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|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
2307.14652 | C. Pallis | C. Pallis | T-Model Higgs Inflation in Supergravity | Prepared for the Proceedings of HEP 2023, Ioannina, Greece --
Conference C23-04-05. arXiv admin note: text overlap with arXiv:2305.00523 | null | null | null | hep-ph astro-ph.CO hep-th | http://creativecommons.org/licenses/by/4.0/ | We focus on a simple, natural and predictive T model of inflation in
Supergravity employing as inflaton the Higgs field which leads to the
spontaneous breaking of a U(1)_(B-L) symmetry at the SUSY GUT scale. We use a
renormalizable superpotential, fixed by a U(1) R symmetry, and a Kahler
potential which parameterizes the Kahler manifold
SU(2,1)/(SU(2)xU(1))x(SU(2)/U(1)) with scalar curvature R_K=-6/N+2/N_0 where
0<N_0<6. The spectral index ns turns out to be close to its present central
observational value and the tensor-to-scalar ratio r increases with N<36. The
model can be nicely linked to MSSM offering an explanation of the magnitude of
the mu parameter consistently with phenomenological data. It also allows for
baryogenesis via non-thermal leptogenesis with gravitino as light as 1 TeV.
| [
{
"created": "Thu, 27 Jul 2023 06:57:12 GMT",
"version": "v1"
}
] | 2023-07-28 | [
[
"Pallis",
"C.",
""
]
] | We focus on a simple, natural and predictive T model of inflation in Supergravity employing as inflaton the Higgs field which leads to the spontaneous breaking of a U(1)_(B-L) symmetry at the SUSY GUT scale. We use a renormalizable superpotential, fixed by a U(1) R symmetry, and a Kahler potential which parameterizes the Kahler manifold SU(2,1)/(SU(2)xU(1))x(SU(2)/U(1)) with scalar curvature R_K=-6/N+2/N_0 where 0<N_0<6. The spectral index ns turns out to be close to its present central observational value and the tensor-to-scalar ratio r increases with N<36. The model can be nicely linked to MSSM offering an explanation of the magnitude of the mu parameter consistently with phenomenological data. It also allows for baryogenesis via non-thermal leptogenesis with gravitino as light as 1 TeV. |
1306.6553 | Aleksander Kusina | A. Kusina, F. I. Olness, I. Schienbein, T. Jezo, K. Kovarik, T.
Stavreva, J. Y. Yu | A Hybrid Scheme for Heavy Flavors: Merging the FFNS and VFNS | 15 pages, 11 figures, updated to match journal | Phys. Rev. D 88, 074032 (2013) | 10.1103/PhysRevD.88.074032 | LPSC-13-104, LTH 977, LPN13-024, IPPP/13/22 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We introduce a Hybrid Variable Flavor Number Scheme for heavy flavors,
denoted H-VFNS, which incorporates the advantages of both the traditional
Variable Flavor Number Scheme (VFNS) as well as the Fixed Flavor Number Scheme
(FFNS). By including an explicit $N_F$-dependence in both the Parton
Distribution Functions (PDFs) and the strong coupling constant $\alpha_S$, we
generate coexisting sets of PDFs and $\alpha_S$ for $N_F=\{3,4,5,6\}$ at any
scale $\mu$, that are related analytically by the $\overline{\text{MS}}$
matching conditions. The H-VFNS resums the heavy quark contributions and
provides the freedom to choose the optimal $N_F$ for each particular data set.
Thus, we can fit selected HERA data in a FFNS framework, while retaining the
benefits of the VFNS to analyze LHC data at high scales. We illustrate how such
a fit can be implemented for the case of both HERA and LHC data.
| [
{
"created": "Thu, 27 Jun 2013 15:57:05 GMT",
"version": "v1"
},
{
"created": "Thu, 21 Nov 2013 02:24:37 GMT",
"version": "v2"
}
] | 2013-11-22 | [
[
"Kusina",
"A.",
""
],
[
"Olness",
"F. I.",
""
],
[
"Schienbein",
"I.",
""
],
[
"Jezo",
"T.",
""
],
[
"Kovarik",
"K.",
""
],
[
"Stavreva",
"T.",
""
],
[
"Yu",
"J. Y.",
""
]
] | We introduce a Hybrid Variable Flavor Number Scheme for heavy flavors, denoted H-VFNS, which incorporates the advantages of both the traditional Variable Flavor Number Scheme (VFNS) as well as the Fixed Flavor Number Scheme (FFNS). By including an explicit $N_F$-dependence in both the Parton Distribution Functions (PDFs) and the strong coupling constant $\alpha_S$, we generate coexisting sets of PDFs and $\alpha_S$ for $N_F=\{3,4,5,6\}$ at any scale $\mu$, that are related analytically by the $\overline{\text{MS}}$ matching conditions. The H-VFNS resums the heavy quark contributions and provides the freedom to choose the optimal $N_F$ for each particular data set. Thus, we can fit selected HERA data in a FFNS framework, while retaining the benefits of the VFNS to analyze LHC data at high scales. We illustrate how such a fit can be implemented for the case of both HERA and LHC data. |
1307.7969 | Matthew Mewes | Matthew Mewes | Higher-order Lorentz violation | Presented at the Sixth Meeting on CPT and Lorentz Symmetry,
Bloomington, Indiana, June 17-21, 2013 | null | 10.1142/9789814566438_0017 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | This brief review discusses Lorentz-violating operators of arbitrary
dimension within the photon and neutrino sectors of the Standard-Model
Extension.
| [
{
"created": "Mon, 29 Jul 2013 14:51:01 GMT",
"version": "v1"
}
] | 2017-08-23 | [
[
"Mewes",
"Matthew",
""
]
] | This brief review discusses Lorentz-violating operators of arbitrary dimension within the photon and neutrino sectors of the Standard-Model Extension. |
hep-ph/0110153 | Vincenzo Cirigliano | V. Cirigliano, M. Knecht, H. Neufeld, H. Rupertsberger, P. Talavera | Radiative corrections to K_{l3} decays | 13 pages | Eur.Phys.J.C23:121-133,2002 | 10.1007/s100520100825 | UWThPh-2001-44, IFIC/01-55, CPT-2001/P.4248 | hep-ph | null | We present a complete calculation of the K_{l3} decays K^+ --> pi^0 l^+ nu_l
and K^0 --> pi^- l^+ nu_l to O(p^4, (m_d-m_u) p^2, e^2 p^2) in chiral
perturbation theory with virtual photons and leptons. We introduce the concept
of generalized form factors and kinematical densities in the presence of
electromagnetism, and propose a possible treatment of the real photon emission
in K^+_{l3} decays. We illustrate our results by applying them to the
extraction of the Kobayashi--Maskawa matrix element |V_{us}| from the
experimental K^+_{e3} decay parameters.
| [
{
"created": "Thu, 11 Oct 2001 14:14:02 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Cirigliano",
"V.",
""
],
[
"Knecht",
"M.",
""
],
[
"Neufeld",
"H.",
""
],
[
"Rupertsberger",
"H.",
""
],
[
"Talavera",
"P.",
""
]
] | We present a complete calculation of the K_{l3} decays K^+ --> pi^0 l^+ nu_l and K^0 --> pi^- l^+ nu_l to O(p^4, (m_d-m_u) p^2, e^2 p^2) in chiral perturbation theory with virtual photons and leptons. We introduce the concept of generalized form factors and kinematical densities in the presence of electromagnetism, and propose a possible treatment of the real photon emission in K^+_{l3} decays. We illustrate our results by applying them to the extraction of the Kobayashi--Maskawa matrix element |V_{us}| from the experimental K^+_{e3} decay parameters. |
hep-ph/9204227 | Adrian Cooper | Shahar Ben-Menahem and Adrian Cooper | Superconductivity Solves the Monopole Problem for Alice Strings | 16 pages, 7 figures (not included) | Nucl.Phys. B388 (1992) 393-408 | 10.1016/0550-3213(92)90619-M | null | hep-ph | null | Alice strings are cosmic strings that turn matter into antimatter. Although
they arise naturally in many GUT's, it has long been believed that because of
the monopole problem they can have no cosmological effects. We show this
conclusion to be false; by using the Langacker-Pi mechanism, monopoles can in
fact be annihilated while Alice strings are left intact. This opens up the
possibility that they can after all contribute to cosmology, and we mention
some particularly important examples.
| [
{
"created": "Thu, 23 Apr 1992 00:24:24 GMT",
"version": "v1"
}
] | 2009-10-22 | [
[
"Ben-Menahem",
"Shahar",
""
],
[
"Cooper",
"Adrian",
""
]
] | Alice strings are cosmic strings that turn matter into antimatter. Although they arise naturally in many GUT's, it has long been believed that because of the monopole problem they can have no cosmological effects. We show this conclusion to be false; by using the Langacker-Pi mechanism, monopoles can in fact be annihilated while Alice strings are left intact. This opens up the possibility that they can after all contribute to cosmology, and we mention some particularly important examples. |
1510.05910 | Xin Liu | Xin Liu, Hsiang-nan Li, and Zhen-Jun Xiao | Resolving the $B \to K \pi$ puzzle by Glauber-gluon effects | Revtex file, 6 pages, 4 tables, and 1 figure; to appear in PRD,
matching the published version | Phys. Rev. D 93, 014024 (2016) | 10.1103/PhysRevD.93.014024 | null | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We extend the perturbative QCD formalism including the Glauber gluons, which
has been shown to accommodate the measured $B \to \pi \pi$ and $B^0\to\rho^0
\rho^0$ branching ratios simultaneously, to the analysis of the $B \to K \pi$
and $K \bar K$ decays. It is observed that the convolution of the universal
Glauber phase factors with the transverse-momentum-dependent kaon wave function
reveals weaker (stronger) Glauber effects than in the pion ($\rho$ meson) case
as expected. Our predictions for the branching ratios and the direct CP
asymmetries of the $B \to K \pi$ and $K \bar K$ modes at next-to-leading-order
accuracy agree well with data. In particular, the predicted difference of the
$B^\pm \to K^\pm \pi^0$ and $B^0 \to K^\pm \pi^\mp$ direct CP asymmetries,
$\Delta A_{K\pi}\equiv A_{\rm CP}^{\rm dir}(K^\pm \pi^0)[0.021 \pm 0.016] -
A_{\rm CP}^{\rm dir}(K^\pm \pi^\mp)[-0.081 \pm 0.017] = 0.102 \pm 0.023$, is
consistent with the measured $\Delta A_{K\pi} = 0.119 \pm 0.022$ within
uncertainties, and the known $B \to K\pi$ puzzle is resolved. The above $B \to
\pi \pi$, $K\pi$ and $K \bar K$ studies confirm that the Glauber gluons
associated with pseudo-Nambu-Goldstone bosons enhance the color-suppressed tree
amplitude significantly, but have a small impact on other topological
amplitudes.
| [
{
"created": "Tue, 20 Oct 2015 14:27:26 GMT",
"version": "v1"
},
{
"created": "Wed, 21 Oct 2015 13:20:22 GMT",
"version": "v2"
},
{
"created": "Tue, 17 Nov 2015 14:36:52 GMT",
"version": "v3"
},
{
"created": "Fri, 15 Jan 2016 10:07:04 GMT",
"version": "v4"
}
] | 2016-01-27 | [
[
"Liu",
"Xin",
""
],
[
"Li",
"Hsiang-nan",
""
],
[
"Xiao",
"Zhen-Jun",
""
]
] | We extend the perturbative QCD formalism including the Glauber gluons, which has been shown to accommodate the measured $B \to \pi \pi$ and $B^0\to\rho^0 \rho^0$ branching ratios simultaneously, to the analysis of the $B \to K \pi$ and $K \bar K$ decays. It is observed that the convolution of the universal Glauber phase factors with the transverse-momentum-dependent kaon wave function reveals weaker (stronger) Glauber effects than in the pion ($\rho$ meson) case as expected. Our predictions for the branching ratios and the direct CP asymmetries of the $B \to K \pi$ and $K \bar K$ modes at next-to-leading-order accuracy agree well with data. In particular, the predicted difference of the $B^\pm \to K^\pm \pi^0$ and $B^0 \to K^\pm \pi^\mp$ direct CP asymmetries, $\Delta A_{K\pi}\equiv A_{\rm CP}^{\rm dir}(K^\pm \pi^0)[0.021 \pm 0.016] - A_{\rm CP}^{\rm dir}(K^\pm \pi^\mp)[-0.081 \pm 0.017] = 0.102 \pm 0.023$, is consistent with the measured $\Delta A_{K\pi} = 0.119 \pm 0.022$ within uncertainties, and the known $B \to K\pi$ puzzle is resolved. The above $B \to \pi \pi$, $K\pi$ and $K \bar K$ studies confirm that the Glauber gluons associated with pseudo-Nambu-Goldstone bosons enhance the color-suppressed tree amplitude significantly, but have a small impact on other topological amplitudes. |
1912.12968 | Jamie M. Stafford | Jamie M. Stafford, Paolo Alba, Rene Bellwied, Valentina
Mantovani-Sarti, Jacquelyn Noronha-Hostler, Paolo Parotto, Israel
Portillo-Vazquez, and Claudia Ratti | Determination of Chemical Freeze-out Parameters from Net-kaon
Fluctuations at RHIC | 5 pages, 2 figures, contribution to the proceedings from the 18th
International Conference on Strangeness in Quark Matter (SQM 2019) | null | null | null | hep-ph nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We calculate the mean-over-variance ratio of the net-kaon fluctuations in the
Hadron Resonance Gas (HRG) Model for the five highest energies of the RHIC Beam
Energy Scan (BES) for different particle data lists. We compare these results
with the latest experimental data from the STAR collaboration in order to
extract sets of chemical freeze-out parameters for each list. We focused on the
PDG2012 and PDG2016+ particle lists, which differ largely in the number of
resonant states. Our analysis determines the effect of the amount of resonances
included in the HRG on the freeze-out conditions.
| [
{
"created": "Mon, 30 Dec 2019 15:34:18 GMT",
"version": "v1"
}
] | 2020-01-01 | [
[
"Stafford",
"Jamie M.",
""
],
[
"Alba",
"Paolo",
""
],
[
"Bellwied",
"Rene",
""
],
[
"Mantovani-Sarti",
"Valentina",
""
],
[
"Noronha-Hostler",
"Jacquelyn",
""
],
[
"Parotto",
"Paolo",
""
],
[
"Portillo-Vazquez",
"Israel",
""
],
[
"Ratti",
"Claudia",
""
]
] | We calculate the mean-over-variance ratio of the net-kaon fluctuations in the Hadron Resonance Gas (HRG) Model for the five highest energies of the RHIC Beam Energy Scan (BES) for different particle data lists. We compare these results with the latest experimental data from the STAR collaboration in order to extract sets of chemical freeze-out parameters for each list. We focused on the PDG2012 and PDG2016+ particle lists, which differ largely in the number of resonant states. Our analysis determines the effect of the amount of resonances included in the HRG on the freeze-out conditions. |
1503.02012 | Kirill Semenov-Tian-Shansky | B. Pire, K. Semenov-Tian-Shansky, L. Szymanowski | QCD description of backward vector meson hard electroproduction | 37 pages, 8 figures, 1 table | Phys. Rev. D 91, 094006 (2015) | 10.1103/PhysRevD.91.094006 | CPHT-RR004.0315 | hep-ph hep-ex nucl-ex nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We consider backward vector meson exclusive electroproduction off nucleons in
the framework of collinear QCD factorization. Nucleon to vector meson
transition distribution amplitudes arise as building blocks for the
corresponding factorized amplitudes. In the near-backward kinematics, the
suggested factorization mechanism results in the dominance of the transverse
cross section of vector meson production ($\sigma_T \gg \sigma_L$) and in the
characteristic $1/Q^8$-scaling behavior of the cross section. We evaluate
nucleon to vector meson TDAs in the cross-channel nucleon exchange model and
present estimates of the differential cross section for backward $\rho^0$,
$\omega$ and $\phi$ meson production off protons. The resulting cross sections
are shown to be measurable in the forthcoming JLab@12 GeV experiments.
| [
{
"created": "Fri, 6 Mar 2015 17:02:55 GMT",
"version": "v1"
},
{
"created": "Tue, 10 Mar 2015 15:19:44 GMT",
"version": "v2"
}
] | 2015-05-13 | [
[
"Pire",
"B.",
""
],
[
"Semenov-Tian-Shansky",
"K.",
""
],
[
"Szymanowski",
"L.",
""
]
] | We consider backward vector meson exclusive electroproduction off nucleons in the framework of collinear QCD factorization. Nucleon to vector meson transition distribution amplitudes arise as building blocks for the corresponding factorized amplitudes. In the near-backward kinematics, the suggested factorization mechanism results in the dominance of the transverse cross section of vector meson production ($\sigma_T \gg \sigma_L$) and in the characteristic $1/Q^8$-scaling behavior of the cross section. We evaluate nucleon to vector meson TDAs in the cross-channel nucleon exchange model and present estimates of the differential cross section for backward $\rho^0$, $\omega$ and $\phi$ meson production off protons. The resulting cross sections are shown to be measurable in the forthcoming JLab@12 GeV experiments. |
0808.2399 | Buisseret Fabien Dr | F. Buisseret | Gluelump model with transverse constituent gluons | 4 pages | Eur.Phys.J.A38:233-238,2008 | 10.1140/epja/i2008-10663-9 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We show that C-odd gluelumps can be successfully described as bound states of
a single transverse constituent gluon evolving in the flux-tube-like potential
generated by a static color-octet source. The use of a helicity degree of
freedom rather than a spin one for the constituent gluon forbids the states
that are not observed in lattice QCD. Our model leads to a gluelump mass
spectrum in remarkable agreement with the available lattice data provided that
an additional parity-splitting mass term is introduced. We argue that such a
term is due to instanton-induced interactions in gluelumps.
| [
{
"created": "Mon, 18 Aug 2008 14:59:17 GMT",
"version": "v1"
},
{
"created": "Fri, 22 Aug 2008 09:17:36 GMT",
"version": "v2"
}
] | 2008-12-18 | [
[
"Buisseret",
"F.",
""
]
] | We show that C-odd gluelumps can be successfully described as bound states of a single transverse constituent gluon evolving in the flux-tube-like potential generated by a static color-octet source. The use of a helicity degree of freedom rather than a spin one for the constituent gluon forbids the states that are not observed in lattice QCD. Our model leads to a gluelump mass spectrum in remarkable agreement with the available lattice data provided that an additional parity-splitting mass term is introduced. We argue that such a term is due to instanton-induced interactions in gluelumps. |
2108.09071 | Luca Di Luzio | Luca Di Luzio | CP-violating Axions | 10 pages, 1 figure. Longer version of article to appear in
EPS-HEP2021 proceedings | null | null | null | hep-ph | http://creativecommons.org/licenses/by/4.0/ | While the axion was originally introduced to wash out CP violation from
strong interactions, new sources of CP violation beyond QCD might manifest
themselves via a tiny scalar axion-nucleon component. The latter can be
experimentally probed in axion-mediated force experiments, as suggested long
ago by J.E. Moody and F. Wilczek. In the present note, I review the physical
origin of CP-violating axion couplings and point out the special role of the
QCD axion as a low-energy portal to high-energy sources of CP violation.
| [
{
"created": "Fri, 20 Aug 2021 08:54:05 GMT",
"version": "v1"
}
] | 2021-08-23 | [
[
"Di Luzio",
"Luca",
""
]
] | While the axion was originally introduced to wash out CP violation from strong interactions, new sources of CP violation beyond QCD might manifest themselves via a tiny scalar axion-nucleon component. The latter can be experimentally probed in axion-mediated force experiments, as suggested long ago by J.E. Moody and F. Wilczek. In the present note, I review the physical origin of CP-violating axion couplings and point out the special role of the QCD axion as a low-energy portal to high-energy sources of CP violation. |
hep-ph/0111203 | Silvia Pascoli | S. Pascoli, S. T. Petcov | Majorana Neutrinos, CP-Violation, Neutrinoless Double-Beta and
Tritium-Beta Decays | 9 pages, Latex; 7 pages of text, 2 ps-figures. Results unchanged; few
clarifying remarks added. To be published in the Proceedings of the
Conference NANP'01, III International Conference on Non-Accelerator New
Physics, Dubna (Russia), June 19-23 2001 | Phys.Atom.Nucl. 66 (2003) 444-451; Yad.Fiz. 66 (2003) 472-479 | 10.1134/1.1563702 | SISSA-87/2001/EP | hep-ph | null | If the present or upcoming searches for neutrinoless double beta decay give a
positive result, the Majorana nature of massive neutrinos will be established.
From the determination of the value of the effective Majorana mass parameter
|<m>|, it would be possible to obtain information on the type of neutrino mass
spectrum. Assuming 3-neutrino mixing and massive Majorana neutrinos, we discuss
the information a measurement of, or an upper bound on, |<m>| can provide on
the value of the lightest neutrino mass m1. With additional data on the
neutrino masses obtained in tritium beta decay experiments, it might be
possible to establish whether the CP-symmetry is violated in the lepton sector.
This would require very high precision measurements. If CP-invariance holds,
the allowed patterns of the relative CP-parities of the massive Majorana
neutrinos would be determined.
| [
{
"created": "Fri, 16 Nov 2001 11:34:57 GMT",
"version": "v1"
},
{
"created": "Fri, 18 Jan 2002 14:02:25 GMT",
"version": "v2"
}
] | 2015-06-25 | [
[
"Pascoli",
"S.",
""
],
[
"Petcov",
"S. T.",
""
]
] | If the present or upcoming searches for neutrinoless double beta decay give a positive result, the Majorana nature of massive neutrinos will be established. From the determination of the value of the effective Majorana mass parameter |<m>|, it would be possible to obtain information on the type of neutrino mass spectrum. Assuming 3-neutrino mixing and massive Majorana neutrinos, we discuss the information a measurement of, or an upper bound on, |<m>| can provide on the value of the lightest neutrino mass m1. With additional data on the neutrino masses obtained in tritium beta decay experiments, it might be possible to establish whether the CP-symmetry is violated in the lepton sector. This would require very high precision measurements. If CP-invariance holds, the allowed patterns of the relative CP-parities of the massive Majorana neutrinos would be determined. |
1606.02981 | Sven Bjarke Gudnason | Sven Bjarke Gudnason, Muneto Nitta | Modifying the pion mass in the loosely bound Skyrme model | RevTeX: 28 pages, 13 figures; V2: published version, presentation
simplified | Phys. Rev. D 94, 065018 (2016) | 10.1103/PhysRevD.94.065018 | null | hep-ph nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the loosely bound Skyrme model with the addition of two different
pion mass terms; this is the most general potential of polynomial form up to
second order in the trace of the Skyrme field. The two pion mass terms are
called the standard pion mass term and the modified pion mass term. We find
that the binding energies are not reduced by the introduction of the modified
pion mass, but it is analogous to the standard pion mass term with a decrease
in the value of the mass parameter of the loosely bound potential (for large
values of the latter parameter). We find by increasing the overall pion mass
that we can reduce the classical binding energy of the 4-Skyrmion to the 2.7%
level and the total binding energy including the contribution from spin/isospin
quantization is reduced to the 5.8% level.
| [
{
"created": "Thu, 9 Jun 2016 14:52:22 GMT",
"version": "v1"
},
{
"created": "Sat, 17 Sep 2016 08:05:43 GMT",
"version": "v2"
}
] | 2016-09-20 | [
[
"Gudnason",
"Sven Bjarke",
""
],
[
"Nitta",
"Muneto",
""
]
] | We study the loosely bound Skyrme model with the addition of two different pion mass terms; this is the most general potential of polynomial form up to second order in the trace of the Skyrme field. The two pion mass terms are called the standard pion mass term and the modified pion mass term. We find that the binding energies are not reduced by the introduction of the modified pion mass, but it is analogous to the standard pion mass term with a decrease in the value of the mass parameter of the loosely bound potential (for large values of the latter parameter). We find by increasing the overall pion mass that we can reduce the classical binding energy of the 4-Skyrmion to the 2.7% level and the total binding energy including the contribution from spin/isospin quantization is reduced to the 5.8% level. |
1105.1092 | Buisseret Fabien Dr | Fabien Buisseret and Gwendolyn Lacroix | Comments on Yang-Mills thermodynamics, the Hagedorn spectrum and the
gluon gas | Discussion extended in v2 ; to appear in Phys Lett B | Physics Letters B 705 (2011) 405-409 | 10.1016/j.physletb.2011.10.039 | null | hep-ph hep-lat hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We discuss the dependence of pure Yang-Mills equation of state on the choice
of gauge algebra. In the confined phase, we generalize to an arbitrary simple
gauge algebra Meyer's proposal of modelling the Yang-Mills matter by an ideal
glueball gas in which the high-lying glueball spectrum is approximated by a
Hagedorn spectrum of closed-bosonic-string type. Such a formalism is undefined
above the Hagedorn temperature, corresponding to the phase transition toward a
deconfined state of matter in which gluons are the relevant degrees of freedom.
