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|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
hep-ph/9708276
| null |
J. O. Andersen
|
The Screening Mass Squared in Hot Scalar Theory to Order $g^5$ Using
Effective Field Theory
|
14 pages, LATEX, 5 figures. Replaces incorrect version sent august 7
|
Phys.Rev. D57 (1998) 5004-5009
|
10.1103/PhysRevD.57.5004
|
OSLO-TP 9-97
|
hep-ph
| null |
We study massless $g^2\Phi^4$-theory at high temperature and with zero
chemical potential. Using modern effective field theory methods,% recently
developed by Braaten and Nieto, we derive the screening mass squared to order
$g^5$. It is demonstrated that the result is renormalization group invariant to
this order in the coupling constant. Renormalization group methods are used to
sum up leading logarithms of $g$.
|
[
{
"created": "Thu, 7 Aug 1997 13:03:42 GMT",
"version": "v1"
},
{
"created": "Mon, 25 Aug 1997 13:43:06 GMT",
"version": "v2"
}
] |
2009-10-30
|
[
[
"Andersen",
"J. O.",
""
]
] |
We study massless $g^2\Phi^4$-theory at high temperature and with zero chemical potential. Using modern effective field theory methods,% recently developed by Braaten and Nieto, we derive the screening mass squared to order $g^5$. It is demonstrated that the result is renormalization group invariant to this order in the coupling constant. Renormalization group methods are used to sum up leading logarithms of $g$.
|
0710.3348
|
Johannes Bluemlein
|
I. Bierenbaum, J. Bl\"umlein and S. Klein
|
Heavy Flavour Production in Deep--Inelastic Scattering - Two--Loop
Massive Operator Matrix Elements and Beyond
|
Proc. XXXI International Conference of Theoretical Physics: Matter To
The Deepest, Ustron, Poland, 5-11 September 2007
|
Acta Phys.Polon.B38:3543-3550,2007; PoS RADCOR2007:034,2007
| null |
DESY 07-096, SFB/CPP-07-71
|
hep-ph
| null |
We calculate the O($\eps$)--term of the two--loop massive operator matrix
elements for twist 2--operators, which contribute to the heavy flavour Wilson
coefficients in unpolarized deep--inelastic scattering in the asymptotic limit
$Q^2 \gg m^2.$ Our calculation was performed in Mellin space using
Mellin--Barnes integrals and generalized hypergeometric functions. The
O($\eps$)--term contributes in the renormalization at 3--loop order.
|
[
{
"created": "Wed, 17 Oct 2007 16:34:16 GMT",
"version": "v1"
},
{
"created": "Thu, 18 Oct 2007 18:42:19 GMT",
"version": "v2"
}
] |
2009-01-07
|
[
[
"Bierenbaum",
"I.",
""
],
[
"Blümlein",
"J.",
""
],
[
"Klein",
"S.",
""
]
] |
We calculate the O($\eps$)--term of the two--loop massive operator matrix elements for twist 2--operators, which contribute to the heavy flavour Wilson coefficients in unpolarized deep--inelastic scattering in the asymptotic limit $Q^2 \gg m^2.$ Our calculation was performed in Mellin space using Mellin--Barnes integrals and generalized hypergeometric functions. The O($\eps$)--term contributes in the renormalization at 3--loop order.
|
hep-ph/0606239
|
Hong Mao
|
Hong Mao, Ru-Keng Su, Wei-Qin Zhao
|
Soliton solutions of the improved quark mass density-dependent model at
finite temperature
|
10 pages, 9 figures; Version to appear in Physical Review C
|
Phys.Rev. C74 (2006) 055204
|
10.1103/PhysRevC.74.055204
| null |
hep-ph nucl-th
| null |
The improved quark mass density-dependent model (IQMDD) based on soliton bag
model is studied at finite temperature. Appling the finite temperature field
theory, the effective potential of the IQMDD model and the bag constant $B(T)$
have been calculated at different temperatures. It is shown that there is a
critical temperature $T_{C}\simeq 110 \mathrm{MeV}$. We also calculate the
soliton solutions of the IQMDD model at finite tmperature. It turns out that
when $T<T_{C}$, there is a bag constant $B(T)$ and the soliton solutions are
stable. However, when $T>T_{C}$ the bag constant $B(T)=0$ and there is no
soliton solution, therefore, the confinement of quarks are removed quickly.
|
[
{
"created": "Thu, 22 Jun 2006 10:56:58 GMT",
"version": "v1"
},
{
"created": "Tue, 3 Oct 2006 03:16:49 GMT",
"version": "v2"
}
] |
2007-05-23
|
[
[
"Mao",
"Hong",
""
],
[
"Su",
"Ru-Keng",
""
],
[
"Zhao",
"Wei-Qin",
""
]
] |
The improved quark mass density-dependent model (IQMDD) based on soliton bag model is studied at finite temperature. Appling the finite temperature field theory, the effective potential of the IQMDD model and the bag constant $B(T)$ have been calculated at different temperatures. It is shown that there is a critical temperature $T_{C}\simeq 110 \mathrm{MeV}$. We also calculate the soliton solutions of the IQMDD model at finite tmperature. It turns out that when $T<T_{C}$, there is a bag constant $B(T)$ and the soliton solutions are stable. However, when $T>T_{C}$ the bag constant $B(T)=0$ and there is no soliton solution, therefore, the confinement of quarks are removed quickly.
|
1305.5010
|
Rumin Wang
|
Yuan-Guo Xu, Li-Hai Zhou, Bing-Zhong Li, Ru-Min Wang
|
Analysis of $B_s\to \phi\mu^+\mu^-$ decay within supersymmetry
|
12 pages, 4 figures
| null |
10.1088/1674-1137/37/6/063104
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Motivated by the first measurement on $\mathcal{B}(B_s\to\phi \mu^+\mu^-)$ by
the CDF Collaboration, we study the supersymmetric effects in semi-leptonic
$B_s\to\phi\mu^+\mu^-$ decay. In our evaluations, we analyze the dependences of
the dimuon invariant mass spectrum and the forward-backward asymmetry on
relevant supersymmetric couplings in the MSSM with and without R-parity. The
analyses show the new experimental upper limits of
$\mathcal{B}(B_s\to\mu^+\mu^-)$ from the LHCb Collaboration could further
improve the bounds on sneutrino exchange couplings and $(\delta^u_{LL})_{23}$
as well as $(\delta^d_{LL,RR})_{23}$ mass insertion couplings. In addition,
within the allowed ranges of relevant couplings under the constraints from
$\mathcal{B}(B_s\to\phi \mu^+\mu^-)$, $\mathcal{B}(B\to K^{(*)}\mu^+\mu^-)$ and
$\mathcal{B}(B_s\to \mu^+\mu^-)$, the dimuon forward-backward asymmetry and the
differential dimuon forward-backward asymmetry of $B_s\to\phi\mu^+\mu^-$ are
highly sensitive to the squark exchange contribution and the
$(\delta^u_{LL})_{23}$ mass insertion contribution. The results obtained in
this work will be very useful in searching supersymmetric signal at the LHC.
|
[
{
"created": "Wed, 22 May 2013 03:33:40 GMT",
"version": "v1"
}
] |
2015-06-16
|
[
[
"Xu",
"Yuan-Guo",
""
],
[
"Zhou",
"Li-Hai",
""
],
[
"Li",
"Bing-Zhong",
""
],
[
"Wang",
"Ru-Min",
""
]
] |
Motivated by the first measurement on $\mathcal{B}(B_s\to\phi \mu^+\mu^-)$ by the CDF Collaboration, we study the supersymmetric effects in semi-leptonic $B_s\to\phi\mu^+\mu^-$ decay. In our evaluations, we analyze the dependences of the dimuon invariant mass spectrum and the forward-backward asymmetry on relevant supersymmetric couplings in the MSSM with and without R-parity. The analyses show the new experimental upper limits of $\mathcal{B}(B_s\to\mu^+\mu^-)$ from the LHCb Collaboration could further improve the bounds on sneutrino exchange couplings and $(\delta^u_{LL})_{23}$ as well as $(\delta^d_{LL,RR})_{23}$ mass insertion couplings. In addition, within the allowed ranges of relevant couplings under the constraints from $\mathcal{B}(B_s\to\phi \mu^+\mu^-)$, $\mathcal{B}(B\to K^{(*)}\mu^+\mu^-)$ and $\mathcal{B}(B_s\to \mu^+\mu^-)$, the dimuon forward-backward asymmetry and the differential dimuon forward-backward asymmetry of $B_s\to\phi\mu^+\mu^-$ are highly sensitive to the squark exchange contribution and the $(\delta^u_{LL})_{23}$ mass insertion contribution. The results obtained in this work will be very useful in searching supersymmetric signal at the LHC.
|
hep-ph/9712441
|
Carlo Giunti
|
W.M. Alberico, M.B. Barbaro, S.M. Bilenky, J.A. Caballero, C. Giunti,
C. Maieron, E. Moya de Guerra, J.M. Udias
|
The ratio of p and n yields in NC neutrino(antineutrino)-nucleus
scattering and strange form factors of the nucleon
|
8 pages, including 2 figures. Final version to be published in Phys.
Lett. B
|
Phys.Lett. B438 (1998) 9-13
|
10.1016/S0370-2693(98)01043-0
|
DFTT 70/97
|
hep-ph nucl-th
| null |
We calculate the ratio of proton and neutron yields in NC induced
neutrino(antineutrino)-nucleus inelastic scattering at neutrino energies of
about 1 GeV. We show that this ratio depends very weakly on the nuclear models
employed and that in the neutrino and antineutrino cases the ratios have
different sensitivity to the axial and vector strange form factors; moreover,
the ratio of antineutrino--nucleus cross sections turns out to be rather
sensitive to the electric strange form factor. We demonstrate that measurements
of these ratios will allow to get information on the strange form factors of
the nucleon in the region Q > 0.4 GeV^2.
|
[
{
"created": "Thu, 18 Dec 1997 14:15:10 GMT",
"version": "v1"
},
{
"created": "Thu, 6 Aug 1998 13:06:44 GMT",
"version": "v2"
}
] |
2009-10-30
|
[
[
"Alberico",
"W. M.",
""
],
[
"Barbaro",
"M. B.",
""
],
[
"Bilenky",
"S. M.",
""
],
[
"Caballero",
"J. A.",
""
],
[
"Giunti",
"C.",
""
],
[
"Maieron",
"C.",
""
],
[
"de Guerra",
"E. Moya",
""
],
[
"Udias",
"J. M.",
""
]
] |
We calculate the ratio of proton and neutron yields in NC induced neutrino(antineutrino)-nucleus inelastic scattering at neutrino energies of about 1 GeV. We show that this ratio depends very weakly on the nuclear models employed and that in the neutrino and antineutrino cases the ratios have different sensitivity to the axial and vector strange form factors; moreover, the ratio of antineutrino--nucleus cross sections turns out to be rather sensitive to the electric strange form factor. We demonstrate that measurements of these ratios will allow to get information on the strange form factors of the nucleon in the region Q > 0.4 GeV^2.
|
hep-ph/9905528
|
Yeong Gyun Kim
|
C. S. Kim, Yeong Gyun Kim (Yonsei U.), T. Morozumi (Hiroshima U.)
|
New Physics Effects in $B \to K^(*) \nu \nu$ Decays
|
20 pages with 7 figures
|
Phys.Rev. D60 (1999) 094007
|
10.1103/PhysRevD.60.094007
|
YUMS 99-011, HUPD 9905
|
hep-ph
| null |
We present a model-independent analysis of rare B decays, $B \to K^{(*)} \nu
\nu$. The effect of possible new physics is written in terms of dimension-6
four-fermi interactions. The lepton number violating scalar- and tensor-type
interactions are included, and they induce $B \to K^{(*)} \nu \nu ({\bar \nu}
{\bar \nu})$ decays. We show systematically how the branching ratios and
missing mass-squared spectrum depend on the coefficients of the four-fermi
interactions.
|
[
{
"created": "Fri, 28 May 1999 07:26:28 GMT",
"version": "v1"
}
] |
2009-10-31
|
[
[
"Kim",
"C. S.",
"",
"Yonsei U."
],
[
"Kim",
"Yeong Gyun",
"",
"Yonsei U."
],
[
"Morozumi",
"T.",
"",
"Hiroshima U."
]
] |
We present a model-independent analysis of rare B decays, $B \to K^{(*)} \nu \nu$. The effect of possible new physics is written in terms of dimension-6 four-fermi interactions. The lepton number violating scalar- and tensor-type interactions are included, and they induce $B \to K^{(*)} \nu \nu ({\bar \nu} {\bar \nu})$ decays. We show systematically how the branching ratios and missing mass-squared spectrum depend on the coefficients of the four-fermi interactions.
|
hep-ph/9807278
| null |
David H. Lyth (Lancaster) and Antonio Riotto (CERN/Oxford)
|
Particle Physics Models of Inflation and the Cosmological Density
Perturbation
|
156 pages, after final proof corrections and additions
|
Phys.Rept.314:1-146,1999
|
10.1016/S0370-1573(98)00128-8
| null |
hep-ph astro-ph gr-qc hep-th
| null |
This is a review of particle-theory models of inflation, and of their
predictions for the primordial density perturbation that is thought to be the
origin of structure in the Universe. It contains mini-reviews of the relevant
observational cosmology, of elementary field theory and of supersymmetry, that
may be of interest in their own right. The spectral index $n(k)$, specifying
the scale-dependence of the spectrum of the curvature perturbation, will be a
powerful discriminator between models, when it is measured by Planck with
accuracy $\Delta n\sim 0.01$. The usual formula for $n$ is derived, as well as
its less familiar extension to the case of a multi-component inflaton; in both
cases the key ingredient is the separate evolution of causally disconnected
regions of the Universe. Primordial gravitational waves will be an even more
powerful discriminator if they are observed, since most models of inflation
predict that they are completely negligible. We treat in detail the new wave of
models, which are firmly rooted in modern particle theory and have
supersymmetry as a crucial ingredient. The review is addressed to both
astrophysicists and particle physicists, and each section is fairly homogeneous
regarding the assumed background knowledge.
|
[
{
"created": "Tue, 7 Jul 1998 14:37:00 GMT",
"version": "v1"
},
{
"created": "Fri, 14 Aug 1998 17:20:30 GMT",
"version": "v2"
},
{
"created": "Mon, 26 Oct 1998 18:48:25 GMT",
"version": "v3"
},
{
"created": "Tue, 16 Mar 1999 13:17:32 GMT",
"version": "v4"
}
] |
2009-06-19
|
[
[
"Lyth",
"David H.",
"",
"Lancaster"
],
[
"Riotto",
"Antonio",
"",
"CERN/Oxford"
]
] |
This is a review of particle-theory models of inflation, and of their predictions for the primordial density perturbation that is thought to be the origin of structure in the Universe. It contains mini-reviews of the relevant observational cosmology, of elementary field theory and of supersymmetry, that may be of interest in their own right. The spectral index $n(k)$, specifying the scale-dependence of the spectrum of the curvature perturbation, will be a powerful discriminator between models, when it is measured by Planck with accuracy $\Delta n\sim 0.01$. The usual formula for $n$ is derived, as well as its less familiar extension to the case of a multi-component inflaton; in both cases the key ingredient is the separate evolution of causally disconnected regions of the Universe. Primordial gravitational waves will be an even more powerful discriminator if they are observed, since most models of inflation predict that they are completely negligible. We treat in detail the new wave of models, which are firmly rooted in modern particle theory and have supersymmetry as a crucial ingredient. The review is addressed to both astrophysicists and particle physicists, and each section is fairly homogeneous regarding the assumed background knowledge.
|
0711.2636
|
Peter Marquard
|
A. Maier, P. Maierhoefer and P. Marquard
|
Higher Moments of Heavy Quark Correlators in the Low Energy Limit at
O(alpha_s^2)
|
32 pages, 7 figures
|
Nucl.Phys.B797:218-242,2008
|
10.1016/j.nuclphysb.2007.12.035
|
TTP07-32, SFB/CPP-07-76
|
hep-ph
| null |
We present the first 30 moments of the low energy expansions of the vector,
axial-vector, scalar and pseudo-scalar heavy quark correlation functions at
three-loop order, including the singlet contribution which appears for the
first time at three loops. In addition we compare the behavior of the moments
for large n with the prediction from threshold calculations.
|
[
{
"created": "Fri, 16 Nov 2007 15:29:32 GMT",
"version": "v1"
}
] |
2008-11-26
|
[
[
"Maier",
"A.",
""
],
[
"Maierhoefer",
"P.",
""
],
[
"Marquard",
"P.",
""
]
] |
We present the first 30 moments of the low energy expansions of the vector, axial-vector, scalar and pseudo-scalar heavy quark correlation functions at three-loop order, including the singlet contribution which appears for the first time at three loops. In addition we compare the behavior of the moments for large n with the prediction from threshold calculations.
|
2004.12266
|
Ke-Sheng Sun
|
Ke-Sheng Sun, Sheng-Kai Cui, Wei Li, Hai-Bin Zhang
|
Muon conversion to electron in nuclei in Minimal R-symmetric
Supersymmetric Standard Model
|
16 pages, 5 figures
|
Phys. Rev. D 102, 035029 (2020)
|
10.1103/PhysRevD.102.035029
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We analyze the lepton flavor violating process $\mu-e$ conversion in the
framework of the minimal R-symmetric supersymmetric standard model. The
theoretical predictions are determined by considering the experimental
constraint on parameter $\delta^{12}$ from the lepton flavor violating decay
$\mu\rightarrow e \gamma$. The numerical results show that $\gamma$ penguins
and Z penguins dominate the predictions on CR($\mu-e$,Nucleus), and the
contributions from Higgs penguins and box diagrams are insignificant. The
theoretical predictions on conversion rate CR($\mu-e$,Nucleus) in a Al or Ti
target can be enhanced close to the future experimental sensitivities and are
very promising to be observed in near future experiment.
|
[
{
"created": "Sun, 26 Apr 2020 01:57:26 GMT",
"version": "v1"
},
{
"created": "Mon, 31 Aug 2020 02:02:58 GMT",
"version": "v2"
}
] |
2020-09-02
|
[
[
"Sun",
"Ke-Sheng",
""
],
[
"Cui",
"Sheng-Kai",
""
],
[
"Li",
"Wei",
""
],
[
"Zhang",
"Hai-Bin",
""
]
] |
We analyze the lepton flavor violating process $\mu-e$ conversion in the framework of the minimal R-symmetric supersymmetric standard model. The theoretical predictions are determined by considering the experimental constraint on parameter $\delta^{12}$ from the lepton flavor violating decay $\mu\rightarrow e \gamma$. The numerical results show that $\gamma$ penguins and Z penguins dominate the predictions on CR($\mu-e$,Nucleus), and the contributions from Higgs penguins and box diagrams are insignificant. The theoretical predictions on conversion rate CR($\mu-e$,Nucleus) in a Al or Ti target can be enhanced close to the future experimental sensitivities and are very promising to be observed in near future experiment.
|
hep-ph/9902350
| null |
Edmond L. Berger (Argonne), Michael Klasen (Argonne), Tim Tait
(Argonne & Michigan State University)
|
Associated Production of Gauginos and Gluinos at Hadron Colliders in
Next-to-Leading Order SUSY-QCD
|
11 pages, LaTeX, includes two figures, version to appear in Phys.
Lett. B
|
Phys.Lett.B459:165-170,1999
|
10.1016/S0370-2693(99)00617-6
|
ANL-HEP-PR-99-03; MSUHEP-90215
|
hep-ph
| null |
We report a next-to-leading order (NLO) calculation of the production of
gaugino-like charginos ($\chargino$) and neutralinos ($\neutralino$) in
association with gluinos ($\gluino$) at hadron colliders, including the strong
corrections from colored particles and sparticles. We predict inclusive cross
sections at the Fermilab Tevatron and CERN LHC. The NLO cross sections are more
stable against variations in the hard-scattering scale parameter and are
greater than the LO values.
|
[
{
"created": "Mon, 15 Feb 1999 21:56:09 GMT",
"version": "v1"
},
{
"created": "Thu, 24 Jun 1999 15:08:20 GMT",
"version": "v2"
}
] |
2008-11-26
|
[
[
"Berger",
"Edmond L.",
"",
"Argonne"
],
[
"Klasen",
"Michael",
"",
"Argonne"
],
[
"Tait",
"Tim",
"",
"Argonne & Michigan State University"
]
] |
We report a next-to-leading order (NLO) calculation of the production of gaugino-like charginos ($\chargino$) and neutralinos ($\neutralino$) in association with gluinos ($\gluino$) at hadron colliders, including the strong corrections from colored particles and sparticles. We predict inclusive cross sections at the Fermilab Tevatron and CERN LHC. The NLO cross sections are more stable against variations in the hard-scattering scale parameter and are greater than the LO values.
|
hep-ph/0212392
|
Nikita Agasian
|
Nikita O. Agasian (ITEP, Moscow)
|
Low temperature relations in QCD
|
10 pages, LaTeX2e. Talk given at 12th International Seminar on
High-Energy Physics (QUARKS 2002), Novgorod, Russia, 1-7 Jun 2002
|
Phys.Atom.Nucl.67:391-395,2004; Yad.Fiz.67:409-413,2004
|
10.1134/1.1648928
| null |
hep-ph
| null |
In this talk I discuss the low temperature relations for the trace of the
energy-momentum tensor in QCD with two and three quarks. It is shown that the
temperature derivatives of the anomalous and normal (quark massive term)
contributions to the trace of the energy-momentum tensor in QCD are equal to
each other in the low temperature region. Leading corrections connected with
$\pi\pi$-interactions and thermal excitations of $K$ and $\eta$ mesons are
calculated.
|
[
{
"created": "Mon, 30 Dec 2002 16:01:12 GMT",
"version": "v1"
}
] |
2011-03-22
|
[
[
"Agasian",
"Nikita O.",
"",
"ITEP, Moscow"
]
] |
In this talk I discuss the low temperature relations for the trace of the energy-momentum tensor in QCD with two and three quarks. It is shown that the temperature derivatives of the anomalous and normal (quark massive term) contributions to the trace of the energy-momentum tensor in QCD are equal to each other in the low temperature region. Leading corrections connected with $\pi\pi$-interactions and thermal excitations of $K$ and $\eta$ mesons are calculated.
|
1610.09677
|
Yakov Azimov
|
Ya.I. Azimov
|
Legendre Analysis of Hadronic Reactions
|
Talk at the Conference "Hadron Structure and Quantum Chromodynamics"
(HSQCD2016), Gatchina, 27 June - 1 July, 2016. To appear in the Proceedings
| null | null | null |
hep-ph hep-ex nucl-ex nucl-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Expansions over Legendre functions are suggested as a model-independent way
of compact presentation of modern precise and high-statistics data for
two-hadron reactions. Some properties of the expansions are described.
|
[
{
"created": "Sun, 30 Oct 2016 16:58:46 GMT",
"version": "v1"
}
] |
2016-11-01
|
[
[
"Azimov",
"Ya. I.",
""
]
] |
Expansions over Legendre functions are suggested as a model-independent way of compact presentation of modern precise and high-statistics data for two-hadron reactions. Some properties of the expansions are described.
|
hep-ph/0207135
|
Carl Shakin
|
Hu Li, C.M. Shakin
|
Description of Deconfinement at Finite Matter Density in a Generalized
Nambu--Jona-Lasinio Model
|
28 pages, 10 figures, revtex4
|
Phys.Rev.D66:074016,2002
|
10.1103/PhysRevD.66.074016
| null |
hep-ph
| null |
Recent years have seen extensive applications of the Nambu--Jona-Lasinio
(NJL) model in the study of matter at high density. There is a good deal of
interest in the predictions of diquark condensation and color
superconductivity, with suggested applications to the study the properties of
neutron stars. As the researchers in this field note, the NJL model does not
describe confinement, so that one is limited to the study of the deconfined
phase, which may set in at several times nuclear matter density. Recently, we
have extended the NJL model to include a covariant confinement model. In the
present work our goal is to include a phenomenological model of deconfinement
at finite matter density, using some analogy to what is known concerning
"string breaking" and deconfinement at finite temperature. Various models may
be used, but for this work we choose a specific model for the density
dependence of the parameters of our confining interaction. We perform
relativistic random-phase-approximation (RPA) calculations of the properties of
the $\pi(138), K(495), f_0(980), a_0(980)$ and $K_0^*(1430)$ mesons and their
radial excitations. In the model chosen for this work, there are no mesonic
states beyond about $2\rho_{NM}$, where $\rho_{NM}$ is the density of nuclear
matter. This inability of the model to support hadronic excitations at large
values of the density is taken as a signal of deconfinement. In addition to the
density dependence of the confining interaction, we use the density-dependent
quark mass values obtained in either the SU(2) or SU(3)-flavor versions of the
NJL model.
|
[
{
"created": "Wed, 10 Jul 2002 17:43:49 GMT",
"version": "v1"
}
] |
2010-11-15
|
[
[
"Li",
"Hu",
""
],
[
"Shakin",
"C. M.",
""
]
] |
Recent years have seen extensive applications of the Nambu--Jona-Lasinio (NJL) model in the study of matter at high density. There is a good deal of interest in the predictions of diquark condensation and color superconductivity, with suggested applications to the study the properties of neutron stars. As the researchers in this field note, the NJL model does not describe confinement, so that one is limited to the study of the deconfined phase, which may set in at several times nuclear matter density. Recently, we have extended the NJL model to include a covariant confinement model. In the present work our goal is to include a phenomenological model of deconfinement at finite matter density, using some analogy to what is known concerning "string breaking" and deconfinement at finite temperature. Various models may be used, but for this work we choose a specific model for the density dependence of the parameters of our confining interaction. We perform relativistic random-phase-approximation (RPA) calculations of the properties of the $\pi(138), K(495), f_0(980), a_0(980)$ and $K_0^*(1430)$ mesons and their radial excitations. In the model chosen for this work, there are no mesonic states beyond about $2\rho_{NM}$, where $\rho_{NM}$ is the density of nuclear matter. This inability of the model to support hadronic excitations at large values of the density is taken as a signal of deconfinement. In addition to the density dependence of the confining interaction, we use the density-dependent quark mass values obtained in either the SU(2) or SU(3)-flavor versions of the NJL model.
|
1812.10739
|
Wenchang Xiang
|
Wenchang Xiang, Yanbing Cai, Mengliang Wang, and Daicui Zhou
|
Rare fluctuations of the $S$-matrix at NLO in QCD
|
15 pages, 4 figures
|
Phys. Rev. D 99, 096026 (2019)
|
10.1103/PhysRevD.99.096026
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We calculate the rare fluctuations of the $S$-matrix on top of the full
next-to-leading order corrections in the center of mass frame. The relevant
result in the saturation regime shows that the exponential factor of the
$S$-matrix is $\sqrt{2}$ as large as the result which emerges when the rare
fluctuation effects are taken into account. We find that the factor of
$\sqrt{2}$ change of the exponential factor is induced by the gluon loop
corrections which compensate part of rapidity decrease of the $S$-matrix made
by quark loops and lead to the rare fluctuations becoming important again. To
ensure the relevant results of the $S$-matrix are independent of the frame
choice, the rare fluctuations of the $S$-matrix are also derived in a general
frame. It is found that all the results are consistent with each other in both
frames.
|
[
{
"created": "Thu, 27 Dec 2018 15:07:59 GMT",
"version": "v1"
}
] |
2019-06-05
|
[
[
"Xiang",
"Wenchang",
""
],
[
"Cai",
"Yanbing",
""
],
[
"Wang",
"Mengliang",
""
],
[
"Zhou",
"Daicui",
""
]
] |
We calculate the rare fluctuations of the $S$-matrix on top of the full next-to-leading order corrections in the center of mass frame. The relevant result in the saturation regime shows that the exponential factor of the $S$-matrix is $\sqrt{2}$ as large as the result which emerges when the rare fluctuation effects are taken into account. We find that the factor of $\sqrt{2}$ change of the exponential factor is induced by the gluon loop corrections which compensate part of rapidity decrease of the $S$-matrix made by quark loops and lead to the rare fluctuations becoming important again. To ensure the relevant results of the $S$-matrix are independent of the frame choice, the rare fluctuations of the $S$-matrix are also derived in a general frame. It is found that all the results are consistent with each other in both frames.
|
hep-ph/0304237
|
Bourge
|
A. Stocchi (LAL, Orsay)
|
Final Results on Heavy Quarks at LEP and SLD
|
Talk given at the XXX SLAC Summer Institute, ssi2002, August
5-16,2002
|
ECONF C020805:TTH04,2002
| null |
LAL03-22
|
hep-ph
| null |
In the last decade, the LEP and SLD experiments played a central role in the
study of B hadrons (hadrons containing a b quark).
