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|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
hep-ph/9903471
|
Yu
|
Yu Zeng-Hui (1,3), Herbert. Pietschmann (1), Ma Wen-Gan (2,3), Han
Liang (3), Jiang Yi (3) ((1)Institut fur Theoretische Physik, Universitat
Wien (2)CCAST (World Laboratory), Beijing, P.R.China (3)Department of Modern
Physics, University of Science and Technology of China (USTC), Hefei, Anhui
P.R.China)
|
$\gamma\gamma \to t\bar{c}+c\bar{t}$ in a supersymmetric theory with an
explicit R-parity violation
|
16 pages, 6 figures
|
Eur.Phys.J.C16:541-546,2000
|
10.1007/s100520000438
|
UWThPh-1999-23
|
hep-ph
| null |
We studied the process $\gamma\gamma \to t\bar{c}+c\bar{t}$ in a $R_{p}$
violating supersymmetric Model with the effects from both B- and L-violating
interactions. The calculation shows that it is possible to detect a $R_{p}$
violating signal at the Next Linear Collider. Information about the B-violating
interaction in this model could be obtained under very clean background, if we
take the present upper bounds for the parameters in the supersymmetric $\rlap/
R_{p}$ interactions. Even if we can not detect a signal of $\rlap/R_{p}$ in the
experiment, we may get more stringent constraints on the heavy-flavor
$\rlap/R_{p}$ couplings.
|
[
{
"created": "Wed, 24 Mar 1999 12:27:04 GMT",
"version": "v1"
},
{
"created": "Mon, 20 Sep 1999 07:22:31 GMT",
"version": "v2"
},
{
"created": "Sat, 6 May 2000 11:01:07 GMT",
"version": "v3"
}
] |
2009-01-07
|
[
[
"Zeng-Hui",
"Yu",
""
],
[
"Pietschmann",
"Herbert.",
""
],
[
"Wen-Gan",
"Ma",
""
],
[
"Liang",
"Han",
""
],
[
"Yi",
"Jiang",
""
]
] |
We studied the process $\gamma\gamma \to t\bar{c}+c\bar{t}$ in a $R_{p}$ violating supersymmetric Model with the effects from both B- and L-violating interactions. The calculation shows that it is possible to detect a $R_{p}$ violating signal at the Next Linear Collider. Information about the B-violating interaction in this model could be obtained under very clean background, if we take the present upper bounds for the parameters in the supersymmetric $\rlap/ R_{p}$ interactions. Even if we can not detect a signal of $\rlap/R_{p}$ in the experiment, we may get more stringent constraints on the heavy-flavor $\rlap/R_{p}$ couplings.
|
1110.0022
|
Alessandro Mirizzi
|
Alessandro Mirizzi (Hamburg U., II Inst. Theor. Phys.), Pasquale D.
Serpico (LAPTh, Annecy-Le-Vieux)
|
Instability in the dense supernova neutrino gas with flavor-dependent
angular distributions
|
v2: 5 pages, 2 eps figures. Revised version. Discussion enlarged with
a new part including a stability analysis. Conclusions unchanged. Matches the
version published on PRL
|
Physical Review Letters 108, 231102 (2012)
|
10.1103/PhysRevLett.108.231102
|
LAPTH-036/11
|
hep-ph astro-ph.GA
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
The usual description of self-induced flavor conversions for neutrinos
(\nu's) in supernovae is based on the simplified assumption that all the \nu's
of the different species are emitted "half-isotropically" by a common
neutrinosphere, in analogy to a blackbody emission. However, realistic
supernova simulations show that \nu angular distributions at decoupling are far
from being half-isotropic and, above all, are flavor-dependent. We show that
flavor-dependent angular distributions may lead to crossing points in the
angular spectra of different \nu species (where F_{\nu_e}=F_{\nu_x} and
F_{{\bar\nu}_e}=F_{{\bar\nu}_x}) around which a new multi-angle instability can
develop. To characterize this effect, we carry out a linearized flavor
stability analysis for different SN neutrino angular distributions. We find
that this instability can shift the onset of the flavor conversions toward
low-radii and produce a smearing of the splitting features found with trivial
$\nu$ emission models. As a result the spectral differences among \nu's of
different flavors could be strongly reduced.
|
[
{
"created": "Fri, 30 Sep 2011 20:50:02 GMT",
"version": "v1"
},
{
"created": "Wed, 6 Jun 2012 16:04:39 GMT",
"version": "v2"
}
] |
2013-05-30
|
[
[
"Mirizzi",
"Alessandro",
"",
"Hamburg U., II Inst. Theor. Phys."
],
[
"Serpico",
"Pasquale D.",
"",
"LAPTh, Annecy-Le-Vieux"
]
] |
The usual description of self-induced flavor conversions for neutrinos (\nu's) in supernovae is based on the simplified assumption that all the \nu's of the different species are emitted "half-isotropically" by a common neutrinosphere, in analogy to a blackbody emission. However, realistic supernova simulations show that \nu angular distributions at decoupling are far from being half-isotropic and, above all, are flavor-dependent. We show that flavor-dependent angular distributions may lead to crossing points in the angular spectra of different \nu species (where F_{\nu_e}=F_{\nu_x} and F_{{\bar\nu}_e}=F_{{\bar\nu}_x}) around which a new multi-angle instability can develop. To characterize this effect, we carry out a linearized flavor stability analysis for different SN neutrino angular distributions. We find that this instability can shift the onset of the flavor conversions toward low-radii and produce a smearing of the splitting features found with trivial $\nu$ emission models. As a result the spectral differences among \nu's of different flavors could be strongly reduced.
|
1205.1019
|
Zhong-Bo Kang
|
Zhong-Bo Kang, Jian-Wei Qiu
|
QCD evolution of naive-time-reversal-odd parton distribution functions
|
5 pages, 2 figures
|
Phys. Lett. B 713, 273 (2012)
|
10.1016/j.physletb.2012.06.021
| null |
hep-ph hep-ex
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We reexamine the derivation of the leading order QCD evolution equations of
twist-3 quark-gluon correlation functions, $T_{q,F}(x,x)$ and
$T^{(\sigma)}_{q,F}(x,x)$, which are the first transverse-momentum-moment of
the naive-time-reversal-odd parton distribution functions - the Sivers and
Boer-Mulders function, respectively. The evolution equations were derived by
several groups with apparent differences. We identify the sources that are
responsible for the differences, and are able to reconcile the results from
various groups.
|
[
{
"created": "Fri, 4 May 2012 17:53:51 GMT",
"version": "v1"
}
] |
2012-06-22
|
[
[
"Kang",
"Zhong-Bo",
""
],
[
"Qiu",
"Jian-Wei",
""
]
] |
We reexamine the derivation of the leading order QCD evolution equations of twist-3 quark-gluon correlation functions, $T_{q,F}(x,x)$ and $T^{(\sigma)}_{q,F}(x,x)$, which are the first transverse-momentum-moment of the naive-time-reversal-odd parton distribution functions - the Sivers and Boer-Mulders function, respectively. The evolution equations were derived by several groups with apparent differences. We identify the sources that are responsible for the differences, and are able to reconcile the results from various groups.
|
hep-ph/0306091
|
Dorota Kotlorz
|
Dorota Kotlorz, Andrzej Kotlorz
|
Double Logarithmic Terms $ln^2x$ in the Heavy Quark Production
$\sigma(P\bar P \to h\bar h) - \sigma(PP \to h\bar h)$ Cross Sections
|
16 pages, 6 figures, (http://th-www.if.uj.edu.pl/acta/vol34)
|
Acta Phys.Polon.B34:3305-3320,2003
| null | null |
hep-ph
| null |
Predictions for the difference of proton-antiproton and proton-proton cross
sections in the heavy quark production within LO DGLAP analysis together with
the $ln^2x$ terms resummation are presented. An important role of the double
logarithmic $ln^2x$ corrections in a case of the large rapidity gap between a
quark and an antiquark is discussed.
|
[
{
"created": "Wed, 11 Jun 2003 12:13:20 GMT",
"version": "v1"
}
] |
2014-11-17
|
[
[
"Kotlorz",
"Dorota",
""
],
[
"Kotlorz",
"Andrzej",
""
]
] |
Predictions for the difference of proton-antiproton and proton-proton cross sections in the heavy quark production within LO DGLAP analysis together with the $ln^2x$ terms resummation are presented. An important role of the double logarithmic $ln^2x$ corrections in a case of the large rapidity gap between a quark and an antiquark is discussed.
|
hep-ph/0503039
|
Andrzej Czarnecki
|
I. Blokland, A. Czarnecki, M. Slusarczyk, and F. Tkachov
|
Next-to-next-to-leading order calculations for heavy-to-light decays
|
12 pages, corrected typos in the appendix
|
Phys.Rev.D71:054004,2005; Erratum-ibid.D79:019901,2009
|
10.1103/PhysRevD.71.054004 10.1103/PhysRevD.79.019901
|
Alberta Thy 11-04, UVIC-TH-04/07
|
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We present technical aspects of next-to-next-to-leading order calculations
for heavy-to-light decays such as top quark decay, semileptonic b quark decay
into a u quark, muon decay, and radiative decays like b -> s gamma. Algebraic
reduction of integrals to a set of master integrals is described, methods of
determining the master integrals are presented, and a complete list of master
integrals is given. As a sample application, the top quark decay width is
calculated to O(alpha_s^2) accuracy.
|
[
{
"created": "Thu, 3 Mar 2005 23:55:11 GMT",
"version": "v1"
},
{
"created": "Wed, 14 Jan 2009 17:20:05 GMT",
"version": "v2"
}
] |
2014-11-18
|
[
[
"Blokland",
"I.",
""
],
[
"Czarnecki",
"A.",
""
],
[
"Slusarczyk",
"M.",
""
],
[
"Tkachov",
"F.",
""
]
] |
We present technical aspects of next-to-next-to-leading order calculations for heavy-to-light decays such as top quark decay, semileptonic b quark decay into a u quark, muon decay, and radiative decays like b -> s gamma. Algebraic reduction of integrals to a set of master integrals is described, methods of determining the master integrals are presented, and a complete list of master integrals is given. As a sample application, the top quark decay width is calculated to O(alpha_s^2) accuracy.
|
1211.3922
|
Graham Shore
|
G. M. Shore
|
Polarized Structure Functions and Two-Photon Physics at Super-B
|
29 pages, 8 figures
| null |
10.1140/epjc/s10052-013-2340-y
| null |
hep-ph hep-ex
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
The potential of polarized, high-luminosity, moderate-energy e+e- colliders
for performing unique measurements in fundamental QCD is described, with
particular reference to the proposed Super-B facility. An extensive programme
of 2-photon physics is proposed, focusing on measurements of the polarized
photon structure functions g1 and g2 and pseudoscalar meson transition
functions. The experimental requirements for Super-B to make the first
measurement of the first moment sum rule for the off-shell polarized photon
structure function g1(x,Q^2;K^2) are described in detail. Cross-section
formulae and experimental issues for investigations of NLO and higher-twist
effects in g1 and g2 together with exclusive 2-photon meson production are
presented. This programme of QCD studies complements the core mission of
Super-B as a high-luminosity B factory investigating flavour physics and rare
processes signaling new physics beyond the standard model.
|
[
{
"created": "Fri, 16 Nov 2012 15:28:15 GMT",
"version": "v1"
},
{
"created": "Tue, 27 Nov 2012 16:02:15 GMT",
"version": "v2"
}
] |
2015-06-12
|
[
[
"Shore",
"G. M.",
""
]
] |
The potential of polarized, high-luminosity, moderate-energy e+e- colliders for performing unique measurements in fundamental QCD is described, with particular reference to the proposed Super-B facility. An extensive programme of 2-photon physics is proposed, focusing on measurements of the polarized photon structure functions g1 and g2 and pseudoscalar meson transition functions. The experimental requirements for Super-B to make the first measurement of the first moment sum rule for the off-shell polarized photon structure function g1(x,Q^2;K^2) are described in detail. Cross-section formulae and experimental issues for investigations of NLO and higher-twist effects in g1 and g2 together with exclusive 2-photon meson production are presented. This programme of QCD studies complements the core mission of Super-B as a high-luminosity B factory investigating flavour physics and rare processes signaling new physics beyond the standard model.
|
hep-ph/0511275
|
Asmaa Abada
|
Asmaa Abada, Gautam Bhattacharyya, Marta Losada
|
Neutrinos in the simplest little Higgs scenario and TeV leptogenesis
|
10 pages, latex, v2: refs and comments added, to appear in PRD
|
Phys.Rev. D73 (2006) 033006
|
10.1103/PhysRevD.73.033006
|
LPT Orsay/05-03,CI-UAN 05-91FT, SINP/TNP/05-23
|
hep-ph
| null |
The little Higgs scenario may provide an interesting framework to accommodate
TeV scale leptogenesis because a TeV Majorana mass of the right-handed neutrino
that we employ for the latter may find a natural place near the ultraviolet
cutoff of the former. In this work we study how a light neutrino spectrum,
generated radiatively, and TeV scale leptogenesis can be embedded in the
simplest little
Higgs framework. Alternatively, we highlight how the neutrino Yukawa textures
of the latter are constrained.
|
[
{
"created": "Wed, 23 Nov 2005 16:43:27 GMT",
"version": "v1"
},
{
"created": "Tue, 21 Feb 2006 16:21:04 GMT",
"version": "v2"
}
] |
2016-09-06
|
[
[
"Abada",
"Asmaa",
""
],
[
"Bhattacharyya",
"Gautam",
""
],
[
"Losada",
"Marta",
""
]
] |
The little Higgs scenario may provide an interesting framework to accommodate TeV scale leptogenesis because a TeV Majorana mass of the right-handed neutrino that we employ for the latter may find a natural place near the ultraviolet cutoff of the former. In this work we study how a light neutrino spectrum, generated radiatively, and TeV scale leptogenesis can be embedded in the simplest little Higgs framework. Alternatively, we highlight how the neutrino Yukawa textures of the latter are constrained.
|
0812.4375
|
Luca Panizzi
|
M. Beccaria (Salento U. & INFN, Lecce), G. Macorini (ICTP, Trieste),
E. Mirabella (Munich, Max Planck Inst.), L. Panizzi (Trieste U., Dept. Theor
Phys & INFN, Trieste), F. M. Renard (Montpellier U.), C. Verzegnassi (Trieste
U., Dept. Theor Phys & INFN, Trieste)
|
One-loop electroweak effects on stop-chargino production at LHC
|
27 pages, 10 figures, Hard QED radiation added
|
Int.J.Mod.Phys.A24:5539-5559
|
10.1142/S0217751X09047454
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
The process of stop-chargino production at LHC has been calculated in the
Minimal Supersymmetric Standard Model at the complete electroweak one-loop
level, assuming a mSUGRA symmetry breaking scheme. Several properties of the
angular and invariant mass distributions of the basic bottom-gluon to
stop-chargino amplitudes have been derived. For a meaningful collection of
different benchmark points the overall electroweak one-loop effects are at most
of the order of a few percent. At the realistically expected LHC accuracy, the
main supersymmetric electroweak features of the process can be therefore
essentially derived in this theoretical scheme from the simple Born level
expressions.
|
[
{
"created": "Tue, 23 Dec 2008 12:12:41 GMT",
"version": "v1"
},
{
"created": "Thu, 19 Feb 2009 15:25:38 GMT",
"version": "v2"
},
{
"created": "Thu, 9 Jul 2009 10:55:33 GMT",
"version": "v3"
}
] |
2010-01-26
|
[
[
"Beccaria",
"M.",
"",
"Salento U. & INFN, Lecce"
],
[
"Macorini",
"G.",
"",
"ICTP, Trieste"
],
[
"Mirabella",
"E.",
"",
"Munich, Max Planck Inst."
],
[
"Panizzi",
"L.",
"",
"Trieste U., Dept. Theor\n Phys & INFN, Trieste"
],
[
"Renard",
"F. M.",
"",
"Montpellier U."
],
[
"Verzegnassi",
"C.",
"",
"Trieste\n U., Dept. Theor Phys & INFN, Trieste"
]
] |
The process of stop-chargino production at LHC has been calculated in the Minimal Supersymmetric Standard Model at the complete electroweak one-loop level, assuming a mSUGRA symmetry breaking scheme. Several properties of the angular and invariant mass distributions of the basic bottom-gluon to stop-chargino amplitudes have been derived. For a meaningful collection of different benchmark points the overall electroweak one-loop effects are at most of the order of a few percent. At the realistically expected LHC accuracy, the main supersymmetric electroweak features of the process can be therefore essentially derived in this theoretical scheme from the simple Born level expressions.
|
hep-ph/0408199
|
Antonio Pineda
|
Antonio Pineda
|
The Renormalization group in non-relativistic theories
|
12 pages, 4 figures, Invited talk at the 13th International Seminar
on High Energy Physics, Pushkinskie Gory, Russia, May 24-30, 2004
| null | null |
UB-ECM-PF-04-21
|
hep-ph
| null |
The resummation of logarithms in Quantum Field Theories is a long tale plenty
of successes, yet the resummation of logarithms in non-relativistic theories
has remained elusive. This was the most frustrating, since the first quantum
field theory log ever computed was the Lamb shift one. We briefly review recent
progress on the resummation of logarithms of $\alpha$, which appear in the
physics of non-relativistic states, using effective field theories. We put
special emphasis on the basic formalism.
|
[
{
"created": "Wed, 18 Aug 2004 07:25:04 GMT",
"version": "v1"
}
] |
2007-05-23
|
[
[
"Pineda",
"Antonio",
""
]
] |
The resummation of logarithms in Quantum Field Theories is a long tale plenty of successes, yet the resummation of logarithms in non-relativistic theories has remained elusive. This was the most frustrating, since the first quantum field theory log ever computed was the Lamb shift one. We briefly review recent progress on the resummation of logarithms of $\alpha$, which appear in the physics of non-relativistic states, using effective field theories. We put special emphasis on the basic formalism.
|
hep-ph/0702178
|
Serguei Molodtsov
|
S.V. Molodtsov, A.N. Sissakian, A.S. Sorin, G.M. Zinovjev
|
Properties of lightest mesons at finite temperature and quark/baryon
chemical potential in instanton model of QCD vacuum
|
9 pages, 3 figures
|
Phys.Part.Nucl.Lett.5:7-12,2008
|
10.1007/s11497-008-1002-1
| null |
hep-ph
| null |
The thermal and quark/baryon chemical potential dependences of quark
condensate and masses of $\pi$- and $\sigma$-mesons are studied in the
instanton model of the QCD vacuum in precritical region. The impact of
phonon-like excitations of instanton liquid on the characteristics of
$\sigma$-meson in such an environment is also examined.
|
[
{
"created": "Sun, 18 Feb 2007 13:32:02 GMT",
"version": "v1"
}
] |
2008-11-26
|
[
[
"Molodtsov",
"S. V.",
""
],
[
"Sissakian",
"A. N.",
""
],
[
"Sorin",
"A. S.",
""
],
[
"Zinovjev",
"G. M.",
""
]
] |
The thermal and quark/baryon chemical potential dependences of quark condensate and masses of $\pi$- and $\sigma$-mesons are studied in the instanton model of the QCD vacuum in precritical region. The impact of phonon-like excitations of instanton liquid on the characteristics of $\sigma$-meson in such an environment is also examined.
|
1806.06739
|
Artem Lipatov
|
N.A. Abdulov, H. Jung, A.V. Lipatov, G.I. Lykasov, M.A. Malyshev
|
Employing RHIC and LHC data to determine TMD gluon density in a proton
|
19 pages, 10 figures
|
Phys. Rev. D 98, 054010 (2018)
|
10.1103/PhysRevD.98.054010
|
DESY 18-094
|
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Transverse momentum dependent (TMD) parton distributions in a proton are
important in high energy physics from both theoretical and phenomenological
points of view. Using the latest RHIC and LHC data on the inclusive soft hadron
production in $pp$ and $AA$ collisions at small transverse momenta, we
determine the parameters of the initial TMD gluon density, derived in the
framework of quark-gluon string model at the low scale $\mu_0 \sim 1 - 2$ GeV
and refine its large-$x$ behaviour using the LHC data on the $t \bar t$
production at $\sqrt s = 13$ TeV. Then, we apply the
Catani-Ciafaloni-Fiorani-Marchesini (CCFM) evolution equation to extend the
obtained TMD gluon density to the whole kinematical region. In addition, the
complementary TMD valence and sea quark distributions are generated. The latter
are evaluated in the approximation where the gluon-to-quark splitting occurs at
the last evolution step using the TMD gluon-to-quark splitting function.
Several phenomenological applications of the proposed TMD quark and gluon
densities to the LHC processes are discussed.
|
[
{
"created": "Mon, 18 Jun 2018 14:41:29 GMT",
"version": "v1"
}
] |
2018-09-19
|
[
[
"Abdulov",
"N. A.",
""
],
[
"Jung",
"H.",
""
],
[
"Lipatov",
"A. V.",
""
],
[
"Lykasov",
"G. I.",
""
],
[
"Malyshev",
"M. A.",
""
]
] |
Transverse momentum dependent (TMD) parton distributions in a proton are important in high energy physics from both theoretical and phenomenological points of view. Using the latest RHIC and LHC data on the inclusive soft hadron production in $pp$ and $AA$ collisions at small transverse momenta, we determine the parameters of the initial TMD gluon density, derived in the framework of quark-gluon string model at the low scale $\mu_0 \sim 1 - 2$ GeV and refine its large-$x$ behaviour using the LHC data on the $t \bar t$ production at $\sqrt s = 13$ TeV. Then, we apply the Catani-Ciafaloni-Fiorani-Marchesini (CCFM) evolution equation to extend the obtained TMD gluon density to the whole kinematical region. In addition, the complementary TMD valence and sea quark distributions are generated. The latter are evaluated in the approximation where the gluon-to-quark splitting occurs at the last evolution step using the TMD gluon-to-quark splitting function. Several phenomenological applications of the proposed TMD quark and gluon densities to the LHC processes are discussed.
|
hep-ph/0508137
|
Fabiana Carvalho
|
F. Carvalho, F.O. Dur\~aes, F.S. Navarra and M. Nielsen
|
Hadronic form factors and the $J/\psi$ secondary production cross
section: an update
|
12 pages, 9 eps figures
|
Phys.Rev. C72 (2005) 024902
|
10.1103/PhysRevC.72.024902
| null |
hep-ph
| null |
Improving previous calculations, we compute the $D + \bar{D} \to J/\psi + \pi
$ cross section using the most complete effective lagrangians available. The
new crucial ingredients are the form factors on the charm meson vertices, which
are determined from QCD sum rules calculations. Some of them became available
only very recently and the last one, needed for our present purpose, is
calculated in this work.
|
[
{
"created": "Thu, 11 Aug 2005 18:00:29 GMT",
"version": "v1"
},
{
"created": "Thu, 11 Aug 2005 20:20:13 GMT",
"version": "v2"
}
] |
2009-11-11
|
[
[
"Carvalho",
"F.",
""
],
[
"Durães",
"F. O.",
""
],
[
"Navarra",
"F. S.",
""
],
[
"Nielsen",
"M.",
""
]
] |
Improving previous calculations, we compute the $D + \bar{D} \to J/\psi + \pi $ cross section using the most complete effective lagrangians available. The new crucial ingredients are the form factors on the charm meson vertices, which are determined from QCD sum rules calculations. Some of them became available only very recently and the last one, needed for our present purpose, is calculated in this work.
|
1404.1918
|
Gabriel Shaughnessy
|
M. A. Gomez, C. B. Jackson and G. Shaughnessy
|
Dark Matter on Top
|
26 pages, 13 figures. v2: included additional elastic scattering
processes
| null |
10.1088/1475-7516/2014/12/025
| null |
hep-ph astro-ph.HE
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We consider a simplified model of fermionic dark matter which couples
exclusively to the right-handed top quark via a renormalizable interaction with
a color-charged scalar. We first compute the relic abundance of this type of
dark matter and investigate constraints placed on the model parameter space by
the latest direct detection data. We also perform a detailed analysis for the
production of dark matter at the LHC for this model. We find several kinematic
variables that allow for a clean signal extraction and we show that the
parameter space of this model will be well probed during LHC Run-II. Finally,
we investigate the possibility of detecting this type of dark matter via its
annihilations into gamma rays. We compute the continuum and the line emission
(which includes a possible "Higgs in Space" line) and its possible discovery by
future gamma-ray telescopes. We find that the annihilation spectrum has
distinctive features which may distinguish it from other models.
|
[
{
"created": "Mon, 7 Apr 2014 20:00:01 GMT",
"version": "v1"
},
{
"created": "Fri, 16 May 2014 16:58:18 GMT",
"version": "v2"
}
] |
2015-06-19
|
[
[
"Gomez",
"M. A.",
""
],
[
"Jackson",
"C. B.",
""
],
[
"Shaughnessy",
"G.",
""
]
] |
We consider a simplified model of fermionic dark matter which couples exclusively to the right-handed top quark via a renormalizable interaction with a color-charged scalar. We first compute the relic abundance of this type of dark matter and investigate constraints placed on the model parameter space by the latest direct detection data. We also perform a detailed analysis for the production of dark matter at the LHC for this model. We find several kinematic variables that allow for a clean signal extraction and we show that the parameter space of this model will be well probed during LHC Run-II. Finally, we investigate the possibility of detecting this type of dark matter via its annihilations into gamma rays. We compute the continuum and the line emission (which includes a possible "Higgs in Space" line) and its possible discovery by future gamma-ray telescopes. We find that the annihilation spectrum has distinctive features which may distinguish it from other models.
