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|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
1501.05483
|
Luiz Vale Silva
|
Luiz Vale Silva
|
Constraining the Doublet Left-Right Model
|
Proceedings of the workshop "Flavorful Ways to New Physics", 28-31
October 2014, Freudenstadt, Germany
| null | null | null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Left-Right Models (LRM) attempt at giving an understanding of the violation
of parity (or charge-conjugation) by the weak interactions in the SM through a
similar description of left- and right-handed currents at high energies. The
spontaneous symmetry breaking of the LRM gauge group is triggered by an
enlarged Higgs sector, usually consisting of two triplet fields (left-right
symmetry breaking) and a bidoublet (electroweak symmetry breaking). I
reconsider an alternative LRM with doublet instead of triplet fields. After
explaining some features of this model, I discuss constraints on its parameters
using electroweak precision observables (combined using the CKMfitter
frequentist statistical framework) and neutral-meson mixing observables.
|
[
{
"created": "Thu, 22 Jan 2015 12:56:31 GMT",
"version": "v1"
}
] |
2015-01-23
|
[
[
"Silva",
"Luiz Vale",
""
]
] |
Left-Right Models (LRM) attempt at giving an understanding of the violation of parity (or charge-conjugation) by the weak interactions in the SM through a similar description of left- and right-handed currents at high energies. The spontaneous symmetry breaking of the LRM gauge group is triggered by an enlarged Higgs sector, usually consisting of two triplet fields (left-right symmetry breaking) and a bidoublet (electroweak symmetry breaking). I reconsider an alternative LRM with doublet instead of triplet fields. After explaining some features of this model, I discuss constraints on its parameters using electroweak precision observables (combined using the CKMfitter frequentist statistical framework) and neutral-meson mixing observables.
|
2011.04679
|
Brian Colquhoun
|
Brian Colquhoun, Saniya Heeba, Felix Kahlhoefer, Laura Sagunski, Sean
Tulin
|
The Semi-Classical Regime for Dark Matter Self-Interactions
|
25 pages + appendices, 8 figures + 1 table, CLASSICS code to
calculate self-interaction cross sections available at
https://github.com/kahlhoefer/CLASSICS. v2: updated to reflect published
version
|
Phys. Rev. D 103, 035006 (2021)
|
10.1103/PhysRevD.103.035006
|
TTK-20-39
|
hep-ph astro-ph.CO astro-ph.GA
|
http://creativecommons.org/licenses/by/4.0/
|
Many particle physics models for dark matter self-interactions - motivated to
address long-standing challenges to the collisionless cold dark matter paradigm
- fall within the semi-classical regime, with interaction potentials that are
long-range compared to the de Broglie wavelength for dark matter particles. In
this work, we present a quantum mechanical derivation and new analytic formulas
for the semi-classical momentum transfer and viscosity cross sections for
self-interactions mediated by a Yukawa potential. Our results include the
leading quantum corrections beyond the classical limit and allow for both
distinguishable and identical dark matter particles. Our formulas supersede the
well-known formulas for the momentum transfer cross section obtained from the
classical scattering problem, which are often used in phenomenological studies
of self-interacting dark matter. Together with previous approximation formulas
for the cross section in the quantum regime, our new results allow for nearly
complete analytic coverage of the parameter space for self-interactions with a
Yukawa potential. We also discuss the phenomenological implications of our
results and provide a new velocity-averaging procedure for constraining
velocity-dependent self-interactions. Our results have been implemented in the
newly released code CLASSICS.
|
[
{
"created": "Mon, 9 Nov 2020 19:00:40 GMT",
"version": "v1"
},
{
"created": "Wed, 10 Feb 2021 19:25:54 GMT",
"version": "v2"
}
] |
2021-02-12
|
[
[
"Colquhoun",
"Brian",
""
],
[
"Heeba",
"Saniya",
""
],
[
"Kahlhoefer",
"Felix",
""
],
[
"Sagunski",
"Laura",
""
],
[
"Tulin",
"Sean",
""
]
] |
Many particle physics models for dark matter self-interactions - motivated to address long-standing challenges to the collisionless cold dark matter paradigm - fall within the semi-classical regime, with interaction potentials that are long-range compared to the de Broglie wavelength for dark matter particles. In this work, we present a quantum mechanical derivation and new analytic formulas for the semi-classical momentum transfer and viscosity cross sections for self-interactions mediated by a Yukawa potential. Our results include the leading quantum corrections beyond the classical limit and allow for both distinguishable and identical dark matter particles. Our formulas supersede the well-known formulas for the momentum transfer cross section obtained from the classical scattering problem, which are often used in phenomenological studies of self-interacting dark matter. Together with previous approximation formulas for the cross section in the quantum regime, our new results allow for nearly complete analytic coverage of the parameter space for self-interactions with a Yukawa potential. We also discuss the phenomenological implications of our results and provide a new velocity-averaging procedure for constraining velocity-dependent self-interactions. Our results have been implemented in the newly released code CLASSICS.
|
hep-ph/0412096
|
Joakim Nystrand
|
J. Nystrand
|
Electromagnetic interactions in nucleus-nucleus and proton-proton
collisions
|
10 pages, 4 figures, 3 tables. Presented at the International Nuclear
Physics Conference INPC2004, Gothenburg, Sweden, June 27 - July 2, 2004. To
be published in Nucl. Phys. A
|
Nucl.Phys. A752 (2005) 470-479
|
10.1016/j.nuclphysa.2005.02.051
| null |
hep-ph
| null |
The strong electromagnetic fields associated with ultra-relativistic protons
and nuclei correspond to an equivalent flux of photons. At the future Large
Hadron Collider at CERN, the corresponding photon-nucleon center of mass
energies will be higher than at any existing accelerator. The experimental and
theoretical aspects of particle production in electromagnetic interactions at
hadron colliders are reviewed.
|
[
{
"created": "Tue, 7 Dec 2004 15:34:26 GMT",
"version": "v1"
}
] |
2009-11-10
|
[
[
"Nystrand",
"J.",
""
]
] |
The strong electromagnetic fields associated with ultra-relativistic protons and nuclei correspond to an equivalent flux of photons. At the future Large Hadron Collider at CERN, the corresponding photon-nucleon center of mass energies will be higher than at any existing accelerator. The experimental and theoretical aspects of particle production in electromagnetic interactions at hadron colliders are reviewed.
|
hep-ph/0312250
|
Thomas Teubner
|
K. Hagiwara (KEK), A. D. Martin, Daisuke Nomura (Durham) and T.
Teubner (Liverpool)
|
Predictions for g-2 of the muon and alpha_QED(M_Z^2)
|
83 pages, 10 Tables, LaTeX, 28 PostScript figures included.
Electromagnetic contributions updated; two Refs. added and typos corrected.
Version to appear in Phys. Rev. D
|
Phys.Rev.D69:093003,2004
|
10.1103/PhysRevD.69.093003
|
KEK-TH-902, IPPP/03/41, DCPT/03/82, CERN-TH/2003-162, LTH 613
|
hep-ph
| null |
We calculate (g-2) of the muon and the QED coupling alpha(M_Z^2), by
improving the determination of the hadronic vacuum polarization contributions
and their uncertainties. We include the recently re-analysed CMD-2 data on
e^+e^- -> pi^+ pi^-. We carefully combine a wide variety of data for the e^+e^-
production of hadrons, and obtain the optimum form of R(s) =
sigma_had^0(s)/sigma_pt(s), together with its uncertainty. Our results for the
hadronic contributions to g-2 of the muon are a_mu^(had, LO) = (692.4 +-
5.9_exp +- 2.4_rad) * 10^(-10) and a_mu^(had, NLO) = (-9.8 +- 0.1_exp +-
0.0_rad) * 10^(-10), and for the QED coupling Delta alpha^(5)_had (M_Z^2)=
(275.5 +- 1.9_exp +- 1.3_rad) * 10^(-4). These yield (g-2)/2 =
0.00116591763(74), which is about 2.4 sigma below the present world average
measurement, and alpha(M_Z^2)^(-1) = 128.954 +- 0.031. We compare our (g-2)
value with other predictions and, in particular, make a detailed comparison
with the latest determination of (g-2) by Davier et al.
|
[
{
"created": "Thu, 18 Dec 2003 00:14:56 GMT",
"version": "v1"
},
{
"created": "Thu, 12 Feb 2004 17:07:29 GMT",
"version": "v2"
},
{
"created": "Wed, 28 Apr 2004 14:58:34 GMT",
"version": "v3"
}
] |
2008-11-26
|
[
[
"Hagiwara",
"K.",
"",
"KEK"
],
[
"Martin",
"A. D.",
"",
"Durham"
],
[
"Nomura",
"Daisuke",
"",
"Durham"
],
[
"Teubner",
"T.",
"",
"Liverpool"
]
] |
We calculate (g-2) of the muon and the QED coupling alpha(M_Z^2), by improving the determination of the hadronic vacuum polarization contributions and their uncertainties. We include the recently re-analysed CMD-2 data on e^+e^- -> pi^+ pi^-. We carefully combine a wide variety of data for the e^+e^- production of hadrons, and obtain the optimum form of R(s) = sigma_had^0(s)/sigma_pt(s), together with its uncertainty. Our results for the hadronic contributions to g-2 of the muon are a_mu^(had, LO) = (692.4 +- 5.9_exp +- 2.4_rad) * 10^(-10) and a_mu^(had, NLO) = (-9.8 +- 0.1_exp +- 0.0_rad) * 10^(-10), and for the QED coupling Delta alpha^(5)_had (M_Z^2)= (275.5 +- 1.9_exp +- 1.3_rad) * 10^(-4). These yield (g-2)/2 = 0.00116591763(74), which is about 2.4 sigma below the present world average measurement, and alpha(M_Z^2)^(-1) = 128.954 +- 0.031. We compare our (g-2) value with other predictions and, in particular, make a detailed comparison with the latest determination of (g-2) by Davier et al.
|
hep-ph/0212349
|
Roberto J. M. Covolan
|
R. J. M. Covolan, M. S. Soares
|
Diffractive Hadroproduction of Dijets and W's at the Tevatron Collider
and the Pomeron Structure Function
|
4 pages, REVTEX4.0. To appear in Phys. Rev. D. Final version with
minor corrections
|
Phys.Rev.D67:017503,2003
|
10.1103/PhysRevD.67.017503
| null |
hep-ph hep-ex
| null |
Results from a phenomenological analysis of dijet and W hard diffractive
hadroproduction at Fermilab Tevatron energies are reported. The theoretical
framework employed here is a modified version of the Ingelman-Schlein approach
which includes DGLAP-evolved structure functions. Different from what has been
achieved by the DESY ep HERA reactions, a reasonable overall description of
such diffractive hadron processes is obtained only when a complex, quark-rich
Pomeron structure function is employed in the calculation.
|
[
{
"created": "Mon, 23 Dec 2002 21:08:17 GMT",
"version": "v1"
},
{
"created": "Wed, 15 Jan 2003 21:50:18 GMT",
"version": "v2"
}
] |
2014-11-17
|
[
[
"Covolan",
"R. J. M.",
""
],
[
"Soares",
"M. S.",
""
]
] |
Results from a phenomenological analysis of dijet and W hard diffractive hadroproduction at Fermilab Tevatron energies are reported. The theoretical framework employed here is a modified version of the Ingelman-Schlein approach which includes DGLAP-evolved structure functions. Different from what has been achieved by the DESY ep HERA reactions, a reasonable overall description of such diffractive hadron processes is obtained only when a complex, quark-rich Pomeron structure function is employed in the calculation.
|
hep-ph/9601260
|
Robert Singleton
|
Claudio Rebbi and Robert Singleton, Jr
|
Computational Study of Baryon Number Violation in High Energy
Electroweak Collisions
|
57 pages, LaTeX, 14 figues. Four of these figures are gray scale 3D
surface plots too large to distribute in color. The full color figures can be
viewed or downloaded from http://cthulu.bu.edu/~bobs/bviolate.html
|
Phys.Rev.D54:1020-1043,1996
|
10.1103/PhysRevD.54.1020
|
BUHEP-94-34
|
hep-ph hep-lat
| null |
We use semiclassical methods to study processes which give rise to change of
topology and therefore to baryon number violation in the standard model. We
consider classically allowed processes, i.e.~energies above the sphaleron
barrier. We develop a computational procedure that allows us to solve the Yang
Mills equations of motion for spherically symmetric configurations and to
identify the particle numbers of the in- and out-states. A stochastic sampling
technique is then used to map the region spanned by the topology changing
solutions in the energy versus incoming particle number plane and, in
particular, to determine its lower boundary. A lower boundary which approaches
small particle number would be a strong indication that baryon number violation
would occur in high energy collisions, whereas a lower asymptote at large
particle number would be evidence of the contrary. With our method and the
computational resources we have had at our disposal, we have been able to
determine the lower boundary up to energies approximately equal to one and a
half time times the sphaleron energy and observed a 40\% decrease in particle
number with no sign of the particle number leveling off. However encouraging
this may be, the decrease in incoming particle number is only from particles 50
down to approximately 30. Nevertheless, the formalism we have established will
make it possible to extend the scope of this investigation and also to study
processes in the classically forbidden region, which we plan to do in the
future.
|
[
{
"created": "Fri, 12 Jan 1996 18:37:58 GMT",
"version": "v1"
}
] |
2012-08-27
|
[
[
"Rebbi",
"Claudio",
""
],
[
"Singleton,",
"Robert",
"Jr"
]
] |
We use semiclassical methods to study processes which give rise to change of topology and therefore to baryon number violation in the standard model. We consider classically allowed processes, i.e.~energies above the sphaleron barrier. We develop a computational procedure that allows us to solve the Yang Mills equations of motion for spherically symmetric configurations and to identify the particle numbers of the in- and out-states. A stochastic sampling technique is then used to map the region spanned by the topology changing solutions in the energy versus incoming particle number plane and, in particular, to determine its lower boundary. A lower boundary which approaches small particle number would be a strong indication that baryon number violation would occur in high energy collisions, whereas a lower asymptote at large particle number would be evidence of the contrary. With our method and the computational resources we have had at our disposal, we have been able to determine the lower boundary up to energies approximately equal to one and a half time times the sphaleron energy and observed a 40\% decrease in particle number with no sign of the particle number leveling off. However encouraging this may be, the decrease in incoming particle number is only from particles 50 down to approximately 30. Nevertheless, the formalism we have established will make it possible to extend the scope of this investigation and also to study processes in the classically forbidden region, which we plan to do in the future.
|
hep-ph/9505240
|
Howard Haber
|
Howard E. Haber
|
Challenges For Non-Minimal Higgs Searches at Future Colliders
|
14 pages, PHYZZX macropackage, uses psfig for embedded figures,
postscript file of the full manuscript available via anonymous ftp at
ftp://scipp.ucsc.edu/pub/haber/bsmivheh.ps . Two postscript figure files
(tahoefig1.ps and tahoefig2.ps) also available separately at the same
location
| null | null |
CERN-TH/95-109 and SCIPP-95/15
|
hep-ph
| null |
In models with a non-minimal Higgs sector, the lightest scalar state may be a
neutral CP-even Higgs boson, whose properties are nearly identical to those of
the minimal Higgs boson of the Standard Model. In such a scenario, the other
Higgs scalars are significantly heavier than $m_Z$; their effects rapidly
decouple from the low-energy theory. The decoupling limit of the most general
CP-conserving two-Higgs doublet model is formulated. Detection of evidence for
a non-minimal Higgs sector in the decoupling limit presents a formidable
challenge for Higgs searches at future colliders.
|
[
{
"created": "Fri, 5 May 1995 15:00:01 GMT",
"version": "v1"
}
] |
2007-05-23
|
[
[
"Haber",
"Howard E.",
""
]
] |
In models with a non-minimal Higgs sector, the lightest scalar state may be a neutral CP-even Higgs boson, whose properties are nearly identical to those of the minimal Higgs boson of the Standard Model. In such a scenario, the other Higgs scalars are significantly heavier than $m_Z$; their effects rapidly decouple from the low-energy theory. The decoupling limit of the most general CP-conserving two-Higgs doublet model is formulated. Detection of evidence for a non-minimal Higgs sector in the decoupling limit presents a formidable challenge for Higgs searches at future colliders.
|
1911.10631
|
Raoul R\"ontsch
|
Matthieu Jaquier, Raoul R\"ontsch
|
Mixed scalar-pseudoscalar Higgs boson production through
next-to-next-to-leading order at the LHC
|
13 pages, 3 figures
| null |
10.1007/JHEP06(2020)005
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We study the production of a mixed scalar-pseudoscalar Higgs boson in gluon
fusion at the LHC, through next-to-next-to-leading order (NNLO) in QCD. We
obtain fully differential results, including the decay of the Higgs boson to
two charged lepton pairs. We discuss the impact of the interference between the
scalar and pseudoscalar states. We also show differential distributions for
several kinematic variables whose shape is sensitive to the parity of the Higgs
boson, and assess the impact of the NNLO QCD corrections on these shapes.
|
[
{
"created": "Sun, 24 Nov 2019 22:38:02 GMT",
"version": "v1"
}
] |
2020-06-24
|
[
[
"Jaquier",
"Matthieu",
""
],
[
"Röntsch",
"Raoul",
""
]
] |
We study the production of a mixed scalar-pseudoscalar Higgs boson in gluon fusion at the LHC, through next-to-next-to-leading order (NNLO) in QCD. We obtain fully differential results, including the decay of the Higgs boson to two charged lepton pairs. We discuss the impact of the interference between the scalar and pseudoscalar states. We also show differential distributions for several kinematic variables whose shape is sensitive to the parity of the Higgs boson, and assess the impact of the NNLO QCD corrections on these shapes.
|
hep-ph/9510284
|
Craig Roberts
|
R. Alkofer and C. D. Roberts
|
Calculation of the anomalous $\gamma \pi ^* \to \pi \pi $ form factor
|
13 Pages, 2 figures, REVTEX, uses epsfig
|
Phys.Lett.B369:101-107,1996
|
10.1016/0370-2693(95)01517-5
|
ANL-PHY-8214-TH-95, UNITU-THEP-15/1995
|
hep-ph nucl-th
| null |
The form factor for the anomalous process $\gamma \pi ^* \to \pi \pi$,
$F^{3\pi}(s,t,u)$, is calculated as a phenomenological application of the QCD
Dyson-Schwinger equations. The chiral-limit value dictated by the
electromagnetic, anomalous chiral Ward identity, $F^{3\pi}(0,0,0)= e
N_c/(12\pi^2 f_\pi^3)$, is reproduced, {\it independent} of the details of the
modelling of the gluon and quark 2-point Schwinger functions. Using a
parametrisation of the dressed $u$-$d$ quark 2-point Schwinger function that
provides a good description of pion observables, such as $\pi$-$\pi$
scattering-lengths and the electromagnetic pion form factor, $F^{3\pi}(s,t,u)$
is calculated on a kinematic range that proposed experiments plan to explore.
Our result confirms the general trend of other calculations; i.e., a monotonic
increase with $s$ at fixed $t$ and $u$, but is uniformly larger and exhibits a
more rapid rise with $s$.
|
[
{
"created": "Thu, 12 Oct 1995 23:12:35 GMT",
"version": "v1"
}
] |
2008-11-26
|
[
[
"Alkofer",
"R.",
""
],
[
"Roberts",
"C. D.",
""
]
] |
The form factor for the anomalous process $\gamma \pi ^* \to \pi \pi$, $F^{3\pi}(s,t,u)$, is calculated as a phenomenological application of the QCD Dyson-Schwinger equations. The chiral-limit value dictated by the electromagnetic, anomalous chiral Ward identity, $F^{3\pi}(0,0,0)= e N_c/(12\pi^2 f_\pi^3)$, is reproduced, {\it independent} of the details of the modelling of the gluon and quark 2-point Schwinger functions. Using a parametrisation of the dressed $u$-$d$ quark 2-point Schwinger function that provides a good description of pion observables, such as $\pi$-$\pi$ scattering-lengths and the electromagnetic pion form factor, $F^{3\pi}(s,t,u)$ is calculated on a kinematic range that proposed experiments plan to explore. Our result confirms the general trend of other calculations; i.e., a monotonic increase with $s$ at fixed $t$ and $u$, but is uniformly larger and exhibits a more rapid rise with $s$.
|
1611.04380
|
Mirko Serino
|
Andreas van Hameren, Krzysztof Kutak, Mirko Serino
|
QCD amplitudes with 2 initial spacelike legs via generalised BCFW
recursion
|
Two references and some more detailed comments added. Matched to the
version to be published in JHEP
| null | null |
IFJPAN-IV-2016-27
|
hep-ph hep-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We complete the generalisation of the BCFW recursion relation to the
off-shell case, allowing for the computation of tree level scattering
amplitudes for full High Energy Factorisation (HEF), i.e. with both incoming
partons having a non-vanishing transverse momentum. We provide explicit results
for color-ordered amplitudes with two off-shell legs in massless QCD up to 4
point, continuing the program begun in two previous papers. For the 4-fermion
amplitudes, which are not BCFW-recursible, we perform a diagrammatic
computation, so as to offer a complete set of expressions. We explicitly show
and discuss some plots of the squared $2 \rightarrow 2$ matrix elements as
functions of the differences in rapidity and azimuthal angle of the final state
particles.
|
[
{
"created": "Mon, 14 Nov 2016 13:37:57 GMT",
"version": "v1"
},
{
"created": "Tue, 31 Jan 2017 12:42:08 GMT",
"version": "v2"
},
{
"created": "Thu, 2 Feb 2017 08:59:15 GMT",
"version": "v3"
}
] |
2017-02-03
|
[
[
"van Hameren",
"Andreas",
""
],
[
"Kutak",
"Krzysztof",
""
],
[
"Serino",
"Mirko",
""
]
] |
We complete the generalisation of the BCFW recursion relation to the off-shell case, allowing for the computation of tree level scattering amplitudes for full High Energy Factorisation (HEF), i.e. with both incoming partons having a non-vanishing transverse momentum. We provide explicit results for color-ordered amplitudes with two off-shell legs in massless QCD up to 4 point, continuing the program begun in two previous papers. For the 4-fermion amplitudes, which are not BCFW-recursible, we perform a diagrammatic computation, so as to offer a complete set of expressions. We explicitly show and discuss some plots of the squared $2 \rightarrow 2$ matrix elements as functions of the differences in rapidity and azimuthal angle of the final state particles.
|
1405.2155
|
Toshitaka Tatsumi
|
T.Tatsumi, K.Nishiyama and S.Karasawa
|
Novel Lifshitz point for chiral transition in the magnetic field
|
4pages,2figures
| null |
10.1016/j.physletb.2015.02.033
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Based on the generalized Ginzburg-Landau theory, chiral phase transition is
discussed in the presence of magnetic field. Considering the chiral density
wave we show chiral anomaly gives rise to an inhomogeneous chiral phase for
nonzero quark-number chemical potential. Novel Lifshitz point appears on the
vanishing chemical potential line, which may be directly explored by the
lattice QCD simulation.
|
[
{
"created": "Fri, 9 May 2014 06:54:41 GMT",
"version": "v1"
}
] |
2015-06-19
|
[
[
"Tatsumi",
"T.",
""
],
[
"Nishiyama",
"K.",
""
],
[
"Karasawa",
"S.",
""
]
] |
Based on the generalized Ginzburg-Landau theory, chiral phase transition is discussed in the presence of magnetic field. Considering the chiral density wave we show chiral anomaly gives rise to an inhomogeneous chiral phase for nonzero quark-number chemical potential. Novel Lifshitz point appears on the vanishing chemical potential line, which may be directly explored by the lattice QCD simulation.
|
2201.02796
|
Hanzhong Zhang
|
Qing-Fei Han, Man Xie, Han-Zhong Zhang
|
Extracting the jet transport coefficient from hadron suppressions by
confronting current NLO parton fragmentation functions
|
16 pages, 21 figures
| null | null | null |
hep-ph nucl-ex nucl-th
|
http://creativecommons.org/licenses/by/4.0/
|
Nuclear modification factors of single hadrons and dihadrons at large
transverse momentum ($p_{\rm T}$) in high-energy heavy-ion collisions are
studied in a next-to-leading-order (NLO) perturbative QCD parton model. Parton
fragmentation functions (FFs) in $A+A$ collisions are modified due to jet
energy loss which is proportional to the jet transport coefficient $\hat{q}$
characterizing the interaction between the parton jet and the produced medium.
