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|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
1907.11326
|
Adarsh Pyarelal
|
Adarsh Pyarelal and Shufang Su
|
Higgs Assisted Razor Search for Higgsinos at a 100 TeV pp Collider
| null | null | null | null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
A 100 TeV proton-proton collider will be an extremely effective way to probe
the electroweak sector of the Minimal Supersymmetric Standard Model (MSSM). In
this paper, we describe a search strategy for discovering pair-produced
Higgsino-like next-to-lightest supersymmetric particles (NLSPs) at a 100 TeV
hadron collider that decay to Bino-like lightest supersymmetric particle (LSP)
via intermediate Z and SM Higgs boson that in turn decay to a pair of leptons
and a pair of b-quarks respectively: $\widetilde{N}_2^0\widetilde{N}_3^0
\rightarrow (Z\widetilde{N}_1^0)(h\widetilde{N}_1^0)\rightarrow
bb\ell\ell+\widetilde{N}_1^0\widetilde{N}_1^0$. In addition, we examine the
potential for machine learning techniques to boost the power of our searches.
Using this analysis, Higgsinos up to 1.4 TeV can be discovered at $5\sigma$
level for a Bino with mass of about 0.9 TeV using 3000 fb$^{-1}$ of data.
Additionally, Higgsinos up to 1.8 TeV can be excluded at 95% C.L. for Binos
with mass of about 1.4 TeV. This search channel extends the multi-lepton search
limits, especially in the region where the mass difference between the Higgsino
NLSPs and the Bino LSP is small.
|
[
{
"created": "Thu, 25 Jul 2019 22:31:57 GMT",
"version": "v1"
}
] |
2019-07-29
|
[
[
"Pyarelal",
"Adarsh",
""
],
[
"Su",
"Shufang",
""
]
] |
A 100 TeV proton-proton collider will be an extremely effective way to probe the electroweak sector of the Minimal Supersymmetric Standard Model (MSSM). In this paper, we describe a search strategy for discovering pair-produced Higgsino-like next-to-lightest supersymmetric particles (NLSPs) at a 100 TeV hadron collider that decay to Bino-like lightest supersymmetric particle (LSP) via intermediate Z and SM Higgs boson that in turn decay to a pair of leptons and a pair of b-quarks respectively: $\widetilde{N}_2^0\widetilde{N}_3^0 \rightarrow (Z\widetilde{N}_1^0)(h\widetilde{N}_1^0)\rightarrow bb\ell\ell+\widetilde{N}_1^0\widetilde{N}_1^0$. In addition, we examine the potential for machine learning techniques to boost the power of our searches. Using this analysis, Higgsinos up to 1.4 TeV can be discovered at $5\sigma$ level for a Bino with mass of about 0.9 TeV using 3000 fb$^{-1}$ of data. Additionally, Higgsinos up to 1.8 TeV can be excluded at 95% C.L. for Binos with mass of about 1.4 TeV. This search channel extends the multi-lepton search limits, especially in the region where the mass difference between the Higgsino NLSPs and the Bino LSP is small.
|
0908.1135
|
Siegfried Bethke
|
Siegfried Bethke (Max-Planck-Institute of Physics; Munich, Germany)
|
The 2009 World Average of $\alpha_s$
|
14 pages, 7 figures
|
Eur.Phys.J.C64:689-703,2009
|
10.1140/epjc/s10052-009-1173-1
|
MPP-2009-149
|
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Measurements of $\alpha_s$, the coupling strength of the Strong Interaction
between quarks and gluons, are summarised and an updated value of the world
average of $\alpha_s (M_Z)$ is derived. Building up on previous reviews,
special emphasis is laid on the most recent determinations of $\alpha_s$. These
are obtained from $\tau$-decays, from global fits of electroweak precision data
and from measurements of the proton structure function $\F_2$, which are based
on perturbative QCD calculations up to $O(\alpha_s^4)$; from hadronic event
shapes and jet production in $\epem$ annihilation, based on $O(\alpha_s^3) $
QCD; from jet production in deep inelastic scattering and from $\Upsilon$
decays, based on $O(\alpha_s^2) $ QCD; and from heavy quarkonia based on
unquenched QCD lattice calculations. Applying pragmatic methods to deal with
possibly underestimated errors and/or unknown correlations, the world average
value of $\alpha_s (M_Z)$ results in $\alpha_s (M_Z) = 0.1184 \pm 0.0007$. The
measured values of $\alpha_s (Q)$, covering energy scales from $Q \equiv \mtau
= 1.78$ GeV to 209 GeV, exactly follow the energy dependence predicted by QCD
and therefore significantly test the concept af Asymptotic Freedom.
|
[
{
"created": "Mon, 10 Aug 2009 12:40:24 GMT",
"version": "v1"
},
{
"created": "Sat, 15 Aug 2009 14:19:14 GMT",
"version": "v2"
}
] |
2009-12-04
|
[
[
"Bethke",
"Siegfried",
"",
"Max-Planck-Institute of Physics; Munich, Germany"
]
] |
Measurements of $\alpha_s$, the coupling strength of the Strong Interaction between quarks and gluons, are summarised and an updated value of the world average of $\alpha_s (M_Z)$ is derived. Building up on previous reviews, special emphasis is laid on the most recent determinations of $\alpha_s$. These are obtained from $\tau$-decays, from global fits of electroweak precision data and from measurements of the proton structure function $\F_2$, which are based on perturbative QCD calculations up to $O(\alpha_s^4)$; from hadronic event shapes and jet production in $\epem$ annihilation, based on $O(\alpha_s^3) $ QCD; from jet production in deep inelastic scattering and from $\Upsilon$ decays, based on $O(\alpha_s^2) $ QCD; and from heavy quarkonia based on unquenched QCD lattice calculations. Applying pragmatic methods to deal with possibly underestimated errors and/or unknown correlations, the world average value of $\alpha_s (M_Z)$ results in $\alpha_s (M_Z) = 0.1184 \pm 0.0007$. The measured values of $\alpha_s (Q)$, covering energy scales from $Q \equiv \mtau = 1.78$ GeV to 209 GeV, exactly follow the energy dependence predicted by QCD and therefore significantly test the concept af Asymptotic Freedom.
|
hep-ph/0102302
|
Nasrallah
|
N. Nasrallah (Lebanese Uni.)
|
Two photon decay of the pseudoscalars, the chiral symmetry breaking
corrections
|
Computational errors straightened and study of the implications on
the form factors of the transitions gamma gamma* --> pseudoscalars added
| null |
10.1103/PhysRevD.66.076012
| null |
hep-ph
| null |
The extrapolation of the decay amplitudes of the pseudoscalar mesons into two
photons from the soft meson limit where it is obtained from the axial-anomaly
to the mass shell involves the contribution of the 0^ - continuum. These chiral
symmetry breaking corrections turn out to be large. The effects of these
corrections on the calculated pi ^0 decay rate, on the values of the
singlet-octet mixing angle and on the ratios f_8 / f_pi and f_0 / f_pi are
discussed. The implications for the transition form factors gamma gamma* -->
pseudoscalars are also evaluated and confronted with the available experimental
data.
|
[
{
"created": "Sun, 25 Feb 2001 09:48:16 GMT",
"version": "v1"
},
{
"created": "Fri, 29 Jun 2001 17:56:06 GMT",
"version": "v2"
},
{
"created": "Thu, 4 Jul 2002 17:59:22 GMT",
"version": "v3"
}
] |
2009-11-07
|
[
[
"Nasrallah",
"N.",
"",
"Lebanese Uni."
]
] |
The extrapolation of the decay amplitudes of the pseudoscalar mesons into two photons from the soft meson limit where it is obtained from the axial-anomaly to the mass shell involves the contribution of the 0^ - continuum. These chiral symmetry breaking corrections turn out to be large. The effects of these corrections on the calculated pi ^0 decay rate, on the values of the singlet-octet mixing angle and on the ratios f_8 / f_pi and f_0 / f_pi are discussed. The implications for the transition form factors gamma gamma* --> pseudoscalars are also evaluated and confronted with the available experimental data.
|
2003.10068
|
Wan-Ping Zhou
|
Wanping Zhou, Xuesong Mei and Haoxue Qiao
|
The high-order nonrelativistic Hamiltonian of electromagnetic system
| null | null | null | null |
hep-ph physics.atom-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
The nonrelativistic Hamiltonians of scalar, spinor and vector particles in
the electromagnetic field are studied by applying the Douglas-Kroll-Hess
approach. Their relativistic Hamiltonians are expanded on the potential, and
the Hamiltonians containing one- and two-photon potentials are derived. The
nonrelativistic Hamiltonians up to $m\alpha^8$ order are obtained by applying
Taylor expansion on momentum, and the result of spin-1/2 spinor is coincided
with the result obtained by applying scattering matching approach in the
Ref.~[Phys. Rev. A {\bf 100}, 012513 (2019)]. Then, the singularities in
Hamiltonian of Coulomb systems are separated out and cancelled. The regularized
Hamiltonian up to $m\alpha^8$ order for scaler and electron in Coulomb field
are obtained. The numerical results of relativistic corrections are coincided
with the relativistic theory. The regularized Hamiltonian up to $m\alpha^6$ for
multi-electrons in Coulomb field are also derived.
|
[
{
"created": "Mon, 23 Mar 2020 03:51:47 GMT",
"version": "v1"
},
{
"created": "Mon, 13 Jul 2020 15:48:02 GMT",
"version": "v2"
},
{
"created": "Wed, 20 Oct 2021 10:07:28 GMT",
"version": "v3"
},
{
"created": "Tue, 19 Apr 2022 05:12:50 GMT",
"version": "v4"
}
] |
2022-04-20
|
[
[
"Zhou",
"Wanping",
""
],
[
"Mei",
"Xuesong",
""
],
[
"Qiao",
"Haoxue",
""
]
] |
The nonrelativistic Hamiltonians of scalar, spinor and vector particles in the electromagnetic field are studied by applying the Douglas-Kroll-Hess approach. Their relativistic Hamiltonians are expanded on the potential, and the Hamiltonians containing one- and two-photon potentials are derived. The nonrelativistic Hamiltonians up to $m\alpha^8$ order are obtained by applying Taylor expansion on momentum, and the result of spin-1/2 spinor is coincided with the result obtained by applying scattering matching approach in the Ref.~[Phys. Rev. A {\bf 100}, 012513 (2019)]. Then, the singularities in Hamiltonian of Coulomb systems are separated out and cancelled. The regularized Hamiltonian up to $m\alpha^8$ order for scaler and electron in Coulomb field are obtained. The numerical results of relativistic corrections are coincided with the relativistic theory. The regularized Hamiltonian up to $m\alpha^6$ for multi-electrons in Coulomb field are also derived.
|
hep-ph/0104300
|
Alan Kostelecky
|
Don Colladay and Alan Kostelecky
|
Cross Sections and Lorentz Violation
|
17 pages
|
Phys.Lett.B511:209-217,2001
|
10.1016/S0370-2693(01)00649-9
|
IUHET 432, April 2001
|
hep-ph hep-th
| null |
The derivation of cross sections and decay rates in the Lorentz-violating
standard-model extension is discussed. General features of the physics are
described, and some conceptual and calculational issues are addressed. As an
illustrative example, the cross section for the specific process of
electron-positron pair annihilation into two photons is obtained.
|
[
{
"created": "Sun, 29 Apr 2001 16:31:48 GMT",
"version": "v1"
}
] |
2009-09-25
|
[
[
"Colladay",
"Don",
""
],
[
"Kostelecky",
"Alan",
""
]
] |
The derivation of cross sections and decay rates in the Lorentz-violating standard-model extension is discussed. General features of the physics are described, and some conceptual and calculational issues are addressed. As an illustrative example, the cross section for the specific process of electron-positron pair annihilation into two photons is obtained.
|
hep-ph/9602274
| null |
E. Nikolov, W. Broniowski, C. V. Christov, G. Ripka, K. Goeke
|
Meson loops in the Nambu-Jona-Lasinio model
|
revised version
|
Nucl.Phys. A608 (1996) 411-436
|
10.1016/0375-9474(96)00231-X
|
RUB-TPII-13/95
|
hep-ph
| null |
The effects of meson loops in the vacuum sector of the Nambu--Jona-Lasinio
model are calculated. Using the effective action formalism we take consistently
all next-to-leading-order $1 \over \Nc$ terms into account. This leads to a
symmetry-conserving approach, in which all features of spontaneously broken
chiral symmetry, such as the Goldstone theorem, the Gold\-ber\-ger--Treiman and
the Gell-Mann--Oakes--Renner relations are preserved. Contributions to $\langle
\overline{q}q \rangle$ and $F_\pi$ are calculated, and are shown to be
substantial, at the level of $\sim 30\%$, consistent with the $1 \over \Nc$
expansion. The leading nonanalytic terms in the chiral expansion of $\langle
\overline{q}q \rangle$, $F_\pi$ and $m_\pi$ agree have the same form as the
one-loop results of chiral perturbation theory.
|
[
{
"created": "Mon, 12 Feb 1996 11:45:30 GMT",
"version": "v1"
},
{
"created": "Tue, 21 May 1996 12:44:56 GMT",
"version": "v2"
}
] |
2009-10-28
|
[
[
"Nikolov",
"E.",
""
],
[
"Broniowski",
"W.",
""
],
[
"Christov",
"C. V.",
""
],
[
"Ripka",
"G.",
""
],
[
"Goeke",
"K.",
""
]
] |
The effects of meson loops in the vacuum sector of the Nambu--Jona-Lasinio model are calculated. Using the effective action formalism we take consistently all next-to-leading-order $1 \over \Nc$ terms into account. This leads to a symmetry-conserving approach, in which all features of spontaneously broken chiral symmetry, such as the Goldstone theorem, the Gold\-ber\-ger--Treiman and the Gell-Mann--Oakes--Renner relations are preserved. Contributions to $\langle \overline{q}q \rangle$ and $F_\pi$ are calculated, and are shown to be substantial, at the level of $\sim 30\%$, consistent with the $1 \over \Nc$ expansion. The leading nonanalytic terms in the chiral expansion of $\langle \overline{q}q \rangle$, $F_\pi$ and $m_\pi$ agree have the same form as the one-loop results of chiral perturbation theory.
|
0711.1736
|
Wolfgang Lucha
|
Wolfgang Lucha, F. Schoberl
|
Stability of the Solutions of Instantaneous Bethe-Salpeter Equations
with Confining Interactions
|
4 pages, to appear in the Proceedings of Hadron 07, XII International
Conference on Hadron Spectroscopy, Frascati (Rome), Italy, October 8-13, 2007
|
XII International Conference on Hadron Spectroscopy - Hadron 07,
edited by L. Benussi et al., Frascati Physics Series 46 (2007) 1539-1542
| null |
HEPHY-PUB 856/07
|
hep-ph astro-ph nucl-th
| null |
For two bound-state equations derived as simplified forms of the
Bethe-Salpeter equation with confining interaction, stability of all solutions
is rigorously shown.
|
[
{
"created": "Mon, 12 Nov 2007 10:25:13 GMT",
"version": "v1"
}
] |
2009-07-17
|
[
[
"Lucha",
"Wolfgang",
""
],
[
"Schoberl",
"F.",
""
]
] |
For two bound-state equations derived as simplified forms of the Bethe-Salpeter equation with confining interaction, stability of all solutions is rigorously shown.
|
1711.06271
|
Ariel Zhitnitsky
|
Shuailiang Ge, Xunyu Liang and Ariel Zhitnitsky
|
Cosmological Axion and Quark Nugget Dark Matter Model
|
matches the published version
|
Phys. Rev. D 97, 043008 (2018)
|
10.1103/PhysRevD.97.043008
| null |
hep-ph astro-ph.CO
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We study a dark matter (DM) model offering a very natural explanation of two
(naively unrelated) problems in cosmology: the observed relation $\Omega_{\rm
DM}\sim\Omega_{\rm visible}$ and the observed asymmetry between matter and
antimatter in the Universe, known as the "baryogenesis" problem. In this
framework, both types of matter (dark and visible) have the same QCD origin,
form at the same QCD epoch, and both proportional to one and the same
dimensional parameter of the system, $\Lambda_{\rm QCD}$, which explains how
these two, naively distinct, problems could be intimately related, and could be
solved simultaneously within the same framework. More specifically, the DM in
this model is composed by two different ingredients: the (well- studied) DM
axions and (less-studied) the quark nuggets made of matter or antimatter. The
focus of the present work is the quantitative analysis of the relation between
these two distinct components contributing to the dark sector of the theory
determined by $\Omega_{\rm DM}\equiv [\Omega_{\rm DM}(\rm nuggets)+ \Omega_{\rm
DM}(\rm axion)]$. We argue that the nugget's DM component always traces the
visible matter density, i.e. $\Omega_{\rm DM}(\rm nuggets)\sim\Omega_{\rm
visible}$ and this feature is not sensitive to the parameters of the system
such as the axion mass $m_a$ or the misalignment angle $\theta_0$. It should be
contrasted with conventional axion production mechanism due to the misalignment
when $\Omega_{\rm DM}(\rm axion)$ is highly sensitive to the axion mass $m_a$
and the initial misalignment angle $\theta_0$. We also discuss the constraints
on this model related to the inflationary scale $H_I$, non-observation of the
isocurvature perturbations, $r_T < 0.12$, and also, varies axions search
experiments.
|
[
{
"created": "Thu, 16 Nov 2017 19:00:01 GMT",
"version": "v1"
},
{
"created": "Mon, 22 Jan 2018 19:28:55 GMT",
"version": "v2"
}
] |
2018-02-21
|
[
[
"Ge",
"Shuailiang",
""
],
[
"Liang",
"Xunyu",
""
],
[
"Zhitnitsky",
"Ariel",
""
]
] |
We study a dark matter (DM) model offering a very natural explanation of two (naively unrelated) problems in cosmology: the observed relation $\Omega_{\rm DM}\sim\Omega_{\rm visible}$ and the observed asymmetry between matter and antimatter in the Universe, known as the "baryogenesis" problem. In this framework, both types of matter (dark and visible) have the same QCD origin, form at the same QCD epoch, and both proportional to one and the same dimensional parameter of the system, $\Lambda_{\rm QCD}$, which explains how these two, naively distinct, problems could be intimately related, and could be solved simultaneously within the same framework. More specifically, the DM in this model is composed by two different ingredients: the (well- studied) DM axions and (less-studied) the quark nuggets made of matter or antimatter. The focus of the present work is the quantitative analysis of the relation between these two distinct components contributing to the dark sector of the theory determined by $\Omega_{\rm DM}\equiv [\Omega_{\rm DM}(\rm nuggets)+ \Omega_{\rm DM}(\rm axion)]$. We argue that the nugget's DM component always traces the visible matter density, i.e. $\Omega_{\rm DM}(\rm nuggets)\sim\Omega_{\rm visible}$ and this feature is not sensitive to the parameters of the system such as the axion mass $m_a$ or the misalignment angle $\theta_0$. It should be contrasted with conventional axion production mechanism due to the misalignment when $\Omega_{\rm DM}(\rm axion)$ is highly sensitive to the axion mass $m_a$ and the initial misalignment angle $\theta_0$. We also discuss the constraints on this model related to the inflationary scale $H_I$, non-observation of the isocurvature perturbations, $r_T < 0.12$, and also, varies axions search experiments.
|
1004.4390
|
Alexander S. Sakharov
|
Edward K.G. Sarkisyan and Alexander S. Sakharov
|
Relating multihadron production in hadronic and nuclear collisions
|
Europ. Phys. J. C (to appear). Recently CMS reported
(arXiv:1005.3299) on the midrapidity density value of 5.78 +/- 0.01(stat) +/-
0.23(syst) in pp collisons at 7 TeV, which agrees well with the value of 5.8
of our predictions
|
Eur.Phys.J.C70:533-541,2010
|
10.1140/epjc/s10052-010-1493-1
| null |
hep-ph hep-ex nucl-ex
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
The energy-dependence of charged particle mean multiplicity and
pseudorapidity density at midrapidity measured in nucleus-nucleus and
(anti)proton-proton collisions are studied in the entire available energy
range. The study is performed using a model, which considers the multiparticle
production process according to the dissipating energy of the participants and
their types, namely a combination of the constituent quark picture together
with Landau relativistic hydrodynamics. The model reveals interrelations
between the variables under study measured in nucleus-nucleus and
nucleon-nucleon collisions. Measurements in nuclear reactions are shown to be
well reproduced by the measurements in (anti)proton-proton interactions common
and the corresponding fits are presented. Different observations in other types
of collisions are discussed in the framework of the proposed model. Predictions
are made for measurements at the forthcoming LHC energies.
|
[
{
"created": "Sun, 25 Apr 2010 23:30:17 GMT",
"version": "v1"
},
{
"created": "Fri, 14 May 2010 17:20:45 GMT",
"version": "v2"
},
{
"created": "Thu, 11 Nov 2010 14:28:15 GMT",
"version": "v3"
}
] |
2010-12-15
|
[
[
"Sarkisyan",
"Edward K. G.",
""
],
[
"Sakharov",
"Alexander S.",
""
]
] |
The energy-dependence of charged particle mean multiplicity and pseudorapidity density at midrapidity measured in nucleus-nucleus and (anti)proton-proton collisions are studied in the entire available energy range. The study is performed using a model, which considers the multiparticle production process according to the dissipating energy of the participants and their types, namely a combination of the constituent quark picture together with Landau relativistic hydrodynamics. The model reveals interrelations between the variables under study measured in nucleus-nucleus and nucleon-nucleon collisions. Measurements in nuclear reactions are shown to be well reproduced by the measurements in (anti)proton-proton interactions common and the corresponding fits are presented. Different observations in other types of collisions are discussed in the framework of the proposed model. Predictions are made for measurements at the forthcoming LHC energies.
|
hep-ph/0308297
|
Martin Melcher
|
Alexander Khodjamirian, Thomas Mannel, Martin Melcher
|
Flavour SU(3) Symmetry in Charmless B Decays
|
Two references added, version to be published in Phys.Rev.D, 21
pages, 12 postscript figures
|
Phys.Rev. D68 (2003) 114007
|
10.1103/PhysRevD.68.114007
|
TTP03-18
|
hep-ph
| null |
QCD sum rules are used to estimate the flavour SU(3)-symmetry violation in
two-body B decays to pions and kaons. In the factorizable amplitudes the
SU(3)-violation manifests itself in the ratio of the decay constants f_K/f_pi
and in the differences between the B->K, B_s->K and B->pi form factors. These
effects are calculated from the QCD two-point and light-cone sum rules,
respectively, in terms of the strange quark mass and the ratio of the strange
and nonstrange quark-condensate densities. Importantly, QCD sum rules predict
that SU(3) breaking in the heavy-to-light form factors can be substantial and
does not vanish in the heavy-quark mass limit. Furthermore, we investigate the
strange-quark mass dependence of nonfactorizable effects in the B->K pi decay
amplitudes. Taking into account these effects we estimate the accuracy of
several SU(3)-symmetry relations between charmless B-decay amplitudes.
|
[
{
"created": "Thu, 28 Aug 2003 13:18:00 GMT",
"version": "v1"
},
{
"created": "Thu, 27 Nov 2003 19:32:10 GMT",
"version": "v2"
}
] |
2009-11-10
|
[
[
"Khodjamirian",
"Alexander",
""
],
[
"Mannel",
"Thomas",
""
],
[
"Melcher",
"Martin",
""
]
] |
QCD sum rules are used to estimate the flavour SU(3)-symmetry violation in two-body B decays to pions and kaons. In the factorizable amplitudes the SU(3)-violation manifests itself in the ratio of the decay constants f_K/f_pi and in the differences between the B->K, B_s->K and B->pi form factors. These effects are calculated from the QCD two-point and light-cone sum rules, respectively, in terms of the strange quark mass and the ratio of the strange and nonstrange quark-condensate densities. Importantly, QCD sum rules predict that SU(3) breaking in the heavy-to-light form factors can be substantial and does not vanish in the heavy-quark mass limit. Furthermore, we investigate the strange-quark mass dependence of nonfactorizable effects in the B->K pi decay amplitudes. Taking into account these effects we estimate the accuracy of several SU(3)-symmetry relations between charmless B-decay amplitudes.
|
hep-ph/0106078
|
Guennady Kozlov
|
G.A. Kozlov
|
The Bose-Einstein distribution functions and the multiparticle
production at high energies
|
18 pages, LaTeX, no figures, no tables
|
NewJ.Phys.4:23,2002
|
10.1088/1367-2630/4/1/323
| null |
hep-ph
| null |
The evolution properties of propagating particles produced at high energies
in a randomly distributed environment are studied. The finite size of the phase
space of the multiparticle production region as well as the chaoticity can be
derived.
|
[
{
"created": "Thu, 7 Jun 2001 12:34:05 GMT",
"version": "v1"
}
] |
2008-11-26
|
[
[
"Kozlov",
"G. A.",
""
]
] |
The evolution properties of propagating particles produced at high energies in a randomly distributed environment are studied. The finite size of the phase space of the multiparticle production region as well as the chaoticity can be derived.
