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|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
1209.2421 | Matthew Schwartz | David Krohn, Tongyan Lin, Matthew D. Schwartz, Wouter J. Waalewijn | Jet Charge at the LHC | 5 pages, 6 figures; v2 published version | Phys. Rev. Lett. 110 (2013) 212001 | 10.1103/PhysRevLett.110.212001 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Knowing the charge of the parton initiating a light-quark jet could be
extremely useful both for testing aspects of the Standard Model and for
characterizing potential beyond-the-Standard-Model signals. We show that
despite the complications of hadronization and out-of-jet radiation such as
pile-up, a weighted sum of the charges of a jet's constituents can be used at
the LHC to distinguish among jets with different charges. Potential
applications include measuring electroweak quantum numbers of hadronically
decaying resonances or supersymmetric particles, as well as Standard Model
tests, such as jet charge in dijet events or in hadronically-decaying W bosons
in t-tbar events. We develop a systematically improvable method to calculate
moments of these charge distributions by combining multi-hadron fragmentation
functions with perturbative jet functions and pertubative evolution equations.
We show that the dependence on energy and jet size for the average and width of
the jet charge can be calculated despite the large experimental uncertainty on
fragmentation functions. These calculations can provide a validation tool for
data independent of Monte-Carlo fragmentation models.
| [
{
"created": "Tue, 11 Sep 2012 20:00:15 GMT",
"version": "v1"
},
{
"created": "Fri, 14 Jun 2013 18:14:18 GMT",
"version": "v2"
}
] | 2013-06-17 | [
[
"Krohn",
"David",
""
],
[
"Lin",
"Tongyan",
""
],
[
"Schwartz",
"Matthew D.",
""
],
[
"Waalewijn",
"Wouter J.",
""
]
] | Knowing the charge of the parton initiating a light-quark jet could be extremely useful both for testing aspects of the Standard Model and for characterizing potential beyond-the-Standard-Model signals. We show that despite the complications of hadronization and out-of-jet radiation such as pile-up, a weighted sum of the charges of a jet's constituents can be used at the LHC to distinguish among jets with different charges. Potential applications include measuring electroweak quantum numbers of hadronically decaying resonances or supersymmetric particles, as well as Standard Model tests, such as jet charge in dijet events or in hadronically-decaying W bosons in t-tbar events. We develop a systematically improvable method to calculate moments of these charge distributions by combining multi-hadron fragmentation functions with perturbative jet functions and pertubative evolution equations. We show that the dependence on energy and jet size for the average and width of the jet charge can be calculated despite the large experimental uncertainty on fragmentation functions. These calculations can provide a validation tool for data independent of Monte-Carlo fragmentation models. |
hep-ph/9607258 | David Richards | D.S. Henty, C. Parrinello, D.G. Richards, J.I. Skullerud (UKQCD
Collaboration) | Lattice Study of the Pomeron | 2 pages, LateX, uses sprocl.sty and psfig.sty, to be published in
Proceedings of Fourteenth Particles and Nuclei International Conference
(PANIC 96), Williamsburg, VA, May 1996 | null | null | Edinburgh Preprint 96/12, Liverpool Preprint LTH-377 | hep-ph hep-lat | null | We investigate the phenomenology of the Landshoff-Nachtmann
two-gluon-exchange model of the Pomeron using gluon propagators computed in the
Landau gauge within quenched lattice QCD simulations. As the propagators have
been evaluated entirely from QCD first principles, our results provide a
consistency check of the model. Finally, we report a proposal to investigate
the structure of the Pomeron-quark vertex, using a colour-singlet Pomeron
source constructed from the gauge fields.
| [
{
"created": "Mon, 8 Jul 1996 15:01:48 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Henty",
"D. S.",
"",
"UKQCD\n Collaboration"
],
[
"Parrinello",
"C.",
"",
"UKQCD\n Collaboration"
],
[
"Richards",
"D. G.",
"",
"UKQCD\n Collaboration"
],
[
"Skullerud",
"J. I.",
"",
"UKQCD\n Collaboration"
]
] | We investigate the phenomenology of the Landshoff-Nachtmann two-gluon-exchange model of the Pomeron using gluon propagators computed in the Landau gauge within quenched lattice QCD simulations. As the propagators have been evaluated entirely from QCD first principles, our results provide a consistency check of the model. Finally, we report a proposal to investigate the structure of the Pomeron-quark vertex, using a colour-singlet Pomeron source constructed from the gauge fields. |
2211.13596 | Lorenzo Tancredi | Thomas Gehrmann, Tiziano Peraro, Lorenzo Tancredi | Two-loop QCD corrections to the $V\to q\bar{q}g$ helicity amplitudes
with axial-vector couplings | version 3: added missing term in the renormalization of the
pure-singlet axial contribution, eq (4.13) and updated ancillary files | null | 10.1007/JHEP02(2023)041 | TUM-HEP-1439/22, ZU-TH 49/22 | hep-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We compute the two-loop corrections to the helicity amplitudes for the
coupling of a massive vector boson to a massless quark-antiquark pair and a
gluon, accounting for vector and axial-vector couplings of the vector boson and
distinguishing isospin non-singlet and singlet contributions. A new
four-dimensional basis for the decomposition of the amplitudes into 12
invariant tensor structures is introduced. The associated form factors are then
computed up to two loops in QCD using dimensional regularization. After
performing renormalization and infrared subtraction, the finite parts of the
renormalized non-singlet vector and axial-vector form factors are shown agree
with each other, and to reproduce the previously known two-loop amplitudes. The
singlet axial-vector amplitude receives a contribution from the axial anomaly
from two loops onwards. This amplitude is computed for massless and massive
internal quarks. Our results provide the last missing two-loop amplitudes
entering the NNLO QCD corrections of vector-boson-plus-jet production at hadron
colliders.
| [
{
"created": "Thu, 24 Nov 2022 13:33:02 GMT",
"version": "v1"
},
{
"created": "Fri, 16 Dec 2022 13:57:32 GMT",
"version": "v2"
},
{
"created": "Fri, 16 Jun 2023 10:24:53 GMT",
"version": "v3"
}
] | 2023-06-19 | [
[
"Gehrmann",
"Thomas",
""
],
[
"Peraro",
"Tiziano",
""
],
[
"Tancredi",
"Lorenzo",
""
]
] | We compute the two-loop corrections to the helicity amplitudes for the coupling of a massive vector boson to a massless quark-antiquark pair and a gluon, accounting for vector and axial-vector couplings of the vector boson and distinguishing isospin non-singlet and singlet contributions. A new four-dimensional basis for the decomposition of the amplitudes into 12 invariant tensor structures is introduced. The associated form factors are then computed up to two loops in QCD using dimensional regularization. After performing renormalization and infrared subtraction, the finite parts of the renormalized non-singlet vector and axial-vector form factors are shown agree with each other, and to reproduce the previously known two-loop amplitudes. The singlet axial-vector amplitude receives a contribution from the axial anomaly from two loops onwards. This amplitude is computed for massless and massive internal quarks. Our results provide the last missing two-loop amplitudes entering the NNLO QCD corrections of vector-boson-plus-jet production at hadron colliders. |
hep-ph/0703033 | Sergey Kulagin | S. A. Kulagin and R. Petti | Neutrino inclusive inelastic scattering off nuclei | 40 pages, 14 figures; final version to appear in Phys. Rev. D | Phys.Rev.D76:094023,2007 | 10.1103/PhysRevD.76.094023 | null | hep-ph hep-ex nucl-ex nucl-th | null | We present a detailed description of high-energy neutrino and antineutrino
inelastic inclusive scattering off nuclei in terms of nuclear structure
functions. In our approach we take into account a QCD description of the
nucleon structure functions as well as a number of basic nuclear effects
including nuclear shadowing, Fermi motion and binding, nuclear pion excess and
off-shell correction to bound nucleon structure functions. These effects prove
to be important in the studies of charged-lepton deep-inelastic scattering. We
discuss similarities and dissimilarities in the calculation of nuclear effects
for charged-lepton and neutrino scattering caused by nonconserved axial current
in neutrino scattering. We examine the Adler and the Gross-Llewellyn-Smith sum
rules for nuclear structure functions and find a remarkable cancellation
between nuclear shadowing and off-shell corrections in these sum rules. We
present calculations of differential cross sections for inclusive neutrino and
antineutrino scattering in comparison with recent data on different target
materials.
| [
{
"created": "Sat, 3 Mar 2007 13:09:19 GMT",
"version": "v1"
},
{
"created": "Sat, 27 Oct 2007 12:32:02 GMT",
"version": "v2"
}
] | 2008-11-26 | [
[
"Kulagin",
"S. A.",
""
],
[
"Petti",
"R.",
""
]
] | We present a detailed description of high-energy neutrino and antineutrino inelastic inclusive scattering off nuclei in terms of nuclear structure functions. In our approach we take into account a QCD description of the nucleon structure functions as well as a number of basic nuclear effects including nuclear shadowing, Fermi motion and binding, nuclear pion excess and off-shell correction to bound nucleon structure functions. These effects prove to be important in the studies of charged-lepton deep-inelastic scattering. We discuss similarities and dissimilarities in the calculation of nuclear effects for charged-lepton and neutrino scattering caused by nonconserved axial current in neutrino scattering. We examine the Adler and the Gross-Llewellyn-Smith sum rules for nuclear structure functions and find a remarkable cancellation between nuclear shadowing and off-shell corrections in these sum rules. We present calculations of differential cross sections for inclusive neutrino and antineutrino scattering in comparison with recent data on different target materials. |
2312.00447 | Florian Lindenbauer | Kirill Boguslavski, Aleksi Kurkela, Tuomas Lappi, Florian Lindenbauer,
Jarkko Peuron | Jet quenching parameter in QCD kinetic theory | 34 pages, 10 figures, accepted for publication in PRD | null | null | null | hep-ph nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the jet quenching parameter $\hat q$ in a non-equilibrium plasma
using the QCD effective kinetic theory. We discuss subleading terms at large
jet momentum p, show that our expression for $\hat q$ reproduces thermal
results at small and large transverse momentum cutoffs for infinite p and
construct an interpolation between these limits to be used in phenomenological
applications. Using simple non-equilibrium distributions that model pertinent
features of the bottom-up thermalization scenario, we analytically assess how
anisotropy, under- or overoccupation affect the jet quenching parameter. Our
work provides more details on the $\hat q$ formula used in our preceding work
[arXiv:2303.12595] and sets the stage for further numerical studies of jet
momentum broadening in the initial stages of heavy-ion collisions from QCD
kinetic theory.
| [
{
"created": "Fri, 1 Dec 2023 09:28:23 GMT",
"version": "v1"
},
{
"created": "Tue, 16 Jul 2024 09:36:19 GMT",
"version": "v2"
}
] | 2024-07-17 | [
[
"Boguslavski",
"Kirill",
""
],
[
"Kurkela",
"Aleksi",
""
],
[
"Lappi",
"Tuomas",
""
],
[
"Lindenbauer",
"Florian",
""
],
[
"Peuron",
"Jarkko",
""
]
] | We study the jet quenching parameter $\hat q$ in a non-equilibrium plasma using the QCD effective kinetic theory. We discuss subleading terms at large jet momentum p, show that our expression for $\hat q$ reproduces thermal results at small and large transverse momentum cutoffs for infinite p and construct an interpolation between these limits to be used in phenomenological applications. Using simple non-equilibrium distributions that model pertinent features of the bottom-up thermalization scenario, we analytically assess how anisotropy, under- or overoccupation affect the jet quenching parameter. Our work provides more details on the $\hat q$ formula used in our preceding work [arXiv:2303.12595] and sets the stage for further numerical studies of jet momentum broadening in the initial stages of heavy-ion collisions from QCD kinetic theory. |
hep-ph/0507240 | Nikodem Poplawski | Nikodem J. Poplawski | A Relativistic Description of Hadronic Decays of the Exotic Meson
$\pi_{1}$ | 131 pages, 42 figures. Ph.D. thesis, Indiana University 2004 | null | null | null | hep-ph | null | Exotic mesons are striking predictions of quantum chromodynamics that go
beyond the quark model. They can provide great insight into understanding
phenomena such as asymptotic freedom, confinement, and dynamical symmetry
breaking. This work analyzes hadronic decays of exotic mesons, with a focus on
the lightest one, the $J^{PC}=1^{-+}$ $\pi_{1}$, in a fully relativistic
formalism. The relativistic spin wave functions of normal and exotic mesons are
constructed based on unitary representations of the Poincare group. The radial
wave functions are obtained from phenomenological considerations of the mass
operator. We find that fully relativistic results using Wigner rotations differ
significantly from nonrelativistic ones. Moreover, the S+P selection rule is
also satisfied in relativistic formalism. Final state interactions do not
change these results much.
| [
{
"created": "Wed, 20 Jul 2005 06:13:45 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Poplawski",
"Nikodem J.",
""
]
] | Exotic mesons are striking predictions of quantum chromodynamics that go beyond the quark model. They can provide great insight into understanding phenomena such as asymptotic freedom, confinement, and dynamical symmetry breaking. This work analyzes hadronic decays of exotic mesons, with a focus on the lightest one, the $J^{PC}=1^{-+}$ $\pi_{1}$, in a fully relativistic formalism. The relativistic spin wave functions of normal and exotic mesons are constructed based on unitary representations of the Poincare group. The radial wave functions are obtained from phenomenological considerations of the mass operator. We find that fully relativistic results using Wigner rotations differ significantly from nonrelativistic ones. Moreover, the S+P selection rule is also satisfied in relativistic formalism. Final state interactions do not change these results much. |
hep-ph/9505389 | null | P.Kalyniak, P.Madsen, N.Sinha, R.Sinha | Probing Anomalous Triple Boson Vertices at Future $e^+e^-$ Colliders | 26 pages,Latex,4 tar-uuencoded figures | Phys.Rev. D52 (1995) 3826-3835 | 10.1103/PhysRevD.52.3826 | OCIP/C-95-9 | hep-ph | null | We explore the detection potential of the four lepton production processes
$e^{+}e^{-} \rightarrow l^{+} \nu l^{\prime -}\overline{\nu}$ for anomalous
contributions to the triple boson vertices at proposed future high energy
colliders with center-of-mass energies of 500 GeV and 1 TeV. The predicted
bounds are of the order of a few percent for the $CP$-even couplings
$\kappa_{V}$ (V=$\gamma$,Z) at the higher energy; we show that these limits can
be improved by as much as a factor of two through suitable phase space cuts. A
polarized beam facility, with its ability to access helicity information, could
provide constraints on the vertices significantly tighter than those achievable
from an analysis of total cross-section alone. The asymmetries in experimental
observables produced by an explicitly $CP$ violating triple vertex contribution
are seen to be below the expected level of statistical precision of
approximately $1.5 \%$; asymmetries in the individual contributing helicity
amplitudes might however be detectable.
| [
{
"created": "Fri, 26 May 1995 14:07:06 GMT",
"version": "v1"
}
] | 2009-10-28 | [
[
"Kalyniak",
"P.",
""
],
[
"Madsen",
"P.",
""
],
[
"Sinha",
"N.",
""
],
[
"Sinha",
"R.",
""
]
] | We explore the detection potential of the four lepton production processes $e^{+}e^{-} \rightarrow l^{+} \nu l^{\prime -}\overline{\nu}$ for anomalous contributions to the triple boson vertices at proposed future high energy colliders with center-of-mass energies of 500 GeV and 1 TeV. The predicted bounds are of the order of a few percent for the $CP$-even couplings $\kappa_{V}$ (V=$\gamma$,Z) at the higher energy; we show that these limits can be improved by as much as a factor of two through suitable phase space cuts. A polarized beam facility, with its ability to access helicity information, could provide constraints on the vertices significantly tighter than those achievable from an analysis of total cross-section alone. The asymmetries in experimental observables produced by an explicitly $CP$ violating triple vertex contribution are seen to be below the expected level of statistical precision of approximately $1.5 \%$; asymmetries in the individual contributing helicity amplitudes might however be detectable. |
1704.02135 | Vitaly Okorokov A | V. A. Okorokov (National Research Nuclear University MEPhI), S. D.
Campos (Universidade Federal de S\~ao Carlos) | Analysis of $pp$ and $\bar{p}p$ Elastic Scattering Based on Theoretical
Bounds in High-Energy Physics: an Update | 10 pages, 2 figures and 3 tables | Int. J. Mod. Phys. A32, 1750175 (2017) | 10.1142/S0217751X17501755 | null | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In a previous work a novel parametrization was proposed for the $pp$ and
$\bar{p}p$ total cross section. Here, results are presented for analysis
updated with taken into account the recent data from accelerator experiments as
well as from cosmic ray measurements. The analytic parameterizations suggested
within axiomatic quantum field theory (AQFT) provide the quantitative
description of energy dependence of global scattering observables with robust
values of fit parameters. Based on the fit results the estimations are derived
for the total cross section and the $\rho$ parameter in elastic $pp$ scattering
at various $\sqrt{s}$ up to energy frontier $\sqrt{s}=10$ PeV which can be
useful for present and future hadron colliders as well as for cosmic ray
measurements at ultra-high energies.
| [
{
"created": "Fri, 7 Apr 2017 08:48:08 GMT",
"version": "v1"
},
{
"created": "Sun, 15 Oct 2017 10:29:19 GMT",
"version": "v2"
}
] | 2017-10-17 | [
[
"Okorokov",
"V. A.",
"",
"National Research Nuclear University MEPhI"
],
[
"Campos",
"S. D.",
"",
"Universidade Federal de São Carlos"
]
] | In a previous work a novel parametrization was proposed for the $pp$ and $\bar{p}p$ total cross section. Here, results are presented for analysis updated with taken into account the recent data from accelerator experiments as well as from cosmic ray measurements. The analytic parameterizations suggested within axiomatic quantum field theory (AQFT) provide the quantitative description of energy dependence of global scattering observables with robust values of fit parameters. Based on the fit results the estimations are derived for the total cross section and the $\rho$ parameter in elastic $pp$ scattering at various $\sqrt{s}$ up to energy frontier $\sqrt{s}=10$ PeV which can be useful for present and future hadron colliders as well as for cosmic ray measurements at ultra-high energies. |
hep-ph/0506206 | Zhenyu Han | Zhenyu Han, Witold Skiba | Little Higgs Models and Electroweak Measurements | Small changes to the plots due to the change in numerical results in
hep-ph/0412166, text unchanged | Phys.Rev. D72 (2005) 035005 | 10.1103/PhysRevD.72.035005 | null | hep-ph | null | Using effective field theory approach, we study the constraints from
electroweak data on the SU(5)/SO(5), SU(6)/SP(6), SU(3)xU(1) little Higgs
models and their variations. We construct an effective theory valid above the
electroweak symmetry breaking scale in these models that includes dimension-six
operators induced by integrating out heavy fields. We calculate the constraints
on the models using the results of hep-ph/0412166, where bounds on arbitrary
linear combinations of flavor and CP conserving dimension-six operators are
given. We present the constraints in terms of the bounds on the masses of heavy
fermions and heavy gauge bosons. The constraints are often stringent, but in
some regions of the parameter space the constraints are mild enough and do not
imply significant fine-tuning.
| [
{
"created": "Tue, 21 Jun 2005 22:17:41 GMT",
"version": "v1"
},
{
"created": "Wed, 6 Jul 2005 00:14:22 GMT",
"version": "v2"
},
{
"created": "Fri, 5 Aug 2005 19:01:06 GMT",
"version": "v3"
}
] | 2009-11-11 | [
[
"Han",
"Zhenyu",
""
],
[
"Skiba",
"Witold",
""
]
] | Using effective field theory approach, we study the constraints from electroweak data on the SU(5)/SO(5), SU(6)/SP(6), SU(3)xU(1) little Higgs models and their variations. We construct an effective theory valid above the electroweak symmetry breaking scale in these models that includes dimension-six operators induced by integrating out heavy fields. We calculate the constraints on the models using the results of hep-ph/0412166, where bounds on arbitrary linear combinations of flavor and CP conserving dimension-six operators are given. We present the constraints in terms of the bounds on the masses of heavy fermions and heavy gauge bosons. The constraints are often stringent, but in some regions of the parameter space the constraints are mild enough and do not imply significant fine-tuning. |
hep-ph/9806427 | Sarira Sahu | Sarira Sahu and Vishnu M. Bannur | Effect of random magnetic field on active-sterile neutrino conversion in
the supernova core | 11 pages, revtex, one figure | Phys.Rev.D61:023003,2000 | 10.1103/PhysRevD.61.023003 | null | hep-ph | null | The active-sterile neutrino conversion is studied for neutrino propagating in
the axial potential generated by magnetised electron plasma in the supernova
medium. We consider the effect of random magnetic field $B_{rms}$ on the
average neutrino conversion probability. We obtained the constraint on $\Delta
m^2$ and $\sin^2 2\theta$ for different strength of the random magnetic fields,
by considering the positive definiteness of the average neutrino conversion
probability inside the supernova core. Our calculation shows that, $B_{rms}\le
0.63\times 10^{14}$ Gauss is preferable so that small values of $\Delta m^2$
can not be excluded.
| [
{
"created": "Sat, 20 Jun 1998 09:02:52 GMT",
"version": "v1"
}
] | 2009-12-30 | [
[
"Sahu",
"Sarira",
""
],
[
"Bannur",
"Vishnu M.",
""
]
] | The active-sterile neutrino conversion is studied for neutrino propagating in the axial potential generated by magnetised electron plasma in the supernova medium. We consider the effect of random magnetic field $B_{rms}$ on the average neutrino conversion probability. We obtained the constraint on $\Delta m^2$ and $\sin^2 2\theta$ for different strength of the random magnetic fields, by considering the positive definiteness of the average neutrino conversion probability inside the supernova core. Our calculation shows that, $B_{rms}\le 0.63\times 10^{14}$ Gauss is preferable so that small values of $\Delta m^2$ can not be excluded. |
hep-ph/0511256 | Roman Nevzorov | S.F. King, S. Moretti, R. Nevzorov | Exceptional Supersymmetric Standard Model | 12 pages, 3 figures, some minor changes to the text | Phys.Lett. B634 (2006) 278-284 | 10.1016/j.physletb.2005.12.070 | SHEP-05-35 | hep-ph | null | We discuss some phenomenological aspects of an $E_6$ inspired supersymmetric
standard model with an extra $U(1)_{N}$ gauge symmetry under which right-handed
neutrinos have zero charge, allowing a conventional see-saw mechanism. The
$\mu$ problem is solved in a similar way to the NMSSM, but without the
accompanying problems of singlet tadpoles or domain walls. The above
exceptional supersymmetric standard model (ESSM) involves the low energy matter
content of three 27 representations of $E_6$, which is broken at the GUT scale,
and allows gauge coupling unification due to an additional pair of Higgs-like
doublets. The ESSM predicts a $Z'$ boson and exotic quarks which, if light
enough, will provide spectacular new physics signals at the LHC. We study the
LHC phenomenology of the $Z'$ and extra quarks, including their production and
decay signatures particular to the ESSM. We also discuss the two-loop upper
bound on the mass of the lightest CP-even Higgs boson, and show that it can be
significantly heavier than in either the MSSM or the NMSSM.
| [
{
"created": "Tue, 22 Nov 2005 15:46:02 GMT",
"version": "v1"
},
{
"created": "Mon, 5 Dec 2005 17:01:20 GMT",
"version": "v2"
}
] | 2009-11-11 | [
[
"King",
"S. F.",
""
],
[
"Moretti",
"S.",
""
],
[
"Nevzorov",
"R.",
""
]
] | We discuss some phenomenological aspects of an $E_6$ inspired supersymmetric standard model with an extra $U(1)_{N}$ gauge symmetry under which right-handed neutrinos have zero charge, allowing a conventional see-saw mechanism. The $\mu$ problem is solved in a similar way to the NMSSM, but without the accompanying problems of singlet tadpoles or domain walls. The above exceptional supersymmetric standard model (ESSM) involves the low energy matter content of three 27 representations of $E_6$, which is broken at the GUT scale, and allows gauge coupling unification due to an additional pair of Higgs-like doublets. The ESSM predicts a $Z'$ boson and exotic quarks which, if light enough, will provide spectacular new physics signals at the LHC. We study the LHC phenomenology of the $Z'$ and extra quarks, including their production and decay signatures particular to the ESSM. We also discuss the two-loop upper bound on the mass of the lightest CP-even Higgs boson, and show that it can be significantly heavier than in either the MSSM or the NMSSM. |
2106.03433 | Xinyi Zhang | Xinyi Zhang, Shun Zhou | Inverse Seesaw Model with a Modular $S^{}_4$ Symmetry: Lepton Flavor
Mixing and Warm Dark Matter | 27 pages, 4 figures, match the published version | JCAP 09 (2021) 043 | 10.1088/1475-7516/2021/09/043 | null | hep-ph astro-ph.CO | http://creativecommons.org/licenses/by-nc-nd/4.0/ | In this paper, we present a systematic investigation on simple inverse seesaw
models for neutrino masses and flavor mixing based on the modular $S^{}_4$
symmetry. Two right-handed neutrinos and three extra fermion singlets are
introduced to account for light neutrino masses through the inverse seesaw
mechanism, and to provide a keV-mass sterile neutrino as the candidate for warm
dark matter in our Universe. Considering all possible modular forms with
weights no larger than four, we obtain twelve models, among which we find one
is in excellent agreement with the observed lepton mass spectra and flavor
mixing. Moreover, we explore the allowed range of the sterile neutrino mass and
mixing angles, by taking into account the direct search of $X$-ray line and the
Lyman-$\alpha$ observations. The model predictions for neutrino mixing
parameters and the dark matter abundance will be readily testable in future
neutrino oscillation experiments and cosmological observations.
| [
{
"created": "Mon, 7 Jun 2021 09:06:23 GMT",
"version": "v1"
},
{
"created": "Thu, 30 Sep 2021 07:28:56 GMT",
"version": "v2"
}
] | 2021-10-01 | [
[
"Zhang",
"Xinyi",
""
],
[
"Zhou",
"Shun",
""
]
] | In this paper, we present a systematic investigation on simple inverse seesaw models for neutrino masses and flavor mixing based on the modular $S^{}_4$ symmetry. Two right-handed neutrinos and three extra fermion singlets are introduced to account for light neutrino masses through the inverse seesaw mechanism, and to provide a keV-mass sterile neutrino as the candidate for warm dark matter in our Universe. Considering all possible modular forms with weights no larger than four, we obtain twelve models, among which we find one is in excellent agreement with the observed lepton mass spectra and flavor mixing. Moreover, we explore the allowed range of the sterile neutrino mass and mixing angles, by taking into account the direct search of $X$-ray line and the Lyman-$\alpha$ observations. The model predictions for neutrino mixing parameters and the dark matter abundance will be readily testable in future neutrino oscillation experiments and cosmological observations. |
0910.1588 | Henrik Melbeus | Mattias Blennow, Henrik Melbeus, Tommy Ohlsson | Neutrinos from Kaluza-Klein dark matter in the Sun | 31 pages, 3 figures, REVTeX4. Final version published in J. Cosmol.
