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|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
0710.1084 | Dam Thanh Son | D. T. Son and M. A. Stephanov | Axial anomaly and magnetism of nuclear and quark matter | 18 pages, v2: added a discussion of the energy cost of neutralizing
the domain wall charge | Phys.Rev.D77:014021,2008 | 10.1103/PhysRevD.77.014021 | INT PUB 07-24 | hep-ph astro-ph nucl-th | null | We consider the response of the QCD ground state at finite baryon density to
a strong magnetic field B. We point out the dominant role played by the
coupling of neutral Goldstone bosons, such as pi^0, to the magnetic field via
the axial triangle anomaly. We show that, in vacuum, above a value of B ~
m_pi^2/e, a metastable object appears - the pi^0 domain wall. Because of the
axial anomaly, the wall carries a baryon number surface density proportional to
B. As a result, for B ~ 10^{19} G a stack of parallel pi^0 domain walls is
energetically more favorable than nuclear matter at the same density.
Similarly, at higher densities, somewhat weaker magnetic fields of order B ~
10^{17}-10^{18} G transform the color-superconducting ground state of QCD into
new phases containing stacks of axial isoscalar (eta or eta') domain walls. We
also show that a quark-matter state known as ``Goldstone current state,'' in
which a gradient of a Goldstone field is spontaneously generated, is
ferromagnetic due to the axial anomaly. We estimate the size of the fields
created by such a state in a typical neutron star to be of order
10^{14}-10^{15} G.
| [
{
"created": "Fri, 5 Oct 2007 17:34:36 GMT",
"version": "v1"
},
{
"created": "Wed, 23 Jan 2008 23:37:44 GMT",
"version": "v2"
}
] | 2008-11-26 | [
[
"Son",
"D. T.",
""
],
[
"Stephanov",
"M. A.",
""
]
] | We consider the response of the QCD ground state at finite baryon density to a strong magnetic field B. We point out the dominant role played by the coupling of neutral Goldstone bosons, such as pi^0, to the magnetic field via the axial triangle anomaly. We show that, in vacuum, above a value of B ~ m_pi^2/e, a metastable object appears - the pi^0 domain wall. Because of the axial anomaly, the wall carries a baryon number surface density proportional to B. As a result, for B ~ 10^{19} G a stack of parallel pi^0 domain walls is energetically more favorable than nuclear matter at the same density. Similarly, at higher densities, somewhat weaker magnetic fields of order B ~ 10^{17}-10^{18} G transform the color-superconducting ground state of QCD into new phases containing stacks of axial isoscalar (eta or eta') domain walls. We also show that a quark-matter state known as ``Goldstone current state,'' in which a gradient of a Goldstone field is spontaneously generated, is ferromagnetic due to the axial anomaly. We estimate the size of the fields created by such a state in a typical neutron star to be of order 10^{14}-10^{15} G. |
1912.05572 | Gopolang Mohlabeng | Hooman Davoudiasl and Gopolang Mohlabeng | Getting a THUMP from a WIMP | 7 pages, 3 figures, Expanded and clarified the text, and added a plot
in figure 2. The original results and main conclusions remain unchanged.
Version published in JHEP | null | 10.1007/JHEP04(2020)177 | null | hep-ph astro-ph.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Producing an acceptable thermal relic abundance of dark matter with masses
$\gg 10^2$ TeV is a challenge. We propose a novel mechanism where GeV-scale
states establish a tiny thermal relic abundance for dark matter, which is later
promoted to ultra massive status by a very light scalar. We refer to this dark
matter as a THermal Ultra Massive Particle (THUMP). Direct detection of THUMPs
can be naturally expected due to large scattering cross sections mediated by
low mass states that couple THUMPs to the Standard Model. Our model generically
leads to signals for the associated GeV-scale states at accelerator
experiments.
| [
{
"created": "Wed, 11 Dec 2019 19:03:16 GMT",
"version": "v1"
},
{
"created": "Tue, 14 Jan 2020 19:19:06 GMT",
"version": "v2"
},
{
"created": "Thu, 30 Apr 2020 18:49:46 GMT",
"version": "v3"
}
] | 2020-05-04 | [
[
"Davoudiasl",
"Hooman",
""
],
[
"Mohlabeng",
"Gopolang",
""
]
] | Producing an acceptable thermal relic abundance of dark matter with masses $\gg 10^2$ TeV is a challenge. We propose a novel mechanism where GeV-scale states establish a tiny thermal relic abundance for dark matter, which is later promoted to ultra massive status by a very light scalar. We refer to this dark matter as a THermal Ultra Massive Particle (THUMP). Direct detection of THUMPs can be naturally expected due to large scattering cross sections mediated by low mass states that couple THUMPs to the Standard Model. Our model generically leads to signals for the associated GeV-scale states at accelerator experiments. |
1302.5126 | Janos Polonyi | F. Mansouri, J. Polonyi, K. Zazoua, N. Zekri | Proton scattering on an electron gas | Final version, to appear in International Journal of Modern Physics A | null | null | null | hep-ph cond-mat.quant-gas | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | It is shown in the case of proton scattering on an electron gas target that
the Closed Time Path formalism can handle final state interactions of the
target in equilibrium in a simple and natural manner. The leading order cross
section is proportional to the photon density of states. The scattering needs a
partial resummation of the perturbation series when the electron gas forms long
living quasi-particles with high density of state during the collision. A
strong cancellation between real and virtual electron-hole pairs is found in
this case.
| [
{
"created": "Wed, 20 Feb 2013 21:25:20 GMT",
"version": "v1"
},
{
"created": "Sat, 15 Jun 2013 06:43:34 GMT",
"version": "v2"
}
] | 2013-06-18 | [
[
"Mansouri",
"F.",
""
],
[
"Polonyi",
"J.",
""
],
[
"Zazoua",
"K.",
""
],
[
"Zekri",
"N.",
""
]
] | It is shown in the case of proton scattering on an electron gas target that the Closed Time Path formalism can handle final state interactions of the target in equilibrium in a simple and natural manner. The leading order cross section is proportional to the photon density of states. The scattering needs a partial resummation of the perturbation series when the electron gas forms long living quasi-particles with high density of state during the collision. A strong cancellation between real and virtual electron-hole pairs is found in this case. |
1504.02973 | Mikhail Voloshin | M.B. Voloshin | The process $e^+e^- \to \pi \pi X(3823)$ in the soft pion limit | 7 pages, 2 figures | Phys. Rev. D 91, 114029 (2015) | 10.1103/PhysRevD.91.114029 | FTPI-MINN-15/17, UMN-TH-3430/15 | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The production of the resonance $X(3823)$, identified as the charmonium
$^3D_2$ state, in the process $e^+e^- \to \pi \pi X(3823)$ has been recently
reported by BESIII. It is pointed out that this process is fully described, up
to one overall coupling constant, in the soft pion limit. An interpretation of
the available and possible future data within the discussed theoretical
framework may reveal new features of the charmoniumlike states. In particular,
the observed relative yield for this process at different energies strongly
suggests a very significant enhancement of the amplitude at the charmoniumlike
peak near 4.36\,GeV.
| [
{
"created": "Sun, 12 Apr 2015 13:39:31 GMT",
"version": "v1"
},
{
"created": "Wed, 29 Apr 2015 15:19:22 GMT",
"version": "v2"
}
] | 2015-07-01 | [
[
"Voloshin",
"M. B.",
""
]
] | The production of the resonance $X(3823)$, identified as the charmonium $^3D_2$ state, in the process $e^+e^- \to \pi \pi X(3823)$ has been recently reported by BESIII. It is pointed out that this process is fully described, up to one overall coupling constant, in the soft pion limit. An interpretation of the available and possible future data within the discussed theoretical framework may reveal new features of the charmoniumlike states. In particular, the observed relative yield for this process at different energies strongly suggests a very significant enhancement of the amplitude at the charmoniumlike peak near 4.36\,GeV. |
2211.14379 | Clemens Werthmann | Victor E. Ambrus, S. Schlichting, C. Werthmann | Opacity dependence of transverse flow, pre-equilibrium and applicability
of hydrodynamics in heavy-ion collisions | 35 pages, 15 figures. v2: Several minor changes to spelling,
notation, affiliations, acknowledgements, references. Equivalent to version
published in PRD. Figure 8 had to be scaled down dramatically because
otherwise it wouldn't compile on the arXiv server | null | 10.1103/PhysRevD.107.094013 | null | hep-ph nucl-th | http://creativecommons.org/licenses/by-nc-nd/4.0/ | We evaluate the full opacity dependence of collective flow in high-energy
heavy-ion collisions within a microscopic kinetic description based on the
Boltzmann equation in the conformal relaxation time approximation. By comparing
kinetic theory calculations to hydrodynamic and hybrid simulations for an
average initial state, we point out shortcomings and inaccuracies of
hydrodynamic models and present modified simulation setups to improve them.
| [
{
"created": "Fri, 25 Nov 2022 21:35:32 GMT",
"version": "v1"
},
{
"created": "Thu, 11 May 2023 16:46:26 GMT",
"version": "v2"
}
] | 2023-05-24 | [
[
"Ambrus",
"Victor E.",
""
],
[
"Schlichting",
"S.",
""
],
[
"Werthmann",
"C.",
""
]
] | We evaluate the full opacity dependence of collective flow in high-energy heavy-ion collisions within a microscopic kinetic description based on the Boltzmann equation in the conformal relaxation time approximation. By comparing kinetic theory calculations to hydrodynamic and hybrid simulations for an average initial state, we point out shortcomings and inaccuracies of hydrodynamic models and present modified simulation setups to improve them. |
1509.04060 | Ying Li | Si-Hong Zhou, Yan-Bing Wei, Qin Qin, Ying Li, Fu-Sheng Yu, Cai-Dian Lu | Analysis of Two-body Charmed $B$ Meson Decays in Factorization-Assisted
Topological-Amplitude Approach | 24 pages, 3 figues | Phys.Rev. D92 (2015) no.9, 094016 | 10.1103/PhysRevD.92.094016 | null | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Within the factorization-assisted topological-amplitude approach, we study
the two-body charmed $B$ meson decays $B_{u,d,s} \to D^{(*)}M$, with $M$
denoting a light pseudoscalar (or vector) meson. The meson decay constants and
transition form factors are factorized out from the hadronic matrix element of
topological diagrams. Therefore the effect of SU(3) symmetry breaking is
retained, which is different from the conventional topological diagram
approach. The number of free nonperturbative parameters to be fitted from
experimental data is also much less. Only four universal nonperturbative
parameters $\chi^C$, $\phi^C$, $\chi^E$ and $\phi^E$ are introduced to describe
the contribution of the color suppressed tree and $W$-exchanged diagrams for
all the decay channels. With the fitted parameters from 31 decay modes induced
by $b\to c$ transition, we then predict the branching fractions of 120 decay
modes induced by both $b\to c$ and $b\to u$ transitions. Our results are well
consistent with the measured data or to be tested in the LHCb and Belle-II
experiments in the future. Besides, the SU(3) symmetry breaking, isospin
violation and $CP$ asymmetry are also investigated.
| [
{
"created": "Mon, 14 Sep 2015 12:39:35 GMT",
"version": "v1"
}
] | 2016-04-13 | [
[
"Zhou",
"Si-Hong",
""
],
[
"Wei",
"Yan-Bing",
""
],
[
"Qin",
"Qin",
""
],
[
"Li",
"Ying",
""
],
[
"Yu",
"Fu-Sheng",
""
],
[
"Lu",
"Cai-Dian",
""
]
] | Within the factorization-assisted topological-amplitude approach, we study the two-body charmed $B$ meson decays $B_{u,d,s} \to D^{(*)}M$, with $M$ denoting a light pseudoscalar (or vector) meson. The meson decay constants and transition form factors are factorized out from the hadronic matrix element of topological diagrams. Therefore the effect of SU(3) symmetry breaking is retained, which is different from the conventional topological diagram approach. The number of free nonperturbative parameters to be fitted from experimental data is also much less. Only four universal nonperturbative parameters $\chi^C$, $\phi^C$, $\chi^E$ and $\phi^E$ are introduced to describe the contribution of the color suppressed tree and $W$-exchanged diagrams for all the decay channels. With the fitted parameters from 31 decay modes induced by $b\to c$ transition, we then predict the branching fractions of 120 decay modes induced by both $b\to c$ and $b\to u$ transitions. Our results are well consistent with the measured data or to be tested in the LHCb and Belle-II experiments in the future. Besides, the SU(3) symmetry breaking, isospin violation and $CP$ asymmetry are also investigated. |
hep-ph/9312357 | Ed Stoeffhaas | A. Duff and D. Zeppenfeld | Heavy Higgs Boson Production in Association with Three Jets at Hadron
Supercolliders | 29 pages, uses Revtex version 3. 12 postscript figures, uufiled and
submitted to hep-ph. MAD/PH/800 | Phys.Rev. D50 (1994) 3204-3217 | 10.1103/PhysRevD.50.3204 | null | hep-ph | null | We consider the real emission QCD correction to heavy Higgs boson production
via weak boson fusion in high energy $pp$ collisions. The ${\cal O}(\alpha_s)$
corrections are determined for the complete electroweak $q q \rightarrow q q
W^+ W^-$ process. The presence of a third parton in the final state affects the
formation of rapidity gaps only slightly. In particular, soft emission into the
gap region is severely suppressed. Also, we investigate how the additional hard
emission affects forward-jet-tagging and central-jet-vetoing efficiencies in
the search for $H \rightarrow W^+ W^- \rightarrow \ell^+ \nu \ell^- \bar{\nu}$
decays.
| [
{
"created": "Thu, 30 Dec 1993 21:37:25 GMT",
"version": "v1"
}
] | 2009-10-22 | [
[
"Duff",
"A.",
""
],
[
"Zeppenfeld",
"D.",
""
]
] | We consider the real emission QCD correction to heavy Higgs boson production via weak boson fusion in high energy $pp$ collisions. The ${\cal O}(\alpha_s)$ corrections are determined for the complete electroweak $q q \rightarrow q q W^+ W^-$ process. The presence of a third parton in the final state affects the formation of rapidity gaps only slightly. In particular, soft emission into the gap region is severely suppressed. Also, we investigate how the additional hard emission affects forward-jet-tagging and central-jet-vetoing efficiencies in the search for $H \rightarrow W^+ W^- \rightarrow \ell^+ \nu \ell^- \bar{\nu}$ decays. |
hep-ph/0204283 | German Rodrigo | Johann H. Kuhn, German Rodrigo | The radiative return at small angles: virtual corrections | 8 pages, 2 figures | Eur.Phys.J.C25:215-222,2002 | 10.1007/s10052-002-0999-6 | CERN-TH/2002-082, TTP02-03 | hep-ph | null | Virtual corrections for electron--positron annihilation into one real and one
off-shell photon of invariant mass Q^2 are evaluated. Special attention is paid
to those configurations where the real photon is collinear with the beam
direction. This calculation is an important ingredient of a Monte Carlo
program, which simulates events with tagged photons from initial-state
radiation, including NLO corrections.
| [
{
"created": "Wed, 24 Apr 2002 13:34:22 GMT",
"version": "v1"
}
] | 2009-01-07 | [
[
"Kuhn",
"Johann H.",
""
],
[
"Rodrigo",
"German",
""
]
] | Virtual corrections for electron--positron annihilation into one real and one off-shell photon of invariant mass Q^2 are evaluated. Special attention is paid to those configurations where the real photon is collinear with the beam direction. This calculation is an important ingredient of a Monte Carlo program, which simulates events with tagged photons from initial-state radiation, including NLO corrections. |
1511.03207 | Giorgio Arcadi | Giorgio Arcadi | Dark Matter and Baryon Asymmetry production from out-of-equilibrium
decays of Supersymmetric states | 7 pages, 1 figure. Prepared for the proceedings of the 6th Young
Researchers Meeting, L'Aquila | null | 10.1088/1742-6596/689/1/012001 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We will review the main aspects of a mechanism for the contemporary
generation of the baryon and Dark Matter abundances from the out-of-equilibrium
decay of a Wimp-like mother particle and briefly discuss a concrete realization
in a Supersymmetric scenario.
| [
{
"created": "Tue, 10 Nov 2015 18:08:22 GMT",
"version": "v1"
}
] | 2016-03-23 | [
[
"Arcadi",
"Giorgio",
""
]
] | We will review the main aspects of a mechanism for the contemporary generation of the baryon and Dark Matter abundances from the out-of-equilibrium decay of a Wimp-like mother particle and briefly discuss a concrete realization in a Supersymmetric scenario. |
1007.5152 | Kazunori Nakayama | Kazunori Nakayama, Fuminobu Takahashi, Tsutomu T. Yanagida | Constraint on the gravitino mass in hybrid inflation | 20 pages, 5 figures; published version | JCAP 1012:010,2010 | 10.1088/1475-7516/2010/12/010 | KEK-TH-1382, IPMU10-0127 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We revisit the F-term hybrid inflation model in supergravity. In particular,
we point out that a constant term in the superpotential has significant effects
on the inflaton dynamics. It is shown that the hybrid inflation model suffers
from several potential problems: tuning of the initial condition, gravitino
overproduction and formation of cosmic strings, for both minimal and
non-minimal Kahler potentials. These problems can only be avoided in
gauge-mediated SUSY breaking models where the gravitino is relatively light and
the constant term in the superpotential is not important. Implications on the
non-thermal leptogenesis scenario are also described.
| [
{
"created": "Thu, 29 Jul 2010 09:07:59 GMT",
"version": "v1"
},
{
"created": "Thu, 14 Apr 2011 01:34:15 GMT",
"version": "v2"
}
] | 2011-04-15 | [
[
"Nakayama",
"Kazunori",
""
],
[
"Takahashi",
"Fuminobu",
""
],
[
"Yanagida",
"Tsutomu T.",
""
]
] | We revisit the F-term hybrid inflation model in supergravity. In particular, we point out that a constant term in the superpotential has significant effects on the inflaton dynamics. It is shown that the hybrid inflation model suffers from several potential problems: tuning of the initial condition, gravitino overproduction and formation of cosmic strings, for both minimal and non-minimal Kahler potentials. These problems can only be avoided in gauge-mediated SUSY breaking models where the gravitino is relatively light and the constant term in the superpotential is not important. Implications on the non-thermal leptogenesis scenario are also described. |
1310.3059 | Sergey Alekhin | S. Alekhin, J. Bluemlein, S. Moch | The ABM parton distributions tuned to LHC data | 31 pages, 15 figures | Phys. Rev. D 89, 054028 (2014) | 10.1103/PhysRevD.89.054028 | DESY 13-183, DO-TH 13/26, SFB/CPP-13-71, LPN 13-068 | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present a global fit of parton distributions at next-to-next-to-leading
order (NNLO) in QCD. The fit is based on the world data for deep-inelastic
scattering, fixed-target data for the Drell-Yan process and includes, for the
first time, data from the Large Hadron Collider (LHC) for the Drell-Yan process
and the hadro-production of top-quark pairs. The analysis applies the
fixed-flavor number scheme for n_f=3,4,5, uses the MS-bar scheme for the strong
coupling \alpha_s and the heavy-quark masses and keeps full account of the
correlations among all non-perturbative parameters. At NNLO this returns the
values of \alpha_s(M_Z) = 0.1132 +- 0.0011 and m_t(pole) = 171.2 +- 2.4 GeV for
the top-quark pole mass.The fit results are used to compute benchmark cross
sections for Higgs production at the LHC to NNLO accuracy. We compare our
results to those obtained by other groups and show that differences can be
linked to different theoretical descriptions of the underlying physical
processes.
| [
{
"created": "Fri, 11 Oct 2013 09:17:48 GMT",
"version": "v1"
}
] | 2014-04-02 | [
[
"Alekhin",
"S.",
""
],
[
"Bluemlein",
"J.",
""
],
[
"Moch",
"S.",
""
]
] | We present a global fit of parton distributions at next-to-next-to-leading order (NNLO) in QCD. The fit is based on the world data for deep-inelastic scattering, fixed-target data for the Drell-Yan process and includes, for the first time, data from the Large Hadron Collider (LHC) for the Drell-Yan process and the hadro-production of top-quark pairs. The analysis applies the fixed-flavor number scheme for n_f=3,4,5, uses the MS-bar scheme for the strong coupling \alpha_s and the heavy-quark masses and keeps full account of the correlations among all non-perturbative parameters. At NNLO this returns the values of \alpha_s(M_Z) = 0.1132 +- 0.0011 and m_t(pole) = 171.2 +- 2.4 GeV for the top-quark pole mass.The fit results are used to compute benchmark cross sections for Higgs production at the LHC to NNLO accuracy. We compare our results to those obtained by other groups and show that differences can be linked to different theoretical descriptions of the underlying physical processes. |
1302.6433 | Cyrille Marquet | Javier L. Albacete, Adrian Dumitru and Cyrille Marquet | The initial state of heavy-ion collisions | 31 pages, 10 figures, Invited review to appear in a special issue of
IJMPA | Int. J. Mod. Phys. A 28, 1340010 (2013) | 10.1142/S0217751X13400101 | RBRC 1001 | hep-ph nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present a brief review of recent theoretical developments and related
phenomenological approaches for understanding the initial state of heavy-ion
collisions, with emphasis on the Color Glass Condensate formalism.
| [
{
"created": "Tue, 26 Feb 2013 13:52:30 GMT",
"version": "v1"
}
] | 2013-05-03 | [
[
"Albacete",
"Javier L.",
""
],
[
"Dumitru",
"Adrian",
""
],
[
"Marquet",
"Cyrille",
""
]
] | We present a brief review of recent theoretical developments and related phenomenological approaches for understanding the initial state of heavy-ion collisions, with emphasis on the Color Glass Condensate formalism. |
1605.04935 | Lucian Harland-Lang | L. A. Harland-Lang, M. G. Ryskin, V. A. Khoze | Sudakov effects in photon-initiated processes | 11 pages, 2 figures | null | 10.1016/j.physletb.2016.08.004 | IPPP/16/35 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We consider the effect of the Sudakov factor in photon-initiated processes,
corresponding to the no branching probability for the initial-state photon. We
demonstrate how such a factor follows simply from the solution of the DGLAP
equation for the photon PDF, and is therefore included automatically by this.