New B hadrons have been observed ($B^0_s$, \Lambda_b$, $\Xi_b$ and $B^{**}$)
and their production and decay properties have been measured. In this paper we
will focus on measurements of the CKM matrix elements: $|V_{cb}|$, $|V_{ub}|$,
$|V_{td}|$ and $|V_{ts}|$. We will show how all these measurements, together
with theoretical developments, have significantly improved our knowledge on the
flavour sector of the Standard Model.
|
[
{
"created": "Thu, 24 Apr 2003 13:45:55 GMT",
"version": "v1"
},
{
"created": "Tue, 6 May 2003 19:09:15 GMT",
"version": "v2"
}
] |
2010-11-23
|
[
[
"Stocchi",
"A.",
"",
"LAL, Orsay"
]
] |
In the last decade, the LEP and SLD experiments played a central role in the study of B hadrons (hadrons containing a b quark). New B hadrons have been observed ($B^0_s$, \Lambda_b$, $\Xi_b$ and $B^{**}$) and their production and decay properties have been measured. In this paper we will focus on measurements of the CKM matrix elements: $|V_{cb}|$, $|V_{ub}|$, $|V_{td}|$ and $|V_{ts}|$. We will show how all these measurements, together with theoretical developments, have significantly improved our knowledge on the flavour sector of the Standard Model.
|
hep-ph/9411439
| null |
G. D'Ambrosio, G. Ecker, G. Isidori and H. Neufeld
|
Radiative Non-Leptonic Kaon Decays
|
41 pages, latex file, 10 figures added in a separate uufile
| null | null |
INFNFA-IV-94/24, DSF-94/24, UWThPh-1994-20, CERN-TH-7503/94.
Contribution to the 2nd. edition of the DAFNE Physics Handbook, eds. L.
Maiani, G. Pancheri and N. Paver
|
hep-ph
| null |
We investigate to what extent DA$\Phi$NE will be able to test the Standard
Model in the confinement regime with radiative kaon decays. We concentrate on
processes which can be detected at DA$\Phi$NE and we review briefly those
decays where only upper limits can be expected. The Standard Model predictions
for these decays are analyzed in the framework of chiral perturbation theory.
|
[
{
"created": "Wed, 30 Nov 1994 14:55:21 GMT",
"version": "v1"
}
] |
2007-05-23
|
[
[
"D'Ambrosio",
"G.",
""
],
[
"Ecker",
"G.",
""
],
[
"Isidori",
"G.",
""
],
[
"Neufeld",
"H.",
""
]
] |
We investigate to what extent DA$\Phi$NE will be able to test the Standard Model in the confinement regime with radiative kaon decays. We concentrate on processes which can be detected at DA$\Phi$NE and we review briefly those decays where only upper limits can be expected. The Standard Model predictions for these decays are analyzed in the framework of chiral perturbation theory.
|
2405.00777
|
Gustavo Alves
|
Gustavo F. S. Alves, Pedro A. N. Machado and Renata Zukanovich Funchal
|
Could SBND-PRISM probe Lepton Flavor Violation?
|
7 pages, 3 figures
| null | null | null |
hep-ph
|
http://creativecommons.org/licenses/by/4.0/
|
We investigate the possibility of using the Short-Baseline Near Detector
(SBND) at Fermilab to constrain lepton flavor violating decays of pions and
kaons. We study how to leverage SBND-PRISM, the use of the neutrino beam
angular spread to mitigate systematic uncertainties, to enhance this analysis.
We show that SBND-PRISM can put stringent limits on the flavor violating
branching ratios $\rm{BR}(\pi^+ \to \mu^+ \nu_e) = 8.9 \times 10^{-4}$,
$\rm{BR}(K^+ \to \mu^+ \nu_e) = 3.2 \times 10^{-3}$, improving previous
constraints by factors 9 and 1.25, respectively. We also estimate the
SBND-PRISM sensitivity to lepton number violating decays, $\rm{BR}(\pi^+ \to
\mu^+ \overline{\nu}_e)= 2.1 \times 10^{-3}$ and $\rm{BR}(K^+ \to \mu^+
\overline{\nu}_e) = 7.4 \times 10^{-3}$, though not reaching previous BEBC
limits. Last, we identify several ways how the SBND collaboration could improve
this analysis.
|
[
{
"created": "Wed, 1 May 2024 18:00:05 GMT",
"version": "v1"
}
] |
2024-05-03
|
[
[
"Alves",
"Gustavo F. S.",
""
],
[
"Machado",
"Pedro A. N.",
""
],
[
"Funchal",
"Renata Zukanovich",
""
]
] |
We investigate the possibility of using the Short-Baseline Near Detector (SBND) at Fermilab to constrain lepton flavor violating decays of pions and kaons. We study how to leverage SBND-PRISM, the use of the neutrino beam angular spread to mitigate systematic uncertainties, to enhance this analysis. We show that SBND-PRISM can put stringent limits on the flavor violating branching ratios $\rm{BR}(\pi^+ \to \mu^+ \nu_e) = 8.9 \times 10^{-4}$, $\rm{BR}(K^+ \to \mu^+ \nu_e) = 3.2 \times 10^{-3}$, improving previous constraints by factors 9 and 1.25, respectively. We also estimate the SBND-PRISM sensitivity to lepton number violating decays, $\rm{BR}(\pi^+ \to \mu^+ \overline{\nu}_e)= 2.1 \times 10^{-3}$ and $\rm{BR}(K^+ \to \mu^+ \overline{\nu}_e) = 7.4 \times 10^{-3}$, though not reaching previous BEBC limits. Last, we identify several ways how the SBND collaboration could improve this analysis.
|
hep-ph/0303109
|
Michael Buballa
|
M. Frank, M. Buballa, and M. Oertel
|
Flavor-Mixing Effects on the QCD Phase Diagram at non-vanishing Isospin
Chemical Potential: One or Two Phase Transitions?
|
7 pages, 2 ps figures
|
Phys.Lett. B562 (2003) 221-226
|
10.1016/S0370-2693(03)00607-5
| null |
hep-ph nucl-th
| null |
We investigate effects of a fixed nonzero isospin chemical potential on the
mu_B-T phase diagram of strongly interacting matter using a
Nambu--Jona-Lasinio-type four fermion interaction. We focus on the influence of
a flavor-mixing interaction induced by instantons. We find that already for
rather moderate values of the coupling strength in the flavor-mixing channel
the recent findings of two seperate phase transitions do not persist.
|
[
{
"created": "Thu, 13 Mar 2003 15:31:47 GMT",
"version": "v1"
}
] |
2009-11-10
|
[
[
"Frank",
"M.",
""
],
[
"Buballa",
"M.",
""
],
[
"Oertel",
"M.",
""
]
] |
We investigate effects of a fixed nonzero isospin chemical potential on the mu_B-T phase diagram of strongly interacting matter using a Nambu--Jona-Lasinio-type four fermion interaction. We focus on the influence of a flavor-mixing interaction induced by instantons. We find that already for rather moderate values of the coupling strength in the flavor-mixing channel the recent findings of two seperate phase transitions do not persist.
|
0805.2703
|
Frieder Kleefeld
|
F. Kleefeld (CFIF, Ist, Lisbon)
|
On the Dynamical Generation of Quark-Level-Linear-Sigma-Model-like
Theories beyond one Loop
|
4 pages, 4 figures; manuscript to be published in the proceedings of
the workshop "Scalar Mesons and Related Topics" (Scadron70), February
11-16,2008, at the IST, Lisbon, Portugal, honoring M.D. Scadron's 70th
birthday on February 12, 2008
| null |
10.1063/1.2973543
|
FK-2008-2
|
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
A self-consistent strategy to complete the dynamical generation of
Quark-Level-Linear-Sigma-Model-like Lagrangean theories beyond one loop as
proposed in more detail in our manuscript arXiv:0802.1540 [hep-ph] is shortly
outlined.
|
[
{
"created": "Sat, 17 May 2008 21:15:55 GMT",
"version": "v1"
}
] |
2009-11-13
|
[
[
"Kleefeld",
"F.",
"",
"CFIF, Ist, Lisbon"
]
] |
A self-consistent strategy to complete the dynamical generation of Quark-Level-Linear-Sigma-Model-like Lagrangean theories beyond one loop as proposed in more detail in our manuscript arXiv:0802.1540 [hep-ph] is shortly outlined.
|
0705.2025
|
Christopher Smith
|
Federico Mescia, Christopher Smith
|
Improved estimates of rare K decay matrix-elements from Kl3 decays
|
16 pages, 1 figure. Numerical analysis updated to include the recent
Kl3 data. To appear in Phys. Rev. D
|
Phys.Rev.D76:034017,2007
|
10.1103/PhysRevD.76.034017
| null |
hep-ph
| null |
The estimation of rare K decay matrix-elements from Kl3 experimental data is
extended beyond LO in Chiral Perturbation Theory. Isospin-breaking effects at
NLO (and partially NNLO) in the ChPT expansion, as well as QED radiative
corrections are now accounted for. The analysis relies mainly on the cleanness
of two specific ratios of form-factors, for which the theoretical control is
excellent. As a result, the uncertainties on the K+ --> pi+ nu nubar and KL -->
pi0 nu nubar matrix-elements are reduced by a factor of about 7 and 4,
respectively, and similarly for the direct CP-violating contribution to KL -->
pi0 l+ l-. They could be reduced even further with better experimental data for
the Kl3 slopes and the K+l3 branching ratios. As a result, the non-parametric
errors for B(K --> pi nu nubar) and for the direct CP-violating contributions
to B(KL --> pi0 l+ l-) are now completely dominated by those on the
short-distance physics.
|
[
{
"created": "Tue, 15 May 2007 18:11:30 GMT",
"version": "v1"
},
{
"created": "Tue, 28 Aug 2007 16:28:53 GMT",
"version": "v2"
}
] |
2008-11-26
|
[
[
"Mescia",
"Federico",
""
],
[
"Smith",
"Christopher",
""
]
] |
The estimation of rare K decay matrix-elements from Kl3 experimental data is extended beyond LO in Chiral Perturbation Theory. Isospin-breaking effects at NLO (and partially NNLO) in the ChPT expansion, as well as QED radiative corrections are now accounted for. The analysis relies mainly on the cleanness of two specific ratios of form-factors, for which the theoretical control is excellent. As a result, the uncertainties on the K+ --> pi+ nu nubar and KL --> pi0 nu nubar matrix-elements are reduced by a factor of about 7 and 4, respectively, and similarly for the direct CP-violating contribution to KL --> pi0 l+ l-. They could be reduced even further with better experimental data for the Kl3 slopes and the K+l3 branching ratios. As a result, the non-parametric errors for B(K --> pi nu nubar) and for the direct CP-violating contributions to B(KL --> pi0 l+ l-) are now completely dominated by those on the short-distance physics.
|
1904.02676
|
Michal Praszalowicz
|
Michal Praszalowicz
|
Doubly heavy $QQ$ tetraquarks
|
6 pages, 2 figures, talk at the conference Excited QCD, Schladming,
Austria, January 30 - February 3, 2019. In v2 minor typos corrected,
references added
|
Acta Phys.Polon.Supp. 13 (2020) 103-108
|
10.5506/APhysPolBSupp.13.103
| null |
hep-ph
|
http://creativecommons.org/licenses/by/4.0/
|
With the discovery of a doubly charmed $\Xi_{cc}$ baryon a somewhat forgotten
issue of tetraquarks containing two heavy and two light (anti) quarks, ${\cal
T}_{QQ}$, triggered theorist's interest. We discuss quark model estimates of
${\cal T}_{QQ}$ masses and such objects including a model where the light
sector is treated as a soliton. We show that this model has different large
$N_c$ limit than other approaches.
|
[
{
"created": "Thu, 4 Apr 2019 17:25:40 GMT",
"version": "v1"
},
{
"created": "Tue, 9 Apr 2019 16:33:34 GMT",
"version": "v2"
}
] |
2022-05-09
|
[
[
"Praszalowicz",
"Michal",
""
]
] |
With the discovery of a doubly charmed $\Xi_{cc}$ baryon a somewhat forgotten issue of tetraquarks containing two heavy and two light (anti) quarks, ${\cal T}_{QQ}$, triggered theorist's interest. We discuss quark model estimates of ${\cal T}_{QQ}$ masses and such objects including a model where the light sector is treated as a soliton. We show that this model has different large $N_c$ limit than other approaches.
|
0710.0548
|
Bachir Moussallam
|
B. Moussallam
|
Analyticity constraints on the strangeness changing vector current and
applications to $\tau\to K\pi \nu_\tau$, $\tau\to K\pi\pi \nu_\tau$
|
24 pages, 11 figures. v2: minor corrections and clarifications
|
Eur.Phys.J.C53:401-412,2008
|
10.1140/epjc/s10052-007-0464-7
| null |
hep-ph
| null |
We discuss matrix elements of the strangeness changing vector current using
their relation, due to analyticity, with $\pi K$ scattering in the $P$-wave. We
take into account experimental phase-shift measurements in the elastic channel
as well as results, obtained by the LASS collaboration, on the details of
inelastic scattering, which show the dominance of two quasi two-body channels
at medium energies.The associated form factors are shown to be completely
determined, up to one flavour symmetry breaking parameter, imposing boundary
conditions at $t=0$ from chiral and flavour symmetries and at $t\to\infty$ from
QCD. We apply the results to the $\tau\to K\pi \nu_\tau$ and $\tau\to K\pi\pi
\nu_\tau$ amplitudes and compare the former to recent high statistics results
from B factories.
|
[
{
"created": "Tue, 2 Oct 2007 14:49:57 GMT",
"version": "v1"
},
{
"created": "Fri, 2 Nov 2007 10:01:54 GMT",
"version": "v2"
}
] |
2008-11-26
|
[
[
"Moussallam",
"B.",
""
]
] |
We discuss matrix elements of the strangeness changing vector current using their relation, due to analyticity, with $\pi K$ scattering in the $P$-wave. We take into account experimental phase-shift measurements in the elastic channel as well as results, obtained by the LASS collaboration, on the details of inelastic scattering, which show the dominance of two quasi two-body channels at medium energies.The associated form factors are shown to be completely determined, up to one flavour symmetry breaking parameter, imposing boundary conditions at $t=0$ from chiral and flavour symmetries and at $t\to\infty$ from QCD. We apply the results to the $\tau\to K\pi \nu_\tau$ and $\tau\to K\pi\pi \nu_\tau$ amplitudes and compare the former to recent high statistics results from B factories.
|
1703.00448
|
Kevin Kelly
|
Kevin J. Kelly
|
Searches for new physics at the Hyper-Kamiokande experiment
|
14 pages, 8 figures. Minor changes to results; matches published
version
|
Phys. Rev. D 95, 115009 (2017)
|
10.1103/PhysRevD.95.115009
|
NUHEP-TH/17-01
|
hep-ph hep-ex
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We investigate the ability of the upcoming Hyper-Kamiokande (Hyper-K)
neutrino experiment to detect new physics phenomena beyond the standard,
three-massive-neutrinos paradigm; namely the existence of a fourth, sterile
neutrino or weaker-than-weak, non-standard neutrino interactions. With both
beam-based neutrinos from the Japan Proton Accelerator Research Complex
(J-PARC) and atmospheric neutrinos, Hyper-K is capable of exploring new ranges
of parameter space in these new-physics scenarios. We find that Hyper-K has
comparable capability to the upcoming Deep Underground Neutrino Experiment
(DUNE), and that combining both beam- and atmospheric-based data can clear up
degeneracies in the parameter spaces of interest. We also comment on the
potential improvement in searches for new physics if a combined analysis were
performed using Hyper-K and DUNE data.
|
[
{
"created": "Wed, 1 Mar 2017 19:00:00 GMT",
"version": "v1"
},
{
"created": "Thu, 15 Jun 2017 21:53:59 GMT",
"version": "v2"
}
] |
2017-06-19
|
[
[
"Kelly",
"Kevin J.",
""
]
] |
We investigate the ability of the upcoming Hyper-Kamiokande (Hyper-K) neutrino experiment to detect new physics phenomena beyond the standard, three-massive-neutrinos paradigm; namely the existence of a fourth, sterile neutrino or weaker-than-weak, non-standard neutrino interactions. With both beam-based neutrinos from the Japan Proton Accelerator Research Complex (J-PARC) and atmospheric neutrinos, Hyper-K is capable of exploring new ranges of parameter space in these new-physics scenarios. We find that Hyper-K has comparable capability to the upcoming Deep Underground Neutrino Experiment (DUNE), and that combining both beam- and atmospheric-based data can clear up degeneracies in the parameter spaces of interest. We also comment on the potential improvement in searches for new physics if a combined analysis were performed using Hyper-K and DUNE data.
|
0705.2759
|
Vasile Topor Pop N
|
V. Topor Pop, J. Barrette, C. Gale, S. Jeon (McGill Univ., Canada), M.
Gyulassy (Columbia Univ.NY, USA and FIAS, Frankfurt am Main, Germany)
|
Stopping Power from SPS to LHC energies
|
3 pages, 2 figures, submitted to the CERN Theory Institute Workshop,
Heavy Ion Collisions at the LHC. Last Call Predictions, May 14 - June 8, 2007
| null | null | null |
hep-ph
| null |
We investigate the energy dependence of hadron production and of stopping
power based on HIJING/BBbar v2.0 model calculations. Pseudorapidity spectra and
transverse momentum distributions for produced charged particles as well as net
baryons (per pair of partcipants) and their rapidity loss are compared to data
at RHIC and predictions for LHC energies are discussed.
|
[
{
"created": "Fri, 18 May 2007 19:16:04 GMT",
"version": "v1"
}
] |
2007-05-23
|
[
[
"Pop",
"V. Topor",
"",
"McGill Univ., Canada"
],
[
"Barrette",
"J.",
"",
"McGill Univ., Canada"
],
[
"Gale",
"C.",
"",
"McGill Univ., Canada"
],
[
"Jeon",
"S.",
"",
"McGill Univ., Canada"
],
[
"Gyulassy",
"M.",
"",
"Columbia Univ.NY, USA and FIAS, Frankfurt am Main, Germany"
]
] |
We investigate the energy dependence of hadron production and of stopping power based on HIJING/BBbar v2.0 model calculations. Pseudorapidity spectra and transverse momentum distributions for produced charged particles as well as net baryons (per pair of partcipants) and their rapidity loss are compared to data at RHIC and predictions for LHC energies are discussed.
|
2106.03549
|
Roman Pasechnik
|
Andrea Addazi, Antonino Marciano, Roman Pasechnik and Kaiqiang Alan
Zeng
|
QCD surprises: strong CP problem, neutrino mass, Dark Matter and Dark
Energy
|
6 pages, 2 figures; a typo fixed; acknowledgments added; conclusions
unchanged
| null | null | null |
hep-ph gr-qc hep-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
An unexpected explanation for neutrino mass, Dark Matter (DM) and Dark Energy
(DE) from genuine Quantum Chromodynamics (QCD) of the Standard Model (SM) is
proposed here, while the strong CP problem is resolved without any need to
account for fundamental axions. We suggest that the neutrino sector can be in a
double phase in the Universe: i) relativistic neutrinos, belonging to the SM;
ii) non-relativistic condensate of Majorana neutrinos. The condensate of
neutrinos can provide an attractive alternative candidate for the DM, being in
a cold coherent state. We will explain how neutrinos, combining into Cooper
pairs, can form collective low-energy degrees of freedom, hence providing a
strongly motivated candidate for the QCD (composite) axion.
|
[
{
"created": "Fri, 4 Jun 2021 09:37:31 GMT",
"version": "v1"
},
{
"created": "Sun, 13 Jun 2021 10:50:03 GMT",
"version": "v2"
},
{
"created": "Sat, 9 Oct 2021 10:02:55 GMT",
"version": "v3"
}
] |
2021-10-12
|
[
[
"Addazi",
"Andrea",
""
],
[
"Marciano",
"Antonino",
""
],
[
"Pasechnik",
"Roman",
""
],
[
"Zeng",
"Kaiqiang Alan",
""
]
] |
An unexpected explanation for neutrino mass, Dark Matter (DM) and Dark Energy (DE) from genuine Quantum Chromodynamics (QCD) of the Standard Model (SM) is proposed here, while the strong CP problem is resolved without any need to account for fundamental axions. We suggest that the neutrino sector can be in a double phase in the Universe: i) relativistic neutrinos, belonging to the SM; ii) non-relativistic condensate of Majorana neutrinos. The condensate of neutrinos can provide an attractive alternative candidate for the DM, being in a cold coherent state. We will explain how neutrinos, combining into Cooper pairs, can form collective low-energy degrees of freedom, hence providing a strongly motivated candidate for the QCD (composite) axion.
|
hep-ph/0209034
|
Ismail Zahed
|
I. Zahed
|
Scattering Through QCD Sphalerons
|
Contribution to quark matter 2002
|
Nucl.Phys. A715 (2003) 887-890
|
10.1016/S0375-9474(02)01534-8
| null |
hep-ph
| null |
Diffractive parton-parton scattering in the soft pomeron regime can be
explained by the production of a QCD sphaleron. Sphaleron production results
into the emission of $3+2N_F$ gluons and quarks. At RHIC we expect many
sphalerons to be released thereby affecting most prompt processes.
|
[
{
"created": "Tue, 3 Sep 2002 22:36:53 GMT",
"version": "v1"
}
] |
2009-11-07
|
[
[
"Zahed",
"I.",
""
]
] |
Diffractive parton-parton scattering in the soft pomeron regime can be explained by the production of a QCD sphaleron. Sphaleron production results into the emission of $3+2N_F$ gluons and quarks. At RHIC we expect many sphalerons to be released thereby affecting most prompt processes.
|
1203.4185
|
Y.H Ahn
|
Y. H. Ahn and Sin Kyu Kang
|
Non-zero $\theta_{13}$ and CP violation in a model with $A_4$ flavor
symmetry
|
Two figures are added more (24 pages, 13 figures). Version to appear
in Physical Review D
| null |
10.1103/PhysRevD.86.093003
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Motivated by recent observations of non-zero $\theta_{13}$ from the Daya Bay
and RENO experiments, we propose a renormalizable neutrino model with $A_4$
discrete symmetry accounting for deviations from the tri-bimaximal mixing
pattern of neutrino mixing matrix indicated by neutrino oscillation data. In
the model, the light neutrino masses can be generated by radiative corrections,
and we show how the light neutrino mass matrix can be diagonalized by the
Pontecorvo-Maki-Nakagawa-Sakata mixing matrix whose entries are determined by
the current neutrino data including the Daya Bay result. We show that the
origin of the deviations from the TBM mixing is non-degeneracy of the neutrino
Yukawa coupling constants, and unremovable CP phases in the neutrino Yukawa
matrix give rise to both low energy CP violation measurable from neutrino
oscillation and high energy CP violation.
|
[
{
"created": "Mon, 19 Mar 2012 17:54:39 GMT",
"version": "v1"
},
{
"created": "Tue, 24 Apr 2012 08:05:14 GMT",
"version": "v2"
},
{
"created": "Tue, 23 Oct 2012 20:24:58 GMT",
"version": "v3"
}
] |
2015-06-04
|
[
[
"Ahn",
"Y. H.",
""
],
[
"Kang",
"Sin Kyu",
""
]
] |
Motivated by recent observations of non-zero $\theta_{13}$ from the Daya Bay and RENO experiments, we propose a renormalizable neutrino model with $A_4$ discrete symmetry accounting for deviations from the tri-bimaximal mixing pattern of neutrino mixing matrix indicated by neutrino oscillation data. In the model, the light neutrino masses can be generated by radiative corrections, and we show how the light neutrino mass matrix can be diagonalized by the Pontecorvo-Maki-Nakagawa-Sakata mixing matrix whose entries are determined by the current neutrino data including the Daya Bay result. We show that the origin of the deviations from the TBM mixing is non-degeneracy of the neutrino Yukawa coupling constants, and unremovable CP phases in the neutrino Yukawa matrix give rise to both low energy CP violation measurable from neutrino oscillation and high energy CP violation.
|
1611.03502
|
Bastian Kubis
|
M. Albaladejo, J. T. Daub, C. Hanhart, B. Kubis, B. Moussallam
|
How to employ $\bar{B}^0_d \to J/\psi(\pi\eta,\bar{K}K)$ decays to
extract information on $\pi\eta$ scattering
|
26 pages, 4 figures; v2: discussion extended, new sec. 3 and app. B,
as published in JHEP
|
JHEP 1704 (2017) 010
|
10.1007/JHEP04(2017)010
| null |
hep-ph hep-ex
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We demonstrate that dispersion theory allows one to deduce crucial
information on $\pi\eta$ scattering from the final-state interactions of the
light mesons visible in the spectral distributions of the decays $\bar{B}^0_d
\to J/\psi(\pi^0\eta,K^+K^-,K^0\bar{K}^0)$. Thus high-quality measurements of
these differential observables are highly desired. The corresponding rates are
predicted to be of the same order of magnitude as those for $\bar{B}^0_d \to
J/\psi\pi^+\pi^-$ measured recently at LHCb, letting the corresponding
measurement appear feasible.
|
[
{
"created": "Thu, 10 Nov 2016 21:00:04 GMT",
"version": "v1"
},
{
"created": "Thu, 6 Apr 2017 13:47:18 GMT",
"version": "v2"
}
] |
2017-04-07
|
[
[
"Albaladejo",
"M.",
""
],
[
"Daub",
"J. T.",
""
],
[
"Hanhart",
"C.",
""
],
[
"Kubis",
"B.",
""
],
[
"Moussallam",
"B.",
""
]
] |
We demonstrate that dispersion theory allows one to deduce crucial information on $\pi\eta$ scattering from the final-state interactions of the light mesons visible in the spectral distributions of the decays $\bar{B}^0_d \to J/\psi(\pi^0\eta,K^+K^-,K^0\bar{K}^0)$. Thus high-quality measurements of these differential observables are highly desired. The corresponding rates are predicted to be of the same order of magnitude as those for $\bar{B}^0_d \to J/\psi\pi^+\pi^-$ measured recently at LHCb, letting the corresponding measurement appear feasible.
|
hep-ph/0311163
|
Calderon German
|
G. Calderon (CINVESTAV, IPN), J.-M. Gerard, J. Pestieau, J. Weyers
(Louvain U.)
|
Relating Final State Interactions in $B\to D\pi$ and $B\to DK$
|
8 pages and 1 eps figure
|
Phys.Lett. B588 (2004) 81-84
|
10.1016/j.physletb.2003.12.080
|
UCL-IPT-03-17
|
hep-ph
| null |
A Regge model calculation relates the strong phase in $B \to DK$ to that in
$B\to D\pi$. This provides a significant test of a hadronic picture of final
state interactions in B decays.
|
[
{
"created": "Wed, 12 Nov 2003 23:28:26 GMT",
"version": "v1"
}
] |
2009-11-10
|
[
[
"Calderon",
"G.",
"",
"CINVESTAV, IPN"
],
[
"Gerard",
"J. -M.",
"",
"Louvain U."