Astropart. Phys | JCAP01 1001:018,2010 | 10.1088/1475-7516/2010/01/018 | MPP-2009-170 | hep-ph astro-ph.HE | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We investigate indirect neutrino signals from annihilations of Kaluza-Klein
dark matter in the Sun. Especially, we examine a five- as well as a
six-dimensional model, and allow for the possibility that boundary localized
terms could affect the spectrum to give different lightest Kaluza-Klein
particles, which could constitute the dark matter. The dark matter candidates
that are interesting for the purpose of indirect detection of neutrinos are the
first Kaluza-Klein mode of the U(1) gauge boson and the neutral component of
the SU(2) gauge bosons. Using the DarkSUSY and WimpSim packages, we calculate
muon fluxes at an Earth-based neutrino telescope, such as IceCube. For the
five-dimensional model, the results that we obtained agree reasonably well with
the results that have previously been presented in the literature, whereas for
the six-dimensional model, we find that, at tree-level, the results are the
same as for the five-dimensional model. Finally, if the first Kaluza-Klein mode
of the U(1) gauge boson constitutes the dark matter, IceCube can constrain the
parameter space. However, in the case that the neutral component of the SU(2)
gauge bosons is the LKP, the signal is too weak to be observed.
| [
{
"created": "Thu, 8 Oct 2009 20:00:03 GMT",
"version": "v1"
},
{
"created": "Tue, 26 Jan 2010 06:48:32 GMT",
"version": "v2"
}
] | 2015-05-14 | [
[
"Blennow",
"Mattias",
""
],
[
"Melbeus",
"Henrik",
""
],
[
"Ohlsson",
"Tommy",
""
]
] | We investigate indirect neutrino signals from annihilations of Kaluza-Klein dark matter in the Sun. Especially, we examine a five- as well as a six-dimensional model, and allow for the possibility that boundary localized terms could affect the spectrum to give different lightest Kaluza-Klein particles, which could constitute the dark matter. The dark matter candidates that are interesting for the purpose of indirect detection of neutrinos are the first Kaluza-Klein mode of the U(1) gauge boson and the neutral component of the SU(2) gauge bosons. Using the DarkSUSY and WimpSim packages, we calculate muon fluxes at an Earth-based neutrino telescope, such as IceCube. For the five-dimensional model, the results that we obtained agree reasonably well with the results that have previously been presented in the literature, whereas for the six-dimensional model, we find that, at tree-level, the results are the same as for the five-dimensional model. Finally, if the first Kaluza-Klein mode of the U(1) gauge boson constitutes the dark matter, IceCube can constrain the parameter space. However, in the case that the neutral component of the SU(2) gauge bosons is the LKP, the signal is too weak to be observed. |
2003.01014 | Bernd Kniehl | Mathias Butenschoen, Bernd A. Kniehl | Dipole Subtraction vs. Phase Space Slicing in NLO NRQCD Heavy-Quarkonium
Production Calculations | 24 pages, 1 figure, 6 tables, matches journal version | Nucl. Phys. B 957 (2020) 115056 | 10.1016/j.nuclphysb.2020.115056 | DESY 20-032 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We compare two approaches to evaluate cross sections of heavy-quarkonium
production at next-to-leading order in nonrelativistic QCD involving $S$- and
$P$-wave Fock states: the customary approach based on phase space slicing and
the approach based on dipole subtraction recently elaborated by us. We find
reasonable agreement between the numerical results of the two implementations,
but the dipole subtraction implementation outperforms the phase space slicing
one both with regard to accuracy and speed.
| [
{
"created": "Mon, 2 Mar 2020 16:41:21 GMT",
"version": "v1"
},
{
"created": "Fri, 27 Jan 2023 09:53:43 GMT",
"version": "v2"
}
] | 2023-01-30 | [
[
"Butenschoen",
"Mathias",
""
],
[
"Kniehl",
"Bernd A.",
""
]
] | We compare two approaches to evaluate cross sections of heavy-quarkonium production at next-to-leading order in nonrelativistic QCD involving $S$- and $P$-wave Fock states: the customary approach based on phase space slicing and the approach based on dipole subtraction recently elaborated by us. We find reasonable agreement between the numerical results of the two implementations, but the dipole subtraction implementation outperforms the phase space slicing one both with regard to accuracy and speed. |
1609.08055 | Francesco Giacosa | Francesco Giacosa | Modelling glueballs | Proceedings of MESON2016, 14th International Workshop on Meson
Production, Properties and Interaction KRAK\'OW, POLAND, 2-7/6/2016. 6 pages | null | 10.1051/epjconf/201613001009 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Glueballs are predicted in various theoretical approaches of QCD (most
notably lattice QCD), but their experimental verification is still missing. In
the low-energy sector some promising candidate for the scalar glueball exist,
and some (less clear) candidates for the tensor and pseudoscalar glueballs were
also proposed. Yet, for heavier gluonic states there is much work to be done
both from the experimental and theoretical points of view. In these
proceedings, we briefly review the current status of research of glueballs and
discuss future developments.
| [
{
"created": "Mon, 26 Sep 2016 16:36:43 GMT",
"version": "v1"
}
] | 2016-12-21 | [
[
"Giacosa",
"Francesco",
""
]
] | Glueballs are predicted in various theoretical approaches of QCD (most notably lattice QCD), but their experimental verification is still missing. In the low-energy sector some promising candidate for the scalar glueball exist, and some (less clear) candidates for the tensor and pseudoscalar glueballs were also proposed. Yet, for heavier gluonic states there is much work to be done both from the experimental and theoretical points of view. In these proceedings, we briefly review the current status of research of glueballs and discuss future developments. |
hep-ph/9804300 | Debajyoti Choudhury | Debajyoti Choudhury and John Ellis | Estimates of Long-distance Contributions to the $B_s \to \gamma \gamma$
Decay | 9 pages, 2 figures (embedded), all style files included | Phys.Lett.B433:102-108,1998 | 10.1016/S0370-2693(98)00679-0 | CERN-TH/98-76, MRI-PHY/P980443 | hep-ph | null | We present first calculations of new long-distance contributions to $B_s \to
\gamma \gamma$ decay due to intermediate $D_s$ and $D_s^*$ meson states. The
relevant $\gamma$ vertices are estimated using charge couplings and transition
moment couplings. Within our uncertainties, we find that these long-distance
contributions could be comparable to the known short-distance contributions.
Since they have different Cabibbo-Kobayashi-Maskawa matrix-element factors,
there may be an interesting possibility of observing CP violation in this
decay.
| [
{
"created": "Wed, 15 Apr 1998 19:40:29 GMT",
"version": "v1"
}
] | 2009-09-11 | [
[
"Choudhury",
"Debajyoti",
""
],
[
"Ellis",
"John",
""
]
] | We present first calculations of new long-distance contributions to $B_s \to \gamma \gamma$ decay due to intermediate $D_s$ and $D_s^*$ meson states. The relevant $\gamma$ vertices are estimated using charge couplings and transition moment couplings. Within our uncertainties, we find that these long-distance contributions could be comparable to the known short-distance contributions. Since they have different Cabibbo-Kobayashi-Maskawa matrix-element factors, there may be an interesting possibility of observing CP violation in this decay. |
0711.2231 | Vitaly Okorokov A | V.A. Okorokov (1), S.B. Nurushev (2) ((1) Moscow Engineering Physics
Institute (State University), (2) Institute for High Energy Physics,
Protvino) | Elastic proton-proton and proton-antiproton scattering: analysis of
complete set of helicity amplitudes | 4 pages, XII Workshop on high energy spin physics, DSPIN-2007,
September 3-7, 2007, Dubna, Russia | null | null | null | hep-ph | null | The differential cross-sections are calculated for proton-proton and
proton-antiproton elastic scattering using the phenomenological model based on
the analytic parameterizations for global scattering parameters (total
cross-section and $\rho$ - parameter), crossing symmetry and derivative
relations. We confront our model predictions with experimental data in wide
range of energy and momentum transfer. The suggested method may be useful for
PAX Program (GSI) as well as for high-energy experiments at RHIC and LHC.
| [
{
"created": "Wed, 14 Nov 2007 15:50:10 GMT",
"version": "v1"
}
] | 2007-11-15 | [
[
"Okorokov",
"V. A.",
""
],
[
"Nurushev",
"S. B.",
""
]
] | The differential cross-sections are calculated for proton-proton and proton-antiproton elastic scattering using the phenomenological model based on the analytic parameterizations for global scattering parameters (total cross-section and $\rho$ - parameter), crossing symmetry and derivative relations. We confront our model predictions with experimental data in wide range of energy and momentum transfer. The suggested method may be useful for PAX Program (GSI) as well as for high-energy experiments at RHIC and LHC. |
2203.12012 | Dmitry Karlovets | D. V. Karlovets, S. S. Baturin, G. Geloni, G. K. Sizykh, and V. G.
Serbo | Shifting physics of vortex particles to higher energies via quantum
entanglement | null | Eur. Phys. J. C 83, 372 (2023) | 10.1140/epjc/s10052-023-11529-4 | null | hep-ph physics.acc-ph physics.optics quant-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Physics of structured waves is currently limited to relatively small particle
energies as the available generation techniques are only applicable to the soft
$X$-ray twisted photons, to the beams of electron microscopes, to cold
neutrons, or non-relativistic atoms. The highly energetic vortex particles with
an orbital angular momentum would come in handy for a number of experiments in
atomic physics, nuclear, hadronic, and accelerator physics, and to generate
them one needs to develop alternative methods, applicable for ultrarelativistic
energies and for composite particles. Here, we show that the vortex states of
in principle arbitrary particles can be generated during photon emission in
helical undulators, via Cherenkov radiation, in collisions of charged particles
with intense laser beams, in such scattering or annihilation processes as $e\mu
\to e\mu, ep \to ep, e^-e^+ \to p\bar{p}$, and so forth. The key element in
obtaining them is the postselection protocol due to entanglement between a pair
of final particles and it is largely not the process itself. The state of a
final particle -- be it a $\gamma$-ray, a hadron, a nucleus, or an ion --
becomes twisted if the azimuthal angle of the other particle momentum is
measured with a large error or is not measured at all. As a result,
requirements to the beam transverse coherence can be greatly relaxed, which
enables the generation of highly energetic vortex beams at accelerators and
synchrotron radiation facilities, thus making them a new tool for hadronic and
spin studies.
| [
{
"created": "Tue, 22 Mar 2022 19:37:13 GMT",
"version": "v1"
},
{
"created": "Tue, 30 Aug 2022 13:23:08 GMT",
"version": "v2"
},
{
"created": "Fri, 3 Mar 2023 15:12:22 GMT",
"version": "v3"
},
{
"created": "Sat, 6 May 2023 16:35:37 GMT",
"version": "v4"
}
] | 2023-05-09 | [
[
"Karlovets",
"D. V.",
""
],
[
"Baturin",
"S. S.",
""
],
[
"Geloni",
"G.",
""
],
[
"Sizykh",
"G. K.",
""
],
[
"Serbo",
"V. G.",
""
]
] | Physics of structured waves is currently limited to relatively small particle energies as the available generation techniques are only applicable to the soft $X$-ray twisted photons, to the beams of electron microscopes, to cold neutrons, or non-relativistic atoms. The highly energetic vortex particles with an orbital angular momentum would come in handy for a number of experiments in atomic physics, nuclear, hadronic, and accelerator physics, and to generate them one needs to develop alternative methods, applicable for ultrarelativistic energies and for composite particles. Here, we show that the vortex states of in principle arbitrary particles can be generated during photon emission in helical undulators, via Cherenkov radiation, in collisions of charged particles with intense laser beams, in such scattering or annihilation processes as $e\mu \to e\mu, ep \to ep, e^-e^+ \to p\bar{p}$, and so forth. The key element in obtaining them is the postselection protocol due to entanglement between a pair of final particles and it is largely not the process itself. The state of a final particle -- be it a $\gamma$-ray, a hadron, a nucleus, or an ion -- becomes twisted if the azimuthal angle of the other particle momentum is measured with a large error or is not measured at all. As a result, requirements to the beam transverse coherence can be greatly relaxed, which enables the generation of highly energetic vortex beams at accelerators and synchrotron radiation facilities, thus making them a new tool for hadronic and spin studies. |
1401.6057 | Costas Papadopoulos | Costas G. Papadopoulos | Simplified differential equations approach for Master Integrals | 20 pages, 6 figures, ancillary files with results. References and
acknowledgments added | null | 10.1007/JHEP07(2014)088 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A simplified differential equations approach for Master Integrals is
presented. It allows to express them, straightforwardly, in terms of Goncharov
Polylogarithms. As a proof-of-concept of the proposed method, results at one
and two loops are presented, including the massless one-loop pentagon with up
to one off-shell leg at order epsilon.
| [
{
"created": "Thu, 23 Jan 2014 17:11:48 GMT",
"version": "v1"
},
{
"created": "Sun, 9 Feb 2014 09:30:38 GMT",
"version": "v2"
},
{
"created": "Thu, 14 Sep 2017 05:51:47 GMT",
"version": "v3"
}
] | 2017-09-15 | [
[
"Papadopoulos",
"Costas G.",
""
]
] | A simplified differential equations approach for Master Integrals is presented. It allows to express them, straightforwardly, in terms of Goncharov Polylogarithms. As a proof-of-concept of the proposed method, results at one and two loops are presented, including the massless one-loop pentagon with up to one off-shell leg at order epsilon. |
2109.01625 | Patricia Magalhaes | Ignacio Bediaga, Tobias Frederico, Patricia C. Magalhaes and Diego
Torres Machado | Global CP asymmetries in charmless three-body $B$ decays with final
state interactions | Revised version with important clarification and new references | Physics Letters B, Volume 824 (2022)136824 | 10.1016/j.physletb.2021.136824 | null | hep-ph hep-ex | http://creativecommons.org/licenses/by/4.0/ | We propose a theoretical framework to understand the observable charge-parity
(CP) violation in charmless three-body $B^\pm$ decays. The decay amplitudes put
together the $\pi\pi \to KK $ re-scattering and the U-spin symmetry, treated
within a CPT invariant framework. This approach applied to a two-channel model
provides the magnitudes and signs of the ratios of the global CP asymmetries
for $B^\pm \to K^\pm \pi^+ \pi^- \,$, $B^\pm \to K^\pm K^+ K^- \,$, $B^\pm \to
\pi^\pm K^+ K^- \,$ and $B^\pm \to \pi^\pm \pi^+\pi^- \,$ decays, compatible
with those obtained from the available experimental data. In addition, by
considering the neutral channels we predict the ratios for the global CP
asymmetries for these decays.
| [
{
"created": "Fri, 3 Sep 2021 17:08:37 GMT",
"version": "v1"
},
{
"created": "Mon, 10 Jan 2022 18:47:48 GMT",
"version": "v2"
}
] | 2022-01-11 | [
[
"Bediaga",
"Ignacio",
""
],
[
"Frederico",
"Tobias",
""
],
[
"Magalhaes",
"Patricia C.",
""
],
[
"Machado",
"Diego Torres",
""
]
] | We propose a theoretical framework to understand the observable charge-parity (CP) violation in charmless three-body $B^\pm$ decays. The decay amplitudes put together the $\pi\pi \to KK $ re-scattering and the U-spin symmetry, treated within a CPT invariant framework. This approach applied to a two-channel model provides the magnitudes and signs of the ratios of the global CP asymmetries for $B^\pm \to K^\pm \pi^+ \pi^- \,$, $B^\pm \to K^\pm K^+ K^- \,$, $B^\pm \to \pi^\pm K^+ K^- \,$ and $B^\pm \to \pi^\pm \pi^+\pi^- \,$ decays, compatible with those obtained from the available experimental data. In addition, by considering the neutral channels we predict the ratios for the global CP asymmetries for these decays. |
1309.3118 | Norihisa Watanabe | Norihisa Watanabe, Toshiaki Kaneko | One loop integration with hypergeometric series by using recursion
relations | null | null | 10.1088/1742-6596/523/1/012063 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | General one-loop integrals with arbitrary mass and kinematical parameters in
$d$-dimensional space-time are studied. By using Bernstein theorem, a recursion
relation is obtained which connects $(n+1)$-point to $n$-point functions. In
solving this recursion relation, we have shown that one-loop integrals are
expressed by a newly defined hypergeometric function, which is a special case
of Aomoto-Gelfand hypergeometric functions.
We have also obtained coefficients of power series expansion around
4-dimensional space-time for two-, three- and four-point functions. The
numerical results are compared with LoopTools for the case of two- and
three-point functions as examples.
| [
{
"created": "Thu, 12 Sep 2013 11:30:29 GMT",
"version": "v1"
}
] | 2015-06-17 | [
[
"Watanabe",
"Norihisa",
""
],
[
"Kaneko",
"Toshiaki",
""
]
] | General one-loop integrals with arbitrary mass and kinematical parameters in $d$-dimensional space-time are studied. By using Bernstein theorem, a recursion relation is obtained which connects $(n+1)$-point to $n$-point functions. In solving this recursion relation, we have shown that one-loop integrals are expressed by a newly defined hypergeometric function, which is a special case of Aomoto-Gelfand hypergeometric functions. We have also obtained coefficients of power series expansion around 4-dimensional space-time for two-, three- and four-point functions. The numerical results are compared with LoopTools for the case of two- and three-point functions as examples. |
hep-ph/9712240 | Sharon Jensen | J. D. Bjorken (SLAC) | Multiparticle Dynamics 1997: Concluding Talk | LaTex, 11 pages | Nucl.Phys.Proc.Suppl. 71 (1999) 484-494 | 10.1016/S0920-5632(98)00381-8 | SLAC-PUB-7708 | hep-ph | null | This contribution to the XXVII Symposium on Multiparticle Dynamics held in
Frascati, Italy, September, 1997 consists of the following subject matter: (1)
Introductory generalities. (2) Brief mention of some of the contributions to
the meeting. (3) More extended discussion of a few specialized topics. (4)
Discussion of the FELIX initiative for a QCD detector at the LHC.
| [
{
"created": "Tue, 2 Dec 1997 23:42:16 GMT",
"version": "v1"
}
] | 2009-10-30 | [
[
"Bjorken",
"J. D.",
"",
"SLAC"
]
] | This contribution to the XXVII Symposium on Multiparticle Dynamics held in Frascati, Italy, September, 1997 consists of the following subject matter: (1) Introductory generalities. (2) Brief mention of some of the contributions to the meeting. (3) More extended discussion of a few specialized topics. (4) Discussion of the FELIX initiative for a QCD detector at the LHC. |
1401.0039 | D\'aniel Ber\'enyi | D\'aniel Ber\'enyi, S\'andor Varr\'o, Vladimir V. Skokov, P\'eter
L\'evai | Pair production at the edge of the QED flux tube | 6 pages, 6 figures | null | null | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We investigate the process of Abelian pair production in the presence of
strong inhomogeneous and time-dependent external electric fields. The spatial
dependence of the external field is motivated by a non-Abelian color flux tube
in heavy-ion collisions. We show that the inhomogeneity significantly increase
the particle yield compared to that in the commonly used models with a constant
and homogeneous field. Moreover our results indicate that in contrast to the
latter, most of the particles are produced at the interface of the field
profile in accordance with Heisenberg's prediction.
| [
{
"created": "Mon, 30 Dec 2013 22:19:59 GMT",
"version": "v1"
}
] | 2014-01-03 | [
[
"Berényi",
"Dániel",
""
],
[
"Varró",
"Sándor",
""
],
[
"Skokov",
"Vladimir V.",
""
],
[
"Lévai",
"Péter",
""
]
] | We investigate the process of Abelian pair production in the presence of strong inhomogeneous and time-dependent external electric fields. The spatial dependence of the external field is motivated by a non-Abelian color flux tube in heavy-ion collisions. We show that the inhomogeneity significantly increase the particle yield compared to that in the commonly used models with a constant and homogeneous field. Moreover our results indicate that in contrast to the latter, most of the particles are produced at the interface of the field profile in accordance with Heisenberg's prediction. |
hep-ph/9909265 | Yoshitaka Kuno | Yoshitaka Kuno and Yasuhiro Okada (KEK) | Muon Decay and Physics Beyond the Standard Model | 109 pages, 37 postscript figures, uses REVTEX.sty | Rev.Mod.Phys.73:151-202,2001 | 10.1103/RevModPhys.73.151 | KEK Preprint 99-69, KEK-TH-639 | hep-ph hep-ex | null | This article reviews the current theoretical and experimental status of the
field of muon decay and its potential to search for new physics beyond the
Standard Model. The importance of rare muon processes with lepton flavor
violation is highly stressed, together with precision measurements of normal
muon decay. Recent up-to-date motivations of lepton flavor violation based on
supersymmetric models, in particular supersymmetric grand unified theories, are
described along with other theoretical models. Future prospects of experiments
and muon sources of high intensity for further progress in this field are also
discussed.
| [
{
"created": "Mon, 6 Sep 1999 16:38:57 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Kuno",
"Yoshitaka",
"",
"KEK"
],
[
"Okada",
"Yasuhiro",
"",
"KEK"
]
] | This article reviews the current theoretical and experimental status of the field of muon decay and its potential to search for new physics beyond the Standard Model. The importance of rare muon processes with lepton flavor violation is highly stressed, together with precision measurements of normal muon decay. Recent up-to-date motivations of lepton flavor violation based on supersymmetric models, in particular supersymmetric grand unified theories, are described along with other theoretical models. Future prospects of experiments and muon sources of high intensity for further progress in this field are also discussed. |
2401.03373 | Ning Yu | Hongge Xu, Ning Yu, Zuman Zhang, Guoying Chen | The general propagator for S-wave threshold states | 10pages, more discussions added | null | null | null | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We demonstrate that the propagator, derived from an Effective Field Theory
(EFT) that incorporates Weinberger's compositeness theorem, provides a more
general formula for describing S-wave near-threshold states. By fitting the
lineshape using this propagator, we can extract the $Z$ factor for these states
and elucidate their structures.
| [
{
"created": "Sun, 7 Jan 2024 02:44:04 GMT",
"version": "v1"
},
{
"created": "Sun, 21 Jan 2024 07:34:58 GMT",
"version": "v2"
},
{
"created": "Sat, 18 May 2024 13:51:44 GMT",
"version": "v3"
},
{
"created": "Mon, 22 Jul 2024 03:46:46 GMT",
"version": "v4"
}
] | 2024-07-23 | [
[
"Xu",
"Hongge",
""
],
[
"Yu",
"Ning",
""
],
[
"Zhang",
"Zuman",
""
],
[
"Chen",
"Guoying",
""
]
] | We demonstrate that the propagator, derived from an Effective Field Theory (EFT) that incorporates Weinberger's compositeness theorem, provides a more general formula for describing S-wave near-threshold states. By fitting the lineshape using this propagator, we can extract the $Z$ factor for these states and elucidate their structures. |
hep-ph/9602225 | null | A.D. Jackson, M.K. \c{S}ener, J.J.M. Verbaarschot | Universality near zero virtuality | 23 pages, Latex | Nucl.Phys. B479 (1996) 707-726 | 10.1016/0550-3213(96)00397-5 | SUNY-NTG-96/1 | hep-ph cond-mat | null | In this paper we study a random matrix model with the chiral and flavor
structure of the QCD Dirac operator and a temperature dependence given by the
lowest Matsubara frequency. Using the supersymmetric method for random matrix
theory, we obtain an exact, analytic expression for the average spectral
density. In the large-n limit, the spectral density can be obtained from the
solution to a cubic equation. This spectral density is non-zero in the vicinity
of eigenvalue zero only for temperatures below the critical temperature of this
model. Our main result is the demonstration that the microscopic limit of the
spectral density is independent of temperature up to the critical temperature.
