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|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
2302.02905
|
Amit Tiwari
|
Qaisar Shafi, Amit Tiwari and Cem Salih Un
|
Third family quasi-Yukawa unification: Higgsino dark matter, NLSP gluino
and all that
|
The revised draft includes Higgsino dark matter solutions and other
improvements. Neutralino mixing and RGE evolutions of Yukawa couplings are
corrected
| null | null | null |
hep-ph
|
http://creativecommons.org/licenses/by/4.0/
|
We explore the implications of third family ($t-b-\tau$) quasi-Yukawa
unification (QYU) for collider and dark matter (DM) searches within the
framework of a supersymmetric $SU(4)_c \times SU(2)_L \times SU(2)_R$ model.
The deviation from exact Yukawa unification is quantified through the relation
$y_t : y_b : y_\tau = |1+C|:|1-C|:|1+3C|$, with $C$ being a real parameter
($|C| \leq 0.2$). We allow for the breaking of left-right symmetry both by the
soft scalar and gaugino mass parameters and obtain a variety of viable
solutions that predict the sparticle mass spectrum including LSP DM (whose
stability is guaranteed by a $Z_2$ gauge symmetry). We highlight solutions that
include an NLSP gluino with mass $\sim$ 1.3-2.5 TeV, which should be accessible
at LHC Run 3. There also exist NSLP stop solutions with masses heavier than
about 1.8 TeV, which are consistent with the LSP neutralino dark matter relic
density through stop-neutralino coannihilation. We identify A-resonance
solutions with DM mass $\sim$ 0.8 - 2 TeV, as well as bino-chargino,
bino-slepton and bino-stau co-annihilation scenarios. Finally, we also identify
Wino-like ($\sim99\%$) and Higgsino-like ($\sim99\%$) solutions whose masses
are heavier than about 1.5 TeV and 1 TeV, respectively. These solutions are
compatible with the desired dark matter relic density and testable in ongoing
and future direct detection experiments.
|
[
{
"created": "Mon, 6 Feb 2023 16:21:23 GMT",
"version": "v1"
},
{
"created": "Fri, 17 Mar 2023 00:32:41 GMT",
"version": "v2"
}
] |
2023-03-20
|
[
[
"Shafi",
"Qaisar",
""
],
[
"Tiwari",
"Amit",
""
],
[
"Un",
"Cem Salih",
""
]
] |
We explore the implications of third family ($t-b-\tau$) quasi-Yukawa unification (QYU) for collider and dark matter (DM) searches within the framework of a supersymmetric $SU(4)_c \times SU(2)_L \times SU(2)_R$ model. The deviation from exact Yukawa unification is quantified through the relation $y_t : y_b : y_\tau = |1+C|:|1-C|:|1+3C|$, with $C$ being a real parameter ($|C| \leq 0.2$). We allow for the breaking of left-right symmetry both by the soft scalar and gaugino mass parameters and obtain a variety of viable solutions that predict the sparticle mass spectrum including LSP DM (whose stability is guaranteed by a $Z_2$ gauge symmetry). We highlight solutions that include an NLSP gluino with mass $\sim$ 1.3-2.5 TeV, which should be accessible at LHC Run 3. There also exist NSLP stop solutions with masses heavier than about 1.8 TeV, which are consistent with the LSP neutralino dark matter relic density through stop-neutralino coannihilation. We identify A-resonance solutions with DM mass $\sim$ 0.8 - 2 TeV, as well as bino-chargino, bino-slepton and bino-stau co-annihilation scenarios. Finally, we also identify Wino-like ($\sim99\%$) and Higgsino-like ($\sim99\%$) solutions whose masses are heavier than about 1.5 TeV and 1 TeV, respectively. These solutions are compatible with the desired dark matter relic density and testable in ongoing and future direct detection experiments.
|
1112.5339
|
Henrik Melbeus
|
Mattias Blennow, Henrik Melbeus, Tommy Ohlsson, He Zhang
|
RG running in a minimal UED model in light of recent LHC Higgs mass
bounds
|
16 pages, 6 figures, RevTeX4. Final version published in Phys. Lett.
B
|
Phys. Lett. B 712 (2012) 419-424
|
10.1016/j.physletb.2012.05.029
| null |
hep-ph hep-ex
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We study how the recent ATLAS and CMS Higgs mass bounds affect the
renormalization group running of the physical parameters in universal extra
dimensions. Using the running of the Higgs self-coupling constant, we derive
bounds on the cutoff scale of the extra-dimensional theory itself. We show that
the running of physical parameters, such as the fermion masses and the CKM
mixing matrix, is significantly restricted by these bounds. In particular, we
find that the running of the gauge couplings cannot be sufficient to allow
gauge unification at the cutoff scale.
|
[
{
"created": "Thu, 22 Dec 2011 14:57:22 GMT",
"version": "v1"
},
{
"created": "Tue, 29 May 2012 11:43:55 GMT",
"version": "v2"
}
] |
2015-06-03
|
[
[
"Blennow",
"Mattias",
""
],
[
"Melbeus",
"Henrik",
""
],
[
"Ohlsson",
"Tommy",
""
],
[
"Zhang",
"He",
""
]
] |
We study how the recent ATLAS and CMS Higgs mass bounds affect the renormalization group running of the physical parameters in universal extra dimensions. Using the running of the Higgs self-coupling constant, we derive bounds on the cutoff scale of the extra-dimensional theory itself. We show that the running of physical parameters, such as the fermion masses and the CKM mixing matrix, is significantly restricted by these bounds. In particular, we find that the running of the gauge couplings cannot be sufficient to allow gauge unification at the cutoff scale.
|
0812.2051
|
Linda Carpenter
|
Linda M. Carpenter
|
Surveying the Phenomenology of General Gauge Mediation
|
21 pages, 3 figures
| null | null |
SCIPP 08/13
|
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
I explore the phenomenology, constraints and tuning for several weakly
coupled implementations of multi-parameter gauge mediation and compare to
minimal gauge mediation. The low energy spectra are distinct from that of
minimal gauge mediation, a wide range of NLSPs is found and spectra are
significantly compressed thus tunings may be generically reduced to a part in
10 to a part in 20.
|
[
{
"created": "Thu, 11 Dec 2008 11:49:08 GMT",
"version": "v1"
}
] |
2008-12-12
|
[
[
"Carpenter",
"Linda M.",
""
]
] |
I explore the phenomenology, constraints and tuning for several weakly coupled implementations of multi-parameter gauge mediation and compare to minimal gauge mediation. The low energy spectra are distinct from that of minimal gauge mediation, a wide range of NLSPs is found and spectra are significantly compressed thus tunings may be generically reduced to a part in 10 to a part in 20.
|
hep-ph/0409102
|
Atsushi Hosaka
|
A. Hosaka, M. Oka and T. Shinozaki
|
Decay of Theta+ in a quark model
|
14 pages, to appear in Phys. Rev. D
|
Phys.Rev. D71 (2005) 074021
|
10.1103/PhysRevD.71.074021
|
RCNP-Th04028
|
hep-ph
| null |
We study the decay of Theta+ in a non-relativistic quark model. The wave
function of Theta+ is constructed for the two cases JP = 1/2+- as products of
color, spin, flavor and orbital parts respecting total antisymmetrization among
the four quarks. We find that for the negative parity Theta+ the width becomes
very large which is of order of several hundreds MeV, while it is about a
several tens MeV for the positive parity. By assuming additionally diquark
correlations, the width is reduced to be of order 10 MeV. It is also pointed
out that a similar calculation for 3/2- results in strong suppression of its
width.
|
[
{
"created": "Thu, 9 Sep 2004 03:21:54 GMT",
"version": "v1"
},
{
"created": "Sat, 9 Apr 2005 12:32:51 GMT",
"version": "v2"
}
] |
2009-11-10
|
[
[
"Hosaka",
"A.",
""
],
[
"Oka",
"M.",
""
],
[
"Shinozaki",
"T.",
""
]
] |
We study the decay of Theta+ in a non-relativistic quark model. The wave function of Theta+ is constructed for the two cases JP = 1/2+- as products of color, spin, flavor and orbital parts respecting total antisymmetrization among the four quarks. We find that for the negative parity Theta+ the width becomes very large which is of order of several hundreds MeV, while it is about a several tens MeV for the positive parity. By assuming additionally diquark correlations, the width is reduced to be of order 10 MeV. It is also pointed out that a similar calculation for 3/2- results in strong suppression of its width.
|
0806.0889
|
Wei Chao
|
Wei Chao
|
The Muon Magnetic Moment in the TeV Scale Seesaw Models
|
12 pages, 3 figures
| null | null | null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
The reported discrepancy of the muon abnormal magnetic moment $a_\mu^{}$ has
impacts on the low energy phenomenology. In this paper we calculate the
corrections to $a_\mu$ in the standard model extended by the TeV scale seesaw
models. We show that the correction induced by the type-I seesaw model is
negative and of the order ${\cal O} (10^{-11})$, which can be neglected
compared with $a_\mu^{\rm SM}$. The correction induced by the type-II seesaw
model, which depends on the mass of the Higgs triplet $m_\Delta$ and the Yukawa
coupling $Y_\Delta$, can be of the order ${\cal O}(10^{-10})$ and compensate
for the discrepancy between $a_\mu^{\rm SM}$ and $a_{\mu}^{\rm exp}$. The
correction induced by the type-III seesaw model is also negative and can be of
the order ${\cal O}(10^{-10})$.
|
[
{
"created": "Thu, 5 Jun 2008 02:48:28 GMT",
"version": "v1"
}
] |
2008-06-06
|
[
[
"Chao",
"Wei",
""
]
] |
The reported discrepancy of the muon abnormal magnetic moment $a_\mu^{}$ has impacts on the low energy phenomenology. In this paper we calculate the corrections to $a_\mu$ in the standard model extended by the TeV scale seesaw models. We show that the correction induced by the type-I seesaw model is negative and of the order ${\cal O} (10^{-11})$, which can be neglected compared with $a_\mu^{\rm SM}$. The correction induced by the type-II seesaw model, which depends on the mass of the Higgs triplet $m_\Delta$ and the Yukawa coupling $Y_\Delta$, can be of the order ${\cal O}(10^{-10})$ and compensate for the discrepancy between $a_\mu^{\rm SM}$ and $a_{\mu}^{\rm exp}$. The correction induced by the type-III seesaw model is also negative and can be of the order ${\cal O}(10^{-10})$.
|
hep-ph/0412054
|
Keith Olive
|
Keith A. Olive
|
Dark Matter Candidates in Supersymmetric Models
|
22 pages, 23 eps figures, Summary of talk at "Dark 2004", proceedings
of 5th International Heidelberg Conference on Dark Matter in Astro and
Particle Physics
| null | null |
UMN-TH-2332/04, FTPI-MINN-04/45
|
hep-ph
| null |
The status of the constrained minimal supersymmetric standard model (CMSSM)
will be discussed in light of our current understanding of the relic density
after WMAP. A global likelihood analysis of the model is performed including
data from direct Higgs searches, global fits to electroweak data, b to s gamma,
the anomalous magnetic moment of the muon, as well as the cosmological relic
density. Also considered are models which relax and further constrain the
CMSSM. Prospects for dark matter detection in colliders and cryogenic detectors
will be briefly discussed.
|
[
{
"created": "Fri, 3 Dec 2004 18:12:45 GMT",
"version": "v1"
}
] |
2007-05-23
|
[
[
"Olive",
"Keith A.",
""
]
] |
The status of the constrained minimal supersymmetric standard model (CMSSM) will be discussed in light of our current understanding of the relic density after WMAP. A global likelihood analysis of the model is performed including data from direct Higgs searches, global fits to electroweak data, b to s gamma, the anomalous magnetic moment of the muon, as well as the cosmological relic density. Also considered are models which relax and further constrain the CMSSM. Prospects for dark matter detection in colliders and cryogenic detectors will be briefly discussed.
|
hep-ph/9208229
|
Ernest Ma
|
T. V. Duong and Ernest Ma
|
Decay of the Z Boson into Scalar Particles
|
11 pages (2 figures, not included) (Revised, Oct 1992). Some
equations have been corrected and 1 figure has been eliminated
|
Phys.Rev. D47 (1993) 2020-2024
|
10.1103/PhysRevD.47.2020
|
UCRHEP-T96
|
hep-ph
| null |
In extensions of the standard model, light scalar particles are often
possible because of symmetry considerations. We study the decay of the Z boson
into such particles. In particular, we consider for illustration the scalar
sector of a recently proposed model of the 17-keV neutrino which satisfies all
laboratory, astrophysical, and cosmological constraints.
|
[
{
"created": "Mon, 17 Aug 1992 18:50:46 GMT",
"version": "v1"
},
{
"created": "Thu, 8 Oct 1992 15:53:37 GMT",
"version": "v2"
}
] |
2009-10-22
|
[
[
"Duong",
"T. V.",
""
],
[
"Ma",
"Ernest",
""
]
] |
In extensions of the standard model, light scalar particles are often possible because of symmetry considerations. We study the decay of the Z boson into such particles. In particular, we consider for illustration the scalar sector of a recently proposed model of the 17-keV neutrino which satisfies all laboratory, astrophysical, and cosmological constraints.
|
hep-ph/0506198
|
Bibhuti Bhusan Deo
|
B. B. Deo, P. K. Mishra
|
Calculation of the Masses and the Running Masses of the Quarks and
Leptons from Electroweak to Supersymmetric Grand Unification Mass
|
18 pages, 5 figures
| null | null | null |
hep-ph
| null |
We make a systematic theoretical analysis of the masses and their variation
with energy by solving the renormalization group equation (RGE) in the Minimal
Supersymmetric Standard Model (MSSM). The unification fermion masses of around
115 GeV at GeV scale has been derived by Deo and Maharana. Here we undertake
the unfinished but the important task of calculating the masses and their
running. The unification mass and group theoretic constants for the model are
known. The top mass and its descent is studied very carefully. We find that the
Ramond,Roberts and Ross value of the Wolfenstein parameter is nearly equal to
0.22. When raised to integral powers, the whole mass spectra of the remaining
eleven fermions are obtained. We deduce formulas and plot them for all the 12
fermions as they vary from $t=log \frac{\mu}{M_z}=0$ to $t_X=33$; the GUT mass
being $M_X=2.2\times 10^{16}$ GeV.
|
[
{
"created": "Mon, 20 Jun 2005 20:11:04 GMT",
"version": "v1"
},
{
"created": "Sun, 26 Jun 2005 06:57:11 GMT",
"version": "v2"
},
{
"created": "Mon, 8 Aug 2005 08:40:53 GMT",
"version": "v3"
},
{
"created": "Thu, 19 Jan 2006 07:05:33 GMT",
"version": "v4"
}
] |
2007-05-23
|
[
[
"Deo",
"B. B.",
""
],
[
"Mishra",
"P. K.",
""
]
] |
We make a systematic theoretical analysis of the masses and their variation with energy by solving the renormalization group equation (RGE) in the Minimal Supersymmetric Standard Model (MSSM). The unification fermion masses of around 115 GeV at GeV scale has been derived by Deo and Maharana. Here we undertake the unfinished but the important task of calculating the masses and their running. The unification mass and group theoretic constants for the model are known. The top mass and its descent is studied very carefully. We find that the Ramond,Roberts and Ross value of the Wolfenstein parameter is nearly equal to 0.22. When raised to integral powers, the whole mass spectra of the remaining eleven fermions are obtained. We deduce formulas and plot them for all the 12 fermions as they vary from $t=log \frac{\mu}{M_z}=0$ to $t_X=33$; the GUT mass being $M_X=2.2\times 10^{16}$ GeV.
|
hep-ph/0508207
|
Jitesh Bhatt
|
Jitesh Bhatt and Raghavan Rangarajan
|
Thermalisation in Thick Wall Electroweak Baryogenesis
|
Final version published Physical Review D75, 087305, 2007 Significant
changes from the previous version. (4pages no figures)
|
Phys.Rev.D75:087305,2007
|
10.1103/PhysRevD.75.087305
| null |
hep-ph
| null |
In models of thick wall electroweak baryogenesis a common assumption is that
the plasma interacting with the expanding Higgs bubble wall during the
electroweak phase transition is in kinetic equilibrium (or close to it). We
point out that, in addition to the requirement of low wall velocity, kinetic
equilibrium requires that the change in the momentum of the particles due to
the force exerted by the wall should be much less than that due to scattering
as the plasma passes through the wall. We investigate whether this condition is
satisfied for charginos and neutralinos participating in thick wall
supersymmetric electroweak baryogenesis
|
[
{
"created": "Fri, 19 Aug 2005 06:29:15 GMT",
"version": "v1"
},
{
"created": "Mon, 4 Jun 2007 11:01:40 GMT",
"version": "v2"
}
] |
2008-11-26
|
[
[
"Bhatt",
"Jitesh",
""
],
[
"Rangarajan",
"Raghavan",
""
]
] |
In models of thick wall electroweak baryogenesis a common assumption is that the plasma interacting with the expanding Higgs bubble wall during the electroweak phase transition is in kinetic equilibrium (or close to it). We point out that, in addition to the requirement of low wall velocity, kinetic equilibrium requires that the change in the momentum of the particles due to the force exerted by the wall should be much less than that due to scattering as the plasma passes through the wall. We investigate whether this condition is satisfied for charginos and neutralinos participating in thick wall supersymmetric electroweak baryogenesis
|
1407.8332
|
Marek Tasevsky
|
Marek Tasevsky
|
Review of Central Exclusive Production of the Higgs Boson Beyond the
Standard Model
|
19 pages, 3 figures; to appear as review article in Int J Mod Phys A
| null |
10.1142/S0217751X14460129
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We review activities in the field of theoretical, phenomenological and
experimental studies related to the production of the Higgs boson in central
exclusive processes at LHC in models beyond Standard Model. Prospects in the
context of the Higgs boson discovery at LHC in 2012 and of proposals to build
forward proton detectors at ATLAS and CMS side are summarized.
|
[
{
"created": "Thu, 31 Jul 2014 09:49:00 GMT",
"version": "v1"
}
] |
2015-06-22
|
[
[
"Tasevsky",
"Marek",
""
]
] |
We review activities in the field of theoretical, phenomenological and experimental studies related to the production of the Higgs boson in central exclusive processes at LHC in models beyond Standard Model. Prospects in the context of the Higgs boson discovery at LHC in 2012 and of proposals to build forward proton detectors at ATLAS and CMS side are summarized.
|
hep-ph/9808399
|
Zhen Cao
|
Zhen Cao and Rudolph C. Hwa
|
A Color Mutation Model of Soft Interaction in High Energy Hadronic
Collisions
|
24 pages including 11 figures in revtex epsf style
|
Phys.Rev. D59 (1999) 114023
|
10.1103/PhysRevD.59.114023
|
OITS-645
|
hep-ph nucl-th
| null |
A comprehensive model, called ECOMB, is proposed to describe multiparticle
production by soft interaction. It incorporates the eikonal formalism, parton
model, color mutation, branching and recombination. The physics is conceptually
opposite to the dynamics that underlies the fragmentation of a string. The
partons are present initially in a hadronic collision; they form a single,
large, color-neutral cluster until color mutation of the quarks leads to a
fission of the cluster into two color-neutral subclusters. The mutation and
branching processes continue until only $q\bar q$ pairs are left in each small
cluster. The model contains self-similar dynamics and exhibits scaling behavior
in the factorial moments. It can satisfactorily reproduce the intermittency
data that no other model has been able to fit.
|
[
{
"created": "Mon, 24 Aug 1998 16:50:12 GMT",
"version": "v1"
}
] |
2009-10-31
|
[
[
"Cao",
"Zhen",
""
],
[
"Hwa",
"Rudolph C.",
""
]
] |
A comprehensive model, called ECOMB, is proposed to describe multiparticle production by soft interaction. It incorporates the eikonal formalism, parton model, color mutation, branching and recombination. The physics is conceptually opposite to the dynamics that underlies the fragmentation of a string. The partons are present initially in a hadronic collision; they form a single, large, color-neutral cluster until color mutation of the quarks leads to a fission of the cluster into two color-neutral subclusters. The mutation and branching processes continue until only $q\bar q$ pairs are left in each small cluster. The model contains self-similar dynamics and exhibits scaling behavior in the factorial moments. It can satisfactorily reproduce the intermittency data that no other model has been able to fit.
|
hep-ph/9703271
|
Leonid Burakovsky
|
L. Burakovsky and T. Goldman
|
Towards resolution of the enigmas of P-wave meson spectroscopy
|
22 pages, LaTeX
|
Phys.Rev.D57:2879-2888,1998
|
10.1103/PhysRevD.57.2879
|
LA-UR-97-717
|
hep-ph
| null |
The mass spectrum of P-wave mesons is considered in a nonrelativistic
constituent quark model. The results show the common mass degeneracy of the
isovector and isodoublet states of the scalar and tensor meson nonets, and do
not exclude the possibility of a similar degeneracy of the same states of the
axial-vector and pseudovector nonets. Current experimental hadronic and \tau
-decay data suggest, however, a different scenario leading to the a_1 meson
mass \simeq 1190 MeV and the K_{1A}-K_{1B} mixing angle \simeq (37\pm 3)^o.
Possible s\bar{s} states of the four nonets are also discussed.
|
[
{
"created": "Sat, 8 Mar 1997 00:03:23 GMT",
"version": "v1"
},
{
"created": "Wed, 7 May 1997 18:51:58 GMT",
"version": "v2"
}
] |
2008-11-26
|
[
[
"Burakovsky",
"L.",
""
],
[
"Goldman",
"T.",
""
]
] |
The mass spectrum of P-wave mesons is considered in a nonrelativistic constituent quark model. The results show the common mass degeneracy of the isovector and isodoublet states of the scalar and tensor meson nonets, and do not exclude the possibility of a similar degeneracy of the same states of the axial-vector and pseudovector nonets. Current experimental hadronic and \tau -decay data suggest, however, a different scenario leading to the a_1 meson mass \simeq 1190 MeV and the K_{1A}-K_{1B} mixing angle \simeq (37\pm 3)^o. Possible s\bar{s} states of the four nonets are also discussed.
|
hep-ph/9606250
|
Ephraim Fischbach
|
Ephraim Fischbach
|
A Lower Bound on Neutrino Mass
|
4 pages; Moriond Proceedings
| null | null | null |
hep-ph
| null |
The exchange of massless neutrinos between heavy fermions (e.g. $e,p,n$)
gives rise to a long-range 2-body force. It is shown that the analogous
many-body force can lead to an unphysically large energy density in white
dwarfs and neutron stars. To reduce the energy density to a physically
acceptable value, the neutrino must have a {\it minimum mass}, which is
approximately $0.4\;eV/c^2$. Some recent questions relating to the derivation
of this bound are also discussed.
|
[
{
"created": "Wed, 5 Jun 1996 19:20:53 GMT",
"version": "v1"
}
] |
2007-05-23
|
[
[
"Fischbach",
"Ephraim",
""
]
] |
The exchange of massless neutrinos between heavy fermions (e.g. $e,p,n$) gives rise to a long-range 2-body force. It is shown that the analogous many-body force can lead to an unphysically large energy density in white dwarfs and neutron stars. To reduce the energy density to a physically acceptable value, the neutrino must have a {\it minimum mass}, which is approximately $0.4\;eV/c^2$. Some recent questions relating to the derivation of this bound are also discussed.
|
hep-ph/9910218
|
Silvano Simula
|
F. Cardarelli and S. Simula
|
Analysis of the exclusive semileptonic decay Lambda_b -> Lambda_c + l
nu_l within a light-front constituent quark model
|
in Proceedings of the International Conference PANIC '99, Uppsala
(Sweden), June 1999
|
Nucl.Phys. A663 (2000) 931-934
|
10.1016/S0375-9474(99)00800-3
|
preprint RM3-TH/99-10
|
hep-ph
| null |
The exclusive semileptonic decay Lambda_b -> Lambda_c + l nu_l is
investigated including both radiative and first-order power corrections in the
inverse heavy-quark mass, while the Isgur-Wise function is calculated within a
light-front constituent quark model. It turns out that the dependence on the
model parameters can be effectively constrained using recent lattice QCD
results at low values of the recoil. Our final predictions for the exclusive
semileptonic branching ratio, the longitudinal and transverse asymmetries, and
the longitudinal to transverse decay ratio are: Br(Lambda_b -> Lambda_c + l
nu_l) = (6.3 \pm 1.6) % |V_{bc} / 0.040|**2 \tau(\Lambda_b) / (1.24 ps), a_L =
-0.945 \pm 0.014, a_T = -0.62 \pm 0.09 and R_L/T = 1.57 \pm 0.15, respectively.
Moreover, the theoretical uncertainties both on a_L and the (partially
integrated) R_L/T are found to be quite small and, therefore, the experimental
determination of these quantities is a very interesting tool for testing the
Standard Model and for investigating possible New Physics. In this respect the
sensitivity to extract unique information both on the strength and phase of
possible hadronic right-handed currents is illustrated.
|
[
{
"created": "Mon, 4 Oct 1999 10:36:04 GMT",
"version": "v1"
}
] |
2009-10-31
|
[
[
"Cardarelli",
"F.",
""
],
[
"Simula",
"S.",
""
]
] |
The exclusive semileptonic decay Lambda_b -> Lambda_c + l nu_l is investigated including both radiative and first-order power corrections in the inverse heavy-quark mass, while the Isgur-Wise function is calculated within a light-front constituent quark model. It turns out that the dependence on the model parameters can be effectively constrained using recent lattice QCD results at low values of the recoil. Our final predictions for the exclusive semileptonic branching ratio, the longitudinal and transverse asymmetries, and the longitudinal to transverse decay ratio are: Br(Lambda_b -> Lambda_c + l nu_l) = (6.3 \pm 1.6) % |V_{bc} / 0.040|**2 \tau(\Lambda_b) / (1.24 ps), a_L = -0.945 \pm 0.014, a_T = -0.62 \pm 0.09 and R_L/T = 1.57 \pm 0.15, respectively. Moreover, the theoretical uncertainties both on a_L and the (partially integrated) R_L/T are found to be quite small and, therefore, the experimental determination of these quantities is a very interesting tool for testing the Standard Model and for investigating possible New Physics. In this respect the sensitivity to extract unique information both on the strength and phase of possible hadronic right-handed currents is illustrated.
|
2109.10414
|
Anja Butter
|
Anja Butter, Tilman Plehn, Nathalie Soybelman, and Johann Brehmer
|
Back to the Formula -- LHC Edition
| null |
SciPost Phys. 16, 037 (2024)
|
10.21468/SciPostPhys.16.1.037
| null |
hep-ph
|
http://creativecommons.org/licenses/by/4.0/
|
While neural networks offer an attractive way to numerically encode
functions, actual formulas remain the language of theoretical particle physics.
