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|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
1109.6532
|
Raju Venugopalan
|
Raju Venugopalan (BNL)
|
Computing Early-time Dynamics in Heavy Ion Collisions: Status, Problems
and Prospects
|
10 pages, Invited Talk, Workshop on "QCD evolution of parton
distributions: from collinear to non-collinear case", Newport News, VA, 8 - 9
Apr 2011
| null |
10.1142/S2010194511001541
| null |
hep-ph hep-th nucl-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We discuss some recent developments towards a quantitative understanding of
the production and early-time evolution of bulk quark-gluon matter in
ultrarelativistic heavy ion collisions.
|
[
{
"created": "Thu, 29 Sep 2011 14:14:18 GMT",
"version": "v1"
}
] |
2015-05-30
|
[
[
"Venugopalan",
"Raju",
"",
"BNL"
]
] |
We discuss some recent developments towards a quantitative understanding of the production and early-time evolution of bulk quark-gluon matter in ultrarelativistic heavy ion collisions.
|
1108.5769
|
Soumitra Nandi
|
Soumitra Nandi and David London
|
$B_s (\bar B_s)$ -> $D^0_{CP} K {\bar K}$: Detecting and Discriminating
New Physics in $B_s$-$\bar B_s$ Mixing
|
v2: 15 pages, revised argument in section 4, results unchanged,
reference added
| null |
10.1103/PhysRevD.85.114015
| null |
hep-ph hep-ex
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
If the weak phase of B_s-anti B_s mixing (2 beta_s) is found to be
significantly different from zero, this is a clear signal of new physics (NP).
However, if such a signal is found, we would like an unambiguous determination
of 2 beta_s in order to ascertain which NP models could be responsible. In
addition, in the presence of NP, the width difference \Delta\Gamma_s between
the two B_s mass eigenstates can be positive or negative, and ideally this sign
ambiguity should be resolved experimentally. Finally, in order to see if the NP
is contributing to \Gamma^s_{12} in addition to M^s_{12}, the precise
measurement of |\Gamma^s_{12}| is crucial. In this paper, we consider several
different methods of measuring B_s-anti B_s mixing using two- and three-body
decays with ${\bar b} \to {\bar c} u {\bar s}$ and ${\bar b} \to {\bar u} c
{\bar s}$ transitions. We find that the most promising of these is a
time-dependent Dalitz-plot analysis of $B_s (\bar B_s) \to D^0_{CP} K {\bar
K}$. With these decays, all of the above issues can be addressed, and the
measurement of the weak phase gamma is also possible. We also note that, with
all three-body decays it is possible to resolve the sign ambiguity of
\Delta\Gamma_s even without determining the CP phase phi_s.
|
[
{
"created": "Mon, 29 Aug 2011 21:53:01 GMT",
"version": "v1"
},
{
"created": "Mon, 19 Mar 2012 19:23:06 GMT",
"version": "v2"
}
] |
2013-05-30
|
[
[
"Nandi",
"Soumitra",
""
],
[
"London",
"David",
""
]
] |
If the weak phase of B_s-anti B_s mixing (2 beta_s) is found to be significantly different from zero, this is a clear signal of new physics (NP). However, if such a signal is found, we would like an unambiguous determination of 2 beta_s in order to ascertain which NP models could be responsible. In addition, in the presence of NP, the width difference \Delta\Gamma_s between the two B_s mass eigenstates can be positive or negative, and ideally this sign ambiguity should be resolved experimentally. Finally, in order to see if the NP is contributing to \Gamma^s_{12} in addition to M^s_{12}, the precise measurement of |\Gamma^s_{12}| is crucial. In this paper, we consider several different methods of measuring B_s-anti B_s mixing using two- and three-body decays with ${\bar b} \to {\bar c} u {\bar s}$ and ${\bar b} \to {\bar u} c {\bar s}$ transitions. We find that the most promising of these is a time-dependent Dalitz-plot analysis of $B_s (\bar B_s) \to D^0_{CP} K {\bar K}$. With these decays, all of the above issues can be addressed, and the measurement of the weak phase gamma is also possible. We also note that, with all three-body decays it is possible to resolve the sign ambiguity of \Delta\Gamma_s even without determining the CP phase phi_s.
|
1405.6698
|
Jacques Soffer
|
Claude Bourrely, Jacques Soffer and Tai Tsun Wu
|
Do we understand near-forward elastic scattering up to TeV energies?
|
14 pages, 6 figures, Contribution to the special issue of the
International Journal of Modern Physics A on "Elastic and diffractive
scattering" coordinated by Christophe Royon
| null |
10.1142/S0217751X15420063
|
CERN-PH-TH-2014-077
|
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
In 1970, on purely theoretical grounds, all total hadronic total cross
sections were predicted to increase without limit for higher and higher
energies. This was contrary to the conventional belief at that time. In 1978,
an accurate phenomenological model was formulated for the case of proton-proton
and antiproton-proton interactions. The parameters for this model were slightly
improved in 1984 using the additional available experimental data. Since then,
for thirty years these parameters have not changed. This development, including
especially the difficult task of formulating this phenomenological model and
the comparison of the predictions of this model with later experimental
results, is summarized.
|
[
{
"created": "Mon, 26 May 2014 19:51:00 GMT",
"version": "v1"
}
] |
2015-06-19
|
[
[
"Bourrely",
"Claude",
""
],
[
"Soffer",
"Jacques",
""
],
[
"Wu",
"Tai Tsun",
""
]
] |
In 1970, on purely theoretical grounds, all total hadronic total cross sections were predicted to increase without limit for higher and higher energies. This was contrary to the conventional belief at that time. In 1978, an accurate phenomenological model was formulated for the case of proton-proton and antiproton-proton interactions. The parameters for this model were slightly improved in 1984 using the additional available experimental data. Since then, for thirty years these parameters have not changed. This development, including especially the difficult task of formulating this phenomenological model and the comparison of the predictions of this model with later experimental results, is summarized.
|
2012.09664
|
Agustin Sabio Vera
|
N. Bethencourt de Le\'on, G. Chachamis, A. Sabio Vera
|
Multiperipheral final states in crowded twin-jet events at the LHC
|
22 pages, many figures. A new section relating the Chew-Pignotti
model and BFKL dynamics. We implement the collinear model in a Monte Carlo
code and study the jet radius dependence
| null |
10.1016/j.nuclphysb.2021.115518
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
The 13 TeV run of the LHC has provided a unique opportunity to explore
multi-jet final states with unprecedented accuracy. An interesting region for
study is that of events where one jet is tagged in the forward direction and
another one in the backward direction and a plethora of low energy mini-jets
populate the possibly large rapidity span in between them. Since the number of
these events is very high, it is possible to introduce stringent constraints on
the transverse momentum of the two leading jets which can be kept in small
windows not very different from each other, defining what we call "twin jets".
The associated "crowd" of mini-jets can also have a restricted span in
transverse momentum. The study of these events for a fixed multiplicity is an
ideal playground to investigate different models of multi-particle production
in hadron-hadron collisions. We set up an exploratory analysis by using an
ancient model of Chew and Pignotti to describe the gross features one can
expect for the structure of single and double differential-in-rapidity cross
sections and for particle-particle rapidity correlations when the longitudinal
phase space completely decouples from the transverse degrees of freedom.
|
[
{
"created": "Thu, 17 Dec 2020 15:28:10 GMT",
"version": "v1"
},
{
"created": "Wed, 10 Feb 2021 15:33:11 GMT",
"version": "v2"
},
{
"created": "Wed, 16 Jun 2021 13:59:16 GMT",
"version": "v3"
}
] |
2021-09-15
|
[
[
"de León",
"N. Bethencourt",
""
],
[
"Chachamis",
"G.",
""
],
[
"Vera",
"A. Sabio",
""
]
] |
The 13 TeV run of the LHC has provided a unique opportunity to explore multi-jet final states with unprecedented accuracy. An interesting region for study is that of events where one jet is tagged in the forward direction and another one in the backward direction and a plethora of low energy mini-jets populate the possibly large rapidity span in between them. Since the number of these events is very high, it is possible to introduce stringent constraints on the transverse momentum of the two leading jets which can be kept in small windows not very different from each other, defining what we call "twin jets". The associated "crowd" of mini-jets can also have a restricted span in transverse momentum. The study of these events for a fixed multiplicity is an ideal playground to investigate different models of multi-particle production in hadron-hadron collisions. We set up an exploratory analysis by using an ancient model of Chew and Pignotti to describe the gross features one can expect for the structure of single and double differential-in-rapidity cross sections and for particle-particle rapidity correlations when the longitudinal phase space completely decouples from the transverse degrees of freedom.
|
2209.11408
|
Wu-Long Xu
|
Wenyu Wang, Wu-Long Xu and Jin Min Yang
|
A hidden self-interacting dark matter sector with first order
cosmological phase transition and gravitational wave
|
20 pages, 4 figures. Accepted by EPJP
| null | null | null |
hep-ph
|
http://creativecommons.org/licenses/by/4.0/
|
A dark scalar mediator can easily realize the self-interacting dark matter
scenario and satisfy the constraint of the relic density of the dark matter.
When the hidden sector is highly decoupled from the visible sector, the
gravitational waves produced by the first order phase transition resulted from
this dark scalar mediator will be an important signature to probe the dark
sector physics. The simplest dark sector with one scalar and one Dirac fermion
is studied in this work. A generic quartic finite-temperature potential is used
to induce the strong first order phase transition. A joint analysis of the
self-interacting dark matter, the relic density of the dark matter and the
first order phase transition shows that the mass range of the dark scalar is
about $(4\times 10^{-4} \sim 3)~\rm GeV$. For the dark matter, when the
temperature ratio $\xi$ between the hidden sector and the visible sector is
larger than 0.1, its mass range is about $(10~ \rm MeV\sim 10~ \rm GeV)$. The
produced gravitational waves have a peak frequency of $(10^{-6}\sim 10^{-3})
~\rm Hz$ for a temperature ratio $0.1<\xi<1$, which may be detectable in future
measurements.
|
[
{
"created": "Fri, 23 Sep 2022 04:57:08 GMT",
"version": "v1"
},
{
"created": "Fri, 1 Sep 2023 02:09:20 GMT",
"version": "v2"
}
] |
2023-09-04
|
[
[
"Wang",
"Wenyu",
""
],
[
"Xu",
"Wu-Long",
""
],
[
"Yang",
"Jin Min",
""
]
] |
A dark scalar mediator can easily realize the self-interacting dark matter scenario and satisfy the constraint of the relic density of the dark matter. When the hidden sector is highly decoupled from the visible sector, the gravitational waves produced by the first order phase transition resulted from this dark scalar mediator will be an important signature to probe the dark sector physics. The simplest dark sector with one scalar and one Dirac fermion is studied in this work. A generic quartic finite-temperature potential is used to induce the strong first order phase transition. A joint analysis of the self-interacting dark matter, the relic density of the dark matter and the first order phase transition shows that the mass range of the dark scalar is about $(4\times 10^{-4} \sim 3)~\rm GeV$. For the dark matter, when the temperature ratio $\xi$ between the hidden sector and the visible sector is larger than 0.1, its mass range is about $(10~ \rm MeV\sim 10~ \rm GeV)$. The produced gravitational waves have a peak frequency of $(10^{-6}\sim 10^{-3}) ~\rm Hz$ for a temperature ratio $0.1<\xi<1$, which may be detectable in future measurements.
|
2203.01952
|
Javier Fuentes-Mart\'in
|
Javier Fuentes-Martin, Gino Isidori, Javier M. Lizana, Nudzeim
Selimovic, Ben A. Stefanek
|
Flavor hierarchies, flavor anomalies, and Higgs mass from a warped extra
dimension
|
7 pages, 1 figure
| null |
10.1016/j.physletb.2022.137382
|
ZU-TH-08/22
|
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
The recent B-meson anomalies are coherently explained at the TeV scale by
4321 gauge models with hierarchical couplings reminiscent of the Standard Model
Yukawas. We show that such models arise as the low-energy limit of a complete
theory of flavor, based on a warped fifth dimension where each Standard Model
family is quasi-localized in a different brane. The Higgs is identified as a
pseudo-Nambu-Goldstone boson emerging from the same dynamics responsible for
4321 symmetry breaking. This novel construction unifies quarks and leptons in a
flavor non-universal manner, provides a natural description of flavor
hierarchies, and addresses the electroweak hierarchy problem.
|
[
{
"created": "Thu, 3 Mar 2022 19:00:01 GMT",
"version": "v1"
}
] |
2022-08-31
|
[
[
"Fuentes-Martin",
"Javier",
""
],
[
"Isidori",
"Gino",
""
],
[
"Lizana",
"Javier M.",
""
],
[
"Selimovic",
"Nudzeim",
""
],
[
"Stefanek",
"Ben A.",
""
]
] |
The recent B-meson anomalies are coherently explained at the TeV scale by 4321 gauge models with hierarchical couplings reminiscent of the Standard Model Yukawas. We show that such models arise as the low-energy limit of a complete theory of flavor, based on a warped fifth dimension where each Standard Model family is quasi-localized in a different brane. The Higgs is identified as a pseudo-Nambu-Goldstone boson emerging from the same dynamics responsible for 4321 symmetry breaking. This novel construction unifies quarks and leptons in a flavor non-universal manner, provides a natural description of flavor hierarchies, and addresses the electroweak hierarchy problem.
|
0807.2480
|
Shevchenko O. Yu.
|
A. Sissakian, O. Shevchenko, A. Nagaytsev, O. Ivanov
|
Transversity and T-odd PDFs from Drell-Yan processes with $pp$, $pD$ and
$DD$ collisions
| null |
Eur.Phys.J.C59:659-673,2009
|
10.1140/epjc/s10052-008-0806-0
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We estimate the single-spin asymmetries (SSA) which provide the access to
transversity as well as to Boer-Mulders and Sivers PDFs via investigation of
the single-polarized Drell-Yan (DY) processes with $ pp$, $pD$ and $DD$
collisions available to RHIC, NICA, COMPASS, and J-PARC. The feasibility of
these SSA is studied with the new generator of polarized DY events. The
performed estimations demonstrate that there exist the such kinematical regions
where SSA are presumably measurable. The most useful for PDFs extraction are
the limiting kinematical ranges, where one can neglect the sea PDFs
contributions which occur at large values of Bjorken x. It is of interest that
on the contrary to the Sivers PDF, the transversity PDF is presumably
accessible only in the especial kinematical region. On the contrary to the
option with the symmetric collider mode (RHIC, NICA), this is of importance for
the COMPASS experiment and the future J-PARC facility where the fixed target
mode is available.
|
[
{
"created": "Tue, 15 Jul 2008 23:10:16 GMT",
"version": "v1"
},
{
"created": "Thu, 24 Jul 2008 11:05:01 GMT",
"version": "v2"
},
{
"created": "Fri, 29 Aug 2008 09:36:26 GMT",
"version": "v3"
},
{
"created": "Tue, 11 Nov 2008 13:47:32 GMT",
"version": "v4"
}
] |
2009-05-29
|
[
[
"Sissakian",
"A.",
""
],
[
"Shevchenko",
"O.",
""
],
[
"Nagaytsev",
"A.",
""
],
[
"Ivanov",
"O.",
""
]
] |
We estimate the single-spin asymmetries (SSA) which provide the access to transversity as well as to Boer-Mulders and Sivers PDFs via investigation of the single-polarized Drell-Yan (DY) processes with $ pp$, $pD$ and $DD$ collisions available to RHIC, NICA, COMPASS, and J-PARC. The feasibility of these SSA is studied with the new generator of polarized DY events. The performed estimations demonstrate that there exist the such kinematical regions where SSA are presumably measurable. The most useful for PDFs extraction are the limiting kinematical ranges, where one can neglect the sea PDFs contributions which occur at large values of Bjorken x. It is of interest that on the contrary to the Sivers PDF, the transversity PDF is presumably accessible only in the especial kinematical region. On the contrary to the option with the symmetric collider mode (RHIC, NICA), this is of importance for the COMPASS experiment and the future J-PARC facility where the fixed target mode is available.
|
1609.01024
|
Xin Liu
|
Xin Liu, Zhen-Jun Xiao, and Zhi-Tian Zou
|
Nonleptonic decays of $B \to ( f_1(1285),f_1(1420) ) V$ in the
perturbative QCD approach
|
33 pages, 1 figure, 17 tables, typos corrected, contents improved,
matching the journal version
|
Phys. Rev. D 94, 113005 (2016)
|
10.1103/PhysRevD.94.113005
|
JSNU-PHY-TH-2016
|
hep-ph hep-ex
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We investigate the branching ratios, the polarization fractions, the direct
CP-violating asymmetries, and the relative phases in 20 nonleptonic decay modes
of $B \to f_1 V$ within the framework of perturbative QCD approach at leading
order with $f_1$ including two $^3\!P_1$-axial-vector states $f_1(1285)$ and
$f_1(1420)$. Here, $B$ denotes $B^+$, $B^0$, and $B_s^0$ mesons and $V$ stands
for the lightest vector mesons $\rho$, $K^*$, $\omega$, and $\phi$ ,
respectively. The $B_s^0 \to f_1 V$ decays are studied theoretically for the
first time in the literature. Together with the angle $\phi_{f_1} \approx
(24^{+3.2}_{-2.7})^\circ$ extracted from the measurement through $B_{d/s} \to
J/\psi f_1(1285)$ modes for the $f_1(1285)-f_1(1420)$ mixing system, it is of
great interest to find phenomenologically some modes such as the tree-dominated
$B^+ \to f_1 \rho^+$ and the penguin-dominated $B^{+,0} \to f_1 K^{*+,0}, B_s^0
\to f_1 \phi$ with large branching ratios around ${\cal O}(10^{-6})$ or even
${\cal O}(10^{-5})$, which are expected measurable at the LHCb and/or the
Belle-II experiments in the near future. The good agreement [sharp contrast] of
branching ratios and decay pattern for $B^+ \to f_1 \rho^+, B^{+,0} \to
f_1(1285) K^{*+,0} [B^{+,0} \to f_1(1420) K^{*+,0}]$ decays between QCD
factorization and perturbative QCD factorization predictions can help us to
distinguish these two rather different factorization approaches via precision
measurements, which would also be helpful for us to explore the annihilation
decay mechanism through its important roles for the considered $B \to f_1 V$
decays.
|
[
{
"created": "Mon, 5 Sep 2016 03:37:05 GMT",
"version": "v1"
},
{
"created": "Tue, 6 Sep 2016 07:36:13 GMT",
"version": "v2"
},
{
"created": "Sat, 10 Dec 2016 14:53:23 GMT",
"version": "v3"
}
] |
2016-12-21
|
[
[
"Liu",
"Xin",
""
],
[
"Xiao",
"Zhen-Jun",
""
],
[
"Zou",
"Zhi-Tian",
""
]
] |
We investigate the branching ratios, the polarization fractions, the direct CP-violating asymmetries, and the relative phases in 20 nonleptonic decay modes of $B \to f_1 V$ within the framework of perturbative QCD approach at leading order with $f_1$ including two $^3\!P_1$-axial-vector states $f_1(1285)$ and $f_1(1420)$. Here, $B$ denotes $B^+$, $B^0$, and $B_s^0$ mesons and $V$ stands for the lightest vector mesons $\rho$, $K^*$, $\omega$, and $\phi$ , respectively. The $B_s^0 \to f_1 V$ decays are studied theoretically for the first time in the literature. Together with the angle $\phi_{f_1} \approx (24^{+3.2}_{-2.7})^\circ$ extracted from the measurement through $B_{d/s} \to J/\psi f_1(1285)$ modes for the $f_1(1285)-f_1(1420)$ mixing system, it is of great interest to find phenomenologically some modes such as the tree-dominated $B^+ \to f_1 \rho^+$ and the penguin-dominated $B^{+,0} \to f_1 K^{*+,0}, B_s^0 \to f_1 \phi$ with large branching ratios around ${\cal O}(10^{-6})$ or even ${\cal O}(10^{-5})$, which are expected measurable at the LHCb and/or the Belle-II experiments in the near future. The good agreement [sharp contrast] of branching ratios and decay pattern for $B^+ \to f_1 \rho^+, B^{+,0} \to f_1(1285) K^{*+,0} [B^{+,0} \to f_1(1420) K^{*+,0}]$ decays between QCD factorization and perturbative QCD factorization predictions can help us to distinguish these two rather different factorization approaches via precision measurements, which would also be helpful for us to explore the annihilation decay mechanism through its important roles for the considered $B \to f_1 V$ decays.
|
2007.08867
|
Timea Vitos
|
Rikkert Frederix, Timea Vitos
|
Electroweak corrections to the angular coefficients in finite-$p_T$
$Z$-boson production and dilepton decay
|
10 pages, 4 figures
| null |
10.1140/epjc/s10052-020-08513-7
|
LU-TP 20-42
|
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We present next-to-leading order (NLO) electroweak corrections to the
dominant five angular coefficients parametrizing the Drell-Yan process in the
$Z$-boson mass peak range for finite-$p_T$ vector boson production. The results
are presented differentially in the vector boson transverse momentum. The
Lam-Tung violating difference $A_0-A_2$ is examined alongside the coefficients.
A single lepton transverse momentum cut is needed in the case of electroweak
corrections to avoid a double singularity in the photon induced diagrams, and
the dependence on the value of this cut is examined. We compare the electroweak
corrections to the angular coefficients to the NLO QCD corrections, including
the single lepton cut. The size of the single lepton cut is found to affect the
two coefficients $A_0$ and $A_2$ to largest extent. The relative size of the
electroweak corrections to the coefficients is moderate for all single lepton
cut values, and by extrapolation to the inclusive results, is moderate also for
the full dilepton phase space case. However, for the Lam-Tung violation, there
is a significant contribution from the electroweak corrections for low $p_T$ of
the lepton pair.
|
[
{
"created": "Fri, 17 Jul 2020 09:49:46 GMT",
"version": "v1"
},
{
"created": "Tue, 13 Oct 2020 07:46:40 GMT",
"version": "v2"
}
] |
2020-10-14
|
[
[
"Frederix",
"Rikkert",
""
],
[
"Vitos",
"Timea",
""
]
] |
We present next-to-leading order (NLO) electroweak corrections to the dominant five angular coefficients parametrizing the Drell-Yan process in the $Z$-boson mass peak range for finite-$p_T$ vector boson production. The results are presented differentially in the vector boson transverse momentum. The Lam-Tung violating difference $A_0-A_2$ is examined alongside the coefficients. A single lepton transverse momentum cut is needed in the case of electroweak corrections to avoid a double singularity in the photon induced diagrams, and the dependence on the value of this cut is examined. We compare the electroweak corrections to the angular coefficients to the NLO QCD corrections, including the single lepton cut. The size of the single lepton cut is found to affect the two coefficients $A_0$ and $A_2$ to largest extent. The relative size of the electroweak corrections to the coefficients is moderate for all single lepton cut values, and by extrapolation to the inclusive results, is moderate also for the full dilepton phase space case. However, for the Lam-Tung violation, there is a significant contribution from the electroweak corrections for low $p_T$ of the lepton pair.
|
2309.06857
|
Ariel Arza
|
Ariel Arza, Quan Guo, Lei Wu, Qiaoli Yang, Xiaolong Yang, Qiang Yuan
and Bin Zhu
|
Listening for echo from the stimulated axion decay with the 21
CentiMeter Array
|
7 pages, 6 figures
| null | null | null |
hep-ph astro-ph.CO hep-ex
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
The axion is a hypothetical elementary particle that could solve the
long-standing strong CP problem in particle physics and the dark matter mystery
in the cosmos. Due to the stimulation of the ambient photons, the axion dark
matter decay into photons is significantly enhanced so that its echo signal
could be detected by terrestrial telescopes. As a pathfinder, we study the
expected sensitivity of searching for the axion dark matter in the mass range
between $0.41$ and $1.6\mu\text{eV}$ with the 21 CentiMeter Array (21CMA). We
aim to cover the whole 21CMA frequency range in two years by using a 1MW
emitter. We find that the resulting sensitivity on the axion-photon coupling
could surpass other existing limits by about one order of magnitude.
|
[
{
"created": "Wed, 13 Sep 2023 10:08:04 GMT",
"version": "v1"
},
{
"created": "Thu, 8 Aug 2024 10:57:39 GMT",
"version": "v2"
}
] |
2024-08-09
|
[
[
"Arza",
"Ariel",
""
],
[
"Guo",
"Quan",
""
],
[
"Wu",
"Lei",
""
],
[
"Yang",
"Qiaoli",
""
],
[
"Yang",
"Xiaolong",
""
],
[
"Yuan",
"Qiang",
""
],
[
"Zhu",
"Bin",
""
]
] |
The axion is a hypothetical elementary particle that could solve the long-standing strong CP problem in particle physics and the dark matter mystery in the cosmos. Due to the stimulation of the ambient photons, the axion dark matter decay into photons is significantly enhanced so that its echo signal could be detected by terrestrial telescopes. As a pathfinder, we study the expected sensitivity of searching for the axion dark matter in the mass range between $0.41$ and $1.6\mu\text{eV}$ with the 21 CentiMeter Array (21CMA). We aim to cover the whole 21CMA frequency range in two years by using a 1MW emitter. We find that the resulting sensitivity on the axion-photon coupling could surpass other existing limits by about one order of magnitude.
