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|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
hep-ph/0405072
|
Heather E. Logan
|
Heather E. Logan (Wisconsin)
|
The Littlest Higgs boson at a photon collider
|
34 pages, 7 figures; v2: refs added, errors fixed in Eqs. 18, 20,
A2-A4, A12, A15, numerics updated, Sec.VI added with expanded discussion of
uncertainties, conclusions unchanged; v3: refs added, minor changes to text,
version to appear in PRD
|
Phys.Rev. D70 (2004) 115003
|
10.1103/PhysRevD.70.115003
|
MADPH-04-1378
|
hep-ph
| null |
We calculate the corrections to the partial widths of the light Higgs boson
in the Littlest Higgs model due to effects of the TeV-scale physics. We focus
on the loop-induced Higgs coupling to photon pairs, which is especially
sensitive to the effects of new particles running in the loop. This coupling
can be probed with high precision at a photon collider in the process gamma
gamma -> H -> b bbar for a light Higgs boson with mass 115 GeV <= MH <~ 140
GeV. Using future LHC measurements of the parameters of the Littlest Higgs
model, one can calculate a prediction for this process, which will serve as a
test of the model and as a probe for a strongly-coupled UV completion at the 10
TeV scale. We outline the prospects for measuring these parameters with
sufficient precision to match the expected experimental uncertainty on gamma
gamma -> H -> b bbar.
|
[
{
"created": "Sun, 9 May 2004 00:14:54 GMT",
"version": "v1"
},
{
"created": "Mon, 26 Jul 2004 17:05:31 GMT",
"version": "v2"
},
{
"created": "Thu, 4 Nov 2004 22:43:46 GMT",
"version": "v3"
}
] |
2009-11-10
|
[
[
"Logan",
"Heather E.",
"",
"Wisconsin"
]
] |
We calculate the corrections to the partial widths of the light Higgs boson in the Littlest Higgs model due to effects of the TeV-scale physics. We focus on the loop-induced Higgs coupling to photon pairs, which is especially sensitive to the effects of new particles running in the loop. This coupling can be probed with high precision at a photon collider in the process gamma gamma -> H -> b bbar for a light Higgs boson with mass 115 GeV <= MH <~ 140 GeV. Using future LHC measurements of the parameters of the Littlest Higgs model, one can calculate a prediction for this process, which will serve as a test of the model and as a probe for a strongly-coupled UV completion at the 10 TeV scale. We outline the prospects for measuring these parameters with sufficient precision to match the expected experimental uncertainty on gamma gamma -> H -> b bbar.
|
1908.09796
|
Yilei Tang
|
Yi-Lei Tang
|
Structures of the Massive Vector Boson Propagators at Finite Temperature
Illuminated by the Goldstone Equivalence Gauge
|
Typos corrected
|
JHEP10(2020)180
|
10.1007/JHEP10(2020)180
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Inspired by the Goldstone equivalence gauge, we study the thermal corrections
to an originally massive vector boson by checking the poles and branch cuts. We
find that part of the Goldstone boson is spewed out from the longitudinal
polarization, becoming a branch cut which can be approximated by the
"quasi-poles" in the thermal environment. In this case, physical Goldstone
boson somehow partly recovers. We also show the Feynmann rules for the
"external legs" of these vector boson as well as the recovered Goldstone boson,
expecting to simplify the vector boson participated process calculations by
adopting the similar "tree-level" logic as in the zero temperature situation.
Gauge boson mixing case are also discussed. Similar results are shown in other
gauges, especially in the $R_\xi$ gauge.
|
[
{
"created": "Mon, 26 Aug 2019 16:56:12 GMT",
"version": "v1"
},
{
"created": "Mon, 2 Sep 2019 20:31:57 GMT",
"version": "v2"
},
{
"created": "Fri, 25 Oct 2019 12:36:59 GMT",
"version": "v3"
},
{
"created": "Mon, 13 Jan 2020 16:35:41 GMT",
"version": "v4"
},
{
"created": "Mon, 25 May 2020 09:41:54 GMT",
"version": "v5"
},
{
"created": "Fri, 30 Oct 2020 04:08:29 GMT",
"version": "v6"
}
] |
2020-12-02
|
[
[
"Tang",
"Yi-Lei",
""
]
] |
Inspired by the Goldstone equivalence gauge, we study the thermal corrections to an originally massive vector boson by checking the poles and branch cuts. We find that part of the Goldstone boson is spewed out from the longitudinal polarization, becoming a branch cut which can be approximated by the "quasi-poles" in the thermal environment. In this case, physical Goldstone boson somehow partly recovers. We also show the Feynmann rules for the "external legs" of these vector boson as well as the recovered Goldstone boson, expecting to simplify the vector boson participated process calculations by adopting the similar "tree-level" logic as in the zero temperature situation. Gauge boson mixing case are also discussed. Similar results are shown in other gauges, especially in the $R_\xi$ gauge.
|
2303.04056
|
A. D. Polosa
|
Luciano Maiani, Antonio D. Polosa, Veronica Riquer
|
The Pentaquark Spectrum from Fermi Statistics
|
15 pages, 2 figures
| null |
10.1140/epjc/s10052-023-11492-0
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We study compact hidden charm pentaquarks in the Born-Oppenheimer
approximation, previously introduced for tetraquarks, assuming the heavy pair
to be in a color octet. We show that Fermi statistics applied to the complex of
the three light quarks, also in color octet, requires S-wave pentaquark ground
states to consist of three octets of flavour-SU(3)_f, two with spin 1/2 and one
with spin 3/2, in line with the observed, strangeness S=0,-1, spectrum.
Additional lines corresponding to decays into J/\psi + Sigma and J/\psi + Xi
are predicted. In the language of non-relativistic SU(6), ground state
pentaquarks form either a 56 or a 20 representation, distinguished by presence
or absence of pentaquarks decaying in the spin 3/2 decuplet, e.g. in J/\psi +
Delta^++. Observation of a strangeness S=-2 or isospin I=3/2 pentaquarks would
be a clear signature of compact, QCD bound pentaquarks.
|
[
{
"created": "Tue, 7 Mar 2023 17:08:06 GMT",
"version": "v1"
}
] |
2023-05-24
|
[
[
"Maiani",
"Luciano",
""
],
[
"Polosa",
"Antonio D.",
""
],
[
"Riquer",
"Veronica",
""
]
] |
We study compact hidden charm pentaquarks in the Born-Oppenheimer approximation, previously introduced for tetraquarks, assuming the heavy pair to be in a color octet. We show that Fermi statistics applied to the complex of the three light quarks, also in color octet, requires S-wave pentaquark ground states to consist of three octets of flavour-SU(3)_f, two with spin 1/2 and one with spin 3/2, in line with the observed, strangeness S=0,-1, spectrum. Additional lines corresponding to decays into J/\psi + Sigma and J/\psi + Xi are predicted. In the language of non-relativistic SU(6), ground state pentaquarks form either a 56 or a 20 representation, distinguished by presence or absence of pentaquarks decaying in the spin 3/2 decuplet, e.g. in J/\psi + Delta^++. Observation of a strangeness S=-2 or isospin I=3/2 pentaquarks would be a clear signature of compact, QCD bound pentaquarks.
|
1010.3946
|
Sebastian Philipp Schneider
|
Sebastian P. Schneider, Bastian Kubis, Christoph Ditsche
|
Rescattering effects in eta {\to} 3pi decays
|
48 pages, 5 figures; appendix C added, version published in JHEP
|
JHEP 1102:028,2011
|
10.1007/JHEP02(2011)028
|
HISKP-TH-10/26
|
hep-ph hep-ex nucl-ex
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
The isospin-breaking decay eta {\to} 3pi is an ideal tool to extract
information on light quark mass ratios from experiment. For a precise
determination, however, a detailed description of the Dalitz plot distribution
is necessary. In that respect, in particular the slope parameter alpha of the
neutral decay channel causes some concern, since the one-loop prediction from
chiral perturbation theory misses the experimental value substantially. We use
the modified non-relativistic effective field-theory, a dedicated framework to
analyze final-state interactions beyond one loop including isospin-breaking
corrections, to extract charged and neutral Dalitz plot parameters. Matching to
chiral perturbation theory at next-to-leading order, we find alpha = -0.025 +-
0.005, in marginal agreement with experimental findings. We derive a relation
between charged and neutral decay parameters that points towards a significant
tension between the most recent KLOE measurements of these observables.
|
[
{
"created": "Tue, 19 Oct 2010 15:12:34 GMT",
"version": "v1"
},
{
"created": "Wed, 16 Feb 2011 15:10:06 GMT",
"version": "v2"
}
] |
2011-02-17
|
[
[
"Schneider",
"Sebastian P.",
""
],
[
"Kubis",
"Bastian",
""
],
[
"Ditsche",
"Christoph",
""
]
] |
The isospin-breaking decay eta {\to} 3pi is an ideal tool to extract information on light quark mass ratios from experiment. For a precise determination, however, a detailed description of the Dalitz plot distribution is necessary. In that respect, in particular the slope parameter alpha of the neutral decay channel causes some concern, since the one-loop prediction from chiral perturbation theory misses the experimental value substantially. We use the modified non-relativistic effective field-theory, a dedicated framework to analyze final-state interactions beyond one loop including isospin-breaking corrections, to extract charged and neutral Dalitz plot parameters. Matching to chiral perturbation theory at next-to-leading order, we find alpha = -0.025 +- 0.005, in marginal agreement with experimental findings. We derive a relation between charged and neutral decay parameters that points towards a significant tension between the most recent KLOE measurements of these observables.
|
1504.02388
|
Jian Wang
|
Chong Sheng Li, Hai Tao Li, Ding Yu Shao and Jian Wang
|
Soft gluon resummation in the signal-background interference process of
$gg(\to h^*) \to ZZ$
|
18 pages, 9 figures; v2 published in JHEP
|
JHEP08(2015)065
|
10.1007/JHEP08(2015)065
|
MITP/15-016
|
hep-ph hep-ex
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We present a precise theoretical prediction for the signal-background
interference process of $gg(\to h^*) \to ZZ$, which is useful to constrain the
Higgs boson decay width and to measure Higgs couplings to the SM particles. The
approximate NNLO $K$-factor is in the range of $2.05-2.45$ ($1.85-2.25$),
depending on $M_{ZZ}$, at the 8 (13) TeV LHC. And the soft gluon resummation
can increase the approximate NNLO result by about $10\%$ at both the 8 TeV and
13 TeV LHC. The theoretical uncertainties including the scale, uncalculated
multi-loop amplitudes of the background and PDF$+\alpha_s$ are roughly
$\mathcal{O}(10\%)$ at ${\rm NNLL'}$. We also confirm that the approximate
$K$-factors in the interference and the pure signal processes are the same.
|
[
{
"created": "Thu, 9 Apr 2015 16:59:52 GMT",
"version": "v1"
},
{
"created": "Tue, 18 Aug 2015 17:33:27 GMT",
"version": "v2"
}
] |
2015-08-19
|
[
[
"Li",
"Chong Sheng",
""
],
[
"Li",
"Hai Tao",
""
],
[
"Shao",
"Ding Yu",
""
],
[
"Wang",
"Jian",
""
]
] |
We present a precise theoretical prediction for the signal-background interference process of $gg(\to h^*) \to ZZ$, which is useful to constrain the Higgs boson decay width and to measure Higgs couplings to the SM particles. The approximate NNLO $K$-factor is in the range of $2.05-2.45$ ($1.85-2.25$), depending on $M_{ZZ}$, at the 8 (13) TeV LHC. And the soft gluon resummation can increase the approximate NNLO result by about $10\%$ at both the 8 TeV and 13 TeV LHC. The theoretical uncertainties including the scale, uncalculated multi-loop amplitudes of the background and PDF$+\alpha_s$ are roughly $\mathcal{O}(10\%)$ at ${\rm NNLL'}$. We also confirm that the approximate $K$-factors in the interference and the pure signal processes are the same.
|
1604.03285
|
Hoang Ngoc Long
|
T. T. Thuc, L. T. Hue, H. N. Long, T. Phong Nguyen
|
Lepton flavor violating decay of SM-like Higgs in a radiative neutrino
mass model
|
25 pages, 7 figures, matches published version in PRD
|
Phys. Rev. D 93, 115026 (2016)
|
10.1103/PhysRevD.93.115026
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
The lepton flavor violating decay of the Standard Model-like Higgs (LFVHD) is
discussed in the framework of the radiative neutrino mass model built in
\cite{Kenji}. The branching ratio (BR) of the LFVHD are shown to reach
$10^{-5}$ in the most interesting region of the parameter space shown in
\cite{Kenji}. The dominant contributions come from the singly charged Higgs
mediations, namely the coupling of $h^\pm_2$ with exotic neutrinos.
Furthermore, if doubly charged Higgs is heavy enough to allow the mass of
$h^\pm_2$ around 1 TeV, the mentioned BR can reach $10^{-4}$. Besides, we have
obtained that the large values of the Br$(h\rightarrow\mu\tau)$ leads to very
small ones of the Br$(h\rightarrow e\tau)$, much smaller than various
sensitivity of current experiments.
|
[
{
"created": "Tue, 12 Apr 2016 08:11:03 GMT",
"version": "v1"
},
{
"created": "Mon, 20 Jun 2016 16:24:12 GMT",
"version": "v2"
}
] |
2016-06-21
|
[
[
"Thuc",
"T. T.",
""
],
[
"Hue",
"L. T.",
""
],
[
"Long",
"H. N.",
""
],
[
"Nguyen",
"T. Phong",
""
]
] |
The lepton flavor violating decay of the Standard Model-like Higgs (LFVHD) is discussed in the framework of the radiative neutrino mass model built in \cite{Kenji}. The branching ratio (BR) of the LFVHD are shown to reach $10^{-5}$ in the most interesting region of the parameter space shown in \cite{Kenji}. The dominant contributions come from the singly charged Higgs mediations, namely the coupling of $h^\pm_2$ with exotic neutrinos. Furthermore, if doubly charged Higgs is heavy enough to allow the mass of $h^\pm_2$ around 1 TeV, the mentioned BR can reach $10^{-4}$. Besides, we have obtained that the large values of the Br$(h\rightarrow\mu\tau)$ leads to very small ones of the Br$(h\rightarrow e\tau)$, much smaller than various sensitivity of current experiments.
|
2402.19131
|
Xing-Xing Dong
|
Xing-Xing Dong, Shu-Min Zhao, Jia-Peng Huo, Tong-Tong Wang, Tai-Fu
Feng
|
Charged Lepton Flavor Violation in the B-L symmetric SSM
|
to be published in Physical Review D
| null | null | null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Charged lepton flavor violation (CLFV) represents a clear new physics (NP)
signal beyond the standard model (SM). In this work, we investigate CLFV
processes $l_j^-\rightarrow l_i^- \gamma$ utilizing mass insertion
approximation(MIA) in the minimal supersymmetric extension of the SM with local
B-L gauge symmetry (B-LSSM). The MIA method can provide a set of simple
analytic formulae for the form factors and the associated effective vertices,
so that the movement of the CLFV decays $l_j^-\rightarrow l_i^- \gamma$ with
the sensitive parameters will be intuitively analyzed. Considering the SM-like
Higgs boson mass and the muon anomalous dipole moment (MDM) within $4\sigma$,
$3\sigma$ and $2\sigma$ regions, we discuss the corresponding constraints on
the relevant parameter space of the model.
|
[
{
"created": "Thu, 29 Feb 2024 13:07:01 GMT",
"version": "v1"
}
] |
2024-03-01
|
[
[
"Dong",
"Xing-Xing",
""
],
[
"Zhao",
"Shu-Min",
""
],
[
"Huo",
"Jia-Peng",
""
],
[
"Wang",
"Tong-Tong",
""
],
[
"Feng",
"Tai-Fu",
""
]
] |
Charged lepton flavor violation (CLFV) represents a clear new physics (NP) signal beyond the standard model (SM). In this work, we investigate CLFV processes $l_j^-\rightarrow l_i^- \gamma$ utilizing mass insertion approximation(MIA) in the minimal supersymmetric extension of the SM with local B-L gauge symmetry (B-LSSM). The MIA method can provide a set of simple analytic formulae for the form factors and the associated effective vertices, so that the movement of the CLFV decays $l_j^-\rightarrow l_i^- \gamma$ with the sensitive parameters will be intuitively analyzed. Considering the SM-like Higgs boson mass and the muon anomalous dipole moment (MDM) within $4\sigma$, $3\sigma$ and $2\sigma$ regions, we discuss the corresponding constraints on the relevant parameter space of the model.
|
hep-ph/0603256
|
Bernd-Jochen Schaefer
|
Bernd-Jochen Schaefer, Jochen Wambach
|
Susceptibilities near the QCD (tri)critical point
|
14 pages, 19 figures; v3 typos and minor changes, references added
|
Phys.Rev.D75:085015,2007
|
10.1103/PhysRevD.75.085015
| null |
hep-ph hep-th nucl-th
| null |
Based on the proper-time renormalization group approach, the scalar and the
quark number susceptibilities in the vicinity of possible critical end points
of the hadronic phase diagram are investigated in the two-flavor quark-meson
model. After discussing the quark-mass dependence of the location of such
points, the critical behavior of the in-medium meson masses and quark number
density are calculated. The universality classes of the end points are
determined by calculating the critical exponents of the susceptibilities. In
order to numerically estimate the influence of fluctuations we compare all
quantities with results from a mean-field approximation. It is concluded that
the region in the phase diagram where the susceptibilities are enhanced is more
compressed around the critical end point if fluctuations are included.
|
[
{
"created": "Thu, 30 Mar 2006 14:01:47 GMT",
"version": "v1"
},
{
"created": "Tue, 4 Apr 2006 15:20:14 GMT",
"version": "v2"
},
{
"created": "Fri, 7 Jul 2006 14:25:50 GMT",
"version": "v3"
}
] |
2008-11-26
|
[
[
"Schaefer",
"Bernd-Jochen",
""
],
[
"Wambach",
"Jochen",
""
]
] |
Based on the proper-time renormalization group approach, the scalar and the quark number susceptibilities in the vicinity of possible critical end points of the hadronic phase diagram are investigated in the two-flavor quark-meson model. After discussing the quark-mass dependence of the location of such points, the critical behavior of the in-medium meson masses and quark number density are calculated. The universality classes of the end points are determined by calculating the critical exponents of the susceptibilities. In order to numerically estimate the influence of fluctuations we compare all quantities with results from a mean-field approximation. It is concluded that the region in the phase diagram where the susceptibilities are enhanced is more compressed around the critical end point if fluctuations are included.
|
0708.1553
|
Huanjun Zhang
|
Guoli Liu, Huanjun Zhang
|
Single top production associated with a neutral scalar at LHC in
topcolor-assisted technicolor
|
7 pages, 3 figs
| null |
10.1088/1674-1137/32/9/004
| null |
hep-ph
| null |
The topcolor-assisted technicolor (TC2) model predicts a number of neutral
scalars like the top-pion ($\pi^0_t$) and the top-Higgs ($h^0_t$). These
scalars have flavor-changing neutral-current (FCNC) top quark couplings, among
which the top-charm transition couplings may be sizable. Such FCNC couplings
induce single top productions associated with a neutral scalar at the CERN
Large Hadron Collider (LHC) through the parton processes $cg \to t \pi_t^0$ and
$cg \to t h_t^0$. In this note we examine these productions and find their
production rates can exceed the $3\sigma$ sensitivity of the LHC in a large
part of parameter space. Since in the Standard Model and the minimal
supersymmetric model such rare productions have unobservably small production
rates at the LHC, these rare processes will serve as a good probe for the TC2
model.
|
[
{
"created": "Sat, 11 Aug 2007 09:14:31 GMT",
"version": "v1"
}
] |
2015-05-13
|
[
[
"Liu",
"Guoli",
""
],
[
"Zhang",
"Huanjun",
""
]
] |
The topcolor-assisted technicolor (TC2) model predicts a number of neutral scalars like the top-pion ($\pi^0_t$) and the top-Higgs ($h^0_t$). These scalars have flavor-changing neutral-current (FCNC) top quark couplings, among which the top-charm transition couplings may be sizable. Such FCNC couplings induce single top productions associated with a neutral scalar at the CERN Large Hadron Collider (LHC) through the parton processes $cg \to t \pi_t^0$ and $cg \to t h_t^0$. In this note we examine these productions and find their production rates can exceed the $3\sigma$ sensitivity of the LHC in a large part of parameter space. Since in the Standard Model and the minimal supersymmetric model such rare productions have unobservably small production rates at the LHC, these rare processes will serve as a good probe for the TC2 model.
|
hep-ph/9403318
| null |
Nick Evans
|
Strong Extended Technicolour Interactions and the $Zb\bar{b}$ Vertex
|
9 pages + 3 appended ps figures, SWAT/27
|
Phys.Lett. B331 (1994) 378-382
|
10.1016/0370-2693(94)91067-7
| null |
hep-ph
| null |
LEP precision measurements of the $Zb\bar{b}$ vertex coupling are
sufficiently accurate to see the non-oblique corrections from the heavy gauge
boson responsible for the large top mass in standard extended tecnicolour
models. If the ETC couplings are strong the techni-fermion condensate may be
enhanced by several orders of magnitude allowing a top mass of order 150GeV to
be obtained for large values of the ETC breaking scale sufficient to supress
the ETC contribution to the $Zb{\bar b}$ vertex. In this letter we investigate
the degree of fine tuning of the ETC coupling required in a realistic model. We
conclude that the fine tuning need only be of order $10\%$.
|
[
{
"created": "Mon, 21 Mar 1994 13:18:54 GMT",
"version": "v1"
}
] |
2009-10-28
|
[
[
"Evans",
"Nick",
""
]
] |
LEP precision measurements of the $Zb\bar{b}$ vertex coupling are sufficiently accurate to see the non-oblique corrections from the heavy gauge boson responsible for the large top mass in standard extended tecnicolour models. If the ETC couplings are strong the techni-fermion condensate may be enhanced by several orders of magnitude allowing a top mass of order 150GeV to be obtained for large values of the ETC breaking scale sufficient to supress the ETC contribution to the $Zb{\bar b}$ vertex. In this letter we investigate the degree of fine tuning of the ETC coupling required in a realistic model. We conclude that the fine tuning need only be of order $10\%$.
|
1105.3434
|
Martin Wiebusch
|
Patrick Gonz\'alez, J\"urgen Rohrwild, Martin Wiebusch
|
Electroweak Precision Observables within a Fourth Generation Model with
General Flavour Structure
| null |
Eur. Phys. J. C (2012) 72:2007
|
10.1140/epjc/s10052-012-2007-0
|
TTP11-15
|
hep-ph
|
http://creativecommons.org/licenses/by-nc-sa/3.0/
|
We calculate the contributions to electroweak precision observables (EWPOs)
due to a fourth generation of fermions with the most general (quark-)flavour
structure (but assuming Dirac neutrinos and a trivial flavour structure in the
lepton sector). The new-physics contributions to the EWPOs are calculated at
one-loop order using automated tools (FeynArts/FormCalc). No further
approximations are made in our calculation. We discuss the size of non-oblique
contributions arising from Z--quark--anti-quark vertex corrections and the
dependence of the EWPOs on all CKM mixing angles involving the fourth
generation. We find that the electroweak precision observables are sensitive to
two of the fourth-generation mixing angles and that the corresponding
constraints on these angles are competitive with those obtained from flavour
physics. For non-trivial 4x4 flavour structures, the non-oblique contributions
lead to relative corrections of several permille and should be included in a
global fit.
|
[
{
"created": "Tue, 17 May 2011 16:58:51 GMT",
"version": "v1"
},
{
"created": "Thu, 3 May 2012 17:18:41 GMT",
"version": "v2"
}
] |
2012-06-20
|
[
[
"González",
"Patrick",
""
],
[
"Rohrwild",
"Jürgen",
""
],
[
"Wiebusch",
"Martin",
""
]
] |
We calculate the contributions to electroweak precision observables (EWPOs) due to a fourth generation of fermions with the most general (quark-)flavour structure (but assuming Dirac neutrinos and a trivial flavour structure in the lepton sector). The new-physics contributions to the EWPOs are calculated at one-loop order using automated tools (FeynArts/FormCalc). No further approximations are made in our calculation. We discuss the size of non-oblique contributions arising from Z--quark--anti-quark vertex corrections and the dependence of the EWPOs on all CKM mixing angles involving the fourth generation. We find that the electroweak precision observables are sensitive to two of the fourth-generation mixing angles and that the corresponding constraints on these angles are competitive with those obtained from flavour physics. For non-trivial 4x4 flavour structures, the non-oblique contributions lead to relative corrections of several permille and should be included in a global fit.
|
hep-ph/0403292
|
Luc Marleau
|
L. Marleau (U. Laval)
|
Solving Skyrmions
|
16 pages (LATEX), jhep.cls, no figure
| null | null |
LAVAL-PHY-04-11
|
hep-ph
| null |
We find exact solutions for Skyrmions for the Skyrme-like models.
Constructing first the recursion formulae at small and large distance behavior,
we proceed by implementing these constraints to a chosen parametrization of the
solutions. The procedure is applied to the spherically symmetric hedgehog
solution and to topological number N > 1 solutions based on rational maps.
|
[
{
"created": "Tue, 30 Mar 2004 18:16:46 GMT",
"version": "v1"
}
] |
2007-05-23
|
[
[
"Marleau",
"L.",
"",
"U. Laval"
]
] |
We find exact solutions for Skyrmions for the Skyrme-like models. Constructing first the recursion formulae at small and large distance behavior, we proceed by implementing these constraints to a chosen parametrization of the solutions. The procedure is applied to the spherically symmetric hedgehog solution and to topological number N > 1 solutions based on rational maps.
|
2202.04608
|
Ian Banta
|
Ian Banta
|
A Strongly First-Order Electroweak Phase Transition from Loryons
|
21 pages, 2 figures. Matches published version. Updates to sections 2
and 3.2 and miscellaneous minor changes relative to v1
|
JHEP 06 (2022), 099
|
10.1007/JHEP06(2022)099
| null |
hep-ph
|
http://creativecommons.org/licenses/by/4.0/
|
We study the effect of BSM particles receiving most of their mass from their
coupling to the Higgs boson ("Loryons") on the electroweak phase transition.
