id stringlengths 9 14 | submitter stringlengths 1 56 ⌀ | authors stringlengths 5 7.68k | title stringlengths 3 299 | comments stringlengths 1 1.15k ⌀ | journal-ref stringlengths 9 298 ⌀ | doi stringlengths 12 97 ⌀ | report-no stringlengths 3 341 ⌀ | categories stringclasses 869 values | license stringclasses 9 values | orig_abstract stringlengths 16 2.44k | versions listlengths 1 39 | update_date stringlengths 10 10 | authors_parsed listlengths 1 565 | abstract stringlengths 13 2.44k |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
hep-ph/0512186 | Gregory Soyez | C. Marquet, R. Peschanski and G. Soyez | Consequences of strong fluctuations on high-energy QCD evolution | 5 pages, 1 figure, more detailed discussions added, version to appear
in Phys. Rev. D | Phys.Rev.D73:114005,2006 | 10.1103/PhysRevD.73.114005 | null | hep-ph cond-mat.stat-mech hep-th | null | We investigate the behaviour of the QCD evolution towards high-energy, in the
diffusive approximation, in the limit where the fluctuation contribution is
large. Our solution for the equivalent stochastic Fisher equation predicts the
amplitude as well as the whole set of correlators in the strong noise limit.
The speed of the front and the diffusion coefficient are obtained. We analyse
the consequences on high-energy evolution in QCD.
| [
{
"created": "Wed, 14 Dec 2005 17:38:41 GMT",
"version": "v1"
},
{
"created": "Wed, 7 Jun 2006 11:01:19 GMT",
"version": "v2"
}
] | 2008-11-26 | [
[
"Marquet",
"C.",
""
],
[
"Peschanski",
"R.",
""
],
[
"Soyez",
"G.",
""
]
] | We investigate the behaviour of the QCD evolution towards high-energy, in the diffusive approximation, in the limit where the fluctuation contribution is large. Our solution for the equivalent stochastic Fisher equation predicts the amplitude as well as the whole set of correlators in the strong noise limit. The speed of the front and the diffusion coefficient are obtained. We analyse the consequences on high-energy evolution in QCD. |
1110.3289 | Shamayita Ray | Amol Dighe (Tata Inst.), Srubabati Goswami (Ahmedabad, Phys. Res.
Lab), Shamayita Ray (Cornell U.) | Optimization of the baseline and the parent muon energy for a low energy
neutrino factory | 16 pages, 8 figures. Matches published version | Phys. Rev. D 86, 073001 (2012) | 10.1103/PhysRevD.86.073001 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We discuss the optimal setup for a low energy neutrino factory in order to
achieve a 5\sigma-discovery of a nonzero mixing angle \theta_{13}, a nonzero CP
phase \delta_{CP}, and the mass hierarchy. We explore parent muon energies in
the range 5--16 GeV, and baselines in the range 500--5000 km. We present the
results in terms of the reach in sin^2\theta_{13}, emphasizing the dependence
of the optimal baseline on the true value of \delta_{CP}. We show that the
sensitivity of a given setup typically increases with parent muon energy,
reaching saturation for higher energies. The saturation energy is larger for
longer baselines; we present an estimate of this dependence. In the light of
the recent indications of a large \theta_{13}, we also determine how these
preferences would change if indeed a large \theta_{13} is confirmed. In such a
case, the baselines ~2500 km (~1500 km) may be expected to lead to hierarchy
determination (\delta_{CP} discovery) with the minimum exposure.
| [
{
"created": "Fri, 14 Oct 2011 18:30:14 GMT",
"version": "v1"
},
{
"created": "Fri, 5 Oct 2012 16:36:45 GMT",
"version": "v2"
}
] | 2012-10-08 | [
[
"Dighe",
"Amol",
"",
"Tata Inst."
],
[
"Goswami",
"Srubabati",
"",
"Ahmedabad, Phys. Res.\n Lab"
],
[
"Ray",
"Shamayita",
"",
"Cornell U."
]
] | We discuss the optimal setup for a low energy neutrino factory in order to achieve a 5\sigma-discovery of a nonzero mixing angle \theta_{13}, a nonzero CP phase \delta_{CP}, and the mass hierarchy. We explore parent muon energies in the range 5--16 GeV, and baselines in the range 500--5000 km. We present the results in terms of the reach in sin^2\theta_{13}, emphasizing the dependence of the optimal baseline on the true value of \delta_{CP}. We show that the sensitivity of a given setup typically increases with parent muon energy, reaching saturation for higher energies. The saturation energy is larger for longer baselines; we present an estimate of this dependence. In the light of the recent indications of a large \theta_{13}, we also determine how these preferences would change if indeed a large \theta_{13} is confirmed. In such a case, the baselines ~2500 km (~1500 km) may be expected to lead to hierarchy determination (\delta_{CP} discovery) with the minimum exposure. |
hep-ph/0503172 | Abdelhak Djouadi | Abdelhak Djouadi (LPTO) | The Anatomy of Electro-Weak Symmetry Breaking. I: The Higgs boson in the
Standard Model | 339 pages, latex, many figures and tables. V2: many typos corrected,
references added and some corrected, english improved | Phys.Rept.457:1-216,2008 | 10.1016/j.physrep.2007.10.004 | LPT-Orsay-05-17 | hep-ph hep-ex | null | This review is devoted to the study of the mechanism of electroweak symmetry
breaking and this first part focuses on the Higgs particle of the Standard
Model. The fundamental properties of the Higgs boson are reviewed and its decay
modes and production mechanisms at hadron colliders and at future lepton
colliders are described in detail.
| [
{
"created": "Thu, 17 Mar 2005 16:46:33 GMT",
"version": "v1"
},
{
"created": "Tue, 3 May 2005 15:16:20 GMT",
"version": "v2"
}
] | 2009-09-29 | [
[
"Djouadi",
"Abdelhak",
"",
"LPTO"
]
] | This review is devoted to the study of the mechanism of electroweak symmetry breaking and this first part focuses on the Higgs particle of the Standard Model. The fundamental properties of the Higgs boson are reviewed and its decay modes and production mechanisms at hadron colliders and at future lepton colliders are described in detail. |
hep-ph/0112158 | Antti Sorri | Kimmo Kainulainen (NORDITA), Antti Sorri (U. of Helsinki) | Oscillation Induced Neutrino Asymmetry Growth in the Early Universe | 23 pages, 9 eps-figs, Latex, uses JHEP class | JHEP 0202 (2002) 020 | 10.1088/1126-6708/2002/02/020 | null | hep-ph astro-ph | null | We study the dynamics of active-sterile neutrino oscillations in the early
universe using full momentum-dependent quantum-kinetic equations. These
equations are too complicated to allow for an analytical treatment, and
numerical solution is greatly complicated due to very pronounced and narrow
structures in the momentum variable introduced by resonances. Here we introduce
a novel dynamical discretization of the momentum variable which overcomes this
problem. As a result we can follow the evolution of neutrino ensemble
accurately well into the stable growing phase. Our results confirm the
existence of a "chaotic region" of mixing parameters, for which the final sign
of the asymmetry, and hence the SBBN prediction of He(4)-abundance cannot be
accurately determined.
| [
{
"created": "Tue, 11 Dec 2001 16:43:43 GMT",
"version": "v1"
}
] | 2009-11-07 | [
[
"Kainulainen",
"Kimmo",
"",
"NORDITA"
],
[
"Sorri",
"Antti",
"",
"U. of Helsinki"
]
] | We study the dynamics of active-sterile neutrino oscillations in the early universe using full momentum-dependent quantum-kinetic equations. These equations are too complicated to allow for an analytical treatment, and numerical solution is greatly complicated due to very pronounced and narrow structures in the momentum variable introduced by resonances. Here we introduce a novel dynamical discretization of the momentum variable which overcomes this problem. As a result we can follow the evolution of neutrino ensemble accurately well into the stable growing phase. Our results confirm the existence of a "chaotic region" of mixing parameters, for which the final sign of the asymmetry, and hence the SBBN prediction of He(4)-abundance cannot be accurately determined. |
2303.03413 | Jack Holguin | Carlota Andres, Fabio Dominguez, Jack Holguin, Cyrille Marquet, Ian
Moult | A Coherent View of the Quark-Gluon Plasma from Energy Correlators | 26 pages, 8 lovely figures; 14 additional pages of appendices with 4
more lovely figures; v2 published in JHEP, extended introduction and small
changes in the text | null | null | null | hep-ph hep-ex hep-th nucl-ex nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The ability to measure detailed aspects of the substructure of high-energy
jets traversing the quark-gluon plasma (QGP) has provided a new window into its
internal dynamics. However, drawing robust conclusions from traditional jet
substructure observables has been difficult. In this manuscript we expand on a
new approach to jet substructure in heavy-ion collisions based on the study of
correlation functions of energy flow operators (energy correlators). We compute
the two-point energy correlator of an in-medium massless quark jet and perform
a detailed numerical analysis of the produced spectra. Our calculation
incorporates vacuum radiation resummed at next-to-leading log accuracy together
with the leading order contribution in medium-induced splittings evaluated
through the BDMPS-Z multiple scattering and GLV single scattering formalisms
for a static brick of QGP. Our analysis demonstrates how particular features of
the modifications of in-medium splittings are imprinted in the correlator
spectra, particularly showing how energy correlators may be used to extract the
onset of colour coherence. We further present a comprehensive discussion on the
accuracy and limitations of our study emphasizing how it can be systematically
improved. This work sets the foundations for a rich program studying energy
correlators in heavy-ion collisions.
| [
{
"created": "Mon, 6 Mar 2023 19:00:02 GMT",
"version": "v1"
},
{
"created": "Thu, 7 Sep 2023 13:14:15 GMT",
"version": "v2"
}
] | 2023-09-08 | [
[
"Andres",
"Carlota",
""
],
[
"Dominguez",
"Fabio",
""
],
[
"Holguin",
"Jack",
""
],
[
"Marquet",
"Cyrille",
""
],
[
"Moult",
"Ian",
""
]
] | The ability to measure detailed aspects of the substructure of high-energy jets traversing the quark-gluon plasma (QGP) has provided a new window into its internal dynamics. However, drawing robust conclusions from traditional jet substructure observables has been difficult. In this manuscript we expand on a new approach to jet substructure in heavy-ion collisions based on the study of correlation functions of energy flow operators (energy correlators). We compute the two-point energy correlator of an in-medium massless quark jet and perform a detailed numerical analysis of the produced spectra. Our calculation incorporates vacuum radiation resummed at next-to-leading log accuracy together with the leading order contribution in medium-induced splittings evaluated through the BDMPS-Z multiple scattering and GLV single scattering formalisms for a static brick of QGP. Our analysis demonstrates how particular features of the modifications of in-medium splittings are imprinted in the correlator spectra, particularly showing how energy correlators may be used to extract the onset of colour coherence. We further present a comprehensive discussion on the accuracy and limitations of our study emphasizing how it can be systematically improved. This work sets the foundations for a rich program studying energy correlators in heavy-ion collisions. |
0709.3080 | Leonid Glozman | L. Ya. Glozman and R. F. Wagenbrunn | Chirally symmetric but confining dense and cold matter | 7 pp; the paper has been expanded to make some technical details more
clear; 3 new figures have been added. To appear in PRD | Phys.Rev.D77:054027,2008 | 10.1103/PhysRevD.77.054027 | null | hep-ph astro-ph hep-th nucl-th | null | The folklore tradition about the QCD phase diagram is that at the chiral
restoration phase transition at finite density hadrons are deconfined and there
appears the quark matter. We address this question within the only known
exactly solvable confining and chirally symmetric model. It is postulated
within this model that there exists linear Coulomb-like confining interaction.
The chiral symmetry breaking and the quark Green function are obtained from the
Schwinger-Dyson (gap) equation while the color-singlet meson spectrum results
from the Bethe-Salpeter equation. We solve this model at T=0 and finite
chemical potential $\mu$ and obtain a clear chiral restoration phase transition
at the critical value \mu_{cr}. Below this value the spectrum is similar to the
previously obtained one at \mu = 0. At \mu > \mu_{cr} the quarks are still
confined and the physical spectrum consists of bound states which are arranged
into a complete set of exact chiral multiplets. This explicitly demonstrates
that a chirally symmetric matter consisting of confined but chirally symmetric
hadrons at finite chemical potential is also possible in QCD. If so, there must
be nontrivial implications for astrophysics.
| [
{
"created": "Wed, 19 Sep 2007 17:57:54 GMT",
"version": "v1"
},
{
"created": "Fri, 8 Feb 2008 12:53:51 GMT",
"version": "v2"
},
{
"created": "Tue, 4 Mar 2008 10:47:23 GMT",
"version": "v3"
}
] | 2008-11-26 | [
[
"Glozman",
"L. Ya.",
""
],
[
"Wagenbrunn",
"R. F.",
""
]
] | The folklore tradition about the QCD phase diagram is that at the chiral restoration phase transition at finite density hadrons are deconfined and there appears the quark matter. We address this question within the only known exactly solvable confining and chirally symmetric model. It is postulated within this model that there exists linear Coulomb-like confining interaction. The chiral symmetry breaking and the quark Green function are obtained from the Schwinger-Dyson (gap) equation while the color-singlet meson spectrum results from the Bethe-Salpeter equation. We solve this model at T=0 and finite chemical potential $\mu$ and obtain a clear chiral restoration phase transition at the critical value \mu_{cr}. Below this value the spectrum is similar to the previously obtained one at \mu = 0. At \mu > \mu_{cr} the quarks are still confined and the physical spectrum consists of bound states which are arranged into a complete set of exact chiral multiplets. This explicitly demonstrates that a chirally symmetric matter consisting of confined but chirally symmetric hadrons at finite chemical potential is also possible in QCD. If so, there must be nontrivial implications for astrophysics. |
hep-ph/9510316 | null | M. C. Gonzalez-Garcia (Theory Division, CERN), F. Vannucci (LPNHE,
Universit\'e Paris VII) and J. Castromonte (Universidad Peruana Cayetano
Heredia) | Stimulated Neutrino Conversion in the CERN Beam | Latex file, 9 pages, 2 postscript figures | Phys.Lett. B373 (1996) 153-158 | 10.1016/0370-2693(96)00126-8 | CERN-TH/95-262 | hep-ph hep-ex | null | We discuss the possibility of searching for anomalous magnetic transitions of
neutrinos in the CERN beam induced by the absorption or emission of low-energy
photons in a high-quality resonant cavity such as the LEP radio-frequency
cavities. With the attainable sensitivities of the present CERN neutrino
detectors, this experiment would impose strong limits on this transition and on
the radiative decay lifetime of neutrinos with masses in the range of interest
to the resolution of the dark matter solar and atmospheric neutrino puzzles.
| [
{
"created": "Tue, 17 Oct 1995 10:11:03 GMT",
"version": "v1"
}
] | 2009-10-28 | [
[
"Gonzalez-Garcia",
"M. C.",
"",
"Theory Division, CERN"
],
[
"Vannucci",
"F.",
"",
"LPNHE,\n Université Paris VII"
],
[
"Castromonte",
"J.",
"",
"Universidad Peruana Cayetano\n Heredia"
]
] | We discuss the possibility of searching for anomalous magnetic transitions of neutrinos in the CERN beam induced by the absorption or emission of low-energy photons in a high-quality resonant cavity such as the LEP radio-frequency cavities. With the attainable sensitivities of the present CERN neutrino detectors, this experiment would impose strong limits on this transition and on the radiative decay lifetime of neutrinos with masses in the range of interest to the resolution of the dark matter solar and atmospheric neutrino puzzles. |
1206.4711 | John P. Ralston | John P. Ralston | Where and How to find $susy$: The auxiliary field interpretation of
supersymmetry | null | null | null | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The {\it gauge hierarchy problem} found in perturbation theory is one of the
main attractions for supersymmetry. Yet the quantum mechanical coupling of a
low energy system to a high energy one invariably leads to {\it perturbative
instability}, which is not a valid signal of dynamical inconsistency. We show
by examples how perturbation theory with widely separated scales gives false
results. We also identify the flaw in perturbative fine-tuning arguments.
Non-perturbative features of random subsystems maintain and preserve the
hierarchy in which they are embedded. After reviewing the likelihood the
hierarchy problem is a perturbative fiction, we suggest a new interpretation of
$susy$ as practical auxiliary fields. Their function is much like Feynman's
gauge ghosts, developed in perturbation theory to repair illnesses of
perturbation theory. $susy$ will be found useful when it is considered a tool
of applied mathematics and data-fitting. We propose that $susy$ data fits
should be customized to the particular experimental situations they are suited
to improve, without dilution from the needless assumption that $susy$ must
describe universal new physics. It is likely that $susy$ will soon be
discovered a useful part of data analysis and diagnostics towards improving the
understanding of the Standard Model, and possibly towards discovering what may
constitute new physics after all.
| [
{
"created": "Wed, 20 Jun 2012 20:28:15 GMT",
"version": "v1"
}
] | 2012-06-22 | [
[
"Ralston",
"John P.",
""
]
] | The {\it gauge hierarchy problem} found in perturbation theory is one of the main attractions for supersymmetry. Yet the quantum mechanical coupling of a low energy system to a high energy one invariably leads to {\it perturbative instability}, which is not a valid signal of dynamical inconsistency. We show by examples how perturbation theory with widely separated scales gives false results. We also identify the flaw in perturbative fine-tuning arguments. Non-perturbative features of random subsystems maintain and preserve the hierarchy in which they are embedded. After reviewing the likelihood the hierarchy problem is a perturbative fiction, we suggest a new interpretation of $susy$ as practical auxiliary fields. Their function is much like Feynman's gauge ghosts, developed in perturbation theory to repair illnesses of perturbation theory. $susy$ will be found useful when it is considered a tool of applied mathematics and data-fitting. We propose that $susy$ data fits should be customized to the particular experimental situations they are suited to improve, without dilution from the needless assumption that $susy$ must describe universal new physics. It is likely that $susy$ will soon be discovered a useful part of data analysis and diagnostics towards improving the understanding of the Standard Model, and possibly towards discovering what may constitute new physics after all. |
hep-ph/0211019 | Takeo Moroi | Takeo Moroi and Hitoshi Murayama | CMB Anisotropy from Baryogenesis by a Scalar Field | 14 pages, 3 figures | Phys.Lett.B553:126-134,2003 | 10.1016/S0370-2693(02)03227-6 | TU-671, UCB-PTH-02/49, LBNL-51702 | hep-ph astro-ph | null | We study the cosmic microwave background (CMB) anisotropy in the scenario
where the baryon asymmetry of the universe is generated from a condensation of
a scalar field. In such a scenario, the scalar condensation may acquire
fluctuation during the inflation which becomes a new source of the cosmic
density perturbations. In particular, the primordial fluctuation of the scalar
condensation may induce correlated mixture of the adiabatic and isocurvature
fluctuations. If the scalar condensation decays before it completely dominates
the universe, the CMB angular power spectrum may significantly deviate from the
conventional adiabatic result. Such a deviation may be observed in the on-going
MAP experiment.
| [
{
"created": "Sat, 2 Nov 2002 04:55:21 GMT",
"version": "v1"
}
] | 2009-09-29 | [
[
"Moroi",
"Takeo",
""
],
[
"Murayama",
"Hitoshi",
""
]
] | We study the cosmic microwave background (CMB) anisotropy in the scenario where the baryon asymmetry of the universe is generated from a condensation of a scalar field. In such a scenario, the scalar condensation may acquire fluctuation during the inflation which becomes a new source of the cosmic density perturbations. In particular, the primordial fluctuation of the scalar condensation may induce correlated mixture of the adiabatic and isocurvature fluctuations. If the scalar condensation decays before it completely dominates the universe, the CMB angular power spectrum may significantly deviate from the conventional adiabatic result. Such a deviation may be observed in the on-going MAP experiment. |
1411.4665 | Kilian Nickel | Mark D. Goodsell, Kilian Nickel, Florian Staub | On the two-loop corrections to the Higgs masses in the NMSSM | 23 pages, 11 figures | Phys. Rev. D 91, 035021 (2015) | 10.1103/PhysRevD.91.035021 | Bonn-TH-2014-16, CERN-TH-2014-231 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We discuss the impact of the two-loop corrections to the Higgs mass in the
NMSSM beyond $O(\alpha_S(\alpha_b + \alpha_t))$. For this purpose we use the
combination of the public tools SARAH and SPheno to include all contributions
stemming from superpotential parameters. We show that the corrections in the
case of a heavy singlet are often MSSM-like and reduce the predicted mass of
the SM-like state by about 1 GeV as long as $\lambda$ is moderately large. For
larger values of $\lambda$ the additional corrections can increase the SM-like
Higgs mass. If a light singlet is present the additional corrections become
more important even for smaller values of $\lambda$ and can even dominate the
ones involving the strong interaction. In this context we point out that
important effects are not reproduced quantitatively when only including
$O((\alpha_b+\alpha_t+\alpha_\tau)^2)$ corrections known from the MSSM.
| [
{
"created": "Mon, 17 Nov 2014 21:11:52 GMT",
"version": "v1"
},
{
"created": "Thu, 19 Feb 2015 16:17:53 GMT",
"version": "v2"
}
] | 2015-03-05 | [
[
"Goodsell",
"Mark D.",
""
],
[
"Nickel",
"Kilian",
""
],
[
"Staub",
"Florian",
""
]
] | We discuss the impact of the two-loop corrections to the Higgs mass in the NMSSM beyond $O(\alpha_S(\alpha_b + \alpha_t))$. For this purpose we use the combination of the public tools SARAH and SPheno to include all contributions stemming from superpotential parameters. We show that the corrections in the case of a heavy singlet are often MSSM-like and reduce the predicted mass of the SM-like state by about 1 GeV as long as $\lambda$ is moderately large. For larger values of $\lambda$ the additional corrections can increase the SM-like Higgs mass. If a light singlet is present the additional corrections become more important even for smaller values of $\lambda$ and can even dominate the ones involving the strong interaction. In this context we point out that important effects are not reproduced quantitatively when only including $O((\alpha_b+\alpha_t+\alpha_\tau)^2)$ corrections known from the MSSM. |
2011.14907 | Rajeev Singh Mr. | Rajeev Singh, Gabriel Sophys and Radoslaw Ryblewski | Spin polarization dynamics in the Gubser-expanding background | 14 pages; Accepted version; Thanks to referees for nice comments;
Additional comments are very much welcome | Phys. Rev. D 103, 074024 (2021) | 10.1103/PhysRevD.103.074024 | null | hep-ph nucl-th | http://creativecommons.org/licenses/by/4.0/ | Evolution of spin polarization in the Gubser-expanding conformal
perfect-fluid hydrodynamic background is studied. The analysis of the conformal
transformation properties of the conservation laws is extended to the case of
the angular momentum conservation. The explicit forms of equations of motion
for spin components are derived and analysed, and some special solutions are
found.
| [
{
"created": "Thu, 26 Nov 2020 23:27:22 GMT",
"version": "v1"
},
{
"created": "Sun, 6 Dec 2020 21:33:58 GMT",
"version": "v2"
},
{
"created": "Mon, 22 Feb 2021 13:49:42 GMT",
"version": "v3"
},
{
"created": "Tue, 13 Apr 2021 17:51:35 GMT",
"version": "v4"
}
] | 2021-05-05 | [
[
"Singh",
"Rajeev",
""
],
[
"Sophys",
"Gabriel",
""
],
[
"Ryblewski",
"Radoslaw",
""
]
] | Evolution of spin polarization in the Gubser-expanding conformal perfect-fluid hydrodynamic background is studied. The analysis of the conformal transformation properties of the conservation laws is extended to the case of the angular momentum conservation. The explicit forms of equations of motion for spin components are derived and analysed, and some special solutions are found. |
0812.1905 | Barbara Betz | Barbara Betz, Jorge Noronha, Miklos Gyulassy, Giorgio Torrieri | Jet Energy Loss and Mach Cones in pQCD vs. AdS/CFT | 5 pages, 2 figures, proceedings of the Confinement8 Conference,
Mainz, Germany, Sept. 1-6, 2008 | PoS Confinement8:130,2008 | null | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We compare away-side hadron correlations with respect to tagged heavy quark
jets computed within a weakly coupled pQCD and a strongly coupled AdS/CFT
model. While both models feature similar far zone Mach and diffusion wakes, the
far zone stress features are shown to be too weak to survive thermal broadening
at hadron freeze-out. Observable away-side conical correlations are dominated
by the jet-induced transverse flow in near zone "Neck" region, which differs
significantly for both models. Unlike in AdS/CFT, the induced transverse flow
in the Neck zone is too weak in pQCD to produce conical correlations after
Cooper-Frye freeze-out. The observation of conical correlations violating
Mach's law would favor the strongly-coupled AdS/CFT string drag dynamics, while
their absence would favor weakly-coupled pQCD-based hydrodynamics.
| [
{
"created": "Wed, 10 Dec 2008 12:56:20 GMT",
"version": "v1"
}
] | 2009-06-25 | [
[
"Betz",
"Barbara",
""
],
[
"Noronha",
"Jorge",
""
],
[
"Gyulassy",
"Miklos",
""
],
[
"Torrieri",
"Giorgio",
""
]
] | We compare away-side hadron correlations with respect to tagged heavy quark jets computed within a weakly coupled pQCD and a strongly coupled AdS/CFT model. While both models feature similar far zone Mach and diffusion wakes, the far zone stress features are shown to be too weak to survive thermal broadening at hadron freeze-out. Observable away-side conical correlations are dominated by the jet-induced transverse flow in near zone "Neck" region, which differs significantly for both models. Unlike in AdS/CFT, the induced transverse flow in the Neck zone is too weak in pQCD to produce conical correlations after Cooper-Frye freeze-out. The observation of conical correlations violating Mach's law would favor the strongly-coupled AdS/CFT string drag dynamics, while their absence would favor weakly-coupled pQCD-based hydrodynamics. |
1809.01954 | Cesar Fernandez-Ramirez | JPAC collaboration: J.A. Silva-Castro, C. Fernandez-Ramirez, M.
