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|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
2303.01897
|
Minghua Wei
|
Minghua Wei and Mei Huang
|
Spin alignment of vector mesons from quark dynamics in a rotating medium
|
12 pages, 8 figures
| null |
10.1088/1674-1137/acf036
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Vorticities in heavy-ion collisions (HICs) are supposed to induce spin
alignment and polarization phenomena of quarks and mesons. In this work, we
analyze the spin alignment of vector mesons $\phi$ and $\rho$ induced by
rotation from quark dynamics in the framework of the Nambu-Jona-Lasinio (NJL)
model. The rotating angular velocity induces mass splitting of spin components
for vector $\phi,\rho$ mesons $M_{\phi,\rho}(\Omega)\simeq
M_{\phi,\rho}(\Omega=0)-s_{z}\Omega$. This behavior contributes to the spin
alignment of vector mesons $\phi,\rho$ in an equilibrium medium and naturally
explains the negative deviation of $\rho_{00}-1/3$ for vector mesons.
Incidentally, the positive deviation of $\rho_{00}-1/3$ under the magnetic
field can also be easily understood from quark dynamics.
|
[
{
"created": "Fri, 3 Mar 2023 12:47:55 GMT",
"version": "v1"
}
] |
2023-09-11
|
[
[
"Wei",
"Minghua",
""
],
[
"Huang",
"Mei",
""
]
] |
Vorticities in heavy-ion collisions (HICs) are supposed to induce spin alignment and polarization phenomena of quarks and mesons. In this work, we analyze the spin alignment of vector mesons $\phi$ and $\rho$ induced by rotation from quark dynamics in the framework of the Nambu-Jona-Lasinio (NJL) model. The rotating angular velocity induces mass splitting of spin components for vector $\phi,\rho$ mesons $M_{\phi,\rho}(\Omega)\simeq M_{\phi,\rho}(\Omega=0)-s_{z}\Omega$. This behavior contributes to the spin alignment of vector mesons $\phi,\rho$ in an equilibrium medium and naturally explains the negative deviation of $\rho_{00}-1/3$ for vector mesons. Incidentally, the positive deviation of $\rho_{00}-1/3$ under the magnetic field can also be easily understood from quark dynamics.
|
2106.16029
|
Majid Hashemi
|
Majid Hashemi and Neda Nowbakht Ghalati
|
Parameter dependence and analysis of the 2HDM neutral Higgs boson pair
production and decay at future lepton colliders
|
12 pages, 20 figures, added event analysis and LHC SM Higgs
measurement constraints
|
Physics Letters B 830 (2022) 137153
|
10.1016/j.physletb.2022.137153
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
In this work, we present a study of the neutral Higgs bosons in the two Higgs
doublet model (2HDM) in terms of their production processes and decay channels
as a function of the model parameters. The analysis is performed for all four
types of the 2HDM and the most promising processes and decay channels are
identified for each type of the model. Several Higgs boson mass scenarios below
and above the threshold of decay to gauge boson pair are introduced and the
corresponding categories of final states are analyzed. The event analysis
including collider beam spectrum and detector simulation shows that future
lepton colliders have the potential to explore regions in the 2HDM parameter
space, which have not yet been excluded by LHC, in a few weeks of operation.
Final results are presented in terms of the signal distributions on top of the
background and 95% CL exclusion and 5$\sigma$ contours based on center of mass
energy of $\sqrt{s}$ = 500 GeV at the Compact Linear Collider (CLIC) or
International Linear Collider (ILC).
|
[
{
"created": "Wed, 30 Jun 2021 12:54:55 GMT",
"version": "v1"
},
{
"created": "Sat, 28 Aug 2021 08:36:40 GMT",
"version": "v2"
},
{
"created": "Sat, 7 May 2022 09:59:14 GMT",
"version": "v3"
}
] |
2022-06-01
|
[
[
"Hashemi",
"Majid",
""
],
[
"Ghalati",
"Neda Nowbakht",
""
]
] |
In this work, we present a study of the neutral Higgs bosons in the two Higgs doublet model (2HDM) in terms of their production processes and decay channels as a function of the model parameters. The analysis is performed for all four types of the 2HDM and the most promising processes and decay channels are identified for each type of the model. Several Higgs boson mass scenarios below and above the threshold of decay to gauge boson pair are introduced and the corresponding categories of final states are analyzed. The event analysis including collider beam spectrum and detector simulation shows that future lepton colliders have the potential to explore regions in the 2HDM parameter space, which have not yet been excluded by LHC, in a few weeks of operation. Final results are presented in terms of the signal distributions on top of the background and 95% CL exclusion and 5$\sigma$ contours based on center of mass energy of $\sqrt{s}$ = 500 GeV at the Compact Linear Collider (CLIC) or International Linear Collider (ILC).
|
hep-ph/0602038
|
Wang Qing
|
Xiang Chen, Ying Zhang, Fa-Min Chen, Qing Wang
|
Gauge and Lorentz Covariant Schwinger-Dyson Equation for Fermion
Propagator in Arbitrary External Gauge Field
|
10 pages
|
Chin.Phys.Lett. 25:1227,2008
|
10.1088/0256-307X/25/4/018
| null |
hep-ph
| null |
A formalism of gauge and Lorentz covariant Schwinger-Dyson equation is built
up for fermion propagator in presence of arbitrary external gauge field within
ladder approximation. Different type external electromagnetic field dependent
trial solutions are investigated which spontaneously breaking chiral symmetry.
|
[
{
"created": "Fri, 3 Feb 2006 16:15:48 GMT",
"version": "v1"
},
{
"created": "Sun, 19 Feb 2006 05:50:04 GMT",
"version": "v2"
},
{
"created": "Mon, 27 Feb 2006 03:55:13 GMT",
"version": "v3"
},
{
"created": "Sat, 6 May 2006 03:27:59 GMT",
"version": "v4"
},
{
"created": "Thu, 11 May 2006 00:51:17 GMT",
"version": "v5"
},
{
"created": "Thu, 26 Apr 2007 18:22:46 GMT",
"version": "v6"
}
] |
2011-08-31
|
[
[
"Chen",
"Xiang",
""
],
[
"Zhang",
"Ying",
""
],
[
"Chen",
"Fa-Min",
""
],
[
"Wang",
"Qing",
""
]
] |
A formalism of gauge and Lorentz covariant Schwinger-Dyson equation is built up for fermion propagator in presence of arbitrary external gauge field within ladder approximation. Different type external electromagnetic field dependent trial solutions are investigated which spontaneously breaking chiral symmetry.
|
1211.1207
|
Victor Goncalves
|
V. P. Goncalves
|
Probing the Odderon in coherent hadron - hadron interactions at CERN LHC
|
5 pages, 1 figure, 2 tables. arXiv admin note: text overlap with
arXiv:hep-ph/0306137
| null |
10.1016/j.nuclphysa.2013.02.016
| null |
hep-ph hep-ex nucl-ex nucl-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
One of the open questions of the strong interaction theory is the existence
of the Odderon, which is an unambiguous prediction of Quantum Chromodynamics,
but still not confirmed in the experiment. In this paper we propose the study
of the diffractive $\eta_c$ photoproduction in coherent interactions as a new
alternative to probe the Odderon in $pp$ and $PbPb$ collisions at CERN - LHC.
As the Pomeron exchange cannot contribute to this process, its observation
would indicate the existence of the Odderon. We predict total cross sections of
order of $pb \, (\mu b)$ for $pp \, (PbPb)$ collisions and large values for the
event rates/year, which makes, in principle, the experimental analysis of this
process feasible at LHC.
|
[
{
"created": "Tue, 6 Nov 2012 12:58:33 GMT",
"version": "v1"
}
] |
2015-06-12
|
[
[
"Goncalves",
"V. P.",
""
]
] |
One of the open questions of the strong interaction theory is the existence of the Odderon, which is an unambiguous prediction of Quantum Chromodynamics, but still not confirmed in the experiment. In this paper we propose the study of the diffractive $\eta_c$ photoproduction in coherent interactions as a new alternative to probe the Odderon in $pp$ and $PbPb$ collisions at CERN - LHC. As the Pomeron exchange cannot contribute to this process, its observation would indicate the existence of the Odderon. We predict total cross sections of order of $pb \, (\mu b)$ for $pp \, (PbPb)$ collisions and large values for the event rates/year, which makes, in principle, the experimental analysis of this process feasible at LHC.
|
hep-ph/9704209
|
Han Meng
|
Han Liang, Ma Wen-Gan and Yu Zeng-hui (USTC. P.R.China)
|
Top quark pair production via polarized and unpolarized photons in
Supersymmetric QCD
|
26 pages, LaTex, including 12 figures in 12 eps files. submitted to
Phys. Rev. D
|
Phys.Rev. D56 (1997) 265-275
|
10.1103/PhysRevD.56.265
| null |
hep-ph
| null |
QCD corrections to top quark pair production via fusion of both polarized and
unpolarized photons are calculated in Supersymmetric Model. The corrections are
found to be sizable. The dependence of the corrections on the masses of the
supersymmetric particles is also investigated. Furthermore, we studied CP
asymmetry effects arising from the complex couplings in the MSSM. The CP
violating parameter can reach $10^{-2}$ for favorable parameter values.
|
[
{
"created": "Wed, 2 Apr 1997 03:42:50 GMT",
"version": "v1"
}
] |
2009-10-30
|
[
[
"Liang",
"Han",
"",
"USTC. P.R.China"
],
[
"Wen-Gan",
"Ma",
"",
"USTC. P.R.China"
],
[
"Zeng-hui",
"Yu",
"",
"USTC. P.R.China"
]
] |
QCD corrections to top quark pair production via fusion of both polarized and unpolarized photons are calculated in Supersymmetric Model. The corrections are found to be sizable. The dependence of the corrections on the masses of the supersymmetric particles is also investigated. Furthermore, we studied CP asymmetry effects arising from the complex couplings in the MSSM. The CP violating parameter can reach $10^{-2}$ for favorable parameter values.
|
1811.01003
|
Elmar Biernat P
|
Elmar P. Biernat, Franz Gross, M. T Pe\~na, Alfred Stadler, Sofia
Leit\~ao
|
Quark mass function from a one-gluon-exchange-type interaction in
Minkowski space
|
18 pages, 10 figures
|
Phys. Rev. D 98, 114033 (2018)
|
10.1103/PhysRevD.98.114033
|
CFTP/18-014, JLAB-THY-18-2838
|
hep-ph nucl-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We present first results for the quark mass function in Minkowski space in
both the spacelike and timelike regions calculated from the same
quark-antiquark interaction kernel used in the latest meson calculations using
the Gross equation. This kernel consists of a Lorentz vector effective
one-gluon-exchange-type interaction, a vector constant, and a mixed
scalar-pseudoscalar covariant linear confining interaction that does not
contribute to the mass function. We analyze the gauge dependence of our
results, prove the gauge independence of the constituent quark mass and mass
gap equation, and identify the Yennie gauge as the appropriate gauge to be used
in CST calculations. We compare our results in the spacelike region to lattice
QCD data and find good agreement.
|
[
{
"created": "Fri, 2 Nov 2018 17:40:02 GMT",
"version": "v1"
},
{
"created": "Fri, 28 Dec 2018 14:42:21 GMT",
"version": "v2"
}
] |
2018-12-31
|
[
[
"Biernat",
"Elmar P.",
""
],
[
"Gross",
"Franz",
""
],
[
"Peña",
"M. T",
""
],
[
"Stadler",
"Alfred",
""
],
[
"Leitão",
"Sofia",
""
]
] |
We present first results for the quark mass function in Minkowski space in both the spacelike and timelike regions calculated from the same quark-antiquark interaction kernel used in the latest meson calculations using the Gross equation. This kernel consists of a Lorentz vector effective one-gluon-exchange-type interaction, a vector constant, and a mixed scalar-pseudoscalar covariant linear confining interaction that does not contribute to the mass function. We analyze the gauge dependence of our results, prove the gauge independence of the constituent quark mass and mass gap equation, and identify the Yennie gauge as the appropriate gauge to be used in CST calculations. We compare our results in the spacelike region to lattice QCD data and find good agreement.
|
1905.12722
|
Keisuke Harigaya
|
Lawrence J. Hall, Keisuke Harigaya
|
Higgs Parity Grand Unification
|
39 pages, 9 figures
| null |
10.1007/JHEP11(2019)033
| null |
hep-ph hep-ex
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
The vanishing of the Higgs quartic coupling of the Standard Model at high
energies may be explained by spontaneous breaking of Higgs Parity. Taking Higgs
Parity to originate from the Left-Right symmetry of the $SO(10)$ gauge group,
leads to a new scheme for precision gauge coupling unification that is
consistent with proton decay. We compute the relevant running of couplings and
threshold corrections to allow a precise correlation among Standard Model
parameters. The scheme has a built-in solution for obtaining a realistic value
for $m_b/m_\tau$, which further improves the precision from gauge coupling
unification, allowing the QCD coupling constant to be predicted to the level of
1 % or, alternatively, the top quark mass to 0.2 %. Future measurements of
these parameters may significantly constrain the detailed structure of the
theory. We also study an $SO(10)$ embedding of quark and lepton masses, showing
how large neutrino mixing is compatible with small quark mixing, and predict a
normal neutrino mass hierarchy. The strong CP problem may be explained by
combining Higgs Parity with space-time parity.
|
[
{
"created": "Wed, 29 May 2019 21:05:45 GMT",
"version": "v1"
}
] |
2020-01-08
|
[
[
"Hall",
"Lawrence J.",
""
],
[
"Harigaya",
"Keisuke",
""
]
] |
The vanishing of the Higgs quartic coupling of the Standard Model at high energies may be explained by spontaneous breaking of Higgs Parity. Taking Higgs Parity to originate from the Left-Right symmetry of the $SO(10)$ gauge group, leads to a new scheme for precision gauge coupling unification that is consistent with proton decay. We compute the relevant running of couplings and threshold corrections to allow a precise correlation among Standard Model parameters. The scheme has a built-in solution for obtaining a realistic value for $m_b/m_\tau$, which further improves the precision from gauge coupling unification, allowing the QCD coupling constant to be predicted to the level of 1 % or, alternatively, the top quark mass to 0.2 %. Future measurements of these parameters may significantly constrain the detailed structure of the theory. We also study an $SO(10)$ embedding of quark and lepton masses, showing how large neutrino mixing is compatible with small quark mixing, and predict a normal neutrino mass hierarchy. The strong CP problem may be explained by combining Higgs Parity with space-time parity.
|
hep-ph/0008174
|
Edward Sarkisyan
|
Gideon Alexander and Edward Sarkisyan (Tel Aviv University)
|
The many sources effect on the genuine multihadron correlations
|
12 pages, 4 figs. Invited talk presented by G. Alexander at the 9th
International Workshop on Multiparticle Production: New Frontiers in Soft
Physics and Correlations on the Threshold of the Third Millenium, Turin,
Italy, June 12 - 17, 2000
|
Nucl.Phys.Proc.Suppl. 92 (2001) 211-222
|
10.1016/S0920-5632(00)01036-7
| null |
hep-ph
| null |
Here we report on a study aimed to explore the dependence of the genuine
multiparticle correlations on the number of sources while the influence of
other possible factors affecting the multihadron production is avoided. The
analysis utilised the normalised cumulants, calculated in three-dimensional
phase space, of the reaction e+e- -> Z -> hadrons using a large Monte Carlo
event sample. The multi-sources reactions were simulated by overlaying a few
independent single e+e- annihilation events. It was found that as the number of
sources S increases, the cumulants do not change significantly their structure,
but those of an order q>2 (i.e. more than 2 pions) decrease fast in their
magnitude. This reduction can be understood in termsof combinatorial
considerations of source mixing which dilutes the correlations by a factor of
about 1/S^{q-1} which can also serve as a method to estimated the number of
sources. This expected suppression is well reproduced by recent cumulant
measurements in hadron and nucleus induced reactions both in one (rapidity) and
two (rapidity vs. azimuthal angle) dimensions. The diminishing genuine
correlations effect should also appear in other dynamical correlations like the
Bose-Einstein in e+e- -> W+W- -> hadrons and in nucleus-nucleus reactions.
|
[
{
"created": "Wed, 16 Aug 2000 20:18:53 GMT",
"version": "v1"
},
{
"created": "Mon, 28 Aug 2000 21:04:09 GMT",
"version": "v2"
}
] |
2009-10-31
|
[
[
"Alexander",
"Gideon",
"",
"Tel Aviv University"
],
[
"Sarkisyan",
"Edward",
"",
"Tel Aviv University"
]
] |
Here we report on a study aimed to explore the dependence of the genuine multiparticle correlations on the number of sources while the influence of other possible factors affecting the multihadron production is avoided. The analysis utilised the normalised cumulants, calculated in three-dimensional phase space, of the reaction e+e- -> Z -> hadrons using a large Monte Carlo event sample. The multi-sources reactions were simulated by overlaying a few independent single e+e- annihilation events. It was found that as the number of sources S increases, the cumulants do not change significantly their structure, but those of an order q>2 (i.e. more than 2 pions) decrease fast in their magnitude. This reduction can be understood in termsof combinatorial considerations of source mixing which dilutes the correlations by a factor of about 1/S^{q-1} which can also serve as a method to estimated the number of sources. This expected suppression is well reproduced by recent cumulant measurements in hadron and nucleus induced reactions both in one (rapidity) and two (rapidity vs. azimuthal angle) dimensions. The diminishing genuine correlations effect should also appear in other dynamical correlations like the Bose-Einstein in e+e- -> W+W- -> hadrons and in nucleus-nucleus reactions.
|
hep-ph/0512092
|
Oleg Selyugin
|
O.V. Selyugin
|
Is there exist a hadron spin-flip contribution in the Coulomb-hadron
interference at small transfer momenta and high energies
|
18 pages, 8 figures, Table Essentially revision. Figures and Table
are added, fit with new final data are made. Conclusion is not change
|
Eur.Phys.J.A28:83-89,2006
|
10.1140/epja/i2005-10275-y
| null |
hep-ph
| null |
The analysing power $A_N$ is examined in the range of the Coulomb-hadron
interferenceon on the basis of the experimental data from p_L = 6 GeV/c up to
200 GeV/c taking account of a phenomenological analysis at p_L = 6 GeV/c and a
dynamic high-energy spin model. The results are compared with the new RHIC data
at p_L = 100 GeV/c. The new experimental data obtained at RHIC indicate the
small contributions of the hadrons spin-flip amplitude.
|
[
{
"created": "Thu, 8 Dec 2005 08:20:22 GMT",
"version": "v1"
},
{
"created": "Tue, 28 Feb 2006 18:32:58 GMT",
"version": "v2"
}
] |
2014-11-18
|
[
[
"Selyugin",
"O. V.",
""
]
] |
The analysing power $A_N$ is examined in the range of the Coulomb-hadron interferenceon on the basis of the experimental data from p_L = 6 GeV/c up to 200 GeV/c taking account of a phenomenological analysis at p_L = 6 GeV/c and a dynamic high-energy spin model. The results are compared with the new RHIC data at p_L = 100 GeV/c. The new experimental data obtained at RHIC indicate the small contributions of the hadrons spin-flip amplitude.
|
1701.02300
|
Ujjal Dey
|
Sampurn Anand, Ujjal Kumar Dey, Subhendra Mohanty
|
Effects of QCD Equation of State on the Stochastic Gravitational Wave
Background
|
10 pages, 2 figures; minor changes in the text, references added;
matches published version
|
JCAP 1703 (2017) 018
|
10.1088/1475-7516/2017/03/018
| null |
hep-ph astro-ph.CO gr-qc
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Cosmological phase transitions can be a source of Stochastic Gravitational
Wave (SGW) background. Apart from the dynamics of the phase transition, the
characteristic frequency and the fractional energy density $\Omega_{\rm gw}$ of
the SGW depends upon the temperature of the transition. In this article, we
compute the SGW spectrum in the light of QCD equation of state provided by the
lattice results. We find that the inclusion of trace anomaly from lattice QCD,
enhances the SGW signal generated during QCD phase transition by $\sim 50\%$
and the peak frequency of the QCD era SGW are shifted higher by $\sim 25\%$ as
compared to the earlier estimates without trace anomaly. This result is
extremely significant for testing the phase transition dynamics near QCD epoch.
|
[
{
"created": "Mon, 9 Jan 2017 18:56:30 GMT",
"version": "v1"
},
{
"created": "Tue, 14 Mar 2017 22:29:00 GMT",
"version": "v2"
}
] |
2017-03-16
|
[
[
"Anand",
"Sampurn",
""
],
[
"Dey",
"Ujjal Kumar",
""
],
[
"Mohanty",
"Subhendra",
""
]
] |
Cosmological phase transitions can be a source of Stochastic Gravitational Wave (SGW) background. Apart from the dynamics of the phase transition, the characteristic frequency and the fractional energy density $\Omega_{\rm gw}$ of the SGW depends upon the temperature of the transition. In this article, we compute the SGW spectrum in the light of QCD equation of state provided by the lattice results. We find that the inclusion of trace anomaly from lattice QCD, enhances the SGW signal generated during QCD phase transition by $\sim 50\%$ and the peak frequency of the QCD era SGW are shifted higher by $\sim 25\%$ as compared to the earlier estimates without trace anomaly. This result is extremely significant for testing the phase transition dynamics near QCD epoch.
|
hep-ph/9701237
|
Mariana Kirchbach
|
Mariana Kirchbach and Andreas Wirzba
|
In-Medium Chiral Perturbation Theory and Pion Weak Decay in the Presence
of Background Matter
|
14 pages, RevTex, no figures, to appear in Nucl.Phys. A
|
Nucl.Phys. A616 (1997) 648-658
|
10.1016/S0375-9474(97)81120-7
|
MKPH-T-96-23
|
hep-ph nucl-th
| null |
Two-point functions related to the pion weak decay constant f_\pi are
calculated from the generating functional of chiral perturbation theory in the
mean-field approximation and the heavy-baryon limit. The aim is to demonstrate
that Lorentz invariance is violated in the presence of background matter. This
fact manifests itself in the splitting of both f_\pi and the pion mass into
uncorrelated time- and spacelike parts. We emphasize the different in-medium
renormalizations of the correlation functions, show the inequivalence between
the in-medium values of f_\pi deduced from Walecka-type models, on the one
hand, and QCD sum rules, on the other hand, and elaborate on the importance for
some nuclear physics observables.
|
[
{
"created": "Tue, 7 Jan 1997 11:41:37 GMT",
"version": "v1"
}
] |
2007-05-23
|
[
[
"Kirchbach",
"Mariana",
""
],
[
"Wirzba",
"Andreas",
""
]
] |
Two-point functions related to the pion weak decay constant f_\pi are calculated from the generating functional of chiral perturbation theory in the mean-field approximation and the heavy-baryon limit. The aim is to demonstrate that Lorentz invariance is violated in the presence of background matter. This fact manifests itself in the splitting of both f_\pi and the pion mass into uncorrelated time- and spacelike parts. We emphasize the different in-medium renormalizations of the correlation functions, show the inequivalence between the in-medium values of f_\pi deduced from Walecka-type models, on the one hand, and QCD sum rules, on the other hand, and elaborate on the importance for some nuclear physics observables.
|
2112.11682
|
N Rajeev
|
N Rajeev and Rupak Dutta
|
Consequences of $b\, \to\, s\, \mu^+\, \mu^-$ anomalies on $B \, \to \,
K^{(*)} \,\nu \, \bar{\nu}$, $B_s \to\, (\eta,\eta') \, \nu\,\bar{\nu}$ and
$B_s \, \to \, \phi \, \nu \, \bar{\nu}$ decay observables
|
Matches with the published version
| null |
10.1103/PhysRevD.105.115028
| null |
hep-ph
|
http://creativecommons.org/licenses/by/4.0/
|
The long persistent discrepancies in $b\,\to\,s\, \ell\, \ell$ quark level
transitions continue to be the ideal platform for an indirect search of new
physics that lies beyond the SM. The measurements of $R_K$, $R_{K^*}$,
$P_5^{\prime}$, $\mathcal{B}(B_s\, \to\, \phi\, \mu^+\,\mu^-)$ and
$\mathcal{B}(B_s\, \to\, \mu^+\,\mu^-)$ persistently deviate from the standard
model expectations. Similarly, the new tests of lepton flavor universality
performed using the isospin partners such as $B^0 \, \to \, K_S^{0} \,
\ell\,\ell$ and $B^+ \, \to \, K^{+*} \, \ell\,\ell$ exhibit the same pattern
of deviation in $R_{K_S^0}$ and $R_{K^{*+}}$ with the existing results.
Motivated by these anomalies we search for the patterns of new physics in the
family of flavor changing neutral decays with neutral leptons in the final
state undergoing $b \, \to \,s\, \nu \, \bar{\nu}$ quark level transitions.