The existence of BSM Loryons would imply that electroweak symmetry must be
non-linearly realized in the effective theory of the Standard Model. Since, by
definition, Loryons have a significant coupling to the Higgs, they are expected
to have a significant effect on the Higgs effective potential and thereby the
electroweak phase transition. We show that the BSM Loryon parameter space
viable under current experimental and theoretical constraints overlaps heavily
with the parameter space in which a strongly first-order phase transition is
predicted. The portion of the experimentally allowed parameter space which
gives a strongly first-order phase transition is significantly larger for
Loryons as compared to non-Loryons.
|
[
{
"created": "Wed, 9 Feb 2022 18:03:53 GMT",
"version": "v1"
},
{
"created": "Wed, 10 Aug 2022 15:34:05 GMT",
"version": "v2"
}
] |
2022-08-11
|
[
[
"Banta",
"Ian",
""
]
] |
We study the effect of BSM particles receiving most of their mass from their coupling to the Higgs boson ("Loryons") on the electroweak phase transition. The existence of BSM Loryons would imply that electroweak symmetry must be non-linearly realized in the effective theory of the Standard Model. Since, by definition, Loryons have a significant coupling to the Higgs, they are expected to have a significant effect on the Higgs effective potential and thereby the electroweak phase transition. We show that the BSM Loryon parameter space viable under current experimental and theoretical constraints overlaps heavily with the parameter space in which a strongly first-order phase transition is predicted. The portion of the experimentally allowed parameter space which gives a strongly first-order phase transition is significantly larger for Loryons as compared to non-Loryons.
|
1005.4930
|
Pavel Fileviez Perez
|
Pavel Fileviez Perez, Sogee Spinner
|
The Fate of R-Parity
| null |
Phys.Rev.D83:035004,2011
|
10.1103/PhysRevD.83.035004
| null |
hep-ph hep-ex
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
The possible origin of the R-parity violating interactions in the minimal
supersymmetric standard model and its connection to the radiative symmetry
breaking mechanism (RSBM) is investigated. In the context of the simplest model
where the implementation of the RSBM is possible, we find that in the majority
of the parameter space R-parity is spontaneously broken at the low-scale. These
results hint at the possibility that R-parity violating processes will be
observed at the Large Hadron Collider, if Supersymmetry is realized in nature.
|
[
{
"created": "Wed, 26 May 2010 20:00:17 GMT",
"version": "v1"
}
] |
2011-02-18
|
[
[
"Perez",
"Pavel Fileviez",
""
],
[
"Spinner",
"Sogee",
""
]
] |
The possible origin of the R-parity violating interactions in the minimal supersymmetric standard model and its connection to the radiative symmetry breaking mechanism (RSBM) is investigated. In the context of the simplest model where the implementation of the RSBM is possible, we find that in the majority of the parameter space R-parity is spontaneously broken at the low-scale. These results hint at the possibility that R-parity violating processes will be observed at the Large Hadron Collider, if Supersymmetry is realized in nature.
|
1704.03878
|
Jesse Thaler
|
Philippe Gras, Stefan H\"oche, Deepak Kar, Andrew Larkoski, Leif
L\"onnblad, Simon Pl\"atzer, Andrzej Si\'odmok, Peter Skands, Gregory Soyez,
Jesse Thaler
|
Systematics of quark/gluon tagging
|
50 pages, 20 figures, extended version of the Les Houches 2015 study
from arXiv:1605.04692; v2: updated to approximately match journal version,
including improved discussion of nonperturbative Casimir scaling and more
umlauts
|
JHEP 1707 (2017) 091
|
10.1007/JHEP07(2017)091
|
MIT-CTP 4885, CoEPP-MN-17-2, MCNET-17-04
|
hep-ph hep-ex
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
By measuring the substructure of a jet, one can assign it a "quark" or
"gluon" tag. In the eikonal (double-logarithmic) limit, quark/gluon
discrimination is determined solely by the color factor of the initiating
parton (C_F versus C_A). In this paper, we confront the challenges faced when
going beyond this leading-order understanding, using both parton-shower
generators and first-principles calculations to assess the impact of
higher-order perturbative and nonperturbative physics. Working in the idealized
context of electron-positron collisions, where one can define a proxy for quark
and gluon jets based on the Lorentz structure of the production vertex, we find
a fascinating interplay between perturbative shower effects and nonperturbative
hadronization effects. Turning to proton-proton collisions, we highlight a core
set of measurements that would constrain current uncertainties in quark/gluon
tagging and improve the overall modeling of jets at the Large Hadron Collider.
|
[
{
"created": "Wed, 12 Apr 2017 18:00:00 GMT",
"version": "v1"
},
{
"created": "Tue, 8 Aug 2017 13:50:15 GMT",
"version": "v2"
}
] |
2017-08-09
|
[
[
"Gras",
"Philippe",
""
],
[
"Höche",
"Stefan",
""
],
[
"Kar",
"Deepak",
""
],
[
"Larkoski",
"Andrew",
""
],
[
"Lönnblad",
"Leif",
""
],
[
"Plätzer",
"Simon",
""
],
[
"Siódmok",
"Andrzej",
""
],
[
"Skands",
"Peter",
""
],
[
"Soyez",
"Gregory",
""
],
[
"Thaler",
"Jesse",
""
]
] |
By measuring the substructure of a jet, one can assign it a "quark" or "gluon" tag. In the eikonal (double-logarithmic) limit, quark/gluon discrimination is determined solely by the color factor of the initiating parton (C_F versus C_A). In this paper, we confront the challenges faced when going beyond this leading-order understanding, using both parton-shower generators and first-principles calculations to assess the impact of higher-order perturbative and nonperturbative physics. Working in the idealized context of electron-positron collisions, where one can define a proxy for quark and gluon jets based on the Lorentz structure of the production vertex, we find a fascinating interplay between perturbative shower effects and nonperturbative hadronization effects. Turning to proton-proton collisions, we highlight a core set of measurements that would constrain current uncertainties in quark/gluon tagging and improve the overall modeling of jets at the Large Hadron Collider.
|
hep-ph/9211228
|
My Account
|
J. Lopez, D. Nanopoulos, H. Pois, and A. Zichichi
|
Proposed Tests for Minimal SU(5) Supergravity at Fermilab, Gran Sasso,
SuperKamiokande, and LEP
|
10 pages plus two figures (included as postscript files);
CTP-TAMU-72/92, CERN-TH.6716/92
|
Phys.Lett.B299:262-266,1993
|
10.1016/0370-2693(93)90257-I
| null |
hep-ph
| null |
A series of predictions are worked out in order to put the minimal $SU(5)$
supergravity model under experimental test. Using the two-loop gauge coupling
renormalization group equations, with the inclusion of supersymmetric threshold
corrections, we calculate a new value for the proton decay rate in this model
and find that SuperKamiokande and Gran Sasso should see the proton decay mode
$p\to\bar\nu K^+$ for most of the allowed parameter space. A set of physically
sensible assumptions and the cosmological requirement of a not too young
Universe give us a rather restrictive set of allowed points in the parameter
space, which characterizes this model. This set implies the existence of
interesting correlations among various masses: either the lightest chargino and
the next-to-lightest neutralino are below $\approx100\GeV$ (and therefore
observable at the Tevatron) or the lightest Higgs boson is below
$\approx50\GeV$ (and therefore observable at LEP I-II). These tests are crucial
steps towards selecting the correct low-energy effective supergravity model. We
also comment on the compatibility of the model with $\sin^2\theta_w(M_Z)$
measurements as a function of $\alpha_3(M_Z)$.
|
[
{
"created": "Sun, 8 Nov 1992 01:22:35 GMT",
"version": "v1"
}
] |
2009-08-25
|
[
[
"Lopez",
"J.",
""
],
[
"Nanopoulos",
"D.",
""
],
[
"Pois",
"H.",
""
],
[
"Zichichi",
"A.",
""
]
] |
A series of predictions are worked out in order to put the minimal $SU(5)$ supergravity model under experimental test. Using the two-loop gauge coupling renormalization group equations, with the inclusion of supersymmetric threshold corrections, we calculate a new value for the proton decay rate in this model and find that SuperKamiokande and Gran Sasso should see the proton decay mode $p\to\bar\nu K^+$ for most of the allowed parameter space. A set of physically sensible assumptions and the cosmological requirement of a not too young Universe give us a rather restrictive set of allowed points in the parameter space, which characterizes this model. This set implies the existence of interesting correlations among various masses: either the lightest chargino and the next-to-lightest neutralino are below $\approx100\GeV$ (and therefore observable at the Tevatron) or the lightest Higgs boson is below $\approx50\GeV$ (and therefore observable at LEP I-II). These tests are crucial steps towards selecting the correct low-energy effective supergravity model. We also comment on the compatibility of the model with $\sin^2\theta_w(M_Z)$ measurements as a function of $\alpha_3(M_Z)$.
|
hep-ph/9403260
|
Evan Reidell
|
Xiangdong Ji
|
$Q^2$-Dependence of Deep Inelastic Sum Rules
|
8 pages in plain TeX with PostScript figures to follow, MIT-CTP-2288
| null | null | null |
hep-ph
| null |
In this talk, I will concentrate on $Q^2$-dependence of deep inelastic sum
rules. I will first give a modern definition of deep-inelastic sum rules and
then discuss physical origins of their scaling violation at finite $Q^2$.
Following this, I discuss a few well-known examples, in particular, the Bjorken
sum rule, which is at the center of interest of this symposium. Finally, I
consider the $Q^2 \to 0$ limit of sum rules using low-energy theorems. I think
this can motivate some interesting CEBAF physics.
|
[
{
"created": "Wed, 9 Mar 1994 22:58:00 GMT",
"version": "v1"
}
] |
2007-05-23
|
[
[
"Ji",
"Xiangdong",
""
]
] |
In this talk, I will concentrate on $Q^2$-dependence of deep inelastic sum rules. I will first give a modern definition of deep-inelastic sum rules and then discuss physical origins of their scaling violation at finite $Q^2$. Following this, I discuss a few well-known examples, in particular, the Bjorken sum rule, which is at the center of interest of this symposium. Finally, I consider the $Q^2 \to 0$ limit of sum rules using low-energy theorems. I think this can motivate some interesting CEBAF physics.
|
1502.03008
|
Lu\'is Lavoura
|
L. Lavoura
|
New texture-zero models for lepton mixing
|
22 pages
| null | null |
CFTP/15-01
|
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
I systematically consider, in the context of the type-I see-saw mechanism,
all the predictive cases in which both the Dirac mass matrix connecting the
left-handed neutrinos to the right-handed neutrinos, and the Majorana mass
matrix of the latter neutrinos, feature texture zeros, while the mass matrix of
the charged leptons is diagonal. I have found a few cases which had not been
discussed in the literature previously.
|
[
{
"created": "Tue, 10 Feb 2015 17:41:13 GMT",
"version": "v1"
}
] |
2015-02-11
|
[
[
"Lavoura",
"L.",
""
]
] |
I systematically consider, in the context of the type-I see-saw mechanism, all the predictive cases in which both the Dirac mass matrix connecting the left-handed neutrinos to the right-handed neutrinos, and the Majorana mass matrix of the latter neutrinos, feature texture zeros, while the mass matrix of the charged leptons is diagonal. I have found a few cases which had not been discussed in the literature previously.
|
hep-ph/0411133
|
Ryuichiro Kitano
|
Ryuichiro Kitano and Ian Low
|
Dark Matter from Baryon Asymmetry
|
12 pages; v2: bounds on the mass of the messenger particle are
relaxed; conclusions unchanged. additional minor modifications
|
Phys.Rev. D71 (2005) 023510
|
10.1103/PhysRevD.71.023510
| null |
hep-ph astro-ph
| null |
The measured densities of dark and baryonic matter are surprisingly close to
each other, even though the baryon asymmetry and the dark matter are usually
explained by unrelated mechanisms. We consider a scenario where the dark matter
S is produced non-thermally from the decay of a messenger particle X, which
carries the baryon number and compensates for the baryon asymmetry in the
Universe, thereby establishing a connection between the baryonic and dark
matter densities. We propose a simple model to realize this scenario, adding
only a light singlet fermion S and a colored particle X which has a mass in the
O(TeV) range and a lifetime to appear long-lived in collider detector.
Therefore in hadron colliders the signal is similar to that of a stable or
long-lived gluino in supersymmetric models.
|
[
{
"created": "Tue, 9 Nov 2004 21:49:42 GMT",
"version": "v1"
},
{
"created": "Mon, 3 Jan 2005 16:27:04 GMT",
"version": "v2"
}
] |
2009-11-10
|
[
[
"Kitano",
"Ryuichiro",
""
],
[
"Low",
"Ian",
""
]
] |
The measured densities of dark and baryonic matter are surprisingly close to each other, even though the baryon asymmetry and the dark matter are usually explained by unrelated mechanisms. We consider a scenario where the dark matter S is produced non-thermally from the decay of a messenger particle X, which carries the baryon number and compensates for the baryon asymmetry in the Universe, thereby establishing a connection between the baryonic and dark matter densities. We propose a simple model to realize this scenario, adding only a light singlet fermion S and a colored particle X which has a mass in the O(TeV) range and a lifetime to appear long-lived in collider detector. Therefore in hadron colliders the signal is similar to that of a stable or long-lived gluino in supersymmetric models.
|
hep-ph/9608413
| null |
Sean Fleming (University of Wisconsin, Madison), Oscar F. Hernandez
(Universite de Montreal), Ivan Maksymyk (University of Texas, Austin), Helene
Nadeau (McGill University, Montreal)
|
NRQCD matrix elements in polarization of J-Psi produced from b-decay
|
9 pages, Revtex, 2 figures
|
Phys.Rev. D55 (1997) 4098-4104
|
10.1103/PhysRevD.55.4098
|
MADPH-96-953, UTTG-11-96,McGill-96-26,UdeM-GPP-TH-96-40
|
hep-ph hep-ex
| null |
We present the non-relativistic QCD (NRQCD) prediction for the polarization
of the J-Psi produced in b to J-Psi + X, as well as the helicity-summed
production rate. We propose that these observables provide a means of measuring
the three most important color-octet NRQCD matrix elements involved in J-Psi
production. Anticipating the measurement of the polarization parameter alpha,
we determine its expected range given current experimental bounds on the
color-octet matrix elements.
|
[
{
"created": "Thu, 22 Aug 1996 15:44:46 GMT",
"version": "v1"
}
] |
2009-10-28
|
[
[
"Fleming",
"Sean",
"",
"University of Wisconsin, Madison"
],
[
"Hernandez",
"Oscar F.",
"",
"Universite de Montreal"
],
[
"Maksymyk",
"Ivan",
"",
"University of Texas, Austin"
],
[
"Nadeau",
"Helene",
"",
"McGill University, Montreal"
]
] |
We present the non-relativistic QCD (NRQCD) prediction for the polarization of the J-Psi produced in b to J-Psi + X, as well as the helicity-summed production rate. We propose that these observables provide a means of measuring the three most important color-octet NRQCD matrix elements involved in J-Psi production. Anticipating the measurement of the polarization parameter alpha, we determine its expected range given current experimental bounds on the color-octet matrix elements.
|
1206.4191
|
Jacques Soffer
|
Claude Bourrely, Franco Buccella and Jacques Soffer
|
The statistical model for parton distributions
|
7 pages, 3 figures, Invited talk at XX International Workshop on
"`Deep-Inelastic Scattering and related subjects"', University of Bonn,
Germany, March 26-30 2012, presented by F. Buccella, to appear in the
conference proceedings
| null | null | null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
The phenomenological motivations, the expressions and the comparison with
experiment of the parton distributions inspired by the quantum statistics are
described. The Fermi-Dirac expressions for the quarks and their antiparticles
automatically account for the correlation between the shape and the first
moments of the valence partons, as well as the flavor and spin asymmetries of
the sea. One is able to describe with a small number of parameters both
unpolarized and polarized structure functions.
|
[
{
"created": "Tue, 19 Jun 2012 12:31:52 GMT",
"version": "v1"
}
] |
2012-06-20
|
[
[
"Bourrely",
"Claude",
""
],
[
"Buccella",
"Franco",
""
],
[
"Soffer",
"Jacques",
""
]
] |
The phenomenological motivations, the expressions and the comparison with experiment of the parton distributions inspired by the quantum statistics are described. The Fermi-Dirac expressions for the quarks and their antiparticles automatically account for the correlation between the shape and the first moments of the valence partons, as well as the flavor and spin asymmetries of the sea. One is able to describe with a small number of parameters both unpolarized and polarized structure functions.
|
2103.12123
|
Howard Baer
|
Howard Baer, Vernon Barger, Shadman Salam and Hasan Serce
|
Sparticle and Higgs boson masses from the landscape: dynamical versus
spontaneous supersymmetry breaking
|
14 pages, 11 .png figures
| null |
10.1103/PhysRevD.104.115025
|
OU-HEP-210322
|
hep-ph hep-th
|
http://creativecommons.org/licenses/by/4.0/
|
Perturbative supersymmetry breaking on the landscape of string vacua is
expected to favor large soft terms as a power-law or log distribution, but
tempered by an anthropic veto of inappropriate vacua or vacua leading to too
large a value for the derived weak scale -- a violation of the atomic
principle. Indeed, scans of such vacua yield a statistical prediction for light
Higgs boson mass m_h~ 125 GeV with sparticles (save possibly light higgsinos)
typically beyond LHC reach. In contrast, models of dynamical SUSY breaking
(DSB) -- with a hidden sector gauge coupling g^2 scanned uniformly -- lead to
gaugino condensation and a uniform distribution of soft parameters on a log
scale. Then soft terms are expected to be distributed as $m_{\rm soft}^{-1}$
favoring small values. A scan of DSB soft terms generally leads to $m_h\ll 125$
GeV and sparticle masses usually below LHC limits. Thus, the DSB landscape
scenario seems excluded from LHC search results. An alternative is that the
exponential suppression of the weak scale is set anthropically on the landscape
via the atomic principle.
|
[
{
"created": "Mon, 22 Mar 2021 18:29:05 GMT",
"version": "v1"
}
] |
2022-01-05
|
[
[
"Baer",
"Howard",
""
],
[
"Barger",
"Vernon",
""
],
[
"Salam",
"Shadman",
""
],
[
"Serce",
"Hasan",
""
]
] |
Perturbative supersymmetry breaking on the landscape of string vacua is expected to favor large soft terms as a power-law or log distribution, but tempered by an anthropic veto of inappropriate vacua or vacua leading to too large a value for the derived weak scale -- a violation of the atomic principle. Indeed, scans of such vacua yield a statistical prediction for light Higgs boson mass m_h~ 125 GeV with sparticles (save possibly light higgsinos) typically beyond LHC reach. In contrast, models of dynamical SUSY breaking (DSB) -- with a hidden sector gauge coupling g^2 scanned uniformly -- lead to gaugino condensation and a uniform distribution of soft parameters on a log scale. Then soft terms are expected to be distributed as $m_{\rm soft}^{-1}$ favoring small values. A scan of DSB soft terms generally leads to $m_h\ll 125$ GeV and sparticle masses usually below LHC limits. Thus, the DSB landscape scenario seems excluded from LHC search results. An alternative is that the exponential suppression of the weak scale is set anthropically on the landscape via the atomic principle.
|
1401.5443
|
Li Cheng
|
Li Cheng, Alper Hayreter and German Valencia
|
Top-quark forward-backward asymmetry from a color-octet t-channel
resonance
|
References added and corrected, typos fixed
|
Phys. Rev. D 89, 095009 (2014)
|
10.1103/PhysRevD.89.095009
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We consider new physics contributions to the top-quark forward-backward
asymmetry from a neutral $V^0_8$ or charged $V^+_8$ color-octet vector
exchanged in the $t$-channel. We study the phenomenological constraints on
these particles arising from the Tevatron and LHC7 measurements and compare
them with those on their color singlet counterparts $Z^\prime$ and $W^\prime$.
We find that the color octets fare better than the singlets in that they
generate a lower $A_C$, a lower high-invariant mass cross-section at LHC7 and a
lower same sign top-pair cross-section. However, they also generate a lower
$A_{FB}$ than their color-singlet counterparts.
|
[
{
"created": "Tue, 21 Jan 2014 20:09:00 GMT",
"version": "v1"
},
{
"created": "Thu, 30 Jan 2014 21:06:47 GMT",
"version": "v2"
}
] |
2015-07-10
|
[
[
"Cheng",
"Li",
""
],
[
"Hayreter",
"Alper",
""
],
[
"Valencia",
"German",
""
]
] |
We consider new physics contributions to the top-quark forward-backward asymmetry from a neutral $V^0_8$ or charged $V^+_8$ color-octet vector exchanged in the $t$-channel. We study the phenomenological constraints on these particles arising from the Tevatron and LHC7 measurements and compare them with those on their color singlet counterparts $Z^\prime$ and $W^\prime$. We find that the color octets fare better than the singlets in that they generate a lower $A_C$, a lower high-invariant mass cross-section at LHC7 and a lower same sign top-pair cross-section. However, they also generate a lower $A_{FB}$ than their color-singlet counterparts.
|
2203.13786
|
Wei-Hong Liang
|
Jia-Ting Li, Jia-Xin Lin, Gong-Jie Zhang, Wei-Hong Liang and E. Oset
|
The $\bar B_s^0 \to J/\psi \pi^0 \eta$ decay and the $a_0(980)-f_0(980)$
mixing
|
12 pages, 4 figures; v2: version published in Chin. Phys. C
| null |
10.1088/1674-1137/ac6cd5
| null |
hep-ph
|
http://creativecommons.org/licenses/by/4.0/
|
We study the $\bar B_s^0 \to J/\psi f_0(980)$ and $\bar B_s^0 \to J/\psi
a_0(980)$ reactions, and pay attention to the different sources of isospin
violation and mixing of $f_0(980)$ and $a_0(980)$ resonances where these
resonances are dynamically generated from meson-meson interaction. We find that
the main cause of isospin violation is the isospin breaking in the meson-meson
transition $T$ matrices, and the other source is that the loops involving kaons
in the production mechanism do not cancel due to the different masses of the
charged and neutral kaons. We obtain a branching ratio for $a_0(980)$
production of the order of $5 \times 10^{-6}$. Future experiments can address
this problem, and the production rate and shape of the $\pi^0 \eta$ mass
distribution will definitely help to better understand the nature of scalar
resonances.
|
[
{
"created": "Fri, 25 Mar 2022 17:11:27 GMT",
"version": "v1"
},
{
"created": "Mon, 30 Oct 2023 12:26:35 GMT",
"version": "v2"
}
] |
2023-10-31
|
[
[
"Li",
"Jia-Ting",
""
],
[
"Lin",
"Jia-Xin",
""
],
[
"Zhang",
"Gong-Jie",
""
],
[
"Liang",
"Wei-Hong",
""
],
[
"Oset",
"E.",
""
]
] |
We study the $\bar B_s^0 \to J/\psi f_0(980)$ and $\bar B_s^0 \to J/\psi a_0(980)$ reactions, and pay attention to the different sources of isospin violation and mixing of $f_0(980)$ and $a_0(980)$ resonances where these resonances are dynamically generated from meson-meson interaction. We find that the main cause of isospin violation is the isospin breaking in the meson-meson transition $T$ matrices, and the other source is that the loops involving kaons in the production mechanism do not cancel due to the different masses of the charged and neutral kaons. We obtain a branching ratio for $a_0(980)$ production of the order of $5 \times 10^{-6}$. Future experiments can address this problem, and the production rate and shape of the $\pi^0 \eta$ mass distribution will definitely help to better understand the nature of scalar resonances.
|
hep-ph/0106277
|
Jing Jiang
|
Tao Han, Jing Jiang (U. of Wisconsin), Marc Sher (William and Mary)
|
Search for t->ch at e+e- Linear Colliders
|
12 pages, 5 figures, 2 tables
|
Phys.Lett. B516 (2001) 337-344
|
10.1016/S0370-2693(01)00949-2
|
MADPH-01-1230, WM-01-107
|
hep-ph
| null |
We study the rare top-quark decay t->ch, where h is a generic Higgs boson, at
a linear collider. If kinematically accessible, all models contain this decay
at some level due to quark flavor mixing. Some models, such as Model III of the
two-Higgs doublet model, have a tree-level top-charm-Higgs coupling, and the
branching ratio is close to 0.5%. Others, such as the MSSM, have a coupling
induced at one-loop, and can have a branching ratio in the range of 10^{-5} -
5x10^{-4}. We find that a linear collider of root(s) = 500 GeV and a luminosity
of 500 fb^{-1} will begin to be sensitive to this range of the coupling.
|
[
{
"created": "Mon, 25 Jun 2001 15:17:02 GMT",
"version": "v1"
}
] |
2009-11-07
|
[
[
"Han",
"Tao",
"",
"U. of Wisconsin"
],
[
"Jiang",
"Jing",
"",
"U. of Wisconsin"
],
[
"Sher",
"Marc",
"",
"William and Mary"
]
] |
We study the rare top-quark decay t->ch, where h is a generic Higgs boson, at a linear collider. If kinematically accessible, all models contain this decay at some level due to quark flavor mixing. Some models, such as Model III of the two-Higgs doublet model, have a tree-level top-charm-Higgs coupling, and the branching ratio is close to 0.5%. Others, such as the MSSM, have a coupling induced at one-loop, and can have a branching ratio in the range of 10^{-5} - 5x10^{-4}. We find that a linear collider of root(s) = 500 GeV and a luminosity of 500 fb^{-1} will begin to be sensitive to this range of the coupling.
|
hep-ph/0703264
|
Mannque Rho
|
Mannque Rho
|
Hidden Local Symmetry and the Vector Manifestation of Chiral Symmetry in
Hot and/or Dense Matter
|
Based in part on talks given at The 1st Asian Triangle Heavy Ion
Conference, 2006, Seoul, Korea and at The Yukawa International Seminar
(YKIS), 2006, "New Frontiers in QCD", Kyoto, Japan
|
Prog.Theor.Phys.Suppl.168:519-526,2007
|
10.1143/PTPS.168.519
| null |
hep-ph nucl-th
| null |
The emergence and importance of hidden local symmetry in the structure of
hadrons under extreme conditions is discussed. The topics covered are the
potentially important role played by an infinite tower of vector mesons encoded
in holographic dual QCD (or AdS/QCD) in chiral dynamics of mesons and baryons,
in the vector dominance and its violation in EW response functions and the
presence of the vector manifestation fixed point and its influence on the
properties of hadrons in hot temperature (i.e., in relativistic heavy ion
collisions) and in dense matter (i.e., in compact stars). Also discussed are
the natural emergence of instantons/skyrmions from the infinite tower of vector
mesons coupled to pions in AdS/QCD and their (speculated) role in chiral
restoration at high density.
