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|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
1912.03676
|
Quan-Yi Hu
|
Quan-Yi Hu and Lin-Lin Huang
|
Explaining $b\to s \ell^+ \ell^-$ data by sneutrinos in the $R$-parity
violating MSSM
|
6 pages, 2 figures, matches to the version published in PRD
|
Phys. Rev. D 101, 035030 (2020)
|
10.1103/PhysRevD.101.035030
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
The recent measurements on $b\to s \ell^+ \ell^-$ processes suggest the
existence of lepton-flavour-universality breaking new physics. In this work, we
have explored the possibility of explaining these data by sneutrinos in the
$R$-parity violating minimal supersymmetric standard model. We study the light
sneutrinos, of order 1 TeV, and suppose that the rest of the sfermions are much
heavier than them. This setup can solve the $b \to s \mu^+ \mu^-$ anomaly well,
and it is almost unconstrained by other related processes, such as
$B_s-\bar{B}_s$ mixing, as well as $B_s^0 \to \tau^+ \tau^-$, $B^+ \to K^+
\tau^+ \tau^-$, $B_s^0 \to \tau^\pm \mu^\mp$, $B^+ \to K^+ \tau^\pm \mu^\mp$,
and $B \to K^{(\ast)} \nu \bar{\nu}$ decays.
|
[
{
"created": "Sun, 8 Dec 2019 13:38:13 GMT",
"version": "v1"
},
{
"created": "Fri, 24 Jan 2020 06:33:52 GMT",
"version": "v2"
},
{
"created": "Sat, 22 Feb 2020 03:44:56 GMT",
"version": "v3"
}
] |
2020-02-26
|
[
[
"Hu",
"Quan-Yi",
""
],
[
"Huang",
"Lin-Lin",
""
]
] |
The recent measurements on $b\to s \ell^+ \ell^-$ processes suggest the existence of lepton-flavour-universality breaking new physics. In this work, we have explored the possibility of explaining these data by sneutrinos in the $R$-parity violating minimal supersymmetric standard model. We study the light sneutrinos, of order 1 TeV, and suppose that the rest of the sfermions are much heavier than them. This setup can solve the $b \to s \mu^+ \mu^-$ anomaly well, and it is almost unconstrained by other related processes, such as $B_s-\bar{B}_s$ mixing, as well as $B_s^0 \to \tau^+ \tau^-$, $B^+ \to K^+ \tau^+ \tau^-$, $B_s^0 \to \tau^\pm \mu^\mp$, $B^+ \to K^+ \tau^\pm \mu^\mp$, and $B \to K^{(\ast)} \nu \bar{\nu}$ decays.
|
1607.02500
|
Debajyoti Dutta
|
Debajyoti Dutta and Pomita Ghoshal
|
Probing CP violation with T2K, NO$\nu$A and DUNE in the presence of
non-unitarity
|
22 pages, 9 figures
|
JHEP09(2016)110
|
10.1007/JHEP09(2016)110
| null |
hep-ph
|
http://creativecommons.org/publicdomain/zero/1.0/
|
The presence of non-unitary neutrino mixing can affect the measurement of the
three-neutrino leptonic Dirac CP phase and hamper efforts to probe CP violation
due to degeneracies of the extra non-unitary CP phase with the standard CP
phase. We study the effect of including non-unitarity on probing CP violation
with the long-baseline experiments NO$\nu$A, T2K and DUNE. We analyze the
effect of non-unitary mixing at the level of oscillation probabilities
associated with the relevant baselines, and present the CP violation
sensitivity for the individual experiments and their combination. Our results
show that there is an improvement in the CP violation sensitivity of the
combination compared to the individual experiments.
|
[
{
"created": "Fri, 8 Jul 2016 19:45:52 GMT",
"version": "v1"
},
{
"created": "Mon, 8 Aug 2016 09:06:51 GMT",
"version": "v2"
},
{
"created": "Wed, 21 Sep 2016 11:38:39 GMT",
"version": "v3"
}
] |
2016-09-22
|
[
[
"Dutta",
"Debajyoti",
""
],
[
"Ghoshal",
"Pomita",
""
]
] |
The presence of non-unitary neutrino mixing can affect the measurement of the three-neutrino leptonic Dirac CP phase and hamper efforts to probe CP violation due to degeneracies of the extra non-unitary CP phase with the standard CP phase. We study the effect of including non-unitarity on probing CP violation with the long-baseline experiments NO$\nu$A, T2K and DUNE. We analyze the effect of non-unitary mixing at the level of oscillation probabilities associated with the relevant baselines, and present the CP violation sensitivity for the individual experiments and their combination. Our results show that there is an improvement in the CP violation sensitivity of the combination compared to the individual experiments.
|
2402.01395
|
Vanessa Zema
|
V. Zema, P. Figueroa, G. Angloher, M. R. Bharadwaj, T. Frank, M. N.
Hughes, M. Kellermann, F. Pr\"obst, K. Sch\"affner, K. Shera, and M.
Stahlberg
|
Dark Matter-Electron Scattering Search Using Cryogenic Light Detectors
| null | null | null | null |
hep-ph astro-ph.CO hep-ex
|
http://creativecommons.org/licenses/by/4.0/
|
The CSC (cryogenic scintillating calorimeter) technology devoted to rare
event searches is reaching the sensitivity level required for the hunt of dark
matter-electron scatterings. Dark matter-electron interactions in scintillating
targets are expected to stimulate the emission of single photons, each of
energy equal to the target electronic band gap. The electronic band gap in
scintillators like NaI/GaAs is of O(eV). The search for this signal can be done
by an array of cryogenic light detectors with eV/sub-eV energy resolution. In
this work, we describe the detection principle, the detector response and the
envisioned detector design to search for dark matter interacting with electrons
via the measurement of the scintillation light at millikelvin. First
sensitivity projections are provided, which show the potential of this
research.
|
[
{
"created": "Fri, 2 Feb 2024 13:19:53 GMT",
"version": "v1"
}
] |
2024-02-05
|
[
[
"Zema",
"V.",
""
],
[
"Figueroa",
"P.",
""
],
[
"Angloher",
"G.",
""
],
[
"Bharadwaj",
"M. R.",
""
],
[
"Frank",
"T.",
""
],
[
"Hughes",
"M. N.",
""
],
[
"Kellermann",
"M.",
""
],
[
"Pröbst",
"F.",
""
],
[
"Schäffner",
"K.",
""
],
[
"Shera",
"K.",
""
],
[
"Stahlberg",
"M.",
""
]
] |
The CSC (cryogenic scintillating calorimeter) technology devoted to rare event searches is reaching the sensitivity level required for the hunt of dark matter-electron scatterings. Dark matter-electron interactions in scintillating targets are expected to stimulate the emission of single photons, each of energy equal to the target electronic band gap. The electronic band gap in scintillators like NaI/GaAs is of O(eV). The search for this signal can be done by an array of cryogenic light detectors with eV/sub-eV energy resolution. In this work, we describe the detection principle, the detector response and the envisioned detector design to search for dark matter interacting with electrons via the measurement of the scintillation light at millikelvin. First sensitivity projections are provided, which show the potential of this research.
|
hep-ph/9809477
|
Michel Tytgat
|
Robert D. Pisarski, T.L. Trueman and Michel H.G. Tytgat
|
Hard thermal loops effective action for piO -> gamma gamma
|
4 pages, revtex. Talk given by M. Tytgat at the 5th International
Workshop on Thermal Field Theories and their Applications, Regensburg
(Germany), August 1998
| null | null | null |
hep-ph
| null |
I consider the low temperature correction to the anomalous coupling of a
neutral pion to two photons from an effective Lagrangian point of view.
|
[
{
"created": "Tue, 22 Sep 1998 14:22:22 GMT",
"version": "v1"
}
] |
2007-05-23
|
[
[
"Pisarski",
"Robert D.",
""
],
[
"Trueman",
"T. L.",
""
],
[
"Tytgat",
"Michel H. G.",
""
]
] |
I consider the low temperature correction to the anomalous coupling of a neutral pion to two photons from an effective Lagrangian point of view.
|
1201.0117
|
Zbigniew Was
|
Z. Czyczula, T. Przedzinski and Z. Was
|
TauSpinner program for studies on spin effect in tau production at the
LHC
|
13 pages, 6 figures New feature, an algorithm to attribute tau
helicity states introduced in v2
| null |
10.1140/epjc/s10052-012-1988-z
|
CERN-PH-TH/20011-307
|
hep-ph hep-ex
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Final states involving tau leptons are important components of searches for
new particles at the Large Hadron Collider (LHC). A proper treatment of tau
spin effects in the Monte Carlo (MC) simulations is important for understanding
the detector acceptance as well as for the measurements of tau polarization and
tau spin correlations. In this note we present a TauSpinner package designed to
simulate the spin effects. It relies on the availability of the four-momenta of
the taus and their decay products in the analyzed data. The flavor and the
four-momentum of the boson decaying to the tau-tau+ or tau+- nu pair need to be
known. In the Z/gamma* case the initial state quark configuration is attributed
from the intermediate boson kinematics, and the parton distribution functions
(PDF's). TauSpinner is the first algorithm suitable for emulation of tau spin
effects in tau-embedded samples. It is also the first tool that offers the user
the flexibility to simulate a desired spin effect at the analysis level. An
algorithm to attribute tau helicity states to a previously generated sample is
also provided.
|
[
{
"created": "Fri, 30 Dec 2011 12:48:55 GMT",
"version": "v1"
},
{
"created": "Sat, 17 Mar 2012 21:07:39 GMT",
"version": "v2"
}
] |
2015-06-03
|
[
[
"Czyczula",
"Z.",
""
],
[
"Przedzinski",
"T.",
""
],
[
"Was",
"Z.",
""
]
] |
Final states involving tau leptons are important components of searches for new particles at the Large Hadron Collider (LHC). A proper treatment of tau spin effects in the Monte Carlo (MC) simulations is important for understanding the detector acceptance as well as for the measurements of tau polarization and tau spin correlations. In this note we present a TauSpinner package designed to simulate the spin effects. It relies on the availability of the four-momenta of the taus and their decay products in the analyzed data. The flavor and the four-momentum of the boson decaying to the tau-tau+ or tau+- nu pair need to be known. In the Z/gamma* case the initial state quark configuration is attributed from the intermediate boson kinematics, and the parton distribution functions (PDF's). TauSpinner is the first algorithm suitable for emulation of tau spin effects in tau-embedded samples. It is also the first tool that offers the user the flexibility to simulate a desired spin effect at the analysis level. An algorithm to attribute tau helicity states to a previously generated sample is also provided.
|
0902.0170
|
Gabriel Shaughnessy
|
Vernon Barger, Heather E. Logan, Gabe Shaughnessy
|
Higgs ID at the LHC
|
46 pages, 6 figures, 2 tables, PRD version
|
Phys.Rev.D79:115018,2009
|
10.1103/PhysRevD.79.115018
|
MADPH-08-1515, ANL-HEP-PR-09-3, NUHEP-TH/09-02
|
hep-ph hep-ex
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We make a complete catalog of extended Higgs sectors involving SU(2)_L
doublets and singlets, subject to natural flavor conservation. In each case we
present the couplings of a light neutral CP-even Higgs state h in terms of the
model parameters, and identify which models are distinguishable in principle
based on this information. We also give explicit expressions for the model
parameters in terms of h couplings and exhibit the behaviors of the couplings
in the limit where the deviations from the Standard Model Higgs couplings are
small. Finally we discuss prospects for differentiation of extended Higgs
models based on measurements at the LHC and ILC and identify the regions in
which these experiments could detect deviations from the SM Higgs predictions.
|
[
{
"created": "Sun, 1 Feb 2009 21:06:41 GMT",
"version": "v1"
},
{
"created": "Tue, 9 Jun 2009 22:30:59 GMT",
"version": "v2"
}
] |
2010-04-21
|
[
[
"Barger",
"Vernon",
""
],
[
"Logan",
"Heather E.",
""
],
[
"Shaughnessy",
"Gabe",
""
]
] |
We make a complete catalog of extended Higgs sectors involving SU(2)_L doublets and singlets, subject to natural flavor conservation. In each case we present the couplings of a light neutral CP-even Higgs state h in terms of the model parameters, and identify which models are distinguishable in principle based on this information. We also give explicit expressions for the model parameters in terms of h couplings and exhibit the behaviors of the couplings in the limit where the deviations from the Standard Model Higgs couplings are small. Finally we discuss prospects for differentiation of extended Higgs models based on measurements at the LHC and ILC and identify the regions in which these experiments could detect deviations from the SM Higgs predictions.
|
hep-ph/0207248
|
Debajyoti Choudhury
|
Debajyoti Choudhury, Rohini M. Godbole and Giacomo Polesello
|
Measuring R-parity-violating couplings in dilepton production at the LHC
|
28 pages, 14 figures (uses JHEP3.cls)
|
JHEP 0208 (2002) 004
|
10.1088/1126-6708/2002/08/004
|
MRI-P-020702, CERN-TH/2002-142, IISC-CTS-09/02, ATL-PHYS-2002-016
|
hep-ph
| null |
We revisit the issue of probing R-violating couplings of supersymmetric
theories at hadronic colliders, particularly at the LHC. Concentrating on
dimuon production, an evaluation of the optimal sensitivity to the R-violating
coupling is performed through a maximum likelihood analysis. The measurement
uncertainties are evaluated through a study of fully generated events processed
through a fast simulation of the ATLAS detector. It is found that a host of
R-violating couplings can be measured to a statistical accuracy of better than
10%, over a significant part of the m_{tilde f} -- lambda parameter space still
allowed by low energy measurements. Since the bounds thus obtained do not
simply scale as the squark mass, one can do significantly better at the LHC
than at the Tevatron. The same analysis can also be extended to assess the
reach of the LHC to effects due to any non-SM structure of the four-fermion
amplitude, caused by exchanges of new particles with different spins such as
leptoquarks and gravitons that are suggested by various theoretical ideas.
|
[
{
"created": "Fri, 19 Jul 2002 23:06:31 GMT",
"version": "v1"
}
] |
2009-11-07
|
[
[
"Choudhury",
"Debajyoti",
""
],
[
"Godbole",
"Rohini M.",
""
],
[
"Polesello",
"Giacomo",
""
]
] |
We revisit the issue of probing R-violating couplings of supersymmetric theories at hadronic colliders, particularly at the LHC. Concentrating on dimuon production, an evaluation of the optimal sensitivity to the R-violating coupling is performed through a maximum likelihood analysis. The measurement uncertainties are evaluated through a study of fully generated events processed through a fast simulation of the ATLAS detector. It is found that a host of R-violating couplings can be measured to a statistical accuracy of better than 10%, over a significant part of the m_{tilde f} -- lambda parameter space still allowed by low energy measurements. Since the bounds thus obtained do not simply scale as the squark mass, one can do significantly better at the LHC than at the Tevatron. The same analysis can also be extended to assess the reach of the LHC to effects due to any non-SM structure of the four-fermion amplitude, caused by exchanges of new particles with different spins such as leptoquarks and gravitons that are suggested by various theoretical ideas.
|
hep-ph/0702285
|
Kristian McDonald
|
Andrew Coulthurst, Jason Doukas, Kristian L. McDonald
|
Combining Left-Right And Quark-Lepton Symmetries In 5D
|
16 pages with 3 figures; V2 is PRD version
|
Phys.Rev.D76:105020,2007
|
10.1103/PhysRevD.76.105020
| null |
hep-ph
| null |
A five dimensional model containing both left-right and quark-lepton
symmetries is constructed, with the gauge group broken by a combination of
orbifold compactification and the Higgs mechanism. An analysis of the gauge and
scalar sectors is performed and it is shown that the 5d model admits a simpler
scalar sector. Bounds on the relevant symmetry breaking scales are obtained and
reveal that two neutral gauge bosons may appear in the TeV energy range to be
explored by the LHC. Split fermions are employed to remove the mass relations
implied by the quark-lepton symmetry and the necessary fermion localisation is
achieved by introducing bulk scalars with kink vacuum profiles. The symmetries
of the model constrain the Yukawa sector, which in turn severely constrains the
extent to which realistic split fermion scenarios may be realized in the
absence of Yukawa coupling hierarchies. Nevertheless we present two interesting
one generation constructs. One of these provides a rationale for $m_t>m_b,
m_{\tau}$ and $m_\nu\ll m_t$ with Yukawa parameters which vary by only a factor
of five. The other also suppresses the proton decay rate by spatially
separating quarks and leptons but requires a Yukawa parameter hierarchy of
order $10^2$.
|
[
{
"created": "Wed, 28 Feb 2007 06:38:51 GMT",
"version": "v1"
},
{
"created": "Wed, 14 Nov 2007 04:12:31 GMT",
"version": "v2"
}
] |
2008-11-26
|
[
[
"Coulthurst",
"Andrew",
""
],
[
"Doukas",
"Jason",
""
],
[
"McDonald",
"Kristian L.",
""
]
] |
A five dimensional model containing both left-right and quark-lepton symmetries is constructed, with the gauge group broken by a combination of orbifold compactification and the Higgs mechanism. An analysis of the gauge and scalar sectors is performed and it is shown that the 5d model admits a simpler scalar sector. Bounds on the relevant symmetry breaking scales are obtained and reveal that two neutral gauge bosons may appear in the TeV energy range to be explored by the LHC. Split fermions are employed to remove the mass relations implied by the quark-lepton symmetry and the necessary fermion localisation is achieved by introducing bulk scalars with kink vacuum profiles. The symmetries of the model constrain the Yukawa sector, which in turn severely constrains the extent to which realistic split fermion scenarios may be realized in the absence of Yukawa coupling hierarchies. Nevertheless we present two interesting one generation constructs. One of these provides a rationale for $m_t>m_b, m_{\tau}$ and $m_\nu\ll m_t$ with Yukawa parameters which vary by only a factor of five. The other also suppresses the proton decay rate by spatially separating quarks and leptons but requires a Yukawa parameter hierarchy of order $10^2$.
|
0906.5324
|
Zygmunt Lalak
|
Zygmunt Lalak
|
On Gauge Mediation and Cosmological Vacuum Selection
|
Proceedings for the Rencontres de Moriond (2009 QCD session). 5
pages, no figures
| null | null | null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Gauge mediation of supersymmetry breakdown has many attractive features and
can be realized in phenomenologically interesting string-motivated models. We
point out that in models with the Polonyi-like field stabilized at a low
expectation value by quantum corrections, gravity seems to limit from above the
admixture of gravity mediation to the dominant gauge mediation channel.
However, we also point out that in a class of such models the low energy
metastable supersymmetry breaking vaccum appears to be cosmologically
disfavoured. These features should hold also in the case of typical stabilized
models with anomalous U(1) groups.
|
[
{
"created": "Mon, 29 Jun 2009 17:35:24 GMT",
"version": "v1"
}
] |
2009-06-30
|
[
[
"Lalak",
"Zygmunt",
""
]
] |
Gauge mediation of supersymmetry breakdown has many attractive features and can be realized in phenomenologically interesting string-motivated models. We point out that in models with the Polonyi-like field stabilized at a low expectation value by quantum corrections, gravity seems to limit from above the admixture of gravity mediation to the dominant gauge mediation channel. However, we also point out that in a class of such models the low energy metastable supersymmetry breaking vaccum appears to be cosmologically disfavoured. These features should hold also in the case of typical stabilized models with anomalous U(1) groups.
|
1501.04530
|
Cheuk-Yin Wong
|
Cheuk-Yin Wong, Wei-Ning Zhang, Jie Liu, Peng Ru
|
Chaoticity and Coherence in Bose-Einstein Condensation and Correlations
|
17 pages, 8 figures, invited talk presented at the Xth Workshop on
Particle Correlations and Femtoscopy (WPCF14) at Gyongyos, Hungary on August
25 to 29, 2014
| null | null | null |
hep-ph cond-mat.quant-gas nucl-th physics.atom-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We review the properties of chaoticity and coherence in Bose-Einstein
condensation and correlations, for a dense boson system in its mean-field
represented approximately by a harmonic oscillator potential. The order
parameter and the nature of the phase transition from the chaotic to the
condensate states are studied for different fixed numbers of bosons. The
two-particle correlation function in momentum space is calculated to
investigate how the Bose-Einstein correlation depends on the degree of
condensation and other momentum variables. We generalize the Bose-Einstein
correlation analysis to three-particle correlations to show its dependence on
the degree of condensation.
|
[
{
"created": "Mon, 19 Jan 2015 15:56:49 GMT",
"version": "v1"
},
{
"created": "Tue, 20 Jan 2015 19:48:36 GMT",
"version": "v2"
},
{
"created": "Fri, 23 Jan 2015 17:18:51 GMT",
"version": "v3"
}
] |
2015-01-27
|
[
[
"Wong",
"Cheuk-Yin",
""
],
[
"Zhang",
"Wei-Ning",
""
],
[
"Liu",
"Jie",
""
],
[
"Ru",
"Peng",
""
]
] |
We review the properties of chaoticity and coherence in Bose-Einstein condensation and correlations, for a dense boson system in its mean-field represented approximately by a harmonic oscillator potential. The order parameter and the nature of the phase transition from the chaotic to the condensate states are studied for different fixed numbers of bosons. The two-particle correlation function in momentum space is calculated to investigate how the Bose-Einstein correlation depends on the degree of condensation and other momentum variables. We generalize the Bose-Einstein correlation analysis to three-particle correlations to show its dependence on the degree of condensation.
|
0706.2553
|
Cl\'audio Nassif Cruz
|
Claudio Nassif, A. C. Amaro de Faria Jr. and P. R. Silva
|
Asymptotic freedom and quarks confinement treated through Thompson's
approach
|
16 pages, no figures and 34 references
| null | null | null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
In this work, we first use Thompson's renormalization group method to treat
QCD-vacuum behavior close to the regime of asymptotic freedom. QCD-vacuum
behaves effectively like a "paramagnetic system" of a classical theory in the
sense that virtual color charges (gluons) emerge in it as spin effect of a
paramagnetic material when a magnetic field aligns their microscopic magnetic
dipoles. Making a classical analogy with the paramagnetism of Landau's
theory,we are able to introduce a kind of Landau effective action without
temperature and phase transition for simply representing QCD-vacuum behavior at
higher energies as magnetization of a paramagnetic material in the presence of
a magnetic field H. This reasoning allows us to use Thompson's heuristic
approach in order to extract an "effective susceptibility" ($\chi>0$) of
QCD-vacuum. It depends on logarithmic of energy scale u to investigate hadronic
matter. Consequently,we are able to get an "effective magnetic permeability"
($\mu>1$) of such a "paramagnetic vacuum". As QCD-vacuum must obey Lorentz
invariance,the attainment of $\mu>1$ must simply require that the "effective
electrical permissivity" is $\epsilon<1$,in such a way that $\mu\epsilon=1$
(c^2=1).This leads to the antiscreening effect, where the asymptotic freedom
takes place. On the other hand, quarks cofinement, a subject which is not
treatable by perturbative calculations, is worked by the present approach. We
apply the method to study this subject in order to obtain the string constant,
which is in agreement with the experiments.
|
[
{
"created": "Mon, 18 Jun 2007 08:50:15 GMT",
"version": "v1"
},
{
"created": "Tue, 10 Jul 2007 09:08:33 GMT",
"version": "v2"
},
{
"created": "Thu, 2 Aug 2007 16:56:28 GMT",
"version": "v3"
},
{
"created": "Thu, 7 Apr 2016 01:17:17 GMT",
"version": "v4"
}
] |
2016-04-08
|
[
[
"Nassif",
"Claudio",
""
],
[
"Faria",
"A. C. Amaro de",
"Jr."