|
1011.2634
|
Amol Dighe
|
Ashutosh Kumar Alok, Amol Dighe and David London
|
Constraints on the Four-Generation Quark Mixing Matrix from a Fit to
Flavor-Physics Data
|
28 pages, LaTeX, no figures. Constraints from $A_b$ measurement
included, references added. Insignificant changes in fit results
|
Phys.Rev.D83:073008,2011
|
10.1103/PhysRevD.83.073008
|
UdeM-GPP-TH-10-188, TIFR/TH/10-32
|
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
In the scenario with four quark generations, we perform a fit using
flavor-physics data and determine the allowed values -- preferred central
values and errors -- of all of the elements of the 4X4 quark mixing matrix. In
addition to the direct measurements of some of the elements, we include in the
fit the present measurements of several flavor-changing observables in the K
and B systems that have small hadronic uncertainties, and also consider the
constraints from the vertex corrections to Z -> b bbar. The values taken for
the masses of the fourth-generation quarks are consistent with the measurements
of the oblique parameters and perturbativity of the Yukawa couplings. We find
that |{\tilde V}_{tb}| >= 0.98 at 3sigma, so that a fourth generation cannot
account for any large deviation of |{\tilde V}_{tb}| from unity. The fit also
indicates that all the new-physics parameters are consistent with zero, and the
mixing of the fourth generation with the other three is constrained to be very
small: we obtain |{\tilde V}_{ub'}| < 0.06, |{\tilde V}_{cb'}| < 0.027, and
|{\tilde V}_{tb'}| < 0.31 at 3sigma. Still, this does allow for the possibility
of new-physics signals in Bd, Bs and rare K decays.
|
[
{
"created": "Thu, 11 Nov 2010 12:37:58 GMT",
"version": "v1"
},
{
"created": "Mon, 28 Feb 2011 14:23:16 GMT",
"version": "v2"
}
] |
2011-05-12
|
[
[
"Alok",
"Ashutosh Kumar",
""
],
[
"Dighe",
"Amol",
""
],
[
"London",
"David",
""
]
] |
In the scenario with four quark generations, we perform a fit using flavor-physics data and determine the allowed values -- preferred central values and errors -- of all of the elements of the 4X4 quark mixing matrix. In addition to the direct measurements of some of the elements, we include in the fit the present measurements of several flavor-changing observables in the K and B systems that have small hadronic uncertainties, and also consider the constraints from the vertex corrections to Z -> b bbar. The values taken for the masses of the fourth-generation quarks are consistent with the measurements of the oblique parameters and perturbativity of the Yukawa couplings. We find that |{\tilde V}_{tb}| >= 0.98 at 3sigma, so that a fourth generation cannot account for any large deviation of |{\tilde V}_{tb}| from unity. The fit also indicates that all the new-physics parameters are consistent with zero, and the mixing of the fourth generation with the other three is constrained to be very small: we obtain |{\tilde V}_{ub'}| < 0.06, |{\tilde V}_{cb'}| < 0.027, and |{\tilde V}_{tb'}| < 0.31 at 3sigma. Still, this does allow for the possibility of new-physics signals in Bd, Bs and rare K decays.
|
hep-ph/0601104
|
Zhi-Zhong Xing
|
Harald Fritzsch and Zhi-zhong Xing
|
Lepton Mass Hierarchy and Neutrino Mixing
|
RevTex 10 pages, 2 figures
|
Phys.Lett. B634 (2006) 514-519
|
10.1016/j.physletb.2006.02.028
| null |
hep-ph
| null |
We speculate that the mass spectrum of three neutrinos might have a normal
hierarchy as that of three charged leptons or that of three up-type (or
down-type) quarks. In this spirit, we propose a novel parametrization of the
$3\times 3$ lepton flavor mixing matrix. Its mixing angles $\theta_l$ and
$\theta_\nu$ can be related to the mass ratios $m_e/m_\mu$ and $m_1/m_2$ in a
specific texture of lepton mass matrices with vanishing (1,1) elements:
$\tan\theta_l = \sqrt{m_e/m_\mu}$ and $\tan\theta_\nu = \sqrt{m_1/m_2}$. The
latter relation, together with solar and atmospheric neutrino oscillation data,
predicts 0.0030 eV $\lesssim m_1 \lesssim$ 0.0073 eV, 0.009 eV $\lesssim m_2
\lesssim $ 0.012 eV and 0.042 eV $\lesssim m_3 \lesssim$ 0.058 eV. The smallest
neutrino mixing angle is found to be $\theta_{13} \approx \theta_l/\sqrt{2}
\approx 3^\circ$, which is experimentally accessible in the near future.
|
[
{
"created": "Fri, 13 Jan 2006 02:00:55 GMT",
"version": "v1"
}
] |
2009-11-11
|
[
[
"Fritzsch",
"Harald",
""
],
[
"Xing",
"Zhi-zhong",
""
]
] |
We speculate that the mass spectrum of three neutrinos might have a normal hierarchy as that of three charged leptons or that of three up-type (or down-type) quarks. In this spirit, we propose a novel parametrization of the $3\times 3$ lepton flavor mixing matrix. Its mixing angles $\theta_l$ and $\theta_\nu$ can be related to the mass ratios $m_e/m_\mu$ and $m_1/m_2$ in a specific texture of lepton mass matrices with vanishing (1,1) elements: $\tan\theta_l = \sqrt{m_e/m_\mu}$ and $\tan\theta_\nu = \sqrt{m_1/m_2}$. The latter relation, together with solar and atmospheric neutrino oscillation data, predicts 0.0030 eV $\lesssim m_1 \lesssim$ 0.0073 eV, 0.009 eV $\lesssim m_2 \lesssim $ 0.012 eV and 0.042 eV $\lesssim m_3 \lesssim$ 0.058 eV. The smallest neutrino mixing angle is found to be $\theta_{13} \approx \theta_l/\sqrt{2} \approx 3^\circ$, which is experimentally accessible in the near future.
|
1109.5140
|
Akin Wingerter
|
Akin Wingerter
|
Implications of the Stability and Triviality Bounds on the Standard
Model with Three and Four Chiral Generations
| null | null |
10.1103/PhysRevD.84.095012
|
LPSC-10210
|
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We revisit the stability and triviality bounds on the Higgs boson mass in the
context of the Standard Model with three and four generations (SM3 and SM4,
respectively). In light of the recent results from LHC the triviality bound in
the SM3 has now become obsolete, and the stability bound implies for a Higgs
mass of e.g. mH=115 GeV the onset of new physics before 650 TeV, whereas there
are no limits for mH>133 GeV. For the SM4, the stability and triviality curves
intersect and bound a finite region. As a consequence, the fourth generation
fermions place stringent theoretical limits on the Higgs mass, and there is a
maximal scale beyond which the theory cannot be perturbatively valid. We find
that the Higgs mass cannot exceed 700 GeV for any values of the fourth
generation fermion masses. Turning the argument around, the absence of a Higgs
signal for mH<600 GeV excludes a fourth generation with quark masses below 300
GeV and lepton masses below 350 GeV. In particular, the quark bounds also hold
for the small mixing scenarios for which the direct limits from Tevatron and
LHC are not applicable, and the lepton bounds we obtain are stronger than the
collider limits. If a Higgs boson lighter than 700 GeV is not observed, a
fourth generation of chiral fermions with perturbative Yukawa couplings will be
conclusively excluded for the full range of parameters.
|
[
{
"created": "Fri, 23 Sep 2011 17:41:11 GMT",
"version": "v1"
}
] |
2013-05-29
|
[
[
"Wingerter",
"Akin",
""
]
] |
We revisit the stability and triviality bounds on the Higgs boson mass in the context of the Standard Model with three and four generations (SM3 and SM4, respectively). In light of the recent results from LHC the triviality bound in the SM3 has now become obsolete, and the stability bound implies for a Higgs mass of e.g. mH=115 GeV the onset of new physics before 650 TeV, whereas there are no limits for mH>133 GeV. For the SM4, the stability and triviality curves intersect and bound a finite region. As a consequence, the fourth generation fermions place stringent theoretical limits on the Higgs mass, and there is a maximal scale beyond which the theory cannot be perturbatively valid. We find that the Higgs mass cannot exceed 700 GeV for any values of the fourth generation fermion masses. Turning the argument around, the absence of a Higgs signal for mH<600 GeV excludes a fourth generation with quark masses below 300 GeV and lepton masses below 350 GeV. In particular, the quark bounds also hold for the small mixing scenarios for which the direct limits from Tevatron and LHC are not applicable, and the lepton bounds we obtain are stronger than the collider limits. If a Higgs boson lighter than 700 GeV is not observed, a fourth generation of chiral fermions with perturbative Yukawa couplings will be conclusively excluded for the full range of parameters.
|
1908.07457
|
Hiroshi Okada
|
Takaaki Nomura, Hiroshi Okada, Oleg Popov
|
A modular $A_4$ symmetric scotogenic model
|
14 pages, 5 figures, 2 tables; version accepted for publication in
Physics Letters B. arXiv admin note: text overlap with arXiv:1907.04716
| null |
10.1016/j.physletb.2020.135294
|
KIAS-P19048, APCTP Pre2019 - 022
|
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We propose a minimal extention of the Standard Model where neutrino masses
are generated radiatively at one-loop level via Scotogenic scanario. The model
is augmented with $A_4$ modular symmetry as a scotogenic and flavor symmetry.
With minimal number of parameters, the model makes predictions for neutrino
oscillation data, Majorana and Dirac phases, dark matter characteristics, and
neutrinoless double beta decay.
|
[
{
"created": "Mon, 19 Aug 2019 07:46:48 GMT",
"version": "v1"
},
{
"created": "Thu, 12 Mar 2020 13:49:46 GMT",
"version": "v2"
}
] |
2020-03-16
|
[
[
"Nomura",
"Takaaki",
""
],
[
"Okada",
"Hiroshi",
""
],
[
"Popov",
"Oleg",
""
]
] |
We propose a minimal extention of the Standard Model where neutrino masses are generated radiatively at one-loop level via Scotogenic scanario. The model is augmented with $A_4$ modular symmetry as a scotogenic and flavor symmetry. With minimal number of parameters, the model makes predictions for neutrino oscillation data, Majorana and Dirac phases, dark matter characteristics, and neutrinoless double beta decay.
|
1907.05747
|
Rafael Pav\~ao
|
Juan Nieves and Rafael Pavao
|
On the nature of the lowest-lying odd parity charmed baryon
$\Lambda_c(2595)$ and $\Lambda_c(2625)$ resonances
|
16 pages, 7 figures
|
Phys. Rev. D 101, 014018 (2020)
|
10.1103/PhysRevD.101.014018
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We study the structure of the $\Lambda_c(2595)$ and $\Lambda_c(2625)$
resonances in the framework of an effective field theory consistent with heavy
quark spin and chiral symmetries, that incorporates the interplay between
$\Sigma_c^{(*)}\pi-ND^{(*)}$ baryon-meson degrees of freedom and bare P-wave
$c\bar ud$ quark-model states. We show that these two resonances are not HQSS
partners. The $J^P= 3/2^-$ $\Lambda_c(2625)$ should be viewed mostly as a
dressed three quark state, whose origin is determined by a bare state,
predicted to lie very close to the mass of the resonance. The $J^P= 1/2^-$
$\Lambda_c(2595)$ seems to have, however, a predominant molecular structure.
This is because, it is either the result of the chiral $\Sigma_c\pi$
interaction, which threshold is located much more closer than the mass of the
bare three-quark state, or because the light degrees of freedom in its inner
structure are coupled to the unnatural $0^-$ quantum-numbers. We show that both
situations can occur depending on the renormalization procedure used. We find
some additional states, but the classification of the spectrum in terms of HQSS
is difficult, despite having used interactions that respect this symmetry. This
is because the bare quark-model state and the $\Sigma_c\pi$ threshold are
located extraordinarily close to the $\Lambda_c(2625)$ and $\Lambda_c(2595)$,
respectively, and hence they play totally different roles in each sector.
|
[
{
"created": "Fri, 12 Jul 2019 13:55:13 GMT",
"version": "v1"
}
] |
2020-01-29
|
[
[
"Nieves",
"Juan",
""
],
[
"Pavao",
"Rafael",
""
]
] |
We study the structure of the $\Lambda_c(2595)$ and $\Lambda_c(2625)$ resonances in the framework of an effective field theory consistent with heavy quark spin and chiral symmetries, that incorporates the interplay between $\Sigma_c^{(*)}\pi-ND^{(*)}$ baryon-meson degrees of freedom and bare P-wave $c\bar ud$ quark-model states. We show that these two resonances are not HQSS partners. The $J^P= 3/2^-$ $\Lambda_c(2625)$ should be viewed mostly as a dressed three quark state, whose origin is determined by a bare state, predicted to lie very close to the mass of the resonance. The $J^P= 1/2^-$ $\Lambda_c(2595)$ seems to have, however, a predominant molecular structure. This is because, it is either the result of the chiral $\Sigma_c\pi$ interaction, which threshold is located much more closer than the mass of the bare three-quark state, or because the light degrees of freedom in its inner structure are coupled to the unnatural $0^-$ quantum-numbers. We show that both situations can occur depending on the renormalization procedure used. We find some additional states, but the classification of the spectrum in terms of HQSS is difficult, despite having used interactions that respect this symmetry. This is because the bare quark-model state and the $\Sigma_c\pi$ threshold are located extraordinarily close to the $\Lambda_c(2625)$ and $\Lambda_c(2595)$, respectively, and hence they play totally different roles in each sector.
|
1407.5054
|
Francois Arleo
|
Fran\c{c}ois Arleo, St\'ephane Peign\'e
|
Quarkonium suppression in heavy-ion collisions from coherent energy loss
in cold nuclear matter
|
20 pages, 9 figures
| null |
10.1007/JHEP10(2014)073
|
LAPTH-050/14
|
hep-ph hep-ex nucl-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
The effect of parton energy loss in cold nuclear matter on the suppression of
quarkonia (J/psi, Upsilon) in heavy-ion collisions is investigated, by
extrapolating a model based on coherent radiative energy loss recently shown to
describe successfully J/psi and Upsilon suppression in proton-nucleus
collisions. Model predictions in heavy-ion collisions at RHIC (Au-Au, Cu-Cu,
and Cu-Au) and LHC (Pb-Pb) show a sizable suppression arising from the sole
effect of energy loss in cold matter. This effect should thus be considered in
order to get a reliable baseline for cold nuclear matter effects in quarkonium
suppression in heavy-ion collisions, in view of disentangling hot from cold
nuclear effects.
|
[
{
"created": "Fri, 18 Jul 2014 16:21:27 GMT",
"version": "v1"
}
] |
2015-06-22
|
[
[
"Arleo",
"François",
""
],
[
"Peigné",
"Stéphane",
""
]
] |
The effect of parton energy loss in cold nuclear matter on the suppression of quarkonia (J/psi, Upsilon) in heavy-ion collisions is investigated, by extrapolating a model based on coherent radiative energy loss recently shown to describe successfully J/psi and Upsilon suppression in proton-nucleus collisions. Model predictions in heavy-ion collisions at RHIC (Au-Au, Cu-Cu, and Cu-Au) and LHC (Pb-Pb) show a sizable suppression arising from the sole effect of energy loss in cold matter. This effect should thus be considered in order to get a reliable baseline for cold nuclear matter effects in quarkonium suppression in heavy-ion collisions, in view of disentangling hot from cold nuclear effects.
|
2109.06244
|
Maria Manuela Saez
|
M.M.Saez, M.E.Mosquera, O.Civitarese
|
Neutrino interactions in liquid scintillators including active-sterile
neutrino mixing
|
20 pages, 11 figures, 74 references
| null |
10.1142/S0218301322500239
| null |
hep-ph nucl-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Neutrinos play an important role in core-collapse supernova events since they
are a key piece to understand the explosion mechanisms. The analysis of the
neutrino fluxes can bring answers to neutrino's related problems e.g.: mass
hierarchy, spectral splitting, sterile neutrinos, etc. In this work we study
the impact of neutrino oscillations and the possible existence of eV sterile
neutrinos upon the supernova neutrino flux $F_\nu(E)$. We have calculated the
energy distribution of the neutrino flux from a supernova and the total number
of events which would be detected in a liquid scintillator. We also present an
analysis for the conversion probabilities as a function of the active-sterile
neutrino mixing parameters. Finally, we have carried out a statistical analysis
to extract values for the mixing parameters of the model.
|
[
{
"created": "Mon, 13 Sep 2021 18:19:47 GMT",
"version": "v1"
},
{
"created": "Fri, 4 Feb 2022 15:05:32 GMT",
"version": "v2"
}
] |
2022-05-11
|
[
[
"Saez",
"M. M.",
""
],
[
"Mosquera",
"M. E.",
""
],
[
"Civitarese",
"O.",
""
]
] |
Neutrinos play an important role in core-collapse supernova events since they are a key piece to understand the explosion mechanisms. The analysis of the neutrino fluxes can bring answers to neutrino's related problems e.g.: mass hierarchy, spectral splitting, sterile neutrinos, etc. In this work we study the impact of neutrino oscillations and the possible existence of eV sterile neutrinos upon the supernova neutrino flux $F_\nu(E)$. We have calculated the energy distribution of the neutrino flux from a supernova and the total number of events which would be detected in a liquid scintillator. We also present an analysis for the conversion probabilities as a function of the active-sterile neutrino mixing parameters. Finally, we have carried out a statistical analysis to extract values for the mixing parameters of the model.
|
hep-ph/0508289
|
Kacper Zalewski
|
A. Bialas, W Czyz and K. Zalewski
|
Moments of the particle phase-space density at freeze-out and
coincidence probabilities
|
Latex, six pages, no figures
|
Acta Phys.Polon. B36 (2005) 3109-3114
| null | null |
hep-ph
| null |
It is pointed out that the moments of phase-space particle density at
freeze-out can be determined from the coincidence probabilities of the events
observed in multiparticle production. A method to measure the coincidence
probabilities is described and its validity examined.
|
[
{
"created": "Mon, 29 Aug 2005 09:53:50 GMT",
"version": "v1"
}
] |
2007-05-23
|
[
[
"Bialas",
"A.",
""
],
[
"Czyz",
"W",
""
],
[
"Zalewski",
"K.",
""
]
] |
It is pointed out that the moments of phase-space particle density at freeze-out can be determined from the coincidence probabilities of the events observed in multiparticle production. A method to measure the coincidence probabilities is described and its validity examined.
|
hep-ph/9603328
|
Apostolos Pilaftsis
|
Apostolos Pilaftsis
|
Resonant CP-Violating Scalar--Pseudoscalar Transitions at mu+ mu-
Colliders
|
10 pages, LaTeX (2 figs included), title changed to underline the
resonant CP-violating effect. Journ.-ref: Phys. Rev. Lett. 77 (1996) 4996
|
Phys.Rev.Lett. 77 (1996) 4996-4999
|
10.1103/PhysRevLett.77.4996
| null |
hep-ph
| null |
A mu+ mu- collider is an appealing machine to probe resonant CP-violating
transitions of a CP-even Higgs particle into the Z boson or into another CP-odd
Higgs scalar. These phenomena are studied within a manifestly gauge-invariant
approach implemented by the pinch technique. The CP invariance of an extended
Higgs sector motivated by supersymmetric E_6 models is assumed to be broken
radiatively by the presence of heavy Majorana fermions. CP violation
originating from Higgs-Z mixing is found to be very modest, whereas CP-number
violating transitions involving Higgs scalars only can be resonantly enhanced
up to order of unity.
|
[
{
"created": "Sun, 17 Mar 1996 17:05:54 GMT",
"version": "v1"
},
{
"created": "Wed, 4 Dec 1996 20:12:33 GMT",
"version": "v2"
}
] |
2009-10-28
|
[
[
"Pilaftsis",
"Apostolos",
""
]
] |
A mu+ mu- collider is an appealing machine to probe resonant CP-violating transitions of a CP-even Higgs particle into the Z boson or into another CP-odd Higgs scalar. These phenomena are studied within a manifestly gauge-invariant approach implemented by the pinch technique. The CP invariance of an extended Higgs sector motivated by supersymmetric E_6 models is assumed to be broken radiatively by the presence of heavy Majorana fermions. CP violation originating from Higgs-Z mixing is found to be very modest, whereas CP-number violating transitions involving Higgs scalars only can be resonantly enhanced up to order of unity.
|
hep-ph/9906496
|
Marco Peloso
|
M. Peloso (SISSA, Trieste)
|
Leptogenesis via preheating
|
Talk given at Valencia'99, to appear on Nuclear Physics B, Proc.
Suppl. (5 pages + 2 figures included with epsfig); espcrc2.sty needed
|
Nucl.Phys.Proc.Suppl. 81 (2000) 81-85
|
10.1016/S0920-5632(99)00862-2
| null |
hep-ph astro-ph
| null |
Leptogenesis constitues a very simple scenario to achieve the baryon
asymmetry that we observe today. It requires only the presence of right handed
neutrinos (which arise very naturally in many extensions of the Standard Model)
and depends crucially on the mechanism responsible for their production. In
particular, when their mass exceeds the inflaton mass (10^13 GeV in chaotic
inflation) only non perturbative production can occur. It is shown here that
non perturbative production of fermions in an expanding Universe is a very
efficient mechanism up to masses of order of (10^17 - 10^18) GeV, and that it
can be easily applied to solve the baryon asymmetry problem.
|
[
{
"created": "Fri, 25 Jun 1999 10:00:52 GMT",
"version": "v1"
}
] |
2009-10-31
|
[
[
"Peloso",
"M.",
"",
"SISSA, Trieste"
]
] |
Leptogenesis constitues a very simple scenario to achieve the baryon asymmetry that we observe today. It requires only the presence of right handed neutrinos (which arise very naturally in many extensions of the Standard Model) and depends crucially on the mechanism responsible for their production. In particular, when their mass exceeds the inflaton mass (10^13 GeV in chaotic inflation) only non perturbative production can occur. It is shown here that non perturbative production of fermions in an expanding Universe is a very efficient mechanism up to masses of order of (10^17 - 10^18) GeV, and that it can be easily applied to solve the baryon asymmetry problem.
|
2110.05487
|
Raymond Co
|
Raymond T. Co, Keisuke Harigaya, Zachary Johnson, and Aaron Pierce
|
R-Parity Violation Axiogenesis
|
40 pages + references, 5 figures
| null |
10.1007/JHEP11(2021)210
|
UMN-TH-4104/21, FTPI-MINN-21-21, CERN-TH-2021-147, LCTP-21-25
|
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We show that the rotation of the QCD axion field, aided by $B-L$ violation
from supersymmetric $R$-parity violating couplings, can yield the observed
baryon abundance. Strong sphaleron processes transfer the angular momentum of
the axion field into a quark chiral asymmetry, which $R$-parity violating
couplings convert to the baryon asymmetry of the Universe. We focus on the case
of dimensionless $R$-parity violating couplings with textures motivated by
grand unified theories and comment on more general scenarios. The axion decay
constant and mass spectrum of supersymmetric particles are constrained by Big
Bang nucleosynthesis, proton decay from the $R$-parity violation, and
successful thermalization of the Peccei-Quinn symmetry breaking field. Axion
dark matter may be produced by the axion rotation via the kinetic misalignment
mechanism for axion decay constants below $10^{10}$ GeV, or by the conventional
misalignment mechanism for $10^{11-12}$ GeV. The viable parameter region can be
probed by proton decay and axion searches. This scenario may also have
connections with collider experiments, including searches for long-lived
particles, and observations of gravitational waves.
|
[
{
"created": "Mon, 11 Oct 2021 18:00:00 GMT",
"version": "v1"
}
] |
2021-12-22
|
[
[
"Co",
"Raymond T.",
""
],
[
"Harigaya",
"Keisuke",
""
],
[
"Johnson",
"Zachary",
""
],
[
"Pierce",
"Aaron",
""
]
] |
We show that the rotation of the QCD axion field, aided by $B-L$ violation from supersymmetric $R$-parity violating couplings, can yield the observed baryon abundance. Strong sphaleron processes transfer the angular momentum of the axion field into a quark chiral asymmetry, which $R$-parity violating couplings convert to the baryon asymmetry of the Universe. We focus on the case of dimensionless $R$-parity violating couplings with textures motivated by grand unified theories and comment on more general scenarios. The axion decay constant and mass spectrum of supersymmetric particles are constrained by Big Bang nucleosynthesis, proton decay from the $R$-parity violation, and successful thermalization of the Peccei-Quinn symmetry breaking field. Axion dark matter may be produced by the axion rotation via the kinetic misalignment mechanism for axion decay constants below $10^{10}$ GeV, or by the conventional misalignment mechanism for $10^{11-12}$ GeV. The viable parameter region can be probed by proton decay and axion searches. This scenario may also have connections with collider experiments, including searches for long-lived particles, and observations of gravitational waves.
|
0807.4319
|
Gouranga Nayak
|
Gouranga C Nayak (UI, Chicago)
|
Schwinger Mechanism for Gluon Pair Production in the Presence of
Arbitrary Time Dependent Chromo-Electric Field in Arbitrary Gauge
|
8 pages latex, Int. J. Mod. Phys. A (accepted)
|
Int.J.Mod.Phys.A25:1155-1163,2010
|
10.1142/S0217751X10047865
| null |
hep-ph hep-th nucl-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We study non-perturbative gluon pair production from arbitrary time dependent
chromo-electric field E^a(t) with arbitrary color index a =1,2,...8 via
Schwinger mechanism in arbitrary covariant background gauge \alpha. We show
that the probability of non-perturbative gluon pair production per unit time
per unit volume per unit transverse momentum \frac{dW}{d^4xd^2p_T} is
independent of gauge fixing parameter \alpha. Hence the result obtained in the
Fynman-'t Hooft gauge, \alpha=1, is the correct gauge invariant and gauge
parameter \alpha independent result.
|
[
{
"created": "Mon, 28 Jul 2008 18:53:54 GMT",
"version": "v1"
},
{
"created": "Fri, 2 Oct 2009 08:01:18 GMT",
"version": "v2"
}
] |
2010-03-23
|
[
[
"Nayak",
"Gouranga C",
"",
"UI, Chicago"
]
] |
We study non-perturbative gluon pair production from arbitrary time dependent chromo-electric field E^a(t) with arbitrary color index a =1,2,...8 via Schwinger mechanism in arbitrary covariant background gauge \alpha. We show that the probability of non-perturbative gluon pair production per unit time per unit volume per unit transverse momentum \frac{dW}{d^4xd^2p_T} is independent of gauge fixing parameter \alpha. Hence the result obtained in the Fynman-'t Hooft gauge, \alpha=1, is the correct gauge invariant and gauge parameter \alpha independent result.
|
1104.0218
|
Vicente Vento
|
Luis N. Epele, Huner Fanchiotti, Carlos A. Garcia Canal, Vasiliki A.