|
[
{
"created": "Sat, 24 Mar 2007 10:55:31 GMT",
"version": "v1"
}
] |
2008-11-26
|
[
[
"Rho",
"Mannque",
""
]
] |
The emergence and importance of hidden local symmetry in the structure of hadrons under extreme conditions is discussed. The topics covered are the potentially important role played by an infinite tower of vector mesons encoded in holographic dual QCD (or AdS/QCD) in chiral dynamics of mesons and baryons, in the vector dominance and its violation in EW response functions and the presence of the vector manifestation fixed point and its influence on the properties of hadrons in hot temperature (i.e., in relativistic heavy ion collisions) and in dense matter (i.e., in compact stars). Also discussed are the natural emergence of instantons/skyrmions from the infinite tower of vector mesons coupled to pions in AdS/QCD and their (speculated) role in chiral restoration at high density.
|
1009.4344
|
Arkadii Kozhevnikov
|
N.N. Achasov, A.A. Kozhevnikov
|
Troubles of describing multiple pion production in chiral dynamics
|
11 pages, 8 figures. The talk given by A.A. Kozhevnikov at the
International Seminar "Quarks-2010", Kolomna, Russia, June 6-12, 2010
| null | null | null |
hep-ph hep-ex nucl-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Generalized Hidden Local Symmetry (GHLS) model as the chiral model of
pseudoscalar, vector, and axial vector mesons and their interactions containing
also the couplings of strongly interacting particles with electroweak gauge
bosons, is confronted with the ALEPH data on the decay
$\tau^-\to\pi^-\pi^-\pi^+\nu_\tau$ and BABAR and CMD data on the reaction
$e^+e^-\to\pi^+\pi^-\pi^+\pi^-$. It is shown that both the invariant mass
spectrum of final pions in $\tau$ decay calculated in the GHLS framework with
the single $a_1(1260)$ resonance and the cross section
$e^+e^-\to\pi^+\pi^-\pi^+\pi^-$ calculated in the above framework with the
single $\rho(770)$ resonance, disagree with the experimental data. The
modifications of GHLS model based on inclusion of two additional heavier axial
vector mesons $a_1^\prime$, $a_1^{\prime\prime}$ in the $\tau$ decay and the
vector mesons $\rho^\prime$, $\rho^{\prime\prime}$ in
$e^+e^-\to\pi^+\pi^-\pi^+\pi^-$ are shown to be necessary for the good
description of the above data.
|
[
{
"created": "Wed, 22 Sep 2010 12:41:49 GMT",
"version": "v1"
}
] |
2010-09-23
|
[
[
"Achasov",
"N. N.",
""
],
[
"Kozhevnikov",
"A. A.",
""
]
] |
Generalized Hidden Local Symmetry (GHLS) model as the chiral model of pseudoscalar, vector, and axial vector mesons and their interactions containing also the couplings of strongly interacting particles with electroweak gauge bosons, is confronted with the ALEPH data on the decay $\tau^-\to\pi^-\pi^-\pi^+\nu_\tau$ and BABAR and CMD data on the reaction $e^+e^-\to\pi^+\pi^-\pi^+\pi^-$. It is shown that both the invariant mass spectrum of final pions in $\tau$ decay calculated in the GHLS framework with the single $a_1(1260)$ resonance and the cross section $e^+e^-\to\pi^+\pi^-\pi^+\pi^-$ calculated in the above framework with the single $\rho(770)$ resonance, disagree with the experimental data. The modifications of GHLS model based on inclusion of two additional heavier axial vector mesons $a_1^\prime$, $a_1^{\prime\prime}$ in the $\tau$ decay and the vector mesons $\rho^\prime$, $\rho^{\prime\prime}$ in $e^+e^-\to\pi^+\pi^-\pi^+\pi^-$ are shown to be necessary for the good description of the above data.
|
hep-ph/0205081
|
Gennaro Corcella
|
Gennaro Corcella (MPI, Munich), Alexander D. Mitov (Rochester U.)
|
Top Decay and Bottom Fragmentation in NLO QCD
|
4 pages, 3 figures. Talk given at XXXVIIth Rencontres de Moriond, QCD
and Hadronic Interactions, 16-23 March 2002, Les Arcs, France
| null | null |
MPI-PhT/2002-18
|
hep-ph
| null |
We apply the method of perturbative fragmentation to study bottom
fragmentation in top decay. We present the energy spectrum of b-quarks and
b-flavoured hadrons in top decay
|
[
{
"created": "Wed, 8 May 2002 14:56:17 GMT",
"version": "v1"
},
{
"created": "Thu, 9 May 2002 13:20:33 GMT",
"version": "v2"
}
] |
2007-05-23
|
[
[
"Corcella",
"Gennaro",
"",
"MPI, Munich"
],
[
"Mitov",
"Alexander D.",
"",
"Rochester U."
]
] |
We apply the method of perturbative fragmentation to study bottom fragmentation in top decay. We present the energy spectrum of b-quarks and b-flavoured hadrons in top decay
|
hep-ph/9402205
|
Yongseok Oh
|
Yongseok Oh, Byung-Yoon Park and Dong-Pil Min
|
Heavy Baryons as Skyrmion with $1/m_Q$ Corrections
|
REVTeX, 26 pages, 3 figures included (pictex), SNUTP-93/80. (To
appear in Physical Review D)
|
Phys.Rev. D49 (1994) 4649-4658
|
10.1103/PhysRevD.49.4649
| null |
hep-ph
| null |
We take into account the $1/m_Q$ corrections upto $1/N_c$ order in the
heavy-meson-soliton bound state approach for heavy baryons. With these
corrections, the mass spectra of baryons with $c$-quark as well as of those
with $b$-quark are well reproduced. For charmed baryons, however, the
correction to the mass spectra amounts to about 300 MeV, which is not small
compared to the leading order binding energy, $\sim 800$ MeV.
|
[
{
"created": "Wed, 2 Feb 1994 04:27:58 GMT",
"version": "v1"
}
] |
2009-10-28
|
[
[
"Oh",
"Yongseok",
""
],
[
"Park",
"Byung-Yoon",
""
],
[
"Min",
"Dong-Pil",
""
]
] |
We take into account the $1/m_Q$ corrections upto $1/N_c$ order in the heavy-meson-soliton bound state approach for heavy baryons. With these corrections, the mass spectra of baryons with $c$-quark as well as of those with $b$-quark are well reproduced. For charmed baryons, however, the correction to the mass spectra amounts to about 300 MeV, which is not small compared to the leading order binding energy, $\sim 800$ MeV.
|
hep-ph/9608308
|
Michael Pluemacher
|
W. Buchmuller and M. Plumacher
|
Baryon Asymmetry and Neutrino Mixing
|
latex2e, 10 pages, 3 figures, uses epsfig
|
Phys.Lett. B389 (1996) 73-77
|
10.1016/S0370-2693(96)01232-4
|
DESY 96-158
|
hep-ph
| null |
In theories where $B-L$ is a spontaneously broken local symmetry, the
cosmological baryon asymmetry can be generated by the out-of-equilibrium decay
of heavy Majorana neutrinos. We study this mechanism assuming a similar pattern
of mixings and masses for leptons and quarks, as suggested by SO(10)
unification. This implies that $B-L$ is broken at the unification scale
$\Lambda_{\mbox{\scriptsize GUT}}\sim 10^{16}$ GeV, if $m_{\n_\m} \sim 3\cdot
10^{-3}$eV as preferred by the MSW explanation of the solar neutrino deficit.
The observed value of the baryon asymmetry, $n_B/s \sim 10^{-10}$, is then
obtained without any fine tuning of parameters.
|
[
{
"created": "Tue, 13 Aug 1996 12:02:57 GMT",
"version": "v1"
}
] |
2009-10-28
|
[
[
"Buchmuller",
"W.",
""
],
[
"Plumacher",
"M.",
""
]
] |
In theories where $B-L$ is a spontaneously broken local symmetry, the cosmological baryon asymmetry can be generated by the out-of-equilibrium decay of heavy Majorana neutrinos. We study this mechanism assuming a similar pattern of mixings and masses for leptons and quarks, as suggested by SO(10) unification. This implies that $B-L$ is broken at the unification scale $\Lambda_{\mbox{\scriptsize GUT}}\sim 10^{16}$ GeV, if $m_{\n_\m} \sim 3\cdot 10^{-3}$eV as preferred by the MSW explanation of the solar neutrino deficit. The observed value of the baryon asymmetry, $n_B/s \sim 10^{-10}$, is then obtained without any fine tuning of parameters.
|
hep-ph/0602158
|
Chao-Hsi Chang
|
Chao-Hsi Chang, Jiao-Kai Chen, Zhen-Yun Fang, Bing-Quan Hu, Xing-Gang
Wu
|
Fragmentation Function and Hadronic Production of the Heavy
Supersymmetric Hadrons
|
20 pages, 9 figures
|
Eur.Phys.J.C50:969-978,2007
|
10.1140/epjc/s10052-007-0244-4
| null |
hep-ph
| null |
The light top-squark $\sto$ may be the lightest squark and its lifetime may
be `long enough' in a kind of SUSY models which have not been ruled out yet
experimentally, so colorless `supersymmetric hadrons (superhadrons)' $(\sto
\bar{q})$ ($q$ is a quark except $t$-quark) may be formed as long as the light
top-squark $\sto$ can be produced. Fragmentation function of $\sto$ to heavy
`supersymmetric hadrons (superhadrons)' $(\sto \bar{Q})$ ($\bar{Q}=\bar{c}$ or
$\bar{b}$) and the hadronic production of the superhadrons are investigated
quantitatively. The fragmentation function is calculated precisely. Due to the
difference in spin of the SUSY component, the asymptotic behavior of the
fragmentation function is different from those of the existent ones. The
fragmentation function is also applied to compute the production of heavy
superhadrons at hadronic colliders Tevatron and LHC under the so-called
fragmentation approach. The resultant cross-section for the heavy superhadrons
is too small to observe at Tevatron, but great enough at LHC, even when all the
relevant parameters in the SUSY models are taken within the favored region for
the heavy superhadrons. The production of `light superhadrons' $(\sto \bar{q})$
($q=u, d, s$) is also roughly estimated. It is pointed out that the production
cross-sections of the light superhadrons $(\sto \bar{q})$ may be much greater
than those of the heavy superhadrons, so that even at Tevatron the light
superhadrons may be produced in great quantities.
|
[
{
"created": "Fri, 17 Feb 2006 08:50:50 GMT",
"version": "v1"
},
{
"created": "Tue, 21 Feb 2006 09:58:19 GMT",
"version": "v2"
},
{
"created": "Fri, 8 Jun 2007 03:30:05 GMT",
"version": "v3"
}
] |
2008-11-26
|
[
[
"Chang",
"Chao-Hsi",
""
],
[
"Chen",
"Jiao-Kai",
""
],
[
"Fang",
"Zhen-Yun",
""
],
[
"Hu",
"Bing-Quan",
""
],
[
"Wu",
"Xing-Gang",
""
]
] |
The light top-squark $\sto$ may be the lightest squark and its lifetime may be `long enough' in a kind of SUSY models which have not been ruled out yet experimentally, so colorless `supersymmetric hadrons (superhadrons)' $(\sto \bar{q})$ ($q$ is a quark except $t$-quark) may be formed as long as the light top-squark $\sto$ can be produced. Fragmentation function of $\sto$ to heavy `supersymmetric hadrons (superhadrons)' $(\sto \bar{Q})$ ($\bar{Q}=\bar{c}$ or $\bar{b}$) and the hadronic production of the superhadrons are investigated quantitatively. The fragmentation function is calculated precisely. Due to the difference in spin of the SUSY component, the asymptotic behavior of the fragmentation function is different from those of the existent ones. The fragmentation function is also applied to compute the production of heavy superhadrons at hadronic colliders Tevatron and LHC under the so-called fragmentation approach. The resultant cross-section for the heavy superhadrons is too small to observe at Tevatron, but great enough at LHC, even when all the relevant parameters in the SUSY models are taken within the favored region for the heavy superhadrons. The production of `light superhadrons' $(\sto \bar{q})$ ($q=u, d, s$) is also roughly estimated. It is pointed out that the production cross-sections of the light superhadrons $(\sto \bar{q})$ may be much greater than those of the heavy superhadrons, so that even at Tevatron the light superhadrons may be produced in great quantities.
|
1605.07453
|
Wei Chen
|
Hua-Xing Chen, Dan Zhou, Wei Chen, Xiang Liu, and Shi-Lin Zhu
|
Searching for hidden-charm baryonium signals in QCD sum rules
|
7 pages, 5 figures, 1 table. Accepted by Eur. Phys. J. C
|
Eur.Phys.J. C76 (2016) no.11, 602
|
10.1140/epjc/s10052-016-4459-0
| null |
hep-ph hep-ex hep-lat
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We give an explicit QCD sum rule investigation to hidden-charm baryonium
states with the quark content $u\bar u d\bar d c\bar c$, spin $J=0/1/2/3$, and
of both positive and negative parities. We systematically construct the
relevant local hidden-charm baryonium interpolating currents, which can
actually couple to various structures, including hidden-charm baryonium states,
charmonium states plus two pions, and hidden-charm tetraquark states plus one
pion, etc. We do not know which structure these currents couple to at the
beginning, but after sum rule analyses we can obtain some information. We find
some of them can couple to hidden-charm baryonium states, using which we
evaluate the masses of the lowest-lying hidden-charm baryonium states with
quantum numbers $J^P=2^-/3^-/0^+/1^+/2^+$ to be around 5.0 GeV. We suggest to
search for hidden-charm baryonium states, especially the one of $J=3^-$, in the
$D$-wave $J/\psi \pi \pi$ and $P$-wave $J/\psi \rho$ and $J/\psi \omega$
channels in this energy region.
|
[
{
"created": "Tue, 24 May 2016 13:42:37 GMT",
"version": "v1"
},
{
"created": "Fri, 4 Nov 2016 03:51:05 GMT",
"version": "v2"
}
] |
2016-11-10
|
[
[
"Chen",
"Hua-Xing",
""
],
[
"Zhou",
"Dan",
""
],
[
"Chen",
"Wei",
""
],
[
"Liu",
"Xiang",
""
],
[
"Zhu",
"Shi-Lin",
""
]
] |
We give an explicit QCD sum rule investigation to hidden-charm baryonium states with the quark content $u\bar u d\bar d c\bar c$, spin $J=0/1/2/3$, and of both positive and negative parities. We systematically construct the relevant local hidden-charm baryonium interpolating currents, which can actually couple to various structures, including hidden-charm baryonium states, charmonium states plus two pions, and hidden-charm tetraquark states plus one pion, etc. We do not know which structure these currents couple to at the beginning, but after sum rule analyses we can obtain some information. We find some of them can couple to hidden-charm baryonium states, using which we evaluate the masses of the lowest-lying hidden-charm baryonium states with quantum numbers $J^P=2^-/3^-/0^+/1^+/2^+$ to be around 5.0 GeV. We suggest to search for hidden-charm baryonium states, especially the one of $J=3^-$, in the $D$-wave $J/\psi \pi \pi$ and $P$-wave $J/\psi \rho$ and $J/\psi \omega$ channels in this energy region.
|
0810.4075
|
Ivanov Dmitry
|
D.Yu. Ivanov, V.M. Braun and A. Sch\"afer
|
Diffractive jets production in pp-collisions
|
Presented at International Workshop on Diffraction in High-Energy
Physics, La Londe-les-Maures, France, September 9 - 14, 2008
| null |
10.1063/1.3122210
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We consider the exclusive diffractive dissociation of a proton into three
jets with large transverse momenta in the double-logarithmic approximation of
perturbative QCD. This process is sensitive to the proton unintegrated gluon
distribution at small x and to the proton light-cone distribution amplitudes.
According to our estimates, an observation of such processes in the early runs
at LHC is feasible for jet transverse momenta of the order of 5 GeV.
|
[
{
"created": "Wed, 22 Oct 2008 14:29:44 GMT",
"version": "v1"
}
] |
2009-11-13
|
[
[
"Ivanov",
"D. Yu.",
""
],
[
"Braun",
"V. M.",
""
],
[
"Schäfer",
"A.",
""
]
] |
We consider the exclusive diffractive dissociation of a proton into three jets with large transverse momenta in the double-logarithmic approximation of perturbative QCD. This process is sensitive to the proton unintegrated gluon distribution at small x and to the proton light-cone distribution amplitudes. According to our estimates, an observation of such processes in the early runs at LHC is feasible for jet transverse momenta of the order of 5 GeV.
|
hep-ph/9910382
|
Enrique Ruiz Arriola
|
E. Ruiz Arriola
|
On the Structure Functions of Mesons and Baryons in a Chiral Quark Model
|
(LaTeX) 12 pages, 1 figure, Talk given at the Mini-Workshop "Hadrons
as Solitons", Bled (Slovenia) July 9-17, 1999
| null | null |
UG-DFM-3/99
|
hep-ph
| null |
This research summarizes work done by myself (Nucl.Phys.{\bf A641}
(1998)461), or in collaboration with R. M. Davidson (Phys.Lett.{\bf
B348}(1995)163) and H. Weigel and L. Gamberg (Nucl.Phys.{\bf B560}(1999)xx). I
will discuss several topics related with the computation of structure functions
in the quark model in general and its perturbative evolution. In particular, I
address this topic in the Nambu-Jona-Lasinio model of hadrons, where the
nucleon is constructed as a soliton. I show that the handling of the
regularization procedure is crucial in order to obtain exact scaling in the
Bjorken limit and fulfillment of sum rules. I also include some problems
concerning the general validity of quark model calculations.
|
[
{
"created": "Mon, 18 Oct 1999 12:23:08 GMT",
"version": "v1"
}
] |
2007-05-23
|
[
[
"Arriola",
"E. Ruiz",
""
]
] |
This research summarizes work done by myself (Nucl.Phys.{\bf A641} (1998)461), or in collaboration with R. M. Davidson (Phys.Lett.{\bf B348}(1995)163) and H. Weigel and L. Gamberg (Nucl.Phys.{\bf B560}(1999)xx). I will discuss several topics related with the computation of structure functions in the quark model in general and its perturbative evolution. In particular, I address this topic in the Nambu-Jona-Lasinio model of hadrons, where the nucleon is constructed as a soliton. I show that the handling of the regularization procedure is crucial in order to obtain exact scaling in the Bjorken limit and fulfillment of sum rules. I also include some problems concerning the general validity of quark model calculations.
|
hep-ph/9905576
|
Sreerup Raychaudhuri fc phy
|
Sreerup Raychaudhuri (IIT, Kanpur)
|
Trilinear R-Parity Violation: Theory to Experiment
|
20 pages, LaTeX, 6 postscript figures; Expanded version of an Invited
Talk delivered at the 13th Topical Conference on Hadron Collider Physics,
Mumbai, January 1999
| null | null |
IITK-PHY-99-51
|
hep-ph
| null |
Supersymmetric models without conservation of R-parity are reviewed and
low-energy constraints on the extra trilinear couplings listed. Current
searches at the LEP, Tevatron and HERA colliders are then summed up. Prospects
for further study, especially at future colliders, are briefly touched upon.
|
[
{
"created": "Mon, 31 May 1999 20:24:02 GMT",
"version": "v1"
}
] |
2007-05-23
|
[
[
"Raychaudhuri",
"Sreerup",
"",
"IIT, Kanpur"
]
] |
Supersymmetric models without conservation of R-parity are reviewed and low-energy constraints on the extra trilinear couplings listed. Current searches at the LEP, Tevatron and HERA colliders are then summed up. Prospects for further study, especially at future colliders, are briefly touched upon.
|
1810.03332
|
Bin Yang
|
Bin Yang, Lu Meng and Shi-Lin Zhu
|
Hadronic Molecular States Composed of Spin-$3\over 2$ Singly Charmed
Baryons
|
18 pages, 7 figures
| null |
10.1140/epja/i2019-12686-5
| null |
hep-ph hep-ex hep-lat nucl-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We investigate the possible deuteron-like molecules composed of a pair of
charmed spin-$\frac{3}{2}$ baryons, or one charmed baryon and one charmed
antibaryon within the one-boson-exchange (OBE) model. For the spin singlet and
triplet systems, we consider the couple channel effect between systems with
different orbital angular momentum. Most of the systems have binding solutions.
The couple channel effect plays a significant role in the formation of some
loosely bound states. The possible molecular states of $\Omega_c^*\Omega_c^*$
and $\Omega_c^*\bar{\Omega}_c^*$ might be stable once produced.
|
[
{
"created": "Mon, 8 Oct 2018 09:02:46 GMT",
"version": "v1"
},
{
"created": "Wed, 13 Feb 2019 05:48:14 GMT",
"version": "v2"
}
] |
2019-03-27
|
[
[
"Yang",
"Bin",
""
],
[
"Meng",
"Lu",
""
],
[
"Zhu",
"Shi-Lin",
""
]
] |
We investigate the possible deuteron-like molecules composed of a pair of charmed spin-$\frac{3}{2}$ baryons, or one charmed baryon and one charmed antibaryon within the one-boson-exchange (OBE) model. For the spin singlet and triplet systems, we consider the couple channel effect between systems with different orbital angular momentum. Most of the systems have binding solutions. The couple channel effect plays a significant role in the formation of some loosely bound states. The possible molecular states of $\Omega_c^*\Omega_c^*$ and $\Omega_c^*\bar{\Omega}_c^*$ might be stable once produced.
|
1506.04612
|
Marco Frasca
|
Marco Frasca
|
Running mass of the gluon propagator in the Landau gauge
|
15 pages, 3 figures. Added some references and exposed, in the
introduction, the role of the scaling solution
| null | null | null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Gluon propagator in the infrared limit, computed in the Landau gauge, can be
cast into an universal form with a running mass for the gluon. In this way we
are able to show that all the proposals appeared so far in literature are
equivalent and describe the same physics. In this way, it appears essential to
reach a general agreement about the interpretation of such results. We discuss
the points that make difficult to agree on a similar view about this.
|
[
{
"created": "Mon, 15 Jun 2015 14:30:29 GMT",
"version": "v1"
},
{
"created": "Wed, 17 Jun 2015 07:52:19 GMT",
"version": "v2"
}
] |
2015-06-18
|
[
[
"Frasca",
"Marco",
""
]
] |
Gluon propagator in the infrared limit, computed in the Landau gauge, can be cast into an universal form with a running mass for the gluon. In this way we are able to show that all the proposals appeared so far in literature are equivalent and describe the same physics. In this way, it appears essential to reach a general agreement about the interpretation of such results. We discuss the points that make difficult to agree on a similar view about this.
|
1709.10370
|
Colferai Dimitri Dr
|
Dimitri Colferai, Federico Deganutti and Alessandro Niccoli
|
Improved theoretical description of Mueller-Navelet jets at LHC
|
8 pages, 6 figures, talk presented at the Low x workshop, June 13-18
2017, Bari, Italy
| null | null | null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We present a method for improving the phenomenological description of
Mueller-Navelet jets at LHC, which is based on matching the BFKL resummation
with fixed order calculations. We point out the need of a consistent
identification of jets between experimental measurements and theoretical
descriptions. We hope as well to motivate an extensive analysis of MN jets at
LHC in run 2.
|
[
{
"created": "Fri, 29 Sep 2017 12:37:25 GMT",
"version": "v1"
}
] |
2017-10-02
|
[
[
"Colferai",
"Dimitri",
""
],
[
"Deganutti",
"Federico",
""
],
[
"Niccoli",
"Alessandro",
""
]
] |
We present a method for improving the phenomenological description of Mueller-Navelet jets at LHC, which is based on matching the BFKL resummation with fixed order calculations. We point out the need of a consistent identification of jets between experimental measurements and theoretical descriptions. We hope as well to motivate an extensive analysis of MN jets at LHC in run 2.
|
1710.01930
|
Jan Maelger
|
J. Maelger, U. Reinosa, J. Serreau
|
A perturbative study of the QCD phase diagram for heavy quarks at
nonzero chemical potential: two-loop corrections
|
26 pages, 16 figures
|
Phys. Rev. D 97, 074027 (2018)
|
10.1103/PhysRevD.97.074027
| null |
hep-ph hep-lat hep-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We extend a previous investigation of the QCD phase diagram with heavy quarks
in the context of background field methods by including the two-loop
corrections to the background field effective potential. The nonperturbative
dynamics in the pure-gauge sector is modeled by a phenomenological gluon mass
term in the Landau-DeWitt gauge-fixed action, which results in an improved
perturbative expansion. We investigate the phase diagram at nonzero temperature
and (real or imaginary) chemical potential. Two-loop corrections yield an
improved agreement with lattice data as compared to the leading-order results.
We also compare with the results of nonperturbative approaches. We further
study the equation of state as well as the thermodynamic stability of the
system at two-loop order. Finally, we show, using simple thermodynamic
arguments, that the behavior of the Polyakov loops as functions of the chemical
potential complies with their interpretation in terms of quark and anti-quark
free energies.
|
[
{
"created": "Thu, 5 Oct 2017 09:16:59 GMT",
"version": "v1"
}
] |
2018-05-02
|
[
[
"Maelger",
"J.",
""
],
[
"Reinosa",
"U.",
""
],
[
"Serreau",
"J.",
""
]
] |
We extend a previous investigation of the QCD phase diagram with heavy quarks in the context of background field methods by including the two-loop corrections to the background field effective potential. The nonperturbative dynamics in the pure-gauge sector is modeled by a phenomenological gluon mass term in the Landau-DeWitt gauge-fixed action, which results in an improved perturbative expansion. We investigate the phase diagram at nonzero temperature and (real or imaginary) chemical potential. Two-loop corrections yield an improved agreement with lattice data as compared to the leading-order results. We also compare with the results of nonperturbative approaches. We further study the equation of state as well as the thermodynamic stability of the system at two-loop order. Finally, we show, using simple thermodynamic arguments, that the behavior of the Polyakov loops as functions of the chemical potential complies with their interpretation in terms of quark and anti-quark free energies.
|
1912.04329
|
Kanchan Khemchandani
|
K. P. Khemchandani, A. Martinez Torres, J. A. Oller
|
Hyperon resonances and meson-baryon interactions in isospin 1
|
Contribution to the Hadron 2019 conference proceedings
| null | null | null |
hep-ph nucl-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
In this work we extend our formalism to study meson-baryon interactions by
including $s$- and $u$-channel diagrams for pseudoscalar-baryon systems. We
study the coupled systems with strangeness $-1$ and focus on studying the
isospin-1 resonance(s), especially in the energy region around 1400 MeV. By
constraining the model parameters to fit the cross section data available on
several processes involving relevant channels, we find resonances in the
isoscalar as well as the isovector sector in the energy region around 1400 MeV.
|
[
{
"created": "Mon, 9 Dec 2019 19:17:02 GMT",
"version": "v1"
},
{
"created": "Wed, 19 Feb 2020 21:11:10 GMT",
"version": "v2"
}
] |
2020-02-21
|
[
[
"Khemchandani",
"K. P.",
""
],
[
"Torres",
"A. Martinez",
""
],
[
"Oller",
"J. A.",
""
]
] |
In this work we extend our formalism to study meson-baryon interactions by including $s$- and $u$-channel diagrams for pseudoscalar-baryon systems. We study the coupled systems with strangeness $-1$ and focus on studying the isospin-1 resonance(s), especially in the energy region around 1400 MeV. By constraining the model parameters to fit the cross section data available on several processes involving relevant channels, we find resonances in the isoscalar as well as the isovector sector in the energy region around 1400 MeV.
|
hep-ph/9510244
|
Sergio Lupia
|
Sergio Lupia (Max-Planck-Institut fuer Physik, Muenchen)
|
Moment analysis of energy spectra and the effect of running coupling
|
12 pages, LaTeX, uses epsfig.sty, 3 figures appended as uuencoded
Z-compressed tarred PS-files, to be published in Proc. of XXVth International
Symposium on Multiparticle Dynamics, Stara Lesna, Slovakia, September 12-16,
1995
| null | null |
MPI-PhT/95-94
|
hep-ph
| null |
Single particle inclusive energy spectra in $e^+e^-$ annihilation are
analyzed in terms of moments. By assuming Local Parton Hadron Duality (LPHD),
experimental data in a wide c.m. energy range from 3 GeV up to LEP energy are
compared to the theoretical predictions of Modified Leading Log Approximation
(MLLA) of QCD with and without taking into account the running of $\alpha_s$.
