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|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
hep-ph/0108043 | Michele Maltoni | N. Fornengo, M. Maltoni, R. Tomas, J.W.F. Valle | Probing neutrino non-standard interactions with atmospheric neutrino
data | 26 pages, LaTeX file using REVTeX4, 1 table and 12 figures included.
Added a revised analysis which takes into account the new 1489-day
Super-Kamiokande and final MACRO data. The bound on NSI parameters is
considerably improved | Phys.Rev.D65:013010,2002 | 10.1103/PhysRevD.65.013010 | IFIC/01-41, DFTT-21/2001 | hep-ph astro-ph hep-ex | null | We have reconsidered the atmospheric neutrino anomaly in light of the laetst
data from Super-Kamiokande contained events and from Super-Kamiokande and MACRO
up-going muons. We have reanalysed the proposed solution to the atmospheric
neutrino anomaly in terms of non-standard neutrino-matter interactions (NSI) as
well as the standard nu_mu -> nu_tau oscillations (OSC). Our statistical
analysis shows that a pure NSI mechanism is now ruled out at 99%, while the
standard nu_mu -> nu_tau OSC mechanism provides a quite remarkably good
description of the anomaly. We therefore study an extended mechanism of
neutrino propagation which combines both oscillation and non-standard
neutrino-matter interactions, in order to derive limits on flavour-changing
(FC) and non-universal (NU) neutrino interactions. We obtain that the
off-diagonal flavour-changing neutrino parameter epsilon and the diagonal
non-universality neutrino parameter epsilon' are confined to -0.03 < epsilon <
0.02 and |epsilon'| < 0.05 at 99.73% CL. These limits are model independent and
they are obtained from pure neutrino-physics processes. The stability of the
neutrino oscillation solution to the atmospheric neutrino anomaly against the
presence of non-standard neutrino interactions establishes the robustness of
the near-maximal atmospheric mixing and massive-neutrino hypothesis. The best
agreement with the data is obtained for Delta_m^2 = 2.3*10^{-3} eV^2,
sin^2(2*theta) = 1, epsilon = 6.7*10^{-3} and epsilon' = 1.1*10^{-3}, although
the chi^2 function is quite flat in the epsilon and epsilon' directions for
epsilon, epsilon' -> 0.
| [
{
"created": "Sat, 4 Aug 2001 00:37:54 GMT",
"version": "v1"
},
{
"created": "Wed, 10 Oct 2001 12:52:57 GMT",
"version": "v2"
},
{
"created": "Fri, 14 Feb 2003 17:33:47 GMT",
"version": "v3"
}
] | 2010-05-28 | [
[
"Fornengo",
"N.",
""
],
[
"Maltoni",
"M.",
""
],
[
"Tomas",
"R.",
""
],
[
"Valle",
"J. W. F.",
""
]
] | We have reconsidered the atmospheric neutrino anomaly in light of the laetst data from Super-Kamiokande contained events and from Super-Kamiokande and MACRO up-going muons. We have reanalysed the proposed solution to the atmospheric neutrino anomaly in terms of non-standard neutrino-matter interactions (NSI) as well as the standard nu_mu -> nu_tau oscillations (OSC). Our statistical analysis shows that a pure NSI mechanism is now ruled out at 99%, while the standard nu_mu -> nu_tau OSC mechanism provides a quite remarkably good description of the anomaly. We therefore study an extended mechanism of neutrino propagation which combines both oscillation and non-standard neutrino-matter interactions, in order to derive limits on flavour-changing (FC) and non-universal (NU) neutrino interactions. We obtain that the off-diagonal flavour-changing neutrino parameter epsilon and the diagonal non-universality neutrino parameter epsilon' are confined to -0.03 < epsilon < 0.02 and |epsilon'| < 0.05 at 99.73% CL. These limits are model independent and they are obtained from pure neutrino-physics processes. The stability of the neutrino oscillation solution to the atmospheric neutrino anomaly against the presence of non-standard neutrino interactions establishes the robustness of the near-maximal atmospheric mixing and massive-neutrino hypothesis. The best agreement with the data is obtained for Delta_m^2 = 2.3*10^{-3} eV^2, sin^2(2*theta) = 1, epsilon = 6.7*10^{-3} and epsilon' = 1.1*10^{-3}, although the chi^2 function is quite flat in the epsilon and epsilon' directions for epsilon, epsilon' -> 0. |
1610.08683 | Carlos E. Yaguna | Carlos E. Yaguna | Isospin-violating dark matter in the light of recent data | 20 pages, 9 figures | Phys. Rev. D 95, 055015 (2017) | 10.1103/PhysRevD.95.055015 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In scenarios where the dark matter interacts differently with protons and
neutrons (isospin-violating dark matter), the interpretation of the
experimental limits on the dark matter spin-independent cross section may be
significantly modified. On the one hand, the direct detection constraints are
shifted depending on the target nucleus, possibly changing the hierarchy among
different experiments. On the other hand, the relative strength between the
bounds from neutrino detectors and those from direct detection experiments is
altered, allowing the former to be more competitive. In this paper, the status
of isospin-violating dark matter is assessed in the light of recent data, and
the prospects for its detection in the near future are analyzed. We find, for
example, that there are regions in the parameter space where IceCube currently
provides the most stringent limits on the spin-independent cross section, or
others where the expected sensitivity of DEAP-3600 is well above the LUX
exclusion limit. Our results highlight the complementarity among different
targets in direct detection experiments, and between direct detection and
neutrino searches in the quest for a dark matter signal.
| [
{
"created": "Thu, 27 Oct 2016 09:52:28 GMT",
"version": "v1"
}
] | 2017-03-22 | [
[
"Yaguna",
"Carlos E.",
""
]
] | In scenarios where the dark matter interacts differently with protons and neutrons (isospin-violating dark matter), the interpretation of the experimental limits on the dark matter spin-independent cross section may be significantly modified. On the one hand, the direct detection constraints are shifted depending on the target nucleus, possibly changing the hierarchy among different experiments. On the other hand, the relative strength between the bounds from neutrino detectors and those from direct detection experiments is altered, allowing the former to be more competitive. In this paper, the status of isospin-violating dark matter is assessed in the light of recent data, and the prospects for its detection in the near future are analyzed. We find, for example, that there are regions in the parameter space where IceCube currently provides the most stringent limits on the spin-independent cross section, or others where the expected sensitivity of DEAP-3600 is well above the LUX exclusion limit. Our results highlight the complementarity among different targets in direct detection experiments, and between direct detection and neutrino searches in the quest for a dark matter signal. |
hep-ph/0501172 | Artem Lipatov | A.V. Lipatov, N.P. Zotov | Higgs boson production at hadron colliders in the k_T-factorization
approach | 20 pages, 9 figures | Eur.Phys.J.C44:559-566,2005 | 10.1140/epjc/s2005-02393-7 | null | hep-ph | null | We consider the Higgs boson production at high energy hadron colliders in the
framework of the k_T-factorization approach. The attention is focused on the
dominant gluon-gluon fusion subprocess. We calculate the total cross section
and transverse momentum distributions of the inclusive Higgs production using
unintegrated gluon distributions in a proton obtained from the full CCFM
evolution equation. We show that k_T-factorization gives a possibility to
investigate the associated Higgs boson and jets production. We calculate the
transverse momentum distributions and study the Higgs-jet and jet-jet azimuthal
correlations in the Higgs + one or two jet production processes. We demonstrate
the importance of the higher-order corrections within the k_T-factorization
approach. These corrections should be developed and taken into account in the
future applications.
| [
{
"created": "Tue, 18 Jan 2005 20:07:43 GMT",
"version": "v1"
}
] | 2009-01-07 | [
[
"Lipatov",
"A. V.",
""
],
[
"Zotov",
"N. P.",
""
]
] | We consider the Higgs boson production at high energy hadron colliders in the framework of the k_T-factorization approach. The attention is focused on the dominant gluon-gluon fusion subprocess. We calculate the total cross section and transverse momentum distributions of the inclusive Higgs production using unintegrated gluon distributions in a proton obtained from the full CCFM evolution equation. We show that k_T-factorization gives a possibility to investigate the associated Higgs boson and jets production. We calculate the transverse momentum distributions and study the Higgs-jet and jet-jet azimuthal correlations in the Higgs + one or two jet production processes. We demonstrate the importance of the higher-order corrections within the k_T-factorization approach. These corrections should be developed and taken into account in the future applications. |
hep-ph/0604003 | Yuji Koike | Hisato Eguchi, Yuji Koike (Niigata Univ.), Kazuhiro Tanaka (Juntendo
Univ.) | Single Transverse Spin Asymmetry for Large-p_T Pion Production in
Semi-Inclusive Deep Inelastic Scattering | 19 pages in LaTex. Some discussions added. To appear in Nucl. Phys. B | Nucl.Phys.B752:1-17,2006 | 10.1016/j.nuclphysb.2006.05.036 | null | hep-ph | null | We study the single spin asymmetry (SSA) for the pion production with large
transverse momentum p_T in semi-inclusive deep inelastic scattering
$ep^\uparrow\to e\pi X$. We derive the twist-3 cross section formula for SSA,
focussing on the soft-gluon-pole contributions associated with the twist-3
distribution for the nucleon and with the twist-3 fragmentation function for
the pion. We present a simple estimate of the asymmetries due to each twist-3
effect from nucleon and pion, respectively, by fixing the overall strength of
the relevant nonperturbative quantities by the data on the SSA A_N in
$p^\uparrow p\to\pi X$ collision.
| [
{
"created": "Sun, 2 Apr 2006 00:09:08 GMT",
"version": "v1"
},
{
"created": "Wed, 17 May 2006 08:54:16 GMT",
"version": "v2"
}
] | 2008-11-26 | [
[
"Eguchi",
"Hisato",
"",
"Niigata Univ."
],
[
"Koike",
"Yuji",
"",
"Niigata Univ."
],
[
"Tanaka",
"Kazuhiro",
"",
"Juntendo\n Univ."
]
] | We study the single spin asymmetry (SSA) for the pion production with large transverse momentum p_T in semi-inclusive deep inelastic scattering $ep^\uparrow\to e\pi X$. We derive the twist-3 cross section formula for SSA, focussing on the soft-gluon-pole contributions associated with the twist-3 distribution for the nucleon and with the twist-3 fragmentation function for the pion. We present a simple estimate of the asymmetries due to each twist-3 effect from nucleon and pion, respectively, by fixing the overall strength of the relevant nonperturbative quantities by the data on the SSA A_N in $p^\uparrow p\to\pi X$ collision. |
2011.07214 | Chen Rui | Rui Chen | Can the newly $P_{cs}(4459)$ be a strange hidden-charm
$\Xi_c\bar{D}^{*}$ molecular pentaquarks? | 7 Pages, 2 figures | Phys. Rev. D 103, 054007 (2021) | 10.1103/PhysRevD.103.054007 | null | hep-ph | http://creativecommons.org/licenses/by/4.0/ | Stimulated by the $P_{cs}(4459)$ reported by the LHCb Collaboration, we
perform a single $\Xi_c\bar{D}^*$ channel and a coupled
$\Xi_c\bar{D}^*/\Xi_c^*\bar{D}/\Xi_c^{\prime}\bar{D}^*/\Xi_c^*\bar{D}^*$
channel analysis by using a one-boson-exchange model. Our results indicate that
the newly $P_{cs}(4459)$ cannot be a pure $\Xi_c\bar{D}^*$ molecular state, but
a coupled
$\Xi_c\bar{D}^*/\Xi_c^*\bar{D}/\Xi_c^{\prime}\bar{D}^*/\Xi_c^*\bar{D}^*$ bound
state with $I(J^P)=0(3/2^-)$, where the $\Xi_c\bar{D}^*$ and $\Xi_c^*\bar{D}$
components are dominant. Meanwhile, we find the interactions from the
$\Xi_c^{\prime}\bar{D}^*$ system with $0(1/2^-)$, the $\Xi_c^{*}\bar{D}$ system
with $1(3/2^-)$, and the $\Xi_c^{*}\bar{D}^*$ system with $1(1/2^-)$ are
strongly attractive, where one can expect possible strange hidden-charm
molecular or resonant structures near the these thresholds with the assigned
quantum numbers.
| [
{
"created": "Sat, 14 Nov 2020 03:40:55 GMT",
"version": "v1"
}
] | 2021-03-10 | [
[
"Chen",
"Rui",
""
]
] | Stimulated by the $P_{cs}(4459)$ reported by the LHCb Collaboration, we perform a single $\Xi_c\bar{D}^*$ channel and a coupled $\Xi_c\bar{D}^*/\Xi_c^*\bar{D}/\Xi_c^{\prime}\bar{D}^*/\Xi_c^*\bar{D}^*$ channel analysis by using a one-boson-exchange model. Our results indicate that the newly $P_{cs}(4459)$ cannot be a pure $\Xi_c\bar{D}^*$ molecular state, but a coupled $\Xi_c\bar{D}^*/\Xi_c^*\bar{D}/\Xi_c^{\prime}\bar{D}^*/\Xi_c^*\bar{D}^*$ bound state with $I(J^P)=0(3/2^-)$, where the $\Xi_c\bar{D}^*$ and $\Xi_c^*\bar{D}$ components are dominant. Meanwhile, we find the interactions from the $\Xi_c^{\prime}\bar{D}^*$ system with $0(1/2^-)$, the $\Xi_c^{*}\bar{D}$ system with $1(3/2^-)$, and the $\Xi_c^{*}\bar{D}^*$ system with $1(1/2^-)$ are strongly attractive, where one can expect possible strange hidden-charm molecular or resonant structures near the these thresholds with the assigned quantum numbers. |
hep-ph/9512436 | Lev Okun | L. Okun | Leptons and Photons | 8 pages, Latex, apart from a few minor corrections, a short
description of two anomaly-free schemes with leptonic photons is added | Phys.Lett. B382 (1996) 389-392 | 10.1016/0370-2693(96)00586-2 | ITEP 68-95 | hep-ph | null | It is assumed that three lepton families $(\nu_e, e)$, $(\nu_{\mu}, \mu)$,
$(\nu_{\tau}, \tau)$ carry charges, which are sources of electronic, muonic and
tauonic massless vector particles, respectively. Various manifestations of
these hypothetical photons are discussed.
| [
{
"created": "Thu, 28 Dec 1995 15:45:13 GMT",
"version": "v1"
},
{
"created": "Wed, 20 Mar 1996 13:52:12 GMT",
"version": "v2"
}
] | 2009-10-28 | [
[
"Okun",
"L.",
""
]
] | It is assumed that three lepton families $(\nu_e, e)$, $(\nu_{\mu}, \mu)$, $(\nu_{\tau}, \tau)$ carry charges, which are sources of electronic, muonic and tauonic massless vector particles, respectively. Various manifestations of these hypothetical photons are discussed. |
1012.0015 | Cheuk-Yin Wong | Cheuk-Yin Wong | Foundation of Hydrodynamics for Systems with Strong Interactions | 10 pages, lecture presented at the Relativistic Fluids Symposium in
the IV Mexican Meeting on Mathematical and Experimental Physics, Mexico City,
Mexico, July 13-19, 2010 | AIP Conf.Proc.1312:39-48,2010 | 10.1063/1.3533204 | null | hep-ph nucl-th quant-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | For a dense and strongly interacting system, such as a nucleus or a
strongly-coupled quark-gluon plasma, the foundation of hydrodynamics can be
better found in the quantum description of constituents moving in the strong
mean fields generated by all other particles. Using the result that the
Schroedinger equation and the Klein-Gordon equation can be written in
hydrodynamical forms, we find that the probability currents of the many-body
system in the mean-field description obey a hydrodynamical equation with stress
tensors arising from many contributions: quantum effects, mean-field
interactions, and thermal fluctuations. The influence of various contributions
to the hydrodynamical motion is expected to vary with the temperature, as the
quantum and mean-field stress tensors playing more important roles at low and
moderate temperatures.
| [
{
"created": "Tue, 30 Nov 2010 21:13:07 GMT",
"version": "v1"
}
] | 2011-09-08 | [
[
"Wong",
"Cheuk-Yin",
""
]
] | For a dense and strongly interacting system, such as a nucleus or a strongly-coupled quark-gluon plasma, the foundation of hydrodynamics can be better found in the quantum description of constituents moving in the strong mean fields generated by all other particles. Using the result that the Schroedinger equation and the Klein-Gordon equation can be written in hydrodynamical forms, we find that the probability currents of the many-body system in the mean-field description obey a hydrodynamical equation with stress tensors arising from many contributions: quantum effects, mean-field interactions, and thermal fluctuations. The influence of various contributions to the hydrodynamical motion is expected to vary with the temperature, as the quantum and mean-field stress tensors playing more important roles at low and moderate temperatures. |
hep-ph/9411279 | null | L. Ya. Glozman, D.O. Riska | The Baryon Spectrum and Chiral Dynamics | 10 pages, latex, Configuration of Sigma(1750) changed, numerical
values accordingly revised, misprints corrected | PiN Newslett.10:115-120,1995 | null | HU-TFT-94-47 | hep-ph | null | The fine structure of the low energy part of the nucleon and strange hyperon
spectra, which are formed of single states without parity doublets, may be
understood in terms of an $SU(3)$ flavor-symmetric quark-quark interaction that
describes chiral pseudoscalar boson exchange. The model predicts the fine
structure splittings within 10-30\% of their empirical values and provides an
explanation of the reversed ordering of the lowest positive and negative parity
resonances in the nucleon and the $\Lambda$ hyperon spectra.
| [
{
"created": "Sat, 12 Nov 1994 13:53:11 GMT",
"version": "v1"
},
{
"created": "Sun, 13 Nov 1994 23:20:53 GMT",
"version": "v2"
},
{
"created": "Thu, 22 Dec 1994 13:14:47 GMT",
"version": "v3"
}
] | 2011-04-20 | [
[
"Glozman",
"L. Ya.",
""
],
[
"Riska",
"D. O.",
""
]
] | The fine structure of the low energy part of the nucleon and strange hyperon spectra, which are formed of single states without parity doublets, may be understood in terms of an $SU(3)$ flavor-symmetric quark-quark interaction that describes chiral pseudoscalar boson exchange. The model predicts the fine structure splittings within 10-30\% of their empirical values and provides an explanation of the reversed ordering of the lowest positive and negative parity resonances in the nucleon and the $\Lambda$ hyperon spectra. |
2305.01344 | Tong Li | Tong Li, Rui-Jia Zhang | Quantum calculation of axion-photon transition in electromagnetodynamics
for cavity haloscope | 18 pages, 2 figures. published version in Chin.Phys.C | null | null | null | hep-ph hep-ex | http://creativecommons.org/licenses/by/4.0/ | The Witten effect implies the presence of electric charge of magnetic monople
and possible relationship between axion and dyon. The axion-dyon dynamics can
be reliably built based on the quantum electromagnetodynamics (QEMD) which was
developed by Schwinger and Zwanziger in 1960's. A generic low-energy
axion-photon effective field theory can also be realized in the language of
``generalized symmetries'' with higher-form symmetries and background gauge
fields. In this work, we implement the quantum calculation of axion-single
photon transition rate inside a homogeneous electromagnetic field in terms of
the new axion interaction Hamiltonian in QEMD. This quantum calculation can
clearly imply the enhancement of conversion rate through resonant cavity in
axion haloscope experiments. We also show the promising potentials on the
cavity search of new axion-photon couplings in QEMD.
| [
{
"created": "Tue, 2 May 2023 11:46:04 GMT",
"version": "v1"
},
{
"created": "Mon, 20 Nov 2023 12:36:41 GMT",
"version": "v2"
}
] | 2023-11-21 | [
[
"Li",
"Tong",
""
],
[
"Zhang",
"Rui-Jia",
""
]
] | The Witten effect implies the presence of electric charge of magnetic monople and possible relationship between axion and dyon. The axion-dyon dynamics can be reliably built based on the quantum electromagnetodynamics (QEMD) which was developed by Schwinger and Zwanziger in 1960's. A generic low-energy axion-photon effective field theory can also be realized in the language of ``generalized symmetries'' with higher-form symmetries and background gauge fields. In this work, we implement the quantum calculation of axion-single photon transition rate inside a homogeneous electromagnetic field in terms of the new axion interaction Hamiltonian in QEMD. This quantum calculation can clearly imply the enhancement of conversion rate through resonant cavity in axion haloscope experiments. We also show the promising potentials on the cavity search of new axion-photon couplings in QEMD. |
1810.03172 | Ligong Bian | Ligong Bian and Yi-Lei Tang | Thermally modified sterile neutrino portal dark matter and gravitational
waves from phase transition: The Freeze-in case | 32 pages, 10 figures, comments welcome | null | 10.1007/JHEP12(2018)006 | null | hep-ph astro-ph.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We consider the thermal effects into the evaluation of the dark matter
production process. With the assistance of the right handed neutrinos, the
freeze-in massive particle dark matter production history can be modified by
the two-step phase transitions. The kinematic of decay/inverse decay or
annihilation processes can be affected by the finite temperature effects as the
Universe cools down. The history of the symmetry respected by the model can be
revealed by the DM relic abundance evolution processes. The strong first order
electroweak phase transition generated gravitational waves can be probed. The
number of extra scalars for the Hierarchy problem can be probed through the
Higgs off-shell searches at the LHC.
| [
{
"created": "Sun, 7 Oct 2018 16:13:15 GMT",
"version": "v1"
}
] | 2018-12-26 | [
[
"Bian",
"Ligong",
""
],
[
"Tang",
"Yi-Lei",
""
]
] | We consider the thermal effects into the evaluation of the dark matter production process. With the assistance of the right handed neutrinos, the freeze-in massive particle dark matter production history can be modified by the two-step phase transitions. The kinematic of decay/inverse decay or annihilation processes can be affected by the finite temperature effects as the Universe cools down. The history of the symmetry respected by the model can be revealed by the DM relic abundance evolution processes. The strong first order electroweak phase transition generated gravitational waves can be probed. The number of extra scalars for the Hierarchy problem can be probed through the Higgs off-shell searches at the LHC. |
hep-ph/0103043 | Robert Shrock | Shmuel Nussinov and Robert Shrock | On High-Energy Behavior of Cross Sections in Theories with Large Extra
Dimensions | 6 pages, latex | Phys.Rev. D64 (2001) 047702 | 10.1103/PhysRevD.64.047702 | null | hep-ph | null | We discuss the high-energy behavior of cross sections in theories with large
extra dimensions and low-scale quantum gravity, addressing two particular
issues: (i) the tension of the D-branes, and (ii) bounds on the cross section
and their relation to approximations in the mode sum over Kaluza-Klein-graviton
exchanges.
| [
{
"created": "Sun, 4 Mar 2001 19:45:02 GMT",
"version": "v1"
}
] | 2009-11-07 | [
[
"Nussinov",
"Shmuel",
""
],
[
"Shrock",
"Robert",
""
]
] | We discuss the high-energy behavior of cross sections in theories with large extra dimensions and low-scale quantum gravity, addressing two particular issues: (i) the tension of the D-branes, and (ii) bounds on the cross section and their relation to approximations in the mode sum over Kaluza-Klein-graviton exchanges. |
2301.07036 | V\'ictor Bres\'o-Pla | V\'ictor Bres\'o-Pla, Adam Falkowski, Mart\'in Gonz\'alez-Alonso,
Kevin Mons\'alvez-Pozo | EFT analysis of New Physics at COHERENT | 52 pages, 7 figures, 3 tables, typos corrected | null | 10.1007/JHEP05(2023)074 | null | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Using an effective field theory approach, we study coherent neutrino
scattering on nuclei, in the setup pertinent to the COHERENT experiment. We
include non-standard effects both in neutrino production and detection, with an
arbitrary flavor structure, with all leading Wilson coefficients simultaneously
present, and without assuming factorization in flux times cross section. A
concise description of the COHERENT event rate is obtained by introducing three
generalized weak charges, which can be associated (in a certain sense) to the
production and scattering of $\nu_e$, $\nu_\mu$ and $\bar{\nu}_\mu$ on the
nuclear target. Our results are presented in a convenient form that can be
trivially applied to specific New Physics scenarios. In particular, we find
that existing COHERENT measurements provide percent level constraints on two
combinations of Wilson coefficients. These constraints have a visible impact on
the global SMEFT fit, even in the constrained flavor-blind setup. The
improvement, which affects certain 4-fermion LLQQ operators, is significantly
more important in a flavor-general SMEFT. Our work shows that COHERENT data
should be included in electroweak precision studies from now on.
| [
{
"created": "Tue, 17 Jan 2023 17:35:05 GMT",
"version": "v1"
},
{
"created": "Mon, 20 Feb 2023 11:42:29 GMT",
"version": "v2"
},
{
"created": "Wed, 19 Jun 2024 06:36:58 GMT",
"version": "v3"
}
] | 2024-06-21 | [
[
"Bresó-Pla",
"Víctor",
""
],
[
"Falkowski",
"Adam",
""
],
[
"González-Alonso",
"Martín",
""
],
[
"Monsálvez-Pozo",
"Kevin",
""
]
] | Using an effective field theory approach, we study coherent neutrino scattering on nuclei, in the setup pertinent to the COHERENT experiment. We include non-standard effects both in neutrino production and detection, with an arbitrary flavor structure, with all leading Wilson coefficients simultaneously present, and without assuming factorization in flux times cross section. A concise description of the COHERENT event rate is obtained by introducing three generalized weak charges, which can be associated (in a certain sense) to the production and scattering of $\nu_e$, $\nu_\mu$ and $\bar{\nu}_\mu$ on the nuclear target. Our results are presented in a convenient form that can be trivially applied to specific New Physics scenarios. In particular, we find that existing COHERENT measurements provide percent level constraints on two combinations of Wilson coefficients. These constraints have a visible impact on the global SMEFT fit, even in the constrained flavor-blind setup. The improvement, which affects certain 4-fermion LLQQ operators, is significantly more important in a flavor-general SMEFT. Our work shows that COHERENT data should be included in electroweak precision studies from now on. |
0909.4652 | Cristian Pisano | Daniel Boer, Piet J. Mulders, Cristian Pisano | Dijet imbalance in hadronic collisions | 15 pages, 2 figures; revised version, published in Phys. Rev. D | Phys.Rev.D80:094017,2009 | 10.1103/PhysRevD.80.094017 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The imbalance of dijets produced in hadronic collisions has been used to
extract the average transverse momentum of partons inside the hadrons. In this
paper we discuss new contributions to the dijet imbalance that could complicate
or even hamper this extraction. They are due to polarization of initial state
partons inside unpolarized hadrons that can arise in the presence of nonzero
parton transverse momentum. Transversely polarized quarks and linearly
polarized gluons produce specific azimuthal dependences of the two jets that in
principle are not suppressed. Their effects cannot be isolated just by looking
at the angular deviation from the back-to-back situation, rather they enter jet
broadening observables. In this way they directly affect the extraction of the
average transverse momentum of unpolarized partons that is thought to be
extracted. We discuss appropriately weighted cross sections to isolate the
additional contributions.
| [
{
"created": "Fri, 25 Sep 2009 09:49:46 GMT",
"version": "v1"
},
{
"created": "Thu, 1 Oct 2009 10:54:33 GMT",
"version": "v2"
},
{
"created": "Tue, 24 Nov 2009 14:06:35 GMT",
"version": "v3"
}
] | 2009-12-15 | [
[
"Boer",
"Daniel",
""
],
[
"Mulders",
"Piet J.",
""
],
[
"Pisano",
"Cristian",
""
]
] | The imbalance of dijets produced in hadronic collisions has been used to extract the average transverse momentum of partons inside the hadrons. In this paper we discuss new contributions to the dijet imbalance that could complicate or even hamper this extraction. They are due to polarization of initial state partons inside unpolarized hadrons that can arise in the presence of nonzero parton transverse momentum. Transversely polarized quarks and linearly polarized gluons produce specific azimuthal dependences of the two jets that in principle are not suppressed. Their effects cannot be isolated just by looking at the angular deviation from the back-to-back situation, rather they enter jet broadening observables. In this way they directly affect the extraction of the average transverse momentum of unpolarized partons that is thought to be extracted. We discuss appropriately weighted cross sections to isolate the additional contributions. |
hep-ph/9810279 | Michal Brhlik | Michal Brhlik | SUSY Dark Matter: Direct Searches vs. Collider Experiments | Invited talk at Second International Conference on Dark Matter in
Astrophysics and Particle Physics (DARK-98), Heidelberg, Germany, July 20-25,
1998; 17 pages, 6 figures (latex, psfig, epsf) | null | null | null | hep-ph | null | The lightest neutralino in supersymmetric models with conserved R-parity is
an attractive candidate for non-luminous matter in the universe. If relic
neutralinos are indeed present as dark matter in our galaxy, they can be
directly detected in scattering experiments. This could serve as an independent
search channel for supersymmetry complementary to collider experiments. I
compare the sensitivity of direct detection experiments with the reach for
supersymmetry at collider facilities in the framework of the minimal
supergravity model.
| [
{
"created": "Wed, 7 Oct 1998 17:42:01 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Brhlik",
"Michal",
""
]
] | The lightest neutralino in supersymmetric models with conserved R-parity is an attractive candidate for non-luminous matter in the universe. If relic neutralinos are indeed present as dark matter in our galaxy, they can be directly detected in scattering experiments. This could serve as an independent search channel for supersymmetry complementary to collider experiments. I compare the sensitivity of direct detection experiments with the reach for supersymmetry at collider facilities in the framework of the minimal supergravity model. |
hep-ph/0504166 | Serguey Petcov | S. T. Petcov | Theoretical Prospects of Neutrinoless Double Beta Decay | 15 pages, 2 postscript figures, LATEX; Invited talk given at the
Nobel Symposium (N 129) on Neutrino Physics, August 19 - 24, 2004, Haga
Slott, Enkoping, Sweden | Phys.Scripta T121 (2005) 94-101 | 10.1088/0031-8949/2005/T121/013 | SISSA 13/2005/EP | hep-ph | null | The compelling experimental evidences for oscillations of solar and
atmospheric neutrinos imply the existence of 3-neutrino mixing in vacuum. We
briefly review the phenomenology of 3-neutrino mixing, and the current data on
the 3-neutrino mixing parameters. The open questions and the main goals of
future research in the field of neutrino mixing and oscillations are outlined.