We show how symbolic regression trained on matrix-element information provides,
for instance, optimal LHC observables in an easily interpretable form. We
introduce the method using the effect of a dimension-6 coefficient on
associated ZH production. We then validate it for the known case of
CP-violation in weak-boson-fusion Higgs production, including detector effects.
|
[
{
"created": "Tue, 21 Sep 2021 19:38:27 GMT",
"version": "v1"
},
{
"created": "Mon, 15 Nov 2021 08:58:45 GMT",
"version": "v2"
},
{
"created": "Tue, 31 Jan 2023 09:14:32 GMT",
"version": "v3"
}
] |
2024-01-31
|
[
[
"Butter",
"Anja",
""
],
[
"Plehn",
"Tilman",
""
],
[
"Soybelman",
"Nathalie",
""
],
[
"Brehmer",
"Johann",
""
]
] |
While neural networks offer an attractive way to numerically encode functions, actual formulas remain the language of theoretical particle physics. We show how symbolic regression trained on matrix-element information provides, for instance, optimal LHC observables in an easily interpretable form. We introduce the method using the effect of a dimension-6 coefficient on associated ZH production. We then validate it for the known case of CP-violation in weak-boson-fusion Higgs production, including detector effects.
|
hep-ph/9906233
| null |
Howard Baer, Manuel Drees, Frank Paige, Pamela Quintana and Xerxes
Tata
|
Trilepton Signal for Supersymmetry at the Fermilab Tevatron Revisited
|
final version to coincide with published manuscript
|
Phys.Rev. D61 (2000) 095007
|
10.1103/PhysRevD.61.095007
|
FSU-HEP-990509, IFT-P.041/99, BNL-HET-99/12, UH-511-933-99
|
hep-ph
| null |
Within a wide class of models, the LEP2 lower limit of 95 GeV on the chargino
mass implies gluinos are heavier than $\sim$300 GeV. In this case electroweak
$\tw_1\twb_1$ and $\tw_1\tz_2$ production are the dominant SUSY processes at
the Tevatron, and the extensively examined isolated trilepton signal from
$\tw_1\tz_2$ production assumes an even greater importance. We update our
previous calculations of the SUSY reach of luminosity upgrades of the Fermilab
Tevatron in this channel incorporating ({\it i}) decay matrix elements in the
computation of the momenta of leptons from chargino and neutralino decays,
({\it ii}) the trilepton background from $W^*Z^*$ and $W^*\gamma^*$ production
which, though neglected in previous analyses, turns out to be the dominant
background, and finally, ({\it iii}) modified sets of cuts designed to reduce
these new backgrounds and increase the range of model parameters for which the
signal is observable. We show our improved projections for the reach for SUSY
of both the Fermilab Main Injector and the proposed TeV33 upgrade. We also
present opposite sign same flavor dilepton invariant mass distributions as well
as the $p_T$ distributions of leptons in SUSY trilepton events, and comment
upon how the inclusion of decay matrix elements impacts upon the Tevatron
reach, as well as upon the extraction of neutralino masses.
|
[
{
"created": "Thu, 3 Jun 1999 14:15:49 GMT",
"version": "v1"
},
{
"created": "Thu, 8 Jul 1999 19:30:29 GMT",
"version": "v2"
},
{
"created": "Thu, 6 Apr 2000 21:01:02 GMT",
"version": "v3"
}
] |
2016-09-06
|
[
[
"Baer",
"Howard",
""
],
[
"Drees",
"Manuel",
""
],
[
"Paige",
"Frank",
""
],
[
"Quintana",
"Pamela",
""
],
[
"Tata",
"Xerxes",
""
]
] |
Within a wide class of models, the LEP2 lower limit of 95 GeV on the chargino mass implies gluinos are heavier than $\sim$300 GeV. In this case electroweak $\tw_1\twb_1$ and $\tw_1\tz_2$ production are the dominant SUSY processes at the Tevatron, and the extensively examined isolated trilepton signal from $\tw_1\tz_2$ production assumes an even greater importance. We update our previous calculations of the SUSY reach of luminosity upgrades of the Fermilab Tevatron in this channel incorporating ({\it i}) decay matrix elements in the computation of the momenta of leptons from chargino and neutralino decays, ({\it ii}) the trilepton background from $W^*Z^*$ and $W^*\gamma^*$ production which, though neglected in previous analyses, turns out to be the dominant background, and finally, ({\it iii}) modified sets of cuts designed to reduce these new backgrounds and increase the range of model parameters for which the signal is observable. We show our improved projections for the reach for SUSY of both the Fermilab Main Injector and the proposed TeV33 upgrade. We also present opposite sign same flavor dilepton invariant mass distributions as well as the $p_T$ distributions of leptons in SUSY trilepton events, and comment upon how the inclusion of decay matrix elements impacts upon the Tevatron reach, as well as upon the extraction of neutralino masses.
|
hep-ph/9702379
|
Wally Melnitchouk
|
Xiangdong Ji, W. Melnitchouk (U. Maryland) and X. Song (U. Virginia)
|
A Study of Off-Forward Parton Distributions
|
29 pages revtex, 12 postscript figures, minor corrections, references
updated
|
Phys.Rev. D56 (1997) 5511-5523
|
10.1103/PhysRevD.56.5511
|
UMD PP 97-085, INPP-UVA-97-01
|
hep-ph nucl-th
| null |
An extensive theoretical analysis of off-forward parton distributions (OFPDs)
is presented. The OFPDs and the form factors of the quark energy-momentum
tensor are estimated at a low-energy scale using a bag model. Relations among
the second moments of OFPDs, the form factors, and the fraction of the nucleon
spin carried by quarks are discussed.
|
[
{
"created": "Fri, 21 Feb 1997 00:53:49 GMT",
"version": "v1"
},
{
"created": "Thu, 27 Feb 1997 22:07:13 GMT",
"version": "v2"
}
] |
2009-10-30
|
[
[
"Ji",
"Xiangdong",
"",
"U. Maryland"
],
[
"Melnitchouk",
"W.",
"",
"U. Maryland"
],
[
"Song",
"X.",
"",
"U. Virginia"
]
] |
An extensive theoretical analysis of off-forward parton distributions (OFPDs) is presented. The OFPDs and the form factors of the quark energy-momentum tensor are estimated at a low-energy scale using a bag model. Relations among the second moments of OFPDs, the form factors, and the fraction of the nucleon spin carried by quarks are discussed.
|
hep-ph/0412424
|
James Wells
|
Stephen P. Martin, Kazuhiro Tobe, James D. Wells
|
Virtual effects of light gauginos and higgsinos: a precision electroweak
analysis of split supersymmetry
|
22 pages, 5 figures, v2: typos fixed and note added
|
Phys.Rev. D71 (2005) 073014
|
10.1103/PhysRevD.71.073014
| null |
hep-ph
| null |
We compute corrections to precision electroweak observables in supersymmetry
in the limit that scalar superpartners are very massive and decoupled. This
leaves charginos and neutralinos and a Standard Model-like Higgs boson as the
only states with unknown mass substantially affecting the analysis. We give
complete formulas for the chargino and neutralino contributions, derive simple
analytic results for the pure gaugino and higgsino cases, and study the general
case. We find that in all circumstances, the precision electroweak fit improves
when the charginos and neutralinos are near the current direct limits. Larger
higgsino and gaugino masses worsen the fit as the theory predictions
asymptotically approach those of the Standard Model. Since the Standard Model
is considered by most to be an adequate fit to the precision electroweak data,
an important corollary to our analysis is that all regions of parameter space
allowed by direct collider constraints are also allowed by precision
electroweak constraints in split supersymmetry.
|
[
{
"created": "Thu, 30 Dec 2004 19:55:03 GMT",
"version": "v1"
},
{
"created": "Wed, 20 Apr 2005 18:28:28 GMT",
"version": "v2"
}
] |
2009-11-10
|
[
[
"Martin",
"Stephen P.",
""
],
[
"Tobe",
"Kazuhiro",
""
],
[
"Wells",
"James D.",
""
]
] |
We compute corrections to precision electroweak observables in supersymmetry in the limit that scalar superpartners are very massive and decoupled. This leaves charginos and neutralinos and a Standard Model-like Higgs boson as the only states with unknown mass substantially affecting the analysis. We give complete formulas for the chargino and neutralino contributions, derive simple analytic results for the pure gaugino and higgsino cases, and study the general case. We find that in all circumstances, the precision electroweak fit improves when the charginos and neutralinos are near the current direct limits. Larger higgsino and gaugino masses worsen the fit as the theory predictions asymptotically approach those of the Standard Model. Since the Standard Model is considered by most to be an adequate fit to the precision electroweak data, an important corollary to our analysis is that all regions of parameter space allowed by direct collider constraints are also allowed by precision electroweak constraints in split supersymmetry.
|
hep-ph/9712298
|
Martin Beneke
|
M. Beneke (CERN)
|
Quarkonium polarization as a test of non-relativistic effective theory
|
6 pages, LaTeX, 3 figures included via epsf.sty, uses sprocl.sty
(provided)
| null | null |
CERN-TH/97-355
|
hep-ph
| null |
I compare current approaches to quarkonium production with regard to what
they tell us about quarkonium polarization. Predictions for $J/\psi$
polarization in hadron-hadron and photon-hadron collisions are summarized.
|
[
{
"created": "Mon, 8 Dec 1997 15:00:31 GMT",
"version": "v1"
}
] |
2007-05-23
|
[
[
"Beneke",
"M.",
"",
"CERN"
]
] |
I compare current approaches to quarkonium production with regard to what they tell us about quarkonium polarization. Predictions for $J/\psi$ polarization in hadron-hadron and photon-hadron collisions are summarized.
|
2112.09867
|
Samadrita Mukherjee
|
Md. Isha Ali, Manimala Chakraborti, Utpal Chattopadhyay, Samadrita
Mukherjee
|
Muon and Electron $(g-2)$ Anomalies with Non-Holomorphic Interactions in
MSSM
|
Some changes in the texts and in a few figures, results and
conclusion unchanged, accepted in EPJC
|
The European Physical Journal C volume 83, Article number: 60
(2023)
|
10.1140/epjc/s10052-023-11216-4
| null |
hep-ph
|
http://creativecommons.org/licenses/by/4.0/
|
The recent Fermilab muon $g-2$ result and the same for electron due to
fine-structure constant measurement through ${}^{133}{\rm Cs}$ matter-wave
interferometry are probed in relation to MSSM with non-holomorphic (NH)
trilinear soft SUSY breaking terms, referred as NHSSM. Supersymmetric
contributions to charged lepton $(g-2)_l$ can be enhanced via the new trilinear
terms involving a wrong Higgs coupling with left and right-handed scalars.
Unlike many MSSM based analyses, the model does not require a light
electroweakino, or light sleptons, or unequal left and right slepton masses, or
a very large higgsino mass parameter. The first part of the analysis involves
$(g-2)_\mu$ constraint along with limits from Higgs mass, B-physics, collider
data, direct detection of dark matter (DM) while focusing on a higgsino DM
which is underabundant in nature. We then impose the constraint from electron
$g-2$ where a large Yukawa threshold corrections (an outcome of NHSSM) and
opposite signs of trilinear NH coefficients associated with $\mu$ and $e$
fields are used to satisfy the dual limits of $\Delta {a_\mu}$ and $\Delta
{a_e}$ (where the latter comes with negative sign). Varying Yukawa threshold
corrections further provide the necessary flavor-dependent enhancement of
$\Delta {a_e}/m_e^2$ compared to that of $\Delta {a_\mu}/m_\mu^2$. A larger
Yukawa threshold correction through $A^\prime_e$ for $y_e$ also takes away the
direct proportionality of $a_e$ with respect to $\tan\beta$. With a finite
intercept, $a_e$ becomes only an increasing function of $\tan\beta$. We
identified the available parameter space in the two cases while also applying
the ATLAS data on slepton pair production in the plane of slepton mass
parameter and the mass of the lightest neutralino.
|
[
{
"created": "Sat, 18 Dec 2021 07:44:43 GMT",
"version": "v1"
},
{
"created": "Fri, 24 Jun 2022 15:04:06 GMT",
"version": "v2"
},
{
"created": "Tue, 24 Jan 2023 06:10:00 GMT",
"version": "v3"
}
] |
2023-01-25
|
[
[
"Ali",
"Md. Isha",
""
],
[
"Chakraborti",
"Manimala",
""
],
[
"Chattopadhyay",
"Utpal",
""
],
[
"Mukherjee",
"Samadrita",
""
]
] |
The recent Fermilab muon $g-2$ result and the same for electron due to fine-structure constant measurement through ${}^{133}{\rm Cs}$ matter-wave interferometry are probed in relation to MSSM with non-holomorphic (NH) trilinear soft SUSY breaking terms, referred as NHSSM. Supersymmetric contributions to charged lepton $(g-2)_l$ can be enhanced via the new trilinear terms involving a wrong Higgs coupling with left and right-handed scalars. Unlike many MSSM based analyses, the model does not require a light electroweakino, or light sleptons, or unequal left and right slepton masses, or a very large higgsino mass parameter. The first part of the analysis involves $(g-2)_\mu$ constraint along with limits from Higgs mass, B-physics, collider data, direct detection of dark matter (DM) while focusing on a higgsino DM which is underabundant in nature. We then impose the constraint from electron $g-2$ where a large Yukawa threshold corrections (an outcome of NHSSM) and opposite signs of trilinear NH coefficients associated with $\mu$ and $e$ fields are used to satisfy the dual limits of $\Delta {a_\mu}$ and $\Delta {a_e}$ (where the latter comes with negative sign). Varying Yukawa threshold corrections further provide the necessary flavor-dependent enhancement of $\Delta {a_e}/m_e^2$ compared to that of $\Delta {a_\mu}/m_\mu^2$. A larger Yukawa threshold correction through $A^\prime_e$ for $y_e$ also takes away the direct proportionality of $a_e$ with respect to $\tan\beta$. With a finite intercept, $a_e$ becomes only an increasing function of $\tan\beta$. We identified the available parameter space in the two cases while also applying the ATLAS data on slepton pair production in the plane of slepton mass parameter and the mass of the lightest neutralino.
|
hep-ph/0605246
|
Fran\c{c}ois Gelis
|
Francois Gelis, Raju Venugopalan
|
Particle production in field theories coupled to strong external
sources. II: Generating functions
|
24 pages, 6 figures, version to appear in NPA
|
Nucl.Phys. A779 (2006) 177-196
|
10.1016/j.nuclphysa.2006.08.015
| null |
hep-ph hep-th nucl-ex nucl-th
| null |
We discuss a method for computing the generating function for the
multiplicity distribution in field theories with strong time dependent external
sources. At leading order, the computation of the generating function reduces
to finding a pair of solutions of the classical equations of motion, with
non-standard temporal boundary conditions.
|
[
{
"created": "Tue, 23 May 2006 14:43:19 GMT",
"version": "v1"
},
{
"created": "Mon, 2 Oct 2006 08:42:19 GMT",
"version": "v2"
}
] |
2009-11-11
|
[
[
"Gelis",
"Francois",
""
],
[
"Venugopalan",
"Raju",
""
]
] |
We discuss a method for computing the generating function for the multiplicity distribution in field theories with strong time dependent external sources. At leading order, the computation of the generating function reduces to finding a pair of solutions of the classical equations of motion, with non-standard temporal boundary conditions.
|
hep-ph/0105104
|
Kristof Redlich
|
Krzysztof Redlich
|
Strangeness production in heavy ion collisions
|
10 pages, 14 figures, Plenary talk given at 15th International
Conference on Ultrarelativistic Nucleus-Nucleus Collisions (QM2001), Stony
Brook, New York, 15-20 Jan 2001
|
Nucl.Phys. A698 (2002) 94-103
|
10.1016/S0375-9474(01)01352-5
|
GSI-Preprint-2001-14
|
hep-ph
| null |
Strangeness production in heavy ion collisions is discussed in a broad energy
range from SIS to RHIC. %We emphasize that in the In the whole energy range
particle yields are showing high level of chemical equilibration which can be
described by the unified freezeout conditions of fixed energy/particle $\simeq
1$GeV. The statistical model within the canonical formulation of strangeness
conservation provides a framework to describe the observed enhancement of
(multi)strange particles from p+A to A+A collisions measured at the SPS energy
and predicts that this enhancement should be larger for decreasing collision
energy. However, only at the SPS and RHIC chemical freezeout temperature is
consistent within error with the critical value required for deconfinement and
simultaneously strangeness is uncorrelated and distributed in the whole volume
of the fireball.
|
[
{
"created": "Fri, 11 May 2001 18:11:08 GMT",
"version": "v1"
}
] |
2009-11-07
|
[
[
"Redlich",
"Krzysztof",
""
]
] |
Strangeness production in heavy ion collisions is discussed in a broad energy range from SIS to RHIC. %We emphasize that in the In the whole energy range particle yields are showing high level of chemical equilibration which can be described by the unified freezeout conditions of fixed energy/particle $\simeq 1$GeV. The statistical model within the canonical formulation of strangeness conservation provides a framework to describe the observed enhancement of (multi)strange particles from p+A to A+A collisions measured at the SPS energy and predicts that this enhancement should be larger for decreasing collision energy. However, only at the SPS and RHIC chemical freezeout temperature is consistent within error with the critical value required for deconfinement and simultaneously strangeness is uncorrelated and distributed in the whole volume of the fireball.
|
0809.4835
|
Zhang He
|
Tommy Ohlsson and He Zhang
|
Non-Standard Interaction Effects at Reactor Neutrino Experiments
|
17 pages, 5 figures, version to appear in PLB
|
Phys.Lett.B671:99-104,2009
|
10.1016/j.physletb.2008.12.005
| null |
hep-ph hep-ex
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We study non-standard interactions (NSIs) at reactor neutrino experiments,
and in particular, the mimicking effects on \theta_13. We present generic
formulas for oscillation probabilities including NSIs from sources and
detectors. Instructive mappings between the fundamental leptonic mixing
parameters and the effective leptonic mixing parameters are established. In
addition, NSI corrections to the mixing angles \theta_13 and \theta_12 are
discussed in detailed. Finally, we show that, even for a vanishing \theta_13,
an oscillation phenomenon may still be observed in future short baseline
reactor neutrino experiments, such as Double Chooz and Daya Bay, due to the
existences of NSIs.
|
[
{
"created": "Sun, 28 Sep 2008 10:46:47 GMT",
"version": "v1"
},
{
"created": "Wed, 10 Dec 2008 09:17:48 GMT",
"version": "v2"
}
] |
2009-01-16
|
[
[
"Ohlsson",
"Tommy",
""
],
[
"Zhang",
"He",
""
]
] |
We study non-standard interactions (NSIs) at reactor neutrino experiments, and in particular, the mimicking effects on \theta_13. We present generic formulas for oscillation probabilities including NSIs from sources and detectors. Instructive mappings between the fundamental leptonic mixing parameters and the effective leptonic mixing parameters are established. In addition, NSI corrections to the mixing angles \theta_13 and \theta_12 are discussed in detailed. Finally, we show that, even for a vanishing \theta_13, an oscillation phenomenon may still be observed in future short baseline reactor neutrino experiments, such as Double Chooz and Daya Bay, due to the existences of NSIs.
|
hep-ph/0306304
|
Thomas Kernreiter
|
A. Bartl, H. Fraas, T. Kernreiter, O. Kittel
|
T-odd Correlations in the Decay of Scalar Fermions
|
18 pages, 5 figures, 2 tables; comments and references added; two
tables added; version to appear in Eur. Phys. J
|
Eur.Phys.J. C33 (2004) 433-442
|
10.1140/epjc/s2003-01521-9
| null |
hep-ph
| null |
We define a CP sensitive asymmetry in the sfermion decays $\ti f \to f
\ti\chi^0_j \ell \bar \ell, f \ti\chi^0_j q \bar q$, based on triple product
correlations between the momenta of the outgoing fermions. We study this
asymmetry in the MSSM with complex parameters. We show that the asymmetry is
sensitive to the phases of the parameters $\mu$ and $M_1$. The leading
contribution stems from the decay chain $\ti f\to f \ti\chi^0_j\to f
\ti\chi^0_1 Z\to f \ti\chi^0_1 \ell \bar \ell (f \ti\chi^0_1 q \bar q)$, for
which we obtain analytic formulae for the amplitude squared. The asymmetry can
go up to 3% for $\ti f\to f \ti\chi^0_1 \ell \bar \ell$, and up to 20% for $\ti
f\to f \ti\chi^0_1 q \bar q$. We also estimate the rates necessary to measure
the asymmetry.
|
[
{
"created": "Mon, 30 Jun 2003 15:17:12 GMT",
"version": "v1"
},
{
"created": "Fri, 21 Nov 2003 14:07:14 GMT",
"version": "v2"
}
] |
2009-11-10
|
[
[
"Bartl",
"A.",
""
],
[
"Fraas",
"H.",
""
],
[
"Kernreiter",
"T.",
""
],
[
"Kittel",
"O.",
""
]
] |
We define a CP sensitive asymmetry in the sfermion decays $\ti f \to f \ti\chi^0_j \ell \bar \ell, f \ti\chi^0_j q \bar q$, based on triple product correlations between the momenta of the outgoing fermions. We study this asymmetry in the MSSM with complex parameters. We show that the asymmetry is sensitive to the phases of the parameters $\mu$ and $M_1$. The leading contribution stems from the decay chain $\ti f\to f \ti\chi^0_j\to f \ti\chi^0_1 Z\to f \ti\chi^0_1 \ell \bar \ell (f \ti\chi^0_1 q \bar q)$, for which we obtain analytic formulae for the amplitude squared. The asymmetry can go up to 3% for $\ti f\to f \ti\chi^0_1 \ell \bar \ell$, and up to 20% for $\ti f\to f \ti\chi^0_1 q \bar q$. We also estimate the rates necessary to measure the asymmetry.
|
hep-ph/0609180
|
Ayres Freitas
|
A. Freitas, P. Z. Skands
|
Testing the SUSY-QCD Yukawa coupling in a combined LHC/ILC analysis
|
5pp, slightly expanded version of contributions to the Proc. of the
Linear Collider Workshop (LCWS 06), Bangalore, India, 9-13 March 2006, and
the Proc. of the 14th International Conference on Supersymmetry and the
Unification of Fundamental Interactions (SUSY 06), Irvine, California, USA,
12-17 June 2006
|
Pramana 69:843-848,2007
|
10.1007/s12043-007-0193-3
|
FERMILAB-CONF-06-322-T
|
hep-ph
| null |
In order to establish supersymmetry (SUSY) at future colliders, the identity
of gauge couplings and the corresponding Yukawa couplings between gauginos,
sfermions and fermions needs to be verified. Here a first phenomenological
study for determining the Yukawa coupling of the SUSY-QCD sector is presented,
using a method which combines information from LHC and ILC.
|
[
{
"created": "Tue, 19 Sep 2006 13:22:59 GMT",
"version": "v1"
}
] |
2009-12-15
|
[
[
"Freitas",
"A.",
""
],
[
"Skands",
"P. Z.",
""
]
] |
In order to establish supersymmetry (SUSY) at future colliders, the identity of gauge couplings and the corresponding Yukawa couplings between gauginos, sfermions and fermions needs to be verified. Here a first phenomenological study for determining the Yukawa coupling of the SUSY-QCD sector is presented, using a method which combines information from LHC and ILC.
|
2301.11484
|
Fabian Rennecke
|
Fabian Rennecke, Robert D. Pisarski and Dirk H. Rischke
|
Particle Interferometry in a Moat Regime
|
14 pages, 8 figures
| null |
10.1103/PhysRevD.107.116011
| null |
hep-ph nucl-ex nucl-th
|
http://creativecommons.org/licenses/by/4.0/
|
Dense strongly interacting matter can exhibit regimes with spatial
modulations, akin to crystalline phases. In this case particles can have a moat
spectrum with minimal energy at nonzero momentum. We show that particle
interferometry is a sensitive probe of such a regime in heavy-ion collisions.
To this end, we develop a field-theoretical formalism that relates particle
spectra to in-medium real-time correlation functions of quantum fields on
curved hypersurfaces of spacetime. This is then applied to the study of
Bose-Einstein correlations in a moat regime in heavy-ion collisions. The
resulting two-particle spectra exhibit peaks at nonzero average pair momentum,
in contrast to the two-particle spectra in a normal phase, which peak at zero
momentum. These peaks lead to non-trivial structures in the ratio of
two-particle correlation functions, which should be experimentally measurable
if the resolution in the direction of average pair momentum is sufficiently
large. We propose these structures in the correlation-function ratios as clear
signature of a moat regime and spatially modulated phases in quantum
chromodynamics (QCD).
|
[
{
"created": "Fri, 27 Jan 2023 01:26:45 GMT",
"version": "v1"
}
] |
2023-06-21
|
[
[
"Rennecke",
"Fabian",
""
],
[
"Pisarski",
"Robert D.",
""
],
[
"Rischke",
"Dirk H.",
""
]
] |
Dense strongly interacting matter can exhibit regimes with spatial modulations, akin to crystalline phases. In this case particles can have a moat spectrum with minimal energy at nonzero momentum. We show that particle interferometry is a sensitive probe of such a regime in heavy-ion collisions. To this end, we develop a field-theoretical formalism that relates particle spectra to in-medium real-time correlation functions of quantum fields on curved hypersurfaces of spacetime. This is then applied to the study of Bose-Einstein correlations in a moat regime in heavy-ion collisions. The resulting two-particle spectra exhibit peaks at nonzero average pair momentum, in contrast to the two-particle spectra in a normal phase, which peak at zero momentum. These peaks lead to non-trivial structures in the ratio of two-particle correlation functions, which should be experimentally measurable if the resolution in the direction of average pair momentum is sufficiently large. We propose these structures in the correlation-function ratios as clear signature of a moat regime and spatially modulated phases in quantum chromodynamics (QCD).
|
0809.0710
|
Howard Baer
|
Howard Baer, Sabine Kraml, Sezen Sekmen, Heaya Summy
|
Prospects for Yukawa Unified SO(10) SUSY GUTs at the CERN LHC
|
25 pages including 18 EPS figures
|
JHEP 0810:079,2008
|
10.1088/1126-6708/2008/10/079
|
FSU-HEP-080822, LPSC 08-133
|
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
The requirement of t-b-\tau Yukawa coupling unification is common in simple
grand unified models based on the gauge group SO(10), and it also places a
severe constraint on the expected spectrum of superpartners. For Yukawa-unified
models with \mu >0, the spectrum is characterized by three mass scales: {\it
i}). first and second generation scalars in the multi-TeV range, {\it ii}).
third generation scalars, \mu and m_A in the few-TeV range and {\it iii}).
gluinos in the \sim 350-500 GeV range with chargino masses around 100-160 GeV.
