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|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
hep-ph/0312291
|
Hiroyuki Abe
|
Hiroyuki Abe
|
Dynamical symmetry breaking on a brane with bulk gauge theory
|
3 pages, 6 figures, Talk given at Summer Institute '03, Yamanashi,
Japan (12-19 August, 2003); typos corrected, references added
| null | null |
KAIST-TH 2003/16
|
hep-ph hep-th
| null |
We analyze a structure of dynamical chiral symmetry breaking in orbifold
gauge theories with matter fields (fermions) on the fixed point. We find that
the boundary chiral phase structure of QED and QCD on the orbifold is quite
nontrivial depending on the bulk constitution, and we claim that particular
attention should be given to the dynamically generated masses in various kinds
of phenomenological orbifold models.
|
[
{
"created": "Sat, 20 Dec 2003 06:45:38 GMT",
"version": "v1"
},
{
"created": "Tue, 3 Aug 2004 10:19:09 GMT",
"version": "v2"
}
] |
2007-05-23
|
[
[
"Abe",
"Hiroyuki",
""
]
] |
We analyze a structure of dynamical chiral symmetry breaking in orbifold gauge theories with matter fields (fermions) on the fixed point. We find that the boundary chiral phase structure of QED and QCD on the orbifold is quite nontrivial depending on the bulk constitution, and we claim that particular attention should be given to the dynamically generated masses in various kinds of phenomenological orbifold models.
|
hep-ph/0511258
|
Abdessamad Abada
|
A. Abada, N. Daira-Aifa and K. Bouakaz
|
Ultrasoft Quark Damping in Hot QCD
|
16 pages
|
Int.J.Mod.Phys.A21:5317-5332,2006
|
10.1142/S0217751X06033052
| null |
hep-ph
| null |
We determine the quark damping rates in the context of next-to-leading order
hard-thermal-loop summed perturbation of high-temperature QCD where weak
coupling is assumed. The quarks are ultrasoft. Three types of divergent
behavior are encountered: infrared, light-cone and at specific points
determined by the gluon energies. The infrared divergence persists and is
logarithmic whereas the two others are circumvented.
|
[
{
"created": "Tue, 22 Nov 2005 17:18:27 GMT",
"version": "v1"
}
] |
2009-11-11
|
[
[
"Abada",
"A.",
""
],
[
"Daira-Aifa",
"N.",
""
],
[
"Bouakaz",
"K.",
""
]
] |
We determine the quark damping rates in the context of next-to-leading order hard-thermal-loop summed perturbation of high-temperature QCD where weak coupling is assumed. The quarks are ultrasoft. Three types of divergent behavior are encountered: infrared, light-cone and at specific points determined by the gluon energies. The infrared divergence persists and is logarithmic whereas the two others are circumvented.
|
1912.09369
|
Ruud Peeters
|
Dani\"el Boer and Ruud Peeters
|
Fine-tuning and the doublet-triplet splitting problem in the minimal
$SU(5)$ GUT
|
14 pages, 3 figures
| null | null | null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
In this paper we analyse the doublet-triplet splitting problem in the minimal
non-super-symmetric $SU(5)$ GUT. We take into account the full symmetry
breaking pattern with both high scale $SU(5)$ breaking and electroweak symmetry
breaking. Our analysis shows that the only phenomenologically acceptable model
has three vevs, with a strong hierarchy determined by the minimization
conditions. The amount of fine-tuning in the model is then numerically
evaluated by looking at the effect of variation of input parameters on both the
minimization conditions and the bosonic masses. Regarding the vevs as output
parameters, a large amount of fine-tuning is required in this scenario, which
is an expression of the doublet-triplet splitting problem. We show that this
problem is more general, since a model with coupled scalar sectors will in
general never realise a hierarchy in vevs. To avoid these problems we advocate
imposing the desired hierarchy in vevs as part of the theory. We argue for this
viewpoint because the $SU(5)$ breaking and electroweak symmetry breaking need
to be adjusted to each other anyway and cannot be regarded as independent
mechanisms. We suggest that not only the symmetry breaking pattern needs to be
imposed, but also the scales at which the breakings happen. We show
quantitatively that the generic theory with hierarchy imposed does not require
any fine-tuning of the free parameters which can all be natural and
perturbative as desired.
|
[
{
"created": "Thu, 19 Dec 2019 16:53:02 GMT",
"version": "v1"
},
{
"created": "Wed, 29 Apr 2020 12:53:26 GMT",
"version": "v2"
}
] |
2020-04-30
|
[
[
"Boer",
"Daniël",
""
],
[
"Peeters",
"Ruud",
""
]
] |
In this paper we analyse the doublet-triplet splitting problem in the minimal non-super-symmetric $SU(5)$ GUT. We take into account the full symmetry breaking pattern with both high scale $SU(5)$ breaking and electroweak symmetry breaking. Our analysis shows that the only phenomenologically acceptable model has three vevs, with a strong hierarchy determined by the minimization conditions. The amount of fine-tuning in the model is then numerically evaluated by looking at the effect of variation of input parameters on both the minimization conditions and the bosonic masses. Regarding the vevs as output parameters, a large amount of fine-tuning is required in this scenario, which is an expression of the doublet-triplet splitting problem. We show that this problem is more general, since a model with coupled scalar sectors will in general never realise a hierarchy in vevs. To avoid these problems we advocate imposing the desired hierarchy in vevs as part of the theory. We argue for this viewpoint because the $SU(5)$ breaking and electroweak symmetry breaking need to be adjusted to each other anyway and cannot be regarded as independent mechanisms. We suggest that not only the symmetry breaking pattern needs to be imposed, but also the scales at which the breakings happen. We show quantitatively that the generic theory with hierarchy imposed does not require any fine-tuning of the free parameters which can all be natural and perturbative as desired.
|
2211.10512
|
Pedro Bicudo
|
Pedro Bicudo and Jos\'e Em\'ilio Ribeiro
|
QCD vacuum replicas are metastable
|
8 pages, 8 figures, contribution to the XVth Quark Confinement and
the Hadron Spectrum Conference, Aug 2022 University of Stavanger
| null |
10.1051/epjconf/202227403009
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We study the meson spectra in the excited QCD vacua, denominated replicas. We
find all mesons have real masses, with no tachyons, thus showing the QCD
replicas are indeed metastable.
|
[
{
"created": "Fri, 18 Nov 2022 21:31:43 GMT",
"version": "v1"
}
] |
2023-01-11
|
[
[
"Bicudo",
"Pedro",
""
],
[
"Ribeiro",
"José Emílio",
""
]
] |
We study the meson spectra in the excited QCD vacua, denominated replicas. We find all mesons have real masses, with no tachyons, thus showing the QCD replicas are indeed metastable.
|
hep-ph/9701321
|
Rod Crewther
|
R. J. Crewther (Universities of Berne and Adelaide)
|
Relating inclusive e+e- annihilation to electroproduction sum rules in
Quantum Chromodynamics
|
10 pages, LaTeX 2e with packages cite, multicol, and curves, 2
figures in LaTeX
|
Phys.Lett. B397 (1997) 137-142
|
10.1016/S0370-2693(97)00157-3
|
BUTP-97/01, ADP-97-1/T242
|
hep-ph hep-th
| null |
The Broadhurst-Kataev conjecture, that the ``discrepancy'' in the connection
with the $\pi^0 \to \gamma\gamma$ anomaly equals the beta function
$\beta(\bar{\alpha})$ times a power series in the effective coupling
$\bar{\alpha}$, is proven to all orders of perturbative quantum chromodynamics.
The use of nested short-distance expansions is justified via Weinberg's
power-counting theorem.
|
[
{
"created": "Fri, 17 Jan 1997 14:58:58 GMT",
"version": "v1"
}
] |
2009-10-30
|
[
[
"Crewther",
"R. J.",
"",
"Universities of Berne and Adelaide"
]
] |
The Broadhurst-Kataev conjecture, that the ``discrepancy'' in the connection with the $\pi^0 \to \gamma\gamma$ anomaly equals the beta function $\beta(\bar{\alpha})$ times a power series in the effective coupling $\bar{\alpha}$, is proven to all orders of perturbative quantum chromodynamics. The use of nested short-distance expansions is justified via Weinberg's power-counting theorem.
|
hep-ph/0109070
|
George Grispos
|
A.P. Contogouris (Athens U. & McGill U.), G. Grispos (Athens U.)
|
Approximate calculation of corrections at NLO and NNLO
|
4 pages, 3 figures, presented at "QCD 2000", Montpellier, France,
5-12 July 2000
|
Nucl.Phys.Proc.Suppl.96:94-97,2001
|
10.1016/S0920-5632(01)01115-X
| null |
hep-ph
| null |
For processes involving structure functions and/or fragmentation functions,
arguments that there is a part that dominates the NLO corrections are briefly
reviewed. The arguments are tested against more recent NLO and in particular
NNLO calculations.
|
[
{
"created": "Sun, 9 Sep 2001 15:40:24 GMT",
"version": "v1"
}
] |
2010-01-18
|
[
[
"Contogouris",
"A. P.",
"",
"Athens U. & McGill U."
],
[
"Grispos",
"G.",
"",
"Athens U."
]
] |
For processes involving structure functions and/or fragmentation functions, arguments that there is a part that dominates the NLO corrections are briefly reviewed. The arguments are tested against more recent NLO and in particular NNLO calculations.
|
2405.08880
|
Manuel Szewc
|
David Marzocca, Manuel Szewc, Michele Tammaro
|
Direct CKM determination from W decays at future lepton colliders
|
15 figures, 3 figures
| null | null | null |
hep-ph hep-ex
|
http://creativecommons.org/licenses/by/4.0/
|
We project the reach of future lepton colliders for measuring CKM elements
from direct observations of $W$ decays. We focus our attention to $|V_{cs}|$
and $|V_{cb}|$ determinations, using FCC-ee as case study. We employ
state-of-the-art jet flavor taggers to obtain the projected sensitivity, and
scan over tagger performances to show their effect. We conclude that future
lepton collider can sizeably improve the sensitivity on $|V_{cs}|$ and
$|V_{cb}|$, albeit the achievable reach will strongly depend on the level of
systematic uncertainties on tagger parameters.
|
[
{
"created": "Tue, 14 May 2024 18:00:55 GMT",
"version": "v1"
}
] |
2024-05-16
|
[
[
"Marzocca",
"David",
""
],
[
"Szewc",
"Manuel",
""
],
[
"Tammaro",
"Michele",
""
]
] |
We project the reach of future lepton colliders for measuring CKM elements from direct observations of $W$ decays. We focus our attention to $|V_{cs}|$ and $|V_{cb}|$ determinations, using FCC-ee as case study. We employ state-of-the-art jet flavor taggers to obtain the projected sensitivity, and scan over tagger performances to show their effect. We conclude that future lepton collider can sizeably improve the sensitivity on $|V_{cs}|$ and $|V_{cb}|$, albeit the achievable reach will strongly depend on the level of systematic uncertainties on tagger parameters.
|
2112.03944
|
Zhongbo Kang
|
Alexander M. Czajka, Zhong-Bo Kang, Henry Ma, Fanyi Zhao
|
Quantum Simulation of Chiral Phase Transitions
|
25 pages, 6 figures, published version
|
JHEP 08, 209 (2022)
|
10.1007/JHEP08(2022)209
| null |
hep-ph hep-ex hep-lat nucl-th quant-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
The Nambu-Jona-Lasinio (NJL) model has been widely studied for investigating
the chiral phase structure of strongly interacting matter. The study of the
thermodynamics of field theories within the framework of Lattice Field Theory
is limited by the sign problem, which prevents Monte Carlo evaluation of the
functional integral at a finite chemical potential. Using the quantum imaginary
time evolution (QITE) algorithm, we construct a quantum simulation for the
$(1+1)$ dimensional NJL model at finite temperature and finite chemical
potential. We observe consistency among digital quantum simulation, exact
diagonalization, and analytical solution, indicating further applications of
quantum computing in simulating QCD thermodynamics.
|
[
{
"created": "Tue, 7 Dec 2021 19:04:20 GMT",
"version": "v1"
},
{
"created": "Mon, 5 Dec 2022 17:40:59 GMT",
"version": "v2"
}
] |
2022-12-06
|
[
[
"Czajka",
"Alexander M.",
""
],
[
"Kang",
"Zhong-Bo",
""
],
[
"Ma",
"Henry",
""
],
[
"Zhao",
"Fanyi",
""
]
] |
The Nambu-Jona-Lasinio (NJL) model has been widely studied for investigating the chiral phase structure of strongly interacting matter. The study of the thermodynamics of field theories within the framework of Lattice Field Theory is limited by the sign problem, which prevents Monte Carlo evaluation of the functional integral at a finite chemical potential. Using the quantum imaginary time evolution (QITE) algorithm, we construct a quantum simulation for the $(1+1)$ dimensional NJL model at finite temperature and finite chemical potential. We observe consistency among digital quantum simulation, exact diagonalization, and analytical solution, indicating further applications of quantum computing in simulating QCD thermodynamics.
|
hep-ph/0612229
|
Christopher McMullen
|
C.D. McMullen and S. Nandi
|
Collider Implications of a Non-Universal Higgs
|
16 pages, 5 figures, submitted as a PDF file (thus PostScript may be
unavailable), updated references
|
Phys.Rev.D75:095001,2007
|
10.1103/PhysRevD.75.095001
|
OSU-HEP-06-12
|
hep-ph
| null |
We consider in detail the possibility that the Higgs is wholly or partially
excluded from propagating into one otherwise universal extra dimension. This
exclusion of the Higgs from propagating into an otherwise universal extra
dimension violates tree-level Kaluza-Klein number conservation in the Yukawa
interactions. As a consequence, there is inter-mode mixing between fermions.
For example, zero-mode fermions mix with their associated Kaluza-Klein
excitations. This is in contrast to the original universal extra dimensions
scenario, in which conservation of Kaluza-Klein number prohibits such
inter-mode mixing. Inter-mode mixing is especially significant for the top
quark, since its mass (171.4 +/- 2.1 GeV) is approximately one-half the current
Tevatron mass bound (~350-400 GeV) for Kaluza-Klein excitations of quarks
propagating into universal extra dimensions. We compute the effects that mixing
among the zero-modes and lowest-lying Kaluza-Klein excitations has on the
lightest third-generation charge 2/3 quark mass eigenvalue in the non-universal
Higgs model with one otherwise universal extra dimension. Another consequence
of the inter-mode mixing is that the Kaluza-Klein excitations of the fermions
can decay to a zero-mode Higgs and a corresponding zero-mode fermion. As a
result, the pair production of Kaluza-Klein excitations of the top quark would
lead to two zero-mode Higgs bosons plus a zero-mode top quark/anti-quark pair.
We compute the cross section that the non-universal Higgs model contributes to
Higgs production at the Large Hadron Collider. The effect is quite large: For
example, the Kaluza-Klein contribution to Higgs production is comparable to or
larger than the Standard Model contribution, depending on the Higgs mass, for
compactification scales up to about 600 GeV.
|
[
{
"created": "Tue, 19 Dec 2006 17:56:51 GMT",
"version": "v1"
},
{
"created": "Tue, 20 Feb 2007 18:50:15 GMT",
"version": "v2"
}
] |
2008-11-26
|
[
[
"McMullen",
"C. D.",
""
],
[
"Nandi",
"S.",
""
]
] |
We consider in detail the possibility that the Higgs is wholly or partially excluded from propagating into one otherwise universal extra dimension. This exclusion of the Higgs from propagating into an otherwise universal extra dimension violates tree-level Kaluza-Klein number conservation in the Yukawa interactions. As a consequence, there is inter-mode mixing between fermions. For example, zero-mode fermions mix with their associated Kaluza-Klein excitations. This is in contrast to the original universal extra dimensions scenario, in which conservation of Kaluza-Klein number prohibits such inter-mode mixing. Inter-mode mixing is especially significant for the top quark, since its mass (171.4 +/- 2.1 GeV) is approximately one-half the current Tevatron mass bound (~350-400 GeV) for Kaluza-Klein excitations of quarks propagating into universal extra dimensions. We compute the effects that mixing among the zero-modes and lowest-lying Kaluza-Klein excitations has on the lightest third-generation charge 2/3 quark mass eigenvalue in the non-universal Higgs model with one otherwise universal extra dimension. Another consequence of the inter-mode mixing is that the Kaluza-Klein excitations of the fermions can decay to a zero-mode Higgs and a corresponding zero-mode fermion. As a result, the pair production of Kaluza-Klein excitations of the top quark would lead to two zero-mode Higgs bosons plus a zero-mode top quark/anti-quark pair. We compute the cross section that the non-universal Higgs model contributes to Higgs production at the Large Hadron Collider. The effect is quite large: For example, the Kaluza-Klein contribution to Higgs production is comparable to or larger than the Standard Model contribution, depending on the Higgs mass, for compactification scales up to about 600 GeV.
|
1001.5401
|
Thomas Teubner
|
T. Teubner, K. Hagiwara, R. Liao, A. D. Martin, Daisuke Nomura
|
Update of g-2 of the muon and Delta alpha
|
6 pages, 10 figures, proceedings of the PhiPsi09 conference, 13-16
Oct. 2009, Beijing, China
| null |
10.1088/1674-1137/34/6/019
|
LTH 864
|
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We update our Standard Model predictions for g-2 of the muon and for the
hadronic contributions to the running of the QED coupling, Delta
alpha^5_had(M_Z^2). Particular emphasis is put on recent changes in the
hadronic contributions from new data in the 2pi channel and from the energy
region just below 2 GeV.
|
[
{
"created": "Fri, 29 Jan 2010 13:22:34 GMT",
"version": "v1"
}
] |
2015-05-18
|
[
[
"Teubner",
"T.",
""
],
[
"Hagiwara",
"K.",
""
],
[
"Liao",
"R.",
""
],
[
"Martin",
"A. D.",
""
],
[
"Nomura",
"Daisuke",
""
]
] |
We update our Standard Model predictions for g-2 of the muon and for the hadronic contributions to the running of the QED coupling, Delta alpha^5_had(M_Z^2). Particular emphasis is put on recent changes in the hadronic contributions from new data in the 2pi channel and from the energy region just below 2 GeV.
|
hep-ph/0701261
|
Jens Erler
|
Jens Erler
|
SM Precision Constraints at the LHC/ILC
|
9 pages, 2 figures, talk presented at the VI Latin American Symposium
on High Energy Physics (SILAFAE 2006), Hotel Krystal, Puerto Vallarta,
Mexico, Nov. 1-8, 2006
|
AIPConf.Proc.917:244-251,2007
|
10.1063/1.2751963
| null |
hep-ph hep-ex
| null |
The prospects for electroweak precision physics at the LHC and the ILC are
reviewed. This includes projections for measurements of the effective Z pole
weak mixing angle, sin^2 theta_W (eff.), as well as top quark, W boson, and
Higgs scalar properties. The upcoming years may also see very precise
determinations of sin^2 theta_W (eff.) from lower energies.
|
[
{
"created": "Tue, 30 Jan 2007 21:24:48 GMT",
"version": "v1"
}
] |
2008-11-26
|
[
[
"Erler",
"Jens",
""
]
] |
The prospects for electroweak precision physics at the LHC and the ILC are reviewed. This includes projections for measurements of the effective Z pole weak mixing angle, sin^2 theta_W (eff.), as well as top quark, W boson, and Higgs scalar properties. The upcoming years may also see very precise determinations of sin^2 theta_W (eff.) from lower energies.
|
1702.08853
|
Fernand Renard M
|
Fernand M. Renard
|
CSM constraints on the $gg\to ZH$ process
|
22 pages, 13 figures; references added
| null | null | null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We study more deeply the sensitivity of the $ZH$ production process in
gluon-gluon collisions to the details of a possible Higgs and top quark
compositeness. We establish a relation between Higgs and top quark form factors
which would keep the basic cancellation appearing in SM and satisfy the concept
of CSM. We give illustrations showing the spectacular consequences of various
choices preserving or violating this CSM constraint.
|
[
{
"created": "Tue, 28 Feb 2017 16:36:47 GMT",
"version": "v1"
},
{
"created": "Tue, 7 Mar 2017 15:35:00 GMT",
"version": "v2"
},
{
"created": "Mon, 13 Mar 2017 12:19:20 GMT",
"version": "v3"
}
] |
2017-03-14
|
[
[
"Renard",
"Fernand M.",
""
]
] |
We study more deeply the sensitivity of the $ZH$ production process in gluon-gluon collisions to the details of a possible Higgs and top quark compositeness. We establish a relation between Higgs and top quark form factors which would keep the basic cancellation appearing in SM and satisfy the concept of CSM. We give illustrations showing the spectacular consequences of various choices preserving or violating this CSM constraint.
|
hep-ph/0110233
|
Svjetlana Fajfer
|
S. Fajfer, P. Singer
|
Constraints on heavy Z' couplings from \Delta S = 2 B^- -> K^- K^- \pi^+
decay
|
6 pages
|
Phys.Rev. D65 (2002) 017301
|
10.1103/PhysRevD.65.017301
| null |
hep-ph
| null |
The heavy Z' boson with family nonuniversal couplings can introduce flavour
changing effects. Constraints on nondiagonal Z' couplings coming from the \mu-e
conversion in a muonic atom, K^0 - \bar{K^0} and B - \bar{B} mixing, epsilon
and epsilon'/ \epsilon CP- violating coefficients have been already
established. By using the OPAL upper bound of the branching ratio for the B^-
-> K^- K^- \pi^+ decay, we indicate additional constraints on the Z' couplings.
We comment also on the constraints of Z' couplings coming from the b->d d
\bar{s} transition. The constraint obtained here from the upper bound of the
B^- -> K^- K^- \pi^+ decay involves a different combination of couplings than
those previously presented, but is much weaker.
|
[
{
"created": "Wed, 17 Oct 2001 14:41:10 GMT",
"version": "v1"
}
] |
2009-11-07
|
[
[
"Fajfer",
"S.",
""
],
[
"Singer",
"P.",
""
]
] |
The heavy Z' boson with family nonuniversal couplings can introduce flavour changing effects. Constraints on nondiagonal Z' couplings coming from the \mu-e conversion in a muonic atom, K^0 - \bar{K^0} and B - \bar{B} mixing, epsilon and epsilon'/ \epsilon CP- violating coefficients have been already established. By using the OPAL upper bound of the branching ratio for the B^- -> K^- K^- \pi^+ decay, we indicate additional constraints on the Z' couplings. We comment also on the constraints of Z' couplings coming from the b->d d \bar{s} transition. The constraint obtained here from the upper bound of the B^- -> K^- K^- \pi^+ decay involves a different combination of couplings than those previously presented, but is much weaker.
|
2301.07914
|
Bin Yan
|
Hai Tao Li, Bin Yan and C. -P. Yuan
|
Discriminating between Higgs Production Mechanisms via Jet Charge at the
LHC
|
6 pages, 5 figures, version accepted by PRL
| null |
10.1103/PhysRevLett.131.041802
|
MSUHEP-23-001
|
hep-ph hep-ex
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Discriminating the Higgs production mechanisms plays a crucial role in
directly measuring the couplings of Higgs to gauge bosons for probing the
nature of the electroweak symmetry breaking. We propose a novel method to
distinguish the Higgs production mechanisms at the LHC by utilizing the jet
charge asymmetry of the two leading forward jets in Higgs plus two jets
production. This novel observable provides a way to disentangle the $W$-fusion
from the $Z$-fusion and gluon fusion processes for the first time, due to the
electric charge correlation of the two leading jets in the events. We show that
the Higgs couplings to gauge bosons can be well constrained and its conclusion
does not depend on the other possible new physics effects which modify the
Higgs total or partial width. We also discuss the complementary roles between
the proposed jet charge asymmetry measurement and the Higgs signal strength
measurements at the HL-LHC in determining the Higgs couplings.
|
[
{
"created": "Thu, 19 Jan 2023 06:52:37 GMT",
"version": "v1"
},
{
"created": "Sat, 22 Jul 2023 01:03:58 GMT",
"version": "v2"
}
] |
2023-08-02
|
[
[
"Li",
"Hai Tao",
""
],
[
"Yan",
"Bin",
""
],
[
"Yuan",
"C. -P.",
""
]
] |
Discriminating the Higgs production mechanisms plays a crucial role in directly measuring the couplings of Higgs to gauge bosons for probing the nature of the electroweak symmetry breaking. We propose a novel method to distinguish the Higgs production mechanisms at the LHC by utilizing the jet charge asymmetry of the two leading forward jets in Higgs plus two jets production. This novel observable provides a way to disentangle the $W$-fusion from the $Z$-fusion and gluon fusion processes for the first time, due to the electric charge correlation of the two leading jets in the events. We show that the Higgs couplings to gauge bosons can be well constrained and its conclusion does not depend on the other possible new physics effects which modify the Higgs total or partial width. We also discuss the complementary roles between the proposed jet charge asymmetry measurement and the Higgs signal strength measurements at the HL-LHC in determining the Higgs couplings.
|
hep-ph/9712524
|
Vladimir N. Baier
|
V. N. Baier and V. M. Katkov
|
The Landau-Pomeranchuk-Migdal effect in a thin target
|
LaTeX2.09, 20 pages, 4 eps figures included
| null | null |
BudkerINP 97-105
|
hep-ph
| null |
The Landau, Pomeranchuk, Migdal (LPM) effect (suppression of the
bremsstrahlung from high energy electron due to a multiple scattering of an
emitting electron in dense media) is considered for the case when thickness of
a target is of the order or less than the formation length of radiation. The
effects of the polarization of a medium and transition radiation are taken into
account as well. Qualitative picture of the phenomenon is discussed in detail.