|
2405.08863
|
Joseph Tooby-Smith
|
Joseph Tooby-Smith
|
HepLean: Digitalising high energy physics
|
16 pages. Comments are welcome
| null | null | null |
hep-ph cs.LO hep-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We introduce HepLean, an open-source project to digitalise definitions,
theorems, proofs, and calculations in high energy physics using the interactive
theorem prover Lean 4. HepLean has the potential to benefit the high energy
physics community in four ways: making it easier to find existing results,
allowing the creation of new results using artificial intelligence and
automated methods, allowing easy review of papers for mathematical correctness,
and providing new ways to teach high energy physics. We will discuss these in
detail. We will also demonstrate the digitalisation of three areas of high
energy physics in HepLean: Cabibbo-Kobayashi-Maskawa matrices in flavour
physics, local anomaly cancellation, and Higgs physics.
|
[
{
"created": "Tue, 14 May 2024 18:00:01 GMT",
"version": "v1"
}
] |
2024-05-16
|
[
[
"Tooby-Smith",
"Joseph",
""
]
] |
We introduce HepLean, an open-source project to digitalise definitions, theorems, proofs, and calculations in high energy physics using the interactive theorem prover Lean 4. HepLean has the potential to benefit the high energy physics community in four ways: making it easier to find existing results, allowing the creation of new results using artificial intelligence and automated methods, allowing easy review of papers for mathematical correctness, and providing new ways to teach high energy physics. We will discuss these in detail. We will also demonstrate the digitalisation of three areas of high energy physics in HepLean: Cabibbo-Kobayashi-Maskawa matrices in flavour physics, local anomaly cancellation, and Higgs physics.
|
hep-ph/9807272
|
Jes Madsen
|
Gregers Neergaard and Jes Madsen
|
Free energy of bubbles and droplets in the quark-hadron phase transition
|
Published version, 25 pages including 16 figures
|
Phys.Rev. D60 (1999) 054011
|
10.1103/PhysRevD.60.054011
| null |
hep-ph astro-ph nucl-th
| null |
Using the MIT bag model, we calculate the free energy of droplets of
quark-gluon plasma in a bulk hadronic medium, and of hadronic bubbles in a bulk
quark-gluon plasma, under the assumption of vanishing chemical potentials. We
investigate the validity of the multiple reflection expansion approximation,
and we advise a novel procedure for calculating finite-size corrections to the
free energy of hadronic bubbles in a bulk quark-gluon plasma. While our results
agree largely with earlier calculations, we show that the usual multiple
reflection expansion should be used with caution, and we propose a modification
of the multiple reflection expansion, which makes this approximation agree
nicely with direct numerical calculations. The results should be of relevance
in connection with the cosmological quark-hadron transition as well as for
ultrarelativistic heavy ion collisions.
|
[
{
"created": "Tue, 7 Jul 1998 12:39:50 GMT",
"version": "v1"
},
{
"created": "Wed, 21 Oct 1998 21:41:30 GMT",
"version": "v2"
},
{
"created": "Mon, 2 Aug 1999 11:28:27 GMT",
"version": "v3"
}
] |
2009-10-31
|
[
[
"Neergaard",
"Gregers",
""
],
[
"Madsen",
"Jes",
""
]
] |
Using the MIT bag model, we calculate the free energy of droplets of quark-gluon plasma in a bulk hadronic medium, and of hadronic bubbles in a bulk quark-gluon plasma, under the assumption of vanishing chemical potentials. We investigate the validity of the multiple reflection expansion approximation, and we advise a novel procedure for calculating finite-size corrections to the free energy of hadronic bubbles in a bulk quark-gluon plasma. While our results agree largely with earlier calculations, we show that the usual multiple reflection expansion should be used with caution, and we propose a modification of the multiple reflection expansion, which makes this approximation agree nicely with direct numerical calculations. The results should be of relevance in connection with the cosmological quark-hadron transition as well as for ultrarelativistic heavy ion collisions.
|
0906.5512
|
Bernard Pire
|
B. Pire, F. Schwennsen, L. Szymanowski, and S. Wallon
|
Pomeron Odderon interference in production of pi+ pi- pairs at LHC
|
5 pages, 5 figures, to be published in the proceedings of the
conference DIS 2009, Madrid, April 2009
| null | null |
CPHT-PC056.0609, LPT-ORSAY 09-48
|
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We discuss the production of two pion pairs in photon collisions at high
energies as it can take place in ultraperipheral collisions at hadron colliders
such as the LHC. We calculate the according matrix elements in kT factorization
and discuss the possibility to reveal the existence of the perturbative Odderon
by charge asymmetries.
|
[
{
"created": "Tue, 30 Jun 2009 14:59:35 GMT",
"version": "v1"
}
] |
2009-07-01
|
[
[
"Pire",
"B.",
""
],
[
"Schwennsen",
"F.",
""
],
[
"Szymanowski",
"L.",
""
],
[
"Wallon",
"S.",
""
]
] |
We discuss the production of two pion pairs in photon collisions at high energies as it can take place in ultraperipheral collisions at hadron colliders such as the LHC. We calculate the according matrix elements in kT factorization and discuss the possibility to reveal the existence of the perturbative Odderon by charge asymmetries.
|
1802.00544
|
Wen-Ge Wang
|
Wen-ge Wang
|
Neutrino-mass differences studied in a model with one basic neutrino
|
11 pages, 0 figure. More discussions have been added for properties
of neutrinos in the proposed model
| null | null | null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
In this paper, we propose and study a model, in which there exists only one
basic neutrino. Basically, the Lagrangian of the model is obtained from the
Lagrangian in the Glashow-Weinberg-Salam electroweak theory by reducing the
three flavor neutrinos there to one basic neutrino. In this model, neutrino
states with a fixed flavor are interpreted as certain superpositions of states
of the basic neutrino and states of the related charged lepton. Neutrino mass
states are associated with low-lying eigenstates of the total Hamiltonian. We
derive an approximate expression for a ratio of neutrino-mass differences,
which gives a value $17$ for the ratio, about half of the experimental result
of $33$.
|
[
{
"created": "Fri, 2 Feb 2018 02:46:26 GMT",
"version": "v1"
},
{
"created": "Fri, 9 Mar 2018 13:23:28 GMT",
"version": "v2"
},
{
"created": "Sun, 10 Jun 2018 07:07:52 GMT",
"version": "v3"
}
] |
2018-06-12
|
[
[
"Wang",
"Wen-ge",
""
]
] |
In this paper, we propose and study a model, in which there exists only one basic neutrino. Basically, the Lagrangian of the model is obtained from the Lagrangian in the Glashow-Weinberg-Salam electroweak theory by reducing the three flavor neutrinos there to one basic neutrino. In this model, neutrino states with a fixed flavor are interpreted as certain superpositions of states of the basic neutrino and states of the related charged lepton. Neutrino mass states are associated with low-lying eigenstates of the total Hamiltonian. We derive an approximate expression for a ratio of neutrino-mass differences, which gives a value $17$ for the ratio, about half of the experimental result of $33$.
|
hep-ph/9809414
|
Peter Petreczky
|
F. Karsch, M. Oevers, A. Patkos, P. Petreczky, Zs. Szep
|
QCD thermodynamics from 3d adjoint Higgs model
|
Talk given at the 5th International Workshop on Thermal Field Theory
and their Applications, Regensburg (Germany), August 1998, corrected typos
| null | null |
BI-TP 98/26
|
hep-ph
| null |
The screening masses of hot SU(N) gauge theory, defined as poles of the
corresponding propagators are studied in 3d adjoint Higgs model, considered as
an effective theory of QCD, using coupled gap equations and lattice Monte-Carlo
simulations (for N=2). Using so-called lambda gauges non-perturbative evidence
for gauge independence of the pole masses within this class of gauges is given.
A possible application of the screening masses for the resummation of the free
energy is discussed.
|
[
{
"created": "Wed, 16 Sep 1998 17:27:02 GMT",
"version": "v1"
},
{
"created": "Fri, 30 Oct 1998 17:28:38 GMT",
"version": "v2"
}
] |
2007-05-23
|
[
[
"Karsch",
"F.",
""
],
[
"Oevers",
"M.",
""
],
[
"Patkos",
"A.",
""
],
[
"Petreczky",
"P.",
""
],
[
"Szep",
"Zs.",
""
]
] |
The screening masses of hot SU(N) gauge theory, defined as poles of the corresponding propagators are studied in 3d adjoint Higgs model, considered as an effective theory of QCD, using coupled gap equations and lattice Monte-Carlo simulations (for N=2). Using so-called lambda gauges non-perturbative evidence for gauge independence of the pole masses within this class of gauges is given. A possible application of the screening masses for the resummation of the free energy is discussed.
|
1512.03123
|
Wei Wang
|
Wei Wang, Qiang Zhao
|
Decipher the short-distance component of $X(3872)$ in $B_c$ decays
|
7 pages, 1 figure
| null |
10.1016/j.physletb.2016.02.012
| null |
hep-ph hep-ex
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
A foremost task in understanding the nature of the $X(3872)$ involves the
discrimination of the two-quark and multiquark configurations. In this work, we
propose a method to probe the short-distance component of the $X(3872)$ by
measuring the ratio between the $B_c$ semileptonic and nonleptonic decays into
the $X(3872)$. We demonstrate that if the $X(3872)$ production mechanism is
through the $\bar cc$ component, the ratios would be universal and could be
reliably predicted in theory. Measurements of these ratios at LHC and the
next-generation electron-positron colliders are capable of
validating/invalidating this production mechanism and providing deeper insights
into the nature of the $X(3872)$.
|
[
{
"created": "Thu, 10 Dec 2015 01:40:23 GMT",
"version": "v1"
}
] |
2016-03-23
|
[
[
"Wang",
"Wei",
""
],
[
"Zhao",
"Qiang",
""
]
] |
A foremost task in understanding the nature of the $X(3872)$ involves the discrimination of the two-quark and multiquark configurations. In this work, we propose a method to probe the short-distance component of the $X(3872)$ by measuring the ratio between the $B_c$ semileptonic and nonleptonic decays into the $X(3872)$. We demonstrate that if the $X(3872)$ production mechanism is through the $\bar cc$ component, the ratios would be universal and could be reliably predicted in theory. Measurements of these ratios at LHC and the next-generation electron-positron colliders are capable of validating/invalidating this production mechanism and providing deeper insights into the nature of the $X(3872)$.
|
hep-ph/0411218
|
Loiseau Benoit
|
B. Loiseau, S. Wycech
|
Antiproton-proton resonant like channels in J/Psi decays into photon,
proton and antiproton
|
Invited talk at the 10th International Symposium on Meson-Nucleon
Physics and the Structure of the Nucleon (MENU 2004), Beijing, China, August
29 - September 4, 2004 - 4 pages, 2 figures
|
Int.J.Mod.Phys. A20 (2005) 1990-1993
|
10.1142/S0217751X05023803
|
LPNHE 2004-12
|
hep-ph
| null |
The BES collaboration has recently observed a strong enhancement close to the
proton-antiproton threshold in the J/Psi decays into photon, proton and
antiproton. Such a structure can be explained by a traditional
nucleon-antinucleon model. The near threshold 1S0 bound state and/or the
well-established 3P0 resonant state found in this nucleon-antinucleon
interaction can adequately describe the BES data.
|
[
{
"created": "Tue, 16 Nov 2004 22:11:28 GMT",
"version": "v1"
}
] |
2009-11-10
|
[
[
"Loiseau",
"B.",
""
],
[
"Wycech",
"S.",
""
]
] |
The BES collaboration has recently observed a strong enhancement close to the proton-antiproton threshold in the J/Psi decays into photon, proton and antiproton. Such a structure can be explained by a traditional nucleon-antinucleon model. The near threshold 1S0 bound state and/or the well-established 3P0 resonant state found in this nucleon-antinucleon interaction can adequately describe the BES data.
|
hep-ph/9505253
| null |
Gia Dvali
|
REMOVING THE COSMOLOGICAL BOUND ON THE AXION SCALE
|
Latex, 14 pages
| null | null |
IFUP-TH 21/95
|
hep-ph astro-ph
| null |
The current cosmological bound on the invisible axion scale may be avoided in
the class of theories in which the gauge coupling constant is determined
through the expectation value of some scalar field (e.g. moduli in supergravity
and string theories). This leads to the cosmological scenario different from
that of the standard invisible axion, since the initial values of the fields
are usually far away from their true minima, allowing for the color group
becoming strong in the very early universe and fixing the axion field to its
minimum. The effect disappears as soon as scalar field adjusts to its present
value, but the above is enough to ensure that the deviation of the axion
expectation value from the minimum is negligible at the moment of the QCD phase
transition and thus to eliminate the troublesome coherent oscillations. This
may imply that the standard axion window does not necessarily hold in generic
supergravity theories. The above observation may open a natural possibility for
the existence of the axion resulting from the GUT or R-symmetry breaking.
|
[
{
"created": "Mon, 8 May 1995 15:17:11 GMT",
"version": "v1"
}
] |
2007-05-23
|
[
[
"Dvali",
"Gia",
""
]
] |
The current cosmological bound on the invisible axion scale may be avoided in the class of theories in which the gauge coupling constant is determined through the expectation value of some scalar field (e.g. moduli in supergravity and string theories). This leads to the cosmological scenario different from that of the standard invisible axion, since the initial values of the fields are usually far away from their true minima, allowing for the color group becoming strong in the very early universe and fixing the axion field to its minimum. The effect disappears as soon as scalar field adjusts to its present value, but the above is enough to ensure that the deviation of the axion expectation value from the minimum is negligible at the moment of the QCD phase transition and thus to eliminate the troublesome coherent oscillations. This may imply that the standard axion window does not necessarily hold in generic supergravity theories. The above observation may open a natural possibility for the existence of the axion resulting from the GUT or R-symmetry breaking.
|
1310.2164
|
Adam Burrows
|
Yunfan Zhang (Princeton University & Scripps Institution of
Oceanography) and Adam Burrows (Princeton University)
|
Transport Equations for Oscillating Neutrinos
|
13 pages; Submitted to Physical Review D
| null |
10.1103/PhysRevD.88.105009
| null |
hep-ph nucl-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We derive a suite of generalized Boltzmann equations, based on the
density-matrix formalism, that incorporates the physics of neutrino
oscillations for two- and three-flavor oscillations, matter refraction, and
self-refraction. The resulting equations are straightforward extensions of the
classical transport equations that nevertheless contain the full physics of
quantum oscillation phenomena. In this way, our broadened formalism provides a
bridge between the familiar neutrino transport algorithms employed by supernova
modelers and the more quantum-heavy approaches frequently employed to
illuminate the various neutrino oscillation effects. We also provide the
corresponding angular-moment versions of this generalized equation set. Our
goal is to make it easier for astrophysicists to address oscillation phenomena
in a language with which they are familiar. The equations we derive are simple
and practical, and are intended to facilitate progress concerning oscillation
phenomena in the context of core-collapse supernova theory.
|
[
{
"created": "Tue, 8 Oct 2013 14:57:32 GMT",
"version": "v1"
}
] |
2015-06-17
|
[
[
"Zhang",
"Yunfan",
"",
"Princeton University & Scripps Institution of\n Oceanography"
],
[
"Burrows",
"Adam",
"",
"Princeton University"
]
] |
We derive a suite of generalized Boltzmann equations, based on the density-matrix formalism, that incorporates the physics of neutrino oscillations for two- and three-flavor oscillations, matter refraction, and self-refraction. The resulting equations are straightforward extensions of the classical transport equations that nevertheless contain the full physics of quantum oscillation phenomena. In this way, our broadened formalism provides a bridge between the familiar neutrino transport algorithms employed by supernova modelers and the more quantum-heavy approaches frequently employed to illuminate the various neutrino oscillation effects. We also provide the corresponding angular-moment versions of this generalized equation set. Our goal is to make it easier for astrophysicists to address oscillation phenomena in a language with which they are familiar. The equations we derive are simple and practical, and are intended to facilitate progress concerning oscillation phenomena in the context of core-collapse supernova theory.
|
1910.00717
|
Roman Pasechnik
|
Ant\'onio P. Morais and Roman Pasechnik
|
Probing multi-step electroweak phase transition with multi-peaked
primordial gravitational waves spectra
|
33 pages, 7 figures; references added; discussion of the results
updated; published version
| null |
10.1088/1475-7516/2020/04/036
| null |
hep-ph astro-ph.CO gr-qc hep-ex
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Multi-peaked spectra of the primordial gravitational waves are considered as
a phenomenologically relevant source of information about the dynamics of
sequential phase transitions in the early Universe. In particular, such
signatures trace back to specific patterns of the first-order electroweak phase
transition in the early Universe occurring in multiple steps. Such phenomena
appear to be rather generic in multi-scalar extensions of the Standard Model.
In a particularly simple extension of the Higgs sector, we have identified and
studied the emergence of sequential long- and short-lasting transitions as well
as their fundamental role in generation of multi-peaked structures in the
primordial gravitational-wave spectrum. We discuss the potential detectability
of these signatures by the proposed gravitational-wave interferometers.
|
[
{
"created": "Tue, 1 Oct 2019 23:45:43 GMT",
"version": "v1"
},
{
"created": "Sun, 20 Oct 2019 12:28:26 GMT",
"version": "v2"
},
{
"created": "Tue, 28 Apr 2020 07:57:35 GMT",
"version": "v3"
}
] |
2020-04-29
|
[
[
"Morais",
"António P.",
""
],
[
"Pasechnik",
"Roman",
""
]
] |
Multi-peaked spectra of the primordial gravitational waves are considered as a phenomenologically relevant source of information about the dynamics of sequential phase transitions in the early Universe. In particular, such signatures trace back to specific patterns of the first-order electroweak phase transition in the early Universe occurring in multiple steps. Such phenomena appear to be rather generic in multi-scalar extensions of the Standard Model. In a particularly simple extension of the Higgs sector, we have identified and studied the emergence of sequential long- and short-lasting transitions as well as their fundamental role in generation of multi-peaked structures in the primordial gravitational-wave spectrum. We discuss the potential detectability of these signatures by the proposed gravitational-wave interferometers.
|
0807.1951
|
Tuan Do quoc
|
Do Quoc Tuan
|
Phenomenological models of baryon
|
36 pages, 7 figures
| null | null | null |
hep-ph nucl-th
|
http://creativecommons.org/licenses/by/3.0/
|
In this paper, I present almost my works performed during my time at VNU. I
was interested in the composite Skyrme model proposed by H. Y. Cheung and F.
Gursey. The expanding for this model based on results obtained from the
original Skyrme model given by T. H. R. Skyrme in 1961 was general and
interesting.
|
[
{
"created": "Sat, 12 Jul 2008 03:10:05 GMT",
"version": "v1"
}
] |
2008-07-16
|
[
[
"Tuan",
"Do Quoc",
""
]
] |
In this paper, I present almost my works performed during my time at VNU. I was interested in the composite Skyrme model proposed by H. Y. Cheung and F. Gursey. The expanding for this model based on results obtained from the original Skyrme model given by T. H. R. Skyrme in 1961 was general and interesting.
|
1212.3808
|
P. S. Bhupal Dev
|
P. S. Bhupal Dev and Apostolos Pilaftsis
|
Light and Superlight Sterile Neutrinos in the Minimal Radiative Inverse
Seesaw Model
|
16 pages, 8 figures; version accepted for publication in Phys. Rev. D
|
Phys. Rev. D87 (2013) 053007
|
10.1103/PhysRevD.87.053007
|
MAN/HEP/2012/020
|
hep-ph astro-ph.CO hep-ex
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We explore the possibility of light and superlight sterile neutrinos in the
recently proposed Minimal Radiative Inverse Seesaw extension of the Standard
Model for neutrino masses, in which all existing neutrino data can be
explained. In particular, we discuss two benchmark scenarios with one of the
three sterile neutrino states in the keV-range, having very small mixing with
the active neutrinos to account for the Dark Matter in the Universe, while (i)
the other two light sterile neutrino states could be in the eV-range,
possessing a nonzero mixing with the active states as required to explain the
LSND+MiniBooNE+reactor neutrino data, or (ii) one of the light sterile states
is in the eV-range, whereas the second one could be superlight and almost
mass-degenerate with the solar neutrinos. Such superlight sterile neutrinos
could give rise to potentially observable effects in future neutrino
oscillation experiments and may also offer a possible explanation for the extra
radiation observed in the Universe.
|
[
{
"created": "Sun, 16 Dec 2012 17:36:04 GMT",
"version": "v1"
},
{
"created": "Sat, 2 Mar 2013 06:37:37 GMT",
"version": "v2"
}
] |
2013-08-01
|
[
[
"Dev",
"P. S. Bhupal",
""
],
[
"Pilaftsis",
"Apostolos",
""
]
] |
We explore the possibility of light and superlight sterile neutrinos in the recently proposed Minimal Radiative Inverse Seesaw extension of the Standard Model for neutrino masses, in which all existing neutrino data can be explained. In particular, we discuss two benchmark scenarios with one of the three sterile neutrino states in the keV-range, having very small mixing with the active neutrinos to account for the Dark Matter in the Universe, while (i) the other two light sterile neutrino states could be in the eV-range, possessing a nonzero mixing with the active states as required to explain the LSND+MiniBooNE+reactor neutrino data, or (ii) one of the light sterile states is in the eV-range, whereas the second one could be superlight and almost mass-degenerate with the solar neutrinos. Such superlight sterile neutrinos could give rise to potentially observable effects in future neutrino oscillation experiments and may also offer a possible explanation for the extra radiation observed in the Universe.
|
1302.4651
|
David M. Straub
|
David M. Straub
|
Anatomy of flavour-changing Z couplings in models with partial
compositeness
|
22 pages, 4 figures. v2: minor clarifications, conclusions unchanged.
Matches journal version
| null |
10.1007/JHEP08(2013)108
|
MITP/13-014
|
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
In models with partially composite quarks, the couplings of quarks to the Z
boson generically receive non-universal corrections that are not only
constrained by electroweak precision tests but also lead to flavour-changing
neutral currents at tree level. The impact of these flavour-changing couplings
on rare K and B decays is studied in two-site models for three scenarios: an
anarchic strong sector with two different choices of fermion representations
both leading to a custodial protection of the Z->bb coupling, and for a strong
sector invariant under a U(2)^3 flavour symmetry. In the complete numerical
analysis, all relevant constraints from Delta(F)=2 processes are taken into
account. In all scenarios, visible effects in rare K and B decays like K->pi nu
anti-nu, B(s)->mu+mu- and B->K*mu+mu- are possible that can be scrutinized
experimentally in the near future. Characteristic correlations between
observables allow to distinguish the different cases. To sample the large
parameter space of the anarchic models, a new method is presented that allows
larger statistics than conventional approaches.
|
[
{
"created": "Tue, 19 Feb 2013 15:55:24 GMT",
"version": "v1"
},
{
"created": "Thu, 8 Aug 2013 10:07:07 GMT",
"version": "v2"
}
] |
2015-06-15
|
[
[
"Straub",
"David M.",
""
]
] |
In models with partially composite quarks, the couplings of quarks to the Z boson generically receive non-universal corrections that are not only constrained by electroweak precision tests but also lead to flavour-changing neutral currents at tree level. The impact of these flavour-changing couplings on rare K and B decays is studied in two-site models for three scenarios: an anarchic strong sector with two different choices of fermion representations both leading to a custodial protection of the Z->bb coupling, and for a strong sector invariant under a U(2)^3 flavour symmetry. In the complete numerical analysis, all relevant constraints from Delta(F)=2 processes are taken into account. In all scenarios, visible effects in rare K and B decays like K->pi nu anti-nu, B(s)->mu+mu- and B->K*mu+mu- are possible that can be scrutinized experimentally in the near future. Characteristic correlations between observables allow to distinguish the different cases. To sample the large parameter space of the anarchic models, a new method is presented that allows larger statistics than conventional approaches.
|
1804.04989
|
Paolo Castorina
|
P. Castorina, D. Lanteri and S. Mancani
|
Deconfinement Transition Effects on Cosmological Parameters and
Primordial Gravitational Wave Spectrum
|
13 pages,13 figures
|
Phys. Rev. D 98, 023007 (2018)
|
10.1103/PhysRevD.98.023007
| null |
hep-ph astro-ph.HE nucl-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
The cosmological evolution can be described in terms of directly measurable
cosmological scalar parameters (deceleration $q$, jerk $j$, snap $s$, etc...)
constructed out of high order derivatives of the scale factor. Their behavior
at the critical temperature of the Quantum Chromodynamics (QCD) phase
transition in early universe could be a specific tool to study the transition,
analogously to the fluctuations of conserved charges in QCD. We analyze the
effect of the crossover transition from quarks and gluons to hadrons in early
universe on the cosmological scalars and on the gravitational wave spectrum, by
using the recent lattice QCD equation of state and including the electroweak
degrees of freedom and different models of dark matter. Near the transition the
cosmological parameters follow the behavior of QCD trace anomaly and of the
speed of sound of the entire system. The effects of deconfinement turn out to
be more relevant for the modification of the primordial spectrum of
gravitational waves and our complete analysis, based on lattice QCD simulations
and on the hadron resonance gas below the critical temperature, refines
previous results.
|
[
{
"created": "Fri, 13 Apr 2018 15:21:55 GMT",
"version": "v1"
}
] |
2018-07-18
|
[
[
"Castorina",
"P.",
""
],
[
"Lanteri",
"D.",
""
],
[
"Mancani",
"S.",
""
]
] |
The cosmological evolution can be described in terms of directly measurable cosmological scalar parameters (deceleration $q$, jerk $j$, snap $s$, etc...) constructed out of high order derivatives of the scale factor. Their behavior at the critical temperature of the Quantum Chromodynamics (QCD) phase transition in early universe could be a specific tool to study the transition, analogously to the fluctuations of conserved charges in QCD. We analyze the effect of the crossover transition from quarks and gluons to hadrons in early universe on the cosmological scalars and on the gravitational wave spectrum, by using the recent lattice QCD equation of state and including the electroweak degrees of freedom and different models of dark matter. Near the transition the cosmological parameters follow the behavior of QCD trace anomaly and of the speed of sound of the entire system. The effects of deconfinement turn out to be more relevant for the modification of the primordial spectrum of gravitational waves and our complete analysis, based on lattice QCD simulations and on the hadron resonance gas below the critical temperature, refines previous results.
|
hep-ph/0306249
|
Luis Roca
|
J.E.Palomar, L.Roca, E.Oset, M.J.Vicente Vacas
|
Sequential vector and axial-vector meson exchange and chiral loops in
radiative phi decay
|
28 pages, 20 figures
|
Nucl.Phys.A729:743-768,2003
|
10.1016/j.nuclphysa.2003.10.003
| null |
hep-ph
| null |
We study the radiative $\phi$ decay into $\pi^0 \pi^0 \gamma$ and $\pi^0 \eta
\gamma $ taking into account mechanisms in which there are two sequential
vector-vector-pseudoscalar or axial-vector--vector--pseudoscalar steps followed
by the coupling of a vector meson to the photon, considering the final state
interaction of the two mesons. There are other mechanisms in which two kaons
are produced through the same sequential mechanisms or from $\phi$ decay into
two kaons and then undergo final state interaction leading to the final pair of
pions or $\pi^0 \eta$, this latter mechanism being the leading one. The results
of the parameter free theory, together with the theoretical uncertainties, are
compared with the latest experimental results of KLOE at Frascati.
|
[
{
"created": "Wed, 25 Jun 2003 11:27:40 GMT",
"version": "v1"
}
] |
2008-11-26
|
[
[
"Palomar",
"J. E.",
""
],
[
"Roca",
"L.",
""
],
[
"Oset",
"E.",
""
],
[
"Vacas",
"M. J. Vicente",
""
]
] |
We study the radiative $\phi$ decay into $\pi^0 \pi^0 \gamma$ and $\pi^0 \eta \gamma $ taking into account mechanisms in which there are two sequential vector-vector-pseudoscalar or axial-vector--vector--pseudoscalar steps followed by the coupling of a vector meson to the photon, considering the final state interaction of the two mesons. There are other mechanisms in which two kaons are produced through the same sequential mechanisms or from $\phi$ decay into two kaons and then undergo final state interaction leading to the final pair of pions or $\pi^0 \eta$, this latter mechanism being the leading one. The results of the parameter free theory, together with the theoretical uncertainties, are compared with the latest experimental results of KLOE at Frascati.
|
1106.5155
|
Alejandro Ayala
|
Alejandro Ayala, Adnan Bashir, C. A. Dominguez, Enif Gutierrez, M.