],
[
"Silva",
"P. R.",
""
]
] |
In this work, we first use Thompson's renormalization group method to treat QCD-vacuum behavior close to the regime of asymptotic freedom. QCD-vacuum behaves effectively like a "paramagnetic system" of a classical theory in the sense that virtual color charges (gluons) emerge in it as spin effect of a paramagnetic material when a magnetic field aligns their microscopic magnetic dipoles. Making a classical analogy with the paramagnetism of Landau's theory,we are able to introduce a kind of Landau effective action without temperature and phase transition for simply representing QCD-vacuum behavior at higher energies as magnetization of a paramagnetic material in the presence of a magnetic field H. This reasoning allows us to use Thompson's heuristic approach in order to extract an "effective susceptibility" ($\chi>0$) of QCD-vacuum. It depends on logarithmic of energy scale u to investigate hadronic matter. Consequently,we are able to get an "effective magnetic permeability" ($\mu>1$) of such a "paramagnetic vacuum". As QCD-vacuum must obey Lorentz invariance,the attainment of $\mu>1$ must simply require that the "effective electrical permissivity" is $\epsilon<1$,in such a way that $\mu\epsilon=1$ (c^2=1).This leads to the antiscreening effect, where the asymptotic freedom takes place. On the other hand, quarks cofinement, a subject which is not treatable by perturbative calculations, is worked by the present approach. We apply the method to study this subject in order to obtain the string constant, which is in agreement with the experiments.
|
2212.11861
|
Dian-Yong Chen
|
Jie-Lin Li, Dian-Yong Chen
|
Radiative decays of the charmed mesons in a modified relativistic quark
model
|
10 pages, 5 figures
|
Chinese Physics C46, (2022) 073106
|
10.1088/1674-1137/ac600c
| null |
hep-ph
|
http://creativecommons.org/licenses/by/4.0/
|
In the present work, we perform systematic estimations for the radiative
decays of the charmed mesons in a modified relativistic quark model. Our
estimations indicate that the branching ratios of the process of $D_2^0(1^3P_2)
\to D^{\ast 0}(1^3S_1) \gamma$, $D_3^0(1D_3) \to D_2^0(1^3P_2) \gamma$,
$D_2^0(2D_2^\prime) \to D_1^{0}(2P_1) \gamma$, $D_3^0(2^3D_3) \to D_2^0(2^3P_2)
\gamma$, and $D^{\ast 0}(1^3S_1) \to D^0(1^1S_0) \gamma$ are of the order of
$10^{-2}$, which are sizable to be detected experimentally. Moreover, the
branching ratios of some channels, for example, $D_1^0(1P_1) \to D(1^1S_0)^0
\gamma$, $D^0(3^1S_0) \to D_1^{\prime 0}(2P^\prime_{1}) \gamma$ and
$D^0(3^3S_1) \to D_2^0(2^3P_2) \gamma$ are estimated to be of the order of
$10^{-3}$, which may be accessible with the accumulation of data in future
experiments.
|
[
{
"created": "Thu, 22 Dec 2022 16:52:57 GMT",
"version": "v1"
}
] |
2022-12-23
|
[
[
"Li",
"Jie-Lin",
""
],
[
"Chen",
"Dian-Yong",
""
]
] |
In the present work, we perform systematic estimations for the radiative decays of the charmed mesons in a modified relativistic quark model. Our estimations indicate that the branching ratios of the process of $D_2^0(1^3P_2) \to D^{\ast 0}(1^3S_1) \gamma$, $D_3^0(1D_3) \to D_2^0(1^3P_2) \gamma$, $D_2^0(2D_2^\prime) \to D_1^{0}(2P_1) \gamma$, $D_3^0(2^3D_3) \to D_2^0(2^3P_2) \gamma$, and $D^{\ast 0}(1^3S_1) \to D^0(1^1S_0) \gamma$ are of the order of $10^{-2}$, which are sizable to be detected experimentally. Moreover, the branching ratios of some channels, for example, $D_1^0(1P_1) \to D(1^1S_0)^0 \gamma$, $D^0(3^1S_0) \to D_1^{\prime 0}(2P^\prime_{1}) \gamma$ and $D^0(3^3S_1) \to D_2^0(2^3P_2) \gamma$ are estimated to be of the order of $10^{-3}$, which may be accessible with the accumulation of data in future experiments.
|
hep-ph/0208040
|
Armen Oganesian
|
A.G. Oganesian (ITEP)
|
Quark distributions in polarized rho meson and its comparison with those
in pion
|
Talk presented at NATO Advanced Spin Physics Workshop, Yerevan (June
30-July3), to be published in Nato Science Series II - Physics, 16 pages,
LaTeX 2e, 4 eps figures included
| null | null | null |
hep-ph
| null |
Valence quark distributions in transversally and longitudinally polarizied
rho mesons in the region of intermediate x are obtained by generalizied QCD sum
rules. Power corrections up to d=6 are taken into account. Comparison of the
results for pi and rho mesons shows, that polarization effects are very
significant and SU(6) symmetry of distribution functions is absent. The strong
suppression of quark and gluon sea distributions in longitudinally polarizied
rho mesons is found.
|
[
{
"created": "Mon, 5 Aug 2002 13:17:15 GMT",
"version": "v1"
}
] |
2007-05-23
|
[
[
"Oganesian",
"A. G.",
"",
"ITEP"
]
] |
Valence quark distributions in transversally and longitudinally polarizied rho mesons in the region of intermediate x are obtained by generalizied QCD sum rules. Power corrections up to d=6 are taken into account. Comparison of the results for pi and rho mesons shows, that polarization effects are very significant and SU(6) symmetry of distribution functions is absent. The strong suppression of quark and gluon sea distributions in longitudinally polarizied rho mesons is found.
|
0910.2831
|
Chong Sheng Li
|
Hao Zhang, Chong Sheng Li, Qing-Hong Cao, Zhao Li
|
A Dark Matter Model with Non-Abelian Gauge Symmetry
|
25 pages, 8 figures
|
Phys.Rev.D82:075003,2010
|
10.1103/PhysRevD.82.075003
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We propose a dark matter model in which the dark sector is gauged under a new
SU(2) group. The dark sector consists of SU(2) dark gauge fields, two triplet
dark Higgs fields, and two dark fermion doublets (dark matter candidates in
this model). The dark sector interacts with the SM sector through kinetic and
mass mixing operators. The model explains both PAMELA and Fermi LAT data very
well and also satisfies constraints from both the DM relic density and Standard
Model precision observables. The phenomenology of the model at the LHC is also
explored.
|
[
{
"created": "Thu, 15 Oct 2009 10:21:15 GMT",
"version": "v1"
}
] |
2014-11-20
|
[
[
"Zhang",
"Hao",
""
],
[
"Li",
"Chong Sheng",
""
],
[
"Cao",
"Qing-Hong",
""
],
[
"Li",
"Zhao",
""
]
] |
We propose a dark matter model in which the dark sector is gauged under a new SU(2) group. The dark sector consists of SU(2) dark gauge fields, two triplet dark Higgs fields, and two dark fermion doublets (dark matter candidates in this model). The dark sector interacts with the SM sector through kinetic and mass mixing operators. The model explains both PAMELA and Fermi LAT data very well and also satisfies constraints from both the DM relic density and Standard Model precision observables. The phenomenology of the model at the LHC is also explored.
|
hep-ph/9602201
|
Jonathan Flynn
|
UKQCD Collaboration, J M Flynn and J Nieves
|
First Lattice Study of the Form Factors A_0 and A_3 in the Decay Bbar^0
to rho^+ l^- nubar_l
|
14 pages LaTeX209 with 5 figures from 11 encapsulated PostScript
files, using epsf.sty. Also available from
http://wwwhep.phys.soton.ac.uk/hepwww/papers/shep9601/
|
Nucl.Phys. B476 (1996) 313-328
|
10.1016/0550-3213(96)00307-0
|
Granada UG-DFM-3/96, Southampton SHEP 96-01
|
hep-ph
| null |
We report on a lattice calculation of the form factors A_0 and A_3 for the
pseudoscalar to vector meson semileptonic decay Bbar^0 to rho^+ l^- nubar_l. We
find that resonant (or pole-type) contributions alone are unable to describe
these two form factors simultaneously. For the quantity A_0(q^2=0), which is
important phenomenologically for the determination of |Vub|, we extract a range
of values, A_0(q^2=0) = (0.16--0.35) +0.09-0.06, where the range is due to
systematic uncertainty and the quoted error is statistical. We have also
determined A_2(q^2=0) = 0.28 +0.09-0.06 +0.04-0.05.
|
[
{
"created": "Thu, 1 Feb 1996 09:42:06 GMT",
"version": "v1"
}
] |
2015-06-25
|
[
[
"UKQCD Collaboration",
"",
""
],
[
"Flynn",
"J M",
""
],
[
"Nieves",
"J",
""
]
] |
We report on a lattice calculation of the form factors A_0 and A_3 for the pseudoscalar to vector meson semileptonic decay Bbar^0 to rho^+ l^- nubar_l. We find that resonant (or pole-type) contributions alone are unable to describe these two form factors simultaneously. For the quantity A_0(q^2=0), which is important phenomenologically for the determination of |Vub|, we extract a range of values, A_0(q^2=0) = (0.16--0.35) +0.09-0.06, where the range is due to systematic uncertainty and the quoted error is statistical. We have also determined A_2(q^2=0) = 0.28 +0.09-0.06 +0.04-0.05.
|
1502.03767
|
Hendrik van Hees
|
H. van Hees, J. Weil, S. Endres, M. Bleicher
|
Electromagnetic probes in heavy-ion collisions: Messengers from the hot
and dense phase
|
8 pages, 2 figures; Contribution to the proceedings of the Resonance
Workshop at Catania 2014
|
EPJ Web of Conferences 97, 00028 (2015)
|
10.1051/epjconf/20159700028
| null |
hep-ph nucl-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Due to their penetrating nature, electromagnetic probes, i.e.,
lepton-antilepton pairs (dileptons) and photons are unique tools to gain
insight into the nature of the hot and dense medium of strongly-interacting
particles created in relativistic heavy-ion collisions, including hints to the
nature of the restoration of chiral symmetry of QCD. Of particular interest are
the spectral properties of the electromagnetic current-correlation function of
these particles within the dense and/or hot medium. The related theoretical
investigations of the in-medium properties of the involved particles in both
the partonic and hadronic part of the QCD phase diagram underline the
importance of a proper understanding of the properties of various hadron
resonances in the medium.
|
[
{
"created": "Thu, 12 Feb 2015 18:46:25 GMT",
"version": "v1"
}
] |
2015-06-23
|
[
[
"van Hees",
"H.",
""
],
[
"Weil",
"J.",
""
],
[
"Endres",
"S.",
""
],
[
"Bleicher",
"M.",
""
]
] |
Due to their penetrating nature, electromagnetic probes, i.e., lepton-antilepton pairs (dileptons) and photons are unique tools to gain insight into the nature of the hot and dense medium of strongly-interacting particles created in relativistic heavy-ion collisions, including hints to the nature of the restoration of chiral symmetry of QCD. Of particular interest are the spectral properties of the electromagnetic current-correlation function of these particles within the dense and/or hot medium. The related theoretical investigations of the in-medium properties of the involved particles in both the partonic and hadronic part of the QCD phase diagram underline the importance of a proper understanding of the properties of various hadron resonances in the medium.
|
2003.06219
|
Jose Ramon Espinosa
|
J.R. Espinosa
|
Vacuum Decay in the Standard Model: Analytical Results with Running and
Gravity
|
30 pages, 4 figures
| null |
10.1088/1475-7516/2020/06/052
|
IFT-UAm/CSIC-20-42
|
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
A tunneling bounce driving the decay of a metastable vacuum must respect an
integral constraint dictated by simple scaling arguments that is very useful to
determine key properties of the bounce. After illustrating how this works in a
simple toy model, the Standard Model Higgs potential is considered, including
quartic coupling running and gravitational corrections as sources of scale
invariance breaking. This approach clarifies the existence of the bounce and
leads to simple and accurate analytical results in an expansion in the breaking
parameters. Using the so-called tunneling-potential approach (generalized for
nonminimal coupling to gravity) the integral constraint and the tunneling
action are extended to second order in perturbations.
|
[
{
"created": "Fri, 13 Mar 2020 12:18:21 GMT",
"version": "v1"
}
] |
2020-07-01
|
[
[
"Espinosa",
"J. R.",
""
]
] |
A tunneling bounce driving the decay of a metastable vacuum must respect an integral constraint dictated by simple scaling arguments that is very useful to determine key properties of the bounce. After illustrating how this works in a simple toy model, the Standard Model Higgs potential is considered, including quartic coupling running and gravitational corrections as sources of scale invariance breaking. This approach clarifies the existence of the bounce and leads to simple and accurate analytical results in an expansion in the breaking parameters. Using the so-called tunneling-potential approach (generalized for nonminimal coupling to gravity) the integral constraint and the tunneling action are extended to second order in perturbations.
|
hep-ph/0001049
|
Guenter Sigl
|
Guenter Sigl (DARC, Meudon, France)
|
Cosmic rays and neutrino interactions beyond the standard model
|
3 latex pages, 1 postscript figure included, to appear in the TAUP 99
Proceedings, Nucl. Phys. B (Proc. Suppl.), ed. by M. Froissart, J. Dumarchez
and D. Vignaud
|
Nucl.Phys.Proc.Suppl. 87 (2000) 439-441
|
10.1016/S0920-5632(00)00716-7
| null |
hep-ph astro-ph
| null |
Some solutions of the hierarchy problem of particle physics can lead to
significantly increased neutrino cross sections beyond the electroweak scale.
We discuss some consequences for and constraints resulting from cosmic ray
physics.
|
[
{
"created": "Thu, 6 Jan 2000 15:49:11 GMT",
"version": "v1"
}
] |
2009-10-31
|
[
[
"Sigl",
"Guenter",
"",
"DARC, Meudon, France"
]
] |
Some solutions of the hierarchy problem of particle physics can lead to significantly increased neutrino cross sections beyond the electroweak scale. We discuss some consequences for and constraints resulting from cosmic ray physics.
|
hep-ph/0305101
|
Michael Spira
|
Jaume Guasch, Petra H\"afliger, Michael Spira
|
MSSM Higgs Decays to Bottom Quark Pairs revisited
|
16 pages, latex, 6 figures, some clarifications added and Figs. 5a,6a
replaced, conclusions unchanged, version to be published
|
Phys.Rev. D68 (2003) 115001
|
10.1103/PhysRevD.68.115001
|
PSI-PR-03-06
|
hep-ph
| null |
We present an update of neutral Higgs boson decays into bottom quark pairs in
the minimal supersymmetric extension of the Standard Model. In particular the
resummation of potentially large higher-order corrections due to the soft SUSY
breaking parameters A_b and mu is extended. The remaining theoretical
uncertainties due to unknown higher-order SUSY-QCD corrections are analyzed
quantitatively.
|
[
{
"created": "Fri, 9 May 2003 12:16:32 GMT",
"version": "v1"
},
{
"created": "Thu, 2 Oct 2003 17:59:35 GMT",
"version": "v2"
}
] |
2009-11-10
|
[
[
"Guasch",
"Jaume",
""
],
[
"Häfliger",
"Petra",
""
],
[
"Spira",
"Michael",
""
]
] |
We present an update of neutral Higgs boson decays into bottom quark pairs in the minimal supersymmetric extension of the Standard Model. In particular the resummation of potentially large higher-order corrections due to the soft SUSY breaking parameters A_b and mu is extended. The remaining theoretical uncertainties due to unknown higher-order SUSY-QCD corrections are analyzed quantitatively.
|
1108.0250
|
Harleen Dahiya Dr.
|
Harleen Dahiya and Neetika Sharma
|
Electromagnetic form factors of the nucleon in the chiral constituent
quark model
|
4 pages. Prepared for the XIX International Workshop on
Deep-Inelastic Scattering and Related Subjects DIS 2011, April 11-15, 2011,
Newport News, Virginia, USA
| null | null | null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
The electromagnetic form factors have attracted lot of theoretical and
experimental attention recently as they encode extensive information on the
internal structure of the hadron. An understanding of the form factors is
necessary to describe the strong interactions as they are sensitive to the pion
cloud and provide a test for the QCD inspired effective field theories based on
the chiral symmetry. In view of the very exciting recent developments in the
field, we propose to apply the techniques of chiral constituent quark model to
measure the electromagnetic form factors of the nucleon.The results obtained
are comparable to the latest experimental studies and also show improvement
over some theoretical interpretations.
|
[
{
"created": "Mon, 1 Aug 2011 06:51:26 GMT",
"version": "v1"
}
] |
2011-08-02
|
[
[
"Dahiya",
"Harleen",
""
],
[
"Sharma",
"Neetika",
""
]
] |
The electromagnetic form factors have attracted lot of theoretical and experimental attention recently as they encode extensive information on the internal structure of the hadron. An understanding of the form factors is necessary to describe the strong interactions as they are sensitive to the pion cloud and provide a test for the QCD inspired effective field theories based on the chiral symmetry. In view of the very exciting recent developments in the field, we propose to apply the techniques of chiral constituent quark model to measure the electromagnetic form factors of the nucleon.The results obtained are comparable to the latest experimental studies and also show improvement over some theoretical interpretations.
|
2407.20586
|
Zhen-Hua Zhang
|
Jing-Juan Qi, Zhen-Hua Zhang
|
$C\!P$ asymmetries corresponding to the imaginary parts of the
interference terms in cascade decays of heavy hadrons
|
9 pages
| null | null | null |
hep-ph
|
http://creativecommons.org/licenses/by/4.0/
|
A mechanism of generating CP violation through the imaginary part of the
interference of two amplitudes is proposed. This mechanism has shown clear
evidence in decays such as $B^\pm\to \pi^\pm\pi^+\pi^-$. The proposed mechanism
is helpful in searching for CP violation in bottom and charmed baryon decay
processes.
|
[
{
"created": "Tue, 30 Jul 2024 06:47:23 GMT",
"version": "v1"
}
] |
2024-07-31
|
[
[
"Qi",
"Jing-Juan",
""
],
[
"Zhang",
"Zhen-Hua",
""
]
] |
A mechanism of generating CP violation through the imaginary part of the interference of two amplitudes is proposed. This mechanism has shown clear evidence in decays such as $B^\pm\to \pi^\pm\pi^+\pi^-$. The proposed mechanism is helpful in searching for CP violation in bottom and charmed baryon decay processes.
|
hep-ph/0502034
|
Cai-Dian Lu
|
Bi-Hai Hong and Cai-Dian Lu
|
Determining the CP Violation Angle $\gamma$ in $B_s$ Decays without
Hadronic Uncertainty
|
4 pages, including 2 figures, Revtex
|
Phys.Rev. D71 (2005) 117301
|
10.1103/PhysRevD.71.117301
| null |
hep-ph hep-ex
| null |
We study the rare decays $B_s^0\to D^\pm \pi^\mp$ and $\bar B_s^0\to D^\mp
\pi^\pm$, which can occur only via annihilation type $W$ exchange diagrams in
the standard model. The time-dependent decay rates of the four channels can
provide four CP parameters, which are experimentally measurable. We show that
the CKM angle $\phi_3=\gamma$ can be determined from these parameters without
any theoretical model dependence. These channels can be measured in future LHCb
experiments to provide a clean way for $\gamma$ measurement.
|
[
{
"created": "Thu, 3 Feb 2005 15:08:25 GMT",
"version": "v1"
},
{
"created": "Thu, 28 Apr 2005 00:38:29 GMT",
"version": "v2"
},
{
"created": "Mon, 30 May 2005 01:26:05 GMT",
"version": "v3"
}
] |
2007-05-23
|
[
[
"Hong",
"Bi-Hai",
""
],
[
"Lu",
"Cai-Dian",
""
]
] |
We study the rare decays $B_s^0\to D^\pm \pi^\mp$ and $\bar B_s^0\to D^\mp \pi^\pm$, which can occur only via annihilation type $W$ exchange diagrams in the standard model. The time-dependent decay rates of the four channels can provide four CP parameters, which are experimentally measurable. We show that the CKM angle $\phi_3=\gamma$ can be determined from these parameters without any theoretical model dependence. These channels can be measured in future LHCb experiments to provide a clean way for $\gamma$ measurement.
|
0711.1687
|
Joshua Sayre
|
J. Sayre, S. Wiesenfeldt
|
Naturalness and the Neutrino Matrix
|
Discussion about neutrinoless double beta decay expanded; typos
corrected; references added and updated
|
Phys.Rev.D77:053005,2008
|
10.1103/PhysRevD.77.053005
|
TTP07-33, SFB/CPP-07-79
|
hep-ph
| null |
The observed pattern of neutrino mass splittings and mixing angles indicates
that their family structure is significantly different from that of the charged
fermions. We investigate the implications of these data for the fermion mass
matrices in grand unified theories with a type-I seesaw mechanism. We show
that, with simple assumptions, naturalness leads to a strongly hierarchical
Majorana mass matrix for heavy right-handed neutrinos and a partially cascade
form for the Dirac neutrino matrix. We consider various model building
scenarios which could alter this conclusion, and discuss their consequences for
the construction of a natural model. We find that including partially lopsided
matrices can aid us in generating a satisfying model.
|
[
{
"created": "Mon, 12 Nov 2007 20:33:32 GMT",
"version": "v1"
},
{
"created": "Fri, 4 Apr 2008 16:33:08 GMT",
"version": "v2"
}
] |
2008-11-26
|
[
[
"Sayre",
"J.",
""
],
[
"Wiesenfeldt",
"S.",
""
]
] |
The observed pattern of neutrino mass splittings and mixing angles indicates that their family structure is significantly different from that of the charged fermions. We investigate the implications of these data for the fermion mass matrices in grand unified theories with a type-I seesaw mechanism. We show that, with simple assumptions, naturalness leads to a strongly hierarchical Majorana mass matrix for heavy right-handed neutrinos and a partially cascade form for the Dirac neutrino matrix. We consider various model building scenarios which could alter this conclusion, and discuss their consequences for the construction of a natural model. We find that including partially lopsided matrices can aid us in generating a satisfying model.
|
0804.4119
|
Alfredo Valcarce
|
M.T. Fernandez-Carames, P. Gonzalez, A. Valcarce
|
$\pi B_{8}B_{8}$ and $\sigma B_{8}B_{8}$ couplings from a chiral quark
potential model
|
21 pages, 4 figures, 3 tables
|
Phys.Rev.C77:054003,2008
|
10.1103/PhysRevC.77.054003
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
From an SU(2)$\otimes $SU(2) chiral quark potential model incorporating
spontaneous chiral symmetry breaking the asymptotic $\pi $ and $\sigma $
exchange pieces of the $NN$ potential are generated. From them the $\pi NN$ and
$\sigma NN$ coupling constants can be extracted. The generalization to
SU(3)$\otimes $SU(3) allows for a determination of $\pi B_{8}B_{8}$ and $%
\sigma B_{8}B_{8}$ coupling constants according to exact SU(3) hadron symmetry.
The implementation of the values of the couplings at $Q^{2}=0$ provided by QCD
sum rules and/or phenomenology makes also feasible the extraction of the
meson-baryon-baryon form factors. In this manner a quite complete knowledge of
the couplings may be attained.
|
[
{
"created": "Fri, 25 Apr 2008 14:36:47 GMT",
"version": "v1"
}
] |
2008-11-26
|
[
[
"Fernandez-Carames",
"M. T.",
""
],
[
"Gonzalez",
"P.",
""
],
[
"Valcarce",
"A.",
""
]
] |
From an SU(2)$\otimes $SU(2) chiral quark potential model incorporating spontaneous chiral symmetry breaking the asymptotic $\pi $ and $\sigma $ exchange pieces of the $NN$ potential are generated. From them the $\pi NN$ and $\sigma NN$ coupling constants can be extracted. The generalization to SU(3)$\otimes $SU(3) allows for a determination of $\pi B_{8}B_{8}$ and $% \sigma B_{8}B_{8}$ coupling constants according to exact SU(3) hadron symmetry. The implementation of the values of the couplings at $Q^{2}=0$ provided by QCD sum rules and/or phenomenology makes also feasible the extraction of the meson-baryon-baryon form factors. In this manner a quite complete knowledge of the couplings may be attained.
|
1507.00047
|
Einan Gardi
|
{\O}yvind Almelid, Claude Duhr, Einan Gardi
|
Three-loop corrections to the soft anomalous dimension in multi-leg
scattering
|
v2: remaining diagrams computed; colour conservation accounted for;
strict collinear factorization shown to hold. Some references added. 6 pages,
2 figures
|
Phys. Rev. Lett. 117, 172002 (2016)
|
10.1103/PhysRevLett.117.172002
|
CERN-PH-TH-2015-148, CP3-15-18, Edinburgh 2015/08, LPN15-026
|
hep-ph hep-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We present the three-loop result for the soft anomalous dimension governing
long-distance singularities of multi-leg gauge-theory scattering amplitudes of
massless partons. We compute all contributing webs involving semi-infinite
Wilson lines at three loops and obtain the complete three-loop correction to
the dipole formula. We find that non-dipole corrections appear already for
three coloured partons, where the correction is a constant without kinematic
dependence. Kinematic dependence appears only through conformally-invariant
cross ratios for four coloured partons or more, and the result can be expressed
in terms of single-valued harmonic polylogarithms of weight five. While the
non-dipole three-loop term does not vanish in two-particle collinear limits,
its contribution to the splitting amplitude anomalous dimension reduces to a
constant, and it only depends on the colour charges of the collinear pair,
thereby preserving strict collinear factorization properties. Finally we verify
that our result is consistent with expectations from the Regge limit.
|
[
{
"created": "Tue, 30 Jun 2015 21:49:28 GMT",
"version": "v1"
},
{
"created": "Mon, 23 May 2016 19:25:20 GMT",
"version": "v2"
}
] |
2016-10-26
|
[
[
"Almelid",
"Øyvind",
""
],
[
"Duhr",
"Claude",
""
],
[
"Gardi",
"Einan",
""
]
] |
We present the three-loop result for the soft anomalous dimension governing long-distance singularities of multi-leg gauge-theory scattering amplitudes of massless partons. We compute all contributing webs involving semi-infinite Wilson lines at three loops and obtain the complete three-loop correction to the dipole formula. We find that non-dipole corrections appear already for three coloured partons, where the correction is a constant without kinematic dependence. Kinematic dependence appears only through conformally-invariant cross ratios for four coloured partons or more, and the result can be expressed in terms of single-valued harmonic polylogarithms of weight five. While the non-dipole three-loop term does not vanish in two-particle collinear limits, its contribution to the splitting amplitude anomalous dimension reduces to a constant, and it only depends on the colour charges of the collinear pair, thereby preserving strict collinear factorization properties. Finally we verify that our result is consistent with expectations from the Regge limit.
|
2107.08201
|
Ryo Nagai
|
Stefania De Curtis, Stefano Moretti, Ryo Nagai, and Kei Yagyu
|
CP-Violation in a Composite 2-Higgs Doublet Model
|
23 pages, 5 figures
| null | null |
OU-HET-1097
|
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We study CP-Violation (CPV) in a Composite 2-Higgs Doublet Model (C2HDM)
based on the global symmetry breaking $SO(6)/[SO(4)\times SO(2)]$, wherein the
strong sector is modeled by a two-site moose structure. Non-trivial complex
phases in the interactions involving fermions in both the elementary and strong
sectors can induce CPV in the Higgs potential as well as the Yukawa coupling
parameters. We compute both of the latter and analyse their dependence upon the
aforementioned complex phases. Finally, we discuss physics observables which
are distinctive of this model. Even in the simplest case with only one complex
phase in the strong sector we can get significant CPV effects.
|
[
{
"created": "Sat, 17 Jul 2021 08:04:51 GMT",
"version": "v1"
}
] |
2021-07-20
|
[
[
"De Curtis",
"Stefania",
""
],
[
"Moretti",
"Stefano",
""
],
[
"Nagai",
"Ryo",
""
],
[
"Yagyu",
"Kei",
""
]
] |
We study CP-Violation (CPV) in a Composite 2-Higgs Doublet Model (C2HDM) based on the global symmetry breaking $SO(6)/[SO(4)\times SO(2)]$, wherein the strong sector is modeled by a two-site moose structure. Non-trivial complex phases in the interactions involving fermions in both the elementary and strong sectors can induce CPV in the Higgs potential as well as the Yukawa coupling parameters. We compute both of the latter and analyse their dependence upon the aforementioned complex phases. Finally, we discuss physics observables which are distinctive of this model. Even in the simplest case with only one complex phase in the strong sector we can get significant CPV effects.
|
1909.03053
|
Wei Zhu
|
Wei Zhu
|
Improved Bethe-Heitler formula
|
35 pages, 8 figures. A reviwed version and the title is changed.