Comparison with recent experimental data is carried out.
|
[
{
"created": "Fri, 26 Dec 1997 08:55:49 GMT",
"version": "v1"
}
] |
2007-05-23
|
[
[
"Baier",
"V. N.",
""
],
[
"Katkov",
"V. M.",
""
]
] |
The Landau, Pomeranchuk, Migdal (LPM) effect (suppression of the bremsstrahlung from high energy electron due to a multiple scattering of an emitting electron in dense media) is considered for the case when thickness of a target is of the order or less than the formation length of radiation. The effects of the polarization of a medium and transition radiation are taken into account as well. Qualitative picture of the phenomenon is discussed in detail. Comparison with recent experimental data is carried out.
|
hep-ph/9505392
|
Sheldon Stone
|
Stephen Playfer and Sheldon Stone (Syracuse University)
|
Rare b Decays
|
To be published in International Journal of Modern Physics Letters A
This is a 34 page review article, the file is uuencoded postscript
|
Int.J.Mod.Phys. A10 (1995) 4107-4138
|
10.1142/S0217751X9500190X
|
HEPSY 95-01
|
hep-ph
| null |
Rare b decays provide a unique opportunity to measure Standard Model
parameters and probe beyond the Standard Model. We review here the
experimentalprogress made in measuring these decays, and the importance of
future measurements, including the possible observation of CP violation.
|
[
{
"created": "Fri, 26 May 1995 20:20:33 GMT",
"version": "v1"
},
{
"created": "Sat, 27 May 1995 14:08:14 GMT",
"version": "v2"
},
{
"created": "Mon, 29 May 1995 00:13:32 GMT",
"version": "v3"
},
{
"created": "Mon, 29 May 1995 17:53:03 GMT",
"version": "v4"
}
] |
2009-10-28
|
[
[
"Playfer",
"Stephen",
"",
"Syracuse University"
],
[
"Stone",
"Sheldon",
"",
"Syracuse University"
]
] |
Rare b decays provide a unique opportunity to measure Standard Model parameters and probe beyond the Standard Model. We review here the experimentalprogress made in measuring these decays, and the importance of future measurements, including the possible observation of CP violation.
|
hep-ph/0310059
|
George Rupp
|
Michael D. Scadron, George Rupp, and Eef van Beveren
|
CP Violation and $\Delta I=1/2$ Enhancement for $K \to \pi\pi$, $K \to
\pi\pi\gamma$ Weak Decays
|
Plain LaTeX, 12 pages, 4 EPS figures. PACS numbers: 11.30.Er,
12.15.Lk, 13.20.Eb, 13.40.Ks. Version 2: 14 pages, improved presentation,
introductory and concluding remarks as well as references added; accepted for
publication in Mod. Phys. Lett. A (2004)
|
Mod.Phys.Lett.A19:2267-2278,2004
|
10.1142/S0217732304015567
| null |
hep-ph
| null |
Data indicate that $\Delta I=1/2$ transitions account for 4.5-4.7% of both CP
conserving and CP violating $K \to 2\pi$ decays, as well as CP conserving
radiative $K \to \pi\pi\gamma$ processes. Observed $K \to \pi\pi\gamma/\pi\pi$
branching ratios are shown to scale near $\alpha/\pi$ or $\alpha/2\pi$. The
$K_L$-$K_S$ mixing angle $\phi$ and the semileptonic weak-rate asymmetry
$\delta$ are reviewed, and theory is shown to be consistent with data. Also, $K
\to 2\pi$ $\Delta I=1/2$ dominance is studied in the context of the chiral
constituent quark model, displaying again excellent agreement with data.
Finally, indirect and direct kaon CP violation are successfully described in
the framework of photon-mediated loop graphs. This suggests that kaon CPV can
be understood via second-order weak transitions, radiatively corrected.
|
[
{
"created": "Sat, 4 Oct 2003 13:44:34 GMT",
"version": "v1"
},
{
"created": "Sat, 14 Aug 2004 16:47:10 GMT",
"version": "v2"
}
] |
2008-11-26
|
[
[
"Scadron",
"Michael D.",
""
],
[
"Rupp",
"George",
""
],
[
"van Beveren",
"Eef",
""
]
] |
Data indicate that $\Delta I=1/2$ transitions account for 4.5-4.7% of both CP conserving and CP violating $K \to 2\pi$ decays, as well as CP conserving radiative $K \to \pi\pi\gamma$ processes. Observed $K \to \pi\pi\gamma/\pi\pi$ branching ratios are shown to scale near $\alpha/\pi$ or $\alpha/2\pi$. The $K_L$-$K_S$ mixing angle $\phi$ and the semileptonic weak-rate asymmetry $\delta$ are reviewed, and theory is shown to be consistent with data. Also, $K \to 2\pi$ $\Delta I=1/2$ dominance is studied in the context of the chiral constituent quark model, displaying again excellent agreement with data. Finally, indirect and direct kaon CP violation are successfully described in the framework of photon-mediated loop graphs. This suggests that kaon CPV can be understood via second-order weak transitions, radiatively corrected.
|
1104.2043
|
Matthew Baumgart
|
Matthew Baumgart and Brock Tweedie
|
Discriminating Top-Antitop Resonances using Azimuthal Decay Correlations
|
24 pages plus appendices, 6 figures. v2: added references, updated
AFB model, expanded discussion of SM interference for spin-0 particle
|
JHEP 1109:049,2011
|
10.1007/JHEP09(2011)049
| null |
hep-ph hep-ex
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Top-antitop pairs produced in the decay of a new heavy resonance will exhibit
spin correlations that contain valuable coupling information. When the tops
decay, these correlations imprint themselves on the angular patterns of the
final quarks and leptons. While many approaches to the measurement of top spin
correlations are known, the most common ones require detailed kinematic
reconstructions and are insensitive to some important spin interference
effects. In particular, spin-1 resonances with mostly-vector or mostly-axial
couplings to top cannot be easily discriminated from one another without
appealing to mass-suppressed effects or to more model-dependent interference
with continuum Standard Model production. Here, we propose to probe the
structure of a resonance's couplings to tops by measuring the azimuthal angles
of the tops' decay products about the production axis. These angles exhibit
modulations which are typically O(0.1-1), and which by themselves allow for
discrimination of spin-0 from higher spins, measurement of the CP-phase for
spin-0, and measurement of the vector/axial composition for spins 1 and 2. For
relativistic tops, the azimuthal decay angles can be well-approximated without
detailed knowledge of the tops' velocities, and appear to be robust against
imperfect energy measurements and neutrino reconstructions. We illustrate this
point in the highly challenging dileptonic decay mode, which also exhibits the
largest modulations. We comment on the relevance of these observables for
testing axigluon-like models that explain the top quark A_FB anomaly at the
Tevatron, through direct production at the LHC.
|
[
{
"created": "Mon, 11 Apr 2011 20:00:11 GMT",
"version": "v1"
},
{
"created": "Sat, 27 Aug 2011 01:18:27 GMT",
"version": "v2"
}
] |
2015-03-19
|
[
[
"Baumgart",
"Matthew",
""
],
[
"Tweedie",
"Brock",
""
]
] |
Top-antitop pairs produced in the decay of a new heavy resonance will exhibit spin correlations that contain valuable coupling information. When the tops decay, these correlations imprint themselves on the angular patterns of the final quarks and leptons. While many approaches to the measurement of top spin correlations are known, the most common ones require detailed kinematic reconstructions and are insensitive to some important spin interference effects. In particular, spin-1 resonances with mostly-vector or mostly-axial couplings to top cannot be easily discriminated from one another without appealing to mass-suppressed effects or to more model-dependent interference with continuum Standard Model production. Here, we propose to probe the structure of a resonance's couplings to tops by measuring the azimuthal angles of the tops' decay products about the production axis. These angles exhibit modulations which are typically O(0.1-1), and which by themselves allow for discrimination of spin-0 from higher spins, measurement of the CP-phase for spin-0, and measurement of the vector/axial composition for spins 1 and 2. For relativistic tops, the azimuthal decay angles can be well-approximated without detailed knowledge of the tops' velocities, and appear to be robust against imperfect energy measurements and neutrino reconstructions. We illustrate this point in the highly challenging dileptonic decay mode, which also exhibits the largest modulations. We comment on the relevance of these observables for testing axigluon-like models that explain the top quark A_FB anomaly at the Tevatron, through direct production at the LHC.
|
1110.3363
|
Luis A. Sanchez
|
Alejandro Jaramillo and Luis A. Sanchez
|
FCNC, CP violation and implications for some rare decays in an SU(4)_L X
U(1)_X extension of the standard model
|
23 pages, 11 figures. Renormalization group QCD effects on flavor
changing observables corrected. References added. Version accepted for
publication in Phys. Rev. D
| null |
10.1103/PhysRevD.84.115001
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Extensions of the standard model (SM) with gauge symmetry SU(3)_c X SU(4)_L X
U(1)_X (3-4-1 extensions) where anomaly cancellation takes place between the
fermion families (three-family models) predict the existence of two new heavy
neutral gauge bosons which transmit flavor changing neutral currents (FCNC) at
tree-level. In this work, in the context of a three-family 3-4-1 extension
which does not contain particles with exotic electric charges, we study the
constraints coming from neutral meson mixing on the parameters of the extension
associated to tree level FCNC effects. Taking into account experimental
measurements of observables related to K and B meson mixing and including new
CP-violating phases, we study the resulting bounds for angles and phases in the
mixing matrix for the down-quark sector, as well as the implications of these
bounds for the modifications in the amplitudes of the clean rare decays K^+ ->
\pi^+ \bar\nu \nu, K_{L} -> \pi^0 \nu \bar\nu, K_L -> \pi^0 l^+ l^- (l=e,\mu)
and B_{d/s} -> \mu^+ \mu^-.
|
[
{
"created": "Fri, 14 Oct 2011 23:52:34 GMT",
"version": "v1"
},
{
"created": "Fri, 11 Nov 2011 19:30:55 GMT",
"version": "v2"
}
] |
2015-05-30
|
[
[
"Jaramillo",
"Alejandro",
""
],
[
"Sanchez",
"Luis A.",
""
]
] |
Extensions of the standard model (SM) with gauge symmetry SU(3)_c X SU(4)_L X U(1)_X (3-4-1 extensions) where anomaly cancellation takes place between the fermion families (three-family models) predict the existence of two new heavy neutral gauge bosons which transmit flavor changing neutral currents (FCNC) at tree-level. In this work, in the context of a three-family 3-4-1 extension which does not contain particles with exotic electric charges, we study the constraints coming from neutral meson mixing on the parameters of the extension associated to tree level FCNC effects. Taking into account experimental measurements of observables related to K and B meson mixing and including new CP-violating phases, we study the resulting bounds for angles and phases in the mixing matrix for the down-quark sector, as well as the implications of these bounds for the modifications in the amplitudes of the clean rare decays K^+ -> \pi^+ \bar\nu \nu, K_{L} -> \pi^0 \nu \bar\nu, K_L -> \pi^0 l^+ l^- (l=e,\mu) and B_{d/s} -> \mu^+ \mu^-.
|
0808.1153
|
Kenji Morita
|
Young-Ho Song, Su Houng Lee, Kenji Morita
|
In-medium modification of P-wave charmonia from QCD sum rules
|
7 pages, 6 figures, to be published in Phys.Rev.C
|
Phys.Rev.C79:014907,2009
|
10.1103/PhysRevC.79.014907
| null |
hep-ph nucl-ex nucl-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We investigate the changes of the masses and widths of $\chi_{c0}$ and
$\chi_{c1}$ in hot gluonic matter near $T_c$ and in nuclear medium using QCD
sum rules. As in the previous works for the $J/\psi$ and $\eta_c$, in-medium
effects are incorporated through the changes of gluon condensates. Twist-2
terms for the $^3 P_0 (\chi_{c0})$ and $^3 P_1 (\chi_{c1})$ are also included
for the first time. The results show that larger mass shifts and width
broadenings take place as compared to the $S$-wave states. As the critical
change take place near $T_c$, related measurements can reveal critical
phenomenon in QCD.
|
[
{
"created": "Fri, 8 Aug 2008 05:39:05 GMT",
"version": "v1"
},
{
"created": "Sat, 10 Jan 2009 07:52:42 GMT",
"version": "v2"
}
] |
2009-04-28
|
[
[
"Song",
"Young-Ho",
""
],
[
"Lee",
"Su Houng",
""
],
[
"Morita",
"Kenji",
""
]
] |
We investigate the changes of the masses and widths of $\chi_{c0}$ and $\chi_{c1}$ in hot gluonic matter near $T_c$ and in nuclear medium using QCD sum rules. As in the previous works for the $J/\psi$ and $\eta_c$, in-medium effects are incorporated through the changes of gluon condensates. Twist-2 terms for the $^3 P_0 (\chi_{c0})$ and $^3 P_1 (\chi_{c1})$ are also included for the first time. The results show that larger mass shifts and width broadenings take place as compared to the $S$-wave states. As the critical change take place near $T_c$, related measurements can reveal critical phenomenon in QCD.
|
2311.15981
|
Oleksandr Sobol Dr.
|
Anastasia V. Lysenko and Oleksandr O. Sobol
|
Quantum kinetic approach to the Schwinger production of scalar particles
in an expanding universe
|
22 pages
|
General Relativity and Gravitation (2024) 56:39
|
10.1007/s10714-024-03226-8
|
MS-TP-23-50
|
hep-ph astro-ph.CO
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We study the Schwinger pair creation of scalar charged particles by a
homogeneous electric field in an expanding universe in the quantum kinetic
approach. We introduce an adiabatic vacuum for the scalar field based on the
Wentzel-Kramers-Brillouin solution to the mode equation in conformal time and
apply the formalism of Bogolyubov coefficients to derive a system of quantum
Vlasov equations for three real kinetic functions. Compared to the analogous
system of equations previously reported in the literature, the new one has two
advantages. First, its solutions exhibit a faster decrease at large momenta
which makes it more suitable for numerical computations. Second, it predicts no
particle creation in the case of conformally coupled massless scalar field in
the vanishing electric field, i.e., it respects the conformal symmetry of the
system. We identify the ultraviolet divergences in the electric current and
energy-momentum tensor of produced particles and introduce the corresponding
counterterms in order to cancel them.
|
[
{
"created": "Mon, 27 Nov 2023 16:27:50 GMT",
"version": "v1"
},
{
"created": "Mon, 11 Dec 2023 14:01:28 GMT",
"version": "v2"
},
{
"created": "Tue, 2 Apr 2024 12:34:19 GMT",
"version": "v3"
}
] |
2024-04-03
|
[
[
"Lysenko",
"Anastasia V.",
""
],
[
"Sobol",
"Oleksandr O.",
""
]
] |
We study the Schwinger pair creation of scalar charged particles by a homogeneous electric field in an expanding universe in the quantum kinetic approach. We introduce an adiabatic vacuum for the scalar field based on the Wentzel-Kramers-Brillouin solution to the mode equation in conformal time and apply the formalism of Bogolyubov coefficients to derive a system of quantum Vlasov equations for three real kinetic functions. Compared to the analogous system of equations previously reported in the literature, the new one has two advantages. First, its solutions exhibit a faster decrease at large momenta which makes it more suitable for numerical computations. Second, it predicts no particle creation in the case of conformally coupled massless scalar field in the vanishing electric field, i.e., it respects the conformal symmetry of the system. We identify the ultraviolet divergences in the electric current and energy-momentum tensor of produced particles and introduce the corresponding counterterms in order to cancel them.
|
hep-ph/9512238
| null |
X. Artru
|
Some aspects of transversity
|
4 pages, latex, no figures
| null | null | null |
hep-ph
| null |
The specificities of transverse polarization with respect to helicity of
ultrarelativistic fermions are pointed out. For massless fermions, a covariant
transversity four-vector is defined, up to a kind of gauge transformation. The
tranversity distribution of quarks in a nucleon is defined. Its possible
connection to the magnetic or electric dipole moment of the baryon is
conjectured. Consequences of the approximate chiral invariance on transverse
spin asymmetries in hard processes are enumerated. The "sheared jet effect"
introduced by Collins for measuring the transverse polarization of a final
quark is presented.
|
[
{
"created": "Tue, 5 Dec 1995 14:29:25 GMT",
"version": "v1"
}
] |
2007-05-23
|
[
[
"Artru",
"X.",
""
]
] |
The specificities of transverse polarization with respect to helicity of ultrarelativistic fermions are pointed out. For massless fermions, a covariant transversity four-vector is defined, up to a kind of gauge transformation. The tranversity distribution of quarks in a nucleon is defined. Its possible connection to the magnetic or electric dipole moment of the baryon is conjectured. Consequences of the approximate chiral invariance on transverse spin asymmetries in hard processes are enumerated. The "sheared jet effect" introduced by Collins for measuring the transverse polarization of a final quark is presented.
|
2212.04954
|
Luca Rottoli
|
Luca Buonocore, Simone Devoto, Stefan Kallweit, Javier Mazzitelli,
Luca Rottoli, Chiara Savoini
|
Associated production of a $W$ boson and massive bottom quarks at
next-to-next-to-leading order in QCD
|
8 pages, 2 figures, 2 tables. Final version published in PRD
| null |
10.1103/PhysRevD.107.074032
|
ZU-TH 60/22, TIF-UNIMI-2022-22, PSI-PR-22-35
|
hep-ph hep-ex
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We present the first calculation for the hadroproduction of a $W$ boson in
association with a massive bottom ($b$) quark-antiquark pair at
next-to-next-to-leading order (NNLO) in QCD perturbation theory. We exploit the
hierarchy between the $b$ quark mass and the characteristic energy scale of the
process to obtain a reliable analytic expression for the two-loop virtual
amplitude with three massive legs, starting from the corresponding result
available for massless bottom quarks. The use of massive $b$ quarks avoids the
ambiguities associated with the correct flavour assignment in massless
calculations, paving the way to a more realistic comparison with experimental
data. We present phenomenological results considering proton-proton collisions
at centre-of-mass energy $\sqrt{s}=13.6$ TeV for inclusive $Wb \bar b$
production and within a fiducial region relevant for the associated production
of a $W$ boson and a Higgs boson decaying into a $b \bar b$ pair, for which $Wb
\bar b$ production represents one of the most relevant backgrounds. We find
that the NNLO corrections are substantial and that their inclusion is mandatory
to obtain reliable predictions.
|
[
{
"created": "Fri, 9 Dec 2022 16:04:46 GMT",
"version": "v1"
},
{
"created": "Thu, 11 Apr 2024 11:52:36 GMT",
"version": "v2"
}
] |
2024-04-12
|
[
[
"Buonocore",
"Luca",
""
],
[
"Devoto",
"Simone",
""
],
[
"Kallweit",
"Stefan",
""
],
[
"Mazzitelli",
"Javier",
""
],
[
"Rottoli",
"Luca",
""
],
[
"Savoini",
"Chiara",
""
]
] |
We present the first calculation for the hadroproduction of a $W$ boson in association with a massive bottom ($b$) quark-antiquark pair at next-to-next-to-leading order (NNLO) in QCD perturbation theory. We exploit the hierarchy between the $b$ quark mass and the characteristic energy scale of the process to obtain a reliable analytic expression for the two-loop virtual amplitude with three massive legs, starting from the corresponding result available for massless bottom quarks. The use of massive $b$ quarks avoids the ambiguities associated with the correct flavour assignment in massless calculations, paving the way to a more realistic comparison with experimental data. We present phenomenological results considering proton-proton collisions at centre-of-mass energy $\sqrt{s}=13.6$ TeV for inclusive $Wb \bar b$ production and within a fiducial region relevant for the associated production of a $W$ boson and a Higgs boson decaying into a $b \bar b$ pair, for which $Wb \bar b$ production represents one of the most relevant backgrounds. We find that the NNLO corrections are substantial and that their inclusion is mandatory to obtain reliable predictions.
|
hep-ph/0007340
|
Robert S. Plant
|
Robert S. Plant, Michael C. Birse (University of Manchester)
|
Mesonic fluctuations in a nonlocal Nambu-Jona-Lasinio model
|
22 pages (RevTeX), 12 figures (using graphicx.sty), v3 has improved
numerics
|
Nucl.Phys. A703 (2002) 717-744
|
10.1016/S0375-9474(01)01669-4
|
TH/00/05
|
hep-ph nucl-th
| null |
The effects of meson fluctuations are studied in a nonlocal generalization of
the Nambu-Jona-Lasinio model, by including terms of next-to-leading order (NLO)
in 1/N_c. In the model with only scalar and pseudoscalar interactions NLO
contributions to the quark condensate are found to be very small. This is a
result of cancellation between virtual mesons and Fock terms, which occurs for
the parameter sets of most interest. In the quark self-energy, similar
cancellations arise in the tadpole diagrams, although not in other NLO pieces
which contribute at the \sim 25% level. The effects on pion properties are also
found to be small. NLO contributions from real $\pi\pi$ intermediate states
increase the sigma meson mass by $\sim 30%$. In an extended model with vector
and axial interactions, there are indications that NLO effects could be larger.
|
[
{
"created": "Fri, 28 Jul 2000 15:41:19 GMT",
"version": "v1"
},
{
"created": "Tue, 27 Feb 2001 11:05:22 GMT",
"version": "v2"
},
{
"created": "Tue, 13 Nov 2001 12:18:44 GMT",
"version": "v3"
}
] |
2009-10-31
|
[
[
"Plant",
"Robert S.",
"",
"University of Manchester"
],
[
"Birse",
"Michael C.",
"",
"University of Manchester"
]
] |
The effects of meson fluctuations are studied in a nonlocal generalization of the Nambu-Jona-Lasinio model, by including terms of next-to-leading order (NLO) in 1/N_c. In the model with only scalar and pseudoscalar interactions NLO contributions to the quark condensate are found to be very small. This is a result of cancellation between virtual mesons and Fock terms, which occurs for the parameter sets of most interest. In the quark self-energy, similar cancellations arise in the tadpole diagrams, although not in other NLO pieces which contribute at the \sim 25% level. The effects on pion properties are also found to be small. NLO contributions from real $\pi\pi$ intermediate states increase the sigma meson mass by $\sim 30%$. In an extended model with vector and axial interactions, there are indications that NLO effects could be larger.
|
hep-ph/0503145
|
Carl Shakin
|
Hu Li, C. M. Shakin, Xiangdong Li
|
Relativistic Calculation of the Width of the Theta (1540) Pentaquark
|
11 pages, 5 figures
|
Phys.Rev.C71:068203,2005
|
10.1103/PhysRevC.71.068203
|
BCCNT: 05/314/333
|
hep-ph hep-lat nucl-th
| null |
We calculate the width of the Theta(1540) pentaquark in a relativistic model
in which the pentaquark is considered to be composed of a scalar diquark and a
spin 1/2 triquark. We consider both positive and negative parity for the
pentaquark. There is a single parameter in our model which we vary and which
describes the size of the pentaquark. If the pentaquark size is somewhat
smaller than that of the nucleon, we find quite small widths for the pentaquark
of about 1 MeV or less. Our model of confinement plays an important role in our
analysis and makes it possible to use Feynman diagrams to describe the decay of
the pentaquark.
|
[
{
"created": "Tue, 15 Mar 2005 15:17:12 GMT",
"version": "v1"
}
] |
2011-07-19
|
[
[
"Li",
"Hu",
""
],
[
"Shakin",
"C. M.",
""
],
[
"Li",
"Xiangdong",
""
]
] |
We calculate the width of the Theta(1540) pentaquark in a relativistic model in which the pentaquark is considered to be composed of a scalar diquark and a spin 1/2 triquark. We consider both positive and negative parity for the pentaquark. There is a single parameter in our model which we vary and which describes the size of the pentaquark. If the pentaquark size is somewhat smaller than that of the nucleon, we find quite small widths for the pentaquark of about 1 MeV or less. Our model of confinement plays an important role in our analysis and makes it possible to use Feynman diagrams to describe the decay of the pentaquark.
|
2112.08801
|
Alejandro Segarra
|
Thomas Schwetz and Alejandro Segarra
|
On T violation in non-standard neutrino oscillation scenarios
|
10 pages, 2 figures, 1 table
| null |
10.1103/PhysRevD.105.055001
| null |
hep-ph
|
http://creativecommons.org/licenses/by/4.0/
|
We discuss time reversal (T) violation in neutrino oscillations in generic
new physics scenarios. A general parameterization is adopted to describe
flavour evolution, which captures a wide range of new physics effects,
including non-standard neutrino interactions, non-unitarity, and sterile
neutrinos in a model-independent way. In this framework, we discuss general
properties of time reversal in the context of long-baseline neutrino
experiments. Special attention is given to fundamental versus environmental T
violation in the presence of generic new physics. We point out that T violation
in the disappearance channel requires new physics which modifies flavour mixing
at neutrino production and detection. We use time-dependent perturbation theory
to study the effect of non-constant matter density along the neutrino path, and
quantify the effects for the well studied baselines of the DUNE, T2HK, and
T2HKK projects. The material presented here provides the phenomenological
background for the model-independent test of T violation proposed by us in Ref.