There are close relations between $b\,\to\,s\, \ell\, \ell$ and $b \, \to \,s\,
\nu \, \bar{\nu}$ transitions not only in standard model but also in various
beyond the standard model scenarios. For beyond the standard model physics
under the $\rm SU_L(2)$ gauge symmetry one can relate the left handed charged
leptons to the neutrinos. Moreover, there are several advantages of studying $b
\, \to \,s\, \nu \, \bar{\nu}$ transitions over $b\,\to\,s\, \ell\, \ell$ as
they are free from various hadronic uncertainties beyond the form factors such
as the non-factorizable corrections and photonic penguin contributions. Hence,
we explore the consequences of $b\, \to\, s\, \mu^+\, \mu^-$ anomalies on $B \,
\to \, K^{(*)} \,\nu \, \bar{\nu}$, $B_s \to\, (\eta,\eta') \, \nu\,\bar{\nu}$
and $B_s \, \to \, \phi \, \nu \, \bar{\nu}$ decay observables in SMEFT
platform within various 1D and 2D new physics scenarios.
|
[
{
"created": "Wed, 22 Dec 2021 06:15:07 GMT",
"version": "v1"
},
{
"created": "Sun, 9 Jan 2022 04:54:25 GMT",
"version": "v2"
},
{
"created": "Wed, 6 Sep 2023 05:27:44 GMT",
"version": "v3"
}
] |
2023-09-07
|
[
[
"Rajeev",
"N",
""
],
[
"Dutta",
"Rupak",
""
]
] |
The long persistent discrepancies in $b\,\to\,s\, \ell\, \ell$ quark level transitions continue to be the ideal platform for an indirect search of new physics that lies beyond the SM. The measurements of $R_K$, $R_{K^*}$, $P_5^{\prime}$, $\mathcal{B}(B_s\, \to\, \phi\, \mu^+\,\mu^-)$ and $\mathcal{B}(B_s\, \to\, \mu^+\,\mu^-)$ persistently deviate from the standard model expectations. Similarly, the new tests of lepton flavor universality performed using the isospin partners such as $B^0 \, \to \, K_S^{0} \, \ell\,\ell$ and $B^+ \, \to \, K^{+*} \, \ell\,\ell$ exhibit the same pattern of deviation in $R_{K_S^0}$ and $R_{K^{*+}}$ with the existing results. Motivated by these anomalies we search for the patterns of new physics in the family of flavor changing neutral decays with neutral leptons in the final state undergoing $b \, \to \,s\, \nu \, \bar{\nu}$ quark level transitions. There are close relations between $b\,\to\,s\, \ell\, \ell$ and $b \, \to \,s\, \nu \, \bar{\nu}$ transitions not only in standard model but also in various beyond the standard model scenarios. For beyond the standard model physics under the $\rm SU_L(2)$ gauge symmetry one can relate the left handed charged leptons to the neutrinos. Moreover, there are several advantages of studying $b \, \to \,s\, \nu \, \bar{\nu}$ transitions over $b\,\to\,s\, \ell\, \ell$ as they are free from various hadronic uncertainties beyond the form factors such as the non-factorizable corrections and photonic penguin contributions. Hence, we explore the consequences of $b\, \to\, s\, \mu^+\, \mu^-$ anomalies on $B \, \to \, K^{(*)} \,\nu \, \bar{\nu}$, $B_s \to\, (\eta,\eta') \, \nu\,\bar{\nu}$ and $B_s \, \to \, \phi \, \nu \, \bar{\nu}$ decay observables in SMEFT platform within various 1D and 2D new physics scenarios.
|
2301.01780
|
Ricardo Zambujal Ferreira
|
Nuno P. Branco, Ricardo Z. Ferreira and Jo\~ao G. Rosa
|
Superradiant axion clouds around asteroid-mass primordial black holes
|
21 pages, 5 figures
| null |
10.1088/1475-7516/2023/04/003
| null |
hep-ph astro-ph.CO gr-qc
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We analyze the dynamics and observational signatures of axion clouds formed
via the superradiant instability around primordial black holes, focusing on the
mass range $10^{14}-10^{18}$ kg where the latter may account for all the dark
matter. We take into account the leading effects of axion self-interactions,
showing that, even though these limit the number of axions produced within each
cloud, a large number of superradiant axions become free of the black hole's
gravitational potential and accumulate in the intergalactic medium or even in
the host galaxy, depending on their escape velocity. This means that primordial
black hole dark matter may lead to a sizeable astrophysical population of
non-relativistic axions, with masses ranging from 0.1 eV to 1 MeV, depending on
the primordial black hole mass and spin. We then show that if such axions
couple to photons their contribution to the galactic and extragalactic
background flux, mainly in the X-ray and gamma-ray band of the spectrum, is
already beyond current observational limits for a large range of parameters
that are, therefore, excluded. We finish by showing the prospects of the Athena
X-ray telescope to further probe this co-existence of primordial black holes
and axions.
|
[
{
"created": "Wed, 4 Jan 2023 19:00:02 GMT",
"version": "v1"
}
] |
2023-04-12
|
[
[
"Branco",
"Nuno P.",
""
],
[
"Ferreira",
"Ricardo Z.",
""
],
[
"Rosa",
"João G.",
""
]
] |
We analyze the dynamics and observational signatures of axion clouds formed via the superradiant instability around primordial black holes, focusing on the mass range $10^{14}-10^{18}$ kg where the latter may account for all the dark matter. We take into account the leading effects of axion self-interactions, showing that, even though these limit the number of axions produced within each cloud, a large number of superradiant axions become free of the black hole's gravitational potential and accumulate in the intergalactic medium or even in the host galaxy, depending on their escape velocity. This means that primordial black hole dark matter may lead to a sizeable astrophysical population of non-relativistic axions, with masses ranging from 0.1 eV to 1 MeV, depending on the primordial black hole mass and spin. We then show that if such axions couple to photons their contribution to the galactic and extragalactic background flux, mainly in the X-ray and gamma-ray band of the spectrum, is already beyond current observational limits for a large range of parameters that are, therefore, excluded. We finish by showing the prospects of the Athena X-ray telescope to further probe this co-existence of primordial black holes and axions.
|
1611.01983
|
Xianjun Huang
|
Xian-Jun Huang, Chun-Cheng Wei, Yue-Liang Wu, Wei-Hong Zhang and
Yu-Feng Zhou
|
Antiprotons from dark matter annihilation through light mediators and a
possible excess in AMS-02 $\bar{p}/p$ data
|
5 pages, 3 figures
|
Phys. Rev. D 95, 063021 (2017)
|
10.1103/PhysRevD.95.063021
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We show that in the scenario where dark matter (DM) particles annihilate
through light mediators, the energy spectra of the final state cosmic-ray
particles depend strongly on the mediator mass. For final state antiprotons, a
spectrum with relatively narrow peak occurs when the mediator mass is
comparable to the $\pbar p$ production threshold. Of interest, the latest
AMS-02 data on the $\pbar/p$ flux ratio hint at a bump-like excess over the
expected background in the energy range $\sim100-450$ GeV. We show that such a
light mediator scenario is favoured by the latest AMS-02 data over the
scenarios of DM direct annihilation into the standard model particles and that
of antiprotons produced from inside supernova remnants (SNRs), and is
consistent with the upper limits derived from the Fermi-LAT data on the gamma
rays towards the dwarf spheroidal galaxies. The $\pbar/p$ flux ratio with
energy above 450 GeV is predicted to fall with energy quickly, which can be
easily distinguished from the other two scenarios as they predict the ratio to
be flattening or rising up to multi-TeV region.
|
[
{
"created": "Mon, 7 Nov 2016 10:57:24 GMT",
"version": "v1"
},
{
"created": "Mon, 14 Nov 2016 07:49:48 GMT",
"version": "v2"
}
] |
2017-04-05
|
[
[
"Huang",
"Xian-Jun",
""
],
[
"Wei",
"Chun-Cheng",
""
],
[
"Wu",
"Yue-Liang",
""
],
[
"Zhang",
"Wei-Hong",
""
],
[
"Zhou",
"Yu-Feng",
""
]
] |
We show that in the scenario where dark matter (DM) particles annihilate through light mediators, the energy spectra of the final state cosmic-ray particles depend strongly on the mediator mass. For final state antiprotons, a spectrum with relatively narrow peak occurs when the mediator mass is comparable to the $\pbar p$ production threshold. Of interest, the latest AMS-02 data on the $\pbar/p$ flux ratio hint at a bump-like excess over the expected background in the energy range $\sim100-450$ GeV. We show that such a light mediator scenario is favoured by the latest AMS-02 data over the scenarios of DM direct annihilation into the standard model particles and that of antiprotons produced from inside supernova remnants (SNRs), and is consistent with the upper limits derived from the Fermi-LAT data on the gamma rays towards the dwarf spheroidal galaxies. The $\pbar/p$ flux ratio with energy above 450 GeV is predicted to fall with energy quickly, which can be easily distinguished from the other two scenarios as they predict the ratio to be flattening or rising up to multi-TeV region.
|
1904.10661
|
Zeren Simon Wang
|
Zeren Simon Wang, Kechen Wang
|
Long-lived light neutralinos at future $Z-$factories
|
7 pages, 2 figures, 2 tables; v2, 13 pages, 7 figures, 2 tables,
accepted for publication in Phys. Rev. D
|
Phys. Rev. D 101, 115018 (2020)
|
10.1103/PhysRevD.101.115018
|
BONN-TH-2019-01
|
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Future lepton colliders such as the CEPC and FCC-ee would run as
high-luminosity $Z-$boson factories, which offer a unique opportunity to study
long-lived particles which couple to Z-bosons. In order to exemplify this
particular advantage, in this work we consider one benchmark physics scenario
where the long-lived lightest neutralinos pair
$(\tilde{\chi}_1^0\tilde{\chi}_1^0)$ is produced from $Z-$decays in the context
of the R-parity violating supersymmetry. Our analysis indicates that when
assuming BR$(Z\rightarrow \tilde{\chi}_1^0\tilde{\chi}_1^0) = 10^{-3}$ and
$m_{\tilde{\chi}_1^0} \sim 40$ GeV, the model parameter $\lambda'_{112} /
m^2_{\tilde{f}}$ can be discovered down to as low as $\sim 1.5 \times 10^{-14}$
($3.9 \times 10^{-14}$) GeV$^{-2}$ at the FCC-ee (CEPC) with center-of-mass
energy $\sqrt{s} = 91.2$ GeV and 150 (16) ab$^{-1}$ integrated luminosity.
These limits exceed the projected sensitivity reaches of the ATLAS experiment
at the HL-LHC and the proposed LHC experiments with far detectors (AL3X,
CODEX-b, FASER, and MATHUSLA).
|
[
{
"created": "Wed, 24 Apr 2019 07:15:12 GMT",
"version": "v1"
},
{
"created": "Wed, 10 Jun 2020 05:47:47 GMT",
"version": "v2"
}
] |
2020-07-01
|
[
[
"Wang",
"Zeren Simon",
""
],
[
"Wang",
"Kechen",
""
]
] |
Future lepton colliders such as the CEPC and FCC-ee would run as high-luminosity $Z-$boson factories, which offer a unique opportunity to study long-lived particles which couple to Z-bosons. In order to exemplify this particular advantage, in this work we consider one benchmark physics scenario where the long-lived lightest neutralinos pair $(\tilde{\chi}_1^0\tilde{\chi}_1^0)$ is produced from $Z-$decays in the context of the R-parity violating supersymmetry. Our analysis indicates that when assuming BR$(Z\rightarrow \tilde{\chi}_1^0\tilde{\chi}_1^0) = 10^{-3}$ and $m_{\tilde{\chi}_1^0} \sim 40$ GeV, the model parameter $\lambda'_{112} / m^2_{\tilde{f}}$ can be discovered down to as low as $\sim 1.5 \times 10^{-14}$ ($3.9 \times 10^{-14}$) GeV$^{-2}$ at the FCC-ee (CEPC) with center-of-mass energy $\sqrt{s} = 91.2$ GeV and 150 (16) ab$^{-1}$ integrated luminosity. These limits exceed the projected sensitivity reaches of the ATLAS experiment at the HL-LHC and the proposed LHC experiments with far detectors (AL3X, CODEX-b, FASER, and MATHUSLA).
|
2402.15124
|
Keisuke Nagano
|
Naoyuki Haba, Keisuke Nagano, Yasuhiro Shimizu, and Toshifumi Yamada
|
Gauge coupling unification and proton decay via 45 Higgs boson in SU(5)
GUT
|
16 pages, 5 figures, 4 Tables Version accepted for publication in
PTEP
| null |
10.1093/ptep/ptae066
| null |
hep-ph
|
http://creativecommons.org/licenses/by-nc-nd/4.0/
|
We study the gauge coupling unification (GCU) and proton decay in a
non-supersymmetric SU(5) grand unified theory (GUT) incorporating a 45
representation Higgs field. Our analysis is based on the assumption that
Georgi-Jarlskog-type mass matrices for fermions are responsible for explaining
the mass ratio of the strange quark and the muon. We examine the conditions of
GCU, taking into account the possibility that certain components of the 45
Higgs field have masses much smaller than the GUT scale. We have found that to
satisfy the GCU conditions, at least two components of the 45 Higgs field
should have such small masses. We search the parameter space to identify
regions where the GCU conditions are satisfied, in the scenarios where two or
three components of the 45 Higgs boson are hierarchically light. If the colored
Higgs component of the 45 Higgs boson has a mass much smaller than the GUT
scale, proton decay via colored Higgs boson exchange can occur with an
observably large rate. We estimate the mass bounds for the colored Higgs
component from the proton decay search at Super- Kamiokande and thereby further
restrict the parameter space.
|
[
{
"created": "Fri, 23 Feb 2024 06:22:14 GMT",
"version": "v1"
},
{
"created": "Tue, 14 May 2024 03:38:52 GMT",
"version": "v2"
}
] |
2024-05-17
|
[
[
"Haba",
"Naoyuki",
""
],
[
"Nagano",
"Keisuke",
""
],
[
"Shimizu",
"Yasuhiro",
""
],
[
"Yamada",
"Toshifumi",
""
]
] |
We study the gauge coupling unification (GCU) and proton decay in a non-supersymmetric SU(5) grand unified theory (GUT) incorporating a 45 representation Higgs field. Our analysis is based on the assumption that Georgi-Jarlskog-type mass matrices for fermions are responsible for explaining the mass ratio of the strange quark and the muon. We examine the conditions of GCU, taking into account the possibility that certain components of the 45 Higgs field have masses much smaller than the GUT scale. We have found that to satisfy the GCU conditions, at least two components of the 45 Higgs field should have such small masses. We search the parameter space to identify regions where the GCU conditions are satisfied, in the scenarios where two or three components of the 45 Higgs boson are hierarchically light. If the colored Higgs component of the 45 Higgs boson has a mass much smaller than the GUT scale, proton decay via colored Higgs boson exchange can occur with an observably large rate. We estimate the mass bounds for the colored Higgs component from the proton decay search at Super- Kamiokande and thereby further restrict the parameter space.
|
2103.12074
|
V\'ictor Bres\'o Pla
|
V\'ictor Bres\'o-Pla, Adam Falkowski, Mart\'in Gonz\'alez-Alonso
|
$A_{FB}$ in the SMEFT: precision Z physics at the LHC
|
24 pages, 5 figures
| null |
10.1007/JHEP08(2021)021
|
IFIC/21-06, FTUV/21-0323
|
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We study the forward-backward asymmetry $A_{FB}$ in $pp \to \ell^+\ell^-$ at
the Z peak within the Standard Model Effective Field Theory (SMEFT). We find
that this observable provides per mille level constraints on the vertex
corrections of the Z boson to quarks,which close a flat direction in the
electroweak precision SMEFT fit. Moreover, we show that current $A_{FB}$ data
is precise enough so that its inclusion in the fit improves significantly LEP
bounds even in simple New Physics setups. This demonstrates that the LHC can
compete with and complement LEP when it comes to precision measurements of the
Z boson properties
|
[
{
"created": "Mon, 22 Mar 2021 18:00:02 GMT",
"version": "v1"
}
] |
2021-09-01
|
[
[
"Bresó-Pla",
"Víctor",
""
],
[
"Falkowski",
"Adam",
""
],
[
"González-Alonso",
"Martín",
""
]
] |
We study the forward-backward asymmetry $A_{FB}$ in $pp \to \ell^+\ell^-$ at the Z peak within the Standard Model Effective Field Theory (SMEFT). We find that this observable provides per mille level constraints on the vertex corrections of the Z boson to quarks,which close a flat direction in the electroweak precision SMEFT fit. Moreover, we show that current $A_{FB}$ data is precise enough so that its inclusion in the fit improves significantly LEP bounds even in simple New Physics setups. This demonstrates that the LHC can compete with and complement LEP when it comes to precision measurements of the Z boson properties
|
1612.06626
|
Jose Miguel No
|
Jose Miguel No, Michael Spannowsky
|
A Boost to $h \to Z \gamma$: from LHC to Future $e^+ e^-$ Colliders
|
Matches Published Version
|
Phys. Rev. D 95, 075027 (2017)
|
10.1103/PhysRevD.95.075027
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
A precise measurement of the Higgs $h \to Z \gamma$ decay is very challenging
at the LHC, due to the very low %SM $h \to Z \gamma\, (Z \to \ell \ell)$
branching fraction and the shortage of kinematic handles to suppress the large
SM $Z \gamma$ background. We show how such a measurement would be significantly
improved by considering Higgs production in association with a hard jet. We
compare the prospective HL-LHC sensitivity in this channel with other Higgs
production modes where $h$ is fairly boosted, e.g.~weak boson fusion, and also
to the potential $h \to Z \gamma$ measurement achievable with a future
$e^{+}e^{-}$ circular collider ({\sl fcc-ee}). Finally, we discuss new physics
implications of a precision measurement of $h \to Z \gamma$.
|
[
{
"created": "Tue, 20 Dec 2016 12:22:33 GMT",
"version": "v1"
},
{
"created": "Tue, 3 Oct 2017 18:39:24 GMT",
"version": "v2"
}
] |
2017-10-05
|
[
[
"No",
"Jose Miguel",
""
],
[
"Spannowsky",
"Michael",
""
]
] |
A precise measurement of the Higgs $h \to Z \gamma$ decay is very challenging at the LHC, due to the very low %SM $h \to Z \gamma\, (Z \to \ell \ell)$ branching fraction and the shortage of kinematic handles to suppress the large SM $Z \gamma$ background. We show how such a measurement would be significantly improved by considering Higgs production in association with a hard jet. We compare the prospective HL-LHC sensitivity in this channel with other Higgs production modes where $h$ is fairly boosted, e.g.~weak boson fusion, and also to the potential $h \to Z \gamma$ measurement achievable with a future $e^{+}e^{-}$ circular collider ({\sl fcc-ee}). Finally, we discuss new physics implications of a precision measurement of $h \to Z \gamma$.
|
2408.01197
|
PanPan Shi
|
Pan-Pan Shi, F. Gil-Dom\'inguez, R. Molina, Meng-Lin Du
|
Pole analysis for the $D^{*}\bar K$-$D\bar{K^*}$ coupled-channel system
|
23 pages, 4 figures
| null | null | null |
hep-ph hep-ex nucl-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
By solving the Lippmann-Schwinger equation, possible hadronic molecules in
the $D^*\bar K$-$D\bar K^*$ coupled-channel system are investigated with the
one-meson exchange potentials, where both vector and pseudoscalar mesons are
considered as exchange particles. We find an S-wave virtual state with mass
$2472(18)$ MeV, and a resonance with mass $M=2747(31)$ and width $\Gamma=7(3)$
MeV. In the $D^* \bar K$ invariant mass distribution, the virtual state appears
as a cusp at the $D^*\bar K$ threshold, while the resonance potentially
manifests as a dip. In particular, we take into account the $D\bar K \pi$
three-body dynamics due to the on-shell pion exchange and the finite decay
widths for $D^*$ and $\bar K^*$. Additionally, the cutoff dependence and the
SU(4) breaking effect are investigated in our work. Our results also indicate
that the accurate measurement for the decay width of the $D\bar K^*$ resonance
can help us to evaluate the SU(4) breaking effect in the future.
|
[
{
"created": "Fri, 2 Aug 2024 11:24:58 GMT",
"version": "v1"
}
] |
2024-08-05
|
[
[
"Shi",
"Pan-Pan",
""
],
[
"Gil-Domínguez",
"F.",
""
],
[
"Molina",
"R.",
""
],
[
"Du",
"Meng-Lin",
""
]
] |
By solving the Lippmann-Schwinger equation, possible hadronic molecules in the $D^*\bar K$-$D\bar K^*$ coupled-channel system are investigated with the one-meson exchange potentials, where both vector and pseudoscalar mesons are considered as exchange particles. We find an S-wave virtual state with mass $2472(18)$ MeV, and a resonance with mass $M=2747(31)$ and width $\Gamma=7(3)$ MeV. In the $D^* \bar K$ invariant mass distribution, the virtual state appears as a cusp at the $D^*\bar K$ threshold, while the resonance potentially manifests as a dip. In particular, we take into account the $D\bar K \pi$ three-body dynamics due to the on-shell pion exchange and the finite decay widths for $D^*$ and $\bar K^*$. Additionally, the cutoff dependence and the SU(4) breaking effect are investigated in our work. Our results also indicate that the accurate measurement for the decay width of the $D\bar K^*$ resonance can help us to evaluate the SU(4) breaking effect in the future.
|
hep-ph/9605284
|
Alejandra Melfo
|
Alejandra Melfo and Goran Senjanovic
|
Broken Symmetries in the Early Universe
|
Latex, 12 pages, based on talks by G.S. given at Future Perspectives
in Elementary Particle Physics (Valencia, June 1995), Four Seas Conference
(Trieste, July 1995) and 5th Hellenic School on Elementary Particle Physics
(Corfu, September 1995)
| null | null |
IC/96/76
|
hep-ph
| null |
We give a brief review of recent results on symmetry nonrestoration at high
temperature.
|
[
{
"created": "Sun, 12 May 1996 11:13:49 GMT",
"version": "v1"
}
] |
2007-05-23
|
[
[
"Melfo",
"Alejandra",
""
],
[
"Senjanovic",
"Goran",
""
]
] |
We give a brief review of recent results on symmetry nonrestoration at high temperature.
|
0712.0327
|
Thomas Gehrmann
|
G. Dissertori, A. Gehrmann-De Ridder, T. Gehrmann, E.W.N. Glover, G.
Heinrich, H. Stenzel
|
First determination of the strong coupling constant using NNLO
predictions for hadronic event shapes in e^+e^- annihilations
|
25 pages, LaTeX, extended discussion of hadronization corrections,
typos corrected
|
JHEP 0802:040,2008
|
10.1088/1126-6708/2008/02/040
|
ZU-TH 28/07, IPPP/07/91, Edinburgh 2007-48, ETHZ-IPP RP-2007-04
|
hep-ph hep-ex
| null |
We present the first determination of the strong coupling constant from a fit
of next-to-next-to-leading order QCD predictions to event-shape variables,
measured in $e^+e^-$ annihilations at LEP. The data have been collected by the
ALEPH detector at centre-of-mass energies between 91 and 206 GeV. Compared to
results of next-to-leading order fits we observe that the central fit values
are lower by about 10%, with considerably reduced scatter among the results
obtained with different event-shape variables. The dominant systematic
uncertainty from renormalization scale variations is reduced by a factor of
two. By combining the results for several event-shape variables and
centre-of-mass energies, we find \alpha_s(M_Z^2) =
0.1240+-0.0008(stat)+-0.0010(exp)+-0.0011(had)+-0.0029(theo).
|
[
{
"created": "Mon, 3 Dec 2007 15:51:12 GMT",
"version": "v1"
},
{
"created": "Mon, 11 Feb 2008 12:48:12 GMT",
"version": "v2"
}
] |
2008-12-30
|
[
[
"Dissertori",
"G.",
""
],
[
"Ridder",
"A. Gehrmann-De",
""
],
[
"Gehrmann",
"T.",
""
],
[
"Glover",
"E. W. N.",
""
],
[
"Heinrich",
"G.",
""
],
[
"Stenzel",
"H.",
""
]
] |
We present the first determination of the strong coupling constant from a fit of next-to-next-to-leading order QCD predictions to event-shape variables, measured in $e^+e^-$ annihilations at LEP. The data have been collected by the ALEPH detector at centre-of-mass energies between 91 and 206 GeV. Compared to results of next-to-leading order fits we observe that the central fit values are lower by about 10%, with considerably reduced scatter among the results obtained with different event-shape variables. The dominant systematic uncertainty from renormalization scale variations is reduced by a factor of two. By combining the results for several event-shape variables and centre-of-mass energies, we find \alpha_s(M_Z^2) = 0.1240+-0.0008(stat)+-0.0010(exp)+-0.0011(had)+-0.0029(theo).
|
2207.14340
|
Adrian Palcu
|
Adrian Palcu
|
Weak charges quantization in $SU(3)_{c} \otimes SU(n)_{L} \otimes
U(1)_{Y}$ gauge models
|
15 pages, 2 Tables, no figures. arXiv admin note: substantial text
overlap with arXiv:2201.00603
|
EPL 140 (2022) 64002
|
10.1209/0295-5075/aca55e
| null |
hep-ph
|
http://creativecommons.org/licenses/by/4.0/
|
After proving, in a previous paper, that the electric charge quantization
occurs as a natural consequence in renormalizable $SU(3)_c \otimes SU(n)_{L}
\otimes U(1)_{Y}$ gauge models, we take here a step further within the same
paradigm in order to obtain the precise weak charges quantization. To this end
a viable boson mass spectrum yields first, once a proper parametrization in the
Higgs sector is employed. Hence, by diagonalizing the neutral bosons mass
matrix, the quantized neutral weak charge operators are obtained. The Standard
Model phenomenology is entirely recovered, as its scale ($v_{SM}=246$ GeV) is
decoupled from the higher scale ($V\sim$ 10 TeV) specific to our generalized
electro-weak unification.
|
[
{
"created": "Wed, 27 Jul 2022 14:53:20 GMT",
"version": "v1"
}
] |
2023-01-03
|
[
[
"Palcu",
"Adrian",
""
]
] |
After proving, in a previous paper, that the electric charge quantization occurs as a natural consequence in renormalizable $SU(3)_c \otimes SU(n)_{L} \otimes U(1)_{Y}$ gauge models, we take here a step further within the same paradigm in order to obtain the precise weak charges quantization. To this end a viable boson mass spectrum yields first, once a proper parametrization in the Higgs sector is employed. Hence, by diagonalizing the neutral bosons mass matrix, the quantized neutral weak charge operators are obtained. The Standard Model phenomenology is entirely recovered, as its scale ($v_{SM}=246$ GeV) is decoupled from the higher scale ($V\sim$ 10 TeV) specific to our generalized electro-weak unification.
|
hep-ph/0102258
|
Muneyuki Ishida
|
Muneyuki Ishida (Tokyo Inst. of Tech.) and Shin Ishida (Nihon Univ.)
|
Property of Chiral Scalar and Axial-Vector Mesons in Heavy-Light Quark
System
|
12 pages, 1 eps figure, uses ptptex.sty
| null |
10.1143/PTP.106.373
| null |
hep-ph
| null |
We investigate the properties of new scalar X_B, X_D and axial-vector X_B*,
X_D* mesons, which are recently predicted, in the covariant
meson-classification scheme, to exist as the partners of ground-state
pseudoscalar B, D and vector B*, D* mesons, respectively, realizing a linear
representation of chiral symmetry for the light quark component in
heavy-light-quark meson system. The mass splittings between the respective
chiral partners are shown to be equal, and the decay widths of one pion
emission of X_B, X_D, X_B* and X_D* become to have a common value, due to
chiral and heavy quark symmetry.
|
[
{
"created": "Wed, 21 Feb 2001 01:12:58 GMT",
"version": "v1"
}
] |
2009-11-07
|
[
[
"Ishida",
"Muneyuki",
"",
"Tokyo Inst. of Tech."
