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|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
hep-ph/0404088
|
Hans Volker Klapdor-Kleingrothaus
|
H.V. Klapdor-Kleingrothaus, I.V. Krivosheina, A. Dietz, and O.
Chkvorets (MPI-Kernphysik, Heidelberg, Germany)
|
Search for neutrinoless double beta decay with enriched 76Ge in Gran
Sasso 1990-2003
|
19 pages, latex, 9 figures, 2 tables
|
Phys.Lett.B586:198-212,2004
|
10.1016/j.physletb.2004.02.025
| null |
hep-ph
| null |
The results of the HEIDELBERG-MOSCOW experiment which searches with 11 kg of
enriched 76Ge for double beta decay in the GRAN Sasso underground laboratory
are presented for the full running period August 1990 - May 2003. The duty
cycle of the experiment was ~80%, the collected statistics is 71.7 kg y. The
background achieved in the energy region of the Q value for double beta decay
is 0.11 events/ kg y keV. The two-neutrino accompanied half-life is determined
on the basis of more than 100 000 events. The confidence level for the
neutrinoless signal has been improved to 4.2 sigma.
|
[
{
"created": "Thu, 8 Apr 2004 22:43:31 GMT",
"version": "v1"
}
] |
2008-11-26
|
[
[
"Klapdor-Kleingrothaus",
"H. V.",
"",
"MPI-Kernphysik, Heidelberg, Germany"
],
[
"Krivosheina",
"I. V.",
"",
"MPI-Kernphysik, Heidelberg, Germany"
],
[
"Dietz",
"A.",
"",
"MPI-Kernphysik, Heidelberg, Germany"
],
[
"Chkvorets",
"O.",
"",
"MPI-Kernphysik, Heidelberg, Germany"
]
] |
The results of the HEIDELBERG-MOSCOW experiment which searches with 11 kg of enriched 76Ge for double beta decay in the GRAN Sasso underground laboratory are presented for the full running period August 1990 - May 2003. The duty cycle of the experiment was ~80%, the collected statistics is 71.7 kg y. The background achieved in the energy region of the Q value for double beta decay is 0.11 events/ kg y keV. The two-neutrino accompanied half-life is determined on the basis of more than 100 000 events. The confidence level for the neutrinoless signal has been improved to 4.2 sigma.
|
hep-ph/9502325
| null |
R.Casalbuoni, P.Chiappetta, A.Deandrea, S.De Curtis, D.Dominici and
R.Gatto
|
Some Results on the BESS Model at Future Colliders
|
11 pages, LaTeX (uses epsf), 10 figures (uuencoded tar file),
Contribution to the ESB & BSM Working group of DPF Long Range Planning Study,
Albuquerque, August 7, 1994.
| null | null |
UGVA-DPT 1995/02-883
|
hep-ph
| null |
We present some results on the usefulness of upgraded Tevatron, LHC proton
proton collider and linear e+e- colliders in the TeV range to test the idea of
a strongly interacting sector as responsible for the electroweak symmetry
breaking. The calculations are performed within an effective lagrangian
description, called the BESS model, which provides for a rather general frame
based on the standing point of custodial symmetry and gauge invariance, without
specifying any dynamical scheme.
|
[
{
"created": "Thu, 16 Feb 1995 17:04:13 GMT",
"version": "v1"
}
] |
2016-09-01
|
[
[
"Casalbuoni",
"R.",
""
],
[
"Chiappetta",
"P.",
""
],
[
"Deandrea",
"A.",
""
],
[
"De Curtis",
"S.",
""
],
[
"Dominici",
"D.",
""
],
[
"Gatto",
"R.",
""
]
] |
We present some results on the usefulness of upgraded Tevatron, LHC proton proton collider and linear e+e- colliders in the TeV range to test the idea of a strongly interacting sector as responsible for the electroweak symmetry breaking. The calculations are performed within an effective lagrangian description, called the BESS model, which provides for a rather general frame based on the standing point of custodial symmetry and gauge invariance, without specifying any dynamical scheme.
|
2007.07899
|
Jiang-Hao Yu
|
Hao-Lin Li, Zhe Ren, Ming-Lei Xiao, Jiang-Hao Yu, and Yu-Hui Zheng
|
Complete Set of Dimension-9 Operators in the Standard Model Effective
Field Theory
|
58 pages, 1 figure, 10 tables
|
Phys. Rev. D 104, 015025 (2021)
|
10.1103/PhysRevD.104.015025
| null |
hep-ph hep-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We present a complete and independent list of the dimension 9 operator basis
in the Standard Model effective field theory by an automatic algorithm based on
the amplitude-operator correspondence. A complete basis (y-basis) is first
constructed by enumerating Young tableau of an auxiliary $SU(N)$ group and the
gauge groups, with the equation-of-motion and integration-by-part redundancies
all removed. In the presence of repeated fields, another basis (p-basis) with
explicit flavor symmetries among them is derived from the y-basis, which
further induces a basis of independent monomial operators through a systematic
process called de-symmetrization. Our form of operators have advantages over
the traditional way of presenting operators constrained by flavor relations, in
the simplicity of both eliminating flavor redundancies and identifying
independent flavor-specified operators. We list the 90456 (560) operators for
three (one) generations of fermions, all of which violate baryon number or
lepton number conservation; among them we find new violation patterns as
$\Delta B = 2$ and $\Delta L = 3$, which only appear at the dimensions $d \ge
9$.
|
[
{
"created": "Wed, 15 Jul 2020 18:00:00 GMT",
"version": "v1"
}
] |
2021-07-28
|
[
[
"Li",
"Hao-Lin",
""
],
[
"Ren",
"Zhe",
""
],
[
"Xiao",
"Ming-Lei",
""
],
[
"Yu",
"Jiang-Hao",
""
],
[
"Zheng",
"Yu-Hui",
""
]
] |
We present a complete and independent list of the dimension 9 operator basis in the Standard Model effective field theory by an automatic algorithm based on the amplitude-operator correspondence. A complete basis (y-basis) is first constructed by enumerating Young tableau of an auxiliary $SU(N)$ group and the gauge groups, with the equation-of-motion and integration-by-part redundancies all removed. In the presence of repeated fields, another basis (p-basis) with explicit flavor symmetries among them is derived from the y-basis, which further induces a basis of independent monomial operators through a systematic process called de-symmetrization. Our form of operators have advantages over the traditional way of presenting operators constrained by flavor relations, in the simplicity of both eliminating flavor redundancies and identifying independent flavor-specified operators. We list the 90456 (560) operators for three (one) generations of fermions, all of which violate baryon number or lepton number conservation; among them we find new violation patterns as $\Delta B = 2$ and $\Delta L = 3$, which only appear at the dimensions $d \ge 9$.
|
hep-ph/9607413
|
Matthias Hosch
|
M. Hosch, K. Whisnant, and Bing-Lin Young
|
Unitarity Constraints on Anomalous Top Quark Couplings to Weak Gauge
Bosons
|
12 pages, Latex, 4 postscipt figures included. Resubmitted with major
revisions, including the newest data on $R_b$
|
Phys.Rev. D55 (1997) 3137-3142
|
10.1103/PhysRevD.55.3137
|
AMES-HET-96-04
|
hep-ph
| null |
If there is new physics associated with the top quark, it could show up as
anomalous couplings of the top quark to weak gauge bosons, such as $Z\ttbar$
and $W\tbbar$ vector and axial-vector couplings. We use the processes
$\ttbar\to Z^0Z^0$, $\ttbar\to W^+W^-$, and $\ttbar\to Z^0H$ to obtain the
unitarity constraints on these anomalous couplings, and combine these
constraints with those from precision electroweak data. The unitarity
constraints can impose additional limits on the anomalous couplings when the
scale of new physics is as low as 2 TeV. A nonzero measurement of such an
anomalous coupling leads to an upper limit on the new physics scale from the
unitarity condition.
|
[
{
"created": "Wed, 24 Jul 1996 03:36:29 GMT",
"version": "v1"
},
{
"created": "Tue, 5 Nov 1996 02:16:24 GMT",
"version": "v2"
}
] |
2009-10-28
|
[
[
"Hosch",
"M.",
""
],
[
"Whisnant",
"K.",
""
],
[
"Young",
"Bing-Lin",
""
]
] |
If there is new physics associated with the top quark, it could show up as anomalous couplings of the top quark to weak gauge bosons, such as $Z\ttbar$ and $W\tbbar$ vector and axial-vector couplings. We use the processes $\ttbar\to Z^0Z^0$, $\ttbar\to W^+W^-$, and $\ttbar\to Z^0H$ to obtain the unitarity constraints on these anomalous couplings, and combine these constraints with those from precision electroweak data. The unitarity constraints can impose additional limits on the anomalous couplings when the scale of new physics is as low as 2 TeV. A nonzero measurement of such an anomalous coupling leads to an upper limit on the new physics scale from the unitarity condition.
|
1905.03401
|
Danny Marfatia
|
Wai-Yee Keung, Danny Marfatia, Po-Yan Tseng
|
Annihilation signatures of neutron dark decay models in neutron
oscillation and proton decay searches
|
17 pages, 6 figures, 4 tables. Version to appear in JHEP
|
JHEP 1909:053 (2019)
|
10.1007/JHEP09(2019)053
| null |
hep-ph hep-ex
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We point out that two models that reconcile the neutron lifetime anomaly via
dark decays of the neutron, also predict dark matter-neutron ($\bar{\chi}-n$)
annihilation that may be observable in neutron-antineutron oscillation and
proton decay searches at Super-Kamiokande, Hyper-Kamiokande and DUNE. We study
signatures of $\bar{\chi}n\to \gamma\pi^0$ (or multi-$\pi^0$) and
$\bar{\chi}n\to \phi\gamma\pi^0$ (or $\phi+$multi-$\pi^0$), where $\phi$ is an
almost massless boson in one of the two models.
|
[
{
"created": "Thu, 9 May 2019 01:11:39 GMT",
"version": "v1"
},
{
"created": "Fri, 23 Aug 2019 04:16:14 GMT",
"version": "v2"
}
] |
2019-09-12
|
[
[
"Keung",
"Wai-Yee",
""
],
[
"Marfatia",
"Danny",
""
],
[
"Tseng",
"Po-Yan",
""
]
] |
We point out that two models that reconcile the neutron lifetime anomaly via dark decays of the neutron, also predict dark matter-neutron ($\bar{\chi}-n$) annihilation that may be observable in neutron-antineutron oscillation and proton decay searches at Super-Kamiokande, Hyper-Kamiokande and DUNE. We study signatures of $\bar{\chi}n\to \gamma\pi^0$ (or multi-$\pi^0$) and $\bar{\chi}n\to \phi\gamma\pi^0$ (or $\phi+$multi-$\pi^0$), where $\phi$ is an almost massless boson in one of the two models.
|
1009.1924
|
Hiroaki Kouno
|
Hiroaki Kouno, Yuji Sakai, Takahiro Sasaki, Kouji Kashiwa and Masanobu
Yahiro
|
C and P violations in the PNJL model
|
3 pages, 4 figures, to be published in the proceedings for the YITP
workshop YITP-W-10-08 on "Thermal Quantum Field Theories and Their
Applications", Kyoto, August 30-September 1, 2010
| null | null |
SAGA-HE-263
|
hep-ph hep-lat hep-th nucl-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Using the PNJL model, we investigate C and P violations when theta =pi and
Theta =mu/(iT)=\pi/3, where T, theta and mu are the temperature, the parameter
of theta-vacuum and the quark number chemical potential, respectively. It is
shown that the C violation and the P restoration happen almost simultaneously
at theta=pi and Theta =pi/3, if the deconfinement and the chiral symmetry
restoration happen almost simultaneously at theta =Theta =0.
|
[
{
"created": "Fri, 10 Sep 2010 02:32:36 GMT",
"version": "v1"
}
] |
2010-09-14
|
[
[
"Kouno",
"Hiroaki",
""
],
[
"Sakai",
"Yuji",
""
],
[
"Sasaki",
"Takahiro",
""
],
[
"Kashiwa",
"Kouji",
""
],
[
"Yahiro",
"Masanobu",
""
]
] |
Using the PNJL model, we investigate C and P violations when theta =pi and Theta =mu/(iT)=\pi/3, where T, theta and mu are the temperature, the parameter of theta-vacuum and the quark number chemical potential, respectively. It is shown that the C violation and the P restoration happen almost simultaneously at theta=pi and Theta =pi/3, if the deconfinement and the chiral symmetry restoration happen almost simultaneously at theta =Theta =0.
|
hep-ph/0004255
|
Cheng-Wei Chiang
|
Cheng-Wei Chiang and Lincoln Wolfenstein
|
Using the value of beta to help determine gamma from B decays
|
7 pages, 2 figures; revised version for journal submission; some
points clarified
|
Phys.Lett.B493:73-76,2000
|
10.1016/S0370-2693(00)01135-7
| null |
hep-ph
| null |
It has been pointed out by Gronau and Rosner that the angle gamma of the
unitarity triangle could be determined by combining future results on B_s and
B_d decays to K pi. Here we show that it is important to include in the
analysis the information on the phase beta which will be determined in the near
future. Omitting this information could lead to an error as large as 8 degrees
in gamma.
|
[
{
"created": "Thu, 27 Apr 2000 17:59:56 GMT",
"version": "v1"
},
{
"created": "Fri, 14 Jul 2000 19:15:54 GMT",
"version": "v2"
},
{
"created": "Wed, 30 Aug 2000 16:33:54 GMT",
"version": "v3"
}
] |
2010-11-23
|
[
[
"Chiang",
"Cheng-Wei",
""
],
[
"Wolfenstein",
"Lincoln",
""
]
] |
It has been pointed out by Gronau and Rosner that the angle gamma of the unitarity triangle could be determined by combining future results on B_s and B_d decays to K pi. Here we show that it is important to include in the analysis the information on the phase beta which will be determined in the near future. Omitting this information could lead to an error as large as 8 degrees in gamma.
|
hep-ph/9610522
|
Leo Stodolsky
|
B. Kayser (Division of Physics, National Science Foundation,
Arlington, VA), L. Stodolsky (Max-Planck-Institut fuer Physik, Munich)
|
Cascade Mixing, a New Kind of Particle Mixing Phenomenon
|
13 pages, no figures
| null | null |
MPI-PhT/96-112, NSF-PT-96-1
|
hep-ph
| null |
We discuss ``cascade mixing", where one particle mixture, say a B0, leads to
another, say a K0. A simple analysis is possible in the amplitude approach,
which avoids ``collapses of the wavefunction" and is explicitly covariant. Some
novel possibilities, both of conceptual and perhaps of experimental interest,
arise. For example, we explain how such processes can allow one to ``tune", in
principle, the phase relations in a particle mixture. Also, effects arise
involving combinations of the mass differences of two particle mixtures. We
explain how an intermediate measurement may play the role of a regenerator, so
that in principle regeneration-like effects can be induced for the B0 and D0
systems, despite their short flight paths. The analysis of such process with
respect to CP and the distinction between ``direct" and ``indirect" CP
violation is discussed.
|
[
{
"created": "Tue, 29 Oct 1996 12:22:18 GMT",
"version": "v1"
}
] |
2007-05-23
|
[
[
"Kayser",
"B.",
"",
"Division of Physics, National Science Foundation,\n Arlington, VA"
],
[
"Stodolsky",
"L.",
"",
"Max-Planck-Institut fuer Physik, Munich"
]
] |
We discuss ``cascade mixing", where one particle mixture, say a B0, leads to another, say a K0. A simple analysis is possible in the amplitude approach, which avoids ``collapses of the wavefunction" and is explicitly covariant. Some novel possibilities, both of conceptual and perhaps of experimental interest, arise. For example, we explain how such processes can allow one to ``tune", in principle, the phase relations in a particle mixture. Also, effects arise involving combinations of the mass differences of two particle mixtures. We explain how an intermediate measurement may play the role of a regenerator, so that in principle regeneration-like effects can be induced for the B0 and D0 systems, despite their short flight paths. The analysis of such process with respect to CP and the distinction between ``direct" and ``indirect" CP violation is discussed.
|
2112.08285
|
Ralph Massarczyk
|
R. Massarczyk, P.-H. Chu, and S.R. Elliott
|
Axion emission from nuclear magnetic dipole transitions
|
18 pages, 14 figures
| null |
10.1103/PhysRevD.105.015031
| null |
hep-ph hep-ex nucl-ex
|
http://creativecommons.org/licenses/by-nc-sa/4.0/
|
Nuclear transitions are one possible source of axions but past searches were
restricted to specifc transitions. In this manuscript, we propose to extend the
search for axions and axion-like particles to more a complex environment that
would result in a number of correlated observables. By including creation
mechanisms that have their origin in the Carbon-Nitrogen-Oxygen (CNO) cycle, we
show that the search for solar axions should not only be restricted to the
keV-mass region. We discuss limitations, such as the lifetime and the mass,
that create a challenge for an Earth-bound experiments. We show that it is
possible to use the same creation mechanisms as used in solar axions to search
with a comparable rate at nuclear power reactors.
|
[
{
"created": "Wed, 15 Dec 2021 17:28:13 GMT",
"version": "v1"
}
] |
2022-01-27
|
[
[
"Massarczyk",
"R.",
""
],
[
"Chu",
"P. -H.",
""
],
[
"Elliott",
"S. R.",
""
]
] |
Nuclear transitions are one possible source of axions but past searches were restricted to specifc transitions. In this manuscript, we propose to extend the search for axions and axion-like particles to more a complex environment that would result in a number of correlated observables. By including creation mechanisms that have their origin in the Carbon-Nitrogen-Oxygen (CNO) cycle, we show that the search for solar axions should not only be restricted to the keV-mass region. We discuss limitations, such as the lifetime and the mass, that create a challenge for an Earth-bound experiments. We show that it is possible to use the same creation mechanisms as used in solar axions to search with a comparable rate at nuclear power reactors.
|
1411.7828
|
Juan Nieves Dr.
|
F.-K. Guo, C. Hidalgo-Duque, J. Nieves, A. Ozpineci and M. Pavon
Valderrama
|
Hidden charm and bottom molecular states
|
Talk presented at the "International Conference on Exotic Atoms and
Related Topics - EXA2014", Wien (Austria), September 2014
| null |
10.1007/s10751-015-1141-0
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We investigate heavy quark symmetries for heavy light meson-antimeson systems
in a contact-range effective field theory. In the SU(3) light flavor limit, the
leading order Lagrangian respecting heavy quark spin symmetry contains four
independent counter-terms. Neglecting $1/m_Q$ corrections, three of these low
energy constants can be determ1ined by theorizing a molecular description of
the $X(3872)$ and $Z_b(10610)$ states. Thus, we can predict new hadronic
molecules, in particular the isovector charmonium partners of the $Z_b(10610)$
and the $Z_b(10650)$ states. We also discuss hadron molecules composed of a
heavy meson and a doubly-heavy baryon, which would be related to the heavy
meson-antimeson molecules thanks to the heavy antiquark-diquark symmetry.
Finally, we also study the $X(3872) \to D^0\bar D^0\pi^0$ decay, which is not
only sensitive to the short distance part of the $X(3872)$ molecular wave
function, as the $J/\psi\pi\pi$ and $J/\psi3\pi$ $X(3872)$ decay modes are, but
it is also affected by the long-distance structure of the resonance.
Furthermore, this decay might provide some information on the interaction
between the $D\bar D$ charm mesons.
|
[
{
"created": "Fri, 28 Nov 2014 11:58:55 GMT",
"version": "v1"
}
] |
2015-06-23
|
[
[
"Guo",
"F. -K.",
""
],
[
"Hidalgo-Duque",
"C.",
""
],
[
"Nieves",
"J.",
""
],
[
"Ozpineci",
"A.",
""
],
[
"Valderrama",
"M. Pavon",
""
]
] |
We investigate heavy quark symmetries for heavy light meson-antimeson systems in a contact-range effective field theory. In the SU(3) light flavor limit, the leading order Lagrangian respecting heavy quark spin symmetry contains four independent counter-terms. Neglecting $1/m_Q$ corrections, three of these low energy constants can be determ1ined by theorizing a molecular description of the $X(3872)$ and $Z_b(10610)$ states. Thus, we can predict new hadronic molecules, in particular the isovector charmonium partners of the $Z_b(10610)$ and the $Z_b(10650)$ states. We also discuss hadron molecules composed of a heavy meson and a doubly-heavy baryon, which would be related to the heavy meson-antimeson molecules thanks to the heavy antiquark-diquark symmetry. Finally, we also study the $X(3872) \to D^0\bar D^0\pi^0$ decay, which is not only sensitive to the short distance part of the $X(3872)$ molecular wave function, as the $J/\psi\pi\pi$ and $J/\psi3\pi$ $X(3872)$ decay modes are, but it is also affected by the long-distance structure of the resonance. Furthermore, this decay might provide some information on the interaction between the $D\bar D$ charm mesons.
|
hep-ph/9607279
|
Uma Shankar
|
Mohan Narayan, G. Rajasekaran (IMSc, Madras) and S. Uma Sankar (IIT,
Bombay)
|
Atmospheric neutrinos with three flavor mixing
|
21 pages Revtex, 7 figures as 7 ps files, Zenith angle binned
multi-Gev analysis redone with the Kamiokande detector efficiencies included
|
Phys.Rev. D56 (1997) 437-445
|
10.1103/PhysRevD.56.437
|
IMSc-96/06/18
|
hep-ph
| null |
We analyze the atmospheric neutrino data in the context of three flavor
neutrino oscillations taking account of the matter effects in the earth. With
the hierarchy among the vacuum mass eigenvalues $\mu_3^2 \gg \mu_2^2 \geq
\mu_1^2$, the solution of the atmospheric neutrino problem depends on
$\delta_{31}=\mu_3^2 - \mu_1^2$ and the $13$ and $23$ mixing angles $\phi$ and
$\psi$. Whereas the sub-GeV atmospheric neutrino data imposes only a lower
limit on $\delta_{31} > 10^{-3} eV^2$, the zenith angle dependent suppression
observed in the multi-GeV data limits $\delta_{31}$ from above also. The
allowed regions of the parameter space are strongly constrained by the
multi-GeV data. Combined with our earlier solution to the solar neutrino
problem which depends on $\delta_{21}= \mu_2^2-\mu_1^2$ and the $12$ and $13$
mixing angles $\omega$ and $\phi$, we have obtained the ranges of values of the
five neutrino parameters which solve both the solar and the atmospheric
neutrino problems simultaneously.
|
[
{
"created": "Thu, 11 Jul 1996 07:30:24 GMT",
"version": "v1"
},
{
"created": "Wed, 26 Feb 1997 12:41:39 GMT",
"version": "v2"
}
] |
2009-10-28
|
[
[
"Narayan",
"Mohan",
"",
"IMSc, Madras"
],
[
"Rajasekaran",
"G.",
"",
"IMSc, Madras"
],
[
"Sankar",
"S. Uma",
"",
"IIT,\n Bombay"
]
] |
We analyze the atmospheric neutrino data in the context of three flavor neutrino oscillations taking account of the matter effects in the earth. With the hierarchy among the vacuum mass eigenvalues $\mu_3^2 \gg \mu_2^2 \geq \mu_1^2$, the solution of the atmospheric neutrino problem depends on $\delta_{31}=\mu_3^2 - \mu_1^2$ and the $13$ and $23$ mixing angles $\phi$ and $\psi$. Whereas the sub-GeV atmospheric neutrino data imposes only a lower limit on $\delta_{31} > 10^{-3} eV^2$, the zenith angle dependent suppression observed in the multi-GeV data limits $\delta_{31}$ from above also. The allowed regions of the parameter space are strongly constrained by the multi-GeV data. Combined with our earlier solution to the solar neutrino problem which depends on $\delta_{21}= \mu_2^2-\mu_1^2$ and the $12$ and $13$ mixing angles $\omega$ and $\phi$, we have obtained the ranges of values of the five neutrino parameters which solve both the solar and the atmospheric neutrino problems simultaneously.
|
hep-ph/9510436
|
Adnan Bashir
|
A. Bashir and M.R. Pennington (Durham U.)
|
Constraint on the QED Vertex from the Mass Anomalous Dimension $\gamma_m
= 1$
|
8 pages, LaTeX, October 1995
|
Phys.Rev. D53 (1996) 4694-4697
|
10.1103/PhysRevD.53.4694
|
DTP-95/92 IC/95/353
|
hep-ph
| null |
We discuss the structure of the non-perturbative fermion-boson vertex in
quenched QED. We show that it is possible to construct a vertex which not only
ensures that the fermion propagator is multiplicatively renormalizable, obeys
the appropriate Ward-Takahashi identity, reproduces perturbation theory for
weak couplings and guarantees that the critical coupling at which the mass is
dynamically generated is gauge independent but also makes sure that the value
for the anomalous dimension for the mass function is strictly 1, as Holdom and
Mahanta have proposed.
|
[
{
"created": "Fri, 27 Oct 1995 15:42:11 GMT",
"version": "v1"
}
] |
2009-10-28
|
[
[
"Bashir",
"A.",
"",
"Durham U."
],
[
"Pennington",
"M. R.",
"",
"Durham U."
]
] |
We discuss the structure of the non-perturbative fermion-boson vertex in quenched QED. We show that it is possible to construct a vertex which not only ensures that the fermion propagator is multiplicatively renormalizable, obeys the appropriate Ward-Takahashi identity, reproduces perturbation theory for weak couplings and guarantees that the critical coupling at which the mass is dynamically generated is gauge independent but also makes sure that the value for the anomalous dimension for the mass function is strictly 1, as Holdom and Mahanta have proposed.
|
hep-ph/0308046
|
Tadeusz Wibig
|
T. Wibig (Univ. of Lodz), I. Kurp (INS Lodz)
|
Large Transverse Momenta in Statistical Models of High Energy
Interactions
|
20 pages, 10 figures
|
JHEP 0312 (2003) 039
|
10.1088/1126-6708/2003/12/039
| null |
hep-ph
| null |
The creation of particles with large transverse momenta in high energy
hadronic collisions is a long standing problem. The transition from small-
(soft) to hard- parton scattering `high-pt' events is rather smooth. In this
paper we apply the non-extensive statistical framework to calculate transverse
momentum distributions of long lived hadrons created at energies from low
(sqrt(s)~10 GeV) to the highest energies available in collider experiments
(sqrt(s)~2000 GeV). Satisfactory agreement with the experimental data is
achieved. The systematic increase of the non-extensivity parameter with energy
found can be understood as phenomenological evidence for the increased role of
long range correlations in the hadronization process.