[1].
|
[
{
"created": "Thu, 16 Dec 2021 11:35:16 GMT",
"version": "v1"
}
] |
2022-03-14
|
[
[
"Schwetz",
"Thomas",
""
],
[
"Segarra",
"Alejandro",
""
]
] |
We discuss time reversal (T) violation in neutrino oscillations in generic new physics scenarios. A general parameterization is adopted to describe flavour evolution, which captures a wide range of new physics effects, including non-standard neutrino interactions, non-unitarity, and sterile neutrinos in a model-independent way. In this framework, we discuss general properties of time reversal in the context of long-baseline neutrino experiments. Special attention is given to fundamental versus environmental T violation in the presence of generic new physics. We point out that T violation in the disappearance channel requires new physics which modifies flavour mixing at neutrino production and detection. We use time-dependent perturbation theory to study the effect of non-constant matter density along the neutrino path, and quantify the effects for the well studied baselines of the DUNE, T2HK, and T2HKK projects. The material presented here provides the phenomenological background for the model-independent test of T violation proposed by us in Ref. [1].
|
2404.03692
|
Jo\~ao Paulo Da Silva Melo
|
Jo\~ao Paulo S. Melo and Jos\'e A. Helay\"el-Neto
|
Re-assessing special aspects of Dirac fermions in presence of
Lorentz-symmetry violation
|
14 pages, 2 figures
| null | null | null |
hep-ph hep-th
|
http://creativecommons.org/licenses/by/4.0/
|
This paper focuses on additional inspections concerning the fermionic sector
of the Standard Model Extension (SME). In this context, our main effort in this
contribution is to investigate effects of Lorentz-symmetry violation (LSV) on
the Klein Paradox, the Zitterbewegung and its phenomenology in connection to
Condensed Matter Physics, Atomic Physics, and Astrophysics. Finally, we discuss
a particular realization of LSV in the Dirac equation, considering an asymmetry
between space and time due to a scale factor present in the linear momentum of
the fermion, but which does not touch its time derivative. We go further and
extend the implications of this asymmetry in the situation the scale factor
becomes space-time dependent to compute its influence on the kinematics of the
Compton effect with the extended dispersion relation for the fermion that
scatters the photon.
|
[
{
"created": "Wed, 3 Apr 2024 02:00:35 GMT",
"version": "v1"
}
] |
2024-04-08
|
[
[
"Melo",
"João Paulo S.",
""
],
[
"Helayël-Neto",
"José A.",
""
]
] |
This paper focuses on additional inspections concerning the fermionic sector of the Standard Model Extension (SME). In this context, our main effort in this contribution is to investigate effects of Lorentz-symmetry violation (LSV) on the Klein Paradox, the Zitterbewegung and its phenomenology in connection to Condensed Matter Physics, Atomic Physics, and Astrophysics. Finally, we discuss a particular realization of LSV in the Dirac equation, considering an asymmetry between space and time due to a scale factor present in the linear momentum of the fermion, but which does not touch its time derivative. We go further and extend the implications of this asymmetry in the situation the scale factor becomes space-time dependent to compute its influence on the kinematics of the Compton effect with the extended dispersion relation for the fermion that scatters the photon.
|
hep-ph/0207153
|
Maxim V. Polyakov
|
M.V. Polyakov, A.G. Shuvaev
|
On "dual" parametrizations of generalized parton distributions
|
19 pages
| null | null |
RUB-TP2-12/02
|
hep-ph
| null |
We propose a parametrization for the generalized parton distributions (GPDs)
which is based on representation of parton distributions as an infinite series
of t-channel exchanges. The entire generalized parton distribution is given as
an infinite sum over contributions of generalized light-cone distribution
amplitudes in the t-channel. We also discuss the relations of the lowest Mellin
moments of GPDs to basic mechanical characteristics of the nucleon as a
compound system.
|
[
{
"created": "Fri, 12 Jul 2002 18:16:46 GMT",
"version": "v1"
}
] |
2007-05-23
|
[
[
"Polyakov",
"M. V.",
""
],
[
"Shuvaev",
"A. G.",
""
]
] |
We propose a parametrization for the generalized parton distributions (GPDs) which is based on representation of parton distributions as an infinite series of t-channel exchanges. The entire generalized parton distribution is given as an infinite sum over contributions of generalized light-cone distribution amplitudes in the t-channel. We also discuss the relations of the lowest Mellin moments of GPDs to basic mechanical characteristics of the nucleon as a compound system.
|
0906.2435
|
Jens Erler
|
Jens Erler, Paul Langacker, Shoaib Munir and Eduardo Rojas
|
Improved Constraints on Z' Bosons from Electroweak Precision Data
|
18 pages, 10 figures, final version as it will appear in Journal
(JHEP)
|
JHEP 0908:017,2009
|
10.1088/1126-6708/2009/08/017
| null |
hep-ph hep-ex
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We analyze various models with an extra U(1) gauge symmetry in addition to
the Standard Model (SM) gauge group at low energies, and impose limits on the
mass of the neutral Z' boson, M_Z', predicted in all such models, and on the
Z-Z' mixing angle, theta_ZZ'. The precision electroweak data strongly constrain
theta_ZZ' to very small values and for most models we find lower limits on M_Z'
of order 1 TeV. In one case we obtain a somewhat better fit than in the SM
(although this is only marginally statistically significant) and here we find a
weak upper limit at the 90% C.L.
|
[
{
"created": "Fri, 12 Jun 2009 23:45:24 GMT",
"version": "v1"
},
{
"created": "Fri, 19 Jun 2009 22:18:43 GMT",
"version": "v2"
},
{
"created": "Thu, 2 Jul 2009 18:00:08 GMT",
"version": "v3"
}
] |
2010-01-15
|
[
[
"Erler",
"Jens",
""
],
[
"Langacker",
"Paul",
""
],
[
"Munir",
"Shoaib",
""
],
[
"Rojas",
"Eduardo",
""
]
] |
We analyze various models with an extra U(1) gauge symmetry in addition to the Standard Model (SM) gauge group at low energies, and impose limits on the mass of the neutral Z' boson, M_Z', predicted in all such models, and on the Z-Z' mixing angle, theta_ZZ'. The precision electroweak data strongly constrain theta_ZZ' to very small values and for most models we find lower limits on M_Z' of order 1 TeV. In one case we obtain a somewhat better fit than in the SM (although this is only marginally statistically significant) and here we find a weak upper limit at the 90% C.L.
|
1807.10927
|
Renata Jora
|
Amir H. Fariborz and Renata Jora
|
Generalized linear sigma model with two glueballs
|
24 pages, version accepted for publication in Phys. Rev. D
|
Phys. Rev. D 98, 094032 (2018)
|
10.1103/PhysRevD.98.094032
| null |
hep-ph nucl-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We present a generalized linear sigma model that includes both scalar and
pseudoscalar glueballs in addition to a quark-antiquark as well as a four-quark
chiral nonet. Utilizing the axial and trace anomalies of QCD (at the effective
mesonic level), we aim to develope the most general structure of the Lagrangian
which can be used to study the interaction of quarkonia with glueballs. We then
study the effect of scalar glueball on the vacuum of the model by considering a
decoupling limit in which the glueball fields are decoupled from quarkonia.
This determines the properties of the pure scalar glueball and builds a
practical foundation for determining the model parameters when the interactions
are turned on.
|
[
{
"created": "Sat, 28 Jul 2018 11:42:21 GMT",
"version": "v1"
},
{
"created": "Thu, 25 Oct 2018 13:02:41 GMT",
"version": "v2"
},
{
"created": "Thu, 25 Oct 2018 03:16:45 GMT",
"version": "v3"
}
] |
2018-12-05
|
[
[
"Fariborz",
"Amir H.",
""
],
[
"Jora",
"Renata",
""
]
] |
We present a generalized linear sigma model that includes both scalar and pseudoscalar glueballs in addition to a quark-antiquark as well as a four-quark chiral nonet. Utilizing the axial and trace anomalies of QCD (at the effective mesonic level), we aim to develope the most general structure of the Lagrangian which can be used to study the interaction of quarkonia with glueballs. We then study the effect of scalar glueball on the vacuum of the model by considering a decoupling limit in which the glueball fields are decoupled from quarkonia. This determines the properties of the pure scalar glueball and builds a practical foundation for determining the model parameters when the interactions are turned on.
|
hep-ph/0208109
|
Jonathan R. Ellis
|
John Ellis (CERN)
|
Looking Back at the First Decade of 21st-Century High-Energy Physics
|
18 pages, 16 eps figures, uses ws-procs9x6.cls (included)
| null |
10.1142/9789812704917_0014
|
CERN-TH/2002-189
|
hep-ph
| null |
On the occasion of the Tenth Conference on String Phenomenology in 2011, I
review the dramatic progress since 2002 in experimental tests of fundamental
theoretical ideas. These include the discovery of (probably fermionic) extra
dimensions at the LHC, the discovery of dark matter particles, observations of
charged-lepton flavour violation, the debut of quantum gravity phenomenology
and the emergence of space-time from the string soup.
|
[
{
"created": "Mon, 12 Aug 2002 07:45:17 GMT",
"version": "v1"
}
] |
2017-08-23
|
[
[
"Ellis",
"John",
"",
"CERN"
]
] |
On the occasion of the Tenth Conference on String Phenomenology in 2011, I review the dramatic progress since 2002 in experimental tests of fundamental theoretical ideas. These include the discovery of (probably fermionic) extra dimensions at the LHC, the discovery of dark matter particles, observations of charged-lepton flavour violation, the debut of quantum gravity phenomenology and the emergence of space-time from the string soup.
|
2404.05492
|
German Rodrigo
|
The LTD Collaboration, Selomit Ram\'irez-Uribe, Andr\'es E.
Renter\'ia-Olivo, David F. Renter\'ia-Estrada, Jorge J. Mart\'inez de
Lejarza, Prasanna K. Dhani, Leandro Cieri, Roger J. Hern\'andez-Pinto, German
F. R. Sborlini, William J. Torres Bobadilla and Germ\'an Rodrigo
|
Vacuum amplitudes and time-like causal unitary in the loop-tree duality
|
11 pages, 6 figures
| null | null | null |
hep-ph hep-ex hep-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We present the first proof-of-concept application to decay processes at
higher perturbative orders of LTD causal unitary, a novel methodology that
exploits the causal properties of vacuum amplitudes in the loop-tree duality
(LTD) and is directly well-defined in the four physical dimensions of the
space-time. The generation of loop- and tree-level contributions to the
differential decay rates from a kernel multiloop vacuum amplitude is shown in
detail, and explicit expressions are presented for selected processes that are
suitable for a lightweight understanding of the method. Specifically, we
provide a clear physical interpretation of the local cancellation of soft,
collinear and unitary threshold singularities, and of the local renormalisation
of ultraviolet singularities. The presentation is illustrated with numerical
results that showcase the advantages of the method.
|
[
{
"created": "Mon, 8 Apr 2024 13:12:38 GMT",
"version": "v1"
}
] |
2024-04-09
|
[
[
"The LTD Collaboration",
"",
""
],
[
"Ramírez-Uribe",
"Selomit",
""
],
[
"Rentería-Olivo",
"Andrés E.",
""
],
[
"Rentería-Estrada",
"David F.",
""
],
[
"de Lejarza",
"Jorge J. Martínez",
""
],
[
"Dhani",
"Prasanna K.",
""
],
[
"Cieri",
"Leandro",
""
],
[
"Hernández-Pinto",
"Roger J.",
""
],
[
"Sborlini",
"German F. R.",
""
],
[
"Bobadilla",
"William J. Torres",
""
],
[
"Rodrigo",
"Germán",
""
]
] |
We present the first proof-of-concept application to decay processes at higher perturbative orders of LTD causal unitary, a novel methodology that exploits the causal properties of vacuum amplitudes in the loop-tree duality (LTD) and is directly well-defined in the four physical dimensions of the space-time. The generation of loop- and tree-level contributions to the differential decay rates from a kernel multiloop vacuum amplitude is shown in detail, and explicit expressions are presented for selected processes that are suitable for a lightweight understanding of the method. Specifically, we provide a clear physical interpretation of the local cancellation of soft, collinear and unitary threshold singularities, and of the local renormalisation of ultraviolet singularities. The presentation is illustrated with numerical results that showcase the advantages of the method.
|
1601.04291
|
Anish Ghoshal
|
Anish Ghoshal
|
On Electroweak Phase Transition and Di-photon Excess with a 750 GeV
Scalar Resonance
| null | null | null | null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
For successful electroweak baryogenesis to take place through the sphaleron
process the universe needs to undergo a strong first order cosmological phase
transition. While it does not occur in the Standard Model it becomes possible
in the presence of extra scalars in BSM. One of these scalars can well be
responsible for the recently observed diphoton excess in the CMS and ATLAS
experiments in LHC. We study the Electroweak phase transition in a myriad of
scalar models in this context.
|
[
{
"created": "Sun, 17 Jan 2016 13:17:42 GMT",
"version": "v1"
}
] |
2016-01-19
|
[
[
"Ghoshal",
"Anish",
""
]
] |
For successful electroweak baryogenesis to take place through the sphaleron process the universe needs to undergo a strong first order cosmological phase transition. While it does not occur in the Standard Model it becomes possible in the presence of extra scalars in BSM. One of these scalars can well be responsible for the recently observed diphoton excess in the CMS and ATLAS experiments in LHC. We study the Electroweak phase transition in a myriad of scalar models in this context.
|
2206.14790
|
Johann Usovitsch
|
Martijn Hidding, Johann Usovitsch
|
Feynman parameter integration through differential equations
| null | null | null |
UUITP-31/22,CERN-TH-2022-111
|
hep-ph hep-th
|
http://creativecommons.org/licenses/by/4.0/
|
We present a new method for numerically computing generic multi-loop Feynman
integrals. The method relies on an iterative application of Feynman's trick for
combining two propagators. Each application of Feynman's trick introduces a
simplified Feynman integral topology which depends on a Feynman parameter that
should be integrated over. For each integral family, we set up a system of
differential equations which we solve in terms of a piecewise collection of
generalized series expansions in the Feynman parameter. These generalized
series expansions can be efficiently integrated term by term, and segment by
segment. This approach leads to a fully algorithmic method for computing
Feynman integrals from differential equations, which does not require the
manual determination of boundary conditions. Furthermore, the most complicated
topology that appears in the method often has less master integrals than the
original one. We illustrate the strength of our method with a five-point
two-loop integral family.
|
[
{
"created": "Wed, 29 Jun 2022 17:45:57 GMT",
"version": "v1"
}
] |
2022-06-30
|
[
[
"Hidding",
"Martijn",
""
],
[
"Usovitsch",
"Johann",
""
]
] |
We present a new method for numerically computing generic multi-loop Feynman integrals. The method relies on an iterative application of Feynman's trick for combining two propagators. Each application of Feynman's trick introduces a simplified Feynman integral topology which depends on a Feynman parameter that should be integrated over. For each integral family, we set up a system of differential equations which we solve in terms of a piecewise collection of generalized series expansions in the Feynman parameter. These generalized series expansions can be efficiently integrated term by term, and segment by segment. This approach leads to a fully algorithmic method for computing Feynman integrals from differential equations, which does not require the manual determination of boundary conditions. Furthermore, the most complicated topology that appears in the method often has less master integrals than the original one. We illustrate the strength of our method with a five-point two-loop integral family.
|
1911.06536
|
Ju-Jun Xie
|
He Zhou and Ju-Jun Xie
|
Role of the $\Lambda(1600)$ in the $K^-p \to \Lambda \pi^0\pi^0$
reaction
|
7 pages, 4 figures. Published version
|
Commun. Theor. Phys. 72 (2020) 045202
|
10.1088/1572-9494/ab6913
| null |
hep-ph hep-ex nucl-ex nucl-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Role of the $\Lambda(1600)$ is studied in the $K^- p \to \Lambda \pi^0 \pi^0$
reaction by using the effective Lagrangian approach near the threshold. We
perform a calculation for the total and differential cross sections by
considering the contributions from the $\Lambda(1600)$ and $\Lambda(1670)$
intermediate resonances decaying into $\pi^0 \Sigma^{*0}(1385)$ with
$\Sigma^{*0}(1385)$ decaying into $\pi^0 \Lambda$. Besides, the non-resonance
process from $u$-channel nucleon pole is also taken into account. With our
model parameters, the current experimental data on the total cross sections of
the $K^- p \to \Lambda \pi^0 \pi^0$ reaction can be well reproduced. It is
shown that we really need the contribution from the $\Lambda(1600)$ with
spin-parity $J^P = 1/2^+$, and that these measurements can be used to determine
some of the properties of the $\Lambda(1600)$ resonance. Furthermore, we also
plot the $\pi^0 \Lambda$ invariant mass distributions which could be tested by
the future experimental measurements.
|
[
{
"created": "Fri, 15 Nov 2019 09:43:22 GMT",
"version": "v1"
},
{
"created": "Wed, 8 Apr 2020 08:20:58 GMT",
"version": "v2"
}
] |
2020-04-09
|
[
[
"Zhou",
"He",
""
],
[
"Xie",
"Ju-Jun",
""
]
] |
Role of the $\Lambda(1600)$ is studied in the $K^- p \to \Lambda \pi^0 \pi^0$ reaction by using the effective Lagrangian approach near the threshold. We perform a calculation for the total and differential cross sections by considering the contributions from the $\Lambda(1600)$ and $\Lambda(1670)$ intermediate resonances decaying into $\pi^0 \Sigma^{*0}(1385)$ with $\Sigma^{*0}(1385)$ decaying into $\pi^0 \Lambda$. Besides, the non-resonance process from $u$-channel nucleon pole is also taken into account. With our model parameters, the current experimental data on the total cross sections of the $K^- p \to \Lambda \pi^0 \pi^0$ reaction can be well reproduced. It is shown that we really need the contribution from the $\Lambda(1600)$ with spin-parity $J^P = 1/2^+$, and that these measurements can be used to determine some of the properties of the $\Lambda(1600)$ resonance. Furthermore, we also plot the $\pi^0 \Lambda$ invariant mass distributions which could be tested by the future experimental measurements.
|
hep-ph/0203235
|
Jen-Chieh Peng
|
Jen-Chieh Peng
|
Status of Spin Physics - Experimental Summary
|
18 pages, 7 figures, Invited talk presented at the Third
Circum-Pan-Pacific Symposium on High Energy Spin Physics held in Beijing,
October, 2001
|
Int.J.Mod.Phys. A18 (2003) 1513-1530
|
10.1142/S0217751X03015015
| null |
hep-ph
| null |
The current status of spin physics experiments, based on talks presented at
the Third Circum-Pan-Pacific Symposium on High Energy Spin Physics held in
Beijing, 2001, is summarized in this article. Highlights of recent experimental
results at SLAC, JLab, and DESY, as well as future plans at these facilities
and at RHIC-spin are discussed.
|
[
{
"created": "Mon, 25 Mar 2002 17:12:52 GMT",
"version": "v1"
}
] |
2009-11-07
|
[
[
"Peng",
"Jen-Chieh",
""
]
] |
The current status of spin physics experiments, based on talks presented at the Third Circum-Pan-Pacific Symposium on High Energy Spin Physics held in Beijing, 2001, is summarized in this article. Highlights of recent experimental results at SLAC, JLab, and DESY, as well as future plans at these facilities and at RHIC-spin are discussed.
|
hep-ph/0002230
|
Christopher T. Hill
|
Christopher T. Hill
|
The Diffractive Quantum Limits of Particle Colliders
| null | null | null |
Fermilab-Pub-00/047-T; EFI-2000-6
|
hep-ph hep-ex physics.acc-ph
| null |
Quantum Mechanics places limits on achievable transverse beam spot sizes of
particle accelerators. We estimate this limit for a linear collider to be
\Delta x > \hbar c f/E\delta_0 where f is the final focal length, E the beam
energy, and \delta_0 the intrinsic transverse Gaussian width of the electron
wave-function. \delta_0 is determined in the phase space damping rings, and we
find \delta_0 \approx \sqrt{\hbar c /eB} where B is the typical wiggler
magnetic field strength in this system. For the NLC \delta_0 = 25 nm, and
\Delta x = 0.06 nm, about two orders of magnitude smaller than the design goal.
We can recover a crude estimate of the classical result when we include
radiative relaxation effects. We also consider a synchrotron and obtain \Delta
x > \sqrt{\hbar c f/E} = O(1.0) nm. We discuss formulation of quantum beam
optics relevant to these issues.
|
[
{
"created": "Tue, 22 Feb 2000 19:53:30 GMT",
"version": "v1"
},
{
"created": "Wed, 23 Feb 2000 16:10:20 GMT",
"version": "v2"
}
] |
2007-05-23
|
[
[
"Hill",
"Christopher T.",
""
]
] |
Quantum Mechanics places limits on achievable transverse beam spot sizes of particle accelerators. We estimate this limit for a linear collider to be \Delta x > \hbar c f/E\delta_0 where f is the final focal length, E the beam energy, and \delta_0 the intrinsic transverse Gaussian width of the electron wave-function. \delta_0 is determined in the phase space damping rings, and we find \delta_0 \approx \sqrt{\hbar c /eB} where B is the typical wiggler magnetic field strength in this system. For the NLC \delta_0 = 25 nm, and \Delta x = 0.06 nm, about two orders of magnitude smaller than the design goal. We can recover a crude estimate of the classical result when we include radiative relaxation effects. We also consider a synchrotron and obtain \Delta x > \sqrt{\hbar c f/E} = O(1.0) nm. We discuss formulation of quantum beam optics relevant to these issues.
|
hep-ph/9601376
|
Alejandra Melfo
|
Gia Dvali, Alejandra Melfo and Goran Senjanovic
|
Nonrestoration of spontaneously broken P, CP and PQ at high temperature
|
22 pages, 3 figures, uses psfig. Replaced version with the Latex
source
|
Phys.Rev. D54 (1996) 7857-7866
|
10.1103/PhysRevD.54.7857
|
SISSA Ref. 18/96/A
|
hep-ph astro-ph
| null |
The possibility of P and CP violation at high temperature in models where
these symmetries are spontaneously broken is investigated. It is found that in
minimal models that include singlet fields, high T nonrestoration is possible
for a wide range of parameters of the theory, in particular in models of CP
violation with a CP-odd Higgs field. The same holds true for the invisible
axion version of the Peccei-Quinn mechanism. This can provide both a way out
for the domain wall problem in these theories and the CP violation required for
baryogenesis. In the case of spontaneous P violation it turns out that high T
nonrestoration requires going beyond the minimal model.The results are shown to
hold true when next-to-leading order effects are considered.
|
[
{
"created": "Tue, 30 Jan 1996 19:39:48 GMT",
"version": "v1"
},
{
"created": "Thu, 1 Feb 1996 13:18:11 GMT",
"version": "v2"
}
] |
2009-10-28
|
[
[
"Dvali",
"Gia",
""
],
[
"Melfo",
"Alejandra",
""
],
[
"Senjanovic",
"Goran",
""
]
] |
The possibility of P and CP violation at high temperature in models where these symmetries are spontaneously broken is investigated. It is found that in minimal models that include singlet fields, high T nonrestoration is possible for a wide range of parameters of the theory, in particular in models of CP violation with a CP-odd Higgs field. The same holds true for the invisible axion version of the Peccei-Quinn mechanism. This can provide both a way out for the domain wall problem in these theories and the CP violation required for baryogenesis. In the case of spontaneous P violation it turns out that high T nonrestoration requires going beyond the minimal model.The results are shown to hold true when next-to-leading order effects are considered.
|
2106.10838
|
Sebasti\'an Urrutia Quiroga
|
Julia Harz, Michael J. Ramsey-Musolf, Tianyang Shen, Sebasti\'an
Urrutia Quiroga
|
TeV-scale Lepton Number Violation: Connecting Leptogenesis, Neutrinoless
Double Beta Decay, and Colliders
|
31 pages + appendix (5 pages), 16 figures, and 5 tables. v5: missing
reference in TeX file
| null | null |
ACFI-T21-08, TUM-HEP-1346/21
|
hep-ph
|
http://creativecommons.org/licenses/by/4.0/
|
In the context of TeV-scale lepton number violating (LNV) interactions, we
illustrate the interplay between leptogenesis, neutrinoless double beta
($0\nu\beta\beta$) decay, and LNV searches at proton-proton colliders. Using a
concrete model for illustration, we identify the parameter space where standard
thermal leptogenesis is rendered unviable due to washout processes and show how
$0\nu\beta\beta$ decay and $pp$ collisions provide complementary probes. We
find that the new particle spectrum can have a decisive impact on the relative
sensitivity of these two probes.