Mitsou and Vicente Vento
|
Looking for magnetic monopoles at LHC
|
15 pages and 14 figures
| null | null |
FTUV-11-2702,IFIC/11-14
|
hep-ph hep-ex
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Magnetic monopoles have been a subject of interest since Dirac established
the relation between the existence of monopoles and charge quantization. The
intense experimental search carried thus far has not met with success. We study
the observability of monopoles at the Large Hadron collider in the
photon-photon channel and show that LHC is an ideal machine to discover
monopoles with masses below 1 TeV at present running energies and with less
than 1 fb^{-1} of integrated luminosity.
|
[
{
"created": "Fri, 1 Apr 2011 16:34:38 GMT",
"version": "v1"
},
{
"created": "Mon, 11 Apr 2011 13:47:56 GMT",
"version": "v2"
}
] |
2015-03-19
|
[
[
"Epele",
"Luis N.",
""
],
[
"Fanchiotti",
"Huner",
""
],
[
"Canal",
"Carlos A. Garcia",
""
],
[
"Mitsou",
"Vasiliki A.",
""
],
[
"Vento",
"Vicente",
""
]
] |
Magnetic monopoles have been a subject of interest since Dirac established the relation between the existence of monopoles and charge quantization. The intense experimental search carried thus far has not met with success. We study the observability of monopoles at the Large Hadron collider in the photon-photon channel and show that LHC is an ideal machine to discover monopoles with masses below 1 TeV at present running energies and with less than 1 fb^{-1} of integrated luminosity.
|
hep-ph/0412164
|
Tord Riemann
|
M. Czakon, J. Gluza, T. Riemann
|
Master integrals for massive two-loop Bhabha scattering in QED
|
23 pages, 5 tables, 12 figures, references added, appendix B enlarged
|
Phys.Rev. D71 (2005) 073009
|
10.1103/PhysRevD.71.073009
|
DESY 04-222, SFB-CPP-04-61
|
hep-ph
| null |
We present a set of scalar master integrals (MIs) needed for a complete
treatment of massive two-loop corrections to Bhabha scattering in QED,
including integrals with arbitrary fermionic loops. The status of analytical
solutions for the MIs is reviewed and examples of some methods to solve MIs
analytically are worked out in more detail. Analytical results for the pole
terms in epsilon of so far unknown box MIs with five internal lines are given.
|
[
{
"created": "Mon, 13 Dec 2004 17:57:24 GMT",
"version": "v1"
},
{
"created": "Fri, 7 Jan 2005 15:56:08 GMT",
"version": "v2"
}
] |
2009-11-10
|
[
[
"Czakon",
"M.",
""
],
[
"Gluza",
"J.",
""
],
[
"Riemann",
"T.",
""
]
] |
We present a set of scalar master integrals (MIs) needed for a complete treatment of massive two-loop corrections to Bhabha scattering in QED, including integrals with arbitrary fermionic loops. The status of analytical solutions for the MIs is reviewed and examples of some methods to solve MIs analytically are worked out in more detail. Analytical results for the pole terms in epsilon of so far unknown box MIs with five internal lines are given.
|
1212.0761
|
Asmita Mukherjee
|
A. Harindranath, Rajen Kundu, Asmita Mukherjee, Raghunath Ratabole
|
Comment on Phys. Rev. Lett. 109, 152005 (2012)
|
Revised Version, 1 page
|
Phys. Rev. Lett. Vol 111,039102 (2013)
| null | null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
The identifications of transverse boost and rotation operators in light front
theory done in Phys. Rev. Lett. {109}, 152005 (2012) is incorrect. The simple
parton interpretation claimed is, in fact, for the transverse boost operator.
Manifestation of Lorentz symmetry as claimed in the context of their
calculation involving transverse Pauli-Lubanski polarization vector is
unsupported.
|
[
{
"created": "Tue, 4 Dec 2012 15:24:25 GMT",
"version": "v1"
},
{
"created": "Thu, 11 Apr 2013 13:19:26 GMT",
"version": "v2"
}
] |
2013-07-30
|
[
[
"Harindranath",
"A.",
""
],
[
"Kundu",
"Rajen",
""
],
[
"Mukherjee",
"Asmita",
""
],
[
"Ratabole",
"Raghunath",
""
]
] |
The identifications of transverse boost and rotation operators in light front theory done in Phys. Rev. Lett. {109}, 152005 (2012) is incorrect. The simple parton interpretation claimed is, in fact, for the transverse boost operator. Manifestation of Lorentz symmetry as claimed in the context of their calculation involving transverse Pauli-Lubanski polarization vector is unsupported.
|
hep-ph/0303187
|
Yuval Grossman
|
Anjan Giri, Yuval Grossman, Abner Soffer, Jure Zupan
|
Determining $\gamma$ using $B^\pm \to D K^\pm$ with multibody D decays
|
17 pages, 1 figure
|
Phys.Rev. D68 (2003) 054018
|
10.1103/PhysRevD.68.054018
| null |
hep-ph
| null |
We propose a method for determining $\gamma$ using $B^\pm\to D K^\pm$ decays
followed by a multibody $D$ decay, such as $D \to K_S \pi^-\pi^+$, $D \to K_S
K^-K^+$ and $D \to K_S \pi^-\pi^+\pi^0$. The main advantages of the method is
that it uses only Cabibbo allowed $D$ decays, and that large strong phases are
expected due to the presence of resonances. Since no knowledge about the
resonance structure is needed, $\gamma$ can be extracted without any hadronic
uncertainty.
|
[
{
"created": "Fri, 21 Mar 2003 19:26:36 GMT",
"version": "v1"
}
] |
2009-11-10
|
[
[
"Giri",
"Anjan",
""
],
[
"Grossman",
"Yuval",
""
],
[
"Soffer",
"Abner",
""
],
[
"Zupan",
"Jure",
""
]
] |
We propose a method for determining $\gamma$ using $B^\pm\to D K^\pm$ decays followed by a multibody $D$ decay, such as $D \to K_S \pi^-\pi^+$, $D \to K_S K^-K^+$ and $D \to K_S \pi^-\pi^+\pi^0$. The main advantages of the method is that it uses only Cabibbo allowed $D$ decays, and that large strong phases are expected due to the presence of resonances. Since no knowledge about the resonance structure is needed, $\gamma$ can be extracted without any hadronic uncertainty.
|
0707.0187
|
Shao-Long Chen
|
Shao-Long Chen, Xiao-Gang He, Ho-Chin Tsai
|
Constraints on Unparticle Interactions from Invisible Decays of Z,
Quarkonia and Neutrinos
|
12 pages, 4 figures, version to appear in JHEP;
|
JHEP 0711:010,2007
|
10.1088/1126-6708/2007/11/010
| null |
hep-ph hep-ex
| null |
Unparticles ($\U$) interact weakly with particles. The direct signature of
unparticles will be in the form of missing energy. We study constraints on
unparticle interactions using totally invisible decay modes of $Z$, vector
quarkonia $V$ and neutrinos. The constraints on the unparticle interaction
scale $\Lambda_\U$ are very sensitive to the dimension $d_\U$ of the
unparticles. From invisible $Z$ and $V$ decays, we find that with $d_\U$ close
to 1 for vector $\U$, the unparticle scale $\Lambda_\U$ can be more than $10^4$
TeV, and for $d_\U$ around 2, the scale can be lower than one TeV. From
invisible neutrino decays, we find that if $d_\U$ is close to 3/2, the scale
can be more than the Planck mass, but with $d_\U$ around 2 the scale can be as
low as a few hundred GeV. We also study the possibility of using $V (Z)\to
\gamma + \U$ to constrain unparticle interactions, and find that present data
give weak constraints.
|
[
{
"created": "Mon, 2 Jul 2007 10:13:54 GMT",
"version": "v1"
},
{
"created": "Sun, 15 Jul 2007 06:47:15 GMT",
"version": "v2"
},
{
"created": "Mon, 29 Oct 2007 13:32:37 GMT",
"version": "v3"
}
] |
2009-01-06
|
[
[
"Chen",
"Shao-Long",
""
],
[
"He",
"Xiao-Gang",
""
],
[
"Tsai",
"Ho-Chin",
""
]
] |
Unparticles ($\U$) interact weakly with particles. The direct signature of unparticles will be in the form of missing energy. We study constraints on unparticle interactions using totally invisible decay modes of $Z$, vector quarkonia $V$ and neutrinos. The constraints on the unparticle interaction scale $\Lambda_\U$ are very sensitive to the dimension $d_\U$ of the unparticles. From invisible $Z$ and $V$ decays, we find that with $d_\U$ close to 1 for vector $\U$, the unparticle scale $\Lambda_\U$ can be more than $10^4$ TeV, and for $d_\U$ around 2, the scale can be lower than one TeV. From invisible neutrino decays, we find that if $d_\U$ is close to 3/2, the scale can be more than the Planck mass, but with $d_\U$ around 2 the scale can be as low as a few hundred GeV. We also study the possibility of using $V (Z)\to \gamma + \U$ to constrain unparticle interactions, and find that present data give weak constraints.
|
hep-ph/0511341
|
Joao Pulido
|
Joao Pulido, B. C. Chauhan, R. S. Raghavan
|
Solar Neutrinos: Spin Flavour Precession and LMA
|
6 pages, 3 figures, contribution to 12th Lomonosov Conference in
Elementary Particle Physics, Moscow, Aug 24-31 (2005)
| null |
10.1142/9789812772657_0010
| null |
hep-ph
| null |
The time dependence that appears to be hinted by the data from the first 13
years of the solar neutrino Gallium experiments is viewed as resulting from a
partial conversion of active neutrinos to light sterile ones through the
resonant interaction between the magnetic moment of the neutrino and a varying
solar field. A summary of the model and its predictions are presented for the
forthcoming experiments Borexino and LENS.
|
[
{
"created": "Wed, 30 Nov 2005 13:17:40 GMT",
"version": "v1"
}
] |
2016-12-07
|
[
[
"Pulido",
"Joao",
""
],
[
"Chauhan",
"B. C.",
""
],
[
"Raghavan",
"R. S.",
""
]
] |
The time dependence that appears to be hinted by the data from the first 13 years of the solar neutrino Gallium experiments is viewed as resulting from a partial conversion of active neutrinos to light sterile ones through the resonant interaction between the magnetic moment of the neutrino and a varying solar field. A summary of the model and its predictions are presented for the forthcoming experiments Borexino and LENS.
|
1010.3900
|
Joern Knoll
|
Joern Knoll
|
Are back-to-back particle--antiparticle correlations observable in high
energy nuclear collisions?
|
Short Note, 4 pages, 2 figures
|
Phys.Rev.C83:044914,2011
|
10.1103/PhysRevC.83.044914
| null |
hep-ph nucl-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Analytical formulae are presented which provide quantitative estimates for
the suppression of the anticipated back-to-back particle--antiparticle
correlations in high energy nuclear collisions due to the finite duration of
the transition dynamics. They show that it is unlikely to observ the effect.
|
[
{
"created": "Tue, 19 Oct 2010 13:19:30 GMT",
"version": "v1"
}
] |
2011-05-13
|
[
[
"Knoll",
"Joern",
""
]
] |
Analytical formulae are presented which provide quantitative estimates for the suppression of the anticipated back-to-back particle--antiparticle correlations in high energy nuclear collisions due to the finite duration of the transition dynamics. They show that it is unlikely to observ the effect.
|
1203.5862
|
Daniel Whiteson
|
Ning Zhou, Daniel Whiteson, Tim M.P. Tait
|
Limits on Four-Top Production from the ATLAS Same-sign Top-quark Search
|
4 pages, 4 figures
|
Phys. Rev. D 85, 091501(R) (2012)
|
10.1103/PhysRevD.85.091501
| null |
hep-ph hep-ex
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We repurpose the recent ATLAS search for same-sign top quarks in data with
1.0 fb$^{-1}$ in the context of a search for production of four top quarks.
Using the null results of that search, we place limits on the four-top-quark
production cross section of about 1 pb. These limits are larger than the
expected Standard Model rate for four-top-quark production, but are already
strong enough to place interesting constraints on models which enhance that
rate. We interpret these results in the context of models in which the
right-handed top quark is composite and find limits on the compositeness scale
of about 700 GeV.
|
[
{
"created": "Tue, 27 Mar 2012 03:57:42 GMT",
"version": "v1"
}
] |
2012-10-08
|
[
[
"Zhou",
"Ning",
""
],
[
"Whiteson",
"Daniel",
""
],
[
"Tait",
"Tim M. P.",
""
]
] |
We repurpose the recent ATLAS search for same-sign top quarks in data with 1.0 fb$^{-1}$ in the context of a search for production of four top quarks. Using the null results of that search, we place limits on the four-top-quark production cross section of about 1 pb. These limits are larger than the expected Standard Model rate for four-top-quark production, but are already strong enough to place interesting constraints on models which enhance that rate. We interpret these results in the context of models in which the right-handed top quark is composite and find limits on the compositeness scale of about 700 GeV.
|
1202.3697
|
Michael Trott
|
J. R. Espinosa, Christophe Grojean, M. Muhlleitner and Michael Trott
|
Fingerprinting Higgs Suspects at the LHC
|
23 pp, V2 Moriond 2012 update, typos fixed
| null |
10.1007/JHEP05(2012)097
| null |
hep-ph hep-ex
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We outline a method for characterizing deviations from the properties of a
Standard Model (SM) Higgs boson. We apply it to current data in order to
characterize up to which degree the SM Higgs boson interpretation is consistent
with experiment. We find that the SM Higgs boson is consistent with the current
data set at the 82 % confidence level, based on data of excess events reported
by CMS and ATLAS, which are interpreted to be related to the mass scale mh =
124-126 GeV, and on published CL_s exclusion regions. We perform a global fit
in terms of two parameters characterizing the deviation from the SM value in
the gauge and fermion couplings of a Higgs boson. We find two minima in the
global fit and identify observables that can remove this degeneracy. An update
for Moriond 2012 data is included in the Appendix, which finds that the SM
Higgs boson is now consistent with the current data set at only the 94 %
confidence level (which corresponds to ~ 2 sigma tension compared to the best
fit point).
|
[
{
"created": "Thu, 16 Feb 2012 20:59:46 GMT",
"version": "v1"
},
{
"created": "Sat, 14 Apr 2012 19:15:54 GMT",
"version": "v2"
}
] |
2015-06-04
|
[
[
"Espinosa",
"J. R.",
""
],
[
"Grojean",
"Christophe",
""
],
[
"Muhlleitner",
"M.",
""
],
[
"Trott",
"Michael",
""
]
] |
We outline a method for characterizing deviations from the properties of a Standard Model (SM) Higgs boson. We apply it to current data in order to characterize up to which degree the SM Higgs boson interpretation is consistent with experiment. We find that the SM Higgs boson is consistent with the current data set at the 82 % confidence level, based on data of excess events reported by CMS and ATLAS, which are interpreted to be related to the mass scale mh = 124-126 GeV, and on published CL_s exclusion regions. We perform a global fit in terms of two parameters characterizing the deviation from the SM value in the gauge and fermion couplings of a Higgs boson. We find two minima in the global fit and identify observables that can remove this degeneracy. An update for Moriond 2012 data is included in the Appendix, which finds that the SM Higgs boson is now consistent with the current data set at only the 94 % confidence level (which corresponds to ~ 2 sigma tension compared to the best fit point).
|
hep-ph/0608262
|
Hyun-Chul Kim
|
Klaus Goeke, Hyun-Chul Kim, Antonio Silva, and Diana Urbano
|
Strange nucleon form factors: Solitonic approach to $G_{M}^{s}$,
$G_{E}^{s}$, $\tilde{G}_{A}^{p}$ and $\tilde{G}_{A}^{n}$ and comparison with
world data
|
5 pages, 8 figures, a talk presented at the International Workshop
"From Parity Violation to Hadronic Structure and more..." held from May 16
through May 20, 2006 on the island of Milos, Greece
|
Eur.Phys.J.A32:393-397,2007
|
10.1140/epja/i2006-10398-7
|
PNU-NTG-04/2006, PNU-NURI-05/2006
|
hep-ph
| null |
We summarize the results of the chiral quark-soliton model ($\chi$QSM)
concerning basically all form factors necessary to interpret the present data
of the parity violating electron scattering experiments SAMPLE, HAPPEX, A4 and
G0. The results particularly focus on the recently measured asymmetries and the
detailed data for various combinations of $G_{M}^{s}$, $G_{E}^{s}$,
$\tilde{G}_{A}^{p}$ and $\tilde{G}_{A}^{n}$ at $Q^2=0.1$ GeV$^2$. The
calculations yield positive strange magnetic and electric form factors and a
negative axial vector one, all being rather small. The results are very close
to the combined experimental world data from parity violating electron
scattering and elastic $\nu p$- and $\bar{\nu p}$- scattering.
|
[
{
"created": "Wed, 23 Aug 2006 19:13:28 GMT",
"version": "v1"
}
] |
2008-11-26
|
[
[
"Goeke",
"Klaus",
""
],
[
"Kim",
"Hyun-Chul",
""
],
[
"Silva",
"Antonio",
""
],
[
"Urbano",
"Diana",
""
]
] |
We summarize the results of the chiral quark-soliton model ($\chi$QSM) concerning basically all form factors necessary to interpret the present data of the parity violating electron scattering experiments SAMPLE, HAPPEX, A4 and G0. The results particularly focus on the recently measured asymmetries and the detailed data for various combinations of $G_{M}^{s}$, $G_{E}^{s}$, $\tilde{G}_{A}^{p}$ and $\tilde{G}_{A}^{n}$ at $Q^2=0.1$ GeV$^2$. The calculations yield positive strange magnetic and electric form factors and a negative axial vector one, all being rather small. The results are very close to the combined experimental world data from parity violating electron scattering and elastic $\nu p$- and $\bar{\nu p}$- scattering.
|
1510.02209
|
Jambul Gegelia
|
M. C. Birse, E. Epelbaum, J. Gegelia
|
New fixed points of the renormalisation group for two-body scattering
|
6 pages, no figures
| null |
10.1140/epja/i2016-16026-1
| null |
hep-ph nucl-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We outline a separable matrix ansatz for the potentials in effective field
theories of nonrelativistic two-body systems with short-range interactions. We
use this ansatz to construct new fixed points of the renormalisation-group
equation for these potentials. New fixed points indicate a much richer
structure than previously recognized in the RG flows of simple short-range
potentials.
|
[
{
"created": "Thu, 8 Oct 2015 07:20:52 GMT",
"version": "v1"
}
] |
2016-03-23
|
[
[
"Birse",
"M. C.",
""
],
[
"Epelbaum",
"E.",
""
],
[
"Gegelia",
"J.",
""
]
] |
We outline a separable matrix ansatz for the potentials in effective field theories of nonrelativistic two-body systems with short-range interactions. We use this ansatz to construct new fixed points of the renormalisation-group equation for these potentials. New fixed points indicate a much richer structure than previously recognized in the RG flows of simple short-range potentials.
|
hep-ph/9611218
|
Martin Beneke
|
M. Beneke (CERN) and M. Kraemer (Rutherford Lab.)
|
Direct J/psi and psi' Polarization and Cross Sections at the Tevatron
|
11 pages, LaTeX, 3 figures included via epsf.sty
|
Phys.Rev.D55:5269-5272,1997
|
10.1103/PhysRevD.55.5269
|
CERN-TH/96-310
|
hep-ph
| null |
Transverse polarization of ${}^3 S_1$ charmonium states, produced directly in
$p\bar{p}$ collisions at asymptotically large transverse momentum p_t, has
emerged as the most prominent test of color octet contributions and spin
symmetry in quarkonium production. We present predictions for the polar angle
distribution at moderate values of p_t \sim 4 - 20 GeV, covered by the Tevatron
Run I data. We update the fits of NRQCD matrix elements and discuss their
theoretical uncertainties. With our best fit values, no transverse polarization
is expected at p_t \sim 5 GeV, but the angular distribution is predicted to
change dramatically as p_t increases to 20 GeV.
|
[
{
"created": "Sun, 3 Nov 1996 18:49:21 GMT",
"version": "v1"
}
] |
2016-09-06
|
[
[
"Beneke",
"M.",
"",
"CERN"
],
[
"Kraemer",
"M.",
"",
"Rutherford Lab."
]
] |
Transverse polarization of ${}^3 S_1$ charmonium states, produced directly in $p\bar{p}$ collisions at asymptotically large transverse momentum p_t, has emerged as the most prominent test of color octet contributions and spin symmetry in quarkonium production. We present predictions for the polar angle distribution at moderate values of p_t \sim 4 - 20 GeV, covered by the Tevatron Run I data. We update the fits of NRQCD matrix elements and discuss their theoretical uncertainties. With our best fit values, no transverse polarization is expected at p_t \sim 5 GeV, but the angular distribution is predicted to change dramatically as p_t increases to 20 GeV.
|
hep-ph/0410120
|
C. A. de S. Pires
|
C. A. de S. Pires
|
Photon deflection by a Coulomb field in noncommutative QED
|
07 pages, some typos corrected, accepted for publication in JPG
|
J.Phys. G30 (2004) B41
|
10.1088/0954-3899/30/12/B01
| null |
hep-ph hep-th
| null |
In noncommutative QED photons present self-interactions in the form of triple
and quartic interactions. The triple interaction implies that, even though the
photon is electrically neutral, it will deflect when in the presence of an
electromagnetic field. If detected, such deflection would be an undoubted
signal of noncommutative space-time. In this work we derive the general
expression for the deflection of a photon by any electromagnetic field. As an
application we consider the case of the deflection of a photon by an external
static Coulomb field.
|
[
{
"created": "Thu, 7 Oct 2004 21:16:00 GMT",
"version": "v1"
},
{
"created": "Tue, 2 Nov 2004 12:21:20 GMT",
"version": "v2"
}
] |
2015-06-25
|
[
[
"Pires",
"C. A. de S.",
""
]
] |
In noncommutative QED photons present self-interactions in the form of triple and quartic interactions. The triple interaction implies that, even though the photon is electrically neutral, it will deflect when in the presence of an electromagnetic field. If detected, such deflection would be an undoubted signal of noncommutative space-time. In this work we derive the general expression for the deflection of a photon by any electromagnetic field. As an application we consider the case of the deflection of a photon by an external static Coulomb field.
|
1206.0097
|
Xiang Liu
|
Zao-Chen Ye, Xiao Wang, Xiang Liu and Qiang Zhao
|
The mass spectrum and strong decays of isoscalar tensor mesons
|
12 pages, 3 tables and 10 figures. More discussions and references
added. Accepted by Phys. Rev. D
|
Phys.Rev.D86:054025,2012
|
10.1103/PhysRevD.86.054025
| null |
hep-ph hep-ex
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
In this work, we present a systematic study of the observed isoscalar tensor
$f_2$ states. With the detailed analysis of the mass spectrum and calculation
of the $f_2$ two-body strong decays, we extract information of their underly
structures, and try to categorize them into the conventional tensor meson
family ($n^{3}P_{2}$ $(n=1,2,3,4)$ and $m^{3}F_{2}$ ($m=1,2$)). We also give
predictions for other decay modes of these tensor mesons, which are useful for
further experimental investigations.
|
[
{
"created": "Fri, 1 Jun 2012 06:59:20 GMT",
"version": "v1"
},
{
"created": "Wed, 15 Aug 2012 00:51:39 GMT",
"version": "v2"
}
] |
2012-09-27
|
[
[
"Ye",
"Zao-Chen",
""
],
[
"Wang",
"Xiao",
""
],
[
"Liu",
"Xiang",
""
],
[
"Zhao",
"Qiang",
""
]
] |
In this work, we present a systematic study of the observed isoscalar tensor $f_2$ states. With the detailed analysis of the mass spectrum and calculation of the $f_2$ two-body strong decays, we extract information of their underly structures, and try to categorize them into the conventional tensor meson family ($n^{3}P_{2}$ $(n=1,2,3,4)$ and $m^{3}F_{2}$ ($m=1,2$)). We also give predictions for other decay modes of these tensor mesons, which are useful for further experimental investigations.
|
hep-ph/9909320
|
Bjoern Poetter
|
B. P\"otter
|
Forward Jet Production at HERA
|
10 pages, 4 eps figures; talk given at the Ringberg Workshop 'New
Trends in HERA Physics 1999'
| null | null |
MPI/PhT/99-042
|
hep-ph
| null |
We discuss forward jet production data recently published by the H1 and ZEUS
collaborations at HERA. We review how several Monte-Carlo models compare to the
data. QCD calculations based on the BFKL formalism and on fixed NLO
perturbation theory with and without resolved virtual photons are described.
|
[
{
"created": "Fri, 10 Sep 1999 14:40:49 GMT",
"version": "v1"
}
] |
2007-05-23
|
[
[
"Pötter",
"B.",
""
]
] |
We discuss forward jet production data recently published by the H1 and ZEUS collaborations at HERA. We review how several Monte-Carlo models compare to the data. QCD calculations based on the BFKL formalism and on fixed NLO perturbation theory with and without resolved virtual photons are described.
|
0901.1373
|
Dmitri Diakonov
|
Dmitri Diakonov (St. Petersburg NPI)
|
Justifying the exotic Theta+ pentaquark
|
3 p., contribution to the PANIC-08 proceedings
|
Nucl.Phys.A827:264c-266c,2009
|
10.1016/j.nuclphysa.2009.05.052
| null |
hep-ph hep-ex nucl-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
The existence of a light S=+1 baryon resonance follows from Quantum Field
Theory applied to baryons. This is illustrated in the Skyrme model (where
Theta+ exists but is too strong) and in a new mean field approach where Theta+
arises as a consequence of three known resonances: Lambda(1405), N(1440) and
N(1535).
|
[
{
"created": "Sat, 10 Jan 2009 13:15:52 GMT",
"version": "v1"
}
] |
2010-02-25
|
[
[
"Diakonov",
"Dmitri",
"",
"St. Petersburg NPI"
]
] |
The existence of a light S=+1 baryon resonance follows from Quantum Field Theory applied to baryons. This is illustrated in the Skyrme model (where Theta+ exists but is too strong) and in a new mean field approach where Theta+ arises as a consequence of three known resonances: Lambda(1405), N(1440) and N(1535).