Under the assumption that the adjoint string tension and the typical energy
scale of the running coupling are gauge-algebra independent, we discuss about
how the behavior of thermodynamical quantities such as the trace anomaly should
depend on the gauge algebra in both the confined and deconfined phase. The
obtained results compare favourably with recent and accurate lattice data in
the $\mathfrak{su}(3)$ case and support the idea that the more the gauge
algebra has generators, the more the phase transition is of first-order type.
| [
{
"created": "Thu, 5 May 2011 14:55:24 GMT",
"version": "v1"
},
{
"created": "Mon, 17 Oct 2011 19:29:21 GMT",
"version": "v2"
}
] | 2011-11-01 | [
[
"Buisseret",
"Fabien",
""
],
[
"Lacroix",
"Gwendolyn",
""
]
] | We discuss the dependence of pure Yang-Mills equation of state on the choice of gauge algebra. In the confined phase, we generalize to an arbitrary simple gauge algebra Meyer's proposal of modelling the Yang-Mills matter by an ideal glueball gas in which the high-lying glueball spectrum is approximated by a Hagedorn spectrum of closed-bosonic-string type. Such a formalism is undefined above the Hagedorn temperature, corresponding to the phase transition toward a deconfined state of matter in which gluons are the relevant degrees of freedom. Under the assumption that the adjoint string tension and the typical energy scale of the running coupling are gauge-algebra independent, we discuss about how the behavior of thermodynamical quantities such as the trace anomaly should depend on the gauge algebra in both the confined and deconfined phase. The obtained results compare favourably with recent and accurate lattice data in the $\mathfrak{su}(3)$ case and support the idea that the more the gauge algebra has generators, the more the phase transition is of first-order type. |
1009.1535 | Andreas Krassnigg | M. Blank and A. Krassnigg | Matrix algorithms for solving (in)homogeneous bound state equations | 11 pages, 7 figures | Comput.Phys.Commun.182:1391-1401,2011 | 10.1016/j.cpc.2011.03.003 | null | hep-ph nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In the functional approach to quantum chromodynamics, the properties of
hadronic bound states are accessible via covariant integral equations, e.g. the
Bethe-Salpeter equations for mesons. In particular, one has to deal with
linear, homogeneous integral equations which, in sophisticated model setups,
use numerical representations of the solutions of other integral equations as
part of their input. Analogously, inhomogeneous equations can be constructed to
obtain off-shell information in addition to bound-state masses and other
properties obtained from the covariant analogue to a wave function of the bound
state. These can be solved very efficiently using well-known matrix algorithms
for eigenvalues (in the homogeneous case) and the solution of linear systems
(in the inhomogeneous case). We demonstrate this by solving the homogeneous and
inhomogeneous Bethe-Salpeter equations and find, e.g. that for the calculation
of the mass spectrum it is more efficient to use the inhomogeneous equation.
This is valuable insight, in particular for the study of baryons in a
three-quark setup and more involved systems.
| [
{
"created": "Wed, 8 Sep 2010 13:57:17 GMT",
"version": "v1"
}
] | 2011-05-05 | [
[
"Blank",
"M.",
""
],
[
"Krassnigg",
"A.",
""
]
] | In the functional approach to quantum chromodynamics, the properties of hadronic bound states are accessible via covariant integral equations, e.g. the Bethe-Salpeter equations for mesons. In particular, one has to deal with linear, homogeneous integral equations which, in sophisticated model setups, use numerical representations of the solutions of other integral equations as part of their input. Analogously, inhomogeneous equations can be constructed to obtain off-shell information in addition to bound-state masses and other properties obtained from the covariant analogue to a wave function of the bound state. These can be solved very efficiently using well-known matrix algorithms for eigenvalues (in the homogeneous case) and the solution of linear systems (in the inhomogeneous case). We demonstrate this by solving the homogeneous and inhomogeneous Bethe-Salpeter equations and find, e.g. that for the calculation of the mass spectrum it is more efficient to use the inhomogeneous equation. This is valuable insight, in particular for the study of baryons in a three-quark setup and more involved systems. |
2408.03276 | Howard Baer | Howard Baer, Vernon Barger, Jessica Bolich, Juhi Dutta and Dibyashree
Sengupta | Minding the gap: testing natural anomaly-mediated SUSY breaking at high
luminosity LHC | 25 pages with 10 figures | null | null | OU-HEP-240731 | hep-ph | http://creativecommons.org/licenses/by/4.0/ | While the minimal anomaly-mediated SUSY breaking model (mAMSB) seems ruled
out by constraints on Higgs mass, naturalness and wino dark matter, a slightly
generalized version dubbed natural AMSB (nAMSB) remains both viable and
compelling. Like mAMSB, nAMSB features winos as the lightest gauginos, but
unlike mAMSB, nAMSB allows a small mu parameter so that higgsinos are the
lightest of electroweakinos (EWinos). nAMSB spectra depend on the input value
of gravitino mass m_{3/2}, where the lower range of m_{3/2} is excluded by LHC
gluino pair searches while a higher m_{3/2} band is excluded by LHC limits on
wino pair production followed by boosted hadronic wino decays. A remaining
intermediate gap in m_{3/2} values remains allowed by present LHC searches, but
appears to be completely explorable by high luminosity ugrades of LHC (HL-LHC).
We explore a variety of compelling discovery channels that may allow one to
close the intermediate gap in m_{3/2} values: 1. same-sign diboson +MET (SSdB)
production arising from wino pair production, leading to same-sign dileptons
plus MET, 2. trilepton production arising from wino pair production and 3. soft
dilepton plus jet events from higgsino pair production, 4. top-squark pair
production. From our signal-to-background analysis along a nAMSB model line, we
expect HL-LHC to either discover or rule out the nAMSB model with 3000 fb^{-1}
of integrated luminosity.
| [
{
"created": "Tue, 6 Aug 2024 16:18:27 GMT",
"version": "v1"
}
] | 2024-08-07 | [
[
"Baer",
"Howard",
""
],
[
"Barger",
"Vernon",
""
],
[
"Bolich",
"Jessica",
""
],
[
"Dutta",
"Juhi",
""
],
[
"Sengupta",
"Dibyashree",
""
]
] | While the minimal anomaly-mediated SUSY breaking model (mAMSB) seems ruled out by constraints on Higgs mass, naturalness and wino dark matter, a slightly generalized version dubbed natural AMSB (nAMSB) remains both viable and compelling. Like mAMSB, nAMSB features winos as the lightest gauginos, but unlike mAMSB, nAMSB allows a small mu parameter so that higgsinos are the lightest of electroweakinos (EWinos). nAMSB spectra depend on the input value of gravitino mass m_{3/2}, where the lower range of m_{3/2} is excluded by LHC gluino pair searches while a higher m_{3/2} band is excluded by LHC limits on wino pair production followed by boosted hadronic wino decays. A remaining intermediate gap in m_{3/2} values remains allowed by present LHC searches, but appears to be completely explorable by high luminosity ugrades of LHC (HL-LHC). We explore a variety of compelling discovery channels that may allow one to close the intermediate gap in m_{3/2} values: 1. same-sign diboson +MET (SSdB) production arising from wino pair production, leading to same-sign dileptons plus MET, 2. trilepton production arising from wino pair production and 3. soft dilepton plus jet events from higgsino pair production, 4. top-squark pair production. From our signal-to-background analysis along a nAMSB model line, we expect HL-LHC to either discover or rule out the nAMSB model with 3000 fb^{-1} of integrated luminosity. |
hep-ph/9605424 | Antonio | A. Pineda | More nonperturbative corrections to the fine and hyperfine splitting in
the heavy quarkonium | 9 pages, LaTeX, More self-contained and lengthier version without
changing physical outputs. To be published in Phys. Rev. D | Phys.Rev.D55:407,1997; Erratum-ibid.D59:099901,1999;
Phys.Rev.D59:099901,1999 | 10.1103/PhysRevD.55.407 10.1103/PhysRevD.59.099901 | UB-ECM-PF-96/11 | hep-ph | null | The leading nonperturbative effects to the fine and hyperfine splitting were
calculated some time ago. Recently, they have been used in order to obtain
realistic numerical results for the lower levels in bottomonium systems. We
point out that a contribution of the same order $O(\Lambda_{QCD}^4/m^3
\alpha_s^2)$ has been overlooked. We calculate it in this paper.
| [
{
"created": "Tue, 28 May 1996 16:40:22 GMT",
"version": "v1"
},
{
"created": "Wed, 16 Oct 1996 10:26:58 GMT",
"version": "v2"
}
] | 2014-11-17 | [
[
"Pineda",
"A.",
""
]
] | The leading nonperturbative effects to the fine and hyperfine splitting were calculated some time ago. Recently, they have been used in order to obtain realistic numerical results for the lower levels in bottomonium systems. We point out that a contribution of the same order $O(\Lambda_{QCD}^4/m^3 \alpha_s^2)$ has been overlooked. We calculate it in this paper. |
0802.3609 | Mohamad Ali Gomshi Nobary | M.A. Gomshi Nobary and B. Mojaveri | A fresh look at neutral meson mixing | 11 pages | Phys. Lett. B 649 (2007) 417 | 10.1016/j.physletb.2007.04.025 | Razi-hep-135 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this work we show that the existence of a complete biorthonormal set of
eigenvectors of the effective Hamiltonian governing the time evolution of
neutral meson system is a necessary condition for diagonalizability of such a
Hamiltonian. We also study the possibility of probing the $CPT$ invariance by
observing the time dependence of cascade decays of type
$P^{\circ}(\bar{P^{\circ}})\to \{M_a,M_b\}X\to fX$ by employing such basis and
exactly determine the $CPT$ violation parameter by comparing the time
dependence of the cascade decays of tagged $P^{\circ}$ and tagged
$\bar{P^{\circ}}$.
| [
{
"created": "Mon, 25 Feb 2008 12:09:03 GMT",
"version": "v1"
}
] | 2009-11-13 | [
[
"Nobary",
"M. A. Gomshi",
""
],
[
"Mojaveri",
"B.",
""
]
] | In this work we show that the existence of a complete biorthonormal set of eigenvectors of the effective Hamiltonian governing the time evolution of neutral meson system is a necessary condition for diagonalizability of such a Hamiltonian. We also study the possibility of probing the $CPT$ invariance by observing the time dependence of cascade decays of type $P^{\circ}(\bar{P^{\circ}})\to \{M_a,M_b\}X\to fX$ by employing such basis and exactly determine the $CPT$ violation parameter by comparing the time dependence of the cascade decays of tagged $P^{\circ}$ and tagged $\bar{P^{\circ}}$. |
hep-ph/0307234 | Wolfgang Ochs | Matthew A. Buican, Clemens F"orster, Wolfgang Ochs | QCD explanation of oscillating hadron and jet multiplicity moments | 31 pages, 14 figures | Eur.Phys.J.C31:57-71,2003 | 10.1140/epjc/s2003-01315-1 | MPP-2003-36 | hep-ph | null | Ratios of multiplicity moments, H_q (cumulant over factorial moments
K_q/F_q), have been observed to show an oscillatory behaviour with respect to
order, q. Recent studies of e^+e^- annihilations at LEP have shown, moreover,
that the amplitude and oscillation length vary strongly with the jet resolution
parameter y_{cut}. We study the predictions of the perturbative QCD parton
cascade assuming low non-perturbative cut-off (Q_0\sim \Lambda_{QCD}\sim few
100 MeV) and derive the expectations as a function of the cms energy and jet
resolution from threshold to very high energies. We consider numerical
solutions of the evolution equations of gluodynamics in Double Logarithmic and
Modified Leading Logarithmic Approximations (DLA,MLLA), as well as results from
a parton MC with readjusted parameters. The main characteristics are obtained
in MLLA, while a more numerically accurate description is obtained by the MC
model. A unified description of correlations between hadrons and correlations
between jets emerges, in particular for the transition region of small y_{cut}.
| [
{
"created": "Fri, 18 Jul 2003 11:35:40 GMT",
"version": "v1"
}
] | 2011-07-19 | [
[
"Buican",
"Matthew A.",
""
],
[
"F\"orster",
"Clemens",
""
],
[
"Ochs",
"Wolfgang",
""
]
] | Ratios of multiplicity moments, H_q (cumulant over factorial moments K_q/F_q), have been observed to show an oscillatory behaviour with respect to order, q. Recent studies of e^+e^- annihilations at LEP have shown, moreover, that the amplitude and oscillation length vary strongly with the jet resolution parameter y_{cut}. We study the predictions of the perturbative QCD parton cascade assuming low non-perturbative cut-off (Q_0\sim \Lambda_{QCD}\sim few 100 MeV) and derive the expectations as a function of the cms energy and jet resolution from threshold to very high energies. We consider numerical solutions of the evolution equations of gluodynamics in Double Logarithmic and Modified Leading Logarithmic Approximations (DLA,MLLA), as well as results from a parton MC with readjusted parameters. The main characteristics are obtained in MLLA, while a more numerically accurate description is obtained by the MC model. A unified description of correlations between hadrons and correlations between jets emerges, in particular for the transition region of small y_{cut}. |
0812.2362 | Gregory Soyez | Gregory Soyez | Recent progress in defining jets | 10 pages, 6 figures. Contribution to the Ringberg Workshop New Trends
in HERA Physics 2008, October 5-10 2008, Ringberg Castle, Tegernsee, Germany | null | 10.1016/j.nuclphysbps.2009.03.120 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | From dedicated QCD studies to new physics background estimation, jets will be
everywhere at the LHC. In these proceedings, we discuss two important recent
series of improvements.
In the first one, we introduce new algorithms and new implementations of
previously existing algorithms, in order to cure limitations of their
predecessors and to satisfy fundamental requirements.
In the second part, we show that it is of prime importance to carefully
choose the jet definition (algorithm and parameters) to optimise kinematic
reconstructions at the LHC. Noticeably, we show that while at scales around 100
GeV, R~0.5 is an appropriate choice, clustering at the TeV scale requires R~1
for optimal efficiency. We finally show that our results are valid in the
presence of pileup, provided that a subtraction procedure is applied.
| [
{
"created": "Fri, 12 Dec 2008 12:25:07 GMT",
"version": "v1"
}
] | 2015-05-13 | [
[
"Soyez",
"Gregory",
""
]
] | From dedicated QCD studies to new physics background estimation, jets will be everywhere at the LHC. In these proceedings, we discuss two important recent series of improvements. In the first one, we introduce new algorithms and new implementations of previously existing algorithms, in order to cure limitations of their predecessors and to satisfy fundamental requirements. In the second part, we show that it is of prime importance to carefully choose the jet definition (algorithm and parameters) to optimise kinematic reconstructions at the LHC. Noticeably, we show that while at scales around 100 GeV, R~0.5 is an appropriate choice, clustering at the TeV scale requires R~1 for optimal efficiency. We finally show that our results are valid in the presence of pileup, provided that a subtraction procedure is applied. |
1510.01912 | Walter Grimus | R.M. Fonseca, W. Grimus | Roots of unity and lepton mixing patterns from finite flavour symmetries | 6 pages, no figures, talk presented at XXXIX International Conference
of Theoretical Physics "Matter to the Deepest," Ustron, Poland, September
13-18, 2015 | null | 10.5506/APhysPolB.46.2407 | UWThPh-2015-25, IFIC/15-78 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The classification of lepton mixing matrices from finite residual symmetries
is reviewed, with emphasis on the role of vanishing sums of roots of unity for
the solution of this problem.
| [
{
"created": "Wed, 7 Oct 2015 12:09:44 GMT",
"version": "v1"
}
] | 2016-01-20 | [
[
"Fonseca",
"R. M.",
""
],
[
"Grimus",
"W.",
""
]
] | The classification of lepton mixing matrices from finite residual symmetries is reviewed, with emphasis on the role of vanishing sums of roots of unity for the solution of this problem. |
hep-ph/9703355 | Michael Spira | Michael Spira | Higgs Boson Production at the LHC | 10 pages, latex, 4 figures | null | null | CERN-TH/97-35 | hep-ph | null | Recent theoretical progress in the evaluation of Higgs boson production at
the LHC within the Standard Model and its minimal supersymmetric extension is
reviewed. In particular the two-loop QCD corrections to the squark loop
contributions to scalar Higgs production in the MSSM and soft gluon resummation
effects in Standard and SUSY Higgs production via the gluon fusion mechanism
are discussed.
| [
{
"created": "Tue, 18 Mar 1997 14:50:13 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Spira",
"Michael",
""
]
] | Recent theoretical progress in the evaluation of Higgs boson production at the LHC within the Standard Model and its minimal supersymmetric extension is reviewed. In particular the two-loop QCD corrections to the squark loop contributions to scalar Higgs production in the MSSM and soft gluon resummation effects in Standard and SUSY Higgs production via the gluon fusion mechanism are discussed. |
hep-ph/9605388 | Bodenmueller | Harald Fritzsch | The Quark Mass Problem and CP-Violation | 11 latex pages | null | null | MPI-PhT/96-34 | hep-ph | null | A simple breaking of the subnuclear democracy among the quarks leads to a
mixing between the second and the third family, in agreement with observation.
Introducing the mixing between the first and the second family, one finds an
interesting pattern of maximal CP-violation as well as a complete determination
of the elements of the CKM matrix and of the unitarity triangles.
| [
{
"created": "Fri, 24 May 1996 10:21:17 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Fritzsch",
"Harald",
""
]
] | A simple breaking of the subnuclear democracy among the quarks leads to a mixing between the second and the third family, in agreement with observation. Introducing the mixing between the first and the second family, one finds an interesting pattern of maximal CP-violation as well as a complete determination of the elements of the CKM matrix and of the unitarity triangles. |
1001.0369 | Alexei Nefediev | V. Baru, C. Hanhart, Yu.S. Kalashnikova, A.E. Kudryavtsev, A.V.
Nefediev | Interplay of quark and meson degrees of freedom in a near-threshold
resonance | LaTeX2e, 11 pages, minor typo corrections, to appear in Eur.Phys.J.A | Eur.Phys.J.A44:93-103,2010 | 10.1140/epja/i2010-10929-7 | FZJ-IKP(TH)-2009-39 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We investigate the interplay of quark and meson degrees of freedom in a
physical state representing a near-threshold resonance for the case of a single
continuum channel. We demonstrate that such a near-threshold resonance may
possess quite peculiar properties if both quark and meson dynamics generate
weakly coupled near-threshold poles in the S-matrix. In particular, the
scattering t-matrix may possess zeros in this case. We also discuss possible
implications for production reactions as well as studies within lattice QCD.
| [
{
"created": "Sun, 3 Jan 2010 13:20:12 GMT",
"version": "v1"
},
{
"created": "Mon, 25 Jan 2010 13:30:22 GMT",
"version": "v2"
},
{
"created": "Wed, 3 Feb 2010 12:08:54 GMT",
"version": "v3"
}
] | 2010-04-30 | [
[
"Baru",
"V.",
""
],
[
"Hanhart",
"C.",
""
],
[
"Kalashnikova",
"Yu. S.",
""
],
[
"Kudryavtsev",
"A. E.",
""
],
[
"Nefediev",
"A. V.",
""
]
] | We investigate the interplay of quark and meson degrees of freedom in a physical state representing a near-threshold resonance for the case of a single continuum channel. We demonstrate that such a near-threshold resonance may possess quite peculiar properties if both quark and meson dynamics generate weakly coupled near-threshold poles in the S-matrix. In particular, the scattering t-matrix may possess zeros in this case. We also discuss possible implications for production reactions as well as studies within lattice QCD. |
1511.04040 | Sally Dawson | S. Dawson | Progress in Electroweak Symmetry Breaking | Contribution to Lepton-Photon Conference, 2015, 15 pages | null | null | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this talk, I discuss theoretical advances in understanding the properties
of the Higgs boson and the implications for models of electroweak symmetry
breaking. I begin by reviewing some of the recent progress in Standard Model
calculations for Higgs boson production and decay rates, followed by a
lightning tour of the use of effective field theories in the search for new
physics in the Higgs sector. I end with a discussion of the complementarity of
precision Higgs coupling measurements and direct searches for heavy particles
for the discovery of Beyond the Standard Model physics in the electroweak
sector.
| [
{
"created": "Thu, 12 Nov 2015 20:07:33 GMT",
"version": "v1"
}
] | 2015-11-13 | [
[
"Dawson",
"S.",
""
]
] | In this talk, I discuss theoretical advances in understanding the properties of the Higgs boson and the implications for models of electroweak symmetry breaking. I begin by reviewing some of the recent progress in Standard Model calculations for Higgs boson production and decay rates, followed by a lightning tour of the use of effective field theories in the search for new physics in the Higgs sector. I end with a discussion of the complementarity of precision Higgs coupling measurements and direct searches for heavy particles for the discovery of Beyond the Standard Model physics in the electroweak sector. |
2007.01826 | Victor Goncalves | V. P. Goncalves, D. E. Martins, M. S. Rangel | Diffractive $\gamma \gamma$ production in $pp$ collisions at the LHC | 7 pages, 4 figures, 3 tables. Improved version to be published in
EPJC. arXiv admin note: text overlap with arXiv:2002.03902 | null | 10.1140/epjc/s10052-020-8393-9 | null | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this letter we estimate the contribution of the double diffractive
processes for the diphoton production in $pp$ collisions at the Large Hadron
Collider (LHC). The acceptance of the central and forward LHC detectors is
taken into account and predictions for the invariant mass, rapidity and,
transverse momentum distributions are presented. A comparison with the
predictions for the Light -- by -- Light (LbL) scattering and exclusive
diphoton production is performed. We demonstrate that the events associated to
double diffractive processes can be separated and its study can be used to
constrain the behavior of the diffractive parton distribution functions.
| [
{
"created": "Thu, 2 Jul 2020 12:36:03 GMT",
"version": "v1"
},
{
"created": "Mon, 24 Aug 2020 12:37:28 GMT",
"version": "v2"
}
] | 2020-10-28 | [
[
"Goncalves",
"V. P.",
""
],
[
"Martins",
"D. E.",
""
],
[
"Rangel",
"M. S.",
""
]
] | In this letter we estimate the contribution of the double diffractive processes for the diphoton production in $pp$ collisions at the Large Hadron Collider (LHC). The acceptance of the central and forward LHC detectors is taken into account and predictions for the invariant mass, rapidity and, transverse momentum distributions are presented. A comparison with the predictions for the Light -- by -- Light (LbL) scattering and exclusive diphoton production is performed. We demonstrate that the events associated to double diffractive processes can be separated and its study can be used to constrain the behavior of the diffractive parton distribution functions. |
1608.00468 | Zhiguang Xiao | Zhiguang Xiao, Zhi-Yong Zhou | Virtual states and generalized completeness relation in the Friedrichs
Model | 15 pages, 8 figures; Minor modifications, imporved figures, version
to appear in Phys. Rev. D | Phys. Rev. D 94, 076006 (2016) | 10.1103/PhysRevD.94.076006 | ICTS-USTC-16-13 | hep-ph math-ph math.MP nucl-th quant-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the well-known Friedrichs model, in which a discrete state is
coupled to a continuum state. By examining the pole behaviors of the Friedrichs
model in a specific form factor thoroughly, we find that, in general, when the
bare discrete state is below the threshold of the continuum state, there should
also be a virtual-state pole accompanying the bound-state pole originating from
the bare discrete state as the coupling is turned on. There are also other
second-sheet poles originating from the singularities of the form factor. We
give a general argument for the existence of these two kinds of states. As the
coupling is increased to a certain value, the second-sheet poles may merge and
become higher-order poles. We then discuss the completeness relations
incorporating bound states, virtual states, and resonant states corresponding
to higher-order poles.
| [
{
"created": "Mon, 1 Aug 2016 15:19:26 GMT",
"version": "v1"
},
{
"created": "Mon, 24 Oct 2016 03:48:11 GMT",
"version": "v2"
}
] | 2016-11-02 | [
[
"Xiao",
"Zhiguang",
""
],
[
"Zhou",
"Zhi-Yong",
""
]
] | We study the well-known Friedrichs model, in which a discrete state is coupled to a continuum state. By examining the pole behaviors of the Friedrichs model in a specific form factor thoroughly, we find that, in general, when the bare discrete state is below the threshold of the continuum state, there should also be a virtual-state pole accompanying the bound-state pole originating from the bare discrete state as the coupling is turned on. There are also other second-sheet poles originating from the singularities of the form factor. We give a general argument for the existence of these two kinds of states. As the coupling is increased to a certain value, the second-sheet poles may merge and become higher-order poles. We then discuss the completeness relations incorporating bound states, virtual states, and resonant states corresponding to higher-order poles. |
2107.12789 | Tanmoy Modak | Tanmoy Modak, Eibun Senaha | Electroweak baryogenesis via bottom transport: complementarity between
LHC and future lepton collider probes | matches published version | Phys.Lett.B 822 (2021) 136695 | 10.1016/j.physletb.2021.136695 | null | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the complementarity between the Large Hadron Collider (LHC) and
future lepton colliders in probing electroweak baryogenesis induced by an
additional bottom Yukawa coupling $\rho_{bb}$. The context is general two Higgs
doublet model (g2HDM) where such additional bottom Yukawa coupling can account
for the observed baryon asymmetry of the Universe if $\mbox{Im}(\rho_{bb})
\gtrsim 0.058$. We find that LHC would probe the nominal $\mbox{Im}(\rho_{bb})$
required for baryogenesis to some extent via $bg \to bA \to bZh$ process if
$300~\mbox{GeV}\lesssim m_A \lesssim 450$ GeV, where $A$ is the CP-odd scalar
in g2HDM. We show that future electron positron collider such as International
Linear Collider with $500$ GeV and 1 TeV collision energies may offer unique
probe for the nominal $\mbox{Im}(\rho_{bb})$ via $e^+ e^- \to Z^*\to A H$
process followed by $A,H \to b \bar b$ decays in four $b$-jets signature. For
complementarity we also study the resonant diHiggs productions, which may give
an insight into strong first-order electroweak phase transition, via $e^+ e^-
\to Z^*\to A H \to A h h$ process in six $b$-jets signature. We find that 1 TeV
collision energy with $\mathcal{O}(1)~\text{ab}^{-1}$ integrated luminosity
could offer an ideal environment for the discovery.
| [
{
"created": "Tue, 27 Jul 2021 13:02:45 GMT",
"version": "v1"
},
{
"created": "Sat, 2 Oct 2021 15:20:43 GMT",
"version": "v2"
}
] | 2021-10-05 | [
[
"Modak",
"Tanmoy",
""
],
[
"Senaha",
"Eibun",
""
]
] | We study the complementarity between the Large Hadron Collider (LHC) and future lepton colliders in probing electroweak baryogenesis induced by an additional bottom Yukawa coupling $\rho_{bb}$. The context is general two Higgs doublet model (g2HDM) where such additional bottom Yukawa coupling can account for the observed baryon asymmetry of the Universe if $\mbox{Im}(\rho_{bb}) \gtrsim 0.058$. We find that LHC would probe the nominal $\mbox{Im}(\rho_{bb})$ required for baryogenesis to some extent via $bg \to bA \to bZh$ process if $300~\mbox{GeV}\lesssim m_A \lesssim 450$ GeV, where $A$ is the CP-odd scalar in g2HDM. We show that future electron positron collider such as International Linear Collider with $500$ GeV and 1 TeV collision energies may offer unique probe for the nominal $\mbox{Im}(\rho_{bb})$ via $e^+ e^- \to Z^*\to A H$ process followed by $A,H \to b \bar b$ decays in four $b$-jets signature. For complementarity we also study the resonant diHiggs productions, which may give an insight into strong first-order electroweak phase transition, via $e^+ e^- \to Z^*\to A H \to A h h$ process in six $b$-jets signature. We find that 1 TeV collision energy with $\mathcal{O}(1)~\text{ab}^{-1}$ integrated luminosity could offer an ideal environment for the discovery. |
2004.03285 | Daniel Baranowski | Daniel Baranowski | NNLO zero-jettiness beam and soft functions to higher orders in the
dimensional-regularization parameter $\epsilon$ | 26 pages, 1 figure | null | 10.1140/epjc/s10052-020-8047-y | P3H-20-006, TTP20-004 | hep-ph | http://creativecommons.org/licenses/by-sa/4.0/ | We present the calculation of the next-to-next-to-leading order (NNLO)
zero-jettiness beam and soft functions, up to the second order in the expansion
in the dimensional regularization parameter $\epsilon$. These higher order
terms are needed for the computation of the next-to-next-to-next-to-leading
order (N$^3$LO) zero-jettiness soft and beam functions. As a byproduct, we
confirm the $O(\epsilon^0)$ results for NNLO beam and soft functions available
in the literature.
| [
{
"created": "Tue, 7 Apr 2020 11:44:14 GMT",
"version": "v1"
}
] | 2020-07-15 | [
[
"Baranowski",
"Daniel",
""
]
] | We present the calculation of the next-to-next-to-leading order (NNLO) zero-jettiness beam and soft functions, up to the second order in the expansion in the dimensional regularization parameter $\epsilon$. These higher order terms are needed for the computation of the next-to-next-to-next-to-leading order (N$^3$LO) zero-jettiness soft and beam functions. As a byproduct, we confirm the $O(\epsilon^0)$ results for NNLO beam and soft functions available in the literature. |
hep-ph/9612223 | Hai-Yang Cheng | Hai-Yang Cheng | Nonleptonic Weak Decays of Bottom Baryons | 24 pages, to appear in Phys. Rev. Uncertainties with form factor q^2
dependence are discussed | Phys.Rev. D56 (1997) 2799-2811 | 10.1103/PhysRevD.56.2799 | IP-ASTP-06-96 | hep-ph | null | Cabibbo-allowed two-body hadronic weak decays of bottom baryons are analyzed.
