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|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
0704.2276 | Hitoshi Murayama | Hitoshi Murayama | Physics Beyond the Standard Model and Dark Matter | Lectures at Les Houches Summer School, Session 86, Particle Physics
and Cosmology: the Fabric of Spacetime, July 31- August 25, 2006 | null | null | null | hep-ph | null | In this lecture note, I discuss why many of us are expecting rich physics at
the TeV scale, drawing analogies from the history of physics in the last
century. Then I review some of the possible candidates of new physics at this
energy scale. I also discuss why we believe much of the matter in the universe
is not atoms (baryons) or compact astronomical objects, and hence requires
physics beyond the standard model. Finally I discuss some of the candidates for
the non-baryonic dark matter.
| [
{
"created": "Wed, 18 Apr 2007 07:25:18 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Murayama",
"Hitoshi",
""
]
] | In this lecture note, I discuss why many of us are expecting rich physics at the TeV scale, drawing analogies from the history of physics in the last century. Then I review some of the possible candidates of new physics at this energy scale. I also discuss why we believe much of the matter in the universe is not atoms (baryons) or compact astronomical objects, and hence requires physics beyond the standard model. Finally I discuss some of the candidates for the non-baryonic dark matter. |
0808.0232 | Xing-Gang Wu | Dai-Min Zeng, Xing-Gang Wu and Zhen-Yun Fang | B-Meson Wave Function through A Comparative Analysis of the $B\to \pi$,
$K$ Transition Form Factors | 15 pages, 3 figures. More discussions and references are added. To be
published in Chinese Physics Letters | Chin.Phys.Lett.26:021401,2009 | 10.1088/0256-307X/26/2/021401 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The properties of the B-meson light-cone wave function up to next-to-leading
order Fock state expansion have been studied through a comparative study of the
$B\to \pi$, $K$ transition form factors within the $k_T$ factorization approach
and the light-cone sum rule analysis. The transition form factors
$F^{B\to\pi}_{+,0,T}$ and $F^{B\to K}_{+,0,T}$ are carefully re-calculated up
to ${\cal O}(1/m_b^2)$ within the $k_T$ factorization approach in the large
recoil region, in which the main theoretical uncertainties are discussed. The
QCD light-cone sum rule is applicable in the large and intermediate energy
regions, and the QCD light-cone sum rule results in Ref.\cite{sumrule} are
adopted for such a comparative study. It is found that when the two
phenomenological parameters $\bar\Lambda\in [0.50,0.55]$ and
$\delta\in[0.25,0.30]$, the results of $F^{B\to\pi}_{+,0,T}(Q^2)$ and $F^{B\to
K}_{+,0,T}(Q^2)$ from these two approaches are consistent with each other in
the large recoil energy region.
| [
{
"created": "Sat, 2 Aug 2008 07:04:24 GMT",
"version": "v1"
},
{
"created": "Wed, 27 Aug 2008 01:14:00 GMT",
"version": "v2"
},
{
"created": "Tue, 23 Dec 2008 08:22:16 GMT",
"version": "v3"
}
] | 2009-11-13 | [
[
"Zeng",
"Dai-Min",
""
],
[
"Wu",
"Xing-Gang",
""
],
[
"Fang",
"Zhen-Yun",
""
]
] | The properties of the B-meson light-cone wave function up to next-to-leading order Fock state expansion have been studied through a comparative study of the $B\to \pi$, $K$ transition form factors within the $k_T$ factorization approach and the light-cone sum rule analysis. The transition form factors $F^{B\to\pi}_{+,0,T}$ and $F^{B\to K}_{+,0,T}$ are carefully re-calculated up to ${\cal O}(1/m_b^2)$ within the $k_T$ factorization approach in the large recoil region, in which the main theoretical uncertainties are discussed. The QCD light-cone sum rule is applicable in the large and intermediate energy regions, and the QCD light-cone sum rule results in Ref.\cite{sumrule} are adopted for such a comparative study. It is found that when the two phenomenological parameters $\bar\Lambda\in [0.50,0.55]$ and $\delta\in[0.25,0.30]$, the results of $F^{B\to\pi}_{+,0,T}(Q^2)$ and $F^{B\to K}_{+,0,T}(Q^2)$ from these two approaches are consistent with each other in the large recoil energy region. |
2012.12969 | Mauro Napsuciale | M. Napsuciale, S. Rodriguez | Complete analytical solution to the quantum Yukawa potential | Updated published version, 5 pages, one figure added, 1 figure
updated, notation changed | Physics Letters B 816 (2021) 136218 | 10.1016/j.physletb.2021.136218 | null | hep-ph | http://creativecommons.org/licenses/by/4.0/ | We present a complete analytical solution to the quantum problem of a
particle in the Yukawa potential, using supersymmetry and a systematic
expansion of the corresponding super-potentials. Results for the critical
screening of the ground state improve in several figures existing results based
on both numerical solutions and approximation methods. Our calculation to order
$(a_{0}/D)^{2}$ for the squared ground state wavefunction at the origin, which
enter in darkonium transitions, yields a correction of $\pi^{4}/216$ to results
based on variational techniques.
| [
{
"created": "Wed, 23 Dec 2020 20:54:10 GMT",
"version": "v1"
},
{
"created": "Sat, 20 Mar 2021 14:25:39 GMT",
"version": "v2"
}
] | 2021-03-24 | [
[
"Napsuciale",
"M.",
""
],
[
"Rodriguez",
"S.",
""
]
] | We present a complete analytical solution to the quantum problem of a particle in the Yukawa potential, using supersymmetry and a systematic expansion of the corresponding super-potentials. Results for the critical screening of the ground state improve in several figures existing results based on both numerical solutions and approximation methods. Our calculation to order $(a_{0}/D)^{2}$ for the squared ground state wavefunction at the origin, which enter in darkonium transitions, yields a correction of $\pi^{4}/216$ to results based on variational techniques. |
2112.01856 | Rajeev Singh Mr. | Wojciech Florkowski, Radoslaw Ryblewski, Rajeev Singh, and Gabriel
Sophys | Spin polarization dynamics in the non-boost-invariant background | 18 pages; 8 captioned figures; Comments are welcome; Matches with the
published version: Phys. Rev. D 105, 054007 (2022) | Phys. Rev. D 105, 054007 (2022) | 10.1103/PhysRevD.105.054007 | null | hep-ph nucl-th | http://creativecommons.org/licenses/by/4.0/ | Space-time evolution of spin polarization within the framework of
hydrodynamics with spin based on de Groot - van Leeuwen - van Weert forms of
energy-momentum and spin tensors is studied. Due to the non-boost invariant
flow in the system the spin polarization components couple to each other
implying some effects on the spin polarization observables. We study
transverse-momentum and rapidity dependence of mean spin polarization vector
for $\Lambda$ hyperons. Our results show qualitative agreement for rapidity
dependence of the global spin polarization with the experiments and other
models. The quadrupole structure of the longitudinal component at midrapidity
is not found, however, as compared to the results for Bjorken expansion, some
non-trivial signal at forward rapidities is observed.
| [
{
"created": "Fri, 3 Dec 2021 11:20:13 GMT",
"version": "v1"
},
{
"created": "Wed, 9 Mar 2022 16:16:49 GMT",
"version": "v2"
}
] | 2022-03-10 | [
[
"Florkowski",
"Wojciech",
""
],
[
"Ryblewski",
"Radoslaw",
""
],
[
"Singh",
"Rajeev",
""
],
[
"Sophys",
"Gabriel",
""
]
] | Space-time evolution of spin polarization within the framework of hydrodynamics with spin based on de Groot - van Leeuwen - van Weert forms of energy-momentum and spin tensors is studied. Due to the non-boost invariant flow in the system the spin polarization components couple to each other implying some effects on the spin polarization observables. We study transverse-momentum and rapidity dependence of mean spin polarization vector for $\Lambda$ hyperons. Our results show qualitative agreement for rapidity dependence of the global spin polarization with the experiments and other models. The quadrupole structure of the longitudinal component at midrapidity is not found, however, as compared to the results for Bjorken expansion, some non-trivial signal at forward rapidities is observed. |
1802.04493 | Harleen Dahiya Dr. | Nisha Dhiman and Harleen Dahiya | Ratios of vector and pseudoscalar $B$ meson decay constants in the
light-cone quark model | 4 pages, 2 figures. Prepared for proceedings of Light Cone Conference
2017 held in Mumbai September 18-22, 2017. To appear in Few Body Systems | Few Body Syst. 59, 30 (2018) | 10.1007/s00601-018-1351-5 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the decay constants of pseudoscalar and vector $B$ meson in the
framework of light-cone quark model (LCQM). We apply the variational method to
the relativistic Hamiltonian with the Gaussian-type trial wave function to
obtain the values of $\beta$ (scale parameter). Then with the help of known
values of constituent quark masses, we obtain the numerical results for the
decay constants $f_P$ and $f_V$, respectively. We compare our numerical results
with the existing experimental data.
| [
{
"created": "Tue, 13 Feb 2018 07:55:24 GMT",
"version": "v1"
},
{
"created": "Thu, 22 Feb 2018 07:08:50 GMT",
"version": "v2"
}
] | 2018-04-04 | [
[
"Dhiman",
"Nisha",
""
],
[
"Dahiya",
"Harleen",
""
]
] | We study the decay constants of pseudoscalar and vector $B$ meson in the framework of light-cone quark model (LCQM). We apply the variational method to the relativistic Hamiltonian with the Gaussian-type trial wave function to obtain the values of $\beta$ (scale parameter). Then with the help of known values of constituent quark masses, we obtain the numerical results for the decay constants $f_P$ and $f_V$, respectively. We compare our numerical results with the existing experimental data. |
2212.07822 | Emmanouil Koutsangelas | Emmanouil Koutsangelas | Removing the Cosmological Bound on the Axion Scale in the KSVZ and DFSZ
Models | 13 pages, 6 figures | null | 10.1103/PhysRevD.107.095009 | null | hep-ph astro-ph.CO | http://creativecommons.org/licenses/by-nc-nd/4.0/ | It is known for some time that the cosmological bound on the invisible axion
scale can be avoided by an early phase of strong QCD. While most approaches
rely on theories where the strong coupling constant is determined through the
expectation value of some scalar field, we show that this mechanism can also be
implemented into the benchmark KSVZ and DFSZ models when the early phase of
strong QCD emerges by the modification of the running coupling during
inflation. For both models the physics that are responsible for making QCD
strong do not displace the axions minimum by too much, so that the efficiency
of the relaxation is controlled by parameters of the theory and the number of
inflationary e-folds. In particular, we consider the case of very efficient
relaxation where the axion abundance is dominated by inflationary quantum and
post-inflationary thermal fluctuations. Within this situation we identify the
parameter space compatible with all cosmological constrains and derive
conditions on the reheating temperature and the QCD scale during inflation that
result in the axion making up all the dark matter. Due to duality below the
Peccei-Quinn scale and a minor influence of the KSVZ and DFSZ fields on the
running, our findings also apply to a minimal 2-form implementation of the
axion.
| [
{
"created": "Thu, 15 Dec 2022 13:35:37 GMT",
"version": "v1"
},
{
"created": "Wed, 10 May 2023 14:26:43 GMT",
"version": "v2"
}
] | 2023-05-11 | [
[
"Koutsangelas",
"Emmanouil",
""
]
] | It is known for some time that the cosmological bound on the invisible axion scale can be avoided by an early phase of strong QCD. While most approaches rely on theories where the strong coupling constant is determined through the expectation value of some scalar field, we show that this mechanism can also be implemented into the benchmark KSVZ and DFSZ models when the early phase of strong QCD emerges by the modification of the running coupling during inflation. For both models the physics that are responsible for making QCD strong do not displace the axions minimum by too much, so that the efficiency of the relaxation is controlled by parameters of the theory and the number of inflationary e-folds. In particular, we consider the case of very efficient relaxation where the axion abundance is dominated by inflationary quantum and post-inflationary thermal fluctuations. Within this situation we identify the parameter space compatible with all cosmological constrains and derive conditions on the reheating temperature and the QCD scale during inflation that result in the axion making up all the dark matter. Due to duality below the Peccei-Quinn scale and a minor influence of the KSVZ and DFSZ fields on the running, our findings also apply to a minimal 2-form implementation of the axion. |
1405.6056 | Sreerup Raychaudhuri | Sudhansu S. Biswal, Monalisa Patra, Sreerup Raychaudhuri | Anomalous Triple Gauge Vertices at the Large Hadron-Electron Collider | 11 pages, LaTeX2e, 5 EPS figures | null | null | TIFR-TH/14-15 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | At a high energy $ep$ collider, such as the Large Hadron-Electron Collider
(LHeC) which is being planned at CERN, one can access the $WW\gamma$ vertex
exclusively in charged current events with a radiated photon, with no
interference from the $WWZ$ vertex. We find that the azimuthal angle between
the jet and the missing momentum in each charged current event is a sensitive
probe of anomalous $WW\gamma$ couplings, and show that for quite reasonable
values of integrated luminosity, the LHeC can extend the discovery reach for
these couplings beyond all present experimental bounds.
| [
{
"created": "Fri, 23 May 2014 13:12:30 GMT",
"version": "v1"
}
] | 2014-05-26 | [
[
"Biswal",
"Sudhansu S.",
""
],
[
"Patra",
"Monalisa",
""
],
[
"Raychaudhuri",
"Sreerup",
""
]
] | At a high energy $ep$ collider, such as the Large Hadron-Electron Collider (LHeC) which is being planned at CERN, one can access the $WW\gamma$ vertex exclusively in charged current events with a radiated photon, with no interference from the $WWZ$ vertex. We find that the azimuthal angle between the jet and the missing momentum in each charged current event is a sensitive probe of anomalous $WW\gamma$ couplings, and show that for quite reasonable values of integrated luminosity, the LHeC can extend the discovery reach for these couplings beyond all present experimental bounds. |
0705.4665 | Andrea Lionetto | A. M. Lionetto | Non Thermal Neutralino Production in Deflected Anomaly Mediation | revtex4, 3 eps figures | null | null | null | hep-ph astro-ph | null | We study the effects of a non thermal neutralino production, due to the late
decay in the early universe of a single modulus field, in the context of the
deflected anomaly mediated scenario. In the regime in which the average number
of neutralino produced in each modulus decaying process is $\bar{N}_{{\rm
LSP}}\ll 1$ also models with a thermal relic density below WMAP data became
acceptable models. We find out that these models belong to three different
classes with the common feature that the low thermal relic density is entirely
due to coannihilation effects. The neutralino annihilation cross section for
these classes of models is not particularly high compared with the highest
cross sections attainable in the generic framework of the MSSM. Hence the
detection prospects either by direct or indirect WIMP search experiments are
not encouraging.
| [
{
"created": "Thu, 31 May 2007 17:50:30 GMT",
"version": "v1"
}
] | 2007-06-01 | [
[
"Lionetto",
"A. M.",
""
]
] | We study the effects of a non thermal neutralino production, due to the late decay in the early universe of a single modulus field, in the context of the deflected anomaly mediated scenario. In the regime in which the average number of neutralino produced in each modulus decaying process is $\bar{N}_{{\rm LSP}}\ll 1$ also models with a thermal relic density below WMAP data became acceptable models. We find out that these models belong to three different classes with the common feature that the low thermal relic density is entirely due to coannihilation effects. The neutralino annihilation cross section for these classes of models is not particularly high compared with the highest cross sections attainable in the generic framework of the MSSM. Hence the detection prospects either by direct or indirect WIMP search experiments are not encouraging. |
1705.09573 | A. N. Ivanov | A. N. Ivanov | Comment on "On the implementation of CVC in weak charged-current
proton-neutron transitions" by C. Giunti, arXiv: 1602.00215 [hep-ph] | 3 pages, no figures | null | null | null | hep-ph astro-ph.CO hep-ex nucl-ex nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We show that the term maintaining conservation of the charged vector current
for the transitions "neutron <-> proton" even for different masses of the
neutron and proton (see T. Leitner et al., Phys. Rev. C {\bf 73}, 065502 (2006)
and A. M. Ankowski, arXiv:1601.06169 [hep-ph]) is related to the first class
current contribution but not to the second class one as has been pointed out by
C. Giunti, arXiv: 1602.00215 [hep-ph].
| [
{
"created": "Fri, 26 May 2017 13:07:45 GMT",
"version": "v1"
}
] | 2017-05-30 | [
[
"Ivanov",
"A. N.",
""
]
] | We show that the term maintaining conservation of the charged vector current for the transitions "neutron <-> proton" even for different masses of the neutron and proton (see T. Leitner et al., Phys. Rev. C {\bf 73}, 065502 (2006) and A. M. Ankowski, arXiv:1601.06169 [hep-ph]) is related to the first class current contribution but not to the second class one as has been pointed out by C. Giunti, arXiv: 1602.00215 [hep-ph]. |
2109.13272 | Renan Picoreti | R. Picoreti, D. Pramanik, P. C. de Holanda, O. L. G. Peres | Updating $\nu_{3}$ lifetime from solar antineutrino spectra | 6 pages, 4 figures | Phys. Rev. D 106, 015025, 2022 | 10.1103/PhysRevD.106.015025 | null | hep-ph | http://creativecommons.org/licenses/by/4.0/ | We study the production of antineutrinos from the solar neutrinos due the
Majorana neutrino decays of neutrino to antineutrino. Using the antineutrino
spectra from KamLAND and Borexino, we present newest limits on the lifetime of
$\nu_{3}$ in this scenario. We consider $\nu_{3} \rightarrow \bar{\nu}_{1} + X$
and $\nu_{3} \rightarrow \bar{\nu}_{2} + X$ channels assuming scalar or
pseudo-scalar interactions. For hierarchical mass-splittings, the limits
obtained by us are $\tau_{3}/m_{3}~\geq 7\times 10^{-5} s/eV$ and
$\tau_{3}/m_{3}~\geq 1\times 10^{-5} s/eV$ for the two channels at $90\%$ C.L.
We found that the newest bound is five orders of magnitude better than the
atmospheric and long-baseline bounds.
| [
{
"created": "Mon, 27 Sep 2021 18:01:04 GMT",
"version": "v1"
},
{
"created": "Wed, 8 Dec 2021 13:25:54 GMT",
"version": "v2"
}
] | 2022-07-27 | [
[
"Picoreti",
"R.",
""
],
[
"Pramanik",
"D.",
""
],
[
"de Holanda",
"P. C.",
""
],
[
"Peres",
"O. L. G.",
""
]
] | We study the production of antineutrinos from the solar neutrinos due the Majorana neutrino decays of neutrino to antineutrino. Using the antineutrino spectra from KamLAND and Borexino, we present newest limits on the lifetime of $\nu_{3}$ in this scenario. We consider $\nu_{3} \rightarrow \bar{\nu}_{1} + X$ and $\nu_{3} \rightarrow \bar{\nu}_{2} + X$ channels assuming scalar or pseudo-scalar interactions. For hierarchical mass-splittings, the limits obtained by us are $\tau_{3}/m_{3}~\geq 7\times 10^{-5} s/eV$ and $\tau_{3}/m_{3}~\geq 1\times 10^{-5} s/eV$ for the two channels at $90\%$ C.L. We found that the newest bound is five orders of magnitude better than the atmospheric and long-baseline bounds. |
2203.09624 | Sokratis Trifinopoulos | Sokratis Trifinopoulos | Explaining Flavour Anomalies with Heavy Scalars | 7 pages, 2 figures, 1 table; contribution to Corfu Summer Institute
2021 "School and Workshops on Elementary Particle Physics and Gravity" | null | null | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Discrepancies between recent experimental results and their respective
Standard Model predictions, known as flavour anomalies, are reported in
semileptonic charged and neutral-current $B$-decays, the muon magnetic moment
$(g-2)_\mu$, and the extraction of the Cabibbo angle. In this proceedings, we
review two New Physics models that introduce two scalar mediators at the TeV
scale and aim at a combined explanation of the flavour anomalies. The first
model features the leptoquarks $S_1$ and $S_3$ and provides tree level
solutions to both $B$-anomalies and one-loop level solution to the anomalous
$(g-2)_\mu$. The second features the leptoquark $S_1$ and the charged singlet
$\phi^+$. While $S_1$ provides the same solution to the charged-current
$B$-anomaly and $(g-2)_\mu$ as in the first model, $\phi^+$ can accommodate the
Cabibbo-angle anomaly independently and together with $S_1$ can resolve the
neutral-current $B$-anomaly at one-loop.
| [
{
"created": "Thu, 17 Mar 2022 21:31:04 GMT",
"version": "v1"
},
{
"created": "Mon, 28 Mar 2022 12:27:40 GMT",
"version": "v2"
}
] | 2022-03-29 | [
[
"Trifinopoulos",
"Sokratis",
""
]
] | Discrepancies between recent experimental results and their respective Standard Model predictions, known as flavour anomalies, are reported in semileptonic charged and neutral-current $B$-decays, the muon magnetic moment $(g-2)_\mu$, and the extraction of the Cabibbo angle. In this proceedings, we review two New Physics models that introduce two scalar mediators at the TeV scale and aim at a combined explanation of the flavour anomalies. The first model features the leptoquarks $S_1$ and $S_3$ and provides tree level solutions to both $B$-anomalies and one-loop level solution to the anomalous $(g-2)_\mu$. The second features the leptoquark $S_1$ and the charged singlet $\phi^+$. While $S_1$ provides the same solution to the charged-current $B$-anomaly and $(g-2)_\mu$ as in the first model, $\phi^+$ can accommodate the Cabibbo-angle anomaly independently and together with $S_1$ can resolve the neutral-current $B$-anomaly at one-loop. |
1109.2604 | Timothy Cohen | Timothy Cohen, John Kearney, Aaron Pierce, and David Tucker-Smith | Singlet-Doublet Dark Matter | 32 pages, 10 figures; v2 minor changes, references added | null | 10.1103/PhysRevD.85.075003 | MCTP-11-33; SLAC-PUB-14584 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In light of recent data from direct detection experiments and the Large
Hadron Collider, we explore models of dark matter in which an SU(2) doublet is
mixed with a Standard Model singlet. We impose a thermal history. If the new
particles are fermions, this model is already constrained due to null results
from XENON100. We comment on remaining regions of parameter space and assess
prospects for future discovery. We do the same for the model where the new
particles are scalars, which at present is less constrained. Much of the
remaining parameter space for both models will be probed by the next generation
of direct detection experiments. For the fermion model, DeepCore may also play
an important role.
| [
{
"created": "Mon, 12 Sep 2011 20:00:47 GMT",
"version": "v1"
},
{
"created": "Wed, 9 Nov 2011 05:32:25 GMT",
"version": "v2"
}
] | 2013-05-30 | [
[
"Cohen",
"Timothy",
""
],
[
"Kearney",
"John",
""
],
[
"Pierce",
"Aaron",
""
],
[
"Tucker-Smith",
"David",
""
]
] | In light of recent data from direct detection experiments and the Large Hadron Collider, we explore models of dark matter in which an SU(2) doublet is mixed with a Standard Model singlet. We impose a thermal history. If the new particles are fermions, this model is already constrained due to null results from XENON100. We comment on remaining regions of parameter space and assess prospects for future discovery. We do the same for the model where the new particles are scalars, which at present is less constrained. Much of the remaining parameter space for both models will be probed by the next generation of direct detection experiments. For the fermion model, DeepCore may also play an important role. |
1601.02949 | Andreas Maier | Martin Beneke, Andreas Maier, Jan Piclum, Thomas Rauh | NNNLO determination of the bottom-quark mass from non-relativistic sum
rules | 8 pages, 4 figures, to appear in the proceedings of the 12th
International Symposium on Radiative Corrections (Radcor 2015) and LoopFest
XIV (Radiative Corrections for the LHC and Future Colliders) | null | null | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The mass of the bottom quark can be determined with high precision from
moments of the pair-production cross section sigma(e+ e- -> b bbar) near
threshold. We present the first complete NNNLO determination from
non-relativistic sum rules, obtaining a bottom-quark mass of mb^PS(2 GeV) =
(4.532 +0.013 -0.039) GeV in the potential-subtracted scheme. For the mass in
the MSbar scheme we find mb^MS(mb^MS) = (4.203 +0.016 -0.034) GeV using the
recently computed four-loop correction to the scheme conversion.
| [
{
"created": "Tue, 12 Jan 2016 16:38:24 GMT",
"version": "v1"
},
{
"created": "Wed, 13 Jan 2016 16:00:31 GMT",
"version": "v2"
}
] | 2016-01-14 | [
[
"Beneke",
"Martin",
""
],
[
"Maier",
"Andreas",
""
],
[
"Piclum",
"Jan",
""
],
[
"Rauh",
"Thomas",
""
]
] | The mass of the bottom quark can be determined with high precision from moments of the pair-production cross section sigma(e+ e- -> b bbar) near threshold. We present the first complete NNNLO determination from non-relativistic sum rules, obtaining a bottom-quark mass of mb^PS(2 GeV) = (4.532 +0.013 -0.039) GeV in the potential-subtracted scheme. For the mass in the MSbar scheme we find mb^MS(mb^MS) = (4.203 +0.016 -0.034) GeV using the recently computed four-loop correction to the scheme conversion. |
2110.11366 | Jes\'us Alejandro Miranda Hern\'andez | Alejandro Miranda, Pablo Roig, Pablo Sanchez-Puertas | Axial-vector exchange contribution to the Hyperfine Splitting | 15 pages +references, 2 figures, 4 tables. Matches published version | Phys. Rev. D 105, 016017 (2022) | 10.1103/PhysRevD.105.016017 | null | hep-ph | http://creativecommons.org/licenses/by/4.0/ | We revisit the contribution of axial-vector mesons to the hyperfine splitting
of muonic hydrogen. We focus our attention on the doubly-virtual asymptotic
behavior of the relevant form factors of axial-vector mesons, together with
their coupling to nucleons based on resonance saturation and short-distance
constraints. Among others, we find significant differences with respect to
previous studies, including an opposite sign and a $\sim50\%$ effect of the
doubly-virtual high-energy behavior.
| [
{
"created": "Thu, 21 Oct 2021 18:00:01 GMT",
"version": "v1"
},
{
"created": "Wed, 26 Jan 2022 03:49:42 GMT",
"version": "v2"
}
] | 2022-01-27 | [
[
"Miranda",
"Alejandro",
""
],
[
"Roig",
"Pablo",
""
],
[
"Sanchez-Puertas",
"Pablo",
""
]
] | We revisit the contribution of axial-vector mesons to the hyperfine splitting of muonic hydrogen. We focus our attention on the doubly-virtual asymptotic behavior of the relevant form factors of axial-vector mesons, together with their coupling to nucleons based on resonance saturation and short-distance constraints. Among others, we find significant differences with respect to previous studies, including an opposite sign and a $\sim50\%$ effect of the doubly-virtual high-energy behavior. |
hep-ph/0311281 | Magno Machado | M.V.T. Machado | Ultrahigh energy neutrinos and non-linear QCD dynamics | 5 pages, 2 figures. Version to be published in Physical Review D | Phys.Rev.D70:053008,2004 | 10.1103/PhysRevD.70.053008 | null | hep-ph astro-ph | null | The ultrahigh energy neutrino-nucleon cross sections are computed taking into
account different phenomenological implementations of the non-linear QCD
dynamic s. Based on the color dipole framework, the results for the saturation
model supplemented by DGLAP evolution as well as for the BFKL formalism in the
geometric scaling regime are presented. They are contrasted with recent
calculations using NLO DGLAP and unified BFKL-DGLAP formalisms.
| [
{
"created": "Fri, 21 Nov 2003 15:51:17 GMT",
"version": "v1"
},
{
"created": "Sat, 24 Jul 2004 18:19:25 GMT",
"version": "v2"
}
] | 2014-11-17 | [
[
"Machado",
"M. V. T.",
""
]
] | The ultrahigh energy neutrino-nucleon cross sections are computed taking into account different phenomenological implementations of the non-linear QCD dynamic s. Based on the color dipole framework, the results for the saturation model supplemented by DGLAP evolution as well as for the BFKL formalism in the geometric scaling regime are presented. They are contrasted with recent calculations using NLO DGLAP and unified BFKL-DGLAP formalisms. |
2301.02485 | Yasuki Tachibana | Y. Tachibana, A. Kumar, A. Majumder, A. Angerami, R. Arora, S. A.