Predictions concerning the rise of average transverse momenta up to the
highest cosmic ray energies are also given and discussed.
|
[
{
"created": "Tue, 5 Aug 2003 09:38:26 GMT",
"version": "v1"
},
{
"created": "Thu, 4 Sep 2003 13:08:31 GMT",
"version": "v2"
},
{
"created": "Mon, 15 Dec 2003 08:11:47 GMT",
"version": "v3"
}
] |
2009-11-10
|
[
[
"Wibig",
"T.",
"",
"Univ. of Lodz"
],
[
"Kurp",
"I.",
"",
"INS Lodz"
]
] |
The creation of particles with large transverse momenta in high energy hadronic collisions is a long standing problem. The transition from small- (soft) to hard- parton scattering `high-pt' events is rather smooth. In this paper we apply the non-extensive statistical framework to calculate transverse momentum distributions of long lived hadrons created at energies from low (sqrt(s)~10 GeV) to the highest energies available in collider experiments (sqrt(s)~2000 GeV). Satisfactory agreement with the experimental data is achieved. The systematic increase of the non-extensivity parameter with energy found can be understood as phenomenological evidence for the increased role of long range correlations in the hadronization process. Predictions concerning the rise of average transverse momenta up to the highest cosmic ray energies are also given and discussed.
|
2405.09526
|
Francesco Giovanni Celiberto
|
Francesco Giovanni Celiberto
|
Forward & Far-Forward Heavy Hadrons with JETHAD: A High-energy Viewpoint
|
39 pages, 7 figures, 475 references. Invited review article
|
Particles 7 (2024), 3, 502-542
|
10.3390/particles7030029
| null |
hep-ph hep-ex nucl-ex nucl-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Inspired by the recent finding that semi-inclusive detections of heavy
hadrons exhibit fair stabilization patterns in high-energy resummed
distributions against (missing) higher-order corrections, we review and extend
our studies on the hadroproduction of light and heavy hadrons tagged in forward
and far-forward rapidity ranges. We analyze the NLL/NLO+ behavior of rapidity
rates and angular multiplicities via the JETHAD method, where the resummation
of next-to-leading energy logarithms and beyond is consistently embodied in the
collinear picture. We explore kinematic regions that are within LHC typical
acceptances, as well as novel sectors accessible thanks the combined tagging of
a far-forward light or heavy hadron at future Forward Physics Facilities and a
of central particle at LHC experiments via a precise timing-coincidence setup.
|
[
{
"created": "Wed, 15 May 2024 17:35:29 GMT",
"version": "v1"
},
{
"created": "Tue, 25 Jun 2024 11:17:34 GMT",
"version": "v2"
}
] |
2024-06-26
|
[
[
"Celiberto",
"Francesco Giovanni",
""
]
] |
Inspired by the recent finding that semi-inclusive detections of heavy hadrons exhibit fair stabilization patterns in high-energy resummed distributions against (missing) higher-order corrections, we review and extend our studies on the hadroproduction of light and heavy hadrons tagged in forward and far-forward rapidity ranges. We analyze the NLL/NLO+ behavior of rapidity rates and angular multiplicities via the JETHAD method, where the resummation of next-to-leading energy logarithms and beyond is consistently embodied in the collinear picture. We explore kinematic regions that are within LHC typical acceptances, as well as novel sectors accessible thanks the combined tagging of a far-forward light or heavy hadron at future Forward Physics Facilities and a of central particle at LHC experiments via a precise timing-coincidence setup.
|
2205.00783
|
Jinwei Wang
|
Jin-Wei Wang, Xiao-Jun Bi, Peng-Fei Yin, Zhao-Huan Yu
|
Electroweak dark matter model accounting for the CDF $W$-mass anomaly
|
23 pages, 5 figures; v3: matches version accepted for publication in
Phys. Rev. D
| null |
10.1103/PhysRevD.106.055001
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Recently, the CDF collaboration reported a new measurement of the $W$ boson
mass $M_W = 80.4335 \pm 0.0094$ GeV, which shows a $\sim 7\sigma$ deviation
from the standard model prediction $80.3545 \pm 0.0057$ GeV obtained by the
electroweak (EW) global fit. This deviation can be explained by new physics
generating moderate EW oblique parameters $S$, $T$, and $U$. In this work, we
use the loop corrections induced by some extra EW multiplets to explain the CDF
$M_W$ anomaly. The lightest neutral particle in the multiplets can also serve
as a candidate of cold dark matter (DM). We consider two such models, namely
singlet-triplet scalar DM and singlet-doublet fermionic DM models, and perform
numerical scans to find the parameter points accounting for the $M_W$ anomaly.
The constraints from the correct DM thermal relic density and direct detection
are also taken into account. We find the parameter points simultaneously
interpreting the $M_W$ anomaly and satisfying the DM requirements in the former
model, but do not find such parameter points in the latter model.
|
[
{
"created": "Mon, 2 May 2022 10:06:29 GMT",
"version": "v1"
},
{
"created": "Fri, 6 May 2022 13:41:31 GMT",
"version": "v2"
},
{
"created": "Tue, 30 Aug 2022 08:58:26 GMT",
"version": "v3"
}
] |
2022-09-14
|
[
[
"Wang",
"Jin-Wei",
""
],
[
"Bi",
"Xiao-Jun",
""
],
[
"Yin",
"Peng-Fei",
""
],
[
"Yu",
"Zhao-Huan",
""
]
] |
Recently, the CDF collaboration reported a new measurement of the $W$ boson mass $M_W = 80.4335 \pm 0.0094$ GeV, which shows a $\sim 7\sigma$ deviation from the standard model prediction $80.3545 \pm 0.0057$ GeV obtained by the electroweak (EW) global fit. This deviation can be explained by new physics generating moderate EW oblique parameters $S$, $T$, and $U$. In this work, we use the loop corrections induced by some extra EW multiplets to explain the CDF $M_W$ anomaly. The lightest neutral particle in the multiplets can also serve as a candidate of cold dark matter (DM). We consider two such models, namely singlet-triplet scalar DM and singlet-doublet fermionic DM models, and perform numerical scans to find the parameter points accounting for the $M_W$ anomaly. The constraints from the correct DM thermal relic density and direct detection are also taken into account. We find the parameter points simultaneously interpreting the $M_W$ anomaly and satisfying the DM requirements in the former model, but do not find such parameter points in the latter model.
|
hep-ph/0006008
|
Rahul Basu
|
Sunanda Banerjee (TIFR, Mumbai) and Rahul Basu (IMSc, Chennai
(Madras))
|
Quark Mass Corrections to the Perturbative Thrust and its Effect on the
determination of $\alpha_s$
|
Latex, 6 pages, 2 figures, minor change in text, added one reference
|
Pramana 59:457-464,2002
|
10.1007/s12043-002-0043-2
|
TIFR/EHEP-00/01, IMSc-2000/06/21
|
hep-ph
| null |
We consider the effects of quark masses to the perturbative thrust in
$e^+e^-$ annihilation. In particular we show that perturbative power
corrections resulting from non-zero quark masses considerably alters the size
of the non-perturbative power corrections and consequently, significantly
changes the fitted value of $\alpha_s$.
|
[
{
"created": "Thu, 1 Jun 2000 13:09:29 GMT",
"version": "v1"
},
{
"created": "Fri, 23 Jun 2000 12:49:57 GMT",
"version": "v2"
}
] |
2015-06-25
|
[
[
"Banerjee",
"Sunanda",
"",
"TIFR, Mumbai"
],
[
"Basu",
"Rahul",
"",
"IMSc, Chennai"
]
] |
We consider the effects of quark masses to the perturbative thrust in $e^+e^-$ annihilation. In particular we show that perturbative power corrections resulting from non-zero quark masses considerably alters the size of the non-perturbative power corrections and consequently, significantly changes the fitted value of $\alpha_s$.
|
1803.06667
|
Yuming Wang
|
Yu-Ming Wang, Yue-Long Shen
|
Subleading-power corrections to the radiative leptonic $B \to \gamma
\ell \nu$ decay in QCD
|
36 pages, 9 figures
| null |
10.1007/JHEP05(2018)184
| null |
hep-ph hep-ex hep-lat
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Applying the method of light-cone sum rules with photon distribution
amplitudes, we compute the subleading-power correction to the radiative
leptonic $B \to \gamma \ell \nu$ decay, at next-to-leading order in QCD for the
twist-two contribution and at leading order in $\alpha_s$ for the higher-twist
contributions, induced by the hadronic component of the collinear photon. The
leading-twist hadronic photon effect turns out to preserve the symmetry
relation between the two $B \to \gamma$ form factors due to the helicity
conservation, however, the higher-twist hadronic photon corrections can yield
symmetry-breaking effect already at tree level in QCD. Using the conformal
expansion of photon distribution amplitudes with the non-perturbative
parameters estimated from QCD sum rules, the twist-two hadronic photon
contribution can give rise to approximately 30\% correction to the
leading-power "direct photon" effect computed from the perturbative QCD
factorization approach. In contrast, the subleading-power corrections from the
higher-twist two-particle and three-particle photon distribution amplitudes are
estimated to be of ${\cal O} (3 \sim 5\%)$ with the light-cone sum rule
approach. We further predict the partial branching fractions of $B \to \gamma
\ell \nu $ with a photon-energy cut $E_{\gamma} \geq E_{\rm cut}$, which are of
interest for determining the inverse moment of the leading-twist $B$-meson
distribution amplitude thanks to the forthcoming high-luminosity Belle II
experiment at KEK.
|
[
{
"created": "Sun, 18 Mar 2018 14:26:54 GMT",
"version": "v1"
}
] |
2018-07-04
|
[
[
"Wang",
"Yu-Ming",
""
],
[
"Shen",
"Yue-Long",
""
]
] |
Applying the method of light-cone sum rules with photon distribution amplitudes, we compute the subleading-power correction to the radiative leptonic $B \to \gamma \ell \nu$ decay, at next-to-leading order in QCD for the twist-two contribution and at leading order in $\alpha_s$ for the higher-twist contributions, induced by the hadronic component of the collinear photon. The leading-twist hadronic photon effect turns out to preserve the symmetry relation between the two $B \to \gamma$ form factors due to the helicity conservation, however, the higher-twist hadronic photon corrections can yield symmetry-breaking effect already at tree level in QCD. Using the conformal expansion of photon distribution amplitudes with the non-perturbative parameters estimated from QCD sum rules, the twist-two hadronic photon contribution can give rise to approximately 30\% correction to the leading-power "direct photon" effect computed from the perturbative QCD factorization approach. In contrast, the subleading-power corrections from the higher-twist two-particle and three-particle photon distribution amplitudes are estimated to be of ${\cal O} (3 \sim 5\%)$ with the light-cone sum rule approach. We further predict the partial branching fractions of $B \to \gamma \ell \nu $ with a photon-energy cut $E_{\gamma} \geq E_{\rm cut}$, which are of interest for determining the inverse moment of the leading-twist $B$-meson distribution amplitude thanks to the forthcoming high-luminosity Belle II experiment at KEK.
|
0910.2514
|
Yue Chongxing
|
Wei Liu, Chong-Xing Yue, Jiao Zhang
|
Lepton flavor violation decays $\tau^-\to \mu^- P_1 P_2$ in the
topcolor-assisted technicolor model and the littlest Higgs model with $T$
parity
|
24 pages, 7 figures
|
Eur.Phys.J.C68:197-207,2010
|
10.1140/epjc/s10052-010-1311-9
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
The new particles predicted by the topcolor-assisted technicolor ($TC2$)
model and the littlest Higgs model with T-parity (called $LHT$ model) can
induce the lepton flavor violation ($LFV$) couplings at tree level or one loop
level, which might generate large contributions to some $LFV$ processes. Taking
into account the constraints of the experimental data on the relevant free
parameters, we calculate the branching ratios of the $LFV$ decay processes
$\tau^-\to\mu^- P_1 P_2 $ with $P_1 P_2$ = $\pi^+\pi^-$, $K^+K^-$ and
$K^0\bar{K^0}$ in the context of these two kinds of new physics models. We find
that the $TC2$ model and the $LHT$ model can indeed produce significant
contributions to some of these $LFV$ decay processes.
|
[
{
"created": "Wed, 14 Oct 2009 02:09:21 GMT",
"version": "v1"
},
{
"created": "Mon, 14 Dec 2009 09:04:33 GMT",
"version": "v2"
},
{
"created": "Sun, 14 Mar 2010 08:29:14 GMT",
"version": "v3"
}
] |
2014-11-20
|
[
[
"Liu",
"Wei",
""
],
[
"Yue",
"Chong-Xing",
""
],
[
"Zhang",
"Jiao",
""
]
] |
The new particles predicted by the topcolor-assisted technicolor ($TC2$) model and the littlest Higgs model with T-parity (called $LHT$ model) can induce the lepton flavor violation ($LFV$) couplings at tree level or one loop level, which might generate large contributions to some $LFV$ processes. Taking into account the constraints of the experimental data on the relevant free parameters, we calculate the branching ratios of the $LFV$ decay processes $\tau^-\to\mu^- P_1 P_2 $ with $P_1 P_2$ = $\pi^+\pi^-$, $K^+K^-$ and $K^0\bar{K^0}$ in the context of these two kinds of new physics models. We find that the $TC2$ model and the $LHT$ model can indeed produce significant contributions to some of these $LFV$ decay processes.
|
hep-ph/0504280
|
L. T. Handoko
|
A. Hartanto (UI) and L.T. Handoko (LIPI, UI)
|
Grand Unified Theory based on the SU(6) symmetry
|
13 pages, 1 figure, a reference added, typos on refs are corrected
|
Phys.Rev.D71:095013,2005
|
10.1103/PhysRevD.71.095013
|
FISIKALIPI-04007, FIS-UI-TH-05-02
|
hep-ph
| null |
We present a complete set of generators for the rank 5 special unitary group,
SU(6), to unify strong, weak and electromagnetic interactions. The unification
is realized through the breaking pattern of SU)6) -> SU(3)_C x SU(3)_H x U(1)_C
followed by SU(3)_H -> SU(2)_L x U(1)_B. All known elementary particles and its
quantum numbers are well accomodated in its {6} and {15} multiplets. These
multiplets require a new neutral fermion which should be assigned as the heavy
Majorana neutrino to realize the seesaw mechanism naturally in the minimal
scenario of this model.
|
[
{
"created": "Fri, 29 Apr 2005 03:12:33 GMT",
"version": "v1"
},
{
"created": "Mon, 9 May 2005 13:12:54 GMT",
"version": "v2"
},
{
"created": "Thu, 26 May 2005 14:46:44 GMT",
"version": "v3"
}
] |
2010-11-24
|
[
[
"Hartanto",
"A.",
"",
"UI"
],
[
"Handoko",
"L. T.",
"",
"LIPI, UI"
]
] |
We present a complete set of generators for the rank 5 special unitary group, SU(6), to unify strong, weak and electromagnetic interactions. The unification is realized through the breaking pattern of SU)6) -> SU(3)_C x SU(3)_H x U(1)_C followed by SU(3)_H -> SU(2)_L x U(1)_B. All known elementary particles and its quantum numbers are well accomodated in its {6} and {15} multiplets. These multiplets require a new neutral fermion which should be assigned as the heavy Majorana neutrino to realize the seesaw mechanism naturally in the minimal scenario of this model.
|
0901.0325
|
Iacopo Mastromatteo
|
Iacopo Mastromatteo, Petros Draggiotis, Manuel Masip
|
Signatures of TeV gravity from the evaporation of cosmogenic black holes
|
13pp. Presented at the Workshop on Black Holes in General Relativity
and String Theory, August 24-30 2008, Veli Losinj, Croatia
|
PoS BHs,GRandStrings 2008:004,2008
| null | null |
hep-ph astro-ph.CO hep-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
TeV gravity models provide a scenario for black hole formation at energies
much smaller than G_N^(-1/2) \sim 10^19 GeV. In particular, the collision of a
ultrahigh energy cosmic ray with a dark matter particle in our galactic halo or
with another cosmic ray could result into a black hole of mass between 10^4 and
10^11 GeV. Once produced, such object would evaporate into elementary particles
via Hawking radiation. We show that the interactions among the particles
exiting the black hole are not able to produce a photosphere nor a
chromosphere. We then evaluate how these particles evolve using the jet-code
HERWIG, and obtain a final diffuse flux of stable 4-dimensional particles
peaked at 0.2 GeV. This flux consists of an approximate 43% of neutrinos, a 28%
of electrons, a 16% of photons and a 13% of protons. Emission into the bulk
would range from a 1.4% of the total energy for n=2 to a 16% for n=6.
|
[
{
"created": "Sat, 3 Jan 2009 15:28:08 GMT",
"version": "v1"
},
{
"created": "Sat, 10 Jan 2009 18:30:14 GMT",
"version": "v2"
}
] |
2010-02-16
|
[
[
"Mastromatteo",
"Iacopo",
""
],
[
"Draggiotis",
"Petros",
""
],
[
"Masip",
"Manuel",
""
]
] |
TeV gravity models provide a scenario for black hole formation at energies much smaller than G_N^(-1/2) \sim 10^19 GeV. In particular, the collision of a ultrahigh energy cosmic ray with a dark matter particle in our galactic halo or with another cosmic ray could result into a black hole of mass between 10^4 and 10^11 GeV. Once produced, such object would evaporate into elementary particles via Hawking radiation. We show that the interactions among the particles exiting the black hole are not able to produce a photosphere nor a chromosphere. We then evaluate how these particles evolve using the jet-code HERWIG, and obtain a final diffuse flux of stable 4-dimensional particles peaked at 0.2 GeV. This flux consists of an approximate 43% of neutrinos, a 28% of electrons, a 16% of photons and a 13% of protons. Emission into the bulk would range from a 1.4% of the total energy for n=2 to a 16% for n=6.
|
2011.02632
|
Nathaniel Sherrill
|
Enrico Lunghi, Nathan Sherrill, Adam Szczepaniak, Alexandre Vieira
|
Quark-sector Lorentz violation in $Z$-boson production
|
Typos in Eq. 3.14 addressed, leading to an updated figure and tables.
Conclusions unchanged
|
JHEP 04, 228 (2021)
|
10.1007/JHEP04(2021)228
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Quark-sector Lorentz violation is studied in the context of Drell-Yan
dilepton production including effects from Z-boson exchange. We show the chiral
nature of the weak interactions enables parity-violating and spin-dependent
effects to be studied using unpolarized initial states. Constraints are placed
on dimensionless and CPT-even coefficients for Lorentz violation for the first
two generations of quarks using measurements from the Large Hadron Collider.
|
[
{
"created": "Thu, 5 Nov 2020 03:19:40 GMT",
"version": "v1"
},
{
"created": "Fri, 23 Apr 2021 18:54:19 GMT",
"version": "v2"
},
{
"created": "Fri, 5 Jul 2024 16:35:33 GMT",
"version": "v3"
}
] |
2024-07-08
|
[
[
"Lunghi",
"Enrico",
""
],
[
"Sherrill",
"Nathan",
""
],
[
"Szczepaniak",
"Adam",
""
],
[
"Vieira",
"Alexandre",
""
]
] |
Quark-sector Lorentz violation is studied in the context of Drell-Yan dilepton production including effects from Z-boson exchange. We show the chiral nature of the weak interactions enables parity-violating and spin-dependent effects to be studied using unpolarized initial states. Constraints are placed on dimensionless and CPT-even coefficients for Lorentz violation for the first two generations of quarks using measurements from the Large Hadron Collider.
|
1406.7795
|
Walter Grimus
|
W. Grimus, P.O. Ludl, L. Nogu\'es
|
Mass renormalization in a toy model with spontaneously broken symmetry
|
12 pages, one figure, erroneous formulas in section 3 corrected, one
reference added, some minor modifications
| null | null |
UWThPh-2014-16
|
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We discuss renormalization in a toy model with one fermion field and one real
scalar field phi, featuring a spontaneously broken discrete symmetry which
forbids a fermion mass term and a phi^3 term in the Lagrangian. We employ a
renormalization scheme which uses the MSbar scheme for the Yukawa and quartic
scalar couplings and renormalizes the vacuum expectation value of phi by
requiring that the one-point function of the shifted field is zero. In this
scheme, the tadpole contributions to the fermion and scalar selfenergies are
canceled by choice of the renormalization parameter delta_v of the vacuum
expectation value. However, delta_v and, therefore, the tadpole contributions
reenter the scheme via the mass renormalization of the scalar, in which place
they are indispensable for obtaining finiteness. We emphasize that the above
renormalization scheme provides a clear formulation of the hierarchy problem
and allows a straightforward generalization to an arbitrary number of fermion
and scalar fields.
|
[
{
"created": "Mon, 30 Jun 2014 16:10:26 GMT",
"version": "v1"
},
{
"created": "Mon, 24 Apr 2017 12:40:56 GMT",
"version": "v2"
}
] |
2017-04-25
|
[
[
"Grimus",
"W.",
""
],
[
"Ludl",
"P. O.",
""
],
[
"Nogués",
"L.",
""
]
] |
We discuss renormalization in a toy model with one fermion field and one real scalar field phi, featuring a spontaneously broken discrete symmetry which forbids a fermion mass term and a phi^3 term in the Lagrangian. We employ a renormalization scheme which uses the MSbar scheme for the Yukawa and quartic scalar couplings and renormalizes the vacuum expectation value of phi by requiring that the one-point function of the shifted field is zero. In this scheme, the tadpole contributions to the fermion and scalar selfenergies are canceled by choice of the renormalization parameter delta_v of the vacuum expectation value. However, delta_v and, therefore, the tadpole contributions reenter the scheme via the mass renormalization of the scalar, in which place they are indispensable for obtaining finiteness. We emphasize that the above renormalization scheme provides a clear formulation of the hierarchy problem and allows a straightforward generalization to an arbitrary number of fermion and scalar fields.
|
1807.04996
|
Aidos Issadykov
|
Aidos Issadykov and Mikhail A. Ivanov
|
b-s Anomaly Decays in Covariant Quark Model
| null |
Phys.Part.Nucl.Lett. 15 (2018) no.4, 393-396
|
10.1134/S1547477118040118
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
The work is devoted to the study of b-s anomaly decays. We evaluated
branching fractions of $B\to K^\ast \mu^+\mu^-$, $B^0_s\to \phi\mu^+\mu^-$ and
$B_s\to \mu^+\mu^-$ decays and compared them with available experimental data
and with results from other theoretical approaches.
|
[
{
"created": "Fri, 13 Jul 2018 10:29:33 GMT",
"version": "v1"
},
{
"created": "Tue, 7 Aug 2018 13:55:56 GMT",
"version": "v2"
}
] |
2018-08-08
|
[
[
"Issadykov",
"Aidos",
""
],
[
"Ivanov",
"Mikhail A.",
""
]
] |
The work is devoted to the study of b-s anomaly decays. We evaluated branching fractions of $B\to K^\ast \mu^+\mu^-$, $B^0_s\to \phi\mu^+\mu^-$ and $B_s\to \mu^+\mu^-$ decays and compared them with available experimental data and with results from other theoretical approaches.
|
hep-ph/0606153
|
Mariano Quiros
|
M. Quiros
|
Introduction to extra dimensions
|
10 pages, 9 figures. To appear in the proceedings of the 41st
Rencontres de Moriond on electroweak Interactions and Unified Theories, La
Thuile, Aosta Valley, Italy, 11-18 March 2006
| null | null | null |
hep-ph
| null |
The aim of this talk is to provide non-experts with a brief and elementary
introduction on the field of extra dimensions. The main motivation for extra
dimensions relies on the more fundamental string theories that predict ten (or
eleven) space-time dimensions. Extra dimensions must be compactified and there
appear branes where gauge and/or gravity propagates. Compactification relates
string constants (string scale and string coupling) with four-dimensional
constants (Planck scale and gauge coupling). Only gravity can propagate in
dimensions transverse to the brane. They can be detected either by
gravitational (table-top) or by collider experiments where Kaluza-Klein
graviton production appears as missing energy. Transverse dimensions can be as
large as the sub-millimeter. Ordinary matter can also propagate in dimensions
parallel to the brane. It can give rise to bumps in the dilepton invariant mass
in hadron colliders or contribute by indirect effects to the electroweak
observables. Longitudinal dimensions can be probed at LHC up to a scale of 6.7
TeV (9 TeV) for one (two) extra dimension(s). Extra dimensions also give rise
to new theoretical ideas related to supersymmetry and electroweak breaking.
Some of these ideas are reviewed.
|
[
{
"created": "Tue, 13 Jun 2006 17:23:21 GMT",
"version": "v1"
}
] |
2007-05-23
|
[
[
"Quiros",
"M.",
""
]
] |
The aim of this talk is to provide non-experts with a brief and elementary introduction on the field of extra dimensions. The main motivation for extra dimensions relies on the more fundamental string theories that predict ten (or eleven) space-time dimensions. Extra dimensions must be compactified and there appear branes where gauge and/or gravity propagates. Compactification relates string constants (string scale and string coupling) with four-dimensional constants (Planck scale and gauge coupling). Only gravity can propagate in dimensions transverse to the brane. They can be detected either by gravitational (table-top) or by collider experiments where Kaluza-Klein graviton production appears as missing energy. Transverse dimensions can be as large as the sub-millimeter. Ordinary matter can also propagate in dimensions parallel to the brane. It can give rise to bumps in the dilepton invariant mass in hadron colliders or contribute by indirect effects to the electroweak observables. Longitudinal dimensions can be probed at LHC up to a scale of 6.7 TeV (9 TeV) for one (two) extra dimension(s). Extra dimensions also give rise to new theoretical ideas related to supersymmetry and electroweak breaking. Some of these ideas are reviewed.
|
2008.05120
|
Stefano Scopel
|
Paolo Gondolo (Utah U.), Sunghyun Kang, Stefano Scopel (Sogang U.) and
Gaurav Tomar (Sogang U. and Technical U. of Munich)
|
The effective theory of nuclear scattering for a WIMP of arbitrary spin
|
47 pages, 4 figures, 8 tables
|
Phys. Rev. D 104, 063017 (2021)
|
10.1103/PhysRevD.104.063017
|
CQUeST-2020-0648
|
hep-ph astro-ph.CO
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We introduce a systematic approach to characterize the most general
non-relativistic WIMP-nucleus interaction allowed by Galilean invariance for a
WIMP of arbitrary spin $j_\chi$ in the approximation of one-nucleon currents.