Contrary to the charmed baryon sector, many channels of bottom baryon decays
proceed only through the external or internal W-emission diagrams. Moreover,
W-exchange is likely to be suppressed in the bottom baryon sector.
Consequently, the factorization approach suffices to describe most of the
Cabibbo-allowed bottom baryon decays. We use the nonrelativistic quark model to
evaluate heavy-to-heavy and heavy-to-light baryon form factors at zero recoil.
When applied to the heavy quark limit, the quark model results do satisfy all
the constraints imposed by heavy quark symmetry. The decay rates and up-down
asymmetries for bottom baryons decaying into $(1/2)^++P(V)$ and $(3/2)^++P(V)$
are calculated. It is found that the up-down asymmetry is negative except for
$\Omega_b \to (1/2)^++P(V)$ decay and for decay modes with $\psi'$ in the final
state. The prediction $B(\Lambda_b \to J/\psi\Lambda)=1.6 \times 10^{-4}$ for
$|V_{cb}|=0.038$ is consistent with the recent CDF measurement. We also present
estimates for $\Omega_c \to (3/2)^++P(V)$ decays and compare with various model
calculations.
| [
{
"created": "Mon, 2 Dec 1996 06:04:11 GMT",
"version": "v1"
},
{
"created": "Thu, 12 Jun 1997 22:52:01 GMT",
"version": "v2"
}
] | 2009-10-30 | [
[
"Cheng",
"Hai-Yang",
""
]
] | Cabibbo-allowed two-body hadronic weak decays of bottom baryons are analyzed. Contrary to the charmed baryon sector, many channels of bottom baryon decays proceed only through the external or internal W-emission diagrams. Moreover, W-exchange is likely to be suppressed in the bottom baryon sector. Consequently, the factorization approach suffices to describe most of the Cabibbo-allowed bottom baryon decays. We use the nonrelativistic quark model to evaluate heavy-to-heavy and heavy-to-light baryon form factors at zero recoil. When applied to the heavy quark limit, the quark model results do satisfy all the constraints imposed by heavy quark symmetry. The decay rates and up-down asymmetries for bottom baryons decaying into $(1/2)^++P(V)$ and $(3/2)^++P(V)$ are calculated. It is found that the up-down asymmetry is negative except for $\Omega_b \to (1/2)^++P(V)$ decay and for decay modes with $\psi'$ in the final state. The prediction $B(\Lambda_b \to J/\psi\Lambda)=1.6 \times 10^{-4}$ for $|V_{cb}|=0.038$ is consistent with the recent CDF measurement. We also present estimates for $\Omega_c \to (3/2)^++P(V)$ decays and compare with various model calculations. |
hep-ph/9907414 | R. Sekhar Chivukula | R. Sekhar Chivukula and Nick Evans | Triviality and the Precision Bound on the Higgs Mass | 9 pages, 3 epsf figures included | Phys.Lett. B464 (1999) 244-248 | 10.1016/S0370-2693(99)00972-7 | BUHEP-99-15 | hep-ph | null | The triviality of the scalar sector of the standard one-doublet Higgs model
implies that this model is only an effective low-energy theory valid below some
cut-off scale Lambda. For a heavy higgs this scale must be relatively low (10
TeV or less). Additional interactions coming from the underlying theory, and
suppressed by the scale Lambda, give rise to model-dependent corrections to
precisely measured electroweak quantities. Dimension six operators arising from
the underlying physics naturally contribute to the S and T parameters, and
their effects should be included in a global fit to the precision data that
determines any limit on the Higgs mass. Using dimensional analysis, we estimate
the expected size of these corrections in a custodially-symmetric
strongly-interacting underlying theory. Taking these operators' coefficients to
be of natural size gives sufficiently large contributions to the T parameter to
reconcile Higgs masses as large as 400-500 GeV with the precision data.
| [
{
"created": "Mon, 19 Jul 1999 16:02:40 GMT",
"version": "v1"
}
] | 2009-10-31 | [
[
"Chivukula",
"R. Sekhar",
""
],
[
"Evans",
"Nick",
""
]
] | The triviality of the scalar sector of the standard one-doublet Higgs model implies that this model is only an effective low-energy theory valid below some cut-off scale Lambda. For a heavy higgs this scale must be relatively low (10 TeV or less). Additional interactions coming from the underlying theory, and suppressed by the scale Lambda, give rise to model-dependent corrections to precisely measured electroweak quantities. Dimension six operators arising from the underlying physics naturally contribute to the S and T parameters, and their effects should be included in a global fit to the precision data that determines any limit on the Higgs mass. Using dimensional analysis, we estimate the expected size of these corrections in a custodially-symmetric strongly-interacting underlying theory. Taking these operators' coefficients to be of natural size gives sufficiently large contributions to the T parameter to reconcile Higgs masses as large as 400-500 GeV with the precision data. |
hep-ph/0111320 | Neil Russell | Neil Russell | CPT and Lorentz Tests with Clocks in Space | 10 pages, presented at the Second Meeting on CPT and Lorentz
Symmetry, Bloomington, Indiana, August 2001. One additional reference | null | 10.1142/9789812778123_0013 | null | hep-ph | null | Space-based clock-comparison experiments can provide Planck-scale sensitivity
to many parameters for Lorentz and CPT violation that are difficult to measure
on Earth. The principal advantages are a reduced timescale for data collection,
reduced suppression for certain effects, and access to certain parameters not
possible with Earth-based experiments.
| [
{
"created": "Sat, 24 Nov 2001 18:29:18 GMT",
"version": "v1"
},
{
"created": "Wed, 5 Dec 2001 02:09:08 GMT",
"version": "v2"
}
] | 2017-08-23 | [
[
"Russell",
"Neil",
""
]
] | Space-based clock-comparison experiments can provide Planck-scale sensitivity to many parameters for Lorentz and CPT violation that are difficult to measure on Earth. The principal advantages are a reduced timescale for data collection, reduced suppression for certain effects, and access to certain parameters not possible with Earth-based experiments. |
hep-ph/9805418 | Helmut Satz | Helmut Satz | Deconfinement and Percolation | 13 pages, latex, six figures included | Nucl.Phys.A642:130-142,1998 | 10.1016/S0375-9474(98)00508-9 | BI-TP 98/11 | hep-ph | null | Using percolation theory, we derive a conceptual definition of deconfinement
in terms of cluster formation. The result is readily applicable to infinite
volume equilibrium matter as well as to finite size pre-equilibrium systems in
nuclear collisions.
| [
{
"created": "Fri, 22 May 1998 00:04:06 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Satz",
"Helmut",
""
]
] | Using percolation theory, we derive a conceptual definition of deconfinement in terms of cluster formation. The result is readily applicable to infinite volume equilibrium matter as well as to finite size pre-equilibrium systems in nuclear collisions. |
0708.0008 | Aron Bernstein | A.M. Bernstein and C.N. Papanicolas | Ovrview: The Shape of Hadrons | null | AIP Conf.Proc.904:1-22,2007 | 10.1063/1.2734399 | null | hep-ph hep-ex nucl-ex nucl-th | null | In this article we address the physical basis of the deviation of hadron
shapes from spherical symmetry (non-spherical amplitudes) with focus on the
nucleon and $\Delta$. An overview of both the experimental methods and results
and the current theoretical understanding of the issue is presented. At the
present time the most quantitative method is the $\gamma^{*} p \to \Delta$
reaction for which significant non-spherical electric (E2) and Coulomb
quadrupole (C2) amplitudes have been observed with good precision as a function
of Q^{2} from the photon point through 6 GeV^{2}. Quark model calculations for
these quadrupole amplitudes are at least an order of magnitude too small and
even have the wrong sign. Lattice QCD, chiral effective field theory, and
dynamic model calculations which include the effects of the pion-cloud are in
approximate agreement with experiment. This is expected due to the spontaneous
breaking of chiral symmetry in QCD and the resulting, long range (low Q^{2})
effects of the pion-cloud. Other observables such as nucleon form factors and
virtual Compton scattering experiments indicate that the pion-cloud is playing
a significant role in nucleon structure. Semi-inclusive deep inelastic
scattering experiments with transverse polarized beam and target also show the
effect of non-zero quark angular momentum.
| [
{
"created": "Tue, 31 Jul 2007 20:04:29 GMT",
"version": "v1"
}
] | 2009-01-06 | [
[
"Bernstein",
"A. M.",
""
],
[
"Papanicolas",
"C. N.",
""
]
] | In this article we address the physical basis of the deviation of hadron shapes from spherical symmetry (non-spherical amplitudes) with focus on the nucleon and $\Delta$. An overview of both the experimental methods and results and the current theoretical understanding of the issue is presented. At the present time the most quantitative method is the $\gamma^{*} p \to \Delta$ reaction for which significant non-spherical electric (E2) and Coulomb quadrupole (C2) amplitudes have been observed with good precision as a function of Q^{2} from the photon point through 6 GeV^{2}. Quark model calculations for these quadrupole amplitudes are at least an order of magnitude too small and even have the wrong sign. Lattice QCD, chiral effective field theory, and dynamic model calculations which include the effects of the pion-cloud are in approximate agreement with experiment. This is expected due to the spontaneous breaking of chiral symmetry in QCD and the resulting, long range (low Q^{2}) effects of the pion-cloud. Other observables such as nucleon form factors and virtual Compton scattering experiments indicate that the pion-cloud is playing a significant role in nucleon structure. Semi-inclusive deep inelastic scattering experiments with transverse polarized beam and target also show the effect of non-zero quark angular momentum. |
hep-ph/9208245 | null | R. Holman, S.D.H. Hsu, T. Vachaspati and R. Watkins | Metastable Cosmic Strings in Realistic Models | 24 pages, 2 figures (available on request); HUTP-92/A032,
Fermilab-Pub-92/228-A | Phys.Rev.D46:5352-5359,1992 | 10.1103/PhysRevD.46.5352 | null | hep-ph | null | We investigate the stability of the electroweak Z-string at high
temperatures. Our results show that while finite temperature corrections can
improve the stability of the Z-string, their effect is not strong enough to
stabilize the Z-string in the standard electroweak model. Consequently, the
Z-string will be unstable even under the conditions present during the
electroweak phase transition. We then consider phenomenologically viable models
based on the gauge group $SU(2)_L \times SU(2)_R \times U(1)_{B-L}$ and show
that metastable strings exist and are stable to small perturbations for a large
region of the parameter space for these models. We also show that these strings
are superconducting with bosonic charge carriers. The string superconductivity
may be able to stabilize segments and loops against dynamical contraction.
Possible implications of these strings for cosmology are discussed.
| [
{
"created": "Tue, 25 Aug 1992 15:05:41 GMT",
"version": "v1"
}
] | 2011-07-19 | [
[
"Holman",
"R.",
""
],
[
"Hsu",
"S. D. H.",
""
],
[
"Vachaspati",
"T.",
""
],
[
"Watkins",
"R.",
""
]
] | We investigate the stability of the electroweak Z-string at high temperatures. Our results show that while finite temperature corrections can improve the stability of the Z-string, their effect is not strong enough to stabilize the Z-string in the standard electroweak model. Consequently, the Z-string will be unstable even under the conditions present during the electroweak phase transition. We then consider phenomenologically viable models based on the gauge group $SU(2)_L \times SU(2)_R \times U(1)_{B-L}$ and show that metastable strings exist and are stable to small perturbations for a large region of the parameter space for these models. We also show that these strings are superconducting with bosonic charge carriers. The string superconductivity may be able to stabilize segments and loops against dynamical contraction. Possible implications of these strings for cosmology are discussed. |
hep-ph/0304259 | Jan Kalinowski | W. Krolikowski | Is there a dynamical group structure behind the bilarge form of neutrino
mixing matrix? | 1+9 pages, latex, no figures | Acta Phys.Polon. B34 (2003) 4157-4166 | null | IFT-03/10 | hep-ph | null | We observe that the {\it invariance} of neutrino mixing matrix under the
simultaneous discrete transformations $\nu_1, \nu_2, \nu_3 \to -\nu_1, -\nu_2,
\nu_3 $ and $\nu_e, \nu_\mu, \nu_\tau \to -\nu_e, \nu_\tau, \nu_\mu $ (neutrino
"horizontal conjugation") {\it characterizes} (as a sufficient condition for
it) the familiar bilarge form of neutrino mixing matrix, favored experimentally
at present. Thus, the mass neutrinos $\nu_1, \nu_2, \nu_3 $ get a new quantum
number, {\it covariant} with respect to their mixings into the flavor neutrinos
$\nu_e, \nu_\mu, \nu_\tau $ (neutrino "horizontal parity" equal to -1, -1,1,
respectively). The "horizontal parity" turns out to be embedded in a group
structure consisting of some Hermitian and real $3\times 3$ matrices $\mu_1,
\mu_2, \mu_3 $ and $\phi_1, \phi_2, \phi_3 $, forming pairs interconnected
through neutrino mixings. They generate some discrete transformations of mass
and flavor neutrinos, respectively, in such a way that the group relations
$\mu_1 \mu_2 = \mu_3 $ (cyclic) and $\phi_1 \phi_2 = \phi_3 $ (cyclic) hold,
while $\mu_a \mu_b = \mu_b \mu_a $ and $\phi_a \phi_b = \phi_b \phi_a $. Then,
for instance, the $\mu_3$ matrix may be chosen equal to the "horizontal
parity".
| [
{
"created": "Mon, 28 Apr 2003 09:04:14 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Krolikowski",
"W.",
""
]
] | We observe that the {\it invariance} of neutrino mixing matrix under the simultaneous discrete transformations $\nu_1, \nu_2, \nu_3 \to -\nu_1, -\nu_2, \nu_3 $ and $\nu_e, \nu_\mu, \nu_\tau \to -\nu_e, \nu_\tau, \nu_\mu $ (neutrino "horizontal conjugation") {\it characterizes} (as a sufficient condition for it) the familiar bilarge form of neutrino mixing matrix, favored experimentally at present. Thus, the mass neutrinos $\nu_1, \nu_2, \nu_3 $ get a new quantum number, {\it covariant} with respect to their mixings into the flavor neutrinos $\nu_e, \nu_\mu, \nu_\tau $ (neutrino "horizontal parity" equal to -1, -1,1, respectively). The "horizontal parity" turns out to be embedded in a group structure consisting of some Hermitian and real $3\times 3$ matrices $\mu_1, \mu_2, \mu_3 $ and $\phi_1, \phi_2, \phi_3 $, forming pairs interconnected through neutrino mixings. They generate some discrete transformations of mass and flavor neutrinos, respectively, in such a way that the group relations $\mu_1 \mu_2 = \mu_3 $ (cyclic) and $\phi_1 \phi_2 = \phi_3 $ (cyclic) hold, while $\mu_a \mu_b = \mu_b \mu_a $ and $\phi_a \phi_b = \phi_b \phi_a $. Then, for instance, the $\mu_3$ matrix may be chosen equal to the "horizontal parity". |
2407.10604 | Jiabao Liu | Jiabao Liu, Hiroki Nagakura, Ryuichiro Akaho, Akira Ito, Masamichi
Zaizen, Shun Furusawa, Shoichi Yamada | Muon-induced collisional flavor instability in core-collapse supernova | null | null | null | null | hep-ph astro-ph.HE | http://creativecommons.org/licenses/by/4.0/ | Neutrinos are known to undergo flavor conversion among their three flavors.
In the theoretical modeling of core-collapse supernova (CCSN), there has been a
great deal of attention to recent discoveries of a new type of neutrino flavor
conversions, namely collisional flavor instability (CFI), in which the
instability is induced by the flavor-dependent decoherence due to the disparity
of neutrino-matter interactions among flavors. In this paper, we study how the
appearance of on-shell muons and associated neutrino-matter interactions can
impact CFIs based on linear stability analysis of flavor conversions. Some
striking results emerge from the present study. First, we analytically show
that breaking beta- and pair equilibrium is a necessary condition to trigger
CFIs. This also indicates that CFIs with on-shell muons could appear in $e
\tau$ and $\mu \tau$ neutrino mixing sectors in very high-density region
($\gtrsim 10^{13} {\rm g/cm^{3}}$), exhibiting a possibility of large impacts
of CFIs on CCSN. Second, resonance-like CFIs, having a much higher growth rate
than normal CFIs, can be triggered by muons. The resonance point of CFIs is
different between $e \tau$ and $\mu \tau$ sectors; the former (latter) occurs
at $\mu_{e (\mu)} = \mu_{n} - \mu_{p}$, where $\mu_{i}$ denotes the chemical
potential of $i$ constitute ($n$ and $p$ represent neutrons and protons,
respectively). Our result suggests that the non-linear evolution of CFI with
on-shell muons would induce flavor conversions with the complex interplay among
all three different neutrino-mixing sectors.
| [
{
"created": "Mon, 15 Jul 2024 10:27:27 GMT",
"version": "v1"
}
] | 2024-07-17 | [
[
"Liu",
"Jiabao",
""
],
[
"Nagakura",
"Hiroki",
""
],
[
"Akaho",
"Ryuichiro",
""
],
[
"Ito",
"Akira",
""
],
[
"Zaizen",
"Masamichi",
""
],
[
"Furusawa",
"Shun",
""
],
[
"Yamada",
"Shoichi",
""
]
] | Neutrinos are known to undergo flavor conversion among their three flavors. In the theoretical modeling of core-collapse supernova (CCSN), there has been a great deal of attention to recent discoveries of a new type of neutrino flavor conversions, namely collisional flavor instability (CFI), in which the instability is induced by the flavor-dependent decoherence due to the disparity of neutrino-matter interactions among flavors. In this paper, we study how the appearance of on-shell muons and associated neutrino-matter interactions can impact CFIs based on linear stability analysis of flavor conversions. Some striking results emerge from the present study. First, we analytically show that breaking beta- and pair equilibrium is a necessary condition to trigger CFIs. This also indicates that CFIs with on-shell muons could appear in $e \tau$ and $\mu \tau$ neutrino mixing sectors in very high-density region ($\gtrsim 10^{13} {\rm g/cm^{3}}$), exhibiting a possibility of large impacts of CFIs on CCSN. Second, resonance-like CFIs, having a much higher growth rate than normal CFIs, can be triggered by muons. The resonance point of CFIs is different between $e \tau$ and $\mu \tau$ sectors; the former (latter) occurs at $\mu_{e (\mu)} = \mu_{n} - \mu_{p}$, where $\mu_{i}$ denotes the chemical potential of $i$ constitute ($n$ and $p$ represent neutrons and protons, respectively). Our result suggests that the non-linear evolution of CFI with on-shell muons would induce flavor conversions with the complex interplay among all three different neutrino-mixing sectors. |
hep-ph/0508214 | Iain W. Stewart | Christian M. Arnesen, Joydip Kundu, Iain W. Stewart | Constraint equations for heavy-to-light currents in SCET | 35 pages | Phys.Rev. D72 (2005) 114002 | 10.1103/PhysRevD.72.114002 | MIT-CTP-3667, DOE/ER/40762-347 | hep-ph | null | A complete basis for the next-to-next-to leading order heavy-to-light
currents in the soft-collinear effective theory is constructed.
Reparameterization invariance is imposed by deriving constraint equations.
Their solutions give the set of allowed Dirac structures as well as relations
between the Wilson coefficients of operators that appear at different orders in
the power expansion. The completeness of reparameterization invariance
constraints derived on a projected surface is investigated. We also discuss the
universality of the ultrasoft Wilson line with boundary conditions.
| [
{
"created": "Mon, 22 Aug 2005 18:43:13 GMT",
"version": "v1"
}
] | 2013-05-29 | [
[
"Arnesen",
"Christian M.",
""
],
[
"Kundu",
"Joydip",
""
],
[
"Stewart",
"Iain W.",
""
]
] | A complete basis for the next-to-next-to leading order heavy-to-light currents in the soft-collinear effective theory is constructed. Reparameterization invariance is imposed by deriving constraint equations. Their solutions give the set of allowed Dirac structures as well as relations between the Wilson coefficients of operators that appear at different orders in the power expansion. The completeness of reparameterization invariance constraints derived on a projected surface is investigated. We also discuss the universality of the ultrasoft Wilson line with boundary conditions. |
2007.11414 | Xiao-Yun Wang | Ya-Ping Xie, Xiao-Yun Wang, Xurong Chen | Production of vector mesons in pentaquark states resonance channel in
$p$-$A$ ultraperipheral collisions | 9 pages, 5 figures | null | 10.1088/1674-1137/abc245 | null | hep-ph | http://creativecommons.org/licenses/by/4.0/ | Ultraperipheral collisions (UPCs) of protons and nuclei are important for the
study of the photoproduction of vector mesons and exotic states. The
photoproduction of vector mesons in the pentaquark resonance channel in
$p\mbox{-}Au$ UPCs at the Relative Heavy Ion Collider (RHIC) and $p$-$Pb$ UPCs
at the Large Hadron Collider (LHC) is investigated by employing STARlight
package. The cross sections of vector mesons via pentaquark state resonances
channel are obtained using effective Lagrangian method. The pseudo-rapidity and
rapidity distributions of $J/\psi $ and $\Upsilon(1S) $ are given for
$p\mbox{-}Au$ UPCs at the RHIC and $p$-$Pb$ at the LHC. It is found that the
RHIC is a better platform for discovering the pentaquark states than the LHC.