Albaladejo, I.V. Danilkin, A. Jackura, V. Mathieu, J. Nys, A. Pilloni, A.P.
Szczepaniak, G. Fox | Regge phenomenology of the $N^*$ and $\Delta^*$ poles | null | Phys. Rev. D 99, 034003 (2019) | 10.1103/PhysRevD.99.034003 | JLAB-THY-18-2797 | hep-ph nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We use Regge phenomenology to study the structure of the poles of the $N^*$
and $\Delta^*$ spectrum. We employ the available pole extractions from partial
wave analysis of meson scattering and photoproduction data. We assess the
importance of the imaginary part of the poles (widths) to obtain a consistent
determination of the parameters of the Regge trajectory. We compare the several
pole extractions and show how Regge phenomenology can be used to gain insight
in the internal structure of baryons. We find that the majority of the states
in the parent Regge trajectories are compatible with a mostly compact
three-quark state picture.
| [
{
"created": "Thu, 6 Sep 2018 12:48:02 GMT",
"version": "v1"
},
{
"created": "Tue, 5 Feb 2019 16:46:32 GMT",
"version": "v2"
}
] | 2019-02-20 | [
[
"JPAC collaboration",
"",
""
],
[
"Silva-Castro",
"J. A.",
""
],
[
"Fernandez-Ramirez",
"C.",
""
],
[
"Albaladejo",
"M.",
""
],
[
"Danilkin",
"I. V.",
""
],
[
"Jackura",
"A.",
""
],
[
"Mathieu",
"V.",
""
],
[
"Nys",
"J.",
""
],
[
"Pilloni",
"A.",
""
],
[
"Szczepaniak",
"A. P.",
""
],
[
"Fox",
"G.",
""
]
] | We use Regge phenomenology to study the structure of the poles of the $N^*$ and $\Delta^*$ spectrum. We employ the available pole extractions from partial wave analysis of meson scattering and photoproduction data. We assess the importance of the imaginary part of the poles (widths) to obtain a consistent determination of the parameters of the Regge trajectory. We compare the several pole extractions and show how Regge phenomenology can be used to gain insight in the internal structure of baryons. We find that the majority of the states in the parent Regge trajectories are compatible with a mostly compact three-quark state picture. |
2001.02853 | Chih-Ting Lu | Kingman Cheung, Wai-Yee Keung, Chih-Ting Lu, and Po-Yan Tseng | Vector-like Quark Interpretation for the CKM Unitarity Violation, Excess
in Higgs Signal Strength, and Bottom Quark Forward-Backward Asymmetry | 30 pages, 3 figures, version published in JHEP | null | 10.1007/JHEP05(2020)117 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Due to a recent more precise evaluation of $V_{ud}$ and $V_{us}$, the
unitarity condition of the first row in the Cabibbo-Kobayashi-Maskawa (CKM)
matrix: $|V_{ud}|^2 + |V_{us}|^2 + |V_{ub}|^2 = 0.99798 \pm 0.00038$ now stands
at a deviation more than $4\sigma$ from unity. Furthermore, a mild excess in
the overall Higgs signal strength appears at about $2\sigma$ above the standard
model (SM) prediction, as well as the long-lasting discrepancy in the
forward-backward asymmetry ${\cal A}_{\rm FB}^b$ in $Z\to b\bar b$ at LEP.
Motivated from the above three anomalies we investigate an extension of the SM
with vector-like quarks (VLQs) associated with the down-quark sector, with the
goal of alleviating the tension among these datasets. We perform global fits of
the model under the constraints coming from the unitarity condition of the
first row of the CKM matrix, the $Z$-pole observables ${\cal A}_{\rm FB}^b$,
$R_b$ and $\Gamma_{\rm had}$, Electro-Weak precision observables $\Delta S$ and
$\Delta T$, $B$-meson observables $B_d^0$-$\overline{B}_d^0$ mixing, $B^+ \to
\pi^+ \ell^+ \ell^-$ and $B^0 \to \mu^+ \mu^-$, and direct searches for VLQs at
the Large Hadron Collider (LHC). Our results suggest that adding VLQs to the SM
provides better agreement than the SM.
| [
{
"created": "Thu, 9 Jan 2020 06:10:49 GMT",
"version": "v1"
},
{
"created": "Mon, 4 May 2020 07:00:21 GMT",
"version": "v2"
}
] | 2020-06-24 | [
[
"Cheung",
"Kingman",
""
],
[
"Keung",
"Wai-Yee",
""
],
[
"Lu",
"Chih-Ting",
""
],
[
"Tseng",
"Po-Yan",
""
]
] | Due to a recent more precise evaluation of $V_{ud}$ and $V_{us}$, the unitarity condition of the first row in the Cabibbo-Kobayashi-Maskawa (CKM) matrix: $|V_{ud}|^2 + |V_{us}|^2 + |V_{ub}|^2 = 0.99798 \pm 0.00038$ now stands at a deviation more than $4\sigma$ from unity. Furthermore, a mild excess in the overall Higgs signal strength appears at about $2\sigma$ above the standard model (SM) prediction, as well as the long-lasting discrepancy in the forward-backward asymmetry ${\cal A}_{\rm FB}^b$ in $Z\to b\bar b$ at LEP. Motivated from the above three anomalies we investigate an extension of the SM with vector-like quarks (VLQs) associated with the down-quark sector, with the goal of alleviating the tension among these datasets. We perform global fits of the model under the constraints coming from the unitarity condition of the first row of the CKM matrix, the $Z$-pole observables ${\cal A}_{\rm FB}^b$, $R_b$ and $\Gamma_{\rm had}$, Electro-Weak precision observables $\Delta S$ and $\Delta T$, $B$-meson observables $B_d^0$-$\overline{B}_d^0$ mixing, $B^+ \to \pi^+ \ell^+ \ell^-$ and $B^0 \to \mu^+ \mu^-$, and direct searches for VLQs at the Large Hadron Collider (LHC). Our results suggest that adding VLQs to the SM provides better agreement than the SM. |
1408.5616 | Daniel Pablos | J. Casalderrey-Solana, D. C. Gulhan, J. G. Milhano, D. Pablos, K.
Rajagopal | Jet quenching within a hybrid strong/weak coupling approach | 5 pages, 6 figures, Quark Matter 2014 proceedings | null | 10.1016/j.nuclphysa.2014.09.019 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We propose a novel hybrid model for jet quenching, including both strong and
weak coupling physics where each seems appropriate. Branching in the parton
shower is assumed to be perturbative and described by DGLAP evolution, while
interactions with the medium result in each parton in the shower losing energy
as at strong coupling, as realized holographically. The medium-modified parton
shower is embedded into a hydrodynamic evolution of hot QCD plasma and
confronted with LHC jet data.
| [
{
"created": "Sun, 24 Aug 2014 15:58:25 GMT",
"version": "v1"
}
] | 2015-06-22 | [
[
"Casalderrey-Solana",
"J.",
""
],
[
"Gulhan",
"D. C.",
""
],
[
"Milhano",
"J. G.",
""
],
[
"Pablos",
"D.",
""
],
[
"Rajagopal",
"K.",
""
]
] | We propose a novel hybrid model for jet quenching, including both strong and weak coupling physics where each seems appropriate. Branching in the parton shower is assumed to be perturbative and described by DGLAP evolution, while interactions with the medium result in each parton in the shower losing energy as at strong coupling, as realized holographically. The medium-modified parton shower is embedded into a hydrodynamic evolution of hot QCD plasma and confronted with LHC jet data. |
1207.5864 | Vladimir Dzuba | V. A. Dzuba, J. C. Berengut, V. V. Flambaum, and B. Roberts | Revisiting parity non-conservation in cesium | 5 pages, 4 tables | Phys. Rev. Lett. 109, 203003 (2012) | 10.1103/PhysRevLett.109.203003 | null | hep-ph physics.atom-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We apply the sum-over-states approach to calculate partial contributions to
the parity non-conservation (PNC) in cesium [Porsev {\em et al}, Phys. Rev. D
{\bf 82}, 036008 (2010)]. We have found significant corrections to two
non-dominating terms coming from the contribution of the core and highly
excited states ($n>9$, the so called {\em tail}). When these differences are
taken into account the result of Porsev {\em et al}, $E_{\rm PNC} =
0.8906\,(24) \times 10^{-11}i(-Q_W/N)$ changes to $0.8977\,(40)$, coming into
good agreement with our previous calculations, $0.8980\,(45)$. The
interpretation of the PNC measurements in cesium still indicates reasonable
agreement with the standard model ($1.5\,\sigma$), however gives new
constraints on physics beyond it.
| [
{
"created": "Wed, 25 Jul 2012 01:21:40 GMT",
"version": "v1"
}
] | 2013-05-14 | [
[
"Dzuba",
"V. A.",
""
],
[
"Berengut",
"J. C.",
""
],
[
"Flambaum",
"V. V.",
""
],
[
"Roberts",
"B.",
""
]
] | We apply the sum-over-states approach to calculate partial contributions to the parity non-conservation (PNC) in cesium [Porsev {\em et al}, Phys. Rev. D {\bf 82}, 036008 (2010)]. We have found significant corrections to two non-dominating terms coming from the contribution of the core and highly excited states ($n>9$, the so called {\em tail}). When these differences are taken into account the result of Porsev {\em et al}, $E_{\rm PNC} = 0.8906\,(24) \times 10^{-11}i(-Q_W/N)$ changes to $0.8977\,(40)$, coming into good agreement with our previous calculations, $0.8980\,(45)$. The interpretation of the PNC measurements in cesium still indicates reasonable agreement with the standard model ($1.5\,\sigma$), however gives new constraints on physics beyond it. |
1310.0193 | Urs Wiedemann A | Seyed Farid Taghavi and Urs Achim Wiedemann | The chiral magnetic wave in an expanding QCD fluid | 12 pages, 11 figures | Phys. Rev. C 91, 024902 (2015) | 10.1103/PhysRevC.91.024902 | CERN-PH-TH/2013-282 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | As a consequence of the chiral anomaly, the hydrodynamics of hot QCD matter
coupled to QED allows for a long-wavelength mode of chiral charge density, the
chiral magnetic wave (CMW), that provides for a mechanism of electric charge
separation along the direction of an external magnetic field. Here, we
investigate the efficiency of this mechanism for values of the time-dependent
magnetic field and of the energy density attained in the hot QCD matter of
ultra-relativistic heavy ion collisions. To this end, we derive the CMW
equations of motion for expanding systems by treating the CMW as a charge
perturbation on top of an expanding Bjorken-type background field in the limit
of small chemical potential. Both, approximate analytical and full numerical
solutions to these equations of motion indicate that for the lifetime and
thermodynamic conditions of ultra-relativistic heavy ion collisions, the
efficiency of CMW-induced electric charge separation decreases with increasing
center of mass energy and that the effect is numerically very small. We note,
however, that if sizable oriented asymmetries in the axial charge distribution
(that are not induced by the CMW) are present in the early fluid dynamic
evolution, then the mechanism of CMW-induced electric charge separation can be
much more efficient.
| [
{
"created": "Tue, 1 Oct 2013 09:06:31 GMT",
"version": "v1"
}
] | 2015-03-05 | [
[
"Taghavi",
"Seyed Farid",
""
],
[
"Wiedemann",
"Urs Achim",
""
]
] | As a consequence of the chiral anomaly, the hydrodynamics of hot QCD matter coupled to QED allows for a long-wavelength mode of chiral charge density, the chiral magnetic wave (CMW), that provides for a mechanism of electric charge separation along the direction of an external magnetic field. Here, we investigate the efficiency of this mechanism for values of the time-dependent magnetic field and of the energy density attained in the hot QCD matter of ultra-relativistic heavy ion collisions. To this end, we derive the CMW equations of motion for expanding systems by treating the CMW as a charge perturbation on top of an expanding Bjorken-type background field in the limit of small chemical potential. Both, approximate analytical and full numerical solutions to these equations of motion indicate that for the lifetime and thermodynamic conditions of ultra-relativistic heavy ion collisions, the efficiency of CMW-induced electric charge separation decreases with increasing center of mass energy and that the effect is numerically very small. We note, however, that if sizable oriented asymmetries in the axial charge distribution (that are not induced by the CMW) are present in the early fluid dynamic evolution, then the mechanism of CMW-induced electric charge separation can be much more efficient. |
2203.00990 | Evgeny Kryshen | Nazar Burmasov, Evgeny Kryshen, Paul Buehler, Roman Lavicka | Feasibility of tau g-2 measurements in ultra-peripheral collisions of
heavy ions | 8 pages, 6 figures, contribution to The 16th International Workshop
on Tau Lepton Physics (TAU2021) | null | null | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The anomalous magnetic moment of the tau lepton, a_tau = (g_tau - 2)/2, is a
sensitive probe of new physics but is extremely difficult to measure precisely
in contrast to electron and muon moments. The best experimental limits were set
by the DELPHI collaboration more than 15 years ago in studies of the ditau
production in the e+e -> e+e+tau+tau process. Ultra-peripheral collisions
(UPCs) of heavy ions at the LHC may provide a unique opportunity to improve the
a_tau constraints in the studies of Pb+Pb -> Pb+Pb+tau+tau process. We review
recent proposals to study ditau production via semi-leptonic tau decays in
Pb-Pb UPC with the available ATLAS and CMS data and discuss the feasibility to
explore this process down to low transverse momenta of decay leptons with the
ALICE and LHCb experiments.
| [
{
"created": "Wed, 2 Mar 2022 09:56:11 GMT",
"version": "v1"
}
] | 2022-03-03 | [
[
"Burmasov",
"Nazar",
""
],
[
"Kryshen",
"Evgeny",
""
],
[
"Buehler",
"Paul",
""
],
[
"Lavicka",
"Roman",
""
]
] | The anomalous magnetic moment of the tau lepton, a_tau = (g_tau - 2)/2, is a sensitive probe of new physics but is extremely difficult to measure precisely in contrast to electron and muon moments. The best experimental limits were set by the DELPHI collaboration more than 15 years ago in studies of the ditau production in the e+e -> e+e+tau+tau process. Ultra-peripheral collisions (UPCs) of heavy ions at the LHC may provide a unique opportunity to improve the a_tau constraints in the studies of Pb+Pb -> Pb+Pb+tau+tau process. We review recent proposals to study ditau production via semi-leptonic tau decays in Pb-Pb UPC with the available ATLAS and CMS data and discuss the feasibility to explore this process down to low transverse momenta of decay leptons with the ALICE and LHCb experiments. |
hep-ph/0208219 | John F. Gunion | D. Asner (LLNL), B. Grzadkowski (Warsaw), J.F. Gunion (U.C. Davis),
H.E. Logan (FNAL), V. Martin (NWU), M. Schmitt (NWU), M.M. Velasco (NWU) | New results for a photon-photon collider | 17 pages, 15 figures | null | null | UCD-02-11 | hep-ph | null | We present new results from studies in progress on physics at a two-photon
collider. We report on the sensitivity to top squark parameters of MSSM Higgs
boson production in two-photon collisions; Higgs boson decay to two photons;
radion production in models of warped extra dimensions; chargino pair
production; sensitivity to the trilinear Higgs boson coupling; charged Higgs
boson pair production; and we discuss the backgrounds produced by resolved
photon-photon interactions.
| [
{
"created": "Sat, 24 Aug 2002 08:32:30 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Asner",
"D.",
"",
"LLNL"
],
[
"Grzadkowski",
"B.",
"",
"Warsaw"
],
[
"Gunion",
"J. F.",
"",
"U.C. Davis"
],
[
"Logan",
"H. E.",
"",
"FNAL"
],
[
"Martin",
"V.",
"",
"NWU"
],
[
"Schmitt",
"M.",
"",
"NWU"
],
[
"Velasco",
"M. M.",
"",
"NWU"
]
] | We present new results from studies in progress on physics at a two-photon collider. We report on the sensitivity to top squark parameters of MSSM Higgs boson production in two-photon collisions; Higgs boson decay to two photons; radion production in models of warped extra dimensions; chargino pair production; sensitivity to the trilinear Higgs boson coupling; charged Higgs boson pair production; and we discuss the backgrounds produced by resolved photon-photon interactions. |
2305.03015 | Henning Bahl | Henning Bahl, Johannes Braathen, Martin Gabelmann, Georg Weiglein | anyH3: precise predictions for the trilinear Higgs coupling in the
Standard Model and beyond | 77 pages, 16 figures, https://gitlab.com/anybsm; v2: matches
published version | null | null | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The trilinear Higgs coupling $\lambda_{hhh}$ of the detected Higgs boson is
an important probe for physics beyond the Standard Model. Correspondingly,
improving the precision of the theoretical predictions for this coupling as
well as the experimental constraints on it are among the main goals of particle
physics in the near future. In this article, we present the public
$\mathtt{Python}$ code $\mathtt{anyH3}$, which provides precise theoretical
predictions for $\lambda_{hhh}$. The program can easily be used for any
renormalisable model, where for the input the $\mathtt{UFO}$ format is adopted.
It allows including corrections up to the full one-loop level with arbitrary
values of the external squared momenta and features a semi-automatic and highly
flexible renormalisation procedure. The code is validated against known results
in the literature. Moreover, we present new results for $\lambda_{hhh}$ in
models which so far have not been investigated in the literature.
| [
{
"created": "Thu, 4 May 2023 17:40:48 GMT",
"version": "v1"
},
{
"created": "Mon, 17 Jun 2024 06:56:47 GMT",
"version": "v2"
},
{
"created": "Wed, 26 Jun 2024 13:54:05 GMT",
"version": "v3"
}
] | 2024-06-27 | [
[
"Bahl",
"Henning",
""
],
[
"Braathen",
"Johannes",
""
],
[
"Gabelmann",
"Martin",
""
],
[
"Weiglein",
"Georg",
""
]
] | The trilinear Higgs coupling $\lambda_{hhh}$ of the detected Higgs boson is an important probe for physics beyond the Standard Model. Correspondingly, improving the precision of the theoretical predictions for this coupling as well as the experimental constraints on it are among the main goals of particle physics in the near future. In this article, we present the public $\mathtt{Python}$ code $\mathtt{anyH3}$, which provides precise theoretical predictions for $\lambda_{hhh}$. The program can easily be used for any renormalisable model, where for the input the $\mathtt{UFO}$ format is adopted. It allows including corrections up to the full one-loop level with arbitrary values of the external squared momenta and features a semi-automatic and highly flexible renormalisation procedure. The code is validated against known results in the literature. Moreover, we present new results for $\lambda_{hhh}$ in models which so far have not been investigated in the literature. |
2310.13823 | Howard Georgi | Howard Georgi | Gauge Boson Mass Dependence and Chiral Anomalies in Generalized Massless
Schwinger models | 13 pages, 0 figures | null | null | null | hep-ph hep-th | http://creativecommons.org/licenses/by/4.0/ | I bosonize the position-space correlators of flavor-diagonal scalar fermion
bilinears in arbitrary generalizations of the Schwinger model with $n_F$
massless fermions coupled to $n_A$ gauge bosons for $n_F\geq n_A$. For
$n_A=n_F$, the fermion bilinears can be bosonized in terms of $n_F$ scalars
with masses proportional to the gauge couplings. As in the Schwinger model,
bosonization can be used to find all correlators, including those that are
forbidden in perturbation theory by anomalous chiral symmetries, but there are
subtleties when there is more than one gauge boson. The new result here is the
general treatment of the dependence on gauge boson masses in models with more
than one gauge symmetry. For $n_A<n_F$, there are fermion bilinears with
nontrivial anomalous dimensions and there are unbroken chiral symmetries so
some correlators vanish while others are non-zero due to chiral anomlies.
Taking careful account of the dependence on the masses, I show how the
$n_A<n_F$ models emerge from $n_A=n_F$ as gauge couplings (and thus gauge boson
masses) go to zero. When this is done properly, the limit of zero gauge
coupling is smooth. Our consistent treatment of gauge boson masses guarantees
that anomalous symmetries are broken while unbroken chiral symmetries are
preserved because correlators that break the non-anomalous symmetries go to
zero in the limit of zero gauge coupling.
| [
{
"created": "Fri, 20 Oct 2023 21:26:42 GMT",
"version": "v1"
},
{
"created": "Sat, 6 Jan 2024 14:52:53 GMT",
"version": "v2"
}
] | 2024-01-09 | [
[
"Georgi",
"Howard",
""
]
] | I bosonize the position-space correlators of flavor-diagonal scalar fermion bilinears in arbitrary generalizations of the Schwinger model with $n_F$ massless fermions coupled to $n_A$ gauge bosons for $n_F\geq n_A$. For $n_A=n_F$, the fermion bilinears can be bosonized in terms of $n_F$ scalars with masses proportional to the gauge couplings. As in the Schwinger model, bosonization can be used to find all correlators, including those that are forbidden in perturbation theory by anomalous chiral symmetries, but there are subtleties when there is more than one gauge boson. The new result here is the general treatment of the dependence on gauge boson masses in models with more than one gauge symmetry. For $n_A<n_F$, there are fermion bilinears with nontrivial anomalous dimensions and there are unbroken chiral symmetries so some correlators vanish while others are non-zero due to chiral anomlies. Taking careful account of the dependence on the masses, I show how the $n_A<n_F$ models emerge from $n_A=n_F$ as gauge couplings (and thus gauge boson masses) go to zero. When this is done properly, the limit of zero gauge coupling is smooth. Our consistent treatment of gauge boson masses guarantees that anomalous symmetries are broken while unbroken chiral symmetries are preserved because correlators that break the non-anomalous symmetries go to zero in the limit of zero gauge coupling. |
0801.3558 | Pere Masjuan | P. Masjuan and S. Peris (IFAE-Uab) | A rational approximation to <VV-AA> and its O(p^6) low-energy constant | 10 pages, 1 figure. Comments and references added. Journal version | Phys.Lett.B663:61-65,2008 | 10.1016/j.physletb.2008.03.040 | null | hep-ph hep-lat | null | Using a sequence of rational approximants and the large-Nc limit of QCD, we
estimate the value of the low-energy constant C_87 which appears in the
Lagrangian of Chiral Perturbation Theory at O(p^6).
| [
{
"created": "Wed, 23 Jan 2008 17:47:54 GMT",
"version": "v1"
},
{
"created": "Wed, 26 Mar 2008 09:43:09 GMT",
"version": "v2"
}
] | 2008-11-26 | [
[
"Masjuan",
"P.",
"",
"IFAE-Uab"
],
[
"Peris",
"S.",
"",
"IFAE-Uab"
]
] | Using a sequence of rational approximants and the large-Nc limit of QCD, we estimate the value of the low-energy constant C_87 which appears in the Lagrangian of Chiral Perturbation Theory at O(p^6). |
1002.4705 | Tetsuro Yamaoka | Masayasu Harada, Chiho Nonaka, Tetsuro Yamaoka (Nagoya University) | Masses of vector bosons in two-color dense QCD based on the hidden local
symmetry | 24 pages, 5 figures | Phys.Rev.D81:096003,2010 | 10.1103/PhysRevD.81.096003 | null | hep-ph hep-lat | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We construct a low energy effective Lagrangian for the two-color QCD
including the "vector" bosons (mesons with J^P=1^- and diquark baryons with
J^P=1^+) in addition to the pseudo Nambu-Goldstone bosons with a degenerate
mass M_\pi (mesons with J^P=0^- and baryons with J^P=0^+) based on the chiral
symmetry breaking pattern of SU(2N_f) \to Sp(2N_f) in the framework of the
hidden local symmetry. We investigate the dependence of the "vector" boson
masses on the baryon number density \mu_B. We show that the \mu_B-dependence
signals the phase transition of U(1)_B breaking. We find that it gives
information about mixing among "vector" bosons: e.g. the mass difference
between \rho and \omega mesons is proportional to the mixing strength between
the diquark baryon with J^P=1^+ and the anti-baryon. We discuss the comparison
with lattice data for two-color QCD at finite density.
| [
{
"created": "Thu, 25 Feb 2010 07:54:22 GMT",
"version": "v1"
}
] | 2014-11-20 | [
[
"Harada",
"Masayasu",
"",
"Nagoya University"
],
[
"Nonaka",
"Chiho",
"",
"Nagoya University"
],
[
"Yamaoka",
"Tetsuro",
"",
"Nagoya University"
]
] | We construct a low energy effective Lagrangian for the two-color QCD including the "vector" bosons (mesons with J^P=1^- and diquark baryons with J^P=1^+) in addition to the pseudo Nambu-Goldstone bosons with a degenerate mass M_\pi (mesons with J^P=0^- and baryons with J^P=0^+) based on the chiral symmetry breaking pattern of SU(2N_f) \to Sp(2N_f) in the framework of the hidden local symmetry. We investigate the dependence of the "vector" boson masses on the baryon number density \mu_B. We show that the \mu_B-dependence signals the phase transition of U(1)_B breaking. We find that it gives information about mixing among "vector" bosons: e.g. the mass difference between \rho and \omega mesons is proportional to the mixing strength between the diquark baryon with J^P=1^+ and the anti-baryon. We discuss the comparison with lattice data for two-color QCD at finite density. |
hep-ph/9610230 | Stefano Bertolini | V. Antonelli, S. Bertolini, M. Fabbrichesi and E.I. Lashin | The Physics of $K^0 -\bar K^0$ Mixing: $\widehat{B}_K$ and $\Delta
M_{LS}$ in the Chiral Quark Model | 31 pages, Latex file including 7 eps figures. Revised version to
appear in Nucl. Phys. B | Nucl.Phys.B493:281-304,1997 | 10.1016/S0550-3213(97)00146-6 | SISSA 20/96/EP | hep-ph | null | We compute the $\widehat B_K$ parameter and the mass difference $\Delta
M_{LS}$ of the $K^0-\bar K^0$ system by means of the chiral quark model. The
chiral coefficients of the relevant $\Delta S=2$ and $\Delta S=1$ chiral
lagrangians are computed via quark-loop integration. We include the relevant
effects of one-loop corrections in chiral perturbation theory. The final result
is very sensitive to non-factorizable corrections of $O(\alpha_S N)$ coming
from gluon condensation. The size of the gluon condensate is determined by
fitting the experimental value of the amplitude $K^+ \to \pi^+\pi^0$. By
varying all the relevant parameters we obtain $\widehat{B}_K= 0.87 \pm 0.33\ .$
We evaluate within the model the long-distance contributions to $\Delta M_{LS}$
induced by the double insertion of the $\Delta S = 1$ chiral lagrangian and
study the interplay between short- and long-distance amplitudes. By varying all
parameters we obtain $\Delta M_{LS}^{th}/\Delta M_{LS}^{exp} = 0.76
^{+0.64}_{-0.34} .$ Finally, we investigate the phenomenological constraints on
the Kobayashi-Maskawa parameter Im $\lambda _t$ entering the determination of
$\epsilon'/\epsilon$.