By confronting 6 current sets of NLO parton FFs for large $p_{\rm T}$ hadron
productions, we extract $\hat{q}$ quantitatively via a global fit to data for
both single hadron and dihadron suppressions, and obtain $\hat{q}/T^3 = 4.74 -
6.72$ at $T = 370$ MeV in central $Au+Au$ collisions at $\sqrt{s_{\rm NN}}=200$
GeV, and $\hat{q}/T^3 = 3.07 - 3.98$ at $T = 480$ MeV in central $Pb+Pb$
collisions at $\sqrt{s_{\rm NN}}=2.76$ TeV. The numerical results show that the
uncertainties for $\hat{q}$ extraction are brought by the different
contributions of gluon-to-hadron in the 6 sets of FFs due to gluon energy loss
being $9/4$ times of quark energy loss.
|
[
{
"created": "Sat, 8 Jan 2022 09:27:11 GMT",
"version": "v1"
}
] |
2022-01-11
|
[
[
"Han",
"Qing-Fei",
""
],
[
"Xie",
"Man",
""
],
[
"Zhang",
"Han-Zhong",
""
]
] |
Nuclear modification factors of single hadrons and dihadrons at large transverse momentum ($p_{\rm T}$) in high-energy heavy-ion collisions are studied in a next-to-leading-order (NLO) perturbative QCD parton model. Parton fragmentation functions (FFs) in $A+A$ collisions are modified due to jet energy loss which is proportional to the jet transport coefficient $\hat{q}$ characterizing the interaction between the parton jet and the produced medium. By confronting 6 current sets of NLO parton FFs for large $p_{\rm T}$ hadron productions, we extract $\hat{q}$ quantitatively via a global fit to data for both single hadron and dihadron suppressions, and obtain $\hat{q}/T^3 = 4.74 - 6.72$ at $T = 370$ MeV in central $Au+Au$ collisions at $\sqrt{s_{\rm NN}}=200$ GeV, and $\hat{q}/T^3 = 3.07 - 3.98$ at $T = 480$ MeV in central $Pb+Pb$ collisions at $\sqrt{s_{\rm NN}}=2.76$ TeV. The numerical results show that the uncertainties for $\hat{q}$ extraction are brought by the different contributions of gluon-to-hadron in the 6 sets of FFs due to gluon energy loss being $9/4$ times of quark energy loss.
|
1306.2730
|
Schoeffel Laurent
|
Laurent Schoeffel
|
Inclusive diffraction at HERA
|
10 pages, 4 figures, proceedings of the International Conference on
the Structure and the Interactions of the Photon including the 20th
International Workshop on Photon-Photon Collisions and the International
Workshop on High Energy Photon Linear Colliders, Paris, 2013
| null | null | null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
A new experimental analysis of the diffractive process $ep \rightarrow eXY$,
where $Y$ denotes a proton or its low mass excitation with $M_Y<1.6$ GeV, has
been performed with the H1 experiment at HERA \cite{Aaron:2012ad}. The main
results of this study are summarised in this document, together with the
comparisons to other measurements and theoretical predictions.
|
[
{
"created": "Wed, 12 Jun 2013 07:27:22 GMT",
"version": "v1"
}
] |
2013-06-13
|
[
[
"Schoeffel",
"Laurent",
""
]
] |
A new experimental analysis of the diffractive process $ep \rightarrow eXY$, where $Y$ denotes a proton or its low mass excitation with $M_Y<1.6$ GeV, has been performed with the H1 experiment at HERA \cite{Aaron:2012ad}. The main results of this study are summarised in this document, together with the comparisons to other measurements and theoretical predictions.
|
2110.13926
|
Yann Gouttenoire Dr
|
Iason Baldes, Yann Gouttenoire, Filippo Sala, G\'eraldine Servant
|
Supercool Composite Dark Matter Beyond 100 TeV
|
35 pages plus appendices and references, accepted for publication in
JHEP
|
JHEP 07 (2022) 084
|
10.1007/JHEP07(2022)084
|
ULB-TH/21-17; DESY 21-172
|
hep-ph astro-ph.CO
|
http://creativecommons.org/licenses/by/4.0/
|
Dark Matter could be a composite state of a confining sector with an
approximate scale symmetry. We consider the case where the associated
pseudo-Goldstone boson, the dilaton, mediates its interactions with the
Standard Model. When the confining phase transition in the early universe is
supercooled, its dynamics allows for Dark Matter masses up to $10^6$ TeV. We
derive the precise parameter space compatible with all experimental
constraints, finding that this scenario can be tested partly by telescopes and
entirely by gravitational waves.
|
[
{
"created": "Tue, 26 Oct 2021 18:00:02 GMT",
"version": "v1"
},
{
"created": "Tue, 12 Jul 2022 16:10:13 GMT",
"version": "v2"
},
{
"created": "Wed, 13 Jul 2022 19:56:13 GMT",
"version": "v3"
}
] |
2022-07-19
|
[
[
"Baldes",
"Iason",
""
],
[
"Gouttenoire",
"Yann",
""
],
[
"Sala",
"Filippo",
""
],
[
"Servant",
"Géraldine",
""
]
] |
Dark Matter could be a composite state of a confining sector with an approximate scale symmetry. We consider the case where the associated pseudo-Goldstone boson, the dilaton, mediates its interactions with the Standard Model. When the confining phase transition in the early universe is supercooled, its dynamics allows for Dark Matter masses up to $10^6$ TeV. We derive the precise parameter space compatible with all experimental constraints, finding that this scenario can be tested partly by telescopes and entirely by gravitational waves.
|
0809.2366
|
Jens Erler
|
Jens Erler
|
Electroweak Theory for the Tevatron, LHC, and ILC
|
4 pages, 2 figures, talk presented at the 34th International
Conference on High Energy Physics (ICHEP 2008),, Philadelphia, PA, July 30 -
Aug. 5, 2008; replacement using updated template for conference proceedings
(no changes)
| null | null | null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Future high precision electroweak measurements require understanding of
Standard Model expectations to multi-loop accuracy, both, for the predictions
of production cross-sections of signal and background, as well as for
pseudo-observables. I review recent results from precision calculations and
summarize projections and implications for the Tevatron, the LHC, CEBAF, and
the ILC.
|
[
{
"created": "Sat, 13 Sep 2008 20:05:16 GMT",
"version": "v1"
},
{
"created": "Mon, 13 Oct 2008 05:31:03 GMT",
"version": "v2"
}
] |
2008-10-13
|
[
[
"Erler",
"Jens",
""
]
] |
Future high precision electroweak measurements require understanding of Standard Model expectations to multi-loop accuracy, both, for the predictions of production cross-sections of signal and background, as well as for pseudo-observables. I review recent results from precision calculations and summarize projections and implications for the Tevatron, the LHC, CEBAF, and the ILC.
|
hep-ph/0512222
|
Matthias Neubert
|
Matthias Neubert (Cornell University & University of Heidelberg)
|
Effective Field Theory and Heavy Quark Physics
|
Lectures presented at TASI 2004 (39 pages)
| null |
10.1142/9789812773579_0004
|
CLNS-05/1949
|
hep-ph
| null |
These notes are based on five lectures presented at the 2004 Theoretical
Advanced Study Institute (TASI) on ``Physics in D>=4''. After a brief
motivation of flavor physics, they provide a pedagogical introduction to
effective field theory, the effective weak Lagrangian, and the technology of
renormalization-group improved perturbation theory. These general methods are
then applied in the context of heavy-quarks physics, introducing the concepts
of heavy-quark and soft-collinear effective theory.
|
[
{
"created": "Sat, 17 Dec 2005 13:27:49 GMT",
"version": "v1"
}
] |
2017-08-23
|
[
[
"Neubert",
"Matthias",
"",
"Cornell University & University of Heidelberg"
]
] |
These notes are based on five lectures presented at the 2004 Theoretical Advanced Study Institute (TASI) on ``Physics in D>=4''. After a brief motivation of flavor physics, they provide a pedagogical introduction to effective field theory, the effective weak Lagrangian, and the technology of renormalization-group improved perturbation theory. These general methods are then applied in the context of heavy-quarks physics, introducing the concepts of heavy-quark and soft-collinear effective theory.
|
hep-ph/0104187
|
Daijiro Suematsu
|
Daijiro Suematsu
|
The origin of quark and lepton mixings
|
18 pages, latex, one eps figure
|
Phys.Rev.D64:073013,2001
|
10.1103/PhysRevD.64.073013
|
KANAZAWA-01-03
|
hep-ph
| null |
We propose a model for the mass matrices of quarks and leptons based on two
Abelian flavor symmetries. One is assumed to be broken at a high energy region
near the Planck scale. It is used for the Froggatt-Nielsen mechanism in both
quark and charged lepton sectors. Another one remains unbroken to a multi-TeV
region. The mixings among neutrinos and gauginos including the one of the new
Abelian symmetry generate non-zero masses and mixings among neutrinos. A
bi-maximal scheme for the neutrino oscillation can be realized together with
suitable masses and CKM-mixings in the quark sector. FCNC constraints on this
flavor dependent Abelian symmetry seems to be evaded.
|
[
{
"created": "Thu, 19 Apr 2001 07:25:56 GMT",
"version": "v1"
}
] |
2014-11-17
|
[
[
"Suematsu",
"Daijiro",
""
]
] |
We propose a model for the mass matrices of quarks and leptons based on two Abelian flavor symmetries. One is assumed to be broken at a high energy region near the Planck scale. It is used for the Froggatt-Nielsen mechanism in both quark and charged lepton sectors. Another one remains unbroken to a multi-TeV region. The mixings among neutrinos and gauginos including the one of the new Abelian symmetry generate non-zero masses and mixings among neutrinos. A bi-maximal scheme for the neutrino oscillation can be realized together with suitable masses and CKM-mixings in the quark sector. FCNC constraints on this flavor dependent Abelian symmetry seems to be evaded.
|
1906.09087
|
Kazem Azizi
|
K. Azizi, N. Er
|
Effects of a dense medium on parameters of doubly heavy baryons
|
16 Pages, 4 Figures and 4 Tables, Accepted Version
|
Phys. Rev. D 100, 074004 (2019)
|
10.1103/PhysRevD.100.074004
| null |
hep-ph hep-ex nucl-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
The spectroscopic properties of the doubly heavy spin-$1/2$ baryons
$\Xi_{QQ'}$, $\Xi'_{QQ'}$, $\Omega_{QQ'}$ and $\Omega'_{QQ'}$, with heavy
quarks $Q$ and $Q'$ being $b$ or/and $c$, are investigated in cold nuclear
matter. In particular, the behavior of the mass of these particles with respect
to the density of the medium in the range $\rho\in [0,1.4] ~\rho_{sat}$, with
$\rho_{sat}=0.11^3 ~GeV^3$ being the saturation density of nuclear matter, is
investigated. From the shifts in the mass and vector self energy of the states
under consideration, it is obtained that $\Xi_{QQ'}$ and $\Xi'_{QQ'}$ baryons
with two heavy quarks and one $u$ or $d$ quark are affected by the medium,
considerably. It is also seen that the $\Omega_{QQ'}$ and $\Omega'_{QQ'}$
states, containing two heavy quarks and one $s$ quark do not see the dense
medium, at all. The value of mass for the $\Xi_{cc}$ state obtained at
$\rho\rightarrow 0$ limit is nicely consistent with the experimental data. Our
results on parameters of other members can be useful in the search for these
states. The obtained results may also shed light on the future in-medium
experiments aiming to search for the behavior of the doubly heavy baryons under
extreme conditions.
|
[
{
"created": "Fri, 21 Jun 2019 12:10:55 GMT",
"version": "v1"
},
{
"created": "Tue, 24 Sep 2019 15:33:23 GMT",
"version": "v2"
},
{
"created": "Tue, 1 Oct 2019 17:02:35 GMT",
"version": "v3"
}
] |
2019-10-16
|
[
[
"Azizi",
"K.",
""
],
[
"Er",
"N.",
""
]
] |
The spectroscopic properties of the doubly heavy spin-$1/2$ baryons $\Xi_{QQ'}$, $\Xi'_{QQ'}$, $\Omega_{QQ'}$ and $\Omega'_{QQ'}$, with heavy quarks $Q$ and $Q'$ being $b$ or/and $c$, are investigated in cold nuclear matter. In particular, the behavior of the mass of these particles with respect to the density of the medium in the range $\rho\in [0,1.4] ~\rho_{sat}$, with $\rho_{sat}=0.11^3 ~GeV^3$ being the saturation density of nuclear matter, is investigated. From the shifts in the mass and vector self energy of the states under consideration, it is obtained that $\Xi_{QQ'}$ and $\Xi'_{QQ'}$ baryons with two heavy quarks and one $u$ or $d$ quark are affected by the medium, considerably. It is also seen that the $\Omega_{QQ'}$ and $\Omega'_{QQ'}$ states, containing two heavy quarks and one $s$ quark do not see the dense medium, at all. The value of mass for the $\Xi_{cc}$ state obtained at $\rho\rightarrow 0$ limit is nicely consistent with the experimental data. Our results on parameters of other members can be useful in the search for these states. The obtained results may also shed light on the future in-medium experiments aiming to search for the behavior of the doubly heavy baryons under extreme conditions.
|
2002.05917
|
Toshitaka Tatsumi
|
Toshitaka Tatsumi, Hiroaki Abuki
|
Transport properties in magnetized compact stars
|
10 pages, submitted to "Symmetry"
| null | null | null |
hep-ph nucl-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Transport properties of dense QCD matter is discussed. Using the Kubo formula
for conductivity, we discuss some topological aspects of quark matter during
chiral transition. The close relation to Weyl semimetal is pointed out and
anomalous Hall effect is demonstrated to be possible there. In particular, it
is shown that the spectral asymmetry of the quasi-particles plays an important
role for the Hall conductivity in the magnetic field.
|
[
{
"created": "Fri, 14 Feb 2020 08:37:37 GMT",
"version": "v1"
}
] |
2020-02-17
|
[
[
"Tatsumi",
"Toshitaka",
""
],
[
"Abuki",
"Hiroaki",
""
]
] |
Transport properties of dense QCD matter is discussed. Using the Kubo formula for conductivity, we discuss some topological aspects of quark matter during chiral transition. The close relation to Weyl semimetal is pointed out and anomalous Hall effect is demonstrated to be possible there. In particular, it is shown that the spectral asymmetry of the quasi-particles plays an important role for the Hall conductivity in the magnetic field.
|
1708.05995
|
Aparajita Bhattacharya
|
A. Bhattacharya, S. Pal, R. Ghosh, B.Chakrabarti
|
Fermi Liquid Model for Hadrons in Medium
|
18 pages, 14 figures
| null | null | null |
hep-ph nucl-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
A Fermi liquid model for hadrons has been suggested for the hadrons in
medium. The hadrons are supposed to behave like quasi particle as Fermi
excitation while in the medium and the effective mass of the hadrons have been
estimated using Fermi liquid model. Considering a momentum dependent potential
inside the medium to describe the interaction, the effective masses of the
hadrons are estimated. The temperature dependence of effective masses has also
been studied. The possibility of describing masses of the quarks as Fermi
excitation has been investigated. Compressibility, specific heats, density of
states in medium has been studied. The potential depth for light and singly
heavy baryons in medium has been extracted. The results are found to be very
interesting and compared with the other studies available in literature.
|
[
{
"created": "Sun, 20 Aug 2017 17:08:02 GMT",
"version": "v1"
}
] |
2017-08-22
|
[
[
"Bhattacharya",
"A.",
""
],
[
"Pal",
"S.",
""
],
[
"Ghosh",
"R.",
""
],
[
"Chakrabarti",
"B.",
""
]
] |
A Fermi liquid model for hadrons has been suggested for the hadrons in medium. The hadrons are supposed to behave like quasi particle as Fermi excitation while in the medium and the effective mass of the hadrons have been estimated using Fermi liquid model. Considering a momentum dependent potential inside the medium to describe the interaction, the effective masses of the hadrons are estimated. The temperature dependence of effective masses has also been studied. The possibility of describing masses of the quarks as Fermi excitation has been investigated. Compressibility, specific heats, density of states in medium has been studied. The potential depth for light and singly heavy baryons in medium has been extracted. The results are found to be very interesting and compared with the other studies available in literature.
|
0707.4543
|
Seung Woo Ham
|
S.W. Ham, J.O. Im, and S.K. OH
|
Electroweak phase transition in the MNMSSM with explicit CP violation
|
21 pages, 4 figures
| null | null | null |
hep-ph
| null |
In explicit CP violation scenario of the minimal non-minimal supersymmetric
standard model (MNMSSM), the possibility of a strongly first-order electroweak
phase transition (EWPT) is investigated at the one-loop level, where the
radiative corrections from the loops of the top and stop quarks are taken into
account. Assuming that the stop quark masses are not degenerate, the radiative
corrections due to the stop quarks give rise to a CP phase, which triggers the
scalar-pseudoscalar mixing in the Higgs sector of the MNMSSM. The lighter stop
quark need not always to have a small mass in order to ensure the strongly
first-order EWPT. In the MNMSSM with explicit CP violation, it is found that
the strength of the first-order EWPT depends on several factors, such as the
lightest neutral Higgs boson mass and the nontrivial CP phase arising from stop
quark masses. The effects of these factors are discussed.
|
[
{
"created": "Tue, 31 Jul 2007 06:34:23 GMT",
"version": "v1"
}
] |
2007-08-01
|
[
[
"Ham",
"S. W.",
""
],
[
"Im",
"J. O.",
""
],
[
"OH",
"S. K.",
""
]
] |
In explicit CP violation scenario of the minimal non-minimal supersymmetric standard model (MNMSSM), the possibility of a strongly first-order electroweak phase transition (EWPT) is investigated at the one-loop level, where the radiative corrections from the loops of the top and stop quarks are taken into account. Assuming that the stop quark masses are not degenerate, the radiative corrections due to the stop quarks give rise to a CP phase, which triggers the scalar-pseudoscalar mixing in the Higgs sector of the MNMSSM. The lighter stop quark need not always to have a small mass in order to ensure the strongly first-order EWPT. In the MNMSSM with explicit CP violation, it is found that the strength of the first-order EWPT depends on several factors, such as the lightest neutral Higgs boson mass and the nontrivial CP phase arising from stop quark masses. The effects of these factors are discussed.
|
hep-ph/0504236
|
Rabindra N. Mohapatra
|
R. N. Mohapatra, M. K. Parida and G. Rajasekaran
|
Radiative Magnification of Neutrino Mixings in Split Supersymmetry
|
11 pages and 5 figures, references updated and better figures
included
|
Phys.Rev. D72 (2005) 013002
|
10.1103/PhysRevD.72.013002
|
UMD-PP-05-044, NEHU/PHY-MP-02/05, IMSc/2005/04/09
|
hep-ph
| null |
Radiative corrections to neutrino mixings in seesaw models depend on the
nature of new physics between the weak and the GUT-seesaw scales and can be
taken into account using the renormalization group equations. This new physics
effect becomes particularly important for models with quasi-degenerate neutrino
masses where small neutrino mixings at the seesaw scale can get magnified by
radiative renormalization effects alone to match observations. This mechanism
of radiative magnification which provides a simple understanding of why lepton
mixings are so different from quark mixings was demonstrated by us for the
standard supersymmetry scenario where the particle spectrum becomes
supersymmetric above the weak scale. In this paper, we examine this phenomenon
in split supersymmetry scenarios and find that the mechanism works also for
this scenario provided the SUSY scale is at least 2-3 orders below the
GUT-seesaw scale and one has larger values of ${\tan\beta}$.
|
[
{
"created": "Tue, 26 Apr 2005 10:30:28 GMT",
"version": "v1"
},
{
"created": "Fri, 29 Apr 2005 13:23:32 GMT",
"version": "v2"
}
] |
2016-09-06
|
[
[
"Mohapatra",
"R. N.",
""
],
[
"Parida",
"M. K.",
""
],
[
"Rajasekaran",
"G.",
""
]
] |
Radiative corrections to neutrino mixings in seesaw models depend on the nature of new physics between the weak and the GUT-seesaw scales and can be taken into account using the renormalization group equations. This new physics effect becomes particularly important for models with quasi-degenerate neutrino masses where small neutrino mixings at the seesaw scale can get magnified by radiative renormalization effects alone to match observations. This mechanism of radiative magnification which provides a simple understanding of why lepton mixings are so different from quark mixings was demonstrated by us for the standard supersymmetry scenario where the particle spectrum becomes supersymmetric above the weak scale. In this paper, we examine this phenomenon in split supersymmetry scenarios and find that the mechanism works also for this scenario provided the SUSY scale is at least 2-3 orders below the GUT-seesaw scale and one has larger values of ${\tan\beta}$.
|
1506.07399
|
Gergely Fejos
|
G. Fejos
|
Functional dependence of axial anomaly via mesonic fluctuations in the
three flavor linear sigma model
|
10 pages, 3 figures, minor changes, Published in Phys. Rev. D
|
Phys. Rev. D 92, 036011 (2015)
|
10.1103/PhysRevD.92.036011
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Temperature dependence of the $U_A(1)$ anomaly is investigated by taking into
account mesonic fluctuations in the $U(3)\times U(3)$ linear sigma model. A
field dependent anomaly coefficient function of the effective potential is
calculated within the finite temperature functional renormalization group
approach. The applied approximation scheme is a generalization of the chiral
invariant expansion technique developed in [G. Fejos, Phys. Rev. D 90, 096011
(2014)]. We provide an analytic expression and also numerical evidence that
depending on the relationship between the two quartic couplings, mesonic
fluctuations can either strengthen of weaken the anomaly as a function of the
temperature. The role of the six-point invariant of the $U(3)\times U(3)$
group, and therefore the stability of the chiral expansion is also discussed in
detail.
|
[
{
"created": "Wed, 24 Jun 2015 14:47:41 GMT",
"version": "v1"
},
{
"created": "Mon, 29 Jun 2015 07:07:32 GMT",
"version": "v2"
},
{
"created": "Mon, 31 Aug 2015 08:34:08 GMT",
"version": "v3"
}
] |
2015-09-02
|
[
[
"Fejos",
"G.",
""
]
] |
Temperature dependence of the $U_A(1)$ anomaly is investigated by taking into account mesonic fluctuations in the $U(3)\times U(3)$ linear sigma model. A field dependent anomaly coefficient function of the effective potential is calculated within the finite temperature functional renormalization group approach. The applied approximation scheme is a generalization of the chiral invariant expansion technique developed in [G. Fejos, Phys. Rev. D 90, 096011 (2014)]. We provide an analytic expression and also numerical evidence that depending on the relationship between the two quartic couplings, mesonic fluctuations can either strengthen of weaken the anomaly as a function of the temperature. The role of the six-point invariant of the $U(3)\times U(3)$ group, and therefore the stability of the chiral expansion is also discussed in detail.
|
hep-ph/0306030
|
Adam Szczepaniak
|
Adam P. Szczepaniak
|
Confinement and gluon propagator in Coulomb gauge QCD
|
Corrected problems with printing, reference added
|
Phys.Rev. D69 (2004) 074031
|
10.1103/PhysRevD.69.074031
| null |
hep-ph
| null |
We consider the effects of the Faddeev-Popov determinant in the Coulomb gauge
on the confinement properties of the QCD vacuum. We show that the the
determinant is needed to regularize the otherwise divergent functional
integrals near the Gribov horizon but still enables large field configurations
to generate IR enhanced running coupling. The physical gluon propagator is
found to be strongly suppressed in the
IR consistent with expectations from lattice gauge calculations.
|
[
{
"created": "Tue, 3 Jun 2003 16:47:13 GMT",
"version": "v1"
},
{
"created": "Mon, 30 Jun 2003 17:19:23 GMT",
"version": "v2"
}
] |
2016-09-06
|
[
[
"Szczepaniak",
"Adam P.",
""
]
] |
We consider the effects of the Faddeev-Popov determinant in the Coulomb gauge on the confinement properties of the QCD vacuum. We show that the the determinant is needed to regularize the otherwise divergent functional integrals near the Gribov horizon but still enables large field configurations to generate IR enhanced running coupling. The physical gluon propagator is found to be strongly suppressed in the IR consistent with expectations from lattice gauge calculations.
|
2306.03128
|
Rotem Ovadia
|
Patrick J. Fitzpatrick, Yonit Hochberg, Eric Kuflik, Rotem Ovadia and
Yotam Soreq
|
Dark Matter Through the Axion-Gluon Portal
|
16 pages, two columns, 5 figures
| null | null | null |
hep-ph
|
http://creativecommons.org/licenses/by/4.0/
|
Axion-like-particles are a well-motivated extension of the Standard Model
that can mediate interactions between the dark matter and ordinary matter. Here
we consider an axion portal between the two sectors, where the axion couples to
dark matter and to QCD gluons. We establish the relevant processes of interest
across the scales of dark matter and axion masses and couplings, identify the
distinct mechanisms that control the dark matter relic abundance in each case,
and extract the resulting experimental signatures of the gluonic axion portal
to dark matter.
|
[
{
"created": "Mon, 5 Jun 2023 18:00:01 GMT",
"version": "v1"
}
] |
2023-06-07
|
[
[
"Fitzpatrick",
"Patrick J.",
""
],
[
"Hochberg",
"Yonit",
""
],
[
"Kuflik",
"Eric",
""
],
[
"Ovadia",
"Rotem",
""
],
[
"Soreq",
"Yotam",
""
]
] |
Axion-like-particles are a well-motivated extension of the Standard Model that can mediate interactions between the dark matter and ordinary matter. Here we consider an axion portal between the two sectors, where the axion couples to dark matter and to QCD gluons. We establish the relevant processes of interest across the scales of dark matter and axion masses and couplings, identify the distinct mechanisms that control the dark matter relic abundance in each case, and extract the resulting experimental signatures of the gluonic axion portal to dark matter.
|
hep-ph/0605147
|
Petr Benes
|
Petr Benes, Tomas Brauner, Jiri Hosek
|
Dynamical breakdown of Abelian gauge chiral symmetry by strong Yukawa
interactions
|
11 pages, REVTeX4, 10 eps figures; additional remarks and references
added; version published in Phys. Rev. D
|
Phys.Rev.D75:056003,2007
|
10.1103/PhysRevD.75.056003
| null |
hep-ph
| null |
We consider a model with anomaly-free Abelian gauge axial-vector symmetry,
which is intended to mimic the standard electroweak gauge chiral SU(2)_L x
U(1)_Y theory. Within this model we demonstrate: (1) Strong Yukawa interactions
between massless fermion fields and a massive scalar field carrying the axial
charge generate dynamically the fermion and boson proper self-energies, which
are ultraviolet-finite and chirally noninvariant. (2) Solutions of the
underlying Schwinger-Dyson equations found numerically exhibit a huge
amplification of the fermion mass ratios as a response to mild changes of the
ratios of the Yukawa couplings. (3) The `would-be' Nambu-Goldstone boson is a
composite of both the fermion and scalar fields, and it gives rise to the mass
of the axial-vector gauge boson. (4) Spontaneous breakdown of the gauge
symmetry further manifests by mass splitting of the complex scalar and by new
symmetry-breaking vertices, generated at one loop. In particular, we work out
in detail the cubic vertex of the Abelian gauge boson.
|
[
{
"created": "Fri, 12 May 2006 11:38:48 GMT",
"version": "v1"
},
{
"created": "Fri, 19 Jan 2007 20:19:26 GMT",
"version": "v2"
},
{
"created": "Wed, 21 Mar 2007 13:19:37 GMT",
"version": "v3"
}
] |
2008-11-26
|
[
[
"Benes",
"Petr",
""
],
[
"Brauner",
"Tomas",
""
],
[
"Hosek",
"Jiri",
""
]
] |
We consider a model with anomaly-free Abelian gauge axial-vector symmetry, which is intended to mimic the standard electroweak gauge chiral SU(2)_L x U(1)_Y theory. Within this model we demonstrate: (1) Strong Yukawa interactions between massless fermion fields and a massive scalar field carrying the axial charge generate dynamically the fermion and boson proper self-energies, which are ultraviolet-finite and chirally noninvariant. (2) Solutions of the underlying Schwinger-Dyson equations found numerically exhibit a huge amplification of the fermion mass ratios as a response to mild changes of the ratios of the Yukawa couplings. (3) The `would-be' Nambu-Goldstone boson is a composite of both the fermion and scalar fields, and it gives rise to the mass of the axial-vector gauge boson. (4) Spontaneous breakdown of the gauge symmetry further manifests by mass splitting of the complex scalar and by new symmetry-breaking vertices, generated at one loop. In particular, we work out in detail the cubic vertex of the Abelian gauge boson.
|
hep-ph/9612354
|
Glennys Farrar
|
Glennys R. Farrar (Rutgers Univ.)
|
Determining the Gluonic Content of Isoscalar Mesons
|
Invited talk ICHEP96, Warsaw, Poland, July 29, 1996 based on work
done in collaboration with M. B. Cakir, F. E. Close and Z. P. Li
| null | null |
RU-96-92
|
hep-ph
| null |
The gluonic widths of four leading glueball candidates are determined from
their production in radiative quarkonium decays, allowing quantitative
estimation of their glue content. Lattice predictions for the scalar and tensor
channels seem to be in reasonable agareement with present data (allowing for
mixing with $q \bar{q}$ states). However there is a glueball-like-state in the
pseudoscalar spectrum whose mass is considerably lower than expected from
lattice estimates.
|
[
{
"created": "Fri, 13 Dec 1996 18:25:23 GMT",
"version": "v1"
}
] |
2007-05-23
|
[
[
"Farrar",
"Glennys R.",
"",
"Rutgers Univ."