We use this result to argue that the appropriate scale for the QED coupling
$\alpha$ associated with an initial-state photon is not the virtuality of the
photon, but rather the factorization scale at which the photon PDF is
evaluated, and therefore that the use of the on-shell renormalization scheme is
not appropriate for such processes. We also discuss exclusive photon-initiated
processes, and demonstrate that no explicit Sudakov factor is required in this
case.
| [
{
"created": "Mon, 16 May 2016 20:30:03 GMT",
"version": "v1"
}
] | 2016-09-21 | [
[
"Harland-Lang",
"L. A.",
""
],
[
"Ryskin",
"M. G.",
""
],
[
"Khoze",
"V. A.",
""
]
] | We consider the effect of the Sudakov factor in photon-initiated processes, corresponding to the no branching probability for the initial-state photon. We demonstrate how such a factor follows simply from the solution of the DGLAP equation for the photon PDF, and is therefore included automatically by this. We use this result to argue that the appropriate scale for the QED coupling $\alpha$ associated with an initial-state photon is not the virtuality of the photon, but rather the factorization scale at which the photon PDF is evaluated, and therefore that the use of the on-shell renormalization scheme is not appropriate for such processes. We also discuss exclusive photon-initiated processes, and demonstrate that no explicit Sudakov factor is required in this case. |
hep-ph/9809416 | Xin He Meng | Xin He Meng | Allowed parameter regions for a general inflation moded | 5 figs, Latex | Commun.Theor.Phys. 35 (2001) 125-128 | null | null | hep-ph | null | The early Universe inflation is well known as a promising theory to explain
the origin of large scale structure of Universe and to solve the early universe
pressing problems. For a resonable inflation model, the potential during
inflation must be very flat in, at least, the direction of the inflaton. To
construct the inflaton potential all the known related astrophysics
observations should be included. For a general tree-level hybrid inflation
potential, which is not discussed fully so far, the parameters in it are shown
how to be constrained via the astrophysics data observed and to be obtained to
the expected accuracy, and consistent cosmology requirements.
| [
{
"created": "Wed, 16 Sep 1998 15:59:49 GMT",
"version": "v1"
},
{
"created": "Thu, 17 Sep 1998 15:44:18 GMT",
"version": "v2"
}
] | 2007-05-23 | [
[
"Meng",
"Xin He",
""
]
] | The early Universe inflation is well known as a promising theory to explain the origin of large scale structure of Universe and to solve the early universe pressing problems. For a resonable inflation model, the potential during inflation must be very flat in, at least, the direction of the inflaton. To construct the inflaton potential all the known related astrophysics observations should be included. For a general tree-level hybrid inflation potential, which is not discussed fully so far, the parameters in it are shown how to be constrained via the astrophysics data observed and to be obtained to the expected accuracy, and consistent cosmology requirements. |
hep-ph/9507428 | null | Edmond L. Berger, Xiaofeng Guo, and Jianwei Qiu | Inclusive Prompt Photon Production in Hadronic Final States of $e^+e^-$
Annihilation | 40 pages, RevTex, 30 figures in postscript available in a separate
file | Phys.Rev. D53 (1996) 1124-1141 | 10.1103/PhysRevD.53.1124 | ANL-HEP-PR-94-74 | hep-ph | null | We provide complete analytic expressions for the inclusive prompt photon
production cross section in hadronic final states of $e^+e^-$ annihilation
reactions through one-loop order in quantum chromodynamics perturbation theory.
Computed explicitly are direct photon production through first order in the
electromagnetic strength $\alpha_{em}$ and the quark-to-photon and
gluon-to-photon fragmentation contributions through first order in the strong
coupling $\alpha_s$. The full angular dependence of the cross sections is
displayed, separated into transverse $(1 +\cos ^2\theta _\gamma)$ and
longitudinal $(\sin ^2\theta_\gamma)$ components, where $\theta_\gamma$
specifies the direction of the photon with respect to the $e^+e^-$ collision
axis. We discuss extraction of fragmentation functions from $e^+e^-$ data.
| [
{
"created": "Wed, 26 Jul 1995 21:35:48 GMT",
"version": "v1"
},
{
"created": "Thu, 27 Jul 1995 19:37:38 GMT",
"version": "v2"
},
{
"created": "Sat, 29 Jul 1995 10:34:39 GMT",
"version": "v3"
}
] | 2009-10-28 | [
[
"Berger",
"Edmond L.",
""
],
[
"Guo",
"Xiaofeng",
""
],
[
"Qiu",
"Jianwei",
""
]
] | We provide complete analytic expressions for the inclusive prompt photon production cross section in hadronic final states of $e^+e^-$ annihilation reactions through one-loop order in quantum chromodynamics perturbation theory. Computed explicitly are direct photon production through first order in the electromagnetic strength $\alpha_{em}$ and the quark-to-photon and gluon-to-photon fragmentation contributions through first order in the strong coupling $\alpha_s$. The full angular dependence of the cross sections is displayed, separated into transverse $(1 +\cos ^2\theta _\gamma)$ and longitudinal $(\sin ^2\theta_\gamma)$ components, where $\theta_\gamma$ specifies the direction of the photon with respect to the $e^+e^-$ collision axis. We discuss extraction of fragmentation functions from $e^+e^-$ data. |
0910.4142 | Arlene Cristina Aguilar | Arlene C. Aguilar and Joannis Papavassiliou | Gluon mass generation without seagull divergences | 37 pages, 9 figures; minor typos corrected and a few brief
explanatory remarks added | Phys.Rev.D81:034003,2010 | 10.1103/PhysRevD.81.034003 | null | hep-ph hep-lat hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Dynamical gluon mass generation has been traditionally plagued with seagull
divergences, and all regularization procedures proposed over the years yield
finite but scheme-dependent gluon masses. In this work we show how such
divergences can be eliminated completely by virtue of a characteristic
identity, valid in dimensional regularization. The ability to trigger the
aforementioned identity hinges crucially on the particular Ansatz employed for
the three-gluon vertex entering into the Schwinger-Dyson equation governing the
gluon propagator. The use of the appropriate three-gluon vertex brings about an
additional advantage: one obtains two separate (but coupled) integral
equations, one for the effective charge and one for the gluon mass. This system
of integral equations has a unique solution, which unambiguously determines
these two quantities. Most notably, the effective charge freezes in the
infrared, and the gluon mass displays power-law running in the ultraviolet, in
agreement with earlier considerations.
| [
{
"created": "Wed, 21 Oct 2009 18:03:27 GMT",
"version": "v1"
},
{
"created": "Fri, 30 Oct 2009 13:44:27 GMT",
"version": "v2"
}
] | 2014-11-20 | [
[
"Aguilar",
"Arlene C.",
""
],
[
"Papavassiliou",
"Joannis",
""
]
] | Dynamical gluon mass generation has been traditionally plagued with seagull divergences, and all regularization procedures proposed over the years yield finite but scheme-dependent gluon masses. In this work we show how such divergences can be eliminated completely by virtue of a characteristic identity, valid in dimensional regularization. The ability to trigger the aforementioned identity hinges crucially on the particular Ansatz employed for the three-gluon vertex entering into the Schwinger-Dyson equation governing the gluon propagator. The use of the appropriate three-gluon vertex brings about an additional advantage: one obtains two separate (but coupled) integral equations, one for the effective charge and one for the gluon mass. This system of integral equations has a unique solution, which unambiguously determines these two quantities. Most notably, the effective charge freezes in the infrared, and the gluon mass displays power-law running in the ultraviolet, in agreement with earlier considerations. |
0907.0637 | Marco Picariello | M. Picariello, B.C. Chauhan, C.R. Das, Fernandez-Melgarejo, D.
Montanino, J. Pulido, E. Torrente-Lujan | Neutrino Dipole Moments and Solar Experiments | Contribution to the 44th Rencontres de Moriond in the Electroweak 09.
6 pages, 6 figure, moriond.sty included | null | null | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | First we investigate the possibility of detecting solar antineutrinos with
the KamLAND experiment. Then we analyze the first Borexino data release to
constrain the neutrino magnetic moment. Finally we investigate the resonant
spin flavour conversion of solar neutrinos to sterile ones, a mechanism which
is added to the well known LMA one. In this last condition, we show that the
data from all solar neutrino experiments except Borexino exhibit a clear
preference for a sizable magnetic field. We argue that the solar neutrino
experiments are capable of tracing the possible modulation of the solar
magnetic field. In this way Borexino alone may play an essential role although
experimental redundancy from other experiments will be most important.
| [
{
"created": "Fri, 3 Jul 2009 13:56:10 GMT",
"version": "v1"
}
] | 2009-07-06 | [
[
"Picariello",
"M.",
""
],
[
"Chauhan",
"B. C.",
""
],
[
"Das",
"C. R.",
""
],
[
"Fernandez-Melgarejo",
"",
""
],
[
"Montanino",
"D.",
""
],
[
"Pulido",
"J.",
""
],
[
"Torrente-Lujan",
"E.",
""
]
] | First we investigate the possibility of detecting solar antineutrinos with the KamLAND experiment. Then we analyze the first Borexino data release to constrain the neutrino magnetic moment. Finally we investigate the resonant spin flavour conversion of solar neutrinos to sterile ones, a mechanism which is added to the well known LMA one. In this last condition, we show that the data from all solar neutrino experiments except Borexino exhibit a clear preference for a sizable magnetic field. We argue that the solar neutrino experiments are capable of tracing the possible modulation of the solar magnetic field. In this way Borexino alone may play an essential role although experimental redundancy from other experiments will be most important. |
1011.0152 | Bo Xiao | Bo Xiao, You-kai Wang, Shou-hua Zhu | New Color-Octet Vector Boson? | 4 pages, 3 figures, 1 table | null | null | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Both CDF and D0 at Tevatron reported the measurements of forward-backward
asymmetry in top pair production, which showed possible deviation from the
standard model QCD prediction. In this paper, we show that a new color-octet
massive vector boson with mass just above twice that of top quark can
simultaneously account for the asymmetry and differential distribution
$d\sigma/dM_{t\bar t}$ in top pair production, without conflict with other
measurements for example di-jet production. The new particle can be discovered
and studied at the more powerful Large Hadron Collider.
| [
{
"created": "Sun, 31 Oct 2010 12:54:06 GMT",
"version": "v1"
}
] | 2010-11-02 | [
[
"Xiao",
"Bo",
""
],
[
"Wang",
"You-kai",
""
],
[
"Zhu",
"Shou-hua",
""
]
] | Both CDF and D0 at Tevatron reported the measurements of forward-backward asymmetry in top pair production, which showed possible deviation from the standard model QCD prediction. In this paper, we show that a new color-octet massive vector boson with mass just above twice that of top quark can simultaneously account for the asymmetry and differential distribution $d\sigma/dM_{t\bar t}$ in top pair production, without conflict with other measurements for example di-jet production. The new particle can be discovered and studied at the more powerful Large Hadron Collider. |
2311.02150 | John Terry | Shen Fang, Weiyao Ke, Ding Yu Shao, and John Terry | Precision three-dimensional imaging of nuclei using recoil-free jets | 23 pages, 4 figures; v2: fixed language typos and added journal
reference | JHEP05(2024)066 | null | LA-UR-23-30764 | hep-ph hep-ex nucl-ex nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this study, we explore the azimuthal angle decorrelation of lepton-jet
pairs in e-p and e-A collisions as a means for precision measurements of the
three-dimensional structure of bound and free nucleons. Utilizing
soft-collinear effective theory, we perform the first-ever resummation of this
process in e-p collisions at NNLL accuracy using a recoil-free jet axis. Our
results are validated against Pythia simulations. In e-A collisions, we address
the complex interplay between three characteristic length scales: the medium
length $L$, the mean free path of the energetic parton in the medium $\lambda$,
and the hadronization length $L_h$. We demonstrate that in the thin-dilute
limit, where $L \ll L_h$ and $L \sim \lambda$, this process can serve as a
robust probe of the three-dimensional structure for bound nucleons. We conclude
by offering predictions for future experiments at the Electron-Ion Collider
within this limit.
| [
{
"created": "Fri, 3 Nov 2023 18:00:00 GMT",
"version": "v1"
},
{
"created": "Wed, 15 May 2024 16:07:55 GMT",
"version": "v2"
}
] | 2024-05-16 | [
[
"Fang",
"Shen",
""
],
[
"Ke",
"Weiyao",
""
],
[
"Shao",
"Ding Yu",
""
],
[
"Terry",
"John",
""
]
] | In this study, we explore the azimuthal angle decorrelation of lepton-jet pairs in e-p and e-A collisions as a means for precision measurements of the three-dimensional structure of bound and free nucleons. Utilizing soft-collinear effective theory, we perform the first-ever resummation of this process in e-p collisions at NNLL accuracy using a recoil-free jet axis. Our results are validated against Pythia simulations. In e-A collisions, we address the complex interplay between three characteristic length scales: the medium length $L$, the mean free path of the energetic parton in the medium $\lambda$, and the hadronization length $L_h$. We demonstrate that in the thin-dilute limit, where $L \ll L_h$ and $L \sim \lambda$, this process can serve as a robust probe of the three-dimensional structure for bound nucleons. We conclude by offering predictions for future experiments at the Electron-Ion Collider within this limit. |
1407.6123 | Bingfang Yang | Bingfang Yang, Guofa Mi and Ning Liu | Higgs couplings and Naturalness in the littlest Higgs model with
T-parity at the LHC and TLEP | published version (to appear in JHEP) | null | 10.1007/JHEP10(2014)047 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Motivated by the recent LHC Higgs data and null results in searches for any
new physics, we investigate the Higgs couplings and naturalness in the littlest
Higgs model with T-parity. By performing the global fit of the latest Higgs
data, electroweak precise observables and $R_{b}$ measurements, we find that
the scale $f$ can be excluded up to 600 GeV at $2\sigma$ confidence level. The
expected Higgs coupling measurements at the future collider TLEP will improve
this lower limit to above 3 TeV. Besides, the top parnter mass $m_{T_{+}}$ can
be excluded up to 880 GeV at $2\sigma$ confidence level. The future HL-LHC can
constrain this mass in the region $m_{T_{+}} < 2.2$ TeV corresponding to the
fine-tuning being lager than 1%.
| [
{
"created": "Wed, 23 Jul 2014 08:01:25 GMT",
"version": "v1"
},
{
"created": "Mon, 22 Sep 2014 12:45:26 GMT",
"version": "v2"
},
{
"created": "Tue, 23 Sep 2014 13:53:51 GMT",
"version": "v3"
}
] | 2015-06-22 | [
[
"Yang",
"Bingfang",
""
],
[
"Mi",
"Guofa",
""
],
[
"Liu",
"Ning",
""
]
] | Motivated by the recent LHC Higgs data and null results in searches for any new physics, we investigate the Higgs couplings and naturalness in the littlest Higgs model with T-parity. By performing the global fit of the latest Higgs data, electroweak precise observables and $R_{b}$ measurements, we find that the scale $f$ can be excluded up to 600 GeV at $2\sigma$ confidence level. The expected Higgs coupling measurements at the future collider TLEP will improve this lower limit to above 3 TeV. Besides, the top parnter mass $m_{T_{+}}$ can be excluded up to 880 GeV at $2\sigma$ confidence level. The future HL-LHC can constrain this mass in the region $m_{T_{+}} < 2.2$ TeV corresponding to the fine-tuning being lager than 1%. |
1408.3156 | Adam Bzdak | Adam Bzdak, Vladimir Skokov, Stefan Bathe | Centrality dependence of high energy jets in p+Pb collisions at the LHC | 5 pages, 4 figures; extended discussion, comparison with data added | Phys. Rev. C 93, 044901 (2016) | 10.1103/PhysRevC.93.044901 | null | hep-ph hep-ex nucl-ex nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The recently measured centrality dependence of high energy jets in
proton-lead collisions at the LHC is investigated. We hypothesize that events
with jets of very high energy (a few hundred GeV) are characterized by a
suppressed number of soft particles, thus shifting these events into more
peripheral bins. This naturally results in the suppression (enhancement) of the
nuclear modification factor, $R_{pA}$, in central (peripheral) collisions. Our
calculations suggest that a moderate suppression of the order of $20\%$, for
$10^{3}$ GeV jets, can quantitatively reproduce the experimental data. We
further extract the suppression factor as a function of jet energy and test our
conjecture using available $R_{pA}$ data for various centralities.
| [
{
"created": "Wed, 13 Aug 2014 22:28:11 GMT",
"version": "v1"
},
{
"created": "Wed, 16 Sep 2015 16:53:26 GMT",
"version": "v2"
}
] | 2016-04-13 | [
[
"Bzdak",
"Adam",
""
],
[
"Skokov",
"Vladimir",
""
],
[
"Bathe",
"Stefan",
""
]
] | The recently measured centrality dependence of high energy jets in proton-lead collisions at the LHC is investigated. We hypothesize that events with jets of very high energy (a few hundred GeV) are characterized by a suppressed number of soft particles, thus shifting these events into more peripheral bins. This naturally results in the suppression (enhancement) of the nuclear modification factor, $R_{pA}$, in central (peripheral) collisions. Our calculations suggest that a moderate suppression of the order of $20\%$, for $10^{3}$ GeV jets, can quantitatively reproduce the experimental data. We further extract the suppression factor as a function of jet energy and test our conjecture using available $R_{pA}$ data for various centralities. |
0801.0181 | Morimitsu Tanimoto | Mizue Honda and Morimitsu Tanimoto | Deviation from tri-bimaximal neutrino mixing in A4 flavor symmetry | 12 pages, 18 figures, some discussions and references are added | Prog.Theor.Phys.119:583-598,2008 | 10.1143/PTP.119.583 | null | hep-ph | null | The tri-bimaximal mixing is a good approximation for the present data of
neutrino mixing angles. The deviation from the tri-bimaximal mixing is
discussed numerically in the framework of the A4 model. Values of
\tan^2\theta_{12}, \sin^2 2\theta_{23} and |U_{e3}| deviate from the
tri-bimaximal mixing due to the corrections of the vacuum alignment of flavon
fields. It is remarked that \sin^2 2\theta_{23} deviates scarcely from 1 while
\sin^2\theta_{12} can deviate from 1/3 considerably and \sin\theta_{13} could
be near the present experimental upper bound. The CP violating measure J_{CP}
and the effective Majorana neutrino mass m_{ee} are also discussed.
| [
{
"created": "Mon, 31 Dec 2007 03:37:31 GMT",
"version": "v1"
},
{
"created": "Wed, 9 Jan 2008 00:29:04 GMT",
"version": "v2"
}
] | 2008-11-26 | [
[
"Honda",
"Mizue",
""
],
[
"Tanimoto",
"Morimitsu",
""
]
] | The tri-bimaximal mixing is a good approximation for the present data of neutrino mixing angles. The deviation from the tri-bimaximal mixing is discussed numerically in the framework of the A4 model. Values of \tan^2\theta_{12}, \sin^2 2\theta_{23} and |U_{e3}| deviate from the tri-bimaximal mixing due to the corrections of the vacuum alignment of flavon fields. It is remarked that \sin^2 2\theta_{23} deviates scarcely from 1 while \sin^2\theta_{12} can deviate from 1/3 considerably and \sin\theta_{13} could be near the present experimental upper bound. The CP violating measure J_{CP} and the effective Majorana neutrino mass m_{ee} are also discussed. |
hep-ph/9602325 | null | Zurab Berezhiani | Fermion Masses and Mixing in SUSY GUT | 36 pages, Latex | null | null | INFN-FE 21/95 | hep-ph | null | The problem of fermion masses and mixings is discussed in the context of
supersymmetric grand unification theories. Some predictive frameworks based on
the $SU(5)$, $SO(10)$ and $SU(6)$ models are reviewed. [Based on lectures
delivered at the ICTP Summer School on `High Energy Physics and Cosmology',
Trieste, Italy, 3-28 July 1995 (to appear on Proceedings), and XIX Int.
Conference on {\em Particle Physics and Astrophysics in the Standard Model and
Beyond}, Bystra, Poland, 19-26 September 1995]
| [
{
"created": "Fri, 16 Feb 1996 00:57:08 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Berezhiani",
"Zurab",
""
]
] | The problem of fermion masses and mixings is discussed in the context of supersymmetric grand unification theories. Some predictive frameworks based on the $SU(5)$, $SO(10)$ and $SU(6)$ models are reviewed. [Based on lectures delivered at the ICTP Summer School on `High Energy Physics and Cosmology', Trieste, Italy, 3-28 July 1995 (to appear on Proceedings), and XIX Int. Conference on {\em Particle Physics and Astrophysics in the Standard Model and Beyond}, Bystra, Poland, 19-26 September 1995] |
2012.00017 | Rick Gupta | R.S. Gupta, V.V. Khoze and M. Spannowsky | Small instantons and the strong CP problem in composite Higgs models | 8 pages, 3 figures | Phys. Rev. D 104, 075011 (2021) | 10.1103/PhysRevD.104.075011 | null | hep-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We show that QCD instantons can generate large effects at small length scales
in the ultraviolet in standard composite Higgs models that utilise partial
compositeness. This has important implications for possible solutions of the
strong CP problem in these models. First we show that in the simplest known UV
completions of composite Higgs models, if an axion is also present, it can have
a mass much larger than the usual QCD axion. Even more remarkable is the case
where there are no axions, but the strong CP problem can be solved by
generating the up quark mass entirely from the contribution of instantons thus
reviving the massless up-quark solution for these models. In both cases no
additional field content is required apart from what is required to realise
partial compositeness.
| [
{
"created": "Mon, 30 Nov 2020 19:00:01 GMT",
"version": "v1"
}
] | 2021-10-13 | [
[
"Gupta",
"R. S.",
""
],
[
"Khoze",
"V. V.",
""
],
[
"Spannowsky",
"M.",
""
]
] | We show that QCD instantons can generate large effects at small length scales in the ultraviolet in standard composite Higgs models that utilise partial compositeness. This has important implications for possible solutions of the strong CP problem in these models. First we show that in the simplest known UV completions of composite Higgs models, if an axion is also present, it can have a mass much larger than the usual QCD axion. Even more remarkable is the case where there are no axions, but the strong CP problem can be solved by generating the up quark mass entirely from the contribution of instantons thus reviving the massless up-quark solution for these models. In both cases no additional field content is required apart from what is required to realise partial compositeness. |
2309.05410 | Anna Ershova | Anna Ershova, Kajetan Niewczas, Sara Bolognesi, Alain Letourneau,
Jean-Christophe David, Jos\'e Lu\'is Rodr\'iguez-S\'anchez, Jan Sobczyk,
Adrien Blanchet, Margherita Buizza Avanzini, Jaafar Chakrani, Joseph Cugnon,
Stephen Dolan, Claudio Giganti, Samira Hassani, Jason Hirtz, Shivam Joshi,
Cezary Juszczak, Laura Munteanu, Davide Sgalaberna and Uladzislava
Yevarouskaya | The role of de-excitation in the final-state interactions of protons in
neutrino-nucleus interactions | 14 pages, 13 figures | null | null | null | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Present and next generation of long-baseline accelerator experiments are
bringing the measurement of neutrino oscillations into the precision era with
ever-increasing statistics. One of the most challenging aspects of achieving
such measurements is developing relevant systematic uncertainties in the
modeling of nuclear effects in neutrino-nucleus interactions. To address this
problem, state-of-the-art detectors are being developed to extract detailed
information about all particles produced in neutrino interactions. To fully
profit from these experimental advancements, it is essential to have reliable
models of propagation of the outgoing hadrons through nuclear matter able to
predict how the energy is distributed between all the final-state observed
particles. In this article, we investigate the role of nuclear de-excitation in
neutrino-nucleus scattering using two Monte Carlo cascade models: NuWro and
INCL coupled with the de-excitation code ABLA. The ablation model ABLA is used
here for the first time to model de-excitation in neutrino interactions. As
input to ABLA, we develop a consistent simulation of nuclear excitation energy
tuned to electron-scattering data. The paper includes the characterization of
the leading proton kinematics and of the nuclear cluster production during
cascade and de-excitation. The observability of nuclear clusters as vertex
activity and their role in a precise neutrino energy reconstruction is
quantified.