This is due to a number of `miraculous' cancellations. This result provides
strong support for the conjecture that the microscopic spectral density is
universal. In our derivation, we emphasize the symmetries of the partition
function and show that this universal behavior is closely related to the
existence of an invariant saddle-point manifold.
| [
{
"created": "Mon, 5 Feb 1996 23:24:57 GMT",
"version": "v1"
}
] | 2009-10-28 | [
[
"Jackson",
"A. D.",
""
],
[
"Şener",
"M. K.",
""
],
[
"Verbaarschot",
"J. J. M.",
""
]
] | In this paper we study a random matrix model with the chiral and flavor structure of the QCD Dirac operator and a temperature dependence given by the lowest Matsubara frequency. Using the supersymmetric method for random matrix theory, we obtain an exact, analytic expression for the average spectral density. In the large-n limit, the spectral density can be obtained from the solution to a cubic equation. This spectral density is non-zero in the vicinity of eigenvalue zero only for temperatures below the critical temperature of this model. Our main result is the demonstration that the microscopic limit of the spectral density is independent of temperature up to the critical temperature. This is due to a number of `miraculous' cancellations. This result provides strong support for the conjecture that the microscopic spectral density is universal. In our derivation, we emphasize the symmetries of the partition function and show that this universal behavior is closely related to the existence of an invariant saddle-point manifold. |
hep-ph/0006158 | Victor Petrov | V.N.Gribov | Space-time description of the hadron interaction at high energies | Lecture given at the VIII Winter Petersburg NPI School in the
beginning of 1973. Translated from Russian by J.Nyiri, M.Strikman and
V.Petrov. 26 pages, 26 EPS figures | null | null | null | hep-ph | null | This is a classical paper by Vladimir Gribov (1930-97) which has influenced
the understanding of high energy hadron collisions and deep inelastic
scattering for several decades, and is still important today. Gribov's main
assumption - that partons have limited transverse momenta - was later proved to
be satisfied in QCD, modulo logarithmic corrections. However, QCD was just
coming into existence at the time of the lecture, and Gribov used the
super-renormalizable \phi^3 theory to illustrate his points.
| [
{
"created": "Wed, 14 Jun 2000 18:04:23 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Gribov",
"V. N.",
""
]
] | This is a classical paper by Vladimir Gribov (1930-97) which has influenced the understanding of high energy hadron collisions and deep inelastic scattering for several decades, and is still important today. Gribov's main assumption - that partons have limited transverse momenta - was later proved to be satisfied in QCD, modulo logarithmic corrections. However, QCD was just coming into existence at the time of the lecture, and Gribov used the super-renormalizable \phi^3 theory to illustrate his points. |
2301.06592 | Abolfazl Dinmohammadi | Abolfazl Dinmohammadi, Matti Heikinheimo, Nader Mirabolfathi, Kai
Nordlund, Hossein Safari, Sebastian Sassi and Kimmo Tuominen | Daily and annual modulation rate of low mass dark matter in silicon
detectors | 6 pages, 7 figures | null | null | null | hep-ph | http://creativecommons.org/licenses/by-nc-sa/4.0/ | Low threshold detectors with single-electron excitation sensitivity to
nuclear recoil events in solid-state detectors are also sensitive to the
crystalline structure of the target and, therefore, to the recoil direction via
the anisotropic energy threshold for defect creation in the detector material.
We investigate this effect and the resulting daily and annual modulation of the
observable event rate for dark matter mass range from 0.2 to 5 GeV/c$^{2}$ in a
silicon detector. We show that the directional dependence of the threshold
energy and the motion of the laboratory result in modulation of the event rate
which can be utilized to enhance the sensitivity of the experiment. We
demonstrate that the spin-independent interaction rate in silicon is
significant for both high and low dark matter masses. For low-mass dark matter,
we show that the average interaction rate in silicon is larger than germanium,
making silicon an important target for identifying dark matter from
backgrounds. We find 8 and 12 hours periodicity in the time series of event
rates for silicon detector due to the 45-degree symmetry in the silicon crystal
structure.
| [
{
"created": "Mon, 16 Jan 2023 20:18:18 GMT",
"version": "v1"
}
] | 2023-01-18 | [
[
"Dinmohammadi",
"Abolfazl",
""
],
[
"Heikinheimo",
"Matti",
""
],
[
"Mirabolfathi",
"Nader",
""
],
[
"Nordlund",
"Kai",
""
],
[
"Safari",
"Hossein",
""
],
[
"Sassi",
"Sebastian",
""
],
[
"Tuominen",
"Kimmo",
""
]
] | Low threshold detectors with single-electron excitation sensitivity to nuclear recoil events in solid-state detectors are also sensitive to the crystalline structure of the target and, therefore, to the recoil direction via the anisotropic energy threshold for defect creation in the detector material. We investigate this effect and the resulting daily and annual modulation of the observable event rate for dark matter mass range from 0.2 to 5 GeV/c$^{2}$ in a silicon detector. We show that the directional dependence of the threshold energy and the motion of the laboratory result in modulation of the event rate which can be utilized to enhance the sensitivity of the experiment. We demonstrate that the spin-independent interaction rate in silicon is significant for both high and low dark matter masses. For low-mass dark matter, we show that the average interaction rate in silicon is larger than germanium, making silicon an important target for identifying dark matter from backgrounds. We find 8 and 12 hours periodicity in the time series of event rates for silicon detector due to the 45-degree symmetry in the silicon crystal structure. |
hep-ph/0107010 | Roberto Fiore | V.S. Fadin, R. Fiore | Calculation of Reggeon Vertices in QCD | 27 pages, LaTex, 1 figure, uses axodraw.sty | Phys.Rev. D64 (2001) 114012 | 10.1103/PhysRevD.64.114012 | BUDKERIMP /01-32, DFCAL-TH 01/3 | hep-ph | null | The method of calculation of effective vertices of interaction of the
Reggeized gluon and quark with particles in QCD in the next-to-leading order is
developed. The method is demonstrated in the case of already known vertices of
both gluon-gluon and quark-quark transitions in the scattering of gluons and
quarks on the Reggeized gluon. It is used for the calculation of the
gluon-quark transition in the scattering on the Reggeized quark.
| [
{
"created": "Mon, 2 Jul 2001 14:31:50 GMT",
"version": "v1"
}
] | 2009-11-07 | [
[
"Fadin",
"V. S.",
""
],
[
"Fiore",
"R.",
""
]
] | The method of calculation of effective vertices of interaction of the Reggeized gluon and quark with particles in QCD in the next-to-leading order is developed. The method is demonstrated in the case of already known vertices of both gluon-gluon and quark-quark transitions in the scattering of gluons and quarks on the Reggeized gluon. It is used for the calculation of the gluon-quark transition in the scattering on the Reggeized quark. |
0909.3254 | Christopher Wells | Raman Sundrum and Christopher M. Wells | Warped Hybrid Inflation | 35 pages, 8 figures, 3 tables; Corrected typos, added more discussion
of reheating the standard model; Version in JHEP | JHEP 1002:097,2010 | 10.1007/JHEP02(2010)097 | null | hep-ph astro-ph.CO gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We construct a model of hybrid inflation within a controlled five-dimensional
effective field theory framework. The inflaton and waterfall fields are
realized as naturally light moduli of the 5D compactification. At the quantum
level, waterfall loops must be cut off at a scale considerably lower than the
inflaton field transit in order to preserve slow-roll dynamics without
fine-tuning. We accomplish this by a significant warping, or redshift, between
the extra-dimensional regions in which the inflaton and waterfall fields are
localized. The mechanisms we employ have been separately realized in string
theory, which suggests that a string UV completion of our model is possible. We
study a part of the parameter space in which the cosmology takes a standard
form, but we point out that it is also possible for some regions of space to
end inflation by quantum tunneling. Such regions may provide new cosmological
signals, which we will study in future work.
| [
{
"created": "Thu, 17 Sep 2009 15:37:28 GMT",
"version": "v1"
},
{
"created": "Wed, 4 Nov 2009 20:47:16 GMT",
"version": "v2"
},
{
"created": "Mon, 14 Jun 2010 18:58:31 GMT",
"version": "v3"
}
] | 2014-11-20 | [
[
"Sundrum",
"Raman",
""
],
[
"Wells",
"Christopher M.",
""
]
] | We construct a model of hybrid inflation within a controlled five-dimensional effective field theory framework. The inflaton and waterfall fields are realized as naturally light moduli of the 5D compactification. At the quantum level, waterfall loops must be cut off at a scale considerably lower than the inflaton field transit in order to preserve slow-roll dynamics without fine-tuning. We accomplish this by a significant warping, or redshift, between the extra-dimensional regions in which the inflaton and waterfall fields are localized. The mechanisms we employ have been separately realized in string theory, which suggests that a string UV completion of our model is possible. We study a part of the parameter space in which the cosmology takes a standard form, but we point out that it is also possible for some regions of space to end inflation by quantum tunneling. Such regions may provide new cosmological signals, which we will study in future work. |
hep-ph/0205215 | Jiri Hosek | Jiri Hosek | Anisotropic QCD superfluids | Presented at NATO Advanced Research Workshop on Confinement, Topology
and other Nonperturbative Aspects of QCD, Stara Lesna, Slovakia, 21-27
January, 2002; 8 pages | null | 10.1142/9789812702883_0021 | null | hep-ph | null | We discuss two instances of anisotropic ordered quantum phases within QCD at
finite baryon densities: (1) Fermionic deconfined three-color QCD matter with a
spin one quark-quark Cooper pair condensate can exhibit distinct quantum i.e.
low-temperature ($T$) behaviors on macroscopic scales which bona fide can be
observed in neutron stars. (2) Bosonic confined two-color QCD matter with a
Bose-Einstein condensate of spin-one baryons can exhibit distinct quantum i.e.
low-$T$ behaviors on macroscopic scales which can bona fide be observed in
numerical lattice experiments.
| [
{
"created": "Mon, 20 May 2002 13:29:09 GMT",
"version": "v1"
}
] | 2017-08-23 | [
[
"Hosek",
"Jiri",
""
]
] | We discuss two instances of anisotropic ordered quantum phases within QCD at finite baryon densities: (1) Fermionic deconfined three-color QCD matter with a spin one quark-quark Cooper pair condensate can exhibit distinct quantum i.e. low-temperature ($T$) behaviors on macroscopic scales which bona fide can be observed in neutron stars. (2) Bosonic confined two-color QCD matter with a Bose-Einstein condensate of spin-one baryons can exhibit distinct quantum i.e. low-$T$ behaviors on macroscopic scales which can bona fide be observed in numerical lattice experiments. |
hep-ph/0201156 | Fornengo Nicolao | Nicolao Fornengo (U. of Torino and INFN, Torino) | Candidates for non-baryonic dark matter | 13 pages, 10 figures, typeset with ReVTeX, uses espcrc2.sty. Invited
review talk presented at "Topics in Astroparticle and Underground Physics
(TAUP 2001)" Laboratori Nazionali del Gran Sasso, Italy, September 8-12,
2001. References added. The paper may also be downloaded from
http://www.to.infn.it/~fornengo/proceedings/taup01.ps.gz | Nucl.Phys.Proc.Suppl. 110 (2002) 26-38 | 10.1016/S0920-5632(02)01447-0 | null | hep-ph astro-ph hep-ex | null | This report is a brief review of the efforts to explain the nature of
non-baryonic dark matter and of the studies devoted to the search for relic
particles. Among the different dark matter candidates, special attention is
devoted to relic neutralinos, by giving an overview of the recent calculations
of its relic abundance and detection rates in a wide variety of supersymmetric
schemes.
| [
{
"created": "Thu, 17 Jan 2002 14:47:12 GMT",
"version": "v1"
},
{
"created": "Tue, 29 Jan 2002 17:13:38 GMT",
"version": "v2"
}
] | 2015-06-25 | [
[
"Fornengo",
"Nicolao",
"",
"U. of Torino and INFN, Torino"
]
] | This report is a brief review of the efforts to explain the nature of non-baryonic dark matter and of the studies devoted to the search for relic particles. Among the different dark matter candidates, special attention is devoted to relic neutralinos, by giving an overview of the recent calculations of its relic abundance and detection rates in a wide variety of supersymmetric schemes. |
hep-ph/9910363 | Marek Gazdzicki | Marek Gazdzicki | Evidence for Quark Gluon Plasma from Hadron Production in High Energy
Nuclear Collisions | null | Nucl.Phys. A681 (2001) 153-156 | 10.1016/S0375-9474(00)00497-8 | null | hep-ph nucl-th | null | The experimental results on the pion, strangeness and J/psi production in
high energy nuclear collisions are discussed. The anomalous energy dependence
of pion and strangeness production is consistent with the hypothesis that a
transition to a deconfined phase takes place between the top AGS (15 AGeV) and
the SPS (200 AGeV) energies. The J/psi production systematics at the SPS can be
understood assuming that the J/psi mesons are created at hadronization
according to the available hadronic phase space. This new interpretation of the
J/psi data allows one to establish a coherent picture of high energy nuclear
collisions based on the statistical approaches of the collision early stage and
hadronization. Surprisingly, the statistical model of strong interactions is
successful even in the region reserved up to now for pQCD based models.
| [
{
"created": "Fri, 15 Oct 1999 15:48:18 GMT",
"version": "v1"
}
] | 2015-06-25 | [
[
"Gazdzicki",
"Marek",
""
]
] | The experimental results on the pion, strangeness and J/psi production in high energy nuclear collisions are discussed. The anomalous energy dependence of pion and strangeness production is consistent with the hypothesis that a transition to a deconfined phase takes place between the top AGS (15 AGeV) and the SPS (200 AGeV) energies. The J/psi production systematics at the SPS can be understood assuming that the J/psi mesons are created at hadronization according to the available hadronic phase space. This new interpretation of the J/psi data allows one to establish a coherent picture of high energy nuclear collisions based on the statistical approaches of the collision early stage and hadronization. Surprisingly, the statistical model of strong interactions is successful even in the region reserved up to now for pQCD based models. |
1005.5357 | Holger Schulz | Andy Buckley, Hendrik Hoeth, Heiko Lacker, Holger Schulz, Jan Eike von
Seggern | New developments in event generator tuning techniques | To appear in the proceedings of the 13th International Workshop on
Advanced Computing and Analysis Techniques in Physics Research, ACAT2010,
Jaipur, India, February 22-27, 2010 | PoS ACAT2010:079,2010 | null | null | hep-ph physics.data-an | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Data analyses in hadron collider physics depend on background simulations
performed by Monte Carlo (MC) event generators. However, calculational
limitations and non-perturbative effects require approximate models with
adjustable parameters. In fact, we need to simultaneously tune many
phenomenological parameters in a high-dimensional parameter-space in order to
make the MC generator predictions fit the data. It is desirable to achieve this
goal without spending too much time or computing resources iterating parameter
settings and comparing the same set of plots over and over again. We present
extensions and improvements to the MC tuning system, Professor, which addresses
the aforementioned problems by constructing a fast analytic model of a MC
generator which can then be easily fitted to data. Using this procedure it is
for the first time possible to get a robust estimate of the uncertainty of
generator tunings. Furthermore, we can use these uncertainty estimates to study
the effect of new (pseudo-) data on the quality of tunings and therefore decide
if a measurement is worthwhile in the prospect of generator tuning. The
potential of the Professor method outside the MC tuning area is presented as
well.
| [
{
"created": "Fri, 28 May 2010 18:28:33 GMT",
"version": "v1"
}
] | 2011-04-20 | [
[
"Buckley",
"Andy",
""
],
[
"Hoeth",
"Hendrik",
""
],
[
"Lacker",
"Heiko",
""
],
[
"Schulz",
"Holger",
""
],
[
"von Seggern",
"Jan Eike",
""
]
] | Data analyses in hadron collider physics depend on background simulations performed by Monte Carlo (MC) event generators. However, calculational limitations and non-perturbative effects require approximate models with adjustable parameters. In fact, we need to simultaneously tune many phenomenological parameters in a high-dimensional parameter-space in order to make the MC generator predictions fit the data. It is desirable to achieve this goal without spending too much time or computing resources iterating parameter settings and comparing the same set of plots over and over again. We present extensions and improvements to the MC tuning system, Professor, which addresses the aforementioned problems by constructing a fast analytic model of a MC generator which can then be easily fitted to data. Using this procedure it is for the first time possible to get a robust estimate of the uncertainty of generator tunings. Furthermore, we can use these uncertainty estimates to study the effect of new (pseudo-) data on the quality of tunings and therefore decide if a measurement is worthwhile in the prospect of generator tuning. The potential of the Professor method outside the MC tuning area is presented as well. |
0806.3225 | Chiara Arina | C.Arina (Turin U. & INFN, Turin), F.Bazzocchi (Valencia U., IFIC),
N.Fornengo (Turin U. & INFN, Turin), J.C.Romao (Lisbon, IST & Lisbon, CFTP)
and J.W.F.Valle (Valencia U., IFIC) | Minimal supergravity sneutrino dark matter and inverse seesaw neutrino
masses | 4 pages, 4 figures | Phys.Rev.Lett.101:161802,2008 | 10.1103/PhysRevLett.101.161802 | null | hep-ph astro-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We show that within the inverse seesaw mechanism for generating neutrino
masses minimal supergravity is more likely to have a sneutrino as the lightest
superparticle than the conventional neutralino. We also demonstrate that such
schemes naturally reconcile the small neutrino masses with the correct relic
sneutrino dark matter abundance and accessible direct detection rates in
nuclear recoil experiments.
| [
{
"created": "Thu, 19 Jun 2008 16:12:34 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Arina",
"C.",
"",
"Turin U. & INFN, Turin"
],
[
"Bazzocchi",
"F.",
"",
"Valencia U., IFIC"
],
[
"Fornengo",
"N.",
"",
"Turin U. & INFN, Turin"
],
[
"Romao",
"J. C.",
"",
"Lisbon, IST & Lisbon, CFTP"
],
[
"Valle",
"J. W. F.",
"",
"Valencia U., IFIC"
]
] | We show that within the inverse seesaw mechanism for generating neutrino masses minimal supergravity is more likely to have a sneutrino as the lightest superparticle than the conventional neutralino. We also demonstrate that such schemes naturally reconcile the small neutrino masses with the correct relic sneutrino dark matter abundance and accessible direct detection rates in nuclear recoil experiments. |
hep-ph/0607054 | Stephen Barr | S.M. Barr and Almas Khan | Extra $Z$ bosons and low-energy tests of unification | 27 pages, LaTex, no figures. Changed content. References added. Typos
corrected | Phys.Rev.D74:085023,2006 | 10.1103/PhysRevD.74.085023 | null | hep-ph | null | If there is an extra U(1) gauge symmetry broken at low energies, then it may
be possible from the charges of the known quarks and leptons under this U(1) to
make inferences about how much gauge unification occurs at high scales and
about the unification group. (For instance, there are certain observed
properties of an extra $U(1)'$ that would be inconsistent with unification in
four dimensions at high scales.) A general analysis is presented. Two criteria
used in this analysis are (1) the degree to which the generator of the extra
U(1) mixes with hypercharge, and (2) the ratio of the extra U(1) charge of the
"10" and the "$\bar{5}$" of quarks and leptons.
| [
{
"created": "Wed, 5 Jul 2006 15:27:01 GMT",
"version": "v1"
},
{
"created": "Tue, 11 Jul 2006 19:21:52 GMT",
"version": "v2"
}
] | 2011-05-12 | [
[
"Barr",
"S. M.",
""
],
[
"Khan",
"Almas",
""
]
] | If there is an extra U(1) gauge symmetry broken at low energies, then it may be possible from the charges of the known quarks and leptons under this U(1) to make inferences about how much gauge unification occurs at high scales and about the unification group. (For instance, there are certain observed properties of an extra $U(1)'$ that would be inconsistent with unification in four dimensions at high scales.) A general analysis is presented. Two criteria used in this analysis are (1) the degree to which the generator of the extra U(1) mixes with hypercharge, and (2) the ratio of the extra U(1) charge of the "10" and the "$\bar{5}$" of quarks and leptons. |
0705.2501 | Francis Bernardeau | Francis Bernardeau and Tristan Brunier (SPhT Saclay) | Non-Gaussianities in extended D-term inflation | 12 pages, 7 figures, submitted to Phys. Rev. D | Phys.Rev.D76:043526,2007 | 10.1103/PhysRevD.76.043526 | Saclay T07/005 | hep-ph astro-ph | null | We explore extensions of hybrid inflationary models in the context of
supersymmetric D-term inflation. We point out that a large variety of
inflationary scenarios can be encountered when the field content is extended.
It is not only possible to get curvaton type models but also scenarios in which
different fields, with nontrivial statistical properties, contribute to the
primordial curvature fluctuations. We explore more particularly the parameter
space of these multiple field inflationary models. It is shown that there
exists a large domain in which significant primordial non-Gaussianities can be
produced while preserving a scale free power spectrum for the metric
fluctuations. In particular we explicitly compute the expected bi- and
trispectrum for such models and compared the results to the current and
expected observational constraints. It is shown that it is necessary to use
both the bi- and tri-spectra of CMB anisotropies to efficiently reduce their
parameter space.
| [
{
"created": "Thu, 17 May 2007 09:25:09 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Bernardeau",
"Francis",
"",
"SPhT Saclay"
],
[
"Brunier",
"Tristan",
"",
"SPhT Saclay"
]
] | We explore extensions of hybrid inflationary models in the context of supersymmetric D-term inflation. We point out that a large variety of inflationary scenarios can be encountered when the field content is extended. It is not only possible to get curvaton type models but also scenarios in which different fields, with nontrivial statistical properties, contribute to the primordial curvature fluctuations. We explore more particularly the parameter space of these multiple field inflationary models. It is shown that there exists a large domain in which significant primordial non-Gaussianities can be produced while preserving a scale free power spectrum for the metric fluctuations. In particular we explicitly compute the expected bi- and trispectrum for such models and compared the results to the current and expected observational constraints. It is shown that it is necessary to use both the bi- and tri-spectra of CMB anisotropies to efficiently reduce their parameter space. |
hep-ph/0008228 | D. P. Roy | Utpal Chattopadhyay, Amitava Datta, Anindya Datta, Aseshkrishna Datta
and D.P. Roy | LHC Signature of the Minimal SUGRA Model with a Large Soft Scalar Mass | Small clarifications added. Final version to appear in Phys. Lett. B | Phys.Lett. B493 (2000) 127-134 | 10.1016/S0370-2693(00)01120-5 | TIFR/TH/00-42 | hep-ph | null | Thanks to the focus point phenomenon, it is quite {\it natural} for the
minimal SUGRA model to have a large soft scalar mass m_0 > 1 TeV. A distinctive
feature of this model is an inverted hierarchy, where the lighter stop has a
significantly smaller mass than the other squarks and sleptons. Consequently,
the gluino is predicted to decay dominantly via stop exchange into a channel
containing 2b and 2W along with the LSP. We exploit this feature to construct a
robust signature for this model at the LHC in leptonic channels with 3-4 b-tags
and a large missing-E_T.
| [
{
"created": "Tue, 22 Aug 2000 13:16:56 GMT",
"version": "v1"
},
{
"created": "Fri, 22 Sep 2000 07:38:08 GMT",
"version": "v2"
}
] | 2009-10-31 | [
[
"Chattopadhyay",
"Utpal",
""
],
[
"Datta",
"Amitava",
""
],
[
"Datta",
"Anindya",
""
],
[
"Datta",
"Aseshkrishna",
""
],
[
"Roy",
"D. P.",
""
]
] | Thanks to the focus point phenomenon, it is quite {\it natural} for the minimal SUGRA model to have a large soft scalar mass m_0 > 1 TeV. A distinctive feature of this model is an inverted hierarchy, where the lighter stop has a significantly smaller mass than the other squarks and sleptons. Consequently, the gluino is predicted to decay dominantly via stop exchange into a channel containing 2b and 2W along with the LSP. We exploit this feature to construct a robust signature for this model at the LHC in leptonic channels with 3-4 b-tags and a large missing-E_T. |
hep-ph/0512167 | Jon Pumplin | J. Pumplin, A. Belyaev, J. Huston, D. Stump, and W.K. Tung | Parton Distributions and the Strong Coupling Strength: CTEQ6AB PDFs | 15 pages, 11 figures, revisions and change in title based on JHEP
referee's suggestions; reference added | JHEP0602:032,2006 | 10.1088/1126-6708/2006/02/032 | MSU-HEP-121205 | hep-ph | null | We study the global analysis for parton distributions as a function of the
QCD strong coupling strength alpha_s, and present a new series of distributions
that span the range 0.110 < alpha_s(m_Z) < 0.128. We use these distributions to
explore the correlation between alpha_s and the gluon distribution; the
viability of global analysis as a method to measure alpha_s; and the dependence
on alpha_s of predictions for W, Z, inclusive jet, and Higgs boson production
($b \bar{b} \to H$ and $gg \to H$) cross sections at the Tevatron and the LHC.