]
] |
The gluonic widths of four leading glueball candidates are determined from their production in radiative quarkonium decays, allowing quantitative estimation of their glue content. Lattice predictions for the scalar and tensor channels seem to be in reasonable agareement with present data (allowing for mixing with $q \bar{q}$ states). However there is a glueball-like-state in the pseudoscalar spectrum whose mass is considerably lower than expected from lattice estimates.
|
hep-ph/9706486
|
Stephane Peigne
|
Paul Hoyer and Stephane Peigne
|
Rescattering Effects in Quarkonium Production
|
30 pages, Latex
|
Phys.Rev. D57 (1998) 1864-1877
|
10.1103/PhysRevD.57.1864
|
NORDITA-97/37 P
|
hep-ph
| null |
We study eta_c and J/psi hadroproduction induced by multiple scattering off
fixed centres in the target. We determine the minimum number of hard
scatterings required and show that additional soft scatterings may be
factorized, at the level of the production amplitude for the eta_c and of the
cross section for the J/psi. The J/psi provides an interesting example of soft
rescattering effects occurring inside a hard vertex. We also explain the
qualitative difference between the transverse momentum broadening of the J/psi
and of the Upsilon observed in collisions on nuclei. We point out that
rescattering from spectators produced by beam and target parton evolution may
have important effects in J/psi production.
|
[
{
"created": "Tue, 24 Jun 1997 14:09:15 GMT",
"version": "v1"
},
{
"created": "Mon, 17 Nov 1997 12:40:27 GMT",
"version": "v2"
}
] |
2009-10-30
|
[
[
"Hoyer",
"Paul",
""
],
[
"Peigne",
"Stephane",
""
]
] |
We study eta_c and J/psi hadroproduction induced by multiple scattering off fixed centres in the target. We determine the minimum number of hard scatterings required and show that additional soft scatterings may be factorized, at the level of the production amplitude for the eta_c and of the cross section for the J/psi. The J/psi provides an interesting example of soft rescattering effects occurring inside a hard vertex. We also explain the qualitative difference between the transverse momentum broadening of the J/psi and of the Upsilon observed in collisions on nuclei. We point out that rescattering from spectators produced by beam and target parton evolution may have important effects in J/psi production.
|
2010.07240
|
Ningqiang Song
|
Amit Bhoonah, Joseph Bramante, Sarah Schon, Ningqiang Song
|
Detecting Composite Dark Matter with Long Range and Contact Interactions
in Gas Clouds
|
18 pages, 2 figures, matched published version
|
Phys. Rev. D 103, 123026 (2021)
|
10.1103/PhysRevD.103.123026
| null |
hep-ph astro-ph.GA
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Cold interstellar gas clouds provide an exciting new method to discover dark
matter. Their immense size makes them uniquely sensitive to interactions from
the heaviest, most rarefied dark matter models. Using gas cloud observations,
we derive constraints on heavy composite dark matter coupled to the Standard
Model through a light dark photon for dark matter up to a thousand solar
masses. We find gas clouds are also sensitive to very large composite dark
matter that interacts with nuclei through a fixed contact interaction cross
section. We also study the contact interaction model and implement multiscatter
and overburden analyses to obtain bounds from experiments like CDMS, CRESST,
DAMA, XQC, and XENON1T.
|
[
{
"created": "Wed, 14 Oct 2020 16:59:20 GMT",
"version": "v1"
},
{
"created": "Mon, 28 Jun 2021 16:04:47 GMT",
"version": "v2"
}
] |
2021-07-07
|
[
[
"Bhoonah",
"Amit",
""
],
[
"Bramante",
"Joseph",
""
],
[
"Schon",
"Sarah",
""
],
[
"Song",
"Ningqiang",
""
]
] |
Cold interstellar gas clouds provide an exciting new method to discover dark matter. Their immense size makes them uniquely sensitive to interactions from the heaviest, most rarefied dark matter models. Using gas cloud observations, we derive constraints on heavy composite dark matter coupled to the Standard Model through a light dark photon for dark matter up to a thousand solar masses. We find gas clouds are also sensitive to very large composite dark matter that interacts with nuclei through a fixed contact interaction cross section. We also study the contact interaction model and implement multiscatter and overburden analyses to obtain bounds from experiments like CDMS, CRESST, DAMA, XQC, and XENON1T.
|
hep-ph/0005314
|
Fujita
|
T. Asaga (Nihon U. and MPI), T. Fujita and M. Hiramoto (Nihon U.)
|
EDM operator free from Schiff's theorem
|
23 pages, Prog. Theor. Phys. in press
| null |
10.1143/PTP.106.1223
| null |
hep-ph
| null |
We present generalized Schiff's transformation on electric dipole moments
(EDM) in quantum field theory. By the unitary transformation, the time and
parity violating interaction $i{ge\over 2} \bar \psi \sigma_{\mu \nu} \gamma_5
\psi F^{\mu \nu}$ is transformed into a new form, but its nonrelativistic
reduction has a unique form, which is free from Schiff's theorem. The
relativistic corrections to the new EDM operator turn out to be a small
increase to the EDM as given by $b_2 (\alpha Z)^2$ with $b_2 \simeq 2 $.
Therefore, the calculation of the EDM with nonrelativistic Hartree-Fock wave
functions presents the most conservative but reliable estimation for the
enhancement factor of the EDM in atoms.
|
[
{
"created": "Wed, 31 May 2000 08:25:32 GMT",
"version": "v1"
},
{
"created": "Mon, 5 Nov 2001 08:31:31 GMT",
"version": "v2"
}
] |
2009-10-31
|
[
[
"Asaga",
"T.",
"",
"Nihon U. and MPI"
],
[
"Fujita",
"T.",
"",
"Nihon U."
],
[
"Hiramoto",
"M.",
"",
"Nihon U."
]
] |
We present generalized Schiff's transformation on electric dipole moments (EDM) in quantum field theory. By the unitary transformation, the time and parity violating interaction $i{ge\over 2} \bar \psi \sigma_{\mu \nu} \gamma_5 \psi F^{\mu \nu}$ is transformed into a new form, but its nonrelativistic reduction has a unique form, which is free from Schiff's theorem. The relativistic corrections to the new EDM operator turn out to be a small increase to the EDM as given by $b_2 (\alpha Z)^2$ with $b_2 \simeq 2 $. Therefore, the calculation of the EDM with nonrelativistic Hartree-Fock wave functions presents the most conservative but reliable estimation for the enhancement factor of the EDM in atoms.
|
2111.02247
|
Luiz Lopes
|
Luiz L. Lopes, Debora P. Menezes
|
On the nature of the mass-gap object in the GW190814 event
|
15 pages, 11 figures, 6 tables
|
Astrophys.J. 936 , 41 (2022)
|
10.3847/1538-4357/ac81c4
| null |
hep-ph astro-ph.HE nucl-th
|
http://creativecommons.org/licenses/by/4.0/
|
In this work, we make a very extensive study on the conditions that allow the
mass-gap object in the GW190814 event to be faced as a degenerate star instead
of a black hole. We begin revisiting some parametrizations of the Quantum
Hadrodynamics (QHD) and then study under which conditions the hyperons are
present in such a massive star. Afterward, using a vector MIT based model, we
study if self-bound quark stars, satisfying the Bodmer-Witten conjecture
fulfill all the observational constraints. Finally, we study hybrid stars
within a Maxwell construction and check for what values of the bag, as well as
the vector interaction, a quark core star with only nucleons, and with nucleons
admixed with hyperons can reach at least 2.50 M$_\odot$. We conclude that,
depending on the choice of parameters, none of the possibilities can be
completely ruled out, i.e., the mass-gap object can be a hadronic (either
nucleonic or hyperonic), a quark, or a hybrid star.
However, some cases are more probable than others.
|
[
{
"created": "Wed, 3 Nov 2021 14:26:34 GMT",
"version": "v1"
},
{
"created": "Mon, 16 May 2022 20:12:16 GMT",
"version": "v2"
}
] |
2022-09-07
|
[
[
"Lopes",
"Luiz L.",
""
],
[
"Menezes",
"Debora P.",
""
]
] |
In this work, we make a very extensive study on the conditions that allow the mass-gap object in the GW190814 event to be faced as a degenerate star instead of a black hole. We begin revisiting some parametrizations of the Quantum Hadrodynamics (QHD) and then study under which conditions the hyperons are present in such a massive star. Afterward, using a vector MIT based model, we study if self-bound quark stars, satisfying the Bodmer-Witten conjecture fulfill all the observational constraints. Finally, we study hybrid stars within a Maxwell construction and check for what values of the bag, as well as the vector interaction, a quark core star with only nucleons, and with nucleons admixed with hyperons can reach at least 2.50 M$_\odot$. We conclude that, depending on the choice of parameters, none of the possibilities can be completely ruled out, i.e., the mass-gap object can be a hadronic (either nucleonic or hyperonic), a quark, or a hybrid star. However, some cases are more probable than others.
|
hep-ph/0307262
|
Alan D. Martin
|
A.D. Martin, R.G. Roberts, W.J. Stirling and R.S. Thorne
|
MRST partons and uncertainties
|
6 pages, 2 figures, 2 tables. Contribution to XI International
Workshop on Deep Inelastic Scattering, St. Petersburg, 23-27 April 2003
| null | null |
IPPP/03/43, DCPT/03/86, Cavendish-HEP-2003/13
|
hep-ph
| null |
We discuss uncertainties in the extraction of parton distributions from
global analyses of DIS and related data. We present conservative sets of
partons, at both NLO and NNLO, which are stable to x,Q^2,W^2 cuts on the data.
We give the corresponding values of alpha(M_Z^2) and the cross sections for W
production at the Tevatron.
|
[
{
"created": "Mon, 21 Jul 2003 14:31:03 GMT",
"version": "v1"
}
] |
2007-05-23
|
[
[
"Martin",
"A. D.",
""
],
[
"Roberts",
"R. G.",
""
],
[
"Stirling",
"W. J.",
""
],
[
"Thorne",
"R. S.",
""
]
] |
We discuss uncertainties in the extraction of parton distributions from global analyses of DIS and related data. We present conservative sets of partons, at both NLO and NNLO, which are stable to x,Q^2,W^2 cuts on the data. We give the corresponding values of alpha(M_Z^2) and the cross sections for W production at the Tevatron.
|
1303.0208
|
Veronica Sanz
|
John Ellis, Veronica Sanz and Tevong You
|
Associated Production Evidence against Higgs Impostors and Anomalous
Couplings
|
15 pages, 7 figures
| null |
10.1140/epjc/s10052-013-2507-6
|
KCL-PH-TH/2013-06, LCTS/2013-03, CERN-PH-TH/2013-017
|
hep-ph hep-ex
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
There is still no proof that the new particle $X$ recently discovered by the
ATLAS and CMS Collaborations indeed has spin zero and positive parity, as
confidently expected. We show here that the energy dependence of associated
$W/Z + X$ production would be much less for a $J^P = 0^+$ boson with minimal
couplings, such as the Higgs boson of the Standard Model, than for a spin-two
particle with graviton-like couplings or a spin-zero boson with non-minimal
couplings. The $W/Z + (X \to {\bar b}b)$ signal apparently observed by the CDF
and D0 Collaborations can be used to predict the cross section for the same
signal at the LHC that should be measured under the spin-two and different
spin-zero hypotheses. The spin-two prediction exceeds by an order of magnitude
the upper limits established by the ATLAS and CMS Collaborations, which are
consistent with the minimal $0^+$ prediction, thereby providing {\it secunda
facie} evidence against spin-two Higgs impostors. Similar analyses of energy
dependences provide evidence against $0^-$ impostors, non-minimal scalar boson
couplings, including the best LHC limits on dimension-six operators. Comparing
the LHC vector boson fusion cross sections at 7 and 8 TeV in the centre of mass
provides additional but weaker evidence in favour of the identification of the
$X$ particle as a $J^P = 0^+$ boson with minimal couplings.
|
[
{
"created": "Fri, 1 Mar 2013 16:12:53 GMT",
"version": "v1"
}
] |
2015-06-15
|
[
[
"Ellis",
"John",
""
],
[
"Sanz",
"Veronica",
""
],
[
"You",
"Tevong",
""
]
] |
There is still no proof that the new particle $X$ recently discovered by the ATLAS and CMS Collaborations indeed has spin zero and positive parity, as confidently expected. We show here that the energy dependence of associated $W/Z + X$ production would be much less for a $J^P = 0^+$ boson with minimal couplings, such as the Higgs boson of the Standard Model, than for a spin-two particle with graviton-like couplings or a spin-zero boson with non-minimal couplings. The $W/Z + (X \to {\bar b}b)$ signal apparently observed by the CDF and D0 Collaborations can be used to predict the cross section for the same signal at the LHC that should be measured under the spin-two and different spin-zero hypotheses. The spin-two prediction exceeds by an order of magnitude the upper limits established by the ATLAS and CMS Collaborations, which are consistent with the minimal $0^+$ prediction, thereby providing {\it secunda facie} evidence against spin-two Higgs impostors. Similar analyses of energy dependences provide evidence against $0^-$ impostors, non-minimal scalar boson couplings, including the best LHC limits on dimension-six operators. Comparing the LHC vector boson fusion cross sections at 7 and 8 TeV in the centre of mass provides additional but weaker evidence in favour of the identification of the $X$ particle as a $J^P = 0^+$ boson with minimal couplings.
|
hep-ph/0110120
|
Harald Anlauf
|
H. Anlauf (Darmstadt)
|
Deep Inelastic Scattering with Tagged Initial State Radiation: Complete
O(alpha) leptonic QED Corrections
|
21 pages, LaTeX2e, 2 figures. Corrected typos in eqs. (10),(18)
|
Eur.Phys.J.C22:627-635,2002
|
10.1007/s100520100834
|
IKDA-01/22, SI-2001-7
|
hep-ph
| null |
In this paper we extend the calculation of the QED corrections to deep
inelastic lepton-proton scattering with a tagged photon, taking into account
the full corrections on the lepton side. Comparing to previous results that
were obtained by considering only large logarithmic terms at leading and
next-to-leading accuray, we find that the difference is in general quite small,
however, it may be significant in the region of large $y$ and small $x$.
|
[
{
"created": "Tue, 9 Oct 2001 11:10:54 GMT",
"version": "v1"
},
{
"created": "Thu, 28 Nov 2002 21:20:53 GMT",
"version": "v2"
}
] |
2011-09-13
|
[
[
"Anlauf",
"H.",
"",
"Darmstadt"
]
] |
In this paper we extend the calculation of the QED corrections to deep inelastic lepton-proton scattering with a tagged photon, taking into account the full corrections on the lepton side. Comparing to previous results that were obtained by considering only large logarithmic terms at leading and next-to-leading accuray, we find that the difference is in general quite small, however, it may be significant in the region of large $y$ and small $x$.
|
1510.00170
|
Carsten Rott
|
Carsten Rott, Seongjin In, Jason Kumar, David Yaylali
|
Dark Matter Searches for Monoenergetic Neutrinos Arising from Stopped
Meson Decay in the Sun
|
10 pages, 3 figures
|
JCAP11(2015)039
|
10.1088/1475-7516/2015/11/039
|
UH511-1249-15, CETUP2015-020
|
hep-ph astro-ph.HE
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Dark matter can be gravitationally captured by the Sun after scattering off
solar nuclei. Annihilations of the dark matter trapped and accumulated in the
centre of the Sun could result in one of the most detectable and recognizable
signals for dark matter. Searches for high-energy neutrinos produced in the
decay of annihilation products have yielded extremely competitive constraints
on the spin-dependent scattering cross sections of dark matter with nuclei.
Recently, the low energy neutrino signal arising from dark-matter annihilation
to quarks which then hadronize and shower has been suggested as a competitive
and complementary search strategy. These high-multiplicity hadronic showers
give rise to a large amount of pions which will come to rest in the Sun and
decay, leading to a unique sub-GeV neutrino signal. We here improve on previous
works by considering the monoenergetic neutrino signal arising from both pion
and kaon decay. We consider searches at liquid scintillation, liquid argon, and
water Cherenkov detectors and find very competitive sensitivities for few-GeV
dark matter masses.
|
[
{
"created": "Thu, 1 Oct 2015 10:13:32 GMT",
"version": "v1"
},
{
"created": "Wed, 25 Nov 2015 13:45:13 GMT",
"version": "v2"
}
] |
2015-11-26
|
[
[
"Rott",
"Carsten",
""
],
[
"In",
"Seongjin",
""
],
[
"Kumar",
"Jason",
""
],
[
"Yaylali",
"David",
""
]
] |
Dark matter can be gravitationally captured by the Sun after scattering off solar nuclei. Annihilations of the dark matter trapped and accumulated in the centre of the Sun could result in one of the most detectable and recognizable signals for dark matter. Searches for high-energy neutrinos produced in the decay of annihilation products have yielded extremely competitive constraints on the spin-dependent scattering cross sections of dark matter with nuclei. Recently, the low energy neutrino signal arising from dark-matter annihilation to quarks which then hadronize and shower has been suggested as a competitive and complementary search strategy. These high-multiplicity hadronic showers give rise to a large amount of pions which will come to rest in the Sun and decay, leading to a unique sub-GeV neutrino signal. We here improve on previous works by considering the monoenergetic neutrino signal arising from both pion and kaon decay. We consider searches at liquid scintillation, liquid argon, and water Cherenkov detectors and find very competitive sensitivities for few-GeV dark matter masses.
|
hep-ph/0506303
|
Eugene Zabrodin
|
E. Zabrodin, L. Bravina, G. Burau, J. Bleibel, C. Fuchs, Amand
Faessler
|
Anisotropic flow of strange particles at RHIC
|
proceedings of the conference SQM2004 (September 2004, Cape Town,
South Africa)
|
J.Phys. G31 (2005) S995-S999
|
10.1088/0954-3899/31/6/045
| null |
hep-ph nucl-ex nucl-th
| null |
Space-time picture of the anisotropic flow evolution in Au+Au collisions at
BNL RHIC is studied for strange hadrons within the microscopic quark-gluon
string model. The directed flow of both mesons and hyperons demonstrates wiggle
structure with the universal antiflow slope at |y| < 2 for minimum bias events.
This effect increases as the reaction becomes more peripheral. The development
of both components of the anisotropic flow is closely related to particle
freeze-out. Hadrons are emitted continuously, and different hadronic species
are decoupled from the system at different times. These hadrons contribute
differently to the formation and evolution of the elliptic flow, which can be
decomposed onto three components: (i) flow created by hadrons emitted from the
surface at the onset of the collision; (ii) flow produced by jets; (iii)
hydrodynamic flow. Due to these features, the general trend in elliptic flow
formation is that the earlier mesons are frozen, the weaker their elliptic
flow. In contrast, baryons frozen at the end of the system evolution have
stronger v2.
|
[
{
"created": "Wed, 29 Jun 2005 11:25:38 GMT",
"version": "v1"
}
] |
2009-11-11
|
[
[
"Zabrodin",
"E.",
""
],
[
"Bravina",
"L.",
""
],
[
"Burau",
"G.",
""
],
[
"Bleibel",
"J.",
""
],
[
"Fuchs",
"C.",
""
],
[
"Faessler",
"Amand",
""
]
] |
Space-time picture of the anisotropic flow evolution in Au+Au collisions at BNL RHIC is studied for strange hadrons within the microscopic quark-gluon string model. The directed flow of both mesons and hyperons demonstrates wiggle structure with the universal antiflow slope at |y| < 2 for minimum bias events. This effect increases as the reaction becomes more peripheral. The development of both components of the anisotropic flow is closely related to particle freeze-out. Hadrons are emitted continuously, and different hadronic species are decoupled from the system at different times. These hadrons contribute differently to the formation and evolution of the elliptic flow, which can be decomposed onto three components: (i) flow created by hadrons emitted from the surface at the onset of the collision; (ii) flow produced by jets; (iii) hydrodynamic flow. Due to these features, the general trend in elliptic flow formation is that the earlier mesons are frozen, the weaker their elliptic flow. In contrast, baryons frozen at the end of the system evolution have stronger v2.
|
2311.17412
|
Y. M. Cho
|
Liping Zou, Pengming Zhang, Yongmin Cho
|
Electroweak Strings in the Standard Model
| null | null | null | null |
hep-ph
|
http://creativecommons.org/licenses/by/4.0/
|
We argue that the existence of the electroweak monopole predicts the
existence of the electroweak string in the standard model made of
monopole-antimonopole pair separated infinitely apart, which carry the
quantized magnetic flux $4 \pi n/e$. We show how to construct such quantized
magnetic flux string solution. Our result strongly indicates that genuine
fundamental electromagnetic string could exist in nature which could actually
be detected. We discuss the physical implications of our result in cosmology.
|
[
{
"created": "Wed, 29 Nov 2023 07:35:55 GMT",
"version": "v1"
}
] |
2023-11-30
|
[
[
"Zou",
"Liping",
""
],
[
"Zhang",
"Pengming",
""
],
[
"Cho",
"Yongmin",
""
]
] |
We argue that the existence of the electroweak monopole predicts the existence of the electroweak string in the standard model made of monopole-antimonopole pair separated infinitely apart, which carry the quantized magnetic flux $4 \pi n/e$. We show how to construct such quantized magnetic flux string solution. Our result strongly indicates that genuine fundamental electromagnetic string could exist in nature which could actually be detected. We discuss the physical implications of our result in cosmology.
|
hep-ph/9710540
|
Nikolai Kochelev
|
N.I.Kochelev
|
Instantons, Spin Crisis and High $Q^2$ Anomaly at HERA
|
9 pages, Latex, 3 figures. To appear in Proc. Workshop ``Physics with
Polarized Protons at HERA'' August 1997,DESY-Zeuthen
| null | null | null |
hep-ph
| null |
The contribution of the nonperturbative quark-gluon interaction induced by
the instantons to $g_1^p(x,Q^2)$ and $F_2^p(x,Q^2)$ structure functions is
estimated. It is shown that nontrivial $Q^2$ dependence of the instanton
contribution to $g_1^p(x,Q^2)$ allows us to explain the observed decreasing of
the part of the proton spin carried by quarks without involving a large
positive gluon polarization. It is demonstrated that the anomalous enhancement
of the instanton contribution to $F_2^p(x,Q^2)$ structure function, due to
multiple emission of the gluons from instanton vertex, can be one of the
reasons for the excess of the DIS events at HERA at high $Q^2 $ and $x$.
|
[
{
"created": "Thu, 30 Oct 1997 09:45:40 GMT",
"version": "v1"
},
{
"created": "Mon, 10 Nov 1997 16:51:50 GMT",
"version": "v2"
}
] |
2007-05-23
|
[
[
"Kochelev",
"N. I.",
""
]
] |
The contribution of the nonperturbative quark-gluon interaction induced by the instantons to $g_1^p(x,Q^2)$ and $F_2^p(x,Q^2)$ structure functions is estimated. It is shown that nontrivial $Q^2$ dependence of the instanton contribution to $g_1^p(x,Q^2)$ allows us to explain the observed decreasing of the part of the proton spin carried by quarks without involving a large positive gluon polarization. It is demonstrated that the anomalous enhancement of the instanton contribution to $F_2^p(x,Q^2)$ structure function, due to multiple emission of the gluons from instanton vertex, can be one of the reasons for the excess of the DIS events at HERA at high $Q^2 $ and $x$.
|
hep-ph/0606243
|
Nelson V. Cortez
|
J. E. Cieza Montalvo, Nelson V. Cortez, J. Sa Borges and Mauro D.
Tonasse
|
Searching for doubly charged Higgs bosons at the LHC in a 3-3-1 Model
|
19 pages, 3 figures
|
Nucl.Phys.B756:1-15,2006; Erratum-ibid.B796:422-423,2008
|
10.1016/j.nuclphysb.2006.08.013 10.1016/j.nuclphysb.2008.01.003
| null |
hep-ph
| null |
Using a peculiar version of the SU(3)L x U(1)N electroweak model, we
investigate the production of doubly charged Higgs boson at the Large Hadron
Collider. Our results include branching ratio calculations for the doubly
charged Higgs and for one of the neutral scalar bosons of the model.
|
[
{
"created": "Thu, 22 Jun 2006 13:29:44 GMT",
"version": "v1"
},
{
"created": "Fri, 23 Jun 2006 10:54:53 GMT",
"version": "v2"
},
{
"created": "Tue, 19 Sep 2006 14:50:51 GMT",
"version": "v3"
}
] |
2008-11-26
|
[
[
"Montalvo",
"J. E. Cieza",
""
],
[
"Cortez",
"Nelson V.",
""
],
[
"Borges",
"J. Sa",
""
],
[
"Tonasse",
"Mauro D.",
""
]
] |
Using a peculiar version of the SU(3)L x U(1)N electroweak model, we investigate the production of doubly charged Higgs boson at the Large Hadron Collider. Our results include branching ratio calculations for the doubly charged Higgs and for one of the neutral scalar bosons of the model.
|
hep-ph/0511142
|
Petr Zavada
|
Petr Zavada
|
Spin of the proton and orbital motion of quarks
|
6 pages, 1 figure, Presented at the Workshop Nucleon05, Frascati
12-14Oct. 2005
| null | null | null |
hep-ph
| null |
Effect of the quark intrinsic motion on the proton spin structure functions
is demonstrated. It is shown, that the covariant version of the quark-parton
model taking into account the orbital motion gives the consistent picture of
the proton spin structure, which is based on the valence quarks. This picture
is supported by the recent data, which indicate, that the spin contributions
from the sea quarks and gluons are compatible with zero.
|
[
{
"created": "Fri, 11 Nov 2005 12:06:14 GMT",
"version": "v1"
}
] |
2007-05-23
|
[
[
"Zavada",
"Petr",
""
]
] |
Effect of the quark intrinsic motion on the proton spin structure functions is demonstrated. It is shown, that the covariant version of the quark-parton model taking into account the orbital motion gives the consistent picture of the proton spin structure, which is based on the valence quarks. This picture is supported by the recent data, which indicate, that the spin contributions from the sea quarks and gluons are compatible with zero.
|
2008.04727
|
Levan Chotorlishvili L
|
P. Kurashvili, L. Chotorlishvili, K. A. Kouzakov, A. I. Studenikin
|
Coherence and mixedness of neutrino oscillations in a magnetic field
| null | null |
10.1140/epjc/s10052-021-09039-2
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
The radical departure from classical physics implies quantum coherence, i.e.,
coherent superposition of eigenstates of Hermitian operators with a discrete
spectrum. In resource theory, quantum coherence is a resource for quantum
operations. Typically the stochastic phenomenon induces decoherence effects.
