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|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
1309.3970
|
Pavel Fileviez Perez
|
Michael Duerr, Pavel Fileviez Perez
|
Baryonic Dark Matter
|
to appear in Physics Letters B
|
Physics Letters B 732 (2014) 101
|
10.1016/j.physletb.2014.03.011
| null |
hep-ph astro-ph.CO hep-ex
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We investigate a simple extension of the Standard Model where the baryon
number is a local gauge symmetry and the cold dark matter in the Universe can
be described by a fermionic field with baryon number. We refer to this scenario
as "Baryonic Dark Matter''. The stability of the dark matter candidate is a
natural consequence of the spontaneous breaking of baryon number at the low
scale and there is no need to impose an extra discrete symmetry. The
constraints from the relic density and the predictions for direct detection are
discussed in detail. We briefly discuss the testability of this model using the
correlation between the Large Hadron Collider data and possible results from
dark matter experiments.
|
[
{
"created": "Mon, 16 Sep 2013 14:17:36 GMT",
"version": "v1"
},
{
"created": "Fri, 7 Mar 2014 10:01:08 GMT",
"version": "v2"
}
] |
2014-04-01
|
[
[
"Duerr",
"Michael",
""
],
[
"Perez",
"Pavel Fileviez",
""
]
] |
We investigate a simple extension of the Standard Model where the baryon number is a local gauge symmetry and the cold dark matter in the Universe can be described by a fermionic field with baryon number. We refer to this scenario as "Baryonic Dark Matter''. The stability of the dark matter candidate is a natural consequence of the spontaneous breaking of baryon number at the low scale and there is no need to impose an extra discrete symmetry. The constraints from the relic density and the predictions for direct detection are discussed in detail. We briefly discuss the testability of this model using the correlation between the Large Hadron Collider data and possible results from dark matter experiments.
|
2208.10329
|
Chengqun Pang
|
Ya-Rong Wang, Ting-Yan Li, Zheng-Yuan Fang, Hao Chen, Cheng-Qun Pang
|
Study of the $\omega$/$\omega_3$, $\rho$/$\rho_3$ and the newly observed
$\omega$-like state $X(2220)$
|
13 page,1 figure. PRDedition. arXiv admin note: text overlap with
arXiv:1910.12408
|
Phys.Rev.D 106 (2022) 11, 114024
|
10.1103/PhysRevD.106.114024
| null |
hep-ph
|
http://creativecommons.org/licenses/by/4.0/
|
We study the excited states of $\omega$ and $\omega_3$ by comparison with the
$\rho$ and $\rho_3$ families, and discuss the possibility of $X(2220)$ as
$\omega$ excitation by analyzing the mass spectra and strong decay behaviors.
In addition, we predict the masses and widths of $\omega(2D)$ and $\omega_3$and
$\rho_3(4D)$, $\rho_3(1G)$, $\omega_3$ and $\rho_3(2G)$ and $\omega_3(3G)$ and
$\rho_3(3G)$. The abundant information of their two-body strong decays
predicted in this work will be helpful to further study of these $\omega$ and
$\omega_3$ and $\rho$ and $\rho_3$ states in experiment and theory.
|
[
{
"created": "Mon, 22 Aug 2022 14:08:13 GMT",
"version": "v1"
},
{
"created": "Tue, 3 Jan 2023 15:05:45 GMT",
"version": "v2"
}
] |
2023-01-04
|
[
[
"Wang",
"Ya-Rong",
""
],
[
"Li",
"Ting-Yan",
""
],
[
"Fang",
"Zheng-Yuan",
""
],
[
"Chen",
"Hao",
""
],
[
"Pang",
"Cheng-Qun",
""
]
] |
We study the excited states of $\omega$ and $\omega_3$ by comparison with the $\rho$ and $\rho_3$ families, and discuss the possibility of $X(2220)$ as $\omega$ excitation by analyzing the mass spectra and strong decay behaviors. In addition, we predict the masses and widths of $\omega(2D)$ and $\omega_3$and $\rho_3(4D)$, $\rho_3(1G)$, $\omega_3$ and $\rho_3(2G)$ and $\omega_3(3G)$ and $\rho_3(3G)$. The abundant information of their two-body strong decays predicted in this work will be helpful to further study of these $\omega$ and $\omega_3$ and $\rho$ and $\rho_3$ states in experiment and theory.
|
0903.2487
|
Roberto Trotta
|
F. Feroz (Cambridge), M.P. Hobson (Cambridge), L. Roszkowski
(Sheffield), R. Ruiz de Austri (Valencia) and R. Trotta (Imperial)
|
Are BR(b->s gamma) and (g-2)_muon consistent within the Constrained
MSSM?
|
21 pages, 5 figures
| null | null | null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We employ two different statistical tests to examine whether, in the
framework of the Constrained MSSM, the experimentally determined values of
BR(b->s gamma) and the anomalous magnetic moment of the muon, (g-2), are
consistent with each other. Our tests are designed to compare the theoretical
predictions of the CMSSM in data space with the actual measurements, once all
of the CMSSM free parameters have been integrated out and constrained using all
other available data. We investigate the value of (g-2) as obtained by using
e+e- data alone (which shows a ~3sigma discrepancy with the SM prediction) and
as obtained based on tau decay data (which shows a much milder, 1sigma
discrepancy). We find that one of our tests returns either a statistically
inconclusive result or shows weak evidence of tension between BR(b->s gamma)
and the e+e- data based value of (g-2). On the other hand, our second test,
which is more stringent in this application, reveals that the joint
observations of BR(b->s gamma) and (g-2) from e+e- data alone are incompatible
within the CMSSM at the ~2sigma level. On the other hand, for both tests we
find no significant tension between BR(b->s gamma) and the value of (g-2)
evaluated using tau decay data. These results are only weakly dependent on the
three different priors that we employ in the analysis. We conclude that, if the
discrepancy between the Standard Model and the experimental determinations of
(g-2) is confirmed at the 3sigma level, this could be interpreted as strong
evidence against the CMSSM.
|
[
{
"created": "Mon, 16 Mar 2009 13:31:56 GMT",
"version": "v1"
}
] |
2009-03-17
|
[
[
"Feroz",
"F.",
"",
"Cambridge"
],
[
"Hobson",
"M. P.",
"",
"Cambridge"
],
[
"Roszkowski",
"L.",
"",
"Sheffield"
],
[
"de Austri",
"R. Ruiz",
"",
"Valencia"
],
[
"Trotta",
"R.",
"",
"Imperial"
]
] |
We employ two different statistical tests to examine whether, in the framework of the Constrained MSSM, the experimentally determined values of BR(b->s gamma) and the anomalous magnetic moment of the muon, (g-2), are consistent with each other. Our tests are designed to compare the theoretical predictions of the CMSSM in data space with the actual measurements, once all of the CMSSM free parameters have been integrated out and constrained using all other available data. We investigate the value of (g-2) as obtained by using e+e- data alone (which shows a ~3sigma discrepancy with the SM prediction) and as obtained based on tau decay data (which shows a much milder, 1sigma discrepancy). We find that one of our tests returns either a statistically inconclusive result or shows weak evidence of tension between BR(b->s gamma) and the e+e- data based value of (g-2). On the other hand, our second test, which is more stringent in this application, reveals that the joint observations of BR(b->s gamma) and (g-2) from e+e- data alone are incompatible within the CMSSM at the ~2sigma level. On the other hand, for both tests we find no significant tension between BR(b->s gamma) and the value of (g-2) evaluated using tau decay data. These results are only weakly dependent on the three different priors that we employ in the analysis. We conclude that, if the discrepancy between the Standard Model and the experimental determinations of (g-2) is confirmed at the 3sigma level, this could be interpreted as strong evidence against the CMSSM.
|
1207.1676
|
Kazem Azizi
|
K. Azizi, N. Ghahramani, A. R. Olamaei
|
Rare Radiative $B_{c}\rightarrow D_{s1}(2460)\gamma$ Transition in QCD
|
24 Pages and 3 Figures
| null |
10.1103/PhysRevD.87.016013
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We investigate the radiative $B_{c} \to D_{s1} \gamma$ transition in the
framework of QCD sum rules. In particular, we calculate the transition form
factors responsible for this decay in both weak annihilation and
electromagnetic penguin channels using the quark condensate, mixed and
two-gluon condensate diagrams as well as propagation of the soft quark in the
electromagnetic field as non-perturbative corrections. These form factors are
then used to estimate the branching ratios of the channels under consideration.
The total branching ratio of the $B_{c} \to D_{s1} \gamma$ transition is
obtained to be in order of $10^{-5}$, and the dominant contribution comes from
the weak annihilation channel.
|
[
{
"created": "Fri, 6 Jul 2012 16:25:39 GMT",
"version": "v1"
},
{
"created": "Fri, 9 Nov 2012 06:47:00 GMT",
"version": "v2"
},
{
"created": "Thu, 13 Dec 2012 08:31:34 GMT",
"version": "v3"
}
] |
2015-06-05
|
[
[
"Azizi",
"K.",
""
],
[
"Ghahramani",
"N.",
""
],
[
"Olamaei",
"A. R.",
""
]
] |
We investigate the radiative $B_{c} \to D_{s1} \gamma$ transition in the framework of QCD sum rules. In particular, we calculate the transition form factors responsible for this decay in both weak annihilation and electromagnetic penguin channels using the quark condensate, mixed and two-gluon condensate diagrams as well as propagation of the soft quark in the electromagnetic field as non-perturbative corrections. These form factors are then used to estimate the branching ratios of the channels under consideration. The total branching ratio of the $B_{c} \to D_{s1} \gamma$ transition is obtained to be in order of $10^{-5}$, and the dominant contribution comes from the weak annihilation channel.
|
hep-ph/9707287
|
Zurab Kakushadze
|
Gia Dvali and Zurab Kakushadze
|
Dynamical Flavor Hierarchy and Heavy Top
|
7 pages, Revtex 3.0, minor misprints corrected
|
Phys.Lett.B426:78-81,1998
|
10.1016/S0370-2693(98)00273-1
| null |
hep-ph hep-th
| null |
In the Standard Model one of the generations is much heavier than the other
two. We propose a simple mechanism where all three generations are treated on
the equal footing to begin with, and one heavy and two light families emerge
from supersymmetric strong dynamics. The Yukawa mass matrix is identified with
vevs of the meson fields of some additional gauge theory. It is then forced to
have rank one (in the leading order) by non-perturbative superpotential.
|
[
{
"created": "Wed, 9 Jul 1997 01:06:47 GMT",
"version": "v1"
},
{
"created": "Sun, 13 Jul 1997 19:27:21 GMT",
"version": "v2"
},
{
"created": "Thu, 12 Feb 1998 03:37:50 GMT",
"version": "v3"
}
] |
2014-11-17
|
[
[
"Dvali",
"Gia",
""
],
[
"Kakushadze",
"Zurab",
""
]
] |
In the Standard Model one of the generations is much heavier than the other two. We propose a simple mechanism where all three generations are treated on the equal footing to begin with, and one heavy and two light families emerge from supersymmetric strong dynamics. The Yukawa mass matrix is identified with vevs of the meson fields of some additional gauge theory. It is then forced to have rank one (in the leading order) by non-perturbative superpotential.
|
hep-ph/9907481
|
Aoki Mayumi
|
Mayumi Aoki, Noriyuki Oshimo (Ochanomizu University)
|
A Supersymmetric Model with an Extra U(1) Gauge Symmetry
|
10 pages, Revtex
|
Phys.Rev.Lett. 84 (2000) 5269-5272
|
10.1103/PhysRevLett.84.5269
|
OCHA-PP-137
|
hep-ph
| null |
In the standard model the proton is protected from decay naturally by gauge
symmetries, whereas in the ordinary minimal supersymmetric standard model an ad
hoc discrete symmetry is imposed for the proton stability. We present a new
supersymmetric model in which the proton decay is forbidden by an extra U(1)
gauge symmetry. Particle contents are necessarily increased to be free from
anomalies, incorporating right-handed neutrinos. Both Dirac and Majorana masses
are generated for neutrinos, yielding non-vanishing but small masses. The
superpotential consists only of trilinear couplings and the mass parameter
$\mu$ of the minimal model is induced by spontaneous breaking of the U(1)
symmetry.
|
[
{
"created": "Sat, 24 Jul 1999 11:39:32 GMT",
"version": "v1"
}
] |
2009-10-31
|
[
[
"Aoki",
"Mayumi",
"",
"Ochanomizu University"
],
[
"Oshimo",
"Noriyuki",
"",
"Ochanomizu University"
]
] |
In the standard model the proton is protected from decay naturally by gauge symmetries, whereas in the ordinary minimal supersymmetric standard model an ad hoc discrete symmetry is imposed for the proton stability. We present a new supersymmetric model in which the proton decay is forbidden by an extra U(1) gauge symmetry. Particle contents are necessarily increased to be free from anomalies, incorporating right-handed neutrinos. Both Dirac and Majorana masses are generated for neutrinos, yielding non-vanishing but small masses. The superpotential consists only of trilinear couplings and the mass parameter $\mu$ of the minimal model is induced by spontaneous breaking of the U(1) symmetry.
|
1210.4398
|
Wally Melnitchouk
|
F. M. Steffens, M. D. Brown, W. Melnitchouk, S. Sanches
|
Parton distributions in the presence of target mass corrections
|
24 pages, 4 figures, to appear in Phys. Rev. C
| null |
10.1103/PhysRevC.86.065208
|
JLAB-THY-12-1645
|
hep-ph nucl-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We study the consistency of parton distribution functions in the presence of
target mass corrections (TMCs) at low Q^2. We review the standard operator
product expansion derivation of TMCs in both x and moment space, and present
the results in closed form for all unpolarized structure functions and their
moments. To avoid the unphysical region at x > 1 in the standard TMC analysis,
we propose an expansion of the target mass corrected structure functions order
by order in M^2/Q^2, and assess the convergence properties of the resulting
forms numerically.
|
[
{
"created": "Tue, 16 Oct 2012 13:33:39 GMT",
"version": "v1"
},
{
"created": "Tue, 18 Dec 2012 14:37:07 GMT",
"version": "v2"
}
] |
2015-06-11
|
[
[
"Steffens",
"F. M.",
""
],
[
"Brown",
"M. D.",
""
],
[
"Melnitchouk",
"W.",
""
],
[
"Sanches",
"S.",
""
]
] |
We study the consistency of parton distribution functions in the presence of target mass corrections (TMCs) at low Q^2. We review the standard operator product expansion derivation of TMCs in both x and moment space, and present the results in closed form for all unpolarized structure functions and their moments. To avoid the unphysical region at x > 1 in the standard TMC analysis, we propose an expansion of the target mass corrected structure functions order by order in M^2/Q^2, and assess the convergence properties of the resulting forms numerically.
|
hep-ph/0207018
|
Piotr Urban
|
M. Jezabek and P. Urban
|
On the hierarchy of neutrino masses
|
12 pages; Talk presented by M. Jezabek at 'Supersymmetry and Brane
Worlds,' Fifth European Meeting Planck 02, Kazimierz, Poland, May 25-29,
2002, to appear in Acta Phys. Polon. B
|
Acta Phys.Polon. B33 (2002) 2571-2584
| null | null |
hep-ph
| null |
We present a model of neutrino masses combining the seesaw mechanism and
strong Dirac mass hierarchy and at the same time exhibiting a significantly
reduced hierarchy at the level of active neutrino masses. The heavy Majorana
masses are assumed to be degenerate. The suppression of the hierarchy is due to
a symmetric and unitary operator R whose role is discussed. The model gives
realistic mixing and mass spectrum. The mixing of atmospheric neutrinos is
attributed to the charged lepton sector whereas the mixing of solar neutrinos
is due to the neutrino sector. Small U_e3 is a consequence of the model. The
masses of the active neutrinos are given by $\mu_3\approx\sqrt{\Delta m_{@}^2}$
and $\mu_1/\mu_2\approx \tan^2\theta_\odot$.
|
[
{
"created": "Mon, 1 Jul 2002 14:28:58 GMT",
"version": "v1"
}
] |
2007-05-23
|
[
[
"Jezabek",
"M.",
""
],
[
"Urban",
"P.",
""
]
] |
We present a model of neutrino masses combining the seesaw mechanism and strong Dirac mass hierarchy and at the same time exhibiting a significantly reduced hierarchy at the level of active neutrino masses. The heavy Majorana masses are assumed to be degenerate. The suppression of the hierarchy is due to a symmetric and unitary operator R whose role is discussed. The model gives realistic mixing and mass spectrum. The mixing of atmospheric neutrinos is attributed to the charged lepton sector whereas the mixing of solar neutrinos is due to the neutrino sector. Small U_e3 is a consequence of the model. The masses of the active neutrinos are given by $\mu_3\approx\sqrt{\Delta m_{@}^2}$ and $\mu_1/\mu_2\approx \tan^2\theta_\odot$.
|
2109.09313
|
Ulas Ozdem
|
U. Ozdem
|
Magnetic moment of the $\Xi_b(6227)$ as a molecular pentaquark state
|
8 pages, 1 fig
|
Eur. Phys. J. Plus 137, 103 (2022)
|
10.1140/epjp/s13360-022-02339-w
| null |
hep-ph hep-ex hep-lat
|
http://creativecommons.org/licenses/by/4.0/
|
In this study, considering that the $\Xi_b (6227)$ state is in molecular
structure, the magnetic moment of this state is extracted in the light-cone QCD
sum rules. The numerical result is obtained as $\mu_{\Xi_b}= 0.12 \pm
0.03~\mu_N$. The magnetic moment of this state contains important information
of its internal structure and shape deformations. Measurement of the magnetic
moment of the $\Xi_b(6227)$ state in future experimental facilities can be very
helpful in identification of the quantum numbers, as well as comprehension of
the inner structure of this state.
|
[
{
"created": "Mon, 20 Sep 2021 06:13:24 GMT",
"version": "v1"
},
{
"created": "Tue, 11 Jan 2022 11:43:38 GMT",
"version": "v2"
}
] |
2022-01-12
|
[
[
"Ozdem",
"U.",
""
]
] |
In this study, considering that the $\Xi_b (6227)$ state is in molecular structure, the magnetic moment of this state is extracted in the light-cone QCD sum rules. The numerical result is obtained as $\mu_{\Xi_b}= 0.12 \pm 0.03~\mu_N$. The magnetic moment of this state contains important information of its internal structure and shape deformations. Measurement of the magnetic moment of the $\Xi_b(6227)$ state in future experimental facilities can be very helpful in identification of the quantum numbers, as well as comprehension of the inner structure of this state.
|
hep-ph/0512246
|
Aurelio Juste
|
A. Juste
|
Towards a precise measurement of the top quark Yukawa coupling at the
ILC
|
Invited talk at 2005 International Linear Collider Physics and
Detector Workshop and Second ILC Accelerator Workshop, Snowmass, CO
(Snowmass05) 3 pages, LaTeX, 3 eps figures
|
ECONFC0508141:ALCPG0426,2005
| null |
FERMILAB-CONF-05-545-E
|
hep-ph
| null |
A precise measurement of the top quark Yukawa coupling is of great
importance, since it may shed light on the mechanism of EWSB. We study the
prospects of such measurement during the first phase of the ILC at sqrt(s)=500
GeV, focusing in particular on recent theoretical developments as well as the
potential benefits of beam polarization. It is shown that both yield
improvements that could possibly lead to a measurement competitive with the
LHC.
|
[
{
"created": "Tue, 20 Dec 2005 01:32:41 GMT",
"version": "v1"
}
] |
2008-11-26
|
[
[
"Juste",
"A.",
""
]
] |
A precise measurement of the top quark Yukawa coupling is of great importance, since it may shed light on the mechanism of EWSB. We study the prospects of such measurement during the first phase of the ILC at sqrt(s)=500 GeV, focusing in particular on recent theoretical developments as well as the potential benefits of beam polarization. It is shown that both yield improvements that could possibly lead to a measurement competitive with the LHC.
|
hep-ph/0012339
|
Sergo Gerasimov
|
S.B.Gerasimov
|
Photoabsorption sum rules and quark structure parameters of hadrons
|
LaTex, 8 pages, no figures; Talk at the International Conference
"Hadron Structure 2000", Stara Lesna, High Tatra Mountains, Slovak Republic,
2-7 October 2000
| null | null | null |
hep-ph
| null |
Following the idea of the quark-hadron duality we present, within the
constituent quark model approach, the relations between different
bremsstrahlung-weihgted integrals of the nucleon resonance photoexcitation
cross sections and correlation functions of the quark dipole moments in the
nucleon ground state. These functions are of interest for checking detailed
quark-configuration structure of the nucleon state vector. Some applications of
this approach in meson sector are made and the role of meson degrees of freedom
in the electromagnetic baryon observables is briefly discussed.
|
[
{
"created": "Tue, 26 Dec 2000 15:26:40 GMT",
"version": "v1"
}
] |
2007-05-23
|
[
[
"Gerasimov",
"S. B.",
""
]
] |
Following the idea of the quark-hadron duality we present, within the constituent quark model approach, the relations between different bremsstrahlung-weihgted integrals of the nucleon resonance photoexcitation cross sections and correlation functions of the quark dipole moments in the nucleon ground state. These functions are of interest for checking detailed quark-configuration structure of the nucleon state vector. Some applications of this approach in meson sector are made and the role of meson degrees of freedom in the electromagnetic baryon observables is briefly discussed.
|
hep-ph/9609482
|
Francisco Larios
|
F. Larios, Ehab Malkawi and C.-P. Yuan (MSU)
|
Probing the Electroweak Symmetry Breaking Sector with the Top Quark
|
60 pages, LaTeX, 22 eps figures, uses psfig.tex To appear on Acta
Phys. Pol. B 27. Spelling, typos and some references have been corrected
|
Acta Phys.Polon.B27:3741-3803,1996
| null |
MSUHEP-60922
|
hep-ph
| null |
A study on effective anomalous interactions up to dimension 5 of the top
quark with the electroweak gauge bosons is made in the non-linear Chiral
Lagrangian approach. Bounds on the anomalous dimension four terms are obtained
from their contribution to low energy data. Also, the potential contribution to
the production of top quarks at hadron colliders (the Tevatron and the LHC) and
the electron Linear Collider from both dimension 4 and 5 operators is analysed.
|
[
{
"created": "Wed, 25 Sep 1996 23:17:34 GMT",
"version": "v1"
},
{
"created": "Tue, 10 Dec 1996 17:48:19 GMT",
"version": "v2"
}
] |
2014-11-17
|
[
[
"Larios",
"F.",
"",
"MSU"
],
[
"Malkawi",
"Ehab",
"",
"MSU"
],
[
"Yuan",
"C. -P.",
"",
"MSU"
]
] |
A study on effective anomalous interactions up to dimension 5 of the top quark with the electroweak gauge bosons is made in the non-linear Chiral Lagrangian approach. Bounds on the anomalous dimension four terms are obtained from their contribution to low energy data. Also, the potential contribution to the production of top quarks at hadron colliders (the Tevatron and the LHC) and the electron Linear Collider from both dimension 4 and 5 operators is analysed.
|
hep-ph/9310300
|
Mannque Rho
|
Mannque Rho (SPhT/CEA Saclay)
|
Cheshire Cat Hadrons
|
(Lectures given at Latin American School of Physics 93 (ELAF '93),
5-16 July 1993, Mar del Plata, Argentina); LATEX, 151 pages (15 figures not
included, available on request); SPhT T93/110; an updated version is
available at arXiv:hep-ph/0206003
|
Phys.Rept. 240 (1994) 1-142
|
10.1016/0370-1573(94)90002-7
| null |
hep-ph nucl-th
| null |
This article is based on a series of lectures given at ELAF 93 on the
description of low-energy hadronic systems {\it in and out} of hadronic medium.