Accepted for publication on NPB
|
NPB 953 (2020) 114958
|
10.1016/j.nuclphysb.2020.114958
| null |
hep-ph astro-ph.HE
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
The Bethe-Heitler formula describes bremsstrahlung and it's a typical and
important example in quantum electromagnetic dynamics (QED). This formula is
widely applied in many branches of physics and astrophysics. We find that the
integrated bremsstrahlung cross section at the static approximation and high
energy limit has an unexpected big increment, which is missed by previous
bremsstrahlung theory. This anomalous effect also exists in electron-positron
pair creation. We derive the relating formulas and point out that
electromagnetic cascades at the top of atmosphere can test this effect.
|
[
{
"created": "Fri, 6 Sep 2019 09:37:07 GMT",
"version": "v1"
},
{
"created": "Tue, 11 Feb 2020 22:29:20 GMT",
"version": "v2"
}
] |
2020-02-26
|
[
[
"Zhu",
"Wei",
""
]
] |
The Bethe-Heitler formula describes bremsstrahlung and it's a typical and important example in quantum electromagnetic dynamics (QED). This formula is widely applied in many branches of physics and astrophysics. We find that the integrated bremsstrahlung cross section at the static approximation and high energy limit has an unexpected big increment, which is missed by previous bremsstrahlung theory. This anomalous effect also exists in electron-positron pair creation. We derive the relating formulas and point out that electromagnetic cascades at the top of atmosphere can test this effect.
|
1212.1893
|
Yao De-Liang
|
Yun-Hua Chen, De-Liang Yao, H. Q. Zheng
|
Analyses of pion-nucleon elastic scattering amplitudes up to $O(p^4)$ in
extended-on-mass-shell subtraction scheme
|
The final version published in Phys.Rev. D 87, 054019 (2013)
| null |
10.1103/PhysRevD.87.054019
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We extend the analysis of elastic pion-nucleon scattering up to $O(p^4)$
level using extended-on-mass-shell subtraction scheme within the framework of
covariant baryon chiral perturbation theory. Numerical fits to partial wave
phase shift data up to $\sqrt{s}=1.13$ GeV are performed to pin down the free
low energy constants. A good description to the existing phase shift data is
achieved. We find a good convergence for the chiral series at $O(p^4)$,
considerably improved with respect to the $O(p^3)$-level analyses found in
previous literature. Also, the leading order contribution from explicit
$\Delta(1232)$ resonance and partially-included $\Delta(1232)$ loop
contribution are included to describe phase shift data up to $\sqrt{s}=1.20$
GeV. As phenomenological applications, we investigate chiral correction to the
Goldberger-Treiman relation %$\Delta_{GT}$ and find that it converges rapidly,
and the $O(p^3)$ correction is found to be very small: $\simeq 0.2%$. We also
get a reasonable prediction of pion-nucleon sigma term $\sigma_{\pi N}$ up to
$O(p^4)$ by performing fits including both the pion-nucleon partial wave phase
shift data and the lattice QCD data. We report that $\sigma_{\pi N}=52\pm7$ MeV
from the fit without $\Delta(1232)$, and $\sigma_{\pi N}=45\pm6$ MeV from the
fit with explicit $\Delta(1232)$.
|
[
{
"created": "Sun, 9 Dec 2012 14:43:47 GMT",
"version": "v1"
},
{
"created": "Mon, 25 Feb 2013 07:55:12 GMT",
"version": "v2"
},
{
"created": "Sat, 20 Apr 2013 14:31:21 GMT",
"version": "v3"
}
] |
2013-04-23
|
[
[
"Chen",
"Yun-Hua",
""
],
[
"Yao",
"De-Liang",
""
],
[
"Zheng",
"H. Q.",
""
]
] |
We extend the analysis of elastic pion-nucleon scattering up to $O(p^4)$ level using extended-on-mass-shell subtraction scheme within the framework of covariant baryon chiral perturbation theory. Numerical fits to partial wave phase shift data up to $\sqrt{s}=1.13$ GeV are performed to pin down the free low energy constants. A good description to the existing phase shift data is achieved. We find a good convergence for the chiral series at $O(p^4)$, considerably improved with respect to the $O(p^3)$-level analyses found in previous literature. Also, the leading order contribution from explicit $\Delta(1232)$ resonance and partially-included $\Delta(1232)$ loop contribution are included to describe phase shift data up to $\sqrt{s}=1.20$ GeV. As phenomenological applications, we investigate chiral correction to the Goldberger-Treiman relation %$\Delta_{GT}$ and find that it converges rapidly, and the $O(p^3)$ correction is found to be very small: $\simeq 0.2%$. We also get a reasonable prediction of pion-nucleon sigma term $\sigma_{\pi N}$ up to $O(p^4)$ by performing fits including both the pion-nucleon partial wave phase shift data and the lattice QCD data. We report that $\sigma_{\pi N}=52\pm7$ MeV from the fit without $\Delta(1232)$, and $\sigma_{\pi N}=45\pm6$ MeV from the fit with explicit $\Delta(1232)$.
|
0909.5529
|
Graeme Watt
|
A.D. Martin, M.G. Ryskin, G. Watt
|
NLO prescription for unintegrated parton distributions
|
20 pages, 8 figures. v2: version to appear in Eur. Phys. J. C
|
Eur.Phys.J.C66:163-172,2010
|
10.1140/epjc/s10052-010-1242-5
|
IPPP/09/78, DCPT/09/156
|
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We show how parton distributions unintegrated over the parton transverse
momentum, k_t, may be generated, at NLO accuracy, from the known integrated
(DGLAP-evolved) parton densities determined from global data analyses. A few
numerical examples are given, which demonstrate that sufficient accuracy is
obtained by keeping only the LO splitting functions together with the NLO
integrated parton densities. However, it is important to keep the precise
kinematics of the process, by taking the scale to be the virtuality rather than
the transverse momentum, in order to be consistent with the calculation of the
NLO splitting functions.
|
[
{
"created": "Wed, 30 Sep 2009 07:15:03 GMT",
"version": "v1"
},
{
"created": "Wed, 6 Jan 2010 09:40:05 GMT",
"version": "v2"
}
] |
2010-03-19
|
[
[
"Martin",
"A. D.",
""
],
[
"Ryskin",
"M. G.",
""
],
[
"Watt",
"G.",
""
]
] |
We show how parton distributions unintegrated over the parton transverse momentum, k_t, may be generated, at NLO accuracy, from the known integrated (DGLAP-evolved) parton densities determined from global data analyses. A few numerical examples are given, which demonstrate that sufficient accuracy is obtained by keeping only the LO splitting functions together with the NLO integrated parton densities. However, it is important to keep the precise kinematics of the process, by taking the scale to be the virtuality rather than the transverse momentum, in order to be consistent with the calculation of the NLO splitting functions.
|
2405.00094
|
Jaime Hoefken Zink
|
Patrick Foldenauer, Jaime Hoefken Zink
|
How to rule out $(g-2)_\mu$ in $U(1)_{L_\mu-L_\tau}$ with White Dwarf
Cooling
|
17 pages, 6 figures, 2 data files; v2: improved discussion of the
cooling limit, matches journal version to appear in JHEP
| null | null |
IFT-UAM/CSIC-24-66
|
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
In recent years, the gauge group $U(1)_{L_\mu-L_\tau}$ has received a lot of
attention since it can, in principle, account for the observed excess in the
anomalous muon magnetic moment $(g-2)_\mu$, as well as the Hubble tension. Due
to unavoidable, loop-induced kinetic mixing with the SM photon and $Z$, the
$U(1)_{L_\mu-L_\tau}$ gauge boson $A'$ can contribute to stellar cooling via
decays into neutrinos. In this work, we perform for the first time an
\textit{ab initio} computation of the neutrino emissivities of white dwarf
stars due to plasmon decay in a model of gauged $U(1)_{L_\mu-L_\tau}$. A key
result is that current observations of the early-stage white dwarf neutrino
luminosity at the 30\% level exclude previously allowed regions of the
parameter space favoured by a simultaneous explanation of the $(g-2)_\mu$ and
$H_0$ anomalies. In this work, we present the relevant white dwarf cooling
limits over the entire $A'$ mass range. In particular, we have performed a
rigorous computation of the luminosities in the resonant regime, where the $A'$
mass is comparable to the white dwarf plasma frequencies.
|
[
{
"created": "Tue, 30 Apr 2024 18:00:01 GMT",
"version": "v1"
},
{
"created": "Thu, 20 Jun 2024 16:30:46 GMT",
"version": "v2"
}
] |
2024-06-21
|
[
[
"Foldenauer",
"Patrick",
""
],
[
"Zink",
"Jaime Hoefken",
""
]
] |
In recent years, the gauge group $U(1)_{L_\mu-L_\tau}$ has received a lot of attention since it can, in principle, account for the observed excess in the anomalous muon magnetic moment $(g-2)_\mu$, as well as the Hubble tension. Due to unavoidable, loop-induced kinetic mixing with the SM photon and $Z$, the $U(1)_{L_\mu-L_\tau}$ gauge boson $A'$ can contribute to stellar cooling via decays into neutrinos. In this work, we perform for the first time an \textit{ab initio} computation of the neutrino emissivities of white dwarf stars due to plasmon decay in a model of gauged $U(1)_{L_\mu-L_\tau}$. A key result is that current observations of the early-stage white dwarf neutrino luminosity at the 30\% level exclude previously allowed regions of the parameter space favoured by a simultaneous explanation of the $(g-2)_\mu$ and $H_0$ anomalies. In this work, we present the relevant white dwarf cooling limits over the entire $A'$ mass range. In particular, we have performed a rigorous computation of the luminosities in the resonant regime, where the $A'$ mass is comparable to the white dwarf plasma frequencies.
|
1705.00225
|
Tania Robens
|
Agnieszka Ilnicka, Maria Krawczyk, Tania Robens, Dorota Sokolowska
|
IDM and not only
|
12 pages, 7 figures; Contribution to Corfu Summer Institute 2016
"School and Workshops on Elementary Particle Physics and Gravity", 31 August
- 23 September, 2016, Corfu, Greece
| null | null | null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
In this note, we discuss recent updates to a previous scan for the Inert
Doublet Model, a two Higgs doublet model with a dark matter candidate. We
explicitly show the inclusion of updated constraints on direct detection
reduces the allowed parameter space significantly. We furthermore discuss the
IDMS - an extension of the IDM with a complex singlet.
|
[
{
"created": "Sat, 29 Apr 2017 18:33:19 GMT",
"version": "v1"
}
] |
2017-05-02
|
[
[
"Ilnicka",
"Agnieszka",
""
],
[
"Krawczyk",
"Maria",
""
],
[
"Robens",
"Tania",
""
],
[
"Sokolowska",
"Dorota",
""
]
] |
In this note, we discuss recent updates to a previous scan for the Inert Doublet Model, a two Higgs doublet model with a dark matter candidate. We explicitly show the inclusion of updated constraints on direct detection reduces the allowed parameter space significantly. We furthermore discuss the IDMS - an extension of the IDM with a complex singlet.
|
1706.05910
|
Andrey Grozin
|
Andrey G. Grozin, Thomas Mannel, and Alexei A. Pivovarov
|
Towards a Next-to-Next-to-Leading Order analysis of matching in
$B^0$-$\bar{B}^0$ mixing
|
17 pages, 4 figures; v2: 3 refs added, corresponds to the published
version
|
Phys. Rev. D 96, 074032 (2017)
|
10.1103/PhysRevD.96.074032
|
QFET-2017-10
|
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We compute perturbative corrections to matching coefficients of QCD to HQET
for the matrix element of the $\Delta B=2$ operator that determines the mass
difference in $B^0-\bar{B}^0$ system of states. This involves the technical
point of choosing the operator basis in HQET, separating physical operators
from evanescent ones. We obtain an analytical result for some of the two-loop
corrections at order $\alpha_s^2$.
|
[
{
"created": "Mon, 19 Jun 2017 13:02:52 GMT",
"version": "v1"
},
{
"created": "Fri, 27 Oct 2017 10:55:25 GMT",
"version": "v2"
}
] |
2017-11-08
|
[
[
"Grozin",
"Andrey G.",
""
],
[
"Mannel",
"Thomas",
""
],
[
"Pivovarov",
"Alexei A.",
""
]
] |
We compute perturbative corrections to matching coefficients of QCD to HQET for the matrix element of the $\Delta B=2$ operator that determines the mass difference in $B^0-\bar{B}^0$ system of states. This involves the technical point of choosing the operator basis in HQET, separating physical operators from evanescent ones. We obtain an analytical result for some of the two-loop corrections at order $\alpha_s^2$.
|
1407.7465
|
Kyohei Mukaida
|
Takeo Moroi, Kyohei Mukaida, Kazunori Nakayama, Masahiro Takimoto
|
Axion Models with High Scale Inflation
|
18 pages, 4 figures
| null |
10.1007/JHEP11(2014)151
|
UT-14-31
|
hep-ph astro-ph.CO
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We revisit the cosmological aspects of axion models. In the high-scale
inflation scenario, the Peccei-Quinn (PQ) symmetry is likely to be restored
during/after inflation. If the curvature of the PQ scalar potential at the
origin is smaller than its vacuum expectation value; for instance in a class of
SUSY axion models, thermal inflation happens before the radial component of the
PQ scalar (saxion) relaxes into the global minimum of the potential and the
decay of saxion coherent oscillation would produce too much axion dark
radiation. In this paper, we study how to avoid the overproduction of axion
dark radiation with some concrete examples. We show that, by taking account of
the finite-temperature dissipation effect appropriately, the overproduction
constraint can be relaxed since the PQ scalar can take part in the thermal
plasma again even after the PQ phase transition. We also show that it can be
further relaxed owing to the late time decay of another heavy CP-odd scalar, if
it is present.
|
[
{
"created": "Mon, 28 Jul 2014 16:24:02 GMT",
"version": "v1"
}
] |
2015-06-22
|
[
[
"Moroi",
"Takeo",
""
],
[
"Mukaida",
"Kyohei",
""
],
[
"Nakayama",
"Kazunori",
""
],
[
"Takimoto",
"Masahiro",
""
]
] |
We revisit the cosmological aspects of axion models. In the high-scale inflation scenario, the Peccei-Quinn (PQ) symmetry is likely to be restored during/after inflation. If the curvature of the PQ scalar potential at the origin is smaller than its vacuum expectation value; for instance in a class of SUSY axion models, thermal inflation happens before the radial component of the PQ scalar (saxion) relaxes into the global minimum of the potential and the decay of saxion coherent oscillation would produce too much axion dark radiation. In this paper, we study how to avoid the overproduction of axion dark radiation with some concrete examples. We show that, by taking account of the finite-temperature dissipation effect appropriately, the overproduction constraint can be relaxed since the PQ scalar can take part in the thermal plasma again even after the PQ phase transition. We also show that it can be further relaxed owing to the late time decay of another heavy CP-odd scalar, if it is present.
|
0911.0438
|
Francisco Campanario
|
G.Bozzi, F.Campanario, V.Hankele and D.Zeppenfeld
|
NLO QCD corrections to W+W- gamma and Z Z gamma production with leptonic
decays
| null |
Phys.Rev.D81:094030,2010
|
10.1103/PhysRevD.81.094030
|
KA-TP-11-2009, SFB/CPP-09-105,FTUV-09-1101,IFUM-938-FT
|
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
The computation of the NLO QCD corrections to the cross sections for W+W-
gamma and ZZgamma production in hadronic collisions is presented. We consider
the case of a real photon in the final state, but include full leptonic decays
of the W and Z bosons. Numerical results for the LHC and the Tevatron are
obtained through a fully flexible parton level Monte Carlo based on the
structure of the VBFNLO program, allowing an easy implementation of arbitrary
cuts and distributions. We show the dependence on scale variations of the
integrated cross sections and provide evidence that NLO QCD corrections
strongly modify the LO predictions for observables at the LHC both in magnitude
and in shape.
|
[
{
"created": "Tue, 3 Nov 2009 14:31:13 GMT",
"version": "v1"
}
] |
2014-11-20
|
[
[
"Bozzi",
"G.",
""
],
[
"Campanario",
"F.",
""
],
[
"Hankele",
"V.",
""
],
[
"Zeppenfeld",
"D.",
""
]
] |
The computation of the NLO QCD corrections to the cross sections for W+W- gamma and ZZgamma production in hadronic collisions is presented. We consider the case of a real photon in the final state, but include full leptonic decays of the W and Z bosons. Numerical results for the LHC and the Tevatron are obtained through a fully flexible parton level Monte Carlo based on the structure of the VBFNLO program, allowing an easy implementation of arbitrary cuts and distributions. We show the dependence on scale variations of the integrated cross sections and provide evidence that NLO QCD corrections strongly modify the LO predictions for observables at the LHC both in magnitude and in shape.
|
hep-ph/0601138
|
Rikard Enberg
|
R. Enberg, B. Pire, L. Szymanowski
|
Transversity GPD in photo- and electroproduction of two vector mesons
|
15 pages, 9 figures. Extended discussion of experimental prospects in
the conclusions. Version to appear in EPJ C
|
Eur.Phys.J.C47:87-94,2006
|
10.1140/epjc/s2006-02545-3
|
CPHT-RR005.0106, LBNL-59084
|
hep-ph
| null |
The chiral-odd generalized parton distribution (GPD), or transversity GPD, of
the nucleon can be accessed experimentally through the photo- or
electroproduction of two vector mesons on a polarized nucleon target,
\gamma^(*) N --> \rho_1 \rho_2 N', where \rho_1 is produced at large transverse
momentum, \rho_2 is transversely polarized, and the mesons are separated by a
large rapidity gap. We predict the cross section for this process for both
transverse and longitudinal \rho_{2} production. To this end we propose a model
for the transversity GPD H_T(x,\xi,t), and give an estimate of the relative
sizes of the transverse and longitudinal \rho_{2} cross sections. We show that
a dedicated experiment at high energy should be able to measure the
transversity content of the proton.
|
[
{
"created": "Tue, 17 Jan 2006 21:01:09 GMT",
"version": "v1"
},
{
"created": "Thu, 16 Mar 2006 20:28:18 GMT",
"version": "v2"
}
] |
2009-01-07
|
[
[
"Enberg",
"R.",
""
],
[
"Pire",
"B.",
""
],
[
"Szymanowski",
"L.",
""
]
] |
The chiral-odd generalized parton distribution (GPD), or transversity GPD, of the nucleon can be accessed experimentally through the photo- or electroproduction of two vector mesons on a polarized nucleon target, \gamma^(*) N --> \rho_1 \rho_2 N', where \rho_1 is produced at large transverse momentum, \rho_2 is transversely polarized, and the mesons are separated by a large rapidity gap. We predict the cross section for this process for both transverse and longitudinal \rho_{2} production. To this end we propose a model for the transversity GPD H_T(x,\xi,t), and give an estimate of the relative sizes of the transverse and longitudinal \rho_{2} cross sections. We show that a dedicated experiment at high energy should be able to measure the transversity content of the proton.
|
2209.06216
|
Kevin Langhoff
|
Kevin Langhoff, Nadav Joseph Outmezguine, Nicholas L. Rodd
|
The Irreducible Axion Background
|
7+14 pages, 2+9 figures; v2 additional references and updated to the
latest INTEGRAL constraints
| null |
10.1103/PhysRevLett.129.241101
|
CERN-TH-2022-148
|
hep-ph astro-ph.CO astro-ph.HE
|
http://creativecommons.org/licenses/by/4.0/
|
Searches for dark matter decaying into photons constrain its lifetime to be
many orders of magnitude larger than the age of the Universe. A corollary
statement is that the abundance of any particle that can decay into photons
over cosmological timescales is constrained to be much smaller than the cold
dark-matter density. We show that an $\textit{irreducible}$ freeze-in
contribution to the relic density of axions is in violation of that statement
in a large portion of the parameter space. This allows us to set stringent
constraints on axions in the mass range $100\rm \;eV - 100\; MeV$. At $10\rm \;
keV$ our constraint on a photophilic axion is $g_{a\gamma \gamma} \lesssim 8.1
\times 10^{-14}~{\rm GeV}^{-1}$, almost three orders of magnitude stronger than
the bounds established using horizontal branch stars; at $100~{\rm keV}$ our
constraint on a photophobic axion coupled to electrons is $g_{aee} \lesssim 8.0
\times 10^{-15}$, almost four orders of magnitude stronger than present
results. Although we focus on axions, our argument is more general and can be
extended to, for instance, sterile neutrinos.
|
[
{
"created": "Tue, 13 Sep 2022 18:00:00 GMT",
"version": "v1"
},
{
"created": "Tue, 20 Sep 2022 14:28:29 GMT",
"version": "v2"
}
] |
2022-12-14
|
[
[
"Langhoff",
"Kevin",
""
],
[
"Outmezguine",
"Nadav Joseph",
""
],
[
"Rodd",
"Nicholas L.",
""
]
] |
Searches for dark matter decaying into photons constrain its lifetime to be many orders of magnitude larger than the age of the Universe. A corollary statement is that the abundance of any particle that can decay into photons over cosmological timescales is constrained to be much smaller than the cold dark-matter density. We show that an $\textit{irreducible}$ freeze-in contribution to the relic density of axions is in violation of that statement in a large portion of the parameter space. This allows us to set stringent constraints on axions in the mass range $100\rm \;eV - 100\; MeV$. At $10\rm \; keV$ our constraint on a photophilic axion is $g_{a\gamma \gamma} \lesssim 8.1 \times 10^{-14}~{\rm GeV}^{-1}$, almost three orders of magnitude stronger than the bounds established using horizontal branch stars; at $100~{\rm keV}$ our constraint on a photophobic axion coupled to electrons is $g_{aee} \lesssim 8.0 \times 10^{-15}$, almost four orders of magnitude stronger than present results. Although we focus on axions, our argument is more general and can be extended to, for instance, sterile neutrinos.
|
1606.03080
|
Yuming Wang
|
Yu-Ming Wang
|
Factorization and dispersion relations for radiative leptonic $B$ decay
|
32 pages, 9 figures
| null |
10.1007/JHEP09(2016)159
|
UWTHPH 2016-10
|
hep-ph hep-ex
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Applying the dispersion approach we compute perturbative QCD corrections to
the power suppressed soft contribution of $B \to \gamma \ell \nu$ at leading
twist. QCD factorization for the $B \to \gamma^{\ast}$ form factors is
demonstrated explicitly for the hard-collinear transverse polarized photon at
one loop, with the aid of the method of regions. While the one-loop hard
function is identical to the matching coefficient of the QCD weak current $\bar
u \, \gamma_{\mu \perp} \, (1- \gamma_5) \, b$ in soft-collinear effective
theory, the jet function from integrating out the hard-collinear fluctuations
differs from the corresponding one entering the factorization formula of $B \to
\gamma \ell \nu$. Furthermore, we evaluate the sub-leading power contribution
to the $B \to \gamma$ form factors from the three-particle $B$-meson
distribution amplitudes (DAs) at tree level. The soft contribution to the $B
\to \gamma$ form factors from the three-particle $B$-meson DAs is shown to be
of the same power compared with the corresponding hard correction, in contrast
to the two-particle counterparts. Numerically the next-to-leading-order QCD
correction to the soft two-particle contribution in $B \to \gamma$ form factors
will induce an approximately $\left (10 \sim 20 \right) \%$ shift to the
tree-level contribution at $\lambda_B(\mu_0)=354 \, {\rm MeV}$. Albeit of power
suppression parametrically, the soft two-particle correction can decrease the
leading power predictions for the $B \to \gamma$ form factors by an amount of
$\left (10 \sim 30 \right) \%$ with the same value of $\lambda_B(\mu_0)$.