Bass, S. Cao, Y. Chen, T. Dai, L. Du, R. Ehlers, H. Elfner, W. Fan, R. J.
Fries, C. Gale, Y. He, M. Heffernan, U. Heinz, B. V. Jacak, P. M. Jacobs, S.
Jeon, Y. Ji, K. Kauder, L. Kasper, W. Ke, M. Kelsey, M. Kordell II, J.
Latessa, Y.-J. Lee, D. Liyanage, A. Lopez, M. Luzum, S. Mak, A. Mankolli, C.
Martin, H. Mehryar, T. Mengel, J. Mulligan, C. Nattrass, D. Oliinychenko,
J.-F. Paquet, J. H. Putschke, G. Roland, B. Schenke, L. Schwiebert, A.
Sengupta, C. Shen, A. Silva, C. Sirimanna, D. Soeder, R. A. Soltz, I. Soudi,
J. Staudenmaier, M. Strickland, J. Velkovska, G. Vujanovic, X.-N. Wang, R. L.
Wolpert, W. Zhao (the JETSCAPE Collaboration) | Hard Jet Substructure in a Multi-stage Approach | 20 pages, 12 figures | null | null | null | hep-ph hep-ex nucl-ex nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present predictions and postdictions for a wide variety of hard
jet-substructure observables using a multi-stage model within the JETSCAPE
framework. The details of the multi-stage model and the various parameter
choices are described in [A. Kumar et al., arXiv:2204.01163]. A novel feature
of this model is the presence of two stages of jet modification: a high
virtuality phase (modeled using MATTER), where coherence effects diminish
medium-induced radiation, and a lower virtuality phase (modeled using LBT),
where parton splits are fully resolved by the medium as they endure multiple
scattering induced energy loss. Energy loss calculations are carried out on
event-by-event viscous fluid dynamic backgrounds constrained by experimental
data. The uniformed and consistent descriptions of multiple experimental
observables demonstrate the essential role of coherence effects and the
multi-stage modeling of the jet evolution. Using the best choice of parameters
from [A. Kumar et al., arXiv:2204.01163], and with no further tuning, we
present calculations for the medium modified jet fragmentation function, the
groomed jet momentum fraction $z_g$ and angular separation $r_g$ distributions,
as well as the nuclear modification factor of groomed jets. These calculations
provide accurate descriptions of published and preliminary data from
experiments at RHIC and LHC. Furthermore, we provide predictions from the
multi-stage model for future measurements at RHIC.
| [
{
"created": "Fri, 6 Jan 2023 12:45:30 GMT",
"version": "v1"
}
] | 2023-01-09 | [
[
"Tachibana",
"Y.",
"",
"the JETSCAPE Collaboration"
],
[
"Kumar",
"A.",
"",
"the JETSCAPE Collaboration"
],
[
"Majumder",
"A.",
"",
"the JETSCAPE Collaboration"
],
[
"Angerami",
"A.",
"",
"the JETSCAPE Collaboration"
],
[
"Arora",
"R.",
"",
"the JETSCAPE Collaboration"
],
[
"Bass",
"S. A.",
"",
"the JETSCAPE Collaboration"
],
[
"Cao",
"S.",
"",
"the JETSCAPE Collaboration"
],
[
"Chen",
"Y.",
"",
"the JETSCAPE Collaboration"
],
[
"Dai",
"T.",
"",
"the JETSCAPE Collaboration"
],
[
"Du",
"L.",
"",
"the JETSCAPE Collaboration"
],
[
"Ehlers",
"R.",
"",
"the JETSCAPE Collaboration"
],
[
"Elfner",
"H.",
"",
"the JETSCAPE Collaboration"
],
[
"Fan",
"W.",
"",
"the JETSCAPE Collaboration"
],
[
"Fries",
"R. J.",
"",
"the JETSCAPE Collaboration"
],
[
"Gale",
"C.",
"",
"the JETSCAPE Collaboration"
],
[
"He",
"Y.",
"",
"the JETSCAPE Collaboration"
],
[
"Heffernan",
"M.",
"",
"the JETSCAPE Collaboration"
],
[
"Heinz",
"U.",
"",
"the JETSCAPE Collaboration"
],
[
"Jacak",
"B. V.",
"",
"the JETSCAPE Collaboration"
],
[
"Jacobs",
"P. M.",
"",
"the JETSCAPE Collaboration"
],
[
"Jeon",
"S.",
"",
"the JETSCAPE Collaboration"
],
[
"Ji",
"Y.",
"",
"the JETSCAPE Collaboration"
],
[
"Kauder",
"K.",
"",
"the JETSCAPE Collaboration"
],
[
"Kasper",
"L.",
"",
"the JETSCAPE Collaboration"
],
[
"Ke",
"W.",
"",
"the JETSCAPE Collaboration"
],
[
"Kelsey",
"M.",
"",
"the JETSCAPE Collaboration"
],
[
"Kordell",
"M.",
"II",
"the JETSCAPE Collaboration"
],
[
"Latessa",
"J.",
"",
"the JETSCAPE Collaboration"
],
[
"Lee",
"Y. -J.",
"",
"the JETSCAPE Collaboration"
],
[
"Liyanage",
"D.",
"",
"the JETSCAPE Collaboration"
],
[
"Lopez",
"A.",
"",
"the JETSCAPE Collaboration"
],
[
"Luzum",
"M.",
"",
"the JETSCAPE Collaboration"
],
[
"Mak",
"S.",
"",
"the JETSCAPE Collaboration"
],
[
"Mankolli",
"A.",
"",
"the JETSCAPE Collaboration"
],
[
"Martin",
"C.",
"",
"the JETSCAPE Collaboration"
],
[
"Mehryar",
"H.",
"",
"the JETSCAPE Collaboration"
],
[
"Mengel",
"T.",
"",
"the JETSCAPE Collaboration"
],
[
"Mulligan",
"J.",
"",
"the JETSCAPE Collaboration"
],
[
"Nattrass",
"C.",
"",
"the JETSCAPE Collaboration"
],
[
"Oliinychenko",
"D.",
"",
"the JETSCAPE Collaboration"
],
[
"Paquet",
"J. -F.",
"",
"the JETSCAPE Collaboration"
],
[
"Putschke",
"J. H.",
"",
"the JETSCAPE Collaboration"
],
[
"Roland",
"G.",
"",
"the JETSCAPE Collaboration"
],
[
"Schenke",
"B.",
"",
"the JETSCAPE Collaboration"
],
[
"Schwiebert",
"L.",
"",
"the JETSCAPE Collaboration"
],
[
"Sengupta",
"A.",
"",
"the JETSCAPE Collaboration"
],
[
"Shen",
"C.",
"",
"the JETSCAPE Collaboration"
],
[
"Silva",
"A.",
"",
"the JETSCAPE Collaboration"
],
[
"Sirimanna",
"C.",
"",
"the JETSCAPE Collaboration"
],
[
"Soeder",
"D.",
"",
"the JETSCAPE Collaboration"
],
[
"Soltz",
"R. A.",
"",
"the JETSCAPE Collaboration"
],
[
"Soudi",
"I.",
"",
"the JETSCAPE Collaboration"
],
[
"Staudenmaier",
"J.",
"",
"the JETSCAPE Collaboration"
],
[
"Strickland",
"M.",
"",
"the JETSCAPE Collaboration"
],
[
"Velkovska",
"J.",
"",
"the JETSCAPE Collaboration"
],
[
"Vujanovic",
"G.",
"",
"the JETSCAPE Collaboration"
],
[
"Wang",
"X. -N.",
"",
"the JETSCAPE Collaboration"
],
[
"Wolpert",
"R. L.",
"",
"the JETSCAPE Collaboration"
],
[
"Zhao",
"W.",
"",
"the JETSCAPE Collaboration"
]
] | We present predictions and postdictions for a wide variety of hard jet-substructure observables using a multi-stage model within the JETSCAPE framework. The details of the multi-stage model and the various parameter choices are described in [A. Kumar et al., arXiv:2204.01163]. A novel feature of this model is the presence of two stages of jet modification: a high virtuality phase (modeled using MATTER), where coherence effects diminish medium-induced radiation, and a lower virtuality phase (modeled using LBT), where parton splits are fully resolved by the medium as they endure multiple scattering induced energy loss. Energy loss calculations are carried out on event-by-event viscous fluid dynamic backgrounds constrained by experimental data. The uniformed and consistent descriptions of multiple experimental observables demonstrate the essential role of coherence effects and the multi-stage modeling of the jet evolution. Using the best choice of parameters from [A. Kumar et al., arXiv:2204.01163], and with no further tuning, we present calculations for the medium modified jet fragmentation function, the groomed jet momentum fraction $z_g$ and angular separation $r_g$ distributions, as well as the nuclear modification factor of groomed jets. These calculations provide accurate descriptions of published and preliminary data from experiments at RHIC and LHC. Furthermore, we provide predictions from the multi-stage model for future measurements at RHIC. |
1002.2653 | Andreas Crivellin | Andreas Crivellin, Momchil Davidkov | Do squarks have to be degenerate? Constraining the mass splitting with
Kaon and D mixing | 7 pages, 3 figures | Phys.Rev.D81:095004,2010 | 10.1103/PhysRevD.81.095004 | TTP10-17 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the constraints on the mass-splitting of the first two generations
of left-handed squarks obtained from Delta M_K, epsilon_K and D mixing. The
different contributions from gluino, neutralino and chargino diagrams are
examined in detail, concluding that it is not justified to neglect electroweak
gaugino diagrams if the squark mass matrices contain flavor non-diagonal LL
elements. We find that the constraints on the mass-splitting are very strong
for light gluino masses. However, if the gluino is heavier than the squarks the
constraints on the mass-splitting are much weaker. There are even large regions
in parameter space where the different NP contributions cancel each other,
leaving the mass-splitting nearly unconstrained.
| [
{
"created": "Fri, 12 Feb 2010 22:42:13 GMT",
"version": "v1"
},
{
"created": "Mon, 10 May 2010 10:18:32 GMT",
"version": "v2"
}
] | 2010-05-25 | [
[
"Crivellin",
"Andreas",
""
],
[
"Davidkov",
"Momchil",
""
]
] | We study the constraints on the mass-splitting of the first two generations of left-handed squarks obtained from Delta M_K, epsilon_K and D mixing. The different contributions from gluino, neutralino and chargino diagrams are examined in detail, concluding that it is not justified to neglect electroweak gaugino diagrams if the squark mass matrices contain flavor non-diagonal LL elements. We find that the constraints on the mass-splitting are very strong for light gluino masses. However, if the gluino is heavier than the squarks the constraints on the mass-splitting are much weaker. There are even large regions in parameter space where the different NP contributions cancel each other, leaving the mass-splitting nearly unconstrained. |
2006.06726 | A H Ajjath | A.H. Ajjath, Pooja Mukherjee and V. Ravindran | On next to soft corrections to Drell-Yan and Higgs Boson productions | 55 Pages, 3 Tables | null | 10.1103/PhysRevD.105.094035 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present a framework that resums threshold enhanced large logarithms to all
orders in perturbation theory for the production of a pair of leptons in
Drell-Yan process and of Higgs boson in gluon fusion as well as in bottom quark
annihilation. We restrict ourselves to contributions from diagonal partonic
channels. These logarithms include the distributions $((1-z)^{-1}
\ln^i(1-z))_+$ resulting from soft plus virtual (SV) and the logarithms
$\ln^i(1-z)$ from next-to-SV (NSV) contributions. We use collinear
factorisation and renormalisation group invariance to achieve this. The former
allows one to define a Soft-Collinear (SC) function which encapsulates soft and
collinear dynamics of the perturbative results to all orders in strong coupling
constant. The logarithmic structure of these results are governed by universal
infrared anomalous dimensions and process dependent functions of Sudakov
differential equation that the SC satisfies. The solution to the differential
equation is obtained by proposing an all-order ansatz in dimensional
regularisation, owing to several state-of-the-art perturbative results
available to third order. The $z$ space solutions thus obtained provide an
integral representation to sum up large logarithms originating from both soft
and collinear configurations, conveniently in Mellin $N$ space. We show that in
$N$ space, tower of logarithms $a_s^n/N^\alpha \ln^{2n-\alpha} (N),
a_s^n/N^\alpha \ln^{2n-1-\alpha}(N) \cdots $ etc for $\alpha =0,1$ are summed
to all orders in $a_s$.
| [
{
"created": "Thu, 11 Jun 2020 18:33:56 GMT",
"version": "v1"
},
{
"created": "Tue, 20 Jul 2021 16:36:50 GMT",
"version": "v2"
}
] | 2022-05-31 | [
[
"Ajjath",
"A. H.",
""
],
[
"Mukherjee",
"Pooja",
""
],
[
"Ravindran",
"V.",
""
]
] | We present a framework that resums threshold enhanced large logarithms to all orders in perturbation theory for the production of a pair of leptons in Drell-Yan process and of Higgs boson in gluon fusion as well as in bottom quark annihilation. We restrict ourselves to contributions from diagonal partonic channels. These logarithms include the distributions $((1-z)^{-1} \ln^i(1-z))_+$ resulting from soft plus virtual (SV) and the logarithms $\ln^i(1-z)$ from next-to-SV (NSV) contributions. We use collinear factorisation and renormalisation group invariance to achieve this. The former allows one to define a Soft-Collinear (SC) function which encapsulates soft and collinear dynamics of the perturbative results to all orders in strong coupling constant. The logarithmic structure of these results are governed by universal infrared anomalous dimensions and process dependent functions of Sudakov differential equation that the SC satisfies. The solution to the differential equation is obtained by proposing an all-order ansatz in dimensional regularisation, owing to several state-of-the-art perturbative results available to third order. The $z$ space solutions thus obtained provide an integral representation to sum up large logarithms originating from both soft and collinear configurations, conveniently in Mellin $N$ space. We show that in $N$ space, tower of logarithms $a_s^n/N^\alpha \ln^{2n-\alpha} (N), a_s^n/N^\alpha \ln^{2n-1-\alpha}(N) \cdots $ etc for $\alpha =0,1$ are summed to all orders in $a_s$. |
hep-ph/0512010 | Takuya Morozumi | T. Fujihara, S. K. Kang, C. S. Kim, D. Kimura, T. Morozumi | Low scale Seesaw model and Lepton Flavor Violating Rare B Decays | 19 pages, 6 figures | Phys.Rev. D73 (2006) 074011 | 10.1103/PhysRevD.73.074011 | HUPD 0507 | hep-ph | null | We study lepton flavor number violating rare B decays, $b \to s l_h^{\pm}
l_l^{\mp}$, in a seesaw model with low scale singlet Majorana neutrinos
motivated by the resonant leptogenesis scenario. The branching ratios of
inclusive decays $ b \to s l_h^{\pm} \bar{l_l}^{\mp} $ with two almost
degenerate singlet neutrinos at TeV scale are investigated in detail. We find
that there exists a class of seesaw model in which the branching fractions of $
b \to s \tau \mu $ and $\tau \to \mu \gamma$ can be as large as $10^{-10}$ and
$10^{-9}$ within the reach of Super B factories, respectively, without being in
conflict with neutrino mixings and mass squared difference of neutrinos from
neutrino data, invisible decay width of $Z$ and the present limit of $Br(\mu
\to e \gamma)$.
| [
{
"created": "Fri, 2 Dec 2005 06:37:05 GMT",
"version": "v1"
},
{
"created": "Fri, 9 Dec 2005 04:34:23 GMT",
"version": "v2"
}
] | 2009-11-11 | [
[
"Fujihara",
"T.",
""
],
[
"Kang",
"S. K.",
""
],
[
"Kim",
"C. S.",
""
],
[
"Kimura",
"D.",
""
],
[
"Morozumi",
"T.",
""
]
] | We study lepton flavor number violating rare B decays, $b \to s l_h^{\pm} l_l^{\mp}$, in a seesaw model with low scale singlet Majorana neutrinos motivated by the resonant leptogenesis scenario. The branching ratios of inclusive decays $ b \to s l_h^{\pm} \bar{l_l}^{\mp} $ with two almost degenerate singlet neutrinos at TeV scale are investigated in detail. We find that there exists a class of seesaw model in which the branching fractions of $ b \to s \tau \mu $ and $\tau \to \mu \gamma$ can be as large as $10^{-10}$ and $10^{-9}$ within the reach of Super B factories, respectively, without being in conflict with neutrino mixings and mass squared difference of neutrinos from neutrino data, invisible decay width of $Z$ and the present limit of $Br(\mu \to e \gamma)$. |
hep-ph/0102329 | Alexander Kovner | Alex Kovner (CERN and Plymouth U.) | Z(N) wall junctions: Monopole fossils in hot QCD | 10 pages, Latex | Phys.Lett. B509 (2001) 106-110 | 10.1016/S0370-2693(01)00479-8 | CERN-TH/2001-063 | hep-ph hep-lat | null | We point out that the effective action of hot Yang--Mills theories has
semi-classical solutions, which are naturally identified with monopole world
lines, ``frozen'' into the short imaginary time dimension. The solutions look
like wall junctions: lines along which N electric Z(N) domain walls come
together. They are instrumental in reconciling explicit perturbative
calculations at high temperature with the magnetic Z(N) symmetry.
| [
{
"created": "Tue, 27 Feb 2001 15:40:37 GMT",
"version": "v1"
}
] | 2009-11-07 | [
[
"Kovner",
"Alex",
"",
"CERN and Plymouth U."
]
] | We point out that the effective action of hot Yang--Mills theories has semi-classical solutions, which are naturally identified with monopole world lines, ``frozen'' into the short imaginary time dimension. The solutions look like wall junctions: lines along which N electric Z(N) domain walls come together. They are instrumental in reconciling explicit perturbative calculations at high temperature with the magnetic Z(N) symmetry. |
2306.07334 | Bowen Fu | Bowen Fu, Anish Ghoshal and Steve King | Cosmic string gravitational waves from global $U(1)_{B-L}$ symmetry
breaking as a probe of the type I seesaw scale | 27 pages including references, 3 figures, comments are welcome | JHEP 11 (2023) 071 | 10.1007/JHEP11(2023)071 | null | hep-ph astro-ph.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In type I seesaw models, the right-handed neutrinos are typically
super-heavy, consistent with the generation of baryon asymmetry via standard
leptogenesis. Primordial gravitational waves of cosmological origin provides a
new window to probe such high scale physics, which would otherwise be
inaccessible. By considering a {\em global} $U(1)_{B-L}$ extension of the type
I seesaw model, we explore the connection between the heaviest right-handed
neutrino mass and primordial gravitational waves arising from the dynamics of
global cosmic string network. As a concrete example, we study a global
$U(1)_{B-L}$ extension of the Littlest Seesaw model, and show that the
inevitable GW signals, if detectable, probe the parameter space that can
accommodate neutrino oscillation data and successful leptogenesis, while
respecting theoretical constraints like perturbativity of the theory. Including
CMB constraints from polarization and dark radiation leaves a large region of
parameter space of the model, including the best fit regions, which can be
probed by GW detectors like LISA and ET in the near future. In general, the GW
detectors can test high scale type I seesaw models with the heaviest
right-handed neutrino mass above $2.5 \times 10^{14}$ GeV, assuming the
perturbativity, and $7 \times 10^{13}$ GeV assuming that the coupling between
the heaviest right-handed neutrino and the $U(1)_{B-L}$ breaking scalar is less
than unity.
| [
{
"created": "Mon, 12 Jun 2023 18:00:20 GMT",
"version": "v1"
},
{
"created": "Sun, 19 Nov 2023 05:48:47 GMT",
"version": "v2"
}
] | 2023-11-21 | [
[
"Fu",
"Bowen",
""
],
[
"Ghoshal",
"Anish",
""
],
[
"King",
"Steve",
""
]
] | In type I seesaw models, the right-handed neutrinos are typically super-heavy, consistent with the generation of baryon asymmetry via standard leptogenesis. Primordial gravitational waves of cosmological origin provides a new window to probe such high scale physics, which would otherwise be inaccessible. By considering a {\em global} $U(1)_{B-L}$ extension of the type I seesaw model, we explore the connection between the heaviest right-handed neutrino mass and primordial gravitational waves arising from the dynamics of global cosmic string network. As a concrete example, we study a global $U(1)_{B-L}$ extension of the Littlest Seesaw model, and show that the inevitable GW signals, if detectable, probe the parameter space that can accommodate neutrino oscillation data and successful leptogenesis, while respecting theoretical constraints like perturbativity of the theory. Including CMB constraints from polarization and dark radiation leaves a large region of parameter space of the model, including the best fit regions, which can be probed by GW detectors like LISA and ET in the near future. In general, the GW detectors can test high scale type I seesaw models with the heaviest right-handed neutrino mass above $2.5 \times 10^{14}$ GeV, assuming the perturbativity, and $7 \times 10^{13}$ GeV assuming that the coupling between the heaviest right-handed neutrino and the $U(1)_{B-L}$ breaking scalar is less than unity. |
2004.00524 | Albi Kerbizi | Albi Kerbizi | Recursive fragmentation of a polarized quark | PhD thesis, University of Trieste, XXXII cycle, academic year
2018-2019. Supervisor: Prof. Anna Martin, Prof. Xavier Artru | null | null | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The thesis is devoted to the study of the fragmentation process of polarized
quarks, and in particular of the Collins effect used for the extraction of the
quark transversity distribution. The aim is to include the spin degree of
freedom in the hadronization part of Monte Carlo event generators by using the
string+${}^3P_0$ model. The model is reviewed here and the relevant functions
have been written in a form suitable for a Monte Carlo implementation. Two main
variants of the model for pseudoscalar meson production are formulated and both
of them have been implemented in stand alone Monte Carlo programs. After tuning
one single parameter, the simulation results are compared with the measured
Collins and dihadron transverse spin asymmetries showing a satisfactory
qualitative agreement. Given this encouraging outcome, one of them has been
interfaced with the hadronization part of the PYTHIA event generator. The quark
transversity distribution has been implemented in the generator allowing to
simulate for the first time the polarized SIDIS process. The comparison of the
simulated transverse spin asymmetries with the experimental data is found to be
very promising. As final development, vector meson production and decays have
been included in a consistent way with the rules of quantum mechanics. The
effect of vector meson production on transverse spin asymmetries has been
studied in detail with a stand alone Monte Carlo program showing that the new
model is a promising and powerful model for the description of the polarized
quark fragmentation process.