| [
{
"created": "Thu, 3 Oct 1996 08:41:32 GMT",
"version": "v1"
},
{
"created": "Mon, 24 Feb 1997 11:17:54 GMT",
"version": "v2"
}
] | 2014-11-17 | [
[
"Antonelli",
"V.",
""
],
[
"Bertolini",
"S.",
""
],
[
"Fabbrichesi",
"M.",
""
],
[
"Lashin",
"E. I.",
""
]
] | We compute the $\widehat B_K$ parameter and the mass difference $\Delta M_{LS}$ of the $K^0-\bar K^0$ system by means of the chiral quark model. The chiral coefficients of the relevant $\Delta S=2$ and $\Delta S=1$ chiral lagrangians are computed via quark-loop integration. We include the relevant effects of one-loop corrections in chiral perturbation theory. The final result is very sensitive to non-factorizable corrections of $O(\alpha_S N)$ coming from gluon condensation. The size of the gluon condensate is determined by fitting the experimental value of the amplitude $K^+ \to \pi^+\pi^0$. By varying all the relevant parameters we obtain $\widehat{B}_K= 0.87 \pm 0.33\ .$ We evaluate within the model the long-distance contributions to $\Delta M_{LS}$ induced by the double insertion of the $\Delta S = 1$ chiral lagrangian and study the interplay between short- and long-distance amplitudes. By varying all parameters we obtain $\Delta M_{LS}^{th}/\Delta M_{LS}^{exp} = 0.76 ^{+0.64}_{-0.34} .$ Finally, we investigate the phenomenological constraints on the Kobayashi-Maskawa parameter Im $\lambda _t$ entering the determination of $\epsilon'/\epsilon$. |
2302.10117 | Niels-Uwe Bastian | Niels-Uwe Friedrich Bastian, Pasi Huovinen, Elizaveta Nazarova | Implementation of Cluster expansion for hot QCD matter | null | null | 10.1016/j.nuclphysa.2023.122718 | null | hep-ph nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present a cluster expansion EoS model for strongly-interacting matter
based on the generalized Beth-Uhlenbeck formalism to describe hadrons as bound
clusters of quarks. This formalism can describe both confined and deconfined
phases. Our emphasis is on the region of vanishing baryon densities, where
numerical solutions available from Lattice QCD predict a smooth crossover
transition from hadron to quark matter. Medium effects are taken into account
as self energies, which are motivated from both perturbative QCD calculations
and phenomenological models. Parameters are tuned to Lattice QCD data and
result in a good agreement of the thermodynamics.
| [
{
"created": "Mon, 20 Feb 2023 17:24:48 GMT",
"version": "v1"
}
] | 2023-08-09 | [
[
"Bastian",
"Niels-Uwe Friedrich",
""
],
[
"Huovinen",
"Pasi",
""
],
[
"Nazarova",
"Elizaveta",
""
]
] | We present a cluster expansion EoS model for strongly-interacting matter based on the generalized Beth-Uhlenbeck formalism to describe hadrons as bound clusters of quarks. This formalism can describe both confined and deconfined phases. Our emphasis is on the region of vanishing baryon densities, where numerical solutions available from Lattice QCD predict a smooth crossover transition from hadron to quark matter. Medium effects are taken into account as self energies, which are motivated from both perturbative QCD calculations and phenomenological models. Parameters are tuned to Lattice QCD data and result in a good agreement of the thermodynamics. |
2404.18653 | Mauricio A. Diaz | Mauricio A. Diaz, Giorgio Cerro, Srinandan Dasmahapatra, Stefano
Moretti | Bayesian Active Search on Parameter Space: a 95 GeV Spin-0 Resonance in
the ($B-L$)SSM | null | null | null | null | hep-ph | http://creativecommons.org/licenses/by/4.0/ | In the attempt to explain possible data anomalies from collider experiments
in terms of New Physics (NP) models, computationally expensive scans over their
parameter spaces are typically required in order to match theoretical
predictions to experimental observations. Under the assumption that anomalies
seen at a mass of about 95 GeV by the Large Electron-Positron (LEP) and Large
Hadron Collider (LHC) experiments correspond to a NP signal, which we attempt
to interpret as a spin-0 resonance in the $(B-L)$ Supersymmetric Standard Model
($(B-L)$SSM), chosen as an illustrative example, we introduce a novel Machine
Learning (ML) approach based on a multi-objective active search method, called
b-CASTOR, able to achieve high sample efficiency and diversity, due to the use
of probabilistic surrogate models and a volume based search policy,
outperforming competing algorithms, such as those based on Markov-Chain Monte
Carlo (MCMC) methods.
| [
{
"created": "Mon, 29 Apr 2024 12:34:47 GMT",
"version": "v1"
}
] | 2024-04-30 | [
[
"Diaz",
"Mauricio A.",
""
],
[
"Cerro",
"Giorgio",
""
],
[
"Dasmahapatra",
"Srinandan",
""
],
[
"Moretti",
"Stefano",
""
]
] | In the attempt to explain possible data anomalies from collider experiments in terms of New Physics (NP) models, computationally expensive scans over their parameter spaces are typically required in order to match theoretical predictions to experimental observations. Under the assumption that anomalies seen at a mass of about 95 GeV by the Large Electron-Positron (LEP) and Large Hadron Collider (LHC) experiments correspond to a NP signal, which we attempt to interpret as a spin-0 resonance in the $(B-L)$ Supersymmetric Standard Model ($(B-L)$SSM), chosen as an illustrative example, we introduce a novel Machine Learning (ML) approach based on a multi-objective active search method, called b-CASTOR, able to achieve high sample efficiency and diversity, due to the use of probabilistic surrogate models and a volume based search policy, outperforming competing algorithms, such as those based on Markov-Chain Monte Carlo (MCMC) methods. |
hep-ph/0002301 | Carsten Merten | Carsten Merten (University of Wuppertal, Germany) | Nucleon Decay and Neutrino Properties in a Mass Model based on an SO(10)
Grand Unified Theory | PhD thesis (in german), 125 pages with 11 figures | null | null | WUB-DIS 99-14 | hep-ph | null | In this work a mass model based on a SO(10) GUT with a global U(1) family
symmetry is discussed which leads to an asymmetric Nearest Neighbour
Interaction structure for the fermionic mass matrices. As a result of the
analysis one gets three solutions of the model which include several large
left- and right-handed fermion mixings. Those mixings are not observable in the
SM where only the CKM quark mixing matrix can be measured, but they have
testable effects on the branching ratios of nucleon decays in theories beyond
the SM. One finds that decay channels with positrons in the final state are
suppressed while channels with antimuons and antineutrinos are enhanced
compared to models with small mixings. The total nucleon lifetimes obtained
should be observable by future experiments. The SO(10) model also predicts the
masses and mixings of the light neutrinos. They are in the right range to
explain the anomalies of solar and atmospheric neutrinos by means of
oscillations, preferring the small angle MSW solution for the solar neutrino
deficit.
| [
{
"created": "Tue, 29 Feb 2000 15:50:59 GMT",
"version": "v1"
},
{
"created": "Thu, 2 Mar 2000 10:59:38 GMT",
"version": "v2"
}
] | 2009-09-25 | [
[
"Merten",
"Carsten",
"",
"University of Wuppertal, Germany"
]
] | In this work a mass model based on a SO(10) GUT with a global U(1) family symmetry is discussed which leads to an asymmetric Nearest Neighbour Interaction structure for the fermionic mass matrices. As a result of the analysis one gets three solutions of the model which include several large left- and right-handed fermion mixings. Those mixings are not observable in the SM where only the CKM quark mixing matrix can be measured, but they have testable effects on the branching ratios of nucleon decays in theories beyond the SM. One finds that decay channels with positrons in the final state are suppressed while channels with antimuons and antineutrinos are enhanced compared to models with small mixings. The total nucleon lifetimes obtained should be observable by future experiments. The SO(10) model also predicts the masses and mixings of the light neutrinos. They are in the right range to explain the anomalies of solar and atmospheric neutrinos by means of oscillations, preferring the small angle MSW solution for the solar neutrino deficit. |
2211.06686 | Jin Min Yang | Jin Min Yang, Pengxuan Zhu, Rui Zhu | A brief survey of low energy supersymmetry under current experiments | Proceedings of the LHCP 2022 conference | PoS(LHCP2022)069 | null | null | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | This is a brief overview on the low energy supersymmetry in light of current
experiments including the LHC searches, the dark matter (DM) detections, the
muon g-2 and the CDF II measurement of the W-boson mass. We focus on the
minimal framework of supersymmetry, namely the minimal supersymmetric model
(MSSM), and obtain the following conclusions: (i) The MSSM can survive all
current experiments, albeit suffering from the little hierarchy problem due to
the heavy stops pushed up by the LHC searches; (ii) The DM relic density can be
readily achieved by the thermal freeze-out of the lightest neutralino and the
null results of DM direct detections are typically driving the parameter space
to the bino-like lightest neutralino region; (iii) The muon g-2 anomaly
reported by FNAL and BNL can be explained at 2-sigma level, which indicates
light sleptons and electroweakinos possibly accessible at the HL-LHC; (iv) The
CDF II measurement of the W-boson mass can be marginally explained, but
requires light stops near TeV which may soon be covered by the LHC searches.
| [
{
"created": "Sat, 12 Nov 2022 15:22:12 GMT",
"version": "v1"
}
] | 2022-11-15 | [
[
"Yang",
"Jin Min",
""
],
[
"Zhu",
"Pengxuan",
""
],
[
"Zhu",
"Rui",
""
]
] | This is a brief overview on the low energy supersymmetry in light of current experiments including the LHC searches, the dark matter (DM) detections, the muon g-2 and the CDF II measurement of the W-boson mass. We focus on the minimal framework of supersymmetry, namely the minimal supersymmetric model (MSSM), and obtain the following conclusions: (i) The MSSM can survive all current experiments, albeit suffering from the little hierarchy problem due to the heavy stops pushed up by the LHC searches; (ii) The DM relic density can be readily achieved by the thermal freeze-out of the lightest neutralino and the null results of DM direct detections are typically driving the parameter space to the bino-like lightest neutralino region; (iii) The muon g-2 anomaly reported by FNAL and BNL can be explained at 2-sigma level, which indicates light sleptons and electroweakinos possibly accessible at the HL-LHC; (iv) The CDF II measurement of the W-boson mass can be marginally explained, but requires light stops near TeV which may soon be covered by the LHC searches. |
1801.08625 | Hai-Yang Cheng | Hai-Yang Cheng, Xian-Wei Kang, Fanrong Xu | Singly Cabibbo-suppressed hadronic decays of $\Lambda_c^+$ | 22 pages, 1 figure; a typo in Table II corrected, references added,
to appear in PRD | Phys. Rev. D 97, 074028 (2018) | 10.1103/PhysRevD.97.074028 | null | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study singly Cabibbo-suppressed two-body hadronic decays of the charmed
baryon $\Lambda_c^+$, namely, $\Lambda_c^+\to \Lambda K^+, p\pi^0, p\eta,
n\pi^+,\Sigma^0K^+,\Sigma^+ K^0$. We use the measured rate of $\Lambda_c^+\to
p\phi$ to fix the effective Wilson coefficient $a_2$ for naive color-suppressed
modes and the effective number of color $N_c^{\rm eff}$. We rely on the
current-algebra approach to evaluate $W$-exchange and nonfactorizable internal
$W$-emission amplitudes, that is, the commutator terms for the $S$-wave and the
pole terms for the $P$-wave. Our prediction for $\Lambda_c^+\to p\eta$ is in
excellent agreement with the BESIII measurement. The $p\eta$ ($p\pi^0$) mode
has a large (small) rate because of a large constructive (destructive)
interference between the factorizable and nonfactorizable amplitudes for both
$S$- and $P$-waves. Some of the SU(3) relations such as $M(\Lambda_c^+\to
n\pi^+)=\sqrt{2}M(\Lambda_c^+\to p\pi^0)$ derived under the assumption of
sextet dominance are not valid for decays with factorizable terms. Our
calculation indicates that the branching fraction of $\Lambda_c^+\to n\pi^+$ is
about 3.5 times larger than that of $\Lambda_c^+\to p\pi^0$. Decay asymmetries
are found to be negative for all singly Cabibbo-suppressed modes and range from
$-0.56$ to $-0.96$.
| [
{
"created": "Thu, 25 Jan 2018 22:38:29 GMT",
"version": "v1"
},
{
"created": "Fri, 30 Mar 2018 04:56:16 GMT",
"version": "v2"
}
] | 2018-05-09 | [
[
"Cheng",
"Hai-Yang",
""
],
[
"Kang",
"Xian-Wei",
""
],
[
"Xu",
"Fanrong",
""
]
] | We study singly Cabibbo-suppressed two-body hadronic decays of the charmed baryon $\Lambda_c^+$, namely, $\Lambda_c^+\to \Lambda K^+, p\pi^0, p\eta, n\pi^+,\Sigma^0K^+,\Sigma^+ K^0$. We use the measured rate of $\Lambda_c^+\to p\phi$ to fix the effective Wilson coefficient $a_2$ for naive color-suppressed modes and the effective number of color $N_c^{\rm eff}$. We rely on the current-algebra approach to evaluate $W$-exchange and nonfactorizable internal $W$-emission amplitudes, that is, the commutator terms for the $S$-wave and the pole terms for the $P$-wave. Our prediction for $\Lambda_c^+\to p\eta$ is in excellent agreement with the BESIII measurement. The $p\eta$ ($p\pi^0$) mode has a large (small) rate because of a large constructive (destructive) interference between the factorizable and nonfactorizable amplitudes for both $S$- and $P$-waves. Some of the SU(3) relations such as $M(\Lambda_c^+\to n\pi^+)=\sqrt{2}M(\Lambda_c^+\to p\pi^0)$ derived under the assumption of sextet dominance are not valid for decays with factorizable terms. Our calculation indicates that the branching fraction of $\Lambda_c^+\to n\pi^+$ is about 3.5 times larger than that of $\Lambda_c^+\to p\pi^0$. Decay asymmetries are found to be negative for all singly Cabibbo-suppressed modes and range from $-0.56$ to $-0.96$. |
hep-ph/0211241 | Okun Lev Borisovich | L.B. Okun, M.G. Schepkin, I.S. Tsukerman | On the extra factor of two in the phase of neutrino oscillations | 5 pages, two sentences at the end of the paper are deleted and two
are added | Nucl.Phys. B650 (2003) 443-446; Erratum-ibid. B656 (2003) 255 | 10.1016/S0550-3213(02)01037-4 | null | hep-ph | null | Attempts to modify the standard expression for the phase in neutrino
oscillations by an extra factor of two are based on misuse of quantum
mechanics. Claims to present Bruno Pontecorvo and his coauthors as
``godfathers'' of this ``extra 2'' factor are easily disproved by unbiased
reading their articles.
| [
{
"created": "Fri, 15 Nov 2002 09:02:39 GMT",
"version": "v1"
},
{
"created": "Tue, 11 Feb 2003 15:39:10 GMT",
"version": "v2"
}
] | 2009-11-07 | [
[
"Okun",
"L. B.",
""
],
[
"Schepkin",
"M. G.",
""
],
[
"Tsukerman",
"I. S.",
""
]
] | Attempts to modify the standard expression for the phase in neutrino oscillations by an extra factor of two are based on misuse of quantum mechanics. Claims to present Bruno Pontecorvo and his coauthors as ``godfathers'' of this ``extra 2'' factor are easily disproved by unbiased reading their articles. |
hep-ph/0012217 | Zhaohua Xiong | Z. Xiong, J.-M. Yang (Institute of Theoretical Physics, Academia
Sinica) | Rare decays $B\to X_s\tau^+\tau^-$ and $B_s\to \tau^+\tau^-\gamma$ in
technicolor with scalars | NPB version. 15 pages, 6 figures | Nucl.Phys. B602 (2001) 289-306 | 10.1016/S0550-3213(01)00092-X | null | hep-ph | null | We examine the rare decays $B\to X_s\tau^+\tau^-$ and $B_s\to\tau^+\tau^-
\gamma$ in the framework of technicolor with scalars. The contributions from
both the neutral and charged scalars predicted in this model are evaluated. We
find that the branching ratios could be enhanced over the standard model
predictions by a couple of orders of magnitude in some part of parameter space.
The forward-backward asymmetry and the distributions of differential branching
ratios are also found to differ significantly from the standard model results.
Such large new physics effects might be observable in the new generation of B
experiments.
| [
{
"created": "Mon, 18 Dec 2000 09:28:53 GMT",
"version": "v1"
},
{
"created": "Fri, 13 Apr 2001 01:13:27 GMT",
"version": "v2"
}
] | 2009-10-31 | [
[
"Xiong",
"Z.",
"",
"Institute of Theoretical Physics, Academia\n Sinica"
],
[
"Yang",
"J. -M.",
"",
"Institute of Theoretical Physics, Academia\n Sinica"
]
] | We examine the rare decays $B\to X_s\tau^+\tau^-$ and $B_s\to\tau^+\tau^- \gamma$ in the framework of technicolor with scalars. The contributions from both the neutral and charged scalars predicted in this model are evaluated. We find that the branching ratios could be enhanced over the standard model predictions by a couple of orders of magnitude in some part of parameter space. The forward-backward asymmetry and the distributions of differential branching ratios are also found to differ significantly from the standard model results. Such large new physics effects might be observable in the new generation of B experiments. |
2109.00112 | Thomas A. Trainor | Thomas A. Trainor | Fluctuations and Selection Bias in 5 and 13 TeV p-p Collisions: Where
are the jets? | 5 pages, 6 figures | null | null | null | hep-ph hep-ex | http://creativecommons.org/licenses/by/4.0/ | The ALICE collaboration recently reported high-statistics $\bf p_t$ spectra
from 5 TeV and 13 TeV p-p collisions with intent to determine the role of jets
in high-multiplicity collisions. In the present study a two-component (soft +
hard) model (TCM) of hadron production in p-p collisions is applied to ALICE
$\bf p_t$ spectra. As in previous TCM studies of A-B collision systems jet and
nonjet contributions to $\bf p_t$ spectra are accurately separated over the
entire $\bf p_t$ acceptance. The statistical significance of data-model
differences is established leading to insights concerning selection bias and
spectrum model validity.
| [
{
"created": "Tue, 31 Aug 2021 23:26:51 GMT",
"version": "v1"
}
] | 2021-09-02 | [
[
"Trainor",
"Thomas A.",
""
]
] | The ALICE collaboration recently reported high-statistics $\bf p_t$ spectra from 5 TeV and 13 TeV p-p collisions with intent to determine the role of jets in high-multiplicity collisions. In the present study a two-component (soft + hard) model (TCM) of hadron production in p-p collisions is applied to ALICE $\bf p_t$ spectra. As in previous TCM studies of A-B collision systems jet and nonjet contributions to $\bf p_t$ spectra are accurately separated over the entire $\bf p_t$ acceptance. The statistical significance of data-model differences is established leading to insights concerning selection bias and spectrum model validity. |
hep-ph/9707338 | Mike Seymour | Michael H. Seymour (RAL) | Jet Shapes in Hadron Collisions: Higher Orders, Resummation and
Hadronization | Replaced version adds several references, corrects a mistake in the
description of CDF's jet algorithm and several minor inconsistencies. No
results are affected. 34 pages, 29 figures. This paper can also be obtained
from http://surya11.cern.ch/users/seymour/pubs/profile.ps.gz | Nucl.Phys. B513 (1998) 269-300 | 10.1016/S0550-3213(97)00711-6 | RAL-97-026 | hep-ph | null | The jet shape is a simple measure of how widely a jet's energy is spread. At
present jet shape distributions have only been calculated to leading order in
perturbative QCD. In this paper we consider how much these predictions should
be affected by higher order perturbative corrections, by resummation of
enhanced corrections to all orders, and by (power-suppressed) non-perturbative
corrections. We also show that current cone-type jet definitions are not
infrared safe for final states with more than three partons. Unless this
situation is rectified by using improved definitions, hadron collider
experiments will never be able to study the internal properties of jets with
the quantitative accuracy already achieved in $e^+e^-$ annihilation.
| [
{
"created": "Mon, 14 Jul 1997 18:52:53 GMT",
"version": "v1"
},
{
"created": "Thu, 17 Jul 1997 13:41:48 GMT",
"version": "v2"
},
{
"created": "Sat, 2 Aug 1997 15:48:39 GMT",
"version": "v3"
}
] | 2009-10-30 | [
[
"Seymour",
"Michael H.",
"",
"RAL"
]
] | The jet shape is a simple measure of how widely a jet's energy is spread. At present jet shape distributions have only been calculated to leading order in perturbative QCD. In this paper we consider how much these predictions should be affected by higher order perturbative corrections, by resummation of enhanced corrections to all orders, and by (power-suppressed) non-perturbative corrections. We also show that current cone-type jet definitions are not infrared safe for final states with more than three partons. Unless this situation is rectified by using improved definitions, hadron collider experiments will never be able to study the internal properties of jets with the quantitative accuracy already achieved in $e^+e^-$ annihilation. |
hep-ph/9604438 | Marco Ciuchini | M. Ciuchini, E. Gabrielli, G.F. Giudice | The Chromomagnetic Dipole Operator and the B Semileptonic Branching
Ratio | 19 pages, 3 eps figures included, replacement with minor changes | Phys.Lett. B388 (1996) 353-365; Erratum-ibid. B393 (1997) 489-490 | 10.1016/S0370-2693(96)01168-9 | CERN-TH/96-73 | hep-ph | null | We consider the possibility of having a large branching ratio for the decay
$b\to s g$ coming from an enhanced Wilson coefficient of the chromomagnetic
dipole operator. We show that values of $BR(b\to s g)$ up to $\sim 10\%$ or
more are compatible with the constraints coming from the CLEO experimental
results on $BR(B\to X_s\gamma)$ and $BR(B\to X_s\phi)$. Such large values can
reconcile the predictions of both the semileptonic branching ratio and the
charm counting with the present experimental results. We also discuss a
supersymmetric model with gluino-mediated flavour violations, which can account
for such large values of $BR(b\to s g)$.
| [
{
"created": "Tue, 30 Apr 1996 16:09:30 GMT",
"version": "v1"
},
{
"created": "Fri, 3 May 1996 14:56:08 GMT",
"version": "v2"
}
] | 2016-09-01 | [
[
"Ciuchini",
"M.",
""
],
[
"Gabrielli",
"E.",
""
],
[
"Giudice",
"G. F.",
""
]
] | We consider the possibility of having a large branching ratio for the decay $b\to s g$ coming from an enhanced Wilson coefficient of the chromomagnetic dipole operator. We show that values of $BR(b\to s g)$ up to $\sim 10\%$ or more are compatible with the constraints coming from the CLEO experimental results on $BR(B\to X_s\gamma)$ and $BR(B\to X_s\phi)$. Such large values can reconcile the predictions of both the semileptonic branching ratio and the charm counting with the present experimental results. We also discuss a supersymmetric model with gluino-mediated flavour violations, which can account for such large values of $BR(b\to s g)$. |
2204.05354 | Hans Raj Sharma | H.R. Sharma (1), Srishti Nagu (2), Jyotsna Singh (2), R.B. Singh (2),
Baba Potukuchi ((1) Department of Physics University of Jammu, Jammu, (2)
Department of Physics Lucknow University, Lucknow) | Study of pion production in $\nu_{\mu}$ interactions on $^{40}$Ar in
DUNE using GENIE and NuWro event generators | 14 pages, 6 figures, 10 tables | null | 10.1134/S1547477122060267 | null | hep-ph | http://creativecommons.org/licenses/by-sa/4.0/ | The study of pion production and the effects of final state interactions
(FSI) are important for data analysis in all neutrino experiments. For energies
at which current neutrino experiments are being operated, a significant
contribution to pion production is made by resonance production process. After
its production, if a pion is absorbed in the nuclear matter, the event may
become indistinguishable from quasi-elastic scattering process and acts as a
background. The estimation of this background is very essential for oscillation
experiments and requires good theoretical models for both pion production at
primary vertex and after FSI. Due to FSI, the number of final state pions is
significantly different from the number produced at primary vertex. As the
neutrino detectors can observe only the final state particles, the correct
information about the particles produced at the primary vertex is overshadowed
by FSI. To overcome this difficulty, a good knowledge of FSI is required which
may be provided by theoretical models incorporated in Monte Carlo (MC) neutrino
event generators. In this work, we will present simulated events for two
different MC generators - GENIE and NuWro, for pion production in $\nu_{\mu}$CC
interactions on $^{40}$Ar target in DUNE experimental set up. A brief outline
of theoretical models used by generators is presented. The results of pion
production are presented in the form of tables showing the occupancy of primary
and final state pion topologies with 100$\%$ detector resolution and with
kinetic energy detector threshold cuts. We observe that NuWro (v-19.02.2) is
more transparent (less responsive) to absorption and charge exchange processes
as compared to GENIE (v-3.00.06), pions are more likely to be absorbed than
created during their intranuclear transport and there is need to improve
detector technology to improve the detector threshold for better results.