|
[
{
"created": "Mon, 21 Jun 2021 03:58:38 GMT",
"version": "v1"
},
{
"created": "Fri, 4 Feb 2022 19:00:01 GMT",
"version": "v2"
},
{
"created": "Mon, 28 Feb 2022 16:52:39 GMT",
"version": "v3"
},
{
"created": "Mon, 22 Jul 2024 16:12:47 GMT",
"version": "v4"
},
{
"created": "Wed, 24 Jul 2024 17:22:56 GMT",
"version": "v5"
}
] |
2024-07-25
|
[
[
"Harz",
"Julia",
""
],
[
"Ramsey-Musolf",
"Michael J.",
""
],
[
"Shen",
"Tianyang",
""
],
[
"Quiroga",
"Sebastián Urrutia",
""
]
] |
In the context of TeV-scale lepton number violating (LNV) interactions, we illustrate the interplay between leptogenesis, neutrinoless double beta ($0\nu\beta\beta$) decay, and LNV searches at proton-proton colliders. Using a concrete model for illustration, we identify the parameter space where standard thermal leptogenesis is rendered unviable due to washout processes and show how $0\nu\beta\beta$ decay and $pp$ collisions provide complementary probes. We find that the new particle spectrum can have a decisive impact on the relative sensitivity of these two probes.
|
1903.06155
|
Johannes Bl\"umlein
|
J. Bl\"umlein, A. De Freitas, C.G. Raab and K. Sch\"onwald
|
The unpolarized two-loop massive pure singlet Wilson coefficients for
deep-inelastic scattering
|
42, pages Latex, 8 Figures
| null |
10.1016/j.nuclphysb.2019.114659
|
DESY 19--038,DO--TH 18/25
|
hep-ph hep-ex hep-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We calculate the massive two--loop pure singlet Wilson coefficients for heavy
quark production in the unpolarized case analytically in the whole kinematic
region and derive the threshold and asymptotic expansions. We also recalculate
the corresponding massless two--loop Wilson coefficients. The complete
expressions contain iterated integrals with elliptic letters. The contributing
alphabets enlarge the Kummer-Poincar\'e letters by a series of square-root
valued letters. A new class of iterated integrals, the Kummer-elliptic
integrals, are introduced. For the structure functions $F_2$ and $F_L$ we also
derive improved asymptotic representations adding power corrections. Numerical
results are presented.
|
[
{
"created": "Thu, 14 Mar 2019 17:54:20 GMT",
"version": "v1"
}
] |
2019-06-12
|
[
[
"Blümlein",
"J.",
""
],
[
"De Freitas",
"A.",
""
],
[
"Raab",
"C. G.",
""
],
[
"Schönwald",
"K.",
""
]
] |
We calculate the massive two--loop pure singlet Wilson coefficients for heavy quark production in the unpolarized case analytically in the whole kinematic region and derive the threshold and asymptotic expansions. We also recalculate the corresponding massless two--loop Wilson coefficients. The complete expressions contain iterated integrals with elliptic letters. The contributing alphabets enlarge the Kummer-Poincar\'e letters by a series of square-root valued letters. A new class of iterated integrals, the Kummer-elliptic integrals, are introduced. For the structure functions $F_2$ and $F_L$ we also derive improved asymptotic representations adding power corrections. Numerical results are presented.
|
0801.1490
|
Vali Bashiry
|
V. Bashiry
|
CP-Conserving Unparticle Phase Effects on the Unpolarized and Polarized
Direct CP Asymmetry in $b \to d \ell^+\ell^-$ Transition
|
10 figures, PRD Published version
|
Phys.Rev.D77:096005,2008
|
10.1103/PhysRevD.77.096005
| null |
hep-ph
| null |
We examine the unparticle CP-conserving phase effects on the direct CP
asymmetry for both polarized and unpolarized lepton in the inclusive $b\to d
\ell^+ \ell^-$ transition, where the flavor changing neutral currents are
forbidden at tree level but are induced by one-loop penguin diagrams. The
averaged polarized and unpolarized CP asymmetries depict strong dependency on
the unparticle parameters. In particular, a sizable discrepancy corresponding
to the standard model is achieved when the scale dimension value is $1<d_{\UP}<
2$. We see that the unparticle stuff significantly enhances, suppresses or
changes the sign of the CP asymmetry depending on the definite value of the
scaling dimension $d_{\UP}$. Especially, when $d_{\UP}\sim 1.1$ the CP
asymmetries vanish.
|
[
{
"created": "Wed, 9 Jan 2008 19:31:21 GMT",
"version": "v1"
},
{
"created": "Wed, 14 May 2008 05:01:52 GMT",
"version": "v2"
}
] |
2008-11-26
|
[
[
"Bashiry",
"V.",
""
]
] |
We examine the unparticle CP-conserving phase effects on the direct CP asymmetry for both polarized and unpolarized lepton in the inclusive $b\to d \ell^+ \ell^-$ transition, where the flavor changing neutral currents are forbidden at tree level but are induced by one-loop penguin diagrams. The averaged polarized and unpolarized CP asymmetries depict strong dependency on the unparticle parameters. In particular, a sizable discrepancy corresponding to the standard model is achieved when the scale dimension value is $1<d_{\UP}< 2$. We see that the unparticle stuff significantly enhances, suppresses or changes the sign of the CP asymmetry depending on the definite value of the scaling dimension $d_{\UP}$. Especially, when $d_{\UP}\sim 1.1$ the CP asymmetries vanish.
|
0909.3521
|
A. Gynther
|
A. Gynther, A. Kurkela and A. Vuorinen
|
The N_f^3 g^6 term in the pressure of hot QCD
|
9 pages, 2 figures, revtex, v2: minor modifications and additional
references
|
Phys.Rev.D80:096002,2009
|
10.1103/PhysRevD.80.096002
|
CERN-PH-TH-2009-172, TUW-09-14
|
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We determine the first independent part of the g^6 coefficient in the weak
coupling expansion of the QCD pressure at high temperatures, the one
proportional to the maximal power of the number of quark flavors N_f. In
addition to introducing and developing computational methods that can be used
in evaluating other parts of the expansion, our calculation provides a result
that becomes dominant in the limit of large N_f and a fixed effective coupling
g_{eff}^2 = g^2 N_f/2.
|
[
{
"created": "Mon, 21 Sep 2009 09:37:17 GMT",
"version": "v1"
},
{
"created": "Fri, 25 Sep 2009 09:59:15 GMT",
"version": "v2"
}
] |
2010-06-22
|
[
[
"Gynther",
"A.",
""
],
[
"Kurkela",
"A.",
""
],
[
"Vuorinen",
"A.",
""
]
] |
We determine the first independent part of the g^6 coefficient in the weak coupling expansion of the QCD pressure at high temperatures, the one proportional to the maximal power of the number of quark flavors N_f. In addition to introducing and developing computational methods that can be used in evaluating other parts of the expansion, our calculation provides a result that becomes dominant in the limit of large N_f and a fixed effective coupling g_{eff}^2 = g^2 N_f/2.
|
hep-ph/0308266
|
Ira Z. Rothstein
|
Ira Z. Rothstein
|
TASI Lectures on Effective Field Theories
|
90 pages, typos fixed
| null | null | null |
hep-ph
| null |
These notes are a written version of a set of lectures given at TASI-02 on
the topic of effective field theories. They are meant as an introduction to
some of the latest techniques and applications in the field.
|
[
{
"created": "Tue, 26 Aug 2003 23:34:06 GMT",
"version": "v1"
},
{
"created": "Mon, 9 Feb 2004 22:39:08 GMT",
"version": "v2"
}
] |
2007-05-23
|
[
[
"Rothstein",
"Ira Z.",
""
]
] |
These notes are a written version of a set of lectures given at TASI-02 on the topic of effective field theories. They are meant as an introduction to some of the latest techniques and applications in the field.
|
hep-ph/0208187
|
Stefan Kretzer
|
S. Kretzer (Michigan State University), M.H. Reno (University of Iowa)
|
Tau neutrino deep inelastic charged current interactions
|
28 pages, 10 figures
|
Phys.Rev. D66 (2002) 113007
|
10.1103/PhysRevD.66.113007
| null |
hep-ph
| null |
The nu_mu -> nu_tau oscillation hypothesis will be tested through nu_tau
production of tau in underground neutrino telescopes as well as long-baseline
experiments. We provide the full QCD framework for the evaluation of tau
neutrino deep inelastic charged current (CC) cross sections, including
next-leading-order (NLO) corrections, charm production, tau threshold, and
target mass effects in the collinear approximation. We investigate the
violation of the Albright-Jarlskog relations for the structure functions F_4,5
which occur only in heavy lepton (tau) scattering. Integrated CC cross sections
are evaluated naively over the full phase space and with the inclusion of DIS
kinematic cuts. Uncertainties in our evaluation based on scale dependence, PDF
errors and the interplay between kinematic and dynamical power corrections are
discussed and/or quantified.
|
[
{
"created": "Wed, 21 Aug 2002 00:18:28 GMT",
"version": "v1"
}
] |
2009-11-07
|
[
[
"Kretzer",
"S.",
"",
"Michigan State University"
],
[
"Reno",
"M. H.",
"",
"University of Iowa"
]
] |
The nu_mu -> nu_tau oscillation hypothesis will be tested through nu_tau production of tau in underground neutrino telescopes as well as long-baseline experiments. We provide the full QCD framework for the evaluation of tau neutrino deep inelastic charged current (CC) cross sections, including next-leading-order (NLO) corrections, charm production, tau threshold, and target mass effects in the collinear approximation. We investigate the violation of the Albright-Jarlskog relations for the structure functions F_4,5 which occur only in heavy lepton (tau) scattering. Integrated CC cross sections are evaluated naively over the full phase space and with the inclusion of DIS kinematic cuts. Uncertainties in our evaluation based on scale dependence, PDF errors and the interplay between kinematic and dynamical power corrections are discussed and/or quantified.
|
hep-ph/0111025
|
Jean-Rene Cudell
|
J.R. Cudell, K. Kang, V.V. Ezhela, Yu.V. Kuyanov, S.B. Lugovsky, N.P.
Tkachenko, P. Gauron and B. Nicolescu
|
New measures of the quality and of the reliability of fits applied to
forward hadronic data at t=0
|
7 pages, presented by J.R. Cudell on behalf of the COMPETE
collaboration at the 6th workshop on non-perturbative QCD, American
University of Paris, 5-9 June 2001
| null |
10.1142/9789812778352_0016
| null |
hep-ph
| null |
We develop five new statistical measures of the quality of fits, which we
combine with the usual confidence level to determine the models which fit best
all available data for total cross sections and for the real part of the
forward hadronic amplitude.
|
[
{
"created": "Fri, 2 Nov 2001 13:53:54 GMT",
"version": "v1"
}
] |
2017-08-23
|
[
[
"Cudell",
"J. R.",
""
],
[
"Kang",
"K.",
""
],
[
"Ezhela",
"V. V.",
""
],
[
"Kuyanov",
"Yu. V.",
""
],
[
"Lugovsky",
"S. B.",
""
],
[
"Tkachenko",
"N. P.",
""
],
[
"Gauron",
"P.",
""
],
[
"Nicolescu",
"B.",
""
]
] |
We develop five new statistical measures of the quality of fits, which we combine with the usual confidence level to determine the models which fit best all available data for total cross sections and for the real part of the forward hadronic amplitude.
|
hep-ph/0103333
|
Xavier Calmet
|
Xavier Calmet and Harald Fritzsch (Munich U.)
|
Electroweak D-Waves
|
15 pages
|
Phys.Lett. B526 (2002) 90-96
|
10.1016/S0370-2693(01)01471-X
|
LMU 01/05
|
hep-ph
| null |
We consider phenomenological implications of a model recently proposed for
the electroweak interactions based on a SU(2)_L confining theory. We
concentrate on the production of excited states of the electroweak bosons at
future colliders and we consider their contribution to the reaction W^+ + W^-
\to W^+ + W^-. We expect large deviations from the standard model in the TeV
region.
|
[
{
"created": "Fri, 30 Mar 2001 11:29:51 GMT",
"version": "v1"
}
] |
2009-11-07
|
[
[
"Calmet",
"Xavier",
"",
"Munich U."
],
[
"Fritzsch",
"Harald",
"",
"Munich U."
]
] |
We consider phenomenological implications of a model recently proposed for the electroweak interactions based on a SU(2)_L confining theory. We concentrate on the production of excited states of the electroweak bosons at future colliders and we consider their contribution to the reaction W^+ + W^- \to W^+ + W^-. We expect large deviations from the standard model in the TeV region.
|
hep-ph/0111292
|
Axel de la Macorra
|
A. de la Macorra
|
Quintessence Unification Models from Non-Abelian Gauge Dynamics
|
18 pages, LaTeX, 3 figures, minor changes, subsections added (for
presentation purpose)
|
JHEP 0301:033,2003
|
10.1088/1126-6708/2003/01/033
| null |
hep-ph astro-ph hep-th
| null |
We show that the condensates of a non-abelian gauge group, unified with the
standard model gauge groups, can parameterize the present day cosmological
constant and play the role of quintessence. The models agree with SN1a and
recent CMB analysis.
These models have {\it no free} parameters. Even the initial energy density
at the unification scale and at the condensation scale are fixed by the number
of degrees of freedom of the gauge group (i.e. by $N_c, N_f$). The values of
$N_c, N_f$ are determined by imposing gauge coupling unification and the number
of models is quite limited. Using Affleck-Dine-Seiberg superpotential one
obtains a scalar potential $V=\Lm_c^{4+n}\phi^{-n}$. Models with $2<n<4.27$ or
equivalently $2\times 10^{-2} GeV < \Lm_c < 6 \times 10^3 GeV$ do not satisfy
the unification constrain. In fact, there are only three models and they have
an inverse power potential with $6/11 \leq n \leq 2/3$. Imposing primordial
nucleosynthesis bounds the preferred model has $N_c=3, N_f=6$, with $n=2/3$, a
condensation scale $\Lm_c=4.2\times 10^{-8} GeV$ and $\wpo=-0.90$ with an
average value $\weff=-0.93$. Notice that the tracker solution is not a good
approximation since it has $w_{tr}=-\fr{2}{n+2}=-0.75$ for $n=2/3$.
We study the evolution of all fields from the unification scale and we
calculate the relevant cosmological quantities. We also discuss the
supersymmetry breaking mechanism which is relevant for these models.
|
[
{
"created": "Thu, 22 Nov 2001 21:01:23 GMT",
"version": "v1"
},
{
"created": "Wed, 15 May 2002 23:11:53 GMT",
"version": "v2"
},
{
"created": "Tue, 22 Oct 2002 01:04:42 GMT",
"version": "v3"
}
] |
2014-11-17
|
[
[
"de la Macorra",
"A.",
""
]
] |
We show that the condensates of a non-abelian gauge group, unified with the standard model gauge groups, can parameterize the present day cosmological constant and play the role of quintessence. The models agree with SN1a and recent CMB analysis. These models have {\it no free} parameters. Even the initial energy density at the unification scale and at the condensation scale are fixed by the number of degrees of freedom of the gauge group (i.e. by $N_c, N_f$). The values of $N_c, N_f$ are determined by imposing gauge coupling unification and the number of models is quite limited. Using Affleck-Dine-Seiberg superpotential one obtains a scalar potential $V=\Lm_c^{4+n}\phi^{-n}$. Models with $2<n<4.27$ or equivalently $2\times 10^{-2} GeV < \Lm_c < 6 \times 10^3 GeV$ do not satisfy the unification constrain. In fact, there are only three models and they have an inverse power potential with $6/11 \leq n \leq 2/3$. Imposing primordial nucleosynthesis bounds the preferred model has $N_c=3, N_f=6$, with $n=2/3$, a condensation scale $\Lm_c=4.2\times 10^{-8} GeV$ and $\wpo=-0.90$ with an average value $\weff=-0.93$. Notice that the tracker solution is not a good approximation since it has $w_{tr}=-\fr{2}{n+2}=-0.75$ for $n=2/3$. We study the evolution of all fields from the unification scale and we calculate the relevant cosmological quantities. We also discuss the supersymmetry breaking mechanism which is relevant for these models.
|
hep-ph/0601076
|
Thomas Heinzl
|
T. Heinzl, B. Liesfeld, K.-U. Amthor, H. Schwoerer, R. Sauerbrey and
A. Wipf
|
On the Observation of Vacuum Birefringence
|
4 pages, 4 figures
|
Opt.Commun. 267 (2006) 318-321
|
10.1016/j.optcom.2006.06.053
| null |
hep-ph hep-ex
| null |
We suggest an experiment to observe vacuum birefringence induced by intense
laser fields. A high-intensity laser pulse is focused to ultra-relativistic
intensity and polarizes the vacuum which then acts like a birefringent medium.
The latter is probed by a linearly polarized x-ray pulse. We calculate the
resulting ellipticity signal within strong-field QED assuming Gaussian beams.
The laser technology required for detecting the signal will be available within
the next three years.
|
[
{
"created": "Tue, 10 Jan 2006 15:46:36 GMT",
"version": "v1"
}
] |
2009-11-11
|
[
[
"Heinzl",
"T.",
""
],
[
"Liesfeld",
"B.",
""
],
[
"Amthor",
"K. -U.",
""
],
[
"Schwoerer",
"H.",
""
],
[
"Sauerbrey",
"R.",
""
],
[
"Wipf",
"A.",
""
]
] |
We suggest an experiment to observe vacuum birefringence induced by intense laser fields. A high-intensity laser pulse is focused to ultra-relativistic intensity and polarizes the vacuum which then acts like a birefringent medium. The latter is probed by a linearly polarized x-ray pulse. We calculate the resulting ellipticity signal within strong-field QED assuming Gaussian beams. The laser technology required for detecting the signal will be available within the next three years.
|
1907.07728
|
Rahul Srivastava
|
Sanjoy Mandal, Nicol\'as Rojas, Rahul Srivastava, Jos\'e W. F. Valle
|
Dark matter as the origin of neutrino mass in the inverse seesaw
mechanism
|
23 pages, 5 tables, 12 figures. Substantially expanded version,
including detailed phenomenology discussion. Model and conclusions unchanged.
New author added. Version matches the published version
|
Phys. Lett. B, 821, (2021), 136609
|
10.1016/j.physletb.2021.136609
|
IFIC/19-XXX
|
hep-ph astro-ph.CO
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We propose that neutrino masses are "seeded" by a dark sector within the
inverse seesaw mechanism. This way we have a new, "hidden", variant of the
scotogenic scenario for radiative neutrino masses. We discuss both explicit and
dynamical lepton number violation. In addition to invisible Higgs decays with
majoron emission, we discuss in detail the pheneomenolgy of dark matter, as
well as the novel features associated to charged lepton flavour violation, and
neutrino physics.
|
[
{
"created": "Wed, 17 Jul 2019 19:16:38 GMT",
"version": "v1"
},
{
"created": "Tue, 7 Sep 2021 11:50:00 GMT",
"version": "v2"
}
] |
2021-09-08
|
[
[
"Mandal",
"Sanjoy",
""
],
[
"Rojas",
"Nicolás",
""
],
[
"Srivastava",
"Rahul",
""
],
[
"Valle",
"José W. F.",
""
]
] |
We propose that neutrino masses are "seeded" by a dark sector within the inverse seesaw mechanism. This way we have a new, "hidden", variant of the scotogenic scenario for radiative neutrino masses. We discuss both explicit and dynamical lepton number violation. In addition to invisible Higgs decays with majoron emission, we discuss in detail the pheneomenolgy of dark matter, as well as the novel features associated to charged lepton flavour violation, and neutrino physics.
|
hep-ph/0306081
|
Vladimir Sauli
|
Vladimir Sauli
|
Running coupling and fermion mass in strong coupling QED
|
23 pages, 4 figures, v4: revised and extended version, one
introductory section added
|
J.Phys.G30:739-758,2004
|
10.1088/0954-3899/30/6/005
| null |
hep-ph
| null |
Simple toy model is used in order to exhibit the technique of extracting the
non-perturbative information about Green's functions in Minkowski space. The
effective charge and the dynamical electron mass are calculated in strong
coupling 3+1 QED by solving the coupled Dyson-Schwinger equations for electron
and photon propagators. The minimal Ball-Chiu vertex was used for simplicity
and we impose the Landau gauge fixing on QED action. The solution obtained
separately in Euclidean and Minkowski space were compared, the latter one was
extracted with the help of spectral technique.
|
[
{
"created": "Tue, 10 Jun 2003 13:04:36 GMT",
"version": "v1"
},
{
"created": "Fri, 1 Aug 2003 15:12:31 GMT",
"version": "v2"
},
{
"created": "Tue, 14 Oct 2003 16:49:54 GMT",
"version": "v3"
},
{
"created": "Wed, 28 Jan 2004 12:32:05 GMT",
"version": "v4"
}
] |
2008-11-26
|
[
[
"Sauli",
"Vladimir",
""
]
] |
Simple toy model is used in order to exhibit the technique of extracting the non-perturbative information about Green's functions in Minkowski space. The effective charge and the dynamical electron mass are calculated in strong coupling 3+1 QED by solving the coupled Dyson-Schwinger equations for electron and photon propagators. The minimal Ball-Chiu vertex was used for simplicity and we impose the Landau gauge fixing on QED action. The solution obtained separately in Euclidean and Minkowski space were compared, the latter one was extracted with the help of spectral technique.
|
1308.3158
|
Xiang Liu
|
Xiao Wang, Yuan Sun, Dian-Yong Chen, Xiang Liu and Takayuki Matsuki
|
Simulating the charged charmoniumlike structure $Z_c(4025)$
|
5 pages, 4 figures. Title changed and more discussed added. Accepted
by Eur. Phys. J. C
|
Eur. Phys. J. C 74, 2761 (2014)
|
10.1140/epjc/s10052-014-2761-2
| null |
hep-ph hep-ex
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Inspired by recent observation of charged charmoniumlike structure
$Z_c(4025)$, we explore the $Y(4260)\to (D^*\bar{D}^*)^- \pi^+$ decay through
the initial-single-pion-emission mechanism, where the $D^*\bar{D}^*\to
D^*\bar{D}^*$ interaction is studied by the ladder approximation including a
non-interacting case. Our calculation of the differential decay width for
$Y(4260)\to (D^*\bar{D}^*)^- \pi^+$ indicates that a charged enhancement
structure around $D^*\bar{D}^*$ appears in the $D^*\bar{D}^*$ invariant mass
spectrum for this process, which can correspond to newly observed $Z_c(4025)$
structure.
|
[
{
"created": "Wed, 14 Aug 2013 15:43:41 GMT",
"version": "v1"
},
{
"created": "Thu, 30 Jan 2014 04:58:20 GMT",
"version": "v2"
}
] |
2014-02-17
|
[
[
"Wang",
"Xiao",
""
],
[
"Sun",
"Yuan",
""
],
[
"Chen",
"Dian-Yong",
""
],
[
"Liu",
"Xiang",
""
],
[
"Matsuki",
"Takayuki",
""
]
] |
Inspired by recent observation of charged charmoniumlike structure $Z_c(4025)$, we explore the $Y(4260)\to (D^*\bar{D}^*)^- \pi^+$ decay through the initial-single-pion-emission mechanism, where the $D^*\bar{D}^*\to D^*\bar{D}^*$ interaction is studied by the ladder approximation including a non-interacting case. Our calculation of the differential decay width for $Y(4260)\to (D^*\bar{D}^*)^- \pi^+$ indicates that a charged enhancement structure around $D^*\bar{D}^*$ appears in the $D^*\bar{D}^*$ invariant mass spectrum for this process, which can correspond to newly observed $Z_c(4025)$ structure.
|
hep-ph/0103275
|
Dmitri Ivanov
|
V.M. Braun, D.Yu. Ivanov, A. Schaefer, L. Szymanowski
|
QCD factorization for the pion diffractive dissociation to two jets
|
Original version from 9 April restored
|
Phys.Lett. B509 (2001) 43-52
|
10.1016/S0370-2693(01)00554-8
| null |
hep-ph
| null |
We calculate the cross section of a pion diffraction dissociation in two jets
with large transverse momenta originating from a hard gluon exchange between
the pion constituents. To the leading logarithmic accuracy (in energy), the
contribution coming from small transverse separations between the quark and the
antiquark in the pion acquires the expected factorized form, the longitudinal
momentum distribution of the jets being proportional to the pion distribution
amplitude. The hard gluon exchange can in this case be considered as a part of
the unintegrated gluon distribution. Beyond the leading logarithms (in energy)
this proportionality does not hold. Moreover, the collinear factorization
appears to be broken by the end-point singularities. Remarkably enough, the
longitudinal momentum distribution of the jets for the non-factorizable
contribution is calculable, and turns out to be the same as for the
factorizable contribution with the asymptotic pion distribution amplitude.