| [
{
"created": "Mon, 11 Sep 2023 12:21:58 GMT",
"version": "v1"
}
] | 2023-09-12 | [
[
"Ershova",
"Anna",
""
],
[
"Niewczas",
"Kajetan",
""
],
[
"Bolognesi",
"Sara",
""
],
[
"Letourneau",
"Alain",
""
],
[
"David",
"Jean-Christophe",
""
],
[
"Rodríguez-Sánchez",
"José Luís",
""
],
[
"Sobczyk",
"Ja... | Present and next generation of long-baseline accelerator experiments are bringing the measurement of neutrino oscillations into the precision era with ever-increasing statistics. One of the most challenging aspects of achieving such measurements is developing relevant systematic uncertainties in the modeling of nuclear effects in neutrino-nucleus interactions. To address this problem, state-of-the-art detectors are being developed to extract detailed information about all particles produced in neutrino interactions. To fully profit from these experimental advancements, it is essential to have reliable models of propagation of the outgoing hadrons through nuclear matter able to predict how the energy is distributed between all the final-state observed particles. In this article, we investigate the role of nuclear de-excitation in neutrino-nucleus scattering using two Monte Carlo cascade models: NuWro and INCL coupled with the de-excitation code ABLA. The ablation model ABLA is used here for the first time to model de-excitation in neutrino interactions. As input to ABLA, we develop a consistent simulation of nuclear excitation energy tuned to electron-scattering data. The paper includes the characterization of the leading proton kinematics and of the nuclear cluster production during cascade and de-excitation. The observability of nuclear clusters as vertex activity and their role in a precise neutrino energy reconstruction is quantified. |
1002.0816 | Duc Ninh Le | Fawzi Boudjema, Le Duc Ninh, Sun Hao, Marcus M. Weber | Electroweak corrections to WWZ and ZZZ production at the linear collider | 5 pages, 2 figs, contribution to the Corfu 2009 proceedings | null | 10.1002/prop.201000023 | MPP-2010-15, LAPTH-004/10 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We calculate the electroweak corrections to the production of WWZ and ZZZ at
the linear collider in the Standard Model. These processes are important for
the extraction of the quartic couplings of the massive gauge bosons which can
be a window on the mechanism of spontaneous symmetry breaking. We find that the
weak corrections to some kinematic distributions show new features and hence
cannot be explained by an overall scale factor.
| [
{
"created": "Wed, 3 Feb 2010 18:36:38 GMT",
"version": "v1"
}
] | 2015-05-18 | [
[
"Boudjema",
"Fawzi",
""
],
[
"Ninh",
"Le Duc",
""
],
[
"Hao",
"Sun",
""
],
[
"Weber",
"Marcus M.",
""
]
] | We calculate the electroweak corrections to the production of WWZ and ZZZ at the linear collider in the Standard Model. These processes are important for the extraction of the quartic couplings of the massive gauge bosons which can be a window on the mechanism of spontaneous symmetry breaking. We find that the weak corrections to some kinematic distributions show new features and hence cannot be explained by an overall scale factor. |
2005.08786 | Yan-Qing Ma | An-Ping Chen, Yan-Qing Ma | Theory for quarkonium: from NRQCD factorization to soft gluon
factorization | 15 pages, 1 figure | null | 10.1088/1674-1137/abc683 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We demonstrate that the recently proposed soft gluon factorization (SGF) is
equivalent to the nonrelativistic QCD (NRQCD) factorization for heavy
quarkonium production or decay, which means that for any given process these
two factorization theories are either both valid or both violated. We use two
methods to achieve this conclusion. In the first method, we apply the two
factorization theories to the physical process $J/\psi \to e^+e^-$. Our
explicit calculation shows that both SGF and NRQCD can correctly reproduce low
energy physics of full QCD, and thus the two factorizations are equivalent. In
the second method, by using equations of motion we successfully deduce SGF from
NRQCD effective field theory. By identifying SGF with NRQCD factorization, we
establish relations between the two factorization theories and prove the
generalized Gremm-Kapustin relations as a by product. Comparing with the NRQCD
factorization, the advantage of SGF is that it resums the series of
relativistic corrections originated from kinematic effects to all powers, which
gives rise to a better convergence in relativistic expansion.
| [
{
"created": "Mon, 18 May 2020 15:05:15 GMT",
"version": "v1"
}
] | 2021-02-03 | [
[
"Chen",
"An-Ping",
""
],
[
"Ma",
"Yan-Qing",
""
]
] | We demonstrate that the recently proposed soft gluon factorization (SGF) is equivalent to the nonrelativistic QCD (NRQCD) factorization for heavy quarkonium production or decay, which means that for any given process these two factorization theories are either both valid or both violated. We use two methods to achieve this conclusion. In the first method, we apply the two factorization theories to the physical process $J/\psi \to e^+e^-$. Our explicit calculation shows that both SGF and NRQCD can correctly reproduce low energy physics of full QCD, and thus the two factorizations are equivalent. In the second method, by using equations of motion we successfully deduce SGF from NRQCD effective field theory. By identifying SGF with NRQCD factorization, we establish relations between the two factorization theories and prove the generalized Gremm-Kapustin relations as a by product. Comparing with the NRQCD factorization, the advantage of SGF is that it resums the series of relativistic corrections originated from kinematic effects to all powers, which gives rise to a better convergence in relativistic expansion. |
1003.0867 | Dae Sung Hwang | Dae Sung Hwang | Light-Cone Wavefunction Representations of Sivers and Boer-Mulders
Distribution Functions | 11 pages, 4 figures | null | null | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We find the light-cone wavefunction representations of the Sivers and
Boer-Mulders distribution functions. A necessary condition for the existence of
these representations is that the light-cone wavefunctions have complex phases.
We induce the complex phases by incorporating the final-state interactions into
the light-cone wavefunctions. For the scalar and axial-vector diquark models
for nucleon, we calculate explicitly the Sivers and Boer-Mulders distribution
functions from the light-cone wavefunction representations. We obtain the
results that the Sivers distribution function has the opposite signs with the
factor 3 difference in magnitude for the two models, whereas the Boer-Mulders
distribution function has the same sign and magnitude. We can understand these
results from the properties of the light-cone wavefunction representations of
the Sivers and Boer-Mulders distribution functions.
| [
{
"created": "Wed, 3 Mar 2010 17:33:56 GMT",
"version": "v1"
}
] | 2010-03-04 | [
[
"Hwang",
"Dae Sung",
""
]
] | We find the light-cone wavefunction representations of the Sivers and Boer-Mulders distribution functions. A necessary condition for the existence of these representations is that the light-cone wavefunctions have complex phases. We induce the complex phases by incorporating the final-state interactions into the light-cone wavefunctions. For the scalar and axial-vector diquark models for nucleon, we calculate explicitly the Sivers and Boer-Mulders distribution functions from the light-cone wavefunction representations. We obtain the results that the Sivers distribution function has the opposite signs with the factor 3 difference in magnitude for the two models, whereas the Boer-Mulders distribution function has the same sign and magnitude. We can understand these results from the properties of the light-cone wavefunction representations of the Sivers and Boer-Mulders distribution functions. |
0705.1089 | Jae Sik Lee | Jae Sik Lee | Probing Higgs-sector CP Violation at a Photon Collider | 18 pages, 8 figures, 1 table, invited article by Modern Physics
Letters A (review section), added references | Mod.Phys.Lett.A22:1191-1208,2007 | 10.1142/S0217732307023717 | null | hep-ph | null | In this review we demonstrate physics potential of a photon linear collider
by studying the neutral Higgs-boson sector of the MSSM in which interesting
CP-violating Higgs mixing could arise via radiative corrections.
| [
{
"created": "Tue, 8 May 2007 13:28:06 GMT",
"version": "v1"
},
{
"created": "Wed, 16 May 2007 13:21:52 GMT",
"version": "v2"
}
] | 2008-11-26 | [
[
"Lee",
"Jae Sik",
""
]
] | In this review we demonstrate physics potential of a photon linear collider by studying the neutral Higgs-boson sector of the MSSM in which interesting CP-violating Higgs mixing could arise via radiative corrections. |
hep-ph/9506408 | Ralf Hempfling | Ralf Hempfling | Supersymmetry at Present and Future Colliders | 7 pages, LATEX, uses world-sci.sty file required ; talk given at the
Ringberg Workshop ``Dark Matter in the Universe'', Ringberg, Germany, Mar.
6-10, 1995, to appear in the proceedings | null | null | MPI-PhT/95-56 | hep-ph | null | The theoretical expectations for the supersymmetric particle spectrum is
reviewed and a brief overview on present constraints on supersymmetric models
from collider experiments is presented. Finally, we discuss the discovery
potential of future collider experiments.
| [
{
"created": "Fri, 23 Jun 1995 14:04:59 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Hempfling",
"Ralf",
""
]
] | The theoretical expectations for the supersymmetric particle spectrum is reviewed and a brief overview on present constraints on supersymmetric models from collider experiments is presented. Finally, we discuss the discovery potential of future collider experiments. |
2203.16651 | Vladimir Skokov | Fabian Rennecke and Vladimir V. Skokov | Universal location of Yang-Lee edge singularity for a one-component
field theory in $1\le d \le 4$ | 42 pages, 4 figures, 2 tables; version accepted for publication | Annals of Physics, 444 (2022), 169010 | 10.1016/j.aop.2022.169010 | null | hep-ph cond-mat.stat-mech | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We determine the universal location of the Yang-Lee edge singularity in the
entire relevant domain of spatial dimensions $1\le d \le 4$ for the Ising
universality class. To that end, we present analytical results for $d=1,2,4$
and near four dimensions. For $d=3$ and a set of fractional dimensions, we
perform numerical calculations using a systematic Functional Renormalization
Group approach.
| [
{
"created": "Wed, 30 Mar 2022 20:09:00 GMT",
"version": "v1"
},
{
"created": "Thu, 21 Jul 2022 19:20:57 GMT",
"version": "v2"
}
] | 2022-07-25 | [
[
"Rennecke",
"Fabian",
""
],
[
"Skokov",
"Vladimir V.",
""
]
] | We determine the universal location of the Yang-Lee edge singularity in the entire relevant domain of spatial dimensions $1\le d \le 4$ for the Ising universality class. To that end, we present analytical results for $d=1,2,4$ and near four dimensions. For $d=3$ and a set of fractional dimensions, we perform numerical calculations using a systematic Functional Renormalization Group approach. |
hep-ph/9606326 | Jerry Franklin | Jerrold Franklin | Mixing of Xi_c and Xi_c' Baryons | One missprint corrected. The numerator of Eq. (12) should read
{2[(Sigma_c^{*++}-Sigma_c^{++})-(Xi_c^{*+}-Xi_c^{'+})]} The correct equation
was used in the calculation so no other change is made | Phys.Rev. D55 (1997) 425-426 | 10.1103/PhysRevD.55.425 | TUHE9661 | hep-ph | null | The mixing angle between the Xi_c and Xi_c' baryons is shown to be small,
with a negligible shift in the Xi_c masses.
| [
{
"created": "Thu, 13 Jun 1996 19:59:05 GMT",
"version": "v1"
},
{
"created": "Mon, 17 Jun 1996 00:34:57 GMT",
"version": "v2"
},
{
"created": "Mon, 17 Jun 1996 11:34:40 GMT",
"version": "v3"
}
] | 2009-10-28 | [
[
"Franklin",
"Jerrold",
""
]
] | The mixing angle between the Xi_c and Xi_c' baryons is shown to be small, with a negligible shift in the Xi_c masses. |
1706.08945 | Ilaria Brivio | Ilaria Brivio and Michael Trott | The Standard Model as an Effective Field Theory | Version accepted by Physics Reports. Sections on the EFT landscape
and the method of regions added. Typos fixed | Phys. Rept. 793 (2019) 1-98 | 10.1016/j.physrep.2018.11.002 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Projecting measurements of the interactions of the known Standard Model (SM)
states into an effective field theory (EFT) framework is an important goal of
the LHC physics program. The interpretation of measurements of the properties
of the Higgs-like boson in an EFT allows one to consistently study the
properties of this state, while the SM is allowed to eventually break down at
higher energies. In this review, basic concepts relevant to the construction of
such EFTs are reviewed pedagogically. Electroweak precision data is discussed
as a historical example of some importance to illustrate critical consistency
issues in interpreting experimental data in EFTs. A future precision Higgs
phenomenology program can benefit from the projection of raw experimental
results into consistent field theories such as the SM, the SM supplemented with
higher dimensional operators (the SMEFT) or an Electroweak chiral Lagrangian
with a dominantly $J^P = 0^+$ scalar (the HEFT). We discuss the developing
SMEFT and HEFT approaches, that are consistent versions of such EFTs,
systematically improvable with higher order corrections, and comment on the
pseudo-observable approach. We review the challenges that have been overcome in
developing EFT methods for LHC studies, and the challenges that remain.
| [
{
"created": "Tue, 27 Jun 2017 17:17:52 GMT",
"version": "v1"
},
{
"created": "Tue, 9 Jan 2018 20:21:26 GMT",
"version": "v2"
},
{
"created": "Mon, 12 Nov 2018 14:43:11 GMT",
"version": "v3"
}
] | 2019-02-19 | [
[
"Brivio",
"Ilaria",
""
],
[
"Trott",
"Michael",
""
]
] | Projecting measurements of the interactions of the known Standard Model (SM) states into an effective field theory (EFT) framework is an important goal of the LHC physics program. The interpretation of measurements of the properties of the Higgs-like boson in an EFT allows one to consistently study the properties of this state, while the SM is allowed to eventually break down at higher energies. In this review, basic concepts relevant to the construction of such EFTs are reviewed pedagogically. Electroweak precision data is discussed as a historical example of some importance to illustrate critical consistency issues in interpreting experimental data in EFTs. A future precision Higgs phenomenology program can benefit from the projection of raw experimental results into consistent field theories such as the SM, the SM supplemented with higher dimensional operators (the SMEFT) or an Electroweak chiral Lagrangian with a dominantly $J^P = 0^+$ scalar (the HEFT). We discuss the developing SMEFT and HEFT approaches, that are consistent versions of such EFTs, systematically improvable with higher order corrections, and comment on the pseudo-observable approach. We review the challenges that have been overcome in developing EFT methods for LHC studies, and the challenges that remain. |
1412.2765 | Enrico Bertuzzo Prof. | Enrico Bertuzzo and Claudia Frugiuele | A natural SM-like 126 GeV Higgs via non-decoupling D-terms | 20 pages, 3 figures; v2: clarifications and one appendix added,
version published in PRD | Phys. Rev. D 93, 035019 (2016) | 10.1103/PhysRevD.93.035019 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Accommodating both a 126 GeV mass and Standard Model (SM) like couplings for
the Higgs has a fine tuning price in supersymmetric models. Examples are the
MSSM, in which SM-like couplings are natural, but raising the Higgs mass up to
126 GeV requires a considerable tuning, or the NMSSM, in which the situation is
reversed: the Higgs is naturally heavier, but being SM-like requires some
tuning. We show that models with non-decoupling D-terms alleviate this tension
- a 126 GeV SM-like Higgs comes out basically with no fine tuning cost. In
addition, the analysis of the fine tuning of the extended gauge sector shows
that naturalness requires the heavy gauge bosons to likely be within the LHC
run II reach.
| [
{
"created": "Mon, 8 Dec 2014 21:00:16 GMT",
"version": "v1"
},
{
"created": "Mon, 22 Feb 2016 18:40:36 GMT",
"version": "v2"
}
] | 2016-02-24 | [
[
"Bertuzzo",
"Enrico",
""
],
[
"Frugiuele",
"Claudia",
""
]
] | Accommodating both a 126 GeV mass and Standard Model (SM) like couplings for the Higgs has a fine tuning price in supersymmetric models. Examples are the MSSM, in which SM-like couplings are natural, but raising the Higgs mass up to 126 GeV requires a considerable tuning, or the NMSSM, in which the situation is reversed: the Higgs is naturally heavier, but being SM-like requires some tuning. We show that models with non-decoupling D-terms alleviate this tension - a 126 GeV SM-like Higgs comes out basically with no fine tuning cost. In addition, the analysis of the fine tuning of the extended gauge sector shows that naturalness requires the heavy gauge bosons to likely be within the LHC run II reach. |
2406.16115 | Chen Rui | Li-Cheng Sheng, Jin-Yu Huo, Rui Chen, Fu-Lai Wang, and Xiang Liu | Exploring the mass spectrum and electromagnetic property of the
$\Xi_{cc}K^{(*)}$ and $\Xi_{cc}\bar{K}^{(*)}$ molecules | 11 pages, 5 pages | null | null | null | hep-ph | http://creativecommons.org/licenses/by/4.0/ | Using the one-boson-exchange model, we investigate the interactions between
the doubly charmed baryon $\Xi_{cc}(3621)$ and the $S-$wave (anti-)kaon
accounting for the $S-D$ wave mixing and coupled-channel effects. We find the
coupled $\Xi_{cc}K/\Xi_{cc}K^*$ state with $I(J^P)=0(1/2^-)$, the $\Xi_{cc}K^*$
state with $0(1/2^-)$, the $\Xi_{cc}\bar{K}$ state with $0(1/2^-)$, and the
$\Xi_{cc}\bar{K}^*$ states with $0(1/2^-,3/2^-)$ can be recommended as good
doubly charmed molecular candidates with strangeness $|S|=1$. We further
examine their M1 radiative decay behaviors and magnetic moments within the
constituent quark model framework. This information can enhance our
understanding of their inner structures, including the distribution of electric
charge and the orientation of the constituent quarks' spins.
| [
{
"created": "Sun, 23 Jun 2024 14:05:53 GMT",
"version": "v1"
}
] | 2024-06-25 | [
[
"Sheng",
"Li-Cheng",
""
],
[
"Huo",
"Jin-Yu",
""
],
[
"Chen",
"Rui",
""
],
[
"Wang",
"Fu-Lai",
""
],
[
"Liu",
"Xiang",
""
]
] | Using the one-boson-exchange model, we investigate the interactions between the doubly charmed baryon $\Xi_{cc}(3621)$ and the $S-$wave (anti-)kaon accounting for the $S-D$ wave mixing and coupled-channel effects. We find the coupled $\Xi_{cc}K/\Xi_{cc}K^*$ state with $I(J^P)=0(1/2^-)$, the $\Xi_{cc}K^*$ state with $0(1/2^-)$, the $\Xi_{cc}\bar{K}$ state with $0(1/2^-)$, and the $\Xi_{cc}\bar{K}^*$ states with $0(1/2^-,3/2^-)$ can be recommended as good doubly charmed molecular candidates with strangeness $|S|=1$. We further examine their M1 radiative decay behaviors and magnetic moments within the constituent quark model framework. This information can enhance our understanding of their inner structures, including the distribution of electric charge and the orientation of the constituent quarks' spins. |
1305.6319 | Erik Gerwick | Erik Gerwick | Recursive prescription for logarithmic jet rate coefficients | 18 pages + 1 appendix + 3 references, Published version with extended
discussion and added references. Mathematica notebook implementing the
recursive algorithm included with the submission | Phys. Rev. D 88 (2013) 094009 | 10.1103/PhysRevD.88.094009 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We derive a recursion relation for the analytic leading logarithmic
coefficients of a final state gluon cascade. We demonstrate the potential of
our method by analytically computing the rate coefficients for the emission of
up to 80 gluons in both the exclusive-kT (Durham) and generalized inclusive-kT
class of jet algorithms. There is a particularly simple form for the ratios of
resolved coefficients. We suggest potential applications including the
efficient generation of shower histories.
| [
{
"created": "Mon, 27 May 2013 20:05:17 GMT",
"version": "v1"
},
{
"created": "Tue, 11 Feb 2014 08:32:45 GMT",
"version": "v2"
}
] | 2015-06-16 | [
[
"Gerwick",
"Erik",
""
]
] | We derive a recursion relation for the analytic leading logarithmic coefficients of a final state gluon cascade. We demonstrate the potential of our method by analytically computing the rate coefficients for the emission of up to 80 gluons in both the exclusive-kT (Durham) and generalized inclusive-kT class of jet algorithms. There is a particularly simple form for the ratios of resolved coefficients. We suggest potential applications including the efficient generation of shower histories. |
hep-ph/0606184 | Vadim Naumov | Konstantin S. Kuzmin (Dubna, JINR & Moscow, ITEP), Vladimir V.
Lyubushkin (Dubna, JINR & Irkutsk State U.), Vadim A. Naumov (Dubna, JINR &
INFN, Florence) | Axial masses in quasielastic neutrino scattering and single-pion
neutrinoproduction on nucleons and nuclei | Presented at the XXth Max Born Symposium ``Nuclear effects in
neutrino interactions,'' Wroclaw, Poland, December 7-10, 2005 | ActaPhys.Polon.B37:2337-2348,2006 | null | null | hep-ph hep-ex nucl-ex nucl-th physics.acc-ph | null | We analyse available experimental data on the total charged-current
neutrino-nucleon and antineutrino-nucleon cross sections for quasielastic
scattering and single-pion neutrinoproduction. Published results from the
relevant experiments at ANL, BNL, FNAL, CERN, and IHEP are included dating from
the end of sixties to the present day, covering muon neutrino and antineutrino
beams on a variety of nuclear targets, with energies from the thresholds to
about 350 GeV. The data are used to adjust the poorly known values of the axial
masses.
| [
{
"created": "Sat, 17 Jun 2006 11:18:03 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Kuzmin",
"Konstantin S.",
"",
"Dubna, JINR & Moscow, ITEP"
],
[
"Lyubushkin",
"Vladimir V.",
"",
"Dubna, JINR & Irkutsk State U."