Moreover, $P_{b}(11080)$ is easier to identify than $P_c(4312)$ because the
background of $\Upsilon (1S)$ is weaker than $J/\psi$ in the $t$-channel at the
RHIC.
| [
{
"created": "Wed, 22 Jul 2020 13:21:19 GMT",
"version": "v1"
},
{
"created": "Thu, 29 Oct 2020 08:35:50 GMT",
"version": "v2"
}
] | 2020-10-30 | [
[
"Xie",
"Ya-Ping",
""
],
[
"Wang",
"Xiao-Yun",
""
],
[
"Chen",
"Xurong",
""
]
] | Ultraperipheral collisions (UPCs) of protons and nuclei are important for the study of the photoproduction of vector mesons and exotic states. The photoproduction of vector mesons in the pentaquark resonance channel in $p\mbox{-}Au$ UPCs at the Relative Heavy Ion Collider (RHIC) and $p$-$Pb$ UPCs at the Large Hadron Collider (LHC) is investigated by employing STARlight package. The cross sections of vector mesons via pentaquark state resonances channel are obtained using effective Lagrangian method. The pseudo-rapidity and rapidity distributions of $J/\psi $ and $\Upsilon(1S) $ are given for $p\mbox{-}Au$ UPCs at the RHIC and $p$-$Pb$ at the LHC. It is found that the RHIC is a better platform for discovering the pentaquark states than the LHC. Moreover, $P_{b}(11080)$ is easier to identify than $P_c(4312)$ because the background of $\Upsilon (1S)$ is weaker than $J/\psi$ in the $t$-channel at the RHIC. |
1007.1887 | Bastian Kubis | Bastian Kubis, Rebekka Schmidt | Radiative corrections in K --> pi l+ l- decays | 12 pages, 9 figures; reference added, matches version published in
EPJC | Eur.Phys.J.C70:219-231,2010 | 10.1140/epjc/s10052-010-1442-z | HISKP-TH-10/17 | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We calculate radiative corrections to the flavor-changing neutral current
process K --> pi l+ l-, both for charged and neutral kaon decays. While the
soft-photon approximation is shown to work well for the muon channels, we
discuss the necessity of further phase space cuts with electrons in the final
state. It is also shown how to transfer our results to other decays such as eta
--> gamma l+ l- or omega --> pi0 l+ l-.
| [
{
"created": "Mon, 12 Jul 2010 12:34:19 GMT",
"version": "v1"
},
{
"created": "Sun, 21 Nov 2010 12:40:38 GMT",
"version": "v2"
}
] | 2010-11-23 | [
[
"Kubis",
"Bastian",
""
],
[
"Schmidt",
"Rebekka",
""
]
] | We calculate radiative corrections to the flavor-changing neutral current process K --> pi l+ l-, both for charged and neutral kaon decays. While the soft-photon approximation is shown to work well for the muon channels, we discuss the necessity of further phase space cuts with electrons in the final state. It is also shown how to transfer our results to other decays such as eta --> gamma l+ l- or omega --> pi0 l+ l-. |
2205.08088 | Dan Kondo | Dan Kondo, Robert McGehee, Tom Melia and Hitoshi Murayama | Linear Sigma Dark Matter | 30 pages, 13 figures; v2: minor revisions to match published version | JHEP09(2022)041 | 10.1007/JHEP09(2022)041 | null | hep-ph astro-ph.CO | http://creativecommons.org/licenses/by/4.0/ | We present a model of self-interacting dark matter based on QCD-like theories
and inspired by the proximity of $a_0(980\pm 20)$ to the $K\bar{K}(990)$
threshold. Dark matter is comprised of dark pions which self-scatter via the
$\sigma$ resonance close to the $\pi\pi$ threshold. While the linear sigma
model serves as a qualitative guide, a fully unitary description of the
scattering in the strongly coupled regime is given by effective range theory.
The introduction of a kinetically mixed dark photon allows the dark pion to
either freeze-out or -in. We study the viable parameter space which explains
the observed relic abundance while evading all current constraints. Searches
for dark matter self interactions at different scales, (in)direct detection
signals, and (in)visibly-decaying dark photons will test this model in the near
future.
| [
{
"created": "Tue, 17 May 2022 04:31:29 GMT",
"version": "v1"
},
{
"created": "Sun, 11 Sep 2022 05:29:03 GMT",
"version": "v2"
}
] | 2022-09-13 | [
[
"Kondo",
"Dan",
""
],
[
"McGehee",
"Robert",
""
],
[
"Melia",
"Tom",
""
],
[
"Murayama",
"Hitoshi",
""
]
] | We present a model of self-interacting dark matter based on QCD-like theories and inspired by the proximity of $a_0(980\pm 20)$ to the $K\bar{K}(990)$ threshold. Dark matter is comprised of dark pions which self-scatter via the $\sigma$ resonance close to the $\pi\pi$ threshold. While the linear sigma model serves as a qualitative guide, a fully unitary description of the scattering in the strongly coupled regime is given by effective range theory. The introduction of a kinetically mixed dark photon allows the dark pion to either freeze-out or -in. We study the viable parameter space which explains the observed relic abundance while evading all current constraints. Searches for dark matter self interactions at different scales, (in)direct detection signals, and (in)visibly-decaying dark photons will test this model in the near future. |
2111.11383 | Nazar Burmasov | Nazar Burmasov, Evgeny Kryshen, Paul Buehler, Roman Lavicka | Upcgen: a Monte Carlo simulation program for dilepton pair production in
ultra-peripheral collisions of heavy ions | 28 pages, 11 figures, to be submitted to Computer Physics
Communications | null | 10.1016/j.cpc.2022.108388 | null | hep-ph nucl-ex nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Ultra-peripheral collisions (UPCs) of heavy ions can be used as a clean
environment to study two-photon induced interactions such as dilepton pair
photoproduction. Recently, precise data on lepton pair production in UPCs were
obtained by the ATLAS experiment at the LHC where significant deviations, of up
to 20%, from available theoretical predictions were observed. In this work, we
present a Monte Carlo event generator, Upcgen, that implements a refined
treatment of the photon flux allowing us to improve the agreement with ATLAS
data at large dilepton rapidities. Besides, the new generator offers a
possibility to study photon polarization effects and set arbitrary values of
the lepton anomalous magnetic moment that can be used in the future studies of
tau g-2 via ditau production measurements in UPCs.
| [
{
"created": "Mon, 22 Nov 2021 17:47:15 GMT",
"version": "v1"
},
{
"created": "Thu, 3 Mar 2022 13:18:03 GMT",
"version": "v2"
}
] | 2022-05-18 | [
[
"Burmasov",
"Nazar",
""
],
[
"Kryshen",
"Evgeny",
""
],
[
"Buehler",
"Paul",
""
],
[
"Lavicka",
"Roman",
""
]
] | Ultra-peripheral collisions (UPCs) of heavy ions can be used as a clean environment to study two-photon induced interactions such as dilepton pair photoproduction. Recently, precise data on lepton pair production in UPCs were obtained by the ATLAS experiment at the LHC where significant deviations, of up to 20%, from available theoretical predictions were observed. In this work, we present a Monte Carlo event generator, Upcgen, that implements a refined treatment of the photon flux allowing us to improve the agreement with ATLAS data at large dilepton rapidities. Besides, the new generator offers a possibility to study photon polarization effects and set arbitrary values of the lepton anomalous magnetic moment that can be used in the future studies of tau g-2 via ditau production measurements in UPCs. |
hep-ph/9507399 | Kingman Cheung | Kingman Cheung and Robert J. Oakes | Strange-Beauty Meson Production at $p\bar p$ Colliders | Minor changes in the discussion section. Also available at
http://www.ph.utexas.edu/~cheung/paper.html | Phys.Rev. D53 (1996) 1242-1246 | 10.1103/PhysRevD.53.1242 | NUHEP-TH-95-07, CPP-95-11 | hep-ph hep-ex | null | The production rates and transverse momentum distributions of the
strange-beauty mesons $B_s$ and $B_s^*$ at $p\bar p$ colliders are calculated
assuming fragmentation is the dominant process. Results are given for the
Tevatron in the large transverse momentum region, where fragmentation is
expected to be most important.
| [
{
"created": "Mon, 24 Jul 1995 19:39:56 GMT",
"version": "v1"
},
{
"created": "Mon, 4 Dec 1995 19:28:33 GMT",
"version": "v2"
}
] | 2009-10-28 | [
[
"Cheung",
"Kingman",
""
],
[
"Oakes",
"Robert J.",
""
]
] | The production rates and transverse momentum distributions of the strange-beauty mesons $B_s$ and $B_s^*$ at $p\bar p$ colliders are calculated assuming fragmentation is the dominant process. Results are given for the Tevatron in the large transverse momentum region, where fragmentation is expected to be most important. |
2309.01773 | Stephan Narison | S. Li (Dept. Phys, Univ. Saskatchewan, CA), S. Narison (LUPM,
CNRS-In2P3, Univ. Montpellie, France), T. Steele (Dept. Phys, Univ.
Saskatchewan, CA), D. Rabetiarivony (iHEPMAD, Univ. Antananarivo, Madagascar) | $2^{++}$ Tensor Di-Gluonium from Laplace Sum Rules at NLO | 7 pages, 9 figures, 1 Table | null | null | null | hep-ph hep-ex hep-lat | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We evaluate the next-to-leading (NLO) corrections to the perturbative (PT)
and $< \alpha_s G^2>$ condensate and the LO constant term of the $< G^3 > $
contributions to the $2^{++}$ tensor di-gluonium two-point correlator. Using
these results into the inverse Laplace transform sum rules (LSR) moments and
their ratio, we estimate the mass and coupling of the lowest ground state. We
obtain\,: $M_T=3028(287)$ MeV and the renormalization group invariant (RGI)
coupling $\hat f_T=224(33)$ MeV within a vacuum saturation estimate of the
$D=8$ dimension gluon condensates ($k_G=1$). We study the effect of $k_G$ on
the result and find: $M_T=3188(337)$ MeV and $\hat f_T$=245(32) MeV for
$k_G=(3\pm 2)$. Our result does not favour the pure gluonia/glueball nature of
the observed $f_2(2010,2300,2340)$ states.
| [
{
"created": "Mon, 4 Sep 2023 19:25:27 GMT",
"version": "v1"
}
] | 2023-09-06 | [
[
"Li",
"S.",
"",
"Dept. Phys, Univ. Saskatchewan, CA"
],
[
"Narison",
"S.",
"",
"LUPM,\n CNRS-In2P3, Univ. Montpellie, France"
],
[
"Steele",
"T.",
"",
"Dept. Phys, Univ.\n Saskatchewan, CA"
],
[
"Rabetiarivony",
"D.",
"",
"iHEPMAD, Univ. Antananarivo, Madagascar"
]
] | We evaluate the next-to-leading (NLO) corrections to the perturbative (PT) and $< \alpha_s G^2>$ condensate and the LO constant term of the $< G^3 > $ contributions to the $2^{++}$ tensor di-gluonium two-point correlator. Using these results into the inverse Laplace transform sum rules (LSR) moments and their ratio, we estimate the mass and coupling of the lowest ground state. We obtain\,: $M_T=3028(287)$ MeV and the renormalization group invariant (RGI) coupling $\hat f_T=224(33)$ MeV within a vacuum saturation estimate of the $D=8$ dimension gluon condensates ($k_G=1$). We study the effect of $k_G$ on the result and find: $M_T=3188(337)$ MeV and $\hat f_T$=245(32) MeV for $k_G=(3\pm 2)$. Our result does not favour the pure gluonia/glueball nature of the observed $f_2(2010,2300,2340)$ states. |
2303.13438 | Tzihu\'e Cisneros P\'erez | T. Cisneros-P\'erez, M. A. Hern\'andez-Ru\'iz, A.
Guti\'errez-Rodr\'iguez and E. Cruz-Albaro | Flavor-changing top quark rare decays in the Bestest Little Higgs Model | 13 pages and 10 figures | null | null | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | This paper investigates the effects of parameters in the Bestest Little Higgs
Model (BLHM) on rare flavor-changing decays of the top quark. As a result,
flavor-changing phenomena are introduced in the BLHM for the first time. In
this study, we incorporate new flavor mixing terms between the light quarks of
the Standard Model (SM) and the fermions and bosons of the BLHM. We compute the
one-loop contributions from the heavy quark $(B)$ and the heavy bosons
$(W^{\prime\pm}, \phi^{\pm}, \eta^{\pm},H^{\pm})$. Our findings demonstrate
that the branching ratios of decays $t\to qV$ and $t\to qh^0$, where $q=u,c$
and $V=Z, \gamma, g $, exhibit improvements compared to their counterparts in
the SM, except for the gluon case. Moreover, we observe that the processes with
higher sensitivity are $Br(t\to cZ)\sim 10^{-5}$, $Br(t\to c\gamma)\sim
10^{-6}$ and $Br(t \to ch^0) \sim 10^{-8}$ within the appropriate parameter
space.
| [
{
"created": "Thu, 23 Mar 2023 17:01:35 GMT",
"version": "v1"
},
{
"created": "Wed, 29 Mar 2023 02:57:00 GMT",
"version": "v2"
},
{
"created": "Thu, 29 Jun 2023 03:50:43 GMT",
"version": "v3"
}
] | 2023-06-30 | [
[
"Cisneros-Pérez",
"T.",
""
],
[
"Hernández-Ruíz",
"M. A.",
""
],
[
"Gutiérrez-Rodríguez",
"A.",
""
],
[
"Cruz-Albaro",
"E.",
""
]
] | This paper investigates the effects of parameters in the Bestest Little Higgs Model (BLHM) on rare flavor-changing decays of the top quark. As a result, flavor-changing phenomena are introduced in the BLHM for the first time. In this study, we incorporate new flavor mixing terms between the light quarks of the Standard Model (SM) and the fermions and bosons of the BLHM. We compute the one-loop contributions from the heavy quark $(B)$ and the heavy bosons $(W^{\prime\pm}, \phi^{\pm}, \eta^{\pm},H^{\pm})$. Our findings demonstrate that the branching ratios of decays $t\to qV$ and $t\to qh^0$, where $q=u,c$ and $V=Z, \gamma, g $, exhibit improvements compared to their counterparts in the SM, except for the gluon case. Moreover, we observe that the processes with higher sensitivity are $Br(t\to cZ)\sim 10^{-5}$, $Br(t\to c\gamma)\sim 10^{-6}$ and $Br(t \to ch^0) \sim 10^{-8}$ within the appropriate parameter space. |
hep-ph/9208218 | Leandros Perivolaropoulos | M. James, L. Perivolaropoulos and T. Vachaspati | On the Stability of Electroweak Strings (New Version) | 1 figure (not include d, available upon request). Use jnl and
reforder macros | null | null | null | hep-ph | null | We map the parameter space that leads to stable Z-vortices in the electroweak
model. For $sin^2 \theta_W = 0.23$, we find that the strings are unstable for a
Higgs mass larger than 24 GeV. Given the latest constraints on the Higgs mass
from LEP, this shows that, if the standard electroweak model is realized in
Nature, the Z-vortex (in the bare model) is unstable.
| [
{
"created": "Tue, 11 Aug 1992 03:27:56 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"James",
"M.",
""
],
[
"Perivolaropoulos",
"L.",
""
],
[
"Vachaspati",
"T.",
""
]
] | We map the parameter space that leads to stable Z-vortices in the electroweak model. For $sin^2 \theta_W = 0.23$, we find that the strings are unstable for a Higgs mass larger than 24 GeV. Given the latest constraints on the Higgs mass from LEP, this shows that, if the standard electroweak model is realized in Nature, the Z-vortex (in the bare model) is unstable. |
1406.4914 | Pilar Coloma | Pilar Coloma, Patrick Huber and Jonathan M. Link | Combining dark matter detectors and electron-capture sources to hunt for
new physics in the neutrino sector | 5 pages, 2 figures. Minor modifications, references added. Version
accepted for publication in JHEP | null | 10.1007/JHEP11(2014)042 | null | hep-ph hep-ex nucl-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this letter we point out the possibility to study new physics in the
neutrino sector using dark matter detectors based on liquid xenon. These are
characterized by very good spatial resolution and extremely low thresholds for
electron recoil energies. When combined with a radioactive $\nu_e$ source, both
features in combination allow for a very competitive sensitivity to neutrino
magnetic moments and sterile neutrino oscillations. We find that, for realistic
values of detector size and source strength, the bound on the neutrino magnetic
moment can be improved by an order of magnitude with respect to the present
value. Regarding sterile neutrino searches, we find that most of the gallium
anomaly could be explored at the 95% confidence level just using shape
information.
| [
{
"created": "Wed, 18 Jun 2014 23:28:43 GMT",
"version": "v1"
},
{
"created": "Tue, 14 Oct 2014 21:20:57 GMT",
"version": "v2"
}
] | 2015-06-22 | [
[
"Coloma",
"Pilar",
""
],
[
"Huber",
"Patrick",
""
],
[
"Link",
"Jonathan M.",
""
]
] | In this letter we point out the possibility to study new physics in the neutrino sector using dark matter detectors based on liquid xenon. These are characterized by very good spatial resolution and extremely low thresholds for electron recoil energies. When combined with a radioactive $\nu_e$ source, both features in combination allow for a very competitive sensitivity to neutrino magnetic moments and sterile neutrino oscillations. We find that, for realistic values of detector size and source strength, the bound on the neutrino magnetic moment can be improved by an order of magnitude with respect to the present value. Regarding sterile neutrino searches, we find that most of the gallium anomaly could be explored at the 95% confidence level just using shape information. |
hep-ph/0008172 | Martti Raidal | M. Raidal (UC Riverside) | Testing Left-Right Symmetric Gauge Theories at e^+e^- Colliders | 11 pages, 4 figures | Phys.Lett. B492 (2000) 107-114 | 10.1016/S0370-2693(00)01078-9 | UCRHEP-T269 | hep-ph | null | If the Standard Model is embedded in a left-right symmetric gauge theory at
the TeV scale, the pair production of light W-bosons in e^+e^- collisions,
e^+e^- -> W^+W^-, will be affected by mixings in the gauge and neutrino
sectors, and by the t-channel exchange of a heavy right-handed neutrino. The
modification of the cross section by these new effects is studied for
high--energy e^+e^- colliders.
| [
{
"created": "Wed, 16 Aug 2000 18:03:35 GMT",
"version": "v1"
}
] | 2009-10-31 | [
[
"Raidal",
"M.",
"",
"UC Riverside"
]
] | If the Standard Model is embedded in a left-right symmetric gauge theory at the TeV scale, the pair production of light W-bosons in e^+e^- collisions, e^+e^- -> W^+W^-, will be affected by mixings in the gauge and neutrino sectors, and by the t-channel exchange of a heavy right-handed neutrino. The modification of the cross section by these new effects is studied for high--energy e^+e^- colliders. |
1608.01307 | Asher Berlin | Asher Berlin | Neutrino Oscillations as a Probe of Light Scalar Dark Matter | 4 pages, 1 figure; added references and updated to published version | Phys. Rev. Lett. 117, 231801 (2016) | 10.1103/PhysRevLett.117.231801 | null | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We consider a class of models involving interactions between ultra-light
scalar dark matter and Standard Model neutrinos. Such couplings modify the
neutrino mass splittings and mixing angles to include additional components
that vary in time periodically with a frequency and amplitude set by the mass
and energy density of the dark matter. Null results from recent searches for
anomalous periodicities in the solar neutrino flux strongly constrain the dark
matter-neutrino coupling to be orders of magnitude below current and projected
limits derived from observations of the cosmic microwave background.
| [
{
"created": "Wed, 3 Aug 2016 20:00:01 GMT",
"version": "v1"
},
{
"created": "Thu, 1 Dec 2016 22:15:10 GMT",
"version": "v2"
}
] | 2016-12-07 | [
[
"Berlin",
"Asher",
""
]
] | We consider a class of models involving interactions between ultra-light scalar dark matter and Standard Model neutrinos. Such couplings modify the neutrino mass splittings and mixing angles to include additional components that vary in time periodically with a frequency and amplitude set by the mass and energy density of the dark matter. Null results from recent searches for anomalous periodicities in the solar neutrino flux strongly constrain the dark matter-neutrino coupling to be orders of magnitude below current and projected limits derived from observations of the cosmic microwave background. |
0906.3026 | Csaba Csaki | Brando Bellazzini, Csaba Csaki, Adam Falkowski and Andreas Weiler | Buried Higgs | 19+1 pages, 13 figures, added references, accepted in PRD | Phys.Rev.D80:075008,2009 | 10.1103/PhysRevD.80.075008 | CERN-PH-TH/2009-096, RUNHETC 2009-07 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present an extension of the MSSM where the dominant decay channel of the
Higgs boson is a cascade decay into a four-gluon final state. In this model the
Higgs is a pseudo-Goldstone boson of a broken global symmetry SU(3)-> SU(2).
Both the global symmetry breaking and electroweak symmetry breaking are
radiatively induced. The global symmetry breaking pattern also implies the
existence of a light (few GeV) pseudo-Goldstone boson eta which is a singlet
under the standard model gauge group. The h -> eta eta branching fraction is
large, and typically dominates over the standard h -> b b decay. The dominant
decay of eta is into two gluons, while the decays to photons, taus or lighter
standard model flavors are suppressed at the level of 10^(-4) or more. With h->
4 jets as the dominant decay, the Higgs could be as light as 78 GeV without
being detected at LEP, while detection at the LHC is extremely challenging.
However many of the super- and global symmetry partners of the standard model
particles should be easily observable at the LHC. Furthermore, the LHC should
be able to observe a "wrong Higgs" that is a 300-400 GeV heavy Higgs-like
particle with suppressed couplings to W and Z that by itself does not account
for electroweak precision observables and the unitarity of WW scattering. At
the same time, the true Higgs is deeply buried in the QCD background.
| [
{
"created": "Wed, 17 Jun 2009 19:05:13 GMT",
"version": "v1"
},
{
"created": "Tue, 22 Sep 2009 02:36:49 GMT",
"version": "v2"
}
] | 2009-11-06 | [
[
"Bellazzini",
"Brando",
""
],
[
"Csaki",
"Csaba",
""
],
[
"Falkowski",
"Adam",
""
],
[
"Weiler",
"Andreas",
""
]
] | We present an extension of the MSSM where the dominant decay channel of the Higgs boson is a cascade decay into a four-gluon final state. In this model the Higgs is a pseudo-Goldstone boson of a broken global symmetry SU(3)-> SU(2). Both the global symmetry breaking and electroweak symmetry breaking are radiatively induced. The global symmetry breaking pattern also implies the existence of a light (few GeV) pseudo-Goldstone boson eta which is a singlet under the standard model gauge group. The h -> eta eta branching fraction is large, and typically dominates over the standard h -> b b decay. The dominant decay of eta is into two gluons, while the decays to photons, taus or lighter standard model flavors are suppressed at the level of 10^(-4) or more. With h-> 4 jets as the dominant decay, the Higgs could be as light as 78 GeV without being detected at LEP, while detection at the LHC is extremely challenging. However many of the super- and global symmetry partners of the standard model particles should be easily observable at the LHC. Furthermore, the LHC should be able to observe a "wrong Higgs" that is a 300-400 GeV heavy Higgs-like particle with suppressed couplings to W and Z that by itself does not account for electroweak precision observables and the unitarity of WW scattering. At the same time, the true Higgs is deeply buried in the QCD background. |
0710.0623 | Gustavo Burdman | Gustavo Burdman and Leandro Da Rold | Electroweak Symmetry Breaking from a Holographic Fourth Generation | 18 pages, 2 figures | JHEP 0712:086,2007 | 10.1088/1126-6708/2007/12/086 | null | hep-ph hep-ex hep-th | null | We consider a model with four generations of standard model fermions
propagating in an extra dimension with an AdS background metric. We show that
if the zero modes of the fourth generation are highly localized towards the
infrared brane, it is possible to break the electroweak symmetry via their
condensation, partly driven by their interactions with the Kaluza-Klein
excitations of the gauge bosons, as well as by the presence of bulk
higher-dimensional operators. This dynamical mechanism results in a composite
Higgs, which is highly localized and generally heavy. The localization of
fermions in the five-dimensional bulk naturally leads to the standard model
Yukawa couplings via the action of the bulk higher-dimensional operators, which
are suppressed by the Planck scale. We obtain the spectrum of the model and
explore some of its phenomenological consequences, both for electroweak
precision constraints as well as at the Large Hadron Collider.
| [
{
"created": "Tue, 2 Oct 2007 20:00:10 GMT",
"version": "v1"
}
] | 2009-01-06 | [
[
"Burdman",
"Gustavo",
""
],
[
"Da Rold",
"Leandro",
""
]
] | We consider a model with four generations of standard model fermions propagating in an extra dimension with an AdS background metric. We show that if the zero modes of the fourth generation are highly localized towards the infrared brane, it is possible to break the electroweak symmetry via their condensation, partly driven by their interactions with the Kaluza-Klein excitations of the gauge bosons, as well as by the presence of bulk higher-dimensional operators. This dynamical mechanism results in a composite Higgs, which is highly localized and generally heavy. The localization of fermions in the five-dimensional bulk naturally leads to the standard model Yukawa couplings via the action of the bulk higher-dimensional operators, which are suppressed by the Planck scale. We obtain the spectrum of the model and explore some of its phenomenological consequences, both for electroweak precision constraints as well as at the Large Hadron Collider. |
0901.1354 | Mingmei Xu | Hongwei Ke, Mingmei Xu, Lianshou Liu | Critical phenomena in disc-percolation model and its application to
relativistic heavy ion collisions | 5 pages, 7 figures | null | 10.1088/1674-1137/33/10/007 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Through studying the critical phenomena in continuum-percolation of discs, we
find a new approach to locate the critical point, i.e. using the inflection
point of $P_\infty$ as an evaluation of the percolation threshold. The
susceptibility, defined as the derivative of $P_\infty$, possess finite-size
scaling property, where the scaling exponent is the reciprocal of $\nu$ -- the
critical exponent of correlation length. The possible application of this
approach to the study of the critical phenomena in relativistic heavy ion
collisions is discussed. The critical point for deconfinement can be extracted
by the inflection point of $P_{\rm QGP}$ -- the probability for the event with
QGP formation. The finite-size scaling of its derivative can give the critical
exponent $\nu$, which is a rare case that can provide an experimental measure
of a critical exponent in heavy ion collisions.
| [
{
"created": "Sat, 10 Jan 2009 06:37:22 GMT",
"version": "v1"
}
] | 2015-05-13 | [
[
"Ke",
"Hongwei",
""
],
[
"Xu",
"Mingmei",
""
],
[
"Liu",
"Lianshou",
""
]
] | Through studying the critical phenomena in continuum-percolation of discs, we find a new approach to locate the critical point, i.e. using the inflection point of $P_\infty$ as an evaluation of the percolation threshold. The susceptibility, defined as the derivative of $P_\infty$, possess finite-size scaling property, where the scaling exponent is the reciprocal of $\nu$ -- the critical exponent of correlation length. The possible application of this approach to the study of the critical phenomena in relativistic heavy ion collisions is discussed. The critical point for deconfinement can be extracted by the inflection point of $P_{\rm QGP}$ -- the probability for the event with QGP formation. The finite-size scaling of its derivative can give the critical exponent $\nu$, which is a rare case that can provide an experimental measure of a critical exponent in heavy ion collisions. |
1812.06786 | Vivek Tiwari Kumar | Suraj Kumar Rai and Vivek Kumar Tiwari | Exploring axial $U(1)$ restoration in a modified 2+1 flavor Polyakov
quark meson model | 20 pages, 14 figures. arXiv admin note: text overlap with
arXiv:1301.3717 | Eur.Phys.J.Plus 135 (2020) 10, 844 | 10.1140/epjp/s13360-020-00851-5 | null | hep-ph nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We report on the $U_{A}(1)$ symmetry restoration resulting due to temperature
dependence of the coefficient c(T) for the Kobayashi-Maskawa-'t Hooft
determinant (KMT) term in a modified 2+1 flavor Polyakov loop quark meson model
having fermionic vacuum correction term (PQMVT).Temperature dependence of KMT
coupling c(T) drives the non-strange condensate melting to significantly
smaller temperatures in comparison to the constant c case.Further due to c(T),
$m_{\eta^{\prime}}$ decreases from its vacuum value by 220 MeV near T=176 MeV
after the chiral transition ($T_{c}^{\chi}=154.9$ MeV).This is similar to the
$\eta^{\prime}$ in-medium mass drop of at least 200 MeV as reported by Csorgo
and Vertesi in Ref (Phys Rev Lett 105:182301,2010; Phys Rev C 83:054903,2011),
as an experimental signature of the effective restoration of $U_A(1)$ symmetry.