|
[
{
"created": "Mon, 26 Mar 2001 18:06:07 GMT",
"version": "v1"
},
{
"created": "Mon, 9 Apr 2001 10:12:28 GMT",
"version": "v2"
},
{
"created": "Thu, 24 May 2001 15:58:12 GMT",
"version": "v3"
},
{
"created": "Thu, 9 Aug 2001 12:24:25 GMT",
"version": "v4"
}
] |
2009-11-07
|
[
[
"Braun",
"V. M.",
""
],
[
"Ivanov",
"D. Yu.",
""
],
[
"Schaefer",
"A.",
""
],
[
"Szymanowski",
"L.",
""
]
] |
We calculate the cross section of a pion diffraction dissociation in two jets with large transverse momenta originating from a hard gluon exchange between the pion constituents. To the leading logarithmic accuracy (in energy), the contribution coming from small transverse separations between the quark and the antiquark in the pion acquires the expected factorized form, the longitudinal momentum distribution of the jets being proportional to the pion distribution amplitude. The hard gluon exchange can in this case be considered as a part of the unintegrated gluon distribution. Beyond the leading logarithms (in energy) this proportionality does not hold. Moreover, the collinear factorization appears to be broken by the end-point singularities. Remarkably enough, the longitudinal momentum distribution of the jets for the non-factorizable contribution is calculable, and turns out to be the same as for the factorizable contribution with the asymptotic pion distribution amplitude.
|
hep-ph/0401218
|
Vicente Vento
|
Vicente Vento
|
The scalar glueball spectrum
|
11 pages: New title, figure, table and a more detailed comparison
with experiments
|
Phys.Rev.D73:054006,2006
|
10.1103/PhysRevD.73.054006
| null |
hep-ph
| null |
We discuss scenarios for scalar glueballs using arguments based on sum rules,
spectral decomposition, the $\frac{1}{N_c}$ approximation, the scales of the
strong interaction and the topology of the flux tubes. We analyze the
phenomenological support of those scenarios and their observational
implications. Our investigations hint a rich low lying glueball spectrum.
|
[
{
"created": "Tue, 27 Jan 2004 17:30:04 GMT",
"version": "v1"
},
{
"created": "Wed, 14 Apr 2004 16:12:57 GMT",
"version": "v2"
},
{
"created": "Wed, 1 Jun 2005 09:45:44 GMT",
"version": "v3"
}
] |
2008-11-26
|
[
[
"Vento",
"Vicente",
""
]
] |
We discuss scenarios for scalar glueballs using arguments based on sum rules, spectral decomposition, the $\frac{1}{N_c}$ approximation, the scales of the strong interaction and the topology of the flux tubes. We analyze the phenomenological support of those scenarios and their observational implications. Our investigations hint a rich low lying glueball spectrum.
|
hep-ph/0605315
|
Taizan Watari
|
Radu Tatar and Taizan Watari
|
A Stable Proton without R-Parity--Implications for the LSP--
|
13 pages, including 3 figures
|
Phys.Lett.B646:258-264,2007
|
10.1016/j.physletb.2007.01.020
|
LTH 705, UCB-PTH-06/08, LBNL-60200
|
hep-ph
| null |
The proton decays too rapidly in supersymmetric theories if a dimension-4
operator \bar{5}.10.\bar{5} exists in the superpotential. The conventional idea
is to impose the R-parity to kill this operator with a stable lightest
supersymmetry particle (LSP) as a direct consequence. However, the SUSY-zero
mechanism is also able to kill the operator without an unbroken R-parity. In
this article, we provide a firm theoretical justification for the absence of
the dimension-4 proton decay operator under the SUSY-zero mechanism, by using
some input from string theory. The LSP may be unstable without the R-parity
and, indeed, some dimension-5 R-parity violating operators may be generated in
effective theories. This suggests that the dark matter is an axion in this
string theory inspired model. An insight on the SUSY-zero mechanism is also
obtained.
|
[
{
"created": "Mon, 29 May 2006 15:01:07 GMT",
"version": "v1"
}
] |
2008-11-26
|
[
[
"Tatar",
"Radu",
""
],
[
"Watari",
"Taizan",
""
]
] |
The proton decays too rapidly in supersymmetric theories if a dimension-4 operator \bar{5}.10.\bar{5} exists in the superpotential. The conventional idea is to impose the R-parity to kill this operator with a stable lightest supersymmetry particle (LSP) as a direct consequence. However, the SUSY-zero mechanism is also able to kill the operator without an unbroken R-parity. In this article, we provide a firm theoretical justification for the absence of the dimension-4 proton decay operator under the SUSY-zero mechanism, by using some input from string theory. The LSP may be unstable without the R-parity and, indeed, some dimension-5 R-parity violating operators may be generated in effective theories. This suggests that the dark matter is an axion in this string theory inspired model. An insight on the SUSY-zero mechanism is also obtained.
|
2301.07089
|
Valery Telnov
|
K.I. Beloborodov (1 and 2), T.A. Kharlamova (1 and 2), V.I. Telnov (1
and 2) ((1) Budker Institute of Nuclear Physics, Novosibirsk, Russia, (2)
Novosibirsk State University, Novosibirsk, Russia)
|
Problems of studying $\gamma \gamma \to \gamma\gamma$ scattering at
$e^+e^-$ and $\gamma\gamma$ colliders
| null | null | null | null |
hep-ph hep-ex physics.acc-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
The process of elastic scattering of photons (light-by-light scattering)
attracts a lot of attention in the last years. It goes via the loop and all
charged particles contributes to its cross section. Theoretical prediction of
the cross section have existed for more than half a century, there are various
accelerators with real and virtual photons, but only recently this process was
discovered at the LHC in ion-ion collisions. Hopes for further study of this
process are associated with high-luminosity $e^+e^-$ colliders (SuperKEKb, FCC,
ILC, CLIC) and gamma-gamma colliders based on the Compton scattering of laser
photons on electrons. In this article, we show that there is very serious
background processes when the final pair of photons is created in the
annihilation of real and virtual $e^+$ and $e^-$, and the remaining products
fly away from the detector at small angles.
|
[
{
"created": "Tue, 17 Jan 2023 18:54:53 GMT",
"version": "v1"
}
] |
2023-01-18
|
[
[
"Beloborodov",
"K. I.",
"",
"1 and 2"
],
[
"Kharlamova",
"T. A.",
"",
"1 and 2"
],
[
"Telnov",
"V. I.",
"",
"1\n and 2"
]
] |
The process of elastic scattering of photons (light-by-light scattering) attracts a lot of attention in the last years. It goes via the loop and all charged particles contributes to its cross section. Theoretical prediction of the cross section have existed for more than half a century, there are various accelerators with real and virtual photons, but only recently this process was discovered at the LHC in ion-ion collisions. Hopes for further study of this process are associated with high-luminosity $e^+e^-$ colliders (SuperKEKb, FCC, ILC, CLIC) and gamma-gamma colliders based on the Compton scattering of laser photons on electrons. In this article, we show that there is very serious background processes when the final pair of photons is created in the annihilation of real and virtual $e^+$ and $e^-$, and the remaining products fly away from the detector at small angles.
|
1005.4684
|
Min-Seok Seo
|
Jihn E. Kim and Min-Seok Seo
|
Quark and lepton mixing angles with a dodeca-symmetry
|
15 pages, 2 figures
|
JHEP 1102:097,2011
|
10.1007/JHEP02(2011)097
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
The discrete symmetry D_12 at the electroweak scale is used to fix the quark
and lepton mixing angles. At the leading order, the Cabbibo angle theta_C is
15^o, and the PMNS matrix is of a bi-dodeca-mixing form giving the
Solar-neutrino angle theta_sol=30^o. Thus, there results the relation
theta_sol+theta_C ~ 45^o. Out of discrete vacua, a certain vacuum is chosen for
this assignment to be consistent with the dodeca-symmetry. A shift of theta_C
from 15^o to 13.14^o might arise from a small breaking of the dodeca-symmetry.
The spontaneous breaking leading to the required electroweak vacuum is made
possible by introducing an additional parity in an effective field approach or
by realizing the electroweak dodeca-symmetry explicitly at a high energy scale.
At the vacuum we chose Arg.Det.M_q is nonzero, and hence a solution of the
strong CP problem invites a very light axion at a high energy scale. We also
comment how the next level corrections can fit the mixing angles to the
observed values.
|
[
{
"created": "Tue, 25 May 2010 20:01:17 GMT",
"version": "v1"
},
{
"created": "Sat, 26 Feb 2011 07:35:11 GMT",
"version": "v2"
}
] |
2011-03-01
|
[
[
"Kim",
"Jihn E.",
""
],
[
"Seo",
"Min-Seok",
""
]
] |
The discrete symmetry D_12 at the electroweak scale is used to fix the quark and lepton mixing angles. At the leading order, the Cabbibo angle theta_C is 15^o, and the PMNS matrix is of a bi-dodeca-mixing form giving the Solar-neutrino angle theta_sol=30^o. Thus, there results the relation theta_sol+theta_C ~ 45^o. Out of discrete vacua, a certain vacuum is chosen for this assignment to be consistent with the dodeca-symmetry. A shift of theta_C from 15^o to 13.14^o might arise from a small breaking of the dodeca-symmetry. The spontaneous breaking leading to the required electroweak vacuum is made possible by introducing an additional parity in an effective field approach or by realizing the electroweak dodeca-symmetry explicitly at a high energy scale. At the vacuum we chose Arg.Det.M_q is nonzero, and hence a solution of the strong CP problem invites a very light axion at a high energy scale. We also comment how the next level corrections can fit the mixing angles to the observed values.
|
2012.12579
|
Andrea Gallo Rosso
|
A. Gallo Rosso
|
Supernova neutrino fluxes in HALO-1kT, Super-Kamiokande, and JUNO
|
Revised model 9.6 solar masses. Figures and tables updated, results
unchanged
|
JCAP06(2021)046
|
10.1088/1475-7516/2021/06/046
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
When the next galactic core-collapse supernova occurs, we must be ready to
obtain as much information as possible. Although many present and future
detectors are well equipped to detect $\overline{\nu}_{\mathrm{e}}$ and $\nu_x$
neutrinos, the detection of the $\nu_{\mathrm{e}}$ species presents the biggest
challenges. We assess the impact that a 1 ktonne lead-based detector, such as
HALO-1kT, can have in constraining electron neutrino time-integrated fluxes.
The study involves the detector taken alone as well as when combined with
massive $\overline{\nu}_{\mathrm{e}}$-sensitive detectors such as
Super-Kamiokande and JUNO. We find that HALO-1kT alone is not able to strongly
constrain the emission parameters. When combined with other detectors, however,
the orthogonal information might be helpful in improving the $\nu_{\mathrm{e}}$
total emitted energy and mean energy accuracy, up to about $50\%$, if no other
$\nu_{\mathrm{e}}$-sensitive channel is implemented. A discussion on the
reconstruction of $\overline{\nu}_{\mathrm{e}}$ and $\nu_x$ species, as well as
the total emitted energy, is also presented.
|
[
{
"created": "Wed, 23 Dec 2020 10:09:57 GMT",
"version": "v1"
},
{
"created": "Wed, 30 Jun 2021 12:42:27 GMT",
"version": "v2"
}
] |
2021-07-01
|
[
[
"Rosso",
"A. Gallo",
""
]
] |
When the next galactic core-collapse supernova occurs, we must be ready to obtain as much information as possible. Although many present and future detectors are well equipped to detect $\overline{\nu}_{\mathrm{e}}$ and $\nu_x$ neutrinos, the detection of the $\nu_{\mathrm{e}}$ species presents the biggest challenges. We assess the impact that a 1 ktonne lead-based detector, such as HALO-1kT, can have in constraining electron neutrino time-integrated fluxes. The study involves the detector taken alone as well as when combined with massive $\overline{\nu}_{\mathrm{e}}$-sensitive detectors such as Super-Kamiokande and JUNO. We find that HALO-1kT alone is not able to strongly constrain the emission parameters. When combined with other detectors, however, the orthogonal information might be helpful in improving the $\nu_{\mathrm{e}}$ total emitted energy and mean energy accuracy, up to about $50\%$, if no other $\nu_{\mathrm{e}}$-sensitive channel is implemented. A discussion on the reconstruction of $\overline{\nu}_{\mathrm{e}}$ and $\nu_x$ species, as well as the total emitted energy, is also presented.
|
hep-ph/9410220
|
Kenzo Inoue
|
Kenzo Inoue
|
Generations of Quarks and Leptons from Noncompact Horizontal Symmetry
|
22 pages, e-mail: inoue@yukawa.kyoto-u.ac.jp , Plain Tex, YITP/K-1089
|
Prog.Theor.Phys. 93 (1995) 403-416
|
10.1143/PTP.93.403
| null |
hep-ph
| null |
The three chiral generations of quarks and leptons may be generated through a
spontaneous breakdown of the noncompact horizontal gauge symmetry $G_{H}$ which
governs, together with the standard gauge symmetry ${SU(3) \times SU(2) \times
U(1)}$, the world in a vectorlike manner. In a framework of supersymmetric
theory, the simplest choice ${G_{H}=SU(1,1)}$ works quite well for this
scenario in which quarks, leptons and Higgses belong to infinite dimensional
unitary representation of $SU(1,1)$. The relevance of the scenario to the
hierarchical structure of their Yukawa coupling matrices are discussed.
|
[
{
"created": "Wed, 5 Oct 1994 01:07:15 GMT",
"version": "v1"
},
{
"created": "Wed, 12 Oct 1994 03:36:18 GMT",
"version": "v2"
}
] |
2009-10-28
|
[
[
"Inoue",
"Kenzo",
""
]
] |
The three chiral generations of quarks and leptons may be generated through a spontaneous breakdown of the noncompact horizontal gauge symmetry $G_{H}$ which governs, together with the standard gauge symmetry ${SU(3) \times SU(2) \times U(1)}$, the world in a vectorlike manner. In a framework of supersymmetric theory, the simplest choice ${G_{H}=SU(1,1)}$ works quite well for this scenario in which quarks, leptons and Higgses belong to infinite dimensional unitary representation of $SU(1,1)$. The relevance of the scenario to the hierarchical structure of their Yukawa coupling matrices are discussed.
|
hep-ph/0406082
|
Volodymyr Magas
|
L.P. Csernai, V.K. Magas, E. Molnar, A. Nyiri and K. Tamosiunas
|
Freeze Out and the Boltzmann Transport Equation
|
More explanations about the Modified Boltzmann Transport Equation are
added. 5 pages, 1 figure. Please note that there is a more detailed paper on
the Modified Boltzmann Transport Equation published in the ArXiv:
hep-ph/0502185
| null | null | null |
hep-ph
| null |
Recently several works have appeared in the literature that addressed the
problem of Freeze Out in energetic heavy ion reaction and aimed for a
description based on the Boltzmann Transport Equation (BTE). In this paper we
develop a dynamical Freeze-Out description, starting from the BTE, pointing out
the basic limitations of the BTE approach, and the points where the BTE
approach should be modified.
|
[
{
"created": "Mon, 7 Jun 2004 15:39:09 GMT",
"version": "v1"
},
{
"created": "Sun, 20 Feb 2005 17:56:12 GMT",
"version": "v2"
}
] |
2007-05-23
|
[
[
"Csernai",
"L. P.",
""
],
[
"Magas",
"V. K.",
""
],
[
"Molnar",
"E.",
""
],
[
"Nyiri",
"A.",
""
],
[
"Tamosiunas",
"K.",
""
]
] |
Recently several works have appeared in the literature that addressed the problem of Freeze Out in energetic heavy ion reaction and aimed for a description based on the Boltzmann Transport Equation (BTE). In this paper we develop a dynamical Freeze-Out description, starting from the BTE, pointing out the basic limitations of the BTE approach, and the points where the BTE approach should be modified.
|
2008.06364
|
Carlo Oleari
|
Paolo Nason, Carlo Oleari, Marco Rocco, Marco Zaro
|
An interface between the POWHEG BOX and MadGraph5_aMC@NLO
|
20 pages, 13 figures
| null |
10.1140/epjc/s10052-020-08559-7
| null |
hep-ph
|
http://creativecommons.org/licenses/by/4.0/
|
In this paper we present a framework for developing POWHEG BOX generators
using MadGraph5_aMC@NLO for the computation of the matrix elements. Within this
framework, all the flexibility of MadGraph5_aMC@NLO for the generation of
matrix elements for Standard Model processes and for several of its extensions
can be exploited, as well as all features of the POWHEG BOX framework,
including the possibility of multijet merging without a merging scale (using
the so called MiNLO approach). As a proof of concept, we develop a generator
for the production of a spin-0 Higgs-like boson in association with up to two
jets, with CP-violating couplings.
|
[
{
"created": "Fri, 14 Aug 2020 13:31:25 GMT",
"version": "v1"
}
] |
2020-12-02
|
[
[
"Nason",
"Paolo",
""
],
[
"Oleari",
"Carlo",
""
],
[
"Rocco",
"Marco",
""
],
[
"Zaro",
"Marco",
""
]
] |
In this paper we present a framework for developing POWHEG BOX generators using MadGraph5_aMC@NLO for the computation of the matrix elements. Within this framework, all the flexibility of MadGraph5_aMC@NLO for the generation of matrix elements for Standard Model processes and for several of its extensions can be exploited, as well as all features of the POWHEG BOX framework, including the possibility of multijet merging without a merging scale (using the so called MiNLO approach). As a proof of concept, we develop a generator for the production of a spin-0 Higgs-like boson in association with up to two jets, with CP-violating couplings.
|
1107.2670
|
Florian Staub
|
Renato M. Fonseca, Michal Malinsky, Werner Porod, Florian Staub
|
Running soft parameters in SUSY models with multiple U(1) gauge factors
|
18 pages, 10 figures; v2: matches published version; v3: corrected
eqs. (21) and (35), changed text in sec. 3.B accordingly
|
Nuclear Physics, Section B 854 (2012), pp. 28-53
|
10.1016/j.nuclphysb.2011.08.017
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We generalize the two-loop renormalization group equations for the parameters
of the softly broken SUSY gauge theories given in the literature to the most
general case when the gauge group contains more than a single abelian gauge
factor. The complete method is illustrated at two-loop within a specific
example and compared to some of the previously proposed partial treatments.
|
[
{
"created": "Wed, 13 Jul 2011 20:34:36 GMT",
"version": "v1"
},
{
"created": "Mon, 26 Sep 2011 15:33:37 GMT",
"version": "v2"
},
{
"created": "Wed, 19 Sep 2012 17:28:41 GMT",
"version": "v3"
}
] |
2012-09-20
|
[
[
"Fonseca",
"Renato M.",
""
],
[
"Malinsky",
"Michal",
""
],
[
"Porod",
"Werner",
""
],
[
"Staub",
"Florian",
""
]
] |
We generalize the two-loop renormalization group equations for the parameters of the softly broken SUSY gauge theories given in the literature to the most general case when the gauge group contains more than a single abelian gauge factor. The complete method is illustrated at two-loop within a specific example and compared to some of the previously proposed partial treatments.
|
1106.3189
|
Guido Altarelli
|
G. Altarelli
|
The Early Days of QCD (as seen from Rome)
|
8 pages, 2 figures. Talk in honour of Mario Greco presented at the
Rencontres de la Vallee d'Aoste 2011, La Thuile, Italy
| null |
10.1393/ncc/i2012-11159-y
|
RM3-TH/11-03, CERN-PH-TH/2011-140
|
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
In honour of Mario Greco I present my recollections on the QCD studies in
Rome in the '70's and early 80's and on our very friendly group of people
involved.
|
[
{
"created": "Thu, 16 Jun 2011 10:10:19 GMT",
"version": "v1"
}
] |
2022-03-02
|
[
[
"Altarelli",
"G.",
""
]
] |
In honour of Mario Greco I present my recollections on the QCD studies in Rome in the '70's and early 80's and on our very friendly group of people involved.
|
1301.3339
|
Elena G. Ferreiro
|
A. Capella and E. G. Ferreiro
|
Proton-proton multiplicity distributions at LHC and the Pomeron
intercept
|
6 pages, 2 figures
| null | null | null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We compute the proton-proton multiplicity distributions at LHC energies in
the framework of a multiple scattering model assuming a Poisson distribution
for each inelastic collision. Multiple scattering is essential to broaden the
multiplicity distribution. We obtain approximate KNO scaling for small
pseudo-rapidity intervals ($|\eta | < 0.5$) and sizable KNO scaling violations
for larger ones, in agreement with experiment.
|
[
{
"created": "Tue, 15 Jan 2013 13:22:34 GMT",
"version": "v1"
}
] |
2013-01-16
|
[
[
"Capella",
"A.",
""
],
[
"Ferreiro",
"E. G.",
""
]
] |
We compute the proton-proton multiplicity distributions at LHC energies in the framework of a multiple scattering model assuming a Poisson distribution for each inelastic collision. Multiple scattering is essential to broaden the multiplicity distribution. We obtain approximate KNO scaling for small pseudo-rapidity intervals ($|\eta | < 0.5$) and sizable KNO scaling violations for larger ones, in agreement with experiment.
|
2001.01726
|
Haowu Duan
|
Haowu Duan, Candost Akkaya, Alex Kovner, and Vladimir V. Skokov
|
Entanglement, partial set of measurements, and diagonality of the
density matrix in the parton model
|
11 pages, 1 figure; version accepted to Phys. Rev. D
|
Phys. Rev. D 101, 036017 (2020)
|
10.1103/PhysRevD.101.036017
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We define the "entropy of ignorance" which quantifies the entropy associated
with ability to perform only a partial set of measurement on a quantum system.
For a parton model the entropy of ignorance is equal to a Boltzmann entropy of
a classical system of partons. We analyze a calculable model used for
describing low x gluons in Color Glass Condensate approach, which has
similarities with the parton model of QCD. In this model we calculate the
entropy of ignorance in the particle number basis as well as the entanglement
entropy of the observable degrees of freedom. We find that the two are similar
at high momenta, but differ by a factor of order unity at low momenta. This
holds for the Renyi as well as von Neumann entropies. We conclude that the
entanglement does not seem to play an important role in the context of the
parton model.
|
[
{
"created": "Mon, 6 Jan 2020 19:00:02 GMT",
"version": "v1"
},
{
"created": "Tue, 3 Mar 2020 19:19:26 GMT",
"version": "v2"
}
] |
2020-03-05
|
[
[
"Duan",
"Haowu",
""
],
[
"Akkaya",
"Candost",
""
],
[
"Kovner",
"Alex",
""
],
[
"Skokov",
"Vladimir V.",
""
]
] |
We define the "entropy of ignorance" which quantifies the entropy associated with ability to perform only a partial set of measurement on a quantum system. For a parton model the entropy of ignorance is equal to a Boltzmann entropy of a classical system of partons. We analyze a calculable model used for describing low x gluons in Color Glass Condensate approach, which has similarities with the parton model of QCD. In this model we calculate the entropy of ignorance in the particle number basis as well as the entanglement entropy of the observable degrees of freedom. We find that the two are similar at high momenta, but differ by a factor of order unity at low momenta. This holds for the Renyi as well as von Neumann entropies. We conclude that the entanglement does not seem to play an important role in the context of the parton model.
|
hep-ph/0008003
|
Alejandro Cabo Montes De Oca
|
Alejandro Cabo and Marcos Rigol
|
Constituent quark masses from a modified perturbative QCD
|
Revtex 4, 29 pages, 4 tables, 6 eps figures, extended version of a
letter. Title changed, content and references added, two figures improved
|
Eur. Phys. J. C23, 289 (2002)
|
10.1007/s100520100879
| null |
hep-ph
| null |
A recently proposed modified perturbative expansion for QCD incorporating
gluon condensation is employed to evaluate the quark and gluon self-energy
corrections in the first approximations. The results predict mass values of 1/3
of the nucleon mass for the light quarks u, d, and s and a monotonously growing
variation with the current mass. The only phenomenological input consists in
that <G^2> is evaluated up to order g^2 as a function of the unique parameter C
defining the modified propagator and then C is fixed to give a current estimate
of <g^2 G^2>. The light quarks u and d result to be confined and the s, c, b
and t ones show damped propagation modes, then suggesting a model for the large
differences in stability between the nucleons and the higher resonances. The
above properties of quark modes diverge from the fully confinement result
following from the similar gluon propagator previously considered by Munczek
and Nemirovski. On another hand, the condensate effects on the gluon
self-energy furnish a tachionic mass shell as predicted by the Fukuda analysis
of gluon condensation in QCD.
|
[
{
"created": "Tue, 1 Aug 2000 09:33:27 GMT",
"version": "v1"
},
{
"created": "Wed, 14 Feb 2001 18:03:55 GMT",
"version": "v2"
},
{
"created": "Mon, 7 Jan 2002 10:51:09 GMT",
"version": "v3"
},
{
"created": "Wed, 22 May 2002 07:58:31 GMT",
"version": "v4"
}
] |
2009-10-31
|
[
[
"Cabo",
"Alejandro",
""
],
[
"Rigol",
"Marcos",
""
]
] |
A recently proposed modified perturbative expansion for QCD incorporating gluon condensation is employed to evaluate the quark and gluon self-energy corrections in the first approximations. The results predict mass values of 1/3 of the nucleon mass for the light quarks u, d, and s and a monotonously growing variation with the current mass. The only phenomenological input consists in that <G^2> is evaluated up to order g^2 as a function of the unique parameter C defining the modified propagator and then C is fixed to give a current estimate of <g^2 G^2>. The light quarks u and d result to be confined and the s, c, b and t ones show damped propagation modes, then suggesting a model for the large differences in stability between the nucleons and the higher resonances. The above properties of quark modes diverge from the fully confinement result following from the similar gluon propagator previously considered by Munczek and Nemirovski. On another hand, the condensate effects on the gluon self-energy furnish a tachionic mass shell as predicted by the Fukuda analysis of gluon condensation in QCD.
|
1610.08083
|
Sara Saa
|
M.B. Gavela, K. Kanshin, P.A.N. Machado, S. Saa
|
The linear-non-linear frontier for the Goldstone Higgs
|
23 pages, 1 figure and 3 tables
| null |
10.1140/epjc/s10052-016-4541-7
|
DFPD-2016/TH/17; FERMILAB-PUB-16-471-T; FTUAM-16-39;
IFT-UAM/CSIC-16-107
|
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
The minimal $SO(5)/SO(4)$ sigma model is used as a template for the
ultraviolet completion of scenarios in which the Higgs particle is a low-energy
remnant of some high-energy dynamics, enjoying a (pseudo) Nambu-Goldstone boson
ancestry. Varying the $\sigma$ mass allows to sweep from the perturbative
regime to the customary non-linear implementations. The low-energy benchmark
effective non-linear Lagrangian for bosons and fermions is obtained,
determining as well the operator coefficients including linear corrections. At
first order in the latter, three effective bosonic operators emerge which are
independent of the explicit soft breaking assumed. The Higgs couplings to
vector bosons and fermions turn out to be quite universal: the linear
corrections are proportional to the explicit symmetry breaking parameters.