The predictions for the effective Majorana mass |<m>| in neutrinoless double
beta (bb0nu-) decay in the case of 3-neutrino mixing and massive Majorana
neutrinos are reviewed. The physics potential of the experiments, searching for
bb0nu-decay and having sensitivity approximately 10 times better than the
presently reached, for providing information on the type of the neutrino mass
spectrum, on the absolute scale of neutrino masses and on the Majorana
CP-violation phases in the PMNS neutrino mixing matrix, is discussed.
| [
{
"created": "Tue, 19 Apr 2005 13:53:50 GMT",
"version": "v1"
}
] | 2009-11-11 | [
[
"Petcov",
"S. T.",
""
]
] | The compelling experimental evidences for oscillations of solar and atmospheric neutrinos imply the existence of 3-neutrino mixing in vacuum. We briefly review the phenomenology of 3-neutrino mixing, and the current data on the 3-neutrino mixing parameters. The open questions and the main goals of future research in the field of neutrino mixing and oscillations are outlined. The predictions for the effective Majorana mass |<m>| in neutrinoless double beta (bb0nu-) decay in the case of 3-neutrino mixing and massive Majorana neutrinos are reviewed. The physics potential of the experiments, searching for bb0nu-decay and having sensitivity approximately 10 times better than the presently reached, for providing information on the type of the neutrino mass spectrum, on the absolute scale of neutrino masses and on the Majorana CP-violation phases in the PMNS neutrino mixing matrix, is discussed. |
hep-ph/9809451 | Mike Seymour | Gennaro Corcella (Milano) and Michael H. Seymour (RAL) | Matrix Element Corrections to Parton Shower Simulations of Heavy Quark
Decay | 12 pages, 7 postscript figures | Phys.Lett. B442 (1998) 417-426 | 10.1016/S0370-2693(98)01251-9 | IFUM-633-FT and RAL-TR-1998-067 | hep-ph | null | Parton showers are accurate for soft and/or collinear emission, but for a
good description of the whole of phase space they need to be supplemented by
matrix element corrections. In this paper, we discuss matrix element
corrections to the decay t->Wb and apply our results to the HERWIG Monte Carlo
event generator. The phenomenological results show marked improvement relative
to previous versions and agree well with the exact first-order matrix-element
calculation.
| [
{
"created": "Fri, 18 Sep 1998 14:50:34 GMT",
"version": "v1"
}
] | 2009-10-31 | [
[
"Corcella",
"Gennaro",
"",
"Milano"
],
[
"Seymour",
"Michael H.",
"",
"RAL"
]
] | Parton showers are accurate for soft and/or collinear emission, but for a good description of the whole of phase space they need to be supplemented by matrix element corrections. In this paper, we discuss matrix element corrections to the decay t->Wb and apply our results to the HERWIG Monte Carlo event generator. The phenomenological results show marked improvement relative to previous versions and agree well with the exact first-order matrix-element calculation. |
0912.2259 | Wayne W. Repko | Stanley F. Radford and Wayne W. Repko | Hyperfine splittings in the $b\bar{b}$ system | 5 pages, 3 tables, text revisions | Nucl.Phys.A865:69-75,2011 | 10.1016/j.nuclphysa.2011.06.032 | NSF-KITP-09-189 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Recent measurements of the $\eta_b(1S)$, the ground state of the $b\bar{b}$
system, show the splitting between it and the $\Up(1S)$ to be 69.5$\pm$3.2 MeV,
considerably larger than lattice QCD and potential model predictions, including
recent calculations published by us. The models are unable to incorporate such
a large hyperfine splitting within the context of a consistent description of
the energy spectrum and decays. We demonstrate that in our model, which
incorporates a relativistic kinetic energy term, a linear confining term
including its scalar-exchange relativistic corrections, and the complete
one-loop QCD short distance potential, such a consistent description, including
the measured hyperfine splitting, can be obtained by not softening the delta
function terms in the hyperfine potential. We calculate the hyperfine splitting
to be 67.5 MeV.
| [
{
"created": "Fri, 11 Dec 2009 15:46:26 GMT",
"version": "v1"
},
{
"created": "Sun, 10 Jan 2010 18:09:22 GMT",
"version": "v2"
},
{
"created": "Wed, 9 Jun 2010 18:00:11 GMT",
"version": "v3"
},
{
"created": "Fri, 7 Jan 2011 19:31:57 GMT",
"version": "v4"
}
] | 2011-08-09 | [
[
"Radford",
"Stanley F.",
""
],
[
"Repko",
"Wayne W.",
""
]
] | Recent measurements of the $\eta_b(1S)$, the ground state of the $b\bar{b}$ system, show the splitting between it and the $\Up(1S)$ to be 69.5$\pm$3.2 MeV, considerably larger than lattice QCD and potential model predictions, including recent calculations published by us. The models are unable to incorporate such a large hyperfine splitting within the context of a consistent description of the energy spectrum and decays. We demonstrate that in our model, which incorporates a relativistic kinetic energy term, a linear confining term including its scalar-exchange relativistic corrections, and the complete one-loop QCD short distance potential, such a consistent description, including the measured hyperfine splitting, can be obtained by not softening the delta function terms in the hyperfine potential. We calculate the hyperfine splitting to be 67.5 MeV. |
hep-ph/9910308 | Jan Kalinowski | Wojciech Krolikowski | Option of three pseudo--Dirac neutrinos | LaTeX, 10 pages | Acta Phys.Polon. B31 (2000) 663-672 | null | IFT/99-24 | hep-ph | null | As an alternative for popular see-saw mechanism, the option of three pseudo%
-Dirac neutrinos is discussed, where ${1/2}(m^{(L)} + m^{(R)}) \ll m^{(D)}$ for
their Majorana and Dirac masses. The actual neutrino mass matrix is assumed in
the form of tensor product $ M^{(\nu)} \otimes {(\{array} {cc} \lambda^{(L)} &
1 1 & \lambda^{(R)} \{array})}$, where $ M^{(\nu)}$ is a neutrino family mass
matrix ($ M^{(\nu) \dagger} = M^{(\nu)}$) and $\lambda^{(L,R)} \equiv
m^{(L,R)}/m^{(D)}$ with $ m^{(L)}$, $ m^{(R)}$ and $ m^{(D)} $ being taken as
universal for three neutrino families. It is shown that three neutrino effects
(deficits of solar $\nu_e $'s and atmospheric $ \nu_\mu $'s as well as the
possible LSND excess of $\nu_e $'s in accelerator $\nu_\mu $ beam) can be
nicely described by the corresponding neutrino oscillations, though the LSND
effect may, alternatively, be eliminated (by a parameter choice). Atmospheric
$\nu_\mu $'s oscillate dominantly into $\nu_\tau $'s, while solar $\nu_e $'s -
into (existing here automatically) Majorana sterile counterparts of $\nu_e $'s.
A phenomenological texture for neutrinos, compatible with the proposed
description, is briefly presented.
| [
{
"created": "Tue, 12 Oct 1999 08:50:05 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Krolikowski",
"Wojciech",
""
]
] | As an alternative for popular see-saw mechanism, the option of three pseudo% -Dirac neutrinos is discussed, where ${1/2}(m^{(L)} + m^{(R)}) \ll m^{(D)}$ for their Majorana and Dirac masses. The actual neutrino mass matrix is assumed in the form of tensor product $ M^{(\nu)} \otimes {(\{array} {cc} \lambda^{(L)} & 1 1 & \lambda^{(R)} \{array})}$, where $ M^{(\nu)}$ is a neutrino family mass matrix ($ M^{(\nu) \dagger} = M^{(\nu)}$) and $\lambda^{(L,R)} \equiv m^{(L,R)}/m^{(D)}$ with $ m^{(L)}$, $ m^{(R)}$ and $ m^{(D)} $ being taken as universal for three neutrino families. It is shown that three neutrino effects (deficits of solar $\nu_e $'s and atmospheric $ \nu_\mu $'s as well as the possible LSND excess of $\nu_e $'s in accelerator $\nu_\mu $ beam) can be nicely described by the corresponding neutrino oscillations, though the LSND effect may, alternatively, be eliminated (by a parameter choice). Atmospheric $\nu_\mu $'s oscillate dominantly into $\nu_\tau $'s, while solar $\nu_e $'s - into (existing here automatically) Majorana sterile counterparts of $\nu_e $'s. A phenomenological texture for neutrinos, compatible with the proposed description, is briefly presented. |
1309.5041 | George Rupp | Michael D. Scadron, George Rupp, and Robert Delbourgo | The Quark-Level Linear \sigma\ Model | Review, 34 pages, 14 figures with 24 graphs, 1 table, version
accepted for publication in Fortschritte der Physik; v2: typos and 3
references corrected, Ref. [175] updated | Fortschritte der Physik 61 (2013) 994-1027 | 10.1002/prop.201300022 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | This review of the quark-level linear \sigma model is based upon the
dynamical realization of the pseudoscalar and scalar mesons as a linear
representation of SU(2) x SU(2) chiral symmetry, with the symmetry weakly
broken by current quark masses. In its simplest SU(2) incarnation, with two
non-strange quark flavors and three colors, this nonperturbative theory, which
can be selfconsistently bootstrapped in loop order, is shown to accurately
reproduce a host of low-energy observables with only one parameter, namely the
pion decay constant f_\pi. Extending the scheme to SU(3) by including the
strange quark, equally good results are obtained for many strong,
electromagnetic, and weak processes just with two extra constants, viz. f_K and
$\langle\pi|H_{\mbox{\scriptsize weak}}|K\rangle$. Links are made with the
vector-meson-dominance model, the BCS theory of superconductivity, and
chiral-symmetry restoration at high temperature. Finally, these ideas are
cautiously generalized to the electroweak sector, including the W, Z, and Higgs
bosons, and also to CP violation.
| [
{
"created": "Thu, 19 Sep 2013 16:26:26 GMT",
"version": "v1"
},
{
"created": "Thu, 24 Oct 2013 18:13:19 GMT",
"version": "v2"
}
] | 2013-10-25 | [
[
"Scadron",
"Michael D.",
""
],
[
"Rupp",
"George",
""
],
[
"Delbourgo",
"Robert",
""
]
] | This review of the quark-level linear \sigma model is based upon the dynamical realization of the pseudoscalar and scalar mesons as a linear representation of SU(2) x SU(2) chiral symmetry, with the symmetry weakly broken by current quark masses. In its simplest SU(2) incarnation, with two non-strange quark flavors and three colors, this nonperturbative theory, which can be selfconsistently bootstrapped in loop order, is shown to accurately reproduce a host of low-energy observables with only one parameter, namely the pion decay constant f_\pi. Extending the scheme to SU(3) by including the strange quark, equally good results are obtained for many strong, electromagnetic, and weak processes just with two extra constants, viz. f_K and $\langle\pi|H_{\mbox{\scriptsize weak}}|K\rangle$. Links are made with the vector-meson-dominance model, the BCS theory of superconductivity, and chiral-symmetry restoration at high temperature. Finally, these ideas are cautiously generalized to the electroweak sector, including the W, Z, and Higgs bosons, and also to CP violation. |
1008.0254 | Miguel Angel Escobedo Espinosa | Miguel Angel Escobedo and Joan Soto | Non-relativistic bound states at finite temperature (II): the muonic
hydrogen | 22 pages, 8 figures. Journal version, reference added | Phys.Rev.A82:042506,2010 | 10.1103/PhysRevA.82.042506 | UB-ECM-PF 09/15, ICCUB-10-105 | hep-ph nucl-th physics.atom-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We illustrate how to apply modern effective field theory techniques and
dimensional regularization to factorise the various scales which appear in QED
bound states at finite temperature. We focus here on the muonic hydrogen atom.
Vacuum polarization effects make the physics of this atom at finite temperature
very close to that of heavy quarkonium states. We comment on the implications
of our results for these states in the quark gluon plasma. In particular, we
estimate the effects of a finite charm quark mass in the dissociation
temperature of bottomonium.
| [
{
"created": "Mon, 2 Aug 2010 09:11:46 GMT",
"version": "v1"
},
{
"created": "Mon, 8 Nov 2010 16:07:35 GMT",
"version": "v2"
}
] | 2010-11-11 | [
[
"Escobedo",
"Miguel Angel",
""
],
[
"Soto",
"Joan",
""
]
] | We illustrate how to apply modern effective field theory techniques and dimensional regularization to factorise the various scales which appear in QED bound states at finite temperature. We focus here on the muonic hydrogen atom. Vacuum polarization effects make the physics of this atom at finite temperature very close to that of heavy quarkonium states. We comment on the implications of our results for these states in the quark gluon plasma. In particular, we estimate the effects of a finite charm quark mass in the dissociation temperature of bottomonium. |
1912.08553 | Mawande Lushozi | Mawande Lushozi, Larry D. McLerran, Micha{\l} Praszalowicz and
Gongming Yu | Gluon Bremsstrahlung in Relativistic Heavy Ion Collisions | 5 pages, 2 figures Clarifying paragraphs added to Introduction and
Section II | Phys. Rev. C 102, 034908 (2020) | 10.1103/PhysRevC.102.034908 | INT-PUB-20-036 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the process $qq\rightarrow qqg$ at lowest order in QCD perturbation
theory to understand gluon radiation in the fragmentation region of
relativistic heavy-ion collisions. We arrive at a formula for gluon
multiplicity that interpolates between $\sim 1/k_{\bot}^2$ behavior at low
$k_{\bot}$, to $\sim 1/k_{\bot}^4$ at large $k_{\bot}$.
| [
{
"created": "Wed, 18 Dec 2019 12:12:33 GMT",
"version": "v1"
},
{
"created": "Mon, 23 Dec 2019 20:10:59 GMT",
"version": "v2"
},
{
"created": "Wed, 24 Jun 2020 22:36:35 GMT",
"version": "v3"
}
] | 2020-09-30 | [
[
"Lushozi",
"Mawande",
""
],
[
"McLerran",
"Larry D.",
""
],
[
"Praszalowicz",
"Michał",
""
],
[
"Yu",
"Gongming",
""
]
] | We study the process $qq\rightarrow qqg$ at lowest order in QCD perturbation theory to understand gluon radiation in the fragmentation region of relativistic heavy-ion collisions. We arrive at a formula for gluon multiplicity that interpolates between $\sim 1/k_{\bot}^2$ behavior at low $k_{\bot}$, to $\sim 1/k_{\bot}^4$ at large $k_{\bot}$. |
1612.08316 | Shun Zhou | Shun Zhou | Overview on Neutrino Theory and Phenomenology | 6 pages, no figures, invited talk at the International Workshop on
Tau Lepton Physics, IHEP, Beijing, September 19-23, 2016 | null | null | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this talk, I give an overview on recent theoretical and phenomenological
studies of massive neutrinos. First of all, the present status of neutrino
mixing parameters is summarized. The phenomenology of neutrino oscillations is
then discussed, and current understanding of lepton flavor mixing is presented.
Finally, I consider the seesaw models of neutrino masses and briefly mention
the direct searches at the CERN Large Hadron Collider (LHC).
| [
{
"created": "Mon, 26 Dec 2016 03:27:55 GMT",
"version": "v1"
}
] | 2016-12-28 | [
[
"Zhou",
"Shun",
""
]
] | In this talk, I give an overview on recent theoretical and phenomenological studies of massive neutrinos. First of all, the present status of neutrino mixing parameters is summarized. The phenomenology of neutrino oscillations is then discussed, and current understanding of lepton flavor mixing is presented. Finally, I consider the seesaw models of neutrino masses and briefly mention the direct searches at the CERN Large Hadron Collider (LHC). |
hep-ph/9908429 | M. Sugiura | N. Haba (Mie Univ.), Y. Matsui (Nagoya Univ.), N. Okamura (KEK) and M.
Sugiura (Nagoya Univ.) | The effect of Majorana phase in degenerate neutrinos | 7 pages, 1 figures, LaTeX | Prog.Theor.Phys. 103 (2000) 145-150 | 10.1143/PTP.103.145 | DPNU-99-25, KEK-TH-636 | hep-ph | null | There are physical Majorana phases in the lepton flavor mixing matrix when
neutrinos are Majorana fermions. In the case of two degenerate neutrinos, the
physical Majorana phase plays the crucial role for the stability of the maximal
flavor mixing between the second and the third generations against quantum
corrections. The physical Majorana phase of $\pi$ guarantees the maximal mixing
to be stable against quantum corrections, while the Majorana phase of zero lets
the maximal mixing be spoiled by quantum corrections when neutrino masses are
of O(eV). The continuous change of the Majorana phase from $\pi$ to 0 makes the
maximal mixing be spoiled by quantum corrections with O(eV) degenerate neutrino
masses. On the other hand, when there is the large mass hierarchy between
neutrinos, the maximal flavor mixing is not spoiled by quantum corrections
independently of the Majorana phase.
| [
{
"created": "Sat, 21 Aug 1999 11:43:33 GMT",
"version": "v1"
}
] | 2009-10-31 | [
[
"Haba",
"N.",
"",
"Mie Univ."
],
[
"Matsui",
"Y.",
"",
"Nagoya Univ."
],
[
"Okamura",
"N.",
"",
"KEK"
],
[
"Sugiura",
"M.",
"",
"Nagoya Univ."
]
] | There are physical Majorana phases in the lepton flavor mixing matrix when neutrinos are Majorana fermions. In the case of two degenerate neutrinos, the physical Majorana phase plays the crucial role for the stability of the maximal flavor mixing between the second and the third generations against quantum corrections. The physical Majorana phase of $\pi$ guarantees the maximal mixing to be stable against quantum corrections, while the Majorana phase of zero lets the maximal mixing be spoiled by quantum corrections when neutrino masses are of O(eV). The continuous change of the Majorana phase from $\pi$ to 0 makes the maximal mixing be spoiled by quantum corrections with O(eV) degenerate neutrino masses. On the other hand, when there is the large mass hierarchy between neutrinos, the maximal flavor mixing is not spoiled by quantum corrections independently of the Majorana phase. |
2110.02773 | Tousik Samui | Atri Dey, and Tousik Samui | Jet Substructure and Multivariate Analysis Aid in Polarization Study of
Boosted, Hadronic $W$ Fatjet at the LHC | 20 pages, 5 figures, 3 tables | null | null | HRI-RECAPP-2021-011 | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Study of polarization of heavy particles is an important branch of research
in today's collider studies. The massive $W$ boson has two types of
polarization states, which usually are studied via the angular distribution of
its decay products. We have studied polarization of hadronic and boosted $W$
boson using jet substructure technique at 14 TeV LHC. Two different methods,
viz. N-subjettiness and Soft Drop, were used to find the subjets, which are
approximately considered to be the two hadronic decay products of $W$, inside
boosted $W$ jets. These subjets were then used to find the distribution of
$p_\theta$ and $z_j$ to prepare the templates of longitudinally and
transversely polarized $W$. We then used these templates to find the fractions
of different $W$ polarization in a mixed sample to a relatively good accuracy.
| [
{
"created": "Wed, 6 Oct 2021 13:49:34 GMT",
"version": "v1"
},
{
"created": "Fri, 29 Oct 2021 14:44:24 GMT",
"version": "v2"
}
] | 2021-11-01 | [
[
"Dey",
"Atri",
""
],
[
"Samui",
"Tousik",
""
]
] | Study of polarization of heavy particles is an important branch of research in today's collider studies. The massive $W$ boson has two types of polarization states, which usually are studied via the angular distribution of its decay products. We have studied polarization of hadronic and boosted $W$ boson using jet substructure technique at 14 TeV LHC. Two different methods, viz. N-subjettiness and Soft Drop, were used to find the subjets, which are approximately considered to be the two hadronic decay products of $W$, inside boosted $W$ jets. These subjets were then used to find the distribution of $p_\theta$ and $z_j$ to prepare the templates of longitudinally and transversely polarized $W$. We then used these templates to find the fractions of different $W$ polarization in a mixed sample to a relatively good accuracy. |
hep-ph/0702164 | Xuelei Wang | Xuelei Wang, Suzhen Liu, Qingguo Zeng, Zhenlan Jin | Probing the lightest new gauge boson $B_H$ in the littlest Higgs model
via the processes $\gamma\gamma \to f\bar{f}B_H$ at the ILC | 12 pages, 4 figures | Commun.Theor.Phys.49:421-427,2008 | 10.1088/0253-6102/49/2/36 | null | hep-ph | null | The neutral gauge boson $B_H$ with the mass of hundreds GeV, is the lightest
particle predicted by the littlest Higgs(LH) model, and such particle should be
the first signal of the LH model at the planed ILC if it exists indeed. In this
paper, we study some processes of the $B_H$ production associated with the
fermion pair at the ILC, i.e., $\gamma\gamma\to f\bar{f}B_{H}$. The studies
show that the most promising processes to detect $B_H$ among $\gamma\gamma\to
f\bar{f}B_{H}$ are $\gamma\gamma\to l'^+l'^-B_{H}(l'=e,\mu)$, and they can
produce the sufficient signals in most parameter space preferred by the
electroweak precision data at the ILC. On the other hand, the signal produced
via the certain $B_H$ decay modes is typical and such signal can be easily
identified from the SM background. Therefore, $B_H$, the lightest gauge boson
in the LH model would be detectable at the photon collider realized at the ILC.
| [
{
"created": "Fri, 16 Feb 2007 11:07:39 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Wang",
"Xuelei",
""
],
[
"Liu",
"Suzhen",
""
],
[
"Zeng",
"Qingguo",
""
],
[
"Jin",
"Zhenlan",
""
]
] | The neutral gauge boson $B_H$ with the mass of hundreds GeV, is the lightest particle predicted by the littlest Higgs(LH) model, and such particle should be the first signal of the LH model at the planed ILC if it exists indeed. In this paper, we study some processes of the $B_H$ production associated with the fermion pair at the ILC, i.e., $\gamma\gamma\to f\bar{f}B_{H}$. The studies show that the most promising processes to detect $B_H$ among $\gamma\gamma\to f\bar{f}B_{H}$ are $\gamma\gamma\to l'^+l'^-B_{H}(l'=e,\mu)$, and they can produce the sufficient signals in most parameter space preferred by the electroweak precision data at the ILC. On the other hand, the signal produced via the certain $B_H$ decay modes is typical and such signal can be easily identified from the SM background. Therefore, $B_H$, the lightest gauge boson in the LH model would be detectable at the photon collider realized at the ILC. |
1811.08418 | Andrea Mitridate | Christian Gross, Andrea Mitridate, Michele Redi, Juri Smirnov,
Alessandro Strumia | Cosmological Abundance of Colored Relics | 24 pages, 7 figures | Phys. Rev. D 99, 016024 (2019) | 10.1103/PhysRevD.99.016024 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The relic cosmological abundance of stable or long-lived neutral colored
particles gets reduced by about a few orders of magnitude by annihilations that
occur after QCD confinement. We compute the abundance and the cosmological
bounds on relic gluinos. The same post-confinement effect strongly enhances
co-annihilations with a lighter Dark Matter particle, provided that their mass
difference is below a few GeV. Charged colored particles (such as stops) can
instead form baryons, which can be (quasi)stable in some models.
| [
{
"created": "Tue, 20 Nov 2018 18:50:30 GMT",
"version": "v1"
}
] | 2019-02-06 | [
[
"Gross",
"Christian",
""
],
[
"Mitridate",
"Andrea",
""
],
[
"Redi",
"Michele",
""
],
[
"Smirnov",
"Juri",
""
],
[
"Strumia",
"Alessandro",
""
]
] | The relic cosmological abundance of stable or long-lived neutral colored particles gets reduced by about a few orders of magnitude by annihilations that occur after QCD confinement. We compute the abundance and the cosmological bounds on relic gluinos. The same post-confinement effect strongly enhances co-annihilations with a lighter Dark Matter particle, provided that their mass difference is below a few GeV. Charged colored particles (such as stops) can instead form baryons, which can be (quasi)stable in some models. |
2005.03808 | Alejandro Gutierrez-Rodriguez | A. Llamas-Bugarin, A. Gutierrez-Rodriguez, A. Gonzalez-Sanchez, M. A.