We find that the uncertainty in alpha_s is the dominant source of uncertainty
for inclusive jet production at moderately small p_T and for Higgs production
at intermediate masses in the standard model.
| [
{
"created": "Tue, 13 Dec 2005 19:40:24 GMT",
"version": "v1"
},
{
"created": "Tue, 20 Dec 2005 22:04:43 GMT",
"version": "v2"
},
{
"created": "Tue, 31 Jan 2006 17:24:08 GMT",
"version": "v3"
},
{
"created": "Thu, 2 Feb 2006 20:40:52 GMT",
"version": "v4"
}
] | 2009-11-11 | [
[
"Pumplin",
"J.",
""
],
[
"Belyaev",
"A.",
""
],
[
"Huston",
"J.",
""
],
[
"Stump",
"D.",
""
],
[
"Tung",
"W. K.",
""
]
] | We study the global analysis for parton distributions as a function of the QCD strong coupling strength alpha_s, and present a new series of distributions that span the range 0.110 < alpha_s(m_Z) < 0.128. We use these distributions to explore the correlation between alpha_s and the gluon distribution; the viability of global analysis as a method to measure alpha_s; and the dependence on alpha_s of predictions for W, Z, inclusive jet, and Higgs boson production ($b \bar{b} \to H$ and $gg \to H$) cross sections at the Tevatron and the LHC. We find that the uncertainty in alpha_s is the dominant source of uncertainty for inclusive jet production at moderately small p_T and for Higgs production at intermediate masses in the standard model. |
hep-ph/0309297 | Mrinal Dasgupta | Mrinal Dasgupta | Status of resummed predictions for QCD final state observables | 7 pages. Invited talk at QCD 03, Montpellier | null | 10.1016/j.nuclphysbps.2004.04.136 | null | hep-ph | null | We provide a brief review of the current status of resummed predictions for
QCD final state observables such as event shapes and jet rates in a variety of
different hard processes. Particular emphasis is given to more recent
developments such as the study of non global observables, development of
generalized resummation formulae and resummations for new types of event shape
variables.
| [
{
"created": "Thu, 25 Sep 2003 20:18:44 GMT",
"version": "v1"
}
] | 2009-11-10 | [
[
"Dasgupta",
"Mrinal",
""
]
] | We provide a brief review of the current status of resummed predictions for QCD final state observables such as event shapes and jet rates in a variety of different hard processes. Particular emphasis is given to more recent developments such as the study of non global observables, development of generalized resummation formulae and resummations for new types of event shape variables. |
0910.2211 | Markus Ahlers | Markus Ahlers | Axions and other (Super-)WISPs | 5 pages, proceedings of the 5th Patras Workshop, Durham, UK, 13-17
July 2009 | null | null | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present some bottom-up motivations of axions and other weakly interacting
sub-eV particles (WISPs) coupling to photons. Typically, these light particles
are strongly constrained by their production or interaction in astrophysical
and cosmological environments. Dedicated laboratory searches can provide
complementary probes that are mostly less sensitive but also less
model-dependent. We briefly comment on future experiments with the potential to
discover photon oscillation effects in kinetic mixing scenarios with massive
hidden photons.
| [
{
"created": "Mon, 12 Oct 2009 17:43:14 GMT",
"version": "v1"
}
] | 2009-10-13 | [
[
"Ahlers",
"Markus",
""
]
] | We present some bottom-up motivations of axions and other weakly interacting sub-eV particles (WISPs) coupling to photons. Typically, these light particles are strongly constrained by their production or interaction in astrophysical and cosmological environments. Dedicated laboratory searches can provide complementary probes that are mostly less sensitive but also less model-dependent. We briefly comment on future experiments with the potential to discover photon oscillation effects in kinetic mixing scenarios with massive hidden photons. |
hep-ph/9507378 | Michael Dine | Michael Dine, Ann E. Nelson, Yosef Nir and Yuri Shirman | New Tools for Low Energy Dynamical Supersymmetry Breaking | 32 pages and one figure; compressed post script | Phys. Rev. D 53, 2658 (1996) | 10.1103/PhysRevD.53.2658 | SCIPP 95/32 | hep-ph hep-th | null | We report the construction of large new classes of models which break
supersymmetry dynamically. We then turn to model building. Two of the principal
obstacles to constructing simple models of dynamical supersymmetry breaking are
the appearance of Fayet-Iliopoulos D terms and difficulties in generating a
$\mu$ term for the Higgs fields. Among the new models are examples in which
symmetries prevent the appearance of Fayet-Iliopoulos terms. A gauge singlet
field, that may play a role in explaining the hierarchy in quark and lepton
parameters, can generate a suitable $\mu$ term. The result is a comparatively
simple model, with a low energy structure similar to that of the MSSM, but with
far fewer arbitrary parameters. We begin the study of the phenomenology of
these models.
| [
{
"created": "Fri, 21 Jul 1995 18:32:44 GMT",
"version": "v1"
},
{
"created": "Tue, 1 Aug 1995 19:56:34 GMT",
"version": "v2"
}
] | 2016-08-24 | [
[
"Dine",
"Michael",
""
],
[
"Nelson",
"Ann E.",
""
],
[
"Nir",
"Yosef",
""
],
[
"Shirman",
"Yuri",
""
]
] | We report the construction of large new classes of models which break supersymmetry dynamically. We then turn to model building. Two of the principal obstacles to constructing simple models of dynamical supersymmetry breaking are the appearance of Fayet-Iliopoulos D terms and difficulties in generating a $\mu$ term for the Higgs fields. Among the new models are examples in which symmetries prevent the appearance of Fayet-Iliopoulos terms. A gauge singlet field, that may play a role in explaining the hierarchy in quark and lepton parameters, can generate a suitable $\mu$ term. The result is a comparatively simple model, with a low energy structure similar to that of the MSSM, but with far fewer arbitrary parameters. We begin the study of the phenomenology of these models. |
1612.08649 | Ou Z. Labun | Ou Z. Labun | Effective field theories for quantum chromo- and electrodynamics | Ph.D. Thesis; 459 pages; 83 figures; Chapter 2 partially based on the
works arXiv:1201.1508, arXiv:1504.04006, arXiv:1601.03093 | null | null | null | hep-ph nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this dissertation, I introduce the principles and methods of effective
field theory and describe my work in three EFTs: First, in the perturbative QCD
region, I use soft collinear effective theory (SCET) to prove that strong
interaction soft radiation is universal and to increase the QCD accuracy to
next-to-next-tonext- to leading logarithm order for new particle searches in
hadron colliders. I also compute a new class of non-perturbative, large
logarithmic enhancement arising near the elastic limits of deep inelastic
scattering and Drell-Yan processes. Second, in the QCD confinement region, I
use heavy hadron chiral perturbation theory to study near-threshold
enhancements in the scattering of $D$ and $\pi$ mesons near the threshold for
the excited $D$-meson state, $D^*$, as well as in the scattering of $D$ and
$D^*$ mesons near the threshold for the exotic hadron X(3872). This work
provides a clear picture of the hadronic molecule X(3872) and more profound
understanding of the nuclear force between hadrons. Finally, inspired by SCET,
I construct a new electron-laser effective field theory to describe
highly-relativistic electrons traveling in strong laser fields, extract the
universal distribution of electrons in strong electromagnetic backgrounds and
its evolution in energy from the separated momentum scales of emitted photons
and classical radiation, and predict the rate of wide angle photon emission. I
conclude with limitations of EFT methods and some perspectives on what new work
may be achieved with these EFTs.
| [
{
"created": "Sat, 24 Dec 2016 17:30:51 GMT",
"version": "v1"
},
{
"created": "Wed, 28 Dec 2016 02:39:15 GMT",
"version": "v2"
}
] | 2016-12-30 | [
[
"Labun",
"Ou Z.",
""
]
] | In this dissertation, I introduce the principles and methods of effective field theory and describe my work in three EFTs: First, in the perturbative QCD region, I use soft collinear effective theory (SCET) to prove that strong interaction soft radiation is universal and to increase the QCD accuracy to next-to-next-tonext- to leading logarithm order for new particle searches in hadron colliders. I also compute a new class of non-perturbative, large logarithmic enhancement arising near the elastic limits of deep inelastic scattering and Drell-Yan processes. Second, in the QCD confinement region, I use heavy hadron chiral perturbation theory to study near-threshold enhancements in the scattering of $D$ and $\pi$ mesons near the threshold for the excited $D$-meson state, $D^*$, as well as in the scattering of $D$ and $D^*$ mesons near the threshold for the exotic hadron X(3872). This work provides a clear picture of the hadronic molecule X(3872) and more profound understanding of the nuclear force between hadrons. Finally, inspired by SCET, I construct a new electron-laser effective field theory to describe highly-relativistic electrons traveling in strong laser fields, extract the universal distribution of electrons in strong electromagnetic backgrounds and its evolution in energy from the separated momentum scales of emitted photons and classical radiation, and predict the rate of wide angle photon emission. I conclude with limitations of EFT methods and some perspectives on what new work may be achieved with these EFTs. |
hep-ph/9310225 | Nils A. Tornqvist | Nils A. T\"ornqvist | On Deusons or Deuteronlike Meson-Meson Bound States | Invited talk at the Hadron93 International Conf. on Hadron
Spectroscopy, Como, Italy 22.-25.6. 1993. 5 pages in LATEX HU-SEFT R 1993-13b | NuovoCim.A107:2471-2476,1994 | 10.1007/BF02734018 | null | hep-ph | null | The systematics of deuteronlike two-meson bound states, {\it deusons}, is
discussed. Previous arguments that many of the present non-$q\bar q$ states are
such states are elaborated including, in particular, the tensor potential. For
pseudoscalar states the important observation is made that the centrifugal
barrier from the P-wave can be overcome by the $1/r^2$ and $1/r^3$ terms of the
tensor potential. In the heavy meson sector one-pion exchange alone is strong
enough to form at least deuteron-like $B\bar B^*$ and $B^*\bar B^*$ composites
bound by approximately 50 MeV, while $D\bar D^*$ and $D^*\bar D^*$ states are
expected near the threshold.
| [
{
"created": "Tue, 5 Oct 1993 09:35:56 GMT",
"version": "v1"
},
{
"created": "Wed, 6 Oct 1993 09:03:51 GMT",
"version": "v2"
}
] | 2008-11-26 | [
[
"Törnqvist",
"Nils A.",
""
]
] | The systematics of deuteronlike two-meson bound states, {\it deusons}, is discussed. Previous arguments that many of the present non-$q\bar q$ states are such states are elaborated including, in particular, the tensor potential. For pseudoscalar states the important observation is made that the centrifugal barrier from the P-wave can be overcome by the $1/r^2$ and $1/r^3$ terms of the tensor potential. In the heavy meson sector one-pion exchange alone is strong enough to form at least deuteron-like $B\bar B^*$ and $B^*\bar B^*$ composites bound by approximately 50 MeV, while $D\bar D^*$ and $D^*\bar D^*$ states are expected near the threshold. |
1108.4612 | Igor O. Cherednikov | I.O. Cherednikov, A.I. Karanikas, N.G. Stefanis | Wilson lines in the operator definition of TMDs: spin degrees of freedom
and renormalization | 5 pages, 2 figures. Invited talk given at the XIX International
Workshop on Deep Inelastic Scattering (DIS 2011), 11 - 15 Apr 2011, Thomas
Jefferson National Accelerator Facility, Newport News (VA) | null | null | RUB-TPII-05/2011 | hep-ph hep-lat | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A generalized idea of gauge invariance, that embodies into the Wilson lines
the spin-dependent Pauli term $\sim F^{\mu\nu}[\gamma_\mu, \gamma_\nu]$, is
applied to set up a new framework for the operator definition of
transverse-momentum-dependent parton densities (TMDs). We show that such a
treatment of gauge invariance is justified, since it does not change the
leading-twist behavior of the TMDs, albeit it contributes to their twist-three
properties, in particular, to their anomalous dimensions. We discuss other
consequences of this generalization and its possible applications to lattice
simulations of the TMDs.
| [
{
"created": "Tue, 23 Aug 2011 14:32:14 GMT",
"version": "v1"
}
] | 2011-08-24 | [
[
"Cherednikov",
"I. O.",
""
],
[
"Karanikas",
"A. I.",
""
],
[
"Stefanis",
"N. G.",
""
]
] | A generalized idea of gauge invariance, that embodies into the Wilson lines the spin-dependent Pauli term $\sim F^{\mu\nu}[\gamma_\mu, \gamma_\nu]$, is applied to set up a new framework for the operator definition of transverse-momentum-dependent parton densities (TMDs). We show that such a treatment of gauge invariance is justified, since it does not change the leading-twist behavior of the TMDs, albeit it contributes to their twist-three properties, in particular, to their anomalous dimensions. We discuss other consequences of this generalization and its possible applications to lattice simulations of the TMDs. |
hep-ph/0308222 | Nikolaos Kidonakis | Nikolaos Kidonakis and Ramona Vogt | Next-to-next-to-leading order soft-gluon corrections in top quark
hadroproduction | 22 pages, 10 figures | Phys.Rev. D68 (2003) 114014 | 10.1103/PhysRevD.68.114014 | Cavendish-HEP-03/16, LBNL-53599 | hep-ph | null | We calculate next-to-next-to-leading order soft-gluon corrections to top
quark total and differential cross sections in hadron colliders. We increase
the accuracy of our previous estimates by including additional subleading
terms, including next-to-next-to-next-to-leading-logarithmic and some virtual
terms. We show that the kinematics dependence of the cross section vanishes
near threshold and is reduced away from it. The factorization and
renormalization scale dependence of the cross section is also greatly reduced.
We present results for the top quark total cross sections and transverse
momentum distributions at the Tevatron and the LHC.
| [
{
"created": "Thu, 21 Aug 2003 16:18:14 GMT",
"version": "v1"
}
] | 2009-11-10 | [
[
"Kidonakis",
"Nikolaos",
""
],
[
"Vogt",
"Ramona",
""
]
] | We calculate next-to-next-to-leading order soft-gluon corrections to top quark total and differential cross sections in hadron colliders. We increase the accuracy of our previous estimates by including additional subleading terms, including next-to-next-to-next-to-leading-logarithmic and some virtual terms. We show that the kinematics dependence of the cross section vanishes near threshold and is reduced away from it. The factorization and renormalization scale dependence of the cross section is also greatly reduced. We present results for the top quark total cross sections and transverse momentum distributions at the Tevatron and the LHC. |
1103.2884 | Mirzayusuf Musakhanov | M. Musakhanov | Heavy and light quarks in the instanton vacuum | Talk given at the workshop "Hadron Nuclear Physics 2011", APCTP,
Pohang, Republic of Korea, Feb. 21-24, 2011. The workshop proceedings will be
published at the EPJ web of conferences (http://www.epj-conferences.org/) | null | 10.1051/epjconf/20122001004 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Assuming the gluon field is well approximated by instanton configurations we
derive a light quarks determinant and calculate its contribution to the
specific heavy quarks correlators -- namely, the heavy quark propagator and
heavy quark-aniquark correlator, receiving the instanton generated light-heavy
quarks interaction terms contributions. With these knowledge we calculate the
light quark contribution to the interaction between heavy quarks, which might
be essential for the properties of a few heavy quarks systems.
| [
{
"created": "Tue, 15 Mar 2011 11:39:12 GMT",
"version": "v1"
}
] | 2015-05-27 | [
[
"Musakhanov",
"M.",
""
]
] | Assuming the gluon field is well approximated by instanton configurations we derive a light quarks determinant and calculate its contribution to the specific heavy quarks correlators -- namely, the heavy quark propagator and heavy quark-aniquark correlator, receiving the instanton generated light-heavy quarks interaction terms contributions. With these knowledge we calculate the light quark contribution to the interaction between heavy quarks, which might be essential for the properties of a few heavy quarks systems. |
2309.07373 | Hungchong Kim | Hungchong Kim and K.S.Kim | Signatures for tetraquark mixing from partial decay widths of the two
light-meson nonets | 4 pages, Talk given at the 17th International Workshop on Meson
Physics(MESON2023), 22nd - 27th June 2023, KRAK\'OW, POLAND | null | null | null | hep-ph hep-ex nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this talk, we present successful aspects of the tetraquark mixing model
for the two light-meson nonets in the $J^{PC} = 0^{++}$ channel, the light
nonet [$a_0(980)$, $K_0^*(700)$, $f_0(500)$, $f_0(980)$] and the heavy nonet
[$a_0(1450)$, $K_0^*(1430)$, $f_0(1370)$, $f_0(1500)$]. In particular, we focus
on how their experimental partial decay widths extracted from Particle Data
Group (PDG) can support this mixing model. Currently, the experimental data
exhibit an unnatural tendency that partial widths of the light nonet are
consistently larger than those of the heavy nonet. This unnatural tendency can
be explained if the coupling into two pseudoscalar mesons is enhanced in the
light nonet and suppressed in the heavy nonet as predicted by the tetraquark
mixing model. Therefore, this could be strong evidence to support for the
tetraquark mixing model.
| [
{
"created": "Thu, 14 Sep 2023 01:17:22 GMT",
"version": "v1"
}
] | 2023-09-15 | [
[
"Kim",
"Hungchong",
""
],
[
"Kim",
"K. S.",
""
]
] | In this talk, we present successful aspects of the tetraquark mixing model for the two light-meson nonets in the $J^{PC} = 0^{++}$ channel, the light nonet [$a_0(980)$, $K_0^*(700)$, $f_0(500)$, $f_0(980)$] and the heavy nonet [$a_0(1450)$, $K_0^*(1430)$, $f_0(1370)$, $f_0(1500)$]. In particular, we focus on how their experimental partial decay widths extracted from Particle Data Group (PDG) can support this mixing model. Currently, the experimental data exhibit an unnatural tendency that partial widths of the light nonet are consistently larger than those of the heavy nonet. This unnatural tendency can be explained if the coupling into two pseudoscalar mesons is enhanced in the light nonet and suppressed in the heavy nonet as predicted by the tetraquark mixing model. Therefore, this could be strong evidence to support for the tetraquark mixing model. |
1002.4096 | Alexandre Arbey | A. Arbey, F. Mahmoudi | LHC and ILC Data and the Early Universe Properties | 6 pages, 2 figures, contribution to the proceedings of the workshop
"LC09: e+e- Physics at the TeV Scale and the Dark Matter Connection",
Perugia, September 21 - 24, 2009, Italy. v2: reference added | null | 10.1393/ncc/i2010-10593-1 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | With the start-up of the LHC, we can hope to find evidences for new physics
beyond the Standard Model, and particle candidates for dark matter. Determining
the parameters of the full underlying theory will be a long process requiring
the combination of LHC and ILC data, flavor physics constraints, and
cosmological observations. However, the Very Early Universe properties, from
which the relic particles originate, are poorly known, and the relic density
calculation can be easily falsified by hidden processes. We consider
supersymmetry and show that determining the underlying particle physics
parameters will help understanding the Very Early Universe properties.
| [
{
"created": "Mon, 22 Feb 2010 11:21:58 GMT",
"version": "v1"
},
{
"created": "Thu, 25 Feb 2010 17:35:07 GMT",
"version": "v2"
}
] | 2022-03-02 | [
[
"Arbey",
"A.",
""
],
[
"Mahmoudi",
"F.",
""
]
] | With the start-up of the LHC, we can hope to find evidences for new physics beyond the Standard Model, and particle candidates for dark matter. Determining the parameters of the full underlying theory will be a long process requiring the combination of LHC and ILC data, flavor physics constraints, and cosmological observations. However, the Very Early Universe properties, from which the relic particles originate, are poorly known, and the relic density calculation can be easily falsified by hidden processes. We consider supersymmetry and show that determining the underlying particle physics parameters will help understanding the Very Early Universe properties. |
1802.02366 | Micha{\l} Szleper | Jan Kalinowski, Pawe{\l} Koz\'ow, Stefan Pokorski, Janusz Rosiek,
Micha{\l} Szleper, S{\l}awomir Tkaczyk | Same-sign WW scattering at the LHC: can we discover BSM effects before
discovering new states? | 24 pages | Eur. Phys. J. C (2018) 78: 403 | 10.1140/epjc/s10052-018-5885-y | CERN-TH-2017-269 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | It is possible that measurements of vector boson scattering (VBS) at the LHC
will reveal disagreement with Standard Model predictions, but no new particles
will be observed directly. The task is then to learn as much as possible about
the new physics from a VBS analysis carried within the framework of the
Effective Field Theory (EFT). In this paper we discuss issues related to the
correct usage of the EFT when the WW invariant mass is not directly accessible
experimentally, as in purely leptonic W decay channels. The strategies for
future data analyses in case such scenario indeed occurs are proposed.
| [
{
"created": "Wed, 7 Feb 2018 09:27:16 GMT",
"version": "v1"
},
{
"created": "Thu, 7 Jun 2018 13:27:46 GMT",
"version": "v2"
}
] | 2018-06-08 | [
[
"Kalinowski",
"Jan",
""
],
[
"Kozów",
"Paweł",
""
],
[
"Pokorski",
"Stefan",
""
],
[
"Rosiek",
"Janusz",
""
],
[
"Szleper",
"Michał",
""
],
[
"Tkaczyk",
"Sławomir",
""
]
] | It is possible that measurements of vector boson scattering (VBS) at the LHC will reveal disagreement with Standard Model predictions, but no new particles will be observed directly. The task is then to learn as much as possible about the new physics from a VBS analysis carried within the framework of the Effective Field Theory (EFT). In this paper we discuss issues related to the correct usage of the EFT when the WW invariant mass is not directly accessible experimentally, as in purely leptonic W decay channels. The strategies for future data analyses in case such scenario indeed occurs are proposed. |
1107.2117 | Frank Tackmann | Iain W. Stewart and Frank J. Tackmann | Theory Uncertainties for Higgs and Other Searches Using Jet Bins | 13 pages, 4 figures; v2: journal version | null | 10.1103/PhysRevD.85.034011 | null | hep-ph hep-ex nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Bounds on the Higgs mass from the Tevatron and LHC are determined using
exclusive jet bins to maximize sensitivity. Scale variation in exclusive
fixed-order predictions underestimates the perturbative uncertainty for these
cross sections, due to cancellations between the perturbative corrections
leading to large K factors and those that induce logarithmic sensitivity to the
jet-bin boundary. To account for this, we propose that scale variation in the
fixed-order calculations should be used to determine theory uncertainties for
inclusive jet cross sections, whose differences yield exclusive jet cross
sections. This yields a theory correlation matrix for the jet bins such that
the additional uncertainty from large logarithms due to the jet boundary
cancels when neighboring bins are added. This procedure is tested for H + 0, 1
jets, WW + 0 jets, and W + 0, 1, 2 jets, and found to be generally applicable.
For a case where the higher-order resummation of the jet boundary corrections
is known, we show that this procedure yields fixed-order uncertainties which
are theoretically consistent with those obtained in the resummed calculation.
| [
{
"created": "Mon, 11 Jul 2011 20:00:02 GMT",
"version": "v1"
},
{
"created": "Wed, 1 Feb 2012 11:08:40 GMT",
"version": "v2"
}
] | 2013-05-30 | [
[
"Stewart",
"Iain W.",
""
],
[
"Tackmann",
"Frank J.",
""
]
] | Bounds on the Higgs mass from the Tevatron and LHC are determined using exclusive jet bins to maximize sensitivity. Scale variation in exclusive fixed-order predictions underestimates the perturbative uncertainty for these cross sections, due to cancellations between the perturbative corrections leading to large K factors and those that induce logarithmic sensitivity to the jet-bin boundary. To account for this, we propose that scale variation in the fixed-order calculations should be used to determine theory uncertainties for inclusive jet cross sections, whose differences yield exclusive jet cross sections. This yields a theory correlation matrix for the jet bins such that the additional uncertainty from large logarithms due to the jet boundary cancels when neighboring bins are added. This procedure is tested for H + 0, 1 jets, WW + 0 jets, and W + 0, 1, 2 jets, and found to be generally applicable. For a case where the higher-order resummation of the jet boundary corrections is known, we show that this procedure yields fixed-order uncertainties which are theoretically consistent with those obtained in the resummed calculation. |
1208.2129 | Aysuhan Ozansoy | A. Ozansoy and A. A. Billur | Search for excited electrons through $\gamma\gamma$ scattering | 10 pages, 6 figures, accepted for publication in PRD | null | 10.1103/PhysRevD.86.055008 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the potential of $\gamma \gamma$ option of future high energy linear
$e^{+}e^{-}$ colliders to search for excited electrons with spin-1/2. We
calculate single production cross sections, give the angular distributions and
$f-m^*$ contour plots for $\sqrt{s}=0.5$ TeV and $\sqrt{s}=3$ TeV both using
the standard (tree level) couplings and anomal couplings.
| [
{
"created": "Fri, 10 Aug 2012 09:44:25 GMT",
"version": "v1"
}
] | 2015-06-11 | [
[
"Ozansoy",
"A.",
""
],
[
"Billur",
"A. A.",
""
]
] | We study the potential of $\gamma \gamma$ option of future high energy linear $e^{+}e^{-}$ colliders to search for excited electrons with spin-1/2. We calculate single production cross sections, give the angular distributions and $f-m^*$ contour plots for $\sqrt{s}=0.5$ TeV and $\sqrt{s}=3$ TeV both using the standard (tree level) couplings and anomal couplings. |
hep-ph/0111057 | David Grellscheid | B.C. Allanach, D. Grellscheid, F. Quevedo | Selecting Supersymmetric String Scenarios From Sparticle Spectra | 24 pages, 10 figures; limits from muon g-2 revised to most recent
value with corresponding changes in conclusions; added short discussion of
negative mu | JHEP 0205 (2002) 048 | 10.1088/1126-6708/2002/05/048 | CERN-TH/2001-223, DAMTP-2001-74 | hep-ph hep-ex hep-th | null | We approach the following question: if supersymmetry is discovered, how can
we select among different supersymmetric extensions of the Standard Model? In
particular, we perform an analysis of the sparticle spectrum in low-energy
string effective theories, asking which observables best distinguish various
scenarios. We examine scenarios differing by the fundamental string scale and
concentrate on GUT and intermediate scale models. We scan over all parameters
(two goldstino angles, tan beta and the gravitino mass) in each scenario,
finding ratios of sparticle masses that provide the maximum discrimination
between them. The necessary accuracy for discrimination is determined in each
case. We find that the required accuracy on various sparticle mass ratios is at
the few percent level, a precision that may be achieved in future linear
colliders. We also map out phenomenologically viable regions of parameter
space.
| [
{
"created": "Tue, 6 Nov 2001 17:16:01 GMT",
"version": "v1"
},
{
"created": "Thu, 22 Nov 2001 15:59:42 GMT",
"version": "v2"
},
{
"created": "Wed, 5 Jun 2002 16:51:15 GMT",
"version": "v3"
}
] | 2009-11-07 | [
[
"Allanach",
"B. C.",
""
],
[
"Grellscheid",
"D.",
""
],
[
"Quevedo",
"F.",
""
]
] | We approach the following question: if supersymmetry is discovered, how can we select among different supersymmetric extensions of the Standard Model? In particular, we perform an analysis of the sparticle spectrum in low-energy string effective theories, asking which observables best distinguish various scenarios. We examine scenarios differing by the fundamental string scale and concentrate on GUT and intermediate scale models. We scan over all parameters (two goldstino angles, tan beta and the gravitino mass) in each scenario, finding ratios of sparticle masses that provide the maximum discrimination between them. The necessary accuracy for discrimination is determined in each case. We find that the required accuracy on various sparticle mass ratios is at the few percent level, a precision that may be achieved in future linear colliders. We also map out phenomenologically viable regions of parameter space. |
hep-ph/0009190 | Ian Low | Ian Low | Model Independent Extractions of |V_{ub}| from Inclusive B Decays | 3 pages. talk given at DPF 2000, Columbus, OH, August 11, 2000 | Int.J.Mod.Phys.A16S1B:645-647,2001 | 10.1142/S0217751X01007698 | null | hep-ph hep-ex | null | We discuss the possibility of extracting |V_{ub}| from various spectra of
inclusive B decays, without large systematic errors which usually arise from
having to model the Fermi motion of the heavy quark. This strategy can be
applied to the electron energy spectrum, as well as the hadronic mass spectrum.