Five nucleon currents arise from the nonrelativistic limit of the free nucleon
Dirac bilinears. Our procedure consists in (1) organizing the WIMP currents
according to the rank of the $2 j_\chi+1$ irreducible operator products of up
to $2 j_\chi$ WIMP spin vectors, and (2) coupling each of the WIMP currents to
each of the five nucleon currents. The transferred momentum $q$ appears to a
power fixed by rotational invariance. For a WIMP of spin $j_\chi$ we find a
basis of 4+20$j_\chi$ independent operators that exhaust all the possible
operators that drive elastic WIMP-nucleus scattering in the approximation of
one-nucleon currents. By comparing our operator basis, which is complete, to
the operators already introduced in the literature we show that some of the
latter for $j_\chi=1$ were not independent and some were missing. We provide
explicit formulas for the squared scattering amplitudes in terms of the nuclear
response functions, which are available in the literature for most of the
targets used in WIMP direct detection experiments.
|
[
{
"created": "Wed, 12 Aug 2020 05:53:02 GMT",
"version": "v1"
}
] |
2021-09-22
|
[
[
"Gondolo",
"Paolo",
"",
"Utah U."
],
[
"Kang",
"Sunghyun",
"",
"Sogang U."
],
[
"Scopel",
"Stefano",
"",
"Sogang U."
],
[
"Tomar",
"Gaurav",
"",
"Sogang U. and Technical U. of Munich"
]
] |
We introduce a systematic approach to characterize the most general non-relativistic WIMP-nucleus interaction allowed by Galilean invariance for a WIMP of arbitrary spin $j_\chi$ in the approximation of one-nucleon currents. Five nucleon currents arise from the nonrelativistic limit of the free nucleon Dirac bilinears. Our procedure consists in (1) organizing the WIMP currents according to the rank of the $2 j_\chi+1$ irreducible operator products of up to $2 j_\chi$ WIMP spin vectors, and (2) coupling each of the WIMP currents to each of the five nucleon currents. The transferred momentum $q$ appears to a power fixed by rotational invariance. For a WIMP of spin $j_\chi$ we find a basis of 4+20$j_\chi$ independent operators that exhaust all the possible operators that drive elastic WIMP-nucleus scattering in the approximation of one-nucleon currents. By comparing our operator basis, which is complete, to the operators already introduced in the literature we show that some of the latter for $j_\chi=1$ were not independent and some were missing. We provide explicit formulas for the squared scattering amplitudes in terms of the nuclear response functions, which are available in the literature for most of the targets used in WIMP direct detection experiments.
|
hep-ph/0208079
|
Z. Hioki
|
Bohdan Grzadkowski (Warsaw Univ.) and Zenro Hioki (Univ. Tokushima)
|
Decoupling of Anomalous Top-Quark-Decay Vertices in Angular Distribution
of Secondary Particles
|
9 pages, Latex, Final version (to appear in Phys.Lett. B)
|
Phys.Lett. B557 (2003) 55-59
|
10.1016/S0370-2693(03)00187-4
|
IFT-19-02 - TOKUSHIMA Report
|
hep-ph hep-ex
| null |
Angular distribution of a secondary particle from top-quark decays is studied
in a simple and general manner, paying careful attention to how relevant the
top-quark production mechanism is. The conditions that lead to the distribution
free from any possible anomalous top-quark decay interactions are specified. It
is discussed how important the approximations adopted in earlier papers are.
|
[
{
"created": "Thu, 8 Aug 2002 02:37:21 GMT",
"version": "v1"
},
{
"created": "Sat, 8 Feb 2003 05:05:56 GMT",
"version": "v2"
}
] |
2009-11-07
|
[
[
"Grzadkowski",
"Bohdan",
"",
"Warsaw Univ."
],
[
"Hioki",
"Zenro",
"",
"Univ. Tokushima"
]
] |
Angular distribution of a secondary particle from top-quark decays is studied in a simple and general manner, paying careful attention to how relevant the top-quark production mechanism is. The conditions that lead to the distribution free from any possible anomalous top-quark decay interactions are specified. It is discussed how important the approximations adopted in earlier papers are.
|
2304.07317
|
Isabelle John
|
Isabelle John and Tim Linden
|
Accurate Inverse-Compton Models Strongly Enhance Leptophilic Dark Matter
Signals
|
9 pages, 12 figures. Appendix adds 5 pages, 5 figures. Revised
version matches version accepted by PRD
| null | null | null |
hep-ph astro-ph.HE
|
http://creativecommons.org/licenses/by/4.0/
|
The annihilation of TeV-scale leptophilic dark matter into electron-positron
pairs (hereafter $e^+e^-$) will produce a sharp cutoff in the local cosmic-ray
$e^+e^-$ spectrum at an energy matching the dark matter mass. At these high
energies, $e^+e^-$ cool quickly due to synchrotron interactions with magnetic
fields and inverse-Compton scattering with the interstellar radiation field.
These energy losses are typically modelled as a continuous process. However,
inverse-Compton scattering is a stochastic energy-loss process where
interactions are rare but catastrophic. We show that when inverse-Compton
scattering is modelled as a stochastic process, the expected $e^+e^-$ flux from
dark matter annihilation is about a factor of $\sim$2 larger near the dark
matter mass than in the continuous model. This greatly enhances the
detectability of heavy dark matter annihilating to $e^+e^-$ final states.
|
[
{
"created": "Fri, 14 Apr 2023 18:00:00 GMT",
"version": "v1"
},
{
"created": "Mon, 6 Nov 2023 13:22:31 GMT",
"version": "v2"
}
] |
2023-11-07
|
[
[
"John",
"Isabelle",
""
],
[
"Linden",
"Tim",
""
]
] |
The annihilation of TeV-scale leptophilic dark matter into electron-positron pairs (hereafter $e^+e^-$) will produce a sharp cutoff in the local cosmic-ray $e^+e^-$ spectrum at an energy matching the dark matter mass. At these high energies, $e^+e^-$ cool quickly due to synchrotron interactions with magnetic fields and inverse-Compton scattering with the interstellar radiation field. These energy losses are typically modelled as a continuous process. However, inverse-Compton scattering is a stochastic energy-loss process where interactions are rare but catastrophic. We show that when inverse-Compton scattering is modelled as a stochastic process, the expected $e^+e^-$ flux from dark matter annihilation is about a factor of $\sim$2 larger near the dark matter mass than in the continuous model. This greatly enhances the detectability of heavy dark matter annihilating to $e^+e^-$ final states.
|
0801.2229
|
Rikkert Frederix
|
Rikkert Frederix and Massimiliano Grazzini
|
Higher-order QCD effects in the Higgs to ZZ search channel at the LHC
|
12 pages, 8 figures. Discussion on scale uncertainties added
|
Phys.Lett.B662:353-359,2008
|
10.1016/j.physletb.2008.03.030
|
CP3-08-01
|
hep-ph
| null |
We present a consistent analysis of the signal as well as the irreducible
background for the search of the SM Higgs boson in the ZZ decay channel at the
LHC. Soft-gluons effects are resummed up to next-to-leading logarithmic
accuracy, and the results are compared to those obtained with fixed order
calculations and the MC@NLO event generator. The soft-gluon effects are
typically modest but should be taken into account when precise predictions are
demanded. Our results show that the signal over background ratio can be
significantly enhanced with a cut on the transverse momentum pt(ZZ) of the ZZ
pair. We also introduce a fully transverse angular variable that could give
information about the CP nature of the Higgs boson.
|
[
{
"created": "Tue, 15 Jan 2008 09:00:17 GMT",
"version": "v1"
},
{
"created": "Tue, 27 May 2008 08:09:04 GMT",
"version": "v2"
}
] |
2008-11-26
|
[
[
"Frederix",
"Rikkert",
""
],
[
"Grazzini",
"Massimiliano",
""
]
] |
We present a consistent analysis of the signal as well as the irreducible background for the search of the SM Higgs boson in the ZZ decay channel at the LHC. Soft-gluons effects are resummed up to next-to-leading logarithmic accuracy, and the results are compared to those obtained with fixed order calculations and the MC@NLO event generator. The soft-gluon effects are typically modest but should be taken into account when precise predictions are demanded. Our results show that the signal over background ratio can be significantly enhanced with a cut on the transverse momentum pt(ZZ) of the ZZ pair. We also introduce a fully transverse angular variable that could give information about the CP nature of the Higgs boson.
|
2307.04310
|
Guang-Juan Wang
|
Guang-Juan Wang, Makoto Oka, and Daisuke Jido
|
Quark Confinement for Multi-Quark Systems -- Application to
Fully-Charmed Tetraquarks
|
6 pages, 3 figures
| null | null | null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
A new color basis system and confinement mechanism for multi-quark systems
are proposed according to the string-type picture of QCD. The color string
configurations in the strong coupling QCD are implemented in the set of color
basis states. The extended color Hilbert space for $QQ\bar Q\bar Q$ systems
includes a ''hidden color'' state, which mixes with two-meson states $Q\bar
Q+Q\bar Q$, This mixing effect leads to an attractive potential sufficient to
form a bound state. We apply a realistic Hamiltonian model with the new scheme
to fully charmed tetraquark states, $cc\bar c\bar c$, and find a bound and two
resonant states, which could potentially correspond to the $cc\bar c\bar c$
tetraquark candidates recently observed in experiments.
|
[
{
"created": "Mon, 10 Jul 2023 02:52:57 GMT",
"version": "v1"
}
] |
2023-07-11
|
[
[
"Wang",
"Guang-Juan",
""
],
[
"Oka",
"Makoto",
""
],
[
"Jido",
"Daisuke",
""
]
] |
A new color basis system and confinement mechanism for multi-quark systems are proposed according to the string-type picture of QCD. The color string configurations in the strong coupling QCD are implemented in the set of color basis states. The extended color Hilbert space for $QQ\bar Q\bar Q$ systems includes a ''hidden color'' state, which mixes with two-meson states $Q\bar Q+Q\bar Q$, This mixing effect leads to an attractive potential sufficient to form a bound state. We apply a realistic Hamiltonian model with the new scheme to fully charmed tetraquark states, $cc\bar c\bar c$, and find a bound and two resonant states, which could potentially correspond to the $cc\bar c\bar c$ tetraquark candidates recently observed in experiments.
|
1601.00565
|
Jonathan Rosner
|
Marek Karliner and Jonathan L. Rosner
|
Exotic resonances due to $\eta$ exchange
|
6 pages, 1 figure
| null |
10.1016/j.nuclphysa.2016.03.057
|
TAUP 3005/16, EFI 16-1
|
hep-ph hep-ex
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
The meson $X(3872)$ and several related states appear to be, at least in
part, hadronic molecules in which a heavy flavored meson (such as $D^0$) is
bound to another heavy meson (such as $\bar D^{*0}$). Although not the only
effect contributing to the binding, pion exchange seems to play a crucial role
in generating the longest-range force between constituents. Mesons without $u$
and $d$ light quarks (such as $D_s$) cannot exchange pions, but under suitable
circumstances can bind as a result of $\eta$ exchange. Channels in which this
mechanism is possible are identified, and suggestions are made for searches for
the corresponding molecular states, including a manifestly exotic baryonic
$\Lambda_c \bar D_s^*$ resonance decaying into $J/\psi~\Lambda$.
|
[
{
"created": "Mon, 4 Jan 2016 16:52:11 GMT",
"version": "v1"
}
] |
2016-08-24
|
[
[
"Karliner",
"Marek",
""
],
[
"Rosner",
"Jonathan L.",
""
]
] |
The meson $X(3872)$ and several related states appear to be, at least in part, hadronic molecules in which a heavy flavored meson (such as $D^0$) is bound to another heavy meson (such as $\bar D^{*0}$). Although not the only effect contributing to the binding, pion exchange seems to play a crucial role in generating the longest-range force between constituents. Mesons without $u$ and $d$ light quarks (such as $D_s$) cannot exchange pions, but under suitable circumstances can bind as a result of $\eta$ exchange. Channels in which this mechanism is possible are identified, and suggestions are made for searches for the corresponding molecular states, including a manifestly exotic baryonic $\Lambda_c \bar D_s^*$ resonance decaying into $J/\psi~\Lambda$.
|
hep-ph/0201083
|
Ernest Ma
|
Ernest Ma (UC Riverside)
|
New U(1) Gauge Extension of the Supersymmetric Standard Model
|
10 pages, version to appear in PRL
|
Phys.Rev.Lett. 89 (2002) 041801
|
10.1103/PhysRevLett.89.041801
|
UCRHEP-T328
|
hep-ph hep-th
| null |
In extending the minimal standard model of quarks and leptons to include
supersymmetry, the conservation of baryon and lepton numbers is no longer
automatic. I show how the latter may be achieved with a new U(1) gauge symmetry
and new supermultiplets at the TeV scale. Neutrino masses and a solution of the
$\mu$ problem are essential features of this proposed extension.
|
[
{
"created": "Thu, 10 Jan 2002 21:16:12 GMT",
"version": "v1"
},
{
"created": "Thu, 17 Jan 2002 17:05:31 GMT",
"version": "v2"
},
{
"created": "Mon, 17 Jun 2002 20:07:30 GMT",
"version": "v3"
}
] |
2009-11-07
|
[
[
"Ma",
"Ernest",
"",
"UC Riverside"
]
] |
In extending the minimal standard model of quarks and leptons to include supersymmetry, the conservation of baryon and lepton numbers is no longer automatic. I show how the latter may be achieved with a new U(1) gauge symmetry and new supermultiplets at the TeV scale. Neutrino masses and a solution of the $\mu$ problem are essential features of this proposed extension.
|
1705.08423
|
Danny Marfatia
|
Alakabha Datta, Jacky Kumar, Jiajun Liao, Danny Marfatia
|
New light mediators for the $R_K$ and $R_{K^*}$ puzzles
|
8 pages, 3 tables. Expanded version
|
Phys. Rev. D 97, 115038 (2018)
|
10.1103/PhysRevD.97.115038
| null |
hep-ph hep-ex
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
The measurements of $R_{K}$ and $R_K^{*}$ provide hints for the violation of
lepton universality. However, it is generally difficult to explain the
$R_{K^*}$ measurement in the low $q^2$ range, $0.045 \le q^2 \le 1.1$ GeV$^2$.
Light mediators offer a solution by making the Wilson coefficients $q^2$
dependent. We check if new lepton nonuniversal interactions mediated by a
scalar ($S$) or vector particle ($Z^\prime$) of mass between $10-200$ MeV can
reproduce the data. We find that a 25 MeV $Z^\prime$ with a $q^2$-dependent
$b-s$ coupling and that couples to the electron but not the muon can explain
all three anomalies in conjunction with other measurements. A similar 25 MeV
$S$ provides a good fit to all relevant data except $R_{K^*}$ in the low $q^2$
bin. A 25 MeV $Z^\prime$ with a $q^2$-dependent $b-s$ coupling and that couples
to the muon but not the electron provides a good fit to the combination of the
$R_K$ and $R_{K^*}$ data, but does not fit $R_{K^*}$ in the low $q^2$ bin well.
|
[
{
"created": "Tue, 23 May 2017 17:13:43 GMT",
"version": "v1"
},
{
"created": "Thu, 8 Jun 2017 17:40:09 GMT",
"version": "v2"
},
{
"created": "Mon, 30 Apr 2018 18:48:02 GMT",
"version": "v3"
}
] |
2018-06-22
|
[
[
"Datta",
"Alakabha",
""
],
[
"Kumar",
"Jacky",
""
],
[
"Liao",
"Jiajun",
""
],
[
"Marfatia",
"Danny",
""
]
] |
The measurements of $R_{K}$ and $R_K^{*}$ provide hints for the violation of lepton universality. However, it is generally difficult to explain the $R_{K^*}$ measurement in the low $q^2$ range, $0.045 \le q^2 \le 1.1$ GeV$^2$. Light mediators offer a solution by making the Wilson coefficients $q^2$ dependent. We check if new lepton nonuniversal interactions mediated by a scalar ($S$) or vector particle ($Z^\prime$) of mass between $10-200$ MeV can reproduce the data. We find that a 25 MeV $Z^\prime$ with a $q^2$-dependent $b-s$ coupling and that couples to the electron but not the muon can explain all three anomalies in conjunction with other measurements. A similar 25 MeV $S$ provides a good fit to all relevant data except $R_{K^*}$ in the low $q^2$ bin. A 25 MeV $Z^\prime$ with a $q^2$-dependent $b-s$ coupling and that couples to the muon but not the electron provides a good fit to the combination of the $R_K$ and $R_{K^*}$ data, but does not fit $R_{K^*}$ in the low $q^2$ bin well.
|
hep-ph/9608452
| null |
Stefano Moretti (Cavendish Laboratory, Cambridge, UK)
|
Higgs signals and hard photons at the Next Linear Collider: the
$ZZ$-fusion channel in the Standard Model
|
12 pages, LaTeX, 5 PostScript figures embedded using epsfig and
bitmapped at 100dpi, complete paper including high definition figures
available at ftp://axpa.hep.phy.cam.ac.uk/stefano/cavendish_9611.ps or at
http://www.hep.phy.cam.ac.uk/theory/papers/
|
J.Phys.G23:589-596,1997
|
10.1088/0954-3899/23/5/011
|
DFTT 47/96, Cavendish-HEP-96/11, July 1996
|
hep-ph
| null |
In this paper, we extend the analyses carried out in a previous article for
$WW$-fusion to the case of Higgs production via $ZZ$-fusion within the Standard
Model at the Next Linear Collider, in presence of electromagnetic radiation due
real photon emission. Calculations are carried out at tree-level and rates of
the leading order (LO) processes $e^+e^-\rightarrow e^+e^- H \ar e^+e^- b\bar b
$ and $e^+e^-\rightarrow e^+e^- H \ar e^+e^- WW \ar e^+e^- \mathrm{jjjj}$ are
compared to those of the next-to-leading order (NLO) reactions
$e^+e^-\rightarrow e^+e^- H (\gamma)\ar e^+e^- b\bar b \gamma$ and
$e^+e^-\rightarrow e^+e^- H (\gamma)\ar e^+e^- WW (\gamma) \ar e^+e^-
\mathrm{jjjj}\gamma$, in the case of energetic and isolated photons.
|
[
{
"created": "Tue, 27 Aug 1996 16:13:52 GMT",
"version": "v1"
}
] |
2008-11-26
|
[
[
"Moretti",
"Stefano",
"",
"Cavendish Laboratory, Cambridge, UK"
]
] |
In this paper, we extend the analyses carried out in a previous article for $WW$-fusion to the case of Higgs production via $ZZ$-fusion within the Standard Model at the Next Linear Collider, in presence of electromagnetic radiation due real photon emission. Calculations are carried out at tree-level and rates of the leading order (LO) processes $e^+e^-\rightarrow e^+e^- H \ar e^+e^- b\bar b $ and $e^+e^-\rightarrow e^+e^- H \ar e^+e^- WW \ar e^+e^- \mathrm{jjjj}$ are compared to those of the next-to-leading order (NLO) reactions $e^+e^-\rightarrow e^+e^- H (\gamma)\ar e^+e^- b\bar b \gamma$ and $e^+e^-\rightarrow e^+e^- H (\gamma)\ar e^+e^- WW (\gamma) \ar e^+e^- \mathrm{jjjj}\gamma$, in the case of energetic and isolated photons.
|
hep-ph/0104140
|
Kiwoon Choi
|
Kiwoon Choi
|
Axino as a sterile neutrino
|
8 pages, Talk given at Cairo International Conference on High Energy
Physics, Cairo, Egypt, 9-14, January 2001
| null | null | null |
hep-ph
| null |
We present a supersymmetric axion model in which the fermionic superpartner
of axion, i.e. the axino, corresponds to a sterile neutrino which would
accommodate the LSND data with atmospheric and solar neutrino oscillations.
|
[
{
"created": "Sat, 14 Apr 2001 00:49:09 GMT",
"version": "v1"
}
] |
2007-05-23
|
[
[
"Choi",
"Kiwoon",
""
]
] |
We present a supersymmetric axion model in which the fermionic superpartner of axion, i.e. the axino, corresponds to a sterile neutrino which would accommodate the LSND data with atmospheric and solar neutrino oscillations.
|
2112.13777
|
Wei Chao
|
Wei Chao, Jing-jing Feng, Mingjie Jin and Tong Li
|
A new Direct Detection Strategy for the Cosmic Neutrino Background
|
5 pages, 3 figures
| null | null | null |
hep-ph astro-ph.CO
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
The direct detection of cosmic neutrino background (CNB) has been a
longstanding challenge in particle physics, due to its low number density and
tiny neutrino masses. In this work, we consider the spectrum of the CNB boosted
by cosmic rays via the neutrino self-interaction, and calculate the event rate
of the boosted CNB-plasmon scattering in term of the dielectric response, which
accounts for in-medium screening effect of a condensed matter target. This can
be taken as the new direct detection strategy for the CNB in complementary to
the traditional one, which captures the CNB on a $\beta$-unstable nucleus. Our
result shows that one can either see the event of the CNB for the exposure of
per kg$\cdot$year, or puts a strong constraint on the neutrino
self-interaction. We further explore the background induced by the sub-MeV dark
matter and the boosted super-light dark matter.
|
[
{
"created": "Mon, 27 Dec 2021 16:45:36 GMT",
"version": "v1"
}
] |
2021-12-28
|
[
[
"Chao",
"Wei",
""
],
[
"Feng",
"Jing-jing",
""
],
[
"Jin",
"Mingjie",
""
],
[
"Li",
"Tong",
""
]
] |
The direct detection of cosmic neutrino background (CNB) has been a longstanding challenge in particle physics, due to its low number density and tiny neutrino masses. In this work, we consider the spectrum of the CNB boosted by cosmic rays via the neutrino self-interaction, and calculate the event rate of the boosted CNB-plasmon scattering in term of the dielectric response, which accounts for in-medium screening effect of a condensed matter target. This can be taken as the new direct detection strategy for the CNB in complementary to the traditional one, which captures the CNB on a $\beta$-unstable nucleus. Our result shows that one can either see the event of the CNB for the exposure of per kg$\cdot$year, or puts a strong constraint on the neutrino self-interaction. We further explore the background induced by the sub-MeV dark matter and the boosted super-light dark matter.
|
2308.13070
|
Henda Mansour
|
Henda Mansour, Bibhushan Shakya
|
On Particle Production from Phase Transition Bubbles
|
18 pages, 6 figures
| null | null |
DESY-23-121, TTP23-033, P3H-23-056
|
hep-ph astro-ph.CO
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
While first order phase transitions (FOPTs) have been extensively studied as
promising cosmological sources of gravitational waves, the phenomenon of
particle production from the dynamics of the background field during FOPTs has
received relatively little attention in the literature, where it has only been
studied with semi-analytic estimates in some simplified settings. This paper
provides improved numerical studies of this effect in more realistic
frameworks, revealing important qualitative details that have been missed in
the literature. We also provide easy to use analytic formulae that can be used
to calculate particle production in generic FOPT setups.
|
[
{
"created": "Thu, 24 Aug 2023 20:25:39 GMT",
"version": "v1"
}
] |
2023-08-28
|
[
[
"Mansour",
"Henda",
""
],
[
"Shakya",
"Bibhushan",
""
]
] |
While first order phase transitions (FOPTs) have been extensively studied as promising cosmological sources of gravitational waves, the phenomenon of particle production from the dynamics of the background field during FOPTs has received relatively little attention in the literature, where it has only been studied with semi-analytic estimates in some simplified settings. This paper provides improved numerical studies of this effect in more realistic frameworks, revealing important qualitative details that have been missed in the literature. We also provide easy to use analytic formulae that can be used to calculate particle production in generic FOPT setups.
|
hep-ph/9708364
|
Alex Pomarol
|
Gia Dvali and Alex Pomarol
|
Anomalous U(1), Gauge-Mediated Supersymmetry Breaking and Higgs as
Pseudo-Goldstone Bosons
|
17 pages, Latex, 1 figure included
|
Nucl.Phys. B522 (1998) 3-19
|
10.1016/S0550-3213(98)00237-5
|
CERN-TH/97-203
|
hep-ph
| null |
We study the breaking of supersymmetry in models with anomalous U(1). These
models are simple to construct and contain natural candidates for being the
messengers of gauge-mediated supersymmetry breaking. When some of the ordinary
matter fields transform under the anomalous U(1), we find a hybrid scenario in
which the U(1) and the gauge interactions mediate the breaking of
supersymmetry. This leads to a hierarchy of soft masses between the charged and
neutral fields and provides a solution to the $\mu$-problem. Among these
models, we present a scenario in which the Higgs arises as a pseudo-Goldstone
boson. This scenario naturally allows for values of the $\mu$-term and the
scalar soft masses larger than the weak scale.
|
[
{
"created": "Fri, 15 Aug 1997 13:08:06 GMT",
"version": "v1"
}
] |
2009-10-30
|
[
[
"Dvali",
"Gia",
""
],
[
"Pomarol",
"Alex",
""
]
] |
We study the breaking of supersymmetry in models with anomalous U(1). These models are simple to construct and contain natural candidates for being the messengers of gauge-mediated supersymmetry breaking. When some of the ordinary matter fields transform under the anomalous U(1), we find a hybrid scenario in which the U(1) and the gauge interactions mediate the breaking of supersymmetry. This leads to a hierarchy of soft masses between the charged and neutral fields and provides a solution to the $\mu$-problem. Among these models, we present a scenario in which the Higgs arises as a pseudo-Goldstone boson. This scenario naturally allows for values of the $\mu$-term and the scalar soft masses larger than the weak scale.
|
hep-ph/0702248
|
Elise Jennings
|
N.H. Buttimore and E. Jennings
|
Helicity amplitudes and crossing relations for antiproton proton
reactions
|
15 pages, 5 figures, submitted to EPJA
|
Eur.Phys.J.A33:21-27,2007
|
10.1140/epja/i2007-10393-6
| null |
hep-ph
| null |
Antiproton proton annihilation reactions allow unique access to the moduli
and phases of nucleon electromagnetic form factors in the time like region. We
present the helicity amplitudes for the unequal mass single photon reaction $p
\bar{p}\to l^+ l^-$ in the s channel including the lepton mass. The relative
signs of these amplitudes are determined using simple invariance properties.