The pseudoscalar mixing angle $\theta_p$ achieves anti-ideal mixing in the
influence of c(T). The $\eta $ meson becomes light quark system ($ \eta_{NS} $)
at T=176 MeV and changes its identity with $ \eta' $ meson which becomes
strange quark system ($ \eta_{S} $). The degenerated temperature variations of
$\sigma$, $\pi$ meson masses merges with the temperature variations of the
masses of degenerated $a_{0}$, $\eta$ mesons near 275 MeV. It means that for
c(T) when $m_{\sigma}=400$ MeV, the $U_{A}(1)$ restoration takes place at 1.75
$T_{c}^{\chi}$=275 MeV.
| [
{
"created": "Fri, 14 Dec 2018 09:28:42 GMT",
"version": "v1"
},
{
"created": "Sat, 24 Oct 2020 10:40:57 GMT",
"version": "v2"
}
] | 2020-10-29 | [
[
"Rai",
"Suraj Kumar",
""
],
[
"Tiwari",
"Vivek Kumar",
""
]
] | We report on the $U_{A}(1)$ symmetry restoration resulting due to temperature dependence of the coefficient c(T) for the Kobayashi-Maskawa-'t Hooft determinant (KMT) term in a modified 2+1 flavor Polyakov loop quark meson model having fermionic vacuum correction term (PQMVT).Temperature dependence of KMT coupling c(T) drives the non-strange condensate melting to significantly smaller temperatures in comparison to the constant c case.Further due to c(T), $m_{\eta^{\prime}}$ decreases from its vacuum value by 220 MeV near T=176 MeV after the chiral transition ($T_{c}^{\chi}=154.9$ MeV).This is similar to the $\eta^{\prime}$ in-medium mass drop of at least 200 MeV as reported by Csorgo and Vertesi in Ref (Phys Rev Lett 105:182301,2010; Phys Rev C 83:054903,2011), as an experimental signature of the effective restoration of $U_A(1)$ symmetry. The pseudoscalar mixing angle $\theta_p$ achieves anti-ideal mixing in the influence of c(T). The $\eta $ meson becomes light quark system ($ \eta_{NS} $) at T=176 MeV and changes its identity with $ \eta' $ meson which becomes strange quark system ($ \eta_{S} $). The degenerated temperature variations of $\sigma$, $\pi$ meson masses merges with the temperature variations of the masses of degenerated $a_{0}$, $\eta$ mesons near 275 MeV. It means that for c(T) when $m_{\sigma}=400$ MeV, the $U_{A}(1)$ restoration takes place at 1.75 $T_{c}^{\chi}$=275 MeV. |
hep-ph/0602054 | Roman Nevzorov | Colin D.Froggatt, Larisa Laperashvili, Roman Nevzorov, Holger Bech
Nielsen, Marc Sher | Implementation of the Multiple Point Principle in the Two-Higgs Doublet
Model of type II | 26 pages, 3 figures, some minor changes to the text | Phys.Rev. D73 (2006) 095005 | 10.1103/PhysRevD.73.095005 | null | hep-ph | null | The multiple point principle (MPP) is applied to the non--supersymmetric
two-Higgs doublet extension of the Standard Model (SM). The existence of a
large set of degenerate vacua at some high energy scale caused by the MPP
results in a few relations between Higgs self-coupling constants which can be
examined at future colliders. The numerical analysis reveals that these MPP
conditions constrain the mass of the SM--like Higgs boson to lie below 180 GeV
for a wide set of MPP scales $\Lambda$ and $\tan\beta$.
| [
{
"created": "Mon, 6 Feb 2006 21:08:09 GMT",
"version": "v1"
},
{
"created": "Wed, 1 Mar 2006 18:25:19 GMT",
"version": "v2"
}
] | 2009-11-11 | [
[
"Froggatt",
"Colin D.",
""
],
[
"Laperashvili",
"Larisa",
""
],
[
"Nevzorov",
"Roman",
""
],
[
"Nielsen",
"Holger Bech",
""
],
[
"Sher",
"Marc",
""
]
] | The multiple point principle (MPP) is applied to the non--supersymmetric two-Higgs doublet extension of the Standard Model (SM). The existence of a large set of degenerate vacua at some high energy scale caused by the MPP results in a few relations between Higgs self-coupling constants which can be examined at future colliders. The numerical analysis reveals that these MPP conditions constrain the mass of the SM--like Higgs boson to lie below 180 GeV for a wide set of MPP scales $\Lambda$ and $\tan\beta$. |
2202.07116 | J. P. Ma | J.P. Ma, Z.Y. Pang and G.P. Zhang | QCD Factorization of Quasi Generalized Quark Distributions | References, discussions and evolution equations of quark GPDs derived
from results of the paper are added. To appear in JHEP | null | 10.1007/JHEP08(2022)130 | null | hep-ph hep-lat | http://creativecommons.org/licenses/by/4.0/ | We study the factorization of quasi generalized quark distributions with
twist-2 generalized parton distributions. We use an approach which is different
than that used in literature. Using the approach we derive the factorization
relations of all quasi generalized quark distributions at one-loop. The
contributions from twist-2 generalized gluon distributions are included. Our
results apply not only to the quasi distributions of a spin-1/2 hadron but also
to those of a hadron with any spin.
| [
{
"created": "Tue, 15 Feb 2022 01:06:27 GMT",
"version": "v1"
},
{
"created": "Sun, 31 Jul 2022 01:50:08 GMT",
"version": "v2"
}
] | 2022-09-07 | [
[
"Ma",
"J. P.",
""
],
[
"Pang",
"Z. Y.",
""
],
[
"Zhang",
"G. P.",
""
]
] | We study the factorization of quasi generalized quark distributions with twist-2 generalized parton distributions. We use an approach which is different than that used in literature. Using the approach we derive the factorization relations of all quasi generalized quark distributions at one-loop. The contributions from twist-2 generalized gluon distributions are included. Our results apply not only to the quasi distributions of a spin-1/2 hadron but also to those of a hadron with any spin. |
hep-ph/0502082 | Pasquale Di Bari | Pasquale Di Bari | Seesaw geometry and leptogenesis | 48 pages, 11 figures; v2: typos corrected; added 1 figure,
references, footnotes, more details at the end of 5.1 and in Section 7; to
appear on NPB | Nucl.Phys.B727:318-354,2005 | 10.1016/j.nuclphysb.2005.08.032 | MPP-2005-5 | hep-ph | null | The representation of the seesaw orthogonal matrix in the complex plane
establishes a graphical correspondence between neutrino mass models and
geometrical configurations, particularly useful to study relevant aspects of
leptogenesis. We first derive the CP asymmetry bound for hierarchical heavy
neutrinos and then an expression for the effective leptogenesis phase,
determining the conditions for maximal phase and placing a lower bound on the
phase suppression for generic models. Reconsidering the lower bounds on the
lightest right-handed (RH) neutrino mass M_1 and on the reheating temperature
T_reh, we find that models where one of the two heavier neutrino masses is
dominated by the lightest right-handed (RH) neutrinos, typically arising from
connections with quark masses, undergo both phase suppression and strong
wash-out such that M_1 (T_reh)\gtrsim 10^{11} (10^{10}) GeV. The window 10^9
GeV \lesssim M_1,T_reh \lesssim 10^{10}GeV is accessible only for a class of
models where m_1 is dominated by the lightest RH neutrino, with no
straightforward connections with quark masses. Within this class we describe a
new scenario of thermal leptogenesis where the baryon asymmetry of the Universe
is generated by the decays of the second lightest RH neutrino, such that the
lower bound on M_1 disappears and is replaced by a lower bound on M_2.
Interestingly, the final asymmetry is independent on the initial conditions. We
also discuss the validity of the approximation of hierarchical heavy neutrinos
in a simple analytical way.
| [
{
"created": "Wed, 9 Feb 2005 01:14:42 GMT",
"version": "v1"
},
{
"created": "Mon, 22 Aug 2005 15:07:48 GMT",
"version": "v2"
}
] | 2011-07-19 | [
[
"Di Bari",
"Pasquale",
""
]
] | The representation of the seesaw orthogonal matrix in the complex plane establishes a graphical correspondence between neutrino mass models and geometrical configurations, particularly useful to study relevant aspects of leptogenesis. We first derive the CP asymmetry bound for hierarchical heavy neutrinos and then an expression for the effective leptogenesis phase, determining the conditions for maximal phase and placing a lower bound on the phase suppression for generic models. Reconsidering the lower bounds on the lightest right-handed (RH) neutrino mass M_1 and on the reheating temperature T_reh, we find that models where one of the two heavier neutrino masses is dominated by the lightest right-handed (RH) neutrinos, typically arising from connections with quark masses, undergo both phase suppression and strong wash-out such that M_1 (T_reh)\gtrsim 10^{11} (10^{10}) GeV. The window 10^9 GeV \lesssim M_1,T_reh \lesssim 10^{10}GeV is accessible only for a class of models where m_1 is dominated by the lightest RH neutrino, with no straightforward connections with quark masses. Within this class we describe a new scenario of thermal leptogenesis where the baryon asymmetry of the Universe is generated by the decays of the second lightest RH neutrino, such that the lower bound on M_1 disappears and is replaced by a lower bound on M_2. Interestingly, the final asymmetry is independent on the initial conditions. We also discuss the validity of the approximation of hierarchical heavy neutrinos in a simple analytical way. |
hep-ph/0007321 | Ernest Ma | Ernest Ma (UC Riverside), Martti Raidal (UC Riverside), and Utpal
Sarkar (PRL, Ahmedabad) | Low-Scale Axion from Large Extra Dimensions | 11 pages, no figure | Phys.Lett. B504 (2001) 296-300 | 10.1016/S0370-2693(01)00315-X | UCRHEP-T283 (July 2000) | hep-ph | null | The mass of the axion and its decay rate are known to depend only on the
scale of Peccei-Quinn symmetry breaking, which is constrained by astrophysics
and cosmology to be between $10^9$ and $10^{12}$ GeV. We propose a new
mechanism such that this effective scale is preserved and yet the fundamental
breaking scale of $U(1)_{PQ}$ is very small (a kind of inverse seesaw) in the
context of large extra dimensions with an anomalous U(1) gauge symmetry in our
brane. Unlike any other (invisible) axion model, there are now possible
collider signatures in this scenario.
| [
{
"created": "Thu, 27 Jul 2000 19:37:19 GMT",
"version": "v1"
}
] | 2009-10-31 | [
[
"Ma",
"Ernest",
"",
"UC Riverside"
],
[
"Raidal",
"Martti",
"",
"UC Riverside"
],
[
"Sarkar",
"Utpal",
"",
"PRL, Ahmedabad"
]
] | The mass of the axion and its decay rate are known to depend only on the scale of Peccei-Quinn symmetry breaking, which is constrained by astrophysics and cosmology to be between $10^9$ and $10^{12}$ GeV. We propose a new mechanism such that this effective scale is preserved and yet the fundamental breaking scale of $U(1)_{PQ}$ is very small (a kind of inverse seesaw) in the context of large extra dimensions with an anomalous U(1) gauge symmetry in our brane. Unlike any other (invisible) axion model, there are now possible collider signatures in this scenario. |
hep-ph/9912205 | Evgeny Akhmedov | E.Kh. Akhmedov, G.C. Branco and M.N. Rebelo | Linking solar and long baseline terrestrial neutrino experiments | revtex, 4 pages, no figures. Discussion of the LOW solution modified;
results unchanged. References added | Phys.Rev.Lett.84:3535,2000 | 10.1103/PhysRevLett.84.3535 | FISIST/21-99/CFIF | hep-ph astro-ph hep-ex | null | We show that in the framework of three light neutrino species with
hierarchical masses and assuming no fine tuning between the entries of the
neutrino mass matrix, one can use the solar neutrino data to obtain information
on the element $U_{e3}$ of the lepton mixing matrix. Conversely, a measurement
of $U_{e3}$ in atmospheric or long baseline accelerator or reactor neutrino
experiments would help discriminate between possible oscillation solutions of
the solar neutrino problem.
| [
{
"created": "Wed, 1 Dec 1999 15:56:36 GMT",
"version": "v1"
},
{
"created": "Sat, 4 Dec 1999 11:02:52 GMT",
"version": "v2"
}
] | 2008-11-26 | [
[
"Akhmedov",
"E. Kh.",
""
],
[
"Branco",
"G. C.",
""
],
[
"Rebelo",
"M. N.",
""
]
] | We show that in the framework of three light neutrino species with hierarchical masses and assuming no fine tuning between the entries of the neutrino mass matrix, one can use the solar neutrino data to obtain information on the element $U_{e3}$ of the lepton mixing matrix. Conversely, a measurement of $U_{e3}$ in atmospheric or long baseline accelerator or reactor neutrino experiments would help discriminate between possible oscillation solutions of the solar neutrino problem. |
hep-ph/0606083 | Julie Malcles | Julie Malcl\`es | Depuzzling B -> Kpi: constraints on the Unitarity Triangle from B, Bs ->
pipi, Kpi, KK decays in the SU(3) limit | Talk given at "Rencontres de Moriond 2006, Electroweak" by Julie
Malcl\`es based on work in collaboration with J\'er\^ome Charles and Jos\'e
Ocariz | null | null | null | hep-ph | null | Constraining CKM parameters from charmless hadronic B decays requires methods
for addressing the hadronic uncertainties. A complete technique is presented,
using relations between amplitudes in the B, Bs -> pipi, Kpi, KK system
obtained in the exact SU(3) symmetry limit, without having to neglect
annihilation/exchange topologies. Naive SU(3)-breaking effects in the decay
amplitudes are taken into account, through the inclusion of pi and K decay
constants in the normalisations and conservative theoretical errors. Already
with the limited set of observables currently available, significant
constraints on the CKM parameters are obtained. Also, subsets of observables
are shown to bring non trivial constraints on the CKM angles alpha and beta, in
agreement with analytical solutions that we derive. Finally, the future physics
potential of this method is estimated, in light of the increased precision of
measurements from the current B-factories, and the inclusion of several new
observables from Bs decays expected to be provided by the LHC experiments.
| [
{
"created": "Wed, 7 Jun 2006 15:06:08 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Malclès",
"Julie",
""
]
] | Constraining CKM parameters from charmless hadronic B decays requires methods for addressing the hadronic uncertainties. A complete technique is presented, using relations between amplitudes in the B, Bs -> pipi, Kpi, KK system obtained in the exact SU(3) symmetry limit, without having to neglect annihilation/exchange topologies. Naive SU(3)-breaking effects in the decay amplitudes are taken into account, through the inclusion of pi and K decay constants in the normalisations and conservative theoretical errors. Already with the limited set of observables currently available, significant constraints on the CKM parameters are obtained. Also, subsets of observables are shown to bring non trivial constraints on the CKM angles alpha and beta, in agreement with analytical solutions that we derive. Finally, the future physics potential of this method is estimated, in light of the increased precision of measurements from the current B-factories, and the inclusion of several new observables from Bs decays expected to be provided by the LHC experiments. |
hep-ph/9812516 | Jiri Hosek | Jiri Hosek | Macroscopic quantum phases of a deconfined QCD matter at finite density | 6 pages, no figures | null | null | null | hep-ph | null | Formalism for a unified description of distinct superfluid phases of a
deconfined QCD matter at finite density together with the phase of
spontaneously broken chiral symmetry is presented. Dispersion laws of the
quasiquark excitations in both diamagnetic and ferromagnetic phases with
spontaneously broken chiral symmetry are exhibited explicitly.
| [
{
"created": "Tue, 29 Dec 1998 13:19:09 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Hosek",
"Jiri",
""
]
] | Formalism for a unified description of distinct superfluid phases of a deconfined QCD matter at finite density together with the phase of spontaneously broken chiral symmetry is presented. Dispersion laws of the quasiquark excitations in both diamagnetic and ferromagnetic phases with spontaneously broken chiral symmetry are exhibited explicitly. |
1702.04596 | Nikolai Krasnikov | N.V.Krasnikov | The muon (g - 2) anomaly and a new light vector boson | Based on talk given at the meeting celebrated Prof. V.A.Matveev
jubilee, Dubna, 16 December 2016 | null | null | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | This mini review aims to outline the main experimental and theoretical
results related with the search for a new light vector boson proposed as a
solution of the muon $g-2$ anomaly. Additionally, I consider a model with
infinite number of light vector bosons which can explain the anomaly, while
still remaining consistent with current experimental bounds.
| [
{
"created": "Wed, 15 Feb 2017 13:27:18 GMT",
"version": "v1"
}
] | 2017-02-16 | [
[
"Krasnikov",
"N. V.",
""
]
] | This mini review aims to outline the main experimental and theoretical results related with the search for a new light vector boson proposed as a solution of the muon $g-2$ anomaly. Additionally, I consider a model with infinite number of light vector bosons which can explain the anomaly, while still remaining consistent with current experimental bounds. |
hep-ph/0208246 | Sahal Yacoob | Sahal Yacoob, Jean Cleymans | Thermal Model Description of Strangeness Enhancement at Mid-Rapidity in
Pb--Pb collisions at 158 GeV A/c | 6 pages, 4 figures | null | null | null | hep-ph | null | The results of the WA97 collaboration for strange particle production at
mid-rapidity in Pb--Pb collisions at 158 GeV A/c at CERN display a strong
strangeness enhancement with system size at mid-rapidity which is dependent on
the strangeness of the particle concerned, and saturates at values of
participating nucleons greater than 120. These results are phenomenologically
described by the mixed canonical ensemble, with canonical (exact) strangeness
conservation involving all strange resonances, and grand canonical conservation
of charge and baryon number. A detailed quantitative analysis shows that the
data are well described by an equilibrium (gamma_S equivalent to 1) hadron gas.
| [
{
"created": "Tue, 27 Aug 2002 11:44:43 GMT",
"version": "v1"
},
{
"created": "Thu, 3 Oct 2002 18:06:20 GMT",
"version": "v2"
}
] | 2007-05-23 | [
[
"Yacoob",
"Sahal",
""
],
[
"Cleymans",
"Jean",
""
]
] | The results of the WA97 collaboration for strange particle production at mid-rapidity in Pb--Pb collisions at 158 GeV A/c at CERN display a strong strangeness enhancement with system size at mid-rapidity which is dependent on the strangeness of the particle concerned, and saturates at values of participating nucleons greater than 120. These results are phenomenologically described by the mixed canonical ensemble, with canonical (exact) strangeness conservation involving all strange resonances, and grand canonical conservation of charge and baryon number. A detailed quantitative analysis shows that the data are well described by an equilibrium (gamma_S equivalent to 1) hadron gas. |
hep-ph/9409241 | Neville Jones | N. Jones and R. Delbourgo | Meson Supermultiplet Decay Constants | 18 pages, UTAS-PHYS-94-26, Latex | Austral.J.Phys.48:55-69,1995 | 10.1071/PH950055 | null | hep-ph | null | We use a covariant supermultiplet theory to determine the primary coupling
constant associated with several types of two-body meson decay. Despite the
diverse range of decays considered the primary coupling constant is
surprisingly uniform. We envisage the extension of the techniques to heavy
quark cases, including as preliminary examples the calculation of the $D^{*+}$
and $D^{*0}$ total decay widths with results $57.7 \pm 1.5$ KeV and $42.5 \pm
2.6$ KeV respectively, as well as some predictions about $D^*$ and $B^*$
radiative decays. (3 uuencoded Postscript Files are appended at the end of the
TexFile.)
| [
{
"created": "Wed, 7 Sep 1994 20:46:08 GMT",
"version": "v1"
}
] | 2015-06-25 | [
[
"Jones",
"N.",
""
],
[
"Delbourgo",
"R.",
""
]
] | We use a covariant supermultiplet theory to determine the primary coupling constant associated with several types of two-body meson decay. Despite the diverse range of decays considered the primary coupling constant is surprisingly uniform. We envisage the extension of the techniques to heavy quark cases, including as preliminary examples the calculation of the $D^{*+}$ and $D^{*0}$ total decay widths with results $57.7 \pm 1.5$ KeV and $42.5 \pm 2.6$ KeV respectively, as well as some predictions about $D^*$ and $B^*$ radiative decays. (3 uuencoded Postscript Files are appended at the end of the TexFile.) |
1102.3898 | Ayse Cagil | Ayse Cagil | Double charged scalars of littlest higgs model in ee colliders | Talk given in "Third International Workshop on Prospects for Charged
Higgs Discovery at Colliders - CHARGED2010, September 27-30, 2010, Uppsala
Sweden" | null | null | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Little Higgs models contain heavy scalars in their content of particles as a
result of extended symmetry group of SM. In the littlest Higgs model of little
Higgs models there exists a new heavy scalar triplet.The physical states of
this triplet contains a double charged scalar, a single charged scalar, as well
as a neutral scalar and a neutral pseudo scalar. In little Higgs models a
Majorana type mass term can also be implemented in Yukawa Lagrangian, resulting
lepton flavor violation.
In this talk the pair productions of double charged scalars in the context of
littlest Higgs model in $e^+e^-$ colliders are presented. Also the final
signatures of double charged scalars will be analyzed depending on lepton
flavor violation parameters. Finally it will be presented that if there is
lepton flavor violation, double charged scalars can be observed without any SM
background in $e^+e^-$ colliders with a collider signal of four leptons,
otherwise if there is no lepton flavor violation they can be reconstructed with
a background analysis.
| [
{
"created": "Fri, 18 Feb 2011 20:04:39 GMT",
"version": "v1"
}
] | 2011-02-21 | [
[
"Cagil",
"Ayse",
""
]
] | Little Higgs models contain heavy scalars in their content of particles as a result of extended symmetry group of SM. In the littlest Higgs model of little Higgs models there exists a new heavy scalar triplet.The physical states of this triplet contains a double charged scalar, a single charged scalar, as well as a neutral scalar and a neutral pseudo scalar. In little Higgs models a Majorana type mass term can also be implemented in Yukawa Lagrangian, resulting lepton flavor violation. In this talk the pair productions of double charged scalars in the context of littlest Higgs model in $e^+e^-$ colliders are presented. Also the final signatures of double charged scalars will be analyzed depending on lepton flavor violation parameters. Finally it will be presented that if there is lepton flavor violation, double charged scalars can be observed without any SM background in $e^+e^-$ colliders with a collider signal of four leptons, otherwise if there is no lepton flavor violation they can be reconstructed with a background analysis. |
hep-ph/9612421 | null | Isard Dunietz, Joseph Incandela (Fermilab), Frederick Snider (The
Johns Hopkins University), Hitoshi Yamamoto (Harvard University) | Large Charmless Yield in B Decays and Inclusive B Decay Puzzles | 26 pages, 5 figures, Latex. Expanded and two new figures added | Eur.Phys.J.C1:211-219,1998 | 10.1007/BF01245810 | FERMILAB-PUB-96/421-T, HUTP-96/A055 | hep-ph | null | In recent studies of inclusive $B$ decays, it has been suggested that either
$B$ mesons decay much more copiously to final states with no open charm than
currently assumed, or $B(D^0 \to K^-\pi^+)$ has to be reduced significantly.