In such a scenario, gluino pair production should occur at large rates at the
CERN LHC, followed by gluino three-body decays into neutralinos or charginos.
Discovery of Yukawa-unified SUSY at the LHC should hence be possible with only
1 fb^{-1} of integrated luminosity, by tagging multi-jet events with 2--3
isolated leptons, without relying on missing E_T. A characteristic dilepton
mass edge should easily be apparent above Standard Model background. Combining
dileptons with b-jets, along with the gluino pair production cross section
information, should allow for gluino and neutralino mass reconstruction. A
secondary corroborative signal should be visible at higher integrated
luminosity in the W1Z2-> 3\ell channel, and should exhibit the same dilepton
mass edge as in the gluino cascade decay signal.
|
[
{
"created": "Wed, 3 Sep 2008 21:13:29 GMT",
"version": "v1"
}
] |
2009-05-08
|
[
[
"Baer",
"Howard",
""
],
[
"Kraml",
"Sabine",
""
],
[
"Sekmen",
"Sezen",
""
],
[
"Summy",
"Heaya",
""
]
] |
The requirement of t-b-\tau Yukawa coupling unification is common in simple grand unified models based on the gauge group SO(10), and it also places a severe constraint on the expected spectrum of superpartners. For Yukawa-unified models with \mu >0, the spectrum is characterized by three mass scales: {\it i}). first and second generation scalars in the multi-TeV range, {\it ii}). third generation scalars, \mu and m_A in the few-TeV range and {\it iii}). gluinos in the \sim 350-500 GeV range with chargino masses around 100-160 GeV. In such a scenario, gluino pair production should occur at large rates at the CERN LHC, followed by gluino three-body decays into neutralinos or charginos. Discovery of Yukawa-unified SUSY at the LHC should hence be possible with only 1 fb^{-1} of integrated luminosity, by tagging multi-jet events with 2--3 isolated leptons, without relying on missing E_T. A characteristic dilepton mass edge should easily be apparent above Standard Model background. Combining dileptons with b-jets, along with the gluino pair production cross section information, should allow for gluino and neutralino mass reconstruction. A secondary corroborative signal should be visible at higher integrated luminosity in the W1Z2-> 3\ell channel, and should exhibit the same dilepton mass edge as in the gluino cascade decay signal.
|
1201.2085
|
Ernst Trojan
|
Ernst Trojan
|
Superluminal self-interacting neutrino
|
13 pages, no figures
| null | null | null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
The effect of nonlinear self-interaction can be associated with superluminal
velocity of neutrino. The power energy spectrum E=p+Cp^a is derived from the
nonlinear Dirac equation when interaction term V=\lambda (\psi \gamma_\mu \psi
\psi \gamma^\mu \psi)^a is added to the Lagrangian of a free spin-1/2 particle.
The superluminal velocity recorded by the OPERA and MINOS collaborations is
achieved when the coupling constants are taken in the range a=0.4-1.18 and
\lambda =-(0.5-1.6)x10^-4. The self-interaction Lagrangian V=\lambda (\psi
\gamma_\mu \psi \psi \gamma ^\mu \psi) with the coupling constant \lambda
=-(0.7-0.9)x10^-4 yields the same result. Scalar interaction V=\lambda (\psi
\psi)^b and scalar-vector interaction \lambda(\psi^{+}\psi)^{b+1}/(\psi \psi)^b
cannot be responsible for the observed superluminal neutrino.
|
[
{
"created": "Mon, 9 Jan 2012 16:24:44 GMT",
"version": "v1"
}
] |
2012-01-11
|
[
[
"Trojan",
"Ernst",
""
]
] |
The effect of nonlinear self-interaction can be associated with superluminal velocity of neutrino. The power energy spectrum E=p+Cp^a is derived from the nonlinear Dirac equation when interaction term V=\lambda (\psi \gamma_\mu \psi \psi \gamma^\mu \psi)^a is added to the Lagrangian of a free spin-1/2 particle. The superluminal velocity recorded by the OPERA and MINOS collaborations is achieved when the coupling constants are taken in the range a=0.4-1.18 and \lambda =-(0.5-1.6)x10^-4. The self-interaction Lagrangian V=\lambda (\psi \gamma_\mu \psi \psi \gamma ^\mu \psi) with the coupling constant \lambda =-(0.7-0.9)x10^-4 yields the same result. Scalar interaction V=\lambda (\psi \psi)^b and scalar-vector interaction \lambda(\psi^{+}\psi)^{b+1}/(\psi \psi)^b cannot be responsible for the observed superluminal neutrino.
|
1111.6576
|
Christian Spethmann
|
Christian Spethmann
|
Constraints on W Prime Models for the ttbar Asymmetry
|
Talk given at the SUSY 2011 conference. 5 pages, 3 figures
| null | null | null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We discuss if the Tevatron ttbar asymmetry can be explained by T-channel
exchange of a W' gauge boson coupling to down and top quarks. In a
spontaneously broken gauge theory, such a W' is necessarily accompanied by a Z'
at a similar mass scale. Null results from Tevatron searches for dijet and
dilepton resonances imply large mass splitting between the $W'$ and $Z'$. We
argue that such splitting can only be accomplished if the gauge symmetry is
broken by a scalar in a large dimension representation of the gauge group, for
which no perturbative description exists.
|
[
{
"created": "Mon, 28 Nov 2011 20:44:10 GMT",
"version": "v1"
}
] |
2011-11-29
|
[
[
"Spethmann",
"Christian",
""
]
] |
We discuss if the Tevatron ttbar asymmetry can be explained by T-channel exchange of a W' gauge boson coupling to down and top quarks. In a spontaneously broken gauge theory, such a W' is necessarily accompanied by a Z' at a similar mass scale. Null results from Tevatron searches for dijet and dilepton resonances imply large mass splitting between the $W'$ and $Z'$. We argue that such splitting can only be accomplished if the gauge symmetry is broken by a scalar in a large dimension representation of the gauge group, for which no perturbative description exists.
|
1501.04103
|
Mao Zeng
|
S. Dawson, I. M. Lewis, Mao Zeng
|
Usefulness of effective field theory for boosted Higgs production
|
21 pages, 13 figures. Minor changes made in version 2
|
Phys. Rev. D 91, 074012 (2015)
|
10.1103/PhysRevD.91.074012
|
SLAC-PUB-16208
|
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
The Higgs + jet channel at the LHC is sensitive to the effects of new physics
both in the total rate and in the transverse momentum distribution at high p_T.
We examine the production process using an effective field theory (EFT)
language and discuss the possibility of determining the nature of the
underlying high scale physics from boosted Higgs production. The effects of
heavy color triplet scalars and top partner fermions with TeV scale masses are
considered as examples and Higgs-gluon couplings of dimension-5 and dimension-7
are included in the EFT. As a by-product of our study, we examine the region of
validity of the EFT. Dimension-7 contributions in realistic new physics models
give effects in the high p_T tail of the Higgs signal which are so tiny that
they are likely to be unobservable.
|
[
{
"created": "Fri, 16 Jan 2015 21:00:04 GMT",
"version": "v1"
},
{
"created": "Wed, 22 Apr 2015 17:14:02 GMT",
"version": "v2"
}
] |
2015-04-24
|
[
[
"Dawson",
"S.",
""
],
[
"Lewis",
"I. M.",
""
],
[
"Zeng",
"Mao",
""
]
] |
The Higgs + jet channel at the LHC is sensitive to the effects of new physics both in the total rate and in the transverse momentum distribution at high p_T. We examine the production process using an effective field theory (EFT) language and discuss the possibility of determining the nature of the underlying high scale physics from boosted Higgs production. The effects of heavy color triplet scalars and top partner fermions with TeV scale masses are considered as examples and Higgs-gluon couplings of dimension-5 and dimension-7 are included in the EFT. As a by-product of our study, we examine the region of validity of the EFT. Dimension-7 contributions in realistic new physics models give effects in the high p_T tail of the Higgs signal which are so tiny that they are likely to be unobservable.
|
0709.2438
|
Gino Isidori
|
Gino Isidori
|
KAON 2007: Conference Summary
|
16 pages, 10 figures, to appear in the proceedings of the
International Conference Kaon'07, Laboratori Nazionali di Frascati, Italy,
21-25 May 2007
|
PoSKAON:064,2008
| null | null |
hep-ph
| null |
A concise overview of the interesting recent developments in kaon phyiscs
discussed at KAON 2007 is presented.
|
[
{
"created": "Sat, 15 Sep 2007 18:03:27 GMT",
"version": "v1"
}
] |
2008-11-26
|
[
[
"Isidori",
"Gino",
""
]
] |
A concise overview of the interesting recent developments in kaon phyiscs discussed at KAON 2007 is presented.
|
1112.5158
|
Torsten Bringmann
|
Masaki Asano, Torsten Bringmann, Christoph Weniger
|
Indirect dark matter searches as a probe of degenerate particle spectra
|
6 pages, 4 figures; minor updates to match the published version
|
Physics Letters B 709 (2012), pp. 128-132
|
10.1016/j.physletb.2012.02.017
| null |
hep-ph astro-ph.CO
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We consider the possibility that the cosmological dark matter consists of
particles very close in mass to new colored particles below the TeV scale.
While such a scenario is inherently difficult to directly confirm at colliders,
we find that indirect dark matter searches may be a powerful alternative. In
particular, we show that in this case dark matter annihilation to
quark-quark-gluon final states can give rise to significant antiproton (but
also gamma-ray) fluxes, and compare the resulting constraints to bounds from
direct searches at LEP, the Tevatron and the LHC. For supersymmetric
neutralinos degenerate with squarks, e.g., antiprotons can give rise to more
stringent constraints for masses below around 45-80 GeV.
|
[
{
"created": "Wed, 21 Dec 2011 20:59:24 GMT",
"version": "v1"
},
{
"created": "Fri, 2 Mar 2012 09:21:23 GMT",
"version": "v2"
}
] |
2012-03-05
|
[
[
"Asano",
"Masaki",
""
],
[
"Bringmann",
"Torsten",
""
],
[
"Weniger",
"Christoph",
""
]
] |
We consider the possibility that the cosmological dark matter consists of particles very close in mass to new colored particles below the TeV scale. While such a scenario is inherently difficult to directly confirm at colliders, we find that indirect dark matter searches may be a powerful alternative. In particular, we show that in this case dark matter annihilation to quark-quark-gluon final states can give rise to significant antiproton (but also gamma-ray) fluxes, and compare the resulting constraints to bounds from direct searches at LEP, the Tevatron and the LHC. For supersymmetric neutralinos degenerate with squarks, e.g., antiprotons can give rise to more stringent constraints for masses below around 45-80 GeV.
|
hep-ph/0008223
|
Maxim Pospelov
|
Alon E. Faraggi and Maxim Pospelov
|
Self-Interacting Dark Matter from the Hidden Heterotic-String Sector
|
16 pages. standard LaTex
|
Astropart.Phys.16:451-461,2002
|
10.1016/S0927-6505(01)00121-9
|
OUTP-00-37P, UMN-TH-1918-00, TPI-MINN-00/42
|
hep-ph astro-ph hep-th
| null |
It has been suggested recently that self-interacting dark matter fits better
the observational characteristics of galaxy dynamics. We propose that the
self-interacting dark matter is composed from the glueballs of the hidden
sector non-Abelian gauge group, while the hidden matter states exist in
vector-like representation and decouple from the light spectrum. It is shown
that these glueballs are semi-stable with the life-time larger than the present
age of the Universe, if their mass is 1 GeV or less. The constraint on their
abundance today suggests that the energy was stored in the hidden sector soon
after inflation. This imposes an upper limit on the reheating temperature. We
further study the naturalness of this scenario in the context of the
free-fermionic string models and point out a class of such models where the
self-interacting dark matter from the hidden sector is indeed plausible.
|
[
{
"created": "Mon, 21 Aug 2000 23:27:02 GMT",
"version": "v1"
}
] |
2011-05-23
|
[
[
"Faraggi",
"Alon E.",
""
],
[
"Pospelov",
"Maxim",
""
]
] |
It has been suggested recently that self-interacting dark matter fits better the observational characteristics of galaxy dynamics. We propose that the self-interacting dark matter is composed from the glueballs of the hidden sector non-Abelian gauge group, while the hidden matter states exist in vector-like representation and decouple from the light spectrum. It is shown that these glueballs are semi-stable with the life-time larger than the present age of the Universe, if their mass is 1 GeV or less. The constraint on their abundance today suggests that the energy was stored in the hidden sector soon after inflation. This imposes an upper limit on the reheating temperature. We further study the naturalness of this scenario in the context of the free-fermionic string models and point out a class of such models where the self-interacting dark matter from the hidden sector is indeed plausible.
|
hep-ph/0212153
|
Alexey Kiselev
|
N.N. Achasov and A.V. Kiselev
|
The new analysis of the KLOE data on the phi->eta pi0 gamma decay
|
11 pages, 2 figures
|
Phys.Rev.D68:014006,2003
|
10.1103/PhysRevD.68.014006
| null |
hep-ph hep-ex nucl-th
| null |
In this paper we present the fit to the recent high-statistical KLOE data on
the phi -> eta pi^0 gamma decay. This decay mainly goes through the a_0 gamma
intermediate state. The obtained results differ from those of the previous
fits: data prefer a high a_0 mass and a considerably large a_0 coupling to the
K\bar K}.
|
[
{
"created": "Wed, 11 Dec 2002 06:08:14 GMT",
"version": "v1"
}
] |
2008-11-26
|
[
[
"Achasov",
"N. N.",
""
],
[
"Kiselev",
"A. V.",
""
]
] |
In this paper we present the fit to the recent high-statistical KLOE data on the phi -> eta pi^0 gamma decay. This decay mainly goes through the a_0 gamma intermediate state. The obtained results differ from those of the previous fits: data prefer a high a_0 mass and a considerably large a_0 coupling to the K\bar K}.
|
hep-ph/0308304
|
Magno Machado
|
M.A. Betemps, M.B. Gay Ducati, M.V.T. Machado, J. Raufeisen
|
Dilepton Transverse Momentum in the Color Dipole Approach
|
6 pages, 2 figures. Contribution to 11th International Workshop on
Deep-Inelastic Scattering (DIS03), St. Petersburg, April 2003
| null | null |
LA-UR-03-5879
|
hep-ph
| null |
We investigate the Drell-Yan transverse momentum distribution in the
framework of the color dipole approach. Special attention is paid to parton
saturation effects at high energies. Predictions at LHC energies ($\sqrt{s}=14$
TeV) are given and extrapolated down to ISR energies ($\sqrt{s}=62$ GeV).
Unitarity corrections are implemented through the multiple scattering
Glauber-Mueller approach and are compared with predictions of the BGBK
saturation model.
|
[
{
"created": "Thu, 28 Aug 2003 20:52:00 GMT",
"version": "v1"
}
] |
2007-05-23
|
[
[
"Betemps",
"M. A.",
""
],
[
"Ducati",
"M. B. Gay",
""
],
[
"Machado",
"M. V. T.",
""
],
[
"Raufeisen",
"J.",
""
]
] |
We investigate the Drell-Yan transverse momentum distribution in the framework of the color dipole approach. Special attention is paid to parton saturation effects at high energies. Predictions at LHC energies ($\sqrt{s}=14$ TeV) are given and extrapolated down to ISR energies ($\sqrt{s}=62$ GeV). Unitarity corrections are implemented through the multiple scattering Glauber-Mueller approach and are compared with predictions of the BGBK saturation model.
|
2211.14562
|
Ya-Juan Zheng
|
Junmou Chen, Kaoru Hagiwara, Junichi Kanzaki, Kentarou Mawatari and
Ya-Juan Zheng
|
Helicity amplitudes in light-cone and Feynman-diagram gauges
|
20 pages, 14 figures; references added
| null | null |
KEK-TH-2471, IPMU22-0055
|
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Recently proposed Feynman-diagram (FD) gauge propagator for massless and
massive gauge bosons is obtained from a light-cone (LC) gauge propagator, by
choosing the gauge vector along the opposite direction of the gauge boson
three-momentum. We implement a general LC gauge propagator for all the gauge
bosons of the Standard Model (SM) in the HELicity Amplitude Subroutines (HELAS)
codes, such that all the SM helicity amplitudes can be evaluated at the tree
level in the LC gauge by using MadGraph. We confirm that our numerical codes
produce physical helicity amplitudes which are consistent among all gauge
choices. We then study interference patterns among Feynman amplitudes, for a
few $2\to3$ scattering processes in QED and QCD, and the process
$\gamma\gamma\to W^+W^-$ followed by the $W^\pm$ decays. We find that in a
generic LC gauge, where all the gauge boson propagators share a common gauge
vector, we cannot remove the off-shell current components which grow with their
energy systematically from all the Feynman amplitudes in $2\to3$ processes. On
the other hand, the $5\times5$ LC gauge propagator for the weak bosons removes
components which grow with energy due to the longitudinal polarization mode of
the external bi-fermion currents, and hence can give $2\to2$ weak boson
scattering amplitudes which are free from subtle cancellation at high energies.
The particular choice of the FD gauge vector has advantages over generic LC
gauge, not only because all the terms which grow with energy of off-shell and
on-shell currents are removed systematically from all the diagrams, but also
because no artificial gauge vector direction dependence of individual
amplitudes appears.
|
[
{
"created": "Sat, 26 Nov 2022 13:25:03 GMT",
"version": "v1"
},
{
"created": "Sun, 19 Nov 2023 07:30:06 GMT",
"version": "v2"
}
] |
2023-11-21
|
[
[
"Chen",
"Junmou",
""
],
[
"Hagiwara",
"Kaoru",
""
],
[
"Kanzaki",
"Junichi",
""
],
[
"Mawatari",
"Kentarou",
""
],
[
"Zheng",
"Ya-Juan",
""
]
] |
Recently proposed Feynman-diagram (FD) gauge propagator for massless and massive gauge bosons is obtained from a light-cone (LC) gauge propagator, by choosing the gauge vector along the opposite direction of the gauge boson three-momentum. We implement a general LC gauge propagator for all the gauge bosons of the Standard Model (SM) in the HELicity Amplitude Subroutines (HELAS) codes, such that all the SM helicity amplitudes can be evaluated at the tree level in the LC gauge by using MadGraph. We confirm that our numerical codes produce physical helicity amplitudes which are consistent among all gauge choices. We then study interference patterns among Feynman amplitudes, for a few $2\to3$ scattering processes in QED and QCD, and the process $\gamma\gamma\to W^+W^-$ followed by the $W^\pm$ decays. We find that in a generic LC gauge, where all the gauge boson propagators share a common gauge vector, we cannot remove the off-shell current components which grow with their energy systematically from all the Feynman amplitudes in $2\to3$ processes. On the other hand, the $5\times5$ LC gauge propagator for the weak bosons removes components which grow with energy due to the longitudinal polarization mode of the external bi-fermion currents, and hence can give $2\to2$ weak boson scattering amplitudes which are free from subtle cancellation at high energies. The particular choice of the FD gauge vector has advantages over generic LC gauge, not only because all the terms which grow with energy of off-shell and on-shell currents are removed systematically from all the diagrams, but also because no artificial gauge vector direction dependence of individual amplitudes appears.
|
0902.2803
|
A. D. Polosa
|
NV Drenska, R Faccini, AD Polosa
|
Exotic Hadrons with Hidden Charm and Strangeness
|
6 pages, 2 figures, minor changes made, references added
|
Phys.Rev.D79:077502,2009
|
10.1103/PhysRevD.79.077502
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We investigate on exotic tetraquark hadrons of the kind [cs][cbar sbar] by
computing their spectrum and decay modes within a constituent
diquark-antidiquark model. We also compare these predictions with the present
experimental knowledge.
|
[
{
"created": "Mon, 16 Feb 2009 22:52:15 GMT",
"version": "v1"
},
{
"created": "Fri, 3 Apr 2009 08:59:24 GMT",
"version": "v2"
}
] |
2013-05-29
|
[
[
"Drenska",
"NV",
""
],
[
"Faccini",
"R",
""
],
[
"Polosa",
"AD",
""
]
] |
We investigate on exotic tetraquark hadrons of the kind [cs][cbar sbar] by computing their spectrum and decay modes within a constituent diquark-antidiquark model. We also compare these predictions with the present experimental knowledge.
|
1007.0375
|
Johannes Bluemlein
|
J. Ablinger, I. Bierenbaum, J. Bl\"umlein, A. Hasselhuhhn, S. Klein,
C. Schneider, and F. Wi{\ss}brock
|
Heavy Flavor DIS Wilson coefficients in the asymptotic regime
|
8 pages LATEX, 4 figures, 1 style file
|
Nucl.Phys.Proc.Suppl.205-206:242-249,2010
|
10.1016/j.nuclphysbps.2010.08.050
|
DESY 10-093, SFB/CPP-10-58, IFIC/10-22, TTK-10-38
|
hep-ph hep-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We report on results for the heavy flavor contributions to $F_2(x,Q^2)$ in
the limit $Q^2\gg m^2$ at {\sf NNLO}. By calculating the massive $3$--loop
operator matrix elements, we account for all but the power suppressed terms in
$m^2/Q^2$. Recently, the calculation of fixed Mellin moments of all $3$--loop
massive operator matrix elements has been finished. We present new all--$N$
results for the $O(n_f)$--terms, thereby confirming the corresponding parts of
the $3$--loop anomalous dimensions. Additionally, we report on first genuine
$3$--loop results of the ladder--type diagrams for general values of the Mellin
variable $N$.
|
[
{
"created": "Fri, 2 Jul 2010 14:43:49 GMT",
"version": "v1"
}
] |
2016-08-14
|
[
[
"Ablinger",
"J.",
""
],
[
"Bierenbaum",
"I.",
""
],
[
"Blümlein",
"J.",
""
],
[
"Hasselhuhhn",
"A.",
""
],
[
"Klein",
"S.",
""
],
[
"Schneider",
"C.",
""
],
[
"Wißbrock",
"F.",
""
]
] |
We report on results for the heavy flavor contributions to $F_2(x,Q^2)$ in the limit $Q^2\gg m^2$ at {\sf NNLO}. By calculating the massive $3$--loop operator matrix elements, we account for all but the power suppressed terms in $m^2/Q^2$. Recently, the calculation of fixed Mellin moments of all $3$--loop massive operator matrix elements has been finished. We present new all--$N$ results for the $O(n_f)$--terms, thereby confirming the corresponding parts of the $3$--loop anomalous dimensions. Additionally, we report on first genuine $3$--loop results of the ladder--type diagrams for general values of the Mellin variable $N$.
|
0810.5730
|
Fotios Ptochos
|
P. Giromini, F. Happacher, M. J. Kim, M. Kruse, K. Pitts, F. Ptohos,
and S. Torre
|
Phenomenological interpretation of the multi-muon events reported by the
CDF collaboration
|
6 pages, 9 figures. Submitted to Phys. Rev. D. Rapid Communication
| null | null |
FERMILAB-PUB-08-231-E
|
hep-ph hep-ex
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We present a phenomenological conjecture of new physics that is suggested by
the topology and kinematic properties of the multi-muon events recently
reported by the CDF collaboration. We show that the salient features of the
data can be accounted for by postulating the pair production of three new
states h1, h2, and h3 with masses in the range of 15, 7.3 and 3.6 GeV/c^2,
respectively. The heavier states cascade-decay into the lighter ones, whereas
the lightest state decays into a tau pair with a lifetime of the order of 20
ps.
|
[
{
"created": "Fri, 31 Oct 2008 16:30:33 GMT",
"version": "v1"
}
] |
2008-11-03
|
[
[
"Giromini",
"P.",
""
],
[
"Happacher",
"F.",
""
],
[
"Kim",
"M. J.",
""
],
[
"Kruse",
"M.",
""
],
[
"Pitts",
"K.",
""
],
[
"Ptohos",
"F.",
""
],
[
"Torre",
"S.",
""
]
] |
We present a phenomenological conjecture of new physics that is suggested by the topology and kinematic properties of the multi-muon events recently reported by the CDF collaboration. We show that the salient features of the data can be accounted for by postulating the pair production of three new states h1, h2, and h3 with masses in the range of 15, 7.3 and 3.6 GeV/c^2, respectively. The heavier states cascade-decay into the lighter ones, whereas the lightest state decays into a tau pair with a lifetime of the order of 20 ps.
|
1304.6856
|
Tanushree Basak
|
Tanushree Basak, Subhendra Mohanty
|
130 GeV gamma ray line and enhanced Higgs di-photon rate from
Triplet-Singlet extended MSSM
|
ref. updated, version accepted for publication in JHEP
|
JHEP08(2013)020
|
10.1007/JHEP08(2013)020
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We propose an economic extension of minimal supersymmetric standard model
with a SU(2) singlet and Y=0 triplet, which can explain (i) the 125 GeV Higgs
boson without fine tuning, (ii) the 130 GeV $\gamma$-ray line seen at
Fermi-LAT, (as well as a second photon line at 114 GeV)(iii) an enhanced Higgs
di-photon decay rate seen by ATLAS, while being consistent with dark matter
relic density and recent XENON 100 exclusion limits on spin-independent direct
detection cross-section. We obtain the required cross-section of
$10^{-27}cm^3s^{-1}$ for the 130 GeV $\gamma$-ray flux through the resonant
annihilation of dark matter via pseudoscalar triplet Higgs of mass $\sim$260
GeV. The dark matter is predominantly bino-higgsino which has large couplings
with photons (through higgsino) and gives correct relic density (through bino).