],
[
"Naumov",
"Vadim A.",
"",
"Dubna, JINR &\n INFN, Florence"
]
] | We analyse available experimental data on the total charged-current neutrino-nucleon and antineutrino-nucleon cross sections for quasielastic scattering and single-pion neutrinoproduction. Published results from the relevant experiments at ANL, BNL, FNAL, CERN, and IHEP are included dating from the end of sixties to the present day, covering muon neutrino and antineutrino beams on a variety of nuclear targets, with energies from the thresholds to about 350 GeV. The data are used to adjust the poorly known values of the axial masses. |
1702.05337 | Shunzo Kumano | W. Cosyn, Yu-Bing Dong, S. Kumano, M. Sargsian | Tensor-polarized structure function $b_1$ in the standard convolution
description of the deuteron | 12 pages, 7 eps figures, 3 style files, typos are corrected as
published in Phys. Rev. D 95, 074036 (2017) | null | 10.1103/PhysRevD.95.074036 | KEK-TH-1912, J-PARC-TH-0054 | hep-ph hep-ex hep-lat nucl-ex nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Tensor-polarized structure functions of a spin-1 hadron are additional
observables which do not exist for the spin-1/2 nucleon. They could probe novel
aspects of the internal hadron structure. Twist-2 tensor-polarized structure
functions are $b_1$ and $b_2$, and they are related by the Callan-Gross-like
relation in the Bjorken scaling limit. In this work, we theoretically calculate
$b_1$ in the standard convolution description for the deuteron. Two different
theoretical models, a basic convolution description and a virtual nucleon
approximation, are used for calculating $b_1$ and their results are compared
with the HERMES measurement. We found large differences between our theoretical
results and the data. Although there is still room to improve by considering
higher-twist effects and in the experimental extraction of $b_1$ from the spin
asymmetry $A_{zz}$, there is a possibility that the large differences require
physics beyond the standard deuteron model for their interpretation. Future
$b_1$ studies could shed light on a new field of hadron physics. In particular,
detailed experimental studies of $b_1$ will start soon at the Thomas Jefferson
National Accelerator Facility. In addition, there are possibilities to
investigate tensor-polarized parton distribution functions and $b_1$ at Fermi
National Accelerator Laboratory and a future electron-ion collider. Therefore,
further theoretical studies are needed for understanding the tensor structure
of the spin-1 deuteron, including a new mechanism to explain the large
differences between the current data and our theoretical results.
| [
{
"created": "Fri, 17 Feb 2017 13:37:14 GMT",
"version": "v1"
},
{
"created": "Mon, 3 Apr 2017 19:27:19 GMT",
"version": "v2"
},
{
"created": "Wed, 17 May 2017 09:50:42 GMT",
"version": "v3"
}
] | 2017-05-24 | [
[
"Cosyn",
"W.",
""
],
[
"Dong",
"Yu-Bing",
""
],
[
"Kumano",
"S.",
""
],
[
"Sargsian",
"M.",
""
]
] | Tensor-polarized structure functions of a spin-1 hadron are additional observables which do not exist for the spin-1/2 nucleon. They could probe novel aspects of the internal hadron structure. Twist-2 tensor-polarized structure functions are $b_1$ and $b_2$, and they are related by the Callan-Gross-like relation in the Bjorken scaling limit. In this work, we theoretically calculate $b_1$ in the standard convolution description for the deuteron. Two different theoretical models, a basic convolution description and a virtual nucleon approximation, are used for calculating $b_1$ and their results are compared with the HERMES measurement. We found large differences between our theoretical results and the data. Although there is still room to improve by considering higher-twist effects and in the experimental extraction of $b_1$ from the spin asymmetry $A_{zz}$, there is a possibility that the large differences require physics beyond the standard deuteron model for their interpretation. Future $b_1$ studies could shed light on a new field of hadron physics. In particular, detailed experimental studies of $b_1$ will start soon at the Thomas Jefferson National Accelerator Facility. In addition, there are possibilities to investigate tensor-polarized parton distribution functions and $b_1$ at Fermi National Accelerator Laboratory and a future electron-ion collider. Therefore, further theoretical studies are needed for understanding the tensor structure of the spin-1 deuteron, including a new mechanism to explain the large differences between the current data and our theoretical results. |
1006.5895 | Stephen King | S. F. King | Implications of large CP Violation in B mixing for Supersymmetric
Standard Models | 19 pages, 3 figures, references added, version to appear in JHEP | JHEP 1009:114,2010 | 10.1007/JHEP09(2010)114 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Following the anomalous like-sign dimuon charge asymmetry measured by the D0
collaboration at the Tevatron collider we discuss the implications of large CP
violation in $B_{d,s}$ mixing for Supersymmetric (SUSY) Standard Models,
focussing on those models which allow a family symmetry and unification. For
the Minimal Supersymmetric Standard Model (MSSM) we show that it is only
possible to account for $B_{s}$ mixing and CP violation at the expense of large
squark mixing which would require a new approach to family symmetry models. In
order to describe both $B_{s}$ and $B_{d}$ mixing and CP violation we are led
to consider SUSY models with Higgs fields transforming as triplets under a
family symmetry. We describe a realistic such model based on $\Delta_{27}$
family symmetry in which tree-level exchange of the second Higgs family
predicts $B_{s}$ and $B_{d}$ mixing and CP violation in good agreement with a
recent global fit, while naturally suppressing flavour and CP violation
involving the first and second quark and lepton families.
| [
{
"created": "Wed, 30 Jun 2010 15:58:03 GMT",
"version": "v1"
},
{
"created": "Mon, 5 Jul 2010 08:16:37 GMT",
"version": "v2"
},
{
"created": "Sun, 12 Sep 2010 07:43:37 GMT",
"version": "v3"
}
] | 2014-11-21 | [
[
"King",
"S. F.",
""
]
] | Following the anomalous like-sign dimuon charge asymmetry measured by the D0 collaboration at the Tevatron collider we discuss the implications of large CP violation in $B_{d,s}$ mixing for Supersymmetric (SUSY) Standard Models, focussing on those models which allow a family symmetry and unification. For the Minimal Supersymmetric Standard Model (MSSM) we show that it is only possible to account for $B_{s}$ mixing and CP violation at the expense of large squark mixing which would require a new approach to family symmetry models. In order to describe both $B_{s}$ and $B_{d}$ mixing and CP violation we are led to consider SUSY models with Higgs fields transforming as triplets under a family symmetry. We describe a realistic such model based on $\Delta_{27}$ family symmetry in which tree-level exchange of the second Higgs family predicts $B_{s}$ and $B_{d}$ mixing and CP violation in good agreement with a recent global fit, while naturally suppressing flavour and CP violation involving the first and second quark and lepton families. |
hep-ph/0306211 | Massimiliano Grazzini | S. Catani, D. de Florian, M. Grazzini, P. Nason | Soft-gluon resummation for Higgs boson production at hadron colliders | 44 pages, 17 postscript figures | JHEP 0307 (2003) 028 | 10.1088/1126-6708/2003/07/028 | CERN-TH/2003-117 | hep-ph | null | We consider QCD corrections to Higgs boson production through gluon--gluon
fusion in hadron collisions. We compute the cross section, performing the
all-order resummation of multiple soft-gluon emission at
next-to-next-to-leading logarithmic level. Known fixed-order results (up to
next-to-next-to-leading order) are consistently included in our calculation. We
give phenomenological predictions for Higgs boson production at the Tevatron
and at the LHC. We estimate the residual theoretical uncertainty from
perturbative QCD contributions. We also quantify the differences obtained by
using the presently available sets of parton distributions.
| [
{
"created": "Mon, 23 Jun 2003 12:20:43 GMT",
"version": "v1"
}
] | 2009-11-10 | [
[
"Catani",
"S.",
""
],
[
"de Florian",
"D.",
""
],
[
"Grazzini",
"M.",
""
],
[
"Nason",
"P.",
""
]
] | We consider QCD corrections to Higgs boson production through gluon--gluon fusion in hadron collisions. We compute the cross section, performing the all-order resummation of multiple soft-gluon emission at next-to-next-to-leading logarithmic level. Known fixed-order results (up to next-to-next-to-leading order) are consistently included in our calculation. We give phenomenological predictions for Higgs boson production at the Tevatron and at the LHC. We estimate the residual theoretical uncertainty from perturbative QCD contributions. We also quantify the differences obtained by using the presently available sets of parton distributions. |
1610.02275 | Michael Klasen | T. Jezo, M. Klasen, F. K\"onig | Prompt photon production and photon-hadron jet correlations with POWHEG | 25 pages, 8 figures | null | null | MS-TP-16-23 | hep-ph hep-ex nucl-ex nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present a calculation of direct photon production at next-to-leading order
of QCD and a matching of this calculation with parton showers using POWHEG BOX.
Based on simulations with POWHEG+PYTHIA, we perform a detailed phenomenological
analysis of PHENIX data on prompt photon production and photon-hadron jet
correlations in pp collisions at RHIC, considerably improving the description
of these data with respect to previous calculations, and we suggest additional
interesting analyses.
| [
{
"created": "Fri, 7 Oct 2016 13:30:14 GMT",
"version": "v1"
}
] | 2016-10-10 | [
[
"Jezo",
"T.",
""
],
[
"Klasen",
"M.",
""
],
[
"König",
"F.",
""
]
] | We present a calculation of direct photon production at next-to-leading order of QCD and a matching of this calculation with parton showers using POWHEG BOX. Based on simulations with POWHEG+PYTHIA, we perform a detailed phenomenological analysis of PHENIX data on prompt photon production and photon-hadron jet correlations in pp collisions at RHIC, considerably improving the description of these data with respect to previous calculations, and we suggest additional interesting analyses. |
hep-ph/9704256 | Raman Sundrum | Raman Sundrum (Boston University) | Reparameterization Invariance to all Orders in Heavy Quark Effective
Theory | 12 pages, LaTex. Important and confusing typographical error in eq.
(15) corrected. To appear in Phys. Rev. D | Phys.Rev.D57:331-336,1998 | 10.1103/PhysRevD.57.331 | BUHEP-97-14 | hep-ph | null | Heavy Quark Effective Theory splits a heavy quark momentum into a large fixed
momentum and a variable residual momentum, p = m_Q v + k. It thereby suffers a
redundancy of description corresponding to small changes in the choice of the
fixed velocity, v. The fact that full QCD is manifestly v-independent should
lead to a non-trivial constraint on the form of the effective theory, known as
Reparameterization Invariance. For spin-1/2 quarks, the precise form of the
constraint and its solution at the level of the effective lagrangian have
proven to be rather subtle, and the original proposal by Luke and Manohar has
been questioned. In this paper I employ a version of Heavy Quark Effective
Theory containing the ``anti-particle'' field as a non-propagating auxiliary
field, which greatly simplifies keeping track of v-dependence. This permits a
very simple derivation of Reparameterization Invariance from first principles.
The auxiliary field can also be integrated out to return to the standard
formulation of the effective theory, but with the effective lagrangian now
satisfying the full reparameterization constraint. I compare this result with
earlier proposals.
| [
{
"created": "Mon, 7 Apr 1997 21:35:39 GMT",
"version": "v1"
},
{
"created": "Fri, 17 Oct 1997 22:19:01 GMT",
"version": "v2"
}
] | 2009-09-15 | [
[
"Sundrum",
"Raman",
"",
"Boston University"
]
] | Heavy Quark Effective Theory splits a heavy quark momentum into a large fixed momentum and a variable residual momentum, p = m_Q v + k. It thereby suffers a redundancy of description corresponding to small changes in the choice of the fixed velocity, v. The fact that full QCD is manifestly v-independent should lead to a non-trivial constraint on the form of the effective theory, known as Reparameterization Invariance. For spin-1/2 quarks, the precise form of the constraint and its solution at the level of the effective lagrangian have proven to be rather subtle, and the original proposal by Luke and Manohar has been questioned. In this paper I employ a version of Heavy Quark Effective Theory containing the ``anti-particle'' field as a non-propagating auxiliary field, which greatly simplifies keeping track of v-dependence. This permits a very simple derivation of Reparameterization Invariance from first principles. The auxiliary field can also be integrated out to return to the standard formulation of the effective theory, but with the effective lagrangian now satisfying the full reparameterization constraint. I compare this result with earlier proposals. |
hep-ph/9710472 | null | A.N.Ivanov and N.I.Troitskaya (Vienna Techn.Univ.) | On the $D^+_s \to \pi^+ \pi^+ \pi^-$ - nonresonant decay in the
effective quark model with chiral symmetry | 11 pages, Latex, no figures | Nuovo Cim. A111 (1998) 85-94 | 10.1007/BF03185575 | null | hep-ph | null | The partial widths of the decays $D^+_s \to \phi \pi^+$ and $D^+_s \to \pi^+
\pi^+ \pi^-$ - nonresonant are computed within the effective quark model with
chiral symmetry involving Heavy quark effective theory (HQET) and Chiral
perturbation theory at the quark level (CHPT)$_q$ with linear realization of
chiral U(3) x U(3) symmetry. It is shown that for the explanation of the
experimental probability of the $D^+_s \to \pi^+ \pi^+ \pi^-$ - nonresonant
decay one does not need to use unnaturally heavy light current quarks as has
been suggested in Ref.[1]. The life time of the $D^+_s$ - meson $\tau_{D^+_s} =
(0.59\pm 0.19) x 10^(-12) s$ is computed in good agreement with the
experimental one.
| [
{
"created": "Sat, 25 Oct 1997 11:29:27 GMT",
"version": "v1"
},
{
"created": "Tue, 9 Dec 1997 18:14:26 GMT",
"version": "v2"
}
] | 2022-03-02 | [
[
"Ivanov",
"A. N.",
"",
"Vienna Techn.Univ."
],
[
"Troitskaya",
"N. I.",
"",
"Vienna Techn.Univ."
]
] | The partial widths of the decays $D^+_s \to \phi \pi^+$ and $D^+_s \to \pi^+ \pi^+ \pi^-$ - nonresonant are computed within the effective quark model with chiral symmetry involving Heavy quark effective theory (HQET) and Chiral perturbation theory at the quark level (CHPT)$_q$ with linear realization of chiral U(3) x U(3) symmetry. It is shown that for the explanation of the experimental probability of the $D^+_s \to \pi^+ \pi^+ \pi^-$ - nonresonant decay one does not need to use unnaturally heavy light current quarks as has been suggested in Ref.[1]. The life time of the $D^+_s$ - meson $\tau_{D^+_s} = (0.59\pm 0.19) x 10^(-12) s$ is computed in good agreement with the experimental one. |
1507.06345 | Matthias Jamin | Andrzej J. Buras, Martin Gorbahn, Sebastian J\"ager and Matthias Jamin | Improved anatomy of epsilon'/epsilon in the Standard Model | 32 pages, 2 figures, systematic uncertainty for lattice B_6^(1/2)
included, treatment of isospin breaking improved; some remarks added, version
to appear in JHEP | null | 10.1007/JHEP11(2015)202 | FLAVOUR(267104)-ERC-100, LTH 1051 | hep-ph hep-ex hep-lat | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present a new analysis of the ratio epsilon'/epsilon within the Standard
Model (SM) using a formalism that is manifestly independent of the values of
leading (V-A)x(V-A) QCD penguin, and EW penguin hadronic matrix elements of the
operators Q_4, Q_9, and Q_10, and applies to the SM as well as extensions with
the same operator structure. It is valid under the assumption that the SM
exactly describes the data on CP-conserving K -> pi pi amplitudes. As a result
of this and the high precision now available for CKM and quark mass parameters,
to high accuracy epsilon'/epsilon depends only on two non-perturbative
parameters, B_6^(1/2) and B_8^(3/2), and perturbatively calculable Wilson
coefficients. Within the SM, we are separately able to determine the hadronic
matrix element <Q_4>_0 from CP-conserving data, significantly more precisely
than presently possible with lattice QCD. Employing B_6^(1/2) = 0.57+-0.19 and
B_8^(3/2) = 0.76+-0.05, extracted from recent results by the RBC-UKQCD
collaboration, we obtain epsilon'/epsilon = (1.9+-4.5) 10^-4, substantially
more precise than the recent RBC-UKQCD prediction and 2.9 sigma below the
experimental value (16.6+-2.3) 10^-4, with the error being fully dominated by
that on B_6^(1/2). Even discarding lattice input completely, but employing the
recently obtained bound B_6^(1/2) <= B_8^(3/2) <= 1 from the large-N approach,
the SM value is found more than 2 sigma below the experimental value. At
B_6^(1/2) = B_8^(3/2) = 1, varying all other parameters within one sigma, we
find epsilon'/epsilon = (8.6+-3.2) 10^-4. We present a detailed anatomy of the
various SM uncertainties, including all sub-leading hadronic matrix elements,
briefly commenting on the possibility of underestimated SM contributions as
well as on the impact of our results on new physics models.
| [
{
"created": "Wed, 22 Jul 2015 21:42:49 GMT",
"version": "v1"
},
{
"created": "Thu, 17 Sep 2015 19:05:35 GMT",
"version": "v2"
},
{
"created": "Tue, 17 Nov 2015 17:18:18 GMT",
"version": "v3"
}
] | 2016-01-27 | [
[
"Buras",
"Andrzej J.",
""
],
[
"Gorbahn",
"Martin",
""
],
[
"Jäger",
"Sebastian",
""
],
[
"Jamin",
"Matthias",
""
]
] | We present a new analysis of the ratio epsilon'/epsilon within the Standard Model (SM) using a formalism that is manifestly independent of the values of leading (V-A)x(V-A) QCD penguin, and EW penguin hadronic matrix elements of the operators Q_4, Q_9, and Q_10, and applies to the SM as well as extensions with the same operator structure. It is valid under the assumption that the SM exactly describes the data on CP-conserving K -> pi pi amplitudes. As a result of this and the high precision now available for CKM and quark mass parameters, to high accuracy epsilon'/epsilon depends only on two non-perturbative parameters, B_6^(1/2) and B_8^(3/2), and perturbatively calculable Wilson coefficients. Within the SM, we are separately able to determine the hadronic matrix element <Q_4>_0 from CP-conserving data, significantly more precisely than presently possible with lattice QCD. Employing B_6^(1/2) = 0.57+-0.19 and B_8^(3/2) = 0.76+-0.05, extracted from recent results by the RBC-UKQCD collaboration, we obtain epsilon'/epsilon = (1.9+-4.5) 10^-4, substantially more precise than the recent RBC-UKQCD prediction and 2.9 sigma below the experimental value (16.6+-2.3) 10^-4, with the error being fully dominated by that on B_6^(1/2). Even discarding lattice input completely, but employing the recently obtained bound B_6^(1/2) <= B_8^(3/2) <= 1 from the large-N approach, the SM value is found more than 2 sigma below the experimental value. At B_6^(1/2) = B_8^(3/2) = 1, varying all other parameters within one sigma, we find epsilon'/epsilon = (8.6+-3.2) 10^-4. We present a detailed anatomy of the various SM uncertainties, including all sub-leading hadronic matrix elements, briefly commenting on the possibility of underestimated SM contributions as well as on the impact of our results on new physics models. |
1101.0288 | Carlo Ewerz | Carlo Ewerz, Andreas von Manteuffel, Otto Nachtmann | On the Energy Dependence of the Dipole-Proton Cross Section in Deep
Inelastic Scattering | 27 pages | JHEP 1103:062,2011 | 10.1007/JHEP03(2011)062 | ZU-TH 21/10 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the dipole picture of high-energy virtual-photon-proton scattering.
It is shown that different choices for the energy variable in the dipole cross
section used in the literature are not related to each other by simple
arguments equating the typical dipole size and the inverse photon virtuality,
contrary to what is often stated. We argue that the good quality of fits to
structure functions that use Bjorken-x as the energy variable - which is
strictly speaking not justified in the dipole picture - can instead be
understood as a consequence of the sign of scaling violations that occur for
increasing Q^2 at fixed small x. We show that the dipole formula for massless
quarks has the structure of a convolution. From this we obtain derivative
relations between the structure function F_2 at large and small Q^2 and the
dipole-proton cross section at small and large dipole size r, respectively.
| [
{
"created": "Fri, 31 Dec 2010 18:52:44 GMT",
"version": "v1"
}
] | 2011-03-28 | [
[
"Ewerz",
"Carlo",
""
],
[
"von Manteuffel",
"Andreas",
""
],
[
"Nachtmann",
"Otto",
""
]
] | We study the dipole picture of high-energy virtual-photon-proton scattering. It is shown that different choices for the energy variable in the dipole cross section used in the literature are not related to each other by simple arguments equating the typical dipole size and the inverse photon virtuality, contrary to what is often stated. We argue that the good quality of fits to structure functions that use Bjorken-x as the energy variable - which is strictly speaking not justified in the dipole picture - can instead be understood as a consequence of the sign of scaling violations that occur for increasing Q^2 at fixed small x. We show that the dipole formula for massless quarks has the structure of a convolution. From this we obtain derivative relations between the structure function F_2 at large and small Q^2 and the dipole-proton cross section at small and large dipole size r, respectively. |
0811.3662 | Zhong-Bo Kang | Zhong-Bo Kang (Iowa State U.), Jian-Wei Qiu (Iowa State U.), and
Werner Vogelsang (BNL) | Low-mass lepton pair production at large transverse momentum | 16 pages, 11 figures, revised version to appear in Phys. Rev. D | Phys.Rev.D79:054007,2009 | 10.1103/PhysRevD.79.054007 | null | hep-ph nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the transverse momentum distribution of low-mass lepton pairs
produced in hadronic scattering, using the perturbative QCD factorization
approach. We argue that the distribution at large transverse momentum, $Q_T \gg
Q$, with the pair's invariant mass $Q$ as low as $Q \sim
\Lambda_{\mathrm{QCD}}$, can be systematically factorized into universal
parton-to-lepton pair fragmentation functions, parton distributions, and
perturbatively calculable partonic hard parts evaluated at a short distance
scale $\sim {\cal O}(1/Q_T)$. We introduce a model for the input lepton pair
fragmentation functions at a scale $\mu_0\sim 1$ GeV, which are then evolved
perturbatively to scales relevant at RHIC. Using the evolved fragmentation
functions, we calculate the transverse momentum distributions in hadron-hadron,
hadron-nucleus, and nucleus-nucleus collisions at RHIC. We also discuss the
sensitivity of the transverse momentum distribution of low-mass lepton pairs to
the gluon distribution.
| [
{
"created": "Sat, 22 Nov 2008 19:06:54 GMT",
"version": "v1"
},
{
"created": "Fri, 20 Feb 2009 06:05:02 GMT",
"version": "v2"
}
] | 2009-03-24 | [
[
"Kang",
"Zhong-Bo",
"",
"Iowa State U."
],
[
"Qiu",
"Jian-Wei",
"",
"Iowa State U."
],
[
"Vogelsang",
"Werner",
"",
"BNL"
]
] | We study the transverse momentum distribution of low-mass lepton pairs produced in hadronic scattering, using the perturbative QCD factorization approach. We argue that the distribution at large transverse momentum, $Q_T \gg Q$, with the pair's invariant mass $Q$ as low as $Q \sim \Lambda_{\mathrm{QCD}}$, can be systematically factorized into universal parton-to-lepton pair fragmentation functions, parton distributions, and perturbatively calculable partonic hard parts evaluated at a short distance scale $\sim {\cal O}(1/Q_T)$. We introduce a model for the input lepton pair fragmentation functions at a scale $\mu_0\sim 1$ GeV, which are then evolved perturbatively to scales relevant at RHIC. Using the evolved fragmentation functions, we calculate the transverse momentum distributions in hadron-hadron, hadron-nucleus, and nucleus-nucleus collisions at RHIC. We also discuss the sensitivity of the transverse momentum distribution of low-mass lepton pairs to the gluon distribution. |
1809.07144 | Boris A. Arbuzov | B.A. Arbuzov and I.V. Zaitsev | Looking for non-perturbative effects of the electroweak interaction at
the LHC | 5 pages, 2 figures, corrections made, typos corrected | null | 10.1142/S0217751X19500532 | null | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We are considering a possibility for detecting non-perturbative effect in
process of top pair production in association with a high $p_T$ photon.