MLLA with running coupling (Limiting Spectrum) is found to reproduce
experimental results very well, while the model with fixed coupling is
inconsistent with data. Rescaled cumulants are shown to be sensitive to the
running of $\alpha_s$ in the asymptotic regime, while the Lorentz-invariant
distribution, $E dn/d^3p$, points out this effect at very small energy $E$ of
few hundreds MeV. These results give a direct evidence of the running of the
QCD coupling in inclusive energy spectra and lend further support to the LPHD
picture.
|
[
{
"created": "Fri, 6 Oct 1995 15:37:20 GMT",
"version": "v1"
}
] |
2007-05-23
|
[
[
"Lupia",
"Sergio",
"",
"Max-Planck-Institut fuer Physik, Muenchen"
]
] |
Single particle inclusive energy spectra in $e^+e^-$ annihilation are analyzed in terms of moments. By assuming Local Parton Hadron Duality (LPHD), experimental data in a wide c.m. energy range from 3 GeV up to LEP energy are compared to the theoretical predictions of Modified Leading Log Approximation (MLLA) of QCD with and without taking into account the running of $\alpha_s$. MLLA with running coupling (Limiting Spectrum) is found to reproduce experimental results very well, while the model with fixed coupling is inconsistent with data. Rescaled cumulants are shown to be sensitive to the running of $\alpha_s$ in the asymptotic regime, while the Lorentz-invariant distribution, $E dn/d^3p$, points out this effect at very small energy $E$ of few hundreds MeV. These results give a direct evidence of the running of the QCD coupling in inclusive energy spectra and lend further support to the LPHD picture.
|
1907.06735
|
Le Tho Hue
|
H. T. Hung, T. T. Hong, H. H. Phuong, H. L. T. Mai, L. T.Hue
|
Neutral Higgs decays $H \rightarrow Z \gamma,\gamma\gamma$ in 3-3-1
models
|
Version accepted for publication in PRD
|
Phys. Rev. D 100, 075014 (2019)
|
10.1103/PhysRevD.100.075014
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
The significance of new physics appearing in the loop-induced decays of
neutral Higgs bosons into pairs of dibosons $\gamma\gamma$ and $Z\gamma$ will
be discussed in the framework of the 3-3-1 models based on a recent
work~\cite{Okada:2016whh}, where the Higgs sector becomes effectively the same
as that in the two Higgs doublet models (2HDM) after the first symmetry
breaking from $SU(3)_L$ scale into the electroweak scale. For large $SU(3)_L$
scale $v_3\simeq10$ TeV, dominant one-loop contributions to the two decay
amplitudes arise from only the single charged Higgs boson predicted by the
2HDM, leading to that experimental constraint on the signal strength
$\mu^{331}_{\gamma\gamma}$ of the Standard Model-like Higgs boson decay
$h\rightarrow \gamma\gamma$ will result in a strict upper bound on the signal
strength $\mu^{331}_{Z\gamma}$ of the decay $h\rightarrow\, Z\gamma$. For a
particular model with lower $v_3$ around 3 TeV, contributions from heavy
charged gauge and Higgs bosons may have the same order, therefore may give
strong destructive or constructive correlations. As a by-product, a deviation
from the SM prediction $|\mu^{331}_{\gamma\gamma}-1| \le 0.04$ still allows
$|\mu^{331}_{Z\gamma}-1|$ to reach values near 0.1. We also show that there
exists an $CP$-even neutral Higgs boson $h^0_3$ predicted by the 3-3-1 models,
but beyond the 2HDM, has an interesting property that the branching ratio
Br$(h^0_3\rightarrow \gamma\gamma)$ is very sensitive to the parameter $\beta$
used to distinguish different 3-3-1 models.
|
[
{
"created": "Mon, 15 Jul 2019 20:28:31 GMT",
"version": "v1"
},
{
"created": "Mon, 7 Oct 2019 08:43:52 GMT",
"version": "v2"
}
] |
2019-10-16
|
[
[
"Hung",
"H. T.",
""
],
[
"Hong",
"T. T.",
""
],
[
"Phuong",
"H. H.",
""
],
[
"Mai",
"H. L. T.",
""
],
[
"Hue",
"L. T.",
""
]
] |
The significance of new physics appearing in the loop-induced decays of neutral Higgs bosons into pairs of dibosons $\gamma\gamma$ and $Z\gamma$ will be discussed in the framework of the 3-3-1 models based on a recent work~\cite{Okada:2016whh}, where the Higgs sector becomes effectively the same as that in the two Higgs doublet models (2HDM) after the first symmetry breaking from $SU(3)_L$ scale into the electroweak scale. For large $SU(3)_L$ scale $v_3\simeq10$ TeV, dominant one-loop contributions to the two decay amplitudes arise from only the single charged Higgs boson predicted by the 2HDM, leading to that experimental constraint on the signal strength $\mu^{331}_{\gamma\gamma}$ of the Standard Model-like Higgs boson decay $h\rightarrow \gamma\gamma$ will result in a strict upper bound on the signal strength $\mu^{331}_{Z\gamma}$ of the decay $h\rightarrow\, Z\gamma$. For a particular model with lower $v_3$ around 3 TeV, contributions from heavy charged gauge and Higgs bosons may have the same order, therefore may give strong destructive or constructive correlations. As a by-product, a deviation from the SM prediction $|\mu^{331}_{\gamma\gamma}-1| \le 0.04$ still allows $|\mu^{331}_{Z\gamma}-1|$ to reach values near 0.1. We also show that there exists an $CP$-even neutral Higgs boson $h^0_3$ predicted by the 3-3-1 models, but beyond the 2HDM, has an interesting property that the branching ratio Br$(h^0_3\rightarrow \gamma\gamma)$ is very sensitive to the parameter $\beta$ used to distinguish different 3-3-1 models.
|
hep-ph/0610067
|
T. Becher
|
Thomas Becher and Matthias Neubert
|
Analysis of Br(B-->X_s gamma) at NNLO with a Cut on Photon Energy
|
4 pages, 1 figure
|
Phys.Rev.Lett.98:022003,2007
|
10.1103/PhysRevLett.98.022003
|
CLNS 06/1979, FERMILAB-PUB-06-364-T
|
hep-ph
| null |
By combining a recent estimate of the total B-->X_s gamma branching fraction
at O(alpha_s^2) with a detailed analysis of the effects of a cut E_gamma>1.6GeV
on photon energy, a prediction for the partial B-->X_s gamma branching fraction
at next-to-next-to-leading order in renormalization-group improved perturbation
theory is obtained, in which contributions from all relevant scales are
properly factorized. The result Br(B-->X_s gamma)=(2.98+-0.26)x10^{-4} is about
1.4 sigma lower than the experimental world average. This opens a window for
significant New Physics contributions in rare radiative B decays.
|
[
{
"created": "Thu, 5 Oct 2006 19:08:49 GMT",
"version": "v1"
}
] |
2008-11-26
|
[
[
"Becher",
"Thomas",
""
],
[
"Neubert",
"Matthias",
""
]
] |
By combining a recent estimate of the total B-->X_s gamma branching fraction at O(alpha_s^2) with a detailed analysis of the effects of a cut E_gamma>1.6GeV on photon energy, a prediction for the partial B-->X_s gamma branching fraction at next-to-next-to-leading order in renormalization-group improved perturbation theory is obtained, in which contributions from all relevant scales are properly factorized. The result Br(B-->X_s gamma)=(2.98+-0.26)x10^{-4} is about 1.4 sigma lower than the experimental world average. This opens a window for significant New Physics contributions in rare radiative B decays.
|
0706.2377
|
Alejandro Ayala
|
Alejandro Ayala (ICN-UNAM), J. Magnin (CBPF), Luis Manuel Montano
(CINVESTAV) and Eduardo Rojas (ICN-UNAM)
|
Collisional parton energy loss in a finite size QCD medium revisited:
Off mass-shell effects
|
9 pages, 4 figures. Enlarged discussion. References added. Version to
appear in Phys. Rev. C
|
Phys.Rev.C77:044904,2008
|
10.1103/PhysRevC.77.044904
| null |
hep-ph
| null |
We study the collisional energy loss mechanism for particles produced off
mass-shell in a finite size QCD medium. The off mass-shell effects introduced
are to consider particles produced in wave packets instead of plane waves and
the length scale associated to an in-medium particles' life-time. We show that
these effects reduce the energy loss as compared to the case when the particles
are described as freely propagating from the source. The reduction of the
energy loss is stronger as this scale becomes of the order or smaller than the
medium size. We discuss possible consequences of the result on the description
of the energy loss process in the parton recombination scenario.
|
[
{
"created": "Fri, 15 Jun 2007 22:08:12 GMT",
"version": "v1"
},
{
"created": "Tue, 25 Mar 2008 18:41:52 GMT",
"version": "v2"
}
] |
2008-11-26
|
[
[
"Ayala",
"Alejandro",
"",
"ICN-UNAM"
],
[
"Magnin",
"J.",
"",
"CBPF"
],
[
"Montano",
"Luis Manuel",
"",
"CINVESTAV"
],
[
"Rojas",
"Eduardo",
"",
"ICN-UNAM"
]
] |
We study the collisional energy loss mechanism for particles produced off mass-shell in a finite size QCD medium. The off mass-shell effects introduced are to consider particles produced in wave packets instead of plane waves and the length scale associated to an in-medium particles' life-time. We show that these effects reduce the energy loss as compared to the case when the particles are described as freely propagating from the source. The reduction of the energy loss is stronger as this scale becomes of the order or smaller than the medium size. We discuss possible consequences of the result on the description of the energy loss process in the parton recombination scenario.
|
1306.0695
|
Christian Hambrock
|
Christian Hambrock
|
Exotic Heavy Quark Spectroscopy - Theory Interpretation vs Data
|
Proceedings, Beauty 2013, Bologna
| null | null | null |
hep-ph hep-ex
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
An overview over recent spectroscopy results in comparison with data is
given. We focus on the exotica Z_b(10610), Z_b(10650) and Y_b(10890) in the
bottom sector and discuss a possible connection to the exotica in the charm
sector, namely to the resonances Y_c(4260) and Z_c(3900). Furthermore, future
prospects for the determination of the nature of Y_b(10890) are outlined.
|
[
{
"created": "Tue, 4 Jun 2013 08:04:54 GMT",
"version": "v1"
}
] |
2013-06-05
|
[
[
"Hambrock",
"Christian",
""
]
] |
An overview over recent spectroscopy results in comparison with data is given. We focus on the exotica Z_b(10610), Z_b(10650) and Y_b(10890) in the bottom sector and discuss a possible connection to the exotica in the charm sector, namely to the resonances Y_c(4260) and Z_c(3900). Furthermore, future prospects for the determination of the nature of Y_b(10890) are outlined.
|
1310.2608
|
Haipeng An
|
Haipeng An, Yue Zhang
|
Baryogenesis Once More, Inside LHC
|
References added, new acknowledgement added, some paragraphs
reorganized for conciseness
| null | null |
CALT 68-2863
|
hep-ph astro-ph.CO hep-ex
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We investigate the feasibility of directly detecting a generation mechanism
of the cosmic baryon asymmetry, by repeating the same particle physics process
inside the LHC. We propose a framework with R-parity and CP violating squark
decays responsible for baryogenesis, which can be embedded in supersymmetric
models and is partly motivated by naturalness. We argue that the baryon number
generation here is closely related to lepton charge asymmetry on the resonance.
We emphasize the importance of the single charged lepton plus multijet channel
in the absence of significant missing energy in search of such a scenario.
|
[
{
"created": "Wed, 9 Oct 2013 20:00:01 GMT",
"version": "v1"
},
{
"created": "Thu, 24 Oct 2013 05:19:50 GMT",
"version": "v2"
}
] |
2013-10-25
|
[
[
"An",
"Haipeng",
""
],
[
"Zhang",
"Yue",
""
]
] |
We investigate the feasibility of directly detecting a generation mechanism of the cosmic baryon asymmetry, by repeating the same particle physics process inside the LHC. We propose a framework with R-parity and CP violating squark decays responsible for baryogenesis, which can be embedded in supersymmetric models and is partly motivated by naturalness. We argue that the baryon number generation here is closely related to lepton charge asymmetry on the resonance. We emphasize the importance of the single charged lepton plus multijet channel in the absence of significant missing energy in search of such a scenario.
|
1312.1627
|
Tiziano Peraro
|
Hans van Deurzen, Gionata Luisoni, Pierpaolo Mastrolia, Edoardo
Mirabella, Giovanni Ossola, Tiziano Peraro, Ulrich Schubert
|
Multi-loop Integrand Reduction via Multivariate Polynomial Division
|
Presented at the conferences: EPSHEP 2013, Matter to the Deepest
2013, and RADCOR 2013
| null | null | null |
hep-ph hep-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We present recent developments on the topic of the integrand reduction of
scattering amplitudes. Integrand-level methods allow to express an amplitude as
a linear combination of Master Integrals, by performing operations on the
corresponding integrands. This approach has already been successfully applied
and automated at one loop, and recently extended to higher loops. We describe a
coherent framework based on simple concepts of algebraic geometry, such as
multivariate polynomial division, which can be used in order to obtain the
integrand decomposition of any amplitude at any loop order. In the one-loop
case, we discuss an improved reduction algorithm, based on the application of
the Laurent series expansion to the integrands, which has been implemented in
the semi-numerical library Ninja. At two loops, we present the reduction of
five-point amplitudes in N=4 SYM, with a unitarity-based construction of the
integrand. We also describe the multi-loop divide-and-conquer approach, which
can always be used to find the integrand decomposition of any Feynman graph,
regardless of the form and the complexity of the integrand, with purely
algebraic operations.
|
[
{
"created": "Thu, 5 Dec 2013 17:42:43 GMT",
"version": "v1"
}
] |
2013-12-06
|
[
[
"van Deurzen",
"Hans",
""
],
[
"Luisoni",
"Gionata",
""
],
[
"Mastrolia",
"Pierpaolo",
""
],
[
"Mirabella",
"Edoardo",
""
],
[
"Ossola",
"Giovanni",
""
],
[
"Peraro",
"Tiziano",
""
],
[
"Schubert",
"Ulrich",
""
]
] |
We present recent developments on the topic of the integrand reduction of scattering amplitudes. Integrand-level methods allow to express an amplitude as a linear combination of Master Integrals, by performing operations on the corresponding integrands. This approach has already been successfully applied and automated at one loop, and recently extended to higher loops. We describe a coherent framework based on simple concepts of algebraic geometry, such as multivariate polynomial division, which can be used in order to obtain the integrand decomposition of any amplitude at any loop order. In the one-loop case, we discuss an improved reduction algorithm, based on the application of the Laurent series expansion to the integrands, which has been implemented in the semi-numerical library Ninja. At two loops, we present the reduction of five-point amplitudes in N=4 SYM, with a unitarity-based construction of the integrand. We also describe the multi-loop divide-and-conquer approach, which can always be used to find the integrand decomposition of any Feynman graph, regardless of the form and the complexity of the integrand, with purely algebraic operations.
|
1508.03172
|
Carlo Giunti Dr.
|
C. Giunti and E. M. Zavanin
|
Appearance-Disappearance Relation in 3+$N_{s}$ Short-Baseline Neutrino
Oscillations
|
6 pages; final version to be published in Mod. Phys. Lett. A
| null |
10.1142/S0217732316500036
| null |
hep-ph astro-ph.CO hep-ex
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We derive the relation between the amplitudes of short-baseline appearance
and disappearance oscillations in 3+$N_{s}$ neutrino mixing schemes which is
the origin of the appearance-disappearance tension that is found from the
analysis of the existing data in any 3+$N_{s}$ neutrino mixing scheme. We
illustrate the power of the relation to reveal the appearance-disappearance
tension in the cases of 3+1 and 3+2 mixing using the results of global fits of
short-baseline neutrino oscillation data.
|
[
{
"created": "Thu, 13 Aug 2015 11:06:52 GMT",
"version": "v1"
},
{
"created": "Mon, 14 Dec 2015 16:28:01 GMT",
"version": "v2"
}
] |
2016-01-20
|
[
[
"Giunti",
"C.",
""
],
[
"Zavanin",
"E. M.",
""
]
] |
We derive the relation between the amplitudes of short-baseline appearance and disappearance oscillations in 3+$N_{s}$ neutrino mixing schemes which is the origin of the appearance-disappearance tension that is found from the analysis of the existing data in any 3+$N_{s}$ neutrino mixing scheme. We illustrate the power of the relation to reveal the appearance-disappearance tension in the cases of 3+1 and 3+2 mixing using the results of global fits of short-baseline neutrino oscillation data.
|
hep-ph/0301135
|
Patricia Ball
|
Patricia Ball and Emi Kou
|
B->gamma e nu Transitions from QCD Sum Rules
|
13 pages, 5 figures
|
JHEP 0304 (2003) 029
|
10.1088/1126-6708/2003/04/029
|
IPPP/02/72
|
hep-ph
| null |
B->gamma e nu transitions have recently been studied in the framework of QCD
factorization. The attractiveness of this channel for such an analysis lies in
the fact that, at least in the heavy quark limit, the only hadron involved is
the B meson itself, so one expects a very simple description of the form factor
in terms of a convolution of the B meson distribution amplitude with a
perturbative kernel. This description, however, does not include contributions
suppressed by powers of the b quark mass. In this letter, we calculate
corrections to the factorized expression which are induced by the ``soft''
hadronic component of the photon. We demonstrate that the power-suppression of
these terms is numerically not effective for physical values of the $b$ quark
mass and that they increase the form factor by about 30% at zero momentum
transfer. We also derive a sum rule for lambda_B, the first negative moment of
the B meson distribution amplitude, and find lambda_B = 0.6 GeV (to leading
order in QCD).
|
[
{
"created": "Fri, 17 Jan 2003 13:56:06 GMT",
"version": "v1"
}
] |
2009-11-10
|
[
[
"Ball",
"Patricia",
""
],
[
"Kou",
"Emi",
""
]
] |
B->gamma e nu transitions have recently been studied in the framework of QCD factorization. The attractiveness of this channel for such an analysis lies in the fact that, at least in the heavy quark limit, the only hadron involved is the B meson itself, so one expects a very simple description of the form factor in terms of a convolution of the B meson distribution amplitude with a perturbative kernel. This description, however, does not include contributions suppressed by powers of the b quark mass. In this letter, we calculate corrections to the factorized expression which are induced by the ``soft'' hadronic component of the photon. We demonstrate that the power-suppression of these terms is numerically not effective for physical values of the $b$ quark mass and that they increase the form factor by about 30% at zero momentum transfer. We also derive a sum rule for lambda_B, the first negative moment of the B meson distribution amplitude, and find lambda_B = 0.6 GeV (to leading order in QCD).
|
1808.05429
|
Fernand M Renard
|
Fernand M. Renard
|
Further tests of special interactions of massive particles from the Z
polarization rate in $e^+e^-\to Zt\bar t$ and in $e^+e^-\to ZW^+W^-$
|
10 pages, 4 figures
| null | null | null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We propose further tests of the occurence of scale dependent heavy particle
masses (Z,W,t) and of strong final state interactions by comparing Z
longitudinal polarization rates in different kinematical distributions of the
$e^+e^-\to Zt\bar t$ and in $e^+e^-\to ZW^+W^-$ processes.
|
[
{
"created": "Thu, 16 Aug 2018 11:46:22 GMT",
"version": "v1"
}
] |
2018-08-17
|
[
[
"Renard",
"Fernand M.",
""
]
] |
We propose further tests of the occurence of scale dependent heavy particle masses (Z,W,t) and of strong final state interactions by comparing Z longitudinal polarization rates in different kinematical distributions of the $e^+e^-\to Zt\bar t$ and in $e^+e^-\to ZW^+W^-$ processes.
|
2102.05048
|
William J. Torres Bobadilla Dr.
|
William J. Torres Bobadilla
|
Loop-tree duality from vertices and edges
|
26 pages, 3 figures. v2: added all loop causal representation +
corrected a few typos. v3: references added; matches published version
| null |
10.1007/JHEP04(2021)183
|
MPP-2021-14
|
hep-ph hep-th
|
http://creativecommons.org/licenses/by/4.0/
|
The causal representation of multi-loop scattering amplitudes, obtained from
the application of the loop-tree duality formalism, comprehensively elucidates,
at integrand level, the behaviour of only physical singularities. This
representation is found to manifest compact expressions for multi-loop
topologies that have the same number of \textit{vertices}. Interestingly,
integrands considered in former studies, with up-to six vertices and $L$
internal lines, display the same structure of up-to four-loop ones. The former
is an insight that there should be a correspondence between vertices and the
collection of internal lines, \textit{edges}, that characterise a multi-loop
topology. By virtue of this relation, in this paper, we embrace an approach to
properly classify multi-loop topologies according to vertices and edges.
Differently from former studies, we consider the most general topologies, by
connecting vertices and edges in all possible ways. Likewise, we provide a
procedure to generate causal representation of multi-loop topologies by
considering the structure of causal propagators. Explicit causal
representations of loop topologies with up-to nine vertices are provided.
|
[
{
"created": "Tue, 9 Feb 2021 19:00:00 GMT",
"version": "v1"
},
{
"created": "Mon, 15 Feb 2021 06:37:45 GMT",
"version": "v2"
},
{
"created": "Tue, 22 Jun 2021 16:12:38 GMT",
"version": "v3"
}
] |
2021-06-23
|
[
[
"Bobadilla",
"William J. Torres",
""
]
] |
The causal representation of multi-loop scattering amplitudes, obtained from the application of the loop-tree duality formalism, comprehensively elucidates, at integrand level, the behaviour of only physical singularities. This representation is found to manifest compact expressions for multi-loop topologies that have the same number of \textit{vertices}. Interestingly, integrands considered in former studies, with up-to six vertices and $L$ internal lines, display the same structure of up-to four-loop ones. The former is an insight that there should be a correspondence between vertices and the collection of internal lines, \textit{edges}, that characterise a multi-loop topology. By virtue of this relation, in this paper, we embrace an approach to properly classify multi-loop topologies according to vertices and edges. Differently from former studies, we consider the most general topologies, by connecting vertices and edges in all possible ways. Likewise, we provide a procedure to generate causal representation of multi-loop topologies by considering the structure of causal propagators. Explicit causal representations of loop topologies with up-to nine vertices are provided.
|
hep-ph/9407363
| null |
V.A. Litvin, S.R. Slabospitsky
|
LEP $e^{+}\,e^{-}\,\rightarrow\,\mu^{+}\, \mu^{-}\,\gamma\,\gamma$
events and their consequences at future $e^+e^-$ colliders
|
Latex, 10 pages, Preprint IHEP 94-22, Protvino, 1994
|
Int.J.Mod.Phys.A10:2053-2066,1995
|
10.1142/S0217751X95000991
| null |
hep-ph
| null |
The $e^{+}\,e^{-}\,\rightarrow\,l^{+}\, \l^{-}\,\gamma\,\gamma$ anomalous
events, detected by $L3$ de\-tec\-tor at $e^+ e^-$ $CERN-LEP$ collider have
been analysed. It has been shown that the interpretation of such events as a
manifestation of scalar (pseudoscalar) resonance with the mass of 60 GeV
contradicts other experimental data. In case of a possible existence that kind
of resonance, the perspectives to discover one in some processes at future
$e^+e^-$ colliders have been discussed.
|
[
{
"created": "Mon, 25 Jul 1994 14:17:04 GMT",
"version": "v1"
}
] |
2009-09-25
|
[
[
"Litvin",
"V. A.",
""
],
[
"Slabospitsky",
"S. R.",
""
]
] |
The $e^{+}\,e^{-}\,\rightarrow\,l^{+}\, \l^{-}\,\gamma\,\gamma$ anomalous events, detected by $L3$ de\-tec\-tor at $e^+ e^-$ $CERN-LEP$ collider have been analysed. It has been shown that the interpretation of such events as a manifestation of scalar (pseudoscalar) resonance with the mass of 60 GeV contradicts other experimental data. In case of a possible existence that kind of resonance, the perspectives to discover one in some processes at future $e^+e^-$ colliders have been discussed.
|
hep-ph/0312191
|
Thomas D. Cohen
|
Thomas D. Cohen
|
The theta^+ baryon in soliton models: large Nc QCD and the validity of
rigid-rotor quantization
|
19 pages; A shorter more readable version
|
Phys.Rev. D70 (2004) 014011
|
10.1103/PhysRevD.70.014011
| null |
hep-ph hep-th nucl-th
| null |
A light collective theta+ baryon state (with strangeness +1) was predicted
via rigid-rotor collective quantization of SU(3) chiral soliton models. This
paper explores the validity of this treatment. A number of rather general
analyses suggest that predictions of exotic baryon properties based on this
approximation do not follow from large Nc QCD. These include an analysis of the
baryon's width, a comparison of the predictions with general large Nc
consistency conditions of the Gervais-Sakita-Dashen-Manohar type; an
application of the technique to QCD in the limit where the quarks are heavy; a
comparison of this method with the vibration approach of Callan and Klebanov;
and the 1/Nc scaling of the excitation energy. It is suggested that the origin
of the problem lies in an implicit assumption in the that the collective motion
is orthogonal to vibrational motion. While true for non-exotic motion, the
Wess-Zumino term induces mixing at leading order between collective and
vibrational motion with exotic quantum numbers. This suggests that successful
phenomenological predictions of theta+ properties based on rigid-rotor
quantization were accidental.
