled transport-hydrodynamics model to discuss the production of multi-strange meta-stable objects in Pb+Pb reactions at the FAIR facility. In addition to making predictions for yields of these particles we are able to calculate particle dependent rapidity and momentum distributions. We argue that the FAIR energy regime is the optimal place to search for multi-strange baryonic object (due to the high baryon density, favouring a distillation of strangeness). Additionally, we show results for strangeness and baryon density fluctuations. Using the UrQMD model we calculate the strangeness seperation in phase space which might lead to an enhanced production of MEMOs compared to models that assume global thermalization. |
1906.10961 | Ulf-G. Mei{\ss}ner | Y. \"Unal, Ulf-G. Mei{\ss}ner | A note on scalar meson dominance | 9 pages, 3 figures, extended introduction and discussions,
conclusions unchanged, version accepted for publication in Chinese Physics C | Chinese Physics C 43 (2019) 103105 | 10.1088/1674-1137/43/10/103105 | null | hep-ph nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We consider chiral perturbation theory with an explicit broad $\sigma$-meson
and study its contribution to the scalar form factors of the pion and the
nucleon. Our goal is to learn more about resonance saturation in the scalar
sector.
| [
{
"created": "Wed, 26 Jun 2019 10:39:02 GMT",
"version": "v1"
},
{
"created": "Fri, 16 Aug 2019 06:07:29 GMT",
"version": "v2"
}
] | 2019-10-30 | [
[
"Ünal",
"Y.",
""
],
[
"Meißner",
"Ulf-G.",
""
]
] | We consider chiral perturbation theory with an explicit broad $\sigma$-meson and study its contribution to the scalar form factors of the pion and the nucleon. Our goal is to learn more about resonance saturation in the scalar sector. |
1905.11409 | Tom\'a\v{s} Brauner | Tom\'a\v{s} Brauner and Georgios Filios and Helena Kole\v{s}ov\'a | Chiral soliton lattice in QCD-like theories | 1+26 pages; v2 matches published version | JHEP12(2019)029 | 10.1007/JHEP12(2019)029 | null | hep-ph hep-lat hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Recently, it has been shown that the ground state of quantum chromodynamics
(QCD) in sufficiently strong magnetic fields and at moderate baryon number
chemical potential carries a crystalline condensate of neutral pions: the
chiral soliton lattice (CSL). While the result was obtained in a
model-independent manner using effective field theory techniques, its
realization from first principles using lattice Monte Carlo simulation is
hampered by the infamous sign problem. Here we show that CSL, or a similar
inhomogeneous phase, also appears in the phase diagram of a class of
vector-like gauge theories that do not suffer from the sign problem even in the
presence of a baryon chemical potential and external magnetic field. We also
show that the onset of nonuniform order manifests itself already in the
adjacent homogeneous Bose-Einstein-condensation phase through a characteristic
roton-like minimum in the dispersion relation of the lowest-lying quasiparticle
mode. Last but not least, our work gives a class of explicit counterexamples to
the long-standing conjecture that positivity of the determinant of the Dirac
operator (that is, absence of the sign problem) in a vector-like gauge theory
precludes spontaneous breaking of translational invariance, and thus implies
the absence of inhomogeneous phases in the phase diagram of the theory.
| [
{
"created": "Mon, 27 May 2019 18:00:02 GMT",
"version": "v1"
},
{
"created": "Wed, 4 Dec 2019 14:22:46 GMT",
"version": "v2"
}
] | 2019-12-05 | [
[
"Brauner",
"Tomáš",
""
],
[
"Filios",
"Georgios",
""
],
[
"Kolešová",
"Helena",
""
]
] | Recently, it has been shown that the ground state of quantum chromodynamics (QCD) in sufficiently strong magnetic fields and at moderate baryon number chemical potential carries a crystalline condensate of neutral pions: the chiral soliton lattice (CSL). While the result was obtained in a model-independent manner using effective field theory techniques, its realization from first principles using lattice Monte Carlo simulation is hampered by the infamous sign problem. Here we show that CSL, or a similar inhomogeneous phase, also appears in the phase diagram of a class of vector-like gauge theories that do not suffer from the sign problem even in the presence of a baryon chemical potential and external magnetic field. We also show that the onset of nonuniform order manifests itself already in the adjacent homogeneous Bose-Einstein-condensation phase through a characteristic roton-like minimum in the dispersion relation of the lowest-lying quasiparticle mode. Last but not least, our work gives a class of explicit counterexamples to the long-standing conjecture that positivity of the determinant of the Dirac operator (that is, absence of the sign problem) in a vector-like gauge theory precludes spontaneous breaking of translational invariance, and thus implies the absence of inhomogeneous phases in the phase diagram of the theory. |
2107.12725 | Francesco Giovanni Celiberto | Andr\`ee Dafne Bolognino, Francesco Giovanni Celiberto, Dmitry Yu.