Helicity amplitudes for the annihilation reaction $p \bar{p} \to N \bar{N}$ are
also given, where $N$ is any spinor particle with structure. Crossing relations
between the $e p \to e p$ scattering and the $p \bar{p}\to l^+ l^-$
annihilation channels are discussed and the crossing matrix for the helicity
amplitudes is given. This matrix may be used to verify known expressions for
the space like helicity amplitudes due to one photon exchange.
|
[
{
"created": "Sat, 24 Feb 2007 11:15:08 GMT",
"version": "v1"
},
{
"created": "Wed, 28 Feb 2007 10:47:22 GMT",
"version": "v2"
},
{
"created": "Fri, 30 Mar 2007 13:07:52 GMT",
"version": "v3"
},
{
"created": "Wed, 4 Apr 2007 11:17:52 GMT",
"version": "v4"
}
] |
2008-11-26
|
[
[
"Buttimore",
"N. H.",
""
],
[
"Jennings",
"E.",
""
]
] |
Antiproton proton annihilation reactions allow unique access to the moduli and phases of nucleon electromagnetic form factors in the time like region. We present the helicity amplitudes for the unequal mass single photon reaction $p \bar{p}\to l^+ l^-$ in the s channel including the lepton mass. The relative signs of these amplitudes are determined using simple invariance properties. Helicity amplitudes for the annihilation reaction $p \bar{p} \to N \bar{N}$ are also given, where $N$ is any spinor particle with structure. Crossing relations between the $e p \to e p$ scattering and the $p \bar{p}\to l^+ l^-$ annihilation channels are discussed and the crossing matrix for the helicity amplitudes is given. This matrix may be used to verify known expressions for the space like helicity amplitudes due to one photon exchange.
|
hep-ph/0302099
|
Gian Paolo Vacca
|
G.P. Vacca
|
Jet Vertex in the Next-to-Leading log(s) Approximation
|
10 pages, 1 figure, latex Kluwer style, Proceedings of the
"Diffraction 2002" workshop, August 31-September 5 2002, Alushta, Crimea,
Ukraine
| null | null | null |
hep-ph
| null |
The next-to-leading corrections to the jet vertex which is relevant for the
Mueller-Navelet jets production in hadronic collisions and for the forward jet
cross section in lepton-hadron collisions are presented in the context of a k_t
factorizazion formula which resums the leading and next-to-leading logarithms
of the energy.
|
[
{
"created": "Thu, 13 Feb 2003 10:43:26 GMT",
"version": "v1"
}
] |
2007-05-23
|
[
[
"Vacca",
"G. P.",
""
]
] |
The next-to-leading corrections to the jet vertex which is relevant for the Mueller-Navelet jets production in hadronic collisions and for the forward jet cross section in lepton-hadron collisions are presented in the context of a k_t factorizazion formula which resums the leading and next-to-leading logarithms of the energy.
|
hep-ph/9509232
|
Takayuki Matsuki
|
Takayuki Matsuki (Tokyo Kasei University) and Toshiyuki Morii (Kobe
Univerity)
|
Spectroscopy and Decays of Heavy Mesons
|
4 pages
| null | null |
TKU-95-1
|
hep-ph
| null |
Assuming Coulomb-like as well as confining scalar potential, we have solved
Shr\"odinger equation perturbatively in $1/m_Q$ with a heavy quark mass $m_Q$.
The lowest order equation is examined carefully. Mass levels are fitted with
experimental data for $D/B$ mesons at each level of perturbation. Meson wave
functions obtained thereby can be used to calculate ordinary form factors as
well as Isgur-Wise functions for semileptonic weak decays and other physical
quantities. All the above calculations are expanded in $1/m_Q$ order by order
to determine parameters as well as to compare with results of Heavy Quark
Effective Theory.
|
[
{
"created": "Wed, 6 Sep 1995 08:04:08 GMT",
"version": "v1"
}
] |
2007-05-23
|
[
[
"Matsuki",
"Takayuki",
"",
"Tokyo Kasei University"
],
[
"Morii",
"Toshiyuki",
"",
"Kobe\n Univerity"
]
] |
Assuming Coulomb-like as well as confining scalar potential, we have solved Shr\"odinger equation perturbatively in $1/m_Q$ with a heavy quark mass $m_Q$. The lowest order equation is examined carefully. Mass levels are fitted with experimental data for $D/B$ mesons at each level of perturbation. Meson wave functions obtained thereby can be used to calculate ordinary form factors as well as Isgur-Wise functions for semileptonic weak decays and other physical quantities. All the above calculations are expanded in $1/m_Q$ order by order to determine parameters as well as to compare with results of Heavy Quark Effective Theory.
|
hep-ph/0608193
|
Adam Aurisano
|
R. Arnowitt, A. Aurisano, B. Dutta, T. Kamon, N. Kolev, P. Simeon, D.
Toback and P. Wagner
|
Measurement of the Stau Minus Neutralino Mass Difference and Mgluino in
the Co-Annihilation Region at the LHC
|
14 pages, 6 figures, and 1 table, Typing error in the title as it
appeared in the web listing is corrected, one reference is added, a few
sentences are modified, results are unchanged
| null | null |
MIFP-0621
|
hep-ph astro-ph hep-ex
| null |
We study the prospects for the measurement of the stau - lightest neutralino
mass difference (dM) and the gluino mass (Mg) in the supersymmetric
co-annihilation region at the LHC using tau leptons. Recent WMAP measurements
of the amount of cold dark matter and previous accelerator experiments indicate
that the coannihilation region of mSUGRA is characterized by a small dM (5-15
GeV). Focusing on taus from N2 -> tau stau -> tau tau N1 decays in gluino and
squark production, we consider inclusive 3 tau+jet+missing Et production, with
two taus above a high Et threshold and a third tau above a lower threshold. Two
observables, the number of opposite-signed tau pairs minus the number of
like-signed tau pairs and the peak of the ditau invariant mass distribution,
allow for the simultaneous determination of dM and Mg for dM >5 GeV. For
example, for dM = 9 GeV and Mg =850 GeV and with 30 fb^-1 of data, we can
measure dM to 15% and Mg to 6%.
|
[
{
"created": "Thu, 17 Aug 2006 20:52:17 GMT",
"version": "v1"
},
{
"created": "Fri, 25 Aug 2006 15:56:47 GMT",
"version": "v2"
}
] |
2007-05-23
|
[
[
"Arnowitt",
"R.",
""
],
[
"Aurisano",
"A.",
""
],
[
"Dutta",
"B.",
""
],
[
"Kamon",
"T.",
""
],
[
"Kolev",
"N.",
""
],
[
"Simeon",
"P.",
""
],
[
"Toback",
"D.",
""
],
[
"Wagner",
"P.",
""
]
] |
We study the prospects for the measurement of the stau - lightest neutralino mass difference (dM) and the gluino mass (Mg) in the supersymmetric co-annihilation region at the LHC using tau leptons. Recent WMAP measurements of the amount of cold dark matter and previous accelerator experiments indicate that the coannihilation region of mSUGRA is characterized by a small dM (5-15 GeV). Focusing on taus from N2 -> tau stau -> tau tau N1 decays in gluino and squark production, we consider inclusive 3 tau+jet+missing Et production, with two taus above a high Et threshold and a third tau above a lower threshold. Two observables, the number of opposite-signed tau pairs minus the number of like-signed tau pairs and the peak of the ditau invariant mass distribution, allow for the simultaneous determination of dM and Mg for dM >5 GeV. For example, for dM = 9 GeV and Mg =850 GeV and with 30 fb^-1 of data, we can measure dM to 15% and Mg to 6%.
|
2207.13373
|
Shu-Yu Ho
|
Shu-Yu Ho
|
An Asymmetric SIMP Dark Matter Model
|
19 pages, 7 figures, 2 tables. Matches published version
|
JHEP10(2022)182
|
10.1007/JHEP10(2022)182
|
KIAS-P22058
|
hep-ph astro-ph.CO
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
In this paper, we construct the first asymmetric strongly interacting massive
particles (SIMP) dark matter (DM) model, where a new vector-like fermion and a
new complex scalar both having nonzero chemical potentials can be asymmetric DM
particles. After the spontaneous breaking of a U(1)$^{}_\textsf{D}$ dark gauge
symmetry, these two particles can have accidental $\mathbb{Z}^{}_4$ charges
making them stable. By adding one more complex scalar as a mediator between the
SIMP DM, the relic density of DM is determined by $3 \to 2$ and two-loop
induced $2 \to 2$ annihilations in this model. On the other hand, the SIMP DM
can maintain kinetic equilibrium with the thermal bath until the DM freeze-out
temperature via the new gauge interaction. Interestingly, this model can have a
bouncing effect on DM, whereby the DM number density rises after the chemical
freeze-out of DM. With this effect, the prediction of the DM self-interacting
cross section in this model can be consistent with astrophysical observations,
and the ratio of the DM energy density to the baryonic matter energy density
can be explained by primordial asymmetries. We also predict the DM-electron
elastic scattering cross section that can be used to test this model in future
projected experiments.
|
[
{
"created": "Wed, 27 Jul 2022 08:57:07 GMT",
"version": "v1"
},
{
"created": "Fri, 28 Oct 2022 08:46:26 GMT",
"version": "v2"
}
] |
2022-10-31
|
[
[
"Ho",
"Shu-Yu",
""
]
] |
In this paper, we construct the first asymmetric strongly interacting massive particles (SIMP) dark matter (DM) model, where a new vector-like fermion and a new complex scalar both having nonzero chemical potentials can be asymmetric DM particles. After the spontaneous breaking of a U(1)$^{}_\textsf{D}$ dark gauge symmetry, these two particles can have accidental $\mathbb{Z}^{}_4$ charges making them stable. By adding one more complex scalar as a mediator between the SIMP DM, the relic density of DM is determined by $3 \to 2$ and two-loop induced $2 \to 2$ annihilations in this model. On the other hand, the SIMP DM can maintain kinetic equilibrium with the thermal bath until the DM freeze-out temperature via the new gauge interaction. Interestingly, this model can have a bouncing effect on DM, whereby the DM number density rises after the chemical freeze-out of DM. With this effect, the prediction of the DM self-interacting cross section in this model can be consistent with astrophysical observations, and the ratio of the DM energy density to the baryonic matter energy density can be explained by primordial asymmetries. We also predict the DM-electron elastic scattering cross section that can be used to test this model in future projected experiments.
|
1008.0398
|
Christoph Weniger
|
Jonas Schmidt, Christoph Weniger, Tsutomu T. Yanagida
|
Dynamical Matter-Parity Breaking and Gravitino Dark Matter
|
20 pages, 1 figure, 1 table
|
Phys.Rev.D82:103517,2010
|
10.1103/PhysRevD.82.103517
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Scenarios where gravitinos with GeV masses make up dark matter are known to
be in tension with high reheating temperatures, as required by e.g. thermal
leptogenesis. This tension comes from the longevity of the NLSPs, which can
destroy the successful predictions of the standard primordial nucleosynthesis.
However, a small violation of matter parity can open new decay channels for the
NLSP, avoiding the BBN problems, while being compatible with experimental
cosmic-ray constraints. In this paper, we propose a model where matter parity,
which we assume to be embedded in the U(1)_{B-L} gauge symmetry, is broken
dynamically in a hidden sector at low scales. This can naturally explain the
smallness of the matter parity breaking in the visible sector. We discuss the
dynamics of the corresponding pseudo Nambu--Goldstone modes of B-L breaking in
the hidden sector, and we comment on typical cosmic-ray and collider signatures
in our model.
|
[
{
"created": "Mon, 2 Aug 2010 20:09:03 GMT",
"version": "v1"
}
] |
2010-12-13
|
[
[
"Schmidt",
"Jonas",
""
],
[
"Weniger",
"Christoph",
""
],
[
"Yanagida",
"Tsutomu T.",
""
]
] |
Scenarios where gravitinos with GeV masses make up dark matter are known to be in tension with high reheating temperatures, as required by e.g. thermal leptogenesis. This tension comes from the longevity of the NLSPs, which can destroy the successful predictions of the standard primordial nucleosynthesis. However, a small violation of matter parity can open new decay channels for the NLSP, avoiding the BBN problems, while being compatible with experimental cosmic-ray constraints. In this paper, we propose a model where matter parity, which we assume to be embedded in the U(1)_{B-L} gauge symmetry, is broken dynamically in a hidden sector at low scales. This can naturally explain the smallness of the matter parity breaking in the visible sector. We discuss the dynamics of the corresponding pseudo Nambu--Goldstone modes of B-L breaking in the hidden sector, and we comment on typical cosmic-ray and collider signatures in our model.
|
2206.12189
|
KeSheng Huang
|
Yan Miao, Hui Deng, Ke-Sheng Huang, Jing Gao, Yue-Long Shen
|
$\Lambda_b \to \Lambda_c$ Form Factors from QCD Light-Cone Sum Rules
|
22 pages, 2figure
| null |
10.1088/1674-1137/ac8652
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
In this work, we calculate the transition form factors of $\Lambda_b$
decaying into $\Lambda_c$ within the framework of light-cone sum rules with the
distribution amplitudes (DAs) of $\Lambda_b$-baryon. In the hadronic
representation of the correlation function, we have isolated both the
$\Lambda_c$ and the $\Lambda_c^*$ states so that the $\Lambda_b \rightarrow
\Lambda_c$ form factors can be obtained without ambiguity. We investigate the
P-type and A-type current to interpolate the light baryons for a comparison
since the interpolation current for the baryon state is not unique. We also
employ three parametrization models for DAs of $\Lambda_b $ in the numerical
calculation. We present the numerical predictions on the $\Lambda_b \rightarrow
\Lambda_c$ form factors and the branching fractions, the averaged
forward-backward asymmetry , the averaged final hadron polarization and the
averaged lepton polarization of the $\Lambda_b \to \Lambda_c \ell\mu$ decays,
as well as the ratio of branching ratios $R_{\Lambda_c}$, and the predicted
$R_{\Lambda_c}$ can be consistent with the LHCb data.
|
[
{
"created": "Fri, 24 Jun 2022 10:00:47 GMT",
"version": "v1"
}
] |
2022-11-23
|
[
[
"Miao",
"Yan",
""
],
[
"Deng",
"Hui",
""
],
[
"Huang",
"Ke-Sheng",
""
],
[
"Gao",
"Jing",
""
],
[
"Shen",
"Yue-Long",
""
]
] |
In this work, we calculate the transition form factors of $\Lambda_b$ decaying into $\Lambda_c$ within the framework of light-cone sum rules with the distribution amplitudes (DAs) of $\Lambda_b$-baryon. In the hadronic representation of the correlation function, we have isolated both the $\Lambda_c$ and the $\Lambda_c^*$ states so that the $\Lambda_b \rightarrow \Lambda_c$ form factors can be obtained without ambiguity. We investigate the P-type and A-type current to interpolate the light baryons for a comparison since the interpolation current for the baryon state is not unique. We also employ three parametrization models for DAs of $\Lambda_b $ in the numerical calculation. We present the numerical predictions on the $\Lambda_b \rightarrow \Lambda_c$ form factors and the branching fractions, the averaged forward-backward asymmetry , the averaged final hadron polarization and the averaged lepton polarization of the $\Lambda_b \to \Lambda_c \ell\mu$ decays, as well as the ratio of branching ratios $R_{\Lambda_c}$, and the predicted $R_{\Lambda_c}$ can be consistent with the LHCb data.
|
hep-ph/0301081
|
Jeppe R. Andersen
|
J.R. Andersen (Univ. of Cambridge) and W.J. Stirling (IPPP, Univ. of
Durham)
|
Energy Consumption and Jet Multiplicity from the Leading Log BFKL
Evolution
| null |
JHEP 0302:018,2003
|
10.1088/1126-6708/2003/02/018
|
Cavendish HEP-2002-21, DAMTP-2002-154, IPPP/02/80, DCPT/02/160
|
hep-ph
| null |
We study the associated jet multiplicity arising from t-channel BFKL gluon
evolution in forward dijet production at hadron colliders. Previous results
have shown that the effect of conserving overall energy and momentum is to
introduce a pdf suppression that completely compensates the predicted
exponential BFKL rise with rapidity difference between the leading dijets.
However, we show that there is still expected to be a significant amount of
BFKL radiation, especially in the central region, and we give predictions for
the multiplicity of the resulting mini-jets at the LHC.
|
[
{
"created": "Mon, 13 Jan 2003 14:03:26 GMT",
"version": "v1"
}
] |
2010-02-03
|
[
[
"Andersen",
"J. R.",
"",
"Univ. of Cambridge"
],
[
"Stirling",
"W. J.",
"",
"IPPP, Univ. of\n Durham"
]
] |
We study the associated jet multiplicity arising from t-channel BFKL gluon evolution in forward dijet production at hadron colliders. Previous results have shown that the effect of conserving overall energy and momentum is to introduce a pdf suppression that completely compensates the predicted exponential BFKL rise with rapidity difference between the leading dijets. However, we show that there is still expected to be a significant amount of BFKL radiation, especially in the central region, and we give predictions for the multiplicity of the resulting mini-jets at the LHC.
|
1009.0103
|
Ilya Gorbunov N
|
G.A. Kozlov, I.N. Gorbunov
|
On decays of Z' into unparticle stuff
|
11 pages, 3 figures, paper accepted for publication by Advances in
High Energy Physics journal
|
Adv.High Energy Phys.2011:975237
|
10.1155/2011/975237
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We study the decay of a Z' - boson into U -unparticle and a photon. The
extended Landau-Yang theorem is used. The clear photon signal would make the
decay Z' \rightarrow \gamma U as an additional contribution mode for study of
unparticle physics.
|
[
{
"created": "Wed, 1 Sep 2010 07:40:51 GMT",
"version": "v1"
},
{
"created": "Fri, 17 Sep 2010 07:41:10 GMT",
"version": "v2"
},
{
"created": "Tue, 22 Mar 2011 11:02:00 GMT",
"version": "v3"
},
{
"created": "Fri, 22 Apr 2011 12:43:27 GMT",
"version": "v4"
}
] |
2011-09-08
|
[
[
"Kozlov",
"G. A.",
""
],
[
"Gorbunov",
"I. N.",
""
]
] |
We study the decay of a Z' - boson into U -unparticle and a photon. The extended Landau-Yang theorem is used. The clear photon signal would make the decay Z' \rightarrow \gamma U as an additional contribution mode for study of unparticle physics.
|
hep-ph/0107055
|
Yoav Achiman
|
Yoav Achiman and Marcus Richter
|
Gauge Mediated Proton Decay in a Renormalizable SUSY SO(10) with
Realistic Mass Matrices
|
10 pages, witout figures; Final version, to be published in Phys.
Lett. B
|
Phys.Lett. B523 (2001) 304-310
|
10.1016/S0370-2693(01)01357-0
|
TAUP 2676-2001 and WUB 01-02
|
hep-ph astro-ph hep-ex
| null |
Proton decay via d=5 operators is excluded by now not only in the framework
of SUSY SU(5) but also its extensions like SUSY SO(10) are on the verge of
being inconsistent with d=5 decays. It is reasonable therefore to suppress,
e.g. by a symmetry, the d=5 operators and to consider gauge boson induced d=6
decays. This is suggested in several recent papers in the framework of models
with a lighter $ M_X$. We discuss here explicitly the fermionic sector of such
a renormalizable SUSY SO(10) with realistic mass matrices. We find that the
recently ``observed'' large leptonic mixing leads to an enhancement of the
nucleon decay channels involving $\mu$'s and in particular the $\mu^+\pi^o$,
$\mu^+\pi^-$ modes.
|
[
{
"created": "Thu, 5 Jul 2001 16:52:54 GMT",
"version": "v1"
},
{
"created": "Wed, 18 Jul 2001 08:24:31 GMT",
"version": "v2"
},
{
"created": "Tue, 27 Nov 2001 14:36:34 GMT",
"version": "v3"
}
] |
2009-11-07
|
[
[
"Achiman",
"Yoav",
""
],
[
"Richter",
"Marcus",
""
]
] |
Proton decay via d=5 operators is excluded by now not only in the framework of SUSY SU(5) but also its extensions like SUSY SO(10) are on the verge of being inconsistent with d=5 decays. It is reasonable therefore to suppress, e.g. by a symmetry, the d=5 operators and to consider gauge boson induced d=6 decays. This is suggested in several recent papers in the framework of models with a lighter $ M_X$. We discuss here explicitly the fermionic sector of such a renormalizable SUSY SO(10) with realistic mass matrices. We find that the recently ``observed'' large leptonic mixing leads to an enhancement of the nucleon decay channels involving $\mu$'s and in particular the $\mu^+\pi^o$, $\mu^+\pi^-$ modes.
|
hep-ph/9408282
| null |
Hisashi Kikuchi and Ernest Ma
|
Heavy Tau Neutrino as the Late Decaying Particle in the Cold Dark Matter
Scenario
|
10 pages (LaTeX) + 1 figure (Its PostScript file is attached after
the LaTeX text. The figure is also available upon request.), UCRHEP-T131
|
Phys.Rev.D51:296-299,1995
|
10.1103/PhysRevD.51.296
| null |
hep-ph astro-ph
| null |
The tau neutrino with a mass of about 10 MeV can be the ``late decaying
particle'' in the cold dark matter scenario for the formation of structure in
the Universe. We show how this may be realized specifically in the recently
proposed doublet Majoron model.
|
[
{
"created": "Sat, 13 Aug 1994 00:25:49 GMT",
"version": "v1"
}
] |
2009-12-30
|
[
[
"Kikuchi",
"Hisashi",
""
],
[
"Ma",
"Ernest",
""
]
] |
The tau neutrino with a mass of about 10 MeV can be the ``late decaying particle'' in the cold dark matter scenario for the formation of structure in the Universe. We show how this may be realized specifically in the recently proposed doublet Majoron model.
|
0808.2043
|
Alexander Nesterenko
|
A.V. Nesterenko
|
On the low-energy behavior of the Adler function
|
Talk given at 14th International QCD Conference (QCD 08), 7 - 12 July
2008, Montpellier, France; 4 pages, 1 figure
|
Nucl. Phys. B (Proc. Suppl.) 186 (2009) 207-210
|
10.1016/j.nuclphysbps.2008.12.048
| null |
hep-ph hep-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
The infrared behavior of the Adler function is examined by making use of a
recently derived integral representation for the latter. The obtained result
for the Adler function agrees with its experimental prediction in the entire
energy range. The inclusive $\tau$ lepton decay is studied in the framework of
the developed approach.
|
[
{
"created": "Thu, 14 Aug 2008 19:00:22 GMT",
"version": "v1"
}
] |
2009-03-16
|
[
[
"Nesterenko",
"A. V.",
""
]
] |
The infrared behavior of the Adler function is examined by making use of a recently derived integral representation for the latter. The obtained result for the Adler function agrees with its experimental prediction in the entire energy range. The inclusive $\tau$ lepton decay is studied in the framework of the developed approach.
|
2304.11038
|
Gang l\"u
|
Gang L\"u, Xi-Liang Yuan, Na-Wang, Xin-Heng Guo
|
CP asymmetry from resonance effect of B meson decay process with $\pi$
and K final states
| null | null | null | null |
hep-ph
|
http://creativecommons.org/licenses/by/4.0/
|
We introduce the new resonance of $V\rightarrow K^{+}K^{-}$ $(V=\phi, \rho,
\omega)$, which produces some new strong phase associated with vector meson
resonance and thus can cause relatively large CP asymmetry at the range of
interferences. There are the resonances of $\phi \rightarrow K^{+}K^{-}$, $\rho
\rightarrow K^{+}K^{-}$ and $\omega \rightarrow K^{+}K^{-}$ due to the mixing
of vector mesons $\phi$, $\rho$, $\omega$. We calculate the CP asymmetry from
the decay modes of $B \rightarrow KK\pi(K)$. Meanwhile, the localised CP
asymmetries are presented and some detailed analysis can be found. The CP
asymmetry from the decay mode of ${B}^{-}\rightarrow \phi\pi^{-}\rightarrow
K^{+}K^{-}\pi^{-}$ is also presented in our framework which is well consisted
with LHC experiment. The introduced CP asymmetry can provide a favorable
theoretical support for the experimental exploration in the future.
|
[
{
"created": "Fri, 21 Apr 2023 15:37:15 GMT",
"version": "v1"
}
] |
2023-04-24
|
[
[
"Lü",
"Gang",
""
],
[
"Yuan",
"Xi-Liang",
""
],
[
"Na-Wang",
"",
""
],
[
"Guo",
"Xin-Heng",
""
]
] |
We introduce the new resonance of $V\rightarrow K^{+}K^{-}$ $(V=\phi, \rho, \omega)$, which produces some new strong phase associated with vector meson resonance and thus can cause relatively large CP asymmetry at the range of interferences. There are the resonances of $\phi \rightarrow K^{+}K^{-}$, $\rho \rightarrow K^{+}K^{-}$ and $\omega \rightarrow K^{+}K^{-}$ due to the mixing of vector mesons $\phi$, $\rho$, $\omega$. We calculate the CP asymmetry from the decay modes of $B \rightarrow KK\pi(K)$. Meanwhile, the localised CP asymmetries are presented and some detailed analysis can be found. The CP asymmetry from the decay mode of ${B}^{-}\rightarrow \phi\pi^{-}\rightarrow K^{+}K^{-}\pi^{-}$ is also presented in our framework which is well consisted with LHC experiment. The introduced CP asymmetry can provide a favorable theoretical support for the experimental exploration in the future.
|
1703.08333
|
Miguel Crispim Rom\~ao
|
Miguel Crispim Romao, Stephen F. King
|
Starobinsky-like inflation in no-scale supergravity Wess-Zumino model
with Polonyi term
|
13 pages, 4 figures
| null | null | null |
hep-ph astro-ph.CO gr-qc hep-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We propose a simple modification of the no-scale supergravity Wess-Zumino
model of Starobinsky-like inflation to include a Polonyi term in the
superpotential. The purpose of this term is to provide an explicit mechanism
for supersymmetry breaking at the end of inflation. We show how successful
inflation can be achieved for a gravitino mass satisfying the strict upper
bound $m_{3/2}< 10^3$ TeV, with favoured values $m_{3/2}\lesssim\mathcal{O}(1)$
TeV. The model suggests that SUSY may be discovered in collider physics
experiments such as the LHC or the FCC.
|
[
{
"created": "Fri, 24 Mar 2017 10:00:41 GMT",
"version": "v1"
}
] |
2017-03-27
|
[
[
"Romao",
"Miguel Crispim",
""
],
[
"King",
"Stephen F.",
""
]
] |
We propose a simple modification of the no-scale supergravity Wess-Zumino model of Starobinsky-like inflation to include a Polonyi term in the superpotential. The purpose of this term is to provide an explicit mechanism for supersymmetry breaking at the end of inflation. We show how successful inflation can be achieved for a gravitino mass satisfying the strict upper bound $m_{3/2}< 10^3$ TeV, with favoured values $m_{3/2}\lesssim\mathcal{O}(1)$ TeV. The model suggests that SUSY may be discovered in collider physics experiments such as the LHC or the FCC.
|
1010.6021
|
Seong Chan Park
|
Yoonbai Kim, Seong Chan Park
|
Hyperbolic Inflation
|
5 pages
|
Phys.Rev.D83:066009,2011
|
10.1103/PhysRevD.83.066009
| null |
hep-ph gr-qc hep-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We propose a natural scenario for the cosmological inflation with the
non-minimal coupling term invoking compact hyperbolic extra dimensions. Thanks
to the unique mathematical properties of compact hyperbolic space, the large
volume of extra dimensions, which provides a natural understanding of the
proper size of couplings, does not necessarily accompany with the low
Kaluza-Klein scale so that the model allows a single field inflation with a
scale around $10^{13}$ GeV. The model fulfills all the observed data and
predicts a sizable gravitational perturbation, r~0.003.