Modulo violation of local hadron-parton duality, the theoretical error in the
extraction is estimated to be less than 10%.
| [
{
"created": "Fri, 15 Sep 2000 14:08:03 GMT",
"version": "v1"
}
] | 2011-02-01 | [
[
"Low",
"Ian",
""
]
] | We discuss the possibility of extracting |V_{ub}| from various spectra of inclusive B decays, without large systematic errors which usually arise from having to model the Fermi motion of the heavy quark. This strategy can be applied to the electron energy spectrum, as well as the hadronic mass spectrum. Modulo violation of local hadron-parton duality, the theoretical error in the extraction is estimated to be less than 10%. |
1801.08066 | Mikhail Zubkov Dr | S.Bondarenko, M.A.Zubkov | The dimensionally reduced description of the high energy scattering and
the effective action for the reggeized gluons | 16 pages, Latex | null | 10.1140/epjc/s10052-018-6089-1 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We discuss the high energy scattering of hadrons with the multi - Regge
kinematics. The effective $2D$ model for the interaction between the produced
hard gluons appears as a result of the dimensional reduction, which is similar
to the dimensional reduction $3+1$ D $\to 3$ D of the high temperature gauge
theory. It is demonstrated that being supplemented by the exchange by virtual
$3+1$ D gluons this $2D$ model gives rise to the hermitian version of the
effective action of Lipatov for the interaction between the ordinary and the
reggeized gluons.
| [
{
"created": "Wed, 24 Jan 2018 16:38:59 GMT",
"version": "v1"
},
{
"created": "Wed, 27 Jun 2018 21:22:36 GMT",
"version": "v2"
},
{
"created": "Fri, 29 Jun 2018 12:36:53 GMT",
"version": "v3"
}
] | 2018-08-29 | [
[
"Bondarenko",
"S.",
""
],
[
"Zubkov",
"M. A.",
""
]
] | We discuss the high energy scattering of hadrons with the multi - Regge kinematics. The effective $2D$ model for the interaction between the produced hard gluons appears as a result of the dimensional reduction, which is similar to the dimensional reduction $3+1$ D $\to 3$ D of the high temperature gauge theory. It is demonstrated that being supplemented by the exchange by virtual $3+1$ D gluons this $2D$ model gives rise to the hermitian version of the effective action of Lipatov for the interaction between the ordinary and the reggeized gluons. |
1002.3948 | Guy F. de T\'eramond | Stanley J. Brodsky, Guy F. de T\'eramond, Alexandre Deur | Nonperturbative QCD Coupling and its $\beta$ function from Light-Front
Holography | 32 pages, 7 figures. Final version published in Phys. Rev. D | Phys.Rev.D81:096010,2010 | 10.1103/PhysRevD.81.096010 | SLAC-PUB-13840, JLAB-PHY-10-1128 | hep-ph hep-lat hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The light-front holographic mapping of classical gravity in AdS space,
modified by a positive-sign dilaton background, leads to a nonperturbative
effective coupling $\alpha_s^{AdS}(Q^2)$. It agrees with hadron physics data
extracted from different observables, such as the effective charge defined by
the Bjorken sum rule, as well as with the predictions of models with built-in
confinement and lattice simulations. It also displays a transition from
perturbative to nonperturbative conformal regimes at a momentum scale $ \sim 1$
GeV. The resulting $\beta$ function appears to capture the essential
characteristics of the full $\beta$ function of QCD, thus giving further
support to the application of the gauge/gravity duality to the confining
dynamics of strongly coupled QCD. Commensurate scale relations relate
observables to each other without scheme or scale ambiguity. In this paper we
extrapolate these relations to the nonperturbative domain, thus extending the
range of predictions based on $\alpha_s^{AdS}(Q^2)$.
| [
{
"created": "Sun, 21 Feb 2010 04:42:58 GMT",
"version": "v1"
},
{
"created": "Sat, 17 Apr 2010 00:06:52 GMT",
"version": "v2"
},
{
"created": "Fri, 28 May 2010 23:25:18 GMT",
"version": "v3"
}
] | 2014-11-20 | [
[
"Brodsky",
"Stanley J.",
""
],
[
"de Téramond",
"Guy F.",
""
],
[
"Deur",
"Alexandre",
""
]
] | The light-front holographic mapping of classical gravity in AdS space, modified by a positive-sign dilaton background, leads to a nonperturbative effective coupling $\alpha_s^{AdS}(Q^2)$. It agrees with hadron physics data extracted from different observables, such as the effective charge defined by the Bjorken sum rule, as well as with the predictions of models with built-in confinement and lattice simulations. It also displays a transition from perturbative to nonperturbative conformal regimes at a momentum scale $ \sim 1$ GeV. The resulting $\beta$ function appears to capture the essential characteristics of the full $\beta$ function of QCD, thus giving further support to the application of the gauge/gravity duality to the confining dynamics of strongly coupled QCD. Commensurate scale relations relate observables to each other without scheme or scale ambiguity. In this paper we extrapolate these relations to the nonperturbative domain, thus extending the range of predictions based on $\alpha_s^{AdS}(Q^2)$. |
hep-ph/0302200 | B. L. G. Bakker | A.M. Badalian (State Research Center, Institute of Theoretical and
Experimental Physics, Moscow, Russia), B.L.G. Bakker (Department of Physics
and Astronomy, Vrije Universiteit, Amsterdam) | The $\eta_c(3654)$ and hyperfine splitting in charmonium | 8 pages RevTex | Phys.Rev.D67:071901,2003 | 10.1103/PhysRevD.67.071901 | null | hep-ph hep-ex | null | The hyperfine splitting for the 2S charmonium state is calculated and the
predicted number is $\Delta_{\rm HF}(2S) = 57 \pm 8$ MeV, being by derivation
the lower bound of this splitting. It results in $M(\eta_c(2S))= 3630 \pm 8$
MeV, which is smaller by two standard deviations than found in the Belle
experiment \cite{ref.01}, but close to the $\eta_c(2S)$ mass observed by the
same group in the experiment $e^+e^- \to J/\psi \eta_c$ \cite{ref.06} where
$M(\eta_c(2S)) = 3622 \pm 12$ MeV was found.
| [
{
"created": "Fri, 21 Feb 2003 16:57:42 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Badalian",
"A. M.",
"",
"State Research Center, Institute of Theoretical and\n Experimental Physics, Moscow, Russia"
],
[
"Bakker",
"B. L. G.",
"",
"Department of Physics\n and Astronomy, Vrije Universiteit, Amsterdam"
]
] | The hyperfine splitting for the 2S charmonium state is calculated and the predicted number is $\Delta_{\rm HF}(2S) = 57 \pm 8$ MeV, being by derivation the lower bound of this splitting. It results in $M(\eta_c(2S))= 3630 \pm 8$ MeV, which is smaller by two standard deviations than found in the Belle experiment \cite{ref.01}, but close to the $\eta_c(2S)$ mass observed by the same group in the experiment $e^+e^- \to J/\psi \eta_c$ \cite{ref.06} where $M(\eta_c(2S)) = 3622 \pm 12$ MeV was found. |
hep-ph/9912207 | Mairi Sakellariadou | Mairi Sakellariadou | Seeds of Large Scale Anisotropy in Pre-Big-Bang Cosmology | to appear in the Proceedings of the Spanish Relativity Meeting,
Bilbao, 1999. (5 pages) | Int.J.Theor.Phys. 39 (2000) 1851-1858 | null | null | hep-ph | null | Within a string cosmology context, the large scale temperature anisotropies
may arise from the contribution of seeds to the metric fluctuations. We study
the cases of electromagnetic and axion seeds. We find that massless or very
light axions can lead to a flat or slightly tilted blue spectrum, that fits
current data.
| [
{
"created": "Wed, 1 Dec 1999 15:28:06 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Sakellariadou",
"Mairi",
""
]
] | Within a string cosmology context, the large scale temperature anisotropies may arise from the contribution of seeds to the metric fluctuations. We study the cases of electromagnetic and axion seeds. We find that massless or very light axions can lead to a flat or slightly tilted blue spectrum, that fits current data. |
2204.04227 | Giovanni Grilli di Cortona | Giovanni Grilli di Cortona and Enrico Nardi | Probing light mediators at the MUonE experiment | 6 pages, 3 figures | null | 10.1103/PhysRevD.105.L111701 | null | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The MUonE experiment, that aims to provide a precise measurement of the
hadronic vacuum polarization contribution to the muon $g-2$ via elastic
muon-electron scattering, has also the potential to explore the parameter space
of light new physics. Exploiting the process $\mu^- N \to \mu^- N X$, where $N$
is the target nucleus and X is a new physics light mediator, we demonstrate
that MUonE can be sensitive to new regions of parameter space for sub-GeV dark
photons. In particular, thanks to its muon beam, MUonE will be able to explore
uncharted parameter space regions for the $L_\mu-L_\tau$ model. Finally, we
also find that MUonE can probe the parameter space of axion-like particles for
different assumptions of the couplings to electrons, muons and photons.
| [
{
"created": "Fri, 8 Apr 2022 18:00:00 GMT",
"version": "v1"
}
] | 2022-06-15 | [
[
"di Cortona",
"Giovanni Grilli",
""
],
[
"Nardi",
"Enrico",
""
]
] | The MUonE experiment, that aims to provide a precise measurement of the hadronic vacuum polarization contribution to the muon $g-2$ via elastic muon-electron scattering, has also the potential to explore the parameter space of light new physics. Exploiting the process $\mu^- N \to \mu^- N X$, where $N$ is the target nucleus and X is a new physics light mediator, we demonstrate that MUonE can be sensitive to new regions of parameter space for sub-GeV dark photons. In particular, thanks to its muon beam, MUonE will be able to explore uncharted parameter space regions for the $L_\mu-L_\tau$ model. Finally, we also find that MUonE can probe the parameter space of axion-like particles for different assumptions of the couplings to electrons, muons and photons. |
1608.01582 | Kei Yagyu | Shinya Kanemura, Mariko Kikuchi, Kei Yagyu | One-loop corrections to the Higgs self-couplings in the singlet
extension | Version accepted in NPB | null | 10.1016/j.nuclphysb.2017.02.004 | UT-HET 116 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We investigate predictions on the triple Higgs boson couplings with radiative
corrections in the model with an additional real singlet scalar field. In this
model, the second physical scalar state ($H$) appears in addition to the Higgs
boson ($h$) with the mass 125 GeV. The $hhh$ vertex is calculated at the
one-loop level, and its possible deviation from the predictions in the standard
model is evaluated under various theoretical constraints. The decay rate of $H
\to hh$ is also computed at the one-loop level. We also take into account the
bound from the precise measurement of the $W$ boson mass, which gives the upper
limit on the mixing angle $\alpha$ between two physical Higgs bosons for a
given value of the mass of $H$ ($m_H^{}$). We find that the deviation in the
$hhh$ coupling from the prediction in the standard model can maximally be about
250\%, 150\% and 75\% for $m_H^{}=300$, 500 and 1000 GeV, respectively, under
the requirement that the cutoff scale of the model is higher than 3 TeV. We
also discuss deviations from the standard model prediction in double Higgs
boson production from the gluon fusion at the LHC using the one-loop corrected
Higgs boson vertices.
| [
{
"created": "Thu, 4 Aug 2016 15:26:40 GMT",
"version": "v1"
},
{
"created": "Mon, 20 Feb 2017 07:30:27 GMT",
"version": "v2"
}
] | 2017-04-05 | [
[
"Kanemura",
"Shinya",
""
],
[
"Kikuchi",
"Mariko",
""
],
[
"Yagyu",
"Kei",
""
]
] | We investigate predictions on the triple Higgs boson couplings with radiative corrections in the model with an additional real singlet scalar field. In this model, the second physical scalar state ($H$) appears in addition to the Higgs boson ($h$) with the mass 125 GeV. The $hhh$ vertex is calculated at the one-loop level, and its possible deviation from the predictions in the standard model is evaluated under various theoretical constraints. The decay rate of $H \to hh$ is also computed at the one-loop level. We also take into account the bound from the precise measurement of the $W$ boson mass, which gives the upper limit on the mixing angle $\alpha$ between two physical Higgs bosons for a given value of the mass of $H$ ($m_H^{}$). We find that the deviation in the $hhh$ coupling from the prediction in the standard model can maximally be about 250\%, 150\% and 75\% for $m_H^{}=300$, 500 and 1000 GeV, respectively, under the requirement that the cutoff scale of the model is higher than 3 TeV. We also discuss deviations from the standard model prediction in double Higgs boson production from the gluon fusion at the LHC using the one-loop corrected Higgs boson vertices. |
hep-ph/9705410 | Whiz | A. Datta, K. Whisnant, Bing-Lin Young, and X. Zhang | b b-bar Production on the Z Resonance and Implications for LEP2 | 15 pages with minor revisions to preprint number, abstract, and text;
LaTeX, REVTeX, plus 9 postscript figures | Phys.Rev. D57 (1998) 364-372 | 10.1103/PhysRevD.57.364 | AMES-HET-97-06 | hep-ph | null | In terms of an effective lagrangian, we examine the effect of new physics
associated with third-generation fermions on b b-bar production at the Z
resonance and study its implications for LEP2. We obtain the constraints on
such operators with derivative couplings at LEP1 and the SLC, and determine the
prospects for detecting their presence at LEP2. We find that despite the small
observed deviations from the standard model on the Z resonance, much larger
deviations from standard model predictions are possible at LEP2, and the
corresponding couplings can be determined rather precisely.
| [
{
"created": "Fri, 23 May 1997 21:54:13 GMT",
"version": "v1"
},
{
"created": "Tue, 17 Jun 1997 16:43:14 GMT",
"version": "v2"
}
] | 2009-10-30 | [
[
"Datta",
"A.",
""
],
[
"Whisnant",
"K.",
""
],
[
"Young",
"Bing-Lin",
""
],
[
"Zhang",
"X.",
""
]
] | In terms of an effective lagrangian, we examine the effect of new physics associated with third-generation fermions on b b-bar production at the Z resonance and study its implications for LEP2. We obtain the constraints on such operators with derivative couplings at LEP1 and the SLC, and determine the prospects for detecting their presence at LEP2. We find that despite the small observed deviations from the standard model on the Z resonance, much larger deviations from standard model predictions are possible at LEP2, and the corresponding couplings can be determined rather precisely. |
hep-ph/0105294 | Concepcion Gonzalez-Garcia | V. Berezinsky, M.C. Gonzalez-Garcia and C. Pe\~na-Garay | Status of the Gribov-Pontecorvo Solution to the Solar Neutrino Problem | Typo and new references. RevTex, 13 pages 6 figures | Phys.Lett. B517 (2001) 149-157 | 10.1016/S0370-2693(01)01008-5 | CERN-TH/2001-140,IFIC/01-29 | hep-ph | null | We discuss the status of the Gribov-Pontecorvo (GP) solution to the solar
neutrino problem. This solution naturally appears in bimaximal neutrino mixing
and reduces the solar and atmospheric neutrino problems to vacuum oscillations
of three active neutrinos. The GP solution predicts an energy-independent
suppression of the solar neutrino flux. It is disfavoured by the rate of the
Homestake detector, but its statistical significance greatly improves, when the
chlorine rate and the boron neutrino flux are slightly rescaled, and when the
Super-Kamiokande neutrino spectrum is included in the analysis. Our results
show that rescaling of the chlorine signal by only 10% is sufficient for the GP
solution to exist, if the boron-neutrino flux is taken 10 -- 20% lower than the
SSM prediction. The regions allowed for the GP solution in the parameter space
are found and observational signatures of this solution are discussed.
| [
{
"created": "Mon, 28 May 2001 17:26:40 GMT",
"version": "v1"
},
{
"created": "Tue, 12 Jun 2001 22:51:53 GMT",
"version": "v2"
}
] | 2016-09-06 | [
[
"Berezinsky",
"V.",
""
],
[
"Gonzalez-Garcia",
"M. C.",
""
],
[
"Peña-Garay",
"C.",
""
]
] | We discuss the status of the Gribov-Pontecorvo (GP) solution to the solar neutrino problem. This solution naturally appears in bimaximal neutrino mixing and reduces the solar and atmospheric neutrino problems to vacuum oscillations of three active neutrinos. The GP solution predicts an energy-independent suppression of the solar neutrino flux. It is disfavoured by the rate of the Homestake detector, but its statistical significance greatly improves, when the chlorine rate and the boron neutrino flux are slightly rescaled, and when the Super-Kamiokande neutrino spectrum is included in the analysis. Our results show that rescaling of the chlorine signal by only 10% is sufficient for the GP solution to exist, if the boron-neutrino flux is taken 10 -- 20% lower than the SSM prediction. The regions allowed for the GP solution in the parameter space are found and observational signatures of this solution are discussed. |
hep-ph/0304240 | M. Gronau | Michael Gronau | P and CP violation in B Decays | Presented at the XXXVIII Rencontre de Moriond: Electroweak
Interactions and Unified Theories, Les Arcs, France, March 15-22, 2003 | null | null | null | hep-ph | null | While the Kobayashi--Maskawa model of CP violation passed its first crucial
precision test in $B\to J/\psi K_S$, other CP asymmetries in $B$ and $B_s$
decays will have to be measured in order to critically test and overconstrain
the model in an unambiguous way. On another front, the chirality of weak
$b$-quark couplings has not yet been carefully tested. We discuss recent
proposals for studying both the chiral and CP-violating phase structures of
these couplings in $B\to D^*\rho$ and $B\to D^*a_1$.
| [
{
"created": "Thu, 24 Apr 2003 19:15:57 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Gronau",
"Michael",
""
]
] | While the Kobayashi--Maskawa model of CP violation passed its first crucial precision test in $B\to J/\psi K_S$, other CP asymmetries in $B$ and $B_s$ decays will have to be measured in order to critically test and overconstrain the model in an unambiguous way. On another front, the chirality of weak $b$-quark couplings has not yet been carefully tested. We discuss recent proposals for studying both the chiral and CP-violating phase structures of these couplings in $B\to D^*\rho$ and $B\to D^*a_1$. |
hep-ph/9705205 | Asher Gotsman | E.Gotsman, E.Levin and U. Maor(Tel Aviv University) | Hard inclusive production and a violation of the factorization theorem | 8 pages.latex,6 figures in ps files | Phys.Lett. B406 (1997) 89-94 | 10.1016/S0370-2693(97)00623-0 | TAUP 2416/97 | hep-ph | null | A new mechanism for hard inclusive production, which leads to a violation of
the factorization theorem, is suggested. The mechanism is illustrated by a
detailed discussion of Higgs meson production in high energy deutron-deutron
scattering. Numerical estimates for the effect are given for high energy hadron
(nucleus) scattering.
| [
{
"created": "Thu, 1 May 1997 12:42:59 GMT",
"version": "v1"
},
{
"created": "Mon, 5 May 1997 12:43:53 GMT",
"version": "v2"
}
] | 2019-08-17 | [
[
"Gotsman",
"E.",
"",
"Tel Aviv University"
],
[
"Levin",
"E.",
"",
"Tel Aviv University"
],
[
"Maor",
"U.",
"",
"Tel Aviv University"
]
] | A new mechanism for hard inclusive production, which leads to a violation of the factorization theorem, is suggested. The mechanism is illustrated by a detailed discussion of Higgs meson production in high energy deutron-deutron scattering. Numerical estimates for the effect are given for high energy hadron (nucleus) scattering. |
hep-ph/9709451 | Nathan Weiss | Ken Kiers, Nathan Weiss | Coherent Neutrino Propagation in a Dense Medium | Talk presented at "Strong and Electroweak Matter" in Eger, Hungary;
May 1977: 5 Pages, 2 Figs: Latex using sprocl.sty & psfig.tex | null | null | null | hep-ph | null | Motivated by the effect of matter on neutrino oscillations (the MSW effect)
we have studied the propagation of neutrinos in a dense medium. The dispersion
relation for massive neutrinos in a medium is known to have a minimum at
nonzero momentum $p\sim G_F\rho/\sqrt{2}$. We have studied in detail the origin
and consequences of this dispersion relation for both Dirac and Majorana
neutrinos both in a toy model with only neutral currents and a single neutrino
flavour and in a realistic ``Standard Model'' with two neutrino flavours. For a
range of neutrino momenta near the minimum of the dispersion relation, Dirac
neutrinos are trapped by their coherent interactions with the medium. This
effect does not lead to the trapping of Majorana neutrinos.
| [
{
"created": "Thu, 25 Sep 1997 07:32:21 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Kiers",
"Ken",
""
],
[
"Weiss",
"Nathan",
""
]
] | Motivated by the effect of matter on neutrino oscillations (the MSW effect) we have studied the propagation of neutrinos in a dense medium. The dispersion relation for massive neutrinos in a medium is known to have a minimum at nonzero momentum $p\sim G_F\rho/\sqrt{2}$. We have studied in detail the origin and consequences of this dispersion relation for both Dirac and Majorana neutrinos both in a toy model with only neutral currents and a single neutrino flavour and in a realistic ``Standard Model'' with two neutrino flavours. For a range of neutrino momenta near the minimum of the dispersion relation, Dirac neutrinos are trapped by their coherent interactions with the medium. This effect does not lead to the trapping of Majorana neutrinos. |
hep-ph/0510250 | Dremin | I.M. Dremin | Soft and hard jets in QCD | LATEX, 4 pages, no figures. Talk given at ISMD2005 | null | 10.1063/1.2197391 | null | hep-ph | null | Multiplicity of sets of soft jets with energies ranging in some interval is
determined. The possible role of collective effects is discussed.
| [
{
"created": "Wed, 19 Oct 2005 11:58:55 GMT",
"version": "v1"
}
] | 2009-11-11 | [
[
"Dremin",
"I. M.",
""
]
] | Multiplicity of sets of soft jets with energies ranging in some interval is determined. The possible role of collective effects is discussed. |
1402.6332 | Alexander Merle | Alexander Merle, Stefano Morisi, Walter Winter | Common origin of reactor and sterile neutrino mixing | 27 pages, 5 figures; v2: analysis extended to also include non-zero
Majorana phases; accepted by JHEP | null | 10.1007/JHEP07(2014)039 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | If the hints for light sterile neutrinos from short-baseline anomalies are to
be taken seriously, global fits indicate active-sterile mixings of a magnitude
comparable to the known reactor mixing. We therefore study the conditions under
which the active-sterile and reactor mixings could have the same origin in an
underlying flavour model. As a starting point, we use $\mu-\tau$ symmetry in
the active neutrino sector, which (for three neutrinos) yields a zero reactor
neutrino angle and a maximal atmospheric one. We demonstrate that adding one
sterile neutrino can change this setting, so that the active-sterile mixing and
non-zero $\theta_{13}$ can be generated simultaneously. From the
phenomenological perspective, electron (anti)neutrino disappearance can be
easily accommodated, while muon neutrino disappearance can vanish. It is,
however, difficult to reconcile the LSND results with this scenario. From the
theory perspective, the setting requires the misalignment of some of the flavon
vacuum expectation values, which may be achieved in an $A_4$ or $D_4$ flavour
symmetry model using extra dimensions.