Ivanov, Alessandro Papa | Exclusive emissions of rho-mesons and the unintegrated gluon
distribution | 8 pages, 1 figure, contribution to the proceedings of the XXVIII
International Workshop on Deep Inelastic Scattering and Related Subjects
(DIS2021), Stony Brook, New York, USA, 12-16 April, 2021, version accepted
for publication on SciPost Physics Proceedings | SciPost Phys. Proc. 8, 089 (2022) | 10.21468/SciPostPhysProc.8 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Exclusive emissions of vector mesons in forward directions of rapidity offer
us a faultless chance to probe the proton structure at small-$x$. A high-energy
factorization formula is established within BFKL, given as the convolution of
an impact factor depicting the forward-meson emission and of an unintegrated
gluon distribution (UGD) driving the gluon evolution at small-$x$. As a
nonperturbative quantity, the UGD is not well known and several models for it
exist. We present recent progresses on the study of the exclusive forward
$\rho$-meson leptoproduction at HERA and EIC energies, showing how osbervables
sensitive to different polarization states of the $\rho$-particle act as
discriminators for the existing UGD models.
| [
{
"created": "Tue, 27 Jul 2021 10:56:39 GMT",
"version": "v1"
},
{
"created": "Wed, 16 Mar 2022 15:41:07 GMT",
"version": "v2"
},
{
"created": "Thu, 17 Mar 2022 15:22:21 GMT",
"version": "v3"
},
{
"created": "Tue, 2 Aug 2022 00:03:01 GMT",
"version": "v4"
}
] | 2022-08-03 | [
[
"Bolognino",
"Andrèe Dafne",
""
],
[
"Celiberto",
"Francesco Giovanni",
""
],
[
"Ivanov",
"Dmitry Yu.",
""
],
[
"Papa",
"Alessandro",
""
]
] | Exclusive emissions of vector mesons in forward directions of rapidity offer us a faultless chance to probe the proton structure at small-$x$. A high-energy factorization formula is established within BFKL, given as the convolution of an impact factor depicting the forward-meson emission and of an unintegrated gluon distribution (UGD) driving the gluon evolution at small-$x$. As a nonperturbative quantity, the UGD is not well known and several models for it exist. We present recent progresses on the study of the exclusive forward $\rho$-meson leptoproduction at HERA and EIC energies, showing how osbervables sensitive to different polarization states of the $\rho$-particle act as discriminators for the existing UGD models. |
2405.09467 | Jing Song | Victor Montesinos, Jing Song, Wei-Hong Liang, Eulogio Oset, Juan
Nieves, Miguel Albaladejo | Study of possible $DND^*$ bound states | 9 pages, 4 figures | null | null | null | hep-ph nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We start from a recently favored picture in which the $\Lambda_c(2940)$ and
$\Lambda_c(2910)$ correspond mostly to $ND^*$ bound states with $J^P = 1/2^-,\,
3/2^-$ and then add a $D$ as a third particle, looking for the possible binding
of the $DND^*$ three body system within the framework of the Fixed Center
Approximation. We find that the system is bound with respect to the
corresponding $\Lambda_c^* D$ threshold with a binding of about $60$ MeV and a
width of about $90$ MeV. Alternatively we assume a cluster of $ND$ and a $D^*$
meson interacting with the cluster and we find similar results. The observation
of these states of $J^P = 1/2^+,\, 3/2^+$ would provide new and valuable
information concerning the $DN$ and $D^* N$ interaction, an issue of current
debate.