| [
{
"created": "Mon, 11 Apr 2022 18:20:07 GMT",
"version": "v1"
},
{
"created": "Tue, 19 Apr 2022 10:28:12 GMT",
"version": "v2"
}
] | 2023-01-25 | [
[
"Sharma",
"H. R.",
""
],
[
"Nagu",
"Srishti",
""
],
[
"Singh",
"Jyotsna",
""
],
[
"Singh",
"R. B.",
""
],
[
"Potukuchi",
"Baba",
""
]
] | The study of pion production and the effects of final state interactions (FSI) are important for data analysis in all neutrino experiments. For energies at which current neutrino experiments are being operated, a significant contribution to pion production is made by resonance production process. After its production, if a pion is absorbed in the nuclear matter, the event may become indistinguishable from quasi-elastic scattering process and acts as a background. The estimation of this background is very essential for oscillation experiments and requires good theoretical models for both pion production at primary vertex and after FSI. Due to FSI, the number of final state pions is significantly different from the number produced at primary vertex. As the neutrino detectors can observe only the final state particles, the correct information about the particles produced at the primary vertex is overshadowed by FSI. To overcome this difficulty, a good knowledge of FSI is required which may be provided by theoretical models incorporated in Monte Carlo (MC) neutrino event generators. In this work, we will present simulated events for two different MC generators - GENIE and NuWro, for pion production in $\nu_{\mu}$CC interactions on $^{40}$Ar target in DUNE experimental set up. A brief outline of theoretical models used by generators is presented. The results of pion production are presented in the form of tables showing the occupancy of primary and final state pion topologies with 100$\%$ detector resolution and with kinetic energy detector threshold cuts. We observe that NuWro (v-19.02.2) is more transparent (less responsive) to absorption and charge exchange processes as compared to GENIE (v-3.00.06), pions are more likely to be absorbed than created during their intranuclear transport and there is need to improve detector technology to improve the detector threshold for better results. |
2307.14999 | Christian T Preuss | Oscar Braun-White, Nigel Glover, Christian T Preuss | A general algorithm to build mixed real and virtual antenna functions
for higher-order calculations | 43 pages; matches version published in JHEP | null | null | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The antenna-subtraction technique has demonstrated remarkable effectiveness
in providing next-to-next-to-leading order in $\alpha_s$ (NNLO) predictions for
a wide range of processes relevant for the Large Hadron Collider. In a previous
paper [1], we demonstrated how to build real-radiation antenna functions for
any number of real emissions directly from a specified list of unresolved
limits. Here, we extend this procedure to the mixed case of real and virtual
radiation, for any number of real and virtual emissions. A novel feature of the
algorithm is the requirement to match the antenna constructed with the correct
unresolved limits to the other elements of the subtraction scheme. We discuss
how this can be achieved and provide a full set of real-virtual NNLO antenna
functions (together with their integration over the final-final unresolved
phase space). We demonstrate that these antennae can be combined with the
real-radiation antennae of Ref. [1] to form a consistent NNLO subtraction
scheme that cancels all explicit and implicit singularities at NNLO. We
anticipate that the improved antenna functions should be more amenable to
automation, thereby making the construction of subtraction terms for more
complicated processes simpler at NNLO.
| [
{
"created": "Thu, 27 Jul 2023 16:52:55 GMT",
"version": "v1"
},
{
"created": "Mon, 18 Dec 2023 08:48:44 GMT",
"version": "v2"
}
] | 2023-12-19 | [
[
"Braun-White",
"Oscar",
""
],
[
"Glover",
"Nigel",
""
],
[
"Preuss",
"Christian T",
""
]
] | The antenna-subtraction technique has demonstrated remarkable effectiveness in providing next-to-next-to-leading order in $\alpha_s$ (NNLO) predictions for a wide range of processes relevant for the Large Hadron Collider. In a previous paper [1], we demonstrated how to build real-radiation antenna functions for any number of real emissions directly from a specified list of unresolved limits. Here, we extend this procedure to the mixed case of real and virtual radiation, for any number of real and virtual emissions. A novel feature of the algorithm is the requirement to match the antenna constructed with the correct unresolved limits to the other elements of the subtraction scheme. We discuss how this can be achieved and provide a full set of real-virtual NNLO antenna functions (together with their integration over the final-final unresolved phase space). We demonstrate that these antennae can be combined with the real-radiation antennae of Ref. [1] to form a consistent NNLO subtraction scheme that cancels all explicit and implicit singularities at NNLO. We anticipate that the improved antenna functions should be more amenable to automation, thereby making the construction of subtraction terms for more complicated processes simpler at NNLO. |
0911.4630 | Giacomo Cacciapaglia | G.Cacciapaglia (IPN Lyon), S.Rai Choudhury (Jamia Millia Islamia),
A.Deandrea (IPN Lyon), N.Gaur (Delhi U.), and Michael Klasen (LPSC Grenoble) | Dileptonic signatures of T-odd quarks at the LHC | 19 pages, 15 figures | JHEP 1003:059,2010 | 10.1007/JHEP03(2010)059 | LPSC 09-167, LYCEN 2009-12 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Little Higgs models are often endowed with a T-parity in order to satisfy
electroweak precision tests and give at the same time a stable particle which
is a candidate for cold dark matter. This type of models predicts a set of new
T-odd fermions in addition to the heavy gauge bosons of the Little Higgs
models, which may show interesting signatures at colliders. In this paper, we
study the signatures of strong and electroweak pair production of the first two
generations of T-odd quarks at the LHC. We focus on the dileptonic signatures
(p p to l l j j MET) with (a) opposite-sign dileptons and (b) same-sign
dileptons.
| [
{
"created": "Tue, 24 Nov 2009 13:44:35 GMT",
"version": "v1"
}
] | 2014-11-20 | [
[
"Cacciapaglia",
"G.",
"",
"IPN Lyon"
],
[
"Choudhury",
"S. Rai",
"",
"Jamia Millia Islamia"
],
[
"Deandrea",
"A.",
"",
"IPN Lyon"
],
[
"Gaur",
"N.",
"",
"Delhi U."
],
[
"Klasen",
"Michael",
"",
"LPSC Grenoble"
]
] | Little Higgs models are often endowed with a T-parity in order to satisfy electroweak precision tests and give at the same time a stable particle which is a candidate for cold dark matter. This type of models predicts a set of new T-odd fermions in addition to the heavy gauge bosons of the Little Higgs models, which may show interesting signatures at colliders. In this paper, we study the signatures of strong and electroweak pair production of the first two generations of T-odd quarks at the LHC. We focus on the dileptonic signatures (p p to l l j j MET) with (a) opposite-sign dileptons and (b) same-sign dileptons. |
hep-ph/9911410 | Andrzej Czarnecki | Andrzej Czarnecki and Savely G. Karshenboim | Decays of Positronium | Talk given at the 14th International Workshop on High Energy Physics
and Quantum Field Theory (QFTHEP99), May 1999, Moscow, Russia, to appear in
the Proceedings; 9 pages, latex | B.B. Levchenko and V.I. Savrin (eds.), Proc. of the 14th
International Workshop on High Energy Physics and Quantum Field Theory
(QFTHEP99, Moscow 1999), MSU-Press 2000, pp. 538 - 544. | null | BNL-HET-99/37 | hep-ph | null | We briefly review the theoretical and experimental results concerning decays
of positronium. Possible solutions of the "orthopositronium lifetime puzzle"
are discussed. Positronium annihilation into neutrinos is examined and
disagreement is found with previously published results.
| [
{
"created": "Fri, 19 Nov 1999 14:18:30 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Czarnecki",
"Andrzej",
""
],
[
"Karshenboim",
"Savely G.",
""
]
] | We briefly review the theoretical and experimental results concerning decays of positronium. Possible solutions of the "orthopositronium lifetime puzzle" are discussed. Positronium annihilation into neutrinos is examined and disagreement is found with previously published results. |
1906.05810 | Claudio Coriano | Claudio Corian\`o, Paul H. Frampton, Alessandro Tatullo, Dimosthenis
Theofilopoulos | An Axion-Like Particle from an $SO(10)$ Seesaw with $U(1)_X$ | 18 pages, revised final version, acepted for pubblication on Physics
Letters B | null | 10.1016/j.physletb.2020.135273 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We investigate the decoupling of heavy right handed neutrinos in the context
of an SO(10) GUT model, where a remnant anomalous symmetry is $U(1)_{X}$. In
this model the see-saw mechanism which generates the neutrino masses is
intertwined with the Stueckelberg mechanism, which leaves the CP-odd phase of a
very heavy Higgs in the low energy spectrum as an axion-like particle. Such
pseudoscalar is predicted to be ultralight, in the $10^{-20}$ eV mass range. In
this scenario, the remnant anomalous $X$ symmetry of the particles of the
Standard Model is interpreted as due to the incomplete decoupling of the right
handed neutrino sector. We illustrate this scenario including its realisation
in the context of SO(10).
| [
{
"created": "Thu, 13 Jun 2019 16:50:29 GMT",
"version": "v1"
},
{
"created": "Fri, 14 Jun 2019 07:30:22 GMT",
"version": "v2"
},
{
"created": "Sat, 4 Jan 2020 11:33:39 GMT",
"version": "v3"
}
] | 2020-02-19 | [
[
"Corianò",
"Claudio",
""
],
[
"Frampton",
"Paul H.",
""
],
[
"Tatullo",
"Alessandro",
""
],
[
"Theofilopoulos",
"Dimosthenis",
""
]
] | We investigate the decoupling of heavy right handed neutrinos in the context of an SO(10) GUT model, where a remnant anomalous symmetry is $U(1)_{X}$. In this model the see-saw mechanism which generates the neutrino masses is intertwined with the Stueckelberg mechanism, which leaves the CP-odd phase of a very heavy Higgs in the low energy spectrum as an axion-like particle. Such pseudoscalar is predicted to be ultralight, in the $10^{-20}$ eV mass range. In this scenario, the remnant anomalous $X$ symmetry of the particles of the Standard Model is interpreted as due to the incomplete decoupling of the right handed neutrino sector. We illustrate this scenario including its realisation in the context of SO(10). |
1410.2930 | Michael Eides | Michael I. Eides and Valery A. Shelyuto | Three-Loop Contributions to Hyperfine Splitting: Muon Loop
Light-by-Light Insertion and Other Closed Lepton Loops | 23 pages, 9 figures | Phys. Rev. D 90, 113002 (2014) | 10.1103/PhysRevD.90.113002 | UK/14-06 | hep-ph physics.atom-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The muon and tauon light-by-light scattering contributions to hyperfine
splitting in muonium are calculated. These results conclude calculation of all
hard three-loop contributions to hyperfine splitting containing graphs with
closed fermion loops. We discuss the special role that the lepton anomalous
magnetic moments play in these calculations. The full result for all three-loop
radiative-recoil corrections to hyperfine splitting generated by the graphs
with closed lepton loops is presented.
| [
{
"created": "Sat, 11 Oct 2014 00:12:33 GMT",
"version": "v1"
}
] | 2014-12-10 | [
[
"Eides",
"Michael I.",
""
],
[
"Shelyuto",
"Valery A.",
""
]
] | The muon and tauon light-by-light scattering contributions to hyperfine splitting in muonium are calculated. These results conclude calculation of all hard three-loop contributions to hyperfine splitting containing graphs with closed fermion loops. We discuss the special role that the lepton anomalous magnetic moments play in these calculations. The full result for all three-loop radiative-recoil corrections to hyperfine splitting generated by the graphs with closed lepton loops is presented. |
hep-ph/9912485 | Subhendra Mohanty | J. A. Grifols, Eduard Masso and Subhendra Mohanty | Production of light pseudoscalars in external electromagnetic fields by
the Schwinger mechanism | 25 pages including 9 figures. Version that matches published version | Phys.Rev. D65 (2002) 055004 | 10.1103/PhysRevD.65.055004 | PRL-TH-99/006 | hep-ph | null | We generalize the Schwinger mechanism and calculate the probability of the
decay of intense electromagnetic fields to pseudoscalar particles. We also
point out that our estimate for axion emission in a previous paper was
incorrect.
| [
{
"created": "Thu, 23 Dec 1999 09:53:14 GMT",
"version": "v1"
},
{
"created": "Thu, 1 Mar 2001 09:27:44 GMT",
"version": "v2"
},
{
"created": "Tue, 23 Apr 2002 09:02:14 GMT",
"version": "v3"
}
] | 2009-10-31 | [
[
"Grifols",
"J. A.",
""
],
[
"Masso",
"Eduard",
""
],
[
"Mohanty",
"Subhendra",
""
]
] | We generalize the Schwinger mechanism and calculate the probability of the decay of intense electromagnetic fields to pseudoscalar particles. We also point out that our estimate for axion emission in a previous paper was incorrect. |
2309.15438 | Nosheen Akbar | Ishrat Asghar, Nosheen Akbar | Spectrum and Decay Properties of Bottomonium Mesons | 15 pages, 1 figure | null | null | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We calculate the spectrum and wave functions (WFs) of various states of
bottomonium mesons ($b\overline{b}$) using a non-relativistic quark potential
model (NRQPM). The calculated WFs are used to compute the radiative widths of
various states of $b\overline{b}$. The strong decays widths of bottomonium
states are also calculated using $^3P_0$ model by choosing simple harmonic
oscillator wave functions (SHOWFs). The $\beta$ of SHOWFs for various states of
the mesons are measured by fitting the numerical wave functions. The radiative
and strong decay widths are used to calculate the branching ratios of
$b\overline{b}$ mesons. We also compare our calculated masses and widths with
available experimental data.
| [
{
"created": "Wed, 27 Sep 2023 06:57:47 GMT",
"version": "v1"
}
] | 2023-09-28 | [
[
"Asghar",
"Ishrat",
""
],
[
"Akbar",
"Nosheen",
""
]
] | We calculate the spectrum and wave functions (WFs) of various states of bottomonium mesons ($b\overline{b}$) using a non-relativistic quark potential model (NRQPM). The calculated WFs are used to compute the radiative widths of various states of $b\overline{b}$. The strong decays widths of bottomonium states are also calculated using $^3P_0$ model by choosing simple harmonic oscillator wave functions (SHOWFs). The $\beta$ of SHOWFs for various states of the mesons are measured by fitting the numerical wave functions. The radiative and strong decay widths are used to calculate the branching ratios of $b\overline{b}$ mesons. We also compare our calculated masses and widths with available experimental data. |
hep-ph/0201037 | null | O.Voskresenskaya | Analytic Form Factors of Hydrogenlike Atoms for Discrete-Continuum
Transitions. II. General Case | Latex, 5 pages; no figures, minor misprints corrected | null | null | null | hep-ph | null | A general formula for bound-continuous transition form factors is derived. It
is shown that these form factors can be represented in the form of finite sum
of terms with simple analytical structure.
| [
{
"created": "Mon, 7 Jan 2002 20:09:05 GMT",
"version": "v1"
},
{
"created": "Mon, 7 Jan 2002 22:14:58 GMT",
"version": "v2"
},
{
"created": "Wed, 5 Mar 2003 18:43:35 GMT",
"version": "v3"
}
] | 2007-05-23 | [
[
"Voskresenskaya",
"O.",
""
]
] | A general formula for bound-continuous transition form factors is derived. It is shown that these form factors can be represented in the form of finite sum of terms with simple analytical structure. |
hep-ph/9910447 | Ofelia | F. Buccella and O. Pisanti | Neutrino Masses in SO(10) Theories | 10 pages, Talk given by F. Buccella at the `Meeting in honour of
Samoil Bilenky', Torino 1999 | null | null | DSF-27/99 | hep-ph | null | We review the status of a class of gauge unified models based on SO(10) group
and discuss the main phenomenological implications of these models in
particular for neutrino masses.
| [
{
"created": "Fri, 22 Oct 1999 15:16:53 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Buccella",
"F.",
""
],
[
"Pisanti",
"O.",
""
]
] | We review the status of a class of gauge unified models based on SO(10) group and discuss the main phenomenological implications of these models in particular for neutrino masses. |
1302.5846 | Jae Yong Lee | Jae Yong Lee | Gaugino masses from gravitino at one loop | 5 pages, 3 figures, v2: text refined, v3: text refined, references
added, v4: references added | null | null | null | hep-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The N=1 supergravity coupled to chiral and Yang-Mills superfields is regarded
as the ultraviolet theory of the supersymmetric Standard Model. The gravitino
acquires a mass from the hidden sector and participate in mediating
supersymmetry breaking to the visible sector. We consider the quantum effects
of the gravitino and evaluate its contribution to the gaugino masses at one
loop level, which turns out to be irrespective of the SM gauge couplings. Due
to the universality of gravitino, its contribution to the gaugino masses can
significantly modify the gaugino mass relations of other supersymmetry breaking
mechanisms depending on the gravitino mass. For a given gaugino mass the
gravitino mass cannot be arbitrarily large even when other supersymmetry
breaking mechanisms are dominant.
| [
{
"created": "Sat, 23 Feb 2013 21:46:33 GMT",
"version": "v1"
},
{
"created": "Mon, 11 Mar 2013 04:35:36 GMT",
"version": "v2"
},
{
"created": "Wed, 13 Mar 2013 00:03:48 GMT",
"version": "v3"
},
{
"created": "Mon, 18 Mar 2013 10:23:16 GMT",
"version": "v4"
}
] | 2013-03-19 | [
[
"Lee",
"Jae Yong",
""
]
] | The N=1 supergravity coupled to chiral and Yang-Mills superfields is regarded as the ultraviolet theory of the supersymmetric Standard Model. The gravitino acquires a mass from the hidden sector and participate in mediating supersymmetry breaking to the visible sector. We consider the quantum effects of the gravitino and evaluate its contribution to the gaugino masses at one loop level, which turns out to be irrespective of the SM gauge couplings. Due to the universality of gravitino, its contribution to the gaugino masses can significantly modify the gaugino mass relations of other supersymmetry breaking mechanisms depending on the gravitino mass. For a given gaugino mass the gravitino mass cannot be arbitrarily large even when other supersymmetry breaking mechanisms are dominant. |
1606.09434 | Keisuke Ohtani | Keisuke Ohtani, Philipp Gubler, Makoto Oka | Negative-parity nucleon excited state in nuclear matter | 13 pages, 6 figures, 2 tables; published version | Phys. Rev. C 94, 045203 (2016) | 10.1103/PhysRevC.94.045203 | null | hep-ph nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Spectral functions of the nucleon and its negative parity excited state in
nuclear matter are studied using QCD sum rules and the maximum entropy method
(MEM). It is found that in-medium modifications of the spectral functions are
attributed mainly to density dependencies of the $\langle \bar{q}q \rangle $
and $\langle q^{\dagger}q \rangle $ condensates. The MEM reproduces the
lowest-energy peaks of both the positive and negative parity nucleon states at
finite density up to $\rho \sim \rho_N$ (normal nuclear matter density). As the
density grows, the residue of the nucleon ground state decreases gradually
while the residue of the lowest negative parity excited state increases
slightly. On the other hand, the positions of the peaks, which correspond to
the total energies of these states, are almost density independent for both
parity states. The density dependencies of the effective masses and vector
self-energies are also extracted by assuming the mean-field green functions for
the peak states. We find that, as the density increases, the nucleon effective
mass decreases while the vector self-energy increases. The density dependence
of these quantities for the negative parity state on the other hand turns out
to be relatively weak.
| [
{
"created": "Thu, 30 Jun 2016 11:20:20 GMT",
"version": "v1"
},
{
"created": "Thu, 13 Oct 2016 05:12:07 GMT",
"version": "v2"
}
] | 2016-10-14 | [
[
"Ohtani",
"Keisuke",
""
],
[
"Gubler",
"Philipp",
""
],
[
"Oka",
"Makoto",
""
]
] | Spectral functions of the nucleon and its negative parity excited state in nuclear matter are studied using QCD sum rules and the maximum entropy method (MEM). It is found that in-medium modifications of the spectral functions are attributed mainly to density dependencies of the $\langle \bar{q}q \rangle $ and $\langle q^{\dagger}q \rangle $ condensates. The MEM reproduces the lowest-energy peaks of both the positive and negative parity nucleon states at finite density up to $\rho \sim \rho_N$ (normal nuclear matter density). As the density grows, the residue of the nucleon ground state decreases gradually while the residue of the lowest negative parity excited state increases slightly. On the other hand, the positions of the peaks, which correspond to the total energies of these states, are almost density independent for both parity states. The density dependencies of the effective masses and vector self-energies are also extracted by assuming the mean-field green functions for the peak states. We find that, as the density increases, the nucleon effective mass decreases while the vector self-energy increases. The density dependence of these quantities for the negative parity state on the other hand turns out to be relatively weak. |
1203.6088 | Ruben Sandapen | J. R. Forshaw and R. Sandapen | An AdS/QCD holographic wavefunction for the rho meson and diffractive
rho meson electroproduction | 9 pages, 4 figures. Figure 3 added to illustrate that the AdS/QCD
prediction is impressive. Accepted for publication in Physical Review Letters | null | 10.1103/PhysRevLett.109.081601 | MAN/HEP/2012/12 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We show that AdS/QCD generates predictions for the rate of diffractive rho
meson electroproduction that are in agreement with data collected at the HERA
electron-proton collider.
| [
{
"created": "Tue, 27 Mar 2012 21:06:31 GMT",
"version": "v1"
},
{
"created": "Wed, 18 Jul 2012 12:17:26 GMT",
"version": "v2"
}
] | 2013-05-30 | [
[
"Forshaw",
"J. R.",
""
],
[
"Sandapen",
"R.",
""
]
] | We show that AdS/QCD generates predictions for the rate of diffractive rho meson electroproduction that are in agreement with data collected at the HERA electron-proton collider. |
1005.1676 | Annette Holtkamp | Joseph D. Lykken | Beyond the Standard Model | 10 pages, 5 figures, Lectures given at the 2009 European School of
High-Energy Physics, Bautzen, Germany, 14-27 Jun 2009 | CERN Yellow Report CERN-2010-002, pp. 101-109 | null | FERMILAB-CONF-10-103-T | hep-ph | http://creativecommons.org/licenses/by/3.0/ | Six major frameworks have emerged attempting to describe particle physics
beyond the Standard Model. Despite their different theoretical genera, these
frameworks have a number of common phenomenological features and problems.
While it will be possible (and desirable) to conduct model-independent searches
for new physics at the LHC, it is equally important to develop robust methods
to discriminate between BSM 'look-alikes'.
| [
{
"created": "Mon, 10 May 2010 21:27:47 GMT",
"version": "v1"
},
{
"created": "Thu, 6 Jan 2011 16:09:40 GMT",
"version": "v2"
}
] | 2015-03-17 | [
[
"Lykken",
"Joseph D.",
""
]
] | Six major frameworks have emerged attempting to describe particle physics beyond the Standard Model. Despite their different theoretical genera, these frameworks have a number of common phenomenological features and problems. While it will be possible (and desirable) to conduct model-independent searches for new physics at the LHC, it is equally important to develop robust methods to discriminate between BSM 'look-alikes'. |
1907.06059 | Mohamed Abu-Shady | M. Abu-Shady | Quarkonium Masses in a hot QCD Medium Using Conformable Fractional of
the Nikiforov-Uvarov Method | 15 pages, 4 figures | null | 10.1142/S0217751X19502014 | null | hep-ph | http://creativecommons.org/publicdomain/zero/1.0/ | By using conformable fractional of the Nikiforov-Uvarov (CF-NU) method, the
radial Schrodinger equation is analytically solved. The energy eigenvalues and
corresponding functions are obtained, in which the dependent temperature
potential is employed. The effect of fraction-order parameter is studied on
heavy-quarkonium masses such as charmonium and bottomonium in a hot QCD medium
in the 3D and the higher dimensional space. A comparison is studied with recent
works. We conclude that the fractional-order plays an important role in a hot
QCD medium in the 3D and higher-dimensional space.
| [
{
"created": "Sat, 13 Jul 2019 11:57:36 GMT",
"version": "v1"
}
] | 2020-01-08 | [
[
"Abu-Shady",
"M.",
""
]
] | By using conformable fractional of the Nikiforov-Uvarov (CF-NU) method, the radial Schrodinger equation is analytically solved. The energy eigenvalues and corresponding functions are obtained, in which the dependent temperature potential is employed. The effect of fraction-order parameter is studied on heavy-quarkonium masses such as charmonium and bottomonium in a hot QCD medium in the 3D and the higher dimensional space. A comparison is studied with recent works. We conclude that the fractional-order plays an important role in a hot QCD medium in the 3D and higher-dimensional space. |
hep-ph/0609113 | Ritesh Singh K. | Rohini M. Godbole, Sabine Kraml, Saurabh D. Rindani, Ritesh K. Singh | Probing CP-violating Higgs contributions in gamma-gamma -> f anti-f
through fermion polarization | 14 pages, 14 figures, typeset in revtex4. Version which has appeared
in Physical Review D; typos in two references corrected | Phys.Rev.D74:095006,2006; Erratum-ibid.D74:119901,2006 | 10.1103/PhysRevD.74.095006 10.1103/PhysRevD.74.119901 | IISc-CHEP/4/06, CERN-PH-TH/2006-117, LPT-ORSAY-06-56 | hep-ph | null | We discuss the use of fermion polarization for studying neutral Higgs bosons
at a photon collider. To this aim we construct polarization asymmetries which
can isolate the contribution of a Higgs boson $\phi$ in $\gamma\gamma\to f \bar
f$, $f=\tau/t$, from that of the QED continuum. This can help in getting
information on the $\gamma\gamma\phi$ coupling in case $\phi$ is a CP
eigenstate. We also construct CP-violating asymmetries which can probe CP
mixing in case $\phi$ has indeterminate CP. Furthermore, we take the MSSM with
CP violation as an example to demonstrate the potential of these asymmetries in
a numerical analysis. We find that these asymmetries are sensitive to the
presence of a Higgs boson as well as its CP properties over a wide range of
MSSM parameters. In particular, the method suggested can cover the region where
a light Higgs boson may have been missed by LEP due to CP violation in the
Higgs sector, and may be missed as well at the LHC.
| [
{
"created": "Tue, 12 Sep 2006 12:38:09 GMT",
"version": "v1"
},
{
"created": "Mon, 27 Nov 2006 17:22:05 GMT",
"version": "v2"
}
] | 2014-11-18 | [
[
"Godbole",
"Rohini M.",
""
],
[
"Kraml",
"Sabine",
""
],
[
"Rindani",
"Saurabh D.",
""
],
[
"Singh",
"Ritesh K.",
""
]
] | We discuss the use of fermion polarization for studying neutral Higgs bosons at a photon collider. To this aim we construct polarization asymmetries which can isolate the contribution of a Higgs boson $\phi$ in $\gamma\gamma\to f \bar f$, $f=\tau/t$, from that of the QED continuum. This can help in getting information on the $\gamma\gamma\phi$ coupling in case $\phi$ is a CP eigenstate. We also construct CP-violating asymmetries which can probe CP mixing in case $\phi$ has indeterminate CP. Furthermore, we take the MSSM with CP violation as an example to demonstrate the potential of these asymmetries in a numerical analysis. We find that these asymmetries are sensitive to the presence of a Higgs boson as well as its CP properties over a wide range of MSSM parameters. In particular, the method suggested can cover the region where a light Higgs boson may have been missed by LEP due to CP violation in the Higgs sector, and may be missed as well at the LHC. |
2305.01785 | Derek Kimball | S. Afach, D. Aybas Tumturk, H. Bekker, B. C. Buchler, D. Budker, K.