| [
{
"created": "Wed, 1 Apr 2020 15:45:53 GMT",
"version": "v1"
}
] | 2020-04-02 | [
[
"Kerbizi",
"Albi",
""
]
] | The thesis is devoted to the study of the fragmentation process of polarized quarks, and in particular of the Collins effect used for the extraction of the quark transversity distribution. The aim is to include the spin degree of freedom in the hadronization part of Monte Carlo event generators by using the string+${}^3P_0$ model. The model is reviewed here and the relevant functions have been written in a form suitable for a Monte Carlo implementation. Two main variants of the model for pseudoscalar meson production are formulated and both of them have been implemented in stand alone Monte Carlo programs. After tuning one single parameter, the simulation results are compared with the measured Collins and dihadron transverse spin asymmetries showing a satisfactory qualitative agreement. Given this encouraging outcome, one of them has been interfaced with the hadronization part of the PYTHIA event generator. The quark transversity distribution has been implemented in the generator allowing to simulate for the first time the polarized SIDIS process. The comparison of the simulated transverse spin asymmetries with the experimental data is found to be very promising. As final development, vector meson production and decays have been included in a consistent way with the rules of quantum mechanics. The effect of vector meson production on transverse spin asymmetries has been studied in detail with a stand alone Monte Carlo program showing that the new model is a promising and powerful model for the description of the polarized quark fragmentation process. |
1604.06987 | Tripurari Srivastava | J. Chakrabortty, J. Gluza, T. Jelinski, T. Srivastava | Theoretical constraints on masses of heavy particles in Left-Right
Symmetric Models | 9 pages, 5 figures, pdflatex, Matches published version | Phys.Lett. B759 (2016) 361-368 | 10.1016/j.physletb.2016.05.092 | null | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Left-Right symmetric models with general $g_L \neq g_R$ gauge couplings which
include bidoublet and triplet scalar multiplets are studied. Possible scalar
mass spectra are outlined by imposing Tree-Unitarity, and Vacuum Stability
criteria and also using the bounds on neutral scalar masses $M_{\rm H^{ FCNC}}$
which assure the absence of Flavour Changing Neutral Currents (FCNC). We are
focusing on mass spectra relevant for the LHC analysis, i.e., the scalar masses
are around TeV scale. As all non-standard heavy particle masses are related to
the vacuum expectation value (VEV) of the right-handed triplet ($v_R$), the
combined effects of relevant Higgs potential parameters and $M_{\rm H^{ FCNC}}$
regulate the lower limits of heavy gauge boson masses. The complete set of
Renormalization Group Evolutions for all couplings are provided at the 1-loop
level, including the mixing effects in the Yukawa sector. Most of the scalar
couplings suffer from the Landau poles at the intermediate scale $Q \sim
10^{6.5}$ GeV, which in general coincides with violation of the Tree-Unitarity
bounds.
| [
{
"created": "Sun, 24 Apr 2016 05:43:48 GMT",
"version": "v1"
},
{
"created": "Thu, 30 Jun 2016 06:07:15 GMT",
"version": "v2"
}
] | 2016-07-01 | [
[
"Chakrabortty",
"J.",
""
],
[
"Gluza",
"J.",
""
],
[
"Jelinski",
"T.",
""
],
[
"Srivastava",
"T.",
""
]
] | Left-Right symmetric models with general $g_L \neq g_R$ gauge couplings which include bidoublet and triplet scalar multiplets are studied. Possible scalar mass spectra are outlined by imposing Tree-Unitarity, and Vacuum Stability criteria and also using the bounds on neutral scalar masses $M_{\rm H^{ FCNC}}$ which assure the absence of Flavour Changing Neutral Currents (FCNC). We are focusing on mass spectra relevant for the LHC analysis, i.e., the scalar masses are around TeV scale. As all non-standard heavy particle masses are related to the vacuum expectation value (VEV) of the right-handed triplet ($v_R$), the combined effects of relevant Higgs potential parameters and $M_{\rm H^{ FCNC}}$ regulate the lower limits of heavy gauge boson masses. The complete set of Renormalization Group Evolutions for all couplings are provided at the 1-loop level, including the mixing effects in the Yukawa sector. Most of the scalar couplings suffer from the Landau poles at the intermediate scale $Q \sim 10^{6.5}$ GeV, which in general coincides with violation of the Tree-Unitarity bounds. |
hep-ph/9602266 | null | Michael C. Birse (University of Manchester) | What does a change in the quark condensate say about restoration of
chiral symmetry in matter? | 9 pages (RevTeX). Definition of effective mass changed; numerical
value of leading nonanalytic term corrected, along with various misprints | Phys.Rev.C53:2048-2051,1996 | 10.1103/PhysRevC.53.R2048 | MC/TH 96/09 | hep-ph nucl-th | null | The contribution of nucleons to the quark condensate in nuclear matter
includes a piece of first order in $m_\pi$, arising from the contribution of
low-momentum virtual pions to the $\pi N$ sigma commutator. Chiral symmetry
requires that no term of this order appears in the $NN$ interaction. The mass
of a nucleon in matter thus cannot depend in any simple way on the quark
condensate alone. More generally, pieces of the quark condensate that arise
from low-momentum pions should not be associated with partial restoration of
chiral symmetry.
| [
{
"created": "Fri, 9 Feb 1996 16:08:37 GMT",
"version": "v1"
},
{
"created": "Wed, 20 Mar 1996 09:29:57 GMT",
"version": "v2"
}
] | 2008-11-26 | [
[
"Birse",
"Michael C.",
"",
"University of Manchester"
]
] | The contribution of nucleons to the quark condensate in nuclear matter includes a piece of first order in $m_\pi$, arising from the contribution of low-momentum virtual pions to the $\pi N$ sigma commutator. Chiral symmetry requires that no term of this order appears in the $NN$ interaction. The mass of a nucleon in matter thus cannot depend in any simple way on the quark condensate alone. More generally, pieces of the quark condensate that arise from low-momentum pions should not be associated with partial restoration of chiral symmetry. |
hep-ph/9709346 | Katsuhiko Suzuki | K. Suzuki | Structure of the constituent quark and quark distributions of hadrons | 7 pages, LaTeX, 4 figures are included using epsfig.sty, talk
presented at QULEN97, to appear in the proceedings, Complete PS fils is also
available at http://WWW.physik.tu-muenchen.de/~ksuzuki/publication.html | Nucl.Phys. A629 (1998) 269c-272c | 10.1016/S0375-9474(97)00697-0 | null | hep-ph | null | We study the structure of constituent quarks by dressing bare quarks with the
Goldstone bosons and its implications for quark distribution functions of
hadrons $f_1(x)$, $g_1(x)$ and $h_1(x)$. In particular we discuss effects of
the dressing on the nucleon spin structure, and find that contributions to
chiral-odd $h_1(x)$ is quite different from those to $g_1 (x)$, which can be
measured in the semi-inclusive polarized deep inelastic scattering.
| [
{
"created": "Mon, 15 Sep 1997 15:29:14 GMT",
"version": "v1"
}
] | 2009-10-30 | [
[
"Suzuki",
"K.",
""
]
] | We study the structure of constituent quarks by dressing bare quarks with the Goldstone bosons and its implications for quark distribution functions of hadrons $f_1(x)$, $g_1(x)$ and $h_1(x)$. In particular we discuss effects of the dressing on the nucleon spin structure, and find that contributions to chiral-odd $h_1(x)$ is quite different from those to $g_1 (x)$, which can be measured in the semi-inclusive polarized deep inelastic scattering. |
1501.03699 | Cedric Mezrag | C. Mezrag | Modeling the pion Generalized Parton Distribution | 8 pages, 4 figures, proceeding of the 21st International Symposium on
Spin Physics, October 20-24 2014, Beijing, China | null | 10.1142/S201019451660048X | null | hep-ph nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We compute the pion Generalized Parton Distribution (GPD) in a valence
dressed quarks approach. We model the Mellin moments of the GPD using Ans\"atze
for Green functions inspired by the numerical solutions of the Dyson-Schwinger
Equations (DSE) and the Bethe-Salpeter Equation (BSE). Then, the GPD is
reconstructed from its Mellin moment using the Double Distribution (DD)
formalism. The agreement with available experimental data is very good.
| [
{
"created": "Thu, 15 Jan 2015 14:46:14 GMT",
"version": "v1"
}
] | 2016-03-23 | [
[
"Mezrag",
"C.",
""
]
] | We compute the pion Generalized Parton Distribution (GPD) in a valence dressed quarks approach. We model the Mellin moments of the GPD using Ans\"atze for Green functions inspired by the numerical solutions of the Dyson-Schwinger Equations (DSE) and the Bethe-Salpeter Equation (BSE). Then, the GPD is reconstructed from its Mellin moment using the Double Distribution (DD) formalism. The agreement with available experimental data is very good. |
hep-ph/9707214 | Evan Keith | E. Keith and Ernest Ma | S, T, and Leptoquarks at HERA | 10 pages including 3 figures | Phys.Rev.Lett. 79 (1997) 4318-4320 | 10.1103/PhysRevLett.79.4318 | UCRHEP-T188 | hep-ph | null | If the recently discovered anomalous events at HERA are due to a scalar
leptoquark, then it is very likely to have weak isospin $I = 1/2$. In that
case, present precision measurements of the oblique radiative parameters $S$
and $T$ provide strong constraints on the mass of the other component of this
doublet. If the standard model is extended to include such a doublet, a
slightly better fit may in fact be obtained. However, in specific proposed
models where this doublet comes from a larger symmetry, there are often
additional large and positive contributions to $S$ from exotic heavy fermions
which far exceed the present experimental limit. A way to improve the Tevatron
exploration of leptoquarks is proposed.
| [
{
"created": "Wed, 2 Jul 1997 00:06:49 GMT",
"version": "v1"
}
] | 2009-10-30 | [
[
"Keith",
"E.",
""
],
[
"Ma",
"Ernest",
""
]
] | If the recently discovered anomalous events at HERA are due to a scalar leptoquark, then it is very likely to have weak isospin $I = 1/2$. In that case, present precision measurements of the oblique radiative parameters $S$ and $T$ provide strong constraints on the mass of the other component of this doublet. If the standard model is extended to include such a doublet, a slightly better fit may in fact be obtained. However, in specific proposed models where this doublet comes from a larger symmetry, there are often additional large and positive contributions to $S$ from exotic heavy fermions which far exceed the present experimental limit. A way to improve the Tevatron exploration of leptoquarks is proposed. |
2305.10500 | Shahzar Rizvi | Shahzar Rizvi, Mariel Pettee, Benjamin Nachman | Learning Likelihood Ratios with Neural Network Classifiers | null | null | null | null | hep-ph physics.data-an stat.AP stat.ML | http://creativecommons.org/licenses/by/4.0/ | The likelihood ratio is a crucial quantity for statistical inference in
science that enables hypothesis testing, construction of confidence intervals,
reweighting of distributions, and more. Many modern scientific applications,
however, make use of data- or simulation-driven models for which computing the
likelihood ratio can be very difficult or even impossible. By applying the
so-called ``likelihood ratio trick,'' approximations of the likelihood ratio
may be computed using clever parametrizations of neural network-based
classifiers. A number of different neural network setups can be defined to
satisfy this procedure, each with varying performance in approximating the
likelihood ratio when using finite training data. We present a series of
empirical studies detailing the performance of several common loss functionals
and parametrizations of the classifier output in approximating the likelihood
ratio of two univariate and multivariate Gaussian distributions as well as
simulated high-energy particle physics datasets.
| [
{
"created": "Wed, 17 May 2023 18:11:38 GMT",
"version": "v1"
},
{
"created": "Mon, 8 Jan 2024 21:09:35 GMT",
"version": "v2"
}
] | 2024-01-10 | [
[
"Rizvi",
"Shahzar",
""
],
[
"Pettee",
"Mariel",
""
],
[
"Nachman",
"Benjamin",
""
]
] | The likelihood ratio is a crucial quantity for statistical inference in science that enables hypothesis testing, construction of confidence intervals, reweighting of distributions, and more. Many modern scientific applications, however, make use of data- or simulation-driven models for which computing the likelihood ratio can be very difficult or even impossible. By applying the so-called ``likelihood ratio trick,'' approximations of the likelihood ratio may be computed using clever parametrizations of neural network-based classifiers. A number of different neural network setups can be defined to satisfy this procedure, each with varying performance in approximating the likelihood ratio when using finite training data. We present a series of empirical studies detailing the performance of several common loss functionals and parametrizations of the classifier output in approximating the likelihood ratio of two univariate and multivariate Gaussian distributions as well as simulated high-energy particle physics datasets. |
0801.3777 | Robert Fleischer | Robert Fleischer (CERN) | Prospects for B-Decay Studies at the LHC | 18 pages, 4 figures, invited talk at the 3rd High-Energy Physics
Conference in Madagascar (HEP-MAD 07), 10-15 September 2007, Antananarivo,
Madagascar, to appear in the proceedings | null | null | CERN-PH-TH/2008-016 | hep-ph | null | In this decade, there are huge efforts to explore B-meson decays, which offer
interesting probes to test the quark-flavour structure of the Standard Model
and to search for signals of new physics. Exciting new perspectives for these
studies will soon arise at the LHC, where decays of $B^0_s$ mesons will be a
key target of the B-physics programme. We will discuss theoretical aspects of
various benchmark channels and address the question of how much space for
new-physics effects in their observables is left by the recent experimental
results from the B factories and the Tevatron.
| [
{
"created": "Thu, 24 Jan 2008 15:04:45 GMT",
"version": "v1"
}
] | 2008-01-25 | [
[
"Fleischer",
"Robert",
"",
"CERN"
]
] | In this decade, there are huge efforts to explore B-meson decays, which offer interesting probes to test the quark-flavour structure of the Standard Model and to search for signals of new physics. Exciting new perspectives for these studies will soon arise at the LHC, where decays of $B^0_s$ mesons will be a key target of the B-physics programme. We will discuss theoretical aspects of various benchmark channels and address the question of how much space for new-physics effects in their observables is left by the recent experimental results from the B factories and the Tevatron. |
1307.3249 | Ian Lewis | S. Dawson, Ian M. Lewis, and Mao Zeng | Threshold Resummed and Approximate NNLO results for W+W- Pair Production
at the LHC | 29 pages, 7 figures, 3 tables. Discussion added to introduction,
references updated, and typos corrected | Phys. Rev. D. 88, 054028 (2013) | 10.1103/PhysRevD.88.054028 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The next-to-leading order (NLO) QCD radiative corrections to W+W- production
at hadron colliders are well understood. We combine NLO perturbative QCD
calculations with soft-gluon resummation of threshold logarithms to find a
next-to-next-to leading logarithmic (NNLL) prediction for the total cross
section and the invariant mass distribution at the LHC. We also obtain
approximate next-to-next-to-leading order (NNLO) results for the total W+W-
cross section at the LHC which includes all contributions from the scale
dependent leading singular terms. Our result for the approximate NNLO total
cross section is the most precise theoretical prediction available.
Uncertainties due to scale variation are shown to be small when the threshold
logarithms are included. NNLL threshold resummation increases the W+W-
invariant mass distribution by ~ 3-4% in the peak region for both \sqrt{S}=8
and 14 TeV. The NNLL threshold resummed and approximate NNLO cross sections
increase the NLO cross section by 0.5-3% for \sqrt{S}=7, 8, 13, and 14 TeV.
| [
{
"created": "Thu, 11 Jul 2013 20:00:02 GMT",
"version": "v1"
},
{
"created": "Thu, 19 Sep 2013 22:03:24 GMT",
"version": "v2"
}
] | 2013-09-27 | [
[
"Dawson",
"S.",
""
],
[
"Lewis",
"Ian M.",
""
],
[
"Zeng",
"Mao",
""
]
] | The next-to-leading order (NLO) QCD radiative corrections to W+W- production at hadron colliders are well understood. We combine NLO perturbative QCD calculations with soft-gluon resummation of threshold logarithms to find a next-to-next-to leading logarithmic (NNLL) prediction for the total cross section and the invariant mass distribution at the LHC. We also obtain approximate next-to-next-to-leading order (NNLO) results for the total W+W- cross section at the LHC which includes all contributions from the scale dependent leading singular terms. Our result for the approximate NNLO total cross section is the most precise theoretical prediction available. Uncertainties due to scale variation are shown to be small when the threshold logarithms are included. NNLL threshold resummation increases the W+W- invariant mass distribution by ~ 3-4% in the peak region for both \sqrt{S}=8 and 14 TeV. The NNLL threshold resummed and approximate NNLO cross sections increase the NLO cross section by 0.5-3% for \sqrt{S}=7, 8, 13, and 14 TeV. |
1504.05726 | Toshitaka Uchino | T. Uchino, Wei-Hong Liang and E. Oset | Baryon states with hidden charm in the extended local hidden gauge
approach | 24 pages, 6 figures | null | 10.1140/epja/i2016-16043-0 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The s-wave interaction of $\bar{D} \Lambda_c, \bar{D} \Sigma_c, \bar{D}
\Lambda_c, \bar{D}{}^* \Sigma_c$ and $\bar{D}\Sigma^*_c,
\bar{D}{}^*\Sigma^*_c$, is studied within a unitary coupled channels scheme
with the extended local hidden gauge approach. In addition to the
Weinberg-Tomozawa term, several additional diagrams via the pion-exchange are
also taken into account as box potentials. Furthermore, in order to implement
the full coupled channels calculation, some of the box potentials which mix the
vector-baryon and pseudoscalar-baryon sectors are extended to construct the
effective transition potentials. As a result, we have observed six possible
states in several angular momenta. Four of them correspond to two pairs of
admixture states, two of $\bar{D}\Sigma_c$ - $\bar{D}{}^*\Sigma_c$ with $J^P =
1/2^-$, and two of $\bar{D}\Sigma^*_c$ - $\bar{D}{}^*\Sigma^*_c$ with $J^P =
3/2^-$. Moreover, we find a $\bar{D}{}^* \Sigma_c$ resonance which couples to
the $\bar{D}\Lambda_c$ channel and one spin degenerated bound state of
$\bar{D}{}^*\Sigma^*_c$ with $J^P = 1/2^-, 5/2^-$.
| [
{
"created": "Wed, 22 Apr 2015 10:53:01 GMT",
"version": "v1"
}
] | 2016-03-23 | [
[
"Uchino",
"T.",
""
],
[
"Liang",
"Wei-Hong",
""
],
[
"Oset",
"E.",
""
]
] | The s-wave interaction of $\bar{D} \Lambda_c, \bar{D} \Sigma_c, \bar{D} \Lambda_c, \bar{D}{}^* \Sigma_c$ and $\bar{D}\Sigma^*_c, \bar{D}{}^*\Sigma^*_c$, is studied within a unitary coupled channels scheme with the extended local hidden gauge approach. In addition to the Weinberg-Tomozawa term, several additional diagrams via the pion-exchange are also taken into account as box potentials. Furthermore, in order to implement the full coupled channels calculation, some of the box potentials which mix the vector-baryon and pseudoscalar-baryon sectors are extended to construct the effective transition potentials. As a result, we have observed six possible states in several angular momenta. Four of them correspond to two pairs of admixture states, two of $\bar{D}\Sigma_c$ - $\bar{D}{}^*\Sigma_c$ with $J^P = 1/2^-$, and two of $\bar{D}\Sigma^*_c$ - $\bar{D}{}^*\Sigma^*_c$ with $J^P = 3/2^-$. Moreover, we find a $\bar{D}{}^* \Sigma_c$ resonance which couples to the $\bar{D}\Lambda_c$ channel and one spin degenerated bound state of $\bar{D}{}^*\Sigma^*_c$ with $J^P = 1/2^-, 5/2^-$. |
2109.04814 | Jinbo Yang | Mayumi Aoki, Jisuke Kubo, and Jinbo Yang | Inflation and dark matter after spontaneous Planck scale generation by
hidden chiral symmetry breaking | Revised version accepted by JCAP | JCAP 01 (2022) 01, 005 | 10.1088/1475-7516/2022/01/005 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Dynamical chiral symmetry breaking in a QCD-like hidden sector is used to
generate the Planck mass and the electroweak scale including the heavy
right-handed neutrino mass. A real scalar field transmits the energy scale of
the hidden sector to the visible sectors, playing besides a role of inflaton in
the early Universe while realizing a Higgs-inflation-like model. Our dark
matter candidates are hidden pions that raise due to dynamical chiral symmetry
breaking. They are produced from the decay of inflaton. Unfortunately, it will
be impossible to directly detect them, because they are super heavy
($10^{9\,\sim\,12}$ GeV), and moreover the interaction with the visible sector
is extremely suppressed.
| [
{
"created": "Fri, 10 Sep 2021 11:59:28 GMT",
"version": "v1"
},
{
"created": "Thu, 13 Jan 2022 08:51:45 GMT",
"version": "v2"
}
] | 2022-01-14 | [
[
"Aoki",
"Mayumi",
""
],
[
"Kubo",
"Jisuke",
""
],
[
"Yang",
"Jinbo",
""
]
] | Dynamical chiral symmetry breaking in a QCD-like hidden sector is used to generate the Planck mass and the electroweak scale including the heavy right-handed neutrino mass. A real scalar field transmits the energy scale of the hidden sector to the visible sectors, playing besides a role of inflaton in the early Universe while realizing a Higgs-inflation-like model. Our dark matter candidates are hidden pions that raise due to dynamical chiral symmetry breaking. They are produced from the decay of inflaton. Unfortunately, it will be impossible to directly detect them, because they are super heavy ($10^{9\,\sim\,12}$ GeV), and moreover the interaction with the visible sector is extremely suppressed. |
hep-ph/9403352 | null | R. R. Volkas | Possible reason why leptons are lighter than quarks | (some minor errors corrected, and role of multiple generations
discussed more extensively. Will appear in Phys Rev D.), 8 pages, plain
Latex, UM-P-94/19 | Phys.Rev. D50 (1994) 4625-4629 | 10.1103/PhysRevD.50.4625 | null | hep-ph | null | The minimal model of spontaneously broken leptonic colour and discrete
quark-lepton symmetry predicts that charged leptons have the same masses as
their partner charge $+2/3$ quarks up to small radiative corrections. By
invoking a different pattern of symmetry breaking, a similar model can be
constructed with the structural feature that charged leptons have to be lighter
than their partner quarks because of mixing between leptonic colours, provided
mixing between generations is not too strong. As well as furnishing a new
model-building tool, this is phenomenologically interesting because some of the
new physics responsible for the quark-lepton mass hierarchy could exist on
scales as low as several hundred GeV.
| [
{
"created": "Thu, 24 Mar 1994 06:13:34 GMT",
"version": "v1"
},
{
"created": "Wed, 13 Jul 1994 14:40:34 GMT",
"version": "v2"
}
] | 2009-10-28 | [
[
"Volkas",
"R. R.",
""
]
] | The minimal model of spontaneously broken leptonic colour and discrete quark-lepton symmetry predicts that charged leptons have the same masses as their partner charge $+2/3$ quarks up to small radiative corrections. By invoking a different pattern of symmetry breaking, a similar model can be constructed with the structural feature that charged leptons have to be lighter than their partner quarks because of mixing between leptonic colours, provided mixing between generations is not too strong. As well as furnishing a new model-building tool, this is phenomenologically interesting because some of the new physics responsible for the quark-lepton mass hierarchy could exist on scales as low as several hundred GeV. |
hep-ph/9812379 | Yong Liu | Yong Liu | Does Weak CP Phase Originate from a Certain Geometry ? | 5 pages, Latex file | null | null | null | hep-ph | null | We further investigate the probability that, weak CP phase originates in a
certain geometry. We find that our postulation on weak CP Phase gives strict
constraints on angle gamma in unitarity triangle DB and the element Vtd in
Cabibbo-Kobayashi-Maskawa (CKM) matrix. The predicted Vtd is about 0.0086 and
gamma about 75.3^o with the very narrow window respectively. These two
parameters can be used to test our postulation precisely in near future.
| [
{
"created": "Wed, 16 Dec 1998 08:33:30 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Liu",
"Yong",
""
]
] | We further investigate the probability that, weak CP phase originates in a certain geometry. We find that our postulation on weak CP Phase gives strict constraints on angle gamma in unitarity triangle DB and the element Vtd in Cabibbo-Kobayashi-Maskawa (CKM) matrix. The predicted Vtd is about 0.0086 and gamma about 75.3^o with the very narrow window respectively. These two parameters can be used to test our postulation precisely in near future. |
0704.0076 | Michael Gronau | Michael Gronau | CP violation in beauty decays | 27 pages, minor corrections, to be published in Int. J. Mod. Phys. A | Int.J.Mod.Phys.A22:1953-1982,2007 | 10.1142/S0217751X07036579 | null | hep-ph hep-ex | null | Precision tests of the Kobayashi-Maskawa model of CP violation are discussed,
pointing out possible signatures for other sources of CP violation and for new
flavor-changing operators. The current status of the most accurate tests is
summarized.
| [
{
"created": "Sun, 1 Apr 2007 17:33:15 GMT",
"version": "v1"
},
{
"created": "Mon, 16 Apr 2007 13:15:55 GMT",
"version": "v2"
}
] | 2008-11-26 | [
[
"Gronau",
"Michael",
""
]
] | Precision tests of the Kobayashi-Maskawa model of CP violation are discussed, pointing out possible signatures for other sources of CP violation and for new flavor-changing operators. The current status of the most accurate tests is summarized. |
hep-ph/0008198 | Slabospitsky | M.V. Foursa, D.A. Murashev, and S.R. Slabospitsky, (Institute for High
Energy Physics, Protvino, Russia) | Charged Higgs Contribution into (t b_bar)-pair Production in Hadronic
Collisions | 20 pages, 8 figures; minor corrections in text and references | Phys.Atom.Nucl.67:350-358,2004; Yad.Fiz.67:368-376,2004 | 10.1134/1.1648925 | null | hep-ph | null | We investigate the charged Higgs boson contribution into $t\bar b$-pair
production in pp-collisions at LHC. It is shown that due to the $\cz$-boson
exchange the total yield of $t\bar b$ is modified significantly for small and
large values of $\tan\beta$. However, for the small values of $\tan\beta$ one
should expect also the production of right-polarized top quark contrary to pure
left-polarized t-quark production through $W^{\pm}$-boson exchange only. This
fact provides a possibility to separate $H^{\pm}$ and $W^{\pm}$ contributions
by means of the investigations of angular distributions of top decay products.