|
1205.1391
|
Michael Paraskevas
|
M. Paraskevas, K. Tamvakis
|
On Discrete R-Symmetries in MSSM and its Extensions
|
14 pages
| null |
10.1103/PhysRevD.86.015009
| null |
hep-ph hep-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We study possible anomaly-free discrete R-symmetries that avoid the
\mu-problem and the dangerous D\leq 5 operators considering charge assignments
that do not commute with the traditional grand unifying simple groups, such as
SU(5) or SO(10), but commute instead with the so-called flipped-SU(5), with or
without the operation of the GS mechanism. We find Z_N symmetries with N = 3, 6
in the anomaly-free case or N = 3, 4, 6, 8, 12, 24 in the case of anomaly
cancellation through the Green-Schwartz mechanism. Non-unified cases (Z_5) have
also been discussed. We also confront the construction of a 4D grand unified
flipped-SU(5) model endowed with Z_N and find phenomenologically acceptable
solutions with N = 2k+7 and N = 2k+10.
|
[
{
"created": "Mon, 7 May 2012 14:05:56 GMT",
"version": "v1"
}
] |
2013-05-30
|
[
[
"Paraskevas",
"M.",
""
],
[
"Tamvakis",
"K.",
""
]
] |
We study possible anomaly-free discrete R-symmetries that avoid the \mu-problem and the dangerous D\leq 5 operators considering charge assignments that do not commute with the traditional grand unifying simple groups, such as SU(5) or SO(10), but commute instead with the so-called flipped-SU(5), with or without the operation of the GS mechanism. We find Z_N symmetries with N = 3, 6 in the anomaly-free case or N = 3, 4, 6, 8, 12, 24 in the case of anomaly cancellation through the Green-Schwartz mechanism. Non-unified cases (Z_5) have also been discussed. We also confront the construction of a 4D grand unified flipped-SU(5) model endowed with Z_N and find phenomenologically acceptable solutions with N = 2k+7 and N = 2k+10.
|
hep-ph/9210234
|
Fred Cooper
|
F.Cooper, H. Shepard, C Lucheroni and P. Sodano
|
Post-Gaussian Varioational Method for the Nonlinear Schrodinger Equation
|
12pages Latex (figures available on request)
| null |
10.1016/0167-2789(93)90129-O
|
LAUR 92-2869
|
hep-ph
| null |
Gaussians to study soliton behavior and blowup in the nonlinear Schrodinger
equation in arbitrary dimension d and with arbitrary nonlinearity parameter
kappa
|
[
{
"created": "Wed, 14 Oct 1992 17:42:11 GMT",
"version": "v1"
}
] |
2009-10-22
|
[
[
"Cooper",
"F.",
""
],
[
"Shepard",
"H.",
""
],
[
"Lucheroni",
"C",
""
],
[
"Sodano",
"P.",
""
]
] |
Gaussians to study soliton behavior and blowup in the nonlinear Schrodinger equation in arbitrary dimension d and with arbitrary nonlinearity parameter kappa
|
1511.08858
|
Yithsbey Giraldo
|
Yithsbey Giraldo and Eduardo Rojas
|
CKM mixings from mass matrices with five texture zeros
|
Accepted for publication in Physical Review D. 10 pages
|
Phys. Rev. D 104, 075009 (2021)
|
10.1103/PhysRevD.104.075009
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
In this work we carry out an exhaustive study to find quark mass matrices in
the Standard Model~(SM), with the maximum number of texture zeros consistent
with the experimental data. We found four viable configurations of five texture
zeros that adjust the quark masses, the mixing angles and the CP violation
phase, with deviations below $1\sigma$ level respect to the current SM best fit
values. One of the most important aspects of this work is an economic procedure
to find the texture zeros: we resort to the weak basis transformation method,
which, as we will show, exhaustively search every possible configuration. We
report various leading order relations between the mixing angles and the quark
masses for each case.
|
[
{
"created": "Sat, 28 Nov 2015 01:19:19 GMT",
"version": "v1"
},
{
"created": "Mon, 3 May 2021 18:11:05 GMT",
"version": "v2"
},
{
"created": "Mon, 20 Sep 2021 04:10:16 GMT",
"version": "v3"
}
] |
2021-10-13
|
[
[
"Giraldo",
"Yithsbey",
""
],
[
"Rojas",
"Eduardo",
""
]
] |
In this work we carry out an exhaustive study to find quark mass matrices in the Standard Model~(SM), with the maximum number of texture zeros consistent with the experimental data. We found four viable configurations of five texture zeros that adjust the quark masses, the mixing angles and the CP violation phase, with deviations below $1\sigma$ level respect to the current SM best fit values. One of the most important aspects of this work is an economic procedure to find the texture zeros: we resort to the weak basis transformation method, which, as we will show, exhaustively search every possible configuration. We report various leading order relations between the mixing angles and the quark masses for each case.
|
hep-ph/0001020
|
Lon-chang Liu
|
L. C. Liu and Wei-hsing Ma
|
The Xi(2230) Meson and The Pomeron Trajectory
|
9 pages
|
J.Phys.G26:L59-L63,2000
|
10.1088/0954-3899/26/3/103
| null |
hep-ph
| null |
We examine the possibility that the xi(2230) meson is a member of the Pomeron
trajectory. A method of connecting the xi --> p pbar decay width and the pp
cross sections through the Pomeron residue function is presented. We have used
a relativistic, singularity-free form factor to make the analytic continuation
of the residue function between crossed channels. We predict that if the
xi(2230) meson is a Pomeron, then it should have a xi --> p pbar decay width of
about 2 MeV.
|
[
{
"created": "Mon, 3 Jan 2000 23:48:58 GMT",
"version": "v1"
}
] |
2009-10-31
|
[
[
"Liu",
"L. C.",
""
],
[
"Ma",
"Wei-hsing",
""
]
] |
We examine the possibility that the xi(2230) meson is a member of the Pomeron trajectory. A method of connecting the xi --> p pbar decay width and the pp cross sections through the Pomeron residue function is presented. We have used a relativistic, singularity-free form factor to make the analytic continuation of the residue function between crossed channels. We predict that if the xi(2230) meson is a Pomeron, then it should have a xi --> p pbar decay width of about 2 MeV.
|
1906.01534
|
Alexander Rothkopf
|
Alexander Rothkopf
|
Quarkonium Production in the QGP
|
9 pages, 2 figures, talk given at the 19th Zimanyi school winter
workshop, December 2-6 2018, Budapest, Hungary
| null |
10.3390/universe5050117
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We report on recent theory progress in understanding the production of heavy
quarkonium in heavy-ion collisions based on the in-medium heavy-quark potential
extracted from lattice QCD simulations. On the one hand, the proper in-medium
potential allows us to study the spectral properties of heavy quarkonium in
thermal equilibrium, from which we estimate the $\psi^\prime$ to $J/\psi$ ratio
in heavy-ion collisions. On the other hand, the potential provides a central
ingredient in the description of the real-time evolution of heavy-quarkonium
formulated in the open-quantum-systems framework.
|
[
{
"created": "Tue, 4 Jun 2019 15:47:55 GMT",
"version": "v1"
}
] |
2019-06-05
|
[
[
"Rothkopf",
"Alexander",
""
]
] |
We report on recent theory progress in understanding the production of heavy quarkonium in heavy-ion collisions based on the in-medium heavy-quark potential extracted from lattice QCD simulations. On the one hand, the proper in-medium potential allows us to study the spectral properties of heavy quarkonium in thermal equilibrium, from which we estimate the $\psi^\prime$ to $J/\psi$ ratio in heavy-ion collisions. On the other hand, the potential provides a central ingredient in the description of the real-time evolution of heavy-quarkonium formulated in the open-quantum-systems framework.
|
hep-ph/0202054
|
Mario E. Gomez
|
D. F. Carvalho, M. E. Gomez, J. C. Romao
|
Charged lepton Flavor Violation in Supersymmetry with Bilinear R-Parity
Violation
|
29 pages, 8 figures. Constraint from solar neutrino data included,
conclusions changed respect v1
|
Phys.Rev. D65 (2002) 093013
|
10.1103/PhysRevD.65.093013
| null |
hep-ph
| null |
The simplest unified extension of the Minimal Supersymmetric Standard Model
with bi-linear R-parity violation naturally predicts a hierarchical neutrino
mass spectrum, suitable to explain atmospheric and solar neutrino fluxes. We
study whether the individual violation of the lepton numbers L_{e,mu,tau} in
the charged sector can lead to measurable rates for BR(mu->e gamma)and
$BR(tau-> mu gamma). We find that some of the R-parity violating terms that are
compatible with the observed atmospheric neutrino oscillations could lead to
rates for mu->e gamma measurable in projected experiments. However, the Delta
m^2_{12} obtained for those parameters is too high to be compatible with the
solar neutrino data, excluding therefore the possibility of having measurable
rates for mu->e gamma in the model.
|
[
{
"created": "Wed, 6 Feb 2002 16:41:14 GMT",
"version": "v1"
},
{
"created": "Mon, 18 Feb 2002 23:32:19 GMT",
"version": "v2"
}
] |
2009-11-07
|
[
[
"Carvalho",
"D. F.",
""
],
[
"Gomez",
"M. E.",
""
],
[
"Romao",
"J. C.",
""
]
] |
The simplest unified extension of the Minimal Supersymmetric Standard Model with bi-linear R-parity violation naturally predicts a hierarchical neutrino mass spectrum, suitable to explain atmospheric and solar neutrino fluxes. We study whether the individual violation of the lepton numbers L_{e,mu,tau} in the charged sector can lead to measurable rates for BR(mu->e gamma)and $BR(tau-> mu gamma). We find that some of the R-parity violating terms that are compatible with the observed atmospheric neutrino oscillations could lead to rates for mu->e gamma measurable in projected experiments. However, the Delta m^2_{12} obtained for those parameters is too high to be compatible with the solar neutrino data, excluding therefore the possibility of having measurable rates for mu->e gamma in the model.
|
1606.00419
|
Samuel Wallon
|
R. Boussarie, A. V. Grabovsky, L. Szymanowski, S. Wallon
|
On the one loop $\gamma^{(*)}\to q\bar{q}$ impact factor and the
exclusive diffractive cross sections for the production of two or three jets
|
54 pages, 2 figures
| null |
10.1007/JHEP11(2016)149
|
LPT-Orsay-16-44
|
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We present the calculation of the impact factor for the $\gamma^{(*)}\to
q\bar{q}$ transition with one loop accuracy in arbitrary kinematics. The
calculation was done within Balitsky's high energy operator expansion. Together
with our previous result for the $\gamma^{(*)}\to q\bar{q} g$ Born impact
factor it allows one to derive cross-sections for 2- (one loop) and 3-jet
(Born) difractive electroproduction. We write such cross sections for the 2 and
3 jet exclusive diffractive electroproduction off a proton in terms of hadronic
matrix elements of Wilson lines. For the 2-jet cross section we demonstrate the
cancellation of IR, collinear and rapidity singularities. Our result can be
directly exploited to describe the recently analyzed data on exclusive dijet
production at HERA and used for the study of jet photoproduction in
ultraperipheral proton or nuclear scattering.
|
[
{
"created": "Wed, 1 Jun 2016 19:42:22 GMT",
"version": "v1"
}
] |
2016-12-21
|
[
[
"Boussarie",
"R.",
""
],
[
"Grabovsky",
"A. V.",
""
],
[
"Szymanowski",
"L.",
""
],
[
"Wallon",
"S.",
""
]
] |
We present the calculation of the impact factor for the $\gamma^{(*)}\to q\bar{q}$ transition with one loop accuracy in arbitrary kinematics. The calculation was done within Balitsky's high energy operator expansion. Together with our previous result for the $\gamma^{(*)}\to q\bar{q} g$ Born impact factor it allows one to derive cross-sections for 2- (one loop) and 3-jet (Born) difractive electroproduction. We write such cross sections for the 2 and 3 jet exclusive diffractive electroproduction off a proton in terms of hadronic matrix elements of Wilson lines. For the 2-jet cross section we demonstrate the cancellation of IR, collinear and rapidity singularities. Our result can be directly exploited to describe the recently analyzed data on exclusive dijet production at HERA and used for the study of jet photoproduction in ultraperipheral proton or nuclear scattering.
|
hep-ph/0507030
|
Minaketan Parida
|
M. K. Parida and B. D. Cajee
|
High scale perturbative gauge coupling in R-parity conserving SUSY
SO(10) with longer proton lifetime
|
11 pages epjc LaTex as per specifications of European Physical
Journal C
|
Eur.Phys.J.C44:447-457,2005
|
10.1140/epjc/s2005-02374-x
|
NEHU/PHY-MP-04/05
|
hep-ph astro-ph
| null |
It is well known that in single step breaking of R-parity conserving SUSY
SO(10) that needs the Higgs representations $126+\bar 126$ the GUT-gauge
coupling violates the perturbative constraint at mass scales few times larger
than the GUT scale. Therefore, if the SO(10) gauge coupling is to remain
perturbative up the Planck scale(=2x10^{18} GeV), the scale $M_U$ of GUT
symmetry breaking is to be bounded from below. The bound depends upon specific
Higgs representations used for SO(10) symmetry breaking but, as we find, can
not be lower than $1.5x10^{17}$ GeV. In order to obtain such high unification
scale we propose a two-step SO(10) breaking through
$SU(2)_LXSU(2)_RXU(1)_{B-L}XSU(3)_C(g_{2L} \neq g_{2R})$ intermediate gauge
symmetry. We estimate potential threshold and gravitational corrections to the
running of gauge couplings and show that they can make the picture of
perturbative GUT- gauge coupling running consistent at least up to the Planck
scale. We also show that when $SO(10) \to G_{2213}$ by $210 + 54$,
gravitational corrections alone with negligible threshold effects may guarantee
such perturbative gauge coupling. The lifetime of the proton is found to
increase by nearly 6 orders over the current experimental limit for $p \to
e^+\pi^0$. For the proton decay mediated by dim.5 operator a wide range of
lifetimes is possible extending from the current experimental limit up to
values 2-3 orders longer.
|
[
{
"created": "Sun, 3 Jul 2005 11:52:38 GMT",
"version": "v1"
},
{
"created": "Thu, 25 Aug 2005 05:46:19 GMT",
"version": "v2"
},
{
"created": "Sun, 4 Sep 2005 12:30:40 GMT",
"version": "v3"
},
{
"created": "Sat, 24 Sep 2005 06:03:35 GMT",
"version": "v4"
}
] |
2009-01-07
|
[
[
"Parida",
"M. K.",
""
],
[
"Cajee",
"B. D.",
""
]
] |
It is well known that in single step breaking of R-parity conserving SUSY SO(10) that needs the Higgs representations $126+\bar 126$ the GUT-gauge coupling violates the perturbative constraint at mass scales few times larger than the GUT scale. Therefore, if the SO(10) gauge coupling is to remain perturbative up the Planck scale(=2x10^{18} GeV), the scale $M_U$ of GUT symmetry breaking is to be bounded from below. The bound depends upon specific Higgs representations used for SO(10) symmetry breaking but, as we find, can not be lower than $1.5x10^{17}$ GeV. In order to obtain such high unification scale we propose a two-step SO(10) breaking through $SU(2)_LXSU(2)_RXU(1)_{B-L}XSU(3)_C(g_{2L} \neq g_{2R})$ intermediate gauge symmetry. We estimate potential threshold and gravitational corrections to the running of gauge couplings and show that they can make the picture of perturbative GUT- gauge coupling running consistent at least up to the Planck scale. We also show that when $SO(10) \to G_{2213}$ by $210 + 54$, gravitational corrections alone with negligible threshold effects may guarantee such perturbative gauge coupling. The lifetime of the proton is found to increase by nearly 6 orders over the current experimental limit for $p \to e^+\pi^0$. For the proton decay mediated by dim.5 operator a wide range of lifetimes is possible extending from the current experimental limit up to values 2-3 orders longer.
|
1808.00293
|
Atri Bhattacharya
|
Atri Bhattacharya and J. R. Cudell
|
Forward charm-production models and prompt neutrinos at IceCube
|
10 pages, 6 figures; v2: Improved discussion, figures; no changes in
results; version accepted for publication in JHEP
| null |
10.1007/JHEP11(2018)150
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We investigate the prompt neutrino background at IceCube, as determined from
forward charm. We consider the role of intrinsic charm and of a recombination
model and show that the contribution of these mechanisms is at most a factor
two.
|
[
{
"created": "Wed, 1 Aug 2018 12:19:02 GMT",
"version": "v1"
},
{
"created": "Wed, 14 Nov 2018 13:57:16 GMT",
"version": "v2"
}
] |
2018-12-05
|
[
[
"Bhattacharya",
"Atri",
""
],
[
"Cudell",
"J. R.",
""
]
] |
We investigate the prompt neutrino background at IceCube, as determined from forward charm. We consider the role of intrinsic charm and of a recombination model and show that the contribution of these mechanisms is at most a factor two.
|
2310.14937
|
Zhi-Yong Zhou
|
Zhiguang Xiao, Zhi-Yong Zhou
|
On the generalized Friedrichs-Lee model with multiple discrete and
continuous states
|
25 pages, 2 figures
| null | null | null |
hep-ph math-ph math.MP nucl-th quant-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
In this study, we present several improvements of the non-relativistic
Friedrichs-Lee model with multiple discrete and continuous states and still
retain its solvability. Our findings establish a solid theoretical basis for
the exploration of resonance phenomena in scenarios involving the presence of
multiple interfering states across various channels. The scattering amplitudes
associated with the continuous states naturally adhere to coupled-channel
unitarity, rendering this framework particularly valuable for investigating
hadronic resonant states appearing in multiple coupled channels. Moreover, this
generalized framework exhibits a wide-range applicability, enabling
investigations into resonance phenomena across diverse physical domains,
including hadron physics, nuclear physics, optics, and cold atom physics, among
others.
|
[
{
"created": "Mon, 23 Oct 2023 13:36:14 GMT",
"version": "v1"
}
] |
2023-10-24
|
[
[
"Xiao",
"Zhiguang",
""
],
[
"Zhou",
"Zhi-Yong",
""
]
] |
In this study, we present several improvements of the non-relativistic Friedrichs-Lee model with multiple discrete and continuous states and still retain its solvability. Our findings establish a solid theoretical basis for the exploration of resonance phenomena in scenarios involving the presence of multiple interfering states across various channels. The scattering amplitudes associated with the continuous states naturally adhere to coupled-channel unitarity, rendering this framework particularly valuable for investigating hadronic resonant states appearing in multiple coupled channels. Moreover, this generalized framework exhibits a wide-range applicability, enabling investigations into resonance phenomena across diverse physical domains, including hadron physics, nuclear physics, optics, and cold atom physics, among others.
|
hep-ph/9702308
|
Dharam V. Ahluwalia
|
D. V. Ahluwalia and T. Goldman (LANL)
|
Interplay of Non-Relativistic and Relativistic Effects in Neutrino
Oscillations
|
Revtex 3.0, 12 pages
|
Phys.Rev.D56:1698-1703,1997
|
10.1103/PhysRevD.56.1698
|
LA-UR-97-541
|
hep-ph
| null |
A theoretical structure that involves neutrino mass eigenstates at non
relativistic as well as relativistic energies is presented. Using this
framework, we find that if the particle X, with mass 33.9 MeV, of the KARMEN
collaboration anomaly is identified with the third neutrino mass eigenstate,
then the present limit of 23 MeV upper bound on the tau neutrino mass implies
|U_{\tau 3}| < 0.82.
|
[
{
"created": "Wed, 12 Feb 1997 17:28:22 GMT",
"version": "v1"
}
] |
2008-11-26
|
[
[
"Ahluwalia",
"D. V.",
"",
"LANL"
],
[
"Goldman",
"T.",
"",
"LANL"
]
] |
A theoretical structure that involves neutrino mass eigenstates at non relativistic as well as relativistic energies is presented. Using this framework, we find that if the particle X, with mass 33.9 MeV, of the KARMEN collaboration anomaly is identified with the third neutrino mass eigenstate, then the present limit of 23 MeV upper bound on the tau neutrino mass implies |U_{\tau 3}| < 0.82.
|
1505.07078
|
Mohammadmehdi Ettefaghi
|
M. M. Ettefaghi and Z. Askaripour Ravari
|
Neutral current neutrino oscillation via quantum field theory approach
|
to appear in PLB
| null | null | null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Neutrino and anti-neutrino states coming from the neutral current or $Z_0$
decay are blind with respect to the flavor. The neutrino oscillation is
observed and formulated when its flavor is known. However, it has been shown
that we can see neutrino oscillation pattern for $Z_0$ decay neutrinos provided
that both neutrino and anti-neutrino are detected. In this paper, we restudy
this oscillation via quantum field theory approach. Through this approach, we
find that the oscillation pattern ceases if the distance between the detectors
is larger than the coherence length, while both neutrino and antineutrino
states may be coherent. Also the uncertainty of source (region of $Z_0$ decay)
does not have any role in the coherency of neutrino and antineutrino.
|
[
{
"created": "Tue, 26 May 2015 18:58:56 GMT",
"version": "v1"
}
] |
2015-05-27
|
[
[
"Ettefaghi",
"M. M.",
""
],
[
"Ravari",
"Z. Askaripour",
""
]
] |
Neutrino and anti-neutrino states coming from the neutral current or $Z_0$ decay are blind with respect to the flavor. The neutrino oscillation is observed and formulated when its flavor is known. However, it has been shown that we can see neutrino oscillation pattern for $Z_0$ decay neutrinos provided that both neutrino and anti-neutrino are detected. In this paper, we restudy this oscillation via quantum field theory approach. Through this approach, we find that the oscillation pattern ceases if the distance between the detectors is larger than the coherence length, while both neutrino and antineutrino states may be coherent. Also the uncertainty of source (region of $Z_0$ decay) does not have any role in the coherency of neutrino and antineutrino.
|
1305.7049
|
Jordy Vries de
|
E. Mereghetti, J. de Vries, R. G. E. Timmermans, and U. van Kolck
|
Toroidal Quadrupole Form Factor of the Deuteron
| null |
Phys. Rev. C 88, 034001 (2013)
|
10.1103/PhysRevC.88.034001
| null |
hep-ph nucl-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We calculate the toroidal quadrupole moment and form factor of the deuteron,
which violate time-reversal symmetry but conserve parity, at leading order in
two-flavor chiral effective field theory with perturbative pion exchange. We
take into account time-reversal and parity violation due to the QCD vacuum
angle combined with parity violation resulting from the weak interaction in the
Standard Model. We also consider time-reversal and parity violation that at the
quark-gluon level results from effective dimension-six operators originating
from physics beyond the Standard Model.
|
[
{
"created": "Thu, 30 May 2013 10:08:05 GMT",
"version": "v1"
}
] |
2013-09-18
|
[
[
"Mereghetti",
"E.",
""
],
[
"de Vries",
"J.",
""
],
[
"Timmermans",
"R. G. E.",
""
],
[
"van Kolck",
"U.",
""
]
] |
We calculate the toroidal quadrupole moment and form factor of the deuteron, which violate time-reversal symmetry but conserve parity, at leading order in two-flavor chiral effective field theory with perturbative pion exchange. We take into account time-reversal and parity violation due to the QCD vacuum angle combined with parity violation resulting from the weak interaction in the Standard Model. We also consider time-reversal and parity violation that at the quark-gluon level results from effective dimension-six operators originating from physics beyond the Standard Model.
|
hep-ph/9807524
|
Keith L. Frost
|
Keith L. Frost and Laurence G. Yaffe
|
Periodic Euclidean Solutions of SU(2)-Higgs Theory
|
Results in Figure 6, and following discussion, corrected. References
added. Results recently confirmed by direct calculation
|
Phys.Rev.D59:065013,1999
|
10.1103/PhysRevD.59.065013
|
UW/PT 98-9
|
hep-ph
| null |
We examine periodic, spherically symmetric, classical solutions of
SU(2)-Higgs theory in four-dimensional Euclidean space. Classical perturbation
theory is used to construct periodic time-dependent solutions in the
neighborhood of the static sphaleron. The behavior of the action, as a function
of period, changes character depending on the value of the Higgs mass. The
required pattern of bifurcations of solutions as a function of Higgs mass is
examined, and implications for the temperature dependence of the baryon number
violation rate in the Standard Model are discussed.
|
[
{
"created": "Tue, 28 Jul 1998 21:33:36 GMT",
"version": "v1"
},
{
"created": "Sat, 14 Nov 1998 01:22:17 GMT",
"version": "v2"
},
{
"created": "Fri, 4 Dec 1998 21:03:01 GMT",
"version": "v3"
}
] |
2010-11-19
|
[
[
"Frost",
"Keith L.",
""
],
[
"Yaffe",
"Laurence G.",
""
]
] |
We examine periodic, spherically symmetric, classical solutions of SU(2)-Higgs theory in four-dimensional Euclidean space. Classical perturbation theory is used to construct periodic time-dependent solutions in the neighborhood of the static sphaleron. The behavior of the action, as a function of period, changes character depending on the value of the Higgs mass. The required pattern of bifurcations of solutions as a function of Higgs mass is examined, and implications for the temperature dependence of the baryon number violation rate in the Standard Model are discussed.
|
1901.09853
|
Felix Driencourt-Mangin
|
Felix Driencourt-Mangin, German Rodrigo, German F. R. Sborlini,
William J. Torres Bobadilla
|
Universal four-dimensional representation of $H \to \gamma \gamma$ at
two loops through the Loop-Tree Duality
|
32 pages, 5 figures
| null |
10.1007/JHEP02(2019)143
|
IFIC/18-31, TIF-UNIMI-2018-6
|
hep-ph hep-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We extend useful properties of the $H\to\gamma\gamma$ unintegrated dual
amplitudes from one- to two-loop level, using the Loop-Tree Duality formalism.
In particular, we show that the universality of the functional form --
regardless of the nature of the internal particle -- still holds at this order.