Cervantes, A. Derevianko, J. Eby, N. L. Figueroa, R. Folman, D. Gavil'an
Martin, M. Givon, Z. D. Grujic, H. Guo, P. Hamilton, M. P. Hedges, D. F.
Jackson Kimball, S. Khamis, D. Kim, E. Klinger, A. Kryemadhi, X. Liu, G.
Lukasiewicz, H. Masia-Roig, M. Padniuk, C. A. Palm, S. Y. Park, H. R.
Pearson, X. Peng, M. Pospelov, S. Pustelny, Y. Rosenzweig, O. M. Ruimi, T.
Scholtes, P. C. Segura, Y. K. Semertzidis, Y. C. Shin, J. A. Smiga, Y. V.
Stadnik, J. E. Stalnaker, I. A. Sulai, D. Tandon, K. Vu, A. Weis, A.
Wickenbrock, T. Z. Wilson, T. Wu, W. Xiao, Y. Yang, D. Yu, F. Yu, J. Zhang,
and Y. Zhao | What can a GNOME do? Search targets for the Global Network of Optical
Magnetometers for Exotic physics searches | 22 pages, 12 figures, submitted to Annalen der Physik | Annalen der Physik 2023, 2300083 (2023) | 10.1002/andp.202300083 | null | hep-ph astro-ph.IM hep-ex physics.atom-ph quant-ph | http://creativecommons.org/licenses/by/4.0/ | Numerous observations suggest that there exist undiscovered
beyond-the-Standard-Model particles and fields. Because of their unknown
nature, these exotic particles and fields could interact with Standard Model
particles in many different ways and assume a variety of possible
configurations. Here we present an overview of the Global Network of Optical
Magnetometers for Exotic physics searches (GNOME), our ongoing experimental
program designed to test a wide range of exotic physics scenarios. The GNOME
experiment utilizes a worldwide network of shielded atomic magnetometers (and,
more recently, comagnetometers) to search for spatially and temporally
correlated signals due to torques on atomic spins from exotic fields of
astrophysical origin. We survey the temporal characteristics of a variety of
possible signals currently under investigation such as those from topological
defect dark matter (axion-like particle domain walls), axion-like particle
stars, solitons of complex-valued scalar fields (Q-balls), stochastic
fluctuations of bosonic dark matter fields, a solar axion-like particle halo,
and bursts of ultralight bosonic fields produced by cataclysmic astrophysical
events such as binary black hole mergers.
| [
{
"created": "Tue, 2 May 2023 21:13:26 GMT",
"version": "v1"
},
{
"created": "Thu, 4 May 2023 23:48:36 GMT",
"version": "v2"
}
] | 2023-12-21 | [
[
"Afach",
"S.",
""
],
[
"Tumturk",
"D. Aybas",
""
],
[
"Bekker",
"H.",
""
],
[
"Buchler",
"B. C.",
""
],
[
"Budker",
"D.",
""
],
[
"Cervantes",
"K.",
""
],
[
"Derevianko",
"A.",
""
],
[
"Eby",
"J.",
""
],
[
"Figueroa",
"N. L.",
""
],
[
"Folman",
"R.",
""
],
[
"Martin",
"D. Gavil'an",
""
],
[
"Givon",
"M.",
""
],
[
"Grujic",
"Z. D.",
""
],
[
"Guo",
"H.",
""
],
[
"Hamilton",
"P.",
""
],
[
"Hedges",
"M. P.",
""
],
[
"Kimball",
"D. F. Jackson",
""
],
[
"Khamis",
"S.",
""
],
[
"Kim",
"D.",
""
],
[
"Klinger",
"E.",
""
],
[
"Kryemadhi",
"A.",
""
],
[
"Liu",
"X.",
""
],
[
"Lukasiewicz",
"G.",
""
],
[
"Masia-Roig",
"H.",
""
],
[
"Padniuk",
"M.",
""
],
[
"Palm",
"C. A.",
""
],
[
"Park",
"S. Y.",
""
],
[
"Pearson",
"H. R.",
""
],
[
"Peng",
"X.",
""
],
[
"Pospelov",
"M.",
""
],
[
"Pustelny",
"S.",
""
],
[
"Rosenzweig",
"Y.",
""
],
[
"Ruimi",
"O. M.",
""
],
[
"Scholtes",
"T.",
""
],
[
"Segura",
"P. C.",
""
],
[
"Semertzidis",
"Y. K.",
""
],
[
"Shin",
"Y. C.",
""
],
[
"Smiga",
"J. A.",
""
],
[
"Stadnik",
"Y. V.",
""
],
[
"Stalnaker",
"J. E.",
""
],
[
"Sulai",
"I. A.",
""
],
[
"Tandon",
"D.",
""
],
[
"Vu",
"K.",
""
],
[
"Weis",
"A.",
""
],
[
"Wickenbrock",
"A.",
""
],
[
"Wilson",
"T. Z.",
""
],
[
"Wu",
"T.",
""
],
[
"Xiao",
"W.",
""
],
[
"Yang",
"Y.",
""
],
[
"Yu",
"D.",
""
],
[
"Yu",
"F.",
""
],
[
"Zhang",
"J.",
""
],
[
"Zhao",
"Y.",
""
]
] | Numerous observations suggest that there exist undiscovered beyond-the-Standard-Model particles and fields. Because of their unknown nature, these exotic particles and fields could interact with Standard Model particles in many different ways and assume a variety of possible configurations. Here we present an overview of the Global Network of Optical Magnetometers for Exotic physics searches (GNOME), our ongoing experimental program designed to test a wide range of exotic physics scenarios. The GNOME experiment utilizes a worldwide network of shielded atomic magnetometers (and, more recently, comagnetometers) to search for spatially and temporally correlated signals due to torques on atomic spins from exotic fields of astrophysical origin. We survey the temporal characteristics of a variety of possible signals currently under investigation such as those from topological defect dark matter (axion-like particle domain walls), axion-like particle stars, solitons of complex-valued scalar fields (Q-balls), stochastic fluctuations of bosonic dark matter fields, a solar axion-like particle halo, and bursts of ultralight bosonic fields produced by cataclysmic astrophysical events such as binary black hole mergers. |
1810.02297 | Miguel Echevarria | Alessandro Bacchetta, Miguel G. Echevarria | QCD$\times$QED evolution of TMDs | 9 pages, 3 figures. v2: minor corrections, accepted for publication
in Phys. Lett. B | null | 10.1016/j.physletb.2018.11.019 | null | hep-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We consider for the first time the QED corrections to the evolution of
(un)polarized quark and gluon transverse-momentum-dependent distribution and
fragmentation functions (TMDs in general). By extending their operator
definition to QCD$\times$QED, we provide the mixed new anomalous dimensions up
to ${\cal O}(\alpha_s\alpha)$ and the pure QED ones up to ${\cal O}(\alpha^2)$.
These new corrections are universal for all TMDs up to the flavor of the
considered parton, i.e., the full flavor universality of TMD evolution found in
pure QCD is broken in QCD$\times$QED by the presence of the electric charge. In
addition, we provide the leading-order QED corrections to the matching
coefficients of the unpolarized quark TMD parton distribution function onto its
integrated counterparts at ${\cal O}(\alpha_s^0\alpha)$.
| [
{
"created": "Thu, 4 Oct 2018 16:22:18 GMT",
"version": "v1"
},
{
"created": "Wed, 14 Nov 2018 13:47:17 GMT",
"version": "v2"
}
] | 2018-11-21 | [
[
"Bacchetta",
"Alessandro",
""
],
[
"Echevarria",
"Miguel G.",
""
]
] | We consider for the first time the QED corrections to the evolution of (un)polarized quark and gluon transverse-momentum-dependent distribution and fragmentation functions (TMDs in general). By extending their operator definition to QCD$\times$QED, we provide the mixed new anomalous dimensions up to ${\cal O}(\alpha_s\alpha)$ and the pure QED ones up to ${\cal O}(\alpha^2)$. These new corrections are universal for all TMDs up to the flavor of the considered parton, i.e., the full flavor universality of TMD evolution found in pure QCD is broken in QCD$\times$QED by the presence of the electric charge. In addition, we provide the leading-order QED corrections to the matching coefficients of the unpolarized quark TMD parton distribution function onto its integrated counterparts at ${\cal O}(\alpha_s^0\alpha)$. |
2302.03948 | Chia-Min Lin | Chia-Min Lin | Hilltop Sneutrino Hybrid Inflation | 10 pages, 1 figure | null | null | null | hep-ph astro-ph.CO hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this work, we consider a hilltop version of the (supersymmetric) sneutrino
hybrid inflation where the right-handed sneutrino field plays the role of the
inflaton field. This model is a type III hilltop inflation that can produce a
spectral index $n_s=0.96$ which fits perfectly to experimental observations
without fine-tuning of parameters. We also briefly consider nonthermal
leptogenesis via the decay of the right-handed sneutrino inflaton field after
inflation.
| [
{
"created": "Wed, 8 Feb 2023 08:59:45 GMT",
"version": "v1"
}
] | 2023-02-09 | [
[
"Lin",
"Chia-Min",
""
]
] | In this work, we consider a hilltop version of the (supersymmetric) sneutrino hybrid inflation where the right-handed sneutrino field plays the role of the inflaton field. This model is a type III hilltop inflation that can produce a spectral index $n_s=0.96$ which fits perfectly to experimental observations without fine-tuning of parameters. We also briefly consider nonthermal leptogenesis via the decay of the right-handed sneutrino inflaton field after inflation. |
hep-ph/9402271 | Roger Phillips | R.J.N. Phillips | Solar Neutrino Oscillations | 8 pages, 9 figures (not included), RAL-94-017 | null | null | null | hep-ph | null | Invited review talk at the International Conference on Non-Accelerator
Particle Physics (ICNAPP-94), Bangalore, India, 2-9 January 1994. Latex file.
| [
{
"created": "Fri, 11 Feb 1994 13:02:00 GMT",
"version": "v1"
}
] | 2009-09-25 | [
[
"Phillips",
"R. J. N.",
""
]
] | Invited review talk at the International Conference on Non-Accelerator Particle Physics (ICNAPP-94), Bangalore, India, 2-9 January 1994. Latex file. |
1211.3011 | Christoph Englert | Jeppe R. Andersen, Christoph Englert, Michael Spannowsky | Polishing a shiny Higgs with matrix elements | 8 pages, 7 figures | null | 10.1103/PhysRevD.87.015019 | IPPP/12/86, DCPT/12/172 | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | After the recent discovery of a Standard Model Higgs boson-like particle at
the LHC, the question of its couplings to known and unknown matter is eminent.
In this letter, we present a method that allows for an enhancement in
S/B(irreducible) of the order of 100% in $pp\to (h\to \gamma\gamma) jj$ for a
center of mass energy of 8 and 14 TeV. This is achieved by applying the matrix
element method. We discuss the implications of detector resolution effects and
various approximations of the involved event simulation and reconstruction. The
matrix element method provides a reliable, stable, and efficient handle to
separate signal from background, and the gluon and weak boson fusion components
involved in this process. Employing this method, a more precise Higgs boson
coupling extraction can be obtained, and our results are of immediate relevance
for current searches.
| [
{
"created": "Tue, 13 Nov 2012 14:54:52 GMT",
"version": "v1"
}
] | 2013-05-30 | [
[
"Andersen",
"Jeppe R.",
""
],
[
"Englert",
"Christoph",
""
],
[
"Spannowsky",
"Michael",
""
]
] | After the recent discovery of a Standard Model Higgs boson-like particle at the LHC, the question of its couplings to known and unknown matter is eminent. In this letter, we present a method that allows for an enhancement in S/B(irreducible) of the order of 100% in $pp\to (h\to \gamma\gamma) jj$ for a center of mass energy of 8 and 14 TeV. This is achieved by applying the matrix element method. We discuss the implications of detector resolution effects and various approximations of the involved event simulation and reconstruction. The matrix element method provides a reliable, stable, and efficient handle to separate signal from background, and the gluon and weak boson fusion components involved in this process. Employing this method, a more precise Higgs boson coupling extraction can be obtained, and our results are of immediate relevance for current searches. |
2205.13354 | Jian-Bo Cheng | Jian-Bo Cheng, Zi-Yang Lin and Shi-Lin Zhu | Double-charm tetraquark under the complex scaling method | 11 pages, 15 figures | null | 10.1103/PhysRevD.106.016012 | null | hep-ph nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The LHCb Collaboration discovered a double-charm tetraquark $T_{cc}^{+}$ with
a very small width. We investigate the $T_{cc}^{+}$ as a $DD^{*}$ molecule with
$J^{P}=1^{+}$ in the framework of the one-boson-exchange potential model. The
isospin breaking effect and $S-D$ wave coupling are taken into account
carefully. We adopt the complex scaling method (CSM) to study the $DD^{*}$
system and obtain a quasibound state corresponding to the $T_{cc}^{+}$. Its
binding energy relative to the $D^{0}D^{*+}$ and width are $-354$ keV and $61$
keV respectively. The isospin breaking effect is found to be enormous, and the
$S-$wave $D^{0}D^{*+}$ and $D^{+}D^{*0}$ components give dominant contributions
with the probabilities of $72.1\%$ and $27.1\%$ respectively. In addition, we
do not find any resonances in the $DD^{*}$ system. As a by-product, we study
the $X(3872)$ as a $(D\bar{D}^*-D^*\bar{D})/\sqrt{2}$ molecule with
$J^{PC}=1^{++}$. We also find a quasibound state corresponding to the
$X(3872)$. Its binding energy relative to the $D^{0}\bar{D}^{*0}$ threshold and
width are $-111$ keV and $26$ keV respectively. The $S-$wave
$(D^{0}\bar{D}^{*0}-D^{*0}\bar{D}^{0})/\sqrt{2}$ component dominates this state
with the probability of $92.7\%$.
| [
{
"created": "Thu, 26 May 2022 13:34:42 GMT",
"version": "v1"
}
] | 2022-08-17 | [
[
"Cheng",
"Jian-Bo",
""
],
[
"Lin",
"Zi-Yang",
""
],
[
"Zhu",
"Shi-Lin",
""
]
] | The LHCb Collaboration discovered a double-charm tetraquark $T_{cc}^{+}$ with a very small width. We investigate the $T_{cc}^{+}$ as a $DD^{*}$ molecule with $J^{P}=1^{+}$ in the framework of the one-boson-exchange potential model. The isospin breaking effect and $S-D$ wave coupling are taken into account carefully. We adopt the complex scaling method (CSM) to study the $DD^{*}$ system and obtain a quasibound state corresponding to the $T_{cc}^{+}$. Its binding energy relative to the $D^{0}D^{*+}$ and width are $-354$ keV and $61$ keV respectively. The isospin breaking effect is found to be enormous, and the $S-$wave $D^{0}D^{*+}$ and $D^{+}D^{*0}$ components give dominant contributions with the probabilities of $72.1\%$ and $27.1\%$ respectively. In addition, we do not find any resonances in the $DD^{*}$ system. As a by-product, we study the $X(3872)$ as a $(D\bar{D}^*-D^*\bar{D})/\sqrt{2}$ molecule with $J^{PC}=1^{++}$. We also find a quasibound state corresponding to the $X(3872)$. Its binding energy relative to the $D^{0}\bar{D}^{*0}$ threshold and width are $-111$ keV and $26$ keV respectively. The $S-$wave $(D^{0}\bar{D}^{*0}-D^{*0}\bar{D}^{0})/\sqrt{2}$ component dominates this state with the probability of $92.7\%$. |
hep-ph/0608100 | Miguel Nebot | F. J. Botella (Valencia U. & Valencia U., IFIC), G. C. Branco (Lisbon,
IST & Munich, Tech. U.), M. Nebot (Lisbon, IST) | CP violation and limits on New Physics including recent $B_s$
measurements | 29 pages, 31 figures; updated analyses and references | Nucl.Phys.B768:1-20,2007 | 10.1016/j.nuclphysb.2006.12.022 | IFIC/06-22, FTUV-06-0809 | hep-ph hep-ex | null | We analyse present constraints on the SM parameter space and derive, in a
model independent way, various bounds on New Physics contributions to
$B_d^0$--$\bar B_d^0$ and $B_s^0$--$\bar B_s^0$ mixings. Our analyses include
information on a large set of asymmetries, leading to the measurement of the
CKM phases $\gamma$ and $\bar\beta$, as well as recent data from D0 and CDF
related to the $B_s^0$--$\bar B_s^0$ system such as the measurement of $\Delta
M_{B_s}$, $A_{SL}$ and $\Delta\Gamma_{s}^{CP}$. We examine in detail several
observables such as the asymmetries $A_{sl}^d$, $A_{SL}$, the width differences
$\Delta\Gamma_{d}$ and $\Delta\Gamma_{s}^{CP}$ and discuss the r\^ole they play
in establishing the limits on New Physics. The present data clearly favour the
SM, with the New Physics favoured region placed around the SM solution. A New
Physics solution significantly different from the SM is still allowed, albeit
quite disfavoured (2.6% probability). We analyse the presently available
indirect knowledge on the phase $\bar\chi$ entering in $B_s^0$--$\bar B_s^0$
mixing and study the impact of a future measurement of $\bar\chi$ to be
achieved at LHC, through the measurement of the time-dependent CP asymmetry in
$B_s\to J/\Psi \Phi$ decays.
| [
{
"created": "Wed, 9 Aug 2006 16:25:08 GMT",
"version": "v1"
},
{
"created": "Mon, 14 Aug 2006 10:57:51 GMT",
"version": "v2"
},
{
"created": "Thu, 11 Jan 2007 16:29:00 GMT",
"version": "v3"
}
] | 2008-11-26 | [
[
"Botella",
"F. J.",
"",
"Valencia U. & Valencia U., IFIC"
],
[
"Branco",
"G. C.",
"",
"Lisbon,\n IST & Munich, Tech. U."
],
[
"Nebot",
"M.",
"",
"Lisbon, IST"
]
] | We analyse present constraints on the SM parameter space and derive, in a model independent way, various bounds on New Physics contributions to $B_d^0$--$\bar B_d^0$ and $B_s^0$--$\bar B_s^0$ mixings. Our analyses include information on a large set of asymmetries, leading to the measurement of the CKM phases $\gamma$ and $\bar\beta$, as well as recent data from D0 and CDF related to the $B_s^0$--$\bar B_s^0$ system such as the measurement of $\Delta M_{B_s}$, $A_{SL}$ and $\Delta\Gamma_{s}^{CP}$. We examine in detail several observables such as the asymmetries $A_{sl}^d$, $A_{SL}$, the width differences $\Delta\Gamma_{d}$ and $\Delta\Gamma_{s}^{CP}$ and discuss the r\^ole they play in establishing the limits on New Physics. The present data clearly favour the SM, with the New Physics favoured region placed around the SM solution. A New Physics solution significantly different from the SM is still allowed, albeit quite disfavoured (2.6% probability). We analyse the presently available indirect knowledge on the phase $\bar\chi$ entering in $B_s^0$--$\bar B_s^0$ mixing and study the impact of a future measurement of $\bar\chi$ to be achieved at LHC, through the measurement of the time-dependent CP asymmetry in $B_s\to J/\Psi \Phi$ decays. |
hep-ph/9902231 | Gert Aarts | Gert Aarts (Utrecht University) and Jan Smit (University of Amsterdam,
Utrecht University) | Dynamics of Fermions and Inhomogeneous Bose Fields on a Real-Time
Lattice | 5 pages, 6 eps figures, talk presented by G. Aarts at Strong and
Electroweak Matter '98, Kopenhagen, Denmark, December 2-5, 1998 | null | null | null | hep-ph hep-lat hep-th | null | The dynamics of the 1+1 abelian Higgs model with fermions is studied in the
large N_f approximation, on a real-time lattice. The Bose fields obey effective
classical equations of motion which include the fermion back reaction. The
dynamics of the quantized fermion field is treated with a mode function
expansion. Numerical results are shown for renormalizability, nonequilibrium
dynamics and the anomalous charge, and Pauli blocking.
| [
{
"created": "Wed, 3 Feb 1999 13:53:42 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Aarts",
"Gert",
"",
"Utrecht University"
],
[
"Smit",
"Jan",
"",
"University of Amsterdam,\n Utrecht University"
]
] | The dynamics of the 1+1 abelian Higgs model with fermions is studied in the large N_f approximation, on a real-time lattice. The Bose fields obey effective classical equations of motion which include the fermion back reaction. The dynamics of the quantized fermion field is treated with a mode function expansion. Numerical results are shown for renormalizability, nonequilibrium dynamics and the anomalous charge, and Pauli blocking. |
hep-ph/0306099 | Kevin L. Haglin | Judith M. Peters and Kevin L. Haglin | Flow Buildup in a Mixed Phase of Quark-Gluon Plasma Plus Hadrons | 4 pages RevTeX, 4 Postscript figures | J.Phys. G31 (2005) 49-56 | 10.1088/0954-3899/31/1/005 | null | hep-ph | null | Transport processes are considered for their abilities to generate flow in a
mixed-phase system of hadrons plus quark-gluon plasma exhibiting temperature
and density gradients. Diffusive mechanisms are found to be the leading
sources. Even after overcoming viscous effects, conductive and diffusive forces
generate flow velocities for pions in a model using kinetic theory to within
fifteen percent of light speed. Since such flow is not observed, this could
possibly rule out the mixed phase in the evolution of high energy heavy ion
collisions.
| [
{
"created": "Thu, 12 Jun 2003 17:28:36 GMT",
"version": "v1"
}
] | 2009-11-10 | [
[
"Peters",
"Judith M.",
""
],
[
"Haglin",
"Kevin L.",
""
]
] | Transport processes are considered for their abilities to generate flow in a mixed-phase system of hadrons plus quark-gluon plasma exhibiting temperature and density gradients. Diffusive mechanisms are found to be the leading sources. Even after overcoming viscous effects, conductive and diffusive forces generate flow velocities for pions in a model using kinetic theory to within fifteen percent of light speed. Since such flow is not observed, this could possibly rule out the mixed phase in the evolution of high energy heavy ion collisions. |
hep-ph/0307332 | Tatsuo Kobayashi | Tatsuo Kobayashi and Osamu Seto | Dilaton and Moduli Fields in D-term inflation | 23 pages, latex, 1 figure | Phys.Rev. D69 (2004) 023510 | 10.1103/PhysRevD.69.023510 | null | hep-ph astro-ph hep-th | null | We investigate the possibility of $D$-term inflation within the framework of
type I string-inspired models. Although $D$-term inflation model has the
excellent property that it is free from the so-called $\eta$- problem, two
serious problems appear when we embed $D$-term inflation in string theory, the
magnitude of FI term and the rolling motion of the dilation. In the present
paper, we analyze the potential of $D$-term inflation in type I inspired models
and study the behavior of dilaton and twisted moduli fields. Adopting the
non-perturbative superpotential induced by gaugino condensation, the twisted
moduli can be stabilized. If the dilaton is in a certain range, it evolves very
slowly and does not run away to infinity. Thus $D$-term dominated vacuum energy
becomes available for driving inflation. By studying the density perturbation
generated by the inflation model, we derive the constraints on model parameters
and give some implications on $D$-term inflation in type I inspired models.
| [
{
"created": "Mon, 28 Jul 2003 02:02:21 GMT",
"version": "v1"
},
{
"created": "Mon, 11 Aug 2003 01:59:09 GMT",
"version": "v2"
}
] | 2009-11-10 | [
[
"Kobayashi",
"Tatsuo",
""
],
[
"Seto",
"Osamu",
""
]
] | We investigate the possibility of $D$-term inflation within the framework of type I string-inspired models. Although $D$-term inflation model has the excellent property that it is free from the so-called $\eta$- problem, two serious problems appear when we embed $D$-term inflation in string theory, the magnitude of FI term and the rolling motion of the dilation. In the present paper, we analyze the potential of $D$-term inflation in type I inspired models and study the behavior of dilaton and twisted moduli fields. Adopting the non-perturbative superpotential induced by gaugino condensation, the twisted moduli can be stabilized. If the dilaton is in a certain range, it evolves very slowly and does not run away to infinity. Thus $D$-term dominated vacuum energy becomes available for driving inflation. By studying the density perturbation generated by the inflation model, we derive the constraints on model parameters and give some implications on $D$-term inflation in type I inspired models. |
hep-ph/9510426 | Takahashi Tomohiko | Nobuhiro Maekawa, Tomohiko Takahashi | Duality of a Supersymmetric Model with the Pati-Salam group | 8 pages, LaTeX, Published version | Prog.Theor.Phys. 95 (1996) 1167-1172 | 10.1143/PTP.95.1167 | KUNS-1367 | hep-ph | null | Recently one of the authors proposed a dual theory of a Supersymmetric
Standard Model (SSM), in which it is naturally understood that at least one
quark (the top quark) should be heavy, i.e., almost the same order as the weak
scale, and the supersymmetric Higgs mass parameter $\mu$ can naturally be
expected to be small. However, the model cannot have Yukawa couplings of the
lepton sector. In this paper, we examine a dual theory of a Supersymmetric
Model with the Pati-Salam gauge group $SU(4)_{PS}\times SU(2)_L\times SU(2)_R $
with respect to the gauge group $SU(4)_{PS}$. In this scenario, Yukawa
couplings of the lepton sector can be induced. In this model the Pati-Salam
breaking scale should be around the SUSY breaking scale.
| [
{
"created": "Fri, 27 Oct 1995 05:40:13 GMT",
"version": "v1"
},
{
"created": "Sat, 28 Oct 1995 05:17:54 GMT",
"version": "v2"
},
{
"created": "Fri, 1 Aug 1997 05:19:36 GMT",
"version": "v3"
}
] | 2009-10-28 | [
[
"Maekawa",
"Nobuhiro",
""
],
[
"Takahashi",
"Tomohiko",
""
]
] | Recently one of the authors proposed a dual theory of a Supersymmetric Standard Model (SSM), in which it is naturally understood that at least one quark (the top quark) should be heavy, i.e., almost the same order as the weak scale, and the supersymmetric Higgs mass parameter $\mu$ can naturally be expected to be small. However, the model cannot have Yukawa couplings of the lepton sector. In this paper, we examine a dual theory of a Supersymmetric Model with the Pati-Salam gauge group $SU(4)_{PS}\times SU(2)_L\times SU(2)_R $ with respect to the gauge group $SU(4)_{PS}$. In this scenario, Yukawa couplings of the lepton sector can be induced. In this model the Pati-Salam breaking scale should be around the SUSY breaking scale. |
1803.02072 | Bin Wu | Aleksi Kurkela, Urs Achim Wiedemann, Bin Wu | Nearly isentropic flow at sizeable $\eta/s$ | 8 pages, 5 figures, minor changes, typos corrected, published version | null | 10.1016/j.physletb.2018.06.064 | CERN-TH-2018-045 | hep-ph hep-ex nucl-ex nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Non-linearities in the harmonic spectra of hadron-nucleus and nucleus-nucleus
collisions provide evidence for the dynamical response to azimuthal spatial
eccentricities. Here, we demonstrate within the framework of transport theory
that even the mildest interaction correction to a picture of free-streaming
particle distributions, namely the inclusion of one perturbatively weak
interaction ("one-hit dynamics"), will generically give rise to all observed
linear and non-linear structures. We further argue that transport theory
naturally accounts within the range of its validity for realistic signal sizes
of the linear and non-linear response coefficients observed in azimuthal
momentum anisotropies with a large mean free path of the order of the system
size in peripheral ($\sim 50 \%$ centrality) PbPb or central pPb collisions.