However, in the present work, we prove that nonunitary evolution leads to the
generation of quantum coherence in some cases. Specifically, we consider the
neutrino propagation in the dissipative environment, namely in a magnetic field
with a stochastic component, and focus on neutrino flavor, spin and spin-flavor
oscillations. We present exact analytical results for quantum coherence in
neutrino oscillations quantified in terms of the relative entropy. Starting
from an initial zero coherence state, we observe persistent oscillations of
coherence during the dissipative evolution. We found that after dissipative
evolution, the initial spin-polarized state entirely thermalizes, and in the
final steady state, the spin-up/down states have the same probabilities. On the
other hand, neutrino flavor states also thermalize, byt the populations of two
flavor states do not equate to each other. The initial flavor still dominates
in the final steady state
|
[
{
"created": "Tue, 11 Aug 2020 14:42:15 GMT",
"version": "v1"
}
] |
2021-05-05
|
[
[
"Kurashvili",
"P.",
""
],
[
"Chotorlishvili",
"L.",
""
],
[
"Kouzakov",
"K. A.",
""
],
[
"Studenikin",
"A. I.",
""
]
] |
The radical departure from classical physics implies quantum coherence, i.e., coherent superposition of eigenstates of Hermitian operators with a discrete spectrum. In resource theory, quantum coherence is a resource for quantum operations. Typically the stochastic phenomenon induces decoherence effects. However, in the present work, we prove that nonunitary evolution leads to the generation of quantum coherence in some cases. Specifically, we consider the neutrino propagation in the dissipative environment, namely in a magnetic field with a stochastic component, and focus on neutrino flavor, spin and spin-flavor oscillations. We present exact analytical results for quantum coherence in neutrino oscillations quantified in terms of the relative entropy. Starting from an initial zero coherence state, we observe persistent oscillations of coherence during the dissipative evolution. We found that after dissipative evolution, the initial spin-polarized state entirely thermalizes, and in the final steady state, the spin-up/down states have the same probabilities. On the other hand, neutrino flavor states also thermalize, byt the populations of two flavor states do not equate to each other. The initial flavor still dominates in the final steady state
|
2009.00865
|
Ushak Rahaman
|
Rambabu Korrapati, Jai More, Ushak Rahaman, S. Uma Sankar
|
Signatures of $A_4$ symmetry in the charged lepton flavour violating
decays in a neutrino mass model
|
18 pages, Accepted in EPJC
| null |
10.1140/epjc/s10052-021-09171-z
| null |
hep-ph hep-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We study the charged lepton flavour violation in a popular neutrino mass
model with $A_4$ discrete symmetry. This symmetry requires the presence of
multiple Higgs doublets in the model and it also dictates the flavour violating
Yukawa couplings of the additional neutral scalars of the model. Such couplings
lead to the decays of the neutral mesons, the top quark and the $\tau$ lepton
into charged leptons of different flavours at tree level. The $A_4$ symmetry of
the model leads to certain characteristic signatures in these decays. We
discuss these signatures and predict the rates for the most favourable charged
lepton flavour violating modes.
|
[
{
"created": "Wed, 2 Sep 2020 07:32:53 GMT",
"version": "v1"
},
{
"created": "Thu, 10 Sep 2020 19:24:17 GMT",
"version": "v2"
},
{
"created": "Fri, 23 Apr 2021 10:24:07 GMT",
"version": "v3"
}
] |
2021-05-19
|
[
[
"Korrapati",
"Rambabu",
""
],
[
"More",
"Jai",
""
],
[
"Rahaman",
"Ushak",
""
],
[
"Sankar",
"S. Uma",
""
]
] |
We study the charged lepton flavour violation in a popular neutrino mass model with $A_4$ discrete symmetry. This symmetry requires the presence of multiple Higgs doublets in the model and it also dictates the flavour violating Yukawa couplings of the additional neutral scalars of the model. Such couplings lead to the decays of the neutral mesons, the top quark and the $\tau$ lepton into charged leptons of different flavours at tree level. The $A_4$ symmetry of the model leads to certain characteristic signatures in these decays. We discuss these signatures and predict the rates for the most favourable charged lepton flavour violating modes.
|
hep-ph/0012329
|
Muneyuki Ishida
|
Shin Ishida (Nihon U.), Muneyuki Ishida (TITech) and Tomohito Maeda
(Nihon U.)
|
Covariant Level-Classification Scheme and Chiral Symmetry
|
proc. of ``Possible Existence of sigma-Meson and Its Implication to
Hadron Physics," YITP, Kyoto, June 12--14, 2000. 6 pages, uses ptptex.sty
| null | null | null |
hep-ph
| null |
Starting from the bi-local Klein-Gordon Equation with spin-independent
squared-mass operator, we give a covariant quark representation of general
composite meson systems with definite Lorentz transformation properties. For
benefit of this representation we are able to deduce automatically the
transformation rules of composite mesons for general symmetry operations from
those of constituent (exciton) quarks. Applying this we investigate especially
physical implication of chiral symmetry for the meson systems, and present a
covariant level-classification scheme, leading to a possible existence of new
meson multiplets of "chiralons."
|
[
{
"created": "Sat, 23 Dec 2000 14:02:17 GMT",
"version": "v1"
}
] |
2007-05-23
|
[
[
"Ishida",
"Shin",
"",
"Nihon U."
],
[
"Ishida",
"Muneyuki",
"",
"TITech"
],
[
"Maeda",
"Tomohito",
"",
"Nihon U."
]
] |
Starting from the bi-local Klein-Gordon Equation with spin-independent squared-mass operator, we give a covariant quark representation of general composite meson systems with definite Lorentz transformation properties. For benefit of this representation we are able to deduce automatically the transformation rules of composite mesons for general symmetry operations from those of constituent (exciton) quarks. Applying this we investigate especially physical implication of chiral symmetry for the meson systems, and present a covariant level-classification scheme, leading to a possible existence of new meson multiplets of "chiralons."
|
hep-ph/9306221
|
Evalyn Gates
|
R. R. Caldwell and E.Gates
|
Constraints on Cosmic Strings due to Black Holes Formed from Collapsed
Cosmic String Loops
|
(Plain Tex, uses tables.tex -- wrapped lines corrected), 11 pages,
FERMILAB-Pub-93/137-A
|
Phys.Rev.D48:2581-2586,1993
|
10.1103/PhysRevD.48.2581
| null |
hep-ph astro-ph gr-qc
| null |
The cosmological features of primordial black holes formed from collapsed
cosmic string loops are studied. Observational restrictions on a population of
primordial black holes are used to restrict $f$, the fraction of cosmic string
loops which collapse to form black holes, and $\mu$, the cosmic string
mass-per-unit-length. Using a realistic model of cosmic strings, we find the
strongest restriction on the parameters $f$ and $\mu$ is due to the energy
density in $100 MeV$ photons radiated by the black holes. We also find that
inert black hole remnants cannot serve as the dark matter. If earlier, crude
estimates of $f$ are reliable, our results severely restrict $\mu$, and
therefore limit the viability of the cosmic string large-scale structure
scenario.
|
[
{
"created": "Thu, 3 Jun 1993 22:16:43 GMT",
"version": "v1"
}
] |
2008-11-26
|
[
[
"Caldwell",
"R. R.",
""
],
[
"Gates",
"E.",
""
]
] |
The cosmological features of primordial black holes formed from collapsed cosmic string loops are studied. Observational restrictions on a population of primordial black holes are used to restrict $f$, the fraction of cosmic string loops which collapse to form black holes, and $\mu$, the cosmic string mass-per-unit-length. Using a realistic model of cosmic strings, we find the strongest restriction on the parameters $f$ and $\mu$ is due to the energy density in $100 MeV$ photons radiated by the black holes. We also find that inert black hole remnants cannot serve as the dark matter. If earlier, crude estimates of $f$ are reliable, our results severely restrict $\mu$, and therefore limit the viability of the cosmic string large-scale structure scenario.
|
2004.05786
|
Xianhui Zhong
|
Qi Li, Long-Cheng Gui, Ming-Sheng Liu, Qi-Fang L\"u, Xian-Hui Zhong
|
Mass spectrum and strong decays of strangeonium in a constituent quark
model
|
33 pages, 18 tables, typo in Table X is corrected
|
Chin.Phys. C45 (2021) no.2, 023116
|
10.1088/1674-1137/abcf22
| null |
hep-ph hep-ex
|
http://creativecommons.org/licenses/by/4.0/
|
In this work we calculate the mass spectrum of strangeonium up to the $3D$
multiplet within a nonrelativistic linear potential quark model. Furthermore,
using the obtained wave functions, we also evaluate the strong decays of the
strangeonium states with the $^3P_0$ model. Based on our successful
explanations of the well established states $\phi(1020)$, $\phi(1680)$,
$h_1(1415)$, $f'_2(1525)$, and $\phi_3(1850)$, we further discuss the possible
assignments of strangeonium-like states from experiments by combining our
theoretical results with the observations. It is found that some resonances,
such as $f_2(2010)$ and $f_2(2150)$ listed by the Particle Data Group, and
$X(2062)$ and $X(2500)$ newly observed by BESIII, may be interpreted as the
strangeonium states. The possibility of $\phi(2170)$ as a candidate for
$\phi(3S)$ or $\phi(2D)$ cannot be excluded. We expect our results to provide
useful references for looking for the missing $s\bar{s}$ states in future
experiments.
|
[
{
"created": "Mon, 13 Apr 2020 06:33:22 GMT",
"version": "v1"
},
{
"created": "Tue, 5 May 2020 12:28:19 GMT",
"version": "v2"
},
{
"created": "Tue, 17 Nov 2020 12:42:49 GMT",
"version": "v3"
},
{
"created": "Wed, 12 May 2021 03:06:29 GMT",
"version": "v4"
}
] |
2021-05-13
|
[
[
"Li",
"Qi",
""
],
[
"Gui",
"Long-Cheng",
""
],
[
"Liu",
"Ming-Sheng",
""
],
[
"Lü",
"Qi-Fang",
""
],
[
"Zhong",
"Xian-Hui",
""
]
] |
In this work we calculate the mass spectrum of strangeonium up to the $3D$ multiplet within a nonrelativistic linear potential quark model. Furthermore, using the obtained wave functions, we also evaluate the strong decays of the strangeonium states with the $^3P_0$ model. Based on our successful explanations of the well established states $\phi(1020)$, $\phi(1680)$, $h_1(1415)$, $f'_2(1525)$, and $\phi_3(1850)$, we further discuss the possible assignments of strangeonium-like states from experiments by combining our theoretical results with the observations. It is found that some resonances, such as $f_2(2010)$ and $f_2(2150)$ listed by the Particle Data Group, and $X(2062)$ and $X(2500)$ newly observed by BESIII, may be interpreted as the strangeonium states. The possibility of $\phi(2170)$ as a candidate for $\phi(3S)$ or $\phi(2D)$ cannot be excluded. We expect our results to provide useful references for looking for the missing $s\bar{s}$ states in future experiments.
|
hep-ph/9812290
|
John Terning
|
Markus A. Luty and John Terning
|
Improved Single Sector Supersymmetry Breaking
|
34 pages, LaTeX2e
|
Phys.Rev.D62:075006,2000
|
10.1103/PhysRevD.62.075006
|
UMDHEP 99-68, UCB-PTH-98/60, LBNL-42601
|
hep-ph
| null |
Building on recent work by N. Arkani-Hamed and the present authors, we
construct realistic models that break supersymmetry dynamically and give rise
to composite quarks and leptons, all in a single strongly-coupled sector. The
most important improvement compared to earlier models is that the
second-generation composite states correspond to dimension-2 "meson" operators
in the ultraviolet. This leads to a higher scale for flavor physics, and gives
a completely natural suppression of flavor-changing neutral currents. We also
construct models in which the hierarchy of Yukawa couplings is explained by the
dimensionality of composite states. These models provide an interesting and
viable alternative to gravity- and gauge-mediated models. The generic
signatures are unification of scalar masses with different quantum numbers at
the compositeness scale, and lighter gaugino, Higgsino, and third-generation
squark and slepton masses. We also analyze large classes of models that give
rise to both compositeness and supersymmetry breaking, based on gauge theories
with confining, fixed-point, or free-magnetic dynamics.
|
[
{
"created": "Wed, 9 Dec 1998 23:35:37 GMT",
"version": "v1"
}
] |
2014-11-17
|
[
[
"Luty",
"Markus A.",
""
],
[
"Terning",
"John",
""
]
] |
Building on recent work by N. Arkani-Hamed and the present authors, we construct realistic models that break supersymmetry dynamically and give rise to composite quarks and leptons, all in a single strongly-coupled sector. The most important improvement compared to earlier models is that the second-generation composite states correspond to dimension-2 "meson" operators in the ultraviolet. This leads to a higher scale for flavor physics, and gives a completely natural suppression of flavor-changing neutral currents. We also construct models in which the hierarchy of Yukawa couplings is explained by the dimensionality of composite states. These models provide an interesting and viable alternative to gravity- and gauge-mediated models. The generic signatures are unification of scalar masses with different quantum numbers at the compositeness scale, and lighter gaugino, Higgsino, and third-generation squark and slepton masses. We also analyze large classes of models that give rise to both compositeness and supersymmetry breaking, based on gauge theories with confining, fixed-point, or free-magnetic dynamics.
|
hep-ph/0507313
|
Marc Sher
|
Erin De Pree and Marc Sher (William and Mary)
|
Kaluza-Klein Mesons in Universal Extra Dimensions
|
One paragraph regarding KK-meson annihilation added. Version to
appear in Physical Review D
|
Phys.Rev. D72 (2005) 097701
|
10.1103/PhysRevD.72.097701
|
WM-05-116
|
hep-ph
| null |
In models with universal extra dimensions, the isosinglet Kaluza-Klein (KK)
quarks, q^1, have very narrow widths, of O(5-10) MeV, and will thus hadronize.
Studies of KK-quarkonia, \bar{q}^1 q^1, show very sharp resonances and dramatic
signatures at the Linear Collider. In this Brief Report, we consider the
possibility of detecting KK-mesons, \bar{q}^1 q, and show that detection at a
Linear Collider is unlikely.
|
[
{
"created": "Wed, 27 Jul 2005 15:28:34 GMT",
"version": "v1"
},
{
"created": "Wed, 19 Oct 2005 19:50:57 GMT",
"version": "v2"
}
] |
2009-11-11
|
[
[
"De Pree",
"Erin",
"",
"William and Mary"
],
[
"Sher",
"Marc",
"",
"William and Mary"
]
] |
In models with universal extra dimensions, the isosinglet Kaluza-Klein (KK) quarks, q^1, have very narrow widths, of O(5-10) MeV, and will thus hadronize. Studies of KK-quarkonia, \bar{q}^1 q^1, show very sharp resonances and dramatic signatures at the Linear Collider. In this Brief Report, we consider the possibility of detecting KK-mesons, \bar{q}^1 q, and show that detection at a Linear Collider is unlikely.
|
2102.08367
|
Sunniva Jacobsen
|
Sunniva Jacobsen, Katherine Freese, Chris Kelso, Pearl Sandick,
Patrick Stengel
|
Inelastic dark matter scattering off Thallium cannot save DAMA
|
Added references in sections 1 and 2. Added a comment on the recent
results from ANAIS-112
| null |
10.1088/1475-7516/2021/10/070
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We study the compatibility of the observed DAMA modulation signal with
inelastic scattering of dark matter (DM) off of the $0.1\%$ Thallium (Tl)
dopant in DAMA. In this work we test whether there exist regions of parameter
space where the Tl interpretation gives a good fit to the most recent data from
DAMA, and whether these regions are compatible with the latest constraints from
other direct detection experiments. Previously, Chang et al. in 2010, had
proposed the Tl interpretation of the DAMA data, and more recently (in 2019)
the DAMA/LIBRA collaboration found regions in parameter space of Tl inelastic
scattering that differ by more than $10\sigma$ from a no modulation hypothesis.
We have expanded upon their work by testing whether the regions of parameter
space where inelastic DM-Tl scattering gives a good fit to the most recent DAMA
data survive the constraints placed by the lack of a DM signal in XENON1T and
CRESST-II. In addition, we have tested how these regions change with the main
sources of uncertainty: the Tl quenching factor, which has never been measured
directly, and the astrophysical uncertainties in the DM distribution. We
conclude that inelastic DM scattering off Tl cannot explain the DAMA data in
light of null results from other experiments.
|
[
{
"created": "Tue, 16 Feb 2021 18:53:06 GMT",
"version": "v1"
},
{
"created": "Wed, 17 Mar 2021 15:39:45 GMT",
"version": "v2"
}
] |
2021-11-03
|
[
[
"Jacobsen",
"Sunniva",
""
],
[
"Freese",
"Katherine",
""
],
[
"Kelso",
"Chris",
""
],
[
"Sandick",
"Pearl",
""
],
[
"Stengel",
"Patrick",
""
]
] |
We study the compatibility of the observed DAMA modulation signal with inelastic scattering of dark matter (DM) off of the $0.1\%$ Thallium (Tl) dopant in DAMA. In this work we test whether there exist regions of parameter space where the Tl interpretation gives a good fit to the most recent data from DAMA, and whether these regions are compatible with the latest constraints from other direct detection experiments. Previously, Chang et al. in 2010, had proposed the Tl interpretation of the DAMA data, and more recently (in 2019) the DAMA/LIBRA collaboration found regions in parameter space of Tl inelastic scattering that differ by more than $10\sigma$ from a no modulation hypothesis. We have expanded upon their work by testing whether the regions of parameter space where inelastic DM-Tl scattering gives a good fit to the most recent DAMA data survive the constraints placed by the lack of a DM signal in XENON1T and CRESST-II. In addition, we have tested how these regions change with the main sources of uncertainty: the Tl quenching factor, which has never been measured directly, and the astrophysical uncertainties in the DM distribution. We conclude that inelastic DM scattering off Tl cannot explain the DAMA data in light of null results from other experiments.
|
1912.02052
|
Shireen Gangal
|
Ashutosh Kumar Alok, Amol Dighe, Shireen Gangal, Dinesh Kumar
|
Predictions for $B_s \to \bar{K}^* \ell \,\ell$ in non-universal $Z'$
models
|
17 pages, 10 figures, journal version
|
Eur. Phys. J. C (2020) 80: 682
|
10.1140/epjc/s10052-020-8232-z
|
TIFR/TH/19-41
|
hep-ph hep-ex
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
The lepton flavor universality violating (LFUV) measurements $R_K$ and
$R_{K^*}$ in $B$ meson decays can be accounted for in non-universal $Z'$
models. We constrain the couplings of these $Z'$ models by performing a global
fit to correlated $b \to s \ell \ell$ and $b \to d \ell \ell $ processes, and
calculate their possible implications for $B_s \to \bar{K}^*\ell \ell$
observables. For real new physics (NP) couplings, the 1-$\sigma$ favored
parameters allow the corresponding LFUV ratio $R_{K^*}^{(s)}$ in $B_s \to
\bar{K}^*\ell \ell$ to range between 0.8 -- 1.2 at low $q^2$. Complex NP
couplings improve the best fit only marginally, however they allow a
significant enhancement of the branching ratio, while increasing the range of
$R_{K^*}^{(s)}$ at low $q^2$ to 0.8 -- 1.8. We find that NP could cause
zero-crossing in the forward-backward asymmetry $A_{FB}$ to shift towards lower
$q^2$ values, and enhancement in the magnitude of integrated $A_{FB}$. The $CP$
asymmetry $A_{CP}$ may be suppressed and even change sign. The simultaneous
measurements of integrated $R_{K^*}^{(s)}$ and $A_{CP}$ values to 0.1 and 1%
respectively, would help in constraining the effective NP Wilson coefficient
$C_9$ in $ b \to d \mu \mu$ interactions.
|
[
{
"created": "Wed, 4 Dec 2019 15:24:21 GMT",
"version": "v1"
},
{
"created": "Wed, 29 Jul 2020 12:02:00 GMT",
"version": "v2"
}
] |
2020-07-30
|
[
[
"Alok",
"Ashutosh Kumar",
""
],
[
"Dighe",
"Amol",
""
],
[
"Gangal",
"Shireen",
""
],
[
"Kumar",
"Dinesh",
""
]
] |
The lepton flavor universality violating (LFUV) measurements $R_K$ and $R_{K^*}$ in $B$ meson decays can be accounted for in non-universal $Z'$ models. We constrain the couplings of these $Z'$ models by performing a global fit to correlated $b \to s \ell \ell$ and $b \to d \ell \ell $ processes, and calculate their possible implications for $B_s \to \bar{K}^*\ell \ell$ observables. For real new physics (NP) couplings, the 1-$\sigma$ favored parameters allow the corresponding LFUV ratio $R_{K^*}^{(s)}$ in $B_s \to \bar{K}^*\ell \ell$ to range between 0.8 -- 1.2 at low $q^2$. Complex NP couplings improve the best fit only marginally, however they allow a significant enhancement of the branching ratio, while increasing the range of $R_{K^*}^{(s)}$ at low $q^2$ to 0.8 -- 1.8. We find that NP could cause zero-crossing in the forward-backward asymmetry $A_{FB}$ to shift towards lower $q^2$ values, and enhancement in the magnitude of integrated $A_{FB}$. The $CP$ asymmetry $A_{CP}$ may be suppressed and even change sign. The simultaneous measurements of integrated $R_{K^*}^{(s)}$ and $A_{CP}$ values to 0.1 and 1% respectively, would help in constraining the effective NP Wilson coefficient $C_9$ in $ b \to d \mu \mu$ interactions.
|
1810.07912
|
HongWei Ke
|
Hong-Wei Ke and Xue-Qian Li
|
Study on the strong decays of $\phi(2170)$ and a grand expectation for
the future charm-tau factory
|
5 pages, 3 figures and 1 table
|
Phys. Rev. D 99, 036014 (2019)
|
10.1103/PhysRevD.99.036014
| null |
hep-ph hep-ex
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
The present data imply that $\phi(2170)$ may not be an excited state of
$\phi$, but is a four quark state with $ss\bar s \bar s$ constituents.
