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|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
1010.3818 | Dong Phung Van | P. V. Dong, H. N. Long | A simple model of gauged lepton and baryon charges | 13 pages, revised version | Physics International 6, 23 (2015) | 10.3844/pisp.2015.23.32 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We argue that simpler fermionic contents, responsible for the extension of
the standard model with gauged lepton and baryon charges, can be constructed by
assuming existence of so-called leptoquarks (j,k) with exotic electric charges
q_j=1/2, q_k=-1/2. Some new features in our model are that (i) as the natural
consequences of anomaly cancelation the right-handed neutrinos exist, and the
number of the observed fermion families is equal to the number of the
fundamental colors; (ii) although the lepton and baryon charges are conserved,
the neutrinos can obtain small masses through the type I seesaw mechanism in
similarity to the standard context, and the baryogenesis can be generated in
several cases. They all are natural results due to the spontaneous breaking of
these charges. Some constraints on the new physics via flavor changing and
related phenomenologies such as the stable scalar with anomalous electric
charge and interested processes at colliders are also discussed.
| [
{
"created": "Tue, 19 Oct 2010 07:15:24 GMT",
"version": "v1"
},
{
"created": "Wed, 29 Dec 2010 11:08:11 GMT",
"version": "v2"
},
{
"created": "Wed, 31 Aug 2011 06:39:43 GMT",
"version": "v3"
}
] | 2017-05-25 | [
[
"Dong",
"P. V.",
""
],
[
"Long",
"H. N.",
""
]
] | We argue that simpler fermionic contents, responsible for the extension of the standard model with gauged lepton and baryon charges, can be constructed by assuming existence of so-called leptoquarks (j,k) with exotic electric charges q_j=1/2, q_k=-1/2. Some new features in our model are that (i) as the natural consequences of anomaly cancelation the right-handed neutrinos exist, and the number of the observed fermion families is equal to the number of the fundamental colors; (ii) although the lepton and baryon charges are conserved, the neutrinos can obtain small masses through the type I seesaw mechanism in similarity to the standard context, and the baryogenesis can be generated in several cases. They all are natural results due to the spontaneous breaking of these charges. Some constraints on the new physics via flavor changing and related phenomenologies such as the stable scalar with anomalous electric charge and interested processes at colliders are also discussed. |
hep-ph/0209338 | Nikolai Romanenko | Nikolai Romanenko | Signatures of Right-Handed Majorana neutrinos and gauge bosons in $e
\gamma$ Collisions | 18 pages, 7 figures, LaTeX | Phys.Rev.D67:033002,2003 | 10.1103/PhysRevD.67.033002 | null | hep-ph | null | The process $e^- \gamma \to e^+ W_R^- W_R^-$ is studied in the framework of
the Left-Right symmetric model. It is shown that this reaction and $e^- \gamma
\to l^+
W_R^- W_R^-$ for the arbitrary final lepton are likely to be discovered for
CLIC collider option.
For relatively light doubly charged Higgs boson its mass does not have much
influence on the discovery potential, while for heavier values the probability
of the reaction increases.
| [
{
"created": "Fri, 27 Sep 2002 20:38:15 GMT",
"version": "v1"
},
{
"created": "Thu, 28 Nov 2002 16:17:10 GMT",
"version": "v2"
}
] | 2008-11-26 | [
[
"Romanenko",
"Nikolai",
""
]
] | The process $e^- \gamma \to e^+ W_R^- W_R^-$ is studied in the framework of the Left-Right symmetric model. It is shown that this reaction and $e^- \gamma \to l^+ W_R^- W_R^-$ for the arbitrary final lepton are likely to be discovered for CLIC collider option. For relatively light doubly charged Higgs boson its mass does not have much influence on the discovery potential, while for heavier values the probability of the reaction increases. |
hep-ph/0312346 | M. D. Scadron | D.V. Bugg, M.D. Scadron | The pion nucleon coupling constant and the Goldberger-Treiman relation | 15 pages, no figures. Accepted for publication in Euro. Phys. J C | null | null | null | hep-ph | null | The latest $\pi N$ elastic scattering data are re-analysed to determine the
coupling constant $g_c$ of the charged pion, using the dispersion relation for
the invariant amplitude $B^{(+)}$. Depending on the choice of data-base, values
$g^2_c/4\pi = 13.80$ to 13.65 are obtained with errors of $\pm 0.12$. We
re-examine the well known discrepancy with the Goldberger-Treiman relation.
After allowing for the mass dependence of the pion decay constant $f_\pi$, a
(2-3)% discrepancy is predicted, hence $g^2_c/4\pi = 13.74 \pm 0.10$ in the
prior case.
The mass difference between charge states of $\Delta (1232)$ is $M^0 -M^{++}
= 2.0 \pm 0.4$ MeV, close to twice the mass difference between neutron and
proton. The difference in widths on resonance is $\Gamma ^0 - \Gamma ^{++} =3.8
\pm 1.0$ MeV. One may account for a width difference of 4.5 MeV from phase
space for decays and the extra channel $\Delta ^0 \to \gamma n$.
| [
{
"created": "Thu, 25 Dec 2003 00:22:40 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Bugg",
"D. V.",
""
],
[
"Scadron",
"M. D.",
""
]
] | The latest $\pi N$ elastic scattering data are re-analysed to determine the coupling constant $g_c$ of the charged pion, using the dispersion relation for the invariant amplitude $B^{(+)}$. Depending on the choice of data-base, values $g^2_c/4\pi = 13.80$ to 13.65 are obtained with errors of $\pm 0.12$. We re-examine the well known discrepancy with the Goldberger-Treiman relation. After allowing for the mass dependence of the pion decay constant $f_\pi$, a (2-3)% discrepancy is predicted, hence $g^2_c/4\pi = 13.74 \pm 0.10$ in the prior case. The mass difference between charge states of $\Delta (1232)$ is $M^0 -M^{++} = 2.0 \pm 0.4$ MeV, close to twice the mass difference between neutron and proton. The difference in widths on resonance is $\Gamma ^0 - \Gamma ^{++} =3.8 \pm 1.0$ MeV. One may account for a width difference of 4.5 MeV from phase space for decays and the extra channel $\Delta ^0 \to \gamma n$. |
hep-ph/0608025 | Bruce Knuteson | Bruce Knuteson | Solution to the LHC Inverse Problem | Talk presented at DIS 2006 and PHENO 2006; 4 pages | null | 10.1142/9789812706706_0078 | null | hep-ph hep-ex | null | The "LHC Inverse Problem" refers to the question of determining the
underlying physical theory giving rise to the signals expected to be seen at
the Large Hadron Collider. The solution to this problem (Bard) is reviewed. The
combination of CDF and D0 data is motivated.
| [
{
"created": "Wed, 2 Aug 2006 21:30:51 GMT",
"version": "v1"
}
] | 2017-08-23 | [
[
"Knuteson",
"Bruce",
""
]
] | The "LHC Inverse Problem" refers to the question of determining the underlying physical theory giving rise to the signals expected to be seen at the Large Hadron Collider. The solution to this problem (Bard) is reviewed. The combination of CDF and D0 data is motivated. |
hep-ph/0606244 | Robert Thorne S | R.S. Thorne, A.D. Martin and W.J. Stirling | MRST Parton Distributions -- status 2006 | 5 pages, 5 figures included as .ps files, presented at the DIS2006
meeting, April 19-24, Tsukuba, Japan | null | 10.1142/9789812706706_0011 | null | hep-ph | null | We present the new preliminary MRST parton distributions at NLO and NNLO. The
analysis includes some new data and there is an improvement in the theoretical
treatment at NNLO. Essentially complete NNLO partons are presented for the
first time, together with uncertainties.
| [
{
"created": "Thu, 22 Jun 2006 17:00:12 GMT",
"version": "v1"
}
] | 2017-08-23 | [
[
"Thorne",
"R. S.",
""
],
[
"Martin",
"A. D.",
""
],
[
"Stirling",
"W. J.",
""
]
] | We present the new preliminary MRST parton distributions at NLO and NNLO. The analysis includes some new data and there is an improvement in the theoretical treatment at NNLO. Essentially complete NNLO partons are presented for the first time, together with uncertainties. |
1111.5331 | Alexander Friedland | Alexander Friedland, Michael L. Graesser, Ian M. Shoemaker, Luca
Vecchi (Los Alamos) | Probing Nonstandard Standard Model Backgrounds with LHC Monojets | updated to match the PLB version; references added, discussion
updated and expanded, particularly in the multilepton section | Physics Letters B 714 (2012), pp. 267-275 | 10.1016/j.physletb.2012.06.078 | LA-UR-11-11724 | hep-ph hep-ex nucl-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Monojet events at colliders have been used to probe models of dark matter and
extra dimensions. We point out that these events also probe extensions of the
Standard Model modifying neutrino-quark interactions. Such nonstandard
interactions (NSI) have been discussed in connection with neutrino oscillation
experiments. Assuming first that NSI remain contact at LHC energies, we derive
stringent bounds that approach the levels suggested by the Boron-8 solar data.
We next explore the possibility that the mediators of the NSI can be produced
at colliders. The constraints are found to be strongest for mediator masses in
the 10^2-10^3 GeV range, with the best bounds above ~ 200 GeV coming from ATLAS
and below from CDF. For mediators with masses below 30 GeV the monojet bounds
are weaker than in the contact limit. These results also directly apply to
light dark matter searches. Lastly, we discuss how neutrino NSI can be
distinguished from dark matter or Kaluza-Klein states with charged lepton
searches.
| [
{
"created": "Tue, 22 Nov 2011 21:00:01 GMT",
"version": "v1"
},
{
"created": "Fri, 9 Dec 2011 23:17:06 GMT",
"version": "v2"
},
{
"created": "Fri, 13 Jul 2012 01:19:00 GMT",
"version": "v3"
}
] | 2012-07-31 | [
[
"Friedland",
"Alexander",
"",
"Los Alamos"
],
[
"Graesser",
"Michael L.",
"",
"Los Alamos"
],
[
"Shoemaker",
"Ian M.",
"",
"Los Alamos"
],
[
"Vecchi",
"Luca",
"",
"Los Alamos"
]
] | Monojet events at colliders have been used to probe models of dark matter and extra dimensions. We point out that these events also probe extensions of the Standard Model modifying neutrino-quark interactions. Such nonstandard interactions (NSI) have been discussed in connection with neutrino oscillation experiments. Assuming first that NSI remain contact at LHC energies, we derive stringent bounds that approach the levels suggested by the Boron-8 solar data. We next explore the possibility that the mediators of the NSI can be produced at colliders. The constraints are found to be strongest for mediator masses in the 10^2-10^3 GeV range, with the best bounds above ~ 200 GeV coming from ATLAS and below from CDF. For mediators with masses below 30 GeV the monojet bounds are weaker than in the contact limit. These results also directly apply to light dark matter searches. Lastly, we discuss how neutrino NSI can be distinguished from dark matter or Kaluza-Klein states with charged lepton searches. |
hep-ph/0009117 | Alexander Pankov | A.A. Pankov and N. Paver | Model independent constraints on contact interactions from LEP2 | 9 pages (Latex) with 6 figures and 1 table | Phys.Lett.B493:307-314,2000 | 10.1016/S0370-2693(00)01106-0 | IC/2000/136 | hep-ph | null | We quantitatively discuss the possibility of deriving model-independent
constraints on the general four-fermion contact interaction couplings, from the
currently available data on the two-fermion production processes
$e^+e^-\to\mu^+\mu^-$, $b\bar{b}$ and $c\bar{c}$ with unpolarized initial
beams. The method is essentially based on particular, simple, combinations of
the measured total cross section and forward-backward asymmetry that allow
partial separation of the helicity cross sections, and the combination of
experimental data obtained at the different energies of TRISTAN, LEP1 and LEP2.