| [
{
"created": "Tue, 25 Feb 2014 21:00:29 GMT",
"version": "v1"
},
{
"created": "Thu, 19 Jun 2014 16:43:01 GMT",
"version": "v2"
}
] | 2015-06-18 | [
[
"Merle",
"Alexander",
""
],
[
"Morisi",
"Stefano",
""
],
[
"Winter",
"Walter",
""
]
] | If the hints for light sterile neutrinos from short-baseline anomalies are to be taken seriously, global fits indicate active-sterile mixings of a magnitude comparable to the known reactor mixing. We therefore study the conditions under which the active-sterile and reactor mixings could have the same origin in an underlying flavour model. As a starting point, we use $\mu-\tau$ symmetry in the active neutrino sector, which (for three neutrinos) yields a zero reactor neutrino angle and a maximal atmospheric one. We demonstrate that adding one sterile neutrino can change this setting, so that the active-sterile mixing and non-zero $\theta_{13}$ can be generated simultaneously. From the phenomenological perspective, electron (anti)neutrino disappearance can be easily accommodated, while muon neutrino disappearance can vanish. It is, however, difficult to reconcile the LSND results with this scenario. From the theory perspective, the setting requires the misalignment of some of the flavon vacuum expectation values, which may be achieved in an $A_4$ or $D_4$ flavour symmetry model using extra dimensions. |
hep-ph/0010001 | Mohamed Tarek Hussein | Mohamed Tarek Hussein, Nabila Mohamed Hassan and Naglaa El-Harby | Time Evolution of Fast Particles During the Decay of Hadronic Systems | 11 pages, 11 figures (eps) | Turk.J.Phys. 24 (2000) 501-510 | null | null | hep-ph | null | A phenomenological model is presented based on the formation of nuclear
thermodynamic system during the collision of heavy ions in the regime of
intermediate and high energy regions. The formulation and the dynamic picture
are determined by solving the Vlasov equation. The solution is dressed in the
form of a power series. The first term of which is the equilibrium distribution
in phase space. The rest, are time dependent perturbation terms due to the
multiple strong interactions inside the system. The temperature gradient and
the derivatives of the phase function are calculated. The time dependence of
the angular emission of the produced particles is studied. It is found that
particles emitted in the forward direction are produced in the early stage of
the reaction, far from the equilibrium. Backward production comes in a later
stage when the system constituents undergo multiple cascade collisions.
| [
{
"created": "Sat, 30 Sep 2000 19:21:12 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Hussein",
"Mohamed Tarek",
""
],
[
"Hassan",
"Nabila Mohamed",
""
],
[
"El-Harby",
"Naglaa",
""
]
] | A phenomenological model is presented based on the formation of nuclear thermodynamic system during the collision of heavy ions in the regime of intermediate and high energy regions. The formulation and the dynamic picture are determined by solving the Vlasov equation. The solution is dressed in the form of a power series. The first term of which is the equilibrium distribution in phase space. The rest, are time dependent perturbation terms due to the multiple strong interactions inside the system. The temperature gradient and the derivatives of the phase function are calculated. The time dependence of the angular emission of the produced particles is studied. It is found that particles emitted in the forward direction are produced in the early stage of the reaction, far from the equilibrium. Backward production comes in a later stage when the system constituents undergo multiple cascade collisions. |
hep-ph/9604332 | Michelangelo Mangano | S. Bethke, M.L. Mangano and P. Nason | QCD in e+e- collisions at 2 TeV | 10 pages, Latex, epsfig, 7 figures To appear in the Proceedings of
the 1995 "Workshop on Physics with e+e- Linear Colliders", Annecy-Gran
Sasso-DESY | null | null | CERN-TH/96-104 | hep-ph | null | We discuss some topics in QCD studies at 2 TeV. Particular emphasis is given
to the separation of pure QCD events from the WW and the t-tbar backgrounds
| [
{
"created": "Tue, 16 Apr 1996 13:15:24 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Bethke",
"S.",
""
],
[
"Mangano",
"M. L.",
""
],
[
"Nason",
"P.",
""
]
] | We discuss some topics in QCD studies at 2 TeV. Particular emphasis is given to the separation of pure QCD events from the WW and the t-tbar backgrounds |
hep-ph/0603232 | Patricia Ball | Patricia Ball and Roman Zwicky | |V_td/V_ts| from B-> V gamma | 23 pages; new BaBar results on B->(rho/omega)gamma included | JHEP 0604:046,2006 | 10.1088/1126-6708/2006/04/046 | IPPP/06/16, CERN-PH-TH/2006-050 | hep-ph hep-ex | null | The dominant theoretical uncertainty in extracting |V_td/V_ts| from the ratio
of branching ratios R=B(B->(rho,omega)gamma)/B(B->K* gamma) is given by the
ratio of form factors xi=T_1^{B->K*}(0)/T_1^{B->rho}(0). We re-examine xi in
the framework of QCD sum rules on the light-cone, taking into account hitherto
neglected SU(3)-breaking effects. We find xi=1.17 \pm 0.09. Using QCD
factorisation for the branching ratios, and the current experimental average
for R quoted by HFAG, this translates into |V_td/V_ts|^HFAG_{B->V gamma} =
0.192 \pm 0.014(th) \pm 0.016(exp). This result agrees, within errors, with
that obtained from the Standard Model unitarity triangle, |V_td/V_ts|_SM =
0.216 \pm 0.029, based on tree-level-only processes, and with
|V_td/V_ts|_{Delta m} = 0.2060^{+0.0081}_{-0.0060}(th) \pm 0.0007(exp), from
the CDF measurement of B_s oscillations.
| [
{
"created": "Tue, 28 Mar 2006 18:34:57 GMT",
"version": "v1"
},
{
"created": "Mon, 3 Apr 2006 12:44:23 GMT",
"version": "v2"
},
{
"created": "Mon, 25 Sep 2006 11:37:34 GMT",
"version": "v3"
}
] | 2011-03-23 | [
[
"Ball",
"Patricia",
""
],
[
"Zwicky",
"Roman",
""
]
] | The dominant theoretical uncertainty in extracting |V_td/V_ts| from the ratio of branching ratios R=B(B->(rho,omega)gamma)/B(B->K* gamma) is given by the ratio of form factors xi=T_1^{B->K*}(0)/T_1^{B->rho}(0). We re-examine xi in the framework of QCD sum rules on the light-cone, taking into account hitherto neglected SU(3)-breaking effects. We find xi=1.17 \pm 0.09. Using QCD factorisation for the branching ratios, and the current experimental average for R quoted by HFAG, this translates into |V_td/V_ts|^HFAG_{B->V gamma} = 0.192 \pm 0.014(th) \pm 0.016(exp). This result agrees, within errors, with that obtained from the Standard Model unitarity triangle, |V_td/V_ts|_SM = 0.216 \pm 0.029, based on tree-level-only processes, and with |V_td/V_ts|_{Delta m} = 0.2060^{+0.0081}_{-0.0060}(th) \pm 0.0007(exp), from the CDF measurement of B_s oscillations. |
1701.00494 | A. H. Rezaeian | Alex Kovner, Amir H. Rezaeian | DPS in CGC: HBT correlations in double inclusive photon production | 14 pages, 3 figures; v2: results unchanged, notation clarified and
corrected, references added. The version to appear in PRD | Phys. Rev. D 95, 114028 (2017) | 10.1103/PhysRevD.95.114028 | null | hep-ph hep-ex nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We introduce a technique to study double parton scattering (DPS) in the
Color-Glass-Condensate (CGC) approach. We show that the cross-section of the
DPS in the CGC approach is calculable in terms of new nonperturbative objects,
generalized double transverse momentum-dependent parton distribution (2GTMD)
functions. We investigate the production of pairs of prompt photons from two
partons in the projectile hadron in high-energy proton-nucleus collisions. We
show that even for independent partons in the projectile, the prompt photon
correlation function exhibits Hanbury Brown and Twiss (HBT) correlations. The
width of the HBT peak is controlled by the transverse distance between the
parton of the pair, which is of the order of the proton size. Thus, the HBT
measurements in two-particle production such as prompt photon pairs provide
useful information about the nonperturbative 2GTMDs.
| [
{
"created": "Mon, 2 Jan 2017 19:00:14 GMT",
"version": "v1"
},
{
"created": "Wed, 7 Jun 2017 18:14:19 GMT",
"version": "v2"
}
] | 2017-06-30 | [
[
"Kovner",
"Alex",
""
],
[
"Rezaeian",
"Amir H.",
""
]
] | We introduce a technique to study double parton scattering (DPS) in the Color-Glass-Condensate (CGC) approach. We show that the cross-section of the DPS in the CGC approach is calculable in terms of new nonperturbative objects, generalized double transverse momentum-dependent parton distribution (2GTMD) functions. We investigate the production of pairs of prompt photons from two partons in the projectile hadron in high-energy proton-nucleus collisions. We show that even for independent partons in the projectile, the prompt photon correlation function exhibits Hanbury Brown and Twiss (HBT) correlations. The width of the HBT peak is controlled by the transverse distance between the parton of the pair, which is of the order of the proton size. Thus, the HBT measurements in two-particle production such as prompt photon pairs provide useful information about the nonperturbative 2GTMDs. |
hep-ph/9801236 | Jake Lee | Jake Lee, S.Y. Choi and C.S. Kim (Yonsei Univ.) | T-Odd Gluon-Top-Quark Couplings at LHC | LaTeX 5 pages, talk given at the APCTP workshop: "Pacific Particle
Physics Phenomenology" (Oct 31--Nov 2, 1997) | null | null | YUMS 98-001, SNUTP 98-001 | hep-ph | null | The T-odd top-quark chromoelectric dipole moment, $d_t$, is probed through
top-quark-pair production via gluon fusion at the CERN LHC with the possibility
of having polarized proton beams in account. At 1-$\sigma$ level, the typical
CP-odd lepton energy and tensor correlations enable us to measure $Re(d_t)$ and
$Im(d_t)$ up to the order of 10$^{-18}$ ($g_scm$) in the unpolarized case and
the initial CP-odd gluon spin correlation allows us to probe $Im(d_t)$ up to
the order of 10$^{-20}$ ($g_scm$) for $\sqrt{s}=14$ TeV and the integrated
luminosity $L_{pp}=10 fb^{-1}$.
| [
{
"created": "Thu, 8 Jan 1998 02:42:51 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Lee",
"Jake",
"",
"Yonsei Univ."
],
[
"Choi",
"S. Y.",
"",
"Yonsei Univ."
],
[
"Kim",
"C. S.",
"",
"Yonsei Univ."
]
] | The T-odd top-quark chromoelectric dipole moment, $d_t$, is probed through top-quark-pair production via gluon fusion at the CERN LHC with the possibility of having polarized proton beams in account. At 1-$\sigma$ level, the typical CP-odd lepton energy and tensor correlations enable us to measure $Re(d_t)$ and $Im(d_t)$ up to the order of 10$^{-18}$ ($g_scm$) in the unpolarized case and the initial CP-odd gluon spin correlation allows us to probe $Im(d_t)$ up to the order of 10$^{-20}$ ($g_scm$) for $\sqrt{s}=14$ TeV and the integrated luminosity $L_{pp}=10 fb^{-1}$. |
2407.02479 | Bheemsehan Gurjar | Bhoomika Pandya, Bheemsehan Gurjar, Dipankar Chakrabarti, Ho-Meoyng
Choi and Chueng-Ryong Ji | Mixing effects on spectroscopy and partonic observables of mesons with
logarithmic confining potential in a light-front quark model | 20 pages, 9 figures | null | null | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Using the variational principle, we systematically investigate the mass
spectra and wave functions of both $1S$ and $2S$ state heavy pseudoscalar $(P)$
and vector $(V)$ mesons within the light-front quark model. This approach
incorporates a Coulomb plus logarithmic confinement potential to accurately
describe the constituent quark and antiquark dynamics. Additionally, spin
hyperfine interactions are introduced perturbatively to compute the masses of
pseudoscalar and vector mesons. The present analyses of the $1S$ and $2S$
states require the consideration of mixing between them to account for
empirical constraints. These constraints include the mass gap $\Delta M_{P} >
\Delta M_{V}$, where $\Delta M_{P(V)} = M^{2S}_{P(V)} - M^{1S}_{P(V)}$ and the
hierarchy of the decay constants $f_{1S} > f_{2S}$. We find the optimal value
of the mixing angle to be $\theta = 18^{\circ}$, significantly enhancing the
consistency between our spectroscopic predictions and the experimental data
compiled by the Particle Data Group (PDG). Furthermore, based on the predicted
mass, the newly observed resonance $B_J(5840)$ could be assigned as a $2^1S_0$
state in the $B$ meson family. The study also reports various pertinent
observables, including twist-2 distribution amplitudes, electromagnetic form
factors, charge radii, $\xi$ moments, and transition form factors which are
found to be consistent with both available lattice simulations and experimental
data. In addition, our predicted branching ratios for the channels of $B^+
\rightarrow \tau^+ \nu_{\tau}$ as well as rare decays of $B^0$ and $B_s^0$
appear in accordance with experimental data.
| [
{
"created": "Tue, 2 Jul 2024 17:56:38 GMT",
"version": "v1"
}
] | 2024-07-03 | [
[
"Pandya",
"Bhoomika",
""
],
[
"Gurjar",
"Bheemsehan",
""
],
[
"Chakrabarti",
"Dipankar",
""
],
[
"Choi",
"Ho-Meoyng",
""
],
[
"Ji",
"Chueng-Ryong",
""
]
] | Using the variational principle, we systematically investigate the mass spectra and wave functions of both $1S$ and $2S$ state heavy pseudoscalar $(P)$ and vector $(V)$ mesons within the light-front quark model. This approach incorporates a Coulomb plus logarithmic confinement potential to accurately describe the constituent quark and antiquark dynamics. Additionally, spin hyperfine interactions are introduced perturbatively to compute the masses of pseudoscalar and vector mesons. The present analyses of the $1S$ and $2S$ states require the consideration of mixing between them to account for empirical constraints. These constraints include the mass gap $\Delta M_{P} > \Delta M_{V}$, where $\Delta M_{P(V)} = M^{2S}_{P(V)} - M^{1S}_{P(V)}$ and the hierarchy of the decay constants $f_{1S} > f_{2S}$. We find the optimal value of the mixing angle to be $\theta = 18^{\circ}$, significantly enhancing the consistency between our spectroscopic predictions and the experimental data compiled by the Particle Data Group (PDG). Furthermore, based on the predicted mass, the newly observed resonance $B_J(5840)$ could be assigned as a $2^1S_0$ state in the $B$ meson family. The study also reports various pertinent observables, including twist-2 distribution amplitudes, electromagnetic form factors, charge radii, $\xi$ moments, and transition form factors which are found to be consistent with both available lattice simulations and experimental data. In addition, our predicted branching ratios for the channels of $B^+ \rightarrow \tau^+ \nu_{\tau}$ as well as rare decays of $B^0$ and $B_s^0$ appear in accordance with experimental data. |
1403.7191 | Ayres Freitas | C. Englert, A. Freitas, M. Muhlleitner, T. Plehn, M. Rauch, M. Spira,
K. Walz | Precision Measurements of Higgs Couplings: Implications for New Physics
Scales | Invited review for Journal of Physics G, 33pp; v2: references added
and improved discussion of operator basis in section 2.1 | J. Phys. G 41 (2014) 113001 | 10.1088/0954-3899/41/11/113001 | PSI-PR-14-01, KA-TP-06-2014, SFB/CPP-14-13 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The measured properties of the recently discovered Higgs boson are in good
agreement with predictions from the Standard Model. However, small deviations
in the Higgs couplings may manifest themselves once the currently large
uncertainties will be improved as part of the LHC program and at a future Higgs
factory. We review typical new physics scenarios that lead to observable
modifications of the Higgs interactions. They can be divided into two broad
categories: mixing effects as in portal models or extended Higgs sectors, and
vertex loop effects from new matter or gauge fields. In each model we relate
coupling deviations to their effective new physics scale. It turns out that
with percent level precision the Higgs couplings will be sensitive to the
multi-TeV regime.
| [
{
"created": "Thu, 27 Mar 2014 19:54:50 GMT",
"version": "v1"
},
{
"created": "Thu, 24 Apr 2014 17:49:33 GMT",
"version": "v2"
}
] | 2014-09-10 | [
[
"Englert",
"C.",
""
],
[
"Freitas",
"A.",
""
],
[
"Muhlleitner",
"M.",
""
],
[
"Plehn",
"T.",
""
],
[
"Rauch",
"M.",
""
],
[
"Spira",
"M.",
""
],
[
"Walz",
"K.",
""
]
] | The measured properties of the recently discovered Higgs boson are in good agreement with predictions from the Standard Model. However, small deviations in the Higgs couplings may manifest themselves once the currently large uncertainties will be improved as part of the LHC program and at a future Higgs factory. We review typical new physics scenarios that lead to observable modifications of the Higgs interactions. They can be divided into two broad categories: mixing effects as in portal models or extended Higgs sectors, and vertex loop effects from new matter or gauge fields. In each model we relate coupling deviations to their effective new physics scale. It turns out that with percent level precision the Higgs couplings will be sensitive to the multi-TeV regime. |
hep-ph/0208174 | Egle Tomasi-Gustafsson | Michail P. Rekalo and Egle Tomasi-Gustafsson | Determination of the $g_{\rho\sigma\gamma}$ coupling constant through
the process $\gamma+N\to N+V$ with circularly polarized photons | 8 pages, 3 figures | Nucl.Phys. A714 (2003) 632-640 | 10.1016/S0375-9474(02)01403-3 | null | hep-ph | null | We suggest a method to determine the product of the coupling constants
$g_{\rho\sigma\gamma}g_ {\sigma NN}$, in absolute value and relative sign,
through the $t$-dependence of the two possible T-even asymmetries for the
photoproduction of vector mesons, $\gamma+p\to p+V^0$, $V^0=\rho$ or $\omega$,
in the collision of circularly polarized photons with a polarized proton
target. In the framework of a $\pi+\sigma$-model, these asymmetries are very
sensitive to the relative role of $\pi$- and $\sigma$-exchanges, in the near
threshold region.
| [
{
"created": "Mon, 19 Aug 2002 15:00:39 GMT",
"version": "v1"
}
] | 2009-11-07 | [
[
"Rekalo",
"Michail P.",
""
],
[
"Tomasi-Gustafsson",
"Egle",
""
]
] | We suggest a method to determine the product of the coupling constants $g_{\rho\sigma\gamma}g_ {\sigma NN}$, in absolute value and relative sign, through the $t$-dependence of the two possible T-even asymmetries for the photoproduction of vector mesons, $\gamma+p\to p+V^0$, $V^0=\rho$ or $\omega$, in the collision of circularly polarized photons with a polarized proton target. In the framework of a $\pi+\sigma$-model, these asymmetries are very sensitive to the relative role of $\pi$- and $\sigma$-exchanges, in the near threshold region. |
1906.09080 | Ke-Sheng Sun | Ke-Sheng Sun, Jian-Bin Chen, Hai-Bin Zhang, Sheng-Kai Cui | $l_{\alpha}\rightarrow 3l_{\beta}$ in Minimal R-symmetric Supersymmetric
Standard Model | 16 pages,6 figures | null | 10.1142/S0217732319503590 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Lepton flavor violation decays are channels which may lead to fundamental
discoveries in the forthcoming years and this make it an exciting research
field for beyond the Standard Model searches. In this work, we present an
analysis of the lepton flavor violation decays $l_{\alpha}\rightarrow
3l_{\beta}$ in Minimal R-symmetric Supersymmetric Standard Model. The
prediction for BR($l_{\alpha}\rightarrow 3l_{\beta}$) depend on the
off-diagonal entries of the slepton mass matrix. The contributions to Wilson
coefficients can be classified into Higgs penguins, photon penguins, Z
penguins, and box diagrams. It shows the contribution from Z penguins dominates
the predictions for BR($l_{\alpha}\rightarrow 3l_{\beta}$), and the
contributions from Higgs penguins and box diagrams play different roles in
different decay channels. The theoretical predictions for
BR($l_{\alpha}\rightarrow 3l_{\beta}$) can reach the future experimental
limits, and there channels are very promising to be observed in near future
experiment.
| [
{
"created": "Fri, 21 Jun 2019 11:39:16 GMT",
"version": "v1"
},
{
"created": "Thu, 15 Aug 2019 15:57:44 GMT",
"version": "v2"
}
] | 2020-02-26 | [
[
"Sun",
"Ke-Sheng",
""
],
[
"Chen",
"Jian-Bin",
""
],
[
"Zhang",
"Hai-Bin",
""
],
[
"Cui",
"Sheng-Kai",
""
]
] | Lepton flavor violation decays are channels which may lead to fundamental discoveries in the forthcoming years and this make it an exciting research field for beyond the Standard Model searches. In this work, we present an analysis of the lepton flavor violation decays $l_{\alpha}\rightarrow 3l_{\beta}$ in Minimal R-symmetric Supersymmetric Standard Model. The prediction for BR($l_{\alpha}\rightarrow 3l_{\beta}$) depend on the off-diagonal entries of the slepton mass matrix. The contributions to Wilson coefficients can be classified into Higgs penguins, photon penguins, Z penguins, and box diagrams. It shows the contribution from Z penguins dominates the predictions for BR($l_{\alpha}\rightarrow 3l_{\beta}$), and the contributions from Higgs penguins and box diagrams play different roles in different decay channels. The theoretical predictions for BR($l_{\alpha}\rightarrow 3l_{\beta}$) can reach the future experimental limits, and there channels are very promising to be observed in near future experiment. |
1906.08007 | Valentin Tenorth | Florian Goertz, Karla Tame-Narvaez, and Valentin Tenorth | Di-jet/$e^+e^-$+ MET to Probe $Z_2-$Odd Mediators to the Dark Sector | 8 pages, 7 figures | null | 10.1140/epjc/s10052-019-7374-3 | null | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We explore a scenario where Dark Matter (DM) couples to the Standard Model
mainly via a scalar mediator ${\cal S}$ that is odd under a $Z_2$ symmetry,
leading to interesting collider signatures. In fact, if linear interactions
with the mediator are absent the most important DM production mechanisms at
colliders could lead to final states with missing transverse energy (MET) in
association with at least two fermions, such as di-jet or di-electron
signatures. The framework we consider is model-independent, in a sense that it
is only based on symmetry and formulated in the (extended) DM Effective Field
Theory (eDMEFT) approach. Moreover, it allows to address the smallness of
first-generation fermion masses via suppressed $Z_2$ breaking effects. From a
di-jet +MET analysis at the LHC, we find rather loose bounds on the effective
${\cal S}$-${\cal S}$-DM-DM interactions, unless the mediator couples very
strongly to SM fermions, while a future $e^+ e^-$ collider, such as CLIC, could
deliver tighter constraints on the corresponding model parameters, given the
mediator is leptophilic. We finally highlight the parameter space that allows
to produce the observed DM density, including constraints from direct-detection
experiments.
| [
{
"created": "Wed, 19 Jun 2019 10:03:02 GMT",
"version": "v1"
},
{
"created": "Tue, 2 Jul 2019 12:52:20 GMT",
"version": "v2"
}
] | 2020-01-08 | [
[
"Goertz",
"Florian",
""
],
[
"Tame-Narvaez",
"Karla",
""
],
[
"Tenorth",
"Valentin",
""
]
] | We explore a scenario where Dark Matter (DM) couples to the Standard Model mainly via a scalar mediator ${\cal S}$ that is odd under a $Z_2$ symmetry, leading to interesting collider signatures. In fact, if linear interactions with the mediator are absent the most important DM production mechanisms at colliders could lead to final states with missing transverse energy (MET) in association with at least two fermions, such as di-jet or di-electron signatures. The framework we consider is model-independent, in a sense that it is only based on symmetry and formulated in the (extended) DM Effective Field Theory (eDMEFT) approach. Moreover, it allows to address the smallness of first-generation fermion masses via suppressed $Z_2$ breaking effects. From a di-jet +MET analysis at the LHC, we find rather loose bounds on the effective ${\cal S}$-${\cal S}$-DM-DM interactions, unless the mediator couples very strongly to SM fermions, while a future $e^+ e^-$ collider, such as CLIC, could deliver tighter constraints on the corresponding model parameters, given the mediator is leptophilic. We finally highlight the parameter space that allows to produce the observed DM density, including constraints from direct-detection experiments. |
hep-ph/0402187 | Aurelien Barrau | A. Barrau, N. Ponthieu | Could the next generation of cosmology experiments exclude supergravity? | 8 pages, 5 figures, published version with minor changes, results
unchanged | Phys.Rev. D69 (2004) 105021 | 10.1103/PhysRevD.69.105021 | null | hep-ph astro-ph gr-qc hep-ex | null | Gravitinos are expected to be produced in any local supersymmetric model.
Using their abundance prediction as a function of the reheating energy scale,
it is argued that the next generation of Cosmic Microwave Background
experiments could exclude supergravity or strongly favor "thermal-like"
inflation models if B mode polarized radiation were detected. Galactic
cosmic--ray production by evaporating primordial black holes is also
investigated as a way of constraining the Hubble mass at the end of inflation.