|
[
{
"created": "Thu, 28 Oct 2010 17:22:28 GMT",
"version": "v1"
},
{
"created": "Tue, 15 Feb 2011 23:20:17 GMT",
"version": "v2"
}
] |
2011-03-22
|
[
[
"Kim",
"Yoonbai",
""
],
[
"Park",
"Seong Chan",
""
]
] |
We propose a natural scenario for the cosmological inflation with the non-minimal coupling term invoking compact hyperbolic extra dimensions. Thanks to the unique mathematical properties of compact hyperbolic space, the large volume of extra dimensions, which provides a natural understanding of the proper size of couplings, does not necessarily accompany with the low Kaluza-Klein scale so that the model allows a single field inflation with a scale around $10^{13}$ GeV. The model fulfills all the observed data and predicts a sizable gravitational perturbation, r~0.003.
|
1512.09089
|
Joseph D. Lykken
|
Ian Low and Joseph Lykken
|
Implications of Gauge Invariance on a Heavy Diphoton Resonance
|
5 pages, 2 figures
| null | null |
FERMILAB-PUB-15-583-T
|
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Assuming a heavy electroweak singlet scalar, which couples to the Standard
Model gauge bosons only through loop-induced couplings, SU(2)_L x U(1)_Y gauge
invariance imposes interesting patterns on its decays into electroweak gauge
bosons, which are dictated by only two free parameters. Therefore experimental
measurements on any two of the four possible electroweak channels would
determine the remaining two decay channels completely. Furthermore, searches in
the WW/ZZ channels probe a complimentary region of parameter space from
searches in the gamma-gamma/Z-gamma channels. We derive a model-independent
upper bound on the branching fraction in each decay channel, which for the
diphoton channel turns out to be about 61%. Including the coupling to gluons,
the upper bound on the diphoton branching fraction implies an upper bound on
the mass scale of additional colored particles mediating the gluon-fusion
production. Using an event rate of about 5 fb for the reported 750 GeV diphoton
excess, we find the new colored particle must be lighter than O(1.7 TeV) and
O(2.6 TeV) for a pure CP-even and a pure CP-odd singlet scalar, respectively.
|
[
{
"created": "Wed, 30 Dec 2015 20:07:23 GMT",
"version": "v1"
}
] |
2015-12-31
|
[
[
"Low",
"Ian",
""
],
[
"Lykken",
"Joseph",
""
]
] |
Assuming a heavy electroweak singlet scalar, which couples to the Standard Model gauge bosons only through loop-induced couplings, SU(2)_L x U(1)_Y gauge invariance imposes interesting patterns on its decays into electroweak gauge bosons, which are dictated by only two free parameters. Therefore experimental measurements on any two of the four possible electroweak channels would determine the remaining two decay channels completely. Furthermore, searches in the WW/ZZ channels probe a complimentary region of parameter space from searches in the gamma-gamma/Z-gamma channels. We derive a model-independent upper bound on the branching fraction in each decay channel, which for the diphoton channel turns out to be about 61%. Including the coupling to gluons, the upper bound on the diphoton branching fraction implies an upper bound on the mass scale of additional colored particles mediating the gluon-fusion production. Using an event rate of about 5 fb for the reported 750 GeV diphoton excess, we find the new colored particle must be lighter than O(1.7 TeV) and O(2.6 TeV) for a pure CP-even and a pure CP-odd singlet scalar, respectively.
|
1811.11743
|
Najimuddin Khan
|
Biplob Bhattacherjee, Najimuddin Khan and Ayon Patra
|
Anatomy of Heavy Gauge Bosons in a Left-Right Supersymmetric Model
|
54 Pages
|
Phys. Rev. D 100, 075010 (2019)
|
10.1103/PhysRevD.100.075010
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We perform a detailed study of the various decay channels of the heavy
charged and neutral gauge bosons ($W_R$ and $Z_R$ respectively) in a left-right
supersymmetric (LRSUSY) framework. The decay branching ratios of the $W_R$ and
$Z_R$ bosons depend significantly on the particle spectrum and composition of
the SUSY states. We show several combinations of mass spectrum for the SUSY
particles to facilitate the decay of these heavy gauge bosons into various
combinations of final states. Finally, we choose two benchmark points and
perform detailed collider simulations for these heavy gauge bosons in the
context of the high energy and high luminosity run of the large hadron
collider. We analyze two SUSY cascade decay channels -- mono-$W$ +
$\slashed{E}_T$ and mono-$Z$ + $\slashed{E}_T$ along with the standard dilepton
and dijet final states. Our results show that the existence of these heavy
gauge bosons can be ascertained in the direct decay channels of dilepton and
dijet whereas the other two channels will be required to establish the
supersymmetric nature of this model.
|
[
{
"created": "Wed, 28 Nov 2018 18:59:16 GMT",
"version": "v1"
}
] |
2019-10-16
|
[
[
"Bhattacherjee",
"Biplob",
""
],
[
"Khan",
"Najimuddin",
""
],
[
"Patra",
"Ayon",
""
]
] |
We perform a detailed study of the various decay channels of the heavy charged and neutral gauge bosons ($W_R$ and $Z_R$ respectively) in a left-right supersymmetric (LRSUSY) framework. The decay branching ratios of the $W_R$ and $Z_R$ bosons depend significantly on the particle spectrum and composition of the SUSY states. We show several combinations of mass spectrum for the SUSY particles to facilitate the decay of these heavy gauge bosons into various combinations of final states. Finally, we choose two benchmark points and perform detailed collider simulations for these heavy gauge bosons in the context of the high energy and high luminosity run of the large hadron collider. We analyze two SUSY cascade decay channels -- mono-$W$ + $\slashed{E}_T$ and mono-$Z$ + $\slashed{E}_T$ along with the standard dilepton and dijet final states. Our results show that the existence of these heavy gauge bosons can be ascertained in the direct decay channels of dilepton and dijet whereas the other two channels will be required to establish the supersymmetric nature of this model.
|
1509.03148
|
Antonio Palazzo
|
Antonio Palazzo
|
3-flavor and 4-flavor implications of the latest T2K and NO$\nu$A
electron (anti-)neutrino appearance results
|
14 pages, 5 figures. Acknowledgments modified. Accepted for
publication in Physics Letters B. arXiv admin note: text overlap with
arXiv:1412.7524
| null |
10.1016/j.physletb.2016.03.061
| null |
hep-ph hep-ex
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
The two long-baseline experiments T2K and NO$\nu$A have recently presented
new findings. T2K has shown the first $\bar \nu_e$ appearance data while
NO$\nu$A has released the first $\nu_e$ appearance results. These data are of
particular importance because they allow us to probe for the first time in a
direct (or manifest) way the leptonic CP-violation. In fact, it is the first
time that a hint of CP-violation arises from the comparison of the observations
of neutrinos and antineutrinos. We consider the implications of such new
results both for the standard 3-flavor framework and for the non-standard 3+1
scheme involving one sterile neutrino species. The 3-flavor analysis shows a
consolidation of the previous trends, namely a slight preference for $\sin
\delta <0$, disfavoring CP conservation ($\delta =0, \pi$) with a statistical
significance close to $90\%$ C.L., and a mild preference (at more than 68\%
C.L.) for the normal hierarchy. In a 3+1 framework, the data constrain two
CP-phases ($\delta_{13} \equiv \delta$ and $\delta_{14}$), which exhibit a
slight preference for the common value $\delta_{13} \simeq \delta_{14} \simeq
-\pi/2 $. Interestingly, in the enlarged four neutrino scheme the preference
for the normal hierarchy found within the 3-flavor framework completely
disappears. This indicates that light sterile neutrinos may constitute a
potential source of fragility in the capability of the two LBL experiments of
discriminating the neutrino mass hierarchy.
|
[
{
"created": "Thu, 10 Sep 2015 13:38:48 GMT",
"version": "v1"
},
{
"created": "Tue, 22 Mar 2016 11:05:41 GMT",
"version": "v2"
}
] |
2016-05-04
|
[
[
"Palazzo",
"Antonio",
""
]
] |
The two long-baseline experiments T2K and NO$\nu$A have recently presented new findings. T2K has shown the first $\bar \nu_e$ appearance data while NO$\nu$A has released the first $\nu_e$ appearance results. These data are of particular importance because they allow us to probe for the first time in a direct (or manifest) way the leptonic CP-violation. In fact, it is the first time that a hint of CP-violation arises from the comparison of the observations of neutrinos and antineutrinos. We consider the implications of such new results both for the standard 3-flavor framework and for the non-standard 3+1 scheme involving one sterile neutrino species. The 3-flavor analysis shows a consolidation of the previous trends, namely a slight preference for $\sin \delta <0$, disfavoring CP conservation ($\delta =0, \pi$) with a statistical significance close to $90\%$ C.L., and a mild preference (at more than 68\% C.L.) for the normal hierarchy. In a 3+1 framework, the data constrain two CP-phases ($\delta_{13} \equiv \delta$ and $\delta_{14}$), which exhibit a slight preference for the common value $\delta_{13} \simeq \delta_{14} \simeq -\pi/2 $. Interestingly, in the enlarged four neutrino scheme the preference for the normal hierarchy found within the 3-flavor framework completely disappears. This indicates that light sterile neutrinos may constitute a potential source of fragility in the capability of the two LBL experiments of discriminating the neutrino mass hierarchy.
|
hep-ph/9808247
|
Badri Magradze
|
B. Magradze (Tbilisi Mathematical Institute)
|
The Gluon Propagator in Analytic Perturbation Theory
|
Extended version of the Talk presented at the International Seminar
"QUARKs-98", Suzdal, Russia, May 17-24, 1998, 13 pages in LaTeX, no figures
|
Proceedings of the 10th International Seminar QUARKS`98 V1
p.158-169, Moscow 1999
| null |
G-TMI-98-08-01
|
hep-ph hep-th
| null |
The structure of the beta function of massless QCD is considered in analytic
perturbation theory (APT). The two-loop analytic effective coupling is written
in terms of the Lambert W function. The method of APT is applied to the gluon
propagator in the Landau gauge. It is shown that there is an nonperturbative
ambiguity in determination of the anomalous dimension function of the gluon
field. One possible resolution of the ambiguity is presented.
|
[
{
"created": "Thu, 6 Aug 1998 15:08:48 GMT",
"version": "v1"
}
] |
2012-11-26
|
[
[
"Magradze",
"B.",
"",
"Tbilisi Mathematical Institute"
]
] |
The structure of the beta function of massless QCD is considered in analytic perturbation theory (APT). The two-loop analytic effective coupling is written in terms of the Lambert W function. The method of APT is applied to the gluon propagator in the Landau gauge. It is shown that there is an nonperturbative ambiguity in determination of the anomalous dimension function of the gluon field. One possible resolution of the ambiguity is presented.
|
1003.0087
|
Krzysztof Rolbiecki
|
K. Rolbiecki, G. Moortgat-Pick, J. Tattersall, P. Wienemann
|
Probing CP Violation with Kinematic Reconstruction at the LHC
|
5 pages, 5 figures, submitted to the proceedings of the 9th Hellenic
School on Elementary Particle Physics and Gravity, Corfu 2009
| null |
10.1002/prop.201000044
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We discuss the potential of observing effects of CP-violation phases in
squark decay chains at the LHC. As the CP-odd observable, we use the asymmetry
composed by triple products of final state momenta. There are good prospects of
observing these effects using the method of kinematic reconstruction for the
final and intermediate state particles. We also discuss the main experimental
factors and the expected sensitivity.
|
[
{
"created": "Sat, 27 Feb 2010 11:06:24 GMT",
"version": "v1"
}
] |
2015-05-18
|
[
[
"Rolbiecki",
"K.",
""
],
[
"Moortgat-Pick",
"G.",
""
],
[
"Tattersall",
"J.",
""
],
[
"Wienemann",
"P.",
""
]
] |
We discuss the potential of observing effects of CP-violation phases in squark decay chains at the LHC. As the CP-odd observable, we use the asymmetry composed by triple products of final state momenta. There are good prospects of observing these effects using the method of kinematic reconstruction for the final and intermediate state particles. We also discuss the main experimental factors and the expected sensitivity.
|
1612.01176
|
Jose Rodriguez-Quintero
|
N. Chouika, C. Mezrag, H. Moutarde, J. Rodr\'iguez-Quintero
|
An algebraic model for the pion's valence-quark GPD
|
8 pages, 4 figues, Light Cone 2016
| null | null | null |
hep-ph nucl-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We briefly report on a recent computation, with the help of a fruitful
algebraic model, sketching the pion valence dressed-quark generalized parton
distribution. Then, preliminary, we introduce on a sensible procedure to get
reliable results in both Dokshitzer-Gribov-Lipatov-Altarelli-Parisi (DGLAP) and
Efremov-Radyushkin-Brodsky-Lepage (ERBL) kinematical regions, grounded on the
GPD overlap representation and its parametrization of a Radon transform of the
so-called double distribution (DD).
|
[
{
"created": "Sun, 4 Dec 2016 20:45:52 GMT",
"version": "v1"
}
] |
2016-12-06
|
[
[
"Chouika",
"N.",
""
],
[
"Mezrag",
"C.",
""
],
[
"Moutarde",
"H.",
""
],
[
"Rodríguez-Quintero",
"J.",
""
]
] |
We briefly report on a recent computation, with the help of a fruitful algebraic model, sketching the pion valence dressed-quark generalized parton distribution. Then, preliminary, we introduce on a sensible procedure to get reliable results in both Dokshitzer-Gribov-Lipatov-Altarelli-Parisi (DGLAP) and Efremov-Radyushkin-Brodsky-Lepage (ERBL) kinematical regions, grounded on the GPD overlap representation and its parametrization of a Radon transform of the so-called double distribution (DD).
|
hep-ph/0702126
|
Yongseok Oh
|
Yongseok Oh
|
Xi and Omega baryons in the Skyrme model
|
17 pages, REVTeX, to be published in Phys. Rev. D
|
Phys.Rev.D75:074002,2007
|
10.1103/PhysRevD.75.074002
| null |
hep-ph hep-ex nucl-th
| null |
The mass spectrum and magnetic moments of \Xi and \Omega baryon resonances
are investigated in the bound state approach of the Skyrme model. The empirical
hyperon spectrum shows that several hyperon resonances share a pattern of
(approximately) equal mass spacings between the states of same spin but of
opposite parity. It is found that this pattern can be explained mostly by the
energy difference between the P-wave and S-wave kaons bound to the soliton.
Although one cannot exclude the possibility that these states can be described
as pion-hyperon resonances, the present approach predicts that \Xi(1620) and
\Xi(1690) have J^P = 12^-, while \Xi(1950) has J^P = 12^+. The differences with
the quark model predictions for the \Xi and \Omega baryon spectrum are pointed
out. Several relations for the masses and magnetic moments of those resonances
are also obtained.
|
[
{
"created": "Tue, 13 Feb 2007 05:03:48 GMT",
"version": "v1"
},
{
"created": "Tue, 13 Feb 2007 21:09:10 GMT",
"version": "v2"
},
{
"created": "Thu, 15 Feb 2007 15:37:54 GMT",
"version": "v3"
},
{
"created": "Tue, 13 Mar 2007 20:29:44 GMT",
"version": "v4"
}
] |
2008-11-26
|
[
[
"Oh",
"Yongseok",
""
]
] |
The mass spectrum and magnetic moments of \Xi and \Omega baryon resonances are investigated in the bound state approach of the Skyrme model. The empirical hyperon spectrum shows that several hyperon resonances share a pattern of (approximately) equal mass spacings between the states of same spin but of opposite parity. It is found that this pattern can be explained mostly by the energy difference between the P-wave and S-wave kaons bound to the soliton. Although one cannot exclude the possibility that these states can be described as pion-hyperon resonances, the present approach predicts that \Xi(1620) and \Xi(1690) have J^P = 12^-, while \Xi(1950) has J^P = 12^+. The differences with the quark model predictions for the \Xi and \Omega baryon spectrum are pointed out. Several relations for the masses and magnetic moments of those resonances are also obtained.
|
1808.09292
|
Satyajit Seth
|
R. Keith Ellis and Satyajit Seth
|
On Higgs boson plus gluon amplitudes at one loop
|
15 pages, 3 Feynman diagrams
| null |
10.1007/JHEP11(2018)006
|
IPPP/18/73
|
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We present analytic results for one-loop Higgs boson + $n$-gluon amplitudes
for $n\le 5$ in the full theory including all dependence on the (top) quark
mass. In this paper we consider only the case where the gluons all have the
same helicity. The amplitudes are expressed in simple formula and display
similar structure. Their limiting behaviour in small Higgs momentum and large
top mass is studied.
|
[
{
"created": "Tue, 28 Aug 2018 13:47:19 GMT",
"version": "v1"
}
] |
2018-11-14
|
[
[
"Ellis",
"R. Keith",
""
],
[
"Seth",
"Satyajit",
""
]
] |
We present analytic results for one-loop Higgs boson + $n$-gluon amplitudes for $n\le 5$ in the full theory including all dependence on the (top) quark mass. In this paper we consider only the case where the gluons all have the same helicity. The amplitudes are expressed in simple formula and display similar structure. Their limiting behaviour in small Higgs momentum and large top mass is studied.
|
hep-ph/9809296
|
Carsten Greiner
|
Carsten Greiner and Stefan Leupold
|
Stochastic interpretation of Kadanoff-Baym equations
|
10 pages reftex, 2 eps-figures, Talk presented at the 5th
International Workshop on Thermal Field Theories and their Applications,
Regensburg, Germany, August 1998, added discussion and references
| null | null |
UGI-98-27
|
hep-ph
| null |
We show that the nonperturbative transport equations, the so called
`Kadanoff-Baym equations', within the non-equilibrium real time Green's
function description can be be understood as the ensemble average over
stochastic equations of Langevin type. For this we couple a free scalar boson
quantum field to an environmental heat bath with some given temperature T. The
inherent presence of noise and dissipation related by the
fluctuation-dissipation theorem guarantees that the modes or particles become
thermally populated on average in the long-time limit. This interpretation
leads to a more intuitive physical picture of the process of thermalization and
of the interpretation of the Kadanoff-Baym equations. One also immediately
understands that the emerging wave equations for long wavelength modes with
momenta much smaller than temperature behave nearly as classical fields. We
also demonstrate how the problem of so called pinch singularities is resolved
by a clear physical necessity of damping within the one-particle propagator.
The occurrence of such ill-defined terms arising solely in a strictly
perturbative expansion in out of equilibrium quantum field theory has a natural
interpretation in analogy to Fermi's golden rule.
|
[
{
"created": "Tue, 8 Sep 1998 08:34:14 GMT",
"version": "v1"
},
{
"created": "Mon, 30 Nov 1998 18:07:33 GMT",
"version": "v2"
}
] |
2007-05-23
|
[
[
"Greiner",
"Carsten",
""
],
[
"Leupold",
"Stefan",
""
]
] |
We show that the nonperturbative transport equations, the so called `Kadanoff-Baym equations', within the non-equilibrium real time Green's function description can be be understood as the ensemble average over stochastic equations of Langevin type. For this we couple a free scalar boson quantum field to an environmental heat bath with some given temperature T. The inherent presence of noise and dissipation related by the fluctuation-dissipation theorem guarantees that the modes or particles become thermally populated on average in the long-time limit. This interpretation leads to a more intuitive physical picture of the process of thermalization and of the interpretation of the Kadanoff-Baym equations. One also immediately understands that the emerging wave equations for long wavelength modes with momenta much smaller than temperature behave nearly as classical fields. We also demonstrate how the problem of so called pinch singularities is resolved by a clear physical necessity of damping within the one-particle propagator. The occurrence of such ill-defined terms arising solely in a strictly perturbative expansion in out of equilibrium quantum field theory has a natural interpretation in analogy to Fermi's golden rule.
|
2307.02521
|
Wouter Waalewijn
|
Pim Bijl, Steven Niedenzu, Wouter J. Waalewijn
|
Probing factorization violation with vector angularities
|
8 pages, 2 figures, v2: journal version
| null | null | null |
hep-ph nucl-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Factorization underlies all predictions at the Large Hadron Collider, but has
only been rigorously proven in a few cases. One of these cases is the Drell-Yan
process, $pp \to Z/\gamma + X$, in the limit of small boson transverse
momentum. We introduce a one-parameter family of observables, that we call
vector angularities, of which the transverse momentum is a special case. This
enables the study of factorization violation, with a smooth transition to the
limit for which factorization has been established. Like the angularity event
shapes, vector angularities are a sum of transverse momenta weighted by
rapidity, but crucially this is a vector sum rather than a sum of the magnitude
of transverse momenta. We study these observables in Pythia, using the effect
of multi-parton interactions (MPI) as a proxy factorization violation, finding
a negligible effect in the case where factorization is established but sizable
effects away from it. We also present a factorization formula for the cross
section, that does not include factorization violating contributions from
Glauber gluons, and thus offers a baseline for studying factorization violation
experimentally using vector angularities. Our predictions at next-to-leading
logarithmic accuracy (NLL$'$) are in good in agreement with Pythia (not
including MPI), and can be extended to higher order.
|
[
{
"created": "Wed, 5 Jul 2023 18:00:00 GMT",
"version": "v1"
},
{
"created": "Mon, 8 Jan 2024 15:43:34 GMT",
"version": "v2"
}
] |
2024-01-09
|
[
[
"Bijl",
"Pim",
""
],
[
"Niedenzu",
"Steven",
""
],
[
"Waalewijn",
"Wouter J.",
""
]
] |
Factorization underlies all predictions at the Large Hadron Collider, but has only been rigorously proven in a few cases. One of these cases is the Drell-Yan process, $pp \to Z/\gamma + X$, in the limit of small boson transverse momentum. We introduce a one-parameter family of observables, that we call vector angularities, of which the transverse momentum is a special case. This enables the study of factorization violation, with a smooth transition to the limit for which factorization has been established. Like the angularity event shapes, vector angularities are a sum of transverse momenta weighted by rapidity, but crucially this is a vector sum rather than a sum of the magnitude of transverse momenta. We study these observables in Pythia, using the effect of multi-parton interactions (MPI) as a proxy factorization violation, finding a negligible effect in the case where factorization is established but sizable effects away from it. We also present a factorization formula for the cross section, that does not include factorization violating contributions from Glauber gluons, and thus offers a baseline for studying factorization violation experimentally using vector angularities. Our predictions at next-to-leading logarithmic accuracy (NLL$'$) are in good in agreement with Pythia (not including MPI), and can be extended to higher order.
|
1203.3625
|
Evangelos Matsinos
|
Evangelos Matsinos, Guenther Rasche
|
Analysis of the low-energy $\pi^\pm p$ elastic-scattering data
|
J. Mod. Phys. 3 (2012) 1369-87
| null |
10.4236/jmp.2012.310174
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We report the results of a phase-shift analysis (PSA) of the low-energy
$\pi^\pm p$ elastic-scattering data. Following the method which we had set
forth in our previous PSA (Matsinos et al., 2006), we first investigate the
self-consistency of the low-energy $\pi^\pm p$ elastic-scattering databases,
via two separate analyses of (first) the $\pi^+ p$ and (subsequently) the
$\pi^- p$ elastic-scattering data. There are two main differences to our
previous PSA: a) we now perform only one test for the acceptance of each data
set (based on its contribution to the overall $\chi^2$) and b) we adopt a more
stringent acceptance criterion in the statistical tests. We show that it is
possible to obtain self-consistent databases after removing a very small amount
of the data (4.57% of the initial database). We subsequently fit the ETH model
(Goudsmit et al. 1994) to the truncated $\pi^\pm p$ elastic-scattering
databases. The model-parameter values show reasonable stability when subjected
to different criteria for the rejection of single data points and entire data
sets. Our result for the pseudovector $\pi N N$ coupling constant is $0.0726
\pm 0.0014$. We extract the scattering lengths and volumes, as well as the s-
and p-wave hadronic phase shifts up to T=100 MeV. Large differences in the
s-wave part of the interaction can be seen when comparing our hadronic phase
shifts with the current SAID solution (WI08); there is general agreement in the
p waves, save for the $\tilde{\delta}_{1-}^{1/2}$ hadronic phase shift.
|
[
{
"created": "Fri, 16 Mar 2012 07:25:26 GMT",
"version": "v1"
},
{
"created": "Fri, 3 Aug 2012 15:47:30 GMT",
"version": "v2"
},
{
"created": "Wed, 31 Oct 2012 16:20:20 GMT",
"version": "v3"
}
] |
2015-06-04
|
[
[
"Matsinos",
"Evangelos",
""
],
[
"Rasche",
"Guenther",
""
]
] |
We report the results of a phase-shift analysis (PSA) of the low-energy $\pi^\pm p$ elastic-scattering data. Following the method which we had set forth in our previous PSA (Matsinos et al., 2006), we first investigate the self-consistency of the low-energy $\pi^\pm p$ elastic-scattering databases, via two separate analyses of (first) the $\pi^+ p$ and (subsequently) the $\pi^- p$ elastic-scattering data. There are two main differences to our previous PSA: a) we now perform only one test for the acceptance of each data set (based on its contribution to the overall $\chi^2$) and b) we adopt a more stringent acceptance criterion in the statistical tests. We show that it is possible to obtain self-consistent databases after removing a very small amount of the data (4.57% of the initial database). We subsequently fit the ETH model (Goudsmit et al. 1994) to the truncated $\pi^\pm p$ elastic-scattering databases. The model-parameter values show reasonable stability when subjected to different criteria for the rejection of single data points and entire data sets. Our result for the pseudovector $\pi N N$ coupling constant is $0.0726 \pm 0.0014$. We extract the scattering lengths and volumes, as well as the s- and p-wave hadronic phase shifts up to T=100 MeV. Large differences in the s-wave part of the interaction can be seen when comparing our hadronic phase shifts with the current SAID solution (WI08); there is general agreement in the p waves, save for the $\tilde{\delta}_{1-}^{1/2}$ hadronic phase shift.
|
2310.09640
|
Suvam Maharana
|
Suvam Maharana and Tripurari Srivastava
|
Clockwork Neutrinogenesis: Baryogenesis from theory space
|
6 pages, 3 figures
| null | null | null |
hep-ph hep-th
|
http://creativecommons.org/licenses/by/4.0/
|
We propose a minimal clockwork model to illustrate the possibility of
baryogenesis via leptogenesis in a theory space setting. The standard lepton
sector is augmented with three copies of a clockwork lattice made of SM neutral
fermions. The two boundaries of these one-dimensional lattices are endowed with
couplings to the SM leptons and three dark sector fermions, respectively. Small
neutrino masses and a resonance enhanced Dirac leptogenesis are naturally
obtained for anarchic textures of the Yukawa matrices, with $\sim O(1)$
elements, provided the heavy clockwork fermions have masses $\gtrsim O(10 \,
\mbox{TeV})$.
|
[
{
"created": "Sat, 14 Oct 2023 18:44:05 GMT",
"version": "v1"
}
] |
2023-10-17
|
[
[
"Maharana",
"Suvam",
""
],
[
"Srivastava",
"Tripurari",
""
]
] |
We propose a minimal clockwork model to illustrate the possibility of baryogenesis via leptogenesis in a theory space setting. The standard lepton sector is augmented with three copies of a clockwork lattice made of SM neutral fermions. The two boundaries of these one-dimensional lattices are endowed with couplings to the SM leptons and three dark sector fermions, respectively. Small neutrino masses and a resonance enhanced Dirac leptogenesis are naturally obtained for anarchic textures of the Yukawa matrices, with $\sim O(1)$ elements, provided the heavy clockwork fermions have masses $\gtrsim O(10 \, \mbox{TeV})$.
|
hep-ph/9612435
|
Johannes Bluemlein
|
D. Bardin, J. Bl\"umlein, P. Christova, and L. Kalinovskaya
|
$O(\alpha)$ QED Corrections to Neutral Current Polarized Deep-Inelastic
Lepton-Nucleon Scattering
|
36 pages Latex, including 3 ps-figures and 8 eps figures
|
Nucl.Phys. B506 (1997) 295-328
|
10.1016/S0550-3213(97)00505-1
|
DESY 96-189
|
hep-ph
| null |
The $O(\alpha)$ leptonic QED corrections to neutral current polarized deep
inelastic lepton-nucleon scattering are calculated in leptonic variables both
for the case of longitudinal and transverse nucleon polarization. The results
of the complete calculation are compared with the corresponding leading log
expressions. Numerical results are presented for the corrections in the
kinematic range of the HERMES experiment and possible future polarized proton
beam experiments at HERA.
|
[
{
"created": "Fri, 20 Dec 1996 18:47:27 GMT",
"version": "v1"
}
] |
2009-10-30
|
[
[
"Bardin",
"D.",
""
],
[
"Blümlein",
"J.",
""
],
[
"Christova",
"P.",
""
],
[
"Kalinovskaya",
"L.",
""
]
] |
The $O(\alpha)$ leptonic QED corrections to neutral current polarized deep inelastic lepton-nucleon scattering are calculated in leptonic variables both for the case of longitudinal and transverse nucleon polarization. The results of the complete calculation are compared with the corresponding leading log expressions. Numerical results are presented for the corrections in the kinematic range of the HERMES experiment and possible future polarized proton beam experiments at HERA.
|
2109.03259
|
Basabendu Barman
|
Basabendu Barman, Anish Ghoshal
|
Scale Invariant FIMP Miracle
|
39 pages, 7 figures, comments are welcome; typos fixed, one new
figure added, new references added, abstract slightly changed, conclusion
unchanged. Version accepted for publication in JCAP
| null |
10.1088/1475-7516/2022/03/003
|
PI/UAN-2021-698FT
|
hep-ph hep-ex
|
http://creativecommons.org/licenses/by/4.0/
|
We study the freeze-in production of vector dark matter (DM) in a classically
scale invariant theory, where the Standard Model (SM) is augmented with an
abelian $U(1)_X$ gauge symmetry that is spontaneously broken due to the
non-zero vacuum expectation value (VEV) of a scalar charged under the $U(1)_X$.