],
[
"Ishida",
"Shin",
"",
"Nihon Univ."
]
] |
We investigate the properties of new scalar X_B, X_D and axial-vector X_B*, X_D* mesons, which are recently predicted, in the covariant meson-classification scheme, to exist as the partners of ground-state pseudoscalar B, D and vector B*, D* mesons, respectively, realizing a linear representation of chiral symmetry for the light quark component in heavy-light-quark meson system. The mass splittings between the respective chiral partners are shown to be equal, and the decay widths of one pion emission of X_B, X_D, X_B* and X_D* become to have a common value, due to chiral and heavy quark symmetry.
|
hep-ph/0210261
|
Michelangelo Mangano
|
M.L.Mangano, M.Moretti, F.Piccinini, R.Pittau and A.D.Polosa
|
b-bbar final states in Higgs production via weak boson fusion at the LHC
|
15 pages, 4 figures. Version to appear on Phys. Lett.B. Corrected
mistake in determination of Yukawa coupling sensitivity
|
Phys.Lett. B556 (2003) 50-60
|
10.1016/S0370-2693(03)00078-9
|
CERN-TH/2002-287, FNT/T-2002/16
|
hep-ph
| null |
We present a study of the Higgs production at the LHC via Weak Boson Fusion,
with the Higgs boson decaying into a b-quark pair. A detailed partonic LO
calculation of all the potential backgrounds is performed. We conclude that
this channel for Higgs production can be extracted from the backgrounds, and
present our estimates of the accuracy in the determination of the Hbb Yukawa
coupling.
|
[
{
"created": "Fri, 18 Oct 2002 10:19:40 GMT",
"version": "v1"
},
{
"created": "Thu, 9 Jan 2003 15:14:27 GMT",
"version": "v2"
}
] |
2010-04-05
|
[
[
"Mangano",
"M. L.",
""
],
[
"Moretti",
"M.",
""
],
[
"Piccinini",
"F.",
""
],
[
"Pittau",
"R.",
""
],
[
"Polosa",
"A. D.",
""
]
] |
We present a study of the Higgs production at the LHC via Weak Boson Fusion, with the Higgs boson decaying into a b-quark pair. A detailed partonic LO calculation of all the potential backgrounds is performed. We conclude that this channel for Higgs production can be extracted from the backgrounds, and present our estimates of the accuracy in the determination of the Hbb Yukawa coupling.
|
2205.03864
|
O\u{g}uzhan Uzun
|
C. Aydin, O. Uzun, and A. I. Ahmadov
|
Direct $\rho_L$ meson production in proton-proton and proton-antiproton
collisions
|
21 pages, 11 figures. arXiv admin note: text overlap with
arXiv:1903.00890
|
Int. J. Mod. Phys. A37, No.08, 2250042 (2022)
|
10.1142/S0217751X22500427
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We have investigated the contribution of the Higher Twist (HT) Feynman
diagrams to the large-$p_T$ inclusive $\rho_L$ meson production cross section
in proton-proton and proton-antiproton collisions and we discuss the
phenomenological consequences of possible HT contributions to cross sections.
To extract HT subprocesses from Leading Twist (LT) background, we use various
$\rho_L$ meson distribution amplitudes(DAs). In the numerical calculations, the
dependencies of the HT contribution on the transverse momentum and the rapidity
are discussed with special emphasis on DAs. Analysis of our results shows that
HT contributions decrease more rapidly than LT contributions with increasing
$p_T$. The preceding results demonstrate that HT contributions must be
considered especially in the region of low $p_T$ and the HT contribution to the
cross-section depends on the choice of the meson distribution amplitudes.
|
[
{
"created": "Sun, 8 May 2022 13:30:26 GMT",
"version": "v1"
},
{
"created": "Sat, 14 May 2022 14:40:34 GMT",
"version": "v2"
}
] |
2022-05-18
|
[
[
"Aydin",
"C.",
""
],
[
"Uzun",
"O.",
""
],
[
"Ahmadov",
"A. I.",
""
]
] |
We have investigated the contribution of the Higher Twist (HT) Feynman diagrams to the large-$p_T$ inclusive $\rho_L$ meson production cross section in proton-proton and proton-antiproton collisions and we discuss the phenomenological consequences of possible HT contributions to cross sections. To extract HT subprocesses from Leading Twist (LT) background, we use various $\rho_L$ meson distribution amplitudes(DAs). In the numerical calculations, the dependencies of the HT contribution on the transverse momentum and the rapidity are discussed with special emphasis on DAs. Analysis of our results shows that HT contributions decrease more rapidly than LT contributions with increasing $p_T$. The preceding results demonstrate that HT contributions must be considered especially in the region of low $p_T$ and the HT contribution to the cross-section depends on the choice of the meson distribution amplitudes.
|
1607.00395
|
Fernando Febres Cordero
|
Fernando Febres Cordero, Harald Ita
|
Di-vector Boson Production with Jets at the LHC
|
Contribution to the proceedings of Loops and Legs Workshop 2016
| null | null |
FR-PHENO-2016-010
|
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
In this talk we present the first calculation of next-to-leading-order QCD
corrections for the production of $W^+W^-$ pairs in association with three jets
at the LHC. We show the observed improvement in the dependence of total and
differential cross sections on the unphysical renormalization and factorization
scales. We study the radiation pattern for configurations associated to
vector-boson fusion and the impact that the QCD corrections have on them.
|
[
{
"created": "Fri, 1 Jul 2016 20:09:43 GMT",
"version": "v1"
}
] |
2016-07-05
|
[
[
"Cordero",
"Fernando Febres",
""
],
[
"Ita",
"Harald",
""
]
] |
In this talk we present the first calculation of next-to-leading-order QCD corrections for the production of $W^+W^-$ pairs in association with three jets at the LHC. We show the observed improvement in the dependence of total and differential cross sections on the unphysical renormalization and factorization scales. We study the radiation pattern for configurations associated to vector-boson fusion and the impact that the QCD corrections have on them.
|
hep-ph/9607435
|
Patrick Huet
|
Patrick Huet (University of Washington)
|
CPT Violation from Planck Scale Physics
|
6 pages, uses LaTeX, typographical errors corrected and references
added
| null | null |
UW/PT 96-11
|
hep-ph
| null |
I address the phenomenology of CPT violation in the neutral kaon system under
the assumption that it originates from Planck scale physics. This assumption
opens the door to a new set of CPT violating parameters whose phenomenology is
distinct from the $\Delta$ parameter usually considered in the Hamiltonian. The
origin of these parameters reflects a possible departure from a $S$-matrix
evolution. Existing bounds on CPT violation are near the expected range based
on naive dimensional analysis. This provides a strong incentive to pursue the
quest of CPT violation in near-future kaon experiments. (Talk given at the
Workshop on K Physics, Orsay, France, May 30 - June 4, 1996.)
|
[
{
"created": "Thu, 25 Jul 1996 20:55:44 GMT",
"version": "v1"
},
{
"created": "Fri, 26 Jul 1996 22:02:32 GMT",
"version": "v2"
},
{
"created": "Mon, 29 Jul 1996 20:39:52 GMT",
"version": "v3"
}
] |
2008-02-03
|
[
[
"Huet",
"Patrick",
"",
"University of Washington"
]
] |
I address the phenomenology of CPT violation in the neutral kaon system under the assumption that it originates from Planck scale physics. This assumption opens the door to a new set of CPT violating parameters whose phenomenology is distinct from the $\Delta$ parameter usually considered in the Hamiltonian. The origin of these parameters reflects a possible departure from a $S$-matrix evolution. Existing bounds on CPT violation are near the expected range based on naive dimensional analysis. This provides a strong incentive to pursue the quest of CPT violation in near-future kaon experiments. (Talk given at the Workshop on K Physics, Orsay, France, May 30 - June 4, 1996.)
|
hep-ph/9304296
| null |
Vittorio Del Duca and Wai-Keung Tang
|
Parton-Parton Elastic Scattering and Rapidity Gaps at Very High Energies
|
15 pages
|
Phys.Lett. B312 (1993) 225-231
|
10.1016/0370-2693(93)90515-J
| null |
hep-ph
| null |
The theory of the perturbative pomeron, due to Lipatov and collaborators, is
used to compute the probability of observing parton-parton elastic scattering
and rapidity gaps between jets in hadron collisions at very high energies.
|
[
{
"created": "Fri, 23 Apr 1993 23:41:00 GMT",
"version": "v1"
}
] |
2009-10-22
|
[
[
"Del Duca",
"Vittorio",
""
],
[
"Tang",
"Wai-Keung",
""
]
] |
The theory of the perturbative pomeron, due to Lipatov and collaborators, is used to compute the probability of observing parton-parton elastic scattering and rapidity gaps between jets in hadron collisions at very high energies.
|
2311.07663
|
Jiayin Gu
|
Jiayin Gu and Chi Shu
|
Probing positivity at the LHC with exclusive photon-fusion processes
|
17 pages, 4 figures. v2: references added, minor corrections
| null | null | null |
hep-ph hep-ex
|
http://creativecommons.org/licenses/by/4.0/
|
By tagging one or two intact protons in the forward direction, it is possible
to select and measure exclusive photon-fusion processes at the LHC. The same
processes can also be measured in heavy ion collisions, and are often denoted
as ultraperipheral collisions (UPC) processes. Such measurements open up the
possibility of probing certain dimension-8 operators and their positivity
bounds at the LHC. As a demonstration, we perform a phenomenological study on
the $\gamma\gamma\to \ell^+\ell^-$ processes, and find out that the
measurements of this process at the HL-LHC provide reaches on a set of
dimension-8 operator coefficients that are comparable to the ones at future
lepton colliders. We also point out that the $\gamma q\to \gamma q$ process
could potentially have better reaches on similar types of operators due to its
larger cross section, but a more detailed experimental study is need to
estimate the signal and background rates of this process. The validity of
effective field theory (EFT) and the robustness of the positivity
interpretation are also discussed.
|
[
{
"created": "Mon, 13 Nov 2023 19:00:15 GMT",
"version": "v1"
},
{
"created": "Thu, 18 Jan 2024 15:24:00 GMT",
"version": "v2"
}
] |
2024-01-19
|
[
[
"Gu",
"Jiayin",
""
],
[
"Shu",
"Chi",
""
]
] |
By tagging one or two intact protons in the forward direction, it is possible to select and measure exclusive photon-fusion processes at the LHC. The same processes can also be measured in heavy ion collisions, and are often denoted as ultraperipheral collisions (UPC) processes. Such measurements open up the possibility of probing certain dimension-8 operators and their positivity bounds at the LHC. As a demonstration, we perform a phenomenological study on the $\gamma\gamma\to \ell^+\ell^-$ processes, and find out that the measurements of this process at the HL-LHC provide reaches on a set of dimension-8 operator coefficients that are comparable to the ones at future lepton colliders. We also point out that the $\gamma q\to \gamma q$ process could potentially have better reaches on similar types of operators due to its larger cross section, but a more detailed experimental study is need to estimate the signal and background rates of this process. The validity of effective field theory (EFT) and the robustness of the positivity interpretation are also discussed.
|
hep-ph/0503135
|
Alexandre Alves
|
Alexandre Alves (Sao Paulo U.) and Tilman Plehn (Munich, Max Planck
Inst.)
|
Charged Higgs Boson Pairs at the LHC
|
15 pages with 8 figures
|
Phys.Rev.D71:115014,2005
|
10.1103/PhysRevD.71.115014
|
MPP-2005-15
|
hep-ph
| null |
We compute the cross section for pair production of charged Higgs bosons at
the LHC and compare the three production mechanisms. The bottom-parton
scattering process is computed to NLO, and the validity of the bottom-parton
approach is established in detail. The light-flavor Drell-Yan cross section is
evaluated at NLO as well. The gluon fusion process through a one-loop amplitude
is then compared with these two results. We show how a complete sample of
events could look, in terms of total cross sections and distributions of the
heavy final states.
|
[
{
"created": "Mon, 14 Mar 2005 21:04:25 GMT",
"version": "v1"
}
] |
2008-11-26
|
[
[
"Alves",
"Alexandre",
"",
"Sao Paulo U."
],
[
"Plehn",
"Tilman",
"",
"Munich, Max Planck\n Inst."
]
] |
We compute the cross section for pair production of charged Higgs bosons at the LHC and compare the three production mechanisms. The bottom-parton scattering process is computed to NLO, and the validity of the bottom-parton approach is established in detail. The light-flavor Drell-Yan cross section is evaluated at NLO as well. The gluon fusion process through a one-loop amplitude is then compared with these two results. We show how a complete sample of events could look, in terms of total cross sections and distributions of the heavy final states.
|
hep-ph/9611283
|
Agaev Shahin Sabir
|
Shahin S. Agaev
|
Single meson photoproduction and IR renormalons
|
20 pages, 8 figures
|
Eur.Phys.J.C1:321-331,1998
|
10.1007/s100520050085
|
ICTP preprint IC/96/217, November, 1996
|
hep-ph
| null |
Single pseudoscalar and vector mesons inclusive photoproduction $\gamma
h\rightarrow MX$ via higher twist mechanism is calculated using the QCD running
coupling constant method. It is proved that in the context of this method a
higher twist contribution to the photoproduction cross section cannot be
normalized in terms of the meson electromagnetic form factor. The structure of
infrared renormalon singularities of the higher twist subprocess cross section
and the resummed expression (the Borel sum) for it are found. Comparisons are
made with earlier results, as well as with leading twist cross section.
Phenomenological effects of studied contributions for $\pi, K, \rho$-meson
photoproduction are discussed.
|
[
{
"created": "Fri, 8 Nov 1996 16:12:15 GMT",
"version": "v1"
}
] |
2011-09-13
|
[
[
"Agaev",
"Shahin S.",
""
]
] |
Single pseudoscalar and vector mesons inclusive photoproduction $\gamma h\rightarrow MX$ via higher twist mechanism is calculated using the QCD running coupling constant method. It is proved that in the context of this method a higher twist contribution to the photoproduction cross section cannot be normalized in terms of the meson electromagnetic form factor. The structure of infrared renormalon singularities of the higher twist subprocess cross section and the resummed expression (the Borel sum) for it are found. Comparisons are made with earlier results, as well as with leading twist cross section. Phenomenological effects of studied contributions for $\pi, K, \rho$-meson photoproduction are discussed.
|
1506.03327
|
Francois Gelis
|
F. Gelis, N. Tanji
|
Quark production in heavy ion collisions I. Formalism and boost
invariant fermionic light-cone mode functions
|
40 pages, 3 figures, alternate derivation in the new appendix B
| null |
10.1007/JHEP02(2016)126
| null |
hep-ph nucl-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We revisit the problem of quark production in high energy heavy ion
collisions, at leading order in $\alpha_s$ in the color glass condensate
framework. In this first paper, we setup the formalism and express the quark
spectrum in terms of a set of mode functions of the Dirac equation. We
determine analytically their initial value in the Fock-Schwinger gauge on a
proper time surface $Q_s\tau_0\ll 1$, in a basis which makes manifest the boost
invariance properties of this problem. We also describe a statistical algorithm
to perform the sampling of the mode functions.
|
[
{
"created": "Wed, 10 Jun 2015 14:36:42 GMT",
"version": "v1"
},
{
"created": "Mon, 8 Feb 2016 11:12:13 GMT",
"version": "v2"
}
] |
2016-03-23
|
[
[
"Gelis",
"F.",
""
],
[
"Tanji",
"N.",
""
]
] |
We revisit the problem of quark production in high energy heavy ion collisions, at leading order in $\alpha_s$ in the color glass condensate framework. In this first paper, we setup the formalism and express the quark spectrum in terms of a set of mode functions of the Dirac equation. We determine analytically their initial value in the Fock-Schwinger gauge on a proper time surface $Q_s\tau_0\ll 1$, in a basis which makes manifest the boost invariance properties of this problem. We also describe a statistical algorithm to perform the sampling of the mode functions.
|
hep-ph/9905567
|
Jan Kwiecinski
|
J. Kwiecinski, L. Motyka
|
Probing the QCD pomeron in doubly tagged e^+ e^- collisions
|
12 pages, LaTeX, 3 figures
|
Phys.Lett. B462 (1999) 203-210
|
10.1016/S0370-2693(99)00866-7
| null |
hep-ph
| null |
We calculate the total cross-section for $\gamma^* \gamma^*$ collisions and
for the process $e^+ e^- \to e^+ e^- + hadrons$ with two tagged leptons
assuming dominance of the QCD pomeron exchange. We solve the BFKL equation
including the dominant subleading effects generated by the consistency
constraint which restricts the available phase-space of the emitted gluons to
the region inwhich the virtuality of the exchanged gluons is dominated by their
transverse momentum squared. Estimate of the possible soft pomeron contribution
to the $\gamma^* \gamma^*$ cross-section is also presented. At very high CM
energies $W$ the calculated total $\gamma^* \gamma^*$ cross-section exhibits
effective power-law $(W^2)^{\lambda}$ behaviour with $\lambda \sim 0.3$. We
confront our results with the recent measurements at LEP and give predictions
for the energies which can be accessible at TESLA and at other future linear
$e^+ e^-$ colliders.
|
[
{
"created": "Mon, 31 May 1999 14:42:43 GMT",
"version": "v1"
}
] |
2009-10-31
|
[
[
"Kwiecinski",
"J.",
""
],
[
"Motyka",
"L.",
""
]
] |
We calculate the total cross-section for $\gamma^* \gamma^*$ collisions and for the process $e^+ e^- \to e^+ e^- + hadrons$ with two tagged leptons assuming dominance of the QCD pomeron exchange. We solve the BFKL equation including the dominant subleading effects generated by the consistency constraint which restricts the available phase-space of the emitted gluons to the region inwhich the virtuality of the exchanged gluons is dominated by their transverse momentum squared. Estimate of the possible soft pomeron contribution to the $\gamma^* \gamma^*$ cross-section is also presented. At very high CM energies $W$ the calculated total $\gamma^* \gamma^*$ cross-section exhibits effective power-law $(W^2)^{\lambda}$ behaviour with $\lambda \sim 0.3$. We confront our results with the recent measurements at LEP and give predictions for the energies which can be accessible at TESLA and at other future linear $e^+ e^-$ colliders.
|
hep-ph/0607281
|
Joseph Baker
|
Joseph L. Baker, Haim Goldberg, Gilad Perez, Ina Sarcevic
|
Probing Late Neutrino Mass Properties with Supernova Neutrinos
|
29 pages latex, 15 figures included. Version to be published in Phys.