We also present an algorithmic way to renormalise two-loop amplitudes, by
locally cancelling the ultraviolet singularities at integrand level, thus
allowing a full four-dimensional numerical implementation of the method. Our
results are compared with analytic expressions already available in the
literature, finding a perfect numerical agreement. The success of this
computation plays a crucial role for the development of a fully local
four-dimensional framework to compute physical observables at Next-to-Next-to
Leading order and beyond.
|
[
{
"created": "Mon, 28 Jan 2019 17:47:03 GMT",
"version": "v1"
}
] |
2019-03-27
|
[
[
"Driencourt-Mangin",
"Felix",
""
],
[
"Rodrigo",
"German",
""
],
[
"Sborlini",
"German F. R.",
""
],
[
"Bobadilla",
"William J. Torres",
""
]
] |
We extend useful properties of the $H\to\gamma\gamma$ unintegrated dual amplitudes from one- to two-loop level, using the Loop-Tree Duality formalism. In particular, we show that the universality of the functional form -- regardless of the nature of the internal particle -- still holds at this order. We also present an algorithmic way to renormalise two-loop amplitudes, by locally cancelling the ultraviolet singularities at integrand level, thus allowing a full four-dimensional numerical implementation of the method. Our results are compared with analytic expressions already available in the literature, finding a perfect numerical agreement. The success of this computation plays a crucial role for the development of a fully local four-dimensional framework to compute physical observables at Next-to-Next-to Leading order and beyond.
|
0810.4016
|
Thomas Konstandin
|
Bjorn Garbrecht and Thomas Konstandin
|
Separation of Equilibration Time-Scales in the Gradient Expansion
|
20 pages, 3 figures, published version
|
Phys.Rev.D79:085003,2009
|
10.1103/PhysRevD.79.085003
| null |
hep-ph hep-th nucl-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We study thermalization by applying gradient expansion to the Kadanoff-Baym
equations of the 2PI effective action to two-loop in a theory with Dirac
fermions coupled to scalars. In addition to those chemical potentials which
equilibrate in the on-shell limit, we identify modes which are conserved in
this approximation, but which relax when off-shell effects are taken into
account. This implies that chemical equilibration does not require higher loop
contributions to the effective action and is compatible with the gradient
expansion. We explicitly calculate the damping time-scales of both, on- and
off-shell, chemical equilibration rates. It is shown that off-shell
equilibration is suppressed by the thermal width of the particles in the
plasma, which explains the separation of on- and off-shell chemical
equilibration time-scales.
|
[
{
"created": "Wed, 22 Oct 2008 09:12:21 GMT",
"version": "v1"
},
{
"created": "Tue, 12 May 2009 12:32:12 GMT",
"version": "v2"
}
] |
2010-04-21
|
[
[
"Garbrecht",
"Bjorn",
""
],
[
"Konstandin",
"Thomas",
""
]
] |
We study thermalization by applying gradient expansion to the Kadanoff-Baym equations of the 2PI effective action to two-loop in a theory with Dirac fermions coupled to scalars. In addition to those chemical potentials which equilibrate in the on-shell limit, we identify modes which are conserved in this approximation, but which relax when off-shell effects are taken into account. This implies that chemical equilibration does not require higher loop contributions to the effective action and is compatible with the gradient expansion. We explicitly calculate the damping time-scales of both, on- and off-shell, chemical equilibration rates. It is shown that off-shell equilibration is suppressed by the thermal width of the particles in the plasma, which explains the separation of on- and off-shell chemical equilibration time-scales.
|
hep-ph/9804385
|
Tom Sizer
|
Andreas W. Schreiber, Tom Sizer and Anthony G. Williams (University of
Adelaide, Australia)
|
Dimensionally regularized study of nonperturbative quenched QED
|
REVTEX 3.0, 15 pages,including 3 eps figures; revised version has
minor changes to introduction and conclusion and additional results in
tables. Accepted for publication in Physical Review D
|
Phys.Rev.D58:125014,1998
|
10.1103/PhysRevD.58.125014
|
ADP-98-010/T288
|
hep-ph hep-th
| null |
We study the dimensionally regularized fermion propagator Dyson-Schwinger
equation in quenched nonperturbative QED. We work in arbitrary covariant gauge
and perform nonperturbative renormalization numerically. The nonperturbative
fermion propagator is solved in D = 4 - 2 * epsilon dimensional Euclidean space
for a large number of values of epsilon. Results for D=4 dimensions are then
obtained by extrapolation to epsilon = 0. Here we present results using the
Curtis-Penningon fermion-photon proper vertex for two values of the coupling,
namely alpha=0.6 and alpha=1.5, and compare these to previous studies employing
a modified ultraviolet cut-off regularization. The results using the two
different regularizations are found to agree to within the numerical precision
of the present calculations.
|
[
{
"created": "Fri, 24 Apr 1998 07:06:53 GMT",
"version": "v1"
},
{
"created": "Tue, 15 Sep 1998 10:00:41 GMT",
"version": "v2"
}
] |
2009-08-11
|
[
[
"Schreiber",
"Andreas W.",
"",
"University of\n Adelaide, Australia"
],
[
"Sizer",
"Tom",
"",
"University of\n Adelaide, Australia"
],
[
"Williams",
"Anthony G.",
"",
"University of\n Adelaide, Australia"
]
] |
We study the dimensionally regularized fermion propagator Dyson-Schwinger equation in quenched nonperturbative QED. We work in arbitrary covariant gauge and perform nonperturbative renormalization numerically. The nonperturbative fermion propagator is solved in D = 4 - 2 * epsilon dimensional Euclidean space for a large number of values of epsilon. Results for D=4 dimensions are then obtained by extrapolation to epsilon = 0. Here we present results using the Curtis-Penningon fermion-photon proper vertex for two values of the coupling, namely alpha=0.6 and alpha=1.5, and compare these to previous studies employing a modified ultraviolet cut-off regularization. The results using the two different regularizations are found to agree to within the numerical precision of the present calculations.
|
hep-ph/0410085
|
Christopher Kolda
|
K.S. Babu, Ilia Gogoladze and Christopher Kolda
|
Perturbative Unification and Higgs Boson Mass Bounds
|
15 pages LaTeX, 4 EPS figures. References added
| null | null |
OSU-HEP-04-11
|
hep-ph
| null |
Supersymmetric extensions of the Standard Model generally give a theoretical
upper limit on the lightest Higgs boson mass which may be uncomfortably close
to the current experimental lower bound of $m_h$ > 114 GeV. Here we show ways
in which this upper limit on $m_h$ can be relaxed substantially in the
perturbative regime, while maintaining the successful unification of gauge
couplings as observed in the minimal scenario. A class of models is presented,
which includes new vector-like matter with the quantum numbers of the 5, 5-bar
and singlet representations of SU(5) and having Yukawa couplings (\kappa) to
the usual Higgs doublet $H_u$. This new matter transforms non-trivially under a
"lateral" SU(N) gauge symmetry, which enables the new Yukawa couplings \kappa
to be sizable, even larger than the top-quark Yukawa coupling, and still be
perturbative at all momenta up to the unification scale of 10^{16} GeV. We find
that, consistent with low energy constraints, $m_h$ can be raised to values as
large as 200 - 300 GeV.
|
[
{
"created": "Wed, 6 Oct 2004 15:18:37 GMT",
"version": "v1"
},
{
"created": "Thu, 4 Nov 2004 15:12:58 GMT",
"version": "v2"
}
] |
2007-05-23
|
[
[
"Babu",
"K. S.",
""
],
[
"Gogoladze",
"Ilia",
""
],
[
"Kolda",
"Christopher",
""
]
] |
Supersymmetric extensions of the Standard Model generally give a theoretical upper limit on the lightest Higgs boson mass which may be uncomfortably close to the current experimental lower bound of $m_h$ > 114 GeV. Here we show ways in which this upper limit on $m_h$ can be relaxed substantially in the perturbative regime, while maintaining the successful unification of gauge couplings as observed in the minimal scenario. A class of models is presented, which includes new vector-like matter with the quantum numbers of the 5, 5-bar and singlet representations of SU(5) and having Yukawa couplings (\kappa) to the usual Higgs doublet $H_u$. This new matter transforms non-trivially under a "lateral" SU(N) gauge symmetry, which enables the new Yukawa couplings \kappa to be sizable, even larger than the top-quark Yukawa coupling, and still be perturbative at all momenta up to the unification scale of 10^{16} GeV. We find that, consistent with low energy constraints, $m_h$ can be raised to values as large as 200 - 300 GeV.
|
1306.6474
|
Wouter Hulsbergen
|
Wouter Hulsbergen
|
Constraining new physics in B_s meson mixing
|
25 pages, 7 figures; v2: added references; v3: updated references and
LHCb a_sl; v4: fixed Ks-Kl oscillation period
|
Mod. Phys. Lett. A, 28, 1330023 (2013)
|
10.1142/S0217732313300231
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Neutral mesons exhibit a phenomenon called flavour mixing. As a consequence
of a second order weak process the flavour eigenstates corresponding to the
meson and its anti-meson are superpositions of two mass eigenstates. A meson
produced in a flavour state changes into an anti-meson and back again as a
function of time. Such flavour oscillations are considered sensitive probes of
physics beyond the Standard Model. In this brief review I summarize the status
of experimental constraints on mixing parameters in the B_s meson system.
|
[
{
"created": "Thu, 27 Jun 2013 12:08:12 GMT",
"version": "v1"
},
{
"created": "Fri, 5 Jul 2013 06:35:51 GMT",
"version": "v2"
},
{
"created": "Mon, 19 Aug 2013 11:25:39 GMT",
"version": "v3"
},
{
"created": "Fri, 30 Aug 2013 20:48:54 GMT",
"version": "v4"
}
] |
2013-09-03
|
[
[
"Hulsbergen",
"Wouter",
""
]
] |
Neutral mesons exhibit a phenomenon called flavour mixing. As a consequence of a second order weak process the flavour eigenstates corresponding to the meson and its anti-meson are superpositions of two mass eigenstates. A meson produced in a flavour state changes into an anti-meson and back again as a function of time. Such flavour oscillations are considered sensitive probes of physics beyond the Standard Model. In this brief review I summarize the status of experimental constraints on mixing parameters in the B_s meson system.
|
hep-ph/0101081
|
Feng Tai-fu
|
Tai-Fu Feng, Xue-Qian Li, Guo-Li Wang
|
|Delta B|=1 Weak Effective Lagrangian in the Minimal Flavor Violation
Supersymmetry
|
Latex,16 pages plus 5 figures, PRD version
|
Phys.Rev. D64 (2001) 075014
|
10.1103/PhysRevD.64.075014
| null |
hep-ph
| null |
To evaluate the weak decays of b-hadrons, the $\Delta B=1$ weak effective
Lagrangian is the foundation. Any new physics beyond the standard model (SM)
would contribute to the effective Lagrangian through the loop integration at
the weak scale and evolution from the weak scale down to the hadronic scale. In
this work we present a systematic analysis on the effective Lagrangian which
mediates hadronic $|\Delta B|=1$ processes in the framework of the minimal
flavor violation supersymmetry as well as a numerical evaluation of the Wilson
coefficients in the effective theory.
|
[
{
"created": "Tue, 9 Jan 2001 15:13:00 GMT",
"version": "v1"
},
{
"created": "Thu, 28 Jun 2001 11:14:59 GMT",
"version": "v2"
}
] |
2009-11-07
|
[
[
"Feng",
"Tai-Fu",
""
],
[
"Li",
"Xue-Qian",
""
],
[
"Wang",
"Guo-Li",
""
]
] |
To evaluate the weak decays of b-hadrons, the $\Delta B=1$ weak effective Lagrangian is the foundation. Any new physics beyond the standard model (SM) would contribute to the effective Lagrangian through the loop integration at the weak scale and evolution from the weak scale down to the hadronic scale. In this work we present a systematic analysis on the effective Lagrangian which mediates hadronic $|\Delta B|=1$ processes in the framework of the minimal flavor violation supersymmetry as well as a numerical evaluation of the Wilson coefficients in the effective theory.
|
hep-ph/0206103
|
Zhi-Qiang Shi
|
Guang-jiong Ni
|
A New Interpretation on Quantum Mechanics
|
8 pages, revtex4
| null | null | null |
hep-ph
| null |
Based on new experiments about the "macroscopic Schrodinger's cat state"
etc., a self-consistent interpretation on quantum mechanics is presented from
the new point of view combining physics, philosophy and mathematics together.
|
[
{
"created": "Wed, 12 Jun 2002 07:58:31 GMT",
"version": "v1"
},
{
"created": "Wed, 31 Jul 2002 14:20:47 GMT",
"version": "v2"
}
] |
2007-05-23
|
[
[
"Ni",
"Guang-jiong",
""
]
] |
Based on new experiments about the "macroscopic Schrodinger's cat state" etc., a self-consistent interpretation on quantum mechanics is presented from the new point of view combining physics, philosophy and mathematics together.
|
0712.4072
|
Sandhya Choubey
|
Sanjib Kumar Agarwalla, Sandhya Choubey, Amitava Raychaudhuri
|
Physics with Beta-Beam
|
Talk at the 9th International Workshop on Neutrino Factories,
SuperBeams and BetaBeams (NuFact07), Okayama University, Okayama, Japan,
August 6-11, 2007
|
AIPConf.Proc.981:84-88,2008
|
10.1063/1.2899008
| null |
hep-ph hep-ex
| null |
A Beta-beam would be a high intensity source of pure $\nu_e$ and/or
$\bar\nu_e$ flux with known spectrum, ideal for precision measurements. Myriad
of possible set-ups with suitable choices of baselines, detectors and the
beta-beam neutrino source with desired energies have been put forth in the
literature. In this talk we present a comparitive discussion of the physics
reach of a few such experimental set-ups.
|
[
{
"created": "Tue, 25 Dec 2007 14:30:33 GMT",
"version": "v1"
}
] |
2008-11-26
|
[
[
"Agarwalla",
"Sanjib Kumar",
""
],
[
"Choubey",
"Sandhya",
""
],
[
"Raychaudhuri",
"Amitava",
""
]
] |
A Beta-beam would be a high intensity source of pure $\nu_e$ and/or $\bar\nu_e$ flux with known spectrum, ideal for precision measurements. Myriad of possible set-ups with suitable choices of baselines, detectors and the beta-beam neutrino source with desired energies have been put forth in the literature. In this talk we present a comparitive discussion of the physics reach of a few such experimental set-ups.
|
2207.07718
|
Nasrallah Nasrallah
|
Nasrallah F. Nasrallah, Karl Schilcher
|
Isovector Meson Masses from QCD Sum Rules
|
Typos and misprints corrected
| null |
10.1142/S0217732323500098
| null |
hep-ph
|
http://creativecommons.org/licenses/by/4.0/
|
We present a calculation of the masses of the isovector mesons ( vector,
scalar and pseudoscalar including the established recurrences) using a new
method of finite energy QCD sum rules. The method is based on the idea of
choosing a suitable integration kernel which minimizes the occurring integral
over the cut in the complex energy (squared) plane. We obtain remarkably stable
results in a wide range R, where R is the radius of the integration contour.
The sum rule predictions agree with the experimental values within the expected
accuracy showing that QCD describes single resonances.
|
[
{
"created": "Fri, 15 Jul 2022 19:21:27 GMT",
"version": "v1"
},
{
"created": "Thu, 18 Aug 2022 14:51:54 GMT",
"version": "v2"
},
{
"created": "Sat, 5 Nov 2022 15:40:13 GMT",
"version": "v3"
}
] |
2023-05-17
|
[
[
"Nasrallah",
"Nasrallah F.",
""
],
[
"Schilcher",
"Karl",
""
]
] |
We present a calculation of the masses of the isovector mesons ( vector, scalar and pseudoscalar including the established recurrences) using a new method of finite energy QCD sum rules. The method is based on the idea of choosing a suitable integration kernel which minimizes the occurring integral over the cut in the complex energy (squared) plane. We obtain remarkably stable results in a wide range R, where R is the radius of the integration contour. The sum rule predictions agree with the experimental values within the expected accuracy showing that QCD describes single resonances.
|
1910.02972
|
Alexandria Costantino
|
Alexandria Costantino, Sylvain Fichet, Philip Tanedo
|
Exotic Spin-Dependent Forces from a Hidden Sector
|
19 pages & appendices, 4 figures, 1 table. v2: Paragraph added for
clarity, reference added, matches JHEP version
|
Journal of High Energy Physics volume 2020, Article number: 148
|
10.1007/JHEP03(2020)148
|
UCR-TR-2019-FLIP-NCC-1709
|
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
New dynamics from hidden sectors may manifest as long-range forces between
visible matter particles. The well-known case of Yukawa-like potentials occurs
via the exchange of a single virtual particle. However, more exotic behavior is
also possible. We present three classes of exotic potentials that are generated
by relativistic theories: (i) quantum forces from the loop-level exchange of
two virtual particles, (ii) conformal forces from a conformal sector, and (iii)
emergent forces from degrees of freedom that only exist in the infrared regime
of the theory. We discuss the complementarity of spin-dependent force searches
in an effective field theory framework. We identify well-motivated directions
to search for exotic spin-dependent forces.
|
[
{
"created": "Mon, 7 Oct 2019 18:01:05 GMT",
"version": "v1"
},
{
"created": "Thu, 26 Mar 2020 23:13:58 GMT",
"version": "v2"
}
] |
2020-03-30
|
[
[
"Costantino",
"Alexandria",
""
],
[
"Fichet",
"Sylvain",
""
],
[
"Tanedo",
"Philip",
""
]
] |
New dynamics from hidden sectors may manifest as long-range forces between visible matter particles. The well-known case of Yukawa-like potentials occurs via the exchange of a single virtual particle. However, more exotic behavior is also possible. We present three classes of exotic potentials that are generated by relativistic theories: (i) quantum forces from the loop-level exchange of two virtual particles, (ii) conformal forces from a conformal sector, and (iii) emergent forces from degrees of freedom that only exist in the infrared regime of the theory. We discuss the complementarity of spin-dependent force searches in an effective field theory framework. We identify well-motivated directions to search for exotic spin-dependent forces.
|
hep-ph/9712357
|
Z. Hioki
|
B. Grzadkowski, Z. Hioki and M. Szafranski
|
Four-Fermi Effective Operators in Top-Quark Production and Decay
|
Polarized e^- plus unpolarized e^+ collisions were included
|
Phys. Rev. D 58, 035002 (1998)
|
10.1103/PhysRevD.58.035002
|
IFT-16-97 -- TOKUSHIMA 97-02
|
hep-ph hep-ex
| null |
Effects of four-Fermi-type new interactions are studied in top-quark pair
production and their subsequent decays at future e^+e^- colliders.
Secondary-lepton-energy distributions are calculated for arbitrary longitudinal
beam polarizations. An optimal-observables procedure is applied for the
determination of new parameters.
|
[
{
"created": "Fri, 12 Dec 1997 01:09:41 GMT",
"version": "v1"
},
{
"created": "Mon, 23 Mar 1998 00:00:29 GMT",
"version": "v2"
}
] |
2016-08-25
|
[
[
"Grzadkowski",
"B.",
""
],
[
"Hioki",
"Z.",
""
],
[
"Szafranski",
"M.",
""
]
] |
Effects of four-Fermi-type new interactions are studied in top-quark pair production and their subsequent decays at future e^+e^- colliders. Secondary-lepton-energy distributions are calculated for arbitrary longitudinal beam polarizations. An optimal-observables procedure is applied for the determination of new parameters.
|
hep-ph/0209039
|
Dumitru Ion
|
D.B. Ion, E.K. Sarkisyan
|
Dual coherent particle emission as generalised Cherenkov-like effect in
high energy particle collisions
|
5 pages, 5 eps figs., revtex4 style
| null | null | null |
hep-ph
| null |
In this paper we introduce a new kind of nuclear/hadronic coherent particle
production mechanism in high-energy collisions called \emph{dual coherent
particle emission (DCPE)} which takes place when the phase velocities of the
emitted particle v_{Mph} and that of particle source v_{B_1ph} satisfy the dual
coherence condition: v_{Mph} <= v_{B_1ph}^-1. The general signatures of the
DCPE in the nuclear and hadronic media are established and some experimental
evidences are given.
|
[
{
"created": "Wed, 4 Sep 2002 13:47:22 GMT",
"version": "v1"
}
] |
2007-05-23
|
[
[
"Ion",
"D. B.",
""
],
[
"Sarkisyan",
"E. K.",
""
]
] |
In this paper we introduce a new kind of nuclear/hadronic coherent particle production mechanism in high-energy collisions called \emph{dual coherent particle emission (DCPE)} which takes place when the phase velocities of the emitted particle v_{Mph} and that of particle source v_{B_1ph} satisfy the dual coherence condition: v_{Mph} <= v_{B_1ph}^-1. The general signatures of the DCPE in the nuclear and hadronic media are established and some experimental evidences are given.
|
1510.03894
|
Wieslaw Sobk\'ow
|
W. Sobk\'ow (1), A. B{\l}aut (1) ((1) Institute of Theoretical
Physics, University of Wroc{\l}aw, Poland)
|
Azimuthal asymmetry of recoil electrons in neutrino-electron elastic
scattering as signature of neutrino nature
|
11 pages, 1 figure
|
Eur. Phys. J. C 76, 257 (2016)
|
10.1140/epjc/s10052-016-4077-x
| null |
hep-ph hep-ex
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
In this paper, we show how a presence of the exotic scalar, tensor weak
interactions in addition to the standard vector-axial (V-A) one may help to
distinguish the Dirac from Majorana neutrinos in the elastic scattering of
(anti)neutrino beam off the unpolarized electrons in the limit of vanishing
(anti)neutrino mass. We assume that the incoming (anti)neutrino beam comes from
the polarized muon decay at rest and is the left-right chiral mixture with
assigned direction of the transversal spin polarization with respect to the
production plane. We display that the azimuthal asymmetry in the angular
distribution of recoil electrons is generated by the interference terms between
the standard and exotic couplings, which are proportional to the transversal
(anti)neutrino spin polarization and independent of the neutrino mass. This
asymmetry for the Majorana neutrinos is distinct from the one for the Dirac
neutrinos through the absence of interference between the standard and tensor
couplings. Additionally, the interference term between the standard and scalar
coupling of the only left chiral neutrinos, absent in the Dirac case, appears.
We also indicate the possibility of utilizing the azimuthal asymmetry
measurements to search for the new CP-violating phases. Our analysis is
model-independent and consistent with the current upper limits on the
non-standard couplings.
|
[
{
"created": "Tue, 13 Oct 2015 21:02:17 GMT",
"version": "v1"
}
] |
2016-05-30
|
[
[
"Sobków",
"W.",
""
],
[
"Błaut",
"A.",
""
]
] |
In this paper, we show how a presence of the exotic scalar, tensor weak interactions in addition to the standard vector-axial (V-A) one may help to distinguish the Dirac from Majorana neutrinos in the elastic scattering of (anti)neutrino beam off the unpolarized electrons in the limit of vanishing (anti)neutrino mass. We assume that the incoming (anti)neutrino beam comes from the polarized muon decay at rest and is the left-right chiral mixture with assigned direction of the transversal spin polarization with respect to the production plane. We display that the azimuthal asymmetry in the angular distribution of recoil electrons is generated by the interference terms between the standard and exotic couplings, which are proportional to the transversal (anti)neutrino spin polarization and independent of the neutrino mass. This asymmetry for the Majorana neutrinos is distinct from the one for the Dirac neutrinos through the absence of interference between the standard and tensor couplings. Additionally, the interference term between the standard and scalar coupling of the only left chiral neutrinos, absent in the Dirac case, appears. We also indicate the possibility of utilizing the azimuthal asymmetry measurements to search for the new CP-violating phases. Our analysis is model-independent and consistent with the current upper limits on the non-standard couplings.
|
1512.01942
|
Siamak Sadat Gousheh
|
S. Rostam Zadeh, S. S. Gousheh
|
On the Contributions to the $\bf U_Y(1)$ Chern-Simons Term and the
Evolution of Fermionic Asymmetries and Hypermagnetic Fields
|
29 pages, 4 figures
|
Phys. Rev. D 94, 056013 (2016)
|
10.1103/PhysRevD.94.056013
| null |
hep-ph hep-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We study simultaneous evolution of electron, neutrino and quark asymmetries,
and large scale hypermagnetic fields in the symmetric phase of the electroweak
plasma in the temperature range $100$GeV$\leq T\leq 10$TeV, taking into account
the chirality flip processes via inverse Higgs decays and fermion number
violation due to Abelian anomalies. We present a derivation of the coefficient
of the Chern-Simons term for the hypercharge gauge field, showing that the
left-handed and right-handed components of each fermion species contribute with
opposite sign. This is in contrast to the results presented in some of the
previous works. The $\textrm{U}_{\textrm{Y}}(1)$ Chern-Simons term affects the
resulting anomalous magnetohydrodynamic (AMHD) equations. We solve the
resulting coupled evolution equations for the lepton and baryon asymmetries, as
well as the hypermagnetic field to obtain their time evolution along with their
values at the electroweak phase transition ($T_{EW} \sim 100$GeV) for a variety
of critical ranges for their initial values at $T=10$TeV. We first investigate
the results of this sign change, by directly comparing our results with those
obtained in one of the previous works and find that matter asymmetry generation
increases considerably in the presence of a strong hypermagnetic field.