Starting from previous results on two solutions for a spontaneous generation of
wouldbe effective interaction of a top pair with a pair of electro-weak bosons,
we show, that a solution with effective cut-off $\Lambda \simeq 10^2\,TeV$ is
already contradicting to existing data, while the other one with $\Lambda
\simeq 10^{16}\,TeV$ (just the Planck scale) could be reconciled with data and
give predictions for process $p+p\to\bar t t \gamma+X$, which could be
effectively checked at the LHC with $\sqrt{s}=13\,TeV$. The confirmation of the
predictions would mean a strong support for the existence of non-perturbative
effects in the electro-weak interaction.
| [
{
"created": "Wed, 19 Sep 2018 12:19:34 GMT",
"version": "v1"
},
{
"created": "Tue, 23 Oct 2018 08:16:45 GMT",
"version": "v2"
}
] | 2019-05-01 | [
[
"Arbuzov",
"B. A.",
""
],
[
"Zaitsev",
"I. V.",
""
]
] | We are considering a possibility for detecting non-perturbative effect in process of top pair production in association with a high $p_T$ photon. Starting from previous results on two solutions for a spontaneous generation of wouldbe effective interaction of a top pair with a pair of electro-weak bosons, we show, that a solution with effective cut-off $\Lambda \simeq 10^2\,TeV$ is already contradicting to existing data, while the other one with $\Lambda \simeq 10^{16}\,TeV$ (just the Planck scale) could be reconciled with data and give predictions for process $p+p\to\bar t t \gamma+X$, which could be effectively checked at the LHC with $\sqrt{s}=13\,TeV$. The confirmation of the predictions would mean a strong support for the existence of non-perturbative effects in the electro-weak interaction. |
2112.06929 | Martin Hoferichter | Martin Hoferichter, Thomas Teubner | Mixed leptonic and hadronic corrections to the anomalous magnetic moment
of the muon | 7 pages, 2 figures | Phys. Rev. Lett. 128, 112002 (2022) | 10.1103/PhysRevLett.128.112002 | LTH 1287 | hep-ph hep-ex hep-lat nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Higher-order hadronic corrections to the anomalous magnetic moment of the
muon have been evaluated including next-to-next-to-leading-order insertions of
hadronic vacuum polarization and next-to-leading-order corrections to hadronic
light-by-light scattering. This leaves a set of mixed leptonic and hadronic
corrections in the form of double-bubble topologies as the only remaining
hadronic effect at ${\mathcal O}(\alpha^4)$. Here, we estimate these
contributions by analyzing the respective cuts of the diagrams, suggesting that
the impact is limited to $\lesssim 1\times 10^{-11}$ and thus negligible at the
level of the final precision of the Fermilab $g-2$ experiment.
| [
{
"created": "Mon, 13 Dec 2021 19:00:00 GMT",
"version": "v1"
},
{
"created": "Fri, 18 Mar 2022 09:39:01 GMT",
"version": "v2"
}
] | 2022-03-21 | [
[
"Hoferichter",
"Martin",
""
],
[
"Teubner",
"Thomas",
""
]
] | Higher-order hadronic corrections to the anomalous magnetic moment of the muon have been evaluated including next-to-next-to-leading-order insertions of hadronic vacuum polarization and next-to-leading-order corrections to hadronic light-by-light scattering. This leaves a set of mixed leptonic and hadronic corrections in the form of double-bubble topologies as the only remaining hadronic effect at ${\mathcal O}(\alpha^4)$. Here, we estimate these contributions by analyzing the respective cuts of the diagrams, suggesting that the impact is limited to $\lesssim 1\times 10^{-11}$ and thus negligible at the level of the final precision of the Fermilab $g-2$ experiment. |
hep-ph/0311256 | Leonardo Cosmai | P. Cea, M. Consoli and L. Cosmai | Lattice measurement of the rescaling of the scalar condensate | 8 pages, 1 figure, 2 tables | null | null | BARI-TH 475/2003 | hep-ph hep-lat hep-th | null | We have determined the rescaling of the scalar condensate $Z\equiv Z_\phi$
near the critical line of a 4D Ising model. Our lattice data, supporting
previous numerical indications, confirm the behaviour $Z_\phi\sim \ln ({\rm
cutoff})$. This result is predicted in an alternative description of symmetry
breaking where there are no upper bounds on the Higgs boson mass from
`triviality'.
| [
{
"created": "Thu, 20 Nov 2003 17:31:21 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Cea",
"P.",
""
],
[
"Consoli",
"M.",
""
],
[
"Cosmai",
"L.",
""
]
] | We have determined the rescaling of the scalar condensate $Z\equiv Z_\phi$ near the critical line of a 4D Ising model. Our lattice data, supporting previous numerical indications, confirm the behaviour $Z_\phi\sim \ln ({\rm cutoff})$. This result is predicted in an alternative description of symmetry breaking where there are no upper bounds on the Higgs boson mass from `triviality'. |
hep-ph/9707372 | Carlo Giunti | S.M. Bilenky, C. Giunti, W. Grimus | Schemes of neutrino mixing from the results of neutrino oscillation
experiments | 10 pages, including 2 figures. Talk presented by C. Giunti at the 9th
International School "Particles and Cosmology", Kabardino Balkaria, Baksan
Valley, Russia, April 15-22, 1997 | null | null | UWThPh-1997-17, DFTT 44/97 | hep-ph | null | The mixing of three and four massive neutrinos is considered. It is shown
that the neutrino oscillation data are not compatible with a hierarchy of
couplings in the three-neutrino case. In the case of four neutrinos, a
hierarchy of masses is not favored by the data. Only two schemes with two pairs
of close masses separated by a gap of the order of 1 eV can accommodate the
results of all experiments. If the existing indications in favor of neutrino
oscillations will be confirmed, it will mean that the general features of
neutrino mixing are quite different from those of quark mixing.
| [
{
"created": "Thu, 17 Jul 1997 11:52:28 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Bilenky",
"S. M.",
""
],
[
"Giunti",
"C.",
""
],
[
"Grimus",
"W.",
""
]
] | The mixing of three and four massive neutrinos is considered. It is shown that the neutrino oscillation data are not compatible with a hierarchy of couplings in the three-neutrino case. In the case of four neutrinos, a hierarchy of masses is not favored by the data. Only two schemes with two pairs of close masses separated by a gap of the order of 1 eV can accommodate the results of all experiments. If the existing indications in favor of neutrino oscillations will be confirmed, it will mean that the general features of neutrino mixing are quite different from those of quark mixing. |
1206.4086 | David Shih | Nathaniel Craig, Simon Knapen, David Shih, Yue Zhao | A Complete Model of Low-Scale Gauge Mediation | 33 pages; v2: refs added, minor changes | null | 10.1007/JHEP03(2013)154 | RUNHETC-2012-13 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Recent signs of a Standard Model-like Higgs at 125 GeV point towards large
A-terms in the MSSM. This presents special challenges for gauge mediation,
which by itself predicts vanishing A-terms at the messenger scale. In this
paper, we review the general problems that arise when extending gauge mediation
to achieve large A-terms, and the mechanisms that exist to overcome them. Using
these mechanisms, we construct weakly-coupled models of low-scale gauge
mediation with extended Higgs-messenger couplings that generate large A-terms
at the messenger scale and viable mu/B_mu-terms. Our models are simple,
economical, and complete realizations of supersymmetry at the weak scale.
| [
{
"created": "Mon, 18 Jun 2012 21:59:05 GMT",
"version": "v1"
},
{
"created": "Wed, 19 Dec 2012 01:57:35 GMT",
"version": "v2"
}
] | 2015-06-05 | [
[
"Craig",
"Nathaniel",
""
],
[
"Knapen",
"Simon",
""
],
[
"Shih",
"David",
""
],
[
"Zhao",
"Yue",
""
]
] | Recent signs of a Standard Model-like Higgs at 125 GeV point towards large A-terms in the MSSM. This presents special challenges for gauge mediation, which by itself predicts vanishing A-terms at the messenger scale. In this paper, we review the general problems that arise when extending gauge mediation to achieve large A-terms, and the mechanisms that exist to overcome them. Using these mechanisms, we construct weakly-coupled models of low-scale gauge mediation with extended Higgs-messenger couplings that generate large A-terms at the messenger scale and viable mu/B_mu-terms. Our models are simple, economical, and complete realizations of supersymmetry at the weak scale. |
hep-ph/9810243 | Shi-Lin Zhu | Shi-Lin Zhu and Yuan-Ben Dai (Institute of Theoretical Physics,
Academia Sinica) | Radiative decays of heavy hadrons from light cone QCD sum rules in the
leading order of HQET | 14 pages, 9 figures, to appear in Phys. Rev. D | Phys.Rev. D59 (1999) 114015 | 10.1103/PhysRevD.59.114015 | null | hep-ph | null | The radiative decays of heavy baryons and lowest three doublets of heavy
mesons are studied with the light cone QCD sum rules in the leading order of
heavy quark effective theory.
| [
{
"created": "Mon, 5 Oct 1998 02:49:04 GMT",
"version": "v1"
},
{
"created": "Wed, 17 Mar 1999 00:15:57 GMT",
"version": "v2"
}
] | 2009-10-31 | [
[
"Zhu",
"Shi-Lin",
"",
"Institute of Theoretical Physics,\n Academia Sinica"
],
[
"Dai",
"Yuan-Ben",
"",
"Institute of Theoretical Physics,\n Academia Sinica"
]
] | The radiative decays of heavy baryons and lowest three doublets of heavy mesons are studied with the light cone QCD sum rules in the leading order of heavy quark effective theory. |
hep-ph/9302255 | Carl Im | C. Im, G. Kane, P. Malde | Could Large CP Violation Be Detected at Colliders? | 11pp, LaTeX, UM--TH--92--27(massaged to make TeX output cleaner), no
pictures | Phys.Lett.B317:454-461,1993 | 10.1016/0370-2693(93)91024-H | null | hep-ph | null | We argue that CP--violation effects below a few tenths of a percent are
probably undetectable at hadron and electron colliders. Thus only operators
whose contributions interfere with tree--level Standard Model amplitudes are
detectable. We list these operators for Standard Model external particles and
some two and three body final state reactions that could show detectable
effects. These could test electroweak baryogenesis scenarios.
| [
{
"created": "Fri, 12 Feb 1993 08:13:16 GMT",
"version": "v1"
},
{
"created": "Thu, 18 Feb 1993 18:56:13 GMT",
"version": "v2"
}
] | 2010-11-01 | [
[
"Im",
"C.",
""
],
[
"Kane",
"G.",
""
],
[
"Malde",
"P.",
""
]
] | We argue that CP--violation effects below a few tenths of a percent are probably undetectable at hadron and electron colliders. Thus only operators whose contributions interfere with tree--level Standard Model amplitudes are detectable. We list these operators for Standard Model external particles and some two and three body final state reactions that could show detectable effects. These could test electroweak baryogenesis scenarios. |
1703.02977 | Yue Zhang | Wai-Yee Keung, Ian Low, Yue Zhang | A Reappraisal on Dark Matter Co-annihilating with a Top/Bottom Partner | 22 pages, 7 figures. v2: updated with the 2017 Moriond results;
included non-abelian interaction contribution to bound state formation;
conclusion not changed; more references added | Phys. Rev. D 96, 015008 (2017) | 10.1103/PhysRevD.96.015008 | NUHEP-TH/17-02 | hep-ph astro-ph.CO hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We revisit the calculation of relic density of dark matter particles
co-annihilating with a top or bottom partner, by properly including the QCD
bound-states (onia) effects of the colored partners, as well as the relevant
electroweak processes which become important in the low mass region. We
carefully set up the complete framework that incorporates the relevant
contributions and investigate their effects on the cosmologically preferred
mass spectrum, which turn out to be comparable in size to those coming from the
Sommerfeld enhancement. We apply the calculation to three scenarios: bino-stop
and bino-sbottom co-annihilations in supersymmetry, and a vector dark matter
co-annihilating with a fermionic top partner. In addition, we confront our
analysis of the relic abundance with recent direct detection experiments and
collider searches at the LHC, which have important implications in the
bino-stop and bino-sbottom scenarios. In particular, in the bino-stop case
recent LHC limits have excluded regions of parameter with a direct detection
rate that is above the neutrino floor.
| [
{
"created": "Wed, 8 Mar 2017 19:00:01 GMT",
"version": "v1"
},
{
"created": "Mon, 3 Apr 2017 16:32:44 GMT",
"version": "v2"
}
] | 2017-07-19 | [
[
"Keung",
"Wai-Yee",
""
],
[
"Low",
"Ian",
""
],
[
"Zhang",
"Yue",
""
]
] | We revisit the calculation of relic density of dark matter particles co-annihilating with a top or bottom partner, by properly including the QCD bound-states (onia) effects of the colored partners, as well as the relevant electroweak processes which become important in the low mass region. We carefully set up the complete framework that incorporates the relevant contributions and investigate their effects on the cosmologically preferred mass spectrum, which turn out to be comparable in size to those coming from the Sommerfeld enhancement. We apply the calculation to three scenarios: bino-stop and bino-sbottom co-annihilations in supersymmetry, and a vector dark matter co-annihilating with a fermionic top partner. In addition, we confront our analysis of the relic abundance with recent direct detection experiments and collider searches at the LHC, which have important implications in the bino-stop and bino-sbottom scenarios. In particular, in the bino-stop case recent LHC limits have excluded regions of parameter with a direct detection rate that is above the neutrino floor. |
2312.04870 | Mykhailo Konchatnij | G. I. Gakh, M.I.Konchatnij, N.P.Merenkov and A.G.Gakh | Manifestation of heavy 3/2-spin lepton in large-angle $e^+e^-\rightarrow
\gamma\gamma $ reaction at high energies | 17 pages, 7 figures | null | null | null | hep-ph | http://creativecommons.org/licenses/by/4.0/ | Manifestation of the heavy 3/2-spin lepton $(h^\pm)$, as possible virtual
intermediate state in Feynmann diagrams, have been searched in the $e^+\,e^-\to
\gamma\,\gamma$ reaction at high energies and large photon angles. The
spin-vector field $\Psi_\alpha$ of the 3/2-lepton is described by the
Rarita-Schwinger one and phenomenological Lagrangian of $h^\pm\, e^\pm \,
\gamma$-interaction is chosen similarly to interaction of $\Delta$ isobar with
nucleon and $\gamma$ quant. It is described by two constants with dimension
$[M^{-1}]$ and $[M^{-2}].$ The differential cross section and polarization
asymmetries have been calculated for the case when both beams are polarized
longitudinally along their directions, as well transversally, in the reaction
plane, and normally, perpendicularly to it. Numerical estimations are performed
in wide diapason of the collision energy and parameters entering
phenomenological Lagrangian.
| [
{
"created": "Fri, 8 Dec 2023 07:09:19 GMT",
"version": "v1"
}
] | 2023-12-11 | [
[
"Gakh",
"G. I.",
""
],
[
"Konchatnij",
"M. I.",
""
],
[
"Merenkov",
"N. P.",
""
],
[
"Gakh",
"A. G.",
""
]
] | Manifestation of the heavy 3/2-spin lepton $(h^\pm)$, as possible virtual intermediate state in Feynmann diagrams, have been searched in the $e^+\,e^-\to \gamma\,\gamma$ reaction at high energies and large photon angles. The spin-vector field $\Psi_\alpha$ of the 3/2-lepton is described by the Rarita-Schwinger one and phenomenological Lagrangian of $h^\pm\, e^\pm \, \gamma$-interaction is chosen similarly to interaction of $\Delta$ isobar with nucleon and $\gamma$ quant. It is described by two constants with dimension $[M^{-1}]$ and $[M^{-2}].$ The differential cross section and polarization asymmetries have been calculated for the case when both beams are polarized longitudinally along their directions, as well transversally, in the reaction plane, and normally, perpendicularly to it. Numerical estimations are performed in wide diapason of the collision energy and parameters entering phenomenological Lagrangian. |
1512.04203 | Shao-Hsuan Chiu | S. H. Chiu | A rephasing invariant study of neutrino mixing | 8 pages, 1 figure | PoS EPS-HEP2015 (2015) 048 | null | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We derive a set of renormalization group equations (RGE) for Dirac neutrinos
using a rephasing invariant parametrization. The symmetric properties of these
equations under flavor permutation facilitate the derivation of some exact and
approximate RGE invariants. Even though the complete analytical solutions for
the RGE are unavailable, we provide a numerical example that illustrate the
evolution of the neutrino mixing parameters.
| [
{
"created": "Mon, 14 Dec 2015 07:14:12 GMT",
"version": "v1"
}
] | 2015-12-15 | [
[
"Chiu",
"S. H.",
""
]
] | We derive a set of renormalization group equations (RGE) for Dirac neutrinos using a rephasing invariant parametrization. The symmetric properties of these equations under flavor permutation facilitate the derivation of some exact and approximate RGE invariants. Even though the complete analytical solutions for the RGE are unavailable, we provide a numerical example that illustrate the evolution of the neutrino mixing parameters. |
hep-ph/0310048 | Wojciech Broniowski | Wojciech Broniowski (INP, Cracow) and Enrique Ruiz Arriola (U.
Granada) | Impact-Parameter Dependence of the Diagonal GPD of the Pion from Chiral
Quark Models | 4 pages, 3 figures, presented at "Light Cone Workshop: Hadrons and
Beyond", 5-9 August 2003, University of Durham | null | null | null | hep-ph | null | We analyze the impact-parameter dependent diagonal non-singlet generalized
parton distribution of the pion in two distinct chiral quark models: the
Spectral Quark Model and the Nambu-Jona-Lasinio model. Leading-order
perturbative QCD evolution from the low quark-model scale to higher scales is
carried out with the help of the inverse Mellin transform. The model agrees
very reasonably with the recent results from transverse-lattice calculations,
while the forward parton distribution agrees with the experimental data.
| [
{
"created": "Fri, 3 Oct 2003 11:49:18 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Broniowski",
"Wojciech",
"",
"INP, Cracow"
],
[
"Arriola",
"Enrique Ruiz",
"",
"U.\n Granada"
]
] | We analyze the impact-parameter dependent diagonal non-singlet generalized parton distribution of the pion in two distinct chiral quark models: the Spectral Quark Model and the Nambu-Jona-Lasinio model. Leading-order perturbative QCD evolution from the low quark-model scale to higher scales is carried out with the help of the inverse Mellin transform. The model agrees very reasonably with the recent results from transverse-lattice calculations, while the forward parton distribution agrees with the experimental data. |
hep-ph/9809415 | null | R. N. Mohapatra and S. Nussinov | Bimaximal Neutrino Mixing and Neutrino Mass Matrix | New material strengthening the argument of the paper added; 10 pages
latex; UMD-PP-99-20 | Phys.Rev. D60 (1999) 013002 | 10.1103/PhysRevD.60.013002 | null | hep-ph | null | We show that the bimaximal neutrino mixing pattern suggested by the solar and
atmospheric neutrino data can be derived from the maximal, symmetric, four
neutrino mixing in the limit that one of the neutrinos is made heavy. Imposing
the constraints of no neutrinoless double beta decay and a 20% hot dark matter
component of the universe leads to a three neutrino mass matrix recently
suggested by Georgi and Glashow. Our result can be useful in constructing
theoretical models for the bimaximal pattern. We illustrate this by a simple
example.
| [
{
"created": "Wed, 16 Sep 1998 15:58:30 GMT",
"version": "v1"
},
{
"created": "Mon, 21 Sep 1998 19:37:14 GMT",
"version": "v2"
},
{
"created": "Mon, 30 Nov 1998 16:18:03 GMT",
"version": "v3"
}
] | 2009-10-31 | [
[
"Mohapatra",
"R. N.",
""
],
[
"Nussinov",
"S.",
""
]
] | We show that the bimaximal neutrino mixing pattern suggested by the solar and atmospheric neutrino data can be derived from the maximal, symmetric, four neutrino mixing in the limit that one of the neutrinos is made heavy. Imposing the constraints of no neutrinoless double beta decay and a 20% hot dark matter component of the universe leads to a three neutrino mass matrix recently suggested by Georgi and Glashow. Our result can be useful in constructing theoretical models for the bimaximal pattern. We illustrate this by a simple example. |
1206.7098 | Kentarou Mawatari | P. de Aquino, F. Maltoni, K. Mawatari, B. Oexl | Light gravitino production in association with gluinos at the LHC | 18 pages, 8 figures, 1 table; v2: typos corrected, version to appear
in JHEP | null | 10.1007/JHEP10(2012)008 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the jets plus missing energy signature at the LHC in a scenario
where the gravitino is very light and the gluino is the next-to-lightest
supersymmetric particle and promptly decays into a gluon and a gravitino. We
consider both associated gravitino production with a gluino and gluino pair
production. By merging matrix elements with parton showers, we generate
inclusive signal and background samples and show how information on the gluino
and gravitino masses can be obtained by simple final state observables.
| [
{
"created": "Fri, 29 Jun 2012 18:50:43 GMT",
"version": "v1"
},
{
"created": "Sun, 30 Sep 2012 13:17:41 GMT",
"version": "v2"
}
] | 2015-06-05 | [
[
"de Aquino",
"P.",
""
],
[
"Maltoni",
"F.",
""
],
[
"Mawatari",
"K.",
""
],
[
"Oexl",
"B.",
""
]
] | We study the jets plus missing energy signature at the LHC in a scenario where the gravitino is very light and the gluino is the next-to-lightest supersymmetric particle and promptly decays into a gluon and a gravitino. We consider both associated gravitino production with a gluino and gluino pair production. By merging matrix elements with parton showers, we generate inclusive signal and background samples and show how information on the gluino and gravitino masses can be obtained by simple final state observables. |
hep-ph/0208016 | Alakabha Datta | Alakabha Datta | R-parity-violating SUSY and CP violation in B --> phi K_s | Equations corrected. Conclusions unchanged. Latex, 6 pages, one fig | Phys.Rev.D66:071702,2002 | 10.1103/PhysRevD.66.071702 | UdeM-GPP-TH-02-103 | hep-ph | null | Recent measurements of CP asymmetry in B --> phi K_S appear to be
inconsistent with Standard Model expectations. We explore the effect of
R-parity-violating SUSY to understand the data.
| [
{
"created": "Fri, 2 Aug 2002 03:13:13 GMT",
"version": "v1"
},
{
"created": "Tue, 6 Aug 2002 18:51:52 GMT",
"version": "v2"
},
{
"created": "Tue, 6 Aug 2002 20:50:14 GMT",
"version": "v3"
}
] | 2014-11-17 | [
[
"Datta",
"Alakabha",
""
]
] | Recent measurements of CP asymmetry in B --> phi K_S appear to be inconsistent with Standard Model expectations. We explore the effect of R-parity-violating SUSY to understand the data. |
hep-ph/9512421 | Masahisa Matsuda | Naoyuki Haba, Masahisa Matsuda and Morimitsu Tanimoto | Spontaneous CP Violation and Higgs Masses in the Next-to-Minimal
Supersymmetric Model | LaTeX file, 23 pages, 3 figures, To appear in Phys.Rev.D | Phys.Rev.D54:6928-6935,1996 | 10.1103/PhysRevD.54.6928 | null | hep-ph | null | We study the possibility of spontaneous CP violation in the next-to-minimal
supersymmetric standard model (NMSSM). It is shown that the spontaneous CP
violation is induced by the radiative effects of top, stop, bottom and sbottom
superfields. The available regions of parameters, which are obtained by
imposing the constraints from experiments, are rather narrow. We also obtain
strong constraints for light Higgs masses such as m_H \le 36 GeV numerically.