The focus is put on identifying, with the help of a Cheshire Cat philosophy,
the effective degrees of freedom relevant for the strong interactions from a
certain number of generic symmetry properties of QCD. The matters treated are
the ground-state and excited-state properties of light- and heavy-quark baryons
and applications to nuclei and nuclear matter under normal as well as extreme
conditions.
|
[
{
"created": "Mon, 18 Oct 1993 04:25:52 GMT",
"version": "v1"
}
] |
2015-08-25
|
[
[
"Rho",
"Mannque",
"",
"SPhT/CEA Saclay"
]
] |
This article is based on a series of lectures given at ELAF 93 on the description of low-energy hadronic systems {\it in and out} of hadronic medium. The focus is put on identifying, with the help of a Cheshire Cat philosophy, the effective degrees of freedom relevant for the strong interactions from a certain number of generic symmetry properties of QCD. The matters treated are the ground-state and excited-state properties of light- and heavy-quark baryons and applications to nuclei and nuclear matter under normal as well as extreme conditions.
|
1008.5095
|
We-Fu Chang
|
We-Fu Chang, I-Ting Chen, and Siao-Cing Liou
|
Neutrino Masses via the Zee Mechanism in 5D split fermions model
|
16 pages, 2 figures
|
Phys.Rev.D83:025017,2011
|
10.1103/PhysRevD.83.025017
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We study the Zee model in the framework of the split fermion model in
$M_4\times S_1/Z_2$ spacetime. Neutrino masses are generated through 1-loop
diagrams without the right-handed neutrinos introduced. By assuming an order
one anarchical complex 5D Yukawa couplings, all the effective 4D Yukawa
couplings are determined by the wave function overlap between the split
fermions and the bulk scalars in the fifth dimension. The predictability of the
Yukawa couplings is in sharp contrast to the original Zee model in 4D where the
Yukawa couplings are unknown free parameters. This setup exhibits a geometrical
alternative to the lepton flavor symmetry. By giving four explicit sets of the
split fermion locations, we demonstrate that it is possible to simultaneously
fit the lepton masses and neutrino oscillation data by just a handful free
parameters without much fine tuning. Moreover, we are able to make definite
predictions for the mixing angle $\theta_{13}$, the absolute neutrino masses,
and the lepton flavor violation processes for each configuration.
|
[
{
"created": "Mon, 30 Aug 2010 15:21:51 GMT",
"version": "v1"
}
] |
2011-02-15
|
[
[
"Chang",
"We-Fu",
""
],
[
"Chen",
"I-Ting",
""
],
[
"Liou",
"Siao-Cing",
""
]
] |
We study the Zee model in the framework of the split fermion model in $M_4\times S_1/Z_2$ spacetime. Neutrino masses are generated through 1-loop diagrams without the right-handed neutrinos introduced. By assuming an order one anarchical complex 5D Yukawa couplings, all the effective 4D Yukawa couplings are determined by the wave function overlap between the split fermions and the bulk scalars in the fifth dimension. The predictability of the Yukawa couplings is in sharp contrast to the original Zee model in 4D where the Yukawa couplings are unknown free parameters. This setup exhibits a geometrical alternative to the lepton flavor symmetry. By giving four explicit sets of the split fermion locations, we demonstrate that it is possible to simultaneously fit the lepton masses and neutrino oscillation data by just a handful free parameters without much fine tuning. Moreover, we are able to make definite predictions for the mixing angle $\theta_{13}$, the absolute neutrino masses, and the lepton flavor violation processes for each configuration.
|
1901.09992
|
Ayuki Kamada
|
Shin'ichiro Ando, Ayuki Kamada, Toyokazu Sekiguchi, Tomo Takahashi
|
Smallest Halos in Thermal Wino Dark Matter
|
12 pages, 7 figures; matched to the PRD version, author list changed,
evaluation of the boost factor significantly improved
|
Phys. Rev. D 100, 123519 (2019)
|
10.1103/PhysRevD.100.123519
|
CTPU-PTC-19-01, RESCEU-1/19
|
hep-ph astro-ph.CO
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
(Mini) split supersymmetry explains the observed Higgs mass and evades
stringent constraints, while keeping good features of TeV-scale supersymmetry
other than the little hierarchy problem. Such scenarios naturally predict
thermal wino dark matter whose mass is around $3 \, {\rm TeV}$. Its
non-perturbatively enhanced annihilation is a promising target of indirect
detection experiments. It is known that identifying the smallest halos is
essential for reducing an uncertainty in interpreting indirect detection
experiments. Despite its importance, the smallest halos of thermal wino dark
matter have not been well understood and thus are investigated in this work. In
particular, we remark on two aspects: 1) the neutral wino is in kinetic
equilibrium with primordial plasma predominantly through inelastic processes
involving the slightly heavier charged wino; and 2) the resultant density
contrast shows larger powers at dark acoustic oscillation peaks than in cold
dark matter, which is known as an overshooting phenomenon. By taking them into
account, we provide a rigorous estimate of the boost factor. Our result
facilitates accurately pinning down thermal wino dark matter through vigorous
efforts in indirect detection experiments.
|
[
{
"created": "Mon, 28 Jan 2019 20:45:26 GMT",
"version": "v1"
},
{
"created": "Mon, 15 Apr 2019 05:51:22 GMT",
"version": "v2"
},
{
"created": "Mon, 23 Dec 2019 00:50:14 GMT",
"version": "v3"
}
] |
2019-12-24
|
[
[
"Ando",
"Shin'ichiro",
""
],
[
"Kamada",
"Ayuki",
""
],
[
"Sekiguchi",
"Toyokazu",
""
],
[
"Takahashi",
"Tomo",
""
]
] |
(Mini) split supersymmetry explains the observed Higgs mass and evades stringent constraints, while keeping good features of TeV-scale supersymmetry other than the little hierarchy problem. Such scenarios naturally predict thermal wino dark matter whose mass is around $3 \, {\rm TeV}$. Its non-perturbatively enhanced annihilation is a promising target of indirect detection experiments. It is known that identifying the smallest halos is essential for reducing an uncertainty in interpreting indirect detection experiments. Despite its importance, the smallest halos of thermal wino dark matter have not been well understood and thus are investigated in this work. In particular, we remark on two aspects: 1) the neutral wino is in kinetic equilibrium with primordial plasma predominantly through inelastic processes involving the slightly heavier charged wino; and 2) the resultant density contrast shows larger powers at dark acoustic oscillation peaks than in cold dark matter, which is known as an overshooting phenomenon. By taking them into account, we provide a rigorous estimate of the boost factor. Our result facilitates accurately pinning down thermal wino dark matter through vigorous efforts in indirect detection experiments.
|
0901.4243
|
Oleg Antipin A
|
Oleg Antipin, Kimmo Tuominen
|
Discriminating between technicolor and warped extra dimensional model
via pp $\to$ ZZ channel
|
16 pages, 3 figures, 1 table
|
Phys.Rev.D79:075011,2009
|
10.1103/PhysRevD.79.075011
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We explore the possibility to discriminate between certain strongly-coupled
technicolor (TC) models and warped extra-dimensional models where the Standard
Model fields are propagating in the extra dimension. We consider a generic
QCD-like TC model with running coupling as well as two TC models with walking
dynamics. We argue that due to the different production mechanisms for the
lowest-lying composite tensor state in these TC theories compared to the first
Kaluza-Klein graviton mode of warped extra-dimensional case, it is possible to
distinguish between these models based on the angular analysis of the
reconstructed longitudinal Z bosons in the $pp \to ZZ \to $ four charged
leptons channel.
|
[
{
"created": "Tue, 27 Jan 2009 13:16:55 GMT",
"version": "v1"
}
] |
2010-04-15
|
[
[
"Antipin",
"Oleg",
""
],
[
"Tuominen",
"Kimmo",
""
]
] |
We explore the possibility to discriminate between certain strongly-coupled technicolor (TC) models and warped extra-dimensional models where the Standard Model fields are propagating in the extra dimension. We consider a generic QCD-like TC model with running coupling as well as two TC models with walking dynamics. We argue that due to the different production mechanisms for the lowest-lying composite tensor state in these TC theories compared to the first Kaluza-Klein graviton mode of warped extra-dimensional case, it is possible to distinguish between these models based on the angular analysis of the reconstructed longitudinal Z bosons in the $pp \to ZZ \to $ four charged leptons channel.
|
hep-ph/0004189
|
Matthias Steinhauser
|
K.G. Chetyrkin, J.H. Kuehn and M. Steinhauser
|
RunDec: a Mathematica package for running and decoupling of the strong
coupling and quark masses
|
32 pages, ps figures included, accepted for publication in Computer
Physics Communications
|
Comput.Phys.Commun.133:43-65,2000
|
10.1016/S0010-4655(00)00155-7
|
DESY 00--034, TTP00--05
|
hep-ph
| null |
In this paper the formulae are collected which are needed for the computation
of the strong coupling constant and quark masses at different energy scales and
for different number of active flavours. All equations contain the
state-of-the-art QCD corrections up to three- and sometimes even four-loop
order. For the practical implementation {\tt Mathematica} is used and a package
containing useful procedures is provided.
|
[
{
"created": "Wed, 19 Apr 2000 17:14:37 GMT",
"version": "v1"
}
] |
2008-11-26
|
[
[
"Chetyrkin",
"K. G.",
""
],
[
"Kuehn",
"J. H.",
""
],
[
"Steinhauser",
"M.",
""
]
] |
In this paper the formulae are collected which are needed for the computation of the strong coupling constant and quark masses at different energy scales and for different number of active flavours. All equations contain the state-of-the-art QCD corrections up to three- and sometimes even four-loop order. For the practical implementation {\tt Mathematica} is used and a package containing useful procedures is provided.
|
2003.11729
|
Ya-Ping Xie
|
Ya-Ping Xie, Xu Cao, Yu-Tie Liang and Xurong Chen
|
Production of hidden-charm and hidden-bottom pentaquark states in
electron-proton collisions
| null |
Chin.Phys.C45 (2021) no.4,043105
|
10.1088/1674-1137/abdea9
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Electro-production of several pentaquark states is investigated in this
paper. eSTARlight package is adapted to study the electro-production of
$J/\psi$ and $\Upsilon (1S)$ via pentaquark $P_c$ and $P_b$ resonance channels
in $e p \to e eJ/\psi p$ and $e p \to e\Upsilon(1S) p$ scattering processes at
proposed electron-ion colliders (EICs). The results in this paper are compared
to the non-resonance $t$-channels, which is described in pomeron exchange model
in our studies. Some pseudo-rapidity distributions rapidity distributions of
$J/\psi$ and $\Upsilon(1S)$ are presented for proposed EICs including EicC and
EIC-US. It is found that EicC is a good platform to identify $P_b$ states in
the future.
|
[
{
"created": "Thu, 26 Mar 2020 03:36:24 GMT",
"version": "v1"
},
{
"created": "Fri, 27 Mar 2020 01:11:45 GMT",
"version": "v2"
},
{
"created": "Wed, 3 Jun 2020 08:33:38 GMT",
"version": "v3"
},
{
"created": "Fri, 25 Dec 2020 10:07:35 GMT",
"version": "v4"
},
{
"created": "Fri, 19 Mar 2021 10:10:41 GMT",
"version": "v5"
}
] |
2021-03-22
|
[
[
"Xie",
"Ya-Ping",
""
],
[
"Cao",
"Xu",
""
],
[
"Liang",
"Yu-Tie",
""
],
[
"Chen",
"Xurong",
""
]
] |
Electro-production of several pentaquark states is investigated in this paper. eSTARlight package is adapted to study the electro-production of $J/\psi$ and $\Upsilon (1S)$ via pentaquark $P_c$ and $P_b$ resonance channels in $e p \to e eJ/\psi p$ and $e p \to e\Upsilon(1S) p$ scattering processes at proposed electron-ion colliders (EICs). The results in this paper are compared to the non-resonance $t$-channels, which is described in pomeron exchange model in our studies. Some pseudo-rapidity distributions rapidity distributions of $J/\psi$ and $\Upsilon(1S)$ are presented for proposed EICs including EicC and EIC-US. It is found that EicC is a good platform to identify $P_b$ states in the future.
|
hep-ph/0408267
|
Zoltan Ligeti
|
Zoltan Ligeti
|
The CKM matrix and CP Violation
|
Plenary talk at 32nd International Conference on High Energy Physics
(ICHEP'04), August 16-22, 2004, Beijing, China. v2: Table 5 corrected, minor
changes in some averages (updated to hfag, that include correlations between
S and C). v3: Figure 8 fixed, minor final changes
|
Int.J.Mod.Phys.A20:5105-5118,2005
|
10.1142/S0217751X05028624
|
LBNL-55944
|
hep-ph hep-ex
| null |
The status of CP violation and the CKM matrix is reviewed. Direct CP
violation in B decay has been established and the measurement of sin(2beta) in
\psi K modes reached 5% accuracy. I discuss the implications of these, and of
the possible deviations of the CP asymmetries in b->s modes from that in \psi
K. The first meaningful measurements of alpha and gamma are explained, together
with their significance for constraining both the SM and new physics in B-Bbar
mixing. I also discuss implications of recent developments in the theory of
nonleptonic decays for B->pi K rates and CP asymmetries, and for the
polarization in charmless B decays to two vector mesons.
|
[
{
"created": "Tue, 24 Aug 2004 22:21:08 GMT",
"version": "v1"
},
{
"created": "Tue, 14 Sep 2004 04:04:00 GMT",
"version": "v2"
},
{
"created": "Fri, 8 Oct 2004 16:13:01 GMT",
"version": "v3"
}
] |
2014-11-17
|
[
[
"Ligeti",
"Zoltan",
""
]
] |
The status of CP violation and the CKM matrix is reviewed. Direct CP violation in B decay has been established and the measurement of sin(2beta) in \psi K modes reached 5% accuracy. I discuss the implications of these, and of the possible deviations of the CP asymmetries in b->s modes from that in \psi K. The first meaningful measurements of alpha and gamma are explained, together with their significance for constraining both the SM and new physics in B-Bbar mixing. I also discuss implications of recent developments in the theory of nonleptonic decays for B->pi K rates and CP asymmetries, and for the polarization in charmless B decays to two vector mesons.
|
1202.0826
|
Dennis D. Dietrich
|
Dennis D. Dietrich, Paul Hoyer, and Matti Jarvinen
|
Boosting equal time bound states
|
13 pages, no figures
| null |
10.1103/PhysRevD.85.105016
|
CCTP-2012-01 HIP-2012-04/TH
|
hep-ph hep-th nucl-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We present an explicit and exact boost of a relativistic bound state defined
at equal time of the constituents in the Born approximation (lowest order in
hbar). To this end, we construct the Poincar\'e generators of QED and QCD in
D=1+1 dimensions, using Gauss' law to express A^0 in terms of the fermion
fields in A^1=0 gauge. We determine the fermion-antifermion bound states in the
Born approximation as eigenstates of the time and space translation generators
P^0 and P^1. The boost operator is combined with a gauge transformation so as
to maintain the gauge condition A^1=0 in the new frame. We verify that the
boosted state remains an eigenstate of P^0 and P^1 with appropriately
transformed eigenvalues and determine the transformation law of the equal-time,
relativistic wave function. The shape of the wave function is independent of
the CM momentum when expressed in terms of a variable, which is quadratically
related to the distance x between the fermions. As a consequence, the Lorentz
contraction of the wave function is proportional to 1/(E-V(x)) and thus depends
on x via the linear potential V(x).
|
[
{
"created": "Fri, 3 Feb 2012 21:03:53 GMT",
"version": "v1"
}
] |
2013-05-30
|
[
[
"Dietrich",
"Dennis D.",
""
],
[
"Hoyer",
"Paul",
""
],
[
"Jarvinen",
"Matti",
""
]
] |
We present an explicit and exact boost of a relativistic bound state defined at equal time of the constituents in the Born approximation (lowest order in hbar). To this end, we construct the Poincar\'e generators of QED and QCD in D=1+1 dimensions, using Gauss' law to express A^0 in terms of the fermion fields in A^1=0 gauge. We determine the fermion-antifermion bound states in the Born approximation as eigenstates of the time and space translation generators P^0 and P^1. The boost operator is combined with a gauge transformation so as to maintain the gauge condition A^1=0 in the new frame. We verify that the boosted state remains an eigenstate of P^0 and P^1 with appropriately transformed eigenvalues and determine the transformation law of the equal-time, relativistic wave function. The shape of the wave function is independent of the CM momentum when expressed in terms of a variable, which is quadratically related to the distance x between the fermions. As a consequence, the Lorentz contraction of the wave function is proportional to 1/(E-V(x)) and thus depends on x via the linear potential V(x).
|
hep-ph/0510264
|
Edmond Iancu
|
E. Iancu
|
From high-energy QCD to statistical physics
|
Invited talk at the XIth International Conference on Elastic and
Diffractive Scattering, Blois, France, May 15 - 20, 2005; 7 pages, 4 figures
| null | null |
SPhT-T05/164
|
hep-ph
| null |
I discuss recent progress in understanding the high-energy evolution in QCD,
which points towards a remarkable correspondence with the reaction-diffusion
problem of statistical physics. This enables us to determine the asymptotic
behaviour of the scattering amplitudes in QCD.
|
[
{
"created": "Thu, 20 Oct 2005 12:44:39 GMT",
"version": "v1"
}
] |
2007-05-23
|
[
[
"Iancu",
"E.",
""
]
] |
I discuss recent progress in understanding the high-energy evolution in QCD, which points towards a remarkable correspondence with the reaction-diffusion problem of statistical physics. This enables us to determine the asymptotic behaviour of the scattering amplitudes in QCD.
|
hep-ph/0505172
|
Matteo Beccaria
|
Matteo Beccaria, Edoardo Mirabella
|
Supersymmetric structure of electroweak Sudakov corrections
|
22 pages, 7 eps figures
|
Phys.Rev. D71 (2005) 115016
|
10.1103/PhysRevD.71.115016
| null |
hep-ph
| null |
Electroweak radiative corrections can be evaluated in the Sudakov
approximation, a systematic high energy expansion known to be relevant for the
analysis of future collider experiments in the TeV energy range. In the Minimal
Supersymmetric Standard Model and at next-to-leading order, Sudakov electroweak
corrections satisfy remarkable relations at the one loop level. Explicit
computations in component fields are available for various different $2\to 2$
processes relevant for Linear Collider or LHC physics. The Sudakov corrections
turn out to be equal or closely related in several classes of processes
differing by the replacement of certain final or initial states with their
superpartners. This fact suggests that supersymmetry is partially restored at
high-energy. We analyze the supersymmetric structure of such relations by
computing the Sudakov corrections in the framework of superfield perturbation
theory. As a simple application, we derive in full details an extended complete
set of supersymmetric relations among different processes related by
supersymmetry to the fundamental fermion pair production process $e^+e^-\to
f\bar f$.
|
[
{
"created": "Thu, 19 May 2005 10:05:50 GMT",
"version": "v1"
}
] |
2009-11-11
|
[
[
"Beccaria",
"Matteo",
""
],
[
"Mirabella",
"Edoardo",
""
]
] |
Electroweak radiative corrections can be evaluated in the Sudakov approximation, a systematic high energy expansion known to be relevant for the analysis of future collider experiments in the TeV energy range. In the Minimal Supersymmetric Standard Model and at next-to-leading order, Sudakov electroweak corrections satisfy remarkable relations at the one loop level. Explicit computations in component fields are available for various different $2\to 2$ processes relevant for Linear Collider or LHC physics. The Sudakov corrections turn out to be equal or closely related in several classes of processes differing by the replacement of certain final or initial states with their superpartners. This fact suggests that supersymmetry is partially restored at high-energy. We analyze the supersymmetric structure of such relations by computing the Sudakov corrections in the framework of superfield perturbation theory. As a simple application, we derive in full details an extended complete set of supersymmetric relations among different processes related by supersymmetry to the fundamental fermion pair production process $e^+e^-\to f\bar f$.
|
1705.05136
|
Andrey Pikelner
|
B.A. Kniehl, A.F. Pikelner, O.L. Veretin
|
Three-loop massive tadpoles and polylogarithms through weight six
|
26 pages, 4 ancillary files, v3: version published in JHEP: minor
additions, file with results for massive three-loop form-factor integrals
added
|
JHEP 1708 (2017) 024
|
10.1007/JHEP08(2017)024
|
DESY 17-070
|
hep-ph hep-th
|
http://creativecommons.org/licenses/by/4.0/
|
We evaluate the three-loop massive vacuum bubble diagrams in terms of
polylogarithms up to weight six. We also construct the basis of irrational
constants being harmonic polylgarithms of arguments $e^{k i \pi/3}$.
|
[
{
"created": "Mon, 15 May 2017 09:44:21 GMT",
"version": "v1"
},
{
"created": "Sun, 2 Jul 2017 21:01:19 GMT",
"version": "v2"
},
{
"created": "Thu, 17 Aug 2017 09:40:44 GMT",
"version": "v3"
}
] |
2017-08-18
|
[
[
"Kniehl",
"B. A.",
""
],
[
"Pikelner",
"A. F.",
""
],
[
"Veretin",
"O. L.",
""
]
] |
We evaluate the three-loop massive vacuum bubble diagrams in terms of polylogarithms up to weight six. We also construct the basis of irrational constants being harmonic polylgarithms of arguments $e^{k i \pi/3}$.
|
2406.07508
|
Shashank Bhatnagar Dr.
|
Shashank Bhatnagar and Hluf Negash
|
$(J/\psi, J/\psi)$, and $(\eta_c, \eta_c)$ production through two
intermediate photons in electron-positron annihilation at B-factories
|
14 pages, 1 figure
| null | null |
CERN-TH-2024-081
|
hep-ph
|
http://creativecommons.org/licenses/by/4.0/
|
We study the processes, $e^- e^+ \rightarrow \gamma^* \gamma^* \rightarrow
J/\psi +J/\psi$, and $e^- e^+ \rightarrow \gamma^* \gamma^* \rightarrow \eta_c+
\eta_c$ at $\sqrt{s}=10.6$ GeV in the framework of $4\times 4$ Bethe-Salpeter
equation. For $J/\psi+J/\psi$ production, the dominant contribution is through
fragmentation process, while for $\eta_c+\eta_c$ production, the quark
rearrangement diagrams contribute. Our results of cross section for
$J/\psi+J/\psi$ and $\psi(2S)+\psi(2S)$ are compatible with the experimental
upper limits set by Belle Collaboration, while in the absence of experimental
data for $\eta_c(1S)+\eta_c(1S)$, and $\eta_c(2S)+\eta_c(2S)$ production, we
have given theoretical prediction of their cross sections, and compared with
NRQCD prediction.
|
[
{
"created": "Tue, 11 Jun 2024 17:41:31 GMT",
"version": "v1"
}
] |
2024-06-12
|
[
[
"Bhatnagar",
"Shashank",
""
],
[
"Negash",
"Hluf",
""
]
] |
We study the processes, $e^- e^+ \rightarrow \gamma^* \gamma^* \rightarrow J/\psi +J/\psi$, and $e^- e^+ \rightarrow \gamma^* \gamma^* \rightarrow \eta_c+ \eta_c$ at $\sqrt{s}=10.6$ GeV in the framework of $4\times 4$ Bethe-Salpeter equation. For $J/\psi+J/\psi$ production, the dominant contribution is through fragmentation process, while for $\eta_c+\eta_c$ production, the quark rearrangement diagrams contribute. Our results of cross section for $J/\psi+J/\psi$ and $\psi(2S)+\psi(2S)$ are compatible with the experimental upper limits set by Belle Collaboration, while in the absence of experimental data for $\eta_c(1S)+\eta_c(1S)$, and $\eta_c(2S)+\eta_c(2S)$ production, we have given theoretical prediction of their cross sections, and compared with NRQCD prediction.
|
1712.05664
|
Zhi-Gang Wang
|
Zhi-Gang Wang
|
The magnetic moment of the $Z_c(3900)$ as an axialvector tetraquark
state with QCD sum rules
|
13 pages, 5 figures
|
Eur. Phys. J. C78 (2018) 297
|
10.1140/epjc/s10052-018-5794-0
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
In this article, we assign the $Z_c^\pm(3900)$ to be the diquark-antidiquark
type axialvector tetraquark state, study its magnetic moment with the QCD sum
rules in the external weak electromagnetic field by carrying out the operator
product expansion up to the vacuum condensates of dimension 8. We pay special
attention to matching the hadron side with the QCD side of the correlation
function to obtain solid duality, the routine can be applied to study other
electromagnetic properties of the exotic particles.
|
[
{
"created": "Fri, 15 Dec 2017 13:30:15 GMT",
"version": "v1"
},
{
"created": "Mon, 29 Jan 2018 13:26:09 GMT",
"version": "v2"
},
{
"created": "Wed, 28 Feb 2018 02:40:35 GMT",
"version": "v3"
}
] |
2018-04-18
|
[
[
"Wang",
"Zhi-Gang",
""
]
] |
In this article, we assign the $Z_c^\pm(3900)$ to be the diquark-antidiquark type axialvector tetraquark state, study its magnetic moment with the QCD sum rules in the external weak electromagnetic field by carrying out the operator product expansion up to the vacuum condensates of dimension 8. We pay special attention to matching the hadron side with the QCD side of the correlation function to obtain solid duality, the routine can be applied to study other electromagnetic properties of the exotic particles.
|
0903.1037
|
Neal Weiner
|
Douglas P. Finkbeiner, Tracy Slatyer, Neal Weiner, Itay Yavin
|
PAMELA, DAMA, INTEGRAL and Signatures of Metastable Excited WIMPs
|
22 pages, 7 figures
|
JCAP 0909:037,2009
|
10.1088/1475-7516/2009/09/037
| null |
hep-ph astro-ph.HE
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Models of dark matter with ~ GeV scale force mediators provide attractive
explanations of many high energy anomalies, including PAMELA, ATIC, and the
WMAP haze. At the same time, by exploiting the ~ MeV scale excited states that
are automatically present in such theories, these models naturally explain the
DAMA/LIBRA and INTEGRAL signals through the inelastic dark matter (iDM) and
exciting dark matter (XDM) scenarios, respectively. Interestingly, with only
weak kinetic mixing to hypercharge to mediate decays, the lifetime of excited
states with delta < 2 m_e is longer than the age of the universe. The
fractional relic abundance of these excited states depends on the temperature
of kinetic decoupling, but can be appreciable. There could easily be other
mechanisms for rapid decay, but the consequences of such long-lived states are
intriguing. We find that CDMS constrains the fractional relic population of
~100 keV states to be <~ 10^-2, for a 1 TeV WIMP with sigma_n = 10^-40 cm^2.