The shear viscosity to entropy density ratio $\eta/s$ of such a transport
theory is approximately an order of magnitude larger than that of an almost
perfect fluid. The phenomenological success of transport simulations thus
challenges the perfect fluid paradigm of ultra-relativistic nucleus-nucleus and
hadron-nucleus collisions.
| [
{
"created": "Tue, 6 Mar 2018 09:33:14 GMT",
"version": "v1"
},
{
"created": "Tue, 20 Mar 2018 10:57:08 GMT",
"version": "v2"
},
{
"created": "Thu, 10 May 2018 14:40:23 GMT",
"version": "v3"
},
{
"created": "Fri, 6 Jul 2018 12:09:27 GMT",
"version": "v4"
}
] | 2018-07-09 | [
[
"Kurkela",
"Aleksi",
""
],
[
"Wiedemann",
"Urs Achim",
""
],
[
"Wu",
"Bin",
""
]
] | Non-linearities in the harmonic spectra of hadron-nucleus and nucleus-nucleus collisions provide evidence for the dynamical response to azimuthal spatial eccentricities. Here, we demonstrate within the framework of transport theory that even the mildest interaction correction to a picture of free-streaming particle distributions, namely the inclusion of one perturbatively weak interaction ("one-hit dynamics"), will generically give rise to all observed linear and non-linear structures. We further argue that transport theory naturally accounts within the range of its validity for realistic signal sizes of the linear and non-linear response coefficients observed in azimuthal momentum anisotropies with a large mean free path of the order of the system size in peripheral ($\sim 50 \%$ centrality) PbPb or central pPb collisions. The shear viscosity to entropy density ratio $\eta/s$ of such a transport theory is approximately an order of magnitude larger than that of an almost perfect fluid. The phenomenological success of transport simulations thus challenges the perfect fluid paradigm of ultra-relativistic nucleus-nucleus and hadron-nucleus collisions. |
0710.1300 | Anthony Hall | Anthony Hall | Massive Quark-Gluon Scattering Amplitudes at Tree Level | 24 pages, 6 figures | Phys.Rev.D77:025011,2008 | 10.1103/PhysRevD.77.025011 | null | hep-ph | null | Results for four-, five-, and six-parton tree amplitudes for massive
quark-antiquark scattering with gluons are calculated using the recursion
relations of Britto, Cachazo, Feng, and Witten. The required diagrams are
generated using shifts of the momenta of a pair of massless legs to complex
values. Checks verifying the calculations are described, and a simple formula
for the shifted spinors of an internal gluon is presented.
| [
{
"created": "Mon, 8 Oct 2007 07:19:37 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Hall",
"Anthony",
""
]
] | Results for four-, five-, and six-parton tree amplitudes for massive quark-antiquark scattering with gluons are calculated using the recursion relations of Britto, Cachazo, Feng, and Witten. The required diagrams are generated using shifts of the momenta of a pair of massless legs to complex values. Checks verifying the calculations are described, and a simple formula for the shifted spinors of an internal gluon is presented. |
hep-ph/0702154 | Sergey Gevorkyan | S.R.Gevorkyan, D.T.Madigozhin, A.V.Tarasov, O.O.Voskresenskaya | Electromagnetic effects and scattering lengths extraction from
experimental data on $K \to 3\pi$ decays | 5 pages | Phys.Part.Nucl.Lett.5:85-87,2008 | 10.1007/s11497-008-2004-8 | null | hep-ph | null | The final state interactions in $K^\pm\to\pi^\pm\pi^0\pi^0$ decays are
considered using the methods of non-relativistic quantum mechanics. We show how
to take into account the largest electromagnetic effects in the analysis of
experimental data, using the amplitudes calculated earlier. We propose the
relevant expressions for amplitude corrections valid both above and below the
two charged pion production threshold $M_{\pi^0\pi^0}=2m_{\pi^\pm}$, including
the average effect for the threshold bin. These formulae can be used in the
procedure of pion scattering lengths measurement from $M_{\pi^0\pi^0}$
spectrum.
| [
{
"created": "Thu, 15 Feb 2007 11:24:17 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Gevorkyan",
"S. R.",
""
],
[
"Madigozhin",
"D. T.",
""
],
[
"Tarasov",
"A. V.",
""
],
[
"Voskresenskaya",
"O. O.",
""
]
] | The final state interactions in $K^\pm\to\pi^\pm\pi^0\pi^0$ decays are considered using the methods of non-relativistic quantum mechanics. We show how to take into account the largest electromagnetic effects in the analysis of experimental data, using the amplitudes calculated earlier. We propose the relevant expressions for amplitude corrections valid both above and below the two charged pion production threshold $M_{\pi^0\pi^0}=2m_{\pi^\pm}$, including the average effect for the threshold bin. These formulae can be used in the procedure of pion scattering lengths measurement from $M_{\pi^0\pi^0}$ spectrum. |
hep-ph/0606271 | Zack Sullivan | Zack Sullivan and Edmond L. Berger | Missing heavy flavor backgrounds to Higgs boson production | 23 pgs., 10 figs, revtex4, 1 Ref. added, minor typos corrected, to
appear in Phys. Rev. D | Phys.Rev.D74:033008,2006 | 10.1103/PhysRevD.74.033008 | ANL-HEP-PR-06-46 | hep-ph hep-ex | null | We investigate characteristics of the signal and backgrounds for Higgs boson
decay into WW at the Fermilab Tevatron and CERN Large Hadron Collider. In the
the lepton-pair-plus-missing-energy final state, we show that the background
receives an important contribution from semileptonic decays of heavy flavors.
Lepton isolation cuts provide too little suppression of these heavy flavor
contributions, and an additional 4 to 8 orders-of-magnitude suppression must
come from physics cuts. We demonstrate that an increase of the minimum
transverse momentum of nonleading leptons in multilepton events is one
effective way to achieve the needed suppression, without appreciable loss of
the Higgs boson signal. Such a cut would impact the efficiency of searches for
supersymmetry as well. We emphasize the importance of direct measurement of the
lepton background from heavy flavor production.
| [
{
"created": "Mon, 26 Jun 2006 20:20:03 GMT",
"version": "v1"
},
{
"created": "Fri, 4 Aug 2006 15:04:16 GMT",
"version": "v2"
}
] | 2008-11-26 | [
[
"Sullivan",
"Zack",
""
],
[
"Berger",
"Edmond L.",
""
]
] | We investigate characteristics of the signal and backgrounds for Higgs boson decay into WW at the Fermilab Tevatron and CERN Large Hadron Collider. In the the lepton-pair-plus-missing-energy final state, we show that the background receives an important contribution from semileptonic decays of heavy flavors. Lepton isolation cuts provide too little suppression of these heavy flavor contributions, and an additional 4 to 8 orders-of-magnitude suppression must come from physics cuts. We demonstrate that an increase of the minimum transverse momentum of nonleading leptons in multilepton events is one effective way to achieve the needed suppression, without appreciable loss of the Higgs boson signal. Such a cut would impact the efficiency of searches for supersymmetry as well. We emphasize the importance of direct measurement of the lepton background from heavy flavor production. |
1411.0817 | Harleen Dahiya Dr. | Narinder Kumar and Harleen Dahiya | Charge and magnetization densities in transverse coordinate and impact
parameter space | 18 pages, 5 figures. To appear in Phys. Rev. D | Phys. Rev. D 90, (2014) 094030 | 10.1103/PhysRevD.90.094030 | null | hep-ph nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Electromagnetic form factors obtained from the overlap of light front wave
functions (LFWFs) have been used to study the transverse densities of charge
and magnetization. The calculations have been carried out to develop a relation
between the charge distribution of the quarks inside nucleon in the transverse
coordinate space as well as in the impact parameter space. When a comparison is
carried out, it is found that the transverse distribution in the impact
parameter space, where the longitudinal momentum fraction $x$ can be fixed,
falls off faster than the spatial distribution in the transverse coordinate
space where there is some contribution from the longitudinal momentum as well.
The anomalous magnetization density of the nucleon has also been discussed.
Further, we have also presented the results of the QCD transverse AdS charge
density inspired from the holographic QCD model.
| [
{
"created": "Tue, 4 Nov 2014 07:52:45 GMT",
"version": "v1"
}
] | 2015-06-23 | [
[
"Kumar",
"Narinder",
""
],
[
"Dahiya",
"Harleen",
""
]
] | Electromagnetic form factors obtained from the overlap of light front wave functions (LFWFs) have been used to study the transverse densities of charge and magnetization. The calculations have been carried out to develop a relation between the charge distribution of the quarks inside nucleon in the transverse coordinate space as well as in the impact parameter space. When a comparison is carried out, it is found that the transverse distribution in the impact parameter space, where the longitudinal momentum fraction $x$ can be fixed, falls off faster than the spatial distribution in the transverse coordinate space where there is some contribution from the longitudinal momentum as well. The anomalous magnetization density of the nucleon has also been discussed. Further, we have also presented the results of the QCD transverse AdS charge density inspired from the holographic QCD model. |
1610.02564 | Adriano Doff S. Gomes | A. Doff and A. A. Natale | Anomalous mass dimension of multi-flavor QCD | 12 pages, 2 tables | null | 10.1103/PhysRevD.94.076005 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Models of strongly interacting theories with a large mass anomalous dimension
($\gamma_m$) provide an interesting possibility for the dynamical origin of the
electroweak symmetry breaking. A laboratory for these models is QCD with many
flavors, which may present a non-trivial fixed point associated to a conformal
region. Studies based on conformal field theories and on Schwinger-Dyson
equations have suggested the existence of bounds on the mass anomalous
dimension at the fixed points of these models. In this note we discuss
$\gamma_m$ values of multi-flavor QCD exhibiting a non-trivial fixed point and
affected by relevant four-fermion interactions.
| [
{
"created": "Sat, 8 Oct 2016 19:02:32 GMT",
"version": "v1"
}
] | 2016-11-23 | [
[
"Doff",
"A.",
""
],
[
"Natale",
"A. A.",
""
]
] | Models of strongly interacting theories with a large mass anomalous dimension ($\gamma_m$) provide an interesting possibility for the dynamical origin of the electroweak symmetry breaking. A laboratory for these models is QCD with many flavors, which may present a non-trivial fixed point associated to a conformal region. Studies based on conformal field theories and on Schwinger-Dyson equations have suggested the existence of bounds on the mass anomalous dimension at the fixed points of these models. In this note we discuss $\gamma_m$ values of multi-flavor QCD exhibiting a non-trivial fixed point and affected by relevant four-fermion interactions. |
hep-ph/0104070 | Nikolay Kochelev | N.I. Kochelev and V.Vento | Evidence for the flavor singlet axial anomaly related effects in $\phi$
meson electromagnetic production at large momentum transfers | 13 pages, 6 figures, Latex; final version to appear in Phys. Lett.B | null | 10.1016/S0370-2693(01)00894-2 | null | hep-ph hep-ex nucl-th | null | The gluonic contributions to the conventional PCAC formulas due to flavor
singlet axial anomaly have been instrumental in explaining the mass of the
$\eta^{\prime}$ and providing a plausible explanation for solving the spin
crisis. We show that they also play an important role in the description of
photo- and electroproduction of vector mesons at low energy and high momentum
transfers. We calculate the contributions of this type to $\phi$ meson
electromagnetic production in a model, which contains also a soft pomeron, and
find agreement with recent CLAS data.
| [
{
"created": "Fri, 6 Apr 2001 17:18:43 GMT",
"version": "v1"
},
{
"created": "Sat, 7 Apr 2001 15:07:02 GMT",
"version": "v2"
},
{
"created": "Sat, 14 Jul 2001 07:55:52 GMT",
"version": "v3"
}
] | 2009-11-07 | [
[
"Kochelev",
"N. I.",
""
],
[
"Vento",
"V.",
""
]
] | The gluonic contributions to the conventional PCAC formulas due to flavor singlet axial anomaly have been instrumental in explaining the mass of the $\eta^{\prime}$ and providing a plausible explanation for solving the spin crisis. We show that they also play an important role in the description of photo- and electroproduction of vector mesons at low energy and high momentum transfers. We calculate the contributions of this type to $\phi$ meson electromagnetic production in a model, which contains also a soft pomeron, and find agreement with recent CLAS data. |
1712.05366 | Christian Hohl | Stefan Antusch, Christian Hohl, Steve F. King and Vasja Susic | Non-universal Z' from SO(10) GUTs with vector-like family and the origin
of neutrino masses | Revised version, published in NPB. New material, general conclusions
unchanged. 30 pages, 4 figures, 2 tables | null | 10.1016/j.nuclphysb.2018.07.022 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A $Z'$ gauge boson with mass around the (few) TeV scale is a popular example
of physics beyond the Standard Model (SM) and can be a fascinating remnant of a
Grand Unified Theory (GUT). Recently, $Z'$ models with non-universal couplings
to the SM fermions due to extra vector-like states have received attention as
potential explanations of the present $R_K$, $R_{K^{\ast}}$ anomalies; this
includes GUT model proposals based on the $\mathrm{SO}(10)$ group. In this
paper we further develop GUT models with a flavour non-universal low scale $Z'$
and clarify several outstanding issues within them. First, we successfully
incorporate a realistic neutrino sector (with linear and/or inverse low scale
seesaw mechanism), which was so far a missing ingredient. Second, we
investigate in detail their compatibility with the $R_K$, $R_{K^{\ast}}$
anomalies; we find that the anomalies do not have a consistent explanation
within such models. Third, we demonstrate that these models have other
compelling phenomenological features; we study the correlations between the
flavour violating processes of $\mu\to 3e$ and $\mu$-$e$ conversion in a muonic
atom, showing how a GUT imprint could manifest itself in experiments.
| [
{
"created": "Thu, 14 Dec 2017 17:52:46 GMT",
"version": "v1"
},
{
"created": "Wed, 15 Aug 2018 09:57:29 GMT",
"version": "v2"
}
] | 2018-09-26 | [
[
"Antusch",
"Stefan",
""
],
[
"Hohl",
"Christian",
""
],
[
"King",
"Steve F.",
""
],
[
"Susic",
"Vasja",
""
]
] | A $Z'$ gauge boson with mass around the (few) TeV scale is a popular example of physics beyond the Standard Model (SM) and can be a fascinating remnant of a Grand Unified Theory (GUT). Recently, $Z'$ models with non-universal couplings to the SM fermions due to extra vector-like states have received attention as potential explanations of the present $R_K$, $R_{K^{\ast}}$ anomalies; this includes GUT model proposals based on the $\mathrm{SO}(10)$ group. In this paper we further develop GUT models with a flavour non-universal low scale $Z'$ and clarify several outstanding issues within them. First, we successfully incorporate a realistic neutrino sector (with linear and/or inverse low scale seesaw mechanism), which was so far a missing ingredient. Second, we investigate in detail their compatibility with the $R_K$, $R_{K^{\ast}}$ anomalies; we find that the anomalies do not have a consistent explanation within such models. Third, we demonstrate that these models have other compelling phenomenological features; we study the correlations between the flavour violating processes of $\mu\to 3e$ and $\mu$-$e$ conversion in a muonic atom, showing how a GUT imprint could manifest itself in experiments. |
hep-ph/0508197 | Michael Buballa | Michael Buballa and Igor A. Shovkovy | A note on color neutrality in NJL-type models | 4 pages, no figure; v2: minor clarifications, references added | Phys.Rev. D72 (2005) 097501 | 10.1103/PhysRevD.72.097501 | null | hep-ph nucl-th | null | By referring to the underlying physics behind the color charge neutrality
condition in quark matter, we discuss how this condition should be properly
imposed in NJL-type models in a phenomenologically meaningful way. In
particular, we show that the standard assumption regarding the use of two color
chemical potentials, chosen in a very special way, is not justified in general.
When used uncritically, such an approach leads to wrong or unphysical
conclusions.
| [
{
"created": "Thu, 18 Aug 2005 15:50:56 GMT",
"version": "v1"
},
{
"created": "Fri, 2 Sep 2005 13:38:34 GMT",
"version": "v2"
}
] | 2009-11-11 | [
[
"Buballa",
"Michael",
""
],
[
"Shovkovy",
"Igor A.",
""
]
] | By referring to the underlying physics behind the color charge neutrality condition in quark matter, we discuss how this condition should be properly imposed in NJL-type models in a phenomenologically meaningful way. In particular, we show that the standard assumption regarding the use of two color chemical potentials, chosen in a very special way, is not justified in general. When used uncritically, such an approach leads to wrong or unphysical conclusions. |
0812.4917 | Anatoly Kotikov | A.Yu. Illarionov, A.V. Kotikov | Small-X Behavior of Parton Densities at Low Q2 Values | 6 pages, 2 figures, in Proc. of XIX International Baldin Seminar
"Relativistic Nuclear Physics and Quantum Chromodynamics" | null | null | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In the leading twist approximation of the Wilson operator product expansion
with standard and "frozen" versions of strong copling constant we show that the
Bessel-inspired behavior of the structure function $F_2$ at small $x$, obtained
for a flat initial condition in the DGLAP evolution, leads to very good
agreement with the deep inelastic scattering experimental data from HERA.
| [
{
"created": "Mon, 29 Dec 2008 17:01:20 GMT",
"version": "v1"
}
] | 2008-12-31 | [
[
"Illarionov",
"A. Yu.",
""
],
[
"Kotikov",
"A. V.",
""
]
] | In the leading twist approximation of the Wilson operator product expansion with standard and "frozen" versions of strong copling constant we show that the Bessel-inspired behavior of the structure function $F_2$ at small $x$, obtained for a flat initial condition in the DGLAP evolution, leads to very good agreement with the deep inelastic scattering experimental data from HERA. |
hep-ph/9711419 | Doreen Wackeroth | W. Hollik, C. Kao, W.M. Moesle, and D. Wackeroth | MSSM Radiative Corrections to the Top Pair Production Processes at
Hadron Colliders | 7 pages, 6 postscript figures (epsf), RevTeX. Contribution to the
proceedings of the 'International Workshop on Quantum Effects in the MSSM',
Barcelona, Spain, September 9-13, 1997, World Scientific, ed. J. Sola | null | null | null | hep-ph | null | We calculate the MSSM $O(\alpha)$ corrections to the main production
processes of strong top pair production at the upgraded Tevatron and at the
LHC. In exploring the potential of future hadron colliders for performing
electroweak precision physics we study their effects on the total hadronic
cross sections, the invariant $t\bar t$ mass distributions and give first
results for parity violating asymmetries in the production of left and right
handed top quarks.
| [
{
"created": "Fri, 21 Nov 1997 13:26:55 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Hollik",
"W.",
""
],
[
"Kao",
"C.",
""
],
[
"Moesle",
"W. M.",
""
],
[
"Wackeroth",
"D.",
""
]
] | We calculate the MSSM $O(\alpha)$ corrections to the main production processes of strong top pair production at the upgraded Tevatron and at the LHC. In exploring the potential of future hadron colliders for performing electroweak precision physics we study their effects on the total hadronic cross sections, the invariant $t\bar t$ mass distributions and give first results for parity violating asymmetries in the production of left and right handed top quarks. |
0709.3434 | Jiunn-Wei Chen | Jiunn-Wei Chen, Mei Huang, Yen-Han Li, Eiji Nakano, Di-Lun Yang | Phase Transitions and the Perfectness of Fluids | 5 pages, 2 figures; Fig. 2 changed; journal version | Phys.Lett.B670:18-21,2008 | 10.1016/j.physletb.2008.10.024 | MIT-CTP 3869 | hep-ph cond-mat.other cond-mat.soft hep-lat nucl-ex nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We calculate the ratio eta/s, the shear viscosity (eta) to entropy density
(s), which characterizes how perfect a fluid is, in weakly coupled real scalar
field theories with different types of phase transitions. The mean-field
results of the eta/s behaviors agree with the empirical observations in atomic
and molecular systems such as water, He, N, and all the matters with data
available in the NIST database. These behaviors are expected to be the same in
N component scalar theories with an O(N) symmetry. We speculate these eta/s
behaviors are general properties of fluid shared by QCD and cold atoms.
Finally, we clarify some issues regarding counterexamples of the conjectured
universal eta/s bound found in Refs.[16,17].
| [
{
"created": "Fri, 21 Sep 2007 13:28:45 GMT",
"version": "v1"
},
{
"created": "Fri, 28 Sep 2007 15:14:48 GMT",
"version": "v2"
},
{
"created": "Fri, 25 Jul 2008 03:41:22 GMT",
"version": "v3"
},
{
"created": "Sat, 11 Oct 2008 13:55:35 GMT",
"version": "v4"
}
] | 2009-01-01 | [
[
"Chen",
"Jiunn-Wei",
""
],
[
"Huang",
"Mei",
""
],
[
"Li",
"Yen-Han",
""
],
[
"Nakano",
"Eiji",
""
],
[
"Yang",
"Di-Lun",
""
]
] | We calculate the ratio eta/s, the shear viscosity (eta) to entropy density (s), which characterizes how perfect a fluid is, in weakly coupled real scalar field theories with different types of phase transitions. The mean-field results of the eta/s behaviors agree with the empirical observations in atomic and molecular systems such as water, He, N, and all the matters with data available in the NIST database. These behaviors are expected to be the same in N component scalar theories with an O(N) symmetry. We speculate these eta/s behaviors are general properties of fluid shared by QCD and cold atoms. Finally, we clarify some issues regarding counterexamples of the conjectured universal eta/s bound found in Refs.[16,17]. |
1405.2828 | Yao Ji | Yao Ji, A.V. Belitsky | Renormalization of twist-four operators in light-cone gauge | 58 pages, 16 figures; dedicated to the memory of Eduard A. Kuraev | null | 10.1016/j.nuclphysb.2015.03.002 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We compute one-loop renormalization group equations for non-singlet
twist-four operators in QCD. The calculation heavily relies on the light-cone
gauge formalism in the momentum fraction space that essentially rephrases the
analysis of all two-to two and two-to-three transition kernels to purely
algebraic manipulations both for non- and quasipartonic operators. This is the
first brute force calculation of this sector available in the literature.
Fourier transforming our findings to the coordinate space, we checked them
against available results obtained within a conformal symmetry-based formalism
that bypasses explicit diagrammatic calculations and confirmed agreement with
the latter.
| [
{
"created": "Mon, 12 May 2014 16:35:24 GMT",
"version": "v1"
}
] | 2015-06-19 | [
[
"Ji",
"Yao",
""
],
[
"Belitsky",
"A. V.",
""
]
] | We compute one-loop renormalization group equations for non-singlet twist-four operators in QCD. The calculation heavily relies on the light-cone gauge formalism in the momentum fraction space that essentially rephrases the analysis of all two-to two and two-to-three transition kernels to purely algebraic manipulations both for non- and quasipartonic operators. This is the first brute force calculation of this sector available in the literature. Fourier transforming our findings to the coordinate space, we checked them against available results obtained within a conformal symmetry-based formalism that bypasses explicit diagrammatic calculations and confirmed agreement with the latter. |
hep-ph/9806269 | Ken Williams | K. Williams | The minimum area, the flux tube, and Thomas precession | Latex, 13 pages | Phys.Rev.D59:115002,1999 | 10.1103/PhysRevD.59.115002 | null | hep-ph | null | Quark confinement in Buchm\"{u}ller's picture of a rotating flux tube is
reconsidered in the context of a minimum area evaluation of the Wilson loop.