Loewe and Alfredo Raya
|
QCD phase diagram from finite energy sum rules
|
7 pages, 5 figures
| null |
10.1103/PhysRevD.84.056004
| null |
hep-ph nucl-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We study the QCD phase diagram at finite temperature and baryon chemical
potential by relating the behavior of the light-quark condensate to the
threshold energy for the onset of perturbative QCD. These parameters are
connected to the chiral symmetry restoration and the deconfinement phase
transition, respectively. This relation is obtained in the framework of finite
energy QCD sum rules at finite temperature and density, with input from
Schwinger-Dyson methods to determine the light-quark condensate. Results
indicate that both critical temperatures are basically the same within some 3%
accuracy. We also obtain bounds for the position of the critical end point,
mu_{B c} >~ 300 MeV and T_c <~ 185 MeV.
|
[
{
"created": "Sat, 25 Jun 2011 18:06:30 GMT",
"version": "v1"
}
] |
2015-05-28
|
[
[
"Ayala",
"Alejandro",
""
],
[
"Bashir",
"Adnan",
""
],
[
"Dominguez",
"C. A.",
""
],
[
"Gutierrez",
"Enif",
""
],
[
"Loewe",
"M.",
""
],
[
"Raya",
"Alfredo",
""
]
] |
We study the QCD phase diagram at finite temperature and baryon chemical potential by relating the behavior of the light-quark condensate to the threshold energy for the onset of perturbative QCD. These parameters are connected to the chiral symmetry restoration and the deconfinement phase transition, respectively. This relation is obtained in the framework of finite energy QCD sum rules at finite temperature and density, with input from Schwinger-Dyson methods to determine the light-quark condensate. Results indicate that both critical temperatures are basically the same within some 3% accuracy. We also obtain bounds for the position of the critical end point, mu_{B c} >~ 300 MeV and T_c <~ 185 MeV.
|
hep-ph/9905299
|
Bodo Geyer
|
B. Geyer, M. Lazar and D. Robaschik
|
Construction of nonlocal light-cone operators with definite twist
|
4 pages, AMSTeX, Contribution to 7th Int. Workshop on Deep Inelastic
Scatterin and QCD, Zeuthen, April 1999 change of formulas 25 and 26
|
Nucl.Phys.Proc.Suppl. 79 (1999) 560-563
|
10.1016/S0920-5632(99)00783-5
| null |
hep-ph
| null |
A systematic procedure is introduced to uniquely decompose nonlocal
LC-operators into harmonic operators of well defined geometric twist. The
method will be demonstrated for (pseudo)scalar, (axial) vector and skew tensor
bilocal quark light-ray operators
|
[
{
"created": "Tue, 11 May 1999 09:48:53 GMT",
"version": "v1"
},
{
"created": "Thu, 27 May 1999 12:16:58 GMT",
"version": "v2"
},
{
"created": "Mon, 14 Jun 1999 10:14:28 GMT",
"version": "v3"
}
] |
2009-10-31
|
[
[
"Geyer",
"B.",
""
],
[
"Lazar",
"M.",
""
],
[
"Robaschik",
"D.",
""
]
] |
A systematic procedure is introduced to uniquely decompose nonlocal LC-operators into harmonic operators of well defined geometric twist. The method will be demonstrated for (pseudo)scalar, (axial) vector and skew tensor bilocal quark light-ray operators
|
hep-ph/9502411
|
Kuang-Ta Chao
|
J.Tang, J.H.Liu, and K.T.Chao
|
Hadronic matrix elements and radiative $B\to K^{*}\gamma$ decay
|
17 pages in Latex
|
Phys.Rev. D51 (1995) 3501-3509
|
10.1103/PhysRevD.51.3501
|
PUTP-94-06 (revised),to appear in Phys.Rev.D.
|
hep-ph
| null |
Within the standard model, we calculate the radiative $B\rightarrow
K^{\star}\gamma$ decay rate based on a Bethe-Salpeter description for the meson
wave functions and the hadronic matrix elements. With a reasonable choice of
parameters the branching ratio BR($B \rightarrow K^{\star}\gamma$) is found to
be $(3.8-4.6)\times 10^{-5}$, which is in agreement with the CLEO experimental
data. We also find with $m_{b}=5.12 GeV$ the ratio $R\equiv {\Gamma
(B\rightarrow K^{\star}\gamma )}/{\Gamma (b\rightarrow s\gamma )}=(10-12)\%$,
which can be slightly larger if a smaller $m_{b}$ is chosen. In this approach,
the light degrees of freedom in mesons are treated as light constituent quarks
with relativistic kinematics, and the form factors in the decay amplitude are
essentially determined by the relativistic kenematics and the overlap of wave
functions of the initial and final state mesons. Due to the large recoil
momentum of the $K^{\star}$ meson at the $B$ meson rest frame, the form factors
are sensitive to the overlap integral of the meson wave functions, which are
determined dynamically by a QCD-motivated inter-quark potential. Relativistic
effects on the meson wave functions mainly due to the Breit-Fermi interactions
are found to be significant in determining the decay rate.
|
[
{
"created": "Tue, 28 Feb 1995 09:02:24 GMT",
"version": "v1"
}
] |
2016-09-01
|
[
[
"Tang",
"J.",
""
],
[
"Liu",
"J. H.",
""
],
[
"Chao",
"K. T.",
""
]
] |
Within the standard model, we calculate the radiative $B\rightarrow K^{\star}\gamma$ decay rate based on a Bethe-Salpeter description for the meson wave functions and the hadronic matrix elements. With a reasonable choice of parameters the branching ratio BR($B \rightarrow K^{\star}\gamma$) is found to be $(3.8-4.6)\times 10^{-5}$, which is in agreement with the CLEO experimental data. We also find with $m_{b}=5.12 GeV$ the ratio $R\equiv {\Gamma (B\rightarrow K^{\star}\gamma )}/{\Gamma (b\rightarrow s\gamma )}=(10-12)\%$, which can be slightly larger if a smaller $m_{b}$ is chosen. In this approach, the light degrees of freedom in mesons are treated as light constituent quarks with relativistic kinematics, and the form factors in the decay amplitude are essentially determined by the relativistic kenematics and the overlap of wave functions of the initial and final state mesons. Due to the large recoil momentum of the $K^{\star}$ meson at the $B$ meson rest frame, the form factors are sensitive to the overlap integral of the meson wave functions, which are determined dynamically by a QCD-motivated inter-quark potential. Relativistic effects on the meson wave functions mainly due to the Breit-Fermi interactions are found to be significant in determining the decay rate.
|
hep-ph/9603222
|
Homayoun Hamidian
|
M. Frank and H. Hamidian
|
Lepton-Flavor Violating Decays of the $Z$-boson in a Left-Right
Supersymmetric Model
|
11 pages, LaTeX, Figures are available from the authors upon request
|
Phys.Rev. D54 (1996) 6790-6796
|
10.1103/PhysRevD.54.6790
|
CUMQ/HEP 92, UCTP-115/96
|
hep-ph
| null |
We study the one-loop supersymmetric contributions to lepton-flavor violating
$Z$ -boson decays in a fully left-right symmetric model. In addition to
right-handed scalar neutrinos, the decays could receive important contributions
from doubly-charged triplet Higgsinos which couple to leptons only. We find
that the decay widths reach present experimental bounds and discuss mass
constraints for the contributing supersymmetric partners.
|
[
{
"created": "Tue, 5 Mar 1996 05:34:44 GMT",
"version": "v1"
}
] |
2009-10-28
|
[
[
"Frank",
"M.",
""
],
[
"Hamidian",
"H.",
""
]
] |
We study the one-loop supersymmetric contributions to lepton-flavor violating $Z$ -boson decays in a fully left-right symmetric model. In addition to right-handed scalar neutrinos, the decays could receive important contributions from doubly-charged triplet Higgsinos which couple to leptons only. We find that the decay widths reach present experimental bounds and discuss mass constraints for the contributing supersymmetric partners.
|
hep-ph/9304206
|
Christopher Arzt
|
C. Arzt, M.B. Einhorn, and J. Wudka
|
Effective-Lagrangian approach to precision measurements: the anomalous
magnetic moment of the muon
|
22 pages, 1 figure, PHYZZX & EPSF, report #s UCRHEP-T98, UM_TH-92-17,
and NSF-ITP-92-122I Revision: The paper will now TeX properly; the content is
unchanged
|
Phys.Rev.D49:1370-1377,1994
|
10.1103/PhysRevD.49.1370
| null |
hep-ph
| null |
We investigate the use of effective Lagrangians to describe the effects on
high-precision observables of physics beyond the Standard Model. Using the
anomalous magnetic moment of the muon as an example, we detail the use of
effective vertices in loop calculations. We then provide estimates of the
sensitivity of new experiments measuring the muon's $ g - 2 $ to the scale of
physics underlying the Standard Model.
|
[
{
"created": "Fri, 2 Apr 1993 20:10:04 GMT",
"version": "v1"
},
{
"created": "Wed, 7 Apr 1993 03:10:47 GMT",
"version": "v2"
}
] |
2011-07-19
|
[
[
"Arzt",
"C.",
""
],
[
"Einhorn",
"M. B.",
""
],
[
"Wudka",
"J.",
""
]
] |
We investigate the use of effective Lagrangians to describe the effects on high-precision observables of physics beyond the Standard Model. Using the anomalous magnetic moment of the muon as an example, we detail the use of effective vertices in loop calculations. We then provide estimates of the sensitivity of new experiments measuring the muon's $ g - 2 $ to the scale of physics underlying the Standard Model.
|
hep-ph/0304181
|
Nikolai Zotov
|
A.V. Lipatov (Moscow State University), N.P. Zotov (Skobeltsyn
Institute of Nuclear Physics, MSU)
|
Study of the colour singlet model with k_T-factorization in inclusive
J/\psi production at CERN LEP2
|
11 pages, 6 figures
| null | null | null |
hep-ph
| null |
We calculate the cross section and the transverse momentum distribution of
inclusive J/\psi production in \gamma \gamma collisions at CERN LEP2 within the
colour singlet model and the k_T-factorization approach, including both direct
and resolved photon contributions. The unintegrated gluon distribution in the
photon is determined, using the Blumlein's prescription for unintegrated gluon
distribution in a proton. We compare our theoretical predictions with
preliminary data taken by the DELPHI collaboration at LEP2. In addition, we
present our predictions for the J/\psi polarization properties.
|
[
{
"created": "Fri, 18 Apr 2003 18:10:02 GMT",
"version": "v1"
}
] |
2007-05-23
|
[
[
"Lipatov",
"A. V.",
"",
"Moscow State University"
],
[
"Zotov",
"N. P.",
"",
"Skobeltsyn\n Institute of Nuclear Physics, MSU"
]
] |
We calculate the cross section and the transverse momentum distribution of inclusive J/\psi production in \gamma \gamma collisions at CERN LEP2 within the colour singlet model and the k_T-factorization approach, including both direct and resolved photon contributions. The unintegrated gluon distribution in the photon is determined, using the Blumlein's prescription for unintegrated gluon distribution in a proton. We compare our theoretical predictions with preliminary data taken by the DELPHI collaboration at LEP2. In addition, we present our predictions for the J/\psi polarization properties.
|
2305.00101
|
Luis Hernandez
|
Irving I. Gaspar, Luis A. Hern\'andez and Renato Zamora
|
Chiral symmetry restoration in a rotating medium
|
14 pages and 6 figures. References added and typos corrected
| null | null | null |
hep-ph hep-th nucl-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We study the nature of the chiral symmetry restoration within the Yukawa
model with spontaneous symmetry breaking. We work with scalar and fermion
fields which are subject to the effects of a rotating system. In this work, we
show the derivation of the scalar field propagator in a rotating medium using
the Fock-Schwinger proper-time method. We compute analytically the effective
potential in the high-temperature approximations, including the contribution of
the ring diagrams to account for the plasma screening properties. We study the
chiral transition as we vary the angular velocity $\Omega$, the boson
self-coupling $\lambda$ and the fermion-boson coupling $g$. We show that the
critical temperature for the restoration of chiral symmetry always starts with
decreasing behaviour, until it reaches a minimum and from there when increasing
$\Omega$, we observe $T_c$ increases monotonically. In all the phase transition
lines in the $T-\Omega$ plane reported, we obtain that the rotating effects are
able to change the order of the phase transition.
|
[
{
"created": "Fri, 28 Apr 2023 21:37:56 GMT",
"version": "v1"
},
{
"created": "Thu, 8 Jun 2023 03:15:35 GMT",
"version": "v2"
}
] |
2023-06-09
|
[
[
"Gaspar",
"Irving I.",
""
],
[
"Hernández",
"Luis A.",
""
],
[
"Zamora",
"Renato",
""
]
] |
We study the nature of the chiral symmetry restoration within the Yukawa model with spontaneous symmetry breaking. We work with scalar and fermion fields which are subject to the effects of a rotating system. In this work, we show the derivation of the scalar field propagator in a rotating medium using the Fock-Schwinger proper-time method. We compute analytically the effective potential in the high-temperature approximations, including the contribution of the ring diagrams to account for the plasma screening properties. We study the chiral transition as we vary the angular velocity $\Omega$, the boson self-coupling $\lambda$ and the fermion-boson coupling $g$. We show that the critical temperature for the restoration of chiral symmetry always starts with decreasing behaviour, until it reaches a minimum and from there when increasing $\Omega$, we observe $T_c$ increases monotonically. In all the phase transition lines in the $T-\Omega$ plane reported, we obtain that the rotating effects are able to change the order of the phase transition.
|
1009.0265
|
Sannino Francesco
|
Francesco Sannino (CP3-Origins) and Joseph Schechter (Syracuse
University)
|
Nonperturbative Results for Yang-Mills Theories
|
RevTeX, 2colmuns, 6 pages and 7 figures
|
Phys.Rev.D82:096008,2010
|
10.1103/PhysRevD.82.096008
|
CP3-Origins-2010-36
|
hep-ph hep-lat hep-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Some non perturbative aspects of the pure SU(3) Yang-Mills theory are
investigated assuming a specific form of the beta function, based on a recent
modification by Ryttov and Sannino of the known one for supersymmetric gauge
theories. The characteristic feature is a pole at a particular value of the
coupling constant, g. First it is noted, using dimensional analysis, that
physical quantities behave smoothly as one travels from one side of the pole to
the other. Then it is argued that the form of the integrated beta function
g(m), where m is the mass scale, determines the mass gap of the theory.
Assuming the usual QCD value one finds it to be 1.67 GeV, which is in
surprisingly good agreement with a quenched lattice calculation. A similar
calculation is made for the supersymmetric Yang-Mills theory where the
corresponding beta function is considered to be exact.
|
[
{
"created": "Wed, 1 Sep 2010 20:00:14 GMT",
"version": "v1"
}
] |
2010-12-09
|
[
[
"Sannino",
"Francesco",
"",
"CP3-Origins"
],
[
"Schechter",
"Joseph",
"",
"Syracuse\n University"
]
] |
Some non perturbative aspects of the pure SU(3) Yang-Mills theory are investigated assuming a specific form of the beta function, based on a recent modification by Ryttov and Sannino of the known one for supersymmetric gauge theories. The characteristic feature is a pole at a particular value of the coupling constant, g. First it is noted, using dimensional analysis, that physical quantities behave smoothly as one travels from one side of the pole to the other. Then it is argued that the form of the integrated beta function g(m), where m is the mass scale, determines the mass gap of the theory. Assuming the usual QCD value one finds it to be 1.67 GeV, which is in surprisingly good agreement with a quenched lattice calculation. A similar calculation is made for the supersymmetric Yang-Mills theory where the corresponding beta function is considered to be exact.
|
hep-ph/0304303
|
Howie Baer
|
Howard Baer, Csaba Balazs, Alexander Belyaev, Tadas Krupovnickas and
Xerxes Tata
|
Updated Reach of the CERN LHC and Constraints from Relic Density, b->s
gamma and a(mu) in the mSUGRA Model
|
22 page latex file including 10 EPS figures; bug fix in relic density
code modifies figures in co-annihilation region
|
JHEP 0306:054,2003
|
10.1088/1126-6708/2003/06/054
|
FSU-HEP-030416, UH-511-1023-03
|
hep-ph
| null |
{We present an updated assessment of the reach of the CERN LHC pp collider
for supersymmetric matter in the context of the minimal supergravity (mSUGRA)
model. In addition to previously examined channels, we also include signals
with an isolated photon or with a leptonically decaying Z boson. For an
integrated luminosity of 100 fb^{-1}, values of m_{1/2}\sim 1400 GeV can be
probed for small m_0, corresponding to a gluino mass of m_{\tg}\sim 3 TeV. For
large m_0, in the hyperbolic branch/focus point region, m_{1/2}\sim 700 GeV can
be probed, corresponding to m_{\tg}\sim 1800 GeV. We also map out parameter
space regions preferred by the measured values of the dark matter relic
density, the b\to s\gamma decay rate, and the muon anomalous magnetic moment
a_\mu, and discuss how SUSY might reveal itself in these regions. We find the
CERN LHC can probe the entire stau co-annihilation region and also most of the
heavy Higgs annihilation funnel allowed by WMAP data, except for some range of
large m_0 and m_{1/2} if \tan\beta \agt 50.
|
[
{
"created": "Wed, 30 Apr 2003 19:50:39 GMT",
"version": "v1"
},
{
"created": "Thu, 19 Jun 2003 20:32:44 GMT",
"version": "v2"
}
] |
2011-03-23
|
[
[
"Baer",
"Howard",
""
],
[
"Balazs",
"Csaba",
""
],
[
"Belyaev",
"Alexander",
""
],
[
"Krupovnickas",
"Tadas",
""
],
[
"Tata",
"Xerxes",
""
]
] |
{We present an updated assessment of the reach of the CERN LHC pp collider for supersymmetric matter in the context of the minimal supergravity (mSUGRA) model. In addition to previously examined channels, we also include signals with an isolated photon or with a leptonically decaying Z boson. For an integrated luminosity of 100 fb^{-1}, values of m_{1/2}\sim 1400 GeV can be probed for small m_0, corresponding to a gluino mass of m_{\tg}\sim 3 TeV. For large m_0, in the hyperbolic branch/focus point region, m_{1/2}\sim 700 GeV can be probed, corresponding to m_{\tg}\sim 1800 GeV. We also map out parameter space regions preferred by the measured values of the dark matter relic density, the b\to s\gamma decay rate, and the muon anomalous magnetic moment a_\mu, and discuss how SUSY might reveal itself in these regions. We find the CERN LHC can probe the entire stau co-annihilation region and also most of the heavy Higgs annihilation funnel allowed by WMAP data, except for some range of large m_0 and m_{1/2} if \tan\beta \agt 50.
|
hep-ph/0403016
|
M. N. Rebelo
|
G. C. Branco, M. N. Rebelo and J. I. Silva-Marcos
|
Non-Factorizable Phases, Yukawa Textures and the Size of sin (2 beta)
|
15 pages, 3 figures
|
Phys.Lett. B597 (2004) 155-165
|
10.1016/j.physletb.2004.06.109
|
CERN-PH-TH/2004-038
|
hep-ph
| null |
We emphasize the crucial r\^ ole played by non-factorizable phases in the
analysis of the Yukawa flavour structure performed in weak bases with Hermitian
mass matrices and with vanishing $(1,1)$ entries. We show that non-factorizable
phases are important in order to generate a sufficiently large $\sin 2 \beta $.
A method is suggested to reconstruct the flavour structure of Yukawa couplings
from input experimental data both in this Hermitian basis and in a
non-Hermitian basis with a maximal number of texture zeros. The corresponding
Froggatt--Nielsen patterns are presented in both cases.
|
[
{
"created": "Mon, 1 Mar 2004 18:42:18 GMT",
"version": "v1"
}
] |
2009-11-10
|
[
[
"Branco",
"G. C.",
""
],
[
"Rebelo",
"M. N.",
""
],
[
"Silva-Marcos",
"J. I.",
""
]
] |
We emphasize the crucial r\^ ole played by non-factorizable phases in the analysis of the Yukawa flavour structure performed in weak bases with Hermitian mass matrices and with vanishing $(1,1)$ entries. We show that non-factorizable phases are important in order to generate a sufficiently large $\sin 2 \beta $. A method is suggested to reconstruct the flavour structure of Yukawa couplings from input experimental data both in this Hermitian basis and in a non-Hermitian basis with a maximal number of texture zeros. The corresponding Froggatt--Nielsen patterns are presented in both cases.
|
hep-ph/9904309
|
Santosh Shelly Sharma
|
S. Shelly Sharma, and F. Pisano
|
Reply to ``Comment on `Majoron emitting neutrinoless double beta decay
in the electroweak chiral gauge extensions' ''
|
Revtex, 3pages, Reply to hep-ph/9902448, Submitted to Phys. Rev. D
|
Phys.Rev. D60 (1999) 098702
|
10.1103/PhysRevD.60.098702
| null |
hep-ph nucl-th
| null |
We demonstrate that in the process of deducing the constraint on the
electroweak mixing angle $\theta_{W}$ in our paper, we have indeed been working
with three mass scales while implementing (331) model.
|
[
{
"created": "Mon, 12 Apr 1999 19:20:29 GMT",
"version": "v1"
}
] |
2009-10-31
|
[
[
"Sharma",
"S. Shelly",
""
],
[
"Pisano",
"F.",
""
]
] |
We demonstrate that in the process of deducing the constraint on the electroweak mixing angle $\theta_{W}$ in our paper, we have indeed been working with three mass scales while implementing (331) model.
|
hep-ph/9412236
| null |
Piotr A. Raczka and Andrzej Szymacha (Warsaw University)
|
Improved analysis of the renormalization scheme ambiguities in the QCD
corrections to the semileptonic decay of the tau lepton
|
determination of alpha-s from experimental data for tau decay has
been discussed in more detail (appendix has been added) and relation to other
work on the same subject has been clarified. Notation has been changed to
that more common in phenomenological analysis. One curve has been added on
fig.4
|
Z.Phys. C70 (1996) 125-132
| null |
IFT-13-94
|
hep-ph
| null |
The perturbative QCD corrections to the semileptonic decay width of the tau
lepton are evaluated in the next-next-to-leading order from the contour
integral representation in various renormalization schemes, using numerical
solution of the renormalization group equation for complex energies. A
quantitative estimate of the ambiguities resulting from the freedom of choice
of the renormalization scheme is obtained by taking into account predictions in
all schemes that do not involve large cancellations in the expression for the
scheme invariant combination of the expansion coefficients. The problem of an
optimal choice of the renormalization scheme for the improved perturbative
expression is discussed. A fit of $\Lambda_{\overline{MS}}$ is made using the
available experimental data.
|
[
{
"created": "Mon, 5 Dec 1994 18:31:28 GMT",
"version": "v1"
},
{
"created": "Sun, 28 May 1995 00:51:29 GMT",
"version": "v2"
}
] |
2008-02-03
|
[
[
"Raczka",
"Piotr A.",
"",
"Warsaw University"
],
[
"Szymacha",
"Andrzej",
"",
"Warsaw University"
]
] |
The perturbative QCD corrections to the semileptonic decay width of the tau lepton are evaluated in the next-next-to-leading order from the contour integral representation in various renormalization schemes, using numerical solution of the renormalization group equation for complex energies. A quantitative estimate of the ambiguities resulting from the freedom of choice of the renormalization scheme is obtained by taking into account predictions in all schemes that do not involve large cancellations in the expression for the scheme invariant combination of the expansion coefficients. The problem of an optimal choice of the renormalization scheme for the improved perturbative expression is discussed. A fit of $\Lambda_{\overline{MS}}$ is made using the available experimental data.
|
1408.6833
|
Markos Maniatis
|
M. Maniatis and O. Nachtmann
|
Stability and symmetry breaking in the general three-Higgs-doublet model
|
21 pages. Revised version with errors corrected with respect to the
stability and stationarity equations for the case of the bilinear's matrix of
rank 1. Ensueing errors in Chapter 7 and appendix B are also corrected
| null |
10.1007/JHEP02(2015)058
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Stability, electroweak symmetry breaking, and the stationarity equations of
the general three-Higgs-doublet model (3HDM) where all doublets carry the same
hypercharge are discussed in detail. Employing the bilinear formalism the study
of the 3HDM potential turns out to be straightforward. For the case that the
potential leads to the physically relevant electroweak symmetry breaking we
present explicit formulae for the masses of the physical Higgs bosons.
|
[
{
"created": "Thu, 28 Aug 2014 19:59:58 GMT",
"version": "v1"
},
{
"created": "Tue, 3 Mar 2015 13:49:51 GMT",
"version": "v2"
},
{
"created": "Fri, 17 Jul 2015 16:55:48 GMT",
"version": "v3"
}
] |
2015-07-20
|
[
[
"Maniatis",
"M.",
""
],
[
"Nachtmann",
"O.",
""
]
] |
Stability, electroweak symmetry breaking, and the stationarity equations of the general three-Higgs-doublet model (3HDM) where all doublets carry the same hypercharge are discussed in detail. Employing the bilinear formalism the study of the 3HDM potential turns out to be straightforward. For the case that the potential leads to the physically relevant electroweak symmetry breaking we present explicit formulae for the masses of the physical Higgs bosons.
|
1306.5647
|
Glenn D. Starkman
|
Bryan W. Lynn and Glenn D. Starkman
|
The Goldstone theorem protects naturalness, and the absence of
Brout-Englert-Higgs fine-tuning, in spontaneously broken SO(2)
|
Improved presentation with only minor changes in content
| null | null | null |
hep-ph hep-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
The Gell-Mann-Levy (GML), Schwinger and Standard Models were previously shown
to lack a Brout-Englert-Higgs (BEH) fine-tuning problem due to quadratic
divergences, with finite Euclidean cut-off \Lambda, because of the symmetries
obeyed by all O(\Lambda^2) contributions. We extend those results to finite
contributions from certain M_{Heavy}^2>> m_{BEH}^2 particles in SO(2) versions
of GML and Schwinger. We demonstrate explicit 1-loop physical naturalness for
two SO(2) singlet examples: a heavy real scalar S and a right-handed Type 1
see-saw Majorana neutrino. We prove that for low |q^2| the heavy degrees of
freedom contribute, at worst, marginal operators in spontaneously broken SO(2)
Schwinger.