Rev. D., added discussion of signal detection for water Cerenkov and liquid
argon detectors, and discussion of non-adiabatic vs adiabatic neutrino
evolution, new figures added, references updated. Results unchanged
|
Phys.Rev.D76:063004,2007
|
10.1103/PhysRevD.76.063004
| null |
hep-ph astro-ph
| null |
Models of late-time neutrino mass generation contain new interactions of the
cosmic background neutrinos with supernova relic neutrinos (SRNs) through
exchange of the on-shell light boson, leading to significant modification of
the differential SRN flux observed at earth. We consider Abelian U(1) model for
generating neutrino masses at low scales and we show that there is a large
parameter space in this model for which the changes induced in the flux by the
exchange of the light bosons might allow one to distinguish between neutrinos
being Majorana or Dirac particles, the type of neutrino mass hierarchy (normal
or inverted or quasi-degenerate), and could also possibly determine the
absolute values of the neutrino masses. Measurements of the presence of these
effects would be possible at the next-generation water Cerenkov detectors
enriched with Gadolinium, or a large 100 kton liquid argon detector.
|
[
{
"created": "Wed, 26 Jul 2006 19:56:32 GMT",
"version": "v1"
},
{
"created": "Mon, 4 Dec 2006 22:47:24 GMT",
"version": "v2"
},
{
"created": "Wed, 8 Aug 2007 17:35:31 GMT",
"version": "v3"
}
] |
2008-11-26
|
[
[
"Baker",
"Joseph L.",
""
],
[
"Goldberg",
"Haim",
""
],
[
"Perez",
"Gilad",
""
],
[
"Sarcevic",
"Ina",
""
]
] |
Models of late-time neutrino mass generation contain new interactions of the cosmic background neutrinos with supernova relic neutrinos (SRNs) through exchange of the on-shell light boson, leading to significant modification of the differential SRN flux observed at earth. We consider Abelian U(1) model for generating neutrino masses at low scales and we show that there is a large parameter space in this model for which the changes induced in the flux by the exchange of the light bosons might allow one to distinguish between neutrinos being Majorana or Dirac particles, the type of neutrino mass hierarchy (normal or inverted or quasi-degenerate), and could also possibly determine the absolute values of the neutrino masses. Measurements of the presence of these effects would be possible at the next-generation water Cerenkov detectors enriched with Gadolinium, or a large 100 kton liquid argon detector.
|
2102.03631
|
Stefan Nellen
|
Leon M.G. de la Vega, Newton Nath, Stefan Nellen, Eduardo Peinado
|
Flavored axion in the UV-complete Froggatt-Nielsen models
|
24 pages, 4 figures, 5 tables. Version to appear in the EPJC
| null |
10.1140/epjc/s10052-021-09410-3
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We propose UV-completions of Froggatt-Nielsen-Peccei-Quinn models of fermion
masses and mixings with flavored axions, by incorporating heavy fields. Here,
the $U(1)$ Froggatt-Nielsen symmetry is identified with the Peccei-Quinn
symmetry to solve the strong CP problem along with the mass hierarchies of the
Standard Model fermions. We take into account leading order contributions to
the fermion mass matrices giving rise to Nearest-Neighbour-Interaction
structure in the quark sector and $A_2$ texture in the neutrino sector. A
comprehensive numerical analysis has been performed for the fermion mass
matrices. Subsequently, we investigate the resulting axion flavor violating
couplings and the axion-photon coupling arising from the model.
|
[
{
"created": "Sat, 6 Feb 2021 18:18:14 GMT",
"version": "v1"
},
{
"created": "Mon, 12 Jul 2021 23:02:34 GMT",
"version": "v2"
}
] |
2021-07-14
|
[
[
"de la Vega",
"Leon M. G.",
""
],
[
"Nath",
"Newton",
""
],
[
"Nellen",
"Stefan",
""
],
[
"Peinado",
"Eduardo",
""
]
] |
We propose UV-completions of Froggatt-Nielsen-Peccei-Quinn models of fermion masses and mixings with flavored axions, by incorporating heavy fields. Here, the $U(1)$ Froggatt-Nielsen symmetry is identified with the Peccei-Quinn symmetry to solve the strong CP problem along with the mass hierarchies of the Standard Model fermions. We take into account leading order contributions to the fermion mass matrices giving rise to Nearest-Neighbour-Interaction structure in the quark sector and $A_2$ texture in the neutrino sector. A comprehensive numerical analysis has been performed for the fermion mass matrices. Subsequently, we investigate the resulting axion flavor violating couplings and the axion-photon coupling arising from the model.
|
hep-ph/9702420
|
Joao Soares
|
Joao M. Soares and Tibor Torma (Univ. of Massachusetts - Amherst)
|
QCD corrections to B -> J/psi + anything
|
13 pages, 3 figures, Latex, uses epsfig and axodraw
|
Phys.Rev. D56 (1997) 1632-1637
|
10.1103/PhysRevD.56.1632
|
UMHEP-438
|
hep-ph
| null |
We calculate the branching ratio for B -> J/psi + anything, within the
color-singlet approximation for J/psi production, but including perturbative
QCD corrections beyond the leading logarithm approximation. Such higher order
corrections are necessary, in order to obtain a result that is not strongly
dependent on the renormalization scale. As in the earlier work of Bergstrom and
Ernstrom, we use a double expansion in alpha_s and in the small ratio of Wilson
coefficients L_0/L_2, to identify the dominant terms in the decay amplitude. We
complete their work by calculating all the leading order terms in this double
expansion. The predicted branching ratio is then BR(B -> J/psi + anything) =
0.09 (+1.1)(-0.3) %, which is well below the experimental value
BR(experimental) = 0.80 (+-0.08) %. This confirms the suspicion that
non-perturbative corrections to the color-singlet approximation for J/psi
production in B decays are important.
|
[
{
"created": "Tue, 25 Feb 1997 21:03:44 GMT",
"version": "v1"
}
] |
2009-10-30
|
[
[
"Soares",
"Joao M.",
"",
"Univ. of Massachusetts - Amherst"
],
[
"Torma",
"Tibor",
"",
"Univ. of Massachusetts - Amherst"
]
] |
We calculate the branching ratio for B -> J/psi + anything, within the color-singlet approximation for J/psi production, but including perturbative QCD corrections beyond the leading logarithm approximation. Such higher order corrections are necessary, in order to obtain a result that is not strongly dependent on the renormalization scale. As in the earlier work of Bergstrom and Ernstrom, we use a double expansion in alpha_s and in the small ratio of Wilson coefficients L_0/L_2, to identify the dominant terms in the decay amplitude. We complete their work by calculating all the leading order terms in this double expansion. The predicted branching ratio is then BR(B -> J/psi + anything) = 0.09 (+1.1)(-0.3) %, which is well below the experimental value BR(experimental) = 0.80 (+-0.08) %. This confirms the suspicion that non-perturbative corrections to the color-singlet approximation for J/psi production in B decays are important.
|
1703.08148
|
Carolina Arbelaez
|
Carolina Arbel\'aez, Martin Hirsch, Diego Restrepo
|
Fermionic triplet dark matter in an $SO(10)$-inspired left right model
| null |
Phys. Rev. D 95, 095034 (2017)
|
10.1103/PhysRevD.95.095034
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We study a left right (LR) extension of the Standard Model (SM) where the
Dark Matter (DM) candidate is composed of a set of fermionic Majorana triplets.
The DM is stabilized by a remnant $Z_{2}$ symmetry from the breaking of the LR
group to the SM. Two simple scenarios where the DM particles plus a certain set
of extra fields lead to gauge coupling unification with a low LR scale are
explored. The constraints from relic density and predictions for direct
detection are discussed for both scenarios. The first scenario with a $SU(2)_R$
vectorlike fermion triplet contains a DM candidate which is almost
unconstrained by current direct detection experiments. The second scenario,
with an additional $SU(2)_R$ triplet, opens up a scalar portal leading to
direct detection constraints which are similar to collider limits for right
gauge bosons. The DM parameter space consistent with phenomenological
requirements can also lead to successful gauge coupling unification in a
$SO(10)$ setup.
|
[
{
"created": "Thu, 23 Mar 2017 17:21:14 GMT",
"version": "v1"
},
{
"created": "Tue, 9 May 2017 16:19:59 GMT",
"version": "v2"
}
] |
2017-06-07
|
[
[
"Arbeláez",
"Carolina",
""
],
[
"Hirsch",
"Martin",
""
],
[
"Restrepo",
"Diego",
""
]
] |
We study a left right (LR) extension of the Standard Model (SM) where the Dark Matter (DM) candidate is composed of a set of fermionic Majorana triplets. The DM is stabilized by a remnant $Z_{2}$ symmetry from the breaking of the LR group to the SM. Two simple scenarios where the DM particles plus a certain set of extra fields lead to gauge coupling unification with a low LR scale are explored. The constraints from relic density and predictions for direct detection are discussed for both scenarios. The first scenario with a $SU(2)_R$ vectorlike fermion triplet contains a DM candidate which is almost unconstrained by current direct detection experiments. The second scenario, with an additional $SU(2)_R$ triplet, opens up a scalar portal leading to direct detection constraints which are similar to collider limits for right gauge bosons. The DM parameter space consistent with phenomenological requirements can also lead to successful gauge coupling unification in a $SO(10)$ setup.
|
1212.3250
|
Timothy Burns
|
T. J. Burns
|
Hyperfine splitting and the experimental candidates for \eta_b(2S)
|
8 pages, 1 figure. Journal version with an additional reference added
| null |
10.1103/PhysRevD.87.034022
| null |
hep-ph hep-ex
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Predictions for the hyperfine splitting of 2S bottomonia are compared with
the two recent experimental candidates for the \eta_b(2S). The smaller
splitting of the Belle state is consistent with unquenched lattice QCD
computations, many potential models, and a model-independent relation which
works well for charmonia. The larger splitting for the state extracted from
CLEO data is inconsistent with most predictions.
|
[
{
"created": "Thu, 13 Dec 2012 18:17:11 GMT",
"version": "v1"
},
{
"created": "Wed, 29 May 2013 10:35:27 GMT",
"version": "v2"
}
] |
2013-05-30
|
[
[
"Burns",
"T. J.",
""
]
] |
Predictions for the hyperfine splitting of 2S bottomonia are compared with the two recent experimental candidates for the \eta_b(2S). The smaller splitting of the Belle state is consistent with unquenched lattice QCD computations, many potential models, and a model-independent relation which works well for charmonia. The larger splitting for the state extracted from CLEO data is inconsistent with most predictions.
|
1709.09631
|
A. D. Polosa
|
A. Esposito, B. Grinstein, L. Maiani, F. Piccinini, A. Pilloni, A.D.
Polosa and V. Riquer
|
Comment on `Note on X(3872) production at hadron colliders and its
molecular structure'
|
This paper was prepared at the request of a journal editor. 3 Pages,
no figures
| null |
10.1088/1674-1137/42/11/114107
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We briefly comment on the paper by Albaladejo et al. [arXiv:1709.09101],
rejecting its conclusions.
|
[
{
"created": "Wed, 27 Sep 2017 17:14:24 GMT",
"version": "v1"
}
] |
2019-02-22
|
[
[
"Esposito",
"A.",
""
],
[
"Grinstein",
"B.",
""
],
[
"Maiani",
"L.",
""
],
[
"Piccinini",
"F.",
""
],
[
"Pilloni",
"A.",
""
],
[
"Polosa",
"A. D.",
""
],
[
"Riquer",
"V.",
""
]
] |
We briefly comment on the paper by Albaladejo et al. [arXiv:1709.09101], rejecting its conclusions.
|
0810.2679
|
Viviana Niro
|
E. Kh. Akhmedov, Viviana Niro
|
An accurate analytic description of neutrino oscillations in matter
|
16 pages,6 figures
|
JHEP 0812:106,2008
|
10.1088/1126-6708/2008/12/106
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
A simple closed-form analytic expression for the probability of two-flavour
neutrino oscillations in a matter with an arbitrary density profile is derived.
Our formula is based on a perturbative expansion and allows an easy calculation
of higher order corrections. The expansion parameter is small when the density
changes relatively slowly along the neutrino path and/or neutrino energy is not
very close to the Mikheyev-Smirnov-Wolfenstein (MSW) resonance energy. Our
approximation is not equivalent to the adiabatic approximation and actually
goes beyond it. We demonstrate the validity of our results using a few model
density profiles, including the PREM density profile of the Earth. It is shown
that by combining the results obtained from the expansions valid below and
above the MSW resonance one can obtain a very good description of neutrino
oscillations in matter in the entire energy range, including the resonance
region.
|
[
{
"created": "Wed, 15 Oct 2008 12:13:11 GMT",
"version": "v1"
},
{
"created": "Mon, 22 Dec 2008 15:24:59 GMT",
"version": "v2"
}
] |
2009-01-14
|
[
[
"Akhmedov",
"E. Kh.",
""
],
[
"Niro",
"Viviana",
""
]
] |
A simple closed-form analytic expression for the probability of two-flavour neutrino oscillations in a matter with an arbitrary density profile is derived. Our formula is based on a perturbative expansion and allows an easy calculation of higher order corrections. The expansion parameter is small when the density changes relatively slowly along the neutrino path and/or neutrino energy is not very close to the Mikheyev-Smirnov-Wolfenstein (MSW) resonance energy. Our approximation is not equivalent to the adiabatic approximation and actually goes beyond it. We demonstrate the validity of our results using a few model density profiles, including the PREM density profile of the Earth. It is shown that by combining the results obtained from the expansions valid below and above the MSW resonance one can obtain a very good description of neutrino oscillations in matter in the entire energy range, including the resonance region.
|
0712.3359
|
Sergey Troshin
|
S.M. Troshin
|
Comment on the "extended eikonal" unitarization
|
4 pages, 3 figures
| null | null | null |
hep-ph
| null |
This is a comment on the recent paper by O.V. Selyugin, J.-R. Cudell, and E.
Predazzi "Analytic properties of different unitarization schemes" arXiv:
0712.0621v2, [hep-ph]
|
[
{
"created": "Thu, 20 Dec 2007 10:09:49 GMT",
"version": "v1"
},
{
"created": "Wed, 9 Jan 2008 12:37:30 GMT",
"version": "v2"
}
] |
2008-01-09
|
[
[
"Troshin",
"S. M.",
""
]
] |
This is a comment on the recent paper by O.V. Selyugin, J.-R. Cudell, and E. Predazzi "Analytic properties of different unitarization schemes" arXiv: 0712.0621v2, [hep-ph]
|
1012.1342
|
Yogiro Hama
|
Yogiro Hama, Rone Peterson G. Andrade, Frederique Grassi and Wei-Liang
Qian
|
Fluctuating initial conditions in hydrodynamics for two-particle
correlations
|
6 pages, 4 figures, presented at ISMD2010, 21-25 September, 2010,
University of Antwerp (Belgium)
| null | null | null |
hep-ph nucl-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Event-by-event hydrodynamics, with fluctuating initial conditions, has shown
to nicely reproduce several features of experimentally observed quantities in
high-energy nuclear collisions. Here we discuss how it may help to understand,
in a unified way, the various structures observed in the long-range
two-particle correlations, both in nucleus-nucleus and p-p collisions.
Suggestions of how experimentally this description could be tested are also
discussed.
|
[
{
"created": "Mon, 6 Dec 2010 21:27:47 GMT",
"version": "v1"
}
] |
2015-03-17
|
[
[
"Hama",
"Yogiro",
""
],
[
"Andrade",
"Rone Peterson G.",
""
],
[
"Grassi",
"Frederique",
""
],
[
"Qian",
"Wei-Liang",
""
]
] |
Event-by-event hydrodynamics, with fluctuating initial conditions, has shown to nicely reproduce several features of experimentally observed quantities in high-energy nuclear collisions. Here we discuss how it may help to understand, in a unified way, the various structures observed in the long-range two-particle correlations, both in nucleus-nucleus and p-p collisions. Suggestions of how experimentally this description could be tested are also discussed.
|
hep-ph/0312001
|
Nikolai Uraltsev
|
Nikolai Uraltsev
|
A "BPS expansion" for B and D mesons
|
13 pages, LaTeX, two figures
|
Phys.Lett.B585:253-262,2004
|
10.1016/j.physletb.2004.01.053
|
Bicocca-FT-03-32, UND-HEP-03-BIG07
|
hep-ph
| null |
We analyze consequences of the approximation \mu_\pi^2 -\mu_G^2 << \mu_\pi^2
(a `BPS' limit) for B and D mesons. It is shown that neglecting perturbative
effects many power corrections would vanish to all orders in 1/m_Q, in
particular those violating heavy flavor symmetry. Among them are corrections to
B->D formfactors. A number of relations receive corrections only to the second
order expanding around the BPS limit to any order in 1/m_Q, including both f_+
and f_- at zero recoil. This allows an accurate evaluation of {\cal F}_+ for
B->D l\nu. Its perturbative renormalization is computed analytically in the
required Wilsonian scheme, yielding the dominant 3% enhancement.
|
[
{
"created": "Sun, 30 Nov 2003 12:57:31 GMT",
"version": "v1"
}
] |
2014-11-17
|
[
[
"Uraltsev",
"Nikolai",
""
]
] |
We analyze consequences of the approximation \mu_\pi^2 -\mu_G^2 << \mu_\pi^2 (a `BPS' limit) for B and D mesons. It is shown that neglecting perturbative effects many power corrections would vanish to all orders in 1/m_Q, in particular those violating heavy flavor symmetry. Among them are corrections to B->D formfactors. A number of relations receive corrections only to the second order expanding around the BPS limit to any order in 1/m_Q, including both f_+ and f_- at zero recoil. This allows an accurate evaluation of {\cal F}_+ for B->D l\nu. Its perturbative renormalization is computed analytically in the required Wilsonian scheme, yielding the dominant 3% enhancement.
|
hep-ph/9502276
|
Tom Gould
|
C. Hu, S. Matinyan, B. Muller, A. Trayanov, T. Gould, S. Hsu, and E.
Poppitz
|
Wavepacket Dynamics in Yang-Mills Theory
|
11 pgs. text, 11 optional figs using PiCTeX and epsf, new version
contains improved discussion of scaling properties of results and one
additional figure.
|
Phys.Rev.D52:2402-2411,1995
|
10.1103/PhysRevD.52.2402
|
DUKE-TH-95-85, JHU-TIPAC-950004, YCTP-P4-95, EFI-95-06
|
hep-ph
| null |
We discuss the results of numerical simulations of colliding wavepackets in
$SU(2)$ Yang--Mills theory. We investigate their behavior as a function of
amplitude and momentum distribution. We find regions in our parameter space in
which initial wave packets scatter into final configurations with dramatically
different momentum distributions. These results constitute new classical
trajectories with multiparticle boundary conditions. We explain their relevance
for the calculation of scattering amplitudes in the semiclassical
approximation. Finally, we give directions for future work.
|
[
{
"created": "Sun, 12 Feb 1995 22:19:47 GMT",
"version": "v1"
},
{
"created": "Sun, 26 Mar 1995 03:19:38 GMT",
"version": "v2"
}
] |
2008-11-26
|
[
[
"Hu",
"C.",
""
],
[
"Matinyan",
"S.",
""
],
[
"Muller",
"B.",
""
],
[
"Trayanov",
"A.",
""
],
[
"Gould",
"T.",
""
],
[
"Hsu",
"S.",
""
],
[
"Poppitz",
"E.",
""
]
] |
We discuss the results of numerical simulations of colliding wavepackets in $SU(2)$ Yang--Mills theory. We investigate their behavior as a function of amplitude and momentum distribution. We find regions in our parameter space in which initial wave packets scatter into final configurations with dramatically different momentum distributions. These results constitute new classical trajectories with multiparticle boundary conditions. We explain their relevance for the calculation of scattering amplitudes in the semiclassical approximation. Finally, we give directions for future work.
|
1103.2659
|
Shoaib Munir
|
Jens Erler, Paul Langacker, Shoaib Munir, Eduardo Rojas
|
Z' Bosons at Colliders: a Bayesian Viewpoint
|
PDFLaTeX, 24 pages, 7 figures. Version with improved tables and
figures
|
JHEP 1111 (2011) 076
|
10.1007/JHEP11(2011)076
| null |
hep-ph hep-ex
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We revisit the CDF data on di-muon production to impose constraints on a
large class of Z' bosons occurring in a variety of E_6 GUT based models. We
analyze the dependence of these limits on various factors contributing to the
production cross-section, showing that currently systematic and theoretical
uncertainties play a relatively minor role. Driven by this observation, we
emphasize the use of the Bayesian statistical method, which allows us to
straightforwardly (i) vary the gauge coupling strength, g', of the underlying
U(1)'; (ii) include interference effects with the Z' amplitude (which are
especially important for large g'); (iii) smoothly vary the U(1)' charges; (iv)
combine these data with the electroweak precision constraints as well as with
other observables obtained from colliders such as LEP 2 and the LHC; and (v)
find preferred regions in parameter space once an excess is seen. We adopt this
method as a complementary approach for a couple of sample models and find
limits on the Z' mass, generally differing by only a few percent from the
corresponding CDF ones when we follow their approach. Another general result is
that the interference effects are quite relevant if one aims at discriminating
between models. Finally, the Bayesian approach frees us of any ad hoc
assumptions about the number of events needed to constitute a signal or
exclusion limit for various actual and hypothetical reference energies and
luminosities at the Tevatron and the LHC.
|
[
{
"created": "Mon, 14 Mar 2011 13:29:40 GMT",
"version": "v1"
},
{
"created": "Wed, 26 Oct 2011 15:17:17 GMT",
"version": "v2"
}
] |
2015-05-27
|
[
[
"Erler",
"Jens",
""
],
[
"Langacker",
"Paul",
""
],
[
"Munir",
"Shoaib",
""
],
[
"Rojas",
"Eduardo",
""
]
] |
We revisit the CDF data on di-muon production to impose constraints on a large class of Z' bosons occurring in a variety of E_6 GUT based models. We analyze the dependence of these limits on various factors contributing to the production cross-section, showing that currently systematic and theoretical uncertainties play a relatively minor role. Driven by this observation, we emphasize the use of the Bayesian statistical method, which allows us to straightforwardly (i) vary the gauge coupling strength, g', of the underlying U(1)'; (ii) include interference effects with the Z' amplitude (which are especially important for large g'); (iii) smoothly vary the U(1)' charges; (iv) combine these data with the electroweak precision constraints as well as with other observables obtained from colliders such as LEP 2 and the LHC; and (v) find preferred regions in parameter space once an excess is seen. We adopt this method as a complementary approach for a couple of sample models and find limits on the Z' mass, generally differing by only a few percent from the corresponding CDF ones when we follow their approach. Another general result is that the interference effects are quite relevant if one aims at discriminating between models. Finally, the Bayesian approach frees us of any ad hoc assumptions about the number of events needed to constitute a signal or exclusion limit for various actual and hypothetical reference energies and luminosities at the Tevatron and the LHC.
|
hep-ph/0702216
|
Nestor Armesto
|
N. Armesto, M. A. Braun and C. Pajares
|
On the long-range correlations in hadron-nucleus collisions
|
17 pages, LaTeX, 6 eps figures included using graphicx; v2: error in
the CGC formula corrected, conclusions of the corresponding section changed
accordingly
|
Phys.Rev.C75:054902,2007
|
10.1103/PhysRevC.75.054902
| null |
hep-ph
| null |
Long-range correlations between multiplicities in different rapidity windows
in hadron-nucleus collisions are analyzed. After recalling the standard results
in the probabilistic model, we study them in the framework of perturbative QCD.
Considering interacting BFKL pomerons in the form of fan diagrams coupled to a
dilute projectile, analytic estimates are done for very large rapidities. The
correlation strength results weakly depending on energy and centrality or
nuclear size, and generically greater than unity. Finally, we turn to the Color
Glass Condensate framework. For a saturated projectile and considering the most
feasible experimental situation of forward and backward rapidity windows
symmetric around the center-of-mass, the resulting correlation strength turns
out to be larger than unity and shows a non-monotonic behavior with increasing
energy, first increasing and then decreasing to a limiting value. Its behavior
with increasing centrality or nuclear size depends on the considered rapidity
windows.
|
[
{
"created": "Wed, 21 Feb 2007 12:23:44 GMT",
"version": "v1"
},
{
"created": "Wed, 14 Mar 2007 11:52:39 GMT",
"version": "v2"
}
] |
2008-11-26
|
[
[
"Armesto",
"N.",
""
],
[
"Braun",
"M. A.",
""
],
[
"Pajares",
"C.",
""
]
] |
Long-range correlations between multiplicities in different rapidity windows in hadron-nucleus collisions are analyzed. After recalling the standard results in the probabilistic model, we study them in the framework of perturbative QCD. Considering interacting BFKL pomerons in the form of fan diagrams coupled to a dilute projectile, analytic estimates are done for very large rapidities. The correlation strength results weakly depending on energy and centrality or nuclear size, and generically greater than unity. Finally, we turn to the Color Glass Condensate framework. For a saturated projectile and considering the most feasible experimental situation of forward and backward rapidity windows symmetric around the center-of-mass, the resulting correlation strength turns out to be larger than unity and shows a non-monotonic behavior with increasing energy, first increasing and then decreasing to a limiting value. Its behavior with increasing centrality or nuclear size depends on the considered rapidity windows.
|
2306.10642
|
Fernando Navarra
|
R. Fariello, D. Bhandari, C.A. Bertulani and F.S. Navarra
|
Two and three photon fusion into charmonium in ultra-peripheral nuclear
collisions
|
7 pages, 3 tables. arXiv admin note: text overlap with
arXiv:1610.06604
| null | null | null |
hep-ph nucl-th
|
http://creativecommons.org/licenses/by/4.0/
|
In this paper we investigate the production of charmonium states in two and
three photon fusion processes in nucleus -- nucleus collisions at the CERN
Large Hadron Collider (LHC) energies. Our results indicate that the
experimental study of these processes is feasible and can be used to constrain
the theoretical decay widths and give information on the non $c - \bar{c}$
components of these states.
|
[
{
"created": "Sun, 18 Jun 2023 21:46:00 GMT",
"version": "v1"
}
] |
2023-06-21
|
[
[
"Fariello",
"R.",
""
],
[
"Bhandari",
"D.",
""
],
[
"Bertulani",
"C. A.",
""
],
[
"Navarra",
"F. S.",
""
]
] |
In this paper we investigate the production of charmonium states in two and three photon fusion processes in nucleus -- nucleus collisions at the CERN Large Hadron Collider (LHC) energies. Our results indicate that the experimental study of these processes is feasible and can be used to constrain the theoretical decay widths and give information on the non $c - \bar{c}$ components of these states.
|
0809.4566
|
Peter Renton
|
Peter Renton
|
Global Electroweak Fits and the Higgs Boson Mass
|
ICHEP08
| null | null | null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
The current electroweak data and the constraints on the Higgs mass are
discussed. Within the context of the Standard Model the data prefer a
relatively light Higgs mass.
|
[
{
"created": "Fri, 26 Sep 2008 09:06:33 GMT",
"version": "v1"
}
] |
2008-09-29
|
[
[
"Renton",
"Peter",
""
]
] |
The current electroweak data and the constraints on the Higgs mass are discussed. Within the context of the Standard Model the data prefer a relatively light Higgs mass.
|
1707.01710
|
Andrey Pikelner
|
Andrey Pikelner
|
FMFT: Fully Massive Four-loop Tadpoles
|
Available for download from https://github.com/apik/fmft/
|
Comput.Phys.Commun. 224 (2018) 282-287
|
10.1016/j.cpc.2017.11.017
|
DESY 17-098
|
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We present FMFT - a package written in FORM that evaluates four-loop fully
massive tadpole Feynman diagrams. It is a successor of the MATAD package that
has been successfully used to calculate many renormalization group functions at
three-loop order in a wide range of quantum field theories especially in the
Standard Model. We describe an internal structure of the package and provide
some examples of its usage.
|
[
{
"created": "Thu, 6 Jul 2017 09:53:52 GMT",
"version": "v1"
},
{
"created": "Fri, 2 Feb 2018 11:12:20 GMT",
"version": "v2"
}
] |
2018-02-05
|
[
[
"Pikelner",
"Andrey",
""
]
] |
We present FMFT - a package written in FORM that evaluates four-loop fully massive tadpole Feynman diagrams. It is a successor of the MATAD package that has been successfully used to calculate many renormalization group functions at three-loop order in a wide range of quantum field theories especially in the Standard Model. We describe an internal structure of the package and provide some examples of its usage.