],
[
"Pestieau",
"J.",
"",
"Louvain U."
],
[
"Weyers",
"J.",
"",
"Louvain U."
]
] |
A Regge model calculation relates the strong phase in $B \to DK$ to that in $B\to D\pi$. This provides a significant test of a hadronic picture of final state interactions in B decays.
|
1304.0077
|
Elke-Caroline Aschenauer
|
Elke-Caroline Aschenauer (BNL), Salvatore Fazio (BNL), Kresimir
Kumericki (University of Zagreb) and Dieter Mueller (Ruhr-University Bochum)
|
Deeply Virtual Compton Scattering at a Proposed High-Luminosity
Electron-Ion Collider
| null | null |
10.1007/JHEP09(2013)093
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Several observables for the deeply virtual Compton scattering process have
been simulated in the kinematic regime of a proposed Electron-Ion Collider to
explore the possible impact of such measurements for the phenomenological
access of generalized parton distributions. In particular, emphasis is given to
the transverse distribution of sea quarks and gluons and how such measurements
can provide information on the angular momentum sum rule. The exact lepton
energy loss dependence for the unpolarized $t$-differential electroproduction
cross section, needed for a Rosenbluth separation, is also reported.
|
[
{
"created": "Sat, 30 Mar 2013 08:57:04 GMT",
"version": "v1"
},
{
"created": "Tue, 13 Aug 2013 03:47:00 GMT",
"version": "v2"
}
] |
2015-06-15
|
[
[
"Aschenauer",
"Elke-Caroline",
"",
"BNL"
],
[
"Fazio",
"Salvatore",
"",
"BNL"
],
[
"Kumericki",
"Kresimir",
"",
"University of Zagreb"
],
[
"Mueller",
"Dieter",
"",
"Ruhr-University Bochum"
]
] |
Several observables for the deeply virtual Compton scattering process have been simulated in the kinematic regime of a proposed Electron-Ion Collider to explore the possible impact of such measurements for the phenomenological access of generalized parton distributions. In particular, emphasis is given to the transverse distribution of sea quarks and gluons and how such measurements can provide information on the angular momentum sum rule. The exact lepton energy loss dependence for the unpolarized $t$-differential electroproduction cross section, needed for a Rosenbluth separation, is also reported.
|
hep-ph/0003273
|
Rafel Escribano
|
A. Bramon, R. Escribano, J. L. Lucio M., G. Pancheri
|
The ratio Phi->K+K-/K0K0bar
|
16 pages
|
Phys.Lett.B486:406-413,2000
|
10.1016/S0370-2693(00)00770-X
|
LNF-00/013(P), UAB-FT/485
|
hep-ph hep-ex
| null |
The ratio Phi->K+K-/K0K0bar is discussed and its present experimental value
is compared with theoretical expectations. A difference larger than two
standard deviations is observed. We critically examine a number of mechanisms
that could account for this discrepancy, which remains unexplained.
Measurements at DAPHNE at the level of the per mille accuracy can clarify
whether there exist any anomaly.
|
[
{
"created": "Tue, 28 Mar 2000 13:19:33 GMT",
"version": "v1"
},
{
"created": "Fri, 7 Jul 2000 11:15:56 GMT",
"version": "v2"
}
] |
2008-11-26
|
[
[
"Bramon",
"A.",
""
],
[
"Escribano",
"R.",
""
],
[
"M.",
"J. L. Lucio",
""
],
[
"Pancheri",
"G.",
""
]
] |
The ratio Phi->K+K-/K0K0bar is discussed and its present experimental value is compared with theoretical expectations. A difference larger than two standard deviations is observed. We critically examine a number of mechanisms that could account for this discrepancy, which remains unexplained. Measurements at DAPHNE at the level of the per mille accuracy can clarify whether there exist any anomaly.
|
1307.0025
|
Matthias Neubert
|
Thomas Becher, Matthias Neubert and Lorena Rothen
|
Factorization and N^3LL_p+NNLO Predictions for the Higgs Cross Section
with a Jet Veto
|
43 pages, 12 figures; minor changes, references updated; version
published in JHEP
| null |
10.1007/JHEP10(2013)125
|
MITP/13-37
|
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We have recently derived a factorization formula for the Higgs-boson
production cross section in the presence of a jet veto, which allows for a
systematic resummation of large Sudakov logarithms of the form alpha_s^n
ln^m(p_T^veto/m_H), along with the large virtual corrections known to affect
also the total cross section. Here we determine the ingredients entering this
formula at two-loop accuracy. Specifically, we compute the dependence on the
jet-radius parameter R, which is encoded in the two-loop coefficient of the
collinear anomaly, by means of a direct, fully analytic calculation in the
framework of soft-collinear effective theory. We confirm the result obtained by
Banfi et al. from a related calculation in QCD, and demonstrate that
factorization-breaking, soft-collinear mixing effects do not arise at leading
power in p_T^veto/m_H, even for R=O(1). In addition, we extract the two-loop
collinear beam functions numerically. We present detailed numerical predictions
for the jet-veto cross section with partial next-to-next-to-next-to-leading
logarithmic accuracy, matched to the next-to-next-to-leading order cross
section in fixed-order perturbation theory. The only missing ingredients at
this level of accuracy are the three-loop anomaly coefficient and the four-loop
cusp anomalous dimension, whose numerical effects we estimate to be small.
|
[
{
"created": "Fri, 28 Jun 2013 20:23:24 GMT",
"version": "v1"
},
{
"created": "Tue, 17 Sep 2013 09:42:13 GMT",
"version": "v2"
}
] |
2015-06-16
|
[
[
"Becher",
"Thomas",
""
],
[
"Neubert",
"Matthias",
""
],
[
"Rothen",
"Lorena",
""
]
] |
We have recently derived a factorization formula for the Higgs-boson production cross section in the presence of a jet veto, which allows for a systematic resummation of large Sudakov logarithms of the form alpha_s^n ln^m(p_T^veto/m_H), along with the large virtual corrections known to affect also the total cross section. Here we determine the ingredients entering this formula at two-loop accuracy. Specifically, we compute the dependence on the jet-radius parameter R, which is encoded in the two-loop coefficient of the collinear anomaly, by means of a direct, fully analytic calculation in the framework of soft-collinear effective theory. We confirm the result obtained by Banfi et al. from a related calculation in QCD, and demonstrate that factorization-breaking, soft-collinear mixing effects do not arise at leading power in p_T^veto/m_H, even for R=O(1). In addition, we extract the two-loop collinear beam functions numerically. We present detailed numerical predictions for the jet-veto cross section with partial next-to-next-to-next-to-leading logarithmic accuracy, matched to the next-to-next-to-leading order cross section in fixed-order perturbation theory. The only missing ingredients at this level of accuracy are the three-loop anomaly coefficient and the four-loop cusp anomalous dimension, whose numerical effects we estimate to be small.
|
2402.12600
|
C\'esar Lenzi C H L
|
C. V. Flores, C. H. Lenzi, M. Dutra, O. Louren\c{c}o, J. D. V.
Arba\~nil
|
Gravitational wave asteroseismology of dark matter hadronic stars
| null | null | null | null |
hep-ph astro-ph.HE gr-qc
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
The influence of the dark matter mass~($M_{\chi}$) and the Fermi
momentum~($k_{F}^{\dm}$) on the $f_0$-mode oscillation frequency, damping time
parameter, and tidal deformability of hadronic stars are studied by employing a
numerical integration of hydrostatic equilibrium, nonradial oscillation, and
tidal deformability equations. The matter inside the hadronic stars follows the
NL3* equation of state. We obtain that the influence of $M_{\chi}$ and
$k_F^{\dm}$ is observed in the $f_0$-mode, damping tome parameter, and tidal
deformability. Finally, the correlation between the tidal deformability of the
GW$170817$ event with $M_{\chi}$ and $k_F^{\dm}$ are also investigated.
|
[
{
"created": "Mon, 19 Feb 2024 23:50:32 GMT",
"version": "v1"
}
] |
2024-02-22
|
[
[
"Flores",
"C. V.",
""
],
[
"Lenzi",
"C. H.",
""
],
[
"Dutra",
"M.",
""
],
[
"Lourenço",
"O.",
""
],
[
"Arbañil",
"J. D. V.",
""
]
] |
The influence of the dark matter mass~($M_{\chi}$) and the Fermi momentum~($k_{F}^{\dm}$) on the $f_0$-mode oscillation frequency, damping time parameter, and tidal deformability of hadronic stars are studied by employing a numerical integration of hydrostatic equilibrium, nonradial oscillation, and tidal deformability equations. The matter inside the hadronic stars follows the NL3* equation of state. We obtain that the influence of $M_{\chi}$ and $k_F^{\dm}$ is observed in the $f_0$-mode, damping tome parameter, and tidal deformability. Finally, the correlation between the tidal deformability of the GW$170817$ event with $M_{\chi}$ and $k_F^{\dm}$ are also investigated.
|
0907.3145
|
Patrick Huber
|
Sanjib K. Agarwalla, Patrick Huber, Jonathan M. Link
|
Constraining sterile neutrinos with a low energy beta-beam
|
12 pages, 5 figures. Minor clarifications and few references added.
Accepted in JHEP
|
JHEP 1001:071,2010
|
10.1007/JHEP01(2010)071
|
VPI-IPNAS-09-09
|
hep-ph hep-ex
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We show that a low energy beta-beam facility can be used to search for
sterile neutrinos by measuring the disappearance of electron anti-neutrinos.
This channel is particularly sensitive since it allows to use inverse beta
decay as detection reaction; thus it is free from hadronic uncertainties,
provided the neutrino energy is below the pion production threshold. This
corresponds to a choice of the Lorentz gamma=30 for the 6He parent ion.
Moreover, a disappearance measurement allows the constraint of sterile neutrino
properties independently of any CP violating effects. A moderate detector size
of a few 100 tons and ion production rates of 2E13 per second are sufficient to
constrain mixing angles as small as \sin^22\theta=0.01 at 99% confidence level.
|
[
{
"created": "Fri, 17 Jul 2009 20:00:37 GMT",
"version": "v1"
},
{
"created": "Thu, 4 Mar 2010 22:04:55 GMT",
"version": "v2"
}
] |
2010-05-07
|
[
[
"Agarwalla",
"Sanjib K.",
""
],
[
"Huber",
"Patrick",
""
],
[
"Link",
"Jonathan M.",
""
]
] |
We show that a low energy beta-beam facility can be used to search for sterile neutrinos by measuring the disappearance of electron anti-neutrinos. This channel is particularly sensitive since it allows to use inverse beta decay as detection reaction; thus it is free from hadronic uncertainties, provided the neutrino energy is below the pion production threshold. This corresponds to a choice of the Lorentz gamma=30 for the 6He parent ion. Moreover, a disappearance measurement allows the constraint of sterile neutrino properties independently of any CP violating effects. A moderate detector size of a few 100 tons and ion production rates of 2E13 per second are sufficient to constrain mixing angles as small as \sin^22\theta=0.01 at 99% confidence level.
|
1505.07912
|
Lauren Pearce
|
Louis Yang, Lauren Pearce, and Alexander Kusenko
|
Leptogenesis via Higgs Condensate Relaxation
|
18 pages, 14 figures
|
Phys. Rev. D 92, 043506 (2015)
|
10.1103/PhysRevD.92.043506
|
FTPI-MINN-15/27
|
hep-ph astro-ph.CO
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
An epoch of Higgs relaxation may occur in the early universe during or
immediately following postinflationary reheating. It has recently been pointed
out that leptogenesis may occur in minimal extensions of the Standard Model
during this epoch. We analyse Higgs relaxation taking into account the effects
of perturbative and non-perturbative decays of the Higgs condensate, and we
present a detailed derivation of the relevant kinetic equations and of the
relevant particle interaction cross sections. We identify the parameter space
in which a sufficiently large asymmetry is generated.
|
[
{
"created": "Fri, 29 May 2015 03:24:26 GMT",
"version": "v1"
},
{
"created": "Mon, 10 Aug 2015 21:24:41 GMT",
"version": "v2"
}
] |
2015-08-26
|
[
[
"Yang",
"Louis",
""
],
[
"Pearce",
"Lauren",
""
],
[
"Kusenko",
"Alexander",
""
]
] |
An epoch of Higgs relaxation may occur in the early universe during or immediately following postinflationary reheating. It has recently been pointed out that leptogenesis may occur in minimal extensions of the Standard Model during this epoch. We analyse Higgs relaxation taking into account the effects of perturbative and non-perturbative decays of the Higgs condensate, and we present a detailed derivation of the relevant kinetic equations and of the relevant particle interaction cross sections. We identify the parameter space in which a sufficiently large asymmetry is generated.
|
2109.00949
|
Vladimir Voronin
|
Sergei Nedelko, Aleksei Nikolskii, Vladimir Voronin
|
Soft gluon fields and anomalous magnetic moment of muon
|
14 pages, 8 figures, 5 tables. Discussion is amended, a figure is
added
| null |
10.1088/1361-6471/ac4a82
| null |
hep-ph
|
http://creativecommons.org/licenses/by/4.0/
|
An impact of nonperturbatively-treated soft gluon modes on the value of
anomalous magnetic moment of muon $a_\mu$ is studied within the mean-field
approach to QCD vacuum and hadronization. It is shown that radial excitations
of vector mesons strongly enhance contribution of hadronic vacuum polarization
to $a_\mu$, doubling the contribution of one intermediate meson processes
compared to result for ground state mesons. The mean field also strongly
influences the hadronic light-by-light scattering contribution due to the
Wilson line in quark propagators.
|
[
{
"created": "Thu, 2 Sep 2021 13:49:38 GMT",
"version": "v1"
},
{
"created": "Wed, 19 Apr 2023 08:16:31 GMT",
"version": "v2"
}
] |
2023-04-20
|
[
[
"Nedelko",
"Sergei",
""
],
[
"Nikolskii",
"Aleksei",
""
],
[
"Voronin",
"Vladimir",
""
]
] |
An impact of nonperturbatively-treated soft gluon modes on the value of anomalous magnetic moment of muon $a_\mu$ is studied within the mean-field approach to QCD vacuum and hadronization. It is shown that radial excitations of vector mesons strongly enhance contribution of hadronic vacuum polarization to $a_\mu$, doubling the contribution of one intermediate meson processes compared to result for ground state mesons. The mean field also strongly influences the hadronic light-by-light scattering contribution due to the Wilson line in quark propagators.
|
1208.2602
|
Jorge Casalderrey-Solana
|
Jorge Casalderrey-Solana
|
Dynamical Quarkonia Suppression in a QGP-Brick
|
21 pages, 19 figures
| null |
10.1007/JHEP03(2013)091
| null |
hep-ph nucl-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
I address the effect that a temperature dependent potential has on the
suppression of heavy quarkonia states in deconfined hadronic matter. I focus on
a simple medium: a homogenous, fixed temperature and deconfined system with a
finite lifetime (QGP-brick). Assuming that all the interactions of a heavy
quark anti-quark ($Q-\bar Q$) pair with the medium can be recast into an
in-medium potential, I solve the time dependent Schr\"odinger equation to
evolve the density matrix which describes the hard pair production and its
connection to the final distribution of hadrons after the medium disappears.
For those temperatures in which bound states survive in the medium, I find a
non-trivial dependence of the production of excited quarkonia states on the
in-medium levels, due to the mixing of vacuum and in-medium wave functions.
This mixing leads, in particular, to the enhancement of the relative abundance
of 2S to 1S states for those systems in which the in-medium ground state of the
$Q-\bar Q$ system is dissolved or close to threshold. I also explore quarkonia
production in a non-homogeneous expanding medium and find that the finite
formation time effects arising from the low binding energies of in-medium
states lead to the insensitivity of the heavy mesons yield to the hottest part
of the system evolution.
|
[
{
"created": "Mon, 13 Aug 2012 14:42:11 GMT",
"version": "v1"
}
] |
2015-06-11
|
[
[
"Casalderrey-Solana",
"Jorge",
""
]
] |
I address the effect that a temperature dependent potential has on the suppression of heavy quarkonia states in deconfined hadronic matter. I focus on a simple medium: a homogenous, fixed temperature and deconfined system with a finite lifetime (QGP-brick). Assuming that all the interactions of a heavy quark anti-quark ($Q-\bar Q$) pair with the medium can be recast into an in-medium potential, I solve the time dependent Schr\"odinger equation to evolve the density matrix which describes the hard pair production and its connection to the final distribution of hadrons after the medium disappears. For those temperatures in which bound states survive in the medium, I find a non-trivial dependence of the production of excited quarkonia states on the in-medium levels, due to the mixing of vacuum and in-medium wave functions. This mixing leads, in particular, to the enhancement of the relative abundance of 2S to 1S states for those systems in which the in-medium ground state of the $Q-\bar Q$ system is dissolved or close to threshold. I also explore quarkonia production in a non-homogeneous expanding medium and find that the finite formation time effects arising from the low binding energies of in-medium states lead to the insensitivity of the heavy mesons yield to the hottest part of the system evolution.
|
hep-ph/0011081
|
Brent D. Nelson
|
Pierre Binetruy, Mary K. Gaillard and Brent D. Nelson
|
One Loop Soft Supersymmetry Breaking Terms in Superstring Effective
Theories
|
49 pages: includes three tables and nine figures
|
Nucl.Phys.B604:32-74,2001
|
10.1016/S0550-3213(00)00759-8
|
LBNL-46970, UCB-PTH-00/37, LPT-Orsay-00/87
|
hep-ph
| null |
We perform a systematic analysis of soft supersymmetry breaking terms at the
one loop level in a large class of string effective field theories. This
includes the so-called anomaly mediated contributions. We illustrate our
results for several classes of orbifold models. In particular, we discuss a
class of models where soft supersymmetry breaking terms are determined by quasi
model independent anomaly mediated contributions, with possibly non-vanishing
scalar masses at the one loop level. We show that the latter contribution
depends on the detailed prescription of the regularization process which is
assumed to represent the Planck scale physics of the underlying fundamental
theory. The usual anomaly mediation case with vanishing scalar masses at one
loop is not found to be generic. However gaugino masses and A-terms always
vanish at tree level if supersymmetry breaking is moduli dominated with the
moduli stabilized at self-dual points, whereas the vanishing of the B-term
depends on the origin of the mu-term in the underlying theory. We also discuss
the supersymmetric spectrum of O-I and O-II models, as well as a model of
gaugino condensation. For reference, explicit spectra corresponding to a Higgs
mass of 114 GeV are given. Finally, we address general strategies for
distinguishing among these models.
|
[
{
"created": "Mon, 6 Nov 2000 22:08:01 GMT",
"version": "v1"
}
] |
2014-11-17
|
[
[
"Binetruy",
"Pierre",
""
],
[
"Gaillard",
"Mary K.",
""
],
[
"Nelson",
"Brent D.",
""
]
] |
We perform a systematic analysis of soft supersymmetry breaking terms at the one loop level in a large class of string effective field theories. This includes the so-called anomaly mediated contributions. We illustrate our results for several classes of orbifold models. In particular, we discuss a class of models where soft supersymmetry breaking terms are determined by quasi model independent anomaly mediated contributions, with possibly non-vanishing scalar masses at the one loop level. We show that the latter contribution depends on the detailed prescription of the regularization process which is assumed to represent the Planck scale physics of the underlying fundamental theory. The usual anomaly mediation case with vanishing scalar masses at one loop is not found to be generic. However gaugino masses and A-terms always vanish at tree level if supersymmetry breaking is moduli dominated with the moduli stabilized at self-dual points, whereas the vanishing of the B-term depends on the origin of the mu-term in the underlying theory. We also discuss the supersymmetric spectrum of O-I and O-II models, as well as a model of gaugino condensation. For reference, explicit spectra corresponding to a Higgs mass of 114 GeV are given. Finally, we address general strategies for distinguishing among these models.
|
hep-ph/0410209
|
Helmut Eberl Dr.
|
H. Eberl
|
Higgs boson decays into charginos and neutralinos including full
one-loop corrections
|
4 pages, 2 figures. Talk given at the International Conference on
Linear Colliders (LCWS 04), Paris, April 19 - 23, 2004
| null | null |
HEPHY-PUB 794/04
|
hep-ph
| null |
We present the one-loop corrected decay widths of a neutral (charged) Higgs
boson into a chargino or neutralino pair (chargino and neutralino) in the
CP-conserving MSSM. The chargino and neutralino parameters are renormalized in
the on-shell scheme and it is shown that the correction due to the
chargino/neutralino mass matrix renormalization is comparable to the
conventional vertex correction. The full corrections are typically of the order
of 10%.
|
[
{
"created": "Thu, 14 Oct 2004 15:27:20 GMT",
"version": "v1"
}
] |
2007-05-23
|
[
[
"Eberl",
"H.",
""
]
] |
We present the one-loop corrected decay widths of a neutral (charged) Higgs boson into a chargino or neutralino pair (chargino and neutralino) in the CP-conserving MSSM. The chargino and neutralino parameters are renormalized in the on-shell scheme and it is shown that the correction due to the chargino/neutralino mass matrix renormalization is comparable to the conventional vertex correction. The full corrections are typically of the order of 10%.
|
1503.05412
|
Pyungwon Ko
|
P. Ko (KIAS)
|
Dark matter, dark radiation and Higgs phenomenology in the hidden sector
DM models
|
6 pages, 3 figures. To appear in the proceeding of the 5th Workshop
on Theory, Phenomenology and Experiments in Flavour Physics, Capri-2014
| null | null | null |
hep-ph astro-ph.HE
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
I present a class of hidden sector dark matter (DM) models with local dark
gauge symmetries, where DM is stable due to unbroken local dark gauge symmetry,
or due topology, or it is long-lived because of some accidental symme- tries,
and the particle contents and their dynamics are completely fixed by local
gauge symmetries. In these models, one have two types of natural force
mediators, dark gauge bosons and dark Higgs boson, which would affect DM and
Higgs phenomenology in important ways. I discuss various phenomenological
issues including the GeV scale gamma-ray excess from the galactic center (GC),
(in)direct detection signatures, dark radiation, Higgs phenomenology and Higgs
inflation assisted by dark Higgs.
|
[
{
"created": "Wed, 18 Mar 2015 13:53:14 GMT",
"version": "v1"
}
] |
2015-03-19
|
[
[
"Ko",
"P.",
"",
"KIAS"
]
] |
I present a class of hidden sector dark matter (DM) models with local dark gauge symmetries, where DM is stable due to unbroken local dark gauge symmetry, or due topology, or it is long-lived because of some accidental symme- tries, and the particle contents and their dynamics are completely fixed by local gauge symmetries. In these models, one have two types of natural force mediators, dark gauge bosons and dark Higgs boson, which would affect DM and Higgs phenomenology in important ways. I discuss various phenomenological issues including the GeV scale gamma-ray excess from the galactic center (GC), (in)direct detection signatures, dark radiation, Higgs phenomenology and Higgs inflation assisted by dark Higgs.
|
hep-ph/9412252
|
Wojciech Broniowski
|
Thomas D. Cohen and Wojciech Broniowski
|
Pseudo-Goldstone Modes in Isospin-Asymmetric Nuclear Matter
|
15 pages, ReVTeX, no figures
|
Phys.Lett. B348 (1995) 12-18
|
10.1016/0370-2693(95)00129-9
|
DOE/ER/40561-173--INT-94-00-77 and INP-1683/PH
|
hep-ph
| null |
We analyze the chiral limit in dense isospin-asymmetric nuclear matter. It is
shown that the pseudo-Goldstone modes in this system are qualitatively
different from the case of isospin-symmetric matter.
|
[
{
"created": "Wed, 7 Dec 1994 10:32:00 GMT",
"version": "v1"
}
] |
2009-10-28
|
[
[
"Cohen",
"Thomas D.",
""
],
[
"Broniowski",
"Wojciech",
""
]
] |
We analyze the chiral limit in dense isospin-asymmetric nuclear matter. It is shown that the pseudo-Goldstone modes in this system are qualitatively different from the case of isospin-symmetric matter.
|
hep-ph/9810546
|
Gavin Salam
|
G. Bottazzi, G. Marchesini, G.P. Salam and M. Scorletti
|
Small-x one-particle-inclusive quantities in the CCFM approach
|
33 pages, 10 figures, uses cite.sty and JHEP.cls (both included).