| [
{
"created": "Mon, 11 Sep 2000 10:32:40 GMT",
"version": "v1"
}
] | 2011-01-25 | [
[
"Pankov",
"A. A.",
""
],
[
"Paver",
"N.",
""
]
] | We quantitatively discuss the possibility of deriving model-independent constraints on the general four-fermion contact interaction couplings, from the currently available data on the two-fermion production processes $e^+e^-\to\mu^+\mu^-$, $b\bar{b}$ and $c\bar{c}$ with unpolarized initial beams. The method is essentially based on particular, simple, combinations of the measured total cross section and forward-backward asymmetry that allow partial separation of the helicity cross sections, and the combination of experimental data obtained at the different energies of TRISTAN, LEP1 and LEP2. |
1001.3146 | Xin-Nian Wang | Jian-Hua Gao, Zuo-tang Liang and Xin-Nian Wang | Nuclear dependence of azimuthal asymmetry in semi-inclusive deep
inelastic scattering | 9 pages in RevTex with 2 figures | Phys.Rev.C81:065211,2010 | 10.1103/PhysRevC.81.065211 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Within the framework of a generalized factorization, semi-inclusive deeply
inelastic scattering (SIDIS) cross sections can be expressed as a series of
products of collinear hard parts and transverse-momentum-dependent (TMD) parton
distributions and correlations. The azimuthal asymmetry <cos\phi>$ of
unpolarized SIDIS in the small transverse momentum region will depend on both
twist-2 and 3 TMD quark distributions in target nucleons or nuclei. Nuclear
broadening of these twist-2 and 3 quark distributions due to final-state
multiple scattering in nuclei is investigated and the nuclear dependence of the
azimuthal asymmetry $<\cos\phi>$ is studied. It is shown that the azimuthal
asymmetry is suppressed by multiple parton scattering and the transverse
momentum dependence of the suppression depends on the relative shape of the
twist-2 and 3 quark distributions in the nucleon. A Gaussian ansatz for TMD
twist-2 and 3 quark distributions in nucleon is used to demonstrate the nuclear
dependence of the azimuthal asymmetry and to estimate the smearing effect due
to fragmentation.
| [
{
"created": "Mon, 18 Jan 2010 21:08:21 GMT",
"version": "v1"
}
] | 2014-11-20 | [
[
"Gao",
"Jian-Hua",
""
],
[
"Liang",
"Zuo-tang",
""
],
[
"Wang",
"Xin-Nian",
""
]
] | Within the framework of a generalized factorization, semi-inclusive deeply inelastic scattering (SIDIS) cross sections can be expressed as a series of products of collinear hard parts and transverse-momentum-dependent (TMD) parton distributions and correlations. The azimuthal asymmetry <cos\phi>$ of unpolarized SIDIS in the small transverse momentum region will depend on both twist-2 and 3 TMD quark distributions in target nucleons or nuclei. Nuclear broadening of these twist-2 and 3 quark distributions due to final-state multiple scattering in nuclei is investigated and the nuclear dependence of the azimuthal asymmetry $<\cos\phi>$ is studied. It is shown that the azimuthal asymmetry is suppressed by multiple parton scattering and the transverse momentum dependence of the suppression depends on the relative shape of the twist-2 and 3 quark distributions in the nucleon. A Gaussian ansatz for TMD twist-2 and 3 quark distributions in nucleon is used to demonstrate the nuclear dependence of the azimuthal asymmetry and to estimate the smearing effect due to fragmentation. |
0911.3848 | Norberto N. Scoccola | G.A. Contrera, D. Gomez Dumm, Norberto N. Scoccola | Meson properties at finite temperature in a three flavor nonlocal chiral
quark model with Polyakov loop | 21 pages, 4 figures. Fig. 3 and final part of Sect. IV modified,
references added, conclusions unchanged. To be published in Phys. Rev. D | Phys.Rev.D81:054005,2010 | 10.1103/PhysRevD.81.054005 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the finite temperature behavior of light scalar and pseudoscalar
meson properties in the context of a three-flavor nonlocal chiral quark model.
The model includes mixing with active strangeness degrees of freedom, and takes
care of the effect of gauge interactions by coupling the quarks with the
Polyakov loop. We analyze the chiral restoration and deconfinement transitions,
as well as the temperature dependence of meson masses, mixing angles and decay
constants. The critical temperature is found to be T_c = 202 MeV, in better
agreement with lattice results than the value recently obtained in the local
SU(3) PNJL model. It is seen that above T_c pseudoscalar meson masses get
increased, becoming degenerate with the masses of their chiral partners. The
temperatures at which this matching occurs depend on the strange quark
composition of the corresponding mesons. The topological susceptibility shows a
sharp decrease after the chiral transition, signalling the vanishing of the
U(1)_A anomaly for large temperatures.
| [
{
"created": "Thu, 19 Nov 2009 17:29:02 GMT",
"version": "v1"
},
{
"created": "Thu, 4 Feb 2010 20:38:18 GMT",
"version": "v2"
}
] | 2010-04-06 | [
[
"Contrera",
"G. A.",
""
],
[
"Dumm",
"D. Gomez",
""
],
[
"Scoccola",
"Norberto N.",
""
]
] | We study the finite temperature behavior of light scalar and pseudoscalar meson properties in the context of a three-flavor nonlocal chiral quark model. The model includes mixing with active strangeness degrees of freedom, and takes care of the effect of gauge interactions by coupling the quarks with the Polyakov loop. We analyze the chiral restoration and deconfinement transitions, as well as the temperature dependence of meson masses, mixing angles and decay constants. The critical temperature is found to be T_c = 202 MeV, in better agreement with lattice results than the value recently obtained in the local SU(3) PNJL model. It is seen that above T_c pseudoscalar meson masses get increased, becoming degenerate with the masses of their chiral partners. The temperatures at which this matching occurs depend on the strange quark composition of the corresponding mesons. The topological susceptibility shows a sharp decrease after the chiral transition, signalling the vanishing of the U(1)_A anomaly for large temperatures. |
hep-ph/9408288 | null | Dieter Stoll | Gauge fixing by unitary transformations in QCD | email: stoll@tkyux.phys.s.u-tokyo.ac.jp; 8 pages LaTex; Paper to be
published in Physics Letters B | Phys.Lett. B336 (1994) 518-523 | 10.1016/0370-2693(94)90566-5 | null | hep-ph | null | The unitary gauge fixing technique is applied to the QCD hamiltonian
formulated in terms of angular variables. It is demonstrated that in this
formulation projections on the physical Hilbert space are unnecessary to
separate physical and unphysical degrees of freedom. Therefore the application
of the unitary gauge fixing technique can be extended to the operator level.
| [
{
"created": "Mon, 15 Aug 1994 18:40:57 GMT",
"version": "v1"
}
] | 2009-10-28 | [
[
"Stoll",
"Dieter",
""
]
] | The unitary gauge fixing technique is applied to the QCD hamiltonian formulated in terms of angular variables. It is demonstrated that in this formulation projections on the physical Hilbert space are unnecessary to separate physical and unphysical degrees of freedom. Therefore the application of the unitary gauge fixing technique can be extended to the operator level. |
1410.0404 | Stanley J. Brodsky | Stanley J. Brodsky | Novel QCD Phenomena at the LHC: The Ridge, Digluon-Initiated
Subprocesses, Direct Reactions, Non-Universal Antishadowing, and Forward
Higgs Production | Presented at the 17th International Conference on Quantum
Chromodynamics (QCD 14), June 30-July 4, 2014, Montpellier, France | null | null | SLAC-PUB-16079 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | I discuss a number of novel tests of QCD at the LHC, measurements which can
illuminate fundamental features of hadron physics. I also review the "Principle
of Maximum Conformality" (PMC) which systematically sets the renormalization
scale order-by-order in pQCD, eliminating an unnecessary theoretical
uncertainty. The PMC allows LHC experiments to test QCD much more precisely,
and the sensitivity of LHC measurements to physics beyond the Standard Model is
increased.
| [
{
"created": "Wed, 1 Oct 2014 22:44:48 GMT",
"version": "v1"
}
] | 2014-10-03 | [
[
"Brodsky",
"Stanley J.",
""
]
] | I discuss a number of novel tests of QCD at the LHC, measurements which can illuminate fundamental features of hadron physics. I also review the "Principle of Maximum Conformality" (PMC) which systematically sets the renormalization scale order-by-order in pQCD, eliminating an unnecessary theoretical uncertainty. The PMC allows LHC experiments to test QCD much more precisely, and the sensitivity of LHC measurements to physics beyond the Standard Model is increased. |
1407.1990 | Jakub Wagner | A.T. Goritschnig, B. Pire, Jakub Wagner | Timelike deeply virtual Compton scattering with a linearly polarized
real (or quasi-real) photon beam | To appear in the proceedings XXII. International Workshop on Deep
Inelastic Scattering and Related Subjects (DIS 2014), 28 April - 2 May 2014,
Warsaw, Poland | null | null | null | hep-ph nucl-ex nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We calculate timelike virtual Compton scattering amplitudes in the
generalized Bjorken scaling regime and focus on a new polarization asymmetry in
the scattering process with a linearly polarized photon beam in the medium
energy range, which will be studied intensely at JLab12 experiments. We
demonstrate that new observables help us to access the polarized quark and
gluon generalized parton distributions $\tilde H(x, \xi, t)$ and $ \tilde E(x,
\xi, t)$.
| [
{
"created": "Tue, 8 Jul 2014 08:31:35 GMT",
"version": "v1"
}
] | 2014-07-09 | [
[
"Goritschnig",
"A. T.",
""
],
[
"Pire",
"B.",
""
],
[
"Wagner",
"Jakub",
""
]
] | We calculate timelike virtual Compton scattering amplitudes in the generalized Bjorken scaling regime and focus on a new polarization asymmetry in the scattering process with a linearly polarized photon beam in the medium energy range, which will be studied intensely at JLab12 experiments. We demonstrate that new observables help us to access the polarized quark and gluon generalized parton distributions $\tilde H(x, \xi, t)$ and $ \tilde E(x, \xi, t)$. |
hep-ph/0604169 | Anthony Zee | Pavel Kovtun and A. Zee | A schematic model of neutrinos | 4 pages | Phys.Lett. B640 (2006) 37-39 | 10.1016/j.physletb.2006.07.037 | NSF-KITP-06-28 | hep-ph | null | We show that the observed pattern for neutrino mixing arises naturally if
neutrinos are composites of more elementary constituents carrying an SU(2)
quantum number we call lepospin.
| [
{
"created": "Wed, 19 Apr 2006 20:44:08 GMT",
"version": "v1"
}
] | 2009-11-11 | [
[
"Kovtun",
"Pavel",
""
],
[
"Zee",
"A.",
""
]
] | We show that the observed pattern for neutrino mixing arises naturally if neutrinos are composites of more elementary constituents carrying an SU(2) quantum number we call lepospin. |
2102.13652 | Niko Koivunen | Juan Carlos Criado, Abdelhak Djouadi, Niko Koivunen, Martti Raidal,
Hardi Veerm\"ae | Higher-spin particles at high-energy colliders | Published version. 38 pages, 6 figures. Comments welcome | null | 10.1007/JHEP05(2021)254 | null | hep-ph hep-ex hep-th nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Using an effective field theory approach for higher-spin fields, we derive
the interactions of colour singlet and electrically neutral particles with a
spin higher than unity, concentrating on the spin-3/2, spin-2, spin-5/2 and
spin-3 cases. We compute the decay rates and production cross sections in the
main channels for spin-3/2 and spin-2 states at both electron-positron and
hadron colliders, and identify the most promising novel experimental signatures
for discovering such particles at the LHC. The discussion is qualitatively
extended to the spin-5/2 and spin-3 cases. Higher-spin particles exhibit a rich
phenomenology and have signatures that often resemble the ones of
supersymmetric and extra-dimensional theories. To enable further studies of
higher-spin particles at collider and beyond, we collect the relevant Feynman
rules and other technical details.
| [
{
"created": "Fri, 26 Feb 2021 18:58:07 GMT",
"version": "v1"
},
{
"created": "Sat, 22 May 2021 10:28:29 GMT",
"version": "v2"
}
] | 2021-06-16 | [
[
"Criado",
"Juan Carlos",
""
],
[
"Djouadi",
"Abdelhak",
""
],
[
"Koivunen",
"Niko",
""
],
[
"Raidal",
"Martti",
""
],
[
"Veermäe",
"Hardi",
""
]
] | Using an effective field theory approach for higher-spin fields, we derive the interactions of colour singlet and electrically neutral particles with a spin higher than unity, concentrating on the spin-3/2, spin-2, spin-5/2 and spin-3 cases. We compute the decay rates and production cross sections in the main channels for spin-3/2 and spin-2 states at both electron-positron and hadron colliders, and identify the most promising novel experimental signatures for discovering such particles at the LHC. The discussion is qualitatively extended to the spin-5/2 and spin-3 cases. Higher-spin particles exhibit a rich phenomenology and have signatures that often resemble the ones of supersymmetric and extra-dimensional theories. To enable further studies of higher-spin particles at collider and beyond, we collect the relevant Feynman rules and other technical details. |
hep-ph/0510086 | Imre Czovek | Imre Czovek | Color breaking in the quantum leaped stop decay | null | null | null | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The superfield propagator contains a measurable quantum leap, which comes
from the definition of SUSY. In the sfermion -> Goldstino + fermion vertex
change: 1. the spin of sparticle with discrete 1/2, 2. the Grassman superspace
with the Goldstino shift operator. 3. the spacetime as the result of extra
dimensional leap.