|
2301.08059
|
Yanrui Liu
|
Jun Jiang, Shao-Zhou Jiang, Shi-Yuan Li, Yan-Rui Liu, Zong-Guo Si,
Hong-Qian Wang
|
Relations for low-energy constants in baryon chiral perturbation theory
with explicit $\Delta(1232)$ derived from the chiral quark model
|
Version accepted by Eur. Phys. J. C. 10 pages, 2 figures, 4 tables
|
Eur. Phys. J. C 83, 296 (2023)
|
10.1140/epjc/s10052-023-11446-6
| null |
hep-ph hep-lat nucl-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We study the relations between low-energy constants (LECs) in the chiral
Lagrangians with $\Delta(1232)$ and those in the quark-level description model
up to the third chiral order. Ten structure correspondences are involved in
getting the relations. This situation is more complicated than the spin-1/2
baryon case. The obtained results may help to further investigations involving
the $\Delta(1232)$ baryons.
|
[
{
"created": "Thu, 19 Jan 2023 13:15:17 GMT",
"version": "v1"
},
{
"created": "Sun, 16 Apr 2023 01:05:31 GMT",
"version": "v2"
}
] |
2023-04-18
|
[
[
"Jiang",
"Jun",
""
],
[
"Jiang",
"Shao-Zhou",
""
],
[
"Li",
"Shi-Yuan",
""
],
[
"Liu",
"Yan-Rui",
""
],
[
"Si",
"Zong-Guo",
""
],
[
"Wang",
"Hong-Qian",
""
]
] |
We study the relations between low-energy constants (LECs) in the chiral Lagrangians with $\Delta(1232)$ and those in the quark-level description model up to the third chiral order. Ten structure correspondences are involved in getting the relations. This situation is more complicated than the spin-1/2 baryon case. The obtained results may help to further investigations involving the $\Delta(1232)$ baryons.
|
hep-ph/0609133
|
Mahiko Suzuki
|
Mahiko Suzuki
|
Partial waves of baryon-antibaryon in three-body B meson decay
|
16 pages, 9 figures, the version for journal publication
|
J.Phys.G34:283-298,2007
|
10.1088/0954-3899/34/2/009
|
LBNL-61605
|
hep-ph
| null |
The conspicuous threshold enhancement has been observed in the
baryon-antibaryon subchannels of many three-body B decay modes. By examining
the partial waves of baryon-antibaryon, we first show for B- -->pp-bar K- that
the pK- angular correlation rules out dominance of a single pp-bar partial wave
for the enhancement, for instance, the resonance hypothesis or the strong
final-state interaction in a single channel. The measured pK- angular
correlation turns out to be opposite to the naive expectation of the
short-distance picture. We study the origin of this reversed angular
correlation in the context of the pp-bar partial waves and argue that NN-bar
bound states may be the cause of this sign reversal. Dependence of the angular
correlation on the pp-bar invariant mass is very important to probe the
underlying problem from the experimental side.
|
[
{
"created": "Wed, 13 Sep 2006 22:31:01 GMT",
"version": "v1"
},
{
"created": "Wed, 27 Sep 2006 22:08:03 GMT",
"version": "v2"
},
{
"created": "Mon, 27 Nov 2006 22:53:25 GMT",
"version": "v3"
}
] |
2008-11-26
|
[
[
"Suzuki",
"Mahiko",
""
]
] |
The conspicuous threshold enhancement has been observed in the baryon-antibaryon subchannels of many three-body B decay modes. By examining the partial waves of baryon-antibaryon, we first show for B- -->pp-bar K- that the pK- angular correlation rules out dominance of a single pp-bar partial wave for the enhancement, for instance, the resonance hypothesis or the strong final-state interaction in a single channel. The measured pK- angular correlation turns out to be opposite to the naive expectation of the short-distance picture. We study the origin of this reversed angular correlation in the context of the pp-bar partial waves and argue that NN-bar bound states may be the cause of this sign reversal. Dependence of the angular correlation on the pp-bar invariant mass is very important to probe the underlying problem from the experimental side.
|
2203.04319
|
Benjamin Safdi
|
Christopher Dessert, David Dunsky, Benjamin R. Safdi
|
Upper limit on the axion-photon coupling from magnetic white dwarf
polarization
|
22 pages, 9 figures
| null |
10.1103/PhysRevD.105.103034
| null |
hep-ph astro-ph.SR
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Polarization measurements of thermal radiation from magnetic white dwarf
(MWD) stars have been proposed as a probe of axion-photon mixing. The radiation
leaving the surface of the MWD is unpolarized, but if low-mass axions exist
then photons polarized parallel to the direction of the MWD's magnetic field
may convert into axions, which induces a linear polarization dependent on the
strength of the axion-photon coupling $g_{a\gamma\gamma}$. We model this
process by using the formalism of axion-photon mixing in the presence of
strong-field vacuum birefringence to show that of all stellar types MWDs are
the most promising targets for axion-induced polarization searches. We then
consider linear polarization data from multiple MWDs, including SDSS J135141
and Grw+70$^\circ$8247, to show that after rigorously accounting for
astrophysical uncertainties the axion-photon coupling is constrained to
$|g_{a\gamma\gamma}| \lesssim 5.4 \times 10^{-12}$ GeV$^{-1}$ at 95% confidence
for axion masses $m_a \lesssim 3 \times 10^{-7}$ eV. This upper limit puts in
tension the previously-suggested explanation of the anomalous transparency of
the Universe to TeV gamma-rays in terms of axions. We identify MWD targets for
which future data and modeling efforts could further improve the sensitivity to
axions.
|
[
{
"created": "Tue, 8 Mar 2022 19:00:00 GMT",
"version": "v1"
}
] |
2022-06-08
|
[
[
"Dessert",
"Christopher",
""
],
[
"Dunsky",
"David",
""
],
[
"Safdi",
"Benjamin R.",
""
]
] |
Polarization measurements of thermal radiation from magnetic white dwarf (MWD) stars have been proposed as a probe of axion-photon mixing. The radiation leaving the surface of the MWD is unpolarized, but if low-mass axions exist then photons polarized parallel to the direction of the MWD's magnetic field may convert into axions, which induces a linear polarization dependent on the strength of the axion-photon coupling $g_{a\gamma\gamma}$. We model this process by using the formalism of axion-photon mixing in the presence of strong-field vacuum birefringence to show that of all stellar types MWDs are the most promising targets for axion-induced polarization searches. We then consider linear polarization data from multiple MWDs, including SDSS J135141 and Grw+70$^\circ$8247, to show that after rigorously accounting for astrophysical uncertainties the axion-photon coupling is constrained to $|g_{a\gamma\gamma}| \lesssim 5.4 \times 10^{-12}$ GeV$^{-1}$ at 95% confidence for axion masses $m_a \lesssim 3 \times 10^{-7}$ eV. This upper limit puts in tension the previously-suggested explanation of the anomalous transparency of the Universe to TeV gamma-rays in terms of axions. We identify MWD targets for which future data and modeling efforts could further improve the sensitivity to axions.
|
hep-ph/0303015
|
Wolfgang Kilian
|
W. Kilian
|
Dynamical Electroweak Symmetry Breaking
|
35pp, references updated, to appear in: "Linear Collider Physics in
the New Millennium", K. Fujii, D. Miller and A. Soni (eds.), World Scientific
| null | null |
DESY 03-026, TTP-03-09
|
hep-ph
| null |
Dynamical symmetry breaking provides a possible solution to the electroweak
hierarchy problem. It requires new strong interactions that are effective at
some high-energy scale. If there is no light Higgs boson, this scale is
constrained to be in the TeV range, and signals of the new interactions can be
observed, directly or indirectly, in collider experiments. Even if no
observable states in the Higgs sector are kinematically accessible, a Linear
Collider will cover the low-energy parameter space that arises in a systematic
model-independent analysis of dynamical electroweak symmetry breaking.
|
[
{
"created": "Tue, 4 Mar 2003 17:36:43 GMT",
"version": "v1"
},
{
"created": "Mon, 28 Apr 2003 12:44:26 GMT",
"version": "v2"
}
] |
2009-09-29
|
[
[
"Kilian",
"W.",
""
]
] |
Dynamical symmetry breaking provides a possible solution to the electroweak hierarchy problem. It requires new strong interactions that are effective at some high-energy scale. If there is no light Higgs boson, this scale is constrained to be in the TeV range, and signals of the new interactions can be observed, directly or indirectly, in collider experiments. Even if no observable states in the Higgs sector are kinematically accessible, a Linear Collider will cover the low-energy parameter space that arises in a systematic model-independent analysis of dynamical electroweak symmetry breaking.
|
2004.12326
|
Anubhav Mathur
|
Anubhav Mathur, Surjeet Rajendran, Erwin H. Tanin
|
Clocking Out Superradiance Limits
|
12 pages, 1 figure
|
Phys. Rev. D 102, 055015 (2020)
|
10.1103/PhysRevD.102.055015
| null |
hep-ph astro-ph.CO gr-qc
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
The superradiant instability of black hole space-times has been used to place
limits on ultra-light bosonic particles. We show that these limits are model
dependent. While the initial growth of the mode is gravitational and thus model
independent, the ability to place a limit on new particles requires the mode to
grow unhindered to a large number density. Non-linear interactions between the
particle and other light degrees of freedom that are mediated through higher
dimension operators can damp this growth, eliminating the limit. However, these
non-linearities may also destroy a cosmic abundance of these light particles,
an attractive avenue for their discovery in several experiments. We study the
specific example of the QCD axion and show that it is easy to construct models
where these non-linearities eliminate limits from superradiance while
preserving their cosmic abundance.
|
[
{
"created": "Sun, 26 Apr 2020 09:26:20 GMT",
"version": "v1"
}
] |
2020-09-30
|
[
[
"Mathur",
"Anubhav",
""
],
[
"Rajendran",
"Surjeet",
""
],
[
"Tanin",
"Erwin H.",
""
]
] |
The superradiant instability of black hole space-times has been used to place limits on ultra-light bosonic particles. We show that these limits are model dependent. While the initial growth of the mode is gravitational and thus model independent, the ability to place a limit on new particles requires the mode to grow unhindered to a large number density. Non-linear interactions between the particle and other light degrees of freedom that are mediated through higher dimension operators can damp this growth, eliminating the limit. However, these non-linearities may also destroy a cosmic abundance of these light particles, an attractive avenue for their discovery in several experiments. We study the specific example of the QCD axion and show that it is easy to construct models where these non-linearities eliminate limits from superradiance while preserving their cosmic abundance.
|
1802.01607
|
Shankha Banerjee
|
Shankha Banerjee, Christoph Englert, Michelangelo L. Mangano, Michele
Selvaggi and Michael Spannowsky
|
$hh+\text{jet}$ production at 100 TeV
|
v2: 24 pages, 6 figures and 9 tables; clarifications in the text,
cut-based analysis and references added; accepted for publication in EPJC
|
Eur. Phys. J. C (2018) 78: 322
|
10.1140/epjc/s10052-018-5788-y
|
IPPP/18/10, LAPTH-003/18, CERN-TH-2018-023
|
hep-ph hep-ex
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Higgs pair production is a crucial phenomenological process in deciphering
the nature of the TeV scale and the mechanism underlying electroweak symmetry
breaking. At the Large Hadron Collider, this process is statistically limited.
Pushing the energy frontier beyond the LHC's reach will create new
opportunities to exploit the rich phenomenology at higher centre-of-mass
energies and luminosities. In this work, we perform a comparative analysis of
the $hh+\text{jet}$ channel at a future 100 TeV hadron collider. We focus on
the $hh\to b\bar b b\bar b$ and $hh \to b\bar b \tau^+\tau^-$ channels and
employ a range of analysis techniques to estimate the sensitivity potential
that can be gained by including this jet-associated Higgs pair production to
the list of sensitive collider processes in such an environment. In particular,
we observe that $hh \to b\bar b \tau^+\tau^-$ in the boosted regime exhibits a
large sensitivity to the Higgs boson self-coupling and the Higgs self-coupling
could be constrained at the 8\% level in this channel alone.
|
[
{
"created": "Mon, 5 Feb 2018 19:15:36 GMT",
"version": "v1"
},
{
"created": "Mon, 9 Apr 2018 14:48:51 GMT",
"version": "v2"
}
] |
2018-04-24
|
[
[
"Banerjee",
"Shankha",
""
],
[
"Englert",
"Christoph",
""
],
[
"Mangano",
"Michelangelo L.",
""
],
[
"Selvaggi",
"Michele",
""
],
[
"Spannowsky",
"Michael",
""
]
] |
Higgs pair production is a crucial phenomenological process in deciphering the nature of the TeV scale and the mechanism underlying electroweak symmetry breaking. At the Large Hadron Collider, this process is statistically limited. Pushing the energy frontier beyond the LHC's reach will create new opportunities to exploit the rich phenomenology at higher centre-of-mass energies and luminosities. In this work, we perform a comparative analysis of the $hh+\text{jet}$ channel at a future 100 TeV hadron collider. We focus on the $hh\to b\bar b b\bar b$ and $hh \to b\bar b \tau^+\tau^-$ channels and employ a range of analysis techniques to estimate the sensitivity potential that can be gained by including this jet-associated Higgs pair production to the list of sensitive collider processes in such an environment. In particular, we observe that $hh \to b\bar b \tau^+\tau^-$ in the boosted regime exhibits a large sensitivity to the Higgs boson self-coupling and the Higgs self-coupling could be constrained at the 8\% level in this channel alone.
|
1405.6921
|
Laura Lopez Honorez
|
Federica Giacchino, Laura Lopez-Honorez and Michel H.G. Tytgat
|
Bremsstrahlung and Gamma Ray Lines in 3 Scenarios of Dark Matter
Annihilation
|
20 pages, 7 figures
| null |
10.1088/1475-7516/2014/08/046
|
ULB-TH/14-10, LPT-Orsay-14-28
|
hep-ph astro-ph.CO
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Gamma ray spectral features are of interest for indirect searches of dark
matter (DM). Following Barger et al, we consider 3 simple scenarios of DM that
annihilates into Standard Model (SM) fermion pairs. Scenario 1 is a Majorana DM
candidate coupled to a charged scalar, scenario 2 is a Majorana DM coupled to a
charged gauge boson and scenario 3 is a real scalar DM coupled a charged
vector-like fermion. As shown by Barger et al, these 3 scenarios share
precisely the same internal Bremsstrahlung spectral signature into gamma rays.
Their phenomenology is however distinct. In particular for annihilation into
light SM fermions, in the chiral limit, the 2-body annihilation cross section
is p-wave suppressed for the Majorana candidates while it is d-wave suppressed
for the real scalar. In the present work we study the annihilation into 2
gammas, showing that these three scenarios have distinct, and so potentially
distinguishable, spectral signatures into gamma rays. In the case of the real
scalar candidate we provide a new calculation of the amplitude for annihilation
into 2 gammas.
|
[
{
"created": "Tue, 27 May 2014 14:14:40 GMT",
"version": "v1"
}
] |
2015-06-19
|
[
[
"Giacchino",
"Federica",
""
],
[
"Lopez-Honorez",
"Laura",
""
],
[
"Tytgat",
"Michel H. G.",
""
]
] |
Gamma ray spectral features are of interest for indirect searches of dark matter (DM). Following Barger et al, we consider 3 simple scenarios of DM that annihilates into Standard Model (SM) fermion pairs. Scenario 1 is a Majorana DM candidate coupled to a charged scalar, scenario 2 is a Majorana DM coupled to a charged gauge boson and scenario 3 is a real scalar DM coupled a charged vector-like fermion. As shown by Barger et al, these 3 scenarios share precisely the same internal Bremsstrahlung spectral signature into gamma rays. Their phenomenology is however distinct. In particular for annihilation into light SM fermions, in the chiral limit, the 2-body annihilation cross section is p-wave suppressed for the Majorana candidates while it is d-wave suppressed for the real scalar. In the present work we study the annihilation into 2 gammas, showing that these three scenarios have distinct, and so potentially distinguishable, spectral signatures into gamma rays. In the case of the real scalar candidate we provide a new calculation of the amplitude for annihilation into 2 gammas.
|
2310.12398
|
Zhuo Yu
|
Zhuo Yu and Qi Wu and Dian-Yong Chen
|
$X_0(2900)$ and its spin partners production in the $B^+$ decay process
| null | null | null | null |
hep-ph hep-ex
|
http://creativecommons.org/licenses/by/4.0/
|
In the present work, we investigate $X_0(2900)$ and its spin partners
productions in the $B^+$ decay processes, where $X_0(2900)$ is regarded as a
$\bar{D}^\ast K^\ast$ molecular state. We infer that the initial $B^+$ meson
and the final $D^+ X_0(2900)$ are connected through $D_{s1}^+(2460)
\bar{D}^{\ast 0} $ mesons by exchanging a $K^{\ast 0}$ meson. The contributions
from such a meson loop to the process $B^+ \to D^+ X_0(2900)$ are evaluated and
our estimations indicate that the measured branching fraction of $B^+\to D^+
X_0(2900)$ could be well reproduced in a reasonable model parameter range,
which indicates that $X_0(2900)$ could be interpreted as a $\bar{D}^\ast K^\ast
$ molecular state. In addition, the production processes $B^+ \to D^+
\tilde{X}_{1,2}$, $B^+ \to D^{\ast +} X_0(2900)$, and $B^+ \to D^{\ast
+}\tilde{X}_{1,2}$ are investigated, and we find that the fit fraction of
$\tilde{X}_1$ in the process $B^+ \to D^{\ast +} D^{\ast -} K^+$ is aobut
$6\%$, which should be accessible experimentally.
|
[
{
"created": "Thu, 19 Oct 2023 00:56:48 GMT",
"version": "v1"
},
{
"created": "Sat, 4 May 2024 07:09:18 GMT",
"version": "v2"
}
] |
2024-05-07
|
[
[
"Yu",
"Zhuo",
""
],
[
"Wu",
"Qi",
""
],
[
"Chen",
"Dian-Yong",
""
]
] |
In the present work, we investigate $X_0(2900)$ and its spin partners productions in the $B^+$ decay processes, where $X_0(2900)$ is regarded as a $\bar{D}^\ast K^\ast$ molecular state. We infer that the initial $B^+$ meson and the final $D^+ X_0(2900)$ are connected through $D_{s1}^+(2460) \bar{D}^{\ast 0} $ mesons by exchanging a $K^{\ast 0}$ meson. The contributions from such a meson loop to the process $B^+ \to D^+ X_0(2900)$ are evaluated and our estimations indicate that the measured branching fraction of $B^+\to D^+ X_0(2900)$ could be well reproduced in a reasonable model parameter range, which indicates that $X_0(2900)$ could be interpreted as a $\bar{D}^\ast K^\ast $ molecular state. In addition, the production processes $B^+ \to D^+ \tilde{X}_{1,2}$, $B^+ \to D^{\ast +} X_0(2900)$, and $B^+ \to D^{\ast +}\tilde{X}_{1,2}$ are investigated, and we find that the fit fraction of $\tilde{X}_1$ in the process $B^+ \to D^{\ast +} D^{\ast -} K^+$ is aobut $6\%$, which should be accessible experimentally.
|
1011.0757
|
Frank J. Petriello
|
Sonny Mantry, Frank Petriello
|
Transverse Momentum Distributions in the Non-Perturbative Region
|
13 pages, 2 figures; typos fixed
|
Phys.Rev.D84:014030,2011
|
10.1103/PhysRevD.84.014030
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We study the low transverse momentum (p_T) distribution of the Z-boson at
hadron colliders for p_T ~ Lambda_{QCD} using a factorization and resummation
formula derived in the Soft Collinear Effective Theory (SCET). In the region
p_T ~ Lambda_{QCD}, new non-perturbative effects arise that cannot be entirely
captured by the standard parton distribution functions, and require an
additional new non-perturbative transverse momentum function (TMF). The TMF is
field-theoretically defined in SCET, fully gauge invariant, and captures the
non-perturbative dynamics that affects the p_T-distribution in the region p_T ~
Lambda_{QCD}. The TMF also reduces to the expected perturbative result in the
region p_T >> Lambda_{QCD}. We develop phenomenological models for these TMFs
in the non-perturbative region and present example fits to the available data.
|
[
{
"created": "Tue, 2 Nov 2010 21:35:59 GMT",
"version": "v1"
},
{
"created": "Thu, 4 Nov 2010 03:35:52 GMT",
"version": "v2"
}
] |
2011-08-09
|
[
[
"Mantry",
"Sonny",
""
],
[
"Petriello",
"Frank",
""
]
] |
We study the low transverse momentum (p_T) distribution of the Z-boson at hadron colliders for p_T ~ Lambda_{QCD} using a factorization and resummation formula derived in the Soft Collinear Effective Theory (SCET). In the region p_T ~ Lambda_{QCD}, new non-perturbative effects arise that cannot be entirely captured by the standard parton distribution functions, and require an additional new non-perturbative transverse momentum function (TMF). The TMF is field-theoretically defined in SCET, fully gauge invariant, and captures the non-perturbative dynamics that affects the p_T-distribution in the region p_T ~ Lambda_{QCD}. The TMF also reduces to the expected perturbative result in the region p_T >> Lambda_{QCD}. We develop phenomenological models for these TMFs in the non-perturbative region and present example fits to the available data.
|
hep-ph/9708468
|
Leonid Burakovsky
|
L. Burakovsky, L.P. Horwitz and T. Goldman
|
New Quadratic Mass Relations for Heavy Mesons
|
17 pages, LaTeX
| null | null |
FERMILAB-PUB-97/265-T
|
hep-ph
| null |
By assuming the existence of (quasi)-linear Regge trajectories for heavy
mesons, we derive new quadratic mass relations of non-Gell-Mann-Okubo type,
6M^2(q-qbar)+3M^2(c-cbar)=8M^2(c-qbar), 20M^2(q-qbar)+5M^2(b-bbar)=
16M^2(b-qbar), q=n(=u,d),s, which show excellent agreement with experiment. We
also establish the sum rule M^2(i-ibar)+M^2(j-jbar)-2M^2(j-ibar)\approx const
for any pair of flavors, (i,j).
|
[
{
"created": "Tue, 26 Aug 1997 19:25:10 GMT",
"version": "v1"
}
] |
2007-05-23
|
[
[
"Burakovsky",
"L.",
""
],
[
"Horwitz",
"L. P.",
""
],
[
"Goldman",
"T.",
""
]
] |
By assuming the existence of (quasi)-linear Regge trajectories for heavy mesons, we derive new quadratic mass relations of non-Gell-Mann-Okubo type, 6M^2(q-qbar)+3M^2(c-cbar)=8M^2(c-qbar), 20M^2(q-qbar)+5M^2(b-bbar)= 16M^2(b-qbar), q=n(=u,d),s, which show excellent agreement with experiment. We also establish the sum rule M^2(i-ibar)+M^2(j-jbar)-2M^2(j-ibar)\approx const for any pair of flavors, (i,j).
|
1312.4965
|
Neal Weiner
|
Daniele S.M. Alves, Jia Liu, Neal Weiner
|
Hiding Missing Energy in Missing Energy
|
7 pages, 7 figures
|
JHEP 1504 (2015) 088
|
10.1007/JHEP04(2015)088
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Searches for supersymmetry (SUSY) often rely on a combination of hard physics
objects (jets, leptons) along with large missing transverse energy to separate
New Physics from Standard Model hard processes. We consider a class of
``double-invisible'' SUSY scenarios: where squarks, stops and sbottoms have a
three-body decay into two (rather than one) invisible final-state particles.