Upcoming searches at CDMS, as well as xenon, silicon, and argon targets, can
push this limit significantly lower. We also consider the possibility that the
DAMA excitation occurs from a metastable state into the XDM state, which decays
via e+e- emission, which allows lighter states to explain the INTEGRAL signal
due to the small kinetic energies required. Such models yield dramatic signals
from down-scattering, with spectra peaking at high energies, sometimes as high
as ~1 MeV, well outside the usual search windows. Such signals would be visible
at future Ar and Si experiments, and may be visible at Ge and Xe experiments.
We also consider other XDM models involving ~ 500 keV metastable states, and
find they can allow lighter WIMPs to explain INTEGRAL as well.
|
[
{
"created": "Thu, 5 Mar 2009 18:00:42 GMT",
"version": "v1"
},
{
"created": "Thu, 25 Jun 2009 18:03:54 GMT",
"version": "v2"
}
] |
2009-10-02
|
[
[
"Finkbeiner",
"Douglas P.",
""
],
[
"Slatyer",
"Tracy",
""
],
[
"Weiner",
"Neal",
""
],
[
"Yavin",
"Itay",
""
]
] |
Models of dark matter with ~ GeV scale force mediators provide attractive explanations of many high energy anomalies, including PAMELA, ATIC, and the WMAP haze. At the same time, by exploiting the ~ MeV scale excited states that are automatically present in such theories, these models naturally explain the DAMA/LIBRA and INTEGRAL signals through the inelastic dark matter (iDM) and exciting dark matter (XDM) scenarios, respectively. Interestingly, with only weak kinetic mixing to hypercharge to mediate decays, the lifetime of excited states with delta < 2 m_e is longer than the age of the universe. The fractional relic abundance of these excited states depends on the temperature of kinetic decoupling, but can be appreciable. There could easily be other mechanisms for rapid decay, but the consequences of such long-lived states are intriguing. We find that CDMS constrains the fractional relic population of ~100 keV states to be <~ 10^-2, for a 1 TeV WIMP with sigma_n = 10^-40 cm^2. Upcoming searches at CDMS, as well as xenon, silicon, and argon targets, can push this limit significantly lower. We also consider the possibility that the DAMA excitation occurs from a metastable state into the XDM state, which decays via e+e- emission, which allows lighter states to explain the INTEGRAL signal due to the small kinetic energies required. Such models yield dramatic signals from down-scattering, with spectra peaking at high energies, sometimes as high as ~1 MeV, well outside the usual search windows. Such signals would be visible at future Ar and Si experiments, and may be visible at Ge and Xe experiments. We also consider other XDM models involving ~ 500 keV metastable states, and find they can allow lighter WIMPs to explain INTEGRAL as well.
|
hep-ph/9612366
|
Michael Lublinsky
|
I. Halperin (U. of British Columbia, Vancouver) and M. Lublinsky
(Technion, Haifa)
|
Inclusive B \to sg decay in QCD
|
RevTex file, 3 pages and 2 poscript pictures
|
Phys.Rev. D56 (1997) 512-514
|
10.1103/PhysRevD.56.512
| null |
hep-ph
| null |
The inclusive nonleptonic transition rate of B meson in gluonic penguin
channel is calculated in QCD using the heavy quark mass expansion. We found the
branching ratio to be approximately 0.25%.
|
[
{
"created": "Sun, 15 Dec 1996 15:32:54 GMT",
"version": "v1"
}
] |
2009-10-30
|
[
[
"Halperin",
"I.",
"",
"U. of British Columbia, Vancouver"
],
[
"Lublinsky",
"M.",
"",
"Technion, Haifa"
]
] |
The inclusive nonleptonic transition rate of B meson in gluonic penguin channel is calculated in QCD using the heavy quark mass expansion. We found the branching ratio to be approximately 0.25%.
|
1007.0490
|
Ennio Salvioni
|
Ennio Salvioni
|
Minimal Z' models and the early LHC
|
6 pages, 2 figures. Talk given at the 2nd Young Researchers Workshop
"Physics Challenges in the LHC Era", Frascati, May 10 and 13, 2010
| null | null | null |
hep-ph hep-ex
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We consider a class of minimal extensions of the Standard Model with an extra
massive neutral gauge boson Z'. They include both family-universal models,
where the extra U(1) is associated with (B-L), and non-universal models where
the Z' is coupled to a non-trivial linear combination of B and the lepton
flavours. After giving an estimate of the range of parameters compatible with a
Grand Unified Theory, we present the current experimental bounds, discussing
the interplay between electroweak precision tests and direct searches at the
Tevatron. Finally, we assess the discovery potential of the early LHC.
|
[
{
"created": "Sat, 3 Jul 2010 10:22:31 GMT",
"version": "v1"
}
] |
2010-07-06
|
[
[
"Salvioni",
"Ennio",
""
]
] |
We consider a class of minimal extensions of the Standard Model with an extra massive neutral gauge boson Z'. They include both family-universal models, where the extra U(1) is associated with (B-L), and non-universal models where the Z' is coupled to a non-trivial linear combination of B and the lepton flavours. After giving an estimate of the range of parameters compatible with a Grand Unified Theory, we present the current experimental bounds, discussing the interplay between electroweak precision tests and direct searches at the Tevatron. Finally, we assess the discovery potential of the early LHC.
|
hep-ph/0508054
|
Paride Paradisi
|
Paride Paradisi
|
Higgs-Mediated tau --> mu and tau --> e transitions in II Higgs doublet
Model and Supersymmetry
|
v2=published version: 13 pages, 4 figures, text improved and
reference added. Two loop effects (relevant for tau->l_jgamma) added.
Conclusions unchanged
|
JHEP 0602 (2006) 050
|
10.1088/1126-6708/2006/02/050
| null |
hep-ph
| null |
We study the phenomenology of the mu-tau and e-tau lepton flavour violation
(LFV) in a general two Higgs Doublet Model (2HDM) including the supersymmetric
case. We consider several LFV decay modes of the charged fermion tau, namely
tau-> l_jgamma, tau->l_j l_k l_k and tau-> l_jeta. The predictions and the
correlations among the rates of the above processes are computed. In
particular, it is shown that tau->l_jgamma processes are the most sensitive
channels to Higgs-mediated LFV specially if the splitting among the neutral
Higgs bosons masses is not below the 10% level.
|
[
{
"created": "Thu, 4 Aug 2005 12:33:49 GMT",
"version": "v1"
},
{
"created": "Fri, 24 Mar 2006 14:26:27 GMT",
"version": "v2"
}
] |
2009-11-11
|
[
[
"Paradisi",
"Paride",
""
]
] |
We study the phenomenology of the mu-tau and e-tau lepton flavour violation (LFV) in a general two Higgs Doublet Model (2HDM) including the supersymmetric case. We consider several LFV decay modes of the charged fermion tau, namely tau-> l_jgamma, tau->l_j l_k l_k and tau-> l_jeta. The predictions and the correlations among the rates of the above processes are computed. In particular, it is shown that tau->l_jgamma processes are the most sensitive channels to Higgs-mediated LFV specially if the splitting among the neutral Higgs bosons masses is not below the 10% level.
|
2209.14493
|
Ya-Ping Xie
|
S. V. Goloskokov, Ya-Ping Xie and Xurong Chen
|
Study of transversity GPDs from pseudoscalar mesons production at EIC of
China
| null |
Commun. Theor. Phys. 75 (2023) 065201
|
10.1088/1572-9494/acc793
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
The exclusive $\eta$ and $\pi^0$ electroproduction is studied in the handbag
approach based on Generalized Parton Distributions (GPDs) factorization.
Predictions of $\pi^0$ and $\eta$ mesons are calculated for future Electron-Ion
Collider of China (EicC) energy range using obtained cross sections we extract
information on the transversity GPDs contributions to these processes.
|
[
{
"created": "Thu, 29 Sep 2022 01:11:46 GMT",
"version": "v1"
}
] |
2023-06-01
|
[
[
"Goloskokov",
"S. V.",
""
],
[
"Xie",
"Ya-Ping",
""
],
[
"Chen",
"Xurong",
""
]
] |
The exclusive $\eta$ and $\pi^0$ electroproduction is studied in the handbag approach based on Generalized Parton Distributions (GPDs) factorization. Predictions of $\pi^0$ and $\eta$ mesons are calculated for future Electron-Ion Collider of China (EicC) energy range using obtained cross sections we extract information on the transversity GPDs contributions to these processes.
|
hep-ph/9901454
|
Peter Watson
|
Peter Watson (Durham)
|
Perturbative Constraints on the Slavnov-Taylor Identity for the
Ghost-Gluon Vertex in QCD
|
8 pages plain Latex, 1 eps-figure
| null | null |
DTP-99/04
|
hep-ph
| null |
A recent form of the Slavnov-Taylor identity for the ghost-gluon vertex of
QCD is compared with perturbative results. It is found that this identity,
derived assuming ghost-ghost scattering can be neglected, is not consistent
with perturbation theory. A new identity is derived at the one-loop
perturbative level.
|
[
{
"created": "Fri, 29 Jan 1999 18:17:20 GMT",
"version": "v1"
}
] |
2007-05-23
|
[
[
"Watson",
"Peter",
"",
"Durham"
]
] |
A recent form of the Slavnov-Taylor identity for the ghost-gluon vertex of QCD is compared with perturbative results. It is found that this identity, derived assuming ghost-ghost scattering can be neglected, is not consistent with perturbation theory. A new identity is derived at the one-loop perturbative level.
|
1811.01581
|
Santi Peris
|
D. Boito, M. Golterman, K. Maltman and S. Peris
|
Determining $\alpha_s$ from hadronic $\tau$ decay: the pitfalls of
truncating the OPE
|
15 pages, 4 figures, contribution to the proceedings for the 15th
International Workshop on Tau Lepton Physics, Amsterdam, The Netherlands,
Sept. 2018
| null | null | null |
hep-ph hep-lat nucl-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We discuss sum-rule determinations of $\alpha_s$ from non-strange hadronic
$\tau$-decay data. We investigate, in particular, the reliability of the
assumptions underlying the "truncated OPE strategy," which specifies a certain
treatment of non-perturbative contributions, and which was employed in Refs.
[1-3]. Here, we test this strategy by applying the strategy to the $R$-ratio
obtained from $e^+e^-$ data, which extend beyond the $\tau$ mass, and, based on
the outcome of these tests, we demonstrate the failure of this strategy.We then
present a brief overview of new results on the form of duality-violating
non-perturbative contributions, which are conspicuously present in the
experimentally determined spectral functions. As we show, with the current
precision claimed for the extraction of $\alpha_s$, including a representation
of duality violations is unavoidable if one wishes to avoid uncontrolled
theoretical errors.
|
[
{
"created": "Mon, 5 Nov 2018 10:02:52 GMT",
"version": "v1"
}
] |
2018-11-06
|
[
[
"Boito",
"D.",
""
],
[
"Golterman",
"M.",
""
],
[
"Maltman",
"K.",
""
],
[
"Peris",
"S.",
""
]
] |
We discuss sum-rule determinations of $\alpha_s$ from non-strange hadronic $\tau$-decay data. We investigate, in particular, the reliability of the assumptions underlying the "truncated OPE strategy," which specifies a certain treatment of non-perturbative contributions, and which was employed in Refs. [1-3]. Here, we test this strategy by applying the strategy to the $R$-ratio obtained from $e^+e^-$ data, which extend beyond the $\tau$ mass, and, based on the outcome of these tests, we demonstrate the failure of this strategy.We then present a brief overview of new results on the form of duality-violating non-perturbative contributions, which are conspicuously present in the experimentally determined spectral functions. As we show, with the current precision claimed for the extraction of $\alpha_s$, including a representation of duality violations is unavoidable if one wishes to avoid uncontrolled theoretical errors.
|
hep-ph/0210070
|
Roberto Ugoccioni
|
R. Ugoccioni, A. Giovannini
|
Power series distributions in clan structure analysis: new observables
in strong interactions
|
9 pages, 2 figures, talk presented by R. Ugoccioni at "Correlations
and Fluctuations 2002", Crete, Greece, 8-15 June 2002
| null |
10.1142/9789812704641_0011
|
DFTT 30/2002
|
hep-ph
| null |
We present a new thermodynamical approach to multiparticle production in high
energy hadronic interactions, making use of the formalism of infinitely
divisible power series distributions. This approach allows us to define new
observables, linked to the system fugacity, which characterise different
classes of events.
|
[
{
"created": "Fri, 4 Oct 2002 09:13:29 GMT",
"version": "v1"
}
] |
2017-08-23
|
[
[
"Ugoccioni",
"R.",
""
],
[
"Giovannini",
"A.",
""
]
] |
We present a new thermodynamical approach to multiparticle production in high energy hadronic interactions, making use of the formalism of infinitely divisible power series distributions. This approach allows us to define new observables, linked to the system fugacity, which characterise different classes of events.
|
2004.11348
|
Gerhard Buchalla
|
G. Buchalla, O. Cata, A. Celis, M. Knecht, C. Krause
|
Higgs-Electroweak Chiral Lagrangian: One-Loop Renormalization Group
Equations
|
37 pages, no figures
|
Phys. Rev. D 104, 076005 (2021)
|
10.1103/PhysRevD.104.076005
|
LMU-ASC~13/20, SI-HEP-2020-08, P3H-20-012, FERMILAB-PUB-20-140-T
|
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Starting from the one-loop divergences we obtained previously, we work out
the renormalization of the Higgs-Electroweak Chiral Lagrangian explicitly and
in detail. This includes the renormalization of the lowest-order Lagrangian, as
well as the decomposition of the remaining divergences into a complete basis of
next-to-leading-order counterterms. We provide the list of the corresponding
beta functions. We show how our results match the one-loop renormalization of
some of the dimension-6 operators in SMEFT. We further point out differences
with related work in the literature and discuss them. As an application of the
obtained results, we evaluate the divergences of the vacuum expectation value
of the Higgs field at one loop and show that they can be appropriately removed
by the corresponding renormalization. We also work out the finite
renormalization required to keep the no-tadpole condition on the Higgs field at
one loop.
|
[
{
"created": "Thu, 23 Apr 2020 17:47:22 GMT",
"version": "v1"
}
] |
2021-10-13
|
[
[
"Buchalla",
"G.",
""
],
[
"Cata",
"O.",
""
],
[
"Celis",
"A.",
""
],
[
"Knecht",
"M.",
""
],
[
"Krause",
"C.",
""
]
] |
Starting from the one-loop divergences we obtained previously, we work out the renormalization of the Higgs-Electroweak Chiral Lagrangian explicitly and in detail. This includes the renormalization of the lowest-order Lagrangian, as well as the decomposition of the remaining divergences into a complete basis of next-to-leading-order counterterms. We provide the list of the corresponding beta functions. We show how our results match the one-loop renormalization of some of the dimension-6 operators in SMEFT. We further point out differences with related work in the literature and discuss them. As an application of the obtained results, we evaluate the divergences of the vacuum expectation value of the Higgs field at one loop and show that they can be appropriately removed by the corresponding renormalization. We also work out the finite renormalization required to keep the no-tadpole condition on the Higgs field at one loop.
|
1712.03467
|
Yang Li
|
Yang Li, Pieter Maris and James Vary
|
Frame dependence of form factors in light-front dynamics
|
13 pages, 21 figures. Submitted to Phys. Rev. D
|
Phys. Rev. D 97, 054034 (2018)
|
10.1103/PhysRevD.97.054034
| null |
hep-ph nucl-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
In light-front dynamics, form factors are traditionally computed with the
"good current" $J^+$ within the Drell-Yan frame $q^+=0$. Due to truncations
imposed in practical calculations, the from factor may acquire frame
dependence, which is often neglected. In this work, we explore the form factors
in more general frames, preserving the boost covariance. We find the frame
dependence of the elastic form factors for mesons is small in basis light-front
holography and related models with two-body Fock space truncation. We suggest
to use the difference between form factor results from Drell-Yan frame and the
"longitudinal frame" as a metric for the violation of the Lorentz symmetry due
to Fock space truncation.
|
[
{
"created": "Sun, 10 Dec 2017 02:52:52 GMT",
"version": "v1"
},
{
"created": "Mon, 18 Dec 2017 02:35:56 GMT",
"version": "v2"
},
{
"created": "Fri, 30 Mar 2018 02:10:04 GMT",
"version": "v3"
}
] |
2018-04-02
|
[
[
"Li",
"Yang",
""
],
[
"Maris",
"Pieter",
""
],
[
"Vary",
"James",
""
]
] |
In light-front dynamics, form factors are traditionally computed with the "good current" $J^+$ within the Drell-Yan frame $q^+=0$. Due to truncations imposed in practical calculations, the from factor may acquire frame dependence, which is often neglected. In this work, we explore the form factors in more general frames, preserving the boost covariance. We find the frame dependence of the elastic form factors for mesons is small in basis light-front holography and related models with two-body Fock space truncation. We suggest to use the difference between form factor results from Drell-Yan frame and the "longitudinal frame" as a metric for the violation of the Lorentz symmetry due to Fock space truncation.
|
hep-ph/0409122
|
Steffen Schumann
|
T. Gleisberg, S. Hoeche, F. Krauss, A. Schaelicke, S. Schumann, G.
Soff and J. Winter
|
Predictions for multi-particle final states with SHERPA
|
Talk given by S. Schumann at Physics at LHC, 13-17 July, 2004,
Vienna, Austria. 8 pages, 4 figures
|
Czech.J.Phys.55:B529-B536,2005
| null | null |
hep-ph
| null |
In this contribution the new event generation framework SHERPA will be
presented, which aims at a full simulation of events at current and future
high-energy experiments. Some first results related to the production of weak
vector bosons in association with jets at the Tevatron and the LHC will be
discussed.
|
[
{
"created": "Fri, 10 Sep 2004 15:35:37 GMT",
"version": "v1"
}
] |
2008-12-18
|
[
[
"Gleisberg",
"T.",
""
],
[
"Hoeche",
"S.",
""
],
[
"Krauss",
"F.",
""
],
[
"Schaelicke",
"A.",
""
],
[
"Schumann",
"S.",
""
],
[
"Soff",
"G.",
""
],
[
"Winter",
"J.",
""
]
] |
In this contribution the new event generation framework SHERPA will be presented, which aims at a full simulation of events at current and future high-energy experiments. Some first results related to the production of weak vector bosons in association with jets at the Tevatron and the LHC will be discussed.
|
1106.5377
|
Vladimir Koutvitsky
|
Vladimir A. Koutvitsky and Eugene M. Maslov
|
Gravipulsons
|
7 pages, 7 figures; Matches version published in Phys. Rev. D
|
Phys.Rev.D83:124028,2011
|
10.1103/PhysRevD.83.124028
| null |
hep-ph gr-qc nlin.PS
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We search for self-gravitating oscillating field lumps (pulsons) in the
scalar model with logarithmic potential. With the use of a
Krylov-Bogoliubov-type asymptotic expansion in the gravitational constant, the
pulson solutions of the Einstein-Klein-Gordon system are obtained in the
Schwarzschild coordinates. They are expressed in terms of solutions of the
singular Hill's equation. The masses of the obtained pulsons are calculated.
The initial conditions are found under which the pulson solutions become
periodic. These conditions are then used in direct numerical integration of the
Einstein-Klein-Gordon system. It is shown that they do evolve into a very
long-lived periodic pulson. Stability of the self-gravitating pulsons and their
possible astrophysical applications are briefly discussed.
|
[
{
"created": "Mon, 27 Jun 2011 12:43:18 GMT",
"version": "v1"
}
] |
2011-06-28
|
[
[
"Koutvitsky",
"Vladimir A.",
""
],
[
"Maslov",
"Eugene M.",
""
]
] |
We search for self-gravitating oscillating field lumps (pulsons) in the scalar model with logarithmic potential. With the use of a Krylov-Bogoliubov-type asymptotic expansion in the gravitational constant, the pulson solutions of the Einstein-Klein-Gordon system are obtained in the Schwarzschild coordinates. They are expressed in terms of solutions of the singular Hill's equation. The masses of the obtained pulsons are calculated. The initial conditions are found under which the pulson solutions become periodic. These conditions are then used in direct numerical integration of the Einstein-Klein-Gordon system. It is shown that they do evolve into a very long-lived periodic pulson. Stability of the self-gravitating pulsons and their possible astrophysical applications are briefly discussed.
|
0904.0946
|
Maxim Chernodub
|
M.N. Chernodub, Atsushi Nakamura, V.I.Zakharov
|
Deconfinement phase transition in mirror of symmetries
|
7 pages, RevTeX 4.0
| null | null |
ITEP-LAT/2009-01
|
hep-ph hep-lat hep-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We summarize and extend evidence that the deconfinement phase transition in
Yang-Mills theories can be viewed as change of effective non-perturbative
degrees of freedom and of symmetries of their interactions. In short, the
strings in four dimensions (4d) at temperatures below the critical temperature
Tc are replaced by particles, or field theories in 3d at T>Tc. The picture
emerges within various approaches based, in particular, on dual models, lattice
data and field theoretic models. We concentrate mostly on the lattice data, or
on the language of quantum geometry.
|
[
{
"created": "Mon, 6 Apr 2009 15:04:57 GMT",
"version": "v1"
}
] |
2009-04-09
|
[
[
"Chernodub",
"M. N.",
""
],
[
"Nakamura",
"Atsushi",
""
],
[
"Zakharov",
"V. I.",
""
]
] |
We summarize and extend evidence that the deconfinement phase transition in Yang-Mills theories can be viewed as change of effective non-perturbative degrees of freedom and of symmetries of their interactions. In short, the strings in four dimensions (4d) at temperatures below the critical temperature Tc are replaced by particles, or field theories in 3d at T>Tc. The picture emerges within various approaches based, in particular, on dual models, lattice data and field theoretic models. We concentrate mostly on the lattice data, or on the language of quantum geometry.
|
2101.11119
|
Carlos Andr\'es Florez
|
Andr\'es Fl\'orez, Alfredo Gurrola, Will Johns, Paul Sheldon, Elijah
Sheridan, Kuver Sinha, Brandon Soubasis
|
Probing axion-like particles with $\gamma \gamma$ final states from
vector boson fusion processes at the LHC
|
9 pages, 5 figures
|
Phys. Rev. D 103, 095001 (2021)
|
10.1103/PhysRevD.103.095001
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We perform a feasibility study to search for axion-like particles (ALPs)
using vector boson fusion (VBF) processes at the LHC. We work in an effective
field theory framework with cutoff scale $\Lambda$ and ALP mass $m_{a}$, and
assume that ALPs couple to photons with strength $\propto 1/\Lambda$. Assuming
proton-proton collisions at $\sqrt{s} = 13$ TeV, we present the total VBF ALP
production cross sections, ALP decay widths and lifetimes, and relevant
kinematic distributions as a function of $m_{a}$ and $\Lambda$. We consider the
$a\to\gamma\gamma$ decay mode to show that the requirement of an energetic
diphoton pair combined with two forward jets with large dijet mass and
pseudorapidity separation can significantly reduce the Standard Model
backgrounds, leading to a $5\sigma$ discovery reach for $10 \text{ MeV}
\lesssim m_{a} \lesssim 1$ TeV with $\Lambda \lesssim 2$ TeV, assuming an
integrated luminosity of 3000 fb$^{-1}$. In particular, this extends the LHC
sensitivity to a previously unstudied region of the ALP parameter space.