Version 2 includes additional and updated references
|
JHEP 9812:011,1998
|
10.1088/1126-6708/1998/12/011
|
IFUM-634-FT
|
hep-ph
| null |
This article presents the results of a quantitative study of the small-x data
at HERA, using the CCFM equation. The first step consists of choosing the
version of the CCFM equation to be used, corresponding to selecting a
particular subset of next-to-leading-logarithmic corrections --- the choice is
constrained by requiring a phenomenologically reasonable small-x growth. For
the time being, the parts of the splitting functions that are finite at z=0
have been left out. We then examine results for F_2^c, R, the transverse energy
flow, the charged-particle transverse-momentum spectrum and the forward-jet
cross section and compare to data. While some of the data is reproduced better
than with DGLAP-based calculations, the agreement is not entirely satisfactory,
suggesting that the approach developed here is not yet suitable for detailed
phenomenology. We discuss why, and suggest directions for future work.
|
[
{
"created": "Fri, 30 Oct 1998 14:45:30 GMT",
"version": "v1"
},
{
"created": "Thu, 4 Mar 1999 14:45:54 GMT",
"version": "v2"
}
] |
2014-11-17
|
[
[
"Bottazzi",
"G.",
""
],
[
"Marchesini",
"G.",
""
],
[
"Salam",
"G. P.",
""
],
[
"Scorletti",
"M.",
""
]
] |
This article presents the results of a quantitative study of the small-x data at HERA, using the CCFM equation. The first step consists of choosing the version of the CCFM equation to be used, corresponding to selecting a particular subset of next-to-leading-logarithmic corrections --- the choice is constrained by requiring a phenomenologically reasonable small-x growth. For the time being, the parts of the splitting functions that are finite at z=0 have been left out. We then examine results for F_2^c, R, the transverse energy flow, the charged-particle transverse-momentum spectrum and the forward-jet cross section and compare to data. While some of the data is reproduced better than with DGLAP-based calculations, the agreement is not entirely satisfactory, suggesting that the approach developed here is not yet suitable for detailed phenomenology. We discuss why, and suggest directions for future work.
|
hep-ph/9508357
|
Paul TurcotteT
|
Darwin Chang, Shih-Chang Lee and Paul Turcotte
|
The Effect of Top Quark Polarization at Hadronic Colliders
| null |
Chin.J.Phys. 34 (1996) 748-760
| null | null |
hep-ph
| null |
We derive a simple analytic expression for q \bar{q}, g g -> t \bar{t} -> b
W^+ \bar{b} W^- -> b \bar{l} \nu_l \bar{b} l' \bar{\nu_{l'}} for on shell
intermediate states with the interference effects due to the polarizations of
the t and \bar{t}. We then investigate how this effect may be measured at
Tevatron or other hadronic colliders.
|
[
{
"created": "Wed, 23 Aug 1995 14:30:56 GMT",
"version": "v1"
}
] |
2007-05-23
|
[
[
"Chang",
"Darwin",
""
],
[
"Lee",
"Shih-Chang",
""
],
[
"Turcotte",
"Paul",
""
]
] |
We derive a simple analytic expression for q \bar{q}, g g -> t \bar{t} -> b W^+ \bar{b} W^- -> b \bar{l} \nu_l \bar{b} l' \bar{\nu_{l'}} for on shell intermediate states with the interference effects due to the polarizations of the t and \bar{t}. We then investigate how this effect may be measured at Tevatron or other hadronic colliders.
|
1111.2128
|
Janardan Singh prasad
|
Janardan P. Singh and Aditya B. Patel
|
Quark distributions and gluon contents of eta and etaprime
|
14 pages, 7 figures
| null |
10.1088/0954-3899/39/1/015006
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Using QCD sum rule, we calculate valance quark distribution functions of
{\eta} and of {\eta}' in chiral limit. Extrapolating the calculated quark
distribution functions at both end regions, their first two moments have been
calculated and compared with those of other hadrons.
|
[
{
"created": "Wed, 9 Nov 2011 08:31:14 GMT",
"version": "v1"
}
] |
2015-06-03
|
[
[
"Singh",
"Janardan P.",
""
],
[
"Patel",
"Aditya B.",
""
]
] |
Using QCD sum rule, we calculate valance quark distribution functions of {\eta} and of {\eta}' in chiral limit. Extrapolating the calculated quark distribution functions at both end regions, their first two moments have been calculated and compared with those of other hadrons.
|
2101.10693
|
Clare Burrage
|
Philippe Brax and Clare Burrage
|
Screening the Higgs portal
|
38 pages, 4 figures. v2: Additional references added
|
Phys. Rev. D 104, 015011 (2021)
|
10.1103/PhysRevD.104.015011
| null |
hep-ph astro-ph.CO hep-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Light scalar fields that couple to matter through the Higgs portal mediate
long range fifth forces. We show how the mixing of a light scalar with the
Higgs field can lead to this fifth force being screened around macroscopic
objects. This behaviour can only be seen by considering both scalar fields as
dynamical, and is missed if the mixing between the Higgs field and the scalar
field is not taken into account. We explain under which conditions the naive
"integrating out" procedure fails, i.e. when the mass matrix of the
Higgs-scalars system has a nearly vanishing mass eigenvalue. The resulting flat
direction in field space can be lifted at the quadratic order in the presence
of matter and the resulting fifth force mediated by the Higgs portal can be
screened either when the gravitating objects are large enough or their surface
Newton potential exceeds a threshold. Finally we discuss the implications of
these results for nearly massless relaxion models.
|
[
{
"created": "Tue, 26 Jan 2021 10:34:30 GMT",
"version": "v1"
},
{
"created": "Wed, 10 Feb 2021 16:28:58 GMT",
"version": "v2"
}
] |
2021-07-14
|
[
[
"Brax",
"Philippe",
""
],
[
"Burrage",
"Clare",
""
]
] |
Light scalar fields that couple to matter through the Higgs portal mediate long range fifth forces. We show how the mixing of a light scalar with the Higgs field can lead to this fifth force being screened around macroscopic objects. This behaviour can only be seen by considering both scalar fields as dynamical, and is missed if the mixing between the Higgs field and the scalar field is not taken into account. We explain under which conditions the naive "integrating out" procedure fails, i.e. when the mass matrix of the Higgs-scalars system has a nearly vanishing mass eigenvalue. The resulting flat direction in field space can be lifted at the quadratic order in the presence of matter and the resulting fifth force mediated by the Higgs portal can be screened either when the gravitating objects are large enough or their surface Newton potential exceeds a threshold. Finally we discuss the implications of these results for nearly massless relaxion models.
|
hep-ph/9908425
|
Masashi Wakamatsu Ohtsubo Laboratory
|
M. Wakamatsu and T. Watabe
|
Do we expect light flavor sea-quark asymmetry also for the
spin-dependent distribution functions of the nucleon?
|
14pages, including 5 eps_figures with epsbox.sty, latex
|
Phys.Rev.D62:017506,2000
|
10.1103/PhysRevD.62.017506
|
OU-HEP324
|
hep-ph
| null |
After taking account of the scale dependence by means of the standard DGLAP
evolution equation, the theoretical predictions of the chiral quark soliton
model for the unpolarized and longitudinally polarized structure functions of
the nucleon are compared with the recent high energy data. The theory is shown
to explain all the qualitative features of the experiments, including the NMC
data for $F_2^p (x) - F_2^n (x)$, $F_2^n (x) / F_2^p (x)$, the Hermes and NuSea
data for $\bar{d}(x) - \bar{u}(x)$, the EMC and SMC data for $g_1^p(x)$,
$g_1^n(x)$ and $g_1^d(x)$. Among others, flavor asymmetry of the longitudinally
polarized sea-quark distributions is a remarkable prediction of this model,
i.e., it predicts that $\Delta \bar{d}(x) - \Delta \bar{u}(x) = C x^{\alpha} [
\bar{d}(x) - \bar{u}(x)]$ with a sizable negative coefficient $C \simeq -2.0$
(and $\alpha \simeq 0.12$) in qualitative consistency with the recent
semi-phenomenological analysis by Morii and Yamanishi.
|
[
{
"created": "Fri, 20 Aug 1999 05:56:10 GMT",
"version": "v1"
}
] |
2014-11-17
|
[
[
"Wakamatsu",
"M.",
""
],
[
"Watabe",
"T.",
""
]
] |
After taking account of the scale dependence by means of the standard DGLAP evolution equation, the theoretical predictions of the chiral quark soliton model for the unpolarized and longitudinally polarized structure functions of the nucleon are compared with the recent high energy data. The theory is shown to explain all the qualitative features of the experiments, including the NMC data for $F_2^p (x) - F_2^n (x)$, $F_2^n (x) / F_2^p (x)$, the Hermes and NuSea data for $\bar{d}(x) - \bar{u}(x)$, the EMC and SMC data for $g_1^p(x)$, $g_1^n(x)$ and $g_1^d(x)$. Among others, flavor asymmetry of the longitudinally polarized sea-quark distributions is a remarkable prediction of this model, i.e., it predicts that $\Delta \bar{d}(x) - \Delta \bar{u}(x) = C x^{\alpha} [ \bar{d}(x) - \bar{u}(x)]$ with a sizable negative coefficient $C \simeq -2.0$ (and $\alpha \simeq 0.12$) in qualitative consistency with the recent semi-phenomenological analysis by Morii and Yamanishi.
|
2208.13608
|
Ananya Tapadar
|
Sougata Ganguly, Sourov Roy, Ananya Tapadar
|
Secluded Dark Sector and Muon $(g-2)$ in the Light of Fast Expanding
Universe
|
Fig.9 modified, minor changes in conclusion, reference list updated,
published in JCAP
| null |
10.1088/1475-7516/2023/02/044
| null |
hep-ph
|
http://creativecommons.org/licenses/by/4.0/
|
The lack of information before Big Bang Neucleosynthesis (BBN) allow us to
assume the presence of a new species $\phi$ whose energy density redshifts as
$a^{-(4+n)}$ where $n>0$ and $a$ is the scale factor. This non-standard
cosmological setup facilitates a larger portal coupling $(\epsilon)$ between
the dark and the visible sectors even when the two sectors are not in thermal
equilibrium. Here, we have considered $U(1)_{L_\mu-L_\tau}\otimes U(1)_X$ gauge
extension of the Standard Model (SM) and studied different phases of the
cosmological evolution of a thermally decoupled dark sector such as leak-in,
freeze-in, reannihilation, and late-time annihilation in the presence of fast
expansion. Due to the tree level kinetic mixing between $U(1)_X$ and
$U(1)_{L_\mu-L_\tau}$ gauge bosons, the dark sector couples with the $\mu$ and
$\tau$ flavored leptons of the SM. We show that in our scenario it is possible
to reconcile the dark matter relic density and muon $(g-2)$ anomaly. In
particular, we show that for $2\times 10^{-4} \lesssim \epsilon \lesssim
10^{-3}$, $5.5{\rm MeV} \lesssim m_{Z^\prime} \lesssim 200{\rm MeV}$, $n=4$,
and $1{\rm TeV} \lesssim m_\chi \lesssim 10{\rm TeV}$ relic density constraint
of dark matter, constraint from muon $(g-2)$ anomaly, and other cosmological,
astrophysical constraints are satisfied.
|
[
{
"created": "Mon, 29 Aug 2022 14:00:33 GMT",
"version": "v1"
},
{
"created": "Fri, 24 Feb 2023 06:46:20 GMT",
"version": "v2"
}
] |
2023-02-27
|
[
[
"Ganguly",
"Sougata",
""
],
[
"Roy",
"Sourov",
""
],
[
"Tapadar",
"Ananya",
""
]
] |
The lack of information before Big Bang Neucleosynthesis (BBN) allow us to assume the presence of a new species $\phi$ whose energy density redshifts as $a^{-(4+n)}$ where $n>0$ and $a$ is the scale factor. This non-standard cosmological setup facilitates a larger portal coupling $(\epsilon)$ between the dark and the visible sectors even when the two sectors are not in thermal equilibrium. Here, we have considered $U(1)_{L_\mu-L_\tau}\otimes U(1)_X$ gauge extension of the Standard Model (SM) and studied different phases of the cosmological evolution of a thermally decoupled dark sector such as leak-in, freeze-in, reannihilation, and late-time annihilation in the presence of fast expansion. Due to the tree level kinetic mixing between $U(1)_X$ and $U(1)_{L_\mu-L_\tau}$ gauge bosons, the dark sector couples with the $\mu$ and $\tau$ flavored leptons of the SM. We show that in our scenario it is possible to reconcile the dark matter relic density and muon $(g-2)$ anomaly. In particular, we show that for $2\times 10^{-4} \lesssim \epsilon \lesssim 10^{-3}$, $5.5{\rm MeV} \lesssim m_{Z^\prime} \lesssim 200{\rm MeV}$, $n=4$, and $1{\rm TeV} \lesssim m_\chi \lesssim 10{\rm TeV}$ relic density constraint of dark matter, constraint from muon $(g-2)$ anomaly, and other cosmological, astrophysical constraints are satisfied.
|
hep-ph/9505381
| null |
Eugene Golowich
|
Two Comparative Case Studies of $b$-quark and $c$-quark Physics
|
7 pages, LaTex, 4 figures appended, to appear in Proc. of XXXth
Rencontres de Moriond, `QCD and High Energy Hadronic Interactions', Les Arcs,
France, 3/95
| null | null |
UMHEP-419
|
hep-ph
| null |
We discuss prospects for detecting the two charm-related phenomena of
$D^0$-${\bar D}^0$ mixing and weak radiative decays of $D$ mesons ({\it e.g.}
$D\to K^* + \gamma$). A general update of particle-antiparticle mixing for the
pseudoscalar mesons is presented and the dynamics of mixing is reviewed, with
application especially to the $D^0$-${\bar D}^0$ system. The radiative weak
decays of $B$ mesons is then considered, and the problem of hadronic
uncertainties is reviewed. Finally, the technique of calculating radiative weak
decays for charm mesons is explained.
|
[
{
"created": "Thu, 25 May 1995 14:43:23 GMT",
"version": "v1"
}
] |
2007-05-23
|
[
[
"Golowich",
"Eugene",
""
]
] |
We discuss prospects for detecting the two charm-related phenomena of $D^0$-${\bar D}^0$ mixing and weak radiative decays of $D$ mesons ({\it e.g.} $D\to K^* + \gamma$). A general update of particle-antiparticle mixing for the pseudoscalar mesons is presented and the dynamics of mixing is reviewed, with application especially to the $D^0$-${\bar D}^0$ system. The radiative weak decays of $B$ mesons is then considered, and the problem of hadronic uncertainties is reviewed. Finally, the technique of calculating radiative weak decays for charm mesons is explained.
|
1103.3351
|
Serguei Molodtsov
|
S. V. Molodtsov, G. M. Zinovjev
|
Thermodynamics of quark quasi-particles ensemble
|
15 pages, 12 figures, text slightly improved
|
Phys.Rev.D84:036011,2011
|
10.1103/PhysRevD.84.036011
| null |
hep-ph nucl-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
The features of hot and dense gas of quarks which are considered as the
quasi-particles of the model Hamiltonian with four-fermion interaction are
studied. Being adapted to the Nambu-Jona-Lasinio model this approach allows us
to accommodate a phase transition similar to the nuclear liquid-gas one at the
proper scale and to argue an existence of the mixed (inhomogeneous) phase of
vacuum and normal baryonic matter as a plausible scenario of chiral symmetry
(partial) restoration. Analyzing the transition layer between two phases we
estimate the surface tension coefficient and speculate on the possible
existence of quark droplet.
|
[
{
"created": "Thu, 17 Mar 2011 07:51:26 GMT",
"version": "v1"
},
{
"created": "Tue, 10 May 2011 06:27:45 GMT",
"version": "v2"
},
{
"created": "Thu, 23 Jun 2011 16:05:25 GMT",
"version": "v3"
}
] |
2015-03-19
|
[
[
"Molodtsov",
"S. V.",
""
],
[
"Zinovjev",
"G. M.",
""
]
] |
The features of hot and dense gas of quarks which are considered as the quasi-particles of the model Hamiltonian with four-fermion interaction are studied. Being adapted to the Nambu-Jona-Lasinio model this approach allows us to accommodate a phase transition similar to the nuclear liquid-gas one at the proper scale and to argue an existence of the mixed (inhomogeneous) phase of vacuum and normal baryonic matter as a plausible scenario of chiral symmetry (partial) restoration. Analyzing the transition layer between two phases we estimate the surface tension coefficient and speculate on the possible existence of quark droplet.
|
2010.14545
|
Anna M. Suliga
|
Anna M. Suliga, Irene Tamborra (Niels Bohr Institute)
|
Astrophysical constraints on non-standard coherent neutrino-nucleus
scattering
|
20 pages, 12 figures. Discussion on the forecasted bounds extended,
conclusions unchanged. Matches version accepted in Phys. Rev. D
|
Phys. Rev. D 103, 083002 (2021)
|
10.1103/PhysRevD.103.083002
| null |
hep-ph astro-ph.HE
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
The exciting possibility of detecting supernova, solar, and atmospheric
neutrinos with coherent neutrino-nucleus scattering detectors is within reach,
opening up new avenues to probe New Physics. We explore the possibility of
constraining non-standard coherent neutrino-nucleus scattering through
astrophysical neutrinos. Sensitivity bounds on the mass and coupling of the new
mediator are obtained by inspecting the modifications induced by the new
interaction on the recoil rate observable in the upcoming RES-NOVA and DARWIN
facilities. Under the assumption of optimal background tagging, the detection
of neutrinos from a galactic supernova burst, or one-year exposure to solar and
atmospheric neutrinos, will place the most stringent bounds for mediator
couplings $g \gtrsim 10^{-5}$ and mediator masses between 1 and 100 MeV. A
similar, but slightly improved, potential to COHERENT will be provided for
larger mediator masses. In particular, RES-NOVA and DARWIN may potentially
provide one order of magnitude tighter constraints than XENON1T on the mediator
coupling. Non-standard coherent neutrino-nucleus scattering may also force
neutrinos to be trapped in the supernova core; this argument allows to probe
the region of the parameter space with $g \gtrsim 10^{-4}$, which is currently
excluded by other coherent neutrino-nucleus scattering facilities or other
astrophysical and terrestrial constraints.
|
[
{
"created": "Tue, 27 Oct 2020 18:29:49 GMT",
"version": "v1"
},
{
"created": "Fri, 12 Mar 2021 16:33:10 GMT",
"version": "v2"
}
] |
2021-04-07
|
[
[
"Suliga",
"Anna M.",
"",
"Niels Bohr Institute"
],
[
"Tamborra",
"Irene",
"",
"Niels Bohr Institute"
]
] |
The exciting possibility of detecting supernova, solar, and atmospheric neutrinos with coherent neutrino-nucleus scattering detectors is within reach, opening up new avenues to probe New Physics. We explore the possibility of constraining non-standard coherent neutrino-nucleus scattering through astrophysical neutrinos. Sensitivity bounds on the mass and coupling of the new mediator are obtained by inspecting the modifications induced by the new interaction on the recoil rate observable in the upcoming RES-NOVA and DARWIN facilities. Under the assumption of optimal background tagging, the detection of neutrinos from a galactic supernova burst, or one-year exposure to solar and atmospheric neutrinos, will place the most stringent bounds for mediator couplings $g \gtrsim 10^{-5}$ and mediator masses between 1 and 100 MeV. A similar, but slightly improved, potential to COHERENT will be provided for larger mediator masses. In particular, RES-NOVA and DARWIN may potentially provide one order of magnitude tighter constraints than XENON1T on the mediator coupling. Non-standard coherent neutrino-nucleus scattering may also force neutrinos to be trapped in the supernova core; this argument allows to probe the region of the parameter space with $g \gtrsim 10^{-4}$, which is currently excluded by other coherent neutrino-nucleus scattering facilities or other astrophysical and terrestrial constraints.
|
hep-ph/9810377
|
Fred Cooper
|
Fred Cooper
|
Initial Value Problems in Quantum Field Theory
|
7 pages uses ws-p8-50x6-00.cls To be published in the proceedings of
the Sixth International Conference on Path Integrals, Florence Italy, 1998 by
World Scientific
| null | null |
BC-hep-98-1
|
hep-ph
| null |
We review our work on initial value problems in Quantum Field Theory which is
based on using Schwinger's Closed Time Path formalism and a large-N expansion
of the Path Integral.
|
[
{
"created": "Thu, 15 Oct 1998 18:13:43 GMT",
"version": "v1"
}
] |
2007-05-23
|
[
[
"Cooper",
"Fred",
""
]
] |
We review our work on initial value problems in Quantum Field Theory which is based on using Schwinger's Closed Time Path formalism and a large-N expansion of the Path Integral.
|
1903.08359
|
Yoshiki Yatagai
|
Nobuhito Maru and Yoshiki Yatagai
|
Fermion Mass Hierarchy in Grand Gauge-Higgs Unification
|
29 pages, 5 figures
|
Prog Theor Exp Phys (2019)
|
10.1093/ptep/ptz083
|
OCU-PHYS 499, NITEP 10
|
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Grand gauge-Higgs unification of five dimensional $SU(6)$ gauge theory on an
orbifold $S^1/Z_2$ is discussed. The Standard model (SM) fermions are
introduced on one of the boundaries and some massive bulk fields are also
introduced so that they couple to the SM fermions through the mass terms on the
boundary. Integrating out the bulk fields generates the SM fermion masses with
exponentially small bulk mass dependences. The SM fermion masses except for top
quark are shown to be reproduced by mild tuning the bulk masses. One-loop Higgs
potential is calculated and it is shown that the electroweak symmetry breaking
occurs by introducing additional bulk fields. Higgs boson mass is also
computed.
|
[
{
"created": "Wed, 20 Mar 2019 07:04:00 GMT",
"version": "v1"
},
{
"created": "Thu, 21 Mar 2019 13:19:08 GMT",
"version": "v2"
}
] |
2019-12-06
|
[
[
"Maru",
"Nobuhito",
""
],
[
"Yatagai",
"Yoshiki",
""
]
] |
Grand gauge-Higgs unification of five dimensional $SU(6)$ gauge theory on an orbifold $S^1/Z_2$ is discussed. The Standard model (SM) fermions are introduced on one of the boundaries and some massive bulk fields are also introduced so that they couple to the SM fermions through the mass terms on the boundary. Integrating out the bulk fields generates the SM fermion masses with exponentially small bulk mass dependences. The SM fermion masses except for top quark are shown to be reproduced by mild tuning the bulk masses. One-loop Higgs potential is calculated and it is shown that the electroweak symmetry breaking occurs by introducing additional bulk fields. Higgs boson mass is also computed.
|
2109.15248
|
Silvano Simula
|
G. Martinelli, S. Simula and L. Vittorio
|
Exclusive determinations of $\vert V_{cb} \vert$ and $R(D^{*})$ through
unitarity
|
20 pages, 5 figures, 2 tables. Revised version including appendices
describing the DM method, the application of the unitarity filters and the
implementation of the kinematical constraints. Results and conclusions
unchanged. Matches published version in EPJC
| null |
10.1140/epjc/s10052-022-11050-0
| null |
hep-ph hep-ex hep-lat
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
In this work we apply the Dispersive Matrix (DM) method of Refs. [1,2] to the
lattice computations of the Form Factors (FFs) entering the semileptonic $B \to
D^* \ell \nu_\ell$ decays, recently produced by the FNAL/MILC Collaborations
[3] at small, but non-vanishing values of the recoil variable ($w-1$). Thanks
to the DM method we obtain the FFs in the whole kinematical range accessible to
the decay in a completely model-independent and non-perturbative way,
implementing exactly both unitarity and kinematical constraints. Using our
theoretical bands of the FFs we extract $\vert V_{cb} \vert$ from the
experimental data and compute the theoretical value of $R(D^*)$. Our final
result for $\vert V_{cb} \vert$ reads $\vert V_{cb} \vert = (41.3 \pm 1.7)
\cdot 10^{-3}$, compatible with the most recent inclusive estimate at the
$0.5\sigma$ level. Moreover, we obtain the pure theoretical value $R(D^*) =
0.275 \pm 0.008$, which is compatible with the experimental world average at
the $\sim 1.3 \sigma$ level.