Subsequent limits on the gravitino mass and on the related grand unification
parameters are derived.
| [
{
"created": "Wed, 18 Feb 2004 14:28:18 GMT",
"version": "v1"
},
{
"created": "Fri, 11 Jun 2004 12:08:22 GMT",
"version": "v2"
}
] | 2009-11-10 | [
[
"Barrau",
"A.",
""
],
[
"Ponthieu",
"N.",
""
]
] | Gravitinos are expected to be produced in any local supersymmetric model. Using their abundance prediction as a function of the reheating energy scale, it is argued that the next generation of Cosmic Microwave Background experiments could exclude supergravity or strongly favor "thermal-like" inflation models if B mode polarized radiation were detected. Galactic cosmic--ray production by evaporating primordial black holes is also investigated as a way of constraining the Hubble mass at the end of inflation. Subsequent limits on the gravitino mass and on the related grand unification parameters are derived. |
0805.2916 | Miguel Sanchis | Juan-Luis Domenech-Garret and Miguel-Angel Sanchis-Lozano | Spectroscopy, leptonic decays and the nature of heavy quarkonia | 8 pages | Phys.Lett.B669:52-57,2008 | 10.1016/j.physletb.2008.09.021 | IFIC-08-26, FTUV/08-0519 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We examine the electronic width ratios of Upsilon resonances below the BBbar
threshold by means of an effective (Cornell-type) QCD potential incorporating
1/m_b corrections obtained from a prior fit to the bottomonium spectrum. From
our analysis we conclude that the Upsilon(2S) and Upsilon(3S) states should
belong to the strong-coupling (nonperturbative) regime while the Upsilon(1S)
state should belong to the weak-coupling (perturbative) regime, in agreement
with a previous study based on radiative decays.
| [
{
"created": "Mon, 19 May 2008 19:22:16 GMT",
"version": "v1"
},
{
"created": "Wed, 21 May 2008 07:22:45 GMT",
"version": "v2"
},
{
"created": "Sun, 14 Sep 2008 15:03:15 GMT",
"version": "v3"
}
] | 2008-11-26 | [
[
"Domenech-Garret",
"Juan-Luis",
""
],
[
"Sanchis-Lozano",
"Miguel-Angel",
""
]
] | We examine the electronic width ratios of Upsilon resonances below the BBbar threshold by means of an effective (Cornell-type) QCD potential incorporating 1/m_b corrections obtained from a prior fit to the bottomonium spectrum. From our analysis we conclude that the Upsilon(2S) and Upsilon(3S) states should belong to the strong-coupling (nonperturbative) regime while the Upsilon(1S) state should belong to the weak-coupling (perturbative) regime, in agreement with a previous study based on radiative decays. |
1610.06291 | Lobsang Dhargyal | Lobsang Dhargyal | Explaining the observed deviation in R($D^{(*)}$) in an anomalous 2HDM | Matches with the accepted for publication as a chapter in Springer
Proceedings Phys., Vol. 203, Md. Naimuddin(Ed): XXII Dae High Energy Physics
Symposium, 978-3-319-73170-4, 438349_1_En (161). For more details see
previous version and references there in | null | null | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The reported combined excess of about 4$\sigma$, by BABAR, Belle and LHCb, in
the measurements of R($D^{(*)}$) and Br(B $\rightarrow \tau \nu_{\tau}$) from
that of the standard model expectation constitute the most significant
discrepancy from the standard model in collider experiments thus far(apart from
the non zero neutrino masses). Here we analyze the phenomenological
implications for these decay modes in a Flipped/Lepton-Specific
two-Higg-doublet model with anomalously enhanced charged Higgs coupling to
$\tau$/b. We conclude that this extension of the standard model can give
results in agreement within 1$\sigma$ of the experimental values for the
combination of R($D^{(*)}$) and Br(B $\rightarrow \tau \nu_{\tau}$) data.
| [
{
"created": "Thu, 20 Oct 2016 05:28:27 GMT",
"version": "v1"
},
{
"created": "Fri, 11 May 2018 16:12:13 GMT",
"version": "v2"
}
] | 2018-05-14 | [
[
"Dhargyal",
"Lobsang",
""
]
] | The reported combined excess of about 4$\sigma$, by BABAR, Belle and LHCb, in the measurements of R($D^{(*)}$) and Br(B $\rightarrow \tau \nu_{\tau}$) from that of the standard model expectation constitute the most significant discrepancy from the standard model in collider experiments thus far(apart from the non zero neutrino masses). Here we analyze the phenomenological implications for these decay modes in a Flipped/Lepton-Specific two-Higg-doublet model with anomalously enhanced charged Higgs coupling to $\tau$/b. We conclude that this extension of the standard model can give results in agreement within 1$\sigma$ of the experimental values for the combination of R($D^{(*)}$) and Br(B $\rightarrow \tau \nu_{\tau}$) data. |
hep-ph/0206061 | Xiao-Gang He | X.-G. He (NTU), C.-P. Kao (NTU), J.P. Ma (ITP) and S. Pakvasa (Hawaii) | $\bar B^0 \to \pi^+ X$ in the Standard Model | RevTex 8 pages and two figures | Phys.Rev.D66:097501,2002 | 10.1103/PhysRevD.66.097501 | null | hep-ph hep-ex | null | In this paper we investigate the possibility of studying $B\to \pi$ form
factor using the semi-inclusive decays $\bar B^0 \to \pi^+ + X_q$. In general
$B\to PX$ semi-inclusive decays involve several hadronic parameters. But for
$\bar B^0 \to \pi^+ X_q$ decays we find that in the factorization
approximation, the only unknown hadronic parameters are the form factors
$F^{B\to \pi}_{0,1}$. Therefore these form factors can be studied in $\bar B^0
\to \pi^+ X_q$ decays. Using theoretical model calculations for the form
factors the branching ratios for $\bar B^0 \to \pi^+ X_d(\Delta S = 0) $ and
$\bar B^0 \to \pi^+ X_s (\Delta S = -1)$, with the cut $E_{\pi} > 2.1$ GeV, are
estimated to be in the ranges of $(3.1\sim 4.9) \times 10^{-5}(F^{B\to
\pi}_1(0)/0.33)^2$ and $(2.5\sim 4.2)\times 10^{-5}(F_1^{B\to \pi}(0)/0.33)^2$,
respectively, depending on the value of $\gamma$. The combined branching ratio
for $\bar B^0 \to \pi^+ (X_d+ X_s)$ is about $7.4\times 10^{-5} (F^{B\to
\pi}_1(0)/0.33)^2$ and is insensitive to $\gamma$. We also discuss CP
asymmetries in these decay modes.
| [
{
"created": "Thu, 6 Jun 2002 06:29:39 GMT",
"version": "v1"
},
{
"created": "Sun, 9 Jun 2002 09:40:08 GMT",
"version": "v2"
}
] | 2011-07-19 | [
[
"He",
"X. -G.",
"",
"NTU"
],
[
"Kao",
"C. -P.",
"",
"NTU"
],
[
"Ma",
"J. P.",
"",
"ITP"
],
[
"Pakvasa",
"S.",
"",
"Hawaii"
]
] | In this paper we investigate the possibility of studying $B\to \pi$ form factor using the semi-inclusive decays $\bar B^0 \to \pi^+ + X_q$. In general $B\to PX$ semi-inclusive decays involve several hadronic parameters. But for $\bar B^0 \to \pi^+ X_q$ decays we find that in the factorization approximation, the only unknown hadronic parameters are the form factors $F^{B\to \pi}_{0,1}$. Therefore these form factors can be studied in $\bar B^0 \to \pi^+ X_q$ decays. Using theoretical model calculations for the form factors the branching ratios for $\bar B^0 \to \pi^+ X_d(\Delta S = 0) $ and $\bar B^0 \to \pi^+ X_s (\Delta S = -1)$, with the cut $E_{\pi} > 2.1$ GeV, are estimated to be in the ranges of $(3.1\sim 4.9) \times 10^{-5}(F^{B\to \pi}_1(0)/0.33)^2$ and $(2.5\sim 4.2)\times 10^{-5}(F_1^{B\to \pi}(0)/0.33)^2$, respectively, depending on the value of $\gamma$. The combined branching ratio for $\bar B^0 \to \pi^+ (X_d+ X_s)$ is about $7.4\times 10^{-5} (F^{B\to \pi}_1(0)/0.33)^2$ and is insensitive to $\gamma$. We also discuss CP asymmetries in these decay modes. |
1306.1095 | Gauhar Abbas | Gauhar Abbas, B. Ananthanarayan, I. Caprini | Determination of the strong coupling from hadronic tau decays using
renormalization group summed perturbation theory | Contribution to the proceedings of the workshop "Determination of the
Fundamental Parameters of QCD", Nanyang Technological University, Singapore,
18-22 March 2013, to be published in Mod. Phys. Lett. A, version 2 contains
an extra footnote and a reference compared to version 1 | null | 10.1142/S0217732313600043 | null | hep-ph | http://creativecommons.org/licenses/publicdomain/ | We determine the strong coupling constant \alpha_s from the \tau hadroni
width using a renormalization group summed (RGS) expansion of the QCD Adler
function. The main theoretical uncertainty in the extraction of \alpha_s is due
to the manner in which renormalization group invariance is implemented, and the
as yet uncalculated higher order terms in the QCD perturbative series. We show
that new expansion exhibits good renormalization group improvement and the
behaviour of the series is similar to that of the standard CIPT expansion. The
value of the strong coupling in {\bar{\rm MS}} scheme obtained with the RGS
expansion is \alpha_s(M_\tau^2)= 0.338 \pm 0.010. The convergence properties of
the new expansion can be improved by Borel transformation and analytic
continuation in the Borel plane. This is discussed elsewhere in these
proceedings.
| [
{
"created": "Wed, 5 Jun 2013 13:07:33 GMT",
"version": "v1"
},
{
"created": "Wed, 12 Jun 2013 14:12:03 GMT",
"version": "v2"
}
] | 2015-06-16 | [
[
"Abbas",
"Gauhar",
""
],
[
"Ananthanarayan",
"B.",
""
],
[
"Caprini",
"I.",
""
]
] | We determine the strong coupling constant \alpha_s from the \tau hadroni width using a renormalization group summed (RGS) expansion of the QCD Adler function. The main theoretical uncertainty in the extraction of \alpha_s is due to the manner in which renormalization group invariance is implemented, and the as yet uncalculated higher order terms in the QCD perturbative series. We show that new expansion exhibits good renormalization group improvement and the behaviour of the series is similar to that of the standard CIPT expansion. The value of the strong coupling in {\bar{\rm MS}} scheme obtained with the RGS expansion is \alpha_s(M_\tau^2)= 0.338 \pm 0.010. The convergence properties of the new expansion can be improved by Borel transformation and analytic continuation in the Borel plane. This is discussed elsewhere in these proceedings. |
1504.04006 | Christopher Lee | Daekyoung Kang, Ou Z. Labun, Christopher Lee | Equality of hemisphere soft functions for $e^+e^-$, DIS and $pp$
collisions at $\mathcal{O}(\alpha_s^2)$ | 10 pages, 3 figures, uses elsarticle.cls. v2: several clarifications
and references added. v3: references added, minor edits, Fig. B.1 improved,
version published in PLB. v4,v5: minor typos and constant terms in soft
function in Appendix A corrected | Phys. Lett. B 748, 45-54 (2015) | null | LA-UR-15-22720 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present a simple observation about soft amplitudes and soft functions
appearing in factorizable cross sections in $ee$, $ep$, and $pp$ collisions
that has not clearly been made in previous literature, namely, that the
hemisphere soft functions that appear in event shape distributions in
$e^+e^-\to$ dijets, deep inelastic scattering (DIS), and in Drell-Yan (DY)
processes are equal in perturbation theory up to $\mathcal{O}(\alpha_s^2)$,
even though individual amplitudes may have opposite sign imaginary parts due to
changing complex pole prescriptions in eikonal propagators for incoming vs.
outgoing lines. We also explore potential generalizations of this observation
to soft functions for other observables or with more jets in the final state.
| [
{
"created": "Wed, 15 Apr 2015 19:58:51 GMT",
"version": "v1"
},
{
"created": "Thu, 14 May 2015 17:48:50 GMT",
"version": "v2"
},
{
"created": "Fri, 3 Jul 2015 17:27:36 GMT",
"version": "v3"
},
{
"created": "Mon, 8 May 2017 19:35:33 GMT",
"version": "v4"
},
{
"created": "Thu, 10 Aug 2017 16:50:42 GMT",
"version": "v5"
}
] | 2017-08-11 | [
[
"Kang",
"Daekyoung",
""
],
[
"Labun",
"Ou Z.",
""
],
[
"Lee",
"Christopher",
""
]
] | We present a simple observation about soft amplitudes and soft functions appearing in factorizable cross sections in $ee$, $ep$, and $pp$ collisions that has not clearly been made in previous literature, namely, that the hemisphere soft functions that appear in event shape distributions in $e^+e^-\to$ dijets, deep inelastic scattering (DIS), and in Drell-Yan (DY) processes are equal in perturbation theory up to $\mathcal{O}(\alpha_s^2)$, even though individual amplitudes may have opposite sign imaginary parts due to changing complex pole prescriptions in eikonal propagators for incoming vs. outgoing lines. We also explore potential generalizations of this observation to soft functions for other observables or with more jets in the final state. |
1009.1969 | Ignasi Rosell | Ignasi Rosell | Revisiting the vector form factor at next-to-leading order in 1/N(C) | Talk given at the 15th International QCD Conference, 28th June-3d
July (2010), Montpellier (France) | Nucl.Phys.Proc.Suppl.207-208:163-166,2010 | 10.1016/j.nuclphysbps.2010.10.042 | IFIC/10-31 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Using the Resonance Chiral Theory lagrangian, we perform a calculation of the
vector form factor of the pion at the next-to-leading order (NLO) in the
$1/N_C$ expansion. Imposing the correct QCD short-distance constraints, one
determines it in terms of $F$, $G_V$, $F_A$ and resonance masses. Its low
momentum expansion fixes then the low-energy chiral couplings $L_{9}$ and
$C_{88}-C_{90}$ at NLO, keeping full control of their renormalization scale
dependence. At $\mu_0=0.77$ GeV, we obtain $L_{9}^r(\mu_0) = (7.6 \pm 0.6)\cdot
10^{-3}$ and $C_{88}^r(\mu_0)-C_{90}^r(\mu_0)=(-4.5 \pm 0.5)\cdot 10^{-5}$.
| [
{
"created": "Fri, 10 Sep 2010 09:49:34 GMT",
"version": "v1"
}
] | 2011-02-15 | [
[
"Rosell",
"Ignasi",
""
]
] | Using the Resonance Chiral Theory lagrangian, we perform a calculation of the vector form factor of the pion at the next-to-leading order (NLO) in the $1/N_C$ expansion. Imposing the correct QCD short-distance constraints, one determines it in terms of $F$, $G_V$, $F_A$ and resonance masses. Its low momentum expansion fixes then the low-energy chiral couplings $L_{9}$ and $C_{88}-C_{90}$ at NLO, keeping full control of their renormalization scale dependence. At $\mu_0=0.77$ GeV, we obtain $L_{9}^r(\mu_0) = (7.6 \pm 0.6)\cdot 10^{-3}$ and $C_{88}^r(\mu_0)-C_{90}^r(\mu_0)=(-4.5 \pm 0.5)\cdot 10^{-5}$. |
1207.2594 | Daijiro Suematsu | Shoichi Kashiwase and Daijiro Suematsu | Baryon number asymmetry and dark matter in the neutrino mass model with
an inert doublet | 26 pages, 5 figures, Fig.1 replaced, typos corrected, references
updated, published version in PRD | Phys. Rev. D 86, 053001 (2012) | 10.1103/PhysRevD.86.053001 | KANAZAWA-12-06 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The radiative neutrino mass model with an inert doublet scalar has been
considered as a promising candidate which can explain neutrino masses, dark
matter abundance and baryon number asymmetry if dark matter is identified with
the lightest neutral component of the inert doublet. We reexamine these
properties by imposing all the data of the neutrino oscillation, which are
recently suggested by the reactor experiments. We find that the sufficient
baryon number asymmetry seems not to be easily generated in a consistent way
with all the data of the neutrino masses and mixing as long as the right-handed
neutrinos are kept in TeV regions. Two possible modifications of the model are
examined.
| [
{
"created": "Wed, 11 Jul 2012 11:04:36 GMT",
"version": "v1"
},
{
"created": "Sat, 22 Sep 2012 02:57:42 GMT",
"version": "v2"
}
] | 2015-06-05 | [
[
"Kashiwase",
"Shoichi",
""
],
[
"Suematsu",
"Daijiro",
""
]
] | The radiative neutrino mass model with an inert doublet scalar has been considered as a promising candidate which can explain neutrino masses, dark matter abundance and baryon number asymmetry if dark matter is identified with the lightest neutral component of the inert doublet. We reexamine these properties by imposing all the data of the neutrino oscillation, which are recently suggested by the reactor experiments. We find that the sufficient baryon number asymmetry seems not to be easily generated in a consistent way with all the data of the neutrino masses and mixing as long as the right-handed neutrinos are kept in TeV regions. Two possible modifications of the model are examined. |
1207.1967 | H. B. Benaoum | H. B. Benaoum | Non-zero $\theta_{13}$ from the Triangular Ansatz and Leptogenesis | 12 pages, 6 figures, corrected typos | Mod.Phys.Lett. A27 (2012) 1250151 | 10.1142/S0217732312501519 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Recent experiments indicate a departure from the exact Tri-Bimaximal mixing
by measuring definitive non-zero value of $\theta_{13}$. Within the framework
of type I seesaw mechanism, we reconstruct the triangular Dirac neutrino mass
matrix from the $\mu-\tau$ symmetric mass matrix. The deviation from $\mu-\tau$
symmetry is then parametrized by adding dimensionless parameters $y_i$ in the
triangular mass matrix. In this parametrization of the neutrino mass matrix,
the non-zero value $\theta_{13}$ is controlled by $\Delta y = y_4 - y_6$. We
also calculate the resulting leptogenesis and show that the triangular texture
can generate the observed baryon asymmetry in the universe via leptogenesis
scenario.
| [
{
"created": "Mon, 9 Jul 2012 06:58:46 GMT",
"version": "v1"
},
{
"created": "Sun, 4 Nov 2012 19:31:42 GMT",
"version": "v2"
}
] | 2012-11-06 | [
[
"Benaoum",
"H. B.",
""
]
] | Recent experiments indicate a departure from the exact Tri-Bimaximal mixing by measuring definitive non-zero value of $\theta_{13}$. Within the framework of type I seesaw mechanism, we reconstruct the triangular Dirac neutrino mass matrix from the $\mu-\tau$ symmetric mass matrix. The deviation from $\mu-\tau$ symmetry is then parametrized by adding dimensionless parameters $y_i$ in the triangular mass matrix. In this parametrization of the neutrino mass matrix, the non-zero value $\theta_{13}$ is controlled by $\Delta y = y_4 - y_6$. We also calculate the resulting leptogenesis and show that the triangular texture can generate the observed baryon asymmetry in the universe via leptogenesis scenario. |
hep-ph/0306212 | Matteo Cacciari | Matteo Cacciari and Paolo Nason | Charm Cross Sections for the Tevatron Run II | 11 pages, 5 figures, LaTeX | JHEP 0309 (2003) 006 | 10.1088/1126-6708/2003/09/006 | UPRF-2003-10, Bicocca-FT-03-14 | hep-ph hep-ex | null | We present a calculation of the D^{*+}, D^+ and D^0 meson single inclusive
production cross section for the Tevatron Run II. We use the FONLL approach in
perturbative QCD, which, besides including the known next-to-leading order
corrections, also provides for the resummation at the next-to-leading
logarithmic level of terms enhanced at large p_T by powers of log(p_T/m), where
m is the charm mass and p_T is its transverse momentum. Non-perturbative
effects in charm hadronization are extracted, in moment space, from recent
ALEPH data for D^* fragmentation in e^+e^- collisions.
| [
{
"created": "Mon, 23 Jun 2003 12:53:52 GMT",
"version": "v1"
}
] | 2009-11-10 | [
[
"Cacciari",
"Matteo",
""
],
[
"Nason",
"Paolo",
""
]
] | We present a calculation of the D^{*+}, D^+ and D^0 meson single inclusive production cross section for the Tevatron Run II. We use the FONLL approach in perturbative QCD, which, besides including the known next-to-leading order corrections, also provides for the resummation at the next-to-leading logarithmic level of terms enhanced at large p_T by powers of log(p_T/m), where m is the charm mass and p_T is its transverse momentum. Non-perturbative effects in charm hadronization are extracted, in moment space, from recent ALEPH data for D^* fragmentation in e^+e^- collisions. |
hep-ph/9809408 | Michael Ogilvie | Andy Gopie and Michael C. Ogilvie | Monte Carlo Estimate of Finite Size Effects in Quark-Gluon Plasma
Formation | 4 pages, RevTex, poster presented at the 5th International Workshop
on Thermal Field Theories, Regensburg, Germany | null | null | null | hep-ph | null | Using lattice simulations of quenched QCD we estimate the finite size effects
present when a gluon plasma equilibrates in a slab geometry, i.e., finite width
but large transverse dimensions. Significant differences are observed in the
free energy density for the slab when compared with bulk behavior. A small
shift in the critical temperature is also seen. The free energy required to
liberate heavy quarks relative to bulk is measured using Polyakov loops; the
additional free energy required is on the order of 30-40 MeV at 2-3 T_c.
| [
{
"created": "Tue, 15 Sep 1998 22:40:23 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Gopie",
"Andy",
""
],
[
"Ogilvie",
"Michael C.",
""
]
] | Using lattice simulations of quenched QCD we estimate the finite size effects present when a gluon plasma equilibrates in a slab geometry, i.e., finite width but large transverse dimensions. Significant differences are observed in the free energy density for the slab when compared with bulk behavior. A small shift in the critical temperature is also seen. The free energy required to liberate heavy quarks relative to bulk is measured using Polyakov loops; the additional free energy required is on the order of 30-40 MeV at 2-3 T_c. |
2008.08107 | Bogdan Malaescu | Bogdan Malaescu and Matthias Schott | Impact of correlations between $a_\mu$ and $\alpha_{QED}$ on the EW fit | Added 4 references and some more detailed discussions. The results
and conclusions are unchanged. Version matching the published paper. 10
pages, 3 figures | null | 10.1140/epjc/s10052-021-08848-9 | null | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the potential impact on the electroweak (EW) fits due to the
tensions between the current determinations of the hadronic vacuum polarisation
(HVP) contributions to the anomalous magnetic moment of the muon ($a_\mu$),
based on either phenomenological dispersion integrals using measured hadronic
spectra or on Lattice QCD calculations. The impact of the current tension
between the experimental measurement of $a_\mu$ and the total theoretical
prediction based on the phenomenological calculations of the HVP are also
studied. The correlations between the uncertainties of the theoretical
predictions of $a_\mu$ and of the running of $\alpha_{QED}$ are taken into
account in the studies. We conclude that the impact on the EW fit can be large
in improbable scenarios involving global shifts of the full HVP contribution,
while it is much smaller if the shift is restricted to a lower mass range
and/or if the shift in $\alpha_{QED}$ is obtained from that in $a_\mu$ through
appropriate use of the correlations. Indeed, the latter scenarios only imply at
most a 2.6/16 increase in the $\chi^2/n.d.f.$ of the EW fits and relatively
small changes for the resulting fit parameter values.
| [
{
"created": "Tue, 18 Aug 2020 18:07:09 GMT",
"version": "v1"
},
{
"created": "Fri, 15 Jan 2021 14:41:04 GMT",
"version": "v2"
}
] | 2021-02-03 | [
[
"Malaescu",
"Bogdan",
""
],
[
"Schott",
"Matthias",
""
]
] | We study the potential impact on the electroweak (EW) fits due to the tensions between the current determinations of the hadronic vacuum polarisation (HVP) contributions to the anomalous magnetic moment of the muon ($a_\mu$), based on either phenomenological dispersion integrals using measured hadronic spectra or on Lattice QCD calculations. The impact of the current tension between the experimental measurement of $a_\mu$ and the total theoretical prediction based on the phenomenological calculations of the HVP are also studied. The correlations between the uncertainties of the theoretical predictions of $a_\mu$ and of the running of $\alpha_{QED}$ are taken into account in the studies. We conclude that the impact on the EW fit can be large in improbable scenarios involving global shifts of the full HVP contribution, while it is much smaller if the shift is restricted to a lower mass range and/or if the shift in $\alpha_{QED}$ is obtained from that in $a_\mu$ through appropriate use of the correlations. Indeed, the latter scenarios only imply at most a 2.6/16 increase in the $\chi^2/n.d.f.$ of the EW fits and relatively small changes for the resulting fit parameter values. |
1809.03881 | Fu-Hu Liu | Li-Li Li, Fu-Hu Liu | Energy dependent kinetic freeze-out temperature and transverse flow
velocity in high energy collisions | Updated version, 16 pages, 4 figures. Only the first component is
used to extract $T_0$ and $\beta_T$. Conclusions unchanged. arXiv admin note:
text overlap with arXiv:1805.03342 | The European Physical Journal A 54, 169 (2018) (16 pages) | 10.1140/epja/i2018-12606-3 | null | hep-ph hep-ex nucl-ex nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Transverse momentum spectra of negative and positive pions produced at
mid-(pseudo)rapidity in inelastic or non-single-diffractive proton-proton
collisions and in central nucleus-nucleus collisions over an energy range from
a few GeV to above 10 TeV are analyzed by a (two-component) blast-wave model
with Boltzmann-Gibbs statistics and with Tsallis statistics respectively. The
model results are in similarly well agreement with the experimental data
measured by a few productive collaborations who work at the Heavy Ion
Synchrotron (SIS), Super Proton Synchrotron (SPS), Relativistic Heavy Ion
Collider (RHIC), and Large Hadron Collider (LHC), respectively. The energy
dependent kinetic freeze-out temperature and transverse flow velocity are
obtained and analyzed. Both the quantities have quick increase from the SIS to
SPS, and slight increase or approximate invariability from the top RHIC to LHC.