Employing the phenomenological model of the three-particle $B$-meson DAs
inspired by a QCD sum rule analysis, the three-particle contribution to the $B
\to \gamma$ form factors is predicted to be of ${\cal O} (1 \%)$, at leading
order in $\alpha_s$, with the default theory inputs.
|
[
{
"created": "Thu, 9 Jun 2016 19:36:31 GMT",
"version": "v1"
}
] |
2016-11-03
|
[
[
"Wang",
"Yu-Ming",
""
]
] |
Applying the dispersion approach we compute perturbative QCD corrections to the power suppressed soft contribution of $B \to \gamma \ell \nu$ at leading twist. QCD factorization for the $B \to \gamma^{\ast}$ form factors is demonstrated explicitly for the hard-collinear transverse polarized photon at one loop, with the aid of the method of regions. While the one-loop hard function is identical to the matching coefficient of the QCD weak current $\bar u \, \gamma_{\mu \perp} \, (1- \gamma_5) \, b$ in soft-collinear effective theory, the jet function from integrating out the hard-collinear fluctuations differs from the corresponding one entering the factorization formula of $B \to \gamma \ell \nu$. Furthermore, we evaluate the sub-leading power contribution to the $B \to \gamma$ form factors from the three-particle $B$-meson distribution amplitudes (DAs) at tree level. The soft contribution to the $B \to \gamma$ form factors from the three-particle $B$-meson DAs is shown to be of the same power compared with the corresponding hard correction, in contrast to the two-particle counterparts. Numerically the next-to-leading-order QCD correction to the soft two-particle contribution in $B \to \gamma$ form factors will induce an approximately $\left (10 \sim 20 \right) \%$ shift to the tree-level contribution at $\lambda_B(\mu_0)=354 \, {\rm MeV}$. Albeit of power suppression parametrically, the soft two-particle correction can decrease the leading power predictions for the $B \to \gamma$ form factors by an amount of $\left (10 \sim 30 \right) \%$ with the same value of $\lambda_B(\mu_0)$. Employing the phenomenological model of the three-particle $B$-meson DAs inspired by a QCD sum rule analysis, the three-particle contribution to the $B \to \gamma$ form factors is predicted to be of ${\cal O} (1 \%)$, at leading order in $\alpha_s$, with the default theory inputs.
|
hep-ph/0510078
|
Stephen Clark
|
Stephen Clark (ITP/LPPC)
|
Particle production from Q-balls
| null |
Nucl.Phys. B756 (2006) 38-70
|
10.1016/j.nuclphysb.2006.08.019
| null |
hep-ph
| null |
Non topological solitons, Q-balls can arise in many particle theories with
U(1) global symmetries. As was shown by Cohen et al. \cite{Qballscohen}, if the
corresponding scalar field couples to massless fermions, large Q-balls are
unstable and evaporate, producing a fermion flux proportional to the Q-ball's
surface. In this paper we analyse Q-ball instabilities as a function of Q-ball
size ans fermion mass. In particular, we construct an exact quantum-mechanical
description of the evaporating Q-ball. This new construction provides an
alternative method to compute Q-Ball's evaporation rates. We shall also find
the new expression for the upper bound on evaporation as a function of the
produced fermion mass and study the effects of Q ball's size on particle
production.
|
[
{
"created": "Thu, 6 Oct 2005 15:43:01 GMT",
"version": "v1"
},
{
"created": "Sun, 20 Nov 2005 19:42:01 GMT",
"version": "v2"
},
{
"created": "Thu, 12 Jan 2006 17:31:47 GMT",
"version": "v3"
},
{
"created": "Tue, 24 Jan 2006 10:57:51 GMT",
"version": "v4"
},
{
"created": "Mon, 27 Mar 2006 08:59:04 GMT",
"version": "v5"
},
{
"created": "Tue, 4 Jul 2006 11:30:13 GMT",
"version": "v6"
}
] |
2009-11-11
|
[
[
"Clark",
"Stephen",
"",
"ITP/LPPC"
]
] |
Non topological solitons, Q-balls can arise in many particle theories with U(1) global symmetries. As was shown by Cohen et al. \cite{Qballscohen}, if the corresponding scalar field couples to massless fermions, large Q-balls are unstable and evaporate, producing a fermion flux proportional to the Q-ball's surface. In this paper we analyse Q-ball instabilities as a function of Q-ball size ans fermion mass. In particular, we construct an exact quantum-mechanical description of the evaporating Q-ball. This new construction provides an alternative method to compute Q-Ball's evaporation rates. We shall also find the new expression for the upper bound on evaporation as a function of the produced fermion mass and study the effects of Q ball's size on particle production.
|
hep-ph/9504344
| null |
J.P. Ma and B.H.J. McKellar
|
A Nonperturbative Study of Quarkonium Systems
|
10 pages + 2 figures. They are included in one ps-file. uuencoded and
compressed
| null | null |
UM-P-95-11, RCHEP-95-07
|
hep-ph
| null |
Using Nonrelativistic QCD on the lattice we studied the mass spectrum of
quarkonium systems nonperturbatively for a range of the bar quark mass. We
determined two products of the matrix elements involved in quarkonium decays
and studied the mass dependence of the results. We predict from our
calculations the leptonic decay width of $\Upsilon$, and use the mass
dependence to predict the leptonic decay width of $J/\psi$. These calculations
agree with the experimental results. In lattice NRQCD an additional parameter
$n$ is introduced, and we study the sensitivity of our results to the choice of
$n$.
|
[
{
"created": "Thu, 20 Apr 1995 06:49:38 GMT",
"version": "v1"
}
] |
2007-05-23
|
[
[
"Ma",
"J. P.",
""
],
[
"McKellar",
"B. H. J.",
""
]
] |
Using Nonrelativistic QCD on the lattice we studied the mass spectrum of quarkonium systems nonperturbatively for a range of the bar quark mass. We determined two products of the matrix elements involved in quarkonium decays and studied the mass dependence of the results. We predict from our calculations the leptonic decay width of $\Upsilon$, and use the mass dependence to predict the leptonic decay width of $J/\psi$. These calculations agree with the experimental results. In lattice NRQCD an additional parameter $n$ is introduced, and we study the sensitivity of our results to the choice of $n$.
|
1309.7397
|
Nikita Blinov
|
Nikita Blinov and David E. Morrissey
|
Charge and Color Breaking Constraints in the Minimal Supersymmetric
Standard Model
|
6 pages, 2 figures. Presentation at the DPF 2013 Meeting of the
American Physical Society Division of Particles and Fields, Santa Cruz,
California, August 13-17, 2013
| null | null | null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
The scalar potential of the Minimal Supersymmetric Standard Model (MSSM)
admits the existence of vacua with non-vanishing expectation values of
electrically and color charged fields. If such minima are deep enough, the
physical electroweak vacuum is rendered unstable by quantum tunneling. By
comparing the lifetime of the electroweak vacuum with the age of the universe,
the MSSM parameter space can be constrained. Furthermore, the appearance of
charge and color breaking minima associated with the stop sector is strongly
correlated with the Higgs mass, which has been recently measured at the Large
Hadron Collider. We carry out a metastability analysis in the stop sector of
the MSSM, improving upon previous results. We exclude parts of the parameter
space allowed by the Higgs mass measurement.
|
[
{
"created": "Sat, 28 Sep 2013 00:50:54 GMT",
"version": "v1"
}
] |
2013-10-01
|
[
[
"Blinov",
"Nikita",
""
],
[
"Morrissey",
"David E.",
""
]
] |
The scalar potential of the Minimal Supersymmetric Standard Model (MSSM) admits the existence of vacua with non-vanishing expectation values of electrically and color charged fields. If such minima are deep enough, the physical electroweak vacuum is rendered unstable by quantum tunneling. By comparing the lifetime of the electroweak vacuum with the age of the universe, the MSSM parameter space can be constrained. Furthermore, the appearance of charge and color breaking minima associated with the stop sector is strongly correlated with the Higgs mass, which has been recently measured at the Large Hadron Collider. We carry out a metastability analysis in the stop sector of the MSSM, improving upon previous results. We exclude parts of the parameter space allowed by the Higgs mass measurement.
|
1407.7290
|
Bennie F. L. Ward
|
B.F.L. Ward (1) ((1) Baylor University, Waco, TX, USA)
|
New Approach to Hard Corrections in Precision QCD for LHC and FCC
Physics
|
11 pages, 3 figures; improved text; misprints corrected
|
Mod. Phys. Lett. A 31 (2016) 1650126
|
10.1142/S0217732316501261
|
BU-HEPP-14-03
|
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We present a new approach to the realization of hard fixed-order corrections
in predictions for the processes probed in high energy colliding hadron beam
devices, with some emphasis on the LHC and the future FCC devices. We show that
the usual unphysical divergence of such corrections as one approaches the soft
limit is removed in our approach, so that we would render the standard results
to be closer to the observed exclusive distributions. We use the single
Z/\gamma* production and decay to lepton pairs as our prototypical example, but
we stress that the approach has general applicability. In this way, we open
another part of the way to rigorous baselines for the determination of the
theoretical precision tags for LHC physics, with an obvious generalization to
the future FCC as well.
|
[
{
"created": "Sun, 27 Jul 2014 22:44:31 GMT",
"version": "v1"
},
{
"created": "Wed, 1 Oct 2014 13:39:43 GMT",
"version": "v2"
},
{
"created": "Mon, 6 Oct 2014 16:12:22 GMT",
"version": "v3"
}
] |
2016-06-24
|
[
[
"Ward",
"B. F. L.",
"",
"Baylor University, Waco, TX, USA"
]
] |
We present a new approach to the realization of hard fixed-order corrections in predictions for the processes probed in high energy colliding hadron beam devices, with some emphasis on the LHC and the future FCC devices. We show that the usual unphysical divergence of such corrections as one approaches the soft limit is removed in our approach, so that we would render the standard results to be closer to the observed exclusive distributions. We use the single Z/\gamma* production and decay to lepton pairs as our prototypical example, but we stress that the approach has general applicability. In this way, we open another part of the way to rigorous baselines for the determination of the theoretical precision tags for LHC physics, with an obvious generalization to the future FCC as well.
|
1602.02645
|
Adam Falkowski
|
Herm\`es B\'elusca-Ma\"ito and Adam Falkowski
|
On the exotic Higgs decays in effective field theory
|
17 pages; v2: corrections in Section 4.4, references added
|
Eur.Phys.J. C76 (2016) no.9, 514
|
10.1140/epjc/s10052-016-4362-8
|
LPT-Orsay-16-11
|
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We discuss exotic Higgs decays in an effective field theory where the
Standard Model is extended by dimension-6 operators. We review and update the
status of 2-body lepton- and quark-flavor violating decays involving the Higgs
boson. We also comment on the possibility of observing 3-body flavor-violating
Higgs decays in this context.
|
[
{
"created": "Mon, 8 Feb 2016 16:50:43 GMT",
"version": "v1"
},
{
"created": "Mon, 18 Apr 2016 15:04:35 GMT",
"version": "v2"
}
] |
2017-01-04
|
[
[
"Bélusca-Maïto",
"Hermès",
""
],
[
"Falkowski",
"Adam",
""
]
] |
We discuss exotic Higgs decays in an effective field theory where the Standard Model is extended by dimension-6 operators. We review and update the status of 2-body lepton- and quark-flavor violating decays involving the Higgs boson. We also comment on the possibility of observing 3-body flavor-violating Higgs decays in this context.
|
hep-ph/0512231
|
Thorsten Ewerth
|
Thorsten Ewerth (Bern U.)
|
Upper Bounds on Rare K and B Decays from MFV
|
4 pages, 10 figures, To appear in the proceedings of the
International Europhysics Conference on High Energy Physics, 21-27 July 2005,
Lisboa, Portugal
| null | null | null |
hep-ph
| null |
Recently, we studied the branching ratios of rare K and B decays in models
with Minimal Flavor Violation (MFV) using the presently available information
from the universal unitarity triangle analysis and from the measurements of
Br(B -> Xs gamma), Br(B -> Xs l+l-) and Br(K+ -> pi+ nu nubar). We analyzed in
detail possible scenarios with positive or negative interference of Standard
Model (SM) and New Physics contributions. In particular, we derived upper
bounds on various rare decays and pointed out an interesting triple correlation
between B -> Xs gamma, B -> Xs l+l- and K+ -> pi+ nu nubar present in MFV
models.
|
[
{
"created": "Mon, 19 Dec 2005 12:42:01 GMT",
"version": "v1"
}
] |
2007-05-23
|
[
[
"Ewerth",
"Thorsten",
"",
"Bern U."
]
] |
Recently, we studied the branching ratios of rare K and B decays in models with Minimal Flavor Violation (MFV) using the presently available information from the universal unitarity triangle analysis and from the measurements of Br(B -> Xs gamma), Br(B -> Xs l+l-) and Br(K+ -> pi+ nu nubar). We analyzed in detail possible scenarios with positive or negative interference of Standard Model (SM) and New Physics contributions. In particular, we derived upper bounds on various rare decays and pointed out an interesting triple correlation between B -> Xs gamma, B -> Xs l+l- and K+ -> pi+ nu nubar present in MFV models.
|
2312.07272
|
Yandong Liu
|
Qing-Hong Cao, Kun Cheng, Yandong Liu and Xiao-Rui Wang
|
Measuring $hhWW$ Coupling at Lepton Colliders
|
18 pages, 9 figures
| null | null | null |
hep-ph hep-ex
|
http://creativecommons.org/licenses/by/4.0/
|
The quartic Higgs-gauge-boson coupling $g_{hhWW}$ is sensitive to the
electroweak symmetry breaking mechanism, however, it is challenging to be
measured at the large hadron collider. We show that the coupling can be well
probed at future lepton colliders through di-Higgs boson production via the
vector boson fusion channel. We perform a detailed simulation of
$\ell^+\ell^-\to \nu\bar\nu hh\to 4b\,+ \!\!\not{\!\! E}_T$ with parton
showering effects at $e^+e^-$, $\mu^+\mu^-$ and $e^-\mu^+$ colliders. We find
that the regions of $g_{hhWW}/g_{hhWW}^{\rm SM}<0.86$ and
$g_{hhWW}/g_{hhWW}^{\rm SM}>1.32$ can be discovered at the $5\sigma$ confidence
level at the 10 TeV $\mu^+ \mu^-$ collider with an integrated luminosity of 3
ab$^{-1}$.
|
[
{
"created": "Tue, 12 Dec 2023 13:52:12 GMT",
"version": "v1"
}
] |
2023-12-13
|
[
[
"Cao",
"Qing-Hong",
""
],
[
"Cheng",
"Kun",
""
],
[
"Liu",
"Yandong",
""
],
[
"Wang",
"Xiao-Rui",
""
]
] |
The quartic Higgs-gauge-boson coupling $g_{hhWW}$ is sensitive to the electroweak symmetry breaking mechanism, however, it is challenging to be measured at the large hadron collider. We show that the coupling can be well probed at future lepton colliders through di-Higgs boson production via the vector boson fusion channel. We perform a detailed simulation of $\ell^+\ell^-\to \nu\bar\nu hh\to 4b\,+ \!\!\not{\!\! E}_T$ with parton showering effects at $e^+e^-$, $\mu^+\mu^-$ and $e^-\mu^+$ colliders. We find that the regions of $g_{hhWW}/g_{hhWW}^{\rm SM}<0.86$ and $g_{hhWW}/g_{hhWW}^{\rm SM}>1.32$ can be discovered at the $5\sigma$ confidence level at the 10 TeV $\mu^+ \mu^-$ collider with an integrated luminosity of 3 ab$^{-1}$.
|
2004.03213
|
Khiem Hong Phan
|
Khiem Hong Phan and Dzung Tri Tran
|
Hypergeometric presentation for one-loop contributing to $H\rightarrow
Z\gamma$
|
18 pages, 2 figures, 2 Tables of data
|
Prog Theor Exp Phys (2020)
|
10.1093/ptep/ptaa061
|
HCMUS-2020-01
|
hep-ph
|
http://creativecommons.org/licenses/by/4.0/
|
In this paper, new analytic formulas for one-loop contributing to Higgs decay
channel $H \rightarrow Z\gamma$ are presented in terms of hypergeometric
functions. The calculations are performed by following the technique for tensor
one-loop reduction developed in [A.~I.~Davydychev, Phys.\ Lett.\ B {\bf 263}
(1991) 107]. For the first time, one-loop form factors for the decay process
are shown which are valid at arbitrary space-time dimension $d$.
|
[
{
"created": "Tue, 7 Apr 2020 09:05:55 GMT",
"version": "v1"
}
] |
2020-06-03
|
[
[
"Phan",
"Khiem Hong",
""
],
[
"Tran",
"Dzung Tri",
""
]
] |
In this paper, new analytic formulas for one-loop contributing to Higgs decay channel $H \rightarrow Z\gamma$ are presented in terms of hypergeometric functions. The calculations are performed by following the technique for tensor one-loop reduction developed in [A.~I.~Davydychev, Phys.\ Lett.\ B {\bf 263} (1991) 107]. For the first time, one-loop form factors for the decay process are shown which are valid at arbitrary space-time dimension $d$.
|
2010.13760
|
Paride Paradisi
|
Luca Di Luzio, Ramona Gr\"ober, Paride Paradisi
|
Hunting for CP-violating axionlike particle interactions
|
v3: 6 pages, 3 figures. Published version
| null |
10.1103/PhysRevD.104.095027
|
DESY 20-183
|
hep-ph hep-ex
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
The impact of axion-like particles (ALPs) on the search of permanent electric
dipole moments (EDMs) of molecules, atoms, nuclei and nucleons is
systematically investigated. We classify first the full set of CP-violating
Jarlskog invariants emerging in the ALP effective field theory (EFT) containing
operators up to dimension-5. Then, we evaluate the leading short-distance
effects to the EDMs up to two-loop order. The high sensitivity of EDMs to
CP-violating ALP interactions is emphasised exploiting both the current and
projected experimental sensitivities.
|
[
{
"created": "Mon, 26 Oct 2020 17:51:01 GMT",
"version": "v1"
},
{
"created": "Thu, 19 Nov 2020 18:08:06 GMT",
"version": "v2"
},
{
"created": "Mon, 6 Dec 2021 13:25:01 GMT",
"version": "v3"
}
] |
2021-12-07
|
[
[
"Di Luzio",
"Luca",
""
],
[
"Gröber",
"Ramona",
""
],
[
"Paradisi",
"Paride",
""
]
] |
The impact of axion-like particles (ALPs) on the search of permanent electric dipole moments (EDMs) of molecules, atoms, nuclei and nucleons is systematically investigated. We classify first the full set of CP-violating Jarlskog invariants emerging in the ALP effective field theory (EFT) containing operators up to dimension-5. Then, we evaluate the leading short-distance effects to the EDMs up to two-loop order. The high sensitivity of EDMs to CP-violating ALP interactions is emphasised exploiting both the current and projected experimental sensitivities.
|
2008.08500
|
Robert Vertesi
|
Antal Gemes (1,2), Robert Vertesi (1), Gabor Papp (3), Gergely Gabor
Barnafoldi (1) ((1) Wigner Research Centre for Physics, (2) Trinity College,
University of Cambridge, (3) Institute of Physics, Eotvos Lorand University)
|
Scaling properties of jet-momentum profiles with multiplicity
|
to appear in the Gribov-90 Memorial Volume: Algebraic Methods in QFT
|
Gribov-90 Memorial Volume, pp. 81-89 (2021)
|
10.1142/9789811238406_0013
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We study the structure of jets in proton-proton collisions at LHC energies
using \textsc{Pythia} 8 Monte Carlo simulations. We demonstrate that the radial
jet profiles exhibit scaling properties with charged-hadron event multiplicity
over a broad transverse-momentum range. We also provide parametrizations of the
jet profiles based on different statistically-motivated analytical
distributions. Based on this we propose that the scaling behavior stems from
fundamental statistical properties of jet fragmentation.
|
[
{
"created": "Wed, 19 Aug 2020 15:20:49 GMT",
"version": "v1"
}
] |
2021-07-13
|
[
[
"Gemes",
"Antal",
""
],
[
"Vertesi",
"Robert",
""
],
[
"Papp",
"Gabor",
""
],
[
"Barnafoldi",
"Gergely Gabor",
""
]
] |
We study the structure of jets in proton-proton collisions at LHC energies using \textsc{Pythia} 8 Monte Carlo simulations. We demonstrate that the radial jet profiles exhibit scaling properties with charged-hadron event multiplicity over a broad transverse-momentum range. We also provide parametrizations of the jet profiles based on different statistically-motivated analytical distributions. Based on this we propose that the scaling behavior stems from fundamental statistical properties of jet fragmentation.
|
hep-ph/9808351
|
Preprints Libr/pam
|
T. Kinoshita
|
NRQED Approach to the Hyperfine Structure of the Muonium Ground State
|
9 page postscript file also available through
http://w4.lns.cornell.edu/public/CLNS
| null | null |
CLNS 98/1578
|
hep-ph hep-th
| null |
The method of NRQED is an adaptation of QED to bound systems. While it is
fully equivalent to QED, it enables us to explore the QED bound states
systematically as an expansion in the fine structure constant $\alpha$ and
velocity ($\sim Z\alpha$) of the bound electron. I describe how to construct
the NRQED Hamiltonian choosing recent works on the $\alpha (Z\alpha)$,
$\alpha^2 (Z\alpha)$,$\alpha (Z\alpha)^2$, $\alpha (Z\alpha)^3$, and $\alpha^2
(Z\alpha)^2$ radiative corrections to the hyperfine structure of the muonium
ground state as examples.
|
[
{
"created": "Tue, 18 Aug 1998 15:53:35 GMT",
"version": "v1"
}
] |
2007-05-23
|
[
[
"Kinoshita",
"T.",
""
]
] |
The method of NRQED is an adaptation of QED to bound systems. While it is fully equivalent to QED, it enables us to explore the QED bound states systematically as an expansion in the fine structure constant $\alpha$ and velocity ($\sim Z\alpha$) of the bound electron. I describe how to construct the NRQED Hamiltonian choosing recent works on the $\alpha (Z\alpha)$, $\alpha^2 (Z\alpha)$,$\alpha (Z\alpha)^2$, $\alpha (Z\alpha)^3$, and $\alpha^2 (Z\alpha)^2$ radiative corrections to the hyperfine structure of the muonium ground state as examples.
|
2001.00355
|
Wen-Fei Wang
|
Wen-Fei Wang, Jian Chai and Ai-Jun Ma
|
Contributions of $K^*_0(1430)$ and $K^*_0(1950)$ in the three-body
decays $B\to K\pi h$
|
36pages, 3figures, accepted for publication in JHEP
|
JHEP03(2020)162
|
10.1007/JHEP03(2020)162
| null |
hep-ph hep-ex
|
http://creativecommons.org/licenses/by/4.0/
|
We study the contributions of the resonant states $K_0^{*}(1430)$ and
$K_0^{*}(1950)$ in the three-body decays $B\to K\pi h$ (with $h=\pi, K$) in the
perturbative QCD approach. The crucial nonperturbative input $F_{K\pi}(s)$ in
the distribution amplitudes of the $S$-wave $K\pi$ system is derived from the
matrix element of vacuum to $K\pi$ pair. The $CP$ averaged branching fraction
of the quasi-two-body decay process $B\to K^*_0(1950)h\to K\pi h$ is about one
order smaller than that of the corresponding decay $B\to K^*_0(1430)h\to K\pi
h$. In view of the important contribution from the $S$-wave $K\pi$ system for
the $B\to K\pi h$ decays, it is not appropriate to neglect the $K_0^{*}(1950)$
in the theoretical or experimental studies for the relevant three-body $B$
meson decays. The predictions in this work for the relevant decays are
consistent with the existing experimental data.
|
[
{
"created": "Thu, 2 Jan 2020 08:20:55 GMT",
"version": "v1"
},
{
"created": "Fri, 13 Mar 2020 13:40:01 GMT",
"version": "v2"
},
{
"created": "Mon, 30 Mar 2020 11:34:44 GMT",
"version": "v3"
}
] |
2020-03-31
|
[
[
"Wang",
"Wen-Fei",
""
],
[
"Chai",
"Jian",
""
],
[
"Ma",
"Ai-Jun",
""
]
] |
We study the contributions of the resonant states $K_0^{*}(1430)$ and $K_0^{*}(1950)$ in the three-body decays $B\to K\pi h$ (with $h=\pi, K$) in the perturbative QCD approach. The crucial nonperturbative input $F_{K\pi}(s)$ in the distribution amplitudes of the $S$-wave $K\pi$ system is derived from the matrix element of vacuum to $K\pi$ pair. The $CP$ averaged branching fraction of the quasi-two-body decay process $B\to K^*_0(1950)h\to K\pi h$ is about one order smaller than that of the corresponding decay $B\to K^*_0(1430)h\to K\pi h$. In view of the important contribution from the $S$-wave $K\pi$ system for the $B\to K\pi h$ decays, it is not appropriate to neglect the $K_0^{*}(1950)$ in the theoretical or experimental studies for the relevant three-body $B$ meson decays. The predictions in this work for the relevant decays are consistent with the existing experimental data.
|
hep-ph/0011184
|
Jon Rosner
|
Jonathan L. Rosner
|
Comments on CKM elements
|
6 pages, LaTeX, 1 figure, to be published in Proceedings of Beauty
2000, Kibbutz Maagan, Israel, September 13-18, 2000, edited by S. Erhan, Y.