The key GML lesson from these examples is that the pseudo Nambu-Goldstone
boson (NGB) mass-squared must be properly renormalized. A true NGB value, m_3^2
= 0, is then protected by the Goldstone theorem. For the Schwinger model, two
crucial observations emerge: global Ward-Takahashi identities (WTI) force all
relevant operators into the pseudo-NGB mass-squared; and WTI enforce the
Goldstone theorem by forbidding all relevant operator contributions in the
spontaneously broken Goldstone mode, \pi_3 is a massless NGB there. Goldstone
mode, with weak-scale m_{BEH}^2 \& <H>^2, is not-fine-tuned even as a
low-energy effective theory with certain high-mass-scale extensions. Its
"Goldstone Exceptional Naturalness (GEN)," where all relevant operators vanish,
a powerful suppression of fine-tuning, is simply another (albeit un-familiar)
consequence of WTI, spontaneous symmetry breaking and the Goldstone theorem.
If GEN can somehow be extended to the Standard Model (SM), there should be no
expectation that LHC will discover any Beyond the SM physics unrelated to
neutrino mixing, i.e. the only known experimentally necessary modification of
the Standard Model plus General Relativity paradigm.
|
[
{
"created": "Mon, 24 Jun 2013 15:01:31 GMT",
"version": "v1"
},
{
"created": "Tue, 11 Nov 2014 03:50:52 GMT",
"version": "v2"
}
] |
2014-11-12
|
[
[
"Lynn",
"Bryan W.",
""
],
[
"Starkman",
"Glenn D.",
""
]
] |
The Gell-Mann-Levy (GML), Schwinger and Standard Models were previously shown to lack a Brout-Englert-Higgs (BEH) fine-tuning problem due to quadratic divergences, with finite Euclidean cut-off \Lambda, because of the symmetries obeyed by all O(\Lambda^2) contributions. We extend those results to finite contributions from certain M_{Heavy}^2>> m_{BEH}^2 particles in SO(2) versions of GML and Schwinger. We demonstrate explicit 1-loop physical naturalness for two SO(2) singlet examples: a heavy real scalar S and a right-handed Type 1 see-saw Majorana neutrino. We prove that for low |q^2| the heavy degrees of freedom contribute, at worst, marginal operators in spontaneously broken SO(2) Schwinger. The key GML lesson from these examples is that the pseudo Nambu-Goldstone boson (NGB) mass-squared must be properly renormalized. A true NGB value, m_3^2 = 0, is then protected by the Goldstone theorem. For the Schwinger model, two crucial observations emerge: global Ward-Takahashi identities (WTI) force all relevant operators into the pseudo-NGB mass-squared; and WTI enforce the Goldstone theorem by forbidding all relevant operator contributions in the spontaneously broken Goldstone mode, \pi_3 is a massless NGB there. Goldstone mode, with weak-scale m_{BEH}^2 \& <H>^2, is not-fine-tuned even as a low-energy effective theory with certain high-mass-scale extensions. Its "Goldstone Exceptional Naturalness (GEN)," where all relevant operators vanish, a powerful suppression of fine-tuning, is simply another (albeit un-familiar) consequence of WTI, spontaneous symmetry breaking and the Goldstone theorem. If GEN can somehow be extended to the Standard Model (SM), there should be no expectation that LHC will discover any Beyond the SM physics unrelated to neutrino mixing, i.e. the only known experimentally necessary modification of the Standard Model plus General Relativity paradigm.
|
hep-ph/0103016
|
Ana Gabriela Grunfeld
|
L. Epele, H. Fanchiotti, D. Gomez Dumm, A. G. Grunfeld
|
Radiative decays of mesons in the NJL model
|
19 pages incl. 4 figures
|
Eur.Phys.J.C20:531-539,2001
|
10.1007/s100520100688
|
LA PLATA-TH-01/02
|
hep-ph
| null |
We revisit the theoretical predictions for anomalous radiative decays of
pseudoscalar and vector mesons. Our analysis is performed in the framework of
the Nambu-Jona-Lasinio model, introducing adequate parameters to account for
the breakdown of chiral symmetry. The results are comparable with those
obtained in previous approaches.
|
[
{
"created": "Thu, 1 Mar 2001 19:17:18 GMT",
"version": "v1"
}
] |
2009-01-07
|
[
[
"Epele",
"L.",
""
],
[
"Fanchiotti",
"H.",
""
],
[
"Dumm",
"D. Gomez",
""
],
[
"Grunfeld",
"A. G.",
""
]
] |
We revisit the theoretical predictions for anomalous radiative decays of pseudoscalar and vector mesons. Our analysis is performed in the framework of the Nambu-Jona-Lasinio model, introducing adequate parameters to account for the breakdown of chiral symmetry. The results are comparable with those obtained in previous approaches.
|
1207.3679
|
Dmitri Diakonov
|
Dmitri Diakonov, Victor Petrov and Alexey A. Vladimirov
|
Baryon resonances at large Nc, or Quark Nuclear Physics
|
Invited talk at the Sixth International Conference on Quarks and
Nuclear Physics, April 16-20, 2012, Ecole Polytechnique, Palaiseau, Paris,
France, to be published in the Proceedings
| null | null | null |
hep-ph hep-ex
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We suggest a new point of view according to which baryon resonances can be
understood as collective excitations about intrinsic one-quark excitations in a
mean field of definite symmetry. This approach is justified in the limit of
large number of colours Nc, and is similar to the physics of large-A nuclei,
hence "quark nuclear physics". Although in the real world Nc is only three, we
obtain a good agreement with the observed resonance spectrum of light baryons
up to 2 GeV, and of lowest charmed baryon multiplets. A by-product of the
scheme is the prediction of new exotic charmed (and bottom) baryons that may be
stable against strong decays.
|
[
{
"created": "Mon, 16 Jul 2012 13:38:03 GMT",
"version": "v1"
}
] |
2012-07-17
|
[
[
"Diakonov",
"Dmitri",
""
],
[
"Petrov",
"Victor",
""
],
[
"Vladimirov",
"Alexey A.",
""
]
] |
We suggest a new point of view according to which baryon resonances can be understood as collective excitations about intrinsic one-quark excitations in a mean field of definite symmetry. This approach is justified in the limit of large number of colours Nc, and is similar to the physics of large-A nuclei, hence "quark nuclear physics". Although in the real world Nc is only three, we obtain a good agreement with the observed resonance spectrum of light baryons up to 2 GeV, and of lowest charmed baryon multiplets. A by-product of the scheme is the prediction of new exotic charmed (and bottom) baryons that may be stable against strong decays.
|
hep-ph/0211247
|
Stephen Godfrey
|
Stephen Godfrey (Carleton U & DESY) and M.A. Doncheski (Penn State
University, Mont Alto)
|
Phenomenology of Non-Commutative Field Theories
|
9 pages, 5 figures, Talk given at the SUSY 2002 Conference (DESY,
Hamburg, Germany, June 2002). To appear in the SUSY 2002 Conference
Proceedings
| null | null |
DESY 02-195
|
hep-ph
| null |
We study the effects of non-commutative QED (NCQED) in fermion pair
production, gamma + gamma to f + \bar{f} and Compton scattering, e + gamma to e
+ gamma. Non-commutative geometries give rise to 3- and 4-point photon vertices
and to momentum dependent phase factors in QED vertices which will have
observable effects in high energy collisions. We consider e^+ e^- colliders
with energies appropriate to the TeV Linear Collider proposals and the
multi-TeV CLIC project operating in gamma gamma and e gamma modes.
Non-commutative scales roughly equal to the center of mass energy of the e^+e^-
collider can be probed, with the exact value depending on the model parameters
and experimental factors. The Compton process is sensitive to Lambda_{NC}
values roughly twice as large as those accessible to the pair production
process.
|
[
{
"created": "Fri, 15 Nov 2002 16:05:17 GMT",
"version": "v1"
}
] |
2007-05-23
|
[
[
"Godfrey",
"Stephen",
"",
"Carleton U & DESY"
],
[
"Doncheski",
"M. A.",
"",
"Penn State\n University, Mont Alto"
]
] |
We study the effects of non-commutative QED (NCQED) in fermion pair production, gamma + gamma to f + \bar{f} and Compton scattering, e + gamma to e + gamma. Non-commutative geometries give rise to 3- and 4-point photon vertices and to momentum dependent phase factors in QED vertices which will have observable effects in high energy collisions. We consider e^+ e^- colliders with energies appropriate to the TeV Linear Collider proposals and the multi-TeV CLIC project operating in gamma gamma and e gamma modes. Non-commutative scales roughly equal to the center of mass energy of the e^+e^- collider can be probed, with the exact value depending on the model parameters and experimental factors. The Compton process is sensitive to Lambda_{NC} values roughly twice as large as those accessible to the pair production process.
|
1509.07894
|
Matthias Le Dall
|
Matthias Le Dall
|
Light Leptonic New Physics at the Precision Frontier
|
4 pages, 2 figures, PPC2015 Proceedings
| null |
10.1063/1.4953319
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Precision probes of new physics are often interpreted through their indirect
sensitivity to short-distance scales. In this proceedings contribution, we
focus on the question of which precision observables, at current sensitivity
levels, allow for an interpretation via either short-distance new physics or
consistent models of long-distance new physics, weakly coupled to the Standard
Model. The electroweak scale is chosen to set the dividing line between these
scenarios. In particular, we find that inverse see-saw models of neutrino mass
allow for light new physics interpretations of most precision leptonic
observables, such as lepton universality, lepton flavor violation, but not for
the electron EDM.
|
[
{
"created": "Fri, 25 Sep 2015 21:03:57 GMT",
"version": "v1"
}
] |
2017-08-23
|
[
[
"Dall",
"Matthias Le",
""
]
] |
Precision probes of new physics are often interpreted through their indirect sensitivity to short-distance scales. In this proceedings contribution, we focus on the question of which precision observables, at current sensitivity levels, allow for an interpretation via either short-distance new physics or consistent models of long-distance new physics, weakly coupled to the Standard Model. The electroweak scale is chosen to set the dividing line between these scenarios. In particular, we find that inverse see-saw models of neutrino mass allow for light new physics interpretations of most precision leptonic observables, such as lepton universality, lepton flavor violation, but not for the electron EDM.
|
hep-ph/0404083
|
Maria Amparo T\'ortola
|
E. Kh. Akhmedov, M. A. Tortola and J. W. F. Valle
|
A simple analytic three-flavour description of the day-night effect in
the solar neutrino flux
|
22 pages, 6 figures. New appendix with the derivation of Eq. (3.6)
added. Version published in JHEP
|
JHEP 0405:057,2004
|
10.1088/1126-6708/2004/05/057
|
IFIC/04-13
|
hep-ph astro-ph hep-ex
| null |
In the 3-flavour framework we derive a simple approximate analytic expression
for the day-night difference of the flux of solar $\nu_e$ at terrestrial
detectors which is valid for an arbitrary Earth density profile. Our formula
has the accuracy of a few per cent and reproduces all the known analytic
expressions for the Earth matter effects on the solar neutrino oscillations
obtained under simplifying assumptions about the Earth's density profile
(matter of constant density, 3 layers of constant densities, and adiabatic
approximation). It can also be used for studying the Earth matter effects on
the oscillations of supernova neutrinos. We also discuss the possibility of
probing the leptonic mixing angle $\theta_{13}$ through day--night asymmetry
measurements at future water Cherenkov solar neutrino detectors. We show that,
depending on the measured value of the asymmetry, the current upper bound on
$\theta_{13}$ may be improved, or even a lower bound on this mixing parameter
may be obtained.
|
[
{
"created": "Thu, 8 Apr 2004 17:43:51 GMT",
"version": "v1"
},
{
"created": "Tue, 13 Apr 2004 17:02:52 GMT",
"version": "v2"
},
{
"created": "Fri, 3 Dec 2004 18:00:54 GMT",
"version": "v3"
}
] |
2009-11-10
|
[
[
"Akhmedov",
"E. Kh.",
""
],
[
"Tortola",
"M. A.",
""
],
[
"Valle",
"J. W. F.",
""
]
] |
In the 3-flavour framework we derive a simple approximate analytic expression for the day-night difference of the flux of solar $\nu_e$ at terrestrial detectors which is valid for an arbitrary Earth density profile. Our formula has the accuracy of a few per cent and reproduces all the known analytic expressions for the Earth matter effects on the solar neutrino oscillations obtained under simplifying assumptions about the Earth's density profile (matter of constant density, 3 layers of constant densities, and adiabatic approximation). It can also be used for studying the Earth matter effects on the oscillations of supernova neutrinos. We also discuss the possibility of probing the leptonic mixing angle $\theta_{13}$ through day--night asymmetry measurements at future water Cherenkov solar neutrino detectors. We show that, depending on the measured value of the asymmetry, the current upper bound on $\theta_{13}$ may be improved, or even a lower bound on this mixing parameter may be obtained.
|
hep-ph/0004034
|
Jacek Pliszka
|
Bohdan Grzadkowski (Warsaw Univ.), John F. Gunion (UC Davis), Jacek
Pliszka(Warsaw Univ.)
|
Measuring the relative CP-even and CP-odd Yukawa couplings of a Higgs
boson at a muon-collider Higgs factory
|
5 pages, LaTeX2e, hyperref, ws-p8-50x6-00 class, talk given at PASCOS
'99, Lake Tahoe, California, December 10-16, 1999, no changes in the paper
| null | null | null |
hep-ph
| null |
We study a possibility of a measurement of muon Yukawa couplings in s-channel
Higgs boson production at a muon collider with transversely polarized beams. We
investigate sensitivity to the relative size of the CP-odd and CP-even muon
Yukawa couplings. Provided the event rate observed justify the operation of the
$\mu^+\mu^-$ Higgs boson factory, we have found that polarization degree 40% is
sufficient to resolve the CP nature of a single resonance as well as
disentangle it from two overlapping CP conserving resonances.
|
[
{
"created": "Tue, 4 Apr 2000 21:11:06 GMT",
"version": "v1"
},
{
"created": "Thu, 6 Apr 2000 18:30:37 GMT",
"version": "v2"
}
] |
2007-05-23
|
[
[
"Grzadkowski",
"Bohdan",
"",
"Warsaw Univ."
],
[
"Gunion",
"John F.",
"",
"UC Davis"
],
[
"Pliszka",
"Jacek",
"",
"Warsaw Univ."
]
] |
We study a possibility of a measurement of muon Yukawa couplings in s-channel Higgs boson production at a muon collider with transversely polarized beams. We investigate sensitivity to the relative size of the CP-odd and CP-even muon Yukawa couplings. Provided the event rate observed justify the operation of the $\mu^+\mu^-$ Higgs boson factory, we have found that polarization degree 40% is sufficient to resolve the CP nature of a single resonance as well as disentangle it from two overlapping CP conserving resonances.
|
1811.01180
|
Yi Liao
|
Chao Guo, Shu-Yuan Guo and Yi Liao
|
Dark matter and LHC phenomenology of a scale invariant scotogenic model
|
22 pages, 7 figures, 3 tables; v2: 24 pages, 8 figures, 4 tables,
same as the published version
|
Chinese Physics C Vol. 43, No. 10 (2019) 103102
|
10.1088/1674-1137/43/10/103102
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We study the phenomenology of a model that addresses the neutrino mass, dark
matter, and generation of the electroweak scale in a single framework.
Electroweak symmetry breaking is realized via the Coleman-Weinberg mechanism in
a classically scale invariant theory, while the neutrino mass is generated
radiatively through interactions with dark matter in a typically scotogenic
manner. The model introduces a scalar triplet and singlet and a vector-like
fermion doublet that carry an odd parity of $Z_2$, and an even parity scalar
singlet that helps preserve classical scale invariance. We sample over the
parameter space by taking into account various experimental constraints from
the dark matter relic density and direct detection, direct scalar searches,
neutrino mass, and charged lepton flavor violating decays. We then examine by
detailed simulations possible signatures at the LHC to find some benchmark
points of the free parameters. We find that the future high-luminosity LHC will
have a significant potential in detecting new physics signals in the dilepton
channel.
|
[
{
"created": "Sat, 3 Nov 2018 09:15:34 GMT",
"version": "v1"
},
{
"created": "Mon, 12 Nov 2018 11:59:17 GMT",
"version": "v2"
},
{
"created": "Tue, 1 Oct 2019 14:12:29 GMT",
"version": "v3"
}
] |
2019-10-02
|
[
[
"Guo",
"Chao",
""
],
[
"Guo",
"Shu-Yuan",
""
],
[
"Liao",
"Yi",
""
]
] |
We study the phenomenology of a model that addresses the neutrino mass, dark matter, and generation of the electroweak scale in a single framework. Electroweak symmetry breaking is realized via the Coleman-Weinberg mechanism in a classically scale invariant theory, while the neutrino mass is generated radiatively through interactions with dark matter in a typically scotogenic manner. The model introduces a scalar triplet and singlet and a vector-like fermion doublet that carry an odd parity of $Z_2$, and an even parity scalar singlet that helps preserve classical scale invariance. We sample over the parameter space by taking into account various experimental constraints from the dark matter relic density and direct detection, direct scalar searches, neutrino mass, and charged lepton flavor violating decays. We then examine by detailed simulations possible signatures at the LHC to find some benchmark points of the free parameters. We find that the future high-luminosity LHC will have a significant potential in detecting new physics signals in the dilepton channel.
|
2206.09308
|
Bochao Liu
|
Ke Wang, Shao-Fei Chen and Bo-Chao Liu
|
Studying triangle singularity through spin observables
|
7 pages and 5 figures. Replaced with the published version. Added
more calculations and discussions
| null |
10.1103/PhysRevD.106.094032
| null |
hep-ph hep-ex
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
In this work, we study the spin density matrix element $\rho_{00}$ of the
$\phi$ in the decay $J/\psi \rightarrow \eta \pi \phi$. In previous studies, a
band around 1.4 GeV on the $\pi^0\phi$ distribution in Dalitz plot was reported
by the BESIII Collaboration. This structure may be caused by the production of
a resonance or the triangle singularity mechanism. We find that the predictions
of the spin density matrix elements of the final $\phi$ based on these
mechanisms show distinct features. Thus the measurement of the spin density
matrix elements of the $\phi$ in this reaction may offer an alternative way to
study the triangle singularity and to clarify the reaction mechanisms, i.e.
resonance production or kinematic effects. This work also shows the potential
of spin observables in studying kinematic singularities.
|
[
{
"created": "Sun, 19 Jun 2022 02:16:46 GMT",
"version": "v1"
},
{
"created": "Tue, 22 Nov 2022 13:51:27 GMT",
"version": "v2"
}
] |
2022-12-07
|
[
[
"Wang",
"Ke",
""
],
[
"Chen",
"Shao-Fei",
""
],
[
"Liu",
"Bo-Chao",
""
]
] |
In this work, we study the spin density matrix element $\rho_{00}$ of the $\phi$ in the decay $J/\psi \rightarrow \eta \pi \phi$. In previous studies, a band around 1.4 GeV on the $\pi^0\phi$ distribution in Dalitz plot was reported by the BESIII Collaboration. This structure may be caused by the production of a resonance or the triangle singularity mechanism. We find that the predictions of the spin density matrix elements of the final $\phi$ based on these mechanisms show distinct features. Thus the measurement of the spin density matrix elements of the $\phi$ in this reaction may offer an alternative way to study the triangle singularity and to clarify the reaction mechanisms, i.e. resonance production or kinematic effects. This work also shows the potential of spin observables in studying kinematic singularities.
|
2109.07849
|
Maria Gomez-Rocha
|
Oliver Heger, Mar\'ia G\'omez-Rocha and Wolfgang Schweiger
|
Weak transition form factors of heavy-light pseudoscalar mesons for
space- and timelike momentum transfers
|
20 pages, 17 figures
| null |
10.1103/PhysRevD.104.116005
| null |
hep-ph nucl-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Weak $B^-\rightarrow D^0, \pi^0$ and $D^-\rightarrow {K}^0, \pi^0$ transition
form factors are described in both the space- and time-like momentum transfer
regions, within a constituent-quark model. Neutrino-meson scattering and
semileptonic weak decays are formulated within the point form of relativistic
quantum mechanics to end up with relativistic invariant process amplitudes from
which meson transition currents and form factors are extracted in an
unambiguous way. For space-like momentum transfers, form factors depend on the
frame in which the $W M M^\prime$ vertex is considered. Such a frame dependence
is expected from a pure valence-quark picture, since a complete, frame
independent description of form factors is supposed to include non-valence
contributions. The most important of such contributions are the $Z$-graphs,
which are, however, suppressed in the infinite-momentum frame ($q^2<0$). On the
other hand, they can play a significant role in the Breit frame ($q^2<0$) and
in the direct decay calculation ($q^2>0$), as a comparison with the
infinite-momentum-frame form factors (analytically continued to $q^2>0$)
reveals. Numerical results for the analytically continued
infinite-momentum-frame form factors agree very well with lattice data in the
time-like momentum transfer region and the experimental value for the slope of
the $F^+_{B\rightarrow D}$ transition form factor at zero recoil is reproduced
satisfactorily. These predictions satisfy heavy-quark-symmetry constraints and
their $q^2$ dependence is well approximated by a pole fit, reminiscent of a
vector-meson-dominance-like decay mechanism. We discuss how such a decay
mechanism can be accommodated within an extension of our constituent-quark
model, by allowing for a non-valence component in the meson wave functions. We
also address the question of wrong cluster properties inherent in the
Bakamjian-Thomas formulation.
