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|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
hep-ph/0506244
|
Philip Bechtle
|
Philip Bechtle, Klaus Desch, Peter Wienemann
|
Supersymmetry Parameter Analysis with Fittino
|
6 pages, 2 figures, presented at the Linear Collider Workshop 2005,
Stanford
| null | null |
SLAC-PUB-11295
|
hep-ph
| null |
We present the results of a realistic global fit of the Lagrangian parameters
of the Minimal Supersymmetric Standard Model to simulated data from ILC and LHC
with realistic estimates of the observable uncertainties. Higher order
radiative corrections are accounted for where ever possible to date. Results
are obtained for a modified SPS1a MSSM benchmark scenario but they were checked
not to depend critically on this assumption. Exploiting a simulated annealing
algorithm, a stable result is obtained without any a priori assumptions on the
fit parameters. Most of the Lagrangian parameters can be extracted at the
percent level or better if theoretical uncertainties are neglected. Neither LHC
nor ILC measurements alone will be sufficient to obtain a stable result. The
effects of theoretical uncertainties arising from unknown higher-order
corrections and parametric uncertainties are examined qualitatively. They
appear to be relevant and the result motivates further precision calculations.
|
[
{
"created": "Fri, 24 Jun 2005 00:06:52 GMT",
"version": "v1"
}
] |
2007-05-23
|
[
[
"Bechtle",
"Philip",
""
],
[
"Desch",
"Klaus",
""
],
[
"Wienemann",
"Peter",
""
]
] |
We present the results of a realistic global fit of the Lagrangian parameters of the Minimal Supersymmetric Standard Model to simulated data from ILC and LHC with realistic estimates of the observable uncertainties. Higher order radiative corrections are accounted for where ever possible to date. Results are obtained for a modified SPS1a MSSM benchmark scenario but they were checked not to depend critically on this assumption. Exploiting a simulated annealing algorithm, a stable result is obtained without any a priori assumptions on the fit parameters. Most of the Lagrangian parameters can be extracted at the percent level or better if theoretical uncertainties are neglected. Neither LHC nor ILC measurements alone will be sufficient to obtain a stable result. The effects of theoretical uncertainties arising from unknown higher-order corrections and parametric uncertainties are examined qualitatively. They appear to be relevant and the result motivates further precision calculations.
|
hep-ph/9704305
|
Heinz Konig
|
G. Couture, M. Frank and H. K\"onig
|
Supersymmetric QCD flavor changing top quark decay
|
14 pages, latex, 3 figures
|
Phys. Rev. D 56, 4213 (1997)
|
10.1103/PhysRevD.56.4213
|
UQAM-PHE-97/01, CUMQ/HEP 95
|
hep-ph
| null |
We present a detailed and complete calculation of the gluino and scalar
quarks contribution to the flavour-changing top quark decay into a charm quark
and a photon, gluon, or a Z boson within the minimal supersymmetric standard
model including flavour changing gluino-quarks-scalar quarks couplings in the
right-handed sector. We compare the results with the ones presented in an
earlier paper where we considered flavour changing couplings only in the
left-handed sector. We show that these new couplings have important
consequences leading to a large enhancement when the mixing of the scalar
partners of the left- and right-handed top quark is included. Furthermore CP
violation in the flavour changing top quark decay will occur when a SUSY phase
is taken into account.
|
[
{
"created": "Sat, 12 Apr 1997 02:32:17 GMT",
"version": "v1"
}
] |
2016-08-25
|
[
[
"Couture",
"G.",
""
],
[
"Frank",
"M.",
""
],
[
"König",
"H.",
""
]
] |
We present a detailed and complete calculation of the gluino and scalar quarks contribution to the flavour-changing top quark decay into a charm quark and a photon, gluon, or a Z boson within the minimal supersymmetric standard model including flavour changing gluino-quarks-scalar quarks couplings in the right-handed sector. We compare the results with the ones presented in an earlier paper where we considered flavour changing couplings only in the left-handed sector. We show that these new couplings have important consequences leading to a large enhancement when the mixing of the scalar partners of the left- and right-handed top quark is included. Furthermore CP violation in the flavour changing top quark decay will occur when a SUSY phase is taken into account.
|
2202.12274
|
Brijesh K. Srivastava Dr
|
Aditya Nath Mishra, Guy Pai\'c, Carlos Pajares, Rolf P Scharenberg,
and Brijesh K Srivastava
|
Exploring the QGP phase above the deconfinement temperature in $pp$ and
$A-A$ collisions at LHC energies
|
18 pages, 13 figures. arXiv admin note: text overlap with
arXiv:2006.10169
|
Nucl. Phys. A 1046 (2024) 122865
| null | null |
hep-ph hep-ex nucl-ex
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
In the present work we have analyzed the transverse momentum spectra of
charged particles in high multiplicity ${\it pp}$ collisions at LHC energies
$\sqrt s = $ 5.02 and 13 TeV published by the ALICE Collaboration using the
Color String Percolation Model (CSPM). For heavy ions Pb-Pb at $\sqrt {s_{NN}}
=$ 2.76 and 5.02 TeV along with Xe-Xe at $\sqrt {s_{NN}} = $ 5.44 TeV have been
analyzed. The initial temperature is extracted both in low and high
multiplicity events in ${\it pp}$ collisions. For $A-A$ collisions the
temperature is obtained as a function of centrality.
A universal scaling in the temperature from $pp$ and $A-A$ collisions is
obtained when multiplicity is scaled by the transverse interaction area.From
the measured energy density $\bm \varepsilon$ and the temperature the
dimensionless quantity $\bm \varepsilon/T^{4}$ is obtained. Our results for
Pb-Pb and Xe-Xe collisions show a sharp increase in $\bm \varepsilon/T^{4}$
above T $\sim$ 210 MeV and reaching the ideal gas of quarks and gluons value of
$\bm \varepsilon/T^{4} \sim$ 16 at temperature $\sim $ 230 MeV. In case of $pp$
collisions only $\bm \varepsilon/T^{4} \sim $ 10 corresponding to $\sim$ 30
degrees of freedom.
|
[
{
"created": "Thu, 24 Feb 2022 18:14:31 GMT",
"version": "v1"
},
{
"created": "Fri, 11 Mar 2022 17:08:44 GMT",
"version": "v2"
},
{
"created": "Mon, 21 Aug 2023 14:48:38 GMT",
"version": "v3"
}
] |
2024-04-26
|
[
[
"Mishra",
"Aditya Nath",
""
],
[
"Paić",
"Guy",
""
],
[
"Pajares",
"Carlos",
""
],
[
"Scharenberg",
"Rolf P",
""
],
[
"Srivastava",
"Brijesh K",
""
]
] |
In the present work we have analyzed the transverse momentum spectra of charged particles in high multiplicity ${\it pp}$ collisions at LHC energies $\sqrt s = $ 5.02 and 13 TeV published by the ALICE Collaboration using the Color String Percolation Model (CSPM). For heavy ions Pb-Pb at $\sqrt {s_{NN}} =$ 2.76 and 5.02 TeV along with Xe-Xe at $\sqrt {s_{NN}} = $ 5.44 TeV have been analyzed. The initial temperature is extracted both in low and high multiplicity events in ${\it pp}$ collisions. For $A-A$ collisions the temperature is obtained as a function of centrality. A universal scaling in the temperature from $pp$ and $A-A$ collisions is obtained when multiplicity is scaled by the transverse interaction area.From the measured energy density $\bm \varepsilon$ and the temperature the dimensionless quantity $\bm \varepsilon/T^{4}$ is obtained. Our results for Pb-Pb and Xe-Xe collisions show a sharp increase in $\bm \varepsilon/T^{4}$ above T $\sim$ 210 MeV and reaching the ideal gas of quarks and gluons value of $\bm \varepsilon/T^{4} \sim$ 16 at temperature $\sim $ 230 MeV. In case of $pp$ collisions only $\bm \varepsilon/T^{4} \sim $ 10 corresponding to $\sim$ 30 degrees of freedom.
|
1505.02646
|
Michael Trott
|
Christine Hartmann and Michael Trott
|
On one-loop corrections in the standard model effective field theory;
the $\Gamma(h \rightarrow \gamma \, \gamma)$ case
|
25 pages, 5 figures, v3: Acknowledgement updated with grant numbers
| null |
10.1007/JHEP07(2015)151
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We calculate one loop contributions to $\Gamma(h \rightarrow \gamma \,
\gamma)$ from higher dimensional operators, in the Standard Model Effective
Field Theory (SMEFT). Some technical challenges related to determining
Electroweak one loop "finite terms" are discussed and overcome. Although we
restrict our attention to $\Gamma(h \rightarrow \gamma \, \gamma)$, several
developments we report have broad implications. Firstly, the running of the
vacuum expectation value modifies the $\log(\mu)$ dependence of processes in a
manner that is not captured in some past SMEFT Renormalization Group (RG)
calculations. Secondly, higher dimensional operators can source ghost
interactions in $R_\xi$ gauges due to a modified gauge fixing procedure.
Lastly, higher dimensional operators can contribute with pure finite terms at
one loop in a manner that is not anticipated in a RG analysis. These results
cast recent speculation on the nature of one loop corrections in the SMEFT in
an entirely new light.
|
[
{
"created": "Mon, 11 May 2015 14:47:22 GMT",
"version": "v1"
},
{
"created": "Thu, 20 Aug 2015 17:22:53 GMT",
"version": "v2"
},
{
"created": "Tue, 11 Jul 2017 12:19:45 GMT",
"version": "v3"
}
] |
2017-07-12
|
[
[
"Hartmann",
"Christine",
""
],
[
"Trott",
"Michael",
""
]
] |
We calculate one loop contributions to $\Gamma(h \rightarrow \gamma \, \gamma)$ from higher dimensional operators, in the Standard Model Effective Field Theory (SMEFT). Some technical challenges related to determining Electroweak one loop "finite terms" are discussed and overcome. Although we restrict our attention to $\Gamma(h \rightarrow \gamma \, \gamma)$, several developments we report have broad implications. Firstly, the running of the vacuum expectation value modifies the $\log(\mu)$ dependence of processes in a manner that is not captured in some past SMEFT Renormalization Group (RG) calculations. Secondly, higher dimensional operators can source ghost interactions in $R_\xi$ gauges due to a modified gauge fixing procedure. Lastly, higher dimensional operators can contribute with pure finite terms at one loop in a manner that is not anticipated in a RG analysis. These results cast recent speculation on the nature of one loop corrections in the SMEFT in an entirely new light.
|
hep-ph/0703210
|
Satoshi Mishima
|
Satoshi Mishima
|
Recent Developments in the PQCD Approach
|
4 pages, 4 figures; talk given at the 4th International Workshop on
the CKM Unitarity Triangle (CKM2006), Nagoya, Japan, Dec. 12-16, 2006
| null | null | null |
hep-ph
| null |
We review recent developments in the perturbative QCD approach to exclusive
hadronic B meson decays. We discuss the important next-to-leading-order
corrections to B -> pi K, pi pi, and the penguin-dominated B -> PV modes, where
P (V) is a pseudo-scalar (vector) meson.
|
[
{
"created": "Mon, 19 Mar 2007 22:08:19 GMT",
"version": "v1"
}
] |
2007-05-23
|
[
[
"Mishima",
"Satoshi",
""
]
] |
We review recent developments in the perturbative QCD approach to exclusive hadronic B meson decays. We discuss the important next-to-leading-order corrections to B -> pi K, pi pi, and the penguin-dominated B -> PV modes, where P (V) is a pseudo-scalar (vector) meson.
|
hep-ph/9706304
|
Gregory D. Mahlon
|
Gregory Mahlon (U. Mich.) and Stephen Parke (Fermilab)
|
Maximizing Spin Correlations in Top Quark Pair Production at the
Tevatron
|
15 pages, revtex. 4 Postscript figures (included)
|
Phys.Lett. B411 (1997) 173-179
|
10.1016/S0370-2693(97)00987-8
|
Fermilab-Pub-97/185-T, UM-TH-97-09
|
hep-ph
| null |
A comparison is made between the off-diagonal and helicity spin bases for top
quark pair production at the FNAL Tevatron. In the off-diagonal basis, 92% of
the top quark pairs are in the spin configuration up-down plus down-up, whereas
in the helicity basis only 70% are left-right plus right-left. The off-diagonal
basis maximizes the spin asymmetry and hence the measured angular correlations
between the decay products, which are more than twice as big in this basis as
compared to the helicity basis. In addition, for the process q qbar --> t tbar,
we give a very simple analytic expression for the matrix element squared which
includes all spin correlations between the production and subsequent decay of
the top quarks.
|
[
{
"created": "Mon, 9 Jun 1997 19:42:45 GMT",
"version": "v1"
}
] |
2016-09-06
|
[
[
"Mahlon",
"Gregory",
"",
"U. Mich."
],
[
"Parke",
"Stephen",
"",
"Fermilab"
]
] |
A comparison is made between the off-diagonal and helicity spin bases for top quark pair production at the FNAL Tevatron. In the off-diagonal basis, 92% of the top quark pairs are in the spin configuration up-down plus down-up, whereas in the helicity basis only 70% are left-right plus right-left. The off-diagonal basis maximizes the spin asymmetry and hence the measured angular correlations between the decay products, which are more than twice as big in this basis as compared to the helicity basis. In addition, for the process q qbar --> t tbar, we give a very simple analytic expression for the matrix element squared which includes all spin correlations between the production and subsequent decay of the top quarks.
|
0803.0883
|
Peter Richardson
|
M. Bahr, S. Gieseke, M. A. Gigg, D. Grellscheid, K. Hamilton, O.
Latunde-Dada, S. Platzer, P. Richardson, M. H. Seymour, A. Sherstnev, J.
Tully, B. R. Webber
|
Herwig++ Physics and Manual
|
153 pages, program and additional information available from
http://projects.hepforge.org/herwig . Updated description to Herwig++ version
2.3 and added one author
|
Eur.Phys.J.C58:639-707,2008
|
10.1140/epjc/s10052-008-0798-9
|
CERN-PH-TH/2008-038 Cavendish-HEP-08/03 KA-TP-05-2008 DCPT/08/22
IPPP/08/11 CP3-08-05
|
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
In this paper we describe Herwig++ version 2.3, a general-purpose Monte Carlo
event generator for the simulation of hard lepton-lepton, lepton-hadron and
hadron-hadron collisions. A number of important hard scattering processes are
available, together with an interface via the Les Houches Accord to specialized
matrix element generators for additional processes. The simulation of Beyond
the Standard Model (BSM) physics includes a range of models and allows new
models to be added by encoding the Feynman rules of the model. The
parton-shower approach is used to simulate initial- and final-state QCD
radiation, including colour coherence effects, with special emphasis on the
correct description of radiation from heavy particles. The underlying event is
simulated using an eikonal multiple parton-parton scattering model. The
formation of hadrons from the quarks and gluons produced in the parton shower
is described using the cluster hadronization model. Hadron decays are simulated
using matrix elements, where possible including spin correlations and off-shell
effects.
|
[
{
"created": "Thu, 6 Mar 2008 15:33:25 GMT",
"version": "v1"
},
{
"created": "Thu, 17 Jul 2008 15:26:52 GMT",
"version": "v2"
},
{
"created": "Tue, 2 Dec 2008 15:40:32 GMT",
"version": "v3"
}
] |
2009-09-29
|
[
[
"Bahr",
"M.",
""
],
[
"Gieseke",
"S.",
""
],
[
"Gigg",
"M. A.",
""
],
[
"Grellscheid",
"D.",
""
],
[
"Hamilton",
"K.",
""
],
[
"Latunde-Dada",
"O.",
""
],
[
"Platzer",
"S.",
""
],
[
"Richardson",
"P.",
""
],
[
"Seymour",
"M. H.",
""
],
[
"Sherstnev",
"A.",
""
],
[
"Tully",
"J.",
""
],
[
"Webber",
"B. R.",
""
]
] |
In this paper we describe Herwig++ version 2.3, a general-purpose Monte Carlo event generator for the simulation of hard lepton-lepton, lepton-hadron and hadron-hadron collisions. A number of important hard scattering processes are available, together with an interface via the Les Houches Accord to specialized matrix element generators for additional processes. The simulation of Beyond the Standard Model (BSM) physics includes a range of models and allows new models to be added by encoding the Feynman rules of the model. The parton-shower approach is used to simulate initial- and final-state QCD radiation, including colour coherence effects, with special emphasis on the correct description of radiation from heavy particles. The underlying event is simulated using an eikonal multiple parton-parton scattering model. The formation of hadrons from the quarks and gluons produced in the parton shower is described using the cluster hadronization model. Hadron decays are simulated using matrix elements, where possible including spin correlations and off-shell effects.
|
1906.09690
|
Jialun Ping
|
Yue Tan, Jialun Ping
|
X(3872) in an unquenched quark model
|
8 pages
|
Phys. Rev. D 100, 034022 (2019)
|
10.1103/PhysRevD.100.034022
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
In this paper, we calculate mass and probability fractions of meson-meson
components of $X(3872)$ in an unquenched quark model. Different from most of
other unquenched quark models, the quark pairs creation operator from $^3P_0$
is modified by considering effects of the created quark pair energy and
separation between the created quark pair and the valence quark-pair. In the
calculation, all the wavefunctions of mesons and the relative motion between
two mesons are obtained by solving the corresponding Schr\"{o}dinger equation
with the help of gaussian expansion method. The multi-channel coupling of
quark-antiquark state with possible meson-meson states are performed. The
results show that the $X(3872)$ can be described as a mixing state of dominant
charmonium state (70\%) and meson-meson components (30\%).
|
[
{
"created": "Mon, 24 Jun 2019 02:06:54 GMT",
"version": "v1"
},
{
"created": "Thu, 4 Jul 2019 13:39:15 GMT",
"version": "v2"
}
] |
2019-08-28
|
[
[
"Tan",
"Yue",
""
],
[
"Ping",
"Jialun",
""
]
] |
In this paper, we calculate mass and probability fractions of meson-meson components of $X(3872)$ in an unquenched quark model. Different from most of other unquenched quark models, the quark pairs creation operator from $^3P_0$ is modified by considering effects of the created quark pair energy and separation between the created quark pair and the valence quark-pair. In the calculation, all the wavefunctions of mesons and the relative motion between two mesons are obtained by solving the corresponding Schr\"{o}dinger equation with the help of gaussian expansion method. The multi-channel coupling of quark-antiquark state with possible meson-meson states are performed. The results show that the $X(3872)$ can be described as a mixing state of dominant charmonium state (70\%) and meson-meson components (30\%).
|
hep-ph/9302226
| null |
S. G. Naculich and C.-P. Yuan
|
Inelastic Channels in WW Scattering
|
phyzzx, 13 pp. plus 4 figures, JHU-TIPAC-930005, MSUHEP-93/02
|
Phys.Rev.D48:1097-1103,1993
|
10.1103/PhysRevD.48.1097
| null |
hep-ph
| null |
If the electroweak symmetry-breaking sector becomes strongly interacting at
high energies, it can be probed through longitudinal $W$ scattering. We present
a model with many inelastic channels in the $W_L W_L$ scattering process,
corresponding to the production of heavy fermion pairs. These heavy fermions
affect the elastic scattering of $W_L$'s by propagating in loops, greatly
reducing the amplitudes in some charge channels. We conclude that the
symmetry-breaking sector cannot be fully explored by using, for example, the
$W_L^\pm W_L^\pm$ mode alone, even when no resonance is present; all $W_L W_L
\to W_L W_L$ scattering modes must be measured.
|
[
{
"created": "Fri, 5 Feb 1993 19:03:08 GMT",
"version": "v1"
}
] |
2008-11-26
|
[
[
"Naculich",
"S. G.",
""
],
[
"Yuan",
"C. -P.",
""
]
] |
If the electroweak symmetry-breaking sector becomes strongly interacting at high energies, it can be probed through longitudinal $W$ scattering. We present a model with many inelastic channels in the $W_L W_L$ scattering process, corresponding to the production of heavy fermion pairs. These heavy fermions affect the elastic scattering of $W_L$'s by propagating in loops, greatly reducing the amplitudes in some charge channels. We conclude that the symmetry-breaking sector cannot be fully explored by using, for example, the $W_L^\pm W_L^\pm$ mode alone, even when no resonance is present; all $W_L W_L \to W_L W_L$ scattering modes must be measured.
|
2306.02138
|
Jiabao Zhang
|
Chao-Qiang Geng, Chia-Wei Liu and Jiabao Zhang
|
Isospin violating decays of vector charmonia
|
15 pages, 3 figures
|
Eur. Phys. J. C 83, 973 (2023)
|
10.1140/epjc/s10052-023-12099-1
| null |
hep-ph hep-ex
|
http://creativecommons.org/licenses/by/4.0/
|
We study the isospin violating decays of vector charmonia to
$\Lambda\overline{\Sigma}^0$ and its charge conjugate. They are dominated by
the single photon annihilation and can be evaluated reliably with timelike form
factors. We utilize the quark-pair creation model, which is valid for the OZI
suppressed decays, to evaluate the form factors. We obtain the branching
fractions of ${\cal
B}(J/\psi\to\Lambda\overline{\Sigma}^0+c.c.)=(2.4\pm0.4)\times10^{-5}$ and
${\cal
B}(\psi(2S)\to\Lambda\overline{\Sigma}^0+c.c.)=(3.0\pm0.5)\times10^{-6}$, which
are compatible with the measurements by the BESIII collaborations,
respectively. The decay asymmetries are found to be $\alpha_{J/\psi}=0.314$ and
$\alpha_{\psi(2S)}=0.461$, which can be examined at BESIII in the foreseeable
future.
|
[
{
"created": "Sat, 3 Jun 2023 15:37:08 GMT",
"version": "v1"
},
{
"created": "Sat, 15 Jul 2023 02:56:34 GMT",
"version": "v2"
},
{
"created": "Mon, 30 Oct 2023 04:08:29 GMT",
"version": "v3"
}
] |
2023-10-31
|
[
[
"Geng",
"Chao-Qiang",
""
],
[
"Liu",
"Chia-Wei",
""
],
[
"Zhang",
"Jiabao",
""
]
] |
We study the isospin violating decays of vector charmonia to $\Lambda\overline{\Sigma}^0$ and its charge conjugate. They are dominated by the single photon annihilation and can be evaluated reliably with timelike form factors. We utilize the quark-pair creation model, which is valid for the OZI suppressed decays, to evaluate the form factors. We obtain the branching fractions of ${\cal B}(J/\psi\to\Lambda\overline{\Sigma}^0+c.c.)=(2.4\pm0.4)\times10^{-5}$ and ${\cal B}(\psi(2S)\to\Lambda\overline{\Sigma}^0+c.c.)=(3.0\pm0.5)\times10^{-6}$, which are compatible with the measurements by the BESIII collaborations, respectively. The decay asymmetries are found to be $\alpha_{J/\psi}=0.314$ and $\alpha_{\psi(2S)}=0.461$, which can be examined at BESIII in the foreseeable future.
|
1704.04495
|
Sourendu Gupta
|
Sourendu Gupta and Rishi Sharma
|
Effective Field Theory Models for Thermal QCD
|
Proceedings of Quark Matter 2017
| null |
10.1016/j.nuclphysa.2017.04.036
| null |
hep-ph hep-lat hep-th nucl-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We present an effective field theory model for QCD at finite temperature with
quarks. We discuss the mean field theory, the fixing of parameters, and a
prediction for the curvature of the critical line. We proceed to write down a
pionic theory of fluctuations around the mean field, and discuss how the
parameters of this pionic effective theory descend from the model with quarks.
|
[
{
"created": "Fri, 14 Apr 2017 17:48:42 GMT",
"version": "v1"
}
] |
2018-03-14
|
[
[
"Gupta",
"Sourendu",
""
],
[
"Sharma",
"Rishi",
""
]
] |
We present an effective field theory model for QCD at finite temperature with quarks. We discuss the mean field theory, the fixing of parameters, and a prediction for the curvature of the critical line. We proceed to write down a pionic theory of fluctuations around the mean field, and discuss how the parameters of this pionic effective theory descend from the model with quarks.
|
1212.1500
|
Roman Buniy
|
Roman V. Buniy, Jason Cantarella, Thomas W. Kephart, and Eric Rawdon
|
The tight knot spectrum in QCD
|
30 pages, 17 figures, 7 tables
|
Phys. Rev. D 89, 054513 (2014)
|
10.1103/PhysRevD.89.054513
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We model the observed $J^{++}$ mesonic mass spectrum in terms of energies for
tightly knotted and linked chromoelectric QCD flux tubes. The data is fit with
one and two parameter models. We predict a possible new state at approximately
1190 MeV and a plethora of new states above 1690 MeV.
|
[
{
"created": "Thu, 6 Dec 2012 23:16:59 GMT",
"version": "v1"
}
] |
2014-04-08
|
[
[
"Buniy",
"Roman V.",
""
],
[
"Cantarella",
"Jason",
""
],
[
"Kephart",
"Thomas W.",
""
],
[
"Rawdon",
"Eric",
""
]
] |
We model the observed $J^{++}$ mesonic mass spectrum in terms of energies for tightly knotted and linked chromoelectric QCD flux tubes. The data is fit with one and two parameter models. We predict a possible new state at approximately 1190 MeV and a plethora of new states above 1690 MeV.
|
hep-ph/9608245
|
Thomas Binoth
|
T. Binoth and J.J. van der Bij (University of Freiburg, FRG)
|
Influence of strongly coupled, hidden scalars on Higgs signals
|
22 pages, Latex, 12 figures embedded with epsf.sty and epsfig.sty, to
appear in Z. Phys. C
|
Z.Phys.C75:17-25,1997
|
10.1007/s002880050442
|
Freiburg-THEP 96/15
|
hep-ph
| null |
To investigate the possible effects of a light hidden sector on Higgs boson
detection, we discuss a model of scalar singlets coupled to the Standard Model.