Furthermore, we define an effective Yukawa operator which allows a simple
parametrization and comparison of different heavy fermion ultraviolet
completions. In addition, one particular fermionic completion is explored in
detail, obtaining the corresponding leading low-energy fermionic operators.
|
[
{
"created": "Tue, 25 Oct 2016 20:28:19 GMT",
"version": "v1"
}
] |
2017-02-01
|
[
[
"Gavela",
"M. B.",
""
],
[
"Kanshin",
"K.",
""
],
[
"Machado",
"P. A. N.",
""
],
[
"Saa",
"S.",
""
]
] |
The minimal $SO(5)/SO(4)$ sigma model is used as a template for the ultraviolet completion of scenarios in which the Higgs particle is a low-energy remnant of some high-energy dynamics, enjoying a (pseudo) Nambu-Goldstone boson ancestry. Varying the $\sigma$ mass allows to sweep from the perturbative regime to the customary non-linear implementations. The low-energy benchmark effective non-linear Lagrangian for bosons and fermions is obtained, determining as well the operator coefficients including linear corrections. At first order in the latter, three effective bosonic operators emerge which are independent of the explicit soft breaking assumed. The Higgs couplings to vector bosons and fermions turn out to be quite universal: the linear corrections are proportional to the explicit symmetry breaking parameters. Furthermore, we define an effective Yukawa operator which allows a simple parametrization and comparison of different heavy fermion ultraviolet completions. In addition, one particular fermionic completion is explored in detail, obtaining the corresponding leading low-energy fermionic operators.
|
1609.04688
|
Carlo Giunti Dr.
|
Carlo Giunti
|
Oscillations Beyond Three-Neutrino Mixing
|
8 pages; proceedings of Neutrino 2016, XXVII International Conference
on Neutrino Physics and Astrophysics, 4-9 July 2016, London, UK
| null |
10.1088/1742-6596/888/1/012019
| null |
hep-ph astro-ph.CO hep-ex
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
The current status of the phenomenology of short-baseline neutrino
oscillations induced by light sterile neutrinos in the framework of 3+1 mixing
is reviewed.
|
[
{
"created": "Thu, 15 Sep 2016 15:05:59 GMT",
"version": "v1"
},
{
"created": "Mon, 3 Oct 2016 09:32:38 GMT",
"version": "v2"
}
] |
2017-10-11
|
[
[
"Giunti",
"Carlo",
""
]
] |
The current status of the phenomenology of short-baseline neutrino oscillations induced by light sterile neutrinos in the framework of 3+1 mixing is reviewed.
|
hep-ph/0510060
|
A. V. Luchinsky
|
V. V. Braguta, A. K. Likhoded, A. V. Luchinsky
|
Inclusive decays \chi_{b0,2}->\psi D\bar D+X and the duality relation
|
8 pages, 3 figures; minor changes
|
Phys.Rev.D73:034021,2006; Phys.Atom.Nucl.70:901-907,2007;
Yad.Fiz.70:934-940,2007
|
10.1103/PhysRevD.73.034021 10.1134/S1063778807050134
| null |
hep-ph
| null |
In this article we consider the three-particle decays $\chi_{b0,2}\to J/\psi
c\bar c\to J/\psi D\bar D+X$. We present the analytical formulae for the
differential widths of these decays, the numerical values of their integrated
widths and check the duality relation that connects the decays
$\chi_{b0,2}\to\psi c\bar c$ with the two-particle decays $\chi_{b0,2}\to
J/\psi (c\bar c)$. We also study the possibility of observing the
$\chi_{b0,2}\to J/\psi DD+X$ mode at Tevatron and LHC colliders.
|
[
{
"created": "Wed, 5 Oct 2005 15:31:27 GMT",
"version": "v1"
},
{
"created": "Sun, 25 Dec 2005 12:13:40 GMT",
"version": "v2"
}
] |
2008-11-26
|
[
[
"Braguta",
"V. V.",
""
],
[
"Likhoded",
"A. K.",
""
],
[
"Luchinsky",
"A. V.",
""
]
] |
In this article we consider the three-particle decays $\chi_{b0,2}\to J/\psi c\bar c\to J/\psi D\bar D+X$. We present the analytical formulae for the differential widths of these decays, the numerical values of their integrated widths and check the duality relation that connects the decays $\chi_{b0,2}\to\psi c\bar c$ with the two-particle decays $\chi_{b0,2}\to J/\psi (c\bar c)$. We also study the possibility of observing the $\chi_{b0,2}\to J/\psi DD+X$ mode at Tevatron and LHC colliders.
|
hep-ph/0302064
|
Johan Bijnens
|
Olof Strandberg (Lund)
|
Determination of the Anomalous Chiral Coefficients of order $p^{6}$
|
45 pages, Master thesis with advisor Johan Bijnens
| null | null |
LU TP 03-02
|
hep-ph
| null |
Symmetries affected by the anomaly do not survive quantization and cannot be
understood classically. They are of fundamental importance and offer an
opportunity of expanding the theoretical framework. We examine the theory of
the anomalous sector, starting from lowest order Chiral Perturbation Theory
(ChPT), leading up to the construction of the recently developed Lagrangian of
$\mathcal{O}(p^{6}) $ describing anomalous processes. This Lagrangian contains
a set of chiral coefficients that must be determined phenomenologically. Using
currently available experimental data, we fit as many of these coefficients as
possible. The results of the ChPT treatment are then used to test the validity
of the two main alternative models employed in the anomalous sector - Vector
Meson Dominance (VMD) and the constituent Chiral Quark Model (CQM).
|
[
{
"created": "Mon, 10 Feb 2003 12:59:19 GMT",
"version": "v1"
}
] |
2007-05-23
|
[
[
"Strandberg",
"Olof",
"",
"Lund"
]
] |
Symmetries affected by the anomaly do not survive quantization and cannot be understood classically. They are of fundamental importance and offer an opportunity of expanding the theoretical framework. We examine the theory of the anomalous sector, starting from lowest order Chiral Perturbation Theory (ChPT), leading up to the construction of the recently developed Lagrangian of $\mathcal{O}(p^{6}) $ describing anomalous processes. This Lagrangian contains a set of chiral coefficients that must be determined phenomenologically. Using currently available experimental data, we fit as many of these coefficients as possible. The results of the ChPT treatment are then used to test the validity of the two main alternative models employed in the anomalous sector - Vector Meson Dominance (VMD) and the constituent Chiral Quark Model (CQM).
|
2303.08764
|
Anders Rehult
|
Robert Fleischer, Eleftheria Malami, Anders Rehult, K. Keri Vos
|
New Perspectives for Testing Electron-Muon Universality
|
18 pages, 6 figures
| null |
10.1007/JHEP06(2023)033
|
Nikhef-2023-002, SI-HEP-2023-05, P3H-23-014
|
hep-ph hep-ex
|
http://creativecommons.org/licenses/by/4.0/
|
Intriguing results for tests of the universality of electrons and muons
through measurements of rates of $B\to K \ell^+ \ell^-$ and similar decays have
been in the spotlight for years. The LHCb collaboration has recently reported
new results which are in agreement with Lepton Flavour Universality, while the
individual decay rates are found below their Standard Model predictions. In
view of this new situation, we explore how much space is left for a violation
of electron-muon universality. Considering new sources of CP violation and
taking the new LHCb measurements into account, we show that significant
differences between the short-distance coefficients for electronic and muonic
final states are actually allowed by the current data. These patterns can be
revealed through CP asymmetries in neutral and charged $B\to K \ell^+ \ell^-$
decays. We obtain correlations between these observables and map them to the
short-distance coefficients. This results in regions in New Physics parameter
space with large differences between CP asymmetries of the decays with
final-state electrons and muons, thereby leaving a lot of room for possible
surprises in the future high-precision era.
|
[
{
"created": "Wed, 15 Mar 2023 17:02:36 GMT",
"version": "v1"
}
] |
2023-06-21
|
[
[
"Fleischer",
"Robert",
""
],
[
"Malami",
"Eleftheria",
""
],
[
"Rehult",
"Anders",
""
],
[
"Vos",
"K. Keri",
""
]
] |
Intriguing results for tests of the universality of electrons and muons through measurements of rates of $B\to K \ell^+ \ell^-$ and similar decays have been in the spotlight for years. The LHCb collaboration has recently reported new results which are in agreement with Lepton Flavour Universality, while the individual decay rates are found below their Standard Model predictions. In view of this new situation, we explore how much space is left for a violation of electron-muon universality. Considering new sources of CP violation and taking the new LHCb measurements into account, we show that significant differences between the short-distance coefficients for electronic and muonic final states are actually allowed by the current data. These patterns can be revealed through CP asymmetries in neutral and charged $B\to K \ell^+ \ell^-$ decays. We obtain correlations between these observables and map them to the short-distance coefficients. This results in regions in New Physics parameter space with large differences between CP asymmetries of the decays with final-state electrons and muons, thereby leaving a lot of room for possible surprises in the future high-precision era.
|
2005.08218
|
Jorge Segovia
|
J. Segovia, C. Albertus, D.R. Entem, F. Fern\'andez, E. Hern\'andez,
M.A. P\'erez-Garc\'ia
|
Weak B Decays into Orbitally Excited Charmed Mesons
|
Contribution to the proceedings of the XIV International Conference
on Hadron Spectroscopy (HADRON 2011); 13-17 June 2011, Munich, Germany
|
eConf C110613:622 (2011)
| null | null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
The BaBar Collaboration has recently reported branching fractions for
semileptonic decays of the $B$ meson into final states with charged and neutral
$D_{1}(2420)$ and $D_{2}^{\ast}(2460)$, two narrow orbitally excited charmed
mesons. We evaluate these branching fractions within the framework of a
constituent quark model in two steps, one which involves a semileptonic decay
and the other one mediated by a strong process. Our results are in agreement
with the experimental data.
|
[
{
"created": "Sun, 17 May 2020 11:00:37 GMT",
"version": "v1"
}
] |
2020-05-19
|
[
[
"Segovia",
"J.",
""
],
[
"Albertus",
"C.",
""
],
[
"Entem",
"D. R.",
""
],
[
"Fernández",
"F.",
""
],
[
"Hernández",
"E.",
""
],
[
"Pérez-García",
"M. A.",
""
]
] |
The BaBar Collaboration has recently reported branching fractions for semileptonic decays of the $B$ meson into final states with charged and neutral $D_{1}(2420)$ and $D_{2}^{\ast}(2460)$, two narrow orbitally excited charmed mesons. We evaluate these branching fractions within the framework of a constituent quark model in two steps, one which involves a semileptonic decay and the other one mediated by a strong process. Our results are in agreement with the experimental data.
|
hep-ph/0501112
|
Loiseau Benoit
|
B. Loiseau, S. Wycech
|
Antiproton-Proton Channels in J/psi Decays
|
6 pages, 5 figures. The antiproton-proton pair being in isospin one
in the J/Psi decay into neutral pion-antiproton-proton, the antiproton-proton
1P1 and 3S1 waves have been replaced by the 31P1 and 33S1 ones and Figs. 1
and 2 have been replaced accordingly. Conclusions are unchanged. Most of the
content of the paper is published in Phys. Rev. C72, 011001 (2005)
|
Phys.Rev.C72:011001,2005
|
10.1103/PhysRevC.72.011001
|
LPNHE 2005-01
|
hep-ph
| null |
The recent measurements by the BES Collaboration of J/psi decays into a
photon and a proton-antiproton pair indicate a strong enhancement at the
proton-antiproton threshold not observed in the decays into a neutral pion and
a proton-antiproton pair. Is this enhancement due to a proton-antiproton
quasi-bound state or a baryonium? A natural explanation follows from a
traditional model of proton-antiproton interactions based on G-parity
transformation. The observed proton-antiproton structure is due to a strong
attraction in the 1S0 state, and possibly to a near-threshold quasi-bound state
in the 11S0 wave.
|
[
{
"created": "Thu, 13 Jan 2005 19:13:34 GMT",
"version": "v1"
},
{
"created": "Fri, 16 Dec 2005 09:34:21 GMT",
"version": "v2"
}
] |
2008-11-26
|
[
[
"Loiseau",
"B.",
""
],
[
"Wycech",
"S.",
""
]
] |
The recent measurements by the BES Collaboration of J/psi decays into a photon and a proton-antiproton pair indicate a strong enhancement at the proton-antiproton threshold not observed in the decays into a neutral pion and a proton-antiproton pair. Is this enhancement due to a proton-antiproton quasi-bound state or a baryonium? A natural explanation follows from a traditional model of proton-antiproton interactions based on G-parity transformation. The observed proton-antiproton structure is due to a strong attraction in the 1S0 state, and possibly to a near-threshold quasi-bound state in the 11S0 wave.
|
hep-ph/0512099
|
Matthias Steinhauser
|
D. Eiras, M. Steinhauser
|
Two-Loop ${\cal O}(\alpha\alpha_s)$ Corrections to the On-Shell Fermion
Propagator in the Standard Model
|
34 pages
|
JHEP 0602:010,2006
|
10.1088/1126-6708/2006/02/010
|
SFB/CPP-05-78, TTP05-26
|
hep-ph
| null |
In this paper we consider mixed two-loop electroweak corrections to the top
quark propagator in the Standard Model. In particular, we compute the on-shell
renormalization constant for the mass and wave function, which constitute
building blocks for many physical processes. The results are expressed in terms
of master integrals. For the latter practical approximations are derived. In
the case of the mass renormalization constant we find agreement with the
results in the literature.
|
[
{
"created": "Thu, 8 Dec 2005 12:05:38 GMT",
"version": "v1"
}
] |
2011-01-13
|
[
[
"Eiras",
"D.",
""
],
[
"Steinhauser",
"M.",
""
]
] |
In this paper we consider mixed two-loop electroweak corrections to the top quark propagator in the Standard Model. In particular, we compute the on-shell renormalization constant for the mass and wave function, which constitute building blocks for many physical processes. The results are expressed in terms of master integrals. For the latter practical approximations are derived. In the case of the mass renormalization constant we find agreement with the results in the literature.
|
1406.7652
|
Christian Reuschle
|
Christian Reuschle, Stefan Weinzierl
|
Color decomposition of multi-quark one-loop QCD amplitudes
|
10 pages. Talk given at Loops and Legs 2014
| null | null | null |
hep-ph hep-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
In this talk we discuss the color decomposition of tree-level and one-loop
QCD amplitudes with arbitrary numbers of quarks and gluons. We present a method
for the decomposition of partial amplitudes into primitive amplitudes, which is
based on shuffle relations and is purely combinatorial. Closed formulae are
derived, which do not require the inversion of a system of linear equations.
|
[
{
"created": "Mon, 30 Jun 2014 10:13:00 GMT",
"version": "v1"
},
{
"created": "Wed, 2 Jul 2014 16:04:48 GMT",
"version": "v2"
}
] |
2014-07-03
|
[
[
"Reuschle",
"Christian",
""
],
[
"Weinzierl",
"Stefan",
""
]
] |
In this talk we discuss the color decomposition of tree-level and one-loop QCD amplitudes with arbitrary numbers of quarks and gluons. We present a method for the decomposition of partial amplitudes into primitive amplitudes, which is based on shuffle relations and is purely combinatorial. Closed formulae are derived, which do not require the inversion of a system of linear equations.
|
1510.08218
|
Renata Jora
|
Amir H. Fariborz, Renata Jora
|
Note on the standard model as an effective theory
|
8 pages
| null | null | null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We present a criterion of consistency derived from the analogy between the
partition function of a quantum field theory and that of a statistical system.
Based on this we examine a new class of higher dimension operators that might
act in the standard model.
|
[
{
"created": "Wed, 28 Oct 2015 08:00:01 GMT",
"version": "v1"
}
] |
2015-10-29
|
[
[
"Fariborz",
"Amir H.",
""
],
[
"Jora",
"Renata",
""
]
] |
We present a criterion of consistency derived from the analogy between the partition function of a quantum field theory and that of a statistical system. Based on this we examine a new class of higher dimension operators that might act in the standard model.
|
1503.06783
|
Mitsuru Kakizaki
|
Mitsuru Kakizaki, Eun-Kyung Park, Jae-hyeon Park and Akiteru Santa
|
Phenomenological constraints on light mixed sneutrino dark matter
scenarios
|
14 pages, 1 figure
| null |
10.1016/j.physletb.2015.07.030
|
UT-HET-094, EPHOU-15-008, FTUV-15-8555, IFIC-15-15
|
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
In supersymmetric models with Dirac neutrinos, the lightest sneutrino can be
an excellent thermal dark matter candidate when the soft sneutrino trilinear
parameter is large. We focus on scenarios where the mass of the mixed sneutrino
is of the order of GeV and sensitivity of dark matter direct detection is weak.
We investigate phenomenological constraints on the model parameter space
including the vacuum stability bound. We show that the allowed regions can be
explored by measuring Higgs boson properties at future collider experiments.
|
[
{
"created": "Mon, 23 Mar 2015 19:52:33 GMT",
"version": "v1"
},
{
"created": "Fri, 11 Mar 2022 07:30:59 GMT",
"version": "v2"
}
] |
2022-03-14
|
[
[
"Kakizaki",
"Mitsuru",
""
],
[
"Park",
"Eun-Kyung",
""
],
[
"Park",
"Jae-hyeon",
""
],
[
"Santa",
"Akiteru",
""
]
] |
In supersymmetric models with Dirac neutrinos, the lightest sneutrino can be an excellent thermal dark matter candidate when the soft sneutrino trilinear parameter is large. We focus on scenarios where the mass of the mixed sneutrino is of the order of GeV and sensitivity of dark matter direct detection is weak. We investigate phenomenological constraints on the model parameter space including the vacuum stability bound. We show that the allowed regions can be explored by measuring Higgs boson properties at future collider experiments.
|
hep-ph/9511209
|
ChengXing Zhai
|
Lowell Brown and Chengxing Zhai
|
Atomic effects in tritium beta decay
|
81 pages, 15 Postscript figures, uses a non-standard style file
"table.sty" which is appended at the end of the latex file
|
Annals Phys. 249 (1996) 298-361
|
10.1006/aphy.1996.0072
|
UW/PT-95-16, PURD-TH-95-11
|
hep-ph nucl-th
| null |
The electron neutrino mass has been measured in several tritium beta decay
experiments. These experiments are sensitive to a small neutrino mass because
the energy release of the decay is small. But the very smallness of the energy
release implies that the Coulomb interactions of the slowly moving emitted beta
electron are relatively large. Using field theoretic techniques, we derive a
systematic and controlled expansion which accounts for the Coulomb effects,
including the mutual interaction of the beta ray electron and the electron in
the final $^3{\rm He}^+$ ion. In our formulation, an effective potential which
describes the long range Coulomb force experienced by the beta ray is
introduced to ensure that our expansion is free of infrared divergences. Both
the exclusive differential decay rate to a specific final $^3{\rm He}^+$ state
and the inclusive differential decay rate are calculated to order $\eta^2$,
where $\eta$ is the usual Coulomb parameter. We analyze the order $\eta^2$
correction to the beta ray spectrum and estimate how it may affect the neutrino
mass squared parameter and the endpoint energy when this corrected spectrum is
used to compare with the experiments. We find that the effect is small.
|
[
{
"created": "Thu, 2 Nov 1995 06:37:51 GMT",
"version": "v1"
}
] |
2009-10-28
|
[
[
"Brown",
"Lowell",
""
],
[
"Zhai",
"Chengxing",
""
]
] |
The electron neutrino mass has been measured in several tritium beta decay experiments. These experiments are sensitive to a small neutrino mass because the energy release of the decay is small. But the very smallness of the energy release implies that the Coulomb interactions of the slowly moving emitted beta electron are relatively large. Using field theoretic techniques, we derive a systematic and controlled expansion which accounts for the Coulomb effects, including the mutual interaction of the beta ray electron and the electron in the final $^3{\rm He}^+$ ion. In our formulation, an effective potential which describes the long range Coulomb force experienced by the beta ray is introduced to ensure that our expansion is free of infrared divergences. Both the exclusive differential decay rate to a specific final $^3{\rm He}^+$ state and the inclusive differential decay rate are calculated to order $\eta^2$, where $\eta$ is the usual Coulomb parameter. We analyze the order $\eta^2$ correction to the beta ray spectrum and estimate how it may affect the neutrino mass squared parameter and the endpoint energy when this corrected spectrum is used to compare with the experiments. We find that the effect is small.
|
hep-ph/9809417
|
Vittorio Lubicz
|
Vittorio Lubicz
|
Light quark masses and CKM matrix elements from lattice QCD
|
5 pages, 4 figures, uses espcrc2.sty (included). Based on invited
talk given at the QCD 98 Euroconference, Montpellier, France, 2-8 July 1998
|
Nucl.Phys.Proc.Suppl. 74 (1999) 291-295
|
10.1016/S0920-5632(99)00180-2
| null |
hep-ph hep-lat
| null |
I give a brief overview of recent results from lattice QCD calculations which
are relevant for the phenomenology of the Standard Model. I discuss, in
particular, the lattice determination of light quark masses and the calculation
of those hadronic quantities, such as semileptonic form factors, decay
constants and B-parameters, which are of particular interest for the analysis
of the CKM mixing matrix and the origin of CP violation.
|
[
{
"created": "Wed, 16 Sep 1998 16:23:51 GMT",
"version": "v1"
}
] |
2009-10-31
|
[
[
"Lubicz",
"Vittorio",
""
]
] |
I give a brief overview of recent results from lattice QCD calculations which are relevant for the phenomenology of the Standard Model. I discuss, in particular, the lattice determination of light quark masses and the calculation of those hadronic quantities, such as semileptonic form factors, decay constants and B-parameters, which are of particular interest for the analysis of the CKM mixing matrix and the origin of CP violation.
|
hep-ph/9802211
|
Frank Klingl
|
F. Klingl and W. Weise
|
Vector mesons in medium
|
13 pages in Latex, talk given at the XXXVI International Winter
Meeting on Nuclear Physics
| null | null | null |
hep-ph nucl-th
| null |
Based on an effective Lagrangian which combines chiral SU(3) dynamics with
vector meson dominance, we have developed a model for the forward vector
meson-nucleon scattering amplitudes. We use this as an input to calculate the
low energy part of the current-current correlation function in nuclear matter.