|
[
{
"created": "Tue, 26 Jan 2021 22:28:59 GMT",
"version": "v1"
}
] |
2021-05-12
|
[
[
"Flórez",
"Andrés",
""
],
[
"Gurrola",
"Alfredo",
""
],
[
"Johns",
"Will",
""
],
[
"Sheldon",
"Paul",
""
],
[
"Sheridan",
"Elijah",
""
],
[
"Sinha",
"Kuver",
""
],
[
"Soubasis",
"Brandon",
""
]
] |
We perform a feasibility study to search for axion-like particles (ALPs) using vector boson fusion (VBF) processes at the LHC. We work in an effective field theory framework with cutoff scale $\Lambda$ and ALP mass $m_{a}$, and assume that ALPs couple to photons with strength $\propto 1/\Lambda$. Assuming proton-proton collisions at $\sqrt{s} = 13$ TeV, we present the total VBF ALP production cross sections, ALP decay widths and lifetimes, and relevant kinematic distributions as a function of $m_{a}$ and $\Lambda$. We consider the $a\to\gamma\gamma$ decay mode to show that the requirement of an energetic diphoton pair combined with two forward jets with large dijet mass and pseudorapidity separation can significantly reduce the Standard Model backgrounds, leading to a $5\sigma$ discovery reach for $10 \text{ MeV} \lesssim m_{a} \lesssim 1$ TeV with $\Lambda \lesssim 2$ TeV, assuming an integrated luminosity of 3000 fb$^{-1}$. In particular, this extends the LHC sensitivity to a previously unstudied region of the ALP parameter space.
|
hep-ph/0605277
|
Alejandro Gutierrez-Rodriguez
|
A. Gutierrez-Rodriguez, M. A. Hernandez-Ruiz, B. Jayme-Valdes and M.
A. Perez
|
Bounding the magnetic and electric dipole moments of tau nu from the
process e+e- --> nu bar nu gamma in E6 Superstring Models
|
17 pages, 2 figure
|
Phys.Rev.D74:053002,2006
|
10.1103/PhysRevD.74.053002
| null |
hep-ph
| null |
We obtain bounds on the anomalous magnetic and electric dipole moments of the
tau-neutrino through the reaction $e^{+}e^{-}\to \nu \bar \nu \gamma$ at the
$Z_1$-pole in the framework of a Left-Right symmetric model and a class of
$E_6$ inspired models with an additional neutral vector boson $Z_\theta$. We
use the data collected by the L3 Collaboration at LEP. For the parameters of
the $E_6$ model we consider the mixing angle $\theta_{E_6}=37.8^o$ and
$M_{Z_\theta}=7M_{Z_1}$. We find that our bounds are of the same order of
magnitude as those obtained in other extensions of the Standard Model.
|
[
{
"created": "Thu, 25 May 2006 16:57:40 GMT",
"version": "v1"
},
{
"created": "Sun, 27 Aug 2006 15:10:43 GMT",
"version": "v2"
},
{
"created": "Tue, 29 Aug 2006 21:30:34 GMT",
"version": "v3"
}
] |
2011-03-23
|
[
[
"Gutierrez-Rodriguez",
"A.",
""
],
[
"Hernandez-Ruiz",
"M. A.",
""
],
[
"Jayme-Valdes",
"B.",
""
],
[
"Perez",
"M. A.",
""
]
] |
We obtain bounds on the anomalous magnetic and electric dipole moments of the tau-neutrino through the reaction $e^{+}e^{-}\to \nu \bar \nu \gamma$ at the $Z_1$-pole in the framework of a Left-Right symmetric model and a class of $E_6$ inspired models with an additional neutral vector boson $Z_\theta$. We use the data collected by the L3 Collaboration at LEP. For the parameters of the $E_6$ model we consider the mixing angle $\theta_{E_6}=37.8^o$ and $M_{Z_\theta}=7M_{Z_1}$. We find that our bounds are of the same order of magnitude as those obtained in other extensions of the Standard Model.
|
2407.07828
|
Victor Eugen Ambru\c{s}
|
Pracheta Singha, Victor E. Ambrus, Maxim N. Chernodub
|
Inhibition of splitting of the chiral and deconfinement transition due
to rotation in QCD: the phase diagram of linear sigma model coupled to
Polyakov loop
|
16 pages, 8 figures
| null | null | null |
hep-ph hep-lat hep-th nucl-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We discuss the effect of rigid rotation on critical temperatures of
deconfinement and chiral transitions in the linear sigma model coupled to
quarks and the Polyakov loop. We point out the essential role of the causality
condition, which requires that any point of the system should rotate slower
than the velocity of light. We show that imposing this physical requirement
leads to inhibition of the splitting between the chiral and confining
transitions, which becomes negligibly small ($\Delta T \sim 1$~MeV or less) for
experimentally relevant, slow angular velocities $\Omega \sim 10$~MeV of a
$(5-10)$~fm-sized systems. Moreover, the boundedness of the system has a much
bigger effect on temperature splitting than the rotation itself: the splitting
reaches 10~MeV in a small, one-fermi-sized non-rotating system. The temperature
splitting may, however, become enhanced in an academic limit of
ultra-relativistic regimes when the boundary of the system rotates at
near-to-light velocities.
|
[
{
"created": "Wed, 10 Jul 2024 16:51:22 GMT",
"version": "v1"
}
] |
2024-07-11
|
[
[
"Singha",
"Pracheta",
""
],
[
"Ambrus",
"Victor E.",
""
],
[
"Chernodub",
"Maxim N.",
""
]
] |
We discuss the effect of rigid rotation on critical temperatures of deconfinement and chiral transitions in the linear sigma model coupled to quarks and the Polyakov loop. We point out the essential role of the causality condition, which requires that any point of the system should rotate slower than the velocity of light. We show that imposing this physical requirement leads to inhibition of the splitting between the chiral and confining transitions, which becomes negligibly small ($\Delta T \sim 1$~MeV or less) for experimentally relevant, slow angular velocities $\Omega \sim 10$~MeV of a $(5-10)$~fm-sized systems. Moreover, the boundedness of the system has a much bigger effect on temperature splitting than the rotation itself: the splitting reaches 10~MeV in a small, one-fermi-sized non-rotating system. The temperature splitting may, however, become enhanced in an academic limit of ultra-relativistic regimes when the boundary of the system rotates at near-to-light velocities.
|
hep-ph/9410414
|
Mike Seymour
|
Michael H. Seymour (Lund University, Sweden)
|
Matrix-Element Corrections to Parton Shower Algorithms
|
11 pages, LU TP 94-17
|
Comp.Phys.Commun.90:95-101,1995
|
10.1016/0010-4655(95)00064-M
| null |
hep-ph
| null |
We discuss two ways in which parton shower algorithms can be supplemented by
matrix-element corrections to ensure the correct hard limit: by using
complementary phase-space regions, or by modifying the shower itself. In the
former case, existing algorithms are self-consistent only if the total
correction is small. In the latter case, existing algorithms are never
self-consistent, a problem that is particularly severe for angular-ordered
parton shower algorithms. We show how to construct self-consistent algorithms
in both cases. The postscript file for this paper can also be obtained by
anonymous ftp from thep.lu.se in the file pub/Preprints/lu_tp_94_17.ps
|
[
{
"created": "Mon, 31 Oct 1994 17:07:20 GMT",
"version": "v1"
}
] |
2010-04-06
|
[
[
"Seymour",
"Michael H.",
"",
"Lund University, Sweden"
]
] |
We discuss two ways in which parton shower algorithms can be supplemented by matrix-element corrections to ensure the correct hard limit: by using complementary phase-space regions, or by modifying the shower itself. In the former case, existing algorithms are self-consistent only if the total correction is small. In the latter case, existing algorithms are never self-consistent, a problem that is particularly severe for angular-ordered parton shower algorithms. We show how to construct self-consistent algorithms in both cases. The postscript file for this paper can also be obtained by anonymous ftp from thep.lu.se in the file pub/Preprints/lu_tp_94_17.ps
|
hep-ph/0104178
|
Nigel Glover
|
E.W.N. Glover and M.E. Tejeda-Yeomans
|
One-loop QCD corrections to gluon-gluon scattering at NNLO
|
17 pages, JHEP class
|
JHEP 0105:010,2001
|
10.1088/1126-6708/2001/05/010
|
DCTP/01/30, IPPP/01/15
|
hep-ph
| null |
We present the O(alphas^4) virtual QCD corrections to gluon-gluon scattering
due to the self-interference of the one-loop amplitude. We give analytic
expressions renormalised in the MSbar scheme and work in conventional
dimensional regularisation. We write the structure of the infrared divergences
from direct Feynman diagram evaluation in terms of the Catani formalism for
infrared divergences. Formulae for the finite remainder are given in terms of
logarithms that are real in the physical region. These results, together with
those previously obtained for quark-quark and quark-gluon scattering complete
the one-loop matrix elements for 2 to 2 processes needed for the
next-to-next-to-leading order contribution to inclusive jet production at
hadron colliders.
|
[
{
"created": "Wed, 18 Apr 2001 14:40:32 GMT",
"version": "v1"
}
] |
2010-02-03
|
[
[
"Glover",
"E. W. N.",
""
],
[
"Tejeda-Yeomans",
"M. E.",
""
]
] |
We present the O(alphas^4) virtual QCD corrections to gluon-gluon scattering due to the self-interference of the one-loop amplitude. We give analytic expressions renormalised in the MSbar scheme and work in conventional dimensional regularisation. We write the structure of the infrared divergences from direct Feynman diagram evaluation in terms of the Catani formalism for infrared divergences. Formulae for the finite remainder are given in terms of logarithms that are real in the physical region. These results, together with those previously obtained for quark-quark and quark-gluon scattering complete the one-loop matrix elements for 2 to 2 processes needed for the next-to-next-to-leading order contribution to inclusive jet production at hadron colliders.
|
hep-ph/0107272
|
Bartjan van Tent
|
S. Groot Nibbelink, B. J. W. van Tent
|
Scalar perturbations during multiple-field slow-roll inflation
|
32 pages, 4 figures. v2: Treatment of transition region improved and
section on isocurvature perturbations added. Other minor changes and
references added. v3: Small textual changes, final version
|
Class.Quant.Grav.19:613-640,2002
|
10.1088/0264-9381/19/4/302
|
SPIN-2001/19, ITP-UU-01/27
|
hep-ph astro-ph
| null |
We calculate the scalar gravitational and matter perturbations in the context
of slow-roll inflation with multiple scalar fields, that take values on a
(curved) manifold, to first order in slow roll. For that purpose a basis for
these perturbations determined by the background dynamics is introduced and
multiple-field slow-roll functions are defined. To obtain analytic solutions to
first order, the scalar perturbation modes have to be treated in three
different regimes. Matching is performed by analytically identifying leading
order asymptotic expansions in different regions. Possible sources for
multiple-field effects in the gravitational potential are the particular
solution caused by the coupling to the field perturbation perpendicular to the
field velocity, and the rotation of the basis. The former can contribute even
to leading order if the corresponding multiple-field slow-roll function is
sizable during the last 60 e-folds. Making some simplifying assumptions, the
evolution of adiabatic and isocurvature perturbations after inflation is
discussed. The analytical results are illustrated and checked numerically with
the example of a quadratic potential.
|
[
{
"created": "Thu, 26 Jul 2001 12:39:58 GMT",
"version": "v1"
},
{
"created": "Mon, 19 Nov 2001 16:56:10 GMT",
"version": "v2"
},
{
"created": "Fri, 22 Mar 2002 17:59:54 GMT",
"version": "v3"
}
] |
2011-10-11
|
[
[
"Nibbelink",
"S. Groot",
""
],
[
"van Tent",
"B. J. W.",
""
]
] |
We calculate the scalar gravitational and matter perturbations in the context of slow-roll inflation with multiple scalar fields, that take values on a (curved) manifold, to first order in slow roll. For that purpose a basis for these perturbations determined by the background dynamics is introduced and multiple-field slow-roll functions are defined. To obtain analytic solutions to first order, the scalar perturbation modes have to be treated in three different regimes. Matching is performed by analytically identifying leading order asymptotic expansions in different regions. Possible sources for multiple-field effects in the gravitational potential are the particular solution caused by the coupling to the field perturbation perpendicular to the field velocity, and the rotation of the basis. The former can contribute even to leading order if the corresponding multiple-field slow-roll function is sizable during the last 60 e-folds. Making some simplifying assumptions, the evolution of adiabatic and isocurvature perturbations after inflation is discussed. The analytical results are illustrated and checked numerically with the example of a quadratic potential.
|
0708.4123
|
Stefan Dittmaier
|
A. Bredenstein, A. Denner, S. Dittmaier and M. M. Weber
|
Precision calculations for H -> WW/ZZ -> 4fermions with PROPHECY4f
|
5 pages, latex, 4 eps figures, to appear in the proceedings of the
International Linear Collider Workshop LCWS07, Hamburg, 2007
| null | null |
MPP-2007-118
|
hep-ph
| null |
PROPHECY4f is a Monte Carlo event generator for precise simulations of the
Higgs-boson decay H -> WW/ZZ -> 4fermions, supporting leptonic, semileptonic,
and four-quark final states. Both electroweak and QCD corrections are included.
Treating the intermediate gauge bosons as resonances, the calculation covers
the full Higgs-boson mass range above, near, and below the gauge-boson pair
thresholds. In this article we pay particular attention to the recently
implemented option of PROPHECY4f to generate unweighted events.
|
[
{
"created": "Thu, 30 Aug 2007 10:41:33 GMT",
"version": "v1"
}
] |
2007-08-31
|
[
[
"Bredenstein",
"A.",
""
],
[
"Denner",
"A.",
""
],
[
"Dittmaier",
"S.",
""
],
[
"Weber",
"M. M.",
""
]
] |
PROPHECY4f is a Monte Carlo event generator for precise simulations of the Higgs-boson decay H -> WW/ZZ -> 4fermions, supporting leptonic, semileptonic, and four-quark final states. Both electroweak and QCD corrections are included. Treating the intermediate gauge bosons as resonances, the calculation covers the full Higgs-boson mass range above, near, and below the gauge-boson pair thresholds. In this article we pay particular attention to the recently implemented option of PROPHECY4f to generate unweighted events.
|
1501.03494
|
Kuver Sinha
|
Ben Allanach, Alexandre Alves, Farinaldo S. Queiroz, Kuver Sinha,
Alessandro Strumia
|
Interpreting the CMS $\ell^+\ell^- jj E\!\!\!\!/_{\rm T}$ Excess with a
Leptoquark Model
|
6 pages, 2 figures. Version accepted in PRD
|
Phys. Rev. D 92, 055023 (2015)
|
10.1103/PhysRevD.92.055023
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Motivated by excesses in $ee jj$ and $e\nu jj$ channels observed by the CMS
collaboration, in 8 TeV LHC data, a model of lepto-quarks with mass around 500
GeV was proposed in the literature. In order to reproduce the claimed event
rate, lepto-quarks were assumed to have a significant partial branching ratio
into an extra sector, taken to be Dark Matter, other than the canonical $ej$.
We here show that the decay channel of lepto-quark into Dark Matter can fit
another excess claimed by CMS, in $\ell^+\ell^- jj E\!\!\!\!/_{\rm T}$: the
event rate, the distribution in di-lepton invariant mass and the rapidity range
are compatible with the data. We provide predictions for the forthcoming Run II
of the 14 TeV LHC and discuss aspects of dark matter detection.
|
[
{
"created": "Wed, 14 Jan 2015 21:00:11 GMT",
"version": "v1"
},
{
"created": "Tue, 15 Sep 2015 22:29:00 GMT",
"version": "v2"
}
] |
2015-09-23
|
[
[
"Allanach",
"Ben",
""
],
[
"Alves",
"Alexandre",
""
],
[
"Queiroz",
"Farinaldo S.",
""
],
[
"Sinha",
"Kuver",
""
],
[
"Strumia",
"Alessandro",
""
]
] |
Motivated by excesses in $ee jj$ and $e\nu jj$ channels observed by the CMS collaboration, in 8 TeV LHC data, a model of lepto-quarks with mass around 500 GeV was proposed in the literature. In order to reproduce the claimed event rate, lepto-quarks were assumed to have a significant partial branching ratio into an extra sector, taken to be Dark Matter, other than the canonical $ej$. We here show that the decay channel of lepto-quark into Dark Matter can fit another excess claimed by CMS, in $\ell^+\ell^- jj E\!\!\!\!/_{\rm T}$: the event rate, the distribution in di-lepton invariant mass and the rapidity range are compatible with the data. We provide predictions for the forthcoming Run II of the 14 TeV LHC and discuss aspects of dark matter detection.
|
hep-ph/9809591
|
Ilya Narodetskii
|
S.Kotkovsky, I.M.Narodetskii, K.A.Ter-Martirosyan (ITEP, Moscow) and
S.Simula (INFN, Sezione Roma III)
|
The general relation between the weak inclusive decays of bound and free
heavy quarks
|
espcrc2.sty (included), 3 pages, Presented at the Third International
Conference on Hyperons, Charm and Beauty Hadrons, Genova, June 30 --July 3,
1998, to appear in proceedings
|
Nucl.Phys.Proc.Suppl.75B:100-102,1999
|
10.1016/S0920-5632(99)00334-5
| null |
hep-ph
| null |
We derive a new parton formula for the inclusive B decays and briefly discuss
its applications to semileptonic and weak radiative decays of the B-meson.
|
[
{
"created": "Wed, 30 Sep 1998 14:33:17 GMT",
"version": "v1"
}
] |
2011-01-25
|
[
[
"Kotkovsky",
"S.",
"",
"ITEP, Moscow"
],
[
"Narodetskii",
"I. M.",
"",
"ITEP, Moscow"
],
[
"Ter-Martirosyan",
"K. A.",
"",
"ITEP, Moscow"
],
[
"Simula",
"S.",
"",
"INFN, Sezione Roma III"
]
] |
We derive a new parton formula for the inclusive B decays and briefly discuss its applications to semileptonic and weak radiative decays of the B-meson.
|
1504.06931
|
Hiroyuki Ishida
|
Hiroyuki Ishida
|
Higgs Inflation and Scalar Dark Matter with Right-handed Neutrinos
|
4 pages, 3 figures, proceedings of the HPNP2015 conference
| null | null |
SU-HET-04-2015
|
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We investigate the possibility of Higgs inflation with an extended standard
model by right-handed neutrinos and scalar dark matter. We find that the masses
of the dark matter and one of the right-handed neutrinos should stand around
TeV and $10^{-14}$ GeV scale respectively even if the magnitude of
tensor-to-scalar ratio indicates sufficiently small value.
|
[
{
"created": "Mon, 27 Apr 2015 05:22:09 GMT",
"version": "v1"
}
] |
2015-04-29
|
[
[
"Ishida",
"Hiroyuki",
""
]
] |
We investigate the possibility of Higgs inflation with an extended standard model by right-handed neutrinos and scalar dark matter. We find that the masses of the dark matter and one of the right-handed neutrinos should stand around TeV and $10^{-14}$ GeV scale respectively even if the magnitude of tensor-to-scalar ratio indicates sufficiently small value.
|
2309.11683
|
Ruben Gargiulo
|
Ruben Gargiulo, Elisa Di Meco, Daniele Paesani, Stefano Palmisano,
Eleonora Diociaiuti, Ivano Sarra
|
True muonium resonant production at $e^+e^-$ colliders with standard
crossing angle
| null | null | null | null |
hep-ph hep-ex
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
True muonium ($\mu^+\mu^-$) is the heaviest and smallest bound state not
involving quantum chromodynamics, after true tauonium ($\tau^+\tau^-$) and
mu-tauonium ($\mu^\pm\tau^\mp$). Unlike atoms containing $\tau$ particles, the
muon lifetime is long enough to allow observation of true muonium (TM) decays
and transitions. One of the proposed methods to observe the spin 1 fundamental
state of TM, which has the smallest lifetime among TM spin 1 states, was to
build an $e^+e^-$ collider with a large crossing angle ($\theta \sim 30^\circ$)
in order to provide TM with a large boost and detect its decay vertex in $e^+
e^-$. The following paper will instead show that TM excited states ($n\geq2$)
can be observed in relatively large quantities ($\mathcal{O}$(10)/month) at a
feasible $e^+e^-$ collider with standard crossing angles, after setting their
center-of-mass energy to the TM mass ($\sim2m_{\mu}=211.4$ MeV).
|
[
{
"created": "Wed, 20 Sep 2023 23:27:44 GMT",
"version": "v1"
},
{
"created": "Thu, 28 Sep 2023 17:14:08 GMT",
"version": "v2"
},
{
"created": "Fri, 26 Jan 2024 14:05:23 GMT",
"version": "v3"
}
] |
2024-01-29
|
[
[
"Gargiulo",
"Ruben",
""
],
[
"Di Meco",
"Elisa",
""
],
[
"Paesani",
"Daniele",
""
],
[
"Palmisano",
"Stefano",
""
],
[
"Diociaiuti",
"Eleonora",
""
],
[
"Sarra",
"Ivano",
""
]
] |
True muonium ($\mu^+\mu^-$) is the heaviest and smallest bound state not involving quantum chromodynamics, after true tauonium ($\tau^+\tau^-$) and mu-tauonium ($\mu^\pm\tau^\mp$). Unlike atoms containing $\tau$ particles, the muon lifetime is long enough to allow observation of true muonium (TM) decays and transitions. One of the proposed methods to observe the spin 1 fundamental state of TM, which has the smallest lifetime among TM spin 1 states, was to build an $e^+e^-$ collider with a large crossing angle ($\theta \sim 30^\circ$) in order to provide TM with a large boost and detect its decay vertex in $e^+ e^-$. The following paper will instead show that TM excited states ($n\geq2$) can be observed in relatively large quantities ($\mathcal{O}$(10)/month) at a feasible $e^+e^-$ collider with standard crossing angles, after setting their center-of-mass energy to the TM mass ($\sim2m_{\mu}=211.4$ MeV).
|
hep-ph/0604068
|
S. Weinzierl
|
Stefan Weinzierl
|
The Art of Computing Loop Integrals
|
49 pages, to appear in the proceedings of the workshop
"Renormalization and Universality in Mathematical Physics", held at the
Fields Institute, Toronto, October 2005
| null | null | null |
hep-ph
| null |
A perturbative approach to quantum field theory involves the computation of
loop integrals, as soon as one goes beyond the leading term in the perturbative
expansion. First I review standard techniques for the computation of loop
integrals. In a second part I discuss more advanced algorithms. For these
algorithms algebraic methods play an important role. A special section is
devoted to multiple polylogarithms.