The detailed simulation of the signal and relevant background processes is
performed.
| [
{
"created": "Fri, 18 Aug 2000 08:53:23 GMT",
"version": "v1"
},
{
"created": "Tue, 29 Aug 2000 14:41:05 GMT",
"version": "v2"
},
{
"created": "Wed, 4 Oct 2000 05:56:55 GMT",
"version": "v3"
},
{
"created": "Wed, 18 Oct 2000 04:50:17 GMT",
"version": "v4"
}
] | 2011-03-23 | [
[
"Foursa",
"M. V.",
""
],
[
"Murashev",
"D. A.",
""
],
[
"Slabospitsky",
"S. R.",
""
]
] | We investigate the charged Higgs boson contribution into $t\bar b$-pair production in pp-collisions at LHC. It is shown that due to the $\cz$-boson exchange the total yield of $t\bar b$ is modified significantly for small and large values of $\tan\beta$. However, for the small values of $\tan\beta$ one should expect also the production of right-polarized top quark contrary to pure left-polarized t-quark production through $W^{\pm}$-boson exchange only. This fact provides a possibility to separate $H^{\pm}$ and $W^{\pm}$ contributions by means of the investigations of angular distributions of top decay products. The detailed simulation of the signal and relevant background processes is performed. |
hep-ph/0605336 | Qiang Zhao | Qiang Zhao and Frank E. Close | Quarks, diquarks and QCD mixing in the $N^*$ resonance spectrum | Extended version accepted by PRD | Phys.Rev.D74:094014,2006 | 10.1103/PhysRevD.74.094014 | null | hep-ph hep-ex nucl-ex nucl-th | null | We identify a "$\Lambda$ selection rule" for $N^*$ resonances in the presence
of QCD mixing effects. We quantify these mixing effects from existing data and
predict amplitudes for exciting {\bf 20} representations in SU(6), which are
forbidden in strict diquark models. By classifying Particle-Data-Group (PDG)
states at N=2, we show that $\gamma N\to K\Lambda$, $K^*\Lambda$, $K\Sigma$,
$K^*\Sigma$, and $J/\psi \to \bar{p}N^*$ are ideal probes of baryon dynamics
and for establishing whether strongly correlated diquarks survive for $L > 0$.
| [
{
"created": "Wed, 31 May 2006 19:04:31 GMT",
"version": "v1"
},
{
"created": "Thu, 9 Nov 2006 12:34:18 GMT",
"version": "v2"
}
] | 2008-11-26 | [
[
"Zhao",
"Qiang",
""
],
[
"Close",
"Frank E.",
""
]
] | We identify a "$\Lambda$ selection rule" for $N^*$ resonances in the presence of QCD mixing effects. We quantify these mixing effects from existing data and predict amplitudes for exciting {\bf 20} representations in SU(6), which are forbidden in strict diquark models. By classifying Particle-Data-Group (PDG) states at N=2, we show that $\gamma N\to K\Lambda$, $K^*\Lambda$, $K\Sigma$, $K^*\Sigma$, and $J/\psi \to \bar{p}N^*$ are ideal probes of baryon dynamics and for establishing whether strongly correlated diquarks survive for $L > 0$. |
hep-ph/9403273 | null | Thomas D. Cohen, Manoj K. Banerjee, Marina Nielsen and Xuemin Jin | Disoriented Chiral Condensates and Quantum Mechanical Isospin
Correlation | 12 pages in Latex + 1 figure available on request, UMDPP #94-101 | Phys.Lett. B333 (1994) 166-171 | 10.1016/0370-2693(94)91024-3 | null | hep-ph | null | Classical considerations suggest that the probability distribution $P(R)$,
where $R$ is the ratio of neutral pions to total pions emitted from a
disoriented chiral condensate (which has been hypothesized to form in heavy ion
reactions) is $R^{-1/2}/2$. Quantum mechanical isospin correlations between the
condensate and the remainder of the system can alter this. Moments of the P(R)
distribution can be expressed in terms of expectation values of $(I^2/N^2)^m$
where $I$ is the isospin carried by the condensate, $N$ is the number of pions
emitted and m is an arbitrary integer. We find that the probability
distribution is very similar to the classical distribution for $0.1 < R < 0.9$
unless the isospin carried by the condensate is very large.
| [
{
"created": "Fri, 11 Mar 1994 14:54:14 GMT",
"version": "v1"
}
] | 2016-09-01 | [
[
"Cohen",
"Thomas D.",
""
],
[
"Banerjee",
"Manoj K.",
""
],
[
"Nielsen",
"Marina",
""
],
[
"Jin",
"Xuemin",
""
]
] | Classical considerations suggest that the probability distribution $P(R)$, where $R$ is the ratio of neutral pions to total pions emitted from a disoriented chiral condensate (which has been hypothesized to form in heavy ion reactions) is $R^{-1/2}/2$. Quantum mechanical isospin correlations between the condensate and the remainder of the system can alter this. Moments of the P(R) distribution can be expressed in terms of expectation values of $(I^2/N^2)^m$ where $I$ is the isospin carried by the condensate, $N$ is the number of pions emitted and m is an arbitrary integer. We find that the probability distribution is very similar to the classical distribution for $0.1 < R < 0.9$ unless the isospin carried by the condensate is very large. |
1310.2985 | Aleksandra Drozd | Aleksandra Drozd, Bohdan Grzadkowski, Jose Wudka | Cosmology of Multi-Singlet-Scalar Extensions of the Standard Model | 8 pages, 5 figures, presented at the XXXV International Conference of
Theoretical Physics, "Matter to the Deepest", Ustron, Poland, September
12-18, 2011 | Acta Phys.Polon. B42 (2011) 11, 2255 | 10.5506/APhysPolB.42.2255 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | An extension of the Standard Model by extra scalar singlets was considered.
Theoretical (unitarity, vacuum stability, triviality) and cosmological (dark
matter relic abundance, direct detection experiments, constraints on dark
matter self-interaction) constraints were discussed.
| [
{
"created": "Thu, 10 Oct 2013 23:43:06 GMT",
"version": "v1"
}
] | 2013-10-14 | [
[
"Drozd",
"Aleksandra",
""
],
[
"Grzadkowski",
"Bohdan",
""
],
[
"Wudka",
"Jose",
""
]
] | An extension of the Standard Model by extra scalar singlets was considered. Theoretical (unitarity, vacuum stability, triviality) and cosmological (dark matter relic abundance, direct detection experiments, constraints on dark matter self-interaction) constraints were discussed. |
0912.5411 | Rizwan Khalid | Ilia Gogoladze, Rizwan Khalid, Shabbar Raza, Qaisar Shafi | CDMS II Inspired Neutralino Dark Matter in Flipped SU(5) | 4 Pages, 2 Figures, 1 Table | Mod.Phys.Lett.A25:3371-3379,2010 | 10.1142/S0217732310034602 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We investigate neutralino dark matter in supersymmetric flipped SU(5),
focusing on candidates with masses of order 30 - 150 GeV and spin independent
cross sections that are consistent with the most recent CDMS II results. We
assume gravity mediated supersymmetry breaking and restrict the magnitude of
the soft supersymmetry breaking mass parameters to 1 TeV or less. With
non-universal soft gaugino and Higgs masses, and taking flipped SU(5) into
account, we identify allowed regions of the parameter space and highlight some
benchmark solutions including Higgs and sparticle spectroscopy.
| [
{
"created": "Wed, 30 Dec 2009 03:46:33 GMT",
"version": "v1"
}
] | 2011-01-20 | [
[
"Gogoladze",
"Ilia",
""
],
[
"Khalid",
"Rizwan",
""
],
[
"Raza",
"Shabbar",
""
],
[
"Shafi",
"Qaisar",
""
]
] | We investigate neutralino dark matter in supersymmetric flipped SU(5), focusing on candidates with masses of order 30 - 150 GeV and spin independent cross sections that are consistent with the most recent CDMS II results. We assume gravity mediated supersymmetry breaking and restrict the magnitude of the soft supersymmetry breaking mass parameters to 1 TeV or less. With non-universal soft gaugino and Higgs masses, and taking flipped SU(5) into account, we identify allowed regions of the parameter space and highlight some benchmark solutions including Higgs and sparticle spectroscopy. |
0906.4277 | Mrinal Dasgupta | Andrea Banfi, Mrinal Dasgupta and Rosa Maria Duran Delgado | The Z boson a_T distribution at hadron colliders | Submitted to the proceedings of DIS 2009 | null | null | MAN/HEP/2009/23 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We provide a theoretical study of a novel variable introduced in
Ref. \cite{WV} to study the transverse momentum of the Z boson at hadron
colliders. The variable we consider has experimental advantages over the
standard $p_T$ distribution enabling more accurate measurement at low $p_T$. We
provide an all orders perturbative estimate for this variable at the
next-to--leading logarithmic accuracy and compare the results to those for the
standard $p_T$ distribution. We test our resummation, at the two-loop level, by
comparing its expansion to fixed-order perturbative estimates and find
agreement with our expectations.
| [
{
"created": "Tue, 23 Jun 2009 14:45:59 GMT",
"version": "v1"
}
] | 2009-06-24 | [
[
"Banfi",
"Andrea",
""
],
[
"Dasgupta",
"Mrinal",
""
],
[
"Delgado",
"Rosa Maria Duran",
""
]
] | We provide a theoretical study of a novel variable introduced in Ref. \cite{WV} to study the transverse momentum of the Z boson at hadron colliders. The variable we consider has experimental advantages over the standard $p_T$ distribution enabling more accurate measurement at low $p_T$. We provide an all orders perturbative estimate for this variable at the next-to--leading logarithmic accuracy and compare the results to those for the standard $p_T$ distribution. We test our resummation, at the two-loop level, by comparing its expansion to fixed-order perturbative estimates and find agreement with our expectations. |
hep-ph/0004002 | Nuclear Physics | S. Arunagiri (U. Madras) | Spectators effect in inclusive beauty decays | 3 pages, Revetex | null | null | UOM/NPh/HQP/00-2 | hep-ph | null | I review the role of the spectator quarks effect in the inclusive beauty
decays. The evaluation of the expectation values of four-quark operators
between hadronic states and its consequences are discussed.
| [
{
"created": "Sat, 1 Apr 2000 05:16:54 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Arunagiri",
"S.",
"",
"U. Madras"
]
] | I review the role of the spectator quarks effect in the inclusive beauty decays. The evaluation of the expectation values of four-quark operators between hadronic states and its consequences are discussed. |
hep-ph/0608330 | Shufang Su | Hock-Seng Goh and Shufang Su | Phenomenology of Left-Right Twin Higgs Model | 6 pages, 4 figures, to appear in Proceedings of SUSY06, the 14th
International Conference on Supersymmetry and the Unification of Fundamental
Interactions, UC Irvine, California, 12-17 June 2006 | AIPConf.Proc.903:431-434,2007 | 10.1063/1.2735216 | null | hep-ph | null | Twin Higgs mechanism has recently been proposed to solve the ``little
Hierarchy'' problem. We studied the implementation of twin Higgs mechanism in
left-right models. We discussed the particle spectrum, and the collider
phenomenology at the Large Hadron Collider.
| [
{
"created": "Wed, 30 Aug 2006 20:24:29 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Goh",
"Hock-Seng",
""
],
[
"Su",
"Shufang",
""
]
] | Twin Higgs mechanism has recently been proposed to solve the ``little Hierarchy'' problem. We studied the implementation of twin Higgs mechanism in left-right models. We discussed the particle spectrum, and the collider phenomenology at the Large Hadron Collider. |
1801.03560 | Scott A. Yost | S.A. Yost, S. Jadach, B.F.L. Ward, Z. Was | KKMC-hh: A Precision Event Generator for EW Radiative Corrections in
Hadron Scattering | 10 pages, 18 figures. Presented by S.A. Yost at RADCOR 2017, the 13th
International Symposium on Radiative Corrections, 24-29 September, 2017 in
St. Gilgen, Austria | PoS (RADCOR2017) (2018) 023 | null | BU-HEPP-18-01 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | KKMC-hh is a precision event-generator for Z production and decay in hadronic
collisions, which applies amplitude-level exponentiation to both initial and
final state photon radiation, including perturbative residuals through order
$\alpha^2 L$, together with electroweak matrix element corrections. We present
results showing the effect of multi-photon radiation for cuts motivated by a
recent ATLAS W-mass analysis. We also show preliminary untuned comparisons of
the electroweak corrections of KKMC-hh to those of HORACE, which includes order
$\alpha$ corrections with exponentiated final-state photon radiation.
| [
{
"created": "Wed, 10 Jan 2018 21:29:52 GMT",
"version": "v1"
}
] | 2018-02-06 | [
[
"Yost",
"S. A.",
""
],
[
"Jadach",
"S.",
""
],
[
"Ward",
"B. F. L.",
""
],
[
"Was",
"Z.",
""
]
] | KKMC-hh is a precision event-generator for Z production and decay in hadronic collisions, which applies amplitude-level exponentiation to both initial and final state photon radiation, including perturbative residuals through order $\alpha^2 L$, together with electroweak matrix element corrections. We present results showing the effect of multi-photon radiation for cuts motivated by a recent ATLAS W-mass analysis. We also show preliminary untuned comparisons of the electroweak corrections of KKMC-hh to those of HORACE, which includes order $\alpha$ corrections with exponentiated final-state photon radiation. |
hep-ph/0302114 | Dumitru Ion | D. B. Ion (CERN and NIPNE-HH), E. K. Sarkisyan (CERN and Univ. of
Manchester) | Dual coherent particle emission as generalized two-component
Cherenkov-like effect | 12 pages, 4 figs | null | null | null | hep-ph | null | In this Letter we introduce a new kind of coherent particle production
mechanism called dual coherent particle emission (DCPE) as generalized
two-component Cherenkov-like effect, which takes place when the phase velocity
of emitted particle v_{Mph} and the particle source phase velocity v_{B_1ph}
satisfy a specific DCPE condition: v_{Mph} <= v_{B_1ph}^{-1}. The general
signatures of the DCPE in dielectric, nuclear and hadronic media are
established and some experimental evidences are presented.
| [
{
"created": "Fri, 14 Feb 2003 14:34:08 GMT",
"version": "v1"
},
{
"created": "Wed, 15 Oct 2003 17:09:55 GMT",
"version": "v2"
}
] | 2007-05-23 | [
[
"Ion",
"D. B.",
"",
"CERN and NIPNE-HH"
],
[
"Sarkisyan",
"E. K.",
"",
"CERN and Univ. of\n Manchester"
]
] | In this Letter we introduce a new kind of coherent particle production mechanism called dual coherent particle emission (DCPE) as generalized two-component Cherenkov-like effect, which takes place when the phase velocity of emitted particle v_{Mph} and the particle source phase velocity v_{B_1ph} satisfy a specific DCPE condition: v_{Mph} <= v_{B_1ph}^{-1}. The general signatures of the DCPE in dielectric, nuclear and hadronic media are established and some experimental evidences are presented. |
1211.5841 | Andrii Salii | Laszlo Jenkovszky, Oleg Kuprash, Risto Orava, and Andrii Salii | Low missing mass, single- and double diffraction dissociation at the LHC | null | null | null | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Low missing mass, single- and double diffraction dissociation is calculated
for the LHC energies from a dual-Regge model, dominated by a Pomeron Regge pole
exchange. The model reproduces the rich resonance structure in the low missing
mass Mx region. The diffractionly excited states lie on the nucleon trajectory,
appended by the isolated Roper resonance. Detailed predictions for the squared
momentum transfer and missing mass dependence of the differential and
integrated single- and double diffraction dissociation in the kinematical range
of present and future LHC measurements are given. The model predicts a possible
turn-down of the cross section towards, t -> 0 in a region probably accessible
in future experiments in the nearly forward direction.
The present work is a continuation and extension (e.g. with double
diffraction) of a previous work using the dual Regge approach.
| [
{
"created": "Mon, 26 Nov 2012 02:12:45 GMT",
"version": "v1"
}
] | 2012-11-27 | [
[
"Jenkovszky",
"Laszlo",
""
],
[
"Kuprash",
"Oleg",
""
],
[
"Orava",
"Risto",
""
],
[
"Salii",
"Andrii",
""
]
] | Low missing mass, single- and double diffraction dissociation is calculated for the LHC energies from a dual-Regge model, dominated by a Pomeron Regge pole exchange. The model reproduces the rich resonance structure in the low missing mass Mx region. The diffractionly excited states lie on the nucleon trajectory, appended by the isolated Roper resonance. Detailed predictions for the squared momentum transfer and missing mass dependence of the differential and integrated single- and double diffraction dissociation in the kinematical range of present and future LHC measurements are given. The model predicts a possible turn-down of the cross section towards, t -> 0 in a region probably accessible in future experiments in the nearly forward direction. The present work is a continuation and extension (e.g. with double diffraction) of a previous work using the dual Regge approach. |
hep-ph/0206307 | Zurab Tavartkiladze | Filipe Paccetti Correia, Michael G. Schmidt, Zurab Tavartkiladze | 5D SUSY Orbifold SU(6) GUT and Pseudo-Goldstone Higgs Doublets | References added, to appear in Phys. Lett. B | Phys.Lett.B545:153-161,2002 | 10.1016/S0370-2693(02)02585-6 | null | hep-ph | null | We construct a 5D SUSY SU(6) GUT on an $S^{(1)}/Z_2\tm Z_2'$ orbifold. The
first stage of gauge symmetry breaking occurs through compactification and a
specific selection of boundary conditions. Additional symmetries play a crucial
role for the generation of $\mu $ and $B\mu $ terms of appropriate values: with
a $SU(2)_{cus}$ custodial symmetry the Higgs doublets naturally emerge as
massless pseudo-Goldstone bosons in the unbroken SUSY limit. After SUSY
breaking they get masses of the order of the weak scale. If instead of
$SU(2)_{cus}$ a discrete $Z_5$ symmetry is applied the Higgs doublet's masses
are still adequately suppressed, but they are not pseudo-Goldstones. The $Z_5$
discrete symmetry also can be very important for GUT scale generation and an
all order hierarchy. Fermion masses are naturally generated and nicely blend
with additional symmetries. In the considered scenario unification of the three
gauge couplings occurs near $10^{16}$ GeV.
| [
{
"created": "Fri, 28 Jun 2002 15:22:35 GMT",
"version": "v1"
},
{
"created": "Mon, 9 Sep 2002 12:58:52 GMT",
"version": "v2"
}
] | 2008-11-26 | [
[
"Correia",
"Filipe Paccetti",
""
],
[
"Schmidt",
"Michael G.",
""
],
[
"Tavartkiladze",
"Zurab",
""
]
] | We construct a 5D SUSY SU(6) GUT on an $S^{(1)}/Z_2\tm Z_2'$ orbifold. The first stage of gauge symmetry breaking occurs through compactification and a specific selection of boundary conditions. Additional symmetries play a crucial role for the generation of $\mu $ and $B\mu $ terms of appropriate values: with a $SU(2)_{cus}$ custodial symmetry the Higgs doublets naturally emerge as massless pseudo-Goldstone bosons in the unbroken SUSY limit. After SUSY breaking they get masses of the order of the weak scale. If instead of $SU(2)_{cus}$ a discrete $Z_5$ symmetry is applied the Higgs doublet's masses are still adequately suppressed, but they are not pseudo-Goldstones. The $Z_5$ discrete symmetry also can be very important for GUT scale generation and an all order hierarchy. Fermion masses are naturally generated and nicely blend with additional symmetries. In the considered scenario unification of the three gauge couplings occurs near $10^{16}$ GeV. |
hep-ph/9909386 | Jose Kenichi Mizukoshi | A. Belyaev, M. Drees, J. K. Mizukoshi | Supersymmetric Higgs Boson Pair Production: Discovery Prospects at
Hadron Colliders | 27 pages, 7 figures, REVTeX, corrected typos in the Eq. (6). Version
to be published in Eur. Phys. J. C | Eur.Phys.J.C17:337-351,2000 | 10.1007/s100520000436 | null | hep-ph | null | We study the potential of hadron colliders in the search for the pair
production of neutral Higgs bosons in the framework of the Minimal
Supersymmetric Standard Model. We perform a detailed signal and background
analysis, working out efficient kinematical cuts for the extraction of the
signal. The important role of squark loop contributions to the signal is
re--emphasized. If the signal is sufficiently enhanced by these contributions,
it could even be observable at the next run of the upgraded Tevatron collider
in the near future. At the LHC the pair production of light and heavy Higgs
bosons might be detectable simultaneously.
| [
{
"created": "Wed, 15 Sep 1999 16:33:23 GMT",
"version": "v1"
},
{
"created": "Sat, 13 Nov 1999 00:41:20 GMT",
"version": "v2"
},
{
"created": "Tue, 18 Apr 2000 19:41:21 GMT",
"version": "v3"
}
] | 2009-01-07 | [
[
"Belyaev",
"A.",
""
],
[
"Drees",
"M.",
""
],
[
"Mizukoshi",
"J. K.",
""
]
] | We study the potential of hadron colliders in the search for the pair production of neutral Higgs bosons in the framework of the Minimal Supersymmetric Standard Model. We perform a detailed signal and background analysis, working out efficient kinematical cuts for the extraction of the signal. The important role of squark loop contributions to the signal is re--emphasized. If the signal is sufficiently enhanced by these contributions, it could even be observable at the next run of the upgraded Tevatron collider in the near future. At the LHC the pair production of light and heavy Higgs bosons might be detectable simultaneously. |
1606.03808 | Yin Jiang | Yin Jiang and Jinfeng Liao | Pairing Phase Transitions of Matter under Rotation | 6 pages, 4 figures | Phys. Rev. Lett. 117, 192302 (2016) | 10.1103/PhysRevLett.117.192302 | null | hep-ph cond-mat.quant-gas hep-th nucl-th quant-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The phases and properties of matter under global rotation have attracted much
interest recently. In this paper we investigate the pairing phenomena in a
system of fermions under the presence of rotation. We find that there is a
generic suppression effect on pairing states with zero angular momentum. We
demonstrate this effect with the chiral condensation and the color
superconductivity in hot dense QCD matter as explicit examples. In the case of
chiral condensation, a new phase diagram in the temperature-rotation parameter
space is found, with a nontrivial critical point.
| [
{
"created": "Mon, 13 Jun 2016 04:36:33 GMT",
"version": "v1"
}
] | 2016-11-09 | [
[
"Jiang",
"Yin",
""
],
[
"Liao",
"Jinfeng",
""
]
] | The phases and properties of matter under global rotation have attracted much interest recently. In this paper we investigate the pairing phenomena in a system of fermions under the presence of rotation. We find that there is a generic suppression effect on pairing states with zero angular momentum. We demonstrate this effect with the chiral condensation and the color superconductivity in hot dense QCD matter as explicit examples. In the case of chiral condensation, a new phase diagram in the temperature-rotation parameter space is found, with a nontrivial critical point. |
2110.04311 | Ricardo Cepedello | Alexandre Alvarez, Ricardo Cepedello, Martin Hirsch, Werner Porod | Temperature effects on the $Z_2$ symmetry breaking in the scotogenic
model | 11 pages, 3 figures | Phys.Rev.D 105 (2022) 3, 035013 | 10.1103/PhysRevD.105.035013 | IFIC/21-35 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | It is well-known that the scotogenic model for neutrino mass generation can
explain correctly the relic abundance of cold dark matter. There have been
claims in the literature that an important part of the parameter space of the
simplest scotogentic model can be constrained by the requirement that no
$Z_2$-breaking must occur in the early universe. Here we show that this
requirement does not give any constraints on the underlying parameter space at
least in those parts, where we can trust perturbation theory. To demonstrate
this, we have taken into account the proper decoupling of heavy degrees of
freedom in both, the thermal potential and in the RGE evolution.
| [
{
"created": "Fri, 8 Oct 2021 18:00:03 GMT",
"version": "v1"
}
] | 2022-08-10 | [
[
"Alvarez",
"Alexandre",
""
],
[
"Cepedello",
"Ricardo",
""
],
[
"Hirsch",
"Martin",
""
],
[
"Porod",
"Werner",
""
]
] | It is well-known that the scotogenic model for neutrino mass generation can explain correctly the relic abundance of cold dark matter. There have been claims in the literature that an important part of the parameter space of the simplest scotogentic model can be constrained by the requirement that no $Z_2$-breaking must occur in the early universe. Here we show that this requirement does not give any constraints on the underlying parameter space at least in those parts, where we can trust perturbation theory. To demonstrate this, we have taken into account the proper decoupling of heavy degrees of freedom in both, the thermal potential and in the RGE evolution. |
hep-ph/0505217 | Leticia Cunqueiro | L. Cunqueiro, J. Dias de Deus, and C. Pajares | Associated multiplicity to high $p_T$ events and percolation of colour
sources | 9 pages, 1 figure | null | null | null | hep-ph | null | We show that the multiplicity distribution associated to high $p_T$ events is
given in terms of the total multiplicity distribution in an universal way due
to the fact that these events are self-shadowed. In particular, the mean
associated multiplicity is related to the fluctuations on the multiplicity
distribution. In the framework of percolation of strings these fluctuations are
related to clustering and as a result the associated multiplicity presents a
peculiar dependence on centrality which can be experimentally tested.
| [
{
"created": "Wed, 25 May 2005 12:27:11 GMT",
"version": "v1"
},
{
"created": "Tue, 26 Jul 2005 16:17:04 GMT",
"version": "v2"
}
] | 2007-05-23 | [
[
"Cunqueiro",
"L.",
""
],
[
"de Deus",
"J. Dias",
""
],
[
"Pajares",
"C.",
""
]
] | We show that the multiplicity distribution associated to high $p_T$ events is given in terms of the total multiplicity distribution in an universal way due to the fact that these events are self-shadowed. In particular, the mean associated multiplicity is related to the fluctuations on the multiplicity distribution. In the framework of percolation of strings these fluctuations are related to clustering and as a result the associated multiplicity presents a peculiar dependence on centrality which can be experimentally tested. |
1907.12824 | Alexandre Kisselev | S.C. Inan and A.V. Kisselev | Muon pair production via photon-induced scattering at the CLIC in models
with extra dimensions | 37 pages, 19 figures. Several formulas with comments are added.