This occurs naturally when the LSP carries an additional conserved quantum
number under which other superpartners are not charged. In these topologies,
the available energy is diluted into invisible particles, reducing the observed
missing energy and visible energy. This can lead to sizable changes in the
sensitivity of existing searches, dramatically changing the qualitative
constraints on superpartners. In particular, for m_LSP>160 GeV, we find no
robust constraints from the LHC at any squark mass for any generation, while
for lighter LSPs we find significant reductions in constraints. If confirmed by
a full reanalysis from the collaborations, such scenarios allow for the
possibility of significantly more natural SUSY models. While not realized in
the MSSM, such phenomenology occurs naturally in models with mixed sneutrinos,
Dirac gauginos and NMSSM-like models.
|
[
{
"created": "Tue, 17 Dec 2013 21:00:24 GMT",
"version": "v1"
}
] |
2015-05-28
|
[
[
"Alves",
"Daniele S. M.",
""
],
[
"Liu",
"Jia",
""
],
[
"Weiner",
"Neal",
""
]
] |
Searches for supersymmetry (SUSY) often rely on a combination of hard physics objects (jets, leptons) along with large missing transverse energy to separate New Physics from Standard Model hard processes. We consider a class of ``double-invisible'' SUSY scenarios: where squarks, stops and sbottoms have a three-body decay into two (rather than one) invisible final-state particles. This occurs naturally when the LSP carries an additional conserved quantum number under which other superpartners are not charged. In these topologies, the available energy is diluted into invisible particles, reducing the observed missing energy and visible energy. This can lead to sizable changes in the sensitivity of existing searches, dramatically changing the qualitative constraints on superpartners. In particular, for m_LSP>160 GeV, we find no robust constraints from the LHC at any squark mass for any generation, while for lighter LSPs we find significant reductions in constraints. If confirmed by a full reanalysis from the collaborations, such scenarios allow for the possibility of significantly more natural SUSY models. While not realized in the MSSM, such phenomenology occurs naturally in models with mixed sneutrinos, Dirac gauginos and NMSSM-like models.
|
hep-ph/9710292
|
Tanmay Vachaspati
|
Tanmay Vachaspati (CWRU)
|
Formation of Topological Defects
|
34 pages, 7 figures. Based on lectures at ICTP, Summer School on
Cosmology, July 1997.
| null | null |
CWRU-P18-97
|
hep-ph astro-ph hep-th
| null |
In these lectures, I review cosmological phase transitions and the
topological aspects of spontaneous symmetry breaking. I then discuss the
formation of walls, strings and monopoles during phase transitions including
lattice based studies of defect formation and recent attempts to go beyond the
lattice. The close connection of defect formation with percolation is
described. Open problems and possible future directions are mentioned.
|
[
{
"created": "Thu, 9 Oct 1997 23:26:46 GMT",
"version": "v1"
}
] |
2007-05-23
|
[
[
"Vachaspati",
"Tanmay",
"",
"CWRU"
]
] |
In these lectures, I review cosmological phase transitions and the topological aspects of spontaneous symmetry breaking. I then discuss the formation of walls, strings and monopoles during phase transitions including lattice based studies of defect formation and recent attempts to go beyond the lattice. The close connection of defect formation with percolation is described. Open problems and possible future directions are mentioned.
|
2301.02314
|
Mauricio Narciso Ferreira
|
M. N. Ferreira and J. Papavassiliou
|
Gauge Sector Dynamics in QCD
|
57 pages, 23 figures
|
Particles 6 (2023) 1, 312-363
|
10.3390/particles6010017
| null |
hep-ph hep-lat hep-th nucl-th
|
http://creativecommons.org/licenses/by/4.0/
|
The dynamics of the gauge sector of QCD give rise to nonperturbative
phenomena that are crucial for the internal consistency of the theory; most
notably, they account for the generation of a gluon mass through the action of
the Schwinger mechanism, the taming of the Landau pole and the ensuing
stabilization of the gauge coupling, and the infrared suppression of the
three-gluon vertex. In the present work, we review some key advances in the
ongoing investigation of this sector within the framework of the continuum
Schwinger function methods, supplemented by results obtained from lattice
simulations.
|
[
{
"created": "Thu, 5 Jan 2023 22:06:30 GMT",
"version": "v1"
}
] |
2023-05-11
|
[
[
"Ferreira",
"M. N.",
""
],
[
"Papavassiliou",
"J.",
""
]
] |
The dynamics of the gauge sector of QCD give rise to nonperturbative phenomena that are crucial for the internal consistency of the theory; most notably, they account for the generation of a gluon mass through the action of the Schwinger mechanism, the taming of the Landau pole and the ensuing stabilization of the gauge coupling, and the infrared suppression of the three-gluon vertex. In the present work, we review some key advances in the ongoing investigation of this sector within the framework of the continuum Schwinger function methods, supplemented by results obtained from lattice simulations.
|
0905.4739
|
Christian Bauer
|
Christian W. Bauer and Bjorn O. Lange
|
Scale setting and resummation of logarithms in pp -> V + jets
|
6 pages, 9 figures
| null | null | null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
The production of vector bosons in association with jets contains at least
two unrelated scales. The first is the mass of the vector boson m_V and the
second is the hard interaction scale giving rise to large transverse momenta of
the produced jets. The production cross sections depend logarithmically on the
ratio of these scales, which can lead to a poor convergence in fixed order
perturbation theory. We illustrate how to resum all leading logarithmic terms
using effective theory methods, and show that they can be resummed by a simple
choice of the factorization scale. Implementing this scale choice we show that
the large discrepancies between next-to-leading calculations and leading order
calculations using more traditional choices of scales disappear.
|
[
{
"created": "Fri, 29 May 2009 04:49:12 GMT",
"version": "v1"
}
] |
2009-06-01
|
[
[
"Bauer",
"Christian W.",
""
],
[
"Lange",
"Bjorn O.",
""
]
] |
The production of vector bosons in association with jets contains at least two unrelated scales. The first is the mass of the vector boson m_V and the second is the hard interaction scale giving rise to large transverse momenta of the produced jets. The production cross sections depend logarithmically on the ratio of these scales, which can lead to a poor convergence in fixed order perturbation theory. We illustrate how to resum all leading logarithmic terms using effective theory methods, and show that they can be resummed by a simple choice of the factorization scale. Implementing this scale choice we show that the large discrepancies between next-to-leading calculations and leading order calculations using more traditional choices of scales disappear.
|
2007.04989
|
Peter Denton
|
Hooman Davoudiasl and Peter B. Denton and Julia Gehrlein
|
An Attractive Scenario for Light Dark Matter Direct Detection
|
6 pages, 4 figures, comments welcome; v2: 7 pages, 4 figures, model
signal improved and additional hints considered, matches published version;
v3: corrected typos in eqs. 3-4, results unchanged
|
Phys. Rev. D 102, 091701(R) (2020)
|
10.1103/PhysRevD.102.091701
| null |
hep-ph hep-ex
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Direct detection of light dark matter (DM), below the GeV scale, through
electron recoil can be efficient if DM has a velocity well above the virial
value of $v\sim 10^{-3}$. We point out that if there is a long range attractive
force sourced by bulk ordinary matter, i.e. baryons or electrons, DM can be
accelerated towards the Earth and reach velocities $v\sim 0.1$ near the Earth's
surface. In this "attractive scenario," all DM will be boosted to high
velocities by the time it reaches direct detection apparatuses in laboratories.
Furthermore, the attractive force leads to an enhanced DM number density at the
Earth facilitating DM detection even more. We elucidate the implications of
this scenario for electron recoil direct detection experiments and find
parameters that could lead to potential signals, while being consistent with
stellar cooling and other bounds. Our scenario can potentially explain the
recent excess in electron recoil signals reported by the XENON1T experiment in
the $\sim$ keV energy regime as well as the hint for non-standard stellar
cooling.
|
[
{
"created": "Thu, 9 Jul 2020 18:00:00 GMT",
"version": "v1"
},
{
"created": "Tue, 1 Dec 2020 00:20:26 GMT",
"version": "v2"
},
{
"created": "Fri, 10 Sep 2021 18:00:05 GMT",
"version": "v3"
}
] |
2021-09-14
|
[
[
"Davoudiasl",
"Hooman",
""
],
[
"Denton",
"Peter B.",
""
],
[
"Gehrlein",
"Julia",
""
]
] |
Direct detection of light dark matter (DM), below the GeV scale, through electron recoil can be efficient if DM has a velocity well above the virial value of $v\sim 10^{-3}$. We point out that if there is a long range attractive force sourced by bulk ordinary matter, i.e. baryons or electrons, DM can be accelerated towards the Earth and reach velocities $v\sim 0.1$ near the Earth's surface. In this "attractive scenario," all DM will be boosted to high velocities by the time it reaches direct detection apparatuses in laboratories. Furthermore, the attractive force leads to an enhanced DM number density at the Earth facilitating DM detection even more. We elucidate the implications of this scenario for electron recoil direct detection experiments and find parameters that could lead to potential signals, while being consistent with stellar cooling and other bounds. Our scenario can potentially explain the recent excess in electron recoil signals reported by the XENON1T experiment in the $\sim$ keV energy regime as well as the hint for non-standard stellar cooling.
|
2111.03365
|
Sourav Pal
|
Neelima Agarwal, Ayan Mukhopadhyay, Sourav Pal, and Anurag Tripathi
|
Eikonal Dressed Gluon Exponentiation to study power corrections to
Thrust, $ C $-parameter, and Angularity
|
10 Pages, Contribution to the proceedings of Radcor-Loopfest 2021
| null | null | null |
hep-ph
|
http://creativecommons.org/licenses/by/4.0/
|
Dressed Gluon Exponentiation is a well known method to study power
corrections. We present here its eikonalized version -- Eikonal Dressed Gluon
Exponentiation (EDGE) \cite{Agarwal:2020uxi} to determine the dominant power
corrections to shape variables such as Thrust, $ C $- parameter, and
Angularity. Our method remarkably simplifies the calculations.
|
[
{
"created": "Fri, 5 Nov 2021 10:10:29 GMT",
"version": "v1"
}
] |
2021-11-08
|
[
[
"Agarwal",
"Neelima",
""
],
[
"Mukhopadhyay",
"Ayan",
""
],
[
"Pal",
"Sourav",
""
],
[
"Tripathi",
"Anurag",
""
]
] |
Dressed Gluon Exponentiation is a well known method to study power corrections. We present here its eikonalized version -- Eikonal Dressed Gluon Exponentiation (EDGE) \cite{Agarwal:2020uxi} to determine the dominant power corrections to shape variables such as Thrust, $ C $- parameter, and Angularity. Our method remarkably simplifies the calculations.
|
0708.1404
|
Steen Hannestad
|
Steen Hannestad, Georg Raffelt, Yvonne Y. Y. Wong
|
Unparticle constraints from SN1987A
|
4 pages, 1 figure
|
Phys.Rev.D76:121701,2007
|
10.1103/PhysRevD.76.121701
|
MPP-2007-108
|
hep-ph astro-ph
| null |
The existence of an unparticle sector, weakly coupled to the standard model,
would have a profound impact on supernova (SN) physics. Emission of energy into
the unparticle sector from the core of SN1987A would have significantly
shortened the observed neutrino burst. The unparticle interaction with
nucleons, neutrinos, electrons and muons is constrained to be so weak that it
is unlikely to provide any missing-energy signature at colliders. One important
exception are models where scale invariance in the hidden sector is broken by
the Higgs vacuum expectation value. In this case the SN emission is suppressed
by threshold effects.
|
[
{
"created": "Fri, 10 Aug 2007 11:54:12 GMT",
"version": "v1"
}
] |
2008-11-26
|
[
[
"Hannestad",
"Steen",
""
],
[
"Raffelt",
"Georg",
""
],
[
"Wong",
"Yvonne Y. Y.",
""
]
] |
The existence of an unparticle sector, weakly coupled to the standard model, would have a profound impact on supernova (SN) physics. Emission of energy into the unparticle sector from the core of SN1987A would have significantly shortened the observed neutrino burst. The unparticle interaction with nucleons, neutrinos, electrons and muons is constrained to be so weak that it is unlikely to provide any missing-energy signature at colliders. One important exception are models where scale invariance in the hidden sector is broken by the Higgs vacuum expectation value. In this case the SN emission is suppressed by threshold effects.
|
hep-ph/0405120
|
esseur Aldo Deandrea
|
Aldo Deandrea
|
Little Higgs and precision electroweak tests
|
Talk given at 39th Rencontres de Moriond on Electroweak Interactions
and Unified Theories, La Thuile, Italy, 21-28 Mar 2004
| null | null | null |
hep-ph
| null |
I consider the low energy limit of Little Higgs models. The method consists
in eliminating the heavy fields using their classical equations of motion in
the infinite mass limit. After the elimination of the heavy degrees of freedom
one can directly read off deviations from the precision electroweak data. I
also examine the effects on the low energy precision experiments.
|
[
{
"created": "Thu, 13 May 2004 12:55:35 GMT",
"version": "v1"
},
{
"created": "Fri, 4 Jun 2004 13:28:47 GMT",
"version": "v2"
}
] |
2007-05-23
|
[
[
"Deandrea",
"Aldo",
""
]
] |
I consider the low energy limit of Little Higgs models. The method consists in eliminating the heavy fields using their classical equations of motion in the infinite mass limit. After the elimination of the heavy degrees of freedom one can directly read off deviations from the precision electroweak data. I also examine the effects on the low energy precision experiments.
|
1201.4770
|
Siannah Penaranda-Rivas
|
M. J. Herrero, S. Heinemeyer, S. Penaranda, A. M. Rodriguez-Sanchez
|
Heavy Majorana neutrino effects on MSSM-Mh
|
LaTeX, 10 pages, 3 figures. Contribution to the proceedings of the
10th International Symposium on Radiative Corrections (Applications of
Quantum Field Theory to Phenomenology) - RADCOR2011, September 26-30, 2011,
Mamallapuram, India
| null | null |
IFT-UAM/CSIC-12-06
|
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We study the effects of heavy Majorana neutrinos on the Higgs sector of the
MSSM via radiative corrections. We work within the SUSY context where the MSSM
particle content is enlarged with right handed neutrinos and their
corresponding SUSY partners, the sneutrinos, and where compatibility with
neutrino data is required. We compute the one-loop corrections to the mass of
the lightest MSSM CP-even neutral Higgs boson from Majorana neutrinos and their
SUSY partners and assume a seesaw mechanism of type I for neutrino mass
generation. A negative and sizeable Higgs mass correction of up to -5 GeV is
found for a heavy Majorana mass of up to 10^{15} GeV. This negative correction
can grow up to several tens of GeV if the soft SUSY breaking mass associated to
their sneutrino partners is simmilarly heavy as the Majorana mass.
|
[
{
"created": "Mon, 23 Jan 2012 17:04:47 GMT",
"version": "v1"
}
] |
2012-01-24
|
[
[
"Herrero",
"M. J.",
""
],
[
"Heinemeyer",
"S.",
""
],
[
"Penaranda",
"S.",
""
],
[
"Rodriguez-Sanchez",
"A. M.",
""
]
] |
We study the effects of heavy Majorana neutrinos on the Higgs sector of the MSSM via radiative corrections. We work within the SUSY context where the MSSM particle content is enlarged with right handed neutrinos and their corresponding SUSY partners, the sneutrinos, and where compatibility with neutrino data is required. We compute the one-loop corrections to the mass of the lightest MSSM CP-even neutral Higgs boson from Majorana neutrinos and their SUSY partners and assume a seesaw mechanism of type I for neutrino mass generation. A negative and sizeable Higgs mass correction of up to -5 GeV is found for a heavy Majorana mass of up to 10^{15} GeV. This negative correction can grow up to several tens of GeV if the soft SUSY breaking mass associated to their sneutrino partners is simmilarly heavy as the Majorana mass.
|
2009.00353
|
Yu-Feng Zhou
|
Chen Xia, Yan-Hao Xu, Yu-Feng Zhou
|
Constraining light dark matter upscattered by ultrahigh-energy cosmic
rays
|
25 pages, 6 figures, match the publsied version
|
Nucl.Phys.B 969 (2021) 115470
|
10.1016/j.nuclphysb.2021.115470
| null |
hep-ph astro-ph.CO
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Light halo dark matter (DM) particles upscattered by high-energy cosmic rays
(CRs) can be energetic, and become detectable by conventional direct detection
experiments. The current constraints derived from space-based direct CR
measurements can reach $\mathcal{O}(10^{-31})\text{ cm}^{2}$ for a constant
DM-nucleon scattering cross section. We show that if the CR energy spectrum
follows a power law of type $\sim E^{-3}$, the derived constraints on the
scattering cross section will be highly insensitive to DM particle mass. This
suggests that ultrahigh-energy CRs (UHECRs) indirectly measured by ground-based
detectors can be used to place constraints on ultralight DM particles, as
$E^{-3}$ is a very good approximation of the UHECR energy spectrum up to energy
$\sim10^{20}\text{ eV}$. Using the recent UHECR flux data, we show that the
current constraints derived from space-based CR measurements can in principle
be extended to ultralight DM particles far below eV scale.
|
[
{
"created": "Tue, 1 Sep 2020 11:17:16 GMT",
"version": "v1"
},
{
"created": "Mon, 28 Jun 2021 08:47:08 GMT",
"version": "v2"
},
{
"created": "Sun, 11 Jul 2021 05:06:09 GMT",
"version": "v3"
}
] |
2021-07-13
|
[
[
"Xia",
"Chen",
""
],
[
"Xu",
"Yan-Hao",
""
],
[
"Zhou",
"Yu-Feng",
""
]
] |
Light halo dark matter (DM) particles upscattered by high-energy cosmic rays (CRs) can be energetic, and become detectable by conventional direct detection experiments. The current constraints derived from space-based direct CR measurements can reach $\mathcal{O}(10^{-31})\text{ cm}^{2}$ for a constant DM-nucleon scattering cross section. We show that if the CR energy spectrum follows a power law of type $\sim E^{-3}$, the derived constraints on the scattering cross section will be highly insensitive to DM particle mass. This suggests that ultrahigh-energy CRs (UHECRs) indirectly measured by ground-based detectors can be used to place constraints on ultralight DM particles, as $E^{-3}$ is a very good approximation of the UHECR energy spectrum up to energy $\sim10^{20}\text{ eV}$. Using the recent UHECR flux data, we show that the current constraints derived from space-based CR measurements can in principle be extended to ultralight DM particles far below eV scale.
|
hep-ph/0602113
|
A. D. Polosa
|
Luciano Maiani
|
Towards a New State of Matter
|
11 pages, 10 figs, Invited Talk -- Quark Matter 2005
|
Nucl.Phys. A774 (2006) 14-24
|
10.1016/j.nuclphysa.2006.06.026
| null |
hep-ph
| null |
Progress on Quark Gluon Plasma
|
[
{
"created": "Mon, 13 Feb 2006 18:37:56 GMT",
"version": "v1"
}
] |
2009-11-11
|
[
[
"Maiani",
"Luciano",
""
]
] |
Progress on Quark Gluon Plasma
|
hep-ph/0410182
|
Thomas A. Trainor
|
T. A. Trainor, R. J. Porter and D. J. Prindle
|
Autocorrelations from fluctuation scale dependence by inversion
|
10 pages, 5 figures
|
J.Phys. G31 (2005) 809-824
|
10.1088/0954-3899/31/7/023
| null |
hep-ph
| null |
Fluctuations in nuclear collisions can be measured as a function of
momentum-space binning scale over a scale interval bounded by detector
two-track resolution and acceptance. Fluctuation scale dependence is related to
two-particle correlations by a Fredholm integral equation. That equation can be
inverted by standard numerical methods to yield an autocorrelation distribution
on difference variables as a projection of the full two-particle distribution
which retains most of the correlation information in a more compact form.
Autocorrelation distributions are typically more easily interpreted in terms of
physical mechanisms than fluctuation measurements.
|
[
{
"created": "Wed, 13 Oct 2004 16:40:29 GMT",
"version": "v1"
},
{
"created": "Thu, 14 Oct 2004 19:34:25 GMT",
"version": "v2"
},
{
"created": "Thu, 28 Apr 2005 17:15:15 GMT",
"version": "v3"
},
{
"created": "Thu, 12 May 2005 17:44:44 GMT",
"version": "v4"
}
] |
2009-11-10
|
[
[
"Trainor",
"T. A.",
""
],
[
"Porter",
"R. J.",
""
],
[
"Prindle",
"D. J.",
""
]
] |
Fluctuations in nuclear collisions can be measured as a function of momentum-space binning scale over a scale interval bounded by detector two-track resolution and acceptance. Fluctuation scale dependence is related to two-particle correlations by a Fredholm integral equation. That equation can be inverted by standard numerical methods to yield an autocorrelation distribution on difference variables as a projection of the full two-particle distribution which retains most of the correlation information in a more compact form. Autocorrelation distributions are typically more easily interpreted in terms of physical mechanisms than fluctuation measurements.
|
2407.03795
|
Huiwen Zheng
|
Hui-wen Zheng, Fei Gao, Ligong Bian, Si-xue Qin, Yu-xin Liu
|
A quantitative analysis of Gravitational Wave spectrum sourced from
First-Order Chiral Phase Transition of QCD
| null | null | null | null |
hep-ph astro-ph.CO
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We investigate the cosmological first-order chiral phase transition of QCD,
and for the first time calculate its parameters which can fully determine the
gravitational wave spectrum. With the state-of-the-art calculation from the
functional QCD method, we found that the large chemical potential of QCD phase
transition results in very weak and fast first-order phase transitions at the
temperature lower than $\mathcal{O}(10^2)$ MeV. These results further suggest
that the GW signals of NANOGrav are very unlikely sourced from the chiral phase
transition of QCD.
|
[
{
"created": "Thu, 4 Jul 2024 10:00:15 GMT",
"version": "v1"
}
] |
2024-07-08
|
[
[
"Zheng",
"Hui-wen",
""
],
[
"Gao",
"Fei",
""
],
[
"Bian",
"Ligong",
""
],
[
"Qin",
"Si-xue",
""
],
[
"Liu",
"Yu-xin",
""
]
] |
We investigate the cosmological first-order chiral phase transition of QCD, and for the first time calculate its parameters which can fully determine the gravitational wave spectrum. With the state-of-the-art calculation from the functional QCD method, we found that the large chemical potential of QCD phase transition results in very weak and fast first-order phase transitions at the temperature lower than $\mathcal{O}(10^2)$ MeV. These results further suggest that the GW signals of NANOGrav are very unlikely sourced from the chiral phase transition of QCD.
|
2311.01112
|
Muneto Nitta
|
Minoru Eto, Kentaro Nishimura, Muneto Nitta
|
Phase diagram of QCD matter with magnetic field: domain-wall Skyrmion
chain in chiral soliton lattice
|
21 pages, 2 figures, v2: references added, v3: typos corrected,
published version
|
JHEP12 (2023) 032
|
10.1007/JHEP12(2023)032
|
YGHP-23-05, KEK-TH-2573
|
hep-ph hep-th
|
http://creativecommons.org/licenses/by/4.0/
|
QCD matter in strong magnetic field exhibits a rich phase structure. In the
presence of an external magnetic field, the chiral Lagrangian for two flavors
is accompanied by the Wess-Zumino-Witten (WZW) term containing an anomalous
coupling of the neutral pion $\pi_0$ to the magnetic field via the chiral
anomaly. Due to this term, the ground state is inhomogeneous in the form of
either chiral soliton lattice (CSL), an array of solitons in the direction of
magnetic field, or domain-wall Skyrmion (DWSk) phase in which Skyrmions
supported by $\pi_3[{\rm SU}(2)] \simeq {\mathbb Z}$ appear inside the solitons
as topological lumps supported by $\pi_2(S^2) \simeq {\mathbb Z}$ in the
effective worldvolume theory of the soliton. In this paper, we determine the
phase boundary between the CSL and DWSk phases beyond the single-soliton
approximation, within the leading order of chiral perturbation theory. To this
end, we explore a domain-wall Skyrmion chain in multiple soliton
configurations. First, we construct the effective theory of the CSL by the
moduli approximation, and obtain the ${\mathbb C}P^1$ model or O(3) model,
gauged by a background electromagnetic gauge field, with two kinds of
topological terms coming from the WZW term: one is the topological lump charge
in 2+1 dimensional worldvolume and the other is a topological term counting the
soliton number. Topological lumps in the 2+1 dimensional worldvolume theory are
superconducting rings and their sizes are constrained by the flux quantization
condition. The negative energy condition of the lumps yields the phase boundary
between the CSL and DWSk phases. We find that a large region inside the CSL is
occupied by the DWSk phase, and that the CSL remains metastable in the DWSk
phase in the vicinity of the phase boundary.
|
[
{
"created": "Thu, 2 Nov 2023 09:36:42 GMT",
"version": "v1"
},
{
"created": "Tue, 14 Nov 2023 02:45:23 GMT",
"version": "v2"
},
{
"created": "Mon, 11 Dec 2023 15:56:33 GMT",
"version": "v3"
}
] |
2023-12-12
|
[
[
"Eto",
"Minoru",
""
],
[
"Nishimura",
"Kentaro",
""
],
[
"Nitta",
"Muneto",
""
]
] |
QCD matter in strong magnetic field exhibits a rich phase structure. In the presence of an external magnetic field, the chiral Lagrangian for two flavors is accompanied by the Wess-Zumino-Witten (WZW) term containing an anomalous coupling of the neutral pion $\pi_0$ to the magnetic field via the chiral anomaly. Due to this term, the ground state is inhomogeneous in the form of either chiral soliton lattice (CSL), an array of solitons in the direction of magnetic field, or domain-wall Skyrmion (DWSk) phase in which Skyrmions supported by $\pi_3[{\rm SU}(2)] \simeq {\mathbb Z}$ appear inside the solitons as topological lumps supported by $\pi_2(S^2) \simeq {\mathbb Z}$ in the effective worldvolume theory of the soliton. In this paper, we determine the phase boundary between the CSL and DWSk phases beyond the single-soliton approximation, within the leading order of chiral perturbation theory. To this end, we explore a domain-wall Skyrmion chain in multiple soliton configurations. First, we construct the effective theory of the CSL by the moduli approximation, and obtain the ${\mathbb C}P^1$ model or O(3) model, gauged by a background electromagnetic gauge field, with two kinds of topological terms coming from the WZW term: one is the topological lump charge in 2+1 dimensional worldvolume and the other is a topological term counting the soliton number. Topological lumps in the 2+1 dimensional worldvolume theory are superconducting rings and their sizes are constrained by the flux quantization condition. The negative energy condition of the lumps yields the phase boundary between the CSL and DWSk phases. We find that a large region inside the CSL is occupied by the DWSk phase, and that the CSL remains metastable in the DWSk phase in the vicinity of the phase boundary.
|
hep-ph/0411265
|
Kenneth Hicks
|
K. Hicks, V. Burkert, A.E. Kudryavtsev, I.I. Strakovsky, S. Stepanyan
|
Comment on The Evidence for a Pentaquark and Kinematic Reflections
|
Comment submitted to Phys. Rev. D (no figures)
|
Phys.Rev.D71:098501,2005
|
10.1103/PhysRevD.71.098501
| null |
hep-ph
| null |
The Regge exchange model used by Dzierba et al. is shown to be questionable,
since the pion pole term is not allowed. Hence the Regge amplitudes in their
calculation are exaggerated. The amount of kinematic reflection in the mass
spectrum of the (nK+) system, which is one decay channel of a possible
pentaquark, is not well justified in the fitting procedure used by Dzierba et
al., as shown by comparison with the (K+K-) invariant mass spectrum, which is
one decay channel of the a_2 and f_2 tensor mesons. While kinematic reflections
are still a concern in some papers that have presented evidence for the
pentaquark, better quantitative calculations are needed to demonstrate the
significance of this effect.
|
[
{
"created": "Fri, 19 Nov 2004 23:35:51 GMT",
"version": "v1"
},
{
"created": "Tue, 23 Nov 2004 21:51:56 GMT",
"version": "v2"
},
{
"created": "Mon, 13 Dec 2004 14:33:41 GMT",
"version": "v3"
}
] |
2008-11-26
|
[
[
"Hicks",
"K.",
""
],
[
"Burkert",
"V.",
""
],
[
"Kudryavtsev",
"A. E.",
""
],
[
"Strakovsky",
"I. I.",
""
],
[
"Stepanyan",
"S.",
""
]
] |
The Regge exchange model used by Dzierba et al. is shown to be questionable, since the pion pole term is not allowed. Hence the Regge amplitudes in their calculation are exaggerated. The amount of kinematic reflection in the mass spectrum of the (nK+) system, which is one decay channel of a possible pentaquark, is not well justified in the fitting procedure used by Dzierba et al., as shown by comparison with the (K+K-) invariant mass spectrum, which is one decay channel of the a_2 and f_2 tensor mesons. While kinematic reflections are still a concern in some papers that have presented evidence for the pentaquark, better quantitative calculations are needed to demonstrate the significance of this effect.