The leap nature of SUSY transformations appears in the squark decay, it is
the analog definition of SUSY. The quantum leaped outgoing propagators are
determined and break locally the energy and the charge. Like to the
teleportation the entangled pairs are here the b quark and the Goldstino. The
dominant stop production is from gluons. The stop-antistop pair decay to
quantum leaped b (c or t) quark, and the decay break the color. I get for the
(color breaking) quantum leap: 10^-18 m !!! And 10^-11 m color breaking would
be needed for a color breaking chain reaction. The open question is: Are the
colliders going to produce supersymmetry charge? Because some charges in QGP
can make long color breaking and a chain reaction.
A long color broken QGP state in the re-Big Bang theory could explain the
near infinite energy and the near infinite mass of the universe: - at first was
random color QGP in the flat space-time, - at twice the color restoration in
the curved space-time, which eats the Goldstinos, - and finally the baryon
genesis. The re Big Bang make a supernova like collapse and a flat explosion of
Universe.
This explanation of SUSY hides the Goldstone fermion in the extra dimensions,
the Goldstino propagate only in superspace and it is a not observable dark
matter.
PACS: 12.60.Jv
| [
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{
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"version": "v4"
},
{
"created": "Wed, 13 Dec 2006 15:29:15 GMT",
"version": "v5"
},
{
"created": "Tue, 9 Jan 2007 16:18:30 GMT",
"version": "v6"
},
{
"created": "Mon, 16 Apr 2007 16:05:33 GMT",
"version": "v7"
},
{
"created": "Mon, 1 Oct 2007 15:07:08 GMT",
"version": "v8"
},
{
"created": "Mon, 21 Jan 2008 17:48:41 GMT",
"version": "v9"
}
] | 2015-04-14 | [
[
"Czovek",
"Imre",
""
]
] | The superfield propagator contains a measurable quantum leap, which comes from the definition of SUSY. In the sfermion -> Goldstino + fermion vertex change: 1. the spin of sparticle with discrete 1/2, 2. the Grassman superspace with the Goldstino shift operator. 3. the spacetime as the result of extra dimensional leap. The leap nature of SUSY transformations appears in the squark decay, it is the analog definition of SUSY. The quantum leaped outgoing propagators are determined and break locally the energy and the charge. Like to the teleportation the entangled pairs are here the b quark and the Goldstino. The dominant stop production is from gluons. The stop-antistop pair decay to quantum leaped b (c or t) quark, and the decay break the color. I get for the (color breaking) quantum leap: 10^-18 m !!! And 10^-11 m color breaking would be needed for a color breaking chain reaction. The open question is: Are the colliders going to produce supersymmetry charge? Because some charges in QGP can make long color breaking and a chain reaction. A long color broken QGP state in the re-Big Bang theory could explain the near infinite energy and the near infinite mass of the universe: - at first was random color QGP in the flat space-time, - at twice the color restoration in the curved space-time, which eats the Goldstinos, - and finally the baryon genesis. The re Big Bang make a supernova like collapse and a flat explosion of Universe. This explanation of SUSY hides the Goldstone fermion in the extra dimensions, the Goldstino propagate only in superspace and it is a not observable dark matter. PACS: 12.60.Jv |
hep-ph/0205025 | Ernest Ma | Ernest Ma (UC Riverside) | Supersymmetric Higgs Triplets and Bilinear R-Parity Nonconservation | 5 pages, no figure | Mod.Phys.Lett. A17 (2002) 1259-1262 | 10.1142/S0217732302007363 | UCRHEP-T336 (May 2002) | hep-ph | null | The supersymmetric standard model of particle interactions is extended to
include two Higgs triplet superfields at the TeV scale, carrying two units of
lepton number. Realistic tree-level Majorana neutrino masses are obtained in
the presence of soft, i.e. bilinear, R-parity nonconservation.
| [
{
"created": "Thu, 2 May 2002 16:26:05 GMT",
"version": "v1"
}
] | 2009-11-07 | [
[
"Ma",
"Ernest",
"",
"UC Riverside"
]
] | The supersymmetric standard model of particle interactions is extended to include two Higgs triplet superfields at the TeV scale, carrying two units of lepton number. Realistic tree-level Majorana neutrino masses are obtained in the presence of soft, i.e. bilinear, R-parity nonconservation. |
hep-ph/0505202 | Olga Mena Requejo | Olga Mena and Stephen Parke | Physics Potential of the Fermilab NuMI beamline | 23 pages, 12 figures | Phys.Rev.D72:053003,2005 | 10.1103/PhysRevD.72.053003 | FERMILAB-PUB-05-196-T | hep-ph | null | We explore the physics potential of the NuMI beamline with a detector located
10 km off-axis at a distant site (810 km). We study the sensitivity to $\sin^2
2 \theta_{13}$ and to the CP-violating parameter $\sin \delta$ as well as the
determination of the neutrino mass hierarchy by exploiting the $\nu_\mu \to
\nu_e$ and $\bar{\nu}_\mu \to \bar{\nu}_e$ appearance channels. The results are
illustrated for three different experimental setups to quantify the benefits of
increased detector sizes, proton luminosities and $\nu_e$ detection
efficiencies.
| [
{
"created": "Mon, 23 May 2005 20:05:14 GMT",
"version": "v1"
},
{
"created": "Mon, 25 Jul 2005 19:53:41 GMT",
"version": "v2"
}
] | 2008-11-26 | [
[
"Mena",
"Olga",
""
],
[
"Parke",
"Stephen",
""
]
] | We explore the physics potential of the NuMI beamline with a detector located 10 km off-axis at a distant site (810 km). We study the sensitivity to $\sin^2 2 \theta_{13}$ and to the CP-violating parameter $\sin \delta$ as well as the determination of the neutrino mass hierarchy by exploiting the $\nu_\mu \to \nu_e$ and $\bar{\nu}_\mu \to \bar{\nu}_e$ appearance channels. The results are illustrated for three different experimental setups to quantify the benefits of increased detector sizes, proton luminosities and $\nu_e$ detection efficiencies. |
hep-ph/0605007 | Narendra Sahu | Narendra Sahu and Utpal Sarkar | Leptogenesis bound on neutrino masses in left-right symmetric models
with spontaneous D-parity violation | 32 pages (revtex), 12 eps figures, clarifications are added in
section VII, A new section VIII is added, useful references are added.
Journal version, To appear in Phys. Rev. D | Phys.Rev. D74 (2006) 093002 | 10.1103/PhysRevD.74.093002 | null | hep-ph | null | We study the baryogenesis via leptogenesis in a class of left-right symmetric
models, in which $D$-parity is broken spontaneously. We first discuss the
consequence of the spontaneous $D$-parity breaking on the neutrino masses. Than
we study the lepton asymmetry in various cases, from the decay of right handed
neutrino as well as the triplet Higgs, depending on their relative masses they
acquire from the symmetry breaking pattern. The leptogenesis bound on their
masses are discussed by taking into account the low energy neutrino oscillation
data. It is shown that a TeV scale leptogenesis is viable if there are
additional sources of CP violation like domain wall originating from the
spontaneous $D$-parity violation.
| [
{
"created": "Sun, 30 Apr 2006 07:58:04 GMT",
"version": "v1"
},
{
"created": "Fri, 12 May 2006 19:51:43 GMT",
"version": "v2"
},
{
"created": "Sun, 22 Oct 2006 14:28:23 GMT",
"version": "v3"
}
] | 2009-11-11 | [
[
"Sahu",
"Narendra",
""
],
[
"Sarkar",
"Utpal",
""
]
] | We study the baryogenesis via leptogenesis in a class of left-right symmetric models, in which $D$-parity is broken spontaneously. We first discuss the consequence of the spontaneous $D$-parity breaking on the neutrino masses. Than we study the lepton asymmetry in various cases, from the decay of right handed neutrino as well as the triplet Higgs, depending on their relative masses they acquire from the symmetry breaking pattern. The leptogenesis bound on their masses are discussed by taking into account the low energy neutrino oscillation data. It is shown that a TeV scale leptogenesis is viable if there are additional sources of CP violation like domain wall originating from the spontaneous $D$-parity violation. |
2211.08443 | Bhavesh Chauhan | Bhavesh Chauhan | Using supernova neutrinos to probe strange spin of proton with JUNO and
THEIA | 9 pages, 4 figures; comments are welcome | null | null | null | hep-ph | http://creativecommons.org/licenses/by/4.0/ | The strange quark contribution to proton's spin ($\Delta s$) is a fundamental
quantity that is poorly determined from current experiments. Neutrino-proton
elastic scattering (pES) is a promising channel to measure this quantity, and
requires an intense source of low-energy neutrinos and a low-threshold detector
with excellent resolution. In this paper, we propose that neutrinos from a
galactic supernova and their interactions with protons in large-volume
scintillation detectors can be utilized to determine $\Delta s$. The spectra of
all flavors of supernova neutrinos can be independently determined using a
combination of DUNE and Super-(Hyper-)Kamiokande. This allows us to predict pES
event rates in JUNO and THEIA, and estimate $\Delta s$ by comparing with
detected events. We find that the projected sensitivity for a supernova at 1
kpc (10 kpc), is approximately $\pm 0.01$ ($\pm 0.15$). Interestingly, the
limits from a nearby supernova would be comparable to the results from lattice
QCD, and better than polarized deep-inelastic scattering experiments. Using
supernova neutrinos provides a true $Q^2\rightarrow 0$ measurement, and thus an
axial-mass independent determination of $\Delta s$.
| [
{
"created": "Tue, 15 Nov 2022 19:00:03 GMT",
"version": "v1"
}
] | 2022-11-17 | [
[
"Chauhan",
"Bhavesh",
""
]
] | The strange quark contribution to proton's spin ($\Delta s$) is a fundamental quantity that is poorly determined from current experiments. Neutrino-proton elastic scattering (pES) is a promising channel to measure this quantity, and requires an intense source of low-energy neutrinos and a low-threshold detector with excellent resolution. In this paper, we propose that neutrinos from a galactic supernova and their interactions with protons in large-volume scintillation detectors can be utilized to determine $\Delta s$. The spectra of all flavors of supernova neutrinos can be independently determined using a combination of DUNE and Super-(Hyper-)Kamiokande. This allows us to predict pES event rates in JUNO and THEIA, and estimate $\Delta s$ by comparing with detected events. We find that the projected sensitivity for a supernova at 1 kpc (10 kpc), is approximately $\pm 0.01$ ($\pm 0.15$). Interestingly, the limits from a nearby supernova would be comparable to the results from lattice QCD, and better than polarized deep-inelastic scattering experiments. Using supernova neutrinos provides a true $Q^2\rightarrow 0$ measurement, and thus an axial-mass independent determination of $\Delta s$. |
hep-ph/9801454 | null | Pran Nath and R. Arnowitt | Accurate Cosmological Parmeters and Supersymmetric Particle Properties | RevTeX 10 pages, 4 figures | Mod.Phys.Lett.A13:2239-2246,1998 | 10.1142/S0217732398002394 | null | hep-ph astro-ph | null | Future sattelite, balloon and ground based experiments will give precision
determinations of the basic cosmological parameters and hence determine the
amount of cold dark matter accurately. We consider here two cosmological
models, the nuCDM model and the LambdaCDM model, and examine within the
framework of supergravity grand unification the effect this will have for these
models on supersymmetry searches at accelerators. In the former example the
gluino (neutralino) mass has an upper bound of about 720(100) GeV and gaps
(forbidden regions) may deveop at lower energies. In the latter case the upper
bound occurs at gluino (neutralino) mass of about 520(70) GeV with squarks and
selectron becoming light when gluino (neutralino) masses are greater than
420(55) GeV. Both models are sensitive to non-universal soft breaking masses,
and show a correlation between large (small) dark matter detector rates and low
(high) b -> s+ gamma branching ratio.