For the isovector channel we find a significant enhancement of the in-medium
spectral density below the $\rho$ resonance while the $\rho$ meson mass itself
changes only slightly. The situation is different in the isoscalar channel,
where the mass and peak position of the $\omega$ meson move downward while its
width increases moderately. For the $\phi$ meson we find almost no mass shift,
but the width of the peak increases significantly. We use these spectra as
``left hand side'' of in medium QCD sum rules and observe a remarkable degree
of consistency with the operator product expansion ``right hand''side in all
three channels. We point out, however, that these results cannot simply be
interpreted, as commonly done, in terms of a universal rescaling of vector
meson masses in matter. We also compare the resulting thermal dilepton rates of
our model with CERES data. We find satisfactory agreement but we point out that
the dilepton rates from completely uncorrelated quark-antiquark pairs also fit
the data quite well. Considering the strongly attractive potential for the
$\omega$ together with its comparably small width, we discuss the possible
formation of bound $\omega$ states in nuclei. Using a Green's function approach
we investigate the possibility of detecting these bound states in the $A(d,
^3He) $ pick-up reaction.
|
[
{
"created": "Mon, 2 Feb 1998 17:07:11 GMT",
"version": "v1"
}
] |
2007-05-23
|
[
[
"Klingl",
"F.",
""
],
[
"Weise",
"W.",
""
]
] |
Based on an effective Lagrangian which combines chiral SU(3) dynamics with vector meson dominance, we have developed a model for the forward vector meson-nucleon scattering amplitudes. We use this as an input to calculate the low energy part of the current-current correlation function in nuclear matter. For the isovector channel we find a significant enhancement of the in-medium spectral density below the $\rho$ resonance while the $\rho$ meson mass itself changes only slightly. The situation is different in the isoscalar channel, where the mass and peak position of the $\omega$ meson move downward while its width increases moderately. For the $\phi$ meson we find almost no mass shift, but the width of the peak increases significantly. We use these spectra as ``left hand side'' of in medium QCD sum rules and observe a remarkable degree of consistency with the operator product expansion ``right hand''side in all three channels. We point out, however, that these results cannot simply be interpreted, as commonly done, in terms of a universal rescaling of vector meson masses in matter. We also compare the resulting thermal dilepton rates of our model with CERES data. We find satisfactory agreement but we point out that the dilepton rates from completely uncorrelated quark-antiquark pairs also fit the data quite well. Considering the strongly attractive potential for the $\omega$ together with its comparably small width, we discuss the possible formation of bound $\omega$ states in nuclei. Using a Green's function approach we investigate the possibility of detecting these bound states in the $A(d, ^3He) $ pick-up reaction.
|
0910.0203
|
Joao Pulido
|
Joao Pulido, C R Das, Marco Picariello
|
Remaining inconsistencies with solar neutrinos: can spin flavour
precession provide a clue?
|
3 pages, 2 figures, contribution to TAUP 2009 (Rome)
|
J.Phys.Conf.Ser.203:012086,2010
|
10.1088/1742-6596/203/1/012086
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
A few inconsistencies remain after it has been ascertained that LMA is the
dominant solution to the solar neutrino problem: why is the SuperKamiokande
spectrum flat and why is the Chlorine rate prediction over two standard
deviations above the data. There also remains the ananswered and important
question of whether the active neutrino flux is constant or time varying. We
propose a scenario involving spin flavour precession to sterile neutrinos with
three active flavours that predicts a flat SuperK spectrum and a Chlorine rate
prediction more consistent with data. We also argue that running the Borexino
experiment during the next few years may provide a very important clue as to
the possible variability of the solar neutrino flux.
|
[
{
"created": "Thu, 1 Oct 2009 15:33:27 GMT",
"version": "v1"
}
] |
2010-02-11
|
[
[
"Pulido",
"Joao",
""
],
[
"Das",
"C R",
""
],
[
"Picariello",
"Marco",
""
]
] |
A few inconsistencies remain after it has been ascertained that LMA is the dominant solution to the solar neutrino problem: why is the SuperKamiokande spectrum flat and why is the Chlorine rate prediction over two standard deviations above the data. There also remains the ananswered and important question of whether the active neutrino flux is constant or time varying. We propose a scenario involving spin flavour precession to sterile neutrinos with three active flavours that predicts a flat SuperK spectrum and a Chlorine rate prediction more consistent with data. We also argue that running the Borexino experiment during the next few years may provide a very important clue as to the possible variability of the solar neutrino flux.
|
2111.13099
|
Katsuya Hashino
|
Katsuya Hashino, Shinya Kanemura and Tomo Takahashi
|
Primordial black holes as a probe of strongly first-order electroweak
phase transition
|
14 pages, 2 figures. Version accepted by Physics Letters B
| null |
10.1016/j.physletb.2022.137261
|
OU-HET-1123
|
hep-ph astro-ph.CO
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Primordial black holes can be produced by density fluctuations generated from
delayed vacuum decays of first-order phase transition. The primordial black
holes generated at the electroweak phase transition have masses of about
$10^{-5}$ solar mass. Such primordial black holes in the mass range can be
tested by current and future microlensing observations, such as Subaru HSC,
OGLE, PRIME and Roman telescope. Therefore, we may be able to explore new
physics models with strongly first-order electroweak phase transition via
primordial black holes. We examine this possibility by using models with
first-order electroweak phase transition in the standard model effective field
theory with dimension 6 and 8 operators. We find that depending on parameters
of the phase transition a sufficient number of primordial black holes can be
produced to be observed by above mentioned experiments. Our results would
suggest that primordial black holes can be used as a new probe of models with
strongly first-order electroweak phase transition, which has complementarity
with measurements of the triple Higgs boson coupling at future collider
experiments and observations of gravitational waves at future space-based
interferometers.
|
[
{
"created": "Thu, 25 Nov 2021 14:27:21 GMT",
"version": "v1"
},
{
"created": "Wed, 22 Jun 2022 07:03:03 GMT",
"version": "v2"
}
] |
2022-07-27
|
[
[
"Hashino",
"Katsuya",
""
],
[
"Kanemura",
"Shinya",
""
],
[
"Takahashi",
"Tomo",
""
]
] |
Primordial black holes can be produced by density fluctuations generated from delayed vacuum decays of first-order phase transition. The primordial black holes generated at the electroweak phase transition have masses of about $10^{-5}$ solar mass. Such primordial black holes in the mass range can be tested by current and future microlensing observations, such as Subaru HSC, OGLE, PRIME and Roman telescope. Therefore, we may be able to explore new physics models with strongly first-order electroweak phase transition via primordial black holes. We examine this possibility by using models with first-order electroweak phase transition in the standard model effective field theory with dimension 6 and 8 operators. We find that depending on parameters of the phase transition a sufficient number of primordial black holes can be produced to be observed by above mentioned experiments. Our results would suggest that primordial black holes can be used as a new probe of models with strongly first-order electroweak phase transition, which has complementarity with measurements of the triple Higgs boson coupling at future collider experiments and observations of gravitational waves at future space-based interferometers.
|
2309.09581
|
Tanjona Radonirina Rabemananjara
|
Juan M. Cruz-Martinez, Max Fieg, Tommaso Giani, Peter Krack, Toni
M\"akel\"a, Tanjona Rabemananjara, Juan Rojo
|
The LHC as a Neutrino-Ion Collider
|
42 pages, 22 figures. Added detailed studies on fluxes uncertainties
| null | null |
Nikhef-2023-009, CERN-TH-2023-165
|
hep-ph hep-ex nucl-ex nucl-th
|
http://creativecommons.org/licenses/by/4.0/
|
Proton-proton collisions at the LHC generate a high-intensity collimated beam
of neutrinos in the forward (beam) direction, characterised by energies of up
to several TeV. The recent observation of LHC neutrinos by FASER$\nu$ and
SND@LHC signals that this hitherto ignored particle beam is now available for
scientific inquiry. Here we quantify the impact that neutrino deep-inelastic
scattering (DIS) measurements at the LHC would have on the parton distributions
(PDFs) of protons and heavy nuclei. We generate projections for DIS structure
functions for FASER$\nu$ and SND@LHC at Run III, as well as for the
FASER$\nu$2, AdvSND, and FLArE experiments to be hosted at the proposed Forward
Physics Facility (FPF) operating concurrently with the High-Luminosity LHC
(HL-LHC). We determine that up to one million electron- and muon-neutrino DIS
interactions within detector acceptance can be expected by the end of the
HL-LHC, covering a kinematic region in $x$ and $Q^2$ overlapping with that of
the Electron-Ion Collider. Including these DIS projections into global (n)PDF
analyses, specifically PDF4LHC21, NNPDF4.0, and EPPS21, reveals a significant
reduction of PDF uncertainties, in particular for strangeness and the up and
down valence PDFs. We show that LHC neutrino data enables improved theoretical
predictions for core processes at the HL-LHC, such as Higgs and weak gauge
boson production. Our analysis demonstrates that exploiting the LHC neutrino
beam effectively provides CERN with a "Neutrino-Ion Collider" without requiring
modifications in its accelerator infrastructure.
|
[
{
"created": "Mon, 18 Sep 2023 08:43:13 GMT",
"version": "v1"
},
{
"created": "Mon, 1 Apr 2024 17:45:56 GMT",
"version": "v2"
}
] |
2024-04-02
|
[
[
"Cruz-Martinez",
"Juan M.",
""
],
[
"Fieg",
"Max",
""
],
[
"Giani",
"Tommaso",
""
],
[
"Krack",
"Peter",
""
],
[
"Mäkelä",
"Toni",
""
],
[
"Rabemananjara",
"Tanjona",
""
],
[
"Rojo",
"Juan",
""
]
] |
Proton-proton collisions at the LHC generate a high-intensity collimated beam of neutrinos in the forward (beam) direction, characterised by energies of up to several TeV. The recent observation of LHC neutrinos by FASER$\nu$ and SND@LHC signals that this hitherto ignored particle beam is now available for scientific inquiry. Here we quantify the impact that neutrino deep-inelastic scattering (DIS) measurements at the LHC would have on the parton distributions (PDFs) of protons and heavy nuclei. We generate projections for DIS structure functions for FASER$\nu$ and SND@LHC at Run III, as well as for the FASER$\nu$2, AdvSND, and FLArE experiments to be hosted at the proposed Forward Physics Facility (FPF) operating concurrently with the High-Luminosity LHC (HL-LHC). We determine that up to one million electron- and muon-neutrino DIS interactions within detector acceptance can be expected by the end of the HL-LHC, covering a kinematic region in $x$ and $Q^2$ overlapping with that of the Electron-Ion Collider. Including these DIS projections into global (n)PDF analyses, specifically PDF4LHC21, NNPDF4.0, and EPPS21, reveals a significant reduction of PDF uncertainties, in particular for strangeness and the up and down valence PDFs. We show that LHC neutrino data enables improved theoretical predictions for core processes at the HL-LHC, such as Higgs and weak gauge boson production. Our analysis demonstrates that exploiting the LHC neutrino beam effectively provides CERN with a "Neutrino-Ion Collider" without requiring modifications in its accelerator infrastructure.
|
2105.03063
|
Muyang Chen
|
Muyang Chen
|
Scalar Mesons and Axial-vector Mesons Via Dyson-Schwinger Equation and
Bethe-Salpeter Equation Approach
|
5 pages, 1 figure
| null | null | null |
hep-ph nucl-th
|
http://creativecommons.org/licenses/by/4.0/
|
In this work, I studied the spectrum of scalar mesons and axial-vector mesons
via Dyson-Schwinger equation and Bethe-Salpeter equation approach in the
rainbow-ladder approximation. An interaction model with a repulsive term added
to the one used for the pseudoscalar and vector mesons is proposed. My results
are consistent with the experiment data and other model results, which shows
that this interaction model is effective for all the heavy, heavy-light, and
light scalar and axial-vector mesons.
|
[
{
"created": "Fri, 7 May 2021 04:25:20 GMT",
"version": "v1"
},
{
"created": "Sat, 17 Jul 2021 23:21:39 GMT",
"version": "v2"
}
] |
2021-07-20
|
[
[
"Chen",
"Muyang",
""
]
] |
In this work, I studied the spectrum of scalar mesons and axial-vector mesons via Dyson-Schwinger equation and Bethe-Salpeter equation approach in the rainbow-ladder approximation. An interaction model with a repulsive term added to the one used for the pseudoscalar and vector mesons is proposed. My results are consistent with the experiment data and other model results, which shows that this interaction model is effective for all the heavy, heavy-light, and light scalar and axial-vector mesons.
|
1502.03959
|
Motoi Endo
|
Motoi Endo, Takeo Moroi, Mihoko M. Nojiri
|
Footprints of Supersymmetry on Higgs Decay
|
24 pages, 8 figures, version accepted in JHEP
| null |
10.1007/JHEP04(2015)176
|
UT-15-02, IPMU-15-0018, KEK-TH-1795
|
hep-ph hep-ex
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Motivated by future collider proposals that aim to measure the Higgs
properties precisely, we study the partial decay widths of the lightest Higgs
boson in the minimal supersymmetric standard model with an emphasis on the
parameter region where all superparticles and heavy Higgs bosons are not
accessible at the LHC. Taking account of phenomenological constraints such as
the Higgs mass, flavor constraints, vacuum stability, and perturbativity of
coupling constants up to the grand unification scale, we discuss how large the
deviations of the partial decay widths from the standard model predictions can
be. These constraints exclude large fraction of the parameter region where the
Higgs widths show significant deviation from the standard model predictions.
Nevertheless, even if superparticles and the heavy Higgses are out of the reach
of 14TeV LHC, the deviation may be large enough to be observed at future
$e^+e^-$ collider experiments.
|
[
{
"created": "Fri, 13 Feb 2015 12:19:35 GMT",
"version": "v1"
},
{
"created": "Thu, 30 Apr 2015 02:09:23 GMT",
"version": "v2"
}
] |
2015-06-11
|
[
[
"Endo",
"Motoi",
""
],
[
"Moroi",
"Takeo",
""
],
[
"Nojiri",
"Mihoko M.",
""
]
] |
Motivated by future collider proposals that aim to measure the Higgs properties precisely, we study the partial decay widths of the lightest Higgs boson in the minimal supersymmetric standard model with an emphasis on the parameter region where all superparticles and heavy Higgs bosons are not accessible at the LHC. Taking account of phenomenological constraints such as the Higgs mass, flavor constraints, vacuum stability, and perturbativity of coupling constants up to the grand unification scale, we discuss how large the deviations of the partial decay widths from the standard model predictions can be. These constraints exclude large fraction of the parameter region where the Higgs widths show significant deviation from the standard model predictions. Nevertheless, even if superparticles and the heavy Higgses are out of the reach of 14TeV LHC, the deviation may be large enough to be observed at future $e^+e^-$ collider experiments.
|
1611.07980
|
Emanuele Roberto Nocera
|
Emanuele R. Nocera and Elena Santopinto
|
Can sea quark asymmetry shed light on the orbital angular momentum of
the proton?
|
7 pages, 3 figures, 3 tables
| null | null |
OUTP-16-25P
|
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
A striking prediction of several extensions of the constituent quark model,
including the unquenched quark model, the pion cloud model and the chiral quark
model, is a proportionality relationship between the quark sea asymmetry and
the orbital angular momentum of the proton. We investigate to which extent a
relationship of this kind is corroborated by the experiment, through a
systematic comparison between expectations based on models and predictions
obtained from a global analysis of hard-scattering data in perturbative Quantum
Chromodynamics. We find that the data allows the angular momentum of the proton
to be proportional to its sea asymmetry, though with a rather large range of
the optimal values of the proportionality coefficient. Typical values do not
enable us to discriminate among expectations based on different models. In
order to make our comparison conclusive, the extrapolation uncertainties on the
proportionality coefficient should be reduced, hopefully by means of accurate
measurements in the region of small proton momentum fractions, where the data
is currently lacking. Nevertheless, the unquenched quark model predicts that
quarks account for a proton spin fraction much larger than that accepted by the
conventional wisdom. We explicitly demonstrate that such a discrepancy can be
reabsorbed in the unknown extrapolation region, without affecting the
description of current data, by imposing the unquenched quark model expectation
as a boundary condition in the analysis of the data itself. We delineate how
the experimental programs at current and future facilities may shed light on
the region of small momentum fractions.
|
[
{
"created": "Wed, 23 Nov 2016 21:00:02 GMT",
"version": "v1"
}
] |
2016-11-28
|
[
[
"Nocera",
"Emanuele R.",
""
],
[
"Santopinto",
"Elena",
""
]
] |
A striking prediction of several extensions of the constituent quark model, including the unquenched quark model, the pion cloud model and the chiral quark model, is a proportionality relationship between the quark sea asymmetry and the orbital angular momentum of the proton. We investigate to which extent a relationship of this kind is corroborated by the experiment, through a systematic comparison between expectations based on models and predictions obtained from a global analysis of hard-scattering data in perturbative Quantum Chromodynamics. We find that the data allows the angular momentum of the proton to be proportional to its sea asymmetry, though with a rather large range of the optimal values of the proportionality coefficient. Typical values do not enable us to discriminate among expectations based on different models. In order to make our comparison conclusive, the extrapolation uncertainties on the proportionality coefficient should be reduced, hopefully by means of accurate measurements in the region of small proton momentum fractions, where the data is currently lacking. Nevertheless, the unquenched quark model predicts that quarks account for a proton spin fraction much larger than that accepted by the conventional wisdom. We explicitly demonstrate that such a discrepancy can be reabsorbed in the unknown extrapolation region, without affecting the description of current data, by imposing the unquenched quark model expectation as a boundary condition in the analysis of the data itself. We delineate how the experimental programs at current and future facilities may shed light on the region of small momentum fractions.
|
1905.06965
|
Abhishek Mohapatra
|
Thomas Mehen and Abhishek Mohapatra
|
Perturbative Corrections to Heavy Quark-Diquark Symmetry Predictions for
Doubly Heavy Baryon Hyperfine Splittings
|
15 pages, 6 figures, Added Section III and updated references and
author name. Journal version
|
Phys. Rev. D 100, 076014 (2019)
|
10.1103/PhysRevD.100.076014
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Doubly heavy baryons $\left(QQq\right)$ and singly heavy antimesons
$\left(\bar{Q}q\right)$ are related by the heavy quark-diquark (HQDQ) symmetry
because in the $m_Q \to \infty$ limit, the light degrees of freedom in both the
hadrons are expected to be in identical configurations. Hyperfine splittings of
the ground states in both systems are nonvanishing at $O(1/m_Q)$ in the heavy
quark mass expansion and HQDQ symmetry relates the hyperfine splittings in the
two sectors. In this paper, working within the framework of Non-Relativistic
QCD (NRQCD), we point out the existence of an operator that couples four heavy
quark fields to the chromomagnetic field with a coefficient that is enhanced by
a factor from Coulomb exchange. This operator gives a correction to doubly
heavy baryon hyperfine splittings that scales as $1/m_Q^2 \times \alpha_S/r$,
where $r$ is the separation between the heavy quarks in the diquark. This
correction can be calculated analytically in the extreme heavy quark limit in
which the potential between the quarks in the diquark is Coulombic. In this
limit, the correction is $O(\alpha_s^2/m_Q)$ and comes with a small
coefficient. For values of $\alpha_s$ relevant to doubly charm and doubly
bottom systems, the correction to the hyperfine splittings in doubly heavy
baryons is only a few percent or smaller. We also argue that nonperturbative
corrections to the prediction for the hyperfine splittings are suppressed by
$\Lambda^2_{\rm QCD}/m_Q^2$ rather than $\Lambda_{\rm QCD}/m_Q$. Corrections
should be $\approx 10\%$ in the charm sector and smaller in heavier systems.
|
[
{
"created": "Thu, 16 May 2019 18:00:13 GMT",
"version": "v1"
},
{
"created": "Wed, 29 May 2019 21:34:50 GMT",
"version": "v2"
},
{
"created": "Mon, 21 Oct 2019 15:48:14 GMT",
"version": "v3"
}
] |
2019-10-22
|
[
[
"Mehen",
"Thomas",
""
],
[
"Mohapatra",
"Abhishek",
""
]
] |
Doubly heavy baryons $\left(QQq\right)$ and singly heavy antimesons $\left(\bar{Q}q\right)$ are related by the heavy quark-diquark (HQDQ) symmetry because in the $m_Q \to \infty$ limit, the light degrees of freedom in both the hadrons are expected to be in identical configurations. Hyperfine splittings of the ground states in both systems are nonvanishing at $O(1/m_Q)$ in the heavy quark mass expansion and HQDQ symmetry relates the hyperfine splittings in the two sectors. In this paper, working within the framework of Non-Relativistic QCD (NRQCD), we point out the existence of an operator that couples four heavy quark fields to the chromomagnetic field with a coefficient that is enhanced by a factor from Coulomb exchange. This operator gives a correction to doubly heavy baryon hyperfine splittings that scales as $1/m_Q^2 \times \alpha_S/r$, where $r$ is the separation between the heavy quarks in the diquark. This correction can be calculated analytically in the extreme heavy quark limit in which the potential between the quarks in the diquark is Coulombic. In this limit, the correction is $O(\alpha_s^2/m_Q)$ and comes with a small coefficient. For values of $\alpha_s$ relevant to doubly charm and doubly bottom systems, the correction to the hyperfine splittings in doubly heavy baryons is only a few percent or smaller. We also argue that nonperturbative corrections to the prediction for the hyperfine splittings are suppressed by $\Lambda^2_{\rm QCD}/m_Q^2$ rather than $\Lambda_{\rm QCD}/m_Q$. Corrections should be $\approx 10\%$ in the charm sector and smaller in heavier systems.
|
1709.05082
|
Yueling Yang
|
Yueling Yang, Junfeng Sun, Jinshu Huang, Haiyan Li, Gongru Lu, Qin
Chang
|
${\Upsilon}(nS)$ ${\to}$ $B_{c}^{\ast}D$ decays with perturbative QCD
approach
|
18 pages, 3 figures, revtex
|
Int J Mod Phys A 31, 1650146 (2016)
|
10.1142/S0217751X16501463
| null |
hep-ph hep-ex
|
http://creativecommons.org/licenses/by/4.0/
|
The ${\Upsilon}(nS)$ ${\to}$ $B_{c}^{\ast}D$ weak decays ($n$ $=$ $1$, $2$,
$3$) are investigated with perturbative QCD approach. It is found that the
CKM-favored ${\Upsilon}(nS)$ ${\to}$ $B_{c}^{\ast}D_{s}$ decays have branching
ratio of ${\cal O}(10^{-10})$, which might be potentially accessible to the
future LHC and SuperKEKB experiments.
|
[
{
"created": "Fri, 15 Sep 2017 07:25:56 GMT",
"version": "v1"
}
] |
2017-09-19
|
[
[
"Yang",
"Yueling",
""
],
[
"Sun",
"Junfeng",
""
],
[
"Huang",
"Jinshu",
""
],
[
"Li",
"Haiyan",
""
],
[
"Lu",
"Gongru",
""
],
[
"Chang",
"Qin",
""
]
] |
The ${\Upsilon}(nS)$ ${\to}$ $B_{c}^{\ast}D$ weak decays ($n$ $=$ $1$, $2$, $3$) are investigated with perturbative QCD approach. It is found that the CKM-favored ${\Upsilon}(nS)$ ${\to}$ $B_{c}^{\ast}D_{s}$ decays have branching ratio of ${\cal O}(10^{-10})$, which might be potentially accessible to the future LHC and SuperKEKB experiments.
|
1306.1631
|
Prashant Srivastava Kumar
|
P. K. Srivastava, S. K. Tiwari, C. P. Singh
|
Upsilon suppression at energies available at the BNL Relativistic Heavy
Ion Collider and at the CERN Large Hadron Collider in a modified color
screening scenario
|
7 pages, 7 figures, Revised version accepted for publication in
Physical Review C. arXiv admin note: substantial text overlap with
arXiv:1208.4796
|
Phys. Rev. C 88, 044902 (2013)
|
10.1103/PhysRevC.88.044902
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
The suppression of heavy quarkonia e.g. $J/\psi$, $\Upsilon$ etc. is
considered as a suitable probe to identify the nature of the matter created in
heavy ion collisions. Recently we have presented a modified colour screening
model for $J/\psi$ suppression in the quark gluon plasma (QGP) using
quasiparticle model as the equation of state. In this paper, we extend our
model to calculate the anomalous suppression of various states of $\Upsilon$
arising due to QGP medium alone. We obtain the suppression patterns of
different bottomonia states with respect to centrality at various available
collision energies and compare them with the available experimental data.
|
[
{
"created": "Fri, 7 Jun 2013 06:47:49 GMT",
"version": "v1"
},
{
"created": "Thu, 19 Sep 2013 05:04:27 GMT",
"version": "v2"
}
] |
2013-10-04
|
[
[
"Srivastava",
"P. K.",
""
],
[
"Tiwari",
"S. K.",
""
],
[
"Singh",
"C. P.",
""
]
] |
The suppression of heavy quarkonia e.g. $J/\psi$, $\Upsilon$ etc. is considered as a suitable probe to identify the nature of the matter created in heavy ion collisions. Recently we have presented a modified colour screening model for $J/\psi$ suppression in the quark gluon plasma (QGP) using quasiparticle model as the equation of state. In this paper, we extend our model to calculate the anomalous suppression of various states of $\Upsilon$ arising due to QGP medium alone. We obtain the suppression patterns of different bottomonia states with respect to centrality at various available collision energies and compare them with the available experimental data.
|
1610.04096
|
Marcela Gonz\'alez
|
Carolina Arbel\'aez, Marcela Gonz\'alez, Martin Hirsch, Sergey
Kovalenko
|
QCD Corrections and Long-Range Mechanisms of neutrinoless double beta
decay
|
Updated after erratum
|
Phys. Rev. D 94, 096014 (2016)
|
10.1103/PhysRevD.94.096014
|
IFIC/16-70
|
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Recently it has been demonstrated that QCD corrections are numerically
important for short-range mechanisms (SRM) of neutrinoless double beta decay
($0\nu\beta\beta$) mediated by heavy particle exchange. This is due to the
effect of color mismatch for certain effective operators, which leads to mixing
between different operators with vastly different nuclear matrix elements
(NMEs). In this note we analyze the QCD corrections for long-range mechanisms
(LRM), due to diagrams with light-neutrino exchange between a Standard Model
(V-A)$\times$(V-A) and a beyond the SM lepton number violating vertex. We argue
that in contrast to the SRM in the LRM case, there is no operator mixing from
color-mismatched operators. This is due to a combined effect of the nuclear
short-range correlations and color invariance. As a result, the QCD corrections
to the LRM amount to an effect no more than 60%, depending on the operator in
question. Although less crucial, taken into account QCD running makes
theoretical predictions for $0\nu\beta\beta$-decay more robust also for LRM
diagrams. We derive the current experimental constraints on the Wilson
coefficients for all LRM effective operators.
|
[
{
"created": "Thu, 13 Oct 2016 14:23:59 GMT",
"version": "v1"
},
{
"created": "Wed, 23 Nov 2016 14:52:34 GMT",
"version": "v2"
},
{
"created": "Fri, 20 Jul 2018 18:14:56 GMT",
"version": "v3"
}
] |
2018-07-24
|
[
[
"Arbeláez",
"Carolina",
""
],
[
"González",
"Marcela",
""
],
[
"Hirsch",
"Martin",
""
],
[
"Kovalenko",
"Sergey",
""
]
] |
Recently it has been demonstrated that QCD corrections are numerically important for short-range mechanisms (SRM) of neutrinoless double beta decay ($0\nu\beta\beta$) mediated by heavy particle exchange. This is due to the effect of color mismatch for certain effective operators, which leads to mixing between different operators with vastly different nuclear matrix elements (NMEs). In this note we analyze the QCD corrections for long-range mechanisms (LRM), due to diagrams with light-neutrino exchange between a Standard Model (V-A)$\times$(V-A) and a beyond the SM lepton number violating vertex. We argue that in contrast to the SRM in the LRM case, there is no operator mixing from color-mismatched operators. This is due to a combined effect of the nuclear short-range correlations and color invariance. As a result, the QCD corrections to the LRM amount to an effect no more than 60%, depending on the operator in question. Although less crucial, taken into account QCD running makes theoretical predictions for $0\nu\beta\beta$-decay more robust also for LRM diagrams. We derive the current experimental constraints on the Wilson coefficients for all LRM effective operators.
|
hep-ph/9302261
| null |
N. Kaiser, R. A. Malaney, G.D. Starkman
|
Neutrino-Lasing in The Early Universe
|
7 pages, 3 figures included as uuencoded file, CITA/93/7
|
Phys.Rev.Lett. 71 (1993) 1128-1131
|
10.1103/PhysRevLett.71.1128
| null |
hep-ph astro-ph
| null |
Recently, Madsen has argued that relativistic decays of massive neutrinos
into lighter fermions and bosons may lead, via thermalization, to the formation
of a Bose condensate. If correct, this could generate mixed hot and cold dark
matter, with important consequences for structure formation.