Generating the SM Higgs mass at 1-loop level, it leaves only two parameters in
the dark sector, namely, the DM mass $m_X$ and the gauge coupling $g_X$ as
independent, and supplement with a naturally light dark scalar particle. We
show, for $g_X\sim\mathcal{O}\left(10^{-5}\right)$, it is possible to produce
the DM X out-of-equilibrium in the early Universe, satisfying the observed
relic abundance for $m_X\sim\mathcal{O}\left(\text{TeV}\right)$, which in turn
also determines the scalar mixing angle $\sin
\theta\sim\mathcal{O}\left(10^{-5}\right)$. The presence of such naturally
light scalar mediator with tiny mixing with the SM, opens up the possibility
for the model to be explored in direct search experiment, which otherwise is
insensitive to standard freeze-in scenarios. Moreover we show that even with
such feeble couplings, necessary for the DM freeze-in, the scenario is testable
in several light dark sector searches (e.g., in DUNE and in FASER-II),
satisfying constraints from the observed relic abundance as well as big bang
nucleosynthesis (BBN). Particularly, we find, regions of the parameter space
with $m_X$ $\gtrsim 1.8$ TeV are insensitive to direct detection probes but
still can become accessible in lifetime frontier searches, courtesy to the
underlying scale invariance of the theory.
|
[
{
"created": "Tue, 7 Sep 2021 18:01:01 GMT",
"version": "v1"
},
{
"created": "Wed, 15 Sep 2021 15:59:20 GMT",
"version": "v2"
},
{
"created": "Sat, 29 Jan 2022 12:49:21 GMT",
"version": "v3"
}
] |
2022-03-09
|
[
[
"Barman",
"Basabendu",
""
],
[
"Ghoshal",
"Anish",
""
]
] |
We study the freeze-in production of vector dark matter (DM) in a classically scale invariant theory, where the Standard Model (SM) is augmented with an abelian $U(1)_X$ gauge symmetry that is spontaneously broken due to the non-zero vacuum expectation value (VEV) of a scalar charged under the $U(1)_X$. Generating the SM Higgs mass at 1-loop level, it leaves only two parameters in the dark sector, namely, the DM mass $m_X$ and the gauge coupling $g_X$ as independent, and supplement with a naturally light dark scalar particle. We show, for $g_X\sim\mathcal{O}\left(10^{-5}\right)$, it is possible to produce the DM X out-of-equilibrium in the early Universe, satisfying the observed relic abundance for $m_X\sim\mathcal{O}\left(\text{TeV}\right)$, which in turn also determines the scalar mixing angle $\sin \theta\sim\mathcal{O}\left(10^{-5}\right)$. The presence of such naturally light scalar mediator with tiny mixing with the SM, opens up the possibility for the model to be explored in direct search experiment, which otherwise is insensitive to standard freeze-in scenarios. Moreover we show that even with such feeble couplings, necessary for the DM freeze-in, the scenario is testable in several light dark sector searches (e.g., in DUNE and in FASER-II), satisfying constraints from the observed relic abundance as well as big bang nucleosynthesis (BBN). Particularly, we find, regions of the parameter space with $m_X$ $\gtrsim 1.8$ TeV are insensitive to direct detection probes but still can become accessible in lifetime frontier searches, courtesy to the underlying scale invariance of the theory.
|
1411.0131
|
Sichun Sun
|
Sichun Sun
|
Little Flavor: Heavy Leptons, Z' and Higgs Phenomenology
|
11 pages, 3 figures. V2 added references, lepton mixing matrix
non-unitarity and muon magnetic moment constraints discussion. Minor words
improvement. V3 added UpToDate remarks on emergent UV completion, LHC13
phenomenology and extensive references
| null | null | null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
The Little Flavor model is a close cousin of the Little Higgs theory which
aims to generate flavor structure around TeV scale. While the original Little
Flavor only included the quark sector, here we build the lepton part of the
Little Flavor model and explore its phenomenology. The model produces the
neutrino mixing matrix and Majorana masses of the Standard Model neutrinos
through coupling to heavy lepton partners and Little Higgses. We combine the
usual right-handed seesaw mechanism with global symmetry protection to suppress
the Standard Model neutrino masses, and identify the TeV partners of leptons as
right-handed Majorana neutrinos. The lepton masses and mixing matrix are
calculated perturbatively in the theory.
The TeV new gauge bosons have suppressed decay width in dilepton channels.
Even assuming the Standard Model couplings, the branching ratios to normal
dilepton channels are largely reduced in the model, to evade the bound from
current $Z'$ search. It also opens up the new search channels for exotic gauge
bosons, especially Z' -> MET + multi L+jets. The multiple lepton partners will
create new chain decay signals in flavor related processes in colliders, which
also give rise to flavor anomalies. The lepton flavor violation process can be
highly suppressed in charged lepton sector and happens only through neutrinos.
|
[
{
"created": "Sat, 1 Nov 2014 16:01:06 GMT",
"version": "v1"
},
{
"created": "Mon, 1 Dec 2014 09:44:33 GMT",
"version": "v2"
},
{
"created": "Fri, 22 Jan 2016 16:49:34 GMT",
"version": "v3"
}
] |
2016-01-25
|
[
[
"Sun",
"Sichun",
""
]
] |
The Little Flavor model is a close cousin of the Little Higgs theory which aims to generate flavor structure around TeV scale. While the original Little Flavor only included the quark sector, here we build the lepton part of the Little Flavor model and explore its phenomenology. The model produces the neutrino mixing matrix and Majorana masses of the Standard Model neutrinos through coupling to heavy lepton partners and Little Higgses. We combine the usual right-handed seesaw mechanism with global symmetry protection to suppress the Standard Model neutrino masses, and identify the TeV partners of leptons as right-handed Majorana neutrinos. The lepton masses and mixing matrix are calculated perturbatively in the theory. The TeV new gauge bosons have suppressed decay width in dilepton channels. Even assuming the Standard Model couplings, the branching ratios to normal dilepton channels are largely reduced in the model, to evade the bound from current $Z'$ search. It also opens up the new search channels for exotic gauge bosons, especially Z' -> MET + multi L+jets. The multiple lepton partners will create new chain decay signals in flavor related processes in colliders, which also give rise to flavor anomalies. The lepton flavor violation process can be highly suppressed in charged lepton sector and happens only through neutrinos.
|
1608.03564
|
Gerhard Buchalla
|
G. Buchalla, O. Cata, A. Celis, C. Krause
|
Standard Model Extended by a Heavy Singlet: Linear vs. Nonlinear EFT
|
29 pages, 5 figures
| null |
10.1016/j.nuclphysb.2017.02.006
|
LMU-ASC 35/16
|
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We consider the Standard Model extended by a heavy scalar singlet in
different regions of parameter space and construct the appropriate low-energy
effective field theories up to first nontrivial order. This top-down exercise
in effective field theory is meant primarily to illustrate with a simple
example the systematics of the linear and nonlinear electroweak effective
Lagrangians and to clarify the relation between them. We discuss power-counting
aspects and the transition between both effective theories on the basis of the
model, confirming in all cases the rules and procedures derived in previous
works from a bottom-up approach.
|
[
{
"created": "Thu, 11 Aug 2016 18:41:04 GMT",
"version": "v1"
}
] |
2017-04-05
|
[
[
"Buchalla",
"G.",
""
],
[
"Cata",
"O.",
""
],
[
"Celis",
"A.",
""
],
[
"Krause",
"C.",
""
]
] |
We consider the Standard Model extended by a heavy scalar singlet in different regions of parameter space and construct the appropriate low-energy effective field theories up to first nontrivial order. This top-down exercise in effective field theory is meant primarily to illustrate with a simple example the systematics of the linear and nonlinear electroweak effective Lagrangians and to clarify the relation between them. We discuss power-counting aspects and the transition between both effective theories on the basis of the model, confirming in all cases the rules and procedures derived in previous works from a bottom-up approach.
|
2204.09256
|
Zhiqing Zhang
|
Zhiqing Zhang
|
Dispersive approach to HVP for muon g-2
|
4 pages, 1 figure, 1 table, contribution to the 2022 QCD session of
the 56th Rencontres de Moriond
| null | null | null |
hep-ph hep-ex
|
http://creativecommons.org/licenses/by/4.0/
|
The dispersive approaches to the hadronic vacuum polarisation contributions
to the muon anomalous magnetic moment $a_\mu$ are described. The main issues
are discussed followed by perspectives in the next years.
|
[
{
"created": "Wed, 20 Apr 2022 06:46:59 GMT",
"version": "v1"
}
] |
2022-04-21
|
[
[
"Zhang",
"Zhiqing",
""
]
] |
The dispersive approaches to the hadronic vacuum polarisation contributions to the muon anomalous magnetic moment $a_\mu$ are described. The main issues are discussed followed by perspectives in the next years.
|
hep-ph/9910444
|
Steen H. Hansen
|
A.D. Dolgov, S.H. Hansen, S. Pastor, and D.V. Semikoz
|
Neutrino oscillations in the early universe: How large lepton asymmetry
can be generated?
|
25 pages, LaTeX (5 graphs)
|
Astropart.Phys.14:79-90,2000
|
10.1016/S0927-6505(00)00111-0
|
TAC-1999-018, SISSA 124/99/EP
|
hep-ph
| null |
The lepton asymmetry that could be generated in the early universe through
oscillations of active to sterile neutrinos is calculated (almost) analytically
for small mixing angles, sin 2\theta < 10^{-2}. It is shown that for a mass
squared difference, \delta m^2=-1 eV^2 it may rise at most by 6 orders of
magnitude from the initial ``normal'' value of 10^{-10}, since the
back-reaction from the refraction index terminates this rise while the
asymmetry is still small. Only for very large mass differences, \delta m^2
about 10^9 eV^2, the lepton asymmetry could reach a significant magnitude
exceeding 0.1.
|
[
{
"created": "Fri, 22 Oct 1999 11:39:00 GMT",
"version": "v1"
}
] |
2011-05-23
|
[
[
"Dolgov",
"A. D.",
""
],
[
"Hansen",
"S. H.",
""
],
[
"Pastor",
"S.",
""
],
[
"Semikoz",
"D. V.",
""
]
] |
The lepton asymmetry that could be generated in the early universe through oscillations of active to sterile neutrinos is calculated (almost) analytically for small mixing angles, sin 2\theta < 10^{-2}. It is shown that for a mass squared difference, \delta m^2=-1 eV^2 it may rise at most by 6 orders of magnitude from the initial ``normal'' value of 10^{-10}, since the back-reaction from the refraction index terminates this rise while the asymmetry is still small. Only for very large mass differences, \delta m^2 about 10^9 eV^2, the lepton asymmetry could reach a significant magnitude exceeding 0.1.
|
hep-ph/9811314
|
Thomas K. Gaisser
|
Thomas K. Gaisser (Bartol Research Institute)
|
Primary Cosmic-ray Spectrum and the Intensity of Atmospheric Neutrinos
|
7 pages, LaTeX, 1 figure, talk given at the Symposium "New Era in
Neutrino Physics", Tokyo Metropolitan University, Japan, 11-12 June, 1998
| null | null |
BA-98-52
|
hep-ph
| null |
Measurements of the intensity of primary cosmic-ray protons reported in the
last two years suggest a lower normalization than some earlier measurements.
Here we comment on the measurements, compare them to assumptions made in two
independent calculations of atmospheric neutrinos and discuss the possible
consequences for interpretation of measurements of atmospheric neutrinos.
|
[
{
"created": "Thu, 12 Nov 1998 16:00:08 GMT",
"version": "v1"
}
] |
2007-05-23
|
[
[
"Gaisser",
"Thomas K.",
"",
"Bartol Research Institute"
]
] |
Measurements of the intensity of primary cosmic-ray protons reported in the last two years suggest a lower normalization than some earlier measurements. Here we comment on the measurements, compare them to assumptions made in two independent calculations of atmospheric neutrinos and discuss the possible consequences for interpretation of measurements of atmospheric neutrinos.
|
hep-ph/9410412
|
Apostolos Pilaftsis
|
Apostolos Pilaftsis
|
Heavy-Neutrino Effects on tau-Lepton Decays
|
14 pages (1 Figure), based on a contribution submitted to ichep94,
LaTeX, RAL/94-113
|
Mod.Phys.Lett.A9:3595-3604,1994
|
10.1142/S0217732394003439
| null |
hep-ph
| null |
Minimal extensions of the Standard Model that are motivated by grand unified
theories or superstring models with an E_6 symmetry can naturally predict heavy
neutrinos of Dirac or Majorana nature. Such heavy neutral leptons violate the
de- coupling theorem at the one-loop electroweak order and hence offer a unique
chance for possible lepton-flavour decays of the tau lepton, e.g. tau -> eee or
tau -> mu mu mu, to be seen in LEP experiments. We analyze such decays in
models with three and four generations.
|
[
{
"created": "Mon, 31 Oct 1994 11:03:39 GMT",
"version": "v1"
}
] |
2011-04-15
|
[
[
"Pilaftsis",
"Apostolos",
""
]
] |
Minimal extensions of the Standard Model that are motivated by grand unified theories or superstring models with an E_6 symmetry can naturally predict heavy neutrinos of Dirac or Majorana nature. Such heavy neutral leptons violate the de- coupling theorem at the one-loop electroweak order and hence offer a unique chance for possible lepton-flavour decays of the tau lepton, e.g. tau -> eee or tau -> mu mu mu, to be seen in LEP experiments. We analyze such decays in models with three and four generations.
|
hep-ph/9908201
|
S. Y. Tsai
|
Y. Kouchi, Y. Takeuchi and S. Y. Tsai
|
More on Parametrization Relevant to Describe Violation of CP, T and CPT
Symmetries in the $K^0-\bar{K^0}$ System
| null | null | null |
NUP-A-99-14
|
hep-ph
| null |
To study violation of CP, T and/or CPT symmetries in the $K^0-\bar{K^0}$
systems, one has to parametrize the relevant mixing parameters and decay
amplitudes in such a way that each parameter represents violation of these
symmetries in a well-defined way. Parametrization is of course not unique and
is always subject to phase ambiguities. We discuss these problems with freedom
associated with rephasing of final (or intermediate) as well as initial states
taken into account. We present a fully rephasing-invariant parametrization and
a particular rephasing-dependent parametrization, and give a couple of comments
related to these and other possible parametrizations.
|
[
{
"created": "Sat, 31 Jul 1999 03:43:20 GMT",
"version": "v1"
}
] |
2007-05-23
|
[
[
"Kouchi",
"Y.",
""
],
[
"Takeuchi",
"Y.",
""
],
[
"Tsai",
"S. Y.",
""
]
] |
To study violation of CP, T and/or CPT symmetries in the $K^0-\bar{K^0}$ systems, one has to parametrize the relevant mixing parameters and decay amplitudes in such a way that each parameter represents violation of these symmetries in a well-defined way. Parametrization is of course not unique and is always subject to phase ambiguities. We discuss these problems with freedom associated with rephasing of final (or intermediate) as well as initial states taken into account. We present a fully rephasing-invariant parametrization and a particular rephasing-dependent parametrization, and give a couple of comments related to these and other possible parametrizations.
|
hep-ph/0703243
|
Carsten van de Bruck
|
Ph. Brax, C. van de Bruck and A.-C. Davis
|
Compatibility of the chameleon-field model with fifth-force experiments,
cosmology, and PVLAS and CAST results
|
4 pages, title change, comments added, version to appear in Physical
Review Letters
|
Phys.Rev.Lett.99:121103,2007
|
10.1103/PhysRevLett.99.121103
| null |
hep-ph astro-ph hep-th
| null |
We analyse the PVLAS results using a chameleon field whose properties depend
on the environment. We find that, assuming a runaway bare potential $V(\phi)$
and a universal coupling to matter, the chameleon potential is such that the
scalar field can act as dark energy. Moreover the chameleon field model is
compatible with the CAST results, fifth force experiments and cosmology.
|
[
{
"created": "Thu, 22 Mar 2007 16:46:02 GMT",
"version": "v1"
},
{
"created": "Fri, 31 Aug 2007 13:09:57 GMT",
"version": "v2"
}
] |
2008-11-26
|
[
[
"Brax",
"Ph.",
""
],
[
"van de Bruck",
"C.",
""
],
[
"Davis",
"A. -C.",
""
]
] |
We analyse the PVLAS results using a chameleon field whose properties depend on the environment. We find that, assuming a runaway bare potential $V(\phi)$ and a universal coupling to matter, the chameleon potential is such that the scalar field can act as dark energy. Moreover the chameleon field model is compatible with the CAST results, fifth force experiments and cosmology.
|
hep-ph/0405277
|
Etele Molnar
|
L.P. Csernai, A. Anderlik, Cs. Anderlik, V.K. Magas, E. Molnar, A.
Nyiri, D. R\"ohrich and K. Tamosiunas
|
The 3rd Flow Component as a QGP Signal
| null |
Acta Phys.Hung. A22 (2005) 181-186
|
10.1556/APH.22.2005.3-4.2
| null |
hep-ph
| null |
Earlier fluid dynamical calculations with QGP show a softening of the
directed flow while with hadronic matter this effect is absent. On the other
hand, we indicated that a third flow component shows up in the reaction plane
as an enhanced emission, which is orthogonal to the directed flow. This is not
shadowed by the deflected projectile and target, and shows up at measurable
rapidities, $y_cm = 1-2$. To study the formation of this effect initial stages
of relativistic heavy ion collisions are studied. An effective string rope
model is presented for heavy ion collisions at RHIC energies. Our model takes
into account baryon recoil for both target and projectile, arising from the
acceleration of partons in an effective field. The typical field strength
(string tension) for RHIC energies is about 5-12 GeV/fm, what allows us to talk
about "string ropes". The results show that QGP forms a tilted disk, such that
the direction of the largest pressure gradient stays in the reaction plane, but
deviates from both the beam and the usual transverse flow directions. The
produced initial state can be used as an initial condition for further
hydrodynamical calculations. Such initial conditions lead to the creation of
third flow component. Recent $v_1$ measurements are promising that this effect
can be used as a diagnostic tool of the QGP.
|
[
{
"created": "Thu, 27 May 2004 18:34:17 GMT",
"version": "v1"
}
] |
2009-11-10
|
[
[
"Csernai",
"L. P.",
""
],
[
"Anderlik",
"A.",
""
],
[
"Anderlik",
"Cs.",
""
],
[
"Magas",
"V. K.",
""
],
[
"Molnar",
"E.",
""
],
[
"Nyiri",
"A.",
""
],
[
"Röhrich",
"D.",
""
],
[
"Tamosiunas",
"K.",
""
]
] |
Earlier fluid dynamical calculations with QGP show a softening of the directed flow while with hadronic matter this effect is absent. On the other hand, we indicated that a third flow component shows up in the reaction plane as an enhanced emission, which is orthogonal to the directed flow. This is not shadowed by the deflected projectile and target, and shows up at measurable rapidities, $y_cm = 1-2$. To study the formation of this effect initial stages of relativistic heavy ion collisions are studied. An effective string rope model is presented for heavy ion collisions at RHIC energies. Our model takes into account baryon recoil for both target and projectile, arising from the acceleration of partons in an effective field. The typical field strength (string tension) for RHIC energies is about 5-12 GeV/fm, what allows us to talk about "string ropes". The results show that QGP forms a tilted disk, such that the direction of the largest pressure gradient stays in the reaction plane, but deviates from both the beam and the usual transverse flow directions. The produced initial state can be used as an initial condition for further hydrodynamical calculations. Such initial conditions lead to the creation of third flow component. Recent $v_1$ measurements are promising that this effect can be used as a diagnostic tool of the QGP.
|
1501.00543
|
Thuy Nguyen Thi
|
D. T. Huong, P. V. Dong, C. S. Kim, N. T. Thuy
|
Inflation and leptogenesis in the 3-3-1-1 model
|
31 pages, 9 figures
|
Phys. Rev. D 91, 055023 (2015)
|
10.1103/PhysRevD.91.055023
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We consider the SU(3)_C \otimes SU(3)_L \otimes U(1)_X \otimes U(1)_N
(3-3-1-1) model at the GUT scale with implication for inflation and
leptogenesis. The mass spectra of the neutral Higgs bosons and neutral gauge
bosons are reconsidered when the scale of the 3-3-1-1 breaking is much larger
than that of the ordinary SU(3)_C \otimes SU(3)_L \otimes U(1)_X (3-3-1)
breaking. We investigate how the 3-3-1-1 model generates an inflation by
identifying the scalar field that spontaneously breaks the U(1)_N symmetry to
inflaton as well as including radiative corrections for the inflaton potential.
We figure out the parameter spaces appeared in the inflaton potential that
satisfy the conditions for an inflation model and obtain the inflaton mass an
order of 10^{13} GeV. The inflaton can dominantly decay into a pair of light
Higgs bosons or a pair of heavy Majorana neutrinos which lead, respectively, to
a reheating temperature of 10^9 GeV order appropriate to a thermal leptogenesis
scenario or to a reduced reheating temperature corresponding to a non-thermal
leptogenesis scenario. We calculate the lepton asymmetry which yields baryon
asymmetry successfully for both the thermal and non-thermal cases.
|
[
{
"created": "Sat, 3 Jan 2015 08:59:23 GMT",
"version": "v1"
}
] |
2015-03-24
|
[
[
"Huong",
"D. T.",
""
],
[
"Dong",
"P. V.",
""
],
[
"Kim",
"C. S.",
""
],
[
"Thuy",
"N. T.",
""
]
] |
We consider the SU(3)_C \otimes SU(3)_L \otimes U(1)_X \otimes U(1)_N (3-3-1-1) model at the GUT scale with implication for inflation and leptogenesis. The mass spectra of the neutral Higgs bosons and neutral gauge bosons are reconsidered when the scale of the 3-3-1-1 breaking is much larger than that of the ordinary SU(3)_C \otimes SU(3)_L \otimes U(1)_X (3-3-1) breaking. We investigate how the 3-3-1-1 model generates an inflation by identifying the scalar field that spontaneously breaks the U(1)_N symmetry to inflaton as well as including radiative corrections for the inflaton potential. We figure out the parameter spaces appeared in the inflaton potential that satisfy the conditions for an inflation model and obtain the inflaton mass an order of 10^{13} GeV. The inflaton can dominantly decay into a pair of light Higgs bosons or a pair of heavy Majorana neutrinos which lead, respectively, to a reheating temperature of 10^9 GeV order appropriate to a thermal leptogenesis scenario or to a reduced reheating temperature corresponding to a non-thermal leptogenesis scenario. We calculate the lepton asymmetry which yields baryon asymmetry successfully for both the thermal and non-thermal cases.
|
hep-ph/0406192
|
David London
|
Alakabha Datta, Maxime Imbeault, David London, Veronique Page, Nita
Sinha and Rahul Sinha
|
Methods for Measuring New-Physics Parameters in B Decays
|
33 pages, latex, no figures. Appendix added. Analysis and conclusions
unchanged
|
Phys.Rev.D71:096002,2005
|
10.1103/PhysRevD.71.096002
|
UdeM-GPP-TH-04-123, McGill 13/04, IMSc/2004/06/25
|
hep-ph hep-ex
| null |
Recently, it was argued that new-physics (NP) effects in B decays can be
approximately parametrized in terms of a few quantities. As a result, CP
violation in the $B$ system allows one not only to detect the presence of new
physics (NP), but also to measure its parameters. This will allow a partial
identification of the NP, before its production at high-energy colliders. In
this paper, we examine three methods for measuring NP parameters. The first
uses a technique involving both $\btos$ and $\btod$ penguin B decays. Depending
on which pair of decays is used, the theoretical error is in the range 5--15%.