Furthermore, we find that a strong hypermagnetic field can generate matter
asymmetry starting from absolutely zero asymmetry, while matter asymmetry can
generate a hypermagnetic field provided the initial value of the latter is
nonzero.
|
[
{
"created": "Mon, 7 Dec 2015 08:28:12 GMT",
"version": "v1"
},
{
"created": "Thu, 3 Mar 2016 09:58:11 GMT",
"version": "v2"
},
{
"created": "Tue, 7 Jun 2016 08:53:47 GMT",
"version": "v3"
},
{
"created": "Tue, 28 Jun 2016 19:57:04 GMT",
"version": "v4"
},
{
"created": "Thu, 8 Sep 2016 12:27:39 GMT",
"version": "v5"
}
] |
2016-10-05
|
[
[
"Zadeh",
"S. Rostam",
""
],
[
"Gousheh",
"S. S.",
""
]
] |
We study simultaneous evolution of electron, neutrino and quark asymmetries, and large scale hypermagnetic fields in the symmetric phase of the electroweak plasma in the temperature range $100$GeV$\leq T\leq 10$TeV, taking into account the chirality flip processes via inverse Higgs decays and fermion number violation due to Abelian anomalies. We present a derivation of the coefficient of the Chern-Simons term for the hypercharge gauge field, showing that the left-handed and right-handed components of each fermion species contribute with opposite sign. This is in contrast to the results presented in some of the previous works. The $\textrm{U}_{\textrm{Y}}(1)$ Chern-Simons term affects the resulting anomalous magnetohydrodynamic (AMHD) equations. We solve the resulting coupled evolution equations for the lepton and baryon asymmetries, as well as the hypermagnetic field to obtain their time evolution along with their values at the electroweak phase transition ($T_{EW} \sim 100$GeV) for a variety of critical ranges for their initial values at $T=10$TeV. We first investigate the results of this sign change, by directly comparing our results with those obtained in one of the previous works and find that matter asymmetry generation increases considerably in the presence of a strong hypermagnetic field. Furthermore, we find that a strong hypermagnetic field can generate matter asymmetry starting from absolutely zero asymmetry, while matter asymmetry can generate a hypermagnetic field provided the initial value of the latter is nonzero.
|
1705.05975
|
Takashi Kaneko
|
Takashi Kaneko, Xiao-Rui Lyu, Arantza Oyanguren
|
$|V_{ud}|$, $|V_{us}|$, $|V_{cd}|$, $|V_{cs}|$ and charm (semi)leptonic
decays: WG1 summary from CKM 2016
|
12 pages, 7 figures, WG1 summary for the 9th International Workshop
on the CKM Unitarity Triangle (CKM 2016), 28 November - 2 December 2016, Tata
Institute of Fundamental Research, India
|
PoS (CKM2016) 014
| null | null |
hep-ph hep-ex hep-lat
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We summarize the current status of the determination of the CKM matrix
elements |V_ud| and |V_us|, which is at the precision frontier of CKM
phenomenology. We also review recent progress on the study of charm
(semi)leptonic decays, and the determination of |V_cd| and |V_cs|.
|
[
{
"created": "Wed, 17 May 2017 01:48:23 GMT",
"version": "v1"
}
] |
2017-05-18
|
[
[
"Kaneko",
"Takashi",
""
],
[
"Lyu",
"Xiao-Rui",
""
],
[
"Oyanguren",
"Arantza",
""
]
] |
We summarize the current status of the determination of the CKM matrix elements |V_ud| and |V_us|, which is at the precision frontier of CKM phenomenology. We also review recent progress on the study of charm (semi)leptonic decays, and the determination of |V_cd| and |V_cs|.
|
0810.1610
|
T. Lappi
|
F. Gelis, T. Lappi, R. Venugopalan
|
The glasma initial state and JIMWLK factorization
|
4 pages, 2 figures. Talk given by T.L. at Strong and Electroweak
Matter 2008 (SEWM08), August 26-29, 2008, Amsterdam, The Netherlands
|
Nucl.Phys.A820:111c-114c,2009
|
10.1016/j.nuclphysa.2009.01.028
|
IPhT-T08/149
|
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We review recent work on understanding the next to leading order corrections
to the classical fields that dominate the initial stages of a heavy ion
collision. We have recently shown that the leading ln(1/x) divergences of these
corrections to gluon multiplicities can be factorized into the JIMWLK evolution
of the color charge density distributions.
|
[
{
"created": "Thu, 9 Oct 2008 10:01:36 GMT",
"version": "v1"
}
] |
2009-03-24
|
[
[
"Gelis",
"F.",
""
],
[
"Lappi",
"T.",
""
],
[
"Venugopalan",
"R.",
""
]
] |
We review recent work on understanding the next to leading order corrections to the classical fields that dominate the initial stages of a heavy ion collision. We have recently shown that the leading ln(1/x) divergences of these corrections to gluon multiplicities can be factorized into the JIMWLK evolution of the color charge density distributions.
|
1507.00269
|
Pedro David Ruiz-Femenia
|
Pedro Ruiz-Femenia, Mehran Zahiri-Abyaneh
|
On the minimality of the order p^6 chiral Lagrangian
|
14 pages, 2 figures
| null |
10.1016/j.physletb.2015.10.042
|
IFIC/15-27, TUM-HEP-998/15
|
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
A method to find relations between the operators in the mesonic Lagrangian of
Chiral Perturbation Theory at order p^6 is presented. The procedure can be used
to establish if the basis of operators in the Lagrangian is minimal. As an
example, we apply the method to the two-flavour case in the absence of scalar
and pseudo-scalar sources (s=p=0), and conclude that the minimal Lagrangian
contains 27 independent operators.
|
[
{
"created": "Wed, 1 Jul 2015 15:57:15 GMT",
"version": "v1"
}
] |
2015-10-21
|
[
[
"Ruiz-Femenia",
"Pedro",
""
],
[
"Zahiri-Abyaneh",
"Mehran",
""
]
] |
A method to find relations between the operators in the mesonic Lagrangian of Chiral Perturbation Theory at order p^6 is presented. The procedure can be used to establish if the basis of operators in the Lagrangian is minimal. As an example, we apply the method to the two-flavour case in the absence of scalar and pseudo-scalar sources (s=p=0), and conclude that the minimal Lagrangian contains 27 independent operators.
|
hep-ph/9703303
| null |
Mauro Anselmino (1), Alessandro Drago (2), Francesco Murgia (3) ((1)
University and INFN, Torino, Italy (2) University and INFN, Ferrara, Italy
(3) INFN, Cagliari, Italy)
|
Single-Spin Asymmetries in $p^\uparrow p \to \pi X$ and Chiral Symmetry
|
REVTEX, 7 pages, no figures
| null | null |
INFNCA-TH9703, DFTT 18/97
|
hep-ph
| null |
We study a possible origin of single spin asymmetries in the large $p_T$
inclusive production of hadrons in the scattering of unpolarized protons or
leptons on transversely polarized nucleons. Such asymmetry is related to the
single-spin asymmetry for the process $\p^\uparrow \to q+X$ or, equivalently,
to the off-diagonal matrix element of the quark density operator $\bar \psi
\gamma^+ \psi$; this quantity need not be zero if transverse momentum and
spin-isospin interactions are taken into account. The different signs for the
large single spin asymmetries observed in $\p^\uparrow p \to \pi^+ X$ and
$\p^\uparrow p \to \pi^- X$ can be explained as a consequence of chiral
symmetry. Crucial tests of the model are suggested.
|
[
{
"created": "Wed, 12 Mar 1997 10:57:19 GMT",
"version": "v1"
}
] |
2007-05-23
|
[
[
"Anselmino",
"Mauro",
""
],
[
"Drago",
"Alessandro",
""
],
[
"Murgia",
"Francesco",
""
]
] |
We study a possible origin of single spin asymmetries in the large $p_T$ inclusive production of hadrons in the scattering of unpolarized protons or leptons on transversely polarized nucleons. Such asymmetry is related to the single-spin asymmetry for the process $\p^\uparrow \to q+X$ or, equivalently, to the off-diagonal matrix element of the quark density operator $\bar \psi \gamma^+ \psi$; this quantity need not be zero if transverse momentum and spin-isospin interactions are taken into account. The different signs for the large single spin asymmetries observed in $\p^\uparrow p \to \pi^+ X$ and $\p^\uparrow p \to \pi^- X$ can be explained as a consequence of chiral symmetry. Crucial tests of the model are suggested.
|
hep-ph/0204092
|
Pran Nath
|
Tarek Ibrahim and Pran Nath
|
Neutralino Exchange Corrections to the Higgs Boson Mixings with Explicit
CP Violation
|
23 pages,Latex, and seven figures
|
Phys.Rev.D66:015005,2002
|
10.1103/PhysRevD.66.015005
| null |
hep-ph
| null |
A calculus for the derivatives of the eigen values of the neutralino mass
matrix with respect to the CP violating background fields is developed and used
to compute the mixings among the CP even and the CP odd Higgs sectors arising
from the inclusion of the neutralino sector consisting of the neutralino, the Z
boson, and the neutral Higgs bosons ($\chi^0_i-Z-h^0-H^0$) exchange in the loop
contribution to the effective potential including the effects of large CP
violating phases. Along with the stop, sbottom, stau and chargino-W-charged
Higgs ($\chi^+-W-H^+$) contributions computed previously the present analysis
completes the one loop corrections to the Higgs boson mass matrix in the
presence of large phases. CP violation in the neutral Higgs sector is discussed
in the above framework with specific focus on the mixings of the CP even and
the CP odd sectors arising from the neutralino sector. It is shown that
numerically the effects of the neutralino exchange contribution on the mixings
of the CP even and the CP odd sectors are comparable to the effects of the stop
and of the chargino exchange contributions and thus the neutralino exchange
contribution must be included for a realistic analysis of mixings in the CP
even and the CP odd sectors. Phenomenological implications of these results are
discussed.
|
[
{
"created": "Mon, 8 Apr 2002 21:54:17 GMT",
"version": "v1"
}
] |
2008-11-26
|
[
[
"Ibrahim",
"Tarek",
""
],
[
"Nath",
"Pran",
""
]
] |
A calculus for the derivatives of the eigen values of the neutralino mass matrix with respect to the CP violating background fields is developed and used to compute the mixings among the CP even and the CP odd Higgs sectors arising from the inclusion of the neutralino sector consisting of the neutralino, the Z boson, and the neutral Higgs bosons ($\chi^0_i-Z-h^0-H^0$) exchange in the loop contribution to the effective potential including the effects of large CP violating phases. Along with the stop, sbottom, stau and chargino-W-charged Higgs ($\chi^+-W-H^+$) contributions computed previously the present analysis completes the one loop corrections to the Higgs boson mass matrix in the presence of large phases. CP violation in the neutral Higgs sector is discussed in the above framework with specific focus on the mixings of the CP even and the CP odd sectors arising from the neutralino sector. It is shown that numerically the effects of the neutralino exchange contribution on the mixings of the CP even and the CP odd sectors are comparable to the effects of the stop and of the chargino exchange contributions and thus the neutralino exchange contribution must be included for a realistic analysis of mixings in the CP even and the CP odd sectors. Phenomenological implications of these results are discussed.
|
hep-ph/9604280
|
Daisuke Jido
|
D. Jido, N. Kodama and M. Oka
|
Negative-parity Nucleon Resonance in the QCD Sum Rule
|
10 page, LaTeX, 4 EPS figures, uses epsf.sty
|
Phys.Rev. D54 (1996) 4532-4536
|
10.1103/PhysRevD.54.4532
|
TIT/HEP-328/NP
|
hep-ph nucl-th
| null |
The negative-parity baryons are studied by a novel approach in the QCD sum
rule. It is found that the parity of the ground-state nucleon is determined by
the sign of the quark condensate. We predict the mass of negative-parity
nucleon.
|
[
{
"created": "Wed, 10 Apr 1996 09:02:39 GMT",
"version": "v1"
}
] |
2009-10-28
|
[
[
"Jido",
"D.",
""
],
[
"Kodama",
"N.",
""
],
[
"Oka",
"M.",
""
]
] |
The negative-parity baryons are studied by a novel approach in the QCD sum rule. It is found that the parity of the ground-state nucleon is determined by the sign of the quark condensate. We predict the mass of negative-parity nucleon.
|
2405.03494
|
Maximilian Stadelmaier
|
Maximilian Stadelmaier, Ralph Engel, Markus Roth, David Schmidt, Darko
Veberic
|
A Model of the Response of Surface Detectors to Extensive Air Showers
Based on Shower Universality
|
15 pages, 10 figures, prepared for submission to Phys.Rev.D
|
Phys. Rev. D 110 (2024) 023030
|
10.1103/PhysRevD.110.023030
| null |
hep-ph astro-ph.HE astro-ph.IM hep-ex
|
http://creativecommons.org/licenses/by/4.0/
|
We present a full model of surface-detector responses to extensive air
showers. The model is motivated by the principles of air-shower universality
and can be applied to different types of surface detectors. Here we describe a
parametrization for both water-Cerenkov detectors and scintillator surface
detectors, as for instance employed by the upgraded detector array of the
Pierre Auger Observatory. Using surface detector data, the model can be used to
reconstruct with reasonable precision shower observables such as the depth of
the shower maximum $X_\text{max}$ and the number of muons $R_\mu$.
|
[
{
"created": "Mon, 6 May 2024 14:04:03 GMT",
"version": "v1"
},
{
"created": "Tue, 23 Jul 2024 08:15:34 GMT",
"version": "v2"
}
] |
2024-07-24
|
[
[
"Stadelmaier",
"Maximilian",
""
],
[
"Engel",
"Ralph",
""
],
[
"Roth",
"Markus",
""
],
[
"Schmidt",
"David",
""
],
[
"Veberic",
"Darko",
""
]
] |
We present a full model of surface-detector responses to extensive air showers. The model is motivated by the principles of air-shower universality and can be applied to different types of surface detectors. Here we describe a parametrization for both water-Cerenkov detectors and scintillator surface detectors, as for instance employed by the upgraded detector array of the Pierre Auger Observatory. Using surface detector data, the model can be used to reconstruct with reasonable precision shower observables such as the depth of the shower maximum $X_\text{max}$ and the number of muons $R_\mu$.
|
0804.3805
|
Ivan Vitev
|
Ivan Vitev, Ben-Wei Zhang
|
A systematic study of direct photon production in heavy ion collisions
|
Final version published in PLB. Added comments, 2 references and
discussion in relation to SDIS observables
|
Phys.Lett.B669:337-344,2008
|
10.1016/j.physletb.2008.10.019
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
A theoretical derivation of photon bremsstrahlung, induced by the
interactions of an energetic quark in a hot and dense quark-gluon plasma, is
given in the framework of the reaction operator approach. For the physically
relevant case of hard jet production, followed by few in-medium interactions,
we find that the Landau-Pomeranchuk-Migdal suppression of the bremsstrahlung
photon intensity is much stronger than in the previously discussed limit of
on-shell quarks and a large number of soft scatterings. We present the first
systematic study of direct photon production in minimum bias d+Cu and d+Au and
central Cu+Cu and Au+Au heavy ion collisions at the Relativistic Heavy Ion
Collider at center of mass energies of 62.4 GeV and 200 GeV. We find that the
contribution of the final-state photon production at pT < 5 GeV is limited to
35%, and at high transverse momenta, the modification of the direct photon
cross section is dominated by initial-state cold nuclear matter effects.
|
[
{
"created": "Wed, 23 Apr 2008 20:32:32 GMT",
"version": "v1"
},
{
"created": "Wed, 30 Apr 2008 23:33:47 GMT",
"version": "v2"
},
{
"created": "Mon, 10 Nov 2008 18:07:58 GMT",
"version": "v3"
}
] |
2008-11-26
|
[
[
"Vitev",
"Ivan",
""
],
[
"Zhang",
"Ben-Wei",
""
]
] |
A theoretical derivation of photon bremsstrahlung, induced by the interactions of an energetic quark in a hot and dense quark-gluon plasma, is given in the framework of the reaction operator approach. For the physically relevant case of hard jet production, followed by few in-medium interactions, we find that the Landau-Pomeranchuk-Migdal suppression of the bremsstrahlung photon intensity is much stronger than in the previously discussed limit of on-shell quarks and a large number of soft scatterings. We present the first systematic study of direct photon production in minimum bias d+Cu and d+Au and central Cu+Cu and Au+Au heavy ion collisions at the Relativistic Heavy Ion Collider at center of mass energies of 62.4 GeV and 200 GeV. We find that the contribution of the final-state photon production at pT < 5 GeV is limited to 35%, and at high transverse momenta, the modification of the direct photon cross section is dominated by initial-state cold nuclear matter effects.
|
2405.18349
|
Andreas Ekstedt
|
Andreas Ekstedt, Philipp Schicho, and Tuomas V. I. Tenkanen
|
Cosmological phase transitions at three loops: the final verdict on
perturbation theory
|
20 pages; 6 figures; 4 tables
| null | null |
HIP-2024-15/TH
|
hep-ph astro-ph.CO hep-th
|
http://creativecommons.org/licenses/by/4.0/
|
We complete the perturbative program for equilibrium thermodynamics of
cosmological first-order phase transitions by determining the
finite-temperature effective potential of gauge-Higgs theories at
next-to-next-to-next-to-next-to-leading order (N$^4$LO). The computation of the
three-loop effective potential required to reach this order is extended to
generic models in dimensionally reduced effective theories in a companion
article. Our N$^4$LO result is the last perturbative order before confinement
renders electroweak gauge-Higgs theories non-perturbative at four loops. By
contrasting our analysis with non-perturbative lattice results, we find a
remarkable agreement. As a direct application for predictions of gravitational
waves produced by a first-order transition, our computation provides the final
fully perturbative results for the phase transition strength and speed of
sound.
|
[
{
"created": "Tue, 28 May 2024 16:46:00 GMT",
"version": "v1"
}
] |
2024-05-29
|
[
[
"Ekstedt",
"Andreas",
""
],
[
"Schicho",
"Philipp",
""
],
[
"Tenkanen",
"Tuomas V. I.",
""
]
] |
We complete the perturbative program for equilibrium thermodynamics of cosmological first-order phase transitions by determining the finite-temperature effective potential of gauge-Higgs theories at next-to-next-to-next-to-next-to-leading order (N$^4$LO). The computation of the three-loop effective potential required to reach this order is extended to generic models in dimensionally reduced effective theories in a companion article. Our N$^4$LO result is the last perturbative order before confinement renders electroweak gauge-Higgs theories non-perturbative at four loops. By contrasting our analysis with non-perturbative lattice results, we find a remarkable agreement. As a direct application for predictions of gravitational waves produced by a first-order transition, our computation provides the final fully perturbative results for the phase transition strength and speed of sound.
|
1607.00987
|
Ahmed Ali
|
Ahmed Ali, Ishtiaq Ahmed, M. Jamil Aslam and Abdur Rehman
|
Heavy quark symmetry and weak decays of the $b$-baryons in pentaquarks
with a $c\bar{c}$ component
|
18 pages,7 figures, 12 tables
|
Phys. Rev. D 94, 054001 (2016)
|
10.1103/PhysRevD.94.054001
|
DESY 16-102
|
hep-ph hep-ex
|
http://creativecommons.org/licenses/by/4.0/
|
The discovery of the baryonic states $P_c^+(4380)$ and $P_c^+(4450)$ by the
LHCb collaboration has evoked a lot of theoretical interest. These states have
the minimal quark content $c \bar{c} u u d$. Interpreted as hidden charm
diquark-diquark-antiquark baryons, the assigned spin and angular momentum
quantum numbers are $P_c^+(4380)= \{\bar{c} [cu]_{s=1} [ud]_{s=1};
L_{\mathcal{P}}=0, J^{\rm P}=\frac{3}{2}^- \}$ and $P_c^+(4450)= \{\bar{c}
[cu]_{s=1} [ud]_{s=0}; L_{\mathcal{P}}=1, J^{\rm P}=\frac{5}{2}^+ \}$, where
$s=0,1$ are the spins of the diquarks and $L_{\mathcal{P}}=0,1$ are the orbital
angular momentum quantum numbers of the pentaquarks. We point out that heavy
quark symmetry allows only the higher mass pentaquark state $P_c^+(4450)$
having $[ud]_{s=0}$ to be produced in $\Lambda_b^0$ decays, whereas the lower
mass state $P_c^+(4380)$ having $[ud]_{s=1}$ is disfavored. Pentaquark spectrum
is rich enough to accommodate a $J^P=\frac{3}{2}^-$ state, which has the
correct light diquark spin $\{\bar{c} [cu]_{s=1} [ud]_{s=0}; L_{\mathcal{P}}=0,
J^{\rm P}=\frac{3}{2}^- \}$ to be produced in $\Lambda_b^0$ decays. Assuming
that the orbital mass difference between the charmed pentaquarks is similar to
the corresponding mass difference in the charmed baryons, we estimate the mass
of the lower pentaquark $J^P=3/2^-$ state to be about 4110 MeV and suggest to
reanalyze the LHCb data to search for this third state. We present the
spectroscopy of the $S$- and $P$-wave pentaquark states having a $c\bar{c}$
pair and three light quarks using an effective Hamiltonian approach. Some of
these pentaquarks can be produced in weak decays of the $b$-baryons. Combining
heavy quark symmetry and the $SU(3)_F$ symmetry results in strikingly simple
relations among the decay amplitudes which are presented here.
|
[
{
"created": "Mon, 4 Jul 2016 18:45:45 GMT",
"version": "v1"
}
] |
2016-09-07
|
[
[
"Ali",
"Ahmed",
""
],
[
"Ahmed",
"Ishtiaq",
""
],
[
"Aslam",
"M. Jamil",
""
],
[
"Rehman",
"Abdur",
""
]
] |
The discovery of the baryonic states $P_c^+(4380)$ and $P_c^+(4450)$ by the LHCb collaboration has evoked a lot of theoretical interest. These states have the minimal quark content $c \bar{c} u u d$. Interpreted as hidden charm diquark-diquark-antiquark baryons, the assigned spin and angular momentum quantum numbers are $P_c^+(4380)= \{\bar{c} [cu]_{s=1} [ud]_{s=1}; L_{\mathcal{P}}=0, J^{\rm P}=\frac{3}{2}^- \}$ and $P_c^+(4450)= \{\bar{c} [cu]_{s=1} [ud]_{s=0}; L_{\mathcal{P}}=1, J^{\rm P}=\frac{5}{2}^+ \}$, where $s=0,1$ are the spins of the diquarks and $L_{\mathcal{P}}=0,1$ are the orbital angular momentum quantum numbers of the pentaquarks. We point out that heavy quark symmetry allows only the higher mass pentaquark state $P_c^+(4450)$ having $[ud]_{s=0}$ to be produced in $\Lambda_b^0$ decays, whereas the lower mass state $P_c^+(4380)$ having $[ud]_{s=1}$ is disfavored. Pentaquark spectrum is rich enough to accommodate a $J^P=\frac{3}{2}^-$ state, which has the correct light diquark spin $\{\bar{c} [cu]_{s=1} [ud]_{s=0}; L_{\mathcal{P}}=0, J^{\rm P}=\frac{3}{2}^- \}$ to be produced in $\Lambda_b^0$ decays. Assuming that the orbital mass difference between the charmed pentaquarks is similar to the corresponding mass difference in the charmed baryons, we estimate the mass of the lower pentaquark $J^P=3/2^-$ state to be about 4110 MeV and suggest to reanalyze the LHCb data to search for this third state. We present the spectroscopy of the $S$- and $P$-wave pentaquark states having a $c\bar{c}$ pair and three light quarks using an effective Hamiltonian approach. Some of these pentaquarks can be produced in weak decays of the $b$-baryons. Combining heavy quark symmetry and the $SU(3)_F$ symmetry results in strikingly simple relations among the decay amplitudes which are presented here.
|
2207.05505
|
Xin-Zhen Weng
|
Xin-Zhen Weng and Shi-Lin Zhu
|
Systematics of fully heavy dibaryons
|
19 pages, 1 figure
|
Eur. Phys. J. C 84, 126 (2024)
|
10.1140/epjc/s10052-024-12395-4
| null |
hep-ph hep-ex hep-lat nucl-ex nucl-th
|
http://creativecommons.org/licenses/by/4.0/
|
We systematically study the mass spectra of the fully heavy dibaryons in an
extended chromomagnetic model, which includes both the colorelectric and
chromomagnetic interactions. We find no stable state below the corresponding
baryon-baryon thresholds. Besides the masses, we also estimate the relative
width ratios of the two-body decay channels. We hope our study will be of help
for future experiments.
|
[
{
"created": "Tue, 12 Jul 2022 13:00:32 GMT",
"version": "v1"
},
{
"created": "Wed, 13 Jul 2022 06:30:21 GMT",
"version": "v2"
},
{
"created": "Tue, 6 Feb 2024 17:37:36 GMT",
"version": "v3"
}
] |
2024-02-07
|
[
[
"Weng",
"Xin-Zhen",
""
],
[
"Zhu",
"Shi-Lin",
""
]
] |
We systematically study the mass spectra of the fully heavy dibaryons in an extended chromomagnetic model, which includes both the colorelectric and chromomagnetic interactions. We find no stable state below the corresponding baryon-baryon thresholds. Besides the masses, we also estimate the relative width ratios of the two-body decay channels. We hope our study will be of help for future experiments.