This note takes the experimental $B(D^0 \to K^-\pi^+)$ at its face value and
estimates $B(b\to$ no open charm) using complementary methods: one accounts for
the $c$ quark in $b\to c$ transitions, the other accounts for the $\bar c$
quark in $b\to c\bar c s$ transitions. Through cancellation of errors, the
average gives our best estimate of $B(b\to$ no open charm), and the difference
measures the consistency. The results of the methods are consistent with each
other, strongly suggesting a much enhanced $B(b\to$ no open charm). This
observation indicates that non-perturbative QCD effects are probably causing a
sizable fraction of the $b\to c\bar cs$ transitions to be seen as charmless
$b\to s$ processes, contrary to smaller traditional expectations. This
mechanism has generally been overlooked and may explain the existing
experimental data within the framework of the standard model. We then briefly
discuss implications on baryon production governed by $b\to c\bar cs$
processes, rare hadronic $B$ decays and CP violation studies.
| [
{
"created": "Thu, 19 Dec 1996 20:36:15 GMT",
"version": "v1"
},
{
"created": "Tue, 8 Jul 1997 07:16:02 GMT",
"version": "v2"
}
] | 2015-06-25 | [
[
"Dunietz",
"Isard",
"",
"Fermilab"
],
[
"Incandela",
"Joseph",
"",
"Fermilab"
],
[
"Snider",
"Frederick",
"",
"The\n Johns Hopkins University"
],
[
"Yamamoto",
"Hitoshi",
"",
"Harvard University"
]
] | In recent studies of inclusive $B$ decays, it has been suggested that either $B$ mesons decay much more copiously to final states with no open charm than currently assumed, or $B(D^0 \to K^-\pi^+)$ has to be reduced significantly. This note takes the experimental $B(D^0 \to K^-\pi^+)$ at its face value and estimates $B(b\to$ no open charm) using complementary methods: one accounts for the $c$ quark in $b\to c$ transitions, the other accounts for the $\bar c$ quark in $b\to c\bar c s$ transitions. Through cancellation of errors, the average gives our best estimate of $B(b\to$ no open charm), and the difference measures the consistency. The results of the methods are consistent with each other, strongly suggesting a much enhanced $B(b\to$ no open charm). This observation indicates that non-perturbative QCD effects are probably causing a sizable fraction of the $b\to c\bar cs$ transitions to be seen as charmless $b\to s$ processes, contrary to smaller traditional expectations. This mechanism has generally been overlooked and may explain the existing experimental data within the framework of the standard model. We then briefly discuss implications on baryon production governed by $b\to c\bar cs$ processes, rare hadronic $B$ decays and CP violation studies. |
1609.07344 | Zurab Tavartkiladze | Luka Megrelidze, Zurab Tavartkiladze | Soft See-Saw: Radiative Origin of Neutrino Masses in SUSY Theories | Added Discussions, clarifying remarks and references; Matched to
Nucl. Phys. B version. LaTex, 6 figures, 3 tables | null | 10.1016/j.nuclphysb.2016.11.019 | null | hep-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Radiative neutrino mass generation within supersymmetric (SUSY) construction
is studied. The mechanism is considered where the lepton number violation is
originating from the soft SUSY breaking terms. This requires MSSM extensions
with states around the TeV scale. We present several explicit realizations
based on extensions either by MSSM singlet or SU(2)_w triplet states. Besides
some novelties of the proposed scenarios, various phenomenological implications
are also discussed.
| [
{
"created": "Fri, 23 Sep 2016 12:58:32 GMT",
"version": "v1"
},
{
"created": "Thu, 29 Sep 2016 17:12:47 GMT",
"version": "v2"
},
{
"created": "Tue, 6 Dec 2016 11:05:37 GMT",
"version": "v3"
}
] | 2017-01-04 | [
[
"Megrelidze",
"Luka",
""
],
[
"Tavartkiladze",
"Zurab",
""
]
] | Radiative neutrino mass generation within supersymmetric (SUSY) construction is studied. The mechanism is considered where the lepton number violation is originating from the soft SUSY breaking terms. This requires MSSM extensions with states around the TeV scale. We present several explicit realizations based on extensions either by MSSM singlet or SU(2)_w triplet states. Besides some novelties of the proposed scenarios, various phenomenological implications are also discussed. |
hep-ph/9810225 | null | Ya. A. Berdnikov, A. N. Ivanov, V. F. Kosmach and N.I.Troitskaya
(Vienna Techn.Univ.) | On the $\Lambda^+_c$ -> p + K^- + $\pi^+$ decay | 18 pages, Latex, no figures | Phys.Rev. C60 (1999) 015201 | 10.1103/PhysRevC.60.015201 | null | hep-ph | null | The proton energy spectrum and the angular distribution of the probability of
the $\Lambda^+_c$ -> p + $K^-$ + $\pi^+$ decay for the polarized $\Lambda^+_c$
and the unpolarized proton are calculated in the effective quark model with
chiral U(3) X U(3) symmetry incorporating Heavy Quark Effective theory (HQET)
and Chiral perturbation theory at the quark level (CHPT)$_q$. The application
of the obtained result to the analysis of the polarization of the $\Lambda^+_c$
produced in the processes of photo and hadroproduction is discussed. We draw
the similarity between the measurements of the polarization of the
$\Lambda^+_c$ in the $\Lambda^+_c$ -> p + $K^-$ + $\pi^+$ decay and the
$\mu^-$--meson in the $\mu^-$ -> $e^-$ + $\bar{\nu}_e$ + $\nu_{\mu}$ decay.
| [
{
"created": "Fri, 2 Oct 1998 14:21:19 GMT",
"version": "v1"
}
] | 2009-10-31 | [
[
"Berdnikov",
"Ya. A.",
"",
"Vienna Techn.Univ."
],
[
"Ivanov",
"A. N.",
"",
"Vienna Techn.Univ."
],
[
"Kosmach",
"V. F.",
"",
"Vienna Techn.Univ."
],
[
"Troitskaya",
"N. I.",
"",
"Vienna Techn.Univ."
]
] | The proton energy spectrum and the angular distribution of the probability of the $\Lambda^+_c$ -> p + $K^-$ + $\pi^+$ decay for the polarized $\Lambda^+_c$ and the unpolarized proton are calculated in the effective quark model with chiral U(3) X U(3) symmetry incorporating Heavy Quark Effective theory (HQET) and Chiral perturbation theory at the quark level (CHPT)$_q$. The application of the obtained result to the analysis of the polarization of the $\Lambda^+_c$ produced in the processes of photo and hadroproduction is discussed. We draw the similarity between the measurements of the polarization of the $\Lambda^+_c$ in the $\Lambda^+_c$ -> p + $K^-$ + $\pi^+$ decay and the $\mu^-$--meson in the $\mu^-$ -> $e^-$ + $\bar{\nu}_e$ + $\nu_{\mu}$ decay. |
hep-ph/9907300 | Enrico Piotto | P. Checchia (I.N.F.N., Padova, Italy), E. Piotto (University of
Milano, Milano, Italy) F. Simonetto (University of Padova, Padova, Italy) | The hypothesis of a real Cabibbo Kobayashi Maskawa matrix | null | null | null | DFPD-99-EP-27 | hep-ph | null | The hypothesis of a real Cabibbo-Kobayashi-Maskawa matrix has been considered
and found to be disfavoured by present measurements even when neglecting
results from CP violation in neutral Kaon decay. The Best Linear Unbiased
Estimator has been used as a statistical approach to compute the Confidence
Level. A new way to take into account the information from Bs mesons
oscillations has been considered, reducing considerably the error on
extractions of rho and eta parameter of the Wolfenstain parametrization of the
matrix.
| [
{
"created": "Mon, 12 Jul 1999 10:14:51 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Checchia",
"P.",
"",
"I.N.F.N., Padova, Italy"
],
[
"Piotto",
"E.",
"",
"University of\n Milano, Milano, Italy"
],
[
"Simonetto",
"F.",
"",
"University of Padova, Padova, Italy"
]
] | The hypothesis of a real Cabibbo-Kobayashi-Maskawa matrix has been considered and found to be disfavoured by present measurements even when neglecting results from CP violation in neutral Kaon decay. The Best Linear Unbiased Estimator has been used as a statistical approach to compute the Confidence Level. A new way to take into account the information from Bs mesons oscillations has been considered, reducing considerably the error on extractions of rho and eta parameter of the Wolfenstain parametrization of the matrix. |
hep-ph/0507268 | Jianwei Qiu | Jian-Wei Qiu | Rescattering effects in hadron-nucleus and heavy-ion collisions | 8 pages, 13 figures, to be published in the Proceedings of 1st
International Conference on Hard and Electromagnetic Probes of High Energy
Nuclear Collisions (Hard Probe 2004), Ericeira, Portugal, Nov. 4-10, 2004 | Eur.Phys.J.C43:239-247,2005 | 10.1140/epjc/s2005-02328-4 | null | hep-ph | null | We review the extension of the factorization formalism of perturbative QCD to
{\it coherent} soft rescattering associated with hard scattering in high energy
nuclear collisions. We emphasize the ability to quantify high order corrections
and the predictive power of factorization approach in terms of universal
nonperturbative matrix elements. Although coherent rescattering effects are
power suppressed by hard scales of the scattering, they are enhanced by the
nuclear size and could play an important role in understanding the novel
nuclear dependence observed in high energy nuclear collisions.
| [
{
"created": "Fri, 22 Jul 2005 21:03:56 GMT",
"version": "v1"
}
] | 2009-01-07 | [
[
"Qiu",
"Jian-Wei",
""
]
] | We review the extension of the factorization formalism of perturbative QCD to {\it coherent} soft rescattering associated with hard scattering in high energy nuclear collisions. We emphasize the ability to quantify high order corrections and the predictive power of factorization approach in terms of universal nonperturbative matrix elements. Although coherent rescattering effects are power suppressed by hard scales of the scattering, they are enhanced by the nuclear size and could play an important role in understanding the novel nuclear dependence observed in high energy nuclear collisions. |
1309.1688 | Stephen Godfrey | Stephen Godfrey (Carleton University) and Travis Martin (TRIUMF) | Z' Discovery Reach at Future Hadron Colliders: A Snowmass White Paper | 3 pages, 1 figure, contribution to the 2013 Snowmass Community Summer
Study | null | null | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Extra neutral gauge bosons are a feature of many models of physics beyond the
standard model (BSM) and their discovery could possibly be the first evidence
for new physics. In this Snowmass white paper we compare the discovery reach of
the high energy hadron colliders considered by the Snowmass study for a broad
range of BSM models. It is expected that the LHC should be able to see evidence
for a Z' arising from a large variety of BSM models up to a mass of ~5 TeV when
the LHC reaches its design energy and luminosity, and up to ~6 TeV with the
high luminosity upgrade. Further into the future, the high energy LHC would
substantially extend this reach to ~11 TeV, while the ~100 TeV VHE-LHC could
see evidence for Z' 's up to ~30 TeV.
| [
{
"created": "Fri, 6 Sep 2013 16:10:23 GMT",
"version": "v1"
}
] | 2013-09-09 | [
[
"Godfrey",
"Stephen",
"",
"Carleton University"
],
[
"Martin",
"Travis",
"",
"TRIUMF"
]
] | Extra neutral gauge bosons are a feature of many models of physics beyond the standard model (BSM) and their discovery could possibly be the first evidence for new physics. In this Snowmass white paper we compare the discovery reach of the high energy hadron colliders considered by the Snowmass study for a broad range of BSM models. It is expected that the LHC should be able to see evidence for a Z' arising from a large variety of BSM models up to a mass of ~5 TeV when the LHC reaches its design energy and luminosity, and up to ~6 TeV with the high luminosity upgrade. Further into the future, the high energy LHC would substantially extend this reach to ~11 TeV, while the ~100 TeV VHE-LHC could see evidence for Z' 's up to ~30 TeV. |
0710.2484 | Jose Ramon Espinosa | J.R. Espinosa, G. Giudice and A. Riotto | Cosmological implications of the Higgs mass measurement | 28 LaTeX pages, 6 figures | JCAP 0805:002,2008 | 10.1088/1475-7516/2008/05/002 | CERN-PH-TH/2007-179, IFT-UAM/CSIC-07-50 | hep-ph astro-ph hep-th | null | We assume the validity of the Standard Model up to an arbitrary high-energy
scale and discuss what information on the early stages of the Universe can be
extracted from a measurement of the Higgs mass. For Mh < 130 GeV, the Higgs
potential can develop an instability at large field values. From the absence of
excessive thermal Higgs field fluctuations we derive a bound on the reheat
temperature after inflation as a function of the Higgs and top masses. Then we
discuss the interplay between the quantum Higgs fluctuations generated during
the primordial stage of inflation and the cosmological perturbations, in the
context of landscape scenarios in which the inflationary parameters scan. We
show that, within the large-field models of inflation, it is highly improbable
to obtain the observed cosmological perturbations in a Universe with a light
Higgs. Moreover, independently of the inflationary model, the detection of
primordial tensor perturbations through the B-mode of CMB polarization and the
discovery of a light Higgs can simultaneously occur only with exponentially
small probability, unless there is new physics beyond the Standard Model.
| [
{
"created": "Fri, 12 Oct 2007 15:26:10 GMT",
"version": "v1"
}
] | 2009-01-06 | [
[
"Espinosa",
"J. R.",
""
],
[
"Giudice",
"G.",
""
],
[
"Riotto",
"A.",
""
]
] | We assume the validity of the Standard Model up to an arbitrary high-energy scale and discuss what information on the early stages of the Universe can be extracted from a measurement of the Higgs mass. For Mh < 130 GeV, the Higgs potential can develop an instability at large field values. From the absence of excessive thermal Higgs field fluctuations we derive a bound on the reheat temperature after inflation as a function of the Higgs and top masses. Then we discuss the interplay between the quantum Higgs fluctuations generated during the primordial stage of inflation and the cosmological perturbations, in the context of landscape scenarios in which the inflationary parameters scan. We show that, within the large-field models of inflation, it is highly improbable to obtain the observed cosmological perturbations in a Universe with a light Higgs. Moreover, independently of the inflationary model, the detection of primordial tensor perturbations through the B-mode of CMB polarization and the discovery of a light Higgs can simultaneously occur only with exponentially small probability, unless there is new physics beyond the Standard Model. |
1008.0033 | James D. Bjorken | J. D. Bjorken | Emergent Photons and Gravitons:The Problem of Vacuum Structure | Talk presented at the Fifth Meeting on CPT and Lorentz Symmetry,
University of Indiana, June 28-July 2, 2010 | null | 10.1142/9789814327688_0001 | null | hep-ph gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We discuss vacuum condensates associated with emergent QED and with torsion,
as well as the possible role of the Kodama wave function in quantum cosmology.
| [
{
"created": "Fri, 30 Jul 2010 23:32:23 GMT",
"version": "v1"
}
] | 2017-08-23 | [
[
"Bjorken",
"J. D.",
""
]
] | We discuss vacuum condensates associated with emergent QED and with torsion, as well as the possible role of the Kodama wave function in quantum cosmology. |
1811.00560 | Andrew Spray | Kenji Kadota, Andrew Spray | Electroweak Multiplet Dark Matter at Future Lepton Colliders | 24 pages, 14 figures; version 2, additional references | null | 10.1007/JHEP02(2019)017 | CTPU-PTC-18-32 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | An electroweak multiplet stable due to a new global symmetry is a simple and
well-motivated candidate for thermal dark matter. We study how direct searches
at a future linear collider, such as the proposed CLIC, can constrain scalar
and fermion triplets, quintets and septets, as well as a fermion doublet. The
phenomenology is highly sensitive to charged state lifetimes and thus the mass
splitting between the members of the multiplet. We include both radiative
corrections and the effect of non-renormalisable operators on this splitting.
In order to explore the full range of charged state lifetimes, we consider
signals including long-lived charged particles, disappearing tracks, and
monophotons. By combining the different searches we find discovery and
exclusion contours in the mass-lifetime plane. In particular, when the mass
splitting is generated purely through radiative corrections, we can exclude the
pure-Higgsino doublet below 310 GeV, the pure-wino triplet below 775 GeV, and
the minimal dark matter fermion quintet below 1025 GeV. The scenario where the
thermal relic abundance of a Higgsino accounts for the whole dark matter of the
Universe can be excluded if the mass splitting between the charged and neutral
states is less than 230 MeV. Finally, we discuss possible improvements to these
limits by using associated hard leptons to idenify the soft visible decay
products of the charged members of the dark matter multiplet.
| [
{
"created": "Thu, 1 Nov 2018 18:00:03 GMT",
"version": "v1"
},
{
"created": "Mon, 12 Nov 2018 12:31:51 GMT",
"version": "v2"
}
] | 2019-02-20 | [
[
"Kadota",
"Kenji",
""
],
[
"Spray",
"Andrew",
""
]
] | An electroweak multiplet stable due to a new global symmetry is a simple and well-motivated candidate for thermal dark matter. We study how direct searches at a future linear collider, such as the proposed CLIC, can constrain scalar and fermion triplets, quintets and septets, as well as a fermion doublet. The phenomenology is highly sensitive to charged state lifetimes and thus the mass splitting between the members of the multiplet. We include both radiative corrections and the effect of non-renormalisable operators on this splitting. In order to explore the full range of charged state lifetimes, we consider signals including long-lived charged particles, disappearing tracks, and monophotons. By combining the different searches we find discovery and exclusion contours in the mass-lifetime plane. In particular, when the mass splitting is generated purely through radiative corrections, we can exclude the pure-Higgsino doublet below 310 GeV, the pure-wino triplet below 775 GeV, and the minimal dark matter fermion quintet below 1025 GeV. The scenario where the thermal relic abundance of a Higgsino accounts for the whole dark matter of the Universe can be excluded if the mass splitting between the charged and neutral states is less than 230 MeV. Finally, we discuss possible improvements to these limits by using associated hard leptons to idenify the soft visible decay products of the charged members of the dark matter multiplet. |
0708.4126 | Graeme Watt | G. Watt, A. D. Martin, M. G. Ryskin | Diffractive parton distributions: the role of the perturbative Pomeron | 8 pages, 4 figures. To appear in the proceedings of the 12th
International Conference on Elastic and Diffractive Scattering: Forward
Physics and QCD, DESY, Hamburg, Germany, 21-25 May 2007 | null | null | IPPP-07-52, DCPT-07-104 | hep-ph | null | We consider the role of the perturbative Pomeron-to-parton splitting in the
formation of the diffractive parton distributions.
| [
{
"created": "Thu, 30 Aug 2007 11:13:20 GMT",
"version": "v1"
}
] | 2007-08-31 | [
[
"Watt",
"G.",
""
],
[
"Martin",
"A. D.",
""
],
[
"Ryskin",
"M. G.",
""
]
] | We consider the role of the perturbative Pomeron-to-parton splitting in the formation of the diffractive parton distributions. |
1810.12117 | Egle Tomasi-Gustafsson | G. I. Gakh, A. G. Gakh, and E. Tomasi-Gustafsson | General analysis of polarization effects in coherent pseudoscalar mesons
photo-- and electroproduction on deuteron | 40 pages, 5 figures. arXiv admin note: substantial text overlap with
arXiv:0812.3522, arXiv:hep-ph/0412112 | Phys. Rev. C 100, 025202 (2019) | 10.1103/PhysRevC.100.025202 | null | hep-ph nucl-th | http://creativecommons.org/licenses/by/4.0/ | General expressions for the unpolarized differential cross section and for
various polarization observables in the coherent pseudoscalar meson photo- and
electroproduction on the deuteron target have been obtained in
one-photon-exchange approximation. The spin structure of the matrix element is
explicitly derived in terms of structure functions. The correspondence with the
helicity amplitudes is given. The polarization effects have been investigated
for the case of a longitudinally polarized electron beam and vector or tensor
polarized deuteron target. The polarization (vector or tensor) of the scattered
deuteron for the case of unpolarized or a longitudinally polarized electron
beam is also considered. In the case of the photoproduction reaction, we
consider linearly, circularly or elliptically polarized photon beam. Numerical
estimations have been done for the unpolarized differential cross section and
for some polarization observables.
| [
{
"created": "Fri, 26 Oct 2018 12:37:50 GMT",
"version": "v1"
}
] | 2019-08-07 | [
[
"Gakh",
"G. I.",
""
],
[
"Gakh",
"A. G.",
""
],
[
"Tomasi-Gustafsson",
"E.",
""
]
] | General expressions for the unpolarized differential cross section and for various polarization observables in the coherent pseudoscalar meson photo- and electroproduction on the deuteron target have been obtained in one-photon-exchange approximation. The spin structure of the matrix element is explicitly derived in terms of structure functions. The correspondence with the helicity amplitudes is given. The polarization effects have been investigated for the case of a longitudinally polarized electron beam and vector or tensor polarized deuteron target. The polarization (vector or tensor) of the scattered deuteron for the case of unpolarized or a longitudinally polarized electron beam is also considered. In the case of the photoproduction reaction, we consider linearly, circularly or elliptically polarized photon beam. Numerical estimations have been done for the unpolarized differential cross section and for some polarization observables. |
0710.1693 | S. Descotes-Genon | S. Descotes-Genon (Orsay, LPT) | Connecting B_d and B_s decays through QCD factorisation and flavour
symmetries | Proceedings of the EPS-HEP 2007 Conference, Manchester (UK). 3 pages,
1 figure | null | 10.1088/1742-6596/110/2/022009 | LPT-ORSAY 07-77 | hep-ph | null | We analyse B_{d,s} -> K(*)0 K(*)0 modes within the SM, relating them in a
controlled way through SU(3)-flavour symmetry and QCD-improved factorisation.
We propose a set of sum rules for such penguin-mediated decays to constrain
some CKM angles. We determine B_s -> KK branching ratios and CP-asymmetries as
functions of A_{dir}(B_d -> K0 \bar{K}0). Applying the same techniques to
B_{d,s}-> K*0 \bar{K}*0, we outline strategies to determine the B_s mixing
angle.
| [
{
"created": "Tue, 9 Oct 2007 08:22:56 GMT",
"version": "v1"
}
] | 2009-11-13 | [
[
"Descotes-Genon",
"S.",
"",
"Orsay, LPT"
]
] | We analyse B_{d,s} -> K(*)0 K(*)0 modes within the SM, relating them in a controlled way through SU(3)-flavour symmetry and QCD-improved factorisation. We propose a set of sum rules for such penguin-mediated decays to constrain some CKM angles. We determine B_s -> KK branching ratios and CP-asymmetries as functions of A_{dir}(B_d -> K0 \bar{K}0). Applying the same techniques to B_{d,s}-> K*0 \bar{K}*0, we outline strategies to determine the B_s mixing angle. |
hep-ph/9803219 | R. Sekhar Chivukula | R. Sekhar Chivukula | Models of Electroweak Symmetry Breaking | 73 pages, 74 figures. Lectures presented at 1997 Les Houches Summer
School (not 1998) | null | null | BUHEP-98-5 | hep-ph hep-ex | null | Discovering the dynamics responsible for electroweak symmetry breaking is the
outstanding question facing particle physics today, and the answer will be
found in the next decade. In these lectures I discuss the range of models which
have been proposed to explain electroweak symmetry breaking. I begin with an
overview of Higgs models, with emphasis on the naturalness/hierarchy and
triviality problems, and then consider general lessons which can be drawn about
the symmetry breaking sector in arbitrary scalar models. Subsequently, I
discuss the symmetry breaking sector in supersymmetric models and then consider
models of dynamical electroweak symmetry breaking. I conclude with a brief
review of the open questions.
| [
{
"created": "Mon, 2 Mar 1998 18:32:57 GMT",
"version": "v1"
},
{
"created": "Tue, 3 Mar 1998 13:15:47 GMT",
"version": "v2"
}
] | 2007-05-23 | [
[
"Chivukula",
"R. Sekhar",
""
]
] | Discovering the dynamics responsible for electroweak symmetry breaking is the outstanding question facing particle physics today, and the answer will be found in the next decade. In these lectures I discuss the range of models which have been proposed to explain electroweak symmetry breaking. I begin with an overview of Higgs models, with emphasis on the naturalness/hierarchy and triviality problems, and then consider general lessons which can be drawn about the symmetry breaking sector in arbitrary scalar models. Subsequently, I discuss the symmetry breaking sector in supersymmetric models and then consider models of dynamical electroweak symmetry breaking. I conclude with a brief review of the open questions. |
hep-ph/0602198 | Christophe Grojean | B.C. Allanach (ed.), C. Grojean (ed.), P. Skands (ed.), E. Accomando,
G. Azuelos, H. Baer, C. Balazs, G. Belanger, K. Benakli, F. Boudjema, B.
Brelier, V. Bunichev, G. Cacciapaglia, M. Carena, D. Choudhury, P.-A.
Delsart, U. De Sanctis, K. Desch, B.A. Dobrescu, L. Dudko, M. El Kacimi, U.
Ellwanger, S. Ferrag, A. Finch, F. Franke, H. Fraas, A. Freitas, P. Gambino,
N. Ghodbane, R.M. Godbole, D. Goujdami, Ph. Gris, J. Guasch, M. Guchait, T.
Hahn, S. Heinemeyer, A. Hektor, S. Hesselbach, W. Hollik, C. Hugonie, T.
Hurth, J. Idarraga, O. Jinnouchi, J. Kalinowski, J.-L. Kneur, S. Kraml, M.
Kadastik, K. Kannike, R. Lafaye, G. Landsberg, T. Lari, J. S. Lee, J. Lykken,
F. Mahmoudi, M. Mangano, A. Menon, D.J. Miller, T. Millet, C. Milstene, S.
Montesano, F. Moortgat, G. Moortgat-Pick, S. Moretti, D.E. Morrissey, S.
Muanza, M.M. Muhlleitner, M. Muntel, H. Nowak, T. Ohl, S. Penaranda, M.
Perelstein, E. Perez, S. Perries, M. Peskin, J. Petzoldt, A. Pilaftsis, T.
Plehn, G. Polesello, A. Pompos, W. Porod, H. Przysiezniak, A. Pukhov, M.
Raidal, D. Rainwater, A.R. Raklev, J. Rathsman, J. Reuter, P. Richardson,
S.D. Rindani, K. Rolbiecki, H. Rzehak, M. Schumacher, S. Schumann, A.
Semenov, L. Serin, G. Servant, C.H. Shepherd-Themistocleous, S. Sherstnev, L.
Silvestrini, R.K. Singh, P. Slavich, M. Spira, A. Sopczak, K. Sridhar, L.
Tompkins, C. Troncon, S. Tsuno, K. Wagh, C.E.M. Wagner, G. Weiglein, P.
Wienemann, D. Zerwas, V. Zhukov | Les Houches "Physics at TeV Colliders 2005'' Beyond the Standard Model
working group: summary report | 269 pages, 165 figures. Web page of the workshop (with links to the
talks): http://lappweb.in2p3.fr/conferences/LesHouches/Houches2005/ | null | null | null | hep-ph | null | The work contained herein constitutes a report of the "Beyond the Standard
Model'' working group for the Workshop "Physics at TeV Colliders", Les Houches,
France, 2-20 May, 2005. We present reviews of current topics as well as
original research carried out for the workshop. Supersymmetric and
non-supersymmetric models are studied, as well as computational tools designed
in order to facilitate their phenomenology.
| [
{
"created": "Tue, 21 Feb 2006 18:55:47 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Allanach",
"B. C.",
"",
"ed."