I tried to make these notes self-contained and accessible both to physicists
and mathematicians.
|
[
{
"created": "Fri, 7 Apr 2006 07:45:47 GMT",
"version": "v1"
}
] |
2007-05-23
|
[
[
"Weinzierl",
"Stefan",
""
]
] |
A perturbative approach to quantum field theory involves the computation of loop integrals, as soon as one goes beyond the leading term in the perturbative expansion. First I review standard techniques for the computation of loop integrals. In a second part I discuss more advanced algorithms. For these algorithms algebraic methods play an important role. A special section is devoted to multiple polylogarithms. I tried to make these notes self-contained and accessible both to physicists and mathematicians.
|
1210.6345
|
Mathias Ritzmann
|
M. Ritzmann, D. A. Kosower, P. Skands
|
Antenna Showers with Hadronic Initial States
|
9 pages, 5 figures
| null |
10.1016/j.physletb.2012.12.003
|
CERN-PH-TH/2012-278
|
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We present an antenna shower formalism including contributions from
initial-state partons and corresponding backwards evolution. We give a set of
phase-space maps and antenna functions for massless partons which define a
complete shower formalism suitable for computing observables with hadronic
initial states. We focus on the initial-state components: initial-initial and
initial-final antenna configurations. The formalism includes comprehensive
possibilities for uncertainty estimates. We report on some preliminary results
obtained with an implementation in the Vincia antenna-shower framework.
|
[
{
"created": "Tue, 23 Oct 2012 19:57:56 GMT",
"version": "v1"
}
] |
2015-06-11
|
[
[
"Ritzmann",
"M.",
""
],
[
"Kosower",
"D. A.",
""
],
[
"Skands",
"P.",
""
]
] |
We present an antenna shower formalism including contributions from initial-state partons and corresponding backwards evolution. We give a set of phase-space maps and antenna functions for massless partons which define a complete shower formalism suitable for computing observables with hadronic initial states. We focus on the initial-state components: initial-initial and initial-final antenna configurations. The formalism includes comprehensive possibilities for uncertainty estimates. We report on some preliminary results obtained with an implementation in the Vincia antenna-shower framework.
|
hep-ph/0610280
|
Yadong Yang
|
Qin Chang, Xin-Qiang Li, Ya-Dong Yang
|
Constraints on the anomalous tensor operators from B\to\phi K^{\ast},
\eta K^{\ast}$ and \eta K decays
|
27 pages, 5 tables and 6 figures. Journal version
|
JHEP 0706:038,2007
|
10.1088/1126-6708/2007/06/038
| null |
hep-ph
| null |
We investigate whether the anomalous tensor operators with the Lorentz
structure $\sigma_{\mu\nu} (1+\gamma_{5})\otimes
\sigma^{\mu\nu}(1+\gamma_{5})$, which could provide a simple resolution to the
polarization anomaly observed in $B\to \phi K^{\ast}$ decays, could also
provide a coherent resolution to the large ${\cal B}(B\to \eta K^{\ast})$ and
survive bounds from $B\to\eta K$ decays. Parameter spaces satisfying all these
experimental data are obtained, and found to be dominated by the color-octet
tensor operator contribution. Constraints for the equivalent solution with
$(1+\gamma_{5})\otimes(1+\gamma_{5})$ operators are also derived and found to
be dominated by the color-singlet one. With the constrained parameter spaces,
we finally give predictions for $B_{s}\to \phi \phi$ decay, which could be
tested at the Fermilab Tevatron and the LHC-b experiments.
|
[
{
"created": "Sat, 21 Oct 2006 18:37:09 GMT",
"version": "v1"
},
{
"created": "Mon, 5 Feb 2007 16:23:11 GMT",
"version": "v2"
},
{
"created": "Sat, 14 Apr 2007 07:29:29 GMT",
"version": "v3"
},
{
"created": "Sun, 8 Jul 2007 13:35:27 GMT",
"version": "v4"
}
] |
2010-10-27
|
[
[
"Chang",
"Qin",
""
],
[
"Li",
"Xin-Qiang",
""
],
[
"Yang",
"Ya-Dong",
""
]
] |
We investigate whether the anomalous tensor operators with the Lorentz structure $\sigma_{\mu\nu} (1+\gamma_{5})\otimes \sigma^{\mu\nu}(1+\gamma_{5})$, which could provide a simple resolution to the polarization anomaly observed in $B\to \phi K^{\ast}$ decays, could also provide a coherent resolution to the large ${\cal B}(B\to \eta K^{\ast})$ and survive bounds from $B\to\eta K$ decays. Parameter spaces satisfying all these experimental data are obtained, and found to be dominated by the color-octet tensor operator contribution. Constraints for the equivalent solution with $(1+\gamma_{5})\otimes(1+\gamma_{5})$ operators are also derived and found to be dominated by the color-singlet one. With the constrained parameter spaces, we finally give predictions for $B_{s}\to \phi \phi$ decay, which could be tested at the Fermilab Tevatron and the LHC-b experiments.
|
1808.00470
|
Ye-Ling Zhou
|
Jessica Turner, Ye-Ling Zhou
|
Leptogenesis via Varying Weinberg Operator: the Closed-Time-Path
Approach
|
49 pages, 5 figures, references added, extensive discussions on
energy transfer and the zero width limit included, an appendix on
leptogenesis via oscillating Weinberg operator added, to be published in JHEP
| null | null |
IPPP/18/65, FERMILAB-PUB-18-329-T
|
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
In this work we provide a detailed study of the CP violating phase transition
(CPPT) which is a new mechanism proposed to produce a baryon asymmetry. This
mechanism exploits the Weinberg operator whose coefficient is dynamically
realised from the vacuum expectation values (VEVs) of new scalars. In the
specific case of the first order phase transition, the scalar VEVs vary in the
bubble wall which separates the two phases. This results in a spacetime varying
coefficient for the Weinberg operator. The interference of two Weinberg
operators at different spacetime points generates a CP asymmetry between lepton
and anti-lepton production/annihilation processes, which eventually results in
an asymmetry between baryon and anti-baryon number densities in the early
Universe. We present the calculation of the lepton asymmetry, based on
non-equilibrium quantum field theory methods, in full. We consider the
influence of the bubble wall characteristics and the impact of thermal effects
on the lepton asymmetry and draw a comparison between the CPPT mechanism and
electroweak baryogenesis.
|
[
{
"created": "Wed, 1 Aug 2018 18:00:04 GMT",
"version": "v1"
},
{
"created": "Fri, 13 Dec 2019 12:31:43 GMT",
"version": "v2"
}
] |
2019-12-16
|
[
[
"Turner",
"Jessica",
""
],
[
"Zhou",
"Ye-Ling",
""
]
] |
In this work we provide a detailed study of the CP violating phase transition (CPPT) which is a new mechanism proposed to produce a baryon asymmetry. This mechanism exploits the Weinberg operator whose coefficient is dynamically realised from the vacuum expectation values (VEVs) of new scalars. In the specific case of the first order phase transition, the scalar VEVs vary in the bubble wall which separates the two phases. This results in a spacetime varying coefficient for the Weinberg operator. The interference of two Weinberg operators at different spacetime points generates a CP asymmetry between lepton and anti-lepton production/annihilation processes, which eventually results in an asymmetry between baryon and anti-baryon number densities in the early Universe. We present the calculation of the lepton asymmetry, based on non-equilibrium quantum field theory methods, in full. We consider the influence of the bubble wall characteristics and the impact of thermal effects on the lepton asymmetry and draw a comparison between the CPPT mechanism and electroweak baryogenesis.
|
2006.06685
|
Ramon Winterhalder
|
Marco Bellagente, Anja Butter, Gregor Kasieczka, Tilman Plehn, Armand
Rousselot, Ramon Winterhalder, Lynton Ardizzone, Ullrich K\"othe
|
Invertible Networks or Partons to Detector and Back Again
|
25 pages, 10 figures
|
SciPost Phys. 9, 074 (2020)
|
10.21468/SciPostPhys.9.5.074
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
For simulations where the forward and the inverse directions have a physics
meaning, invertible neural networks are especially useful. A conditional INN
can invert a detector simulation in terms of high-level observables,
specifically for ZW production at the LHC. It allows for a per-event
statistical interpretation. Next, we allow for a variable number of QCD jets.
We unfold detector effects and QCD radiation to a pre-defined hard process,
again with a per-event probabilistic interpretation over parton-level phase
space.
|
[
{
"created": "Thu, 11 Jun 2020 18:00:00 GMT",
"version": "v1"
},
{
"created": "Mon, 6 Jul 2020 08:16:50 GMT",
"version": "v2"
},
{
"created": "Thu, 1 Oct 2020 13:16:41 GMT",
"version": "v3"
}
] |
2020-11-18
|
[
[
"Bellagente",
"Marco",
""
],
[
"Butter",
"Anja",
""
],
[
"Kasieczka",
"Gregor",
""
],
[
"Plehn",
"Tilman",
""
],
[
"Rousselot",
"Armand",
""
],
[
"Winterhalder",
"Ramon",
""
],
[
"Ardizzone",
"Lynton",
""
],
[
"Köthe",
"Ullrich",
""
]
] |
For simulations where the forward and the inverse directions have a physics meaning, invertible neural networks are especially useful. A conditional INN can invert a detector simulation in terms of high-level observables, specifically for ZW production at the LHC. It allows for a per-event statistical interpretation. Next, we allow for a variable number of QCD jets. We unfold detector effects and QCD radiation to a pre-defined hard process, again with a per-event probabilistic interpretation over parton-level phase space.
|
hep-ph/0410192
|
Amarjit Soni
|
Thomas E. Browder and Amarjit Soni
|
Search for New Physics at a Super-B Factory
|
Invited plenary talk at the Workshop on High Energy Physics
Phenomenology (WHEPP8), Indian Inst. of Technology, Mumbai, India Jan.
5-16,2004. Corrected typos; minor changes and added references
|
Pramana 63:1171-1194,2004
|
10.1007/BF02704889
|
BNL-HET-04/20
|
hep-ph
| null |
The importance of a Super-B Factory in the search for New Physics, in
particular, due to CP-od phase(s) from physics beyond the Standard Model is
surveyed. The first point to emphasize is that we know now how to directly
measure all three angles of the unitarity triangle very cleanly, {\it i.e.
without theoretical assumptions} with {\it irreducible theory error $ \lsim
1%$}; however this requires much more luminosity than is currently available at
B-factories. Direct searches via penguin-dominated hadronic modes as well as
radiative, pair-leptonic and semi-leptonic decays are also discussed. {\bf Null
tests of the SM} are stressed as these will play a crucial role especially if
the effects of BSM phase(s) on B-physics are small.
|
[
{
"created": "Wed, 13 Oct 2004 14:04:22 GMT",
"version": "v1"
},
{
"created": "Mon, 29 Nov 2004 23:48:24 GMT",
"version": "v2"
}
] |
2010-11-23
|
[
[
"Browder",
"Thomas E.",
""
],
[
"Soni",
"Amarjit",
""
]
] |
The importance of a Super-B Factory in the search for New Physics, in particular, due to CP-od phase(s) from physics beyond the Standard Model is surveyed. The first point to emphasize is that we know now how to directly measure all three angles of the unitarity triangle very cleanly, {\it i.e. without theoretical assumptions} with {\it irreducible theory error $ \lsim 1%$}; however this requires much more luminosity than is currently available at B-factories. Direct searches via penguin-dominated hadronic modes as well as radiative, pair-leptonic and semi-leptonic decays are also discussed. {\bf Null tests of the SM} are stressed as these will play a crucial role especially if the effects of BSM phase(s) on B-physics are small.
|
2009.12555
|
Hua-Sheng Shao
|
Hua-Sheng Shao
|
Associated production in pp and heavy ion collisions
|
4 pages, 1 figure, accepted contribution to proceedings of the 8th
Annual Conference on Large Hadron Collider Physics (LHCP2020), 25-30 May,
2020, online
|
PoS(LHCP2020)172
| null | null |
hep-ph hep-ex nucl-ex nucl-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Associated particle production processes in pp and heavy ion collisions at
the LHC are in particular interesting in the sense that they provide unique
tools to study double parton scattering (DPS) mechanism. In this talk, I will
first review the recent theoretical, phenomenological and experimental
developments of DPS in pp collisions. Then, I will focus on the DPS studies in
heavy ion collisions, and stress their roles in understanding the cold nuclear
matter effects, such as the (poorly known) impact-parameter dependent nuclear
parton densities.
|
[
{
"created": "Sat, 26 Sep 2020 10:06:26 GMT",
"version": "v1"
}
] |
2020-09-29
|
[
[
"Shao",
"Hua-Sheng",
""
]
] |
Associated particle production processes in pp and heavy ion collisions at the LHC are in particular interesting in the sense that they provide unique tools to study double parton scattering (DPS) mechanism. In this talk, I will first review the recent theoretical, phenomenological and experimental developments of DPS in pp collisions. Then, I will focus on the DPS studies in heavy ion collisions, and stress their roles in understanding the cold nuclear matter effects, such as the (poorly known) impact-parameter dependent nuclear parton densities.
|
hep-ph/9802350
|
Kari Eskola
|
K.J. Eskola, V.J. Kolhinen and P.V. Ruuskanen
|
Scale evolution of nuclear parton distributions
|
26 pages, including 10 eps-figures
|
Nucl.Phys.B535:351-371,1998
|
10.1016/S0550-3213(98)00589-6
|
CERN-TH/97-345, JYFL-2/98
|
hep-ph nucl-th
| null |
Using the NMC and E665 nuclear structure function ratios $F_2^A/F_2^D$ and
$F_2^A/F_2^{C}$ from deep inelastic lepton-nucleus collisions, and the E772
Drell--Yan dilepton cross sections from proton-nucleus collisions, and
incorporating baryon number and momentum sum rules, we determine nuclear parton
distributions at an initial scale $Q_0^2$. With these distributions, we study
QCD scale evolution of nuclear parton densities. The emphasis is on small
values of $x$, especially on scale dependence of nuclear shadowing. As the main
result, we show that a consistent picture can be obtained within the leading
twist DGLAP evolution, and in particular, that the calculated $Q^2$ dependence
of $F_2^{Sn}/F_2^{C}$ agrees very well with the recent NMC data.
|
[
{
"created": "Wed, 18 Feb 1998 17:01:44 GMT",
"version": "v1"
}
] |
2014-11-17
|
[
[
"Eskola",
"K. J.",
""
],
[
"Kolhinen",
"V. J.",
""
],
[
"Ruuskanen",
"P. V.",
""
]
] |
Using the NMC and E665 nuclear structure function ratios $F_2^A/F_2^D$ and $F_2^A/F_2^{C}$ from deep inelastic lepton-nucleus collisions, and the E772 Drell--Yan dilepton cross sections from proton-nucleus collisions, and incorporating baryon number and momentum sum rules, we determine nuclear parton distributions at an initial scale $Q_0^2$. With these distributions, we study QCD scale evolution of nuclear parton densities. The emphasis is on small values of $x$, especially on scale dependence of nuclear shadowing. As the main result, we show that a consistent picture can be obtained within the leading twist DGLAP evolution, and in particular, that the calculated $Q^2$ dependence of $F_2^{Sn}/F_2^{C}$ agrees very well with the recent NMC data.
|
hep-ph/0301028
|
Dr. Lars Gerland
|
L. Frankfurt, L. Gerland, M. Strikman, M. Zhalov
|
Cross Section Oscillations in the Coherent Charmonium Photoproduction
off Nuclei at Moderate Energies
|
20 pages, 7 figures (color)
|
Phys. Rev. C68, 044602, 2003 (combined with hep-ph/0301077)
| null | null |
hep-ph nucl-th
| null |
We calculate the coherent charmonium photoproduction at intermediate energies
accounting for the physics of the charmonium bound states and the dependence of
the cross section on the region occupied by color using a correspondingly
adjusted generalized vector dominance model (GVDM). In the photon energy domain
where the coherence lengths are comparable to the average internucleon
distances in nuclei and the nuclear radii we found that significant
oscillations of the total and forward photoproduction cross sections governed
by the longitudinal nuclear form factor are strongly modified by the charmonium
rescatterings accounting for the nondiagonal transitions related to the color
screening phenomenon. We discuss how these oscillations can influence the
determination of the genuine charmonium-nucleon cross sections in the
forthcoming SLAC E160 experiment on low energy J/psi and psi' photoproduction
off nuclei.
|
[
{
"created": "Mon, 6 Jan 2003 13:54:55 GMT",
"version": "v1"
}
] |
2007-05-23
|
[
[
"Frankfurt",
"L.",
""
],
[
"Gerland",
"L.",
""
],
[
"Strikman",
"M.",
""
],
[
"Zhalov",
"M.",
""
]
] |
We calculate the coherent charmonium photoproduction at intermediate energies accounting for the physics of the charmonium bound states and the dependence of the cross section on the region occupied by color using a correspondingly adjusted generalized vector dominance model (GVDM). In the photon energy domain where the coherence lengths are comparable to the average internucleon distances in nuclei and the nuclear radii we found that significant oscillations of the total and forward photoproduction cross sections governed by the longitudinal nuclear form factor are strongly modified by the charmonium rescatterings accounting for the nondiagonal transitions related to the color screening phenomenon. We discuss how these oscillations can influence the determination of the genuine charmonium-nucleon cross sections in the forthcoming SLAC E160 experiment on low energy J/psi and psi' photoproduction off nuclei.
|
0907.5139
|
Carsten M\"uller
|
Sarah J. M\"uller and Carsten M\"uller
|
Few-Photon Electron-Positron Pair Creation by Relativistic Muon Impact
on Intense Laser Beams
|
14 pages, 10 figures
|
Phys.Rev.D80:053014,2009
|
10.1103/PhysRevD.80.053014
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Electron-positron pair production in combined laser and Coulomb fields is
studied. To this end, the Feynman diagram for multiphoton pair creation by muon
impact on a circularly polarized high-frequency laser beam is evaluated within
the framework of laser-dressed quantum electrodynamics employing relativistic
Volkov states. In the limit of low laser intensity, the result is shown to
coincide with the known expression for multiphoton pair creation by a proton
which is treated as an external Coulomb field. A scaling of the total pair
creation rate is analyzed. The recoil distribution is calculated numerically
and its dependence on the projectile mass is discussed. Energy spectra of the
created particles and angular spectra of the scattered muon are presented.
|
[
{
"created": "Wed, 29 Jul 2009 14:10:11 GMT",
"version": "v1"
}
] |
2009-11-06
|
[
[
"Müller",
"Sarah J.",
""
],
[
"Müller",
"Carsten",
""
]
] |
Electron-positron pair production in combined laser and Coulomb fields is studied. To this end, the Feynman diagram for multiphoton pair creation by muon impact on a circularly polarized high-frequency laser beam is evaluated within the framework of laser-dressed quantum electrodynamics employing relativistic Volkov states. In the limit of low laser intensity, the result is shown to coincide with the known expression for multiphoton pair creation by a proton which is treated as an external Coulomb field. A scaling of the total pair creation rate is analyzed. The recoil distribution is calculated numerically and its dependence on the projectile mass is discussed. Energy spectra of the created particles and angular spectra of the scattered muon are presented.
|
2209.13225
|
Felipe J. Llanes-Estrada
|
Guillermo Benito-Calvi\~no, Javier Garc\'ia-Olivares and Felipe J.
Llanes-Estrada (Univ. Complutense Madrid)
|
Information entropy and fragmentation functions
|
11 pages, 21 plots
|
Nuclear Physics A 1036, 122670 (2023)
|
10.1016/j.nuclphysa.2023.122670
|
IPARCOS-UCM-23-072
|
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Several groups have recently investigated the flow of information in
high-energy collisions, from the entanglement entropy of the proton yielding
classical Shannon entropy of its parton distribution functions (pdfs), through
jet splitting generating entropy, to the entropy distribution in hadron decays.
Lacking in the literature is a discussion of the information entropy of
fragmentation functions (FFs) in the instances where they can be considered as
probability distributions, and we here provide it. We find that this entropy is
a single, convenient number to characterize future progress in the extraction
of fragmentation functions. We also deploy the related Kullback-Leibler
divergence between two distributions to assess existing relations among FFs and
parton distribution functions (pdfs) such as that of Barone, Drago and Ma. From
a couple of current parametrizations of FFs, we do not find supporting
empirical evidence for the relation, although it is possible that FFs and pdfs
have similar power-laws near the $x=1$ endpoint.
|
[
{
"created": "Tue, 27 Sep 2022 07:54:03 GMT",
"version": "v1"
}
] |
2023-08-11
|
[
[
"Benito-Calviño",
"Guillermo",
"",
"Univ. Complutense Madrid"
],
[
"García-Olivares",
"Javier",
"",
"Univ. Complutense Madrid"
],
[
"Llanes-Estrada",
"Felipe J.",
"",
"Univ. Complutense Madrid"
]
] |
Several groups have recently investigated the flow of information in high-energy collisions, from the entanglement entropy of the proton yielding classical Shannon entropy of its parton distribution functions (pdfs), through jet splitting generating entropy, to the entropy distribution in hadron decays. Lacking in the literature is a discussion of the information entropy of fragmentation functions (FFs) in the instances where they can be considered as probability distributions, and we here provide it. We find that this entropy is a single, convenient number to characterize future progress in the extraction of fragmentation functions. We also deploy the related Kullback-Leibler divergence between two distributions to assess existing relations among FFs and parton distribution functions (pdfs) such as that of Barone, Drago and Ma. From a couple of current parametrizations of FFs, we do not find supporting empirical evidence for the relation, although it is possible that FFs and pdfs have similar power-laws near the $x=1$ endpoint.
|
2002.12265
|
Kazuki Enomoto
|
Mayumi Aoki, Kazuki Enomoto, Shinya Kanemura
|
Probing charged lepton number violation via $\ell^\pm \ell^{\prime \pm}
W^\mp W^\mp$
|
35 pages, 15 figures, 4 tables; Version published in Phys. Rev. D
|
Phys. Rev. D 101, 115019 (2020)
|
10.1103/PhysRevD.101.115019
|
OU-HET-1042, KANAZAWA-20-02
|
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We study impacts of dimension-five lepton-number violating operators
associated with two same-sign weak bosons, $\ell^\pm \ell^{\prime \pm} W^\mp
W^\mp$, on current and future experiments for neutrino oscillation,
lepton-number violating rare processes and high-energy collider experiments.
These operators can contain important information on the origin of tiny
neutrino masses, which is independent of that from the so-called Weinberg
operator. We examine constraints on the coefficients of the operators by the
neutrino oscillation data. Upper bounds on the coefficients are also
investigated by using the data for processes of lepton number violation such as
neutrinoless double beta decays and $\mu^-$-$e^+$ conversion. These operators
can also be directly tested by searching for lepton-number violating dilepton
production via the same-sign W boson fusion process at high-energy hadron
colliders like the Large Hadron Collider. We find that these operators can be
considerably probed by these current and future experiments.
|
[
{
"created": "Thu, 27 Feb 2020 17:11:12 GMT",
"version": "v1"
},
{
"created": "Thu, 25 Jun 2020 06:35:39 GMT",
"version": "v2"
}
] |
2020-07-01
|
[
[
"Aoki",
"Mayumi",
""
],
[
"Enomoto",
"Kazuki",
""
],
[
"Kanemura",
"Shinya",
""
]
] |
We study impacts of dimension-five lepton-number violating operators associated with two same-sign weak bosons, $\ell^\pm \ell^{\prime \pm} W^\mp W^\mp$, on current and future experiments for neutrino oscillation, lepton-number violating rare processes and high-energy collider experiments. These operators can contain important information on the origin of tiny neutrino masses, which is independent of that from the so-called Weinberg operator. We examine constraints on the coefficients of the operators by the neutrino oscillation data. Upper bounds on the coefficients are also investigated by using the data for processes of lepton number violation such as neutrinoless double beta decays and $\mu^-$-$e^+$ conversion. These operators can also be directly tested by searching for lepton-number violating dilepton production via the same-sign W boson fusion process at high-energy hadron colliders like the Large Hadron Collider. We find that these operators can be considerably probed by these current and future experiments.
|
0807.1822
|
Alexander Titov
|
A.I. Titov and B. Kampfer
|
Exclusive charm production in pbar p collisions at s^1/2 <15 GeV
|
26 pages, 18 figures
|
Phys.Rev.C78:025201,2008
|
10.1103/PhysRevC.78.025201
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We discuss the open charm production in peripheral reactions
$\bar pp\to \bar Y_cY_c$ and $\bar pp\to M_c\bar M_c$, where
$Y_c$ and $M_c$ stand for $\Lambda_c^+,\Sigma_c^+$ and
$D,D^*$, respectively, at $\sqrt{s}\lesssim 15$ GeV, which corresponds to the
energy range of FAIR. Our consideration is based on the topological
decomposition of the planar quark and diquark diagrams which allows to estimate
consistently meson and baryon exchange trajectories and energy scale parameters
as well. The spin dependence is determined by the effective interaction of
lowest exchanged resonance. Unknown parameters are fixed by an independent
analysis of open strangeness production in $\bar pp\to \bar YY$ and $\bar pp\to
\bar KK$ reactions and of SU(4) symmetry. We present the corresponding cross
sections and longitudinal double-spin asymmetries for exclusive binary
reactions with open charm mesons and baryons in the final state. The
polarization observables have a non-trivial $t$ and $s$ dependence which is
sensitive to details of the open charm production mechanism.
|
[
{
"created": "Fri, 11 Jul 2008 11:12:38 GMT",
"version": "v1"
}
] |
2008-11-26
|
[
[
"Titov",
"A. I.",
""
],
[
"Kampfer",
"B.",
""
]
] |
We discuss the open charm production in peripheral reactions $\bar pp\to \bar Y_cY_c$ and $\bar pp\to M_c\bar M_c$, where $Y_c$ and $M_c$ stand for $\Lambda_c^+,\Sigma_c^+$ and $D,D^*$, respectively, at $\sqrt{s}\lesssim 15$ GeV, which corresponds to the energy range of FAIR. Our consideration is based on the topological decomposition of the planar quark and diquark diagrams which allows to estimate consistently meson and baryon exchange trajectories and energy scale parameters as well. The spin dependence is determined by the effective interaction of lowest exchanged resonance. Unknown parameters are fixed by an independent analysis of open strangeness production in $\bar pp\to \bar YY$ and $\bar pp\to \bar KK$ reactions and of SU(4) symmetry. We present the corresponding cross sections and longitudinal double-spin asymmetries for exclusive binary reactions with open charm mesons and baryons in the final state. The polarization observables have a non-trivial $t$ and $s$ dependence which is sensitive to details of the open charm production mechanism.