We get the enhanced Higgs diphoton decay rate, $R_{\gamma \gamma}\simeq 1.24$
dominantly contributed by the light chargino-loops, which can account for the
reported excess seen in the $h\rightarrow \gamma \gamma$ channel by ATLAS.
|
[
{
"created": "Thu, 25 Apr 2013 10:04:06 GMT",
"version": "v1"
},
{
"created": "Sun, 7 Jul 2013 16:08:15 GMT",
"version": "v2"
}
] |
2015-06-15
|
[
[
"Basak",
"Tanushree",
""
],
[
"Mohanty",
"Subhendra",
""
]
] |
We propose an economic extension of minimal supersymmetric standard model with a SU(2) singlet and Y=0 triplet, which can explain (i) the 125 GeV Higgs boson without fine tuning, (ii) the 130 GeV $\gamma$-ray line seen at Fermi-LAT, (as well as a second photon line at 114 GeV)(iii) an enhanced Higgs di-photon decay rate seen by ATLAS, while being consistent with dark matter relic density and recent XENON 100 exclusion limits on spin-independent direct detection cross-section. We obtain the required cross-section of $10^{-27}cm^3s^{-1}$ for the 130 GeV $\gamma$-ray flux through the resonant annihilation of dark matter via pseudoscalar triplet Higgs of mass $\sim$260 GeV. The dark matter is predominantly bino-higgsino which has large couplings with photons (through higgsino) and gives correct relic density (through bino). We get the enhanced Higgs diphoton decay rate, $R_{\gamma \gamma}\simeq 1.24$ dominantly contributed by the light chargino-loops, which can account for the reported excess seen in the $h\rightarrow \gamma \gamma$ channel by ATLAS.
|
hep-ph/9308356
|
Qiping Xu
|
Q. P. Xu and A. N. Kamal
|
Chiral symmetry and many-body nonleptonic decays of bottom hadrons
|
6 pages, latex, figures included. Talk presented at the 5th
International Symposium on Heavy Flavour Physics, Montreal, Canada, July
6-10, 1993
| null | null |
Alberta Thy-39-93
|
hep-ph
| null |
Chiral symmetry can be applied to many-body nonleptonic decays of heavy
hadrons. We establish the chiral effective Hamiltonian for some typical
many-body nonleptonic decays of bottom hadrons. We discuss the lowest-order
contributions coming from such a Hamiltonian and present, as an example, a
calculation of decay distributions of $B^-\to D^+ D^-_s \pi^-$ and $B^-\to
D^{\ast +} D^-_s \pi^-$. We emphasize that wide applications of this method are
possible.
|
[
{
"created": "Sat, 28 Aug 1993 19:44:58 GMT",
"version": "v1"
}
] |
2007-05-23
|
[
[
"Xu",
"Q. P.",
""
],
[
"Kamal",
"A. N.",
""
]
] |
Chiral symmetry can be applied to many-body nonleptonic decays of heavy hadrons. We establish the chiral effective Hamiltonian for some typical many-body nonleptonic decays of bottom hadrons. We discuss the lowest-order contributions coming from such a Hamiltonian and present, as an example, a calculation of decay distributions of $B^-\to D^+ D^-_s \pi^-$ and $B^-\to D^{\ast +} D^-_s \pi^-$. We emphasize that wide applications of this method are possible.
|
2005.07737
|
Celso de Camargo Barros Jr.
|
Marcelo G. L. Nogueira-Santos, Celso C. Barros Jr
|
Low energy pion-$\Lambda_b$ interaction
|
8 pages, 7 figures
| null |
10.1140/epjc/s10052-020-8151-z
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
In this work we study the low energy pion-$\Lambda_b$ interaction considering
effecective chiral Lagrangians that include pions, baryons and the
corresponding resonances. Interactions mediated by a $\sigma$ meson exchange
are also considered. The scattering amplitudes are calculated and then we
determine the angular distributions and polarizations.
|
[
{
"created": "Fri, 15 May 2020 18:44:28 GMT",
"version": "v1"
}
] |
2020-07-15
|
[
[
"Nogueira-Santos",
"Marcelo G. L.",
""
],
[
"Barros",
"Celso C.",
"Jr"
]
] |
In this work we study the low energy pion-$\Lambda_b$ interaction considering effecective chiral Lagrangians that include pions, baryons and the corresponding resonances. Interactions mediated by a $\sigma$ meson exchange are also considered. The scattering amplitudes are calculated and then we determine the angular distributions and polarizations.
|
hep-ph/0610351
|
Ivo de Medeiros Varzielas
|
I. de Medeiros Varzielas
|
Neutrino tri-bi-maximal mixing from Delta(27)
|
to appear in Proceedings of SUSY06, the 14th International Conference
on Supersymmetry and the Unification of Fundamental Interactions, UC Irvine,
California, 12-17 June 2006
|
AIPConf.Proc.903:397-400,2007
|
10.1063/1.2735208
| null |
hep-ph
| null |
The observed neutrino mixing, having a near maximal atmospheric neutrino
mixing angle and a large solar mixing angle, is close to tri-bi-maximal,
putting leptonic mixing in contrast with the small mixing of the quark sector.
We discuss a model in which Delta(27) (a subgroup of SU(3)) is the family
symmetry, and tri-bi-maximal mixing directly follows from the vacuum structure
enforced by the discrete symmetry. The model accounts for the observed quark
and lepton masses and the CKM matrix, as well as being consistent with an
underlying stage of Grand Unification.
|
[
{
"created": "Thu, 26 Oct 2006 09:23:21 GMT",
"version": "v1"
}
] |
2008-11-26
|
[
[
"Varzielas",
"I. de Medeiros",
""
]
] |
The observed neutrino mixing, having a near maximal atmospheric neutrino mixing angle and a large solar mixing angle, is close to tri-bi-maximal, putting leptonic mixing in contrast with the small mixing of the quark sector. We discuss a model in which Delta(27) (a subgroup of SU(3)) is the family symmetry, and tri-bi-maximal mixing directly follows from the vacuum structure enforced by the discrete symmetry. The model accounts for the observed quark and lepton masses and the CKM matrix, as well as being consistent with an underlying stage of Grand Unification.
|
1106.5927
|
Zhen-hua Zhao
|
Chun Liu, Jin-tao Tian, Zhen-hua Zhao
|
MINOS Anomaly as A Signal of Lorentz Violation
|
9 pages, 4 figures, references added, accepted for publication in PLB
|
Phys.Lett.B702:154-157,2011
|
10.1016/j.physletb.2011.06.084
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Recently, the MINOS collaboration reported an anomaly that the mass-squared
difference and mixing angle of $\bar{\nu}_\mu$ $\leftrightarrow$
$\bar{\nu}_\tau$ are both different from that of $\nu_\mu$ $\leftrightarrow$
$\nu_\tau$. In this paper, based on the framework of neutrino oscillations,
terms that break the Lorentz symmetry are used as perturbation to explain this
anomaly and satisfactory results are got. Remarkably, some surprising
conclusions, one of which is that in the high energy limit (hundreds of GeV)
neutrino oscillation pattern will be independent of energy, are also arrived.
|
[
{
"created": "Wed, 29 Jun 2011 12:56:16 GMT",
"version": "v1"
},
{
"created": "Tue, 5 Jul 2011 14:56:29 GMT",
"version": "v2"
}
] |
2011-07-25
|
[
[
"Liu",
"Chun",
""
],
[
"Tian",
"Jin-tao",
""
],
[
"Zhao",
"Zhen-hua",
""
]
] |
Recently, the MINOS collaboration reported an anomaly that the mass-squared difference and mixing angle of $\bar{\nu}_\mu$ $\leftrightarrow$ $\bar{\nu}_\tau$ are both different from that of $\nu_\mu$ $\leftrightarrow$ $\nu_\tau$. In this paper, based on the framework of neutrino oscillations, terms that break the Lorentz symmetry are used as perturbation to explain this anomaly and satisfactory results are got. Remarkably, some surprising conclusions, one of which is that in the high energy limit (hundreds of GeV) neutrino oscillation pattern will be independent of energy, are also arrived.
|
hep-ph/9307252
| null |
R. Alemany, J.J. Gomez-Cadenas, M.C. Gonzalez-Garcia and J.W.F. Valle
|
Searching for Exotic Tau Decays
|
CERN-PPE/93-49, MAD/PH/741, FTUV/92-588. 29 Pages in REVTeX. 13
Figures available upon request
| null | null | null |
hep-ph
| null |
We discuss the potential of $\tau$-charm and B factories for the search of
new physics through the study of rare $\tau$ decays. We consider decays that
involve the violation of lepton flavour conservation. Such decays bear a close
relationship to the physics of neutrino mass and the properties of the lepton
sector of the electroweak theory.
|
[
{
"created": "Mon, 12 Jul 1993 15:55:00 GMT",
"version": "v1"
}
] |
2007-05-23
|
[
[
"Alemany",
"R.",
""
],
[
"Gomez-Cadenas",
"J. J.",
""
],
[
"Gonzalez-Garcia",
"M. C.",
""
],
[
"Valle",
"J. W. F.",
""
]
] |
We discuss the potential of $\tau$-charm and B factories for the search of new physics through the study of rare $\tau$ decays. We consider decays that involve the violation of lepton flavour conservation. Such decays bear a close relationship to the physics of neutrino mass and the properties of the lepton sector of the electroweak theory.
|
1202.5592
|
Lei Guo
|
Li Xiao-Peng, Guo Lei, Ma Wen-Gan, Han Liang, Zhang Ren-You, and Wang
Shao-Ming
|
Single slepton production associated with a top quark at LHC in NLO QCD
|
33 pages, 18 figures, published version of EPJC
|
Eur. Phys. J. C (2012) 72:1918
|
10.1140/epjc/s10052-012-1918-0
| null |
hep-ph hep-ex
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Single slepton production in association with a top quark at the CERN Large
Hadron Collider (LHC) is one of the important processes in probing the R-parity
violation couplings. We calculate the QCD next-to-leading order (NLO)
corrections to the $pp \to t\slep^{-}(\bar{t}\slep^{+})+X$ process at the LHC
and discuss the impacts of the QCD corrections on kinematic distributions. We
investigate the dependence of the leading order (LO) and the NLO QCD corrected
integrated cross section on the factorization/renormalization energy scale,
slepton, stop-quark and gluino masses. We find that the uncertainty of the LO
cross section due to the energy scale is obviously improved by the NLO QCD
corrections, and the exclusive jet event selection scheme keeps the convergence
of the perturbative series better than the inclusive scheme. The results show
that the polarization asymmetry of the top-quark will be reduced by the NLO QCD
corrections, and the QCD corrections generally increase with the increment of
the $\tilde{t}_1$ or $\tilde{g}$ mass value.
|
[
{
"created": "Sat, 25 Feb 2012 00:44:12 GMT",
"version": "v1"
},
{
"created": "Fri, 9 Mar 2012 06:40:23 GMT",
"version": "v2"
}
] |
2012-03-29
|
[
[
"Xiao-Peng",
"Li",
""
],
[
"Lei",
"Guo",
""
],
[
"Wen-Gan",
"Ma",
""
],
[
"Liang",
"Han",
""
],
[
"Ren-You",
"Zhang",
""
],
[
"Shao-Ming",
"Wang",
""
]
] |
Single slepton production in association with a top quark at the CERN Large Hadron Collider (LHC) is one of the important processes in probing the R-parity violation couplings. We calculate the QCD next-to-leading order (NLO) corrections to the $pp \to t\slep^{-}(\bar{t}\slep^{+})+X$ process at the LHC and discuss the impacts of the QCD corrections on kinematic distributions. We investigate the dependence of the leading order (LO) and the NLO QCD corrected integrated cross section on the factorization/renormalization energy scale, slepton, stop-quark and gluino masses. We find that the uncertainty of the LO cross section due to the energy scale is obviously improved by the NLO QCD corrections, and the exclusive jet event selection scheme keeps the convergence of the perturbative series better than the inclusive scheme. The results show that the polarization asymmetry of the top-quark will be reduced by the NLO QCD corrections, and the QCD corrections generally increase with the increment of the $\tilde{t}_1$ or $\tilde{g}$ mass value.
|
1102.2340
|
Encieh Erfani
|
Manuel Drees and Encieh Erfani
|
Running-Mass Inflation Model and Primordial Black Holes
|
22 pages, 6 figures, Refs. added, Published in JCAP
|
JCAP 1104:005,2011
|
10.1088/1475-7516/2011/04/005
| null |
hep-ph astro-ph.CO
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We revisit the question whether the running-mass inflation model allows the
formation of Primordial Black Holes (PBHs) that are sufficiently long-lived to
serve as candidates for Dark Matter. We incorporate recent cosmological data,
including the WMAP 7-year results. Moreover, we include "the running of the
running" of the spectral index of the power spectrum, as well as the
renormalization group "running of the running" of the inflaton mass term. Our
analysis indicates that formation of sufficiently heavy, and hence long-lived,
PBHs still remains possible in this scenario. As a by-product, we show that the
additional term in the inflaton potential still does not allow significant
negative running of the spectral index.
|
[
{
"created": "Fri, 11 Feb 2011 12:57:44 GMT",
"version": "v1"
},
{
"created": "Mon, 4 Apr 2011 08:12:43 GMT",
"version": "v2"
},
{
"created": "Fri, 8 Apr 2011 08:04:25 GMT",
"version": "v3"
}
] |
2015-03-18
|
[
[
"Drees",
"Manuel",
""
],
[
"Erfani",
"Encieh",
""
]
] |
We revisit the question whether the running-mass inflation model allows the formation of Primordial Black Holes (PBHs) that are sufficiently long-lived to serve as candidates for Dark Matter. We incorporate recent cosmological data, including the WMAP 7-year results. Moreover, we include "the running of the running" of the spectral index of the power spectrum, as well as the renormalization group "running of the running" of the inflaton mass term. Our analysis indicates that formation of sufficiently heavy, and hence long-lived, PBHs still remains possible in this scenario. As a by-product, we show that the additional term in the inflaton potential still does not allow significant negative running of the spectral index.
|
hep-ph/9801348
|
Gomez Mario
|
M.E. Gomez and K. Tamvakis
|
A Note On R-Parity Violation and Fermion Masses
|
8 pages, uses LaTeX2e
|
Phys. Rev. D 58, 057701 (1998)
|
10.1103/PhysRevD.58.057701
| null |
hep-ph
| null |
We consider a class of supersymmetric SU(3)\times SU(2)\times U(1) multihiggs
models in which R-parity is violated through bilinear Higgs-lepton
interactions. The required, due to R-parity violation, higgs-lepton rotations
introduce an alternative way to generate the phenomenologically desirable
fermion mass matrix structures independently of the equality of Yukawas,
possibly imposed by superstring or other unification.
|
[
{
"created": "Mon, 19 Jan 1998 18:08:32 GMT",
"version": "v1"
}
] |
2016-08-25
|
[
[
"Gomez",
"M. E.",
""
],
[
"Tamvakis",
"K.",
""
]
] |
We consider a class of supersymmetric SU(3)\times SU(2)\times U(1) multihiggs models in which R-parity is violated through bilinear Higgs-lepton interactions. The required, due to R-parity violation, higgs-lepton rotations introduce an alternative way to generate the phenomenologically desirable fermion mass matrix structures independently of the equality of Yukawas, possibly imposed by superstring or other unification.
|
hep-ph/0504258
|
Torleif E. O. Ericson
|
T. E. O. Ericson (CERN)
|
Isospin Violation in Pion-Nucleon Scattering at Threshold
|
10 pages, 1 eps figure. Invited talk to appear in Proceedings of
EXA05, Vienna, Feb. 21-25 2005, Verlag der oesterreichischen Akademie des
Wissenschaften
| null | null |
CERN-PH-TH/2005-075
|
hep-ph
| null |
We discuss the electromagnetic corrections to the pion-nucleon scattering
lengths generated by minimal e. m. coupling from a knowledge of the low energy
expansion of the pion-nucleon elastic scattering amplitude as well as from the
nucleon and delta pole terms, all a consequence of purely strong interactions.
We assume the heavy baryon limit; the e.m. and axial form factors and the
masses are used with their empirical values, such that there is no free
parameter. The different terms have a clear physical and intuitive origin. In
particular, a large isospin breaking contribution to the isoscalar term appears
for the elastic charged-pion scattering lengths. We attempt a comparison to the
results from chiral effective field theory (EFT) with a physical interpretation
of the empirical constants in that approach. The results are applied to the
energy shift and width of pionic hydrogen.
|
[
{
"created": "Wed, 27 Apr 2005 13:44:38 GMT",
"version": "v1"
}
] |
2007-05-23
|
[
[
"Ericson",
"T. E. O.",
"",
"CERN"
]
] |
We discuss the electromagnetic corrections to the pion-nucleon scattering lengths generated by minimal e. m. coupling from a knowledge of the low energy expansion of the pion-nucleon elastic scattering amplitude as well as from the nucleon and delta pole terms, all a consequence of purely strong interactions. We assume the heavy baryon limit; the e.m. and axial form factors and the masses are used with their empirical values, such that there is no free parameter. The different terms have a clear physical and intuitive origin. In particular, a large isospin breaking contribution to the isoscalar term appears for the elastic charged-pion scattering lengths. We attempt a comparison to the results from chiral effective field theory (EFT) with a physical interpretation of the empirical constants in that approach. The results are applied to the energy shift and width of pionic hydrogen.
|
hep-ph/0004160
|
Gabriela Barenboim
|
G. Barenboim and F. Scheck (Mainz)
|
Tau neutrinos from muon storage rings
|
11 pages, 5 postscript figures (eps)
|
Phys.Lett.B485:171-177,2000
|
10.1016/S0370-2693(00)00708-5
| null |
hep-ph
| null |
Charged tau leptons emerging in a long baseline experiment with a muon
storage ring and a far-away detector will positively establish neutrino
oscillations. We study the conversion of $\nu_\mu$ ($\bar{\nu}_\mu$) and of
$\bar{\nu}_e$ ($\nu_e$) to $\nu_\tau$ or $\bar{\nu}_\tau$ for neutrinos from a
20 GeV muon storage ring, within the strong mixing scheme and on the basis of
the squared mass differences which are compatible with all reported neutrino
anomalies, including the LSND data. In contrast to other solutions which ignore
the Los Alamos anomaly, we find charged tau production rates which should be
measurable in a realistic set up. As a consequence, determining the complete
mass spectrum of neutrinos as well as all three mixing angles seems within
reach. Matter effects are discussed thoroughly but are found to be small in
this situation.
|
[
{
"created": "Mon, 17 Apr 2000 11:00:00 GMT",
"version": "v1"
}
] |
2014-11-17
|
[
[
"Barenboim",
"G.",
"",
"Mainz"
],
[
"Scheck",
"F.",
"",
"Mainz"
]
] |
Charged tau leptons emerging in a long baseline experiment with a muon storage ring and a far-away detector will positively establish neutrino oscillations. We study the conversion of $\nu_\mu$ ($\bar{\nu}_\mu$) and of $\bar{\nu}_e$ ($\nu_e$) to $\nu_\tau$ or $\bar{\nu}_\tau$ for neutrinos from a 20 GeV muon storage ring, within the strong mixing scheme and on the basis of the squared mass differences which are compatible with all reported neutrino anomalies, including the LSND data. In contrast to other solutions which ignore the Los Alamos anomaly, we find charged tau production rates which should be measurable in a realistic set up. As a consequence, determining the complete mass spectrum of neutrinos as well as all three mixing angles seems within reach. Matter effects are discussed thoroughly but are found to be small in this situation.
|
0911.0734
|
Yu-Kuo Hsiao
|
Kingman Cheung, Cheng-Wei Chiang, Yu-Kuo Hsiao, and Tzu-Chiang Yuan
|
Longitudinal Weak Gauge Bosons Scattering in Hidden Z' Models
|
18 pages, 4 figures, and 2 tables, version to appear in PRD
|
Phys.Rev.D81:053001,2010
|
10.1103/PhysRevD.81.053001
| null |
hep-ph hep-ex
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Longitudinal weak gauge boson scattering has been well known as a powerful
method to probe the underlying mechanism of the electroweak symmetry breaking
sector of the Standard Model. We point out that longitudinal weak gauge boson
scattering is also sensitive to the gauge sector when the non-Abelian trilinear
and quartic couplings of the Standard Model Z boson are modified due to the
general mixings with another Z' boson in the hidden sector and possibly with
the photon as well. In particular, these mixings can lead to a partially strong
scattering effect in the channels of W^\pm_L W^\pm_L \to W^\pm_L W^\pm_L and
W^\pm_L W^\mp_L \to W^\pm_L W^\mp_L which can be probed at the Large Hadron
Collider. We study this effect in a simple U(1) extension of the Standard Model
recently suggested in the literature that includes both the symmetry breaking
Higgs mechanism as well as the gauge invariant Stueckelberg mass terms for the
two Abelian groups. Other types of Z' models are also briefly discussed.
|
[
{
"created": "Wed, 4 Nov 2009 05:49:42 GMT",
"version": "v1"
},
{
"created": "Wed, 18 Nov 2009 06:51:28 GMT",
"version": "v2"
},
{
"created": "Tue, 2 Mar 2010 09:07:37 GMT",
"version": "v3"
}
] |
2010-04-06
|
[
[
"Cheung",
"Kingman",
""
],
[
"Chiang",
"Cheng-Wei",
""
],
[
"Hsiao",
"Yu-Kuo",
""
],
[
"Yuan",
"Tzu-Chiang",
""
]
] |
Longitudinal weak gauge boson scattering has been well known as a powerful method to probe the underlying mechanism of the electroweak symmetry breaking sector of the Standard Model. We point out that longitudinal weak gauge boson scattering is also sensitive to the gauge sector when the non-Abelian trilinear and quartic couplings of the Standard Model Z boson are modified due to the general mixings with another Z' boson in the hidden sector and possibly with the photon as well. In particular, these mixings can lead to a partially strong scattering effect in the channels of W^\pm_L W^\pm_L \to W^\pm_L W^\pm_L and W^\pm_L W^\mp_L \to W^\pm_L W^\mp_L which can be probed at the Large Hadron Collider. We study this effect in a simple U(1) extension of the Standard Model recently suggested in the literature that includes both the symmetry breaking Higgs mechanism as well as the gauge invariant Stueckelberg mass terms for the two Abelian groups. Other types of Z' models are also briefly discussed.
|
2009.05779
|
Andrew Akeroyd
|
A.G. Akeroyd, Stefano Moretti, Tetsuo Shindou, Muyuan Song
|
CP asymmetries of ${\overline B}\to X_s/X_d\gamma$ in models with three
Higgs doublets
|
25 pages, 14 figures
|
Phys. Rev. D 103, 015035 (2021)
|
10.1103/PhysRevD.103.015035
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Direct CP asymmetries (${\cal A}_{CP}$) in the inclusive decays of
${\overline B}\to X_s\gamma$ and ${\overline B}\to X_{s+d}\gamma$ of the order
of $1\%$ will be probed at the BELLE II experiment. In this work, three such
asymmetries are studied in the context of a three-Higgs-doublet model (3HDM),
and it is shown that all three ${\cal A}_{CP}$ can be as large as the current
experimental limits. Of particular interest is ${\cal A}_{CP}$ for ${\overline
B}\to X_{s+d}\gamma$, which is predicted to be effectively zero in the Standard
Model (SM). A measurement of $2.5\%$ or more for this observable with the full
BELLE II data would give $5\sigma$ evidence for physics beyond the SM. We
display parameter space in the 3HDM for which such a clear signal is possible.
|
[
{
"created": "Sat, 12 Sep 2020 12:34:14 GMT",
"version": "v1"
}
] |
2021-02-03
|
[
[
"Akeroyd",
"A. G.",
""
],
[
"Moretti",
"Stefano",
""
],
[
"Shindou",
"Tetsuo",
""
],
[
"Song",
"Muyuan",
""
]
] |
Direct CP asymmetries (${\cal A}_{CP}$) in the inclusive decays of ${\overline B}\to X_s\gamma$ and ${\overline B}\to X_{s+d}\gamma$ of the order of $1\%$ will be probed at the BELLE II experiment. In this work, three such asymmetries are studied in the context of a three-Higgs-doublet model (3HDM), and it is shown that all three ${\cal A}_{CP}$ can be as large as the current experimental limits. Of particular interest is ${\cal A}_{CP}$ for ${\overline B}\to X_{s+d}\gamma$, which is predicted to be effectively zero in the Standard Model (SM). A measurement of $2.5\%$ or more for this observable with the full BELLE II data would give $5\sigma$ evidence for physics beyond the SM. We display parameter space in the 3HDM for which such a clear signal is possible.
|
1404.7510
|
Howard Baer
|
Howard Baer, Vernon Barger, Dan Mickelson, Azar Mustafayev and Xerxes
Tata
|
Physics at a Higgsino Factory
|
28 pages
| null |
10.1007/JHEP06(2014)172
|
UH-511-1234-14
|
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Naturalness arguments applied to supersymmetric theories imply a spectrum
containing four light higgsinos \tz_{1,2} and \tw_1^+- with masses ~ 100-300
GeV (the closer to M_Z the more natural). The compressed mass spectrum and
associated low energy release from \tw_1 and \tz_2 three-body decay makes
higgsinos difficult to detect at LHC14, while the other sparticles might be
heavy, and possibly even beyond LHC14 reach. In contrast, the International
Linear e^+e^- Collider (ILC) with \sqrt{s}>2m(higgsino) would be a {\it
higgsino factory} in addition to a Higgs boson factory and would serve as a
discovery machine for natural SUSY! In this case, both chargino and neutralino
production %which give rise to distinct event topologies, occur at comparable
rates, and lead to observable signals above SM backgrounds. We examine two
benchmark cases, one just beyond the LHC8 reach with \tw_1(\tz_2)-\tz_1 mass
gap of 15 (21) GeV, and a second more difficult case beyond even the LHC14
reach, where the mass gap is just 10 GeV, close to its minimum in models with
no worse than 3% fine-tuning. The signal is characterized by low visible energy
events together with MET in the one or two jets +1\ell channel from chargino
production, and in the opposite sign, same-flavour, acoplanar dilepton channel
from \tz_1\tz_2 production. For both cases, we find that the signal is
observable above backgrounds from the usual 2-> 2 SM events and from
\gamma\gamma collisions with just a few fb^{-1} of integrated luminosity. We
also show that with an integrated luminosity of 100~fb^{-1}, it should be
possible to extract \tw_1, \tz_2 and \tz_1 masses to percent level. These
measurements would point to higgsinos as the origin of new physics and strongly
suggest a link to a natural origin for W, Z and h masses.
|
[
{
"created": "Tue, 29 Apr 2014 20:02:15 GMT",
"version": "v1"
}
] |
2015-06-19
|
[
[
"Baer",
"Howard",
""
],
[
"Barger",
"Vernon",
""
],
[
"Mickelson",
"Dan",
""
],
[
"Mustafayev",
"Azar",
""
],
[
"Tata",
"Xerxes",
""
]
] |
Naturalness arguments applied to supersymmetric theories imply a spectrum containing four light higgsinos \tz_{1,2} and \tw_1^+- with masses ~ 100-300 GeV (the closer to M_Z the more natural). The compressed mass spectrum and associated low energy release from \tw_1 and \tz_2 three-body decay makes higgsinos difficult to detect at LHC14, while the other sparticles might be heavy, and possibly even beyond LHC14 reach. In contrast, the International Linear e^+e^- Collider (ILC) with \sqrt{s}>2m(higgsino) would be a {\it higgsino factory} in addition to a Higgs boson factory and would serve as a discovery machine for natural SUSY! In this case, both chargino and neutralino production %which give rise to distinct event topologies, occur at comparable rates, and lead to observable signals above SM backgrounds. We examine two benchmark cases, one just beyond the LHC8 reach with \tw_1(\tz_2)-\tz_1 mass gap of 15 (21) GeV, and a second more difficult case beyond even the LHC14 reach, where the mass gap is just 10 GeV, close to its minimum in models with no worse than 3% fine-tuning. The signal is characterized by low visible energy events together with MET in the one or two jets +1\ell channel from chargino production, and in the opposite sign, same-flavour, acoplanar dilepton channel from \tz_1\tz_2 production. For both cases, we find that the signal is observable above backgrounds from the usual 2-> 2 SM events and from \gamma\gamma collisions with just a few fb^{-1} of integrated luminosity. We also show that with an integrated luminosity of 100~fb^{-1}, it should be possible to extract \tw_1, \tz_2 and \tz_1 masses to percent level. These measurements would point to higgsinos as the origin of new physics and strongly suggest a link to a natural origin for W, Z and h masses.
|
hep-ph/9805414
|
David Miller
|
D. J. Miller (RAL) and Michael H. Seymour (RAL)
|
Secondary Heavy Quark Pair Production in e+e- Annihilation
|
11 pages, 4 postscript figures
|
Phys.Lett.B435:213-220,1998
|
10.1016/S0370-2693(98)00773-4
|
RAL-TR-98-042
|
hep-ph
| null |
The multiplicity of heavy quarks from gluon splitting in e+e- annihilation
has now been theoretically calculated and experimentally measured at LEP.