|
[
{
"created": "Mon, 15 Dec 2003 19:04:07 GMT",
"version": "v1"
},
{
"created": "Fri, 9 Jan 2004 13:28:51 GMT",
"version": "v2"
},
{
"created": "Thu, 26 Feb 2004 15:07:26 GMT",
"version": "v3"
}
] |
2009-11-10
|
[
[
"Cohen",
"Thomas D.",
""
]
] |
A light collective theta+ baryon state (with strangeness +1) was predicted via rigid-rotor collective quantization of SU(3) chiral soliton models. This paper explores the validity of this treatment. A number of rather general analyses suggest that predictions of exotic baryon properties based on this approximation do not follow from large Nc QCD. These include an analysis of the baryon's width, a comparison of the predictions with general large Nc consistency conditions of the Gervais-Sakita-Dashen-Manohar type; an application of the technique to QCD in the limit where the quarks are heavy; a comparison of this method with the vibration approach of Callan and Klebanov; and the 1/Nc scaling of the excitation energy. It is suggested that the origin of the problem lies in an implicit assumption in the that the collective motion is orthogonal to vibrational motion. While true for non-exotic motion, the Wess-Zumino term induces mixing at leading order between collective and vibrational motion with exotic quantum numbers. This suggests that successful phenomenological predictions of theta+ properties based on rigid-rotor quantization were accidental.
|
hep-ph/0204342
|
Hsin-Chia Cheng
|
Hsin-Chia Cheng, Konstantin T. Matchev, Martin Schmaltz
|
Radiative Corrections to Kaluza-Klein Masses
|
33 pages, 13 figures, uses RevTeX4 and axodraw
|
Phys.Rev.D66:036005,2002
|
10.1103/PhysRevD.66.036005
|
EFI-02-73, UFIFT-HEP-02-6, BUHEP-02-20
|
hep-ph
| null |
Extra-dimensional theories contain a number of almost degenerate states at
each Kaluza-Klein level. If extra dimensional momentum is at least
approximately conserved then the phenomenology of such nearly degenerate states
depends crucially on the mass splittings between KK modes. We calculate the
complete one-loop radiative corrections to KK masses in general 5 and 6
dimensional theories. We apply our formulae to the example of universal extra
dimensions and show that the radiative corrections are essential to any
meaningful study of the phenomenology. Our calculations demonstrate that
Feynman diagrams with loops wrapping the extra dimensions are well-defined and
cut-off independent even though higher dimensional theories are not
renormalizable.
|
[
{
"created": "Mon, 29 Apr 2002 18:53:20 GMT",
"version": "v1"
}
] |
2009-07-09
|
[
[
"Cheng",
"Hsin-Chia",
""
],
[
"Matchev",
"Konstantin T.",
""
],
[
"Schmaltz",
"Martin",
""
]
] |
Extra-dimensional theories contain a number of almost degenerate states at each Kaluza-Klein level. If extra dimensional momentum is at least approximately conserved then the phenomenology of such nearly degenerate states depends crucially on the mass splittings between KK modes. We calculate the complete one-loop radiative corrections to KK masses in general 5 and 6 dimensional theories. We apply our formulae to the example of universal extra dimensions and show that the radiative corrections are essential to any meaningful study of the phenomenology. Our calculations demonstrate that Feynman diagrams with loops wrapping the extra dimensions are well-defined and cut-off independent even though higher dimensional theories are not renormalizable.
|
hep-ph/9802357
|
Linda M. Stuart
|
E143 collaboration
|
Measurements of the Proton and Deuteron Spin Structure Functions g1 and
g2
|
116 pages, 38 tables, 25 figures Submitted to Physical Review D
|
Phys.Rev.D58:112003,1998
|
10.1103/PhysRevD.58.112003
|
SLAC-PUB-7753
|
hep-ph
| null |
Measurements are reported of the proton and deuteron spin structure functions
g1 at beam energies of 29.1, 16.2, and 9.7 GeV and g2 at a beam energy of 29.1
GeV. The integrals of g1 over x have been evaluated at fixed Q**2 = 3
(GeV/c)**2 using the full data set. The Q**2 dependence of the ratio g1/F1 was
studied and found to be small for Q**2 > 1 (GeV/c)**2. Within experimental
precision the g2 data are well-described by the Wandzura-Wilczek twist-2
contribution. Twist-3 matrix elements were extracted and compared to
theoretical predictions. The asymmetry A2 was measured and found to be
significantly smaller than the positivity limit for both proton and deuteron
targets. A2 for the proton is found to be positive and inconsistent with zero.
Measurements of g1 in the resonance region show strong variations with x and
Q**2, consistent with resonant amplitudes extracted from unpolarized data.
These data allow us to study the Q**2 dependence of the first moments of g1
below the scaling region.
|
[
{
"created": "Wed, 18 Feb 1998 23:24:26 GMT",
"version": "v1"
}
] |
2012-08-27
|
[
[
"E143 collaboration",
"",
""
]
] |
Measurements are reported of the proton and deuteron spin structure functions g1 at beam energies of 29.1, 16.2, and 9.7 GeV and g2 at a beam energy of 29.1 GeV. The integrals of g1 over x have been evaluated at fixed Q**2 = 3 (GeV/c)**2 using the full data set. The Q**2 dependence of the ratio g1/F1 was studied and found to be small for Q**2 > 1 (GeV/c)**2. Within experimental precision the g2 data are well-described by the Wandzura-Wilczek twist-2 contribution. Twist-3 matrix elements were extracted and compared to theoretical predictions. The asymmetry A2 was measured and found to be significantly smaller than the positivity limit for both proton and deuteron targets. A2 for the proton is found to be positive and inconsistent with zero. Measurements of g1 in the resonance region show strong variations with x and Q**2, consistent with resonant amplitudes extracted from unpolarized data. These data allow us to study the Q**2 dependence of the first moments of g1 below the scaling region.
|
2405.03581
|
Victor Goncalves
|
Yuri N. Lima, Andr\'e V. Giannini, Victor P. Goncalves
|
$D^0$ meson production in $pp$ collisions at large $Q_s^2$
|
14 pages, 13 figures
| null | null | null |
hep-ph hep-ex
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
The impact of the non-linear effects in the QCD dynamics on the observables
is directly related to the magnitude of the saturation scale $Q_s$, which is
predicted to increase with the energy, rapidity and multiplicity. In this
paper, we investigate the $D^0$ meson production in $pp$ collisions at forward
rapidities and/or high multiplicities considering the Color Glass Condensate
(CGC) formalism and the solutions of the running coupling Balitsky - Kovchegov
(BK) equation. The contributions of gluon - and charm - initiated processes are
taken into account, and a comparison with the current LHCb data is performed.
The impact of an intrinsic charm component in the proton's wave function is
also estimated. Predictions for the self-normalized yields of $D^0$ mesons as a
function of the multiplicity of coproduced charged hadrons are presented,
considering $pp$ collisions at $\sqrt{s} = 13$ TeV and different values of the
meson rapidity. A comparison with the predictions for the kaon and isolated
photon production is performed. Our results indicate that a future experimental
analysis of the $D^0$ meson production at forward rapidities and high
multiplicities can be useful to probe the CGC formalism and to disentangle the
contribution of initial - and final - state effects.
|
[
{
"created": "Mon, 6 May 2024 15:53:41 GMT",
"version": "v1"
}
] |
2024-05-07
|
[
[
"Lima",
"Yuri N.",
""
],
[
"Giannini",
"André V.",
""
],
[
"Goncalves",
"Victor P.",
""
]
] |
The impact of the non-linear effects in the QCD dynamics on the observables is directly related to the magnitude of the saturation scale $Q_s$, which is predicted to increase with the energy, rapidity and multiplicity. In this paper, we investigate the $D^0$ meson production in $pp$ collisions at forward rapidities and/or high multiplicities considering the Color Glass Condensate (CGC) formalism and the solutions of the running coupling Balitsky - Kovchegov (BK) equation. The contributions of gluon - and charm - initiated processes are taken into account, and a comparison with the current LHCb data is performed. The impact of an intrinsic charm component in the proton's wave function is also estimated. Predictions for the self-normalized yields of $D^0$ mesons as a function of the multiplicity of coproduced charged hadrons are presented, considering $pp$ collisions at $\sqrt{s} = 13$ TeV and different values of the meson rapidity. A comparison with the predictions for the kaon and isolated photon production is performed. Our results indicate that a future experimental analysis of the $D^0$ meson production at forward rapidities and high multiplicities can be useful to probe the CGC formalism and to disentangle the contribution of initial - and final - state effects.
|
0902.3246
|
Itay Yavin
|
Clifford Cheung, Joshua T. Ruderman, Lian-Tao Wang, and Itay Yavin
|
Kinetic Mixing as the Origin of Light Dark Scales
|
4 pages, 2 plots, published version, some clarifications added
|
Phys.Rev.D80:035008,2009
|
10.1103/PhysRevD.80.035008
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We propose a model in which supersymmetric weak scale dark matter is charged
under a U(1)_d dark gauge symmetry. Kinetic mixing between U(1)_d and
hypercharge generates the appropriate hierarchy of scales needed to explain
PAMELA and ATIC with a GeV scale force carrier and DAMA (or INTEGRAL) using the
proposals of inelastic (or, respectively, exciting) dark matter. Because of the
extreme simplicity of this setup, observational constraints lead to unambiguous
determination of the model parameters. In particular, the DAMA scattering cross
section is directly related to the size of the hypercharge D-term vacuum
expectation value. The known relic abundance of DM can be used to fix the ratio
of the dark sector coupling to the dark matter mass. Finally, the recent
observation of cosmic ray positron and electron excesses can be used to fix the
mass of the dark matter through the observation of a shoulder in the spectrum
and the size of the kinetic mixing by fitting to the rate. These parameters can
be used to make further predictions, which can be checked at future direct
detection, indirect detection, as well as collider experiments.
|
[
{
"created": "Thu, 19 Feb 2009 17:28:17 GMT",
"version": "v1"
},
{
"created": "Tue, 10 Mar 2009 03:25:12 GMT",
"version": "v2"
},
{
"created": "Thu, 13 Aug 2009 02:29:44 GMT",
"version": "v3"
}
] |
2009-09-02
|
[
[
"Cheung",
"Clifford",
""
],
[
"Ruderman",
"Joshua T.",
""
],
[
"Wang",
"Lian-Tao",
""
],
[
"Yavin",
"Itay",
""
]
] |
We propose a model in which supersymmetric weak scale dark matter is charged under a U(1)_d dark gauge symmetry. Kinetic mixing between U(1)_d and hypercharge generates the appropriate hierarchy of scales needed to explain PAMELA and ATIC with a GeV scale force carrier and DAMA (or INTEGRAL) using the proposals of inelastic (or, respectively, exciting) dark matter. Because of the extreme simplicity of this setup, observational constraints lead to unambiguous determination of the model parameters. In particular, the DAMA scattering cross section is directly related to the size of the hypercharge D-term vacuum expectation value. The known relic abundance of DM can be used to fix the ratio of the dark sector coupling to the dark matter mass. Finally, the recent observation of cosmic ray positron and electron excesses can be used to fix the mass of the dark matter through the observation of a shoulder in the spectrum and the size of the kinetic mixing by fitting to the rate. These parameters can be used to make further predictions, which can be checked at future direct detection, indirect detection, as well as collider experiments.
|
1002.3631
|
Yue Zhang
|
Borut Bajc, Tsedenbaljir Enkhbat, Dilip Kumar Ghosh, Goran Senjanovic,
Yue Zhang
|
MSSM in view of PAMELA and Fermi-LAT
|
Published version, figures updated
|
JHEP 1005:048,2010
|
10.1007/JHEP05(2010)048
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We take the MSSM as a complete theory of low energy phenomena, including
neutrino masses and mixings. This immediately implies that the gravitino is the
only possible dark matter candidate. We study the implications of the
astrophysical experiments such as PAMELA and Fermi-LAT, on this scenario. The
theory can account for both the realistic neutrino masses and mixings, and the
PAMELA data as long as the slepton masses lie in the $500-10^6 $TeV range. The
squarks can be either light or heavy, depending on their contribution to
radiative neutrino masses. On the other hand, the Fermi-LAT data imply heavy
superpartners, all out of LHC reach, simply on the grounds of the energy scale
involved, for the gravitino must weigh more than 2 TeV. The perturbativity of
the theory also implies an upper bound on its mass, approximately $6-7 $TeV.
|
[
{
"created": "Fri, 19 Feb 2010 18:14:37 GMT",
"version": "v1"
},
{
"created": "Mon, 21 Jun 2010 10:16:26 GMT",
"version": "v2"
}
] |
2015-03-13
|
[
[
"Bajc",
"Borut",
""
],
[
"Enkhbat",
"Tsedenbaljir",
""
],
[
"Ghosh",
"Dilip Kumar",
""
],
[
"Senjanovic",
"Goran",
""
],
[
"Zhang",
"Yue",
""
]
] |
We take the MSSM as a complete theory of low energy phenomena, including neutrino masses and mixings. This immediately implies that the gravitino is the only possible dark matter candidate. We study the implications of the astrophysical experiments such as PAMELA and Fermi-LAT, on this scenario. The theory can account for both the realistic neutrino masses and mixings, and the PAMELA data as long as the slepton masses lie in the $500-10^6 $TeV range. The squarks can be either light or heavy, depending on their contribution to radiative neutrino masses. On the other hand, the Fermi-LAT data imply heavy superpartners, all out of LHC reach, simply on the grounds of the energy scale involved, for the gravitino must weigh more than 2 TeV. The perturbativity of the theory also implies an upper bound on its mass, approximately $6-7 $TeV.
|
1312.3017
|
Keiko Nagao
|
Keiko I. Nagao
|
Measuring Dark Matter Distribution in Directional Direct Detection
|
5pages, 11 figures, to appear in the proceedings of CYGNUS 2013
(CNUM: C13-06-10.6)
| null |
10.1088/1742-6596/469/1/012009
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Direct detection of dark matter with directional sensitivity offers not only
measurement of both recoil energy and direction of dark matter, but also a way
to understand dark matter distribution in the Galaxy. Maxwell distribution is
usually supposed as the distribution near the Earth, however, deviation from
that, caused by tidal streams in the Galaxy, has been suggested. We explore the
possibility of distinguishing the distribution by direct detection using
nuclear emulsions.
|
[
{
"created": "Wed, 11 Dec 2013 01:37:18 GMT",
"version": "v1"
}
] |
2015-06-18
|
[
[
"Nagao",
"Keiko I.",
""
]
] |
Direct detection of dark matter with directional sensitivity offers not only measurement of both recoil energy and direction of dark matter, but also a way to understand dark matter distribution in the Galaxy. Maxwell distribution is usually supposed as the distribution near the Earth, however, deviation from that, caused by tidal streams in the Galaxy, has been suggested. We explore the possibility of distinguishing the distribution by direct detection using nuclear emulsions.
|
hep-ph/0408010
|
Byung-Yoon Park
|
Byung-Yoon Park, Hee-Jung Lee, Vicente Vento, Joon-Il Kim, Dong-Pil
Min, Mannque Rho
|
Unified Approach to Dense Matter
|
6 pages, 4 figures, a talk given at the international conference QCD
DOWN UNDER, March 10 - 19, Adelaide, Australia
| null |
10.1016/j.nuclphysbps.2004.12.040
| null |
hep-ph nucl-th
| null |
We apply the Skyrme model to dense hadronic matter, which provides a unified
approach to high density, valid in the large Nc limit. In our picture, dense
hadronic matter is described by the classical soliton configuration with
minimum energy for the given baryon number density. By incorporating the meson
fluctuations on such ground state we obtain an effective Lagrangian for meson
dynamics in a dense medium. Our starting point has been the Skyrme model
defined in terms of pions, thereafter we have extended and improved the model
by incorporating other degrees of freedom such as dilaton, kaons and vector
mesons.
|
[
{
"created": "Mon, 2 Aug 2004 00:13:23 GMT",
"version": "v1"
}
] |
2009-11-10
|
[
[
"Park",
"Byung-Yoon",
""
],
[
"Lee",
"Hee-Jung",
""
],
[
"Vento",
"Vicente",
""
],
[
"Kim",
"Joon-Il",
""
],
[
"Min",
"Dong-Pil",
""
],
[
"Rho",
"Mannque",
""
]
] |
We apply the Skyrme model to dense hadronic matter, which provides a unified approach to high density, valid in the large Nc limit. In our picture, dense hadronic matter is described by the classical soliton configuration with minimum energy for the given baryon number density. By incorporating the meson fluctuations on such ground state we obtain an effective Lagrangian for meson dynamics in a dense medium. Our starting point has been the Skyrme model defined in terms of pions, thereafter we have extended and improved the model by incorporating other degrees of freedom such as dilaton, kaons and vector mesons.
|
hep-ph/9811257
|
Takeo Moroi
|
Takeo Moroi
|
Electric Dipole Moments in Gauge Mediated Models and a Solution to the
SUSY CP Problem
|
13 pages, 2 figures
|
Phys.Lett. B447 (1999) 75-82
|
10.1016/S0370-2693(98)01576-7
|
IASSNS-HEP-98/94
|
hep-ph
| null |
The SUSY CP problem in the framework of gauge mediated SUSY breaking model is
considered. We first discuss the electric dipole moments of the electron and
neutron, which are likely to be larger than the experimental upper bound if all
the phases in the Lagrangian are O(1). We derive a constraint on the phases in
the so-called $\mu$- and $B_\mu$-parameters and gaugino masses. Then, we
discuss a model in which the CP violating phase can be adequately suppressed.
If the $\mu$- and $B_\mu$-parameters originate from the same superpotential
interaction as the SUSY breaking field, the CP violating phase vanishes.
However, in this class of models, the ratio $B_\mu/\mu$ becomes too large, and
we discuss a possible scenario to fix this problem.
|
[
{
"created": "Thu, 5 Nov 1998 21:19:56 GMT",
"version": "v1"
}
] |
2009-10-31
|
[
[
"Moroi",
"Takeo",
""
]
] |
The SUSY CP problem in the framework of gauge mediated SUSY breaking model is considered. We first discuss the electric dipole moments of the electron and neutron, which are likely to be larger than the experimental upper bound if all the phases in the Lagrangian are O(1). We derive a constraint on the phases in the so-called $\mu$- and $B_\mu$-parameters and gaugino masses. Then, we discuss a model in which the CP violating phase can be adequately suppressed. If the $\mu$- and $B_\mu$-parameters originate from the same superpotential interaction as the SUSY breaking field, the CP violating phase vanishes. However, in this class of models, the ratio $B_\mu/\mu$ becomes too large, and we discuss a possible scenario to fix this problem.
|
1706.07779
|
Nejc Ko\v{s}nik
|
Ilja Dor\v{s}ner, Svjetlana Fajfer, Darius A. Faroughy, Nejc
Ko\v{s}nik
|
The role of the $S_3$ GUT leptoquark in flavor universality and collider
searches
|
Published version. 32 pages, 6 figures
|
J. High Energ. Phys. (2017) 2017: 188
|
10.1007/JHEP10(2017)188
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We investigate the ability of the $S_3$ scalar leptoquark to address the
recent hints of lepton universality violation in $B$ meson decays. The $S_3$
leptoquark with quantum numbers $(\overline{\mathbf{3}},\mathbf{3},1/3)$
naturally emerges in the context of an $SU(5)$ GUT model without any conflict
with the stringent limits from observed nucleon stability. Scalar leptoquark
$S_3$ with left-handed couplings to 2nd and 3rd generations of charged leptons
and down-type quarks seems well-suited to address both $R_{K^{(*)}}$ and
$R_{D^{(*)}}$. We quantify this suitability with numerical fits to a plethora
of relevant flavor observables. The proposed $SU(5)$ model calls for a second
leptoquark state, i.e., $\tilde{R}_2$ with quantum numbers
$(\mathbf{3},\mathbf{2},1/6)$, if one is to generate gauge coupling unification
and neutrino mass. We accordingly include it in our study to investigate
$\tilde{R}_2$'s ability to offset adverse effects of $S_3$ and thus improve a
quality of numerical fits. A global fit of the leptoquark Yukawa couplings
shows that large couplings of light $S_3$ to $\tau$ leptons are preferred. We
furthermore identify $B \to K^{(*)} \bar\nu\nu$ as the most sensitive channel
to probe the preferred region of parameter space. Large couplings of $S_3$ to
$\tau$ leptons are finally confronted with the experimental searches for $\tau$
final states at the Large Hadron Collider. These searches comprise a study of
decay products of the leptoquark pair production, as well as, and more
importantly, an analysis of the high-mass $\tau\tau$ final states.
|
[
{
"created": "Fri, 23 Jun 2017 17:02:19 GMT",
"version": "v1"
},
{
"created": "Wed, 20 Sep 2017 12:34:43 GMT",
"version": "v2"
},
{
"created": "Mon, 27 Nov 2017 21:01:32 GMT",
"version": "v3"
}
] |
2017-11-29
|
[
[
"Doršner",
"Ilja",
""
],
[
"Fajfer",
"Svjetlana",
""
],
[
"Faroughy",
"Darius A.",
""
],
[
"Košnik",
"Nejc",
""
]
] |
We investigate the ability of the $S_3$ scalar leptoquark to address the recent hints of lepton universality violation in $B$ meson decays. The $S_3$ leptoquark with quantum numbers $(\overline{\mathbf{3}},\mathbf{3},1/3)$ naturally emerges in the context of an $SU(5)$ GUT model without any conflict with the stringent limits from observed nucleon stability. Scalar leptoquark $S_3$ with left-handed couplings to 2nd and 3rd generations of charged leptons and down-type quarks seems well-suited to address both $R_{K^{(*)}}$ and $R_{D^{(*)}}$. We quantify this suitability with numerical fits to a plethora of relevant flavor observables. The proposed $SU(5)$ model calls for a second leptoquark state, i.e., $\tilde{R}_2$ with quantum numbers $(\mathbf{3},\mathbf{2},1/6)$, if one is to generate gauge coupling unification and neutrino mass. We accordingly include it in our study to investigate $\tilde{R}_2$'s ability to offset adverse effects of $S_3$ and thus improve a quality of numerical fits. A global fit of the leptoquark Yukawa couplings shows that large couplings of light $S_3$ to $\tau$ leptons are preferred. We furthermore identify $B \to K^{(*)} \bar\nu\nu$ as the most sensitive channel to probe the preferred region of parameter space. Large couplings of $S_3$ to $\tau$ leptons are finally confronted with the experimental searches for $\tau$ final states at the Large Hadron Collider. These searches comprise a study of decay products of the leptoquark pair production, as well as, and more importantly, an analysis of the high-mass $\tau\tau$ final states.
|
1711.09803
|
Harri Niemi
|
K. J. Eskola, H. Niemi, R. Paatelainen, K. Tuominen
|
Predictions for multiplicities and flow harmonics in 5.44 TeV Xe+Xe
collisions at the CERN Large Hadron Collider
|
7 pages, 7 figures, revised version. The predicted flow coefficients
vn with deformed Xe, and their ratios to 5.023 TeV Pb+Pb vn's are included as
ancillary files
|
Phys. Rev. C 97, 034911 (2018)
|
10.1103/PhysRevC.97.034911
| null |
hep-ph nucl-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We present the next-to-leading-order event-by-event EKRT model predictions
for the centrality dependence of the charged hadron multiplicity in the
pseudorapidity interval $|\eta|\le 0.5$, and for the centrality dependence of
the charged hadron flow harmonics $v_n\{2\}$ obtained from 2-particle
cumulants, in $\sqrt{s_{NN}}=5.44$ TeV Xe+Xe collisions at the CERN Large
Hadron Collider. Our prediction for the 0-5 \% central charged multiplicity is
$dN_{\rm ch}/d\eta =1218\pm 46$. We also predict $v_n\{2\}$ in Xe+Xe collisions
to increase more slowly from central towards peripheral collisions than those
in a Pb+Pb system. We find that at $10 \dots 50$\% centralities $v_2\{2\}$ is
smaller and $v_3\{2\}$ is larger than in the Pb+Pb system while $v_4\{2\}$ is
of the same magnitude in both systems. We also find that the ratio of flow
harmonics in Xe+Xe collisions and in Pb+Pb collisions shows a slight
sensitivity to the temperature dependence of the shear-viscosity-to-entropy
ratio. As we discuss here, the new nuclear mass-number systematics especially
in the flow harmonics serves as a welcome further constraint for describing the
space-time evolution of a heavy-ion system and for determining the shear
viscosity and other transport properties of strongly interacting matter.
|
[
{
"created": "Mon, 27 Nov 2017 16:20:09 GMT",
"version": "v1"
},
{
"created": "Wed, 2 May 2018 14:54:28 GMT",
"version": "v2"
}
] |
2018-05-03
|
[
[
"Eskola",
"K. J.",
""
],
[
"Niemi",
"H.",
""
],
[
"Paatelainen",
"R.",
""
],
[
"Tuominen",
"K.",
""
]
] |
We present the next-to-leading-order event-by-event EKRT model predictions for the centrality dependence of the charged hadron multiplicity in the pseudorapidity interval $|\eta|\le 0.5$, and for the centrality dependence of the charged hadron flow harmonics $v_n\{2\}$ obtained from 2-particle cumulants, in $\sqrt{s_{NN}}=5.44$ TeV Xe+Xe collisions at the CERN Large Hadron Collider. Our prediction for the 0-5 \% central charged multiplicity is $dN_{\rm ch}/d\eta =1218\pm 46$. We also predict $v_n\{2\}$ in Xe+Xe collisions to increase more slowly from central towards peripheral collisions than those in a Pb+Pb system. We find that at $10 \dots 50$\% centralities $v_2\{2\}$ is smaller and $v_3\{2\}$ is larger than in the Pb+Pb system while $v_4\{2\}$ is of the same magnitude in both systems. We also find that the ratio of flow harmonics in Xe+Xe collisions and in Pb+Pb collisions shows a slight sensitivity to the temperature dependence of the shear-viscosity-to-entropy ratio. As we discuss here, the new nuclear mass-number systematics especially in the flow harmonics serves as a welcome further constraint for describing the space-time evolution of a heavy-ion system and for determining the shear viscosity and other transport properties of strongly interacting matter.
|
hep-ph/9905263
|
Andrei Belitsky
|
A.V. Belitsky, D. Muller
|
Scaling violations and off-forward parton distributions: leading order
and beyond
|
3 pages, LaTeX, 3 figures, Talk given at the 7th International
Workshop on Deep Inelastic Scattring and QCD, DESY-Zeuthen, April 19-23, 1999
|
Nucl.Phys.Proc.Suppl. 79 (1999) 573-575
|
10.1016/S0920-5632(99)00787-2
| null |
hep-ph
| null |
We give an outline of a formalism for the solution of the evolution equations
for off-forward parton distributions in leading and next-to-leading orders
based on partial conformal wave expansion and orthogonal polynomials
reconstruction.
|
[
{
"created": "Thu, 6 May 1999 14:00:59 GMT",
"version": "v1"
}
] |
2009-10-31
|
[
[
"Belitsky",
"A. V.",
""
],
[
"Muller",
"D.",
""
]
] |
We give an outline of a formalism for the solution of the evolution equations for off-forward parton distributions in leading and next-to-leading orders based on partial conformal wave expansion and orthogonal polynomials reconstruction.
|
1511.04449
|
Alex Gomes Dias
|
Alexandre Alves, D. A. Camargo, Alex G. Dias
|
Heavy Higgs Coupled to Vector-like Quarks: Strong CP Problem and Search
Prospects at the 14 TeV LHC
|
21 pages, 8 figures, just a correction in Table I
|
Phys. Rev. D 94, 015027 (2016)
|
10.1103/PhysRevD.94.015027
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Motivated by a solution to the strong CP problem we propose a model where a
new heavy neutral CP-even Higgs boson couples to vector-like quarks enhancing
its production cross section whose dominant decays are into weak bosons. The
masses of the vector-like quarks are generated through interactions with a
singlet scalar field charged under a broken global $U(1)$ symmetry providing a
solution to the strong CP problem by means of the Peccei-Quinn mechanism. The
diboson excess observed by the ATLAS Collaboration is discussed as the new
heavy Higgs boson is a candidate to explain a possible signal in this channel.