| [
{
"created": "Fri, 30 Jan 1998 16:32:26 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Nath",
"Pran",
""
],
[
"Arnowitt",
"R.",
""
]
] | Future sattelite, balloon and ground based experiments will give precision determinations of the basic cosmological parameters and hence determine the amount of cold dark matter accurately. We consider here two cosmological models, the nuCDM model and the LambdaCDM model, and examine within the framework of supergravity grand unification the effect this will have for these models on supersymmetry searches at accelerators. In the former example the gluino (neutralino) mass has an upper bound of about 720(100) GeV and gaps (forbidden regions) may deveop at lower energies. In the latter case the upper bound occurs at gluino (neutralino) mass of about 520(70) GeV with squarks and selectron becoming light when gluino (neutralino) masses are greater than 420(55) GeV. Both models are sensitive to non-universal soft breaking masses, and show a correlation between large (small) dark matter detector rates and low (high) b -> s+ gamma branching ratio. |
1808.05706 | Fazlollah Hajkarim | Manuel Drees, Fazlollah Hajkarim | Neutralino Dark Matter in Scenarios with Early Matter Domination | 27 pages, 6 figures, updated references, minor modifications, as
published | JHEP 1812 (2018) 042 | 10.1007/JHEP12(2018)042 | null | hep-ph astro-ph.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We investigate the production of neutralino dark matter in a cosmological
scenario featuring an early matter dominated era ending at a relatively low
reheating temperature. In such scenarios different production mechanisms of
weakly interacting massive particles (WIMPs), besides the well--studied thermal
production, can be important. This opens up new regions of parameter space
where the lightest neutralino, as the best--known supersymmetric (SUSY) WIMP,
obtains the required relic abundance. Many of these new sets of parameters are
also compatible with current limits from colliders as well as direct and
indirect WIMP searches. In particular, in standard cosmology bino--like
neutralinos, which emerge naturally as lightest neutralino in many models, can
have the desired relic density only in some finetuned regions of parameter
space where the effective annihilation cross section is enhanced by
co--annihilation or an $s-$channel pole. In contrast, if the energy density of
the universe was dominated by long--lived PeV--scale particles (e.g. moduli or
Polonyi fields), bino--like neutralinos can obtain the required relic density
over wide regions of supersymmetric parameter space. We identify the
interesting ranges of mass and decay properties of the heavy long--lived
particles, carefully treating the evolution of the temperature of the thermal
background.
| [
{
"created": "Thu, 16 Aug 2018 23:49:25 GMT",
"version": "v1"
},
{
"created": "Sun, 16 Dec 2018 17:52:20 GMT",
"version": "v2"
}
] | 2018-12-18 | [
[
"Drees",
"Manuel",
""
],
[
"Hajkarim",
"Fazlollah",
""
]
] | We investigate the production of neutralino dark matter in a cosmological scenario featuring an early matter dominated era ending at a relatively low reheating temperature. In such scenarios different production mechanisms of weakly interacting massive particles (WIMPs), besides the well--studied thermal production, can be important. This opens up new regions of parameter space where the lightest neutralino, as the best--known supersymmetric (SUSY) WIMP, obtains the required relic abundance. Many of these new sets of parameters are also compatible with current limits from colliders as well as direct and indirect WIMP searches. In particular, in standard cosmology bino--like neutralinos, which emerge naturally as lightest neutralino in many models, can have the desired relic density only in some finetuned regions of parameter space where the effective annihilation cross section is enhanced by co--annihilation or an $s-$channel pole. In contrast, if the energy density of the universe was dominated by long--lived PeV--scale particles (e.g. moduli or Polonyi fields), bino--like neutralinos can obtain the required relic density over wide regions of supersymmetric parameter space. We identify the interesting ranges of mass and decay properties of the heavy long--lived particles, carefully treating the evolution of the temperature of the thermal background. |
2307.04450 | Alessandro Pilloni | T. Alghamdi, Y. Alanazi, M. Battaglieri, L. Bibrzycki, A. V. Golda, A.
N. Hiller Blin, E. L. Isupov, Y. Li, L. Marsicano, W. Melnitchouk, V. I.
Mokeev, G. Montana, A. Pilloni, N. Sato, A. P. Szczepaniak, and T. Vittorini | Toward a generative modeling analysis of CLAS exclusive $2\pi$
photoproduction | 14 pages, 20 figures | null | null | JLAB-THY-23-3881 | hep-ph hep-ex nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | AI-supported algorithms, particularly generative models, have been
successfully used in a variety of different contexts. In this work, we
demonstrate for the first time that generative adversarial networks (GANs) can
be used in high-energy experimental physics to unfold detector effects from
multi-particle final states, while preserving correlations between kinematic
variables in multidimensional phase space. We perform a full closure test on
two-pion photoproduction pseudodata generated with a realistic model in the
kinematics of the Jefferson Lab CLAS g11 experiment. The overlap of different
reaction mechanisms leading to the same final state associated with the CLAS
detector's nontrivial effects represents an ideal test case for AI-supported
analysis. Uncertainty quantification performed via bootstrap provides an
estimate of the systematic uncertainty associated with the procedure. The test
demonstrates that GANs can reproduce highly correlated multidifferential cross
sections even in the presence of detector-induced distortions in the training
datasets, and provides a solid basis for applying the framework to real
experimental data.
| [
{
"created": "Mon, 10 Jul 2023 10:00:15 GMT",
"version": "v1"
}
] | 2023-07-11 | [
[
"Alghamdi",
"T.",
""
],
[
"Alanazi",
"Y.",
""
],
[
"Battaglieri",
"M.",
""
],
[
"Bibrzycki",
"L.",
""
],
[
"Golda",
"A. V.",
""
],
[
"Blin",
"A. N. Hiller",
""
],
[
"Isupov",
"E. L.",
""
],
[
"Li",
"Y.",
""
],
[
"Marsicano",
"L.",
""
],
[
"Melnitchouk",
"W.",
""
],
[
"Mokeev",
"V. I.",
""
],
[
"Montana",
"G.",
""
],
[
"Pilloni",
"A.",
""
],
[
"Sato",
"N.",
""
],
[
"Szczepaniak",
"A. P.",
""
],
[
"Vittorini",
"T.",
""
]
] | AI-supported algorithms, particularly generative models, have been successfully used in a variety of different contexts. In this work, we demonstrate for the first time that generative adversarial networks (GANs) can be used in high-energy experimental physics to unfold detector effects from multi-particle final states, while preserving correlations between kinematic variables in multidimensional phase space. We perform a full closure test on two-pion photoproduction pseudodata generated with a realistic model in the kinematics of the Jefferson Lab CLAS g11 experiment. The overlap of different reaction mechanisms leading to the same final state associated with the CLAS detector's nontrivial effects represents an ideal test case for AI-supported analysis. Uncertainty quantification performed via bootstrap provides an estimate of the systematic uncertainty associated with the procedure. The test demonstrates that GANs can reproduce highly correlated multidifferential cross sections even in the presence of detector-induced distortions in the training datasets, and provides a solid basis for applying the framework to real experimental data. |
2403.05637 | Nicol\'as P\'erez | A. E. C\'arcamo Hern\'andez, Yocelyne Hidalgo Vel\'asquez, Sergey
Kovalenko, Nicol\'as A. P\'erez-Julve, Ivan Schmidt | Models of radiative linear seesaw with electrically charged mediators | 25 pages, v2 contains enlarged discussion | null | null | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We propose two versions of radiative linear seesaw models, where electrically
charged scalars and vector-like leptons generate the Dirac neutrino mass
submatrix at one and two loop levels. In these models, the SM charged lepton
masses are generated from a one loop level radiative seesaw mechanism mediated
by charged exotic vector-like leptons and electrically neutral scalars running
in the loops. These models can successfully accommodate the current amount of
dark matter and baryon asymmetries observed in the Universe, as well as the
muon anomalous magnetic moment.
| [
{
"created": "Fri, 8 Mar 2024 19:18:54 GMT",
"version": "v1"
},
{
"created": "Mon, 29 Jul 2024 19:29:01 GMT",
"version": "v2"
}
] | 2024-07-31 | [
[
"Hernández",
"A. E. Cárcamo",
""
],
[
"Velásquez",
"Yocelyne Hidalgo",
""
],
[
"Kovalenko",
"Sergey",
""
],
[
"Pérez-Julve",
"Nicolás A.",
""
],
[
"Schmidt",
"Ivan",
""
]
] | We propose two versions of radiative linear seesaw models, where electrically charged scalars and vector-like leptons generate the Dirac neutrino mass submatrix at one and two loop levels. In these models, the SM charged lepton masses are generated from a one loop level radiative seesaw mechanism mediated by charged exotic vector-like leptons and electrically neutral scalars running in the loops. These models can successfully accommodate the current amount of dark matter and baryon asymmetries observed in the Universe, as well as the muon anomalous magnetic moment. |
0810.4954 | Antonio Bouzas | Antonio O. Bouzas | Absorptive part of meson--baryon scattering amplitude and baryon
polarization in chiral perturbation theory | null | Int.J.Mod.Phys.E17:1477-1497,2008 | 10.1142/S0218301308010544 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We compute the spin asymmetry and polarization of the final-state baryon in
its rest frame in two-body meson--baryon low-energy scattering with unpolarized
initial state, to lowest non-trivial order in BChPT. The required absorptive
amplitudes are obtained analytically at one-loop level. We discuss the
polarization results numerically for several meson--baryon processes. Even at
low energies above threshold, where BChPT can reasonably be expected to be
applicable, sizable values of polarization are found for some processes.
| [
{
"created": "Mon, 27 Oct 2008 23:44:02 GMT",
"version": "v1"
}
] | 2010-04-21 | [
[
"Bouzas",
"Antonio O.",
""
]
] | We compute the spin asymmetry and polarization of the final-state baryon in its rest frame in two-body meson--baryon low-energy scattering with unpolarized initial state, to lowest non-trivial order in BChPT. The required absorptive amplitudes are obtained analytically at one-loop level. We discuss the polarization results numerically for several meson--baryon processes. Even at low energies above threshold, where BChPT can reasonably be expected to be applicable, sizable values of polarization are found for some processes. |
hep-ph/0210224 | Z. Hioki | Zenro Hioki (Univ. Tokushima, Japan) | A New Decoupling Theorem in Top-Quark Physics | 7 pages, Latex, one eps-figure, Talk at International Workshop on
Physics and Experiments with Future Electron-Positron Linear Colliders
(LCWS2002), August 26 - 30, 2002, Jeju-island, Korea | null | null | null | hep-ph hep-ex | null | Angular distribution of a secondary particle in top-quark production/decay is
studied in a simple and general manner. It is shown that the distribution does
not depend on any possible anomalous top-quark-decay interactions whatever the
production mechanism is when certain well-justified conditions are satisfied.