The model effectively makes the Higgs width a free parameter due to additional
invisible decay modes. This width can become arbitrarily large. Theoretical and
experimental bounds on model parameters are presented. It is shown, how
Standard Model predictions change and that in the case of large coupling, Higgs
signals will be diluted. We study, to which extent such a strongly coupled,
hidden sector can be excluded by present and future Higgs search experiments.
|
[
{
"created": "Tue, 6 Aug 1996 17:37:33 GMT",
"version": "v1"
}
] |
2011-09-29
|
[
[
"Binoth",
"T.",
"",
"University of Freiburg, FRG"
],
[
"van der Bij",
"J. J.",
"",
"University of Freiburg, FRG"
]
] |
To investigate the possible effects of a light hidden sector on Higgs boson detection, we discuss a model of scalar singlets coupled to the Standard Model. The model effectively makes the Higgs width a free parameter due to additional invisible decay modes. This width can become arbitrarily large. Theoretical and experimental bounds on model parameters are presented. It is shown, how Standard Model predictions change and that in the case of large coupling, Higgs signals will be diluted. We study, to which extent such a strongly coupled, hidden sector can be excluded by present and future Higgs search experiments.
|
1705.03906
|
Ariel Arza
|
Ariel Arza
|
Effects of Weakly Interacting Slim Particles in Cavities with a Moving
Boundary Condition
|
The paper has not been accepted
| null | null | null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We study a Light Shinning Through the wall type setup with microwave
cavities, where the regeneration cavity has a moving boundary condition
oscillating harmonically. We find a parametric resonance that could enhance the
probability conversion between Weakly Interacting Slim Particles and photons by
several orders of magnitude.
|
[
{
"created": "Wed, 10 May 2017 18:13:00 GMT",
"version": "v1"
},
{
"created": "Sun, 6 May 2018 06:36:59 GMT",
"version": "v2"
}
] |
2018-05-08
|
[
[
"Arza",
"Ariel",
""
]
] |
We study a Light Shinning Through the wall type setup with microwave cavities, where the regeneration cavity has a moving boundary condition oscillating harmonically. We find a parametric resonance that could enhance the probability conversion between Weakly Interacting Slim Particles and photons by several orders of magnitude.
|
1404.0819
|
Rizos John
|
J. Rizos (University of Ioannina)
|
Top quark mass coupling and classification of weakly-coupled heterotic
superstring vacua
|
13 pages, 1 figure, minor changes, to be published in The European
Physical Journal C
| null |
10.1140/epjc/s10052-014-2905-4
| null |
hep-ph hep-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
The quest for the Standard Model among the huge number of string vacua is
usually based on a set of phenomenological criteria related to the massless
spectrum of string models. In this work we study criteria associated with
interactions in the effective low energy theory and in particular with the
presence of the coupling that provides mass to the top quark. Working in the
context of the Free Fermionic Formulation of the heterotic superstring, we
demonstrate that, in a big class of phenomenologically promising $Z_2\times
Z_2$ compactifications, these criteria can be expressed entirely in terms of
the generalised GSO projection coefficients entering the definition of the
models. They are shown to be very efficient in identifying phenomenologically
viable vacua, especially in the framework of computer-based search, as they are
met by approximately one every $10^4$ models. We apply our results in the
investigation of a class of supersymmetric Pati-Salam vacua, comprising
$10^{16}$ configurations, and show that when combined with other
phenomenological requirements they lead to a relatively small set of about
$10^7$ Standard Model compatible models that can be fully classified.
|
[
{
"created": "Thu, 3 Apr 2014 09:59:19 GMT",
"version": "v1"
},
{
"created": "Sun, 25 May 2014 14:44:13 GMT",
"version": "v2"
}
] |
2015-06-19
|
[
[
"Rizos",
"J.",
"",
"University of Ioannina"
]
] |
The quest for the Standard Model among the huge number of string vacua is usually based on a set of phenomenological criteria related to the massless spectrum of string models. In this work we study criteria associated with interactions in the effective low energy theory and in particular with the presence of the coupling that provides mass to the top quark. Working in the context of the Free Fermionic Formulation of the heterotic superstring, we demonstrate that, in a big class of phenomenologically promising $Z_2\times Z_2$ compactifications, these criteria can be expressed entirely in terms of the generalised GSO projection coefficients entering the definition of the models. They are shown to be very efficient in identifying phenomenologically viable vacua, especially in the framework of computer-based search, as they are met by approximately one every $10^4$ models. We apply our results in the investigation of a class of supersymmetric Pati-Salam vacua, comprising $10^{16}$ configurations, and show that when combined with other phenomenological requirements they lead to a relatively small set of about $10^7$ Standard Model compatible models that can be fully classified.
|
hep-ph/9511340
|
Alexei Novikov
|
H.B.Nielsen, A.V.Novikov, V.A.Novikov, M.I.Vysotsky
|
Higgs potential bounds on extra quark-lepton generations
|
7pp, LaTeX, uses epsf, 5 figures, PS file available at
http://venus.itep.ru/preprints/1995/95058.ps.gz
|
Phys.Lett. B374 (1996) 127-130
|
10.1016/0370-2693(96)00180-3
|
ITEP 58-95
|
hep-ph
| null |
We consider the bounds for the values of higgs mass $M_H$ and of the mass of
the extra quarks and leptons $M_{extra}$ derived from the stability of vacuum
and from the absence of Landau pole in Higgs potential. We find that in the
case of the absence of new physics up to the GUT scale the bounds for the mass
of the 4th generation are so restrictive that the negative result of CDF search
for extra quarks closes the window for fourth generation. In the case of the
absence of new physics up to $10^5$ GeV we get weaker but still nontrivial
bounds on $M_H$ and $M_{extra}$ as well.
|
[
{
"created": "Thu, 16 Nov 1995 14:06:07 GMT",
"version": "v1"
}
] |
2009-10-28
|
[
[
"Nielsen",
"H. B.",
""
],
[
"Novikov",
"A. V.",
""
],
[
"Novikov",
"V. A.",
""
],
[
"Vysotsky",
"M. I.",
""
]
] |
We consider the bounds for the values of higgs mass $M_H$ and of the mass of the extra quarks and leptons $M_{extra}$ derived from the stability of vacuum and from the absence of Landau pole in Higgs potential. We find that in the case of the absence of new physics up to the GUT scale the bounds for the mass of the 4th generation are so restrictive that the negative result of CDF search for extra quarks closes the window for fourth generation. In the case of the absence of new physics up to $10^5$ GeV we get weaker but still nontrivial bounds on $M_H$ and $M_{extra}$ as well.
|
hep-ph/9305263
|
Tom Gould
|
Thomas M. Gould and Erich R. Poppitz
|
Semiclassical Scattering in Yang-Mills Theory
|
JHU-TIPAC-930012, 34 pgs., (LaTeX, one uuencoded figure)
|
Nucl.Phys.B418:131-156,1994
|
10.1016/0550-3213(94)90241-0
| null |
hep-ph hep-th
| null |
A classical solution to the Yang-Mills theory is given a new semiclassical
interpretation. The boundary value problem on a complex time contour which
arises from the semiclassical approximation to multiparticle scattering
amplitudes is reviewed and applied to the case of Yang- Mills theory. The
solution describes a classically for- bidden transition between states with a
large average number of particles in the limit $g\rightarrow 0$. It dominates a
transition probability with a semiclassical suppression factor equal to twice
the action of the well- known BPST instanton. Hence, it is relevant to the pro-
blem of high energy tunnelling. It describes transitions of unit topological
charge for an appropriate time contour. Therefore, it may have a direct
interpretation in terms of fermion number violating processes in electroweak
theory. The solution describes a transition between an initial state with
parametrically fewer particles than the final state. Thus, it may be relevant
to the study of semiclassical initial state corrections in the limit of a small
number of initial particles. The implications of these results for
multiparticle production in electroweak theory are also discussed.
|
[
{
"created": "Thu, 13 May 1993 20:20:51 GMT",
"version": "v1"
}
] |
2010-11-01
|
[
[
"Gould",
"Thomas M.",
""
],
[
"Poppitz",
"Erich R.",
""
]
] |
A classical solution to the Yang-Mills theory is given a new semiclassical interpretation. The boundary value problem on a complex time contour which arises from the semiclassical approximation to multiparticle scattering amplitudes is reviewed and applied to the case of Yang- Mills theory. The solution describes a classically for- bidden transition between states with a large average number of particles in the limit $g\rightarrow 0$. It dominates a transition probability with a semiclassical suppression factor equal to twice the action of the well- known BPST instanton. Hence, it is relevant to the pro- blem of high energy tunnelling. It describes transitions of unit topological charge for an appropriate time contour. Therefore, it may have a direct interpretation in terms of fermion number violating processes in electroweak theory. The solution describes a transition between an initial state with parametrically fewer particles than the final state. Thus, it may be relevant to the study of semiclassical initial state corrections in the limit of a small number of initial particles. The implications of these results for multiparticle production in electroweak theory are also discussed.
|
0903.1330
|
Nestor Armesto
|
N. Armesto
|
Predictions for the heavy-ion programme at the Large Hadron Collider
|
64 pages, 40 figures, 7 tables; invited review for "Quark-Gluon
Plasma 4"; v2: small changes, some predictions and references added, final
version
| null |
10.1142/9789814293297_0007
| null |
hep-ph hep-ex nucl-ex nucl-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
I review the main predictions for the heavy-ion programme at the Large Hadron
Collider (LHC) at CERN, as available in early April 2009. I begin by
remembering the standard claims made in view of the experimental data measured
at the Super Proton Synchrotron (SPS) at CERN and at the Relativistic Heavy Ion
Collider (RHIC) at the BNL. These claims will be used for later discussion of
the new opportunities at the LHC. Next I review the generic, qualitative
expectations for the LHC. Then I turn to quantitative predictions: First I
analyze observables which characterize directly the medium produced in the
collisions - bulk observables or soft probes -: multiplicities, collective
flow, hadrochemistry at low transverse momentum, correlations and fluctuations.
Second, I move to calibrated probes of the medium i.e. typically those whose
expectation in the absence of any medium can be described in Quantum
Chromodynamics (QCD) using perturbative techniques (pQCD), usually called hard
probes. I discuss particle production at large transverse momentum and jets,
heavy-quark and quarkonium production, and photons and dileptons. Finally,
after a brief review of pA collisions, I end with a summary and a discussion
about the potentiality of the measurements at the LHC - particularly those made
during the first run - to further substantiate or, on the contrary, disproof
the picture of the medium that has arisen from the confrontation between the
SPS and RHIC data, and theoretical models.
|
[
{
"created": "Mon, 9 Mar 2009 09:48:58 GMT",
"version": "v1"
},
{
"created": "Thu, 1 Jul 2010 15:28:04 GMT",
"version": "v2"
}
] |
2016-12-21
|
[
[
"Armesto",
"N.",
""
]
] |
I review the main predictions for the heavy-ion programme at the Large Hadron Collider (LHC) at CERN, as available in early April 2009. I begin by remembering the standard claims made in view of the experimental data measured at the Super Proton Synchrotron (SPS) at CERN and at the Relativistic Heavy Ion Collider (RHIC) at the BNL. These claims will be used for later discussion of the new opportunities at the LHC. Next I review the generic, qualitative expectations for the LHC. Then I turn to quantitative predictions: First I analyze observables which characterize directly the medium produced in the collisions - bulk observables or soft probes -: multiplicities, collective flow, hadrochemistry at low transverse momentum, correlations and fluctuations. Second, I move to calibrated probes of the medium i.e. typically those whose expectation in the absence of any medium can be described in Quantum Chromodynamics (QCD) using perturbative techniques (pQCD), usually called hard probes. I discuss particle production at large transverse momentum and jets, heavy-quark and quarkonium production, and photons and dileptons. Finally, after a brief review of pA collisions, I end with a summary and a discussion about the potentiality of the measurements at the LHC - particularly those made during the first run - to further substantiate or, on the contrary, disproof the picture of the medium that has arisen from the confrontation between the SPS and RHIC data, and theoretical models.
|
0908.3145
|
Stanislaw Tatur
|
J. Bartelski, S. Tatur
|
Magnetic moments of octet baryons, angular momenta of quarks and sea
antiquark polarizations
|
14 pages, latex, 5 eps figures
|
Phys.Rev.D81:054013,2010
|
10.1103/PhysRevD.81.054013
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
One can determine antiquark polarizations in proton using the information
from deep inelastic scattering, $\beta$ decays of baryons, orbital angular
momenta of quarks, as well as their integrated magnetic distributions. The last
quantities were determined previously by us performing a fit to magnetic
moments of baryon octet. However, because of the SU(3) symmetry our results
depend on two parameters. The quantity $\Gamma_{V}$, measured recently in a
COMPASS experiment, gives the relation between these parameters. We can fix the
last unknown parameter using the ratio of up and down quark magnetic moments
which one can get from the fit to radiative vector meson decays. We calculate
antiquark polarizations with the orbital momenta of valence quarks that follow
from lattice calculations. The value of difference for up and down antiquark
polarizations obtained in our calculations is consistent with the result
obtained in a HERMES experiment.
|
[
{
"created": "Fri, 21 Aug 2009 15:11:45 GMT",
"version": "v1"
},
{
"created": "Fri, 12 Mar 2010 15:20:27 GMT",
"version": "v2"
}
] |
2015-03-13
|
[
[
"Bartelski",
"J.",
""
],
[
"Tatur",
"S.",
""
]
] |
One can determine antiquark polarizations in proton using the information from deep inelastic scattering, $\beta$ decays of baryons, orbital angular momenta of quarks, as well as their integrated magnetic distributions. The last quantities were determined previously by us performing a fit to magnetic moments of baryon octet. However, because of the SU(3) symmetry our results depend on two parameters. The quantity $\Gamma_{V}$, measured recently in a COMPASS experiment, gives the relation between these parameters. We can fix the last unknown parameter using the ratio of up and down quark magnetic moments which one can get from the fit to radiative vector meson decays. We calculate antiquark polarizations with the orbital momenta of valence quarks that follow from lattice calculations. The value of difference for up and down antiquark polarizations obtained in our calculations is consistent with the result obtained in a HERMES experiment.
|
2009.02315
|
Sichun Sun
|
Rong-Gen Cai, Sichun Sun, Bing Zhang, Yun-Long Zhang
|
Dark Fluxes from Accreting Black Holes and Direct Detections
|
10 pages, 4 figures. v2 the presentation reordered according to DM
masses; Xenon plot added; accepted version by EPJC
|
Eur. Phys. J. C 82, 245 (2022)
|
10.1140/epjc/s10052-022-10173-8
|
YITP-20-114
|
hep-ph astro-ph.HE gr-qc
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We discuss the possibility that accreting black hole systems can be sources
for dark matter flux through several different mechanisms. We firstly discuss
two types of systems: coronal thermal plasmas around supermassive black holes
in active galactic nuclei (AGNs), and accretion disks of stellar-mass X-ray
black hole binaries (BHBs). We explore how these black hole systems may produce
keV light dark matter fluxes and find that the dark fluxes from those sources
might be too weak to account for the current XENON1T excess. On the other hand,
black holes can be good accelerators to accrete and boost heavy dark matter
particles. If considering collisions or dark electromagnetism, those particles
can then escape and reach the benchmark speed of 0.1c at the detector. We also
extend the black hole mass region to primordial black holes (PBHs) and discuss
the possibility of contributing to keV light dark flux via superradiance of
PBHs.
|
[
{
"created": "Fri, 4 Sep 2020 17:44:09 GMT",
"version": "v1"
},
{
"created": "Tue, 22 Mar 2022 08:15:57 GMT",
"version": "v2"
}
] |
2022-03-25
|
[
[
"Cai",
"Rong-Gen",
""
],
[
"Sun",
"Sichun",
""
],
[
"Zhang",
"Bing",
""
],
[
"Zhang",
"Yun-Long",
""
]
] |
We discuss the possibility that accreting black hole systems can be sources for dark matter flux through several different mechanisms. We firstly discuss two types of systems: coronal thermal plasmas around supermassive black holes in active galactic nuclei (AGNs), and accretion disks of stellar-mass X-ray black hole binaries (BHBs). We explore how these black hole systems may produce keV light dark matter fluxes and find that the dark fluxes from those sources might be too weak to account for the current XENON1T excess. On the other hand, black holes can be good accelerators to accrete and boost heavy dark matter particles. If considering collisions or dark electromagnetism, those particles can then escape and reach the benchmark speed of 0.1c at the detector. We also extend the black hole mass region to primordial black holes (PBHs) and discuss the possibility of contributing to keV light dark flux via superradiance of PBHs.
|
2106.05674
|
Chuanxin Cui
|
Chuan-Xin Cui, Jin-Yang Li, Shinya Matsuzaki, Mamiya Kawaguchi, Akio
Tomiya
|
New interpretation of chiral phase transition: Violation of trilemma in
QCD
|
14 pages, 11 figures; version published in Phys.Rev.D
|
Phys. Rev. D, 105.114031 (2022)
|
10.1103/PhysRevD.105.114031
| null |
hep-ph hep-lat hep-th
|
http://creativecommons.org/licenses/by/4.0/
|
We find that the chiral phase transition (chiral crossover) in QCD at
physical point is triggered by big imbalance among three fundamental quantities
essential for the QCD vacuum structure: susceptibility functions for the chiral
symmetry, axial symmetry, and the topological charge. The balance, dobbed the
QCD trilemma, is unavoidably violated when one of the magnitudes among them is
highly dominated, or suppressed. Based on a three-flavor Nambu-Jona-Lasinio
model, we explicitly evaluate the amount of violation of the QCD trilemma at
physical point, and show that the violation takes place not only at vacuum, but
even in a whole temperature regime including the chiral crossover epoch. This
work confirms and extends the suggestion recently reported from lattice QCD
with 2 flavors on dominance of the axial and topological susceptibilities left
in the chiral susceptibility at high temperatures. It turns out that the
imbalance is essentially due to the flavor symmetry violation of the lightest
three flavors, and the flavor breaking specifically brings enhancement of the
axial anomaly contribution in the chiral order parameter, while the the
strength of the axial breaking and the transition rate of the topological
charge are fairly insensitive to the flavor symmetry. The violation of QCD
trilemma and its flavor dependence can be tested by lattice simulations with 2
+ 1 flavors in the future, and would also give a new guiding principle to
explore the flavor dependence of the chiral phase transition, such as the
Columbia plot, including possible extension with external fields.
|
[
{
"created": "Thu, 10 Jun 2021 11:44:12 GMT",
"version": "v1"
},
{
"created": "Fri, 17 Dec 2021 11:40:35 GMT",
"version": "v2"
},
{
"created": "Mon, 24 Jan 2022 09:57:57 GMT",
"version": "v3"
},
{
"created": "Fri, 17 Jun 2022 09:32:46 GMT",
"version": "v4"
}
] |
2022-06-22
|
[
[
"Cui",
"Chuan-Xin",
""
],
[
"Li",
"Jin-Yang",
""
],
[
"Matsuzaki",
"Shinya",
""
],
[
"Kawaguchi",
"Mamiya",
""
],
[
"Tomiya",
"Akio",
""
]
] |
We find that the chiral phase transition (chiral crossover) in QCD at physical point is triggered by big imbalance among three fundamental quantities essential for the QCD vacuum structure: susceptibility functions for the chiral symmetry, axial symmetry, and the topological charge. The balance, dobbed the QCD trilemma, is unavoidably violated when one of the magnitudes among them is highly dominated, or suppressed. Based on a three-flavor Nambu-Jona-Lasinio model, we explicitly evaluate the amount of violation of the QCD trilemma at physical point, and show that the violation takes place not only at vacuum, but even in a whole temperature regime including the chiral crossover epoch. This work confirms and extends the suggestion recently reported from lattice QCD with 2 flavors on dominance of the axial and topological susceptibilities left in the chiral susceptibility at high temperatures. It turns out that the imbalance is essentially due to the flavor symmetry violation of the lightest three flavors, and the flavor breaking specifically brings enhancement of the axial anomaly contribution in the chiral order parameter, while the the strength of the axial breaking and the transition rate of the topological charge are fairly insensitive to the flavor symmetry. The violation of QCD trilemma and its flavor dependence can be tested by lattice simulations with 2 + 1 flavors in the future, and would also give a new guiding principle to explore the flavor dependence of the chiral phase transition, such as the Columbia plot, including possible extension with external fields.
|
2111.05664
|
Xuangong Wang
|
A. W. Thomas, X. G. Wang, A. G. Williams
|
Constraints on the dark photon from deep inelastic scattering
|
5 pages, 1 figure, 2 tables
|
Phys. Rev. D 105 (2022) L031901
|
10.1103/PhysRevD.105.L031901
|
ADP-21-20/T1167
|
hep-ph hep-ex
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We investigate constraints on the dark photon arising from an analysis of
deep inelastic scattering (DIS) data. We perform extractions of parton
distribution functions (PDFs) with and without a dark photon being present and
allow the dark photon mixing parameter and mass to vary. We also include the
effects of vector meson dominance to ensure the correct photo-production limit.
By considering the variation of the total $\chi^2$ arising from such
extractions we infer exclusion limits on the kinetic mixing parameter of the
dark photon for dark photon mass up to $80\ {\rm GeV}$.
|
[
{
"created": "Wed, 10 Nov 2021 12:10:53 GMT",
"version": "v1"
},
{
"created": "Wed, 17 Nov 2021 03:27:33 GMT",
"version": "v2"
},
{
"created": "Sat, 5 Feb 2022 12:33:30 GMT",
"version": "v3"
}
] |
2022-02-08
|
[
[
"Thomas",
"A. W.",
""
],
[
"Wang",
"X. G.",
""
],
[
"Williams",
"A. G.",
""
]
] |
We investigate constraints on the dark photon arising from an analysis of deep inelastic scattering (DIS) data. We perform extractions of parton distribution functions (PDFs) with and without a dark photon being present and allow the dark photon mixing parameter and mass to vary. We also include the effects of vector meson dominance to ensure the correct photo-production limit. By considering the variation of the total $\chi^2$ arising from such extractions we infer exclusion limits on the kinetic mixing parameter of the dark photon for dark photon mass up to $80\ {\rm GeV}$.
|
2009.00411
|
Timo Schmidt
|
Ansgar Denner, Robert Franken, Mathieu Pellen, Timo Schmidt
|
NLO QCD and EW corrections to vector-boson scattering into ZZ at the LHC
|
28 pages, 45 pdf figures, matches the published version
|
JHEP 11 (2020) 110
|
10.1007/JHEP11(2020)110
|
Cavendish-HEP-20/11, VBSCAN-PUB-09-20
|
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We present the first calculation of the full next-to-leading-order
electroweak and QCD corrections for vector-boson scattering (VBS) into a pair
of Z bosons at the LHC. We consider specifically the process ${\rm pp\to
e^{+}e^{-}\mu^{+}\mu^{-}jj}+X$ at orders $\mathcal{O}(\alpha^7)$ and
$\mathcal{O}(\alpha_s\alpha^6)$ and take all off-shell and interference
contributions into account. Owing to the presence of enhanced Sudakov
logarithms, the electroweak corrections amount to $-16\%$ of the leading-order
electroweak fiducial cross section and induce significant shape distortions of
differential distributions. The QCD corrections on the other hand are larger
($+24\%$) than typical QCD corrections in VBS. This originates from considering
the full computation including tri-boson contributions in a rather inclusive
phase space. We also provide a leading-order analysis of all contributions to
the cross section for ${\rm pp \to e^{+}e^{-}\mu^{+}\mu^{-}jj}+X$ in a
realistic setup.
|
[
{
"created": "Tue, 1 Sep 2020 13:26:37 GMT",
"version": "v1"
},
{
"created": "Fri, 4 Dec 2020 08:36:23 GMT",
"version": "v2"
}
] |
2020-12-07
|
[
[
"Denner",
"Ansgar",
""
],
[
"Franken",
"Robert",
""
],
[
"Pellen",
"Mathieu",
""
],
[
"Schmidt",
"Timo",
""
]
] |
We present the first calculation of the full next-to-leading-order electroweak and QCD corrections for vector-boson scattering (VBS) into a pair of Z bosons at the LHC. We consider specifically the process ${\rm pp\to e^{+}e^{-}\mu^{+}\mu^{-}jj}+X$ at orders $\mathcal{O}(\alpha^7)$ and $\mathcal{O}(\alpha_s\alpha^6)$ and take all off-shell and interference contributions into account. Owing to the presence of enhanced Sudakov logarithms, the electroweak corrections amount to $-16\%$ of the leading-order electroweak fiducial cross section and induce significant shape distortions of differential distributions. The QCD corrections on the other hand are larger ($+24\%$) than typical QCD corrections in VBS. This originates from considering the full computation including tri-boson contributions in a rather inclusive phase space. We also provide a leading-order analysis of all contributions to the cross section for ${\rm pp \to e^{+}e^{-}\mu^{+}\mu^{-}jj}+X$ in a realistic setup.
|
1704.06529
|
Caroline Felix
|
D. Dudal, C. P. Felix, M. S. Guimaraes, S. P. Sorella
|
Accessing the topological susceptibility via the Gribov horizon
|
17 pages, 4 figures. v2: corrected typos, new figures, improved style
of presentation
|
Phys. Rev. D 96, 074036 (2017)
|
10.1103/PhysRevD.96.074036
| null |
hep-ph hep-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
The topological susceptibility, $\chi^4$, following the work of Witten and
Veneziano, plays a key role in identifying the relative magnitude of the
$\eta^{\prime}$ mass, the so-called $U(1)_{A}$ problem. A nonzero $\chi^4$ is
caused by the Veneziano ghost, the occurrence of an unphysical massless pole in
the correlation function of the topological current. In a recent paper
(Phys.Rev.Lett.114 (2015) 24, 242001), an explicit relationship between this
Veneziano ghost and color confinement was proposed, by connecting the dynamics
of the Veneziano ghost, and thus the topological susceptibility, with Gribov
copies. However, the analysis is incompatible with BRST symmetry (Phys.Rev.D 93
(2016) no.8, 085010). In this paper, we investigate the topological
susceptibility, $\chi^4$, in SU(3) and SU(2) Euclidean Yang-Mills theory using
an appropriate Pad\'e approximation tool and a non-perturbative gluon
propagator, within a BRST invariant framework and by taking into account Gribov
copies in a general linear covariant gauge.
|
[
{
"created": "Fri, 21 Apr 2017 13:23:47 GMT",
"version": "v1"
},
{
"created": "Mon, 28 Aug 2017 08:54:34 GMT",
"version": "v2"
}
] |
2017-11-08
|
[
[
"Dudal",
"D.",
""
],
[
"Felix",
"C. P.",
""
],
[
"Guimaraes",
"M. S.",
""
],
[
"Sorella",
"S. P.",
""
]
] |
The topological susceptibility, $\chi^4$, following the work of Witten and Veneziano, plays a key role in identifying the relative magnitude of the $\eta^{\prime}$ mass, the so-called $U(1)_{A}$ problem. A nonzero $\chi^4$ is caused by the Veneziano ghost, the occurrence of an unphysical massless pole in the correlation function of the topological current. In a recent paper (Phys.Rev.Lett.114 (2015) 24, 242001), an explicit relationship between this Veneziano ghost and color confinement was proposed, by connecting the dynamics of the Veneziano ghost, and thus the topological susceptibility, with Gribov copies. However, the analysis is incompatible with BRST symmetry (Phys.Rev.D 93 (2016) no.8, 085010). In this paper, we investigate the topological susceptibility, $\chi^4$, in SU(3) and SU(2) Euclidean Yang-Mills theory using an appropriate Pad\'e approximation tool and a non-perturbative gluon propagator, within a BRST invariant framework and by taking into account Gribov copies in a general linear covariant gauge.