|
hep-ph/0408191
|
Shaouly Bar-Shalom
|
David Atwood, Shaouly Bar-Shalom, Amarjit Soni
|
Seesaw induced electroweak scale, the hierarchy problem and sub-eV
neutrino masses
|
latex, 25 pages, no figures. Version 2 is a shorter version (as
accepted in EPJC), not including the discussion on the heavy seesaw Higgs
model
|
Eur.Phys.J.C45:219-225,2006
|
10.1140/epjc/s2005-02403-x
|
BNL-HET-04/10
|
hep-ph
| null |
We describe a model for the scalar sector where all interactions occur either
at an ultra-high scale L_U ~ 10^{16}-10^{19} GeV or at an intermediate scale
L_I ~ 10^{9}-10^{11} GeV. The interaction of physics on these two scales
results in an SU(2) Higgs condensate at the electroweak (EW) scale, L_{EW},
through a seesaw-like Higgs mechanism, L_{EW} ~ L_I^2/L_U, while the breaking
of the SM SU(2)XU(1) gauge symmetry occurs at the intermediate scale L_I. The
EW scale is, therefore, not fundamental but is naturally generated in terms of
ultra-high energy phenomena and so the hierarchy problem is alleviated. We show
that the class of such ``seesaw Higgs'' models predict the existence of sub-eV
neutrino masses which are generated through a ``two-step'' seesaw mechanism in
terms of the same two ultra-high scales: m_nu ~ L_I^4/L_U^3 ~ L_{EW}^2/L_U. The
neutrinos can be either Dirac or Majorana, depending on the structure of the
scalar potential. We also show that our seesaw Higgs model can be naturally
embedded in theories with tiny extra dimensions of size R ~ 1/L_U ~ 10^{-16}
fm, where the seesaw induced EW scale arises from a violation of a symmetry at
a distant brane; in particular, in the scenario presented there are 7 tiny
extra dimensions.
|
[
{
"created": "Tue, 17 Aug 2004 18:56:24 GMT",
"version": "v1"
},
{
"created": "Mon, 19 Sep 2005 19:26:06 GMT",
"version": "v2"
}
] |
2009-01-07
|
[
[
"Atwood",
"David",
""
],
[
"Bar-Shalom",
"Shaouly",
""
],
[
"Soni",
"Amarjit",
""
]
] |
We describe a model for the scalar sector where all interactions occur either at an ultra-high scale L_U ~ 10^{16}-10^{19} GeV or at an intermediate scale L_I ~ 10^{9}-10^{11} GeV. The interaction of physics on these two scales results in an SU(2) Higgs condensate at the electroweak (EW) scale, L_{EW}, through a seesaw-like Higgs mechanism, L_{EW} ~ L_I^2/L_U, while the breaking of the SM SU(2)XU(1) gauge symmetry occurs at the intermediate scale L_I. The EW scale is, therefore, not fundamental but is naturally generated in terms of ultra-high energy phenomena and so the hierarchy problem is alleviated. We show that the class of such ``seesaw Higgs'' models predict the existence of sub-eV neutrino masses which are generated through a ``two-step'' seesaw mechanism in terms of the same two ultra-high scales: m_nu ~ L_I^4/L_U^3 ~ L_{EW}^2/L_U. The neutrinos can be either Dirac or Majorana, depending on the structure of the scalar potential. We also show that our seesaw Higgs model can be naturally embedded in theories with tiny extra dimensions of size R ~ 1/L_U ~ 10^{-16} fm, where the seesaw induced EW scale arises from a violation of a symmetry at a distant brane; in particular, in the scenario presented there are 7 tiny extra dimensions.
|
hep-ph/0507076
|
Patricia Ball
|
Patricia Ball and Roman Zwicky
|
|V_ub| and Constraints on the Leading-Twist Pion Distribution Amplitude
from B->pi l nu
|
11 pages, 5 figures
|
Phys.Lett.B625:225-233,2005
|
10.1016/j.physletb.2005.08.070
|
IPPP/05/37, TPI-MINN-05/22
|
hep-ph
| null |
Using new experimental data on the leptonic mass spectrum of B->pi l nu, we
simultaneously determine |V_ub| and constrain a_2^pi and a_4^pi, the first two
Gegenbauer moments of the pion's leading-twist distribution amplitude. We find
|V_ub| = (3.2\pm 0.1\pm 0.1\pm 0.3) 10^-3, where the first error is
experimental, the second comes from the shape of the form factor in q^2 and the
third is a 8% uncertainty from the normalisation of the form factor. We also
find a_2^pi(1 GeV)=0.19\pm 0.19 and a_4^pi(1 GeV)\geq -0.07.
|
[
{
"created": "Wed, 6 Jul 2005 19:28:04 GMT",
"version": "v1"
}
] |
2010-01-15
|
[
[
"Ball",
"Patricia",
""
],
[
"Zwicky",
"Roman",
""
]
] |
Using new experimental data on the leptonic mass spectrum of B->pi l nu, we simultaneously determine |V_ub| and constrain a_2^pi and a_4^pi, the first two Gegenbauer moments of the pion's leading-twist distribution amplitude. We find |V_ub| = (3.2\pm 0.1\pm 0.1\pm 0.3) 10^-3, where the first error is experimental, the second comes from the shape of the form factor in q^2 and the third is a 8% uncertainty from the normalisation of the form factor. We also find a_2^pi(1 GeV)=0.19\pm 0.19 and a_4^pi(1 GeV)\geq -0.07.
|
2312.08478
|
Joshua Eby
|
Joshua Eby, Patrick J. Fox, Graham D. Kribs
|
Earth-Catalyzed Detection of Magnetic Inelastic Dark Matter with Photons
in Large Underground Detectors
|
38 pages, 8 figures, 2 appendices. Ancillary data available at
https://github.com/joshaeby/IsotopeResponses. v2: Version accepted by JHEP,
minor changes, typo fixed in modulation rate calculation resulting in
slightly altering the reach at SUPL (little change to Gran Sasso results)
| null | null | null |
hep-ph
|
http://creativecommons.org/licenses/by/4.0/
|
Inelastic dark matter with moderate splittings, $\mathcal{O}({\rm few} \;
{\rm to} \; 150)$ keV, can upscatter to an excited state in the Earth, with the
excited state subsequently decaying, leaving a distinctive monoenergetic photon
signal in large underground detectors. The photon signal can exhibit
sidereal-daily modulation, providing excellent separation from backgrounds.
Using a detailed numerical simulation, we examine this process as a search
strategy for magnetic inelastic dark matter with the dark matter mass near the
weak scale, where the upscatter to the excited state and decay proceed through
the same magnetic dipole transition operator. At lower inelastic splittings,
the scattering is dominated by moderate mass elements in the Earth with high
spin, especially $^{27}$Al, while at larger splittings, $^{56}$Fe becomes the
dominant target. We show that the proposed large volume gaseous detector CYGNUS
will have excellent sensitivity to this signal. Xenon detectors also provide
excellent sensitivity through the inelastic nuclear recoil signal, and if a
future signal is seen, we show that the synergy among both types of detection
can provide strong evidence for magnetic inelastic dark matter. In the course
we have calculated nuclear response functions for elements relevant for
scattering in the Earth, which are publicly available on GitHub.
|
[
{
"created": "Wed, 13 Dec 2023 19:31:31 GMT",
"version": "v1"
},
{
"created": "Mon, 10 Jun 2024 07:57:27 GMT",
"version": "v2"
}
] |
2024-06-11
|
[
[
"Eby",
"Joshua",
""
],
[
"Fox",
"Patrick J.",
""
],
[
"Kribs",
"Graham D.",
""
]
] |
Inelastic dark matter with moderate splittings, $\mathcal{O}({\rm few} \; {\rm to} \; 150)$ keV, can upscatter to an excited state in the Earth, with the excited state subsequently decaying, leaving a distinctive monoenergetic photon signal in large underground detectors. The photon signal can exhibit sidereal-daily modulation, providing excellent separation from backgrounds. Using a detailed numerical simulation, we examine this process as a search strategy for magnetic inelastic dark matter with the dark matter mass near the weak scale, where the upscatter to the excited state and decay proceed through the same magnetic dipole transition operator. At lower inelastic splittings, the scattering is dominated by moderate mass elements in the Earth with high spin, especially $^{27}$Al, while at larger splittings, $^{56}$Fe becomes the dominant target. We show that the proposed large volume gaseous detector CYGNUS will have excellent sensitivity to this signal. Xenon detectors also provide excellent sensitivity through the inelastic nuclear recoil signal, and if a future signal is seen, we show that the synergy among both types of detection can provide strong evidence for magnetic inelastic dark matter. In the course we have calculated nuclear response functions for elements relevant for scattering in the Earth, which are publicly available on GitHub.
|
2302.01192
|
Patrick Barry
|
P. C. Barry, L. Gamberg, W. Melnitchouk, E. Moffat, D. Pitonyak, A.
Prokudin, N. Sato
|
Tomography of pions and protons via transverse momentum dependent
distributions
|
7 pages, 3 figures; version to appear in Phys. Rev. D
|
Phys. Rev. D 108, L091504 (2023)
|
10.1103/PhysRevD.108.L091504
|
JLAB-THY-23-3749, ADP-23-03/T1212
|
hep-ph hep-ex hep-lat nucl-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We perform the first simultaneous extraction of parton collinear and
transverse degrees of freedom from low-energy fixed-target Drell-Yan data in
order to compare the transverse momentum dependent (TMD) parton distribution
functions (PDFs) of the pion and proton. We demonstrate that the transverse
separation of the quark field encoded in TMDs of the pion is more than $4
\sigma$ smaller than that of the proton. Additionally, we find the transverse
separation of the quark field decreases as its longitudinal momentum fraction
decreases. In studying the nuclear modification of TMDs, we find clear evidence
for a transverse EMC effect. We comment on possible explanations for these
intriguing behaviors, which call for a deeper examination of tomography in a
variety of strongly interacting quark-gluon systems.
|
[
{
"created": "Thu, 2 Feb 2023 16:18:11 GMT",
"version": "v1"
},
{
"created": "Fri, 20 Oct 2023 20:27:08 GMT",
"version": "v2"
}
] |
2023-11-28
|
[
[
"Barry",
"P. C.",
""
],
[
"Gamberg",
"L.",
""
],
[
"Melnitchouk",
"W.",
""
],
[
"Moffat",
"E.",
""
],
[
"Pitonyak",
"D.",
""
],
[
"Prokudin",
"A.",
""
],
[
"Sato",
"N.",
""
]
] |
We perform the first simultaneous extraction of parton collinear and transverse degrees of freedom from low-energy fixed-target Drell-Yan data in order to compare the transverse momentum dependent (TMD) parton distribution functions (PDFs) of the pion and proton. We demonstrate that the transverse separation of the quark field encoded in TMDs of the pion is more than $4 \sigma$ smaller than that of the proton. Additionally, we find the transverse separation of the quark field decreases as its longitudinal momentum fraction decreases. In studying the nuclear modification of TMDs, we find clear evidence for a transverse EMC effect. We comment on possible explanations for these intriguing behaviors, which call for a deeper examination of tomography in a variety of strongly interacting quark-gluon systems.
|
0806.4145
|
Jurgen Reuter
|
Ana Alboteanu (University of Siegen), Wolfgang Kilian (University of
Siegen), Juergen Reuter (University of Freiburg)
|
Resonances and Unitarity in Weak Boson Scattering at the LHC
|
49 pages, 15 figures
|
JHEP 0811:010,2008
|
10.1088/1126-6708/2008/11/010
|
SI-HEP-2008-11
|
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
A crucial test of the Standard Model is the measurement of electroweak
gauge-boson scattering. In this paper, we describe a generic parameterization
aimed at a realistic simulation of weak-boson scattering at the LHC. The
parameterization implements resonances of all possible spin and isospin
combinations, properly matched to the low-energy effective (chiral) Lagrangian,
includes leading higher-order effects and contains a minimal unitarization
scheme. We implement the parameterization in the Monte-Carlo event generator
WHIZARD and present results for complete partonic cross-section integration and
event generation. We provide a comparison with the effective W approximation
that previously has been used for most WW scattering studies at hadron
colliders.
|
[
{
"created": "Wed, 25 Jun 2008 16:37:56 GMT",
"version": "v1"
}
] |
2010-02-03
|
[
[
"Alboteanu",
"Ana",
"",
"University of Siegen"
],
[
"Kilian",
"Wolfgang",
"",
"University of\n Siegen"
],
[
"Reuter",
"Juergen",
"",
"University of Freiburg"
]
] |
A crucial test of the Standard Model is the measurement of electroweak gauge-boson scattering. In this paper, we describe a generic parameterization aimed at a realistic simulation of weak-boson scattering at the LHC. The parameterization implements resonances of all possible spin and isospin combinations, properly matched to the low-energy effective (chiral) Lagrangian, includes leading higher-order effects and contains a minimal unitarization scheme. We implement the parameterization in the Monte-Carlo event generator WHIZARD and present results for complete partonic cross-section integration and event generation. We provide a comparison with the effective W approximation that previously has been used for most WW scattering studies at hadron colliders.
|
2312.17310
|
Luca Di Luzio
|
Luca Di Luzio, Hector Gisbert, Gabriele Levati, Paride Paradisi,
Philip S{\o}rensen
|
CP-Violating Axions: A Theory Review
|
29 pages, 5 figures
| null | null | null |
hep-ph
|
http://creativecommons.org/licenses/by/4.0/
|
We review the physics case for CP-violating axions. In the first part, we
focus on the Quantum Chromodynamics (QCD) axion and argue that new sources of
CP violation beyond QCD misalign the axion solution to the strong CP problem
and can manifest themselves via a tiny scalar axion-nucleon component. We hence
highlight recent advancements in calculating this scalar axion-nucleon
coupling, a parameter that could be probed via axion-mediated force
experiments. In the second part, we focus on axion-like particle (ALP)
interactions entailing the most general sources of CP violation. After
classifying the full set of CP-violating Jarlskog invariants, we report on
recent calculations of ALP contributions to permanent electric dipole moments.
We finally speculate on possible ultraviolet completions of the CP-violating
ALP.
|
[
{
"created": "Thu, 28 Dec 2023 18:59:46 GMT",
"version": "v1"
}
] |
2024-01-01
|
[
[
"Di Luzio",
"Luca",
""
],
[
"Gisbert",
"Hector",
""
],
[
"Levati",
"Gabriele",
""
],
[
"Paradisi",
"Paride",
""
],
[
"Sørensen",
"Philip",
""
]
] |
We review the physics case for CP-violating axions. In the first part, we focus on the Quantum Chromodynamics (QCD) axion and argue that new sources of CP violation beyond QCD misalign the axion solution to the strong CP problem and can manifest themselves via a tiny scalar axion-nucleon component. We hence highlight recent advancements in calculating this scalar axion-nucleon coupling, a parameter that could be probed via axion-mediated force experiments. In the second part, we focus on axion-like particle (ALP) interactions entailing the most general sources of CP violation. After classifying the full set of CP-violating Jarlskog invariants, we report on recent calculations of ALP contributions to permanent electric dipole moments. We finally speculate on possible ultraviolet completions of the CP-violating ALP.
|
2205.12552
|
Natasha Sharma
|
Krzysztof Redlich and Natasha Sharma
|
Exact strangeness conservation in heavy ion collisions
|
8 pages, 4 figures, 19th International Conference of Strangeness in
Quark Matter (SQM 2021)
|
EPJ Web of Conferences 259, 07002 (2022)
|
10.1051/epjconf/202225907002
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We investigate the increase in strangeness production with charged particle
multiplicity ($dN_{ch}/dy$) seen by the ALICE collaboration at CERN in p-p,
p-Pb and Pb-Pb collisions using the hadron resonance gas model. The strangeness
canonical ensemble is used taking into account the interactions among hadrons
using S-matrix corrections based on known phase shift analyses. We show the
essential role of constraints due to the exact conservation of strangeness
which is instrumental to describing observed features of strange particle
yields and their scaling with $dN_{ch}/dy$. Furthermore, the results on
comparing the hadron resonance gas model with and without S-matrix corrections,
are presented. We observe that the interactions introduced by the phase shift
analysis via the S-matrix formalism are essential for a better description of
the yields data independent of collision system. This work is based on our
long-lasting collaboration and most recent publications with Jean Cleymans.
|
[
{
"created": "Wed, 25 May 2022 07:56:38 GMT",
"version": "v1"
}
] |
2022-05-26
|
[
[
"Redlich",
"Krzysztof",
""
],
[
"Sharma",
"Natasha",
""
]
] |
We investigate the increase in strangeness production with charged particle multiplicity ($dN_{ch}/dy$) seen by the ALICE collaboration at CERN in p-p, p-Pb and Pb-Pb collisions using the hadron resonance gas model. The strangeness canonical ensemble is used taking into account the interactions among hadrons using S-matrix corrections based on known phase shift analyses. We show the essential role of constraints due to the exact conservation of strangeness which is instrumental to describing observed features of strange particle yields and their scaling with $dN_{ch}/dy$. Furthermore, the results on comparing the hadron resonance gas model with and without S-matrix corrections, are presented. We observe that the interactions introduced by the phase shift analysis via the S-matrix formalism are essential for a better description of the yields data independent of collision system. This work is based on our long-lasting collaboration and most recent publications with Jean Cleymans.
|
hep-ph/9405229
|
Jean-Bruno Erismann
|
C. Duval, P.A. Horvathy, L. Palla
|
Conformal Properties of Chern-Simons Vortices in External Fields
|
10 pages,CPT-94/p.3028, tex
|
Phys.Rev.D50:6658-6661,1994
|
10.1103/PhysRevD.50.6658
| null |
hep-ph
| null |
The construction and the symmetries of Chern-Simons vortices in harmonic and
uniform magnetic force backgrounds found by Ezawa, Hotta and Iwazaki, and by
Jackiw and Pi are generalized using the non-relativistic Kaluza-Klein-type
framework presented in our previous paper. All Schrodinger-symmetric
backgrounds are determined.
|
[
{
"created": "Thu, 5 May 1994 08:03:53 GMT",
"version": "v1"
}
] |
2019-08-17
|
[
[
"Duval",
"C.",
""
],
[
"Horvathy",
"P. A.",
""
],
[
"Palla",
"L.",
""
]
] |
The construction and the symmetries of Chern-Simons vortices in harmonic and uniform magnetic force backgrounds found by Ezawa, Hotta and Iwazaki, and by Jackiw and Pi are generalized using the non-relativistic Kaluza-Klein-type framework presented in our previous paper. All Schrodinger-symmetric backgrounds are determined.
|
1807.09113
|
Duncan Walker
|
Aude Gehrmann-De Ridder, Thomas Gehrmann, Nigel Glover, Alexander
Huss, Duncan Walker
|
NNLO QCD Corrections to W+jet Production in NNLOJET
|
9 pages, 4 figures, Contribution to the proceedings of the Loops and
Legs conference 2018, 29 April - 4 May 2018, St. Goar, Germany
| null | null | null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We give an overview of our calculation of the next-to-next-to-leading order
(NNLO) QCD corrections to W + jet production in hadronic collisions.
Phenomenological results for multiple differential distributions are compared
to CMS data for 8 TeV proton-proton collisions. We further discuss the
application of the calculation to the transverse momentum spectrum of inclusive
W boson production, again accompanied by a comparison to 8 TeV CMS data. In
both cases, the inclusion of NNLO QCD effects give an improved agreement
between theory and data with considerably reduced scale uncertainties with
respect to the next-to-leading order (NLO) results.
|
[
{
"created": "Tue, 24 Jul 2018 13:53:01 GMT",
"version": "v1"
}
] |
2018-07-25
|
[
[
"Ridder",
"Aude Gehrmann-De",
""
],
[
"Gehrmann",
"Thomas",
""
],
[
"Glover",
"Nigel",
""
],
[
"Huss",
"Alexander",
""
],
[
"Walker",
"Duncan",
""
]
] |
We give an overview of our calculation of the next-to-next-to-leading order (NNLO) QCD corrections to W + jet production in hadronic collisions. Phenomenological results for multiple differential distributions are compared to CMS data for 8 TeV proton-proton collisions. We further discuss the application of the calculation to the transverse momentum spectrum of inclusive W boson production, again accompanied by a comparison to 8 TeV CMS data. In both cases, the inclusion of NNLO QCD effects give an improved agreement between theory and data with considerably reduced scale uncertainties with respect to the next-to-leading order (NLO) results.
|
1103.3394
|
Munshi Golam Mustafa Dr.
|
Najmul Haque, Munshi G. Mustafa, Markus H. Thoma
|
Conserved Density Fluctuation and Temporal Correlation Function in HTL
Perturbation Theory
|
16 pages, 4 figures; One para added in introduction, Fig 1 modified;
Accepted in Phys. Rev. D
|
Phys.Rev. D84 (2011) 054009
|
10.1103/PhysRevD.84.054009
| null |
hep-ph hep-lat nucl-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Considering recently developed Hard Thermal Loop perturbation theory that
takes into account the effect of the variation of the external field through
the fluctuations of a conserved quantity we calculate the temporal component of
the Euclidian correlation function in the vector channel. The results are found
to be in good agreement with the very recent results obtained within the
quenched approximation of QCD and small values of the quark mass ($\sim 0.1T$)
on improved lattices of size $128^3\times N_\tau$ at ($N_\tau=40, \ T=1.2T_C$),
($N_\tau=48, \ T=1.45T_C$), and ($N_\tau=16, \ T=2.98T_C$), where $N_\tau$ is
the temporal extent of the lattice. This suggests that the results from lattice
QCD and Hard Thermal Loop perturbation theory are in close proximity for a
quantity associated with the conserved density fluctuation.
|
[
{
"created": "Thu, 17 Mar 2011 12:33:04 GMT",
"version": "v1"
},
{
"created": "Thu, 1 Sep 2011 08:14:56 GMT",
"version": "v2"
}
] |
2015-03-19
|
[
[
"Haque",
"Najmul",
""
],
[
"Mustafa",
"Munshi G.",
""
],
[
"Thoma",
"Markus H.",
""
]
] |
Considering recently developed Hard Thermal Loop perturbation theory that takes into account the effect of the variation of the external field through the fluctuations of a conserved quantity we calculate the temporal component of the Euclidian correlation function in the vector channel. The results are found to be in good agreement with the very recent results obtained within the quenched approximation of QCD and small values of the quark mass ($\sim 0.1T$) on improved lattices of size $128^3\times N_\tau$ at ($N_\tau=40, \ T=1.2T_C$), ($N_\tau=48, \ T=1.45T_C$), and ($N_\tau=16, \ T=2.98T_C$), where $N_\tau$ is the temporal extent of the lattice. This suggests that the results from lattice QCD and Hard Thermal Loop perturbation theory are in close proximity for a quantity associated with the conserved density fluctuation.
|
1905.05171
|
Luca Rottoli
|
Wojciech Bizon, Aude Gehrmann-De Ridder, Thomas Gehrmann, Nigel
Glover, Alexander Huss, Pier Francesco Monni, Emanuele Re, Luca Rottoli,
Duncan M. Walker
|
The transverse momentum spectrum of weak gauge bosons at N$^3$LL+NNLO
|
10 pages, 5 figures. Version accepted for publication in EPJC.
Corrected small mistake in plotting routines which lead to a minor
misestimate of scale uncertainties in some of the plots. Predictions
available in electronic format in the ancillary file data_paper.txt included
in the submission
| null |
10.1140/epjc/s10052-019-7324-0
| null |
hep-ph hep-ex
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We present accurate QCD predictions for the transverse momentum pT spectrum
of electroweak gauge bosons at the LHC for 13 TeV collisions, based on a
consistent combination of a NNLO calculation at large pT and N3LL resummation
in the small pT limit. The inclusion of higher order corrections leads to
substantial changes in the shape of the differential distributions, and the
residual perturbative uncertainties are reduced to the few percent level across
the whole transverse momentum spectrum. We examine the ratio of pT
distributions in charged- and neutral-current Drell-Yan production, and study
different prescriptions for the estimate of perturbative uncertainties that
rely on different degrees of correlation between these processes. We observe an
excellent stability of the ratios with respect to the perturbative order,
indicating a strong correlation between the corresponding QCD corrections.
|
[
{
"created": "Mon, 13 May 2019 17:58:33 GMT",
"version": "v1"
},
{
"created": "Tue, 29 Oct 2019 20:50:25 GMT",
"version": "v2"
}
] |
2019-10-31
|
[
[
"Bizon",
"Wojciech",
""
],
[
"Ridder",
"Aude Gehrmann-De",
""
],
[
"Gehrmann",
"Thomas",
""
],
[
"Glover",
"Nigel",
""
],
[
"Huss",
"Alexander",
""
],
[
"Monni",
"Pier Francesco",
""
],
[
"Re",
"Emanuele",
""
],
[
"Rottoli",
"Luca",
""
],
[
"Walker",
"Duncan M.",
""
]
] |
We present accurate QCD predictions for the transverse momentum pT spectrum of electroweak gauge bosons at the LHC for 13 TeV collisions, based on a consistent combination of a NNLO calculation at large pT and N3LL resummation in the small pT limit. The inclusion of higher order corrections leads to substantial changes in the shape of the differential distributions, and the residual perturbative uncertainties are reduced to the few percent level across the whole transverse momentum spectrum. We examine the ratio of pT distributions in charged- and neutral-current Drell-Yan production, and study different prescriptions for the estimate of perturbative uncertainties that rely on different degrees of correlation between these processes. We observe an excellent stability of the ratios with respect to the perturbative order, indicating a strong correlation between the corresponding QCD corrections.
|
1901.10302
|
Yi Liao
|
Yi Liao (Nankai Univ and CHEP Peking Univ) and Xiao-Dong Ma (Nankai
Univ)
|
Renormalization Group Evolution of Dimension-seven Operators in Standard
Model Effective Field Theory and Relevant Phenomenology
|
v1: 18 pages, 2 figures, 5 tables. v2: 21 pages, 3 figures, 5 tables,
to appear in jhep; minor revisions made without changing results: (1)
corrected typos; (2) added clarifying statements and three refs; (3) Appendix
expanded by an explicit example of calculation; (4) corrected an error in eq.