Hernandez-Ruiz, A. Espinoza-Garrido and A. Chubikalo | Stellar energy loss rates beyond the standard model | 28 pages, 11 figures | null | null | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | It is known that the dipole moments of the neutrino lead to important
astrophysical and cosmological effects. In this regard, within the context of a
$U(1)_{B-L}$ model, we develop and present novel analytical formulas to assess
the effects of the anomalous magnetic moment and electric dipole moment of the
neutrino on the stellar energy loss rates through some common physical process
of pair-annihilation $e^+e^-\to(\gamma, Z, Z^{\prime})\to\nu\bar\nu$. Our
results show that the stellar energy loss rates strongly depends on the
effective magnetic moment of the neutrino, but also on the parameters which
characterize the adopted $U(1)_{B-L}$ model.
| [
{
"created": "Fri, 8 May 2020 01:01:46 GMT",
"version": "v1"
}
] | 2020-05-11 | [
[
"Llamas-Bugarin",
"A.",
""
],
[
"Gutierrez-Rodriguez",
"A.",
""
],
[
"Gonzalez-Sanchez",
"A.",
""
],
[
"Hernandez-Ruiz",
"M. A.",
""
],
[
"Espinoza-Garrido",
"A.",
""
],
[
"Chubikalo",
"A.",
""
]
] | It is known that the dipole moments of the neutrino lead to important astrophysical and cosmological effects. In this regard, within the context of a $U(1)_{B-L}$ model, we develop and present novel analytical formulas to assess the effects of the anomalous magnetic moment and electric dipole moment of the neutrino on the stellar energy loss rates through some common physical process of pair-annihilation $e^+e^-\to(\gamma, Z, Z^{\prime})\to\nu\bar\nu$. Our results show that the stellar energy loss rates strongly depends on the effective magnetic moment of the neutrino, but also on the parameters which characterize the adopted $U(1)_{B-L}$ model. |
1201.2672 | Gouranga Nayak | Gouranga C. Nayak | General Form of Color Charge of the Quark | 52 pages latex, final version, accepted for publication in Eur. Phys.
J. C. arXiv admin note: substantial text overlap with arXiv:1201.2666 | Eur. Phys. J. C (2013) 73:2442 | 10.1140/epjc/s10052-013-2442-6 | null | hep-ph hep-lat nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In Maxwell theory the constant electric charge e of the electron is
consistent with the continuity equation $\partial_\mu j^\mu(x)=0$ where
$j^\mu(x)$ is the current density of the electron where the repeated indices
$\mu=0,1,2,3$ are summed. However, in Yang-Mills theory the Yang-Mills color
current density $j^{\mu a}(x)$ of the quark satisfies the equation
$D_\mu[A]j^{\mu a}(x)=0$ which is not a continuity equation ($\partial_\mu
j^{\mu a}(x)\neq 0$) which implies that the color charge of the quark is not
constant where a=1,2,...,8 are the color indices. Since the charge of a point
particle is obtained from the zero ($\mu =0$) component of a corresponding
current density by integrating over the entire (physically) allowed volume, the
color charge $q^a(t)$ of the quark in Yang-Mills theory is time dependent. In
this paper we derive the general form of eight time dependent fundamental color
charges $q^a(t)$ of the quark in Yang-Mills theory in SU(3) where a=1,2,...,8.
| [
{
"created": "Thu, 12 Jan 2012 20:53:53 GMT",
"version": "v1"
},
{
"created": "Tue, 14 May 2013 19:18:43 GMT",
"version": "v2"
}
] | 2013-06-06 | [
[
"Nayak",
"Gouranga C.",
""
]
] | In Maxwell theory the constant electric charge e of the electron is consistent with the continuity equation $\partial_\mu j^\mu(x)=0$ where $j^\mu(x)$ is the current density of the electron where the repeated indices $\mu=0,1,2,3$ are summed. However, in Yang-Mills theory the Yang-Mills color current density $j^{\mu a}(x)$ of the quark satisfies the equation $D_\mu[A]j^{\mu a}(x)=0$ which is not a continuity equation ($\partial_\mu j^{\mu a}(x)\neq 0$) which implies that the color charge of the quark is not constant where a=1,2,...,8 are the color indices. Since the charge of a point particle is obtained from the zero ($\mu =0$) component of a corresponding current density by integrating over the entire (physically) allowed volume, the color charge $q^a(t)$ of the quark in Yang-Mills theory is time dependent. In this paper we derive the general form of eight time dependent fundamental color charges $q^a(t)$ of the quark in Yang-Mills theory in SU(3) where a=1,2,...,8. |
1707.08612 | Michal Malinsk\'y | Paolo Castorina, Alfredo Iorio, Michal Malinsk\'y | Effects of ultra-light dark matter on the gravitational quantum well | 6 pages, 2 figures | null | 10.1142/S0218271818500980 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the influence of a periodic perturbation of the effective masses of
the nucleons, due to the assumed semi-classical ultra-light dark matter
background, on the motion of neutrons in a gravitational quantum well. Our
focus is on the transition probability between the lowest two energy states,
with the Rabi frequency in the kHz region corresponding to the series of "sweet
spot" dark matter masses in the $10^{-11}$eV ballpark. The relevant probability
is written in terms of the specific mass and of the effective coupling to the
ordinary matter. These parameters can be constrained by the non-observation of
any significant deviations of the measured transition probabilities from the
dark-matter-free picture.
| [
{
"created": "Wed, 26 Jul 2017 19:04:50 GMT",
"version": "v1"
}
] | 2018-07-25 | [
[
"Castorina",
"Paolo",
""
],
[
"Iorio",
"Alfredo",
""
],
[
"Malinský",
"Michal",
""
]
] | We study the influence of a periodic perturbation of the effective masses of the nucleons, due to the assumed semi-classical ultra-light dark matter background, on the motion of neutrons in a gravitational quantum well. Our focus is on the transition probability between the lowest two energy states, with the Rabi frequency in the kHz region corresponding to the series of "sweet spot" dark matter masses in the $10^{-11}$eV ballpark. The relevant probability is written in terms of the specific mass and of the effective coupling to the ordinary matter. These parameters can be constrained by the non-observation of any significant deviations of the measured transition probabilities from the dark-matter-free picture. |
2010.05481 | Heikki M\"antysaari | Heikki M\"antysaari (for the LHeC and FCC-he Study Group) | Electron-Ion Collisions at the LHeC and FCC-he | 6 pages, 5 figures. Contribution to the Proceedings of the 40th
International Conference on High Energy physics ICHEP2020 | null | null | null | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The LHeC and the FCC-he will open a new realm in our understanding of nuclear
structure and the dynamics in processes involving nuclei, in an unexplored
kinematic domain. We review some of the recent studies as shown in the update
of the 2012 LHeC CDR, including the determination of nuclear parton densities
in the framework of global fits and for a single nucleus, inclusive and
exclusive diffraction and the unique capabilies of these high-energy colliders
for probing QCD in the non-linear regime of phase space.
| [
{
"created": "Mon, 12 Oct 2020 06:56:03 GMT",
"version": "v1"
}
] | 2020-10-13 | [
[
"Mäntysaari",
"Heikki",
"",
"for the LHeC and FCC-he Study Group"
]
] | The LHeC and the FCC-he will open a new realm in our understanding of nuclear structure and the dynamics in processes involving nuclei, in an unexplored kinematic domain. We review some of the recent studies as shown in the update of the 2012 LHeC CDR, including the determination of nuclear parton densities in the framework of global fits and for a single nucleus, inclusive and exclusive diffraction and the unique capabilies of these high-energy colliders for probing QCD in the non-linear regime of phase space. |
1207.2756 | P. S. Bhupal Dev | P. S. Bhupal Dev, Roberto Franceschini and R. N. Mohapatra | Bounds on TeV Seesaw Models from LHC Higgs Data | 24 pages, 3 figures, 8 tables; version accepted for publication in
PRD | null | 10.1103/PhysRevD.86.093010 | UMD-PP-012-012 | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We derive bounds on the Dirac Yukawa couplings of the neutrinos in seesaw
models using the recent Large Hadron Collider (LHC) data on Higgs decays for
the case where the Standard Model singlet heavy leptons needed for the seesaw
mechanism have masses in the 100 GeV range. Such scenarios with large Yukawa
couplings are natural in Inverse Seesaw models since the small neutrino mass
owes its origin to a small Majorana mass of a new set of singlet fermions.
Large Yukawas with sub-TeV mass right-handed neutrinos are also possible for
certain textures in Type-I seesaw models, so that the above bounds also apply
to them. We find that the current Higgs data from the LHC can put bounds on
both electron- and muon-type Yukawa couplings of order 10^{-2}.
| [
{
"created": "Wed, 11 Jul 2012 19:50:54 GMT",
"version": "v1"
},
{
"created": "Fri, 19 Oct 2012 22:21:04 GMT",
"version": "v2"
}
] | 2015-03-20 | [
[
"Dev",
"P. S. Bhupal",
""
],
[
"Franceschini",
"Roberto",
""
],
[
"Mohapatra",
"R. N.",
""
]
] | We derive bounds on the Dirac Yukawa couplings of the neutrinos in seesaw models using the recent Large Hadron Collider (LHC) data on Higgs decays for the case where the Standard Model singlet heavy leptons needed for the seesaw mechanism have masses in the 100 GeV range. Such scenarios with large Yukawa couplings are natural in Inverse Seesaw models since the small neutrino mass owes its origin to a small Majorana mass of a new set of singlet fermions. Large Yukawas with sub-TeV mass right-handed neutrinos are also possible for certain textures in Type-I seesaw models, so that the above bounds also apply to them. We find that the current Higgs data from the LHC can put bounds on both electron- and muon-type Yukawa couplings of order 10^{-2}. |
hep-ph/0703310 | Debasish Majumdar | Debasish Majumdar | Dark Matter -- Possible Candidates and Direct Detection | 18 pages, no figures. Talk given in Workshop on Physics and
Astrophysics of Hadrons and Hadronic Matter, Visva Bharati University,
Santiniketan, India, November, 2006 | null | null | null | hep-ph | null | The cosmological observations coupled with theoretical calculations suggest
the existence of enormous amount of unseen and unknown matter or dark matter in
the universe. The evidence of their existence, the possible candidates and
their possible direct detections are discussed.
| [
{
"created": "Thu, 29 Mar 2007 14:22:08 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Majumdar",
"Debasish",
""
]
] | The cosmological observations coupled with theoretical calculations suggest the existence of enormous amount of unseen and unknown matter or dark matter in the universe. The evidence of their existence, the possible candidates and their possible direct detections are discussed. |
1211.7290 | Marco Serone | Francesco Caracciolo, Alberto Parolini and Marco Serone | UV Completions of Composite Higgs Models with Partial Compositeness | 28 pages; v2: one reference added, several minor improvements,
version to appear in JHEP | null | 10.1007/JHEP02(2013)066 | SISSA-32/2012/EP | hep-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We construct UV completions of bottom-up models with a pseudo Nambu-Goldstone
Boson (NGB) composite Higgs and partial compositeness, admitting a weakly
coupled description of the composite sector. This is identified as the low
energy description of an SO(N) supersymmetric gauge theory with matter fields
in the fundamental of the group. The Higgs is a NGB associated to an
SO(5)/SO(4) coset of a global symmetry group and is identified with certain
components of matter fields in a Seiberg dual description of the theory. The
Standard Model (SM) gauge fields are obtained by gauging a subgroup of the
global group. The mass mixing between elementary SM and composite fermion
fields advocated in partial compositeness arise from the flow in the IR of
certain trilinear Yukawa couplings defined in the UV theory. We explicitly
construct two models of this kind. Most qualitative properties of the bottom-up
constructions are derived. The masses of gauge and fermion resonances in the
composite sector are governed by different couplings and can naturally be
separated. Accommodating all SM fermion masses within the partial compositeness
paradigm remains the main open problem, since the SM gauge couplings develop
Landau poles at unacceptably low energies.
| [
{
"created": "Fri, 30 Nov 2012 15:37:11 GMT",
"version": "v1"
},
{
"created": "Tue, 22 Jan 2013 14:37:15 GMT",
"version": "v2"
}
] | 2015-06-12 | [
[
"Caracciolo",
"Francesco",
""
],
[
"Parolini",
"Alberto",
""
],
[
"Serone",
"Marco",
""
]
] | We construct UV completions of bottom-up models with a pseudo Nambu-Goldstone Boson (NGB) composite Higgs and partial compositeness, admitting a weakly coupled description of the composite sector. This is identified as the low energy description of an SO(N) supersymmetric gauge theory with matter fields in the fundamental of the group. The Higgs is a NGB associated to an SO(5)/SO(4) coset of a global symmetry group and is identified with certain components of matter fields in a Seiberg dual description of the theory. The Standard Model (SM) gauge fields are obtained by gauging a subgroup of the global group. The mass mixing between elementary SM and composite fermion fields advocated in partial compositeness arise from the flow in the IR of certain trilinear Yukawa couplings defined in the UV theory. We explicitly construct two models of this kind. Most qualitative properties of the bottom-up constructions are derived. The masses of gauge and fermion resonances in the composite sector are governed by different couplings and can naturally be separated. Accommodating all SM fermion masses within the partial compositeness paradigm remains the main open problem, since the SM gauge couplings develop Landau poles at unacceptably low energies. |
1809.09110 | Eric Madge | Eric Madge, Pedro Schwaller | Leptophilic dark matter from gauged lepton number: Phenomenology and
gravitational wave signatures | 36 pages + appendix, 24 figures. Version accepted for publication in
JHEP | null | 10.1007/JHEP02(2019)048 | MITP/18-088 | hep-ph astro-ph.CO hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | New gauge symmetries often appear in theories beyond the Standard Model. Here
we study a model where lepton number is promoted to a gauge symmetry. Anomaly
cancellation requires the introduction of additional leptons, the lightest of
which is a natural leptophilic dark matter candidate. We perform a
comprehensive study of both collider and dark matter phenomenology. Furthermore
we find that the model exhibits a first order lepton number breaking phase
transition in large regions of parameter space. The corresponding gravitational
wave signal is computed, and its detectability at LISA and other future GW
detectors assessed. Finally we comment on the complementarity of dark matter,
collider and gravitational wave observables, and on the potential reach of
future colliders.
| [
{
"created": "Mon, 24 Sep 2018 18:00:01 GMT",
"version": "v1"
},
{
"created": "Mon, 22 Oct 2018 16:13:29 GMT",
"version": "v2"
},
{
"created": "Wed, 27 Feb 2019 16:21:34 GMT",
"version": "v3"
}
] | 2019-02-28 | [
[
"Madge",
"Eric",
""
],
[
"Schwaller",
"Pedro",
""
]
] | New gauge symmetries often appear in theories beyond the Standard Model. Here we study a model where lepton number is promoted to a gauge symmetry. Anomaly cancellation requires the introduction of additional leptons, the lightest of which is a natural leptophilic dark matter candidate. We perform a comprehensive study of both collider and dark matter phenomenology. Furthermore we find that the model exhibits a first order lepton number breaking phase transition in large regions of parameter space. The corresponding gravitational wave signal is computed, and its detectability at LISA and other future GW detectors assessed. Finally we comment on the complementarity of dark matter, collider and gravitational wave observables, and on the potential reach of future colliders. |
hep-ph/0010315 | Peter Landshoff | P V Landshoff | Pomeron physics: an update | 12 pages, 23 figures embedded with epsf Summary talk at
Diffraction2000, Calabria, September 2000 | Nucl.Phys.Proc.Suppl. 99A (2001) 311-322 | 10.1016/S0920-5632(01)01351-2 | DAMTP-2000-122 | hep-ph hep-ex | null | Key issues in pomeron physics include whether the hard and soft pomerons are
distinct objects, and whether the hard pomeron is already present in amplitudes
at $Q^2=0$. It is urgent to learn how to combine perturbative and
nonperturbative concepts, and to construct a sound theory of perturbative
evolution at small $x$. Other questions are whether screening corrections are
small, and gap survival probabilities large. Finally, do diffractive processes
present a good way to discover the Higgs?
| [
{
"created": "Fri, 27 Oct 2000 08:56:45 GMT",
"version": "v1"
}
] | 2009-10-31 | [
[
"Landshoff",
"P V",
""
]
] | Key issues in pomeron physics include whether the hard and soft pomerons are distinct objects, and whether the hard pomeron is already present in amplitudes at $Q^2=0$. It is urgent to learn how to combine perturbative and nonperturbative concepts, and to construct a sound theory of perturbative evolution at small $x$. Other questions are whether screening corrections are small, and gap survival probabilities large. Finally, do diffractive processes present a good way to discover the Higgs? |
1510.07849 | Artem Lipatov | A.A. Grinyuk, A.V. Lipatov, G.I. Lykasov, N.P. Zotov | Significance of non-perturbative input to TMD gluon density for hard
processes at LHC | 21 pages, 13 figures | Phys. Rev. D 93, 014035 (2016) | 10.1103/PhysRevD.93.014035 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the role of the non-perturbative input to the transverse momentum
dependent (TMD) gluon density in hard processes at the LHC. We derive the input
TMD gluon distribution at low scale mu0^2 ~ 1 GeV^2 from the fit of the
inclusive hadron spectra measured at low transverse momenta in pp collisions at
the LHC and demonstrate that the best description of these spectra for larger
hadron transverse momenta can be achieved by matching the derived TMD gluon
distribution with the exact solution of the Balitsky-Fadin-Kuraev-Lipatov
(BFKL) equation obtained at low x and small gluon transverse momenta outside
the saturation region. Then, we extend the input TMD gluon density to higher
mu^2 numerically using the Catani-Ciafoloni-Fiorani-Marchesini (CCFM) gluon
evolution equation. A special attention is put to the phenomenological
applications of obtained TMD gluon density to some LHC processes, which are
sensitive to the gluon content of a proton.
| [
{
"created": "Tue, 27 Oct 2015 10:40:27 GMT",
"version": "v1"
},
{
"created": "Sat, 30 Jan 2016 11:01:00 GMT",
"version": "v2"
}
] | 2016-02-03 | [
[
"Grinyuk",
"A. A.",
""
],
[
"Lipatov",
"A. V.",
""
],
[
"Lykasov",
"G. I.",
""
],
[
"Zotov",
"N. P.",
""
]
] | We study the role of the non-perturbative input to the transverse momentum dependent (TMD) gluon density in hard processes at the LHC. We derive the input TMD gluon distribution at low scale mu0^2 ~ 1 GeV^2 from the fit of the inclusive hadron spectra measured at low transverse momenta in pp collisions at the LHC and demonstrate that the best description of these spectra for larger hadron transverse momenta can be achieved by matching the derived TMD gluon distribution with the exact solution of the Balitsky-Fadin-Kuraev-Lipatov (BFKL) equation obtained at low x and small gluon transverse momenta outside the saturation region. Then, we extend the input TMD gluon density to higher mu^2 numerically using the Catani-Ciafoloni-Fiorani-Marchesini (CCFM) gluon evolution equation. A special attention is put to the phenomenological applications of obtained TMD gluon density to some LHC processes, which are sensitive to the gluon content of a proton. |
hep-ph/0112171 | Carl Albright | Carl H. Albright (Northern Illinois U. and Fermilab), S. Geer
(Fermilab) | Comparison of LMA and LOW Solar Solution Predictions in an SO(10) GUT
Model | Title, abstract and emphasis changed, references added | Phys.Lett. B532 (2002) 311-317 | 10.1016/S0370-2693(02)01575-7 | FERMILAB-Pub-01/374-T | hep-ph hep-ex | null | Within the framework of an SO(10) GUT model that can accommodate both the LMA
and LOW solar neutrino mixing solutions by appropriate choice of the
right-handed Majorana matrix elements, we present explicit predictions for the
neutrino oscillation parameters \Delta m^2_{21}, \sin^2 2\theta_{12}, \sin^2
2\theta_{23}, \sin^2 2\theta_{13}, and \delta_{CP}. Given the observed near
maximality of the atmospheric mixing, the model favors the LMA solution and
predicts that \delta_{CP} is small. The suitability of Neutrino Superbeams and
Neutrino Factories for precision tests of the two model versions is discussed.
| [
{
"created": "Wed, 12 Dec 2001 20:39:48 GMT",
"version": "v1"
},
{
"created": "Fri, 15 Feb 2002 19:45:30 GMT",
"version": "v2"
}
] | 2009-11-07 | [
[
"Albright",
"Carl H.",
"",
"Northern Illinois U. and Fermilab"
],
[
"Geer",
"S.",
"",
"Fermilab"
]
] | Within the framework of an SO(10) GUT model that can accommodate both the LMA and LOW solar neutrino mixing solutions by appropriate choice of the right-handed Majorana matrix elements, we present explicit predictions for the neutrino oscillation parameters \Delta m^2_{21}, \sin^2 2\theta_{12}, \sin^2 2\theta_{23}, \sin^2 2\theta_{13}, and \delta_{CP}. Given the observed near maximality of the atmospheric mixing, the model favors the LMA solution and predicts that \delta_{CP} is small. The suitability of Neutrino Superbeams and Neutrino Factories for precision tests of the two model versions is discussed. |
1811.11860 | Andreas Ringwald | Anne Ernst, Luca Di Luzio, Andreas Ringwald, Carlos Tamarit | Axion properties in GUTs | 15 pages, 4 figures, invited talk at the Corfu Summer Institute 2018
"School and Workshops on Elementary Particle Physics and Gravity"
(CORFU2018), 31 August - 28 September, 2018, Corfu, Greece | null | null | DESY 18-205, TUM-HEP-1175-18 | hep-ph hep-ex | http://creativecommons.org/licenses/by/4.0/ | We summarize recent studies of realistic nonsupersymmetric Grand Unified
Theories (GUTs) extended with a global $U(1)_{\rm PQ}$ symmetry, so as to
accommodate the axion solution to the strong CP problem. Aside from solving the
CP problem and unifying the gauge structure of the SM, these models can also
yield realistic spectra and mixings, including neutrino masses, and allowing
for a consistent cosmological history that accounts for inflation, dark matter
and baryogenesis. In our studies of $SO(10)$ and $SU(5)$ theories, we
determined the mass and couplings of the axion in terms of the relevant
threshold scales, and assessed how the former are constrained from the
requirements of gauge coupling unification, proton decay searches and collider
bounds. The axion mass ends up being rather constrained for GUT scale axions,
particularly in the case of $SU(5)$, and could be probed by upcoming dark
matter experiments, such as ABRACADABRA and CASPEr-Electric.
| [
{
"created": "Wed, 28 Nov 2018 22:16:23 GMT",
"version": "v1"
}
] | 2018-11-30 | [
[
"Ernst",
"Anne",
""
],
[
"Di Luzio",
"Luca",
""
],
[
"Ringwald",
"Andreas",
""
],
[
"Tamarit",
"Carlos",
""
]
] | We summarize recent studies of realistic nonsupersymmetric Grand Unified Theories (GUTs) extended with a global $U(1)_{\rm PQ}$ symmetry, so as to accommodate the axion solution to the strong CP problem. Aside from solving the CP problem and unifying the gauge structure of the SM, these models can also yield realistic spectra and mixings, including neutrino masses, and allowing for a consistent cosmological history that accounts for inflation, dark matter and baryogenesis. In our studies of $SO(10)$ and $SU(5)$ theories, we determined the mass and couplings of the axion in terms of the relevant threshold scales, and assessed how the former are constrained from the requirements of gauge coupling unification, proton decay searches and collider bounds. The axion mass ends up being rather constrained for GUT scale axions, particularly in the case of $SU(5)$, and could be probed by upcoming dark matter experiments, such as ABRACADABRA and CASPEr-Electric. |
hep-ph/9710280 | Jiri Rames | Sarka Todorova-Nova, Jiri Rames | Simulation of Bose-Einstein effect using space-time aspects of Lund
string fragmentation model | 26 pages, Latex, 17 figures in PS format attached | null | null | IReS 97-29, PRA-HEP 97/16 | hep-ph | null | The experimentally observed enhancement of number of close boson pairs in
e+e- collisions is reproduced by local weighting according to the quantum
mechanical prescriptions for production of identical bosons. The space-time
picture of the process, inherently present in the Lund fragmentation model, is
explicitly used. The model is used to check systematic errors in the W mass
measurements due to the Bose-Einstein effect. The possibility of direct
implementation of the Bose-Einstein effect into string fragmentation is
discussed.
| [
{
"created": "Wed, 8 Oct 1997 09:31:28 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Todorova-Nova",
"Sarka",
""
],
[
"Rames",
"Jiri",
""
]
] | The experimentally observed enhancement of number of close boson pairs in e+e- collisions is reproduced by local weighting according to the quantum mechanical prescriptions for production of identical bosons. The space-time picture of the process, inherently present in the Lund fragmentation model, is explicitly used. The model is used to check systematic errors in the W mass measurements due to the Bose-Einstein effect. The possibility of direct implementation of the Bose-Einstein effect into string fragmentation is discussed. |
2208.08791 | Ajay Kumar Rai | Keval Gandhi and Ajay Kumar Rai | Study of B, Bs mesons using heavy quark effective theory | 13 pages Accepted for publication in EPJC | Eur. Phys. J C 82, 777 (2022) | 10.1140/epjc/s10052-022-10719-w | null | hep-ph | http://creativecommons.org/licenses/by/4.0/ | Inspired by the lower statistical information in the bottom {\bf sector, in
this paper, we} calculate the masses and the strong decays of excited $B$ and
$B_s$ mesons in the framework of heavy quark effective theory (HQET). Using an
effective chiral Lagrangian approach based on heavy quark spin-flavor and light
quark chiral symmetry, we explore the flavor independent parameters
$\Delta_F^{(c)} = \Delta_F^{(b)}$ and $\lambda_F^{(c)} = \lambda_F^{(b)}$ to
calculate the masses of experimentally unknown bottom mesons. Our predictions
are consistent with the available experimental results and other theoretical
studies. Their strong decay to the ground state bottom mesons plus light
pseudoscalar mesons is calculated in terms of the square of the couplings
$g_H$, $g_S$, $g_T$, $g_X$, $g_Y$, and $g_R$. The weighted average value of the
couplings $g_H$, $g_S$ and $g_T$ {\bf is} obtained in the charm sector [Phys.