|
[
{
"created": "Thu, 30 Sep 2021 16:28:43 GMT",
"version": "v1"
},
{
"created": "Thu, 20 Jan 2022 14:57:27 GMT",
"version": "v2"
},
{
"created": "Thu, 1 Dec 2022 14:27:38 GMT",
"version": "v3"
}
] |
2022-12-21
|
[
[
"Martinelli",
"G.",
""
],
[
"Simula",
"S.",
""
],
[
"Vittorio",
"L.",
""
]
] |
In this work we apply the Dispersive Matrix (DM) method of Refs. [1,2] to the lattice computations of the Form Factors (FFs) entering the semileptonic $B \to D^* \ell \nu_\ell$ decays, recently produced by the FNAL/MILC Collaborations [3] at small, but non-vanishing values of the recoil variable ($w-1$). Thanks to the DM method we obtain the FFs in the whole kinematical range accessible to the decay in a completely model-independent and non-perturbative way, implementing exactly both unitarity and kinematical constraints. Using our theoretical bands of the FFs we extract $\vert V_{cb} \vert$ from the experimental data and compute the theoretical value of $R(D^*)$. Our final result for $\vert V_{cb} \vert$ reads $\vert V_{cb} \vert = (41.3 \pm 1.7) \cdot 10^{-3}$, compatible with the most recent inclusive estimate at the $0.5\sigma$ level. Moreover, we obtain the pure theoretical value $R(D^*) = 0.275 \pm 0.008$, which is compatible with the experimental world average at the $\sim 1.3 \sigma$ level.
|
hep-ph/0012331
|
Masashi Wakamatsu Ohtsubo Laboratory
|
M. Wakamatsu
|
Chiral-odd distribution functions in the chiral quark soliton model
|
12 pages, latex, 5 eps_fig
|
Phys.Lett. B509 (2001) 59-68
|
10.1016/S0370-2693(01)00200-3
|
OU-HEP-374
|
hep-ph
| null |
The recent measurements of azimuthal single spin asymmetries by the HERMES
collaboration has opened up new possibility to measure chiral-odd distribution
functions through semi-inclusive deep-inelastic scatterings. Here, predictions
are given for the twist-2 and twist-3 chiral-odd distribution functions of the
nucleon within the framework of the chiral quark soliton model, with full
inclusion of the vacuum polarization effects as well as the subleading $1/N_c$
corrections. The importance of the vacuum polarization effects is demonstrated
by showing that the so-called Soffer inequality holds not only for the quark
distributions but also for the antiquark ones.
|
[
{
"created": "Mon, 25 Dec 2000 08:13:04 GMT",
"version": "v1"
},
{
"created": "Tue, 26 Dec 2000 01:24:08 GMT",
"version": "v2"
}
] |
2009-10-31
|
[
[
"Wakamatsu",
"M.",
""
]
] |
The recent measurements of azimuthal single spin asymmetries by the HERMES collaboration has opened up new possibility to measure chiral-odd distribution functions through semi-inclusive deep-inelastic scatterings. Here, predictions are given for the twist-2 and twist-3 chiral-odd distribution functions of the nucleon within the framework of the chiral quark soliton model, with full inclusion of the vacuum polarization effects as well as the subleading $1/N_c$ corrections. The importance of the vacuum polarization effects is demonstrated by showing that the so-called Soffer inequality holds not only for the quark distributions but also for the antiquark ones.
|
hep-ph/0011001
|
Jefferson Bjoraker
|
Jefferson Bjoraker (MINNU) and Raju Venugopalan (BNL & RIKEN BNL)
|
Solution of the Boltzmann equation for gluons after a heavy ion
collision
|
To appear in the proceedings for ``Strong and Electroweak matter''
(SEWM2000), Marseille, France, 14-17 June 2000
| null |
10.1142/9789812799913_0031
|
NUC-MINN-00/24--T, BNL-NT-00/23
|
hep-ph
| null |
A non-linear Boltzmann equation describing the time evolution of a partonic
system in the central rapidity region after a heavy ion collision is solved
numerically. A particular model of the collinear logarithmic divergences due to
small angle scattering is employed in the numerical solution. The system is
followed until it reaches kinetic equilibrium where the equilibration time,
temperature and chemical potential are determined for both RHIC and LHC.
|
[
{
"created": "Wed, 1 Nov 2000 01:25:21 GMT",
"version": "v1"
}
] |
2017-08-23
|
[
[
"Bjoraker",
"Jefferson",
"",
"MINNU"
],
[
"Venugopalan",
"Raju",
"",
"BNL & RIKEN BNL"
]
] |
A non-linear Boltzmann equation describing the time evolution of a partonic system in the central rapidity region after a heavy ion collision is solved numerically. A particular model of the collinear logarithmic divergences due to small angle scattering is employed in the numerical solution. The system is followed until it reaches kinetic equilibrium where the equilibration time, temperature and chemical potential are determined for both RHIC and LHC.
|
hep-ph/9808459
|
Fornengo Nicolao
|
A. Bottino (1), F. Donato (1), N. Fornengo (1) and S. Scopel (2) ((1)
Universita' di Torino and INFN, Sezione di Torino, Italy, (2) Universidad de
Zaragoza, Spain and INFN)
|
Compatibility of the new DAMA/NaI data on an annual modulation effect in
WIMP direct search with a relic neutralino in supergravity schemes
|
10 pages, ReVTeX, 13 figures (included as PS files)
|
Phys.Rev. D59 (1999) 095004
|
10.1103/PhysRevD.59.095004
|
DFTT 48/98
|
hep-ph astro-ph
| null |
Recent results of the DAMA/NaI experiment for WIMP direct detection point to
a possible annual modulation effect in the detection rate. We show that these
results, when interpreted in terms of a relic neutralino, are compatible with
supergravity models. Together with the universal SUGRA scheme, we also consider
SUGRA models where the unification condition in the Higgs mass parameters at
GUT scale is relaxed.
|
[
{
"created": "Fri, 28 Aug 1998 16:11:26 GMT",
"version": "v1"
}
] |
2009-10-31
|
[
[
"Bottino",
"A.",
""
],
[
"Donato",
"F.",
""
],
[
"Fornengo",
"N.",
""
],
[
"Scopel",
"S.",
""
]
] |
Recent results of the DAMA/NaI experiment for WIMP direct detection point to a possible annual modulation effect in the detection rate. We show that these results, when interpreted in terms of a relic neutralino, are compatible with supergravity models. Together with the universal SUGRA scheme, we also consider SUGRA models where the unification condition in the Higgs mass parameters at GUT scale is relaxed.
|
hep-ph/0012099
|
Adam Falk
|
Adam F. Falk, Adam Lewandowski and Alexey A. Petrov
|
Effects from the charm scale in K+ -> pi+ nu nubar
|
9 pages, 3 figures; Eq. (15) fixed, all results and conclusions
unaltered
|
Phys.Lett. B505 (2001) 107-112
|
10.1016/S0370-2693(01)00343-4
|
CLNS-00/1707, JHU-TIPAC-20007
|
hep-ph
| null |
We consider contributions to the rare decay K+ -> pi+ nu nubar which become
nonlocal at the charm scale. Compared to the leading term, such amplitudes are
suppressed by two powers of mK/mc and could potentially give corrections at the
level of 15%. We compute the leading coefficients of the subleading dimension
eight operators in the effective theory below the charm mass. The matrix
elements of these operators cannot all be calculated from first principles and
some must be modeled. We find that these contributions are likely to be small,
but the estimate is sufficiently uncertain that the result may be as large as
the existing theoretical uncertainty from other sources.
|
[
{
"created": "Fri, 8 Dec 2000 18:54:01 GMT",
"version": "v1"
},
{
"created": "Thu, 14 Dec 2000 14:25:53 GMT",
"version": "v2"
}
] |
2009-10-31
|
[
[
"Falk",
"Adam F.",
""
],
[
"Lewandowski",
"Adam",
""
],
[
"Petrov",
"Alexey A.",
""
]
] |
We consider contributions to the rare decay K+ -> pi+ nu nubar which become nonlocal at the charm scale. Compared to the leading term, such amplitudes are suppressed by two powers of mK/mc and could potentially give corrections at the level of 15%. We compute the leading coefficients of the subleading dimension eight operators in the effective theory below the charm mass. The matrix elements of these operators cannot all be calculated from first principles and some must be modeled. We find that these contributions are likely to be small, but the estimate is sufficiently uncertain that the result may be as large as the existing theoretical uncertainty from other sources.
|
1612.09501
|
Tong Li
|
Tong Li
|
Simplified dark matter models in the light of AMS-02 antiproton data
|
16 pages, 6 figures, 1 table. arXiv admin note: text overlap with
arXiv:1509.02219
| null |
10.1007/JHEP04(2017)112
|
CoEPP-MN-16-30
|
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
In this work we perform an analysis of the recent AMS-02 antiproton flux and
the antiproton-to-proton ratio in the framework of simplified dark matter
models. To predict the AMS-02 observables we adopt the propagation and
injection parameters determined by the observed fluxes of nuclei. We assume
that the dark matter particle is a Dirac fermionic dark matter, with
leptophobic pseudoscalar or axialvector mediator that couples only to Standard
Model quarks and dark matter particles. We find that the AMS-02 observations
are consistent with the dark matter hypothesis within the uncertainties. The
antiproton data prefer a dark matter (mediator) mass in the 700 GeV--5 TeV
region for the annihilation with pseudoscalar mediator and greater than 700 GeV
(200 GeV--1 TeV) for the annihilation with axialvector mediator, respectively,
at about 68% confidence level. The AMS-02 data require an effective dark matter
annihilation cross section in the region of 1x10^{-25} -- 1x10^{-24}
(1x10^{-25} -- 4x10^{-24}) cm^3/s for the simplified model with pseudoscalar
(axialvector) mediator. The constraints from the LHC and Fermi-LAT are also
discussed.
|
[
{
"created": "Fri, 30 Dec 2016 14:56:51 GMT",
"version": "v1"
}
] |
2017-05-24
|
[
[
"Li",
"Tong",
""
]
] |
In this work we perform an analysis of the recent AMS-02 antiproton flux and the antiproton-to-proton ratio in the framework of simplified dark matter models. To predict the AMS-02 observables we adopt the propagation and injection parameters determined by the observed fluxes of nuclei. We assume that the dark matter particle is a Dirac fermionic dark matter, with leptophobic pseudoscalar or axialvector mediator that couples only to Standard Model quarks and dark matter particles. We find that the AMS-02 observations are consistent with the dark matter hypothesis within the uncertainties. The antiproton data prefer a dark matter (mediator) mass in the 700 GeV--5 TeV region for the annihilation with pseudoscalar mediator and greater than 700 GeV (200 GeV--1 TeV) for the annihilation with axialvector mediator, respectively, at about 68% confidence level. The AMS-02 data require an effective dark matter annihilation cross section in the region of 1x10^{-25} -- 1x10^{-24} (1x10^{-25} -- 4x10^{-24}) cm^3/s for the simplified model with pseudoscalar (axialvector) mediator. The constraints from the LHC and Fermi-LAT are also discussed.
|
hep-ph/0510350
|
Cosmin Macesanu
|
C. Macesanu, S. Nandi, C. M. Rujoiu
|
Monojet and Single Photon Signals from Universal Extra Dimensions
|
15 pages, 5 figures
|
Phys.Rev. D73 (2006) 076001
|
10.1103/PhysRevD.73.076001
| null |
hep-ph
| null |
The usual universal extra dimensions scenario does not allow for single
production of first level Kaluza-Klein (KK) excitations of matter due to the KK
number conservation. However, if the matter fields are localized on a fat brane
embedded in a higher dimensional space, matter-gravitation interactions violate
KK number, and the production of single KK excitations becomes possible. In
this paper we analyze the production of a single KK matter excitation together
with a graviton in the final state, and study the potential for discovery at
the Tevatron and Large Hadron Collider.
|
[
{
"created": "Wed, 26 Oct 2005 18:35:56 GMT",
"version": "v1"
}
] |
2009-11-11
|
[
[
"Macesanu",
"C.",
""
],
[
"Nandi",
"S.",
""
],
[
"Rujoiu",
"C. M.",
""
]
] |
The usual universal extra dimensions scenario does not allow for single production of first level Kaluza-Klein (KK) excitations of matter due to the KK number conservation. However, if the matter fields are localized on a fat brane embedded in a higher dimensional space, matter-gravitation interactions violate KK number, and the production of single KK excitations becomes possible. In this paper we analyze the production of a single KK matter excitation together with a graviton in the final state, and study the potential for discovery at the Tevatron and Large Hadron Collider.
|
0909.4300
|
Konstantin Matchev
|
Konstantin T. Matchev, Filip Moortgat, Luc Pape and Myeonghun Park
|
Precision sparticle spectroscopy in the inclusive same-sign dilepton
channel at LHC
|
4 pages, 4 figures, added results from PGS-level numerical
simulations, conclusions unchanged. Version to be published in Phys. Rev. D
|
Phys.Rev.D82:077701,2010
|
10.1103/PhysRevD.82.077701
| null |
hep-ph hep-ex
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
The inclusive same-sign dilepton channel is already recognized as a promising
discovery signature for supersymmetry in the early days of the LHC. We point
out that it can also be used for precision measurements of sparticle masses
after the initial discovery. As an illustration, we consider the LM6 CMS study
point in minimal supergravity, where the same-sign leptons most often result
from chargino decays to sneutrinos. We discuss three different techniques for
determining the chargino and sneutrino masses in an inclusive manner, i.e.
using only the two well measured lepton momenta, while treating all other
upstream objects in the event as a single entity of total transverse momentum
PT. This approach takes full advantage of the large production rates of colored
superpartners, but does not rely on the poorly measured hadronic jets, and
avoids any jet combinatorics problems. We discuss the anticipated precision of
our methods in the early LHC data.
|
[
{
"created": "Thu, 24 Sep 2009 12:37:52 GMT",
"version": "v1"
},
{
"created": "Wed, 22 Sep 2010 20:35:35 GMT",
"version": "v2"
}
] |
2014-11-20
|
[
[
"Matchev",
"Konstantin T.",
""
],
[
"Moortgat",
"Filip",
""
],
[
"Pape",
"Luc",
""
],
[
"Park",
"Myeonghun",
""
]
] |
The inclusive same-sign dilepton channel is already recognized as a promising discovery signature for supersymmetry in the early days of the LHC. We point out that it can also be used for precision measurements of sparticle masses after the initial discovery. As an illustration, we consider the LM6 CMS study point in minimal supergravity, where the same-sign leptons most often result from chargino decays to sneutrinos. We discuss three different techniques for determining the chargino and sneutrino masses in an inclusive manner, i.e. using only the two well measured lepton momenta, while treating all other upstream objects in the event as a single entity of total transverse momentum PT. This approach takes full advantage of the large production rates of colored superpartners, but does not rely on the poorly measured hadronic jets, and avoids any jet combinatorics problems. We discuss the anticipated precision of our methods in the early LHC data.
|
hep-ph/9503312
|
Ernest Ma
|
Ernest Ma and J. Pantaleone
|
Possible Revelation of Seesaw Mass Pattern in Solar and Atmospheric
Neutrino Data
|
10 pages (4 figures not included)
|
Phys.Rev.D52:3763-3767,1995
|
10.1103/PhysRevD.52.R3763
|
UCRHEP-T140 (March 1995)
|
hep-ph
| null |
Assuming the solar and atmospheric neutrino deficits to be due to neutrino
oscillations, it is shown that the 3X3 mass matrix spanning the e, mu, and tau
neutrinos may have already revealed a seesaw mass pattern. Also, this matrix is
the natural reduction of a simple 5X5 seesaw mass matrix with one large scale,
the 4X4 reduction of which predicts that a fourth neutrino would mix with the e
and mu neutrinos in such a way that oscillations between them may occur just
within the detection capability of the LSND (Liquid Scintillator Neutrino
Detector) experiment.
|
[
{
"created": "Mon, 13 Mar 1995 16:46:51 GMT",
"version": "v1"
}
] |
2016-09-01
|
[
[
"Ma",
"Ernest",
""
],
[
"Pantaleone",
"J.",
""
]
] |
Assuming the solar and atmospheric neutrino deficits to be due to neutrino oscillations, it is shown that the 3X3 mass matrix spanning the e, mu, and tau neutrinos may have already revealed a seesaw mass pattern. Also, this matrix is the natural reduction of a simple 5X5 seesaw mass matrix with one large scale, the 4X4 reduction of which predicts that a fourth neutrino would mix with the e and mu neutrinos in such a way that oscillations between them may occur just within the detection capability of the LSND (Liquid Scintillator Neutrino Detector) experiment.
|
hep-ph/9711473
|
Sreerup Raychaudhuri
|
Dilip Kumar Ghosh (Mumbai Univ.), Sreerup Raychaudhuri (CERN)
|
R-parity Violation in Neutralino Decays at an e \gamma Collider
|
LaTeX, 17 pages, 4 figures
|
Phys.Lett. B422 (1998) 187-195
|
10.1016/S0370-2693(98)00045-8
|
CERN-TH/97-341
|
hep-ph
| null |
At an e-\gamma collider, a selectron \tilde{e}_{L,R} may be produced in
association with a (lightest) neutralino \tilde{\chi}_1. Decay of the selectron
may be expected to yield a final state with an electron and another
\tilde{\chi}_1. If R-parity is violated, these two neutralinos will decay,
giving rise to distinctive signatures, which are identified and studied.
|
[
{
"created": "Tue, 25 Nov 1997 22:19:34 GMT",
"version": "v1"
}
] |
2009-10-30
|
[
[
"Ghosh",
"Dilip Kumar",
"",
"Mumbai Univ."
],
[
"Raychaudhuri",
"Sreerup",
"",
"CERN"
]
] |
At an e-\gamma collider, a selectron \tilde{e}_{L,R} may be produced in association with a (lightest) neutralino \tilde{\chi}_1. Decay of the selectron may be expected to yield a final state with an electron and another \tilde{\chi}_1. If R-parity is violated, these two neutralinos will decay, giving rise to distinctive signatures, which are identified and studied.
|
2101.10634
|
Akira Okawa
|
Nobuhito Maru and Akira Okawa
|
Non-Gaussianity from $X, Y$ gauge bosons in Cosmological Collider
Physics
|
30 pages, 4 figures
| null | null |
OCU-PHYS 528, NITEP 86
|
hep-ph astro-ph.CO gr-qc hep-th
|
http://creativecommons.org/licenses/by/4.0/
|
Heavy fields of Hubble scale order present during inflation contribute to the
non-Gaussian signature for the three-point function of the inflaton. Taking
into account that Hubble scale is around the scale of grand unified theory
(GUT), this opens a possibility that the GUT scale signatures, which are very
hard to be discovered at collider, might be detectable by using information
from the precise observations of cosmic microwave background. We discuss a
detactability of the $X, Y$ gauge boson present in any GUT in a framework of
cosmological collider physics. Calculating one-loop contributions of $X, Y$
gauge bosons to the inflaton three-point functions, we find a remarkable result
that one-loop diagram with interactions originated from the mass terms of $X,
Y$ gauge bosons provides an enhancement factor expressed by the ratio between
the $X, Y$ gauge boson mass and Hubble scale as $(m_X/H)^4$. In an estimation
of the non-Gaussianity, this factor is crucial and its impact on the
detactability of $X, Y$ gauge bosons is discussed.
|
[
{
"created": "Tue, 26 Jan 2021 08:49:25 GMT",
"version": "v1"
}
] |
2021-01-27
|
[
[
"Maru",
"Nobuhito",
""
],
[
"Okawa",
"Akira",
""
]
] |
Heavy fields of Hubble scale order present during inflation contribute to the non-Gaussian signature for the three-point function of the inflaton. Taking into account that Hubble scale is around the scale of grand unified theory (GUT), this opens a possibility that the GUT scale signatures, which are very hard to be discovered at collider, might be detectable by using information from the precise observations of cosmic microwave background. We discuss a detactability of the $X, Y$ gauge boson present in any GUT in a framework of cosmological collider physics. Calculating one-loop contributions of $X, Y$ gauge bosons to the inflaton three-point functions, we find a remarkable result that one-loop diagram with interactions originated from the mass terms of $X, Y$ gauge bosons provides an enhancement factor expressed by the ratio between the $X, Y$ gauge boson mass and Hubble scale as $(m_X/H)^4$. In an estimation of the non-Gaussianity, this factor is crucial and its impact on the detactability of $X, Y$ gauge bosons is discussed.
|
1007.2368
|
Rong Li
|
Rong Li, Jian-Xiong Wang
|
The next-to-leading-order QCD correction to inclusive J/\psi(\Upsilon)
production in Z^0 decay
|
8 pages, 8 figures
|
Phys.Rev.D82:054006,2010
|
10.1103/PhysRevD.82.054006
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
In this paper, we study the $J/\psi(\Upsilon)$ production in Z boson decay in
color-singlet model(CSM). We calculate the next-to-leading-order (NLO) QCD
correction to $Z \to Quarkonium+Q\bar{Q}$, the dominant contribution in the
CSM, with the vector and axial-vector parts in $ZQ\bar{Q}$ vertex being treated
separately. The results show that the vector and axial-vector parts have the
same K factor (the ratio of NLO result to leading-order result) 1.13 with the
renormalization scale $\mu$=2$m_c$ and $m_c=1.5GeV$, and the K factor falls to
0.918 when applying the Brodsky, Lepage, and Mackenzie(BLM) renormalization
scale scheme with obtained $\mu_{BLM}=2.28GeV$ and $m_c=1.5$GeV. By including
the contributions from the next-dominant ones, the photon and gluon
fragmentation processes, the branching ratio for $Z \to J/\psi_{prompt}+X$ is
$(7.3 \sim 10.0)\times 10^{-5}$ with the uncertainty consideration for the
renormalization scale and Charm quark mass. The results are about half of the
central value of the experimental measurement 2.1$\times10^{-4}$. Furthermore,
the $J/\psi$ energy distribution in our calculation is not well consistent with
the experimental data. Therefore, even at QCD NLO, the contribution to $Z \to
J/\psi_{prompt}+X$ from the CSM can not fully account for the experimental
measurement. And there should be contributions from other mechanisms, such as
the color-octet(COM) contributions. We define $R_{c\bar{c}}=\frac{\Gamma(Z \to
J/\psi c\bar{c}X)}{\Gamma(Z \to J/\psi X)}$ and obtain $R_{cc}=0.84$ for only
CSM contribution and $R_{cc}=0.49$ for COM and CSM contributions together. Then
$R_{cc}$ measurement could be used to clarify the COM contributions.
|
[
{
"created": "Wed, 14 Jul 2010 16:16:18 GMT",
"version": "v1"
}
] |
2014-11-21
|
[
[
"Li",
"Rong",
""
],
[
"Wang",
"Jian-Xiong",
""
]
] |
In this paper, we study the $J/\psi(\Upsilon)$ production in Z boson decay in color-singlet model(CSM). We calculate the next-to-leading-order (NLO) QCD correction to $Z \to Quarkonium+Q\bar{Q}$, the dominant contribution in the CSM, with the vector and axial-vector parts in $ZQ\bar{Q}$ vertex being treated separately. The results show that the vector and axial-vector parts have the same K factor (the ratio of NLO result to leading-order result) 1.13 with the renormalization scale $\mu$=2$m_c$ and $m_c=1.5GeV$, and the K factor falls to 0.918 when applying the Brodsky, Lepage, and Mackenzie(BLM) renormalization scale scheme with obtained $\mu_{BLM}=2.28GeV$ and $m_c=1.5$GeV. By including the contributions from the next-dominant ones, the photon and gluon fragmentation processes, the branching ratio for $Z \to J/\psi_{prompt}+X$ is $(7.3 \sim 10.0)\times 10^{-5}$ with the uncertainty consideration for the renormalization scale and Charm quark mass. The results are about half of the central value of the experimental measurement 2.1$\times10^{-4}$. Furthermore, the $J/\psi$ energy distribution in our calculation is not well consistent with the experimental data. Therefore, even at QCD NLO, the contribution to $Z \to J/\psi_{prompt}+X$ from the CSM can not fully account for the experimental measurement. And there should be contributions from other mechanisms, such as the color-octet(COM) contributions. We define $R_{c\bar{c}}=\frac{\Gamma(Z \to J/\psi c\bar{c}X)}{\Gamma(Z \to J/\psi X)}$ and obtain $R_{cc}=0.84$ for only CSM contribution and $R_{cc}=0.49$ for COM and CSM contributions together. Then $R_{cc}$ measurement could be used to clarify the COM contributions.
|
1907.13555
|
Xin-Qiang Li
|
Shao-Ping Li and Xin-Qiang Li
|
Probing New Physics Signals with Symmetry-Restored Yukawa Textures
|
9 pages, 3 figures; formulation of the model refined, and several
references added, final version published in the journal
| null |
10.1140/epjc/s10052-020-7839-4
| null |
hep-ph hep-ex
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We implement a symmetry violation guideline into a two-Higgs-doublet model
embedded with three right-handed neutrinos, and exploit the generic Yukawa
structures of the model via a hypothetical symmetry restoration of a global
$U_Q(1)^3\times U_L(1)^3$ symmetry. We then apply a mass-powered
parametrization to construct the phenomenologically motivated Yukawa
interactions, which enables us to incorporate correlatively the neutrino mass,
dark matter, as well as the lepton-flavor universality violations in
$R_{K^{(*)}}$ and $R_{D^{(*)}}$. Specifically, two atmospheric-scale neutrino
masses are generated by a low-scale seesaw mechanism, while the much lighter
one, being of $\mathcal{O}(10^{-6})~{\rm eV}$, is fixed by a $7.1~{\rm keV}$
sterile neutrino dark matter produced primordially by the freeze-in mechanism.