|
[
{
"created": "Thu, 16 Sep 2021 10:27:40 GMT",
"version": "v1"
},
{
"created": "Tue, 8 Feb 2022 11:45:31 GMT",
"version": "v2"
}
] |
2022-02-09
|
[
[
"Heger",
"Oliver",
""
],
[
"Gómez-Rocha",
"María",
""
],
[
"Schweiger",
"Wolfgang",
""
]
] |
Weak $B^-\rightarrow D^0, \pi^0$ and $D^-\rightarrow {K}^0, \pi^0$ transition form factors are described in both the space- and time-like momentum transfer regions, within a constituent-quark model. Neutrino-meson scattering and semileptonic weak decays are formulated within the point form of relativistic quantum mechanics to end up with relativistic invariant process amplitudes from which meson transition currents and form factors are extracted in an unambiguous way. For space-like momentum transfers, form factors depend on the frame in which the $W M M^\prime$ vertex is considered. Such a frame dependence is expected from a pure valence-quark picture, since a complete, frame independent description of form factors is supposed to include non-valence contributions. The most important of such contributions are the $Z$-graphs, which are, however, suppressed in the infinite-momentum frame ($q^2<0$). On the other hand, they can play a significant role in the Breit frame ($q^2<0$) and in the direct decay calculation ($q^2>0$), as a comparison with the infinite-momentum-frame form factors (analytically continued to $q^2>0$) reveals. Numerical results for the analytically continued infinite-momentum-frame form factors agree very well with lattice data in the time-like momentum transfer region and the experimental value for the slope of the $F^+_{B\rightarrow D}$ transition form factor at zero recoil is reproduced satisfactorily. These predictions satisfy heavy-quark-symmetry constraints and their $q^2$ dependence is well approximated by a pole fit, reminiscent of a vector-meson-dominance-like decay mechanism. We discuss how such a decay mechanism can be accommodated within an extension of our constituent-quark model, by allowing for a non-valence component in the meson wave functions. We also address the question of wrong cluster properties inherent in the Bakamjian-Thomas formulation.
|
1111.5368
|
Aleksander Kusina
|
M. Skrzypek, S. Jadach, A. Kusina, W. Placzek, M. Slawinska and O.
Gituliar
|
Fully NLO Parton Shower in QCD
|
Contribution to the XXXV International Conference of Theoretical
Physics "Matter to the Deepest", Ustron, Poland, September 12-18, 2011
|
Acta Phys. Polon. B42:2433-2443, 2011
|
10.5506/APhysPolB.42.2433
|
IFJPAN-IV-2011-9
|
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
The project of constructing a complete NLO-level Parton Shower Monte Carlo
for the QCD processes developed in IFJ PAN in Krakow is reviewed. Four issues
are discussed: (1) the extension of the standard inclusive collinear
factorization into a new, fully exclusive scheme; (2) reconstruction of the LO
Parton Shower in the new scheme; (3) inclusion of the exclusive NLO corrections
into the hard process and (4) inclusion of the exclusive NLO corrections into
the evolution (ladder) part.
|
[
{
"created": "Tue, 22 Nov 2011 23:31:27 GMT",
"version": "v1"
}
] |
2011-11-24
|
[
[
"Skrzypek",
"M.",
""
],
[
"Jadach",
"S.",
""
],
[
"Kusina",
"A.",
""
],
[
"Placzek",
"W.",
""
],
[
"Slawinska",
"M.",
""
],
[
"Gituliar",
"O.",
""
]
] |
The project of constructing a complete NLO-level Parton Shower Monte Carlo for the QCD processes developed in IFJ PAN in Krakow is reviewed. Four issues are discussed: (1) the extension of the standard inclusive collinear factorization into a new, fully exclusive scheme; (2) reconstruction of the LO Parton Shower in the new scheme; (3) inclusion of the exclusive NLO corrections into the hard process and (4) inclusion of the exclusive NLO corrections into the evolution (ladder) part.
|
hep-ph/9306306
|
Oscar Eboli
|
O.J.P.Eboli, M.C.Gonzalez-Garcia, and S.F.Novaes
|
Quartic Anomalous Couplings in $e\gamma$ Colliders
|
21 pages and 7 figures appended as a postscript file (uuencoded),
MAD/PH/764, IFT-P.031/93, IFUSP-P 1047 (uses REVTeX3)
|
Nucl.Phys. B411 (1994) 381-396
|
10.1016/0550-3213(94)90455-3
| null |
hep-ph
| null |
We study the production of gauge boson pairs at the next generation of linear
$e^+e^-$ colliders operating in the $e\gamma$ mode. The processes $e\gamma
\rightarrow VV^\prime F$ ($V,V^\prime =W$, $Z$, or $\gamma$ and $F=e$ or $\nu$)
can give valuable information on possible deviations of the quartic vector
boson couplings from the Standard Model predictions. We establish the range of
the new couplings that can be explored in these colliders based on a $3\sigma$
effect in the total cross section. We also present several kinematical
distributions of the final state particles that could manifest the underlying
new dynamics. Our results show that an $e\gamma$ collider can extend
considerably the bounds on anomalous interactions coming from oblique radiative
corrections and from direct searches in $e^+e^-$ colliders.
|
[
{
"created": "Wed, 23 Jun 1993 14:47:18 GMT",
"version": "v1"
}
] |
2009-10-22
|
[
[
"Eboli",
"O. J. P.",
""
],
[
"Gonzalez-Garcia",
"M. C.",
""
],
[
"Novaes",
"S. F.",
""
]
] |
We study the production of gauge boson pairs at the next generation of linear $e^+e^-$ colliders operating in the $e\gamma$ mode. The processes $e\gamma \rightarrow VV^\prime F$ ($V,V^\prime =W$, $Z$, or $\gamma$ and $F=e$ or $\nu$) can give valuable information on possible deviations of the quartic vector boson couplings from the Standard Model predictions. We establish the range of the new couplings that can be explored in these colliders based on a $3\sigma$ effect in the total cross section. We also present several kinematical distributions of the final state particles that could manifest the underlying new dynamics. Our results show that an $e\gamma$ collider can extend considerably the bounds on anomalous interactions coming from oblique radiative corrections and from direct searches in $e^+e^-$ colliders.
|
2112.12515
|
Duarte Rocha Peixoto Azevedo
|
Hamza Abouabid, Abdesslam Arhrib, Duarte Azevedo, Jaouad El Falaki,
Pedro. M. Ferreira, Margarete Muhlleitner, Rui Santos
|
Benchmarking Di-Higgs Production in Various Extended Higgs Sector Models
| null |
J. High Energ. Phys. 11 (2022)
|
10.1007/JHEP09(2022)011
| null |
hep-ph hep-ex
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We present a comprehensive study on Higgs pair production in various
archetypical extended Higgs sectors such as the real and the complex
2-Higgs-Doublet Model, the 2-Higgs-Doublet Model augmented by a real singlet
field and the Next-to-Minimal Supersymmetric extension of the Standard Model.
We take into account all relevant theoretical and experimental constraints, in
particular the experimental limits on non-resonant and resonant Higgs pair
production. We present the allowed cross sections for Standard Model (SM)-like
Higgs pair production and the ranges of the SM-like Yukawa and trilinear Higgs
self-coupling that are still compatible with the applied constraints.
Furthermore, we give results for the pair production of a SM-like with a
non-SM-like Higgs boson and for the production of a pair of non-SM-like Higgs
bosons. We find that di-Higgs production in the models under investigation can
exceed the SM rate substantially, not only in the non-resonance region but also
due to resonant enhancement. We give several benchmarks with interesting
features such as large cross sections, the possibility to test CP violation,
Higgs-to-Higgs cascade decays or di-Higgs production beating single Higgs
production. In all of our benchmark points, the next-to-leading order QCD
corrections are included in the large top-mass limit. For these points, we
found that, depending on the model and the Higgs pair final state, the
corrections increase the leading order cross section by a factor of 1.79 to
2.24. We also discuss the relation between the description of Higgs pair
production in an effective field theory approach and in the specific models
investigated here.
|
[
{
"created": "Thu, 23 Dec 2021 13:09:30 GMT",
"version": "v1"
},
{
"created": "Tue, 13 Sep 2022 11:27:16 GMT",
"version": "v2"
}
] |
2022-09-14
|
[
[
"Abouabid",
"Hamza",
""
],
[
"Arhrib",
"Abdesslam",
""
],
[
"Azevedo",
"Duarte",
""
],
[
"Falaki",
"Jaouad El",
""
],
[
"Ferreira",
"Pedro. M.",
""
],
[
"Muhlleitner",
"Margarete",
""
],
[
"Santos",
"Rui",
""
]
] |
We present a comprehensive study on Higgs pair production in various archetypical extended Higgs sectors such as the real and the complex 2-Higgs-Doublet Model, the 2-Higgs-Doublet Model augmented by a real singlet field and the Next-to-Minimal Supersymmetric extension of the Standard Model. We take into account all relevant theoretical and experimental constraints, in particular the experimental limits on non-resonant and resonant Higgs pair production. We present the allowed cross sections for Standard Model (SM)-like Higgs pair production and the ranges of the SM-like Yukawa and trilinear Higgs self-coupling that are still compatible with the applied constraints. Furthermore, we give results for the pair production of a SM-like with a non-SM-like Higgs boson and for the production of a pair of non-SM-like Higgs bosons. We find that di-Higgs production in the models under investigation can exceed the SM rate substantially, not only in the non-resonance region but also due to resonant enhancement. We give several benchmarks with interesting features such as large cross sections, the possibility to test CP violation, Higgs-to-Higgs cascade decays or di-Higgs production beating single Higgs production. In all of our benchmark points, the next-to-leading order QCD corrections are included in the large top-mass limit. For these points, we found that, depending on the model and the Higgs pair final state, the corrections increase the leading order cross section by a factor of 1.79 to 2.24. We also discuss the relation between the description of Higgs pair production in an effective field theory approach and in the specific models investigated here.
|
hep-ph/9302290
| null |
Christopher D. Carone
|
Double Beta Decay with Vector Majorons
|
6 pages (LaTeX, with the macro HUTP.sty included), 1 Topdrawer figure
not included, available upon request, Harvard University Preprint
HUTP-93/A007
|
Phys.Lett. B308 (1993) 85-88
|
10.1016/0370-2693(93)90605-H
| null |
hep-ph
| null |
We consider the possibility that neutrinoless double beta decay may occur in
models with unbroken lepton number via the emission of a massive gauge boson
with electron lepton number $-2$. We determine the shape of the $\beta\,\beta$
sum energy spectrum as a function of the gauge coupling, independent of
model-specific details. We discuss our results in light of the persistent
experimental claims that excess events are observed near but below the spectrum
endpoint of several elements.
|
[
{
"created": "Mon, 22 Feb 1993 19:41:38 GMT",
"version": "v1"
}
] |
2009-10-22
|
[
[
"Carone",
"Christopher D.",
""
]
] |
We consider the possibility that neutrinoless double beta decay may occur in models with unbroken lepton number via the emission of a massive gauge boson with electron lepton number $-2$. We determine the shape of the $\beta\,\beta$ sum energy spectrum as a function of the gauge coupling, independent of model-specific details. We discuss our results in light of the persistent experimental claims that excess events are observed near but below the spectrum endpoint of several elements.
|
hep-ph/0208247
|
Spencer Wheaton
|
J. Cleymans, B. Kampfer, S. Wheaton
|
Towards strangeness saturation in central heavy-ion collisions at high
energies
|
4 pages, 2 figures. Presented at the 16th International Conference on
Ultra-Relativistic Nucleus-Nucleus Collisions, Nantes, France, 18-24 July,
2002
|
Nucl.Phys.A715:553-556,2003
|
10.1016/S0375-9474(02)01517-8
| null |
hep-ph
| null |
Analyses of the centrality binned identified hadron multiplicities at SPS and
RHIC within the statistical-thermal model point to strangeness saturation with
increasing centrality and energy.
|
[
{
"created": "Tue, 27 Aug 2002 14:21:21 GMT",
"version": "v1"
}
] |
2008-11-26
|
[
[
"Cleymans",
"J.",
""
],
[
"Kampfer",
"B.",
""
],
[
"Wheaton",
"S.",
""
]
] |
Analyses of the centrality binned identified hadron multiplicities at SPS and RHIC within the statistical-thermal model point to strangeness saturation with increasing centrality and energy.
|
0910.0613
|
Wei Wang
|
Wei Wang and Cai-Dian L\"u
|
Distinguishing two kinds of scalar mesons from heavy meson decays
|
9 pages, 3 eps figures, published version
|
Phys.Rev.D82:034016,2010
|
10.1103/PhysRevD.82.034016
|
BARI-TH-09-614
|
hep-ph hep-ex
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
In the SU(3) symmetry limit, semileptonic $D^+\to Sl^+\nu$ and $B^-\to
Sl^-\bar\nu$ decays, with $S=a_0(980)$, $f_0(980)$ and $f_0(600)$, are found to
obey different sum rules in the $\bar qq$ and the tetra-quark descriptions for
scalar mesons. Thus these sum rules can distinguish the two scenarios for light
scalar mesons model-independently. This method also applies to the $\bar B^0\to
J/\psi(\eta_c) S$ decays. Two kinds of SU(3) symmetry breaking effects are
found to be under control, which will not spoil our method. The branching
fractions of the $D^+\to Sl^+\nu$, $B^-\to Sl^-\bar\nu$ and $\bar B^0\to
J/\psi(\eta_c) S$ decays roughly have the order $10^{-4}$, $10^{-5}$ and
$10^{-6}$, respectively. The ongoing BES-III and the forthcoming Super B
experiments are able to measure these channels and accordingly to provide
detailed information of the scalar meson inner structure.
|
[
{
"created": "Sun, 4 Oct 2009 15:38:39 GMT",
"version": "v1"
},
{
"created": "Mon, 16 Aug 2010 04:40:46 GMT",
"version": "v2"
}
] |
2014-11-20
|
[
[
"Wang",
"Wei",
""
],
[
"Lü",
"Cai-Dian",
""
]
] |
In the SU(3) symmetry limit, semileptonic $D^+\to Sl^+\nu$ and $B^-\to Sl^-\bar\nu$ decays, with $S=a_0(980)$, $f_0(980)$ and $f_0(600)$, are found to obey different sum rules in the $\bar qq$ and the tetra-quark descriptions for scalar mesons. Thus these sum rules can distinguish the two scenarios for light scalar mesons model-independently. This method also applies to the $\bar B^0\to J/\psi(\eta_c) S$ decays. Two kinds of SU(3) symmetry breaking effects are found to be under control, which will not spoil our method. The branching fractions of the $D^+\to Sl^+\nu$, $B^-\to Sl^-\bar\nu$ and $\bar B^0\to J/\psi(\eta_c) S$ decays roughly have the order $10^{-4}$, $10^{-5}$ and $10^{-6}$, respectively. The ongoing BES-III and the forthcoming Super B experiments are able to measure these channels and accordingly to provide detailed information of the scalar meson inner structure.
|
hep-ph/0501264
|
Tianjun Li
|
Ilia Gogoladze, Tianjun Li, Yukihiro Mimura, S. Nandi
|
Orbifold Unification for the Gauge and Higgs Fields and Their Couplings
|
RevTex4, 5 pages, 3 figures, version to appear in PLB
|
Phys.Lett.B622:320-326,2005
|
10.1016/j.physletb.2005.06.090
| null |
hep-ph hep-th
| null |
We present an orbifold GUT model in which the NMSSM Higgs trilinear couplings
are unified with the three Standard Model gauge couplings. The model is
constructed as an N=2 supersymmetric SU(8) gauge theory in six dimensions,
which is reduced to the NMSSM with extra U(1) factors upon compactification.
Such an unification is in good agreement with experiments. The predicted upper
limit for the lightest CP-even neutral Higgs boson is somewhat larger than in
the MSSM, and can be tested in the upcoming Large Hadron Collider.
|
[
{
"created": "Fri, 28 Jan 2005 06:27:52 GMT",
"version": "v1"
},
{
"created": "Sat, 20 Aug 2005 03:21:24 GMT",
"version": "v2"
}
] |
2010-11-05
|
[
[
"Gogoladze",
"Ilia",
""
],
[
"Li",
"Tianjun",
""
],
[
"Mimura",
"Yukihiro",
""
],
[
"Nandi",
"S.",
""
]
] |
We present an orbifold GUT model in which the NMSSM Higgs trilinear couplings are unified with the three Standard Model gauge couplings. The model is constructed as an N=2 supersymmetric SU(8) gauge theory in six dimensions, which is reduced to the NMSSM with extra U(1) factors upon compactification. Such an unification is in good agreement with experiments. The predicted upper limit for the lightest CP-even neutral Higgs boson is somewhat larger than in the MSSM, and can be tested in the upcoming Large Hadron Collider.
|
1312.3319
|
Lewis Tunstall
|
R.J. Crewther and Lewis C. Tunstall
|
$\Delta I=1/2$ rule for kaon decays derived from QCD infrared fixed
point
|
20 pages, 11 figures. This article is an expanded version of the
letter arXiv:1203.1321 (2012). v4: Fig. 1 moved to second page to match PRD
formatting, minor changes to text and references
|
Phys. Rev. D 91, 034016 (2015)
|
10.1103/PhysRevD.91.034016
|
ADP-12-09/T776
|
hep-ph hep-lat nucl-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
This article gives details of our proposal to replace ordinary chiral
$SU(3)_L\times SU(3)_R$ perturbation theory $\chi$PT$_3$ by 3-flavor
chiral-scale perturbation theory $\chi$PT$_\sigma$. In $\chi$PT$_\sigma$,
amplitudes are expanded at low energies and small $u,d,s$ quark masses about an
infrared fixed point $\alpha^{}_\mathrm{IR}$ of 3-flavor QCD. At
$\alpha^{}_\mathrm{IR}$, the quark condensate $\langle
\bar{q}q\rangle_{\mathrm{vac}} \not= 0$ induces nine Nambu-Goldstone bosons:
$\pi, K, \eta$ and a $0^{++}$ QCD dilaton $\sigma$. Physically, $\sigma$
appears as the $f_{0}(500)$ resonance, a pole at a complex mass with real part
$\lesssim m_K$. The $\Delta I=1/2$ rule for nonleptonic $K$-decays is then a
consequence of $\chi$PT$_\sigma$, with a $K_S\sigma$ coupling fixed by data for
$\gamma\gamma\rightarrow\pi\pi$ and $K_{S} \to \gamma\gamma$. We estimate
$R_\mathrm{IR} \approx 5$ for the nonperturbative Drell-Yan ratio $R =
\sigma(e^{+}e^{-}\rightarrow\mathrm{hadrons})/
\sigma(e^{+}e^{-}\rightarrow\mu^{+}\mu^{-})$ at $\alpha^{}_\mathrm{IR}$, and
show that, in the many-color limit, $\sigma/f_0$ becomes a narrow $q\bar{q}$
state with planar-gluon corrections. Rules for the order of terms in
$\chi$PT$_\sigma$ loop expansions are derived in Appendix A, and extended in
Appendix B to include inverse-power Li-Pagels singularities due to external
operators. This relates to an observation that, for $\gamma\gamma$ channels,
partial conservation of the dilatation current is not equivalent to
$\sigma$-pole dominance.
|
[
{
"created": "Wed, 11 Dec 2013 21:00:02 GMT",
"version": "v1"
},
{
"created": "Tue, 14 Jan 2014 16:27:32 GMT",
"version": "v2"
},
{
"created": "Fri, 14 Nov 2014 23:13:03 GMT",
"version": "v3"
},
{
"created": "Tue, 24 Feb 2015 17:49:10 GMT",
"version": "v4"
}
] |
2015-02-25
|
[
[
"Crewther",
"R. J.",
""
],
[
"Tunstall",
"Lewis C.",
""
]
] |
This article gives details of our proposal to replace ordinary chiral $SU(3)_L\times SU(3)_R$ perturbation theory $\chi$PT$_3$ by 3-flavor chiral-scale perturbation theory $\chi$PT$_\sigma$. In $\chi$PT$_\sigma$, amplitudes are expanded at low energies and small $u,d,s$ quark masses about an infrared fixed point $\alpha^{}_\mathrm{IR}$ of 3-flavor QCD. At $\alpha^{}_\mathrm{IR}$, the quark condensate $\langle \bar{q}q\rangle_{\mathrm{vac}} \not= 0$ induces nine Nambu-Goldstone bosons: $\pi, K, \eta$ and a $0^{++}$ QCD dilaton $\sigma$. Physically, $\sigma$ appears as the $f_{0}(500)$ resonance, a pole at a complex mass with real part $\lesssim m_K$. The $\Delta I=1/2$ rule for nonleptonic $K$-decays is then a consequence of $\chi$PT$_\sigma$, with a $K_S\sigma$ coupling fixed by data for $\gamma\gamma\rightarrow\pi\pi$ and $K_{S} \to \gamma\gamma$. We estimate $R_\mathrm{IR} \approx 5$ for the nonperturbative Drell-Yan ratio $R = \sigma(e^{+}e^{-}\rightarrow\mathrm{hadrons})/ \sigma(e^{+}e^{-}\rightarrow\mu^{+}\mu^{-})$ at $\alpha^{}_\mathrm{IR}$, and show that, in the many-color limit, $\sigma/f_0$ becomes a narrow $q\bar{q}$ state with planar-gluon corrections. Rules for the order of terms in $\chi$PT$_\sigma$ loop expansions are derived in Appendix A, and extended in Appendix B to include inverse-power Li-Pagels singularities due to external operators. This relates to an observation that, for $\gamma\gamma$ channels, partial conservation of the dilatation current is not equivalent to $\sigma$-pole dominance.
|
1206.0552
|
Yutaka Hosotani
|
Yutaka Hosotani
|
Gauge-Higgs Unification Approach
|
6 pages, 5 figures. Proceeding for GUT 2012, Kyoto, 15-17 March 2012.
A few references added
| null |
10.1063/1.4742101
|
OU-HET 751/2012
|
hep-ph hep-lat
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
When the extra dimensional space is not simply-connected, dynamics of the AB
phase in the extra dimension can induce dynamical gauge symmetry breaking by
the Hosotani mechanism. This opens up a new way of achieving unification of
gauge forces. It leads to the gauge-Higgs unification. The Hosotani mechanism
can be established nonperturbatively by lattice simulations, in which
measurements of the Polyakov line give a clue.
|
[
{
"created": "Mon, 4 Jun 2012 09:07:26 GMT",
"version": "v1"
},
{
"created": "Fri, 8 Jun 2012 11:27:07 GMT",
"version": "v2"
}
] |
2015-06-05
|
[
[
"Hosotani",
"Yutaka",
""
]
] |
When the extra dimensional space is not simply-connected, dynamics of the AB phase in the extra dimension can induce dynamical gauge symmetry breaking by the Hosotani mechanism. This opens up a new way of achieving unification of gauge forces. It leads to the gauge-Higgs unification. The Hosotani mechanism can be established nonperturbatively by lattice simulations, in which measurements of the Polyakov line give a clue.
|
hep-ph/0101322
|
Marcus Mauser
|
M. Fischer, S. Groote, J.G. K\"orner, M.C. Mauser
|
Complete angular analysis of polarized top decay at O(alpha_s)
|
61 pages, 11 postscript figures added, typos corrected, revisions and
extensions, figures added
|
Phys.Rev.D65:054036,2002
|
10.1103/PhysRevD.65.054036
|
MZ-TH/99-10
|
hep-ph
| null |
We calculate the O(alpha_s) radiative corrections to the three spin
independent and five spin dependent structure functions that describe the
angular decay distribution in the decay of a polarized top quark into a W-boson
(followed by the decay W^{+} -> l^{+} + nu_l or by W^{+} -> anti-q + q and a
bottom quark. The angular decay distribution is described in cascade fashion,
i.e. the decay t(uparrow) -> W^{+} + X_b is analyzed in the top rest system
while the subsequent decay W^{+} -> l^{+} + nu_l (or W^{+} -> anti-q + q) is
analyzed in the W rest frame. We present our results for the eight O(alpha_s)
integrated structure functions in analytical form keeping the mass of the
bottom quark finite. In the limit m_b -> 0 the structure function expressions
reduce to rather compact forms.
|
[
{
"created": "Mon, 29 Jan 2001 15:01:27 GMT",
"version": "v1"
},
{
"created": "Thu, 20 Sep 2001 11:37:34 GMT",
"version": "v2"
},
{
"created": "Wed, 10 Oct 2001 10:58:02 GMT",
"version": "v3"
}
] |
2011-03-23
|
[
[
"Fischer",
"M.",
""
],
[
"Groote",
"S.",
""
],
[
"Körner",
"J. G.",
""
],
[
"Mauser",
"M. C.",
""
]
] |
We calculate the O(alpha_s) radiative corrections to the three spin independent and five spin dependent structure functions that describe the angular decay distribution in the decay of a polarized top quark into a W-boson (followed by the decay W^{+} -> l^{+} + nu_l or by W^{+} -> anti-q + q and a bottom quark. The angular decay distribution is described in cascade fashion, i.e. the decay t(uparrow) -> W^{+} + X_b is analyzed in the top rest system while the subsequent decay W^{+} -> l^{+} + nu_l (or W^{+} -> anti-q + q) is analyzed in the W rest frame. We present our results for the eight O(alpha_s) integrated structure functions in analytical form keeping the mass of the bottom quark finite. In the limit m_b -> 0 the structure function expressions reduce to rather compact forms.
|
2311.11660
|
Andreas Ringwald
|
Andreas Ringwald
|
Axion dark matter (theory & experiment)
|
11 pages, 5 figures, contribution to the proceedings of the XVIII
International Conference on Topics in Astroparticle and Underground Physics
(TAUP2023)
| null | null |
DESY-23-190
|
hep-ph
|
http://creativecommons.org/licenses/by/4.0/
|
We review the motivation for the axion as a solution of the strong CP puzzle
and as a candidate for cold dark matter. Then we discuss benchmark axion models
and present their predictions concerning axion couplings to the Standard Model
and axion dark matter abundance. Finally, we give an overview on the discovery
potential of current and planned axion experiments, reaching from axion dark
matter direct detection, over searches for solar axions, to direct production
and detection of axions in the laboratory.
|
[
{
"created": "Mon, 20 Nov 2023 10:50:47 GMT",
"version": "v1"
}
] |
2023-11-21
|
[
[
"Ringwald",
"Andreas",
""
]
] |
We review the motivation for the axion as a solution of the strong CP puzzle and as a candidate for cold dark matter. Then we discuss benchmark axion models and present their predictions concerning axion couplings to the Standard Model and axion dark matter abundance. Finally, we give an overview on the discovery potential of current and planned axion experiments, reaching from axion dark matter direct detection, over searches for solar axions, to direct production and detection of axions in the laboratory.