Sum of masses of two light neutral Higgs should set around 93 GeV and charged
Higgs boson has a rather higher mass larger than 700 GeV.
| [
{
"created": "Mon, 25 Dec 1995 13:01:28 GMT",
"version": "v1"
},
{
"created": "Thu, 28 Dec 1995 11:43:25 GMT",
"version": "v2"
},
{
"created": "Wed, 2 Oct 1996 01:18:15 GMT",
"version": "v3"
}
] | 2014-11-17 | [
[
"Haba",
"Naoyuki",
""
],
[
"Matsuda",
"Masahisa",
""
],
[
"Tanimoto",
"Morimitsu",
""
]
] | We study the possibility of spontaneous CP violation in the next-to-minimal supersymmetric standard model (NMSSM). It is shown that the spontaneous CP violation is induced by the radiative effects of top, stop, bottom and sbottom superfields. The available regions of parameters, which are obtained by imposing the constraints from experiments, are rather narrow. We also obtain strong constraints for light Higgs masses such as m_H \le 36 GeV numerically. Sum of masses of two light neutral Higgs should set around 93 GeV and charged Higgs boson has a rather higher mass larger than 700 GeV. |
1211.6744 | Ingo Schienbein | T. Stavreva, F. Arleo, I. Schienbein | Prompt photon in association with a heavy-quark jet in Pb-Pb collisions
at the LHC | 22 pages, 18 figures, gzipped tar file. Minor changes, 2 references
added. Version published in JHEP | JHEP 1302 (2013) 072 | 10.1007/JHEP02(2013)072 | LPSC-12-323, LAPTH-056/12 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present a phenomenological study of the associated production of a prompt
photon and a heavy quark jet (charm or bottom) in Pb-Pb collisions at the LHC.
This channel allows for estimating the amount of energy loss experienced by the
charm and bottom quarks propagating in the dense QCD medium produced in those
collisions. Calculations are carried out at next-to-leading order (NLO)
accuracy using the BDMPS-Z heavy-quark quenching weights. The quenching of the
single heavy-quark jet spectrum reflects fairly the hierarchy in the heavy
quark energy loss assumed in the perturbative calculation. On the contrary, the
single photon spectrum in heavy-ion collisions is only modified at low momenta,
for which less heavy-quark jets pass the kinematic cuts. On top of single
particle spectra, the two-particle final state provides a range of observables
(photon-jet pair momentum, jet asymmetry, among others) which are studied in
detail. The comparison of the photon-jet pair momentum, from p-p to Pb-Pb
collisions, is sensitive to the amount of energy lost by the heavy-quarks and
could therefore be used in order to better understand parton energy loss
processes in the heavy quark sector.
| [
{
"created": "Wed, 28 Nov 2012 21:00:03 GMT",
"version": "v1"
},
{
"created": "Mon, 25 Feb 2013 17:52:01 GMT",
"version": "v2"
}
] | 2015-06-12 | [
[
"Stavreva",
"T.",
""
],
[
"Arleo",
"F.",
""
],
[
"Schienbein",
"I.",
""
]
] | We present a phenomenological study of the associated production of a prompt photon and a heavy quark jet (charm or bottom) in Pb-Pb collisions at the LHC. This channel allows for estimating the amount of energy loss experienced by the charm and bottom quarks propagating in the dense QCD medium produced in those collisions. Calculations are carried out at next-to-leading order (NLO) accuracy using the BDMPS-Z heavy-quark quenching weights. The quenching of the single heavy-quark jet spectrum reflects fairly the hierarchy in the heavy quark energy loss assumed in the perturbative calculation. On the contrary, the single photon spectrum in heavy-ion collisions is only modified at low momenta, for which less heavy-quark jets pass the kinematic cuts. On top of single particle spectra, the two-particle final state provides a range of observables (photon-jet pair momentum, jet asymmetry, among others) which are studied in detail. The comparison of the photon-jet pair momentum, from p-p to Pb-Pb collisions, is sensitive to the amount of energy lost by the heavy-quarks and could therefore be used in order to better understand parton energy loss processes in the heavy quark sector. |
hep-ph/9801449 | David Wright | David Wright | Naturally Nonminimal Supersymmetry | 5 embeded eps figures | null | null | UW/PT-97/27 | hep-ph | null | We consider the bounds imposed by naturalness on the masses of superpartners
for arbitrary points in nonminimal supersymmetric extensions of the standard
model and for arbitrary messenger scales. This constitutes a significant
generalization of previous work along these lines. We discuss appropriate
measures of naturalness and the status of nonminimal supersymmetry in the light
of recent experimental results.
| [
{
"created": "Fri, 30 Jan 1998 10:58:17 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Wright",
"David",
""
]
] | We consider the bounds imposed by naturalness on the masses of superpartners for arbitrary points in nonminimal supersymmetric extensions of the standard model and for arbitrary messenger scales. This constitutes a significant generalization of previous work along these lines. We discuss appropriate measures of naturalness and the status of nonminimal supersymmetry in the light of recent experimental results. |
2211.03921 | Xue-Chao Feng | Xue Chao Feng, Ke Wei Wei, Jie Wu, Xue Zhen Zhai, ShiZhuo Wang | Towards the assignments for $1^{1}D_{2}$ and $1^{3}D_{2}$ meson nonets | 13 pages, 6 figures | null | null | null | hep-ph | http://creativecommons.org/licenses/by/4.0/ | In this work, we investigate the mass spectrum of $1^{1}D_{2}$ and
$1^{3}D_{2}$ meson nonets in the framework of the meson mass matrix and Regge
phenomenology. The results are compared with the values from different
phenomenological models and may be useful for the assignment of the
$1^{1}D_{2}$ and $1^{3}D_{2}$ meson nonets in the future.
| [
{
"created": "Tue, 8 Nov 2022 00:37:17 GMT",
"version": "v1"
}
] | 2022-11-09 | [
[
"Feng",
"Xue Chao",
""
],
[
"Wei",
"Ke Wei",
""
],
[
"Wu",
"Jie",
""
],
[
"Zhai",
"Xue Zhen",
""
],
[
"Wang",
"ShiZhuo",
""
]
] | In this work, we investigate the mass spectrum of $1^{1}D_{2}$ and $1^{3}D_{2}$ meson nonets in the framework of the meson mass matrix and Regge phenomenology. The results are compared with the values from different phenomenological models and may be useful for the assignment of the $1^{1}D_{2}$ and $1^{3}D_{2}$ meson nonets in the future. |
0812.3712 | Lance Dixon | Lance J. Dixon and Yorgos Sofianatos | Resonance--Continuum Interference in Light Higgs Boson Production at a
Photon Collider | 14 pages, 4 figures; added references | Phys.Rev.D79:033002,2009 | 10.1103/PhysRevD.79.033002 | SLAC-PUB-13498 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the effect of interference between the Standard Model Higgs boson
resonance and the continuum background in the process gamma gamma -> H -> b
b-bar at a photon collider. Taking into account virtual gluon exchange between
the final-state quarks, we calculate the leading corrections to the height of
the resonance for the case of a light (m_H < 160 GeV) Higgs boson. We find that
the interference is destructive and around 0.1--0.2% of the peak height,
depending on the mass of the Higgs and the scattering angle. This suppression
is smaller by an order of magnitude than the anticipated experimental accuracy
at a photon collider. However, the fractional suppression can be significantly
larger if the Higgs coupling to b quarks is increased by physics beyond the
Standard Model.
| [
{
"created": "Fri, 19 Dec 2008 20:12:05 GMT",
"version": "v1"
},
{
"created": "Wed, 7 Jan 2009 10:46:03 GMT",
"version": "v2"
}
] | 2009-04-02 | [
[
"Dixon",
"Lance J.",
""
],
[
"Sofianatos",
"Yorgos",
""
]
] | We study the effect of interference between the Standard Model Higgs boson resonance and the continuum background in the process gamma gamma -> H -> b b-bar at a photon collider. Taking into account virtual gluon exchange between the final-state quarks, we calculate the leading corrections to the height of the resonance for the case of a light (m_H < 160 GeV) Higgs boson. We find that the interference is destructive and around 0.1--0.2% of the peak height, depending on the mass of the Higgs and the scattering angle. This suppression is smaller by an order of magnitude than the anticipated experimental accuracy at a photon collider. However, the fractional suppression can be significantly larger if the Higgs coupling to b quarks is increased by physics beyond the Standard Model. |
hep-ph/9709500 | Sheldon Stone | Sheldon Stone (Syracuse University) | THE Goals and Techniques of BTeV and LHC-B | 38 pages, Latex, 32 figures; to appear in proceedings of "Heavy
Flavor Physics: A Probe of Nature's Grand Design," Varenna, Italy, July 1997.
Also available at
http://physics.syr.edu/research/elementary_particles/experimental/varenna.ps | null | null | HEPSY 97-3 | hep-ph | null | BTeV and LHC-B are experiments being proposed to study $b$ and $c$ quark
decays in hadron-hadron collisions with the aims to look for new phenomena
beyond the Standard Model and to measure Standard Model parameters including
CKM elements and decay constants. The physics goals, required detection
techniques and simulations will be discussed.
| [
{
"created": "Tue, 30 Sep 1997 21:29:34 GMT",
"version": "v1"
}
] | 2009-09-25 | [
[
"Stone",
"Sheldon",
"",
"Syracuse University"
]
] | BTeV and LHC-B are experiments being proposed to study $b$ and $c$ quark decays in hadron-hadron collisions with the aims to look for new phenomena beyond the Standard Model and to measure Standard Model parameters including CKM elements and decay constants. The physics goals, required detection techniques and simulations will be discussed. |
0912.0967 | Efrain J. Ferrer | Efrain J. Ferrer | Induced Magnetism in Color-Superconducting Media | To appear in Proceedings for "Compact stars in the QCD phase diagram
II (CSQCD II), May 20-24, 2009, KIAA at Peking University, Beijing - P. R.
China [http://vega.bac.pku.edu.cn/rxxu/csqcd.htm] | null | null | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The dense core of compact stars is the natural medium for the realization of
color superconductivity. A common characteristic of such astrophysical objects
is their strong magnetic fields, especially those of the so called magnetars.
In this talk, I discuss how a color superconducting core can generate or/and
enhance the stellar magnetic field independently of a magnetohydrodynamic
dynamo mechanism. The magnetic field generator is in this case a gluonic
current which circulates to stabilize the color superconductor in the presence
of a strong magnetic field or under the pairing stress produced in the medium
by the neutrality and $\beta$-equilibrium constraints.
| [
{
"created": "Sat, 5 Dec 2009 00:58:18 GMT",
"version": "v1"
},
{
"created": "Fri, 22 Jan 2010 22:22:36 GMT",
"version": "v2"
}
] | 2010-01-23 | [
[
"Ferrer",
"Efrain J.",
""
]
] | The dense core of compact stars is the natural medium for the realization of color superconductivity. A common characteristic of such astrophysical objects is their strong magnetic fields, especially those of the so called magnetars. In this talk, I discuss how a color superconducting core can generate or/and enhance the stellar magnetic field independently of a magnetohydrodynamic dynamo mechanism. The magnetic field generator is in this case a gluonic current which circulates to stabilize the color superconductor in the presence of a strong magnetic field or under the pairing stress produced in the medium by the neutrality and $\beta$-equilibrium constraints. |
hep-ph/9810235 | Harald W. Griesshammer | H. W. Griesshammer (U of Washington) | Power Counting and \beta Function in NRQCD | 41 pages, LaTeX2e, uses feynmp to generate 122 drawings in 10
figures, 4 tables and 45 graphs in equations; necessary METAPOST-files
included. Major re-organisation and clarifications, adding discussion of
\beta function in Coulomb gauge and detailed treatment of non-Abelian vertex
corrections. Version to appear in Nucl. Phys. B | Nucl.Phys. B579 (2000) 313-351 | 10.1016/S0550-3213(99)00325-9 | NT@UW-98-22 | hep-ph | null | A computation of the NRQCD $\beta$ function both in the Lorentz gauge family
and in the Coulomb gauge to one loop order endorses a velocity power counting
scheme for dimensionally regularised NRQCD. In addition to the ultrasoft scale
represented by bremsstrahlung gluons and the potential scale with Coulomb
gluons and on-shell quarks, a soft r\'egime is identified in which energies and
momenta are of order $Mv$, gluons are on shell and the quark propagator becomes
static. The instantaneous gluon propagator has a non-zero vacuum polarisation
only because of contributions from this r\'egime, irrespective of the gauge
chosen. Rules are derived which allow one to read up from a given graph whether
it is zero because of the homogene{\ia}ty of dimensional regularisation. They
also apply to threshold expansion and are used to prove that ultrasoft quarks
with energy and momentum of order $Mv^2$ decouple from the theory.
| [
{
"created": "Fri, 2 Oct 1998 23:29:42 GMT",
"version": "v1"
},
{
"created": "Wed, 14 Apr 1999 22:57:35 GMT",
"version": "v2"
}
] | 2009-10-31 | [
[
"Griesshammer",
"H. W.",
"",
"U of Washington"
]
] | A computation of the NRQCD $\beta$ function both in the Lorentz gauge family and in the Coulomb gauge to one loop order endorses a velocity power counting scheme for dimensionally regularised NRQCD. In addition to the ultrasoft scale represented by bremsstrahlung gluons and the potential scale with Coulomb gluons and on-shell quarks, a soft r\'egime is identified in which energies and momenta are of order $Mv$, gluons are on shell and the quark propagator becomes static. The instantaneous gluon propagator has a non-zero vacuum polarisation only because of contributions from this r\'egime, irrespective of the gauge chosen. Rules are derived which allow one to read up from a given graph whether it is zero because of the homogene{\ia}ty of dimensional regularisation. They also apply to threshold expansion and are used to prove that ultrasoft quarks with energy and momentum of order $Mv^2$ decouple from the theory. |
hep-ph/0701197 | Stefano Profumo | Dan Hooper and Stefano Profumo | Dark Matter and Collider Phenomenology of Universal Extra Dimensions | Version to appear on Physics Reports, 114 pages, 40 figures;
references and material added | Phys.Rept.453:29-115,2007 | 10.1016/j.physrep.2007.09.003 | FERMILAB-PUB-07-018-A | hep-ph astro-ph hep-th | null | We review the phenomenology of models with flat, compactified extra
dimensions where all of the Standard Model fields are allowed to propagate in
the bulk, known as Universal Extra Dimensions (UED). UED make for an
interesting TeV-scale physics scenario, featuring a tower of Kaluza-Klein (KK)
states approximately degenerate in mass at the scale set by the inverse size of
the compactification radius. KK parity, the four-dimensional remnant of
momentum conservation in the extra dimensions, implies two basic consequences:
(1) contributions to Standard Model observables arise only at loop level, and
KK states can only be pair-produced at colliders, and (2) the lightest KK
particle (LKP) is stable, providing a suitable particle dark matter candidate.
After a theoretical overview on extra dimensional models, and on UED in
particular, we introduce the model particle spectrum and the constraints from
precision electroweak tests and current colliders data. We then give a detailed
overview of the LKP dark matter phenomenology, including the LKP relic
abundance, and direct and indirect searches. We then discuss the physics of UED
at colliders, with particular emphasis on the signatures predicted for the
Large Hadron Collider and at a future Linear Collider, as well as on the
problem of discriminating between UED and other TeV-scale new physics
scenarios, particularly supersymmetry. We propose a set of reference benchmark
models, representative of different viable UED realizations. Finally, we
collect in the Appendix all the relevant UED Feynman rules, the scattering
cross sections for annihilation and coannihilation processes in the early
universe and the production cross section for strongly interacting KK states at
hadron colliders.
| [
{
"created": "Tue, 23 Jan 2007 21:36:40 GMT",
"version": "v1"
},
{
"created": "Thu, 23 Aug 2007 23:46:36 GMT",
"version": "v2"
}
] | 2008-11-26 | [
[
"Hooper",
"Dan",
""
],
[
"Profumo",
"Stefano",
""
]
] | We review the phenomenology of models with flat, compactified extra dimensions where all of the Standard Model fields are allowed to propagate in the bulk, known as Universal Extra Dimensions (UED). UED make for an interesting TeV-scale physics scenario, featuring a tower of Kaluza-Klein (KK) states approximately degenerate in mass at the scale set by the inverse size of the compactification radius. KK parity, the four-dimensional remnant of momentum conservation in the extra dimensions, implies two basic consequences: (1) contributions to Standard Model observables arise only at loop level, and KK states can only be pair-produced at colliders, and (2) the lightest KK particle (LKP) is stable, providing a suitable particle dark matter candidate. After a theoretical overview on extra dimensional models, and on UED in particular, we introduce the model particle spectrum and the constraints from precision electroweak tests and current colliders data. We then give a detailed overview of the LKP dark matter phenomenology, including the LKP relic abundance, and direct and indirect searches. We then discuss the physics of UED at colliders, with particular emphasis on the signatures predicted for the Large Hadron Collider and at a future Linear Collider, as well as on the problem of discriminating between UED and other TeV-scale new physics scenarios, particularly supersymmetry. We propose a set of reference benchmark models, representative of different viable UED realizations. Finally, we collect in the Appendix all the relevant UED Feynman rules, the scattering cross sections for annihilation and coannihilation processes in the early universe and the production cross section for strongly interacting KK states at hadron colliders. |
2306.16290 | Laurin Pannullo | Laurin Pannullo | Inhomogeneous condensation in the Gross-Neveu model in noninteger
spatial dimensions $1 \leq d < 3$ | 14 pages, 6 figures. v2: corrected an error in the analysis for
figure 6, version as accepted for publication in Physical Review D | Phys. Rev. D 108, 036022 (2023) | 10.1103/PhysRevD.108.036022 | null | hep-ph cond-mat.str-el nucl-th | http://creativecommons.org/licenses/by/4.0/ | The Gross-Neveu model in the $N \to \infty$ approximation in $d=1$ spatial
dimensions exhibits a chiral inhomogeneous phase (IP), where the chiral
condensate has a spatial dependence that spontaneously breaks translational
invariance and the $\mathbb{Z}_2$ chiral symmetry. This phase is absent in
$d=2$, while in $d=3$ its existence and extent strongly depends on the
regularization and the value of the finite regulator. This work connects these
three results smoothly by extending the analysis to non-integer spatial
dimensions $1 \leq d <3$, where the model is fully renormalizable. To this end,
we adapt the stability analysis, which probes the stability of the homogeneous
ground state under inhomogeneous perturbations, to non-integer spatial
dimensions. We find that the IP is present for all $d<2$ and vanishes exactly
at $d=2$. Moreover, we find no instability towards an IP for $2\leq d<3$, which
suggests that the IP in $d=3$ is solely generated by the presence of a
regulator.
| [
{
"created": "Wed, 28 Jun 2023 15:10:42 GMT",
"version": "v1"
},
{
"created": "Sat, 5 Aug 2023 20:38:53 GMT",
"version": "v2"
}
] | 2023-08-30 | [
[
"Pannullo",
"Laurin",
""
]
] | The Gross-Neveu model in the $N \to \infty$ approximation in $d=1$ spatial dimensions exhibits a chiral inhomogeneous phase (IP), where the chiral condensate has a spatial dependence that spontaneously breaks translational invariance and the $\mathbb{Z}_2$ chiral symmetry. This phase is absent in $d=2$, while in $d=3$ its existence and extent strongly depends on the regularization and the value of the finite regulator. This work connects these three results smoothly by extending the analysis to non-integer spatial dimensions $1 \leq d <3$, where the model is fully renormalizable. To this end, we adapt the stability analysis, which probes the stability of the homogeneous ground state under inhomogeneous perturbations, to non-integer spatial dimensions. We find that the IP is present for all $d<2$ and vanishes exactly at $d=2$. Moreover, we find no instability towards an IP for $2\leq d<3$, which suggests that the IP in $d=3$ is solely generated by the presence of a regulator. |
1810.12682 | Faisal Akram | Bushra Shafaq and Faisal Akram | The Effect of the Earth Matter on Three Neutrino Oscillations and
Sensitivity to CP Phase Parameter | 19 pages, 7 figures | Eur. Phys. J. Plus, 135:94 (2020) | 10.1140/epjp/s13360-019-00083-2 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We find an analytical expression of neutrino evolution operator in the Earth
matter using perturbative approach in the context of three neutrino
oscillations. We find that our analytical expression is highly accurate by
comparing its results with the numerical solutions of neutrino evolution
equation at energy scales relevant for solar, reactor, atmospheric, and
accelerator neutrinos. Using our analytical approach we study the accuracy of
hypothesis of treating the Earth density piecewise constant. We also study how
the Earth matter effect can change the sensitivity to CP phase parameter
$\delta _{CP}$. Through nadir angle averaged conversion probabilities of
neutrino and anti-neutrino, we find that the sensitivity to $\delta _{CP}$ is
maximum in the energy range 0.2 to 1 GeV and through energy averaged conversion
probabilities, we find that the sensitivity is maximum about nadir angle
$72.5^{\text{o}}$ for neutrinos oscillating in the Earth matter.
| [
{
"created": "Tue, 30 Oct 2018 11:54:26 GMT",
"version": "v1"
}
] | 2020-01-29 | [
[
"Shafaq",
"Bushra",
""
],
[
"Akram",
"Faisal",
""
]
] | We find an analytical expression of neutrino evolution operator in the Earth matter using perturbative approach in the context of three neutrino oscillations. We find that our analytical expression is highly accurate by comparing its results with the numerical solutions of neutrino evolution equation at energy scales relevant for solar, reactor, atmospheric, and accelerator neutrinos. Using our analytical approach we study the accuracy of hypothesis of treating the Earth density piecewise constant. We also study how the Earth matter effect can change the sensitivity to CP phase parameter $\delta _{CP}$. Through nadir angle averaged conversion probabilities of neutrino and anti-neutrino, we find that the sensitivity to $\delta _{CP}$ is maximum in the energy range 0.2 to 1 GeV and through energy averaged conversion probabilities, we find that the sensitivity is maximum about nadir angle $72.5^{\text{o}}$ for neutrinos oscillating in the Earth matter. |
0903.2949 | Javier Vijande Asenjo | J. Vijande, A. Valcarce, N. Barnea | Exotic meson-meson molecules and compact four--quark states | null | Phys.Rev.D79:074010,2009 | 10.1103/PhysRevD.79.074010 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present an exact calculation of $S$ and $P$ wave $QQ\bar n\bar n$ states
using different standard nonrelativistic quark--quark potentials. We explore in
detail the charm and bottom sectors looking for bound states that could be
measured within existing facilities. Against the proliferation of four--quark
states sometimes predicted in the literature, we found a small number of
candidates to be stable. We analyze their properties in a trial to distinguish
between compact and molecular states. Possible decay modes are discussed.
| [
{
"created": "Tue, 17 Mar 2009 12:00:36 GMT",
"version": "v1"
}
] | 2009-11-06 | [
[
"Vijande",
"J.",
""
],
[
"Valcarce",
"A.",
""
],
[
"Barnea",
"N.",
""
]
] | We present an exact calculation of $S$ and $P$ wave $QQ\bar n\bar n$ states using different standard nonrelativistic quark--quark potentials. We explore in detail the charm and bottom sectors looking for bound states that could be measured within existing facilities. Against the proliferation of four--quark states sometimes predicted in the literature, we found a small number of candidates to be stable. We analyze their properties in a trial to distinguish between compact and molecular states. Possible decay modes are discussed. |
hep-ph/0401128 | Stefan Berge | S. Berge, P. Nadolsky, F. Olness, C.-P. Yuan | Resummation for the Tevatron and LHC boson production at small x | LaTeX, 5 pages, 2 figures. Contributed to 2003 Les Houches Workshop
on Physics at TeV Colliders | null | null | null | hep-ph | null | Analysis of small-x semi-inclusive DIS hadroproduction suggests that multiple
parton radiation leads to a broadening of transverse momentum distributions
beyond that predicted by a straightforward calculation in the
Collins-Soper-Sterman formalism. This effect can be modeled by a modification
of the resummed form factor in the small-x region. We discuss the impact of
such a modification on the production of electroweak bosons at hadron-hadron
colliders. We show that if substantial small-x broadening is observed in
forward Z boson production in the Tevatron Run-2, it would strongly affect
predicted transverse momentum distributions for W, Z, and Higgs boson
production at the Large Hadron Collider.
| [
{
"created": "Mon, 19 Jan 2004 01:39:24 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Berge",
"S.",
""
],
[
"Nadolsky",
"P.",
""
],
[
"Olness",
"F.",
""
],
[
"Yuan",
"C. -P.",
""
]
] | Analysis of small-x semi-inclusive DIS hadroproduction suggests that multiple parton radiation leads to a broadening of transverse momentum distributions beyond that predicted by a straightforward calculation in the Collins-Soper-Sterman formalism. This effect can be modeled by a modification of the resummed form factor in the small-x region. We discuss the impact of such a modification on the production of electroweak bosons at hadron-hadron colliders. We show that if substantial small-x broadening is observed in forward Z boson production in the Tevatron Run-2, it would strongly affect predicted transverse momentum distributions for W, Z, and Higgs boson production at the Large Hadron Collider. |
hep-ph/0407025 | A. D. Polosa | L. Maiani, F. Piccinini, A.D. Polosa, V. Riquer | Is the anomalous decay ratio of D_{sJ}(2632) due to isospin breaking? | 3 pages, 1 figure | Phys.Rev.D70:054009,2004 | 10.1103/PhysRevD.70.054009 | null | hep-ph | null | Quark pair annihilation into gluons is suppressed at large momenta due to the
asymptotic freedom. As a consequence, mass eigenvalues of heavy states should
be almost diagonal with respect to up and down quark masses, thereby breaking
isospin. We suggest the particle observed by the SELEX Collaboration,
D_{sJ}(2632) to be to a good extent a [cd][dbar sbar] state, which would
explain why its D^0 K^+ mode is anomalously suppressed with respect to D_s eta.