Rev. D \textbf{86}, 054024 (2012)] by fitting the calculated decay widths with
experimental measurements, which will be used in the present study to analyze
the strong decays of excited open bottom mesons. Moreover, the ratio of the
decay rates is also predicted, which can be countered with future experimental
data.
| [
{
"created": "Thu, 18 Aug 2022 12:06:27 GMT",
"version": "v1"
}
] | 2022-09-05 | [
[
"Gandhi",
"Keval",
""
],
[
"Rai",
"Ajay Kumar",
""
]
] | Inspired by the lower statistical information in the bottom {\bf sector, in this paper, we} calculate the masses and the strong decays of excited $B$ and $B_s$ mesons in the framework of heavy quark effective theory (HQET). Using an effective chiral Lagrangian approach based on heavy quark spin-flavor and light quark chiral symmetry, we explore the flavor independent parameters $\Delta_F^{(c)} = \Delta_F^{(b)}$ and $\lambda_F^{(c)} = \lambda_F^{(b)}$ to calculate the masses of experimentally unknown bottom mesons. Our predictions are consistent with the available experimental results and other theoretical studies. Their strong decay to the ground state bottom mesons plus light pseudoscalar mesons is calculated in terms of the square of the couplings $g_H$, $g_S$, $g_T$, $g_X$, $g_Y$, and $g_R$. The weighted average value of the couplings $g_H$, $g_S$ and $g_T$ {\bf is} obtained in the charm sector [Phys. Rev. D \textbf{86}, 054024 (2012)] by fitting the calculated decay widths with experimental measurements, which will be used in the present study to analyze the strong decays of excited open bottom mesons. Moreover, the ratio of the decay rates is also predicted, which can be countered with future experimental data. |
1107.3296 | J.D. Vergados | J.D. Vergados (Theoretical Physics Division, University of Ioannina,
Ioannina, Greece) | Transition Operators Entering Neutrinoles Double Electron Capture to
Excited Nuclear States | 9 LaTex pages, 2 figures, 1 table, references added | null | 10.1103/PhysRevC.84.044328 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We construct the effective transition operators relevant for neutrinoless
double electron capture leading to final nuclear states different than $0^{+}$.
From the structure of these operators we see that, if such a process is
observed experimentally, it will be very helpful in singling out the very
important light neutrino mass contribution from the other lepton violating
mechanisms
| [
{
"created": "Sun, 17 Jul 2011 12:51:01 GMT",
"version": "v1"
},
{
"created": "Tue, 2 Aug 2011 12:47:25 GMT",
"version": "v2"
}
] | 2015-05-28 | [
[
"Vergados",
"J. D.",
"",
"Theoretical Physics Division, University of Ioannina,\n Ioannina, Greece"
]
] | We construct the effective transition operators relevant for neutrinoless double electron capture leading to final nuclear states different than $0^{+}$. From the structure of these operators we see that, if such a process is observed experimentally, it will be very helpful in singling out the very important light neutrino mass contribution from the other lepton violating mechanisms |
1711.08213 | Hungchong Kim | Hungchong Kim, K. S. Kim, Myung-Ki Cheoun, Makoto Oka | Tetraquark mixing framework for isoscalar resonances in light mesons | 16 pages, 2 figures, slightly modified, 2 references added | Phys. Rev. D 97, 094005 (2018) | 10.1103/PhysRevD.97.094005 | null | hep-ph hep-ex nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Recently, a tetraquark mixing framework has been proposed for light mesons
and applied more or less successfully to the isovector resonances, $a_0(980),
a_0(1450)$, as well as to the isodoublet resonances, $K^*_0(800), K^*_0(1430)$.
In this work, we present a more extensive view on the mixing framework and
extend this to the isoscalar resonances, $f_0 (500)$, $f_0(980)$, $f_0 (1370)$,
$f_0(1500)$. Tetraquarks in this framework can have two spin configurations
containing either spin-0 diquark or spin-1 diquark and each configuration forms
a nonet in flavor space. The two spin configurations are found to mix strongly
through the color-spin interactions. Their mixtures, which diagonalize the
hyperfine masses, can generate the physical resonances constituting the two
nonets, which, in fact, coincide roughly with the experimental observation. We
identify that $f_0 (500)$, $f_0(980)$ are the isoscalar members in the light
nonet, and $f_0 (1370)$, $f_0(1500)$ are the similar members in the heavy
nonet. This means that the spin configuration mixing, as it relates the
corresponding members in the two nonets, can generate $f_0 (500), f_0 (1370)$
among the members in light mass, and $f_0(980), f_0(1500)$ in heavy mass. The
complication arises because the isoscalar members of each nonet are subject to
an additional flavor mixing known as OZI rule so that $f_0 (500), f_0 (980)$,
and similarly $f_0 (1370), f_0 (1500)$, are the mixture of two isoscalar
members belonging to an octet and a singlet in SU$_f$(3). The tetraquark mixing
framework including the flavor mixing is tested for the isoscalar resonances in
terms of the mass splitting and the fall-apart decay modes.
| [
{
"created": "Wed, 22 Nov 2017 10:31:16 GMT",
"version": "v1"
},
{
"created": "Wed, 14 Feb 2018 02:02:16 GMT",
"version": "v2"
}
] | 2018-05-16 | [
[
"Kim",
"Hungchong",
""
],
[
"Kim",
"K. S.",
""
],
[
"Cheoun",
"Myung-Ki",
""
],
[
"Oka",
"Makoto",
""
]
] | Recently, a tetraquark mixing framework has been proposed for light mesons and applied more or less successfully to the isovector resonances, $a_0(980), a_0(1450)$, as well as to the isodoublet resonances, $K^*_0(800), K^*_0(1430)$. In this work, we present a more extensive view on the mixing framework and extend this to the isoscalar resonances, $f_0 (500)$, $f_0(980)$, $f_0 (1370)$, $f_0(1500)$. Tetraquarks in this framework can have two spin configurations containing either spin-0 diquark or spin-1 diquark and each configuration forms a nonet in flavor space. The two spin configurations are found to mix strongly through the color-spin interactions. Their mixtures, which diagonalize the hyperfine masses, can generate the physical resonances constituting the two nonets, which, in fact, coincide roughly with the experimental observation. We identify that $f_0 (500)$, $f_0(980)$ are the isoscalar members in the light nonet, and $f_0 (1370)$, $f_0(1500)$ are the similar members in the heavy nonet. This means that the spin configuration mixing, as it relates the corresponding members in the two nonets, can generate $f_0 (500), f_0 (1370)$ among the members in light mass, and $f_0(980), f_0(1500)$ in heavy mass. The complication arises because the isoscalar members of each nonet are subject to an additional flavor mixing known as OZI rule so that $f_0 (500), f_0 (980)$, and similarly $f_0 (1370), f_0 (1500)$, are the mixture of two isoscalar members belonging to an octet and a singlet in SU$_f$(3). The tetraquark mixing framework including the flavor mixing is tested for the isoscalar resonances in terms of the mass splitting and the fall-apart decay modes. |
0808.2113 | Yuming Wang | M. Jamil Aslam, Yu-Ming Wang and Cai-Dian Lu | Exclusive semileptonic decays of $\Lambda_b \to \Lambda l^{+} l^{-}$ in
supersymmetric theories | 26 pages, 8 figures | Phys.Rev.D78:114032,2008 | 10.1103/PhysRevD.78.114032 | null | hep-ph | http://creativecommons.org/licenses/by/3.0/ | The weak decays of $\Lambda_b \to \Lambda l^{+} l^{-}$ ($l=e, \mu$) are
investigated in Minimal Supersymmetric Standard Model (MSSM) and also in
Supersymmetric (SUSY) SO(10) Grand Unified Models. In MSSM the special
attention is paid to the Neutral Higgs Bosons (NHBs) as they make quite a large
contribution in exclusive $B \to X_{s} l^{+} l^{-}$ decays at large
$\tan{\beta}$ regions of parameter space of SUSY models, since part of SUSY
contributions is proportional to $\tan^{3}{\beta}$. The analysis of decay rate,
forward-backward asymmetries, lepton polarization asymmetries and the
polarization asymmetries of $\Lambda $ baryon in $\Lambda_b \to \Lambda l^{+}
l^{-}$ show that the values of these physical observables are greatly modified
by the effects of NHBs. In SUSY SO(10) GUT model, the new physics contribution
comes from the operators which are induced by the NHBs penguins and also from
the operators having chirality opposite to that of the corresponding SM
operators. SUSY SO(10) effects show up only in the decay $\Lambda_b \to \Lambda
+\tau^{+} \tau^{-}$ where the longitudinal and transverse lepton polarization
asymmetries are deviate significantly from the SM value while the effects in
the decay rate, forward-backward asymmetries and polarization asymmetries of
final state $\Lambda$ baryon are very mild. The transverse lepton polarization
asymmetry in $\Lambda_b \to \Lambda +\tau^{+} \tau^{-}$ is almost zero in SM
and in MSSM model. However, it can reach to -0.1 in SUSY SO(10) GUT model and
could be seen at the future colliders; hence this asymmetry observable will
provide us useful information to probe new physics and discriminate between
different models.
| [
{
"created": "Fri, 15 Aug 2008 13:06:29 GMT",
"version": "v1"
}
] | 2009-01-08 | [
[
"Aslam",
"M. Jamil",
""
],
[
"Wang",
"Yu-Ming",
""
],
[
"Lu",
"Cai-Dian",
""
]
] | The weak decays of $\Lambda_b \to \Lambda l^{+} l^{-}$ ($l=e, \mu$) are investigated in Minimal Supersymmetric Standard Model (MSSM) and also in Supersymmetric (SUSY) SO(10) Grand Unified Models. In MSSM the special attention is paid to the Neutral Higgs Bosons (NHBs) as they make quite a large contribution in exclusive $B \to X_{s} l^{+} l^{-}$ decays at large $\tan{\beta}$ regions of parameter space of SUSY models, since part of SUSY contributions is proportional to $\tan^{3}{\beta}$. The analysis of decay rate, forward-backward asymmetries, lepton polarization asymmetries and the polarization asymmetries of $\Lambda $ baryon in $\Lambda_b \to \Lambda l^{+} l^{-}$ show that the values of these physical observables are greatly modified by the effects of NHBs. In SUSY SO(10) GUT model, the new physics contribution comes from the operators which are induced by the NHBs penguins and also from the operators having chirality opposite to that of the corresponding SM operators. SUSY SO(10) effects show up only in the decay $\Lambda_b \to \Lambda +\tau^{+} \tau^{-}$ where the longitudinal and transverse lepton polarization asymmetries are deviate significantly from the SM value while the effects in the decay rate, forward-backward asymmetries and polarization asymmetries of final state $\Lambda$ baryon are very mild. The transverse lepton polarization asymmetry in $\Lambda_b \to \Lambda +\tau^{+} \tau^{-}$ is almost zero in SM and in MSSM model. However, it can reach to -0.1 in SUSY SO(10) GUT model and could be seen at the future colliders; hence this asymmetry observable will provide us useful information to probe new physics and discriminate between different models. |
hep-ph/9603428 | Daniel Boer | D. Boer and R.D. Tangerman | Higher-twist quark-mass contributions to deep-inelastic scattering | 10 pages, REVTEX, 3 figures included | Phys.Lett. B381 (1996) 305-310 | 10.1016/0370-2693(96)00541-2 | NIKHEF 96-016 | hep-ph | null | In this letter we extend the factorization procedure of the deep-inelastic
hadron tensor, proposed by Qiu, to include non-zero quark masses. The manifest
gauge invariance of both soft and hard parts is preserved. Using a so-called
spurion to generate the quark-mass terms, the simple parton-model
interpretation is also kept. The calculation of the deep-inelastic
transverse-spin structure function $g_2$ is used to illustrate the algorithm.
| [
{
"created": "Thu, 28 Mar 1996 10:57:55 GMT",
"version": "v1"
}
] | 2009-10-28 | [
[
"Boer",
"D.",
""
],
[
"Tangerman",
"R. D.",
""
]
] | In this letter we extend the factorization procedure of the deep-inelastic hadron tensor, proposed by Qiu, to include non-zero quark masses. The manifest gauge invariance of both soft and hard parts is preserved. Using a so-called spurion to generate the quark-mass terms, the simple parton-model interpretation is also kept. The calculation of the deep-inelastic transverse-spin structure function $g_2$ is used to illustrate the algorithm. |
1503.04839 | Christian Weiss | C. Granados and C. Weiss | Light-front representation of chiral dynamics in peripheral transverse
densities | 28 pages, 9 figures | null | 10.1007/JHEP07(2015)170 | JLAB-THY-15-2018 | hep-ph nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The nucleon's electromagnetic form factors are expressed in terms of the
transverse densities of charge and magnetization at fixed light-front time. At
peripheral transverse distances $b = O(M_\pi^{-1})$ the densities are governed
by chiral dynamics and can be calculated model-independently using chiral
effective field theory (EFT). We represent the leading-order chiral EFT results
for the peripheral transverse densities as overlap integrals of chiral
light-front wave functions, describing the transition of the initial nucleon to
soft pion-nucleon intermediate states and back. The new representation (a)
explains the parametric order of the peripheral transverse densities; (b)
establishes an inequality between the spin-independent and -dependent
densities; (c) exposes the role of pion orbital angular momentum in chiral
dynamics; (d) reveals a large left-right asymmetry of the current in a
transversely polarized nucleon and suggests a simple interpretation. The
light-front representation enables a first-quantized, quantum-mechanical view
of chiral dynamics that is fully relativistic and exactly equivalent to the
second-quantized, field-theoretical formulation. It relates the charge and
magnetization densities measured in low-energy elastic scattering to the
generalized parton distributions probed in peripheral high-energy scattering
processes. The method can be applied to nucleon form factors of other
operators, e.g. the energy-momentum tensor.
| [
{
"created": "Mon, 16 Mar 2015 20:41:51 GMT",
"version": "v1"
}
] | 2015-09-02 | [
[
"Granados",
"C.",
""
],
[
"Weiss",
"C.",
""
]
] | The nucleon's electromagnetic form factors are expressed in terms of the transverse densities of charge and magnetization at fixed light-front time. At peripheral transverse distances $b = O(M_\pi^{-1})$ the densities are governed by chiral dynamics and can be calculated model-independently using chiral effective field theory (EFT). We represent the leading-order chiral EFT results for the peripheral transverse densities as overlap integrals of chiral light-front wave functions, describing the transition of the initial nucleon to soft pion-nucleon intermediate states and back. The new representation (a) explains the parametric order of the peripheral transverse densities; (b) establishes an inequality between the spin-independent and -dependent densities; (c) exposes the role of pion orbital angular momentum in chiral dynamics; (d) reveals a large left-right asymmetry of the current in a transversely polarized nucleon and suggests a simple interpretation. The light-front representation enables a first-quantized, quantum-mechanical view of chiral dynamics that is fully relativistic and exactly equivalent to the second-quantized, field-theoretical formulation. It relates the charge and magnetization densities measured in low-energy elastic scattering to the generalized parton distributions probed in peripheral high-energy scattering processes. The method can be applied to nucleon form factors of other operators, e.g. the energy-momentum tensor. |
0806.3341 | Ralf Rapp | R. Rapp, D. Cabrera, V. Greco, M. Mannarelli, H. van Hees | Heavy Flavor in the sQGP | 6 pages, 12 eps-figs, Proc. of 24. Winter Workshop on Nuclear
Dynamics, South Padre Island (TX, USA), April 05-12, 2008 | null | null | null | hep-ph nucl-ex nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We attempt a unified treatment of heavy quarkonia and heavy-quark diffusion
in the Quark-Gluon Plasma. Our approach is based on finite-temperature
T-matrices with interaction potentials estimated from the heavy-quark internal
energy computed in thermal lattice QCD (lQCD). In the charmonium sector S-wave
bound states (J/\psi, \eta_c) survive up to temperatures of ~2 T_c, not
inconsistent with constraints from euclidean correlation functions in lQCD. In
the open-heavy flavor sector, the T-matrix interaction reduces heavy-quark
diffusion substantially, leading to fair agreement with single-electron spectra
at RHIC and suggestive for a small viscosity-to-entropy ratio close to T_c.
| [
{
"created": "Fri, 20 Jun 2008 13:54:17 GMT",
"version": "v1"
}
] | 2008-06-23 | [
[
"Rapp",
"R.",
""
],
[
"Cabrera",
"D.",
""
],
[
"Greco",
"V.",
""
],
[
"Mannarelli",
"M.",
""
],
[
"van Hees",
"H.",
""
]
] | We attempt a unified treatment of heavy quarkonia and heavy-quark diffusion in the Quark-Gluon Plasma. Our approach is based on finite-temperature T-matrices with interaction potentials estimated from the heavy-quark internal energy computed in thermal lattice QCD (lQCD). In the charmonium sector S-wave bound states (J/\psi, \eta_c) survive up to temperatures of ~2 T_c, not inconsistent with constraints from euclidean correlation functions in lQCD. In the open-heavy flavor sector, the T-matrix interaction reduces heavy-quark diffusion substantially, leading to fair agreement with single-electron spectra at RHIC and suggestive for a small viscosity-to-entropy ratio close to T_c. |
0705.4227 | Federico Urban | C. Bambi, F.R. Urban | Brane Cosmology and KK Gravitinos | 19 pages, references added, IoP style | JCAP0709:018,2007 | 10.1088/1475-7516/2007/09/018 | null | hep-ph astro-ph | null | The cosmology of KK gravitinos in models with extra dimensions is considered.
The main result is that the production of such KK modes is not compatible with
an epoch of non--standard expansion after inflation. This is so because the BBN
constraint on the zero mode forces the reduced five dimensional Planck mass
$M_5$ down to values much smaller than the usual four dimensional one, but this
in turn implies many KK states available for a given temperature. Once these
states are taken into account one finds that there is no $M_5$ for which the
produced KK gravitinos satisfy BBN and overclosure constraints. This conclusion
holds for both flat and warped models in which only gravity propagates in the
full spacetime.
| [
{
"created": "Tue, 29 May 2007 14:32:53 GMT",
"version": "v1"
},
{
"created": "Tue, 5 Jun 2007 21:42:47 GMT",
"version": "v2"
}
] | 2008-11-26 | [
[
"Bambi",
"C.",
""
],
[
"Urban",
"F. R.",
""
]
] | The cosmology of KK gravitinos in models with extra dimensions is considered. The main result is that the production of such KK modes is not compatible with an epoch of non--standard expansion after inflation. This is so because the BBN constraint on the zero mode forces the reduced five dimensional Planck mass $M_5$ down to values much smaller than the usual four dimensional one, but this in turn implies many KK states available for a given temperature. Once these states are taken into account one finds that there is no $M_5$ for which the produced KK gravitinos satisfy BBN and overclosure constraints. This conclusion holds for both flat and warped models in which only gravity propagates in the full spacetime. |
2406.02647 | Saleh Sultansoy | Dilara Akturk, Burak Dagli, Bora Ketenoglu, Arif Ozturk, Saleh
Sultansoy | {\mu}TRISTAN and LHC/Tevatron/FCC/SppC Based Antimuon-Hadron Colliders | 13 pages, 19 Tables A section on physics search potential is added | null | null | null | hep-ph hep-ex physics.acc-ph | http://creativecommons.org/licenses/by/4.0/ | Recently, the construction of {\mu^+}{e^-} and {\mu^+}{\mu^+} colliders,
{\mu}TRISTAN, at KEK has been proposed. We argue that the construction of a
similar {\mu^+} ring tangential to LHC/Tevatron/FCC/SppC will give an
opportunity to realize {\mu^+}p and {\mu^+}A collisions at multi-TeV scale
center-of-mass energies. In this paper the main parameters of proposed
colliders have been studied. It is shown that sufficiently high luminosities
can be achieved for all proposals under consideration: L exceeds {10^{33}
cm^{-2}s^{-1}} for {\mu^+}p colliders and {10^{30} cm^{-2}s^{-1}} for {\mu^+}A
colliders. Certainly, proposed colliders will provide huge potential for both
SM (especially QCD basics) and BSM physics searches.
| [
{
"created": "Tue, 4 Jun 2024 14:11:56 GMT",
"version": "v1"
},
{
"created": "Mon, 29 Jul 2024 17:03:33 GMT",
"version": "v2"
}
] | 2024-07-30 | [
[
"Akturk",
"Dilara",
""
],
[
"Dagli",
"Burak",
""
],
[
"Ketenoglu",
"Bora",
""
],
[
"Ozturk",
"Arif",
""
],
[
"Sultansoy",
"Saleh",
""
]
] | Recently, the construction of {\mu^+}{e^-} and {\mu^+}{\mu^+} colliders, {\mu}TRISTAN, at KEK has been proposed. We argue that the construction of a similar {\mu^+} ring tangential to LHC/Tevatron/FCC/SppC will give an opportunity to realize {\mu^+}p and {\mu^+}A collisions at multi-TeV scale center-of-mass energies. In this paper the main parameters of proposed colliders have been studied. It is shown that sufficiently high luminosities can be achieved for all proposals under consideration: L exceeds {10^{33} cm^{-2}s^{-1}} for {\mu^+}p colliders and {10^{30} cm^{-2}s^{-1}} for {\mu^+}A colliders. Certainly, proposed colliders will provide huge potential for both SM (especially QCD basics) and BSM physics searches. |
2001.11514 | Michael Geller | Michael Geller and Ofri Telem | Self Destructing Atomic DM | null | Phys. Rev. D 104, 035010 (2021) | 10.1103/PhysRevD.104.035010 | null | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Self-Destructing Dark Matter (SDDM) is a class of dark sector models in which
the collision of a dark sector particle with the earth induces its prompt decay
into Standard Model particles, generating unique signals at neutrino detectors.
The inherent fragility of SDDM makes its survival from the early universe
unlikely, implying a late time production mechanism. We present an efficient
late time production mechanism for SDDM based on atomic rearrangement, the
mechanism responsible for muon or anti-proton capture in hydrogen. In this
model, an atomic rearrangement process occurs in our galaxy, converting dark
atoms into highly excited bound states - our SDDM candidates. While the
resulting SDDM is only a small fraction of the dark matter flux, its striking
self-destruction signals imply a significant discovery reach in the existing
data from the Super-Kamiokande experiment.
| [
{
"created": "Thu, 30 Jan 2020 19:00:02 GMT",
"version": "v1"
},
{
"created": "Wed, 5 Feb 2020 17:20:18 GMT",
"version": "v2"
}
] | 2021-08-18 | [
[
"Geller",
"Michael",
""
],
[
"Telem",
"Ofri",
""
]
] | Self-Destructing Dark Matter (SDDM) is a class of dark sector models in which the collision of a dark sector particle with the earth induces its prompt decay into Standard Model particles, generating unique signals at neutrino detectors. The inherent fragility of SDDM makes its survival from the early universe unlikely, implying a late time production mechanism. We present an efficient late time production mechanism for SDDM based on atomic rearrangement, the mechanism responsible for muon or anti-proton capture in hydrogen. In this model, an atomic rearrangement process occurs in our galaxy, converting dark atoms into highly excited bound states - our SDDM candidates. While the resulting SDDM is only a small fraction of the dark matter flux, its striking self-destruction signals imply a significant discovery reach in the existing data from the Super-Kamiokande experiment. |
2310.06520 | Callum Wilkinson | Callum Wilkinson and Alfonso Garcia Soto | A tolerable candle: the low-$\nu$ method with LHC neutrinos | null | null | null | null | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The Forward Physics Facility (FPF) plans to use neutrinos produced at the
Large Hadron Collider (LHC) to make a variety of measurements at previously
unexplored TeV energies. Its primary goals include precision measurements of
the neutrino cross section and using the measured neutrino flux both to uncover
information about far-forward hadron production and to search for various
beyond standard model scenarios. However, these goals have the potential to
conflict: extracting information about the flux or cross section relies upon an
assumption about the other. In this manuscript, we demonstrate that the FPF can
use the low-$\nu$ method -- a technique for constraining the flux shape by
isolating neutrino interactions with low energy transfer to the nucleus -- to
break this degeneracy. We show that the low-$\nu$ method is effective for
extracting the $\nu_{\mu}$ flux shape, in a model-independent way. We discuss
its application for extracting the $\bar{\nu}_{\mu}$ flux shape, but find that
this is significantly more model dependent. Finally, we explore the precision
to which the $\nu_{\mu}$ flux shape could be constrained at the FPF, for a
variety of proposed detector options. We find that the precision would be
sufficient to discriminate between various realistic flux models.
| [
{
"created": "Tue, 10 Oct 2023 11:04:54 GMT",
"version": "v1"
}
] | 2023-10-11 | [
[
"Wilkinson",
"Callum",
""
],
[
"Soto",
"Alfonso Garcia",
""
]
] | The Forward Physics Facility (FPF) plans to use neutrinos produced at the Large Hadron Collider (LHC) to make a variety of measurements at previously unexplored TeV energies. Its primary goals include precision measurements of the neutrino cross section and using the measured neutrino flux both to uncover information about far-forward hadron production and to search for various beyond standard model scenarios. However, these goals have the potential to conflict: extracting information about the flux or cross section relies upon an assumption about the other. In this manuscript, we demonstrate that the FPF can use the low-$\nu$ method -- a technique for constraining the flux shape by isolating neutrino interactions with low energy transfer to the nucleus -- to break this degeneracy. We show that the low-$\nu$ method is effective for extracting the $\nu_{\mu}$ flux shape, in a model-independent way. We discuss its application for extracting the $\bar{\nu}_{\mu}$ flux shape, but find that this is significantly more model dependent. Finally, we explore the precision to which the $\nu_{\mu}$ flux shape could be constrained at the FPF, for a variety of proposed detector options. We find that the precision would be sufficient to discriminate between various realistic flux models. |
hep-ph/0211342 | Gianfranco Bertone | Gianfranco Bertone, Geraldine Servant, Guenter Sigl | Indirect Detection of Kaluza-Klein Dark Matter | 8 pages, 9 figures, version accepted for publication in PRD | Phys.Rev. D68 (2003) 044008 | 10.1103/PhysRevD.68.044008 | null | hep-ph astro-ph | null | We investigate prospects for indirect detection of Kaluza--Klein dark matter,
focusing on the annihilation radiation of the first Kaluza--Klein excitation of
the Hypercharge gauge boson $B^{(1)}$ in the Galactic halo, in particular we
estimate neutrino, gamma-ray and synchrotron fluxes. Comparing the predicted
fluxes with observational data we are able to constrain the $B^{(1)}$ mass (and
therefore the compactification scale). The constraints depend on the specific
model adopted for the dark matter density profile. For a NFW profile the
analysis of synchrotron radiation puts a lower bound on the $B^{(1)}$ mass of
the order of $\simeq 300$ GeV.