|
hep-ph/0108125
|
Gert Aarts
|
Gert Aarts (Heidelberg)
|
Spectral function at high temperature in the classical approximation
|
13 pages with 4 eps figures, minor changes; to appear in Phys.Lett.B
|
Phys.Lett. B518 (2001) 315-322
|
10.1016/S0370-2693(01)01081-4
|
HD-THEP-01-33
|
hep-ph hep-lat hep-th
| null |
At high temperature the infrared modes of a weakly coupled quantum field
theory can be treated nonperturbatively in real time using the classical field
approximation. We use this to introduce a nonperturbative approach to the
calculation of finite-temperature spectral functions, employing the classical
KMS condition in real time. The method is illustrated for the one-particle
spectral function in a scalar field theory in 2+1 dimensions. The result is
compared with resummed two-loop perturbation theory and both the plasmon mass
and width are found to agree with the analytical prediction.
|
[
{
"created": "Wed, 15 Aug 2001 10:21:59 GMT",
"version": "v1"
},
{
"created": "Fri, 31 Aug 2001 08:08:32 GMT",
"version": "v2"
}
] |
2009-11-07
|
[
[
"Aarts",
"Gert",
"",
"Heidelberg"
]
] |
At high temperature the infrared modes of a weakly coupled quantum field theory can be treated nonperturbatively in real time using the classical field approximation. We use this to introduce a nonperturbative approach to the calculation of finite-temperature spectral functions, employing the classical KMS condition in real time. The method is illustrated for the one-particle spectral function in a scalar field theory in 2+1 dimensions. The result is compared with resummed two-loop perturbation theory and both the plasmon mass and width are found to agree with the analytical prediction.
|
1505.03729
|
Junichiro Kawamura
|
Hiroyuki Abe, Junichiro Kawamura and Yuji Omura
|
LHC phenomenology of natural MSSM with non-universal gaugino masses at
the unification scale
|
15 pages, 5 figures, 1 table; added references and clarifications
| null |
10.1007/JHEP08(2015)089
| null |
hep-ph hep-ex
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
In this letter, we study collider phenomenology in the supersymmetric
Standard Model with a certain type of non-universal gaugino masses at the gauge
coupling unification scale, motivated by the little hierarchy problem. In this
scenario, especially the wino mass is relatively large compared to the gluino
mass at the unification scale, and the heavy wino can relax the fine-tuning of
the higgsino mass parameter, so-called $\mu$-parameter. Besides, it will
enhance the lightest Higgs boson mass due to the relatively large left-right
mixing of top squarks through the renormalization group (RG) effect. Then $125$
GeV Higgs boson could be accomplished, even if the top squarks are lighter than
$1$ TeV and the $\mu$ parameter is within a few hundreds GeV. The right-handed
top squark tends to be lighter than the other sfermions due to the RG runnings,
then we focus on the top squark search at the LHC. Since the top squark is
almost right-handed and the higgsinos are nearly degenerate, $2b + E_T^{\rm
miss}$ channel is the most sensitive to this scenario. We figure out current
and expected experimental bounds on the lightest top squark mass and model
parameters at the gauge coupling unification scale.
|
[
{
"created": "Thu, 14 May 2015 14:06:06 GMT",
"version": "v1"
},
{
"created": "Mon, 25 May 2015 12:45:37 GMT",
"version": "v2"
},
{
"created": "Fri, 17 Jul 2015 12:57:45 GMT",
"version": "v3"
}
] |
2015-09-30
|
[
[
"Abe",
"Hiroyuki",
""
],
[
"Kawamura",
"Junichiro",
""
],
[
"Omura",
"Yuji",
""
]
] |
In this letter, we study collider phenomenology in the supersymmetric Standard Model with a certain type of non-universal gaugino masses at the gauge coupling unification scale, motivated by the little hierarchy problem. In this scenario, especially the wino mass is relatively large compared to the gluino mass at the unification scale, and the heavy wino can relax the fine-tuning of the higgsino mass parameter, so-called $\mu$-parameter. Besides, it will enhance the lightest Higgs boson mass due to the relatively large left-right mixing of top squarks through the renormalization group (RG) effect. Then $125$ GeV Higgs boson could be accomplished, even if the top squarks are lighter than $1$ TeV and the $\mu$ parameter is within a few hundreds GeV. The right-handed top squark tends to be lighter than the other sfermions due to the RG runnings, then we focus on the top squark search at the LHC. Since the top squark is almost right-handed and the higgsinos are nearly degenerate, $2b + E_T^{\rm miss}$ channel is the most sensitive to this scenario. We figure out current and expected experimental bounds on the lightest top squark mass and model parameters at the gauge coupling unification scale.
|
hep-ph/9510430
|
Gennaro Miele
|
G. Mangano, G. Miele and G. Migliore
|
Quantum statistics and Altarelli-Parisi evolution equations
|
19 pages, plain LaTeX, + 4 figures uuencoded
|
Nuovo Cim.A108:867-882,1995
|
10.1007/BF02731027
|
published in Nuovo Cimento A108 (1995) 867-882
|
hep-ph
| null |
The phenomenological evidence of quantum statistical effects in parton
physics is here briefly summarized, and the recent good results obtained by
parameterizing the parton distributions in terms of Fermi-Dirac and
Bose-Einstein statistical functions are discussed. In this framework we study
the modification of the scaling behaviour of parton distributions due to
quantum statistical effects. In particular, by following a well-known formal
analogy which holds between the Altarelli-Parisi evolution equations, at
leading-log approximation, and a set of Boltzmann equations, we suggest a
generalization of evolution equations to take into account Pauli exclusion
principle and gluon induced emission.
|
[
{
"created": "Fri, 27 Oct 1995 10:54:50 GMT",
"version": "v1"
}
] |
2014-11-17
|
[
[
"Mangano",
"G.",
""
],
[
"Miele",
"G.",
""
],
[
"Migliore",
"G.",
""
]
] |
The phenomenological evidence of quantum statistical effects in parton physics is here briefly summarized, and the recent good results obtained by parameterizing the parton distributions in terms of Fermi-Dirac and Bose-Einstein statistical functions are discussed. In this framework we study the modification of the scaling behaviour of parton distributions due to quantum statistical effects. In particular, by following a well-known formal analogy which holds between the Altarelli-Parisi evolution equations, at leading-log approximation, and a set of Boltzmann equations, we suggest a generalization of evolution equations to take into account Pauli exclusion principle and gluon induced emission.
|
0712.2612
|
Wei Chao
|
Wei Chao, Shu Luo, Zhi-zhong Xing and Shun Zhou
|
TeV-scale Type-II Seesaw Models and Possible Collider Signatures
|
4 pages. Talk given by Wei Chao at the 4th International Conference
on Flavor Physics, 24-28 September 2007, Beijing (to appear in the
proceedings)
|
Int.J.Mod.Phys.A23:3420-3424,2008
|
10.1142/S0217751X08042249
| null |
hep-ph
| null |
A natural extension of the standard model to accommodate massive neutrinos is
to introduce one Higgs triplet and three right-handed Majorana neutrinos,
leading to a 6 \times6 neutrino mass matrix. We show that three light Majorana
neutrinos (i.e., the mass eigenstates of \nu_e, \nu_\mu and \nu_\tau) are
exactly massless, if and only if M_L = M_D M^{-1}_R M^T_D exactly holds in this
seesaw model. We propose three simple Type-II seesaw scenarios with broken A_4
\times U(1)_X flavor symmetry to interpret the observed neutrino mass spectrum
and neutrino mixing pattern. Such a TeV-scale neutrino model can be tested in
two complementary ways: (1) searching for possible collider signatures of
lepton number violation induced by the right-handed Majorana neutrinos and
doubly-charged Higgs particles; and (2) searching for possible consequences of
unitarity violation of the 3\times 3 neutrino mixing matrix in the future
long-baseline neutrino oscillation experiments.
|
[
{
"created": "Mon, 17 Dec 2007 01:47:44 GMT",
"version": "v1"
}
] |
2008-11-26
|
[
[
"Chao",
"Wei",
""
],
[
"Luo",
"Shu",
""
],
[
"Xing",
"Zhi-zhong",
""
],
[
"Zhou",
"Shun",
""
]
] |
A natural extension of the standard model to accommodate massive neutrinos is to introduce one Higgs triplet and three right-handed Majorana neutrinos, leading to a 6 \times6 neutrino mass matrix. We show that three light Majorana neutrinos (i.e., the mass eigenstates of \nu_e, \nu_\mu and \nu_\tau) are exactly massless, if and only if M_L = M_D M^{-1}_R M^T_D exactly holds in this seesaw model. We propose three simple Type-II seesaw scenarios with broken A_4 \times U(1)_X flavor symmetry to interpret the observed neutrino mass spectrum and neutrino mixing pattern. Such a TeV-scale neutrino model can be tested in two complementary ways: (1) searching for possible collider signatures of lepton number violation induced by the right-handed Majorana neutrinos and doubly-charged Higgs particles; and (2) searching for possible consequences of unitarity violation of the 3\times 3 neutrino mixing matrix in the future long-baseline neutrino oscillation experiments.
|
2107.08451
|
Pablo G. Ortega
|
Pablo G. Ortega, David R. Entem, Francisco Fernandez
|
Symmetries, partners and thresholds: the case of the $X_b$
|
9 pages, 6 figures, 6 tables
| null | null | null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
The discovery of the $X(3872)$ meant the revival of the heavy meson
spectroscopy beyond naive $q\bar q$ structures. Once that the $SU(3)$ scheme,
which was very useful in the dawn of the quark models, does not work for these
states, one has to use new symmetries, like Heavy Quark Spin Symmetry (HQSS)
and Heavy Flavor Symmetry (HFS), to look for new states. However, at the energy
regions where these new states appear, new factors are involved and it is not
straightforward to relate the predictions of the symmetries with the data. In
this work, we present a critical analysis of this problem and show, in a
coupled-channels model, how the relative position of the bare $Q\bar Q$ states
with respect to meson-meson thresholds and the coupling with other channels
modulate the strength of the interaction and, hence, modify the structure of
the predicted states. We found a possible candidate to the $X(3872)$ partner at
$10599$ MeV$/c^2$.
|
[
{
"created": "Sun, 18 Jul 2021 13:54:56 GMT",
"version": "v1"
}
] |
2021-07-20
|
[
[
"Ortega",
"Pablo G.",
""
],
[
"Entem",
"David R.",
""
],
[
"Fernandez",
"Francisco",
""
]
] |
The discovery of the $X(3872)$ meant the revival of the heavy meson spectroscopy beyond naive $q\bar q$ structures. Once that the $SU(3)$ scheme, which was very useful in the dawn of the quark models, does not work for these states, one has to use new symmetries, like Heavy Quark Spin Symmetry (HQSS) and Heavy Flavor Symmetry (HFS), to look for new states. However, at the energy regions where these new states appear, new factors are involved and it is not straightforward to relate the predictions of the symmetries with the data. In this work, we present a critical analysis of this problem and show, in a coupled-channels model, how the relative position of the bare $Q\bar Q$ states with respect to meson-meson thresholds and the coupling with other channels modulate the strength of the interaction and, hence, modify the structure of the predicted states. We found a possible candidate to the $X(3872)$ partner at $10599$ MeV$/c^2$.
|
1009.1947
|
Ryo Saito
|
Ryo Saito and Satoshi Shirai
|
Primordial Black Hole as a Source of the Boost Factor
|
17 pages, 3 figure
|
Phys.Lett.B697:95-100,2011
|
10.1016/j.physletb.2011.01.038
|
RESCEU-20/10, IPMU10-0154, UT-10-16
|
hep-ph astro-ph.CO
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Primordial black holes (PBHs) accumulate weakly interacting massive particles
(WIMPs) around them and form ultracompact minihalos (UCMHs), if the WIMP is a
dominant component of the dark matter (DM). In this paper, we discuss that the
UCMHs seeded by the PBHs with sub-earth mass enhance the WIMP annihilation in
the present Universe and can successfully explain the positron and/or electron
excess in cosmic ray observed by PAMELA/Fermi experiments. The signal is very
similar to that from a decaying dark matter, which can explain the PAMELA
and/or Fermi anomaly without conflict with any constraints as long as the decay
mode is proper. In this scenario, the boost factor can be as large as 10^5. In
addition, we discuss testability of our scenario by gamma-ray point source and
gravitational-wave experiments.
|
[
{
"created": "Fri, 10 Sep 2010 07:25:25 GMT",
"version": "v1"
}
] |
2011-02-15
|
[
[
"Saito",
"Ryo",
""
],
[
"Shirai",
"Satoshi",
""
]
] |
Primordial black holes (PBHs) accumulate weakly interacting massive particles (WIMPs) around them and form ultracompact minihalos (UCMHs), if the WIMP is a dominant component of the dark matter (DM). In this paper, we discuss that the UCMHs seeded by the PBHs with sub-earth mass enhance the WIMP annihilation in the present Universe and can successfully explain the positron and/or electron excess in cosmic ray observed by PAMELA/Fermi experiments. The signal is very similar to that from a decaying dark matter, which can explain the PAMELA and/or Fermi anomaly without conflict with any constraints as long as the decay mode is proper. In this scenario, the boost factor can be as large as 10^5. In addition, we discuss testability of our scenario by gamma-ray point source and gravitational-wave experiments.
|
1109.5619
|
Grigory Ovanesyan
|
Grigory Ovanesyan and Ivan Vitev
|
Medium-induced parton splitting kernels from Soft Collinear Effective
Theory with Glauber gluons
|
9 pages, 3 figures
|
Physics Letters B, Volume 706, Issues 4-5, 5 January 2012, Pages
371-378
|
10.1016/j.physletb.2011.11.040
| null |
hep-ph nucl-ex nucl-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We derive the splitting kernels for partons produced in large $Q^2$
scattering processes that subsequently traverse a region of
strongly-interacting matter using a recently-developed effective theory \SCETG.
We include all corrections beyond the small-$x$ approximation, consistent with
the power counting of \SCETG. We demonstrate how medium recoil, geometry and
expansion scenarios, and phase space cuts can be implemented numerically for
phenomenological applications. For the simplified case of infinite transverse
momentum kinematics and a uniform medium, we provide closed-form analytic
results that can be used to validate the numerical simulations.
|
[
{
"created": "Mon, 26 Sep 2011 15:55:20 GMT",
"version": "v1"
},
{
"created": "Fri, 16 Dec 2011 16:41:52 GMT",
"version": "v2"
}
] |
2015-05-30
|
[
[
"Ovanesyan",
"Grigory",
""
],
[
"Vitev",
"Ivan",
""
]
] |
We derive the splitting kernels for partons produced in large $Q^2$ scattering processes that subsequently traverse a region of strongly-interacting matter using a recently-developed effective theory \SCETG. We include all corrections beyond the small-$x$ approximation, consistent with the power counting of \SCETG. We demonstrate how medium recoil, geometry and expansion scenarios, and phase space cuts can be implemented numerically for phenomenological applications. For the simplified case of infinite transverse momentum kinematics and a uniform medium, we provide closed-form analytic results that can be used to validate the numerical simulations.
|
1009.5154
|
Yoshimasa Hidaka
|
Yoshimasa Hidaka and Teiji Kunihiro
|
Renormalized Linear Kinetic Theory as Derived from Quantum Field Theory
- a novel diagrammatic method for computing transport coefficients -
|
17 pages, 10 figures; abstract modified, Sec IV D added
|
Phys.Rev.D83:076004,2011
|
10.1103/PhysRevD.83.076004
|
KUNS-2301
|
hep-ph cond-mat.stat-mech nucl-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We propose a novel diagrammatic method for computing transport coefficients
in relativistic quantum field theory. The self-consistent equation for summing
the diagrams with pinch singularities has a form of a linearized kinetic
equation as usual, but our formalism enables us to incorporate higher-order
corrections of the coupling systematically for the first time. Furthermore, it
is clarified that the higher-order corrections are nicely summarized into that
of the vertex function, spectral function, and collision term. We identify the
diagrams up to the next-to-next-leading order corrections in the weak coupling
expansion of phi^4 theory, which is a difficult task in kinetic approaches and
other diagrammatic methods.
|
[
{
"created": "Mon, 27 Sep 2010 04:14:51 GMT",
"version": "v1"
},
{
"created": "Sun, 17 Oct 2010 08:29:19 GMT",
"version": "v2"
},
{
"created": "Fri, 25 Feb 2011 01:12:23 GMT",
"version": "v3"
}
] |
2011-04-22
|
[
[
"Hidaka",
"Yoshimasa",
""
],
[
"Kunihiro",
"Teiji",
""
]
] |
We propose a novel diagrammatic method for computing transport coefficients in relativistic quantum field theory. The self-consistent equation for summing the diagrams with pinch singularities has a form of a linearized kinetic equation as usual, but our formalism enables us to incorporate higher-order corrections of the coupling systematically for the first time. Furthermore, it is clarified that the higher-order corrections are nicely summarized into that of the vertex function, spectral function, and collision term. We identify the diagrams up to the next-to-next-leading order corrections in the weak coupling expansion of phi^4 theory, which is a difficult task in kinetic approaches and other diagrammatic methods.
|
2402.00770
|
Sebastian Jaskiewicz
|
Sebastian Jaskiewicz
|
Lightcone expansion beyond leading power
|
Extended version of the contribution to Matter To The Deepest: Recent
Developments In Physics Of Fundamental Interactions XLV International
Conference of Theoretical Physics, 2023
| null | null | null |
hep-ph
|
http://creativecommons.org/licenses/by/4.0/
|
We discuss recent developments in descriptions of processes using power
expansion around the lightcone within Soft-Collinear Effective Theory. First,
we present an overview of the systematically improvable framework that enables
factorization of high-energy scattering processes beyond leading power in the
expansion in ratios of energy scales. As an illustration of the relevant
concepts, we describe the recently derived factorization theorem for the
off-diagonal channel of the Drell-Yan production process at threshold. This
example exposes endpoint divergences appearing in convolution integrals in
factorization formulas. Lastly, we discuss the solution to these complications
developed in the context of ''gluon thrust'' in $e^+e^-$ collisions.
|
[
{
"created": "Thu, 1 Feb 2024 16:59:47 GMT",
"version": "v1"
}
] |
2024-02-02
|
[
[
"Jaskiewicz",
"Sebastian",
""
]
] |
We discuss recent developments in descriptions of processes using power expansion around the lightcone within Soft-Collinear Effective Theory. First, we present an overview of the systematically improvable framework that enables factorization of high-energy scattering processes beyond leading power in the expansion in ratios of energy scales. As an illustration of the relevant concepts, we describe the recently derived factorization theorem for the off-diagonal channel of the Drell-Yan production process at threshold. This example exposes endpoint divergences appearing in convolution integrals in factorization formulas. Lastly, we discuss the solution to these complications developed in the context of ''gluon thrust'' in $e^+e^-$ collisions.
|
hep-ph/9210279
| null |
Biswarup Mukhopadhyaya and D.P. Roy
|
Tevatron Mass Limits for Heavy Quarks Decaying via Flavor Changing
Neutral Current
|
13 pages, TIFR/TH/92-58, Two figures to be supplied on request
|
Phys.Rev.D48:2105-2109,1993
|
10.1103/PhysRevD.48.2105
| null |
hep-ph
| null |
The dimuon and dielectron data from the Tevatron $\bar pp$ collider are used
to probe for heavy quarks, which decay dominantly via flavour changing neutral
current. Depending on whether the $FCNC$ decay occurs at the tree or loop
level, one gets a lower mass limit of 85 or 75 GeV. The former applies to
singlet, vector doublet and mirror type quarks while the latter applies to a
lefthanded quark doublet of the fourth generation.
|
[
{
"created": "Fri, 30 Oct 1992 09:43:00 GMT",
"version": "v1"
}
] |
2008-11-26
|
[
[
"Mukhopadhyaya",
"Biswarup",
""
],
[
"Roy",
"D. P.",
""
]
] |
The dimuon and dielectron data from the Tevatron $\bar pp$ collider are used to probe for heavy quarks, which decay dominantly via flavour changing neutral current. Depending on whether the $FCNC$ decay occurs at the tree or loop level, one gets a lower mass limit of 85 or 75 GeV. The former applies to singlet, vector doublet and mirror type quarks while the latter applies to a lefthanded quark doublet of the fourth generation.
|
hep-ph/9602273
|
Arnd Brandenburg
|
W. Bernreuther, A. Brandenburg(RWTH Aachen), P. Overmann
(Universit\"at Heidelberg)
|
CP Nonconservation in Top Quark Production by (Un) Polarized $e^+e^-$
and $\gamma \gamma$ Collisions
|
8 pages, LaTeX; 3 postscript figures, epsf macro included;
Contribution to the Workshop on $e^+e^-$ Linear Colliders; Annecy, Assergi,
Hamburg, Febr. - Sept. 1995
| null | null |
PITHA 96/02
|
hep-ph
| null |
We report on an investigation of CP violation in (un)polarized
$e^+e^-\to{\bar t}t$ resulting from an extended neutral Higgs sector or from
the minimal SUSY extension of the Standard Model (SM). We consider c.m.
energies from the ${\bar t}t$ threshold to the TeV range. In addition
sensitivity estimates for CP-violating form factors of the top quark are made.
Further we discuss the prospects of probing Higgs sector CP violationin
$\gamma\gamma\to{\bar t}t$.
|
[
{
"created": "Mon, 12 Feb 1996 11:14:05 GMT",
"version": "v1"
}
] |
2007-05-23
|
[
[
"Bernreuther",
"W.",
"",
"RWTH Aachen"
],
[
"Brandenburg",
"A.",
"",
"RWTH Aachen"
],
[
"Overmann",
"P.",
"",
"Universität Heidelberg"
]
] |
We report on an investigation of CP violation in (un)polarized $e^+e^-\to{\bar t}t$ resulting from an extended neutral Higgs sector or from the minimal SUSY extension of the Standard Model (SM). We consider c.m. energies from the ${\bar t}t$ threshold to the TeV range. In addition sensitivity estimates for CP-violating form factors of the top quark are made. Further we discuss the prospects of probing Higgs sector CP violationin $\gamma\gamma\to{\bar t}t$.
|
1412.5157
|
Jonas Michael Lindert
|
Stefan Kallweit, Jonas M. Lindert, Philipp Maierh\"ofer, Stefano
Pozzorini, Marek Sch\"onherr
|
NLO electroweak automation and precise predictions for W+multijet
production at the LHC
|
46 pages, 23 Figures; V2: Original results unchanged. Extra plots on
electroweak and photon-induced Born contributions added. References added.
Various minor modifications. Version accepted for publication in JHEP
| null | null |
LPN14-127, IPPP/14/107, DCPT/14/214, MCNET-14-26, ZU-TH 42/14,
MITP/14-102
|
hep-ph hep-ex
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We present a fully automated implementation of next-to-leading order
electroweak (NLO EW) corrections in the OpenLoops matrix-element generator
combined with the Sherpa and Munich Monte Carlo frameworks. The
process-independent character of the implemented algorithms opens the door to
NLO QCD+EW simulations for a vast range of Standard Model processes, up to high
particle multiplicity, at current and future colliders. As a first application,
we present NLO QCD+EW predictions for the production of positively charged
on-shell W bosons in association with up to three jets at the Large Hadron
Collider. At the TeV energy scale, due to the presence of large Sudakov
logarithms, EW corrections reach the 20-40% level and play an important role
for searches of physics beyond the Standard Model. The dependence of NLO EW
effects on the jet multiplicity is investigated in detail, and we find that
W+multijet final states feature genuinely different EW effects as compared to
the case of W+1jet.
|
[
{
"created": "Tue, 16 Dec 2014 20:35:15 GMT",
"version": "v1"
},
{
"created": "Thu, 19 Mar 2015 14:48:42 GMT",
"version": "v2"
}
] |
2015-03-20
|
[
[
"Kallweit",
"Stefan",
""
],
[
"Lindert",
"Jonas M.",
""
],
[
"Maierhöfer",
"Philipp",
""
],
[
"Pozzorini",
"Stefano",
""
],
[
"Schönherr",
"Marek",
""
]
] |
We present a fully automated implementation of next-to-leading order electroweak (NLO EW) corrections in the OpenLoops matrix-element generator combined with the Sherpa and Munich Monte Carlo frameworks. The process-independent character of the implemented algorithms opens the door to NLO QCD+EW simulations for a vast range of Standard Model processes, up to high particle multiplicity, at current and future colliders. As a first application, we present NLO QCD+EW predictions for the production of positively charged on-shell W bosons in association with up to three jets at the Large Hadron Collider. At the TeV energy scale, due to the presence of large Sudakov logarithms, EW corrections reach the 20-40% level and play an important role for searches of physics beyond the Standard Model. The dependence of NLO EW effects on the jet multiplicity is investigated in detail, and we find that W+multijet final states feature genuinely different EW effects as compared to the case of W+1jet.
|
1311.2267
|
Gluza Janusz Dr
|
Andrea A. Almasy, Ievgen Dubovyk, J. Gluza and T. Riemann
|
Reductions and Contractions of 1-loop Tensor Feynman Integrals
|
Presented by I. Dubovyk and T. Riemann at the International
Conference of Theoretical Physics "Matter To The Deepest", Ustron 2013
| null | null |
LPN13-088
|
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We report on the progress in constructing contracted one-loop tensors.