|
hep-ph/9412313
| null |
Mauro Anselmino
|
Spin effects in strong interactions at high energy
|
Rapporteur talk at the XI International Symposium on High Energy Spin
Physics, September 15-22, Bloomington, Indiana, to be published in the
Proceedings. Latex file, 9 pages, no figure
|
AIPConf.Proc.343:345-353,1995
| null |
DFTT 65/94
|
hep-ph
| null |
Spin effects in strong interaction high energy processes are subtle phenomena
which involve both short and long distance physics and test perturbative and
non perturbative aspects of QCD. Moreover, depending on quantities like
interferences between different amplitudes and relative phases, spin
observables always test a theory at a fundamental quantum mechanical level; it
is then no surprise that spin data are often difficult to accomodate within the
existing models. A report is made on the main issues and contributions
discussed in the parallel Session on the ``Strong interactions at high energy"
in this Conference.
|
[
{
"created": "Sat, 17 Dec 1994 08:52:45 GMT",
"version": "v1"
}
] |
2008-11-26
|
[
[
"Anselmino",
"Mauro",
""
]
] |
Spin effects in strong interaction high energy processes are subtle phenomena which involve both short and long distance physics and test perturbative and non perturbative aspects of QCD. Moreover, depending on quantities like interferences between different amplitudes and relative phases, spin observables always test a theory at a fundamental quantum mechanical level; it is then no surprise that spin data are often difficult to accomodate within the existing models. A report is made on the main issues and contributions discussed in the parallel Session on the ``Strong interactions at high energy" in this Conference.
|
2002.09401
|
Jacopo Ferretti
|
J. Ferretti, E. Santopinto, M. Naeem Anwar and Yu Lu
|
Quark structure of the $\chi_{\rm c}(3P)$ and $X(4274)$ resonances and
their strong and radiative decays
| null |
EPJC 80, 464 (2020)
|
10.1140/epjc/s10052-020-8032-5
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We calculate the masses of $\chi_{\rm c}(3P)$ states with threshold
corrections in a coupled-channel model. The model was recently applied to the
description of the properties of $\chi_{\rm c}(2P)$ and $\chi_{\rm b}(3P)$
multiplets [Phys.\ Lett.\ B {\bf 789}, 550 (2019)]. We also compute the
open-charm strong decay widths of the $\chi_{\rm c}(3P)$ states and their
radiative transitions. According to our predictions, the $\chi_{\rm c}(3P)$
states should be dominated by the charmonium core, but they may also show small
meson-meson components. The $X(4274)$ is interpreted as a $c \bar c$ $\chi_{\rm
c1}(3P)$ state. More informations on the other members of the $\chi_{\rm
c}(3P)$ multiplet, as well as a more rigorous analysis of the $X(4274)$'s decay
modes, are needed to provide further indications on the quark structure of the
previous resonance.
|
[
{
"created": "Fri, 21 Feb 2020 16:35:28 GMT",
"version": "v1"
},
{
"created": "Mon, 11 May 2020 08:58:59 GMT",
"version": "v2"
},
{
"created": "Wed, 27 May 2020 00:51:20 GMT",
"version": "v3"
}
] |
2020-05-28
|
[
[
"Ferretti",
"J.",
""
],
[
"Santopinto",
"E.",
""
],
[
"Anwar",
"M. Naeem",
""
],
[
"Lu",
"Yu",
""
]
] |
We calculate the masses of $\chi_{\rm c}(3P)$ states with threshold corrections in a coupled-channel model. The model was recently applied to the description of the properties of $\chi_{\rm c}(2P)$ and $\chi_{\rm b}(3P)$ multiplets [Phys.\ Lett.\ B {\bf 789}, 550 (2019)]. We also compute the open-charm strong decay widths of the $\chi_{\rm c}(3P)$ states and their radiative transitions. According to our predictions, the $\chi_{\rm c}(3P)$ states should be dominated by the charmonium core, but they may also show small meson-meson components. The $X(4274)$ is interpreted as a $c \bar c$ $\chi_{\rm c1}(3P)$ state. More informations on the other members of the $\chi_{\rm c}(3P)$ multiplet, as well as a more rigorous analysis of the $X(4274)$'s decay modes, are needed to provide further indications on the quark structure of the previous resonance.
|
0707.3650
|
HockSeng Goh
|
Hock-Seng Goh and Christopher A. Krenke
|
A Little Twin Higgs Model
|
7 pages, no figures
|
Phys.Rev.D76:115018,2007
|
10.1103/PhysRevD.76.115018
| null |
hep-ph
| null |
We present a twin Higgs model based on left-right symmetry with a tree level
quartic. This is made possible by extending the symmetry of the model to
include two Z_2 parities, each of which is sufficient to protect the Higgs from
getting a quadratically divergent mass squared. Although both parities are
broken explicitly, the symmetries that protect the Higgs from getting a
quadratically divergent mass are broken only collectively. The quadratic
divergences of the Higgs mass are thus still protected at one loop. We find
that the fine tuning in this model is reduced substantially compared to the
original left-right twin Higgs model. This mechanism can also be applied to the
mirror twin Higgs model to get a significant reduction of the fine tuning,
while keeping the mirror photon massless.
|
[
{
"created": "Wed, 25 Jul 2007 00:19:29 GMT",
"version": "v1"
}
] |
2008-11-26
|
[
[
"Goh",
"Hock-Seng",
""
],
[
"Krenke",
"Christopher A.",
""
]
] |
We present a twin Higgs model based on left-right symmetry with a tree level quartic. This is made possible by extending the symmetry of the model to include two Z_2 parities, each of which is sufficient to protect the Higgs from getting a quadratically divergent mass squared. Although both parities are broken explicitly, the symmetries that protect the Higgs from getting a quadratically divergent mass are broken only collectively. The quadratic divergences of the Higgs mass are thus still protected at one loop. We find that the fine tuning in this model is reduced substantially compared to the original left-right twin Higgs model. This mechanism can also be applied to the mirror twin Higgs model to get a significant reduction of the fine tuning, while keeping the mirror photon massless.
|
hep-ph/0602251
|
Vladimir Miransky
|
E.V. Gorbar, Michio Hashimoto, V.A. Miransky, I.A. Shovkovy
|
Collective excitations, instabilities, and ground state in dense quark
matter
|
Revtex, 5 pages, 4 figures, two figures and clarifications added, to
appear in PRD (Rapid Communications)
|
Phys.Rev. D73 (2006) 111502
|
10.1103/PhysRevD.73.111502
|
UWO-TH-06/2
|
hep-ph cond-mat.supr-con hep-th
| null |
We study the spectrum of light plasmons in the (gapped and gapless)
two-flavor color superconducting phases and its connection with the
chromomagnetic instabilities and the structure of the ground state. It is
revealed that the chromomagnetic instabilities in the 4-7th and 8th gluonic
channels correspond to two very different plasmon spectra. These spectra lead
us to the unequivocal conclusion about the existence of gluonic condensates
(some of which can be spatially inhomogeneous) in the ground state. We also
argue that spatially inhomogeneous gluonic condensates should exist in the
three-flavor quark matter with the values of the mass of strange quark
corresponding to the gapless color-flavor locked state.
|
[
{
"created": "Tue, 28 Feb 2006 19:16:32 GMT",
"version": "v1"
},
{
"created": "Tue, 30 May 2006 12:58:15 GMT",
"version": "v2"
}
] |
2007-05-23
|
[
[
"Gorbar",
"E. V.",
""
],
[
"Hashimoto",
"Michio",
""
],
[
"Miransky",
"V. A.",
""
],
[
"Shovkovy",
"I. A.",
""
]
] |
We study the spectrum of light plasmons in the (gapped and gapless) two-flavor color superconducting phases and its connection with the chromomagnetic instabilities and the structure of the ground state. It is revealed that the chromomagnetic instabilities in the 4-7th and 8th gluonic channels correspond to two very different plasmon spectra. These spectra lead us to the unequivocal conclusion about the existence of gluonic condensates (some of which can be spatially inhomogeneous) in the ground state. We also argue that spatially inhomogeneous gluonic condensates should exist in the three-flavor quark matter with the values of the mass of strange quark corresponding to the gapless color-flavor locked state.
|
1510.06039
|
Martin Hoferichter
|
Martin Hoferichter, Jacobo Ruiz de Elvira, Bastian Kubis, Ulf-G.
Mei{\ss}ner
|
Roy-Steiner-equation analysis of pion-nucleon scattering
|
101 pages, 28 figures; journal version
|
Phys. Rept. 625 (2016) 1-88
|
10.1016/j.physrep.2016.02.002
|
INT-PUB-15-050
|
hep-ph hep-lat nucl-ex nucl-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We review the structure of Roy-Steiner equations for pion-nucleon scattering,
the solution for the partial waves of the t-channel process $\pi\pi\to \bar N
N$, as well as the high-accuracy extraction of the pion-nucleon S-wave
scattering lengths from data on pionic hydrogen and deuterium. We then proceed
to construct solutions for the lowest partial waves of the s-channel process
$\pi N\to \pi N$ and demonstrate that accurate solutions can be found if the
scattering lengths are imposed as constraints. Detailed error estimates of all
input quantities in the solution procedure are performed and explicit
parameterizations for the resulting low-energy phase shifts as well as results
for subthreshold parameters and higher threshold parameters are presented.
Furthermore, we discuss the extraction of the pion-nucleon $\sigma$-term via
the Cheng-Dashen low-energy theorem, including the role of isospin-breaking
corrections, to obtain a precision determination consistent with all
constraints from analyticity, unitarity, crossing symmetry, and pionic-atom
data. We perform the matching to chiral perturbation theory in the subthreshold
region and detail the consequences for the chiral convergence of the threshold
parameters and the nucleon mass.
|
[
{
"created": "Tue, 20 Oct 2015 20:10:02 GMT",
"version": "v1"
},
{
"created": "Tue, 22 Mar 2016 16:48:28 GMT",
"version": "v2"
}
] |
2016-03-24
|
[
[
"Hoferichter",
"Martin",
""
],
[
"de Elvira",
"Jacobo Ruiz",
""
],
[
"Kubis",
"Bastian",
""
],
[
"Meißner",
"Ulf-G.",
""
]
] |
We review the structure of Roy-Steiner equations for pion-nucleon scattering, the solution for the partial waves of the t-channel process $\pi\pi\to \bar N N$, as well as the high-accuracy extraction of the pion-nucleon S-wave scattering lengths from data on pionic hydrogen and deuterium. We then proceed to construct solutions for the lowest partial waves of the s-channel process $\pi N\to \pi N$ and demonstrate that accurate solutions can be found if the scattering lengths are imposed as constraints. Detailed error estimates of all input quantities in the solution procedure are performed and explicit parameterizations for the resulting low-energy phase shifts as well as results for subthreshold parameters and higher threshold parameters are presented. Furthermore, we discuss the extraction of the pion-nucleon $\sigma$-term via the Cheng-Dashen low-energy theorem, including the role of isospin-breaking corrections, to obtain a precision determination consistent with all constraints from analyticity, unitarity, crossing symmetry, and pionic-atom data. We perform the matching to chiral perturbation theory in the subthreshold region and detail the consequences for the chiral convergence of the threshold parameters and the nucleon mass.
|
1612.06867
|
Doojin Kim
|
Doojin Kim, Jong-Chul Park, Seodong Shin
|
Dark Matter "Collider" from Inelastic Boosted Dark Matter
|
6 pages, 4 figures, 2 tables
|
Phys. Rev. Lett. 119, 161801 (2017)
|
10.1103/PhysRevLett.119.161801
|
CERN-TH-2016-258
|
hep-ph hep-ex
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We propose a novel dark matter (DM) detection strategy for the models with
non-minimal dark sector. The main ingredients in the underlying DM scenario are
a boosted DM particle and a heavier dark sector state. The relativistic DM
impinged on target material scatters off inelastically to the heavier state
which subsequently decays into DM along with lighter states including visible
(Standard Model) particles. The expected signal event, therefore, accompanies a
visible signature by the secondary cascade process associated with a recoiling
of the target particle, differing from the typical neutrino signal not
involving the secondary signature. We then discuss various kinematic features
followed by DM detection prospects at large volume neutrino detectors with a
model framework where a dark gauge boson is the mediator between the Standard
Model particles and DM.
|
[
{
"created": "Tue, 20 Dec 2016 21:00:03 GMT",
"version": "v1"
},
{
"created": "Thu, 20 Apr 2017 23:25:39 GMT",
"version": "v2"
}
] |
2017-10-25
|
[
[
"Kim",
"Doojin",
""
],
[
"Park",
"Jong-Chul",
""
],
[
"Shin",
"Seodong",
""
]
] |
We propose a novel dark matter (DM) detection strategy for the models with non-minimal dark sector. The main ingredients in the underlying DM scenario are a boosted DM particle and a heavier dark sector state. The relativistic DM impinged on target material scatters off inelastically to the heavier state which subsequently decays into DM along with lighter states including visible (Standard Model) particles. The expected signal event, therefore, accompanies a visible signature by the secondary cascade process associated with a recoiling of the target particle, differing from the typical neutrino signal not involving the secondary signature. We then discuss various kinematic features followed by DM detection prospects at large volume neutrino detectors with a model framework where a dark gauge boson is the mediator between the Standard Model particles and DM.
|
hep-ph/0510361
|
Luis Gonzalez-Mestres
|
Luis Gonzalez-Mestres (LAPP Annecy-le-Vieux, CNRS-IN2P3, France, UMR
5814 CNRS - Universite de Savoie)
|
On extrapolations below the Planck scale in models with Lorentz symmetry
violation (I)
|
12 pages, LaTex. This paper contains un updated version of part of
the material presented at the 35th COSPAR Scientific Assembly, Paris, France,
18 - 25 July 2004
| null | null | null |
hep-ph
| null |
Most current models of Lorentz symmetry violation (LSV) at the Planck scale
involve power-like extrapolations of the Lorentz-beaking term down to
accelerator and even much lower energies. It is therefore assumed that no
intermediate energy scale alters this behaviour. But this is not the only
possible scenario: a more sophisticate energy-dependence is possible, and would
even be natural, involving significant effective thresholds at intermediate
energies. Such thresholds may exist between the Planck scale and the highest
cosmic-ray energies, or between ultra-high cosmic-ray energies and the TeV
scale, leading to interesting scenarios. In many cases, experimental
predictions of LSV patterns can be dramatically modified and space experiments
become necessary irrespective of AUGER results. By combining both kinds of
experiments, future results of cosmic-ray observations will hopefully be able
to test, for a large family of models involving various patterns of
Planck-scale physics, the possible existence of an absolute local rest frame in
the real world.
|
[
{
"created": "Thu, 27 Oct 2005 15:06:00 GMT",
"version": "v1"
}
] |
2007-05-23
|
[
[
"Gonzalez-Mestres",
"Luis",
"",
"LAPP Annecy-le-Vieux, CNRS-IN2P3, France, UMR\n 5814 CNRS - Universite de Savoie"
]
] |
Most current models of Lorentz symmetry violation (LSV) at the Planck scale involve power-like extrapolations of the Lorentz-beaking term down to accelerator and even much lower energies. It is therefore assumed that no intermediate energy scale alters this behaviour. But this is not the only possible scenario: a more sophisticate energy-dependence is possible, and would even be natural, involving significant effective thresholds at intermediate energies. Such thresholds may exist between the Planck scale and the highest cosmic-ray energies, or between ultra-high cosmic-ray energies and the TeV scale, leading to interesting scenarios. In many cases, experimental predictions of LSV patterns can be dramatically modified and space experiments become necessary irrespective of AUGER results. By combining both kinds of experiments, future results of cosmic-ray observations will hopefully be able to test, for a large family of models involving various patterns of Planck-scale physics, the possible existence of an absolute local rest frame in the real world.
|
1912.07621
|
Gilberto Tetlalmatzi-Xolocotzi
|
Alexander Lenz, Gilberto Tetlalmatzi-Xolocotzi
|
Model-independent bounds on new physics effects in non-leptonic
tree-level decays of B-mesons
|
81 pages, 26 figures. Version published in JHEP
|
JHEP07(2020)177
|
10.1007/JHEP07(2020)177
|
IPPP/19/49, Nikhef-2019-054, SI-HEP-2019, P3H-19-044
|
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We present a considerably improved analysis of model-independent bounds on
new physics effects in non-leptonic tree-level decays of B-mesons. Our main
finding is that contributions of about $\pm 0.1 $ to the Wilson coefficient of
the colour-singlet operator $Q_2$ of the effective weak Hamiltonian and
contributions in the range of $\pm 0.5$ (both for real and imaginary part) to
$Q_1$ can currently not be excluded at the $90\%$ C.L.. Effects of such a size
can modify the direct experimental extraction of the CKM angle $\gamma$ by up
to $10^{\circ}$ and they could lead to an enhancement of the decay rate
difference $\Delta \Gamma_d$ of up to a factor of 5 over its SM value - a size
that could explain the D0 dimuon asymmetry. Future more precise measurements of
the semi-leptonic asymmetries $a_{sl}^q$ and the lifetime ratio $\tau (B_s) /
\tau (B_d)$ will allow to shrink the bounds on tree-level new physics effects
considerably. Due to significant improvements in the precision of the
non-perturbative input we update all SM predictions for the mixing obervables
in the course of this analysis, obtaining: $\Delta M_s = (18.77 \pm 0.86 ) \,
\mbox{ps}^{-1}$, $\Delta M_d = (0.543 \pm 0.029) \, \mbox{ps}^{-1}$, $\Delta
\Gamma_s = (9.1 \pm 1.3 ) \cdot 10^{-2} \, \mbox{ps}^{-1}$, $\Delta \Gamma_d =
(2.6 \pm 0.4 ) \cdot 10^{-3} \, \mbox{ps}^{-1}$, $a_{sl}^s = (2.06 \pm 0.18)
\cdot 10^{-5}$ and $a_{sl}^d = (-4.73 \pm 0.42) \cdot 10^{-4}$.
|
[
{
"created": "Mon, 16 Dec 2019 19:00:05 GMT",
"version": "v1"
},
{
"created": "Mon, 27 Jul 2020 08:26:45 GMT",
"version": "v2"
}
] |
2020-07-28
|
[
[
"Lenz",
"Alexander",
""
],
[
"Tetlalmatzi-Xolocotzi",
"Gilberto",
""
]
] |
We present a considerably improved analysis of model-independent bounds on new physics effects in non-leptonic tree-level decays of B-mesons. Our main finding is that contributions of about $\pm 0.1 $ to the Wilson coefficient of the colour-singlet operator $Q_2$ of the effective weak Hamiltonian and contributions in the range of $\pm 0.5$ (both for real and imaginary part) to $Q_1$ can currently not be excluded at the $90\%$ C.L.. Effects of such a size can modify the direct experimental extraction of the CKM angle $\gamma$ by up to $10^{\circ}$ and they could lead to an enhancement of the decay rate difference $\Delta \Gamma_d$ of up to a factor of 5 over its SM value - a size that could explain the D0 dimuon asymmetry. Future more precise measurements of the semi-leptonic asymmetries $a_{sl}^q$ and the lifetime ratio $\tau (B_s) / \tau (B_d)$ will allow to shrink the bounds on tree-level new physics effects considerably. Due to significant improvements in the precision of the non-perturbative input we update all SM predictions for the mixing obervables in the course of this analysis, obtaining: $\Delta M_s = (18.77 \pm 0.86 ) \, \mbox{ps}^{-1}$, $\Delta M_d = (0.543 \pm 0.029) \, \mbox{ps}^{-1}$, $\Delta \Gamma_s = (9.1 \pm 1.3 ) \cdot 10^{-2} \, \mbox{ps}^{-1}$, $\Delta \Gamma_d = (2.6 \pm 0.4 ) \cdot 10^{-3} \, \mbox{ps}^{-1}$, $a_{sl}^s = (2.06 \pm 0.18) \cdot 10^{-5}$ and $a_{sl}^d = (-4.73 \pm 0.42) \cdot 10^{-4}$.
|
1108.4748
|
A. Bashir
|
Adnan Bashir, Alfredo Raya, Saul Sanchez-Madrigal
|
Chiral Symmetry Breaking and Confinement Beyond Rainbow-Ladder
Truncation
|
8 pages, 6 figures
| null |
10.1103/PhysRevD.84.036013
| null |
hep-ph cond-mat.supr-con hep-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
A non-perturbative construction of the 3-point fermion-boson vertex which
obeys its Ward-Takahashi or Slavnov-Taylor identity, ensures the massless
fermion and boson propagators transform according to their local gauge
covariance relations, reproduces perturbation theory in the weak coupling
regime and provides a gauge independent description for dynamical chiral
symmetry breaking (DCSB) and confinement has been a long-standing goal in
physically relevant gauge theories such as quantum electrodynamics (QED) and
quantum chromodynamics (QCD). In this paper, we demonstrate that the same
simple and practical form of the vertex can achieve these objectives not only
in 4-dimensional quenched QED (qQED4) but also in its 3-dimensional counterpart
(qQED3). Employing this convenient form of the vertex \emph{ansatz} into the
Schwinger-Dyson equation (SDE) for the fermion propagator, we observe that it
renders the critical coupling in qQED4 markedly gauge independent in contrast
with the bare vertex and improves on the well-known Curtis-Pennington
construction. Furthermore, our proposal yields gauge independent order
parameters for confinement and DCSB in qQED3.
|
[
{
"created": "Wed, 24 Aug 2011 05:12:51 GMT",
"version": "v1"
}
] |
2015-05-30
|
[
[
"Bashir",
"Adnan",
""
],
[
"Raya",
"Alfredo",
""
],
[
"Sanchez-Madrigal",
"Saul",
""
]
] |
A non-perturbative construction of the 3-point fermion-boson vertex which obeys its Ward-Takahashi or Slavnov-Taylor identity, ensures the massless fermion and boson propagators transform according to their local gauge covariance relations, reproduces perturbation theory in the weak coupling regime and provides a gauge independent description for dynamical chiral symmetry breaking (DCSB) and confinement has been a long-standing goal in physically relevant gauge theories such as quantum electrodynamics (QED) and quantum chromodynamics (QCD). In this paper, we demonstrate that the same simple and practical form of the vertex can achieve these objectives not only in 4-dimensional quenched QED (qQED4) but also in its 3-dimensional counterpart (qQED3). Employing this convenient form of the vertex \emph{ansatz} into the Schwinger-Dyson equation (SDE) for the fermion propagator, we observe that it renders the critical coupling in qQED4 markedly gauge independent in contrast with the bare vertex and improves on the well-known Curtis-Pennington construction. Furthermore, our proposal yields gauge independent order parameters for confinement and DCSB in qQED3.
|
hep-ph/9808383
|
Tim
|
T.S.Evans
|
The Unique Derivative Expansion for Thermal Effective Actions
|
RevTeX, 4 pages, 3 Feynman diagrams as eps files. Talk given at TFT98
- the 5th Workshop on Thermal Field Theories and their applications,
Regensburg, Germany, 10th-14th August 1998
| null | null |
Imperial/TP/97-98/069
|
hep-ph
| null |
I show that there is a unique and well behaved derivative expansion of an
effective action at finite temperature. The result is true for all formalisms
including the popular Closed Time Path and Imaginary Time methods.
|
[
{
"created": "Fri, 21 Aug 1998 17:33:01 GMT",
"version": "v1"
},
{
"created": "Wed, 16 Sep 1998 19:50:20 GMT",
"version": "v2"
}
] |
2007-05-23
|
[
[
"Evans",
"T. S.",
""
]
] |
I show that there is a unique and well behaved derivative expansion of an effective action at finite temperature. The result is true for all formalisms including the popular Closed Time Path and Imaginary Time methods.
|
hep-ph/9408347
|
Marcello Lissia
|
S. Huang and M. Lissia
|
Dimensional Reduction for Fermions
|
5 pages using world_sci.sty, which is appended to the file. Full
postscript version available via anonymous ftp from
risc0.ca.infn.it:/pub/private/lissia/infnca-th-94-17.ps (192.84.132.4) To
appear in the Proceedings of the ``Workshop on Quantum Infrared Physics'',
Paris, France, 6-10 June 1994
| null | null |
INFNCA-TH-94-17
|
hep-ph hep-lat nucl-th
| null |
We generalize the concept of dimensional reduction to operators involving
fermion fields in high temperature field theories. It is found that the
ultraviolet behavior of the running coupling constant plays a crucial role. The
general concept is illustrated explicitly in the Gross-Neveu model.
|
[
{
"created": "Mon, 22 Aug 1994 18:38:42 GMT",
"version": "v1"
}
] |
2007-05-23
|
[
[
"Huang",
"S.",
""
],
[
"Lissia",
"M.",
""
]
] |
We generalize the concept of dimensional reduction to operators involving fermion fields in high temperature field theories. It is found that the ultraviolet behavior of the running coupling constant plays a crucial role. The general concept is illustrated explicitly in the Gross-Neveu model.
|
1511.05990
|
Zack Sullivan
|
Keith Pedersen and Zack Sullivan
|
Mu_x boosted-bottom-jet tagging and Z-prime boson searches
|
22 pgs., 7 figs, several references added
| null |
10.1103/PhysRevD.93.014014
|
IIT-CAPP-15-05
|
hep-ph hep-ex
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We present a new technique for tagging heavy-flavor jets with p_T > 500 GeV
called "mu_x tagging." Current track-based methods of b-jet tagging lose
efficiency and experience a large rise in fake rate in the boosted regime.