Rozen, and P. E. Schlein, Nucl. Inst. Meth. A, 2001
|
Nucl.Instrum.Meth.A462:304-306,2001
|
10.1016/S0168-9002(01)00129-2
|
EFI 2000-42
|
hep-ph
| null |
The sensitivity of determination of elements of the Cabibbo-Kobayashi-Maskawa
(CKM) matrix to experimental inputs (particularly $|V_{cb}|$) is discussed and
caution in assigning probable errors is urged.
|
[
{
"created": "Tue, 14 Nov 2000 23:13:17 GMT",
"version": "v1"
}
] |
2010-11-23
|
[
[
"Rosner",
"Jonathan L.",
""
]
] |
The sensitivity of determination of elements of the Cabibbo-Kobayashi-Maskawa (CKM) matrix to experimental inputs (particularly $|V_{cb}|$) is discussed and caution in assigning probable errors is urged.
|
1202.0439
|
Hubert Spiesberger
|
B. A. Kniehl, G. Kramer, I. Schienbein, and H. Spiesberger
|
Inclusive Charmed-Meson Production at the CERN LHC
|
17 pages
| null |
10.1140/epjc/s10052-012-2082-2
|
DESY 12-013, MZ-TH/12-07, LPSC 12019
|
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We present predictions for the inclusive production of charmed hadrons at the
CERN LHC in the general-mass variable-flavor-number scheme at next-to-leading
order. Detailed numerical results are compared to data where available, or
presented in a way to ease future comparisons with experimental results. We
also point out that measurements at large rapidity have the potential to pin
down models of intrinsic charm.
|
[
{
"created": "Thu, 2 Feb 2012 14:24:50 GMT",
"version": "v1"
}
] |
2015-06-04
|
[
[
"Kniehl",
"B. A.",
""
],
[
"Kramer",
"G.",
""
],
[
"Schienbein",
"I.",
""
],
[
"Spiesberger",
"H.",
""
]
] |
We present predictions for the inclusive production of charmed hadrons at the CERN LHC in the general-mass variable-flavor-number scheme at next-to-leading order. Detailed numerical results are compared to data where available, or presented in a way to ease future comparisons with experimental results. We also point out that measurements at large rapidity have the potential to pin down models of intrinsic charm.
|
2101.10334
|
David Curtin
|
Rodolfo Capdevilla, David Curtin, Yonatan Kahn, Gordan Krnjaic
|
A No-Lose Theorem for Discovering the New Physics of $(g-2)_\mu$ at Muon
Colliders
|
56 pages, 9 figures, 5 tables. Added references, fixed typos, no
significant change to results/conclusions. Corrected NBSM dependence of
naturalness bound for EW Scenarios, slightly strengthening theorem. Added
discussion of EW Scenarios with fewer BSM states (Sec 4.8). Added discussion
of avoiding Landau poles to the Planck scale (Sec 4.9). Added comment on
higher loop scenarios (Sec 2)
| null |
10.1103/PhysRevD.105.015028
| null |
hep-ph hep-ex
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We perform a model-exhaustive analysis of all possible beyond Standard Model
(BSM) solutions to the $(g-2)_\mu$ anomaly to study production of the
associated new states at future muon colliders, and formulate a no-lose theorem
for the discovery of new physics if the anomaly is confirmed and weakly coupled
solutions below the GeV scale are excluded. Our goal is to find the highest
possible mass scale of new physics subject only to perturbative unitarity, and
optionally the requirements of minimum flavour violation (MFV) and/or
naturalness. We prove that a 3 TeV muon collider is guaranteed to discover all
BSM scenarios in which $\Delta a_\mu$ is generated by SM singlets with masses
above $\sim $ GeV; lighter singlets will be discovered by upcoming low-energy
experiments. If new states with electroweak quantum numbers contribute to
$(g-2)_\mu$, the minimal requirements of perturbative unitarity guarantee new
charged states below $\mathcal{O}(100 {\rm TeV})$, but this is strongly
disfavoured by stringent constraints on charged lepton flavour violating (CLFV)
decays. Reasonable BSM theories that satisfy CLFV bounds by obeying Minimal
Flavour Violation (MFV) and avoid generating two new hierarchy problems require
the existence of at least one new charged state below $\sim 10$ TeV. This
strongly motivates the construction of high-energy muon colliders, which are
guaranteed to discover new physics: either by producing these new charged
states directly, or by setting a strong lower bound on their mass, which would
empirically prove that the universe is fine-tuned and violates the assumptions
of MFV while somehow not generating large CLFVs. The former case is obviously
the desired outcome, but the latter scenario would perhaps teach us even more
about the universe by profoundly revising our understanding of naturalness,
cosmological vacuum selection, and the SM flavour puzzle.
|
[
{
"created": "Mon, 25 Jan 2021 19:00:02 GMT",
"version": "v1"
},
{
"created": "Fri, 2 Apr 2021 17:24:31 GMT",
"version": "v2"
}
] |
2022-02-09
|
[
[
"Capdevilla",
"Rodolfo",
""
],
[
"Curtin",
"David",
""
],
[
"Kahn",
"Yonatan",
""
],
[
"Krnjaic",
"Gordan",
""
]
] |
We perform a model-exhaustive analysis of all possible beyond Standard Model (BSM) solutions to the $(g-2)_\mu$ anomaly to study production of the associated new states at future muon colliders, and formulate a no-lose theorem for the discovery of new physics if the anomaly is confirmed and weakly coupled solutions below the GeV scale are excluded. Our goal is to find the highest possible mass scale of new physics subject only to perturbative unitarity, and optionally the requirements of minimum flavour violation (MFV) and/or naturalness. We prove that a 3 TeV muon collider is guaranteed to discover all BSM scenarios in which $\Delta a_\mu$ is generated by SM singlets with masses above $\sim $ GeV; lighter singlets will be discovered by upcoming low-energy experiments. If new states with electroweak quantum numbers contribute to $(g-2)_\mu$, the minimal requirements of perturbative unitarity guarantee new charged states below $\mathcal{O}(100 {\rm TeV})$, but this is strongly disfavoured by stringent constraints on charged lepton flavour violating (CLFV) decays. Reasonable BSM theories that satisfy CLFV bounds by obeying Minimal Flavour Violation (MFV) and avoid generating two new hierarchy problems require the existence of at least one new charged state below $\sim 10$ TeV. This strongly motivates the construction of high-energy muon colliders, which are guaranteed to discover new physics: either by producing these new charged states directly, or by setting a strong lower bound on their mass, which would empirically prove that the universe is fine-tuned and violates the assumptions of MFV while somehow not generating large CLFVs. The former case is obviously the desired outcome, but the latter scenario would perhaps teach us even more about the universe by profoundly revising our understanding of naturalness, cosmological vacuum selection, and the SM flavour puzzle.
|
hep-ph/0401212
|
Stephen Adler
|
Stephen L. Adler
|
Further thoughts on supersymmetric $E_8$ as a family and grand
unification theory
|
TeX, 20 pages
| null | null | null |
hep-ph
| null |
We continue the analysis of the possibility of supersymmetric $E_8$ as a
family unification and grand unification theory, this time under the assumption
that there is a vacuum gluino condensate, but that this condensate is {\it not}
accompanied by dynamical generation of a mass gap in the pure $E_8$ gauge
theory. Arguments supporting these assumptions are given. When the $E_8$ theory
is coupled to supergravity, assuming vanishing of the cosmological constant and
a supersymmetry breaking scale of around a TeV, we show that the gluino mass
induced by gravitational coupling to the condensate is of order $10^{-3}$ eV or
smaller, compatible with the fermion (and particularly the neutrino) mass
spectrum. We suggest that composite scalar Higgs superfields can arise from a
chiral glueball in the attractive 3875 channel (and possibly other channels),
permitting the breaking of the original $E_8$ gauge group to a SO(10) grand
unification group, times a SU(3) family symmetry group and an extra U(1)
factor. A general analysis of the Higgs superpotential shows that in the
absence of gravitational couplings, there is always a supersymmetric vacuum in
the (unphysical) limit of infinite Higgs superfields. However, when
gravitational couplings are included, dimensional analysis of the
superpotential shows that the vacuum can be stabilized for finite Higgs
superfields, with the occurrence of dynamical ${\cal F}$-type supersymmetry
breaking. We conclude that an $E_8$ unification may be theoretically viable,
providing an alternative paradigm for low energy model building, in which the
supersymmetric partners of the standard model fermions are vectors, and in
which the only chiral superfields are symmetry breaking Higgs fields.
|
[
{
"created": "Mon, 26 Jan 2004 20:14:51 GMT",
"version": "v1"
},
{
"created": "Fri, 13 Feb 2004 19:30:43 GMT",
"version": "v2"
}
] |
2007-05-23
|
[
[
"Adler",
"Stephen L.",
""
]
] |
We continue the analysis of the possibility of supersymmetric $E_8$ as a family unification and grand unification theory, this time under the assumption that there is a vacuum gluino condensate, but that this condensate is {\it not} accompanied by dynamical generation of a mass gap in the pure $E_8$ gauge theory. Arguments supporting these assumptions are given. When the $E_8$ theory is coupled to supergravity, assuming vanishing of the cosmological constant and a supersymmetry breaking scale of around a TeV, we show that the gluino mass induced by gravitational coupling to the condensate is of order $10^{-3}$ eV or smaller, compatible with the fermion (and particularly the neutrino) mass spectrum. We suggest that composite scalar Higgs superfields can arise from a chiral glueball in the attractive 3875 channel (and possibly other channels), permitting the breaking of the original $E_8$ gauge group to a SO(10) grand unification group, times a SU(3) family symmetry group and an extra U(1) factor. A general analysis of the Higgs superpotential shows that in the absence of gravitational couplings, there is always a supersymmetric vacuum in the (unphysical) limit of infinite Higgs superfields. However, when gravitational couplings are included, dimensional analysis of the superpotential shows that the vacuum can be stabilized for finite Higgs superfields, with the occurrence of dynamical ${\cal F}$-type supersymmetry breaking. We conclude that an $E_8$ unification may be theoretically viable, providing an alternative paradigm for low energy model building, in which the supersymmetric partners of the standard model fermions are vectors, and in which the only chiral superfields are symmetry breaking Higgs fields.
|
hep-ph/0311127
|
Yukihiro Mimura
|
Ilia Gogoladze, Yukihiro Mimura, S. Nandi
|
Model Building with Gauge-Yukawa Unification
|
23 pages
|
Phys.Rev. D69 (2004) 075006
|
10.1103/PhysRevD.69.075006
|
OSU-HEP-03-13
|
hep-ph
| null |
In supersymmetric theories with extra dimensions, the Higgs and matter fields
can be part of the gauge multiplet, so that the Yukawa interactions can arise
from the gauge interactions. This leads to the possibility of gauge-Yukawa
coupling unification, g_i=y_f, in the effective four dimensional theory after
the initial gauge symmetry and the supersymmetry are broken upon orbifold
compactification. We consider gauge-Yukawa unified models based on a variety of
four dimensional symmetries, including SO(10), SU(5), Pati-Salam symmetry,
trinification, and the Standard Model. Only in the case of Pati-Salam and the
Standard Model symmetry, we do obtain gauge-Yukawa unification. Partial
gauge-Yukawa unification is also briefly discussed.
|
[
{
"created": "Mon, 10 Nov 2003 19:10:45 GMT",
"version": "v1"
}
] |
2009-11-10
|
[
[
"Gogoladze",
"Ilia",
""
],
[
"Mimura",
"Yukihiro",
""
],
[
"Nandi",
"S.",
""
]
] |
In supersymmetric theories with extra dimensions, the Higgs and matter fields can be part of the gauge multiplet, so that the Yukawa interactions can arise from the gauge interactions. This leads to the possibility of gauge-Yukawa coupling unification, g_i=y_f, in the effective four dimensional theory after the initial gauge symmetry and the supersymmetry are broken upon orbifold compactification. We consider gauge-Yukawa unified models based on a variety of four dimensional symmetries, including SO(10), SU(5), Pati-Salam symmetry, trinification, and the Standard Model. Only in the case of Pati-Salam and the Standard Model symmetry, we do obtain gauge-Yukawa unification. Partial gauge-Yukawa unification is also briefly discussed.
|
hep-ph/0505085
|
Huazhong Zhang
|
H. Zhang
|
Some Global Aspects of Gauge Anomalies of Semisimple Gauge Groups and
Fermion Generations in GUT and Superstring Theories
|
23 pages
|
Int.J.Mod.Phys.A21:1033-1052,2006
|
10.1142/S0217751X06025341
| null |
hep-ph
| null |
We study more extensively and completely for global gauge anomalies with some
semisimple gauge groups as initiated in ref.1. A detailed and complete proof or
derivation is provided for the Z_2 global gauge anomaly given in ref.1 for a
gauge theory with the semisimple gauge group SU(2)\times SU(2)\times SU(2) in
D=4 dimensions and Weyl fermions in the irreducible representation (IR)
\omega=(2,2,2) with 2 denoting the corresponding dimensions. This Z_2 anomaly
was used in the discussions related to generic SO(10) and supersymmetric SO(10)
unification theories^1 for the total generation numbers of fermions and mirror
fermions. Our result^1 that the global anomaly coefficient formula is given by
A(\omega)=exp[i{\pi}Q_2(\Box)]=-1 in this case with Q_2(\Box) being the Dynkin
index for SU(8) in the fundamental IR (\Box)=(8) is also discussed, and as
shown by our results^1 that the semisimple gauge transformations collectively
may have physical consequences which do not correspond to successive simple
gauge transformations. The similar result given in ref.1 for the Z_2 global
gauge anomaly of gauge group SU(2)\times SU(2) is also discussed. We also give
a complete proof for some relevent topological results. Gauge anomalies for the
relevant semisimple gauge groups are also briefly discussed in higher
dimensions, especially for self-contragredient representations, with
discussions involving trace identities relating to ref.14. We also remark the
connection of our results and discussions to the total generation numbers in
relevant theories.
|
[
{
"created": "Wed, 11 May 2005 12:31:41 GMT",
"version": "v1"
}
] |
2014-11-18
|
[
[
"Zhang",
"H.",
""
]
] |
We study more extensively and completely for global gauge anomalies with some semisimple gauge groups as initiated in ref.1. A detailed and complete proof or derivation is provided for the Z_2 global gauge anomaly given in ref.1 for a gauge theory with the semisimple gauge group SU(2)\times SU(2)\times SU(2) in D=4 dimensions and Weyl fermions in the irreducible representation (IR) \omega=(2,2,2) with 2 denoting the corresponding dimensions. This Z_2 anomaly was used in the discussions related to generic SO(10) and supersymmetric SO(10) unification theories^1 for the total generation numbers of fermions and mirror fermions. Our result^1 that the global anomaly coefficient formula is given by A(\omega)=exp[i{\pi}Q_2(\Box)]=-1 in this case with Q_2(\Box) being the Dynkin index for SU(8) in the fundamental IR (\Box)=(8) is also discussed, and as shown by our results^1 that the semisimple gauge transformations collectively may have physical consequences which do not correspond to successive simple gauge transformations. The similar result given in ref.1 for the Z_2 global gauge anomaly of gauge group SU(2)\times SU(2) is also discussed. We also give a complete proof for some relevent topological results. Gauge anomalies for the relevant semisimple gauge groups are also briefly discussed in higher dimensions, especially for self-contragredient representations, with discussions involving trace identities relating to ref.14. We also remark the connection of our results and discussions to the total generation numbers in relevant theories.
|
hep-ph/0604198
|
Mar Bastero-Gil
|
M. Bastero-Gil, S. F. King and Q. Shafi
|
Supersymmetric Hybrid Inflation with Non-Minimal Kahler potential
|
14 pages, 5 figures; footnote and reference added
|
Phys.Lett.B651:345-351,2007
|
10.1016/j.physletb.2006.06.085
|
BA-06-14, CERN-PH-TH/2006-071, UG-FT/204/06, CAFPE/74/06
|
hep-ph astro-ph
| null |
Minimal supersymmetric hybrid inflation based on a minimal Kahler potential
predicts a spectral index n_s\gsim 0.98. On the other hand, WMAP three year
data prefers a central value n_s \approx 0.95. We propose a class of
supersymmetric hybrid inflation models based on the same minimal superpotential
but with a non-minimal Kahler potential. Including radiative corrections using
the one-loop effective potential, we show that the prediction for the spectral
index is sensitive to the small non-minimal corrections, and can lead to a
significantly red-tilted spectrum, in agreement with WMAP.
|
[
{
"created": "Mon, 24 Apr 2006 18:08:04 GMT",
"version": "v1"
},
{
"created": "Thu, 27 Apr 2006 17:06:05 GMT",
"version": "v2"
}
] |
2008-11-26
|
[
[
"Bastero-Gil",
"M.",
""
],
[
"King",
"S. F.",
""
],
[
"Shafi",
"Q.",
""
]
] |
Minimal supersymmetric hybrid inflation based on a minimal Kahler potential predicts a spectral index n_s\gsim 0.98. On the other hand, WMAP three year data prefers a central value n_s \approx 0.95. We propose a class of supersymmetric hybrid inflation models based on the same minimal superpotential but with a non-minimal Kahler potential. Including radiative corrections using the one-loop effective potential, we show that the prediction for the spectral index is sensitive to the small non-minimal corrections, and can lead to a significantly red-tilted spectrum, in agreement with WMAP.
|
hep-ph/0211149
|
Mikko Laine
|
M. Laine, H.B. Meyer, K. Rummukainen, M. Shaposhnikov
|
Localisation and mass generation for non-Abelian gauge fields
|
27 pages; small clarifications added
|
JHEP 0301 (2003) 068
|
10.1088/1126-6708/2003/01/068
| null |
hep-ph
| null |
It has been suggested recently that in the presence of suitably "warped"
extra dimensions, the low-energy limit of pure gauge field theory may contain
massive elementary vector bosons localised on a "brane", but no elementary
Higgs scalars. We provide non-perturbative evidence in favour of this
conjecture through numerical lattice measurements of the static quark-antiquark
force of pure SU(2) gauge theory in three dimensions, of which one is warped.
We consider also warpings leading to massless localised vector bosons, and
again find evidence supporting the perturbative prediction, even though the
gauge coupling diverges far from the brane in this case.
|
[
{
"created": "Mon, 11 Nov 2002 20:45:18 GMT",
"version": "v1"
},
{
"created": "Fri, 14 Feb 2003 07:35:57 GMT",
"version": "v2"
}
] |
2009-11-07
|
[
[
"Laine",
"M.",
""
],
[
"Meyer",
"H. B.",
""
],
[
"Rummukainen",
"K.",
""
],
[
"Shaposhnikov",
"M.",
""
]
] |
It has been suggested recently that in the presence of suitably "warped" extra dimensions, the low-energy limit of pure gauge field theory may contain massive elementary vector bosons localised on a "brane", but no elementary Higgs scalars. We provide non-perturbative evidence in favour of this conjecture through numerical lattice measurements of the static quark-antiquark force of pure SU(2) gauge theory in three dimensions, of which one is warped. We consider also warpings leading to massless localised vector bosons, and again find evidence supporting the perturbative prediction, even though the gauge coupling diverges far from the brane in this case.
|
1904.10232
|
Susana Molina Sedgwick
|
Susana Molina Sedgwick, Stephen F. King, Stephen J. Parke, Nicholas W.
Prouse
|
Matter density profile effects on neutrino oscillations at T2HK and
T2HKK
|
Poster + short talk presented at NuPhys2018 (London, 19-21 December
2018). 5 pages, LaTeX, 8 figures. V2: modified title page, added institutions
of collaborators
| null | null |
NuPhys2018-MolinaSedgwick
|
hep-ph hep-ex
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
This project aims to explore the effects that changes in a matter density
profile could have on neutrino oscillations, and whether these could
potentially be seen by the future Hyper-Kamiokande experiment (T2HK). The
analysis is extended to include the possibility of having a second detector in
Korea (T2HKK).
|
[
{
"created": "Tue, 23 Apr 2019 10:08:31 GMT",
"version": "v1"
},
{
"created": "Fri, 24 May 2019 01:29:01 GMT",
"version": "v2"
}
] |
2019-05-27
|
[
[
"Sedgwick",
"Susana Molina",
""
],
[
"King",
"Stephen F.",
""
],
[
"Parke",
"Stephen J.",
""
],
[
"Prouse",
"Nicholas W.",
""
]
] |
This project aims to explore the effects that changes in a matter density profile could have on neutrino oscillations, and whether these could potentially be seen by the future Hyper-Kamiokande experiment (T2HK). The analysis is extended to include the possibility of having a second detector in Korea (T2HKK).
|
0904.0793
|
Kazunori Kohri
|
Kazunori Kohri, David H. Lyth, Cesar A. Valenzuela-Toledo
|
Preheating and the non-gaussianity of the curvature perturbation
|
The discussion around Eqs. (100) and (101) corrected and clarified
(v4), Added new insights into (i) the status of the box size upon which loop
contributions depend and (ii) the relevance for massless preheating of the
numerical simulation of Bond et al. (v3) This paper is dedicated to the
memory of Lev Kofman who died on 12th November 2009
|
JCAP 1002:023,2010; Erratum-ibid.1009:E01,2011
|
10.1088/1475-7516/2010/02/023 10.1088/1475-7516/2010/09/E01
| null |
hep-ph astro-ph.CO hep-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
The perturbation of a light field might affect preheating and hence generate
a contribution to the spectrum and non-gaussianity of the curvature
perturbation \zeta. The field might appear directly in the preheating model
(curvaton-type preheating) or indirectly through its effect on a mass or
coupling (modulated preheating). We give general expressions for \zeta based on
the \delta N formula, and apply them to the cases of quadratic and quartic
chaotic inflation. For the quadratic case, curvaton-type preheating is
ineffective in contributing to \zeta, but modulated preheating can be
effective. For quartic inflation, curvaton-type preheating may be effective but
the usual \delta N formalism has to be modified. We see under what
circumstances the recent numerical simulation of Bond et al. [0903.3407] may be
enough to provide a rough estimate for this case. This paper is dedicated to
the memory of Lev Kofman who died on 12th November 2009
|
[
{
"created": "Mon, 6 Apr 2009 17:31:42 GMT",
"version": "v1"
},
{
"created": "Mon, 1 Jun 2009 22:00:56 GMT",
"version": "v2"
},
{
"created": "Tue, 8 Dec 2009 01:22:02 GMT",
"version": "v3"
},
{
"created": "Wed, 11 Aug 2010 05:23:34 GMT",
"version": "v4"
}
] |
2011-03-18
|
[
[
"Kohri",
"Kazunori",
""
],
[
"Lyth",
"David H.",
""
],
[
"Valenzuela-Toledo",
"Cesar A.",
""
]
] |
The perturbation of a light field might affect preheating and hence generate a contribution to the spectrum and non-gaussianity of the curvature perturbation \zeta. The field might appear directly in the preheating model (curvaton-type preheating) or indirectly through its effect on a mass or coupling (modulated preheating). We give general expressions for \zeta based on the \delta N formula, and apply them to the cases of quadratic and quartic chaotic inflation. For the quadratic case, curvaton-type preheating is ineffective in contributing to \zeta, but modulated preheating can be effective. For quartic inflation, curvaton-type preheating may be effective but the usual \delta N formalism has to be modified. We see under what circumstances the recent numerical simulation of Bond et al. [0903.3407] may be enough to provide a rough estimate for this case. This paper is dedicated to the memory of Lev Kofman who died on 12th November 2009
|
1509.02798
|
Ilkka Helenius
|
Ilkka Helenius, Hannu Paukkunen and Kari J. Eskola
|
Nuclear PDF constraints from p+Pb collisions at the LHC
|
Talk presented at DIS2015 conference, April 27 - May 1, 2015,
Southern Methodist University, Dallas, Texas. v2: updated reference list
| null | null | null |
hep-ph nucl-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
As the current nuclear PDF analyses are mainly constrained by fixed-target
Drell-Yan and deeply inelastic scattering data only the quark nuclear
modifications at fairly large $x$ values are in a good control. Inclusive pion
production in d+Au collisions at RHIC provides some constraints for gluons but
due to the limited kinematic reach of the data the gluon modifications remain
uncertain especially at small values of $x$. In this talk, we discuss how the
existing data from p+Pb collisions at the LHC can improve the nuclear PDF fits
and which measurements would be sensitive to the small-$x$ gluons. In
particular, we consider inclusive hadron production, compare this to direct
photons, and show estimates of the effect of CMS dijet measurements to the
uncertainty of nuclear gluon distributions.
|
[
{
"created": "Wed, 9 Sep 2015 14:56:37 GMT",
"version": "v1"
},
{
"created": "Thu, 1 Oct 2015 15:03:08 GMT",
"version": "v2"
}
] |
2015-10-02
|
[
[
"Helenius",
"Ilkka",
""
],
[
"Paukkunen",
"Hannu",
""
],
[
"Eskola",
"Kari J.",
""
]
] |
As the current nuclear PDF analyses are mainly constrained by fixed-target Drell-Yan and deeply inelastic scattering data only the quark nuclear modifications at fairly large $x$ values are in a good control. Inclusive pion production in d+Au collisions at RHIC provides some constraints for gluons but due to the limited kinematic reach of the data the gluon modifications remain uncertain especially at small values of $x$. In this talk, we discuss how the existing data from p+Pb collisions at the LHC can improve the nuclear PDF fits and which measurements would be sensitive to the small-$x$ gluons. In particular, we consider inclusive hadron production, compare this to direct photons, and show estimates of the effect of CMS dijet measurements to the uncertainty of nuclear gluon distributions.
|
hep-ph/9905308
|
Gavin Salam
|
G.P. Salam
|
BFKL and CCFM final states
|
4 pages. Talk presented at 7th International Workshop on Deep
Inelastic Scattering, Zeuthen, Germany, April 1999
|
Nucl.Phys.Proc.Suppl. 79 (1999) 426-428
|
10.1016/S0920-5632(99)00742-2
|
Bicocca-FT-99-12
|
hep-ph
| null |
I give a brief presentation of recent results on the equivalence of BFKL and
CCFM small-x final states, and discuss their implications for phenomenology.
|
[
{
"created": "Tue, 11 May 1999 18:43:58 GMT",
"version": "v1"
}
] |
2009-10-31
|
[
[
"Salam",
"G. P.",
""
]
] |
I give a brief presentation of recent results on the equivalence of BFKL and CCFM small-x final states, and discuss their implications for phenomenology.
|
hep-ph/0604196
|
David Blaschke
|
D. N. Aguilera, D. Blaschke, H. Grigorian, N. N. Scoccola
|
Nonlocality effects on Color Spin Locking condensates
|
8 pages, 8 figures, 1 table, accepted for publication in Phys.Rev.D
|
Phys.Rev.D74:114005,2006
|
10.1103/PhysRevD.74.114005
| null |
hep-ph astro-ph nucl-th
| null |
We consider the color spin locking (CSL) phase of two-flavor quark matter at
zero temperature for nonlocal instantaneous, separable interactions. We employ
a Lorentzian-type form factor allowing a parametric interpolation between the
sharp (Nambu-Jona-Lasinio (NJL) model) and very smooth (e.g. Gaussian) cut-off
models for systematic studies of the influence on the CSL condensate the
deviation from the NJL model entails. This smoothing of the NJL model form
factor shows advantageous features for the phenomenology of compact stars: (i)
a lowering of the critical chemical potential for the onset of the chiral phase
transition as a prerequisite for stability of hybrid stars with extended quark
matter cores and (ii) a reduction of the smallest pairing gap to the order of
100 keV, being in the range of values interesting for phenomenological studies
of hybrid star cooling evolution.
|
[
{
"created": "Mon, 24 Apr 2006 01:28:03 GMT",
"version": "v1"
},
{
"created": "Mon, 24 Apr 2006 21:15:26 GMT",
"version": "v2"
},
{
"created": "Thu, 11 May 2006 15:11:46 GMT",
"version": "v3"
},
{
"created": "Wed, 22 Nov 2006 17:35:59 GMT",
"version": "v4"
}
] |
2008-11-26
|
[
[
"Aguilera",
"D. N.",
""
],
[
"Blaschke",
"D.",
""
],
[
"Grigorian",
"H.",
""
],
[
"Scoccola",
"N. N.",
""
]
] |
We consider the color spin locking (CSL) phase of two-flavor quark matter at zero temperature for nonlocal instantaneous, separable interactions. We employ a Lorentzian-type form factor allowing a parametric interpolation between the sharp (Nambu-Jona-Lasinio (NJL) model) and very smooth (e.g. Gaussian) cut-off models for systematic studies of the influence on the CSL condensate the deviation from the NJL model entails. This smoothing of the NJL model form factor shows advantageous features for the phenomenology of compact stars: (i) a lowering of the critical chemical potential for the onset of the chiral phase transition as a prerequisite for stability of hybrid stars with extended quark matter cores and (ii) a reduction of the smallest pairing gap to the order of 100 keV, being in the range of values interesting for phenomenological studies of hybrid star cooling evolution.