We also show that the 14 TeV LHC is capable of discovering this heavy Higgs
with masses up to 1 TeV in the $H\to ZZ\to \ell^+\ell^-\ell^{\prime
+}\ell^{\prime -}$ search channel using boosted decision trees to better
discriminate between signals and backgrounds and to tame systematic
uncertainties in the background rates.
|
[
{
"created": "Fri, 13 Nov 2015 21:00:07 GMT",
"version": "v1"
},
{
"created": "Sat, 23 Jul 2016 23:07:14 GMT",
"version": "v2"
},
{
"created": "Tue, 23 Aug 2016 01:01:10 GMT",
"version": "v3"
}
] |
2016-08-24
|
[
[
"Alves",
"Alexandre",
""
],
[
"Camargo",
"D. A.",
""
],
[
"Dias",
"Alex G.",
""
]
] |
Motivated by a solution to the strong CP problem we propose a model where a new heavy neutral CP-even Higgs boson couples to vector-like quarks enhancing its production cross section whose dominant decays are into weak bosons. The masses of the vector-like quarks are generated through interactions with a singlet scalar field charged under a broken global $U(1)$ symmetry providing a solution to the strong CP problem by means of the Peccei-Quinn mechanism. The diboson excess observed by the ATLAS Collaboration is discussed as the new heavy Higgs boson is a candidate to explain a possible signal in this channel. We also show that the 14 TeV LHC is capable of discovering this heavy Higgs with masses up to 1 TeV in the $H\to ZZ\to \ell^+\ell^-\ell^{\prime +}\ell^{\prime -}$ search channel using boosted decision trees to better discriminate between signals and backgrounds and to tame systematic uncertainties in the background rates.
|
hep-ph/0002107
|
Motohiko Yoshimura
|
M. Yoshimura
|
Relic abundance of dark matter particles: new formulation and new result
of abundance calculation
|
7 pages, LATEX file. Talk given at COSMO99
| null |
10.1142/9789812792129_0004
|
TU/00/586
|
hep-ph
| null |
A new theoretical framework for computation of the relic abundance of cold
dark matter particles such as LSP is presented and some generic features of new
results are discussed. The most important is a generalization of the Boltzmann
equation to include off-shell effects and its thermal average over cosmic
medium. It is shown that at very low temperatures, much below the mass of
annihilating particles, equilibrium abundance is suppressed only by powers of
temperature instead of the exponential Boltzmann factor. This change gives a
larger relic abundance when heavy particles freeze out at these low
temperatures.
|
[
{
"created": "Thu, 10 Feb 2000 01:33:43 GMT",
"version": "v1"
}
] |
2016-11-03
|
[
[
"Yoshimura",
"M.",
""
]
] |
A new theoretical framework for computation of the relic abundance of cold dark matter particles such as LSP is presented and some generic features of new results are discussed. The most important is a generalization of the Boltzmann equation to include off-shell effects and its thermal average over cosmic medium. It is shown that at very low temperatures, much below the mass of annihilating particles, equilibrium abundance is suppressed only by powers of temperature instead of the exponential Boltzmann factor. This change gives a larger relic abundance when heavy particles freeze out at these low temperatures.
|
1107.4523
|
Norimi Yokozaki
|
Masaki Asano, Takeo Moroi, Norimi Yokozaki
|
Singlet Boson in Supersymmetric Model as a Mimic of the Standard Model
Higgs at the LHC
|
10 pages, 4 figures
| null |
10.1016/j.physletb.2012.01.043
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We show that the gauge singlet scalar boson in low-energy supersymmetric
model may behave as the standard model (SM) Higgs boson if the singlet couples
to (heavy) vector-like colored particles. In this case, the SM-Higgs-like
signal at the LHC can be mimicked by the singlet production process for wide
range of the singlet mass.
|
[
{
"created": "Fri, 22 Jul 2011 14:28:48 GMT",
"version": "v1"
}
] |
2015-05-28
|
[
[
"Asano",
"Masaki",
""
],
[
"Moroi",
"Takeo",
""
],
[
"Yokozaki",
"Norimi",
""
]
] |
We show that the gauge singlet scalar boson in low-energy supersymmetric model may behave as the standard model (SM) Higgs boson if the singlet couples to (heavy) vector-like colored particles. In this case, the SM-Higgs-like signal at the LHC can be mimicked by the singlet production process for wide range of the singlet mass.
|
2008.06919
|
Evangelos Matsinos
|
Evangelos Matsinos
|
Determination of the masses and decay widths of the well-established $s$
and $p$ baryon resonances below $2$ GeV
|
17 pages
| null | null | null |
hep-ph nucl-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
This study appertains to the extraction of estimates for the masses and for
the partial decay widths to pion-nucleon final states of the well-established
(four-star) $s$ and $p$ baryon resonances below $2$ GeV. These estimates are
exclusively obtained from the data contained in the recent compilation by the
Particle Data Group. Only the $N$ ($S=0,I=1/2$) and the $\Delta$ ($S=0,I=3/2$)
states are considered, where $S$ and $I$ denote strangeness and total isospin,
respectively.
|
[
{
"created": "Sun, 16 Aug 2020 14:34:04 GMT",
"version": "v1"
}
] |
2020-08-18
|
[
[
"Matsinos",
"Evangelos",
""
]
] |
This study appertains to the extraction of estimates for the masses and for the partial decay widths to pion-nucleon final states of the well-established (four-star) $s$ and $p$ baryon resonances below $2$ GeV. These estimates are exclusively obtained from the data contained in the recent compilation by the Particle Data Group. Only the $N$ ($S=0,I=1/2$) and the $\Delta$ ($S=0,I=3/2$) states are considered, where $S$ and $I$ denote strangeness and total isospin, respectively.
|
hep-ph/0605039
|
Alakabha Datta
|
Alakabha Datta
|
$B_s$ Mixing and New Physics in hadronic $b \to s \bar{q} q$ transitions
|
19 pages, no figures, references added, text added, accepted for
publication
|
Phys.Rev.D74:014022,2006
|
10.1103/PhysRevD.74.014022
| null |
hep-ph
| null |
We study the implication of the recent $\Delta m_s$ measurement on $ b \to s
\bar{q} q$ transitions. We show that it is possible, in the presence of a
flavour symmetry, that the phase in $B_s$ mixing may be unobservable even with
new CP odd phases in $b \to s$ transitions. These phases may then produce new
CP odd effects in certain $b \to s \bar{q} q $ transitions like $ B \to K \pi$
but not in others like $ B_d \to \phi K_s$. Working in a two higgs doublet
model of new physics we discuss the allowed NP contribution to $B \to K \pi$
and $ B_d \to \phi K_s$ decays with the new $ Delta m_s$ measurement.
|
[
{
"created": "Thu, 4 May 2006 01:24:55 GMT",
"version": "v1"
},
{
"created": "Wed, 10 May 2006 22:00:20 GMT",
"version": "v2"
},
{
"created": "Thu, 13 Jul 2006 20:36:14 GMT",
"version": "v3"
}
] |
2008-11-26
|
[
[
"Datta",
"Alakabha",
""
]
] |
We study the implication of the recent $\Delta m_s$ measurement on $ b \to s \bar{q} q$ transitions. We show that it is possible, in the presence of a flavour symmetry, that the phase in $B_s$ mixing may be unobservable even with new CP odd phases in $b \to s$ transitions. These phases may then produce new CP odd effects in certain $b \to s \bar{q} q $ transitions like $ B \to K \pi$ but not in others like $ B_d \to \phi K_s$. Working in a two higgs doublet model of new physics we discuss the allowed NP contribution to $B \to K \pi$ and $ B_d \to \phi K_s$ decays with the new $ Delta m_s$ measurement.
|
2305.08032
|
Xun-Jie Xu
|
Xun-Jie Xu
|
Neutrino forces and experimental probes
|
6 pages, 4 figures, Contribution to the 2023 Electroweak session of
the 57th Rencontres de Moriond
| null | null | null |
hep-ph astro-ph.CO hep-ex
|
http://creativecommons.org/licenses/by/4.0/
|
Neutrinos as almost massless particles could mediate long-range forces, known
as neutrino forces. In this talk, I will introduce some theoretical aspects of
neutrino forces, including why the potential of a neutrino force has the
$1/r^{5}$ form and how it may vary under different circumstances. Experimental
probes and possible implications for cosmology are also briefly discussed.
|
[
{
"created": "Sun, 14 May 2023 00:27:52 GMT",
"version": "v1"
}
] |
2023-05-16
|
[
[
"Xu",
"Xun-Jie",
""
]
] |
Neutrinos as almost massless particles could mediate long-range forces, known as neutrino forces. In this talk, I will introduce some theoretical aspects of neutrino forces, including why the potential of a neutrino force has the $1/r^{5}$ form and how it may vary under different circumstances. Experimental probes and possible implications for cosmology are also briefly discussed.
|
hep-ph/0112205
|
Joseph Schechter
|
Joseph Schechter
|
Introduction to effective Lagrangians for QCD
|
12 pages, 2 figures, talk at "Compact stars in the QCD phase
diagram", Copenhagen, Aug. 15-18, 2001
|
eConf C010815 (2002) 76-87
| null |
SU-4252-750
|
hep-ph
| null |
A brief introduction to the effective Lagrangian treatment of QCD (in the
sense of using fields representing physical particles rather than quarks and
gluons) will be given. The historical evolution of the subject will be
discussed. Some background material related to a recent model for Gamma Ray
Bursters will be given. Finally, some recent work on low energy strong
interactions will be mentioned.
|
[
{
"created": "Fri, 14 Dec 2001 18:45:09 GMT",
"version": "v1"
}
] |
2007-05-23
|
[
[
"Schechter",
"Joseph",
""
]
] |
A brief introduction to the effective Lagrangian treatment of QCD (in the sense of using fields representing physical particles rather than quarks and gluons) will be given. The historical evolution of the subject will be discussed. Some background material related to a recent model for Gamma Ray Bursters will be given. Finally, some recent work on low energy strong interactions will be mentioned.
|
0811.4620
|
Ruben Flores
|
C. Juarez-Leon, A. Martinez, M. Neri, J.J. Torres, Ruben
Flores-Mendieta, A. Garcia
|
Radiative corrections to the three-body region of the Dalitz plot of
baryon semileptonic decays with angular correlation between polarized emitted
baryons and charged leptons: The initial-baryon rest frame case
|
7 pages, Revtex4, no figures
|
Phys.Rev.D79:057502,2009
|
10.1103/PhysRevD.79.057502
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We complement the results for the radiative corrections to the s2.l angular
correlation of baryon semileptonic decays of Ref. [1] with the final results in
the rest frame of the decaying baryon.
|
[
{
"created": "Thu, 27 Nov 2008 21:35:16 GMT",
"version": "v1"
}
] |
2009-03-24
|
[
[
"Juarez-Leon",
"C.",
""
],
[
"Martinez",
"A.",
""
],
[
"Neri",
"M.",
""
],
[
"Torres",
"J. J.",
""
],
[
"Flores-Mendieta",
"Ruben",
""
],
[
"Garcia",
"A.",
""
]
] |
We complement the results for the radiative corrections to the s2.l angular correlation of baryon semileptonic decays of Ref. [1] with the final results in the rest frame of the decaying baryon.
|
1211.0118
|
Shivani Gupta
|
Monojit Ghosh, Srubabati Goswami, Shivani Gupta
|
Two Zero Mass Matrices and Sterile Neutrinos
|
20 pages, 5 figures
| null |
10.1007/JHEP04(2013)103
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Recent experimental data is indicative of the existence of sterile neutrinos.
The minimal scheme that can account for the data and is consistent with
cosmological observations is the 3+1 picture which consists of three
predominantly active and one predominantly sterile neutrino with the fourth
neutrino being heavier than the other three. Within this scheme there are two
possibilities depending on whether the three light states obey normal or
inverted hierarchy. In this paper we consider the two zero textures of the low
energy neutrino mass matrix in presence of one additional sterile neutrino. We
find that among 45 possible two zero textures for this case, 15 are consistent
with all current observations. Remarkably, these correspond to the two-zero
textures of a three active neutrino mass matrix. We discuss the mass spectrum
and the parameter correlations that we find in the various textures. We also
present the effective mass governing neutrinoless double beta decay as a
function of the lowest mass.
|
[
{
"created": "Thu, 1 Nov 2012 08:36:56 GMT",
"version": "v1"
}
] |
2015-06-12
|
[
[
"Ghosh",
"Monojit",
""
],
[
"Goswami",
"Srubabati",
""
],
[
"Gupta",
"Shivani",
""
]
] |
Recent experimental data is indicative of the existence of sterile neutrinos. The minimal scheme that can account for the data and is consistent with cosmological observations is the 3+1 picture which consists of three predominantly active and one predominantly sterile neutrino with the fourth neutrino being heavier than the other three. Within this scheme there are two possibilities depending on whether the three light states obey normal or inverted hierarchy. In this paper we consider the two zero textures of the low energy neutrino mass matrix in presence of one additional sterile neutrino. We find that among 45 possible two zero textures for this case, 15 are consistent with all current observations. Remarkably, these correspond to the two-zero textures of a three active neutrino mass matrix. We discuss the mass spectrum and the parameter correlations that we find in the various textures. We also present the effective mass governing neutrinoless double beta decay as a function of the lowest mass.
|
hep-ph/9807444
|
Agaev Shahin Sabir
|
S.S.Agaev
|
Light Mesons elm Form Factor and Running Coupling Effects
|
10 pages, 2 figures. Talk given at the Euroconference QCD98,
Montpellier 2-8th July 1998, France; to appear in Proceedings
|
Nucl.Phys.Proc.Suppl. 74 (1999) 155-158
|
10.1016/S0920-5632(99)00153-X
| null |
hep-ph
| null |
The pion and kaon electromagnetic form factors $F_{M}(Q^2)$ are calculated at
the leading order of pQCD using the running coupling constant method. In
computations dependence of the meson distribution amplitudes on the hard scale
$Q^2$ is taken into account. The Borel transform and resummed expression for
$F_{M}(Q^2)$ are found. The effect of the next-to-leading order term in
expansion of $\alpha_{S}(\lambda Q^2)$ in terms of $\alpha_{S}(Q^2)$ on the
pion form factor $F_{\pi}(Q^2)$ is discussed, comparison is made with the
infrared matching scheme's result.
|
[
{
"created": "Tue, 21 Jul 1998 12:58:18 GMT",
"version": "v1"
}
] |
2009-10-31
|
[
[
"Agaev",
"S. S.",
""
]
] |
The pion and kaon electromagnetic form factors $F_{M}(Q^2)$ are calculated at the leading order of pQCD using the running coupling constant method. In computations dependence of the meson distribution amplitudes on the hard scale $Q^2$ is taken into account. The Borel transform and resummed expression for $F_{M}(Q^2)$ are found. The effect of the next-to-leading order term in expansion of $\alpha_{S}(\lambda Q^2)$ in terms of $\alpha_{S}(Q^2)$ on the pion form factor $F_{\pi}(Q^2)$ is discussed, comparison is made with the infrared matching scheme's result.
|
hep-ph/9710411
|
Anatoli Efremov
|
A.V. Efremov (JINR, Dubna, Russia)
|
Nuclear Structure Functions and Cumulative Processes
|
Latex file 9 pages 5 eps figures, wrapfig.sty. An updated version of
the talk at 13 International Seminar on Relativistic Nuclear Physics and QCD
(Dubna, Sept. 2-7, 1996) which includes new experimental data and some ideas
appeared since that time. Will appear in the Proceedings
| null | null | null |
hep-ph
| null |
The authors's point of view, based on QCD, on the nuclear quark structure is
presented. Different models for explaining the EMC--effect are considered. It
is also shown that cumulative production data are very useful for a better
understanding of the EMC--effect and give some evidence in favor of its
multiquark nature.
|
[
{
"created": "Mon, 20 Oct 1997 14:21:58 GMT",
"version": "v1"
}
] |
2007-05-23
|
[
[
"Efremov",
"A. V.",
"",
"JINR, Dubna, Russia"
]
] |
The authors's point of view, based on QCD, on the nuclear quark structure is presented. Different models for explaining the EMC--effect are considered. It is also shown that cumulative production data are very useful for a better understanding of the EMC--effect and give some evidence in favor of its multiquark nature.
|
hep-ph/0007309
|
John R. Hiller
|
J.R. Hiller (University of Minnesota Duluth)
|
Calculations with DLCQ
|
7 pages; LaTeX2e, elsart.cls; to appear in the proceedings of the
Tenth International Light-Cone Meeting on Nonperturbative QCD and Hadron
Phenomenology, Heidelberg, June 12-17, 2000
|
Nucl.Phys.Proc.Suppl. 90 (2000) 170-174
|
10.1016/S0920-5632(00)00891-4
|
UMN-D-00-5
|
hep-ph
| null |
The method of discrete light-cone quantization (DLCQ) and useful refinements
are summarized. Applications to various field theories are reviewed.
|
[
{
"created": "Wed, 26 Jul 2000 22:38:00 GMT",
"version": "v1"
}
] |
2009-10-31
|
[
[
"Hiller",
"J. R.",
"",
"University of Minnesota Duluth"
]
] |
The method of discrete light-cone quantization (DLCQ) and useful refinements are summarized. Applications to various field theories are reviewed.
|
1205.6320
|
Kazem Azizi
|
T. M. Aliev, K. Azizi, M. Savci
|
Mixing angle of doubly heavy baryons in QCD
|
6 Pages
| null |
10.1016/j.physletb.2012.07.033
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We calculate the mixing angles between the spin--1/2,
$\Xi_{bc}$--$\Xi^\prime_{bc}$ and $\Omega_{bc}$--$\Omega^\prime_{bc}$ states of
doubly heavy baryons within the QCD sum rules method. It is found that the
mixing angles are large and have the values $\varphi_{\Xi_{bc}} = 16^0 \pm 5^0$
and $\varphi_{\Omega_{bc}} = 18^0 \pm 6^0$, respectively. The mixing angles are
slightly smaller compared to the predictions of the non--relativistic quark
model, $\varphi_{\Xi_{bc}} = 25.5^0$ and $\varphi_{\Omega_{bc}} = 25.9^0$.
|
[
{
"created": "Tue, 29 May 2012 10:15:45 GMT",
"version": "v1"
},
{
"created": "Sat, 14 Jul 2012 11:56:05 GMT",
"version": "v2"
}
] |
2015-06-05
|
[
[
"Aliev",
"T. M.",
""
],
[
"Azizi",
"K.",
""
],
[
"Savci",
"M.",
""
]
] |
We calculate the mixing angles between the spin--1/2, $\Xi_{bc}$--$\Xi^\prime_{bc}$ and $\Omega_{bc}$--$\Omega^\prime_{bc}$ states of doubly heavy baryons within the QCD sum rules method. It is found that the mixing angles are large and have the values $\varphi_{\Xi_{bc}} = 16^0 \pm 5^0$ and $\varphi_{\Omega_{bc}} = 18^0 \pm 6^0$, respectively. The mixing angles are slightly smaller compared to the predictions of the non--relativistic quark model, $\varphi_{\Xi_{bc}} = 25.5^0$ and $\varphi_{\Omega_{bc}} = 25.9^0$.
|
2311.09315
|
Marco Gorghetto
|
Marco Gorghetto, Edward Hardy, Horia Nicolaescu, Alessio Notari,
Michele Redi
|
Early vs late string networks from a minimal QCD Axion
|
31 pages + appendices
| null | null | null |
hep-ph astro-ph.CO hep-th
|
http://creativecommons.org/licenses/by/4.0/
|
We propose a new regime of minimal QCD axion dark matter that lies between
the pre- and post-inflationary scenarios, such that the Peccei-Quinn (PQ)
symmetry is restored only on sufficiently large spatial scales. This leads to a
novel cosmological evolution, in which strings and domain walls re-enter the
horizon and annihilate later than in the ordinary post-inflationary regime,
possibly even after the QCD crossover. Such dynamics can occur if the PQ
symmetry is restored by inflationary fluctuations, i.e. the Hubble parameter
during inflation $H_I$ is larger than the PQ breaking scale $f_a$, but it is
not thermally restored afterwards. Solving the Fokker-Planck equation, we
estimate the number of inflationary e-folds required for the PQ symmetry to be,
on average, restored. Moreover, we show that, in the large parts of parameter
space where the radial mode is displaced from the minimum by de Sitter
fluctuations, a string network forms due to the radial mode oscillating over
the top of its potential after inflation. In both cases we identify order one
ranges in $H_I/f_a$ and in the quartic coupling $\lambda$ of the PQ potential
that lead to the late-string dynamics. In this regime the cosmological dark
matter abundance can be reproduced for axion decay constants as low as the
astrophysical constraint $O(10^8)$ GeV, corresponding to axion masses up to
$10^{-2}~{\rm eV}$, and with miniclusters with masses as large as
$O(10)M_\odot$.
|
[
{
"created": "Wed, 15 Nov 2023 19:15:20 GMT",
"version": "v1"
},
{
"created": "Tue, 16 Jan 2024 13:15:52 GMT",
"version": "v2"
}
] |
2024-01-17
|
[
[
"Gorghetto",
"Marco",
""
],
[
"Hardy",
"Edward",
""
],
[
"Nicolaescu",
"Horia",
""
],
[
"Notari",
"Alessio",
""
],
[
"Redi",
"Michele",
""
]
] |
We propose a new regime of minimal QCD axion dark matter that lies between the pre- and post-inflationary scenarios, such that the Peccei-Quinn (PQ) symmetry is restored only on sufficiently large spatial scales. This leads to a novel cosmological evolution, in which strings and domain walls re-enter the horizon and annihilate later than in the ordinary post-inflationary regime, possibly even after the QCD crossover. Such dynamics can occur if the PQ symmetry is restored by inflationary fluctuations, i.e. the Hubble parameter during inflation $H_I$ is larger than the PQ breaking scale $f_a$, but it is not thermally restored afterwards. Solving the Fokker-Planck equation, we estimate the number of inflationary e-folds required for the PQ symmetry to be, on average, restored. Moreover, we show that, in the large parts of parameter space where the radial mode is displaced from the minimum by de Sitter fluctuations, a string network forms due to the radial mode oscillating over the top of its potential after inflation. In both cases we identify order one ranges in $H_I/f_a$ and in the quartic coupling $\lambda$ of the PQ potential that lead to the late-string dynamics. In this regime the cosmological dark matter abundance can be reproduced for axion decay constants as low as the astrophysical constraint $O(10^8)$ GeV, corresponding to axion masses up to $10^{-2}~{\rm eV}$, and with miniclusters with masses as large as $O(10)M_\odot$.
|
1201.4101
|
Micha{\l} Ochman
|
Jacek Holeczek, Michal Ochman, Elzbieta Stephan, Marek Zralek
|
Physics Beyond Standard Model in Neutron Beta Decay
|
6 pages, 6 figures, presented at the XXXV International Conference of
Theoretical Physics "Matter to the Deepest 2011", Ustron, Poland, September
12-18, 2011
|
Acta Phys.Polon.B42:2493-2499,2011
|
10.5506/APhysPolB.42.2493
| null |
hep-ph nucl-ex nucl-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Limits from neutron beta decay on parameters describing physics beyond the
Standard Model are presented. New Physics is described by the most general
Lorentz invariant effective Hamiltonian involving vector, scalar and tensor
operators and Standard Model fields only. Two-parameter fits to the decay
parameters measured in free neutron beta decay have been done, in some cases
indicating rather big dependence of the results on g_A/g_V ratio of nucleon
form factors at zero four-momentum transfer.
|
[
{
"created": "Thu, 19 Jan 2012 16:41:06 GMT",
"version": "v1"
}
] |
2012-01-20
|
[
[
"Holeczek",
"Jacek",
""
],
[
"Ochman",
"Michal",
""
],
[
"Stephan",
"Elzbieta",
""
],
[
"Zralek",
"Marek",
""
]
] |
Limits from neutron beta decay on parameters describing physics beyond the Standard Model are presented. New Physics is described by the most general Lorentz invariant effective Hamiltonian involving vector, scalar and tensor operators and Standard Model fields only. Two-parameter fits to the decay parameters measured in free neutron beta decay have been done, in some cases indicating rather big dependence of the results on g_A/g_V ratio of nucleon form factors at zero four-momentum transfer.
|
1101.4148
|
Yu-Feng Zhou
|
Ze-Peng Liu, Yue-Liang Wu and Yu-Feng Zhou
|
Enhancement of dark matter relic density from the late time dark matter
conversions
|
15 pages, 3 figures, version to appear in Eur.Phys.J.C
|
Eur.Phys.J.C71:1749,2011
|
10.1140/epjc/s10052-011-1749-4
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We demonstrate that if the dark matter (DM) in the Universe contains multiple
components,the interactions between the DM components may induce DM
conversions. It is then possible that the lightest DM component with an
annihilation cross section much larger than that of the typical weakly
interacting massive particle (WIMP) can obtain a relic density in consistent
with the cosmological observations, due to an enhancement from the DM
conversion process at late time after the thermal decoupling. This provides an
alternative source of large boost factor required to explain the excesses
reported by the recent DM indirect search experiments.