Some analyses using the final- state lepton are presented as an example of its
application.
| [
{
"created": "Wed, 16 Oct 2002 06:39:52 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Hioki",
"Zenro",
"",
"Univ. Tokushima, Japan"
]
] | Angular distribution of a secondary particle in top-quark production/decay is studied in a simple and general manner. It is shown that the distribution does not depend on any possible anomalous top-quark-decay interactions whatever the production mechanism is when certain well-justified conditions are satisfied. Some analyses using the final- state lepton are presented as an example of its application. |
0809.2515 | Brigitte Hiller | B. Hiller, A. A. Osipov, J. Moreira, A. H. Blin | Impact of eight quark interactions on chiral phase transitions II:
Thermal effects | 3 pages, prepared for XIII International Conference on Selected
Problems of Modern Theoretical Physics (SPMTP08), Bogoliubov Laboratory of
Theoretical Physics, Dubna, Russia, June 23-27, 2008 | Proceedings of the XIII International Conference on Selected
Problems of Modern Physics, dedicated to the 100th anniversary of the birth
of D.I. Blokhintsev, Dubna, June 23-27 (2008), ISBN 978-5-9530-0207-3, JINR
2009, p.189 | null | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this talk attention is drawn to thermal properties due to the addition of
eight quark interactions in the standard $SU(3)\times SU(3)$ chiral
Nambu-Jona-Lasinio model (NJL) with 't Hooft interaction (NJLH). The schematic
SU(3) flavor limit with massless current quarks as well as the realistic case
$m_u=m_d\ne m_s$ are discussed.
| [
{
"created": "Mon, 15 Sep 2008 13:11:34 GMT",
"version": "v1"
}
] | 2009-10-14 | [
[
"Hiller",
"B.",
""
],
[
"Osipov",
"A. A.",
""
],
[
"Moreira",
"J.",
""
],
[
"Blin",
"A. H.",
""
]
] | In this talk attention is drawn to thermal properties due to the addition of eight quark interactions in the standard $SU(3)\times SU(3)$ chiral Nambu-Jona-Lasinio model (NJL) with 't Hooft interaction (NJLH). The schematic SU(3) flavor limit with massless current quarks as well as the realistic case $m_u=m_d\ne m_s$ are discussed. |
2002.07110 | Digesh Raut | Nobuchika Okada, Digesh Raut and Qaisar Shafi | SMART U(1)$_X$ $-$ Standard Model with Axion, Right handed neutrinos,
Two Higgs doublets and U(1)$_X$ gauge symmetry | 18 pages, 2 figures | null | 10.1140/epjc/s10052-020-8343-6 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | To address five fundamental shortcomings of the Standard Model (SM) of
particle physics and cosmology, we propose a SMART U(1)$_X$ model which is a
$U(1)_X \times U(1)_{PQ}$ extension of the SM. The $U(1)_X$ gauge symmetry is a
generalization of the well-known $U(1)_{B-L}$ symmetry and $U(1)_{PQ}$ is the
global Peccie-Quinn (PQ) symmetry. Three right handed neutrinos are added to
cancel $U(1)_X$ related anomalies, and they play a crucial role in
understanding the observed neutrino oscillations and explaining the observed
baryon asymmetry in the universe via leptogenesis. The PQ symmetry helps
resolve the strong CP problem and also provides axion as a compelling dark
matter (DM) candidate. The $U(1)_X$ gauge symmetry enables us to implement the
inflection-point inflation scenario with $H_{inf} \lesssim 2 \times 10^{7}$
GeV, where $H_{inf}$ is the value of Hubble parameter during inflation. This
allows us to overcome a potential axion domain wall problem as well as the
axion isocurvature problem. The SMART U(1)$_X$ model can be merged with $SU(5)$
as we briefly show.
| [
{
"created": "Mon, 17 Feb 2020 18:04:02 GMT",
"version": "v1"
}
] | 2020-12-02 | [
[
"Okada",
"Nobuchika",
""
],
[
"Raut",
"Digesh",
""
],
[
"Shafi",
"Qaisar",
""
]
] | To address five fundamental shortcomings of the Standard Model (SM) of particle physics and cosmology, we propose a SMART U(1)$_X$ model which is a $U(1)_X \times U(1)_{PQ}$ extension of the SM. The $U(1)_X$ gauge symmetry is a generalization of the well-known $U(1)_{B-L}$ symmetry and $U(1)_{PQ}$ is the global Peccie-Quinn (PQ) symmetry. Three right handed neutrinos are added to cancel $U(1)_X$ related anomalies, and they play a crucial role in understanding the observed neutrino oscillations and explaining the observed baryon asymmetry in the universe via leptogenesis. The PQ symmetry helps resolve the strong CP problem and also provides axion as a compelling dark matter (DM) candidate. The $U(1)_X$ gauge symmetry enables us to implement the inflection-point inflation scenario with $H_{inf} \lesssim 2 \times 10^{7}$ GeV, where $H_{inf}$ is the value of Hubble parameter during inflation. This allows us to overcome a potential axion domain wall problem as well as the axion isocurvature problem. The SMART U(1)$_X$ model can be merged with $SU(5)$ as we briefly show. |
1404.6119 | Vien Vo Van | V. V. Vien and H.N.Long | Neutrino mass and mixing in the 3-3-1 model and S3 flavor symmetry with
minimal Higgs content | 31 pages, 3 figures. arXiv admin note: text overlap with
arXiv:1111.6360 | Zh. Eksp. Teor. Fiz. 145, No. 6 (2014), pp. 991 -1009; J. Exp.
Theor. Phys. 118, No.6 (2014), pp. 869 -890 | 10.7868/S0044451014060044;10.1134/S1063776114050173 | null | hep-ph | http://creativecommons.org/licenses/publicdomain/ | A new S3 flavor model based on $\mathrm{SU}(3)_C \otimes \mathrm{SU}(3)_L
\otimes \mathrm{U}(1)_X$ gauge symmetry responsible for fermion masses and
mixings different from our previous work is constructed.
The new feature is a two - dimensional representation of a Higgs anti-sextet
under $S_3$ which responsible for neutrino masses and mixings. The neutrinos
acquire small masses from only an anti-sextet of $\mathrm{SU(3)}$ which is in a
doublet under $S_3$. If the difference of components of the anti-sextet is
regarded as a small perturbation, S3 is equivalently broken into identity, the
corresponding neutrino mass mixing matrix acquires the most general form and
the model can fit the latest data on neutrino oscillation. This way of the
symmetry breaking helps us to reduce a content in the Higgs sector, only one an
anti-sextet instead of two as in our previous work. Our results show that the
neutrino masses are naturally small and a small deviation from the
tri-bimaximal neutrino mixing form can be realized. The Higgs potential of the
model as well as the minimization conditions and gauge boson masses and mixings
is also considered.
| [
{
"created": "Thu, 24 Apr 2014 13:35:50 GMT",
"version": "v1"
},
{
"created": "Thu, 10 Jul 2014 13:46:06 GMT",
"version": "v2"
}
] | 2014-07-11 | [
[
"Vien",
"V. V.",
""
],
[
"Long",
"H. N.",
""
]
] | A new S3 flavor model based on $\mathrm{SU}(3)_C \otimes \mathrm{SU}(3)_L \otimes \mathrm{U}(1)_X$ gauge symmetry responsible for fermion masses and mixings different from our previous work is constructed. The new feature is a two - dimensional representation of a Higgs anti-sextet under $S_3$ which responsible for neutrino masses and mixings. The neutrinos acquire small masses from only an anti-sextet of $\mathrm{SU(3)}$ which is in a doublet under $S_3$. If the difference of components of the anti-sextet is regarded as a small perturbation, S3 is equivalently broken into identity, the corresponding neutrino mass mixing matrix acquires the most general form and the model can fit the latest data on neutrino oscillation. This way of the symmetry breaking helps us to reduce a content in the Higgs sector, only one an anti-sextet instead of two as in our previous work. Our results show that the neutrino masses are naturally small and a small deviation from the tri-bimaximal neutrino mixing form can be realized. The Higgs potential of the model as well as the minimization conditions and gauge boson masses and mixings is also considered. |
1706.03971 | Maximilian Stahlhofen | Clara Peset, Antonio Pineda, Maximilian Stahlhofen | Relativistic corrections to the static energy in terms of Wilson loops
at weak coupling | 32 pages, 12 figures; v2: journal version | Eur. Phys. J. C (2017) 77:681 | 10.1140/epjc/s10052-017-5250-6 | MITP/17-041 | hep-ph hep-lat hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We consider the ${\mathcal O}(1/m)$ and the spin-independent
momentum-dependent ${\mathcal O}(1/m^2)$ quasi-static energies of heavy
quarkonium (with unequal masses). They are defined nonperturbatively in terms
of Wilson loops. We determine their short-distance behavior through ${\mathcal
O}(\alpha^3)$ and ${\mathcal O}(\alpha^2)$, respectively. In particular, we
calculate the ultrasoft contributions to the quasi-static energies, which
requires the resummation of potential interactions. Our results can be directly
compared to lattice simulations. In addition, we also compare the available
lattice data with the expectations from effective string models for the
long-distance behavior of the quasi-static energies.
| [
{
"created": "Tue, 13 Jun 2017 09:40:55 GMT",
"version": "v1"
},
{
"created": "Tue, 17 Oct 2017 14:55:03 GMT",
"version": "v2"
}
] | 2017-10-18 | [
[
"Peset",
"Clara",
""
],
[
"Pineda",
"Antonio",
""
],
[
"Stahlhofen",
"Maximilian",
""
]
] | We consider the ${\mathcal O}(1/m)$ and the spin-independent momentum-dependent ${\mathcal O}(1/m^2)$ quasi-static energies of heavy quarkonium (with unequal masses). They are defined nonperturbatively in terms of Wilson loops. We determine their short-distance behavior through ${\mathcal O}(\alpha^3)$ and ${\mathcal O}(\alpha^2)$, respectively. In particular, we calculate the ultrasoft contributions to the quasi-static energies, which requires the resummation of potential interactions. Our results can be directly compared to lattice simulations. In addition, we also compare the available lattice data with the expectations from effective string models for the long-distance behavior of the quasi-static energies. |
hep-ph/0506124 | Alexandr Berezhnoy | A. V. Berezhnoy, A. K. Likhoded | Charge asymmetry in the photonic production of charmed mesons | 15 pages, 6 figures, ReVTeX, submitted to Phys. Atom. Nucl. in
February 2005 | Phys.Atom.Nucl. 69 (2006) 103-112; Yad.Fiz. 69 (2006) 107-116 | 10.1134/S1063778806010145 | null | hep-ph | null | Charge asymmetries for the charm meson production ($D^{*+}$--$D^{*-}$,
$D^{*0}$--$\bar D^{*0}$ and $D^+_s$--$\bar D^-_s$) have been estimated for the
COMPASS kinematic conditions in the framework of perturbative recombination
model. Mass corrections have been taken into account in the calculations. The
large asymmetry for $D^+_s$--$\bar D^-_s$ production has been predicted.
| [
{
"created": "Mon, 13 Jun 2005 16:49:56 GMT",
"version": "v1"
}
] | 2015-06-25 | [
[
"Berezhnoy",
"A. V.",
""
],
[
"Likhoded",
"A. K.",
""
]
] | Charge asymmetries for the charm meson production ($D^{*+}$--$D^{*-}$, $D^{*0}$--$\bar D^{*0}$ and $D^+_s$--$\bar D^-_s$) have been estimated for the COMPASS kinematic conditions in the framework of perturbative recombination model. Mass corrections have been taken into account in the calculations. The large asymmetry for $D^+_s$--$\bar D^-_s$ production has been predicted. |
hep-ph/9307357 | Marek Jezabek | M.Je\.zabek and C. J\"unger | Energy of W distribution in top quark decays | Karlsruhe Univ. preprint TTP 93-20, 8p., 2 figures not included | Acta Phys.Polon. B24 (1993) 1923-1930 | null | null | hep-ph | null | A relatively simple analytical formula is derived for the energy spectrum of
$W$ boson in top quark decays $t\to Wb$ including ${\cal O}(\alpha_s)$
radiative corrections. We discuss the accuracy of this formula and compare it
to a more general albeit more complicated one derived in \cite{CJK}~. A Monte
Carlo algorithm for generation of $W$ energy spectrum is briefly described.
| [
{
"created": "Wed, 28 Jul 1993 23:25:00 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Jeżabek",
"M.",
""
],
[
"Jünger",
"C.",
""
]
] | A relatively simple analytical formula is derived for the energy spectrum of $W$ boson in top quark decays $t\to Wb$ including ${\cal O}(\alpha_s)$ radiative corrections. We discuss the accuracy of this formula and compare it to a more general albeit more complicated one derived in \cite{CJK}~. A Monte Carlo algorithm for generation of $W$ energy spectrum is briefly described. |
1307.4341 | Chong Sheng Li | Ze Long Liu, Chong Sheng Li, Yan Wang, Yong Chuan Zhan, Hai Tao Li | Transverse momentum resummation for color sextet and antitriplet scalar
production at the LHC | 20 pages, 7 figures | Eur. Phys. J. C, 74 2 (2014) 2771 | 10.1140/epjc/s10052-014-2771-0 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the factorization and resummation of the transverse momentum
spectrum of the color sextet and antitriplet scalars produced at the LHC based
on soft-collinear effective theory. Compared to Z boson and Higgs production, a
soft function is required to account for the soft gluon emission from the
final-state colored scalar. The soft function is calculated at the
next-to-leading order, and the resummation is performed at the approximate
next-to-next-to-leading logarithmic accuracy. The non-perturbative effects and
PDF uncertainties are also discussed.
| [
{
"created": "Tue, 16 Jul 2013 17:01:36 GMT",
"version": "v1"
},
{
"created": "Mon, 3 Mar 2014 08:44:51 GMT",
"version": "v2"
}
] | 2014-03-04 | [
[
"Liu",
"Ze Long",
""
],
[
"Li",
"Chong Sheng",
""
],
[
"Wang",
"Yan",
""
],
[
"Zhan",
"Yong Chuan",
""
],
[
"Li",
"Hai Tao",
""
]
] | We study the factorization and resummation of the transverse momentum spectrum of the color sextet and antitriplet scalars produced at the LHC based on soft-collinear effective theory. Compared to Z boson and Higgs production, a soft function is required to account for the soft gluon emission from the final-state colored scalar. The soft function is calculated at the next-to-leading order, and the resummation is performed at the approximate next-to-next-to-leading logarithmic accuracy. The non-perturbative effects and PDF uncertainties are also discussed. |
hep-ph/9410216 | Ngee-Pong Chang | Ngee Pong Chang | Chiral Restoration in the Early Universe: Pion Halo in the Sky | 4 pages, LaTeX, CCNY-HEP-94-9 To appear in Proceedings of "Trends in
Astroparticle Physics Workshop", Stockholm, Sweden, 22-25 September, 1994,
Nuclear Physics B, Proceedings Supplement, edited by L. Bergstrom, P.