],
[
"Grojean",
"C.",
"",
"ed."
],
[
"Skands",
"P.",
"",
"ed."
],
[
"Accomando",
"E.",
""
],
[
"Azuelos",
"G.",
""
],
[
"Baer",
"H.",
""
],
[
"Balazs",
"C.",
""
],
[
"Belanger",
"G.",
""
],
[
"Benakli",
"K.",
""
],
[
"Boudjema",
"F.",
""
],
[
"Brelier",
"B.",
""
],
[
"Bunichev",
"V.",
""
],
[
"Cacciapaglia",
"G.",
""
],
[
"Carena",
"M.",
""
],
[
"Choudhury",
"D.",
""
],
[
"Delsart",
"P. -A.",
""
],
[
"De Sanctis",
"U.",
""
],
[
"Desch",
"K.",
""
],
[
"Dobrescu",
"B. A.",
""
],
[
"Dudko",
"L.",
""
],
[
"Kacimi",
"M. El",
""
],
[
"Ellwanger",
"U.",
""
],
[
"Ferrag",
"S.",
""
],
[
"Finch",
"A.",
""
],
[
"Franke",
"F.",
""
],
[
"Fraas",
"H.",
""
],
[
"Freitas",
"A.",
""
],
[
"Gambino",
"P.",
""
],
[
"Ghodbane",
"N.",
""
],
[
"Godbole",
"R. M.",
""
],
[
"Goujdami",
"D.",
""
],
[
"Gris",
"Ph.",
""
],
[
"Guasch",
"J.",
""
],
[
"Guchait",
"M.",
""
],
[
"Hahn",
"T.",
""
],
[
"Heinemeyer",
"S.",
""
],
[
"Hektor",
"A.",
""
],
[
"Hesselbach",
"S.",
""
],
[
"Hollik",
"W.",
""
],
[
"Hugonie",
"C.",
""
],
[
"Hurth",
"T.",
""
],
[
"Idarraga",
"J.",
""
],
[
"Jinnouchi",
"O.",
""
],
[
"Kalinowski",
"J.",
""
],
[
"Kneur",
"J. -L.",
""
],
[
"Kraml",
"S.",
""
],
[
"Kadastik",
"M.",
""
],
[
"Kannike",
"K.",
""
],
[
"Lafaye",
"R.",
""
],
[
"Landsberg",
"G.",
""
],
[
"Lari",
"T.",
""
],
[
"Lee",
"J. S.",
""
],
[
"Lykken",
"J.",
""
],
[
"Mahmoudi",
"F.",
""
],
[
"Mangano",
"M.",
""
],
[
"Menon",
"A.",
""
],
[
"Miller",
"D. J.",
""
],
[
"Millet",
"T.",
""
],
[
"Milstene",
"C.",
""
],
[
"Montesano",
"S.",
""
],
[
"Moortgat",
"F.",
""
],
[
"Moortgat-Pick",
"G.",
""
],
[
"Moretti",
"S.",
""
],
[
"Morrissey",
"D. E.",
""
],
[
"Muanza",
"S.",
""
],
[
"Muhlleitner",
"M. M.",
""
],
[
"Muntel",
"M.",
""
],
[
"Nowak",
"H.",
""
],
[
"Ohl",
"T.",
""
],
[
"Penaranda",
"S.",
""
],
[
"Perelstein",
"M.",
""
],
[
"Perez",
"E.",
""
],
[
"Perries",
"S.",
""
],
[
"Peskin",
"M.",
""
],
[
"Petzoldt",
"J.",
""
],
[
"Pilaftsis",
"A.",
""
],
[
"Plehn",
"T.",
""
],
[
"Polesello",
"G.",
""
],
[
"Pompos",
"A.",
""
],
[
"Porod",
"W.",
""
],
[
"Przysiezniak",
"H.",
""
],
[
"Pukhov",
"A.",
""
],
[
"Raidal",
"M.",
""
],
[
"Rainwater",
"D.",
""
],
[
"Raklev",
"A. R.",
""
],
[
"Rathsman",
"J.",
""
],
[
"Reuter",
"J.",
""
],
[
"Richardson",
"P.",
""
],
[
"Rindani",
"S. D.",
""
],
[
"Rolbiecki",
"K.",
""
],
[
"Rzehak",
"H.",
""
],
[
"Schumacher",
"M.",
""
],
[
"Schumann",
"S.",
""
],
[
"Semenov",
"A.",
""
],
[
"Serin",
"L.",
""
],
[
"Servant",
"G.",
""
],
[
"Shepherd-Themistocleous",
"C. H.",
""
],
[
"Sherstnev",
"S.",
""
],
[
"Silvestrini",
"L.",
""
],
[
"Singh",
"R. K.",
""
],
[
"Slavich",
"P.",
""
],
[
"Spira",
"M.",
""
],
[
"Sopczak",
"A.",
""
],
[
"Sridhar",
"K.",
""
],
[
"Tompkins",
"L.",
""
],
[
"Troncon",
"C.",
""
],
[
"Tsuno",
"S.",
""
],
[
"Wagh",
"K.",
""
],
[
"Wagner",
"C. E. M.",
""
],
[
"Weiglein",
"G.",
""
],
[
"Wienemann",
"P.",
""
],
[
"Zerwas",
"D.",
""
],
[
"Zhukov",
"V.",
""
]
] | The work contained herein constitutes a report of the "Beyond the Standard Model'' working group for the Workshop "Physics at TeV Colliders", Les Houches, France, 2-20 May, 2005. We present reviews of current topics as well as original research carried out for the workshop. Supersymmetric and non-supersymmetric models are studied, as well as computational tools designed in order to facilitate their phenomenology. |
1811.05487 | Michele Maltoni | Ivan Esteban, M.C. Gonzalez-Garcia, Alvaro Hernandez-Cabezudo, Michele
Maltoni, Thomas Schwetz | Global analysis of three-flavour neutrino oscillations: synergies and
tensions in the determination of theta_23, delta_CP, and the mass ordering | 35 pages, 14 figures, 2 tables. Updated results of the global fit
will be available at http://www.nu-fit.org | JHEP 01 (2019) 106 | 10.1007/JHEP01(2019)106 | IFT-UAM/CSIC-18-112, YITP-SB-18-34 | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present the results of a global analysis of the neutrino oscillation data
available as of fall 2018 in the framework of three massive mixed neutrinos
with the goal at determining the ranges of allowed values for the six relevant
parameters. We describe the complementarity and quantify the tensions among the
results of the different data samples contributing to the determination of each
parameter. We also show how those vary when combining our global likelihood
with the chi^2 map provided by Super-Kamiokande for their atmospheric neutrino
data analysis in the same framework. The best fit of the analysis is for the
normal mass ordering with inverted ordering being disfavoured with a
Delta_chi^2 = 4.7 (9.3) without (with) SK-atm. We find a preference for the
second octant of theta_23, disfavouring the first octant with Delta_chi^2 = 4.4
(6.0) without (with) SK-atm. The best fit for the complex phase is Delta_CP =
215_deg with CP conservation being allowed at Delta_chi^2 = 1.5 (1.8). As a
byproduct we quantify the correlated ranges for the laboratory observables
sensitive to the absolute neutrino mass scale in beta decay, m_nu_e, and
neutrino-less double beta decay, m_ee, and the total mass of the neutrinos,
Sigma, which is most relevant in Cosmology.
| [
{
"created": "Tue, 13 Nov 2018 19:00:07 GMT",
"version": "v1"
}
] | 2019-02-19 | [
[
"Esteban",
"Ivan",
""
],
[
"Gonzalez-Garcia",
"M. C.",
""
],
[
"Hernandez-Cabezudo",
"Alvaro",
""
],
[
"Maltoni",
"Michele",
""
],
[
"Schwetz",
"Thomas",
""
]
] | We present the results of a global analysis of the neutrino oscillation data available as of fall 2018 in the framework of three massive mixed neutrinos with the goal at determining the ranges of allowed values for the six relevant parameters. We describe the complementarity and quantify the tensions among the results of the different data samples contributing to the determination of each parameter. We also show how those vary when combining our global likelihood with the chi^2 map provided by Super-Kamiokande for their atmospheric neutrino data analysis in the same framework. The best fit of the analysis is for the normal mass ordering with inverted ordering being disfavoured with a Delta_chi^2 = 4.7 (9.3) without (with) SK-atm. We find a preference for the second octant of theta_23, disfavouring the first octant with Delta_chi^2 = 4.4 (6.0) without (with) SK-atm. The best fit for the complex phase is Delta_CP = 215_deg with CP conservation being allowed at Delta_chi^2 = 1.5 (1.8). As a byproduct we quantify the correlated ranges for the laboratory observables sensitive to the absolute neutrino mass scale in beta decay, m_nu_e, and neutrino-less double beta decay, m_ee, and the total mass of the neutrinos, Sigma, which is most relevant in Cosmology. |
hep-ph/0411319 | Marcus Bluhm | M.Bluhm, B. Kampfer (Rossendorf, Forschungszentrum), G. Soff (Dresden,
Tech. U.) | Quasi-particle model of strongly interacting matter | Nov 2004. 4pp. Invited talk given at 8th International Conference on
Strangeness in Quark Matter (SQM2004), Cape Town, South Africa, 15-20 Sep
2004 | J.Phys. G31 (2005) S1151-S1154 | 10.1088/0954-3899/31/6/077 | null | hep-ph | null | The successful quasi-particle model is compared with recent lattice data of
the coefficients in the Taylor series expansion of the excess pressure at
finite temperature and baryon density. A chain of approximations, starting from
QCD to arrive at the model expressions for the entropy density, is presented.
| [
{
"created": "Wed, 24 Nov 2004 08:45:30 GMT",
"version": "v1"
},
{
"created": "Mon, 24 Jan 2005 15:45:48 GMT",
"version": "v2"
}
] | 2009-11-10 | [
[
"Bluhm",
"M.",
"",
"Rossendorf, Forschungszentrum"
],
[
"Kampfer",
"B.",
"",
"Rossendorf, Forschungszentrum"
],
[
"Soff",
"G.",
"",
"Dresden,\n Tech. U."
]
] | The successful quasi-particle model is compared with recent lattice data of the coefficients in the Taylor series expansion of the excess pressure at finite temperature and baryon density. A chain of approximations, starting from QCD to arrive at the model expressions for the entropy density, is presented. |
1407.8539 | Luigi Delle Rose | Claudio Coriano, Luigi Delle Rose and Carlo Marzo | Vacuum Stability in U(1)-Prime Extensions of the Standard Model with TeV
Scale Right Handed Neutrinos | 15 pages, 16 figures, accepted for publication on PLB | null | 10.1016/j.physletb.2014.09.001 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We investigate a minimal $U(1)'$ extension of the Standard Model with one
extra complex scalar and generic gauge charge assignments. We use a type-I
seesaw mechanism with three heavy right handed neutrinos to illustrate the
constraints on the charges, on their mass and on the mixing angle of the two
scalars, derived by requiring the vacuum stability of the scalar potential. We
focus our study on a scenario which could be accessible at the LHC, by
selecting a vacuum expectation value of the extra Higgs in the TeV range and
determining the constraints that emerge in the parameter space. To illustrate
the generality of the approach, specific gauge choices corresponding to
$U(1)_{B-L}, U(1)_R$ and $U(1)_\chi$ are separately analyzed. Our results are
based on a modified expression of one of the $\beta$ functions of the quartic
couplings of the scalar potential compared to the previous literature. This is
due to a change in the coefficient of the Yukawa term of the right handed
neutrinos. Differently from previous analysis, we show that this coupling may
destabilize the vacuum.
| [
{
"created": "Thu, 31 Jul 2014 19:17:46 GMT",
"version": "v1"
},
{
"created": "Fri, 1 Aug 2014 11:59:45 GMT",
"version": "v2"
},
{
"created": "Tue, 2 Sep 2014 10:31:22 GMT",
"version": "v3"
}
] | 2015-06-22 | [
[
"Coriano",
"Claudio",
""
],
[
"Rose",
"Luigi Delle",
""
],
[
"Marzo",
"Carlo",
""
]
] | We investigate a minimal $U(1)'$ extension of the Standard Model with one extra complex scalar and generic gauge charge assignments. We use a type-I seesaw mechanism with three heavy right handed neutrinos to illustrate the constraints on the charges, on their mass and on the mixing angle of the two scalars, derived by requiring the vacuum stability of the scalar potential. We focus our study on a scenario which could be accessible at the LHC, by selecting a vacuum expectation value of the extra Higgs in the TeV range and determining the constraints that emerge in the parameter space. To illustrate the generality of the approach, specific gauge choices corresponding to $U(1)_{B-L}, U(1)_R$ and $U(1)_\chi$ are separately analyzed. Our results are based on a modified expression of one of the $\beta$ functions of the quartic couplings of the scalar potential compared to the previous literature. This is due to a change in the coefficient of the Yukawa term of the right handed neutrinos. Differently from previous analysis, we show that this coupling may destabilize the vacuum. |
hep-ph/9311299 | Andreas Wirzba | A. Wirzba, M. Kirchbach and D.O. Riska | Higher Resonance Contributions to the Adler-Weisberger Sum Rule in the
Large N_c Limit | 10 pages, LaTeX, TH Darmstadt preprint IKDA 93/47, REVISED | J.Phys.G20:1583-1590,1994 | 10.1088/0954-3899/20/10/005 | null | hep-ph nucl-th | null | We determine the $N_c$--dependence of the resonance contributions to the
Adler--Weisberger sum rule for the inverse square $1/g_A^2$ of the axial charge
coupling constant and show that in the large $N_c$ limit the contributions of
the Roper-like excitations scale as $O(1/N_c)$. Consistency with the $1/N_c^2$
scaling of the $1/g_A^2$ term in the sum rule requires these contributions to
cancel against each other.
| [
{
"created": "Tue, 16 Nov 1993 10:25:41 GMT",
"version": "v1"
},
{
"created": "Tue, 18 Jan 1994 12:55:06 GMT",
"version": "v2"
}
] | 2011-08-17 | [
[
"Wirzba",
"A.",
""
],
[
"Kirchbach",
"M.",
""
],
[
"Riska",
"D. O.",
""
]
] | We determine the $N_c$--dependence of the resonance contributions to the Adler--Weisberger sum rule for the inverse square $1/g_A^2$ of the axial charge coupling constant and show that in the large $N_c$ limit the contributions of the Roper-like excitations scale as $O(1/N_c)$. Consistency with the $1/N_c^2$ scaling of the $1/g_A^2$ term in the sum rule requires these contributions to cancel against each other. |
hep-ph/9903463 | Dave Rainwater | D. Rainwater | Searching for VV -> H -> tau tau at the CERN LHC | 5 pages, LaTex, RevTeX, to appear in DPF99 proceedings | null | null | null | hep-ph | null | The production of a neutral, CP even Higgs via weak boson fusion and decay H
-> tau tau at the LHC is studied for the Standard Model and MSSM, utilizing a
parton level Monte Carlo analysis. This channel allows a 5 sigma observation of
a Standard Model Higgs with an integrated luminosity of about 30 fb^-1, and
provides a direct measurement of the H-tau-tau coupling. For the MSSM case, a
highly significant signal for at least one of the Higgs bosons with reasonable
luminosity is possible over the entire physical parameter space which will be
left unexplored by LEP2.
| [
{
"created": "Wed, 24 Mar 1999 00:43:40 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Rainwater",
"D.",
""
]
] | The production of a neutral, CP even Higgs via weak boson fusion and decay H -> tau tau at the LHC is studied for the Standard Model and MSSM, utilizing a parton level Monte Carlo analysis. This channel allows a 5 sigma observation of a Standard Model Higgs with an integrated luminosity of about 30 fb^-1, and provides a direct measurement of the H-tau-tau coupling. For the MSSM case, a highly significant signal for at least one of the Higgs bosons with reasonable luminosity is possible over the entire physical parameter space which will be left unexplored by LEP2. |
1912.01672 | Dibyashree Sengupta | Howard Baer, Vernon Barger and Dibyashree Sengupta | Mirage mediation from the landscape | 25 pages, 19 figures | Phys. Rev. Research 2, 013346 (2020) | 10.1103/PhysRevResearch.2.013346 | OU-HEP-191104 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Rather general considerations from the string theory landscape suggest a
statistical preference within the multiverse for soft SUSY breaking terms as
large as possible subject to a pocket universe value for the weak scale not
greater than a factor of 2-5 from our measured value. Within the
gravity/moduli-mediated SUSY breaking framework, the Higgs mass is pulled to
m_h~ 125 GeV while first/second generation scalars are pulled to tens of TeV
scale and gauginos and third generation scalars remain at the few TeV range. In
this case, one then expects comparable moduli- and anomaly-mediated
contributions to soft terms, leading to mirage mediation. For an assumed
stringy natural value of the SUSY mu parameter, we evaluate predicted sparticle
mass spectra for mirage mediation from a statistical scan of the string
landscape. We then expect a compressed spectrum of gauginos along with a
higgsino-like LSP. For a linear (quadratic) statistical draw with gravitino
mass m_{3/2}~ 20 TeV, then the most probable mirage scale is predicted to be
around \mu_{mir}~10^{13} (10^{14}) GeV. SUSY should appear at high-luminosity
LHC via higgsino pair production into soft dilepton pairs. Distinguishing
mirage mediation from models with unified gaugino masses may have to await
construction of an ILC with \sqrt{s}>2m(higgsino).
| [
{
"created": "Tue, 3 Dec 2019 20:17:26 GMT",
"version": "v1"
}
] | 2020-03-25 | [
[
"Baer",
"Howard",
""
],
[
"Barger",
"Vernon",
""
],
[
"Sengupta",
"Dibyashree",
""
]
] | Rather general considerations from the string theory landscape suggest a statistical preference within the multiverse for soft SUSY breaking terms as large as possible subject to a pocket universe value for the weak scale not greater than a factor of 2-5 from our measured value. Within the gravity/moduli-mediated SUSY breaking framework, the Higgs mass is pulled to m_h~ 125 GeV while first/second generation scalars are pulled to tens of TeV scale and gauginos and third generation scalars remain at the few TeV range. In this case, one then expects comparable moduli- and anomaly-mediated contributions to soft terms, leading to mirage mediation. For an assumed stringy natural value of the SUSY mu parameter, we evaluate predicted sparticle mass spectra for mirage mediation from a statistical scan of the string landscape. We then expect a compressed spectrum of gauginos along with a higgsino-like LSP. For a linear (quadratic) statistical draw with gravitino mass m_{3/2}~ 20 TeV, then the most probable mirage scale is predicted to be around \mu_{mir}~10^{13} (10^{14}) GeV. SUSY should appear at high-luminosity LHC via higgsino pair production into soft dilepton pairs. Distinguishing mirage mediation from models with unified gaugino masses may have to await construction of an ILC with \sqrt{s}>2m(higgsino). |
1604.00095 | Zi-qiang Zhang | Zi-qiang Zhang, De-fu Hou, Yan Wu and Gang Chen | Holographic Schwinger effect in a confining D3-brane background with
chemical potential | 7 pages, 4 figures | Advances in High Energy Physics, Volume 2016, Article ID 9258106 | 10.1155/2016/9258106 | Article ID 9258106 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Using the AdS/CFT correspondence, we investigate the Schwinger effect in a
confining D3-brane background with chemical potential. The potential between a
test particle pair on the D3-brane in an external electric field is obtained.
The critical field $E_c$ in this case is calculated. Also, we apply numerical
method to evaluate the production rate for various cases. The results imply
that the presence of chemical potential tends to suppress the pair production
effect.
| [
{
"created": "Fri, 1 Apr 2016 01:20:12 GMT",
"version": "v1"
},
{
"created": "Tue, 5 Jul 2016 03:42:07 GMT",
"version": "v2"
},
{
"created": "Sat, 17 Sep 2016 03:06:19 GMT",
"version": "v3"
}
] | 2016-09-20 | [
[
"Zhang",
"Zi-qiang",
""
],
[
"Hou",
"De-fu",
""
],
[
"Wu",
"Yan",
""
],
[
"Chen",
"Gang",
""
]
] | Using the AdS/CFT correspondence, we investigate the Schwinger effect in a confining D3-brane background with chemical potential. The potential between a test particle pair on the D3-brane in an external electric field is obtained. The critical field $E_c$ in this case is calculated. Also, we apply numerical method to evaluate the production rate for various cases. The results imply that the presence of chemical potential tends to suppress the pair production effect. |
1407.7387 | Carlos Merino | G.H. Arakelyan, C. Merino, and Yu.M. Shabelski | Hadroproduction of var(phi)-mesons in the Quark-Gluon String model | 11 pages and 7 figures | Phys. Rev. D 90, 114019 (2014) | 10.1103/PhysRevD.90.114019 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We consider the experimental data on var(phi)-meson production in
hadron-nucleon collisions for a wide energy region. The Quark-Gluon String
Model quantitatively describes the spectra of secondary var(phi), as well as
the ratios of var(phi)/pi^- and var(phi)/K^- production cross sections.
| [
{
"created": "Mon, 28 Jul 2014 11:39:01 GMT",
"version": "v1"
}
] | 2014-12-24 | [
[
"Arakelyan",
"G. H.",
""
],
[
"Merino",
"C.",
""
],
[
"Shabelski",
"Yu. M.",
""
]
] | We consider the experimental data on var(phi)-meson production in hadron-nucleon collisions for a wide energy region. The Quark-Gluon String Model quantitatively describes the spectra of secondary var(phi), as well as the ratios of var(phi)/pi^- and var(phi)/K^- production cross sections. |
0907.1451 | Gerhard Ecker | V. Cirigliano, G. Ecker and A. Pich | Reanalysis of pion pion phase shifts from K -> pi pi decays | 8 pages | Phys.Lett.B679:445-448,2009 | 10.1016/j.physletb.2009.08.027 | LA-UR 09-03948, UWThPh-2009-5, IFIC/09-24, FTUV/09-0709 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We re-investigate the impact of isospin violation for extracting the s-wave
pion pion scattering phase shift difference delta_0(M_K) - delta_2(M_K) from K
-> pi pi decays. Compared to our previous analysis in 2003, more precise
experimental data and improved knowledge of low-energy constants are used. In
addition, we employ a more robust data-driven method to obtain the phase shift
difference delta_0(M_K) - delta_2(M_K) = (52.5 \pm 0.8_{exp} \pm 2.8_{theor})
degrees.
| [
{
"created": "Thu, 9 Jul 2009 09:07:43 GMT",
"version": "v1"
}
] | 2009-09-28 | [
[
"Cirigliano",
"V.",
""
],
[
"Ecker",
"G.",
""
],
[
"Pich",
"A.",
""
]
] | We re-investigate the impact of isospin violation for extracting the s-wave pion pion scattering phase shift difference delta_0(M_K) - delta_2(M_K) from K -> pi pi decays. Compared to our previous analysis in 2003, more precise experimental data and improved knowledge of low-energy constants are used. In addition, we employ a more robust data-driven method to obtain the phase shift difference delta_0(M_K) - delta_2(M_K) = (52.5 \pm 0.8_{exp} \pm 2.8_{theor}) degrees. |
2211.01816 | Dinesh Kumar Singha | Dinesh Kumar Singha, Monojit Ghosh, Rudra Majhi, Rukmani Mohanta | Study of light sterile neutrino at the long-baseline experiment options
at KM3NeT | 21 pages, 7 figures, 2 tables, version accepted for publication in
Phys. Rev. D | null | 10.1103/PhysRevD.107.075039 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper, we study the capability of different long-baseline experiment
options at the KM3NeT facility i.e., P2O, Upgraded P2O and P2SO to probe the
light sterile neutrino and compare their sensitivities with DUNE. The P2O
option will have neutrinos from a 90 KW beam at Protvino to be detected at the
ORCA detector, the Upgraded P2O will have neutrinos from the upgraded 450 KW
beam to be detected at the ORCA detector and the option P2SO will have
neutrinos from a 450 KW beam to be detected at the upgraded Super-ORCA
detector. All these options will have a baseline around 2595 km. Our results
show that the experiments at the KM3NeT (DUNE) would be more sensitive if the
value of $\Delta m^2_{41}$ is around 10 (1) eV$^2$. Our results also show that
the role of near detector is very important for the study of sterile neutrinos
and addition of near detector improves the sensitivity as compared to only far
detector for 3+1 scenario. Among the three options at KM3NeT, the sensitivity
of P2O and upgraded P2O is limited and sensitivity of P2SO is either comparable
or better than DUNE.