On the other hand, the neutrino and the charged-lepton mass hierarchies encoded
in the mass-powered textures can naturally account for the $R_{K^{(*)}}$ and
the $R_{D^{(*)}}$ anomalies, respectively. As a further application, a milder
discrepancy of the muon $g-2$ is observed, which has also been implied by the
recently refined lattice results.
|
[
{
"created": "Wed, 31 Jul 2019 15:31:11 GMT",
"version": "v1"
},
{
"created": "Sat, 21 Mar 2020 09:01:17 GMT",
"version": "v2"
}
] |
2020-04-22
|
[
[
"Li",
"Shao-Ping",
""
],
[
"Li",
"Xin-Qiang",
""
]
] |
We implement a symmetry violation guideline into a two-Higgs-doublet model embedded with three right-handed neutrinos, and exploit the generic Yukawa structures of the model via a hypothetical symmetry restoration of a global $U_Q(1)^3\times U_L(1)^3$ symmetry. We then apply a mass-powered parametrization to construct the phenomenologically motivated Yukawa interactions, which enables us to incorporate correlatively the neutrino mass, dark matter, as well as the lepton-flavor universality violations in $R_{K^{(*)}}$ and $R_{D^{(*)}}$. Specifically, two atmospheric-scale neutrino masses are generated by a low-scale seesaw mechanism, while the much lighter one, being of $\mathcal{O}(10^{-6})~{\rm eV}$, is fixed by a $7.1~{\rm keV}$ sterile neutrino dark matter produced primordially by the freeze-in mechanism. On the other hand, the neutrino and the charged-lepton mass hierarchies encoded in the mass-powered textures can naturally account for the $R_{K^{(*)}}$ and the $R_{D^{(*)}}$ anomalies, respectively. As a further application, a milder discrepancy of the muon $g-2$ is observed, which has also been implied by the recently refined lattice results.
|
1604.06185
|
Xavier Calmet
|
Xavier Calmet
|
The Dual Standard Model and the 750 GeV Events at the LHC
| null | null |
10.1209/0295-5075/115/21001
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
The aim of this short paper is to discuss the recently observed excess at 750
GeV by both CMS and ATLAS in the light of the dual standard model. Within this
framework it is natural to introduce neutral spin 0 and/or spin 2 $SU(2)$ glue
mesons which could easily account for this observation if it is confirmed. The
model predicts that these glue mesons would be part of $SU(2)$ triplets and
that there must thus be charged counterparts of these glue mesons carrying a
QED charge of $\pm 1$ with a spin 0 and/or 2 as well.
|
[
{
"created": "Thu, 21 Apr 2016 05:39:51 GMT",
"version": "v1"
}
] |
2016-09-21
|
[
[
"Calmet",
"Xavier",
""
]
] |
The aim of this short paper is to discuss the recently observed excess at 750 GeV by both CMS and ATLAS in the light of the dual standard model. Within this framework it is natural to introduce neutral spin 0 and/or spin 2 $SU(2)$ glue mesons which could easily account for this observation if it is confirmed. The model predicts that these glue mesons would be part of $SU(2)$ triplets and that there must thus be charged counterparts of these glue mesons carrying a QED charge of $\pm 1$ with a spin 0 and/or 2 as well.
|
0810.2959
|
Hilmar Forkel
|
Hilmar Forkel and Eberhard Klempt
|
Diquark correlations in baryon spectroscopy and holographic QCD
|
4 pages
|
Phys.Lett.B679:77-80,2009
|
10.1016/j.physletb.2009.07.008
| null |
hep-ph hep-lat nucl-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We introduce an improved mass formula for the nucleon and delta resonances
and show how it emerges from AdS/QCD in a straightforward extension of the
'metric soft wall' gravity dual. The resulting spectrum depends on just one
adjustable parameter, characterizing confinement-induced IR deformations of the
anti-de Sitter (AdS) metric, and on the fraction of 'good' (i.e. maximally
attractive) diquarks in the baryon's quark model wave function. Despite its
simplicity, the predicted spectrum describes the masses of all 48 observed
light-quark baryon states and their linear trajectory structure with
unprecedented accuracy.
|
[
{
"created": "Thu, 16 Oct 2008 16:24:31 GMT",
"version": "v1"
}
] |
2014-11-18
|
[
[
"Forkel",
"Hilmar",
""
],
[
"Klempt",
"Eberhard",
""
]
] |
We introduce an improved mass formula for the nucleon and delta resonances and show how it emerges from AdS/QCD in a straightforward extension of the 'metric soft wall' gravity dual. The resulting spectrum depends on just one adjustable parameter, characterizing confinement-induced IR deformations of the anti-de Sitter (AdS) metric, and on the fraction of 'good' (i.e. maximally attractive) diquarks in the baryon's quark model wave function. Despite its simplicity, the predicted spectrum describes the masses of all 48 observed light-quark baryon states and their linear trajectory structure with unprecedented accuracy.
|
1507.00661
|
Bennie F. L. Ward
|
B.F.L. Ward (1) ((1) Baylor University, Waco, TX, USA)
|
Einstein-Heisenberg Consistency Condition Interplay with Cosmological
Constant Prediction in Resummed Quantum Gravity
|
7 pages, no figures
|
Mod. Phys. Lett. A 30 (2015) 1550206
|
10.1142/S0217732315502065
|
BU-HEPP-15-02
|
hep-ph gr-qc
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We argue that our recent success in using our resummed quantum gravity
approach to Einstein's general theory of relativity, in the context of the
Planck scale cosmology formulation of Bonanno and Reuter, to estimate the value
of the cosmological constant \Lambda supports the use of quantum mechanical
consistency requirements to constrain the main uncertainty in that very
promising result. This main uncertainty, which is due to the uncertainty in the
value of the time t_{\text{tr}} at which the transition from the Planck scale
cosmology to the FRW model occurs, is shown to be reduced, by requiring
consistency between the Heisenberg uncertainty principle and the known
properties of the solutions of Einstein's equations, from four orders of
magnitude to the level of a factor of {\cal O}(10). This lends more credibility
to the over-all resummed quantum gravity approach itself, in general, and to
our estimate of $\Lambda$ in particular.
|
[
{
"created": "Thu, 2 Jul 2015 17:06:07 GMT",
"version": "v1"
}
] |
2015-10-28
|
[
[
"Ward",
"B. F. L.",
"",
"Baylor University, Waco, TX, USA"
]
] |
We argue that our recent success in using our resummed quantum gravity approach to Einstein's general theory of relativity, in the context of the Planck scale cosmology formulation of Bonanno and Reuter, to estimate the value of the cosmological constant \Lambda supports the use of quantum mechanical consistency requirements to constrain the main uncertainty in that very promising result. This main uncertainty, which is due to the uncertainty in the value of the time t_{\text{tr}} at which the transition from the Planck scale cosmology to the FRW model occurs, is shown to be reduced, by requiring consistency between the Heisenberg uncertainty principle and the known properties of the solutions of Einstein's equations, from four orders of magnitude to the level of a factor of {\cal O}(10). This lends more credibility to the over-all resummed quantum gravity approach itself, in general, and to our estimate of $\Lambda$ in particular.
|
hep-ph/0103294
|
Jae Sik Lee
|
S.Y. Choi, Kaoru Hagiwara and Jae Sik Lee
|
Higgs Boson Decays in the Minimal Supersymmetric Standard Model with
Radiative Higgs Sector CP Violation
|
17 pages, 5 eps figures. Comments on the color and electric-charge
breaking minima and references added. To appear in the Phys. Rev. D
|
Phys.Rev.D64:032004,2001
|
10.1103/PhysRevD.64.032004
|
KEK-TH-754
|
hep-ph
| null |
We re-evaluate the decays of the Higgs bosons in the minimal supersymmetric
standard model (MSSM) where the tree-level CP invariance of the Higgs potential
is explicitly broken by the loop effects of the third-generation squarks with
CP-violating soft-breaking Yukawa interactions. This study is based on the mass
matrix of the neutral Higgs bosons that is valid for arbitrary values of all
the relevant MSSM parameters. It extends the previous work considerably by
including neutral Higgs-boson decays into virtual gauge bosons and those into
top-squark pairs, by implementing squark-loop contributions to the two-gluon
decay channel, and by incorporating the decays of the charged Higgs boson. The
constraints from the electron electric dipole moment on the CP phases are also
discussed. We find that the branching fractions of both the neutral and charged
Higgs-boson decays and their total decay widths depend strongly on the CP
phases of the top (and bottom) squark sectors through the loop-induced neutral
Higgs boson mixing as well as the direct couplings of the neutral Higgs bosons
to top squark pairs.
|
[
{
"created": "Wed, 28 Mar 2001 09:45:14 GMT",
"version": "v1"
},
{
"created": "Thu, 17 May 2001 02:11:48 GMT",
"version": "v2"
}
] |
2010-05-28
|
[
[
"Choi",
"S. Y.",
""
],
[
"Hagiwara",
"Kaoru",
""
],
[
"Lee",
"Jae Sik",
""
]
] |
We re-evaluate the decays of the Higgs bosons in the minimal supersymmetric standard model (MSSM) where the tree-level CP invariance of the Higgs potential is explicitly broken by the loop effects of the third-generation squarks with CP-violating soft-breaking Yukawa interactions. This study is based on the mass matrix of the neutral Higgs bosons that is valid for arbitrary values of all the relevant MSSM parameters. It extends the previous work considerably by including neutral Higgs-boson decays into virtual gauge bosons and those into top-squark pairs, by implementing squark-loop contributions to the two-gluon decay channel, and by incorporating the decays of the charged Higgs boson. The constraints from the electron electric dipole moment on the CP phases are also discussed. We find that the branching fractions of both the neutral and charged Higgs-boson decays and their total decay widths depend strongly on the CP phases of the top (and bottom) squark sectors through the loop-induced neutral Higgs boson mixing as well as the direct couplings of the neutral Higgs bosons to top squark pairs.
|
hep-ph/9601366
|
Tomoko Uesugi
|
Tomoko Uesugi
|
Electroweak baryogenesis with the vector-like quark model
|
Latex file, 3pp
| null | null |
OCHA-PP-73
|
hep-ph
| null |
We study on the electroweak baryogenesis problem in the vector-like quark
model. This model can add to the minimal standard model the extra CP-violation
source which breaks CP spontaneously. Using charge transport mechanism
suggested by Nelson et al, we can get the net hypercharge flux : $f_{Y} \sim
10^{-5}$. This result could nicely explain the present baryon to entropy ratio
: $\rho_{B}/s \sim 10^{-9}$.
|
[
{
"created": "Tue, 30 Jan 1996 04:03:50 GMT",
"version": "v1"
}
] |
2007-05-23
|
[
[
"Uesugi",
"Tomoko",
""
]
] |
We study on the electroweak baryogenesis problem in the vector-like quark model. This model can add to the minimal standard model the extra CP-violation source which breaks CP spontaneously. Using charge transport mechanism suggested by Nelson et al, we can get the net hypercharge flux : $f_{Y} \sim 10^{-5}$. This result could nicely explain the present baryon to entropy ratio : $\rho_{B}/s \sim 10^{-9}$.
|
hep-ph/9807446
|
Denner Ansgar
|
Ansgar Denner and Stefano Pozzorini
|
Electroweak radiative corrections to polarized Moeller scattering at
high energies
|
18 pages, LaTeX, 15 eps figures
|
Eur.Phys.J.C7:185-195,1999
|
10.1007/s100529800995
|
PSI-PR-98-16
|
hep-ph
| null |
The cross section for $e^-e^- \to e^-e^-$ with arbitrary electron
polarizations is calculated within the Electroweak Standard Model for energies
large compared to the electron mass, including the complete virtual and
soft-photonic $O(\alpha)$ radiative corrections. The relevant analytical
results are listed, and a numerical evaluation is presented for the unpolarized
and polarized cross sections as well as for polarization asymmetries. The
relative weak corrections are typically of the order of 10%. At low energies,
the bulk of the corrections is due to the running of the electromagnetic
coupling constant. For left-handed electrons, at high energies the vertex and
box corrections involving virtual W bosons become very important. The
polarization asymmetry is considerably reduced by the weak radiative
corrections.
|
[
{
"created": "Tue, 21 Jul 1998 14:58:33 GMT",
"version": "v1"
}
] |
2008-11-26
|
[
[
"Denner",
"Ansgar",
""
],
[
"Pozzorini",
"Stefano",
""
]
] |
The cross section for $e^-e^- \to e^-e^-$ with arbitrary electron polarizations is calculated within the Electroweak Standard Model for energies large compared to the electron mass, including the complete virtual and soft-photonic $O(\alpha)$ radiative corrections. The relevant analytical results are listed, and a numerical evaluation is presented for the unpolarized and polarized cross sections as well as for polarization asymmetries. The relative weak corrections are typically of the order of 10%. At low energies, the bulk of the corrections is due to the running of the electromagnetic coupling constant. For left-handed electrons, at high energies the vertex and box corrections involving virtual W bosons become very important. The polarization asymmetry is considerably reduced by the weak radiative corrections.
|
1501.06569
|
Matthias K\"onig
|
Yuval Grossman (Cornell U.), Matthias K\"onig and Matthias Neubert
(JGU Mainz)
|
Exclusive Radiative Decays of W and Z Bosons in QCD Factorization
|
37 pages (+ appendices and references), 9 figures and 9 tables. v2:
Comparison with recent ATLAS data added, minor revisions + some references
added. v3: decay constant of the phi and omega mesons updated and few typos
fixed; version published in JHEP
|
JHEP 1504 (2015) 101
|
10.1007/JHEP04(2015)101
|
MITP/15-002
|
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We present a detailed theoretical analysis of very rare, exclusive hadronic
decays of the electroweak gauge bosons V=W, Z from first principles of QCD. Our
main focus is on the radiative decays V->M+gamma, in which M is a pseudoscalar
or vector meson. At leading order in an expansion in powers of Lambda_{QCD}/m_V
the decay amplitudes can be factorized into convolutions of calculable
hard-scattering coefficients with the leading-twist light-cone distribution
amplitude of the meson M. Power corrections to the decay rates arise first at
order (Lambda_{QCD}/m_V)^2. They can be estimated in terms of higher-twist
distribution amplitudes and are predicted to be tiny. We include one-loop
O(alpha_s) radiative corrections to the hard-scattering coefficients and
perform the resummation of large logarithms [alpha_s log(m_V^2/mu_0^2)]^n (with
mu_0=1 GeV a typical hadronic scale) to all orders in perturbation theory.
Evolution effects have an important impact both numerically and conceptually,
since they reduce the sensitivity to poorly determined hadronic parameters. We
present detailed numerical predictions and error estimates, which can serve as
benchmarks for future precision measurements. We also present an exploratory
study of the weak radiative decays Z->M+W. Some of the decay modes studied here
have branching ratios large enough to be accessible in the high-luminosity run
of the LHC. Many of them can be measured with high accuracy at a future lepton
collider. This will provide stringent tests of the QCD factorization formalism
and enable novel searches for new physics.
|
[
{
"created": "Mon, 26 Jan 2015 21:00:08 GMT",
"version": "v1"
},
{
"created": "Mon, 9 Feb 2015 13:07:48 GMT",
"version": "v2"
},
{
"created": "Fri, 15 May 2015 14:23:31 GMT",
"version": "v3"
}
] |
2015-05-18
|
[
[
"Grossman",
"Yuval",
"",
"Cornell U."
],
[
"König",
"Matthias",
"",
"JGU Mainz"
],
[
"Neubert",
"Matthias",
"",
"JGU Mainz"
]
] |
We present a detailed theoretical analysis of very rare, exclusive hadronic decays of the electroweak gauge bosons V=W, Z from first principles of QCD. Our main focus is on the radiative decays V->M+gamma, in which M is a pseudoscalar or vector meson. At leading order in an expansion in powers of Lambda_{QCD}/m_V the decay amplitudes can be factorized into convolutions of calculable hard-scattering coefficients with the leading-twist light-cone distribution amplitude of the meson M. Power corrections to the decay rates arise first at order (Lambda_{QCD}/m_V)^2. They can be estimated in terms of higher-twist distribution amplitudes and are predicted to be tiny. We include one-loop O(alpha_s) radiative corrections to the hard-scattering coefficients and perform the resummation of large logarithms [alpha_s log(m_V^2/mu_0^2)]^n (with mu_0=1 GeV a typical hadronic scale) to all orders in perturbation theory. Evolution effects have an important impact both numerically and conceptually, since they reduce the sensitivity to poorly determined hadronic parameters. We present detailed numerical predictions and error estimates, which can serve as benchmarks for future precision measurements. We also present an exploratory study of the weak radiative decays Z->M+W. Some of the decay modes studied here have branching ratios large enough to be accessible in the high-luminosity run of the LHC. Many of them can be measured with high accuracy at a future lepton collider. This will provide stringent tests of the QCD factorization formalism and enable novel searches for new physics.
|
1109.5185
|
Francesco Becattini
|
L. Ferroni (University of Frankfurt), F. Becattini (University of
Florence)
|
Statistical hadronization with exclusive channels in e+e- annihilation
|
27 pages, 12 figures
| null |
10.1140/epjc/s10052-011-1824-x
| null |
hep-ph nucl-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We perform a systematic analysis of exclusive hadronic channels in e+e-
collisions at centre-of-mass energies between 2.1 and 2.6 GeV within the
statistical hadronization model. Because of the low multiplicities involved,
calculations have been carried out in the full microcanonical ensemble,
including conservation of energy-momentum, angular momentum, parity, isospin,
and all relevant charges. We show that the data is in an overall good agreement
with the model for an energy density of about 0.5 GeV/fm^3 and an extra
strangeness suppression parameter gamma_S ~ 0.7, essentially the same values
found with fits to inclusive multiplicities at higher energy.
|
[
{
"created": "Fri, 23 Sep 2011 20:01:52 GMT",
"version": "v1"
}
] |
2015-05-30
|
[
[
"Ferroni",
"L.",
"",
"University of Frankfurt"
],
[
"Becattini",
"F.",
"",
"University of\n Florence"
]
] |
We perform a systematic analysis of exclusive hadronic channels in e+e- collisions at centre-of-mass energies between 2.1 and 2.6 GeV within the statistical hadronization model. Because of the low multiplicities involved, calculations have been carried out in the full microcanonical ensemble, including conservation of energy-momentum, angular momentum, parity, isospin, and all relevant charges. We show that the data is in an overall good agreement with the model for an energy density of about 0.5 GeV/fm^3 and an extra strangeness suppression parameter gamma_S ~ 0.7, essentially the same values found with fits to inclusive multiplicities at higher energy.
|
1203.4489
|
Zack Sullivan
|
Daniel Duffty, Zack Sullivan, Hao Zhang
|
Top quark forward-backward asymmetry and W^prime bosons
|
6 pgs., 4 PS figures
| null |
10.1103/PhysRevD.85.094027
|
IIT-CAPP-12-02; ANL-HEP-PR-12-15
|
hep-ph hep-ex
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
The top quark forward-backward asymmetry measured at the Fermilab Tevatron
collider deviates from the standard model prediction. A W^prime boson model is
described, where the coupling W^prime-t-d is fixed by the tt_bar
forward-backward asymmetry and total cross section at the Tevatron. We show
that such a W^prime boson would be produced in association with a top quark at
the CERN Large Hadron Collider (LHC), thus inducing additional tt_bar+j events.
We use measurements of tt_bar+n-jet production from the LHC to constrain the
allowed W^prime-t-d couplings as a function of W^prime boson mass. We find that
this W^prime model is constrained at the 95% C.L. using 0.7 fb^{-1} of data
from the LHC, and could be fully excluded with 5 fb^{-1} of data.
|
[
{
"created": "Tue, 20 Mar 2012 16:17:48 GMT",
"version": "v1"
}
] |
2015-06-04
|
[
[
"Duffty",
"Daniel",
""
],
[
"Sullivan",
"Zack",
""
],
[
"Zhang",
"Hao",
""
]
] |
The top quark forward-backward asymmetry measured at the Fermilab Tevatron collider deviates from the standard model prediction. A W^prime boson model is described, where the coupling W^prime-t-d is fixed by the tt_bar forward-backward asymmetry and total cross section at the Tevatron. We show that such a W^prime boson would be produced in association with a top quark at the CERN Large Hadron Collider (LHC), thus inducing additional tt_bar+j events. We use measurements of tt_bar+n-jet production from the LHC to constrain the allowed W^prime-t-d couplings as a function of W^prime boson mass. We find that this W^prime model is constrained at the 95% C.L. using 0.7 fb^{-1} of data from the LHC, and could be fully excluded with 5 fb^{-1} of data.
|
hep-ph/0308051
|
Rabindra N. Mohapatra
|
R. N. Mohapatra, S. Nussinov and A. Perez-Lorenzana
|
Large Extra Dimensions and Decaying KK Recurrences
|
16 pages, latex
|
Phys.Rev.D68:116001,2003
|
10.1103/PhysRevD.68.116001
|
UMD-PP-03-065
|
hep-ph hep-th
| null |
We suggest the possibility that in ADD type brane-world scenarios, the higher
KK excitations of the graviton may decay to lower ones owing to a breakdown of
the conservation of extra dimensional ``momenta'' and study its implications
for astrophysics and cosmology. We give an explicit realization of this idea
with a bulk scalar field $\Phi$, whose nonzero KK modes acquire vacuum
expectation values. This scenario helps to avoid constraints on large extra
dimensions that come from gamma ray flux bounds in the direction of nearby
supernovae as well as those coming from diffuse cosmological gamma ray
background. It also relaxes the very stringent limits on reheat temperature of
the universe in ADD models.
|
[
{
"created": "Tue, 5 Aug 2003 14:18:55 GMT",
"version": "v1"
}
] |
2008-11-26
|
[
[
"Mohapatra",
"R. N.",
""
],
[
"Nussinov",
"S.",
""
],
[
"Perez-Lorenzana",
"A.",
""
]
] |
We suggest the possibility that in ADD type brane-world scenarios, the higher KK excitations of the graviton may decay to lower ones owing to a breakdown of the conservation of extra dimensional ``momenta'' and study its implications for astrophysics and cosmology. We give an explicit realization of this idea with a bulk scalar field $\Phi$, whose nonzero KK modes acquire vacuum expectation values. This scenario helps to avoid constraints on large extra dimensions that come from gamma ray flux bounds in the direction of nearby supernovae as well as those coming from diffuse cosmological gamma ray background. It also relaxes the very stringent limits on reheat temperature of the universe in ADD models.
|
hep-ph/0110139
|
Stefan Sint
|
Juri Rolf, Stefan Sint
|
The charm quark's mass in quenched QCD
|
Lattice2001(spectrum), 3 pages
|
Nucl.Phys.Proc.Suppl. 106 (2002) 239-241
|
10.1016/S0920-5632(01)01675-9
|
CERN-TH/2001-269, HU-EP-01/37
|
hep-ph
| null |
We present our preliminary result for the charmed quark mass, which follows
from taking the D_s and K meson masses from experiment and r0=0.5 fm (or,
equivalently F_K=160 MeV) to set the scale. For the renormalization group
invariant quark mass we obtain M_c = 1684(64) MeV, which translates to
m_c(m_c)= 1314 (40)(20)(7) MeV for the running mass in the MSbar scheme.