Carlson, P.O. Hulth, and H. Snellman. (Only revision is in the header
citation) | null | null | null | hep-ph | null | < \psibarpsi > vanishing above $T_c$ indicates chiral symmetry restoration at
high $T$. But is it the old $T=0$ chiral symmetry that is `restored'? In this
talk, I report on the spacetime quantization of the BPFTW effective action for
quarks in a hot environ. The fermion propagator is known to give a
pseudo-Lorentz invariant particle pole as well as new spacelike cuts. Our
quantization shows that the spacelike cuts directly lead to a thermal vacuum
that is a generalized NJL state, with a curious $90^{o}$ phase. This $90^{o}$
is responsible for < \psibarpsi > vanishing at high $T$. The thermal vacuum is
invariant under a new chiral charge, but continues to break the old zero
temperature chirality. Our quantization suggests a new class of order
parameters that probe the physics of these spacelike cuts. In usual scenario,
the pion dissociates in the early alphabet soup. With this new understanding of
the thermal vacuum, the pion remains a Nambu-Goldstone particle at high $T$,
and will not dissociate. It propagates at the speed of light but with a halo.
| [
{
"created": "Tue, 4 Oct 1994 20:07:42 GMT",
"version": "v1"
},
{
"created": "Wed, 5 Oct 1994 13:55:38 GMT",
"version": "v2"
},
{
"created": "Thu, 13 Oct 1994 01:18:37 GMT",
"version": "v3"
}
] | 2008-02-03 | [
[
"Chang",
"Ngee Pong",
""
]
] | < \psibarpsi > vanishing above $T_c$ indicates chiral symmetry restoration at high $T$. But is it the old $T=0$ chiral symmetry that is `restored'? In this talk, I report on the spacetime quantization of the BPFTW effective action for quarks in a hot environ. The fermion propagator is known to give a pseudo-Lorentz invariant particle pole as well as new spacelike cuts. Our quantization shows that the spacelike cuts directly lead to a thermal vacuum that is a generalized NJL state, with a curious $90^{o}$ phase. This $90^{o}$ is responsible for < \psibarpsi > vanishing at high $T$. The thermal vacuum is invariant under a new chiral charge, but continues to break the old zero temperature chirality. Our quantization suggests a new class of order parameters that probe the physics of these spacelike cuts. In usual scenario, the pion dissociates in the early alphabet soup. With this new understanding of the thermal vacuum, the pion remains a Nambu-Goldstone particle at high $T$, and will not dissociate. It propagates at the speed of light but with a halo. |
hep-ph/9604323 | Bernd Schlei | U. Ornik, M. Pl\"umer, B.R. Schlei, D. Strottman and R.M. Weiner | Hydrodynamical analysis of symmetric nucleus-nucleus collisions at
CERN/SPS energies | 21 pages, 11 Postscript figures (1 File, 775654 Bytes, has to be
requested for submission via e.mail from schlei@t2.lanl.gov) | Phys.Rev.C54:1381-1389,1996 | 10.1103/PhysRevC.54.1381 | LAUR-96-1298 | hep-ph | null | We present a coherent theoretical study of ultrarelativistic heavy-ion data
obtained at the CERN/SPS by the NA35/NA49 Collaborations using 3+1-dimensional
relativistic hydrodynamics. We find excellent agreement with the rapidity
spectra of negative hadrons and protons and with the correlation measurements
in two experiments: $S+S$ at 200 $AGeV$ and $Pb+Pb$ at 160 $AGeV$ (preliminary
results). Within our model this implies that for $Pb+Pb$ ($S+S$) a
quark-gluon-plasma of initial volume 174 $fm^3$ (24 $fm^3$) with a lifetime 3.4
$fm/c$ (1.5 $fm/c$) was formed. It is found that the Bose-Einstein correlation
measurements do not determine the maximal effective radii of the hadron sources
because of the large contributions from resonance decay at small momenta. Also
within this study we present an NA49 acceptance corrected two-pion
Bose-Einstein correlation function in the invariant variable, $Q_{inv}$.
| [
{
"created": "Mon, 15 Apr 1996 17:46:56 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Ornik",
"U.",
""
],
[
"Plümer",
"M.",
""
],
[
"Schlei",
"B. R.",
""
],
[
"Strottman",
"D.",
""
],
[
"Weiner",
"R. M.",
""
]
] | We present a coherent theoretical study of ultrarelativistic heavy-ion data obtained at the CERN/SPS by the NA35/NA49 Collaborations using 3+1-dimensional relativistic hydrodynamics. We find excellent agreement with the rapidity spectra of negative hadrons and protons and with the correlation measurements in two experiments: $S+S$ at 200 $AGeV$ and $Pb+Pb$ at 160 $AGeV$ (preliminary results). Within our model this implies that for $Pb+Pb$ ($S+S$) a quark-gluon-plasma of initial volume 174 $fm^3$ (24 $fm^3$) with a lifetime 3.4 $fm/c$ (1.5 $fm/c$) was formed. It is found that the Bose-Einstein correlation measurements do not determine the maximal effective radii of the hadron sources because of the large contributions from resonance decay at small momenta. Also within this study we present an NA49 acceptance corrected two-pion Bose-Einstein correlation function in the invariant variable, $Q_{inv}$. |
1702.01329 | David d'Enterria | David d'Enterria, Peter Z. Skands, D. Anderle, F. Anulli, J. Aparisi,
G. Bell, V. Bertone, C. Bierlich, S. Carrazza, G. Corcella, D. d'Enterria, M.
Dasgupta, I. Garcia, T. Gehrmann, O. Gituliar, K. Hamacher, N.P. Hartland,
A.H. Hoang, A. Hornig, S. Jadach, T. Kaufmann, S. Kluth, D.W. Kolodrubetz, A.
Kusina, C. Lee, G. Luisoni, V. Mateu, H. Matevosyan, W. Metzger, S.O. Moch,
P.F. Monni, B. Nachman, E.R. Nocera, M. Perell\'o, W. Placzek, S. Pl\"atzer,
R. Perez-Ramos, G. Rauco, P. Richardson, F. Ringer, J. Rojo, Ph. Roloff, Y.
Sakaki, N. Sato, R. Simoniello, T. Sj\"ostrand, P.Z. Skands, M. Skrzypek, G.
Soyez, I.W. Stewart, M. Stratmann, J. Talbert, S. Todorova, S. Tokar, M. Vos,
A. Vossen | Parton Radiation and Fragmentation from LHC to FCC-ee | 181 pages, 120 figures. Proceedings "Parton Radiation and
Fragmentation from LHC to FCC-ee" Workshop (CERN, Nov. 2016), David
d'Enterria, Peter Z. Skands (eds.) | null | null | CoEPP-MN-17-1 | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | This document collects the proceedings of the "Parton Radiation and
Fragmentation from LHC to FCC-ee" workshop (http://indico.cern.ch/e/ee\_jets16)
held at CERN in Nov. 2016. The writeup reviews the latest theoretical and
experimental developments on parton radiation and parton-hadron fragmentation
studies --including analyses of LEP, B-factories, and LHC data-- with a focus
on the future perspectives reacheable in $e^+e^-$ measurements at the Future
Circular Collider (FCC-ee), with multi-ab$^{-1}$ integrated luminosities
yielding 10$^{12}$ and 10$^{8}$ jets from Z and W bosons decays as well as
10$^5$ gluon jets from Higgs boson decays. The main topics discussed are: (i)
parton radiation and parton-to-hadron fragmentation functions (splitting
functions at NNLO, small-$z$ NNLL resummations, global FF fits including Monte
Carlo (MC) and neural-network analyses of the latest Belle/BaBar high-precision
data, parton shower MC generators), (ii) jet properties (quark-gluon
discrimination, $e^+e^-$ event shapes and multi-jet rates at NNLO+N$^{n}$LL,
jet broadening and angularities, jet substructure at small-radius, jet charge
determination, $e^+e^-$ jet reconstruction algorithms), (iii) heavy-quark jets
(dead cone effect, charm-bottom separation, gluon-to-$b\bar{b}$ splitting), and
(iv) non-perturbative QCD phenomena (colour reconnection, baryon and
strangeness production, Bose-Einstein and Fermi-Dirac final-state correlations,
colour string dynamics: spin effects, helix hadronization).
| [
{
"created": "Sat, 4 Feb 2017 19:36:08 GMT",
"version": "v1"
}
] | 2017-02-07 | [
[
"d'Enterria",
"David",
""
],
[
"Skands",
"Peter Z.",
""
],
[
"Anderle",
"D.",
""
],
[
"Anulli",
"F.",
""
],
[
"Aparisi",
"J.",
""
],
[
"Bell",
"G.",
""
],
[
"Bertone",
"V.",
""
],
[
"Bierlich",
"C.",
""
],
[
"Carrazza",
"S.",
""
],
[
"Corcella",
"G.",
""
],
[
"d'Enterria",
"D.",
""
],
[
"Dasgupta",
"M.",
""
],
[
"Garcia",
"I.",
""
],
[
"Gehrmann",
"T.",
""
],
[
"Gituliar",
"O.",
""
],
[
"Hamacher",
"K.",
""
],
[
"Hartland",
"N. P.",
""
],
[
"Hoang",
"A. H.",
""
],
[
"Hornig",
"A.",
""
],
[
"Jadach",
"S.",
""
],
[
"Kaufmann",
"T.",
""
],
[
"Kluth",
"S.",
""
],
[
"Kolodrubetz",
"D. W.",
""
],
[
"Kusina",
"A.",
""
],
[
"Lee",
"C.",
""
],
[
"Luisoni",
"G.",
""
],
[
"Mateu",
"V.",
""
],
[
"Matevosyan",
"H.",
""
],
[
"Metzger",
"W.",
""
],
[
"Moch",
"S. O.",
""
],
[
"Monni",
"P. F.",
""
],
[
"Nachman",
"B.",
""
],
[
"Nocera",
"E. R.",
""
],
[
"Perelló",
"M.",
""
],
[
"Placzek",
"W.",
""
],
[
"Plätzer",
"S.",
""
],
[
"Perez-Ramos",
"R.",
""
],
[
"Rauco",
"G.",
""
],
[
"Richardson",
"P.",
""
],
[
"Ringer",
"F.",
""
],
[
"Rojo",
"J.",
""
],
[
"Roloff",
"Ph.",
""
],
[
"Sakaki",
"Y.",
""
],
[
"Sato",
"N.",
""
],
[
"Simoniello",
"R.",
""
],
[
"Sjöstrand",
"T.",
""
],
[
"Skands",
"P. Z.",
""
],
[
"Skrzypek",
"M.",
""
],
[
"Soyez",
"G.",
""
],
[
"Stewart",
"I. W.",
""
],
[
"Stratmann",
"M.",
""
],
[
"Talbert",
"J.",
""
],
[
"Todorova",
"S.",
""
],
[
"Tokar",
"S.",
""
],
[
"Vos",
"M.",
""
],
[
"Vossen",
"A.",
""
]
] | This document collects the proceedings of the "Parton Radiation and Fragmentation from LHC to FCC-ee" workshop (http://indico.cern.ch/e/ee\_jets16) held at CERN in Nov. 2016. The writeup reviews the latest theoretical and experimental developments on parton radiation and parton-hadron fragmentation studies --including analyses of LEP, B-factories, and LHC data-- with a focus on the future perspectives reacheable in $e^+e^-$ measurements at the Future Circular Collider (FCC-ee), with multi-ab$^{-1}$ integrated luminosities yielding 10$^{12}$ and 10$^{8}$ jets from Z and W bosons decays as well as 10$^5$ gluon jets from Higgs boson decays. The main topics discussed are: (i) parton radiation and parton-to-hadron fragmentation functions (splitting functions at NNLO, small-$z$ NNLL resummations, global FF fits including Monte Carlo (MC) and neural-network analyses of the latest Belle/BaBar high-precision data, parton shower MC generators), (ii) jet properties (quark-gluon discrimination, $e^+e^-$ event shapes and multi-jet rates at NNLO+N$^{n}$LL, jet broadening and angularities, jet substructure at small-radius, jet charge determination, $e^+e^-$ jet reconstruction algorithms), (iii) heavy-quark jets (dead cone effect, charm-bottom separation, gluon-to-$b\bar{b}$ splitting), and (iv) non-perturbative QCD phenomena (colour reconnection, baryon and strangeness production, Bose-Einstein and Fermi-Dirac final-state correlations, colour string dynamics: spin effects, helix hadronization). |
hep-ph/9804233 | Juergen Berges | J. Berges and K. Rajagopal | Color Superconductivity and Chiral Symmetry Restoration at Nonzero
Baryon Density and Temperature | 17 pages, 5 figures; footnotes and references added. Version to
appear in Nuclear Physics B | Nucl.Phys.B538:215-232,1999 | 10.1016/S0550-3213(98)00620-8 | MIT-CTP-2725 | hep-ph nucl-th | null | We explore the phase diagram of strongly interacting matter as a function of
temperature and baryon number density, using a class of models for two-flavor
QCD in which the interaction between quarks is modelled by that induced by
instantons. Our treatment allows us to investigate the possible simultaneous
formation of condensates in the conventional quark--anti-quark channel
(breaking chiral symmetry) and in a quark--quark channel leading to color
superconductivity: the spontaneous breaking of color symmetry via the formation
of quark Cooper pairs. At low temperatures, chiral symmetry restoration occurs
via a first order transition between a phase with low (or zero) baryon density
and a high density color superconducting phase. We find color superconductivity
in the high density phase for temperatures less than of order tens to 100 MeV,
and find coexisting $<qq>$ and $<\bar q q>$ condensates in this phase in the
presence of a current quark mass. At high temperatures, the chiral phase
transition is second order in the chiral limit and is a smooth crossover for
nonzero current quark mass. A tricritical point separates the first order
transition at high densities from the second order transition at high
temperatures. In the presence of a current quark mass this tricritical point
becomes a second order phase transition with Ising model exponents, suggesting
that a long correlation length may develop in heavy ion collisions in which the
phase transition is traversed at the appropriate density.