|
[
{
"created": "Fri, 21 Jan 2011 14:44:21 GMT",
"version": "v1"
},
{
"created": "Tue, 1 Feb 2011 08:26:52 GMT",
"version": "v2"
},
{
"created": "Fri, 9 Sep 2011 12:15:21 GMT",
"version": "v3"
}
] |
2011-10-11
|
[
[
"Liu",
"Ze-Peng",
""
],
[
"Wu",
"Yue-Liang",
""
],
[
"Zhou",
"Yu-Feng",
""
]
] |
We demonstrate that if the dark matter (DM) in the Universe contains multiple components,the interactions between the DM components may induce DM conversions. It is then possible that the lightest DM component with an annihilation cross section much larger than that of the typical weakly interacting massive particle (WIMP) can obtain a relic density in consistent with the cosmological observations, due to an enhancement from the DM conversion process at late time after the thermal decoupling. This provides an alternative source of large boost factor required to explain the excesses reported by the recent DM indirect search experiments.
|
1404.4564
|
Adam Alloul
|
Adam Alloul
|
Top-down and bottom-up excursions beyond the Standard Model: The example
of left-right symmetries in supersymmetry
|
Ph.D thesis defended at IPHC (France) on september 20th 2013, 168
pages
| null | null | null |
hep-ph hep-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
In this Ph.D thesis three main projects are presented. In the first one the
phenomenology associated with the neutralinos and charginos sector of the
left-right symmetric supersymmetric model is explored. After a detailed
motivation of the study and construction of such models, it is shown that these
models can be easily discovered in multi-leptonic final states as they lead to
signatures very different from those induced by the Standard Model or its
supersymmetric version. In the second project, we concentrate on the
phenomenology associated with doubly-charged particles. Starting from the
hypothesis that such a particle is discovered at the LHC, we build several
effective field theories depending on both the representation under SU(2)_L to
which they belong the particle and their spin and perform a Monte Carlo
analysis highlighting some key observables that would help to determine their
quantum numbers. Another part of my thesis, complementary to the phenomenology
work, has consisted in developping computer programs that might be helpful for
phenomenological studies. Working in the framework of the Mathematica package
FeynRules, I took part in the development of a routine able to extract
automatically the analytical expressions of the renormalization group equations
at the two-loop level for any renormalizable supersymmetric model. I have also
been involved in the development of another module of FeynRules able to extract
automatically the analytical expressions for the mass matrices associated to
any model implemented in FeynRules and to export these equations in the form of
a C++ source code able to diagonalize the matrices and store the mixing
matrices as well as the spectrum in an SLHA-compliant file.
|
[
{
"created": "Thu, 17 Apr 2014 15:52:20 GMT",
"version": "v1"
}
] |
2014-04-18
|
[
[
"Alloul",
"Adam",
""
]
] |
In this Ph.D thesis three main projects are presented. In the first one the phenomenology associated with the neutralinos and charginos sector of the left-right symmetric supersymmetric model is explored. After a detailed motivation of the study and construction of such models, it is shown that these models can be easily discovered in multi-leptonic final states as they lead to signatures very different from those induced by the Standard Model or its supersymmetric version. In the second project, we concentrate on the phenomenology associated with doubly-charged particles. Starting from the hypothesis that such a particle is discovered at the LHC, we build several effective field theories depending on both the representation under SU(2)_L to which they belong the particle and their spin and perform a Monte Carlo analysis highlighting some key observables that would help to determine their quantum numbers. Another part of my thesis, complementary to the phenomenology work, has consisted in developping computer programs that might be helpful for phenomenological studies. Working in the framework of the Mathematica package FeynRules, I took part in the development of a routine able to extract automatically the analytical expressions of the renormalization group equations at the two-loop level for any renormalizable supersymmetric model. I have also been involved in the development of another module of FeynRules able to extract automatically the analytical expressions for the mass matrices associated to any model implemented in FeynRules and to export these equations in the form of a C++ source code able to diagonalize the matrices and store the mixing matrices as well as the spectrum in an SLHA-compliant file.
|
1612.01937
|
Dieter M\"uller
|
G. Duplan\v{c}i\'c and D. M\"uller and K. Passek-Kumeri\v{c}ki
|
Next-to-leading order corrections to deeply virtual production of
pseudoscalar mesons
|
13 pages, 2 figures
| null |
10.1016/j.physletb.2017.05.097
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We complete the perturbative next-to-leading order corrections to the hard
scattering amplitudes of deeply virtual meson leptoproduction processes at
leading twist-two level by presenting the results for the production of flavor
singlet pseudoscalar mesons. The new results are given in the common momentum
fraction representation and in terms of conformal moments. We also comment on
the flavor singlet results for deeply virtual vector meson production.
|
[
{
"created": "Tue, 6 Dec 2016 18:16:39 GMT",
"version": "v1"
}
] |
2017-06-14
|
[
[
"Duplančić",
"G.",
""
],
[
"Müller",
"D.",
""
],
[
"Passek-Kumerički",
"K.",
""
]
] |
We complete the perturbative next-to-leading order corrections to the hard scattering amplitudes of deeply virtual meson leptoproduction processes at leading twist-two level by presenting the results for the production of flavor singlet pseudoscalar mesons. The new results are given in the common momentum fraction representation and in terms of conformal moments. We also comment on the flavor singlet results for deeply virtual vector meson production.
|
2006.16931
|
Xiao-Gang He
|
Jin Sun, Xiao-Gang He
|
DFSZ Axion Couplings Revisited
|
Title modified and materials added. Version to appear in PLB
| null |
10.1016/j.physletb.2020.135881
| null |
hep-ph hep-ex
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Among many possibilities, solar axion has been proposed to explain the
electronic recoil events excess observed by Xenon1T collaboration, although it
has tension with astrophysical observations. The axion couplings, to photon
$g_{a\gamma}$ and to electron $g_{ae}$ play important roles. These couplings
are related to the Peccei-Quinn (PQ) charges $X_f$ for fermions. In most of the
calculations, $g_{a\gamma}$ is obtained by normalizing to the ratio of
electromagnetic anomaly factor $E = TrX_f Q^2_f N_c$ ($N_c$ is 3 and 1 for
quarks and charged leptons respectively) and QCD anomaly factor $N = TrX_q
T(q)$ ($T(q)$ is quarks' $SU(3)_c$ index). The broken PQ symmetry generator is
used in the calculation which does not seem to extract out the components of
broken generator in the axion which are "eaten" by the $Z$ boson. However,
using the physical components of axion or the ratio of anomaly factors should
obtain the same results in the DFSZ for $g_{a\gamma}$. When going beyond the
standard DFSZ models, such as variant DFSZ models, where more Higgs doublets
and fermions have different PQ charges, one may wonder if the results are
different. We show that the two methods obtain the same results as expected,
but the axion couplings to quarks and leptons $g_{af}$ (here f indicates one of
the fermions in the SM) are more conveniently calculated in the physical axion
basis. The result depends on the values of the vacuum expectation values
leading to a wider parameter space for $g_{af}$ in beyond the standard DFSZ
axion. We also show explicitly how flavor conserving $g_{af}$ couplings can be
maintained when there are more than one Higgs doublets couple to the up and
down fermion sectors in variant DFSZ models at tree level, and how flavor
violating couplings can arise.
|
[
{
"created": "Tue, 30 Jun 2020 16:01:28 GMT",
"version": "v1"
},
{
"created": "Sun, 5 Jul 2020 08:37:42 GMT",
"version": "v2"
},
{
"created": "Sat, 25 Jul 2020 12:12:52 GMT",
"version": "v3"
},
{
"created": "Tue, 20 Oct 2020 06:03:32 GMT",
"version": "v4"
}
] |
2020-11-04
|
[
[
"Sun",
"Jin",
""
],
[
"He",
"Xiao-Gang",
""
]
] |
Among many possibilities, solar axion has been proposed to explain the electronic recoil events excess observed by Xenon1T collaboration, although it has tension with astrophysical observations. The axion couplings, to photon $g_{a\gamma}$ and to electron $g_{ae}$ play important roles. These couplings are related to the Peccei-Quinn (PQ) charges $X_f$ for fermions. In most of the calculations, $g_{a\gamma}$ is obtained by normalizing to the ratio of electromagnetic anomaly factor $E = TrX_f Q^2_f N_c$ ($N_c$ is 3 and 1 for quarks and charged leptons respectively) and QCD anomaly factor $N = TrX_q T(q)$ ($T(q)$ is quarks' $SU(3)_c$ index). The broken PQ symmetry generator is used in the calculation which does not seem to extract out the components of broken generator in the axion which are "eaten" by the $Z$ boson. However, using the physical components of axion or the ratio of anomaly factors should obtain the same results in the DFSZ for $g_{a\gamma}$. When going beyond the standard DFSZ models, such as variant DFSZ models, where more Higgs doublets and fermions have different PQ charges, one may wonder if the results are different. We show that the two methods obtain the same results as expected, but the axion couplings to quarks and leptons $g_{af}$ (here f indicates one of the fermions in the SM) are more conveniently calculated in the physical axion basis. The result depends on the values of the vacuum expectation values leading to a wider parameter space for $g_{af}$ in beyond the standard DFSZ axion. We also show explicitly how flavor conserving $g_{af}$ couplings can be maintained when there are more than one Higgs doublets couple to the up and down fermion sectors in variant DFSZ models at tree level, and how flavor violating couplings can arise.
|
1005.0617
|
Timothy Dulaney
|
Timothy R. Dulaney (1), Pavel Fileviez Perez (2) and Mark B. Wise (1)
((1) Caltech, (2) Wisconsin U., Madison)
|
Dark Matter, Baryon Asymmetry, and Spontaneous B and L Breaking
|
23 pages, 5 figures; revised version, typos removed, references
added, discussion expanded
|
Phys.Rev.D83:023520,2011
|
10.1103/PhysRevD.83.023520
|
CALT 68-2788
|
hep-ph astro-ph.CO
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We investigate the dark matter and the cosmological baryon asymmetry in a
simple theory where baryon (B) and lepton (L) number are local gauge symmetries
that are spontaneously broken. In this model, the cold dark matter candidate is
the lightest new field with baryon number and its stability is an automatic
consequence of the gauge symmetry. Dark matter annihilation is either through a
leptophobic gauge boson whose mass must be below a TeV or through the Higgs
boson. Since the mass of the leptophobic gauge boson has to be below the TeV
scale one finds that in the first scenario there is a lower bound on the
elastic cross section of about 5x10^{-46} cm^2. Even though baryon number is
gauged and not spontaneously broken until the weak scale, a cosmologically
acceptable baryon excess is possible. There is tension between achieving both
the measured baryon excess and the dark matter density.
|
[
{
"created": "Tue, 4 May 2010 20:00:01 GMT",
"version": "v1"
},
{
"created": "Tue, 11 May 2010 17:02:06 GMT",
"version": "v2"
},
{
"created": "Thu, 24 Jun 2010 17:48:55 GMT",
"version": "v3"
},
{
"created": "Wed, 29 Sep 2010 22:04:43 GMT",
"version": "v4"
}
] |
2015-03-17
|
[
[
"Dulaney",
"Timothy R.",
"",
"Caltech"
],
[
"Perez",
"Pavel Fileviez",
"",
"Wisconsin U., Madison"
],
[
"Wise",
"Mark B.",
"",
"Caltech"
]
] |
We investigate the dark matter and the cosmological baryon asymmetry in a simple theory where baryon (B) and lepton (L) number are local gauge symmetries that are spontaneously broken. In this model, the cold dark matter candidate is the lightest new field with baryon number and its stability is an automatic consequence of the gauge symmetry. Dark matter annihilation is either through a leptophobic gauge boson whose mass must be below a TeV or through the Higgs boson. Since the mass of the leptophobic gauge boson has to be below the TeV scale one finds that in the first scenario there is a lower bound on the elastic cross section of about 5x10^{-46} cm^2. Even though baryon number is gauged and not spontaneously broken until the weak scale, a cosmologically acceptable baryon excess is possible. There is tension between achieving both the measured baryon excess and the dark matter density.
|
1307.6499
|
Antonio Enrique C\'arcamo Hern\'andez acarcamo
|
A. E. C\'arcamo Hern\'andez, Ivo de Medeiros Varzielas, S.G.
Kovalenko, H. P\"as, Iv\'an Schmidt
|
Lepton masses and mixings in a $A_{4}$ multi-Higgs model with radiative
seesaw mechanism
|
15 pages, 1 figure; acknowledgements modified. Version for
publication in Physical Review D
|
Phys. Rev. D 88, 076014 (2013)
|
10.1103/PhysRevD.88.076014
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We propose a renormalizable multi-Higgs model with $A_{4}\otimes Z_{2}\otimes
Z^{\prime}_{2}$ symmetry, accounting for the experimental deviation from the
tribimaximal mixing pattern of the neutrino mixing matrix. In this framework we
study the charged lepton and neutrino masses and mixings. The light neutrino
masses are generated via a radiative seesaw mechanism, which involves a single
heavy Majorana neutrino and neutral scalars running in the loops. The obtained
neutrino mixings and mass squared splittings are in good agreement with the
neutrino oscillation experimental data for both normal and inverted hierarchy.
The model predicts an effective Majorana neutrino mass $m_{\beta\beta}=$ 4 meV
and 50 meV for the normal and the inverted neutrino spectrum, respectively. The
model also features a suppression of CP violation in neutrino oscillations, a
low scale for the heavy Majorana neutrino (few TeV) and, due to the unbroken
$Z_2$ symmetry, a natural dark matter candidate.
|
[
{
"created": "Wed, 24 Jul 2013 17:23:14 GMT",
"version": "v1"
},
{
"created": "Wed, 16 Oct 2013 17:47:54 GMT",
"version": "v2"
},
{
"created": "Mon, 21 Oct 2013 15:17:51 GMT",
"version": "v3"
}
] |
2013-11-13
|
[
[
"Hernández",
"A. E. Cárcamo",
""
],
[
"Varzielas",
"Ivo de Medeiros",
""
],
[
"Kovalenko",
"S. G.",
""
],
[
"Päs",
"H.",
""
],
[
"Schmidt",
"Iván",
""
]
] |
We propose a renormalizable multi-Higgs model with $A_{4}\otimes Z_{2}\otimes Z^{\prime}_{2}$ symmetry, accounting for the experimental deviation from the tribimaximal mixing pattern of the neutrino mixing matrix. In this framework we study the charged lepton and neutrino masses and mixings. The light neutrino masses are generated via a radiative seesaw mechanism, which involves a single heavy Majorana neutrino and neutral scalars running in the loops. The obtained neutrino mixings and mass squared splittings are in good agreement with the neutrino oscillation experimental data for both normal and inverted hierarchy. The model predicts an effective Majorana neutrino mass $m_{\beta\beta}=$ 4 meV and 50 meV for the normal and the inverted neutrino spectrum, respectively. The model also features a suppression of CP violation in neutrino oscillations, a low scale for the heavy Majorana neutrino (few TeV) and, due to the unbroken $Z_2$ symmetry, a natural dark matter candidate.
|
2303.05409
|
Jonathan Ronca
|
J. Baglio, F. Campanario, S. Glaus, M. M\"uhlleitner, J. Ronca and M.
Spira
|
Full NLO QCD predictions for Higgs-pair production in the
2-Higgs-Doublet Model
|
13 pages, 10 figures. V2: minor typos corrected, identical to
published version
|
Eur. Phys. J. C 83, 9, 826 (2023)
|
10.1140/epjc/s10052-023-11957-2
|
CERN-TH-2022-108, IFIC/23-08, KA-TP-02-2023, P3H-23-013, PSI-PR-23-6
|
hep-ph hep-ex
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
After the discovery of the Higgs boson in 2012 at the CERN Large Hadron
Collider (LHC), the study of its properties still leaves room for an extended
Higgs sector with more than one Higgs boson. 2-Higgs Doublet Models (2HDMs) are
well-motivated extensions of the Standard Model (SM) with five physical Higgs
bosons: two CP-even states $h$ and $H$, one CP-odd state $A$, and two charged
states $H^\pm_{}$. In this letter, we present the calculation of the full
next-to-leading order (NLO) QCD corrections to $hH$ and $AA$ production at the
LHC in the 2HDM at small values of the ratio of the vacuum expectation values,
$\tan\beta$, including the exact top-mass dependence everywhere in the
calculation. Using techniques applied in the NLO QCD SM Higgs pair production
calculation, we present results for the total cross section as well as for the
invariant Higgs-pair-mass distribution at the LHC. We also provide the
top-quark scale and scheme uncertainties which are found to be sizeable.
|
[
{
"created": "Thu, 9 Mar 2023 16:53:04 GMT",
"version": "v1"
},
{
"created": "Thu, 28 Sep 2023 08:42:45 GMT",
"version": "v2"
}
] |
2023-09-29
|
[
[
"Baglio",
"J.",
""
],
[
"Campanario",
"F.",
""
],
[
"Glaus",
"S.",
""
],
[
"Mühlleitner",
"M.",
""
],
[
"Ronca",
"J.",
""
],
[
"Spira",
"M.",
""
]
] |
After the discovery of the Higgs boson in 2012 at the CERN Large Hadron Collider (LHC), the study of its properties still leaves room for an extended Higgs sector with more than one Higgs boson. 2-Higgs Doublet Models (2HDMs) are well-motivated extensions of the Standard Model (SM) with five physical Higgs bosons: two CP-even states $h$ and $H$, one CP-odd state $A$, and two charged states $H^\pm_{}$. In this letter, we present the calculation of the full next-to-leading order (NLO) QCD corrections to $hH$ and $AA$ production at the LHC in the 2HDM at small values of the ratio of the vacuum expectation values, $\tan\beta$, including the exact top-mass dependence everywhere in the calculation. Using techniques applied in the NLO QCD SM Higgs pair production calculation, we present results for the total cross section as well as for the invariant Higgs-pair-mass distribution at the LHC. We also provide the top-quark scale and scheme uncertainties which are found to be sizeable.
|
hep-ph/0402051
|
Byung-Yoon Park
|
Byung-Yoon Park, Hee-Jung Lee, Vicente Vento, Joon-Il Kim, Dong-Pil
Min and Mannque Rho
|
Topological Structure of Dense Hadronic Matter
|
13 pages, 8 figures, Talk given at the KIAS-APCTP Symposium in
Astro-Hadron Physics "Compact Stars: Quest for New States of Dense Matter",
November 10-14, 2003, Seoul, Korea, published by World Scientific. Based on
talk by B.-Y. Park
| null |
10.1142/9789812702524_0022
| null |
hep-ph nucl-th
| null |
We present a summary of work done on dense hadronic matter, based on the
Skyrme model, which provides a unified approach to high density, valid in the
large $N_c$ limit. In our picture, dense hadronic matter is described by the
{\em classical} soliton configuration with minimum energy for the given baryon
number density. By incorporating the meson fluctuations on such ground state we
obtain an effective Lagrangian for meson dynamics in a dense medium. Our
starting point has been the Skyrme model defined in terms of pions, thereafter
we have extended and improved the model by incorporating other degrees of
freedom such as dilaton, kaons and vector mesons.
|
[
{
"created": "Thu, 5 Feb 2004 04:17:25 GMT",
"version": "v1"
}
] |
2017-08-23
|
[
[
"Park",
"Byung-Yoon",
""
],
[
"Lee",
"Hee-Jung",
""
],
[
"Vento",
"Vicente",
""
],
[
"Kim",
"Joon-Il",
""
],
[
"Min",
"Dong-Pil",
""
],
[
"Rho",
"Mannque",
""
]
] |
We present a summary of work done on dense hadronic matter, based on the Skyrme model, which provides a unified approach to high density, valid in the large $N_c$ limit. In our picture, dense hadronic matter is described by the {\em classical} soliton configuration with minimum energy for the given baryon number density. By incorporating the meson fluctuations on such ground state we obtain an effective Lagrangian for meson dynamics in a dense medium. Our starting point has been the Skyrme model defined in terms of pions, thereafter we have extended and improved the model by incorporating other degrees of freedom such as dilaton, kaons and vector mesons.
|
2109.03033
|
Andr\`ee Dafne Bolognino
|
Andr\`ee Dafne Bolognino
|
From semi-hard processes to the unintegrated gluon distribution: a
phenomenological path in the high-energy framework
|
195 pages, 48 figures, PhD thesis
| null | null | null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
The class of semi-hard reactions represents a promising venue where to
enhance our knowledge of strong interactions and deepen the aspects related to
this theory in kinematical regimes so far unexplored. In particular, the high
energies reached in electron-proton and in proton-proton collisions first at
HERA and then at the LHC, allow us to study scattering amplitudes of hard and
semi-hard processes in perturbative QCD. The structure of this thesis can be
considered twofold. On one hand, the possibility to distinguish those channels
where at least two final-state particles are emitted with large separation in
rapidity and with an untagged system, permits to test the BFKL dynamics as
resummation energy logarithms in the $t$-channel. In the BFKL formalism, the
Mueller--Navelet jets process has been one of the most investigated reactions.
With the idea of deepening our understanding of the BFKL approach, a new
channel is proposed: the inclusive production of a light charged hadron and a
jet with high transverse momentum widely separated in rapidity. The importance
of this process relies in the possibility to probe a complementary region to
one analyzed for the Mueller--Navelet jets. Additionally, another reaction is
proposed: the heavy-quark pairs hadroproduction. On the other hand, also the
class of processes featured by the detection of a single forward object in
lepton-proton collision offers the opportunity to develop intriguing
phenomenological studies. In particular, the exclusive leptoproduction of light
vector mesons, $\rho$ and $\phi$, is exhaustively investigated. In this
context, the study of helicity-dependent observables allows us to discriminate
among several unintegrated gluon distribution models, whose original definition
naturally encodes the BFKL-equation evolution dynamics. This kind of parton
density allows us to get access to the hadronic structure at small-$x$.
|
[
{
"created": "Tue, 7 Sep 2021 12:21:05 GMT",
"version": "v1"
}
] |
2021-09-08
|
[
[
"Bolognino",
"Andrèe Dafne",
""
]
] |
The class of semi-hard reactions represents a promising venue where to enhance our knowledge of strong interactions and deepen the aspects related to this theory in kinematical regimes so far unexplored. In particular, the high energies reached in electron-proton and in proton-proton collisions first at HERA and then at the LHC, allow us to study scattering amplitudes of hard and semi-hard processes in perturbative QCD. The structure of this thesis can be considered twofold. On one hand, the possibility to distinguish those channels where at least two final-state particles are emitted with large separation in rapidity and with an untagged system, permits to test the BFKL dynamics as resummation energy logarithms in the $t$-channel. In the BFKL formalism, the Mueller--Navelet jets process has been one of the most investigated reactions. With the idea of deepening our understanding of the BFKL approach, a new channel is proposed: the inclusive production of a light charged hadron and a jet with high transverse momentum widely separated in rapidity. The importance of this process relies in the possibility to probe a complementary region to one analyzed for the Mueller--Navelet jets. Additionally, another reaction is proposed: the heavy-quark pairs hadroproduction. On the other hand, also the class of processes featured by the detection of a single forward object in lepton-proton collision offers the opportunity to develop intriguing phenomenological studies. In particular, the exclusive leptoproduction of light vector mesons, $\rho$ and $\phi$, is exhaustively investigated. In this context, the study of helicity-dependent observables allows us to discriminate among several unintegrated gluon distribution models, whose original definition naturally encodes the BFKL-equation evolution dynamics. This kind of parton density allows us to get access to the hadronic structure at small-$x$.
|
hep-ph/9401298
| null |
I. Bigi, B. Blok, M. Shifman, N. Uraltsev, A. Vainshtein
|
Non-Leptonic Decays of Beauty Hadrons -- from Phenomenology to Theory
|
26 pages + 2 PS figures attached. To appear in the second edition of
the book `B Decays', S.Stone (ed.), World Scientific (Replaces the wrong
LaTeX input with apologies for inconvenience)
| null | null |
CERN-TH.7132/94; TPI-MINN-94/1-T, UMN-TH-1234/94, UND-HEP-94-BIG01,
TECHNION-PH-94-1
|
hep-ph
| null |
`Anyone who keeps the ability to see beauty never grows old' Franz Kafka.
In the last few years considerable progress has been achieved in our
understanding of the decays of heavy flavour hadrons. One can now calculate
inclusive transition rates in QCD proper through an expansion in inverse powers
of the heavy flavour quark mass without recourse to phenomenological
assumptions. The non-perturbative contributions are treated systematically in
this way; they are found to produce corrections of order a few percent in
beauty decays, i.e. typically somewhat smaller than the perturbative
corrections. One finds, among other things: (a) The lifetime of $B^-$ mesons is
predicted to be longer than that of $B^0$ mesons by several percent. (b) The
QCD prediction for the semileptonic branching ratio of $B$ mesons appears to
exceed present experimental values. We discuss the implications of this
discrepancy. The phenomenological engineering that has been developed for the
description of {\em exclusive} two-body modes of $B$ mesons has reached a
mature stage and awaits more precise and detailed experimental tests. First
steps towards a genuine QCD treatment of these modes are being made.
|
[
{
"created": "Thu, 20 Jan 1994 21:35:19 GMT",
"version": "v1"
},
{
"created": "Fri, 21 Jan 1994 23:43:56 GMT",
"version": "v2"
}
] |
2009-09-25
|
[
[
"Bigi",
"I.",
""
],
[
"Blok",
"B.",
""
],
[
"Shifman",
"M.",
""
],
[
"Uraltsev",
"N.",
""
],
[
"Vainshtein",
"A.",
""
]
] |
`Anyone who keeps the ability to see beauty never grows old' Franz Kafka. In the last few years considerable progress has been achieved in our understanding of the decays of heavy flavour hadrons. One can now calculate inclusive transition rates in QCD proper through an expansion in inverse powers of the heavy flavour quark mass without recourse to phenomenological assumptions. The non-perturbative contributions are treated systematically in this way; they are found to produce corrections of order a few percent in beauty decays, i.e. typically somewhat smaller than the perturbative corrections. One finds, among other things: (a) The lifetime of $B^-$ mesons is predicted to be longer than that of $B^0$ mesons by several percent. (b) The QCD prediction for the semileptonic branching ratio of $B$ mesons appears to exceed present experimental values. We discuss the implications of this discrepancy. The phenomenological engineering that has been developed for the description of {\em exclusive} two-body modes of $B$ mesons has reached a mature stage and awaits more precise and detailed experimental tests. First steps towards a genuine QCD treatment of these modes are being made.
|
hep-ph/9309210
|
Juan Carlos Montero
|
J. C. Montero and V. Pleitez
|
Constraints on spin-3/2 and excited spin-1/2 fermions coming from the
leptonic Z0-partial width
|
Typeset using REVTEX 2.0, 9 pages and 3 figures (available upon
request)
|
Phys.Lett. B321 (1994) 267-270
|
10.1016/0370-2693(94)90475-8
|
IFT-P.055/93
|
hep-ph
| null |
We consider effective interactions among excited spin-1/2 and spin-3/2
leptons with the usual ones. Assuming that these new leptons are lighter than
the Z0 we will study the constraints on their masses and compositeness scale
coming from the leptonic Z0 partial width.
|
[
{
"created": "Wed, 1 Sep 1993 16:00:00 GMT",
"version": "v1"
}
] |
2009-10-22
|
[
[
"Montero",
"J. C.",
""
],
[
"Pleitez",
"V.",
""
]
] |
We consider effective interactions among excited spin-1/2 and spin-3/2 leptons with the usual ones. Assuming that these new leptons are lighter than the Z0 we will study the constraints on their masses and compositeness scale coming from the leptonic Z0 partial width.
|
hep-ph/9610488
|
Meng Ta-Chung
|
C. Boros, Liang Zuo-tang and Meng Ta-chung
|
Spin-effects and dissociation of space-like photons
| null | null | null | null |
hep-ph
| null |
Talk presented by Meng Ta-chung at the 12th International Symposium on High
Energy Spin Physics, SPIN96, Amsterdam, September 10-14,1996.
|
[
{
"created": "Fri, 25 Oct 1996 12:35:25 GMT",
"version": "v1"
}
] |
2007-05-23
|
[
[
"Boros",
"C.",
""
],
[
"Zuo-tang",
"Liang",
""
],
[
"Ta-chung",
"Meng",
""
]
] |
Talk presented by Meng Ta-chung at the 12th International Symposium on High Energy Spin Physics, SPIN96, Amsterdam, September 10-14,1996.
|
2212.02534
|
Samadrita Mukherjee
|
Triparno Bandyopadhyay, Ankita Budhraja, Samadrita Mukherjee, Tuhin S.