|
2404.10061
|
Siddhartha Karmakar
|
Siddhartha Karmakar, Amol Dighe and Rick S. Gupta
|
SMEFT predictions for semileptonic processes
|
51 pages, 9 figures, 14 tables
| null | null |
TIFR/TH/24-3
|
hep-ph hep-ex
|
http://creativecommons.org/licenses/by/4.0/
|
The $SU(2)_L\times U(1)_Y$ invariance of the Standard Model Effective Field
Theory (SMEFT) predicts multiple restrictions in the space of Wilson
coefficients of $U(1)_{em}$ invariant effective lagrangians such as the
Low-energy Effective Field Theory (LEFT), used for low-energy flavor-physics
observables, or the Higgs Effective Field Theory (HEFT) in unitary gauge,
appropriate for weak-scale observables. In this work, we derive and list all
such predictions for semileptonic operators up to dimension 6. We find that
these predictions can be expressed as 2223 linear relations among the HEFT/LEFT
Wilson coefficients, that are completely independent of any assumptions about
the alignment of the mass and flavor bases. These relations connect diverse
experimental searches such as rare meson decays, high-$p_T$ dilepton searches,
top decays, $Z$-pole observables, charged lepton flavor violating observables
and non-standard neutrino interaction searches. We demonstrate how these
relations can be used to derive strong indirect constraints on multiple Wilson
coefficients that are currently either weakly constrained from direct
experiments or have no direct bound at all. These relations also imply, in
general, that evidence for new physics in a particular search channel must be
accompanied by correlated anomalies in other channels.
|
[
{
"created": "Mon, 15 Apr 2024 18:06:24 GMT",
"version": "v1"
}
] |
2024-04-17
|
[
[
"Karmakar",
"Siddhartha",
""
],
[
"Dighe",
"Amol",
""
],
[
"Gupta",
"Rick S.",
""
]
] |
The $SU(2)_L\times U(1)_Y$ invariance of the Standard Model Effective Field Theory (SMEFT) predicts multiple restrictions in the space of Wilson coefficients of $U(1)_{em}$ invariant effective lagrangians such as the Low-energy Effective Field Theory (LEFT), used for low-energy flavor-physics observables, or the Higgs Effective Field Theory (HEFT) in unitary gauge, appropriate for weak-scale observables. In this work, we derive and list all such predictions for semileptonic operators up to dimension 6. We find that these predictions can be expressed as 2223 linear relations among the HEFT/LEFT Wilson coefficients, that are completely independent of any assumptions about the alignment of the mass and flavor bases. These relations connect diverse experimental searches such as rare meson decays, high-$p_T$ dilepton searches, top decays, $Z$-pole observables, charged lepton flavor violating observables and non-standard neutrino interaction searches. We demonstrate how these relations can be used to derive strong indirect constraints on multiple Wilson coefficients that are currently either weakly constrained from direct experiments or have no direct bound at all. These relations also imply, in general, that evidence for new physics in a particular search channel must be accompanied by correlated anomalies in other channels.
|
hep-ph/9307367
|
J. Gunion
|
J.F. Gunion
|
Higgs Bosons at an $\bf\epem$ Linear Collider: Theory and Phenomenology
|
26 pages, uses phyzzx.tex, full postscript file including embedded
figures available via anonymous ftp at ucdhep.ucdavis.edu as
[anonymous.gunion]hawaii.ps, preprint number UCD-93-24
| null | null | null |
hep-ph
| null |
I review recent developments in the theory and phenomenology of Higgs bosons
at an $\epem$ linear collider with $\sqrt s$ of order 500 GeV.
|
[
{
"created": "Thu, 29 Jul 1993 20:56:00 GMT",
"version": "v1"
}
] |
2007-05-23
|
[
[
"Gunion",
"J. F.",
""
]
] |
I review recent developments in the theory and phenomenology of Higgs bosons at an $\epem$ linear collider with $\sqrt s$ of order 500 GeV.
|
hep-ph/0007189
|
Alexander Chapovsky
|
A.P. Chapovsky, V.A. Khoze, W.J. Stirling (Durham)
|
Impact of the W boson decay width on photon bremsstrahlung accompanying
W pair production
|
18 pages, 5 figures, LaTeX, uses epsfig
|
Eur.Phys.J.C18:73-82,2000
|
10.1007/s100520000515
| null |
hep-ph
| null |
The bremsstrahlung spectrum of photons accompanying $W$ pair production
depends on the decay width of the unstable $W$ bosons. The dependence arises
from the interference between emission at different stages of the production
and decay process. We present a quantitative discussion of this effect, and
consider the implications for measurements at LEP2 and LC energies.
|
[
{
"created": "Tue, 18 Jul 2000 14:40:57 GMT",
"version": "v1"
}
] |
2011-09-13
|
[
[
"Chapovsky",
"A. P.",
"",
"Durham"
],
[
"Khoze",
"V. A.",
"",
"Durham"
],
[
"Stirling",
"W. J.",
"",
"Durham"
]
] |
The bremsstrahlung spectrum of photons accompanying $W$ pair production depends on the decay width of the unstable $W$ bosons. The dependence arises from the interference between emission at different stages of the production and decay process. We present a quantitative discussion of this effect, and consider the implications for measurements at LEP2 and LC energies.
|
2206.04691
|
Ke-Pan Xie
|
Peisi Huang, Ke-Pan Xie
|
Leptogenesis triggered by a first-order phase transition
|
15 pages + refs, 3 figures. To match the JHEP version
| null |
10.1007/JHEP09(2022)052
| null |
hep-ph astro-ph.CO
|
http://creativecommons.org/licenses/by/4.0/
|
We propose a new scenario of leptogenesis, which is triggered by a
first-order phase transition (FOPT). The right-handed neutrinos (RHNs) are
massless in the old vacuum, while they acquire a mass in the new vacuum
bubbles, and the mass gap is huge compared with the FOPT temperature. The
ultra-relativistic bubble walls sweep the RHNs into the bubbles, where the RHNs
experience fast decay and generate the lepton asymmetry, which is further
converted to the baryon asymmetry of the Universe (BAU). Since the RHNs are out
of equilibrium inside the bubble, the generated BAU does not suffer from the
thermal bath washout. We first discuss the general feature of such a FOPT
leptogenesis mechanism, and then realize it in an extended $B-L$ model. The
gravitational waves from $U(1)_{B-L}$ breaking could be detected at the future
interferometers.
|
[
{
"created": "Thu, 9 Jun 2022 18:00:00 GMT",
"version": "v1"
},
{
"created": "Fri, 26 Aug 2022 02:25:10 GMT",
"version": "v2"
}
] |
2022-09-28
|
[
[
"Huang",
"Peisi",
""
],
[
"Xie",
"Ke-Pan",
""
]
] |
We propose a new scenario of leptogenesis, which is triggered by a first-order phase transition (FOPT). The right-handed neutrinos (RHNs) are massless in the old vacuum, while they acquire a mass in the new vacuum bubbles, and the mass gap is huge compared with the FOPT temperature. The ultra-relativistic bubble walls sweep the RHNs into the bubbles, where the RHNs experience fast decay and generate the lepton asymmetry, which is further converted to the baryon asymmetry of the Universe (BAU). Since the RHNs are out of equilibrium inside the bubble, the generated BAU does not suffer from the thermal bath washout. We first discuss the general feature of such a FOPT leptogenesis mechanism, and then realize it in an extended $B-L$ model. The gravitational waves from $U(1)_{B-L}$ breaking could be detected at the future interferometers.
|
1506.07962
|
Martin Beneke
|
Martin Beneke (TU Munich), Matthias Steinhauser (KIT)
|
Non-relativistic high-energy physics: top production and dark matter
annihilation
|
36 pages, LaTeX
|
Nucl. Part. Phys. Proc. 261-262 378-413 (2015)
|
10.1016/j.nuclphysbps.2015.03.024
|
TUM-HEP 1003/15, TTP14-040, SFB/CPP-14-106
|
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Non-relativistic physics is often associated with atomic physics and
low-energy phenomena of the strong interactions between nuclei and quarks. In
this review we cover three topics in contemporary high-energy physics at or
close to the TeV scale, where non-relativistic dynamics plays an important if
not defining role. We first discuss in detail the third-order corrections to
top-quark pair production in electron-positron collisions in the threshold
region, which plays a major role at a future high-energy e+ e- collider.
Threshold effects are also relevant in the production of heavy particles in
hadronic collisions, where in addition to the Coulomb force soft gluon
radiation contributes to enhanced quantum corrections. We review the joint
resummation of non-relativistic and soft gluon effects for pair production of
top quarks and supersymmetric particles to next-to-next-to-leading logarithmic
accuracy. The third topic deals with pair annihilation of dark matter particles
within the framework of the Minimal Supersymmetric Standard Model. Here the
electroweak Yukawa force generated by the exchange of gauge and Higgs bosons
can cause large "Sommerfeld" enhancements of the annihilation cross section in
some parameter regions.
|
[
{
"created": "Fri, 26 Jun 2015 06:04:46 GMT",
"version": "v1"
}
] |
2015-06-29
|
[
[
"Beneke",
"Martin",
"",
"TU Munich"
],
[
"Steinhauser",
"Matthias",
"",
"KIT"
]
] |
Non-relativistic physics is often associated with atomic physics and low-energy phenomena of the strong interactions between nuclei and quarks. In this review we cover three topics in contemporary high-energy physics at or close to the TeV scale, where non-relativistic dynamics plays an important if not defining role. We first discuss in detail the third-order corrections to top-quark pair production in electron-positron collisions in the threshold region, which plays a major role at a future high-energy e+ e- collider. Threshold effects are also relevant in the production of heavy particles in hadronic collisions, where in addition to the Coulomb force soft gluon radiation contributes to enhanced quantum corrections. We review the joint resummation of non-relativistic and soft gluon effects for pair production of top quarks and supersymmetric particles to next-to-next-to-leading logarithmic accuracy. The third topic deals with pair annihilation of dark matter particles within the framework of the Minimal Supersymmetric Standard Model. Here the electroweak Yukawa force generated by the exchange of gauge and Higgs bosons can cause large "Sommerfeld" enhancements of the annihilation cross section in some parameter regions.
|
hep-ph/0607200
|
Johannes Bluemlein
|
Johannes Bl\"umlein, Helmut B\"ottcher, Alberto Guffanti
|
Non--Singlet QCD Analysis of Deep Inelastic World Data at \boldmath
$O(\alpha_s^3)$
|
35 pages, 15 figure, 1 style file
|
Nucl.Phys.B774:182-207,2007
|
10.1016/j.nuclphysb.2007.03.035
|
DESY 05-012, SFB-CPP-06/33
|
hep-ph hep-ex hep-lat
| null |
A non--singlet QCD analysis of the structure function $F_2(x,q^2)$ in LO,
NLO, NNLO and N$^3$LO is performed based on the world data for charged lepton
scattering. We determine the valence quark parton densities and present their
parameterization and that of the correlated errors in a wide range of $x$ and
$Q^2$. In the analysis we determined the QCD--scale $\Lambda_{\rm QCD, N_f =
4}^{\bar{\rm MS}} = 265 \pm 27 \MeV {\rm (NLO)}, 226 \pm 25 \MeV {\rm (NNLO)},
234 \pm 26 \MeV {\rm (N^3LO)}$, with a remainder uncertainty of $\pm 2\MeV$ for
the yet unknown 4--loop anomalous dimension, corresponding to $\alpha_s(M_Z^2)
= 0.1148 \pm 0.0019 {\rm NLO}, 0.1134 {\tiny{\begin{array}{c} +0.0019 -0.0021
\end{array}}} {\rm NNLO}, 0.1141 {\tiny{\begin{array}{c} +0.0020 -0.0022
\end{array}}} {\rm N^3LO}$. A comparison is performed to other determinations
of the QCD scale and $\alpha_s(M_Z^2)$ in deeply inelastic scattering. The
higher twist contributions of $F_2^p(x,Q^2)$ and $F_2^d(x,Q^2)$ are extracted
in the large $x$ region, subtracting the twist--2 contributions obtained in the
NLO, NNLO and N$^3$LO analysis.
|
[
{
"created": "Tue, 18 Jul 2006 17:55:42 GMT",
"version": "v1"
}
] |
2016-09-06
|
[
[
"Blümlein",
"Johannes",
""
],
[
"Böttcher",
"Helmut",
""
],
[
"Guffanti",
"Alberto",
""
]
] |
A non--singlet QCD analysis of the structure function $F_2(x,q^2)$ in LO, NLO, NNLO and N$^3$LO is performed based on the world data for charged lepton scattering. We determine the valence quark parton densities and present their parameterization and that of the correlated errors in a wide range of $x$ and $Q^2$. In the analysis we determined the QCD--scale $\Lambda_{\rm QCD, N_f = 4}^{\bar{\rm MS}} = 265 \pm 27 \MeV {\rm (NLO)}, 226 \pm 25 \MeV {\rm (NNLO)}, 234 \pm 26 \MeV {\rm (N^3LO)}$, with a remainder uncertainty of $\pm 2\MeV$ for the yet unknown 4--loop anomalous dimension, corresponding to $\alpha_s(M_Z^2) = 0.1148 \pm 0.0019 {\rm NLO}, 0.1134 {\tiny{\begin{array}{c} +0.0019 -0.0021 \end{array}}} {\rm NNLO}, 0.1141 {\tiny{\begin{array}{c} +0.0020 -0.0022 \end{array}}} {\rm N^3LO}$. A comparison is performed to other determinations of the QCD scale and $\alpha_s(M_Z^2)$ in deeply inelastic scattering. The higher twist contributions of $F_2^p(x,Q^2)$ and $F_2^d(x,Q^2)$ are extracted in the large $x$ region, subtracting the twist--2 contributions obtained in the NLO, NNLO and N$^3$LO analysis.
|
hep-ph/9907473
|
Michael Melles
|
Michael Melles
|
Precise measurement of $\Gamma (H \longrightarrow \gamma \gamma)$ at a
PLC and theoretical consequences
|
14 pages, 7 figures, contributed to LP99 at Stanford, CA
|
J.Phys.G25:2243-2252,1999
|
10.1088/0954-3899/25/11/306
|
DTP/99/82
|
hep-ph
| null |
With the LEP II Higgs search approaching exclusion limits on low values of
$\tan \beta \sim 2$ it becomes increasingly important to investigate physical
quantities sensitive to large masses of a pseudoscalar Higgs mass. This regime
is difficult and over a large range of $\tan \beta$ impossible to cover at the
LHC proton proton collider. In this paper we focus on the achievable
statistical precision of the Higgs decay into two photons at a future $\gamma
\gamma$ collider (PLC) in the MSSM mass range below 130 GeV. The MSSM and SM
predictions for $\Gamma (H \longrightarrow \gamma \gamma)$ can differ by up to
10 % even in the decoupling limit of large $m_A$. We summarize recent progress
in both the theoretical understanding of the background process $\gamma \gamma
\longrightarrow q \bar{q}$, $q=\{b,c\}$, and in the expected detector
performance allow for a high accuracy of the lightest MSSM or SM Higgs boson
decay into a $b \bar{b}$ pair. We find that for optimized but still realistic
detector and accelerator assumptions, statistically a 1.4% accuracy is feasible
after about four years of collecting data for a Higgs boson mass which excludes
$\tan \beta <2$.
|
[
{
"created": "Fri, 23 Jul 1999 14:11:14 GMT",
"version": "v1"
}
] |
2008-11-26
|
[
[
"Melles",
"Michael",
""
]
] |
With the LEP II Higgs search approaching exclusion limits on low values of $\tan \beta \sim 2$ it becomes increasingly important to investigate physical quantities sensitive to large masses of a pseudoscalar Higgs mass. This regime is difficult and over a large range of $\tan \beta$ impossible to cover at the LHC proton proton collider. In this paper we focus on the achievable statistical precision of the Higgs decay into two photons at a future $\gamma \gamma$ collider (PLC) in the MSSM mass range below 130 GeV. The MSSM and SM predictions for $\Gamma (H \longrightarrow \gamma \gamma)$ can differ by up to 10 % even in the decoupling limit of large $m_A$. We summarize recent progress in both the theoretical understanding of the background process $\gamma \gamma \longrightarrow q \bar{q}$, $q=\{b,c\}$, and in the expected detector performance allow for a high accuracy of the lightest MSSM or SM Higgs boson decay into a $b \bar{b}$ pair. We find that for optimized but still realistic detector and accelerator assumptions, statistically a 1.4% accuracy is feasible after about four years of collecting data for a Higgs boson mass which excludes $\tan \beta <2$.
|
1503.06423
|
Xin-Qiang Li
|
Gauhar Abbas, Alejandro Celis, Xin-Qiang Li, Jie Lu and Antonio Pich
|
Flavour-changing top decays in the aligned two-Higgs-doublet model
|
24 pages, 5 figures, 10 tables; more discussions and references
added, version accepted by JHEP
| null | null | null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We perform a complete one-loop computation of the two-body flavour-changing
top decays $t \rightarrow c h$ and $t \rightarrow c V$ ($V= \gamma, Z$), within
the aligned two-Higgs-doublet model. We evaluate the impact of the model
parameters on the associated branching ratios, taking into account constraints
from flavour data and measurements of the Higgs properties. Assuming that the
$125$~GeV Higgs corresponds to the lightest CP-even scalar of the CP-conserving
aligned two-Higgs-doublet model, we find that the rates for such
flavour-changing top decays lie below the expected sensitivity of the future
high-luminosity phase of the LHC. Measurements of the Higgs signal strength in
the di-photon channel are found to play an important role in limiting the size
of the $t \rightarrow c h$ decay rate when the charged scalar of the model is
light.
|
[
{
"created": "Sun, 22 Mar 2015 13:11:01 GMT",
"version": "v1"
},
{
"created": "Sun, 31 May 2015 20:42:20 GMT",
"version": "v2"
}
] |
2015-06-02
|
[
[
"Abbas",
"Gauhar",
""
],
[
"Celis",
"Alejandro",
""
],
[
"Li",
"Xin-Qiang",
""
],
[
"Lu",
"Jie",
""
],
[
"Pich",
"Antonio",
""
]
] |
We perform a complete one-loop computation of the two-body flavour-changing top decays $t \rightarrow c h$ and $t \rightarrow c V$ ($V= \gamma, Z$), within the aligned two-Higgs-doublet model. We evaluate the impact of the model parameters on the associated branching ratios, taking into account constraints from flavour data and measurements of the Higgs properties. Assuming that the $125$~GeV Higgs corresponds to the lightest CP-even scalar of the CP-conserving aligned two-Higgs-doublet model, we find that the rates for such flavour-changing top decays lie below the expected sensitivity of the future high-luminosity phase of the LHC. Measurements of the Higgs signal strength in the di-photon channel are found to play an important role in limiting the size of the $t \rightarrow c h$ decay rate when the charged scalar of the model is light.
|
0708.0745
|
Grigori Kirilin
|
G.G. Kirilin, I.S. Terekhov
|
Coulomb corrections to the Delbrueck scattering amplitude at low
energies
|
8 pages, 6 figures
| null |
10.1103/PhysRevA.77.032118
| null |
hep-ph
| null |
In this article, we study the Coulomb corrections to the Delbrueck scattering
amplitude. We consider the limit when the energy of the photon is much less
than the electron mass. The calculations are carried out in the coordinate
representation using the exact relativistic Green function of an electron in a
Coulomb field. The resulting relative corrections are of the order of a few
percent for scattering on for a large charge of the nucleus. We compare the
corrections with the corresponding ones calculated through the dispersion
integral of the pair production cross section and also with the magnetic loop
contribution to the g-factor of a bound electron. The last one is in a good
agreement with our results but the corrections calculated through the
dispersion relation are not.
|
[
{
"created": "Mon, 6 Aug 2007 11:40:25 GMT",
"version": "v1"
}
] |
2009-11-13
|
[
[
"Kirilin",
"G. G.",
""
],
[
"Terekhov",
"I. S.",
""
]
] |
In this article, we study the Coulomb corrections to the Delbrueck scattering amplitude. We consider the limit when the energy of the photon is much less than the electron mass. The calculations are carried out in the coordinate representation using the exact relativistic Green function of an electron in a Coulomb field. The resulting relative corrections are of the order of a few percent for scattering on for a large charge of the nucleus. We compare the corrections with the corresponding ones calculated through the dispersion integral of the pair production cross section and also with the magnetic loop contribution to the g-factor of a bound electron. The last one is in a good agreement with our results but the corrections calculated through the dispersion relation are not.
|
hep-ph/0404254
|
Carlo Ewerz
|
Carlo Ewerz, Otto Nachtmann
|
Towards a Nonperturbative Foundation of the Dipole Picture: I.
Functional Methods
|
38 pages, 14 figures; v2: minor changes, references added, matches
journal version
|
AnnalsPhys.322:1635-1669,2007
|
10.1016/j.aop.2007.04.015
|
HD-THEP-04-17, IFUM-789-FT
|
hep-ph
| null |
This is the first of two papers in which we study real and virtual
photon-proton scattering in a nonperturbative framework. We classify different
contributions to this process and identify the leading contributions at high
energies. We then study the renormalisation of the photon-quark-antiquark
vertex that occurs in the leading contributions. We find something like the
dipole picture in one of these contributions but also find two correction terms
which can potentially become large at small photon virtualities. In the second
paper we will discuss the additional approximations and assumptions that are
necessary to obtain the dipole model of high energy scattering from the results
found here.
|
[
{
"created": "Wed, 28 Apr 2004 12:59:06 GMT",
"version": "v1"
},
{
"created": "Mon, 4 Jun 2007 00:33:00 GMT",
"version": "v2"
}
] |
2008-11-26
|
[
[
"Ewerz",
"Carlo",
""
],
[
"Nachtmann",
"Otto",
""
]
] |
This is the first of two papers in which we study real and virtual photon-proton scattering in a nonperturbative framework. We classify different contributions to this process and identify the leading contributions at high energies. We then study the renormalisation of the photon-quark-antiquark vertex that occurs in the leading contributions. We find something like the dipole picture in one of these contributions but also find two correction terms which can potentially become large at small photon virtualities. In the second paper we will discuss the additional approximations and assumptions that are necessary to obtain the dipole model of high energy scattering from the results found here.
|
1206.4803
|
Nikolas Kauer
|
Nikolas Kauer, Giampiero Passarino
|
Inadequacy of zero-width approximation for a light Higgs boson signal
|
26 pages, 18 figures, 6 tables; added references, expanded
introduction, version to appear in JHEP
| null |
10.1007/JHEP08(2012)116
| null |
hep-ph hep-ex
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
In the Higgs search at the LHC, a light Higgs boson (115 GeV <~ M_H <~ 130
GeV) is not excluded by experimental data. In this mass range, the width of the
Standard Model Higgs boson is more than four orders of magnitude smaller than
its mass. The zero-width approximation is hence expected to be an excellent
approximation. We show that this is not always the case. The inclusion of
off-shell contributions is essential to obtain an accurate Higgs signal
normalisation at the 1% precision level. For gg (-> H) -> VV, V= W,Z, O(10%)
corrections occur due to an enhanced Higgs signal in the region M_VV > 2 M_V,
where also sizable Higgs-continuum interference occurs. We discuss how
experimental selection cuts can be used to exclude this region in search
channels where the Higgs invariant mass cannot be reconstructed. We note that
the H -> VV decay modes in weak boson fusion are similarly affected.
|
[
{
"created": "Thu, 21 Jun 2012 08:13:25 GMT",
"version": "v1"
},
{
"created": "Thu, 2 Aug 2012 23:34:21 GMT",
"version": "v2"
}
] |
2015-06-05
|
[
[
"Kauer",
"Nikolas",
""
],
[
"Passarino",
"Giampiero",
""
]
] |
In the Higgs search at the LHC, a light Higgs boson (115 GeV <~ M_H <~ 130 GeV) is not excluded by experimental data. In this mass range, the width of the Standard Model Higgs boson is more than four orders of magnitude smaller than its mass. The zero-width approximation is hence expected to be an excellent approximation. We show that this is not always the case. The inclusion of off-shell contributions is essential to obtain an accurate Higgs signal normalisation at the 1% precision level. For gg (-> H) -> VV, V= W,Z, O(10%) corrections occur due to an enhanced Higgs signal in the region M_VV > 2 M_V, where also sizable Higgs-continuum interference occurs. We discuss how experimental selection cuts can be used to exclude this region in search channels where the Higgs invariant mass cannot be reconstructed. We note that the H -> VV decay modes in weak boson fusion are similarly affected.
|
hep-ph/0505011
|
Edward Shuryak
|
E.V.Shuryak
|
Toward dynamical understanding of the diquarks, pentaquarks and
dibaryons
|
A talk at Hadronic Physics Group meeting at Fermilab, Nov.2004
|
J.Phys.Conf.Ser. 9 (2005) 213-217
|
10.1088/1742-6596/9/1/039
| null |
hep-ph
| null |
QCD instantons are known to produce deeply bound diquarks. We study whether
it may be used as building blocks in the formation of multiquark states, in
particular pentaquarks and dibaryons.
A simple model is presented in which the lowest scalar diquark (and possibly
the tensor one) can be treated as an independent ``body'', with the same color
and (approximately) the same mass as a constituent (anti)quark. In it a new
symmetry exists between states with the same number of ``bodies'' but different
number of quarks appear, in particular the 3-``body'' pentaquarks can be
naturally related to some excited baryons. The limitations of this model are
seen from the fact that it leads to light dibaryon $H$. Another reported work
is based on a calculation of a large set of correlation functions for nonlocal
operators with 4 to 6 light quarks in the Random Instanton Liquid Model (RILM).