| [
{
"created": "Mon, 6 Apr 1998 03:48:16 GMT",
"version": "v1"
},
{
"created": "Mon, 14 Sep 1998 19:18:13 GMT",
"version": "v2"
}
] | 2010-02-04 | [
[
"Berges",
"J.",
""
],
[
"Rajagopal",
"K.",
""
]
] | We explore the phase diagram of strongly interacting matter as a function of temperature and baryon number density, using a class of models for two-flavor QCD in which the interaction between quarks is modelled by that induced by instantons. Our treatment allows us to investigate the possible simultaneous formation of condensates in the conventional quark--anti-quark channel (breaking chiral symmetry) and in a quark--quark channel leading to color superconductivity: the spontaneous breaking of color symmetry via the formation of quark Cooper pairs. At low temperatures, chiral symmetry restoration occurs via a first order transition between a phase with low (or zero) baryon density and a high density color superconducting phase. We find color superconductivity in the high density phase for temperatures less than of order tens to 100 MeV, and find coexisting $<qq>$ and $<\bar q q>$ condensates in this phase in the presence of a current quark mass. At high temperatures, the chiral phase transition is second order in the chiral limit and is a smooth crossover for nonzero current quark mass. A tricritical point separates the first order transition at high densities from the second order transition at high temperatures. In the presence of a current quark mass this tricritical point becomes a second order phase transition with Ising model exponents, suggesting that a long correlation length may develop in heavy ion collisions in which the phase transition is traversed at the appropriate density. |
1103.4365 | Michele Maltoni | M.C. Gonzalez-Garcia, Michele Maltoni, Jordi Salvado | Testing matter effects in propagation of atmospheric and long-baseline
neutrinos | PDFLaTeX file using JHEP3 class, 25 pages, 7 figures included.
Accepted for publication in JHEP | JHEP 1105:075,2011 | 10.1007/JHEP05(2011)075 | YITP-SB-11-07, IFT-UAM/CSIC-11-07 | hep-ph astro-ph.HE hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We quantify our current knowledge of the size and flavor structure of the
matter effects in the evolution of atmospheric and long-baseline neutrinos
based solely on the analysis of the corresponding neutrino data. To this aim we
generalize the matter potential of the Standard Model by rescaling its
strength, rotating it away from the e-e sector, and rephasing it with respect
to the vacuum term. This phenomenological parametrization can be easily
translated in terms of non-standard neutrino interactions in matter. We show
that in the most general case, the strength of the potential cannot be
determined solely by atmospheric and long-baseline data. However its flavor
composition is very much constrained and the present determination of the
neutrino masses and mixing is robust under its presence. We also present an
update of the constraints arising from this analysis in the particular case in
which no potential is present in the e-mu and e-tau sectors. Finally we
quantify to what degree in this scenario it is possible to alleviate the
tension between the oscillation results for neutrinos and antineutrinos in the
MINOS experiment and show the relevance of the high energy part of the spectrum
measured at MINOS.
| [
{
"created": "Tue, 22 Mar 2011 20:00:14 GMT",
"version": "v1"
},
{
"created": "Sat, 7 May 2011 04:04:33 GMT",
"version": "v2"
}
] | 2011-05-23 | [
[
"Gonzalez-Garcia",
"M. C.",
""
],
[
"Maltoni",
"Michele",
""
],
[
"Salvado",
"Jordi",
""
]
] | We quantify our current knowledge of the size and flavor structure of the matter effects in the evolution of atmospheric and long-baseline neutrinos based solely on the analysis of the corresponding neutrino data. To this aim we generalize the matter potential of the Standard Model by rescaling its strength, rotating it away from the e-e sector, and rephasing it with respect to the vacuum term. This phenomenological parametrization can be easily translated in terms of non-standard neutrino interactions in matter. We show that in the most general case, the strength of the potential cannot be determined solely by atmospheric and long-baseline data. However its flavor composition is very much constrained and the present determination of the neutrino masses and mixing is robust under its presence. We also present an update of the constraints arising from this analysis in the particular case in which no potential is present in the e-mu and e-tau sectors. Finally we quantify to what degree in this scenario it is possible to alleviate the tension between the oscillation results for neutrinos and antineutrinos in the MINOS experiment and show the relevance of the high energy part of the spectrum measured at MINOS. |
1704.04201 | Jiang-Hao Yu | Fa Peng Huang, Jiang-Hao Yu | Explore Inert Dark Matter Blind Spots with Gravitational Wave Signatures | 10 pages, 3 figures | Phys. Rev. D 98, 095022 (2018) | 10.1103/PhysRevD.98.095022 | ACFI-T17-06 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Motivated by the absence of dark matter signals in direct detection
experiments and the discovery of gravitational waves (GWs) at aLIGO, we discuss
the possibility to explore a generic classes of scalar dark matter models using
the complementary searches via phase transition gravitational waves and the
future lepton collider signatures. We focus on the inert scalar multiplet dark
matter models and the mixed inert scalar dark matter models, which could
undergo a strong first-order phase transitions during the evolution of the
early universe, and might produce detectable phase transition GW signals at
future GW experiments, such as eLISA, DECIGO and BBO. We find that the future
GW signature, together with circular electron-positron collider, could further
explore the model's blind spot parameter region, at which the dark matter-Higgs
coupling is identically zero, thus avoiding the dark matter spin-independent
direct detection constraints.
| [
{
"created": "Thu, 13 Apr 2017 16:24:07 GMT",
"version": "v1"
}
] | 2018-12-05 | [
[
"Huang",
"Fa Peng",
""
],
[
"Yu",
"Jiang-Hao",
""
]
] | Motivated by the absence of dark matter signals in direct detection experiments and the discovery of gravitational waves (GWs) at aLIGO, we discuss the possibility to explore a generic classes of scalar dark matter models using the complementary searches via phase transition gravitational waves and the future lepton collider signatures. We focus on the inert scalar multiplet dark matter models and the mixed inert scalar dark matter models, which could undergo a strong first-order phase transitions during the evolution of the early universe, and might produce detectable phase transition GW signals at future GW experiments, such as eLISA, DECIGO and BBO. We find that the future GW signature, together with circular electron-positron collider, could further explore the model's blind spot parameter region, at which the dark matter-Higgs coupling is identically zero, thus avoiding the dark matter spin-independent direct detection constraints. |
0801.4569 | Christopher Lee | Christian W. Bauer, Sean Fleming, Christopher Lee, and George Sterman | Factorization of e+e- Event Shape Distributions with Hadronic Final
States in Soft Collinear Effective Theory | 21 pages. Journal version. Defined an explicit thrust axis operator;
clarified meaning of a delta function operator | Phys.Rev.D78:034027,2008 | 10.1103/PhysRevD.78.034027 | UCB-PTH-08/02, YITP-SB-08-02 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present a new analysis of two-jet event shape distributions in soft
collinear effective theory. Extending previous results, we observe that a large
class of such distributions can be expressed in terms of vacuum matrix elements
of operators in the effective theory. We match these matrix elements to the
full theory in the two-jet limit without assuming factorization of the complete
set of hadronic final states into independent sums over partonic collinear and
soft states. We also briefly discuss the relationship of this approach to
diagrammatic factorization in the full theory.
| [
{
"created": "Wed, 30 Jan 2008 20:09:50 GMT",
"version": "v1"
},
{
"created": "Wed, 24 Sep 2008 21:32:08 GMT",
"version": "v2"
}
] | 2008-11-26 | [
[
"Bauer",
"Christian W.",
""
],
[
"Fleming",
"Sean",
""
],
[
"Lee",
"Christopher",
""
],
[
"Sterman",
"George",
""
]
] | We present a new analysis of two-jet event shape distributions in soft collinear effective theory. Extending previous results, we observe that a large class of such distributions can be expressed in terms of vacuum matrix elements of operators in the effective theory. We match these matrix elements to the full theory in the two-jet limit without assuming factorization of the complete set of hadronic final states into independent sums over partonic collinear and soft states. We also briefly discuss the relationship of this approach to diagrammatic factorization in the full theory. |
2004.03992 | Shuang-Yong Zhou | Yu-Jia Wang, Feng-Kun Guo, Cen Zhang, Shuang-Yong Zhou | Generalized positivity bounds on chiral perturbation theory | 31 pages, 15 figures; JHEP version | null | 10.1007/JHEP07(2020)214 | null | hep-ph hep-lat hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Recently, a new set of positivity bounds with $t$ derivatives have been
discovered. We explore the generic features of these generalized positivity
bounds with loop amplitudes and apply these bounds to constrain the parameters
in chiral perturbation theory up to the next-to-next-to-leading order. We show
that the generalized positivity bounds give rise to stronger constraints on the
$\bar l_i$ constants, compared to the existing axiomatic bounds. The parameter
space of the $b_i$ constants is constrained by the generalized positivity
bounds to be a convex region that is enclosed for many sections of the total
space. We also show that the improved version of these positivity bounds can
further enhance the constraints on the parameters. The often used Pad\'e
unitarization method however does not improve the analyticity of the amplitudes
in the chiral perturbation theory at low energies.