Predictions for the rates of the yet unobserved modes D_s pi^0 and D^+ K^0 are
given.
| [
{
"created": "Fri, 2 Jul 2004 12:02:06 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Maiani",
"L.",
""
],
[
"Piccinini",
"F.",
""
],
[
"Polosa",
"A. D.",
""
],
[
"Riquer",
"V.",
""
]
] | Quark pair annihilation into gluons is suppressed at large momenta due to the asymptotic freedom. As a consequence, mass eigenvalues of heavy states should be almost diagonal with respect to up and down quark masses, thereby breaking isospin. We suggest the particle observed by the SELEX Collaboration, D_{sJ}(2632) to be to a good extent a [cd][dbar sbar] state, which would explain why its D^0 K^+ mode is anomalously suppressed with respect to D_s eta. Predictions for the rates of the yet unobserved modes D_s pi^0 and D^+ K^0 are given. |
hep-ph/9906316 | Christer Friberg | Christer Friberg and Torbj\"orn Sj\"ostrand (Lund university, Sweden) | Some thoughts on how to match Leading Log Parton Showers with NLO Matrix
Elements | 5 pages, LaTeX, no figures, to appear in the Proceedings of the DESY
Workshop on "Monte Carlo Generators for HERA Physics" | null | null | LU TP 99-10 | hep-ph | null | We propose a scheme that could offer a convenient Monte Carlo sampling of
next-to-leading-order matrix elements and, at the same time, allow the
interfacing of such parton configurations with a parton-shower approach for the
estimation of higher-order effects. No actual implementation exists so far, so
this note should only be viewed as the outline of a possible road for the
future, submitted for discussion.
| [
{
"created": "Thu, 10 Jun 1999 10:31:09 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Friberg",
"Christer",
"",
"Lund university, Sweden"
],
[
"Sjöstrand",
"Torbjörn",
"",
"Lund university, Sweden"
]
] | We propose a scheme that could offer a convenient Monte Carlo sampling of next-to-leading-order matrix elements and, at the same time, allow the interfacing of such parton configurations with a parton-shower approach for the estimation of higher-order effects. No actual implementation exists so far, so this note should only be viewed as the outline of a possible road for the future, submitted for discussion. |
hep-ph/9712454 | Hiroshi Nunokawa | H. Nunokawa, J. T. Peltoniemi, A. Rossi and J. W. F. Valle | Bounds on sterile neutrino mixing for cosmologically interesting mass
range | Latex file, 3 pages including 4 ps figures, Talk given by H. Nunokawa
in TAUP97, Gran Sasso, Italy, 7-11 September, 1997 | Nucl.Phys.Proc.Suppl.70:129-131,1999 | 10.1016/S0920-5632(98)00404-6 | FTUV/97-70, IFIC/97-101, FISIST/13-97/CFIF | hep-ph astro-ph | null | This talk summarizes our recent work which studied the impact of resonant
$\nu_e \to\nu_s$ and $\bar{\nu}_e\to\bar{\nu}_s$ ($\nu_s$ is a sterile
neutrino) conversions on supernova physics, under the assumption that the mass
of the sterile state is in the few eV -cosmologically significant range.
| [
{
"created": "Fri, 19 Dec 1997 19:42:17 GMT",
"version": "v1"
}
] | 2009-09-17 | [
[
"Nunokawa",
"H.",
""
],
[
"Peltoniemi",
"J. T.",
""
],
[
"Rossi",
"A.",
""
],
[
"Valle",
"J. W. F.",
""
]
] | This talk summarizes our recent work which studied the impact of resonant $\nu_e \to\nu_s$ and $\bar{\nu}_e\to\bar{\nu}_s$ ($\nu_s$ is a sterile neutrino) conversions on supernova physics, under the assumption that the mass of the sterile state is in the few eV -cosmologically significant range. |
hep-ph/0010218 | Stefan Scherer | T. Fuchs (Institut f. Kernphysik, Mainz), B. Pasquini (ECT*, Trento),
C. Unkmeir, and S. Scherer (Institut f. Kernphysik, Mainz) | Virtual Compton Scattering off the Pseudoscalar Meson Octet | 9 pages, Latex, uses cjp3.sty (included), 4 eps figures, to be
published in the proceedings of the 13th Indian-Summer School "Understanding
the Structure of Hadrons," August 28 - September 1, 2000, Prague, Czech
Republic | Czech.J.Phys. 52 (2002) B135-B144 | 10.1007/s10582-001-0051-3 | MKPH-T-00-21 | hep-ph hep-ex nucl-ex nucl-th | null | We present a calculation of the virtual Compton scattering amplitude for the
pseudoscalar meson octet in the framework of chiral perturbation theory at
${\cal O}(p^4)$. We calculate the electromagnetic generalized polarizabilities
and compare the results in the real Compton scattering limit to available
experimental values. Finally, we give predictions for the differential cross
section of electron-meson bremsstrahlung.
| [
{
"created": "Thu, 19 Oct 2000 12:13:56 GMT",
"version": "v1"
}
] | 2009-10-31 | [
[
"Fuchs",
"T.",
"",
"Institut f. Kernphysik, Mainz"
],
[
"Pasquini",
"B.",
"",
"ECT*, Trento"
],
[
"Unkmeir",
"C.",
"",
"Institut f. Kernphysik, Mainz"
],
[
"Scherer",
"S.",
"",
"Institut f. Kernphysik, Mainz"
]
] | We present a calculation of the virtual Compton scattering amplitude for the pseudoscalar meson octet in the framework of chiral perturbation theory at ${\cal O}(p^4)$. We calculate the electromagnetic generalized polarizabilities and compare the results in the real Compton scattering limit to available experimental values. Finally, we give predictions for the differential cross section of electron-meson bremsstrahlung. |
2206.08326 | Junping Tian | Jorge de Blas, Yong Du, Christophe Grojean, Jiayin Gu, Victor
Miralles, Michael E. Peskin, Junping Tian, Marcel Vos, Eleni Vryonidou | Global SMEFT Fits at Future Colliders | Contributed Paper to Snowmass 2021. Minor updates from v4: corrected
typo in FCC-ee240 luminosity in Table 27 and CEPC360 luminosity in Table 28 | null | null | null | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Based on the framework of Standard Model Effective Field Theory, we performed
a few global fits, each containing a subset of dimension-6 operators, for the
measurements that are expected at future colliders. The fit for the Higgs and
electroweak sector improves what has been done for the European Strategy Update
in 2020 on both EFT treatments and experimental inputs. A new comprehensive fit
is performed focusing on 4-fermion interactions at future colliders. Top-quark
sector is studied in a dedicated fit which restricts the operators and
measurements to be directly related to top-quark. A small subset of
CP-violating operators involving bosonic fields alone are also investigated.
Various running scenarios for future e+e- and Muon Colliders that are suggested
in the Snowmass 2021 discussion are considered in the global fits. The outcomes
from each fit are expressed in terms of either direct constraint on Wilson
Coefficients or precision on Higgs and electroweak effective couplings.
| [
{
"created": "Thu, 16 Jun 2022 17:29:06 GMT",
"version": "v1"
},
{
"created": "Wed, 12 Oct 2022 21:50:20 GMT",
"version": "v2"
},
{
"created": "Thu, 1 Dec 2022 16:25:39 GMT",
"version": "v3"
},
{
"created": "Thu, 18 Jul 2024 04:19:47 GMT",
"version": "v4"
},
{
"cr... | 2024-07-22 | [
[
"de Blas",
"Jorge",
""
],
[
"Du",
"Yong",
""
],
[
"Grojean",
"Christophe",
""
],
[
"Gu",
"Jiayin",
""
],
[
"Miralles",
"Victor",
""
],
[
"Peskin",
"Michael E.",
""
],
[
"Tian",
"Junping",
""
],
[
"V... | Based on the framework of Standard Model Effective Field Theory, we performed a few global fits, each containing a subset of dimension-6 operators, for the measurements that are expected at future colliders. The fit for the Higgs and electroweak sector improves what has been done for the European Strategy Update in 2020 on both EFT treatments and experimental inputs. A new comprehensive fit is performed focusing on 4-fermion interactions at future colliders. Top-quark sector is studied in a dedicated fit which restricts the operators and measurements to be directly related to top-quark. A small subset of CP-violating operators involving bosonic fields alone are also investigated. Various running scenarios for future e+e- and Muon Colliders that are suggested in the Snowmass 2021 discussion are considered in the global fits. The outcomes from each fit are expressed in terms of either direct constraint on Wilson Coefficients or precision on Higgs and electroweak effective couplings. |
1709.06693 | Masaki J.S. Yang | Masaki J. S. Yang | Flavor structure from misalignment of inner products in noncommutative
geometry | 6pages, 1 table, the final version to appear in JHEP | JHEP 01 (2018) 023 | 10.1007/JHEP01(2018)023 | STUPP-17-231 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this letter, we consider an idea that induces flavor structure from inner
products in noncommutative geometry. Assuming proper components of vectors
$v_{(L,R) i}$ in enlarged representation space for fermions, we can induce the
waterfall texture for Yukawa matrices retaining gauge interactions are
universal. The hierarchy of the Yukawa interactions is a consequence of
"misalignment" between the vectors $v_{Li}$ and $v_{Rj}$.
| [
{
"created": "Wed, 20 Sep 2017 01:20:54 GMT",
"version": "v1"
},
{
"created": "Fri, 29 Dec 2017 04:15:48 GMT",
"version": "v2"
}
] | 2020-05-28 | [
[
"Yang",
"Masaki J. S.",
""
]
] | In this letter, we consider an idea that induces flavor structure from inner products in noncommutative geometry. Assuming proper components of vectors $v_{(L,R) i}$ in enlarged representation space for fermions, we can induce the waterfall texture for Yukawa matrices retaining gauge interactions are universal. The hierarchy of the Yukawa interactions is a consequence of "misalignment" between the vectors $v_{Li}$ and $v_{Rj}$. |
hep-ph/9407225 | Rmt | R. Mu\~noz-Tapia and W.J. Stirling | Angular Correlations and Light Gluinos in Multi-jet Photoproduction at
HERA | 13 pag + 8 figures, Durham preprint DTP/94/50, (LATEX) | Phys.Rev.D52:3894-3899,1995 | 10.1103/PhysRevD.52.3894 | null | hep-ph | null | A study of $3+1$ jet event photoproduction at HERA is presented. We define an
angular variable which is sensitive to the topology of the final state jets and
is therefore able to discriminate between the different contributing
subprocesses, and between QCD and an abelian gluon model. We also investigate
the contribution from the direct production of light gluinos to the $3+1$ cross
section.
| [
{
"created": "Tue, 5 Jul 1994 10:18:08 GMT",
"version": "v1"
}
] | 2011-07-19 | [
[
"Muñoz-Tapia",
"R.",
""
],
[
"Stirling",
"W. J.",
""
]
] | A study of $3+1$ jet event photoproduction at HERA is presented. We define an angular variable which is sensitive to the topology of the final state jets and is therefore able to discriminate between the different contributing subprocesses, and between QCD and an abelian gluon model. We also investigate the contribution from the direct production of light gluinos to the $3+1$ cross section. |
hep-ph/0606297 | De-Min Li | De-Min Li, Zhen Li | Strange axial-vector mesons mixing angle | 12 papes, to appear in Eur. Phys. J. A | Eur.Phys.J.A28:369-373,2006 | 10.1140/epja/i2006-10067-y | null | hep-ph | null | The masses of the $K_1(^3P_1)$ and $K_1(^1P_1)$ are considered in a
nonrelativistic constituent quark model, and the absolute value of the
$K_1(^3P_1)-K_1(^1P_1)$ mixing angle is determined to be about $59.29^\circ$.
Comparison of the theoretical predictions on the strong decay widths of the
$K_1(1270)$ and $K_1(1400)$ in the $^3P_0$ decay model as well as the
production ratio of these two states in the $\tau$ decay between the available
experimental data strongly favors that the $K_1(^3P_1)-K_1(^1P_1)$ mixing angle
is about $+59.29^\circ$.
| [
{
"created": "Thu, 29 Jun 2006 01:14:14 GMT",
"version": "v1"
}
] | 2009-11-11 | [
[
"Li",
"De-Min",
""
],
[
"Li",
"Zhen",
""
]
] | The masses of the $K_1(^3P_1)$ and $K_1(^1P_1)$ are considered in a nonrelativistic constituent quark model, and the absolute value of the $K_1(^3P_1)-K_1(^1P_1)$ mixing angle is determined to be about $59.29^\circ$. Comparison of the theoretical predictions on the strong decay widths of the $K_1(1270)$ and $K_1(1400)$ in the $^3P_0$ decay model as well as the production ratio of these two states in the $\tau$ decay between the available experimental data strongly favors that the $K_1(^3P_1)-K_1(^1P_1)$ mixing angle is about $+59.29^\circ$. |
1606.01862 | Armen Oganesian Gourgenovitcv | S. Khlebtsov, A. Oganesian, O. Teryaev | Analysis of the $e^{+}e^{-}\rightarrow\pi^{0}\gamma$ process using
anomaly sum rules approach | 15 pages, 5 figures, some misprints are corrected | null | 10.1134/S0021364016150017 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The process $e^{+}e^{-}\rightarrow\gamma^{*}\rightarrow \pi^{0}\gamma$ was
considered using time-like pion transition form factor, obtained in the
approach of the Anomaly Sum Rules(ASR). The total cross section and angular
distribution of the process was calculated. As the result of the comparison
with the data it was shown that ASR approach provides their good description in
the regions far from the pole. Also there was proposed a method allowing to
give reasonable description of data in the region of pole within the ASR
approach. The strong restrictions for the parameters of the modified ASR
approach were obtained.
| [
{
"created": "Mon, 6 Jun 2016 18:53:14 GMT",
"version": "v1"
},
{
"created": "Tue, 21 Jun 2016 15:54:05 GMT",
"version": "v2"
}
] | 2016-08-24 | [
[
"Khlebtsov",
"S.",
""
],
[
"Oganesian",
"A.",
""
],
[
"Teryaev",
"O.",
""
]
] | The process $e^{+}e^{-}\rightarrow\gamma^{*}\rightarrow \pi^{0}\gamma$ was considered using time-like pion transition form factor, obtained in the approach of the Anomaly Sum Rules(ASR). The total cross section and angular distribution of the process was calculated. As the result of the comparison with the data it was shown that ASR approach provides their good description in the regions far from the pole. Also there was proposed a method allowing to give reasonable description of data in the region of pole within the ASR approach. The strong restrictions for the parameters of the modified ASR approach were obtained. |
hep-ph/0103344 | Andrzej Zembrzuski | Maria Krawczyk and Andrzej Zembrzuski (Institute of Theoretical
Physics, Warsaw University, Poland) | The prompt photon photoproduction at THERA | latex file, 5 pages, 2 ps figures, to appear in "The THERA Book" | null | null | IFT 2001/10 | hep-ph | null | We present NLO QCD predictions for the prompt photon photoproduction at the
THERA, and compare them with results for the HERA collider.
| [
{
"created": "Fri, 30 Mar 2001 17:38:43 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Krawczyk",
"Maria",
"",
"Institute of Theoretical\n Physics, Warsaw University, Poland"
],
[
"Zembrzuski",
"Andrzej",
"",
"Institute of Theoretical\n Physics, Warsaw University, Poland"
]
] | We present NLO QCD predictions for the prompt photon photoproduction at the THERA, and compare them with results for the HERA collider. |
1110.4829 | Laurent Favart | F. A. Ceccopieri, L. Favart | QCD fits in diffractive DIS revisited | proceeding to PHOTON11 conference | null | null | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A new method of extracting diffractive parton distributions is presented
which avoids the use of Regge theory ansatz and is in much closer relation with
the factorization theorem for diffarctive hard processes.
| [
{
"created": "Fri, 21 Oct 2011 15:51:12 GMT",
"version": "v1"
}
] | 2011-10-24 | [
[
"Ceccopieri",
"F. A.",
""
],
[
"Favart",
"L.",
""
]
] | A new method of extracting diffractive parton distributions is presented which avoids the use of Regge theory ansatz and is in much closer relation with the factorization theorem for diffarctive hard processes. |
hep-ph/0408146 | Elvio Di Salvo | Elvio Di Salvo | Constraints on the Quark Correlation Matrix from Equations of Motion | 4 pages | null | null | null | hep-ph | null | We show that the Politzer theorem on the equations of motion implies strong
constraints on the quark correlation matrix, restricting the number of
independent distribution functions that characterize the internal structure of
the nucleon. Then we draw some important consequences from this result. First
of all, we suggest an alternative method for determining transversity.
Secondly, we predict the Q^2-dependence of some azimuthal asymmetries. Lastly,
we illustrate the origin of the main contributions to some twist-3 distribution
functions.
| [
{
"created": "Thu, 12 Aug 2004 08:18:38 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Di Salvo",
"Elvio",
""
]
] | We show that the Politzer theorem on the equations of motion implies strong constraints on the quark correlation matrix, restricting the number of independent distribution functions that characterize the internal structure of the nucleon. Then we draw some important consequences from this result. First of all, we suggest an alternative method for determining transversity. Secondly, we predict the Q^2-dependence of some azimuthal asymmetries. Lastly, we illustrate the origin of the main contributions to some twist-3 distribution functions. |
2310.19358 | Ya-Ping Xie | Ya-Ping Xie, S. V. Goloskokov and Xurong Chen | Extraction of information on transversity GPDs from $\pi^0$ and $\eta$
production on EIC of China | Proceedings of the SPIN-2023 conference | null | null | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The General Parton Distributions (GPDs) are applied to study the hard
Pseudoscalar Meson Production (PMP) at high energies. The PMP amplitudes are be
obtained within the GPDs factorization. They are expressed in terms of GPDs
convolution functions, which are most essential in PMP reactions. We show that
these convolution functions can be extracted from the PMP data in future EIC of
China (EicC). Predictions of $\pi^0$ and $\eta$ production at typical EicC
energies are performed.
| [
{
"created": "Mon, 30 Oct 2023 08:54:57 GMT",
"version": "v1"
},
{
"created": "Wed, 1 Nov 2023 00:00:20 GMT",
"version": "v2"
}
] | 2023-11-02 | [
[
"Xie",
"Ya-Ping",
""
],
[
"Goloskokov",
"S. V.",
""
],
[
"Chen",
"Xurong",
""
]
] | The General Parton Distributions (GPDs) are applied to study the hard Pseudoscalar Meson Production (PMP) at high energies. The PMP amplitudes are be obtained within the GPDs factorization. They are expressed in terms of GPDs convolution functions, which are most essential in PMP reactions. We show that these convolution functions can be extracted from the PMP data in future EIC of China (EicC). Predictions of $\pi^0$ and $\eta$ production at typical EicC energies are performed. |
hep-ph/0701171 | Graham Shore | G. M. Shore | The U(1)_A Anomaly and QCD Phenomenology | 50 pages, 17 figures | Lect.NotesPhys.737:235-288,2008 | null | SWAT 07-504 | hep-ph hep-th | null | The role of the $U(1)_A$ anomaly in QCD phenomenology is reviewed, focusing
on the relation between quark dynamics and gluon topology. Topics covered
include a generalisation of the Witten-Veneziano formula for the mass of the
$\eta'$, the determination of pseudoscalar meson decay constants, radiative
pseudoscalar decays and the $U(1)_A$ Goldberger-Treiman relation. Sum rules are
derived for the proton and photon structure functions $g_1^p$ and $g_1^\c$
measured in polarised deep-inelastic scattering. The first moment sum rule for
$g_1^p$ (the `proton spin' problem) is confronted with new data from COMPASS
and HERMES on the deuteron structure function and shown to be quantitatively
explained in terms of topological charge screening. Proposals for experiments
on semi-inclusive DIS and polarised two-photon physics at future $ep$ and
high-luminosity $e^+ e^-$ colliders are discussed.
| [
{
"created": "Sun, 21 Jan 2007 01:23:41 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Shore",
"G. M.",
""
]
] | The role of the $U(1)_A$ anomaly in QCD phenomenology is reviewed, focusing on the relation between quark dynamics and gluon topology. Topics covered include a generalisation of the Witten-Veneziano formula for the mass of the $\eta'$, the determination of pseudoscalar meson decay constants, radiative pseudoscalar decays and the $U(1)_A$ Goldberger-Treiman relation. Sum rules are derived for the proton and photon structure functions $g_1^p$ and $g_1^\c$ measured in polarised deep-inelastic scattering. The first moment sum rule for $g_1^p$ (the `proton spin' problem) is confronted with new data from COMPASS and HERMES on the deuteron structure function and shown to be quantitatively explained in terms of topological charge screening. Proposals for experiments on semi-inclusive DIS and polarised two-photon physics at future $ep$ and high-luminosity $e^+ e^-$ colliders are discussed. |
hep-ph/9701221 | null | L. Lavoura | A new type of spontaneous CP breaking | plain LATEX, 12 pages, no figures and no tables | Phys.Lett. B400 (1997) 152-156 | 10.1016/S0370-2693(97)00344-4 | FISIST/10-96/CFIF | hep-ph | null | I present a new form of spontaneous CP violation in which, in analogy with
the left-right-symmetric model, CP breaking results from the inequality of two
real vacuum expectation values. In my model there is no scalar-pseudoscalar
mixing, and the smallness of strong CP violation finds a natural explanation.
| [
{
"created": "Mon, 6 Jan 1997 14:26:42 GMT",
"version": "v1"
}
] | 2009-10-30 | [
[
"Lavoura",
"L.",
""
]
] | I present a new form of spontaneous CP violation in which, in analogy with the left-right-symmetric model, CP breaking results from the inequality of two real vacuum expectation values. In my model there is no scalar-pseudoscalar mixing, and the smallness of strong CP violation finds a natural explanation. |
hep-ph/0006029 | Abud Mario | M. Abud (U. of Naples), F. Buccella (CERN) | SO(10)-Inspired See-Saw Mechanism | 16 pages, 3 tables, LateX | Int.J.Mod.Phys. A16 (2001) 609-624 | 10.1142/S0217751X01003056 | null | hep-ph | null | We determine the nu_{R} Majorana mass matrix from the experimental data on
neutrino oscillations in the framework of a see-saw SO(10) model, where we
impose the condition (M^R)_{33} = 0 to avoid too large fine-tunings in the
see-saw formula. We find a class of solutions with the two lowest neutrino
masses almost degenerate and the scale of the matrix elements of M^R in the
range 10^{11} -10^{12} GeV in agreement with Pati-Salam intermediate symmetry.