Figures 13 and 14 are corrected, figure 19 is added | null | 10.1016/j.nuclphysb.2020.115047 | null | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The photon-induced dimuon production $e^+ e^- \to e^+ \gamma \gamma e^- \to
e^+ \mu^+ \mu^- e^-$ at the CLIC is studied in the framework of three models
with extra dimensions. The electron beam energies 750 GeV and 1500 GeV are
considered. The total cross sections are calculated depending on the minimal
transverse momenta of the final muons. The sensitivity bounds on the parameters
of the models are obtained as functions of the CLIC integrated luminosity.
| [
{
"created": "Tue, 30 Jul 2019 10:24:15 GMT",
"version": "v1"
},
{
"created": "Mon, 7 Oct 2019 09:05:16 GMT",
"version": "v2"
},
{
"created": "Thu, 12 Dec 2019 09:14:57 GMT",
"version": "v3"
},
{
"created": "Mon, 29 Jun 2020 17:02:54 GMT",
"version": "v4"
}
] | 2020-06-30 | [
[
"Inan",
"S. C.",
""
],
[
"Kisselev",
"A. V.",
""
]
] | The photon-induced dimuon production $e^+ e^- \to e^+ \gamma \gamma e^- \to e^+ \mu^+ \mu^- e^-$ at the CLIC is studied in the framework of three models with extra dimensions. The electron beam energies 750 GeV and 1500 GeV are considered. The total cross sections are calculated depending on the minimal transverse momenta of the final muons. The sensitivity bounds on the parameters of the models are obtained as functions of the CLIC integrated luminosity. |
1010.5204 | Lu-Hsing Tsai | Xiao-Gang He, and Lu-Hsing Tsai | Spontaneous CP Violating Phase as the Phase in PMNS Matrix | 16 pages, 3 figures | Eur.Phys.J.C71:1598,2011 | 10.1140/epjc/s10052-011-1598-1 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the possibility of identifying the CP violating phases in the PMNS
mixing matrix in the lepton sector and also that in the CKM mixing matrix in
the quark sector with the phase responsible for the spontaneous CP violation in
the Higgs potential, and some implications. Since the phase in the CKM mixing
matrix is determined by experimental data, the phase in the lepton sector is
therefore also fixed. The mass matrix for neutrinos is constrained leading to
constraints on the Jarlskog CP violating parameter $J$, and the effective mass
$<m_{\beta\beta}>$ for neutrinoless double beta decay. The Yukawa couplings are
also constrained. Different ways of identifying the phases have different
predictions for $\mu \to e e\bar e$ and $\tau \to l_1 l_2 \bar l_3$. Future
experimental data can be used to distinguish different models.
| [
{
"created": "Mon, 25 Oct 2010 17:42:16 GMT",
"version": "v1"
}
] | 2011-03-21 | [
[
"He",
"Xiao-Gang",
""
],
[
"Tsai",
"Lu-Hsing",
""
]
] | We study the possibility of identifying the CP violating phases in the PMNS mixing matrix in the lepton sector and also that in the CKM mixing matrix in the quark sector with the phase responsible for the spontaneous CP violation in the Higgs potential, and some implications. Since the phase in the CKM mixing matrix is determined by experimental data, the phase in the lepton sector is therefore also fixed. The mass matrix for neutrinos is constrained leading to constraints on the Jarlskog CP violating parameter $J$, and the effective mass $<m_{\beta\beta}>$ for neutrinoless double beta decay. The Yukawa couplings are also constrained. Different ways of identifying the phases have different predictions for $\mu \to e e\bar e$ and $\tau \to l_1 l_2 \bar l_3$. Future experimental data can be used to distinguish different models. |
2107.13917 | Mar\'ia Moreno Ll\'acer | V\'ictor Miralles, Marcos Miralles L\'opez, Mar\'ia Moreno Ll\'acer,
Ana Pe\~nuelas, Mart\'in Perell\'o, Marcel Vos | The top quark electro-weak couplings after LHC Run 2 | null | JHEP02(2022)032 | 10.1007/JHEP02(2022)032 | IFIC/21-28 | hep-ph hep-ex | http://creativecommons.org/licenses/by/4.0/ | Recent measurements at the Large Hadron Collider allow for a robust and
precise characterisation of the electro-weak interactions of the top quark. We
present the results of a global analysis at next-to-leading order precision
including LHC, LEP/SLD and Tevatron data in the framework of the Standard Model
Effective Field Theory. We include a careful analysis of the impact of
correlations among measurements, as well as of the uncertainties in the
Effective Field Theory setup itself. We find remarkably robust global fit
results, with central values in good agreement with the Standard Model
prediction, and 95% probability bounds on Wilson coefficients that range from
$\pm$ 0.35 to $\pm$ 8 TeV$^{-2}$. This result represents a considerable
improvement over previous studies, thanks to the addition of differential
cross-section measurements in associated production processes of top quarks and
neutral gauge bosons.
| [
{
"created": "Thu, 29 Jul 2021 11:48:55 GMT",
"version": "v1"
},
{
"created": "Thu, 5 Aug 2021 16:54:52 GMT",
"version": "v2"
},
{
"created": "Thu, 10 Feb 2022 20:40:04 GMT",
"version": "v3"
}
] | 2022-02-14 | [
[
"Miralles",
"Víctor",
""
],
[
"López",
"Marcos Miralles",
""
],
[
"Llácer",
"María Moreno",
""
],
[
"Peñuelas",
"Ana",
""
],
[
"Perelló",
"Martín",
""
],
[
"Vos",
"Marcel",
""
]
] | Recent measurements at the Large Hadron Collider allow for a robust and precise characterisation of the electro-weak interactions of the top quark. We present the results of a global analysis at next-to-leading order precision including LHC, LEP/SLD and Tevatron data in the framework of the Standard Model Effective Field Theory. We include a careful analysis of the impact of correlations among measurements, as well as of the uncertainties in the Effective Field Theory setup itself. We find remarkably robust global fit results, with central values in good agreement with the Standard Model prediction, and 95% probability bounds on Wilson coefficients that range from $\pm$ 0.35 to $\pm$ 8 TeV$^{-2}$. This result represents a considerable improvement over previous studies, thanks to the addition of differential cross-section measurements in associated production processes of top quarks and neutral gauge bosons. |
hep-ph/0511024 | Youngman Kim | Youngman Kim, Kuniharu Kubodera, Dong-Pil Min, Fred Myhrer and Mannque
Rho | The effect of Kaon Condensation on Quark-Antiquark Condensate in Dense
Matter | 17 pages, 3 figures, two subsections are removed. To appear in Nucl.
Phys. A | Nucl.Phys.A792:249-263,2007 | 10.1016/j.nuclphysa.2007.05.005 | null | hep-ph nucl-th | null | Assuming that at sufficiently high densities the constituent quarks become
relevant degrees of freedom, we study within the framework of a chiral quark
model the influence of s-wave $K^-$ condensation on the quark-antiquark
condensates. We find that, in linear density approximation, the presence of a
$K^-$ condensate quenches the $\bar{u}u$ condensate, but that the $\bar{d}d$
condensate remains unaffected up to the chiral order under consideration. We
discuss the implication of the suppressed $\bar{u}u$ condensate for
flavor-dependent chiral symmetry restoration in dense matter
| [
{
"created": "Thu, 3 Nov 2005 06:46:22 GMT",
"version": "v1"
},
{
"created": "Wed, 20 Jun 2007 07:25:37 GMT",
"version": "v2"
}
] | 2008-11-26 | [
[
"Kim",
"Youngman",
""
],
[
"Kubodera",
"Kuniharu",
""
],
[
"Min",
"Dong-Pil",
""
],
[
"Myhrer",
"Fred",
""
],
[
"Rho",
"Mannque",
""
]
] | Assuming that at sufficiently high densities the constituent quarks become relevant degrees of freedom, we study within the framework of a chiral quark model the influence of s-wave $K^-$ condensation on the quark-antiquark condensates. We find that, in linear density approximation, the presence of a $K^-$ condensate quenches the $\bar{u}u$ condensate, but that the $\bar{d}d$ condensate remains unaffected up to the chiral order under consideration. We discuss the implication of the suppressed $\bar{u}u$ condensate for flavor-dependent chiral symmetry restoration in dense matter |
2303.14487 | Roman Ryutin Dr | R.A. Ryutin | Central exclusive diffractive $p$ $\bar{p}$ production in the
Regge-eikonal model in the "scalar'' proton approximation | 11 pages, 8 figures. arXiv admin note: substantial text overlap with
arXiv:2112.13274, arXiv:1910.06683 | null | 10.1140/epjc/s10052-023-11777-4 | null | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Central exclusive diffractive production (CEDP) of proton anti-proton pairs
was calculated in the Regge-eikonal approach taking into account continuum and
possible $f_0(2100)$ resonance. We use the simple model with the ``scalar''
proton. Data from ISR and STAR were analysed and compared with theoretical
description. Some predictions for the LHC at 13~TeV are also presented. We
discuss shortly possible nuances, problems and prospects of investigations of
this process at present and future hadron colliders.
| [
{
"created": "Sat, 25 Mar 2023 14:39:32 GMT",
"version": "v1"
}
] | 2023-08-09 | [
[
"Ryutin",
"R. A.",
""
]
] | Central exclusive diffractive production (CEDP) of proton anti-proton pairs was calculated in the Regge-eikonal approach taking into account continuum and possible $f_0(2100)$ resonance. We use the simple model with the ``scalar'' proton. Data from ISR and STAR were analysed and compared with theoretical description. Some predictions for the LHC at 13~TeV are also presented. We discuss shortly possible nuances, problems and prospects of investigations of this process at present and future hadron colliders. |
hep-ph/9211302 | null | Matthias Neubert | Two-loop corrections to the Isgur-Wise function in QCD sum rules | 24 pages (REVTEX), 2 figures available upon request, SLAC-PUB-5992 | Phys.Rev. D47 (1993) 4063-4076 | 10.1103/PhysRevD.47.4063 | null | hep-ph | null | We complete the QCD sum rule analysis of the Isgur Wise form factor
$\xi(v\cdot v')$ at next-to-leading order in renormalization-group improved
perturbation theory. To this end, the exact result for the two-loop corrections
to the perturbative contribution is derived using the heavy quark effective
theory. Several techniques for the evaluation of two-loop integrals involving
two different types of heavy quark propagators are discussed in detail, among
them the methods of integration by parts and differential equations. The
order-$\alpha_s$ corrections to the Isgur-Wise function turn out to be small
and well under control. At large recoil, they tend to decrease the form factor
by $5-10\%$.
| [
{
"created": "Tue, 24 Nov 1992 18:15:00 GMT",
"version": "v1"
}
] | 2009-10-22 | [
[
"Neubert",
"Matthias",
""
]
] | We complete the QCD sum rule analysis of the Isgur Wise form factor $\xi(v\cdot v')$ at next-to-leading order in renormalization-group improved perturbation theory. To this end, the exact result for the two-loop corrections to the perturbative contribution is derived using the heavy quark effective theory. Several techniques for the evaluation of two-loop integrals involving two different types of heavy quark propagators are discussed in detail, among them the methods of integration by parts and differential equations. The order-$\alpha_s$ corrections to the Isgur-Wise function turn out to be small and well under control. At large recoil, they tend to decrease the form factor by $5-10\%$. |
1712.02239 | Ying Li | Zhi-Tian Zou, Ying Li, Xin Liu | Study of $B_c \to DS$ Decays in PQCD Approach | 29 pages. arXiv admin note: text overlap with arXiv:0811.2648 by
other authors | Phys. Rev. D 97, 053005 (2018) | 10.1103/PhysRevD.97.053005 | null | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Within the framework of perturbative QCD approach based on $k_T$
factorization, we studied 40 $B_c \to DS$ decay modes in the leading order and
leading power, where "S" stands for the light scalar meson. Under two different
scenarios (S1 and S2) for the description of scalar mesons, we explored the
branching fractions and related CP asymmetries. As a heavy meson consisting of
two heavy quarks with different flavor, the light-cone distribution amplitude
of $B_c$ meson has not been well defined, so the $\delta$-function is adopted.
The contributions of emission diagrams are suppressed by the vector decay
constants and CKM elements, the contributions of annihilation are dominant.
After the calculation, we found some branching fractions are in the range of
$[10^{-5}, 10^{-4}]$, which could be measured in the current LHCb experiment,
and other decays with smaller branching fractions will be tested at the
high-energy colliders in future. Furthermore, some decay modes have large CP
asymmetries, but they are unmeasurable currently due to the small branching
fractions.
| [
{
"created": "Tue, 5 Dec 2017 12:48:54 GMT",
"version": "v1"
},
{
"created": "Fri, 8 Dec 2017 08:55:28 GMT",
"version": "v2"
}
] | 2018-03-28 | [
[
"Zou",
"Zhi-Tian",
""
],
[
"Li",
"Ying",
""
],
[
"Liu",
"Xin",
""
]
] | Within the framework of perturbative QCD approach based on $k_T$ factorization, we studied 40 $B_c \to DS$ decay modes in the leading order and leading power, where "S" stands for the light scalar meson. Under two different scenarios (S1 and S2) for the description of scalar mesons, we explored the branching fractions and related CP asymmetries. As a heavy meson consisting of two heavy quarks with different flavor, the light-cone distribution amplitude of $B_c$ meson has not been well defined, so the $\delta$-function is adopted. The contributions of emission diagrams are suppressed by the vector decay constants and CKM elements, the contributions of annihilation are dominant. After the calculation, we found some branching fractions are in the range of $[10^{-5}, 10^{-4}]$, which could be measured in the current LHCb experiment, and other decays with smaller branching fractions will be tested at the high-energy colliders in future. Furthermore, some decay modes have large CP asymmetries, but they are unmeasurable currently due to the small branching fractions. |
hep-ph/9807451 | Jonathan R. Ellis | John Ellis and N.E. Mavromatos | High-Energy QCD as a Topological Field Theory | 24 pages LATEX, one eps figure incorporated | Eur.Phys.J.C8:91-102,1999 | 10.1007/s100529901047 | OUTP-98-51P | hep-ph hep-th | null | We propose an identification of the conformal field theory underlying
Lipatov's spin-chain model of high-energy scattering in perturbative QCD. It is
a twisted N=2 supersymmetric topological field theory, which arises as the
limiting case of the SL(2,R)/U(1) non-linear sigma model that also plays a role
in describing the Quantum Hall effect and black holes in string theory. The
doubly-infinite set of non-trivial integrals of motion of the high-energy
spin-chain model displayed by Faddeev and Korchemsky are identified as the
Cartan subalgebra of a W_{\infty} \otimes W_{\infty} bosonic sub-symmetry
possessed by this topological theory. The renormalization group and an analysis
of instanton perturbations yield some understanding why this particular
topological spin-chain model emerges in the high-energy limit, and provide a
new estimate of the asymptotic behaviour of multi-Reggeized-gluon exchange.
| [
{
"created": "Tue, 21 Jul 1998 17:12:48 GMT",
"version": "v1"
}
] | 2009-09-11 | [
[
"Ellis",
"John",
""
],
[
"Mavromatos",
"N. E.",
""
]
] | We propose an identification of the conformal field theory underlying Lipatov's spin-chain model of high-energy scattering in perturbative QCD. It is a twisted N=2 supersymmetric topological field theory, which arises as the limiting case of the SL(2,R)/U(1) non-linear sigma model that also plays a role in describing the Quantum Hall effect and black holes in string theory. The doubly-infinite set of non-trivial integrals of motion of the high-energy spin-chain model displayed by Faddeev and Korchemsky are identified as the Cartan subalgebra of a W_{\infty} \otimes W_{\infty} bosonic sub-symmetry possessed by this topological theory. The renormalization group and an analysis of instanton perturbations yield some understanding why this particular topological spin-chain model emerges in the high-energy limit, and provide a new estimate of the asymptotic behaviour of multi-Reggeized-gluon exchange. |
1905.05523 | Zbigniew Was | E. Richter-Was and Z. Was | LHC Higgs CP Sensitive Observables in H to tau^+ tau^-; tau^pm to
(3pi)^pm nu and Machine Learning Benefits | 6 pages, 3 figures, Presented at Rencontres de Moriond, QCD and High
Energy Interactions session, March 2019 | null | null | IFJPAN-IV-2019-6 | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In phenomenological preparation for new measurements one searches for the
carriers of quality signatures. Often, the first approach quantities may be
difficult to measure or to provide sufficiently precise predictions for
comparisons.
Complexity of necessary details grow with precision. To achieve the goal one
can not break the theory principles, and take into account effects which could
be ignored earlier. Mixed approach where dominant effects are taken into
account with intuitive even simplistic approach was developed.
Non dominant corrections were controlled with the help of Monte Carlo
simulations.
Concept of Optimal Variables was successfully applied for many measurements.
New techniques, like Machine Learning, offer solutions to exploit
multidimensional signatures. Complementarity of these new and old approaches is
studied for the example of Higgs Boson CP-parity measurements in H to
tau^+tau^-, tau^pm \to nu (3pi)^pm cascade decays.
| [
{
"created": "Tue, 14 May 2019 11:17:42 GMT",
"version": "v1"
}
] | 2019-05-15 | [
[
"Richter-Was",
"E.",
""
],
[
"Was",
"Z.",
""
]
] | In phenomenological preparation for new measurements one searches for the carriers of quality signatures. Often, the first approach quantities may be difficult to measure or to provide sufficiently precise predictions for comparisons. Complexity of necessary details grow with precision. To achieve the goal one can not break the theory principles, and take into account effects which could be ignored earlier. Mixed approach where dominant effects are taken into account with intuitive even simplistic approach was developed. Non dominant corrections were controlled with the help of Monte Carlo simulations. Concept of Optimal Variables was successfully applied for many measurements. New techniques, like Machine Learning, offer solutions to exploit multidimensional signatures. Complementarity of these new and old approaches is studied for the example of Higgs Boson CP-parity measurements in H to tau^+tau^-, tau^pm \to nu (3pi)^pm cascade decays. |
0903.1158 | Defu Hou | Defu Hou and Hai-cang Ren | On Melting Temperature of Heavy Quarkonium with the AdS/CFT Implied
Potential | 6 pages with 3 tables in Latex, contribution to the proceedings of
Strange quark matter 2008, Beijing, Oct. 5, 2008 | J.Phys.G36:064052,2009 | 10.1088/0954-3899/36/6/064052 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The quarkonium states in a quark-gluon plasma is examined with the potential
implied by AdS/CFT duality. Both the vanila AdS-Schwarzschild metric and the
one with an infrared cutoff are considered. The calculated dissociation
temperatures for $J/\psi$ and $\Upsilon$ are found to agree with the lattice
results within a factor of two.
| [
{
"created": "Fri, 6 Mar 2009 06:40:54 GMT",
"version": "v1"
}
] | 2010-01-15 | [
[
"Hou",
"Defu",
""
],
[
"Ren",
"Hai-cang",
""
]
] | The quarkonium states in a quark-gluon plasma is examined with the potential implied by AdS/CFT duality. Both the vanila AdS-Schwarzschild metric and the one with an infrared cutoff are considered. The calculated dissociation temperatures for $J/\psi$ and $\Upsilon$ are found to agree with the lattice results within a factor of two. |
hep-ph/9907344 | Thomas G. Rizzo | Thomas G. Rizzo | Distinguishing Indirect Signatures Arising From New Physics at the NLC | 5 pages, 4 figs, LaTex; talk given at The World-Wide Study of Physics
and Detectors for Future Linear Colliders(LCWS99), Sitges, Barcelona, Spain,
28 April-5 May 1999 | null | null | SLAC-PUB-8194 | hep-ph | null | Many sources of new physics can lead to shifts in the Standard Model
predictions for cross sections and asymmetries at the NLC below their direct
production thresholds. In this talk we discuss some of the tools that are
useful for distinguishing amongst these new physics scenarios. R-parity
violation and extensions of the Standard Model gauge structure are two typical
non-minimal realizations of supersymmetry which provide us with an important
test case to examine.
| [
{
"created": "Tue, 13 Jul 1999 20:44:24 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Rizzo",
"Thomas G.",
""
]
] | Many sources of new physics can lead to shifts in the Standard Model predictions for cross sections and asymmetries at the NLC below their direct production thresholds. In this talk we discuss some of the tools that are useful for distinguishing amongst these new physics scenarios. R-parity violation and extensions of the Standard Model gauge structure are two typical non-minimal realizations of supersymmetry which provide us with an important test case to examine. |
1112.5430 | Isabella Masina | Isabella Masina, Alessio Notari | Standard Model False Vacuum Inflation: Correlating the Tensor-to-Scalar
Ratio to the Top Quark and Higgs Boson masses | v1: 4 pages, 2 figures; v2: 5 pages, 2 figures, improvements in the
text; v3: 5 pages, 2 figures, minor improvements in the text, matches PRL
version | null | 10.1103/PhysRevLett.108.191302 | null | hep-ph astro-ph.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | For a narrow band of values of the top quark and Higgs boson masses, the
Standard Model Higgs potential develops a false minimum at energies of about
$10^{16}$ GeV, where primordial Inflation could have started in a cold
metastable state. A graceful exit to a radiation-dominated era is provided,
e.g., by scalar-tensor gravity models. We pointed out that if Inflation
happened in this false minimum, the Higgs boson mass has to be in the range
$126.0 \pm 3.5$ GeV, where ATLAS and CMS subsequently reported excesses of
events. Here we show that for these values of the Higgs boson mass, the
inflationary gravitational wave background has be discovered with a
tensor-to-scalar ratio at hand of future experiments. We suggest that combining
cosmological observations with measurements of the top quark and Higgs boson
masses represents a further test of the hypothesis that the Standard Model
false minimum was the source of Inflation in the Universe.