However, the experimental measurement requires theoretical input for the shape
of the multiplicity with respect to an event shape. In this paper we calculate
the multiplicity of heavy quarks from gluon splitting in e+e- annihilation as a
function of the heavy jet mass of the event, to next-to-leading logarithmic
accuracy. We compare our result with Monte Carlo predictions.
|
[
{
"created": "Thu, 21 May 1998 16:41:59 GMT",
"version": "v1"
}
] |
2009-04-13
|
[
[
"Miller",
"D. J.",
"",
"RAL"
],
[
"Seymour",
"Michael H.",
"",
"RAL"
]
] |
The multiplicity of heavy quarks from gluon splitting in e+e- annihilation has now been theoretically calculated and experimentally measured at LEP. However, the experimental measurement requires theoretical input for the shape of the multiplicity with respect to an event shape. In this paper we calculate the multiplicity of heavy quarks from gluon splitting in e+e- annihilation as a function of the heavy jet mass of the event, to next-to-leading logarithmic accuracy. We compare our result with Monte Carlo predictions.
|
2009.13547
|
Subhasis Samanta
|
Subhasis Samanta and Francesco Giacosa
|
QFT treatment of a bound state in a thermal gas
|
Accepted for publication in Physical Review D
|
Phys. Rev. D 102, 116023 (2020)
|
10.1103/PhysRevD.102.116023
| null |
hep-ph hep-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We investigate how to include bound states in a thermal gas in the context of
quantum field theory (QFT). To this end, we use for definiteness a scalar QFT
with a $\varphi^{4}$ interaction, where the field $\varphi$ represents a
particle with mass $m$. A bound state of the $\varphi$-$\varphi$ type is
created when the coupling constant is negative and its modulus is larger than a
certain critical value. We investigate the contribution of this bound state to
the pressure of the thermal gas of the system by using the $S$-matrix formalism
involving the derivative of the phase-shift scattering. Our analysis, which is
based on an unitarized one-loop resumed approach which renders the theory
finite and well-defined for each value of the coupling constant, leads to
following main results: (i) We generalize the phase-shift formula in order to
take into account within a unique formal approach the two-particle interaction
as well as the bound state (if existent). (ii) \textit{On the one hand}, the
number density of the bound state in the system at a certain temperature $T$ is
obtained by the standard thermal integral; this is the case for any binding
energy, even if it is much smaller than the temperature of the thermal gas.
(iii) \textit{On the other hand}, the contribution of the bound state to the
total pressure is partly -- but not completely -- canceled by the two-particle
interaction contribution to the pressure. (iv) The pressure as function of the
coupling constant is \textit{continuous} also at the critical coupling for the
bound state formation: the jump in pressure due to the sudden appearance of the
bound state is exactly canceled by an analogous jump (but with opposite sign)
of the interaction contribution to the pressure.
|
[
{
"created": "Mon, 28 Sep 2020 18:00:23 GMT",
"version": "v1"
},
{
"created": "Wed, 16 Dec 2020 13:49:39 GMT",
"version": "v2"
}
] |
2021-01-01
|
[
[
"Samanta",
"Subhasis",
""
],
[
"Giacosa",
"Francesco",
""
]
] |
We investigate how to include bound states in a thermal gas in the context of quantum field theory (QFT). To this end, we use for definiteness a scalar QFT with a $\varphi^{4}$ interaction, where the field $\varphi$ represents a particle with mass $m$. A bound state of the $\varphi$-$\varphi$ type is created when the coupling constant is negative and its modulus is larger than a certain critical value. We investigate the contribution of this bound state to the pressure of the thermal gas of the system by using the $S$-matrix formalism involving the derivative of the phase-shift scattering. Our analysis, which is based on an unitarized one-loop resumed approach which renders the theory finite and well-defined for each value of the coupling constant, leads to following main results: (i) We generalize the phase-shift formula in order to take into account within a unique formal approach the two-particle interaction as well as the bound state (if existent). (ii) \textit{On the one hand}, the number density of the bound state in the system at a certain temperature $T$ is obtained by the standard thermal integral; this is the case for any binding energy, even if it is much smaller than the temperature of the thermal gas. (iii) \textit{On the other hand}, the contribution of the bound state to the total pressure is partly -- but not completely -- canceled by the two-particle interaction contribution to the pressure. (iv) The pressure as function of the coupling constant is \textit{continuous} also at the critical coupling for the bound state formation: the jump in pressure due to the sudden appearance of the bound state is exactly canceled by an analogous jump (but with opposite sign) of the interaction contribution to the pressure.
|
hep-ph/9209263
|
Jim Amundson
|
James F. Amundson and Jonathan L. Rosner
|
Heavy Quark Symmetry Violation in Semileptonic Decays of D Mesons
|
25 pages (LaTeX) + 7 pages of Postscript figures (included at end),
EFI-92-36
|
Phys.Rev. D47 (1993) 1951-1963
|
10.1103/PhysRevD.47.1951
| null |
hep-ph
| null |
The decays of $D$ mesons to $K l \nu$ and $K^* l \nu$ final states exhibit
significant deviations from the predictions of heavy-quark symmetry, as one
might expect since the strange quark's mass is of the same order as the QCD
scale. Nonetheless, in order to understand where the most significant effects
might lie for heavier systems (such as $B \to D l\nu$ and $B \to D^* l\nu$),
the pattern of these deviations is analyzed from the standpoint of perturbative
QCD and ${\cal O}(1/m_s)$ corrections. Two main effects are noted. First, the
perturbative QCD corrections lead to an overall decrease of predicted rates,
which can be understood in terms of production of excited kaonic states.
Second, ${\cal O}(1/m_s)$ effects tend to cancel the perturbative QCD
corrections in the case of $Kl\nu$ decay, while they have minimal effect in
$K^*l\nu$ decay.
|
[
{
"created": "Tue, 22 Sep 1992 03:28:23 GMT",
"version": "v1"
}
] |
2009-10-22
|
[
[
"Amundson",
"James F.",
""
],
[
"Rosner",
"Jonathan L.",
""
]
] |
The decays of $D$ mesons to $K l \nu$ and $K^* l \nu$ final states exhibit significant deviations from the predictions of heavy-quark symmetry, as one might expect since the strange quark's mass is of the same order as the QCD scale. Nonetheless, in order to understand where the most significant effects might lie for heavier systems (such as $B \to D l\nu$ and $B \to D^* l\nu$), the pattern of these deviations is analyzed from the standpoint of perturbative QCD and ${\cal O}(1/m_s)$ corrections. Two main effects are noted. First, the perturbative QCD corrections lead to an overall decrease of predicted rates, which can be understood in terms of production of excited kaonic states. Second, ${\cal O}(1/m_s)$ effects tend to cancel the perturbative QCD corrections in the case of $Kl\nu$ decay, while they have minimal effect in $K^*l\nu$ decay.
|
1109.6293
|
Bowen Xiao
|
Fabio Dominguez, Jian-Wei Qiu, Bo-Wen Xiao, Feng Yuan
|
On the linearly polarized gluon distributions in the color dipole model
|
10 pages,v2 with minor revision
| null |
10.1103/PhysRevD.85.045003
| null |
hep-ph nucl-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We show that the linearly polarized gluon distributions appear in the color
dipole model as we derive the full cross sections of the DIS dijet production
and the Drell-Yan dijet ($\gamma^*$ jet correlation) process. Together with the
normal Weizs\"acker-Williams gluon distribution, the linearly polarized one
will contribute to the DIS dijet production cross section as the coefficient of
the $\cos(2 \Delta \phi) $ term in the correlation limit. We also derive the
exact results for the cross section of the Drell-Yan dijet process, and find
that the linearly polarized dipole gluon distribution which is identical to the
normal dipole gluon distribution involves in the cross section. The results
obtained in this paper agree with the previous transverse momentum dependent
factorization study. We further derive the small-$x$ evolution of these
linearly polarized gluon distributions and find that they rise as $x$ gets
small at high energy.
|
[
{
"created": "Wed, 28 Sep 2011 18:48:07 GMT",
"version": "v1"
},
{
"created": "Tue, 31 Jan 2012 01:36:45 GMT",
"version": "v2"
}
] |
2015-05-30
|
[
[
"Dominguez",
"Fabio",
""
],
[
"Qiu",
"Jian-Wei",
""
],
[
"Xiao",
"Bo-Wen",
""
],
[
"Yuan",
"Feng",
""
]
] |
We show that the linearly polarized gluon distributions appear in the color dipole model as we derive the full cross sections of the DIS dijet production and the Drell-Yan dijet ($\gamma^*$ jet correlation) process. Together with the normal Weizs\"acker-Williams gluon distribution, the linearly polarized one will contribute to the DIS dijet production cross section as the coefficient of the $\cos(2 \Delta \phi) $ term in the correlation limit. We also derive the exact results for the cross section of the Drell-Yan dijet process, and find that the linearly polarized dipole gluon distribution which is identical to the normal dipole gluon distribution involves in the cross section. The results obtained in this paper agree with the previous transverse momentum dependent factorization study. We further derive the small-$x$ evolution of these linearly polarized gluon distributions and find that they rise as $x$ gets small at high energy.
|
hep-ph/9405370
|
Leonid Burakovsky
|
L. Burakovsky and L.P. Horwitz
|
Relativistic mass distribution in event-anti-event system and
``realistic'' equation of state for hot hadronic matter
|
19 pages, report TAUP-2161-94
|
Found.Phys. 25 (1995) 1127-1146
|
10.1007/BF02055255
| null |
hep-ph hep-th
| null |
We find the equation of state $p,\rho \propto T^6,$ which gives the value of
the sound velocity $c^2=0.20,$ in agreement with the ``realistic'' equation of
state for hot hadronic matter suggested by Shuryak, in the framework of a
covariant relativistic statistical mechanics of an event--anti-event system
with small chemical and mass potentials. The relativistic mass distribution for
such a system is obtained and shown to be a good candidate for fitting hadronic
resonances, in agreement with the phenomenological models of Hagedorn, Shuryak,
{\it et al.} This distribution provides a correction to the value of specific
heat 3/2, of the order of 5.5\%, at low temperatures.
|
[
{
"created": "Tue, 24 May 1994 11:35:15 GMT",
"version": "v1"
}
] |
2009-10-28
|
[
[
"Burakovsky",
"L.",
""
],
[
"Horwitz",
"L. P.",
""
]
] |
We find the equation of state $p,\rho \propto T^6,$ which gives the value of the sound velocity $c^2=0.20,$ in agreement with the ``realistic'' equation of state for hot hadronic matter suggested by Shuryak, in the framework of a covariant relativistic statistical mechanics of an event--anti-event system with small chemical and mass potentials. The relativistic mass distribution for such a system is obtained and shown to be a good candidate for fitting hadronic resonances, in agreement with the phenomenological models of Hagedorn, Shuryak, {\it et al.} This distribution provides a correction to the value of specific heat 3/2, of the order of 5.5\%, at low temperatures.
|
1408.1811
|
Mustafa Amin
|
Kaloian D. Lozanov and Mustafa A. Amin
|
End of inflation, oscillons and matter-antimatter asymmetry
|
19 pages, 9 figures. v3: references added and minor changes in text.
Published in Phys. Rev. D
|
Phys. Rev. D 90, 083528 (2014)
|
10.1103/PhysRevD.90.083528
| null |
hep-ph astro-ph.CO hep-th nlin.PS
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
The dynamics at the end of inflation can generate an asymmetry between
particles and anti-particles of the inflaton field. This asymmetry can be
transferred to baryons via decays, generating a baryon asymmetry in our
Universe. We explore this idea in detail for a complex inflaton governed by an
observationally consistent -"flatter than quadratic"- potential with a weakly
broken global U(1) symmetry. We find that most of the inflaton asymmetry is
locked in non-topological soliton like configurations (oscillons) produced
copiously at the end of inflation. These solitons eventually decay into baryons
and generate the observed matter-antimatter asymmetry for a range of model
parameters. Through a combination of three dimensional lattice simulations and
a detailed linearized analysis, we show how the inflaton asymmetry depends on
the fragmentation, the magnitude of the symmetry breaking term and initial
conditions at the end of inflation. We discuss the final decay into baryons,
but leave a detailed analysis of the inhomogeneous annihilation, reheating and
thermalization to future work.
As part of our work, we pay particular attention to generating multifield
initial conditions for the field fluctuations (including metric perturbations)
at the end of inflation for lattice simulations.
|
[
{
"created": "Fri, 8 Aug 2014 10:40:53 GMT",
"version": "v1"
},
{
"created": "Mon, 1 Sep 2014 18:56:44 GMT",
"version": "v2"
},
{
"created": "Thu, 4 Dec 2014 14:20:04 GMT",
"version": "v3"
}
] |
2014-12-05
|
[
[
"Lozanov",
"Kaloian D.",
""
],
[
"Amin",
"Mustafa A.",
""
]
] |
The dynamics at the end of inflation can generate an asymmetry between particles and anti-particles of the inflaton field. This asymmetry can be transferred to baryons via decays, generating a baryon asymmetry in our Universe. We explore this idea in detail for a complex inflaton governed by an observationally consistent -"flatter than quadratic"- potential with a weakly broken global U(1) symmetry. We find that most of the inflaton asymmetry is locked in non-topological soliton like configurations (oscillons) produced copiously at the end of inflation. These solitons eventually decay into baryons and generate the observed matter-antimatter asymmetry for a range of model parameters. Through a combination of three dimensional lattice simulations and a detailed linearized analysis, we show how the inflaton asymmetry depends on the fragmentation, the magnitude of the symmetry breaking term and initial conditions at the end of inflation. We discuss the final decay into baryons, but leave a detailed analysis of the inhomogeneous annihilation, reheating and thermalization to future work. As part of our work, we pay particular attention to generating multifield initial conditions for the field fluctuations (including metric perturbations) at the end of inflation for lattice simulations.
|
hep-ph/0607129
|
Shahida Dar
|
Shahida Dar, Qaisar Shafi, Arunansu Sil
|
Flux of Primordial Monopoles
|
17 pages, 4 figures, revtex4
|
Phys.Rev.D74:035013,2006
|
10.1103/PhysRevD.74.035013
|
BA-06-11
|
hep-ph
| null |
We discuss how in supersymmetric models with D and F-flat directions, a
primordial monopole flux of order 10^{-16} - 10^{-18} cm^{-2} sec^{-1} sr^{-1}
can coexist with the observed baryon asymmetry. A modified Affleck-Dine
scenario yields the desired asymmetry if the monopoles are superheavy (~
10^{13}-10^{18} GeV). For lighter monopoles with masses ~ 10^{9}-10^{12} GeV,
the baryon asymmetry can arise via TeV scale leptogenesis.
|
[
{
"created": "Tue, 11 Jul 2006 19:08:06 GMT",
"version": "v1"
}
] |
2011-05-12
|
[
[
"Dar",
"Shahida",
""
],
[
"Shafi",
"Qaisar",
""
],
[
"Sil",
"Arunansu",
""
]
] |
We discuss how in supersymmetric models with D and F-flat directions, a primordial monopole flux of order 10^{-16} - 10^{-18} cm^{-2} sec^{-1} sr^{-1} can coexist with the observed baryon asymmetry. A modified Affleck-Dine scenario yields the desired asymmetry if the monopoles are superheavy (~ 10^{13}-10^{18} GeV). For lighter monopoles with masses ~ 10^{9}-10^{12} GeV, the baryon asymmetry can arise via TeV scale leptogenesis.
|
1611.05211
|
Guanghua Duan
|
Guang Hua Duan, Ken-ichi Hikasa, Lei Wu, Jin Min Yang, Mengchao Zhang
|
Leptonic mono-top from single stop production at LHC
|
15 pages, discussions added, version accepted by JHEP
| null |
10.1007/JHEP03(2017)091
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Top squark (stop) can be produced via QCD interaction but also the
electroweak interaction at the LHC. In this paper, we investigate the
observability of the associated production of stop and chargino, $pp \to
\tilde{t}_1\tilde{\chi}^-_1$, in compressed electroweakino scenario at the 14
TeV LHC. Due to the small mass-splitting between the lightest neutralino
($\tilde{\chi}^0_1$) and chargino ($\tilde{\chi}^-_1$), such a single stop
production can give a mono-top signature through the stop decay $\tilde{t}_1
\to t \tilde{\chi}^0_1$. Focusing on the leptonic mono-top channel, we propose
a lab-frame observable $\cos\theta_{b\ell}$ to reduce the SM backgrounds in
virtue of a boosted top quark from the stop decay. We find that the single stop
production can be probed at $2\sigma$ level at the HL-LHC for
$m_{\tilde{t}_1}<760$ GeV and $m_{\tilde{\chi}^0_1}<150$ GeV.
|
[
{
"created": "Wed, 16 Nov 2016 10:31:02 GMT",
"version": "v1"
},
{
"created": "Mon, 13 Mar 2017 09:40:23 GMT",
"version": "v2"
}
] |
2017-04-05
|
[
[
"Duan",
"Guang Hua",
""
],
[
"Hikasa",
"Ken-ichi",
""
],
[
"Wu",
"Lei",
""
],
[
"Yang",
"Jin Min",
""
],
[
"Zhang",
"Mengchao",
""
]
] |
Top squark (stop) can be produced via QCD interaction but also the electroweak interaction at the LHC. In this paper, we investigate the observability of the associated production of stop and chargino, $pp \to \tilde{t}_1\tilde{\chi}^-_1$, in compressed electroweakino scenario at the 14 TeV LHC. Due to the small mass-splitting between the lightest neutralino ($\tilde{\chi}^0_1$) and chargino ($\tilde{\chi}^-_1$), such a single stop production can give a mono-top signature through the stop decay $\tilde{t}_1 \to t \tilde{\chi}^0_1$. Focusing on the leptonic mono-top channel, we propose a lab-frame observable $\cos\theta_{b\ell}$ to reduce the SM backgrounds in virtue of a boosted top quark from the stop decay. We find that the single stop production can be probed at $2\sigma$ level at the HL-LHC for $m_{\tilde{t}_1}<760$ GeV and $m_{\tilde{\chi}^0_1}<150$ GeV.
|
1412.2724
|
Wan-Il Park
|
Gabriela Barenboim, Wan-Il Park
|
Spiral Inflation
|
5 pages, 7 figures, typos corrected, matched to journal version
| null |
10.1016/j.physletb.2014.12.042
|
FTUV-14-12-25, IFIC-14-79
|
hep-ph astro-ph.CO
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We propose a novel scenario of primordial inflation in which the inflaton
goes through a spiral motion starting from around the top of a symmetry
breaking potential. We show that, even though inflation takes place for a field
value much smaller than Planck scale, it is possible to obtain relatively large
tensor to scalar ratio ($r \sim 0.1$) without fine tuning. The inflationary
observables perfectly match Planck data.
|
[
{
"created": "Mon, 8 Dec 2014 20:31:32 GMT",
"version": "v1"
},
{
"created": "Tue, 16 Dec 2014 18:08:41 GMT",
"version": "v2"
},
{
"created": "Wed, 21 Jan 2015 20:01:44 GMT",
"version": "v3"
}
] |
2018-05-09
|
[
[
"Barenboim",
"Gabriela",
""
],
[
"Park",
"Wan-Il",
""
]
] |
We propose a novel scenario of primordial inflation in which the inflaton goes through a spiral motion starting from around the top of a symmetry breaking potential. We show that, even though inflation takes place for a field value much smaller than Planck scale, it is possible to obtain relatively large tensor to scalar ratio ($r \sim 0.1$) without fine tuning. The inflationary observables perfectly match Planck data.
|
hep-ph/0107139
|
Bojan Golli
|
Wojciech Broniowski, Bojan Golli, Georges Ripka
|
Solitons in nonlocal chiral quark models
|
42 pages, 8 figures, a new section presenting the results with the
chiral-circle constraint
|
Nucl.Phys. A703 (2002) 667-701
|
10.1016/S0375-9474(01)01670-0
| null |
hep-ph nucl-th
| null |
Properties of hedgehog solitons in a chiral quark model with nonlocal
regulators are described. We discuss the formation of the hedgehog soliton, the
quantization of the baryon number, the energetic stability, the gauging and
construction of Noether currents with help of path-ordered P-exponents, and the
evaluation of observables. The issue of nonlocality is thoroughly discussed,
with a focus on contributions to observables related to the Noether currents.
It is shown that with typical model parameters the solitons are not far from
the weak nonlocality limit. The methods developed are applicable to solitons in
models with separable nonlocal four-fermion interactions.
|
[
{
"created": "Thu, 12 Jul 2001 17:26:25 GMT",
"version": "v1"
},
{
"created": "Wed, 7 Nov 2001 19:55:23 GMT",
"version": "v2"
}
] |
2009-11-07
|
[
[
"Broniowski",
"Wojciech",
""
],
[
"Golli",
"Bojan",
""
],
[
"Ripka",
"Georges",
""
]
] |
Properties of hedgehog solitons in a chiral quark model with nonlocal regulators are described. We discuss the formation of the hedgehog soliton, the quantization of the baryon number, the energetic stability, the gauging and construction of Noether currents with help of path-ordered P-exponents, and the evaluation of observables. The issue of nonlocality is thoroughly discussed, with a focus on contributions to observables related to the Noether currents. It is shown that with typical model parameters the solitons are not far from the weak nonlocality limit. The methods developed are applicable to solitons in models with separable nonlocal four-fermion interactions.
|
hep-ph/0008293
|
Sharon Jensen
|
Prem P. Srivastava and Stanley J. Brodsky
|
Light-Front QCD in Light-Cone Gauge
|
Presented at VII Hadron Physics 2000, Caraguatatuba, Sao Paulo,
Brazil, 10-15 April 2000
| null |
10.1142/9789812811653_0056
|
SLAC-PUB-8591
|
hep-ph
| null |
The light-front (LF) quantization of QCD in light-cone (l.c.) gauge is
discussed. The Dirac method is employed to construct the LF Hamiltonian and
theory quantized canonically. The Dyson-Wick perturbation theory expansion
based on LF-time ordering is constructed. The framework incorporates in it
simultaneously the Lorentz gauge condition as an operator equation as well. The
propagator of the dynamical $\psi_+$ part of the free fermionic propagator is
shown to be causal while the gauge field propagator is found to be transverse.
The interaction Hamiltonian is re-expressed in the form closely resembling the
one in covariant theory, except for additional instantaneous interactions,
which can be treated systematically. Some explicit computations in QCD are
given.
|
[
{
"created": "Mon, 28 Aug 2000 22:28:55 GMT",
"version": "v1"
}
] |
2017-08-23
|
[
[
"Srivastava",
"Prem P.",
""
],
[
"Brodsky",
"Stanley J.",
""
]
] |
The light-front (LF) quantization of QCD in light-cone (l.c.) gauge is discussed. The Dirac method is employed to construct the LF Hamiltonian and theory quantized canonically. The Dyson-Wick perturbation theory expansion based on LF-time ordering is constructed. The framework incorporates in it simultaneously the Lorentz gauge condition as an operator equation as well. The propagator of the dynamical $\psi_+$ part of the free fermionic propagator is shown to be causal while the gauge field propagator is found to be transverse. The interaction Hamiltonian is re-expressed in the form closely resembling the one in covariant theory, except for additional instantaneous interactions, which can be treated systematically. Some explicit computations in QCD are given.
|
1912.09843
|
Hee Sok Chung
|
Geoffrey T. Bodwin, Hee Sok Chung
|
New method for fitting coefficients in standard model effective theory
|
27 pages, 3 tables, minor clarifications, corrections, improvements
in notation. Corresponds to published version
|
Phys. Rev. D 101, 115039 (2020)
|
10.1103/PhysRevD.101.115039
|
TUM-EFT 134/19
|
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We present an alternative method for carrying out a principal-component
analysis of Wilson coefficients in standard model effective field theory
(SMEFT). The method is based on singular-value decomposition (SVD). The SVD
method provides information about the sensitivity of experimental observables
to physics beyond the standard model that is not accessible in the
Fisher-information method. In principle, the SVD method can also have
computational advantages over diagonalization of the Fisher information matrix.