Using muons from B hadron decay, we combine angular information and jet
substructure to tag b jets, c jets, light jets, and "light-heavy" jets (those
containing B hadrons from gluon splitting). We find tagging efficiencies of
epsilon_b = 14%, epsilon_c = 6.5%, epsilon_{light-light} = 0.14%, and
epsilon_{light-heavy} = 0.5%, respectively, that are nearly independent of
transverse momentum at high energy. We demonstrate the usefulness of this new
scheme by examining the discovery potential for multi-TeV leptophobic Z-prime
bosons in the boosted-b-tagged dijet channel at the Large Hadron Collider.
|
[
{
"created": "Wed, 18 Nov 2015 21:37:23 GMT",
"version": "v1"
},
{
"created": "Tue, 22 Dec 2015 21:50:07 GMT",
"version": "v2"
}
] |
2016-02-17
|
[
[
"Pedersen",
"Keith",
""
],
[
"Sullivan",
"Zack",
""
]
] |
We present a new technique for tagging heavy-flavor jets with p_T > 500 GeV called "mu_x tagging." Current track-based methods of b-jet tagging lose efficiency and experience a large rise in fake rate in the boosted regime. Using muons from B hadron decay, we combine angular information and jet substructure to tag b jets, c jets, light jets, and "light-heavy" jets (those containing B hadrons from gluon splitting). We find tagging efficiencies of epsilon_b = 14%, epsilon_c = 6.5%, epsilon_{light-light} = 0.14%, and epsilon_{light-heavy} = 0.5%, respectively, that are nearly independent of transverse momentum at high energy. We demonstrate the usefulness of this new scheme by examining the discovery potential for multi-TeV leptophobic Z-prime bosons in the boosted-b-tagged dijet channel at the Large Hadron Collider.
|
1505.01865
|
Matthias Le Dall
|
Matthias Le Dall, Maxim Pospelov, Adam Ritz
|
Sensitivity to light weakly-coupled new physics at the precision
frontier
|
13 pages, 8 figures. v2: Minor changes. v3: References added -
published version
|
Phys. Rev. D 92, 016010 (2015)
|
10.1103/PhysRevD.92.016010
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Precision measurements of rare particle physics phenomena (flavor
oscillations and decays, electric dipole moments, etc.) are often sensitive to
the effects of new physics encoded in higher-dimensional operators with Wilson
coefficients given by ${\rm C}/(\Lambda_{\rm NP})^n$, where C is dimensionless,
$n\geq 1$, and $\Lambda_{\rm NP}$ is an energy scale. Many extensions of the
Standard Model predict that $\Lambda_{\rm NP} $ should be at the electroweak
scale or above, and the search for new short-distance physics is often stated
as the primary goal of experiments at the precision frontier. In rather general
terms, we investigate the alternative possibility: ${\rm C} \ll 1$, and
$\Lambda_{\rm NP} \ll m_W$, to identify classes of precision measurements
sensitive to light new physics (hidden sectors) that do not require an
ultraviolet completion with additional states at or above the electroweak
scale. We find that hadronic electric dipole moments, lepton number and flavor
violation, non-universality, as well as lepton $g-2$ can be induced at
interesting levels by hidden sectors with light degrees of freedom. In
contrast, many hadronic flavor- and baryon number-violating observables, and
precision probes of charged currents, typically require new physics with
$\Lambda_{\rm NP} \gtrsim m_W$. Among the leptonic observables, we find that a
non-zero electron electric dipole moment near the current level of sensitivity
would point to the existence of new physics at or above the electroweak scale.
|
[
{
"created": "Thu, 7 May 2015 20:32:45 GMT",
"version": "v1"
},
{
"created": "Tue, 30 Jun 2015 20:08:16 GMT",
"version": "v2"
},
{
"created": "Fri, 9 Oct 2015 18:14:59 GMT",
"version": "v3"
}
] |
2015-10-12
|
[
[
"Dall",
"Matthias Le",
""
],
[
"Pospelov",
"Maxim",
""
],
[
"Ritz",
"Adam",
""
]
] |
Precision measurements of rare particle physics phenomena (flavor oscillations and decays, electric dipole moments, etc.) are often sensitive to the effects of new physics encoded in higher-dimensional operators with Wilson coefficients given by ${\rm C}/(\Lambda_{\rm NP})^n$, where C is dimensionless, $n\geq 1$, and $\Lambda_{\rm NP}$ is an energy scale. Many extensions of the Standard Model predict that $\Lambda_{\rm NP} $ should be at the electroweak scale or above, and the search for new short-distance physics is often stated as the primary goal of experiments at the precision frontier. In rather general terms, we investigate the alternative possibility: ${\rm C} \ll 1$, and $\Lambda_{\rm NP} \ll m_W$, to identify classes of precision measurements sensitive to light new physics (hidden sectors) that do not require an ultraviolet completion with additional states at or above the electroweak scale. We find that hadronic electric dipole moments, lepton number and flavor violation, non-universality, as well as lepton $g-2$ can be induced at interesting levels by hidden sectors with light degrees of freedom. In contrast, many hadronic flavor- and baryon number-violating observables, and precision probes of charged currents, typically require new physics with $\Lambda_{\rm NP} \gtrsim m_W$. Among the leptonic observables, we find that a non-zero electron electric dipole moment near the current level of sensitivity would point to the existence of new physics at or above the electroweak scale.
|
1205.3806
|
Thomas Becher
|
Thomas Becher (Bern U.) and Matthias Neubert (Mainz U.)
|
Factorization and NNLL Resummation for Higgs Production with a Jet Veto
|
28 pages, 5 figures; v2: published version; note added in proof
| null |
10.1007/JHEP07(2012)108
|
MZ-TH/12-18
|
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Using methods of effective field theory, we derive the first all-order
factorization theorem for the Higgs-boson production cross section with a jet
veto, imposed by means of a standard sequential recombination jet algorithm.
Like in the case of small-q_T resummation in Drell-Yan and Higgs production,
the factorization is affected by a collinear anomaly. Our analysis provides the
basis for a systematic resummation of large logarithms log(m_H/p_T^veto) beyond
leading-logarithmic order. Specifically, we present predictions for the
resummed jet-veto cross section and efficiency at next-to-next-to-leading
logarithmic order. Our results have important implications for Higgs-boson
searches at the LHC, where a jet veto is required to suppress background
events.
|
[
{
"created": "Wed, 16 May 2012 20:46:11 GMT",
"version": "v1"
},
{
"created": "Tue, 17 Jul 2012 08:21:39 GMT",
"version": "v2"
}
] |
2015-06-05
|
[
[
"Becher",
"Thomas",
"",
"Bern U."
],
[
"Neubert",
"Matthias",
"",
"Mainz U."
]
] |
Using methods of effective field theory, we derive the first all-order factorization theorem for the Higgs-boson production cross section with a jet veto, imposed by means of a standard sequential recombination jet algorithm. Like in the case of small-q_T resummation in Drell-Yan and Higgs production, the factorization is affected by a collinear anomaly. Our analysis provides the basis for a systematic resummation of large logarithms log(m_H/p_T^veto) beyond leading-logarithmic order. Specifically, we present predictions for the resummed jet-veto cross section and efficiency at next-to-next-to-leading logarithmic order. Our results have important implications for Higgs-boson searches at the LHC, where a jet veto is required to suppress background events.
|
hep-ph/0011268
| null |
H. J. de Vega and M. Simionato
|
The Landau Pole at Finite Temperature
|
LaTex, 6 pages, 2 .ps figures. Improved version. To appear in Phys.
Rev. D, Rapid Communications
|
Phys.Rev.D64:021703,2001
|
10.1103/PhysRevD.64.021703
| null |
hep-ph hep-th nucl-th
| null |
We study the Landau pole in the lambda phi^4 field theory at non-zero and
large temperatures. We show that the position of the thermal Landau pole
Lambda_L(T) is shifted to higher energies with respect to the zero temperature
Landau pole Lambda_L(0). We find for high temperatures T > Lambda_L(0),
Lambda_L(T) simeq pi^2 T / log (T / Lambda_L(0)). Therefore, the range of
applicability in energy of the lambda phi^4 field theory increases with the
temperature.
|
[
{
"created": "Tue, 21 Nov 2000 18:14:54 GMT",
"version": "v1"
},
{
"created": "Fri, 18 May 2001 13:00:55 GMT",
"version": "v2"
}
] |
2009-12-31
|
[
[
"de Vega",
"H. J.",
""
],
[
"Simionato",
"M.",
""
]
] |
We study the Landau pole in the lambda phi^4 field theory at non-zero and large temperatures. We show that the position of the thermal Landau pole Lambda_L(T) is shifted to higher energies with respect to the zero temperature Landau pole Lambda_L(0). We find for high temperatures T > Lambda_L(0), Lambda_L(T) simeq pi^2 T / log (T / Lambda_L(0)). Therefore, the range of applicability in energy of the lambda phi^4 field theory increases with the temperature.
|
1509.03052
|
Renat Sadykov
|
A. Arbuzov, D. Bardin, S. Bondarenko, P. Christova, L. Kalinovskaya,
U. Klein, V. Kolesnikov, L. Rumyantsev, R. Sadykov, A. Sapronov
|
Update of the MCSANC Monte Carlo Integrator, v.1.20
| null | null |
10.1134/S0021364016020041
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
This article presents new features of the MCSANC v.1.20 program, a Monte
Carlo tool for calculation of the next-to-leading order electroweak and QCD
corrections to various Standard Model processes. The extensions concern
implementation of Drell--Yan-like processes and include a systematic treatment
of the photon-induced contribution in proton--proton collisions and electroweak
corrections beyond NLO approximation. There are also technical improvements
such as calculation of the forward-backward asymmetry for the neutral current
Drell--Yan process. The updated code is suitable for studies of the effects due
to EW and QCD radiative corrections to Drell--Yan (and several other) processes
at the LHC and for forthcoming high energy proton--proton colliders.
|
[
{
"created": "Thu, 10 Sep 2015 08:40:42 GMT",
"version": "v1"
},
{
"created": "Thu, 1 Oct 2015 12:32:50 GMT",
"version": "v2"
}
] |
2016-05-04
|
[
[
"Arbuzov",
"A.",
""
],
[
"Bardin",
"D.",
""
],
[
"Bondarenko",
"S.",
""
],
[
"Christova",
"P.",
""
],
[
"Kalinovskaya",
"L.",
""
],
[
"Klein",
"U.",
""
],
[
"Kolesnikov",
"V.",
""
],
[
"Rumyantsev",
"L.",
""
],
[
"Sadykov",
"R.",
""
],
[
"Sapronov",
"A.",
""
]
] |
This article presents new features of the MCSANC v.1.20 program, a Monte Carlo tool for calculation of the next-to-leading order electroweak and QCD corrections to various Standard Model processes. The extensions concern implementation of Drell--Yan-like processes and include a systematic treatment of the photon-induced contribution in proton--proton collisions and electroweak corrections beyond NLO approximation. There are also technical improvements such as calculation of the forward-backward asymmetry for the neutral current Drell--Yan process. The updated code is suitable for studies of the effects due to EW and QCD radiative corrections to Drell--Yan (and several other) processes at the LHC and for forthcoming high energy proton--proton colliders.
|
hep-ph/0602209
|
Alejandro Ayala
|
Alejandro Ayala, Adnan Bashir, Alfredo Raya, and Eduardo Rojas
|
Dynamical mass generation in strongly coupled Quantum Electrodynamics
with weak magnetic fields
|
5 pages, 2 figures, references and comments added. Published version
|
Phys.Rev. D73 (2006) 105009
|
10.1103/PhysRevD.73.105009
| null |
hep-ph hep-th
| null |
We study the dynamical generation of masses for fundamental fermions in
quenched quantum electrodynamics in the presence of weak magnetic fields using
Schwinger-Dyson equations. Contrary to the case where the magnetic field is
strong, in the weak field limit the coupling should exceed certain critical
value in order for the generation of masses to take place, just as in the case
where no magnetic field is present. The weak field limit is defined as eB <<
m(0)^2, where m(0) is the value of the dynamically generated mass in the
absence of the field. We carry out a numerical analysis to study the magnetic
field dependence of the mass function above critical coupling and show that in
this regime the dynamically generated mass and the chiral condensate for the
lowest Landau level increase proportionally to (eB)^2.
|
[
{
"created": "Wed, 22 Feb 2006 18:40:41 GMT",
"version": "v1"
},
{
"created": "Wed, 24 May 2006 20:25:54 GMT",
"version": "v2"
}
] |
2007-05-23
|
[
[
"Ayala",
"Alejandro",
""
],
[
"Bashir",
"Adnan",
""
],
[
"Raya",
"Alfredo",
""
],
[
"Rojas",
"Eduardo",
""
]
] |
We study the dynamical generation of masses for fundamental fermions in quenched quantum electrodynamics in the presence of weak magnetic fields using Schwinger-Dyson equations. Contrary to the case where the magnetic field is strong, in the weak field limit the coupling should exceed certain critical value in order for the generation of masses to take place, just as in the case where no magnetic field is present. The weak field limit is defined as eB << m(0)^2, where m(0) is the value of the dynamically generated mass in the absence of the field. We carry out a numerical analysis to study the magnetic field dependence of the mass function above critical coupling and show that in this regime the dynamically generated mass and the chiral condensate for the lowest Landau level increase proportionally to (eB)^2.
|
0910.4363
|
Let\'icia Faria Domingues Palhares
|
Leticia F. Palhares, Eduardo S. Fraga, Takeshi Kodama
|
Finite-size effects and the search for the critical endpoint in heavy
ion collisions
|
9 pages, 6 figures; talk given at the 5th International Workshop on
Critical Point and Onset of Deconfinement (CPOD 2009), June 08 - 12, BNL, USA
|
PoS CPOD2009:011,2009
| null | null |
hep-ph nucl-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We discuss how the finiteness of the system created in a heavy-ion collision
affects possible signatures of the QCD critical endpoint. We show sizable
results for the modifications of the chiral phase diagram at volume scales
typically encountered in current heavy-ion collisions and address the
applicability of finite-size scaling as a tool in the experimental search for
the critical endpoint.
|
[
{
"created": "Thu, 22 Oct 2009 17:04:05 GMT",
"version": "v1"
}
] |
2010-02-24
|
[
[
"Palhares",
"Leticia F.",
""
],
[
"Fraga",
"Eduardo S.",
""
],
[
"Kodama",
"Takeshi",
""
]
] |
We discuss how the finiteness of the system created in a heavy-ion collision affects possible signatures of the QCD critical endpoint. We show sizable results for the modifications of the chiral phase diagram at volume scales typically encountered in current heavy-ion collisions and address the applicability of finite-size scaling as a tool in the experimental search for the critical endpoint.
|
hep-ph/9709484
|
Matthias Jamin
|
M. Jamin
|
The strange quark mass from scalar sum rules updated
|
3 pages, LaTeX, 1 postscript figure, uses espcrc2.sty. Talk presented
at QCD `97 conference, Montpellier, July 1997
|
Nucl.Phys.Proc.Suppl. 64 (1998) 250-252
|
10.1016/S0920-5632(97)01069-4
|
HD-THEP-97-51
|
hep-ph
| null |
The talk discusses preliminary results of an updated analysis of the strange
quark mass from the scalar current QCD sum rules [1]. In particular the role of
the scalar form factor which is a main ingredient in the analysis is especially
emphasised. The sources of the uncertainties in the sum rule determination are
briefly reviewed.
|
[
{
"created": "Mon, 29 Sep 1997 09:05:47 GMT",
"version": "v1"
}
] |
2009-10-30
|
[
[
"Jamin",
"M.",
""
]
] |
The talk discusses preliminary results of an updated analysis of the strange quark mass from the scalar current QCD sum rules [1]. In particular the role of the scalar form factor which is a main ingredient in the analysis is especially emphasised. The sources of the uncertainties in the sum rule determination are briefly reviewed.
|
hep-ph/0006079
|
Akushevich Igor
|
I.Akushevich, D.Ryckbosch, N.Shumeiko, A.Tolkachev
|
Radiative tail from the quasielastic peak in deep inelastic scattering
of polarized leptons off polarized He-3
|
10 pages, 3 figures
|
J.Phys.G26:1389-1396,2000
|
10.1088/0954-3899/26/9/308
| null |
hep-ph
| null |
The contribution of the radiative tail from the quasielastic peak to low
order radiative correction to deep inelastic scattering of polarized leptons by
polarized $^3$He was calculated within the sum rules formalism and $y$-scaling
hypothesis. Numerical analysis was carried out under the conditions of HERMES
experiment.
|
[
{
"created": "Thu, 8 Jun 2000 18:44:35 GMT",
"version": "v1"
}
] |
2008-11-26
|
[
[
"Akushevich",
"I.",
""
],
[
"Ryckbosch",
"D.",
""
],
[
"Shumeiko",
"N.",
""
],
[
"Tolkachev",
"A.",
""
]
] |
The contribution of the radiative tail from the quasielastic peak to low order radiative correction to deep inelastic scattering of polarized leptons by polarized $^3$He was calculated within the sum rules formalism and $y$-scaling hypothesis. Numerical analysis was carried out under the conditions of HERMES experiment.
|
1705.09610
|
Lobsang Dhargyal
|
Lobsang Dhargyal
|
A simple extension of SM that can explain the $(g-2)_{\mu}$ anomaly,
small neutrino mass and a dark-matter
|
Minor typos corrected to "J.Phys. G45 (2018) no.7, 075002. DOI:
10.1088/1361-6471/aac40a" in Table 1
| null |
10.1088/1361-6471/aac40a
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
In this work we propose a simple extension of standard-model (SM) by adding
eleven new particles to it. Three heavy leptons ($f_{e},\ f_{\mu},\ f_{\tau}$)
singlet under the $SU(3)_{c}\times SU(2)_{L}$ carrying respective
Lepton-Numbers, charged under the $U(1)_{Y}$ with $Y = -2$ and transforming
under a discrete symmetry as $f_{i} \rightarrow -f_{i}$. One scalar
($\phi_{2}$), singlet under all the SM gauge groups and transforming under the
discrete symmetry as $\phi_{2} \rightarrow -\phi_{2}$ which does not develops a
non zero vacuum-expectation-value (VEV). One more scalar ($\phi_{3}$), singlet
under all the SM gauge groups and invariant under the discrete symmetry which
develops a non zero VEV ($v_{3}$) and gives masses to $f_{i}$s, $\phi_{2}$ and
neutrinos. Three right-handed neutrinos ($\nu_{iR}$) and three left-handed
Majorana neutrinos ($s_{iL}$). With these new additional particles added to SM
we have been able to give explanations to the long standing muon (g -2) anomaly
as well as the smallness of neutrino masses by the inverse see-saw mechanism.
And also in this model we have a very suitable scalar dark-matter (DM)
candidate in $\phi_{2}$ with allowed mass as high as 53 GeV, although due to
large Yukawa coupling required to explain the muon (g-2), its contribution to
the DM relic density turn out to be too small and so it can account only a
small fraction of the DM relic density of the universe.
|
[
{
"created": "Wed, 24 May 2017 21:51:42 GMT",
"version": "v1"
},
{
"created": "Thu, 13 Jul 2017 06:55:45 GMT",
"version": "v2"
},
{
"created": "Fri, 11 May 2018 15:56:28 GMT",
"version": "v3"
},
{
"created": "Sun, 30 Dec 2018 15:21:38 GMT",
"version": "v4"
}
] |
2019-01-01
|
[
[
"Dhargyal",
"Lobsang",
""
]
] |
In this work we propose a simple extension of standard-model (SM) by adding eleven new particles to it. Three heavy leptons ($f_{e},\ f_{\mu},\ f_{\tau}$) singlet under the $SU(3)_{c}\times SU(2)_{L}$ carrying respective Lepton-Numbers, charged under the $U(1)_{Y}$ with $Y = -2$ and transforming under a discrete symmetry as $f_{i} \rightarrow -f_{i}$. One scalar ($\phi_{2}$), singlet under all the SM gauge groups and transforming under the discrete symmetry as $\phi_{2} \rightarrow -\phi_{2}$ which does not develops a non zero vacuum-expectation-value (VEV). One more scalar ($\phi_{3}$), singlet under all the SM gauge groups and invariant under the discrete symmetry which develops a non zero VEV ($v_{3}$) and gives masses to $f_{i}$s, $\phi_{2}$ and neutrinos. Three right-handed neutrinos ($\nu_{iR}$) and three left-handed Majorana neutrinos ($s_{iL}$). With these new additional particles added to SM we have been able to give explanations to the long standing muon (g -2) anomaly as well as the smallness of neutrino masses by the inverse see-saw mechanism. And also in this model we have a very suitable scalar dark-matter (DM) candidate in $\phi_{2}$ with allowed mass as high as 53 GeV, although due to large Yukawa coupling required to explain the muon (g-2), its contribution to the DM relic density turn out to be too small and so it can account only a small fraction of the DM relic density of the universe.
|
2201.02385
|
Gang l\"u
|
Gang L\"u, Yan-Lin Zhao, Liang-Chen Liu, Xin-Heng Guo
|
Direct $CP$ violation of three bodies decay process from the resonance
effect
| null | null |
10.1088/1674-1137/ac80ef
| null |
hep-ph
|
http://creativecommons.org/licenses/by/4.0/
|
The physical state of $\rho$-$\omega$-$\phi$ mesons can be mixed by the
unitary matrix. The decay processes of $\omega \rightarrow \pi^{+}\pi^{-}$ and
$\phi \rightarrow \pi^{+}\pi^{-}$ are from the isospin symmetry breaking. The
$\rho-\omega$, $\rho-\phi$ and $\omega-\phi$ interferences lead to resonance
contribution to produce the strong phases. The $CP$ asymmetry is considered
from above isospin symmetry breaking due to the new strong phase for the first
order. It has been found the $CP$ asymmetry can be enhanced greatly for the
decay process of $B^{0}\rightarrow\pi^+\pi^{-}\eta^{(')}$ when the invariant
masses of the $\pi^+\pi^{-}$ pairs are in the area around the $\omega$
resonance range and the $\phi$ resonance range in perturbative QCD. We also
discuss the possibility to search the predicted $CP$ violation at the LHC.
|
[
{
"created": "Fri, 7 Jan 2022 10:15:06 GMT",
"version": "v1"
},
{
"created": "Sun, 20 Feb 2022 01:21:34 GMT",
"version": "v2"
},
{
"created": "Sat, 2 Apr 2022 03:28:36 GMT",
"version": "v3"
},
{
"created": "Sun, 15 May 2022 09:28:45 GMT",
"version": "v4"
}
] |
2022-11-09
|
[
[
"Lü",
"Gang",
""
],
[
"Zhao",
"Yan-Lin",
""
],
[
"Liu",
"Liang-Chen",
""
],
[
"Guo",
"Xin-Heng",
""
]
] |
The physical state of $\rho$-$\omega$-$\phi$ mesons can be mixed by the unitary matrix. The decay processes of $\omega \rightarrow \pi^{+}\pi^{-}$ and $\phi \rightarrow \pi^{+}\pi^{-}$ are from the isospin symmetry breaking. The $\rho-\omega$, $\rho-\phi$ and $\omega-\phi$ interferences lead to resonance contribution to produce the strong phases. The $CP$ asymmetry is considered from above isospin symmetry breaking due to the new strong phase for the first order. It has been found the $CP$ asymmetry can be enhanced greatly for the decay process of $B^{0}\rightarrow\pi^+\pi^{-}\eta^{(')}$ when the invariant masses of the $\pi^+\pi^{-}$ pairs are in the area around the $\omega$ resonance range and the $\phi$ resonance range in perturbative QCD. We also discuss the possibility to search the predicted $CP$ violation at the LHC.
|
hep-ph/9504346
| null |
Jiro KODAIRA, Hiroshi TOCHIMURA, Yoshiaki YASUI, Isamu WATANABE
|
One-loop correction to the $\gamma W W$ vertex in the $e^- \gamma$
collider
|
7 figures are included, 6 pages, Talk presented by Y.Yasui at INS
Workshop "Physics of $e^+ e^-$,$e^- \gamma$ and $\gamma \gamma$ collisions at
linear accelerators"INS,Tokyo,Japan
| null | null |
HUPD-9509, OCHA-PP-57
|
hep-ph
| null |
We apply the pinch technique , which is a method to construct the gauge
independent off-shell Green's functions, to the process $e^-\gamma \rightarrow
W^-\nu$ to study the effects of radiative corrections to $WW\gamma$ three gauge
boson vertex. The one-loop contributions to the anomalous gauge boson couplings
are estimated in the standard model.
|
[
{
"created": "Thu, 20 Apr 1995 11:07:07 GMT",
"version": "v1"
}
] |
2007-05-23
|
[
[
"KODAIRA",
"Jiro",
""
],
[
"TOCHIMURA",
"Hiroshi",
""
],
[
"YASUI",
"Yoshiaki",
""
],
[
"WATANABE",
"Isamu",
""
]
] |
We apply the pinch technique , which is a method to construct the gauge independent off-shell Green's functions, to the process $e^-\gamma \rightarrow W^-\nu$ to study the effects of radiative corrections to $WW\gamma$ three gauge boson vertex. The one-loop contributions to the anomalous gauge boson couplings are estimated in the standard model.
|
hep-ph/0105146
|
Jeppe R. Andersen
|
J.R. Andersen (Durham U.), V. Del Duca (INFN, Turin), F. Maltoni
(Illinois U., Urbana) and W.J. Stirling (Durham U.)
|
W Boson Production with Associated Jets at Large Rapidities
|
33 pages
|
JHEP 0105:048,2001
|
10.1088/1126-6708/2001/05/048
|
IPPP/01/14, DCPT/01/28,DFTT 10/2001,ILL-(TH)-01-3
|
hep-ph
| null |
We analyse W boson production at hadron colliders in association with one or
two jets, both with the exact kinematics and in the high-energy limit. We argue
that the configurations that are kinematically favoured tend to have the W
boson forward in rapidity. Thus W boson production in association with jets
lends itself naturally to extensions to the high-energy limit, which we examine
both at leading order and by resumming higher-order corrections through the
BFKL theory.
|
[
{
"created": "Tue, 15 May 2001 16:53:39 GMT",
"version": "v1"
}
] |
2010-02-03
|
[
[
"Andersen",
"J. R.",
"",
"Durham U."
],
[
"Del Duca",
"V.",
"",
"INFN, Turin"
],
[
"Maltoni",
"F.",
"",
"Illinois U., Urbana"
],
[
"Stirling",
"W. J.",
"",
"Durham U."
]
] |
We analyse W boson production at hadron colliders in association with one or two jets, both with the exact kinematics and in the high-energy limit. We argue that the configurations that are kinematically favoured tend to have the W boson forward in rapidity. Thus W boson production in association with jets lends itself naturally to extensions to the high-energy limit, which we examine both at leading order and by resumming higher-order corrections through the BFKL theory.
|
hep-ph/9810385
|
Floarea Stancu
|
D. Bartz and Fl. Stancu (U. of Liege)
|
Important configurations for NN processes in a Goldstone boson exchange
model
|
17 pages, RevTeX
|
Phys.Rev. C59 (1999) 1756-1761
|
10.1103/PhysRevC.59.1756
|
ULG-PNT-98-3-FS
|
hep-ph
| null |
We study the short-range nucleon-nucleon interaction in a nonrelativistic
chiral constituent quark model by diagonalizing a Hamiltonian containing a
linear confinement and a Goldstone boson exchange interaction between quarks. A
finite six-quark basis obtained from single particle cluster model states was
previously used. Here we show that the configurations which appear naturally
through the use of molecular orbitals, instead of cluster model states, are
more efficient in lowering the six-quark energy.
|
[
{
"created": "Fri, 16 Oct 1998 14:09:59 GMT",
"version": "v1"
}
] |
2009-10-31
|
[
[
"Bartz",
"D.",
"",
"U. of Liege"
],
[
"Stancu",
"Fl.",
"",
"U. of Liege"
]
] |
We study the short-range nucleon-nucleon interaction in a nonrelativistic chiral constituent quark model by diagonalizing a Hamiltonian containing a linear confinement and a Goldstone boson exchange interaction between quarks. A finite six-quark basis obtained from single particle cluster model states was previously used. Here we show that the configurations which appear naturally through the use of molecular orbitals, instead of cluster model states, are more efficient in lowering the six-quark energy.
|
1203.6012
|
Sushant Raut
|
Vernon Barger, Raj Gandhi, Pomita Ghoshal, Srubabati Goswami, Danny
Marfatia, Suprabh Prakash, Sushant K. Raut, S. Uma Sankar
|
Neutrino mass hierarchy and octant determination with atmospheric
neutrinos
|
4 pages, 4 figures. Version published in Phys. Rev. Lett
|
Phys.Rev.Lett.109:091801,2012
|
10.1103/PhysRevLett.109.091801
| null |
hep-ph hep-ex
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
The recent discovery by the Daya-Bay and RENO experiments, that \theta_{13}
is nonzero and relatively large, significantly impacts existing experiments and
the planning of future facilities. In many scenarios, the nonzero value of
\theta_{13} implies that \theta_{23} is likely to be different from \pi/4.