Roy
|
A twisted tale of the transverse-mass tail
|
24 pages, 7 figures, a new appendix added, version published in JHEP
|
JHEP08(2023)135
|
10.1007/JHEP08(2023)135
|
TIFR/TH/23-4
|
hep-ph hep-ex
|
http://creativecommons.org/licenses/by/4.0/
|
We propose a tantalizing possibility that misinterpretation of the
reconstructed missing momentum may have yielded the observed discrepancies
among measurements of the $W$-mass in different collider experiments. We
introduce a proof-of-principle scenario characterized by a new physics
particle, which can be produced associated with the $W$-boson in hadron
collisions and contributes to the net missing momentum observed in a detector.
We show that these exotic events pass the selection criteria imposed by various
collaborations at reasonably high rates. Consequently, in the presence of even
a handful of these events, a fit based on the ansatz that the missing momentum
is primarily due to neutrinos (as it happens in the Standard Model), yields a
$W$-boson mass that differs from its true value. Moreover, the best fit mass
depends on the nature of the collider and the center-of-mass energy of
collisions. We construct a barebones model that demonstrates this possibility
quantitatively while satisfying current constraints. Interestingly, we find
that the nature of the new physics particle and its interactions appear as a
variation of the physics of Axion-like particles after a field redefinition.
|
[
{
"created": "Mon, 5 Dec 2022 19:00:37 GMT",
"version": "v1"
},
{
"created": "Tue, 22 Aug 2023 09:03:50 GMT",
"version": "v2"
}
] |
2023-08-23
|
[
[
"Bandyopadhyay",
"Triparno",
""
],
[
"Budhraja",
"Ankita",
""
],
[
"Mukherjee",
"Samadrita",
""
],
[
"Roy",
"Tuhin S.",
""
]
] |
We propose a tantalizing possibility that misinterpretation of the reconstructed missing momentum may have yielded the observed discrepancies among measurements of the $W$-mass in different collider experiments. We introduce a proof-of-principle scenario characterized by a new physics particle, which can be produced associated with the $W$-boson in hadron collisions and contributes to the net missing momentum observed in a detector. We show that these exotic events pass the selection criteria imposed by various collaborations at reasonably high rates. Consequently, in the presence of even a handful of these events, a fit based on the ansatz that the missing momentum is primarily due to neutrinos (as it happens in the Standard Model), yields a $W$-boson mass that differs from its true value. Moreover, the best fit mass depends on the nature of the collider and the center-of-mass energy of collisions. We construct a barebones model that demonstrates this possibility quantitatively while satisfying current constraints. Interestingly, we find that the nature of the new physics particle and its interactions appear as a variation of the physics of Axion-like particles after a field redefinition.
|
hep-ph/9504363
|
Hyun-Chul Kim
|
Hyun-Chul Kim, Andree Blotz, Maxim V. Polyakov and Klaus Goeke
|
Electromagnetic Form Factors of the SU(3) Octet Baryons in the
semibosonized SU(3) Nambu-Jona-Lasinio Model
|
RevTex is used. 37 pages. The final version to appear in Phys. Rev.
D. 13 figures are included
|
Phys.Rev.D53:4013-4029,1996
|
10.1103/PhysRevD.53.4013
|
RUB-TPII-7/95
|
hep-ph
| null |
The electromagnetic form factors of the SU(3) octet baryons are investigated
in the semibosonized SU(3) Nambu--Jona-Lasinio model (chiral quark-soliton
model). The rotational $1/N_c$ and strange quark mass corrections in linear
order are taken into account. The electromagnetic charge radii of the nucleon
and magnetic moments are also evaluated. It turns out that the model is in a
remarkable good agreement with the experimental data.
|
[
{
"created": "Sat, 22 Apr 1995 10:48:34 GMT",
"version": "v1"
},
{
"created": "Thu, 30 Nov 1995 17:32:36 GMT",
"version": "v2"
},
{
"created": "Fri, 1 Dec 1995 09:15:14 GMT",
"version": "v3"
}
] |
2014-11-17
|
[
[
"Kim",
"Hyun-Chul",
""
],
[
"Blotz",
"Andree",
""
],
[
"Polyakov",
"Maxim V.",
""
],
[
"Goeke",
"Klaus",
""
]
] |
The electromagnetic form factors of the SU(3) octet baryons are investigated in the semibosonized SU(3) Nambu--Jona-Lasinio model (chiral quark-soliton model). The rotational $1/N_c$ and strange quark mass corrections in linear order are taken into account. The electromagnetic charge radii of the nucleon and magnetic moments are also evaluated. It turns out that the model is in a remarkable good agreement with the experimental data.
|
hep-ph/0108112
|
Graham Ross
|
S. F. King and G. G. Ross
|
Fermion Masses and Mixing Angles from SU(3) Family Symmetry
|
Minor changes. Version to appear in Phys.Lett B. 16 pages, latex
|
Phys.Lett. B520 (2001) 243-253
|
10.1016/S0370-2693(01)01139-X
| null |
hep-ph
| null |
We propose a model based on SU(3) family symmetry which leads to a successful
description of quark and lepton masses and mixing angles including approximate
bi-maximal mixing in the neutrino sector suitable for the LOW or quasi-vacuum
solar solutions, with the atmospheric angle predicted to be accurately maximal
due to the SU(3) symmetry. The model predicts a CHOOZ angle $\theta_{13}\sim
|V_{ub}|.$ The SU(3) symmetry can also ensure the near degeneracy of squarks
and sleptons needed to avoid large flavour changing neutral currents.
|
[
{
"created": "Mon, 13 Aug 2001 17:42:08 GMT",
"version": "v1"
},
{
"created": "Wed, 15 Aug 2001 17:41:15 GMT",
"version": "v2"
},
{
"created": "Tue, 25 Sep 2001 11:36:15 GMT",
"version": "v3"
}
] |
2009-11-07
|
[
[
"King",
"S. F.",
""
],
[
"Ross",
"G. G.",
""
]
] |
We propose a model based on SU(3) family symmetry which leads to a successful description of quark and lepton masses and mixing angles including approximate bi-maximal mixing in the neutrino sector suitable for the LOW or quasi-vacuum solar solutions, with the atmospheric angle predicted to be accurately maximal due to the SU(3) symmetry. The model predicts a CHOOZ angle $\theta_{13}\sim |V_{ub}|.$ The SU(3) symmetry can also ensure the near degeneracy of squarks and sleptons needed to avoid large flavour changing neutral currents.
|
hep-ph/9504241
|
Mariano Quiros
|
J.R. Espinosa (DESY) and M. Quiros (CERN)
|
IMPROVED METASTABILITY BOUNDS ON THE STANDARD MODEL HIGGS MASS
|
23 pages, Latex + pssfig.sty, 9 uuencoded tar-compressed figures in
file fig.uu
|
Phys.Lett.B353:257-266,1995
|
10.1016/0370-2693(95)00572-3
|
CERN-TH/95-18, DESY 95-039
|
hep-ph
| null |
Depending on the Higgs-boson and top-quark masses, $M_H$ and $M_t$, the
effective potential of the Standard Model at finite (and zero) temperature can
have a deep and unphysical stable minimum $\langle \phi(T)\rangle$ at values of
the field much larger than $G_F^{-1/2}$. We have computed absolute lower bounds
on $M_H$, as a function of $M_t$, imposing the condition of no decay by thermal
fluctuations, or quantum tunnelling, to the stable minimum. Our effective
potential at zero temperature includes all next-to-leading logarithmic
corrections (making it extremely scale-independent), and we have used pole
masses for the Higgs-boson and top-quark. Thermal corrections to the effective
potential include plasma effects by one-loop ring resummation of Debye masses.
All calculations, including the effective potential and the bubble nucleation
rate, are performed numerically, and so the results do not rely on any kind of
analytical approximation. Easy-to-use fits are provided for the benefit of the
reader. Conclusions on the possible Higgs detection at LEP-200 are drawn.
|
[
{
"created": "Thu, 6 Apr 1995 09:58:03 GMT",
"version": "v1"
}
] |
2010-04-06
|
[
[
"Espinosa",
"J. R.",
"",
"DESY"
],
[
"Quiros",
"M.",
"",
"CERN"
]
] |
Depending on the Higgs-boson and top-quark masses, $M_H$ and $M_t$, the effective potential of the Standard Model at finite (and zero) temperature can have a deep and unphysical stable minimum $\langle \phi(T)\rangle$ at values of the field much larger than $G_F^{-1/2}$. We have computed absolute lower bounds on $M_H$, as a function of $M_t$, imposing the condition of no decay by thermal fluctuations, or quantum tunnelling, to the stable minimum. Our effective potential at zero temperature includes all next-to-leading logarithmic corrections (making it extremely scale-independent), and we have used pole masses for the Higgs-boson and top-quark. Thermal corrections to the effective potential include plasma effects by one-loop ring resummation of Debye masses. All calculations, including the effective potential and the bubble nucleation rate, are performed numerically, and so the results do not rely on any kind of analytical approximation. Easy-to-use fits are provided for the benefit of the reader. Conclusions on the possible Higgs detection at LEP-200 are drawn.
|
2310.20631
|
Cameron Parker
|
Cameron Parker, Aaron Angerami, Ritu Arora, Steffen Bass, Shanshan
Cao, Yi Chen, Raymond Ehlers, Hannah Elfner, Wenkai Fan, Rainer J. Fries,
Charles Gale, Yayun He, Ulrich Heinz, Barbara Jacak, Peter Jacobs, Sangyong
Jeon, Yi Ji, Lauren Kasper, Michael Kordell II, Amit Kumar, Joseph Latessa,
Yen-Jie Lee, Roy Lemmon, Dananjaya Liyanage, Arthur Lopez, Matt Luzum,
Abhijit Majumder, Simon Mak, Andi Mankolli, Christal Martin, Haydar Mehryar,
Tanner Mengel, James Mulligan, Christine Nattrass, Jaime Norman,
Jean-Francois Paquet, Joern H. Putschke, Gunther Roland, Bjoern Schenke,
Loren Schwiebert, Arjun Sengupta, Chun Shen, Chathuranga Sirimanna, Ron A.
Soltz, Ismail Soudi, Michael Strickland, Yasuki Tachibana, Julia Velkovska,
Gojko Vujanovic, Xin-Nian Wang, Wenbin Zhao (The JETSCAPE Collaboration)
|
Hybrid Hadronization of Jet Showers from $e^++e^-$ to $A+A$ with
JETSCAPE
|
6 pages, 4 figures, Hard Probes 2023 conference, accepted for
publication in Proceedings of Science: version 2, references added, typos
fixed
| null | null | null |
hep-ph nucl-ex nucl-th
|
http://creativecommons.org/licenses/by/4.0/
|
In this talk we review jet production in a large variety of collision systems
using the JETSCAPE event generator and Hybrid Hadronization. Hybrid
Hadronization combines quark recombination, applicable when distances between
partons in phase space are small, and string fragmentation appropriate for
dilute parton systems. It can therefore smoothly describe the transition from
very dilute parton systems like $e^++e^-$ to full $A+A$ collisions. We test
this picture by using JETSCAPE to generate jets in various systems. Comparison
to experimental data in $e^++e^-$ and $p+p$ collisions allows for a precise
tuning of vacuum baseline parameters in JETSCAPE and Hybrid Hadronization.
Proceeding to systems with jets embedded in a medium, we study in-medium
hadronization for jet showers. We quantify the effects of an ambient medium,
focusing in particular on the dependence on the collective flow and size of the
medium. Our results clarify the effects we expect from in-medium hadronization
of jets on observables like fragmentation functions, hadron chemistry and jet
shape.
|
[
{
"created": "Tue, 31 Oct 2023 17:00:01 GMT",
"version": "v1"
},
{
"created": "Fri, 3 Nov 2023 16:06:19 GMT",
"version": "v2"
},
{
"created": "Tue, 7 Nov 2023 21:15:03 GMT",
"version": "v3"
}
] |
2023-11-09
|
[
[
"Parker",
"Cameron",
"",
"The JETSCAPE Collaboration"
],
[
"Angerami",
"Aaron",
"",
"The JETSCAPE Collaboration"
],
[
"Arora",
"Ritu",
"",
"The JETSCAPE Collaboration"
],
[
"Bass",
"Steffen",
"",
"The JETSCAPE Collaboration"
],
[
"Cao",
"Shanshan",
"",
"The JETSCAPE Collaboration"
],
[
"Chen",
"Yi",
"",
"The JETSCAPE Collaboration"
],
[
"Ehlers",
"Raymond",
"",
"The JETSCAPE Collaboration"
],
[
"Elfner",
"Hannah",
"",
"The JETSCAPE Collaboration"
],
[
"Fan",
"Wenkai",
"",
"The JETSCAPE Collaboration"
],
[
"Fries",
"Rainer J.",
"",
"The JETSCAPE Collaboration"
],
[
"Gale",
"Charles",
"",
"The JETSCAPE Collaboration"
],
[
"He",
"Yayun",
"",
"The JETSCAPE Collaboration"
],
[
"Heinz",
"Ulrich",
"",
"The JETSCAPE Collaboration"
],
[
"Jacak",
"Barbara",
"",
"The JETSCAPE Collaboration"
],
[
"Jacobs",
"Peter",
"",
"The JETSCAPE Collaboration"
],
[
"Jeon",
"Sangyong",
"",
"The JETSCAPE Collaboration"
],
[
"Ji",
"Yi",
"",
"The JETSCAPE Collaboration"
],
[
"Kasper",
"Lauren",
"",
"The JETSCAPE Collaboration"
],
[
"Kordell",
"Michael",
"II",
"The JETSCAPE Collaboration"
],
[
"Kumar",
"Amit",
"",
"The JETSCAPE Collaboration"
],
[
"Latessa",
"Joseph",
"",
"The JETSCAPE Collaboration"
],
[
"Lee",
"Yen-Jie",
"",
"The JETSCAPE Collaboration"
],
[
"Lemmon",
"Roy",
"",
"The JETSCAPE Collaboration"
],
[
"Liyanage",
"Dananjaya",
"",
"The JETSCAPE Collaboration"
],
[
"Lopez",
"Arthur",
"",
"The JETSCAPE Collaboration"
],
[
"Luzum",
"Matt",
"",
"The JETSCAPE Collaboration"
],
[
"Majumder",
"Abhijit",
"",
"The JETSCAPE Collaboration"
],
[
"Mak",
"Simon",
"",
"The JETSCAPE Collaboration"
],
[
"Mankolli",
"Andi",
"",
"The JETSCAPE Collaboration"
],
[
"Martin",
"Christal",
"",
"The JETSCAPE Collaboration"
],
[
"Mehryar",
"Haydar",
"",
"The JETSCAPE Collaboration"
],
[
"Mengel",
"Tanner",
"",
"The JETSCAPE Collaboration"
],
[
"Mulligan",
"James",
"",
"The JETSCAPE Collaboration"
],
[
"Nattrass",
"Christine",
"",
"The JETSCAPE Collaboration"
],
[
"Norman",
"Jaime",
"",
"The JETSCAPE Collaboration"
],
[
"Paquet",
"Jean-Francois",
"",
"The JETSCAPE Collaboration"
],
[
"Putschke",
"Joern H.",
"",
"The JETSCAPE Collaboration"
],
[
"Roland",
"Gunther",
"",
"The JETSCAPE Collaboration"
],
[
"Schenke",
"Bjoern",
"",
"The JETSCAPE Collaboration"
],
[
"Schwiebert",
"Loren",
"",
"The JETSCAPE Collaboration"
],
[
"Sengupta",
"Arjun",
"",
"The JETSCAPE Collaboration"
],
[
"Shen",
"Chun",
"",
"The JETSCAPE Collaboration"
],
[
"Sirimanna",
"Chathuranga",
"",
"The JETSCAPE Collaboration"
],
[
"Soltz",
"Ron A.",
"",
"The JETSCAPE Collaboration"
],
[
"Soudi",
"Ismail",
"",
"The JETSCAPE Collaboration"
],
[
"Strickland",
"Michael",
"",
"The JETSCAPE Collaboration"
],
[
"Tachibana",
"Yasuki",
"",
"The JETSCAPE Collaboration"
],
[
"Velkovska",
"Julia",
"",
"The JETSCAPE Collaboration"
],
[
"Vujanovic",
"Gojko",
"",
"The JETSCAPE Collaboration"
],
[
"Wang",
"Xin-Nian",
"",
"The JETSCAPE Collaboration"
],
[
"Zhao",
"Wenbin",
"",
"The JETSCAPE Collaboration"
]
] |
In this talk we review jet production in a large variety of collision systems using the JETSCAPE event generator and Hybrid Hadronization. Hybrid Hadronization combines quark recombination, applicable when distances between partons in phase space are small, and string fragmentation appropriate for dilute parton systems. It can therefore smoothly describe the transition from very dilute parton systems like $e^++e^-$ to full $A+A$ collisions. We test this picture by using JETSCAPE to generate jets in various systems. Comparison to experimental data in $e^++e^-$ and $p+p$ collisions allows for a precise tuning of vacuum baseline parameters in JETSCAPE and Hybrid Hadronization. Proceeding to systems with jets embedded in a medium, we study in-medium hadronization for jet showers. We quantify the effects of an ambient medium, focusing in particular on the dependence on the collective flow and size of the medium. Our results clarify the effects we expect from in-medium hadronization of jets on observables like fragmentation functions, hadron chemistry and jet shape.
|
hep-ph/0504029
|
Claudio Destri
|
Claudio Destri and Andrea Sartirana
|
The renormalized and Renormalization-Group invariant Hartree-Fock
approximation
|
32 pages, 13 figures
|
Phys.Rev. D72 (2005) 065003
|
10.1103/PhysRevD.72.065003
|
Bicocca-FT-05-7
|
hep-ph
| null |
We study the renormalization problem for the Hartree--Fock approximation of
the $O(N)-$invariant $\phi^4$ model in the symmetric phase and show how to
systematically improve the corresponding diagrammatic resummation to achieve
the correct renormalization properties of the effective field equations,
including Renormalization--Group invariance with the one--loop beta function.
These new Hartree--Fock dynamics is still of mean field type but includes
memory effects which are generically nonlocal also in space.
|
[
{
"created": "Tue, 5 Apr 2005 15:51:39 GMT",
"version": "v1"
}
] |
2009-11-11
|
[
[
"Destri",
"Claudio",
""
],
[
"Sartirana",
"Andrea",
""
]
] |
We study the renormalization problem for the Hartree--Fock approximation of the $O(N)-$invariant $\phi^4$ model in the symmetric phase and show how to systematically improve the corresponding diagrammatic resummation to achieve the correct renormalization properties of the effective field equations, including Renormalization--Group invariance with the one--loop beta function. These new Hartree--Fock dynamics is still of mean field type but includes memory effects which are generically nonlocal also in space.
|
hep-ph/9608379
|
Brian Harris
|
B. W. Harris (Florida State University)
|
Electroproduction of heavy quarks at NLO
|
To appear in proceedings of the 1996 Meeting of the American Physical
Society, Division of Particles and Fields (DPF 96), Minneapolis, Minnesota,
10-15 Aug 1996. 3 pages, Latex using sprocl.sty (included)
| null | null | null |
hep-ph
| null |
A new next-to-leading order Monte Carlo program for the calculation of fully
differential heavy quark cross sections in electroproduction is described. A
comparison between the theoretical predictions and the latest charm production
data from H1 and ZEUS at HERA is presented.
|
[
{
"created": "Tue, 20 Aug 1996 17:57:41 GMT",
"version": "v1"
}
] |
2007-05-23
|
[
[
"Harris",
"B. W.",
"",
"Florida State University"
]
] |
A new next-to-leading order Monte Carlo program for the calculation of fully differential heavy quark cross sections in electroproduction is described. A comparison between the theoretical predictions and the latest charm production data from H1 and ZEUS at HERA is presented.
|
1412.8352
|
Gui-Jun Ding
|
Peng Chen, Cai-Chang Li and Gui-Jun Ding
|
Lepton Flavor Mixing and CP Symmetry
|
24 pages, 3 figures
|
Phys. Rev. D 91, 033003 (2015)
|
10.1103/PhysRevD.91.033003
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
The strategy of constraining the lepton flavor mixing from remnant CP
symmetry is investigated in a rather general way. The neutrino mass matrix
generally admits four remnant CP transformations which can be derived from the
measured lepton mixing matrix in the charged lepton diagonal basis. Conversely,
the lepton mixing matrix can be reconstructed from the postulated remnant CP
transformations. All mixing angles and CP violating phases can be completely
determined by the full set of remnant CP transformations or three of them. When
one or two remnant CP transformations are preserved, the resulting lepton
mixing matrix would depend on three real parameters or one real parameter
respectively in addition to the parameters characterizing the remnant CP, and
the concrete form of the mixing matrix is presented. The phenomenological
predictions for the mixing parameters are discussed. The conditions leading to
vanishing or maximal Dirac CP violation are studied.
|
[
{
"created": "Mon, 29 Dec 2014 14:30:04 GMT",
"version": "v1"
}
] |
2015-03-05
|
[
[
"Chen",
"Peng",
""
],
[
"Li",
"Cai-Chang",
""
],
[
"Ding",
"Gui-Jun",
""
]
] |
The strategy of constraining the lepton flavor mixing from remnant CP symmetry is investigated in a rather general way. The neutrino mass matrix generally admits four remnant CP transformations which can be derived from the measured lepton mixing matrix in the charged lepton diagonal basis. Conversely, the lepton mixing matrix can be reconstructed from the postulated remnant CP transformations. All mixing angles and CP violating phases can be completely determined by the full set of remnant CP transformations or three of them. When one or two remnant CP transformations are preserved, the resulting lepton mixing matrix would depend on three real parameters or one real parameter respectively in addition to the parameters characterizing the remnant CP, and the concrete form of the mixing matrix is presented. The phenomenological predictions for the mixing parameters are discussed. The conditions leading to vanishing or maximal Dirac CP violation are studied.
|
2012.02508
|
Natsumi Nagata
|
Tomohiro Abe, Koichi Hamaguchi, and Natsumi Nagata
|
Atomic Form Factors and Inverse Primakoff Scattering of Axion
|
15 pages, 3 figures; published version
| null |
10.1016/j.physletb.2021.136174
| null |
hep-ph astro-ph.CO hep-ex
|
http://creativecommons.org/licenses/by/4.0/
|
We reexamine the inverse Primakoff scattering of axions, whose scattering
cross section depends on the distribution of electrons in target atoms. We
evaluate it using a form factor computed with a relativistic Hartree-Fock wave
function and compare it with the previous results obtained with those based on
the screened Coulomb potential for the electrostatic field in the atom. We take
xenon as an example for the target atom and show that the scattering cross
section was overestimated by more than an order of magnitude for axions with
$\lesssim O(10)$ keV energies, like solar axions. It is also found that
inelastic scattering processes, in which the final state contains an excited or
ionized atom, can be comparable or even be dominant when the size of momentum
transfer is $\lesssim 1$ keV. For more energetic axions, on the other hand, the
total scattering cross section is found to be well approximated by a simple
expression and has little dependence on the atomic structure. As an application
of this result, we consider supernova axions, whose energy is 10-100 MeV, and
show that $O(1)$ inverse Primakoff events are expected for axions from a nearby
supernova in the future neutrino experiments, which may warrant a more detailed
study on the search strategy of this process.
|
[
{
"created": "Fri, 4 Dec 2020 10:26:12 GMT",
"version": "v1"
},
{
"created": "Thu, 25 Feb 2021 14:05:20 GMT",
"version": "v2"
}
] |
2021-03-03
|
[
[
"Abe",
"Tomohiro",
""
],
[
"Hamaguchi",
"Koichi",
""
],
[
"Nagata",
"Natsumi",
""
]
] |
We reexamine the inverse Primakoff scattering of axions, whose scattering cross section depends on the distribution of electrons in target atoms. We evaluate it using a form factor computed with a relativistic Hartree-Fock wave function and compare it with the previous results obtained with those based on the screened Coulomb potential for the electrostatic field in the atom. We take xenon as an example for the target atom and show that the scattering cross section was overestimated by more than an order of magnitude for axions with $\lesssim O(10)$ keV energies, like solar axions. It is also found that inelastic scattering processes, in which the final state contains an excited or ionized atom, can be comparable or even be dominant when the size of momentum transfer is $\lesssim 1$ keV. For more energetic axions, on the other hand, the total scattering cross section is found to be well approximated by a simple expression and has little dependence on the atomic structure. As an application of this result, we consider supernova axions, whose energy is 10-100 MeV, and show that $O(1)$ inverse Primakoff events are expected for axions from a nearby supernova in the future neutrino experiments, which may warrant a more detailed study on the search strategy of this process.
|
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