The second involves a comparison of $B\to \pi K$ and $B\to\pi\pi$ decays.
Although the theoretical error is large ($\gsim 25%$), the method can be
performed now, with presently-available data. The third is via a time-dependent
angular analysis of $\bvv$ decays. In this case, there is no theoretical error,
but the technique is experimentally challenging, and the method applies only to
those NP models whose weak phase is universal to all NP operators. A reliable
identification of the NP will involve the measurement of the NP parameters in
many different ways, and with as many B decay modes as possible, so that it
will be important to use all of these methods.
|
[
{
"created": "Thu, 17 Jun 2004 14:57:47 GMT",
"version": "v1"
},
{
"created": "Fri, 18 Jun 2004 13:51:23 GMT",
"version": "v2"
},
{
"created": "Wed, 13 Apr 2005 15:28:00 GMT",
"version": "v3"
}
] |
2014-11-17
|
[
[
"Datta",
"Alakabha",
""
],
[
"Imbeault",
"Maxime",
""
],
[
"London",
"David",
""
],
[
"Page",
"Veronique",
""
],
[
"Sinha",
"Nita",
""
],
[
"Sinha",
"Rahul",
""
]
] |
Recently, it was argued that new-physics (NP) effects in B decays can be approximately parametrized in terms of a few quantities. As a result, CP violation in the $B$ system allows one not only to detect the presence of new physics (NP), but also to measure its parameters. This will allow a partial identification of the NP, before its production at high-energy colliders. In this paper, we examine three methods for measuring NP parameters. The first uses a technique involving both $\btos$ and $\btod$ penguin B decays. Depending on which pair of decays is used, the theoretical error is in the range 5--15%. The second involves a comparison of $B\to \pi K$ and $B\to\pi\pi$ decays. Although the theoretical error is large ($\gsim 25%$), the method can be performed now, with presently-available data. The third is via a time-dependent angular analysis of $\bvv$ decays. In this case, there is no theoretical error, but the technique is experimentally challenging, and the method applies only to those NP models whose weak phase is universal to all NP operators. A reliable identification of the NP will involve the measurement of the NP parameters in many different ways, and with as many B decay modes as possible, so that it will be important to use all of these methods.
|
hep-ph/9912385
|
Chi-Keung Chow
|
Chi-Keung Chow and Thomas D. Cohen
|
Symmetries of Excited Heavy Baryons In The Heavy Quark And Large N_c
Limit
|
5 pages in REVTeX
|
Phys.Rev.Lett. 84 (2000) 5474-5477
|
10.1103/PhysRevLett.84.5474
|
DOE/ER/40762-200, UMD PP#00-045
|
hep-ph hep-ex nucl-th
| null |
We demonstrate in a model independent way that, in the combined heavy quark
and large N_c limit, there exists a new contracted U(4) symmetry which connects
orbitally excited heavy baryons to the ground states.
|
[
{
"created": "Thu, 16 Dec 1999 19:48:48 GMT",
"version": "v1"
}
] |
2009-10-31
|
[
[
"Chow",
"Chi-Keung",
""
],
[
"Cohen",
"Thomas D.",
""
]
] |
We demonstrate in a model independent way that, in the combined heavy quark and large N_c limit, there exists a new contracted U(4) symmetry which connects orbitally excited heavy baryons to the ground states.
|
2007.13141
|
Ying Li
|
Zhi-Tian Zou, Ying Li, Hsiang-nan Li
|
Is $f_X(1500)$ observed in the $B\to \pi(K)KK$ decays $\rho^0(1450)$?
|
7 Pages, 3 Figures. Accepted by PRD
|
Phys. Rev. D 103, 013005 (2021)
|
10.1103/PhysRevD.103.013005
| null |
hep-ph hep-ex
|
http://creativecommons.org/licenses/by/4.0/
|
We suggest that the uncertain state $f_X(1500)$ observed by Belle and BaBar
more than a decade ago, which has been viewed as a single scalar or a
combination of several even spin resonances, is the vector $\rho^0(1450)$
reported recently by LHCb. Adopting the perturbative QCD approach, we determine
the di-kaon distribution amplitudes with the $\rho^0(1450)$ resonance from the
LHCb data for the quasi-two-body decays $B^{\pm}\to
\pi^{\pm}\rho^0(1450)\to\pi^{\pm}K^+K^-$. It is then shown that the $B^+ \to
K^+K^+K^-$ decay spectrum around the invariant mass $M(K^+K^-)\sim 1.5~\rm GeV$
measured by BaBar can be well described by the resonant contribution from
$\rho^0(1450)$. The broad structure in the $B^{+}\to K^{+} K_SK_S$ spectrum
around the invariant mass $1.5~\rm GeV$ of a $K_SK_S$ pair, which
$\rho^0(1450)$ cannot decay into because of Bose-Einstein statistics, can be
accounted for by a nonresonant $S$-wave contribution alone. The branching
fractions and/or the direct $CP$ asymmetries of the $B^{\pm}\to
\pi^{\pm}\rho^0(1450)\to\pi^{\pm}K^+K^-$, $B^{+}\to K^{+}\rho^0(1450)\to
K^+K^+K^-$ and $B^{0}\to K^{0}\rho^0(1450)\to K^0K^+K^-$ modes are predicted,
which can be tested at the ongoing LHCb and Belle-II experiments. We encourage
experimental colleagues to scrutinize our postulation by analyzing relevant
data with higher precision.
|
[
{
"created": "Sun, 26 Jul 2020 14:56:05 GMT",
"version": "v1"
},
{
"created": "Mon, 11 Jan 2021 13:00:37 GMT",
"version": "v2"
}
] |
2021-01-20
|
[
[
"Zou",
"Zhi-Tian",
""
],
[
"Li",
"Ying",
""
],
[
"Li",
"Hsiang-nan",
""
]
] |
We suggest that the uncertain state $f_X(1500)$ observed by Belle and BaBar more than a decade ago, which has been viewed as a single scalar or a combination of several even spin resonances, is the vector $\rho^0(1450)$ reported recently by LHCb. Adopting the perturbative QCD approach, we determine the di-kaon distribution amplitudes with the $\rho^0(1450)$ resonance from the LHCb data for the quasi-two-body decays $B^{\pm}\to \pi^{\pm}\rho^0(1450)\to\pi^{\pm}K^+K^-$. It is then shown that the $B^+ \to K^+K^+K^-$ decay spectrum around the invariant mass $M(K^+K^-)\sim 1.5~\rm GeV$ measured by BaBar can be well described by the resonant contribution from $\rho^0(1450)$. The broad structure in the $B^{+}\to K^{+} K_SK_S$ spectrum around the invariant mass $1.5~\rm GeV$ of a $K_SK_S$ pair, which $\rho^0(1450)$ cannot decay into because of Bose-Einstein statistics, can be accounted for by a nonresonant $S$-wave contribution alone. The branching fractions and/or the direct $CP$ asymmetries of the $B^{\pm}\to \pi^{\pm}\rho^0(1450)\to\pi^{\pm}K^+K^-$, $B^{+}\to K^{+}\rho^0(1450)\to K^+K^+K^-$ and $B^{0}\to K^{0}\rho^0(1450)\to K^0K^+K^-$ modes are predicted, which can be tested at the ongoing LHCb and Belle-II experiments. We encourage experimental colleagues to scrutinize our postulation by analyzing relevant data with higher precision.
|
hep-ph/0401215
|
St\'ephane Munier
|
S. Munier (Ecole polytechnique), R. Peschanski (Saclay)
|
Universality and tree structure of high energy QCD
|
4 pages, 3 figures
|
Phys.Rev.D70:077503,2004
|
10.1103/PhysRevD.70.077503
|
CPHT-RR-003.0104, SACLAY-T04/011
|
hep-ph cond-mat.stat-mech hep-th
| null |
Using non-trivial mathematical properties of a class of nonlinear evolution
equations, we obtain the universal terms in the asymptotic expansion in
rapidity of the saturation scale and of the unintegrated gluon density from the
Balitsky-Kovchegov equation. These terms are independent of the initial
conditions and of the details of the equation. The last subasymptotic terms are
new results and complete the list of all possible universal contributions.
Universality is interpreted in a general qualitative picture of high energy
scattering, in which a scattering process corresponds to a tree structure
probed by a given source.
|
[
{
"created": "Tue, 27 Jan 2004 10:08:38 GMT",
"version": "v1"
}
] |
2008-11-26
|
[
[
"Munier",
"S.",
"",
"Ecole polytechnique"
],
[
"Peschanski",
"R.",
"",
"Saclay"
]
] |
Using non-trivial mathematical properties of a class of nonlinear evolution equations, we obtain the universal terms in the asymptotic expansion in rapidity of the saturation scale and of the unintegrated gluon density from the Balitsky-Kovchegov equation. These terms are independent of the initial conditions and of the details of the equation. The last subasymptotic terms are new results and complete the list of all possible universal contributions. Universality is interpreted in a general qualitative picture of high energy scattering, in which a scattering process corresponds to a tree structure probed by a given source.
|
hep-ph/9907349
|
Lai-Him Chan
|
Lai-Him Chan
|
Induced Lorentz-Violating Chern-Simons Term in QED and Anomalous
Contributions to Effective Action Expansions
|
8 pages
| null | null | null |
hep-ph
| null |
I present a unified formulation of anomalous contributions in quantum field
theories by calculating directly the effective action using the background
field and covariant-derivative expansion technique. I use this method to
determine uniquely the induced Chern-Simons term from the a Lorentz and CPT
violating term in fermion QED Lagrangian. The outstanding ambiguity is resolved
by properly taken into account the noncommutivity of $A$ and $\partial$. The
resulting vacuum polarization tensor acquires a non-Feynman diagram anomalous
contribution which accounts for the discrepancy between the present calculation
and the other calculations.
|
[
{
"created": "Wed, 14 Jul 1999 03:18:30 GMT",
"version": "v1"
},
{
"created": "Wed, 23 Aug 2000 21:52:11 GMT",
"version": "v2"
}
] |
2007-05-23
|
[
[
"Chan",
"Lai-Him",
""
]
] |
I present a unified formulation of anomalous contributions in quantum field theories by calculating directly the effective action using the background field and covariant-derivative expansion technique. I use this method to determine uniquely the induced Chern-Simons term from the a Lorentz and CPT violating term in fermion QED Lagrangian. The outstanding ambiguity is resolved by properly taken into account the noncommutivity of $A$ and $\partial$. The resulting vacuum polarization tensor acquires a non-Feynman diagram anomalous contribution which accounts for the discrepancy between the present calculation and the other calculations.
|
1804.04844
|
Reza Khosravi
|
S. Momeni, R. Khosravi
|
Semileptonic $B_{(s)}\to a_1(K_1)\ell^+ \ell^-$ decays via the
light-cone sum rules with $B$-meson distribution amplitudes
|
14 pages, 5 figures
|
Phys. Rev. D 96, 016018 (2017)
|
10.1103/PhysRevD.96.016018
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
The form factors of semileptonic $B_{(s)}\to a_{1}(K_1)\, \ell^{+}\ell^{-}$,
$ \ell=\tau,\mu,e$ transitions are investigated in the framework of the
light-cone sum rules with $B$-meson distribution amplitudes, which play an
important role in exclusive $B$ decays. The $B$-meson distribution amplitudes,
$\varphi_{\pm}(\omega)$ are a model-dependent form, so we consider four
different parameterizations which can provide a reasonable description of
$\varphi_{\pm}(\omega)$ from QCD corrections. The branching fractions of these
transitions are calculated. For a better analysis, a comparison of our results
with the prediction of other models is provided.
|
[
{
"created": "Fri, 13 Apr 2018 09:03:09 GMT",
"version": "v1"
}
] |
2018-04-25
|
[
[
"Momeni",
"S.",
""
],
[
"Khosravi",
"R.",
""
]
] |
The form factors of semileptonic $B_{(s)}\to a_{1}(K_1)\, \ell^{+}\ell^{-}$, $ \ell=\tau,\mu,e$ transitions are investigated in the framework of the light-cone sum rules with $B$-meson distribution amplitudes, which play an important role in exclusive $B$ decays. The $B$-meson distribution amplitudes, $\varphi_{\pm}(\omega)$ are a model-dependent form, so we consider four different parameterizations which can provide a reasonable description of $\varphi_{\pm}(\omega)$ from QCD corrections. The branching fractions of these transitions are calculated. For a better analysis, a comparison of our results with the prediction of other models is provided.
|
1706.02472
|
Y.H Ahn
|
Y. H. Ahn
|
A necessary condition for sphaleron process in the presence of anomalous
$U(1)$ symmetry
|
Title and main arguments are changed. 5 pages
| null | null | null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We argue that, in the presence of anomalous $U(1)$ symmetries, the invariance
of Lagrangian including the standard model (SM) under the axionic shift
symmetries requires a necessary condition $\sum_i\delta^{\rm GS}_{i}\leq2N_f$,
where $N_f$ stands for the number of families in the SM and $\delta^{\rm GS}_i$
(Green-Schwarz parameter) characterizes the coupling of the anomalous $U(1)$
gauge boson to the corresponding axion. In turn, we show that in order for the
usual $B+L$ violating sphaleron process to be valid a necessary condition
$\sum_i\delta^{\rm GS}_{i}<2N_f$ is required, where $B(L)$ stands for the
baryon(lepton) number.
|
[
{
"created": "Thu, 8 Jun 2017 08:12:40 GMT",
"version": "v1"
},
{
"created": "Sun, 23 Jul 2017 05:10:41 GMT",
"version": "v2"
}
] |
2017-07-25
|
[
[
"Ahn",
"Y. H.",
""
]
] |
We argue that, in the presence of anomalous $U(1)$ symmetries, the invariance of Lagrangian including the standard model (SM) under the axionic shift symmetries requires a necessary condition $\sum_i\delta^{\rm GS}_{i}\leq2N_f$, where $N_f$ stands for the number of families in the SM and $\delta^{\rm GS}_i$ (Green-Schwarz parameter) characterizes the coupling of the anomalous $U(1)$ gauge boson to the corresponding axion. In turn, we show that in order for the usual $B+L$ violating sphaleron process to be valid a necessary condition $\sum_i\delta^{\rm GS}_{i}<2N_f$ is required, where $B(L)$ stands for the baryon(lepton) number.
|
1204.0260
|
Nan Su
|
Nan Su
|
A brief overview of hard-thermal-loop perturbation theory
|
20 pages, 11 figures; Review article for the program on "AdS/CFT and
Novel Approaches to Hadron and Heavy Ion Physics", October 11 - December 3,
2010, Kavli Institute for Theoretical Physics China (KITPC), Chinese Academy
of Sciences (CAS), Beijing, China. Published version in Communications in
Theoretical Physics
|
Commun. Theor. Phys. 57 (2012) 409
|
10.1088/0253-6102/57/3/12
| null |
hep-ph hep-lat hep-th nucl-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
The poor convergence of quantum field theory at finite temperature has been
one of the main obstacles in the practical applications of thermal QCD for
decades. Here we briefly review the progress of hard-thermal-loop perturbation
theory (HTLpt) in reorganizing the perturbative expansion in order to improve
the convergence. The quantum mechanical anharmonic oscillator is used as a
simple example to show the breakdown of weak-coupling expansion, and
variational perturbation theory is introduced as an effective resummation
scheme for divergent weak-coupling expansions. We discuss HTLpt thermodynamic
calculations for QED, pure-glue QCD, and QCD with N_f=3 up to three-loop order.
The results suggest that HTLpt provides a systematic framework that can be used
to calculate both static and dynamic quantities for temperatures relevant at
LHC.
|
[
{
"created": "Sun, 1 Apr 2012 20:02:03 GMT",
"version": "v1"
}
] |
2012-04-03
|
[
[
"Su",
"Nan",
""
]
] |
The poor convergence of quantum field theory at finite temperature has been one of the main obstacles in the practical applications of thermal QCD for decades. Here we briefly review the progress of hard-thermal-loop perturbation theory (HTLpt) in reorganizing the perturbative expansion in order to improve the convergence. The quantum mechanical anharmonic oscillator is used as a simple example to show the breakdown of weak-coupling expansion, and variational perturbation theory is introduced as an effective resummation scheme for divergent weak-coupling expansions. We discuss HTLpt thermodynamic calculations for QED, pure-glue QCD, and QCD with N_f=3 up to three-loop order. The results suggest that HTLpt provides a systematic framework that can be used to calculate both static and dynamic quantities for temperatures relevant at LHC.
|
hep-ph/9211210
|
Rick Weller
|
John S. Hagelin and S. Kelley
|
Evidence For SUSY from GUTS? Evidence For GUTS From SUSY!
|
19 pages plus 5 figures available on request, MIU-THP-92/61
| null | null | null |
hep-ph
| null |
We review the theoretical and experimental status of minimal grand unified
theories (GUTS), contrasting the failure of minimal non-supersymmetric $SU(5)$
with the success of the minimal supersymmetric $SU(5)$ and minimal
supersymmetric Flipped $SU(5)\times U(1)$ models. We show that a reasonable
value for the universal soft supersymmetry-breaking gaugino mass,
$45\GeV<m_{1/2}<1\TeV$, and a $1-\sigma$ range of the other inputs constrains
the strong coupling, $\as>.114$. We define the supersymmetric standard model
(SSM), the minimal supersymmetric extension of the standard model with gauge
coupling unification and universal soft supersymmetry-breaking at the
unification scale, as a baseline model for unified theories. We review the
structure of the allowed parameter space of the SSM and suggest sparticle
spectroscopy as the experimental means to determine the parameters of the SSM
and search for departures from the baseline SSM.
|
[
{
"created": "Wed, 4 Nov 1992 02:11:28 GMT",
"version": "v1"
}
] |
2007-05-23
|
[
[
"Hagelin",
"John S.",
""
],
[
"Kelley",
"S.",
""
]
] |
We review the theoretical and experimental status of minimal grand unified theories (GUTS), contrasting the failure of minimal non-supersymmetric $SU(5)$ with the success of the minimal supersymmetric $SU(5)$ and minimal supersymmetric Flipped $SU(5)\times U(1)$ models. We show that a reasonable value for the universal soft supersymmetry-breaking gaugino mass, $45\GeV<m_{1/2}<1\TeV$, and a $1-\sigma$ range of the other inputs constrains the strong coupling, $\as>.114$. We define the supersymmetric standard model (SSM), the minimal supersymmetric extension of the standard model with gauge coupling unification and universal soft supersymmetry-breaking at the unification scale, as a baseline model for unified theories. We review the structure of the allowed parameter space of the SSM and suggest sparticle spectroscopy as the experimental means to determine the parameters of the SSM and search for departures from the baseline SSM.
|
1609.03042
|
Gabriele Inghirami
|
Gabriele Inghirami, Luca Del Zanna, Andrea Beraudo, Mohsen Haddadi
Moghaddam, Francesco Becattini, Marcus Bleicher
|
Numerical magneto-hydrodynamics for relativistic nuclear collisions
|
19 pages, 14 figures, vers. 3: final version, with minor changes in
the text (introduction and conclusions)
| null |
10.1140/epjc/s10052-016-4516-8
| null |
hep-ph nucl-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We present an improved version of the ECHO-QGP numerical code, which
self-consistently includes for the first time the effects of electromagnetic
fields within the framework of relativistic magnetohydrodynamics (RMHD). We
discuss results of its application in relativistic heavy-ion collisions in the
limit of infinite electrical conductivity of the plasma. After reviewing the
relevant covariant $3\!+\!1$ formalisms, we illustrate the implementation of
the evolution equations in the code and show the results of several tests aimed
at assessing the accuracy and robustness of the implementation. After providing
some estimates of the magnetic fields arising in non-central high-energy
nuclear collisions, we perform full RMHD simulations of the evolution of the
Quark-Gluon Plasma in the presence of electromagnetic fields and discuss the
results. In our ideal RMHD setup we find that the magnetic field developing in
non-central collisions does not significantly modify the elliptic-flow of the
final hadrons. However, since there are uncertainties in the description of the
pre-equilibrium phase and also in the properties of the medium, a more
extensive survey of the possible initial conditions as well as the inclusion of
dissipative effects are indeed necessary to validate this preliminary result.
|
[
{
"created": "Sat, 10 Sep 2016 12:50:46 GMT",
"version": "v1"
},
{
"created": "Mon, 19 Sep 2016 15:00:11 GMT",
"version": "v2"
},
{
"created": "Wed, 11 Jan 2017 17:20:24 GMT",
"version": "v3"
}
] |
2017-01-12
|
[
[
"Inghirami",
"Gabriele",
""
],
[
"Del Zanna",
"Luca",
""
],
[
"Beraudo",
"Andrea",
""
],
[
"Moghaddam",
"Mohsen Haddadi",
""
],
[
"Becattini",
"Francesco",
""
],
[
"Bleicher",
"Marcus",
""
]
] |
We present an improved version of the ECHO-QGP numerical code, which self-consistently includes for the first time the effects of electromagnetic fields within the framework of relativistic magnetohydrodynamics (RMHD). We discuss results of its application in relativistic heavy-ion collisions in the limit of infinite electrical conductivity of the plasma. After reviewing the relevant covariant $3\!+\!1$ formalisms, we illustrate the implementation of the evolution equations in the code and show the results of several tests aimed at assessing the accuracy and robustness of the implementation. After providing some estimates of the magnetic fields arising in non-central high-energy nuclear collisions, we perform full RMHD simulations of the evolution of the Quark-Gluon Plasma in the presence of electromagnetic fields and discuss the results. In our ideal RMHD setup we find that the magnetic field developing in non-central collisions does not significantly modify the elliptic-flow of the final hadrons. However, since there are uncertainties in the description of the pre-equilibrium phase and also in the properties of the medium, a more extensive survey of the possible initial conditions as well as the inclusion of dissipative effects are indeed necessary to validate this preliminary result.
|
hep-ph/0212408
|
Igor Marfin
|
T.V. Shishkina, I.B. Marfin
|
Polarized lepton-nucleon scattering in frame of various guage model
|
15 pages, 13 figures
| null | null | null |
hep-ph
| null |
The cross section for deep inelastic lepton-nucleon scattering with arbitrary
polarized scattering fermions is calculated within the electroweak Standard
Model and non-minimal gauge models with additional neutral boson. The
Lorentz-invariant formulas for cross section and all types of electroweak
asymmetries, polarized, charge-polarized, charged, including the first-order
electroweak radiative correction are obtained. We present a detailed numerical
discussion of the radiative corrections to different kinds of electroweak
asymmetries. The difference in the results obtained in frame of minimal and
nonminimal gauge models increases significantly with the energy of incident
leptons and reaches the maximum value for the largest values of scaling
variable $y$, where radiative corrections is important object for precision
analysis of experimental data.
|
[
{
"created": "Tue, 31 Dec 2002 11:32:06 GMT",
"version": "v1"
}
] |
2007-05-23
|
[
[
"Shishkina",
"T. V.",
""
],
[
"Marfin",
"I. B.",
""
]
] |
The cross section for deep inelastic lepton-nucleon scattering with arbitrary polarized scattering fermions is calculated within the electroweak Standard Model and non-minimal gauge models with additional neutral boson. The Lorentz-invariant formulas for cross section and all types of electroweak asymmetries, polarized, charge-polarized, charged, including the first-order electroweak radiative correction are obtained. We present a detailed numerical discussion of the radiative corrections to different kinds of electroweak asymmetries. The difference in the results obtained in frame of minimal and nonminimal gauge models increases significantly with the energy of incident leptons and reaches the maximum value for the largest values of scaling variable $y$, where radiative corrections is important object for precision analysis of experimental data.
|
0907.3997
|
David R. Entem
|
P.G. Ortega, J. Segovia, D.R. Entem and F. Fernandez
|
Coupled channel approach to the structure of the X(3872)
|
10 pages, 3 figures. Direct comparison with Belle and Babar data has
been included.
|
Phys.Rev.D81:0054023,2010
|
10.1103/PhysRevD.81.0054023
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We have performed a coupled channel calculation of the $1^{++}$ $c\bar c$
sector including $q\bar q$ and $DD^*$ molecular configurations. The calculation
was done within a constituent quark model which successfully describes the
meson spectrum, in particular the $c\bar c$ $1^{--}$ sector. Two and four quark
configurations are coupled using the $^3P_0$ model. The elusive X(3872) meson
appears as a new state with a high probability for the $DD^*$ molecular
component. When the mass difference between neutral and charged states is
included a large $D^0 {D^*}^0$ component is found which dominates for large
distances and breaks isospin symmetry in the physical state. The original
$c\bar c(2 ^3P_1)$ state acquires a sizable $DD^*$ component and can be
identified with the X(3940). We study the $B\to K \pi^+ \pi^-J/\psi$ and $B\to
K D^0 D^{*0}$ decays finding a good agreement with Belle and BaBar experimental
data.
|
[
{
"created": "Thu, 23 Jul 2009 08:05:08 GMT",
"version": "v1"
},
{
"created": "Wed, 24 Mar 2010 12:50:31 GMT",
"version": "v2"
}
] |
2015-03-13
|
[
[
"Ortega",
"P. G.",
""
],
[
"Segovia",
"J.",
""
],
[
"Entem",
"D. R.",
""
],
[
"Fernandez",
"F.",
""
]
] |
We have performed a coupled channel calculation of the $1^{++}$ $c\bar c$ sector including $q\bar q$ and $DD^*$ molecular configurations. The calculation was done within a constituent quark model which successfully describes the meson spectrum, in particular the $c\bar c$ $1^{--}$ sector. Two and four quark configurations are coupled using the $^3P_0$ model. The elusive X(3872) meson appears as a new state with a high probability for the $DD^*$ molecular component. When the mass difference between neutral and charged states is included a large $D^0 {D^*}^0$ component is found which dominates for large distances and breaks isospin symmetry in the physical state. The original $c\bar c(2 ^3P_1)$ state acquires a sizable $DD^*$ component and can be identified with the X(3940). We study the $B\to K \pi^+ \pi^-J/\psi$ and $B\to K D^0 D^{*0}$ decays finding a good agreement with Belle and BaBar experimental data.