(13), thanks to the referee; (5) replaced fig. 2 due to a numerical problem
| null |
10.1007/JHEP03(2019)179
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We showed in a previous publication that there are six independent
dimension-seven operators violating both lepton and baryon numbers ($L=-B=1$)
and twelve ones violating lepton but preserving baryon number ($L=2,~B=0$) in
standard model effective field theory, and we calculated one-loop
renormalization for the former six operators. In this work we continue our
efforts on renormalization of the operators. It turns out this could become
subtle because the operators are connected by nontrivial relations when fermion
flavors are counted. This kind of relations does not appear in lower
dimensional operators. We show how we can extract anomalous dimension matrix
for a flavor-specified basis of operators from counterterms computed for the
above flavor-blind operators without introducing singular inverse Yukawa
coupling matrices. As a phenomenological application, we investigate
renormalization group effects on nuclear neutrinoless double $\beta$ decay. We
also discuss very briefly its analog in the meson sector,
$K^\pm\to\pi^\mp\mu^\pm\mu^\pm$, and indicate potential difficulties to compute
its decay width.
|
[
{
"created": "Tue, 29 Jan 2019 14:22:18 GMT",
"version": "v1"
},
{
"created": "Tue, 26 Mar 2019 12:53:16 GMT",
"version": "v2"
}
] |
2019-05-01
|
[
[
"Liao",
"Yi",
"",
"Nankai Univ and CHEP Peking Univ"
],
[
"Ma",
"Xiao-Dong",
"",
"Nankai\n Univ"
]
] |
We showed in a previous publication that there are six independent dimension-seven operators violating both lepton and baryon numbers ($L=-B=1$) and twelve ones violating lepton but preserving baryon number ($L=2,~B=0$) in standard model effective field theory, and we calculated one-loop renormalization for the former six operators. In this work we continue our efforts on renormalization of the operators. It turns out this could become subtle because the operators are connected by nontrivial relations when fermion flavors are counted. This kind of relations does not appear in lower dimensional operators. We show how we can extract anomalous dimension matrix for a flavor-specified basis of operators from counterterms computed for the above flavor-blind operators without introducing singular inverse Yukawa coupling matrices. As a phenomenological application, we investigate renormalization group effects on nuclear neutrinoless double $\beta$ decay. We also discuss very briefly its analog in the meson sector, $K^\pm\to\pi^\mp\mu^\pm\mu^\pm$, and indicate potential difficulties to compute its decay width.
|
hep-ph/9603372
|
Otto Kong
|
Paul H. Frampton and Otto C. W. Kong (University of North Carolina at
Chapel Hill)
|
Horizontal Symmetry for Quark and Squark Masses in Supersymmetric SU(5)
|
15 pages, latex, 1 latex figure included version to be published in
Phys. Rev. Lett. ; some small changes in notations and presentation, a small
paragragh and 3 references added
|
Phys.Rev.Lett. 77 (1996) 1699-1702
|
10.1103/PhysRevLett.77.1699
|
IFP-725-UNC
|
hep-ph
| null |
Recent interest in horizontal symmetry model building has been driven mainly
by the large top mass and hence strong hierarchy in quark masses, and the
possibility of appropriately constrained soft squark mass matrices, in place of
an assumed universality condition, for satisfying the relevant FCNC
constraints. Here we present the first successful SUSY-$SU(5)$ model that has
such a feature. The horizontal symmetry is a gauged $(Q_{12} \times U(1))_H$
($\subset (SU(2) \times U(1))_H$). All nonrenormalizable terms compatible with
the symmetry are allowed in the mass matrix constructions. Charged lepton
masses can also be accommodated.
|
[
{
"created": "Thu, 21 Mar 1996 21:59:24 GMT",
"version": "v1"
},
{
"created": "Fri, 28 Jun 1996 00:33:17 GMT",
"version": "v2"
}
] |
2009-10-28
|
[
[
"Frampton",
"Paul H.",
"",
"University of North Carolina at\n Chapel Hill"
],
[
"Kong",
"Otto C. W.",
"",
"University of North Carolina at\n Chapel Hill"
]
] |
Recent interest in horizontal symmetry model building has been driven mainly by the large top mass and hence strong hierarchy in quark masses, and the possibility of appropriately constrained soft squark mass matrices, in place of an assumed universality condition, for satisfying the relevant FCNC constraints. Here we present the first successful SUSY-$SU(5)$ model that has such a feature. The horizontal symmetry is a gauged $(Q_{12} \times U(1))_H$ ($\subset (SU(2) \times U(1))_H$). All nonrenormalizable terms compatible with the symmetry are allowed in the mass matrix constructions. Charged lepton masses can also be accommodated.
|
hep-ph/9507288
|
Martin Savage
|
Martin J. Savage (Carnegie Mellon University) and Mark B. Wise
(Caltech)
|
Hyperon Masses in Nuclear Matter
|
8 pages, Revtex. Additional results, sign error corrected
|
Phys.Rev. D53 (1996) 349-354
|
10.1103/PhysRevD.53.349
|
CALT-68-2004, CMU-HEP95-09
|
hep-ph nucl-th
| null |
We analyze hyperon and nucleon mass shifts in nuclear matter using chiral
perturbation theory. Expressions for the mass shifts that include strong
interaction effects at leading order in the density are derived. Corrections to
our results are suppressed by powers of the Fermi momentum divided by either
the chiral symmetry breaking scale or the nucleon mass. Our work is relevant
for neutron stars and for large hypernuclei.
|
[
{
"created": "Tue, 11 Jul 1995 22:31:20 GMT",
"version": "v1"
},
{
"created": "Tue, 18 Jul 1995 23:16:57 GMT",
"version": "v2"
}
] |
2009-10-28
|
[
[
"Savage",
"Martin J.",
"",
"Carnegie Mellon University"
],
[
"Wise",
"Mark B.",
"",
"Caltech"
]
] |
We analyze hyperon and nucleon mass shifts in nuclear matter using chiral perturbation theory. Expressions for the mass shifts that include strong interaction effects at leading order in the density are derived. Corrections to our results are suppressed by powers of the Fermi momentum divided by either the chiral symmetry breaking scale or the nucleon mass. Our work is relevant for neutron stars and for large hypernuclei.
|
1601.02474
|
Maxim Beitel
|
M. Beitel, C. Greiner, H. Stoecker
|
Fast Dynamical Evolution of Hadron Resonance Gas via Hagedorn States
|
5 pages, 7 figures, 1 table
|
Phys. Rev. C 94, 021902 (2016)
|
10.1103/PhysRevC.94.021902
| null |
hep-ph nucl-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Hagedorn states are the key to understand how all hadrons observed in high
energy heavy ion collisions seem to reach thermal equilibrium so quickly. An
assembly of Hagedorn states is formed in elementary hadronic or heavy ion
collisions at hadronization. Microscopic simulations within the transport model
UrQMD allow to study the time evolution of such a pure non-equilibrated
Hagedorn state gas towards a thermally equilibrated Hadron Resonance Gas by
using dynamics, which unlike strings, fully respect detailed balance.
Propagation, repopulation, rescatterings and decays of Hagedorn states provide
the yields of all hadrons up to a mass of m=2.5 GeV. Ratios of feed down
corrected hadron multiplicities are compared to corresponding experimental data
from the ALICE collaboration at LHC. The quick thermalization within t=1-2 fm\c
of the emerging Hadron Resonance Gas exposes Hagedorn states as a tool to
understand hadronization.
|
[
{
"created": "Mon, 11 Jan 2016 15:15:53 GMT",
"version": "v1"
}
] |
2016-09-07
|
[
[
"Beitel",
"M.",
""
],
[
"Greiner",
"C.",
""
],
[
"Stoecker",
"H.",
""
]
] |
Hagedorn states are the key to understand how all hadrons observed in high energy heavy ion collisions seem to reach thermal equilibrium so quickly. An assembly of Hagedorn states is formed in elementary hadronic or heavy ion collisions at hadronization. Microscopic simulations within the transport model UrQMD allow to study the time evolution of such a pure non-equilibrated Hagedorn state gas towards a thermally equilibrated Hadron Resonance Gas by using dynamics, which unlike strings, fully respect detailed balance. Propagation, repopulation, rescatterings and decays of Hagedorn states provide the yields of all hadrons up to a mass of m=2.5 GeV. Ratios of feed down corrected hadron multiplicities are compared to corresponding experimental data from the ALICE collaboration at LHC. The quick thermalization within t=1-2 fm\c of the emerging Hadron Resonance Gas exposes Hagedorn states as a tool to understand hadronization.
|
2405.05653
|
Vladimir A. Petrov
|
Vladimir A. Petrov, Nikolai P. Tkachenko
|
On supposed oscillations of differential cross sections in pp-scattering
at sqrt{s} = 13 TeV
|
9 pages, 5 figures
| null | null | null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
The question of possible existence of oscillations in the region of the
diffraction peak in pp-scattering is considered in detail at sqrt{s}=13 TeV. It
is shown that within the framework of the available experimental data published
by the TOTEM and ALFA/ATLAS collaborations, raising the question of searching
for such a subtle effect looks premature.
|
[
{
"created": "Thu, 9 May 2024 10:01:05 GMT",
"version": "v1"
},
{
"created": "Fri, 17 May 2024 11:47:53 GMT",
"version": "v2"
},
{
"created": "Wed, 19 Jun 2024 10:58:59 GMT",
"version": "v3"
}
] |
2024-06-21
|
[
[
"Petrov",
"Vladimir A.",
""
],
[
"Tkachenko",
"Nikolai P.",
""
]
] |
The question of possible existence of oscillations in the region of the diffraction peak in pp-scattering is considered in detail at sqrt{s}=13 TeV. It is shown that within the framework of the available experimental data published by the TOTEM and ALFA/ATLAS collaborations, raising the question of searching for such a subtle effect looks premature.
|
hep-ph/9505407
| null |
W. Florkowski, J. Huefner, S.P. Klevansky and L. Neise
|
CHIRALLY INVARIANT TRANSPORT EQUATIONS FOR QUARK MATTER
|
21 pages, uuencoded ps file
|
Annals Phys. 245 (1996) 445-463
|
10.1006/aphy.1996.0016
|
HD-TVP-95-5
|
hep-ph
| null |
Transport equations for quark matter are derived in the mean field
approximation for the Nambu -- Jona-Lasinio Lagrangian. Emphasis is put on the
chiral limit (zero current quark masses) and the consequences of the chiral
symmetry are investigated in detail. Our approach is based on the spinor
decomposition of the Wigner function. Kinetic equations for the quark densities
and for the spin are derived. We find that the latter is constrained by the
requirement of the axial current conservation.
|
[
{
"created": "Tue, 30 May 1995 09:22:16 GMT",
"version": "v1"
}
] |
2009-10-28
|
[
[
"Florkowski",
"W.",
""
],
[
"Huefner",
"J.",
""
],
[
"Klevansky",
"S. P.",
""
],
[
"Neise",
"L.",
""
]
] |
Transport equations for quark matter are derived in the mean field approximation for the Nambu -- Jona-Lasinio Lagrangian. Emphasis is put on the chiral limit (zero current quark masses) and the consequences of the chiral symmetry are investigated in detail. Our approach is based on the spinor decomposition of the Wigner function. Kinetic equations for the quark densities and for the spin are derived. We find that the latter is constrained by the requirement of the axial current conservation.
|
2104.08023
|
Kevin Monsalvez-Pozo
|
Carolina Arbel\'aez, Claudio Dib, Kevin Mons\'alvez-Pozo, Iv\'an
Schmidt
|
Quasi-Dirac neutrinos in the linear seesaw model
|
This submission matches the published version. 23 pages, 4 figures
| null |
10.1007/JHEP07(2021)154
| null |
hep-ph hep-ex
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We implement a minimal linear seesaw model (LSM) for addressing the
Quasi-Dirac (QD) behaviour of heavy neutrinos, focusing on the mass regime of
$M_{N} \lesssim M_{W}$. Here we show that for relatively low neutrino masses,
covering the few GeV range, the same-sign to opposite-sign dilepton ratio,
$R_{\ell \ell}$, can be anywhere between 0 and 1, thus signaling a Quasi-Dirac
regime. Particular values of $R_{\ell \ell}$ are controlled by the width of the
QD neutrino and its mass splitting, the latter being equal to the
light-neutrino mass $m_{\nu}$ in the LSM scenario. The current upper bound on
$m_{\nu_{1}}$ together with the projected sensitivities of current and future
$|U_{N \ell}|^{2}$ experimental measurements, set stringent constraints on our
low-scale QD mass regime. Some experimental prospects of testing the model by
LHC displaced vertex searches are also discussed.
|
[
{
"created": "Fri, 16 Apr 2021 10:35:43 GMT",
"version": "v1"
},
{
"created": "Mon, 26 Jul 2021 13:22:14 GMT",
"version": "v2"
}
] |
2021-07-27
|
[
[
"Arbeláez",
"Carolina",
""
],
[
"Dib",
"Claudio",
""
],
[
"Monsálvez-Pozo",
"Kevin",
""
],
[
"Schmidt",
"Iván",
""
]
] |
We implement a minimal linear seesaw model (LSM) for addressing the Quasi-Dirac (QD) behaviour of heavy neutrinos, focusing on the mass regime of $M_{N} \lesssim M_{W}$. Here we show that for relatively low neutrino masses, covering the few GeV range, the same-sign to opposite-sign dilepton ratio, $R_{\ell \ell}$, can be anywhere between 0 and 1, thus signaling a Quasi-Dirac regime. Particular values of $R_{\ell \ell}$ are controlled by the width of the QD neutrino and its mass splitting, the latter being equal to the light-neutrino mass $m_{\nu}$ in the LSM scenario. The current upper bound on $m_{\nu_{1}}$ together with the projected sensitivities of current and future $|U_{N \ell}|^{2}$ experimental measurements, set stringent constraints on our low-scale QD mass regime. Some experimental prospects of testing the model by LHC displaced vertex searches are also discussed.
|
1202.5929
|
Kaniba Mady Keita K.M. Keita
|
Keita Kaniba Mady and Dicko Younouss Hameye
|
Mesons Mass Spectrum in a Modified Soft-Wall AdS/QCD Model
|
8 pages, 1 figure
| null | null | null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We modified the current soft wall model by considering the Non-conformal
aspect low energy QCD.
|
[
{
"created": "Mon, 27 Feb 2012 13:21:13 GMT",
"version": "v1"
}
] |
2012-02-28
|
[
[
"Mady",
"Keita Kaniba",
""
],
[
"Hameye",
"Dicko Younouss",
""
]
] |
We modified the current soft wall model by considering the Non-conformal aspect low energy QCD.
|
hep-ph/0308231
|
Tim Jones
|
I. Jack, D.R.T. Jones and A.F. Kord
|
Three loop soft running, benchmark points and semi-perturbative
unification
|
12 pages, TeX, Uses Harvmac (big) and epsf. Added references (v2).
More emphasis on magnitude of three loop corrections (v3)
|
Phys.Lett. B579 (2004) 180-188
|
10.1016/j.physletb.2003.10.083
|
LTH 587
|
hep-ph
| null |
We consider three-loop $\beta$-function corrections to the sparticle spectrum
in the MSSM, with particular emphasis on Snowmass Benchmark points. The three
loop running has little effect on the weakly interacting particle spectrum, but
for the squark masses the effect can be comparable to, or greater than, that of
two loop running. We extend the analysis to the semi-perturbative unification
scenario, where the impact of the three loop corrections becomes even more
dramatic.
|
[
{
"created": "Fri, 22 Aug 2003 16:50:34 GMT",
"version": "v1"
},
{
"created": "Fri, 3 Oct 2003 14:23:24 GMT",
"version": "v2"
},
{
"created": "Mon, 17 Nov 2003 14:03:39 GMT",
"version": "v3"
}
] |
2010-04-05
|
[
[
"Jack",
"I.",
""
],
[
"Jones",
"D. R. T.",
""
],
[
"Kord",
"A. F.",
""
]
] |
We consider three-loop $\beta$-function corrections to the sparticle spectrum in the MSSM, with particular emphasis on Snowmass Benchmark points. The three loop running has little effect on the weakly interacting particle spectrum, but for the squark masses the effect can be comparable to, or greater than, that of two loop running. We extend the analysis to the semi-perturbative unification scenario, where the impact of the three loop corrections becomes even more dramatic.
|
2108.00947
|
Ming-Zhu Liu
|
Xi-Zhe Ling, Ming-Zhu Liu, Li-Sheng Geng, En Wang and Ju-Jun Xie
|
Can we understand the decay width of the $T_{cc}^+$ state?
| null | null |
10.1016/j.physletb.2022.136897
| null |
hep-ph
|
http://creativecommons.org/licenses/by/4.0/
|
Inspired by the recent discovery of a doubly charmed tetraquark state
$T_{cc}^+$ by the LHCb Collaboration, we employ the effective Lagrangian
approach to investigate the decay width of $T_{cc}^{+}\to D^{+}
D^{0}\pi^{0}/D^{0} D^{0}\pi^{+}$ and $T_{cc}^{+}\to D^{0}D^{+}\gamma$ with the
assumption that $T_{cc}^{+}$ is an isoscalar $DD^{\ast}$ molecule. We show that
both the $T_{cc}\to D D\pi$ and $T_{cc}\to DD\gamma$ modes contribute to the
decay width of $T_{cc}$, with the former being dominant. The resulting total
decay width of about $\Gamma=63$ keV is smaller than the experimental decay
width obtained from the Breit-Wigner fit of the LHCb data, $\Gamma=410\pm
165\pm 43^{+18}_{-38}$ keV, while close to the number obtained from the
alternative unitary analysis, $\Gamma=48\pm 2^{+0}_{-14}$ keV, which supports
the molecular nature of $T_{cc}$.
|
[
{
"created": "Mon, 2 Aug 2021 14:49:02 GMT",
"version": "v1"
},
{
"created": "Tue, 4 Jan 2022 13:13:37 GMT",
"version": "v2"
}
] |
2022-01-19
|
[
[
"Ling",
"Xi-Zhe",
""
],
[
"Liu",
"Ming-Zhu",
""
],
[
"Geng",
"Li-Sheng",
""
],
[
"Wang",
"En",
""
],
[
"Xie",
"Ju-Jun",
""
]
] |
Inspired by the recent discovery of a doubly charmed tetraquark state $T_{cc}^+$ by the LHCb Collaboration, we employ the effective Lagrangian approach to investigate the decay width of $T_{cc}^{+}\to D^{+} D^{0}\pi^{0}/D^{0} D^{0}\pi^{+}$ and $T_{cc}^{+}\to D^{0}D^{+}\gamma$ with the assumption that $T_{cc}^{+}$ is an isoscalar $DD^{\ast}$ molecule. We show that both the $T_{cc}\to D D\pi$ and $T_{cc}\to DD\gamma$ modes contribute to the decay width of $T_{cc}$, with the former being dominant. The resulting total decay width of about $\Gamma=63$ keV is smaller than the experimental decay width obtained from the Breit-Wigner fit of the LHCb data, $\Gamma=410\pm 165\pm 43^{+18}_{-38}$ keV, while close to the number obtained from the alternative unitary analysis, $\Gamma=48\pm 2^{+0}_{-14}$ keV, which supports the molecular nature of $T_{cc}$.
|
hep-ph/0210112
|
Juan Antonio Aguilar Saavedra
|
J. A. Aguilar-Saavedra
|
Effects of mixing with quark singlets
|
LaTeX, 59 pages, 11 PS figures. Corrected the results for the CP
asymmetry in Bs -> Ds+ Ds- and several typos
|
Phys.Rev.D67:035003,2003; Erratum-ibid.D69:099901,2004
|
10.1103/PhysRevD.67.035003 10.1103/PhysRevD.69.099901
|
FISIST/16-2002/CFIF
|
hep-ph hep-ex
| null |
The mixing of the known quarks with new heavy singlets can modify
significantly some observables with respect to the Standard Model predictions.
We analyse the range of deviations permitted by the constraints from precision
electroweak data and flavour-changing neutral processes at low energies. We
study top charged current and neutral current couplings, which will be directly
tested at top factories, like LHC and TESLA. We discuss some examples of
observables from K and B physics, as the branching ratio of K_L -> pi^0 nu nu,
the B^0_s mass difference or the time-dependent CP asymmetry in B_s^0 -> D_s^+
D_s^-, which can also show large new effects.
|
[
{
"created": "Mon, 7 Oct 2002 18:54:48 GMT",
"version": "v1"
},
{
"created": "Mon, 28 Oct 2002 11:23:51 GMT",
"version": "v2"
},
{
"created": "Wed, 4 Dec 2002 16:11:00 GMT",
"version": "v3"
},
{
"created": "Mon, 19 Jan 2004 12:47:07 GMT",
"version": "v4"
}
] |
2014-11-17
|
[
[
"Aguilar-Saavedra",
"J. A.",
""
]
] |
The mixing of the known quarks with new heavy singlets can modify significantly some observables with respect to the Standard Model predictions. We analyse the range of deviations permitted by the constraints from precision electroweak data and flavour-changing neutral processes at low energies. We study top charged current and neutral current couplings, which will be directly tested at top factories, like LHC and TESLA. We discuss some examples of observables from K and B physics, as the branching ratio of K_L -> pi^0 nu nu, the B^0_s mass difference or the time-dependent CP asymmetry in B_s^0 -> D_s^+ D_s^-, which can also show large new effects.
|
1301.0309
|
Chien-Yi Chen
|
Chien-Yi Chen and S. Dawson
|
Exploring Two Higgs Doublet Models Through Higgs Production
|
21 pages, 13 figures; matches published version
| null |
10.1103/PhysRevD.87.055016
| null |
hep-ph hep-ex
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We discuss the connections between the recently observed Higgs-like particle
and rare B decays in the context of two Higgs doublet models (2HDMs). The
measured decays of the Higgs boson to fermions and gauge bosons, along with the
observation of the decay B_s -> \mu+ \mu-, place stringent restrictions on the
allowed parameter space of 2 Higgs doublet models. Future measurements of h0 ->
\gamma \gamma can potentially exclude type I 2HDMs, while the parameters of
other 2HDMs are already severely restricted. The recent observations of the h0
-> \tau+ \tau- and h0 -> b bbar decays further constrain the models.
|
[
{
"created": "Wed, 2 Jan 2013 20:55:08 GMT",
"version": "v1"
},
{
"created": "Tue, 26 Feb 2013 16:41:23 GMT",
"version": "v2"
}
] |
2013-03-27
|
[
[
"Chen",
"Chien-Yi",
""
],
[
"Dawson",
"S.",
""
]
] |
We discuss the connections between the recently observed Higgs-like particle and rare B decays in the context of two Higgs doublet models (2HDMs). The measured decays of the Higgs boson to fermions and gauge bosons, along with the observation of the decay B_s -> \mu+ \mu-, place stringent restrictions on the allowed parameter space of 2 Higgs doublet models. Future measurements of h0 -> \gamma \gamma can potentially exclude type I 2HDMs, while the parameters of other 2HDMs are already severely restricted. The recent observations of the h0 -> \tau+ \tau- and h0 -> b bbar decays further constrain the models.
|
2007.03650
|
Michael E. Peskin
|
Keisuke Fujii, Christophe Grojean, Michael E. Peskin, Tim Barklow,
Yuanning Gao, Shinya Kanemura, Jenny List, Mihoko Nojiri, Maxim Perelstein,
Roman Poeschl, Juergen Reuter, Frank Simon, Tomohiko Tanabe, James D. Wells,
Mikael Berggren, Esteban Fullana, Juan Fuster, Frank Gaede, Stefania Gori,
Daniel Jeans, Adrian Irles, Sunghoon Jung, Shin-Ichi Kawada, Shigeki
Matsumoto, Chris Potter, Jan Strube, Taikan Suehara, Junping Tian, Marcel
Vos, Graham Wilson, Hitoshi Yamamoto, Ryo Yonamine, Aleksander Filip
Zarnecki, James Brau, Hitoshi Murayama
|
ILC Study Questions for Snowmass 2021
|
49 pages, 1 figure, 1 table; v2: correction of some web links; v3:
new Section 3 with a description of the ILC simulation framework put in place
for Snowmass
| null | null |
DESY 20-112, KEK Preprint 2020-8, IFIC/20-34, LCTP-20-14
SLAC-PUB-17543
|
hep-ph hep-ex
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
To aid contributions to the Snowmass 2021 US Community Study on physics at
the International Linear Collider and other proposed $e^+e^-$ colliders, we
present a list of study questions that could be the basis of useful Snowmass
projects. We accompany this with links to references and resources on $e^+e^-$
physics, and a description of a new software framework that we are preparing
for $e^+e^-$ studies at Snowmass.
|
[
{
"created": "Tue, 7 Jul 2020 17:38:57 GMT",
"version": "v1"
},
{
"created": "Sat, 11 Jul 2020 01:44:09 GMT",
"version": "v2"
},
{
"created": "Wed, 20 Jan 2021 19:00:47 GMT",
"version": "v3"
}
] |
2021-01-22
|
[
[
"Fujii",
"Keisuke",
""
],
[
"Grojean",
"Christophe",
""
],
[
"Peskin",
"Michael E.",
""
],
[
"Barklow",
"Tim",
""
],
[
"Gao",
"Yuanning",
""
],
[
"Kanemura",
"Shinya",
""
],
[
"List",
"Jenny",
""
],
[
"Nojiri",
"Mihoko",
""
],
[
"Perelstein",
"Maxim",
""
],
[
"Poeschl",
"Roman",
""
],
[
"Reuter",
"Juergen",
""
],
[
"Simon",
"Frank",
""
],
[
"Tanabe",
"Tomohiko",
""
],
[
"Wells",
"James D.",
""
],
[
"Berggren",
"Mikael",
""
],
[
"Fullana",
"Esteban",
""
],
[
"Fuster",
"Juan",
""
],
[
"Gaede",
"Frank",
""
],
[
"Gori",
"Stefania",
""
],
[
"Jeans",
"Daniel",
""
],
[
"Irles",
"Adrian",
""
],
[
"Jung",
"Sunghoon",
""
],
[
"Kawada",
"Shin-Ichi",
""
],
[
"Matsumoto",
"Shigeki",
""
],
[
"Potter",
"Chris",
""
],
[
"Strube",
"Jan",
""
],
[
"Suehara",
"Taikan",
""
],
[
"Tian",
"Junping",
""
],
[
"Vos",
"Marcel",
""
],
[
"Wilson",
"Graham",
""
],
[
"Yamamoto",
"Hitoshi",
""
],
[
"Yonamine",
"Ryo",
""
],
[
"Zarnecki",
"Aleksander Filip",
""
],
[
"Brau",
"James",
""
],
[
"Murayama",
"Hitoshi",
""
]
] |
To aid contributions to the Snowmass 2021 US Community Study on physics at the International Linear Collider and other proposed $e^+e^-$ colliders, we present a list of study questions that could be the basis of useful Snowmass projects. We accompany this with links to references and resources on $e^+e^-$ physics, and a description of a new software framework that we are preparing for $e^+e^-$ studies at Snowmass.
|
0805.1736
|
Christoph Luhn
|
Christoph Luhn, Pierre Ramond
|
Anomaly Conditions for Non-Abelian Finite Family Symmetries
|
28 pages, Section 6 slightly extended, matches published version
|
JHEP0807:085,2008
|
10.1088/1126-6708/2008/07/085
|
UFIFT-HEP-08-7
|
hep-ph hep-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Assuming that finite family symmetries are gauged, we derive discrete anomaly
conditions for various non-Abelian groups. We thus provide new constraints for
flavor model building, in which discrete non-Abelian symmetries are employed to
explain the tri-bimaximal mixing pattern in the lepton sector.
|
[
{
"created": "Mon, 12 May 2008 20:19:04 GMT",
"version": "v1"
},
{
"created": "Tue, 15 Jul 2008 21:16:41 GMT",
"version": "v2"
}
] |
2008-11-26
|
[
[
"Luhn",
"Christoph",
""
],
[
"Ramond",
"Pierre",
""
]
] |
Assuming that finite family symmetries are gauged, we derive discrete anomaly conditions for various non-Abelian groups. We thus provide new constraints for flavor model building, in which discrete non-Abelian symmetries are employed to explain the tri-bimaximal mixing pattern in the lepton sector.
|
1505.05955
|
Romy Budhi
|
Romy H. S. Budhi, Shoichi Kashiwase, Daijiro Suematsu
|
Constrained inflaton due to a complex scalar
|
16 pages, 4 figures
|
Journal of Cosmology and Astroparticle Physics, Volume 2015,
September 2015
|
10.1088/1475-7516/2015/09/039
| null |
hep-ph astro-ph.CO
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We reexamine inflation due to a constrained inflaton in the model of a
complex scalar. Inflaton evolves along a spiral-like valley of special scalar
potential in the scalar field space just like single field inflation.