Additionally, large detectors will be sensitive to matter effects on the
oscillations of atmospheric neutrinos, making it possible to determine the
neutrino mass hierarchy and the octant of \theta_{23}. We show that a 50 kT
magnetized liquid argon neutrino detector can ascertain the mass hierarchy with
a significance larger than 4 sigma with moderate exposure times, and the octant
at the level of 2-3 sigma with greater exposure.
|
[
{
"created": "Tue, 27 Mar 2012 16:17:05 GMT",
"version": "v1"
},
{
"created": "Fri, 18 May 2012 10:55:46 GMT",
"version": "v2"
},
{
"created": "Tue, 4 Sep 2012 06:32:34 GMT",
"version": "v3"
}
] |
2012-09-05
|
[
[
"Barger",
"Vernon",
""
],
[
"Gandhi",
"Raj",
""
],
[
"Ghoshal",
"Pomita",
""
],
[
"Goswami",
"Srubabati",
""
],
[
"Marfatia",
"Danny",
""
],
[
"Prakash",
"Suprabh",
""
],
[
"Raut",
"Sushant K.",
""
],
[
"Sankar",
"S. Uma",
""
]
] |
The recent discovery by the Daya-Bay and RENO experiments, that \theta_{13} is nonzero and relatively large, significantly impacts existing experiments and the planning of future facilities. In many scenarios, the nonzero value of \theta_{13} implies that \theta_{23} is likely to be different from \pi/4. Additionally, large detectors will be sensitive to matter effects on the oscillations of atmospheric neutrinos, making it possible to determine the neutrino mass hierarchy and the octant of \theta_{23}. We show that a 50 kT magnetized liquid argon neutrino detector can ascertain the mass hierarchy with a significance larger than 4 sigma with moderate exposure times, and the octant at the level of 2-3 sigma with greater exposure.
|
hep-ph/0012068
|
Jan Ridky
|
Jan Ridky
|
Can We Observe the Quark Gluon Plasma in Cosmic Ray Showers ?
|
16 pages, 8 figures, amended version
|
Astropart.Phys.17:355-365,2002
|
10.1016/S0927-6505(01)00161-X
|
PRA-HEP-00/04
|
hep-ph
| null |
The possibility of detection of some features of high energy particle
interactions with detectors placed at medium depths underground through studies
on high energy muons is investigated. These muons carry information about the
early interactions occurring during the development of the hadron cascade near
the top of the atmosphere. They might reveal the effects resulting from
creation of quark gluon plasma in interactions of ultra high energy cosmic ray
iron nuclei with air nuclei.
|
[
{
"created": "Wed, 6 Dec 2000 14:42:46 GMT",
"version": "v1"
},
{
"created": "Sat, 9 Dec 2000 17:08:55 GMT",
"version": "v2"
},
{
"created": "Wed, 8 Aug 2001 07:21:47 GMT",
"version": "v3"
}
] |
2015-04-09
|
[
[
"Ridky",
"Jan",
""
]
] |
The possibility of detection of some features of high energy particle interactions with detectors placed at medium depths underground through studies on high energy muons is investigated. These muons carry information about the early interactions occurring during the development of the hadron cascade near the top of the atmosphere. They might reveal the effects resulting from creation of quark gluon plasma in interactions of ultra high energy cosmic ray iron nuclei with air nuclei.
|
hep-ph/9904386
|
Vladimir B. Kopeliovich
|
V.B. Kopeliovich and W.J. Zakrzewski (Institute for Nuclear Research
of Russian Academy of Sciences, Moscow, Department of Mathematical Sciences,
University of Durham, Durham)
|
Flavoured multiskyrmions
|
7 pages, no figures. Submitted to JETP Letters
|
JETP Lett.69:721-727,1999; Pisma Zh.Eksp.Teor.Fiz.69:675-680,1999
|
10.1134/1.568081
| null |
hep-ph
| null |
Static properties of multiskyrmions with baryon numbers up to 8 are
calculated starting from recently given rational map ansaetze. The spectra of
baryonic systems with strangeness, charm and bottom are estimated within a
"rigid oscillator" version of the bound state soliton model. It is suggested
that the recently observed negatively charged nuclear fragment can be
considered as quantized strange multiskyrmion with baryon number 6 or 7 and
large value of strangeness. In agreement with previous observation, it is
argued that baryonic systems with charm or bottom quantum numbers have more
chances to be bound with respect to strong interactions than strange baryonic
systems.
|
[
{
"created": "Mon, 19 Apr 1999 12:21:40 GMT",
"version": "v1"
}
] |
2011-01-27
|
[
[
"Kopeliovich",
"V. B.",
"",
"Institute for Nuclear Research\n of Russian Academy of Sciences, Moscow, Department of Mathematical Sciences,\n University of Durham, Durham"
],
[
"Zakrzewski",
"W. J.",
"",
"Institute for Nuclear Research\n of Russian Academy of Sciences, Moscow, Department of Mathematical Sciences,\n University of Durham, Durham"
]
] |
Static properties of multiskyrmions with baryon numbers up to 8 are calculated starting from recently given rational map ansaetze. The spectra of baryonic systems with strangeness, charm and bottom are estimated within a "rigid oscillator" version of the bound state soliton model. It is suggested that the recently observed negatively charged nuclear fragment can be considered as quantized strange multiskyrmion with baryon number 6 or 7 and large value of strangeness. In agreement with previous observation, it is argued that baryonic systems with charm or bottom quantum numbers have more chances to be bound with respect to strong interactions than strange baryonic systems.
|
hep-ph/0508108
|
Wim de Boer
|
W. de Boer (University of Karlsruhe)
|
Dark Matter visible by the EGRET Excess of Diffuse Galactic Gamma Rays?
|
Invited talk at 2005 International Linear Collider Workshop, Stanford
Ca (LCWS05) 10 pages, LaTeX, 7 eps figures
| null | null | null |
hep-ph
| null |
The public data from the EGRET space telescope on diffuse galactic gamma rays
in the energy range from 0.1 to 10 GeV show an excess for energies above 1 GeV
in comparison with the expectations from conventional galactic models. This
excess shows all the key features of Dark Matter Annihilation (DMA), like being
observable in al sky directions with a shape corresponding to a WIMP mass
between 50 and 100 GeV. The intensity of the excess in various directions can
be used to reconstruct the DM profile, which - combined with the distribution
of visible matter - allows to calculate the rotation curve of our Galaxy. Its
peculiar shape, which is not flat, but shows a minimum and maximum, is indeed
reconstructed from the gamma rays, thus proving that the EGRET excess traces
the DM. Furthermore, the spectral shape of the excess is consistent with mSUGRA
and the WMAP relic density for rather heavy squarks and sleptons - O(1 TeV) -
and light charginos, neutralinos and gluinos (below 500 GeV).
|
[
{
"created": "Tue, 9 Aug 2005 17:45:58 GMT",
"version": "v1"
}
] |
2007-05-23
|
[
[
"de Boer",
"W.",
"",
"University of Karlsruhe"
]
] |
The public data from the EGRET space telescope on diffuse galactic gamma rays in the energy range from 0.1 to 10 GeV show an excess for energies above 1 GeV in comparison with the expectations from conventional galactic models. This excess shows all the key features of Dark Matter Annihilation (DMA), like being observable in al sky directions with a shape corresponding to a WIMP mass between 50 and 100 GeV. The intensity of the excess in various directions can be used to reconstruct the DM profile, which - combined with the distribution of visible matter - allows to calculate the rotation curve of our Galaxy. Its peculiar shape, which is not flat, but shows a minimum and maximum, is indeed reconstructed from the gamma rays, thus proving that the EGRET excess traces the DM. Furthermore, the spectral shape of the excess is consistent with mSUGRA and the WMAP relic density for rather heavy squarks and sleptons - O(1 TeV) - and light charginos, neutralinos and gluinos (below 500 GeV).
|
0709.1753
|
Baier
|
V. N. Baier and V. M. Katkov
|
Spectrum and polarization of coherent and incoherent radiation and the
LPM effect in oriented single crystal
|
13 pages, 7 figures
|
Nucl.Instrum.Meth.B266:3828-3834,2008
|
10.1016/j.nimb.2008.01.046
|
BINP-2007-22
|
hep-ph
| null |
The spectrum and the circular polarization of radiation from longitudinally
polarized high-energy electrons in oriented single crystal are considered using
the method which permits inseparable consideration of both the coherent and the
incoherent mechanisms of photon emission. The spectral and polarization
properties of radiation are obtained and analyzed. It is found that in some
part of spectral distribution the influence of multiple scattering (the
Landau-Pomeranchuk-Migdal (LPM) effect) attains the order of 7 percent. The
same is true for the influence of multiple scattering on the polarization part
of the radiation intensity. The degree of circular polarization of total
intensity of radiation is found. It is shown that the influence of multiple
scattering on the photon polarization is similar to the influence of the LPM
effect on the total intensity of radiation: it appears only for relatively low
energies of radiating electron and has the order of 1 percent, while at higher
energies the crystal field action excludes the LPM effect.
|
[
{
"created": "Wed, 12 Sep 2007 04:16:33 GMT",
"version": "v1"
}
] |
2008-11-26
|
[
[
"Baier",
"V. N.",
""
],
[
"Katkov",
"V. M.",
""
]
] |
The spectrum and the circular polarization of radiation from longitudinally polarized high-energy electrons in oriented single crystal are considered using the method which permits inseparable consideration of both the coherent and the incoherent mechanisms of photon emission. The spectral and polarization properties of radiation are obtained and analyzed. It is found that in some part of spectral distribution the influence of multiple scattering (the Landau-Pomeranchuk-Migdal (LPM) effect) attains the order of 7 percent. The same is true for the influence of multiple scattering on the polarization part of the radiation intensity. The degree of circular polarization of total intensity of radiation is found. It is shown that the influence of multiple scattering on the photon polarization is similar to the influence of the LPM effect on the total intensity of radiation: it appears only for relatively low energies of radiating electron and has the order of 1 percent, while at higher energies the crystal field action excludes the LPM effect.
|
2209.12281
|
Norimi Yokozaki
|
Weikang Lin, Tsutomu T. Yanagida, Norimi Yokozaki
|
The anomalous shift of the weak boson mass and the quintessence
electroweak axion
|
6 pages, 1 figure, corrected typos, version to appear in
"Communications in Theoretical Physics"
| null |
10.1088/1572-9494/acb3b5
| null |
hep-ph astro-ph.CO hep-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
One of the simplest ways to account for the observed W-boson mass shift is to
introduce the $SU(2)_L$ triplet Higgs boson with zero hypercharge, whose vacuum
expectation value is about 3 GeV. If the triplet is heavy enough at
$\mathcal{O}(1)$ TeV, it essentially contributes only to $T$ parameter without
any conflict to the observation. The presence of a complex triplet Higgs boson
raises the $SU(2)_L$ gauge coupling constant to $\alpha_2(M_{\rm PL} )\simeq
1/44$ at the Planck scale. Thanks to this larger gauge coupling constant, we
show that the electroweak axion vacuum energy explains the observed
cosmological constant provided that the axion field is located near the hill
top of the potential at present.
|
[
{
"created": "Sun, 25 Sep 2022 18:01:27 GMT",
"version": "v1"
},
{
"created": "Sat, 14 Jan 2023 09:09:32 GMT",
"version": "v2"
}
] |
2023-01-19
|
[
[
"Lin",
"Weikang",
""
],
[
"Yanagida",
"Tsutomu T.",
""
],
[
"Yokozaki",
"Norimi",
""
]
] |
One of the simplest ways to account for the observed W-boson mass shift is to introduce the $SU(2)_L$ triplet Higgs boson with zero hypercharge, whose vacuum expectation value is about 3 GeV. If the triplet is heavy enough at $\mathcal{O}(1)$ TeV, it essentially contributes only to $T$ parameter without any conflict to the observation. The presence of a complex triplet Higgs boson raises the $SU(2)_L$ gauge coupling constant to $\alpha_2(M_{\rm PL} )\simeq 1/44$ at the Planck scale. Thanks to this larger gauge coupling constant, we show that the electroweak axion vacuum energy explains the observed cosmological constant provided that the axion field is located near the hill top of the potential at present.
|
hep-ph/0503106
|
Tadafumi Ohsaku
|
Tadafumi Ohsaku
|
Chiral Symmetry Restoration through Hawking-Unruh Thermalization Effect
|
2 pages. To be published in RCNP annual report 2004 (Osaka
University)
| null | null | null |
hep-ph astro-ph gr-qc hep-th nucl-th
| null |
Comments on the chiral symmetry restoration through the Hawking-Unruh effect
are given.
|
[
{
"created": "Fri, 11 Mar 2005 15:06:31 GMT",
"version": "v1"
},
{
"created": "Mon, 19 Sep 2005 15:30:27 GMT",
"version": "v2"
}
] |
2016-09-06
|
[
[
"Ohsaku",
"Tadafumi",
""
]
] |
Comments on the chiral symmetry restoration through the Hawking-Unruh effect are given.
|
1003.4300
|
Mikhail Gorshteyn
|
M. Gorchtein, C.J. Horowitz, M.J. Ramsey-Musolf
|
Dispersion corrections to parity violating electron scattering
|
6 pages, 3 figures, 2 tables; To be published in the proceedings of
the VIII Latin American Symposium on Nuclear Physics and Applications,
December 15-19, 2009, Santiago, Chiile
| null |
10.1063/1.3480196
| null |
hep-ph nucl-ex nucl-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We consider the dispersion correction to elastic parity violating
electron-proton scattering due to \gammaZ exchange. In a recent publication,
this correction was reported to be substantially larger than the previous
estimates. In this paper, we study the dispersion correction in greater detail.
We confirm the size of the disperion correction to be 6% for the QWEAK
experiment designed to measure the proton weak charge. We enumerate parameters
that have to be constrained to better than relative 30% in order to keep the
theoretical uncertainty for QWEAK under control.
|
[
{
"created": "Mon, 22 Mar 2010 22:51:14 GMT",
"version": "v1"
}
] |
2015-05-18
|
[
[
"Gorchtein",
"M.",
""
],
[
"Horowitz",
"C. J.",
""
],
[
"Ramsey-Musolf",
"M. J.",
""
]
] |
We consider the dispersion correction to elastic parity violating electron-proton scattering due to \gammaZ exchange. In a recent publication, this correction was reported to be substantially larger than the previous estimates. In this paper, we study the dispersion correction in greater detail. We confirm the size of the disperion correction to be 6% for the QWEAK experiment designed to measure the proton weak charge. We enumerate parameters that have to be constrained to better than relative 30% in order to keep the theoretical uncertainty for QWEAK under control.
|
hep-ph/9904418
|
Lokhtin
|
I.P.Lokhtin
|
In-medium parton energy losses and characteristics of hadronic jets in
ultra-relativistic nuclear collisions
|
Talk given at XXXIVth Rencontres de Moriond "QCD and High Energy
Hadronic Interactions", Les Arcs, France, March 20-27, 1999; 5 pages
including 2 eps-figures
| null | null | null |
hep-ph
| null |
The angular structure of collisional and radiative energy losses of a hard
parton jet propagating through the quark-gluon plasma is analyzed. The
possibility to observe the energy losses of quark- and gluon-initiated jets in
dense QCD-matter (jet quenching) measuring the characteristics of real hadronic
jets in ultra-relativistic collisions of nuclei is investigated. In particular,
using calorimetric studies of jet + jet, gamma + jet and Z + jet channels is
discussed.
|
[
{
"created": "Wed, 21 Apr 1999 11:22:28 GMT",
"version": "v1"
}
] |
2016-09-06
|
[
[
"Lokhtin",
"I. P.",
""
]
] |
The angular structure of collisional and radiative energy losses of a hard parton jet propagating through the quark-gluon plasma is analyzed. The possibility to observe the energy losses of quark- and gluon-initiated jets in dense QCD-matter (jet quenching) measuring the characteristics of real hadronic jets in ultra-relativistic collisions of nuclei is investigated. In particular, using calorimetric studies of jet + jet, gamma + jet and Z + jet channels is discussed.
|
2211.08721
|
Giang Bui Thi Ha
|
Bui Thi Ha Giang
|
The cross-section for the $\gamma e^{-} \rightarrow Ze^{-} \rightarrow
l^{-} l^{+} e^{-} $ scattering at the LHeC
|
9 pages, 5 figures, 1 table
|
Chinese Physics C , 2023
|
10.1088/1674-1137/aca4c2
|
47, no.2,023108
|
hep-ph
|
http://creativecommons.org/licenses/by/4.0/
|
A measurement of Z production cross-section in $\gamma e^{-}$ collision at
Large Hadron-electron Collider (LHeC) is presented to compare to that at
International Linear Collider (ILC). The total cross-section depends strongly
on the polarization of the initial and final $e^{-}$ beams, the electron beam
energy $E_{e}$ with the energy of the proton beam taken to be $E_{p} = 7$ TeV.
The result shows that the total cross-section in $\gamma e^{-} \rightarrow Z
e^{-} \rightarrow l^{-}l^{+}e^{-}$ at LHeC is much larger than that at ILC.
|
[
{
"created": "Wed, 16 Nov 2022 07:23:06 GMT",
"version": "v1"
}
] |
2023-01-11
|
[
[
"Giang",
"Bui Thi Ha",
""
]
] |
A measurement of Z production cross-section in $\gamma e^{-}$ collision at Large Hadron-electron Collider (LHeC) is presented to compare to that at International Linear Collider (ILC). The total cross-section depends strongly on the polarization of the initial and final $e^{-}$ beams, the electron beam energy $E_{e}$ with the energy of the proton beam taken to be $E_{p} = 7$ TeV. The result shows that the total cross-section in $\gamma e^{-} \rightarrow Z e^{-} \rightarrow l^{-}l^{+}e^{-}$ at LHeC is much larger than that at ILC.
|
1512.01071
|
Thomas Wolkanowski
|
Thomas Wolkanowski, Milena Soltysiak, Francesco Giacosa
|
$K_{0}^{\ast}(800)$ as a companion pole of $K_{0}^{\ast}(1430)$
|
7 pages, 5 figures, 2 tables
| null |
10.1016/j.nuclphysb.2016.05.025
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We study the light scalar sector up to $1.8$ GeV by using a quantum field
theoretical approach which includes a single kaonic state in a Lagrangian with
both derivative and non-derivative interactions. By performing a fit to $\pi K$
phase shift data in the $I=1/2,$ $J=0$ channel, we show that
$K_{0}^{\ast}(800)$ (or $\kappa$) emerges as a dynamically generated companion
pole of $K_{0}^{\ast }(1430)$. This is a result of investigating quantum
fluctuations with one kaon and one pion circulating in the loops dressing
$K_{0}^{\ast}(1430)$. We determine the position of the poles on the complex
plane in the context of our approach: for $K_{0}^{\ast}(1430)$ we get
$(1.413\pm0.002)-i{0.02cm}(0.127\pm0.003)$ (in GeV), while for $\kappa$ we get
$(0.746\pm0.019)-i{0.02cm}(0.262\pm0.014)$ (in GeV). The model-dependence of
these results and related uncertainties are discussed in the paper. A
large-$N_{c}$ study confirms that $K_{0}^{\ast}(1430)$ is predominantly a
quarkonium and that $K_{0}^{\ast}(800)$ is a molecular-like dynamically
generated state.
|
[
{
"created": "Thu, 3 Dec 2015 13:17:06 GMT",
"version": "v1"
},
{
"created": "Fri, 17 Jun 2016 12:51:48 GMT",
"version": "v2"
}
] |
2016-06-20
|
[
[
"Wolkanowski",
"Thomas",
""
],
[
"Soltysiak",
"Milena",
""
],
[
"Giacosa",
"Francesco",
""
]
] |
We study the light scalar sector up to $1.8$ GeV by using a quantum field theoretical approach which includes a single kaonic state in a Lagrangian with both derivative and non-derivative interactions. By performing a fit to $\pi K$ phase shift data in the $I=1/2,$ $J=0$ channel, we show that $K_{0}^{\ast}(800)$ (or $\kappa$) emerges as a dynamically generated companion pole of $K_{0}^{\ast }(1430)$. This is a result of investigating quantum fluctuations with one kaon and one pion circulating in the loops dressing $K_{0}^{\ast}(1430)$. We determine the position of the poles on the complex plane in the context of our approach: for $K_{0}^{\ast}(1430)$ we get $(1.413\pm0.002)-i{0.02cm}(0.127\pm0.003)$ (in GeV), while for $\kappa$ we get $(0.746\pm0.019)-i{0.02cm}(0.262\pm0.014)$ (in GeV). The model-dependence of these results and related uncertainties are discussed in the paper. A large-$N_{c}$ study confirms that $K_{0}^{\ast}(1430)$ is predominantly a quarkonium and that $K_{0}^{\ast}(800)$ is a molecular-like dynamically generated state.
|
hep-ph/0308293
|
Chris Michael
|
C. Michael
|
Hybrid Mesons from the Lattice
|
12 pages, LATEX, 2 ps figures., Proc. Gluonic excitations
| null | null |
LTH586
|
hep-ph
| null |
I review lattice QCD results for hybrid mesons, including a discussion of
their hadronic decays.
|
[
{
"created": "Thu, 28 Aug 2003 10:06:31 GMT",
"version": "v1"
}
] |
2007-05-23
|
[
[
"Michael",
"C.",
""
]
] |
I review lattice QCD results for hybrid mesons, including a discussion of their hadronic decays.
|
hep-ph/9703314
|
Martin McDermott
|
W. Buchmueller, A. Hebecker and M.F. McDermott
|
Charm as a Key to Diffractive Processes
|
10 pages, latex, 4 figures. Minor modifications to text in response
to referees report. Accepted for publication in Phys. Lett. B
|
Phys.Lett.B404:353-361,1997
|
10.1016/S0370-2693(97)00560-1
|
DESY 97-035, DAMTP-97-15
|
hep-ph
| null |
The diffractive production of open charm in deep-inelastic scattering is
studied in the semiclassical approach which has been proposed recently. In this
approach, the leading order process contains a charm quark pair and an
additional gluon in the diffractive final state. The $p_{\perp}$-spectrum and
the diffractive mass distribution are evaluated and compared with predictions
based on perturbative two-gluon exchange calculations for charm quark pair
production. It is shown that the $p_{\perp}$-spectrum provides a clear test of
the underlying partonic process whereas the diffractive mass distribution
reflects the non-perturbative mechanism of colour neutralization.
|
[
{
"created": "Thu, 13 Mar 1997 12:03:49 GMT",
"version": "v1"
},
{
"created": "Mon, 12 May 1997 17:01:10 GMT",
"version": "v2"
}
] |
2009-02-20
|
[
[
"Buchmueller",
"W.",
""
],
[
"Hebecker",
"A.",
""
],
[
"McDermott",
"M. F.",
""
]
] |
The diffractive production of open charm in deep-inelastic scattering is studied in the semiclassical approach which has been proposed recently. In this approach, the leading order process contains a charm quark pair and an additional gluon in the diffractive final state. The $p_{\perp}$-spectrum and the diffractive mass distribution are evaluated and compared with predictions based on perturbative two-gluon exchange calculations for charm quark pair production. It is shown that the $p_{\perp}$-spectrum provides a clear test of the underlying partonic process whereas the diffractive mass distribution reflects the non-perturbative mechanism of colour neutralization.
|
0911.3103
|
Jose W. F. Valle
|
J. W. F. Valle
|
Neutrino mass in supersymmetry
|
10 pages, 8 composite figures, plenary talk at SUSY09, to be
published in proceedings (AIP)
|
AIP Conf.Proc.1200:112-121,2010
|
10.1063/1.3327549
|
IFIC/09-vv
|
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
After summarizing neutrino oscillation results I discuss high and low-scale
seesaw mechanisms, with or without supersymmetry, as well as recent attempts to
understand the pattern of neutrino mixing from flavor symmetries. I also
mention the possibility of intrinsic supersymmetric neutrino masses in the
context of broken R parity models, showing how this leads to clear tests at the
LHC.
|
[
{
"created": "Mon, 16 Nov 2009 18:02:09 GMT",
"version": "v1"
}
] |
2014-11-20
|
[
[
"Valle",
"J. W. F.",
""
]
] |
After summarizing neutrino oscillation results I discuss high and low-scale seesaw mechanisms, with or without supersymmetry, as well as recent attempts to understand the pattern of neutrino mixing from flavor symmetries. I also mention the possibility of intrinsic supersymmetric neutrino masses in the context of broken R parity models, showing how this leads to clear tests at the LHC.
|
1103.5140
|
Azar Mustafayev
|
John Ellis, Azar Mustafayev and Keith A.Olive
|
Constrained Supersymmetric Flipped SU(5) GUT Phenomenology
|
23 pages, 8 figures; (v2) added explanations and corrected typos,
version to appear in EPJC
|
Eur.Phys.J.C71:1689,2011
|
10.1140/epjc/s10052-011-1689-z
|
CERN-PH-TH/2011-037, KCL-PH-TH/2011-07, UMN--TH--2940/11,
FTPI--MINN--11/07, SU--ITP--11/18, SLAC--PUB--14411
|
hep-ph astro-ph.CO hep-ex
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We explore the phenomenology of the minimal supersymmetric flipped SU(5) GUT
model (CFSU(5)), whose soft supersymmetry-breaking (SSB) mass parameters are
constrained to be universal at some input scale, $M_{in}$, above the GUT scale,
$M_{GUT}$. We analyze the parameter space of CFSU(5) assuming that the lightest
supersymmetric particle (LSP) provides the cosmological cold dark matter,
paying careful attention to the matching of parameters at the GUT scale. We
first display some specific examples of the evolutions of the SSB parameters
that exhibit some generic features. Specifically, we note that the relationship
between the masses of the lightest neutralino and the lighter stau is sensitive
to $M_{in}$, as is the relationship between the neutralino mass and the masses
of the heavier Higgs bosons. For these reasons, prominent features in generic
$(m_{1/2}, m_0)$ planes such as coannihilation strips and rapid-annihilation
funnels are also sensitive to $M_{in}$, as we illustrate for several cases with
tan(beta)=10 and 55. However, these features do not necessarily disappear at
large $M_{in}$, unlike the case in the minimal conventional SU(5) GUT. Our
results are relatively insensitive to neutrino masses.