| [
{
"created": "Thu, 3 Nov 2022 13:54:39 GMT",
"version": "v1"
},
{
"created": "Tue, 4 Apr 2023 19:50:21 GMT",
"version": "v2"
}
] | 2023-05-10 | [
[
"Singha",
"Dinesh Kumar",
""
],
[
"Ghosh",
"Monojit",
""
],
[
"Majhi",
"Rudra",
""
],
[
"Mohanta",
"Rukmani",
""
]
] | In this paper, we study the capability of different long-baseline experiment options at the KM3NeT facility i.e., P2O, Upgraded P2O and P2SO to probe the light sterile neutrino and compare their sensitivities with DUNE. The P2O option will have neutrinos from a 90 KW beam at Protvino to be detected at the ORCA detector, the Upgraded P2O will have neutrinos from the upgraded 450 KW beam to be detected at the ORCA detector and the option P2SO will have neutrinos from a 450 KW beam to be detected at the upgraded Super-ORCA detector. All these options will have a baseline around 2595 km. Our results show that the experiments at the KM3NeT (DUNE) would be more sensitive if the value of $\Delta m^2_{41}$ is around 10 (1) eV$^2$. Our results also show that the role of near detector is very important for the study of sterile neutrinos and addition of near detector improves the sensitivity as compared to only far detector for 3+1 scenario. Among the three options at KM3NeT, the sensitivity of P2O and upgraded P2O is limited and sensitivity of P2SO is either comparable or better than DUNE. |
hep-ph/9708425 | Bergerhoff Bastian | Bastian Bergerhoff, Christof Wetterich (ITEP, Univ. Heidelberg) | Effective Quark Interactions and QCD-Propagators | Revised version, to appear in Phys. Rev. D; Introduction rewritten, 1
figure added. 35 pages, including 10 figures; Latex2e | Phys.Rev. D57 (1998) 1591-1604 | 10.1103/PhysRevD.57.1591 | HD-THEP-97-46 | hep-ph nucl-th | null | We compute the momentum dependence of the effective four quark interaction in
QCD after integrating out the gluons. Our method is based on a truncation of
exact renormalization group equations which should give reasonable results for
momenta above the confinement scale. The difference between the four quark
interaction and the heavy quark potential can be minimized for an optimal
renormalization scheme in Landau gauge. Within the momentum range relevant for
quarkonia our results agree with phenomenological potentials. We also calculate
the propagators for gluons and ghosts in Landau-gauge.
| [
{
"created": "Thu, 21 Aug 1997 15:48:12 GMT",
"version": "v1"
},
{
"created": "Tue, 18 Nov 1997 10:21:25 GMT",
"version": "v2"
}
] | 2009-10-30 | [
[
"Bergerhoff",
"Bastian",
"",
"ITEP, Univ. Heidelberg"
],
[
"Wetterich",
"Christof",
"",
"ITEP, Univ. Heidelberg"
]
] | We compute the momentum dependence of the effective four quark interaction in QCD after integrating out the gluons. Our method is based on a truncation of exact renormalization group equations which should give reasonable results for momenta above the confinement scale. The difference between the four quark interaction and the heavy quark potential can be minimized for an optimal renormalization scheme in Landau gauge. Within the momentum range relevant for quarkonia our results agree with phenomenological potentials. We also calculate the propagators for gluons and ghosts in Landau-gauge. |
1912.08472 | Eric Madge | Jan Heisig, Michael Kr\"amer, Eric Madge, Alexander M\"uck | Probing Higgs-portal dark matter with vector-boson fusion | 22 pages, 8 figures, minor revisions in introduction and appendix,
version published in JHEP | JHEP 03 (2020) 183 | 10.1007/JHEP03(2020)183 | CP3-19-62, TTK-19-54, MITP/19-086 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We constrain the Higgs-portal model employing the vector-boson fusion channel
at the LHC. In particular, we include the phenomenologically interesting
parameter region near the Higgs resonance, where the Higgs-boson mass is close
to the threshold for dark-matter production and a running-width prescription
has to be employed for the Higgs-boson propagator. Limits for the Higgs-portal
coupling as a function of the dark-matter mass are derived from the CMS search
for invisible Higgs-boson decays in vector-boson fusion at 13 TeV. Furthermore,
we perform projections for the 14 TeV HL-LHC and the 27 TeV HE-LHC taking into
account a realistic estimate of the systematic uncertainties. The respective
upper limits on the invisible branching ratio of the Higgs boson reach a level
of 2 % and constrain perturbative Higgs-portal couplings up to dark-matter
masses of about 110 GeV.
| [
{
"created": "Wed, 18 Dec 2019 09:25:49 GMT",
"version": "v1"
},
{
"created": "Wed, 1 Apr 2020 09:41:07 GMT",
"version": "v2"
}
] | 2020-04-02 | [
[
"Heisig",
"Jan",
""
],
[
"Krämer",
"Michael",
""
],
[
"Madge",
"Eric",
""
],
[
"Mück",
"Alexander",
""
]
] | We constrain the Higgs-portal model employing the vector-boson fusion channel at the LHC. In particular, we include the phenomenologically interesting parameter region near the Higgs resonance, where the Higgs-boson mass is close to the threshold for dark-matter production and a running-width prescription has to be employed for the Higgs-boson propagator. Limits for the Higgs-portal coupling as a function of the dark-matter mass are derived from the CMS search for invisible Higgs-boson decays in vector-boson fusion at 13 TeV. Furthermore, we perform projections for the 14 TeV HL-LHC and the 27 TeV HE-LHC taking into account a realistic estimate of the systematic uncertainties. The respective upper limits on the invisible branching ratio of the Higgs boson reach a level of 2 % and constrain perturbative Higgs-portal couplings up to dark-matter masses of about 110 GeV. |
0706.3157 | Lorenzo Magnea | Matteo Cacciari, Mrinal Dasgupta, Lorenzo Magnea and Gavin Salam | Power corrections for jets at hadron colliders | 5 pages, 1 figure. Talk presented by L. Magnea at DIS 2007, Munich,
Germany, April 16-20 2007 | null | null | null | hep-ph | null | We discuss non-perturbative QCD corrections to jet distributions in hadron
collisions, focussing on hadronisation and underlying event contributions.
Using soft gluon resummation and Monte-Carlo modelling we show that
hadronisation dominates at small values of the jet radius R, behaving as 1/R,
while underlying event corrections grow with the jet area. This provides a
handle to disentangle them and parametrize them in terms of measurable QCD
parameters, which might enjoy a degree of universality.
| [
{
"created": "Thu, 21 Jun 2007 14:19:18 GMT",
"version": "v1"
}
] | 2007-06-22 | [
[
"Cacciari",
"Matteo",
""
],
[
"Dasgupta",
"Mrinal",
""
],
[
"Magnea",
"Lorenzo",
""
],
[
"Salam",
"Gavin",
""
]
] | We discuss non-perturbative QCD corrections to jet distributions in hadron collisions, focussing on hadronisation and underlying event contributions. Using soft gluon resummation and Monte-Carlo modelling we show that hadronisation dominates at small values of the jet radius R, behaving as 1/R, while underlying event corrections grow with the jet area. This provides a handle to disentangle them and parametrize them in terms of measurable QCD parameters, which might enjoy a degree of universality. |
1805.06903 | Anirban Biswas | Anirban Biswas, Debasish Borah, Arnab Dasgupta | A UV Complete Framework of Freeze-in Massive Particle Dark Matter | 28 pages, 7 figures, 2 tables, loop expressions corrected, conclusion
remains unaltered, two new appendices are added, | Phys. Rev. D 99, 015033 (2019) | 10.1103/PhysRevD.99.015033 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We propose a way to generate tiny couplings of freeze-in massive particle
dark matter with the Standard Model particles dynamically by considering an
extension of the electroweak gauge symmetry. The dark matter is considered to
be a singlet under this extended gauge symmetry which we have assumed to be the
one in a very widely studied scenario called left-right symmetric model.
Several heavy particles, that can be thermally inaccessible in the early
Universe due to their masses being greater than the reheat temperature after
inflation, can play the role of portals between dark matter and Standard Model
particles through one loop couplings. Due to the loop suppression, one can
generate the required non-thermal dark matter couplings without any need of
highly fine tuned Yukawa couplings beyond that of electron Yukawa with the
Standard Model like Higgs boson. We show that generic values of Yukawa
couplings as large as $\mathcal{O}(0.01)$ to $\mathcal{O}(1)$ can keep the dark
matter out of thermal equilibrium in the early Universe and produce the correct
relic abundance later through the freeze-in mechanism. Though the radiative
couplings of dark matter are tiny as required by the freeze-in scenario, the
associated rich particle sector of the model can be probed at ongoing and near
future experiments. The allowed values of dark matter mass can remain in a wide
range from keV to TeV order keeping the possibilities of warm and cold dark
matter equally possible.
| [
{
"created": "Thu, 17 May 2018 18:00:04 GMT",
"version": "v1"
},
{
"created": "Wed, 30 Jan 2019 07:40:03 GMT",
"version": "v2"
}
] | 2019-02-06 | [
[
"Biswas",
"Anirban",
""
],
[
"Borah",
"Debasish",
""
],
[
"Dasgupta",
"Arnab",
""
]
] | We propose a way to generate tiny couplings of freeze-in massive particle dark matter with the Standard Model particles dynamically by considering an extension of the electroweak gauge symmetry. The dark matter is considered to be a singlet under this extended gauge symmetry which we have assumed to be the one in a very widely studied scenario called left-right symmetric model. Several heavy particles, that can be thermally inaccessible in the early Universe due to their masses being greater than the reheat temperature after inflation, can play the role of portals between dark matter and Standard Model particles through one loop couplings. Due to the loop suppression, one can generate the required non-thermal dark matter couplings without any need of highly fine tuned Yukawa couplings beyond that of electron Yukawa with the Standard Model like Higgs boson. We show that generic values of Yukawa couplings as large as $\mathcal{O}(0.01)$ to $\mathcal{O}(1)$ can keep the dark matter out of thermal equilibrium in the early Universe and produce the correct relic abundance later through the freeze-in mechanism. Though the radiative couplings of dark matter are tiny as required by the freeze-in scenario, the associated rich particle sector of the model can be probed at ongoing and near future experiments. The allowed values of dark matter mass can remain in a wide range from keV to TeV order keeping the possibilities of warm and cold dark matter equally possible. |
hep-ph/0001270 | E. R. Berger | E. R. Berger, A. Donnachie, H. G. Dosch, O. Nachtmann | Observing the Odderon: Tensor Meson Photoproduction | 19 pages, 11 figures | Eur.Phys.J.C14:673-682,2000 | 10.1007/s100520000377 | HD--THEP-99-53, M/C--TH-99/19, LPT-ORSAY-99-106 | hep-ph | null | We calculate high-energy photoproduction of the tensor meson $f_2(1270)$ by
odderon and photon exchange in the reaction $\gamma + {\rm{p}} \to f_2(1270) +
{\rm{X}}$, where X is either the nucleon or the sum of the N(1520) and N(1535)
baryon resonances. Odderon exchange dominates except at very small transverse
momentum, and we find a cross section of about 20 nb at a centre-of-mass energy
of 20 GeV. This result is compared with what is currently known experimentally
about $f_2$ photoproduction. We conclude that odderon exchange is not ruled out
by present data. On the contrary, an odderon-induced cross section of the above
magnitude may help to explain a puzzling result observed by the E687
experiment.
| [
{
"created": "Wed, 26 Jan 2000 15:30:55 GMT",
"version": "v1"
}
] | 2016-09-06 | [
[
"Berger",
"E. R.",
""
],
[
"Donnachie",
"A.",
""
],
[
"Dosch",
"H. G.",
""
],
[
"Nachtmann",
"O.",
""
]
] | We calculate high-energy photoproduction of the tensor meson $f_2(1270)$ by odderon and photon exchange in the reaction $\gamma + {\rm{p}} \to f_2(1270) + {\rm{X}}$, where X is either the nucleon or the sum of the N(1520) and N(1535) baryon resonances. Odderon exchange dominates except at very small transverse momentum, and we find a cross section of about 20 nb at a centre-of-mass energy of 20 GeV. This result is compared with what is currently known experimentally about $f_2$ photoproduction. We conclude that odderon exchange is not ruled out by present data. On the contrary, an odderon-induced cross section of the above magnitude may help to explain a puzzling result observed by the E687 experiment. |
1506.06074 | Grzegorz Wilk | Grzegorz Wilk and Zbigniew Wlodarczyk | Superstatistical cluster decay | 7 pages, no figures. Version accepted for publication in Phys. Lett.
A (2015) | Phys. Lett. A 379 (2015) 2941 | null | null | hep-ph cond-mat.stat-mech | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We provide an overview of Tsallis statistics, presented as a special case of
superstatistics and applied to the multiparticle processes described by the
statistical cluster model. This model combines Boltzman statistics applied to
hadronization of clusters and superstatistics induced by fluctuations of their
Lorentz factors. It results in a Tsallis-like distribution of transverse
momenta with some scale, the origin of which is discussed. We show that this
distribution becomes a Tsallis distribution in a special case, namely when one
combines fluctuations of the Lorentz factor and temperature inside the cluster,
given by beta and gamma distributions, respectively.
| [
{
"created": "Fri, 19 Jun 2015 16:16:35 GMT",
"version": "v1"
},
{
"created": "Tue, 25 Aug 2015 11:11:06 GMT",
"version": "v2"
},
{
"created": "Wed, 26 Aug 2015 12:29:06 GMT",
"version": "v3"
}
] | 2015-10-23 | [
[
"Wilk",
"Grzegorz",
""
],
[
"Wlodarczyk",
"Zbigniew",
""
]
] | We provide an overview of Tsallis statistics, presented as a special case of superstatistics and applied to the multiparticle processes described by the statistical cluster model. This model combines Boltzman statistics applied to hadronization of clusters and superstatistics induced by fluctuations of their Lorentz factors. It results in a Tsallis-like distribution of transverse momenta with some scale, the origin of which is discussed. We show that this distribution becomes a Tsallis distribution in a special case, namely when one combines fluctuations of the Lorentz factor and temperature inside the cluster, given by beta and gamma distributions, respectively. |
hep-ph/9204228 | Peter Arnold | Peter Arnold | Phase Transition Temperatures at Next-to-Leading Order | 17 | Phys.Rev.D46:2628-2635,1992 | 10.1103/PhysRevD.46.2628 | null | hep-ph | null | Broken gauge symmetries are typically restored at high temperature, and the
leading-order result for the critical temperature $T_c$ was found many years
ago by Weinberg and by Dolan and Jackiw. I find a simple expression for the
next-to-leading order correction to $T_c$, which is order $e T_c$ where $e$ is
the gauge coupling. The result is a simple consequence of recent work on
summing ring diagrams at high temperature in gauge theories. The result is
valid when the Higgs self-coupling $\lambda$ is the same order as $e^2$, and it
does not address the case of strongly first-order phase transitions, which
arise when $\lambda \ll e^2$.
| [
{
"created": "Thu, 23 Apr 1992 00:17:51 GMT",
"version": "v1"
}
] | 2010-02-16 | [
[
"Arnold",
"Peter",
""
]
] | Broken gauge symmetries are typically restored at high temperature, and the leading-order result for the critical temperature $T_c$ was found many years ago by Weinberg and by Dolan and Jackiw. I find a simple expression for the next-to-leading order correction to $T_c$, which is order $e T_c$ where $e$ is the gauge coupling. The result is a simple consequence of recent work on summing ring diagrams at high temperature in gauge theories. The result is valid when the Higgs self-coupling $\lambda$ is the same order as $e^2$, and it does not address the case of strongly first-order phase transitions, which arise when $\lambda \ll e^2$. |
1307.8076 | Dirk Kr\"ucker | M. Berggren, A. Cakir, D. Kr\"ucker, J. List, A. Lobanov and I.A.
Melzer-Pellmann | Non-Simplified SUSY: stau-Coannihilation at LHC and ILC | Snowmass 2013 - 2nd version with updated signal statistics, 140
pileup background samples, improved selection cuts including topness | null | null | DESY 13-137 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Simplified models have become a widely used and important tool to cover the
more diverse phenomenology beyond constrained SUSY models. However, they come
with a substantial number of caveats themselves, and great care needs to be
taken when drawing conclusions from limits based on the simplified approach. To
illustrate this issue with a concrete example, we examine the applicability of
simplified model results to a series of full SUSY model points which all
feature a small stau-LSP mass difference, and are compatible with electroweak
and flavor precision observables as well as current LHC results. Various
channels have been studied using the Snowmass Combined LHC detector
implementation in the Delphes simulation package, as well as the Letter of
Intent or Technical Design Report simulations of the ILD detector concept at
the ILC. We investigated both the LHC and ILC capabilities for discovery,
separation and identification of all parts of the spectrum. While parts of the
spectrum would be discovered at the LHC, there is substantial room for further
discoveries and property determination at the ILC.
| [
{
"created": "Tue, 30 Jul 2013 18:26:44 GMT",
"version": "v1"
},
{
"created": "Mon, 30 Sep 2013 18:08:12 GMT",
"version": "v2"
}
] | 2013-10-01 | [
[
"Berggren",
"M.",
""
],
[
"Cakir",
"A.",
""
],
[
"Krücker",
"D.",
""
],
[
"List",
"J.",
""
],
[
"Lobanov",
"A.",
""
],
[
"Melzer-Pellmann",
"I. A.",
""
]
] | Simplified models have become a widely used and important tool to cover the more diverse phenomenology beyond constrained SUSY models. However, they come with a substantial number of caveats themselves, and great care needs to be taken when drawing conclusions from limits based on the simplified approach. To illustrate this issue with a concrete example, we examine the applicability of simplified model results to a series of full SUSY model points which all feature a small stau-LSP mass difference, and are compatible with electroweak and flavor precision observables as well as current LHC results. Various channels have been studied using the Snowmass Combined LHC detector implementation in the Delphes simulation package, as well as the Letter of Intent or Technical Design Report simulations of the ILD detector concept at the ILC. We investigated both the LHC and ILC capabilities for discovery, separation and identification of all parts of the spectrum. While parts of the spectrum would be discovered at the LHC, there is substantial room for further discoveries and property determination at the ILC. |
2212.07245 | Yuta Orikasa | Petr Bene\v{s}, Hiroshi Okada, Yuta Orikasa | Towards unification of lepton and quark mass matrices from double
covering of modular $A_4$ flavor symmetry | 9 pages, 2 figures, 3 tables. arXiv admin note: substantial text
overlap with arXiv:2206.12629, arXiv:2202.10089 | null | null | APCTP Pre2022 - 022 | hep-ph | http://creativecommons.org/licenses/by/4.0/ | We study quark and lepton masses and mixings in a double covering of modular
$A_4$ flavor symmetry in which we search for common solution of a single
modulus $\tau$, applying chi-square numerical analysis under the as minimum
framework as possible. We have found the common region of $\tau$ within
$5\sigma$ interval that is narrow in case of normal hierarchy, but not found in
case of inverted hierarchy.
| [
{
"created": "Wed, 14 Dec 2022 14:30:00 GMT",
"version": "v1"
}
] | 2022-12-15 | [
[
"Beneš",
"Petr",
""
],
[
"Okada",
"Hiroshi",
""
],
[
"Orikasa",
"Yuta",
""
]
] | We study quark and lepton masses and mixings in a double covering of modular $A_4$ flavor symmetry in which we search for common solution of a single modulus $\tau$, applying chi-square numerical analysis under the as minimum framework as possible. We have found the common region of $\tau$ within $5\sigma$ interval that is narrow in case of normal hierarchy, but not found in case of inverted hierarchy. |
hep-ph/0005079 | A. B. Balantekin | A. B. Balantekin (Wisconsin U., Madison and Max-Planck-Institute,
Heidelberg) | Unitarity Constraints on Neutrino Mass and Mixings | 6 Pages. To be published in the Proceedings of the PASCOS99
(Particles and Strings in Cosmology Workshop, 1999) | null | 10.1142/9789812792433_0067 | null | hep-ph nucl-th | null | We explore the implications of imposing the constraint that two neutrino
flavors (which for definiteness we take to be muon and tau neutrinos) are
similarly coupled to the mass basis in addition to the unitarity constraints.
Implications of this scheme for specific experimental situations are discussed.
| [
{
"created": "Tue, 9 May 2000 12:01:49 GMT",
"version": "v1"
}
] | 2016-11-03 | [
[
"Balantekin",
"A. B.",
"",
"Wisconsin U., Madison and Max-Planck-Institute,\n Heidelberg"
]
] | We explore the implications of imposing the constraint that two neutrino flavors (which for definiteness we take to be muon and tau neutrinos) are similarly coupled to the mass basis in addition to the unitarity constraints. Implications of this scheme for specific experimental situations are discussed. |
0907.0631 | Jorge Martin Camalich | L.S. Geng, J. Martin Camalich, M.J. Vicente Vacas | Electromagnetic structure of the lowest-lying decuplet resonances in
covariant chiral perturbation theory | 10 pages, 1 fig | Phys.Rev.D80:034027,2009 | 10.1103/PhysRevD.80.034027 | null | hep-ph hep-lat nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present a calculation of the leading SU(3)-breaking
$\mathcal{O}(p^3)$-corrections to the electromagnetic moments and charge radius
(CR) of the lowest-lying decuplet resonances in covariant chiral perturbation
theory. In particular, the magnetic dipole moment (MDM) of the members of the
decuplet is predicted fixing the only low-energy constant (LEC) present up to
this order with the well measured MDM of the $\Omega^-$. We predict
$\mu_\Delta^{++}=6.04(13)$ and $\mu_\Delta^+=2.84(2)$ which agree well with the
current experimental information. For the electric quadrupole moment (EQM) and
the CR we use state-of-the-art lattice QCD results to determine the
corresponding LECs, whereas for the magnetic octupole moment (MOM) there is no
unknown LEC up to the order considered here and we obtain a pure prediction. We
compare our results with those reported in large $N_c$, lattice QCD,
heavy-baryon chiral perturbation theory and other models.
| [
{
"created": "Fri, 3 Jul 2009 13:21:00 GMT",
"version": "v1"
}
] | 2009-09-01 | [
[
"Geng",
"L. S.",
""
],
[
"Camalich",
"J. Martin",
""
],
[
"Vacas",
"M. J. Vicente",
""
]
] | We present a calculation of the leading SU(3)-breaking $\mathcal{O}(p^3)$-corrections to the electromagnetic moments and charge radius (CR) of the lowest-lying decuplet resonances in covariant chiral perturbation theory. In particular, the magnetic dipole moment (MDM) of the members of the decuplet is predicted fixing the only low-energy constant (LEC) present up to this order with the well measured MDM of the $\Omega^-$. We predict $\mu_\Delta^{++}=6.04(13)$ and $\mu_\Delta^+=2.84(2)$ which agree well with the current experimental information. For the electric quadrupole moment (EQM) and the CR we use state-of-the-art lattice QCD results to determine the corresponding LECs, whereas for the magnetic octupole moment (MOM) there is no unknown LEC up to the order considered here and we obtain a pure prediction. We compare our results with those reported in large $N_c$, lattice QCD, heavy-baryon chiral perturbation theory and other models. |
2201.10628 | Shoaib Munir | Waqas Ahmed, Mark Goodsell, Shoaib Munir | Dark Matter in the CP-violating NMSSM | 26 pages, 5 figures, 2 tables. Some references added. PandaX-4T
(2021) limits included; results unchanged. Version published in EPJC | Eur. Phys. J. C82 (2022), 539 | 10.1140/epjc/s10052-022-10449-z | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In the Next-to-Minimal Supersymmetric Standard Model there is a strong
correlation between the mass terms corresponding to the singlet Higgs and the
singlino interaction states, both of which are proportional to the parameter
$\kappa$. If this parameter is complex, explicit CP-violation occurs in the
Higgs as well as the neutralino sectors of the model at the tree level, unlike
in the minimal scenario. A small magnitude of $\kappa$ typically yields a
$\cal{O}$(10) GeV lightest neutralino with a dominant singlino component. In
such a scenario, the phase of $\kappa$, beside modifying the properties of the
five Higgs bosons, can also have a crucial impact on the phenomenology of the
neutralino dark matter. In this study we perform a first investigation of this
impact on the relic abundance of the dark matter solutions with sub-100 GeV
masses, obtained for parameter space configurations of the model that are
consistent with a variety of current experimental data.
| [
{
"created": "Tue, 25 Jan 2022 21:10:59 GMT",
"version": "v1"
},
{
"created": "Sat, 18 Jun 2022 13:12:56 GMT",
"version": "v2"
}
] | 2022-06-22 | [
[
"Ahmed",
"Waqas",
""
],
[
"Goodsell",
"Mark",
""
],
[
"Munir",
"Shoaib",
""
]
] | In the Next-to-Minimal Supersymmetric Standard Model there is a strong correlation between the mass terms corresponding to the singlet Higgs and the singlino interaction states, both of which are proportional to the parameter $\kappa$. If this parameter is complex, explicit CP-violation occurs in the Higgs as well as the neutralino sectors of the model at the tree level, unlike in the minimal scenario. A small magnitude of $\kappa$ typically yields a $\cal{O}$(10) GeV lightest neutralino with a dominant singlino component. In such a scenario, the phase of $\kappa$, beside modifying the properties of the five Higgs bosons, can also have a crucial impact on the phenomenology of the neutralino dark matter. In this study we perform a first investigation of this impact on the relic abundance of the dark matter solutions with sub-100 GeV masses, obtained for parameter space configurations of the model that are consistent with a variety of current experimental data. |
hep-ph/0009164 | Grzegorz Wilk | M.Rybczynski, Z.Wlodarczyk and G.Wilk | Strangelets at Chacaltaya | gz-compressed .tar file containing LaTeX file and 4 PS files with
figures, 5 pages altogether (Nuovo Cimento cimento.cls style file attached)
Presented at Chacaltaya Meeting On Cosmic Ray Physics, La Paz - Bolivia,
23-27 July 2000. To be published in Nuovo Cimento (Proc. Suppl.) | Nuovo Cim.C24:645-650,2001 | null | null | hep-ph | null | We discuss the possible imprints of strangelets (i.e., lumps of Strange Quark
Matter) in Chacaltaya experimental data using model of propagation of such
objects through the atmosphere developed by us recently.
| [
{
"created": "Thu, 14 Sep 2000 08:54:22 GMT",
"version": "v1"
}
] | 2010-11-11 | [
[
"Rybczynski",
"M.",
""
],
[
"Wlodarczyk",
"Z.",
""
],
[
"Wilk",
"G.",
""
]
] | We discuss the possible imprints of strangelets (i.e., lumps of Strange Quark Matter) in Chacaltaya experimental data using model of propagation of such objects through the atmosphere developed by us recently. |
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