| [
{
"created": "Thu, 22 Dec 2011 19:52:36 GMT",
"version": "v1"
},
{
"created": "Thu, 26 Apr 2012 10:13:43 GMT",
"version": "v2"
},
{
"created": "Thu, 3 May 2012 10:54:29 GMT",
"version": "v3"
}
] | 2013-05-30 | [
[
"Masina",
"Isabella",
""
],
[
"Notari",
"Alessio",
""
]
] | For a narrow band of values of the top quark and Higgs boson masses, the Standard Model Higgs potential develops a false minimum at energies of about $10^{16}$ GeV, where primordial Inflation could have started in a cold metastable state. A graceful exit to a radiation-dominated era is provided, e.g., by scalar-tensor gravity models. We pointed out that if Inflation happened in this false minimum, the Higgs boson mass has to be in the range $126.0 \pm 3.5$ GeV, where ATLAS and CMS subsequently reported excesses of events. Here we show that for these values of the Higgs boson mass, the inflationary gravitational wave background has be discovered with a tensor-to-scalar ratio at hand of future experiments. We suggest that combining cosmological observations with measurements of the top quark and Higgs boson masses represents a further test of the hypothesis that the Standard Model false minimum was the source of Inflation in the Universe. |
1909.02519 | Gino Isidori | Javier Fuentes-Mart\'in, Gino Isidori, Julie Pag\`es, Kei Yamamoto | With or without U(2)? Probing non-standard flavor and helicity
structures in semileptonic B decays | 12 pages, 4 figures (v2: very minor modifications) | Phys.Lett. B800 (2020) 135080 | 10.1016/j.physletb.2019.135080 | ZU-TH-42/19 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Motivated by the recent hints of lepton flavor universality violation
observed in semileptonic $B$ decays, we analyze how to test flavor and helicity
structures of the corresponding amplitudes in view of future data. We show that
the general assumption that such non-standard effects are controlled by a
$U(2)_q \times U(2)_\ell$ flavor symmetry, minimally broken as in the Standard
Model Yukawa sector, leads to stringent predictions on leptonic and
semileptonic $B$ decays. Future measurements of $R_{D^{(*)}}$, $R_{K^{(*)}}$,
${\mathcal B}(\bar B_{c,u}\to \ell \bar \nu)$, ${\mathcal B}(\bar B \to \pi
\ell \bar\nu)$, ${\mathcal B}(B \to \pi \ell \bar\ell)$, ${\mathcal
B}(B_{s,d}\to\ell\bar\ell^{(\prime)})$, as well as various polarization
asymmetries in $\bar B\to D^{(*)} \tau \bar \nu$ decays, will allow to prove or
falsify this general hypothesis independently of its dynamical origin.
| [
{
"created": "Thu, 5 Sep 2019 16:42:37 GMT",
"version": "v1"
},
{
"created": "Mon, 28 Oct 2019 15:55:13 GMT",
"version": "v2"
}
] | 2019-11-21 | [
[
"Fuentes-Martín",
"Javier",
""
],
[
"Isidori",
"Gino",
""
],
[
"Pagès",
"Julie",
""
],
[
"Yamamoto",
"Kei",
""
]
] | Motivated by the recent hints of lepton flavor universality violation observed in semileptonic $B$ decays, we analyze how to test flavor and helicity structures of the corresponding amplitudes in view of future data. We show that the general assumption that such non-standard effects are controlled by a $U(2)_q \times U(2)_\ell$ flavor symmetry, minimally broken as in the Standard Model Yukawa sector, leads to stringent predictions on leptonic and semileptonic $B$ decays. Future measurements of $R_{D^{(*)}}$, $R_{K^{(*)}}$, ${\mathcal B}(\bar B_{c,u}\to \ell \bar \nu)$, ${\mathcal B}(\bar B \to \pi \ell \bar\nu)$, ${\mathcal B}(B \to \pi \ell \bar\ell)$, ${\mathcal B}(B_{s,d}\to\ell\bar\ell^{(\prime)})$, as well as various polarization asymmetries in $\bar B\to D^{(*)} \tau \bar \nu$ decays, will allow to prove or falsify this general hypothesis independently of its dynamical origin. |
1603.06417 | Qi-Fang L\"u | Qi-Fang L\"u and Yu-Bing Dong | Masses of open charm and bottom tetraquark states in a relativized quark
model | 5 pages, 1 figure, 2 tables. Version accepted by Phys. Rev. D | Phys. Rev. D 94, 094041 (2016) | 10.1103/PhysRevD.94.094041 | null | hep-ph hep-ex nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the masses of open charm and bottom tetraquark states within the
diquark-antidiquark scenario in the relativized quark model proposed by Godfrey
and Isgur. The diquark and antidiquark masses are firstly solved by relativized
quark potential, and then treated as the usual antiquark and quark,
respectively. The masses of tetraquark states are obtained by solving the
Schr\"{o}dinger-type equation between the new diquark and antidiquark. We find
the masses of $sq\bar b\bar q$ tetraquark configuration are much higher than
that of $X(5568)$. This conclusion disfavors the possibility of $X(5568)$ as a
tetraquark state within the diquark-antidiquark scenario. Further experimental
searches are needed to clarify the nature of the signal observed by D0
collaboration.
| [
{
"created": "Mon, 21 Mar 2016 13:06:46 GMT",
"version": "v1"
},
{
"created": "Fri, 25 Mar 2016 13:38:15 GMT",
"version": "v2"
},
{
"created": "Wed, 19 Oct 2016 09:37:04 GMT",
"version": "v3"
},
{
"created": "Wed, 9 Nov 2016 16:28:10 GMT",
"version": "v4"
}
] | 2016-12-07 | [
[
"Lü",
"Qi-Fang",
""
],
[
"Dong",
"Yu-Bing",
""
]
] | We study the masses of open charm and bottom tetraquark states within the diquark-antidiquark scenario in the relativized quark model proposed by Godfrey and Isgur. The diquark and antidiquark masses are firstly solved by relativized quark potential, and then treated as the usual antiquark and quark, respectively. The masses of tetraquark states are obtained by solving the Schr\"{o}dinger-type equation between the new diquark and antidiquark. We find the masses of $sq\bar b\bar q$ tetraquark configuration are much higher than that of $X(5568)$. This conclusion disfavors the possibility of $X(5568)$ as a tetraquark state within the diquark-antidiquark scenario. Further experimental searches are needed to clarify the nature of the signal observed by D0 collaboration. |
hep-ph/9411322 | Ivanov D. Y. | A.P.Burichenko, D.Yu.Ivanov | Vacuum polarization correction to the positronium decay rate | 10 pages, LaTeX | null | null | BINP 93-64 | hep-ph | null | Corrections $\sim \alpha^2 $ to the positronium decay rate, induced by
one--loop vacuum polarization diagram, are calculated. Their relative values
are $0.4468(3)(\alpha/\pi)^2$ for para- and $0.960(3)(\alpha/\pi)^2$ for
orthopositronium.
| [
{
"created": "Thu, 17 Nov 1994 13:49:39 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Burichenko",
"A. P.",
""
],
[
"Ivanov",
"D. Yu.",
""
]
] | Corrections $\sim \alpha^2 $ to the positronium decay rate, induced by one--loop vacuum polarization diagram, are calculated. Their relative values are $0.4468(3)(\alpha/\pi)^2$ for para- and $0.960(3)(\alpha/\pi)^2$ for orthopositronium. |
1606.00097 | Wei Wang | Xiao-Gang He, Wei Wang, Rui-Lin Zhu | Production of Charmed Tetraquarks from $B_c$ and $B$ decays | 14 pages | J. Phys. G: Nucl. Part. Phys. 44 014003 (2016) | 10.1088/0954-3899/44/1/014003 | null | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Hadronic states composed of multi-quark flavors may exist in reality since
they are not prohibited by QCD. Compact four quark systems of color singlet are
classified as tetraquarks. To understand the properties of these states, more
theoretical and experimental efforts are needed. In this work, we study charmed
tetraquarks with three light flavors using flavor $SU(3)$ symmetry. States with
three different light quarks must be in a ${\bf \bar 6 }$ or a ${\bf 15}$
multiplet. We investigate the production of charmed tetraquarks $X_c$ in $B\to
X_c (\overline {X}_c) P$ and $B_c \to X_c P$ decays. Whether the states with
three light quarks belong to ${\bf \bar 6}$ or ${\bf 15}$ can be determined by
studying various tetraquark $B$ and $B_c$ decays. We demonstrate that the decay
amplitudes for these decays can be parametrized by a few irreducible SU(3)
invariant amplitudes. We then derive relations for decay widths and CP
violating rate difference which can be examined experimentally. Although no
experimental measurement is available yet, they might be accessed at the
ongoing and forthcoming experiments like the LHCb and Belle-II. Measurements of
these observables can not only provide useful information for the study of
exotics spectroscopy but are also valuable information towards a better
understanding of some non-perturbative aspects of QCD.
| [
{
"created": "Wed, 1 Jun 2016 02:35:19 GMT",
"version": "v1"
}
] | 2016-12-16 | [
[
"He",
"Xiao-Gang",
""
],
[
"Wang",
"Wei",
""
],
[
"Zhu",
"Rui-Lin",
""
]
] | Hadronic states composed of multi-quark flavors may exist in reality since they are not prohibited by QCD. Compact four quark systems of color singlet are classified as tetraquarks. To understand the properties of these states, more theoretical and experimental efforts are needed. In this work, we study charmed tetraquarks with three light flavors using flavor $SU(3)$ symmetry. States with three different light quarks must be in a ${\bf \bar 6 }$ or a ${\bf 15}$ multiplet. We investigate the production of charmed tetraquarks $X_c$ in $B\to X_c (\overline {X}_c) P$ and $B_c \to X_c P$ decays. Whether the states with three light quarks belong to ${\bf \bar 6}$ or ${\bf 15}$ can be determined by studying various tetraquark $B$ and $B_c$ decays. We demonstrate that the decay amplitudes for these decays can be parametrized by a few irreducible SU(3) invariant amplitudes. We then derive relations for decay widths and CP violating rate difference which can be examined experimentally. Although no experimental measurement is available yet, they might be accessed at the ongoing and forthcoming experiments like the LHCb and Belle-II. Measurements of these observables can not only provide useful information for the study of exotics spectroscopy but are also valuable information towards a better understanding of some non-perturbative aspects of QCD. |
2201.02788 | Kazem Azizi | S. S. Agaev, K. Azizi, H. Sundu | Hadronic molecule model for the doubly charmed state $T^{+}_{cc}$ | 13 Pages and 4 Figures | null | 10.1007/JHEP06(2022)057 | null | hep-ph hep-ex hep-lat | http://creativecommons.org/licenses/by/4.0/ | The mass, current coupling, and width of the doubly charmed four-quark meson
$T_{cc}^{+}$ are explored by treating it as a hadronic molecule $
M_{cc}^{+}\equiv D^{0}D^{\ast +}$. The mass and current coupling of this
molecule are calculated using the QCD two-point sum rule method by including
into analysis contributions of various vacuum condensates up to dimension $ 10
$. The prediction for the mass $m=(4060\pm 130)~\mathrm{MeV}$ exceeds the
two-meson $D^{0}D^{\ast +}$ threshold $3875.1~\mathrm{MeV}$, which makes decay
of the molecule $M_{cc}^{+}$ to a pair of conventional mesons $ D^{0}D^{\ast
+}$ kinematically allowed process. The strong coupling $G $ of particles at the
vertex $M_{cc}^{+}D^{0}D^{\ast +}$ is found by applying the QCD three-point sum
rule approach, and used to evaluate the width of the decay $M_{cc}^{+} \to
D^{0}D^{\ast +}$. Obtained result for the width $ \Gamma=(3.8\pm
1.7)~\mathrm{MeV}$ demonstrates that $M_{cc}^{+}$ is wider than the resonance
$T_{cc}^{+}$.
| [
{
"created": "Sat, 8 Jan 2022 08:23:02 GMT",
"version": "v1"
},
{
"created": "Mon, 14 Mar 2022 18:29:21 GMT",
"version": "v2"
},
{
"created": "Fri, 10 Jun 2022 17:10:29 GMT",
"version": "v3"
}
] | 2022-06-29 | [
[
"Agaev",
"S. S.",
""
],
[
"Azizi",
"K.",
""
],
[
"Sundu",
"H.",
""
]
] | The mass, current coupling, and width of the doubly charmed four-quark meson $T_{cc}^{+}$ are explored by treating it as a hadronic molecule $ M_{cc}^{+}\equiv D^{0}D^{\ast +}$. The mass and current coupling of this molecule are calculated using the QCD two-point sum rule method by including into analysis contributions of various vacuum condensates up to dimension $ 10 $. The prediction for the mass $m=(4060\pm 130)~\mathrm{MeV}$ exceeds the two-meson $D^{0}D^{\ast +}$ threshold $3875.1~\mathrm{MeV}$, which makes decay of the molecule $M_{cc}^{+}$ to a pair of conventional mesons $ D^{0}D^{\ast +}$ kinematically allowed process. The strong coupling $G $ of particles at the vertex $M_{cc}^{+}D^{0}D^{\ast +}$ is found by applying the QCD three-point sum rule approach, and used to evaluate the width of the decay $M_{cc}^{+} \to D^{0}D^{\ast +}$. Obtained result for the width $ \Gamma=(3.8\pm 1.7)~\mathrm{MeV}$ demonstrates that $M_{cc}^{+}$ is wider than the resonance $T_{cc}^{+}$. |
hep-ph/9804256 | Marek Pawlowski | Marek Pawlowski | Gauge theory of phase and scale | 11 pages, latex, no figures; invited talk given at the international
workshop "Macroscopic Electrodynamics II", Krakow, November 97; proceedings
to be published in Turkish J. of Physics | Turk.J.Phys.23:895-902,1999 | null | null | hep-ph astro-ph gr-qc hep-th | null | The old Weyl's idea of scale recalibration freedom and the Infeld and van der
Waerden (IW) ideas concerning geometrical interpretation of the natural spinor
phase gauge symmetry are discussed in the context of moderm models of
fundamental particle interactions. It is argued that IW gauge symmetry can be
naturaly identified with U(1) symmetry of Weinberg-Salam model. It is also
argued that there are no serious reasons to reject Weyl's gauge theory from the
considerations. Its inclusion enriches the original Weinberg-Salam theory and
leads to predictions of new phenomena that do not contradict experiments.
| [
{
"created": "Wed, 8 Apr 1998 10:14:22 GMT",
"version": "v1"
}
] | 2011-04-20 | [
[
"Pawlowski",
"Marek",
""
]
] | The old Weyl's idea of scale recalibration freedom and the Infeld and van der Waerden (IW) ideas concerning geometrical interpretation of the natural spinor phase gauge symmetry are discussed in the context of moderm models of fundamental particle interactions. It is argued that IW gauge symmetry can be naturaly identified with U(1) symmetry of Weinberg-Salam model. It is also argued that there are no serious reasons to reject Weyl's gauge theory from the considerations. Its inclusion enriches the original Weinberg-Salam theory and leads to predictions of new phenomena that do not contradict experiments. |
hep-ph/9810528 | Nikolai Romanenko | J.Maalampi (1) and N.Romanenko (1 and 2) ((1) Theory Division,
Department of Physics, University of Helsinki, Finland; (2) Petersburg
Nuclear Physics Institute, Gatchina, Russia) | Production of qqQQ final states in ee collisions in the left-right
symmetric model | 24 pages, 9 eps figures, uses axodraw.sty | Phys.Rev. D60 (1999) 055002 | 10.1103/PhysRevD.60.055002 | HIP-1998-71/TH | hep-ph | null | We consider the reaction ee ->qqQQ as a test of lepton number
non-conservation in the framework of the left-right-symmetric electroweak
model. The main contributions to this process are due to Majorana neutrino
exchange in t-channel and doubly charged Higgs (Delta{--}) exchange in
s-channel with a pair of right-handed weak bosons (WR) as intermediate state.
We show that in a linear ee collider with the collision energy of 1 TeV (1.5
TeV) the cross section of this process is 0.01 fb (1 fb), and it will, for the
anticipated luminosity of 10**{35} cm**{-2}, be detectable below the WR
threshold. We study the sensitivity of the reaction on the masses of the heavy
neutrino, WR and Delta{--}.
| [
{
"created": "Thu, 29 Oct 1998 16:24:08 GMT",
"version": "v1"
}
] | 2009-10-31 | [
[
"Maalampi",
"J.",
"",
"1 and 2"
],
[
"Romanenko",
"N.",
"",
"1 and 2"
]
] | We consider the reaction ee ->qqQQ as a test of lepton number non-conservation in the framework of the left-right-symmetric electroweak model. The main contributions to this process are due to Majorana neutrino exchange in t-channel and doubly charged Higgs (Delta{--}) exchange in s-channel with a pair of right-handed weak bosons (WR) as intermediate state. We show that in a linear ee collider with the collision energy of 1 TeV (1.5 TeV) the cross section of this process is 0.01 fb (1 fb), and it will, for the anticipated luminosity of 10**{35} cm**{-2}, be detectable below the WR threshold. We study the sensitivity of the reaction on the masses of the heavy neutrino, WR and Delta{--}. |
2309.08358 | Andreas Krassnigg | S. Kaidisch, T. U. Hilger, A. Krassnigg, W. Lucha | Pole-fitting for complex functions: enhancing standard techniques by
artificial-neural-network classifiers and regressors | 20 pages, 10 figures, 7 tables | Computer Physics Communications, Volume 295, 2024, 108998 | 10.1016/j.cpc.2023.108998 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Motivated by a use case in theoretical hadron physics, we revisit an
application of a pole-sum fit to dressing functions of a confined quark
propagator. More precisely, we investigate approaches to determine the number
and positions of the singularities closest to the origin for a function that is
only known numerically on a specific finite grid of values on the positive real
axis. For this problem, we compare the efficiency of standard techniques, like
the Levenberg-Marquardt algorithm, to a pure artificial-neural-network approach
as well as a combination of these two. This combination is more efficient than
any of the two techniques separately. Such an approach is generalizable to
similar situations, where the positions of poles of a function in a complex
variable must be quickly and reliably estimated from real-axis information
alone.
| [
{
"created": "Fri, 15 Sep 2023 12:34:16 GMT",
"version": "v1"
}
] | 2023-11-09 | [
[
"Kaidisch",
"S.",
""
],
[
"Hilger",
"T. U.",
""
],
[
"Krassnigg",
"A.",
""
],
[
"Lucha",
"W.",
""
]
] | Motivated by a use case in theoretical hadron physics, we revisit an application of a pole-sum fit to dressing functions of a confined quark propagator. More precisely, we investigate approaches to determine the number and positions of the singularities closest to the origin for a function that is only known numerically on a specific finite grid of values on the positive real axis. For this problem, we compare the efficiency of standard techniques, like the Levenberg-Marquardt algorithm, to a pure artificial-neural-network approach as well as a combination of these two. This combination is more efficient than any of the two techniques separately. Such an approach is generalizable to similar situations, where the positions of poles of a function in a complex variable must be quickly and reliably estimated from real-axis information alone. |
2109.02139 | A. Tureanu | Tomi Kupiainen and Anca Tureanu | Seesaw, coherence and neutrino oscillations | 27 pages; clarifications and references added | null | 10.1140/epjc/s10052-021-09819-w | null | hep-ph hep-th | http://creativecommons.org/licenses/by/4.0/ | We present a prescription for consistently constructing non-Fock coherent
flavour neutrino states within the framework of the seesaw mechanism, and
establish that the physical vacuum of massive neutrinos is a condensate of
Standard Model massless neutrino states. The coherent states, involving a
finite number of massive states, are derived by constructing their creation
operator. Such a construction is the key requirement so that the oscillations
of particles indeed occur. We comment on the inherent non-unitarity of the
oscillation probability induced by the requirement of coherence.
| [
{
"created": "Sun, 5 Sep 2021 18:26:15 GMT",
"version": "v1"
},
{
"created": "Fri, 24 Sep 2021 17:36:53 GMT",
"version": "v2"
}
] | 2022-01-05 | [
[
"Kupiainen",
"Tomi",
""
],
[
"Tureanu",
"Anca",
""
]
] | We present a prescription for consistently constructing non-Fock coherent flavour neutrino states within the framework of the seesaw mechanism, and establish that the physical vacuum of massive neutrinos is a condensate of Standard Model massless neutrino states. The coherent states, involving a finite number of massive states, are derived by constructing their creation operator. Such a construction is the key requirement so that the oscillations of particles indeed occur. We comment on the inherent non-unitarity of the oscillation probability induced by the requirement of coherence. |
hep-ph/0702089 | Steve Blanchet | Steve Blanchet and Pasquale Di Bari | Flavor effects in thermal leptogenesis | 3 pages, no figure ; contribution to the proceedings of NOW 2006,
Conca Specchiulla, Sep. 9-16, 2006 | Nucl.Phys.Proc.Suppl.168:372-374,2007 | 10.1016/j.nuclphysbps.2007.02.041 | null | hep-ph | null | We review recent developments in leptogenesis on flavor effects. Their
account discloses an important connection between the matter-antimatter
asymmetry of the Universe and CP violation at low energies. Besides, they
modify the upper bound on the neutrino masses holding in the unflavored case.
In this respect, it is important to identify the exact condition for flavor
effects to be relevant and for the `fully flavored' Boltzmann equations to be
valid.
| [
{
"created": "Thu, 8 Feb 2007 13:21:59 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Blanchet",
"Steve",
""
],
[
"Di Bari",
"Pasquale",
""
]
] | We review recent developments in leptogenesis on flavor effects. Their account discloses an important connection between the matter-antimatter asymmetry of the Universe and CP violation at low energies. Besides, they modify the upper bound on the neutrino masses holding in the unflavored case. In this respect, it is important to identify the exact condition for flavor effects to be relevant and for the `fully flavored' Boltzmann equations to be valid. |
hep-ph/9801258 | Stephane Keller | E. J. Eichten and S. Keller | Compositeness Test at the FMC with Bhabha Scattering | talk given by S. Keller at the Workshop on Physics at the First Muon
Collider and the Front End of a Muon Collider, Fermilab, November 6--9, 1997,
to appear in the Proceedings | null | 10.1063/1.56221 | FERMILAB-Conf-98/011-T | hep-ph | null | It is possible that quarks and/or leptons have substructure that will become
manifest at high energies. Here we investigate the limits on the muon
compositeness scale that could be obtained at the First Muon Collider using
Bhabha scattering. We study this limit as a function of the collider energy and
the angular cut imposed by the detector capability.
| [
{
"created": "Fri, 9 Jan 1998 21:41:15 GMT",
"version": "v1"
}
] | 2009-10-31 | [
[
"Eichten",
"E. J.",
""
],
[
"Keller",
"S.",
""
]
] | It is possible that quarks and/or leptons have substructure that will become manifest at high energies. Here we investigate the limits on the muon compositeness scale that could be obtained at the First Muon Collider using Bhabha scattering. We study this limit as a function of the collider energy and the angular cut imposed by the detector capability. |
1811.00979 | Ipsita Saha | Dipankar Das, Ipsita Saha | Cornering variants of Georgi-Machacek model using Higgs precision data | 9 pages, 4 captioned figures. Accepted for publication in Phys. Rev.
D | Phys. Rev. D 98, 095010 (2018) | 10.1103/PhysRevD.98.095010 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We show that in the absence of trilinear terms in the scalar potential of
Georgi-Machacek model, heavy charged scalars do not necessarily decouple from
the $h \to \gamma \gamma$ decay amplitude. In such scenarios, measurement of
the Higgs to diphoton signal strength can place stringent constraints in the
parameter space. Using the projected precisions at the High Luminosity LHC
(HL-LHC) and the ILC, we find that the upper bound on the triplet vacuum
expectation value can be as low as 10 GeV. We also found that when combined
with the theoretical constraints from perturbative unitarity and stability,
such variants may be ruled out altogether.
| [
{
"created": "Fri, 2 Nov 2018 16:49:44 GMT",
"version": "v1"
}
] | 2018-11-21 | [
[
"Das",
"Dipankar",
""
],
[
"Saha",
"Ipsita",
""
]
] | We show that in the absence of trilinear terms in the scalar potential of Georgi-Machacek model, heavy charged scalars do not necessarily decouple from the $h \to \gamma \gamma$ decay amplitude. In such scenarios, measurement of the Higgs to diphoton signal strength can place stringent constraints in the parameter space. Using the projected precisions at the High Luminosity LHC (HL-LHC) and the ILC, we find that the upper bound on the triplet vacuum expectation value can be as low as 10 GeV. We also found that when combined with the theoretical constraints from perturbative unitarity and stability, such variants may be ruled out altogether. |
2211.07661 | Mark Hertzberg | Itamar J. Allali, Mark P. Hertzberg, Yi Lyu | Reduced Axion Abundance from an Extended Symmetry | 13 pages, 6 figures, in double column format. V2: Updated towards
version published in Phys. Rev. D | Phys. Rev. D 107, 043535 (2023) | 10.1103/PhysRevD.107.043535 | null | hep-ph astro-ph.CO hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In recent work we showed that the relic dark matter abundance of QCD axions
can be altered when the Peccei-Quinn (PQ) field is coupled to very light
scalar/s, rendering the effective axion mass dynamical in the early universe.