We find also solutions with smaller neutrino masses, for which the scale of M_R
depends on the solution to the "solar neutrino problem" and on the value of the
component of \nu_e along the highest mass eigenstate, U_{e3}.
| [
{
"created": "Fri, 2 Jun 2000 14:55:36 GMT",
"version": "v1"
}
] | 2015-06-25 | [
[
"Abud",
"M.",
"",
"U. of Naples"
],
[
"Buccella",
"F.",
"",
"CERN"
]
] | We determine the nu_{R} Majorana mass matrix from the experimental data on neutrino oscillations in the framework of a see-saw SO(10) model, where we impose the condition (M^R)_{33} = 0 to avoid too large fine-tunings in the see-saw formula. We find a class of solutions with the two lowest neutrino masses almost degenerate and the scale of the matrix elements of M^R in the range 10^{11} -10^{12} GeV in agreement with Pati-Salam intermediate symmetry. We find also solutions with smaller neutrino masses, for which the scale of M_R depends on the solution to the "solar neutrino problem" and on the value of the component of \nu_e along the highest mass eigenstate, U_{e3}. |
1308.5069 | Yoshiharu Kawamura | Yoshiharu Kawamura | Naturalness, Conformal Symmetry and Duality | 16 pages; Some paragraphs added and typos corrected | null | 10.1093/ptep/ptt098 | null | hep-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We reconsider the naturalness from the viewpoint of effective field theories,
motivated by the alternative scenario that the standard model holds until a
high-energy scale such as the Planck scale. We propose a calculation scheme of
radiative corrections utilizing a hidden duality, in the expectation that the
unnaturalness for scalar masses might be an artifact in the effective theory
and it could be improved if features of an ultimate theory are taken in.
| [
{
"created": "Fri, 23 Aug 2013 08:35:37 GMT",
"version": "v1"
},
{
"created": "Wed, 28 Aug 2013 08:18:45 GMT",
"version": "v2"
},
{
"created": "Tue, 10 Sep 2013 04:35:03 GMT",
"version": "v3"
},
{
"created": "Mon, 21 Oct 2013 07:31:28 GMT",
"version": "v4"
}
] | 2014-05-07 | [
[
"Kawamura",
"Yoshiharu",
""
]
] | We reconsider the naturalness from the viewpoint of effective field theories, motivated by the alternative scenario that the standard model holds until a high-energy scale such as the Planck scale. We propose a calculation scheme of radiative corrections utilizing a hidden duality, in the expectation that the unnaturalness for scalar masses might be an artifact in the effective theory and it could be improved if features of an ultimate theory are taken in. |
hep-ph/9905252 | Nir Polonsky | Paul Langacker, Nir Polonsky, and Jing Wang | A low-energy solution to the mu-problem in gauge mediation | 17 pages. LaTex + RevTex. 3 figures (included). Includes a discussion
of the CP problem and its solution | Phys. Rev. D 60, 115005 (1999) | 10.1103/PhysRevD.60.115005 | UPR-844-T, RU--99--17 | hep-ph | null | In the gauge-mediation framework the soft supersymmetry breaking mass
parameters of the supersymmetric standard model are induced by the gauge
interactions of some messenger fields. The parameters exhibit flavor
universality which is dictated by the gauge interactions and which efficiently
eliminates new dangerous contributions to flavor changing neutral currents.
However, the Higgs potential in this framework typically contains an
unacceptable hierarchy between its dimensionful parameters (the $\mu$-problem
of gauge mediation). We show that the problem can be resolved if the Higgs
potential arises dynamically once an intermediate U(1)' sector is integrated
out rather than arising radiatively from some Yukawa interactions at the
messenger scale. As an added benefit, such models may naturally avoid new
contribution to CP violating amplitudes. The proposed framework is described,
explicit examples are given and its phenomenology is explored. The $\mu$
problem is resolved in this case by the low-energy U(1)' dynamics which could
be tested in future collider experiments.
| [
{
"created": "Wed, 5 May 1999 17:04:49 GMT",
"version": "v1"
},
{
"created": "Wed, 12 May 1999 16:50:24 GMT",
"version": "v2"
}
] | 2016-08-25 | [
[
"Langacker",
"Paul",
""
],
[
"Polonsky",
"Nir",
""
],
[
"Wang",
"Jing",
""
]
] | In the gauge-mediation framework the soft supersymmetry breaking mass parameters of the supersymmetric standard model are induced by the gauge interactions of some messenger fields. The parameters exhibit flavor universality which is dictated by the gauge interactions and which efficiently eliminates new dangerous contributions to flavor changing neutral currents. However, the Higgs potential in this framework typically contains an unacceptable hierarchy between its dimensionful parameters (the $\mu$-problem of gauge mediation). We show that the problem can be resolved if the Higgs potential arises dynamically once an intermediate U(1)' sector is integrated out rather than arising radiatively from some Yukawa interactions at the messenger scale. As an added benefit, such models may naturally avoid new contribution to CP violating amplitudes. The proposed framework is described, explicit examples are given and its phenomenology is explored. The $\mu$ problem is resolved in this case by the low-energy U(1)' dynamics which could be tested in future collider experiments. |
0810.1112 | Mikko Laine | M. Laine | How to compute the thermal quarkonium spectral function from first
principles? | 8 pages; to appear in the Proceedings of SEWM08, Amsterdam, the
Netherlands, August 26-29, 2008 | null | 10.1016/j.nuclphysa.2009.01.015 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In the limit of a high temperature T and a large quark-mass M, implying a
small gauge coupling g, the heavy quark contribution to the spectral function
of the electromagnetic current can be computed systematically in the
weak-coupling expansion. We argue that the scale hierarchy relevant for
addressing the disappearance ("melting") of the resonance peak from the
spectral function reads M >> T > g^2 M > gT >> g^4 M, and review how the heavy
scales can be integrated out one-by-one, to construct a set of effective field
theories describing the low-energy dynamics. The parametric behaviour of the
melting temperature in the weak-coupling limit is specified.
| [
{
"created": "Tue, 7 Oct 2008 07:41:04 GMT",
"version": "v1"
}
] | 2009-11-13 | [
[
"Laine",
"M.",
""
]
] | In the limit of a high temperature T and a large quark-mass M, implying a small gauge coupling g, the heavy quark contribution to the spectral function of the electromagnetic current can be computed systematically in the weak-coupling expansion. We argue that the scale hierarchy relevant for addressing the disappearance ("melting") of the resonance peak from the spectral function reads M >> T > g^2 M > gT >> g^4 M, and review how the heavy scales can be integrated out one-by-one, to construct a set of effective field theories describing the low-energy dynamics. The parametric behaviour of the melting temperature in the weak-coupling limit is specified. |
0807.0548 | Grigorios Chachamis | G. Chachamis | High Precision Gauge Boson Pair Production at the LHC | Presented at DIS2008: 16th International Workshop on Deep-Inelastic
Scattering and Related Subjects, 7-11 April 2008, University College London,
UK, 4 pages, 1 figure | null | null | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We discuss the recent derivation of the two loop virtual QCD corrections to
the W boson pair production in the quark-anti-quark-annihilation channel in the
limit where all kinematical invariants are large compared to the mass of the W
boson. In particular, we describe the use of the PSLQ algorithm on an example
integral.
| [
{
"created": "Thu, 3 Jul 2008 17:56:39 GMT",
"version": "v1"
}
] | 2008-07-04 | [
[
"Chachamis",
"G.",
""
]
] | We discuss the recent derivation of the two loop virtual QCD corrections to the W boson pair production in the quark-anti-quark-annihilation channel in the limit where all kinematical invariants are large compared to the mass of the W boson. In particular, we describe the use of the PSLQ algorithm on an example integral. |
2112.06937 | Alfonso Garcia Soto | Alfonso Garcia Soto, Pavel Zhelnin, Ibrahim Safa, and Carlos A.
Arg\"uelles | Tau Appearance from High-Energy Neutrino Interactions | 7+2 pages. 4+2 figures. 1 table | Phys. Rev. Lett. 128, 171101 (2022) | 10.1103/PhysRevLett.128.171101 | null | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | High-energy muon- and electron-neutrinos yield a non-negligible flux of tau
neutrinos as they propagate through Earth. In this letter, we address the
impact of this additional component in the PeV and EeV energy regimes for the
first time. This contribution is predicted to be significantly larger than the
atmospheric background above 300 TeV, and alters current and future neutrino
telescopes' capabilities to discover a cosmic tau-neutrino flux. Further we
demonstrate that Earthskimming neutrino experiments, designed to observe tau
neutrinos, will be sensitive to cosmogenic neutrinos even in extreme scenarios
without a primary tau-neutrino component.
| [
{
"created": "Mon, 13 Dec 2021 19:00:01 GMT",
"version": "v1"
},
{
"created": "Mon, 20 Dec 2021 19:27:32 GMT",
"version": "v2"
}
] | 2022-04-28 | [
[
"Soto",
"Alfonso Garcia",
""
],
[
"Zhelnin",
"Pavel",
""
],
[
"Safa",
"Ibrahim",
""
],
[
"Argüelles",
"Carlos A.",
""
]
] | High-energy muon- and electron-neutrinos yield a non-negligible flux of tau neutrinos as they propagate through Earth. In this letter, we address the impact of this additional component in the PeV and EeV energy regimes for the first time. This contribution is predicted to be significantly larger than the atmospheric background above 300 TeV, and alters current and future neutrino telescopes' capabilities to discover a cosmic tau-neutrino flux. Further we demonstrate that Earthskimming neutrino experiments, designed to observe tau neutrinos, will be sensitive to cosmogenic neutrinos even in extreme scenarios without a primary tau-neutrino component. |
hep-ph/9902460 | Hiroshi Nunokawa | Hisakazu Minakata and Hiroshi Nunokawa | Model Independent Analysis of the Solar Neutrino Data | LaTex, 10 pages, 7 postscript figures, Talk presented by H. Nunokawa
at the symposium, "New Era in Neutrino Physics", Tokyo Metropolitan
University, Japan, 11-12 June 1998, to be published in the proceedings | null | null | null | hep-ph | null | We perform an updated model-independent analysis using all the latest solar
neutrino data, including the one coming from remarkably high statistics
SuperKamiokande experiment. We confirm that the astrophysical solutions to the
solar neutrino problem are extremely disfavored. We also present a new way of
illuminating the suppression pattern of various solar neutrino flux, which
indicates that the strong suppression of $^{7}$Be neutrinos is no more true
once the neutrino flavor conversion is taken into account.
| [
{
"created": "Thu, 25 Feb 1999 00:07:40 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Minakata",
"Hisakazu",
""
],
[
"Nunokawa",
"Hiroshi",
""
]
] | We perform an updated model-independent analysis using all the latest solar neutrino data, including the one coming from remarkably high statistics SuperKamiokande experiment. We confirm that the astrophysical solutions to the solar neutrino problem are extremely disfavored. We also present a new way of illuminating the suppression pattern of various solar neutrino flux, which indicates that the strong suppression of $^{7}$Be neutrinos is no more true once the neutrino flavor conversion is taken into account. |
2209.08146 | Alan Chodos | Alan Chodos | Tachyons as a Consequence of Light-Cone Reflection Symmetry | To be published in Symmetry special issue: "Tachyons and Fundamental
Symmetries" | null | null | null | hep-ph hep-th | http://creativecommons.org/licenses/by/4.0/ | We introduce a new symmetry, Light-Cone Reflection (LCR), which interchanges
timelike and spacelike intervals. Our motivation is to provide a reason, based
on symmetry, why tachyons might exist, with emphasis on application to
neutrinos. We show that LCR, combined with translations, leads to a much larger
symmetry. We construct an LCR-invariant Lagrangian, and discuss some of its
properties. In a simple example, we find complete symmetry in the spectrum
between tachyons and ordinary particles. We also show that the theory allows
for the introduction of a further gauge invariance related to chiral symmetry.
| [
{
"created": "Fri, 16 Sep 2022 19:35:43 GMT",
"version": "v1"
}
] | 2022-09-20 | [
[
"Chodos",
"Alan",
""
]
] | We introduce a new symmetry, Light-Cone Reflection (LCR), which interchanges timelike and spacelike intervals. Our motivation is to provide a reason, based on symmetry, why tachyons might exist, with emphasis on application to neutrinos. We show that LCR, combined with translations, leads to a much larger symmetry. We construct an LCR-invariant Lagrangian, and discuss some of its properties. In a simple example, we find complete symmetry in the spectrum between tachyons and ordinary particles. We also show that the theory allows for the introduction of a further gauge invariance related to chiral symmetry. |
2308.05000 | Istv\'an Szanyi | T. Cs\"org\H{o}, S. Hegyi, I. Szanyi | L\'evy $\alpha$-stable model for the non-exponential low-$|t|$
proton-proton differential cross section | 13 pages, 2 figures | Universe 2023, 9(8), 361 | 10.3390/universe9080361 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | It is known that the Real Extended Bialas-Bzdak (ReBB) model describes the
proton-proton ($pp$) and proton-antiproton ($p\bar p$) differential
cross-section data in a statistically non-excludible way,\linebreak i.e., with
a confidence level greater than or equal to 0.1\% in the center of mass energy
range \linebreak 546 GeV $\leq\sqrt{s}\leq$ 8 TeV and in the squared
four-momentum transfer range 0.37 GeV$^2$ $\leq -t\leq$ 1.2 GeV$^2$.
Considering, instead of Gaussian, a more general L\'evy $\alpha$-stable shape
for the parton distributions of the constituent quark and diquark inside the
proton and for the relative separation between them, a generalized description
of data is obtained, where the ReBB model corresponds to the $\alpha =$ 2
special case. Extending the model to $\alpha <$ 2, we conjecture that the
validity of the model can be extended to a wider kinematic range, in
particular, to lower values of the four-momentum transfer $-t$. We present the
formal L\'evy $\alpha$-stable generalization of the Bialas-Bzdak model and show
that a simplified version of this model can be successfully fitted, with
$\alpha<$ 2, to the non-exponential, low $-t$ differential cross-section data
of elastic proton-proton scattering at $\sqrt{s} =$ 8 TeV.
| [
{
"created": "Wed, 9 Aug 2023 14:58:25 GMT",
"version": "v1"
}
] | 2023-08-10 | [
[
"Csörgő",
"T.",
""
],
[
"Hegyi",
"S.",
""
],
[
"Szanyi",
"I.",
""
]
] | It is known that the Real Extended Bialas-Bzdak (ReBB) model describes the proton-proton ($pp$) and proton-antiproton ($p\bar p$) differential cross-section data in a statistically non-excludible way,\linebreak i.e., with a confidence level greater than or equal to 0.1\% in the center of mass energy range \linebreak 546 GeV $\leq\sqrt{s}\leq$ 8 TeV and in the squared four-momentum transfer range 0.37 GeV$^2$ $\leq -t\leq$ 1.2 GeV$^2$. Considering, instead of Gaussian, a more general L\'evy $\alpha$-stable shape for the parton distributions of the constituent quark and diquark inside the proton and for the relative separation between them, a generalized description of data is obtained, where the ReBB model corresponds to the $\alpha =$ 2 special case. Extending the model to $\alpha <$ 2, we conjecture that the validity of the model can be extended to a wider kinematic range, in particular, to lower values of the four-momentum transfer $-t$. We present the formal L\'evy $\alpha$-stable generalization of the Bialas-Bzdak model and show that a simplified version of this model can be successfully fitted, with $\alpha<$ 2, to the non-exponential, low $-t$ differential cross-section data of elastic proton-proton scattering at $\sqrt{s} =$ 8 TeV. |
1410.6808 | Nathaniel Craig | Nathaniel Craig, Simon Knapen, Pietro Longhi | Neutral Naturalness from the Orbifold Higgs | 5 pages, 1 figure | Phys. Rev. Lett. 114, 061803 (2015) | 10.1103/PhysRevLett.114.061803 | RU-NHETC-2014-15 | hep-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present a general class of natural theories in which the Higgs is a
pseudo-goldstone boson in an orbifolded gauge theory. The symmetry protecting
the Higgs at low energies is an accidental global symmetry of the quadratic
action, rather than a full continuous symmetry. The lightest degrees of freedom
protecting the weak scale carry no Standard Model (SM) quantum numbers and
interact with visible matter principally through the Higgs portal. We find that
the twin Higgs is the simplest example of an orbifold Higgs. This opens the
door to the systematic study of "neutral naturalness": natural theories with
SM-neutral states that are as yet untested by the LHC.
| [
{
"created": "Fri, 24 Oct 2014 20:00:05 GMT",
"version": "v1"
}
] | 2015-03-05 | [
[
"Craig",
"Nathaniel",
""
],
[
"Knapen",
"Simon",
""
],
[
"Longhi",
"Pietro",
""
]
] | We present a general class of natural theories in which the Higgs is a pseudo-goldstone boson in an orbifolded gauge theory. The symmetry protecting the Higgs at low energies is an accidental global symmetry of the quadratic action, rather than a full continuous symmetry. The lightest degrees of freedom protecting the weak scale carry no Standard Model (SM) quantum numbers and interact with visible matter principally through the Higgs portal. We find that the twin Higgs is the simplest example of an orbifold Higgs. This opens the door to the systematic study of "neutral naturalness": natural theories with SM-neutral states that are as yet untested by the LHC. |
hep-ph/0405014 | P. Q. Hung | S. Liuti and S.K. Taneja | Generalized Parton Distributions and Color Transparency | 30 pages, 13 figures | Phys.Rev. D70 (2004) 074019 | 10.1103/PhysRevD.70.074019 | null | hep-ph | null | We study the structure of generalized parton distributions in impact
parameter space with the aim of determining the size and role of small
transverse separations components in the quarks wave function. We analyze the
relation between transverse momentum components and transverse separations.
Wave functions with large transverse momentum components can simultaneously
reproduce the behavior of the Dirac form factor at large momentum transfer, and
of the deep inelastic structure functions at Bjorken x -> 1. The presence of
large momentum components does not ensure, however, the dominance of small
transverse distances at large x. We suggest that experiments measuring the
attenuation of hadrons in the nuclear medium, or the onset of color
transparency, can provide an alternative source of information on generalized
parton distributions, by mapping out the behavior of the transverse components
of the wave function.
| [
{
"created": "Mon, 3 May 2004 14:44:57 GMT",
"version": "v1"
},
{
"created": "Wed, 5 May 2004 18:40:05 GMT",
"version": "v2"
}
] | 2009-11-10 | [
[
"Liuti",
"S.",
""
],
[
"Taneja",
"S. K.",
""
]
] | We study the structure of generalized parton distributions in impact parameter space with the aim of determining the size and role of small transverse separations components in the quarks wave function. We analyze the relation between transverse momentum components and transverse separations. Wave functions with large transverse momentum components can simultaneously reproduce the behavior of the Dirac form factor at large momentum transfer, and of the deep inelastic structure functions at Bjorken x -> 1. The presence of large momentum components does not ensure, however, the dominance of small transverse distances at large x. We suggest that experiments measuring the attenuation of hadrons in the nuclear medium, or the onset of color transparency, can provide an alternative source of information on generalized parton distributions, by mapping out the behavior of the transverse components of the wave function. |
1506.08999 | Alexander V. Kuznetsov | A.V. Kuznetsov, A.A. Okrugin, A.M. Shitova (Yaroslavl State P.G.
Demidov University, Russia) | Propagators of charged particles in an external magnetic field, expanded
over Landau levels | 14 pages, LaTeX, to appear in Int. J. Mod. Phys. A; version 2:
misprint corrected, conclusions unchanged; version 3: note and reference
added | Int. J. Mod. Phys. A, Vol. 30 (2015) 1550140 (15 pages) | 10.1142/S0217751X15501407 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Various forms of expressions for the propagators of charged particles in a
constant magnetic field that should be used for investigations of electroweak
processes in external uniform magnetic field are discussed. Formulas for the
propagators of the Standard Model charged $W$- and scalar $\Phi$-bosons in an
arbitrary $\xi$-gauge, expanded over Landau levels, are derived for the first
time.
| [
{
"created": "Tue, 30 Jun 2015 09:11:41 GMT",
"version": "v1"
},
{
"created": "Fri, 31 Jul 2015 15:17:50 GMT",
"version": "v2"
},
{
"created": "Wed, 5 Aug 2015 10:58:16 GMT",
"version": "v3"
}
] | 2015-08-06 | [
[
"Kuznetsov",
"A. V.",
"",
"Yaroslavl State P.G.\n Demidov University, Russia"
],
[
"Okrugin",
"A. A.",
"",
"Yaroslavl State P.G.\n Demidov University, Russia"
],
[
"Shitova",
"A. M.",
"",
"Yaroslavl State P.G.\n Demidov University, Russia"
]
] | Various forms of expressions for the propagators of charged particles in a constant magnetic field that should be used for investigations of electroweak processes in external uniform magnetic field are discussed. Formulas for the propagators of the Standard Model charged $W$- and scalar $\Phi$-bosons in an arbitrary $\xi$-gauge, expanded over Landau levels, are derived for the first time. |
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