Sub-Planckian inflaton can induce sufficient $e$-foldings because of a long
slow-roll path. In a special limit, the scalar spectral index and the
tensor-to-scalar ratio has equivalent expressions to the inflation with
monomial potential $\varphi^n$. The favorable values for them could be obtained
by varying parameters in the potential. This model could be embedded in a
certain radiative neutrino mass model.
|
[
{
"created": "Fri, 22 May 2015 05:37:27 GMT",
"version": "v1"
},
{
"created": "Wed, 27 May 2015 05:24:53 GMT",
"version": "v2"
},
{
"created": "Fri, 18 Sep 2015 19:25:02 GMT",
"version": "v3"
}
] |
2015-12-02
|
[
[
"Budhi",
"Romy H. S.",
""
],
[
"Kashiwase",
"Shoichi",
""
],
[
"Suematsu",
"Daijiro",
""
]
] |
We reexamine inflation due to a constrained inflaton in the model of a complex scalar. Inflaton evolves along a spiral-like valley of special scalar potential in the scalar field space just like single field inflation. Sub-Planckian inflaton can induce sufficient $e$-foldings because of a long slow-roll path. In a special limit, the scalar spectral index and the tensor-to-scalar ratio has equivalent expressions to the inflation with monomial potential $\varphi^n$. The favorable values for them could be obtained by varying parameters in the potential. This model could be embedded in a certain radiative neutrino mass model.
|
2105.09274
|
Alan Kahn
|
Alan Kahn, Julia Gonski, In\^es Ochoa, Daniel Williams, Gustaaf
Brooijmans
|
Anomalous Jet Identification via Sequence Modeling
|
22 pages, 14 figures
| null |
10.1088/1748-0221/16/08/P08012
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
This paper presents a novel method of searching for boosted hadronically
decaying objects by treating them as anomalous elements of a contaminated
dataset. A Variational Recurrent Neural Network (VRNN) is used to model jets as
sequences of constituent four-vectors. After applying a pre-processing method
which boosts each jet to the same reference mass and energy, the VRNN provides
each jet an Anomaly Score that distinguishes between the structure of signal
and background jets. The model is trained in an entirely unsupervised setting
and without high level variables, making the score more robust against mass and
$p_{T}$ correlations when compared to methods based primarily on jet
substructure. Performance is evaluated on the jet level, as well as in an
analysis context by searching for a heavy resonance with a final state of two
boosted jets. The Anomaly Score shows consistent performance along a wide range
of signal contamination amounts, for both two and three-pronged jet
substructure hypotheses. Analysis results demonstrate that the use of Anomaly
Score as a classifier enhances signal sensitivity while retaining a smoothly
falling background jet mass distribution. The model's discriminatory
performance resulting from an unsupervised training scenario opens up the
possibility to train directly on data without a pre-defined signal hypothesis.
|
[
{
"created": "Wed, 19 May 2021 17:39:14 GMT",
"version": "v1"
},
{
"created": "Tue, 25 May 2021 16:40:18 GMT",
"version": "v2"
},
{
"created": "Thu, 8 Jul 2021 14:56:57 GMT",
"version": "v3"
}
] |
2021-09-01
|
[
[
"Kahn",
"Alan",
""
],
[
"Gonski",
"Julia",
""
],
[
"Ochoa",
"Inês",
""
],
[
"Williams",
"Daniel",
""
],
[
"Brooijmans",
"Gustaaf",
""
]
] |
This paper presents a novel method of searching for boosted hadronically decaying objects by treating them as anomalous elements of a contaminated dataset. A Variational Recurrent Neural Network (VRNN) is used to model jets as sequences of constituent four-vectors. After applying a pre-processing method which boosts each jet to the same reference mass and energy, the VRNN provides each jet an Anomaly Score that distinguishes between the structure of signal and background jets. The model is trained in an entirely unsupervised setting and without high level variables, making the score more robust against mass and $p_{T}$ correlations when compared to methods based primarily on jet substructure. Performance is evaluated on the jet level, as well as in an analysis context by searching for a heavy resonance with a final state of two boosted jets. The Anomaly Score shows consistent performance along a wide range of signal contamination amounts, for both two and three-pronged jet substructure hypotheses. Analysis results demonstrate that the use of Anomaly Score as a classifier enhances signal sensitivity while retaining a smoothly falling background jet mass distribution. The model's discriminatory performance resulting from an unsupervised training scenario opens up the possibility to train directly on data without a pre-defined signal hypothesis.
|
0708.2016
|
Yasuhiro Okada
|
Yasuhiro Okada
|
Higgs Particle: The Origin of Mass
|
13 pages, 4 figures, to appear in Special Topics Issue of J. Phys.
Soc. Jpn
|
J.Phys.Soc.Jap.76:111011,2007
|
10.1143/JPSJ.76.111011
|
KEK-TH-1171
|
hep-ph
| null |
The Higgs particle is a new elementary particle predicted in the Standard
Model of the elementary particle physics. It plays a special role in the theory
of mass generation of quarks, leptons, and gauge bosons. In this article,
theoretical issues on the Higgs mechanism are first discussed, and then
experimental prospects on the Higgs particle study at the future collider
experiments, LHC and ILC, are reviewed. The Higgs coupling determination is an
essential step to establish the mass generation mechanism, which could lead to
a deeper understanding of particle physics.
|
[
{
"created": "Wed, 15 Aug 2007 09:50:15 GMT",
"version": "v1"
}
] |
2008-11-26
|
[
[
"Okada",
"Yasuhiro",
""
]
] |
The Higgs particle is a new elementary particle predicted in the Standard Model of the elementary particle physics. It plays a special role in the theory of mass generation of quarks, leptons, and gauge bosons. In this article, theoretical issues on the Higgs mechanism are first discussed, and then experimental prospects on the Higgs particle study at the future collider experiments, LHC and ILC, are reviewed. The Higgs coupling determination is an essential step to establish the mass generation mechanism, which could lead to a deeper understanding of particle physics.
|
hep-ph/0412014
|
Todd M. Tinsley
|
Todd M. Tinsley
|
Pair production with neutrinos and high-intensity laser fields
|
9 pages, 2 figures, uses REVTeX4
|
Phys.Rev. D71 (2005) 073010
|
10.1103/PhysRevD.71.073010
| null |
hep-ph
| null |
We present a detailed calculation of the electron-positron production rate
using neutrinos in an intense laser field. The computation is done for the
process neutrino to neutrino + electron + positron via the neutral channel and
within the framework of the Standard Model. The production rates are tabulated
for a range of incoming neutrino energies in an electromagnetic field similar
to what can be attained by current high-intensity lasers.
|
[
{
"created": "Wed, 1 Dec 2004 19:46:30 GMT",
"version": "v1"
}
] |
2009-11-10
|
[
[
"Tinsley",
"Todd M.",
""
]
] |
We present a detailed calculation of the electron-positron production rate using neutrinos in an intense laser field. The computation is done for the process neutrino to neutrino + electron + positron via the neutral channel and within the framework of the Standard Model. The production rates are tabulated for a range of incoming neutrino energies in an electromagnetic field similar to what can be attained by current high-intensity lasers.
|
hep-ph/0410199
|
Magno Machado
|
V.P. Goncalves, M.V.T. Machado
|
Heavy quark photoproduction in proton-proton collisions
|
15 pages, 5 figures. Version to be published in Physical Review D
|
Phys.Rev.D71:014025,2005
|
10.1103/PhysRevD.71.014025
| null |
hep-ph hep-ex nucl-th
| null |
We calculate the photoproduction of heavy quarks in proton-proton collisions
at RHIC, Tevatron and LHC energies. The integrated cross section and the
rapidity distributions for open charm and bottom production are computed
employing sound high energy QCD formalisms. For the linear pQCD approaches we
consider both the usual collinear factorization and the k_T-factorization
formalisms, whereas for the nonlinear QCD (saturation) calculations one
considers the Golec-Biernat-Wuesthoff and the Iancu-Itakura-Munier
parameterizations for the dipole cross section within the color dipole picture.
|
[
{
"created": "Wed, 13 Oct 2004 20:56:42 GMT",
"version": "v1"
},
{
"created": "Tue, 19 Oct 2004 15:39:43 GMT",
"version": "v2"
},
{
"created": "Wed, 5 Jan 2005 23:16:22 GMT",
"version": "v3"
}
] |
2011-01-25
|
[
[
"Goncalves",
"V. P.",
""
],
[
"Machado",
"M. V. T.",
""
]
] |
We calculate the photoproduction of heavy quarks in proton-proton collisions at RHIC, Tevatron and LHC energies. The integrated cross section and the rapidity distributions for open charm and bottom production are computed employing sound high energy QCD formalisms. For the linear pQCD approaches we consider both the usual collinear factorization and the k_T-factorization formalisms, whereas for the nonlinear QCD (saturation) calculations one considers the Golec-Biernat-Wuesthoff and the Iancu-Itakura-Munier parameterizations for the dipole cross section within the color dipole picture.
|
hep-ph/9302222
|
Bruce Campbell
|
B.A. Campbell, S. Davidson, and K.A. Olive
|
Supersymmetric (S)Neutrino-Mass Induced Baryogenesis
|
preprint numbers: Alberta Thy-31-92, LBL-32888, UMN-TH-1113-92;
Physics Letters B (in press); LATEX file; 8 pages, one figure (not included,
available on request)
|
Phys.Lett.B303:63-67,1993
|
10.1016/0370-2693(93)90044-I
| null |
hep-ph
| null |
We propose a new mechanism for baryogenesis in supersymmetric extensions of
the standard model, that does not depend on (super)GUT interactions. It occurs
by the non-perturbative electroweak reprocessing of a lepton asymmetry. This
lepton asymmetry is generated by the effects of lepton number violating induced
operators, arising from "see-saw" (s)neutrino masses, which act on scalar
condensate oscillations along flat directions of the supersymmetric standard
model.
|
[
{
"created": "Fri, 5 Feb 1993 02:21:24 GMT",
"version": "v1"
}
] |
2009-09-15
|
[
[
"Campbell",
"B. A.",
""
],
[
"Davidson",
"S.",
""
],
[
"Olive",
"K. A.",
""
]
] |
We propose a new mechanism for baryogenesis in supersymmetric extensions of the standard model, that does not depend on (super)GUT interactions. It occurs by the non-perturbative electroweak reprocessing of a lepton asymmetry. This lepton asymmetry is generated by the effects of lepton number violating induced operators, arising from "see-saw" (s)neutrino masses, which act on scalar condensate oscillations along flat directions of the supersymmetric standard model.
|
1712.01049
|
Alejandro Segarra
|
Alejandro Segarra
|
The coherent weak charge of matter
|
3 pages, 2 figures, conference paper from 18th Lomonosov
| null | null | null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We study the long-range force arising between two aggregates of ordinary
matter due to a neutrino-pair exchange, in the limit of zero neutrino mass.
Even if matter is neutral of electric charge, it is charged for this weak
force. The interaction is described in terms of a coherent charge, which we
call the weak flavor charge of aggregated matter. For each one of the
interacting aggregates, this charge depends on the neutrino flavor as
$Q_W^{\nu_e} = 2Z-N$, $Q_W^{\nu_\mu} = Q_W^{\nu_\tau} = -N$, where $Z$ is the
number of protons and $N$ the number of neutrons. $Q_W^{\nu_e}$ depends
explicitly on $Z$ because of the charged current contribution to $\nu_e e$
elastic scattering, while the $N$ term in the three charges comes from the
universal neutral current contribution. The effective potential describing this
force is repulsive and decreases as $r^{-5}$. Due to its specific behavior on
$(Z,N)$ and $r$, this interaction is distinguishable from both gravitation and
residual electromagnetic forces. As neutrinos are massive and mixed, this
potential is valid for $r\lesssim 1/m_\nu$, distances beyond which a
Yukawa-like attenuation kicks in.
|
[
{
"created": "Mon, 4 Dec 2017 12:58:15 GMT",
"version": "v1"
}
] |
2017-12-05
|
[
[
"Segarra",
"Alejandro",
""
]
] |
We study the long-range force arising between two aggregates of ordinary matter due to a neutrino-pair exchange, in the limit of zero neutrino mass. Even if matter is neutral of electric charge, it is charged for this weak force. The interaction is described in terms of a coherent charge, which we call the weak flavor charge of aggregated matter. For each one of the interacting aggregates, this charge depends on the neutrino flavor as $Q_W^{\nu_e} = 2Z-N$, $Q_W^{\nu_\mu} = Q_W^{\nu_\tau} = -N$, where $Z$ is the number of protons and $N$ the number of neutrons. $Q_W^{\nu_e}$ depends explicitly on $Z$ because of the charged current contribution to $\nu_e e$ elastic scattering, while the $N$ term in the three charges comes from the universal neutral current contribution. The effective potential describing this force is repulsive and decreases as $r^{-5}$. Due to its specific behavior on $(Z,N)$ and $r$, this interaction is distinguishable from both gravitation and residual electromagnetic forces. As neutrinos are massive and mixed, this potential is valid for $r\lesssim 1/m_\nu$, distances beyond which a Yukawa-like attenuation kicks in.
|
hep-ph/9505280
|
Svjetlana Fajfer, Ijs
|
S. Fajfer
|
Saturation of counterterms by resonances in $K \to \pi e^{+} e^{-}$
decays
|
24 pages, LaTeX
|
Z.Phys. C71 (1996) 307-312
|
10.1007/BF02906988
| null |
hep-ph
| null |
The decays $K^{+} \rightarrow \pi^{+} e^{+} e^{-}$, $K_{S} \rightarrow
\pi^{0} e^{+} e^{-}$ and $K_{L} \rightarrow \pi^{0} e^{+} e^{-}$ are
reinvestigated within the framework of chiral perturbation theory. The
counterterms induced by strong, electromagnetic and weak interactions are
determined assuming the resonance exchange. The weak deformation model, the
factorization model and the large $N_{c}$ limit are used to create a weak
Lagrangian. It is found that the results of the first two approaches depend on
the $H_{1}$ coupling, defined in the effective chiral Lagrangian of the ${\it
O} (p^{4})$ order. The set of parameters used in the extended Nambu and
Jona-Lasinio model can accommodete $K^{+} \rightarrow \pi^{+} e^{+} e^{-}$
decay rate within the factorization approach. The CP violating $K_{L}
\rightarrow \pi^{0} e^{+} e^{-}$ decay rate is discussed.
|
[
{
"created": "Thu, 11 May 1995 15:43:26 GMT",
"version": "v1"
}
] |
2009-10-28
|
[
[
"Fajfer",
"S.",
""
]
] |
The decays $K^{+} \rightarrow \pi^{+} e^{+} e^{-}$, $K_{S} \rightarrow \pi^{0} e^{+} e^{-}$ and $K_{L} \rightarrow \pi^{0} e^{+} e^{-}$ are reinvestigated within the framework of chiral perturbation theory. The counterterms induced by strong, electromagnetic and weak interactions are determined assuming the resonance exchange. The weak deformation model, the factorization model and the large $N_{c}$ limit are used to create a weak Lagrangian. It is found that the results of the first two approaches depend on the $H_{1}$ coupling, defined in the effective chiral Lagrangian of the ${\it O} (p^{4})$ order. The set of parameters used in the extended Nambu and Jona-Lasinio model can accommodete $K^{+} \rightarrow \pi^{+} e^{+} e^{-}$ decay rate within the factorization approach. The CP violating $K_{L} \rightarrow \pi^{0} e^{+} e^{-}$ decay rate is discussed.
|
1105.5136
|
Alexander Merle
|
Alexander Merle and Viviana Niro
|
Deriving Models for keV sterile Neutrino Dark Matter with the
Froggatt-Nielsen mechanism
|
37 pages, 3 figures; comment on astrophysical constraints and new
section 4.9 on proton decay added, plus some minor changes; matches published
version in JCAP
|
JCAP07(2011)023
|
10.1088/1475-7516/2011/07/023
| null |
hep-ph astro-ph.CO
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Sterile neutrinos with a mass around the keV scale are an attractive particle
physics candidate for Warm Dark Matter. Although many frameworks have been
presented in which these neutrinos can fulfill all phenomenological
constraints, there are hardly any models known that can explain such a peculiar
mass pattern, one sterile neutrino at the keV scale and the other two
considerably heavier, while at the same time being compatible with low-energy
neutrino data. In this paper, we present models based on the Froggatt-Nielsen
mechanism, which can give such an explanation. We explain how to assign
Froggatt-Nielsen charges in a successful way, and we give a detailed discussion
of all conditions to be fulfilled. It turns out that the typical arbitrariness
of the charge assignments is greatly reduced when trying to carefully account
for all constraints. We furthermore present analytical calculations of a few
simplified models, while quasi-perfect models are found numerically.
|
[
{
"created": "Wed, 25 May 2011 20:00:04 GMT",
"version": "v1"
},
{
"created": "Wed, 27 Jul 2011 11:24:22 GMT",
"version": "v2"
}
] |
2015-03-19
|
[
[
"Merle",
"Alexander",
""
],
[
"Niro",
"Viviana",
""
]
] |
Sterile neutrinos with a mass around the keV scale are an attractive particle physics candidate for Warm Dark Matter. Although many frameworks have been presented in which these neutrinos can fulfill all phenomenological constraints, there are hardly any models known that can explain such a peculiar mass pattern, one sterile neutrino at the keV scale and the other two considerably heavier, while at the same time being compatible with low-energy neutrino data. In this paper, we present models based on the Froggatt-Nielsen mechanism, which can give such an explanation. We explain how to assign Froggatt-Nielsen charges in a successful way, and we give a detailed discussion of all conditions to be fulfilled. It turns out that the typical arbitrariness of the charge assignments is greatly reduced when trying to carefully account for all constraints. We furthermore present analytical calculations of a few simplified models, while quasi-perfect models are found numerically.
|
hep-ph/0512251
|
Matteo Cacciari
|
Matteo Cacciari
|
QCD Predictions for Charm and Bottom Production at RHIC
|
4 pages, to appear in the proceedings of the International
Europhysics Conference on High Energy Physics, 21-27 July 2005, Lisbon,
Portugal
| null | null |
LPTHE-P05-07
|
hep-ph
| null |
We present up-to-date QCD predictions for open charm and bottom production at
RHIC in nucleon-nucleon collisions at \sqrt{S} = 200 GeV. The electron spectrum
resulting from heavy flavor decays is also evaluated for direct comparison to
the PHENIX and STAR data. These predictions seek to establish a rigorous
benchmark, including the theoretical uncertainties, against which nuclear
collision data can be compared to obtain evidence for nuclear effects.
|
[
{
"created": "Tue, 20 Dec 2005 11:00:34 GMT",
"version": "v1"
}
] |
2007-05-23
|
[
[
"Cacciari",
"Matteo",
""
]
] |
We present up-to-date QCD predictions for open charm and bottom production at RHIC in nucleon-nucleon collisions at \sqrt{S} = 200 GeV. The electron spectrum resulting from heavy flavor decays is also evaluated for direct comparison to the PHENIX and STAR data. These predictions seek to establish a rigorous benchmark, including the theoretical uncertainties, against which nuclear collision data can be compared to obtain evidence for nuclear effects.
|
hep-ph/9605202
|
Takehiko Asaka
|
T. Asaka, Y. Shobuda and Y. Sumino ( Department of Physics, Tohoku
University )
|
Top Mass and Isospin Breaking in Dynamical Symmetry Breaking Scenario
|
29 pages, 12 Postscript figures, LaTeX uses epsf.sty, epsfig.sty, and
psfig.sty. Only Report # is corrected to TU-503
|
Phys.Rev. D54 (1996) 5698-5704
|
10.1103/PhysRevD.54.5698
|
TU-503
|
hep-ph
| null |
We consider a scenario where the top-quark mass is generated dynamically, and
study the implication of the present experimental values for $m_t$ and the $T$
parameter. We assume technicolor-like scenario for inducing the $W$ mass and an
effective four fermi operator for inducing the top-quark mass. We also assume
that only this four fermi operator is relevant at low energy. Then we estimate
in detail the strength $G$ and the intrinsic mass scale $M$ of the four fermi
operator. Unitarity bound is used to quantify the strength of $G$. We find that
$G/4\pi \sim {\cal O}(1)$ and that $M$ is of the order of $\Lambda_{TC} \simeq
1 \sim 2$~TeV or less. Namely the four fermi operator cannot be treated as
`point-like' around the electroweak scale. Furthermore we estimate the
contribution of the four fermi operator to the $T$ parameter. We find that the
QCD correction to the top-quark mass function reduces the contribution to the
$T$ parameter by about 40\%. By comparing the results with the present
experimental bound, we obtain another upper bound on $M$ which is typically in
several to 10~TeV region.
|
[
{
"created": "Wed, 1 May 1996 15:08:17 GMT",
"version": "v1"
},
{
"created": "Tue, 7 May 1996 14:37:39 GMT",
"version": "v2"
}
] |
2009-10-28
|
[
[
"Asaka",
"T.",
"",
"Department of Physics, Tohoku\n University"
],
[
"Shobuda",
"Y.",
"",
"Department of Physics, Tohoku\n University"
],
[
"Sumino",
"Y.",
"",
"Department of Physics, Tohoku\n University"
]
] |
We consider a scenario where the top-quark mass is generated dynamically, and study the implication of the present experimental values for $m_t$ and the $T$ parameter. We assume technicolor-like scenario for inducing the $W$ mass and an effective four fermi operator for inducing the top-quark mass. We also assume that only this four fermi operator is relevant at low energy. Then we estimate in detail the strength $G$ and the intrinsic mass scale $M$ of the four fermi operator. Unitarity bound is used to quantify the strength of $G$. We find that $G/4\pi \sim {\cal O}(1)$ and that $M$ is of the order of $\Lambda_{TC} \simeq 1 \sim 2$~TeV or less. Namely the four fermi operator cannot be treated as `point-like' around the electroweak scale. Furthermore we estimate the contribution of the four fermi operator to the $T$ parameter. We find that the QCD correction to the top-quark mass function reduces the contribution to the $T$ parameter by about 40\%. By comparing the results with the present experimental bound, we obtain another upper bound on $M$ which is typically in several to 10~TeV region.