Furthermore, there are no two mesons of $s\bar s$ available to form a molecule
which fits the mass spectrum of $\phi(2170)$, thus we suggest it should be an
$ss\bar s \bar s$ tetraquark state. In this scenario, we estimate its decay
rates through the fall-apart mechanism. Our theoretical estimates indicate that
its main decay modes should be $\phi(2170)$ into $\phi f_0(980)$, $ h_1\eta$, $
h_1\eta'$, $K_1(1270)K$ and $K_1(1400)K$. Under this hypothesis the modes
$\phi(2170)\to K^*(890)^0\bar K^*(890)^0$, $K^+K^-$ and $K^0_LK^0_S$ should be
relatively suppressed. Since the width of $h_1$ is rather large, at present it
is hard to gain precise data on $BR(\phi(2170)\to h_1\eta)$ and
$BR(\phi(2170)\to h_1\eta')$ whose measurements may be crucial for drawing a
definite conclusion about the inner assignment of $\phi(2170)$. We lay our
expectation to the proposed charm-tau factory which will have much larger
luminosity and better capacities.
|
[
{
"created": "Thu, 18 Oct 2018 06:20:10 GMT",
"version": "v1"
},
{
"created": "Tue, 23 Oct 2018 14:33:54 GMT",
"version": "v2"
}
] |
2019-02-27
|
[
[
"Ke",
"Hong-Wei",
""
],
[
"Li",
"Xue-Qian",
""
]
] |
The present data imply that $\phi(2170)$ may not be an excited state of $\phi$, but is a four quark state with $ss\bar s \bar s$ constituents. Furthermore, there are no two mesons of $s\bar s$ available to form a molecule which fits the mass spectrum of $\phi(2170)$, thus we suggest it should be an $ss\bar s \bar s$ tetraquark state. In this scenario, we estimate its decay rates through the fall-apart mechanism. Our theoretical estimates indicate that its main decay modes should be $\phi(2170)$ into $\phi f_0(980)$, $ h_1\eta$, $ h_1\eta'$, $K_1(1270)K$ and $K_1(1400)K$. Under this hypothesis the modes $\phi(2170)\to K^*(890)^0\bar K^*(890)^0$, $K^+K^-$ and $K^0_LK^0_S$ should be relatively suppressed. Since the width of $h_1$ is rather large, at present it is hard to gain precise data on $BR(\phi(2170)\to h_1\eta)$ and $BR(\phi(2170)\to h_1\eta')$ whose measurements may be crucial for drawing a definite conclusion about the inner assignment of $\phi(2170)$. We lay our expectation to the proposed charm-tau factory which will have much larger luminosity and better capacities.
|
2404.04354
|
Kazem Azizi
|
S. S. Agaev, K. Azizi, H. Sundu
|
Parameters of the tensor tetraquark $bb\overline{c}\overline{c}$
|
9 Pages and 5 Figures
| null | null | null |
hep-ph hep-ex hep-lat
|
http://creativecommons.org/licenses/by/4.0/
|
The mass and width of the tensor tetraquark $T=bb\overline{c}\overline{c}$
with spin-parity $J^{\mathrm{P}}=2^{+}$ are calculated in the context of the
QCD sum rule method. The tetraquark $T$ is modeled as a diquark-antidiquark
state built of components $b^{T}C\gamma _{\mu }b$ and $\overline{c}\gamma _{\nu
}C\overline{c}^{T}$ with $C$ being the charge conjugation matrix. The mass
$m=(12.795\pm 0.095)~\mathrm{GeV}$ of the exotic tensor meson $T$ is found by
means of the two-point sum rule approach. Its full width $\Gamma$ is evaluated
by considering processes $T \to B_{c}^{-}B_{c}^{-}$, $ B_{c}^{-}B_{c}^{\ast
-}$, and $B_{c}^{\ast -}B_{c}^{\ast -}$. Partial widths of these decays are
computed by means of the three-point sum rule approach which is used to
determine the strong couplings at relevant tetraquark-meson-meson vertices.
Predictions obtained for the width $\Gamma
_{\mathrm{T}}=55.5_{-9.9}^{+10.6}~\mathrm{MeV}$, as well as the mass of the
tetraquark $T $ can be useful in investigations of fully heavy four-quark
mesons.
|
[
{
"created": "Fri, 5 Apr 2024 18:49:04 GMT",
"version": "v1"
},
{
"created": "Thu, 2 May 2024 07:14:06 GMT",
"version": "v2"
},
{
"created": "Fri, 19 Jul 2024 19:14:33 GMT",
"version": "v3"
}
] |
2024-07-23
|
[
[
"Agaev",
"S. S.",
""
],
[
"Azizi",
"K.",
""
],
[
"Sundu",
"H.",
""
]
] |
The mass and width of the tensor tetraquark $T=bb\overline{c}\overline{c}$ with spin-parity $J^{\mathrm{P}}=2^{+}$ are calculated in the context of the QCD sum rule method. The tetraquark $T$ is modeled as a diquark-antidiquark state built of components $b^{T}C\gamma _{\mu }b$ and $\overline{c}\gamma _{\nu }C\overline{c}^{T}$ with $C$ being the charge conjugation matrix. The mass $m=(12.795\pm 0.095)~\mathrm{GeV}$ of the exotic tensor meson $T$ is found by means of the two-point sum rule approach. Its full width $\Gamma$ is evaluated by considering processes $T \to B_{c}^{-}B_{c}^{-}$, $ B_{c}^{-}B_{c}^{\ast -}$, and $B_{c}^{\ast -}B_{c}^{\ast -}$. Partial widths of these decays are computed by means of the three-point sum rule approach which is used to determine the strong couplings at relevant tetraquark-meson-meson vertices. Predictions obtained for the width $\Gamma _{\mathrm{T}}=55.5_{-9.9}^{+10.6}~\mathrm{MeV}$, as well as the mass of the tetraquark $T $ can be useful in investigations of fully heavy four-quark mesons.
|
hep-ph/9806388
|
Michael Sotiropoulos
|
R. Akhoury, M. G. Sotiropoulos (U. Michigan) and G. Sterman (SUNY
Stony Brook)
|
A novel factorization for $F_L$ in the large $x$ limit
|
Talk at DIS98, Brussels, Latex, 4 pages, uses sprocl.sty
| null | null |
UM-TH-98-06, ITP-SB-98-44
|
hep-ph
| null |
A novel factorization formula is presented for the longitudinal structure
function $F_L$ near the elastic region $x \to 1$ of deeply inelastic
scattering. In moment space this formula can resum all contributions to $F_L$
that are of order $\ln^k N/N$. This is achieved by defining a new jet function
which probes the transverse momentum of the struck parton in the target at
leading twist. The anomalous dimension $\gamma_{J^\prime}$ of this new jet
operator generates in moment space the logarithmic enhancements coming from the
fragmentation of the current jet in the final state. It is also shown how the
suggested factorization for $F_L$ is related to the corresponding one for $F_2$
in the same kinematic region.
|
[
{
"created": "Tue, 16 Jun 1998 21:47:19 GMT",
"version": "v1"
}
] |
2007-05-23
|
[
[
"Akhoury",
"R.",
"",
"U. Michigan"
],
[
"Sotiropoulos",
"M. G.",
"",
"U. Michigan"
],
[
"Sterman",
"G.",
"",
"SUNY\n Stony Brook"
]
] |
A novel factorization formula is presented for the longitudinal structure function $F_L$ near the elastic region $x \to 1$ of deeply inelastic scattering. In moment space this formula can resum all contributions to $F_L$ that are of order $\ln^k N/N$. This is achieved by defining a new jet function which probes the transverse momentum of the struck parton in the target at leading twist. The anomalous dimension $\gamma_{J^\prime}$ of this new jet operator generates in moment space the logarithmic enhancements coming from the fragmentation of the current jet in the final state. It is also shown how the suggested factorization for $F_L$ is related to the corresponding one for $F_2$ in the same kinematic region.
|
1510.04047
|
Masahiro Ibe
|
Cheng-Wei Chiang, Keisuke Harigaya, Masahiro Ibe, Tsutomu T. Yanagida
|
Revisiting R-invariant Direct Gauge Mediation
|
27 pages, 7 figures
| null |
10.1007/JHEP03(2016)145
|
IPMU15-0180
|
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We revisit a special model of gauge mediated supersymmetry breaking, the
"R-invariant direct gauge mediation." We pay particular attention to whether
the model is consistent with the minimal model of the \mu-term, i.e., a simple
mass term of the Higgs doublets in the superpotential. Although the
incompatibility is highlighted in view of the current experimental constraints
on the superparticle masses and the observed Higgs boson mass, the minimal
\mu-term can be consistent with the R-invariant gauge mediation model via a
careful choice of model parameters. We derive an upper limit on the gluino mass
from the observed Higgs boson mass. We also discuss whether the model can
explain the 3\sigma excess of the Z+jets+$E_T^{\rm miss}$ events reported by
the ATLAS Collaboration.
|
[
{
"created": "Wed, 14 Oct 2015 11:28:09 GMT",
"version": "v1"
}
] |
2016-04-20
|
[
[
"Chiang",
"Cheng-Wei",
""
],
[
"Harigaya",
"Keisuke",
""
],
[
"Ibe",
"Masahiro",
""
],
[
"Yanagida",
"Tsutomu T.",
""
]
] |
We revisit a special model of gauge mediated supersymmetry breaking, the "R-invariant direct gauge mediation." We pay particular attention to whether the model is consistent with the minimal model of the \mu-term, i.e., a simple mass term of the Higgs doublets in the superpotential. Although the incompatibility is highlighted in view of the current experimental constraints on the superparticle masses and the observed Higgs boson mass, the minimal \mu-term can be consistent with the R-invariant gauge mediation model via a careful choice of model parameters. We derive an upper limit on the gluino mass from the observed Higgs boson mass. We also discuss whether the model can explain the 3\sigma excess of the Z+jets+$E_T^{\rm miss}$ events reported by the ATLAS Collaboration.
|
1302.3331
|
C. Q. Geng
|
Y.K. Hsiao and C.Q. Geng
|
Identifying Glueball at 3.02 GeV in Baryonic $B$ Decays
|
11 pages, 2 figure, title changed, revised version accepted by PLB
|
Phys. Lett. B 727 (2013) 168-171
|
10.1016/j.physletb.2013.10.008
| null |
hep-ph hep-ex
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We examine the nature of the unknown enhancement around 3 GeV observed by the
BABAR collaboration in the $m_{p\bar p}$ spectrum of the $\bar B^0\to p\bar p
D^0$ decay. Suspecting that the peak is a resonance, which can be neither
identified as a charmonium state, such as $\eta_c$ or $J/\psi$, nor classified
as one of the light-flavor mesons, we conclude that it corresponds to a
glueball fitted as X(3020) with $(m_X,\;\Gamma_X)=(3020\pm 8,\; 107\pm
30)\;\text{MeV}$, which could be the first glueball state above 3 GeV. This
state also appears in the $m_{p\bar p}$ spectrum of the $\bar B^0\to p\bar p
D^{*0}$ decay.
|
[
{
"created": "Thu, 14 Feb 2013 08:00:35 GMT",
"version": "v1"
},
{
"created": "Wed, 9 Oct 2013 06:33:14 GMT",
"version": "v2"
}
] |
2013-11-15
|
[
[
"Hsiao",
"Y. K.",
""
],
[
"Geng",
"C. Q.",
""
]
] |
We examine the nature of the unknown enhancement around 3 GeV observed by the BABAR collaboration in the $m_{p\bar p}$ spectrum of the $\bar B^0\to p\bar p D^0$ decay. Suspecting that the peak is a resonance, which can be neither identified as a charmonium state, such as $\eta_c$ or $J/\psi$, nor classified as one of the light-flavor mesons, we conclude that it corresponds to a glueball fitted as X(3020) with $(m_X,\;\Gamma_X)=(3020\pm 8,\; 107\pm 30)\;\text{MeV}$, which could be the first glueball state above 3 GeV. This state also appears in the $m_{p\bar p}$ spectrum of the $\bar B^0\to p\bar p D^{*0}$ decay.
|
hep-ph/9604229
|
Michael Pluemacher
|
Michael Pluemacher
|
Baryogenesis and lepton number violation
|
latex2e, 22 pages, 9 figures, uses epsfig, pstricks and pst-coil
|
Z.Phys. C74 (1997) 549-559
| null |
DESY 96-052
|
hep-ph astro-ph
| null |
The cosmological baryon asymmetry can be explained by the nonperturbative
electroweak reprocessing of a lepton asymmetry generated in the
out-of-equilibrium decay of heavy right-handed Majorana neutrinos. We analyze
this mechanism in detail in the framework of a SO(10)-subgroup. We take three
right-handed neutrinos into account and discuss physical neutrino mass
matrices.
|
[
{
"created": "Wed, 3 Apr 1996 13:40:06 GMT",
"version": "v1"
}
] |
2007-05-23
|
[
[
"Pluemacher",
"Michael",
""
]
] |
The cosmological baryon asymmetry can be explained by the nonperturbative electroweak reprocessing of a lepton asymmetry generated in the out-of-equilibrium decay of heavy right-handed Majorana neutrinos. We analyze this mechanism in detail in the framework of a SO(10)-subgroup. We take three right-handed neutrinos into account and discuss physical neutrino mass matrices.
|
hep-ph/0406242
|
Eef van Beveren
|
Eef van Beveren and George Rupp
|
Classification of the scalar mesons: a strange pole expedition into
charm and beauty territory
|
review article, 19 pages, plain LaTeX, figures included
|
Mod.Phys.Lett.A19:1949-1967,2004
|
10.1142/S0217732304015208
| null |
hep-ph
| null |
The classification of scalar and vector mesons is reviewed within the
framework of the Resonance-Spectrum Expansion (RSE). This method allows a
simple and straightforward description of non-exotic meson-meson scattering,
incorporating the effects of quark confinement and OZI-allowed decay in a fully
nonperturbative way. Results for resonances and bound states are compared to
experiment, on the basis of computed pole positions and cross sections. New
predictions for open-charm and -bottom scalar mesons are presented.
Concretely, observed vector states for u-ubar/d-dbar, s-sbar, c-cbar, and
b-bbar are reproduced, and others are predicted. In the light scalar sector,
the now established two nonets, one below 1 GeV and one in the region 1.3 - 1.5
GeV, are easily described, through the appearance of extra poles in the
scattering matrix. The recently found Ds0*(2317) meson is accurately reproduced
by the same mechanism, as a quasi-bound state in the coupled c-sbar/DK system.
In S-wave D-pion and B-pion scattering, new resonances are foreseen close to
threshold, i.e., a D0* at 2.16(+-0.05) GeV some 250 MeV wide, and a B0* at
5.47(+-0.05) GeV with a width of about 50 MeV. Additional predictions concern
the existence of b-sbar and b-cbar scalar mesons, stable with respect to
OZI-allowed decay to BK and BD, respectively, namely at 5.61(+-0.05) GeV resp.
6.64(+-0.05) GeV.
|
[
{
"created": "Tue, 22 Jun 2004 15:18:08 GMT",
"version": "v1"
},
{
"created": "Mon, 28 Jun 2004 13:28:53 GMT",
"version": "v2"
}
] |
2008-11-26
|
[
[
"van Beveren",
"Eef",
""
],
[
"Rupp",
"George",
""
]
] |
The classification of scalar and vector mesons is reviewed within the framework of the Resonance-Spectrum Expansion (RSE). This method allows a simple and straightforward description of non-exotic meson-meson scattering, incorporating the effects of quark confinement and OZI-allowed decay in a fully nonperturbative way. Results for resonances and bound states are compared to experiment, on the basis of computed pole positions and cross sections. New predictions for open-charm and -bottom scalar mesons are presented. Concretely, observed vector states for u-ubar/d-dbar, s-sbar, c-cbar, and b-bbar are reproduced, and others are predicted. In the light scalar sector, the now established two nonets, one below 1 GeV and one in the region 1.3 - 1.5 GeV, are easily described, through the appearance of extra poles in the scattering matrix. The recently found Ds0*(2317) meson is accurately reproduced by the same mechanism, as a quasi-bound state in the coupled c-sbar/DK system. In S-wave D-pion and B-pion scattering, new resonances are foreseen close to threshold, i.e., a D0* at 2.16(+-0.05) GeV some 250 MeV wide, and a B0* at 5.47(+-0.05) GeV with a width of about 50 MeV. Additional predictions concern the existence of b-sbar and b-cbar scalar mesons, stable with respect to OZI-allowed decay to BK and BD, respectively, namely at 5.61(+-0.05) GeV resp. 6.64(+-0.05) GeV.
|
1911.11383
|
Kanat Nurlan
|
M. K. Volkov, A. A. Pivovarov and K. Nurlan
|
The decay $\tau \to K^{*-}(892) \eta \nu_{\tau}$ in the NJL model
|
4 pages, 3 figures
| null |
10.1016/j.nuclphysa.2020.121810
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
The decay width $\tau \to K^{*-}(892) \eta \nu_{\tau}$ was calculated in the
Nambu--Jona-Lasinio model. Four channels were taken into account: the contact
channel (the final states are directly producted from lepton current without
any intermediate meson states), the axial-vector channel with two intermediate
physical states $K_{1}(1270)$ and $K_{1}(1400)$, the vector channel with
intermediate $K^{*}(892)$ meson and the pseudoscalar channel with intermediate
$K$ meson. It is shown that the first two channels give the dominant
contribution to the decay width. Of the remaining two channels, the
pseudoscalar channel plays a more prominent role. The final result is in
satisfactory agreement with experimental data. Prediction for the differential
decay width is presented.
|
[
{
"created": "Tue, 26 Nov 2019 07:50:26 GMT",
"version": "v1"
}
] |
2020-05-20
|
[
[
"Volkov",
"M. K.",
""
],
[
"Pivovarov",
"A. A.",
""
],
[
"Nurlan",
"K.",
""
]
] |
The decay width $\tau \to K^{*-}(892) \eta \nu_{\tau}$ was calculated in the Nambu--Jona-Lasinio model. Four channels were taken into account: the contact channel (the final states are directly producted from lepton current without any intermediate meson states), the axial-vector channel with two intermediate physical states $K_{1}(1270)$ and $K_{1}(1400)$, the vector channel with intermediate $K^{*}(892)$ meson and the pseudoscalar channel with intermediate $K$ meson. It is shown that the first two channels give the dominant contribution to the decay width. Of the remaining two channels, the pseudoscalar channel plays a more prominent role. The final result is in satisfactory agreement with experimental data. Prediction for the differential decay width is presented.
|
hep-ph/9408369
|
Karsten Jedamzik
|
K. Jedamzik and G.M. Fuller
|
Baryon Number Transport in a Cosmic QCD-Phase Transition
|
25 pages, 4 figures (available upon request by mail or fax), plain
tex, UCRL-JC-000000
| null | null | null |
hep-ph
| null |
We investigate the transport of baryon number across phase boundaries in a
putative first order QCD-phase transition. Two independent phenomenological
models are employed to estimate the baryon penetrability at the phase boundary:
chromoelectric flux tube models; and an analogy to baryon-baryon coalescence in
nuclear physics. Our analysis indicates that baryon transport across phase
boundaries may be order of magnitude more efficient than other work has
suggested. We discuss the substantial uncertainties involved in estimating
baryon penetrability at phase boundaries.
|
[
{
"created": "Thu, 25 Aug 1994 18:02:15 GMT",
"version": "v1"
}
] |
2009-09-25
|
[
[
"Jedamzik",
"K.",
""
],
[
"Fuller",
"G. M.",
""
]
] |
We investigate the transport of baryon number across phase boundaries in a putative first order QCD-phase transition. Two independent phenomenological models are employed to estimate the baryon penetrability at the phase boundary: chromoelectric flux tube models; and an analogy to baryon-baryon coalescence in nuclear physics. Our analysis indicates that baryon transport across phase boundaries may be order of magnitude more efficient than other work has suggested. We discuss the substantial uncertainties involved in estimating baryon penetrability at phase boundaries.
|
1409.0397
|
Baishali Saikia
|
Baishali Saikia and D.K. Choudhury
|
Singularity free analysis of a self-similar model of proton structure
function at small \textit{x}
|
11 pages, 5 figures, 4 tables
| null | null | null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
In this paper we make re-analysis of a self-similarity based model of the
proton structure function at small \textit{x} pursued in recent years. The
additional assumption is that it should be singularity free in the entire
kinematic range $0<\textit{x}<1$. Our analysis indicates that the model is
valid in a more restrictive range of $Q^{2}$. We also discuss the possibility
of incorporation of Froissart saturation condition in the model.
|
[
{
"created": "Mon, 1 Sep 2014 12:58:34 GMT",
"version": "v1"
}
] |
2014-09-02
|
[
[
"Saikia",
"Baishali",
""
],
[
"Choudhury",
"D. K.",
""
]
] |
In this paper we make re-analysis of a self-similarity based model of the proton structure function at small \textit{x} pursued in recent years. The additional assumption is that it should be singularity free in the entire kinematic range $0<\textit{x}<1$. Our analysis indicates that the model is valid in a more restrictive range of $Q^{2}$. We also discuss the possibility of incorporation of Froissart saturation condition in the model.
|
2005.07894
|
Yuichi Uesaka
|
Yuichi Uesaka
|
Model identification in $\mu^-\to e^-$ conversion with invisible boson
emission using muonic atoms
|
9 pages, 7 figures
|
Phys. Rev. D 102, 095007 (2020)
|
10.1103/PhysRevD.102.095007
| null |
hep-ph hep-ex
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
In this article, we investigate the $\mu^-\to e^-X$ process in a muonic atom,
where $X$ is a light neutral boson. By calculating the spectrum of the emitted
electron for several cases, we discuss the model-discriminating power of the
process. We report the strong model dependence of the spectrum near a
high-energy endpoint. Our findings show that future experiments using muonic
atoms are helpful to identify the properties of exotic bosons.
|
[
{
"created": "Sat, 16 May 2020 07:48:05 GMT",
"version": "v1"
},
{
"created": "Fri, 6 Nov 2020 11:17:04 GMT",
"version": "v2"
}
] |
2020-11-18
|
[
[
"Uesaka",
"Yuichi",
""
]
] |
In this article, we investigate the $\mu^-\to e^-X$ process in a muonic atom, where $X$ is a light neutral boson. By calculating the spectrum of the emitted electron for several cases, we discuss the model-discriminating power of the process. We report the strong model dependence of the spectrum near a high-energy endpoint. Our findings show that future experiments using muonic atoms are helpful to identify the properties of exotic bosons.
|
hep-ph/9311268
| null |
Howard D. Trottier
|
An upper bound on $P$-wave charmonium production via the color-octet
mechanism
|
Presented at the Workshop on Physics at Current Accelerators and the
Supercollider, Argonne National Laboratory, June 1993. Pages: 8 (regular
LaTeX document). Includes three postscript figures
| null | null |
SFU HEP-113-93
|
hep-ph
| null |
A factorization theorem for $P$-wave quarkonium production, recently derived
by Bodwin, Braaten, Yuan and Lepage, is applied to $\Upsilon \to \chi_{cJ} +
X$, where $\chi_{cJ}$ labels the ${}^3 P_J$ charmonium states. The widths for
$\chi_{cJ}$ production through color-singlet $P$-wave and color-octet $S$-wave
$c \bar c$ subprocesses are computed each to leading order in $\alpha_s$.
Experimental data on $\Upsilon \to J / \psi + X$ is used to obtain an upper
bound on a nonperturbative parameter (related to the probability for
color-octet $S$-wave $c \bar c$ hadronization into $P$-wave charmonium) that
enters into the factorization theorem.
|
[
{
"created": "Thu, 11 Nov 1993 00:11:42 GMT",
"version": "v1"
}
] |
2009-09-25
|
[
[
"Trottier",
"Howard D.",
""
]
] |
A factorization theorem for $P$-wave quarkonium production, recently derived by Bodwin, Braaten, Yuan and Lepage, is applied to $\Upsilon \to \chi_{cJ} + X$, where $\chi_{cJ}$ labels the ${}^3 P_J$ charmonium states. The widths for $\chi_{cJ}$ production through color-singlet $P$-wave and color-octet $S$-wave $c \bar c$ subprocesses are computed each to leading order in $\alpha_s$. Experimental data on $\Upsilon \to J / \psi + X$ is used to obtain an upper bound on a nonperturbative parameter (related to the probability for color-octet $S$-wave $c \bar c$ hadronization into $P$-wave charmonium) that enters into the factorization theorem.
|
2112.02107
|
Lena Funcke
|
Gia Dvali, Lena Funcke, Tanmay Vachaspati
|
Time- and Space-Varying Neutrino Mass Matrix from Soft Topological
Defects
|
10 pages, v2: updated to match journal version
|
Phys. Rev. Lett. 130, 091601 (2023)
|
10.1103/PhysRevLett.130.091601
|
MIT-CTP/5355
|
hep-ph astro-ph.CO gr-qc hep-th
|
http://creativecommons.org/licenses/by/4.0/
|
We study the formation and evolution of topological defects that arise in the
post-recombination phase transition predicted by the gravitational neutrino
mass model in [Dvali, Funcke, Phys. Rev. D 93, 113002 (2016)]. In the
transition, global skyrmions, monopoles, strings, and domain walls form due to
the spontaneous breaking of the neutrino flavor symmetry. These defects are
unique in their softness and origin; as they appear at a very low energy scale,
they only require Standard Model particle content, and they differ
fundamentally depending on the Majorana or Dirac nature of the neutrinos. One
of the observational signatures is the time dependence and space dependence of
the neutrino mass matrix, which could be observable in future neutrino
experiments. Already existing data rule out parts of the parameter space in the
Majorana case. The detection of this effect could shed light onto the open
question of the Dirac versus Majorana neutrino nature.
|
[
{
"created": "Fri, 3 Dec 2021 19:00:01 GMT",
"version": "v1"
},
{
"created": "Wed, 9 Aug 2023 08:02:59 GMT",
"version": "v2"
}
] |
2023-08-10
|
[
[
"Dvali",
"Gia",
""
],
[
"Funcke",
"Lena",
""
],
[
"Vachaspati",
"Tanmay",
""
]
] |
We study the formation and evolution of topological defects that arise in the post-recombination phase transition predicted by the gravitational neutrino mass model in [Dvali, Funcke, Phys. Rev. D 93, 113002 (2016)]. In the transition, global skyrmions, monopoles, strings, and domain walls form due to the spontaneous breaking of the neutrino flavor symmetry. These defects are unique in their softness and origin; as they appear at a very low energy scale, they only require Standard Model particle content, and they differ fundamentally depending on the Majorana or Dirac nature of the neutrinos. One of the observational signatures is the time dependence and space dependence of the neutrino mass matrix, which could be observable in future neutrino experiments. Already existing data rule out parts of the parameter space in the Majorana case. The detection of this effect could shed light onto the open question of the Dirac versus Majorana neutrino nature.
|
1210.7176
|
Chuwen Xiao
|
C. W. Xiao, F. Aceti and M. Bayar
|
The small $K \pi$ component in the $K^*$ wave functions
| null | null |
10.1140/epja/i2013-13022-y
| null |
hep-ph nucl-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We use a recently developed formalism which generalizes the Weinberg's
compositeness condition to partial waves higher than s-wave in order to
determine the probability of having a $K \pi$ component in the $K^*$ wave
function. A fit is made to the $K \pi$ phase shifts in p-wave, from where the
coupling of $K^*$ to $K \pi$ and the $K \pi$ loop function are determined.