| [
{
"created": "Wed, 15 May 2024 16:01:24 GMT",
"version": "v1"
},
{
"created": "Wed, 22 May 2024 09:27:16 GMT",
"version": "v2"
}
] | 2024-05-24 | [
[
"Montesinos",
"Victor",
""
],
[
"Song",
"Jing",
""
],
[
"Liang",
"Wei-Hong",
""
],
[
"Oset",
"Eulogio",
""
],
[
"Nieves",
"Juan",
""
],
[
"Albaladejo",
"Miguel",
""
]
] | We start from a recently favored picture in which the $\Lambda_c(2940)$ and $\Lambda_c(2910)$ correspond mostly to $ND^*$ bound states with $J^P = 1/2^-,\, 3/2^-$ and then add a $D$ as a third particle, looking for the possible binding of the $DND^*$ three body system within the framework of the Fixed Center Approximation. We find that the system is bound with respect to the corresponding $\Lambda_c^* D$ threshold with a binding of about $60$ MeV and a width of about $90$ MeV. Alternatively we assume a cluster of $ND$ and a $D^*$ meson interacting with the cluster and we find similar results. The observation of these states of $J^P = 1/2^+,\, 3/2^+$ would provide new and valuable information concerning the $DN$ and $D^* N$ interaction, an issue of current debate. |
2108.05337 | Luca Buonocore | Luca Buonocore, Gabri\"el Koole, Daniele Lombardi, Luca Rottoli,
Marius Wiesemann and Giulia Zanderighi | $ZZ$ production at nNNLO+PS with MiNNLO$_{\text{PS}}$ | 32 pages, 7 figures, 2 tables | null | 10.1007/JHEP01(2022)072 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We consider $ZZ$ production in hadronic collisions and present
state-of-the-art predictions in QCD perturbation theory matched to parton
showers. Next-to-next-to-leading order corrections to the quark-initiated
channel are combined with parton showers using the MiNNLO$_{\text{PS}}$ method,
while next-to-leading order corrections to the loop-induced gluon fusion
channel are matched using the POWHEG method. Their combination, dubbed
nNNLO+PS, constitutes the best theoretical description of $ZZ$ events to date.
Spin correlations, interferences and off-shell effects are included by
calculating the full process $pp \to
\ell^+\ell^-\ell^{(\prime)+}\ell^{(\prime)-}$. We show the crucial impact of
higher-order corrections for both quark- and gluon-initiated processes as well
as the relevance of the parton shower in certain kinematical regimes. Our
predictions are in very good agreement with recent LHC data.
| [
{
"created": "Wed, 11 Aug 2021 17:26:01 GMT",
"version": "v1"
}
] | 2022-02-02 | [
[
"Buonocore",
"Luca",
""
],
[
"Koole",
"Gabriël",
""
],
[
"Lombardi",
"Daniele",
""
],
[
"Rottoli",
"Luca",
""
],
[
"Wiesemann",
"Marius",
""
],
[
"Zanderighi",
"Giulia",
""
]
] | We consider $ZZ$ production in hadronic collisions and present state-of-the-art predictions in QCD perturbation theory matched to parton showers. Next-to-next-to-leading order corrections to the quark-initiated channel are combined with parton showers using the MiNNLO$_{\text{PS}}$ method, while next-to-leading order corrections to the loop-induced gluon fusion channel are matched using the POWHEG method. Their combination, dubbed nNNLO+PS, constitutes the best theoretical description of $ZZ$ events to date. Spin correlations, interferences and off-shell effects are included by calculating the full process $pp \to \ell^+\ell^-\ell^{(\prime)+}\ell^{(\prime)-}$. We show the crucial impact of higher-order corrections for both quark- and gluon-initiated processes as well as the relevance of the parton shower in certain kinematical regimes. Our predictions are in very good agreement with recent LHC data. |
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