The effective interaction between diquarks is studied and found to posses a
strongly {\em repulsive core}, due to the Pauli principle for quark zero modes.
|
[
{
"created": "Sun, 1 May 2005 16:34:18 GMT",
"version": "v1"
}
] |
2016-09-06
|
[
[
"Shuryak",
"E. V.",
""
]
] |
QCD instantons are known to produce deeply bound diquarks. We study whether it may be used as building blocks in the formation of multiquark states, in particular pentaquarks and dibaryons. A simple model is presented in which the lowest scalar diquark (and possibly the tensor one) can be treated as an independent ``body'', with the same color and (approximately) the same mass as a constituent (anti)quark. In it a new symmetry exists between states with the same number of ``bodies'' but different number of quarks appear, in particular the 3-``body'' pentaquarks can be naturally related to some excited baryons. The limitations of this model are seen from the fact that it leads to light dibaryon $H$. Another reported work is based on a calculation of a large set of correlation functions for nonlocal operators with 4 to 6 light quarks in the Random Instanton Liquid Model (RILM). The effective interaction between diquarks is studied and found to posses a strongly {\em repulsive core}, due to the Pauli principle for quark zero modes.
|
hep-ph/9509401
|
Marcus Hutter
|
Marcus Hutter
|
The mass of the eta' in self-dual QCD
|
6 LaTeX pages
|
Phys.Lett. B367 (1996) 275-278
|
10.1016/0370-2693(95)01411-X
|
LMU-95-14
|
hep-ph
| null |
The QCD gauge field is modeled as an ensemble of statistically independent
selfdual and antiselfdual regions. This model is motivated from instanton
physics. The scale anomaly then allows to relate the topological susceptibility
to the gluon condensate. With the help of Wittens formula for m_eta' and an
estimate of the suppression of the gluon condensate due to light quarks the
mass of the eta' can be related to f_pi and the physical gluon condensate. We
get the quite satisfactory value m_eta'=884+-116 MeV. Using the physical eta'
mass as an input it is in princple possible to get information about the
interaction between instantons and anti-instantons.
|
[
{
"created": "Wed, 27 Sep 1995 12:05:06 GMT",
"version": "v1"
}
] |
2009-10-28
|
[
[
"Hutter",
"Marcus",
""
]
] |
The QCD gauge field is modeled as an ensemble of statistically independent selfdual and antiselfdual regions. This model is motivated from instanton physics. The scale anomaly then allows to relate the topological susceptibility to the gluon condensate. With the help of Wittens formula for m_eta' and an estimate of the suppression of the gluon condensate due to light quarks the mass of the eta' can be related to f_pi and the physical gluon condensate. We get the quite satisfactory value m_eta'=884+-116 MeV. Using the physical eta' mass as an input it is in princple possible to get information about the interaction between instantons and anti-instantons.
|
hep-ph/9602385
|
John Terning
|
Thomas Appelquist, John Terning, L.C.R. Wijewardhana
|
The Zero Temperature Chiral Phase Transition in SU(N) Gauge Theories
|
13 pages, LaTeX, version published in PRL
|
Phys.Rev.Lett. 77 (1996) 1214-1217
|
10.1103/PhysRevLett.77.1214
|
YCTP-P2-96, BUHEP-96-3, UCTP-002-96
|
hep-ph hep-th
| null |
We investigate the zero temperature chiral phase transition in an SU(N) gauge
theory as the number of fermions $N_f$ is varied. We argue that there exists a
critical number of fermions $N_f^c$, above which there is no chiral symmetry
breaking or confinement, and below which both chiral symmetry breaking and
confinement set in. We estimate $N_f^c$ and discuss the nature of the phase
transition.
|
[
{
"created": "Fri, 23 Feb 1996 21:32:14 GMT",
"version": "v1"
},
{
"created": "Thu, 19 Jun 1997 20:25:29 GMT",
"version": "v2"
},
{
"created": "Fri, 20 Jun 1997 17:42:02 GMT",
"version": "v3"
}
] |
2009-10-28
|
[
[
"Appelquist",
"Thomas",
""
],
[
"Terning",
"John",
""
],
[
"Wijewardhana",
"L. C. R.",
""
]
] |
We investigate the zero temperature chiral phase transition in an SU(N) gauge theory as the number of fermions $N_f$ is varied. We argue that there exists a critical number of fermions $N_f^c$, above which there is no chiral symmetry breaking or confinement, and below which both chiral symmetry breaking and confinement set in. We estimate $N_f^c$ and discuss the nature of the phase transition.
|
1512.07789
|
Santosh Kumar Rai
|
Kasinath Das and Santosh Kumar Rai
|
The 750 GeV Diphoton excess in a $U(1)$ hidden symmetry model
|
9 pages, 3 figures. Version accepted for publication in Phys. Rev. D
|
Phys. Rev. D 93, 095007 (2016)
|
10.1103/PhysRevD.93.095007
|
HRI-RECAPP-2015-021
|
hep-ph hep-ex
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Recent results from the experimental collaborations at LHC give hints of a
resonance in the diphoton channel at an invariant mass of 750 GeV. We show that
such a scalar resonance would be possible in an $U(1)$ extension of the SM
where the extended symmetry is hidden and yet to be discovered. We explore the
possibilities of accommodating this excess by introducing a minimal extension
to the matter content and highlight the parameter space that can accommodate
the observed diphoton resonance in the model. The model also predicts new
interesting signals that may be observed at the current LHC run.
|
[
{
"created": "Thu, 24 Dec 2015 11:18:38 GMT",
"version": "v1"
},
{
"created": "Sun, 17 Jan 2016 11:26:39 GMT",
"version": "v2"
},
{
"created": "Mon, 2 May 2016 06:44:18 GMT",
"version": "v3"
}
] |
2016-05-18
|
[
[
"Das",
"Kasinath",
""
],
[
"Rai",
"Santosh Kumar",
""
]
] |
Recent results from the experimental collaborations at LHC give hints of a resonance in the diphoton channel at an invariant mass of 750 GeV. We show that such a scalar resonance would be possible in an $U(1)$ extension of the SM where the extended symmetry is hidden and yet to be discovered. We explore the possibilities of accommodating this excess by introducing a minimal extension to the matter content and highlight the parameter space that can accommodate the observed diphoton resonance in the model. The model also predicts new interesting signals that may be observed at the current LHC run.
|
hep-ph/9802306
|
Andrew Liddle
|
Ana Achucarro, Julian Borrill and Andrew R Liddle
|
The formation rate of semilocal strings
|
5 pages RevTeX file with four figures incorporated (uses RevTeX and
epsf). Matches journal version. Colour images and movies can be found at
http://www.nersc.gov/~borrill/defects/semilocal.html
|
Phys.Rev.Lett.82:3742-3745,1999
|
10.1103/PhysRevLett.82.3742
| null |
hep-ph
| null |
We carry out three-dimensional numerical simulations to investigate the
formation rate of semilocal strings. We find that the back-reaction of the
gauge fields on the scalar field evolution is substantial, and leads to a
significant formation rate in the parameter regime where the semilocal strings
are classically stable. The formation rate can be as large as a third of that
for cosmic strings, depending on the model parameters.
|
[
{
"created": "Thu, 12 Feb 1998 09:02:54 GMT",
"version": "v1"
},
{
"created": "Wed, 14 Apr 1999 10:43:41 GMT",
"version": "v2"
},
{
"created": "Mon, 4 Jun 2001 09:50:31 GMT",
"version": "v3"
}
] |
2014-11-17
|
[
[
"Achucarro",
"Ana",
""
],
[
"Borrill",
"Julian",
""
],
[
"Liddle",
"Andrew R",
""
]
] |
We carry out three-dimensional numerical simulations to investigate the formation rate of semilocal strings. We find that the back-reaction of the gauge fields on the scalar field evolution is substantial, and leads to a significant formation rate in the parameter regime where the semilocal strings are classically stable. The formation rate can be as large as a third of that for cosmic strings, depending on the model parameters.
|
0809.4428
|
Nestor Armesto
|
N. Armesto, C. Pajares and P. Quiroga-Arias
|
Medium dependence of multiplicity distributions in MLLA
|
LaTeX, 9 pages, 4 eps figures; proceedings of the 3rd International
Conference on Hard and Electromagnetic Probes in High-Energy Nuclear
Collisions - Hard Probes 2008 (Illa de A Toxa, Spain, June 8th-14th 2008)
|
Eur.Phys.J.C61:779-784,2009
|
10.1140/epjc/s10052-008-0829-6
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We study the modification of the multiplicity distributions in MLLA due to
the presence of a QCD medium. The medium is introduced though a multiplicative
constant ($f_{med}$) in the soft infrared parts of the kernels of QCD evolution
equations. Using the asymptotic ansatz for quark and gluons mean multiplicities
$<n_G>=e^{\gamma y}$ and $<n_Q>=r^{-1}e^{\gamma y}$ respectively, we study two
cases: fixed $\gamma$ as previously considered in the literature, and fixed
$\alpha_s$. We find opposite behaviors of the dispersion of the multiplicity
distributions with increasing $f_{med}$ in both cases. For fixed $\gamma$ the
dispersion decreases, while for fixed $\alpha_s$ it increases.
|
[
{
"created": "Thu, 25 Sep 2008 15:19:03 GMT",
"version": "v1"
}
] |
2009-07-22
|
[
[
"Armesto",
"N.",
""
],
[
"Pajares",
"C.",
""
],
[
"Quiroga-Arias",
"P.",
""
]
] |
We study the modification of the multiplicity distributions in MLLA due to the presence of a QCD medium. The medium is introduced though a multiplicative constant ($f_{med}$) in the soft infrared parts of the kernels of QCD evolution equations. Using the asymptotic ansatz for quark and gluons mean multiplicities $<n_G>=e^{\gamma y}$ and $<n_Q>=r^{-1}e^{\gamma y}$ respectively, we study two cases: fixed $\gamma$ as previously considered in the literature, and fixed $\alpha_s$. We find opposite behaviors of the dispersion of the multiplicity distributions with increasing $f_{med}$ in both cases. For fixed $\gamma$ the dispersion decreases, while for fixed $\alpha_s$ it increases.
|
0801.0143
|
Soumitra Nandi
|
Soumitra Nandi, Ulrich Nierste
|
Resolving the sign ambiguity in Delta Gamma_s with B_s -> D_s K
|
6 pages, 2 eps figures, typos in Eqs. (8) and (11) corrected
|
Phys.Rev.D77:054010,2008
|
10.1103/PhysRevD.77.054010
|
CU-PHYSICS/15-2007, TTP07-37
|
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
The analysis of tagged B_s -> J/psi phi decays determines the CP phase phi_s
in B_s-anti-B_s mixing with a two-fold ambiguity. The solutions differ in the
sign of cos(phi_s) which equals the sign of the width difference Delta Gamma_s
among the two B_s mass eigenstates. We point out that this ambiguity can be
removed with the help of B_s -> D_s K decays. We compare untagged and tagged
strategies and find the tagged analysis more promising. The removal of the sign
ambiguity in Delta Gamma_s can be done with relatively low statistics and could
therefore be a target for the early stage of B_s -> D_s K studies.
|
[
{
"created": "Sun, 30 Dec 2007 15:44:00 GMT",
"version": "v1"
},
{
"created": "Fri, 28 Mar 2008 10:54:32 GMT",
"version": "v2"
},
{
"created": "Tue, 13 Mar 2012 19:34:54 GMT",
"version": "v3"
}
] |
2012-03-14
|
[
[
"Nandi",
"Soumitra",
""
],
[
"Nierste",
"Ulrich",
""
]
] |
The analysis of tagged B_s -> J/psi phi decays determines the CP phase phi_s in B_s-anti-B_s mixing with a two-fold ambiguity. The solutions differ in the sign of cos(phi_s) which equals the sign of the width difference Delta Gamma_s among the two B_s mass eigenstates. We point out that this ambiguity can be removed with the help of B_s -> D_s K decays. We compare untagged and tagged strategies and find the tagged analysis more promising. The removal of the sign ambiguity in Delta Gamma_s can be done with relatively low statistics and could therefore be a target for the early stage of B_s -> D_s K studies.
|
hep-ph/0609271
|
A. Gynther
|
A. Gynther
|
Pressure of the standard model
|
4 pages, 3 figures, to appear in the proceedings of Strong and
Electroweak Matter 2006
|
Nucl.Phys.A785:106-109,2007
|
10.1016/j.nuclphysa.2006.11.053
|
HIP-2006-43/TH
|
hep-ph
| null |
We review the computation of the thermodynamic pressure of the entire minimal
standard model to three loop order, performed in hep-ph/0510375 and
hep-ph/0512177.
|
[
{
"created": "Tue, 26 Sep 2006 16:39:53 GMT",
"version": "v1"
}
] |
2008-11-26
|
[
[
"Gynther",
"A.",
""
]
] |
We review the computation of the thermodynamic pressure of the entire minimal standard model to three loop order, performed in hep-ph/0510375 and hep-ph/0512177.
|
hep-ph/9808289
|
Gino Isidori
|
G. D'Ambrosio, G. Ecker, G. Isidori and J. Portoles
|
The Decays $K \to \pi \ell^+ \ell^-$ beyond Leading Order in the Chiral
Expansion
|
18 pages, latex
|
JHEP 9808:004,1998
|
10.1088/1126-6708/1998/08/004
|
INFNNA-IV-98/25, UWThPh-1998-45, FTUV-98/61
|
hep-ph hep-ex
| null |
We present a model-independent analysis of $K^+\to\pi^+\ell^+\ell^-$ and
$K_S\to\pi^0\ell^+\ell^-$ decays, including $K\to 3 \pi$ unitarity corrections
and a general decomposition of the dispersive amplitude. From the existing data
on $K^+\to\pi^+ e^+ e^-$ we predict the ratio $R=
B(K^+\to\pi^+\mu^+\mu^-)/B(K^+\to\pi^+ e^+ e^-)$ to be larger than 0.23, in
slight disagreement with the recent measurement $R = 0.167 \pm 0.036$.
Consequences for the $K^\pm \to\pi^\pm e^+ e^-$ charge asymmetries and for the
$K_L\to\pi^0 e^+ e^-$ mode are also discussed.
|
[
{
"created": "Mon, 10 Aug 1998 21:47:34 GMT",
"version": "v1"
}
] |
2010-02-03
|
[
[
"D'Ambrosio",
"G.",
""
],
[
"Ecker",
"G.",
""
],
[
"Isidori",
"G.",
""
],
[
"Portoles",
"J.",
""
]
] |
We present a model-independent analysis of $K^+\to\pi^+\ell^+\ell^-$ and $K_S\to\pi^0\ell^+\ell^-$ decays, including $K\to 3 \pi$ unitarity corrections and a general decomposition of the dispersive amplitude. From the existing data on $K^+\to\pi^+ e^+ e^-$ we predict the ratio $R= B(K^+\to\pi^+\mu^+\mu^-)/B(K^+\to\pi^+ e^+ e^-)$ to be larger than 0.23, in slight disagreement with the recent measurement $R = 0.167 \pm 0.036$. Consequences for the $K^\pm \to\pi^\pm e^+ e^-$ charge asymmetries and for the $K_L\to\pi^0 e^+ e^-$ mode are also discussed.
|
hep-ph/9706494
|
bisWa
|
Biswajoy Brahmachari
|
Recent direct measurement of the Top quark mass and quasi-infrared fixed
point
|
7 pages, Latex with epsf style, 1 figure, captions.sty
|
Mod.Phys.Lett. A12 (1997) 1969-1972
|
10.1142/S0217732397002016
| null |
hep-ph
| null |
We note that the recent direct measurement of the top quark mass at $173.3
\pm 5.6 (stat) \pm 6.2 (syst)$ by D0 collaboration severely constrains the
theoretically attractive infra-red fixed point scenario of the top quark Yukawa
coupling in supersymmetric GUTs. For one-step unified models the above
mentioned measurement bounds the arbitrary but experimentally determinable
parameter $\tan \beta$ to the range $1.3 \le \tan \beta \le 2.1$. Further
crunch on the top quark mass may determine $\tan \beta$ even more accurately
within the fixed point scenario. On the other hand an experimental value of
$\tan \beta > 2.1$ will rule out the fixed point scenario bounding
$h^2_t(M_X)/4 \pi$ to 0.022 from above.
|
[
{
"created": "Tue, 24 Jun 1997 21:39:42 GMT",
"version": "v1"
}
] |
2009-10-30
|
[
[
"Brahmachari",
"Biswajoy",
""
]
] |
We note that the recent direct measurement of the top quark mass at $173.3 \pm 5.6 (stat) \pm 6.2 (syst)$ by D0 collaboration severely constrains the theoretically attractive infra-red fixed point scenario of the top quark Yukawa coupling in supersymmetric GUTs. For one-step unified models the above mentioned measurement bounds the arbitrary but experimentally determinable parameter $\tan \beta$ to the range $1.3 \le \tan \beta \le 2.1$. Further crunch on the top quark mass may determine $\tan \beta$ even more accurately within the fixed point scenario. On the other hand an experimental value of $\tan \beta > 2.1$ will rule out the fixed point scenario bounding $h^2_t(M_X)/4 \pi$ to 0.022 from above.
|
hep-ph/9909432
|
Masanori Miyama
|
S. Kumano and M. Miyama (Saga University)
|
Proton-deuteron asymmetry in Drell-Yan processes and polarized
light-antiquark distributions
|
10 pages, LATEX2e with epsfig.sty, 4 eps figures. Complete postscript
file including the figures is available at http://www-hs.phys.saga-u.ac.jp .
Email: kumanos@cc.saga-u.ac.jp, miyama@cc.saga-u.ac.jp
|
Phys.Lett. B479 (2000) 149-155
|
10.1016/S0370-2693(00)00308-7
|
SAGA-HE-150-1999
|
hep-ph hep-ex nucl-th
| null |
We discuss the relation between the ratio of the proton-deuteron (pd)
Drell-Yan cross section to the proton-proton (pp) one \Delta_{(T)}
\sigma_{pd}/2 \Delta_{(T)} \sigma_{pp} and the flavor asymmetry in polarized
light-antiquark distributions. Using a recent formalism of the polarized pd
Drell-Yan process, we show that the difference between the pp and pd cross
sections is valuable for finding not only the flavor asymmetry in
longitudinally polarized antiquark distributions but also the one in
transversity distributions. It is especially important that we point out the
possibility of measuring the flavor asymmetry in the transversity distributions
because it cannot be found in W production processes and inclusive lepton
scattering due to the chiral-odd property.
|
[
{
"created": "Mon, 20 Sep 1999 04:22:29 GMT",
"version": "v1"
},
{
"created": "Tue, 11 Jan 2000 07:20:52 GMT",
"version": "v2"
}
] |
2009-10-31
|
[
[
"Kumano",
"S.",
"",
"Saga University"
],
[
"Miyama",
"M.",
"",
"Saga University"
]
] |
We discuss the relation between the ratio of the proton-deuteron (pd) Drell-Yan cross section to the proton-proton (pp) one \Delta_{(T)} \sigma_{pd}/2 \Delta_{(T)} \sigma_{pp} and the flavor asymmetry in polarized light-antiquark distributions. Using a recent formalism of the polarized pd Drell-Yan process, we show that the difference between the pp and pd cross sections is valuable for finding not only the flavor asymmetry in longitudinally polarized antiquark distributions but also the one in transversity distributions. It is especially important that we point out the possibility of measuring the flavor asymmetry in the transversity distributions because it cannot be found in W production processes and inclusive lepton scattering due to the chiral-odd property.
|
hep-ph/0303135
|
Prasanta Kumar Das
|
Prasanta Kumar Das and Biswarup Mukhopadhyaya
|
Higgs pair production due to a radion resonance in Randall-Sundrum
model: prospects at the Large Hadron Collider
|
15 pages, latex, 4 eps figures
| null | null | null |
hep-ph
| null |
We consider Higgs pair production at the Large Hadron Collider (LHC) in a
Randall-Sundrum scenario containing a radion field. It is shown that the
enhanced effective coupling of the radion to gluons, together with
contributions from a low-lying radion pole, can provide larger event rates
compared to most new physics possibilities considered so far. We present the
results for both an intermediate mass Higgs and a heavy Higgs, with a detailed
discussion of the background elimination procedure.
|
[
{
"created": "Sun, 16 Mar 2003 05:09:00 GMT",
"version": "v1"
}
] |
2007-05-23
|
[
[
"Das",
"Prasanta Kumar",
""
],
[
"Mukhopadhyaya",
"Biswarup",
""
]
] |
We consider Higgs pair production at the Large Hadron Collider (LHC) in a Randall-Sundrum scenario containing a radion field. It is shown that the enhanced effective coupling of the radion to gluons, together with contributions from a low-lying radion pole, can provide larger event rates compared to most new physics possibilities considered so far. We present the results for both an intermediate mass Higgs and a heavy Higgs, with a detailed discussion of the background elimination procedure.
|
1707.06587
|
Abhass Kumar
|
Sandhya Choubey, Abhass Kumar
|
Inflation and Dark Matter in the Inert Doublet Model
|
21 pages, 7 figures, 1 table; some explanations added; references
added; version published in JHEP
|
JHEP 11 (2017) 080
|
10.1007/JHEP11(2017)080
| null |
hep-ph astro-ph.CO
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We discuss inflation and dark matter in the inert doublet model coupled
non-minimally to gravity where the inert doublet is the inflaton and the
neutral scalar part of the doublet is the dark matter candidate. We calculate
the various inflationary parameters like $n_s$, $r$ and $P_s$ and then proceed
to the reheating phase where the inflaton decays into the Higgs and other gauge
bosons which are non-relativistic owing to high effective masses. These bosons
further decay or annihilate to give relativistic fermions which are finally
responsible for reheating the universe. At the end of the reheating phase, the
inert doublet which was the inflaton enters into thermal equilibrium with the
rest of the plasma and its neutral component later freezes out as cold dark
matter with a mass of about 2 TeV.
|
[
{
"created": "Thu, 20 Jul 2017 16:17:07 GMT",
"version": "v1"
},
{
"created": "Wed, 15 Nov 2017 10:29:08 GMT",
"version": "v2"
}
] |
2017-11-16
|
[
[
"Choubey",
"Sandhya",
""
],
[
"Kumar",
"Abhass",
""
]
] |
We discuss inflation and dark matter in the inert doublet model coupled non-minimally to gravity where the inert doublet is the inflaton and the neutral scalar part of the doublet is the dark matter candidate. We calculate the various inflationary parameters like $n_s$, $r$ and $P_s$ and then proceed to the reheating phase where the inflaton decays into the Higgs and other gauge bosons which are non-relativistic owing to high effective masses. These bosons further decay or annihilate to give relativistic fermions which are finally responsible for reheating the universe. At the end of the reheating phase, the inert doublet which was the inflaton enters into thermal equilibrium with the rest of the plasma and its neutral component later freezes out as cold dark matter with a mass of about 2 TeV.
|
2312.10712
|
Coleridge Faraday
|
Coleridge Faraday, W. A. Horowitz
|
High-$p_T$ Suppression in Small Systems
|
4 pages, 2 figures, Contribution to Quark Matter 2023
| null | null | null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We present first results for leading hadron suppression in small collision
systems, from a convolved radiative and collisional pQCD energy loss model
which receives a short path length correction to the radiative energy loss. We
find that the short path length correction is exceptionally large for light
flavor final states in both small and large collision systems, due to the
disproportionate size of the correction for gluons. We examine various
assumptions underlying the energy loss model through the calculation of energy
loss weighted expectation values of ratios assumed small by the various
assumptions. This calculation shows that the large formation time assumption,
which is utilized by most contemporary energy loss models, is invalid for a
large portion of the phenomenologically relevant parameter space.
|
[
{
"created": "Sun, 17 Dec 2023 13:04:01 GMT",
"version": "v1"
}
] |
2023-12-19
|
[
[
"Faraday",
"Coleridge",
""
],
[
"Horowitz",
"W. A.",
""
]
] |
We present first results for leading hadron suppression in small collision systems, from a convolved radiative and collisional pQCD energy loss model which receives a short path length correction to the radiative energy loss. We find that the short path length correction is exceptionally large for light flavor final states in both small and large collision systems, due to the disproportionate size of the correction for gluons. We examine various assumptions underlying the energy loss model through the calculation of energy loss weighted expectation values of ratios assumed small by the various assumptions. This calculation shows that the large formation time assumption, which is utilized by most contemporary energy loss models, is invalid for a large portion of the phenomenologically relevant parameter space.
|
0909.3182
|
S Dev Sharma
|
S. Dev, Surender Verma and Shivani Gupta
|
Phenomenological Analysis of Hybrid Textures of Neutrinos
|
To appear in Phys. Letts. B. Two figures added
|
Phys.Lett.B687:53-60,2010
|
10.1016/j.physletb.2010.02.055
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We present a comprehensive phenomenological analysis of the allowed hybrid
textures of neutrinos. Out of a total of sixty hybrid textures with one
equality between the elements of neutrino mass matrix and one texture zero only
twenty three are found to be viable at 99% C.L. whereas the earlier analysis
found fifty four to be viable. We examine the phenomenological implications of
the allowed hybrid textures including Majorana type CP-violating phases, 1-3
mixing angle and Dirac type CP-violating phase, $\delta$. We, also, obtain
lower bound on effective Majorana mass for all the allowed hybrid textures.
|
[
{
"created": "Thu, 17 Sep 2009 10:43:44 GMT",
"version": "v1"
},
{
"created": "Wed, 17 Feb 2010 07:57:38 GMT",
"version": "v2"
},
{
"created": "Tue, 23 Feb 2010 10:36:20 GMT",
"version": "v3"
}
] |
2014-11-20
|
[
[
"Dev",
"S.",
""
],
[
"Verma",
"Surender",
""
],
[
"Gupta",
"Shivani",
""
]
] |
We present a comprehensive phenomenological analysis of the allowed hybrid textures of neutrinos. Out of a total of sixty hybrid textures with one equality between the elements of neutrino mass matrix and one texture zero only twenty three are found to be viable at 99% C.L. whereas the earlier analysis found fifty four to be viable. We examine the phenomenological implications of the allowed hybrid textures including Majorana type CP-violating phases, 1-3 mixing angle and Dirac type CP-violating phase, $\delta$. We, also, obtain lower bound on effective Majorana mass for all the allowed hybrid textures.
|
1810.06578
|
Peter Arnold
|
Peter Arnold, Shahin Iqbal and Tanner Rase
|
Strong- vs. weak-coupling pictures of jet quenching: a dry run using QED
|
31 pages + appendices for 48 pages total, 21 figures. [Difference
from version 2: Main change was to eliminate some summary formulas of NLO
rates in section III.B, made unnecessary by a clear summary of formulas
having been added to ref. [13].]