These ingredients allow us to determine that the $K^*$ is a genuine state,
different to a $K \pi$ component, in a proportion of about 80%.
|
[
{
"created": "Fri, 26 Oct 2012 16:16:23 GMT",
"version": "v1"
}
] |
2015-06-11
|
[
[
"Xiao",
"C. W.",
""
],
[
"Aceti",
"F.",
""
],
[
"Bayar",
"M.",
""
]
] |
We use a recently developed formalism which generalizes the Weinberg's compositeness condition to partial waves higher than s-wave in order to determine the probability of having a $K \pi$ component in the $K^*$ wave function. A fit is made to the $K \pi$ phase shifts in p-wave, from where the coupling of $K^*$ to $K \pi$ and the $K \pi$ loop function are determined. These ingredients allow us to determine that the $K^*$ is a genuine state, different to a $K \pi$ component, in a proportion of about 80%.
|
hep-ph/0505150
|
Feliciano de Soto
|
Ph. Boucaud (Orsay, LPT), F. De Soto (Huelva U. and LPSC, Grenoble),
A. Le Yaouanc, J.P. Leroy, J. Micheli, O. Pene (Orsay, LPT), J.
Rodriguez-Quintero (Huelva U.)
|
Instanton traces in lattice gluon correlation functions
|
4 pages, talk given at XXXX Rencontres de Moriond on QCD and Hadronic
Interactions, La Thuile (Italy)
| null | null | null |
hep-ph
| null |
Strong coupling constant computed in Landau gauge and MOM renormalization
scheme from lattice two and three gluon Green Functions exhibits an unexpected
behavior in the deep IR, showing a maximum value around $1 {\rm GeV}$. We
analise this coupling below this maximum within a semiclassical approach, were
gluon degrees of freedom at very low energies are described in terms of the
classical solutions of the lagrangian, namely instantons. We provide some new
results concerning the relationship between instantons and the low energy
dynamics of QCD, by analising gluon two- and three-point Green functions
separately and with the help of a cooling procedure to eliminate short range
correlations.
|
[
{
"created": "Tue, 17 May 2005 15:03:01 GMT",
"version": "v1"
}
] |
2007-05-23
|
[
[
"Boucaud",
"Ph.",
"",
"Orsay, LPT"
],
[
"De Soto",
"F.",
"",
"Huelva U. and LPSC, Grenoble"
],
[
"Yaouanc",
"A. Le",
"",
"Orsay, LPT"
],
[
"Leroy",
"J. P.",
"",
"Orsay, LPT"
],
[
"Micheli",
"J.",
"",
"Orsay, LPT"
],
[
"Pene",
"O.",
"",
"Orsay, LPT"
],
[
"Rodriguez-Quintero",
"J.",
"",
"Huelva U."
]
] |
Strong coupling constant computed in Landau gauge and MOM renormalization scheme from lattice two and three gluon Green Functions exhibits an unexpected behavior in the deep IR, showing a maximum value around $1 {\rm GeV}$. We analise this coupling below this maximum within a semiclassical approach, were gluon degrees of freedom at very low energies are described in terms of the classical solutions of the lagrangian, namely instantons. We provide some new results concerning the relationship between instantons and the low energy dynamics of QCD, by analising gluon two- and three-point Green functions separately and with the help of a cooling procedure to eliminate short range correlations.
|
hep-ph/0512118
|
Takeo Moroi
|
Takehiko Asaka, Koji Ishiwata and Takeo Moroi
|
Right-Handed Sneutrino as Cold Dark Matter
|
4 pages, 1 figure
|
Phys.Rev. D73 (2006) 051301
|
10.1103/PhysRevD.73.051301
|
TU-760
|
hep-ph astro-ph
| null |
We consider supersymmetric models with right-handed neutrinos where neutrino
masses are purely Dirac-type. In this model, right-handed sneutrino can be the
lightest supersymmetric particle and can be a viable candidate of cold dark
matter of the universe. Right-handed sneutrinos are never thermalized in the
early universe because of weakness of Yukawa interaction, but are effectively
produced by decays of various superparticles. We show that the present mass
density of right-handed sneutrino can be consistent with the observed dark
matter density.
|
[
{
"created": "Fri, 9 Dec 2005 09:54:49 GMT",
"version": "v1"
}
] |
2009-11-11
|
[
[
"Asaka",
"Takehiko",
""
],
[
"Ishiwata",
"Koji",
""
],
[
"Moroi",
"Takeo",
""
]
] |
We consider supersymmetric models with right-handed neutrinos where neutrino masses are purely Dirac-type. In this model, right-handed sneutrino can be the lightest supersymmetric particle and can be a viable candidate of cold dark matter of the universe. Right-handed sneutrinos are never thermalized in the early universe because of weakness of Yukawa interaction, but are effectively produced by decays of various superparticles. We show that the present mass density of right-handed sneutrino can be consistent with the observed dark matter density.
|
hep-ph/9903393
|
John Terning
|
Markus A. Luty, John Terning
|
Single Sector Supersymmetry Breaking
|
7 pages, RevTeX, Talk presented by J. Terning at DPF '99, Los Angeles
| null | null |
UCB-PTH-99/09, LBNL-42988
|
hep-ph
| null |
We review recent work on realistic models that break supersymmetry
dynamically and give rise to composite quarks and leptons, all in a single
sector. These models have a completely natural suppression of flavor-changing
neutral currents, and the hierarchy of Yukawa couplings is explained by the
dimensionality of composite states. The generic signatures are unification of
scalar masses with different quantum numbers at the compositeness scale, and
lighter gaugino, Higgsino, and third-generation sfermion masses.
|
[
{
"created": "Thu, 18 Mar 1999 01:41:11 GMT",
"version": "v1"
}
] |
2007-05-23
|
[
[
"Luty",
"Markus A.",
""
],
[
"Terning",
"John",
""
]
] |
We review recent work on realistic models that break supersymmetry dynamically and give rise to composite quarks and leptons, all in a single sector. These models have a completely natural suppression of flavor-changing neutral currents, and the hierarchy of Yukawa couplings is explained by the dimensionality of composite states. The generic signatures are unification of scalar masses with different quantum numbers at the compositeness scale, and lighter gaugino, Higgsino, and third-generation sfermion masses.
|
1606.09526
|
Antoni Szczurek
|
Antoni Szczurek, Rafal Maciula, Vladimir A. Saleev and Alexandra V.
Shipilova
|
New single- and double-parton scattering mechanisms for double charmed
meson production
|
6 pages, 4 figures, a talk given by A.Szczurek at the DIS2016
workshop, Hamburg, April 2016
| null | null | null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We discuss charm meson-meson pair production recently observed by the LHCb
Collaboration at $\sqrt{s}$ = 7 TeV in proton-proton scattering. We examine
double-parton scattering (DPS) mechanisms of double $c \bar c$ production and
following $cc \to D^{0}D^{0}$ hadronization as well as double $g$ and mixed $g
c\bar c $ production with $gg \to D^{0}D^{0}$ and $gc \to D^{0}D^{0}$
hadronization calculated with the help of the scale-dependent KKKS08
fragmentation functions. A new single-parton scattering (SPS) mechanism of $gg$
production is also taken into consideration. Calculated differential
distributions as a function of transverse momentum $p_{T}$ of one of the
$D^{0}$ mesons, pair invariant mass $M_{D^{0}D^{0}}$ and azimuthal angle
$\varphi_{D^{0}D^{0}}$ distributions are confronted with the measured ones. The
manifestation of the new SPS mechanisms with $g \to D^{0}$ fragmentation within
the scale-dependent fragmentation scheme change the overall picture suitable
for standard scale-independent fragmentation where only DPS $cc \to D^{0}D^{0}$
mechanism is present. Some consequences of the new mechanisms are discussed
|
[
{
"created": "Thu, 30 Jun 2016 14:57:48 GMT",
"version": "v1"
}
] |
2016-07-01
|
[
[
"Szczurek",
"Antoni",
""
],
[
"Maciula",
"Rafal",
""
],
[
"Saleev",
"Vladimir A.",
""
],
[
"Shipilova",
"Alexandra V.",
""
]
] |
We discuss charm meson-meson pair production recently observed by the LHCb Collaboration at $\sqrt{s}$ = 7 TeV in proton-proton scattering. We examine double-parton scattering (DPS) mechanisms of double $c \bar c$ production and following $cc \to D^{0}D^{0}$ hadronization as well as double $g$ and mixed $g c\bar c $ production with $gg \to D^{0}D^{0}$ and $gc \to D^{0}D^{0}$ hadronization calculated with the help of the scale-dependent KKKS08 fragmentation functions. A new single-parton scattering (SPS) mechanism of $gg$ production is also taken into consideration. Calculated differential distributions as a function of transverse momentum $p_{T}$ of one of the $D^{0}$ mesons, pair invariant mass $M_{D^{0}D^{0}}$ and azimuthal angle $\varphi_{D^{0}D^{0}}$ distributions are confronted with the measured ones. The manifestation of the new SPS mechanisms with $g \to D^{0}$ fragmentation within the scale-dependent fragmentation scheme change the overall picture suitable for standard scale-independent fragmentation where only DPS $cc \to D^{0}D^{0}$ mechanism is present. Some consequences of the new mechanisms are discussed
|
hep-ph/9710486
|
Alexander Ilyichev
|
I. V. Akushevich, A. N. Ilyichev and N. M. Shumeiko
|
Electroweak Radiative Effects in Deep Inelastic Interaction of Polarized
Leptons and Nucleons
|
11 pages, 1 figure
|
Proceedings of the XVIII Workshop on High Energy Physics and Field
Theory. Protvino, Russia, June 26-30,1995. Protvino, 1996, p. 195-204
| null | null |
hep-ph
| null |
The results for one-loop correction to deep inelastic scattering of
longitudinal polarized leptons on longitudinal polarized hadrons are obtained
withing the framework of the standard theory of electroweak interactions and
ordinary quark-parton model. The on-shell renormalization scheme in
t'Hooft-Feynman gauge is applied.
The numerical analysis is carried out under conditions of modern particle
physics experiments.Particular emphasis is laid on contributions usually
ignored at RC procedure --- electroweak corrections to electromagnetic
asymmetry and RC to hadronic current. The structure of RC contribution to
polarized asymmetries within the framework of QED and electroweak theory is
also discused
|
[
{
"created": "Mon, 27 Oct 1997 17:29:15 GMT",
"version": "v1"
},
{
"created": "Thu, 30 Oct 1997 11:28:57 GMT",
"version": "v2"
}
] |
2007-05-23
|
[
[
"Akushevich",
"I. V.",
""
],
[
"Ilyichev",
"A. N.",
""
],
[
"Shumeiko",
"N. M.",
""
]
] |
The results for one-loop correction to deep inelastic scattering of longitudinal polarized leptons on longitudinal polarized hadrons are obtained withing the framework of the standard theory of electroweak interactions and ordinary quark-parton model. The on-shell renormalization scheme in t'Hooft-Feynman gauge is applied. The numerical analysis is carried out under conditions of modern particle physics experiments.Particular emphasis is laid on contributions usually ignored at RC procedure --- electroweak corrections to electromagnetic asymmetry and RC to hadronic current. The structure of RC contribution to polarized asymmetries within the framework of QED and electroweak theory is also discused
|
1603.00865
|
Siavash Neshatpour
|
T. Hurth, F. Mahmoudi, S. Neshatpour
|
On the anomalies in the latest LHCb data
|
41 pages, 24 figures. v2: references and comment on 1006.4945
[hep-ph] added
| null |
10.1016/j.nuclphysb.2016.05.022
|
CERN-TH-2016-046, IPM/P.A-421, MITP/16-003
|
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Depending on the assumptions on the power corrections to the exclusive b -> s
l+ l- decays, the latest data of the LHCb collaboration - based on the 3 fb^-1
data set and on two different experimental analysis methods - still shows some
tensions with the SM predictions. We present a detailed analysis of the
theoretical inputs and various global fits to all the available b -> s l+ l-
data. This constitutes the first global analysis of the new data of the LHCb
collaboration based on the hypothesis that these tensions can be at least
partially explained by new physics contributions. In our model-independent
analysis we present one-, two-, four-, and also five-dimensional global fits in
the space of Wilson coefficients to all available b -> s l+ l- data. We also
compare the two different experimental LHCb analyses of the angular observables
in B -> K* mu+ mu-. We explicitly analyse the dependence of our results on the
assumptions about power corrections, but also on the errors present in the form
factor calculations. Moreover, based on our new global fits we present
predictions for ratios of observables which may show a sign of lepton
non-universality. Their measurements would crosscheck the LHCb result on the
ratio R_K = BR(B+ -> K+ mu+ mu-) / BR(B+ -> K+ e+ e-) in the low-q^2 region
which deviates from the SM prediction by 2.6 sigma.
|
[
{
"created": "Wed, 2 Mar 2016 20:56:40 GMT",
"version": "v1"
},
{
"created": "Wed, 23 Mar 2016 17:56:58 GMT",
"version": "v2"
}
] |
2016-06-29
|
[
[
"Hurth",
"T.",
""
],
[
"Mahmoudi",
"F.",
""
],
[
"Neshatpour",
"S.",
""
]
] |
Depending on the assumptions on the power corrections to the exclusive b -> s l+ l- decays, the latest data of the LHCb collaboration - based on the 3 fb^-1 data set and on two different experimental analysis methods - still shows some tensions with the SM predictions. We present a detailed analysis of the theoretical inputs and various global fits to all the available b -> s l+ l- data. This constitutes the first global analysis of the new data of the LHCb collaboration based on the hypothesis that these tensions can be at least partially explained by new physics contributions. In our model-independent analysis we present one-, two-, four-, and also five-dimensional global fits in the space of Wilson coefficients to all available b -> s l+ l- data. We also compare the two different experimental LHCb analyses of the angular observables in B -> K* mu+ mu-. We explicitly analyse the dependence of our results on the assumptions about power corrections, but also on the errors present in the form factor calculations. Moreover, based on our new global fits we present predictions for ratios of observables which may show a sign of lepton non-universality. Their measurements would crosscheck the LHCb result on the ratio R_K = BR(B+ -> K+ mu+ mu-) / BR(B+ -> K+ e+ e-) in the low-q^2 region which deviates from the SM prediction by 2.6 sigma.
|
0907.1052
|
Wayne W. Repko
|
Arsham Farzinnia, Duane A. Dicus, Wayne W. Repko and Todd M. Tinsley
|
Muon decay in a linearly polarized laser field
|
6 pages, no figures
|
Phys.Rev.D80:073004,2009
|
10.1103/PhysRevD.80.073004
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
In a previous paper, we showed that the decay rate of a muon is only slightly
affected by the presence of a circularly polarized laser and we gave an
analytic expression for the correction. In this paper, we present the
analytical result for the case of a linearly polarized laser. Again the effect
of the laser is small.
|
[
{
"created": "Mon, 6 Jul 2009 17:25:25 GMT",
"version": "v1"
}
] |
2009-10-29
|
[
[
"Farzinnia",
"Arsham",
""
],
[
"Dicus",
"Duane A.",
""
],
[
"Repko",
"Wayne W.",
""
],
[
"Tinsley",
"Todd M.",
""
]
] |
In a previous paper, we showed that the decay rate of a muon is only slightly affected by the presence of a circularly polarized laser and we gave an analytic expression for the correction. In this paper, we present the analytical result for the case of a linearly polarized laser. Again the effect of the laser is small.
|
2001.08708
|
Dimiter Hadjimichef
|
J. N. de Quadros, D. T. da Silva, M. L. L. da Silva, D. Hadjimichef
|
Strong decays of strange quarkonia in a corrected 3P0 model
|
To appear in Phys. Rev. C
| null |
10.1103/PhysRevC.101.025203
| null |
hep-ph nucl-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Extensively applied to both light and heavy meson decay and standing as one
of the most successful strong decay models is the $^{3}P_{0}$ model, in which
$q\bar{q}$ pair production is the dominant mechanism. In this paper we evaluate
strong decay amplitudes and partial widths of strange $S$ and $D$ state mesons,
namely $ \phi(1020)$, $\phi (1680) $, $ \phi (2050) $, $\phi_1 (1850) $,
$\phi_2 (1850) $ and $ \phi_3 (1850) $, in the bound-state corrected
$^{3}P_{0}$ decay model (C$^{3}P_{0}$). The C$^{3}P_{0}$ model is obtained in
the context of the Fock-Tani formalism, which is a mapping technique.
|
[
{
"created": "Thu, 23 Jan 2020 17:57:02 GMT",
"version": "v1"
}
] |
2020-02-26
|
[
[
"de Quadros",
"J. N.",
""
],
[
"da Silva",
"D. T.",
""
],
[
"da Silva",
"M. L. L.",
""
],
[
"Hadjimichef",
"D.",
""
]
] |
Extensively applied to both light and heavy meson decay and standing as one of the most successful strong decay models is the $^{3}P_{0}$ model, in which $q\bar{q}$ pair production is the dominant mechanism. In this paper we evaluate strong decay amplitudes and partial widths of strange $S$ and $D$ state mesons, namely $ \phi(1020)$, $\phi (1680) $, $ \phi (2050) $, $\phi_1 (1850) $, $\phi_2 (1850) $ and $ \phi_3 (1850) $, in the bound-state corrected $^{3}P_{0}$ decay model (C$^{3}P_{0}$). The C$^{3}P_{0}$ model is obtained in the context of the Fock-Tani formalism, which is a mapping technique.
|
hep-ph/0101091
| null |
H. P\"as and T.J. Weiler (Vanderbilt)
|
Absolute Neutrino Mass Determination
|
24 pages, RevTeX, 4 figures included, slight modification of abstract
|
Phys.Rev. D63 (2001) 113015
|
10.1103/PhysRevD.63.113015
|
VAND-TH-01-1
|
hep-ph astro-ph
| null |
We discuss four approaches to the determination of absolute neutrino mass.
These are the measurement of the zero-neutrino double beta decay rate, of the
tritium decay end-point spectrum, of the cosmic ray spectrum above the GZK
cutoff (in the Z-burst model), and the cosmological measurement of the power
spectrum governing the CMB and large scale structure. The first two approaches
are sensitive to the mass eigenstates coupling to the electron neutrino,
whereas the latter two are sensitive to the heavy component of the cosmic
neutrino background. All mass eigenstates are related by the $\Delta m^2$'s
inferred from neutrino oscillation data. Consequently, the potential for
absolute mass determination of each of the four approaches is correlated with
the other three, in ways that we point out.
|
[
{
"created": "Wed, 10 Jan 2001 18:01:26 GMT",
"version": "v1"
},
{
"created": "Fri, 12 Jan 2001 01:35:45 GMT",
"version": "v2"
}
] |
2009-11-07
|
[
[
"Päs",
"H.",
"",
"Vanderbilt"
],
[
"Weiler",
"T. J.",
"",
"Vanderbilt"
]
] |
We discuss four approaches to the determination of absolute neutrino mass. These are the measurement of the zero-neutrino double beta decay rate, of the tritium decay end-point spectrum, of the cosmic ray spectrum above the GZK cutoff (in the Z-burst model), and the cosmological measurement of the power spectrum governing the CMB and large scale structure. The first two approaches are sensitive to the mass eigenstates coupling to the electron neutrino, whereas the latter two are sensitive to the heavy component of the cosmic neutrino background. All mass eigenstates are related by the $\Delta m^2$'s inferred from neutrino oscillation data. Consequently, the potential for absolute mass determination of each of the four approaches is correlated with the other three, in ways that we point out.
|
hep-ph/0211261
|
Kiselev
|
V.V. Kiselev
|
Renormalization group improvement of truncated perturbative series in
QCD. Decays of tau-lepton and eta_c-charmonium
|
10 pages, LaTeX file, 2 eps-figyres, referense added
| null | null | null |
hep-ph
| null |
We formulate a general scheme to improve the truncated perturbative expansion
in alpha_s by means of the renormalization group in QCD for the single-scale
quantities. The procedure is used for the evaluation of hadronic decay rates of
tau-lepton and eta_c-charmonium. The scale dependence of result for eta_c is
studied in the scheme of fixed value for the MS-bar mass of charmed quark.
|
[
{
"created": "Sat, 16 Nov 2002 19:07:38 GMT",
"version": "v1"
},
{
"created": "Wed, 20 Nov 2002 08:54:50 GMT",
"version": "v2"
}
] |
2007-05-23
|
[
[
"Kiselev",
"V. V.",
""
]
] |
We formulate a general scheme to improve the truncated perturbative expansion in alpha_s by means of the renormalization group in QCD for the single-scale quantities. The procedure is used for the evaluation of hadronic decay rates of tau-lepton and eta_c-charmonium. The scale dependence of result for eta_c is studied in the scheme of fixed value for the MS-bar mass of charmed quark.
|
0812.3377
|
Steffen Stern
|
Steffen Stern
|
Dynamical dark energy and variation of fundamental "constants"
|
PhD thesis (University of Heidelberg, November 2008), 131 pages
| null | null | null |
hep-ph astro-ph gr-qc nucl-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
In this thesis we study the influence of a possible variation of fundamental
"constants" on the process of Big Bang Nucleosynthesis (BBN). Our findings are
combined with further studies on variations of constants in other physical
processes to constrain models of grand unification (GUT) and quintessence. We
will find that the 7Li problem of BBN can be ameliorated if one allows for
varying constants, where especially varying light quark masses show a strong
influence. Furthermore, we show that recent studies of varying constants are in
contradiction with each other and BBN in the framework of six exemplary GUT
scenarios, if one assumes monotonic variation with time. We conclude that there
is strong tension between recent claims of varying constants, hence either some
claims have to be revised, or there are much more sophisticated GUT relations
(and/or non-monotonic variations) realized in nature. The methods introduced in
this thesis prove to be powerful tools to probe regimes well beyond the
Standard Model of particle physics or the concordance model of cosmology, which
are currently inaccessible by experiments. Once the first irrefutable proofs of
varying constants are available, our method will allow for probing the
consistency of models beyond the standard theories like GUT or quintessence and
also the compatibility between these models.
|
[
{
"created": "Wed, 17 Dec 2008 19:38:57 GMT",
"version": "v1"
}
] |
2008-12-18
|
[
[
"Stern",
"Steffen",
""
]
] |
In this thesis we study the influence of a possible variation of fundamental "constants" on the process of Big Bang Nucleosynthesis (BBN). Our findings are combined with further studies on variations of constants in other physical processes to constrain models of grand unification (GUT) and quintessence. We will find that the 7Li problem of BBN can be ameliorated if one allows for varying constants, where especially varying light quark masses show a strong influence. Furthermore, we show that recent studies of varying constants are in contradiction with each other and BBN in the framework of six exemplary GUT scenarios, if one assumes monotonic variation with time. We conclude that there is strong tension between recent claims of varying constants, hence either some claims have to be revised, or there are much more sophisticated GUT relations (and/or non-monotonic variations) realized in nature. The methods introduced in this thesis prove to be powerful tools to probe regimes well beyond the Standard Model of particle physics or the concordance model of cosmology, which are currently inaccessible by experiments. Once the first irrefutable proofs of varying constants are available, our method will allow for probing the consistency of models beyond the standard theories like GUT or quintessence and also the compatibility between these models.
|
hep-ph/9511395
| null |
Nobuhiro Maekawa and Joe Sato
|
Duality of a Supersymmetric Standard Model without R parity
|
7 pages + 2 uuencoded eps figures, LaTeX
|
Prog.Theor.Phys. 96 (1996) 979-984
|
10.1143/PTP.96.979
|
KUNS-1370
|
hep-ph
| null |
Recently one of the authors proposed a dual theory of a Supersymmetric
Standard Model (SSM), in which it is naturally understood that at least one
quark (the top quark) should be heavy, i.e., almost the same order as the weak
scale, and the supersymmetric Higgs mass parameter $\mu$ can naturally be
expected to be small. Unfortunately, the model cannot possess Yukawa couplings
of lepton sector. In this paper, we examine a dual theory of a Supersymmetric
Standard Model without R parity. In this scenario, we can introduce Yukawa
couplings of lepton sector. In order to induce the enough large Yukawa
couplings of leptons, we must introduce fairly large R parity breaking terms,
which may be observed in the near future.