|
[
{
"created": "Sat, 26 Mar 2011 16:35:51 GMT",
"version": "v1"
},
{
"created": "Mon, 11 Jul 2011 19:48:03 GMT",
"version": "v2"
}
] |
2011-07-13
|
[
[
"Ellis",
"John",
""
],
[
"Mustafayev",
"Azar",
""
],
[
"Olive",
"Keith A.",
""
]
] |
We explore the phenomenology of the minimal supersymmetric flipped SU(5) GUT model (CFSU(5)), whose soft supersymmetry-breaking (SSB) mass parameters are constrained to be universal at some input scale, $M_{in}$, above the GUT scale, $M_{GUT}$. We analyze the parameter space of CFSU(5) assuming that the lightest supersymmetric particle (LSP) provides the cosmological cold dark matter, paying careful attention to the matching of parameters at the GUT scale. We first display some specific examples of the evolutions of the SSB parameters that exhibit some generic features. Specifically, we note that the relationship between the masses of the lightest neutralino and the lighter stau is sensitive to $M_{in}$, as is the relationship between the neutralino mass and the masses of the heavier Higgs bosons. For these reasons, prominent features in generic $(m_{1/2}, m_0)$ planes such as coannihilation strips and rapid-annihilation funnels are also sensitive to $M_{in}$, as we illustrate for several cases with tan(beta)=10 and 55. However, these features do not necessarily disappear at large $M_{in}$, unlike the case in the minimal conventional SU(5) GUT. Our results are relatively insensitive to neutrino masses.
|
hep-ph/9909550
|
Skalozub Vladimir Volodymyr
|
Vladimir Skalozub and Vadim Demchik
|
Can Baryogenesis Survive in the Standard Model Due To Strong
Hypermagnetic Field?
|
26 pages, 2 figures, 1 table
| null | null | null |
hep-ph
| null |
The electroweak phase transition in a constant hypermagnetic field=A0 is
studied in the Standard Model. The symmetry behaviour is investigated within
the consistent effective potential of the scalar and magnetic fields at finite
temperature. It includes the one-loop and ring diagram contributions. All
fundamental fermions and bosons are taken into consideration with their actual
masses. The only free parameter is the Higgs boson mass which is chosen to be
in the energy interval 75 GeV $\le m_H \le$=A0 115 GeV.=A0 It is found that for
the field strengths $H \sim 10^{22}- 10^{23}$G the electroweak phase transition
is of first order but a baryogenesis condition is not satisfied. For stronger
fields it=A0 becomes of second order. Hence it is concluded that the smooth
hypermagnetic field does not generate the strong first order phase transition
and the baryogenesis does not survive in the Standard Model. The comparison
with the results of other approaches is done.
|
[
{
"created": "Wed, 29 Sep 1999 11:34:43 GMT",
"version": "v1"
}
] |
2007-05-23
|
[
[
"Skalozub",
"Vladimir",
""
],
[
"Demchik",
"Vadim",
""
]
] |
The electroweak phase transition in a constant hypermagnetic field=A0 is studied in the Standard Model. The symmetry behaviour is investigated within the consistent effective potential of the scalar and magnetic fields at finite temperature. It includes the one-loop and ring diagram contributions. All fundamental fermions and bosons are taken into consideration with their actual masses. The only free parameter is the Higgs boson mass which is chosen to be in the energy interval 75 GeV $\le m_H \le$=A0 115 GeV.=A0 It is found that for the field strengths $H \sim 10^{22}- 10^{23}$G the electroweak phase transition is of first order but a baryogenesis condition is not satisfied. For stronger fields it=A0 becomes of second order. Hence it is concluded that the smooth hypermagnetic field does not generate the strong first order phase transition and the baryogenesis does not survive in the Standard Model. The comparison with the results of other approaches is done.
|
hep-ph/0212087
|
Mauro Napsuciale
|
M. Napsuciale, S. Rodriguez and E. Alvarado-Anell
|
Radiative decays of light vector mesons in a quark level linear sigma
model
|
8 pages, submitted to Phys. Rev. D
|
Phys.Rev.D67:036007,2003
|
10.1103/PhysRevD.67.036007
| null |
hep-ph
| null |
We calculate the P0 to gamma gamma, V0 to P0 gamma and V0to V'0 gamma gamma
decays in the framework of a U(3)xU(3) linear sigma model which includes
constituent quarks. For the first two decays this approach improves results
based on the anomalous Wess-Zumino term, with contributions due to SU(3)
symmetry breaking and vector mixing. The phi to (omega,rho) gamma gamma decays
are dominated by resonant eta' exchange . Our calculation for the later decays
improves and update similar calculations in the -closely related- framework of
vector meson dominance. We obtain BR(phi to rho gamma gamma)=2.5x10^{-5} and
BR(phi to omega gamma gamma)=2.8x10^{-6} within the scope of the
high-luminosity phi factories.
|
[
{
"created": "Thu, 5 Dec 2002 17:32:02 GMT",
"version": "v1"
}
] |
2009-09-24
|
[
[
"Napsuciale",
"M.",
""
],
[
"Rodriguez",
"S.",
""
],
[
"Alvarado-Anell",
"E.",
""
]
] |
We calculate the P0 to gamma gamma, V0 to P0 gamma and V0to V'0 gamma gamma decays in the framework of a U(3)xU(3) linear sigma model which includes constituent quarks. For the first two decays this approach improves results based on the anomalous Wess-Zumino term, with contributions due to SU(3) symmetry breaking and vector mixing. The phi to (omega,rho) gamma gamma decays are dominated by resonant eta' exchange . Our calculation for the later decays improves and update similar calculations in the -closely related- framework of vector meson dominance. We obtain BR(phi to rho gamma gamma)=2.5x10^{-5} and BR(phi to omega gamma gamma)=2.8x10^{-6} within the scope of the high-luminosity phi factories.
|
0704.0029
|
Weizhen Deng
|
Zhan Shu, Xiao-Lin Chen and Wei-Zhen Deng
|
Understanding the Flavor Symmetry Breaking and Nucleon Flavor-Spin
Structure within Chiral Quark Model
| null |
Phys.Rev.D75:094018,2007
|
10.1103/PhysRevD.75.094018
| null |
hep-ph
| null |
In $\XQM$, a quark can emit Goldstone bosons. The flavor symmetry breaking in
the Goldstone boson emission process is used to intepret the nucleon
flavor-spin structure. In this paper, we study the inner structure of
constituent quarks implied in $\XQM$ caused by the Goldstone boson emission
process in nucleon. From a simplified model Hamiltonian derived from $\XQM$,
the intrinsic wave functions of constituent quarks are determined. Then the
obtained transition probabilities of the emission of Goldstone boson from a
quark can give a reasonable interpretation to the flavor symmetry breaking in
nucleon flavor-spin structure.
|
[
{
"created": "Sat, 31 Mar 2007 14:10:06 GMT",
"version": "v1"
},
{
"created": "Thu, 26 Apr 2007 08:27:20 GMT",
"version": "v2"
}
] |
2010-04-23
|
[
[
"Shu",
"Zhan",
""
],
[
"Chen",
"Xiao-Lin",
""
],
[
"Deng",
"Wei-Zhen",
""
]
] |
In $\XQM$, a quark can emit Goldstone bosons. The flavor symmetry breaking in the Goldstone boson emission process is used to intepret the nucleon flavor-spin structure. In this paper, we study the inner structure of constituent quarks implied in $\XQM$ caused by the Goldstone boson emission process in nucleon. From a simplified model Hamiltonian derived from $\XQM$, the intrinsic wave functions of constituent quarks are determined. Then the obtained transition probabilities of the emission of Goldstone boson from a quark can give a reasonable interpretation to the flavor symmetry breaking in nucleon flavor-spin structure.
|
2006.07751
|
Nestor Quintero
|
Jonathan Cardozo, J. H. Mu\~noz, Nestor Quintero, and Eduardo Rojas
|
Analysing the charged scalar boson contribution to the charged-current
$B$ meson anomalies
|
20 pages, 5 figures (14 plots), 7 Tables. V3: typos corrected,
discussion improved
|
J. Phys. G: Nucl. Part. Phys. 48, 035001 (2021)
|
10.1088/1361-6471/abc865
| null |
hep-ph hep-ex
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Experimental measurements collected by the BABAR, Belle, and LHCb experiments
on different observables associated with the semileptonic transition $b \to c
\tau \bar{\nu}_\tau$, indicate the existence of disagreement respect with the
Standard Model predictions. We analyse the charged scalar boson contributions
to these charged-current $B$ meson anomalies within the framework of two Higgs
doublet model with the most general Yukawa couplings to quarks and leptons from
the third generation, involving left-handed and right-handed (sterile)
neutrinos. We perform a phenomenological study of the Yukawa couplings
parameter space that accommodates these anomalies. We consider the most recent
data from HFLAV world-average and Belle combination, and the upper limits ${\rm
BR}(B_c^- \to \tau^- \bar{\nu}_{\tau}) < 30\%$ and $10\%$. In addition, we
include in our study the prospect measurements on $R(D^{(\ast)})$ that the
Belle II experiment could achieve and explore, for the first time, the future
implications for the corresponding charged scalar Yukawa couplings. This
analysis updates the existing literature and includes new important
observables. Our results show that current experimental $b\rightarrow c \tau
\bar{\nu}_\tau$ data and Belle II projection favor the interpretation of a
charged scalar boson interacting with right-handed neutrinos. Furthermore, as a
side analysis regarding the charged scalar boson interpretation, we revisit the
relation between $R(D^\ast)$ and ${\rm BR}(B_c^- \to \tau^- \bar{\nu}_{\tau})$
by investigating whether the claim that pseudoscalar new physics
interpretations of $R(D^{\ast})$ are implausible due to the $B_c$ lifetime is
still valid, to the light of the recent data and Belle II prospects on
$R(D^{\ast})$. Lastly, we reexamine addressing the $R(D^{(\ast)})$ anomalies in
the context of the 2HDM of Type II.
|
[
{
"created": "Sun, 14 Jun 2020 00:12:45 GMT",
"version": "v1"
},
{
"created": "Sun, 28 Jun 2020 15:43:25 GMT",
"version": "v2"
},
{
"created": "Wed, 2 Sep 2020 21:10:46 GMT",
"version": "v3"
}
] |
2021-05-13
|
[
[
"Cardozo",
"Jonathan",
""
],
[
"Muñoz",
"J. H.",
""
],
[
"Quintero",
"Nestor",
""
],
[
"Rojas",
"Eduardo",
""
]
] |
Experimental measurements collected by the BABAR, Belle, and LHCb experiments on different observables associated with the semileptonic transition $b \to c \tau \bar{\nu}_\tau$, indicate the existence of disagreement respect with the Standard Model predictions. We analyse the charged scalar boson contributions to these charged-current $B$ meson anomalies within the framework of two Higgs doublet model with the most general Yukawa couplings to quarks and leptons from the third generation, involving left-handed and right-handed (sterile) neutrinos. We perform a phenomenological study of the Yukawa couplings parameter space that accommodates these anomalies. We consider the most recent data from HFLAV world-average and Belle combination, and the upper limits ${\rm BR}(B_c^- \to \tau^- \bar{\nu}_{\tau}) < 30\%$ and $10\%$. In addition, we include in our study the prospect measurements on $R(D^{(\ast)})$ that the Belle II experiment could achieve and explore, for the first time, the future implications for the corresponding charged scalar Yukawa couplings. This analysis updates the existing literature and includes new important observables. Our results show that current experimental $b\rightarrow c \tau \bar{\nu}_\tau$ data and Belle II projection favor the interpretation of a charged scalar boson interacting with right-handed neutrinos. Furthermore, as a side analysis regarding the charged scalar boson interpretation, we revisit the relation between $R(D^\ast)$ and ${\rm BR}(B_c^- \to \tau^- \bar{\nu}_{\tau})$ by investigating whether the claim that pseudoscalar new physics interpretations of $R(D^{\ast})$ are implausible due to the $B_c$ lifetime is still valid, to the light of the recent data and Belle II prospects on $R(D^{\ast})$. Lastly, we reexamine addressing the $R(D^{(\ast)})$ anomalies in the context of the 2HDM of Type II.
|
hep-ph/0401028
|
Hirotsugu Fujii
|
H. Fujii (U Tokyo, Komaba) and M. Ohtani (RIKEN)
|
Soft Modes at the Critical End Point in the Chiral Effective Models
|
8 pages, 6 figures, ptptex, Talk at Finite Density QCD at Nara,
Japan, 10-12 July 2003
|
Prog.Theor.Phys.Suppl.153:157-164,2004
|
10.1143/PTPS.153.157
|
UT-Komaba/03-20
|
hep-ph
| null |
At the critical end point in QCD phase diagram, the scalar, vector and
entropy susceptibilities are known to diverge. The dynamic origin of this
divergence is identified within the chiral effective models as softening of a
hydrodynamic mode of the particle-hole--type motion, which is a consequence of
the conservation law of the baryon number and the energy.
|
[
{
"created": "Wed, 7 Jan 2004 09:47:23 GMT",
"version": "v1"
},
{
"created": "Fri, 20 Feb 2004 07:01:59 GMT",
"version": "v2"
}
] |
2009-09-29
|
[
[
"Fujii",
"H.",
"",
"U Tokyo, Komaba"
],
[
"Ohtani",
"M.",
"",
"RIKEN"
]
] |
At the critical end point in QCD phase diagram, the scalar, vector and entropy susceptibilities are known to diverge. The dynamic origin of this divergence is identified within the chiral effective models as softening of a hydrodynamic mode of the particle-hole--type motion, which is a consequence of the conservation law of the baryon number and the energy.
|
2205.08553
|
Lingfeng Li
|
Huajie Cheng, Wen Han Chiu, Yaquan Fang, Yu Gao, Jiayin Gu, Gang Li,
Lingfeng Li, Tianjun Li, Zhijun Liang, Bo Liu, Jia Liu, Zhen Liu, Manqi Ruan,
Jing Shu, Kechen Wang, Lian-Tao Wang, Ke-Pan Xie, Shuo Yang, Jiarong Yuan,
Kaili Zhang, Mengchao Zhang, Yang Zhang, Xuai Zhuang
|
The Physics potential of the CEPC. Prepared for the US Snowmass
Community Planning Exercise (Snowmass 2021)
|
Updated author list
| null | null | null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
The Circular Electron Positron Collider (CEPC) is a large-scale collider
facility that can serve as a factory of the Higgs, Z, and W bosons and is
upgradable to run at the ttbar threshold. This document describes the latest
CEPC nominal operation scenario and particle yields and updates the
corresponding physics potential. A new detector concept is also briefly
described. This submission is for consideration by the Snowmass process.
|
[
{
"created": "Tue, 17 May 2022 18:00:05 GMT",
"version": "v1"
},
{
"created": "Mon, 8 Apr 2024 14:14:50 GMT",
"version": "v2"
}
] |
2024-04-09
|
[
[
"Cheng",
"Huajie",
""
],
[
"Chiu",
"Wen Han",
""
],
[
"Fang",
"Yaquan",
""
],
[
"Gao",
"Yu",
""
],
[
"Gu",
"Jiayin",
""
],
[
"Li",
"Gang",
""
],
[
"Li",
"Lingfeng",
""
],
[
"Li",
"Tianjun",
""
],
[
"Liang",
"Zhijun",
""
],
[
"Liu",
"Bo",
""
],
[
"Liu",
"Jia",
""
],
[
"Liu",
"Zhen",
""
],
[
"Ruan",
"Manqi",
""
],
[
"Shu",
"Jing",
""
],
[
"Wang",
"Kechen",
""
],
[
"Wang",
"Lian-Tao",
""
],
[
"Xie",
"Ke-Pan",
""
],
[
"Yang",
"Shuo",
""
],
[
"Yuan",
"Jiarong",
""
],
[
"Zhang",
"Kaili",
""
],
[
"Zhang",
"Mengchao",
""
],
[
"Zhang",
"Yang",
""
],
[
"Zhuang",
"Xuai",
""
]
] |
The Circular Electron Positron Collider (CEPC) is a large-scale collider facility that can serve as a factory of the Higgs, Z, and W bosons and is upgradable to run at the ttbar threshold. This document describes the latest CEPC nominal operation scenario and particle yields and updates the corresponding physics potential. A new detector concept is also briefly described. This submission is for consideration by the Snowmass process.
|
1309.3805
|
Jos\'e Francisco Zurita
|
Florian Goertz, Andreas Papaefstathiou, Li Lin Yang and Jos\'e Zurita
|
Measuring the Higgs boson self-coupling at the LHC using ratios of cross
sections
|
4 pages, 2 figures, to appear in the proceedings of the 25th
"Rencontres de Blois", Blois, France, May 27-31, 2013
| null | null | null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We consider the ratio between the double and single Higgs production cross
sections and examine the prospect of measuring the trilinear Higgs
self-coupling using this observable. Such a ratio has a reduced theoretical
(scale) uncertainty than the double Higgs cross section. We find that with
600/fb, the 14 TeV LHC can constraint the trilinear Higgs self coupling to be
positive, and with 3000/fb one could measure it with a +30 % {-20 %}) accuracy.
|
[
{
"created": "Sun, 15 Sep 2013 23:44:44 GMT",
"version": "v1"
}
] |
2013-09-17
|
[
[
"Goertz",
"Florian",
""
],
[
"Papaefstathiou",
"Andreas",
""
],
[
"Yang",
"Li Lin",
""
],
[
"Zurita",
"José",
""
]
] |
We consider the ratio between the double and single Higgs production cross sections and examine the prospect of measuring the trilinear Higgs self-coupling using this observable. Such a ratio has a reduced theoretical (scale) uncertainty than the double Higgs cross section. We find that with 600/fb, the 14 TeV LHC can constraint the trilinear Higgs self coupling to be positive, and with 3000/fb one could measure it with a +30 % {-20 %}) accuracy.
|
1910.09269
|
Suchismita Sahoo
|
Suchismita Sahoo, Rukmani Mohanta
|
Investigating the role of new physics in $b \to c \tau \bar \nu_\tau$
transitions
|
40 pages, 24 figures
| null | null | null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
In recent times, the charged-current mediated semileptonic $b \to c \tau \bar
\nu_\tau$ processes have attracted a lot of attention after the observation of
lepton non-universality ratios, $R_{D^{(*)}}$, $R_{J/\psi}$ and the
measurements on $D^*$ and $\tau$ longitudinal polarization fractions in $\bar
B\to D^* \tau \bar \nu_\tau$ processes. We present a model-independent analysis
of $ \bar B\to D^{(*)} \tau \bar \nu_\tau$, $ B_s\to D_s^{(*)} \tau \bar
\nu_\tau$, $ B_c^+ \to (\eta_c, J/\psi) \tau^+ \nu_\tau$, $\Lambda_b \to
\Lambda_c \tau \bar \nu_\tau$ and $\bar B \to D^{**} \tau \bar \nu_\tau$ (where
$D^{**} = \{D^*_0, D_1^*, D_1, D_2^*\}$ are the four lightest excited charm
mesons) processes involving $b \to c \tau \bar \nu$ quark level transitions by
considering the most general effective Lagrangian in the presence of new
physics. We perform a global fit to various set of new coefficients, including
the measurements on $R_{D^{(*)}}$, $R_{J/\psi}$ and the upper limit on
Br($B_c^+ \to \tau^+ \bar \nu_\tau$). We then show the implications of
constrained new couplings on the branching fractions, lepton non-universality
ratios and various angular observables of these decay modes in four different
bins of $q^2$.
|
[
{
"created": "Mon, 21 Oct 2019 11:43:19 GMT",
"version": "v1"
}
] |
2019-10-22
|
[
[
"Sahoo",
"Suchismita",
""
],
[
"Mohanta",
"Rukmani",
""
]
] |
In recent times, the charged-current mediated semileptonic $b \to c \tau \bar \nu_\tau$ processes have attracted a lot of attention after the observation of lepton non-universality ratios, $R_{D^{(*)}}$, $R_{J/\psi}$ and the measurements on $D^*$ and $\tau$ longitudinal polarization fractions in $\bar B\to D^* \tau \bar \nu_\tau$ processes. We present a model-independent analysis of $ \bar B\to D^{(*)} \tau \bar \nu_\tau$, $ B_s\to D_s^{(*)} \tau \bar \nu_\tau$, $ B_c^+ \to (\eta_c, J/\psi) \tau^+ \nu_\tau$, $\Lambda_b \to \Lambda_c \tau \bar \nu_\tau$ and $\bar B \to D^{**} \tau \bar \nu_\tau$ (where $D^{**} = \{D^*_0, D_1^*, D_1, D_2^*\}$ are the four lightest excited charm mesons) processes involving $b \to c \tau \bar \nu$ quark level transitions by considering the most general effective Lagrangian in the presence of new physics. We perform a global fit to various set of new coefficients, including the measurements on $R_{D^{(*)}}$, $R_{J/\psi}$ and the upper limit on Br($B_c^+ \to \tau^+ \bar \nu_\tau$). We then show the implications of constrained new couplings on the branching fractions, lepton non-universality ratios and various angular observables of these decay modes in four different bins of $q^2$.
|
0704.1720
|
Mikko Laine
|
M. Laine
|
A resummed perturbative estimate for the quarkonium spectral function in
hot QCD
|
16 pages. v2: misprint fixed, minor additions
|
JHEP 0705:028,2007
|
10.1088/1126-6708/2007/05/028
| null |
hep-ph hep-lat
| null |
By making use of the finite-temperature real-time static potential that was
introduced and computed to leading non-trivial order in Hard Thermal Loop
resummed perturbation theory in recent work, and solving numerically a
Schr\"odinger-type equation, we estimate the quarkonium (in practice,
bottomonium) contribution to the spectral function of the electromagnetic
current in hot QCD. The spectral function shows a single resonance peak which
becomes wider and then disappears as the temperature is increased beyond 450
MeV or so. This behaviour can be compared with recently attempted lattice
reconstructions of the same quantity, based on the ``maximum entropy method'',
which generically show several peaks. We also specify the dependence of our
results on the spatial momentum of the electromagnetic current, as well as on
the baryon chemical potential characterising the hot QCD plasma.
|
[
{
"created": "Fri, 13 Apr 2007 18:26:59 GMT",
"version": "v1"
},
{
"created": "Tue, 12 Jun 2007 13:24:22 GMT",
"version": "v2"
}
] |
2009-11-13
|
[
[
"Laine",
"M.",
""
]
] |
By making use of the finite-temperature real-time static potential that was introduced and computed to leading non-trivial order in Hard Thermal Loop resummed perturbation theory in recent work, and solving numerically a Schr\"odinger-type equation, we estimate the quarkonium (in practice, bottomonium) contribution to the spectral function of the electromagnetic current in hot QCD. The spectral function shows a single resonance peak which becomes wider and then disappears as the temperature is increased beyond 450 MeV or so. This behaviour can be compared with recently attempted lattice reconstructions of the same quantity, based on the ``maximum entropy method'', which generically show several peaks. We also specify the dependence of our results on the spatial momentum of the electromagnetic current, as well as on the baryon chemical potential characterising the hot QCD plasma.
|
2110.15698
|
Manuel Gonzalez-Lopez
|
Manuel Gonz\'alez-L\'opez
|
Neutrino Masses and Hubble Tension via a Majoron in MFV
|
4 pages, 1 figure. Contribution to the proceedings of the European
Physical Society Conference on High Energy Physics (EPS-HEP2021), 26-30 July
2021
| null | null | null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
The recent tension between local and early measurements of the Hubble
constant can be explained in a particle physics context. A mechanism is
presented where this tension is alleviated due to the presence of a Majoron,
arising from the spontaneous breaking of Lepton Number. The lightness of the
active neutrinos is consistently explained. Moreover, this mechanism is shown
to be embeddable in the Minimal (Lepton) Flavour Violating context, providing a
correct description of fermion masses and mixings, and protecting the flavour
sector from large deviations from the Standard Model predictions. A QCD axion
is also present to solve the Strong CP problem. The Lepton Number and the
Peccei-Quinn symmetries naturally arise in the Minimal (Lepton) Flavour
Violating setup and their spontaneous breaking is due to the presence of two
extra scalar singlets. The Majoron phenomenology is also studied in detail.
Decays of the heavy neutrinos and the invisible Higgs decay provide the
strongest constraints in the model parameter space.
|
[
{
"created": "Fri, 29 Oct 2021 11:49:34 GMT",
"version": "v1"
}
] |
2021-11-01
|
[
[
"González-López",
"Manuel",
""
]
] |
The recent tension between local and early measurements of the Hubble constant can be explained in a particle physics context. A mechanism is presented where this tension is alleviated due to the presence of a Majoron, arising from the spontaneous breaking of Lepton Number. The lightness of the active neutrinos is consistently explained. Moreover, this mechanism is shown to be embeddable in the Minimal (Lepton) Flavour Violating context, providing a correct description of fermion masses and mixings, and protecting the flavour sector from large deviations from the Standard Model predictions. A QCD axion is also present to solve the Strong CP problem. The Lepton Number and the Peccei-Quinn symmetries naturally arise in the Minimal (Lepton) Flavour Violating setup and their spontaneous breaking is due to the presence of two extra scalar singlets. The Majoron phenomenology is also studied in detail. Decays of the heavy neutrinos and the invisible Higgs decay provide the strongest constraints in the model parameter space.
|
0910.1196
|
Errol Gotsman
|
Uri Maor
|
Soft Scattering Re - Visited
|
8 pages, 1 figure, eds09 conference, CERN June 2009
| null | null | null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
An updated formulation of soft diffraction, compatible with $s$ and $t$
channel unitarity, is presented. Its consequent general soft scattering
features at high energies are explored. The critical interplay between theory
and data analysis and its consequent implications with regards to the
theoretical foundations of soft scattering theory are discussed.
|
[
{
"created": "Wed, 7 Oct 2009 09:26:08 GMT",
"version": "v1"
}
] |
2009-10-08
|
[
[
"Maor",
"Uri",
""
]
] |
An updated formulation of soft diffraction, compatible with $s$ and $t$ channel unitarity, is presented. Its consequent general soft scattering features at high energies are explored. The critical interplay between theory and data analysis and its consequent implications with regards to the theoretical foundations of soft scattering theory are discussed.
|
2006.15044
|
Alessandro Pilloni
|
Angelo Esposito, Elena G. Ferreiro, Alessandro Pilloni, Antonio D.
Polosa, Carlos A. Salgado
|
The nature of $X(3872)$ from high-multiplicity $pp$ collisions
|
11 pages, 6 figures. Presentation updated, references added,
conclusions unchanged. Version accepted in EPJC
|
Eur. Phys. J. C 81, 669 (2021)
|
10.1140/epjc/s10052-021-09425-w
| null |
hep-ph nucl-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
The structure of exotic resonances that do not trivially fit the usual quark
model expectations has been a matter of intense scientific debate during the
last two decades. A possible way of estimating the size of these states is to
study their behavior when immersed in QCD matter. Recently, LHCb has measured
the relative abundance of the exotic $X(3872)$ over the ordinary $\psi(2S)$. We
use the comover interaction model to study the yield of a compact $X(3872)$. To
confirm the reliability of the model in high-multiplicity $pp$ collisions, we
describe the suppression of excited over ground $\Upsilon$ states. With this at
hand, we show that the size of the compact $X(3872)$ would be slightly larger
than that of the $\psi(2S)$. If the $X(3872)$ is instead assumed to be a meson
molecule of large size, we argue that its evolution in QCD matter should be
described via a coalescence model, as suggested by data on deuteron production.