|
0812.1939
|
Agnieszka Grzeli\'nska
|
Henryk Czyz, Agnieszka Grzelinska and Agnieszka Wapienik
|
Status of Phokhara
|
Presented at 10th International Workshop On Tau Lepton Physics, BINP,
Novosibirsk, Russia, 22-25 Sep 2008, 6 pages
|
Nucl.Phys.Proc.Suppl.189:216-221,2009
|
10.1016/j.nuclphysbps.2009.03.037
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
A review of the status of the Monte Carlo event generator PHOKHARA, developed
for experiments using the radiative return method. The four-pion production in
electron-positron annihilation and in tau-lepton decays and the narrow
resonances studies are described.
|
[
{
"created": "Wed, 10 Dec 2008 16:04:10 GMT",
"version": "v1"
}
] |
2009-08-03
|
[
[
"Czyz",
"Henryk",
""
],
[
"Grzelinska",
"Agnieszka",
""
],
[
"Wapienik",
"Agnieszka",
""
]
] |
A review of the status of the Monte Carlo event generator PHOKHARA, developed for experiments using the radiative return method. The four-pion production in electron-positron annihilation and in tau-lepton decays and the narrow resonances studies are described.
|
2008.07937
|
Yong-Jiang Xu
|
Yong-Jiang Xu, Yong-Lu Liu, and Ming-Qiu Huang
|
The magnetic moment of $P_{c}(4312)$ as a $\bar{D}\Sigma_{c}$ molecular
state
|
12pages,4figures. published version
|
Eur.Phys.J.C 81 (2021) 5, 421
|
10.1140/epjc/s10052-021-09211-8
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
In this paper, we tentatively assign the $P_{c}(4312)$ to be a
$\bar{D}\Sigma_{c}$ molecular state with quantum number
$J^{P}=\frac{1}{2}^{-}$, and calculate its magnetic moment using the QCD sum
rule method in external weak electromagnetic field. Starting with the two-point
correlation function in external electromagnetic field and expanding it in
power of the electromagnetic interaction Hamiltonian, we extract the magnetic
moment from the linear response to the external electromagnetic field. The
numerical value of the magnetic moment of $P_{c}(4312)$ is
$\mu_{P_{c}}=1.75^{+0.15}_{-0.11}$.
|
[
{
"created": "Sun, 16 Aug 2020 12:23:28 GMT",
"version": "v1"
},
{
"created": "Wed, 19 May 2021 14:17:55 GMT",
"version": "v2"
}
] |
2021-05-20
|
[
[
"Xu",
"Yong-Jiang",
""
],
[
"Liu",
"Yong-Lu",
""
],
[
"Huang",
"Ming-Qiu",
""
]
] |
In this paper, we tentatively assign the $P_{c}(4312)$ to be a $\bar{D}\Sigma_{c}$ molecular state with quantum number $J^{P}=\frac{1}{2}^{-}$, and calculate its magnetic moment using the QCD sum rule method in external weak electromagnetic field. Starting with the two-point correlation function in external electromagnetic field and expanding it in power of the electromagnetic interaction Hamiltonian, we extract the magnetic moment from the linear response to the external electromagnetic field. The numerical value of the magnetic moment of $P_{c}(4312)$ is $\mu_{P_{c}}=1.75^{+0.15}_{-0.11}$.
|
1105.3911
|
James Barry
|
James Barry, Werner Rodejohann and He Zhang
|
Light Sterile Neutrinos: Models and Phenomenology
|
30 pages, 6 figures; v2: minor additions, references added, matches
published version
|
JHEP 1107:091,2011
|
10.1007/JHEP07(2011)091
| null |
hep-ph hep-ex
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Motivated by recent hints in particle physics and cosmology, we study the
realization of eV-scale sterile neutrinos within both the seesaw mechanism and
flavor symmetry theories. We show that light sterile neutrinos can rather
easily be accommodated in the popular A_4 flavor symmetry models. The exact
tri-bimaximal mixing pattern is perturbed due to active-sterile mixing, which
we discuss in detail for one example. In addition, we find an interesting
extension of the type I seesaw, which can provide a natural origin for eV-scale
sterile neutrinos as well as visible admixtures between sterile and active
neutrinos. We also show that the presence of sterile neutrinos would
significantly change the observables in neutrino experiments, specifically the
oscillation probabilities in short-baseline experiments and the effective mass
in neutrino-less double beta decay. The latter can prove particularly helpful
to strengthen the case for eV-scale sterile neutrinos.
|
[
{
"created": "Thu, 19 May 2011 15:24:33 GMT",
"version": "v1"
},
{
"created": "Thu, 21 Jul 2011 12:32:51 GMT",
"version": "v2"
}
] |
2011-07-22
|
[
[
"Barry",
"James",
""
],
[
"Rodejohann",
"Werner",
""
],
[
"Zhang",
"He",
""
]
] |
Motivated by recent hints in particle physics and cosmology, we study the realization of eV-scale sterile neutrinos within both the seesaw mechanism and flavor symmetry theories. We show that light sterile neutrinos can rather easily be accommodated in the popular A_4 flavor symmetry models. The exact tri-bimaximal mixing pattern is perturbed due to active-sterile mixing, which we discuss in detail for one example. In addition, we find an interesting extension of the type I seesaw, which can provide a natural origin for eV-scale sterile neutrinos as well as visible admixtures between sterile and active neutrinos. We also show that the presence of sterile neutrinos would significantly change the observables in neutrino experiments, specifically the oscillation probabilities in short-baseline experiments and the effective mass in neutrino-less double beta decay. The latter can prove particularly helpful to strengthen the case for eV-scale sterile neutrinos.
|
hep-ph/9605261
| null |
F. Palumbo
|
Lower scaling dimensions of quarks and gluons and new energy scales
|
10 pages, LaTeX file
| null | null |
LNF-96/021(IR)
|
hep-ph
| null |
We consider the possibility that quarks and gluons, due to confinement, have
lower scaling dimensions. In such a case there appear naturally new energy
scales below which the standard theory is recovered. Arguments are given
whereby for dimension $1/2$ of the quarks the theory is unitary also above
these energy scales.
|
[
{
"created": "Wed, 8 May 1996 16:19:38 GMT",
"version": "v1"
}
] |
2007-05-23
|
[
[
"Palumbo",
"F.",
""
]
] |
We consider the possibility that quarks and gluons, due to confinement, have lower scaling dimensions. In such a case there appear naturally new energy scales below which the standard theory is recovered. Arguments are given whereby for dimension $1/2$ of the quarks the theory is unitary also above these energy scales.
|
2001.02159
|
Gerhard Grensing
|
G. Grensing
|
Dark Matter and Torsion
|
10 pages hep-th, astro-ph.CO
|
Gen. Rel. Grav. 53 (2021) 49
|
10.1007/s10714-021-02812-4
| null |
hep-ph hep-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Superheavy right-handed Majorana neutrinos are proposed as a promising
candidate for dark matter, with dynamical axial torsion as the mediating agent.
|
[
{
"created": "Mon, 6 Jan 2020 14:24:21 GMT",
"version": "v1"
}
] |
2022-01-25
|
[
[
"Grensing",
"G.",
""
]
] |
Superheavy right-handed Majorana neutrinos are proposed as a promising candidate for dark matter, with dynamical axial torsion as the mediating agent.
|
hep-ph/0311122
|
Kai-Peer Oliver Diener
|
K.-P. O. Diener
|
New Predictions for Electroweak O(\alpha) Corrections to
Neutrino--Nucleon Scattering
|
3 pages, in collaboration with S. Dittmaier and W. Hollik,
proceedings contribution to International Europhysics Conference on High
Energy Physics, EPS (July 17th-23rd 2003) in Aachen, Germany
|
Eur.Phys.J.C33:s662-s664,2004
|
10.1140/epjcd/s2004-03-1841-9
| null |
hep-ph
| null |
We calculate the O(\alpha) electroweak corrections to charged- and
neutral-current deep-inelastic neutrino scattering off an isoscalar target. The
full one-loop-corrected cross sections, including hard photonic corrections,
are evaluated and compared to an earlier result which is the basis of the NuTeV
analysis. In particular, we compare results that differ in input-parameter
scheme, treatment of real photon radiation and factorization scheme. The
associated shifts in the theoretical prediction for the ratio of neutral- and
charged-current cross sections can be larger than the experimental accuracy of
the NuTeV result.
|
[
{
"created": "Mon, 10 Nov 2003 15:49:54 GMT",
"version": "v1"
}
] |
2011-09-13
|
[
[
"Diener",
"K. -P. O.",
""
]
] |
We calculate the O(\alpha) electroweak corrections to charged- and neutral-current deep-inelastic neutrino scattering off an isoscalar target. The full one-loop-corrected cross sections, including hard photonic corrections, are evaluated and compared to an earlier result which is the basis of the NuTeV analysis. In particular, we compare results that differ in input-parameter scheme, treatment of real photon radiation and factorization scheme. The associated shifts in the theoretical prediction for the ratio of neutral- and charged-current cross sections can be larger than the experimental accuracy of the NuTeV result.
|
1605.05535
|
Kazem Azizi
|
K. Azizi, N. Er, H. Sundu
|
Scalar and vector self-energies of heavy baryons in nuclear medium
|
13 Pages, 11 Figures and 5 Tables
| null |
10.1016/j.nuclphysa.2017.02.007
| null |
hep-ph nucl-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
The in-medium sum rules are employed to calculate the shifts in the mass and
residue as well as the scalar and vector self-energies of the heavy $\Lambda_Q,
\Sigma_Q$ and $\Xi_Q$ baryons, with Q being $b$ or $c$ quark. The maximum shift
in mass due to nuclear matter belongs to the $\Sigma_c$ baryon and it is found
to be $\Delta m_{\Sigma_{c}}=-936 ~ MeV$. In the case of residue, it is
obtained that the residue of $\Sigma_b$ baryon is maximally affected by the
nuclear medium with the shift $\Delta \lambda_{\Sigma_b} = -0.014 ~ GeV^3 $.
The scalar and vector self-energies are found to be $\Sigma^{S}_{\Lambda_b} =
653 ~ MeV$, $\Sigma^{S}_{\Sigma_b} = -614 ~ MeV $, $\Sigma^{S}_{\Xi_b} = -17 ~
MeV $, $\Sigma^{S}_{\Lambda_c} = 272 ~ MeV $, $\Sigma^{S}_{\Sigma_c} = -936 ~
MeV $, $\Sigma^{S}_{\Xi_c} = -5 ~ MeV $ and $\Sigma^{\nu}_{\Lambda_b} = 436 \pm
148 ~ MeV $, $\Sigma^{\nu}_{\Sigma_b} = 382 \pm 129 ~MeV $,
$\Sigma^{\nu}_{\Xi_b} =15 \pm 5 ~ MeV$, $\Sigma^{\nu}_{\Lambda_c} = 151 \pm 45
~ MeV $, $\Sigma^{\nu}_{\Sigma_c} = 486 \pm 144 ~ MeV $ and
$\Sigma^{\nu}_{\Xi_c} = 1.391 \pm 0.529 ~ MeV $.
|
[
{
"created": "Wed, 18 May 2016 12:01:26 GMT",
"version": "v1"
},
{
"created": "Tue, 8 Nov 2016 09:18:13 GMT",
"version": "v2"
},
{
"created": "Fri, 10 Feb 2017 07:03:37 GMT",
"version": "v3"
},
{
"created": "Fri, 31 Mar 2017 07:21:44 GMT",
"version": "v4"
}
] |
2017-04-05
|
[
[
"Azizi",
"K.",
""
],
[
"Er",
"N.",
""
],
[
"Sundu",
"H.",
""
]
] |
The in-medium sum rules are employed to calculate the shifts in the mass and residue as well as the scalar and vector self-energies of the heavy $\Lambda_Q, \Sigma_Q$ and $\Xi_Q$ baryons, with Q being $b$ or $c$ quark. The maximum shift in mass due to nuclear matter belongs to the $\Sigma_c$ baryon and it is found to be $\Delta m_{\Sigma_{c}}=-936 ~ MeV$. In the case of residue, it is obtained that the residue of $\Sigma_b$ baryon is maximally affected by the nuclear medium with the shift $\Delta \lambda_{\Sigma_b} = -0.014 ~ GeV^3 $. The scalar and vector self-energies are found to be $\Sigma^{S}_{\Lambda_b} = 653 ~ MeV$, $\Sigma^{S}_{\Sigma_b} = -614 ~ MeV $, $\Sigma^{S}_{\Xi_b} = -17 ~ MeV $, $\Sigma^{S}_{\Lambda_c} = 272 ~ MeV $, $\Sigma^{S}_{\Sigma_c} = -936 ~ MeV $, $\Sigma^{S}_{\Xi_c} = -5 ~ MeV $ and $\Sigma^{\nu}_{\Lambda_b} = 436 \pm 148 ~ MeV $, $\Sigma^{\nu}_{\Sigma_b} = 382 \pm 129 ~MeV $, $\Sigma^{\nu}_{\Xi_b} =15 \pm 5 ~ MeV$, $\Sigma^{\nu}_{\Lambda_c} = 151 \pm 45 ~ MeV $, $\Sigma^{\nu}_{\Sigma_c} = 486 \pm 144 ~ MeV $ and $\Sigma^{\nu}_{\Xi_c} = 1.391 \pm 0.529 ~ MeV $.
|
hep-ph/9412272
|
Roland Hoepker
|
W. Beenakker, R. H\"opker, M. Spira and P.M. Zerwas
|
Squark Production at the Tevatron
|
7 pages + 3 figures as uuencoded ps files, Latex, complete postscript
version at ftp://x4u2.desy.de/pub/preprints/desy/1994/desy94-212.ps
|
Phys.Rev.Lett. 74 (1995) 2905-2908
|
10.1103/PhysRevLett.74.2905
|
DESY 94-212
|
hep-ph
| null |
We have determined the QCD corrections to the production of squark-antisquark
pairs in $p\bar p$ collisions at the Tevatron. If the next-to-leading order
corrections are taken into account, the renormalization/factorization scale
dependence of the theoretical prediction for the cross section is reduced
considerably. The higher order corrections increase the production cross
section at the Tevatron by about a factor two if we compare the next-to-leading
order prediction at a scale near the squark mass with the lowest order
prediction for which, in the experimental analyses, the scale was identified
with the invariant energy of the parton subprocess. This results in a rise of
the experimental lower bound on the squark mass from the Tevatron by about $20$
GeV.
|
[
{
"created": "Mon, 12 Dec 1994 10:40:05 GMT",
"version": "v1"
}
] |
2009-10-28
|
[
[
"Beenakker",
"W.",
""
],
[
"Höpker",
"R.",
""
],
[
"Spira",
"M.",
""
],
[
"Zerwas",
"P. M.",
""
]
] |
We have determined the QCD corrections to the production of squark-antisquark pairs in $p\bar p$ collisions at the Tevatron. If the next-to-leading order corrections are taken into account, the renormalization/factorization scale dependence of the theoretical prediction for the cross section is reduced considerably. The higher order corrections increase the production cross section at the Tevatron by about a factor two if we compare the next-to-leading order prediction at a scale near the squark mass with the lowest order prediction for which, in the experimental analyses, the scale was identified with the invariant energy of the parton subprocess. This results in a rise of the experimental lower bound on the squark mass from the Tevatron by about $20$ GeV.
|
hep-ph/9906474
|
Ma Jian-ping
|
J.P. Ma
|
The Mass Effect in Quarkonium Decay
|
The work is re-done with a correct starting ponit, the main result is
the relativistic correction can be represented by the mass difference
| null | null | null |
hep-ph
| null |
In the NRQCD factorization for productions and decays of a quakonium the
difference between the quarkonium mass and the twice of the heavy quark mass is
neglected at the leading order of the small velocity expansion. The effect of
this difference is included in the relativistic correction. We attempt to
define the difference in terms of NRQCD matrix elements and to separate the
effect of the difference in several decays. It turns out that the total
relativistic correcttion can be estimated by the difference. Numerically the
correction will enhance the decay widths considered here.
|
[
{
"created": "Thu, 24 Jun 1999 04:37:14 GMT",
"version": "v1"
},
{
"created": "Wed, 29 Sep 1999 03:39:08 GMT",
"version": "v2"
}
] |
2007-05-23
|
[
[
"Ma",
"J. P.",
""
]
] |
In the NRQCD factorization for productions and decays of a quakonium the difference between the quarkonium mass and the twice of the heavy quark mass is neglected at the leading order of the small velocity expansion. The effect of this difference is included in the relativistic correction. We attempt to define the difference in terms of NRQCD matrix elements and to separate the effect of the difference in several decays. It turns out that the total relativistic correcttion can be estimated by the difference. Numerically the correction will enhance the decay widths considered here.
|
hep-ph/0101329
|
Chao-Qiang Geng
|
C.Q. Geng
|
Anomaly, Charge Quantization and Family
|
7 pages, LaTex file, Proceedings of the International Workshop on
Nonperturbative Methods and Lattice QCD, Guangzhou, China
| null |
10.1142/9789812811370_0030
| null |
hep-ph
| null |
We first review the three known chiral anomalies in four dimensions and then
use the anomaly free conditions to study the uniqueness of quark and lepton
representations and charge quantizations in the standard model. We also extend
our results to theory with an arbitrary number of color. Finally, we discuss
the family problem.
|
[
{
"created": "Tue, 30 Jan 2001 08:12:33 GMT",
"version": "v1"
}
] |
2017-08-23
|
[
[
"Geng",
"C. Q.",
""
]
] |
We first review the three known chiral anomalies in four dimensions and then use the anomaly free conditions to study the uniqueness of quark and lepton representations and charge quantizations in the standard model. We also extend our results to theory with an arbitrary number of color. Finally, we discuss the family problem.
|
1112.6386
|
Francesco Hautmann
|
M. Deak, F. Hautmann, H. Jung and K. Kutak
|
Transverse Energy Flow with Forward and Central Jets at the LHC
|
Contributed at the XLVI Rencontres de Moriond, March 2011
| null | null | null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
At the LHC, using forward + central detectors, it becomes possible for the
first time to carry out measurements of the transverse energy flow due to
``minijets" accompanying production of two jets separated by a large rapidity
interval. We discuss parton-shower calculations of energy flow observables in a
high-energy factorized Monte Carlo framework, and comment on the role of these
observables to study high parton multiplicity effects.
|
[
{
"created": "Thu, 29 Dec 2011 19:20:47 GMT",
"version": "v1"
}
] |
2011-12-30
|
[
[
"Deak",
"M.",
""
],
[
"Hautmann",
"F.",
""
],
[
"Jung",
"H.",
""
],
[
"Kutak",
"K.",
""
]
] |
At the LHC, using forward + central detectors, it becomes possible for the first time to carry out measurements of the transverse energy flow due to ``minijets" accompanying production of two jets separated by a large rapidity interval. We discuss parton-shower calculations of energy flow observables in a high-energy factorized Monte Carlo framework, and comment on the role of these observables to study high parton multiplicity effects.
|
1709.08954
|
Eugene Levin
|
E. Gotsman (Tel Aviv U.) and E. Levin (Tel Aviv U./UTFSM)
|
Azimuthal angle correlations at large rapidities: revisiting density
variation mechanism
|
26 pp., 12 figures in pdf files
| null |
10.1140/epjc/s10052-017-5350-3
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
In the paper we discuss the angular correlation present in hadron-hadron
collisions at large rapidity difference ($\bas\,y_{12}\,\gg\,1$). We find that
in the CGC/saturation approach the largest contribution stems from the density
variation mechanism. Our principal results are that the odd Fourier
harmonics($v_{2n+1}$), decrease substantially as function of $y_{12}$, while
the even harmonics ($v_{2n}$ ), increase considerably with a growth of
$y_{12}$.
|
[
{
"created": "Tue, 26 Sep 2017 11:57:46 GMT",
"version": "v1"
}
] |
2017-12-06
|
[
[
"Gotsman",
"E.",
"",
"Tel Aviv U."
],
[
"Levin",
"E.",
"",
"Tel Aviv U./UTFSM"
]
] |
In the paper we discuss the angular correlation present in hadron-hadron collisions at large rapidity difference ($\bas\,y_{12}\,\gg\,1$). We find that in the CGC/saturation approach the largest contribution stems from the density variation mechanism. Our principal results are that the odd Fourier harmonics($v_{2n+1}$), decrease substantially as function of $y_{12}$, while the even harmonics ($v_{2n}$ ), increase considerably with a growth of $y_{12}$.
|
hep-ph/0010023
|
Michael Ramsey-Musolf
|
M.J. Ramsey-Musolf
|
Searching for T-Violating, P-Conserving New Physics with Neutrons
|
To appear in proceedings of Workshop on Fundamental Physics with
Pulsed Neutron Beams, held at the Research Triangle Park, North Carolina,
June 1 -- 3, 2000. Nine pages
| null |
10.1142/9789812811189_0007
| null |
hep-ph nucl-th
| null |
The observance of parity conserving time reversal violation in light quark
systems could signal the presence of physics beyond the Standard Model. I
discuss the implications of low-energy time reversal tests for the existence of
such T-violating, P-conserving (TVPC) interactions. I argue that searches for
permanent electric dipole moments (EDM's) and direct TVPC searches provide
complementary information on P-conserving T-violation. EDM searches yield
constraints only under the assumption that parity symmetry is restored at the
scale Lambda associated with new TVPC physics. If parity remains broken at
short distances, direct searches yield the least ambiguous bounds. In the
latter case, improving the experimental precision of direct TVPC searches in
neutron beta-decay and polarized epithermal neutron transmission at the
Spallation Neutron Source could yield tighter bounds.
|
[
{
"created": "Tue, 3 Oct 2000 20:18:05 GMT",
"version": "v1"
}
] |
2016-11-23
|
[
[
"Ramsey-Musolf",
"M. J.",
""
]
] |
The observance of parity conserving time reversal violation in light quark systems could signal the presence of physics beyond the Standard Model. I discuss the implications of low-energy time reversal tests for the existence of such T-violating, P-conserving (TVPC) interactions. I argue that searches for permanent electric dipole moments (EDM's) and direct TVPC searches provide complementary information on P-conserving T-violation. EDM searches yield constraints only under the assumption that parity symmetry is restored at the scale Lambda associated with new TVPC physics. If parity remains broken at short distances, direct searches yield the least ambiguous bounds. In the latter case, improving the experimental precision of direct TVPC searches in neutron beta-decay and polarized epithermal neutron transmission at the Spallation Neutron Source could yield tighter bounds.
|
hep-ph/9905433
|
Keum Yong-Yeon
|
D. S. Hwang(Sejong Univ.) and Y.-Y. Keum(KEK)
|
Factorization and Decay Constants $f_{D_s^*}$ and $f_{D_s}$
|
Latex file, 18 pages, no figure
|
Phys.Rev.D61:073003,2000
|
10.1103/PhysRevD.61.073003
|
Preprint KEK-TH-626
|
hep-ph
| null |
We calculate the decay constants of $D_s$ and $D_s^{*}$ with $\bar{B}^0 \ra
D^{+}\ell^{-}\nu$ and $\bar{B}^0 \ra D^{+}D_s^{-(*)}$ decays. In our analysis
we take the factorization method including non-factorizable term contributions
and used two different form factor behaviours (constant and monopole-type) for
$F_0(q^2)$. We also consider the QCD-penguin and Electroweak-penguin
contributions in hadronic decays within the NDR renormalization scheme at NLO
calculation. We estimate the decay constant of the $D_s$ meson to be $233\pm49$
${\rm MeV}$ for (pole/pole)-type form factor and $255\pm54$ ${\rm MeV}$ for
(pole/constant)-type form factor. For $D_s^{*}$ meson, we get $f_{D_s^{*}} =
346 \pm 82$ ${\rm MeV}$, and $f_{D_s^{*}}/f_{D_s} = 1.43 \pm 0.45$ for
(pole/constant)-type form factor.
|
[
{
"created": "Fri, 21 May 1999 08:27:01 GMT",
"version": "v1"
}
] |
2008-11-26
|
[
[
"Hwang",
"D. S.",
"",
"Sejong Univ."
],
[
"Keum",
"Y. -Y.",
"",
"KEK"
]
] |
We calculate the decay constants of $D_s$ and $D_s^{*}$ with $\bar{B}^0 \ra D^{+}\ell^{-}\nu$ and $\bar{B}^0 \ra D^{+}D_s^{-(*)}$ decays. In our analysis we take the factorization method including non-factorizable term contributions and used two different form factor behaviours (constant and monopole-type) for $F_0(q^2)$. We also consider the QCD-penguin and Electroweak-penguin contributions in hadronic decays within the NDR renormalization scheme at NLO calculation. We estimate the decay constant of the $D_s$ meson to be $233\pm49$ ${\rm MeV}$ for (pole/pole)-type form factor and $255\pm54$ ${\rm MeV}$ for (pole/constant)-type form factor. For $D_s^{*}$ meson, we get $f_{D_s^{*}} = 346 \pm 82$ ${\rm MeV}$, and $f_{D_s^{*}}/f_{D_s} = 1.43 \pm 0.45$ for (pole/constant)-type form factor.
|
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