In this work we develop this framework further, by introducing a new extended
symmetry group to protect the new particles' mass. We find that with a new
global $SO(N)$ symmetry, with large $N$, we can not only account for the
lightness of the new scalars, but we can reduce the axion relic abundance in a
technically natural way. This opens up the possibility of large PQ scales,
including approaching the GUT scale, and still naturally producing the correct
relic abundance of axions. Also, in these models the effective PQ scale is
relatively small in the very early universe, and so this can help towards
alleviating the isocurvature problem from inflation. Furthermore, instead of
possible over-closure from cosmic strings, the extended symmetry implies the
formation of non-topological textures which provide a relatively small
abundance.
| [
{
"created": "Mon, 14 Nov 2022 19:00:01 GMT",
"version": "v1"
},
{
"created": "Fri, 24 Feb 2023 19:37:36 GMT",
"version": "v2"
}
] | 2023-02-28 | [
[
"Allali",
"Itamar J.",
""
],
[
"Hertzberg",
"Mark P.",
""
],
[
"Lyu",
"Yi",
""
]
] | In recent work we showed that the relic dark matter abundance of QCD axions can be altered when the Peccei-Quinn (PQ) field is coupled to very light scalar/s, rendering the effective axion mass dynamical in the early universe. In this work we develop this framework further, by introducing a new extended symmetry group to protect the new particles' mass. We find that with a new global $SO(N)$ symmetry, with large $N$, we can not only account for the lightness of the new scalars, but we can reduce the axion relic abundance in a technically natural way. This opens up the possibility of large PQ scales, including approaching the GUT scale, and still naturally producing the correct relic abundance of axions. Also, in these models the effective PQ scale is relatively small in the very early universe, and so this can help towards alleviating the isocurvature problem from inflation. Furthermore, instead of possible over-closure from cosmic strings, the extended symmetry implies the formation of non-topological textures which provide a relatively small abundance. |
1810.09143 | Pengxuan Zhu | Junjie Cao, Yangle He, Liangliang Shang, Yang Zhang, Pengxuan Zhu | Current Status of Natural NMSSM in Light of LHC 13TeV Data and XENON-1T
Results | 21 figures, 30 pages | Phys. Rev. D 99, 075020 (2019) | 10.1103/PhysRevD.99.075020 | CoEPP-MN-18-8 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In the natural realization of the Next-to-minimal Supersymmetric Standard
Model, Higgsinos tend to be lighter than about several hundred GeVs, which can
induce detectable leptonic signals at the LHC as well as large DM-nucleon
scattering cross section. We explore the constraints from the direct searches
for electroweakino and slepton at the LHC Run II and the latest DM direct
detection experiments on the scenario with low fine tuning indicator
$\Delta_{Z/h} \leq 50$. We find that these experiments are complementary to
each other in excluding the scenario, and as far as each kind of experiment is
concerned, it is strong enough to exclude a large portion of the parameter
space. As a result, the scenario with Bino- or Higgsino-dominated DM is
disfavored, and that with Singlino-dominated DM is tightly limited. There are
two regions in natural NMSSM parameter space surviving in the current
experimental limits. One is featured with a decoupled Singlino-dominated LSP
with $\mu \simeq m_{\widetilde{\chi}_1^0}$, which cannot be explored by neither
DM detections or collider searches. The other parameter space region is
featured by $10^{-47}~{\rm cm^2} \lesssim \sigma^{SI}_{\widetilde{\chi}-p}
\lesssim 10^{-46}~{\rm cm^2}$ and the correlation $\mu \simeq
m_{\widetilde{\chi}_1^0}$, which will be explored by near future DM detection
experiments.
| [
{
"created": "Mon, 22 Oct 2018 08:57:43 GMT",
"version": "v1"
},
{
"created": "Fri, 29 Mar 2019 06:35:46 GMT",
"version": "v2"
}
] | 2019-04-24 | [
[
"Cao",
"Junjie",
""
],
[
"He",
"Yangle",
""
],
[
"Shang",
"Liangliang",
""
],
[
"Zhang",
"Yang",
""
],
[
"Zhu",
"Pengxuan",
""
]
] | In the natural realization of the Next-to-minimal Supersymmetric Standard Model, Higgsinos tend to be lighter than about several hundred GeVs, which can induce detectable leptonic signals at the LHC as well as large DM-nucleon scattering cross section. We explore the constraints from the direct searches for electroweakino and slepton at the LHC Run II and the latest DM direct detection experiments on the scenario with low fine tuning indicator $\Delta_{Z/h} \leq 50$. We find that these experiments are complementary to each other in excluding the scenario, and as far as each kind of experiment is concerned, it is strong enough to exclude a large portion of the parameter space. As a result, the scenario with Bino- or Higgsino-dominated DM is disfavored, and that with Singlino-dominated DM is tightly limited. There are two regions in natural NMSSM parameter space surviving in the current experimental limits. One is featured with a decoupled Singlino-dominated LSP with $\mu \simeq m_{\widetilde{\chi}_1^0}$, which cannot be explored by neither DM detections or collider searches. The other parameter space region is featured by $10^{-47}~{\rm cm^2} \lesssim \sigma^{SI}_{\widetilde{\chi}-p} \lesssim 10^{-46}~{\rm cm^2}$ and the correlation $\mu \simeq m_{\widetilde{\chi}_1^0}$, which will be explored by near future DM detection experiments. |
2203.16132 | Maria B. Barbaro | Maria B. Barbaro | Towards (semi) exclusive cross section measurements and modelling | 9 pages, 3 figures, Proceedings of the 22nd International Workshop on
Neutrinos from Accelerators (NuFact2021), September 5-11, 2021, (Online/In
person) Cagliari, Italy | null | null | null | hep-ph nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Semi-inclusive neutrino-nucleus scattering, corresponding to the simultaneous
detection of a lepton and one or more hadrons in the final state, is shown to
be much more sensitive to nuclear effects than the inclusive process. The
theoretical description of the semi-inclusive process is illustrated and some
comparisons of relativistic plane wave impulse approximation (RPWIA)
predictions with recent MicroBooNE, T2K and MINERvA data on argon and carbon
are shown. The merit of new variables constructed to enhance particular nuclear
effects is also illustrated and future developments going beyond the RPWIA
approach are outlined.
| [
{
"created": "Wed, 30 Mar 2022 08:20:36 GMT",
"version": "v1"
}
] | 2022-03-31 | [
[
"Barbaro",
"Maria B.",
""
]
] | Semi-inclusive neutrino-nucleus scattering, corresponding to the simultaneous detection of a lepton and one or more hadrons in the final state, is shown to be much more sensitive to nuclear effects than the inclusive process. The theoretical description of the semi-inclusive process is illustrated and some comparisons of relativistic plane wave impulse approximation (RPWIA) predictions with recent MicroBooNE, T2K and MINERvA data on argon and carbon are shown. The merit of new variables constructed to enhance particular nuclear effects is also illustrated and future developments going beyond the RPWIA approach are outlined. |
1512.06739 | Pasquale Di Bari | Pasquale Di Bari and Michele Re Fiorentin | Supersymmetric $SO(10)$-inspired leptogenesis and a new $N_2$-dominated
scenario | 35 pages, 10 figures; v3: matches JCAP version | null | 10.1088/1475-7516/2016/03/039 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the supersymmetric extension of $SO(10)$-inspired thermal
leptogenesis showing the constraints on neutrino parameters and on the reheat
temperature $T_{\rm RH}$ that derive from the condition of successful
leptogenesis from next-to-lightest right handed (RH) neutrinos ($N_2$) decays
and the more stringent ones when independence of the initial conditions (strong
thermal leptogenesis) is superimposed. In the latter case, the increase of the
lightest right-handed neutrino ($N_1$) decay parameters helps the wash-out of a
pre-existing asymmetry and constraints relax compared to the non-supersymmetric
case. We find significant changes especially in the case of large $\tan\beta$
values $(\gtrsim 15)$. In particular, for normal ordering, the atmospheric
mixing angle can now be also maximal. The lightest (ordinary) neutrino mass is
still constrained within the range $10 \lesssim m_1/{\rm meV} \lesssim 30$
(corresponding to $75\lesssim \sum_i m_i/{\rm meV} \lesssim 120$). Inverted
ordering is still disfavoured, but an allowed region satisfying strong thermal
leptogenesis opens up at large $\tan\beta$ values. We also study in detail the
lower bound on $T_{\rm RH}$ finding $T_{\rm RH}\gtrsim 1 \times 10^{10}\,{\rm
GeV}$ independently of the initial $N_2$ abundance. Finally, we propose a new
$N_2$-dominated scenario where the $N_1$ mass is lower than the sphaleron
freeze-out temperature. In this case there is no $N_1$ wash-out and we find
$T_{\rm RH} \gtrsim 1\times 10^{9}\,{\rm GeV}$. These results indicate that
$SO(10)$-inspired thermal leptogenesis can be made compatible with the upper
bound from the gravitino problem, an important result in light of the role
often played by supersymmetry in the quest of a realistic model of fermion
masses.
| [
{
"created": "Mon, 21 Dec 2015 18:15:22 GMT",
"version": "v1"
},
{
"created": "Thu, 7 Jan 2016 21:30:03 GMT",
"version": "v2"
},
{
"created": "Mon, 15 Feb 2016 19:59:29 GMT",
"version": "v3"
}
] | 2016-04-06 | [
[
"Di Bari",
"Pasquale",
""
],
[
"Fiorentin",
"Michele Re",
""
]
] | We study the supersymmetric extension of $SO(10)$-inspired thermal leptogenesis showing the constraints on neutrino parameters and on the reheat temperature $T_{\rm RH}$ that derive from the condition of successful leptogenesis from next-to-lightest right handed (RH) neutrinos ($N_2$) decays and the more stringent ones when independence of the initial conditions (strong thermal leptogenesis) is superimposed. In the latter case, the increase of the lightest right-handed neutrino ($N_1$) decay parameters helps the wash-out of a pre-existing asymmetry and constraints relax compared to the non-supersymmetric case. We find significant changes especially in the case of large $\tan\beta$ values $(\gtrsim 15)$. In particular, for normal ordering, the atmospheric mixing angle can now be also maximal. The lightest (ordinary) neutrino mass is still constrained within the range $10 \lesssim m_1/{\rm meV} \lesssim 30$ (corresponding to $75\lesssim \sum_i m_i/{\rm meV} \lesssim 120$). Inverted ordering is still disfavoured, but an allowed region satisfying strong thermal leptogenesis opens up at large $\tan\beta$ values. We also study in detail the lower bound on $T_{\rm RH}$ finding $T_{\rm RH}\gtrsim 1 \times 10^{10}\,{\rm GeV}$ independently of the initial $N_2$ abundance. Finally, we propose a new $N_2$-dominated scenario where the $N_1$ mass is lower than the sphaleron freeze-out temperature. In this case there is no $N_1$ wash-out and we find $T_{\rm RH} \gtrsim 1\times 10^{9}\,{\rm GeV}$. These results indicate that $SO(10)$-inspired thermal leptogenesis can be made compatible with the upper bound from the gravitino problem, an important result in light of the role often played by supersymmetry in the quest of a realistic model of fermion masses. |
1909.05381 | Stefano Dell'Oro | Stefano Dell'Oro, Simone Marcocci and Francesco Vissani | Empirical inference on the Majorana mass of the ordinary neutrinos | null | Phys. Rev. D 100, 073003 (2019) | 10.1103/PhysRevD.100.073003 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | There is a broad theoretical consensus on the idea that ordinary neutrinos
have a Majorana mass, but we have no clear prediction about its value, and
direct experimental measurements of this quantity are rather challenging. In
this work, we argue that the current cosmological measurements allow us to
obtain precise information on the effective Majorana mass, i.e. the
electronic-type mass of ordinary neutrinos. We show that the numerical results
that we obtain can be accurately reproduced, and hence tested, by a
straightforward analytical procedure. We then discuss the stability of the
assumptions at the basis of our analysis and the implications of our findings
for neutrinoless double beta decay.
| [
{
"created": "Wed, 11 Sep 2019 21:25:50 GMT",
"version": "v1"
},
{
"created": "Thu, 10 Oct 2019 17:45:56 GMT",
"version": "v2"
}
] | 2019-10-16 | [
[
"Dell'Oro",
"Stefano",
""
],
[
"Marcocci",
"Simone",
""
],
[
"Vissani",
"Francesco",
""
]
] | There is a broad theoretical consensus on the idea that ordinary neutrinos have a Majorana mass, but we have no clear prediction about its value, and direct experimental measurements of this quantity are rather challenging. In this work, we argue that the current cosmological measurements allow us to obtain precise information on the effective Majorana mass, i.e. the electronic-type mass of ordinary neutrinos. We show that the numerical results that we obtain can be accurately reproduced, and hence tested, by a straightforward analytical procedure. We then discuss the stability of the assumptions at the basis of our analysis and the implications of our findings for neutrinoless double beta decay. |
hep-ph/9309258 | null | Joseph D. Lykken and Scott Willenbrock | Planck-Scale Unification and Dynamical Symmetry Breaking | LaTeX, 12 pages, FERMILAB-PUB-93/262-T | Phys. Rev. D 49, 4902 (1994) | 10.1103/PhysRevD.49.4902 | null | hep-ph | null | We explore the possibility of unification of gauge couplings near the Planck
scale in models of extended technicolor. We observe that models of the form G X
SU(3)_c X SU(2)_L X U(1)_Y cannot be realized, due to the presence of massless
neutral Goldstone bosons (axions) and light charged pseudo-Goldstone bosons;
thus, unification of the known forces near the Planck scale cannot be achieved.
The next simplest possibility, G X SU(4)_{PS} X SU(2)_L X U(1)_{T_{3R}}, cannot
lead to unification of the Pati-Salam and weak gauge groups near the Planck
scale. However, superstring theory provides relations between couplings at the
Planck scale without the need for an underlying grand-unified gauge group,
which allows unification of the SU(4)$_{PS}$ and SU(2)$_L$ couplings.
| [
{
"created": "Mon, 13 Sep 1993 21:16:51 GMT",
"version": "v1"
}
] | 2013-11-13 | [
[
"Lykken",
"Joseph D.",
""
],
[
"Willenbrock",
"Scott",
""
]
] | We explore the possibility of unification of gauge couplings near the Planck scale in models of extended technicolor. We observe that models of the form G X SU(3)_c X SU(2)_L X U(1)_Y cannot be realized, due to the presence of massless neutral Goldstone bosons (axions) and light charged pseudo-Goldstone bosons; thus, unification of the known forces near the Planck scale cannot be achieved. The next simplest possibility, G X SU(4)_{PS} X SU(2)_L X U(1)_{T_{3R}}, cannot lead to unification of the Pati-Salam and weak gauge groups near the Planck scale. However, superstring theory provides relations between couplings at the Planck scale without the need for an underlying grand-unified gauge group, which allows unification of the SU(4)$_{PS}$ and SU(2)$_L$ couplings. |
0910.3671 | Giulia Zanderighi | Kirill Melnikov and Giulia Zanderighi | W+3 jet production at the LHC as a signal or background | 10 pages, 13 figures, OUTP-09-26-P | Phys.Rev.D81:074025,2010 | 10.1103/PhysRevD.81.074025 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We discuss the production of W bosons in association with three jets at the
LHC. We investigate how next-to-leading order QCD corrections modify basic
kinematic distributions of jets and leptons. We also address the magnitude of
NLO QCD effects in W+3 jet observables, relevant for SUSY searches at the LHC.
| [
{
"created": "Mon, 19 Oct 2009 22:38:48 GMT",
"version": "v1"
}
] | 2010-05-12 | [
[
"Melnikov",
"Kirill",
""
],
[
"Zanderighi",
"Giulia",
""
]
] | We discuss the production of W bosons in association with three jets at the LHC. We investigate how next-to-leading order QCD corrections modify basic kinematic distributions of jets and leptons. We also address the magnitude of NLO QCD effects in W+3 jet observables, relevant for SUSY searches at the LHC. |
hep-ph/0103269 | Igor Shovkovy | V. P. Gusynin and I. A. Shovkovy | Carlson-Goldman modes in the color superconducting phase of dense QCD | 5 pages, 2 figures. A few new formulas and references are added, some
numerical errors are corrected, and Fig. 1 is replaced by a new one. To
appear in Phys. Rev. D | Phys.Rev. D64 (2001) 116005 | 10.1103/PhysRevD.64.116005 | NUC-MINN-01/7-T | hep-ph cond-mat.supr-con hep-th nucl-th | null | We predict the existence of the gapless Carlson-Goldman modes in the
color-flavor locked color superconducting phase of dense QCD. These modes
resemble Nambu-Goldstone modes of the superconducting phase below the critical
temperature where the Anderson-Higgs mechanism takes place. These modes exist
in the broken phase in the vicinity of the critical line. Their presence does
not eliminate the Meissner effect. The effect of Landau damping on the width of
the Carlson-Goldman modes is discussed.
| [
{
"created": "Sun, 25 Mar 2001 15:38:02 GMT",
"version": "v1"
},
{
"created": "Tue, 3 Apr 2001 04:09:36 GMT",
"version": "v2"
},
{
"created": "Tue, 21 Aug 2001 14:32:42 GMT",
"version": "v3"
}
] | 2009-11-07 | [
[
"Gusynin",
"V. P.",
""
],
[
"Shovkovy",
"I. A.",
""
]
] | We predict the existence of the gapless Carlson-Goldman modes in the color-flavor locked color superconducting phase of dense QCD. These modes resemble Nambu-Goldstone modes of the superconducting phase below the critical temperature where the Anderson-Higgs mechanism takes place. These modes exist in the broken phase in the vicinity of the critical line. Their presence does not eliminate the Meissner effect. The effect of Landau damping on the width of the Carlson-Goldman modes is discussed. |
1701.02735 | Yue Zhao | Yue Zhao | Cosmology and time dependent parameters induced by misaligned light
scalar | Discussions on recent results from Icecube are added. Acknowledgement
is updated. References are added. Match to published version | Phys. Rev. D 95, 115002 (2017) | 10.1103/PhysRevD.95.115002 | null | hep-ph astro-ph.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We consider a scenario where time dependence on physical parameters is
introduced by the misalignment of an ultra-light scalar field. The initial VEV
of such field at the early time remains a constant until Hubble becomes
comparable to its mass. Interesting cosmological consequences are considered.
Light sterile neutrinos hinted by terrestrial neutrino experiments are studied
as a benchmark model. We show the BBN constraints can be easily avoided in this
scenario, even if reheating temperature is high. The scalar can be naturally
light in spite of its couplings to other fields. Parameters of sterile neutrino
may remain changing with time nowadays. This can further relax the tension from
the recent IceCube constraints.
| [
{
"created": "Tue, 10 Jan 2017 19:00:01 GMT",
"version": "v1"
},
{
"created": "Sun, 14 May 2017 01:11:07 GMT",
"version": "v2"
}
] | 2017-06-07 | [
[
"Zhao",
"Yue",
""
]
] | We consider a scenario where time dependence on physical parameters is introduced by the misalignment of an ultra-light scalar field. The initial VEV of such field at the early time remains a constant until Hubble becomes comparable to its mass. Interesting cosmological consequences are considered. Light sterile neutrinos hinted by terrestrial neutrino experiments are studied as a benchmark model. We show the BBN constraints can be easily avoided in this scenario, even if reheating temperature is high. The scalar can be naturally light in spite of its couplings to other fields. Parameters of sterile neutrino may remain changing with time nowadays. This can further relax the tension from the recent IceCube constraints. |
1001.1157 | Miguel Costa S | Lorenzo Cornalba, Miguel S. Costa, Joao Penedones | AdS black disk model for small-x DIS | 5 pages. Minor corrections | Phys.Rev.Lett.105:072003,2010 | 10.1103/PhysRevLett.105.072003 | NSF-KITP-10-004 | hep-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Using the approximate conformal invariance of QCD at high energies we
consider a simple AdS black disk model to describe saturation in DIS. Deep
inside saturation the structure functions have the same power law scaling, F_T
~ F_L ~ 1/x^w, where w is related to the expansion rate of the black disk with
energy. Furthermore, the ratio F_L /F_T is given by the universal value
(1+w)/(3+w), independently of the target. For virtual photon-photon scattering
at high energies we obtain explicit expressions and ratios for the total cross
sections of transverse and longitudinal photons in terms of the single
parameter w.
| [
{
"created": "Thu, 7 Jan 2010 21:40:49 GMT",
"version": "v1"
},
{
"created": "Tue, 8 Mar 2011 17:44:12 GMT",
"version": "v2"
}
] | 2011-03-09 | [
[
"Cornalba",
"Lorenzo",
""
],
[
"Costa",
"Miguel S.",
""
],
[
"Penedones",
"Joao",
""
]
] | Using the approximate conformal invariance of QCD at high energies we consider a simple AdS black disk model to describe saturation in DIS. Deep inside saturation the structure functions have the same power law scaling, F_T ~ F_L ~ 1/x^w, where w is related to the expansion rate of the black disk with energy. Furthermore, the ratio F_L /F_T is given by the universal value (1+w)/(3+w), independently of the target. For virtual photon-photon scattering at high energies we obtain explicit expressions and ratios for the total cross sections of transverse and longitudinal photons in terms of the single parameter w. |
hep-ph/9406321 | Marc de Montigny | M. de Montigny, L. Marleau, and G. Simon | Production of Pairs of Sleptoquarks in Hadron Colliders | 8 pages, REVTEX, (1 fig. available on request),
LAVAL-PHY-94-13/McGILL-94-26/SPhT-94-072 | Phys.Rev. D52 (1995) 533-536 | 10.1103/PhysRevD.52.533 | null | hep-ph | null | We calculate the cross section for the production of pairs of scalar
leptoquarks (sleptoquarks) in a supersymmetric $E_6$ model, at hadron
colliders. We estimate higher order corrections by including $\pi^2$ terms
induced by soft-gluon corrections. Discovery bounds on the sleptoquark mass are
estimated at collider energies of 1.8, 2, and 4 TeV (Tevatron), and 16 TeV
(LHC).
| [
{
"created": "Wed, 15 Jun 1994 18:56:13 GMT",
"version": "v1"
}
] | 2009-10-28 | [
[
"de Montigny",
"M.",
""
],
[
"Marleau",
"L.",
""
],
[
"Simon",
"G.",
""
]
] | We calculate the cross section for the production of pairs of scalar leptoquarks (sleptoquarks) in a supersymmetric $E_6$ model, at hadron colliders. We estimate higher order corrections by including $\pi^2$ terms induced by soft-gluon corrections. Discovery bounds on the sleptoquark mass are estimated at collider energies of 1.8, 2, and 4 TeV (Tevatron), and 16 TeV (LHC). |
1309.7995 | Nobuo Sato | Nobuo Sato | Threshold resummation in direct photon production and its implications
on the large-x gluon PDF | "Presentation at the DPF 2013 Meeting of the American Physical
Society Division of Particles and Fields, Santa Cruz, California, August
13-17, 2013." | null | null | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Currently, the gluon distribution function is mainly constrained by jet data.
Yet, its high-x behaviour is largely unknown. This kinematic region is
important, for instance, for the understanding of the production of a massive
state at forward rapidities at the LHC. In the past, single inclusive direct
photon data from fixed target experiments was used to constrain the gluon
distribution due to its dominant contribution from the $qg \rightarrow\gamma q$
subprocess in proton-proton collisions. Due to disagreement with its
theoretical predictions at next-to-leading order (NLO) in perturbative QCD
(pQCD), direct photon data have been excluded from global fits. This talk will
discuss an improvement to such theoretical predictions by including
\emph{threshold resummation} at next-to-leading logarithmic accuracy (NLL) and
its impact on gluon distribution at large-x using Bayesian reweighting
technique.
| [
{
"created": "Mon, 30 Sep 2013 19:57:27 GMT",
"version": "v1"
}
] | 2013-10-01 | [
[
"Sato",
"Nobuo",
""
]
] | Currently, the gluon distribution function is mainly constrained by jet data. Yet, its high-x behaviour is largely unknown. This kinematic region is important, for instance, for the understanding of the production of a massive state at forward rapidities at the LHC. In the past, single inclusive direct photon data from fixed target experiments was used to constrain the gluon distribution due to its dominant contribution from the $qg \rightarrow\gamma q$ subprocess in proton-proton collisions. Due to disagreement with its theoretical predictions at next-to-leading order (NLO) in perturbative QCD (pQCD), direct photon data have been excluded from global fits. This talk will discuss an improvement to such theoretical predictions by including \emph{threshold resummation} at next-to-leading logarithmic accuracy (NLL) and its impact on gluon distribution at large-x using Bayesian reweighting technique. |
hep-ph/0101064 | Ruben A. Alanakyan | R.A. Alanakyan | Long-Range Interactions of the Ball | 4 pages, LaTeX file | null | null | Preprint YeRPHI-1563(12)-2000 | hep-ph | null | In model independent way considered long-range interactions of the
macroscopic objects under assumption that any particle of this objects interact
with probe particle as $ A/r^n$. Also presented model-independent corrections
to the Coulomb energy levels from regularised version of the potential $
A/r^n$.
| [
{
"created": "Mon, 8 Jan 2001 17:08:02 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Alanakyan",
"R. A.",
""
]
] | In model independent way considered long-range interactions of the macroscopic objects under assumption that any particle of this objects interact with probe particle as $ A/r^n$. Also presented model-independent corrections to the Coulomb energy levels from regularised version of the potential $ A/r^n$. |
hep-ph/0112162 | Todd Fugleberg | Todd D. Fugleberg | Color Superconductivity with Non-Degenerate Quarks | 26 pages, 7 epsi figures, LaTeX | null | null | BNL-NT-01/31 | hep-ph nucl-th | null | In dense quark matter, the response of the color superconducting gaps to a
small variation, $\delta\mu$, in the chemical potential of the strange quark
was studied. The approximation of three massless flavors of quarks and a
general ansatz for the color flavor structure of the gap matrix was used. The
general pole structure of the quasi-particle propagator in this ansatz is
presented. The gap equation was solved using both an NJL interaction model and
perturbative single gluon exchange at moderate densities and results are
presented for varying values of $\delta\mu$. Quantitative and qualitative
differences in the dependence of the gaps on $\delta\mu$ were found.
| [
{
"created": "Wed, 12 Dec 2001 18:20:39 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Fugleberg",
"Todd D.",
""
]
] | In dense quark matter, the response of the color superconducting gaps to a small variation, $\delta\mu$, in the chemical potential of the strange quark was studied. The approximation of three massless flavors of quarks and a general ansatz for the color flavor structure of the gap matrix was used. The general pole structure of the quasi-particle propagator in this ansatz is presented. The gap equation was solved using both an NJL interaction model and perturbative single gluon exchange at moderate densities and results are presented for varying values of $\delta\mu$. Quantitative and qualitative differences in the dependence of the gaps on $\delta\mu$ were found. |
hep-ph/9907509 | Matthias Steinhauser | K.G. Chetyrkin and M. Steinhauser | Short Distance Mass of a Heavy Quark at Order \alpha_s^3 | Latex, 5 pages | Phys.Rev.Lett.83:4001-4004,1999 | 10.1103/PhysRevLett.83.4001 | BUTP-99/15, TTP99-33 | hep-ph | null | The relation between the on-shell quark mass and the mass defined in the
modified minimal subtraction scheme is computed up to order \alpha_s^3.