|
1405.5861
|
Walaa Eshraim
|
Walaa I. Eshraim, Francesco Giacosa, and Dirk H. Rischke
|
Phenomenology of charmed mesons in the extended Linear Sigma Model
|
19 pages, 1 figure, 3 tables
|
Eur. Phys. J. A 51 (2015) 112
|
10.1140/epja/i2015-15112-2
| null |
hep-ph nucl-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We study the so-called extended linear sigma model for the case of four quark
flavors. This model is based on global chiral symmetry and dilatation
invariance and includes, besides scalar and pseudoscalar mesons, vector and
axial-vector mesons. Most of the parameters of the model have been determined
in previous work by fitting properties of mesons with three quark flavors. Only
three new parameters, all related to the current charm quark mass, appear when
introducing charmed mesons. Surprisingly, within the accuracy expected from our
approach, the masses of open charmed mesons turn out to be in quantitative
agreement with experimental data. On the other hand, with the exception of
$J/\psi$, the masses of charmonia are underpredicted by about 10\%. It is
remarkable that our approach correctly predicts (within errors) the mass
splitting between spin-0 and spin-1 negative-parity open charm states. This
indicates that, although the charm quark mass breaks chiral symmetry quite
strongly explicitly, this symmetry still seems to have some influence on the
properties of charmed mesons.
|
[
{
"created": "Mon, 5 May 2014 15:20:26 GMT",
"version": "v1"
},
{
"created": "Tue, 22 Sep 2015 09:15:08 GMT",
"version": "v2"
}
] |
2015-09-23
|
[
[
"Eshraim",
"Walaa I.",
""
],
[
"Giacosa",
"Francesco",
""
],
[
"Rischke",
"Dirk H.",
""
]
] |
We study the so-called extended linear sigma model for the case of four quark flavors. This model is based on global chiral symmetry and dilatation invariance and includes, besides scalar and pseudoscalar mesons, vector and axial-vector mesons. Most of the parameters of the model have been determined in previous work by fitting properties of mesons with three quark flavors. Only three new parameters, all related to the current charm quark mass, appear when introducing charmed mesons. Surprisingly, within the accuracy expected from our approach, the masses of open charmed mesons turn out to be in quantitative agreement with experimental data. On the other hand, with the exception of $J/\psi$, the masses of charmonia are underpredicted by about 10\%. It is remarkable that our approach correctly predicts (within errors) the mass splitting between spin-0 and spin-1 negative-parity open charm states. This indicates that, although the charm quark mass breaks chiral symmetry quite strongly explicitly, this symmetry still seems to have some influence on the properties of charmed mesons.
|
0910.2171
|
Franz Gross
|
Franz Gross, G. Ramalho, and K. Tsushima
|
Using baryon octet magnetic moments and masses to fix the pion cloud
contribution
|
7 pages, 1 figure
|
Phys.Lett.B690:183-188,2010
|
10.1016/j.physletb.2010.05.016
|
JLAB-THY-09-1075
|
hep-ph nucl-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Using SU(3) symmetry to constrain the pion BB' couplings, assuming SU(3)
breaking comes only from one-loop pion cloud contributions, and using the the
covariant spectator theory to describe the photon coupling to the quark core,
we show how the experimental masses and magnetic moments of the baryon octet
can be used to set a model independent constraint on the strength of the pion
cloud contributions to the octet, and hence the nucleon, form factors at Q2=0.
|
[
{
"created": "Mon, 12 Oct 2009 14:44:36 GMT",
"version": "v1"
}
] |
2014-11-20
|
[
[
"Gross",
"Franz",
""
],
[
"Ramalho",
"G.",
""
],
[
"Tsushima",
"K.",
""
]
] |
Using SU(3) symmetry to constrain the pion BB' couplings, assuming SU(3) breaking comes only from one-loop pion cloud contributions, and using the the covariant spectator theory to describe the photon coupling to the quark core, we show how the experimental masses and magnetic moments of the baryon octet can be used to set a model independent constraint on the strength of the pion cloud contributions to the octet, and hence the nucleon, form factors at Q2=0.
|
hep-ph/9401269
| null |
P. Aurenche, J.-Ph. Guillet, M. Fontannaz, Y. Shimizu, J. Fujimoto, K.
Kato
|
Jets in photon-photon collisions: from TRISTAN to J/N-LC
|
14 + 10 figures included uuencoded tar-compressed
(GUILLET@FRCPN11.IN2P3.FR) , KEK-CP-11, LAPP-TH436/93
|
Prog.Theor.Phys.92:175-188,1994
|
10.1143/PTP.92.175
| null |
hep-ph
| null |
We study jet production in photon-photon reactions at the next-to-leading
logarithm accuracy. Special emphasis is placed on the discussion of the
theoretical uncertainties and on the role of the hadronic component of the
photon structure function. We also discuss subtleties in the quasi-real photon
spectrum when the photon is involved in a large transverse momentum reaction.
The phenomenology at TRISTAN energies is discussed and predictions are made for
LEP and a $1\ TeV$ \epem collider.
|
[
{
"created": "Mon, 17 Jan 1994 15:51:54 GMT",
"version": "v1"
},
{
"created": "Fri, 28 Jan 1994 17:40:48 GMT",
"version": "v2"
}
] |
2011-07-19
|
[
[
"Aurenche",
"P.",
""
],
[
"Guillet",
"J. -Ph.",
""
],
[
"Fontannaz",
"M.",
""
],
[
"Shimizu",
"Y.",
""
],
[
"Fujimoto",
"J.",
""
],
[
"Kato",
"K.",
""
]
] |
We study jet production in photon-photon reactions at the next-to-leading logarithm accuracy. Special emphasis is placed on the discussion of the theoretical uncertainties and on the role of the hadronic component of the photon structure function. We also discuss subtleties in the quasi-real photon spectrum when the photon is involved in a large transverse momentum reaction. The phenomenology at TRISTAN energies is discussed and predictions are made for LEP and a $1\ TeV$ \epem collider.
|
hep-ph/9809406
|
Keith Dienes
|
Keith R. Dienes, Emilian Dudas, Tony Gherghetta, Antonio Riotto
|
Cosmological Phase Transitions and Radius Stabilization in Higher
Dimensions
|
37 pages, LaTeX, 5 figures
|
Nucl.Phys. B543 (1999) 387-422
|
10.1016/S0550-3213(98)00855-4
|
CERN-TH/98-259 (September 1998)
|
hep-ph astro-ph hep-th
| null |
Recently there has been considerable interest in field theories and string
theories with large extra spacetime dimensions. In this paper, we explore the
role of such extra dimensions for cosmology, focusing on cosmological phase
transitions in field theory and the Hagedorn transition and radius
stabilization in string theory. In each case, we find that significant
distinctions emerge from the usual case in which such large extra dimensions
are absent. For example, for temperatures larger than the scale of the
compactification radii, we show that the critical temperature above which
symmetry restoration occurs is reduced relative to the usual four-dimensional
case, and consequently cosmological phase transitions in extra dimensions are
delayed. Furthermore, we argue that if phase transitions do occur at
temperatures larger than the compactification scale, then they cannot be of
first-order type. Extending our analysis to string theories with large internal
dimensions, we focus on the Hagedorn transition and the new features that arise
due to the presence of large internal dimensions. We also consider the role of
thermal effects in establishing a potential for the radius of the compactified
dimension, and we use this to propose a thermal mechanism for generating and
stabilizing a large radius of compactification.
|
[
{
"created": "Tue, 15 Sep 1998 22:13:05 GMT",
"version": "v1"
}
] |
2009-10-31
|
[
[
"Dienes",
"Keith R.",
""
],
[
"Dudas",
"Emilian",
""
],
[
"Gherghetta",
"Tony",
""
],
[
"Riotto",
"Antonio",
""
]
] |
Recently there has been considerable interest in field theories and string theories with large extra spacetime dimensions. In this paper, we explore the role of such extra dimensions for cosmology, focusing on cosmological phase transitions in field theory and the Hagedorn transition and radius stabilization in string theory. In each case, we find that significant distinctions emerge from the usual case in which such large extra dimensions are absent. For example, for temperatures larger than the scale of the compactification radii, we show that the critical temperature above which symmetry restoration occurs is reduced relative to the usual four-dimensional case, and consequently cosmological phase transitions in extra dimensions are delayed. Furthermore, we argue that if phase transitions do occur at temperatures larger than the compactification scale, then they cannot be of first-order type. Extending our analysis to string theories with large internal dimensions, we focus on the Hagedorn transition and the new features that arise due to the presence of large internal dimensions. We also consider the role of thermal effects in establishing a potential for the radius of the compactified dimension, and we use this to propose a thermal mechanism for generating and stabilizing a large radius of compactification.
|
hep-ph/0004050
|
Asko Jokinen
|
K. Enqvist, A. Jokinen, J. McDonald
|
Flat direction condensate instabilities in the MSSM
|
9 pages, 9 encapsulated postscript figures
|
Phys.Lett. B483 (2000) 191-195
|
10.1016/S0370-2693(00)00578-5
| null |
hep-ph
| null |
Coherently oscillating scalar condensates formed along flat directions of the
MSSM scalar potential are unstable with respect to spatial perturbations if the
potential is flatter than phi^2, resulting in the formation of non-topological
solitons such as Q-balls. Using renormalization group we calculate the
corrections to the phi^2 potential for a range of flat directions and show that
unstable condensates are a generic feature of the MSSM. Exceptions arise for an
experimentally testable range of stop and gluino masses when there are large
admixtures of stops in the flat direction scalar.
|
[
{
"created": "Thu, 6 Apr 2000 10:18:18 GMT",
"version": "v1"
}
] |
2009-10-31
|
[
[
"Enqvist",
"K.",
""
],
[
"Jokinen",
"A.",
""
],
[
"McDonald",
"J.",
""
]
] |
Coherently oscillating scalar condensates formed along flat directions of the MSSM scalar potential are unstable with respect to spatial perturbations if the potential is flatter than phi^2, resulting in the formation of non-topological solitons such as Q-balls. Using renormalization group we calculate the corrections to the phi^2 potential for a range of flat directions and show that unstable condensates are a generic feature of the MSSM. Exceptions arise for an experimentally testable range of stop and gluino masses when there are large admixtures of stops in the flat direction scalar.
|
1911.00367
|
Alex Keshavarzi
|
Alexander Keshavarzi, Daisuke Nomura and Thomas Teubner
|
The $g-2$ of charged leptons, $\alpha(M_Z^2)$ and the hyperfine
splitting of muonium
|
25 pages, 9 figures
|
Phys. Rev. D 101, 014029 (2020)
|
10.1103/PhysRevD.101.014029
|
MAN/HEP/2019/010, LTH 1216, KEK-TH-2165
|
hep-ph hep-ex
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Following updates in the compilation of $e^+e^-\rightarrow{\rm
hadrons}$ data, this work presents re-evaluations of the hadronic vacuum
polarisation contributions to the anomalous magnetic moment of the electron
($a_e$), muon ($a_\mu$) and tau lepton ($a_\tau$), to the ground-state
hyperfine splitting of muonium and also updates the hadronic contributions to
the running of the QED coupling at the mass scale of the $Z$ boson,
$\alpha(M_Z^2)$. Combining the results for the hadronic vacuum polarisation
contributions with recent updates for the hadronic light-by-light corrections,
the electromagnetic and the weak contributions, the deviation between the
measured value of $a_\mu$ and its Standard Model prediction amounts to $\Delta
a_{\mu} = (28.02 \pm 7.37) \times 10^{-10}$, corresponding to a muon $g-2$
discrepancy of $3.8\sigma$.
|
[
{
"created": "Fri, 1 Nov 2019 13:30:06 GMT",
"version": "v1"
},
{
"created": "Wed, 29 Jan 2020 20:58:33 GMT",
"version": "v2"
}
] |
2020-02-05
|
[
[
"Keshavarzi",
"Alexander",
""
],
[
"Nomura",
"Daisuke",
""
],
[
"Teubner",
"Thomas",
""
]
] |
Following updates in the compilation of $e^+e^-\rightarrow{\rm hadrons}$ data, this work presents re-evaluations of the hadronic vacuum polarisation contributions to the anomalous magnetic moment of the electron ($a_e$), muon ($a_\mu$) and tau lepton ($a_\tau$), to the ground-state hyperfine splitting of muonium and also updates the hadronic contributions to the running of the QED coupling at the mass scale of the $Z$ boson, $\alpha(M_Z^2)$. Combining the results for the hadronic vacuum polarisation contributions with recent updates for the hadronic light-by-light corrections, the electromagnetic and the weak contributions, the deviation between the measured value of $a_\mu$ and its Standard Model prediction amounts to $\Delta a_{\mu} = (28.02 \pm 7.37) \times 10^{-10}$, corresponding to a muon $g-2$ discrepancy of $3.8\sigma$.
|
1809.09023
|
Yu Jia
|
Yingsheng Huang, Yu Jia, and Rui Yu
|
Deciphering the coalescence behavior of Coulomb-Schr\"odinger atomic
wave functions from operator product expansion
|
v2, 5 pages, 3 figures. Typos corrected, text refined
| null | null | null |
hep-ph nucl-th physics.atom-ph physics.chem-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We revisit the coalescence behavior of the atomic Schr\"odinger wave
functions from the angle of operator product expansion (OPE) within the
nonrelativistic Coulomb-Schr\"odinger effective field theory. We take the
electron-nucleus coalescence as an explicit example to demonstrate our
formalism, where the celebrated Kato's cusp condition can be easily reproduced.
An exact OPE relation is rigorously proved to all orders in perturbation
theory. Our approach can be readily extended to ascertain the multi-particle
coalescence behaviors of atomic wave functions, as well as to take relativistic
effects into account.
|
[
{
"created": "Mon, 24 Sep 2018 15:59:58 GMT",
"version": "v1"
},
{
"created": "Tue, 16 Oct 2018 17:50:57 GMT",
"version": "v2"
}
] |
2018-10-17
|
[
[
"Huang",
"Yingsheng",
""
],
[
"Jia",
"Yu",
""
],
[
"Yu",
"Rui",
""
]
] |
We revisit the coalescence behavior of the atomic Schr\"odinger wave functions from the angle of operator product expansion (OPE) within the nonrelativistic Coulomb-Schr\"odinger effective field theory. We take the electron-nucleus coalescence as an explicit example to demonstrate our formalism, where the celebrated Kato's cusp condition can be easily reproduced. An exact OPE relation is rigorously proved to all orders in perturbation theory. Our approach can be readily extended to ascertain the multi-particle coalescence behaviors of atomic wave functions, as well as to take relativistic effects into account.
|
hep-ph/0112086
|
Andre Sopczak
|
Andre Sopczak (Lancaster University)
|
MSSM Constraints from Higgs Boson Searches
|
7 pages, 21 figures
|
Nucl.Phys.Proc.Suppl. 109B (2002) 271-277
|
10.1016/S0920-5632(02)90044-7
| null |
hep-ph
| null |
The LEP era has brought immense progress in searches for Higgs bosons over
the last 12 years which will guide searches at future colliders. The evolution
of the Higgs boson mass limits are reviewed with the focus on results from
general parameter scans in the Minimal Supersymmetric extension of the Standard
Model (MSSM) in contrast to the so-called benchmark limits. The hint for a
Standard Model (SM) Higgs boson of 115.6 GeV can also be interpreted as a
preference for a Higgs boson of that mass in the MSSM. Further small data
excesses allow the hypothesis that the neutral Higgs bosons of the MSSM all
have masses between 90 and 116 GeV.
|
[
{
"created": "Wed, 5 Dec 2001 18:16:34 GMT",
"version": "v1"
}
] |
2015-06-25
|
[
[
"Sopczak",
"Andre",
"",
"Lancaster University"
]
] |
The LEP era has brought immense progress in searches for Higgs bosons over the last 12 years which will guide searches at future colliders. The evolution of the Higgs boson mass limits are reviewed with the focus on results from general parameter scans in the Minimal Supersymmetric extension of the Standard Model (MSSM) in contrast to the so-called benchmark limits. The hint for a Standard Model (SM) Higgs boson of 115.6 GeV can also be interpreted as a preference for a Higgs boson of that mass in the MSSM. Further small data excesses allow the hypothesis that the neutral Higgs bosons of the MSSM all have masses between 90 and 116 GeV.
|
hep-ph/0009107
|
Alexei A. Pivovarov
|
A.A. Pivovarov
|
High order PT calculations for heavy quarks near threshold
|
14 pages, latex, 1 figure. Talk given at Research Workshop
``Calculations for Modern and Future Colliders'', JINR, Dubna, Russia, July
9-23, 2000
| null | null |
MZ-TH/00-40
|
hep-ph hep-ex
| null |
Results of analytical calculations for heavy quark systems in higher orders
of perturbation theory are overviewed. I discuss baryons with one finite mass
quark in the next-to-leading order and heavy quark pair production near the
threshold within NRQCD.
|
[
{
"created": "Sun, 10 Sep 2000 09:32:19 GMT",
"version": "v1"
}
] |
2007-05-23
|
[
[
"Pivovarov",
"A. A.",
""
]
] |
Results of analytical calculations for heavy quark systems in higher orders of perturbation theory are overviewed. I discuss baryons with one finite mass quark in the next-to-leading order and heavy quark pair production near the threshold within NRQCD.
|
hep-ph/9811244
| null |
L. E. Gordon (Jefferson Lab and Hampton University)
|
Nucleon Spin Structure and Large $p_T$ Processes at $pp$ Colliders
|
Talk presented at SPIN98 symposium, Protvino, Russia, September 8-12,
1998. 2 pages, 3 figures. Uses epsf
| null | null | null |
hep-ph
| null |
QCD motivated polarized parton distributions, evolved directly in $x$-space,
are used to predict rates for prompt photon production at RHIC centre of mass
energies. Various scenarios for the polarized gluon distributions are
considered and compared, and the possibility of using large $p_T$ processes in
polarized $pp$ collision experiments to choose between them is analyzed.
|
[
{
"created": "Wed, 4 Nov 1998 17:55:14 GMT",
"version": "v1"
}
] |
2009-09-25
|
[
[
"Gordon",
"L. E.",
"",
"Jefferson Lab and Hampton University"
]
] |
QCD motivated polarized parton distributions, evolved directly in $x$-space, are used to predict rates for prompt photon production at RHIC centre of mass energies. Various scenarios for the polarized gluon distributions are considered and compared, and the possibility of using large $p_T$ processes in polarized $pp$ collision experiments to choose between them is analyzed.
|
hep-ph/0004206
|
Igor Ivanov
|
I. P. Ivanov, N. N. Nikolaev
|
Anatomy of the differential gluon structure function of the proton from
the experimental data on F_2p
|
37 pages, 25 figures
|
Phys.Rev.D65:054004,2002
|
10.1103/PhysRevD.65.054004
|
FZJ-IKP(Th)-2000/08
|
hep-ph
| null |
The use of the differential gluon structure function of the proton ${\cal
F}(x,Q^{2})$ introduced by Fadin, Kuraev and Lipatov in 1975 is called upon in
many applications of small-x QCD. We report here the first determination of
${\cal F}(x,Q^{2})$ from the experimental data on the small-x proton structure
function $F_{2p}(x,Q^{2})$. We give convenient parameterizations for ${\cal
F}(x,Q^{2})$ based partly on the available DGLAP evolution fits (GRV, CTEQ &
MRS) to parton distribution functions and on realistic extrapolations into soft
region. We discuss an impact of soft gluons on various observables. The
x-dependence of the so-determined ${\cal F}(x,Q^{2})$ varies strongly with Q^2
and does not exhibit simple Regge properties. None the less the hard-to-soft
diffusion is found to give rise to a viable approximation of the proton
structure function F_{2p}(x,Q^2) by the soft and hard Regge components with
intercepts \Delta_{soft}=0 and \Delta_{hard}\sim 0.4.
|
[
{
"created": "Fri, 21 Apr 2000 15:45:49 GMT",
"version": "v1"
}
] |
2014-11-17
|
[
[
"Ivanov",
"I. P.",
""
],
[
"Nikolaev",
"N. N.",
""
]
] |
The use of the differential gluon structure function of the proton ${\cal F}(x,Q^{2})$ introduced by Fadin, Kuraev and Lipatov in 1975 is called upon in many applications of small-x QCD. We report here the first determination of ${\cal F}(x,Q^{2})$ from the experimental data on the small-x proton structure function $F_{2p}(x,Q^{2})$. We give convenient parameterizations for ${\cal F}(x,Q^{2})$ based partly on the available DGLAP evolution fits (GRV, CTEQ & MRS) to parton distribution functions and on realistic extrapolations into soft region. We discuss an impact of soft gluons on various observables. The x-dependence of the so-determined ${\cal F}(x,Q^{2})$ varies strongly with Q^2 and does not exhibit simple Regge properties. None the less the hard-to-soft diffusion is found to give rise to a viable approximation of the proton structure function F_{2p}(x,Q^2) by the soft and hard Regge components with intercepts \Delta_{soft}=0 and \Delta_{hard}\sim 0.4.
|
2201.04319
|
Matthias Lutz F.M.
|
Yonggoo Heo, C. Kobdaj and Matthias F.M. Lutz
|
The chiral Lagrangian with three flavors and large-Nc sum rules
|
22 pages
| null |
10.1140/epja/s10050-022-00905-5
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We reconsider the chiral Lagrangian with three-flavor baryon fields. A
systematic analysis of all LEC that contribute to the axial-vector and
pseudoscalar currents in the baryon octet and decuplet fields at
next-to-leading order is performed. While there are 4 LEC relevant at leading
order, the number of relevant LEC at subleading chiral order is 23. For those a
leading order large-$N_c$ analysis predicts 3 and 18 sum rules respectively. At
the next accuracy level the number of sum rules is reduced to 2 and 8. Our
results are illustrated by a tree-level analysis of available axial-vector
coupling constants and strong decay widths of the baryon decuplet states.
|
[
{
"created": "Wed, 12 Jan 2022 05:58:17 GMT",
"version": "v1"
}
] |
2023-01-18
|
[
[
"Heo",
"Yonggoo",
""
],
[
"Kobdaj",
"C.",
""
],
[
"Lutz",
"Matthias F. M.",
""
]
] |
We reconsider the chiral Lagrangian with three-flavor baryon fields. A systematic analysis of all LEC that contribute to the axial-vector and pseudoscalar currents in the baryon octet and decuplet fields at next-to-leading order is performed. While there are 4 LEC relevant at leading order, the number of relevant LEC at subleading chiral order is 23. For those a leading order large-$N_c$ analysis predicts 3 and 18 sum rules respectively. At the next accuracy level the number of sum rules is reduced to 2 and 8. Our results are illustrated by a tree-level analysis of available axial-vector coupling constants and strong decay widths of the baryon decuplet states.
|
1807.08697
|
Renaud Boussarie
|
Renaud Boussarie, Yoshitaka Hatta, Bo-Wen Xiao, Feng Yuan
|
Probing the Weizs\"acker-Williams gluon Wigner distribution in pp
collisions
|
19 pages, 3 figures
|
Phys. Rev. D 98, 074015 (2018)
|
10.1103/PhysRevD.98.074015
|
YITP-18-67
|
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We show that the diffractive forward production of two quarkonia, especially
the $\chi_{cJ}$ and $\eta_c$ states, in proton-proton or proton-ion collisions
can access the Weizs\"acker-Williams gluon Wigner distribution of the proton.
We use the hybrid factorization approach where the collinear, double gluon PDF
is applied for one of the protons and the $k_T$-dependent (Wigner or GTMD)
distribution for the other. The production of quarkonia is treated in the NRQCD
framework. A particularly concise formula is obtained for double $\chi_{J=1}$
production.
|
[
{
"created": "Mon, 23 Jul 2018 16:14:09 GMT",
"version": "v1"
}
] |
2018-10-24
|
[
[
"Boussarie",
"Renaud",
""
],
[
"Hatta",
"Yoshitaka",
""
],
[
"Xiao",
"Bo-Wen",
""
],
[
"Yuan",
"Feng",
""
]
] |
We show that the diffractive forward production of two quarkonia, especially the $\chi_{cJ}$ and $\eta_c$ states, in proton-proton or proton-ion collisions can access the Weizs\"acker-Williams gluon Wigner distribution of the proton. We use the hybrid factorization approach where the collinear, double gluon PDF is applied for one of the protons and the $k_T$-dependent (Wigner or GTMD) distribution for the other. The production of quarkonia is treated in the NRQCD framework. A particularly concise formula is obtained for double $\chi_{J=1}$ production.
|
hep-ph/0703056
|
Aaron Pierce
|
Aaron Pierce and Jesse Thaler
|
Natural Dark Matter from an Unnatural Higgs Boson and New Colored
Particles at the TeV Scale
|
1+22 pages, 5 figures. Added references. Minor clarifications
|
JHEP 0708:026,2007
|
10.1088/1126-6708/2007/08/026
|
MCTP-07-11
|
hep-ph
| null |
The thermal relic abundance of Dark Matter motivates the existence of new
electroweak scale particles, independent of naturalness considerations.
However, most unnatural Dark Matter models do not ensure the presence of new
particles charged under SU(3)_C, resulting in challenging LHC phenomenology.