Around the energy bridge from the SPS to RHIC, the considered quantities in
proton-proton collisions obtained by the blast-wave model with Boltzmann-Gibbs
statistics show more complex energy dependent behavior comparing with the
results in other three cases.
| [
{
"created": "Tue, 11 Sep 2018 13:38:43 GMT",
"version": "v1"
},
{
"created": "Sat, 25 Sep 2021 12:35:44 GMT",
"version": "v2"
}
] | 2021-09-28 | [
[
"Li",
"Li-Li",
""
],
[
"Liu",
"Fu-Hu",
""
]
] | Transverse momentum spectra of negative and positive pions produced at mid-(pseudo)rapidity in inelastic or non-single-diffractive proton-proton collisions and in central nucleus-nucleus collisions over an energy range from a few GeV to above 10 TeV are analyzed by a (two-component) blast-wave model with Boltzmann-Gibbs statistics and with Tsallis statistics respectively. The model results are in similarly well agreement with the experimental data measured by a few productive collaborations who work at the Heavy Ion Synchrotron (SIS), Super Proton Synchrotron (SPS), Relativistic Heavy Ion Collider (RHIC), and Large Hadron Collider (LHC), respectively. The energy dependent kinetic freeze-out temperature and transverse flow velocity are obtained and analyzed. Both the quantities have quick increase from the SIS to SPS, and slight increase or approximate invariability from the top RHIC to LHC. Around the energy bridge from the SPS to RHIC, the considered quantities in proton-proton collisions obtained by the blast-wave model with Boltzmann-Gibbs statistics show more complex energy dependent behavior comparing with the results in other three cases. |
1012.2952 | Matthew Sudano | Jason L. Evans, Matthew Sudano, Tsutomu T. Yanagida | Higgs Messengers | 20 pages, 5 figures | null | 10.1007/JHEP08(2011)142 | IPMU10-0218 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We explore the consequences of the Higgs fields acting as messengers of
supersymmetry breaking. The hidden-sector paradigm in the gauge mediation
framework is relaxed by allowing two types of gauge-invariant, renormalizable
operators that are typically discarded: direct coupling between the Higgses and
supersymmetry breaking singlets, and Higgs-messenger mixing terms. The most
important phenomenological consequence is a flavor-dependent shift in sfermion
masses. This is from a one-loop contribution, which we compute for a general
set of weak doublet messengers. We also study a couple of explicit models in
detail, finding that precision electroweak constraints can be satisfied with a
spectrum significantly different from that of gauge mediation.
| [
{
"created": "Tue, 14 Dec 2010 07:49:03 GMT",
"version": "v1"
},
{
"created": "Sat, 5 Mar 2011 09:57:06 GMT",
"version": "v2"
}
] | 2015-05-20 | [
[
"Evans",
"Jason L.",
""
],
[
"Sudano",
"Matthew",
""
],
[
"Yanagida",
"Tsutomu T.",
""
]
] | We explore the consequences of the Higgs fields acting as messengers of supersymmetry breaking. The hidden-sector paradigm in the gauge mediation framework is relaxed by allowing two types of gauge-invariant, renormalizable operators that are typically discarded: direct coupling between the Higgses and supersymmetry breaking singlets, and Higgs-messenger mixing terms. The most important phenomenological consequence is a flavor-dependent shift in sfermion masses. This is from a one-loop contribution, which we compute for a general set of weak doublet messengers. We also study a couple of explicit models in detail, finding that precision electroweak constraints can be satisfied with a spectrum significantly different from that of gauge mediation. |
1605.05845 | Zolt\'an Nagy | Zoltan Nagy and Davison E. Soper | Summing threshold logs in a parton shower | 83 pages, 8 figures | null | 10.1007/JHEP10(2016)019 | DESY 16-091 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | When parton distributions are falling steeply as the momentum fractions of
the partons increases, there are effects that occur at each order in $\alpha_s$
that combine to affect hard scattering cross sections and need to be summed. We
show how to accomplish this in a leading approximation in the context of a
parton shower Monte Carlo event generator.
| [
{
"created": "Thu, 19 May 2016 08:30:43 GMT",
"version": "v1"
},
{
"created": "Fri, 27 May 2016 10:18:49 GMT",
"version": "v2"
},
{
"created": "Tue, 27 Sep 2016 14:17:37 GMT",
"version": "v3"
}
] | 2016-11-03 | [
[
"Nagy",
"Zoltan",
""
],
[
"Soper",
"Davison E.",
""
]
] | When parton distributions are falling steeply as the momentum fractions of the partons increases, there are effects that occur at each order in $\alpha_s$ that combine to affect hard scattering cross sections and need to be summed. We show how to accomplish this in a leading approximation in the context of a parton shower Monte Carlo event generator. |
1809.05129 | Nabanita Ganguly | Amitava Datta, Nabanita Ganguly | The past, present and future of the heavier electroweakinos in the light
of LHC and other data | null | null | 10.1007/JHEP01(2019)103 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The aim of this paper is to showcase the novel multilepton ($nl +
E\!\!\!\!/_T$, n = 3 - 5) signals, hitherto unexplored at the LHC, arising from
the heavier electroweakinos, in several generic pMSSMs at the upcoming LHC
experiments. We first briefly review our old constraints on the full
electroweakino sector of these models, containing both lighter and heavier
sparticles, using the ATLAS trilepton data from the LHC Run I. Next we derive
new stronger constraints on this sector for the first time using the ATLAS Run
II data. We identify some benchmark points and explore the prospect of
observing multilepton events in future LHC experiments. Our focus is on the
channels with $n > 3$ which are the hallmarks of the heavier electroweakinos.
If the spectrum of the lighter electroweakinos is compressed, these signals
might very well be the discovery channels of the electroweakinos at the high
luminosity LHC. We also discuss the implications of the new LHC constraints for
the observed dark matter relic density of the universe, the measured value of
the anomalous magnetic moment of the muon and the dark matter direct detection
experiments.
| [
{
"created": "Thu, 13 Sep 2018 18:27:34 GMT",
"version": "v1"
},
{
"created": "Wed, 2 Jan 2019 07:18:56 GMT",
"version": "v2"
}
] | 2019-02-20 | [
[
"Datta",
"Amitava",
""
],
[
"Ganguly",
"Nabanita",
""
]
] | The aim of this paper is to showcase the novel multilepton ($nl + E\!\!\!\!/_T$, n = 3 - 5) signals, hitherto unexplored at the LHC, arising from the heavier electroweakinos, in several generic pMSSMs at the upcoming LHC experiments. We first briefly review our old constraints on the full electroweakino sector of these models, containing both lighter and heavier sparticles, using the ATLAS trilepton data from the LHC Run I. Next we derive new stronger constraints on this sector for the first time using the ATLAS Run II data. We identify some benchmark points and explore the prospect of observing multilepton events in future LHC experiments. Our focus is on the channels with $n > 3$ which are the hallmarks of the heavier electroweakinos. If the spectrum of the lighter electroweakinos is compressed, these signals might very well be the discovery channels of the electroweakinos at the high luminosity LHC. We also discuss the implications of the new LHC constraints for the observed dark matter relic density of the universe, the measured value of the anomalous magnetic moment of the muon and the dark matter direct detection experiments. |
1604.02141 | Igor Strakovsky | M. Albrow, M. Amaryan, E. Chudakov, P. Degtyarenko, A. Feijoo, C.
Fernandez-Ramirez, I.P. Fernando, A. Filippi, J.L. Goity, H. Haberzettl, B.C.
Jackson, H. Kamano, C. Keith, M. Kohl, I. Larin, Wei-Hong Liang, V.K. Magas,
M. Mai, D.M. Manley, V. Mathieu, F. Myhrer, K. Nakayama, H. Noumi, Y. Oh, H.
Ohnishi, E. Oset, M. Pennington, A. Ramos, D. Richards, E. Santopinto, R.
Schumacher, A. Szczepaniak, S. Taylor, B. Wojtsekhowski, Ju-Jun Xie, V.
Ziegler, and B. Zou | Workshop on Physics with Neutral Kaon Beam at JLab (KL2016)
Mini-Proceedings | 238 pages, Editors: M. Amaryan, E. Chudakov, C. Meyer, M. Pennington,
J. Ritman, and I. Strakovsky | null | null | null | hep-ph hep-ex nucl-ex nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The KL2016 Workshop is following the Letter of Intent LoI12-15-001 "Physics
Opportunities with Secondary KL beam at JLab" submitted to PAC43 with the main
focus on the physics of excited hyperons produced by the Kaon beam on
unpolarized and polarized targets with GlueX setup in Hall D. Such studies will
broaden a physics program of hadron spectroscopy extending it to the strange
sector. The Workshop was organized to get a feedback from the community to
strengthen physics motivation of the LoI and prepare a full proposal.
Further details about the Workshop can be found on the web page of the
conference: http://www.jlab.org/conferences/kl2016/index.html .
| [
{
"created": "Wed, 6 Apr 2016 20:58:05 GMT",
"version": "v1"
}
] | 2016-04-11 | [
[
"Albrow",
"M.",
""
],
[
"Amaryan",
"M.",
""
],
[
"Chudakov",
"E.",
""
],
[
"Degtyarenko",
"P.",
""
],
[
"Feijoo",
"A.",
""
],
[
"Fernandez-Ramirez",
"C.",
""
],
[
"Fernando",
"I. P.",
""
],
[
"Filippi",
"A.",
""
],
[
"Goity",
"J. L.",
""
],
[
"Haberzettl",
"H.",
""
],
[
"Jackson",
"B. C.",
""
],
[
"Kamano",
"H.",
""
],
[
"Keith",
"C.",
""
],
[
"Kohl",
"M.",
""
],
[
"Larin",
"I.",
""
],
[
"Liang",
"Wei-Hong",
""
],
[
"Magas",
"V. K.",
""
],
[
"Mai",
"M.",
""
],
[
"Manley",
"D. M.",
""
],
[
"Mathieu",
"V.",
""
],
[
"Myhrer",
"F.",
""
],
[
"Nakayama",
"K.",
""
],
[
"Noumi",
"H.",
""
],
[
"Oh",
"Y.",
""
],
[
"Ohnishi",
"H.",
""
],
[
"Oset",
"E.",
""
],
[
"Pennington",
"M.",
""
],
[
"Ramos",
"A.",
""
],
[
"Richards",
"D.",
""
],
[
"Santopinto",
"E.",
""
],
[
"Schumacher",
"R.",
""
],
[
"Szczepaniak",
"A.",
""
],
[
"Taylor",
"S.",
""
],
[
"Wojtsekhowski",
"B.",
""
],
[
"Xie",
"Ju-Jun",
""
],
[
"Ziegler",
"V.",
""
],
[
"Zou",
"B.",
""
]
] | The KL2016 Workshop is following the Letter of Intent LoI12-15-001 "Physics Opportunities with Secondary KL beam at JLab" submitted to PAC43 with the main focus on the physics of excited hyperons produced by the Kaon beam on unpolarized and polarized targets with GlueX setup in Hall D. Such studies will broaden a physics program of hadron spectroscopy extending it to the strange sector. The Workshop was organized to get a feedback from the community to strengthen physics motivation of the LoI and prepare a full proposal. Further details about the Workshop can be found on the web page of the conference: http://www.jlab.org/conferences/kl2016/index.html . |
1512.07853 | Jae Sik Lee | Kingman Cheung, P. Ko, Jae Sik Lee, Jubin Park, and Po-Yan Tseng | Higgs precision study of the 750 GeV diphoton resonance and the 125 GeV
standard model Higgs boson with Higgs-singlet mixing | 19 pages, 2 figures, to appear in PRD | Phys. Rev. D 94, 033010 (2016) | 10.1103/PhysRevD.94.033010 | CNU-HEP-15-08 | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We interpret the potential observation of the 750 GeV di-photon resonance at
the LHC in models, in which an $SU(2)$ isospin-singlet scalar boson mixes with
the Standard Model (SM) Higgs boson through an angle $\alpha$. Allowing the
singlet scalar boson to have renormalizable couplings to vector-like leptons
and quarks and introducing sizable decay width of the 750 GeV di-photon
resonance into non-SM particles such as dark matters, we can explain the large
production cross section $\sigma(H_2) \times B(H_2 \to \gamma\gamma)$ as well
as the apparent large total width of the boson without conflicts from the
results obtained by previous global fits to the SM Higgs boson data.
| [
{
"created": "Thu, 24 Dec 2015 16:31:59 GMT",
"version": "v1"
},
{
"created": "Tue, 16 Aug 2016 04:57:47 GMT",
"version": "v2"
}
] | 2016-08-31 | [
[
"Cheung",
"Kingman",
""
],
[
"Ko",
"P.",
""
],
[
"Lee",
"Jae Sik",
""
],
[
"Park",
"Jubin",
""
],
[
"Tseng",
"Po-Yan",
""
]
] | We interpret the potential observation of the 750 GeV di-photon resonance at the LHC in models, in which an $SU(2)$ isospin-singlet scalar boson mixes with the Standard Model (SM) Higgs boson through an angle $\alpha$. Allowing the singlet scalar boson to have renormalizable couplings to vector-like leptons and quarks and introducing sizable decay width of the 750 GeV di-photon resonance into non-SM particles such as dark matters, we can explain the large production cross section $\sigma(H_2) \times B(H_2 \to \gamma\gamma)$ as well as the apparent large total width of the boson without conflicts from the results obtained by previous global fits to the SM Higgs boson data. |
1912.00344 | Kang Xian-Wei | Xian-Wei Kang, J.A.Oller | Nature of $X(3872)$ from the line shape | Conference proceeding for HADRON 2019. August 16-21, Guilin, China | null | null | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Using a general parameterization of two-body scattering amplitude, we
systematically analyze the corresponding data on $X(3872)$, more explicitly,
the CDF data on inclusive $p\bar{p}$ scattering to $J/\psi \pi^+\pi^-$, and the
Belle and BaBar data on $B$ decays to $K\, J/\psi \pi^+\pi^-$ and $K
D\bar{D}^{*0}$ around the $D^0\bar{D}^{*0}$ threshold. We achieve a good
reproduction of data and find that the $X(3872)$ can be interpreted as a bound
and/or virtual state, or even higher-order (double or triple) virtual sate
pole. The latter point was not realized previously in the literature. % The
latter point has not been realized in other literatures. As a result, the
compositeness of the $X(3872)$ can vary largely from nearly 0 to 1. More
higher-precision data is needed to discriminate its pole structure and nature.
| [
{
"created": "Sun, 1 Dec 2019 07:19:35 GMT",
"version": "v1"
}
] | 2019-12-03 | [
[
"Kang",
"Xian-Wei",
""
],
[
"Oller",
"J. A.",
""
]
] | Using a general parameterization of two-body scattering amplitude, we systematically analyze the corresponding data on $X(3872)$, more explicitly, the CDF data on inclusive $p\bar{p}$ scattering to $J/\psi \pi^+\pi^-$, and the Belle and BaBar data on $B$ decays to $K\, J/\psi \pi^+\pi^-$ and $K D\bar{D}^{*0}$ around the $D^0\bar{D}^{*0}$ threshold. We achieve a good reproduction of data and find that the $X(3872)$ can be interpreted as a bound and/or virtual state, or even higher-order (double or triple) virtual sate pole. The latter point was not realized previously in the literature. % The latter point has not been realized in other literatures. As a result, the compositeness of the $X(3872)$ can vary largely from nearly 0 to 1. More higher-precision data is needed to discriminate its pole structure and nature. |
1808.00965 | James Gainer | James S. Gainer, Mart\'in Gonz\'alez-Alonso, Admir Greljo, Senad
Isakovi\'c, Gino Isidori, Andrey Korytov, Joseph Lykken, David Marzocca,
Konstantin T. Matchev, Predrag Milenovi\'c, Guenakh Mitselmakher, Stephen
Mrenna, Myeonghun Park, Aurelijus Rinkevicius, and Nudzeim Selimovi\'c | Adding Pseudo-Observables to the Four-Lepton Experimentalist's Toolbox | 33 pages, 4 figures consisting of 9 panels. Added reference.
Corresponds to version accepted by JHEP | null | 10.1007/JHEP10(2018)073 | CERN-TH-2018-178, FERMILAB-PUB-18-332-CD, UH-511-1255-18 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The "golden" channel, in which the newly-discovered Higgs boson decays to
four leptons by means of intermediate vector bosons, is important for
determining the properties of the Higgs boson and for searching for subtle new
physics effects. Different approaches exist for parametrizing the relevant
Higgs couplings in this channel; here we relate the use of pseudo-observables
to methods based on specifying the most general amplitude or Lagrangian terms
for the $HVV$ interactions. We also provide projections for sensitivity in this
channel in several novel scenarios, illustrating the use of pseudo-observables,
and analyze the role of kinematic distributions and (ratios of) rates in such
$H\to4\ell$ studies.
| [
{
"created": "Thu, 2 Aug 2018 18:00:01 GMT",
"version": "v1"
},
{
"created": "Tue, 9 Oct 2018 15:05:06 GMT",
"version": "v2"
}
] | 2018-11-14 | [
[
"Gainer",
"James S.",
""
],
[
"González-Alonso",
"Martín",
""
],
[
"Greljo",
"Admir",
""
],
[
"Isaković",
"Senad",
""
],
[
"Isidori",
"Gino",
""
],
[
"Korytov",
"Andrey",
""
],
[
"Lykken",
"Joseph",
""
],
[
"Marzocca",
"David",
""
],
[
"Matchev",
"Konstantin T.",
""
],
[
"Milenović",
"Predrag",
""
],
[
"Mitselmakher",
"Guenakh",
""
],
[
"Mrenna",
"Stephen",
""
],
[
"Park",
"Myeonghun",
""
],
[
"Rinkevicius",
"Aurelijus",
""
],
[
"Selimović",
"Nudzeim",
""
]
] | The "golden" channel, in which the newly-discovered Higgs boson decays to four leptons by means of intermediate vector bosons, is important for determining the properties of the Higgs boson and for searching for subtle new physics effects. Different approaches exist for parametrizing the relevant Higgs couplings in this channel; here we relate the use of pseudo-observables to methods based on specifying the most general amplitude or Lagrangian terms for the $HVV$ interactions. We also provide projections for sensitivity in this channel in several novel scenarios, illustrating the use of pseudo-observables, and analyze the role of kinematic distributions and (ratios of) rates in such $H\to4\ell$ studies. |
1810.07068 | Carlos E. Yaguna | Farinaldo S. Queiroz, Carlos E. Yaguna | Gamma-ray lines may reveal the CP nature of the dark matter particle | 6 pages, 5 figures | null | 10.1088/1475-7516/2019/01/047 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Determining the fundamental properties of the dark matter is one of the most
important open problems in particle physics today. If the dark matter particle
has spin zero, one of these properties is its CP nature. That is, whether it is
CP-even (scalar), CP-odd (pseudoscalar), or if its interactions violate CP. In
this paper, we show that the observation of $\gamma$-ray lines arising from the
decay of a spin-zero dark matter particle could be used to discriminate among
these possibilities. We consider a general setup where dark matter decay is
induced by effective operators and demonstrate that, due to gauge invariance,
there exists correlations among the branching ratios into gauge boson final
states ($\gamma\gamma$, $\gamma Z$, $W^+W^-$, $ZZ$) that depend on the mass and
the CP properties of the dark matter. Consequently, the future observation of
$\gamma$-ray lines may in principle be used to establish the CP nature of the
dark matter particle.
| [
{
"created": "Tue, 16 Oct 2018 15:14:28 GMT",
"version": "v1"
}
] | 2019-01-30 | [
[
"Queiroz",
"Farinaldo S.",
""
],
[
"Yaguna",
"Carlos E.",
""
]
] | Determining the fundamental properties of the dark matter is one of the most important open problems in particle physics today. If the dark matter particle has spin zero, one of these properties is its CP nature. That is, whether it is CP-even (scalar), CP-odd (pseudoscalar), or if its interactions violate CP. In this paper, we show that the observation of $\gamma$-ray lines arising from the decay of a spin-zero dark matter particle could be used to discriminate among these possibilities. We consider a general setup where dark matter decay is induced by effective operators and demonstrate that, due to gauge invariance, there exists correlations among the branching ratios into gauge boson final states ($\gamma\gamma$, $\gamma Z$, $W^+W^-$, $ZZ$) that depend on the mass and the CP properties of the dark matter. Consequently, the future observation of $\gamma$-ray lines may in principle be used to establish the CP nature of the dark matter particle. |
1706.09313 | Satyanarayan Mukhopadhyay | Kaoru Hagiwara, Kai Ma and Satyanarayan Mukhopadhyay | Closing in on the chargino contribution to the muon g-2 in the MSSM:
current LHC constraints | 28 pages, 14 figures; v2: Note added with updated 13 TeV LHC
constraints using 36.1 fb^{-1} results, version to appear in Physical Review
D | Phys. Rev. D 97, 055035 (2018) | 10.1103/PhysRevD.97.055035 | PITT-PACC 1621 | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We revisit the current LHC constraints on the electroweak-ino sector
parameters in the minimal supersymmetric standard model (MSSM) that are
relevant to explaining the $(g-2)_\mu$ anomaly via the dominant chargino and
muon sneutrino loop. Since the LHC bounds on electroweak-inos become weaker if
they decay via an intermediate stau or a tau sneutrino instead of the first two
generation sleptons, we perform a detailed analysis of the scenario with a bino
as the lightest supersymmetric particle (LSP) and a light stau as the
next-to-lightest one (NLSP). Even in this scenario, the chargino sector
parameters in the MSSM that can account for the $(g-2)_\mu$ anomaly within $1
\sigma$ are already found to be significantly constrained by the 8 TeV LHC and
the available subset of the 13 TeV LHC limits. We also estimate the current LHC
exclusions in the left-smuon (and/or left-selectron) NLSP scenario from
multilepton searches, and further combine the constraints from the multi-tau
and multi-lepton channels for a mass spectrum in which all three generations of
sleptons are lighter than the chargino. In the latter two cases, small corners
of the $1 \sigma$ favoured region for $(g-2)_\mu$ are still allowed at present.
| [
{
"created": "Wed, 28 Jun 2017 14:29:51 GMT",
"version": "v1"
},
{
"created": "Wed, 7 Mar 2018 18:37:54 GMT",
"version": "v2"
}
] | 2018-04-04 | [
[
"Hagiwara",
"Kaoru",
""
],
[
"Ma",
"Kai",
""
],
[
"Mukhopadhyay",
"Satyanarayan",
""
]
] | We revisit the current LHC constraints on the electroweak-ino sector parameters in the minimal supersymmetric standard model (MSSM) that are relevant to explaining the $(g-2)_\mu$ anomaly via the dominant chargino and muon sneutrino loop. Since the LHC bounds on electroweak-inos become weaker if they decay via an intermediate stau or a tau sneutrino instead of the first two generation sleptons, we perform a detailed analysis of the scenario with a bino as the lightest supersymmetric particle (LSP) and a light stau as the next-to-lightest one (NLSP). Even in this scenario, the chargino sector parameters in the MSSM that can account for the $(g-2)_\mu$ anomaly within $1 \sigma$ are already found to be significantly constrained by the 8 TeV LHC and the available subset of the 13 TeV LHC limits. We also estimate the current LHC exclusions in the left-smuon (and/or left-selectron) NLSP scenario from multilepton searches, and further combine the constraints from the multi-tau and multi-lepton channels for a mass spectrum in which all three generations of sleptons are lighter than the chargino. In the latter two cases, small corners of the $1 \sigma$ favoured region for $(g-2)_\mu$ are still allowed at present. |
2108.00218 | Sindhu D G | Sindhu D G, Akhilesh Ranjan | Study of tetraquarks in dipole-dipole interaction potential | 11 pages, 4 figures, Submitted to European Physical Journal Plus
(EPJP) | null | null | null | hep-ph nucl-th | http://creativecommons.org/licenses/by-nc-nd/4.0/ | In recent years tetraquark and pentaquark states have received much attention
due to the significant experimental findings. In this work masses of some heavy
tetraquarks are estimated by considering the spin-spin interaction, the
dipole-dipole interaction, and the meson-meson interaction. It is found that
such interactions give significant mass contributions. The Regge trajectory of
X(3872) state is also studied and is found to be non-linear. Masses of some
tetraquark states are also proposed.
| [
{
"created": "Sat, 31 Jul 2021 11:32:13 GMT",
"version": "v1"
}
] | 2021-08-03 | [
[
"G",
"Sindhu D",
""
],
[
"Ranjan",
"Akhilesh",
""
]
] | In recent years tetraquark and pentaquark states have received much attention due to the significant experimental findings. In this work masses of some heavy tetraquarks are estimated by considering the spin-spin interaction, the dipole-dipole interaction, and the meson-meson interaction. It is found that such interactions give significant mass contributions. The Regge trajectory of X(3872) state is also studied and is found to be non-linear. Masses of some tetraquark states are also proposed. |
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