The question is asked whether resulting spin independent dynamics are
consistent with Thomas precessional spin dependence leading from electric
confinement. The answer appears to be in the negative; self-consistency of the
picture found in the literature is examined and explained in simple classical
terms, with illustrations.
| [
{
"created": "Fri, 5 Jun 1998 02:20:28 GMT",
"version": "v1"
},
{
"created": "Mon, 8 Jun 1998 01:11:16 GMT",
"version": "v2"
}
] | 2010-11-19 | [
[
"Williams",
"K.",
""
]
] | Quark confinement in Buchm\"{u}ller's picture of a rotating flux tube is reconsidered in the context of a minimum area evaluation of the Wilson loop. The question is asked whether resulting spin independent dynamics are consistent with Thomas precessional spin dependence leading from electric confinement. The answer appears to be in the negative; self-consistency of the picture found in the literature is examined and explained in simple classical terms, with illustrations. |
hep-ph/0007217 | Andrzej Czarnecki | Andrzej Czarnecki, Kirill Melnikov, and Alexander Yelkhovsky | Anomalous magnetic moment of a bound electron | 9 pages, Revtex | Phys.Rev. A63 (2001) 012509 | 10.1103/PhysRevA.63.012509 | BNL-HET-00/24, SLAC-PUB-8522 | hep-ph | null | We study binding corrections to the gyromagnetic factor g_e of an electron in
hydrogen-like ions. We argue that the leading order binding effects in
radiative corrections Delta g_rad are universal to all orders in alpha/pi and
the complete result reads Delta g_rad = (g_free - 2) [1+(Z alpha)^2/6] +
O[alpha/pi (Zalpha)^4]. The theoretical uncertainty in the prediction for the
experimentally interesting carbon ion is decreased by a factor of about 3.
| [
{
"created": "Thu, 20 Jul 2000 01:45:36 GMT",
"version": "v1"
}
] | 2009-10-31 | [
[
"Czarnecki",
"Andrzej",
""
],
[
"Melnikov",
"Kirill",
""
],
[
"Yelkhovsky",
"Alexander",
""
]
] | We study binding corrections to the gyromagnetic factor g_e of an electron in hydrogen-like ions. We argue that the leading order binding effects in radiative corrections Delta g_rad are universal to all orders in alpha/pi and the complete result reads Delta g_rad = (g_free - 2) [1+(Z alpha)^2/6] + O[alpha/pi (Zalpha)^4]. The theoretical uncertainty in the prediction for the experimentally interesting carbon ion is decreased by a factor of about 3. |
hep-ph/0609101 | Jens Vigen | C. Lourenco and H. K. Wohri | Heavy Flavour Hadro-Production from Fixed-Target to Collider Energies | 72 pages | Phys.Rept.433:127-180,2006 | 10.1016/j.physrep.2006.05.005 | CERN-PH-EP-2006-013-rev | hep-ph hep-ex nucl-ex | null | We review the hadro-production data presently available on open charm and
beauty absolute production cross-sections, collected by experiments at CERN,
DESY and Fermilab. The published charm production cross-section values are
updated, in particular for the "time evolution" of the branching ratios. These
measurements are compared to LO pQCD calculations, as a function of the
collision energy, using recent parametrisations of the parton distribution
functions. We then estimate, including nuclear effects of the parton densities,
the charm and beauty production cross-sections relevant for measurements at SPS
and RHIC energies, in proton-proton, proton-nucleus and nucleus-nucleus
collisions. The calculations are also compared with measurements of single D
and B kinematical distributions, and DDbar pair correlations. We finish with
two brief comments, concerning the importance of beauty production as a
feed-down source of J/psi production, and open charm measurements performed
using leptonic decays.
| [
{
"created": "Mon, 11 Sep 2006 16:30:03 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Lourenco",
"C.",
""
],
[
"Wohri",
"H. K.",
""
]
] | We review the hadro-production data presently available on open charm and beauty absolute production cross-sections, collected by experiments at CERN, DESY and Fermilab. The published charm production cross-section values are updated, in particular for the "time evolution" of the branching ratios. These measurements are compared to LO pQCD calculations, as a function of the collision energy, using recent parametrisations of the parton distribution functions. We then estimate, including nuclear effects of the parton densities, the charm and beauty production cross-sections relevant for measurements at SPS and RHIC energies, in proton-proton, proton-nucleus and nucleus-nucleus collisions. The calculations are also compared with measurements of single D and B kinematical distributions, and DDbar pair correlations. We finish with two brief comments, concerning the importance of beauty production as a feed-down source of J/psi production, and open charm measurements performed using leptonic decays. |
1108.0004 | Goran Senjanovic | Manimala Mitra, Goran Senjanovic, Francesco Vissani | Neutrinoless Double Beta Decay and Heavy Sterile Neutrinos | Version published in NPB. More discussion of the 10 GeV bound,
references added | Nucl.Phys. B856 (2012) 26-73 | 10.1016/j.nuclphysb.2011.10.035 | null | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The experimental rate of neutrinoless double beta decay can be saturated by
the exchange of virtual sterile neutrinos, that mix with the ordinary neutrinos
and are heavier than 200 MeV. Interestingly, this hypothesis is subject only to
marginal experimental constraints, because of the new nuclear matrix elements.
This possibility is analyzed in the context of the Type I seesaw model,
performing also exploratory investigations of the implications for heavy
neutrino mass spectra, rare decays of mesons as well as neutrino-decay search,
LHC, and lepton flavor violation. The heavy sterile neutrinos can saturate the
rate only when their masses are below some 10 TeV, but in this case, the
suppression of the light-neutrino masses has to be more than the ratio of the
electroweak scale and the heavy-neutrino scale; i.e., more suppressed than the
naive seesaw expectation. We classify the cases when this condition holds true
in the minimal version of the seesaw model, showing its compatibility (1) with
neutrinoless double beta rate being dominated by heavy neutrinos and (2) with
any light neutrino mass spectra. The absence of excessive fine-tunings and the
radiative stability of light neutrino mass matrices, together with a saturating
sterile neutrino contribution, imply an upper bound on the heavy neutrino
masses of about 10 GeV. We extend our analysis to the Extended seesaw scenario,
where the light and the heavy sterile neutrino contributions are completely
decoupled, allowing the sterile neutrinos to saturate the present experimental
bound on neutrinoless double beta decay. In the models analyzed, the rate of
this process is not strictly connected with the values of the light neutrino
masses, and a fast transition rate is compatible with neutrinos lighter than
100 meV.
| [
{
"created": "Fri, 29 Jul 2011 20:00:11 GMT",
"version": "v1"
},
{
"created": "Wed, 21 Dec 2011 22:14:58 GMT",
"version": "v2"
}
] | 2015-05-30 | [
[
"Mitra",
"Manimala",
""
],
[
"Senjanovic",
"Goran",
""
],
[
"Vissani",
"Francesco",
""
]
] | The experimental rate of neutrinoless double beta decay can be saturated by the exchange of virtual sterile neutrinos, that mix with the ordinary neutrinos and are heavier than 200 MeV. Interestingly, this hypothesis is subject only to marginal experimental constraints, because of the new nuclear matrix elements. This possibility is analyzed in the context of the Type I seesaw model, performing also exploratory investigations of the implications for heavy neutrino mass spectra, rare decays of mesons as well as neutrino-decay search, LHC, and lepton flavor violation. The heavy sterile neutrinos can saturate the rate only when their masses are below some 10 TeV, but in this case, the suppression of the light-neutrino masses has to be more than the ratio of the electroweak scale and the heavy-neutrino scale; i.e., more suppressed than the naive seesaw expectation. We classify the cases when this condition holds true in the minimal version of the seesaw model, showing its compatibility (1) with neutrinoless double beta rate being dominated by heavy neutrinos and (2) with any light neutrino mass spectra. The absence of excessive fine-tunings and the radiative stability of light neutrino mass matrices, together with a saturating sterile neutrino contribution, imply an upper bound on the heavy neutrino masses of about 10 GeV. We extend our analysis to the Extended seesaw scenario, where the light and the heavy sterile neutrino contributions are completely decoupled, allowing the sterile neutrinos to saturate the present experimental bound on neutrinoless double beta decay. In the models analyzed, the rate of this process is not strictly connected with the values of the light neutrino masses, and a fast transition rate is compatible with neutrinos lighter than 100 meV. |
hep-ph/0002277 | Francesco Sannino | F. Sannino (Yale University) | A Note on Anomaly Matching for Finite Density QCD | 11 pages, RevTex format, references added. To appear in Phys. Lett. B | Phys.Lett.B480:280-286,2000 | 10.1016/S0370-2693(00)00395-6 | YCTP-P-02-00 | hep-ph hep-th nucl-th | null | We note that the QCD phases at large finite density respect 't Hooft anomaly
matching conditions. Specifically the spectrum of the light excitations
possesses the correct quantum numbers required to obey global anomaly
constraints. We argue that 't Hooft constraints can be used at finite density
along with non perturbative methods to help selecting the correct phase.
| [
{
"created": "Fri, 25 Feb 2000 20:04:23 GMT",
"version": "v1"
},
{
"created": "Tue, 29 Feb 2000 07:38:02 GMT",
"version": "v2"
},
{
"created": "Wed, 22 Mar 2000 16:36:11 GMT",
"version": "v3"
}
] | 2008-11-26 | [
[
"Sannino",
"F.",
"",
"Yale University"
]
] | We note that the QCD phases at large finite density respect 't Hooft anomaly matching conditions. Specifically the spectrum of the light excitations possesses the correct quantum numbers required to obey global anomaly constraints. We argue that 't Hooft constraints can be used at finite density along with non perturbative methods to help selecting the correct phase. |
1401.7464 | Rupa Chatterjee | Rupa Chatterjee, Dinesh K. Srivastava, and Thorsten Renk | Triangular flow of thermal photons from an event-by-event hydrodynamic
model for 2.76A TeV Pb+Pb collisions at LHC | 6 pages, 5 figures | Phys. Rev. C 94, 014903 (2016) | 10.1103/PhysRevC.94.014903 | null | hep-ph nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We calculate the triangular flow parameter $v_3$ of thermal photons from an
event-by-event ideal hydrodynamic model for $0--40\%$ central collisions of Pb
nuclei at $\sqrt{s_{NN}}$=2.76 TeV at LHC. $v_3$ determined with respect to the
participant plane (PP) is found to be non-zero, positive and its $p_T$
dependence is qualitatively similar to the elliptic flow parameter $v_2$(PP) of
thermal photons in the range $1 \le p_T \le 6$ GeV/$c$. In the range $p_T \,
\le $ 3 GeV/$c$, $v_3$(PP) is found to be about $50--75\%$ of $v_2$(PP) and for
$p_T \, >$ 3 GeV/$c$ the two anisotropy parameters become comparable. The local
fluctuations in the initial density distribution as well as the initial global
geometry of the produced matter in the event-by-event hydrodynamic framework
are responsible for this substantial value of $v_3({\rm PP})$. However, as
expected, the triangular flow parameter calculated with respect to the reaction
plane $v_3$(RP) is found to be close to zero. We show that $v_3$(PP) strongly
depends on the value of the fluctuation size scale $\sigma$ especially in the
higher $p_T \, (\ge 3 {\rm GeV}/c)$ region where a larger value of $\sigma$
results in a smaller $v_3({\rm PP})$. In addition, the $v_3{\rm (PP)}$ is found
to increase with the assumed formation time of the thermalized system.
| [
{
"created": "Wed, 29 Jan 2014 10:43:39 GMT",
"version": "v1"
}
] | 2016-07-13 | [
[
"Chatterjee",
"Rupa",
""
],
[
"Srivastava",
"Dinesh K.",
""
],
[
"Renk",
"Thorsten",
""
]
] | We calculate the triangular flow parameter $v_3$ of thermal photons from an event-by-event ideal hydrodynamic model for $0--40\%$ central collisions of Pb nuclei at $\sqrt{s_{NN}}$=2.76 TeV at LHC. $v_3$ determined with respect to the participant plane (PP) is found to be non-zero, positive and its $p_T$ dependence is qualitatively similar to the elliptic flow parameter $v_2$(PP) of thermal photons in the range $1 \le p_T \le 6$ GeV/$c$. In the range $p_T \, \le $ 3 GeV/$c$, $v_3$(PP) is found to be about $50--75\%$ of $v_2$(PP) and for $p_T \, >$ 3 GeV/$c$ the two anisotropy parameters become comparable. The local fluctuations in the initial density distribution as well as the initial global geometry of the produced matter in the event-by-event hydrodynamic framework are responsible for this substantial value of $v_3({\rm PP})$. However, as expected, the triangular flow parameter calculated with respect to the reaction plane $v_3$(RP) is found to be close to zero. We show that $v_3$(PP) strongly depends on the value of the fluctuation size scale $\sigma$ especially in the higher $p_T \, (\ge 3 {\rm GeV}/c)$ region where a larger value of $\sigma$ results in a smaller $v_3({\rm PP})$. In addition, the $v_3{\rm (PP)}$ is found to increase with the assumed formation time of the thermalized system. |
hep-ph/0103295 | Chernyak | Victor Chernyak | Has the E791 experiment measured the pion wave function profile ? | additional explanations inserted, the overall normalization corrected | Phys.Lett. B516 (2001) 116-122 | 10.1016/S0370-2693(01)00849-8 | null | hep-ph hep-ex | null | The cross section of hard diffractive dissociation of the pion into two jets
is calculated. It is obtained that the distribution of longitudinal momenta for
jets is not simply proportional to the profile of the pion wave function, but
depends on it in a complicated way.
In particular, it is shown that, under the conditions of the E791 experiment,
the momentum distribution of jets is similar in its shape for the asymptotic
and CZ wave functions, and even the ratio of the differential cross sections is
not far from unity.
| [
{
"created": "Wed, 28 Mar 2001 14:20:02 GMT",
"version": "v1"
},
{
"created": "Tue, 3 Apr 2001 10:06:50 GMT",
"version": "v2"
},
{
"created": "Wed, 13 Jun 2001 09:38:21 GMT",
"version": "v3"
}
] | 2009-11-07 | [
[
"Chernyak",
"Victor",
""
]
] | The cross section of hard diffractive dissociation of the pion into two jets is calculated. It is obtained that the distribution of longitudinal momenta for jets is not simply proportional to the profile of the pion wave function, but depends on it in a complicated way. In particular, it is shown that, under the conditions of the E791 experiment, the momentum distribution of jets is similar in its shape for the asymptotic and CZ wave functions, and even the ratio of the differential cross sections is not far from unity. |
0812.3987 | Grigoris Panotopoulos | Grigoris Panotopoulos | Supersymmetric dark matter, catalyzed BBN, and heavy moduli in mSUGRA
with gravitino LSP and stau NLSP | 11 pages, 3 figures | Phys.Lett.B671:327-330,2009 | 10.1016/j.physletb.2008.12.047 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In mSUGRA model we assume that gravitino, the LSP, plays the role of cold
dark matter in the universe, while the lightest stau, the NLSP, catalyzes
primordial BBN reconciling the discrepancy between theory and observations. We
have taken into account all gravitino production mechanisms, namely decay from
heavy scalar fields, decay from the NLSP, and from the thermal bath. We find
that the dark matter constraint is incompatible with the lower bound on the
reheating temperature
| [
{
"created": "Sat, 20 Dec 2008 17:54:00 GMT",
"version": "v1"
}
] | 2010-04-15 | [
[
"Panotopoulos",
"Grigoris",
""
]
] | In mSUGRA model we assume that gravitino, the LSP, plays the role of cold dark matter in the universe, while the lightest stau, the NLSP, catalyzes primordial BBN reconciling the discrepancy between theory and observations. We have taken into account all gravitino production mechanisms, namely decay from heavy scalar fields, decay from the NLSP, and from the thermal bath. We find that the dark matter constraint is incompatible with the lower bound on the reheating temperature |
1304.0293 | Satoshi Iso | Satoshi Iso | What can we learn from the 126 GeV Higgs boson for the Planck scale
physics ? - Hierarchy problem and the stability of the vacuum - | Talk given at SCGT12 (Nagoya) and HPNP2013 (Toyama) | null | 10.1142/9789814566254_0025 | KEK-TH-1616 | hep-ph | http://creativecommons.org/licenses/by/3.0/ | The discovery of the Higgs particle at around 126 GeV has given us a big hint
towards the origin of the Higgs potential. The running quartic self-coupling
decreases and crosses zero somewhere in the very high energy scale. It is
usually considered as a signal of the instability of the standard model (SM)
vacuum, but it can also indicate a link between the physics in the electroweak
scale and the Planck scale. Furthermore, the LHC experiments as well as the
flavor physics experiments give strong constraints on the physics beyond the
SM. It urges us to reconsider the widely taken approach to the physics beyond
the SM (BSM), namely the approach based on the gauge unification below the
Planck scale and the resulting hierarchy problem. Motivated by the recent
experiments, we first revisit the hierarchy problem and consider an alternative
appoach based on a classical conformality of the SM without the Higgs mass
term.
In this talk, I review our recent proposal of a B-L extension of the SM with
a flat Higgs potential at the Planck scale. This model can be an alternative
solution to the hierarchy problem as well as being phenomenologically viable to
explain the neutrino oscillations and the baryon asymmetry of the universe.
With an assumption that the Higgs has a flat potential at the Planck scale, we
show that the B-L symmetry is radiatively broken at the TeV scale via the
Coleman-Weinberg mechanism, and it triggers the electroweak symmetry breaking
through a radiatively generated scalar mixing. The ratio of these two breaking
scales is dynamically determined by the B-L gauge coupling.
| [
{
"created": "Mon, 1 Apr 2013 04:09:43 GMT",
"version": "v1"
}
] | 2017-08-23 | [
[
"Iso",
"Satoshi",
""
]
] | The discovery of the Higgs particle at around 126 GeV has given us a big hint towards the origin of the Higgs potential. The running quartic self-coupling decreases and crosses zero somewhere in the very high energy scale. It is usually considered as a signal of the instability of the standard model (SM) vacuum, but it can also indicate a link between the physics in the electroweak scale and the Planck scale. Furthermore, the LHC experiments as well as the flavor physics experiments give strong constraints on the physics beyond the SM. It urges us to reconsider the widely taken approach to the physics beyond the SM (BSM), namely the approach based on the gauge unification below the Planck scale and the resulting hierarchy problem. Motivated by the recent experiments, we first revisit the hierarchy problem and consider an alternative appoach based on a classical conformality of the SM without the Higgs mass term. In this talk, I review our recent proposal of a B-L extension of the SM with a flat Higgs potential at the Planck scale. This model can be an alternative solution to the hierarchy problem as well as being phenomenologically viable to explain the neutrino oscillations and the baryon asymmetry of the universe. With an assumption that the Higgs has a flat potential at the Planck scale, we show that the B-L symmetry is radiatively broken at the TeV scale via the Coleman-Weinberg mechanism, and it triggers the electroweak symmetry breaking through a radiatively generated scalar mixing. The ratio of these two breaking scales is dynamically determined by the B-L gauge coupling. |
1407.6653 | Spyros Argyropoulos | Spyros Argyropoulos and Torbj\"orn Sj\"ostrand | Effects of color reconnection on $t\bar{t}$ final states at the LHC | 21 pages, 9 figures | null | 10.1007/JHEP11(2014)043 | LU TP 14-23, DESY 14-134, MCnet-14-15 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The modeling of color reconnection has become one of the dominant sources of
systematic uncertainty in the top mass determination at hadron colliders. The
uncertainty on the top mass due to color reconnection is conventionally
estimated by taking the difference in the predictions of a model with and a
model without color reconnection. We show that this procedure underestimates
the uncertainty when applied to the existing models in {\sc Pythia}~8. We
introduce two new classes of color reconnection models, each containing several
variants, which encompass a variety of scenarios that could be realized in
nature and we study how they affect the reconstruction of the top mass. After
tuning the new models to existing LHC data, the remaining spread of predictions
is used to derive a more realistic uncertainty for the top mass, which is found
to be around 500 MeV. We also propose how future LHC measurements with
$t\bar{t}$ events can be used to further constrain these models and reduce the
associated modeling uncertainty.
| [
{
"created": "Thu, 24 Jul 2014 17:17:33 GMT",
"version": "v1"
}
] | 2015-06-22 | [
[
"Argyropoulos",
"Spyros",
""
],
[
"Sjöstrand",
"Torbjörn",
""
]
] | The modeling of color reconnection has become one of the dominant sources of systematic uncertainty in the top mass determination at hadron colliders. The uncertainty on the top mass due to color reconnection is conventionally estimated by taking the difference in the predictions of a model with and a model without color reconnection. We show that this procedure underestimates the uncertainty when applied to the existing models in {\sc Pythia}~8. We introduce two new classes of color reconnection models, each containing several variants, which encompass a variety of scenarios that could be realized in nature and we study how they affect the reconstruction of the top mass. After tuning the new models to existing LHC data, the remaining spread of predictions is used to derive a more realistic uncertainty for the top mass, which is found to be around 500 MeV. We also propose how future LHC measurements with $t\bar{t}$ events can be used to further constrain these models and reduce the associated modeling uncertainty. |
1806.11549 | Valery Lyubovitskij | Thomas Gutsche, Mikhail A. Ivanov, J\"urgen G. K\"orner, Valery E.
Lyubovitskij | Nonleptonic two-body decays of single heavy baryons $\Lambda_Q$,
$\Xi_Q$, and $\Omega_Q$ $(Q=b,c)$ induced by $W$ emission in the covariant
confined quark model | 22 pages | Phys. Rev. D 98, 074011 (2018) | 10.1103/PhysRevD.98.074011 | MITP/18-039 (Mainz) | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We have made a survey of heavy-to-heavy and heavy-to-light nonleptonic heavy
baryon two-body decays and have identified those decays that proceed solely via
$W$-boson emission, i.e. via the tree graph contribution. Some sample decays
are $\Omega_{b}^{-}\to\Omega_{c}^{(*)0}\rho^{-}(\pi^{-}),\,
\Omega_{b}^{-}\to\Omega^{-}J/\psi(\eta_{c}),\,
\Xi_{b}^{0,-}\to\Xi^{0,-}J/\psi(\eta_{c}),\, \Lambda_{b}\to \Lambda
J/\psi(\eta_{c}),\, \Lambda_{b}\to \Lambda_{c} D_{s}^{(\ast)},\,
\Omega_{c}^{0}\to\Omega^{-}\rho^{+}(\pi^{+})$, and $\Lambda_c \to p \phi$. We
make use of the covariant confined quark model previously developed by us to
calculate the tree graph contributions to these decays. We calculate rates,
branching fractions and, for some of these decays, decay asymmetry parameters.
We compare our results to experimental findings and the results of other
theoretical approaches when they are available. Our main focus is on decays to
final states with a lepton pair because of their clean experimental signature.