Here, we present a class of models with scalar electroweak doublet Dark Matter
that require a host of colored particles at the TeV scale. In these models, the
Higgs boson is apparently fine-tuned, but the Dark Matter doublet is kept light
without any additional fine-tuning.
|
[
{
"created": "Mon, 5 Mar 2007 21:08:05 GMT",
"version": "v1"
},
{
"created": "Fri, 11 May 2007 20:35:15 GMT",
"version": "v2"
}
] |
2009-01-06
|
[
[
"Pierce",
"Aaron",
""
],
[
"Thaler",
"Jesse",
""
]
] |
The thermal relic abundance of Dark Matter motivates the existence of new electroweak scale particles, independent of naturalness considerations. However, most unnatural Dark Matter models do not ensure the presence of new particles charged under SU(3)_C, resulting in challenging LHC phenomenology. Here, we present a class of models with scalar electroweak doublet Dark Matter that require a host of colored particles at the TeV scale. In these models, the Higgs boson is apparently fine-tuned, but the Dark Matter doublet is kept light without any additional fine-tuning.
|
1910.13474
|
Matthias K\"onig
|
Javier Fuentes-Martin, Gino Isidori, Matthias K\"onig, Nudzeim
Selimovic
|
Vector Leptoquarks Beyond Tree Level
|
5 pages, 1 figure
|
Phys. Rev. D 101, 035024 (2020)
|
10.1103/PhysRevD.101.035024
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Models with massive vector leptoquarks, resulting from an $SU(4)$ gauge
symmetry spontaneously broken at the TeV scale, are of great phenomenological
interest given the current "anomalies" in semileptonic $B$ decays. We analyze
the relations between low- and high-energy observables in such class of models
to next-to-leading order accuracy in the $SU(4)$ gauge coupling $g_4$. For
large values of $g_4$, motivated by recent $B$-physics data, one-loop
corrections are sizeable. The main effect is an enhanced contribution at
low-energy, at fixed on-shell couplings. This result has important implications
for current and future high-energy searches of vector leptoquark models.
|
[
{
"created": "Tue, 29 Oct 2019 18:32:58 GMT",
"version": "v1"
}
] |
2020-02-26
|
[
[
"Fuentes-Martin",
"Javier",
""
],
[
"Isidori",
"Gino",
""
],
[
"König",
"Matthias",
""
],
[
"Selimovic",
"Nudzeim",
""
]
] |
Models with massive vector leptoquarks, resulting from an $SU(4)$ gauge symmetry spontaneously broken at the TeV scale, are of great phenomenological interest given the current "anomalies" in semileptonic $B$ decays. We analyze the relations between low- and high-energy observables in such class of models to next-to-leading order accuracy in the $SU(4)$ gauge coupling $g_4$. For large values of $g_4$, motivated by recent $B$-physics data, one-loop corrections are sizeable. The main effect is an enhanced contribution at low-energy, at fixed on-shell couplings. This result has important implications for current and future high-energy searches of vector leptoquark models.
|
1905.02478
|
Shigehiro Yasui
|
Shigehiro Yasui, Tomokazu Miyamoto
|
Spin-isospin Kondo effects for $\Sigma_{c}$ and $\Sigma_{c}^{\ast}$
baryons and $\bar{D}$ and $\bar{D}^{\ast}$ mesons
|
28 pages, 7 figures
|
Phys. Rev. C 100, 045201 (2019)
|
10.1103/PhysRevC.100.045201
| null |
hep-ph cond-mat.str-el nucl-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We study the Kondo effect for a $\Sigma_{c}$ ($\Sigma_{c}^{\ast}$) baryon in
nuclear matter. In terms of the spin and isospin
($\mathrm{SU}(2)_{\mathrm{spin}} \times \mathrm{SU}(2)_{\mathrm{isospin}}$)
symmetry, the heavy-quark spin symmetry and the S-wave interaction, we provide
the general form of the Lagrangian for a $\Sigma_{c}$ ($\Sigma_{c}^{\ast}$)
baryon and a nucleon. We analyze the renormalization equation at the one-loop
level, and find that the coexistence of spin exchange and isospin exchange
magnifies the Kondo effect in comparison with the case where the spin-exchange
interaction and the isospin-exchange interaction exist separately. We
demonstrate that the solution exists for the ideal sets of the coupling
constants, including the $\mathrm{SU}(4)$ symmetry as an extension of the
$\mathrm{SU}(2)_{\mathrm{spin}} \times \mathrm{SU}(2)_{\mathrm{isospin}}$
symmetry. We also conduct a similar analysis for the Kondo effect of a
$\bar{D}$ ($\bar{D}^{\ast}$) meson in nuclear matter. On the basis of the
obtained result, we conjecture that there could exist a "mapping" from the
heavy meson (baryon) in vacuum onto the heavy baryon (meson) in nuclear matter.
|
[
{
"created": "Tue, 7 May 2019 11:37:01 GMT",
"version": "v1"
},
{
"created": "Mon, 21 Oct 2019 11:12:51 GMT",
"version": "v2"
}
] |
2019-10-22
|
[
[
"Yasui",
"Shigehiro",
""
],
[
"Miyamoto",
"Tomokazu",
""
]
] |
We study the Kondo effect for a $\Sigma_{c}$ ($\Sigma_{c}^{\ast}$) baryon in nuclear matter. In terms of the spin and isospin ($\mathrm{SU}(2)_{\mathrm{spin}} \times \mathrm{SU}(2)_{\mathrm{isospin}}$) symmetry, the heavy-quark spin symmetry and the S-wave interaction, we provide the general form of the Lagrangian for a $\Sigma_{c}$ ($\Sigma_{c}^{\ast}$) baryon and a nucleon. We analyze the renormalization equation at the one-loop level, and find that the coexistence of spin exchange and isospin exchange magnifies the Kondo effect in comparison with the case where the spin-exchange interaction and the isospin-exchange interaction exist separately. We demonstrate that the solution exists for the ideal sets of the coupling constants, including the $\mathrm{SU}(4)$ symmetry as an extension of the $\mathrm{SU}(2)_{\mathrm{spin}} \times \mathrm{SU}(2)_{\mathrm{isospin}}$ symmetry. We also conduct a similar analysis for the Kondo effect of a $\bar{D}$ ($\bar{D}^{\ast}$) meson in nuclear matter. On the basis of the obtained result, we conjecture that there could exist a "mapping" from the heavy meson (baryon) in vacuum onto the heavy baryon (meson) in nuclear matter.
|
2004.03221
|
Kai-Lei Wang
|
Kai-Lei Wang, Li-Ye Xiao, and Xian-Hui Zhong
|
Understanding the newly observed $\Xi_c^0$ states through their decays
|
7 pages,2 figures
|
Phys. Rev. D 102, 034029 (2020)
|
10.1103/PhysRevD.102.034029
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Inspired by the newly observed $\Xi_c^0$ states by the LHCb Collaboration, we
investigate the OZI-allowed two-body strong decays of the $\lambda$-mode $1P$
wave $\Xi'_c$ states within the chiral quark model. Our results indicate that:
(i) the newly observed states $\Xi_c(2923)^0$ and $\Xi_c(2939)^0$ are good
candidates of the $\lambda$-mode $1P$ wave $\Xi'_c$ states with the spin-parity
$J^P=3/2^-$, namely $|^4P_{\lambda}3/2^-\rangle$ and
$|^2P_{\lambda}3/2^-\rangle$, respectively. (ii) The another newly observed
state $\Xi_c(2965)^0$ mostly corresponds to the $\lambda$-mode $1P$-wave
$\Xi'_c$ state with the spin-parity $J^P=5/2^-$, namely
$|^4P_{\lambda}5/2^-\rangle$. (iii) For the two $\lambda$-mode $J^P=1/2^-$
mixed states, the $|P_{\lambda}~1/2^-\rangle_1$ is a narrow state with a width
of $\Gamma\sim15$ MeV and mainly decays into $\Xi'_c\pi$; while the
$|P_{\lambda}~1/2^-\rangle_2$ state has a width of $\Gamma\sim52$ MeV and
dominantly decays into $\Xi_c\pi$ and $\Lambda_cK$ channels. If the broad
structure around $2880$ MeV observed at LHCb arises from the new $\Xi^0_c$
state, this state is very likely to be the $|P_{\lambda}~1/2^-\rangle_2$ state.
|
[
{
"created": "Tue, 7 Apr 2020 09:24:13 GMT",
"version": "v1"
},
{
"created": "Mon, 20 Apr 2020 14:47:37 GMT",
"version": "v2"
},
{
"created": "Tue, 21 Apr 2020 20:04:07 GMT",
"version": "v3"
}
] |
2020-09-02
|
[
[
"Wang",
"Kai-Lei",
""
],
[
"Xiao",
"Li-Ye",
""
],
[
"Zhong",
"Xian-Hui",
""
]
] |
Inspired by the newly observed $\Xi_c^0$ states by the LHCb Collaboration, we investigate the OZI-allowed two-body strong decays of the $\lambda$-mode $1P$ wave $\Xi'_c$ states within the chiral quark model. Our results indicate that: (i) the newly observed states $\Xi_c(2923)^0$ and $\Xi_c(2939)^0$ are good candidates of the $\lambda$-mode $1P$ wave $\Xi'_c$ states with the spin-parity $J^P=3/2^-$, namely $|^4P_{\lambda}3/2^-\rangle$ and $|^2P_{\lambda}3/2^-\rangle$, respectively. (ii) The another newly observed state $\Xi_c(2965)^0$ mostly corresponds to the $\lambda$-mode $1P$-wave $\Xi'_c$ state with the spin-parity $J^P=5/2^-$, namely $|^4P_{\lambda}5/2^-\rangle$. (iii) For the two $\lambda$-mode $J^P=1/2^-$ mixed states, the $|P_{\lambda}~1/2^-\rangle_1$ is a narrow state with a width of $\Gamma\sim15$ MeV and mainly decays into $\Xi'_c\pi$; while the $|P_{\lambda}~1/2^-\rangle_2$ state has a width of $\Gamma\sim52$ MeV and dominantly decays into $\Xi_c\pi$ and $\Lambda_cK$ channels. If the broad structure around $2880$ MeV observed at LHCb arises from the new $\Xi^0_c$ state, this state is very likely to be the $|P_{\lambda}~1/2^-\rangle_2$ state.
|
2403.07327
|
Xuangong Wang
|
X. G. Wang, A. W. Thomas
|
Challenges in the extraction of physics beyond the Standard Model from
electron scattering
|
5 pages, 3 figures
| null | null |
ADP-24-05/T1244
|
hep-ph hep-ex nucl-ex
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Precise measurements of electron and positron scattering, including parity
violation, offer great promise in the search for physics beyond the Standard
Model. In this context it is crucial to understand the corrections which might
arise from charge symmetry violation, as well as the less well known strange
and charm quark distributions. Our analysis, using state of the art parton
distributions, suggests that these contributions lead to corrections in the
extraction of the weak couplings $g^{eq}_{AV}$ and $g^{eq}_{VA}$ of the order
$(1-2)\%$, while they are as large as $4\%$ for $g^{eq}_{AA}$, at a typical
scale of $Q^2 = 10\ {\rm GeV}^2$. These results underline the importance of
carrying out high precision measurements, which will not only provide
information on physics beyond the Standard Model but also reduce the current
uncertainties on our knowledge of the strange and charm quark distributions in
the proton.
|
[
{
"created": "Tue, 12 Mar 2024 05:22:40 GMT",
"version": "v1"
}
] |
2024-03-13
|
[
[
"Wang",
"X. G.",
""
],
[
"Thomas",
"A. W.",
""
]
] |
Precise measurements of electron and positron scattering, including parity violation, offer great promise in the search for physics beyond the Standard Model. In this context it is crucial to understand the corrections which might arise from charge symmetry violation, as well as the less well known strange and charm quark distributions. Our analysis, using state of the art parton distributions, suggests that these contributions lead to corrections in the extraction of the weak couplings $g^{eq}_{AV}$ and $g^{eq}_{VA}$ of the order $(1-2)\%$, while they are as large as $4\%$ for $g^{eq}_{AA}$, at a typical scale of $Q^2 = 10\ {\rm GeV}^2$. These results underline the importance of carrying out high precision measurements, which will not only provide information on physics beyond the Standard Model but also reduce the current uncertainties on our knowledge of the strange and charm quark distributions in the proton.
|
1011.3613
|
Zhanwei Liu
|
Zhan-Wei Liu, Yan-Rui Liu, Shi-Lin Zhu
|
Pseudoscalar Meson and Decuplet Baryon Scattering Lengths
|
14 pages, 1 figures, 9 tables
|
Phys.Rev.D83:034004,2011
|
10.1103/PhysRevD.83.034004
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We have systematically calculated the S-wave pseudoscalar meson and decuplet
baryon scattering lengths to the third order in the small scale expansion
scheme of the heavy baryon chiral perturbation theory. We hope the future study
may test the framework and the present predictions.
|
[
{
"created": "Tue, 16 Nov 2010 09:04:45 GMT",
"version": "v1"
},
{
"created": "Mon, 14 Feb 2011 10:55:30 GMT",
"version": "v2"
}
] |
2011-02-18
|
[
[
"Liu",
"Zhan-Wei",
""
],
[
"Liu",
"Yan-Rui",
""
],
[
"Zhu",
"Shi-Lin",
""
]
] |
We have systematically calculated the S-wave pseudoscalar meson and decuplet baryon scattering lengths to the third order in the small scale expansion scheme of the heavy baryon chiral perturbation theory. We hope the future study may test the framework and the present predictions.
|
hep-ph/0703150
|
Jean-Paul Blaizot
|
Jean-Paul Blaizot
|
Theoretical overview: towards understanding the quark-gluon plasma
|
10 pages. Plenary talk at the 19th International Conference on
Ultra-Relativistic Nucleus-Nucleus Collisions (QM2006) held in Shanghai,
China on November 14-20, 2006
|
J.Phys.G34:S243-252,2007
|
10.1088/0954-3899/34/8/S09
|
ECT*-07-05
|
hep-ph
| null |
I give a brief overview of recent theoretical developments concerning the
high temperature phase of QCD, and the structure of hadronic wave functions at
high energy.
|
[
{
"created": "Wed, 14 Mar 2007 10:31:03 GMT",
"version": "v1"
}
] |
2008-11-26
|
[
[
"Blaizot",
"Jean-Paul",
""
]
] |
I give a brief overview of recent theoretical developments concerning the high temperature phase of QCD, and the structure of hadronic wave functions at high energy.
|
2209.07426
|
Tien-Tien Yu
|
Jodi Cooley, Tongyan Lin, W. Hugh Lippincott, Tracy R. Slatyer,
Tien-Tien Yu, Daniel S. Akerib, Tsuguo Aramaki, Daniel Baxter, Torsten
Bringmann, Ray Bunker, Daniel Carney, Susana Cebri\'an, Thomas Y. Chen,
Priscilla Cushman, C.E. Dahl, Rouven Essig, Alden Fan, Richard Gaitskell,
Cristano Galbiati, Graciela B. Gelmini, Graham K. Giovanetti, Guillaume
Giroux, Luca Grandi, J. Patrick Harding, Scott Haselschwardt, Lauren Hsu,
Shunsaku Horiuchi, Yonatan Kahn, Doojin Kim, Geon-Bo Kim, Scott Kravitz, V.
A. Kudryavtsev, Noah Kurinsky, Rafael F. Lang, Rebecca K. Leane, Benjamin V.
Lehmann, Cecilia Levy, Shengchao Li, Ben Loer, Aaron Manalaysay, C. J
Martoff, Gopolang Mohlabeng, M.E. Monzani, Alexander St J. Murphy, Russell
Neilson, Harry N. Nelson, Ciaran A. J. O'Hare, K.J. Palladino, Aditya Parikh,
Jong-Chul Park, Kerstin Perez, Stefano Profumo, Nirmal Raj, Brandon M. Roach,
Tarek Saab, Maria Lu\'isa Sarsa, Richard Schnee, Sally Shaw, Seodong Shin,
Kuver Sinha, Kelly Stifter, Aritoki Suzuki, M. Szydagis, Tim M.P. Tait,
Volodymyr Takhistov, Yu-Dai Tsai, S. E. Vahsen, Edoardo Vitagliano, Philip
von Doetinchem, Gensheng Wang, Shawn Westerdale, David A. Williams, Xin
Xiang, Liang Yang
|
Report of the Topical Group on Particle Dark Matter for Snowmass 2021
|
Submitted 30 pages, 11 figures, many references, Report of the CF1
Topical Group for Snowmass 2021
| null | null | null |
hep-ph astro-ph.CO astro-ph.HE hep-ex
|
http://creativecommons.org/licenses/by/4.0/
|
This report summarizes the findings of the CF1 Topical Subgroup to Snowmass
2021, which was focused on particle dark matter. One of the most important
scientific goals of the next decade is to reveal the nature of dark matter
(DM). To accomplish this goal, we must delve deep, to cover high priority
targets including weakly-interacting massive particles (WIMPs), and search
wide, to explore as much motivated DM parameter space as possible. A diverse,
continuous portfolio of experiments at large, medium, and small scales that
includes both direct and indirect detection techniques maximizes the
probability of discovering particle DM. Detailed calibrations and modeling of
signal and background processes are required to make a convincing discovery. In
the event that a candidate particle is found through different means, for
example at a particle collider, the program described in this report is also
essential to show that it is consistent with the actual cosmological DM. The US
has a leading role in both direct and indirect detection dark matter
experiments -- to maintain this leading role, it is imperative to continue
funding major experiments and support a robust R\&D program.
|
[
{
"created": "Thu, 15 Sep 2022 16:17:12 GMT",
"version": "v1"
}
] |
2022-09-16
|
[
[
"Cooley",
"Jodi",
""
],
[
"Lin",
"Tongyan",
""
],
[
"Lippincott",
"W. Hugh",
""
],
[
"Slatyer",
"Tracy R.",
""
],
[
"Yu",
"Tien-Tien",
""
],
[
"Akerib",
"Daniel S.",
""
],
[
"Aramaki",
"Tsuguo",
""
],
[
"Baxter",
"Daniel",
""
],
[
"Bringmann",
"Torsten",
""
],
[
"Bunker",
"Ray",
""
],
[
"Carney",
"Daniel",
""
],
[
"Cebrián",
"Susana",
""
],
[
"Chen",
"Thomas Y.",
""
],
[
"Cushman",
"Priscilla",
""
],
[
"Dahl",
"C. E.",
""
],
[
"Essig",
"Rouven",
""
],
[
"Fan",
"Alden",
""
],
[
"Gaitskell",
"Richard",
""
],
[
"Galbiati",
"Cristano",
""
],
[
"Gelmini",
"Graciela B.",
""
],
[
"Giovanetti",
"Graham K.",
""
],
[
"Giroux",
"Guillaume",
""
],
[
"Grandi",
"Luca",
""
],
[
"Harding",
"J. Patrick",
""
],
[
"Haselschwardt",
"Scott",
""
],
[
"Hsu",
"Lauren",
""
],
[
"Horiuchi",
"Shunsaku",
""
],
[
"Kahn",
"Yonatan",
""
],
[
"Kim",
"Doojin",
""
],
[
"Kim",
"Geon-Bo",
""
],
[
"Kravitz",
"Scott",
""
],
[
"Kudryavtsev",
"V. A.",
""
],
[
"Kurinsky",
"Noah",
""
],
[
"Lang",
"Rafael F.",
""
],
[
"Leane",
"Rebecca K.",
""
],
[
"Lehmann",
"Benjamin V.",
""
],
[
"Levy",
"Cecilia",
""
],
[
"Li",
"Shengchao",
""
],
[
"Loer",
"Ben",
""
],
[
"Manalaysay",
"Aaron",
""
],
[
"Martoff",
"C. J",
""
],
[
"Mohlabeng",
"Gopolang",
""
],
[
"Monzani",
"M. E.",
""
],
[
"Murphy",
"Alexander St J.",
""
],
[
"Neilson",
"Russell",
""
],
[
"Nelson",
"Harry N.",
""
],
[
"O'Hare",
"Ciaran A. J.",
""
],
[
"Palladino",
"K. J.",
""
],
[
"Parikh",
"Aditya",
""
],
[
"Park",
"Jong-Chul",
""
],
[
"Perez",
"Kerstin",
""
],
[
"Profumo",
"Stefano",
""
],
[
"Raj",
"Nirmal",
""
],
[
"Roach",
"Brandon M.",
""
],
[
"Saab",
"Tarek",
""
],
[
"Sarsa",
"Maria Luísa",
""
],
[
"Schnee",
"Richard",
""
],
[
"Shaw",
"Sally",
""
],
[
"Shin",
"Seodong",
""
],
[
"Sinha",
"Kuver",
""
],
[
"Stifter",
"Kelly",
""
],
[
"Suzuki",
"Aritoki",
""
],
[
"Szydagis",
"M.",
""
],
[
"Tait",
"Tim M. P.",
""
],
[
"Takhistov",
"Volodymyr",
""
],
[
"Tsai",
"Yu-Dai",
""
],
[
"Vahsen",
"S. E.",
""
],
[
"Vitagliano",
"Edoardo",
""
],
[
"von Doetinchem",
"Philip",
""
],
[
"Wang",
"Gensheng",
""
],
[
"Westerdale",
"Shawn",
""
],
[
"Williams",
"David A.",
""
],
[
"Xiang",
"Xin",
""
],
[
"Yang",
"Liang",
""
]
] |
This report summarizes the findings of the CF1 Topical Subgroup to Snowmass 2021, which was focused on particle dark matter. One of the most important scientific goals of the next decade is to reveal the nature of dark matter (DM). To accomplish this goal, we must delve deep, to cover high priority targets including weakly-interacting massive particles (WIMPs), and search wide, to explore as much motivated DM parameter space as possible. A diverse, continuous portfolio of experiments at large, medium, and small scales that includes both direct and indirect detection techniques maximizes the probability of discovering particle DM. Detailed calibrations and modeling of signal and background processes are required to make a convincing discovery. In the event that a candidate particle is found through different means, for example at a particle collider, the program described in this report is also essential to show that it is consistent with the actual cosmological DM. The US has a leading role in both direct and indirect detection dark matter experiments -- to maintain this leading role, it is imperative to continue funding major experiments and support a robust R\&D program.
|
0801.2093
|
Gennady Lykasov I
|
Gennady Lykasov and Vadim Bednyakov
|
Monitoring of charmed and beauty quark distributions in proton at LHC
|
7 pages, 1 figure. Talk given at the HADRON STRUCTURE '07
International Conference, Bratislava, Slovakia, September 3-7, 2007
| null | null | null |
hep-ph
| null |
A short review on charmed and beauty hadron production in the lepton deep
inelastic scattering off proton, in proton-proton and proton-antiproton
collisions at high energies is presented. It is shown that the existing
theoretical and experimental information on charmed and beauty quark
distributions in a proton is not satisfactory. A some procedure to study these
distributions at LHC energies is suggested.
|
[
{
"created": "Mon, 14 Jan 2008 15:36:33 GMT",
"version": "v1"
},
{
"created": "Tue, 15 Jan 2008 08:06:50 GMT",
"version": "v2"
}
] |
2008-01-15
|
[
[
"Lykasov",
"Gennady",
""
],
[
"Bednyakov",
"Vadim",
""
]
] |
A short review on charmed and beauty hadron production in the lepton deep inelastic scattering off proton, in proton-proton and proton-antiproton collisions at high energies is presented. It is shown that the existing theoretical and experimental information on charmed and beauty quark distributions in a proton is not satisfactory. A some procedure to study these distributions at LHC energies is suggested.
|
1812.06213
|
Cristian Villavicencio
|
Cristian Villavicencio, Marcelo Loewe and Alfredo Raya
|
Pions near condensation under compact star conditions
|
5 pages, 2 figures. Contribution to the 8th International Workshop on
Astronomy and Relativistic Astrophysics, IWARA2018. To appear in the
proceedings
| null |
10.1002/asna.201913585
| null |
hep-ph astro-ph.HE nucl-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
The behavior of pions is studied in systems where their normal leptonic decay
is forbidden. When thermal fluctuations are present, a low decay rate is
generated, and as a consequence of lepton recombination, the amount of pions
remains almost unaltered. Compact stars conditions are favorable for the
formation of such intermediate state of charged pions: near condensation and
almost stable, leading to a continuum source of anti-neutrinos. In particular,
protoneutron stars could be an scenario where this state of matter is relevant.
|
[
{
"created": "Sat, 15 Dec 2018 00:58:53 GMT",
"version": "v1"
}
] |
2019-04-10
|
[
[
"Villavicencio",
"Cristian",
""
],
[
"Loewe",
"Marcelo",
""
],
[
"Raya",
"Alfredo",
""
]
] |
The behavior of pions is studied in systems where their normal leptonic decay is forbidden. When thermal fluctuations are present, a low decay rate is generated, and as a consequence of lepton recombination, the amount of pions remains almost unaltered. Compact stars conditions are favorable for the formation of such intermediate state of charged pions: near condensation and almost stable, leading to a continuum source of anti-neutrinos. In particular, protoneutron stars could be an scenario where this state of matter is relevant.
|
hep-ph/9809572
|
Alan Kostelecky
|
Alan Kostelecky
|
Sensitivity of CPT Tests with Neutral Mesons
|
4 pages REVTeX, published in Physical Review Letters
|
Phys.Rev.Lett.80:1818,1998
|
10.1103/PhysRevLett.80.1818
|
IUHET 377, November 1997
|
hep-ph
| null |
The sensitivity of experiments with neutral mesons to possible indirect CPT
violation is examined. It is shown that experiments conventionally regarded as
equivalent can have CPT reaches differing by orders of magnitude within the
framework of a minimal CPT- and Lorentz-violating extension of the standard
model.
|
[
{
"created": "Mon, 28 Sep 1998 20:58:03 GMT",
"version": "v1"
}
] |
2009-09-25
|
[
[
"Kostelecky",
"Alan",
""
]
] |
The sensitivity of experiments with neutral mesons to possible indirect CPT violation is examined. It is shown that experiments conventionally regarded as equivalent can have CPT reaches differing by orders of magnitude within the framework of a minimal CPT- and Lorentz-violating extension of the standard model.