|
hep-ph/0402124
|
Emmanuel Lipmanov
|
E. M. Lipmanov
|
Small Q-D neutrino masses from a generic lepton mass hierarchy
|
8 pages, no figures. Revised version. Results unchanged
| null | null | null |
hep-ph
| null |
Exponential lepton mass ratios are studied in a low energy phenomenology. In
view of the known data, the mass patterns of the charged leptons and widely
discussed quasi-degenerate neutrinos are related to one another by two
different traits - opposite mass ratios with large versus small exponents, and
probably conformable mass-degeneracy-deviation hierarchies. The
solar-atmospheric hierarchy parameter should have a special physical meaning in
the Q-D neutrino scenario. A general generic hierarchy equation with two
opposite solutions respectively for the charged lepton and neutrino mass ratios
is considered. It determines a small upper bound on the Q-D neutrino mass
scale, with estimations: m = 0.30 eV at 90% C.L., and m = 0.18 eV at best-fit
mass-squared differences.
|
[
{
"created": "Wed, 11 Feb 2004 19:37:12 GMT",
"version": "v1"
},
{
"created": "Tue, 16 Mar 2004 16:20:21 GMT",
"version": "v2"
}
] |
2007-05-23
|
[
[
"Lipmanov",
"E. M.",
""
]
] |
Exponential lepton mass ratios are studied in a low energy phenomenology. In view of the known data, the mass patterns of the charged leptons and widely discussed quasi-degenerate neutrinos are related to one another by two different traits - opposite mass ratios with large versus small exponents, and probably conformable mass-degeneracy-deviation hierarchies. The solar-atmospheric hierarchy parameter should have a special physical meaning in the Q-D neutrino scenario. A general generic hierarchy equation with two opposite solutions respectively for the charged lepton and neutrino mass ratios is considered. It determines a small upper bound on the Q-D neutrino mass scale, with estimations: m = 0.30 eV at 90% C.L., and m = 0.18 eV at best-fit mass-squared differences.
|
1310.4369
|
Duc Ninh Le
|
Francisco Campanario, Matthias Kerner, Le Duc Ninh, Dieter Zeppenfeld
|
NLO QCD corrections to WZjj production at the LHC
|
4 pages, 4 figures, Proceedings of the inaugural conference Windows
on the Universe, August 2013, Quy Nhon, Vietnam
| null | null |
FTUV-13-1016,IFIC-13-75,KA-TP-32-2013,LPN13-076,SFB/CPP-13-76
|
hep-ph hep-ex
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We present a summary of the first calculation of NLO QCD corrections to WZjj
production with leptonic decays at the LHC. Our results show that the
next-to-leading order corrections reduce significantly the scale uncertainties.
|
[
{
"created": "Wed, 16 Oct 2013 13:32:11 GMT",
"version": "v1"
}
] |
2013-10-17
|
[
[
"Campanario",
"Francisco",
""
],
[
"Kerner",
"Matthias",
""
],
[
"Ninh",
"Le Duc",
""
],
[
"Zeppenfeld",
"Dieter",
""
]
] |
We present a summary of the first calculation of NLO QCD corrections to WZjj production with leptonic decays at the LHC. Our results show that the next-to-leading order corrections reduce significantly the scale uncertainties.
|
1609.09201
|
Vinicius Rodrigues Debastiani
|
V. R. Debastiani, Wei-Hong Liang, Ju-Jun Xie and E. Oset
|
Predictions for $\eta_c \to \eta \pi^+ \pi^-$ producing $f_0(500)$,
$f_0(980)$ and $a_0(980)$
|
7 pages, 6 figures. Formalism revised, new figures, new references
|
Phys. Lett. B 766, 59 (2017)
|
10.1016/j.physletb.2016.12.054
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We perform calculations for the $\eta_c \to \eta \pi^+ \pi^-$ decay using
elements of SU(3) symmetry to see the weight of different trios of
pseudoscalars produced in this decay, prior to the final state interaction of
the mesons. After that, the interaction of pairs of mesons, leading finally to
$\eta \pi^+ \pi^-$, is done using the chiral unitary approach. We evaluate the
$\pi^+ \pi^-$ and $\pi \eta$ mass distributions and find large and clear
signals for $f_0(500)$, $f_0(980)$ and $a_0(980)$ excitation. The reaction is
similar to the $\chi_{c1} \to \eta \pi^+ \pi^-$, which has been recently
measured at BESIII and its implementation and comparison with these predictions
will be very valuable to shed light on the nature of the low mass scalar
mesons.
|
[
{
"created": "Thu, 29 Sep 2016 04:42:05 GMT",
"version": "v1"
},
{
"created": "Mon, 12 Dec 2016 20:27:59 GMT",
"version": "v2"
}
] |
2017-03-17
|
[
[
"Debastiani",
"V. R.",
""
],
[
"Liang",
"Wei-Hong",
""
],
[
"Xie",
"Ju-Jun",
""
],
[
"Oset",
"E.",
""
]
] |
We perform calculations for the $\eta_c \to \eta \pi^+ \pi^-$ decay using elements of SU(3) symmetry to see the weight of different trios of pseudoscalars produced in this decay, prior to the final state interaction of the mesons. After that, the interaction of pairs of mesons, leading finally to $\eta \pi^+ \pi^-$, is done using the chiral unitary approach. We evaluate the $\pi^+ \pi^-$ and $\pi \eta$ mass distributions and find large and clear signals for $f_0(500)$, $f_0(980)$ and $a_0(980)$ excitation. The reaction is similar to the $\chi_{c1} \to \eta \pi^+ \pi^-$, which has been recently measured at BESIII and its implementation and comparison with these predictions will be very valuable to shed light on the nature of the low mass scalar mesons.
|
hep-ph/0612153
|
Christophe Royon
|
C. Royon
|
Diffraction at HERA, the Tevatron and the LHC
|
Lectures at the Zakopane Summer school, Poland
|
ActaPhys.Polon.B37:3571-3602,2006
| null | null |
hep-ph
| null |
In these lectures, we present and discuss the most recent results on
inclusive diffraction from the HERA and Tevatron colliders and give the
prospects for the future at the LHC. Of special interest is the exclusive
production of Higgs boson and heavy objects ($W$, top, stop pairs) which will
require a better understanding of diffractive events and the link between $ep$
and hadronic colliders, as well as precise measurements and analyses of
inclusive diffraction at the LHC in particular to constrain further the gluon
density in the pomeron.
|
[
{
"created": "Tue, 12 Dec 2006 16:18:02 GMT",
"version": "v1"
}
] |
2008-11-26
|
[
[
"Royon",
"C.",
""
]
] |
In these lectures, we present and discuss the most recent results on inclusive diffraction from the HERA and Tevatron colliders and give the prospects for the future at the LHC. Of special interest is the exclusive production of Higgs boson and heavy objects ($W$, top, stop pairs) which will require a better understanding of diffractive events and the link between $ep$ and hadronic colliders, as well as precise measurements and analyses of inclusive diffraction at the LHC in particular to constrain further the gluon density in the pomeron.
|
0811.4168
|
John Conley
|
John A. Conley and James S. Gainer
|
Vector unparticle contributions to lepton g-2
|
16 pages, 11 figures, 2 tables. Included neutrinos in loops. Added
references
| null | null |
SLAC-PUB-13468
|
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
The generic unparticle propagator may be modified in two ways. Breaking the
conformal symmetry effectively adds a mass term to the propagator, while
considering vacuum polarization corrections adds a width-like term. Both of
these modifications result naturally from the coupling of the unparticle to
standard model (SM) fields. We explore how these modifications to the
propagator affect the calculation of the lepton anomalous magnetic moment using
an integral approximation of the propagator that is accurate for
$d\lesssim1.5$, where $d$ is the unparticle dimension. We find that for this
range of $d$ and various values of the conformal breaking scale $\mu$, the
value of $g-2$ calculated when allowing various SM fermions to run in the
unparticle self-energy loops does not significantly deviate from the value of
$g-2$ when the width term is ignored. We also investigate the limits on a
characteristic mass scale for the unparticle sector as a function of $\mu$ and
$d$.
|
[
{
"created": "Tue, 25 Nov 2008 19:56:09 GMT",
"version": "v1"
},
{
"created": "Mon, 2 Feb 2009 17:11:33 GMT",
"version": "v2"
},
{
"created": "Thu, 16 Apr 2009 01:16:07 GMT",
"version": "v3"
}
] |
2009-04-16
|
[
[
"Conley",
"John A.",
""
],
[
"Gainer",
"James S.",
""
]
] |
The generic unparticle propagator may be modified in two ways. Breaking the conformal symmetry effectively adds a mass term to the propagator, while considering vacuum polarization corrections adds a width-like term. Both of these modifications result naturally from the coupling of the unparticle to standard model (SM) fields. We explore how these modifications to the propagator affect the calculation of the lepton anomalous magnetic moment using an integral approximation of the propagator that is accurate for $d\lesssim1.5$, where $d$ is the unparticle dimension. We find that for this range of $d$ and various values of the conformal breaking scale $\mu$, the value of $g-2$ calculated when allowing various SM fermions to run in the unparticle self-energy loops does not significantly deviate from the value of $g-2$ when the width term is ignored. We also investigate the limits on a characteristic mass scale for the unparticle sector as a function of $\mu$ and $d$.
|
2112.09702
|
Kim Berghaus
|
Kim V. Berghaus, Rouven Essig, Yonit Hochberg, Yutaro Shoji, Mukul
Sholapurkar
|
The Phonon Background from Gamma Rays in Sub-GeV Dark Matter Detectors
|
14 pages, 6 figures, 1 table; v2: Added Appendix D with derivation of
solar neutrino background. Added solar neutrino background to Fig.3. Added
acoustic corrections to light-dark-photon signal displayed in Fig.3 with
clarifications in main text. Fixed typos in Fig.3 legend, eq.19, and A25
| null |
10.1103/PhysRevD.106.023026
| null |
hep-ph astro-ph.CO hep-ex
|
http://creativecommons.org/licenses/by/4.0/
|
High-energy photons with $\mathcal{O}$(MeV) energies from radioactive
contaminants can scatter in a solid-state target material and constitute an
important low-energy background for sub-GeV dark matter direct-detection
searches. This background is most noticeable for energy deposits in the $1 -
100$ meV range due to the partially coherent scattering enhancement in the
forward scattering direction. We comprehensively quantify the resulting single-
and multi-phonon background in Si, Ge, GaAs, SiC, and Al$_2$O$_3$ target
materials, which are representative of target materials of interest in low-mass
dark matter searches. We use a realistic representation of the high-energy
photon background, and contrast the expected background phonon spectrum with
the expected dark matter signal phonon spectrum. An active veto is needed to
suppress this background sufficiently in order to allow for the detection of a
dark matter signal, even in well-shielded environments. For comparison we also
show the expected single- and multi-phonon event rates from coherent
neutrino-nucleus scattering due to solar neutrinos, and find that they are
sub-dominant to the photon-induced phonon background.
|
[
{
"created": "Fri, 17 Dec 2021 19:00:00 GMT",
"version": "v1"
},
{
"created": "Tue, 22 Feb 2022 18:17:06 GMT",
"version": "v2"
}
] |
2022-08-17
|
[
[
"Berghaus",
"Kim V.",
""
],
[
"Essig",
"Rouven",
""
],
[
"Hochberg",
"Yonit",
""
],
[
"Shoji",
"Yutaro",
""
],
[
"Sholapurkar",
"Mukul",
""
]
] |
High-energy photons with $\mathcal{O}$(MeV) energies from radioactive contaminants can scatter in a solid-state target material and constitute an important low-energy background for sub-GeV dark matter direct-detection searches. This background is most noticeable for energy deposits in the $1 - 100$ meV range due to the partially coherent scattering enhancement in the forward scattering direction. We comprehensively quantify the resulting single- and multi-phonon background in Si, Ge, GaAs, SiC, and Al$_2$O$_3$ target materials, which are representative of target materials of interest in low-mass dark matter searches. We use a realistic representation of the high-energy photon background, and contrast the expected background phonon spectrum with the expected dark matter signal phonon spectrum. An active veto is needed to suppress this background sufficiently in order to allow for the detection of a dark matter signal, even in well-shielded environments. For comparison we also show the expected single- and multi-phonon event rates from coherent neutrino-nucleus scattering due to solar neutrinos, and find that they are sub-dominant to the photon-induced phonon background.
|
0909.1841
|
Sogee Spinner
|
Pavel Fileviez Perez, Sogee Spinner
|
TeV Scale Spontaneous R-Parity Violation
|
Based on a plenary talk given by P.F.P. at PPC09, OU, May 2009 and
talk given by S.S. at SUSY09, Northeastern Univ., Boston, June 2009
|
AIP Conf.Proc.1200:529-532,2010
|
10.1063/1.3327664
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Understanding the origin or absence of the R-parity violating interactions in
the minimal supersymmetric Standard Model is a vital and open issue. Here we
show that in the minimal B-L models, R-parity and B-L are spontaneously broken
at the TeV scale. We also briefly discuss the phenomenological and cosmological
aspects of these scenarios.
|
[
{
"created": "Wed, 9 Sep 2009 22:07:14 GMT",
"version": "v1"
}
] |
2010-03-16
|
[
[
"Perez",
"Pavel Fileviez",
""
],
[
"Spinner",
"Sogee",
""
]
] |
Understanding the origin or absence of the R-parity violating interactions in the minimal supersymmetric Standard Model is a vital and open issue. Here we show that in the minimal B-L models, R-parity and B-L are spontaneously broken at the TeV scale. We also briefly discuss the phenomenological and cosmological aspects of these scenarios.
|
hep-ph/0509004
|
Marcelo Loewe
|
H. Castillo, C. A. Dominguez, M. Loewe
|
A new determination of the electromagnetic nucleon form factors from QCD
Sum Rules
|
4 pages, 3 figures. Presented at QCD 05: 12th International QCD
Conference, Montpellier, France, 4-9 July 2005
| null | null | null |
hep-ph
| null |
We obtain the electromagnetic form factors of the nucleon, in the space-like
region, using three-point function Finite Energy QCD Sum Rules. The QCD
calculation is performed to leading order in perturbation theory in the chiral
limit, and also to leading order in the non-perturbative power corrections. For
the Dirac form factor, $F_1(q^2)$, we get a very good agreement with the data
for both the proton and the neutron, in the currently accessible experimental
region of momentum transfers. Unfortunately this is not the case, though, for
the Pauli form factor $F_2(q^2)$, which has a soft $q^2$-dependence
proportional to the quark condensate $<0|\bar{q}q|0>$.
|
[
{
"created": "Wed, 31 Aug 2005 21:53:30 GMT",
"version": "v1"
}
] |
2007-05-23
|
[
[
"Castillo",
"H.",
""
],
[
"Dominguez",
"C. A.",
""
],
[
"Loewe",
"M.",
""
]
] |
We obtain the electromagnetic form factors of the nucleon, in the space-like region, using three-point function Finite Energy QCD Sum Rules. The QCD calculation is performed to leading order in perturbation theory in the chiral limit, and also to leading order in the non-perturbative power corrections. For the Dirac form factor, $F_1(q^2)$, we get a very good agreement with the data for both the proton and the neutron, in the currently accessible experimental region of momentum transfers. Unfortunately this is not the case, though, for the Pauli form factor $F_2(q^2)$, which has a soft $q^2$-dependence proportional to the quark condensate $<0|\bar{q}q|0>$.
|
2407.17327
|
Ferdinando Frasc\`a
|
Ferdinando Frasc\`a, Andrea Beraudo and Michael Strickland
|
Far-from-equilibrium attractors in kinetic theory for a mixture of quark
and gluon fluids
| null | null | null | null |
hep-ph nucl-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We exactly solve a Boltzmann equation that describes the dynamics of coupled
massless quark and gluon fluids undergoing transversally homogeneous
longitudinal boost-invariant expansion. We include a fugacity parameter that
allows quarks to be out of chemical equilibrium and we account for the
different collision rates of quarks and gluons, which are related by Casimir
scaling. Based on these assumptions, we numerically determine the evolution of
a large set of moments of the quark and gluon distribution functions and
reconstruct their entire distribution functions. We find that both late and
early-time attractors exist for all moments of the distribution functions
containing more than one power of the squared longitudinal momentum. These
attractors emerge long before the system reaches the regime where hydrodynamic
approximations apply. In addition, we discuss how the shear viscous corrections
and entropy density of the fluid mixture evolve and consider the properties of
their respective attractors. Finally, the entropy production is also
investigated for different initial values of momentum anisotropy and quark
abundance.
|
[
{
"created": "Wed, 24 Jul 2024 14:51:24 GMT",
"version": "v1"
}
] |
2024-07-25
|
[
[
"Frascà",
"Ferdinando",
""
],
[
"Beraudo",
"Andrea",
""
],
[
"Strickland",
"Michael",
""
]
] |
We exactly solve a Boltzmann equation that describes the dynamics of coupled massless quark and gluon fluids undergoing transversally homogeneous longitudinal boost-invariant expansion. We include a fugacity parameter that allows quarks to be out of chemical equilibrium and we account for the different collision rates of quarks and gluons, which are related by Casimir scaling. Based on these assumptions, we numerically determine the evolution of a large set of moments of the quark and gluon distribution functions and reconstruct their entire distribution functions. We find that both late and early-time attractors exist for all moments of the distribution functions containing more than one power of the squared longitudinal momentum. These attractors emerge long before the system reaches the regime where hydrodynamic approximations apply. In addition, we discuss how the shear viscous corrections and entropy density of the fluid mixture evolve and consider the properties of their respective attractors. Finally, the entropy production is also investigated for different initial values of momentum anisotropy and quark abundance.
|
hep-ph/9712219
| null |
Anjan S. Joshipura, V. Ravindran and Sudhir K.Vempati
|
On the charm-squark interpretation of the HERA events
|
LaTex, 14 pages including two figures
|
Phys.Rev.D57:5327-5331,1998
|
10.1103/PhysRevD.57.5327
|
DESY-97-236, PRL-TH-97/029
|
hep-ph
| null |
The charm squark resonance in the $e^+ q$ channel provides one of the
plausible interpretations of the reported anomaly at HERA. We show that the
relevant $R$ violating coupling $\lambda'_{121}$ is required to be large,
typically around 0.1 in a large class of supergravity based models including
the minimal one with the universal boundary condition at the GUT scale.
Existing constraints on this coupling are reanalysed in this light and it is
argued that a large $\lambda'_{121}$ may be feasible but would require fine
tuned cancelations.
|
[
{
"created": "Mon, 1 Dec 1997 17:04:10 GMT",
"version": "v1"
}
] |
2019-08-17
|
[
[
"Joshipura",
"Anjan S.",
""
],
[
"Ravindran",
"V.",
""
],
[
"Vempati",
"Sudhir K.",
""
]
] |
The charm squark resonance in the $e^+ q$ channel provides one of the plausible interpretations of the reported anomaly at HERA. We show that the relevant $R$ violating coupling $\lambda'_{121}$ is required to be large, typically around 0.1 in a large class of supergravity based models including the minimal one with the universal boundary condition at the GUT scale. Existing constraints on this coupling are reanalysed in this light and it is argued that a large $\lambda'_{121}$ may be feasible but would require fine tuned cancelations.
|
1908.00921
|
Zhiqing Zhang
|
M. Davier, A. Hoecker, B. Malaescu, and Z. Zhang
|
A new evaluation of the hadronic vacuum polarisation contributions to
the muon anomalous magnetic moment and to $\mathbf{\boldsymbol\alpha(m_Z^2)}$
|
13 pages, 9 figures and 2 tables, published version in EPJ-C. arXiv
admin note: substantial text overlap with arXiv:1706.09436
|
Eur. Phys. J. C 80 (2020) 241
|
10.1140/epjc/s10052-020-7792-2
| null |
hep-ph hep-ex
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We reevaluate the hadronic vacuum polarisation contributions to the muon
magnetic anomaly and to the running of the electromagnetic coupling constant at
the $Z$-boson mass. We include newest $e^+e^- \to$ hadrons cross-section data
together with a phenomenological fit of the threshold region in the evaluation
of the dispersion integrals. The precision in the individual datasets cannot be
fully exploited due to discrepancies that lead to additional systematic
uncertainty in particular between BABAR and KLOE data in the dominant
$\pi^+\pi^-$ channel. For the muon $(g-2)/2$, we find for the lowest-order
hadronic contribution $(694.0 \pm 4.0)\cdot10^{-10}$. The full Standard Model
prediction differs by $3.3\sigma$ from the experimental value. The five-quark
hadronic contribution to $\alpha(m_Z^2)$ is evaluated to be
$(276.0\pm1.0)\cdot10^{-4}$.
|
[
{
"created": "Wed, 31 Jul 2019 18:00:23 GMT",
"version": "v1"
},
{
"created": "Sat, 31 Aug 2019 07:20:06 GMT",
"version": "v2"
},
{
"created": "Tue, 17 Mar 2020 12:58:12 GMT",
"version": "v3"
}
] |
2020-03-19
|
[
[
"Davier",
"M.",
""
],
[
"Hoecker",
"A.",
""
],
[
"Malaescu",
"B.",
""
],
[
"Zhang",
"Z.",
""
]
] |
We reevaluate the hadronic vacuum polarisation contributions to the muon magnetic anomaly and to the running of the electromagnetic coupling constant at the $Z$-boson mass. We include newest $e^+e^- \to$ hadrons cross-section data together with a phenomenological fit of the threshold region in the evaluation of the dispersion integrals. The precision in the individual datasets cannot be fully exploited due to discrepancies that lead to additional systematic uncertainty in particular between BABAR and KLOE data in the dominant $\pi^+\pi^-$ channel. For the muon $(g-2)/2$, we find for the lowest-order hadronic contribution $(694.0 \pm 4.0)\cdot10^{-10}$. The full Standard Model prediction differs by $3.3\sigma$ from the experimental value. The five-quark hadronic contribution to $\alpha(m_Z^2)$ is evaluated to be $(276.0\pm1.0)\cdot10^{-4}$.
|
1402.1275
|
Andrea De Simone
|
Giorgio Busoni, Andrea De Simone, Johanna Gramling, Enrico Morgante,
Antonio Riotto
|
On the Validity of the Effective Field Theory for Dark Matter Searches
at the LHC, Part II: Complete Analysis for the s-channel
|
24 pages, 8 figures. References added and minor corrections made to
match published version
|
JCAP 1406:060,2014
|
10.1088/1475-7516/2014/06/060
|
SISSA 04/2014/FISI
|
hep-ph hep-ex
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We generalize in several directions our recent analysis of the limitations to
the use of the effective field theory approach to study dark matter at the LHC.