We demonstrate the SVD method by applying it to the dimension-6 coefficients
for the process of top-quark decay to a $b$ quark and a $W$ boson and use this
example to illustrate some pitfalls in widely used fitting procedures. We also
outline an iterative procedure for applying the SVD method to dimension-8 SMEFT
coefficients.
|
[
{
"created": "Fri, 20 Dec 2019 14:23:22 GMT",
"version": "v1"
},
{
"created": "Fri, 24 Jan 2020 11:20:21 GMT",
"version": "v2"
},
{
"created": "Sat, 18 Apr 2020 20:52:42 GMT",
"version": "v3"
},
{
"created": "Fri, 5 Jun 2020 14:55:33 GMT",
"version": "v4"
},
{
"created": "Thu, 2 Jul 2020 14:06:28 GMT",
"version": "v5"
}
] |
2020-07-03
|
[
[
"Bodwin",
"Geoffrey T.",
""
],
[
"Chung",
"Hee Sok",
""
]
] |
We present an alternative method for carrying out a principal-component analysis of Wilson coefficients in standard model effective field theory (SMEFT). The method is based on singular-value decomposition (SVD). The SVD method provides information about the sensitivity of experimental observables to physics beyond the standard model that is not accessible in the Fisher-information method. In principle, the SVD method can also have computational advantages over diagonalization of the Fisher information matrix. We demonstrate the SVD method by applying it to the dimension-6 coefficients for the process of top-quark decay to a $b$ quark and a $W$ boson and use this example to illustrate some pitfalls in widely used fitting procedures. We also outline an iterative procedure for applying the SVD method to dimension-8 SMEFT coefficients.
|
hep-ph/0003252
|
Shinji Tsujikawa
|
S. Tsujikawa (Waseda University)
|
Particle production in the oscillating inflation model
|
18 pages, 14 figures
|
Phys.Rev.D61:083516,2000
|
10.1103/PhysRevD.61.083516
|
WU-AP/94/00
|
hep-ph astro-ph gr-qc hep-th
| null |
We investigate the particle production of a scalar field $\chi$ coupled to an
inflaton field $\phi$ ($g^2\phi^2\chi^2/2$) in the {\it oscillating inflation}
model, which was recently proposed by Damour and Mukhanov. Although the
fluctuation of the $\phi$ field can be effectively enhanced during a stage of
the oscillating inflation, the maximum fluctuation is suppressed as the
critical value $\phi_c$ which indicates the scale of the core part of the
inflaton potential decreases, in taking into account the back reaction effect
of created particles. As for the $\chi$ particle production, we find that
larger values of the coupling constant $g$ are required to lead to an efficient
parametric resonance with the decrease of $\phi_c$, because an effective mass
of inflaton around the minimum of its potential becomes larger. However, it is
possible to generate the superheavy $\chi$ particle whose mass is greater than
$10^{14}$ GeV, which would result in an important consequence for the GUT
baryogenesis.
|
[
{
"created": "Sun, 26 Mar 2000 05:18:43 GMT",
"version": "v1"
}
] |
2008-11-26
|
[
[
"Tsujikawa",
"S.",
"",
"Waseda University"
]
] |
We investigate the particle production of a scalar field $\chi$ coupled to an inflaton field $\phi$ ($g^2\phi^2\chi^2/2$) in the {\it oscillating inflation} model, which was recently proposed by Damour and Mukhanov. Although the fluctuation of the $\phi$ field can be effectively enhanced during a stage of the oscillating inflation, the maximum fluctuation is suppressed as the critical value $\phi_c$ which indicates the scale of the core part of the inflaton potential decreases, in taking into account the back reaction effect of created particles. As for the $\chi$ particle production, we find that larger values of the coupling constant $g$ are required to lead to an efficient parametric resonance with the decrease of $\phi_c$, because an effective mass of inflaton around the minimum of its potential becomes larger. However, it is possible to generate the superheavy $\chi$ particle whose mass is greater than $10^{14}$ GeV, which would result in an important consequence for the GUT baryogenesis.
|
0710.4110
|
Javier Magnin
|
C. Avila, I. Monroy, J.C. Sanabria, J. Magnin
|
On the s-sbar asymmetry of the nucleon sea
|
6 pages, 2 figures
| null | null | null |
hep-ph
| null |
We study the $s-\bar s$ asymmetry in the nucleon sea using a model in which
the proton wave function includes a Kaon-Hyperon Fock state. Parameters of the
model are fixed by fitting the $s-\bar s$ asymmetry obtained from global fits
to Deep Inelastic Scattering data. We discuss possible effects of the $s-\bar
s$ asymmetry on the measurement of the Weinberg angle by the NuTeV
Collaboration.
|
[
{
"created": "Mon, 22 Oct 2007 17:18:37 GMT",
"version": "v1"
}
] |
2007-10-23
|
[
[
"Avila",
"C.",
""
],
[
"Monroy",
"I.",
""
],
[
"Sanabria",
"J. C.",
""
],
[
"Magnin",
"J.",
""
]
] |
We study the $s-\bar s$ asymmetry in the nucleon sea using a model in which the proton wave function includes a Kaon-Hyperon Fock state. Parameters of the model are fixed by fitting the $s-\bar s$ asymmetry obtained from global fits to Deep Inelastic Scattering data. We discuss possible effects of the $s-\bar s$ asymmetry on the measurement of the Weinberg angle by the NuTeV Collaboration.
|
hep-ph/0209203
|
Ram Brustein
|
Irit Maor, Ram Brustein
|
Distinguishing among Scalar Field Models of Dark Energy
|
15 pages, 5 figures
|
Phys.Rev. D67 (2003) 103508
|
10.1103/PhysRevD.67.103508
| null |
hep-ph astro-ph
| null |
We show that various scalar field models of dark energy predict degenerate
luminosity distance history of the Universe and thus cannot be distinguished by
supernovae measurements alone. In particular, models with a vanishing
cosmological constant (the value of the potential at its minimum) are
degenerate with models with a positive or negative cosmological constant whose
magnitude can be as large as the critical density. Adding information from CMB
anisotropy measurements does reduce the degeneracy somewhat but not
significantly. Our results indicate that a theoretical prior on the preferred
form of the potential and the field's initial conditions may allow to
quantitatively estimate model parameters from data. Without such a theoretical
prior only limited qualitative information on the form and parameters of the
potential can be extracted even from very accurate data.
|
[
{
"created": "Wed, 18 Sep 2002 13:33:18 GMT",
"version": "v1"
}
] |
2009-11-07
|
[
[
"Maor",
"Irit",
""
],
[
"Brustein",
"Ram",
""
]
] |
We show that various scalar field models of dark energy predict degenerate luminosity distance history of the Universe and thus cannot be distinguished by supernovae measurements alone. In particular, models with a vanishing cosmological constant (the value of the potential at its minimum) are degenerate with models with a positive or negative cosmological constant whose magnitude can be as large as the critical density. Adding information from CMB anisotropy measurements does reduce the degeneracy somewhat but not significantly. Our results indicate that a theoretical prior on the preferred form of the potential and the field's initial conditions may allow to quantitatively estimate model parameters from data. Without such a theoretical prior only limited qualitative information on the form and parameters of the potential can be extracted even from very accurate data.
|
0904.0921
|
Manuel Masip
|
Manuel Masip, Iacopo Mastromatteo
|
Cosmic-ray knee and flux of secondaries from interactions of cosmic rays
with dark matter
|
Talk presented at 44th Rencontres de Moriond ("Very High Energy
Phenomena in the Universe", La Thuile, Feb. 1-8 2009)
| null | null | null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We discuss possible implications of a large interaction cross section between
cosmic rays and dark matter particles due to new physics at the TeV scale. In
particular, in models with extra dimensions and a low fundamental scale of
gravity the cross section grows very fast at transplanckian energies. We argue
that the knee observed in the cosmic ray flux could be caused by such
interactions. We show that this hypothesis implies a well defined flux of
secondary gamma rays that seems consistent with MILAGRO observations.
|
[
{
"created": "Mon, 6 Apr 2009 13:50:13 GMT",
"version": "v1"
}
] |
2009-04-07
|
[
[
"Masip",
"Manuel",
""
],
[
"Mastromatteo",
"Iacopo",
""
]
] |
We discuss possible implications of a large interaction cross section between cosmic rays and dark matter particles due to new physics at the TeV scale. In particular, in models with extra dimensions and a low fundamental scale of gravity the cross section grows very fast at transplanckian energies. We argue that the knee observed in the cosmic ray flux could be caused by such interactions. We show that this hypothesis implies a well defined flux of secondary gamma rays that seems consistent with MILAGRO observations.
|
0710.1922
|
Bowen Xiao
|
Bo-Wen Xiao
|
On the anomalous dimensions of the multiple pomeron exchanges
|
26 pages, 7 figures. A few changes are made in Appendix F
|
Nucl.Phys.A798:132-164,2008
|
10.1016/j.nuclphysa.2007.10.013
| null |
hep-ph
| null |
High energy hard scattering in large $N_{c}$ limit can be described by the
QCD dipole model. In this paper, single, double and triple BFKL pomeron
exchange amplitudes are computed explicitly within the dipole model. Based on
the calculation, the general formula
$\gamma^{(k)*}_{0}=\chi^{-1}(k\chi({1/2}))$ which governs the anomalous
dimension of $1\Rightarrow k$ amplitude is conjectured. As far as the unitarity
problem is concerned, we find that the anomalous dimension $\gamma$ varies from
graph to graph due to the DGLAP evolution. In the end, a comparison between
this computation and reggeon field theory is provided.
|
[
{
"created": "Wed, 10 Oct 2007 04:20:06 GMT",
"version": "v1"
},
{
"created": "Fri, 12 Oct 2007 01:13:37 GMT",
"version": "v2"
},
{
"created": "Tue, 20 Nov 2007 05:55:28 GMT",
"version": "v3"
}
] |
2010-03-25
|
[
[
"Xiao",
"Bo-Wen",
""
]
] |
High energy hard scattering in large $N_{c}$ limit can be described by the QCD dipole model. In this paper, single, double and triple BFKL pomeron exchange amplitudes are computed explicitly within the dipole model. Based on the calculation, the general formula $\gamma^{(k)*}_{0}=\chi^{-1}(k\chi({1/2}))$ which governs the anomalous dimension of $1\Rightarrow k$ amplitude is conjectured. As far as the unitarity problem is concerned, we find that the anomalous dimension $\gamma$ varies from graph to graph due to the DGLAP evolution. In the end, a comparison between this computation and reggeon field theory is provided.
|
hep-ph/0307015
|
J. A. R. Cembranos
|
J.A.R. Cembranos, A. Dobado, A. L. Maroto
|
Living on a brane
|
4 pages, 1 figure. Proceedings of the 29th Spanish Physical Royal
Society Biennial on the centennial of the society, Madrid, Spain, July 2003
|
RSEF Conf.Proc. M-30628 (2003) 808
| null | null |
hep-ph
| null |
We briefly review the distinctive signals of brane world models with low
tension. We pay special attention to the brane fluctuations (branons), whose
phenomenological consequences could be important both in high energy particle
physics experiments and in astrophysical and cosmological observations.
|
[
{
"created": "Tue, 1 Jul 2003 11:11:37 GMT",
"version": "v1"
}
] |
2007-05-23
|
[
[
"Cembranos",
"J. A. R.",
""
],
[
"Dobado",
"A.",
""
],
[
"Maroto",
"A. L.",
""
]
] |
We briefly review the distinctive signals of brane world models with low tension. We pay special attention to the brane fluctuations (branons), whose phenomenological consequences could be important both in high energy particle physics experiments and in astrophysical and cosmological observations.
|
2112.10618
|
Giovanni Barontini
|
G. Barontini, L. Blackburn, V. Boyer, F. Butuc-Mayer, X. Calmet, J. R.
Crespo Lopez-Urrutia, E. A. Curtis, B. Darquie, J. Dunningham, N. J. Fitch,
E. M. Forgan, K. Georgiou, P. Gill, R. M. Godun, J. Goldwin, V. Guarrera, A.
C. Harwood, I. R. Hill, R. J. Hendricks, M. Jeong, M. Y. H. Johnson, M.
Keller, L. P. Kozhiparambil Sajith, F. Kuipers, H. S. Margolis, C. Mayo, P.
Newman, A. O. Parsons, L. Prokhorov, B. I. Robertson, J. Rodewald, M. S.
Safronova, B. E. Sauer, M. Schioppo, N. Sherrill, Y. V. Stadnik, K.
Szymaniec, M. R. Tarbutt, R. C. Thompson, A. Tofful, J. Tunesi, A. Vecchio,
Y. Wang and S. Worm
|
Measuring the stability of fundamental constants with a network of
clocks
| null |
EPJ Quantum Technology volume 9, Article number: 12 (2022)
|
10.1140/epjqt/s40507-022-00130-5
| null |
hep-ph astro-ph.CO gr-qc hep-ex physics.atom-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
The detection of variations of fundamental constants of the Standard Model
would provide us with compelling evidence of new physics, and could lift the
veil on the nature of dark matter and dark energy. In this work, we discuss how
a network of atomic and molecular clocks can be used to look for such
variations with unprecedented sensitivity over a wide range of time scales.
This is precisely the goal of the recently launched QSNET project: A network of
clocks for measuring the stability of fundamental constants. QSNET will include
state-of-the-art atomic clocks, but will also develop next-generation molecular
and highly charged ion clocks with enhanced sensitivity to variations of
fundamental constants. We describe the technological and scientific aims of
QSNET and evaluate its expected performance. We show that in the range of
parameters probed by QSNET, either we will discover new physics, or we will
impose new constraints on violations of fundamental symmetries and a range of
theories beyond the Standard Model, including dark matter and dark energy
models.
|
[
{
"created": "Mon, 20 Dec 2021 15:31:35 GMT",
"version": "v1"
},
{
"created": "Wed, 11 May 2022 11:12:17 GMT",
"version": "v2"
}
] |
2022-05-12
|
[
[
"Barontini",
"G.",
""
],
[
"Blackburn",
"L.",
""
],
[
"Boyer",
"V.",
""
],
[
"Butuc-Mayer",
"F.",
""
],
[
"Calmet",
"X.",
""
],
[
"Lopez-Urrutia",
"J. R. Crespo",
""
],
[
"Curtis",
"E. A.",
""
],
[
"Darquie",
"B.",
""
],
[
"Dunningham",
"J.",
""
],
[
"Fitch",
"N. J.",
""
],
[
"Forgan",
"E. M.",
""
],
[
"Georgiou",
"K.",
""
],
[
"Gill",
"P.",
""
],
[
"Godun",
"R. M.",
""
],
[
"Goldwin",
"J.",
""
],
[
"Guarrera",
"V.",
""
],
[
"Harwood",
"A. C.",
""
],
[
"Hill",
"I. R.",
""
],
[
"Hendricks",
"R. J.",
""
],
[
"Jeong",
"M.",
""
],
[
"Johnson",
"M. Y. H.",
""
],
[
"Keller",
"M.",
""
],
[
"Sajith",
"L. P. Kozhiparambil",
""
],
[
"Kuipers",
"F.",
""
],
[
"Margolis",
"H. S.",
""
],
[
"Mayo",
"C.",
""
],
[
"Newman",
"P.",
""
],
[
"Parsons",
"A. O.",
""
],
[
"Prokhorov",
"L.",
""
],
[
"Robertson",
"B. I.",
""
],
[
"Rodewald",
"J.",
""
],
[
"Safronova",
"M. S.",
""
],
[
"Sauer",
"B. E.",
""
],
[
"Schioppo",
"M.",
""
],
[
"Sherrill",
"N.",
""
],
[
"Stadnik",
"Y. V.",
""
],
[
"Szymaniec",
"K.",
""
],
[
"Tarbutt",
"M. R.",
""
],
[
"Thompson",
"R. C.",
""
],
[
"Tofful",
"A.",
""
],
[
"Tunesi",
"J.",
""
],
[
"Vecchio",
"A.",
""
],
[
"Wang",
"Y.",
""
],
[
"Worm",
"S.",
""
]
] |
The detection of variations of fundamental constants of the Standard Model would provide us with compelling evidence of new physics, and could lift the veil on the nature of dark matter and dark energy. In this work, we discuss how a network of atomic and molecular clocks can be used to look for such variations with unprecedented sensitivity over a wide range of time scales. This is precisely the goal of the recently launched QSNET project: A network of clocks for measuring the stability of fundamental constants. QSNET will include state-of-the-art atomic clocks, but will also develop next-generation molecular and highly charged ion clocks with enhanced sensitivity to variations of fundamental constants. We describe the technological and scientific aims of QSNET and evaluate its expected performance. We show that in the range of parameters probed by QSNET, either we will discover new physics, or we will impose new constraints on violations of fundamental symmetries and a range of theories beyond the Standard Model, including dark matter and dark energy models.
|
1101.1832
|
Julien Baglio
|
J. Baglio, A. Djouadi, S. Ferrag and R.M. Godbole
|
The Tevatron Higgs exclusion limits and theoretical uncertainties: a
critical appraisal
|
11 pages, 5 Figures. Version published in Physics Letter B, including
an erratum
|
Phys.Lett.B699:368-371,2011; Erratum-ibid.B702:105-106,2011
|
10.1016/j.physletb.2011.04.039 10.1016/j.physletb.2011.06.074
|
CERN-PH-TH/2010-315, LPT-ORSAY-10-107
|
hep-ph hep-ex
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We examine the exclusion limits set by the CDF and D0 experiments on the
Standard Model Higgs boson mass from their searches at the Tevatron in the
light of large theoretical uncertainties on the signal and background cross
sections. We show that when these uncertainties are consistently taken into
account, the sensitivity of the experiments becomes significantly lower and the
currently excluded mass range $M_H=158$-175 GeV would be entirely reopened. The
necessary luminosity required to recover the current sensitivity is found to be
a factor of two higher than the present one.
|
[
{
"created": "Mon, 10 Jan 2011 14:40:53 GMT",
"version": "v1"
},
{
"created": "Thu, 28 Apr 2011 17:24:13 GMT",
"version": "v2"
},
{
"created": "Sat, 25 Jun 2011 07:39:25 GMT",
"version": "v3"
}
] |
2011-07-26
|
[
[
"Baglio",
"J.",
""
],
[
"Djouadi",
"A.",
""
],
[
"Ferrag",
"S.",
""
],
[
"Godbole",
"R. M.",
""
]
] |
We examine the exclusion limits set by the CDF and D0 experiments on the Standard Model Higgs boson mass from their searches at the Tevatron in the light of large theoretical uncertainties on the signal and background cross sections. We show that when these uncertainties are consistently taken into account, the sensitivity of the experiments becomes significantly lower and the currently excluded mass range $M_H=158$-175 GeV would be entirely reopened. The necessary luminosity required to recover the current sensitivity is found to be a factor of two higher than the present one.
|
1705.08192
|
Ahmad Farzaneh Kord Dr
|
M. Haddadi Moghaddam, B. Azadegan, A. F. Kord and W. M. Alberico
|
Non-relativistic approximate numerical ideal-magneto hydrodynamics of
(1+1) D transverse flow in Bjorken scenario
| null |
Eur.Phys.J. C78 (2018) no.3, 255
|
10.1140/epjc/s10052-018-5708-1
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
In this study, we investigate the impact of the magnetic field on the
evolution of the transverse flow of QGP matter in the magneto-hydrodynamic
(MHD) framework. We assume that the magnetic field is perpendicular to the
reaction plane and then we solve the coupled Maxwell and conservation equations
in (1+1D) transverse flow, within the Bjorken scenario. We consider a QGP with
infinite electrical conductivity. First, the magnetic effects on the QGP medium
at mid-rapidity are investigated at leading order; then the time and space
dependence of the energy density, velocity and magnetic field in the transverse
plane of the ideal magnetized hot plasma are obtained.
|
[
{
"created": "Tue, 23 May 2017 11:39:06 GMT",
"version": "v1"
},
{
"created": "Sun, 15 Oct 2017 09:38:21 GMT",
"version": "v2"
}
] |
2019-12-03
|
[
[
"Moghaddam",
"M. Haddadi",
""
],
[
"Azadegan",
"B.",
""
],
[
"Kord",
"A. F.",
""
],
[
"Alberico",
"W. M.",
""
]
] |
In this study, we investigate the impact of the magnetic field on the evolution of the transverse flow of QGP matter in the magneto-hydrodynamic (MHD) framework. We assume that the magnetic field is perpendicular to the reaction plane and then we solve the coupled Maxwell and conservation equations in (1+1D) transverse flow, within the Bjorken scenario. We consider a QGP with infinite electrical conductivity. First, the magnetic effects on the QGP medium at mid-rapidity are investigated at leading order; then the time and space dependence of the energy density, velocity and magnetic field in the transverse plane of the ideal magnetized hot plasma are obtained.
|
2404.18667
|
Juliane Haug
|
Juliane Haug, Oliver Sch\"ule, and Fabian Wunder
|
A semi-analytical $x$-space solution for parton evolution -- Application
to non-singlet and singlet DGLAP equation
|
29 pages, 11 figures, ancillary files with Mathematica and Python
implementations of POMPOM, updated to match journal version
|
JHEP 07 (2024) 072
|
10.1007/JHEP07(2024)072
| null |
hep-ph
|
http://creativecommons.org/licenses/by/4.0/
|
We present a novel semi-analytical method for parton evolution. It is based
on constructing a family of analytic functions spanning $x$-space which is
closed under the considered evolution equation. Using these functions as a
basis, the original integro-differential evolution equation transforms into a
system of coupled ordinary differential equations, which can be solved
numerically by restriction to a suitably chosen finite subsystem. The evolved
distributions are obtained as analytic functions in $x$ with numerically
obtained coefficients, providing insight into the analytic behavior of the
evolved parton distributions. As a proof-of-principle, we apply our method to
the leading order non-singlet and singlet DGLAP equation. Comparing our results
to traditional Mellin-space methods, we find good agreement. The method is
implemented in the code $\texttt{POMPOM}$ in $\texttt{Mathematica}$ as well as
in $\texttt{Python}$.
|
[
{
"created": "Mon, 29 Apr 2024 12:55:22 GMT",
"version": "v1"
},
{
"created": "Tue, 30 Apr 2024 14:54:10 GMT",
"version": "v2"
},
{
"created": "Mon, 10 Jun 2024 14:11:47 GMT",
"version": "v3"
},
{
"created": "Fri, 2 Aug 2024 12:01:07 GMT",
"version": "v4"
}
] |
2024-08-05
|
[
[
"Haug",
"Juliane",
""
],
[
"Schüle",
"Oliver",
""
],
[
"Wunder",
"Fabian",
""
]
] |
We present a novel semi-analytical method for parton evolution. It is based on constructing a family of analytic functions spanning $x$-space which is closed under the considered evolution equation. Using these functions as a basis, the original integro-differential evolution equation transforms into a system of coupled ordinary differential equations, which can be solved numerically by restriction to a suitably chosen finite subsystem. The evolved distributions are obtained as analytic functions in $x$ with numerically obtained coefficients, providing insight into the analytic behavior of the evolved parton distributions. As a proof-of-principle, we apply our method to the leading order non-singlet and singlet DGLAP equation. Comparing our results to traditional Mellin-space methods, we find good agreement. The method is implemented in the code $\texttt{POMPOM}$ in $\texttt{Mathematica}$ as well as in $\texttt{Python}$.
|
1605.03224
|
Fei Teng
|
Jason Kumar, Pearl Sandick, Fei Teng and Takahiro Yamamoto
|
Gamma-ray Signals from Dark Matter Annihilation Via Charged Mediators
|
34 pages, 27 figures. One reference added. Published version
|
Phys. Rev. D 94, 015022 (2016)
|
10.1103/PhysRevD.94.015022
| null |
hep-ph astro-ph.CO astro-ph.HE
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We consider a simplified model in which Majorana fermion dark matter
annihilates to charged fermions through exchange of charged mediators. We
consider the gamma-ray signals arising from the processes $XX \rightarrow \bar
f f \gamma$, $\gamma \gamma$, and $\gamma Z$ in the most general case,
including non-trivial fermion mass and non-trivial left-right mixing and
$CP$-violating phase for the charged mediators. In particular, we find the most
general spectrum for internal bremsstrahlung, which interpolates between the
regimes dominated by virtual internal bremsstrahlung and by final state
radiation. We also examine the variation in the ratio $\sigma(\gamma \gamma) /
\sigma (\gamma Z)$ and the helicity asymmetry in the $XX \rightarrow \gamma
\gamma$ process, each as a function of mixing angle and $CP$-violating phase.