|
hep-ph/0609261
|
Nikolay Achasov
|
N.N. Achasov
|
Properties of the light scalar mesons face experimental data
|
12 pages, 6 figures, a few typos are removed, Plenary session talk at
QUARKS-2006,Repino, St.Peterburg, May 19-25, 2006
| null | null | null |
hep-ph hep-ex nucl-th
| null |
The following topics are considered. 1) Confinement, chiral dynamics, and
light scalar mesons. 2) Chiral shielding of the \sigma(600) 3)The \phi meson
radiative decays about nature of light scalar resonances. 4) The J/\psi decays
about nature of light scalar resonances. 5) The a0(980)\to\gamma\gamma and
f0(980)\to\gamma\gamma decays about nature of light scalar resonances. 6) New
round in \gamma\gamma\to\pi^+\pi^-, the Belle data. 7) The a0(980)-f0(980)
mixing: theory and experiment. Arguments in favor of the four-quark model of
the a0(980) and f0(980) mesons are given.
|
[
{
"created": "Tue, 26 Sep 2006 03:52:25 GMT",
"version": "v1"
},
{
"created": "Tue, 5 Dec 2006 03:43:10 GMT",
"version": "v2"
}
] |
2007-05-23
|
[
[
"Achasov",
"N. N.",
""
]
] |
The following topics are considered. 1) Confinement, chiral dynamics, and light scalar mesons. 2) Chiral shielding of the \sigma(600) 3)The \phi meson radiative decays about nature of light scalar resonances. 4) The J/\psi decays about nature of light scalar resonances. 5) The a0(980)\to\gamma\gamma and f0(980)\to\gamma\gamma decays about nature of light scalar resonances. 6) New round in \gamma\gamma\to\pi^+\pi^-, the Belle data. 7) The a0(980)-f0(980) mixing: theory and experiment. Arguments in favor of the four-quark model of the a0(980) and f0(980) mesons are given.
|
2102.00379
|
Frederick Hiskens
|
Matthew J. Dolan, Frederick J. Hiskens, Raymond R. Volkas
|
Constraining axion-like particles using the white dwarf initial-final
mass relation
|
40 pages, 20 figures. Matches published version. New content added,
primarily in Section 4.2, 4.5
|
JCAP 09 (2021) 010
|
10.1088/1475-7516/2021/09/010
| null |
hep-ph astro-ph.HE astro-ph.SR
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Axion-like particles (ALPs), a class of pseudoscalars common to many
extensions of the Standard Model, have the capacity to drain energy from the
interiors of stars. Consequently, stellar evolution can be used to derive many
constraints on ALPs. We study the influence that keV-MeV scale ALPs which
interact exclusively with photons can exert on the helium-burning shells of
asymptotic giant branch stars, the late-life evolutionary phase of stars with
initial masses less than $8M_{\odot}$. We establish the sensitivity of the
final stellar mass to such energy-loss for ALPs with masses currently permitted
by stellar evolution bounds. A semi-empirical constraint on the white dwarf
initial-final mass relation (IFMR) derived from observation of double white
dwarf binaries is then used to exclude part of a currently unconstrained region
of ALP parameter space, the cosmological triangle. The derived constraint
relaxes when the ALP decay length becomes shorter than the width of the
helium-burning shell. Other potential sources for stellar constraints on ALPs
are also discussed.
|
[
{
"created": "Sun, 31 Jan 2021 05:05:19 GMT",
"version": "v1"
},
{
"created": "Wed, 15 Sep 2021 10:42:09 GMT",
"version": "v2"
}
] |
2021-09-16
|
[
[
"Dolan",
"Matthew J.",
""
],
[
"Hiskens",
"Frederick J.",
""
],
[
"Volkas",
"Raymond R.",
""
]
] |
Axion-like particles (ALPs), a class of pseudoscalars common to many extensions of the Standard Model, have the capacity to drain energy from the interiors of stars. Consequently, stellar evolution can be used to derive many constraints on ALPs. We study the influence that keV-MeV scale ALPs which interact exclusively with photons can exert on the helium-burning shells of asymptotic giant branch stars, the late-life evolutionary phase of stars with initial masses less than $8M_{\odot}$. We establish the sensitivity of the final stellar mass to such energy-loss for ALPs with masses currently permitted by stellar evolution bounds. A semi-empirical constraint on the white dwarf initial-final mass relation (IFMR) derived from observation of double white dwarf binaries is then used to exclude part of a currently unconstrained region of ALP parameter space, the cosmological triangle. The derived constraint relaxes when the ALP decay length becomes shorter than the width of the helium-burning shell. Other potential sources for stellar constraints on ALPs are also discussed.
|
hep-ph/9405319
|
Jose Ramon
|
J.R.Espinosa
|
The Electroweak Phase Transition in Extended Models
|
13 pages + 3 ps-figures, LATEX, IEM-FT-85/94
| null | null | null |
hep-ph
| null |
We study the possibility of relaxing the cosmological bound on the Higgs mass
coming from the requirement of non-erasure of the baryon asymmetry by
sphalerons. After reviewing the Standard Model case we obtain this bound in two
extensions of it: 1) The Standard Model with an additional gauge singlet, and
2) The Minimal Supersymmetric Standard Model. Taking fully into account all
experimental constraints and thermal screening effects we found that the
situation can be slightly improved with respect to the Standard Model but only
in case 1) a non negligible region in parameter space exists where the baryon
washout is avoided and the experimental bounds evaded. (Talk given at the NATO
Advanced Reseach Workshop: "Electroweak Physics and the early Universe", 23-25
March 1994, Sintra (Portugal).)
|
[
{
"created": "Wed, 18 May 1994 12:11:28 GMT",
"version": "v1"
}
] |
2009-09-25
|
[
[
"Espinosa",
"J. R.",
""
]
] |
We study the possibility of relaxing the cosmological bound on the Higgs mass coming from the requirement of non-erasure of the baryon asymmetry by sphalerons. After reviewing the Standard Model case we obtain this bound in two extensions of it: 1) The Standard Model with an additional gauge singlet, and 2) The Minimal Supersymmetric Standard Model. Taking fully into account all experimental constraints and thermal screening effects we found that the situation can be slightly improved with respect to the Standard Model but only in case 1) a non negligible region in parameter space exists where the baryon washout is avoided and the experimental bounds evaded. (Talk given at the NATO Advanced Reseach Workshop: "Electroweak Physics and the early Universe", 23-25 March 1994, Sintra (Portugal).)
|
hep-ph/0208147
|
Xiong Zhaohua
|
Zhaohua Xiong (CCAST & IHEP, Beijing) and Jin Min Yang (ITP, Beijing)
|
B_{s,d}--> mu^+ mu^- in technicolor model with scalars
|
6 Pages, 4 Figures, use ReVtex4, the model description rewritten and
some references added
|
Phys.Lett.B546:221-227,2002
|
10.1016/S0370-2693(02)02710-7
| null |
hep-ph
| null |
Rare decays B_{s,d}-->mu^+ mu^- are evaluated in technicolor model with
scalars. R_b is revisited to constrain the model parameter space. It is found
that restriction on f/f' arising from R_b which was not considered in previous
studies requires f/f' no larger than 1.9 at 95% confidence level, implying no
significantly enhancement for Br(B_{s,d}-->mu^+\mu^-) from neutral scalars in
the model. However, the branching ratio of B_s--> mu^+ mu^- can still be
enhanced by a factor of 5 relative to the standard model prediction. With the
value of f/f' about 1.9, an upgraded Tevatron with an integrated luminosity
20fb^-1 will be sensitive to enhancement of B_s-->mu^+ mu^- in this model
provided that neutral scalar mass m_sigma is below 580 GeV.
|
[
{
"created": "Thu, 15 Aug 2002 02:31:11 GMT",
"version": "v1"
},
{
"created": "Wed, 11 Sep 2002 00:29:56 GMT",
"version": "v2"
}
] |
2011-03-23
|
[
[
"Xiong",
"Zhaohua",
"",
"CCAST & IHEP, Beijing"
],
[
"Yang",
"Jin Min",
"",
"ITP, Beijing"
]
] |
Rare decays B_{s,d}-->mu^+ mu^- are evaluated in technicolor model with scalars. R_b is revisited to constrain the model parameter space. It is found that restriction on f/f' arising from R_b which was not considered in previous studies requires f/f' no larger than 1.9 at 95% confidence level, implying no significantly enhancement for Br(B_{s,d}-->mu^+\mu^-) from neutral scalars in the model. However, the branching ratio of B_s--> mu^+ mu^- can still be enhanced by a factor of 5 relative to the standard model prediction. With the value of f/f' about 1.9, an upgraded Tevatron with an integrated luminosity 20fb^-1 will be sensitive to enhancement of B_s-->mu^+ mu^- in this model provided that neutral scalar mass m_sigma is below 580 GeV.
|
0711.1416
|
Hai-Yang Cheng
|
Hai-Yang Cheng
|
Charmless 3-body B Decays: Resonant and Nonresonant Contributions
|
8 pages, talk presented at 4th International Conference on Flavor
Physics (ICFP 2007), Beijing, China, Sept 24-28, 2007; add references and the
new BaBar measurement of B^0 to K^+ pi^- pi^0
|
Int.J.Mod.Phys.A23:3229-3236,2008
|
10.1142/S0217751X08041888
| null |
hep-ph hep-ex
| null |
Charmless 3-body decays of $B$ mesons are studied using a simple model based
on the framework of the factorization approach. We have identified a large
source of the nonresonant signal in the matrix elements of scalar densities,
e.g. $<K\bar K|\bar ss|0>$. This explains the dominance of the nonresonant
background in $B\to KKK$ decays, the sizable nonresonant fraction of order
$(35\sim 40)%$ in $K^-\pi^+\pi^-$ and $\bar K^0\pi^+\pi^-$ modes and the
smallness of nonresonant rates in $B\to \pi\pi\pi$ decays. We have computed the
resonant and nonresonant contributions to charmless 3-body decays and
determined the rates for the quasi-two-body decays $B\to VP$ and $B\to SP$.
Time-dependent CP asymmetries $\sin2\beta_{\rm eff}$ and $A_{CP}$ in
$K^+K^-K_S,K_SK_SK_S,K_S\pi^+\pi^-$ and $K_S\pi^0\pi^0$ modes are estimated.
|
[
{
"created": "Fri, 9 Nov 2007 08:43:46 GMT",
"version": "v1"
},
{
"created": "Mon, 10 Dec 2007 07:45:38 GMT",
"version": "v2"
}
] |
2008-11-26
|
[
[
"Cheng",
"Hai-Yang",
""
]
] |
Charmless 3-body decays of $B$ mesons are studied using a simple model based on the framework of the factorization approach. We have identified a large source of the nonresonant signal in the matrix elements of scalar densities, e.g. $<K\bar K|\bar ss|0>$. This explains the dominance of the nonresonant background in $B\to KKK$ decays, the sizable nonresonant fraction of order $(35\sim 40)%$ in $K^-\pi^+\pi^-$ and $\bar K^0\pi^+\pi^-$ modes and the smallness of nonresonant rates in $B\to \pi\pi\pi$ decays. We have computed the resonant and nonresonant contributions to charmless 3-body decays and determined the rates for the quasi-two-body decays $B\to VP$ and $B\to SP$. Time-dependent CP asymmetries $\sin2\beta_{\rm eff}$ and $A_{CP}$ in $K^+K^-K_S,K_SK_SK_S,K_S\pi^+\pi^-$ and $K_S\pi^0\pi^0$ modes are estimated.
|
1006.4890
|
Aiichi Iwazaki
|
Aiichi Iwazaki
|
A Quintessence with Tiny Dark Energy Induced by Inflation
|
6 pages, improved English, added references
| null | null |
Nisho-10/1
|
hep-ph astro-ph.CO
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We propose a postulate $\dot{q} =MH$ concerning temporal variation of
quintessence field $q$ where $H$ is Hubble parameter ($=\dot{a}/a$) and $M$ is
the scale characterizing the field. Using the postulate we uniquely determines
a dynamical model of the field. The potential of the field satisfies the
tracking condition. The minimum of the total energy density of matter and the
field is located at $a=\infty$. We show that the present tiny dark energy is
caused by early inflation, while the energy is comparable to Planck scale
before the inflation. Since the model is reduced to $\Lambda$CDM model in the
limit $M\to 0$, it is a natural generalization of $\Lambda$CDM model.
|
[
{
"created": "Fri, 25 Jun 2010 00:27:42 GMT",
"version": "v1"
},
{
"created": "Fri, 3 Sep 2010 02:02:48 GMT",
"version": "v2"
}
] |
2010-09-06
|
[
[
"Iwazaki",
"Aiichi",
""
]
] |
We propose a postulate $\dot{q} =MH$ concerning temporal variation of quintessence field $q$ where $H$ is Hubble parameter ($=\dot{a}/a$) and $M$ is the scale characterizing the field. Using the postulate we uniquely determines a dynamical model of the field. The potential of the field satisfies the tracking condition. The minimum of the total energy density of matter and the field is located at $a=\infty$. We show that the present tiny dark energy is caused by early inflation, while the energy is comparable to Planck scale before the inflation. Since the model is reduced to $\Lambda$CDM model in the limit $M\to 0$, it is a natural generalization of $\Lambda$CDM model.
|
0908.1475
|
Florian Schwennsen
|
Bernard Pire, Florian Schwennsen, Lech Szymanowski, Samuel Wallon
|
Looking for the Odderon in photon collisions
|
talk at Photon 2009: International Conference On The Structure And
Interactions Of The Photon: 18th International Workshop On Photon-Photon
Collisions, 11-15 May 2009, Hamburg, Germany. 5 pages, 3 figures, LaTeX, uses
desyproc.cls (provided); v2: replaced duplicate figures by the intended
different ones
| null | null | null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We discuss the production of two pion pairs in photon collisions at high
energies. We calculate the according matrix elements in k_T-factorization and
discuss the possibility to reveal the existence of the perturbative Odderon by
charge asymmetries.
|
[
{
"created": "Tue, 11 Aug 2009 08:02:32 GMT",
"version": "v1"
},
{
"created": "Wed, 16 Sep 2009 15:24:07 GMT",
"version": "v2"
}
] |
2009-09-16
|
[
[
"Pire",
"Bernard",
""
],
[
"Schwennsen",
"Florian",
""
],
[
"Szymanowski",
"Lech",
""
],
[
"Wallon",
"Samuel",
""
]
] |
We discuss the production of two pion pairs in photon collisions at high energies. We calculate the according matrix elements in k_T-factorization and discuss the possibility to reveal the existence of the perturbative Odderon by charge asymmetries.
|
hep-ph/0003181
|
Zohreh Parsa
|
William J. Marciano (Brookhaven National Laboratory)
|
Precision Electroweak Parameters and the Higgs Mass
|
To be published in the Proceedings of MuMu99-5th International
Conference on Physics Potential and Development of Muon Colliders, San
Francisco, CA, Dec. (1999). 12 pages, Latex
| null |
10.1063/1.1336239
|
BNL-HEP-00/04
|
hep-ph
| null |
The status of various precisely measured electroweak parameters is reviewed.
Natural relations among them are shown to constrain the Higgs mass, m_H, via
quantum loop effects to relatively low values. A comparison with direct Higgs
searches is made.
|
[
{
"created": "Fri, 17 Mar 2000 18:41:19 GMT",
"version": "v1"
}
] |
2009-10-31
|
[
[
"Marciano",
"William J.",
"",
"Brookhaven National Laboratory"
]
] |
The status of various precisely measured electroweak parameters is reviewed. Natural relations among them are shown to constrain the Higgs mass, m_H, via quantum loop effects to relatively low values. A comparison with direct Higgs searches is made.
|
hep-ph/0308136
|
Nasrallah Nasrallah
|
N. Nasrallah (Lebanese Uni.)
|
S-wave pi-pi scattering lengths
|
8 pages
| null | null | null |
hep-ph
| null |
An old calculation of the s-wave pi-pi scattering lengths is updated and
supplemented with experimental data on the pi-pi s-wave phase shift. The
results ma0 = .215 and ma2 = -.039 are in excellent agreement with those
obtained from a recent analysis of the results published by the Brookhaven E865
collaboration.
|
[
{
"created": "Tue, 12 Aug 2003 15:29:31 GMT",
"version": "v1"
}
] |
2007-05-23
|
[
[
"Nasrallah",
"N.",
"",
"Lebanese Uni."
]
] |
An old calculation of the s-wave pi-pi scattering lengths is updated and supplemented with experimental data on the pi-pi s-wave phase shift. The results ma0 = .215 and ma2 = -.039 are in excellent agreement with those obtained from a recent analysis of the results published by the Brookhaven E865 collaboration.
|
1112.1523
|
Palash Baran Pal
|
Sebastian Hollenberg, Octavian Micu, Palash B. Pal
|
Lepton number violating effects in neutrino oscillations
|
11 pages, LaTeX, no figure
| null |
10.1103/PhysRevD.85.053004
|
DO-TH 11/29
|
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We develop a non-adiabatic perturbation theory for oscillations involving an
arbitrary number of neutrino and antineutrino species, including the
possibility of lepton number violation which we treat as a small effect. We
interpret the physics of such an approach for the one generation case by
introducing the notion of adiabaticity for neutrino and antineutrino
oscillations in analogy to flavor oscillations. We find that in a CP-odd matter
environment a small lepton number violation in vacuo can be enhanced.
Eventually, we apply the perturbation theory to the two generation case and
work out an example for manifestations of lepton number violation, which can be
solved both perturbatively as well as analytically thereby further clarifying
the nature of the perturbation expansion.
|
[
{
"created": "Wed, 7 Dec 2011 11:05:38 GMT",
"version": "v1"
}
] |
2013-05-30
|
[
[
"Hollenberg",
"Sebastian",
""
],
[
"Micu",
"Octavian",
""
],
[
"Pal",
"Palash B.",
""
]
] |
We develop a non-adiabatic perturbation theory for oscillations involving an arbitrary number of neutrino and antineutrino species, including the possibility of lepton number violation which we treat as a small effect. We interpret the physics of such an approach for the one generation case by introducing the notion of adiabaticity for neutrino and antineutrino oscillations in analogy to flavor oscillations. We find that in a CP-odd matter environment a small lepton number violation in vacuo can be enhanced. Eventually, we apply the perturbation theory to the two generation case and work out an example for manifestations of lepton number violation, which can be solved both perturbatively as well as analytically thereby further clarifying the nature of the perturbation expansion.
|
1706.07850
|
Martin Erdmann H
|
Martin Erdmann, Christian Glaser, Thorben Quast
|
Acceleration by Strong Interactions
|
6 pages, 7 figures
| null | null | null |
hep-ph hep-ex
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Beyond the attractive strong potential needed for hadronic bound states,
strong interactions are predicted to provide repulsive forces depending on the
color charges involved. The repulsive interactions could in principle serve for
particle acceleration with highest gradients in the order of GeV/fm. Indirect
evidence for repulsive interactions have been reported in the context of heavy
meson production at colliders. In this contribution, we sketch a thought
experiment to directly investigate repulsive strong interactions. For this we
prepare two quarks using two simultaneous deep inelastic scattering processes
off an iron target. We discuss the principle setup of the experiment and
estimate the number of electrons on target required to observe a repulsive
effect between the quarks.
|
[
{
"created": "Sun, 18 Jun 2017 09:21:50 GMT",
"version": "v1"
}
] |
2017-06-27
|
[
[
"Erdmann",
"Martin",
""
],
[
"Glaser",
"Christian",
""
],
[
"Quast",
"Thorben",
""
]
] |
Beyond the attractive strong potential needed for hadronic bound states, strong interactions are predicted to provide repulsive forces depending on the color charges involved. The repulsive interactions could in principle serve for particle acceleration with highest gradients in the order of GeV/fm. Indirect evidence for repulsive interactions have been reported in the context of heavy meson production at colliders. In this contribution, we sketch a thought experiment to directly investigate repulsive strong interactions. For this we prepare two quarks using two simultaneous deep inelastic scattering processes off an iron target. We discuss the principle setup of the experiment and estimate the number of electrons on target required to observe a repulsive effect between the quarks.
|
hep-ph/9904219
|
D. Delepine
|
W. Buchmuller, D. Delepine, F. Vissani
|
Neutrino Mixing and the Pattern of Supersymmetry Breaking
|
12 pages, 2 figures, used axodraw.sty, to be published in Physics
Letters B
|
Phys.Lett.B459:171-178,1999
|
10.1016/S0370-2693(99)00634-6
|
DESY 99-021
|
hep-ph
| null |
We study the implications of a large $\nu_\mu - \nu_\tau$ mixing angle on
lepton flavour violating radiative transitions in supersymmetric extensions of
the standard model. The transition rates are calculated to leading order in
$\epsilon$, the parameter which characterizes the flavour mixing. The
uncertainty of the predicted rates is discussed in detail. For models with
modular invariance the branching ratio $BR(\mu \to e \gamma)$ mostly exceeds
the experimental upper limit. In models with radiatively induced flavour mixing
the predicted range includes the upper limit, if the Yukawa couplings in the
lepton sector are large, as favoured by Yukawa coupling unification.
|
[
{
"created": "Fri, 2 Apr 1999 17:19:47 GMT",
"version": "v1"
},
{
"created": "Thu, 27 May 1999 10:23:58 GMT",
"version": "v2"
}
] |
2014-11-17
|
[
[
"Buchmuller",
"W.",
""
],
[
"Delepine",
"D.",
""
],
[
"Vissani",
"F.",
""
]
] |
We study the implications of a large $\nu_\mu - \nu_\tau$ mixing angle on lepton flavour violating radiative transitions in supersymmetric extensions of the standard model. The transition rates are calculated to leading order in $\epsilon$, the parameter which characterizes the flavour mixing. The uncertainty of the predicted rates is discussed in detail. For models with modular invariance the branching ratio $BR(\mu \to e \gamma)$ mostly exceeds the experimental upper limit. In models with radiatively induced flavour mixing the predicted range includes the upper limit, if the Yukawa couplings in the lepton sector are large, as favoured by Yukawa coupling unification.
|
2008.12305
|
Stefano Forte
|
Stefano Forte and Stefano Carrazza
|
Parton distribution functions
|
45 pages, 18 figures. Submitted for review. Contribution to the
volume "Artificial Intelligence for Particle Physics" (World Scientific
Publishing)
| null | null |
TIF-UNIMI-2020-23
|
hep-ph hep-ex
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We discuss the determination of the parton substructure of hadrons by casting
it as a peculiar form of pattern recognition problem in which the pattern is a
probability distribution, and we present the way this problem has been tackled
and solved. Specifically, we review the NNPDF approach to PDF determination,
which is based on the combination of a Monte Carlo approach with neural
networks as basic underlying interpolators. We discuss the current NNPDF
methodology, based on genetic minimization, and its validation through closure
testing. We then present recent developments in which a hyperoptimized
deep-learning framework for PDF determination is being developed, optimized,
and tested.
|
[
{
"created": "Thu, 27 Aug 2020 18:00:01 GMT",
"version": "v1"
}
] |
2020-08-31
|
[
[
"Forte",
"Stefano",
""
],
[
"Carrazza",
"Stefano",
""
]
] |
We discuss the determination of the parton substructure of hadrons by casting it as a peculiar form of pattern recognition problem in which the pattern is a probability distribution, and we present the way this problem has been tackled and solved. Specifically, we review the NNPDF approach to PDF determination, which is based on the combination of a Monte Carlo approach with neural networks as basic underlying interpolators. We discuss the current NNPDF methodology, based on genetic minimization, and its validation through closure testing. We then present recent developments in which a hyperoptimized deep-learning framework for PDF determination is being developed, optimized, and tested.
|
hep-ph/0301140
|
Mikhail Kirsanov
|
S. N. Gninenko, M. M. Kirsanov, N. V. Krasnikov, V. A. Matveev
|
Prospects of detecting massive isosinglet neutrino at LHC in the CMS
detector
|
14 pages, 13 figures
| null | null | null |
hep-ph
| null |
A possibility to search for a heavy isosinglet (sterile) neutrino using its
decay mode $\nu_s \to l^{\pm} + 2 jets$ in the $S$ - channel production $pp \to
W^* + X \to l^{\pm}\nu_s + X$ in the CMS experiment is studied. The only
assumption about the heavy neutrino is its nonzero mixing with $\nu_e$ or
$\nu_{\mu}$. The corresponding CMS discovery potential expressed in terms of
the heavy neutrino mass and the mixing parameter between the heavy and light
neutrino is determined. It is shown that the heavy neutrino with a mass up to
800 $GeV$ could be detected in CMS. We also investigate the production of the
heavy neutrino $N_l$ mixed with $\nu_e$ and/or $\nu_{\mu}$ in the $SU_C(3)
\otimes SU_L(2) \otimes SU_R(2)\otimes U(1)$ model through the reaction $pp \to
W_R + X \to l^{\pm}N_l + X$ with the same heavy neutrino decay channel as
above. We find that for $M_{W_R} < 3 TeV$ it is possible to discover the heavy
neutrino with a mass up to $0.75 \cdot M_{W_R}$.
|
[
{
"created": "Fri, 17 Jan 2003 18:01:59 GMT",
"version": "v1"
},
{
"created": "Wed, 26 Mar 2003 11:39:24 GMT",
"version": "v2"
},
{
"created": "Sun, 28 Sep 2003 14:36:53 GMT",
"version": "v3"
}
] |
2007-05-23
|
[
[
"Gninenko",
"S. N.",
""
],
[
"Kirsanov",
"M. M.",
""
],
[
"Krasnikov",
"N. V.",
""
],
[
"Matveev",
"V. A.",
""
]
] |
A possibility to search for a heavy isosinglet (sterile) neutrino using its decay mode $\nu_s \to l^{\pm} + 2 jets$ in the $S$ - channel production $pp \to W^* + X \to l^{\pm}\nu_s + X$ in the CMS experiment is studied. The only assumption about the heavy neutrino is its nonzero mixing with $\nu_e$ or $\nu_{\mu}$. The corresponding CMS discovery potential expressed in terms of the heavy neutrino mass and the mixing parameter between the heavy and light neutrino is determined. It is shown that the heavy neutrino with a mass up to 800 $GeV$ could be detected in CMS. We also investigate the production of the heavy neutrino $N_l$ mixed with $\nu_e$ and/or $\nu_{\mu}$ in the $SU_C(3) \otimes SU_L(2) \otimes SU_R(2)\otimes U(1)$ model through the reaction $pp \to W_R + X \to l^{\pm}N_l + X$ with the same heavy neutrino decay channel as above. We find that for $M_{W_R} < 3 TeV$ it is possible to discover the heavy neutrino with a mass up to $0.75 \cdot M_{W_R}$.
|
1211.3701
|
Kevin Dusling
|
Kevin Dusling and Raju Venugopalan
|
Explanation of systematics of CMS p+Pb high multiplicity di-hadron data
at $\sqrt{s}_{\rm NN} = 5.02$ TeV
|
17 pages, 9 figures
| null |
10.1103/PhysRevD.87.054014
| null |
hep-ph hep-ex nucl-ex nucl-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
In a recent article (arXiv:1210.3890), we showed that high multiplicity
di-hadron proton- proton (p+p) data from the CMS experiment are in excellent
agreement with computations in the Color Glass Condensate (CGC) Effective Field
Theory (EFT). This agreement of the theory with several hundred data points
provides a non-trivial description of both nearside ("ridge") and away-side
azimuthal collimations of long range rapidity correlations in p+p collisions.