|
hep-ph/9901220
|
Eung Jin Chun
|
Eung Jin Chun
|
Axino-Neutrino Mixing in Gauge-Mediated Supersymmetry Breaking Models
|
Revtex, 7 pp. Version to appear in Phys. Lett. B
|
Phys.Lett. B454 (1999) 304-308
|
10.1016/S0370-2693(99)00351-2
|
KIAS-P99002
|
hep-ph
| null |
When the strong CP problem is solved by spontaneous breaking of an anomalous
global symmetry in theories with gauge-mediated supersymmetry breaking, the
pseudo Goldstone fermion (the axino) is a good candidate of a light sterile
neutrino. Its mixing with neutrinos relevant for current neutrino experiments
can arise in the presence of R-parity violation. The realistic four neutrino
mass matrix is obtained when the see-saw mechanism is brought in, and an ansatz
for the right-handed neutrino mass is constructed.
|
[
{
"created": "Tue, 5 Jan 1999 08:58:32 GMT",
"version": "v1"
},
{
"created": "Tue, 6 Apr 1999 09:16:29 GMT",
"version": "v2"
}
] |
2009-10-31
|
[
[
"Chun",
"Eung Jin",
""
]
] |
When the strong CP problem is solved by spontaneous breaking of an anomalous global symmetry in theories with gauge-mediated supersymmetry breaking, the pseudo Goldstone fermion (the axino) is a good candidate of a light sterile neutrino. Its mixing with neutrinos relevant for current neutrino experiments can arise in the presence of R-parity violation. The realistic four neutrino mass matrix is obtained when the see-saw mechanism is brought in, and an ansatz for the right-handed neutrino mass is constructed.
|
1110.1558
|
Sacha Davidson
|
Sacha Davidson, Veronica Sanz
|
Non standard neutrino interactions at LEP2 and the LHC
|
4 pages, contribution to NUFACT 11, XIIIth International Workshop on
Neutrino Factories, Super beams and Beta beams, 1-6 August 2011, CERN and
University of Geneva (Submitted to IOP conference series)
| null | null | null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We consider Non-Standard neutrino Interactions (NSI) connecting two neutrinos
with two first-generation fermions ($e, u$ or $d$), which we assume to arise at
at dimension eight due to New Physics. The coefficient is normalised as $4
\epsilon G_F/\sqrt{2}$. We explore signatures of NSI-on-electrons at LEP2, and
of NSI-on-quarks at the LHC, treating the NSI as contact interactions at both
energies. In models where the coefficients of dangerous dimension six operators
are suppressed by cancellations, LEP2 provides interesting bounds on NSI
operators ($\epsilon \lsim 10^{-2} - 10^{-3}$), which arise because $\sqrt{s}
\sim 200$ GeV, and the cancellation applied at zero momentum transfer. At the
LHC, we use the Equivalence Theorem, which relates the longitudinal $W$ to the
Higgs, to estimate the rate for $\bar{q} q W^+W^- e_\alpha^+ e_\beta^-$ induced
by NSI. We find that the cross-section is small, but that the outgoing
particles have very high $p_T > 400$ GeV, which reduces the issue of
backgrounds. In a conservative scenario, we find that the LHC at 14 TeV and
with 100 fb$^{-1}$ of data would have a sensitivity to $\epsilon \gsim 3 \times
10^{-3}$.
|
[
{
"created": "Fri, 7 Oct 2011 15:00:43 GMT",
"version": "v1"
}
] |
2011-10-10
|
[
[
"Davidson",
"Sacha",
""
],
[
"Sanz",
"Veronica",
""
]
] |
We consider Non-Standard neutrino Interactions (NSI) connecting two neutrinos with two first-generation fermions ($e, u$ or $d$), which we assume to arise at at dimension eight due to New Physics. The coefficient is normalised as $4 \epsilon G_F/\sqrt{2}$. We explore signatures of NSI-on-electrons at LEP2, and of NSI-on-quarks at the LHC, treating the NSI as contact interactions at both energies. In models where the coefficients of dangerous dimension six operators are suppressed by cancellations, LEP2 provides interesting bounds on NSI operators ($\epsilon \lsim 10^{-2} - 10^{-3}$), which arise because $\sqrt{s} \sim 200$ GeV, and the cancellation applied at zero momentum transfer. At the LHC, we use the Equivalence Theorem, which relates the longitudinal $W$ to the Higgs, to estimate the rate for $\bar{q} q W^+W^- e_\alpha^+ e_\beta^-$ induced by NSI. We find that the cross-section is small, but that the outgoing particles have very high $p_T > 400$ GeV, which reduces the issue of backgrounds. In a conservative scenario, we find that the LHC at 14 TeV and with 100 fb$^{-1}$ of data would have a sensitivity to $\epsilon \gsim 3 \times 10^{-3}$.
|
2204.10130
|
Oscar J. P. \'Eboli
|
Eduardo da Silva Almeida, Alexandre Alves, Oscar J. P. Eboli, and M.
C. Gonzalez-Garcia
|
Impact of CDF-II measurement of $M_W$ on the electroweak legacy of the
LHC Run II
|
6 pages, 3 figures
| null | null | null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We analyze the impact of the recently released CDF-II measurement of $W$ mass
on the SMEFT analyses of the electroweak precision data as well as Higgs and
electroweak diboson productions. We work in the Hagiwara, Ishihara, Szalapski,
and Zeppenfeld basis in which eight generation-independent operators enter in
the electroweak precision data at tree level and, unlike in the Warsaw basis,
the analysis of that set of data constrains all the eight Wilson coefficients,
without the need of combination with Higgs or electroweak diboson data results.
We show that in the global analysis the determination of the coefficients of
all operators which do not enter the electroweak precision data are barely
affected by the new $M_W$ determination.
|
[
{
"created": "Thu, 21 Apr 2022 17:41:29 GMT",
"version": "v1"
}
] |
2022-04-22
|
[
[
"Almeida",
"Eduardo da Silva",
""
],
[
"Alves",
"Alexandre",
""
],
[
"Eboli",
"Oscar J. P.",
""
],
[
"Gonzalez-Garcia",
"M. C.",
""
]
] |
We analyze the impact of the recently released CDF-II measurement of $W$ mass on the SMEFT analyses of the electroweak precision data as well as Higgs and electroweak diboson productions. We work in the Hagiwara, Ishihara, Szalapski, and Zeppenfeld basis in which eight generation-independent operators enter in the electroweak precision data at tree level and, unlike in the Warsaw basis, the analysis of that set of data constrains all the eight Wilson coefficients, without the need of combination with Higgs or electroweak diboson data results. We show that in the global analysis the determination of the coefficients of all operators which do not enter the electroweak precision data are barely affected by the new $M_W$ determination.
|
hep-ph/9901347
|
A. A. Penin
|
A.A.Penin and A.A.Pivovarov
|
Comment on ``Next-to-next-to-leading order vacuum polarization function
of heavy quark near threshold and sum rules for $b \bar b$ system'' and
``Next-to-next-to-leading order relation between $R(e^+e^-\to b\bar b)$ and
$\Gamma_{\rm sl}(b\to cl\nu_l)$ and precise determination of $|V_{cb}|$''
|
3 pages, LaTeX
| null | null |
preprint INR 98-979c
|
hep-ph
| null |
The most recent recalculation of the two-loop correction to the static
quark-antiquark potential gave the numerical value different from the
previously known one. We comment on the effect this change produces on the
numerical estimates of the bottom quark pole mass $m_b$, the strong coupling
constant $\al_s$ and the Cabibbo-Kobayashi-Maskawa matrix element $|V_{cb}|$
obtained in our papers [1,2].
|
[
{
"created": "Tue, 19 Jan 1999 11:22:31 GMT",
"version": "v1"
}
] |
2007-05-23
|
[
[
"Penin",
"A. A.",
""
],
[
"Pivovarov",
"A. A.",
""
]
] |
The most recent recalculation of the two-loop correction to the static quark-antiquark potential gave the numerical value different from the previously known one. We comment on the effect this change produces on the numerical estimates of the bottom quark pole mass $m_b$, the strong coupling constant $\al_s$ and the Cabibbo-Kobayashi-Maskawa matrix element $|V_{cb}|$ obtained in our papers [1,2].
|
hep-ph/9609264
|
Antonio Vairo I. N. F. N. Bologna
|
A. Vairo
|
Gauge invariance on bound state energy levels
|
9 pages, Latex, 8 figures. Talk given at the NATO-ASI, Electron
Theory and Quantum Electrodynamics, Edirne 8-16 September 1994
|
Electron Theory and Quantum Electrodynamics, Vol. B 358, 37, ed.
J. Dowling, (Plenum, New York, 1997)
| null |
DFUB-95-18
|
hep-ph
| null |
In this paper the problem of the gauge in a bound state calculation is
discussed. In particular, in order to verify the gauge invariance in the energy
levels expansion, some set of gauge invariant contributions are given.
|
[
{
"created": "Thu, 5 Sep 1996 13:50:37 GMT",
"version": "v1"
}
] |
2007-05-23
|
[
[
"Vairo",
"A.",
""
]
] |
In this paper the problem of the gauge in a bound state calculation is discussed. In particular, in order to verify the gauge invariance in the energy levels expansion, some set of gauge invariant contributions are given.
|
2110.09423
|
Jun-Zhang Wang
|
Jun-Zhang Wang, Xiang Liu and Takayuki Matsuki
|
Evidence supporting the existence of $P_c(4380)^{\pm}$ from the recent
measurements of $B_s \to J/\psi p\bar{p}$
|
8 pages, 2 tables and 3 figures, accepted by Physical Review D
|
Phys.Rev.D 104, 114020 (2021)
|
10.1103/PhysRevD.104.114020
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Very recently, the LHCb collaboration released the newest measurements of
$B_s \to J/\psi p\bar{p}$, where an enhancement structure near 4.34 GeV was
observed in the invariant mass spectrum of $J/\psi p$ with the statistical
significance of $3.1-3.7$ $\sigma$. In this work, by performing a combined
analysis for the three invariant mass spectra of $B_s \to J/\psi p\bar{p}$, we
find that this $J/\psi p$ structure near 4.34 GeV can correspond to the
contributions from the $P_c(4380)^+$ state with the assumption of
$J^{P}=3/2^{-}$ together with the reflections of $B_s \to (f_2^{*} \to
p\bar{p})J/\psi$. Here, $P_c(4380)$ was first observed in $\Lambda_b \to J/\psi
p K$ but not confirmed in the updated LHCb data in 2019, and $f_2^{*}$ means
the exciting light isoscalar tensor meson around 2.0 GeV. Thus, this provides a
possible evidence to support the existence of the pentaquark $P_c(4380)$.
Specifically, the assumed spin parity $J^{P}=3/2^{-}$ of $P_c(4380)$ is
consistent with a prediction of the theoretical explanation of an $S$-wave
$\bar{D}\Sigma_c^*$ molecular bound state.
|
[
{
"created": "Mon, 18 Oct 2021 15:52:27 GMT",
"version": "v1"
},
{
"created": "Sun, 19 Dec 2021 11:41:20 GMT",
"version": "v2"
}
] |
2021-12-22
|
[
[
"Wang",
"Jun-Zhang",
""
],
[
"Liu",
"Xiang",
""
],
[
"Matsuki",
"Takayuki",
""
]
] |
Very recently, the LHCb collaboration released the newest measurements of $B_s \to J/\psi p\bar{p}$, where an enhancement structure near 4.34 GeV was observed in the invariant mass spectrum of $J/\psi p$ with the statistical significance of $3.1-3.7$ $\sigma$. In this work, by performing a combined analysis for the three invariant mass spectra of $B_s \to J/\psi p\bar{p}$, we find that this $J/\psi p$ structure near 4.34 GeV can correspond to the contributions from the $P_c(4380)^+$ state with the assumption of $J^{P}=3/2^{-}$ together with the reflections of $B_s \to (f_2^{*} \to p\bar{p})J/\psi$. Here, $P_c(4380)$ was first observed in $\Lambda_b \to J/\psi p K$ but not confirmed in the updated LHCb data in 2019, and $f_2^{*}$ means the exciting light isoscalar tensor meson around 2.0 GeV. Thus, this provides a possible evidence to support the existence of the pentaquark $P_c(4380)$. Specifically, the assumed spin parity $J^{P}=3/2^{-}$ of $P_c(4380)$ is consistent with a prediction of the theoretical explanation of an $S$-wave $\bar{D}\Sigma_c^*$ molecular bound state.
|
2007.15075
|
Keh-Fei Liu
|
Keh-Fei Liu
|
PDF in PDFs from Hadronic Tensor and LaMET
|
References added, version to be published in PRD
|
Phys. Rev. D 102, 074502 (2020)
|
10.1103/PhysRevD.102.074502
| null |
hep-ph hep-lat nucl-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We point out a problem of the phenomenological definition of the valence
partons as the difference between the partons and antipartons in the context of
the NNLO evolution equations. After demonstrating that the classification of
the parton degrees of freedom (PDF) of the parton distribution functions (PDFs)
are the same in the QCD path-intergral formulations of the hadronic tensor and
the quasi-PDF with LaMET, we resolve the problem by showing that the proper
definition of the valence should be in terms of those in the connected
insertions only. We also prove that the strange partons appear as the
disconnected sea in the nucleon.
|
[
{
"created": "Wed, 29 Jul 2020 19:45:32 GMT",
"version": "v1"
},
{
"created": "Thu, 17 Sep 2020 20:10:26 GMT",
"version": "v2"
}
] |
2020-10-14
|
[
[
"Liu",
"Keh-Fei",
""
]
] |
We point out a problem of the phenomenological definition of the valence partons as the difference between the partons and antipartons in the context of the NNLO evolution equations. After demonstrating that the classification of the parton degrees of freedom (PDF) of the parton distribution functions (PDFs) are the same in the QCD path-intergral formulations of the hadronic tensor and the quasi-PDF with LaMET, we resolve the problem by showing that the proper definition of the valence should be in terms of those in the connected insertions only. We also prove that the strange partons appear as the disconnected sea in the nucleon.
|
1002.1835
|
Nobuhito Maru
|
Nobuhito Maru and Nobuchika Okada
|
Gauge-Higgs Unification at the LHC
|
7 pages, 2 figures, To appear in the proceedings of 2009 Nagoya
Global COE Workshop, Strong Coupling Gauge Theories in LHC era (SCGT09),
December 8-11 2009, Nagoya, Japan
| null |
10.1142/9789814329521_0017
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Higgs boson production by the gluon fusion and its decay into two photons at
the LHC are investigated in the context of the gauge-Higgs unification
scenario. The qualitative behaviors for these processes in the scenario are
quite distinguishable from those of the Standard Model and the universal extra
dimension scenario because of the overall sign difference for the effective
couplings induced by one-loop corrections through Kaluza-Klein modes.
|
[
{
"created": "Tue, 9 Feb 2010 12:24:29 GMT",
"version": "v1"
}
] |
2017-08-23
|
[
[
"Maru",
"Nobuhito",
""
],
[
"Okada",
"Nobuchika",
""
]
] |
Higgs boson production by the gluon fusion and its decay into two photons at the LHC are investigated in the context of the gauge-Higgs unification scenario. The qualitative behaviors for these processes in the scenario are quite distinguishable from those of the Standard Model and the universal extra dimension scenario because of the overall sign difference for the effective couplings induced by one-loop corrections through Kaluza-Klein modes.
|
hep-ph/9807286
|
Dr Ian Kogan
|
Ian I. Kogan, Alex Kovner and M. A. Shifman
|
Chiral Symmetry Breaking without Bilinear Condensates, Unbroken Axial
Z_N Symmetry, and Exact QCD Inequalities
|
9 pages, Latex, clarifying comments and several references added
|
Phys. Rev. D 59, 016001 (1998)
|
10.1103/PhysRevD.59.016001
|
OUTP-98-50P; TPI-MINN-98/05-T; UMN-TH-1708-98
|
hep-ph hep-th
| null |
An alternative pattern of the chiral symmetry breaking, suggested recently by
Stern, is investigated. It could be self-consistent provided that the chiral
$SU(N_f) \times SU(N_f)$ symmetry is broken spontaneously down to $SU(N_f)
\times Z_{N_f}$ rather than to $SU(N_f)_V$. The discrete axial $Z_{N_f}$ then
would play a custodial role preventing the quark bilinears from condensation.
It is shown that this pattern of the chiral symmetry breaking is ruled out in
QCD by exact inequalities. It is not ruled out, however, in other gauge
theories with scalar quarks and/or Yukawa couplings.
|
[
{
"created": "Wed, 8 Jul 1998 10:15:00 GMT",
"version": "v1"
},
{
"created": "Thu, 23 Jul 1998 21:37:56 GMT",
"version": "v2"
}
] |
2016-08-25
|
[
[
"Kogan",
"Ian I.",
""
],
[
"Kovner",
"Alex",
""
],
[
"Shifman",
"M. A.",
""
]
] |
An alternative pattern of the chiral symmetry breaking, suggested recently by Stern, is investigated. It could be self-consistent provided that the chiral $SU(N_f) \times SU(N_f)$ symmetry is broken spontaneously down to $SU(N_f) \times Z_{N_f}$ rather than to $SU(N_f)_V$. The discrete axial $Z_{N_f}$ then would play a custodial role preventing the quark bilinears from condensation. It is shown that this pattern of the chiral symmetry breaking is ruled out in QCD by exact inequalities. It is not ruled out, however, in other gauge theories with scalar quarks and/or Yukawa couplings.
|
0710.2360
|
John McDonald
|
John McDonald
|
RH Sneutrino Condensate CDM and the Baryon-to-Dark Matter Ratio
|
Submitted for the SUSY07 proceedings, 4 pages, LaTeX, 2 eps figures
| null | null | null |
hep-ph astro-ph hep-th
| null |
The similarity of the observed mass densities of baryons and cold dark matter
may be a sign they have a related origin. The baryon-to-dark matter ratio can
be understood in the MSSM with right-handed (RH) neutrinos if CDM is due to a d
= 4 flat direction condensate of very weakly coupled RH sneutrino LSPs and the
baryon asymmetry is generated by Affleck-Dine leptogenesis along a d = 4
(H_{u}L)^2 flat direction. Observable signatures of the model include CDM and
baryon isocurvature perturbations and distinctive long-lived NLSP
phenomenology.
|
[
{
"created": "Fri, 12 Oct 2007 10:56:28 GMT",
"version": "v1"
}
] |
2007-10-24
|
[
[
"McDonald",
"John",
""
]
] |
The similarity of the observed mass densities of baryons and cold dark matter may be a sign they have a related origin. The baryon-to-dark matter ratio can be understood in the MSSM with right-handed (RH) neutrinos if CDM is due to a d = 4 flat direction condensate of very weakly coupled RH sneutrino LSPs and the baryon asymmetry is generated by Affleck-Dine leptogenesis along a d = 4 (H_{u}L)^2 flat direction. Observable signatures of the model include CDM and baryon isocurvature perturbations and distinctive long-lived NLSP phenomenology.
|
hep-ph/9809504
|
James Wells
|
James D. Wells (CERN)
|
Supersymmetric dark matter with a cosmological constant
|
8 pages, latex, 2 figures
|
Phys.Lett. B443 (1998) 196-200
|
10.1016/S0370-2693(98)01327-6
|
CERN-TH/98-308
|
hep-ph
| null |
Recent measurements of cosmological parameters from the microwave background
radiation, type Ia supernovae, and the age of globular clusters help determine
the relic matter density in the universe. It is first shown with mild
cosmological assumptions that the relic matter density satisfies $\Omega_M h^2
< 0.6$ independent of the cosmological constant and independent of the SNIa
data. Including the SNIa data, the constraint becomes $\Omega_M h^2 < 0.35$.
This result is then applied to supersymmetric models motivated by generic
features in supergravity mediated supersymmetry breaking. The result is an
upper bound on gaugino masses within reach of the LHC and a 1.5 TeV lepton
collider. Thus, cosmological considerations are beginning to limit the
supersymmetric mass spectra in the experimentally verifiable range without
recourse to finetuning arguments, and without assuming a zero cosmological
constant.
|
[
{
"created": "Wed, 23 Sep 1998 15:19:38 GMT",
"version": "v1"
}
] |
2009-10-31
|
[
[
"Wells",
"James D.",
"",
"CERN"
]
] |
Recent measurements of cosmological parameters from the microwave background radiation, type Ia supernovae, and the age of globular clusters help determine the relic matter density in the universe. It is first shown with mild cosmological assumptions that the relic matter density satisfies $\Omega_M h^2 < 0.6$ independent of the cosmological constant and independent of the SNIa data. Including the SNIa data, the constraint becomes $\Omega_M h^2 < 0.35$. This result is then applied to supersymmetric models motivated by generic features in supergravity mediated supersymmetry breaking. The result is an upper bound on gaugino masses within reach of the LHC and a 1.5 TeV lepton collider. Thus, cosmological considerations are beginning to limit the supersymmetric mass spectra in the experimentally verifiable range without recourse to finetuning arguments, and without assuming a zero cosmological constant.
|
1910.03408
|
Juan Rojo
|
Juan Rojo
|
The Partonic Content of Nucleons and Nuclei
|
26 pages, 13 figures, version to be published as Invited Review
Article in the Oxford Research Encyclopaedia of Physics
| null | null |
Nikhef/2019-042
|
hep-ph hep-ex nucl-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Deepening our knowledge of the partonic content of nucleons and nuclei
represents a central endeavour of modern high-energy and nuclear physics, with
ramifications in related disciplines such as astroparticle physics. There are
two main scientific drivers motivating these investigations of the partonic
structure of hadrons. On the one hand, addressing fundamental open issues in
our understanding in the strong interactions such as the origin of the nucleon
mass, spin, and transverse structure; the presence of heavy quarks in the
nucleon wave function; and the possible onset of novel gluon-dominated
dynamical regimes. On the other hand, pinning down with the highest possible
precision the substructure of nucleons and nuclei is a central component for
theoretical predictions in a wide range of experiments, from proton and heavy
ion collisions at the Large Hadron Collider to ultra-high energy neutrino
interactions at neutrino telescopes. This Article presents a succinct
non-technical overview of our modern understanding of the quark, gluon, and
photon substructure of nucleons and nuclei, focusing on recent trends and
results and discussing future perspectives for the field.
|
[
{
"created": "Tue, 8 Oct 2019 14:08:28 GMT",
"version": "v1"
},
{
"created": "Tue, 25 Feb 2020 14:26:08 GMT",
"version": "v2"
}
] |
2020-02-26
|
[
[
"Rojo",
"Juan",
""
]
] |
Deepening our knowledge of the partonic content of nucleons and nuclei represents a central endeavour of modern high-energy and nuclear physics, with ramifications in related disciplines such as astroparticle physics. There are two main scientific drivers motivating these investigations of the partonic structure of hadrons. On the one hand, addressing fundamental open issues in our understanding in the strong interactions such as the origin of the nucleon mass, spin, and transverse structure; the presence of heavy quarks in the nucleon wave function; and the possible onset of novel gluon-dominated dynamical regimes. On the other hand, pinning down with the highest possible precision the substructure of nucleons and nuclei is a central component for theoretical predictions in a wide range of experiments, from proton and heavy ion collisions at the Large Hadron Collider to ultra-high energy neutrino interactions at neutrino telescopes. This Article presents a succinct non-technical overview of our modern understanding of the quark, gluon, and photon substructure of nucleons and nuclei, focusing on recent trends and results and discussing future perspectives for the field.
|
hep-ph/0604180
|
Sven Heinemeyer
|
J. Ellis, S. Heinemeyer, K.A. Olive, G. Weiglein
|
Indications of the CMSSM Mass Scale from Precision Electroweak Data
|
16 pages, 9 figures. Contribution to the "2005 International Linear
Collider and Detector Workshop", Snowmass, Colorado, August 14-27, 2005
| null | null |
CERN-PH-TH/2006-068, DCPT/06/48, IPPP/06/24, FTPI-MINN-06/12,
UMN-TH-2440/06
|
hep-ph
| null |
We discuss the sensitivities of present-day electroweak precision data to the
possible scale of supersymmetry within the constrained minimal supersymmetric
extension of the Standard Model (CMSSM). Our analysis is based on M_W, sin^2
theta_eff, (g-2)_mu, BR(b -> s gamma), and the lightest MSSM Higgs boson mass,
M_h. We display the impact of the recent reduction in m_t from 178.0 +- 4.3 GeV
to 172.7 +- 2.9 GeV on the interpretation of the precision observables. We show
the currently preferred values of the CMSSM mass scale m_{1/2} based on a
global chi^2 fit, assuming that the lightest supersymmetric particle (LSP) is a
neutralino, and fixing m_0 so as to obtain the cold dark matter density allowed
by WMAP and other cosmological data for specific values of A_0, tan beta and mu
> 0. The recent reduction in m_t reinforces previous indications for relatively
light soft supersymmetry-breaking masses, offering good prospects for the LHC
and the ILC, and in some cases also for the Tevatron. Finally, we discuss the
sensitivity of the global chi^2 function to possible future evolution in the
experimental central value of m_t and its error.
|
[
{
"created": "Fri, 21 Apr 2006 07:43:09 GMT",
"version": "v1"
}
] |
2007-05-23
|
[
[
"Ellis",
"J.",
""
],
[
"Heinemeyer",
"S.",
""
],
[
"Olive",
"K. A.",
""
],
[
"Weiglein",
"G.",
""
]
] |
We discuss the sensitivities of present-day electroweak precision data to the possible scale of supersymmetry within the constrained minimal supersymmetric extension of the Standard Model (CMSSM). Our analysis is based on M_W, sin^2 theta_eff, (g-2)_mu, BR(b -> s gamma), and the lightest MSSM Higgs boson mass, M_h. We display the impact of the recent reduction in m_t from 178.0 +- 4.3 GeV to 172.7 +- 2.9 GeV on the interpretation of the precision observables. We show the currently preferred values of the CMSSM mass scale m_{1/2} based on a global chi^2 fit, assuming that the lightest supersymmetric particle (LSP) is a neutralino, and fixing m_0 so as to obtain the cold dark matter density allowed by WMAP and other cosmological data for specific values of A_0, tan beta and mu > 0. The recent reduction in m_t reinforces previous indications for relatively light soft supersymmetry-breaking masses, offering good prospects for the LHC and the ILC, and in some cases also for the Tevatron. Finally, we discuss the sensitivity of the global chi^2 function to possible future evolution in the experimental central value of m_t and its error.
|
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