From a detailed study of such decays, we arrive at substantially different
conclusions; for a wide range of masses and decay times, we find that
stimulated emission of bosons dominates the decay. This phenomenon can best be
described as a neutrino laser, pumped by the QCD phase transition. We discuss
the implications for structure formation and the dark-matter problem.
|
[
{
"created": "Mon, 15 Feb 1993 16:15:43 GMT",
"version": "v1"
},
{
"created": "Thu, 18 Feb 1993 18:10:27 GMT",
"version": "v2"
}
] |
2009-10-22
|
[
[
"Kaiser",
"N.",
""
],
[
"Malaney",
"R. A.",
""
],
[
"Starkman",
"G. D.",
""
]
] |
Recently, Madsen has argued that relativistic decays of massive neutrinos into lighter fermions and bosons may lead, via thermalization, to the formation of a Bose condensate. If correct, this could generate mixed hot and cold dark matter, with important consequences for structure formation. From a detailed study of such decays, we arrive at substantially different conclusions; for a wide range of masses and decay times, we find that stimulated emission of bosons dominates the decay. This phenomenon can best be described as a neutrino laser, pumped by the QCD phase transition. We discuss the implications for structure formation and the dark-matter problem.
|
1812.04858
|
Zalak Shah
|
Zalak Shah, Keval Gandhi, Ajay Kumar Rai
|
Spectroscopy of light $N^{*}$ baryons
|
8 pages, 2 Figures, to be published in Chinese Physics C
|
Chinese Physics C 43(3):034102 2019
|
10.1088/1674-1137/43/3/034102
| null |
hep-ph nucl-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We present the masses of N baryon upto 3300 MeV. The radial and orbital
excited states are determined using hypercentral constituent quark model with
first order correction. The obtained masses are compared with experimental
results and other theoretical prediction. The Regge Trajectories are also
determined in (n, $M^2$) and (J, $M^2$) planes. Moreover, the magnetic moments
for $J^{P}= \frac{1}{2}^{+}, \frac{1}{2}^{-}$ are calculated. We also calculate
the $N\pi$ decay width of excited nucleons.
|
[
{
"created": "Wed, 12 Dec 2018 09:08:47 GMT",
"version": "v1"
}
] |
2019-05-22
|
[
[
"Shah",
"Zalak",
""
],
[
"Gandhi",
"Keval",
""
],
[
"Rai",
"Ajay Kumar",
""
]
] |
We present the masses of N baryon upto 3300 MeV. The radial and orbital excited states are determined using hypercentral constituent quark model with first order correction. The obtained masses are compared with experimental results and other theoretical prediction. The Regge Trajectories are also determined in (n, $M^2$) and (J, $M^2$) planes. Moreover, the magnetic moments for $J^{P}= \frac{1}{2}^{+}, \frac{1}{2}^{-}$ are calculated. We also calculate the $N\pi$ decay width of excited nucleons.
|
hep-ph/9708233
|
Daniele Treleani
|
Giorgio Calucci and Daniele Treleani
|
Self-Similarity of the Negative Binomial Multiplicity Distributions
|
10 pages, plane tex, no figures
|
Phys.Rev. D57 (1998) 602-605
|
10.1103/PhysRevD.57.602
| null |
hep-ph
| null |
The negative binomial distribution is self similar: If the spectrum over the
whole rapidity range gives rise to a negative binomial, in absence of
correlation and if the source is unique, also a partial range in rapidity gives
rise to the same distribution. The property is not seen in experimental data,
which are rather consistent with the presence of a number of independent
sources. When multiplicities are very large self similarity might be used to
isolate individual sources is a complex production process.
|
[
{
"created": "Mon, 4 Aug 1997 14:14:49 GMT",
"version": "v1"
}
] |
2009-10-30
|
[
[
"Calucci",
"Giorgio",
""
],
[
"Treleani",
"Daniele",
""
]
] |
The negative binomial distribution is self similar: If the spectrum over the whole rapidity range gives rise to a negative binomial, in absence of correlation and if the source is unique, also a partial range in rapidity gives rise to the same distribution. The property is not seen in experimental data, which are rather consistent with the presence of a number of independent sources. When multiplicities are very large self similarity might be used to isolate individual sources is a complex production process.
|
1808.05613
|
Edoardo Vitagliano
|
Oleg E. Kalashev, Alexander Kusenko and Edoardo Vitagliano
|
Cosmic infrared background excess from axion-like particles and
implications for multi-messenger observations of blazars
|
11 pages, 5 figures. Several changes to match published version
|
Phys. Rev. D 99, 023002 (2019)
|
10.1103/PhysRevD.99.023002
|
MPP-2018-213
|
hep-ph astro-ph.CO
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
The first measurement of the diffuse background spectrum at 0.8-1.7 $\mu
\rm{m}$ from the CIBER experiment has revealed a significant excess of the
cosmic infrared background (CIB) radiation compared to the theoretically
expected spectrum. We revisit the hypothesis that decays of axionlike particle
(ALP) can explain this excess, extending previous analyses to the case of a
warm relic population. We show that such a scenario is not excluded by
anisotropy measurements nor by stellar cooling arguments. Moreover, we find
that the increased extragalactic background light (EBL) does not contradict
observations of blazar spectra. Furthermore, the increased EBL attenuates the
diffuse TeV gamma-ray flux and alleviates the tension between the detected
neutrino and gamma ray fluxes.
|
[
{
"created": "Thu, 16 Aug 2018 17:59:52 GMT",
"version": "v1"
},
{
"created": "Thu, 3 Jan 2019 11:31:38 GMT",
"version": "v2"
}
] |
2019-01-04
|
[
[
"Kalashev",
"Oleg E.",
""
],
[
"Kusenko",
"Alexander",
""
],
[
"Vitagliano",
"Edoardo",
""
]
] |
The first measurement of the diffuse background spectrum at 0.8-1.7 $\mu \rm{m}$ from the CIBER experiment has revealed a significant excess of the cosmic infrared background (CIB) radiation compared to the theoretically expected spectrum. We revisit the hypothesis that decays of axionlike particle (ALP) can explain this excess, extending previous analyses to the case of a warm relic population. We show that such a scenario is not excluded by anisotropy measurements nor by stellar cooling arguments. Moreover, we find that the increased extragalactic background light (EBL) does not contradict observations of blazar spectra. Furthermore, the increased EBL attenuates the diffuse TeV gamma-ray flux and alleviates the tension between the detected neutrino and gamma ray fluxes.
|
1509.04016
|
Mukesh Kumar
|
Mukesh Kumar, Xifeng Ruan, Rashidul Islam, Alan S. Cornell, Max Klein,
Uta Klein and Bruce Mellado
|
Probing anomalous couplings using di-Higgs production in electron-proton
collisions
| null |
Physics Letters B 764 (2017) 247-253
|
10.1016/j.physletb.2016.11.039
|
WITS-MITP 019
|
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
A proposed high energy Future Circular Hadron-Electron Collider would provide
sufficient energy in a clean environment to probe di-Higgs production. Using
this channel we show that the azimuthal angle correlation between the missing
transverse energy and the forward jet is a very good probe for the non-standard
$hhh$ and $hhWW$ couplings. We give the exclusion limits on these couplings as
a function of integrated luminosity at a $95$\% C.L. using the fiducial cross
sections. With appropriate error fitting methodology we find that the Higgs
boson self coupling could be measured to be $g^{(1)}_{hhh} =
1.00^{+0.24(0.14)}_{-0.17(0.12)}$ of its expected Standard Model value at
$\sqrt s = 3.5(5.0)$ TeV for an ultimate 10 ab$^{-1}$ of integrated luminosity.
|
[
{
"created": "Mon, 14 Sep 2015 10:15:06 GMT",
"version": "v1"
},
{
"created": "Sat, 19 Nov 2016 09:09:42 GMT",
"version": "v2"
},
{
"created": "Wed, 30 Nov 2016 21:05:16 GMT",
"version": "v3"
}
] |
2016-12-02
|
[
[
"Kumar",
"Mukesh",
""
],
[
"Ruan",
"Xifeng",
""
],
[
"Islam",
"Rashidul",
""
],
[
"Cornell",
"Alan S.",
""
],
[
"Klein",
"Max",
""
],
[
"Klein",
"Uta",
""
],
[
"Mellado",
"Bruce",
""
]
] |
A proposed high energy Future Circular Hadron-Electron Collider would provide sufficient energy in a clean environment to probe di-Higgs production. Using this channel we show that the azimuthal angle correlation between the missing transverse energy and the forward jet is a very good probe for the non-standard $hhh$ and $hhWW$ couplings. We give the exclusion limits on these couplings as a function of integrated luminosity at a $95$\% C.L. using the fiducial cross sections. With appropriate error fitting methodology we find that the Higgs boson self coupling could be measured to be $g^{(1)}_{hhh} = 1.00^{+0.24(0.14)}_{-0.17(0.12)}$ of its expected Standard Model value at $\sqrt s = 3.5(5.0)$ TeV for an ultimate 10 ab$^{-1}$ of integrated luminosity.
|
hep-ph/0201268
|
Anupam Mazumdar
|
Anupam Mazumdar, Rouzbeh Allahverdi, Kari Enqvist, Abdel
P\'erez-Lorenzana
|
Baryogenesis in models with large extra dimensions
|
11 pages, contribution to COSMO-01 conference
| null | null | null |
hep-ph
| null |
We describe how difficult it is to realise baryogenesis in models where the
fundamental scale in nature is as low as TeV. The problem becomes even more
challenging if we assume that there are only {\it two} extra compact spatial
dimensions, because thermal history of such a Universe is strongly constrained
by various cosmological and astrophysical bounds which translate the maximal
temperature of the Universe which must not exceed $\sim {\cal O}(10)$MeV. This
simply reiterates that the observed baryon asymmetry must be synthesised just
above the nucleosynthesis scale. In this talk we address how to construct a
simple model which can overcome this challenge.
|
[
{
"created": "Tue, 29 Jan 2002 14:52:46 GMT",
"version": "v1"
}
] |
2007-05-23
|
[
[
"Mazumdar",
"Anupam",
""
],
[
"Allahverdi",
"Rouzbeh",
""
],
[
"Enqvist",
"Kari",
""
],
[
"Pérez-Lorenzana",
"Abdel",
""
]
] |
We describe how difficult it is to realise baryogenesis in models where the fundamental scale in nature is as low as TeV. The problem becomes even more challenging if we assume that there are only {\it two} extra compact spatial dimensions, because thermal history of such a Universe is strongly constrained by various cosmological and astrophysical bounds which translate the maximal temperature of the Universe which must not exceed $\sim {\cal O}(10)$MeV. This simply reiterates that the observed baryon asymmetry must be synthesised just above the nucleosynthesis scale. In this talk we address how to construct a simple model which can overcome this challenge.
|
hep-ph/0209014
|
Y. Y. Keum
|
Y.Y. Keum and A.I. Sanda
|
Possible Large Direct CP Violations in Charmless B-Decays
|
18 pages, latex, 8 figures and 8 tables, typos corrected and added
more tables and references. Presented at the 3rd workshop on Higher
Luminosity B Factory, 6-7 August 2002, Kanagawa, Japan; Submitted to Phys.
Rev. D
|
Phys.Rev.D67:054009,2003
|
10.1103/PhysRevD.67.054009
|
DPNU-02-29
|
hep-ph
| null |
We discuss the perturbative QCD approach for the exclusive two body B-meson
decays to light mesons. We briefly review its ingredients and some important
theoretical issues on factorization approach. We show numerical results which
are compatible with present experimantal data for the charmless B-meson decays.
Specailly we predict the possibility of large direct CP violation effects in
$B^0 \to \pi^{+}\pi^{-}$ $(23\pm7 %)$ and $B^0\to K^{+}\pi^{-}$ $(-17\pm5%)$.
In the last section we investigate two methods to determine the weak phases
$\phi_2$ and $\phi_3$ from $B \to \pi\pi,K\pi$ processes. We obtain bounds on
$\phi_2$ and $\phi_3$ from present experimental measurements.
|
[
{
"created": "Mon, 2 Sep 2002 10:47:46 GMT",
"version": "v1"
},
{
"created": "Thu, 3 Oct 2002 10:46:01 GMT",
"version": "v2"
}
] |
2014-11-17
|
[
[
"Keum",
"Y. Y.",
""
],
[
"Sanda",
"A. I.",
""
]
] |
We discuss the perturbative QCD approach for the exclusive two body B-meson decays to light mesons. We briefly review its ingredients and some important theoretical issues on factorization approach. We show numerical results which are compatible with present experimantal data for the charmless B-meson decays. Specailly we predict the possibility of large direct CP violation effects in $B^0 \to \pi^{+}\pi^{-}$ $(23\pm7 %)$ and $B^0\to K^{+}\pi^{-}$ $(-17\pm5%)$. In the last section we investigate two methods to determine the weak phases $\phi_2$ and $\phi_3$ from $B \to \pi\pi,K\pi$ processes. We obtain bounds on $\phi_2$ and $\phi_3$ from present experimental measurements.
|
2404.10066
|
Hailin Xu
|
Timon Emken, Rouven Essig, Hailin Xu
|
Solar reflection of dark matter with dark-photon mediators
|
40 pages, 23 figures including appendices and references
| null | null | null |
hep-ph astro-ph.CO
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We consider the scattering of low-mass halo dark-matter particles in the hot
plasma of the Sun, focusing on dark matter that interact with ordinary matter
through a dark-photon mediator. The resulting ``solar-reflected'' dark matter
(SRDM) component contains high-velocity particles, which significantly extend
the sensitivity of terrestrial direct-detection experiments to sub-MeV
dark-matter masses. We use a detailed Monte-Carlo simulation to model the
propagation and scattering of dark-matter particles in the Sun, including
thermal effects, with special emphasis on ultralight dark-photon mediators. We
study the properties of the SRDM flux, obtain exclusion limits from various
direct-detection experiments, and provide projections for future experiments,
focusing especially on those with silicon and xenon targets. We find that
proposed future experiments with xenon and silicon targets can probe the entire
``freeze-in benchmark,'' in which dark matter is coupled to an ultralight dark
photon, including dark-matter masses as low as $\mathcal{O}$(keV). Our
simulations and SRDM fluxes are publicly available.
|
[
{
"created": "Mon, 15 Apr 2024 18:14:54 GMT",
"version": "v1"
}
] |
2024-04-17
|
[
[
"Emken",
"Timon",
""
],
[
"Essig",
"Rouven",
""
],
[
"Xu",
"Hailin",
""
]
] |
We consider the scattering of low-mass halo dark-matter particles in the hot plasma of the Sun, focusing on dark matter that interact with ordinary matter through a dark-photon mediator. The resulting ``solar-reflected'' dark matter (SRDM) component contains high-velocity particles, which significantly extend the sensitivity of terrestrial direct-detection experiments to sub-MeV dark-matter masses. We use a detailed Monte-Carlo simulation to model the propagation and scattering of dark-matter particles in the Sun, including thermal effects, with special emphasis on ultralight dark-photon mediators. We study the properties of the SRDM flux, obtain exclusion limits from various direct-detection experiments, and provide projections for future experiments, focusing especially on those with silicon and xenon targets. We find that proposed future experiments with xenon and silicon targets can probe the entire ``freeze-in benchmark,'' in which dark matter is coupled to an ultralight dark photon, including dark-matter masses as low as $\mathcal{O}$(keV). Our simulations and SRDM fluxes are publicly available.
|
hep-ph/9811498
|
Otto Kong
|
M. Bisset, O.C.W. Kong, C. Macesanu, and L.H. Orr (Rochester U.)
|
Supersymmetry without R-parity : Constraints from Leptonic Phenomenology
|
56 pages Revtex with figures incorporated; typos (including
transcription typo in Table II) and minor corrections; proof-read version, to
appear in Phys. Rev. D
|
Phys.Rev. D62 (2000) 035001
|
10.1103/PhysRevD.62.035001
|
UR-1524,TUIMP-TH-98/101
|
hep-ph
| null |
R-parity conservation is an {\it ad hoc} assumption in the most popular
version of the supersymmetric standard model. Most studies of models which do
allow for R-parity violation have been restricted to various limiting
scenarios. The single-VEV parametrization used in this paper provides a
workable framework to analyze phenomenology of the most general theory of SUSY
without R-parity. We perform a comprehensive study of leptonic phenomenology at
tree-level. Experimental constraints on various processes are studied
individually and then combined to yield regions of admissible parameter space.
In particular, we show that large R-parity violating bilinear couplings are not
ruled out, especially for large $\tan\beta$.
|
[
{
"created": "Sat, 28 Nov 1998 00:30:21 GMT",
"version": "v1"
},
{
"created": "Wed, 9 Dec 1998 22:06:06 GMT",
"version": "v2"
},
{
"created": "Sat, 18 Mar 2000 06:16:31 GMT",
"version": "v3"
},
{
"created": "Mon, 24 Apr 2000 06:51:55 GMT",
"version": "v4"
}
] |
2009-10-31
|
[
[
"Bisset",
"M.",
"",
"Rochester U."
],
[
"Kong",
"O. C. W.",
"",
"Rochester U."
],
[
"Macesanu",
"C.",
"",
"Rochester U."
],
[
"Orr",
"L. H.",
"",
"Rochester U."
]
] |
R-parity conservation is an {\it ad hoc} assumption in the most popular version of the supersymmetric standard model. Most studies of models which do allow for R-parity violation have been restricted to various limiting scenarios. The single-VEV parametrization used in this paper provides a workable framework to analyze phenomenology of the most general theory of SUSY without R-parity. We perform a comprehensive study of leptonic phenomenology at tree-level. Experimental constraints on various processes are studied individually and then combined to yield regions of admissible parameter space. In particular, we show that large R-parity violating bilinear couplings are not ruled out, especially for large $\tan\beta$.
|
1412.8367
|
Micha{\AA} Szleper
|
Micha{\l} Szleper
|
The Higgs boson and the physics of $WW$ scattering before and after
Higgs discovery
|
ISBN 978-83-934358-7-6, 166 pages, v2 - some references added/updated
| null | null | null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
This work presents a comprehensive overview of the physics of vector boson
scattering (VBS) in the dawn of Run 2 of the Large Hadron Collider (LHC).
Recalled here are some of its most basic physics principles, the historical
relation between vector boson scattering and the Higgs boson, then discussed is
the physics of VBS processes after Higgs discovery, and the prospects for
future VBS measurements at the LHC and beyond. This monograph reviews the work
of many people, including previously published theoretical work as well as
experimental results, but also contains a portion of original simulation-based
studies that have not been published before.
|
[
{
"created": "Mon, 29 Dec 2014 15:14:02 GMT",
"version": "v1"
},
{
"created": "Thu, 5 Mar 2015 16:08:18 GMT",
"version": "v2"
}
] |
2016-08-08
|
[
[
"Szleper",
"Michał",
""
]
] |
This work presents a comprehensive overview of the physics of vector boson scattering (VBS) in the dawn of Run 2 of the Large Hadron Collider (LHC). Recalled here are some of its most basic physics principles, the historical relation between vector boson scattering and the Higgs boson, then discussed is the physics of VBS processes after Higgs discovery, and the prospects for future VBS measurements at the LHC and beyond. This monograph reviews the work of many people, including previously published theoretical work as well as experimental results, but also contains a portion of original simulation-based studies that have not been published before.
|
2201.09980
|
Aftab Ahmad A
|
Aftab Ahmad and Ali Murad
|
Color-flavor dependence of the Nambu-Jona-Lasinio model and QCD phase
diagram
|
22 pages, 21 figures
| null |
10.1088/1674-1137/ac6cd8
| null |
hep-ph nucl-th
|
http://creativecommons.org/licenses/by/4.0/
|
We study the dynamical chiral symmetry breaking/restoration for the various
numbers of light quarks flavors $N_f$ and colors $N_c$, using the
Nambu-Jona-Lasinio (NJL) model of quarks, dressed with a color-flavor
dependence of effective coupling. Initially, we set $N_f = 2$, and varying the
number of colors $N_c$, we find that the dynamical chiral symmetry is broken
when $N_c$ exceeds to its critical value $N^{c}_{c}\approx2.2$. Secondly, we
take $N_c = 3$, and varying $N_f$, we observed that the dynamical chiral
symmetry is restored when $N_f$ reaches to its critical value
$N^{c}_{f}\approx8$. The strong interplay observed between $N_c$ and $N_f$,
i.e., $N_c$ anti-screens the strong interactions by strengthening the dynamical
mass and quark-antiquark condensate, while $N_f$ screens the strong interaction
by suppressing both the parameters. We further sketch the quantum
chromodynamics (QCD) phase diagram at finite temperature $T$ and quark chemical
potential $\mu$ for various $N_c$ and $N_f$. At finite $T$ and $\mu$, we
observed that the critical number of colors $N^{c}_c$ enhances while the
critical number of flavors $N^{c}_f$ suppresses as $T$ and $\mu$ increases. Of
course, the parameters $T$ and $\mu$ produce the screening effect.
Consequently, the critical temperature $T_c$, $\mu_c$ and co-ordinates of the
critical endpoint $(T^{E}_c,\mu^{E}_c)$ in the QCD phase diagram enhances as
$N_c$ increases while suppresses when $N_f$ increases. Our findings agree with
the Lattice QCD and Schwinger-Dyson equations predictions.
|
[
{
"created": "Mon, 24 Jan 2022 22:17:35 GMT",
"version": "v1"
}
] |
2022-08-03
|
[
[
"Ahmad",
"Aftab",
""
],
[
"Murad",
"Ali",
""
]
] |
We study the dynamical chiral symmetry breaking/restoration for the various numbers of light quarks flavors $N_f$ and colors $N_c$, using the Nambu-Jona-Lasinio (NJL) model of quarks, dressed with a color-flavor dependence of effective coupling. Initially, we set $N_f = 2$, and varying the number of colors $N_c$, we find that the dynamical chiral symmetry is broken when $N_c$ exceeds to its critical value $N^{c}_{c}\approx2.2$. Secondly, we take $N_c = 3$, and varying $N_f$, we observed that the dynamical chiral symmetry is restored when $N_f$ reaches to its critical value $N^{c}_{f}\approx8$. The strong interplay observed between $N_c$ and $N_f$, i.e., $N_c$ anti-screens the strong interactions by strengthening the dynamical mass and quark-antiquark condensate, while $N_f$ screens the strong interaction by suppressing both the parameters. We further sketch the quantum chromodynamics (QCD) phase diagram at finite temperature $T$ and quark chemical potential $\mu$ for various $N_c$ and $N_f$. At finite $T$ and $\mu$, we observed that the critical number of colors $N^{c}_c$ enhances while the critical number of flavors $N^{c}_f$ suppresses as $T$ and $\mu$ increases. Of course, the parameters $T$ and $\mu$ produce the screening effect. Consequently, the critical temperature $T_c$, $\mu_c$ and co-ordinates of the critical endpoint $(T^{E}_c,\mu^{E}_c)$ in the QCD phase diagram enhances as $N_c$ increases while suppresses when $N_f$ increases. Our findings agree with the Lattice QCD and Schwinger-Dyson equations predictions.
|
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