As an application, we apply these results to searches for a class of MSSM
models.
|
[
{
"created": "Tue, 10 May 2016 21:53:39 GMT",
"version": "v1"
},
{
"created": "Tue, 19 Jul 2016 06:12:29 GMT",
"version": "v2"
}
] |
2016-07-27
|
[
[
"Kumar",
"Jason",
""
],
[
"Sandick",
"Pearl",
""
],
[
"Teng",
"Fei",
""
],
[
"Yamamoto",
"Takahiro",
""
]
] |
We consider a simplified model in which Majorana fermion dark matter annihilates to charged fermions through exchange of charged mediators. We consider the gamma-ray signals arising from the processes $XX \rightarrow \bar f f \gamma$, $\gamma \gamma$, and $\gamma Z$ in the most general case, including non-trivial fermion mass and non-trivial left-right mixing and $CP$-violating phase for the charged mediators. In particular, we find the most general spectrum for internal bremsstrahlung, which interpolates between the regimes dominated by virtual internal bremsstrahlung and by final state radiation. We also examine the variation in the ratio $\sigma(\gamma \gamma) / \sigma (\gamma Z)$ and the helicity asymmetry in the $XX \rightarrow \gamma \gamma$ process, each as a function of mixing angle and $CP$-violating phase. As an application, we apply these results to searches for a class of MSSM models.
|
hep-ph/0005097
|
W. Des Ramsay
|
Willem T.H. van Oers (University of Manitoba, Canada)
|
Constraints on a Parity-even/Time-Reversal-odd Interaction
|
7 Pages LaTeX, 2 PostScript figures, uses aipproc.sty. Written
version of Invited Paper presented at the 3rd International Symposium on
Symmetries in Subatomic Physics, Adelaide, SA, Australia, March 13-17, 2000
|
AIP Conf.Proc. 539 (2000) 66-72
|
10.1063/1.1330903
|
TRI-PP-00-18
|
hep-ph
| null |
Time-Reversal-Invariance non-conservation has for the first time been
unequivocally demonstrated in a direct measurement, one of the results of the
CPLEAR experiment. What is the situation then with regard to
time-reversal-invariance non-conservation in systems other than the neutral
kaon system? Two classes of tests of time-reversal-invariance need to be
distinguished: the first one deals with parity violating
(P-odd)/time-reversal-invariance non-conserving (T-odd) interactions, while the
second one deals with P-even/T-odd interactions (assuming CPT conservation this
implies C-conjugation non-conservation). Limits on a P-odd/T-odd interaction
follow from measurements of the electric dipole moment of the neutron. This in
turn provides a limit on a P-odd/T-odd pion-nucleon coupling constant which is
10^-4 times the weak interaction strength. Limits on a P-even/T-odd interaction
are much less stringent. The better constraint stems also from the measurement
of the electric dipole moment of the neutron. Of all the other tests,
measurements of charge-symmetry breaking in neutron-proton elastic scattering
provide the next better constraint. The latter experiments were performed at
TRIUMF (at 477 and 347 MeV) and at IUCF (at 183 MeV). Weak decay experiments
(the transverse polarization of the muon in K+ -> pi0 mu+ nu and the transverse
polarization of the positrons in polarized muon decay) have the potential to
provide comparable or possibly better constraints.
|
[
{
"created": "Wed, 10 May 2000 22:37:16 GMT",
"version": "v1"
}
] |
2009-10-31
|
[
[
"van Oers",
"Willem T. H.",
"",
"University of Manitoba, Canada"
]
] |
Time-Reversal-Invariance non-conservation has for the first time been unequivocally demonstrated in a direct measurement, one of the results of the CPLEAR experiment. What is the situation then with regard to time-reversal-invariance non-conservation in systems other than the neutral kaon system? Two classes of tests of time-reversal-invariance need to be distinguished: the first one deals with parity violating (P-odd)/time-reversal-invariance non-conserving (T-odd) interactions, while the second one deals with P-even/T-odd interactions (assuming CPT conservation this implies C-conjugation non-conservation). Limits on a P-odd/T-odd interaction follow from measurements of the electric dipole moment of the neutron. This in turn provides a limit on a P-odd/T-odd pion-nucleon coupling constant which is 10^-4 times the weak interaction strength. Limits on a P-even/T-odd interaction are much less stringent. The better constraint stems also from the measurement of the electric dipole moment of the neutron. Of all the other tests, measurements of charge-symmetry breaking in neutron-proton elastic scattering provide the next better constraint. The latter experiments were performed at TRIUMF (at 477 and 347 MeV) and at IUCF (at 183 MeV). Weak decay experiments (the transverse polarization of the muon in K+ -> pi0 mu+ nu and the transverse polarization of the positrons in polarized muon decay) have the potential to provide comparable or possibly better constraints.
|
hep-ph/9711431
|
Peter Minkowski
|
P. Minkowski
|
Note on the Mass Square of the Eta' Meson
|
8 pages
|
Phys.Lett. B423 (1998) 157-161
|
10.1016/S0370-2693(98)00130-0
|
BUTP-97/35
|
hep-ph
| null |
We propose to use as a mathematical tool to study the mass square of the
etaprime meson an infinitely heavy supplementary quark flavor Q. This is
understood in the framework of QCD with one light quark flavor (or n_fl light
flavors) and the gauge group SU3 colour (or SUN colour). The full system thus
consists of n_fl + 1 flavors, including the infinitely heavy one. The purpose
of this note is to show how the heavy flavor can be made to represent the
anomalies of the subtheory describing the remnant physical degrees of freedom.
In the large N_c limit the mass square of etaprime tends to a finite limit. The
essential deviations from (semi) perturbative derivations are related to simple
properties of the 'heavy' flavor.
|
[
{
"created": "Mon, 24 Nov 1997 08:05:52 GMT",
"version": "v1"
}
] |
2009-10-30
|
[
[
"Minkowski",
"P.",
""
]
] |
We propose to use as a mathematical tool to study the mass square of the etaprime meson an infinitely heavy supplementary quark flavor Q. This is understood in the framework of QCD with one light quark flavor (or n_fl light flavors) and the gauge group SU3 colour (or SUN colour). The full system thus consists of n_fl + 1 flavors, including the infinitely heavy one. The purpose of this note is to show how the heavy flavor can be made to represent the anomalies of the subtheory describing the remnant physical degrees of freedom. In the large N_c limit the mass square of etaprime tends to a finite limit. The essential deviations from (semi) perturbative derivations are related to simple properties of the 'heavy' flavor.
|
1603.09152
|
Manjit Kaur Dr.
|
M. Kaur and Ruchi Gupta
|
Parton level study of high ET jets in hard QCD processes at LHC
|
5 pages
| null | null | null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Inclusive jet production will dominate the high $Q^{2}$ final states at the
LHC.~In this work we try to estimate the up-to-date expectations, for high
$E_{T}$ jets and their expected origin from the various parton-parton
scattering processes. For these studies we have used a standard Parton
Distribution Function (PDF) and simulated millions of events with the PYTHIA8
event genertor. The results are compared with simulations for center-of-mass
energies of 0.9 TeV, 2.36 TeV, 7 TeV and 14 TeV corresponding to existing and
future LHC runs. We present some expectations for the relative cross sections
of different quark flavours which indicates that eventually we might be able to
measure the cross section for b-flavoured jets with reasonable accuracy up to
an $E_T$ of a few TeV.
|
[
{
"created": "Wed, 30 Mar 2016 12:23:27 GMT",
"version": "v1"
}
] |
2016-03-31
|
[
[
"Kaur",
"M.",
""
],
[
"Gupta",
"Ruchi",
""
]
] |
Inclusive jet production will dominate the high $Q^{2}$ final states at the LHC.~In this work we try to estimate the up-to-date expectations, for high $E_{T}$ jets and their expected origin from the various parton-parton scattering processes. For these studies we have used a standard Parton Distribution Function (PDF) and simulated millions of events with the PYTHIA8 event genertor. The results are compared with simulations for center-of-mass energies of 0.9 TeV, 2.36 TeV, 7 TeV and 14 TeV corresponding to existing and future LHC runs. We present some expectations for the relative cross sections of different quark flavours which indicates that eventually we might be able to measure the cross section for b-flavoured jets with reasonable accuracy up to an $E_T$ of a few TeV.
|
0804.1521
|
Stefano Morisi
|
M.Hirsch, S.Morisi and J.W.F.Valle
|
Tri-bimaximal neutrino mixing and neutrinoless double beta decay
|
4 pages and 3 figures
|
Phys.Rev.D78:093007,2008
|
10.1103/PhysRevD.78.093007
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We present a tri-bimaximal lepton mixing scheme where the neutrinoless double
beta decay rate (bb0v) has a lower bound which correlates with the ratio alpha
= Dmsol/Dmatm well determined by current data, as well as with the unknown
Majorana CP phase phi12 characterizing the solar neutrino sub-system. For the
special value phi12 = pi/2 (opposite CP-sign neutrinos) the bb0v rate vanishes
at tree level when Dmsol/Dmatm = 3/80, only allowed at 3 sigma. For all other
cases the rate is nonzero, and lies within current and projected experimental
sensitivities close to phi12=0. We suggest two model realizations of this
scheme in terms of an A4xZ2 and A4xZ4 flavour symmetries.
|
[
{
"created": "Wed, 9 Apr 2008 19:32:18 GMT",
"version": "v1"
}
] |
2008-12-18
|
[
[
"Hirsch",
"M.",
""
],
[
"Morisi",
"S.",
""
],
[
"Valle",
"J. W. F.",
""
]
] |
We present a tri-bimaximal lepton mixing scheme where the neutrinoless double beta decay rate (bb0v) has a lower bound which correlates with the ratio alpha = Dmsol/Dmatm well determined by current data, as well as with the unknown Majorana CP phase phi12 characterizing the solar neutrino sub-system. For the special value phi12 = pi/2 (opposite CP-sign neutrinos) the bb0v rate vanishes at tree level when Dmsol/Dmatm = 3/80, only allowed at 3 sigma. For all other cases the rate is nonzero, and lies within current and projected experimental sensitivities close to phi12=0. We suggest two model realizations of this scheme in terms of an A4xZ2 and A4xZ4 flavour symmetries.
|
hep-ph/0001139
|
Lynne Orr
|
Lynne H. Orr (Rochester) and W.J. Stirling (Durham)
|
BFKL Monte Carlo for Dijet Production at Hadron Colliders
|
3 pages including 2 figures, Latex, uses fleqn,epsfig,run2col;
contribution to the proceedings of the Fermilab Run II Workshop, QCD and Weak
Boson Physics
| null | null |
UR-1599
|
hep-ph
| null |
The production of jet pairs at large rapidity difference at hadron colliders
is potentially sensitive to BFKL physics. We present the results of a BFKL
Monte Carlo calculation of dijets at the Tevatron. The Monte Carlo incorporates
kinematic effects that are absent in analytic BFKL calculations; these effects
significantly modify the behavior of dijet cross sections.
|
[
{
"created": "Fri, 14 Jan 2000 21:35:06 GMT",
"version": "v1"
}
] |
2007-05-23
|
[
[
"Orr",
"Lynne H.",
"",
"Rochester"
],
[
"Stirling",
"W. J.",
"",
"Durham"
]
] |
The production of jet pairs at large rapidity difference at hadron colliders is potentially sensitive to BFKL physics. We present the results of a BFKL Monte Carlo calculation of dijets at the Tevatron. The Monte Carlo incorporates kinematic effects that are absent in analytic BFKL calculations; these effects significantly modify the behavior of dijet cross sections.
|
1706.04598
|
Bhavesh Chauhan
|
Bhavesh Chauhan, Bharti Kindra, Ashish Narang
|
Discrepancies in simultaneous explanation of Flavor Anomalies and
IceCube PeV Events using Leptoquarks
|
References updated; Conclusion Changed; Matches published version
|
Phys. Rev. D 97, 095007 (2018)
|
10.1103/PhysRevD.97.095007
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Leptoquarks have been suggested to solve a variety of discrepancies between
the expected and observed phenomenon. In this paper, we show that the scalar
doublet Leptoquark with Hypercharge 7/6 can simultaneously explain the recent
measurement of $R_{K}$, $R_{K^*}$, the excess in anomalous magnetic moment of
muon, and the observed excess in IceCube HESE data. For appropriate choice of
couplings, the flavor anomalies are generated at one-loop level and IceCube
data is explained via resonant production of the Leptoquark. Several
constraints from LHC searches are imposed on the model parameter space.
|
[
{
"created": "Wed, 14 Jun 2017 17:32:11 GMT",
"version": "v1"
},
{
"created": "Thu, 29 Jun 2017 07:40:16 GMT",
"version": "v2"
},
{
"created": "Wed, 16 May 2018 08:10:55 GMT",
"version": "v3"
}
] |
2018-05-23
|
[
[
"Chauhan",
"Bhavesh",
""
],
[
"Kindra",
"Bharti",
""
],
[
"Narang",
"Ashish",
""
]
] |
Leptoquarks have been suggested to solve a variety of discrepancies between the expected and observed phenomenon. In this paper, we show that the scalar doublet Leptoquark with Hypercharge 7/6 can simultaneously explain the recent measurement of $R_{K}$, $R_{K^*}$, the excess in anomalous magnetic moment of muon, and the observed excess in IceCube HESE data. For appropriate choice of couplings, the flavor anomalies are generated at one-loop level and IceCube data is explained via resonant production of the Leptoquark. Several constraints from LHC searches are imposed on the model parameter space.
|
1304.0202
|
Mikko Laine
|
M. Laine
|
Thermal 2-loop master spectral function at finite momentum
|
29 pages. v2: numerics improved; to appear in JHEP
| null |
10.1007/JHEP05(2013)083
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
When considering NLO corrections to thermal particle production in the
"relativistic" regime, in which the invariant mass squared of the produced
particle is K^2 ~ (pi T)^2, then the production rate can be expressed as a sum
of a few universal "master" spectral functions. Taking the most complicated
2-loop master as an example, a general strategy for obtaining a convergent
2-dimensional integral representation is suggested. The analysis applies both
to bosonic and fermionic statistics, and shows that for this master the
non-relativistic approximation is only accurate for K^2 > (8 pi T)^2, whereas
the zero-momentum approximation works surprisingly well. Once the simpler
masters have been similarly resolved, NLO results for quantities such as the
right-handed neutrino production rate from a Standard Model plasma or the
dilepton production rate from a QCD plasma can be assembled for K^2 ~ (pi T)^2.
|
[
{
"created": "Sun, 31 Mar 2013 13:07:19 GMT",
"version": "v1"
},
{
"created": "Thu, 2 May 2013 07:03:41 GMT",
"version": "v2"
}
] |
2015-06-15
|
[
[
"Laine",
"M.",
""
]
] |
When considering NLO corrections to thermal particle production in the "relativistic" regime, in which the invariant mass squared of the produced particle is K^2 ~ (pi T)^2, then the production rate can be expressed as a sum of a few universal "master" spectral functions. Taking the most complicated 2-loop master as an example, a general strategy for obtaining a convergent 2-dimensional integral representation is suggested. The analysis applies both to bosonic and fermionic statistics, and shows that for this master the non-relativistic approximation is only accurate for K^2 > (8 pi T)^2, whereas the zero-momentum approximation works surprisingly well. Once the simpler masters have been similarly resolved, NLO results for quantities such as the right-handed neutrino production rate from a Standard Model plasma or the dilepton production rate from a QCD plasma can be assembled for K^2 ~ (pi T)^2.
|
1303.2740
|
Yutaka Ookouchi
|
Kohei Kamada, Tatsuo Kobayashi, Keisuke Ohashi and Yutaka Ookouchi
|
Cosmic R-string in thermal history
|
28 pages, 11 figures, v2: references added
| null |
10.1007/JHEP05(2013)091
|
KUNS-2437, DESY 13-033, OCU-PHYS-381
|
hep-ph hep-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We study stabilization of an unstable cosmic string associated with
spontaneously broken $U(1)_R$ symmetry, which otherwise causes a dangerous
roll-over process. We demonstrate that in a gauge mediation model, messengers
can receive enough corrections from the thermal plasma of the supersymmetric
standard model particles to stabilize the unstable modes of the string.
|
[
{
"created": "Tue, 12 Mar 2013 01:17:27 GMT",
"version": "v1"
},
{
"created": "Thu, 2 May 2013 05:50:53 GMT",
"version": "v2"
}
] |
2015-06-15
|
[
[
"Kamada",
"Kohei",
""
],
[
"Kobayashi",
"Tatsuo",
""
],
[
"Ohashi",
"Keisuke",
""
],
[
"Ookouchi",
"Yutaka",
""
]
] |
We study stabilization of an unstable cosmic string associated with spontaneously broken $U(1)_R$ symmetry, which otherwise causes a dangerous roll-over process. We demonstrate that in a gauge mediation model, messengers can receive enough corrections from the thermal plasma of the supersymmetric standard model particles to stabilize the unstable modes of the string.
|
1207.0331
|
German Rodrigo
|
German Rodrigo
|
The ttbar asymmetry in the Standard Model and beyond
|
8 pages. Contribution to the proceedings of the 47th Renc\^ontres de
Moriond, EW 2012 session
| null | null |
LPN12-074; IFIC/12-47
|
hep-ph hep-ex
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
A sizable charge asymmetry in top quark pair production has been observed at
the Tevatron. The experimental results seem to exceed systematically the
Standard Model theory predictions by a significant amount and have triggered a
large number of suggestions for 'new physics'. The effect is also visible at
the LHC, and preliminary results have already been presented by the ATLAS and
CMS collaborations. In this talk, we review the present status of the
theoretical predictions, and their comparison with the experimental
measurements.
|
[
{
"created": "Mon, 2 Jul 2012 10:38:46 GMT",
"version": "v1"
}
] |
2012-07-03
|
[
[
"Rodrigo",
"German",
""
]
] |
A sizable charge asymmetry in top quark pair production has been observed at the Tevatron. The experimental results seem to exceed systematically the Standard Model theory predictions by a significant amount and have triggered a large number of suggestions for 'new physics'. The effect is also visible at the LHC, and preliminary results have already been presented by the ATLAS and CMS collaborations. In this talk, we review the present status of the theoretical predictions, and their comparison with the experimental measurements.
|
hep-ph/0212325
|
Leutwyler
|
H. Leutwyler (University of Bern)
|
Strong Interactions at Low Energy
|
Lectures given at the school of physics "Understanding the structure
of hadrons", Prague, July 2001, 20 pp
|
Czech.J.Phys. 52 (2002) B9-B27
|
10.1007/s10582-002-0077-1
| null |
hep-ph
| null |
The lectures review some of the basic concepts relevant for an understanding
of the low energy properties of the strong interactions: chiral symmetry,
spontaneous symmetry breakdown, Goldstone bosons, quark condensate. The
effective field theory used to analyze the low energy structure is briefly
sketched. As an illustration, I discuss the implications of the recent data on
the decay $K\to \pi\pi e\nu$ for the magnitude of the quark condensate.
|
[
{
"created": "Fri, 20 Dec 2002 23:55:10 GMT",
"version": "v1"
}
] |
2015-06-25
|
[
[
"Leutwyler",
"H.",
"",
"University of Bern"
]
] |
The lectures review some of the basic concepts relevant for an understanding of the low energy properties of the strong interactions: chiral symmetry, spontaneous symmetry breakdown, Goldstone bosons, quark condensate. The effective field theory used to analyze the low energy structure is briefly sketched. As an illustration, I discuss the implications of the recent data on the decay $K\to \pi\pi e\nu$ for the magnitude of the quark condensate.
|
1012.1595
|
Mu-Chun Chen
|
Mu-Chun Chen, K.T. Mahanthappa
|
Models and Phenomenology of Neutrino Masses circa 2010
|
Plenary Talk presented at the XXIV International Conference on
Neutrino Physics and Astrophysics (Neutrino 2010), Athens, Greece, June
14-19, 2010; v2: content expanded; 5 pages, no figure
| null | null |
COLO-HEP-560; UCI-TR-2010-32
|
hep-ph hep-ex
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We review recent developments in models of neutrino masses and mixing.
Emphases are given to models based on finite group family symmetries from which
the tri-bimaximal neutrino mixing can arise. In particular, we describe one
recent model based on SUSY SU(5) combined with a family symmetry based on the
double tetrahedral group, T'. All 22 observable fermion masses and mixing
angles and CP violating measures are fitted with only 9 parameters. In this
model, a near tri-bimaximal MNS matrix and a realistic CKM matrix are
simultaneously generated; the MNS matrix gets slightly modified by virtue of
having the Georgi-Jarlskog relations. Due to the presence of complex
Clebsch-Gordan coefficients in T', CP violation in this model is entirely
geometrical in origin. The prediction of the model for the leptonic Dirac CP
phase is 227 degrees, which turns out to be very close to the current best fit
value of 220 degrees from SuperK.
|
[
{
"created": "Tue, 7 Dec 2010 21:00:00 GMT",
"version": "v1"
},
{
"created": "Thu, 9 Dec 2010 18:56:30 GMT",
"version": "v2"
}
] |
2015-03-17
|
[
[
"Chen",
"Mu-Chun",
""
],
[
"Mahanthappa",
"K. T.",
""
]
] |
We review recent developments in models of neutrino masses and mixing. Emphases are given to models based on finite group family symmetries from which the tri-bimaximal neutrino mixing can arise. In particular, we describe one recent model based on SUSY SU(5) combined with a family symmetry based on the double tetrahedral group, T'. All 22 observable fermion masses and mixing angles and CP violating measures are fitted with only 9 parameters. In this model, a near tri-bimaximal MNS matrix and a realistic CKM matrix are simultaneously generated; the MNS matrix gets slightly modified by virtue of having the Georgi-Jarlskog relations. Due to the presence of complex Clebsch-Gordan coefficients in T', CP violation in this model is entirely geometrical in origin. The prediction of the model for the leptonic Dirac CP phase is 227 degrees, which turns out to be very close to the current best fit value of 220 degrees from SuperK.
|
hep-ph/9509219
|
Jakub Rembielinski
|
J. Rembielinski
|
Quantization of the tachyonic field and the preferred frame
|
LaTeX2e or Latex 2.09, 24pp.; 2 references added, formulae (26),
(27), (31) corrected
| null | null | null |
hep-ph gr-qc hep-th
| null |
A consistent quantization scheme for imaginary-mass field is proposed. It is
related to an appropriate choice of the synchronization procedure (definition
of time), which guarantee an absolute causality in agreement with Lorentz
covariance. In that formulation a possible existence of field excitations
(tachyons) distinguish an inertial frame (tachyon privileged frame of
reference) {\em via} spontaneous breaking of the so called synchronization
group. In this scheme relativity principle is broken but Lorentz symmetry is
exactly preserved in agreement with local properties of the observed world.
|
[
{
"created": "Mon, 4 Sep 1995 20:45:26 GMT",
"version": "v1"
},
{
"created": "Fri, 15 Sep 1995 18:18:01 GMT",
"version": "v2"
}
] |
2008-02-03
|
[
[
"Rembielinski",
"J.",
""
]
] |
A consistent quantization scheme for imaginary-mass field is proposed. It is related to an appropriate choice of the synchronization procedure (definition of time), which guarantee an absolute causality in agreement with Lorentz covariance. In that formulation a possible existence of field excitations (tachyons) distinguish an inertial frame (tachyon privileged frame of reference) {\em via} spontaneous breaking of the so called synchronization group. In this scheme relativity principle is broken but Lorentz symmetry is exactly preserved in agreement with local properties of the observed world.
|
hep-ph/0208114
|
Michael Luke
|
Aida X. El-Khadra and Michael Luke
|
The Mass of the b Quark
|
54 pages, 5 figures. With permission from the Annual Review of
Nuclear & Particle Science. Final version of this material is scheduled to
appear in the Annual Review of Nuclear & Particle Science, Vol. 52, to be
published in December 2002 by Annual Reviews (http://AnnualReviews.org)
|
Ann.Rev.Nucl.Part.Sci.52:201-251,2002
|
10.1146/annurev.nucl.52.050102.090710
| null |
hep-ph
| null |
We review the current status of determinations of the b-quark mass, m_b. We
describe the theoretical tools required for determining m_b, with particular
emphasis on effective field theories both in the continuum and on the lattice.
We present several definitions of m_b and highlight their advantages and
disadvantages. Finally, we discuss the determinations of m_b from b-bar b
systems, b-flavored hadrons, and high-energy processes, with careful attention
to the corresponding theoretical uncertainties.
|
[
{
"created": "Mon, 12 Aug 2002 19:22:29 GMT",
"version": "v1"
}
] |
2008-11-26
|
[
[
"El-Khadra",
"Aida X.",
""
],
[
"Luke",
"Michael",
""
]
] |
We review the current status of determinations of the b-quark mass, m_b. We describe the theoretical tools required for determining m_b, with particular emphasis on effective field theories both in the continuum and on the lattice. We present several definitions of m_b and highlight their advantages and disadvantages. Finally, we discuss the determinations of m_b from b-bar b systems, b-flavored hadrons, and high-energy processes, with careful attention to the corresponding theoretical uncertainties.
|
hep-ph/0001212
|
Passarino Giampiero
|
G. Passarino (Turin Univ. and INFN Turin)
|
Single-W Production and Fermion-Loop Scheme: Numerical Results
|
27 pages(Latex), 7 figures
|
Nucl.Phys. B578 (2000) 3-26
|
10.1016/S0550-3213(00)00172-3
| null |
hep-ph hep-ex
| null |
The single-W production mechanism is synonymous to the electron-positron
annihilation into electron, neutrino and a W boson with the outgoing electron
lost in a small cone around the beam direction. It requires a Renormalization
Scheme that preserves gauge invariance and fermion masses cannot be neglected
in the calculation. A recently proposed generalization of the so-called
Fermion-Loop scheme is applied to the evaluation of observables at LEP 2
energies. Single-W processes are dominated by a regime of low momentum transfer
of the outgoing electron and any high-energy Renormalization Scheme fails to
give the correct description of the scale. The Fermion-Loop scheme
automatically converts all couplings of the theory into couplings that are
running at the appropriate scale. Therefore, in addition to represent the only
scheme fully justified on a field-theoretical basis, the Fermion-Loop is the
best starting point to include radiative corrections into single-W production.
Numerical results are presented, showing a decrease in the predictions that can
be sizeable. There is no naive and overall rescaling of the e.m. coupling
constant, in any pragmatic scheme, that can reproduce the Fermion-Loop results,
at the requested accuracy, for all configurations and for all kinematical cuts.
|
[
{
"created": "Thu, 20 Jan 2000 14:53:20 GMT",
"version": "v1"
}
] |
2009-10-31
|
[
[
"Passarino",
"G.",
"",
"Turin Univ. and INFN Turin"
]
] |
The single-W production mechanism is synonymous to the electron-positron annihilation into electron, neutrino and a W boson with the outgoing electron lost in a small cone around the beam direction. It requires a Renormalization Scheme that preserves gauge invariance and fermion masses cannot be neglected in the calculation. A recently proposed generalization of the so-called Fermion-Loop scheme is applied to the evaluation of observables at LEP 2 energies. Single-W processes are dominated by a regime of low momentum transfer of the outgoing electron and any high-energy Renormalization Scheme fails to give the correct description of the scale. The Fermion-Loop scheme automatically converts all couplings of the theory into couplings that are running at the appropriate scale. Therefore, in addition to represent the only scheme fully justified on a field-theoretical basis, the Fermion-Loop is the best starting point to include radiative corrections into single-W production. Numerical results are presented, showing a decrease in the predictions that can be sizeable. There is no naive and overall rescaling of the e.m. coupling constant, in any pragmatic scheme, that can reproduce the Fermion-Loop results, at the requested accuracy, for all configurations and for all kinematical cuts.
|
1502.05409
|
Daniel Stolarski
|
Pedro Schwaller, Daniel Stolarski, and Andreas Weiler
|
Emerging Jets
|
45 pages, 22 figures. v2: Typos fixed. v3: Minor modifications,
references added, version accepted in JHEP. Supplementary code can be found
at github.com/pedroschwaller/EmergingJets
| null |
10.1007/JHEP05(2015)059
|
CERN-PH-TH-2015-031, DESY 15-026
|
hep-ph hep-ex
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
In this work, we propose a novel search strategy for new physics at the LHC
that utilizes calorimeter jets that (i) are composed dominantly of displaced
tracks and (ii) have many different vertices within the jet cone. Such emerging
jet signatures are smoking guns for models with a composite dark sector where a
parton shower in the dark sector is followed by displaced decays of dark pions
back to SM jets. No current LHC searches are sensitive to this type of
phenomenology. We perform a detailed simulation for a benchmark signal with two
regular and two emerging jets, and present and implement strategies to suppress
QCD backgrounds by up to six orders of magnitude. At the 14 TeV LHC, this
signature can be probed with mediator masses as large as 1.5 TeV for a range of
dark pion lifetimes, and the reach is increased further at the high-luminosity
LHC. The emerging jet search is also sensitive to a broad class of long-lived
phenomena, and we show this for a supersymmetric model with R-parity violation.