Analytic results for rank R=4 tensors, cross-checked numerically, are presented
for the first time.
|
[
{
"created": "Sun, 10 Nov 2013 12:52:57 GMT",
"version": "v1"
}
] |
2013-11-12
|
[
[
"Almasy",
"Andrea A.",
""
],
[
"Dubovyk",
"Ievgen",
""
],
[
"Gluza",
"J.",
""
],
[
"Riemann",
"T.",
""
]
] |
We report on the progress in constructing contracted one-loop tensors. Analytic results for rank R=4 tensors, cross-checked numerically, are presented for the first time.
|
2303.15599
|
Stuart Raby
|
Stuart Raby and Junichiro Kawamura
|
Neutrinos in Global SU(5) F-theory Model
|
16 pages, 5 figures, Talk given at Corfu 2022, Workshop on the
Standard Model and Beyond
| null | null | null |
hep-ph hep-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
In this talk, given at Corfu 2022 Workshop on the Standard Model and Beyond,
I present work in collaboration with Junichiro
Kawamura,Ref.~[arXiv:2212.00840]. The talk is also based on a number of papers
on a Global $SU(5)$ F-theory GUT in collaboration with Herb Clemens. In the
model $SU(5)$ is broken to the MSSM via a Wilson line. This is accomplished
(without problems with vector-like exotics) by simultaneously describing the
F-theory model and its Heterotic dual. The model has a twin MSSM sector and
it's the neutrino sector of the field I consider in the talk.
|
[
{
"created": "Mon, 27 Mar 2023 21:09:08 GMT",
"version": "v1"
}
] |
2023-03-29
|
[
[
"Raby",
"Stuart",
""
],
[
"Kawamura",
"Junichiro",
""
]
] |
In this talk, given at Corfu 2022 Workshop on the Standard Model and Beyond, I present work in collaboration with Junichiro Kawamura,Ref.~[arXiv:2212.00840]. The talk is also based on a number of papers on a Global $SU(5)$ F-theory GUT in collaboration with Herb Clemens. In the model $SU(5)$ is broken to the MSSM via a Wilson line. This is accomplished (without problems with vector-like exotics) by simultaneously describing the F-theory model and its Heterotic dual. The model has a twin MSSM sector and it's the neutrino sector of the field I consider in the talk.
|
hep-ph/0212042
|
Pelaez
|
J. R. Pelaez (1,2) and A. Gomez Nicola (2). (1-INFN and U. Firenze,
Italy, 2-U. Complutense, Madrid. Spain)
|
Meson resonances from unitarized meson scattering at one loop in Chiral
Perturbation Theory
|
To appear in the proceedings of the 5th International Conference on
``Quark confinement and the hadron spectrum'', held in Gargnano, Garda Lake,
Italy. 10-14th September 2002. 3 pages
| null |
10.1142/9789812704269_0058
| null |
hep-ph nucl-th
| null |
We show the results for the scattering poles associated to the rho, f0, a0,
K*, sigma and kappa resonances in meson-meson scattering. Our amplitudes are
obtained from the complete one-loop meson-meson scattering amplitudes from
Chiral Perturbation Theory. Once unitarized with the Inverse Amplitude Method,
they describe remarkably well the data simultaneously in the low energy and
resonance regions up to 1.2 GeV, using low energy parameters compatible with
present determinations.
|
[
{
"created": "Tue, 3 Dec 2002 12:16:05 GMT",
"version": "v1"
}
] |
2017-08-23
|
[
[
"Pelaez",
"J. R.",
"",
"1-INFN and U. Firenze,\n Italy, 2-U. Complutense, Madrid. Spain"
],
[
"Nicola",
"A. Gomez",
"",
"1-INFN and U. Firenze,\n Italy, 2-U. Complutense, Madrid. Spain"
],
[
".",
"",
"",
"1-INFN and U. Firenze,\n Italy, 2-U. Complutense, Madrid. Spain"
]
] |
We show the results for the scattering poles associated to the rho, f0, a0, K*, sigma and kappa resonances in meson-meson scattering. Our amplitudes are obtained from the complete one-loop meson-meson scattering amplitudes from Chiral Perturbation Theory. Once unitarized with the Inverse Amplitude Method, they describe remarkably well the data simultaneously in the low energy and resonance regions up to 1.2 GeV, using low energy parameters compatible with present determinations.
|
0803.0787
|
Tadashi Yoshikawa
|
Keiichi Kimura, Akira Takamura, Tadashi Yoshikawa
|
Avoiding the uncertainty from correlation between |Delta m_{31}^2| and
CP phase delta in nu_mu --> nu_mu long baseline experiments
|
6 pages, 9 figures
|
Mod.Phys.Lett.A23:2997-3003,2008
|
10.1142/S0217732308028272
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We introduce a new index I_{Delta m_{31}^2} to find where is the better setup
of the baseline length and energy to avoid as well as possible the uncertainty
from the correlation between Delta m_{31}^2 and cos(delta) in nu_mu --> nu_mu
long baseline experiments.
|
[
{
"created": "Thu, 6 Mar 2008 04:33:06 GMT",
"version": "v1"
},
{
"created": "Fri, 6 Jun 2008 04:51:03 GMT",
"version": "v2"
}
] |
2008-12-25
|
[
[
"Kimura",
"Keiichi",
""
],
[
"Takamura",
"Akira",
""
],
[
"Yoshikawa",
"Tadashi",
""
]
] |
We introduce a new index I_{Delta m_{31}^2} to find where is the better setup of the baseline length and energy to avoid as well as possible the uncertainty from the correlation between Delta m_{31}^2 and cos(delta) in nu_mu --> nu_mu long baseline experiments.
|
1201.6204
|
Paride Paradisi
|
Gian Francesco Giudice, Gino Isidori, Paride Paradisi
|
Direct CP violation in charm and flavor mixing beyond the SM
|
30 pages, 6 figures
| null |
10.1007/JHEP04(2012)060
|
CERN-PH-TH/2012-017
|
hep-ph hep-ex
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We analyze possible interpretations of the recent LHCb evidence for CP
violation in D meson decays in terms of physics beyond the Standard Model. On
general grounds, models in which the primary source of flavor violation is
linked to the breaking of chiral symmetry (left-right flavor mixing) are
natural candidates to explain this effect, via enhanced chromomagnetic
operators. In the case of supersymmetric models, we identify two motivated
scenarios: disoriented A-terms and split families. These structures predict
other non-standard signals, such as nuclear EDMs close to their present bounds
and, possibly, tiny but visible deviations in K and B physics, or even sizable
flavor-violating processes involving the top quark or the stops. Some of these
connections, especially the one with nuclear EDMs, hold beyond supersymmetry,
as illustrated with the help of prototype non-supersymmetric models.
|
[
{
"created": "Mon, 30 Jan 2012 13:42:29 GMT",
"version": "v1"
}
] |
2015-06-04
|
[
[
"Giudice",
"Gian Francesco",
""
],
[
"Isidori",
"Gino",
""
],
[
"Paradisi",
"Paride",
""
]
] |
We analyze possible interpretations of the recent LHCb evidence for CP violation in D meson decays in terms of physics beyond the Standard Model. On general grounds, models in which the primary source of flavor violation is linked to the breaking of chiral symmetry (left-right flavor mixing) are natural candidates to explain this effect, via enhanced chromomagnetic operators. In the case of supersymmetric models, we identify two motivated scenarios: disoriented A-terms and split families. These structures predict other non-standard signals, such as nuclear EDMs close to their present bounds and, possibly, tiny but visible deviations in K and B physics, or even sizable flavor-violating processes involving the top quark or the stops. Some of these connections, especially the one with nuclear EDMs, hold beyond supersymmetry, as illustrated with the help of prototype non-supersymmetric models.
|
2301.12838
|
Ivan Kikunga
|
Musongela Lubo, Muanza Steve, Kikunga Kasenda Ivan, Mavungu Tsava
Christian
|
The Higgs Boson and The Fakeon Hypothesis
|
27 pages, No figures
| null | null | null |
hep-ph
|
http://creativecommons.org/licenses/by/4.0/
|
In this paper, we make an attempt to implement the fakeon hypothesis in
particle physics. To begin with, we consider a model in which the Higgs boson
is the only fakeon. We deduce its interactions with the electroweak gauge
bosons. Each such new interaction can be written as a product of two factors.
The first one depends, on the electroweak gauge bosons and their derivatives.
The second one solely depends, on the physical Higgs and its derivatives. We
also study the conserved quantities of different (free) fields in this setting.
|
[
{
"created": "Thu, 19 Jan 2023 22:41:06 GMT",
"version": "v1"
}
] |
2023-01-31
|
[
[
"Lubo",
"Musongela",
""
],
[
"Steve",
"Muanza",
""
],
[
"Ivan",
"Kikunga Kasenda",
""
],
[
"Christian",
"Mavungu Tsava",
""
]
] |
In this paper, we make an attempt to implement the fakeon hypothesis in particle physics. To begin with, we consider a model in which the Higgs boson is the only fakeon. We deduce its interactions with the electroweak gauge bosons. Each such new interaction can be written as a product of two factors. The first one depends, on the electroweak gauge bosons and their derivatives. The second one solely depends, on the physical Higgs and its derivatives. We also study the conserved quantities of different (free) fields in this setting.
|
hep-ph/9304252
|
Branko Guberina
|
Neven Bilic and Branko Guberina
|
Selected Topics on Rare Kaon Processes - in the Standard Model and
Supergravity -
|
52 pages (14 figures available upon request), LaTex, LMU-TP 7/89,
RBI-TP 4/89, final version July 1992, to be published in Fortschritte der
Physik
|
Fortschr.Phys.42:209-259,1994
|
10.1002/prop.2190420302
| null |
hep-ph
| null |
Rare kaon processes appear to be particularly suitable to study the
extensions of the standard model, especially if the possibility for eventual
direct evidence becomes unlikely. In this review, we discuss processes that are
important as a test of either the standard model or supergravity. Moreover,
some of these are important even for both the standard model and for
supergravity. Particular attention is paid to the reduction of uncertainties in
the calculation, especially the ones coming from the confinement effects.
Recent approaches, such as chiral perturbation theory, the large
$N_c$-expansion, QCD sum rules and lattice QCD, are discussed. This is found to
be the best strategy in view of the fact that supersymmetric effects are rather
tiny.
|
[
{
"created": "Wed, 14 Apr 1993 16:39:07 GMT",
"version": "v1"
}
] |
2010-11-01
|
[
[
"Bilic",
"Neven",
""
],
[
"Guberina",
"Branko",
""
]
] |
Rare kaon processes appear to be particularly suitable to study the extensions of the standard model, especially if the possibility for eventual direct evidence becomes unlikely. In this review, we discuss processes that are important as a test of either the standard model or supergravity. Moreover, some of these are important even for both the standard model and for supergravity. Particular attention is paid to the reduction of uncertainties in the calculation, especially the ones coming from the confinement effects. Recent approaches, such as chiral perturbation theory, the large $N_c$-expansion, QCD sum rules and lattice QCD, are discussed. This is found to be the best strategy in view of the fact that supersymmetric effects are rather tiny.
|
0906.5467
|
Ruben Garcia-Martin
|
R. Garcia-Martin, R. Kaminski, J. R. Pelaez, F. J. Yndurain
|
Once subtracted Roy-like dispersion relations and a precise analysis of
$\pi\pi$ scattering data
|
6 pages, 4 figures, to appear in the proceedings of the International
Workshop On Effective Field Theories: From The Pion To The Upsilon (EFT 09),
2-6 Feb 2009, Valencia, Spain
| null | null | null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We report our progress on the data analysis of $\pi\pi$ scattering data in
terms of Forward Dispersion Relations (FDR), as well as Roy equations (RE) and
their once-subtracted counterpart, GKPY equations. The first part of the
analysis consists of independent fits to the different $\pi\pi$ channels. The
GKPY equations provide a more stringent consistency check for the
parametrizations of the S0-wave data in the region from 400 to 1100 MeV, In the
second part we present our preliminary analysis where the fits are constrained
to satisfy all dispersion relations within errors, including the new GKPY Eqs.,
thus providing a very precise and model independent description of data using
just analyticity, causality and crossing.
|
[
{
"created": "Tue, 30 Jun 2009 10:49:39 GMT",
"version": "v1"
}
] |
2009-07-01
|
[
[
"Garcia-Martin",
"R.",
""
],
[
"Kaminski",
"R.",
""
],
[
"Pelaez",
"J. R.",
""
],
[
"Yndurain",
"F. J.",
""
]
] |
We report our progress on the data analysis of $\pi\pi$ scattering data in terms of Forward Dispersion Relations (FDR), as well as Roy equations (RE) and their once-subtracted counterpart, GKPY equations. The first part of the analysis consists of independent fits to the different $\pi\pi$ channels. The GKPY equations provide a more stringent consistency check for the parametrizations of the S0-wave data in the region from 400 to 1100 MeV, In the second part we present our preliminary analysis where the fits are constrained to satisfy all dispersion relations within errors, including the new GKPY Eqs., thus providing a very precise and model independent description of data using just analyticity, causality and crossing.
|
1807.07495
|
Manuel Epele
|
Manuel Epele, Carlos Garc\'ia Canal and Rodolfo Sassot
|
Heavy quark mass effects in parton-to-kaon hadronization probabilities
| null | null |
10.1016/j.physletb.2018.11.069
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We examine the relevance of the heavy quarks masses in the perturbative QCD
description of hard interactions where charged kaons are produced in the final
state. We extract a set of parton-to-kaon hadronization probabilities from a
next to leading order QCD global analysis where a general mass variable flavor
number scheme accounting for mass effects is implemented. We compare the
results with those obtained in the massless approximation and also with those
found in the case of final state pions. At variance with the very significant
improvement found for the much more precise pion fragmentation phenomenology,
the heavy quark mass dependent scheme improves mildly the overall description
of current kaon production data. Nevertheless, the changes in the charm
hadronization probability are noticeable.
|
[
{
"created": "Thu, 19 Jul 2018 15:33:19 GMT",
"version": "v1"
}
] |
2019-01-02
|
[
[
"Epele",
"Manuel",
""
],
[
"Canal",
"Carlos García",
""
],
[
"Sassot",
"Rodolfo",
""
]
] |
We examine the relevance of the heavy quarks masses in the perturbative QCD description of hard interactions where charged kaons are produced in the final state. We extract a set of parton-to-kaon hadronization probabilities from a next to leading order QCD global analysis where a general mass variable flavor number scheme accounting for mass effects is implemented. We compare the results with those obtained in the massless approximation and also with those found in the case of final state pions. At variance with the very significant improvement found for the much more precise pion fragmentation phenomenology, the heavy quark mass dependent scheme improves mildly the overall description of current kaon production data. Nevertheless, the changes in the charm hadronization probability are noticeable.
|
hep-ph/9901233
|
Thierry Gousset
|
M. Diehl, T. Gousset, B. Pire and O.V. Terayev
|
QCD factorization in gamma* gamma -> pi pi and gamma* N -> pi pi N
|
4 pages, 2 figures, talk given at INPC'98
| null |
10.1016/S0375-9474(00)88503-6
| null |
hep-ph
| null |
Exclusive two-pion production near threshold in the collision of a highly
virtual photon with a real one offers a new possibility to unravel the partonic
content of hadrons. We explain the dynamics of this regime, i.e. the separation
of the amplitude in terms of partonic diagrams computable in QCD perturbation
theory and generalized distribution amplitudes, which are nonperturbative
functions describing the exclusive transition of a parton pair into two
hadrons. The same quantities also appear in gamma* N -> pi pi N in the
kinematical regime where the momentum transfer of the nucleon and the invariant
mass of the pion pair are both small; this allows to extend the QCD analysis of
exclusive rho electroproduction outside the resonance region of the two
produced pions.
|
[
{
"created": "Wed, 6 Jan 1999 07:34:13 GMT",
"version": "v1"
}
] |
2009-10-31
|
[
[
"Diehl",
"M.",
""
],
[
"Gousset",
"T.",
""
],
[
"Pire",
"B.",
""
],
[
"Terayev",
"O. V.",
""
]
] |
Exclusive two-pion production near threshold in the collision of a highly virtual photon with a real one offers a new possibility to unravel the partonic content of hadrons. We explain the dynamics of this regime, i.e. the separation of the amplitude in terms of partonic diagrams computable in QCD perturbation theory and generalized distribution amplitudes, which are nonperturbative functions describing the exclusive transition of a parton pair into two hadrons. The same quantities also appear in gamma* N -> pi pi N in the kinematical regime where the momentum transfer of the nucleon and the invariant mass of the pion pair are both small; this allows to extend the QCD analysis of exclusive rho electroproduction outside the resonance region of the two produced pions.
|
1312.1749
|
Shunzo Kumano
|
H. Kawamura, S. Kumano, and T. Sekihara
|
Studies of exotic hadrons by high-energy exclusive reactions
|
4 pages, 7 figures, 12th Asia Pacific Physics Conference (APPC12),
JPS Conference Proceedings in press
| null | null |
KEK-TH-1647, J-PARC-TH-0027
|
hep-ph hep-ex nucl-ex nucl-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We investigate the possibility of clarifying internal structure of exotic
hadrons by high-energy exclusive reactions. In particular, the
constituent-counting rule could be used for determining the internal
configuration in large-angle exclusive scattering. As an example, we show the
cross section pi^- + p -> K^0 + Lambda(1405) in comparison with the one for the
ground-state Lambda production pi^- + p -> K^0 + Lambda. The counting rule
indicates that the cross section scales as s^8 dsigma /dt=constant if
Lambda(1405) is an ordinary three-quark baryon, whereas it is s^{10} dsigma
/dt=constant if Lambda(1405) is a five-quark baryon. Here, s and t are
Mandelstam variables. Such experiments could be possible at J-PARC, LEP, JLab,
CERN-COMPASS, and other high-energy facilities.
|
[
{
"created": "Fri, 6 Dec 2013 01:25:18 GMT",
"version": "v1"
}
] |
2013-12-09
|
[
[
"Kawamura",
"H.",
""
],
[
"Kumano",
"S.",
""
],
[
"Sekihara",
"T.",
""
]
] |
We investigate the possibility of clarifying internal structure of exotic hadrons by high-energy exclusive reactions. In particular, the constituent-counting rule could be used for determining the internal configuration in large-angle exclusive scattering. As an example, we show the cross section pi^- + p -> K^0 + Lambda(1405) in comparison with the one for the ground-state Lambda production pi^- + p -> K^0 + Lambda. The counting rule indicates that the cross section scales as s^8 dsigma /dt=constant if Lambda(1405) is an ordinary three-quark baryon, whereas it is s^{10} dsigma /dt=constant if Lambda(1405) is a five-quark baryon. Here, s and t are Mandelstam variables. Such experiments could be possible at J-PARC, LEP, JLab, CERN-COMPASS, and other high-energy facilities.
|
1610.04991
|
Tianhong Wang
|
Tianhong Wang, Zhi-Hui Wang, Yue Jiang, Libo Jiang and Guo-Li Wang
|
Strong decays of $D_{3}^{\ast}(2760)$, $D_{s3}^{\ast}(2860)$,
$B_{3}^{\ast}$, and $B_{s3}^{\ast}$
|
16 pages, 4 figures
| null | null | null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
In this paper, we study the OZI-allowed two-body strong decays of $3^-$
heavy-light mesons. Experimentally the charmed $D_{3}^{\ast}(2760)$ and the
charm-strange $D_{s3}^{\ast}(2860)$ states with these quantum numbers have been
discovered. For the bottomed $B(5970)$ state, which was found by the CDF
Collaboration recently, its quantum number has not been decided yet and we
assume its a $3^-$ meson in this paper. The theoretical prediction for the
strong decays of bottom-strange state $B_{s3}^\ast$ is also given. The
relativistic wave functions of $3^-$ heavy mesons are constructed and their
numerical values are obtained by solving the corresponding Bethe-Salpeter
equation with instantaneous approximation. The transition matrix is calculated
by using the PCAC and low energy theorem, following which, the decay widths are
obtained. For $D_{3}^\ast(2760)$ and $D_{s3}^\ast(2860)$, the total strong
decay widths are 72.6 MeV and 47.6 MeV, respectively. For $B_3^\ast$ with
$M=5978$ MeV and $B_{s3}^\ast$ with $M=6178$ MeV, their strong decay widths are
22.9 MeV and 40.8 MeV, respectively.
|
[
{
"created": "Mon, 17 Oct 2016 07:36:36 GMT",
"version": "v1"
}
] |
2016-10-18
|
[
[
"Wang",
"Tianhong",
""
],
[
"Wang",
"Zhi-Hui",
""
],
[
"Jiang",
"Yue",
""
],
[
"Jiang",
"Libo",
""
],
[
"Wang",
"Guo-Li",
""
]
] |
In this paper, we study the OZI-allowed two-body strong decays of $3^-$ heavy-light mesons. Experimentally the charmed $D_{3}^{\ast}(2760)$ and the charm-strange $D_{s3}^{\ast}(2860)$ states with these quantum numbers have been discovered. For the bottomed $B(5970)$ state, which was found by the CDF Collaboration recently, its quantum number has not been decided yet and we assume its a $3^-$ meson in this paper. The theoretical prediction for the strong decays of bottom-strange state $B_{s3}^\ast$ is also given. The relativistic wave functions of $3^-$ heavy mesons are constructed and their numerical values are obtained by solving the corresponding Bethe-Salpeter equation with instantaneous approximation. The transition matrix is calculated by using the PCAC and low energy theorem, following which, the decay widths are obtained. For $D_{3}^\ast(2760)$ and $D_{s3}^\ast(2860)$, the total strong decay widths are 72.6 MeV and 47.6 MeV, respectively. For $B_3^\ast$ with $M=5978$ MeV and $B_{s3}^\ast$ with $M=6178$ MeV, their strong decay widths are 22.9 MeV and 40.8 MeV, respectively.
|
hep-ph/0505265
|
Stefan Scherer
|
Stefan Scherer and Matthias R. Schindler
|
A Chiral Perturbation Theory Primer
|
150 pages, 16 figures, 50 exercises, lectures given at the ECT*
Doctoral Training Programme 2005 (Marie Curie Training Site) "Hadronic
Physics"
| null | null |
MKPH-T-05-08
|
hep-ph nucl-th
| null |
These lecture notes include the following topics. Chapter 1 deals with QCD
and its global symmetries in the chiral limit, explicit symmetry breaking in
terms of the quark masses, and the concept of Green functions and Ward
identities reflecting the underlying chiral symmetry. In Chapter 2 the idea of
a spontaneous breakdown of a global symmetry is discussed and its consequences
in terms of the Goldstone theorem are demonstrated. Chapter 3 deals with
mesonic chiral perturbation theory and the principles entering the construction
of the chiral Lagrangian are outlined. In Chapter 4 the methods are extended to
include the interaction between Goldstone bosons and baryons in the
single-baryon sector.
|
[
{
"created": "Tue, 31 May 2005 09:13:05 GMT",
"version": "v1"
}
] |
2007-05-23
|
[
[
"Scherer",
"Stefan",
""
],
[
"Schindler",
"Matthias R.",
""
]
] |
These lecture notes include the following topics. Chapter 1 deals with QCD and its global symmetries in the chiral limit, explicit symmetry breaking in terms of the quark masses, and the concept of Green functions and Ward identities reflecting the underlying chiral symmetry. In Chapter 2 the idea of a spontaneous breakdown of a global symmetry is discussed and its consequences in terms of the Goldstone theorem are demonstrated. Chapter 3 deals with mesonic chiral perturbation theory and the principles entering the construction of the chiral Lagrangian are outlined. In Chapter 4 the methods are extended to include the interaction between Goldstone bosons and baryons in the single-baryon sector.
|
1706.04091
|
A. V. Luchinsky
|
A. V. Luchinsky
|
Leading order NRQCD and Light-Cone Analysis of Exclusive Charmonia
Production in Radiative $Z$-boson Decays
|
Minor changes, some references added
| null | null | null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
The presented paper is devoted to theoretical analysis of charmonium mesons
$\eta_c$, $J/\psi$, $\chi_{c0,1,2}$, and $h_c$ production in exclusive
radiative $Z$ boson decays in the frameworks of Nonrelativistic Chromodynamic
and amplitude expansion on the light-cone. In the framework of light-cone
expansion amplitudes and widths of all processes are described with one
universal relation. It is interesting to note that from this relation it
follows automatically which component of $Z$ boson (either vector or axial)
gives contribution to the width of the particular decay. It is shown that the
effect of internal quark motion almost doubles theoretical predictions for
production of $S$-wave charmonia and $\chi_{c1}$ meson.
|
[
{
"created": "Tue, 13 Jun 2017 14:26:35 GMT",
"version": "v1"
},
{
"created": "Fri, 16 Jun 2017 13:33:38 GMT",
"version": "v2"
},
{
"created": "Thu, 7 Sep 2017 21:24:25 GMT",
"version": "v3"
}
] |
2017-09-11
|
[
[
"Luchinsky",
"A. V.",
""
]
] |
The presented paper is devoted to theoretical analysis of charmonium mesons $\eta_c$, $J/\psi$, $\chi_{c0,1,2}$, and $h_c$ production in exclusive radiative $Z$ boson decays in the frameworks of Nonrelativistic Chromodynamic and amplitude expansion on the light-cone. In the framework of light-cone expansion amplitudes and widths of all processes are described with one universal relation. It is interesting to note that from this relation it follows automatically which component of $Z$ boson (either vector or axial) gives contribution to the width of the particular decay. It is shown that the effect of internal quark motion almost doubles theoretical predictions for production of $S$-wave charmonia and $\chi_{c1}$ meson.