Firstly, we study the full list of operators connecting fermion DM to quarks
and gluons, corresponding to integrating out a heavy mediator in the
$s$-channel; secondly, we provide analytical results for the validity of the
EFT description for both $\sqrt{s}=8$ {\rm TeV} and $14$ {\rm TeV}; thirdly, we
make use of a MonteCarlo event generator approach to assess the validity of our
analytical conclusions. We apply our results to revisit the current collider
bounds on the ultraviolet cut-off scale of the effective field theory and show
that these bounds are weakened once the validity conditions of the effective
field theory are imposed.
|
[
{
"created": "Thu, 6 Feb 2014 08:54:00 GMT",
"version": "v1"
},
{
"created": "Mon, 30 Jun 2014 07:13:24 GMT",
"version": "v2"
}
] |
2014-07-01
|
[
[
"Busoni",
"Giorgio",
""
],
[
"De Simone",
"Andrea",
""
],
[
"Gramling",
"Johanna",
""
],
[
"Morgante",
"Enrico",
""
],
[
"Riotto",
"Antonio",
""
]
] |
We generalize in several directions our recent analysis of the limitations to the use of the effective field theory approach to study dark matter at the LHC. Firstly, we study the full list of operators connecting fermion DM to quarks and gluons, corresponding to integrating out a heavy mediator in the $s$-channel; secondly, we provide analytical results for the validity of the EFT description for both $\sqrt{s}=8$ {\rm TeV} and $14$ {\rm TeV}; thirdly, we make use of a MonteCarlo event generator approach to assess the validity of our analytical conclusions. We apply our results to revisit the current collider bounds on the ultraviolet cut-off scale of the effective field theory and show that these bounds are weakened once the validity conditions of the effective field theory are imposed.
|
1407.7037
|
Eder Izaguirre
|
Eder Izaguirre, Brian Shuve, Itay Yavin
|
A New Observable for Identifying Dijet Resonances
|
6 pages, 6 figures. Version to appear in PRL
|
Phys. Rev. Lett. 114, 041802 (2015)
|
10.1103/PhysRevLett.114.041802
| null |
hep-ph hep-ex
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
The development of techniques for identifying hadronic signals from the
overwhelming multi-jet backgrounds is an important part of the Large Hadron
Collider (LHC) program. Of prime importance are resonances decaying into a pair
of partons, such as the Higgs and $\rm W$/$\rm Z$ bosons, as well as
hypothetical new particles. We present a simple observable to help discriminate
a dijet resonance from background that is effective even when the decaying
resonance is not strongly boosted. We find consistent performance of the
observable over a variety of processes and degree of boosts, and show that it
leads to a reduction of the background by a factor of $3-5$ relative to signal
at the price of $10-20\%$ signal efficiency. This approach represents a
significant increase in sensitivity for Standard Model (SM) measurements and
searches for new physics that are dominated by systematic uncertainties, which
is true of many analyses involving jets - particularly in the high-luminosity
running of the LHC.
|
[
{
"created": "Fri, 25 Jul 2014 20:00:07 GMT",
"version": "v1"
},
{
"created": "Sun, 11 Jan 2015 15:58:38 GMT",
"version": "v2"
}
] |
2015-03-05
|
[
[
"Izaguirre",
"Eder",
""
],
[
"Shuve",
"Brian",
""
],
[
"Yavin",
"Itay",
""
]
] |
The development of techniques for identifying hadronic signals from the overwhelming multi-jet backgrounds is an important part of the Large Hadron Collider (LHC) program. Of prime importance are resonances decaying into a pair of partons, such as the Higgs and $\rm W$/$\rm Z$ bosons, as well as hypothetical new particles. We present a simple observable to help discriminate a dijet resonance from background that is effective even when the decaying resonance is not strongly boosted. We find consistent performance of the observable over a variety of processes and degree of boosts, and show that it leads to a reduction of the background by a factor of $3-5$ relative to signal at the price of $10-20\%$ signal efficiency. This approach represents a significant increase in sensitivity for Standard Model (SM) measurements and searches for new physics that are dominated by systematic uncertainties, which is true of many analyses involving jets - particularly in the high-luminosity running of the LHC.
|
2112.01029
|
Ahmad Mohamadnejad
|
Seyed Yaser Ayazi and Ahmad Mohamadnejad
|
Thermal Leptophilic Light Vector Dark Matter with Spinor Mediator and
Muon (g-2) Anomaly
|
15 pages, 6 figures
|
Int.J.Theor.Phys. 62 (2023) 1
|
10.1007/s10773-022-05252-1
| null |
hep-ph
|
http://creativecommons.org/licenses/by/4.0/
|
Inspired by the recently new measurement of $(g-2)_{\mu}$ at FermiLab and
reported upper bound for electron-dark matter (DM) recoil by the XENON1T
collaboration, we revisited phenomenology of a light MeV scale vector dark
matter in a leptophilic extension of standard model while a new spinor field
plays the role of mediator. A viable parameter space is considered to discuss
the possibility of light dark matter relic density as well as anomalous
magnetic moment of the muon. We study DM-electron direct detection and
cosmological bounds on the parameters space of the model. It is shown that
although new bound of $(g-2)_{\mu}$ anomaly greatly confines the parametric
space of the model, the thermal light dark matter can exist for $\rm M_{DM}\sim
10^{-1}-10^{1}~\rm GeV$.
|
[
{
"created": "Thu, 2 Dec 2021 07:40:31 GMT",
"version": "v1"
},
{
"created": "Wed, 2 Mar 2022 07:52:57 GMT",
"version": "v2"
},
{
"created": "Sat, 18 Feb 2023 13:37:08 GMT",
"version": "v3"
}
] |
2023-02-21
|
[
[
"Ayazi",
"Seyed Yaser",
""
],
[
"Mohamadnejad",
"Ahmad",
""
]
] |
Inspired by the recently new measurement of $(g-2)_{\mu}$ at FermiLab and reported upper bound for electron-dark matter (DM) recoil by the XENON1T collaboration, we revisited phenomenology of a light MeV scale vector dark matter in a leptophilic extension of standard model while a new spinor field plays the role of mediator. A viable parameter space is considered to discuss the possibility of light dark matter relic density as well as anomalous magnetic moment of the muon. We study DM-electron direct detection and cosmological bounds on the parameters space of the model. It is shown that although new bound of $(g-2)_{\mu}$ anomaly greatly confines the parametric space of the model, the thermal light dark matter can exist for $\rm M_{DM}\sim 10^{-1}-10^{1}~\rm GeV$.
|
hep-ph/0005127
|
Andrey Onishenko
|
Andrei I. Onishchenko (ITEP, Moscow)
|
B_c - meson sum rules at next-to-leading order
|
21 pages, 5 figues
| null | null | null |
hep-ph
| null |
We present B_c-meson two-point sum rules at next-to-leading order in NRQCD
approximation. Analitycal results for perturbative spectral density and gluon
condensate contribution with account for summed Coulomb corrections are given.
Estimates of various c-quark masses together with couplings and masses of
lowest lying B_c-meson resonances are performed.
|
[
{
"created": "Sat, 13 May 2000 14:11:35 GMT",
"version": "v1"
}
] |
2007-05-23
|
[
[
"Onishchenko",
"Andrei I.",
"",
"ITEP, Moscow"
]
] |
We present B_c-meson two-point sum rules at next-to-leading order in NRQCD approximation. Analitycal results for perturbative spectral density and gluon condensate contribution with account for summed Coulomb corrections are given. Estimates of various c-quark masses together with couplings and masses of lowest lying B_c-meson resonances are performed.
|
hep-ph/9511320
|
Ulf Meissner
|
B. Borasoy and Ulf-G. Mei{\ss}ner
|
Chiral Lagrangians for Baryons coupled to massive Spin-1 Fields
|
26 pp, LaTeX, uses epsf and elsart12.sty, 3 figures in separate
self-unpacking file
|
Int.J.Mod.Phys. A11 (1996) 5183
|
10.1142/S0217751X96002376
|
TK 95 31
|
hep-ph nucl-th
| null |
We analyze the effective low--energy field theory of Goldstone bosons and
baryons chirally coupled to massive spin--1 fields. We use the electromagnetic
baryon form factors to demonstrate the formal equivalence between the vector
and the tensor field formulation for the spin--1 fields. We also discuss the
origin of the so--called Weinberg term in pion--nucleon scattering and the role
of $\rho$--meson exchange. Chirally coupled vector mesons do not give rise to
this two--pion nucleon seagull interaction but rather to higher order
corrections. Some problems of the formal equivalence arising in higher orders
and related to loops are touched upon.
|
[
{
"created": "Wed, 15 Nov 1995 07:15:30 GMT",
"version": "v1"
}
] |
2015-06-25
|
[
[
"Borasoy",
"B.",
""
],
[
"Meißner",
"Ulf-G.",
""
]
] |
We analyze the effective low--energy field theory of Goldstone bosons and baryons chirally coupled to massive spin--1 fields. We use the electromagnetic baryon form factors to demonstrate the formal equivalence between the vector and the tensor field formulation for the spin--1 fields. We also discuss the origin of the so--called Weinberg term in pion--nucleon scattering and the role of $\rho$--meson exchange. Chirally coupled vector mesons do not give rise to this two--pion nucleon seagull interaction but rather to higher order corrections. Some problems of the formal equivalence arising in higher orders and related to loops are touched upon.
|
0811.0298
|
Jae Ho Heo
|
Jae Ho Heo
|
About a peculiar U(1): Z' discovery limit, muon anomalous magnetic
moment and electron electric dipole moment
|
16 pages, 6 figures
|
Phys.Rev.D80:033001,2009
|
10.1103/PhysRevD.80.033001
| null |
hep-ph
|
http://creativecommons.org/licenses/by/3.0/
|
The model (Lagrangian) with a peculiar extra U(1)is clearly presented. The
assigned extra U(1) gauge charges give a strong constraint to build
Lagrangians. The Z' discovery limits are estimated and predicted at the
Tevatron and the LHC. The new contributions of the muon anomalous magnetic
moment are investigated at one and two loops, and we predict that the deviation
from the standard model may be explained. The electron electric dipole moment
could also be generated because of the explicit CP violation effect in the
Higgs sector, and a sizable contribution is expected for a moderately sized CP
phase(argument of the CP-odd Higgs).
|
[
{
"created": "Mon, 3 Nov 2008 13:35:19 GMT",
"version": "v1"
},
{
"created": "Thu, 30 Jul 2009 03:29:48 GMT",
"version": "v2"
}
] |
2010-04-28
|
[
[
"Heo",
"Jae Ho",
""
]
] |
The model (Lagrangian) with a peculiar extra U(1)is clearly presented. The assigned extra U(1) gauge charges give a strong constraint to build Lagrangians. The Z' discovery limits are estimated and predicted at the Tevatron and the LHC. The new contributions of the muon anomalous magnetic moment are investigated at one and two loops, and we predict that the deviation from the standard model may be explained. The electron electric dipole moment could also be generated because of the explicit CP violation effect in the Higgs sector, and a sizable contribution is expected for a moderately sized CP phase(argument of the CP-odd Higgs).
|
1309.7468
|
Makoto C. Fujiwara
|
Makoto C. Fujiwara (TRIUMF / Univ. of Calgary)
|
Antihydrogen, CPT, and Naturalness
|
Based on an invited talk at CPT'13 -- the Sixth Meeting on CPT and
Lorentz Symmetry, Bloomington, Indiana, June 17-21, 2013
| null |
10.1142/9789814566438_0002
| null |
hep-ph hep-ex nucl-ex physics.atom-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Studying fundamental symmetries of Nature has proven fruitful in particle
physics. I argue that recent results at the LHC, and the naturalness problem
highlighted by them, provide a renewed motivation for tests of CPT symmetry as
a probe for physics beyond quantum field theory. I also discuss prospects for
antihydrogen CPT tests with sensitivities to Planck scale suppressed effects.
|
[
{
"created": "Sat, 28 Sep 2013 15:53:09 GMT",
"version": "v1"
}
] |
2017-08-23
|
[
[
"Fujiwara",
"Makoto C.",
"",
"TRIUMF / Univ. of Calgary"
]
] |
Studying fundamental symmetries of Nature has proven fruitful in particle physics. I argue that recent results at the LHC, and the naturalness problem highlighted by them, provide a renewed motivation for tests of CPT symmetry as a probe for physics beyond quantum field theory. I also discuss prospects for antihydrogen CPT tests with sensitivities to Planck scale suppressed effects.
|
2109.14237
|
Zhi-Hui Guo
|
Meng-Lin Du, Zhi-Hui Guo and J. A. Oller
|
Insights into the nature of the $P_{cs}(4459)$
|
23 pages, 1 figure
| null | null | null |
hep-ph hep-ex
|
http://creativecommons.org/licenses/by/4.0/
|
We study the nature of the recently observed $P_{cs}(4459)$ by the LHCb
collaboration by employing three methods based on the elastic effective-range
expansion and the resulting size of the effective-range, the saturation of the
compositeness relation and width of the resonance, and a direct fit to data
involving the channels $J/\psi\Lambda$, $\Xi'_c\bar{D}$ and $\Xi_c\bar{D}^*$.
We have also considered the addition of a CDD pole but this scenario can be
discarded. Our different analyses clearly indicate the molecular nature of the
$P_{cs}(4459)$ with a clear $\Xi_c\bar{D}^*$ dominant component. In relation
with heavy-quark-spin symmetry our results also favor the actual existence of
two resonances with $J=1/2$ (the lighter one) and $3/2$ (the heavier one) in
the energy region of the $P_{cs}(4459)$. In the scenario of two-resonance for
the $P_{cs}(4459)$, the inclusion of the $\Xi_c'\bar{D}$ channel is required
for the their mass splitting and it allows one to determine the spin structures
of the two resonances.
|
[
{
"created": "Wed, 29 Sep 2021 07:21:13 GMT",
"version": "v1"
}
] |
2021-09-30
|
[
[
"Du",
"Meng-Lin",
""
],
[
"Guo",
"Zhi-Hui",
""
],
[
"Oller",
"J. A.",
""
]
] |
We study the nature of the recently observed $P_{cs}(4459)$ by the LHCb collaboration by employing three methods based on the elastic effective-range expansion and the resulting size of the effective-range, the saturation of the compositeness relation and width of the resonance, and a direct fit to data involving the channels $J/\psi\Lambda$, $\Xi'_c\bar{D}$ and $\Xi_c\bar{D}^*$. We have also considered the addition of a CDD pole but this scenario can be discarded. Our different analyses clearly indicate the molecular nature of the $P_{cs}(4459)$ with a clear $\Xi_c\bar{D}^*$ dominant component. In relation with heavy-quark-spin symmetry our results also favor the actual existence of two resonances with $J=1/2$ (the lighter one) and $3/2$ (the heavier one) in the energy region of the $P_{cs}(4459)$. In the scenario of two-resonance for the $P_{cs}(4459)$, the inclusion of the $\Xi_c'\bar{D}$ channel is required for the their mass splitting and it allows one to determine the spin structures of the two resonances.
|
0911.4403
|
Maximiliano Rivera Dr.
|
Marco A. Diaz, Maximiliano A. Rivera, Douglas A. Ross
|
NLO Polarized Chargino pair Production in Electron Positron Annihilation
|
25 pages, 13 figures
|
JHEP 1004:098,2010
|
10.1007/JHEP04(2010)098
|
USM-TH-252
|
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We calculate the complete one-loop quantum corrections to the helicity
eigenstate chargino pair production cross sections in polarized electron
positron collisions, within the Minimal Supersymmetric Standard Model. We
calculate the non-QED corrections using the helicity amplitudes formalism, and
Dimensional Regularization to deal with ultraviolet divergences. We calculate
QED corrections using the dipole subtraction formalism to extract soft and
collinear divergences in Bremsstrahlung, canceling them with the infrared
divergences from virtual QED corrections. We show numerical results for the
Focus Point scenario in mSUGRA, where we find important quantum corrections for
differential cross sections with definite chargino helicities.
|
[
{
"created": "Mon, 23 Nov 2009 13:50:39 GMT",
"version": "v1"
}
] |
2010-05-25
|
[
[
"Diaz",
"Marco A.",
""
],
[
"Rivera",
"Maximiliano A.",
""
],
[
"Ross",
"Douglas A.",
""
]
] |
We calculate the complete one-loop quantum corrections to the helicity eigenstate chargino pair production cross sections in polarized electron positron collisions, within the Minimal Supersymmetric Standard Model. We calculate the non-QED corrections using the helicity amplitudes formalism, and Dimensional Regularization to deal with ultraviolet divergences. We calculate QED corrections using the dipole subtraction formalism to extract soft and collinear divergences in Bremsstrahlung, canceling them with the infrared divergences from virtual QED corrections. We show numerical results for the Focus Point scenario in mSUGRA, where we find important quantum corrections for differential cross sections with definite chargino helicities.
|
0812.2442
|
Howard Baer
|
Howard Baer
|
Dark matter from SUGRA GUTs: mSUGRA, NUSUGRA and Yukawa-unified SUGRA
|
to be published in Proceedings of 8th UCLA Symposium on Sources and
Detection of Dark Matter and Dark Energy in the Universe
| null |
10.1063/1.3232200
| null |
hep-ph astro-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Gravity-mediated SUSY breaking models with R-parity conservation give rise to
dark matter in the universe. I review neutralino dark matter in the minimal
supergravity model (mSUGRA), models with non-universal soft SUSY breaking terms
(NUSUGRA) which yield a well-tempered neutralino, and models with unified
Yukawa couplings at the GUT scale (as may occur in an SO(10) SUSY GUT theory).
These latter models have difficulty accommodating neutralino dark matter, but
work very well if the dark matter particles are axions and axinos.
|
[
{
"created": "Fri, 12 Dec 2008 18:04:15 GMT",
"version": "v1"
}
] |
2015-05-13
|
[
[
"Baer",
"Howard",
""
]
] |
Gravity-mediated SUSY breaking models with R-parity conservation give rise to dark matter in the universe. I review neutralino dark matter in the minimal supergravity model (mSUGRA), models with non-universal soft SUSY breaking terms (NUSUGRA) which yield a well-tempered neutralino, and models with unified Yukawa couplings at the GUT scale (as may occur in an SO(10) SUSY GUT theory). These latter models have difficulty accommodating neutralino dark matter, but work very well if the dark matter particles are axions and axinos.
|
0909.1070
|
Pankaj Jain
|
Pavan K. Aluri, Pankaj Jain, Subhadip Mitra, Sukanta Panda and Naveen
K. Singh
|
Constraints on the Cosmological Constant due to Scale Invariance
|
17 pages, no figures, revised version, no change in results or
conclusions
|
Mod.Phys.Lett.A25:1349-1364,2010
|
10.1142/S0217732310032561
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We consider the standard model with local scale invariance. The theory shows
exact scale invariance of dimensionally regulated action. We show that massless
gauge fields, which may be abelian or non-abelian, lead to vanishing
contribution to the cosmological constant in this theory. This result follows
in the quantum theory, to all orders in the gauge couplings. However we have
not considered contributions higher orders in the gravitational coupling.
Similarly we also find that massless fermion fields yield null contribution to
the cosmological constant. The effective cosmological constant in this theory
is non-zero due to the phenomenon of cosmological symmetry breaking, which also
gives masses to all the massive fields, besides generating the Planck mass. We
find a simple relationship between the curvature scalar and the vacuum value of
the Higgs field in the limit when we ignore all other contributions to the
energy density besides the vacuum energy.
|
[
{
"created": "Sun, 6 Sep 2009 06:38:30 GMT",
"version": "v1"
},
{
"created": "Thu, 10 Dec 2009 04:21:02 GMT",
"version": "v2"
}
] |
2010-08-19
|
[
[
"Aluri",
"Pavan K.",
""
],
[
"Jain",
"Pankaj",
""
],
[
"Mitra",
"Subhadip",
""
],
[
"Panda",
"Sukanta",
""
],
[
"Singh",
"Naveen K.",
""
]
] |
We consider the standard model with local scale invariance. The theory shows exact scale invariance of dimensionally regulated action. We show that massless gauge fields, which may be abelian or non-abelian, lead to vanishing contribution to the cosmological constant in this theory. This result follows in the quantum theory, to all orders in the gauge couplings. However we have not considered contributions higher orders in the gravitational coupling. Similarly we also find that massless fermion fields yield null contribution to the cosmological constant. The effective cosmological constant in this theory is non-zero due to the phenomenon of cosmological symmetry breaking, which also gives masses to all the massive fields, besides generating the Planck mass. We find a simple relationship between the curvature scalar and the vacuum value of the Higgs field in the limit when we ignore all other contributions to the energy density besides the vacuum energy.
|
2406.03745
|
Santiago Bernal-Langarica
|
Alejandro Ayala, Santiago Bernal-Langarica, Daryel Manreza-Paret
|
Estimate for the neutrino magnetic moment from pulsar kick velocities
induced at the birth of strange quark matter neutron stars
|
7 pages, no figures. Version accepted for publication in Universe
|
Universe 2024, 10(7), 301
|
10.3390/universe10070301
| null |
hep-ph astro-ph.HE
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We estimate the magnetic moment of electron neutrinos by computing the
neutrino chirality flip rate that can occur in the core of a strange quark
matter neutron star at birth. We show that this process allows neutrinos to
anisotropically escape, thus inducing the star kick velocity. Although the flip
from left- to right-handed neutrinos is assumed to happen in equilibrium, the
no-go theorem does not apply because right-handed neutrinos do not interact
with matter and the reverse process does not happen, producing the loss of
detailed balance. For simplicity, we model the star core as consisting of
strange quark matter. We find that even when the energy released in
right-handed neutrinos is a small fraction of the total energy released in
left-handed neutrinos, the process describes kick velocities for natal
conditions, which are consistent with the observed ones and span the correct
range of radii, temperatures and chemical potentials for typical magnetic field
intensities. The neutrino magnetic moment is estimated to be $\mu_\nu \sim 3.6
\times 10^{-18}\mu_B$, where $\mu_B$ is the Bohr magneton. This value is more
stringent than the bound found for massive neutrinos in a minimal extension of
the \mbox{standard model.}
|
[
{
"created": "Thu, 6 Jun 2024 04:45:48 GMT",
"version": "v1"
},
{
"created": "Wed, 24 Jul 2024 18:48:57 GMT",
"version": "v2"
}
] |
2024-07-26
|
[
[
"Ayala",
"Alejandro",
""
],
[
"Bernal-Langarica",
"Santiago",
""
],
[
"Manreza-Paret",
"Daryel",
""
]
] |
We estimate the magnetic moment of electron neutrinos by computing the neutrino chirality flip rate that can occur in the core of a strange quark matter neutron star at birth. We show that this process allows neutrinos to anisotropically escape, thus inducing the star kick velocity. Although the flip from left- to right-handed neutrinos is assumed to happen in equilibrium, the no-go theorem does not apply because right-handed neutrinos do not interact with matter and the reverse process does not happen, producing the loss of detailed balance. For simplicity, we model the star core as consisting of strange quark matter. We find that even when the energy released in right-handed neutrinos is a small fraction of the total energy released in left-handed neutrinos, the process describes kick velocities for natal conditions, which are consistent with the observed ones and span the correct range of radii, temperatures and chemical potentials for typical magnetic field intensities. The neutrino magnetic moment is estimated to be $\mu_\nu \sim 3.6 \times 10^{-18}\mu_B$, where $\mu_B$ is the Bohr magneton. This value is more stringent than the bound found for massive neutrinos in a minimal extension of the \mbox{standard model.}
|
hep-ph/9804222
|
Ramon Mendez Galain
|
I. Bediaga, R.E. Blanco, C. G\"obel, and R. M\'endez--Galain
|
Procedure for direct measurement of the Cabibbo-Kobayashi-Maskawa angle
$\gamma$
|
Version to appear in Physical Review Letters
|
Phys.Rev.Lett.81:4067-4070,1998
|
10.1103/PhysRevLett.81.4067
| null |
hep-ph hep-ex
| null |
A natural procedure is presented to measure the angle $\gamma$ from the decay
$B^{\pm} \to \pi^{\pm}\pi^+\pi^-$. It is based in the Dalitz plot fitting
analysis. Neither amplitudes nor strong phases have to be known a priori. We
present simulations of this decay computing both statistical and theoretical
uncertainties and analyze the experimental feasibility. We found that $\gamma$
could be measured with a combined error of the order of 20$^o$ with 90% of CL
after about a couple of years of running of the first generation of B
factories.
|
[
{
"created": "Fri, 3 Apr 1998 00:29:59 GMT",
"version": "v1"
},
{
"created": "Sat, 7 Nov 1998 01:34:00 GMT",
"version": "v2"
}
] |
2010-11-23
|
[
[
"Bediaga",
"I.",
""
],
[
"Blanco",
"R. E.",
""
],
[
"Göbel",
"C.",
""
],
[
"Méndez--Galain",
"R.",
""
]
] |
A natural procedure is presented to measure the angle $\gamma$ from the decay $B^{\pm} \to \pi^{\pm}\pi^+\pi^-$. It is based in the Dalitz plot fitting analysis. Neither amplitudes nor strong phases have to be known a priori. We present simulations of this decay computing both statistical and theoretical uncertainties and analyze the experimental feasibility. We found that $\gamma$ could be measured with a combined error of the order of 20$^o$ with 90% of CL after about a couple of years of running of the first generation of B factories.
|
2401.14119
|
Ricardo Aguirre
|
R. M. Aguirre and O. Louren\c{c}o
|
Pseudoscalar mesons from a PNJL model at zero temperature
|
14 pages, 12 figures
| null | null | null |
hep-ph nucl-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We study pseudoscalar $\pi$, $K$ and $\eta$ meson properties, such as masses
and couplings, in dense matter at zero temperature. We use a recently proposed
phenomenological quark model, known as the PNJL0, which takes into account the
confinement/deconfinement phase transition by means of the traced Polyakov loop
($\Phi$) which serves as an order parameter at zero temperature. We consider
two different scenarios, namely, symmetric quark matter with equal chemical
potentials for all the flavors, and the beta equilibrated matter. In the latter
case the hadron-quark phase transition is implemented by a two model approach.