|
1603.06573
|
Kazuki Sakurai
|
John Ellis, Kazuki Sakurai and Michael Spannowsky
|
Search for Sphalerons: IceCube vs. LHC
|
13 pages, 5 figures
| null | null |
KCL-PH-TH/2016-13, LCTS/2016-08, CERN-TH/2016-064, IPPP/16/24
|
hep-ph hep-ex hep-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We discuss the observability of neutrino-induced sphaleron transitions in the
IceCube detector, encouraged by a recent paper by Tye and Wong (TW), which
argued on the basis of a Bloch wave function in the periodic sphaleron
potential that such transitions should be enhanced compared to most previous
calculations. We calculate the dependence on neutrino energy of the sphaleron
transition rate, comparing it to that for conventional neutrino interactions,
and we discuss the observability of tau and multi-muon production in
sphaleron-induced transitions. We use IceCube 4-year data to constrain the
sphaleron rate, finding that it is comparable to the upper limit inferred
previously from a recast of an ATLAS search for microscopic black holes at the
LHC with $\sim 3$/fb of collisions at 13 TeV. The IceCube constraint is
stronger for a sphaleron barrier height $E_{\rm Sph} \gtrsim 9$ TeV, and would
be comparable with the prospective LHC sensitivity with 300/fb of data at 14
TeV if $E_{\rm Sph} \sim 11$ TeV.
|
[
{
"created": "Mon, 21 Mar 2016 20:00:00 GMT",
"version": "v1"
}
] |
2016-03-23
|
[
[
"Ellis",
"John",
""
],
[
"Sakurai",
"Kazuki",
""
],
[
"Spannowsky",
"Michael",
""
]
] |
We discuss the observability of neutrino-induced sphaleron transitions in the IceCube detector, encouraged by a recent paper by Tye and Wong (TW), which argued on the basis of a Bloch wave function in the periodic sphaleron potential that such transitions should be enhanced compared to most previous calculations. We calculate the dependence on neutrino energy of the sphaleron transition rate, comparing it to that for conventional neutrino interactions, and we discuss the observability of tau and multi-muon production in sphaleron-induced transitions. We use IceCube 4-year data to constrain the sphaleron rate, finding that it is comparable to the upper limit inferred previously from a recast of an ATLAS search for microscopic black holes at the LHC with $\sim 3$/fb of collisions at 13 TeV. The IceCube constraint is stronger for a sphaleron barrier height $E_{\rm Sph} \gtrsim 9$ TeV, and would be comparable with the prospective LHC sensitivity with 300/fb of data at 14 TeV if $E_{\rm Sph} \sim 11$ TeV.
|
hep-ph/0004234
|
Stephane Peigne'
|
Nils Marchal, Stephane Peigne and Paul Hoyer
|
Quarkonium Production through Hard Comover Scattering. II
|
7 pages, revtex
|
Phys.Rev. D62 (2000) 114001
|
10.1103/PhysRevD.62.114001
|
NORDITA-2000/43 HE, LAPTH-793/00
|
hep-ph
| null |
We extend to large transverse momentum pt an approach to quarkonium
hadroproduction previously suggested for low pt. The dynamics involves a
perturbative rescattering of the heavy quark pair off a comoving color field
which originates from gluon radiation prior to the heavy quark production
vertex. Assuming simple properties of the comoving field we find the
rescattering scenario to be in reasonable agreement with data. At large pt,
psi' is predicted to be unpolarized, and chi1 production is favoured compared
to chi2. We predict the chi1 polarization to be transverse at low pt, and to
get a longitudinal component at large pt.
|
[
{
"created": "Wed, 26 Apr 2000 10:13:19 GMT",
"version": "v1"
}
] |
2009-10-31
|
[
[
"Marchal",
"Nils",
""
],
[
"Peigne",
"Stephane",
""
],
[
"Hoyer",
"Paul",
""
]
] |
We extend to large transverse momentum pt an approach to quarkonium hadroproduction previously suggested for low pt. The dynamics involves a perturbative rescattering of the heavy quark pair off a comoving color field which originates from gluon radiation prior to the heavy quark production vertex. Assuming simple properties of the comoving field we find the rescattering scenario to be in reasonable agreement with data. At large pt, psi' is predicted to be unpolarized, and chi1 production is favoured compared to chi2. We predict the chi1 polarization to be transverse at low pt, and to get a longitudinal component at large pt.
|
hep-ph/9509396
|
Herbert Weigel
|
A. Abada, H. Weigel and H. Reinhardt
|
Radiative Decays of Hyperons in the Skyrme Model: E2/M1 Transitions
|
10 pages LaTeX, no figures
|
Phys.Lett. B366 (1996) 26
|
10.1016/0370-2693(95)01353-9
|
UNITU-THEP-14/1995
|
hep-ph
| null |
We study the radiative decays of $J^\pi=\frac{3}{2}^+$ baryons in the
framework of the SU(3) collective approach to the Skyrme model. We present the
predictions for the decay widths and the corresponding $E2/M1$ ratios. We find
that all considered ratios are negative and of the order of a few percent only.
We discuss the effects of flavor symmetry breaking and compare our results to
those obtained in related models.
|
[
{
"created": "Tue, 26 Sep 1995 17:39:35 GMT",
"version": "v1"
}
] |
2009-10-28
|
[
[
"Abada",
"A.",
""
],
[
"Weigel",
"H.",
""
],
[
"Reinhardt",
"H.",
""
]
] |
We study the radiative decays of $J^\pi=\frac{3}{2}^+$ baryons in the framework of the SU(3) collective approach to the Skyrme model. We present the predictions for the decay widths and the corresponding $E2/M1$ ratios. We find that all considered ratios are negative and of the order of a few percent only. We discuss the effects of flavor symmetry breaking and compare our results to those obtained in related models.
|
1805.10868
|
Egle Tomasi-Gustafsson
|
Egle Tomasi-Gustafsson and Simone Pacetti
|
Two-photon exchange: myth and history
|
12 pages, 5 figures, contribution to NSTAR 2017, to appear in Few
Body Systems
| null |
10.1007/s00601-018-1416-5
| null |
hep-ph nucl-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
After recalling the arguments for possible excess of two-photon contribution
over $\alpha$-counting, model independent statements about the consequences on
the observables will be given. The relevant experimental data are discussed:
(polarized and unpolarized) electron and positron elastic scattering on the
proton, as well as annihilation data. A reanalysis of unpolarized
electron-proton elastic scattering data is presented in terms of the electric
to magnetic form factor squared ratio. This observable is in principle more
robust against experimental correlations and global normalizations. The present
analysis shows indeed that it is a useful quantity that contains reliable and
coherent information. The comparison with the ratio extracted from the
measurement of the longitudinal to transverse polarization of the recoil proton
in polarized electron-proton scattering shows that the results are compatible.
These results bring a decisive piece of information in the controversy on the
deviation of the proton form factors from the dipole dependence.
|
[
{
"created": "Mon, 28 May 2018 11:19:46 GMT",
"version": "v1"
}
] |
2018-07-04
|
[
[
"Tomasi-Gustafsson",
"Egle",
""
],
[
"Pacetti",
"Simone",
""
]
] |
After recalling the arguments for possible excess of two-photon contribution over $\alpha$-counting, model independent statements about the consequences on the observables will be given. The relevant experimental data are discussed: (polarized and unpolarized) electron and positron elastic scattering on the proton, as well as annihilation data. A reanalysis of unpolarized electron-proton elastic scattering data is presented in terms of the electric to magnetic form factor squared ratio. This observable is in principle more robust against experimental correlations and global normalizations. The present analysis shows indeed that it is a useful quantity that contains reliable and coherent information. The comparison with the ratio extracted from the measurement of the longitudinal to transverse polarization of the recoil proton in polarized electron-proton scattering shows that the results are compatible. These results bring a decisive piece of information in the controversy on the deviation of the proton form factors from the dipole dependence.
|
2205.14095
|
Julie Pag\`es
|
Julie Pag\`es
|
Is the $(g-2)_\mu$ anomaly a threat to Lepton Flavor Conservation?
|
Contribution to the proceedings of "La Thuile 2022, Les Rencontres de
Physique de la Vall\'ee d'Aoste", 6-12 March 2022
| null | null | null |
hep-ph
|
http://creativecommons.org/licenses/by/4.0/
|
Although the $(g-2)_\mu$ anomaly can be explained by New Physics (NP)
involving only muons, a more general flavor structure is usually expected for
NP operators in the Standard Model (SM) Effective Field Theory (SMEFT). In
particular, if one wants to provide a combined explanation of several beyond
the SM effects, like Lepton Flavor Universality (LFU) Violation, as indicated
by the B anomalies, then a strong alignment of the NP operators in flavor space
is required to satisfy the bounds from observables featuring Lepton Flavor
Violation (LFV), like $\mu \to e \gamma$. We derived the tight bound of
$10^{-5}$ on the flavor angle in the dipole operator in the charged-lepton mass
basis in the SMEFT. We found that misalignment in several operators at
high-scale could spoil the alignment at low-scale, through the Renormalization
Group Evolution (RGE) of the SMEFT. In particular, it imposes constraints on
some 4-fermions operators. We explored dynamical mechanisms as well as flavor
symmetries to explain this flavor alignment, and illustrated the difficulty to
reach it in an explicit NP model. If the $(g-2)_\mu$ anomaly is confirmed, the
only natural explanation seems to lie in the individual lepton number
conservation. If this accidental symmetry of the SM is also present in
higher-order terms in the SMEFT, we are led to conclude that quark and lepton
sectors behave quite differently beyond the SM. This proceeding is based on
arXiv:2111.13724.
|
[
{
"created": "Fri, 27 May 2022 16:53:29 GMT",
"version": "v1"
}
] |
2022-05-30
|
[
[
"Pagès",
"Julie",
""
]
] |
Although the $(g-2)_\mu$ anomaly can be explained by New Physics (NP) involving only muons, a more general flavor structure is usually expected for NP operators in the Standard Model (SM) Effective Field Theory (SMEFT). In particular, if one wants to provide a combined explanation of several beyond the SM effects, like Lepton Flavor Universality (LFU) Violation, as indicated by the B anomalies, then a strong alignment of the NP operators in flavor space is required to satisfy the bounds from observables featuring Lepton Flavor Violation (LFV), like $\mu \to e \gamma$. We derived the tight bound of $10^{-5}$ on the flavor angle in the dipole operator in the charged-lepton mass basis in the SMEFT. We found that misalignment in several operators at high-scale could spoil the alignment at low-scale, through the Renormalization Group Evolution (RGE) of the SMEFT. In particular, it imposes constraints on some 4-fermions operators. We explored dynamical mechanisms as well as flavor symmetries to explain this flavor alignment, and illustrated the difficulty to reach it in an explicit NP model. If the $(g-2)_\mu$ anomaly is confirmed, the only natural explanation seems to lie in the individual lepton number conservation. If this accidental symmetry of the SM is also present in higher-order terms in the SMEFT, we are led to conclude that quark and lepton sectors behave quite differently beyond the SM. This proceeding is based on arXiv:2111.13724.
|
1010.5674
|
Ezio Maina
|
Ezio Maina
|
Multiple Parton Interactions in Z+jets production at the LHC. A
comparison of factorized and non--factorized double parton distribution
functions
|
15 pages, 3 plots
|
JHEP 1101:061,2011
|
10.1007/JHEP01(2011)061
|
DFTT 21/2010
|
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We examine the contribution of Multiple Parton Interactions to Z+n-jets
production at the LHC, n=2,3,4, where the Z boson is assumed to decay
leptonically. We compare the results obtained with the correlated GS09 double
parton distribution function with those obtained with two instances of fully
factorized single parton distribution functions: MSTW2008LO and CTEQ6LO. It
appears quite feasible to measure the MPI contribution to Z+2/3/4 jets already
in the first phase of the LHC with a total luminosity of one inverse femtobarn
at 7 TeV. If as expected the trigger threshold for single photons is around 80
GeV, Z+2-jets production may well turn out to be more easily observable than
the gamma+3-jets channel. The MPI cross section is dominated by relatively soft
events with two jets balancing in transverse momentum.
|
[
{
"created": "Wed, 27 Oct 2010 12:58:37 GMT",
"version": "v1"
},
{
"created": "Thu, 20 Jan 2011 14:58:01 GMT",
"version": "v2"
}
] |
2015-03-17
|
[
[
"Maina",
"Ezio",
""
]
] |
We examine the contribution of Multiple Parton Interactions to Z+n-jets production at the LHC, n=2,3,4, where the Z boson is assumed to decay leptonically. We compare the results obtained with the correlated GS09 double parton distribution function with those obtained with two instances of fully factorized single parton distribution functions: MSTW2008LO and CTEQ6LO. It appears quite feasible to measure the MPI contribution to Z+2/3/4 jets already in the first phase of the LHC with a total luminosity of one inverse femtobarn at 7 TeV. If as expected the trigger threshold for single photons is around 80 GeV, Z+2-jets production may well turn out to be more easily observable than the gamma+3-jets channel. The MPI cross section is dominated by relatively soft events with two jets balancing in transverse momentum.
|
2303.12052
|
Evgeny Kryshen
|
E. Kryshen (St. Petersburg, INP), M. Strikman (Penn State U.), M.
Zhalov (St. Petersburg, INP)
|
Photoproduction of $J/\psi$ with neutron tagging in ultra-peripheral
collisions of nuclei at RHIC and the LHC
|
20 pages, 9 figures, new version accepted by PRC
| null | null | null |
hep-ph hep-ex nucl-ex
|
http://creativecommons.org/licenses/by/4.0/
|
We present predictions for the cross sections of the coherent and incoherent
$J/\psi$ photoproduction in ultra-peripheral collisions at RHIC and at the LHC
calculated for different classes of events depending on the presence of
neutrons emitted by colliding nuclei. Since strong nucleus-nucleus interactions
in UPCs are suppressed, it is usually assumed that neutrons at forward
rapidities originate mainly from the electromagnetic dissociation of colliding
nuclei caused by additional photon exchanges. This is a reasonable assumption
for the coherent photoproduction where the state of the target nucleus remains
intact. We consider additional sources of neutrons in the incoherent
quasielastic and nucleon dissociative $J/\psi$ photoproduction and show that
these processes significantly change probabilities of neutron emission compared
to calculations when only neutrons from electromagnetic dissociation of nuclei
are considered. Such studies should allow one to explore the dynamics of
nuclear shadowing in the incoherent $J/\psi$ photoproduction down to $x \sim
10^{-5}$.
|
[
{
"created": "Tue, 21 Mar 2023 17:44:10 GMT",
"version": "v1"
},
{
"created": "Mon, 14 Aug 2023 14:21:50 GMT",
"version": "v2"
}
] |
2023-08-15
|
[
[
"Kryshen",
"E.",
"",
"St. Petersburg, INP"
],
[
"Strikman",
"M.",
"",
"Penn State U."
],
[
"Zhalov",
"M.",
"",
"St. Petersburg, INP"
]
] |
We present predictions for the cross sections of the coherent and incoherent $J/\psi$ photoproduction in ultra-peripheral collisions at RHIC and at the LHC calculated for different classes of events depending on the presence of neutrons emitted by colliding nuclei. Since strong nucleus-nucleus interactions in UPCs are suppressed, it is usually assumed that neutrons at forward rapidities originate mainly from the electromagnetic dissociation of colliding nuclei caused by additional photon exchanges. This is a reasonable assumption for the coherent photoproduction where the state of the target nucleus remains intact. We consider additional sources of neutrons in the incoherent quasielastic and nucleon dissociative $J/\psi$ photoproduction and show that these processes significantly change probabilities of neutron emission compared to calculations when only neutrons from electromagnetic dissociation of nuclei are considered. Such studies should allow one to explore the dynamics of nuclear shadowing in the incoherent $J/\psi$ photoproduction down to $x \sim 10^{-5}$.
|
hep-ph/0412118
|
Chris J. Maxwell
|
M.J. Dinsdale and C.J. Maxwell
|
Resummation of Large Logarithms within the Method of Effective Charges
|
33 pages, 8 figures, expands on material discussed in hep-ph/0408114.
Minor revision of figures and captions
|
Nucl.Phys. B713 (2005) 465-486
|
10.1016/j.nuclphysb.2005.01.048
|
IPPP/04/77, DCPT/04/154
|
hep-ph
| null |
We show how the resummation of large logarithms can be incorporated into the
method of effective charges. As an example, we apply this approach to the event
shape variables thrust and heavy jet mass in e+e- annihilation. We find that,
although the resummation creates problems with the behaviour of the efective
charge in the 2-jet limit, smaller power corrections are required to fit the
data compared to the standard approach. In addition, increasing the logarithmic
accuracy reduces the size of the power corrections further. We also consider
``predicting'' the sub-leading logarithms in the MSbar scheme, obtaining
surprisingly good results for the first few NLL terms.
|
[
{
"created": "Wed, 8 Dec 2004 17:36:28 GMT",
"version": "v1"
},
{
"created": "Tue, 25 Jan 2005 16:42:53 GMT",
"version": "v2"
}
] |
2010-04-05
|
[
[
"Dinsdale",
"M. J.",
""
],
[
"Maxwell",
"C. J.",
""
]
] |
We show how the resummation of large logarithms can be incorporated into the method of effective charges. As an example, we apply this approach to the event shape variables thrust and heavy jet mass in e+e- annihilation. We find that, although the resummation creates problems with the behaviour of the efective charge in the 2-jet limit, smaller power corrections are required to fit the data compared to the standard approach. In addition, increasing the logarithmic accuracy reduces the size of the power corrections further. We also consider ``predicting'' the sub-leading logarithms in the MSbar scheme, obtaining surprisingly good results for the first few NLL terms.
|
hep-ph/0112315
|
Kenzo Ogure
|
Kenzo Ogure, Jiro Arafune, and Takufumi Yoshida
|
Stability and experimental flux bound of Fermi Ball
|
Workshop, Rovaniemi, Finland, August 30 - September 4, 2001. 12
pages, LaTeX, 1 eps figure
| null | null |
KOBE-TH-01-08
|
hep-ph
| null |
We investigate the stability of an Fermi ball(F-ball) within the
next-to-leading order approximation in the thin wall expansion. We find out
that an F-ball is unstable in case that it is electrically neutral. We then
find out that an electrically charged F-ball is metastable in some parameter
range. We lastly discuss the allowed region of parameters of an F-ball, taking
into account the stability of an F-ball and results of experiments.
|
[
{
"created": "Sat, 22 Dec 2001 12:13:49 GMT",
"version": "v1"
}
] |
2007-05-23
|
[
[
"Ogure",
"Kenzo",
""
],
[
"Arafune",
"Jiro",
""
],
[
"Yoshida",
"Takufumi",
""
]
] |
We investigate the stability of an Fermi ball(F-ball) within the next-to-leading order approximation in the thin wall expansion. We find out that an F-ball is unstable in case that it is electrically neutral. We then find out that an electrically charged F-ball is metastable in some parameter range. We lastly discuss the allowed region of parameters of an F-ball, taking into account the stability of an F-ball and results of experiments.
|
hep-ph/0308256
|
Yadong Yang
|
Gongru Lu, Rumin Wang, Yadong Yang
|
The Rare Radiative Annihilation Decays $\bar{B}^0_{s,d} \to
J/\psi\gamma$
|
13pages, 3figures
|
Eur.Phys.J. C34 (2004) 291-296
|
10.1140/epjc/s2004-01711-y
| null |
hep-ph
| null |
We investigate the physics potential of the annihilation decays
$\bar{B}^0_{s,d} \to J/\psi$ $\gamma$ in the Standard Model and beyond. In
naive factorization approach, the branching ratios are estimated to be
$\mathcal{B}(\bar{B}^0_s \to J/\psi\gamma)=1.40\times 10^{-6}$ and
$\mathcal{B}(\bar{B}^0_d \to J/\psi\gamma)=5.29\times 10^{-8}$. In the
framework of QCD factorization, we compute the non-factorizable corrections and
get $\mathcal{B}(\bar{B}^0_s \to J/\psi\gamma) = 2.11\times10^{-7}$,
$\mathcal{B}(\bar{B}^0_d \to J/\psi\gamma) =7.65\times10^{-9}$. Future
measurements of these decays would be useful for testing the factorization
frameworks. The smallness of these decays in the SM make them sensitive probes
of New Physics. As an example, we will consider the possible admixture of (V+A)
charge current to the standard (V-A) current. This admixture will give
significant contributions to the decays.
|
[
{
"created": "Tue, 26 Aug 2003 09:55:58 GMT",
"version": "v1"
}
] |
2016-09-06
|
[
[
"Lu",
"Gongru",
""
],
[
"Wang",
"Rumin",
""
],
[
"Yang",
"Yadong",
""
]
] |
We investigate the physics potential of the annihilation decays $\bar{B}^0_{s,d} \to J/\psi$ $\gamma$ in the Standard Model and beyond. In naive factorization approach, the branching ratios are estimated to be $\mathcal{B}(\bar{B}^0_s \to J/\psi\gamma)=1.40\times 10^{-6}$ and $\mathcal{B}(\bar{B}^0_d \to J/\psi\gamma)=5.29\times 10^{-8}$. In the framework of QCD factorization, we compute the non-factorizable corrections and get $\mathcal{B}(\bar{B}^0_s \to J/\psi\gamma) = 2.11\times10^{-7}$, $\mathcal{B}(\bar{B}^0_d \to J/\psi\gamma) =7.65\times10^{-9}$. Future measurements of these decays would be useful for testing the factorization frameworks. The smallness of these decays in the SM make them sensitive probes of New Physics. As an example, we will consider the possible admixture of (V+A) charge current to the standard (V-A) current. This admixture will give significant contributions to the decays.
|
2102.11826
|
Claudio Coriano
|
Claudio Corian\`o, PaulH. Frampton, Jihn E. Kim
|
Ultralight Axions Versus Primordial Black Holes
|
12 pages
| null |
10.1142/S0217732321502412
| null |
hep-ph hep-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We reconsider entropy arguments which have been previously argued to support
the idea that the dark matter constituents are primordial black holes with many
solar masses. It has recently been shown that QCD axions which solve the strong
CP problem may have masses $m_a$ in the extended range $10^{-3}eV > m_a >
10^{-33} eV$. Ultralight axions provide so many degrees of freedom that their
entropy can exceed that of primordial black holes. This suggests that
ultralight axions are more suited than primordial black holes to be
constituents of dark matter.
|
[
{
"created": "Tue, 23 Feb 2021 17:56:37 GMT",
"version": "v1"
},
{
"created": "Tue, 2 Mar 2021 14:13:22 GMT",
"version": "v2"
}
] |
2021-12-08
|
[
[
"Corianò",
"Claudio",
""
],
[
"Frampton",
"PaulH.",
""
],
[
"Kim",
"Jihn E.",
""
]
] |
We reconsider entropy arguments which have been previously argued to support the idea that the dark matter constituents are primordial black holes with many solar masses. It has recently been shown that QCD axions which solve the strong CP problem may have masses $m_a$ in the extended range $10^{-3}eV > m_a > 10^{-33} eV$. Ultralight axions provide so many degrees of freedom that their entropy can exceed that of primordial black holes. This suggests that ultralight axions are more suited than primordial black holes to be constituents of dark matter.
|
0801.2949
|
Claudio Coriano
|
Claudio Coriano, Marco Guzzi and Simone Morelli
|
Unitarity Bounds for Gauged Axionic Interactions and the Green-Schwarz
Mechanism
|
50 pages, 28 figures
|
Eur.Phys.J.C55:629-652,2008
|
10.1140/epjc/s10052-008-0616-4
| null |
hep-ph
| null |
We analyze the effective actions of anomalous models in which a
four-dimensional version of the Green-Schwarz mechanism is invoked for the
cancellation of the anomalies, and we compare it with those models in which
gauge invariance is restored by the presence of a Wess-Zumino term. Some issues
concerning an apparent violation of unitarity of the mechanism, which requires
Dolgov-Zakharov poles, are carefully examined, using a class of amplitudes
studied in the past by Bouchiat-Iliopoulos-Meyer (BIM), and elaborating on
previous studies. In the Wess-Zumino case we determine explicitly the unitarity
bound using a realistic model of intersecting branes (the Madrid model) by
studying the corresponding BIM amplitudes. This is shown to depend
significantly on the St\"uckelberg mass and on the coupling of the extra
anomalous gauge bosons and allows one to identify Standard-Model-like regions
(which are anomaly-free) from regions where the growth of certain amplitudes is
dominated by the anomaly, separated by an inflection point which could be
studied at the LHC. The bound can even be around 5-10 TeV's for a $Z'$ mass
around 1 TeV and varies sensitively with the anomalous coupling. The results
for the WZ case are quite general and apply to all the models in which an
axion-like interaction is introduced as a generalization of the Peccei-Quinn
mechanism, with a gauged axion.
|
[
{
"created": "Fri, 18 Jan 2008 19:09:54 GMT",
"version": "v1"
},
{
"created": "Sun, 20 Jan 2008 10:51:24 GMT",
"version": "v2"
},
{
"created": "Fri, 15 Feb 2008 16:01:33 GMT",
"version": "v3"
},
{
"created": "Sat, 16 Feb 2008 18:36:18 GMT",
"version": "v4"
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{
"created": "Fri, 9 May 2008 14:16:42 GMT",
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2008-11-26
|
[
[
"Coriano",
"Claudio",
""
],
[
"Guzzi",
"Marco",
""
],
[
"Morelli",
"Simone",
""
]
] |
We analyze the effective actions of anomalous models in which a four-dimensional version of the Green-Schwarz mechanism is invoked for the cancellation of the anomalies, and we compare it with those models in which gauge invariance is restored by the presence of a Wess-Zumino term. Some issues concerning an apparent violation of unitarity of the mechanism, which requires Dolgov-Zakharov poles, are carefully examined, using a class of amplitudes studied in the past by Bouchiat-Iliopoulos-Meyer (BIM), and elaborating on previous studies. In the Wess-Zumino case we determine explicitly the unitarity bound using a realistic model of intersecting branes (the Madrid model) by studying the corresponding BIM amplitudes. This is shown to depend significantly on the St\"uckelberg mass and on the coupling of the extra anomalous gauge bosons and allows one to identify Standard-Model-like regions (which are anomaly-free) from regions where the growth of certain amplitudes is dominated by the anomaly, separated by an inflection point which could be studied at the LHC. The bound can even be around 5-10 TeV's for a $Z'$ mass around 1 TeV and varies sensitively with the anomalous coupling. The results for the WZ case are quite general and apply to all the models in which an axion-like interaction is introduced as a generalization of the Peccei-Quinn mechanism, with a gauged axion.
|
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