|
[
{
"created": "Thu, 23 Nov 1995 02:08:07 GMT",
"version": "v1"
}
] |
2009-10-28
|
[
[
"Maekawa",
"Nobuhiro",
""
],
[
"Sato",
"Joe",
""
]
] |
Recently one of the authors proposed a dual theory of a Supersymmetric Standard Model (SSM), in which it is naturally understood that at least one quark (the top quark) should be heavy, i.e., almost the same order as the weak scale, and the supersymmetric Higgs mass parameter $\mu$ can naturally be expected to be small. Unfortunately, the model cannot possess Yukawa couplings of lepton sector. In this paper, we examine a dual theory of a Supersymmetric Standard Model without R parity. In this scenario, we can introduce Yukawa couplings of lepton sector. In order to induce the enough large Yukawa couplings of leptons, we must introduce fairly large R parity breaking terms, which may be observed in the near future.
|
1712.03946
|
Ben Page
|
Samuel Abreu, Fernando Febres Cordero, Harald Ita, Ben Page and Mao
Zeng
|
Planar Two-Loop Five-Gluon Amplitudes from Numerical Unitarity
|
Additional references and text improvements
|
Phys. Rev. D 97, 116014 (2018)
|
10.1103/PhysRevD.97.116014
|
FR-PHENO-2017-025, UCLA-17-TEP-108
|
hep-ph hep-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We present a calculation of the planar two-loop five-gluon amplitudes. The
amplitudes are obtained in a variant of the generalized unitarity approach
suitable for numerical computations, which we extend for use with finite field
arithmetics. Employing a new method for the generation of unitarity-compatible
integration-by-parts identities, all helicity amplitudes are reduced to a
linear combination of master integrals for the first time. The approach allows
us to compute exact values for the integral coefficients at rational
phase-space points. All required master integrals are known analytically, and
we obtain arbitrary-precision values for the amplitudes.
|
[
{
"created": "Mon, 11 Dec 2017 18:53:29 GMT",
"version": "v1"
},
{
"created": "Mon, 18 Dec 2017 17:27:48 GMT",
"version": "v2"
}
] |
2018-06-27
|
[
[
"Abreu",
"Samuel",
""
],
[
"Cordero",
"Fernando Febres",
""
],
[
"Ita",
"Harald",
""
],
[
"Page",
"Ben",
""
],
[
"Zeng",
"Mao",
""
]
] |
We present a calculation of the planar two-loop five-gluon amplitudes. The amplitudes are obtained in a variant of the generalized unitarity approach suitable for numerical computations, which we extend for use with finite field arithmetics. Employing a new method for the generation of unitarity-compatible integration-by-parts identities, all helicity amplitudes are reduced to a linear combination of master integrals for the first time. The approach allows us to compute exact values for the integral coefficients at rational phase-space points. All required master integrals are known analytically, and we obtain arbitrary-precision values for the amplitudes.
|
hep-ph/0510333
|
Marcos Rodriguez Cardoso
|
M. C. Rodriguez
|
Scalar Sector in the Minimal Supersymmetric 3-3-1 model
|
It was included on the introduction of the article the motivation to
> study the model, and we moved the sections 4.1 and 4.2 to the appendix. It
has 22 pages, 9 figures. It was accepted to be published at International
Journal of Modern Physics A
|
Int.J.Mod.Phys. A21 (2006) 4303-4322
|
10.1142/S0217751X06031600
| null |
hep-ph
| null |
We consider the minimal supersymmetric extension of the 3-3-1 model and we
study the mass spectra in the scalar sector of this model without the
anti-sextet. We show that all our lighest scalars are in agreement with the
experimental limits.
|
[
{
"created": "Tue, 25 Oct 2005 17:46:25 GMT",
"version": "v1"
},
{
"created": "Tue, 24 Jan 2006 11:02:42 GMT",
"version": "v2"
},
{
"created": "Tue, 4 Jul 2006 21:51:10 GMT",
"version": "v3"
}
] |
2009-11-11
|
[
[
"Rodriguez",
"M. C.",
""
]
] |
We consider the minimal supersymmetric extension of the 3-3-1 model and we study the mass spectra in the scalar sector of this model without the anti-sextet. We show that all our lighest scalars are in agreement with the experimental limits.
|
hep-ph/0508281
|
Pedro Bicudo
|
Elsa Abreu, Pedro Bicudo
|
Glueball and hybrid mass and decay with string tension below Casimir
scaling
|
9pages RevTex, 5 figures, 4 tables, version with updated relativistic
kinetics
|
J.Phys. G34 (2007) 195207
| null | null |
hep-ph
| null |
Lattice computations with excited SU(3) representations suggest that the
confining gluon-gluon interaction complies with the Casimir scaling. The
constituent gluon models have also been assuming the Casimir scaling. Inspired
in type-II superconductors, we explore a new scenario for the gluon-gluon
interaction where the adjoint string is replaced by a pair of fundamental
strings, resulting in a factor of 2, smaller than 9/4. To test our proposal we
construct a simple constituent gluon model, extrapolated from the funnel
potential for quarkonium, and apply it to compute the wave-function of
glueballs and of hybrid gluelumps. From the decay widths of quarkonium, we also
extrapolate the decay widths of the glueballs and hybrid gluelumps. Our
predictions apply to charmonia, lightonia, glueballs and hybrid gluelumps with
large angular momentum.
|
[
{
"created": "Sun, 28 Aug 2005 10:39:28 GMT",
"version": "v1"
},
{
"created": "Sun, 19 Feb 2006 23:50:51 GMT",
"version": "v2"
}
] |
2007-05-23
|
[
[
"Abreu",
"Elsa",
""
],
[
"Bicudo",
"Pedro",
""
]
] |
Lattice computations with excited SU(3) representations suggest that the confining gluon-gluon interaction complies with the Casimir scaling. The constituent gluon models have also been assuming the Casimir scaling. Inspired in type-II superconductors, we explore a new scenario for the gluon-gluon interaction where the adjoint string is replaced by a pair of fundamental strings, resulting in a factor of 2, smaller than 9/4. To test our proposal we construct a simple constituent gluon model, extrapolated from the funnel potential for quarkonium, and apply it to compute the wave-function of glueballs and of hybrid gluelumps. From the decay widths of quarkonium, we also extrapolate the decay widths of the glueballs and hybrid gluelumps. Our predictions apply to charmonia, lightonia, glueballs and hybrid gluelumps with large angular momentum.
|
hep-ph/9707394
|
Saborges
|
J. S\'a Borges, J. Soares Barbosa and M. D. Tonasse
|
Two loops calculation in chiral perturbation theory and the
unitarization program of current algebra
|
13 pages, Revtex 3.0, no figures, submitted to Phys. Lett. B
|
Phys.Rev. D57 (1998) 4108-4113
|
10.1103/PhysRevD.57.4108
| null |
hep-ph
| null |
In this paper we compare two loop Chiral Perturbation Theory (ChPT)
calculation of pion-pion scattering with the unitarity second order correction
to the current algebra soft-pion theorem. It is shown that both methods lead to
the same analytic structure for the scattering amplitude.
|
[
{
"created": "Fri, 18 Jul 1997 20:41:51 GMT",
"version": "v1"
}
] |
2009-10-30
|
[
[
"Borges",
"J. Sá",
""
],
[
"Barbosa",
"J. Soares",
""
],
[
"Tonasse",
"M. D.",
""
]
] |
In this paper we compare two loop Chiral Perturbation Theory (ChPT) calculation of pion-pion scattering with the unitarity second order correction to the current algebra soft-pion theorem. It is shown that both methods lead to the same analytic structure for the scattering amplitude.
|
1606.09380
|
Gang l\"u
|
Gang L\"u, Sheng-Tao Li, Yu-Ting Wang
|
$CP$ violation for $B^+_{c}\rightarrow D_{(s)}^+\pi^+\pi^-$ in
Perturbative QCD
|
arXiv admin note: text overlap with arXiv:1112.1257, arXiv:0704.3132
by other authors
|
Phys. Rev. D 94, 034040 (2016)
|
10.1103/PhysRevD.94.034040
| null |
hep-ph
|
http://creativecommons.org/licenses/by/4.0/
|
In the perturbative QCD (PQCD) approach we study the direct $CP$ violation in
$B^+_{c}\rightarrow D_{(s)}^+\rho^0(\omega) \rightarrow D_{(s)}^+\pi^+\pi^-$
via the $\rho-\omega$ mixing mechanism. We find that the $CP$ violation can be
enhanced by $\rho-\omega$ mixing when the invariant masses of the $\pi^+\pi^-$
pairs are in the vicinity of the $\omega$ resonance. For the decay process
$B^+_{c}\rightarrow D^+\rho^0(\omega) \rightarrow D^+\pi^+\pi^-$, the maximum
$CP$ violation can reach 7.5 {\%}.
|
[
{
"created": "Thu, 30 Jun 2016 08:07:28 GMT",
"version": "v1"
}
] |
2016-08-31
|
[
[
"Lü",
"Gang",
""
],
[
"Li",
"Sheng-Tao",
""
],
[
"Wang",
"Yu-Ting",
""
]
] |
In the perturbative QCD (PQCD) approach we study the direct $CP$ violation in $B^+_{c}\rightarrow D_{(s)}^+\rho^0(\omega) \rightarrow D_{(s)}^+\pi^+\pi^-$ via the $\rho-\omega$ mixing mechanism. We find that the $CP$ violation can be enhanced by $\rho-\omega$ mixing when the invariant masses of the $\pi^+\pi^-$ pairs are in the vicinity of the $\omega$ resonance. For the decay process $B^+_{c}\rightarrow D^+\rho^0(\omega) \rightarrow D^+\pi^+\pi^-$, the maximum $CP$ violation can reach 7.5 {\%}.
|
1109.5961
|
Guang-You Qin
|
Guang-You Qin and Berndt M\"uller
|
Counting hot/cold spots in quark-gluon plasma
|
4 pages, 2 figures
|
Phys. Rev. C 85, 061901(R) (2012)
|
10.1103/PhysRevC.85.061901
| null |
hep-ph nucl-ex nucl-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We study how local fluctuations in the initial states of relativistic
heavy-ion collisions manifest themselves in the correlations between different
orders of harmonic moments of the density profiles, particularly those
involving only odd harmonics which purely arise from initial state
fluctuations. We find the strengths of those correlations are sensitive to the
number of hot and cold spots in the initial states. Hydrodynamic evolution of
the fireball translates initial state geometric anisotropies as well as their
correlations into final state momentum anisotropies and correlations. We
conclude that the measurement of the correlations between different harmonic
moments of final state azimuthal distribution can be employed to quantify the
inhomogeneity of the initial density profiles such as the population of hot and
cold spots that are produced in high energy nuclear collisions.
|
[
{
"created": "Tue, 27 Sep 2011 16:29:47 GMT",
"version": "v1"
},
{
"created": "Mon, 3 Oct 2011 14:41:00 GMT",
"version": "v2"
},
{
"created": "Sat, 23 Jun 2012 18:52:22 GMT",
"version": "v3"
}
] |
2015-05-30
|
[
[
"Qin",
"Guang-You",
""
],
[
"Müller",
"Berndt",
""
]
] |
We study how local fluctuations in the initial states of relativistic heavy-ion collisions manifest themselves in the correlations between different orders of harmonic moments of the density profiles, particularly those involving only odd harmonics which purely arise from initial state fluctuations. We find the strengths of those correlations are sensitive to the number of hot and cold spots in the initial states. Hydrodynamic evolution of the fireball translates initial state geometric anisotropies as well as their correlations into final state momentum anisotropies and correlations. We conclude that the measurement of the correlations between different harmonic moments of final state azimuthal distribution can be employed to quantify the inhomogeneity of the initial density profiles such as the population of hot and cold spots that are produced in high energy nuclear collisions.
|
2203.02760
|
Zhite Yu
|
Zhite Yu and C.-P. Yuan
|
Azimuthal angular correlation as a new boosted top jet substructure
|
contribution to Snowmass 2021; updated one figure legend
| null | null | null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
When a top quark is highly boosted, the $W$ boson from its decay has a
substantial linear polarization that results in a $\cos 2\phi$ azimuthal
angular correlation among the top decay products. We show that this correlation
can be measured for hadronically decayed boosted tops, and its magnitude
provides a way to measure the longitudinal polarization of top quark, which is
an important probe of new physics that couples to top sector.
|
[
{
"created": "Sat, 5 Mar 2022 14:30:42 GMT",
"version": "v1"
},
{
"created": "Wed, 30 Mar 2022 03:30:40 GMT",
"version": "v2"
}
] |
2023-09-18
|
[
[
"Yu",
"Zhite",
""
],
[
"Yuan",
"C. -P.",
""
]
] |
When a top quark is highly boosted, the $W$ boson from its decay has a substantial linear polarization that results in a $\cos 2\phi$ azimuthal angular correlation among the top decay products. We show that this correlation can be measured for hadronically decayed boosted tops, and its magnitude provides a way to measure the longitudinal polarization of top quark, which is an important probe of new physics that couples to top sector.
|
hep-ph/0611243
|
Petr Vogel
|
Petr Vogel
|
Neutrinoless double beta decay
|
Lecture notes at TASI2006, Boulder, CO, June 2006; to be published in
proceedings
| null |
10.1063/1.2402604
|
MAP-329
|
hep-ph
| null |
The status of the search for neutrinoless double beta decay is reviewed. The
effort to reach the sensitivity needed to cover the effective Majorana neutrino
mass corresponding to the degenerate and inverted mass hierarchy is described.
Various issues concerning the theory (and phenomenology) of the relation
between the $0\nu\beta\beta$ decay rate and the absolute neutrino mass scale
are discussed, in particular the issue of mechanism of the $0\nu\beta\beta$
decay. Finally, the relation between the neutrino magnetic moments and the
charge conjugation property (Dirac vs. Majorana) is described.
|
[
{
"created": "Fri, 17 Nov 2006 23:03:18 GMT",
"version": "v1"
}
] |
2009-11-11
|
[
[
"Vogel",
"Petr",
""
]
] |
The status of the search for neutrinoless double beta decay is reviewed. The effort to reach the sensitivity needed to cover the effective Majorana neutrino mass corresponding to the degenerate and inverted mass hierarchy is described. Various issues concerning the theory (and phenomenology) of the relation between the $0\nu\beta\beta$ decay rate and the absolute neutrino mass scale are discussed, in particular the issue of mechanism of the $0\nu\beta\beta$ decay. Finally, the relation between the neutrino magnetic moments and the charge conjugation property (Dirac vs. Majorana) is described.
|
hep-ph/0105319
|
Carlo Giunti
|
C. Giunti
|
Quantum Mechanics of Neutrino Oscillations
|
Talk presented at the XI International School "Particles and
Cosmology", April 2001, Baksan, Russia. Complete list of references available
at http://www.to.infn.it/~giunti/neutrino/qmno
| null | null |
DFTT 15/2001
|
hep-ph
| null |
Subtle problems in the theory of neutrino oscillations in vacuum are
discussed. It is shown that Lorentz invariance implies that in general flavor
neutrinos in oscillation experiments are superpositions of massive neutrinos
with different energies and different momenta. It is argued that a wave packet
description of massive neutrinos is necessary in order to understand the
physics of neutrino oscillations.
|
[
{
"created": "Wed, 30 May 2001 14:35:13 GMT",
"version": "v1"
}
] |
2007-05-23
|
[
[
"Giunti",
"C.",
""
]
] |
Subtle problems in the theory of neutrino oscillations in vacuum are discussed. It is shown that Lorentz invariance implies that in general flavor neutrinos in oscillation experiments are superpositions of massive neutrinos with different energies and different momenta. It is argued that a wave packet description of massive neutrinos is necessary in order to understand the physics of neutrino oscillations.
|
1907.04898
|
Benjamin Fuks
|
Stefano Frixione, Benjamin Fuks, Valentin Hirschi, Kentarou Mawatari,
Hua-Sheng Shao, Marthijn P. A. Sunder and Marco Zaro
|
Automated simulations beyond the Standard Model: supersymmetry
|
69 pages, 15 figures, ancillary material including cross section
tables (and material to reproduce our collider simulations)
|
JHEP 12 (2019) 008
|
10.1007/JHEP12(2019)008
|
OU-HET 1021, NIKHEF/2019-017
|
hep-ph hep-ex
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
The MadGraph5 aMC@NLO framework aims to automate all types of leading- and
next-to-leading-order-accurate simulations for any user-defined model that
stems from a renormalisable Lagrangian. In this paper, we present all of the
key ingredients of such models in the context of supersymmetric theories. In
order to do so, we extend the FeynRules package by giving it the possibility of
dealing with different renormalisation options that are relevant to
supersymmetric models. We also show how to deal with the problem posed by the
presence of narrow resonances, thus generalising the so-called on-shell
subtraction approaches. We extensively compare our total rate results with
those of both Prospino2 and Resummino, and present illustrative applications
relevant to the 13 TeV LHC, both at the total-rate and differential levels. The
computer programs that we have used to obtain the predictions presented here
are all publicly available.
|
[
{
"created": "Wed, 10 Jul 2019 19:41:42 GMT",
"version": "v1"
}
] |
2020-05-18
|
[
[
"Frixione",
"Stefano",
""
],
[
"Fuks",
"Benjamin",
""
],
[
"Hirschi",
"Valentin",
""
],
[
"Mawatari",
"Kentarou",
""
],
[
"Shao",
"Hua-Sheng",
""
],
[
"Sunder",
"Marthijn P. A.",
""
],
[
"Zaro",
"Marco",
""
]
] |
The MadGraph5 aMC@NLO framework aims to automate all types of leading- and next-to-leading-order-accurate simulations for any user-defined model that stems from a renormalisable Lagrangian. In this paper, we present all of the key ingredients of such models in the context of supersymmetric theories. In order to do so, we extend the FeynRules package by giving it the possibility of dealing with different renormalisation options that are relevant to supersymmetric models. We also show how to deal with the problem posed by the presence of narrow resonances, thus generalising the so-called on-shell subtraction approaches. We extensively compare our total rate results with those of both Prospino2 and Resummino, and present illustrative applications relevant to the 13 TeV LHC, both at the total-rate and differential levels. The computer programs that we have used to obtain the predictions presented here are all publicly available.
|
1810.01416
|
Johan L\"ofgren
|
Andreas Ekstedt and Johan L\"ofgren
|
On the relationship between gauge dependence and IR divergences in the
$\hbar$-expansion of the effective potential
|
15 pages
| null |
10.1007/JHEP01(2019)226
| null |
hep-ph hep-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Perturbative calculations of the effective potential evaluated at a broken
minimum, $ V_{\text{min}} $, are plagued by difficulties. It is hard to get a
finite and gauge invariant result for $ V_{\text{min}} $. In fact, the methods
proposed to deal with gauge dependence and IR divergences are orthogonal in
their approaches. Gauge dependence is dealt with through the $ \hbar
$-expansion, which establishes and maintains a strict loop-order separation of
terms. On the other hand, IR divergences seem to require a resummation that
mixes the different loop orders. In this paper we test these methods on Fermi
gauge Abelian Higgs at two loops. We find that the resummation procedure is not
capable of removing all divergences. Surprisingly, the $ \hbar $-expansion
seems to be able to deal with both the divergences and the gauge dependence. In
order to isolate the physical part of $ V_{\text{min}} $, we are guided by the
separation of scales that motivated the resummation procedure; the key result
is that only hard momentum modes contribute to $ V_{\text{min}} $.
|
[
{
"created": "Tue, 2 Oct 2018 18:00:00 GMT",
"version": "v1"
},
{
"created": "Wed, 3 Apr 2019 19:34:04 GMT",
"version": "v2"
}
] |
2019-04-05
|
[
[
"Ekstedt",
"Andreas",
""
],
[
"Löfgren",
"Johan",
""
]
] |
Perturbative calculations of the effective potential evaluated at a broken minimum, $ V_{\text{min}} $, are plagued by difficulties. It is hard to get a finite and gauge invariant result for $ V_{\text{min}} $. In fact, the methods proposed to deal with gauge dependence and IR divergences are orthogonal in their approaches. Gauge dependence is dealt with through the $ \hbar $-expansion, which establishes and maintains a strict loop-order separation of terms. On the other hand, IR divergences seem to require a resummation that mixes the different loop orders. In this paper we test these methods on Fermi gauge Abelian Higgs at two loops. We find that the resummation procedure is not capable of removing all divergences. Surprisingly, the $ \hbar $-expansion seems to be able to deal with both the divergences and the gauge dependence. In order to isolate the physical part of $ V_{\text{min}} $, we are guided by the separation of scales that motivated the resummation procedure; the key result is that only hard momentum modes contribute to $ V_{\text{min}} $.
|
hep-ph/0208052
|
Olivier Deligny
|
Olivier Deligny
|
Comment on "The Lamb Shift and Ultra High Energy Cosmic Rays" and
Comment on "Vacuum Polarization Energy Losses of High Energy Cosmic Rays"
|
4 pages, note on second paper corrected
| null | null | null |
hep-ph
| null |
The cosmic rays spectrum has been shown to extend well beyond 10^20 eV. With
nearly 20 events observed in the last 40 years, it is now established that
particles with energies near or above 10^21 eV. No nearby astrophysical object
has been shown to correlate with the arrival directions of the highest energy
events, yet the exponential cut-off in the high energy end of the spectrum one
expects to see in the case of far sources is not visible. It was recently
pointed out that the influence of the vacuum of quantum electrodynamics on
particle propagation could explain qualitatively this mystery. This note is a
critic to these ideas.
|
[
{
"created": "Tue, 6 Aug 2002 12:59:27 GMT",
"version": "v1"
},
{
"created": "Tue, 13 Aug 2002 12:04:14 GMT",
"version": "v2"
}
] |
2007-05-23
|
[
[
"Deligny",
"Olivier",
""
]
] |
The cosmic rays spectrum has been shown to extend well beyond 10^20 eV. With nearly 20 events observed in the last 40 years, it is now established that particles with energies near or above 10^21 eV. No nearby astrophysical object has been shown to correlate with the arrival directions of the highest energy events, yet the exponential cut-off in the high energy end of the spectrum one expects to see in the case of far sources is not visible. It was recently pointed out that the influence of the vacuum of quantum electrodynamics on particle propagation could explain qualitatively this mystery. This note is a critic to these ideas.
|
hep-ph/0609119
|
David Rainwater
|
W. Kilian, D. Rainwater and J. Reuter
|
Distinguishing Little-Higgs Product and Simple Group models at the LHC
and ILC
|
17p, submitted to PRD
|
Phys.Rev.D74:095003,2006; Erratum-ibid.D74:099905,2006
|
10.1103/PhysRevD.74.095003 10.1103/PhysRevD.74.099905
|
DESY 06-055
|
hep-ph
| null |
We propose a means to discriminate between the two basic variants of Little
Higgs models, the Product Group and Simple Group models, at the next generation
of colliders. It relies on a special coupling of light pseudoscalar particles
present in Little Higgs models, the pseudo-axions, to the Z and the Higgs
boson, which is present only in Simple Group models. We discuss the collider
phenomenology of the pseudo-axion in the presence of such a coupling at the
LHC, where resonant production and decay of either the Higgs or the
pseudo-axion induced by that coupling can be observed for much of parameter
space. The full allowed range of parameters, including regions where the
observability is limited at the LHC, is covered by a future ILC, where double
scalar production would be a golden channel to look for.
|
[
{
"created": "Tue, 12 Sep 2006 17:48:46 GMT",
"version": "v1"
}
] |
2014-11-18
|
[
[
"Kilian",
"W.",
""
],
[
"Rainwater",
"D.",
""
],
[
"Reuter",
"J.",
""
]
] |
We propose a means to discriminate between the two basic variants of Little Higgs models, the Product Group and Simple Group models, at the next generation of colliders. It relies on a special coupling of light pseudoscalar particles present in Little Higgs models, the pseudo-axions, to the Z and the Higgs boson, which is present only in Simple Group models. We discuss the collider phenomenology of the pseudo-axion in the presence of such a coupling at the LHC, where resonant production and decay of either the Higgs or the pseudo-axion induced by that coupling can be observed for much of parameter space. The full allowed range of parameters, including regions where the observability is limited at the LHC, is covered by a future ILC, where double scalar production would be a golden channel to look for.
|
hep-ph/0207198
|
Joao Pacheco B. C. de Melo
|
J. P. B. C. de Melo and Lauro Tomio (Instituto de Fisica Teorica,
Universidade Estadual Paulista, SP, Brazil), T. Frederico (Departamento de
Fisica, I TA, Centro Tecnico Aeroespacial, Brazil)
|
Light-front model of the kaon electromagnetic current
|
4 pages, 1 figure, uses World Scientific style file. To be published
by World Scientific in the proceedings of the "VIII International Workshop on
Hadron Physics,(HADRONS 2002)", Bento Goncalves, RS, Brazil
| null |
10.1142/9789812704429_0015
| null |
hep-ph
| null |
The electromagnetic form factor is extracted from both components of the
electromagnetic current: J(plus) and J(minus) with a pseudo-scalar coupling of
the quarks to the kaon.