Renormalization is treated non-perturbatively, and the continuum limit has been
taken, so that the only uncontrolled systematic error consists in the use of
the quenched approximation.
|
[
{
"created": "Wed, 10 Oct 2001 14:17:10 GMT",
"version": "v1"
}
] |
2015-06-25
|
[
[
"Rolf",
"Juri",
""
],
[
"Sint",
"Stefan",
""
]
] |
We present our preliminary result for the charmed quark mass, which follows from taking the D_s and K meson masses from experiment and r0=0.5 fm (or, equivalently F_K=160 MeV) to set the scale. For the renormalization group invariant quark mass we obtain M_c = 1684(64) MeV, which translates to m_c(m_c)= 1314 (40)(20)(7) MeV for the running mass in the MSbar scheme. Renormalization is treated non-perturbatively, and the continuum limit has been taken, so that the only uncontrolled systematic error consists in the use of the quenched approximation.
|
hep-ph/9911296
|
Mark Alexander Jack
|
M. Jack (DESY Zeuthen, Germany)
|
QED radiative corrections to e+e- --> f+f- with realistic cuts at LEP
energies and beyond
|
7 pages (Latex), 6 figures (Postscript), 2 tables, uses
sprocl_mod.sty
| null | null |
DESY 99-166
|
hep-ph
| null |
After 10 years of steadily increasing the experimental precision at LEP/SLC,
there is a strong demand on an update of existing programs for fermion pair
production. We present a rederivation of the O(alpha) Bremsstrahlung
corrections to e+e- --> f+f- for the semi-analytic program ZFITTER. We focus on
observables like total cross section and forward-backward asymmetry in the
leptonic case with combined cuts on acollinearity angle, acceptance angle, and
minimal energy of the fermions. The outcome of our analysis is a shift of the
predictions by ZFITTER at LEP 1 energies off-resonance of a few per mil while
at the Z resonance numerical changes can be neglected. Thus we obtain for cross
sections and asymmetries at LEP 1 a level of agreement with other programs of
better than per mil, like for the kinematically simpler s' cut option. A
preliminary analysis of ZFITTER, TOPAZ0, and other codes at LEP 2 energies
showing deviations of several per cent with acollinearity cuts enforce a future
examination of higher order effects with different cuts. The predictions by
LEP/SLC data, however, are not affected within the experimental errors.
|
[
{
"created": "Wed, 10 Nov 1999 10:14:06 GMT",
"version": "v1"
}
] |
2007-05-23
|
[
[
"Jack",
"M.",
"",
"DESY Zeuthen, Germany"
]
] |
After 10 years of steadily increasing the experimental precision at LEP/SLC, there is a strong demand on an update of existing programs for fermion pair production. We present a rederivation of the O(alpha) Bremsstrahlung corrections to e+e- --> f+f- for the semi-analytic program ZFITTER. We focus on observables like total cross section and forward-backward asymmetry in the leptonic case with combined cuts on acollinearity angle, acceptance angle, and minimal energy of the fermions. The outcome of our analysis is a shift of the predictions by ZFITTER at LEP 1 energies off-resonance of a few per mil while at the Z resonance numerical changes can be neglected. Thus we obtain for cross sections and asymmetries at LEP 1 a level of agreement with other programs of better than per mil, like for the kinematically simpler s' cut option. A preliminary analysis of ZFITTER, TOPAZ0, and other codes at LEP 2 energies showing deviations of several per cent with acollinearity cuts enforce a future examination of higher order effects with different cuts. The predictions by LEP/SLC data, however, are not affected within the experimental errors.
|
1404.3013
|
Hirohisa Kubota
|
Hirohisa Kubota, Mihoko Nojiri
|
Prospect for Study of Randall-Sundrum model from Higgs decay at future
colliders
|
25 pages, 23 figures
|
Phys. Rev. D 90, 035006 (2014)
|
10.1103/PhysRevD.90.035006
|
KEK-TH-1722
|
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
In a class of Randall-Sundrum(RS) models, matter fermions and gauge bosons
live in a five dimensional bulk, while the Higgs boson lives in a four
dimensional visible brane. The Higgs boson can mix with a radion, by a
Higgs-radion mixing term. It is difficult to directly discover the heavy
Kaluza-Klein(KK) particles at the Large Hadron Collider(LHC), because the mass
of the lightest KK particle is expected to be above 10 TeV to satisfy
constraints from avor changing neutral currents(FCNC). Instead, the precision
measurements of the Higgs sector at the high luminosity LHC(HL-LHC) and the
International Linear Collider(ILC) is a promising way to observe the deviation
originating from the Higgs-radion mixing and radiative corrections from the KK
gauge bosons and matter fermions. For some cases, those effects are separately
determined, providing valuable information on the model. We perform an
extensive scan of the model parameters to see the expected deviations of the
Higgs couplings. We also choose several reference points consistent with the
current data to show the precision of the fundamental parameter measurements at
the future colliders. We also study the radion-Z-Z coupling in the model and
discuss the role of the ILC for radion search.
|
[
{
"created": "Fri, 11 Apr 2014 06:32:55 GMT",
"version": "v1"
}
] |
2016-11-02
|
[
[
"Kubota",
"Hirohisa",
""
],
[
"Nojiri",
"Mihoko",
""
]
] |
In a class of Randall-Sundrum(RS) models, matter fermions and gauge bosons live in a five dimensional bulk, while the Higgs boson lives in a four dimensional visible brane. The Higgs boson can mix with a radion, by a Higgs-radion mixing term. It is difficult to directly discover the heavy Kaluza-Klein(KK) particles at the Large Hadron Collider(LHC), because the mass of the lightest KK particle is expected to be above 10 TeV to satisfy constraints from avor changing neutral currents(FCNC). Instead, the precision measurements of the Higgs sector at the high luminosity LHC(HL-LHC) and the International Linear Collider(ILC) is a promising way to observe the deviation originating from the Higgs-radion mixing and radiative corrections from the KK gauge bosons and matter fermions. For some cases, those effects are separately determined, providing valuable information on the model. We perform an extensive scan of the model parameters to see the expected deviations of the Higgs couplings. We also choose several reference points consistent with the current data to show the precision of the fundamental parameter measurements at the future colliders. We also study the radion-Z-Z coupling in the model and discuss the role of the ILC for radion search.
|
hep-ph/9305345
|
Keijo Kajantie
|
K. Kajantie, K. Rummukainen and M. Shaposhnikov
|
A Lattice Monte Carlo Study of the Hot Electroweak Phase Transition
|
15 pages, use latex+epsfig, includes 6 ps-figures, CERN-TH.6901/93
|
Nucl.Phys. B407 (1993) 356-372
|
10.1016/0550-3213(93)90062-T
| null |
hep-ph hep-lat
| null |
We study the finite temperature electroweak phase transition with lattice
perturbation theory and Monte Carlo techniques. Dimensional reduction is used
to approximate the full four-dimensional SU(2) + a fundamental doublet Higgs
theory by an effective three-dimensional SU(2) + adjoint Higgs + fundamental
Higgs theory with coefficients depending on temperature via screening masses
and mass counterterms. Fermions contribute to the effective theory only via the
$N_F$ and $m_{\rm top}$ dependence of the coefficients. For sufficiently small
lattices ($N^3 < 30^3$ for $m_H$ = 35 GeV) the study of the one-loop lattice
effective potential shows the existence of the {\em second} order phase
transition even for the small Higgs masses. At the same time, a clear signal of
a {\em first order} phase transition is seen on the lattice simulations with a
transition temperature close to but less than the value determined from the
perturbative calculations. This indicates that the dynamics of the first order
electroweak phase transition depends strongly on non-perturbative effects and
is not exclusively related to the so-called $\phi^3$ term in the effective
potential.
|
[
{
"created": "Fri, 28 May 1993 15:25:46 GMT",
"version": "v1"
}
] |
2009-10-22
|
[
[
"Kajantie",
"K.",
""
],
[
"Rummukainen",
"K.",
""
],
[
"Shaposhnikov",
"M.",
""
]
] |
We study the finite temperature electroweak phase transition with lattice perturbation theory and Monte Carlo techniques. Dimensional reduction is used to approximate the full four-dimensional SU(2) + a fundamental doublet Higgs theory by an effective three-dimensional SU(2) + adjoint Higgs + fundamental Higgs theory with coefficients depending on temperature via screening masses and mass counterterms. Fermions contribute to the effective theory only via the $N_F$ and $m_{\rm top}$ dependence of the coefficients. For sufficiently small lattices ($N^3 < 30^3$ for $m_H$ = 35 GeV) the study of the one-loop lattice effective potential shows the existence of the {\em second} order phase transition even for the small Higgs masses. At the same time, a clear signal of a {\em first order} phase transition is seen on the lattice simulations with a transition temperature close to but less than the value determined from the perturbative calculations. This indicates that the dynamics of the first order electroweak phase transition depends strongly on non-perturbative effects and is not exclusively related to the so-called $\phi^3$ term in the effective potential.
|
1402.0768
|
G.R. Boroun
|
G.R.Boroun and B.Rezaei
|
The approximation method for calculation of the exponent of the gluon
distribution-$\lambda_{g}$ and the structure function-$\lambda_{S}$ at low
$x$
|
arXiv admin note: text overlap with arXiv:hep-ph/9712301 by other
authors
|
Physics of Atomic Nuclei, Vol. 71, No. 6, (2008)1076
|
10.1134/S1063778808060100
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We present a set of formulae using the solution of the QCD
Dokshitzer-Gribov-Lipatov-Altarelli-parisi (DGLAP) evolution equation to the
extract of the exponent $\lambda_g$ gluon distribution and $\lambda_S$
structure function from the Regge- like behavior at low $x$. The exponents are
found to be independent of $x$ and to increase linearly with ln$Q^{2}$ and
compared with the most data from H1 Collaboration. We also calculated the
structure function $F_{2}(x,Q^{2})$ and the gluon distribution $G(x,Q^{2})$ at
low $x$ assuming the Regge- like behavior of the gluon distribution function at
this limit and compared with NLO QCD fit to the H$1$ data, two Pomeron fit,
multipole Pomeron exchange fit and MRST (A.D.Martin, R.G.Roberts, W.J.Stirling
and R.S.Thorne), DL(A.Donnachie and P.V.Landshoff), NLO-GRV(M.Gluk, E.Reya and
A.Vogt) fit results, respectively.
|
[
{
"created": "Tue, 4 Feb 2014 15:37:35 GMT",
"version": "v1"
},
{
"created": "Thu, 20 Feb 2014 10:20:20 GMT",
"version": "v2"
},
{
"created": "Tue, 15 Nov 2016 15:49:12 GMT",
"version": "v3"
}
] |
2016-11-16
|
[
[
"Boroun",
"G. R.",
""
],
[
"Rezaei",
"B.",
""
]
] |
We present a set of formulae using the solution of the QCD Dokshitzer-Gribov-Lipatov-Altarelli-parisi (DGLAP) evolution equation to the extract of the exponent $\lambda_g$ gluon distribution and $\lambda_S$ structure function from the Regge- like behavior at low $x$. The exponents are found to be independent of $x$ and to increase linearly with ln$Q^{2}$ and compared with the most data from H1 Collaboration. We also calculated the structure function $F_{2}(x,Q^{2})$ and the gluon distribution $G(x,Q^{2})$ at low $x$ assuming the Regge- like behavior of the gluon distribution function at this limit and compared with NLO QCD fit to the H$1$ data, two Pomeron fit, multipole Pomeron exchange fit and MRST (A.D.Martin, R.G.Roberts, W.J.Stirling and R.S.Thorne), DL(A.Donnachie and P.V.Landshoff), NLO-GRV(M.Gluk, E.Reya and A.Vogt) fit results, respectively.
|
1906.05286
|
Keisuke Harigaya
|
Keisuke Harigaya
|
Nambu-Goldstone Affleck-Dine Baryogenesis
|
14 pages, 1 figure
| null |
10.1007/JHEP08(2019)085
| null |
hep-ph astro-ph.CO
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
The Affleck-Dine mechanism creates the baryon asymmetry of the universe from
an angular motion of a complex scalar field. The mechanism is efficient and
allows for a low reheating temperature of the universe if the scalar field has
a flat potential along its radial direction. We consider a possibility where
the scalar field is a pseudo-Nambu-Goldstone boson arising from spontaneous
breaking of an approximate global symmetry, so that the flatness of the
potential is naturally understood. We construct a concrete realization of the
idea based on chiral symmetry breaking in an SU(N) gauge theory. The
Peccei-Quinn mechanism can be consistently incorporated into the model. We also
comment on a possible impact of the model on early universe physics.
|
[
{
"created": "Wed, 12 Jun 2019 18:00:00 GMT",
"version": "v1"
}
] |
2019-09-04
|
[
[
"Harigaya",
"Keisuke",
""
]
] |
The Affleck-Dine mechanism creates the baryon asymmetry of the universe from an angular motion of a complex scalar field. The mechanism is efficient and allows for a low reheating temperature of the universe if the scalar field has a flat potential along its radial direction. We consider a possibility where the scalar field is a pseudo-Nambu-Goldstone boson arising from spontaneous breaking of an approximate global symmetry, so that the flatness of the potential is naturally understood. We construct a concrete realization of the idea based on chiral symmetry breaking in an SU(N) gauge theory. The Peccei-Quinn mechanism can be consistently incorporated into the model. We also comment on a possible impact of the model on early universe physics.
|
hep-ph/0612028
|
Fritz W. Bopp
|
J.Ranft
|
High energy hadron production Monte Carlos
|
10 pages, 7 figures, presented at Hadronic Shower simulation
workshop, FERMILAB Sept. 6-8, 2006
|
AIPConf.Proc.896:102-111,2007
|
10.1063/1.2720461
|
SI-HEP-2006-18
|
hep-ph
| null |
We discuss here Quantum molecular dynamics models (QMD) and Dual Parton
Models (DPM and QGSM). We compare RHIC data to DPM--models and we present a
(Cosmic ray oriented) model comparison.
|
[
{
"created": "Mon, 4 Dec 2006 15:49:07 GMT",
"version": "v1"
}
] |
2009-09-29
|
[
[
"Ranft",
"J.",
""
]
] |
We discuss here Quantum molecular dynamics models (QMD) and Dual Parton Models (DPM and QGSM). We compare RHIC data to DPM--models and we present a (Cosmic ray oriented) model comparison.
|
hep-ph/0611258
|
Soa Dang Van
|
Dang Van Soa, Hoang Ngoc Long and Le Nhu Thuc
|
Photon - Axion Conversion Cross Sections in a Resonant Cavity
|
8 pages, 1 figure
|
Mod.Phys.Lett.A22:1411-1416,2007
|
10.1142/S0217732307021482
| null |
hep-ph
| null |
Photon - axion conversions in the resonant cavity with the lowest mode are
considered in detail by the Feynman diagram method. The differential cross
sections are presented and numerical evaluations are given. It is shown that
there is a resonant conversion for the considered process, in which the
conversion cross sections are much larger than those of the wave guide in the
same conditions. Some estimates for experimental conditions are given from our
results.
|
[
{
"created": "Mon, 20 Nov 2006 12:45:19 GMT",
"version": "v1"
}
] |
2008-11-26
|
[
[
"Van Soa",
"Dang",
""
],
[
"Long",
"Hoang Ngoc",
""
],
[
"Thuc",
"Le Nhu",
""
]
] |
Photon - axion conversions in the resonant cavity with the lowest mode are considered in detail by the Feynman diagram method. The differential cross sections are presented and numerical evaluations are given. It is shown that there is a resonant conversion for the considered process, in which the conversion cross sections are much larger than those of the wave guide in the same conditions. Some estimates for experimental conditions are given from our results.
|
2406.08577
|
Ankita Budhraja
|
Ankita Budhraja and Wouter J. Waalewijn
|
FastEEC: Fast Evaluation of N-point Energy Correlators
|
10 pages, 4 figures. Associated code available at :
https://github.com/abudhraj/FastEEC/releases/tag/0.1
| null | null | null |
hep-ph hep-ex nucl-th
|
http://creativecommons.org/licenses/by/4.0/
|
Energy correlators characterize the asymptotic energy flow in scattering
events produced at colliders, from which the microscopic physics of the
scattering can be deduced. This view of collisions is akin to analyses of the
Cosmic Microwave Background, and a range of promising phenomenological
applications of energy correlators have been identified, including the study of
hadronization, the deadcone effect, measuring $\alpha_s$ and the top quark
mass. While $N$-point energy correlators are interesting to study for larger
values of $N$, their evaluation is computationally intensive, scaling like
$M^N/N!$, where $M$ is the number of particles. In this letter we develop a
fast method for their evaluation, exploiting that correlations at a given
angular scale are insensitive to effects at other (widely-separated) scales.
For concreteness we focus on the projected energy correlator, which projects
onto the largest separation between the $N$ directions. E.g.~for $N=7$ we find
a speed up of up to four orders of magnitude, depending on the desired
accuracy. We also consider the possibility of raising the energy to a power
higher than one in the energy correlator, which has been proposed to reduce
soft sensitivity, and further cuts back the required computation time. These
higher-power correlators are not collinear safe, but as a byproduct our
approach suggests a natural method to regularize them, such that they can be
described using perturbation theory. This letter is accompanied by a public
code that implements our method.
|
[
{
"created": "Wed, 12 Jun 2024 18:30:21 GMT",
"version": "v1"
}
] |
2024-06-14
|
[
[
"Budhraja",
"Ankita",
""
],
[
"Waalewijn",
"Wouter J.",
""
]
] |
Energy correlators characterize the asymptotic energy flow in scattering events produced at colliders, from which the microscopic physics of the scattering can be deduced. This view of collisions is akin to analyses of the Cosmic Microwave Background, and a range of promising phenomenological applications of energy correlators have been identified, including the study of hadronization, the deadcone effect, measuring $\alpha_s$ and the top quark mass. While $N$-point energy correlators are interesting to study for larger values of $N$, their evaluation is computationally intensive, scaling like $M^N/N!$, where $M$ is the number of particles. In this letter we develop a fast method for their evaluation, exploiting that correlations at a given angular scale are insensitive to effects at other (widely-separated) scales. For concreteness we focus on the projected energy correlator, which projects onto the largest separation between the $N$ directions. E.g.~for $N=7$ we find a speed up of up to four orders of magnitude, depending on the desired accuracy. We also consider the possibility of raising the energy to a power higher than one in the energy correlator, which has been proposed to reduce soft sensitivity, and further cuts back the required computation time. These higher-power correlators are not collinear safe, but as a byproduct our approach suggests a natural method to regularize them, such that they can be described using perturbation theory. This letter is accompanied by a public code that implements our method.
|
2312.14994
|
Alexandre Salas-Bern\'ardez
|
Reinhard Alkofer (Graz U.), Felipe J. Llanes-Estrada (Univ.
Complutense de Madrid and IPARCOS) and Alexandre Salas-Bernardez (IFIC and
Univ. Valencia, Univ. Complutense de Madrid and IPARCOS)
|
Spinning Pairs: Supporting $^3P_0$ Quark-Pair Creation from Landau Gauge
Green's Functions
|
22 pages, 13 figures
|
Phys. Rev. D 109, 074015; 15 April 2024
|
10.1103/PhysRevD.109.074015
|
IPARCOS-UCM-23-138
|
hep-ph
|
http://creativecommons.org/licenses/by-nc-sa/4.0/
|
Abundant phenomenology suggests that strong decays from relatively
low-excitation hadrons into other hadrons proceed by the creation of a light
quark-antiquark pair with zero total angular momentum, the so called $^3P_0$
mechanism originating from a scalar bilinear. Yet the Quantum Chromodynamics
(QCD) interaction is perturbatively mediated by gluons of spin one, and QCD
presents a chirally symmetric Lagrangian. Such scalar decay term must be
spontaneously generated upon breaking chiral symmetry. We attempt to reproduce
this with the help of the quark-gluon vertex in Landau gauge, whose
nonperturbative structure has been reasonably elucidated in the last years, and
insertions of a uniform, constant chromoelectric field. This is akin to
Schwinger pair production in Quantum Electrodynamics (QED), and we provide a
comparison with its two field-insertions diagram. We find that, the symmetry
being cylindrical, the adequate quantum numbers to discuss the production are
rather $^3\Sigma_0$, $^3\Sigma_1$ and $^3\Pi_0$ as in diatomic molecules, and
we indeed find a sizeable contribution of the third decay mechanism, which may
give a rationale for the $^3P_0$ phenomenology, as long as the momentum of the
produced pair is at or below the scale of the bare or dynamically generated
fermion mass. On the other hand, ultrarelativistic fermions are rather ejected
with $^3\Sigma_1$ quantum numbers. In QED, our results suggest that
$^3\Sigma_0$ dominates, whereas the constraint of producing a color singlet in
QCD leads to $^3\Pi_0$ dominance at sub-GeV momenta.
|
[
{
"created": "Fri, 22 Dec 2023 15:27:10 GMT",
"version": "v1"
},
{
"created": "Wed, 24 Apr 2024 09:20:50 GMT",
"version": "v2"
}
] |
2024-04-25
|
[
[
"Alkofer",
"Reinhard",
"",
"Graz U."
],
[
"Llanes-Estrada",
"Felipe J.",
"",
"Univ.\n Complutense de Madrid and IPARCOS"
],
[
"Salas-Bernardez",
"Alexandre",
"",
"IFIC and\n Univ. Valencia, Univ. Complutense de Madrid and IPARCOS"
]
] |
Abundant phenomenology suggests that strong decays from relatively low-excitation hadrons into other hadrons proceed by the creation of a light quark-antiquark pair with zero total angular momentum, the so called $^3P_0$ mechanism originating from a scalar bilinear. Yet the Quantum Chromodynamics (QCD) interaction is perturbatively mediated by gluons of spin one, and QCD presents a chirally symmetric Lagrangian. Such scalar decay term must be spontaneously generated upon breaking chiral symmetry. We attempt to reproduce this with the help of the quark-gluon vertex in Landau gauge, whose nonperturbative structure has been reasonably elucidated in the last years, and insertions of a uniform, constant chromoelectric field. This is akin to Schwinger pair production in Quantum Electrodynamics (QED), and we provide a comparison with its two field-insertions diagram. We find that, the symmetry being cylindrical, the adequate quantum numbers to discuss the production are rather $^3\Sigma_0$, $^3\Sigma_1$ and $^3\Pi_0$ as in diatomic molecules, and we indeed find a sizeable contribution of the third decay mechanism, which may give a rationale for the $^3P_0$ phenomenology, as long as the momentum of the produced pair is at or below the scale of the bare or dynamically generated fermion mass. On the other hand, ultrarelativistic fermions are rather ejected with $^3\Sigma_1$ quantum numbers. In QED, our results suggest that $^3\Sigma_0$ dominates, whereas the constraint of producing a color singlet in QCD leads to $^3\Pi_0$ dominance at sub-GeV momenta.
|
2206.00348
|
Chia-Wei Liu
|
Chao-Qiang Geng, Xiang-Nan Jin, Chia-Wei Liu, Zheng-Yi Wei and Jiabao
Zhang
|
New extraction of CP violation in b-baryon decays
|
Accepted by PLB
| null |
10.1016/j.physletb.2022.137429
| null |
hep-ph
|
http://creativecommons.org/licenses/by/4.0/
|
We study CP violation in b-baryon decays of $\Xi_b^- \to \Xi^- D$ with $D =
D^0, \bar{D}^0$ and $D_i~(i=1,2)$. We find that these baryonic decay processes
provide an ideal opportunity to measure the weak phase due to the absence of
the relative strong phase. Explicitly, we relate $\bar{\rho}$ and $\bar{\eta}$
the CKM elements with the decay rate ratios of $R_i= \Gamma(\Xi_b^- \to
\Xi^-D_{i} ) / \Gamma( \Xi_b^- \to \Xi^-D^0 )$ without the charge conjugate
states. As a complementary, we also examine the decay distributions of
$\Lambda_b \to \Lambda(\to p \pi^- ) D$. There are in total 32 decay
observables, which can be parameterized by 9 real parameters, allowing the
experiments to extract the angle $\gamma\equiv
\arg(-V_{ud}V_{ub}^*/V_{cd}V_{cb}^*)$ in the CKM unitarity triangle. In
addition, the feasibilities of the experimental measurements are discussed. We
find that $\bar{\rho}$ and $\bar{\eta}$ can be extracted at LHCb Run3 from
$\Xi_b^- \to \Xi^- D$, and a full analysis of $\Lambda_b \to \Lambda(\to p
\pi^-)D$ is available at LHCb Run4.
|
[
{
"created": "Wed, 1 Jun 2022 09:29:25 GMT",
"version": "v1"
},
{
"created": "Fri, 2 Sep 2022 13:39:36 GMT",
"version": "v2"
}
] |
2022-09-07
|
[
[
"Geng",
"Chao-Qiang",
""
],
[
"Jin",
"Xiang-Nan",
""
],
[
"Liu",
"Chia-Wei",
""
],
[
"Wei",
"Zheng-Yi",
""
],
[
"Zhang",
"Jiabao",
""
]
] |
We study CP violation in b-baryon decays of $\Xi_b^- \to \Xi^- D$ with $D = D^0, \bar{D}^0$ and $D_i~(i=1,2)$. We find that these baryonic decay processes provide an ideal opportunity to measure the weak phase due to the absence of the relative strong phase. Explicitly, we relate $\bar{\rho}$ and $\bar{\eta}$ the CKM elements with the decay rate ratios of $R_i= \Gamma(\Xi_b^- \to \Xi^-D_{i} ) / \Gamma( \Xi_b^- \to \Xi^-D^0 )$ without the charge conjugate states. As a complementary, we also examine the decay distributions of $\Lambda_b \to \Lambda(\to p \pi^- ) D$. There are in total 32 decay observables, which can be parameterized by 9 real parameters, allowing the experiments to extract the angle $\gamma\equiv \arg(-V_{ud}V_{ub}^*/V_{cd}V_{cb}^*)$ in the CKM unitarity triangle. In addition, the feasibilities of the experimental measurements are discussed. We find that $\bar{\rho}$ and $\bar{\eta}$ can be extracted at LHCb Run3 from $\Xi_b^- \to \Xi^- D$, and a full analysis of $\Lambda_b \to \Lambda(\to p \pi^-)D$ is available at LHCb Run4.
|
1007.5305
|
Igor Ivanov
|
Igor P. Ivanov, Venus Keus
|
Frustrated symmetries in multi-Higgs-doublet models
|
7 pages, no figures
|
Phys.Lett.B695:459-462,2011
|
10.1016/j.physletb.2010.11.059
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Within multi-Higgs-doublet models, one can impose symmetries on the Higgs
potential, either discrete or continuous, that mix several doublets. In
two-Higgs-doublet model any such symmetry can be conserved or spontaneously
violated after the electroweak symmetry breaking (EWSB), depending on the
coefficients of the potential. With more than two doublets, there exist
symmetries which are always spontaneously violated after EWSB. We discuss the
origin of this phenomenon and show its similarity to geometric frustration in
condensed-matter physics.
|
[
{
"created": "Thu, 29 Jul 2010 19:37:16 GMT",
"version": "v1"
}
] |
2011-01-04
|
[
[
"Ivanov",
"Igor P.",
""
],
[
"Keus",
"Venus",
""
]
] |
Within multi-Higgs-doublet models, one can impose symmetries on the Higgs potential, either discrete or continuous, that mix several doublets. In two-Higgs-doublet model any such symmetry can be conserved or spontaneously violated after the electroweak symmetry breaking (EWSB), depending on the coefficients of the potential. With more than two doublets, there exist symmetries which are always spontaneously violated after EWSB. We discuss the origin of this phenomenon and show its similarity to geometric frustration in condensed-matter physics.
|
1411.7835
|
Giovanni Marco Pruna Dr
|
Lorenzo Basso, Per Osland and Giovanni Marco Pruna
|
From realistic 2HDM-II CPV benchmarks to the $H^\pm \to\tau \nu$ decay
at the LHC
|
6 pages, 2 figures, "Prospects for Charged Higgs Discovery at
Colliders - CHARGED 2014"
|
PoS(Charged2014)028
| null |
PSI-PR-14-13
|
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Phenomenological studies of a CP-violating two-Higgs-doublet Model with
type-II Yukawa couplings are presented. In the light of recent LHC data, an
update on the viable parameter space that survives both the experimental and
theoretical constraints is provided. In addition, the scope of the LHC in
exploring this model through the discovery of a charged Higgs boson that decays
in the tauonic mode is analysed. For this, various production channels were
investigated, with emphasis on the boson-associated channel $gg\to H_i\to H^\pm
W^\mp$ and the fermion-associated channels $gb\to H^\pm t$ and $gg\to H^\pm
bt$. For the latter, a signal-over-background analysis is performed.
|
[
{
"created": "Fri, 28 Nov 2014 12:15:16 GMT",
"version": "v1"
}
] |
2015-02-16
|
[
[
"Basso",
"Lorenzo",
""
],
[
"Osland",
"Per",
""
],
[
"Pruna",
"Giovanni Marco",
""
]
] |
Phenomenological studies of a CP-violating two-Higgs-doublet Model with type-II Yukawa couplings are presented. In the light of recent LHC data, an update on the viable parameter space that survives both the experimental and theoretical constraints is provided. In addition, the scope of the LHC in exploring this model through the discovery of a charged Higgs boson that decays in the tauonic mode is analysed. For this, various production channels were investigated, with emphasis on the boson-associated channel $gg\to H_i\to H^\pm W^\mp$ and the fermion-associated channels $gb\to H^\pm t$ and $gg\to H^\pm bt$. For the latter, a signal-over-background analysis is performed.
|
hep-ph/9707546
|
Uri Sarid
|
Emidio Gabrielli and Uri Sarid
|
Low-Energy Signals for a Minimal Gauge-Mediated Model
|
LaTeX, 9 pages, including 1 (color) figure embedded using epsf
macros; minor change to text and figure, added 1 reference
|
Phys.Rev.Lett. 79 (1997) 4752-4755
|
10.1103/PhysRevLett.79.4752
|
UND-HEP-97-US02
|
hep-ph
| null |
The inclusive branching ratio $B \to X_s\gamma$ and the anomalous magnetic
moment $g_\mu-2$ of the muon are accurately calculated within a minimal
gauge-mediated SUSY-breaking model which naturally generates a large
$\tan\beta$. The predictions are in somewhat better agreement with current
experiments, and new data will soon critically test these predictions.