For the hadron side we use a relativistic mean-field model with density
dependent couplings. We show that $\Phi$ induces abrupt changes in the mesons
properties with gap sizes regulated by the phenomenological gluonic sector of
the model.
|
[
{
"created": "Thu, 25 Jan 2024 11:56:30 GMT",
"version": "v1"
}
] |
2024-01-26
|
[
[
"Aguirre",
"R. M.",
""
],
[
"Lourenço",
"O.",
""
]
] |
We study pseudoscalar $\pi$, $K$ and $\eta$ meson properties, such as masses and couplings, in dense matter at zero temperature. We use a recently proposed phenomenological quark model, known as the PNJL0, which takes into account the confinement/deconfinement phase transition by means of the traced Polyakov loop ($\Phi$) which serves as an order parameter at zero temperature. We consider two different scenarios, namely, symmetric quark matter with equal chemical potentials for all the flavors, and the beta equilibrated matter. In the latter case the hadron-quark phase transition is implemented by a two model approach. For the hadron side we use a relativistic mean-field model with density dependent couplings. We show that $\Phi$ induces abrupt changes in the mesons properties with gap sizes regulated by the phenomenological gluonic sector of the model.
|
hep-ph/9703216
|
Peter Overmann
|
D. Bruss, O. Nachtmann, P. Overmann
|
CP Violation in radiative Z Decays
|
19 pages, Latex, 4 Figures in PostScript format
|
Eur.Phys.J.C1:191-199,1998
|
10.1007/BF01245808
|
HD-THEP-97-2
|
hep-ph
| null |
We propose to test the CP symmetry in the reactions Z -> mu+ mu- gamma and Z
-> tau+ tau- gamma. The experimental analysis of angular correlations allows to
determine a set of effective couplings: the electric and weak dipole moments of
the muon and the tau lepton, and in particular chirality conserving 4-particle
couplings, all of which can be induced by CP--violation in renormalizable
theories of electroweak interactions beyond the Standard Model. We update an
indirect bound on the weak dipole moment of the muon.
|
[
{
"created": "Mon, 3 Mar 1997 12:11:58 GMT",
"version": "v1"
}
] |
2015-06-25
|
[
[
"Bruss",
"D.",
""
],
[
"Nachtmann",
"O.",
""
],
[
"Overmann",
"P.",
""
]
] |
We propose to test the CP symmetry in the reactions Z -> mu+ mu- gamma and Z -> tau+ tau- gamma. The experimental analysis of angular correlations allows to determine a set of effective couplings: the electric and weak dipole moments of the muon and the tau lepton, and in particular chirality conserving 4-particle couplings, all of which can be induced by CP--violation in renormalizable theories of electroweak interactions beyond the Standard Model. We update an indirect bound on the weak dipole moment of the muon.
|
1107.5004
|
Manuel Toharia
|
Mariana Frank, Beste Korutlu, and Manuel Toharia
|
Higgs Phenomenology in Warped Extra-Dimensions with a 4th Generation
|
39 pages, 6 figures
| null |
10.1103/PhysRevD.84.075009
|
CUMQ/HEP 162
|
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We study a warped extra-dimension scenario where the Standard Model fields
lie in the bulk, with the addition of a fourth family of fermions. We
concentrate on the flavor structure of the Higgs couplings with fermions in the
flavor anarchy ansatz. Even without a fourth family, these couplings will be
generically misaligned with respect to the SM fermion mass matrices. The
presence of the fourth family typically enhances the misalignment effects and
we show that one should expect them to be highly non-symmetrical in the
${(34)}$ inter-generational mixing. The radiative corrections from the new
fermions and their flavor violating couplings to the Higgs affect negligibly
known experimental precision measurements such as the oblique parameters and
$Z\to b {\bar b}$ or $Z \to \mu^+ \mu^-$. On the other hand, $\Delta F=1,2$
processes, mediated by tree-level Higgs exchange, as well as radiative
corrections to $b \to s \gamma$ and $\mu \to e\gamma$ put some generic pressure
on the allowed size of the flavor violating couplings. But more importantly,
these couplings will alter the Higgs decay patterns as well as those of the new
fermions, and produce very interesting new signals associated to Higgs
phenomenology in high energy colliders. These might become very important
indirect signals for these type of models as they would be present even when
the KK mass scale is high and no heavy KK particle is discovered.
|
[
{
"created": "Mon, 25 Jul 2011 17:25:53 GMT",
"version": "v1"
}
] |
2015-05-28
|
[
[
"Frank",
"Mariana",
""
],
[
"Korutlu",
"Beste",
""
],
[
"Toharia",
"Manuel",
""
]
] |
We study a warped extra-dimension scenario where the Standard Model fields lie in the bulk, with the addition of a fourth family of fermions. We concentrate on the flavor structure of the Higgs couplings with fermions in the flavor anarchy ansatz. Even without a fourth family, these couplings will be generically misaligned with respect to the SM fermion mass matrices. The presence of the fourth family typically enhances the misalignment effects and we show that one should expect them to be highly non-symmetrical in the ${(34)}$ inter-generational mixing. The radiative corrections from the new fermions and their flavor violating couplings to the Higgs affect negligibly known experimental precision measurements such as the oblique parameters and $Z\to b {\bar b}$ or $Z \to \mu^+ \mu^-$. On the other hand, $\Delta F=1,2$ processes, mediated by tree-level Higgs exchange, as well as radiative corrections to $b \to s \gamma$ and $\mu \to e\gamma$ put some generic pressure on the allowed size of the flavor violating couplings. But more importantly, these couplings will alter the Higgs decay patterns as well as those of the new fermions, and produce very interesting new signals associated to Higgs phenomenology in high energy colliders. These might become very important indirect signals for these type of models as they would be present even when the KK mass scale is high and no heavy KK particle is discovered.
|
2209.05380
|
Saad Nabeebaccus
|
Goran Duplan\v{c}i\'c, Saad Nabeebaccus, Kornelija
Passek-Kumeri\v{c}ki, Bernard Pire, Lech Szymanowski and Samuel Wallon
|
Accessing GPDs through the exclusive photoproduction of a $ \gamma
$-meson pair
|
6 pages, 3 figures. Presented by S. Nabeebaccus at DIS2022: XXIX
International Workshop on Deep-Inelastic Scattering and Related Subjects,
Santiago de Compostela, Spain, May 2-6 2022
| null | null | null |
hep-ph hep-ex nucl-ex nucl-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We consider the exclusive photo-production of a photon-meson pair with a
large invariant mass, working in the QCD factorisation framework. Explicitly,
we consider a $ \rho $-meson or a charged $ \pi $ in the final state. This
process gives access both to chiral-even GPDs and chiral-odd GPDs, which are
not well-known experimentally, especially the latter ones. The computation is
performed at leading order and leading twist. We discuss the prospects of
measuring them in experiments, focusing on the kinematics at the JLab 12-GeV
experiment, and pPb ultra-peripheral collisions at LHC. In particular, the
latter gives access to the small $ \xi $ regime of GPDs.
|
[
{
"created": "Mon, 12 Sep 2022 16:31:35 GMT",
"version": "v1"
},
{
"created": "Wed, 21 Sep 2022 10:42:34 GMT",
"version": "v2"
}
] |
2022-09-22
|
[
[
"Duplančić",
"Goran",
""
],
[
"Nabeebaccus",
"Saad",
""
],
[
"Passek-Kumerički",
"Kornelija",
""
],
[
"Pire",
"Bernard",
""
],
[
"Szymanowski",
"Lech",
""
],
[
"Wallon",
"Samuel",
""
]
] |
We consider the exclusive photo-production of a photon-meson pair with a large invariant mass, working in the QCD factorisation framework. Explicitly, we consider a $ \rho $-meson or a charged $ \pi $ in the final state. This process gives access both to chiral-even GPDs and chiral-odd GPDs, which are not well-known experimentally, especially the latter ones. The computation is performed at leading order and leading twist. We discuss the prospects of measuring them in experiments, focusing on the kinematics at the JLab 12-GeV experiment, and pPb ultra-peripheral collisions at LHC. In particular, the latter gives access to the small $ \xi $ regime of GPDs.
|
1105.2870
|
Chuan Hung Chen
|
Chuan-Hung Chen, Cheng-Wei Chiang, Takaaki Nomura, Yu Fusheng
|
A light charged Higgs boson in two-Higgs doublet model for CDF $Wjj$
anomaly
|
17 pages, 6 figures, typos corrected and new references added
| null |
10.1103/PhysRevD.85.075018
| null |
hep-ph hep-ex
|
http://creativecommons.org/licenses/by/3.0/
|
Motivated by recent anomalous CDF data on $Wjj$ events, we study a possible
explanation within the framework of the two-Higgs doublet model. We find that a
charged Higgs boson of mass $\sim$ 140 GeV with appropriate couplings can
account for the observed excess. In addition, we consider the flavor-changing
neutral current effects induced at loop level by the charged Higgs boson on the
$B$ meson system to further constrain the model. Our study shows that the
like-sign charge asymmetry $A_{s\ell}^b$ can be of ${\cal O}(10^{-3})$ in this
scenario.
|
[
{
"created": "Sat, 14 May 2011 07:45:33 GMT",
"version": "v1"
},
{
"created": "Tue, 17 May 2011 09:00:56 GMT",
"version": "v2"
},
{
"created": "Mon, 9 Jan 2012 09:21:09 GMT",
"version": "v3"
}
] |
2013-05-30
|
[
[
"Chen",
"Chuan-Hung",
""
],
[
"Chiang",
"Cheng-Wei",
""
],
[
"Nomura",
"Takaaki",
""
],
[
"Fusheng",
"Yu",
""
]
] |
Motivated by recent anomalous CDF data on $Wjj$ events, we study a possible explanation within the framework of the two-Higgs doublet model. We find that a charged Higgs boson of mass $\sim$ 140 GeV with appropriate couplings can account for the observed excess. In addition, we consider the flavor-changing neutral current effects induced at loop level by the charged Higgs boson on the $B$ meson system to further constrain the model. Our study shows that the like-sign charge asymmetry $A_{s\ell}^b$ can be of ${\cal O}(10^{-3})$ in this scenario.
|
1312.2821
|
Jinmian Li
|
Jun Guo, Zhaofeng Kang, Jinmian Li, Tianjun Li, Yandong Liu
|
Simplified Supersymmetry with Sneutrino LSP at 8 TeV LHC
|
26 pages, 8 figures,Minor corrections,References added
| null |
10.1007/JHEP10(2014)164
| null |
hep-ph hep-ex
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
The current searches of supersymmetry (SUSY) are based on the neutralino
lightest sparticle (LSP). In this article we instead focus on SUSY with
sneutrino LSP. It is well motivated in many contexts, especially in which
sneutrino services as a dark matter candidate. We first develop a simplified
model, which contains the stop, chagino/neutralino and sneutrino, to describe
the LHC phenomenologies of a large class of models with sneutrino LSP. Then we
investigate bounds on the model using the SUSY searches at the 8 TeV LHC.
Strong exclusion limits are derived, e.g., masses of stop and chargino can be
excluded up to about 900 GeV and 550 GeV, respectively. We also propose
optimizations for some searches without turning to higher energy and
luminosity.
|
[
{
"created": "Tue, 10 Dec 2013 14:55:20 GMT",
"version": "v1"
},
{
"created": "Sun, 15 Dec 2013 12:54:36 GMT",
"version": "v2"
}
] |
2015-06-18
|
[
[
"Guo",
"Jun",
""
],
[
"Kang",
"Zhaofeng",
""
],
[
"Li",
"Jinmian",
""
],
[
"Li",
"Tianjun",
""
],
[
"Liu",
"Yandong",
""
]
] |
The current searches of supersymmetry (SUSY) are based on the neutralino lightest sparticle (LSP). In this article we instead focus on SUSY with sneutrino LSP. It is well motivated in many contexts, especially in which sneutrino services as a dark matter candidate. We first develop a simplified model, which contains the stop, chagino/neutralino and sneutrino, to describe the LHC phenomenologies of a large class of models with sneutrino LSP. Then we investigate bounds on the model using the SUSY searches at the 8 TeV LHC. Strong exclusion limits are derived, e.g., masses of stop and chargino can be excluded up to about 900 GeV and 550 GeV, respectively. We also propose optimizations for some searches without turning to higher energy and luminosity.
|
hep-ph/9807343
|
Alexander S. Sakharov
|
M.Yu. Khlopov, R.V. Konoplich, S.G. Rubin, and A.S. Sakharov
|
Formation of Black Holes in First Order Phase Transitions
|
9 pages, Latex
| null | null |
Preprint 1203 (1998), I Roma University
|
hep-ph
| null |
A new mechanism of black hole formation in a first order phase transition is
proposed. In vacuum bubble collisions the interaction of bubble walls leads to
the formation of nontrivial vacuum configuration. The consequent collapse of
this vacuum configuration induces the black hole formation with high
probability. Observational constraints on the spectrum of primordial black
holes allow to obtain new nontrivial restrictions on parameters of inflation
models with first order phase transitions.
|
[
{
"created": "Sat, 11 Jul 1998 18:41:25 GMT",
"version": "v1"
}
] |
2007-05-23
|
[
[
"Khlopov",
"M. Yu.",
""
],
[
"Konoplich",
"R. V.",
""
],
[
"Rubin",
"S. G.",
""
],
[
"Sakharov",
"A. S.",
""
]
] |
A new mechanism of black hole formation in a first order phase transition is proposed. In vacuum bubble collisions the interaction of bubble walls leads to the formation of nontrivial vacuum configuration. The consequent collapse of this vacuum configuration induces the black hole formation with high probability. Observational constraints on the spectrum of primordial black holes allow to obtain new nontrivial restrictions on parameters of inflation models with first order phase transitions.
|
hep-ph/0306251
|
Patricia Ball
|
Patricia Ball
|
Weak Decay Form Factors from QCD Sum Rules on the Light-Cone
|
Invited talk at the Workshop on the CKM Unitarity Triangle, IPPP
Durham, April 2003 (eConf C0304052)
|
eConf C0304052 (2003) WG101
| null |
IPPP/03/39, DCPT/03/78
|
hep-ph
| null |
I present a compilation of results on B->light meson form factors from QCD
sum rules on the light-cone.
|
[
{
"created": "Wed, 25 Jun 2003 15:40:12 GMT",
"version": "v1"
}
] |
2007-05-23
|
[
[
"Ball",
"Patricia",
""
]
] |
I present a compilation of results on B->light meson form factors from QCD sum rules on the light-cone.
|
1901.06172
|
Alexander Manashov
|
V. M. Braun, A. N. Manashov, S. Moch and M. Strohmaier
|
Two-loop evolution equations for flavor-singlet light-ray operators
|
27 pages, 4 figures
| null |
10.1007/JHEP02(2019)191
|
DESY 18-202
|
hep-ph hep-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
QCD in non-integer $d=4-2\epsilon$ space-time dimensions enjoys conformal
invariance at the special fine-tuned value of the coupling. Counterterms for
composite operators in minimal subtraction schemes do not depend on $\epsilon$
by construction, and therefore the renormalization group equations for
composite operators in physical (integer) dimensions inherit conformal
symmetry. This observation can be used to restore the complete evolution
kernels that take into account mixing with the operators containing total
derivatives from their eigenvalues (anomalous dimensions). Using this approach
we calculate the two-loop (NLO) evolution kernels for the leading twist
flavor-singlet operators in the position space (light-ray operator)
representation. As the main result of phenomenological relevance, in this way
we are able to confirm the evolution equations of flavor-singlet generalized
hadron parton distributions derived earlier by Belitsky and M\"uller using a
different approach.
|
[
{
"created": "Fri, 18 Jan 2019 10:37:19 GMT",
"version": "v1"
}
] |
2019-03-27
|
[
[
"Braun",
"V. M.",
""
],
[
"Manashov",
"A. N.",
""
],
[
"Moch",
"S.",
""
],
[
"Strohmaier",
"M.",
""
]
] |
QCD in non-integer $d=4-2\epsilon$ space-time dimensions enjoys conformal invariance at the special fine-tuned value of the coupling. Counterterms for composite operators in minimal subtraction schemes do not depend on $\epsilon$ by construction, and therefore the renormalization group equations for composite operators in physical (integer) dimensions inherit conformal symmetry. This observation can be used to restore the complete evolution kernels that take into account mixing with the operators containing total derivatives from their eigenvalues (anomalous dimensions). Using this approach we calculate the two-loop (NLO) evolution kernels for the leading twist flavor-singlet operators in the position space (light-ray operator) representation. As the main result of phenomenological relevance, in this way we are able to confirm the evolution equations of flavor-singlet generalized hadron parton distributions derived earlier by Belitsky and M\"uller using a different approach.
|
2005.04195
|
Samuel Abreu
|
S. Abreu, H. Ita, F. Moriello, B. Page, W. Tschernow, M. Zeng
|
Two-Loop Integrals for Planar Five-Point One-Mass Processes
|
v2: minor typos corrected
| null |
10.1007/JHEP11(2020)117
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We present the computation of a full set of planar five-point two-loop master
integrals with one external mass. These integrals are an important ingredient
for two-loop scattering amplitudes for two-jet-associated W-boson production at
leading color in QCD. We provide a set of pure integrals together with
differential equations in canonical form. We obtain analytic differential
equations efficiently from numerical samples over finite fields, fitting an
ansatz built from symbol letters. The symbol alphabet itself is constructed
from cut differential equations and we find that it can be written in a
remarkably compact form. We comment on the analytic properties of the integrals
and confirm the extended Steinmann relations, which govern the double
discontinuities of Feynman integrals, to all orders in $\epsilon$. We solve the
differential equations in terms of generalized power series on single-parameter
contours in the space of Mandelstam invariants. This form of the solution
trivializes the analytic continuation and the integrals can be evaluated in all
kinematic regions with arbitrary numerical precision.
|
[
{
"created": "Fri, 8 May 2020 17:33:43 GMT",
"version": "v1"
},
{
"created": "Wed, 27 May 2020 14:38:05 GMT",
"version": "v2"
}
] |
2020-12-30
|
[
[
"Abreu",
"S.",
""
],
[
"Ita",
"H.",
""
],
[
"Moriello",
"F.",
""
],
[
"Page",
"B.",
""
],
[
"Tschernow",
"W.",
""
],
[
"Zeng",
"M.",
""
]
] |
We present the computation of a full set of planar five-point two-loop master integrals with one external mass. These integrals are an important ingredient for two-loop scattering amplitudes for two-jet-associated W-boson production at leading color in QCD. We provide a set of pure integrals together with differential equations in canonical form. We obtain analytic differential equations efficiently from numerical samples over finite fields, fitting an ansatz built from symbol letters. The symbol alphabet itself is constructed from cut differential equations and we find that it can be written in a remarkably compact form. We comment on the analytic properties of the integrals and confirm the extended Steinmann relations, which govern the double discontinuities of Feynman integrals, to all orders in $\epsilon$. We solve the differential equations in terms of generalized power series on single-parameter contours in the space of Mandelstam invariants. This form of the solution trivializes the analytic continuation and the integrals can be evaluated in all kinematic regions with arbitrary numerical precision.
|
hep-ph/0111230
|
Thomas G. Rizzo
|
Thomas G. Rizzo
|
Black Hole Production Rates at the LHC: Still Large
|
typo removed; contributed to Snowmass 2001
|
eConf C010630 (2001) P339
| null |
SLAC-PUB-9053
|
hep-ph
| null |
We examine the rates for the production of black holes(BH) at the LHC in
light of the exponential suppression of the geometric cross section estimate
proposed by Voloshin. We show that these rates will still be quite large over a
reasonable range of model parameters. While BH production may not be the
dominant process, its unique signature will ensure observability over
conventional backgrounds.
|
[
{
"created": "Mon, 19 Nov 2001 19:09:51 GMT",
"version": "v1"
},
{
"created": "Tue, 11 Dec 2001 19:14:31 GMT",
"version": "v2"
}
] |
2007-05-23
|
[
[
"Rizzo",
"Thomas G.",
""
]
] |
We examine the rates for the production of black holes(BH) at the LHC in light of the exponential suppression of the geometric cross section estimate proposed by Voloshin. We show that these rates will still be quite large over a reasonable range of model parameters. While BH production may not be the dominant process, its unique signature will ensure observability over conventional backgrounds.
|
hep-ph/0609028
|
Yannis Burnier
|
Yannis Burnier
|
Anomalous fermion number nonconservation: Paradoxes in the level
crossing picture
|
26 pages, 6 figures
|
Phys.Rev.D74:105013,2006
|
10.1103/PhysRevD.74.105013
| null |
hep-ph hep-th
| null |
In theories with anomalous fermion number nonconservation, the level crossing
picture is considered a faithful representation of the fermionic quantum number
variation. It represents each created fermion by an energy level that crosses
the zero-energy line from below. If several fermions of various masses are
created, the level crossing picture contains several levels that cross the
zero-energy line and cross each other. However, we know from quantum mechanics
that the corresponding levels cannot cross if the different fermions are mixed
via some interaction potential. The simultaneous application of these two
requirements on the level behavior leads to paradoxes. For instance, a naive
interpretation of the resulting level crossing picture gives rise to charge
nonconservation. In this paper, we resolve this paradox by a precise
calculation of the transition probability, and discuss what are the
implications for the electroweak theory. In particular, the nonperturbative
transition probability is higher if top quarks are present in the initial
state.
|
[
{
"created": "Mon, 4 Sep 2006 15:03:50 GMT",
"version": "v1"
}
] |
2008-11-26
|
[
[
"Burnier",
"Yannis",
""
]
] |
In theories with anomalous fermion number nonconservation, the level crossing picture is considered a faithful representation of the fermionic quantum number variation. It represents each created fermion by an energy level that crosses the zero-energy line from below. If several fermions of various masses are created, the level crossing picture contains several levels that cross the zero-energy line and cross each other. However, we know from quantum mechanics that the corresponding levels cannot cross if the different fermions are mixed via some interaction potential. The simultaneous application of these two requirements on the level behavior leads to paradoxes. For instance, a naive interpretation of the resulting level crossing picture gives rise to charge nonconservation. In this paper, we resolve this paradox by a precise calculation of the transition probability, and discuss what are the implications for the electroweak theory. In particular, the nonperturbative transition probability is higher if top quarks are present in the initial state.
|
hep-ph/0109114
|
Fischer
|
C.S. Fischer
|
Parametrizations of Quark Confinement in Production Processes
|
2 pages, 2 figures, talk given at the workshop {\it The Spin
Structure of the Proton}, Trento, July 23rd to 28th, 2001
|
Nucl.Phys.Proc.Suppl. 105 (2002) 130-131
|
10.1016/S0920-5632(01)01966-1
|
UNITU-THEP-22/01
|
hep-ph
| null |
Baryons are described as bound states of quarks and scalar as well as
axialvector diquarks. In order to effectively parametrize confinement several
{\it ansaetze} for the dressing functions of the constituent propagators are
used. The corresponding results for electromagnetic and strong form factors
differ only slightly. On the other hand observables from production processes
show the permissibility of different dressing functions.
|
[
{
"created": "Thu, 13 Sep 2001 15:05:49 GMT",
"version": "v1"
}
] |
2009-11-07
|
[
[
"Fischer",
"C. S.",
""
]
] |
Baryons are described as bound states of quarks and scalar as well as axialvector diquarks. In order to effectively parametrize confinement several {\it ansaetze} for the dressing functions of the constituent propagators are used. The corresponding results for electromagnetic and strong form factors differ only slightly. On the other hand observables from production processes show the permissibility of different dressing functions.
|
hep-ph/9504210
| null |
A. Djouadi, J. Ng and T.G. Rizzo, et al
|
NEW PARTICLES AND INTERACTIONS
|
64 pages, latex, 30 figures (not included). The full *.ps file
including the figures can be obtained via anonymous ftp at
ftp://lpsvsh.lps.umontreal.ca/hep_th/dpf.ps . To appear as a chapter in
"Electroweak Symmetry Breaking and Beyond the Standard Model", edited by T.
Barklow, S. Dawson, H.E. Haber and S. Siegrist, World Scientific
| null |
10.1142/9789812830265_0008
|
SLAC-PUB-95-6772, GPP-UdeM-TH-95-17, TRI-PP-95-05
|
hep-ph
| null |
We analyze the manifestations of new matter particles predicted by models of
new physics beyond the Standard Model, at present and future high--energy
colliders. We consider both the production of these new particles and some of
their indirect signatures at $pp$ and $eP$ colliders as well as TeV $\ee$
colliders with their $\ee, e \gamma, \gamma \gamma$ and $e^- e^-$ modes. The
report is arranged into four main sections plus an overview. These sections
will deal separately with exotic and excited fermions, difermions, and new
interactions.
|
[
{
"created": "Mon, 3 Apr 1995 21:18:00 GMT",
"version": "v1"
}
] |
2016-11-03
|
[
[
"Djouadi",
"A.",
""
],
[
"Ng",
"J.",
""
],
[
"Rizzo",
"T. G.",
""
]
] |
We analyze the manifestations of new matter particles predicted by models of new physics beyond the Standard Model, at present and future high--energy colliders. We consider both the production of these new particles and some of their indirect signatures at $pp$ and $eP$ colliders as well as TeV $\ee$ colliders with their $\ee, e \gamma, \gamma \gamma$ and $e^- e^-$ modes. The report is arranged into four main sections plus an overview. These sections will deal separately with exotic and excited fermions, difermions, and new interactions.
|
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