| [
{
"created": "Thu, 21 Nov 2002 21:55:58 GMT",
"version": "v1"
},
{
"created": "Tue, 24 Jun 2003 15:48:40 GMT",
"version": "v2"
}
] | 2009-11-07 | [
[
"Bertone",
"Gianfranco",
""
],
[
"Servant",
"Geraldine",
""
],
[
"Sigl",
"Guenter",
""
]
] | We investigate prospects for indirect detection of Kaluza--Klein dark matter, focusing on the annihilation radiation of the first Kaluza--Klein excitation of the Hypercharge gauge boson $B^{(1)}$ in the Galactic halo, in particular we estimate neutrino, gamma-ray and synchrotron fluxes. Comparing the predicted fluxes with observational data we are able to constrain the $B^{(1)}$ mass (and therefore the compactification scale). The constraints depend on the specific model adopted for the dark matter density profile. For a NFW profile the analysis of synchrotron radiation puts a lower bound on the $B^{(1)}$ mass of the order of $\simeq 300$ GeV. |
2204.14032 | Jin-Li Zhang | Jin-Li Zhang, Guang-Zhen Kang, and Jia-Lun Ping | $\rho$ meson generalized parton distributions in the Nambu--Jona-Lasinio
model | 15 pages, 29 figures, accepted for publication in PRD | null | 10.1103/PhysRevD.105.094015 | null | hep-ph | http://creativecommons.org/licenses/by-nc-nd/4.0/ | In this paper, both the unpolarized and the polarized $\rho$ meson
generalized parton distributions are investigated in the framework of the
Nambu--Jona-Lasinio model using proper time regularization scheme. The symmetry
properties of $\rho$ meson generalized parton distributions are checked. The
three independent distribution functions in deep inelastic scattering,
$F_1(x)$, $b_1(x)$ and $g_1(x)$, and the Sachs-like charge, magnetic, and
quadruple form factors $G_C(t)$, $G_M(t)$ and $G_Q(t)$, which are the first
Mellin moments of unpolarized generalized parton distributions are obtained. In
addition, the $u$ quark axial vector form factors $\tilde{F}_1^u(t)$ and
$\tilde{F}_2^u(t)$ related to the axial currents from the polarized generalized
parton distributions are studied. The impact parameter dependent parton
distribution functions, which are the two-dimensional Fourier transform of
generalized parton distributions are studied, too. The obtained $\rho$ meson
generalized parton distributions satisfy the required properties well.
| [
{
"created": "Fri, 29 Apr 2022 11:58:34 GMT",
"version": "v1"
}
] | 2022-05-25 | [
[
"Zhang",
"Jin-Li",
""
],
[
"Kang",
"Guang-Zhen",
""
],
[
"Ping",
"Jia-Lun",
""
]
] | In this paper, both the unpolarized and the polarized $\rho$ meson generalized parton distributions are investigated in the framework of the Nambu--Jona-Lasinio model using proper time regularization scheme. The symmetry properties of $\rho$ meson generalized parton distributions are checked. The three independent distribution functions in deep inelastic scattering, $F_1(x)$, $b_1(x)$ and $g_1(x)$, and the Sachs-like charge, magnetic, and quadruple form factors $G_C(t)$, $G_M(t)$ and $G_Q(t)$, which are the first Mellin moments of unpolarized generalized parton distributions are obtained. In addition, the $u$ quark axial vector form factors $\tilde{F}_1^u(t)$ and $\tilde{F}_2^u(t)$ related to the axial currents from the polarized generalized parton distributions are studied. The impact parameter dependent parton distribution functions, which are the two-dimensional Fourier transform of generalized parton distributions are studied, too. The obtained $\rho$ meson generalized parton distributions satisfy the required properties well. |
1501.00993 | Andreas Crivellin | Andreas Crivellin, Giancarlo D'Ambrosio and Julian Heeck | Explaining $h\to\mu^\pm\tau^\mp$, $B\to K^* \mu^+\mu^-$ and $B\to K
\mu^+\mu^-/B\to K e^+e^-$ in a two-Higgs-doublet model with gauged
$L_\mu-L_\tau$ | 6 pages, 2 figures, corrected formula for LFV tau decay with new HFAG
limit. References added, accepted for publication in PRL | Phys. Rev. Lett. 114, 151801 (2015) | 10.1103/PhysRevLett.114.151801 | CERN-PH-TH-2015-001, ULB-TH/14-26 | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The LHC observed so far three deviations from the Standard Model (SM)
predictions in flavour observables: LHCb reported anomalies in $B\to K^*
\mu^+\mu^-$ and $R(K)=B\to K \mu^+\mu^-/B\to K e^+e^-$ while CMS found an
excess in $h\to\mu\tau$. We show, for the first time, how these deviations from
the SM can be explained within a single well-motivated model: a
two-Higgs-doublet model with gauged $L_\mu-L_\tau$ symmetry. We find that,
despite the constraints from $\tau\to\mu\mu\mu$ and $B_s$--$\overline{B}_s$
mixing, one can explain $h \to\mu\tau$, $B\to K^* \mu^+\mu^-$ and $R(K)$
simultaneously, obtaining interesting correlations among the observables.
| [
{
"created": "Mon, 5 Jan 2015 21:00:36 GMT",
"version": "v1"
},
{
"created": "Tue, 10 Mar 2015 15:11:09 GMT",
"version": "v2"
}
] | 2015-04-15 | [
[
"Crivellin",
"Andreas",
""
],
[
"D'Ambrosio",
"Giancarlo",
""
],
[
"Heeck",
"Julian",
""
]
] | The LHC observed so far three deviations from the Standard Model (SM) predictions in flavour observables: LHCb reported anomalies in $B\to K^* \mu^+\mu^-$ and $R(K)=B\to K \mu^+\mu^-/B\to K e^+e^-$ while CMS found an excess in $h\to\mu\tau$. We show, for the first time, how these deviations from the SM can be explained within a single well-motivated model: a two-Higgs-doublet model with gauged $L_\mu-L_\tau$ symmetry. We find that, despite the constraints from $\tau\to\mu\mu\mu$ and $B_s$--$\overline{B}_s$ mixing, one can explain $h \to\mu\tau$, $B\to K^* \mu^+\mu^-$ and $R(K)$ simultaneously, obtaining interesting correlations among the observables. |
2404.07899 | Daisuke Fujii | Daisuke Fujii, Akihiro Iwanaka, Masakiyo Kitazawa, Daiki Suenaga | Novel first-order phase transition and critical points in SU(3)
Yang-Mills theory with spatial compactification | 15 pages, 15 figures | null | null | null | hep-ph hep-lat hep-th | http://creativecommons.org/licenses/by/4.0/ | We investigate the thermodynamics and phase structure of $SU(3)$ Yang-Mills
theory on $\mathbb{T}^2\times\mathbb{R}^2$ in Euclidean spacetime in an
effective-model approach. The model incorporates two Polyakov loops along two
compactified directions as dynamical variables, and is constructed to reproduce
thermodynamics on $\mathbb{T}^2\times\mathbb{R}^2$ measured on the lattice. The
model analysis indicates the existence of a novel first-order phase transition
on $\mathbb{T}^2\times\mathbb{R}^2$ in the deconfined phase, which terminates
at critical points that should belong to the two-dimensional $Z_2$ universality
class. We argue that the interplay of the Polyakov loops induced by their cross
term in the Polyakov-loop potential is responsible for the manifestation of the
first-order transition.
| [
{
"created": "Thu, 11 Apr 2024 16:37:50 GMT",
"version": "v1"
}
] | 2024-04-12 | [
[
"Fujii",
"Daisuke",
""
],
[
"Iwanaka",
"Akihiro",
""
],
[
"Kitazawa",
"Masakiyo",
""
],
[
"Suenaga",
"Daiki",
""
]
] | We investigate the thermodynamics and phase structure of $SU(3)$ Yang-Mills theory on $\mathbb{T}^2\times\mathbb{R}^2$ in Euclidean spacetime in an effective-model approach. The model incorporates two Polyakov loops along two compactified directions as dynamical variables, and is constructed to reproduce thermodynamics on $\mathbb{T}^2\times\mathbb{R}^2$ measured on the lattice. The model analysis indicates the existence of a novel first-order phase transition on $\mathbb{T}^2\times\mathbb{R}^2$ in the deconfined phase, which terminates at critical points that should belong to the two-dimensional $Z_2$ universality class. We argue that the interplay of the Polyakov loops induced by their cross term in the Polyakov-loop potential is responsible for the manifestation of the first-order transition. |
2112.11307 | Matteo Rinaldi | Matteo Rinaldi and Vicente Vento | Glueballs at high temperature within the Hard-Wall holographic model | 13 pages, 10 figures. Published version on "The European Physical
Journal C" | null | 10.1140/epjc/s10052-022-10105-6 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this investigation an holographic description of the deconfined phase
transition of scalar and tensor glueballs is presented within the so called
hard-wall model. The spectra of these bound states of gluons have been
calculated from the linearized Einstein equations for a graviton propagating
from a thermal $AdS_5$ space to an AdS Black-Hole. In this framework, the
deconfined phase is reached via a two steps mechanism. We propose that the
transition between the AdS thermal sector to the BH is described via a first
order phase transition, with discontinuous masses at the critical temperature,
which has been determined by Herzog's method of regulating the free energy
densities. Then, the glueball masses diverge with increasing $T$ in the BH
phase and thus lead to deconfined states \`a la Hagedorn.
| [
{
"created": "Tue, 21 Dec 2021 15:52:06 GMT",
"version": "v1"
},
{
"created": "Tue, 15 Feb 2022 08:21:18 GMT",
"version": "v2"
}
] | 2022-03-02 | [
[
"Rinaldi",
"Matteo",
""
],
[
"Vento",
"Vicente",
""
]
] | In this investigation an holographic description of the deconfined phase transition of scalar and tensor glueballs is presented within the so called hard-wall model. The spectra of these bound states of gluons have been calculated from the linearized Einstein equations for a graviton propagating from a thermal $AdS_5$ space to an AdS Black-Hole. In this framework, the deconfined phase is reached via a two steps mechanism. We propose that the transition between the AdS thermal sector to the BH is described via a first order phase transition, with discontinuous masses at the critical temperature, which has been determined by Herzog's method of regulating the free energy densities. Then, the glueball masses diverge with increasing $T$ in the BH phase and thus lead to deconfined states \`a la Hagedorn. |
hep-ph/0608275 | Abel Miranda Dr | A. Miranda | Hamiltonian field theoretical model for a light quark condensate | 9 pages | null | null | null | hep-ph | null | I propose an alternative Hamiltonian field theoretical model for a light
quark condensate that is compatible with QCD in the deep infrared. Key
electroweak data on flavourless pseudoscalar mesons are used for necessary
renormalizations. Light quark inertial masses are redifined in a new and
broader theoretical context.
| [
{
"created": "Thu, 24 Aug 2006 12:26:19 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Miranda",
"A.",
""
]
] | I propose an alternative Hamiltonian field theoretical model for a light quark condensate that is compatible with QCD in the deep infrared. Key electroweak data on flavourless pseudoscalar mesons are used for necessary renormalizations. Light quark inertial masses are redifined in a new and broader theoretical context. |
hep-ph/0009134 | Folomeev V. N. | V. Folomeev, V. Gurovich and R. Usupov | The Spherical Relativistic Detonation of Scalaron Stars | LaTex, 5 pages, 3 figures | null | null | null | hep-ph | null | Now the hypothesis of existence of scalar fields of a various nature and
energy density in the modern Universe is intensively explored. It can explain a
nature of the dark (non- baryon) matter in the Universe and an existence of
positive $\Lambda $-term (see e.g. gr-qc/9904398). One of component of such
field has a cluster nature and organizes in the closed gravitational
configurations from galactic scales up to relativistic microscopic stars. In
the authors paper astro-ph/0008334 the hypothesis of detonation of such fields
was considered. As a result of phase transition behind the wavefront a
relativistic plasma of high energy density can appear. This process is similar
to a relativistic detonation and it can create macroscopic fireballs sufficient
for an explanation of the phenomenon of gamma-ray bursts (see e.g. the review
astro-ph/9907392). In astro-ph/0008334 it was supposed that the front of such
''detonation'' wave is entered by the flow of scalar fields with constant
energy density. If the size of the formed plasma configuration is commensurable
with the size of scalaron cluster, this hypothesis is not correct. It is
necessary to take into account a modification of the energy density of the
scalar field from centre to a periphery. It is changes the dynamics of the
fireball on principle. The indicated problem in framework of special relativity
is considered in this paper.
| [
{
"created": "Mon, 11 Sep 2000 22:51:19 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Folomeev",
"V.",
""
],
[
"Gurovich",
"V.",
""
],
[
"Usupov",
"R.",
""
]
] | Now the hypothesis of existence of scalar fields of a various nature and energy density in the modern Universe is intensively explored. It can explain a nature of the dark (non- baryon) matter in the Universe and an existence of positive $\Lambda $-term (see e.g. gr-qc/9904398). One of component of such field has a cluster nature and organizes in the closed gravitational configurations from galactic scales up to relativistic microscopic stars. In the authors paper astro-ph/0008334 the hypothesis of detonation of such fields was considered. As a result of phase transition behind the wavefront a relativistic plasma of high energy density can appear. This process is similar to a relativistic detonation and it can create macroscopic fireballs sufficient for an explanation of the phenomenon of gamma-ray bursts (see e.g. the review astro-ph/9907392). In astro-ph/0008334 it was supposed that the front of such ''detonation'' wave is entered by the flow of scalar fields with constant energy density. If the size of the formed plasma configuration is commensurable with the size of scalaron cluster, this hypothesis is not correct. It is necessary to take into account a modification of the energy density of the scalar field from centre to a periphery. It is changes the dynamics of the fireball on principle. The indicated problem in framework of special relativity is considered in this paper. |
1201.0189 | Zbigniew Was | Qingjun Xu and Z. Was | Bremsstrahlung simulation in K to pi l^pm nu_l (gamma) decays | 1+20 pages, 8 figures | EPJC 72:2158, 2012 | 10.1140/epjc/s10052-012-2158-z | IFJPAN-IV-2011-14; CERN-PH-TH/2011-309 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In physics simulation chains, the PHOTOS Monte Carlo program is often used to
simulate QED effects in decays of intermediate particles and resonances. The
program is based on an exact multiphoton phase space. In general, the matrix
element is obtained from iterations of a universal kernel and approximations
are involved. To evaluate the program precision, it is necessary to formulate
and implement within the generator the exact matrix element, which depends on
the decay channel. Then, all terms necessary for non-leading logarithms are
taken into account.
In the present letter we focus on the decay K to pi l^pm nu_l and tests of
the PHOTOS Monte Carlo program. We conclude a 0.2% relative precision in the
implementation of the hard photon matrix element into the emission kernel,
including the case where approximations are used.
| [
{
"created": "Fri, 30 Dec 2011 21:27:39 GMT",
"version": "v1"
},
{
"created": "Mon, 9 Jan 2012 08:33:46 GMT",
"version": "v2"
},
{
"created": "Mon, 16 Apr 2012 09:18:04 GMT",
"version": "v3"
},
{
"created": "Thu, 28 Jun 2012 09:02:37 GMT",
"version": "v4"
}
] | 2014-04-23 | [
[
"Xu",
"Qingjun",
""
],
[
"Was",
"Z.",
""
]
] | In physics simulation chains, the PHOTOS Monte Carlo program is often used to simulate QED effects in decays of intermediate particles and resonances. The program is based on an exact multiphoton phase space. In general, the matrix element is obtained from iterations of a universal kernel and approximations are involved. To evaluate the program precision, it is necessary to formulate and implement within the generator the exact matrix element, which depends on the decay channel. Then, all terms necessary for non-leading logarithms are taken into account. In the present letter we focus on the decay K to pi l^pm nu_l and tests of the PHOTOS Monte Carlo program. We conclude a 0.2% relative precision in the implementation of the hard photon matrix element into the emission kernel, including the case where approximations are used. |
hep-ph/9907494 | Carlo Oleari | C. Anastasiou, E.W.N. Glover and C. Oleari | Scalar One-Loop Integrals using the Negative-Dimension Approach | 54 pages, 4 figures | Nucl.Phys.B572:307-360,2000 | 10.1016/S0550-3213(99)00637-9 | DTP/99/80 | hep-ph hep-th | null | We study massive one-loop integrals by analytically continuing the Feynman
integral to negative dimensions as advocated by Halliday and Ricotta and
developed by Suzuki and Schmidt. We consider n-point one-loop integrals with
arbitrary powers of propagators in general dimension D. For integrals with m
mass scales and q external momentum scales, we construct a template solution
valid for all n which allows us to obtain a representation of the graph in
terms of a finite sum of generalised hypergeometric functions with m+q-1
variables. All solutions for all possible kinematic regions are given
simultaneously, allowing the investigation of different ranges of variation of
mass and momentum scales.
As a first step, we develop the general framework and apply it to massive
bubble and vertex integrals. Of course many of these integrals are well known
and we show that the known results are recovered. To give a concrete new
result, we present expressions for the general vertex integral with one
off-shell leg and two internal masses in terms of hypergeometric functions of
two variables that converge in the appropriate kinematic regions. The kinematic
singularity structure of this graph is sufficiently complex to give insight
into how the negative-dimension method operates and gives some hope that more
complicated graphs can also be evaluated.
| [
{
"created": "Mon, 26 Jul 1999 14:48:09 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Anastasiou",
"C.",
""
],
[
"Glover",
"E. W. N.",
""
],
[
"Oleari",
"C.",
""
]
] | We study massive one-loop integrals by analytically continuing the Feynman integral to negative dimensions as advocated by Halliday and Ricotta and developed by Suzuki and Schmidt. We consider n-point one-loop integrals with arbitrary powers of propagators in general dimension D. For integrals with m mass scales and q external momentum scales, we construct a template solution valid for all n which allows us to obtain a representation of the graph in terms of a finite sum of generalised hypergeometric functions with m+q-1 variables. All solutions for all possible kinematic regions are given simultaneously, allowing the investigation of different ranges of variation of mass and momentum scales. As a first step, we develop the general framework and apply it to massive bubble and vertex integrals. Of course many of these integrals are well known and we show that the known results are recovered. To give a concrete new result, we present expressions for the general vertex integral with one off-shell leg and two internal masses in terms of hypergeometric functions of two variables that converge in the appropriate kinematic regions. The kinematic singularity structure of this graph is sufficiently complex to give insight into how the negative-dimension method operates and gives some hope that more complicated graphs can also be evaluated. |
1809.00997 | Arkady Vainshtein | Zurab Berezhiani and Arkady Vainshtein | Neutron--Antineutron Oscillations: Discrete Symmetries and Quark
Operators | 8 pages, 2 figures. arXiv admin note: text overlap with
arXiv:1506.05096 | null | 10.1016/j.physletb.2018.11.014 | null | hep-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We analyze status of ${\bf C}$, ${\bf P}$ and ${\bf T}$ discrete symmetries
in application to neutron-antineutron transitions breaking conservation of
baryon charge ${\cal B}$ by two units. At the level of free particles all these
symmetries are preserved. This includes ${\bf P}$ reflection in spite of the
opposite internal parities usually ascribed to neutron and antineutron.
Explanation, which goes back to the 1937 papers by E. Majorana and by G. Racah,
is based on a definition of parity satisfying ${\bf P}^{2}=-1$, instead of
${\bf P}^{2}=1$, and ascribing $ {\bf P}=i$ to both, neutron and antineutron.
We apply this to ${\bf C}$, ${\bf P}$ and ${\bf T}$ classification of six-quark
operators with $|\Delta {\cal B} |=2$. It allows to specify operators
contributing to neutron-antineutron oscillations. Remaining operators
contribute to other $|\Delta {\cal B} |=2$ processes and, in particular, to
nuclei instability. We also show that presence of external magnetic field does
not induce any new operator mixing the neutron and antineutron provided that
rotational invariance is not broken.
| [
{
"created": "Thu, 30 Aug 2018 19:59:57 GMT",
"version": "v1"
}
] | 2018-11-21 | [
[
"Berezhiani",
"Zurab",
""
],
[
"Vainshtein",
"Arkady",
""
]
] | We analyze status of ${\bf C}$, ${\bf P}$ and ${\bf T}$ discrete symmetries in application to neutron-antineutron transitions breaking conservation of baryon charge ${\cal B}$ by two units. At the level of free particles all these symmetries are preserved. This includes ${\bf P}$ reflection in spite of the opposite internal parities usually ascribed to neutron and antineutron. Explanation, which goes back to the 1937 papers by E. Majorana and by G. Racah, is based on a definition of parity satisfying ${\bf P}^{2}=-1$, instead of ${\bf P}^{2}=1$, and ascribing $ {\bf P}=i$ to both, neutron and antineutron. We apply this to ${\bf C}$, ${\bf P}$ and ${\bf T}$ classification of six-quark operators with $|\Delta {\cal B} |=2$. It allows to specify operators contributing to neutron-antineutron oscillations. Remaining operators contribute to other $|\Delta {\cal B} |=2$ processes and, in particular, to nuclei instability. We also show that presence of external magnetic field does not induce any new operator mixing the neutron and antineutron provided that rotational invariance is not broken. |
1408.0798 | Stefan Berge | Stefan Berge, Werner Bernreuther and Sebastian Kirchner | Determination of the Higgs CP mixing angle in the tau decay channels at
the LHC including the Drell-Yan background | 27 pages, 11 figures, 1 table; journal version | Eur.Phys.J. C74 (2014) 11, 3164 | 10.1140/epjc/s10052-014-3164-0 | TTK-14-14 | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We investigate how precisely the CP nature of the 125 GeV Higgs boson
resonance h can be unraveled at the LHC in its decays to tau pairs. We use a
method which allows to determine the scalar-pseudoscalar Higgs mixing angle in
this decay mode. This mixing angle can be extracted from the distribution of a
signed angle, which we analyze for the major charged-prong tau decays. For
definiteness, we consider Higgs-boson production by gluon fusion at NLO QCD. We
take into account also the irreducible background from Drell-Yan production at
NLO QCD. We compute, for the signal and background reactions, angular and
energy correlations of the charged prongs and analyze which type of cuts
suppress the Drell-Yan background. An important feature of this background is
that its contribution to the distribution of our observable is a flat line,
also at NLO QCD. By separating the Drell-Yan events into two different sets,
two different non-trivial distributions are obtained. Based on this observation
we propose to use these sets for calibation purposes. By Monte Carlo simulation
we study also the effect of measurement uncertainties on this distribution. We
estimate that the Higgs mixing angle can be determined with our method to a
precision of 14 degree (5 degree) at the high luminosity LHC (14 TeV) with an
integrated luminosity of 500 inverse fb (3 inverse ab).
| [
{
"created": "Mon, 4 Aug 2014 20:00:14 GMT",
"version": "v1"
},
{
"created": "Wed, 10 Dec 2014 14:32:58 GMT",
"version": "v2"
}
] | 2014-12-11 | [
[
"Berge",
"Stefan",
""
],
[
"Bernreuther",
"Werner",
""
],
[
"Kirchner",
"Sebastian",
""
]
] | We investigate how precisely the CP nature of the 125 GeV Higgs boson resonance h can be unraveled at the LHC in its decays to tau pairs. We use a method which allows to determine the scalar-pseudoscalar Higgs mixing angle in this decay mode. This mixing angle can be extracted from the distribution of a signed angle, which we analyze for the major charged-prong tau decays. For definiteness, we consider Higgs-boson production by gluon fusion at NLO QCD. We take into account also the irreducible background from Drell-Yan production at NLO QCD. We compute, for the signal and background reactions, angular and energy correlations of the charged prongs and analyze which type of cuts suppress the Drell-Yan background. An important feature of this background is that its contribution to the distribution of our observable is a flat line, also at NLO QCD. By separating the Drell-Yan events into two different sets, two different non-trivial distributions are obtained. Based on this observation we propose to use these sets for calibation purposes. By Monte Carlo simulation we study also the effect of measurement uncertainties on this distribution. We estimate that the Higgs mixing angle can be determined with our method to a precision of 14 degree (5 degree) at the high luminosity LHC (14 TeV) with an integrated luminosity of 500 inverse fb (3 inverse ab). |
1509.00073 | Hooman Davoudiasl | Hooman Davoudiasl | Implications of a Running Dark Photon Coupling | 4 pages, 4 figures. Contributed to the 11th Patras Workshop on
Axions, WIMPs and WISPs, Zaragoza, Spain, June 22-26, 2015 | null | null | null | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | For an "invisible" dark photon $Z_d$ that dominantly decays into dark states,
the running of its fine structure constant $\alpha_d$ with momentum transfer $q
> m_{Z_d}$ could be significant. A similar running in the kinetic mixing
parameter $\varepsilon^2$ can be induced through its dependence on
$\alpha_d(q)$. The running of couplings could potentially be detected in "dark
matter beam" experiments, for which theoretical considerations imply $\alpha_d
(m_{Z_d}) \lesssim 0.5$.
| [
{
"created": "Mon, 31 Aug 2015 21:10:24 GMT",
"version": "v1"
}
] | 2015-09-07 | [
[
"Davoudiasl",
"Hooman",
""
]
] | For an "invisible" dark photon $Z_d$ that dominantly decays into dark states, the running of its fine structure constant $\alpha_d$ with momentum transfer $q > m_{Z_d}$ could be significant. A similar running in the kinetic mixing parameter $\varepsilon^2$ can be induced through its dependence on $\alpha_d(q)$. The running of couplings could potentially be detected in "dark matter beam" experiments, for which theoretical considerations imply $\alpha_d (m_{Z_d}) \lesssim 0.5$. |
1111.6133 | Xiao-ping Wang | Xiao-ping Wang, Jia Xu, and Shou-hua Zhu | Four Jets as a Probe of O(100 GeV) Physics beyond Standard Model at
Hadron Colliders | 15 pages, 11figures and 2 tables | null | 10.1103/PhysRevD.85.115001 | null | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | O(100 GeV) physics beyond the standard model (BSM) could be overlooked
provided that it is hidden in the untouched Higgs sector or jets. The top quark
forward-backward asymmetry measurements and di-jet bump, which is observed in
the associated production with charged lepton plus missing energy (supposed
arising from W decay), may indicate the existence of a new color-octet
axial-vector Z_C with a mass about 145 GeV. Here Z_C only decays into two jets.