We show that the predictions of this model for the $X(3872)$ are in contrast
with data.
|
[
{
"created": "Fri, 26 Jun 2020 15:21:27 GMT",
"version": "v1"
},
{
"created": "Thu, 8 Jul 2021 13:08:04 GMT",
"version": "v2"
}
] |
2021-08-02
|
[
[
"Esposito",
"Angelo",
""
],
[
"Ferreiro",
"Elena G.",
""
],
[
"Pilloni",
"Alessandro",
""
],
[
"Polosa",
"Antonio D.",
""
],
[
"Salgado",
"Carlos A.",
""
]
] |
The structure of exotic resonances that do not trivially fit the usual quark model expectations has been a matter of intense scientific debate during the last two decades. A possible way of estimating the size of these states is to study their behavior when immersed in QCD matter. Recently, LHCb has measured the relative abundance of the exotic $X(3872)$ over the ordinary $\psi(2S)$. We use the comover interaction model to study the yield of a compact $X(3872)$. To confirm the reliability of the model in high-multiplicity $pp$ collisions, we describe the suppression of excited over ground $\Upsilon$ states. With this at hand, we show that the size of the compact $X(3872)$ would be slightly larger than that of the $\psi(2S)$. If the $X(3872)$ is instead assumed to be a meson molecule of large size, we argue that its evolution in QCD matter should be described via a coalescence model, as suggested by data on deuteron production. We show that the predictions of this model for the $X(3872)$ are in contrast with data.
|
2009.07276
|
Jason Aebischer
|
Jason Aebischer, Christoph Bobeth, Andrzej J. Buras and Jacky Kumar
|
SMEFT ATLAS of $\Delta F=2$ Transitions
|
76 pages, 13 figures
| null |
10.1007/JHEP12(2020)187
| null |
hep-ph hep-ex hep-lat
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We present a model-independent anatomy of the $\Delta F=2$ transitions
$K^0-\bar K^0$, $B_{s,d}-\bar B_{s,d}$ and $D^0-\bar D^0$ in the context of the
Standard Model Effective Field Theory (SMEFT). We present two master formulae
for the mixing amplitude $\big[M_{12} \big]_\text{BSM}$. One in terms of the
Wilson coefficients (WCs) of the Low-Energy Effective Theory (LEFT) operators
evaluated at the electroweak scale $\mu_\text{ew}$ and one in terms of the WCs
of the SMEFT operators evaluated at the BSM scale $\Lambda$. The coefficients
$P_a^{ij}$ entering these formulae contain all the information below the scales
$\mu_\text{ew}$ and $\Lambda$, respectively. Renormalization group effects from
the top-quark Yukawa coupling play the most important role. The collection of
the individual contributions of the SMEFT operators to
$\big[M_{12}\big]_\text{BSM}$ can be considered as the SMEFT ATLAS of $\Delta
F=2$ transitions and constitutes a travel guide to such transitions far beyond
the scales explored by the LHC. We emphasize that this ATLAS depends on whether
the down-basis or the up-basis for SMEFT operators is considered. We illustrate
this technology with tree-level exchanges of heavy gauge bosons ($Z^\prime$,
$G^\prime$) and corresponding heavy scalars.
|
[
{
"created": "Tue, 15 Sep 2020 18:00:00 GMT",
"version": "v1"
}
] |
2021-02-03
|
[
[
"Aebischer",
"Jason",
""
],
[
"Bobeth",
"Christoph",
""
],
[
"Buras",
"Andrzej J.",
""
],
[
"Kumar",
"Jacky",
""
]
] |
We present a model-independent anatomy of the $\Delta F=2$ transitions $K^0-\bar K^0$, $B_{s,d}-\bar B_{s,d}$ and $D^0-\bar D^0$ in the context of the Standard Model Effective Field Theory (SMEFT). We present two master formulae for the mixing amplitude $\big[M_{12} \big]_\text{BSM}$. One in terms of the Wilson coefficients (WCs) of the Low-Energy Effective Theory (LEFT) operators evaluated at the electroweak scale $\mu_\text{ew}$ and one in terms of the WCs of the SMEFT operators evaluated at the BSM scale $\Lambda$. The coefficients $P_a^{ij}$ entering these formulae contain all the information below the scales $\mu_\text{ew}$ and $\Lambda$, respectively. Renormalization group effects from the top-quark Yukawa coupling play the most important role. The collection of the individual contributions of the SMEFT operators to $\big[M_{12}\big]_\text{BSM}$ can be considered as the SMEFT ATLAS of $\Delta F=2$ transitions and constitutes a travel guide to such transitions far beyond the scales explored by the LHC. We emphasize that this ATLAS depends on whether the down-basis or the up-basis for SMEFT operators is considered. We illustrate this technology with tree-level exchanges of heavy gauge bosons ($Z^\prime$, $G^\prime$) and corresponding heavy scalars.
|
hep-ph/9411208
| null |
Rathin Adhikari and Biswarup Mukhopadhyaya
|
Can We Identify a Light Neutralino in B-Factories
|
14 pages, 5 figures (hard copies available from authors on request)
|
Phys.Lett. B353 (1995) 228-233
|
10.1016/0370-2693(95)00560-8
|
MRI-PHY/19/94
|
hep-ph
| null |
If a light gaugino sector exists, then the lightest supersymmetric particle
(LSP) has a chance of being pair-produced in rare B-decays. As a consequence of
neutral flavour violation in most supersymmetric models, such decays can occur
at the tree-level and reinforce the channels $B \longrightarrow K(K^{*}) +
invisible$. We discuss how a study of such decay spectra in B-factories can
help us either identify or exclude a light LSP.
|
[
{
"created": "Wed, 2 Nov 1994 15:23:04 GMT",
"version": "v1"
}
] |
2009-10-28
|
[
[
"Adhikari",
"Rathin",
""
],
[
"Mukhopadhyaya",
"Biswarup",
""
]
] |
If a light gaugino sector exists, then the lightest supersymmetric particle (LSP) has a chance of being pair-produced in rare B-decays. As a consequence of neutral flavour violation in most supersymmetric models, such decays can occur at the tree-level and reinforce the channels $B \longrightarrow K(K^{*}) + invisible$. We discuss how a study of such decay spectra in B-factories can help us either identify or exclude a light LSP.
|
2005.02548
|
Douglas Gingrich Mr.
|
Douglas M. Gingrich and Brennan Undseth
|
Quantum black holes in the horizon quantum mechanics model at the Large
Hadron Collider
|
To be published in Phys. Rev. D
|
Phys. Rev. D 102, 095020 (2020)
|
10.1103/PhysRevD.102.095020
| null |
hep-ph gr-qc hep-ex hep-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Quantum black hole production at the Large Hadron Collider is investigated
using the horizon quantum mechanics model. This model has novel implications
for how black holes might be observed in collider experiments. Black hole
production is predicted to be possible below the Planck scale, thus leading to
the intriguing possibility that black holes could be produced even if the
Planck scale is slightly above the collider centre of mass energy. In addition,
the usual anticipated resonance in the black hole mass distribution is
significantly widened in this model. For values of the Planck scale above the
current lower limits, the shape of the black hole mass distribution is almost
independent of the Planck scale and depends more on the number of extra
dimensions. These model features suggest the need for alternative search
strategies in collider experiments.
|
[
{
"created": "Wed, 6 May 2020 01:12:32 GMT",
"version": "v1"
},
{
"created": "Tue, 27 Oct 2020 01:50:18 GMT",
"version": "v2"
}
] |
2020-11-25
|
[
[
"Gingrich",
"Douglas M.",
""
],
[
"Undseth",
"Brennan",
""
]
] |
Quantum black hole production at the Large Hadron Collider is investigated using the horizon quantum mechanics model. This model has novel implications for how black holes might be observed in collider experiments. Black hole production is predicted to be possible below the Planck scale, thus leading to the intriguing possibility that black holes could be produced even if the Planck scale is slightly above the collider centre of mass energy. In addition, the usual anticipated resonance in the black hole mass distribution is significantly widened in this model. For values of the Planck scale above the current lower limits, the shape of the black hole mass distribution is almost independent of the Planck scale and depends more on the number of extra dimensions. These model features suggest the need for alternative search strategies in collider experiments.
|
2105.06835
|
Anthony Palladino
|
G. M. Piacentino, A. Palladino, R. N. Pilato, G. Venanzoni, L. Conti,
G. Di Sciacio, R. Di Stefano, N. Fratianni, A. Gioiosa, D. Hajdukovic, F.
Ignatov, F. Marignetti, V. Testa
|
An Experiment Exploring Gravitational Effects on CP Violation
|
Contribution to the 2021 Gravitation session of the 55th Rencontres
de Moriond
| null | null | null |
hep-ph astro-ph.HE astro-ph.IM gr-qc hep-ex
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We suggest a new experiment sensitive to a possible difference between the
amount of CP violation as measured on the surface of the Earth and in a lower
gravity environment. Our proposed experiment is model independent and could
yield a $5\sigma$ measurement within tens of days, indicating a dependence of
the level of CP violation in the neutral kaon system on the local gravitational
potential.
|
[
{
"created": "Fri, 14 May 2021 13:51:20 GMT",
"version": "v1"
}
] |
2021-05-17
|
[
[
"Piacentino",
"G. M.",
""
],
[
"Palladino",
"A.",
""
],
[
"Pilato",
"R. N.",
""
],
[
"Venanzoni",
"G.",
""
],
[
"Conti",
"L.",
""
],
[
"Di Sciacio",
"G.",
""
],
[
"Di Stefano",
"R.",
""
],
[
"Fratianni",
"N.",
""
],
[
"Gioiosa",
"A.",
""
],
[
"Hajdukovic",
"D.",
""
],
[
"Ignatov",
"F.",
""
],
[
"Marignetti",
"F.",
""
],
[
"Testa",
"V.",
""
]
] |
We suggest a new experiment sensitive to a possible difference between the amount of CP violation as measured on the surface of the Earth and in a lower gravity environment. Our proposed experiment is model independent and could yield a $5\sigma$ measurement within tens of days, indicating a dependence of the level of CP violation in the neutral kaon system on the local gravitational potential.
|
1212.5978
|
Dao-Neng Gao
|
Dao-Neng Gao and Xian-Fu Wang
|
On the angular distributions of tau- --> K_S pi-nu_tau decay
|
10 pages, 2 figures. Typos corrected, some remarks and references
added. Publised version
|
Phys. Rev. D 87, 073016 (2013)
|
10.1103/PhysRevD.87.073016
|
USTC-ICTS-12-17
|
hep-ph hep-ex
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Based on experimental data by the Bell Collaboration, we present a
phenomenological analysis of the angular distributions in tau- -->K_S pi-nu_tau
decay. Our study shows that the angular analysis could lead to some interesting
observables, and the future experimental investigation of these observables
might be very helpful in revealing the nature of the scalar components of the
decay. New physics contributions from the two-Higgs-doublet model to this decay
have also been examined.
|
[
{
"created": "Tue, 25 Dec 2012 00:53:10 GMT",
"version": "v1"
},
{
"created": "Mon, 31 Dec 2012 10:27:16 GMT",
"version": "v2"
},
{
"created": "Thu, 2 May 2013 02:52:00 GMT",
"version": "v3"
}
] |
2013-05-03
|
[
[
"Gao",
"Dao-Neng",
""
],
[
"Wang",
"Xian-Fu",
""
]
] |
Based on experimental data by the Bell Collaboration, we present a phenomenological analysis of the angular distributions in tau- -->K_S pi-nu_tau decay. Our study shows that the angular analysis could lead to some interesting observables, and the future experimental investigation of these observables might be very helpful in revealing the nature of the scalar components of the decay. New physics contributions from the two-Higgs-doublet model to this decay have also been examined.
|
1912.10054
|
Isabel Garcia Garcia
|
Nathaniel Craig, Isabel Garcia Garcia, and Graham D. Kribs
|
The UV Fate of Anomalous $U(1)$s and the Swampland
|
25 pages, 7 figures; v2: extended introduction
| null |
10.1007/JHEP11(2020)063
| null |
hep-ph hep-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Massive $U(1)$ gauge theories featuring parametrically light vectors are
suspected to belong in the Swampland of consistent EFTs that cannot be embedded
into a theory of quantum gravity. We study four-dimensional, chiral $U(1)$
gauge theories that appear anomalous over a range of energies up to the scale
of anomaly-cancelling massive chiral fermions. We show that such theories
require to be UV-completed at a finite cutoff below which a radial mode must
appear, and cannot be decoupled -- a St\"uckelberg limit does not exist. When
the infrared fermion spectrum contains a mixed $U(1)$-gravitational anomaly,
this class of theories provides a toy model of a boundary into the Swampland,
for sufficiently small values of the vector mass. In this context, we show that
the limit of a parametrically light vector comes at the cost of a quantum
gravity scale that lies parametrically below $M_{Pl}$, and our result provides
field theoretic evidence for the existence of a Swampland of EFTs that is
disconnected from the subset of theories compatible with a gravitational
UV-completion. Moreover, when the low energy theory also contains a $U(1)^3$
anomaly, the Weak Gravity Conjecture scale makes an appearance in the form of a
quantum gravity cutoff for values of the gauge coupling above a certain
critical size.
|
[
{
"created": "Fri, 20 Dec 2019 19:00:10 GMT",
"version": "v1"
},
{
"created": "Tue, 23 Jun 2020 18:02:23 GMT",
"version": "v2"
}
] |
2020-12-02
|
[
[
"Craig",
"Nathaniel",
""
],
[
"Garcia",
"Isabel Garcia",
""
],
[
"Kribs",
"Graham D.",
""
]
] |
Massive $U(1)$ gauge theories featuring parametrically light vectors are suspected to belong in the Swampland of consistent EFTs that cannot be embedded into a theory of quantum gravity. We study four-dimensional, chiral $U(1)$ gauge theories that appear anomalous over a range of energies up to the scale of anomaly-cancelling massive chiral fermions. We show that such theories require to be UV-completed at a finite cutoff below which a radial mode must appear, and cannot be decoupled -- a St\"uckelberg limit does not exist. When the infrared fermion spectrum contains a mixed $U(1)$-gravitational anomaly, this class of theories provides a toy model of a boundary into the Swampland, for sufficiently small values of the vector mass. In this context, we show that the limit of a parametrically light vector comes at the cost of a quantum gravity scale that lies parametrically below $M_{Pl}$, and our result provides field theoretic evidence for the existence of a Swampland of EFTs that is disconnected from the subset of theories compatible with a gravitational UV-completion. Moreover, when the low energy theory also contains a $U(1)^3$ anomaly, the Weak Gravity Conjecture scale makes an appearance in the form of a quantum gravity cutoff for values of the gauge coupling above a certain critical size.
|
1304.7752
|
Shuzhe Shi
|
Shuzhe Shi, Jinfeng Liao
|
Conserved Charge Fluctuations and Susceptibilities in Strongly
Interacting Matter
|
24 pages, 12 figures, new references included
|
JHEP 06 (2013) 104
|
10.1007/JHEP06(2013)104
|
RBRC-1017
|
hep-ph hep-lat hep-th nucl-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We study the conserved charge fluctuations, as quantified by the
corresponding susceptibilities, in strongly interacting matter as motived by
the quark-gluon plasma. Using the gauge-gravity correspondence approach, we
study the patterns of conserved charge fluctuations in two types of holographic
models for QCD, the D4/D8 and the D3/D7 models. We compute and compare the
quark number susceptibilities in both models and find an interesting common
feature of the two: at very strong coupling higher order susceptibilities are
suppressed and the conserved charge fluctuations become purely Guassian. In
light of the state-of-the-art lattice QCD results we also discuss what we can
learn from these susceptibilities about the underlying degrees of freedom in
the $1\sim 2T_c$ quark-gluon plasma and examine the viability of different
ideas such as holography, quasi-particles, as well as bound states. From
analyzes of second order susceptibilities we conclude that the bound states
exist and are important in the $1\sim 2T_c$ region. We further construct and
make predictions for several ratios of fourth-order susceptibilities that can
sensitively reveal such bound states.
|
[
{
"created": "Mon, 29 Apr 2013 19:35:05 GMT",
"version": "v1"
},
{
"created": "Sat, 22 Jun 2013 01:53:51 GMT",
"version": "v2"
},
{
"created": "Thu, 4 Jul 2013 13:43:21 GMT",
"version": "v3"
}
] |
2013-07-05
|
[
[
"Shi",
"Shuzhe",
""
],
[
"Liao",
"Jinfeng",
""
]
] |
We study the conserved charge fluctuations, as quantified by the corresponding susceptibilities, in strongly interacting matter as motived by the quark-gluon plasma. Using the gauge-gravity correspondence approach, we study the patterns of conserved charge fluctuations in two types of holographic models for QCD, the D4/D8 and the D3/D7 models. We compute and compare the quark number susceptibilities in both models and find an interesting common feature of the two: at very strong coupling higher order susceptibilities are suppressed and the conserved charge fluctuations become purely Guassian. In light of the state-of-the-art lattice QCD results we also discuss what we can learn from these susceptibilities about the underlying degrees of freedom in the $1\sim 2T_c$ quark-gluon plasma and examine the viability of different ideas such as holography, quasi-particles, as well as bound states. From analyzes of second order susceptibilities we conclude that the bound states exist and are important in the $1\sim 2T_c$ region. We further construct and make predictions for several ratios of fourth-order susceptibilities that can sensitively reveal such bound states.
|
2205.08205
|
Wei Liu
|
Wei Liu, Aigeng Yang, Hao Sun
|
Shedding light on the electroweak phase transition from exotic Higgs
boson decays at the lifetime frontiers
|
14 pages, 7 figures, to be published in PRD
| null |
10.1103/PhysRevD.105.115040
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We study the scenarios where a strongly first-order electroweak phase
transition (EWPT) is triggered by a light singlet scalar, which has feeble
interactions to the Higgs. Since the singlet scalar is light and has weak
couplings, it can decay at a macroscopic distance away from the collision
point. Therefore, it can be regarded as a long-lived particles (LLP) in such
scenarios. We perform the searches of the LLPs from the exotic Higgs decays, at
the FASER, MAPP and CMS-Timing detectors of the 14 TeV HL-LHC, to probe the
strongly first-order EWPT. In certain scenarios, we show that the LLP searches
can help to reach the parameter space of the strongly first-order EWPT
remarkably, where the searches for promptly exotic Higgs decays are not valid.
|
[
{
"created": "Tue, 17 May 2022 10:02:21 GMT",
"version": "v1"
},
{
"created": "Thu, 23 Jun 2022 01:35:22 GMT",
"version": "v2"
}
] |
2022-07-13
|
[
[
"Liu",
"Wei",
""
],
[
"Yang",
"Aigeng",
""
],
[
"Sun",
"Hao",
""
]
] |
We study the scenarios where a strongly first-order electroweak phase transition (EWPT) is triggered by a light singlet scalar, which has feeble interactions to the Higgs. Since the singlet scalar is light and has weak couplings, it can decay at a macroscopic distance away from the collision point. Therefore, it can be regarded as a long-lived particles (LLP) in such scenarios. We perform the searches of the LLPs from the exotic Higgs decays, at the FASER, MAPP and CMS-Timing detectors of the 14 TeV HL-LHC, to probe the strongly first-order EWPT. In certain scenarios, we show that the LLP searches can help to reach the parameter space of the strongly first-order EWPT remarkably, where the searches for promptly exotic Higgs decays are not valid.
|
hep-ph/0509073
|
Igor Shovkovy
|
Stefan B. Ruester, Verena Werth, Michael Buballa, Igor A. Shovkovy,
Dirk H. Rischke
|
The phase diagram of neutral quark matter: The effect of neutrino
trapping
|
10 pages, 9 figures, references added; version accepted for
publication in Phys. Rev. D
|
Phys.Rev.D73:034025,2006
|
10.1103/PhysRevD.73.034025
| null |
hep-ph astro-ph nucl-th
| null |
We study the effect of neutrino trapping on the phase diagram of dense,
locally neutral three-flavor quark matter within the framework of a
Nambu--Jona-Lasinio model. In the analysis, dynamically generated quark masses
are taken into account self-consistently. The phase diagrams in the plane of
temperature and quark chemical potential, as well as in the plane of
temperature and lepton-number chemical potential are presented. We show that
neutrino trapping favors two-flavor color superconductivity and disfavors the
color-flavor-locked phase at intermediate densities of matter. At the same
time, the location of the critical line separating the two-flavor
color-superconducting phase and the normal phase of quark matter is little
affected by the presence of neutrinos. The implications of these results for
the evolution of protoneutron stars are briefly discussed.
|
[
{
"created": "Thu, 8 Sep 2005 16:02:40 GMT",
"version": "v1"
},
{
"created": "Tue, 7 Feb 2006 13:25:31 GMT",
"version": "v2"
}
] |
2008-11-26
|
[
[
"Ruester",
"Stefan B.",
""
],
[
"Werth",
"Verena",
""
],
[
"Buballa",
"Michael",
""
],
[
"Shovkovy",
"Igor A.",
""
],
[
"Rischke",
"Dirk H.",
""
]
] |
We study the effect of neutrino trapping on the phase diagram of dense, locally neutral three-flavor quark matter within the framework of a Nambu--Jona-Lasinio model. In the analysis, dynamically generated quark masses are taken into account self-consistently. The phase diagrams in the plane of temperature and quark chemical potential, as well as in the plane of temperature and lepton-number chemical potential are presented. We show that neutrino trapping favors two-flavor color superconductivity and disfavors the color-flavor-locked phase at intermediate densities of matter. At the same time, the location of the critical line separating the two-flavor color-superconducting phase and the normal phase of quark matter is little affected by the presence of neutrinos. The implications of these results for the evolution of protoneutron stars are briefly discussed.
|
hep-ph/0703019
|
Motohiko Yoshimura
|
Toru Takahashi and M. Yoshimura
|
Effect of Relic Neutrino on Neutrino Pair Emission from Metastable Atoms
|
12 pages and 6 figures
| null | null | null |
hep-ph astro-ph hep-ex physics.atom-ph
| null |
A possiblity of measuring the cosmic neutrino temperature $\sim 1.9 K$ and
other important quantities such as the chemical potential $\mu$ and the
decoupling temperature $T_d$ is discussed, using the recently proposed process
of photon irradiated neutrino pair emission from metastable atoms. The Pauli
blocking effect of relic neutrinos reduces the rate by a large factor $\approx
(1 + m_1/T_d)/4$ at the threshold of the lightest neutrino pair (of mass
$2m_1$). Correction of linear order in $\mu$ near the mass thresholds can be
used to improve the constraint on the lepton asymmetry.
|
[
{
"created": "Fri, 2 Mar 2007 07:15:51 GMT",
"version": "v1"
}
] |
2007-05-23
|
[
[
"Takahashi",
"Toru",
""
],
[
"Yoshimura",
"M.",
""
]
] |
A possiblity of measuring the cosmic neutrino temperature $\sim 1.9 K$ and other important quantities such as the chemical potential $\mu$ and the decoupling temperature $T_d$ is discussed, using the recently proposed process of photon irradiated neutrino pair emission from metastable atoms. The Pauli blocking effect of relic neutrinos reduces the rate by a large factor $\approx (1 + m_1/T_d)/4$ at the threshold of the lightest neutrino pair (of mass $2m_1$). Correction of linear order in $\mu$ near the mass thresholds can be used to improve the constraint on the lepton asymmetry.
|
hep-ph/0309333
|
Osamu Yasuda
|
Osamu Yasuda
|
Measurement of $\theta_{13}$ by reactor experiments
|
4 pages, 2 figures, aipproc LaTeX. Talk presented at the 5th
International Workshop on Neutrino Factories & Superbeams (NuFact'03),
Columbia University, New York, USA, June 5-11, 2003
| null |
10.1063/1.1818394
| null |
hep-ph
| null |
I describe how reactor measurements of $\sin^22\theta_{13}$ can be improved
by a near-far detector complex. I show that in the Kashiwazaki plan it is
potentially possible to measure $\sin^2{2\theta_{13}}$ down to 0.02.
|
[
{
"created": "Tue, 30 Sep 2003 08:17:37 GMT",
"version": "v1"
}
] |
2009-11-10
|
[
[
"Yasuda",
"Osamu",
""
]
] |
I describe how reactor measurements of $\sin^22\theta_{13}$ can be improved by a near-far detector complex. I show that in the Kashiwazaki plan it is potentially possible to measure $\sin^2{2\theta_{13}}$ down to 0.02.
|
1810.08228
|
Zeren Simon Wang
|
Florian Domingo, Herbert K. Dreiner, Jong Soo Kim, Manuel E. Krauss,
Victor Martin Lozano, Zeren Simon Wang
|
Updating Bounds on $R$-Parity Violating Supersymmetry from Meson
Oscillation Data
|
53 pages, 10 figures, 2 tables; final version
| null |
10.1007/JHEP02(2019)066
|
BONN-TH-2018-09, IFT-UAM/CSIC-18-103
|
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We update the bounds on $R$-parity violating supersymmetry originating from
meson oscillations in the $B^0_{d/s}$ and $K^0$ systems. To this end, we
explicitly calculate all corresponding contributions from $R$-parity violating
operators at the one-loop level, thereby completing and correcting existing
calculations. We apply our results to the derivation of bounds on $R$-parity
violating couplings, based on up-to-date experimental measurements. In
addition, we consider the possibility of cancellations among flavor-changing
contributions of various origins, e.g. from multiple $R$-parity violating
couplings or $R$-parity conserving soft terms. Destructive interferences among
new-physics contributions could then open phenomenologically allowed regions,
for values of the parameters that are naively excluded when the parameters are
varied individually.
|
[
{
"created": "Thu, 18 Oct 2018 18:32:36 GMT",
"version": "v1"
},
{
"created": "Tue, 26 Feb 2019 14:59:16 GMT",
"version": "v2"
}
] |
2019-03-27
|
[
[
"Domingo",
"Florian",
""
],
[
"Dreiner",
"Herbert K.",
""
],
[
"Kim",
"Jong Soo",
""
],
[
"Krauss",
"Manuel E.",
""
],
[
"Lozano",
"Victor Martin",
""
],
[
"Wang",
"Zeren Simon",
""
]
] |
We update the bounds on $R$-parity violating supersymmetry originating from meson oscillations in the $B^0_{d/s}$ and $K^0$ systems. To this end, we explicitly calculate all corresponding contributions from $R$-parity violating operators at the one-loop level, thereby completing and correcting existing calculations. We apply our results to the derivation of bounds on $R$-parity violating couplings, based on up-to-date experimental measurements. In addition, we consider the possibility of cancellations among flavor-changing contributions of various origins, e.g. from multiple $R$-parity violating couplings or $R$-parity conserving soft terms. Destructive interferences among new-physics contributions could then open phenomenologically allowed regions, for values of the parameters that are naively excluded when the parameters are varied individually.
|
hep-ph/0509063
|
Tomohiro Matsuda
|
Tomohiro Matsuda
|
Topological Curvatons
|
22pages, Latex2e, to appear in PRD
|
Phys.Rev. D72 (2005) 123508
|
10.1103/PhysRevD.72.123508
| null |
hep-ph astro-ph hep-th
| null |
Topological defects may play the role of the curvatons. We propose a new
mechanism of generating density perturbations from cosmological defects in
inflationary models. We show several examples in which defects play crucial
role in generating density perturbations.
|
[
{
"created": "Wed, 7 Sep 2005 11:04:33 GMT",
"version": "v1"
},
{
"created": "Wed, 2 Nov 2005 11:35:42 GMT",
"version": "v2"
},
{
"created": "Sat, 26 Nov 2005 09:59:04 GMT",
"version": "v3"
}
] |
2009-11-11
|
[
[
"Matsuda",
"Tomohiro",
""
]
] |
Topological defects may play the role of the curvatons. We propose a new mechanism of generating density perturbations from cosmological defects in inflationary models. We show several examples in which defects play crucial role in generating density perturbations.
|
2105.04386
|
Jinsu Kim
|
Shinsuke Kawai and Jinsu Kim
|
CMB from a Gauss-Bonnet-induced de Sitter fixed point
|
v1: 12 pages; v2: 13 pages, version accepted for publication in PRD
|
Phys. Rev. D 104, 043525 (2021)
|
10.1103/PhysRevD.104.043525
|
CERN-TH-2021-075
|
hep-ph astro-ph.CO hep-th
|
http://creativecommons.org/licenses/by/4.0/
|
In the gravitational effective theories including higher curvature terms,
cosmological solutions can have nontrivial de Sitter fixed points. We study
phenomenological implications of such points, focusing on a theory in which a
massive scalar field is nonminimally coupled to the Euler density. We first
analyze the phase portrait of the dynamical system and show that the fixed
point can be a sink or a saddle, depending on the strength of the coupling.