Our prediction in arXiv:1210.3890 for proton-lead (p+Pb) collisions is
consistent with results from the recent CMS p+Pb run at $\sqrt{s}_{\rm NN} =
5.02$ TeV for the largest track multiplicity $N_{\rm track}\sim 40$ we
considered. The CMS p+Pb data shows the following striking features: i) a
strong dependence of the ridge yield on $N_{\rm track}$, with a significantly
larger signal than in p+p for the same $N_{\rm track}$, ii) a stronger $p_T$
dependence than in p+p for large $N_{\rm track}$, and iii) a nearside
collimation for large $N_{\rm track}$ comparable to the awayside for the lower
$p_T = p_{T}^{\rm trig.}=p_{T}^{\rm assoc.}$ di-hadron windows. We show here
that these systematic features of the CMS p+Pb di-hadron data are all described
by the CGC (with parameters fixed by the p+p data) when we extend our
prediction in arXiv:1210.3890 to rarer high multiplicity events. We also
predict the azimuthally collimated yield for yet unpublished windows in the
$p_{T}^{\rm trig.}$ and $p_{T}^{\rm assoc.}$ matrix.
|
[
{
"created": "Thu, 15 Nov 2012 19:28:34 GMT",
"version": "v1"
}
] |
2013-03-27
|
[
[
"Dusling",
"Kevin",
""
],
[
"Venugopalan",
"Raju",
""
]
] |
In a recent article (arXiv:1210.3890), we showed that high multiplicity di-hadron proton- proton (p+p) data from the CMS experiment are in excellent agreement with computations in the Color Glass Condensate (CGC) Effective Field Theory (EFT). This agreement of the theory with several hundred data points provides a non-trivial description of both nearside ("ridge") and away-side azimuthal collimations of long range rapidity correlations in p+p collisions. Our prediction in arXiv:1210.3890 for proton-lead (p+Pb) collisions is consistent with results from the recent CMS p+Pb run at $\sqrt{s}_{\rm NN} = 5.02$ TeV for the largest track multiplicity $N_{\rm track}\sim 40$ we considered. The CMS p+Pb data shows the following striking features: i) a strong dependence of the ridge yield on $N_{\rm track}$, with a significantly larger signal than in p+p for the same $N_{\rm track}$, ii) a stronger $p_T$ dependence than in p+p for large $N_{\rm track}$, and iii) a nearside collimation for large $N_{\rm track}$ comparable to the awayside for the lower $p_T = p_{T}^{\rm trig.}=p_{T}^{\rm assoc.}$ di-hadron windows. We show here that these systematic features of the CMS p+Pb di-hadron data are all described by the CGC (with parameters fixed by the p+p data) when we extend our prediction in arXiv:1210.3890 to rarer high multiplicity events. We also predict the azimuthally collimated yield for yet unpublished windows in the $p_{T}^{\rm trig.}$ and $p_{T}^{\rm assoc.}$ matrix.
|
1109.0851
|
Mari\'an Koles\'ar
|
Marian Kolesar
|
Analysis of discrepancies in Dalitz plot parameters in eta to 3 pion
decay
|
Presented at "Hadron Structure 2011", Tatranska Strba, Slovakia, June
2011. 4 pages, 1 figure
|
Nucl.Phys.B (Proceedings Supplements) 219-220C (2011) 292-295
|
10.1016/j.nuclphysbps.2011.10.114
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We analyze the Dalitz plot parameters of eta to 3 pion decay in the framework
of resummed chiral perturbation theory. This approach allows us to keep the
uncertainties in the NNLO and higher orders under better control and estimate
their influence. We cannot confirm the suspected discrepancy in the case of the
charged decay parameter b, where even small uncertainties in higher orders
could accommodate the difference. On the other hand, we find the experimental
value of the neutral decay parameter alpha incompatible with an assumption of
good convergence properties in the center of the Dalitz plot. We calculate
pion-pion rescattering bubble corrections up to three loops and show that these
might explain the discrepancy, especially for a low value of the pseudoscalar
decay constant in the chiral limit. However, that could indicate a failure of
convergence of the chiral series in this channel already at low energies around
500MeV.
|
[
{
"created": "Mon, 5 Sep 2011 10:45:57 GMT",
"version": "v1"
},
{
"created": "Tue, 7 Feb 2012 13:40:29 GMT",
"version": "v2"
}
] |
2015-05-30
|
[
[
"Kolesar",
"Marian",
""
]
] |
We analyze the Dalitz plot parameters of eta to 3 pion decay in the framework of resummed chiral perturbation theory. This approach allows us to keep the uncertainties in the NNLO and higher orders under better control and estimate their influence. We cannot confirm the suspected discrepancy in the case of the charged decay parameter b, where even small uncertainties in higher orders could accommodate the difference. On the other hand, we find the experimental value of the neutral decay parameter alpha incompatible with an assumption of good convergence properties in the center of the Dalitz plot. We calculate pion-pion rescattering bubble corrections up to three loops and show that these might explain the discrepancy, especially for a low value of the pseudoscalar decay constant in the chiral limit. However, that could indicate a failure of convergence of the chiral series in this channel already at low energies around 500MeV.
|
hep-ph/0604268
|
Vladislav Pantuev
|
V.S Pantuev
|
Evidence of finite sQGP formation time at RHIC
|
8 pages including 5 figures. Proceedings of the 22nd Winter Workshop
on Nuclear Dynamics, La Jolla, California, March 11-18, 2006
| null | null | null |
hep-ph
| null |
We demonstrate that the existence of a finite formation time of strongly
interacting plasma in nuclear collisions at RHIC is an inavitable conclusion
from recent experimental data. The most striking feature of the experimental
data - an absense of absorption of high transverse momentum pions in the
rection plane direction for mid-peripheral collisions - points to the presence
of a surface zone with no absorption and strong suppression in the inner core.
A natural interpretation of such a zone should be the plasma formation time T=
2-3 fm/c. We discuss constraints induced by finite formation time on some
physical observables at RHIC. Nuclear modification factor, azimuthal assymetry,
di-jet correlations can quantitatively be described by particle production in
the early stage of the nuclear collision. A possible impact on azimuthal
anisotropy at lower hardon momenta, on interpretation of the non-photonic
electrons and J/psi data is also considered.
|
[
{
"created": "Fri, 28 Apr 2006 15:11:23 GMT",
"version": "v1"
}
] |
2007-05-23
|
[
[
"Pantuev",
"V. S",
""
]
] |
We demonstrate that the existence of a finite formation time of strongly interacting plasma in nuclear collisions at RHIC is an inavitable conclusion from recent experimental data. The most striking feature of the experimental data - an absense of absorption of high transverse momentum pions in the rection plane direction for mid-peripheral collisions - points to the presence of a surface zone with no absorption and strong suppression in the inner core. A natural interpretation of such a zone should be the plasma formation time T= 2-3 fm/c. We discuss constraints induced by finite formation time on some physical observables at RHIC. Nuclear modification factor, azimuthal assymetry, di-jet correlations can quantitatively be described by particle production in the early stage of the nuclear collision. A possible impact on azimuthal anisotropy at lower hardon momenta, on interpretation of the non-photonic electrons and J/psi data is also considered.
|
2211.03965
|
Hai-Yang Cheng
|
Hai-Yang Cheng
|
CP violation in the interference between $\rho(770)^0$ and $S$-wave in
$B^\pm\to \pi^+ \pi^-\pi^\pm$ decays and its implication for CP asymmetry in
$B^\pm\to \rho^0\pi^\pm$
|
18 pages, 5 figures, accepted for publication in PRD. arXiv admin
note: text overlap with arXiv:2005.06080, arXiv:2007.02558
| null |
10.1103/PhysRevD.106.113004
| null |
hep-ph hep-ex
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
The decay amplitude analyses of $B^\pm\to \pi^+ \pi^-\pi^\pm$ decays in the
Dalitz plot performed by LHCb indicate that CP asymmetry for the dominant
quasi-two-body decay $B^\pm\to\rho(770)^0\pi^\pm$ was found to be consistent
with zero in all three approaches for the $S$-wave component and that
CP-violation effects related to the interference between the $\rho(770)^0$
resonance and the $S$-wave were clearly observed. We show that the nearly
vanishing CP violation in $B^\pm\to\rho^0\pi^\pm$ is understandable within the
framework of QCD factorization. There are two $1/m_b$ power corrections, one
from penguin annihilation and the other from hard spectator interactions. They
contribute destructively to $A_{CP}(B^\pm\to\rho^0\pi^\pm)$ to render it
compatible with zero, in contrast to the sizable negative CP asymmetry
predicted in most of the existing models. We next show that the measured
interference pattern between the $\rho$ and $S$-wave contributions in the low
$m_{\pi^+\pi^-}$ region separated by the sign of value of $\cos\theta$ with
$\theta$ being the angle between the two same charged pions measured in the
rest frame of the $\rho$ resonance can be explained in terms of the smallness
of $A_{CP}(B^+\to\rho^0\pi^+)$ and the interference between $\rho(770)$ and
$\sigma/f_0(500)$. If CP asymmetry in $B^\pm\to\rho^0\pi^\pm$ is not negligible
as predicted in many existing models, the observed interference pattern will be
destroyed. We conclude that the experimental observation of the interference
pattern between $P$- and $S$-waves in the low-$m_{\pi^+\pi^-}$ region between
0.5 and 1.0 GeV is consistent with a nearly vanishing CP violation in
$B^\pm\to\rho^0\pi^\pm$.
|
[
{
"created": "Tue, 8 Nov 2022 02:47:21 GMT",
"version": "v1"
},
{
"created": "Tue, 29 Nov 2022 02:08:32 GMT",
"version": "v2"
}
] |
2022-12-28
|
[
[
"Cheng",
"Hai-Yang",
""
]
] |
The decay amplitude analyses of $B^\pm\to \pi^+ \pi^-\pi^\pm$ decays in the Dalitz plot performed by LHCb indicate that CP asymmetry for the dominant quasi-two-body decay $B^\pm\to\rho(770)^0\pi^\pm$ was found to be consistent with zero in all three approaches for the $S$-wave component and that CP-violation effects related to the interference between the $\rho(770)^0$ resonance and the $S$-wave were clearly observed. We show that the nearly vanishing CP violation in $B^\pm\to\rho^0\pi^\pm$ is understandable within the framework of QCD factorization. There are two $1/m_b$ power corrections, one from penguin annihilation and the other from hard spectator interactions. They contribute destructively to $A_{CP}(B^\pm\to\rho^0\pi^\pm)$ to render it compatible with zero, in contrast to the sizable negative CP asymmetry predicted in most of the existing models. We next show that the measured interference pattern between the $\rho$ and $S$-wave contributions in the low $m_{\pi^+\pi^-}$ region separated by the sign of value of $\cos\theta$ with $\theta$ being the angle between the two same charged pions measured in the rest frame of the $\rho$ resonance can be explained in terms of the smallness of $A_{CP}(B^+\to\rho^0\pi^+)$ and the interference between $\rho(770)$ and $\sigma/f_0(500)$. If CP asymmetry in $B^\pm\to\rho^0\pi^\pm$ is not negligible as predicted in many existing models, the observed interference pattern will be destroyed. We conclude that the experimental observation of the interference pattern between $P$- and $S$-waves in the low-$m_{\pi^+\pi^-}$ region between 0.5 and 1.0 GeV is consistent with a nearly vanishing CP violation in $B^\pm\to\rho^0\pi^\pm$.
|
1103.1329
|
Kirill Tuchin
|
Kevin Marasinghe, Kirill Tuchin
|
Quarkonium dissociation in quark-gluon plasma via ionization in magnetic
field
|
16 pages, 4 figures; v2: discussion and references added, typos
fixed; v3: discussion section expanded
| null |
10.1103/PhysRevC.84.044908
| null |
hep-ph nucl-ex nucl-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We study the impact of magnetic fields generated in relativistic heavy ion
collisions on the decay probability of quarkonium produced in the central
rapidity region. The quark and anti-quark components are subject to mutually
orthogonal electric and magnetic fields in the quarkonium comoving frame. In
the presence of an electric field, quarkonium has finite dissociation
probability. We use the WKB approximation to derive the dissociation
probability. We found that quarkonium dissociation energy, i.e. the binding
energy at which dissociation probability is of order unity, increases with the
magnetic field strength. It also increases with quarkonium momentum in the
laboratory frame due to Lorentz boost of electric field in the comoving frame.
As a consequence, J/Psi in plasma dissociates at lower temperature then it
would be in the absence of a magnetic field. We argue that J/Psi's produced in
heavy-ion collisions at LHC with P_T>9GeV would dissociate even in vacuum. In
plasma, J/Psi dissociation in magnetic field is much stronger due to decrease
of its binding energy with temperature. We discuss the phenomenological
implications of our results.
|
[
{
"created": "Mon, 7 Mar 2011 18:48:39 GMT",
"version": "v1"
},
{
"created": "Thu, 7 Apr 2011 21:06:47 GMT",
"version": "v2"
},
{
"created": "Wed, 26 Oct 2011 21:41:50 GMT",
"version": "v3"
}
] |
2013-05-29
|
[
[
"Marasinghe",
"Kevin",
""
],
[
"Tuchin",
"Kirill",
""
]
] |
We study the impact of magnetic fields generated in relativistic heavy ion collisions on the decay probability of quarkonium produced in the central rapidity region. The quark and anti-quark components are subject to mutually orthogonal electric and magnetic fields in the quarkonium comoving frame. In the presence of an electric field, quarkonium has finite dissociation probability. We use the WKB approximation to derive the dissociation probability. We found that quarkonium dissociation energy, i.e. the binding energy at which dissociation probability is of order unity, increases with the magnetic field strength. It also increases with quarkonium momentum in the laboratory frame due to Lorentz boost of electric field in the comoving frame. As a consequence, J/Psi in plasma dissociates at lower temperature then it would be in the absence of a magnetic field. We argue that J/Psi's produced in heavy-ion collisions at LHC with P_T>9GeV would dissociate even in vacuum. In plasma, J/Psi dissociation in magnetic field is much stronger due to decrease of its binding energy with temperature. We discuss the phenomenological implications of our results.
|
hep-ph/0508063
|
Hai-Yang Cheng
|
Hai-Yang Cheng
|
Effects of Final-State Interactions in Hadronic B Decays
|
8 pages, plenary talk at International Conference on QCD and Hadronic
Physics, Beijing, China, 16-20 Jun 2005
|
Int.J.Mod.Phys. A21 (2006) 650-657
|
10.1142/S0217751X06031843
| null |
hep-ph
| null |
Final-state rescattering effects on the hadronic B decays and their impact on
direct and mixing-induced CP asymmetries are examined. Implications for some
phenomenologies are briefly discussed.
|
[
{
"created": "Fri, 5 Aug 2005 00:23:42 GMT",
"version": "v1"
},
{
"created": "Mon, 8 Aug 2005 14:55:30 GMT",
"version": "v2"
}
] |
2009-11-11
|
[
[
"Cheng",
"Hai-Yang",
""
]
] |
Final-state rescattering effects on the hadronic B decays and their impact on direct and mixing-induced CP asymmetries are examined. Implications for some phenomenologies are briefly discussed.
|
1603.08745
|
Wolfgang Lucha
|
Wolfgang Lucha, Franz F. Sch\"oberl
|
Instantaneous Bethe-Salpeter Kernel for the Lightest Pseudoscalar Mesons
|
12 pages, 4 figures
|
Phys. Rev. D 93, 096005 (2016)
|
10.1103/PhysRevD.93.096005
|
HEPHY-PUB 964/16
|
hep-ph nucl-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Starting from a phenomenologically successful, numerical solution of the
Dyson-Schwinger equation that governs the quark propagator, we reconstruct in
detail the interaction kernel that has to enter the instantaneous approximation
to the Bethe-Salpeter equation to allow us to describe the lightest
pseudoscalar mesons as quark-antiquark bound states exhibiting the (almost)
masslessness necessary for them to be interpretable as the (pseudo) Goldstone
bosons related to the spontaneous chiral symmetry breaking of quantum
chromodynamics.
|
[
{
"created": "Tue, 29 Mar 2016 12:37:16 GMT",
"version": "v1"
}
] |
2016-05-06
|
[
[
"Lucha",
"Wolfgang",
""
],
[
"Schöberl",
"Franz F.",
""
]
] |
Starting from a phenomenologically successful, numerical solution of the Dyson-Schwinger equation that governs the quark propagator, we reconstruct in detail the interaction kernel that has to enter the instantaneous approximation to the Bethe-Salpeter equation to allow us to describe the lightest pseudoscalar mesons as quark-antiquark bound states exhibiting the (almost) masslessness necessary for them to be interpretable as the (pseudo) Goldstone bosons related to the spontaneous chiral symmetry breaking of quantum chromodynamics.
|
hep-ph/0109268
|
Kaminski
|
R. Kaminski, L. Lesniak and K. Rybicki (Cracow IFJ)
|
A joint analysis of the S-wave in the pi+pi- and pi0pi0 data
|
revised handling of errors, 26 pages, 9 figures
|
Eur.Phys.J.directC4:4,2002
|
10.1103/PhysRevD.65.054014
|
IFJ-1897/PH/2002
|
hep-ph
| null |
We use our former results on pi+pi- S-wave obtained in a nearly
assumption-free way from the 17.2 GeV/c data to predict the pi0pi0 S--wave. The
predictions are compared with the recent results of the E852 experiment at 18.3
GeV/c. A good agreement is found for only one (the "down-flat") solution while
the second one (the "up-flat") is excluded by the pi0pi0 data. Thus the
long-standing "up-down" ambiguity has been finally resolved in favour of the
S-wave intensity which stays large and nearly constant up to the KK-bar
threshold. A joint analysis of both sets of data leads to a reduction of errors
for this solution.
|
[
{
"created": "Thu, 27 Sep 2001 15:20:29 GMT",
"version": "v1"
},
{
"created": "Mon, 25 Mar 2002 13:44:03 GMT",
"version": "v2"
}
] |
2013-05-29
|
[
[
"Kaminski",
"R.",
"",
"Cracow IFJ"
],
[
"Lesniak",
"L.",
"",
"Cracow IFJ"
],
[
"Rybicki",
"K.",
"",
"Cracow IFJ"
]
] |
We use our former results on pi+pi- S-wave obtained in a nearly assumption-free way from the 17.2 GeV/c data to predict the pi0pi0 S--wave. The predictions are compared with the recent results of the E852 experiment at 18.3 GeV/c. A good agreement is found for only one (the "down-flat") solution while the second one (the "up-flat") is excluded by the pi0pi0 data. Thus the long-standing "up-down" ambiguity has been finally resolved in favour of the S-wave intensity which stays large and nearly constant up to the KK-bar threshold. A joint analysis of both sets of data leads to a reduction of errors for this solution.
|
1807.06859
|
Till Martini
|
Till Martini
|
The Matrix Element Method at next-to-leading order QCD using the example
of single top-quark production at the LHC
|
PhD Thesis - Humboldt-University Berlin, February 2018
| null |
10.18452/19288
|
HU-EP-18/23
|
hep-ph hep-ex
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Analyses in high energy physics aim to put the Standard Model---the commonly
accepted theory---to test. For convincing conclusions, analysis methods are
needed which offer an unambiguous comparison between data and theory while
allowing reliable estimates of uncertainties. The Matrix Element Method (MEM)
is a Maximum Likelihood method which is especially tailored for signal searches
and parameter estimation at colliders. The MEM has proven to be beneficial due
to optimal use of the available information and a clean statistical
interpretation of the results. But it has a big drawback: In its original
formulation, the likelihood calculation is intrinsically limited to the leading
perturbative order in the coupling. Higher-order corrections improve the
accuracy of theoretical predictions and allow for unambiguous field-theoretical
interpretation of the extracted information. In this work, the MEM
incorporating corrections of next-to-leading order (NLO) in QCD by defining
event weights suited for the likelihood calculation is presented for the first
time. These weights also enable the generation of unweighted events following
the cross section calculated at NLO accuracy. The method is demonstrated for
top-quark events. The top-quark mass is determined with the MEM at NLO accuracy
from the generated events. The extracted estimators are in agreement with the
input values from the event generation. Repeating the mass determinations from
the same events, without NLO corrections in the predictions, results in biased
estimators. These shifts may not be accounted for by estimated theoretical
uncertainties rendering the estimation of the theoretical uncertainties
unreliable in the leading-order analysis. The results emphasise the importance
of the inclusion of NLO corrections into the MEM.
|
[
{
"created": "Wed, 18 Jul 2018 10:54:13 GMT",
"version": "v1"
}
] |
2018-07-19
|
[
[
"Martini",
"Till",
""
]
] |
Analyses in high energy physics aim to put the Standard Model---the commonly accepted theory---to test. For convincing conclusions, analysis methods are needed which offer an unambiguous comparison between data and theory while allowing reliable estimates of uncertainties. The Matrix Element Method (MEM) is a Maximum Likelihood method which is especially tailored for signal searches and parameter estimation at colliders. The MEM has proven to be beneficial due to optimal use of the available information and a clean statistical interpretation of the results. But it has a big drawback: In its original formulation, the likelihood calculation is intrinsically limited to the leading perturbative order in the coupling. Higher-order corrections improve the accuracy of theoretical predictions and allow for unambiguous field-theoretical interpretation of the extracted information. In this work, the MEM incorporating corrections of next-to-leading order (NLO) in QCD by defining event weights suited for the likelihood calculation is presented for the first time. These weights also enable the generation of unweighted events following the cross section calculated at NLO accuracy. The method is demonstrated for top-quark events. The top-quark mass is determined with the MEM at NLO accuracy from the generated events. The extracted estimators are in agreement with the input values from the event generation. Repeating the mass determinations from the same events, without NLO corrections in the predictions, results in biased estimators. These shifts may not be accounted for by estimated theoretical uncertainties rendering the estimation of the theoretical uncertainties unreliable in the leading-order analysis. The results emphasise the importance of the inclusion of NLO corrections into the MEM.