In this paper we investigated the possibility to discover Z_C pair via
analyzing the four jets as the final states, which are heavily polluted by huge
QCD background. Our simulation showed that, however, both Tevatron and LHC have
the excellent chance to discover Z_C through analyzing the four jets events in
the current accumulated data.
| [
{
"created": "Sat, 26 Nov 2011 04:18:54 GMT",
"version": "v1"
},
{
"created": "Tue, 6 Dec 2011 04:21:14 GMT",
"version": "v2"
},
{
"created": "Fri, 2 Mar 2012 06:18:12 GMT",
"version": "v3"
}
] | 2015-03-19 | [
[
"Wang",
"Xiao-ping",
""
],
[
"Xu",
"Jia",
""
],
[
"Zhu",
"Shou-hua",
""
]
] | O(100 GeV) physics beyond the standard model (BSM) could be overlooked provided that it is hidden in the untouched Higgs sector or jets. The top quark forward-backward asymmetry measurements and di-jet bump, which is observed in the associated production with charged lepton plus missing energy (supposed arising from W decay), may indicate the existence of a new color-octet axial-vector Z_C with a mass about 145 GeV. Here Z_C only decays into two jets. In this paper we investigated the possibility to discover Z_C pair via analyzing the four jets as the final states, which are heavily polluted by huge QCD background. Our simulation showed that, however, both Tevatron and LHC have the excellent chance to discover Z_C through analyzing the four jets events in the current accumulated data. |
1304.1714 | Rikard Enberg | Rikard Enberg, Johan Rathsman, Glenn Wouda | Higgs properties in a broken Inert Doublet Model | 12 pages, 3 figures. Updated to include contents of Erratum.
Arguments about Z2 breaking revised, results unchanged | JHEP08 (2013) 079 | 10.1007/JHEP08(2013)079 | LU-TP 13-12 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We consider a model for the Higgs sector with two scalar doublets and a
broken $Z_2$ symmetry, the Stealth Doublet Model, where the $Z_2$ symmetry is
manifest in the Yukawa sector but broken by the scalar potential. This model
can be seen as a generalization of the Inert Doublet Model. One of the doublets
is the Higgs doublet that participates in electroweak symmetry breaking and
couples to fermions. The other doublet does not couple to fermions at tree
level and does not acquire a vacuum expectation value. The broken $Z_2$
symmetry leads to interesting phenomenology such as mixing between the two
doublets and charged and CP-odd scalars that can be light and have unusual
decay channels. We present theoretical and experimental constraints on the
model and consider the recent observation of a Higgs boson at the LHC. The data
on the $H\to\gamma\gamma$ channel can be naturally accommodated in the model,
with either the lightest or the heaviest CP-even scalar playing the role of the
observed particle.
| [
{
"created": "Fri, 5 Apr 2013 13:55:45 GMT",
"version": "v1"
},
{
"created": "Mon, 22 Dec 2014 22:15:42 GMT",
"version": "v2"
}
] | 2014-12-24 | [
[
"Enberg",
"Rikard",
""
],
[
"Rathsman",
"Johan",
""
],
[
"Wouda",
"Glenn",
""
]
] | We consider a model for the Higgs sector with two scalar doublets and a broken $Z_2$ symmetry, the Stealth Doublet Model, where the $Z_2$ symmetry is manifest in the Yukawa sector but broken by the scalar potential. This model can be seen as a generalization of the Inert Doublet Model. One of the doublets is the Higgs doublet that participates in electroweak symmetry breaking and couples to fermions. The other doublet does not couple to fermions at tree level and does not acquire a vacuum expectation value. The broken $Z_2$ symmetry leads to interesting phenomenology such as mixing between the two doublets and charged and CP-odd scalars that can be light and have unusual decay channels. We present theoretical and experimental constraints on the model and consider the recent observation of a Higgs boson at the LHC. The data on the $H\to\gamma\gamma$ channel can be naturally accommodated in the model, with either the lightest or the heaviest CP-even scalar playing the role of the observed particle. |
1411.1476 | Chien Yeah Seng | Chien-Yeah Seng | Reexamination of The Standard Model Nucleon Electric Dipole Moment | 21 pages, 4 figures | Phys. Rev. C 91, 025502 (2015) | 10.1103/PhysRevC.91.025502 | null | hep-ph nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The Cabibbo-Kobayashi-Maskawa matrix in the Standard Model is currently the
only experimentally-confirmed source of CP-violation. The intrinsic electric
dipole moment of the nucleon induced by this CP-phase via hadronic loop and
pole diagrams has been studied more than two decades ago, but the existing
calculation is subject to various theoretical issues such as the breakdown of
chiral power counting and uncertainties in the determination of low energy
constants. We carry out an up-to-date re-analysis on both one-loop and pole
diagram contributions to the nucleon electric dipole moment based on Heavy
Baryon Chiral Perturbation Theory in a way that preserves power counting, and
redo the determination of the low energy constants following the results of
more recent articles. Combined with an estimation of higher-order
contributions, we expect the long-distance contribution to the Standard Model
nucleon electric dipole moment to be approximately
$(1\times10^{-32}-6\times10^{-32})e\,\mathrm{cm}$.
| [
{
"created": "Thu, 6 Nov 2014 02:36:13 GMT",
"version": "v1"
},
{
"created": "Fri, 6 Feb 2015 16:46:34 GMT",
"version": "v2"
}
] | 2015-03-05 | [
[
"Seng",
"Chien-Yeah",
""
]
] | The Cabibbo-Kobayashi-Maskawa matrix in the Standard Model is currently the only experimentally-confirmed source of CP-violation. The intrinsic electric dipole moment of the nucleon induced by this CP-phase via hadronic loop and pole diagrams has been studied more than two decades ago, but the existing calculation is subject to various theoretical issues such as the breakdown of chiral power counting and uncertainties in the determination of low energy constants. We carry out an up-to-date re-analysis on both one-loop and pole diagram contributions to the nucleon electric dipole moment based on Heavy Baryon Chiral Perturbation Theory in a way that preserves power counting, and redo the determination of the low energy constants following the results of more recent articles. Combined with an estimation of higher-order contributions, we expect the long-distance contribution to the Standard Model nucleon electric dipole moment to be approximately $(1\times10^{-32}-6\times10^{-32})e\,\mathrm{cm}$. |
2105.06879 | Chris Hays | Rodrigo Alonso, Cristofero Fraser-Taliente, Chris Hays, Michael
Spannowsky | Prospects for direct CP tests of $hqq$ interactions | 19 pages, 4 figures | null | 10.1007/JHEP08(2021)167 | null | hep-ph | http://creativecommons.org/licenses/by/4.0/ | We study the prospects for probing the CP structure of $hqq$ interactions
using the decays of the lightest baryon $\Lambda_q$ formed in the quark's
hadronization. The low yields of reconstructible events make it unlikely for
tests to be performed with the next generation of colliders. In $h\to b\bar
b\to \Lambda_b \bar\Lambda_b$ decays a CP-sensitive distribution could be
measured with a high-luminosity $e^+ e^-$ collider, while in both $h\to b\bar
b\to \Lambda_b \bar\Lambda_b$ and $h\to c\bar c\to \Lambda_c \bar\Lambda_c$
decays such a distribution could be measured with a very high luminosity $\mu^+
\mu^-$ collider. However, we find that only the $\mu^+ \mu^-$ collider can
produce enough $h\to b\bar b\to \Lambda_b \bar\Lambda_b$ decays to probe a
physical CP asymmetry in the $hbb$ vertex.
| [
{
"created": "Fri, 14 May 2021 15:06:52 GMT",
"version": "v1"
},
{
"created": "Wed, 22 Sep 2021 15:15:09 GMT",
"version": "v2"
}
] | 2021-09-23 | [
[
"Alonso",
"Rodrigo",
""
],
[
"Fraser-Taliente",
"Cristofero",
""
],
[
"Hays",
"Chris",
""
],
[
"Spannowsky",
"Michael",
""
]
] | We study the prospects for probing the CP structure of $hqq$ interactions using the decays of the lightest baryon $\Lambda_q$ formed in the quark's hadronization. The low yields of reconstructible events make it unlikely for tests to be performed with the next generation of colliders. In $h\to b\bar b\to \Lambda_b \bar\Lambda_b$ decays a CP-sensitive distribution could be measured with a high-luminosity $e^+ e^-$ collider, while in both $h\to b\bar b\to \Lambda_b \bar\Lambda_b$ and $h\to c\bar c\to \Lambda_c \bar\Lambda_c$ decays such a distribution could be measured with a very high luminosity $\mu^+ \mu^-$ collider. However, we find that only the $\mu^+ \mu^-$ collider can produce enough $h\to b\bar b\to \Lambda_b \bar\Lambda_b$ decays to probe a physical CP asymmetry in the $hbb$ vertex. |
hep-ph/0607027 | Roldao da Rocha | Roldao da Rocha and Carlos H. Coimbra-Araujo | Extra dimensions in CERN LHC via mini-black holes: effective Kerr-Newman
brane-world effects | 11 pages, 23 figures, citations updated | Phys.Rev.D74:055006,2006 | 10.1103/PhysRevD.74.055006 | null | hep-ph | null | We solve Einstein equations on the brane to derive the exact form of the
braneworld-corrected perturbations in Kerr-Newman singularities, using
Randall-Sundrum and Arkani-Hamed-Dimopoulos-Dvali (ADD) models. It is a
consequence of such models the possibility that Kerr-Newman mini-black holes
can be produced in LHC. We use this approach to derive a normalized correction
for the Schwarzschild Myers-Perry radius of a static $(4+n)$-dimensional
mini-black hole, using more realistic approaches arising from Kerr-Newman
mini-black hole analysis. Besides, we prove that there are four Kerr-Newman
black hole horizons in braneworld scenario we use, although only the outer
horizon is relevant in the physical measurable processes. Parton cross sections
in LHC and Hawking temperature are also investigated as functions of Planck
mass (in the LHC range 1-10 TeV), mini-black hole mass and the number of large
extra dimensions in braneworld large extra-dimensional scenarios. In this case
a more realistic brane effect-corrected formalism can achieve more precisely
the effective extra-dimensional Planck mass and the number of large extra
dimensions -- in Arkani-Hamed-Dimopoulos-Dvali model -- or the size of the
warped extra dimension -- in Randall-Sundrum formalism.
| [
{
"created": "Mon, 3 Jul 2006 21:13:48 GMT",
"version": "v1"
},
{
"created": "Wed, 5 Jul 2006 02:46:35 GMT",
"version": "v2"
},
{
"created": "Thu, 12 Oct 2006 22:24:56 GMT",
"version": "v3"
}
] | 2014-11-18 | [
[
"da Rocha",
"Roldao",
""
],
[
"Coimbra-Araujo",
"Carlos H.",
""
]
] | We solve Einstein equations on the brane to derive the exact form of the braneworld-corrected perturbations in Kerr-Newman singularities, using Randall-Sundrum and Arkani-Hamed-Dimopoulos-Dvali (ADD) models. It is a consequence of such models the possibility that Kerr-Newman mini-black holes can be produced in LHC. We use this approach to derive a normalized correction for the Schwarzschild Myers-Perry radius of a static $(4+n)$-dimensional mini-black hole, using more realistic approaches arising from Kerr-Newman mini-black hole analysis. Besides, we prove that there are four Kerr-Newman black hole horizons in braneworld scenario we use, although only the outer horizon is relevant in the physical measurable processes. Parton cross sections in LHC and Hawking temperature are also investigated as functions of Planck mass (in the LHC range 1-10 TeV), mini-black hole mass and the number of large extra dimensions in braneworld large extra-dimensional scenarios. In this case a more realistic brane effect-corrected formalism can achieve more precisely the effective extra-dimensional Planck mass and the number of large extra dimensions -- in Arkani-Hamed-Dimopoulos-Dvali model -- or the size of the warped extra dimension -- in Randall-Sundrum formalism. |
hep-ph/0211373 | Laura Reina | S. Dawson (BNL), L.H. Orr (Rochester U.), L. Reina (FSU), D. Wackeroth
(SUNY, Buffalo) | NLO QCD Predictions for associated t-tbar-h production in Hadronic
Collisions | LaTeX, 5 pages, 6 figures, talk given by L.R. at RADCOR2002/Loops and
Legs, Kloster Banz, Germany, Sep. 2002, to appear in the Proceedings | Nucl.Phys.Proc.Suppl. 116 (2003) 207 | 10.1016/S0920-5632(03)80171-8 | BNL-HET-02/27, FSU-HEP-2002-1123, UB-HET-02-10 | hep-ph | null | We present the next-to-leading-order (NLO) QCD corrections to the inclusive
total cross section for the production of a Higgs boson in association with a
top anti-top quark pair within the Standard Model at the Tevatron and the LHC.
| [
{
"created": "Sun, 24 Nov 2002 21:36:11 GMT",
"version": "v1"
}
] | 2009-11-07 | [
[
"Dawson",
"S.",
"",
"BNL"
],
[
"Orr",
"L. H.",
"",
"Rochester U."
],
[
"Reina",
"L.",
"",
"FSU"
],
[
"Wackeroth",
"D.",
"",
"SUNY, Buffalo"
]
] | We present the next-to-leading-order (NLO) QCD corrections to the inclusive total cross section for the production of a Higgs boson in association with a top anti-top quark pair within the Standard Model at the Tevatron and the LHC. |
0803.4104 | Alexander Andrianov A | A.A.Andrianov, D.Espriu | Parity doubling from Weinberg sum rules | 4 pages | Phys.Lett.B671:275-279,2009 | 10.1016/j.physletb.2008.12.030 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We investigate the relation among slopes and intercepts of Regge trajectories
for mesons of a given spin and different parities using large N_c arguments and
the matching to perturbative QCD in the deep-Minkowski region. For spin-1
mesons of opposite parities we prove that: a) for large and increasing N_c, the
scale \Lambda^{(V,A)} separating the resonance-dominated and the
perturbative-saturated region in the channels V,A grows as \sqrt{N_c}; b) to
satisfy the Weinberg sum rules the slopes of Regge trajectories for mesons of
opposite parities must coincide; c) their intercepts may differ and their
difference corresponds to the difference between \Lambda^V and \Lambda^A. Some
arguments indicate that this difference should tend to zero as N_c\to\infty.
| [
{
"created": "Fri, 28 Mar 2008 12:47:52 GMT",
"version": "v1"
}
] | 2009-01-25 | [
[
"Andrianov",
"A. A.",
""
],
[
"Espriu",
"D.",
""
]
] | We investigate the relation among slopes and intercepts of Regge trajectories for mesons of a given spin and different parities using large N_c arguments and the matching to perturbative QCD in the deep-Minkowski region. For spin-1 mesons of opposite parities we prove that: a) for large and increasing N_c, the scale \Lambda^{(V,A)} separating the resonance-dominated and the perturbative-saturated region in the channels V,A grows as \sqrt{N_c}; b) to satisfy the Weinberg sum rules the slopes of Regge trajectories for mesons of opposite parities must coincide; c) their intercepts may differ and their difference corresponds to the difference between \Lambda^V and \Lambda^A. Some arguments indicate that this difference should tend to zero as N_c\to\infty. |
1207.5499 | Neal Weiner | Daniele S. M. Alves, Patrick J. Fox and Neal J. Weiner | Higgs Signals in a Type I 2HDM or with a Sister Higgs | 15 pages, 4 figures | null | null | FERMILAB-PUB-12-401-T} | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In models where an additional SU(2)-doublet that does not have couplings to
fermions participates in electroweak symmetry breaking, the properties of the
Higgs boson are changed. At tree level, in the neighborhood of the SM-like
range of parameter space, it is natural to have the coupling to vectors, cV,
approximately constant, while the coupling to fermions, cf, is suppressed. This
leads to enhanced VBF signals of gamma gamma while keeping other signals of
Higgses approximately constant (such as WW* and ZZ*), and suppressing higgs to
tau tau. Sizable tree-level effects are often accompanied by light charged
Higgs states, which lead to important constraints from b to s gamma and top to
b H+, but also often to similarly sizable contributions to the inclusive h to
gamma gamma signal from radiative effects. In the simplest model, this is
described by a Type I 2HDM, and in supersymmetry is naturally realized with
"sister Higgs" fields. In such a scenario, additional light charged states can
contribute further with fewer constraints from heavy flavor decays. With
supersymmetry, Grand Unification motivates the inclusion of colored partner
fields. These G-quarks may provide additional evidence for such a model.
| [
{
"created": "Mon, 23 Jul 2012 19:55:58 GMT",
"version": "v1"
}
] | 2012-07-24 | [
[
"Alves",
"Daniele S. M.",
""
],
[
"Fox",
"Patrick J.",
""
],
[
"Weiner",
"Neal J.",
""
]
] | In models where an additional SU(2)-doublet that does not have couplings to fermions participates in electroweak symmetry breaking, the properties of the Higgs boson are changed. At tree level, in the neighborhood of the SM-like range of parameter space, it is natural to have the coupling to vectors, cV, approximately constant, while the coupling to fermions, cf, is suppressed. This leads to enhanced VBF signals of gamma gamma while keeping other signals of Higgses approximately constant (such as WW* and ZZ*), and suppressing higgs to tau tau. Sizable tree-level effects are often accompanied by light charged Higgs states, which lead to important constraints from b to s gamma and top to b H+, but also often to similarly sizable contributions to the inclusive h to gamma gamma signal from radiative effects. In the simplest model, this is described by a Type I 2HDM, and in supersymmetry is naturally realized with "sister Higgs" fields. In such a scenario, additional light charged states can contribute further with fewer constraints from heavy flavor decays. With supersymmetry, Grand Unification motivates the inclusion of colored partner fields. These G-quarks may provide additional evidence for such a model. |
hep-ph/0201275 | Thomas G. Rizzo | J.L. Hewett, F.J. Petriello and T.G. Rizzo | Signals for Noncommutative QED at High Energy $e^+e^-$ Colliders | 4 pages, 4 figs, LaTex; Contributed to Snowmass 2001 Summer Study | eConf C010630 (2001) E3064 | null | SLAC-PUB-9129 | hep-ph | null | We examine the signatures for noncommutative QED at $e^+e^-$ colliders with
center of mass energies in excess of 1 TeV such as CLIC. For integrated
luminosities of 1 ab$^{-1}$ or more, sensitivities to the associated mass
scales greater than $\sqrt s$ are possible.
| [
{
"created": "Tue, 29 Jan 2002 23:28:45 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Hewett",
"J. L.",
""
],
[
"Petriello",
"F. J.",
""
],
[
"Rizzo",
"T. G.",
""
]
] | We examine the signatures for noncommutative QED at $e^+e^-$ colliders with center of mass energies in excess of 1 TeV such as CLIC. For integrated luminosities of 1 ab$^{-1}$ or more, sensitivities to the associated mass scales greater than $\sqrt s$ are possible. |
1407.5164 | Einan Gardi | Einan Gardi | Infrared singularities in multi-leg scattering amplitudes | 16 page, 5 figures | null | null | Edinburgh 2014/13 | hep-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | I discuss the state-of-the-art knowledge of long-distance singularities in
multi-leg gauge-theory scattering amplitudes and report on an on-going
calculation of the three-loop soft anomalous dimension through the
renormalization of correlators of semi-infinite Wilson lines. I also discuss
the non-Abelian exponentiation theorem that has been recently generalised to
multiple Wilson lines and demonstrate its application in computing the soft
anomalous dimension. Finally, I present recent results for
multiple-gluon-exchange webs and discuss their analytic structure.
| [
{
"created": "Sat, 19 Jul 2014 09:08:25 GMT",
"version": "v1"
}
] | 2014-07-22 | [
[
"Gardi",
"Einan",
""
]
] | I discuss the state-of-the-art knowledge of long-distance singularities in multi-leg gauge-theory scattering amplitudes and report on an on-going calculation of the three-loop soft anomalous dimension through the renormalization of correlators of semi-infinite Wilson lines. I also discuss the non-Abelian exponentiation theorem that has been recently generalised to multiple Wilson lines and demonstrate its application in computing the soft anomalous dimension. Finally, I present recent results for multiple-gluon-exchange webs and discuss their analytic structure. |
1502.00508 | Zhao-Feng Kang | Jun Guo, Zhaofeng Kang, P. Ko and Yuta Orikasa | Accidental Dark Matter: Case in the Scale Invariant Local $B-L$ Models | Journal version, including more remarks in particular about the the
condition for the accidental Z2 surviving; 29 pages | Phys. Rev. D 91, 115017 (2015) | 10.1103/PhysRevD.91.115017 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We explore the idea of accidental dark matter (aDM) stability in the scale
invariant local $U(1)_{B-L}$ model, which is a theory for neutrino and at the
same time radiatively breaks scale invariance via quantum mechanical dynamics
in the $U(1)_{B-L}$ sector. A real singlet scalar can be accidental DM with an
accidental $Z_2$, by virtue of both extended symmetries. A $U(1)_{B-L}$ charged
complex scalar can also be a viable accidental DM due to an accidental (or
remanent) $Z_3$. They can reproduce correct relic density via the annihilations
through the conventional Higgs portal or dark Higgs portal. The dark Higgs
portal scenario is in tension with the LHC bound on $Z_{B-L}$, and only heavy
DM of a few TeVs can have correct relic density. In particular, DM may trigger
spontaneous breaking of scale Invariance (SISB). The situation is relaxed
significantly in the $Z_3$ case due to the effective semi-annihilation mode and
then light DM can be accommodated easily. In addition, the $Z_3$ model can
accommodate the GeV scale $\gamma-$ray excess from the galactic center (GC) via
semi-annihilation into pseudo Goldstone boson (PGSB). The best fit is achieved
at a DM about 52 GeV, with annihilation cross section consistent with the
thermal relic density. The invisible Higgs branching ratio is negligible
because the Higgs portal quartic coupling is very small $\lambda_{h\phi}
\lesssim 10^{-3}$.
| [
{
"created": "Mon, 2 Feb 2015 15:22:17 GMT",
"version": "v1"
},
{
"created": "Sat, 7 Feb 2015 15:15:00 GMT",
"version": "v2"
},
{
"created": "Sun, 2 Aug 2015 08:09:24 GMT",
"version": "v3"
}
] | 2015-08-04 | [
[
"Guo",
"Jun",
""
],
[
"Kang",
"Zhaofeng",
""
],
[
"Ko",
"P.",
""
],
[
"Orikasa",
"Yuta",
""
]
] | We explore the idea of accidental dark matter (aDM) stability in the scale invariant local $U(1)_{B-L}$ model, which is a theory for neutrino and at the same time radiatively breaks scale invariance via quantum mechanical dynamics in the $U(1)_{B-L}$ sector. A real singlet scalar can be accidental DM with an accidental $Z_2$, by virtue of both extended symmetries. A $U(1)_{B-L}$ charged complex scalar can also be a viable accidental DM due to an accidental (or remanent) $Z_3$. They can reproduce correct relic density via the annihilations through the conventional Higgs portal or dark Higgs portal. The dark Higgs portal scenario is in tension with the LHC bound on $Z_{B-L}$, and only heavy DM of a few TeVs can have correct relic density. In particular, DM may trigger spontaneous breaking of scale Invariance (SISB). The situation is relaxed significantly in the $Z_3$ case due to the effective semi-annihilation mode and then light DM can be accommodated easily. In addition, the $Z_3$ model can accommodate the GeV scale $\gamma-$ray excess from the galactic center (GC) via semi-annihilation into pseudo Goldstone boson (PGSB). The best fit is achieved at a DM about 52 GeV, with annihilation cross section consistent with the thermal relic density. The invisible Higgs branching ratio is negligible because the Higgs portal quartic coupling is very small $\lambda_{h\phi} \lesssim 10^{-3}$. |
hep-ph/9407383 | Mr. Kenton K. Yee | Ken Yee | Abelian Action for Quark Confinement: A Direct Evaluation | 8 pages, LSU-0725-94, inserted missing Faddeev-Popov determinants | null | null | null | hep-ph hep-lat | null | We evaluate S_{APQCD}, the Abelian projection QCD(APQCD) action
nonperturbatively on the lattice. For SU(2), we find S_{APQCD} at strong
coupling is essentially the compact QED(CQED) action. At weaker coupling, we
find S_{APQCD} mutates: it gains additional operators, including an exogenous
NEGATIVE magnetic monopole mass shift. As a corollary, since monopoles are
condensed in CQED our results prove (vicariously) that SU(2) monopoles are
condensed. S_{APQCD} for SU(3) has similar behavior.
| [
{
"created": "Wed, 27 Jul 1994 01:02:05 GMT",
"version": "v1"
},
{
"created": "Thu, 25 Aug 1994 20:06:01 GMT",
"version": "v2"
}
] | 2016-09-01 | [
[
"Yee",
"Ken",
""
]
] | We evaluate S_{APQCD}, the Abelian projection QCD(APQCD) action nonperturbatively on the lattice. For SU(2), we find S_{APQCD} at strong coupling is essentially the compact QED(CQED) action. At weaker coupling, we find S_{APQCD} mutates: it gains additional operators, including an exogenous NEGATIVE magnetic monopole mass shift. As a corollary, since monopoles are condensed in CQED our results prove (vicariously) that SU(2) monopoles are condensed. S_{APQCD} for SU(3) has similar behavior. |
2202.03191 | Fei Gao | Fei Gao, Minghui Ding, Yuxin Liu, Sebastian M. Schmidt | A correspondence between the free and interacting field theories | 7 pages, 1 figure | null | 10.1140/epjc/s10052-023-11278-4 | null | hep-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We discover a correspondence between the free field and the interacting
states. This correspondence is firstly given from the fact that the free
propagator can be converted into a tower of propagators for massive states,
when expanded with the Hermite function basis. The equivalence of propagators
reveals that in this particular case the duality can naturally be regarded as
the equivalence of one theory on the plane wave basis to the other on the
Hermite function basis. More generally, the Hermite function basis provides an
alternative quantization process with the creation/annihilation operators that
correspond directly to the interacting fields. Moreover, the Hermite function
basis defines an exact way of dimensional reduction. As an illustration, we
apply this basis on 3+1 dimensional Yang-Mills theory with three dimensional
space being reduced through the Hermite function basis, and if with only the
lowest order Hermite function, the equivalent action becomes the
Banks-Fischler-Shenker-Susskind (BFSS) matrix model.