Implications for the numerical values of the top and bottom quark masses are
discussed. We show that the new three-loop correction significantly reduces the
theoretical uncertainty in the determination of the quark masses.
| [
{
"created": "Tue, 27 Jul 1999 10:01:32 GMT",
"version": "v1"
}
] | 2010-04-06 | [
[
"Chetyrkin",
"K. G.",
""
],
[
"Steinhauser",
"M.",
""
]
] | The relation between the on-shell quark mass and the mass defined in the modified minimal subtraction scheme is computed up to order \alpha_s^3. Implications for the numerical values of the top and bottom quark masses are discussed. We show that the new three-loop correction significantly reduces the theoretical uncertainty in the determination of the quark masses. |
hep-ph/9612357 | F. Simkovic | Amand Faessler, Sergey Kovalenko, Fedor Simkovic, and Joerg Schwieger | Dominance of Pion-exchange in R-parity Violating Supersymmetry
Contributions to Neutrinoless Double Beta Decay | 6 pages, RevTex, 2 Postscript figures, to appear in Phys. Rev. Lett | Phys.Rev.Lett. 78 (1997) 183-186 | 10.1103/PhysRevLett.78.183 | null | hep-ph nucl-th | null | We present a new contribution of the R-parity violating supersymmetry (SUSY)
to neutrinoless double beta decay via the pion exchange between decaying
neutrons. The pion coupling to the final state electrons is induced by the
R-parity violating SUSY interactions. We have found this pion-exchange
mechanism to dominate over the conventional two-nucleon one. The latter
corresponds to direct interaction between quarks from two decaying neutrons
without any light hadronic mediator like pion. The constraints on the certain
R-parity violating SUSY parameters are extracted from the current experimental
neutrinoless double beta decay half-life limit. These constraints are
significantly stronger than those previously known or expected from the ongoing
accelerator experiments.
| [
{
"created": "Fri, 13 Dec 1996 19:50:51 GMT",
"version": "v1"
}
] | 2009-10-30 | [
[
"Faessler",
"Amand",
""
],
[
"Kovalenko",
"Sergey",
""
],
[
"Simkovic",
"Fedor",
""
],
[
"Schwieger",
"Joerg",
""
]
] | We present a new contribution of the R-parity violating supersymmetry (SUSY) to neutrinoless double beta decay via the pion exchange between decaying neutrons. The pion coupling to the final state electrons is induced by the R-parity violating SUSY interactions. We have found this pion-exchange mechanism to dominate over the conventional two-nucleon one. The latter corresponds to direct interaction between quarks from two decaying neutrons without any light hadronic mediator like pion. The constraints on the certain R-parity violating SUSY parameters are extracted from the current experimental neutrinoless double beta decay half-life limit. These constraints are significantly stronger than those previously known or expected from the ongoing accelerator experiments. |
2209.12321 | Alexei P. Martynenko | R.N. Faustov, A.P. Martynenko, F.A. Martynenko | Relativistic corrections to paired production of charmonium and
bottomonium in decays of the Higgs boson | 20 pages, 5 figures | null | 10.1103/PhysRevD.107.056002 | null | hep-ph | http://creativecommons.org/licenses/by/4.0/ | Rare decay process of the Higgs boson into a pair of $J/\Psi$ and $\Upsilon$
particles is studied within perturbative Standard Model and relativistic quark
model. The relativistic corrections connected with the relative motion of
quarks are calculated in the production amplitude and the wave functions of the
bound states. Numerical values of the decay widths of the Higgs boson are
obtained, which can be used for comparison with experimental data.
| [
{
"created": "Sun, 25 Sep 2022 21:19:56 GMT",
"version": "v1"
}
] | 2023-03-15 | [
[
"Faustov",
"R. N.",
""
],
[
"Martynenko",
"A. P.",
""
],
[
"Martynenko",
"F. A.",
""
]
] | Rare decay process of the Higgs boson into a pair of $J/\Psi$ and $\Upsilon$ particles is studied within perturbative Standard Model and relativistic quark model. The relativistic corrections connected with the relative motion of quarks are calculated in the production amplitude and the wave functions of the bound states. Numerical values of the decay widths of the Higgs boson are obtained, which can be used for comparison with experimental data. |
1906.02369 | Andrea Erdas | Andrea Erdas and Zachary Metzler | Magnetic field effects on neutrino oscillations | 8 pages, 2 figures. arXiv admin note: text overlap with
arXiv:0908.4297 | Int.J.Mod.Phys.A 34 (2019) 23, 1950121 | 10.1142/S0217751X19501215 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Using the exact propagators in a constant magnetic field, the neutrino
self-energy has been calculated to all orders in the field strength $B$ within
the minimal extension of the Weinberg-Salam model with massive Dirac neutrinos.
A neutrino dispersion relation, effective potential and effective mass have
been obtained that depend on $B$. The consequences of this effective potential
on neutrino oscillations have been explored, and resonance conditions have been
obtained for magnetic fields $0<eB \le 4m^2_e$, where $e$ is the elementary
charge and $m_e$ is the electron mass. The oscillation length has also been
obtained, showing that $\nu_e$-$\nu_\mu$ resonant oscillations in magnetic
field are likely to occur in the proximity of most stars generating high
magnetic fields.
| [
{
"created": "Thu, 6 Jun 2019 00:57:01 GMT",
"version": "v1"
},
{
"created": "Fri, 23 Aug 2019 02:41:57 GMT",
"version": "v2"
}
] | 2020-11-03 | [
[
"Erdas",
"Andrea",
""
],
[
"Metzler",
"Zachary",
""
]
] | Using the exact propagators in a constant magnetic field, the neutrino self-energy has been calculated to all orders in the field strength $B$ within the minimal extension of the Weinberg-Salam model with massive Dirac neutrinos. A neutrino dispersion relation, effective potential and effective mass have been obtained that depend on $B$. The consequences of this effective potential on neutrino oscillations have been explored, and resonance conditions have been obtained for magnetic fields $0<eB \le 4m^2_e$, where $e$ is the elementary charge and $m_e$ is the electron mass. The oscillation length has also been obtained, showing that $\nu_e$-$\nu_\mu$ resonant oscillations in magnetic field are likely to occur in the proximity of most stars generating high magnetic fields. |
1102.2194 | Ralf Rapp | Xingbo Zhao and Ralf Rapp | Medium Modifications and Production of Charmonia at LHC | 7 pages, 9 eps figures | null | 10.1016/j.nuclphysa.2011.05.001 | null | hep-ph nucl-ex nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A previously constructed transport approach to calculate the evolution of
quarkonium yields and spectra in heavy-ion collisions is applied to
Pb-Pb($\sqrt{s}$=2.76\,ATeV) collisions at the Large Hadron Collider (LHC). In
this approach spectral properties of charmonia are constrained by euclidean
correlators from thermal lattice QCD and subsequently implemented into a
Boltzmann equation accounting for both suppression and regeneration reactions.
Based on a fair description of SPS and RHIC data, we provide predictions for
the centrality dependence of $J/\psi$ yields at LHC. The main uncertainty is
associated with the input charm cross section, in particular its hitherto
unknown reduction due to shadowing in nuclear collisions. Incomplete
charm-quark thermalization and non-equilibrium in charmonium chemistry entail a
marked reduction of the regeneration yield compared to the statistical
equilibrium limit.
| [
{
"created": "Thu, 10 Feb 2011 18:28:17 GMT",
"version": "v1"
}
] | 2015-05-27 | [
[
"Zhao",
"Xingbo",
""
],
[
"Rapp",
"Ralf",
""
]
] | A previously constructed transport approach to calculate the evolution of quarkonium yields and spectra in heavy-ion collisions is applied to Pb-Pb($\sqrt{s}$=2.76\,ATeV) collisions at the Large Hadron Collider (LHC). In this approach spectral properties of charmonia are constrained by euclidean correlators from thermal lattice QCD and subsequently implemented into a Boltzmann equation accounting for both suppression and regeneration reactions. Based on a fair description of SPS and RHIC data, we provide predictions for the centrality dependence of $J/\psi$ yields at LHC. The main uncertainty is associated with the input charm cross section, in particular its hitherto unknown reduction due to shadowing in nuclear collisions. Incomplete charm-quark thermalization and non-equilibrium in charmonium chemistry entail a marked reduction of the regeneration yield compared to the statistical equilibrium limit. |
hep-ph/9807480 | Bernd Kniehl | A.A. Barrientos Bendezu, B.A. Kniehl (MPI Munich) | W^+- H^-+ Associated Production at the Large Hadron Collider | 16 pages (Latex), 8 figures (Postscript) | Phys.Rev.D59:015009,1999 | 10.1103/PhysRevD.59.015009 | MPI/PhT/98-054 | hep-ph hep-ex | null | We study the production of a charged Higgs boson in association with a W
boson at the CERN Large Hadron Collider in the context of the minimal
supersymmetric extension of the standard model. This production mechanism is
particularly promising if the charged Higgs boson is too heavy to be generated
by top-quark decay. We compare the contributions due to b b-bar annihilation at
the tree level and gg fusion, which proceeds at one loop. Apart from the total
cross section, we also consider distributions in transverse momentum and
rapidity. We also assess the viability of W^+- H^-+ associated production at
the Fermilab Tevatron after the installation of the Main Injector and the
Recycler.
| [
{
"created": "Thu, 23 Jul 1998 15:50:53 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Bendezu",
"A. A. Barrientos",
"",
"MPI Munich"
],
[
"Kniehl",
"B. A.",
"",
"MPI Munich"
]
] | We study the production of a charged Higgs boson in association with a W boson at the CERN Large Hadron Collider in the context of the minimal supersymmetric extension of the standard model. This production mechanism is particularly promising if the charged Higgs boson is too heavy to be generated by top-quark decay. We compare the contributions due to b b-bar annihilation at the tree level and gg fusion, which proceeds at one loop. Apart from the total cross section, we also consider distributions in transverse momentum and rapidity. We also assess the viability of W^+- H^-+ associated production at the Fermilab Tevatron after the installation of the Main Injector and the Recycler. |
1803.00820 | Jongkuk Kim | Ki-Young Choi, Sin Kyu Kang, Jongkuk Kim | Non-thermal WIMP baryogenesis | 5 pages, 6 figures | null | 10.1016/j.physletb.2018.05.083 | null | hep-ph astro-ph.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We propose a WIMP baryogensis achieved by the annihilation of non-thermally
produced WIMPs from decay of heavy particles, which can result in low reheating
temerature. Dark matter (DM) can be produced non-thermally during a reheating
period created by the decay of long-lived heavy particle, and subsequently
re-annihilate to lighter particles even after the thermal freeze-out. The
re-annihilation of DM provides the observed baryon asymmetry as well as the
correct relic density of DM. We investigate how wahout effects can affect the
generation of the baryon asymmetry and study a model suppressing them. In this
scenario, we find that DM can be heavy enough and its annihilation cross
section can also be larger than that adopted in the usual thermal WIMP
baryogenesis.
| [
{
"created": "Fri, 2 Mar 2018 12:13:51 GMT",
"version": "v1"
},
{
"created": "Mon, 25 Jun 2018 14:45:39 GMT",
"version": "v2"
}
] | 2018-06-26 | [
[
"Choi",
"Ki-Young",
""
],
[
"Kang",
"Sin Kyu",
""
],
[
"Kim",
"Jongkuk",
""
]
] | We propose a WIMP baryogensis achieved by the annihilation of non-thermally produced WIMPs from decay of heavy particles, which can result in low reheating temerature. Dark matter (DM) can be produced non-thermally during a reheating period created by the decay of long-lived heavy particle, and subsequently re-annihilate to lighter particles even after the thermal freeze-out. The re-annihilation of DM provides the observed baryon asymmetry as well as the correct relic density of DM. We investigate how wahout effects can affect the generation of the baryon asymmetry and study a model suppressing them. In this scenario, we find that DM can be heavy enough and its annihilation cross section can also be larger than that adopted in the usual thermal WIMP baryogenesis. |
2311.17169 | Yi Chung | Yi Chung, Florian Goertz | Third-generation-philic Hidden Naturalness | 9 pages, 1 figure | null | null | null | hep-ph | http://creativecommons.org/licenses/by/4.0/ | We present a solution to the electroweak hierarchy problem, where the
relevant new particles are third-generation-philic and hidden in SM processes
with third-generation fermions. Due to this feature, the mass bounds from
direct searches are much weaker and the required fine-tuning can be reduced
drastically. A concrete model is constructed based on a $SU(6)/Sp(6)$
fundamental composite Higgs model with collective symmetry breaking and
extended hypercolor mechanism. The construction allows to raise the scale $f$
to $\sim 3\,$TeV, corresponding to resonances at $M_\rho \gtrsim 10$ TeV,
without much tuning - employing ingredients that are naturally inherent in the
(composite) Goldstone-Higgs framework. The experimental signatures are
discussed in detail. It is found that current bounds allow for a model with
negligible tuning.
| [
{
"created": "Tue, 28 Nov 2023 19:03:47 GMT",
"version": "v1"
}
] | 2023-11-30 | [
[
"Chung",
"Yi",
""
],
[
"Goertz",
"Florian",
""
]
] | We present a solution to the electroweak hierarchy problem, where the relevant new particles are third-generation-philic and hidden in SM processes with third-generation fermions. Due to this feature, the mass bounds from direct searches are much weaker and the required fine-tuning can be reduced drastically. A concrete model is constructed based on a $SU(6)/Sp(6)$ fundamental composite Higgs model with collective symmetry breaking and extended hypercolor mechanism. The construction allows to raise the scale $f$ to $\sim 3\,$TeV, corresponding to resonances at $M_\rho \gtrsim 10$ TeV, without much tuning - employing ingredients that are naturally inherent in the (composite) Goldstone-Higgs framework. The experimental signatures are discussed in detail. It is found that current bounds allow for a model with negligible tuning. |
hep-ph/0312102 | Marc Vanderhaeghen | Chung-Wen Kao, Dieter Drechsel, Sabit Kamalov, Marc Vanderhaeghen | Higher moments of nucleon spin structure functions in heavy baryon
chiral perturbation theory and in a resonance model | 30 pages, 7 figures | Phys.Rev.D69:056004,2004 | 10.1103/PhysRevD.69.056004 | JLAB-THY-03-199 / WM-03-110 | hep-ph | null | The third moment $d_2$ of the twist-3 part of the nucleon spin structure
function $g_2$ is generalized to arbitrary momentum transfer $Q^2$ and is
evaluated in heavy baryon chiral perturbation theory (HBChPT) up to order
${\mathcal{O}}(p^4)$ and in a unitary isobar model (MAID). We show how to link
$d_2$ as well as higher moments of the nucleon spin structure functions $g_1$
and $g_2$ to nucleon spin polarizabilities. We compare our results with the
most recent experimental data, and find a good description of these available
data within the unitary isobar model. We proceed to extract the twist-4 matrix
element $f_2$ which appears in the $1/Q^2$ suppressed term in the twist
expansion of the spin structure function $g_1$ for proton and neutron.
| [
{
"created": "Mon, 8 Dec 2003 05:35:24 GMT",
"version": "v1"
}
] | 2014-11-17 | [
[
"Kao",
"Chung-Wen",
""
],
[
"Drechsel",
"Dieter",
""
],
[
"Kamalov",
"Sabit",
""
],
[
"Vanderhaeghen",
"Marc",
""
]
] | The third moment $d_2$ of the twist-3 part of the nucleon spin structure function $g_2$ is generalized to arbitrary momentum transfer $Q^2$ and is evaluated in heavy baryon chiral perturbation theory (HBChPT) up to order ${\mathcal{O}}(p^4)$ and in a unitary isobar model (MAID). We show how to link $d_2$ as well as higher moments of the nucleon spin structure functions $g_1$ and $g_2$ to nucleon spin polarizabilities. We compare our results with the most recent experimental data, and find a good description of these available data within the unitary isobar model. We proceed to extract the twist-4 matrix element $f_2$ which appears in the $1/Q^2$ suppressed term in the twist expansion of the spin structure function $g_1$ for proton and neutron. |
2401.17843 | Michael Fucilla | Michael Fucilla, Maxim A. Nefedov, Alessandro Papa | On the breakdown of eikonal approximation and survival of Reggeization
in presence of dimension-5 Higgs-gluon coupling | 46 pages, 12 Figures, version published in JHEP | null | null | null | hep-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We consider the one-loop effective vertex for the interaction of a gluon with
a Reggeized gluon and a Higgs boson in the infinite-top-mass limit, which is
described by a dimension-5 non-renormalizable operator. This vertex enters the
calculation of differential cross sections for the forward inclusive production
of a Higgs boson in high-energy proton-proton collisions, possibly in
association with a backward jet or identified hadron, in a framework where
next-to-leading logarithms of the energy are resummed to all orders. The
effective vertex is extracted from the high-energy behavior of two-to-two
amplitudes for the Higgs production in parton-parton collisions and relies on
the validity of the Regge form for these amplitudes. We find that the usual
eikonal approximation (Gribov prescription) for the Regge limit and the known
region-expansion technique in this limit lead to an incomplete result for the
amplitude. The discrepancy is traced back to the non-renormalizable nature of
the involved operator. However, the Regge limit of the exact QCD amplitude
agrees with the Regge-pole exchange form at one loop, nontrivially supporting
the Reggeization hypothesis.
| [
{
"created": "Wed, 31 Jan 2024 14:03:15 GMT",
"version": "v1"
},
{
"created": "Mon, 5 Feb 2024 14:10:21 GMT",
"version": "v2"
},
{
"created": "Tue, 16 Apr 2024 18:03:33 GMT",
"version": "v3"
}
] | 2024-04-18 | [
[
"Fucilla",
"Michael",
""
],
[
"Nefedov",
"Maxim A.",
""
],
[
"Papa",
"Alessandro",
""
]
] | We consider the one-loop effective vertex for the interaction of a gluon with a Reggeized gluon and a Higgs boson in the infinite-top-mass limit, which is described by a dimension-5 non-renormalizable operator. This vertex enters the calculation of differential cross sections for the forward inclusive production of a Higgs boson in high-energy proton-proton collisions, possibly in association with a backward jet or identified hadron, in a framework where next-to-leading logarithms of the energy are resummed to all orders. The effective vertex is extracted from the high-energy behavior of two-to-two amplitudes for the Higgs production in parton-parton collisions and relies on the validity of the Regge form for these amplitudes. We find that the usual eikonal approximation (Gribov prescription) for the Regge limit and the known region-expansion technique in this limit lead to an incomplete result for the amplitude. The discrepancy is traced back to the non-renormalizable nature of the involved operator. However, the Regge limit of the exact QCD amplitude agrees with the Regge-pole exchange form at one loop, nontrivially supporting the Reggeization hypothesis. |
2102.13390 | Diego Guadagnoli | Alexandre Carvunis, Francesco Dettori, Shireen Gangal, Diego
Guadagnoli, Camille Normand | On the effective lifetime of $B_s \to \mu \mu \gamma$ | 37 pages, 8 figures, 3 tables. v4: major overhaul of numerics,
because of inclusion of new form-factor parameterization made available in
the literature; added appendix D on analytic argument for near-cancellation
of broad-charmonium uncertainties; main conclusions unchanged. Matches
journal version | JHEP 12 (2021) 078 | 10.1007/JHEP12(2021)078 | CERN-TH-2021-026, LAPTH-010/21 | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We consider the $B^0_s \to \mu^{+} \mu^{-} \gamma$ effective lifetime, and
the related CP-phase sensitive quantity $A_{\Delta\Gamma_s}^{\mu \mu \gamma}$,
as a way to obtain qualitatively new insights on the current $B$-decay
discrepancies. Through a fit comparing pre- to post-Moriond-2021 data we
identify a few theory benchmark scenarios addressing these discrepancies, and
featuring large CP violation in addition. We then explore the possibility of
telling apart these scenarios with $A_{\Delta\Gamma_s}^{\mu \mu \gamma}$, once
resonance-modeling and form-factor uncertainties are taken into account. We do
so in both regions of low and high invariant di-lepton mass-squared $q^2$. For
low $q^2$, we show how to shape the integration range in order to reduce the
impact of the $\phi$-resonance modelling on the $A_{\Delta\Gamma_s}^{\mu \mu
\gamma}$ prediction. For high $q^2$, we find that the corresponding pollution
from broad-charmonium resonances has a surprisingly small effect on
$A_{\Delta\Gamma_s}^{\mu \mu \gamma}$. This is due to a number of
cancellations, that can be traced back to the complete dominance of
semi-leptonic operator contributions for high $q^2$ -- at variance with low
$q^2$ -- and to $A_{\Delta\Gamma_s}^{\mu \mu \gamma}$ behaving like a
ratio-of-amplitudes observable. Our study suggests that
$A_{\Delta\Gamma_s}^{\mu \mu \gamma}$ is -- especially at high $q^2$ -- a
potentially valuable probe of short-distance CP-violating effects in the very
same Wilson coefficients that are associated to current $b \to s$
discrepancies. Its discriminating power, however, relies on progress in
form-factor uncertainties. Interestingly, high $q^2$ is the region where $B^0_s
\to \mu^{+} \mu^{-} \gamma$ is already being accessed experimentally, and the
region where form factors are more accessible through non-perturbative QCD
methods.
| [
{
"created": "Fri, 26 Feb 2021 10:56:45 GMT",
"version": "v1"
},
{
"created": "Thu, 25 Mar 2021 18:29:01 GMT",
"version": "v2"
},
{
"created": "Thu, 29 Apr 2021 08:11:25 GMT",
"version": "v3"
},
{
"created": "Tue, 21 Dec 2021 22:18:26 GMT",
"version": "v4"
}
] | 2021-12-23 | [
[
"Carvunis",
"Alexandre",
""
],
[
"Dettori",
"Francesco",
""
],
[
"Gangal",
"Shireen",
""
],
[
"Guadagnoli",
"Diego",
""
],
[
"Normand",
"Camille",
""
]
] | We consider the $B^0_s \to \mu^{+} \mu^{-} \gamma$ effective lifetime, and the related CP-phase sensitive quantity $A_{\Delta\Gamma_s}^{\mu \mu \gamma}$, as a way to obtain qualitatively new insights on the current $B$-decay discrepancies. Through a fit comparing pre- to post-Moriond-2021 data we identify a few theory benchmark scenarios addressing these discrepancies, and featuring large CP violation in addition. We then explore the possibility of telling apart these scenarios with $A_{\Delta\Gamma_s}^{\mu \mu \gamma}$, once resonance-modeling and form-factor uncertainties are taken into account. We do so in both regions of low and high invariant di-lepton mass-squared $q^2$. For low $q^2$, we show how to shape the integration range in order to reduce the impact of the $\phi$-resonance modelling on the $A_{\Delta\Gamma_s}^{\mu \mu \gamma}$ prediction. For high $q^2$, we find that the corresponding pollution from broad-charmonium resonances has a surprisingly small effect on $A_{\Delta\Gamma_s}^{\mu \mu \gamma}$. This is due to a number of cancellations, that can be traced back to the complete dominance of semi-leptonic operator contributions for high $q^2$ -- at variance with low $q^2$ -- and to $A_{\Delta\Gamma_s}^{\mu \mu \gamma}$ behaving like a ratio-of-amplitudes observable. Our study suggests that $A_{\Delta\Gamma_s}^{\mu \mu \gamma}$ is -- especially at high $q^2$ -- a potentially valuable probe of short-distance CP-violating effects in the very same Wilson coefficients that are associated to current $b \to s$ discrepancies. Its discriminating power, however, relies on progress in form-factor uncertainties. Interestingly, high $q^2$ is the region where $B^0_s \to \mu^{+} \mu^{-} \gamma$ is already being accessed experimentally, and the region where form factors are more accessible through non-perturbative QCD methods. |
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