|
2002.12610
|
Wenchang Xiang
|
Yanbing Cai, Wenchang Xiang, Mengliang Wang, and Daicui Zhou
|
Exclusive photoproduction of vector meson at next-to-leading order from
Color Glass Condensate
|
13 pages, 7 figures and 5 tables
| null |
10.1088/1674-1137/44/7/074110
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
The exclusive photoproduction of vector mesons ($J/\psi$ and $\phi$) are
investigated by taking into account the next-to-leading order corrections in
the framework of Color Glass Condensate. We confront the next-to-leading order
modified dipole amplitude with the HERA data finding good agreement. Our
studies show that the $\chi^2/d.o.f$ from leading order, running coupling and
collinearly improved next-to-leading order dipole amplitudes are 2.159, 1.097,
and 0.932 for the elastic cross section, and 2.056, 1.449, and 1.357 for
differential cross section. The outcomes indicate that the higher-order
corrections have a significant contribution to the vector meson productions and
the description of the experimental data is dramatically improved once the
higher order corrections are included. We extend the next-to-leading order
exclusive vector meson production model to LHC energies by using the same
parameters obtained from HERA. We find that our model can also give a rather
good description of the $J/\psi$ and $\phi$ data in proton-proton collision at
7 TeV and 13 TeV at LHCb experiments.
|
[
{
"created": "Fri, 28 Feb 2020 09:25:15 GMT",
"version": "v1"
}
] |
2020-08-26
|
[
[
"Cai",
"Yanbing",
""
],
[
"Xiang",
"Wenchang",
""
],
[
"Wang",
"Mengliang",
""
],
[
"Zhou",
"Daicui",
""
]
] |
The exclusive photoproduction of vector mesons ($J/\psi$ and $\phi$) are investigated by taking into account the next-to-leading order corrections in the framework of Color Glass Condensate. We confront the next-to-leading order modified dipole amplitude with the HERA data finding good agreement. Our studies show that the $\chi^2/d.o.f$ from leading order, running coupling and collinearly improved next-to-leading order dipole amplitudes are 2.159, 1.097, and 0.932 for the elastic cross section, and 2.056, 1.449, and 1.357 for differential cross section. The outcomes indicate that the higher-order corrections have a significant contribution to the vector meson productions and the description of the experimental data is dramatically improved once the higher order corrections are included. We extend the next-to-leading order exclusive vector meson production model to LHC energies by using the same parameters obtained from HERA. We find that our model can also give a rather good description of the $J/\psi$ and $\phi$ data in proton-proton collision at 7 TeV and 13 TeV at LHCb experiments.
|
hep-ph/0210376
|
Stefan Recksiegel
|
A.G. Akeroyd and S.Recksiegel
|
Large enhancement of D -> e nu and Ds -> e nu in R Parity violating SUSY
models
|
10 pages, 4 figures
|
Phys.Lett. B554 (2003) 38-44
|
10.1016/S0370-2693(02)03293-8
|
KIAS-P02071, KEK-TH-852
|
hep-ph
| null |
The purely leptonic decays D -> e nu and Ds -> e nu, for which no
experimental limits exist, are highly suppressed in the Standard Model. Mere
observation of these decays at the B factories BELLE/BaBar or forthcoming
CLEO-c would be a clear signal of physics beyond the SM. We show that R parity
violating slepton contributions can give rise to spectacular enhancements of
the decay rates, resulting in branching ratios as large as 5 x 10^-3, which
strongly motivates a search in these channels.
|
[
{
"created": "Mon, 28 Oct 2002 13:13:54 GMT",
"version": "v1"
}
] |
2010-04-05
|
[
[
"Akeroyd",
"A. G.",
""
],
[
"Recksiegel",
"S.",
""
]
] |
The purely leptonic decays D -> e nu and Ds -> e nu, for which no experimental limits exist, are highly suppressed in the Standard Model. Mere observation of these decays at the B factories BELLE/BaBar or forthcoming CLEO-c would be a clear signal of physics beyond the SM. We show that R parity violating slepton contributions can give rise to spectacular enhancements of the decay rates, resulting in branching ratios as large as 5 x 10^-3, which strongly motivates a search in these channels.
|
1905.11433
|
Camila Machado
|
Rafael Aoude and Camila S. Machado
|
The Rise of SMEFT On-shell Amplitudes
|
24 pages
| null |
10.1007/JHEP12(2019)058
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We present a map between the tree-level Standard Model Effective Theory
(SMEFT) in the Warsaw basis and massive on-shell amplitudes. As a first step,
we focus on the electroweak sector without fermions. We describe the Feynman
rules for a particular choice of input scheme and compare them with the 3-point
massive amplitudes in the broken phase. Thereby we fix an on-shell basis which
allows us to study scattering amplitudes with recursion relations. We hope to
open up new avenues of exploration to a complete formulation of massive EFTs in
the on-shell language.
|
[
{
"created": "Mon, 27 May 2019 18:11:02 GMT",
"version": "v1"
}
] |
2020-01-29
|
[
[
"Aoude",
"Rafael",
""
],
[
"Machado",
"Camila S.",
""
]
] |
We present a map between the tree-level Standard Model Effective Theory (SMEFT) in the Warsaw basis and massive on-shell amplitudes. As a first step, we focus on the electroweak sector without fermions. We describe the Feynman rules for a particular choice of input scheme and compare them with the 3-point massive amplitudes in the broken phase. Thereby we fix an on-shell basis which allows us to study scattering amplitudes with recursion relations. We hope to open up new avenues of exploration to a complete formulation of massive EFTs in the on-shell language.
|
2212.07736
|
Peter Pl\"o{\ss}l
|
Markus Diehl, Riccardo Nagar, Peter Pl\"o{\ss}l
|
Quark mass effects in double parton distributions
|
v1: 74 pages, 30 figures. v2: 76 pages, 31 figures. Additional
numerical study in section 8.3; clarified some text passages
|
J. High Energ. Phys. 2023, 100 (2023)
|
10.1007/JHEP09(2023)100
|
DESY-22-197
|
hep-ph
|
http://creativecommons.org/licenses/by/4.0/
|
Double parton distributions can be computed from the perturbative splitting
of one parton into two if the distance between the two observed partons is
small. We develop schemes to take into account quark mass effects in this
computation, and we study these schemes numerically at leading order in the
strong coupling. Furthermore, we investigate in detail the structure of the
next-to-leading order corrections to the splitting kernels that include quark
mass effects.
|
[
{
"created": "Thu, 15 Dec 2022 11:35:49 GMT",
"version": "v1"
},
{
"created": "Fri, 22 Sep 2023 11:45:15 GMT",
"version": "v2"
}
] |
2023-09-25
|
[
[
"Diehl",
"Markus",
""
],
[
"Nagar",
"Riccardo",
""
],
[
"Plößl",
"Peter",
""
]
] |
Double parton distributions can be computed from the perturbative splitting of one parton into two if the distance between the two observed partons is small. We develop schemes to take into account quark mass effects in this computation, and we study these schemes numerically at leading order in the strong coupling. Furthermore, we investigate in detail the structure of the next-to-leading order corrections to the splitting kernels that include quark mass effects.
|
0906.2068
|
Giancarlo Ferrera
|
Giancarlo Ferrera (Florence University & INFN, Florence)
|
Higher-order QCD corrections for vector boson production at hadron
colliders
|
4 pages, 5 figures. Proceedings of the XLIVth Rencontres de Moriond
(QCD and High Energy Interactions), La Thuile, Italy, 2009
| null | null | null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We consider higher-order QCD corrections for vector boson production at
hadron colliders. We present recent results on transverse-momentum resummation
for Z production. Moreover we show numerical results from a new fully exclusive
next-to-next-to-leading order (NNLO) calculation.
|
[
{
"created": "Thu, 11 Jun 2009 10:04:57 GMT",
"version": "v1"
}
] |
2009-06-12
|
[
[
"Ferrera",
"Giancarlo",
"",
"Florence University & INFN, Florence"
]
] |
We consider higher-order QCD corrections for vector boson production at hadron colliders. We present recent results on transverse-momentum resummation for Z production. Moreover we show numerical results from a new fully exclusive next-to-next-to-leading order (NNLO) calculation.
|
hep-ph/0102146
|
Jonathan Feng
|
Jonathan L. Feng (MIT), Konstantin T. Matchev (CERN)
|
Supersymmetry and the Anomalous Anomalous Magnetic Moment of the Muon
|
4 pages, 4 figures, version to appear in Phys. Rev. Lett
|
Phys.Rev.Lett.86:3480-3483,2001
|
10.1103/PhysRevLett.86.3480
|
MIT-CTP-3083, CERN-TH/2001-039
|
hep-ph hep-ex hep-th
| null |
The recently reported measurement of the muon's anomalous magnetic moment
differs from the standard model prediction by 2.6 standard deviations. We
examine the implications of this discrepancy for supersymmetry. Deviations of
the reported magnitude are generic in supersymmetric theories. Based on the new
result, we derive model-independent upper bounds on the masses of observable
supersymmetric particles. We also examine several model frameworks. The sign of
the reported deviation is as predicted in many simple models, but disfavors
anomaly-mediated supersymmetry breaking.
|
[
{
"created": "Mon, 12 Feb 2001 23:53:08 GMT",
"version": "v1"
},
{
"created": "Thu, 22 Mar 2001 23:01:07 GMT",
"version": "v2"
}
] |
2009-10-09
|
[
[
"Feng",
"Jonathan L.",
"",
"MIT"
],
[
"Matchev",
"Konstantin T.",
"",
"CERN"
]
] |
The recently reported measurement of the muon's anomalous magnetic moment differs from the standard model prediction by 2.6 standard deviations. We examine the implications of this discrepancy for supersymmetry. Deviations of the reported magnitude are generic in supersymmetric theories. Based on the new result, we derive model-independent upper bounds on the masses of observable supersymmetric particles. We also examine several model frameworks. The sign of the reported deviation is as predicted in many simple models, but disfavors anomaly-mediated supersymmetry breaking.
|
1902.00517
|
Gabriela Barenboim
|
Gabriela Barenboim, Peter B. Denton, Stephen J. Parke and Christoph A.
Ternes
|
Neutrino oscillation probabilities through the looking glass
|
32 pages, 6 figures
|
Phys.Lett. B791 (2019) 351-360
|
10.1016/j.physletb.2019.03.002
|
{IFIC/19-07; FERMILAB-PUB-19-009-T
|
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
In this paper we review different expansions for neutrino oscillation
probabilities in matter in the context of long-baseline neutrino experiments.
We examine the accuracy and computational efficiency of different exact and
approximate expressions. We find that many of the expressions used in the
literature are not precise enough for the next generation of long-baseline
experiments, but several of them are while maintaining comparable simplicity.
The results of this paper can be used as guidance to both phenomenologists and
experimentalists when implementing the various oscillation expressions into
their analysis tools.
|
[
{
"created": "Fri, 1 Feb 2019 19:00:05 GMT",
"version": "v1"
}
] |
2019-03-14
|
[
[
"Barenboim",
"Gabriela",
""
],
[
"Denton",
"Peter B.",
""
],
[
"Parke",
"Stephen J.",
""
],
[
"Ternes",
"Christoph A.",
""
]
] |
In this paper we review different expansions for neutrino oscillation probabilities in matter in the context of long-baseline neutrino experiments. We examine the accuracy and computational efficiency of different exact and approximate expressions. We find that many of the expressions used in the literature are not precise enough for the next generation of long-baseline experiments, but several of them are while maintaining comparable simplicity. The results of this paper can be used as guidance to both phenomenologists and experimentalists when implementing the various oscillation expressions into their analysis tools.
|
hep-ph/0307360
|
Midori Obara
|
Masako Bando and Midori Obara
|
Neutrino Bi-Large Mixings and Family
|
6 pages, latex, uses ws-procs9x6.cls. Talk presented by Bando at 4th
Workshop on Neutrino Oscillations and their Origin (NOON2003), Kanazawa,
Japan, 10-14 Feb 2003. To appear in the proceedings
| null |
10.1142/9789812703101_0050
|
OCHA-PP-208
|
hep-ph
| null |
After a brief review of quark-lepton relations in grand unified theories
(GUT), we show that the Pati-Salam relation with only one type of Higgs field
configuration with "four zero symmetric texture" can reproduce two large
neutrino mixings as well as observed mass differences. This is quite in
contrast to the case of SU(5) where bi-large mixings essentially come from the
charged lepton sector with non-symmetric charged lepton mass matrix.
|
[
{
"created": "Wed, 30 Jul 2003 03:17:37 GMT",
"version": "v1"
}
] |
2017-08-23
|
[
[
"Bando",
"Masako",
""
],
[
"Obara",
"Midori",
""
]
] |
After a brief review of quark-lepton relations in grand unified theories (GUT), we show that the Pati-Salam relation with only one type of Higgs field configuration with "four zero symmetric texture" can reproduce two large neutrino mixings as well as observed mass differences. This is quite in contrast to the case of SU(5) where bi-large mixings essentially come from the charged lepton sector with non-symmetric charged lepton mass matrix.
|
1811.00930
|
Kyrylo Bondarenko
|
SHiP Collaboration
|
Sensitivity of the SHiP experiment to Heavy Neutral Leptons
|
journal version
| null | null | null |
hep-ph hep-ex
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Heavy Neutral Leptons (HNLs) are hypothetical particles predicted by many
extensions of the Standard Model. These particles can, among other things,
explain the origin of neutrino masses, generate the observed matter-antimatter
asymmetry in the Universe and provide a dark matter candidate.
The SHiP experiment will be able to search for HNLs produced in decays of
heavy mesons and travelling distances ranging between $\mathcal{O}(50\text{
m})$ and tens of kilometers before decaying. We present the sensitivity of the
SHiP experiment to a number of HNL's benchmark models and provide a way to
calculate the SHiP's sensitivity to HNLs for arbitrary patterns of flavour
mixings. The corresponding tools and data files are also made publicly
available.
|
[
{
"created": "Fri, 2 Nov 2018 15:21:58 GMT",
"version": "v1"
},
{
"created": "Mon, 19 Nov 2018 17:41:08 GMT",
"version": "v2"
},
{
"created": "Fri, 5 Apr 2019 17:50:11 GMT",
"version": "v3"
}
] |
2019-04-08
|
[
[
"SHiP Collaboration",
"",
""
]
] |
Heavy Neutral Leptons (HNLs) are hypothetical particles predicted by many extensions of the Standard Model. These particles can, among other things, explain the origin of neutrino masses, generate the observed matter-antimatter asymmetry in the Universe and provide a dark matter candidate. The SHiP experiment will be able to search for HNLs produced in decays of heavy mesons and travelling distances ranging between $\mathcal{O}(50\text{ m})$ and tens of kilometers before decaying. We present the sensitivity of the SHiP experiment to a number of HNL's benchmark models and provide a way to calculate the SHiP's sensitivity to HNLs for arbitrary patterns of flavour mixings. The corresponding tools and data files are also made publicly available.
|
1007.4765
|
G. Valencia
|
German Valencia
|
CP violation in top-quark physics
|
Prepared for TOP2010 workshop, 8 pages
| null |
10.1393/ncc/i2010-10673-2
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
In this talk I review how to search for CP violation in top-quark pair
production and decay using T-odd correlations. I discuss two examples which
illustrate many of the relevant features: CP violation in a heavy neutral Higgs
boson; and CP violating anomalous top-quark couplings. I present some numerical
results for the LHC and some for the Tevatron.
|
[
{
"created": "Tue, 27 Jul 2010 16:12:38 GMT",
"version": "v1"
}
] |
2022-03-02
|
[
[
"Valencia",
"German",
""
]
] |
In this talk I review how to search for CP violation in top-quark pair production and decay using T-odd correlations. I discuss two examples which illustrate many of the relevant features: CP violation in a heavy neutral Higgs boson; and CP violating anomalous top-quark couplings. I present some numerical results for the LHC and some for the Tevatron.
|
2208.00080
|
Pietro Santorelli
|
Massimo Ladisa, Pietro Santorelli
|
The role of long distance contribution to the $B\to K^{(\ast)} \ell^+
\ell^-$ in the Standard Model
|
12 pages, 7 figures, 1 table
| null |
10.1016/j.physletb.2023.137877
| null |
hep-ph hep-ex
|
http://creativecommons.org/licenses/by/4.0/
|
We investigate rare semileptonic $B \to K^\ast\ell^+\ell^-$ by looking at the
long distance contributions. Our analysis is limited to the very small values
of physical accessible range of invariant mass of the leptonic couple $q^2$. We
show that the light quarks loop has to be accounted for, along with the
charming penguin contribution, in order to accurately compute the
$q^2$-spectrum in the Standard Model. Such a long distance contribution may
also play a role in the analysis of the lepton flavour universality violation
in this process.
|
[
{
"created": "Fri, 29 Jul 2022 21:29:05 GMT",
"version": "v1"
}
] |
2023-04-26
|
[
[
"Ladisa",
"Massimo",
""
],
[
"Santorelli",
"Pietro",
""
]
] |
We investigate rare semileptonic $B \to K^\ast\ell^+\ell^-$ by looking at the long distance contributions. Our analysis is limited to the very small values of physical accessible range of invariant mass of the leptonic couple $q^2$. We show that the light quarks loop has to be accounted for, along with the charming penguin contribution, in order to accurately compute the $q^2$-spectrum in the Standard Model. Such a long distance contribution may also play a role in the analysis of the lepton flavour universality violation in this process.
|
hep-ph/9604428
|
Abel Steven
|
S.A.Abel
|
In Search of the Next Next-to-MSSM
|
7 pages, no figures, plain LaTeX; Talk presented at XXXIst Rencontres
de Moriond, March 1996
| null | null | null |
hep-ph
| null |
It is argued that the Next-to-MSSM (NMSSM) is unnatural from the point of
view of cosmology and fine tuning. In particular, such singlet extensions to
the MSSM do not provide a simple solution to the `$\mu$-problem'. Models with
singlets can be constructed using gauged-$R$ symmetry or target space duality.
However their superpotentials have terms in addition to those of the NMSSM.
|
[
{
"created": "Mon, 29 Apr 1996 15:29:22 GMT",
"version": "v1"
}
] |
2007-05-23
|
[
[
"Abel",
"S. A.",
""
]
] |
It is argued that the Next-to-MSSM (NMSSM) is unnatural from the point of view of cosmology and fine tuning. In particular, such singlet extensions to the MSSM do not provide a simple solution to the `$\mu$-problem'. Models with singlets can be constructed using gauged-$R$ symmetry or target space duality. However their superpotentials have terms in addition to those of the NMSSM.
|
2006.08800
|
David De La Cruz G\'omez
|
Alejandro Ayala, David de la Cruz, L. A. Hern\'andez, S.
Hern\'andez-Ort\'iz and Jordi Salinas
|
Quark spin - thermal vorticity alignment and the Lambda, anti-Lambda
polarization in heavy-ion collisions
|
9 pages, 5 figures. Proceedings of the 36th Winter Workshop on
Nuclear Dynamics, Puerto Vallarta, Mexico 2020
| null |
10.1088/1742-6596/1602/1/012025
| null |
hep-ph nucl-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
It has been proposed that the $\Lambda$ and $\overline{\Lambda}$
polarizations observed in heavy-ion collisions are due to the interaction
between quark spin and thermal vorticity. In this work we report on a
computation of the relaxation time required for this alignment to occur at
finite temperature and baryon chemical potential, considering quarks with a
finite mass. The calculation is performed after modelling the interaction by
means of an effective vertex which couples the thermal gluons and quarks within
the vortical medium. We show that the effect of the quark mass is to reduce the
relaxation time as compared to the massless quark case. An intrinsic global
polarization of quarks/antiquarks emerges which is shown to be linked with the
$\Lambda$/$\bar{\Lambda}$ polarization.
|
[
{
"created": "Mon, 15 Jun 2020 22:17:26 GMT",
"version": "v1"
}
] |
2020-09-23
|
[
[
"Ayala",
"Alejandro",
""
],
[
"de la Cruz",
"David",
""
],
[
"Hernández",
"L. A.",
""
],
[
"Hernández-Ortíz",
"S.",
""
],
[
"Salinas",
"Jordi",
""
]
] |
It has been proposed that the $\Lambda$ and $\overline{\Lambda}$ polarizations observed in heavy-ion collisions are due to the interaction between quark spin and thermal vorticity. In this work we report on a computation of the relaxation time required for this alignment to occur at finite temperature and baryon chemical potential, considering quarks with a finite mass. The calculation is performed after modelling the interaction by means of an effective vertex which couples the thermal gluons and quarks within the vortical medium. We show that the effect of the quark mass is to reduce the relaxation time as compared to the massless quark case. An intrinsic global polarization of quarks/antiquarks emerges which is shown to be linked with the $\Lambda$/$\bar{\Lambda}$ polarization.
|
0711.1616
|
Aida El-Khadra
|
A. X. El-Khadra
|
Weak Charm Decays with Lattice QCD
|
8 pages, 7 figures, to be published in the proceedings of CHARM07,
Ithaca, NY, August 2007, eConf C070805
|
ECONF C070805:31,2007
| null | null |
hep-ph
| null |
In this paper I review the status of lattice QCD calculations of $D$ and
$D_s$ meson decay constants and of $D$ meson semileptonic decay form factors. I
restrict my discussion to results obtained from simulations with $n_f = 2+1$
sea quarks.
|
[
{
"created": "Mon, 12 Nov 2007 15:56:12 GMT",
"version": "v1"
}
] |
2010-11-19
|
[
[
"El-Khadra",
"A. X.",
""
]
] |
In this paper I review the status of lattice QCD calculations of $D$ and $D_s$ meson decay constants and of $D$ meson semileptonic decay form factors. I restrict my discussion to results obtained from simulations with $n_f = 2+1$ sea quarks.
|
1412.7406
|
George Rupp
|
Marco Cardoso, George Rupp, and Eef van Beveren
|
$X(3872)$ electromagnetic decay in a coupled-channel model
|
6 pages, 2 figures (3 plots), 3 tables, appolb style, Talk given by
M. Cardoso at the "EEF70" Workshop on Unquenched Hadron Spectroscopy:
Non-Perturbative Models and Methods of QCD, Coimbra, 1-5 Sept. 2014,
Conference no. C14-09-01.4
| null | null | null |
hep-ph hep-ex
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
A multichannel Schr\"odinger equation with both quark-antiquark and
meson-meson components, using a harmonic-oscillator potential for $q\bar{q}$
confinement and a delta-shell string-breaking potential for decay, is applied
to the axial-vecor $X(3872)$ and lowest vector charmonia. The model parameters
are fitted to the experimental values of the masses of the $X(3872)$, $J/\psi$
and $\psi(2S)$. The wave functions of these states are computed and then used
to calculate the electromagnetic decay widths of the $X(3872)$ into
$J/\psi\gamma$ and $\psi(2S)\gamma$.
|
[
{
"created": "Tue, 23 Dec 2014 15:37:01 GMT",
"version": "v1"
}
] |
2015-01-28
|
[
[
"Cardoso",
"Marco",
""
],
[
"Rupp",
"George",
""
],
[
"van Beveren",
"Eef",
""
]
] |
A multichannel Schr\"odinger equation with both quark-antiquark and meson-meson components, using a harmonic-oscillator potential for $q\bar{q}$ confinement and a delta-shell string-breaking potential for decay, is applied to the axial-vecor $X(3872)$ and lowest vector charmonia. The model parameters are fitted to the experimental values of the masses of the $X(3872)$, $J/\psi$ and $\psi(2S)$. The wave functions of these states are computed and then used to calculate the electromagnetic decay widths of the $X(3872)$ into $J/\psi\gamma$ and $\psi(2S)\gamma$.
|
1909.11108
|
Marcel Golz
|
Rigo Bause, Marcel Golz, Gudrun Hiller, Andrey Tayduganov
|
The New Physics Reach of Null Tests with $D \to \pi \ell \ell$ and $D_s
\to K \ell \ell $ Decays
|
v3: 35 pages, 12 figures; Terms involving finite m_l and C_T
corrected in Eqs. (7), (17), (18), (21); q^2 integration limits in Eq.(9)
adapted to LHCb analysis; benchmarks for D->pi mumu in Table II corrected;
bounds on WCs in Eq. (10) and (25) corrected; further numerics and
conclusions unchanged
|
Eur. Phys. J. C 80, 65 (2020)
|
10.1140/epjc/s10052-020-7621-7
|
DO-TH 19/11, QFET 2019-11
|
hep-ph hep-ex
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
$|\Delta c|=|\Delta u|=1$ processes are unique probes of flavor physics in
the up-sector within and beyond the Standard Model (SM). SM tests with rare
semileptonic charm meson decays are based on an approximate CP--symmetry, a
superior GIM--mechanism, angular distributions, lepton-universality and lepton
flavor conservation. We analyze the complete set of null test observables in $D
\to \pi \ell \ell^{(\prime)}$ and $D_s \to K \ell \ell^{(\prime)}$ decays,
$\ell^{(\prime)}=e, \mu$, and find large room for new physics safely above the
SM contribution. We identify signatures of supersymmetry, leptoquarks and
anomaly-free $U(1)^\prime$-models with generation-dependent charges, for which
we provide explicit examples. $Z^\prime$-effects in $c \to u \ell
\ell^{(\prime)}$ transitions can be sizable if both left-handed and
right-handed couplings to quarks are present.
|
[
{
"created": "Tue, 24 Sep 2019 18:04:52 GMT",
"version": "v1"
},
{
"created": "Fri, 31 Jan 2020 06:47:22 GMT",
"version": "v2"
},
{
"created": "Mon, 1 Feb 2021 16:49:50 GMT",
"version": "v3"
}
] |
2021-02-02
|
[
[
"Bause",
"Rigo",
""
],
[
"Golz",
"Marcel",
""
],
[
"Hiller",
"Gudrun",
""
],
[
"Tayduganov",
"Andrey",
""
]
] |
$|\Delta c|=|\Delta u|=1$ processes are unique probes of flavor physics in the up-sector within and beyond the Standard Model (SM). SM tests with rare semileptonic charm meson decays are based on an approximate CP--symmetry, a superior GIM--mechanism, angular distributions, lepton-universality and lepton flavor conservation. We analyze the complete set of null test observables in $D \to \pi \ell \ell^{(\prime)}$ and $D_s \to K \ell \ell^{(\prime)}$ decays, $\ell^{(\prime)}=e, \mu$, and find large room for new physics safely above the SM contribution. We identify signatures of supersymmetry, leptoquarks and anomaly-free $U(1)^\prime$-models with generation-dependent charges, for which we provide explicit examples. $Z^\prime$-effects in $c \to u \ell \ell^{(\prime)}$ transitions can be sizable if both left-handed and right-handed couplings to quarks are present.
|
1008.2171
|
Mikhail Voloshin
|
M.B. Voloshin
|
Neutrino scattering on atomic electrons in searches for neutrino
magnetic moment
|
7 pages. A clarifying illustrative example added
|
Phys.Rev.Lett.105:201801,2010
|
10.1103/PhysRevLett.105.201801
|
FTPI-MINN-10/20, UMN-TH-2912/10
|
hep-ph hep-ex
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
The scattering of a neutrino on atomic electrons is considered in the
situation where the energy transferred to the electrons is comparable to the
characteristic atomic energies, as relevant to the current experimental search
for neutrino magnetic moment. The process is contributed by the standard
electroweak interaction as well as by the possible neutrino magnetic moment.