Possibilities for discovery at LHCb are also discussed.
|
[
{
"created": "Wed, 18 Feb 2015 21:00:15 GMT",
"version": "v1"
},
{
"created": "Tue, 24 Feb 2015 14:04:15 GMT",
"version": "v2"
},
{
"created": "Mon, 11 May 2015 08:02:07 GMT",
"version": "v3"
}
] |
2015-05-19
|
[
[
"Schwaller",
"Pedro",
""
],
[
"Stolarski",
"Daniel",
""
],
[
"Weiler",
"Andreas",
""
]
] |
In this work, we propose a novel search strategy for new physics at the LHC that utilizes calorimeter jets that (i) are composed dominantly of displaced tracks and (ii) have many different vertices within the jet cone. Such emerging jet signatures are smoking guns for models with a composite dark sector where a parton shower in the dark sector is followed by displaced decays of dark pions back to SM jets. No current LHC searches are sensitive to this type of phenomenology. We perform a detailed simulation for a benchmark signal with two regular and two emerging jets, and present and implement strategies to suppress QCD backgrounds by up to six orders of magnitude. At the 14 TeV LHC, this signature can be probed with mediator masses as large as 1.5 TeV for a range of dark pion lifetimes, and the reach is increased further at the high-luminosity LHC. The emerging jet search is also sensitive to a broad class of long-lived phenomena, and we show this for a supersymmetric model with R-parity violation. Possibilities for discovery at LHCb are also discussed.
|
1605.09378
|
Antonio Racioppi
|
Kristjan Kannike, Antonio Racioppi and Martti Raidal
|
Super-Heavy Dark Matter - Towards Predictive Scenarios from Inflation
|
10 pages, 4 figures. Matches the published version on NPB
|
Nuclear Physics B 918 (2017) 162-177
|
10.1016/j.nuclphysb.2017.02.019
| null |
hep-ph astro-ph.CO gr-qc hep-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
A generic prediction of the Coleman-Weinberg inflation is the existence of a
heavy particle sector whose interactions with the inflaton, the lightest state
in this sector, generate the inflaton potential at loop level. For typical
interactions the heavy sector may contain stable states whose relic abundance
is generated at the end of inflation by the gravity alone. This general
feature, and the absence of any particle physics signal of dark matter so far,
motivates us to look for new directions in the dark sector physics, including
scenarios in which dark matter is super-heavy. In this article we study the
possibility that the dark matter is even heavier than the inflaton, its
existence follows from the inflaton dynamics, and its abundance today is {\it
naturally} determined by the weakness of gravitational interaction. This
implies that the super-heavy dark matter scenarios can be tested via the
measurements of inflationary parameters and/or the CMB isocurvature
perturbations and non-Gaussianities. We explicitly work out details of three
Coleman-Weinberg inflation scenarios, study the systematics of super-heavy dark
matter production in those cases, and compute which parts of the parameter
spaces can be probed by the future CMB measurements.
|
[
{
"created": "Mon, 30 May 2016 20:00:01 GMT",
"version": "v1"
},
{
"created": "Fri, 17 Mar 2017 15:24:53 GMT",
"version": "v2"
}
] |
2017-03-20
|
[
[
"Kannike",
"Kristjan",
""
],
[
"Racioppi",
"Antonio",
""
],
[
"Raidal",
"Martti",
""
]
] |
A generic prediction of the Coleman-Weinberg inflation is the existence of a heavy particle sector whose interactions with the inflaton, the lightest state in this sector, generate the inflaton potential at loop level. For typical interactions the heavy sector may contain stable states whose relic abundance is generated at the end of inflation by the gravity alone. This general feature, and the absence of any particle physics signal of dark matter so far, motivates us to look for new directions in the dark sector physics, including scenarios in which dark matter is super-heavy. In this article we study the possibility that the dark matter is even heavier than the inflaton, its existence follows from the inflaton dynamics, and its abundance today is {\it naturally} determined by the weakness of gravitational interaction. This implies that the super-heavy dark matter scenarios can be tested via the measurements of inflationary parameters and/or the CMB isocurvature perturbations and non-Gaussianities. We explicitly work out details of three Coleman-Weinberg inflation scenarios, study the systematics of super-heavy dark matter production in those cases, and compute which parts of the parameter spaces can be probed by the future CMB measurements.
|
2206.05965
|
Zhan Sun
|
Xuan Luo, Ying-Zhao Jiang, Gui-Yuan Zhang, and Zhan Sun
|
Doubly-charmed baryon production in $Z$ boson decay
|
v1: 14pages, 2 figures, and 1 table; v2: references added
| null | null | null |
hep-ph
|
http://creativecommons.org/licenses/by/4.0/
|
In this paper, we carry out a detailed study of doubly-charmed baryon
production in $Z$ boson decay, on the basis of the nonrelativistic QCD
factorization. With the inclusion of the di-quark states
$(cc)[^3S_1]_{\bar{\textbf{3}}}$ and $(cc)[^1S_0]_{{\textbf{6}}}$, the
branching ratio of $\mathcal{B}_{Z \to \Xi_{cc}+X}$ is predicted to be of the
$10^{-5}$ order, indicating its experimental measurability. By comparing to the
$\Lambda^{+}_{c}$ yield in $Z$ decay, we predict
$\mathcal{R}_{\Xi_{cc}^{+}}(=\frac{\Gamma(Z \to \Xi^{+}_{cc}) \times
\mathcal{B}(\Xi^{+}_{cc} \to \Lambda_c^{+}K^{-}\pi^{+})}{\Gamma(Z \to
\Lambda_c^{+})})=(0.85^{+0.10}_{-0.07}) \times 10^{-4}$ and
$\mathcal{R}_{\Xi_{cc}^{++}}(=\frac{\Gamma(Z \to \Xi^{++}_{cc}) \times
\mathcal{B}(\Xi^{++}_{cc} \to \Lambda_c^{+}K^{-}\pi^{+}\pi^{+})}{\Gamma(Z \to
\Lambda_c^{+})})=(1.70^{+0.20}_{-0.14}) \times 10^{-4}$, which are at clear
variance with the SELEX measurements but comparable with the values given by
the LHCb and Belle collaborations.
|
[
{
"created": "Mon, 13 Jun 2022 08:25:38 GMT",
"version": "v1"
},
{
"created": "Tue, 14 Jun 2022 12:16:35 GMT",
"version": "v2"
}
] |
2022-06-15
|
[
[
"Luo",
"Xuan",
""
],
[
"Jiang",
"Ying-Zhao",
""
],
[
"Zhang",
"Gui-Yuan",
""
],
[
"Sun",
"Zhan",
""
]
] |
In this paper, we carry out a detailed study of doubly-charmed baryon production in $Z$ boson decay, on the basis of the nonrelativistic QCD factorization. With the inclusion of the di-quark states $(cc)[^3S_1]_{\bar{\textbf{3}}}$ and $(cc)[^1S_0]_{{\textbf{6}}}$, the branching ratio of $\mathcal{B}_{Z \to \Xi_{cc}+X}$ is predicted to be of the $10^{-5}$ order, indicating its experimental measurability. By comparing to the $\Lambda^{+}_{c}$ yield in $Z$ decay, we predict $\mathcal{R}_{\Xi_{cc}^{+}}(=\frac{\Gamma(Z \to \Xi^{+}_{cc}) \times \mathcal{B}(\Xi^{+}_{cc} \to \Lambda_c^{+}K^{-}\pi^{+})}{\Gamma(Z \to \Lambda_c^{+})})=(0.85^{+0.10}_{-0.07}) \times 10^{-4}$ and $\mathcal{R}_{\Xi_{cc}^{++}}(=\frac{\Gamma(Z \to \Xi^{++}_{cc}) \times \mathcal{B}(\Xi^{++}_{cc} \to \Lambda_c^{+}K^{-}\pi^{+}\pi^{+})}{\Gamma(Z \to \Lambda_c^{+})})=(1.70^{+0.20}_{-0.14}) \times 10^{-4}$, which are at clear variance with the SELEX measurements but comparable with the values given by the LHCb and Belle collaborations.
|
1911.03370
|
Babak Salehi Kasmaei
|
Babak Salehi Kasmaei and Michael Strickland
|
Photon production and elliptic flow from momentum-anisotropic
quark-gluon plasma
|
19 pages, 10 figures
|
Phys. Rev. D 102, 014037 (2020)
|
10.1103/PhysRevD.102.014037
| null |
hep-ph nucl-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
The emission of real photons from a momentum-anisotropic quark-gluon plasma
(QGP) is affected by both the collective flow of the radiating medium and the
modification of local rest frame emission rate due to the anisotropic momentum
distribution of partonic degrees of freedom. In this paper, we first calculate
the photon production rate from an ellipsoidally momentum-anisotropic QGP
including hard contributions from Compton scattering and quark pair
annihilation and soft contribution calculated using the hard thermal loop (HTL)
approximation. We introduce a parametrization of the nonequilibrium rate in
order to facilitate its further application in yield and flow calculations. We
convolve the anisotropic photon rate with the space-time evolution of QGP
provided by 3+1d anisotropic hydrodynamics (aHydro) to obtain the yield and the
elliptic flow coefficient $v_2$ of photons from QGP generated at Pb-Pb
collisions at LHC at 2.76 TeV and Au-Au collisions at RHIC at 200 GeV. We
investigate the effects of various parameters on the results. In particular we
analyze the sensitivity of results to initial momentum anisotropy.
|
[
{
"created": "Fri, 8 Nov 2019 16:51:05 GMT",
"version": "v1"
}
] |
2020-07-29
|
[
[
"Kasmaei",
"Babak Salehi",
""
],
[
"Strickland",
"Michael",
""
]
] |
The emission of real photons from a momentum-anisotropic quark-gluon plasma (QGP) is affected by both the collective flow of the radiating medium and the modification of local rest frame emission rate due to the anisotropic momentum distribution of partonic degrees of freedom. In this paper, we first calculate the photon production rate from an ellipsoidally momentum-anisotropic QGP including hard contributions from Compton scattering and quark pair annihilation and soft contribution calculated using the hard thermal loop (HTL) approximation. We introduce a parametrization of the nonequilibrium rate in order to facilitate its further application in yield and flow calculations. We convolve the anisotropic photon rate with the space-time evolution of QGP provided by 3+1d anisotropic hydrodynamics (aHydro) to obtain the yield and the elliptic flow coefficient $v_2$ of photons from QGP generated at Pb-Pb collisions at LHC at 2.76 TeV and Au-Au collisions at RHIC at 200 GeV. We investigate the effects of various parameters on the results. In particular we analyze the sensitivity of results to initial momentum anisotropy.
|
1207.6390
|
Bhubanjyoti Bhattacharya
|
Bhubanjyoti Bhattacharya, Michael Gronau, Jonathan L. Rosner
|
Nonleptonic Charm Decays and CP Violation
|
16 pages, 5 figures, to appear in the proceedings of The 5th
International Workshop on Charm Physics (Charm 2012), 14-17 May 2012,
Honolulu, Hawai'i 96822
| null | null |
UdeM-GPP-TH-12-211; EFI 12-19; TECHNION-PH-12-11
|
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
In this talk we briefly present a flavor-SU(3) technique to study branching
ratios and direct CP asymmetries $D$-meson decays. The first part of the talk
is meant to set up a foundation, based on previous work, to deal with
flavor-SU(3) amplitudes and relative strong phases. In addition, we present a
model for dealing with SU(3)-breaking in branching ratio measurements of SCS
$D^0$ decays. In the second part of the talk we make use of a proposal for an
enhanced CP-violating penguin in the SM, to explain the recent LHCb and CDF
observations of CP violation in SCS $D^0$ decays. Furthermore, we use our model
to predict CP violation in $\pi^0\pi^0$ and $K^+\bar{K}^0$ final states. Large
experimental bounds on individual CP asymmetries give rise to a large allowed
range of $\delta$, the strong phase of the CP-violating penguin. We also
briefly discuss future prospects.
|
[
{
"created": "Thu, 26 Jul 2012 19:55:33 GMT",
"version": "v1"
},
{
"created": "Sun, 5 Aug 2012 23:24:24 GMT",
"version": "v2"
}
] |
2012-08-07
|
[
[
"Bhattacharya",
"Bhubanjyoti",
""
],
[
"Gronau",
"Michael",
""
],
[
"Rosner",
"Jonathan L.",
""
]
] |
In this talk we briefly present a flavor-SU(3) technique to study branching ratios and direct CP asymmetries $D$-meson decays. The first part of the talk is meant to set up a foundation, based on previous work, to deal with flavor-SU(3) amplitudes and relative strong phases. In addition, we present a model for dealing with SU(3)-breaking in branching ratio measurements of SCS $D^0$ decays. In the second part of the talk we make use of a proposal for an enhanced CP-violating penguin in the SM, to explain the recent LHCb and CDF observations of CP violation in SCS $D^0$ decays. Furthermore, we use our model to predict CP violation in $\pi^0\pi^0$ and $K^+\bar{K}^0$ final states. Large experimental bounds on individual CP asymmetries give rise to a large allowed range of $\delta$, the strong phase of the CP-violating penguin. We also briefly discuss future prospects.
|
hep-ph/9501257
|
Yong Yeon Keum
|
M. Gourdin, Y. Y. Keum and X. Y. Pham
|
Factorization and SU(2) Heavy Flavor Symmetry for B-Meson Decays
Producing Charmonium
|
35 pages ( Latex ) with 10 figures (available by request)
|
Phys.Rev. D52 (1995) 1597-1613
|
10.1103/PhysRevD.52.1597
|
PAR/LPTHE/95-01
|
hep-ph
| null |
We show that the factorization assumption in color-suppressed $B$ meson
decays is not ruled out by experimental data on $B \ra K(K^*) +
J/\Psi(\Psi^{'})$. The problem previously pointed out might be due to an
inadequate choice of hadronic form factors. Within the Isgur-Wise SU(2) heavy
flavor symmetry framework, we search for possible $q^2$ dependence of form
factors that are capable of explaining simultaneously the large longitudinal
polarization $\rho_L$ observed in $B \ra K^* + J/\Psi$ and the relatively small
ratio of rates $R_{J/\Psi} = \Gamma(B \ra K^* + J/\Psi)/\Gamma(B \ra K +
J/\Psi)$. We find out that the puzzle could be essentially understood if the
$A_1(q^2)$ form factor is frankly decreasing, instead of being almost constant
or increasing as commonly assumed. Of course, the possibility of understanding
experimental data is not necessarily a proof of factorization.
|
[
{
"created": "Tue, 10 Jan 1995 16:32:44 GMT",
"version": "v1"
}
] |
2016-09-01
|
[
[
"Gourdin",
"M.",
""
],
[
"Keum",
"Y. Y.",
""
],
[
"Pham",
"X. Y.",
""
]
] |
We show that the factorization assumption in color-suppressed $B$ meson decays is not ruled out by experimental data on $B \ra K(K^*) + J/\Psi(\Psi^{'})$. The problem previously pointed out might be due to an inadequate choice of hadronic form factors. Within the Isgur-Wise SU(2) heavy flavor symmetry framework, we search for possible $q^2$ dependence of form factors that are capable of explaining simultaneously the large longitudinal polarization $\rho_L$ observed in $B \ra K^* + J/\Psi$ and the relatively small ratio of rates $R_{J/\Psi} = \Gamma(B \ra K^* + J/\Psi)/\Gamma(B \ra K + J/\Psi)$. We find out that the puzzle could be essentially understood if the $A_1(q^2)$ form factor is frankly decreasing, instead of being almost constant or increasing as commonly assumed. Of course, the possibility of understanding experimental data is not necessarily a proof of factorization.
|
2204.04805
|
Lingfeng Li
|
JiJi Fan, Lingfeng Li, Tao Liu, Kun-Feng Lyu
|
$W$-Boson Mass, Electroweak Precision Tests and SMEFT
|
8 pages, 3 figures, version accepted by PRD for publication
| null |
10.1103/PhysRevD.106.073010
| null |
hep-ph hep-ex
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Recently the CDF collaboration at the Tevatron reported a significant
discrepancy between the direct measurement of the $W$-boson mass and its
Standard Model (SM) prediction based on electroweak precision tests (EWPTs). In
this paper we explore the potential origin of this discrepancy from physics
beyond the SM. Explicitly, we work on a set of six-dimensional operators in the
SM effective field theory (SMEFT) which are relevant to the EWPTs. By fitting
to the data, we demonstrate that an upward shift in $m_W$ is driven by the
operator
$\mathcal{O}_{T}=\frac{1}{2}(H^{\dagger}\overset{\text{$\leftrightarrow$}}{D}_{\mu}H)^2$
with a coefficient $c_T ({\rm TeV}/\Lambda)^2 \gtrsim 0.01$. This suggests that
the new physics scale favored by the CDF data should be multiple TeV for
tree-level effects and sub TeV for loop-level effects. One simple example is to
introduce a hypercharge-free electroweak triplet scalar which can raise the
$c_T$ value at tree level. We also study the potential to further test the
relevant SMEFT by measuring Higgs-coupling, $m_W$ and other EWPTs at future
circular $e^-e^+$ colliders.
|
[
{
"created": "Mon, 11 Apr 2022 00:31:30 GMT",
"version": "v1"
},
{
"created": "Tue, 1 Nov 2022 21:57:41 GMT",
"version": "v2"
}
] |
2022-11-09
|
[
[
"Fan",
"JiJi",
""
],
[
"Li",
"Lingfeng",
""
],
[
"Liu",
"Tao",
""
],
[
"Lyu",
"Kun-Feng",
""
]
] |
Recently the CDF collaboration at the Tevatron reported a significant discrepancy between the direct measurement of the $W$-boson mass and its Standard Model (SM) prediction based on electroweak precision tests (EWPTs). In this paper we explore the potential origin of this discrepancy from physics beyond the SM. Explicitly, we work on a set of six-dimensional operators in the SM effective field theory (SMEFT) which are relevant to the EWPTs. By fitting to the data, we demonstrate that an upward shift in $m_W$ is driven by the operator $\mathcal{O}_{T}=\frac{1}{2}(H^{\dagger}\overset{\text{$\leftrightarrow$}}{D}_{\mu}H)^2$ with a coefficient $c_T ({\rm TeV}/\Lambda)^2 \gtrsim 0.01$. This suggests that the new physics scale favored by the CDF data should be multiple TeV for tree-level effects and sub TeV for loop-level effects. One simple example is to introduce a hypercharge-free electroweak triplet scalar which can raise the $c_T$ value at tree level. We also study the potential to further test the relevant SMEFT by measuring Higgs-coupling, $m_W$ and other EWPTs at future circular $e^-e^+$ colliders.
|
1710.02719
|
Dmitri Melikhov
|
Dmitri Melikhov, Anastasiia Kozachuk, Nikolai Nikitin
|
Rare FCNC radiative leptonic decays $B\to\gamma\ell^+\ell^-$
|
6 pages, talk given at "The European Physical Society Conference on
High Energy Physics - EPS-HEP 2017" (5 - 12 July 2017, Venice, Italy)
|
PoS (EPS-HEP2017) 228
| null | null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We present our recent results for long-distance QCD effects in the FCNC
radiative leptonic decays $B\to\gamma\ell^+\ell^-$, $\ell=\{e,\mu\}$. One
encounters here two distinct types of long-distance effects: those encoded in
the $B\to\gamma$ transition form factors induced by the $b\to q$ quark
currents, and those related to the charm-loop effects. We calculate the
$B\to\gamma$ form factors in a broad range of the momentum transfers making use
of the relativisitc dispersion approach based on the constituent quark picture
which has proven to provide reliable predictions for many weak-transition form
factors. Concerning the description of the charm-loop contributions, we point
out two observations: First, the precise description of the charmonium
resonances, in particular, the relative phases between $\psi$ and $\psi'$, has
impact on the differential distributions and on the forward-backward asymmetry,
$A_{\rm FB}$, in a broad range of $q^2\ge 5$ GeV$^2$. Second, the shape of
$A_{\rm FB}$ in $B\to\gamma\ell^+\ell^-$ and in $B\to V\ell^+\ell^-$ ($V$ the
vector meson) {\it in the $q^2$-region between $\psi$ and $\psi'$} provides an
unambiguous probe of the relative phases between $\psi$ and $\psi'$. Fixing the
latter will lead to a strong reduction of the theoretical uncertainties in
$A_{\rm FB}$ at $q^2=5-9$ GeV$^2$ where it has the sensitivity to physics
beyond the SM.
|
[
{
"created": "Sat, 7 Oct 2017 18:46:59 GMT",
"version": "v1"
}
] |
2017-10-10
|
[
[
"Melikhov",
"Dmitri",
""
],
[
"Kozachuk",
"Anastasiia",
""
],
[
"Nikitin",
"Nikolai",
""
]
] |
We present our recent results for long-distance QCD effects in the FCNC radiative leptonic decays $B\to\gamma\ell^+\ell^-$, $\ell=\{e,\mu\}$. One encounters here two distinct types of long-distance effects: those encoded in the $B\to\gamma$ transition form factors induced by the $b\to q$ quark currents, and those related to the charm-loop effects. We calculate the $B\to\gamma$ form factors in a broad range of the momentum transfers making use of the relativisitc dispersion approach based on the constituent quark picture which has proven to provide reliable predictions for many weak-transition form factors. Concerning the description of the charm-loop contributions, we point out two observations: First, the precise description of the charmonium resonances, in particular, the relative phases between $\psi$ and $\psi'$, has impact on the differential distributions and on the forward-backward asymmetry, $A_{\rm FB}$, in a broad range of $q^2\ge 5$ GeV$^2$. Second, the shape of $A_{\rm FB}$ in $B\to\gamma\ell^+\ell^-$ and in $B\to V\ell^+\ell^-$ ($V$ the vector meson) {\it in the $q^2$-region between $\psi$ and $\psi'$} provides an unambiguous probe of the relative phases between $\psi$ and $\psi'$. Fixing the latter will lead to a strong reduction of the theoretical uncertainties in $A_{\rm FB}$ at $q^2=5-9$ GeV$^2$ where it has the sensitivity to physics beyond the SM.
|
1511.06039
|
Simone Marzani
|
Simone Marzani
|
Combining $Q_T$ and small-$x$ resummations
|
Corrected a mistake in Eq.(40)
|
Phys. Rev. D 93, 054047 (2016)
|
10.1103/PhysRevD.93.054047
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We analyze transverse momentum ($Q_T$) resummation of a colorless final
state, e.g. Higgs production in gluon fusion or the production of a lepton pair
via the Drell-Yan mechanism, in the limit where the invariant mass of the final
state is much less then the center-of-mass energy, i.e. $Q^2\ll s$. We show how
the traditional resummation of logarithms of $Q_T/Q$ can be supplemented with
the resummation of the leading logarithmic contributions at small $x=Q^2/s$ and
we compute the necessary ingredients to perform such joint resummation.
|
[
{
"created": "Thu, 19 Nov 2015 01:28:05 GMT",
"version": "v1"
},
{
"created": "Thu, 24 Mar 2016 16:37:13 GMT",
"version": "v2"
},
{
"created": "Sat, 12 Nov 2016 15:42:23 GMT",
"version": "v3"
},
{
"created": "Fri, 11 Dec 2020 09:56:27 GMT",
"version": "v4"
}
] |
2020-12-14
|
[
[
"Marzani",
"Simone",
""
]
] |
We analyze transverse momentum ($Q_T$) resummation of a colorless final state, e.g. Higgs production in gluon fusion or the production of a lepton pair via the Drell-Yan mechanism, in the limit where the invariant mass of the final state is much less then the center-of-mass energy, i.e. $Q^2\ll s$. We show how the traditional resummation of logarithms of $Q_T/Q$ can be supplemented with the resummation of the leading logarithmic contributions at small $x=Q^2/s$ and we compute the necessary ingredients to perform such joint resummation.
|
hep-ph/9407232
|
Dietrich Lehner
|
D. Lehner
|
Initial State Radiation to Off-shell $\Z^0$ Pair Production in $e^+e^-$
Annihilation
|
6 pages (LaTeX), 2 figures (not included, a uuencoded file containing
the LaTeX and all postscript files is available via anonymous ftp from
convex.ifh.de as /pub/preprint/desy94-105.uu), DESY 94-105
|
Mod. Phys. Lett. A9 (1994) 2937
|
10.1142/S021773239400277X
| null |
hep-ph
| null |
A study of the Standard Model reaction $\e^+e^- \rightarrow (\Z^0\Z^0)
\rightarrow f_1\bar{f_1}f_2\bar{f_2}$ including the effects of the finite
$\Z^0$~width and initial state radiative corrections is presented. All angular
phase space integrations are performed analytically. The remaining invariant
masses are integrated numerically. Semi-analytical and numerical results in the
energy range $\RS=200\;GeV$ to $1\;TeV$ are reported.
|
[
{
"created": "Tue, 5 Jul 1994 19:26:21 GMT",
"version": "v1"
}
] |
2015-06-25
|
[
[
"Lehner",
"D.",
""
]
] |
A study of the Standard Model reaction $\e^+e^- \rightarrow (\Z^0\Z^0) \rightarrow f_1\bar{f_1}f_2\bar{f_2}$ including the effects of the finite $\Z^0$~width and initial state radiative corrections is presented. All angular phase space integrations are performed analytically. The remaining invariant masses are integrated numerically. Semi-analytical and numerical results in the energy range $\RS=200\;GeV$ to $1\;TeV$ are reported.
|
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