In the case of J(plus) there is no pair term contribution in the Drell-Yan
frame. However, J(minus) component of the electromagnetic current the pair term
contribution is different from zero and is necessary include it to preserve the
rotational symmetry of the current.
|
[
{
"created": "Tue, 16 Jul 2002 18:17:41 GMT",
"version": "v1"
}
] |
2017-08-23
|
[
[
"de Melo",
"J. P. B. C.",
"",
"Instituto de Fisica Teorica,\n Universidade Estadual Paulista, SP, Brazil"
],
[
"Tomio",
"Lauro",
"",
"Instituto de Fisica Teorica,\n Universidade Estadual Paulista, SP, Brazil"
],
[
"Frederico",
"T.",
"",
"Departamento de\n Fisica, I TA, Centro Tecnico Aeroespacial, Brazil"
]
] |
The electromagnetic form factor is extracted from both components of the electromagnetic current: J(plus) and J(minus) with a pseudo-scalar coupling of the quarks to the kaon. In the case of J(plus) there is no pair term contribution in the Drell-Yan frame. However, J(minus) component of the electromagnetic current the pair term contribution is different from zero and is necessary include it to preserve the rotational symmetry of the current.
|
1805.06402
|
Luca Panizzi
|
Alexandra Carvalho, Stefano Moretti, Dermot O'Brien, Luca Panizzi and
Hugo Prager
|
Single production of vector-like quarks with large width at the Large
Hadron Collider
|
15 pages, 10 figures, 2 tables
|
Phys. Rev. D 98, 015029 (2018)
|
10.1103/PhysRevD.98.015029
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Vector-Like Quarks (VLQs) are predicted by several theoretical scenarios of
new physics and, having colour quantum numbers, can copiously be produced at
the Large Hadron Collider (LHC), so long that their mass is in the testable
kinematic regime of such a machine. While it would be convenient to assume that
such objects are narrow and can be treated in the so-called Narrow Width
Approximation (NWA), this is not always possible, owing to the fact that
couplings and particle content of such new physics scenarios are not generally
constrained, so that a large value of the former and/or a large variety of VLQ
decay channels into the latter can contribute to generate a large decay width
for such extra quarks. We have addressed here the issue of how best to tackle
in LHC analysis the presence of large (and model-dependent) interference
effects between different VLQ production and decay channels as well as between
these and the corresponding irreducible background. We have confined ourselves
to the case of single production of VLQs, which is rapidly becoming a channel
of choice in experimental searches owing to the ever increasing limits on their
mass, in turn depleting the yield of the historically well-established double
production channel. Indeed, this poses a further challenge, as the former is
model-dependent while the latter is essentially not. Despite these conditions,
we show here that an efficient approach is possible, which retains to a large
extent a degree of model independence in phenomenological studies of such VLQ
dynamics at the LHC.
|
[
{
"created": "Wed, 16 May 2018 16:14:52 GMT",
"version": "v1"
}
] |
2018-07-25
|
[
[
"Carvalho",
"Alexandra",
""
],
[
"Moretti",
"Stefano",
""
],
[
"O'Brien",
"Dermot",
""
],
[
"Panizzi",
"Luca",
""
],
[
"Prager",
"Hugo",
""
]
] |
Vector-Like Quarks (VLQs) are predicted by several theoretical scenarios of new physics and, having colour quantum numbers, can copiously be produced at the Large Hadron Collider (LHC), so long that their mass is in the testable kinematic regime of such a machine. While it would be convenient to assume that such objects are narrow and can be treated in the so-called Narrow Width Approximation (NWA), this is not always possible, owing to the fact that couplings and particle content of such new physics scenarios are not generally constrained, so that a large value of the former and/or a large variety of VLQ decay channels into the latter can contribute to generate a large decay width for such extra quarks. We have addressed here the issue of how best to tackle in LHC analysis the presence of large (and model-dependent) interference effects between different VLQ production and decay channels as well as between these and the corresponding irreducible background. We have confined ourselves to the case of single production of VLQs, which is rapidly becoming a channel of choice in experimental searches owing to the ever increasing limits on their mass, in turn depleting the yield of the historically well-established double production channel. Indeed, this poses a further challenge, as the former is model-dependent while the latter is essentially not. Despite these conditions, we show here that an efficient approach is possible, which retains to a large extent a degree of model independence in phenomenological studies of such VLQ dynamics at the LHC.
|
0810.3984
|
Seung-il Nam
|
Seung-il Nam
|
Scalar susceptibility from the instanton vacuum with meson-loop
corrections
|
11 pages, 3 figures, accepted for publication in Phys.Rev.D
|
Phys.Rev.D79:014008,2009
|
10.1103/PhysRevD.79.014008
|
YITP-08-65
|
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
The scalar susceptibility (chi_s) of QCD, which represents the response of
the chiral condensate to a small perturbation of explicit chiral-symmetry
breaking, is investigated within the nonlocal chiral quark model (NLchiQM)
based on the instanton vacuum configuration for N_f = 2. We also take into
account 1/N_c meson-loop (ML) corrections including scalar and pseudoscalar
mesons. It turns out that the chiral condensate is modified to a large extend
by the ML corrections in the vicinity of m = 0, whereas its effect becomes weak
beyond m ~ 100 MeV. As numerical results, we find that chi_s = -0.34 GeV^2 with
the ML corrections and 0.18 GeV^2 without it, respectively. From these
observations, we conclude that the ML corrections play an important role in the
presence of finite current-quark mass.
|
[
{
"created": "Wed, 22 Oct 2008 07:35:20 GMT",
"version": "v1"
},
{
"created": "Mon, 5 Jan 2009 13:49:23 GMT",
"version": "v2"
}
] |
2010-04-21
|
[
[
"Nam",
"Seung-il",
""
]
] |
The scalar susceptibility (chi_s) of QCD, which represents the response of the chiral condensate to a small perturbation of explicit chiral-symmetry breaking, is investigated within the nonlocal chiral quark model (NLchiQM) based on the instanton vacuum configuration for N_f = 2. We also take into account 1/N_c meson-loop (ML) corrections including scalar and pseudoscalar mesons. It turns out that the chiral condensate is modified to a large extend by the ML corrections in the vicinity of m = 0, whereas its effect becomes weak beyond m ~ 100 MeV. As numerical results, we find that chi_s = -0.34 GeV^2 with the ML corrections and 0.18 GeV^2 without it, respectively. From these observations, we conclude that the ML corrections play an important role in the presence of finite current-quark mass.
|
hep-ph/9905262
|
Teiji Kunihiro
|
Teiji Kunihiro
|
Significance of the Sigma Meson in Hadron Physics (QCD) and Possible
Experiments to Observe it
|
Invited talk presented at the Workshop on Hadron Spectroscopy
(whs99), Frascati- INFN, March 8 - 12, 1999. 8 pages with one figure
| null | null | null |
hep-ph hep-ex nucl-ex nucl-th
| null |
We first discuss the theoretical and phenomenological significance of the
sigma meson ($\sigma$) in QCD. It is indicated that if the collective modes
with the mass 500-600 MeV exists in the $I=J=0$ channel, various empirical
facts in hadron physics can be naturally accounted for, which otherwise would
remain mysterious. We propose several experiments to produce and detect the
$\sigma$ in nuclei using nuclear and electro-magnetic projectiles. The recent
CHAOS data which show a spectral enhancement near the 2 $m_{\pi}$ threshold in
the $\sigma$ channel from the reactions A$(\pi, 2\pi)$A' where A and A' denotes
nuclei is interpreted as a possible evidence of a partial restoration of chiral
symmetry in nuclei.
|
[
{
"created": "Thu, 6 May 1999 11:32:40 GMT",
"version": "v1"
}
] |
2007-05-23
|
[
[
"Kunihiro",
"Teiji",
""
]
] |
We first discuss the theoretical and phenomenological significance of the sigma meson ($\sigma$) in QCD. It is indicated that if the collective modes with the mass 500-600 MeV exists in the $I=J=0$ channel, various empirical facts in hadron physics can be naturally accounted for, which otherwise would remain mysterious. We propose several experiments to produce and detect the $\sigma$ in nuclei using nuclear and electro-magnetic projectiles. The recent CHAOS data which show a spectral enhancement near the 2 $m_{\pi}$ threshold in the $\sigma$ channel from the reactions A$(\pi, 2\pi)$A' where A and A' denotes nuclei is interpreted as a possible evidence of a partial restoration of chiral symmetry in nuclei.
|
hep-ph/9510230
| null |
A. Jakovac, A. Patkos, P. Petreczky
|
Controlling a Non-Polynomial Reduced Finite Temperature Action in the
U(1) Higgs Model
|
12 pages, LaTeX, 1 figure appended
|
Phys.Lett.B367:283-289,1996
|
10.1016/0370-2693(95)01387-3
| null |
hep-ph
| null |
An effective theory is constructed for the scalar electrodynamics via 2-loop
integration over all non-static fields and the screened electric component of
the vector-potential. Non-polynomial terms of the action are preserved and
included into the 2-loop calculation of the effective potential of the reduced
theory. Also the inclusion of some non-local terms is shown to be important.
The effect of non-polynomial operators on the symmetry restoring phase
transition is quantitatively compared to results from a local,
superrenormalisable approximate effective theory.
|
[
{
"created": "Thu, 5 Oct 1995 12:29:12 GMT",
"version": "v1"
}
] |
2014-11-17
|
[
[
"Jakovac",
"A.",
""
],
[
"Patkos",
"A.",
""
],
[
"Petreczky",
"P.",
""
]
] |
An effective theory is constructed for the scalar electrodynamics via 2-loop integration over all non-static fields and the screened electric component of the vector-potential. Non-polynomial terms of the action are preserved and included into the 2-loop calculation of the effective potential of the reduced theory. Also the inclusion of some non-local terms is shown to be important. The effect of non-polynomial operators on the symmetry restoring phase transition is quantitatively compared to results from a local, superrenormalisable approximate effective theory.
|
hep-ph/0404056
|
Anindya Datta
|
Anindya Datta, Katri Huitu, Jari Laamanen, Biswarup Mukhopadhyaya
|
Invisible Higgs in theories of large extra dimensions
|
13 pages, 4 figures, Latex
|
Phys.Rev. D70 (2004) 075003
|
10.1103/PhysRevD.70.075003
| null |
hep-ph
| null |
We discuss the possibility of detecting a Higgs boson in future collider
experiments if large extra dimensions are realized in nature. In such a case,
the Higgs boson can decay invisibly by oscillating into a graviscalar
Kaluza-Klein (KK) tower. We show that the search for such a Higgs at an $e^+
e^-$ linear collider entails more complications than are usually thought of in
relation to an invisibly decaying Higgs, the main sources of such complications
being the simultaneous presence of a continuum graviton production and the
broadening of the Higgs peak. We discuss possible ways of overcoming such
difficulties, and conclude that the detection of such a Higgs boson might still
be a problem beyond the mass range of 250-300 GeV.
|
[
{
"created": "Tue, 6 Apr 2004 14:13:07 GMT",
"version": "v1"
}
] |
2009-11-10
|
[
[
"Datta",
"Anindya",
""
],
[
"Huitu",
"Katri",
""
],
[
"Laamanen",
"Jari",
""
],
[
"Mukhopadhyaya",
"Biswarup",
""
]
] |
We discuss the possibility of detecting a Higgs boson in future collider experiments if large extra dimensions are realized in nature. In such a case, the Higgs boson can decay invisibly by oscillating into a graviscalar Kaluza-Klein (KK) tower. We show that the search for such a Higgs at an $e^+ e^-$ linear collider entails more complications than are usually thought of in relation to an invisibly decaying Higgs, the main sources of such complications being the simultaneous presence of a continuum graviton production and the broadening of the Higgs peak. We discuss possible ways of overcoming such difficulties, and conclude that the detection of such a Higgs boson might still be a problem beyond the mass range of 250-300 GeV.
|
1604.06447
|
Gudrun Heinrich
|
S. Borowka, N. Greiner, G. Heinrich, S.P. Jones, M. Kerner, J.
Schlenk, U. Schubert, T. Zirke
|
Higgs boson pair production in gluon fusion at NLO with full top-quark
mass dependence
|
Version published in PRL, v2: results at 13 TeV (v1 was at 14 TeV),
minor correction to virtual part included, conclusions unchanged
|
Phys. Rev. Lett. 117, 012001 (2016)
|
10.1103/PhysRevLett.117.012001
|
MPP-2016-80, NSF-KITP-16-040,ZH-TH-14/16
|
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We present the calculation of the cross section and invariant mass
distribution for Higgs boson pair production in gluon fusion at next-to-leading
order (NLO) in QCD. Top-quark masses are fully taken into account throughout
the calculation. The virtual two-loop amplitude has been generated using an
extension of the program GoSam supplemented with an interface to Reduze for the
integral reduction. The occurring integrals have been calculated numerically
using the program SecDec. Our results, including the full top-quark mass
dependence for the first time, allow us to assess the validity of various
approximations proposed in the literature, which we also recalculate. We find
substantial deviations between the NLO result and the different approximations,
which emphasizes the importance of including the full top-quark mass dependence
at NLO.
|
[
{
"created": "Thu, 21 Apr 2016 19:57:25 GMT",
"version": "v1"
},
{
"created": "Mon, 1 Aug 2016 16:52:49 GMT",
"version": "v2"
}
] |
2016-08-02
|
[
[
"Borowka",
"S.",
""
],
[
"Greiner",
"N.",
""
],
[
"Heinrich",
"G.",
""
],
[
"Jones",
"S. P.",
""
],
[
"Kerner",
"M.",
""
],
[
"Schlenk",
"J.",
""
],
[
"Schubert",
"U.",
""
],
[
"Zirke",
"T.",
""
]
] |
We present the calculation of the cross section and invariant mass distribution for Higgs boson pair production in gluon fusion at next-to-leading order (NLO) in QCD. Top-quark masses are fully taken into account throughout the calculation. The virtual two-loop amplitude has been generated using an extension of the program GoSam supplemented with an interface to Reduze for the integral reduction. The occurring integrals have been calculated numerically using the program SecDec. Our results, including the full top-quark mass dependence for the first time, allow us to assess the validity of various approximations proposed in the literature, which we also recalculate. We find substantial deviations between the NLO result and the different approximations, which emphasizes the importance of including the full top-quark mass dependence at NLO.
|
0907.4723
|
Michal Czakon
|
G. Bevilacqua, M. Czakon, C. G. Papadopoulos, R. Pittau and M. Worek
|
Assault on the NLO Wishlist: pp -> tt bb
|
19 pages, 11 figures, 2 tables. References added, version to appear
in JHEP
|
JHEP 0909:109,2009
|
10.1088/1126-6708/2009/09/109
|
PITHA 09/18, WUB/09-09
|
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We present the results of a next-to-leading order calculation of QCD
corrections to the production of an on-shell top-anti-top quark pair in
association with two flavored b-jets. Besides studying the total cross section
and its scale dependence, we give several differential distributions. Where
comparable, our results agree with a previous analysis. While the process under
scrutiny is of major relevance for Higgs boson searches at the LHC, we use it
to demonstrate the ability of our system built around Helac-Phegas to tackle
complete calculations at the frontier of current studies for the LHC. On the
technical side, we show how the virtual corrections are efficiently computed
with Helac-1Loop, based on the OPP method and the reduction code CutTools,
using reweighting and Monte Carlo over color configurations and polarizations.
As far as the real corrections are concerned, we use the recently published
Helac-Dipoles package. In connection with improvements of the latter, we give
the last missing integrated dipole formulae necessary for a complete
implementation of phase space restriction dependence in the massive dipole
subtraction formalism.
|
[
{
"created": "Mon, 27 Jul 2009 18:18:48 GMT",
"version": "v1"
},
{
"created": "Wed, 9 Sep 2009 10:52:12 GMT",
"version": "v2"
}
] |
2009-09-25
|
[
[
"Bevilacqua",
"G.",
""
],
[
"Czakon",
"M.",
""
],
[
"Papadopoulos",
"C. G.",
""
],
[
"Pittau",
"R.",
""
],
[
"Worek",
"M.",
""
]
] |
We present the results of a next-to-leading order calculation of QCD corrections to the production of an on-shell top-anti-top quark pair in association with two flavored b-jets. Besides studying the total cross section and its scale dependence, we give several differential distributions. Where comparable, our results agree with a previous analysis. While the process under scrutiny is of major relevance for Higgs boson searches at the LHC, we use it to demonstrate the ability of our system built around Helac-Phegas to tackle complete calculations at the frontier of current studies for the LHC. On the technical side, we show how the virtual corrections are efficiently computed with Helac-1Loop, based on the OPP method and the reduction code CutTools, using reweighting and Monte Carlo over color configurations and polarizations. As far as the real corrections are concerned, we use the recently published Helac-Dipoles package. In connection with improvements of the latter, we give the last missing integrated dipole formulae necessary for a complete implementation of phase space restriction dependence in the massive dipole subtraction formalism.
|
2310.02316
|
Greg Suczewski
|
Rouven Essig, Yonit Hochberg, Yutaro Shoji, Aman Singal, Gregory
Suczewski
|
Low-Energy Compton Scattering in Materials
|
5 figures, 9 pages + references
| null | null | null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Low-energy Compton scattering is an important background for sub-GeV dark
matter direct-detection and other experiments. Current Compton scattering
calculations typically rely on assumptions that are not valid in the low-energy
region of interest, beneath ~ 50 eV. Here we relate the low-energy Compton
scattering differential cross section to the dielectric response of the
material. Our new approach can be used for a wide range of materials and
includes all-electron, band structure, and collective effects, which can be
particularly relevant at low energies. We demonstrate the strength of our
approach in several solid-state systems, in particular Si, Ge, GaAs, and SiC,
which are relevant for current and proposed experiments searching for dark
matter, neutrinos, and millicharged particles.
|
[
{
"created": "Tue, 3 Oct 2023 18:00:05 GMT",
"version": "v1"
}
] |
2023-10-05
|
[
[
"Essig",
"Rouven",
""
],
[
"Hochberg",
"Yonit",
""
],
[
"Shoji",
"Yutaro",
""
],
[
"Singal",
"Aman",
""
],
[
"Suczewski",
"Gregory",
""
]
] |
Low-energy Compton scattering is an important background for sub-GeV dark matter direct-detection and other experiments. Current Compton scattering calculations typically rely on assumptions that are not valid in the low-energy region of interest, beneath ~ 50 eV. Here we relate the low-energy Compton scattering differential cross section to the dielectric response of the material. Our new approach can be used for a wide range of materials and includes all-electron, band structure, and collective effects, which can be particularly relevant at low energies. We demonstrate the strength of our approach in several solid-state systems, in particular Si, Ge, GaAs, and SiC, which are relevant for current and proposed experiments searching for dark matter, neutrinos, and millicharged particles.
|
1406.0082
|
Mikhail Voloshin
|
Xin Li and M.B. Voloshin
|
Contribution of $Z_b$ resonances to $\Upsilon(5S) \to \pi \pi \pi
\chi_b$
|
7 pages, 1 figure
|
Phys. Rev. D 90, 014036 (2014)
|
10.1103/PhysRevD.90.014036
|
FTPI-MINN-14/13, UMN-TH-3336/14
|
hep-ph hep-ex
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We discuss the recently presented Belle results on the decays $\Upsilon(5S)
\to \pi \pi \pi \chi_{bJ}(1P)$. The data indicate that in addition to the
$\omega$ emission, $\Upsilon(5S) \to \omega \chi_{bJ}$, there is a significant
non resonant background in the three pion spectrum. We suggest that a sizable
fraction of this background may be associated with the cascade process
$\Upsilon(5S) \to \pi Z_b \to \pi \rho \chi_b$ involving the $Z_b(10610)$ and
$Z_b(10650)$ resonances. If confirmed by the data, this would be the first
observation of transition from the $Z_b$ resonances to lower bottomonium with
emission of a light meson state different from a single pion, which may provide
a new input in understanding of the internal dynamics of these resonances.
|
[
{
"created": "Sat, 31 May 2014 15:16:50 GMT",
"version": "v1"
}
] |
2014-07-30
|
[
[
"Li",
"Xin",
""
],
[
"Voloshin",
"M. B.",
""
]
] |
We discuss the recently presented Belle results on the decays $\Upsilon(5S) \to \pi \pi \pi \chi_{bJ}(1P)$. The data indicate that in addition to the $\omega$ emission, $\Upsilon(5S) \to \omega \chi_{bJ}$, there is a significant non resonant background in the three pion spectrum. We suggest that a sizable fraction of this background may be associated with the cascade process $\Upsilon(5S) \to \pi Z_b \to \pi \rho \chi_b$ involving the $Z_b(10610)$ and $Z_b(10650)$ resonances. If confirmed by the data, this would be the first observation of transition from the $Z_b$ resonances to lower bottomonium with emission of a light meson state different from a single pion, which may provide a new input in understanding of the internal dynamics of these resonances.
|
2110.14981
|
Piotr Lebiedowicz
|
Piotr Lebiedowicz
|
Exclusive $pp \to pp K^{*0} \bar{K}^{*0}$ reaction: $f_{2}(1950)$
resonance versus diffractive continuum
|
presented at EPS-HEP2021, 26-30 July 2021
| null | null | null |
hep-ph
|
http://creativecommons.org/licenses/by/4.0/
|
The exclusive reaction $pp \to pp (K^{*0} \bar{K}^{*0} \to
K^{+}\pi^{-}K^{-}\pi^{+})$ for the LHC experiments is discussed. The amplitudes
for the reaction are formulated within the tensor-pomeron approach. We consider
two diffractive mechanisms: the $f_{2}(1950)$ $s$-channel exchange mechanism
and the $K^{*0}$-exchange mechanism. First mechanism is a candidate for central
diffractive production of tensor glueball and the second one is an irreducible
continuum. Comparison with data from WA102 experiment are made and predictions
for LHC experiments are given. We find that including the continuum
contribution alone one can describe the WA102 data reasonably well. A similar
behaviour of the continuum and resonance contributions makes an identification
of a broad tensor-glueball state in this reaction rather difficult.
|
[
{
"created": "Thu, 28 Oct 2021 09:44:18 GMT",
"version": "v1"
}
] |
2021-10-29
|
[
[
"Lebiedowicz",
"Piotr",
""
]
] |
The exclusive reaction $pp \to pp (K^{*0} \bar{K}^{*0} \to K^{+}\pi^{-}K^{-}\pi^{+})$ for the LHC experiments is discussed. The amplitudes for the reaction are formulated within the tensor-pomeron approach. We consider two diffractive mechanisms: the $f_{2}(1950)$ $s$-channel exchange mechanism and the $K^{*0}$-exchange mechanism. First mechanism is a candidate for central diffractive production of tensor glueball and the second one is an irreducible continuum. Comparison with data from WA102 experiment are made and predictions for LHC experiments are given. We find that including the continuum contribution alone one can describe the WA102 data reasonably well. A similar behaviour of the continuum and resonance contributions makes an identification of a broad tensor-glueball state in this reaction rather difficult.
|
1401.2461
|
Eric Carlson
|
Eric Carlson, Adam Coogan, Tim Linden, Stefano Profumo, Alejandro
Ibarra, Sebastian Wild
|
Antihelium from Dark Matter
|
9 Pages, 4 Figures, Accepted by PRD
| null |
10.1103/PhysRevD.89.076005
| null |
hep-ph astro-ph.HE
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Cosmic-ray anti-nuclei provide a promising discovery channel for the indirect
detection of particle dark matter. Hadron showers produced by the
pair-annihilation or decay of Galactic dark matter generate anti-nucleons which
can in turn form light anti-nuclei. Previous studies have only focused on the
spectrum and flux of low energy antideuterons which, although very rarely, are
occasionally also produced by cosmic-ray spallation. Heavier elements
($A\geq3$) have instead entirely negligible astrophysical background and a
primary yield from dark matter which could be detectable by future experiments.
Using a Monte Carlo event generator and an event-by-event phase space analysis,
we compute, for the first time, the production spectrum of \antihe and \antiT
for dark matter annihilating or decaying to $b\bar{b}$ and ${W^+}{W^-}$ final
states. We then employ a semi-analytic model of interstellar and heliospheric
propagation to calculate the \antihe flux as well as to provide tools to relate
the anti-helium spectrum corresponding to an arbitrary antideuteron spectrum.
Finally, we discuss prospects for current and future experiments, including
GAPS and AMS-02.
|
[
{
"created": "Fri, 10 Jan 2014 21:00:11 GMT",
"version": "v1"
},
{
"created": "Wed, 19 Mar 2014 00:40:58 GMT",
"version": "v2"
}
] |
2015-06-18
|
[
[
"Carlson",
"Eric",
""
],
[
"Coogan",
"Adam",
""
],
[
"Linden",
"Tim",
""
],
[
"Profumo",
"Stefano",
""
],
[
"Ibarra",
"Alejandro",
""
],
[
"Wild",
"Sebastian",
""
]
] |
Cosmic-ray anti-nuclei provide a promising discovery channel for the indirect detection of particle dark matter. Hadron showers produced by the pair-annihilation or decay of Galactic dark matter generate anti-nucleons which can in turn form light anti-nuclei. Previous studies have only focused on the spectrum and flux of low energy antideuterons which, although very rarely, are occasionally also produced by cosmic-ray spallation. Heavier elements ($A\geq3$) have instead entirely negligible astrophysical background and a primary yield from dark matter which could be detectable by future experiments. Using a Monte Carlo event generator and an event-by-event phase space analysis, we compute, for the first time, the production spectrum of \antihe and \antiT for dark matter annihilating or decaying to $b\bar{b}$ and ${W^+}{W^-}$ final states. We then employ a semi-analytic model of interstellar and heliospheric propagation to calculate the \antihe flux as well as to provide tools to relate the anti-helium spectrum corresponding to an arbitrary antideuteron spectrum. Finally, we discuss prospects for current and future experiments, including GAPS and AMS-02.
|
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