Quantum mechanical sum rules are derived for the inclusive cross section at a
fixed energy deposited in the atomic system, and it is shown that the
differential over the energy transfer cross section is given, modulo very small
corrections, by the same expression as for free electrons, once all possible
final states of the electronic system are taken into account. Thus the atomic
effects effectively cancel in the inclusive process.
|
[
{
"created": "Thu, 12 Aug 2010 17:36:57 GMT",
"version": "v1"
},
{
"created": "Fri, 20 Aug 2010 17:11:27 GMT",
"version": "v2"
},
{
"created": "Mon, 23 Aug 2010 17:18:53 GMT",
"version": "v3"
}
] |
2010-11-11
|
[
[
"Voloshin",
"M. B.",
""
]
] |
The scattering of a neutrino on atomic electrons is considered in the situation where the energy transferred to the electrons is comparable to the characteristic atomic energies, as relevant to the current experimental search for neutrino magnetic moment. The process is contributed by the standard electroweak interaction as well as by the possible neutrino magnetic moment. Quantum mechanical sum rules are derived for the inclusive cross section at a fixed energy deposited in the atomic system, and it is shown that the differential over the energy transfer cross section is given, modulo very small corrections, by the same expression as for free electrons, once all possible final states of the electronic system are taken into account. Thus the atomic effects effectively cancel in the inclusive process.
|
hep-ph/0008311
|
Lorenzo Magnea
|
Lorenzo Magnea
|
The resummed quark form factor in dimensional regularization
|
5 pages, LaTeX with espcrc2.sty, talk given at QCD 00, Montpellier
(France), 6-13/7/2000
|
Nucl.Phys.Proc.Suppl. 96 (2001) 84-88
|
10.1016/S0920-5632(01)01113-6
| null |
hep-ph
| null |
The resummed expression for the quark form factor illustrates the fact that
dimensional continuation provides a regularization not only for ultraviolet and
infrared singularities of fixed order QCD amplitudes, but also for the Landau
pole arising in resummed calculations. Explicit renormalization group invariant
analytic expressions for the logarithm of the form factor are given up to
two-loop order in the QCD beta function.
|
[
{
"created": "Wed, 30 Aug 2000 13:17:04 GMT",
"version": "v1"
}
] |
2009-10-31
|
[
[
"Magnea",
"Lorenzo",
""
]
] |
The resummed expression for the quark form factor illustrates the fact that dimensional continuation provides a regularization not only for ultraviolet and infrared singularities of fixed order QCD amplitudes, but also for the Landau pole arising in resummed calculations. Explicit renormalization group invariant analytic expressions for the logarithm of the form factor are given up to two-loop order in the QCD beta function.
|
0706.0293
|
Jihn E. Kim
|
Jihn E. Kim
|
Gauge mediated supersymmetry breaking without exotics in orbifold
compactification
|
16 pages with 3 figures
|
Phys.Lett.B651:407-413,2007
|
10.1016/j.physletb.2007.06.048
|
SNUTP 07-007
|
hep-ph hep-th
| null |
We suggest SU(5)$'$ in the hidden sector toward a possible gauge mediated
supersymmetry breaking scenario for removing the SUSY flavor problem, with an
example constructed in $\Z_{12-I}$ with three families. The example we present
has the Pati-Salam type classification of particles in the observable sector
and has no exotics at low energy. We point out that six or seven very light
pairs of ${\bf 5}'$ and $\bar{\bf 5}'$ out of ten vectorlike $\five'$ and
$\fiveb'$ pairs of SU(5)$'$ is achievable, leading to a possibility of an
unstable supersymmetry breaking vacuum. The possibility of different
compactification radii of three two tori toward achieving the needed coupling
strength is also suggested.
|
[
{
"created": "Mon, 4 Jun 2007 04:23:02 GMT",
"version": "v1"
},
{
"created": "Mon, 18 Jun 2007 08:32:29 GMT",
"version": "v2"
}
] |
2008-11-26
|
[
[
"Kim",
"Jihn E.",
""
]
] |
We suggest SU(5)$'$ in the hidden sector toward a possible gauge mediated supersymmetry breaking scenario for removing the SUSY flavor problem, with an example constructed in $\Z_{12-I}$ with three families. The example we present has the Pati-Salam type classification of particles in the observable sector and has no exotics at low energy. We point out that six or seven very light pairs of ${\bf 5}'$ and $\bar{\bf 5}'$ out of ten vectorlike $\five'$ and $\fiveb'$ pairs of SU(5)$'$ is achievable, leading to a possibility of an unstable supersymmetry breaking vacuum. The possibility of different compactification radii of three two tori toward achieving the needed coupling strength is also suggested.
|
0810.1152
|
Adrian Signer
|
Adrian Signer
|
The charm quark mass from non-relativistic sum rules
|
15 pages, 2 figures
|
Phys.Lett.B672:333-338,2009
|
10.1016/j.physletb.2009.01.028
|
IPPP/08/74
|
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We present an analysis to determine the charm quark mass from
non-relativistic sum rules, using a combined approach taking into account
fixed-order and effective-theory calculations. Non-perturbative corrections as
well as higher-order perturbative corrections are under control. For the PS
mass we find m_{PS}(0.7 GeV) = 1.50\pm 0.04 GeV, which translates into a MS-bar
mass of m = 1.25\pm 0.04 GeV.
|
[
{
"created": "Tue, 7 Oct 2008 10:41:16 GMT",
"version": "v1"
}
] |
2014-11-18
|
[
[
"Signer",
"Adrian",
""
]
] |
We present an analysis to determine the charm quark mass from non-relativistic sum rules, using a combined approach taking into account fixed-order and effective-theory calculations. Non-perturbative corrections as well as higher-order perturbative corrections are under control. For the PS mass we find m_{PS}(0.7 GeV) = 1.50\pm 0.04 GeV, which translates into a MS-bar mass of m = 1.25\pm 0.04 GeV.
|
1503.02135
|
Ipsita Saha
|
Dipankar Das, Ipsita Saha
|
Search for a 'stable alignment limit' in two Higgs-doublet models
|
References added, some comments added, matches with published PRD
version
|
Phys. Rev. D 91, 095024 (2015)
|
10.1103/PhysRevD.91.095024
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We study the conditions required to make the 2HDM scalar potential stable up
to the Planck scale. The lightest CP-even scalar is assumed to have been found
at the LHC and the {\em alignment limit} is imposed in view of the LHC Higgs
data. We find that ensuring stability up to scales $\gtrsim 10^{10}$~GeV
necessitates the introduction of a soft breaking parameter in the theory. Even
then, some interesting correlations between the nonstandard masses and the soft
breaking parameter need to be satisfied. Consequently, a 2HDM becomes
completely determined by only two nonstandard parameters, namely, $\tb$ and a
mass parameter, $m_0$, with $\tb \gtrsim 3$. These observations make a 2HDM, in
the {\em stable alignment limit}, more predictive than ever.
|
[
{
"created": "Sat, 7 Mar 2015 06:56:46 GMT",
"version": "v1"
},
{
"created": "Tue, 30 Jun 2015 14:53:55 GMT",
"version": "v2"
}
] |
2015-07-01
|
[
[
"Das",
"Dipankar",
""
],
[
"Saha",
"Ipsita",
""
]
] |
We study the conditions required to make the 2HDM scalar potential stable up to the Planck scale. The lightest CP-even scalar is assumed to have been found at the LHC and the {\em alignment limit} is imposed in view of the LHC Higgs data. We find that ensuring stability up to scales $\gtrsim 10^{10}$~GeV necessitates the introduction of a soft breaking parameter in the theory. Even then, some interesting correlations between the nonstandard masses and the soft breaking parameter need to be satisfied. Consequently, a 2HDM becomes completely determined by only two nonstandard parameters, namely, $\tb$ and a mass parameter, $m_0$, with $\tb \gtrsim 3$. These observations make a 2HDM, in the {\em stable alignment limit}, more predictive than ever.
|
1911.11677
|
Benjamin Fuks
|
Benjamin Fuks, Federica Giacchino, Laura Lopez-Honorez, Michel H.G.
Tytgat and J\'er\^ome Vandecasteele
|
Strong dynamics and dark matter: investigating a minimal setup
|
6 pages, 4 figures, presented at LFC19 (Strong dynamics for physics
within and beyond the Standard Model at LHC and Future Colliders)
| null | null |
ULB-TH/19-09
|
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We discuss the phenomenology of a dark matter scenario in which we extend the
Standard Model by a real scalar particle and a vector-like heavy quark. Such a
model can be seen as a simplified version of a composite setup in which the
scalar field, that couples to the top quark via a Yukawa interaction with the
new heavy quark, is a viable dark matter candidate. We emphasize that QCD
corrections are important not only for predictions at colliders but also for
direct and indirect dark matter searches and the relic abundance. We moreover
show that a large fraction of the model parameter space remains unconstrained.
|
[
{
"created": "Tue, 26 Nov 2019 16:22:59 GMT",
"version": "v1"
}
] |
2019-11-27
|
[
[
"Fuks",
"Benjamin",
""
],
[
"Giacchino",
"Federica",
""
],
[
"Lopez-Honorez",
"Laura",
""
],
[
"Tytgat",
"Michel H. G.",
""
],
[
"Vandecasteele",
"Jérôme",
""
]
] |
We discuss the phenomenology of a dark matter scenario in which we extend the Standard Model by a real scalar particle and a vector-like heavy quark. Such a model can be seen as a simplified version of a composite setup in which the scalar field, that couples to the top quark via a Yukawa interaction with the new heavy quark, is a viable dark matter candidate. We emphasize that QCD corrections are important not only for predictions at colliders but also for direct and indirect dark matter searches and the relic abundance. We moreover show that a large fraction of the model parameter space remains unconstrained.
|
hep-ph/0108181
|
William J. Marciano
|
William J. Marciano
|
Extra Long Baseline Neutrino Oscillations and CP Violation
|
11 pages
| null | null |
bnl-het-01/31
|
hep-ph
| null |
The potential for studying CP violation in neutrino oscillations using
conventional neutrino and anti-neutrino beams is examined.
|
[
{
"created": "Wed, 22 Aug 2001 18:51:52 GMT",
"version": "v1"
}
] |
2007-05-23
|
[
[
"Marciano",
"William J.",
""
]
] |
The potential for studying CP violation in neutrino oscillations using conventional neutrino and anti-neutrino beams is examined.
|
1106.4379
|
Shuji Sasagawa
|
S. Sasagawa, H. Tanaka
|
The effect of an imaginary part of the Schwinger-Dyson equation at
finite temperature and density
|
12 pages, 14 figures
| null |
10.1103/PhysRevC.85.045201
|
RUP-11-6
|
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We examined the effect of an imaginary part of the ladder approximation
Schwinger-Dyson equation. We show the imaginary part enhances the effect of the
first order transition, and affects a tricritical point. In particular, a
chemical potential at a tricritical point is moved about 200(MeV). Thus, one
should not ignore the imaginary part. On the other hand, since an imaginary
part is small away from a tricritical point, one should be able to ignore an
imaginary part. In addition, we also examined the contribution of the wave
function renormalization constant.
|
[
{
"created": "Wed, 22 Jun 2011 06:24:05 GMT",
"version": "v1"
},
{
"created": "Thu, 15 Dec 2011 06:07:22 GMT",
"version": "v2"
}
] |
2013-05-30
|
[
[
"Sasagawa",
"S.",
""
],
[
"Tanaka",
"H.",
""
]
] |
We examined the effect of an imaginary part of the ladder approximation Schwinger-Dyson equation. We show the imaginary part enhances the effect of the first order transition, and affects a tricritical point. In particular, a chemical potential at a tricritical point is moved about 200(MeV). Thus, one should not ignore the imaginary part. On the other hand, since an imaginary part is small away from a tricritical point, one should be able to ignore an imaginary part. In addition, we also examined the contribution of the wave function renormalization constant.
|
hep-ph/9809454
|
E. Predazzi- .:Off. +39-11 6707221, Home
|
E. Predazzi
|
Diffraction : past, present and future
|
Lectures given at Hadrons VI (Florianopolis, Brazil) - 75 pages Latex
- 32 Figures upon request at predazzi@to.infn.it
| null | null |
DFTT 57/98
|
hep-ph
| null |
Hadronic diffraction has become a hot and fashionable subject in recent years
due to the great interest triggered by the HERA and Tevatron data. These data
have helped to put the field in a different perspective paving the road to a
hopefully more complete understanding than hitherto achieved. The forthcoming
data in the next few years from even higher energies (LHC) promise to sustain
this interest for a long time. It is, therefore, necessary to provide the
younger generations with as complete as possible discussion of the main
developments that have marked the growth of high energy diffractive physics in
the past and to assess the present state of the art. For this reason, this part
will be by far the largest. The analysis of the relationship between
conventional diffractive physics and the low-x physics from deep inelastic
scattering will allow us also to review the instruments which could help to
understand the developments we can expect from the future.
|
[
{
"created": "Fri, 18 Sep 1998 18:32:00 GMT",
"version": "v1"
}
] |
2009-09-25
|
[
[
"Predazzi",
"E.",
""
]
] |
Hadronic diffraction has become a hot and fashionable subject in recent years due to the great interest triggered by the HERA and Tevatron data. These data have helped to put the field in a different perspective paving the road to a hopefully more complete understanding than hitherto achieved. The forthcoming data in the next few years from even higher energies (LHC) promise to sustain this interest for a long time. It is, therefore, necessary to provide the younger generations with as complete as possible discussion of the main developments that have marked the growth of high energy diffractive physics in the past and to assess the present state of the art. For this reason, this part will be by far the largest. The analysis of the relationship between conventional diffractive physics and the low-x physics from deep inelastic scattering will allow us also to review the instruments which could help to understand the developments we can expect from the future.
|
1104.0808
|
Alexander Berezhnoy
|
A.V. Berezhnoy, A. K. Likhoded and A. V. Luchinsky
|
BC_NPI module for the analysis of Bc -> J/psi +n pi and Bc -> B_s +n pi
decays within the EvtGen package
|
15 pages, 4 figures. The misprint has been removed in the last
version
| null | null | null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
The module for the generation of $B_c$ meson decays into $J/\psi + n\pi$ and
$B_s^{(*)} + n\pi$ ($n\le 4$) is implemented into EvtGen program package. The
decay amplitudes are calculated in the frame work of factorization model.
Within this approach the decay can be represented as $B_c$ decay into $J/\psi
(B_s)+W^*$ followed by the virtual $W^*$-boson decay into the final set of
$\pi$-mesons. The described calculation technique allows to adopt the
parameters of $W^*\to n\pi$ transition from the analysis of $\tau$ decay into
$\nu_\tau+n\pi$. Comparison with available theoretical predictions is
performed.
|
[
{
"created": "Tue, 5 Apr 2011 10:58:41 GMT",
"version": "v1"
},
{
"created": "Thu, 7 Apr 2011 10:48:32 GMT",
"version": "v2"
}
] |
2011-04-08
|
[
[
"Berezhnoy",
"A. V.",
""
],
[
"Likhoded",
"A. K.",
""
],
[
"Luchinsky",
"A. V.",
""
]
] |
The module for the generation of $B_c$ meson decays into $J/\psi + n\pi$ and $B_s^{(*)} + n\pi$ ($n\le 4$) is implemented into EvtGen program package. The decay amplitudes are calculated in the frame work of factorization model. Within this approach the decay can be represented as $B_c$ decay into $J/\psi (B_s)+W^*$ followed by the virtual $W^*$-boson decay into the final set of $\pi$-mesons. The described calculation technique allows to adopt the parameters of $W^*\to n\pi$ transition from the analysis of $\tau$ decay into $\nu_\tau+n\pi$. Comparison with available theoretical predictions is performed.
|
0709.4216
|
Bernd-Jochen Schaefer
|
Bernd-Jochen Schaefer (Graz U.)
|
Critical structure of the QCD medium
|
10 pages, 3 figures; to appear in the proceedings of 4th
International Workshop on 'Critical Point and Onset of Deconfinement'
(CPOD2007), GSI Darmstadt, Germany, July 9-13 2007
|
PoSCPOD07:032,2007
| null | null |
hep-ph
| null |
Fluctuations in the vicinity of a phase transition are important but
neglected in mean-field theory. In order to assess the influence of such
fluctuations on the critical endpoint and the size of the critical region in
the QCD phase diagram, a mean-field calculation of a two-flavor quark-meson
model is compared with a renormalization group approach. However, due to the
lack of confinement in this effective model the equation of state near the
chiral phase transition is still unrealistic. A first improvement of this model
can be achieved by coupling quark degrees of freedom to the Polyakov loop,
consequently incorporating certain aspects of confinement. The influence of
these modifications on the resulting phase diagram is discussed.
|
[
{
"created": "Wed, 26 Sep 2007 17:21:12 GMT",
"version": "v1"
}
] |
2009-04-14
|
[
[
"Schaefer",
"Bernd-Jochen",
"",
"Graz U."
]
] |
Fluctuations in the vicinity of a phase transition are important but neglected in mean-field theory. In order to assess the influence of such fluctuations on the critical endpoint and the size of the critical region in the QCD phase diagram, a mean-field calculation of a two-flavor quark-meson model is compared with a renormalization group approach. However, due to the lack of confinement in this effective model the equation of state near the chiral phase transition is still unrealistic. A first improvement of this model can be achieved by coupling quark degrees of freedom to the Polyakov loop, consequently incorporating certain aspects of confinement. The influence of these modifications on the resulting phase diagram is discussed.
|
2311.00413
|
Wen-Fei Wang
|
Yu-Shan Ren, Ai-Jun Ma and Wen-Fei Wang
|
The $\rho(770,1450)\to \omega\pi$ contributions for three-body decays
$B\to\bar{D}^{(*)} \omega\pi$
|
30 pages, 4 figures, the typos in Eq.(2.33) were corrected
|
JHEP01(2024)047
|
10.1007/JHEP01(2024)047
| null |
hep-ph hep-ex
|
http://creativecommons.org/licenses/by/4.0/
|
The decays $B\to\bar{D}^{(*)} \omega\pi$ are very important for the
investigation of $\rho$ excitations and the test of factorization hypothesis
for $B$ meson decays. The $B^{+}\to \bar{D}^{(*)0}\omega\pi^+$ and $B^{0}\to
D^{(*)-}\omega\pi^+$ have been measured by different collaborations but without
any predictions for their observables on theoretical side. In this work, we
study the contributions of $\rho(770,1450)\to \omega\pi$ for the cascade decays
$B^{+}\to \bar{D}^{(*)0} \rho^+ \to \bar{D}^{(*)0}\omega\pi^+$, $B^{0}\to
D^{(*)-} \rho^+ \to D^{(*)-}\omega\pi^+$ and $B_s^{0}\to D_s^{(*)-} \rho^+ \to
D^{(*)-}\omega\pi^+$. We introduce $\rho(770,1450)\to \omega\pi$ subprocesses
into the distribution amplitudes for $\omega\pi$ system via the vector form
factor $F_{\omega\pi}(s)$ and then predict the branching fractions for the
first time for concerned quasi-two-body decays with $\rho(770,1450)\to
\omega\pi$, as well as the corresponding longitudinal polarization fractions
$\Gamma_L/\Gamma$ for the cases with the vector $\bar{D}^{*0}$ or
$D_{(s)}^{*-}$ in their final states. The branching fractions of these
quasi-two-body decays are predicted at the order of $10^{-3}$, which can be
detected at the LHCb and Belle-II experiments. The predictions for the decays
${B}^0 \to{D}^{*-} \rho(770)^+\to {D}^{*-} \omega\pi^+$ and ${B}^0 \to {D}^{*-}
\rho(1450)^+\to {D}^{*-} \omega\pi^+$ agree well with the measurements from
Belle Collaboration. In order to avoid the pollution from annihilation Feynman
diagrams, we recommend to take the $B_s^0 \to D_s^{*-}\rho(770,1450)^+$ decays,
which have only emission diagrams at quark level, to test the factorization
hypothesis for $B$ decays.
|
[
{
"created": "Wed, 1 Nov 2023 10:17:19 GMT",
"version": "v1"
},
{
"created": "Thu, 21 Dec 2023 17:28:39 GMT",
"version": "v2"
},
{
"created": "Mon, 15 Jan 2024 10:03:29 GMT",
"version": "v3"
},
{
"created": "Tue, 12 Mar 2024 10:59:36 GMT",
"version": "v4"
}
] |
2024-03-13
|
[
[
"Ren",
"Yu-Shan",
""
],
[
"Ma",
"Ai-Jun",
""
],
[
"Wang",
"Wen-Fei",
""
]
] |
The decays $B\to\bar{D}^{(*)} \omega\pi$ are very important for the investigation of $\rho$ excitations and the test of factorization hypothesis for $B$ meson decays. The $B^{+}\to \bar{D}^{(*)0}\omega\pi^+$ and $B^{0}\to D^{(*)-}\omega\pi^+$ have been measured by different collaborations but without any predictions for their observables on theoretical side. In this work, we study the contributions of $\rho(770,1450)\to \omega\pi$ for the cascade decays $B^{+}\to \bar{D}^{(*)0} \rho^+ \to \bar{D}^{(*)0}\omega\pi^+$, $B^{0}\to D^{(*)-} \rho^+ \to D^{(*)-}\omega\pi^+$ and $B_s^{0}\to D_s^{(*)-} \rho^+ \to D^{(*)-}\omega\pi^+$. We introduce $\rho(770,1450)\to \omega\pi$ subprocesses into the distribution amplitudes for $\omega\pi$ system via the vector form factor $F_{\omega\pi}(s)$ and then predict the branching fractions for the first time for concerned quasi-two-body decays with $\rho(770,1450)\to \omega\pi$, as well as the corresponding longitudinal polarization fractions $\Gamma_L/\Gamma$ for the cases with the vector $\bar{D}^{*0}$ or $D_{(s)}^{*-}$ in their final states. The branching fractions of these quasi-two-body decays are predicted at the order of $10^{-3}$, which can be detected at the LHCb and Belle-II experiments. The predictions for the decays ${B}^0 \to{D}^{*-} \rho(770)^+\to {D}^{*-} \omega\pi^+$ and ${B}^0 \to {D}^{*-} \rho(1450)^+\to {D}^{*-} \omega\pi^+$ agree well with the measurements from Belle Collaboration. In order to avoid the pollution from annihilation Feynman diagrams, we recommend to take the $B_s^0 \to D_s^{*-}\rho(770,1450)^+$ decays, which have only emission diagrams at quark level, to test the factorization hypothesis for $B$ decays.
|
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