Then, we compute the perturbation spectra generated in the vicinity of the
fixed point in order to investigate whether the fixed point may be considered
as cosmic inflation. We find parameter regions that are consistent with the
cosmological data, given that the anisotropies in the cosmic microwave
background are seeded by the fluctuations generated near the fixed point.
Future observation may be used to further constrain the coupling function of
this model. We also comment briefly on the swampland conjecture.
|
[
{
"created": "Mon, 10 May 2021 14:05:36 GMT",
"version": "v1"
},
{
"created": "Mon, 6 Sep 2021 12:30:14 GMT",
"version": "v2"
}
] |
2021-09-07
|
[
[
"Kawai",
"Shinsuke",
""
],
[
"Kim",
"Jinsu",
""
]
] |
In the gravitational effective theories including higher curvature terms, cosmological solutions can have nontrivial de Sitter fixed points. We study phenomenological implications of such points, focusing on a theory in which a massive scalar field is nonminimally coupled to the Euler density. We first analyze the phase portrait of the dynamical system and show that the fixed point can be a sink or a saddle, depending on the strength of the coupling. Then, we compute the perturbation spectra generated in the vicinity of the fixed point in order to investigate whether the fixed point may be considered as cosmic inflation. We find parameter regions that are consistent with the cosmological data, given that the anisotropies in the cosmic microwave background are seeded by the fluctuations generated near the fixed point. Future observation may be used to further constrain the coupling function of this model. We also comment briefly on the swampland conjecture.
|
2201.10778
|
Fei Huang
|
Ai-Chao Wang, Neng-Chang Wei, Fei Huang
|
Analysis of the $\gamma n \to K^+ \Sigma^-(1385)$ photoproduction
|
7 pages, 7 figures. Accepted for publication in PRD
|
Phys. Rev. D 105, 034017 (2022)
|
10.1103/PhysRevD.105.034017
| null |
hep-ph nucl-th
|
http://creativecommons.org/licenses/by/4.0/
|
In our previous work [Phys. Rev. D $\bf{101}$, 074025 (2020)], the
photoproduction $\gamma p \to K^+ \Sigma^0(1385)$ has been investigated within
an effective Lagrangian approach. There, the reaction amplitudes were
constructed by considering the $t$-channel $K$ and $K^\ast(892)$ exchanges,
$s$-channel $N$ contribution, $u$-channel $\Lambda$ exchange, generalized
contact term, and a minimum number of $s$-channel $N$ and $\Delta$ resonance
diagrams. It was found that the inclusion of one of the $N(1895){1/2}^-$,
$\Delta(1900){1/2}^-$, and $\Delta(1930){5/2}^-$ resonances is essential to
reproduce the available differential and total cross-section data for $\gamma p
\to K^+ \Sigma^0(1385)$. In the present work, we employ the same model to study
the photoproduction $\gamma n \to K^+ \Sigma^-(1385)$, with the purpose being
to understand the reaction mechanism and, in particular, to figure out which
one of the $N(1895){1/2}^-$, $\Delta(1900){1/2}^-$, and $\Delta(1930){5/2}^-$
resonances is really capable for a simultaneous description of the data for
both $K^+ \Sigma^0(1385)$ and $K^+ \Sigma^-(1385)$ photoproduction reactions.
The results show that the available data on differential and total cross
sections and photo-beam asymmetries for $\gamma n \to K^+ \Sigma^-(1385)$ can
be reproduced only with the inclusion of the $\Delta(1930){5/2}^-$ resonance
rather than the other two. The generalized contact term and the $t$-channel $K$
exchange are found to dominate the background contributions. The resonance
$\Delta(1930){5/2}^-$ provides the most important contributions in the whole
energy region considered, and it is responsible for the bump structure
exhibited in the total cross sections.
|
[
{
"created": "Wed, 26 Jan 2022 06:56:08 GMT",
"version": "v1"
}
] |
2022-02-22
|
[
[
"Wang",
"Ai-Chao",
""
],
[
"Wei",
"Neng-Chang",
""
],
[
"Huang",
"Fei",
""
]
] |
In our previous work [Phys. Rev. D $\bf{101}$, 074025 (2020)], the photoproduction $\gamma p \to K^+ \Sigma^0(1385)$ has been investigated within an effective Lagrangian approach. There, the reaction amplitudes were constructed by considering the $t$-channel $K$ and $K^\ast(892)$ exchanges, $s$-channel $N$ contribution, $u$-channel $\Lambda$ exchange, generalized contact term, and a minimum number of $s$-channel $N$ and $\Delta$ resonance diagrams. It was found that the inclusion of one of the $N(1895){1/2}^-$, $\Delta(1900){1/2}^-$, and $\Delta(1930){5/2}^-$ resonances is essential to reproduce the available differential and total cross-section data for $\gamma p \to K^+ \Sigma^0(1385)$. In the present work, we employ the same model to study the photoproduction $\gamma n \to K^+ \Sigma^-(1385)$, with the purpose being to understand the reaction mechanism and, in particular, to figure out which one of the $N(1895){1/2}^-$, $\Delta(1900){1/2}^-$, and $\Delta(1930){5/2}^-$ resonances is really capable for a simultaneous description of the data for both $K^+ \Sigma^0(1385)$ and $K^+ \Sigma^-(1385)$ photoproduction reactions. The results show that the available data on differential and total cross sections and photo-beam asymmetries for $\gamma n \to K^+ \Sigma^-(1385)$ can be reproduced only with the inclusion of the $\Delta(1930){5/2}^-$ resonance rather than the other two. The generalized contact term and the $t$-channel $K$ exchange are found to dominate the background contributions. The resonance $\Delta(1930){5/2}^-$ provides the most important contributions in the whole energy region considered, and it is responsible for the bump structure exhibited in the total cross sections.
|
hep-ph/0607182
|
Abdesslam Arhrib
|
Abdesslam Arhrib, Rachid Benbrik and Mohamed Chabab
|
Charged Higgs Bosons decays H^\pm \to W^\pm (\gamma, Z) revisited
|
18 pages, 9 figures
|
J.Phys.G34:907-928,2007
|
10.1088/0954-3899/34/5/011
|
LPHEA-06-03
|
hep-ph
| null |
We study the complete one loop contribution to H^\pm\to W^\pm V, V= Z,
\gamma, both in the Minimal Supersymmetric Standard Model (MSSM) and in the Two
Higgs Doublet Model (2HDM). We evaluate the MSSM contributions and compare them
with the 2HDM ones taking into account b\to s\gamma constraint, vacuum
stability and unitarity constraints in the case of 2HDM, as well as
experimental constraints on the MSSM and 2HDM parameters. In the MSSM, we found
that in the intermediate range of \tan\beta \la 10 and for large A_t, the
branching ratio of H^\pm \to W^{\pm} Z can be of the order 10^{-3} while the
branching ratio of H^\pm \to W^{\pm} \gamma is of the order 10^{-5}. We also
study the effects of the CP violating phases of Soft SUSY parameters and found
that they can modify the branching ratio by about one order of magnitude.
However, in the 2HDM where the Higgs sector is less constrained as compared to
the MSSM higgs sector, one can reach branching ratio of the order 10^{-2} for
both modes.
|
[
{
"created": "Mon, 17 Jul 2006 09:09:58 GMT",
"version": "v1"
}
] |
2008-11-26
|
[
[
"Arhrib",
"Abdesslam",
""
],
[
"Benbrik",
"Rachid",
""
],
[
"Chabab",
"Mohamed",
""
]
] |
We study the complete one loop contribution to H^\pm\to W^\pm V, V= Z, \gamma, both in the Minimal Supersymmetric Standard Model (MSSM) and in the Two Higgs Doublet Model (2HDM). We evaluate the MSSM contributions and compare them with the 2HDM ones taking into account b\to s\gamma constraint, vacuum stability and unitarity constraints in the case of 2HDM, as well as experimental constraints on the MSSM and 2HDM parameters. In the MSSM, we found that in the intermediate range of \tan\beta \la 10 and for large A_t, the branching ratio of H^\pm \to W^{\pm} Z can be of the order 10^{-3} while the branching ratio of H^\pm \to W^{\pm} \gamma is of the order 10^{-5}. We also study the effects of the CP violating phases of Soft SUSY parameters and found that they can modify the branching ratio by about one order of magnitude. However, in the 2HDM where the Higgs sector is less constrained as compared to the MSSM higgs sector, one can reach branching ratio of the order 10^{-2} for both modes.
|
1906.02147
|
P. S. Bhupal Dev
|
P. S. Bhupal Dev
|
Signatures of Supersymmetry in Neutrino Telescopes
|
35 pages, 5 figures; Prepared for the forthcoming book "Particle
Physics with Neutrino Telescopes", C. Perez de los Heros, editor (World
Scientific)
|
Probing Particle Physics with Neutrino Telescopes, C. P. de los
Heros (ed.), World Scientific, Singapore (2020), pp. 317-352
|
10.1142/9789813275027_0010
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We review the prospects of probing $R$-parity violating Supersymmetry (RPV
SUSY) at neutrino telescopes using some of the highest energy particles given
to us by Nature. The presence of RPV interactions involving ultra-high energy
neutrinos with Earth-matter can lead to resonant production of TeV-scale SUSY
partners of the SM quarks and leptons (squarks and sleptons), thereby giving
rise to potentially anomalous behavior in the event spectrum observed by
large-volume neutrino detectors, such as IceCube, as well as balloon-borne
cosmic ray experiments, such as ANITA. Using the ultra-high energy neutrino
events observed recently at IceCube, with the fact that for a given power-law
flux of astrophysical neutrinos, there is no statistically significant
deviation in the current data from the Standard Model expectations, we derive
robust upper limits on the RPV couplings as a function of the
resonantly-produced squark mass, independent of the other unknown model
parameters, as long as the squarks decay dominantly to two-body final states
involving leptons and quarks through the RPV couplings. Also, we discuss RPV
SUSY interpretations of the recent anomalous, upward-going EeV air showers
observed at ANITA, in terms of long-lived charged or neutral next-to-lightest
SUSY particles.
|
[
{
"created": "Wed, 5 Jun 2019 17:11:31 GMT",
"version": "v1"
}
] |
2020-01-14
|
[
[
"Dev",
"P. S. Bhupal",
""
]
] |
We review the prospects of probing $R$-parity violating Supersymmetry (RPV SUSY) at neutrino telescopes using some of the highest energy particles given to us by Nature. The presence of RPV interactions involving ultra-high energy neutrinos with Earth-matter can lead to resonant production of TeV-scale SUSY partners of the SM quarks and leptons (squarks and sleptons), thereby giving rise to potentially anomalous behavior in the event spectrum observed by large-volume neutrino detectors, such as IceCube, as well as balloon-borne cosmic ray experiments, such as ANITA. Using the ultra-high energy neutrino events observed recently at IceCube, with the fact that for a given power-law flux of astrophysical neutrinos, there is no statistically significant deviation in the current data from the Standard Model expectations, we derive robust upper limits on the RPV couplings as a function of the resonantly-produced squark mass, independent of the other unknown model parameters, as long as the squarks decay dominantly to two-body final states involving leptons and quarks through the RPV couplings. Also, we discuss RPV SUSY interpretations of the recent anomalous, upward-going EeV air showers observed at ANITA, in terms of long-lived charged or neutral next-to-lightest SUSY particles.
|
0710.3403
|
Francesco Giacosa
|
Francesco Giacosa, Thomas Gutsche, Valery E. Lyubovitskij
|
On the two-photon decay width of the sigma meson
|
6 pages, 4 figures
|
Phys.Rev.D77:034007,2008
|
10.1103/PhysRevD.77.034007
| null |
hep-ph
| null |
We shortly report on the two-photon decay width of the light $\sigma$-meson
interpreted as a quarkonium state. Results are given in dependence on the
$\sigma$-mass and the constituent mass of the light quark. The triangle
quark-loop diagram, responsible for the two-photon transition, is carefully
evaluated: a term in the transition amplitude, often omitted in literature,
results in destructive interference with the leading term. As a result we show
that the two-photon decay width of the $\sigma $ in the quarkonium picture is
less than 1 keV for the physical range of parameters.
|
[
{
"created": "Wed, 17 Oct 2007 22:11:04 GMT",
"version": "v1"
},
{
"created": "Wed, 12 Mar 2008 09:52:25 GMT",
"version": "v2"
}
] |
2008-11-26
|
[
[
"Giacosa",
"Francesco",
""
],
[
"Gutsche",
"Thomas",
""
],
[
"Lyubovitskij",
"Valery E.",
""
]
] |
We shortly report on the two-photon decay width of the light $\sigma$-meson interpreted as a quarkonium state. Results are given in dependence on the $\sigma$-mass and the constituent mass of the light quark. The triangle quark-loop diagram, responsible for the two-photon transition, is carefully evaluated: a term in the transition amplitude, often omitted in literature, results in destructive interference with the leading term. As a result we show that the two-photon decay width of the $\sigma $ in the quarkonium picture is less than 1 keV for the physical range of parameters.
|
2204.09961
|
Matteo Rinaldi
|
Rinaldi Matteo
|
Double parton scattering via photon-proton interactions: a new light on
the transverse proton structure
|
Contribution to the proceedings of the 19th International Conference
on Hadron Spectroscopy and Structure (HADRON 2021). Accepted for publication
in Suplemento de la Revista Mexicana de Fisica
| null | null | null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
In this contribution we present the main results of the investigation about
double parton scattering (DPS) in quasi-real photon-proton interactions. We
show the first evaluation of the DPS cross-section at leading-order for the
four-jet photo-production observed at HERA. To this aim the $\gamma-p$
effective cross section has been computed for the first time. One of the main
outcomes of this analysis is that the DPS contribution is not negligible and
potentially measurable. Furthermore, possible future data could be used to get
new information on the transverse proton structure not accessible in other
processes.
|
[
{
"created": "Thu, 21 Apr 2022 08:37:03 GMT",
"version": "v1"
}
] |
2022-04-22
|
[
[
"Matteo",
"Rinaldi",
""
]
] |
In this contribution we present the main results of the investigation about double parton scattering (DPS) in quasi-real photon-proton interactions. We show the first evaluation of the DPS cross-section at leading-order for the four-jet photo-production observed at HERA. To this aim the $\gamma-p$ effective cross section has been computed for the first time. One of the main outcomes of this analysis is that the DPS contribution is not negligible and potentially measurable. Furthermore, possible future data could be used to get new information on the transverse proton structure not accessible in other processes.
|
hep-ph/0501164
|
Michael Spira
|
Petra H\"afliger, Michael Spira
|
Associated Higgs Boson Production with heavy Quarks in e+e- Collisions:
SUSY--QCD Corrections
|
18 pages, 14 figures, latex
|
Nucl.Phys. B719 (2005) 35-52
|
10.1016/j.nuclphysb.2005.04.017
|
PSI-PR-05-01
|
hep-ph
| null |
The processes e+e- -> t tbar/b bbar + Higgs allow to measure the Yukawa
couplings between Higgs bosons and heavy quarks in supersymmetric theories. The
complete set of next-to-leading order SUSY-QCD corrections to the cross
sections of these processes have been determined in the minimal supersymmetric
extension of the Standard Model. They turn out to be O(10-20%) and thus
important for future linear e+e- colliders.
|
[
{
"created": "Tue, 18 Jan 2005 10:28:08 GMT",
"version": "v1"
}
] |
2010-04-05
|
[
[
"Häfliger",
"Petra",
""
],
[
"Spira",
"Michael",
""
]
] |
The processes e+e- -> t tbar/b bbar + Higgs allow to measure the Yukawa couplings between Higgs bosons and heavy quarks in supersymmetric theories. The complete set of next-to-leading order SUSY-QCD corrections to the cross sections of these processes have been determined in the minimal supersymmetric extension of the Standard Model. They turn out to be O(10-20%) and thus important for future linear e+e- colliders.
|
hep-ph/0303243
|
Gilad Perez
|
Yuval Grossman and Gilad Perez
|
Realistic split fermion models
|
4 pages 1 figure. Talk presented by Gilad Perez at PASCOS '03, 9th
International Symposium on Particles, Strings and Cosmology, January 2003,
Mumbai, India
|
Pramana 62:733-736,2004
|
10.1007/BF02705358
| null |
hep-ph
| null |
The standard model flavor structure can be explained in theories where the
fermions are localized on different points in a compact extra dimension. We
explain how models with two bulk scalars compactified on an orbifold can
produce such separations in a natural way. We show that, generically, models of
Gaussian overlaps are unnatural since they require very large Yukawa couplings
between the fermions and the bulk scalars. We present a two scalar model that
accounts naturally for the quark flavor parameters and in particular yields
order one CP violating phase.
|
[
{
"created": "Fri, 28 Mar 2003 12:45:15 GMT",
"version": "v1"
}
] |
2010-11-19
|
[
[
"Grossman",
"Yuval",
""
],
[
"Perez",
"Gilad",
""
]
] |
The standard model flavor structure can be explained in theories where the fermions are localized on different points in a compact extra dimension. We explain how models with two bulk scalars compactified on an orbifold can produce such separations in a natural way. We show that, generically, models of Gaussian overlaps are unnatural since they require very large Yukawa couplings between the fermions and the bulk scalars. We present a two scalar model that accounts naturally for the quark flavor parameters and in particular yields order one CP violating phase.
|
hep-ph/9606343
|
Zhang Da-Xin
|
Paul Singer and Da-Xin Zhang
|
Weak Radiative Decays of Beauty Baryons
|
10 pages, latex, no figures
|
Phys.Lett. B383 (1996) 351-354
|
10.1016/0370-2693(96)00747-2
|
TECHNION-PH-96-8
|
hep-ph
| null |
Weak radiative decays of beauty baryons into strange baryons, induced by the
electroweak penguin, are estimated by using a quark model approach. Relations
between formfactors in the semileptonic and in the weak radiative decays are
derived within the heavy quark effective theory. The partial decay widths are
found to be of the order of $10^{-15}{\rm MeV}$ for
$\Lambda_b\rightarrow\Lambda\gamma$ and $\Xi_b\rightarrow\Xi\gamma$ and of the
oder of $10^{-13}{\rm MeV}$ for $\Omega_b\rightarrow\Omega\gamma$. The
$\Omega_b$ radiative decay is thus expected at the sizable branching ratio of
approximately $10^{-4}$.
|
[
{
"created": "Sun, 16 Jun 1996 13:16:18 GMT",
"version": "v1"
}
] |
2009-10-28
|
[
[
"Singer",
"Paul",
""
],
[
"Zhang",
"Da-Xin",
""
]
] |
Weak radiative decays of beauty baryons into strange baryons, induced by the electroweak penguin, are estimated by using a quark model approach. Relations between formfactors in the semileptonic and in the weak radiative decays are derived within the heavy quark effective theory. The partial decay widths are found to be of the order of $10^{-15}{\rm MeV}$ for $\Lambda_b\rightarrow\Lambda\gamma$ and $\Xi_b\rightarrow\Xi\gamma$ and of the oder of $10^{-13}{\rm MeV}$ for $\Omega_b\rightarrow\Omega\gamma$. The $\Omega_b$ radiative decay is thus expected at the sizable branching ratio of approximately $10^{-4}$.
|
1105.3847
|
Alexander Titov
|
A.I. Titov and B. Kampfer
|
Exclusive $\bar\Xi\Xi$ and $\bar\Xi_c\Xi_c$ production in $\bar pp$
collisions at $\sqrt{s}\leq 15$ GeV
|
4 pages, 7 figures
| null | null | null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Estimates of differential cross sections and longitudinal asymmetries are
presented for the reactions $\bar pp\to \bar \Xi\Xi$ and $\bar pp\to \bar
\Xi_c\Xi_c$ at energies $\sqrt{s}\lesssim 15$ GeV. The $\Xi$ and $\Xi_c$
hyperons are assumed to be produced in two-step processes: first, intermediate
$\bar\Lambda\Lambda$ and/or $\bar\Lambda_c\Lambda_c$ states are created which
are converted afterwards into final states $\bar \Xi\Xi$, $\bar \Xi_c\Xi_c$ and
$\bar \Xi_c\Xi_c$. The full amplitudes are described by loop diagrams within a
modified Regge model, based on the topological decomposition of planar quark
diagrams. A strong sensitivity of the ratio of yields of $\bar \Xi_c\Xi_c$ to
$\bar \Xi\Xi$ and of $\bar \Lambda_c\Lambda_c$ to $\bar \Lambda\Lambda$ to the
degree of SU(4) symmetry violation is found.
|
[
{
"created": "Thu, 19 May 2011 12:04:40 GMT",
"version": "v1"
}
] |
2011-05-20
|
[
[
"Titov",
"A. I.",
""
],
[
"Kampfer",
"B.",
""
]
] |
Estimates of differential cross sections and longitudinal asymmetries are presented for the reactions $\bar pp\to \bar \Xi\Xi$ and $\bar pp\to \bar \Xi_c\Xi_c$ at energies $\sqrt{s}\lesssim 15$ GeV. The $\Xi$ and $\Xi_c$ hyperons are assumed to be produced in two-step processes: first, intermediate $\bar\Lambda\Lambda$ and/or $\bar\Lambda_c\Lambda_c$ states are created which are converted afterwards into final states $\bar \Xi\Xi$, $\bar \Xi_c\Xi_c$ and $\bar \Xi_c\Xi_c$. The full amplitudes are described by loop diagrams within a modified Regge model, based on the topological decomposition of planar quark diagrams. A strong sensitivity of the ratio of yields of $\bar \Xi_c\Xi_c$ to $\bar \Xi\Xi$ and of $\bar \Lambda_c\Lambda_c$ to $\bar \Lambda\Lambda$ to the degree of SU(4) symmetry violation is found.
|
2207.08621
|
Amin Aboubrahim
|
Amin Aboubrahim, Lutz Althueser, Michael Klasen, Pran Nath and
Christian Weinheimer
|
Annual modulation of event rate and electron recoil energy in inelastic
scattering direct detection experiments
|
23 pages, 10 figures, 1 table
| null | null | null |
hep-ph
|
http://creativecommons.org/licenses/by/4.0/
|
In 2020 the XENON1T experiment observed an excess of events with an electron
recoil energy $E_R$ in the range of $2\,$--$\,3\,$keV. Such an excess can arise
from a variety of sources such as solar axions or a neutrino magnetic moment,
but also from inelastic scattering of dark matter off the xenon atoms. The
recoil energy of the electron then depends on the mass difference of the dark
particles. In this paper we show that the annual modulation of both the event
rate and the electron recoil energy provide important additional information
that allows to distinguish among different theoretical explanations of the
signal. To this end, we first extend the formalism of annual modulation to
electronic recoils, inelastic dark matter scattering and the electron recoil
energy. We then study a concrete theoretical model with two Dirac fermions and
a dark photon. We take into account all relevant cosmological and experimental
constraints on this model and apply it to the XENON1T and and XENONnT
experiments with realistic detection thresholds, efficiencies and energy
resolutions, fitting the main physical parameters of the model, i.e. the mass
splitting and the electron scattering cross section. The discriminatory power
of the additional information from the annual modulation of both the signal
rate and the electron recoil energy is then demonstrated for XENONnT with a
simplified model based on these main physical parameters. This more sensitive
procedure compared to time-only modulation analyses can also serve as a
template for other theoretical models with different dark matter candidates,
mediators and cosmology. For the $U(1)$ model with two Dirac fermions fitting
the XENON1T excess and the experimental conditions of XENONnT, taking into
account the annual variation of the signal rate and recoil energy allows for a
faster and more precise determination of the free model parameters.
|
[
{
"created": "Mon, 18 Jul 2022 14:12:07 GMT",
"version": "v1"
}
] |
2022-07-19
|
[
[
"Aboubrahim",
"Amin",
""
],
[
"Althueser",
"Lutz",
""
],
[
"Klasen",
"Michael",
""
],
[
"Nath",
"Pran",
""
],
[
"Weinheimer",
"Christian",
""
]
] |
In 2020 the XENON1T experiment observed an excess of events with an electron recoil energy $E_R$ in the range of $2\,$--$\,3\,$keV. Such an excess can arise from a variety of sources such as solar axions or a neutrino magnetic moment, but also from inelastic scattering of dark matter off the xenon atoms. The recoil energy of the electron then depends on the mass difference of the dark particles. In this paper we show that the annual modulation of both the event rate and the electron recoil energy provide important additional information that allows to distinguish among different theoretical explanations of the signal. To this end, we first extend the formalism of annual modulation to electronic recoils, inelastic dark matter scattering and the electron recoil energy. We then study a concrete theoretical model with two Dirac fermions and a dark photon. We take into account all relevant cosmological and experimental constraints on this model and apply it to the XENON1T and and XENONnT experiments with realistic detection thresholds, efficiencies and energy resolutions, fitting the main physical parameters of the model, i.e. the mass splitting and the electron scattering cross section. The discriminatory power of the additional information from the annual modulation of both the signal rate and the electron recoil energy is then demonstrated for XENONnT with a simplified model based on these main physical parameters. This more sensitive procedure compared to time-only modulation analyses can also serve as a template for other theoretical models with different dark matter candidates, mediators and cosmology. For the $U(1)$ model with two Dirac fermions fitting the XENON1T excess and the experimental conditions of XENONnT, taking into account the annual variation of the signal rate and recoil energy allows for a faster and more precise determination of the free model parameters.
|
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