Predictions for $B \to X_s\ell^+\ell^-$ branching ratios and asymmetries, to be
tested at future colliders, are also presented.
|
[
{
"created": "Thu, 31 Jul 1997 23:43:32 GMT",
"version": "v1"
},
{
"created": "Fri, 1 Aug 1997 16:21:26 GMT",
"version": "v2"
}
] |
2009-10-30
|
[
[
"Gabrielli",
"Emidio",
""
],
[
"Sarid",
"Uri",
""
]
] |
The inclusive branching ratio $B \to X_s\gamma$ and the anomalous magnetic moment $g_\mu-2$ of the muon are accurately calculated within a minimal gauge-mediated SUSY-breaking model which naturally generates a large $\tan\beta$. The predictions are in somewhat better agreement with current experiments, and new data will soon critically test these predictions. Predictions for $B \to X_s\ell^+\ell^-$ branching ratios and asymmetries, to be tested at future colliders, are also presented.
|
1103.4321
|
Christoffer Flensburg
|
Christoffer Flensburg, G\"osta Gustafson and Leif L\"onnblad
|
Inclusive and Exclusive observables from dipoles in high energy
collisions
|
42 pages. v2: minor edits
|
Journal of High Energy Physics, Volume 2011, Number 8, 103
|
10.1007/JHEP08(2011)103
|
LU-TP 11-13, CERN-PH-TH-2011-058, MCnet-11-08
|
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We present a new model for simulating exclusive final states in minimum-bias
collisions between hadrons. In a series of papers we have developed a Monte
Carlo model based on Mueller's dipole picture of BFKL-evolution, supplemented
with non-leading corrections, which has shown to be very successful in
describing inclusive and semi-inclusive observables in hadron collisions. In
this paper we present a further extension of this model to also describe
exclusive final states. This is a highly non-trivial extension, and we have
encountered many details that influence the description, and for which no
guidance from perturbative QCD could be found. Hence we have had to make many
choices based on semi-classical and phenomenological arguments. The end result
is a new event generator called DIPSY which can be used to simulate complete
minimum-bias non-diffractive hadronic collision events. Although the
description of data from the Tevatron and LHC is not quite as good as for
PYTHIA, the most advanced of the general purpose event generator programs for
these processes, our results are clearly competitive, and can be expected to
improve with careful tuning. In addition, as our model is very different from
conventional multiple scattering scenaria, the DIPSY program can be used to
gain deeper insight in the soft and semi-hard processes involved both in
hadronic and heavy ion collisions.
|
[
{
"created": "Tue, 22 Mar 2011 17:35:20 GMT",
"version": "v1"
},
{
"created": "Thu, 20 Oct 2011 12:38:01 GMT",
"version": "v2"
}
] |
2011-10-21
|
[
[
"Flensburg",
"Christoffer",
""
],
[
"Gustafson",
"Gösta",
""
],
[
"Lönnblad",
"Leif",
""
]
] |
We present a new model for simulating exclusive final states in minimum-bias collisions between hadrons. In a series of papers we have developed a Monte Carlo model based on Mueller's dipole picture of BFKL-evolution, supplemented with non-leading corrections, which has shown to be very successful in describing inclusive and semi-inclusive observables in hadron collisions. In this paper we present a further extension of this model to also describe exclusive final states. This is a highly non-trivial extension, and we have encountered many details that influence the description, and for which no guidance from perturbative QCD could be found. Hence we have had to make many choices based on semi-classical and phenomenological arguments. The end result is a new event generator called DIPSY which can be used to simulate complete minimum-bias non-diffractive hadronic collision events. Although the description of data from the Tevatron and LHC is not quite as good as for PYTHIA, the most advanced of the general purpose event generator programs for these processes, our results are clearly competitive, and can be expected to improve with careful tuning. In addition, as our model is very different from conventional multiple scattering scenaria, the DIPSY program can be used to gain deeper insight in the soft and semi-hard processes involved both in hadronic and heavy ion collisions.
|
hep-ph/0203170
|
A. E. Radzhabov
|
M. K. Volkov, A.E. Radzhabov, N. L. Russakovich
|
Sigma-meson in hot and dense matter
|
16 pages, 8 figures; figures 6,7 replaced
|
Phys.Atom.Nucl.66:997-1004,2003; Yad.Fiz.66:1030-1037,2003
|
10.1134/1.1577922
| null |
hep-ph
| null |
An important role of the scalar isoscalar sigma-meson in the low-energy
physics is discussed. The behavior of the sigma-meson in the hot and dense
medium is studied. It is shown that in the vicinity of critical values of
temperature(T) and chemical potential(m) the sigma-meson can become a sharp
resonance. This effect can lead to a strong enhancement of the processes pi pi
-> gamma gamma and pi pi-> pi pi near the two-pion threshold. Experimental
observation of this phenomenon can be interpreted as a signal of approaching
the domain where the chiral symmetry restoration and phase transition of the
hadron matter into quark-gluon plasma take place.
|
[
{
"created": "Mon, 18 Mar 2002 14:33:34 GMT",
"version": "v1"
},
{
"created": "Fri, 22 Mar 2002 15:35:14 GMT",
"version": "v2"
}
] |
2014-11-17
|
[
[
"Volkov",
"M. K.",
""
],
[
"Radzhabov",
"A. E.",
""
],
[
"Russakovich",
"N. L.",
""
]
] |
An important role of the scalar isoscalar sigma-meson in the low-energy physics is discussed. The behavior of the sigma-meson in the hot and dense medium is studied. It is shown that in the vicinity of critical values of temperature(T) and chemical potential(m) the sigma-meson can become a sharp resonance. This effect can lead to a strong enhancement of the processes pi pi -> gamma gamma and pi pi-> pi pi near the two-pion threshold. Experimental observation of this phenomenon can be interpreted as a signal of approaching the domain where the chiral symmetry restoration and phase transition of the hadron matter into quark-gluon plasma take place.
|
hep-ph/9909212
|
Javier Ferrandis
|
Marco A.Diaz, Javier Ferrandis, Jose W.F. Valle
|
Supersymmetry Unification Predictions for M_top V_cb and tan(beta)
|
15 pages, including 6 figures. Latex
|
Nucl.Phys.B573:75-86,2000
|
10.1016/S0550-3213(99)00611-2
|
IFIC/99-61, FTUV/99-58, FSU-HEP-990710, UCCHEP/2-99
|
hep-ph
| null |
We study the predictions for M_top, tan(beta) and V_cb in a popular texture
ansatze for the fermion mass matrices. We do this both for the Minimal
Supersymmetric Standard Model (MSSM) and for the simplest model (MSSM-BRpV)
where a bilinear R-Parity violating term is added to the superpotential. We
find that taking the experimental values for M_top and V_cb at 99 % C.L. and
the GUT relations h_b=h_tau and (V_cb)^2=h_c/h_t within 5 %, the large
tan(beta) solution, characteristic in the MSSM with bottom--tau unification,
becomes disallowed. In contrast the corresponding allowed region for the
MSSM-BRpV is slightly larger. We also find that important modifications occur
if we relax the texture conditions at the GUT scale. For example, if the GUT
relations are imposed at 40 %, the large tan(beta) branch in the MSSM becomes
fully allowed. In addition, in MSSM-BRpV the whole tan(beta)-M_top plane become
allowed, finding unification at any value of tan(beta).
|
[
{
"created": "Wed, 1 Sep 1999 13:29:12 GMT",
"version": "v1"
}
] |
2009-09-17
|
[
[
"Diaz",
"Marco A.",
""
],
[
"Ferrandis",
"Javier",
""
],
[
"Valle",
"Jose W. F.",
""
]
] |
We study the predictions for M_top, tan(beta) and V_cb in a popular texture ansatze for the fermion mass matrices. We do this both for the Minimal Supersymmetric Standard Model (MSSM) and for the simplest model (MSSM-BRpV) where a bilinear R-Parity violating term is added to the superpotential. We find that taking the experimental values for M_top and V_cb at 99 % C.L. and the GUT relations h_b=h_tau and (V_cb)^2=h_c/h_t within 5 %, the large tan(beta) solution, characteristic in the MSSM with bottom--tau unification, becomes disallowed. In contrast the corresponding allowed region for the MSSM-BRpV is slightly larger. We also find that important modifications occur if we relax the texture conditions at the GUT scale. For example, if the GUT relations are imposed at 40 %, the large tan(beta) branch in the MSSM becomes fully allowed. In addition, in MSSM-BRpV the whole tan(beta)-M_top plane become allowed, finding unification at any value of tan(beta).
|
1303.4723
|
Maria Vittoria Garzelli
|
M.V. Garzelli, M. O'Loughlin, S. Nafooshe
|
Cosmic ray induced micro black hole showers
|
7 pages, 4 figures, Proceedings of the 13th International Conference
on Nuclear Reaction Mechanisms, Varenna, Italy, June 11 - 15 2012
|
CERN-Proceedings-2012-002 (2012), 525 - 530
| null | null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Extended air showers originate from interactions between ultra-high-energy
cosmic rays and nuclei in the Earth's atmosphere. At present there are some
discrepancies between experimental observed properties of these air showers and
theoretical predictions obtained by using standard hadronic interaction models
for cosmic ray primaries with laboratory energies above 10^5 - 10^6 TeV. In
this contribution, we will present a preliminary discussion of the possibility
(in the framework of TeV gravity models) that shower development may begin with
the production of a microscopic black hole (MBH) at the moment of the primary
collision, which then evaporates and decays, by emitting gravitons and Standard
Model quanta. From our preliminary investigations it appears that lepton
distributions are more likely to reveal the presence of a MBH than photon
distributions.
|
[
{
"created": "Tue, 19 Mar 2013 19:54:37 GMT",
"version": "v1"
}
] |
2013-03-20
|
[
[
"Garzelli",
"M. V.",
""
],
[
"O'Loughlin",
"M.",
""
],
[
"Nafooshe",
"S.",
""
]
] |
Extended air showers originate from interactions between ultra-high-energy cosmic rays and nuclei in the Earth's atmosphere. At present there are some discrepancies between experimental observed properties of these air showers and theoretical predictions obtained by using standard hadronic interaction models for cosmic ray primaries with laboratory energies above 10^5 - 10^6 TeV. In this contribution, we will present a preliminary discussion of the possibility (in the framework of TeV gravity models) that shower development may begin with the production of a microscopic black hole (MBH) at the moment of the primary collision, which then evaporates and decays, by emitting gravitons and Standard Model quanta. From our preliminary investigations it appears that lepton distributions are more likely to reveal the presence of a MBH than photon distributions.
|
1510.05267
|
Hua-Xing Chen
|
Qiang Mao, Hua-Xing Chen, Wei Chen, Atsushi Hosaka, Xiang Liu and
Shi-Lin Zhu
|
QCD sum rule calculation for P-wave bottom baryons
|
9 pages, 7 figures, 1 table, accepted by PRD
|
Phys. Rev. D 92, 114007 (2015)
|
10.1103/PhysRevD.92.114007
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We study the P-wave bottom baryons using the method of QCD sum rule and heavy
quark effective theory. Our results suggest that Lambda_b(5912) and
Lambda_b(5920) can be well described by the baryon doublet [3F_bar, 1, 1, rho],
and they belong to the SU(3) 3F_bar multiplets of J(P)=1/2(-) and 3/2(-). Their
SU(3) flavor partners, Xi_b(1/2-) and Xi_b(3/2-), have masses 6.06 \pm 0.13 GeV
and 6.07 \pm 0.13 GeV, respectively, with mass splitting 9 \pm 4 MeV. The
results obtained using baryon doublet [3F_bar, 1, 0, lambda] are similar and
also consistent with the experimental data. We also study the SU(3) 6F
multiplets by using the baryon multiplets [6F, 0, 1, lambda], [6_F, 1, 0, rho]
and [6F, 2, 1, lambda], and our results suggest that the P-wave bottom baryons
Sigma_b, Xi'_b and Omega_b have (averaged) masses about 6.0 GeV, 6.2 GeV and
6.4 GeV, respectively.
|
[
{
"created": "Sun, 18 Oct 2015 15:50:57 GMT",
"version": "v1"
},
{
"created": "Tue, 24 Nov 2015 01:53:36 GMT",
"version": "v2"
}
] |
2015-12-03
|
[
[
"Mao",
"Qiang",
""
],
[
"Chen",
"Hua-Xing",
""
],
[
"Chen",
"Wei",
""
],
[
"Hosaka",
"Atsushi",
""
],
[
"Liu",
"Xiang",
""
],
[
"Zhu",
"Shi-Lin",
""
]
] |
We study the P-wave bottom baryons using the method of QCD sum rule and heavy quark effective theory. Our results suggest that Lambda_b(5912) and Lambda_b(5920) can be well described by the baryon doublet [3F_bar, 1, 1, rho], and they belong to the SU(3) 3F_bar multiplets of J(P)=1/2(-) and 3/2(-). Their SU(3) flavor partners, Xi_b(1/2-) and Xi_b(3/2-), have masses 6.06 \pm 0.13 GeV and 6.07 \pm 0.13 GeV, respectively, with mass splitting 9 \pm 4 MeV. The results obtained using baryon doublet [3F_bar, 1, 0, lambda] are similar and also consistent with the experimental data. We also study the SU(3) 6F multiplets by using the baryon multiplets [6F, 0, 1, lambda], [6_F, 1, 0, rho] and [6F, 2, 1, lambda], and our results suggest that the P-wave bottom baryons Sigma_b, Xi'_b and Omega_b have (averaged) masses about 6.0 GeV, 6.2 GeV and 6.4 GeV, respectively.
|
2201.11905
|
Tong Li
|
Tong Li, Jiajun Liao, Rui-Jia Zhang
|
Dark magnetic dipole property in fermionic absorption by nucleus and
electrons
|
22 pages, 9 figures, 1 table. Version accepted for publication in
JHEP
| null |
10.1007/JHEP05(2022)071
| null |
hep-ph
|
http://creativecommons.org/licenses/by/4.0/
|
The fermionic dark matter (DM) absorption by nucleus or electron targets
provides a distinctive signal to search for sub-GeV DM. We consider a Dirac
fermion DM charged under a dark gauge group and with the dark magnetic dipole
operator. The DM field mixes with right-handed neutrino and interacts with the
ordinary electromagnetic charge current via the kinetic mixing term of gauge
fields. As a result, the incoming DM is absorbed and converted into neutrino in
final state through the dipole-charge interaction. For the DM absorption by
nucleus, the recoil energy spectrum exhibit a peak at $m_\chi^2/2m_N$ for each
isotope in the target. XENON1T can probe the DM mass above 27 MeV and the
projected constraint on the inelastic DM-nucleon cross section becomes
$10^{-49}$ cm$^2$. CRESSTIII with lower energy threshold would be sensitive to
the DM mass above 2 MeV. We also check that the contribution from the nuclear
magnetic dipole is negligible for $^{131}{\rm Xe}$ target. The absorption of DM
by bound electron target induces ionization signal and is sensitive to sub-MeV
DM mass. The involvement of the ionization form factor spreads out the
localized recoil energy. We show the future prospect for the constraint on the
magnetic dipole coupling from the electron ionization of $^{131}{\rm Xe}$.
|
[
{
"created": "Fri, 28 Jan 2022 02:41:40 GMT",
"version": "v1"
},
{
"created": "Thu, 21 Apr 2022 02:03:08 GMT",
"version": "v2"
}
] |
2022-06-01
|
[
[
"Li",
"Tong",
""
],
[
"Liao",
"Jiajun",
""
],
[
"Zhang",
"Rui-Jia",
""
]
] |
The fermionic dark matter (DM) absorption by nucleus or electron targets provides a distinctive signal to search for sub-GeV DM. We consider a Dirac fermion DM charged under a dark gauge group and with the dark magnetic dipole operator. The DM field mixes with right-handed neutrino and interacts with the ordinary electromagnetic charge current via the kinetic mixing term of gauge fields. As a result, the incoming DM is absorbed and converted into neutrino in final state through the dipole-charge interaction. For the DM absorption by nucleus, the recoil energy spectrum exhibit a peak at $m_\chi^2/2m_N$ for each isotope in the target. XENON1T can probe the DM mass above 27 MeV and the projected constraint on the inelastic DM-nucleon cross section becomes $10^{-49}$ cm$^2$. CRESSTIII with lower energy threshold would be sensitive to the DM mass above 2 MeV. We also check that the contribution from the nuclear magnetic dipole is negligible for $^{131}{\rm Xe}$ target. The absorption of DM by bound electron target induces ionization signal and is sensitive to sub-MeV DM mass. The involvement of the ionization form factor spreads out the localized recoil energy. We show the future prospect for the constraint on the magnetic dipole coupling from the electron ionization of $^{131}{\rm Xe}$.
|
1011.6362
|
Boris Kayser
|
Boris Kayser and Gino Segre
|
Leptogenesis at the Electroweak Scale
|
10 pages, 3 figures
| null |
10.1016/j.physletb.2011.09.022
|
FERMILAB-PUB-10-431-T
|
hep-ph hep-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
In this note we propose a model of leptogenesis in which the scale for the
mass of the necessary heavy neutral lepton is similar to the scale of
electroweak symmetry breaking.
|
[
{
"created": "Mon, 29 Nov 2010 20:39:42 GMT",
"version": "v1"
},
{
"created": "Mon, 9 May 2011 22:55:53 GMT",
"version": "v2"
},
{
"created": "Wed, 28 Sep 2011 02:06:34 GMT",
"version": "v3"
}
] |
2015-05-20
|
[
[
"Kayser",
"Boris",
""
],
[
"Segre",
"Gino",
""
]
] |
In this note we propose a model of leptogenesis in which the scale for the mass of the necessary heavy neutral lepton is similar to the scale of electroweak symmetry breaking.
|
1307.8027
|
Petr Satunin
|
Grigory Rubtsov, Petr Satunin and Sergey Sibiryakov
|
The influence of Lorentz violation on UHE photon detection
|
Presented at the Sixth Meeting on CPT and Lorentz Symmetry,
Bloomington, Indiana, June 17-21, 2013
| null |
10.1142/9789814566438_0048
| null |
hep-ph astro-ph.HE hep-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We show that violation of the Lorentz symmetry in quantum electrodynamics can
suppress the rates of the interactions crucial for the formation of
photon-induced air showers, such as pair production on nuclei and in the
geomagnetic field. As a consequence, the allowed region in the space of
Lorentz-violating parameters will be seriously restricted if several photons
with energies $\gtrsim\,10^{19}\, {eV}$ are detected.
|
[
{
"created": "Tue, 30 Jul 2013 15:58:09 GMT",
"version": "v1"
}
] |
2017-08-23
|
[
[
"Rubtsov",
"Grigory",
""
],
[
"Satunin",
"Petr",
""
],
[
"Sibiryakov",
"Sergey",
""
]
] |
We show that violation of the Lorentz symmetry in quantum electrodynamics can suppress the rates of the interactions crucial for the formation of photon-induced air showers, such as pair production on nuclei and in the geomagnetic field. As a consequence, the allowed region in the space of Lorentz-violating parameters will be seriously restricted if several photons with energies $\gtrsim\,10^{19}\, {eV}$ are detected.
|
2201.05170
|
Jan Jerhot
|
Jan Jerhot, Babette D\"obrich, Fatih Ertas, Felix Kahlhoefer, Tommaso
Spadaro
|
ALPINIST: Axion-Like Particles In Numerous Interactions Simulated and
Tabulated
|
24 pages + appendices, 7 figures, ALPINIST code available at
https://github.com/jjerhot/ALPINIST/
|
JHEP07(2022)094
|
10.1007/JHEP07(2022)094
|
TTK-22-04, CP3-22-02
|
hep-ph hep-ex
|
http://creativecommons.org/licenses/by/4.0/
|
Proton beam dump experiments are among the most promising strategies to
search for light and feebly interacting states such as axion-like particles
(ALPs). The interpretation of these experiments is however complicated by the
wide range of ALP models and the multitude of different production and decay
channels that can induce observable signals. Here we propose a new approach to
this problem by separating the calculation of constraints and projected
sensitivities into model-independent and model-dependent parts. The former rely
on extensive Monte Carlo simulations of ALP production and decays, as well as
estimates of the detection efficiencies based on simplified detector
geometries. Once these simulations have been performed and tabulated, the
latter parts only require simple analytical rescalings that can be performed
using the public code ALPINIST released together with this work. We illustrate
this approach by considering several ALP models with couplings to Standard
Model gauge bosons. For the case of ALPs coupled to gluons we show that the
sensitivity of proton beam dump experiments can be extended significantly by
considering hadronic ALP decays into three-body final states.
|
[
{
"created": "Thu, 13 Jan 2022 19:00:15 GMT",
"version": "v1"
},
{
"created": "Wed, 20 Jul 2022 14:43:28 GMT",
"version": "v2"
}
] |
2022-07-21
|
[
[
"Jerhot",
"Jan",
""
],
[
"Döbrich",
"Babette",
""
],
[
"Ertas",
"Fatih",
""
],
[
"Kahlhoefer",
"Felix",
""
],
[
"Spadaro",
"Tommaso",
""
]
] |
Proton beam dump experiments are among the most promising strategies to search for light and feebly interacting states such as axion-like particles (ALPs). The interpretation of these experiments is however complicated by the wide range of ALP models and the multitude of different production and decay channels that can induce observable signals. Here we propose a new approach to this problem by separating the calculation of constraints and projected sensitivities into model-independent and model-dependent parts. The former rely on extensive Monte Carlo simulations of ALP production and decays, as well as estimates of the detection efficiencies based on simplified detector geometries. Once these simulations have been performed and tabulated, the latter parts only require simple analytical rescalings that can be performed using the public code ALPINIST released together with this work. We illustrate this approach by considering several ALP models with couplings to Standard Model gauge bosons. For the case of ALPs coupled to gluons we show that the sensitivity of proton beam dump experiments can be extended significantly by considering hadronic ALP decays into three-body final states.
|
hep-ph/0610069
|
Rouzbeh Allahverdi
|
Rouzbeh Allahverdi, Anupam Mazumdar
|
Spectral tilt in A-term inflation
|
4 pages. v2: we have strengthened our comments
| null | null | null |
hep-ph astro-ph gr-qc hep-th
| null |
Recently in hep-ph/0605035 and hep-ph/0608138, we have shown that primordial
inflation can be embedded within the Minimal Supersymmetric Standard Model,
while providing the right amplitude for the density perturbations and a tilted
spectrum which matches the current data. In this short note we show that the
model predicts a range of spectral tilt, $0.92 \leq n_s \leq 1$, depending on
deviation from the saddle point condition. The spectral tilt saturates the
lower limit when the saddle point condition is met. On the other hand the upper
limit can be achieved for a slight deviation towards the point of inflection.
The running of the spectral tilt remains small, and the amplitude of the
temperature anisotropies remains in the correct observational regime.
|
[
{
"created": "Thu, 5 Oct 2006 20:28:01 GMT",
"version": "v1"
},
{
"created": "Thu, 26 Oct 2006 15:00:10 GMT",
"version": "v2"
}
] |
2007-05-23
|
[
[
"Allahverdi",
"Rouzbeh",
""
],
[
"Mazumdar",
"Anupam",
""
]
] |
Recently in hep-ph/0605035 and hep-ph/0608138, we have shown that primordial inflation can be embedded within the Minimal Supersymmetric Standard Model, while providing the right amplitude for the density perturbations and a tilted spectrum which matches the current data. In this short note we show that the model predicts a range of spectral tilt, $0.92 \leq n_s \leq 1$, depending on deviation from the saddle point condition. The spectral tilt saturates the lower limit when the saddle point condition is met. On the other hand the upper limit can be achieved for a slight deviation towards the point of inflection. The running of the spectral tilt remains small, and the amplitude of the temperature anisotropies remains in the correct observational regime.
|
hep-ph/0209150
|
Tommy Ohlsson
|
Tommy Ohlsson
|
Testing CPT Invariance with Neutrinos
|
4 pages, 1 figure, LaTeX. Talk presented at the XXXIst International
Conference on High Energy Physics (ICHEP 2002), Amsterdam, The Netherlands,
July 24-31, 2002. In collaboration with: Samoil M. Bilenky, Martin Freund,
Manfred Lindner, and Walter Winter
| null |
10.1016/S0920-5632(03)90486-5
| null |
hep-ph
| null |
We investigate possible tests of CPT invariance on the level of event rates
at neutrino factories. We do not assume any specific model, but
phenomenological differences in the neutrino-antineutrino masses and mixing
angles in a Lorentz invariance preserving context, which could be induced by
physics beyond the Standard Model. We especially focus on the muon neutrino and
antineutrino disappearance channels in order to obtain constraints on the
neutrino-antineutrino mass and mixing angle differences. In a typical neutrino
factory setup simulation, we find, for example, that $|m_3 - \bar{m}_3|
\lesssim 1.9 \cdot 10^{-4} \mathrm{eV}$ and $|\theta_{23} -\bar \theta_{23}|
\lesssim 2^\circ$.
|
[
{
"created": "Fri, 13 Sep 2002 11:59:42 GMT",
"version": "v1"
}
] |
2009-11-07
|
[
[
"Ohlsson",
"Tommy",
""
]
] |
We investigate possible tests of CPT invariance on the level of event rates at neutrino factories. We do not assume any specific model, but phenomenological differences in the neutrino-antineutrino masses and mixing angles in a Lorentz invariance preserving context, which could be induced by physics beyond the Standard Model. We especially focus on the muon neutrino and antineutrino disappearance channels in order to obtain constraints on the neutrino-antineutrino mass and mixing angle differences. In a typical neutrino factory setup simulation, we find, for example, that $|m_3 - \bar{m}_3| \lesssim 1.9 \cdot 10^{-4} \mathrm{eV}$ and $|\theta_{23} -\bar \theta_{23}| \lesssim 2^\circ$.
|
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