| null |
10.1007/JHEP05(2019)004
| null |
hep-ph nucl-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
High-energy partons ($E \gg T$) traveling through a quark-gluon plasma lose
energy by splitting via bremsstrahlung and pair production. Regardless of
whether or not the quark-gluon plasma itself is strongly coupled, an important
question lying at the heart of philosophically different approaches to energy
loss is whether the high-energy partons of an in-medium shower can be thought
of as a collection of individual particles, or whether their coupling to each
other is also so strong that a description as high-energy `particles' is
inappropriate. We discuss some possible theorists' tests of this question for
simple situations (e.g. an infinite, non-expanding plasma) using thought
experiments and first-principles quantum field theory calculations (with some
simplifying approximations). The physics of in-medium showers is substantially
affected by the Landau-Pomeranchuk-Midgal (LPM) effect, and our proposed tests
require use of what might be called `next-to-leading order' LPM results, which
account for quantum interference between consecutive splittings. The complete
set of such results is not yet available for QCD but is already available for
the theory of large-$N_f$ QED. We therefore use large-$N_f$ QED as an example,
presenting numerical results as a function of $N_f\alpha$, where $\alpha$ is
the strength of the coupling at the relevant high-energy scale characterizing
splittings of the high-energy particles.
|
[
{
"created": "Mon, 15 Oct 2018 18:00:12 GMT",
"version": "v1"
},
{
"created": "Thu, 18 Oct 2018 09:06:12 GMT",
"version": "v2"
},
{
"created": "Tue, 23 Apr 2019 18:00:27 GMT",
"version": "v3"
}
] |
2019-05-22
|
[
[
"Arnold",
"Peter",
""
],
[
"Iqbal",
"Shahin",
""
],
[
"Rase",
"Tanner",
""
]
] |
High-energy partons ($E \gg T$) traveling through a quark-gluon plasma lose energy by splitting via bremsstrahlung and pair production. Regardless of whether or not the quark-gluon plasma itself is strongly coupled, an important question lying at the heart of philosophically different approaches to energy loss is whether the high-energy partons of an in-medium shower can be thought of as a collection of individual particles, or whether their coupling to each other is also so strong that a description as high-energy `particles' is inappropriate. We discuss some possible theorists' tests of this question for simple situations (e.g. an infinite, non-expanding plasma) using thought experiments and first-principles quantum field theory calculations (with some simplifying approximations). The physics of in-medium showers is substantially affected by the Landau-Pomeranchuk-Midgal (LPM) effect, and our proposed tests require use of what might be called `next-to-leading order' LPM results, which account for quantum interference between consecutive splittings. The complete set of such results is not yet available for QCD but is already available for the theory of large-$N_f$ QED. We therefore use large-$N_f$ QED as an example, presenting numerical results as a function of $N_f\alpha$, where $\alpha$ is the strength of the coupling at the relevant high-energy scale characterizing splittings of the high-energy particles.
|
1612.09187
|
Jorge Gamboa
|
Ariel Arza, Jorge Gamboa and Natalia Tapia
|
Photons and Dark Photons Through Breit-Wheeler Processes
|
6pp
| null | null | null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
A variant of quantum electrodynamics coupled to a dark photon through a
kinetic mixing is studied. The analogous of the light-light diagram becomes the
conversion process $\gamma'\gamma' \to \gamma \gamma$ and an expression for the
differential cross section is estimated. For high energies beams, as in LHC,
this differential cross section could be measurable and its magnitude would be
typically similar to the total cross section of neutrinos, {\it i.e.} $\sim
10^{-50}\,{\text{m}}^2$.
|
[
{
"created": "Thu, 29 Dec 2016 16:13:11 GMT",
"version": "v1"
}
] |
2016-12-30
|
[
[
"Arza",
"Ariel",
""
],
[
"Gamboa",
"Jorge",
""
],
[
"Tapia",
"Natalia",
""
]
] |
A variant of quantum electrodynamics coupled to a dark photon through a kinetic mixing is studied. The analogous of the light-light diagram becomes the conversion process $\gamma'\gamma' \to \gamma \gamma$ and an expression for the differential cross section is estimated. For high energies beams, as in LHC, this differential cross section could be measurable and its magnitude would be typically similar to the total cross section of neutrinos, {\it i.e.} $\sim 10^{-50}\,{\text{m}}^2$.
|
2203.12866
|
Manu George
|
Manu George, Chun-Yu Lin, Meng-Ru Wu, Tony G. Liu, Zewei Xiong
|
COSE$\nu$: A Collective Oscillation Simulation Engine for Neutrinos
|
17 pages, 13 figures
|
Computer Physics Communications, 283, 108588, 2023
|
10.1016/j.cpc.2022.108588
| null |
hep-ph astro-ph.HE physics.comp-ph
|
http://creativecommons.org/licenses/by/4.0/
|
We introduce the implementation details of the simulation code \cosenu, which
numerically solves a set of non-linear partial differential equations that
govern the dynamics of neutrino collective flavor conversions. We
systematically provide the details of both the finite difference method
supported by Kreiss-Oliger dissipation and the finite volume method with
seventh order weighted essentially non-oscillatory scheme. To ensure the
reliability of the code, we perform the comparison of the simulation results
with theoretically obtainable solutions. In order to understand and
characterize the error accumulation behavior of the implementations when
neutrino self-interactions are switched on, we also analyze the evolution of
the deviation of the conserved quantities for different values of simulation
parameters. We report the performance of our code with both CPUs and GPUs. The
public version of the \cosenu~package is available at
\url{https://github.com/COSEnu/COSEnu}.
|
[
{
"created": "Thu, 24 Mar 2022 06:12:07 GMT",
"version": "v1"
},
{
"created": "Wed, 16 Nov 2022 17:47:32 GMT",
"version": "v2"
}
] |
2022-11-17
|
[
[
"George",
"Manu",
""
],
[
"Lin",
"Chun-Yu",
""
],
[
"Wu",
"Meng-Ru",
""
],
[
"Liu",
"Tony G.",
""
],
[
"Xiong",
"Zewei",
""
]
] |
We introduce the implementation details of the simulation code \cosenu, which numerically solves a set of non-linear partial differential equations that govern the dynamics of neutrino collective flavor conversions. We systematically provide the details of both the finite difference method supported by Kreiss-Oliger dissipation and the finite volume method with seventh order weighted essentially non-oscillatory scheme. To ensure the reliability of the code, we perform the comparison of the simulation results with theoretically obtainable solutions. In order to understand and characterize the error accumulation behavior of the implementations when neutrino self-interactions are switched on, we also analyze the evolution of the deviation of the conserved quantities for different values of simulation parameters. We report the performance of our code with both CPUs and GPUs. The public version of the \cosenu~package is available at \url{https://github.com/COSEnu/COSEnu}.
|
2109.05530
|
Moha Ouali
|
M. Ouali, M. Ouhammou, S. Taj, R. Benbrik, and B. Manaut
|
Laser-assisted charged Higgs pair production in Inert Higgs Doublet
Model (IHDM)
|
16 pages, 5 figures
| null |
10.1016/j.physletb.2021.136761
| null |
hep-ph
|
http://creativecommons.org/licenses/by/4.0/
|
The production of a pair of charged Higgs bosons from $e^{+}e^{-}$
annihilation in the presence of a circularly polarized laser field is
investigated in Inert Higgs doublet Model (IHDM) at ${e}^{+}{e}^{-}$ colliders.
We have derived the analytical expression for the laser-assisted differential
cross section by using the Dirac-Volkov formalism at leading order including
the $Z$ and $\gamma$ diagrams. Since the laser-free cross section of this
process depends, in the lowest order, only on the mass of the charged Higgs
boson and the energy of the center of mass, we have analyzed the dependence of
the total laser-assisted cross section on these parameters and also on the
laser parameters such as the number of photons exchanged, the laser field
intensity and its frequency. The results found indicate that the
electromagnetic field decreases the order of magnitude of the total cross
section as much as the laser field intensity increases or by decreasing its
frequency. Moreover, it becomes high for low charged Higgs masses and low
center of mass energies.
|
[
{
"created": "Sun, 12 Sep 2021 14:50:36 GMT",
"version": "v1"
}
] |
2021-11-24
|
[
[
"Ouali",
"M.",
""
],
[
"Ouhammou",
"M.",
""
],
[
"Taj",
"S.",
""
],
[
"Benbrik",
"R.",
""
],
[
"Manaut",
"B.",
""
]
] |
The production of a pair of charged Higgs bosons from $e^{+}e^{-}$ annihilation in the presence of a circularly polarized laser field is investigated in Inert Higgs doublet Model (IHDM) at ${e}^{+}{e}^{-}$ colliders. We have derived the analytical expression for the laser-assisted differential cross section by using the Dirac-Volkov formalism at leading order including the $Z$ and $\gamma$ diagrams. Since the laser-free cross section of this process depends, in the lowest order, only on the mass of the charged Higgs boson and the energy of the center of mass, we have analyzed the dependence of the total laser-assisted cross section on these parameters and also on the laser parameters such as the number of photons exchanged, the laser field intensity and its frequency. The results found indicate that the electromagnetic field decreases the order of magnitude of the total cross section as much as the laser field intensity increases or by decreasing its frequency. Moreover, it becomes high for low charged Higgs masses and low center of mass energies.
|
2211.12253
|
Enrico Trotti
|
Enrico Trotti
|
Emergence of ghost in once-subtracted on-shell unitarization in
glueball-glueball scattering
| null | null |
10.1051/epjconf/202227403005
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We investigate the scattering of two scalar glueballs in pure YM theory,
using the well known dilaton potential. We perform the calculations considering
a glueball mass of about $m_G \approx 1.7$ GeV, as predicted by lattice QCD. We
begin with the tree-level theory, but the question about the presence of a
bound state needs a deeper study to be answered. Thus we unitarize the theory
through a self energy loop function consisting of a single subtraction at the
single glueball resonance pole. We show that this choice is inconsistent as it
leads to the emergence of a ghost-like state with negative norm. This problem
is related with the sign of the coefficient in the first order term of the
expansion of the reverse unitarized amplitude. We briefly discuss the solution
which consists of an additional subtraction in the loop function, as presented
in Eur.Phys.J.C 82 (2022) 5, 487.
|
[
{
"created": "Tue, 22 Nov 2022 13:12:34 GMT",
"version": "v1"
}
] |
2023-01-11
|
[
[
"Trotti",
"Enrico",
""
]
] |
We investigate the scattering of two scalar glueballs in pure YM theory, using the well known dilaton potential. We perform the calculations considering a glueball mass of about $m_G \approx 1.7$ GeV, as predicted by lattice QCD. We begin with the tree-level theory, but the question about the presence of a bound state needs a deeper study to be answered. Thus we unitarize the theory through a self energy loop function consisting of a single subtraction at the single glueball resonance pole. We show that this choice is inconsistent as it leads to the emergence of a ghost-like state with negative norm. This problem is related with the sign of the coefficient in the first order term of the expansion of the reverse unitarized amplitude. We briefly discuss the solution which consists of an additional subtraction in the loop function, as presented in Eur.Phys.J.C 82 (2022) 5, 487.
|
hep-ph/0608131
|
Palash Baran Pal
|
Gautam Bhattacharyya, Palash B. Pal, Heinrich P\"as, Thomas J. Weiler
|
Radiative neutrino decay and CP-violation in R-parity violating
supersymmetry
|
Latex, uses axodraw, 14 pages (small changes implemented)
|
Phys.Rev.D74:053006,2006
|
10.1103/PhysRevD.74.053006
|
SINP-TNP/06-21
|
hep-ph
| null |
We calculate the radiative decay amplitude for Majorana neutrinos in
trilinear R-parity violating supersymmetric framework. Our results make no
assumption regarding the masses and mixings of fermions and sfermions. The
results obtained are exemplary for generic models with loop-generated neutrino
masses. Comparison of this amplitude with the neutrino mass matrix shows that
the two provide independent probes of CP-violating phases.
|
[
{
"created": "Fri, 11 Aug 2006 11:56:31 GMT",
"version": "v1"
},
{
"created": "Fri, 8 Sep 2006 11:30:50 GMT",
"version": "v2"
}
] |
2014-11-18
|
[
[
"Bhattacharyya",
"Gautam",
""
],
[
"Pal",
"Palash B.",
""
],
[
"Päs",
"Heinrich",
""
],
[
"Weiler",
"Thomas J.",
""
]
] |
We calculate the radiative decay amplitude for Majorana neutrinos in trilinear R-parity violating supersymmetric framework. Our results make no assumption regarding the masses and mixings of fermions and sfermions. The results obtained are exemplary for generic models with loop-generated neutrino masses. Comparison of this amplitude with the neutrino mass matrix shows that the two provide independent probes of CP-violating phases.
|
hep-ph/9302245
|
Ulf Meissner
|
V. Bernard, A.H. Blin, B. Hiller, U.-G. Mei{\ss}ner and M.C. Ruivo
|
Strong and Radiative Meson Decays in a Generalized Nambu--Jona-Lasinio
Model
|
7 pages, LaTeX, 2 figs available upon request, CRN 92-49
|
Phys.Lett. B305 (1993) 163-167
|
10.1016/0370-2693(93)91122-4
| null |
hep-ph nucl-th
| null |
We investigate strong and radiative meson decays in a generalized
Nambu--Jona-Lasinio model. The one loop order calculation provides a
satisfactory agreement with the data for the mesonic spectrum and for radiative
decays. Higher order effects for strong decays of $\rho$ and $K^*$ are
estimated to be large. We also discuss the role of the flavour mixing
determinantal interaction.
|
[
{
"created": "Wed, 10 Feb 1993 11:56:44 GMT",
"version": "v1"
}
] |
2009-10-22
|
[
[
"Bernard",
"V.",
""
],
[
"Blin",
"A. H.",
""
],
[
"Hiller",
"B.",
""
],
[
"Meißner",
"U. -G.",
""
],
[
"Ruivo",
"M. C.",
""
]
] |
We investigate strong and radiative meson decays in a generalized Nambu--Jona-Lasinio model. The one loop order calculation provides a satisfactory agreement with the data for the mesonic spectrum and for radiative decays. Higher order effects for strong decays of $\rho$ and $K^*$ are estimated to be large. We also discuss the role of the flavour mixing determinantal interaction.
|
1204.3788
|
Nino Bratovic
|
Nino M. Bratovic, Tetsuo Hatsuda and Wolfram Weise
|
Role of Vector Interaction and Axial Anomaly in the PNJL Modeling of the
QCD Phase Diagram
|
8 pages, 3 figures
| null |
10.1016/j.physletb.2013.01.003
| null |
hep-ph nucl-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Effects of a flavor singlet vector interaction in the Polyakov - Nambu -
Jona-Lasinio (PNJL) model are studied in combination with the axial U(1)
breaking Kobayashi - Maskawa - 't Hooft interaction. Using a consistent cutoff
scheme we investigate the QCD phase diagram and its dependence on the vector
coupling strength $g_v$. We find that the first order chiral phase transition
at moderate baryon chemical potentials and its critical point, a generic
feature of most NJL-type models without vector coupling, disappear for
sufficiently large values of $g_v$ that are consistent with lattice QCD results
at imaginary chemical potential. The influence of non-zero $g_v$ on the
curvature of the crossover boundary in the $T-\mu$ plane close to $\mu = 0$ is
also examined.
|
[
{
"created": "Tue, 17 Apr 2012 13:26:43 GMT",
"version": "v1"
}
] |
2015-06-04
|
[
[
"Bratovic",
"Nino M.",
""
],
[
"Hatsuda",
"Tetsuo",
""
],
[
"Weise",
"Wolfram",
""
]
] |
Effects of a flavor singlet vector interaction in the Polyakov - Nambu - Jona-Lasinio (PNJL) model are studied in combination with the axial U(1) breaking Kobayashi - Maskawa - 't Hooft interaction. Using a consistent cutoff scheme we investigate the QCD phase diagram and its dependence on the vector coupling strength $g_v$. We find that the first order chiral phase transition at moderate baryon chemical potentials and its critical point, a generic feature of most NJL-type models without vector coupling, disappear for sufficiently large values of $g_v$ that are consistent with lattice QCD results at imaginary chemical potential. The influence of non-zero $g_v$ on the curvature of the crossover boundary in the $T-\mu$ plane close to $\mu = 0$ is also examined.
|
2012.03713
|
Hyun Min Lee
|
Soo-Min Choi, Hyun Min Lee, Bin Zhu
|
Exothermic dark mesons in light of electron recoil excess at XENON1T
|
28 pages, 4 figures, v2: Typos corrected, Version to be published in
JHEP
| null |
10.1007/JHEP04(2021)251
| null |
hep-ph
|
http://creativecommons.org/licenses/by-nc-sa/4.0/
|
We consider a novel mechanism to realize exothermic dark matter with dark
mesons in the limit of approximate flavor symmetry in a dark QCD. We introduce
a local dark $U(1)'$ symmetry to communicate between dark mesons and the
Standard Model via $Z'$ portal by partially gauging the dark flavor symmetry
with flavor-dependent charges for cancelling chiral anomalies in the dark
sector. After the dark local $U(1)'$ is broken spontaneously by the VEV of a
dark Higgs, there appear small mass splittings between dark quarks,
consequently, leading to small split masses for dark mesons, required to
explain the electron recoil excess in XENON1T by the inelastic scattering
between dark mesons and electron. We propose a concrete benchmark model for
split dark mesons based on $SU(3)_L\times SU(3)_R/ SU(3)_V$ flavor symmetry and
$SU(N_c)$ color group and show that there exists a parameter space making a
better fit to the XENON1T data with two correlated peaks from exothermic
processes and satisfying the correct relic density, current experimental and
theoretical constraints.
|
[
{
"created": "Mon, 7 Dec 2020 14:15:17 GMT",
"version": "v1"
},
{
"created": "Tue, 6 Apr 2021 01:16:37 GMT",
"version": "v2"
}
] |
2021-05-12
|
[
[
"Choi",
"Soo-Min",
""
],
[
"Lee",
"Hyun Min",
""
],
[
"Zhu",
"Bin",
""
]
] |
We consider a novel mechanism to realize exothermic dark matter with dark mesons in the limit of approximate flavor symmetry in a dark QCD. We introduce a local dark $U(1)'$ symmetry to communicate between dark mesons and the Standard Model via $Z'$ portal by partially gauging the dark flavor symmetry with flavor-dependent charges for cancelling chiral anomalies in the dark sector. After the dark local $U(1)'$ is broken spontaneously by the VEV of a dark Higgs, there appear small mass splittings between dark quarks, consequently, leading to small split masses for dark mesons, required to explain the electron recoil excess in XENON1T by the inelastic scattering between dark mesons and electron. We propose a concrete benchmark model for split dark mesons based on $SU(3)_L\times SU(3)_R/ SU(3)_V$ flavor symmetry and $SU(N_c)$ color group and show that there exists a parameter space making a better fit to the XENON1T data with two correlated peaks from exothermic processes and satisfying the correct relic density, current experimental and theoretical constraints.
|
1801.05019
|
Alexander Isayev
|
A. A. Isayev
|
Absolute stability window and upper bound on the magnetic field strength
in a strongly magnetized strange quark star
|
9 pages, 2 figures. arXiv admin note: text overlap with
arXiv:1501.07772
|
Int. J. Mod. Phys. A 29: 1450173, 2014
|
10.1142/S0217751X14501735
| null |
hep-ph astro-ph.HE
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Magnetized strange quark stars, composed of strange quark matter (SQM) and
self-bound by strong interactions, can be formed if the energy per baryon of
magnetized SQM is less than that of the most stable $^{56}$Fe nucleus under the
zero external pressure and temperature. Utilizing the MIT bag model description
of magnetized SQM under charge neutrality and beta equilibrium conditions, the
corresponding absolute stability window in the parameter space of the theory is
determined. It is shown that there exists the maximum magnetic field strength
allowed by the condition of absolute stability of magnetized SQM. The value of
this field, $H\sim3\cdot10^{18}$ G, represents the upper bound on the magnetic
field strength which can be reached in a strongly magnetized strange quark
star.
|
[
{
"created": "Thu, 11 Jan 2018 20:01:51 GMT",
"version": "v1"
}
] |
2018-01-17
|
[
[
"Isayev",
"A. A.",
""
]
] |
Magnetized strange quark stars, composed of strange quark matter (SQM) and self-bound by strong interactions, can be formed if the energy per baryon of magnetized SQM is less than that of the most stable $^{56}$Fe nucleus under the zero external pressure and temperature. Utilizing the MIT bag model description of magnetized SQM under charge neutrality and beta equilibrium conditions, the corresponding absolute stability window in the parameter space of the theory is determined. It is shown that there exists the maximum magnetic field strength allowed by the condition of absolute stability of magnetized SQM. The value of this field, $H\sim3\cdot10^{18}$ G, represents the upper bound on the magnetic field strength which can be reached in a strongly magnetized strange quark star.
|
2305.08783
|
Yang Zhang
|
Zihao Wu, Janko Boehm, Rourou Ma, Hefeng Xu, Yang Zhang
|
NeatIBP 1.0, A package generating small-size integration-by-parts
relations for Feynman integrals
|
minor changes
| null | null |
USTC-ICTS/PCFT-23-15
|
hep-ph hep-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
In this work, we present the package {\sc NeatIBP}, which automatically
generates small-size integration-by-parts (IBP) identities for Feynman
integrals. Based on the syzygy and module intersection techniques, the
generated IBP identities' propagator degree is controlled and thus the size of
the system of IBP identities is shorter than that generated by the standard
Laporta algorithm. This package is powered by the computer algebra systems {\sc
Mathematica} and {\sc Singular}, and the library {\sc SpaSM}. It is
parallelized on the level of Feynman integral sectors. The generated small-size
IBP identities can subsequently be used for either finite field reduction or
analytic reduction. We demonstrate the capabilities of this package on several
multi-loop IBP examples.
|
[
{
"created": "Mon, 15 May 2023 16:43:50 GMT",
"version": "v1"
},
{
"created": "Mon, 12 Jun 2023 07:27:09 GMT",
"version": "v2"
}
] |
2023-06-13
|
[
[
"Wu",
"Zihao",
""
],
[
"Boehm",
"Janko",
""
],
[
"Ma",
"Rourou",
""
],
[
"Xu",
"Hefeng",
""
],
[
"Zhang",
"Yang",
""
]
] |
In this work, we present the package {\sc NeatIBP}, which automatically generates small-size integration-by-parts (IBP) identities for Feynman integrals. Based on the syzygy and module intersection techniques, the generated IBP identities' propagator degree is controlled and thus the size of the system of IBP identities is shorter than that generated by the standard Laporta algorithm. This package is powered by the computer algebra systems {\sc Mathematica} and {\sc Singular}, and the library {\sc SpaSM}. It is parallelized on the level of Feynman integral sectors. The generated small-size IBP identities can subsequently be used for either finite field reduction or analytic reduction. We demonstrate the capabilities of this package on several multi-loop IBP examples.
|
1301.1693
|
Ethan Neil
|
T. Appelquist, R. C. Brower, M. I. Buchoff, M. Cheng, S. D. Cohen, G.
T. Fleming, J. Kiskis, M. F. Lin, E. T. Neil, J. C. Osborn, C. Rebbi, D.
Schaich, C. Schroeder, S. N. Syritsyn, G. Voronov, P. Vranas, J. Wasem
|
Lattice calculation of composite dark matter form factors
|
8 pages, 5 figures. v2: update to journal version
|
Phys. Rev. D88, 014502 (2013)
|
10.1103/PhysRevD.88.014502
|
LLNL-JRNL-608695; NT-LBL-13-002; UCB-NPAT-13-002;
FERMILAB-PUB-13-014-T
|
hep-ph astro-ph.CO hep-lat
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Composite dark matter candidates, which can arise from new strongly-coupled
sectors, are well-motivated and phenomenologically interesting, particularly in
the context of asymmetric generation of the relic density. In this work, we
employ lattice calculations to study the electromagnetic form factors of
electroweak-neutral dark-matter baryons for a three-color, QCD-like theory with
Nf = 2 and 6 degenerate fermions in the fundamental representation. We
calculate the (connected) charge radius and anomalous magnetic moment, both of
which can play a significant role for direct detection of composite dark
matter. We find minimal Nf dependence in these quantities. We generate
mass-dependent cross-sections for dark matter-nucleon interactions and use them
in conjunction with experimental results from XENON100, excluding dark matter
candidates of this type with masses below 10 TeV.
|
[
{
"created": "Tue, 8 Jan 2013 21:05:46 GMT",
"version": "v1"
},
{
"created": "Thu, 18 Jul 2013 19:57:38 GMT",
"version": "v2"
}
] |
2013-07-19
|
[
[
"Appelquist",
"T.",
""
],
[
"Brower",
"R. C.",
""
],
[
"Buchoff",
"M. I.",
""
],
[
"Cheng",
"M.",
""
],
[
"Cohen",
"S. D.",
""
],
[
"Fleming",
"G. T.",
""
],
[
"Kiskis",
"J.",
""
],
[
"Lin",
"M. F.",
""
],
[
"Neil",
"E. T.",
""
],
[
"Osborn",
"J. C.",
""
],
[
"Rebbi",
"C.",
""
],
[
"Schaich",
"D.",
""
],
[
"Schroeder",
"C.",
""
],
[
"Syritsyn",
"S. N.",
""
],
[
"Voronov",
"G.",
""
],
[
"Vranas",
"P.",
""
],
[
"Wasem",
"J.",
""
]
] |
Composite dark matter candidates, which can arise from new strongly-coupled sectors, are well-motivated and phenomenologically interesting, particularly in the context of asymmetric generation of the relic density. In this work, we employ lattice calculations to study the electromagnetic form factors of electroweak-neutral dark-matter baryons for a three-color, QCD-like theory with Nf = 2 and 6 degenerate fermions in the fundamental representation. We calculate the (connected) charge radius and anomalous magnetic moment, both of which can play a significant role for direct detection of composite dark matter. We find minimal Nf dependence in these quantities. We generate mass-dependent cross-sections for dark matter-nucleon interactions and use them in conjunction with experimental results from XENON100, excluding dark matter candidates of this type with masses below 10 TeV.
|
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