|
hep-ph/0702253
|
Shunji Yoshimoto
|
Masayasu Harada, Yukio Nemoto, Shunji Yoshimoto
|
Quark spectrum above the critical temperature from Schwinger-Dyson
equation
|
6 pages, 4 figures, contribution to the proceedings of the 19th
International Conference on Ultra-Relativistic Nucleus-Nucleus Collisions
(QM2006), November 14-20 2006, Shanghai, China
|
Int.J.Mod.Phys.E16:2282-2288,2007
|
10.1142/S0218301307007817
| null |
hep-ph
| null |
We investigate a spectrum of a fermion, which we call a quark, above the
critical temperature of the chiral phase transition in a gauge theory using the
Schwinger-Dyson (SD) equation. The SD equation enables us to study the spectrum
over a wide range of the gauge coupling. It is shown that the quark spectrum
has two sharp peaks which correspond to the normal quasi-quark and the plasmino
and is consistent with that obtained in the hard thermal loop approximation in
the weak coupling region, while it has also two peaks but with smaller thermal
masses and broader widths in the strong coupling region. Temperature-dependence
of the quark spectrum is also discussed.
|
[
{
"created": "Mon, 26 Feb 2007 01:30:59 GMT",
"version": "v1"
}
] |
2010-11-26
|
[
[
"Harada",
"Masayasu",
""
],
[
"Nemoto",
"Yukio",
""
],
[
"Yoshimoto",
"Shunji",
""
]
] |
We investigate a spectrum of a fermion, which we call a quark, above the critical temperature of the chiral phase transition in a gauge theory using the Schwinger-Dyson (SD) equation. The SD equation enables us to study the spectrum over a wide range of the gauge coupling. It is shown that the quark spectrum has two sharp peaks which correspond to the normal quasi-quark and the plasmino and is consistent with that obtained in the hard thermal loop approximation in the weak coupling region, while it has also two peaks but with smaller thermal masses and broader widths in the strong coupling region. Temperature-dependence of the quark spectrum is also discussed.
|
hep-ph/0102309
|
Daniel Kabat
|
Daniel Kabat (Columbia University), Arvind Rajaraman (Rutgers
University)
|
Testing cosmological supersymmetry breaking
|
9 pages, LaTeX. v2: references added, comments added to conclusions
|
Phys.Lett.B516:383-387,2001
|
10.1016/S0370-2693(01)00935-2
|
CU-TP-1006, RUNHETC-2001-06
|
hep-ph hep-th
| null |
Banks has proposed a relation between the scale of supersymmetry breaking and
the cosmological constant in de Sitter space. His proposal has a natural
extension to a general FRW cosmology, in which the supersymmetry breaking scale
is related to the Hubble parameter. We study one consequence of such a
relation, namely that coupling constants change as the universe evolves. We
find that the most straightforward extension of Banks' proposal is disfavored
by experimental bounds on variation of the fine structure constant.
|
[
{
"created": "Sun, 25 Feb 2001 23:41:07 GMT",
"version": "v1"
},
{
"created": "Wed, 11 Apr 2001 20:18:31 GMT",
"version": "v2"
}
] |
2008-11-26
|
[
[
"Kabat",
"Daniel",
"",
"Columbia University"
],
[
"Rajaraman",
"Arvind",
"",
"Rutgers\n University"
]
] |
Banks has proposed a relation between the scale of supersymmetry breaking and the cosmological constant in de Sitter space. His proposal has a natural extension to a general FRW cosmology, in which the supersymmetry breaking scale is related to the Hubble parameter. We study one consequence of such a relation, namely that coupling constants change as the universe evolves. We find that the most straightforward extension of Banks' proposal is disfavored by experimental bounds on variation of the fine structure constant.
|
hep-ph/9310371
| null |
Dae Gyu Lee and R.N.Mohapatra (University of Maryland, College Park)
|
Natural Doublet-Triplet Splitting in Supersymmetric SO(10) Model
|
UMD-PP-94-50, Latex,9 pages
|
Phys.Lett. B324 (1994) 376-379
|
10.1016/0370-2693(94)90209-7
| null |
hep-ph
| null |
We construct a supersymmetric SO(10) model, where natural doublet-triplet
splitting implemented via the Dimopoulos-Wilczek mechanism is stable under the
addition of 126+\bar{126} Higgs superfields needed to generate the small
neutrino masses via the see-saw mechanism and where both the charged fermion
and neutrino masses arise from just one set of 10 and \bar{126} multiplets.
|
[
{
"created": "Fri, 29 Oct 1993 13:22:22 GMT",
"version": "v1"
}
] |
2009-10-22
|
[
[
"Lee",
"Dae Gyu",
"",
"University of Maryland, College Park"
],
[
"Mohapatra",
"R. N.",
"",
"University of Maryland, College Park"
]
] |
We construct a supersymmetric SO(10) model, where natural doublet-triplet splitting implemented via the Dimopoulos-Wilczek mechanism is stable under the addition of 126+\bar{126} Higgs superfields needed to generate the small neutrino masses via the see-saw mechanism and where both the charged fermion and neutrino masses arise from just one set of 10 and \bar{126} multiplets.
|
0805.2606
|
Finn Ravndal
|
Finn Ravndal
|
Electromagnetic energy-momentum tensors in media
|
12 pages, LaTeX; minor text improvements
| null | null | null |
hep-ph physics.hist-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
It is pointed out that the previous energy-momentum tensors of Minkowski and
Abraham for the electromagnetic field in continuous media are based on a
covariant formulation which does not reflect a symmetry inherent to the system.
Instead, taking into account the intrinsic invariance under Lorentz
transformations involving the reduced speed of light in such a medium, a
compact and fully consistent theory can be formulated without the old problems.
|
[
{
"created": "Fri, 16 May 2008 19:24:09 GMT",
"version": "v1"
},
{
"created": "Tue, 30 Sep 2008 13:57:44 GMT",
"version": "v2"
}
] |
2008-09-30
|
[
[
"Ravndal",
"Finn",
""
]
] |
It is pointed out that the previous energy-momentum tensors of Minkowski and Abraham for the electromagnetic field in continuous media are based on a covariant formulation which does not reflect a symmetry inherent to the system. Instead, taking into account the intrinsic invariance under Lorentz transformations involving the reduced speed of light in such a medium, a compact and fully consistent theory can be formulated without the old problems.
|
1705.01945
|
Oliver Schulz
|
Allen Caldwell, Manuel Ettengruber, Alexander Merle, Oliver Schulz,
Maximilian Totzauer
|
A Global Bayesian Analysis of Neutrino Mass Data
|
17 pages, 10 figures
|
Phys. Rev. D 96, 073001 (2017)
|
10.1103/PhysRevD.96.073001
|
MPP-2017-79
|
hep-ph astro-ph.CO hep-ex
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We perform a global Bayesian analysis of currently available neutrino data,
putting data from oscillation experiments, neutrinoless double beta decay
($0\nu\beta\beta$), and precision cosmology on an equal footing. We evaluate
the discovery potential of future $0\nu\beta\beta$ experiments and the Bayes
factor of the two possible neutrino mass ordering schemes for different prior
choices. We show that the indication for normal ordering is still very mild and
does not strongly depend on realistic prior assumptions or different
combinations of cosmological data sets. We find a wide range for
$0\nu\beta\beta$ discovery potential, depending on the absolute neutrino mass
scale, mass ordering and achievable background level.
|
[
{
"created": "Thu, 4 May 2017 18:00:02 GMT",
"version": "v1"
},
{
"created": "Wed, 4 Aug 2021 14:37:48 GMT",
"version": "v2"
}
] |
2021-08-05
|
[
[
"Caldwell",
"Allen",
""
],
[
"Ettengruber",
"Manuel",
""
],
[
"Merle",
"Alexander",
""
],
[
"Schulz",
"Oliver",
""
],
[
"Totzauer",
"Maximilian",
""
]
] |
We perform a global Bayesian analysis of currently available neutrino data, putting data from oscillation experiments, neutrinoless double beta decay ($0\nu\beta\beta$), and precision cosmology on an equal footing. We evaluate the discovery potential of future $0\nu\beta\beta$ experiments and the Bayes factor of the two possible neutrino mass ordering schemes for different prior choices. We show that the indication for normal ordering is still very mild and does not strongly depend on realistic prior assumptions or different combinations of cosmological data sets. We find a wide range for $0\nu\beta\beta$ discovery potential, depending on the absolute neutrino mass scale, mass ordering and achievable background level.
|
2212.14553
|
Da Huang
|
Jiajun Wu, Da Huang, Chao-Qiang Geng
|
$W$-Boson Mass Anomaly from a General $SU(2)_{L}$ Scalar Multiplet
|
36 pages, 13 figures. Minor modifications, references updated;
| null |
10.1088/1674-1137/acc8bf
| null |
hep-ph
|
http://creativecommons.org/licenses/by/4.0/
|
We explain the $W$-boson mass anomaly by introducing an $SU(2)_L$ scalar
multiplet with general isospin and hypercharge in the case without its vacuum
expectation value. It is shown that the dominant contribution from the scalar
multiplet to the $W$-boson mass arises at one-loop level, which can be
expressed in terms of the electroweak (EW) oblique parameters $T$ and $S$ at
leading order. We firstly rederive the general formulae of $T$ and $S$ induced
by a scalar multiplet of EW charges, confirming the results in the literature.
We then study several specific examples of great phenomenological interest by
applying these general expressions. As a result, it is found that the model
with a scalar multiplet in an $SU(2)_L$ real representation with $Y=0$ cannot
generate the required $M_W$ correction since it leads to vanishing values of
$T$ and $S$. On the other hand, the cases with scalars in a complex
representation under $SU(2)_L$ with a general hypercharge can explain the $M_W$
excess observed by CDF-\uppercase\expandafter{\romannumeral2} due to nonzero
$T$ and $S$. We further take into account of the strong constraints from the
perturbativity and the EW global fit of the precision data, and vary the
isospin representation and hypercharge of the additional scalar multiplet, in
order to assess the extent of the model to solve the $W$-boson mass anomaly. It
turns out that these constraints play important roles in setting limits on the
model parameter space. We also briefly describe the collider signatures of the
extra scalar multiplet, especially when it contains long-lived heavy highly
charged states.
|
[
{
"created": "Fri, 30 Dec 2022 05:10:04 GMT",
"version": "v1"
},
{
"created": "Sat, 4 Feb 2023 05:53:17 GMT",
"version": "v2"
}
] |
2023-05-31
|
[
[
"Wu",
"Jiajun",
""
],
[
"Huang",
"Da",
""
],
[
"Geng",
"Chao-Qiang",
""
]
] |
We explain the $W$-boson mass anomaly by introducing an $SU(2)_L$ scalar multiplet with general isospin and hypercharge in the case without its vacuum expectation value. It is shown that the dominant contribution from the scalar multiplet to the $W$-boson mass arises at one-loop level, which can be expressed in terms of the electroweak (EW) oblique parameters $T$ and $S$ at leading order. We firstly rederive the general formulae of $T$ and $S$ induced by a scalar multiplet of EW charges, confirming the results in the literature. We then study several specific examples of great phenomenological interest by applying these general expressions. As a result, it is found that the model with a scalar multiplet in an $SU(2)_L$ real representation with $Y=0$ cannot generate the required $M_W$ correction since it leads to vanishing values of $T$ and $S$. On the other hand, the cases with scalars in a complex representation under $SU(2)_L$ with a general hypercharge can explain the $M_W$ excess observed by CDF-\uppercase\expandafter{\romannumeral2} due to nonzero $T$ and $S$. We further take into account of the strong constraints from the perturbativity and the EW global fit of the precision data, and vary the isospin representation and hypercharge of the additional scalar multiplet, in order to assess the extent of the model to solve the $W$-boson mass anomaly. It turns out that these constraints play important roles in setting limits on the model parameter space. We also briefly describe the collider signatures of the extra scalar multiplet, especially when it contains long-lived heavy highly charged states.
|
1305.0786
|
Chuwen Xiao
|
C. W. Xiao and E. Oset
|
Hidden beauty baryon states in the local hidden gauge approach with
heavy quark spin symmetry
|
misprint corrected
| null |
10.1140/epja/i2013-13139-y
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Using a coupled channel unitary approach, combining the heavy quark spin
symmetry and the dynamics of the local hidden gauge, we investigate the
meson-baryon interaction with hidden beauty and obtain several new states of
$N^*$ around 11 GeV. We consider the basis of states $\eta_b N$, $\Upsilon N$,
$B \Lambda_b$, $B \Sigma_b$, $B^* \Lambda_b$, $B^* \Sigma_b$, $B^* \Sigma_b^*$
and find four basic bound states which correspond to $B \Sigma_b$, $B
\Sigma_b^*$, $B^* \Sigma_b$ and $B^* \Sigma_b^*$, decaying mostly into $\eta_b
N$ and $\Upsilon N$ and with a binding energy about 50-130 MeV with respect to
the thresholds of the corresponding channel. All of them have isospin $I=1/2$,
and there are no bound states or resonances in $I=3/2$. The $B \Sigma_b$ state
appears in $J=1/2$, the $B \Sigma_b^*$ in $J=3/2$, the $B^* \Sigma_b$ appears
nearly degenerate in $J=1/2, ~3/2$ and the $B^* \Sigma_b^*$ appears nearly
degenerate in $J=1/2, ~3/2, ~5/2$. These states have a width from $6 \sim 45
\mev$ except for the one in $J=5/2$ which has zero width since it cannot decay
into any of the states of the basis chosen.
|
[
{
"created": "Fri, 3 May 2013 17:29:10 GMT",
"version": "v1"
},
{
"created": "Tue, 7 May 2013 16:12:14 GMT",
"version": "v2"
}
] |
2015-06-15
|
[
[
"Xiao",
"C. W.",
""
],
[
"Oset",
"E.",
""
]
] |
Using a coupled channel unitary approach, combining the heavy quark spin symmetry and the dynamics of the local hidden gauge, we investigate the meson-baryon interaction with hidden beauty and obtain several new states of $N^*$ around 11 GeV. We consider the basis of states $\eta_b N$, $\Upsilon N$, $B \Lambda_b$, $B \Sigma_b$, $B^* \Lambda_b$, $B^* \Sigma_b$, $B^* \Sigma_b^*$ and find four basic bound states which correspond to $B \Sigma_b$, $B \Sigma_b^*$, $B^* \Sigma_b$ and $B^* \Sigma_b^*$, decaying mostly into $\eta_b N$ and $\Upsilon N$ and with a binding energy about 50-130 MeV with respect to the thresholds of the corresponding channel. All of them have isospin $I=1/2$, and there are no bound states or resonances in $I=3/2$. The $B \Sigma_b$ state appears in $J=1/2$, the $B \Sigma_b^*$ in $J=3/2$, the $B^* \Sigma_b$ appears nearly degenerate in $J=1/2, ~3/2$ and the $B^* \Sigma_b^*$ appears nearly degenerate in $J=1/2, ~3/2, ~5/2$. These states have a width from $6 \sim 45 \mev$ except for the one in $J=5/2$ which has zero width since it cannot decay into any of the states of the basis chosen.
|
1901.08074
|
Kristjan Kannike
|
Andi Hektor, Andrzej Hryczuk, Kristjan Kannike
|
Improved bounds on $\mathbb{Z}_{3}$ singlet dark matter
|
22 pages, 4 figures
|
JHEP 1903 (2019) 204
|
10.1007/JHEP03(2019)204
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We reconsider complex scalar singlet dark matter stabilised by a
$\mathbb{Z}_{3}$ symmetry. We refine the stability bounds on the potential and
use constraints from unitarity on scattering at finite energy to place a
stronger lower limit on the direct detection cross section. In addition, we
improve the treatment of the thermal freeze-out by including the evolution of
the dark matter temperature and its feedback onto relic abundance. In the
regions where the freeze-out is dominated by resonant or semi-annihilation, the
dark matter decouples kinetically from the plasma very early, around the onset
of the chemical decoupling. This results in a modification of the required
coupling to the Higgs, which turns out to be at most few per cent in the
semi-annihilation region, thus giving credence to the standard approach to the
relic density calculation in this regime. In contrast, for dark matter mass
just below the Higgs resonance, the modification of the Higgs invisible width
and direct and indirect detection signals can be up to a factor $6.7$. The
model is then currently allowed at $56.8$ GeV to $58.4$ GeV (depending on the
details of early kinetic decoupling) $\lesssim M_{S} \lesssim 62.8$ GeV and at
$M_{S} \gtrsim 122$ GeV if the freeze-out is dominated by semi-annihilation. We
show that the whole large semi-annihilation region will be probed by the
near-future measurements at the XENONnT experiment.
|
[
{
"created": "Wed, 23 Jan 2019 19:00:06 GMT",
"version": "v1"
},
{
"created": "Tue, 9 Apr 2019 12:43:02 GMT",
"version": "v2"
}
] |
2019-04-10
|
[
[
"Hektor",
"Andi",
""
],
[
"Hryczuk",
"Andrzej",
""
],
[
"Kannike",
"Kristjan",
""
]
] |
We reconsider complex scalar singlet dark matter stabilised by a $\mathbb{Z}_{3}$ symmetry. We refine the stability bounds on the potential and use constraints from unitarity on scattering at finite energy to place a stronger lower limit on the direct detection cross section. In addition, we improve the treatment of the thermal freeze-out by including the evolution of the dark matter temperature and its feedback onto relic abundance. In the regions where the freeze-out is dominated by resonant or semi-annihilation, the dark matter decouples kinetically from the plasma very early, around the onset of the chemical decoupling. This results in a modification of the required coupling to the Higgs, which turns out to be at most few per cent in the semi-annihilation region, thus giving credence to the standard approach to the relic density calculation in this regime. In contrast, for dark matter mass just below the Higgs resonance, the modification of the Higgs invisible width and direct and indirect detection signals can be up to a factor $6.7$. The model is then currently allowed at $56.8$ GeV to $58.4$ GeV (depending on the details of early kinetic decoupling) $\lesssim M_{S} \lesssim 62.8$ GeV and at $M_{S} \gtrsim 122$ GeV if the freeze-out is dominated by semi-annihilation. We show that the whole large semi-annihilation region will be probed by the near-future measurements at the XENONnT experiment.
|
1802.06755
|
Martin Hentschinski
|
Martin Hentschinski
|
The Color Glass Condensate formalism, Balitsky-JIMWLK evolution and
Lipatov's high energy effective action
|
26 pages, 39 figures; typos corrected and references updated; agrees
with version published in Physical Review D
|
Phys. Rev. D 97, 114027 (2018)
|
10.1103/PhysRevD.97.114027
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We investigate the question whether Lipatov's high energy effective action is
capable to reproduce quark and gluon propagators which resum interaction with a
strong background field within high energy factorization. Such propagators are
frequently employed in calculations within the Color Glass Condensate
formalism, in particular when considering scattering of a dilute projectile on
a dense target nucleus or nucleon. We find that such propagators can be
obtained from the high energy effective action, if a special parametrization of
the gluonic field is used, first proposed by Lipatov in the original
publication on the high energy effective action. The obtained propagators are
used to rederive from the high energy effective action the leading order
Balitsky-JIMWLK evolution equation in covariant gauge. As an aside, our result
confirms the definition of the reggeized gluon as the logarithm of an adjoint
Wilson lines, proposed in the literature.
|
[
{
"created": "Mon, 19 Feb 2018 18:41:56 GMT",
"version": "v1"
},
{
"created": "Thu, 30 Aug 2018 18:16:37 GMT",
"version": "v2"
}
] |
2018-09-03
|
[
[
"Hentschinski",
"Martin",
""
]
] |
We investigate the question whether Lipatov's high energy effective action is capable to reproduce quark and gluon propagators which resum interaction with a strong background field within high energy factorization. Such propagators are frequently employed in calculations within the Color Glass Condensate formalism, in particular when considering scattering of a dilute projectile on a dense target nucleus or nucleon. We find that such propagators can be obtained from the high energy effective action, if a special parametrization of the gluonic field is used, first proposed by Lipatov in the original publication on the high energy effective action. The obtained propagators are used to rederive from the high energy effective action the leading order Balitsky-JIMWLK evolution equation in covariant gauge. As an aside, our result confirms the definition of the reggeized gluon as the logarithm of an adjoint Wilson lines, proposed in the literature.
|
1408.0292
|
Anders Johan Andreassen
|
Anders Andreassen, William Frost and Matthew D. Schwartz
|
Consistent Use of the Standard Model Effective Potential
|
5 pages, 5 figures
|
Phys. Rev. Lett. 113, 241801 (2014)
|
10.1103/PhysRevLett.113.241801
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
The stability of the Standard Model is determined by the true minimum of the
effective Higgs potential. We show that the potential at its minimum when
computed by the traditional method is strongly dependent on the gauge
parameter. It moreover depends on the scale where the potential is calculated.
We provide a consistent method for determining absolute stability independent
of both gauge and calculation scale, order by order in perturbation theory.
This leads to a revised stability bounds mH > (129.4 \pm 2.3) GeV and mt <
(171.2 \pm 0.3)GeV. We also show how to evaluate the effect of new physics on
the stability bound without resorting to unphysical field values.
|
[
{
"created": "Fri, 1 Aug 2014 20:01:27 GMT",
"version": "v1"
},
{
"created": "Mon, 25 Aug 2014 19:39:10 GMT",
"version": "v2"
}
] |
2014-12-17
|
[
[
"Andreassen",
"Anders",
""
],
[
"Frost",
"William",
""
],
[
"Schwartz",
"Matthew D.",
""
]
] |
The stability of the Standard Model is determined by the true minimum of the effective Higgs potential. We show that the potential at its minimum when computed by the traditional method is strongly dependent on the gauge parameter. It moreover depends on the scale where the potential is calculated. We provide a consistent method for determining absolute stability independent of both gauge and calculation scale, order by order in perturbation theory. This leads to a revised stability bounds mH > (129.4 \pm 2.3) GeV and mt < (171.2 \pm 0.3)GeV. We also show how to evaluate the effect of new physics on the stability bound without resorting to unphysical field values.
|
1512.03433
|
Tom Melia
|
Brian Henning, Xiaochuan Lu, Tom Melia, and Hitoshi Murayama
|
2, 84, 30, 993, 560, 15456, 11962, 261485, ...: Higher dimension
operators in the SM EFT
|
15 pages + appendix, one figure, three tables, two auxiliary files;
v2 journal version, typo corrected (see footnote 5)
| null | null | null |
hep-ph hep-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
In a companion paper, we show that operator bases for general effective field
theories are controlled by the conformal algebra. Equations of motion and
integration by parts identities can be systematically treated by organizing
operators into irreducible representations of the conformal group. In the
present work, we use this result to study the standard model effective field
theory (SM EFT), determining the content and number of higher dimension
operators up to dimension 12, for an arbitrary number of fermion generations.
We find additional operators to those that have appeared in the literature at
dimension 7 (specifically in the case of more than one fermion generation) and
at dimension 8.
(The title sequence is the total number of independent operators in the SM
EFT with one fermion generation, including hermitian conjugates, ordered in
mass dimension, starting at dimension 5.)
|
[
{
"created": "Thu, 10 Dec 2015 21:00:09 GMT",
"version": "v1"
},
{
"created": "Fri, 23 Aug 2019 01:56:45 GMT",
"version": "v2"
}
] |
2019-08-26
|
[
[
"Henning",
"Brian",
""
],
[
"Lu",
"Xiaochuan",
""
],
[
"Melia",
"Tom",
""
],
[
"Murayama",
"Hitoshi",
""
]
] |
In a companion paper, we show that operator bases for general effective field theories are controlled by the conformal algebra. Equations of motion and integration by parts identities can be systematically treated by organizing operators into irreducible representations of the conformal group. In the present work, we use this result to study the standard model effective field theory (SM EFT), determining the content and number of higher dimension operators up to dimension 12, for an arbitrary number of fermion generations. We find additional operators to those that have appeared in the literature at dimension 7 (specifically in the case of more than one fermion generation) and at dimension 8. (The title sequence is the total number of independent operators in the SM EFT with one fermion generation, including hermitian conjugates, ordered in mass dimension, starting at dimension 5.)
|
2012.00613
|
Calum Milloy
|
Giulio Falcioni, Einan Gardi, Calum Milloy, Leonardo Vernazza
|
Climbing three-Reggeon ladders: four-loop amplitudes in the high-energy
limit in full colour
|
6 pages, 3 figures
|
Phys. Rev. D 103, 111501 (2021)
|
10.1103/PhysRevD.103.L111501
| null |
hep-ph hep-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Using an iterative solution of rapidity evolution equations, we compute
partonic $2\to 2$ gauge theory amplitudes at four loops in full colour up to
the Next-to-Next-to-Leading Logarithms (NNLL) in the Regge limit. By
contrasting the resulting amplitude with the exponentiation properties of soft
singularities we determine the four-loop correction to the soft anomalous
dimension at this logarithmic accuracy, which universally holds in any gauge
theory. We find that the latter features quartic Casimir contributions beyond
those appearing in the cusp anomalous dimension. Finally, in the case of ${\cal
N}=4$ super Yang-Mills, we also determine the finite hard function at four
loops through NNLL in full colour.
|
[
{
"created": "Tue, 1 Dec 2020 16:32:10 GMT",
"version": "v1"
}
] |
2021-09-08
|
[
[
"Falcioni",
"Giulio",
""
],
[
"Gardi",
"Einan",
""
],
[
"Milloy",
"Calum",
""
],
[
"Vernazza",
"Leonardo",
""
]
] |
Using an iterative solution of rapidity evolution equations, we compute partonic $2\to 2$ gauge theory amplitudes at four loops in full colour up to the Next-to-Next-to-Leading Logarithms (NNLL) in the Regge limit. By contrasting the resulting amplitude with the exponentiation properties of soft singularities we determine the four-loop correction to the soft anomalous dimension at this logarithmic accuracy, which universally holds in any gauge theory. We find that the latter features quartic Casimir contributions beyond those appearing in the cusp anomalous dimension. Finally, in the case of ${\cal N}=4$ super Yang-Mills, we also determine the finite hard function at four loops through NNLL in full colour.
|
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