| [
{
"created": "Fri, 4 Feb 2022 02:28:32 GMT",
"version": "v1"
}
] | 2023-03-01 | [
[
"Gao",
"Fei",
""
],
[
"Ding",
"Minghui",
""
],
[
"Liu",
"Yuxin",
""
],
[
"Schmidt",
"Sebastian M.",
""
]
] | We discover a correspondence between the free field and the interacting states. This correspondence is firstly given from the fact that the free propagator can be converted into a tower of propagators for massive states, when expanded with the Hermite function basis. The equivalence of propagators reveals that in this particular case the duality can naturally be regarded as the equivalence of one theory on the plane wave basis to the other on the Hermite function basis. More generally, the Hermite function basis provides an alternative quantization process with the creation/annihilation operators that correspond directly to the interacting fields. Moreover, the Hermite function basis defines an exact way of dimensional reduction. As an illustration, we apply this basis on 3+1 dimensional Yang-Mills theory with three dimensional space being reduced through the Hermite function basis, and if with only the lowest order Hermite function, the equivalent action becomes the Banks-Fischler-Shenker-Susskind (BFSS) matrix model. |
1911.01604 | Mauro Napsuciale | H. Hernandez-Arellano, M. Napsuciale and S. Rodriguez | Spin-one dark matter and gamma ray signals from the galactic center | 24 pages, new sections added, version to appear in JHEP | null | null | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this work we study the possibility that the gamma ray excess (GRE) at the
Milky Way galactic center come from the annihilation of dark matter with a
$(1,0)\oplus(0,1)$ space-time structure (spin-one dark matter, SODM). We
calculate the production of prompt photons from initial state radiation,
internal bremsstrahlung, final state radiation including the emission from the
decay products of the $\mu, \tau$ or hadronization of quarks. Next we study the
delayed photon emission from the inverse Compton scattering (ICS) of electrons
(produced directly or in the prompt decay of $\mu, \tau$ leptons or in the
hadronization of quarks produced in the annihilation of SODM) with the cosmic
microwave background or starlight. All these mechanisms yield significant
contributions only for Higgs resonant exchange, i.e. for $M\approx M_{H}/2$,
and the results depend on the Higgs scalar coupling to SODM, $g_{s}$. The
dominant mechanism at the GRE bump is the prompt photon production in the
hadronization of $b$ quarks produced in $\bar{D}D\to \bar{b}b$, whereas the
delayed photon emission from the ICS of electrons coming from the hadronization
of $b$ quarks produced in the same reaction dominates at low energies ($\omega
< 0.3~ GeV$) and prompt photons from $c$ and $\tau$, as well as from internal
bremsstrahlung, yield competitive contributions at the end point of the
spectrum ($\omega \ge 30 ~GeV$). Taking into account all these contributions,
our results for photons produced in the annihilation of SODM are in good
agreement with the GRE data for $g_{s}\in [0.98, 1.01] \times 10^{-3}$ and
$M\in [62.470,62.505]~GeV$.
| [
{
"created": "Tue, 5 Nov 2019 03:57:03 GMT",
"version": "v1"
},
{
"created": "Sun, 16 Feb 2020 14:00:51 GMT",
"version": "v2"
},
{
"created": "Sun, 26 Jul 2020 02:58:39 GMT",
"version": "v3"
}
] | 2020-07-28 | [
[
"Hernandez-Arellano",
"H.",
""
],
[
"Napsuciale",
"M.",
""
],
[
"Rodriguez",
"S.",
""
]
] | In this work we study the possibility that the gamma ray excess (GRE) at the Milky Way galactic center come from the annihilation of dark matter with a $(1,0)\oplus(0,1)$ space-time structure (spin-one dark matter, SODM). We calculate the production of prompt photons from initial state radiation, internal bremsstrahlung, final state radiation including the emission from the decay products of the $\mu, \tau$ or hadronization of quarks. Next we study the delayed photon emission from the inverse Compton scattering (ICS) of electrons (produced directly or in the prompt decay of $\mu, \tau$ leptons or in the hadronization of quarks produced in the annihilation of SODM) with the cosmic microwave background or starlight. All these mechanisms yield significant contributions only for Higgs resonant exchange, i.e. for $M\approx M_{H}/2$, and the results depend on the Higgs scalar coupling to SODM, $g_{s}$. The dominant mechanism at the GRE bump is the prompt photon production in the hadronization of $b$ quarks produced in $\bar{D}D\to \bar{b}b$, whereas the delayed photon emission from the ICS of electrons coming from the hadronization of $b$ quarks produced in the same reaction dominates at low energies ($\omega < 0.3~ GeV$) and prompt photons from $c$ and $\tau$, as well as from internal bremsstrahlung, yield competitive contributions at the end point of the spectrum ($\omega \ge 30 ~GeV$). Taking into account all these contributions, our results for photons produced in the annihilation of SODM are in good agreement with the GRE data for $g_{s}\in [0.98, 1.01] \times 10^{-3}$ and $M\in [62.470,62.505]~GeV$. |
1409.2496 | Dmitri Kharzeev | Dmitri E. Kharzeev | Deconfinement as an entropic self-destruction: a solution for the
quarkonium suppression puzzle? | a slightly extended version to appear in Phys Rev D; 6 pages, 3
figures | Phys. Rev. D 90, 074007 (2014) | 10.1103/PhysRevD.90.074007 | null | hep-ph hep-th nucl-ex nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The entropic approach to dissociation of bound states immersed in strongly
coupled systems is developed. In such systems, the excitations of the bound
state are often delocalized and characterized by a large entropy, so that the
bound state is strongly entangled with the rest of the statistical system. If
this entropy $S$ increases with the separation $r$ between the constituents of
the bound state, $S = S(r)$, then the resulting entropic force $F = T\
{\partial S}/{\partial r}$ ($T$ is temperature) can drive the dissociation
process. As a specific example, we consider the case of heavy quarkonium in
strongly coupled quark-gluon plasma, where lattice QCD indicates a large amount
of entropy associated with the heavy quark pair at temperatures $0.9\ T_c \leq
T \leq 1.5\ T_c$ ($T_c$ is the deconfinement temperature); this entropy $S(r)$
grows with the inter-quark distance $r$. We argue that the entropic mechanism
results in an anomalously strong quarkonium suppression in the temperature
range near $T_c$. This "entropic self-destruction" may thus explain why the
experimentally measured quarkonium nuclear modification factor at RHIC (lower
energy density) is smaller than at LHC (higher energy density), possibly
resolving the "quarkonium suppression puzzle" - all of the previously known
mechanisms of quarkonium dissociation operate more effectively at higher energy
densities, and this contradicts the data. Moreover, we find that near $T_c$ the
entropic force leads to delocalization of the bound hadron states; we argue
that this delocalization may be the mechanism underlying deconfinement.
| [
{
"created": "Mon, 8 Sep 2014 20:00:11 GMT",
"version": "v1"
},
{
"created": "Wed, 17 Sep 2014 15:42:47 GMT",
"version": "v2"
}
] | 2014-10-08 | [
[
"Kharzeev",
"Dmitri E.",
""
]
] | The entropic approach to dissociation of bound states immersed in strongly coupled systems is developed. In such systems, the excitations of the bound state are often delocalized and characterized by a large entropy, so that the bound state is strongly entangled with the rest of the statistical system. If this entropy $S$ increases with the separation $r$ between the constituents of the bound state, $S = S(r)$, then the resulting entropic force $F = T\ {\partial S}/{\partial r}$ ($T$ is temperature) can drive the dissociation process. As a specific example, we consider the case of heavy quarkonium in strongly coupled quark-gluon plasma, where lattice QCD indicates a large amount of entropy associated with the heavy quark pair at temperatures $0.9\ T_c \leq T \leq 1.5\ T_c$ ($T_c$ is the deconfinement temperature); this entropy $S(r)$ grows with the inter-quark distance $r$. We argue that the entropic mechanism results in an anomalously strong quarkonium suppression in the temperature range near $T_c$. This "entropic self-destruction" may thus explain why the experimentally measured quarkonium nuclear modification factor at RHIC (lower energy density) is smaller than at LHC (higher energy density), possibly resolving the "quarkonium suppression puzzle" - all of the previously known mechanisms of quarkonium dissociation operate more effectively at higher energy densities, and this contradicts the data. Moreover, we find that near $T_c$ the entropic force leads to delocalization of the bound hadron states; we argue that this delocalization may be the mechanism underlying deconfinement. |
1509.04245 | Volodymyr Shapoval | V. M. Shapoval, Yu. M. Sinyukov, and V. Yu. Naboka | Proton-lambda correlation functions at the LHC with account for residual
correlations | 13 pages, 5 figures | Phys. Rev. C 92, 044910 (2015) | 10.1103/PhysRevC.92.044910 | null | hep-ph hep-ex nucl-ex nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The theoretical analysis of $\bar{p}-\Lambda \oplus p-\bar{\Lambda}$
correlation function in 10% most central Au+Au collisions at RHIC energy
$\sqrt{s_{NN}}=200$ GeV shows that the contribution of residual correlations is
the necessary factor to obtain a satisfactory description of the experimental
data. A neglecting of the residual correlation effect, leads to unrealistically
low source radius, about 2 times smaller than the corresponding value for
$p-\Lambda \oplus \bar{p}-\bar{\Lambda}$ case, when one fits the experimental
correlation function within Lednicky-Lyuboshitz analytical model. Recently an
approach accounting effectively for residual correlations for the
baryon-antibaryon correlation function was proposed, and a good RHIC data
description was reached with the source radius extracted from the hydrokinetic
model (HKM). The $\bar{p}-\Lambda$ scattering length, as well as the parameters
characterizing the residual correlation effect --- annihilation dip amplitude
and its inverse width --- were extracted from the corresponding fit. In this
paper we use these extracted values and simulated in HKM source functions for
Pb+Pb collisions at the LHC energy $\sqrt{s_{NN}}=2.76$ TeV to predict the
corresponding $p\Lambda$ and $p\bar{\Lambda}$ correlation functions.
| [
{
"created": "Mon, 14 Sep 2015 19:14:44 GMT",
"version": "v1"
}
] | 2015-10-28 | [
[
"Shapoval",
"V. M.",
""
],
[
"Sinyukov",
"Yu. M.",
""
],
[
"Naboka",
"V. Yu.",
""
]
] | The theoretical analysis of $\bar{p}-\Lambda \oplus p-\bar{\Lambda}$ correlation function in 10% most central Au+Au collisions at RHIC energy $\sqrt{s_{NN}}=200$ GeV shows that the contribution of residual correlations is the necessary factor to obtain a satisfactory description of the experimental data. A neglecting of the residual correlation effect, leads to unrealistically low source radius, about 2 times smaller than the corresponding value for $p-\Lambda \oplus \bar{p}-\bar{\Lambda}$ case, when one fits the experimental correlation function within Lednicky-Lyuboshitz analytical model. Recently an approach accounting effectively for residual correlations for the baryon-antibaryon correlation function was proposed, and a good RHIC data description was reached with the source radius extracted from the hydrokinetic model (HKM). The $\bar{p}-\Lambda$ scattering length, as well as the parameters characterizing the residual correlation effect --- annihilation dip amplitude and its inverse width --- were extracted from the corresponding fit. In this paper we use these extracted values and simulated in HKM source functions for Pb+Pb collisions at the LHC energy $\sqrt{s_{NN}}=2.76$ TeV to predict the corresponding $p\Lambda$ and $p\bar{\Lambda}$ correlation functions. |
0807.1792 | Charanjit S. Aulakh | Charanjit S. Aulakh | Babel on the Petaplex site: On Rival Calculational methods in SO(10)
MSGUTs | 12 pages,Latex. Comments modified | null | null | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We compare and contrast the computations that lead to the NMSGUT spectra and
Yukawa couplings that appeared\cite{nmsgut} in 2006 and a recent recalculation
of the same\cite{malinsky}. We argue that an explicit component based method of
computation jeopardizes the power of SO(10) and its sub-groups to organize, in
a unified and automatically phase correlated way, computations of dynamics
beyond the basic mass matrix computation. The correct (one line) prescription
for generating MSSM Yukawas from SO(10) ones was given in \cite{ag2} and
requires no computation beyond the identification of null vectors of the Higgs
doublet mass matrix and the Clebsches given in \cite{ag1,ag2}. It was already
used to derive all fermion Yukawas and Majorana masses in \cite{ag2,nmsgut}. We
thus urge the adoption of a uniform notation and methodology based on descent
from SO(10) to the SM through the Pati-Salam maximal subgroup of SO(10) to
avoid Babel in this rapidly developing and highly promising subject.
| [
{
"created": "Fri, 11 Jul 2008 19:10:50 GMT",
"version": "v1"
},
{
"created": "Sun, 20 Jul 2008 23:57:14 GMT",
"version": "v2"
}
] | 2008-07-21 | [
[
"Aulakh",
"Charanjit S.",
""
]
] | We compare and contrast the computations that lead to the NMSGUT spectra and Yukawa couplings that appeared\cite{nmsgut} in 2006 and a recent recalculation of the same\cite{malinsky}. We argue that an explicit component based method of computation jeopardizes the power of SO(10) and its sub-groups to organize, in a unified and automatically phase correlated way, computations of dynamics beyond the basic mass matrix computation. The correct (one line) prescription for generating MSSM Yukawas from SO(10) ones was given in \cite{ag2} and requires no computation beyond the identification of null vectors of the Higgs doublet mass matrix and the Clebsches given in \cite{ag1,ag2}. It was already used to derive all fermion Yukawas and Majorana masses in \cite{ag2,nmsgut}. We thus urge the adoption of a uniform notation and methodology based on descent from SO(10) to the SM through the Pati-Salam maximal subgroup of SO(10) to avoid Babel in this rapidly developing and highly promising subject. |
hep-ph/0502033 | Qiang Zhao | Qiang Zhao | Study the exotic $\Theta^+$ in polarized photoproduction reactions | Plenary talk at NSTAR2004, Proceedings of the Workshop on the Physics
of Excited Nucleons, p.63 (2004), Grenoble, France, Mar. 2004 | null | null | null | hep-ph hep-ex nucl-ex nucl-th | null | We present an analysis of a Beam-Target double polarization asymmetry in
$\gamma n\to \Theta^+ K^-$. We show that this quantity can serve as a filter
for the determination of the $\Theta^+$'s spin-parity assignment near
threshold. It is highly selective between $1/2^+$ and $1/2^-$ configurations
due to dynamical reasons.
| [
{
"created": "Thu, 3 Feb 2005 10:32:56 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Zhao",
"Qiang",
""
]
] | We present an analysis of a Beam-Target double polarization asymmetry in $\gamma n\to \Theta^+ K^-$. We show that this quantity can serve as a filter for the determination of the $\Theta^+$'s spin-parity assignment near threshold. It is highly selective between $1/2^+$ and $1/2^-$ configurations due to dynamical reasons. |
2203.09307 | Anatoly Kotikov Vassilievich | A.V. Kotikov, I.A. Zemlyakov | Fractional Analytic QCD beyond Leading Order | 39 pages, 16 figures | null | 10.1088/1361-6471/ac99ce | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Fractional analytic QCD is constructed beyond leading order using the
standard inverse logarithmic expansion.
It is shown that, contrary to the usual QCD coupling constant, for which this
expansion can be used
only for large values of its argument, in the case of analytic QCD, the
inverse logarithmic expansion
is applicable for all values of the argument of the analytic coupling
constant.
We present four different views, two of which are based primarily on
Polylogarithms and generalized Euler $\zeta$-functions, and the other two are
based
on dispersion integrals.
The results obtained up to the 5th order of perturbation theory, have a
compact form and do not contain complex special functions that were used to
solve
this problem earlier.
As an example, we apply our results to study the polarized Bjorken sum rule,
which is currently measured very accurately.
| [
{
"created": "Thu, 17 Mar 2022 13:21:09 GMT",
"version": "v1"
},
{
"created": "Mon, 28 Mar 2022 14:52:10 GMT",
"version": "v2"
},
{
"created": "Mon, 4 Apr 2022 13:52:19 GMT",
"version": "v3"
},
{
"created": "Sun, 28 May 2023 16:41:25 GMT",
"version": "v4"
}
] | 2023-05-30 | [
[
"Kotikov",
"A. V.",
""
],
[
"Zemlyakov",
"I. A.",
""
]
] | Fractional analytic QCD is constructed beyond leading order using the standard inverse logarithmic expansion. It is shown that, contrary to the usual QCD coupling constant, for which this expansion can be used only for large values of its argument, in the case of analytic QCD, the inverse logarithmic expansion is applicable for all values of the argument of the analytic coupling constant. We present four different views, two of which are based primarily on Polylogarithms and generalized Euler $\zeta$-functions, and the other two are based on dispersion integrals. The results obtained up to the 5th order of perturbation theory, have a compact form and do not contain complex special functions that were used to solve this problem earlier. As an example, we apply our results to study the polarized Bjorken sum rule, which is currently measured very accurately. |
hep-ph/9502265 | Bonnie Friedman | Xiangdong Ji | HADRON SUBSTRUCTURE PROBED WITH HADRON BEAMS | 13 pages, ReVTeX, 8 figures (available by hardcopy only) Talk
presented at the NSAC/DNP town meeting on ``Nuclear Physics with Intermediate
and High-Energy Hadron Probes,'' Argonne, January 29--30, 1995 | null | null | MIT-CTP-2410 | hep-ph | null | In this talk, I focus on the quark-gluon structure of hadrons probed using
high-energy hadron beams. I start with a brief review on recent major
achievements in measuring parton distributions of the nucleon, pion, and kaon,
with hadron facilities at CERN and FNAL\@. Then I discuss a number of
outstanding questions and interesting physics issues in the field, and point
out their intellectual impact on nuclear physics as a whole. While advocating a
continuing exploitation of hadron beams at CERN and FNAL, I strongly emphasize
the role of a polarized RHIC, where a major nuclear physics program on the
structure of hadrons can thrive.
| [
{
"created": "Thu, 9 Feb 1995 17:40:25 GMT",
"version": "v1"
}
] | 2016-09-01 | [
[
"Ji",
"Xiangdong",
""
]
] | In this talk, I focus on the quark-gluon structure of hadrons probed using high-energy hadron beams. I start with a brief review on recent major achievements in measuring parton distributions of the nucleon, pion, and kaon, with hadron facilities at CERN and FNAL\@. Then I discuss a number of outstanding questions and interesting physics issues in the field, and point out their intellectual impact on nuclear physics as a whole. While advocating a continuing exploitation of hadron beams at CERN and FNAL, I strongly emphasize the role of a polarized RHIC, where a major nuclear physics program on the structure of hadrons can thrive. |
0711.4153 | Abbas Kenan Ciftci | A. K. Ciftci, R. Ciftci, S. Sultansoy | Anomalous Single Production of the Fourth Generation Neutrino at Future
ep Colliders | 11 pages, 6 figures, 5 tables | Phys.Lett.B660:534-538,2008 | 10.1016/j.physletb.2008.01.039 | null | hep-ph | null | Possible single productions of the fourth standard model generation neutrino
via anomalous interactions at the future ep colliders are studied. Signatures
of such anomalous processes and backgrounds are discussed in detail. Discovery
limits for neutrino mass and achievable values of anomalous coupling strength
are determined.
| [
{
"created": "Tue, 27 Nov 2007 00:07:01 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Ciftci",
"A. K.",
""
],
[
"Ciftci",
"R.",
""
],
[
"Sultansoy",
"S.",
""
]
] | Possible single productions of the fourth standard model generation neutrino via anomalous interactions at the future ep colliders are studied. Signatures of such anomalous processes and backgrounds are discussed in detail. Discovery limits for neutrino mass and achievable values of anomalous coupling strength are determined. |
0907.5135 | Stephane Monteil | O.Deschamps, S. Descotes-Genon, S. Monteil, V. Niess, S. T'Jampens, V.
Tisserand | The Two Higgs Doublet of Type II facing flavour physics data | 34 pages, 12 figures, article | Phys.Rev.D82:073012,2010 | 10.1103/PhysRevD.82.073012 | LPC-CF/2009-05, LPT-ORSAY/2009-43, LAPP-EXP/2009-03 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We discuss tests of the charged Higgs sector of the Two Higgs Doublet Model
(2HDM) of Type II in the light of recent flavour physics data. Particular
attention is paid to recent measurement of purely leptonic decays of
heavy-light mesons, which depart more or less significantly from the Standard
Model (SM) predictions. We derive constraints on the parameters of the 2HDM
type II from leptonic and semileptonic $\Delta F=1$ decays as well as loop
processes ($b \to s \gamma$, $B\bar{B}$ mixing or $Z\to\bar{b}b$) sensitive to
charged Higgs contributions.
The outcome of this work is that while 2HDM Type II can fit individual
observable through fine-tuning schemes, in a combined analysis it does not
perform better than the SM by favouring a decoupling solution. Assuming that
2HDM Type II is realized in Nature, constraints on its parameters ($m_{H^+}$
and $\tan \beta$) are derived. A limit on the charged Higgs mass $m_{H^+} > 316
\; {\rm GeV}$ at $95\%$~CL is obtained irrespective of the value of $\tan
\beta$. This limit is dominated by the $b\rightarrow s \gamma$ branching ratio
measurement.
All results have been obtained with the \ckmfitter\ analysis package,
featuring the frequentist statistical approach \rfit\ to handle theoretical
uncertainties.
| [
{
"created": "Wed, 29 Jul 2009 15:58:05 GMT",
"version": "v1"
},
{
"created": "Thu, 24 Jun 2010 10:15:14 GMT",
"version": "v2"
}
] | 2010-11-11 | [
[
"Deschamps",
"O.",
""
],
[
"Descotes-Genon",
"S.",
""
],
[
"Monteil",
"S.",
""
],
[
"Niess",
"V.",
""
],
[
"T'Jampens",
"S.",
""
],
[
"Tisserand",
"V.",
""
]
] | We discuss tests of the charged Higgs sector of the Two Higgs Doublet Model (2HDM) of Type II in the light of recent flavour physics data. Particular attention is paid to recent measurement of purely leptonic decays of heavy-light mesons, which depart more or less significantly from the Standard Model (SM) predictions. We derive constraints on the parameters of the 2HDM type II from leptonic and semileptonic $\Delta F=1$ decays as well as loop processes ($b \to s \gamma$, $B\bar{B}$ mixing or $Z\to\bar{b}b$) sensitive to charged Higgs contributions. The outcome of this work is that while 2HDM Type II can fit individual observable through fine-tuning schemes, in a combined analysis it does not perform better than the SM by favouring a decoupling solution. Assuming that 2HDM Type II is realized in Nature, constraints on its parameters ($m_{H^+}$ and $\tan \beta$) are derived. A limit on the charged Higgs mass $m_{H^+} > 316 \; {\rm GeV}$ at $95\%$~CL is obtained irrespective of the value of $\tan \beta$. This limit is dominated by the $b\rightarrow s \gamma$ branching ratio measurement. All results have been obtained with the \ckmfitter\ analysis package, featuring the frequentist statistical approach \rfit\ to handle theoretical uncertainties. |
2307.05290 | Xing-Bo Yuan | Xin-Qiang Li, Ze-Jun Xie, Ya-Dong Yang and Xing-Bo Yuan | Correlating the CDF $W$-mass shift with the muon $g-2$ and the $b \to s
\ell^+ \ell^-$ transitions | 34 pages, 15 figures, comments welcome | null | null | null | hep-ph | http://creativecommons.org/licenses/by/4.0/ | Motivated by the latest CDF $W$-mass measurement as well as the muon $g-2$
anomaly and the discrepancies observed in $b \to s \ell^+ \ell^-$ transitions,
we propose an extension of the Standard Model (SM) with the $SU(2)_L$-singlet
vector-like fermion partners that are featured by additional $U(1)^\prime$
gauge symmetry. The fermion partners have the same SM quantum numbers as of the
right-handed SM fermions, and can therefore mix with the latter after the
electroweak and the $U(1)^\prime$ symmetry breaking. As a result, desirable
loop-level corrections to the $(g-2)_\mu$, the $W$-boson mass $m_W$ and the
Wilson coefficient $C_9$ in $b \to s \mu^+ \mu^-$ transitions can be obtained.
The final allowed parameter space is also consistent with the constraints from
the $Z \to \mu^+ \mu^-$ decay, the neutrino trident production and the LHC
direct searches for the vector-like quarks and leptons.
| [
{
"created": "Tue, 11 Jul 2023 14:35:40 GMT",
"version": "v1"
}
] | 2023-07-12 | [
[
"Li",
"Xin-Qiang",
""
],
[
"Xie",
"Ze-Jun",
""
],
[
"Yang",
"Ya-Dong",
""
],
[
"Yuan",
"Xing-Bo",
""
]
] | Motivated by the latest CDF $W$-mass measurement as well as the muon $g-2$ anomaly and the discrepancies observed in $b \to s \ell^+ \ell^-$ transitions, we propose an extension of the Standard Model (SM) with the $SU(2)_L$-singlet vector-like fermion partners that are featured by additional $U(1)^\prime$ gauge symmetry. The fermion partners have the same SM quantum numbers as of the right-handed SM fermions, and can therefore mix with the latter after the electroweak and the $U(1)^\prime$ symmetry breaking. As a result, desirable loop-level corrections to the $(g-2)_\mu$, the $W$-boson mass $m_W$ and the Wilson coefficient $C_9$ in $b \to s \mu^+ \mu^-$ transitions can be obtained. The final allowed parameter space is also consistent with the constraints from the $Z \to \mu^+ \mu^-$ decay, the neutrino trident production and the LHC direct searches for the vector-like quarks and leptons. |
1309.6640 | Ian Lewis | Hooman Davoudiasl, Ian M. Lewis | Dark Matter from Hidden Forces | 11 pages, 4 figures; References and additional comments added.