For these decays we discuss two-fold polar angle decay distributions such as in
the cascade decay $\Omega_{b}^{-}\to\Omega^{-}(\to \Xi\pi,\Lambda
K^{-})+J/\psi(\to \ell^{+}\ell^{-})$. Lepton mass effects are always included
in our analysis.
| [
{
"created": "Fri, 29 Jun 2018 17:34:12 GMT",
"version": "v1"
},
{
"created": "Fri, 12 Oct 2018 22:44:12 GMT",
"version": "v2"
}
] | 2018-10-16 | [
[
"Gutsche",
"Thomas",
""
],
[
"Ivanov",
"Mikhail A.",
""
],
[
"Körner",
"Jürgen G.",
""
],
[
"Lyubovitskij",
"Valery E.",
""
]
] | We have made a survey of heavy-to-heavy and heavy-to-light nonleptonic heavy baryon two-body decays and have identified those decays that proceed solely via $W$-boson emission, i.e. via the tree graph contribution. Some sample decays are $\Omega_{b}^{-}\to\Omega_{c}^{(*)0}\rho^{-}(\pi^{-}),\, \Omega_{b}^{-}\to\Omega^{-}J/\psi(\eta_{c}),\, \Xi_{b}^{0,-}\to\Xi^{0,-}J/\psi(\eta_{c}),\, \Lambda_{b}\to \Lambda J/\psi(\eta_{c}),\, \Lambda_{b}\to \Lambda_{c} D_{s}^{(\ast)},\, \Omega_{c}^{0}\to\Omega^{-}\rho^{+}(\pi^{+})$, and $\Lambda_c \to p \phi$. We make use of the covariant confined quark model previously developed by us to calculate the tree graph contributions to these decays. We calculate rates, branching fractions and, for some of these decays, decay asymmetry parameters. We compare our results to experimental findings and the results of other theoretical approaches when they are available. Our main focus is on decays to final states with a lepton pair because of their clean experimental signature. For these decays we discuss two-fold polar angle decay distributions such as in the cascade decay $\Omega_{b}^{-}\to\Omega^{-}(\to \Xi\pi,\Lambda K^{-})+J/\psi(\to \ell^{+}\ell^{-})$. Lepton mass effects are always included in our analysis. |
1303.1211 | Zurab Tavartkiladze | Zurab Tavartkiladze | Three Family SU(5) GUT and Inverted Neutrino Mass Hierarchy | 15 pages LaTex, 2 figures | null | 10.1103/PhysRevD.87.075026 | CETUP*12-019 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Supersymmetric SU(5) GUT augmented with anomaly free U(1)_F flavor symmetry
is presented. Very economical field content and U(1)_F charge assignment are
obtained by specific construction. In particular, three families of 10+5*
chiral matter, along the SU(5) singlet states (some of which serve as right
handed neutrinos) are obtained. Appealing texture zero Yukawa matrices provide
natural understanding of hierarchies between charged fermion masses and
mixings. The model predicts inverted hierarchical neutrino mass scenario with
interesting implications.
| [
{
"created": "Tue, 5 Mar 2013 22:34:11 GMT",
"version": "v1"
}
] | 2015-03-13 | [
[
"Tavartkiladze",
"Zurab",
""
]
] | Supersymmetric SU(5) GUT augmented with anomaly free U(1)_F flavor symmetry is presented. Very economical field content and U(1)_F charge assignment are obtained by specific construction. In particular, three families of 10+5* chiral matter, along the SU(5) singlet states (some of which serve as right handed neutrinos) are obtained. Appealing texture zero Yukawa matrices provide natural understanding of hierarchies between charged fermion masses and mixings. The model predicts inverted hierarchical neutrino mass scenario with interesting implications. |
2304.02031 | Doojin Kim | P. S. Bhupal Dev, Bhaskar Dutta, Tao Han, Doojin Kim | Anomalous Tau Neutrino Appearance from Light Mediators in Short-Baseline
Neutrino Experiments | 9 pages, 1 table, 3 figures, journal-accepted version | null | null | MI-HET-797, PITT-PACC-2301 | hep-ph hep-ex | http://creativecommons.org/publicdomain/zero/1.0/ | We point out a new mechanism giving rise to anomalous tau neutrino appearance
at the near detectors of beam-focused neutrino experiments, without extending
the neutrino sector. The charged mesons ($\pi^\pm, K^\pm$) produced and focused
in the target-horn system can decay to a (neutrino-philic) light mediator via
the helicity-unsuppressed three-body decays. If such a mediator carries
non-vanishing hadronic couplings, it can also be produced via the
bremsstrahlung of the incident proton beam. The subsequent decay of the
mediator to a tau neutrino pair results in tau neutrino detection at the near
detectors, which is unexpected under the standard three-flavor neutrino
oscillation paradigm. We argue that the signal flux from the charged meson
decays can be significant enough to discover the light mediator signal at the
on-axis liquid-argon near detector of the DUNE experiment, due to the focusing
of charged mesons. In addition, we show that ICARUS-NuMI, an off-axis near
detector of the NuMI beam, as well as DUNE, can observe a handful of tau
neutrino events induced by beam-proton bremsstrahlung.
| [
{
"created": "Tue, 4 Apr 2023 18:00:00 GMT",
"version": "v1"
},
{
"created": "Wed, 7 Feb 2024 20:10:38 GMT",
"version": "v2"
}
] | 2024-02-09 | [
[
"Dev",
"P. S. Bhupal",
""
],
[
"Dutta",
"Bhaskar",
""
],
[
"Han",
"Tao",
""
],
[
"Kim",
"Doojin",
""
]
] | We point out a new mechanism giving rise to anomalous tau neutrino appearance at the near detectors of beam-focused neutrino experiments, without extending the neutrino sector. The charged mesons ($\pi^\pm, K^\pm$) produced and focused in the target-horn system can decay to a (neutrino-philic) light mediator via the helicity-unsuppressed three-body decays. If such a mediator carries non-vanishing hadronic couplings, it can also be produced via the bremsstrahlung of the incident proton beam. The subsequent decay of the mediator to a tau neutrino pair results in tau neutrino detection at the near detectors, which is unexpected under the standard three-flavor neutrino oscillation paradigm. We argue that the signal flux from the charged meson decays can be significant enough to discover the light mediator signal at the on-axis liquid-argon near detector of the DUNE experiment, due to the focusing of charged mesons. In addition, we show that ICARUS-NuMI, an off-axis near detector of the NuMI beam, as well as DUNE, can observe a handful of tau neutrino events induced by beam-proton bremsstrahlung. |
hep-ph/0105044 | Valery Lyubovitskij | V. E. Lyubovitskij (Tuebingen and Tomsk University), Th. Gutsche
(Tuebingen University), Amand Faessler (Tuebingen University) | Nucleon Properties in the Perturbative Chiral Quark Model | 8 pages. Invited talk given at Workshop on the Physics of Excited
Nucleons "NSTAR2001", Mainz, Germany, March 7-10, 2001 | null | 10.1142/9789812810878_0019 | null | hep-ph | null | We apply the perturbative chiral quark model (PCQM) to analyse low-energy
nucleon properties: electromagnetic form factors, meson-nucleon sigma-terms and
pion-nucleon scattering. Baryons are described as bound states of valence
quarks surrounded by a cloud of Goldstone bosons (pi, K, eta) as required by
chiral symmetry. The model is based on the following guide lines: chiral
symmetry constraints, fulfilment of low-energy theorems and proper treatment of
sea-quarks, that is meson cloud contributions. Analytic expressions for nucleon
observables are obtained in terms of fundamental parameters of low-energy
pion-nucleon physics (weak pion decay constant, axial nucleon coupling
constant, strong pion-nucleon form factor) and of only one model parameter
(radius of the nucleonic three-quark core). Our results are in good agreement
with experimental data and results of other theoretical approaches.
| [
{
"created": "Fri, 4 May 2001 17:55:23 GMT",
"version": "v1"
}
] | 2017-08-23 | [
[
"Lyubovitskij",
"V. E.",
"",
"Tuebingen and Tomsk University"
],
[
"Gutsche",
"Th.",
"",
"Tuebingen University"
],
[
"Faessler",
"Amand",
"",
"Tuebingen University"
]
] | We apply the perturbative chiral quark model (PCQM) to analyse low-energy nucleon properties: electromagnetic form factors, meson-nucleon sigma-terms and pion-nucleon scattering. Baryons are described as bound states of valence quarks surrounded by a cloud of Goldstone bosons (pi, K, eta) as required by chiral symmetry. The model is based on the following guide lines: chiral symmetry constraints, fulfilment of low-energy theorems and proper treatment of sea-quarks, that is meson cloud contributions. Analytic expressions for nucleon observables are obtained in terms of fundamental parameters of low-energy pion-nucleon physics (weak pion decay constant, axial nucleon coupling constant, strong pion-nucleon form factor) and of only one model parameter (radius of the nucleonic three-quark core). Our results are in good agreement with experimental data and results of other theoretical approaches. |
1612.09555 | Gilberto Ramalho | G. Ramalho | Semirelativistic approximation to the $\gamma^\ast N \to N(1520)$ and
$\gamma^\ast N \to N(1535)$ transition form factors | 5 figures, 14 pages. Published version | Phys. Rev. D 95, 054008 (2017) | 10.1103/PhysRevD.95.054008 | null | hep-ph hep-ex hep-lat nucl-ex nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The representation of the wave functions of the nucleon resonances within a
relativistic framework is a complex task. In a nonrelativistic framework the
orthogonality between states can be imposed naturally. In a relativistic
generalization, however, the derivation of the orthogonality condition between
states can be problematic, particularly when the states have different masses.
In this work we study the $N(1520)$ and $N(1535)$ states using a relativistic
framework. We considered wave functions derived in previous works, but impose
the orthogonality between the nucleon and resonance states using the properties
of the nucleon, ignoring the difference of masses between the states
(semirelativistic approximation). The $N(1520)$ and $N(1535)$ wave functions
are then defined without any adjustable parameters and are used to make
predictions for the valence quark contributions to the transition form factors.
The predictions compare well with the data particularly for high momentum
transfer, where the dominance of the quark degrees of freedom is expected.
| [
{
"created": "Fri, 30 Dec 2016 18:40:05 GMT",
"version": "v1"
},
{
"created": "Tue, 14 Mar 2017 19:40:37 GMT",
"version": "v2"
},
{
"created": "Thu, 16 Mar 2017 16:44:07 GMT",
"version": "v3"
}
] | 2017-03-17 | [
[
"Ramalho",
"G.",
""
]
] | The representation of the wave functions of the nucleon resonances within a relativistic framework is a complex task. In a nonrelativistic framework the orthogonality between states can be imposed naturally. In a relativistic generalization, however, the derivation of the orthogonality condition between states can be problematic, particularly when the states have different masses. In this work we study the $N(1520)$ and $N(1535)$ states using a relativistic framework. We considered wave functions derived in previous works, but impose the orthogonality between the nucleon and resonance states using the properties of the nucleon, ignoring the difference of masses between the states (semirelativistic approximation). The $N(1520)$ and $N(1535)$ wave functions are then defined without any adjustable parameters and are used to make predictions for the valence quark contributions to the transition form factors. The predictions compare well with the data particularly for high momentum transfer, where the dominance of the quark degrees of freedom is expected. |
hep-ph/0205027 | Micaela Oertel | M. Buballa, M. Oertel | Color superconductivity in two- and three-flavor systems at moderate
densities | 12 pages, 7 figures, to appear in: Proceedings of the NATO Advanced
Research Workshop on Confinement, Topology, and other Non-Perturbative
Aspects of QCD, Stara Lesna, Slovakia, Jan 21-27, 2002, references added | null | null | null | hep-ph | null | Basic features of color superconductivity are reviewed, focusing on the
regime of ``moderate densities'', which is not accessible by perturbation
theory. We discuss the standard picture of two- and three flavor color
superconductors and study the color-flavor unlocking phase transition within an
NJL-type model.
| [
{
"created": "Thu, 2 May 2002 18:18:51 GMT",
"version": "v1"
},
{
"created": "Mon, 6 May 2002 17:35:39 GMT",
"version": "v2"
}
] | 2007-05-23 | [
[
"Buballa",
"M.",
""
],
[
"Oertel",
"M.",
""
]
] | Basic features of color superconductivity are reviewed, focusing on the regime of ``moderate densities'', which is not accessible by perturbation theory. We discuss the standard picture of two- and three flavor color superconductors and study the color-flavor unlocking phase transition within an NJL-type model. |
hep-ph/9806500 | Jose Soares Barbosa | J. Sa Borges, J. Soares Barbosa, M. D. Tonasse and J. Haidenbauer | Two-Loop Chiral Perturbation Theory and the Pion-Pion Phase Shifts | 6 pages in latex 6 ps figures | Hadronic J. 22 (1999) 617-623 | null | null | hep-ph | null | We want to test the predictive power of Chiral Perturbation Theory (ChPT). In
this work, we use the ChPT pion-pion scattering amplitude, including two loop
contributions, and we obtain S- and P-wave low-energy phase shifts. We show
that, by varying just one free parameter, the resulting S- and P-wave phase
shifts are in reasonable agreement with the experimental data.
| [
{
"created": "Fri, 26 Jun 1998 14:55:08 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Borges",
"J. Sa",
""
],
[
"Barbosa",
"J. Soares",
""
],
[
"Tonasse",
"M. D.",
""
],
[
"Haidenbauer",
"J.",
""
]
] | We want to test the predictive power of Chiral Perturbation Theory (ChPT). In this work, we use the ChPT pion-pion scattering amplitude, including two loop contributions, and we obtain S- and P-wave low-energy phase shifts. We show that, by varying just one free parameter, the resulting S- and P-wave phase shifts are in reasonable agreement with the experimental data. |
1911.09834 | Naoki Yamatsu | Taichiro Kugo, Naoki Yamatsu | Dynamical Breaking to Special or Regular Subgroups in $SO(N)$
Nambu--Jona-Lasinio Model | 30 pages, 7 tables, no figures; typos corrected | Prog Theor Exp Phys (2020) | 10.1093/ptep/ptaa001 | YITP-19-107, KYUSHU-HET-201 | hep-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | It is recently shown that in 4D $SU(N)$ Nambu--Jona-Lasinio (NJL) type
models, the $SU(N)$ symmetry breaking into its special subgroups is not special
but much more common than that into the regular subgroups, where the fermions
belong to complex representations of $SU(N)$. We perform the same analysis for
$SO(N)$ NJL model for various $N$ with fermions belonging to an irreducible
spinor representation of $SO(N)$. We find that the symmetry breaking into
special or regular subgroups has some correlation with the type of fermion
representations; i.e., complex, real, pseudo-real representations.
| [
{
"created": "Fri, 22 Nov 2019 03:38:29 GMT",
"version": "v1"
},
{
"created": "Sun, 29 Dec 2019 00:00:44 GMT",
"version": "v2"
}
] | 2020-03-04 | [
[
"Kugo",
"Taichiro",
""
],
[
"Yamatsu",
"Naoki",
""
]
] | It is recently shown that in 4D $SU(N)$ Nambu--Jona-Lasinio (NJL) type models, the $SU(N)$ symmetry breaking into its special subgroups is not special but much more common than that into the regular subgroups, where the fermions belong to complex representations of $SU(N)$. We perform the same analysis for $SO(N)$ NJL model for various $N$ with fermions belonging to an irreducible spinor representation of $SO(N)$. We find that the symmetry breaking into special or regular subgroups has some correlation with the type of fermion representations; i.e., complex, real, pseudo-real representations. |
hep-ph/9607287 | Sasha | Alexander Kusenko | Color and charge breaking minima in the MSSM | 3 pages, latex, macros and three figures included, complete
postscript file is available at
ftp://dept.physics.upenn.edu/pub/Kusenko/SUSY96.ps . Talk presented at
SUSY'96, University of Maryland, May 29 - June 1, 1996 | Nucl.Phys.Proc.Suppl. 52A (1997) 67-69 | 10.1016/S0920-5632(96)00535-X | null | hep-ph | null | The scalar potential of theories with broken supersymmetry can have a number
of local minima characterized by different gauge groups. Symmetry properties of
the physical vacuum constrain the parameters of the MSSM. We discuss these
constraints, in particular those that result from the vacuum stability with
respect to quantum tunneling.
| [
{
"created": "Thu, 11 Jul 1996 03:43:48 GMT",
"version": "v1"
}
] | 2009-10-28 | [
[
"Kusenko",
"Alexander",
""
]
] | The scalar potential of theories with broken supersymmetry can have a number of local minima characterized by different gauge groups. Symmetry properties of the physical vacuum constrain the parameters of the MSSM. We discuss these constraints, in particular those that result from the vacuum stability with respect to quantum tunneling. |
hep-ph/9407265 | null | Zurab G. Berezhiani and Anna Rossi | Majoron Decay in Matter | 11 pages, no figures, LATEX, INFN-FE-04-94 | Phys.Lett. B336 (1994) 439-445 | 10.1016/0370-2693(94)90556-8 | null | hep-ph | null | It is well known that the matter can significantly alter the picture of
neutrino oscillation \cite{W} or neutrino decay \cite{BV}. Here we show that
the presence of dense matter induces also the decay of {\it massless} majoron,
a Goldstone boson associated with the spontaneous lepton number violation, into
a couple of neutrinos with the same (or in some cases also opposite)
helicities. We calculate the rates of such matter induced majoron decays in
various cases, depending on the neutrino type and the chemical content of the
medium, and analyse their properties.
| [
{
"created": "Mon, 11 Jul 1994 13:03:08 GMT",
"version": "v1"
}
] | 2009-10-28 | [
[
"Berezhiani",
"Zurab G.",
""
],
[
"Rossi",
"Anna",
""
]
] | It is well known that the matter can significantly alter the picture of neutrino oscillation \cite{W} or neutrino decay \cite{BV}. Here we show that the presence of dense matter induces also the decay of {\it massless} majoron, a Goldstone boson associated with the spontaneous lepton number violation, into a couple of neutrinos with the same (or in some cases also opposite) helicities. We calculate the rates of such matter induced majoron decays in various cases, depending on the neutrino type and the chemical content of the medium, and analyse their properties. |
0804.2643 | Ruben Garcia-Martin | R. Garcia-Martin, R. Kaminski, J. R. Pelaez | Precise determination of the sigma pole location from a dispersive
analysis | 5 pages, 2 figures. To appear in the proceedings of the Workshop on
Scalar Mesons and Related Topics, Lisbon, Portugal, 11-16 Feb 2008 | AIPConf.Proc.1030:263-267,2008 | 10.1063/1.2973510 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We review how the use of recent precise data on kaon decays together with
forward dispersion relations (FDR) and Roy's equations allow us to determine
the sigma resonance pole position very precisely, by using only experimental
input. In addition, we present preliminary results for a modified set of
Roy-like equations with only one subtraction, that show a remarkable
improvement in the precision around the sigma resonance region. For practical
applications, these results are shown to be very well approximated by a very
simple conformal expansion.
| [
{
"created": "Wed, 16 Apr 2008 16:48:51 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Garcia-Martin",
"R.",
""
],
[
"Kaminski",
"R.",
""
],
[
"Pelaez",
"J. R.",
""
]
] | We review how the use of recent precise data on kaon decays together with forward dispersion relations (FDR) and Roy's equations allow us to determine the sigma resonance pole position very precisely, by using only experimental input. In addition, we present preliminary results for a modified set of Roy-like equations with only one subtraction, that show a remarkable improvement in the precision around the sigma resonance region. For practical applications, these results are shown to be very well approximated by a very simple conformal expansion. |
1803.07267 | Noriyuki Sogabe | Masaru Hongo, Noriyuki Sogabe, Naoki Yamamoto | Does the chiral magnetic effect change the dynamic universality class in
QCD? | 32 pages, 8 figures; v2: title and abstract modified, main results
changed, discussions substantially extended, published in JHEP | null | 10.1007/JHEP11(2018)108 | RIKEN-iTHEMS-Report-18 | hep-ph cond-mat.mes-hall cond-mat.stat-mech nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In QCD matter under an external magnetic field, the chiral magnetic effect
(CME) leads to the collective gapless mode called the chiral magnetic wave
(CMW). Since dynamic universality class generally depends on low-energy gapless
modes, it is nontrivial whether the CME and the resulting CMW change that of
the second-order chiral phase transition in QCD. To address this question, we
study the critical dynamics near the chiral phase transition in massless
two-flavor QCD under an external magnetic field. By performing the dynamic
renormalization-group analysis within the epsilon expansion, we find that the
presence of the CME changes the dynamic universality class to that of model A.
We also show that the transport coefficient of the CME is not renormalized by
the critical fluctuations of the order parameter.
| [
{
"created": "Tue, 20 Mar 2018 06:16:45 GMT",
"version": "v1"
},
{
"created": "Fri, 23 Nov 2018 14:27:23 GMT",
"version": "v2"
}
] | 2018-11-26 | [
[
"Hongo",
"Masaru",
""
],
[
"Sogabe",
"Noriyuki",
""
],
[
"Yamamoto",
"Naoki",
""
]
] | In QCD matter under an external magnetic field, the chiral magnetic effect (CME) leads to the collective gapless mode called the chiral magnetic wave (CMW). Since dynamic universality class generally depends on low-energy gapless modes, it is nontrivial whether the CME and the resulting CMW change that of the second-order chiral phase transition in QCD. To address this question, we study the critical dynamics near the chiral phase transition in massless two-flavor QCD under an external magnetic field. By performing the dynamic renormalization-group analysis within the epsilon expansion, we find that the presence of the CME changes the dynamic universality class to that of model A. We also show that the transport coefficient of the CME is not renormalized by the critical fluctuations of the order parameter. |
1901.10940 | Lobsang Dhargyal | Lobsang Dhargyal | Phenomenology of a universal super weak $SU(N)_{w}$ color hypothesis | an Erratum to the previous versions is written in the foot note on
page 2 | null | null | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this work we will propose a new universal super weak $SU(N)_{w}$ (or self
interacting vector bosons) color to which all the SM fermions are assumed to be
coupled universally whose confining radius is in the range of the size of
galaxies. We will argue that the model has some very interesting consequences
such as it could be able to explain the observed rotation velocity anomalies in
large galaxies without requirement of specific DM particle. We will also show
that it could constitute most of the observed mass of a galaxy, similar like
the proton mass which is mostly made up of color interaction dynamics as shown
recently, which could explain the observed DM in the rotation velocities of
galaxies in galaxy clusters. Also when the N is very small, we will show that
it could explain the Big Bang and Hubble's law, Dark Energy, and tentatively
also flavor and neutrino oscillation.
| [
{
"created": "Wed, 30 Jan 2019 16:38:30 GMT",
"version": "v1"
},
{
"created": "Wed, 25 Aug 2021 11:53:10 GMT",
"version": "v10"
},
{
"created": "Mon, 4 Feb 2019 15:29:55 GMT",
"version": "v2"
},
{
"created": "Fri, 22 Feb 2019 15:38:33 GMT",
"version": "v3"
},
{
"created": "Fri, 21 Jun 2019 14:49:49 GMT",
"version": "v4"
},
{
"created": "Wed, 31 Jul 2019 17:00:16 GMT",
"version": "v5"
},
{
"created": "Thu, 19 Sep 2019 16:19:26 GMT",
"version": "v6"
},
{
"created": "Thu, 24 Oct 2019 07:05:10 GMT",
"version": "v7"
},
{
"created": "Mon, 10 Feb 2020 12:10:28 GMT",
"version": "v8"
},
{
"created": "Sun, 1 Aug 2021 14:55:09 GMT",
"version": "v9"
}
] | 2021-08-26 | [
[
"Dhargyal",
"Lobsang",
""
]
] | In this work we will propose a new universal super weak $SU(N)_{w}$ (or self interacting vector bosons) color to which all the SM fermions are assumed to be coupled universally whose confining radius is in the range of the size of galaxies. We will argue that the model has some very interesting consequences such as it could be able to explain the observed rotation velocity anomalies in large galaxies without requirement of specific DM particle. We will also show that it could constitute most of the observed mass of a galaxy, similar like the proton mass which is mostly made up of color interaction dynamics as shown recently, which could explain the observed DM in the rotation velocities of galaxies in galaxy clusters. Also when the N is very small, we will show that it could explain the Big Bang and Hubble's law, Dark Energy, and tentatively also flavor and neutrino oscillation. |
hep-ph/0407366 | F. Krauss | T. Gleisberg, S. Hoeche, F. Krauss, A. Schaelicke, S. Schumann, J.
Winter, G. Soff | New tools for automatic cross section calculation | 4 pages, talk given by F. Krauss at DIS2004 | null | null | null | hep-ph | null | In this contribution the matrix element generator AMEGIC++ will be presented.
It automatically generates Feynman diagrams, helicity amplitudes, and suitable
phase space mappings for processes involving multi-particle final states within
the Standard Model and some of its popular extensions.
| [
{
"created": "Fri, 30 Jul 2004 15:55:51 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Gleisberg",
"T.",
""
],
[
"Hoeche",
"S.",
""
],
[
"Krauss",
"F.",
""
],
[
"Schaelicke",
"A.",
""
],
[
"Schumann",
"S.",
""
],
[
"Winter",
"J.",
""
],
[
"Soff",
"G.",
""
]
] | In this contribution the matrix element generator AMEGIC++ will be presented. It automatically generates Feynman diagrams, helicity amplitudes, and suitable phase space mappings for processes involving multi-particle final states within the Standard Model and some of its popular extensions. |
1702.02163 | Mehedi Masud | Jogesh Rout, Mehedi Masud, Poonam Mehta | Can we probe intrinsic CP/T violation and non-unitarity at long baseline
accelerator experiments? | To appear in PRD | Phys. Rev. D 95, 075035 (2017) | 10.1103/PhysRevD.95.075035 | null | hep-ph hep-ex hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | One of the fundamental parameters entering neutrino oscillation framework is
the leptonic CP phase $\delta_{13}$ and its measurement is an important goal of
the planned long baseline experiments. It should be noted that ordinary matter
effects complicate the determination of this parameter and there are studies in
literature that deal with separation of intrinsic versus extrinsic CP
violation. It is important to investigate the consequences of new physics
effects that can not only hamper the measurement of $\delta_{13}$, but also
impact the consequences of discrete symmetries such as CP, T and unitarity in
different oscillation channels. In the present work, we explore these discrete
symmetries and implications on unitarity in presence of two new physics
scenarios (non-standard interaction in propagation and presence of sterile
neutrinos) that serve as good examples of going beyond the standard scenario in
different directions. We uncover the impact of new physics scenarios on
disentangling intrinsic and extrinsic CP violation.
| [
{
"created": "Tue, 7 Feb 2017 19:02:14 GMT",
"version": "v1"
},
{
"created": "Tue, 4 Apr 2017 17:56:53 GMT",
"version": "v2"
}
] | 2017-05-03 | [
[
"Rout",
"Jogesh",
""
],
[
"Masud",
"Mehedi",
""
],
[
"Mehta",
"Poonam",
""
]
] | One of the fundamental parameters entering neutrino oscillation framework is the leptonic CP phase $\delta_{13}$ and its measurement is an important goal of the planned long baseline experiments. It should be noted that ordinary matter effects complicate the determination of this parameter and there are studies in literature that deal with separation of intrinsic versus extrinsic CP violation. It is important to investigate the consequences of new physics effects that can not only hamper the measurement of $\delta_{13}$, but also impact the consequences of discrete symmetries such as CP, T and unitarity in different oscillation channels. In the present work, we explore these discrete symmetries and implications on unitarity in presence of two new physics scenarios (non-standard interaction in propagation and presence of sterile neutrinos) that serve as good examples of going beyond the standard scenario in different directions. We uncover the impact of new physics scenarios on disentangling intrinsic and extrinsic CP violation. |
1709.03018 | Yan-Qing Ma | Yan-Qing Ma, Jian-Wei Qiu | Exploring hadrons' partonic structure using ab initio lattice QCD
calculations | 6 pages, 1 figure, version accepted by Physical Review Letters | Phys. Rev. Lett. 120, 022003 (2018) | 10.1103/PhysRevLett.120.022003 | null | hep-ph hep-lat nucl-ex nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Following our previous proposal [1], we construct a class of good "lattice
cross sections" (LCSs), from which we could study partonic structure of hadrons
from ab initio lattice QCD calculations. These good LCSs, on the one hand, can
be calculated directly in lattice QCD, and on the other hand, can be factorized
into parton distribution functions (PDFs) with calculable coefficients, in the
same way as QCD factorization for factorizable hadronic cross sections. PDFs
could be extracted from QCD global analysis of the lattice QCD generated data
of LCSs. We also show that proposed functions for lattice QCD calculation of
PDFs in the literature are special cases of these good LCSs.
| [
{
"created": "Sat, 9 Sep 2017 23:34:31 GMT",
"version": "v1"
},
{
"created": "Wed, 6 Dec 2017 11:32:58 GMT",
"version": "v2"
}
] | 2018-01-12 | [
[
"Ma",
"Yan-Qing",
""
],
[
"Qiu",
"Jian-Wei",
""
]
] | Following our previous proposal [1], we construct a class of good "lattice cross sections" (LCSs), from which we could study partonic structure of hadrons from ab initio lattice QCD calculations. These good LCSs, on the one hand, can be calculated directly in lattice QCD, and on the other hand, can be factorized into parton distribution functions (PDFs) with calculable coefficients, in the same way as QCD factorization for factorizable hadronic cross sections. PDFs could be extracted from QCD global analysis of the lattice QCD generated data of LCSs. We also show that proposed functions for lattice QCD calculation of PDFs in the literature are special cases of these good LCSs. |
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