Results unchanged | Phys. Rev. D 89, 055026 (2014) | 10.1103/PhysRevD.89.055026 | null | hep-ph astro-ph.CO hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We examine the possibility that dark matter may be the manifestation of dark
forces of a hidden sector, i.e. "Dark Force = Dark Matter." As an illustrative
and minimal example we consider the hidden SU(2)_h x U(1)_h gauge group. The
hidden dynamics is indirectly coupled to the Standard Model (SM) through
kinetic mixing of U(1)_h with the U(1)_Y of hypercharge. We assume a hidden
symmetry breaking pattern analogous to that of the SM electroweak symmetry,
augmented with an extra scalar that allows both the "hidden Z boson" Z_h and
the "hidden photon" \gamma_h to be massive. The "hidden W" bosons W_h are dark
matter in this scenario. This setup can readily accommodate a potential direct
detection signal for dark matter at ~10 GeV from CDMSII-Si data. For some
choices of parameters, the model can lead to signals both in "dark matter beam"
experiments, from Z_h\to W_h W_h, as well as in experiments that look for
visible signals of dark photons, mediated by \gamma_h. Other possible
phenomenological consequences are also briefly discussed.
| [
{
"created": "Wed, 25 Sep 2013 20:00:02 GMT",
"version": "v1"
},
{
"created": "Fri, 11 Oct 2013 22:27:06 GMT",
"version": "v2"
}
] | 2014-04-02 | [
[
"Davoudiasl",
"Hooman",
""
],
[
"Lewis",
"Ian M.",
""
]
] | We examine the possibility that dark matter may be the manifestation of dark forces of a hidden sector, i.e. "Dark Force = Dark Matter." As an illustrative and minimal example we consider the hidden SU(2)_h x U(1)_h gauge group. The hidden dynamics is indirectly coupled to the Standard Model (SM) through kinetic mixing of U(1)_h with the U(1)_Y of hypercharge. We assume a hidden symmetry breaking pattern analogous to that of the SM electroweak symmetry, augmented with an extra scalar that allows both the "hidden Z boson" Z_h and the "hidden photon" \gamma_h to be massive. The "hidden W" bosons W_h are dark matter in this scenario. This setup can readily accommodate a potential direct detection signal for dark matter at ~10 GeV from CDMSII-Si data. For some choices of parameters, the model can lead to signals both in "dark matter beam" experiments, from Z_h\to W_h W_h, as well as in experiments that look for visible signals of dark photons, mediated by \gamma_h. Other possible phenomenological consequences are also briefly discussed. |
2207.09900 | XiaoHai Liu | Ying-Hui Ge, Xiao-Hai Liu, Hong-Wei Ke | Possibility of $T_{c\bar{s}}(2900)$ as the resonance-like structure
induced by threshold effects | 8 pages, 6 figures | null | 10.1140/epjc/s10052-022-10923-8 | null | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We investigate the process $B\to \bar{D}D_s \pi$ via several rescattering
processes. It is shown that the triangle singularity (TS) peak around the
$D^*K^*$ threshold generated from the $\chi_{c1}K^* D^*$ loop is relatively
narrow, which may simulate the resonance-like structure $T_{c\bar{s}}(2900)$
recently observed by LHCb in the $D_s\pi$ spectrum. However, the TS peak around
the $D_s^*\rho$ threshold generated from the $D^{**} D_s^* \rho$ loop is
smoothed by the broad width of $\rho$, which itself can hardly describe the
$T_{c\bar{s}}(2900)$ structure. A TS signal around the $DK$ threshold generated
from the $\chi_{c0}K D $ loop is also predicted.
| [
{
"created": "Wed, 20 Jul 2022 13:51:47 GMT",
"version": "v1"
}
] | 2022-11-23 | [
[
"Ge",
"Ying-Hui",
""
],
[
"Liu",
"Xiao-Hai",
""
],
[
"Ke",
"Hong-Wei",
""
]
] | We investigate the process $B\to \bar{D}D_s \pi$ via several rescattering processes. It is shown that the triangle singularity (TS) peak around the $D^*K^*$ threshold generated from the $\chi_{c1}K^* D^*$ loop is relatively narrow, which may simulate the resonance-like structure $T_{c\bar{s}}(2900)$ recently observed by LHCb in the $D_s\pi$ spectrum. However, the TS peak around the $D_s^*\rho$ threshold generated from the $D^{**} D_s^* \rho$ loop is smoothed by the broad width of $\rho$, which itself can hardly describe the $T_{c\bar{s}}(2900)$ structure. A TS signal around the $DK$ threshold generated from the $\chi_{c0}K D $ loop is also predicted. |
hep-ph/0109089 | Valeri V. Kiselev | V.V.Kiselev | CP-violation in the heavy quark systems | 15 pages, 11 eps figures, a talk given at XXIV International Workshop
on Fundamental Problems of High Energy Physics and Field Theory, Protvino,
2001 | null | null | null | hep-ph | null | We present a review of general picture in the sector of electroweak symmetry
breaking with the CP-violation in the heavy quark interactions.
| [
{
"created": "Tue, 11 Sep 2001 05:36:57 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Kiselev",
"V. V.",
""
]
] | We present a review of general picture in the sector of electroweak symmetry breaking with the CP-violation in the heavy quark interactions. |
hep-ph/9501315 | Mad | Marco A. Diaz (U. of Southampton) and Tonnis A. ter Veldhuis
(Vanderbilt U.) | Radiative Corrections to Charged Higgs Production in e+ e- Colliders | 6 pages, LATEX, 4 figures uufiled | null | null | VAND-TH-94-25, SHEP-95-02 | hep-ph | null | We study one loop electroweak corrections to the production of a pair of
charged Higgs bosons through an intermediate $Z$-boson or photon. In
particular, we consider the effects of graphs with top and bottom quarks and
squarks in the loop within the context of the Minimal Supersymmetric Model. We
find that the corrections can be considerable, and typically are of the order
of 10\% to 20\%.
| [
{
"created": "Tue, 17 Jan 1995 11:32:03 GMT",
"version": "v1"
}
] | 2016-09-01 | [
[
"Diaz",
"Marco A.",
"",
"U. of Southampton"
],
[
"ter Veldhuis",
"Tonnis A.",
"",
"Vanderbilt U."
]
] | We study one loop electroweak corrections to the production of a pair of charged Higgs bosons through an intermediate $Z$-boson or photon. In particular, we consider the effects of graphs with top and bottom quarks and squarks in the loop within the context of the Minimal Supersymmetric Model. We find that the corrections can be considerable, and typically are of the order of 10\% to 20\%. |
1810.04192 | Sujata Pandey | Siddhartha Karmakar, Sujata Pandey, Subhendu Rakshit | Are We Looking at Neutrino Absorption Spectra at IceCube? | 3 pages, 4 figures | null | null | null | hep-ph astro-ph.HE | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The observed spectrum of ultrahigh energy neutrinos at IceCube might be
indicative of absorption of such neutrinos in ultralight dark matter halos. We
point out that various features of this spectrum can be explained by such
absorptions. For a light $Z^\prime$-mediated $t$-channel interaction between
dark matter and neutrinos, we propose a novel mechanism of absorption of these
neutrinos at particular energies. This can save the models of AGN predicting
large neutrino flux at energies more than a PeV.
| [
{
"created": "Tue, 9 Oct 2018 18:08:46 GMT",
"version": "v1"
}
] | 2018-10-12 | [
[
"Karmakar",
"Siddhartha",
""
],
[
"Pandey",
"Sujata",
""
],
[
"Rakshit",
"Subhendu",
""
]
] | The observed spectrum of ultrahigh energy neutrinos at IceCube might be indicative of absorption of such neutrinos in ultralight dark matter halos. We point out that various features of this spectrum can be explained by such absorptions. For a light $Z^\prime$-mediated $t$-channel interaction between dark matter and neutrinos, we propose a novel mechanism of absorption of these neutrinos at particular energies. This can save the models of AGN predicting large neutrino flux at energies more than a PeV. |
hep-ph/0111370 | Bartjan van Tent | B.J.W. van Tent and S. Groot Nibbelink | Inflationary perturbations with multiple scalar fields | 11 pages, 2 figures. Talk given at COSMO-01 Workshop, Rovaniemi,
Finland, August 30 - September 4, 2001 | null | null | SPIN-2001/28, ITP-UU-01/35 | hep-ph | null | The calculation of scalar gravitational and matter perturbations during
multiple-field inflation valid to first order in slow roll is discussed. These
fields may be the coordinates of a non-trivial field manifold and hence have
non-minimal kinetic terms. A basis for these perturbations determined by the
background dynamics is introduced, and the slow-roll functions are generalized
to the multiple-field case. Solutions for a perturbation mode in its three
different behavioural regimes are combined, leading to an analytic expression
for the correlator of the gravitational potential. Multiple-field effects
caused by the coupling to the field perturbation perpendicular to the field
velocity can even contribute at leading order. This is illustrated numerically
with an example of a quadratic potential. (The material here is based on
previous work by the authors presented in hep-ph/0107272.)
| [
{
"created": "Wed, 28 Nov 2001 11:28:46 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"van Tent",
"B. J. W.",
""
],
[
"Nibbelink",
"S. Groot",
""
]
] | The calculation of scalar gravitational and matter perturbations during multiple-field inflation valid to first order in slow roll is discussed. These fields may be the coordinates of a non-trivial field manifold and hence have non-minimal kinetic terms. A basis for these perturbations determined by the background dynamics is introduced, and the slow-roll functions are generalized to the multiple-field case. Solutions for a perturbation mode in its three different behavioural regimes are combined, leading to an analytic expression for the correlator of the gravitational potential. Multiple-field effects caused by the coupling to the field perturbation perpendicular to the field velocity can even contribute at leading order. This is illustrated numerically with an example of a quadratic potential. (The material here is based on previous work by the authors presented in hep-ph/0107272.) |
2212.02787 | Xinjian Wen | Rui He and Xin-Jian Wen | Effect of anomalous magnetic moment on the chiral transition at zero
temperature in a strong magnetic field | 9 pages, 6 figures | Physical Review D 106, 116023 (2022) | 10.1103/PhysRevD.106.116023 | null | hep-ph | http://creativecommons.org/licenses/by/4.0/ | The effect of the anomalous magnetic moment (AMM) on the chiral restoration
is investigated at zero temperature in the strong magnetic fields with the
vacuum magnetic regularization scheme. It is shown that the chiral restoration
diagram sensitively depends on the AMM in the ultrastrong magnetic fields. In
our work, the parameterization of AMM is employed as proportional to the square
of the chiral condensate. The critical chemical potential is found to decrease
linearly by the increasing coefficient in the AMM scale. At a smaller scale of
the AMM, the critical chemical potential could go down and then grow up as the
magnetic field increases. But at a larger scale, the magnetic catalysis on the
critical chemical potential would not happen anymore.
| [
{
"created": "Tue, 6 Dec 2022 06:57:51 GMT",
"version": "v1"
},
{
"created": "Fri, 30 Dec 2022 07:57:43 GMT",
"version": "v2"
}
] | 2023-01-02 | [
[
"He",
"Rui",
""
],
[
"Wen",
"Xin-Jian",
""
]
] | The effect of the anomalous magnetic moment (AMM) on the chiral restoration is investigated at zero temperature in the strong magnetic fields with the vacuum magnetic regularization scheme. It is shown that the chiral restoration diagram sensitively depends on the AMM in the ultrastrong magnetic fields. In our work, the parameterization of AMM is employed as proportional to the square of the chiral condensate. The critical chemical potential is found to decrease linearly by the increasing coefficient in the AMM scale. At a smaller scale of the AMM, the critical chemical potential could go down and then grow up as the magnetic field increases. But at a larger scale, the magnetic catalysis on the critical chemical potential would not happen anymore. |
1103.2993 | Jos\'e Herman Mu\~noz | G. Lopez Castro and J. H. Munoz | Tensor mesons produced in tau lepton decays | 10 pages, 1 figure. Version accepted for publication in PRD, some
typos are corrected and comments are added in section 4. Conclusions remain
unchanged | Phys.Rev.D83:094016,2011 | 10.1103/PhysRevD.83.094016 | null | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Light tensor mesons (T = a_2, f_2 and K_2^*) can be produced in decays of tau
leptons. In this paper we compute the branching ratios of tau --> T pi nu
decays by assuming the dominance of intermediate virtual states to model the
form factors involved in the relevant hadronic matrix element. The exclusive
f_2(1270) pi^- decay mode turns out to have the largest branching ratio, of
O(10^-4) . Our results indicate that the contributions of tensor meson
intermediate states to the three-pseudoscalar channels of tau decays are rather
small.
| [
{
"created": "Tue, 15 Mar 2011 19:03:01 GMT",
"version": "v1"
},
{
"created": "Thu, 28 Apr 2011 13:35:55 GMT",
"version": "v2"
}
] | 2011-05-19 | [
[
"Castro",
"G. Lopez",
""
],
[
"Munoz",
"J. H.",
""
]
] | Light tensor mesons (T = a_2, f_2 and K_2^*) can be produced in decays of tau leptons. In this paper we compute the branching ratios of tau --> T pi nu decays by assuming the dominance of intermediate virtual states to model the form factors involved in the relevant hadronic matrix element. The exclusive f_2(1270) pi^- decay mode turns out to have the largest branching ratio, of O(10^-4) . Our results indicate that the contributions of tensor meson intermediate states to the three-pseudoscalar channels of tau decays are rather small. |
0803.0144 | Ernest Ma | Ernest Ma (UC Riverside) | B and not L in supersymmetry: new U(1) gauge symmetry and dark matter | 6pages, no figure | Phys.Rev.D78:017701,2008 | 10.1103/PhysRevD.78.017701 | UCRHEP-T449 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | To enforce the conservation of baryon number B and not lepton number L in
supersymmetry, a new U(1)_X gauge symmetry is recommended. An example is
offered with new particles interacting under U(1)_X which are good candidates
for the dark matter of the Universe.
| [
{
"created": "Sun, 2 Mar 2008 20:38:57 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Ma",
"Ernest",
"",
"UC Riverside"
]
] | To enforce the conservation of baryon number B and not lepton number L in supersymmetry, a new U(1)_X gauge symmetry is recommended. An example is offered with new particles interacting under U(1)_X which are good candidates for the dark matter of the Universe. |
hep-ph/9810334 | Yamaguchi Masahide | T. Asaka, M. Kawasaki, and Masahide Yamaguchi | Cosmological Moduli Problem and Oscillating Inflation in Gauge-Mediated
Supersymmetry Breaking | Some typos and statements are corrected; to appear in Phys. Lett. B | Phys.Lett. B451 (1999) 317-323 | 10.1016/S0370-2693(99)00213-0 | null | hep-ph astro-ph | null | We investigate cosmological moduli problem in the gauge-mediated
supersymmetry breaking (GMSB). A mini-inflation (oscillating inflation) takes
place when a scalar field corresponding to the flat direction in GMSB
oscillates along the logarithmic potential induced by the gauge-mediation
mechanism. It is shown that this oscillating inflation can sufficiently dilute
the relic abundance of the string moduli for some ranges of parameters in the
GMSB models.
| [
{
"created": "Tue, 13 Oct 1998 10:12:09 GMT",
"version": "v1"
},
{
"created": "Wed, 14 Oct 1998 03:19:06 GMT",
"version": "v2"
},
{
"created": "Mon, 1 Mar 1999 03:13:07 GMT",
"version": "v3"
}
] | 2009-10-31 | [
[
"Asaka",
"T.",
""
],
[
"Kawasaki",
"M.",
""
],
[
"Yamaguchi",
"Masahide",
""
]
] | We investigate cosmological moduli problem in the gauge-mediated supersymmetry breaking (GMSB). A mini-inflation (oscillating inflation) takes place when a scalar field corresponding to the flat direction in GMSB oscillates along the logarithmic potential induced by the gauge-mediation mechanism. It is shown that this oscillating inflation can sufficiently dilute the relic abundance of the string moduli for some ranges of parameters in the GMSB models. |
hep-ph/0203065 | Kevin Lynch | Kenneth Lane (1 and 2), Kevin R. Lynch (2), Stephen Mrenna (1), and
Elizabeth H. Simmons (2 and 3) ((1) Fermi National Accelerator Laboratory,
(2) Boston University, (3) Harvard University) | Resonant and Non-Resonant Effects in Photon-Technipion Production at
Lepton Colliders | 11 pages, including title page, 3 figures; version 2: references
added | Phys.Rev. D66 (2002) 015001 | 10.1103/PhysRevD.66.015001 | BUHEP-02-14, FERMILAB-PUB-02/039-T, HUTP-01/A072 | hep-ph hep-ex | null | Lepton collider experiments can search for light technipions in final states
made striking by the presence of an energetic photon: $e+e- \to
\photon\technipion$. To date, searches have focused on either production
through anomalous coupling of the technipions to electroweak gauge bosons or on
production through a technivector meson (\technirho, \techniomega) resonance.
This paper creates a combined framework in which both contributions are
included. This will allow stronger and more accurate limits on technipion
production to be set using existing data from LEP or future data from a
higher-energy linear collider. We provide explicit formulas and sample
calculations (analytic and Pythia) in the framework of the Technicolor Straw
Man Model, a model that includes light technihadrons.
| [
{
"created": "Wed, 6 Mar 2002 17:49:33 GMT",
"version": "v1"
},
{
"created": "Tue, 26 Mar 2002 18:05:41 GMT",
"version": "v2"
},
{
"created": "Tue, 26 Mar 2002 21:47:45 GMT",
"version": "v3"
}
] | 2009-11-07 | [
[
"Lane",
"Kenneth",
"",
"1 and 2"
],
[
"Lynch",
"Kevin R.",
"",
"2 and 3"
],
[
"Mrenna",
"Stephen",
"",
"2 and 3"
],
[
"Simmons",
"Elizabeth H.",
"",
"2 and 3"
]
] | Lepton collider experiments can search for light technipions in final states made striking by the presence of an energetic photon: $e+e- \to \photon\technipion$. To date, searches have focused on either production through anomalous coupling of the technipions to electroweak gauge bosons or on production through a technivector meson (\technirho, \techniomega) resonance. This paper creates a combined framework in which both contributions are included. This will allow stronger and more accurate limits on technipion production to be set using existing data from LEP or future data from a higher-energy linear collider. We provide explicit formulas and sample calculations (analytic and Pythia) in the framework of the Technicolor Straw Man Model, a model that includes light technihadrons. |
hep-ph/0404016 | Ta-chung Meng | Liu Qin, Meng Ta-chung | Direct evidence for the validity of Hurst's empirical law in hadron
production processes | 14 Pages, 3 figure | Phys.Rev. D72 (2005) 014011 | 10.1103/PhysRevD.72.014011 | null | hep-ph | null | We propose to use the rescaled range analysis to examine the records of
rapidity-dependence of multiplicities in high-energy collision processes. We
probe event by event the existence of global statistical dependence in the
system of produced hadrons, and demonstrate the effectiveness of the
above-mentioned statistical method by applying it to the cosmic-ray data of the
JACEE collaboration, and by comparing the obtained results with other
experimental results for similar reactions at accelerator and collider
energies. We present experimental evidence for the validity of Hurst's
empirical law, and the evidence for the existence of global statistical
dependence, fractal dimension, and scaling behavior in such systems of hadronic
matter. None of these features is directly related to the basis of the
conventional physical picture. Hence, it is not clear whether (and if yes, how
and why) these striking empirical regularities can be understood in terms of
the conventional theory.
| [
{
"created": "Fri, 2 Apr 2004 02:01:28 GMT",
"version": "v1"
},
{
"created": "Fri, 16 Apr 2004 01:30:57 GMT",
"version": "v2"
},
{
"created": "Mon, 23 May 2005 07:03:44 GMT",
"version": "v3"
}
] | 2009-11-10 | [
[
"Qin",
"Liu",
""
],
[
"Ta-chung",
"Meng",
""
]
] | We propose to use the rescaled range analysis to examine the records of rapidity-dependence of multiplicities in high-energy collision processes. We probe event by event the existence of global statistical dependence in the system of produced hadrons, and demonstrate the effectiveness of the above-mentioned statistical method by applying it to the cosmic-ray data of the JACEE collaboration, and by comparing the obtained results with other experimental results for similar reactions at accelerator and collider energies. We present experimental evidence for the validity of Hurst's empirical law, and the evidence for the existence of global statistical dependence, fractal dimension, and scaling behavior in such systems of hadronic matter. None of these features is directly related to the basis of the conventional physical picture. Hence, it is not clear whether (and if yes, how and why) these striking empirical regularities can be understood in terms of the conventional theory. |
1104.4067 | Tord Riemann | J. Fleischer, T. Riemann | Calculating contracted tensor Feynman integrals | 12 pages, version 2 is slightly extended, few typos corrected | Phys.Lett.B701:646-653,2011 | 10.1016/j.physletb.2011.06.033 | DESY 11-063, BI-TP 2011/12, SFB/CPP-11-25, LPN 11-26 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A recently derived approach to the tensor reduction of 5-point one-loop
Feynman integrals expresses the tensor coefficients by scalar 1-point to
4-point Feynman integrals completely algebraically. In this letter we derive
extremely compact algebraic expressions for the contractions of the tensor
integrals with external momenta. This is based on sums over signed minors
weighted with scalar products of the external momenta. With these contractions
one can construct the invariant amplitudes of the matrix elements under
consideration, and the evaluation of one-loop contributions to massless and
massive multi-particle production at high energy colliders like LHC and ILC is
expected to be performed very efficiently.
| [
{
"created": "Wed, 20 Apr 2011 16:11:26 GMT",
"version": "v1"
},
{
"created": "Wed, 18 May 2011 14:57:09 GMT",
"version": "v2"
}
] | 2011-07-20 | [
[
"Fleischer",
"J.",
""
],
[
"Riemann",
"T.",
""
]
] | A recently derived approach to the tensor reduction of 5-point one-loop Feynman integrals expresses the tensor coefficients by scalar 1-point to 4-point Feynman integrals completely algebraically. In this letter we derive extremely compact algebraic expressions for the contractions of the tensor integrals with external momenta. This is based on sums over signed minors weighted with scalar products of the external momenta. With these contractions one can construct the invariant amplitudes of the matrix elements under consideration, and the evaluation of one-loop contributions to massless and massive multi-particle production at high energy colliders like LHC and ILC is expected to be performed very efficiently. |
1106.3583 | Matthew Buckley | Matthew R. Buckley, Dan Hooper, and Jonathan L. Rosner | A Leptophobic Z' And Dark Matter From Grand Unification | 6 pages, 2 figure | null | 10.1016/j.physletb.2011.08.014 | FERMILAB-PUB-11-278-A, EFI 11-15 | hep-ph astro-ph.CO astro-ph.GA astro-ph.HE | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We explore the phenomenology of Grand Unified Models based on the E_6 group,
focusing on the Z' with suppressed couplings to leptons that can appear in such
models. We find that this Z' can accommodate the W+dijets anomaly reported by
the CDF collaboration. Furthermore, a viable dark matter candidate in the form
of a right-handed sneutrino is also present within the fundamental
27-dimensional representation of E_6. Through its sizable couplings to the Z',
the dark matter is predicted to possess an elastic scattering cross section
with neutrons which can generate the signals reported by the CoGeNT and
DAMA/LIBRA collaborations. To avoid being overproduced in the early universe,
the dark matter must annihilate to leptons through the exchange of charged or
neutral fermions which appear in the 27 of E_6, providing an excellent fit to
the gamma ray spectrum observed from the Galactic Center by the Fermi Gamma Ray
Space Telescope.
| [
{
"created": "Fri, 17 Jun 2011 21:36:16 GMT",
"version": "v1"
},
{
"created": "Mon, 12 Sep 2011 15:13:18 GMT",
"version": "v2"
}
] | 2015-05-28 | [
[
"Buckley",
"Matthew R.",
""
],
[
"Hooper",
"Dan",
""
],
[
"Rosner",
"Jonathan L.",
""
]
] | We explore the phenomenology of Grand Unified Models based on the E_6 group, focusing on the Z' with suppressed couplings to leptons that can appear in such models. We find that this Z' can accommodate the W+dijets anomaly reported by the CDF collaboration. Furthermore, a viable dark matter candidate in the form of a right-handed sneutrino is also present within the fundamental 27-dimensional representation of E_6. Through its sizable couplings to the Z', the dark matter is predicted to possess an elastic scattering cross section with neutrons which can generate the signals reported by the CoGeNT and DAMA/LIBRA collaborations. To avoid being overproduced in the early universe, the dark matter must annihilate to leptons through the exchange of charged or neutral fermions which appear in the 27 of E_6, providing an excellent fit to the gamma ray spectrum observed from the Galactic Center by the Fermi Gamma Ray Space Telescope. |
0704.1344 | Chuan-Ren Chen | Qing-Hong Cao and Chuan-Ren Chen | Resummation Effects in the Search of SM Higgs Boson at Hadron Colliders | The version to appear in PRD | Phys.Rev.D76:073006,2007 | 10.1103/PhysRevD.76.073006 | UCRHEP-T428, MSUHEP-061208 | hep-ph | null | We examine the soft-gluon resummation effects, including the exact spin
correlations among the final state particles, in the search of the Standard
Model Higgs boson, via the process $gg\to H\to WW/ZZ \to 4 leptons, at the
Tevatron and the LHC. A comparison between the resummation and the
Next-to-Leading order (NLO) calculation is performed after imposing various
kinematics cuts suggested in the literature for the Higgs boson search. For the
$H\to ZZ$ mode, the resummation effects increase the acceptance of the signal
events by about 25%, as compared to the NLO prediction, and dramatically alter
various kinematics distributions of the final state leptons. For the $H\to WW$
mode, the acceptance rates of the signal events predicted by the resummation
and NLO calculations are almost the same, but some of the predicted kinematical
distributions are quite different. Thus, to precisely determine the properties
of the Higgs boson at hadron colliders, the soft-gluon resummation effects have
to be taken into account.
| [
{
"created": "Wed, 11 Apr 2007 04:17:27 GMT",
"version": "v1"
},
{
"created": "Fri, 7 Sep 2007 23:43:31 GMT",
"version": "v2"
}
] | 2008-11-26 | [
[
"Cao",
"Qing-Hong",
""
],
[
"Chen",
"Chuan-Ren",
""
]
] | We examine the soft-gluon resummation effects, including the exact spin correlations among the final state particles, in the search of the Standard Model Higgs boson, via the process $gg\to H\to WW/ZZ \to 4 leptons, at the Tevatron and the LHC. A comparison between the resummation and the Next-to-Leading order (NLO) calculation is performed after imposing various kinematics cuts suggested in the literature for the Higgs boson search. For the $H\to ZZ$ mode, the resummation effects increase the acceptance of the signal events by about 25%, as compared to the NLO prediction, and dramatically alter various kinematics distributions of the final state leptons. For the $H\to WW$ mode, the acceptance rates of the signal events predicted by the resummation and NLO calculations are almost the same, but some of the predicted kinematical distributions are quite different. Thus, to precisely determine the properties of the Higgs boson at hadron colliders, the soft-gluon resummation effects have to be taken into account. |
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