| [
{
"created": "Wed, 8 Apr 2020 13:36:03 GMT",
"version": "v1"
},
{
"created": "Thu, 5 Nov 2020 02:21:03 GMT",
"version": "v2"
}
] | 2020-11-06 | [
[
"Wang",
"Yu-Jia",
""
],
[
"Guo",
"Feng-Kun",
""
],
[
"Zhang",
"Cen",
""
],
[
"Zhou",
"Shuang-Yong",
""
]
] | Recently, a new set of positivity bounds with $t$ derivatives have been discovered. We explore the generic features of these generalized positivity bounds with loop amplitudes and apply these bounds to constrain the parameters in chiral perturbation theory up to the next-to-next-to-leading order. We show that the generalized positivity bounds give rise to stronger constraints on the $\bar l_i$ constants, compared to the existing axiomatic bounds. The parameter space of the $b_i$ constants is constrained by the generalized positivity bounds to be a convex region that is enclosed for many sections of the total space. We also show that the improved version of these positivity bounds can further enhance the constraints on the parameters. The often used Pad\'e unitarization method however does not improve the analyticity of the amplitudes in the chiral perturbation theory at low energies. |
hep-ph/0004217 | Daniel Boer | Daniel Boer (RIKEN-BNL Research Center) | Double transverse spin asymmetries in vector boson production | 12 pages, Revtex, 2 Postscript figures, uses aps.sty, epsf.sty;
figures replaced, a few minor other corrections | Phys.Rev. D62 (2000) 094029 | 10.1103/PhysRevD.62.094029 | BNL-67394, RBRC-90 | hep-ph | null | We investigate a helicity non-flip double transverse spin asymmetry in vector
boson production in hadron-hadron scattering, which was first considered by
Ralston and Soper at the tree level. It does not involve transversity functions
and in principle also arises in W-boson production for which we present the
expressions. The asymmetry requires observing the transverse momentum of the
vector boson, but it is not suppressed by explicit inverse powers of a large
energy scale. However, as we will show, inclusion of Sudakov factors causes
suppression of the asymmetry, which increases with energy. Moreover, the
asymmetry is shown to be approximately proportional to x_1 g_1(x_1) x_2 \bar
g_1(x_2), which gives rise to additional suppression at small values of the
light cone momentum fractions. This implies that it is negligible for Z or W
production and is mainly of interest for \gamma^* at low energies. We also
compare the asymmetry with other types of double transverse spin asymmetries
and discuss how to disentangle them.
| [
{
"created": "Mon, 24 Apr 2000 20:18:39 GMT",
"version": "v1"
},
{
"created": "Tue, 29 Aug 2000 21:57:36 GMT",
"version": "v2"
},
{
"created": "Sat, 9 Sep 2000 22:04:47 GMT",
"version": "v3"
}
] | 2009-10-31 | [
[
"Boer",
"Daniel",
"",
"RIKEN-BNL Research Center"
]
] | We investigate a helicity non-flip double transverse spin asymmetry in vector boson production in hadron-hadron scattering, which was first considered by Ralston and Soper at the tree level. It does not involve transversity functions and in principle also arises in W-boson production for which we present the expressions. The asymmetry requires observing the transverse momentum of the vector boson, but it is not suppressed by explicit inverse powers of a large energy scale. However, as we will show, inclusion of Sudakov factors causes suppression of the asymmetry, which increases with energy. Moreover, the asymmetry is shown to be approximately proportional to x_1 g_1(x_1) x_2 \bar g_1(x_2), which gives rise to additional suppression at small values of the light cone momentum fractions. This implies that it is negligible for Z or W production and is mainly of interest for \gamma^* at low energies. We also compare the asymmetry with other types of double transverse spin asymmetries and discuss how to disentangle them. |
1007.4341 | Hilmar Forkel | Hilmar Forkel | Light scalar tetraquarks from a holographic perspective | 16 pages, 2 figures, vs2 contains a few additional, explanatory
comments to match the published version (results and conclusions unchanged) | Phys.Lett.B694:252-257,2010 | 10.1016/j.physletb.2010.09.063 | null | hep-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We discuss how a dominant tetraquark component of the lightest scalar mesons
may emerge in AdS/QCD gravity duals. In particular, we show that the
exceptionally strong binding required to render the tetraquark ground state
lighter than the lowest-lying scalar quark-antiquark nonet can be
holographically encoded into bulk-mass corrections for the tetraquark's dual
mode. The latter are argued to originate from the anomalous dimension of the
corresponding four-quark interpolator. To provide a concrete example, we
implement this mechanism into the dilaton soft-wall dual for holographic QCD.
Preventing the lowest-lying dual mode from collapsing into the AdS boundary
then establishes a rather generic lower bound on the tetraquark mass (which may
be overcome in the presence of additional background fields). We further
demonstrate that the higher tetraquark excitations can become heavier than
their quark-antiquark counterparts and are thus likely to dissolve into the
multiparticle continuum.
| [
{
"created": "Sun, 25 Jul 2010 18:53:43 GMT",
"version": "v1"
},
{
"created": "Sun, 3 Oct 2010 14:44:31 GMT",
"version": "v2"
}
] | 2010-12-17 | [
[
"Forkel",
"Hilmar",
""
]
] | We discuss how a dominant tetraquark component of the lightest scalar mesons may emerge in AdS/QCD gravity duals. In particular, we show that the exceptionally strong binding required to render the tetraquark ground state lighter than the lowest-lying scalar quark-antiquark nonet can be holographically encoded into bulk-mass corrections for the tetraquark's dual mode. The latter are argued to originate from the anomalous dimension of the corresponding four-quark interpolator. To provide a concrete example, we implement this mechanism into the dilaton soft-wall dual for holographic QCD. Preventing the lowest-lying dual mode from collapsing into the AdS boundary then establishes a rather generic lower bound on the tetraquark mass (which may be overcome in the presence of additional background fields). We further demonstrate that the higher tetraquark excitations can become heavier than their quark-antiquark counterparts and are thus likely to dissolve into the multiparticle continuum. |
2212.08691 | Giacomo Cacciapaglia | Giacomo Cacciapaglia, Aldo Deandrea and Shahram Vatani | Is the muon a third family lepton? | 4 pages, 2 figures; updated with the latest RK measurement, main
discussion and conclusions unchanged; extended version, 6 pages, 2 figures,
matching published version | null | 10.1103/PhysRevD.108.016010 | null | hep-ph | http://creativecommons.org/licenses/by/4.0/ | We propose a new family structure for the Standard Model fermions, where the
muon is assigned to the third family, taking the placeholder from the tau
lepton. This reassignment, which is a mere choice of convention in the Standard
Model, becomes physically meaningful in the presence of new physics assuming a
direct link between quarks and leptons. In fact, when quark and leptons are
coupled by new interactions, the choice of which lepton is assigned to a
particular quark generation brings physical consequences, revealing potentially
meaningful patterns in the masses and mixings, while pointing to precise and
testable predictions for experiments.
| [
{
"created": "Fri, 16 Dec 2022 19:42:26 GMT",
"version": "v1"
},
{
"created": "Fri, 6 Jan 2023 17:02:45 GMT",
"version": "v2"
},
{
"created": "Mon, 3 Jul 2023 12:02:10 GMT",
"version": "v3"
}
] | 2023-07-26 | [
[
"Cacciapaglia",
"Giacomo",
""
],
[
"Deandrea",
"Aldo",
""
],
[
"Vatani",
"Shahram",
""
]
] | We propose a new family structure for the Standard Model fermions, where the muon is assigned to the third family, taking the placeholder from the tau lepton. This reassignment, which is a mere choice of convention in the Standard Model, becomes physically meaningful in the presence of new physics assuming a direct link between quarks and leptons. In fact, when quark and leptons are coupled by new interactions, the choice of which lepton is assigned to a particular quark generation brings physical consequences, revealing potentially meaningful patterns in the masses and mixings, while pointing to precise and testable predictions for experiments. |
1602.05811 | Alexander Kalweit | P. Braun-Munzinger, A. Kalweit, K. Redlich, J. Stachel | Confronting fluctuations of conserved charges in central nuclear
collisions at the LHC with predictions from Lattice QCD | 5 pages, 4 figures, Proceedings of the XXV International Conference
On Ultrarelativistic Nucleus-Nucleus Collisions in Kobe (Quark Matter 2015).
Accepted by NPA | null | 10.1016/j.nuclphysa.2016.02.024 | null | hep-ph hep-lat nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We construct net baryon number and strangeness susceptibilities as well as
correlations between electric charge, strangeness and baryon number from
experimental data on the particle production yields at midrapidity of the ALICE
Collaboration at CERN. The data were taken in central Pb-Pb collisions at
$\sqrt{s_{\rm NN}}$~=~2.76~TeV and cover one unit of rapidity. We show that the
resulting fluctuations and correlations are consistent with Lattice QCD results
at the chiral crossover pseudocritical temperature $T_{c} \simeq$ 155 MeV. This
agreement lends strong support to the assumption that the fireball created in
these collisions is of thermal origin and exhibits characteristic properties
expected in QCD at the transition from the quark gluon plasma to the hadronic
phase. Since Lattice QCD calculations are performed at a baryochemical
potential of $\mu_{B}$ = 0, the comparisons with LHC data are the most direct
due to the vanishing baryon transport to midrapidity at these high energies.
| [
{
"created": "Thu, 18 Feb 2016 14:18:04 GMT",
"version": "v1"
}
] | 2016-11-23 | [
[
"Braun-Munzinger",
"P.",
""
],
[
"Kalweit",
"A.",
""
],
[
"Redlich",
"K.",
""
],
[
"Stachel",
"J.",
""
]
] | We construct net baryon number and strangeness susceptibilities as well as correlations between electric charge, strangeness and baryon number from experimental data on the particle production yields at midrapidity of the ALICE Collaboration at CERN. The data were taken in central Pb-Pb collisions at $\sqrt{s_{\rm NN}}$~=~2.76~TeV and cover one unit of rapidity. We show that the resulting fluctuations and correlations are consistent with Lattice QCD results at the chiral crossover pseudocritical temperature $T_{c} \simeq$ 155 MeV. This agreement lends strong support to the assumption that the fireball created in these collisions is of thermal origin and exhibits characteristic properties expected in QCD at the transition from the quark gluon plasma to the hadronic phase. Since Lattice QCD calculations are performed at a baryochemical potential of $\mu_{B}$ = 0, the comparisons with LHC data are the most direct due to the vanishing baryon transport to midrapidity at these high energies. |
hep-ph/9612230 | Claudio Masumi Maekawa | C.M.Maekawa and M.R. Robilotta | Chiral Symmetry: Pion-Nucleon Interactions in Constituent Quark Models | revtex style, 28 pages, 2 figures, use epsf.sty | Phys.Rev.C55:2675-2683,1997 | 10.1103/PhysRevC.55.2675 | null | hep-ph | null | We study the interactions of an elementary pion with a nucleon made of
constituent quarks and show that the enforcement of chiral symmetry requires
the use of a two-body operator, whose form does not depend on the choice of the
pion-quark coupling. The coordinate space NN effective potential in the pion
exchange channel is given as a sum of terms involving two gradients, that
operate on both the usual Yukawa function and the confining potential. We also
consider an application to the case of quarks bound by a harmonic potential and
show that corrections due to the symmetry are important.
| [
{
"created": "Mon, 2 Dec 1996 20:12:57 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Maekawa",
"C. M.",
""
],
[
"Robilotta",
"M. R.",
""
]
] | We study the interactions of an elementary pion with a nucleon made of constituent quarks and show that the enforcement of chiral symmetry requires the use of a two-body operator, whose form does not depend on the choice of the pion-quark coupling. The coordinate space NN effective potential in the pion exchange channel is given as a sum of terms involving two gradients, that operate on both the usual Yukawa function and the confining potential. We also consider an application to the case of quarks bound by a harmonic potential and show that corrections due to the symmetry are important. |
hep-ph/0001072 | null | G. Dvali, M. Shifman | Families as Neighbors in Extra Dimension | Latex, 11 pages, no figures | Phys.Lett. B475 (2000) 295-302 | 10.1016/S0370-2693(00)00083-6 | TPI-MINN-00/03-T, UMN-TH-1836/00, NYU-TH-00/01/01 | hep-ph | null | We propose a new mechanism for explanation of the fermion hierarchy without
introducing any family symmetries. Instead, we postulate that different
generations live on different branes embedded in a relatively large extra
dimension, where the gauge fields can propagate. The electroweak symmetry is
broken on a separate brane, which is a source of exponentially decaying Higgs
profile in the bulk. The resulting fermion masses and mixings are determined by
an exponentially suppressed overlap of the fermion and Higgs wave functions and
are automatically hierarchical even if all copies are identical and there is no
hierarchy of distances. In this framework the well known pattern of the
"nearest neighbor mixing" is predicted due to the fact that the families are
literally neighbors in the extra space. This picture may also provide a new way
of a hierarchically weak supersymmetry breaking, provided that the combination
of three family branes is a non-BPS configuration, although each of them,
individually taken, is. This results in exponentially weak supersymmetry
breaking. We also discuss the issue of embedding identical branes in the
compact spaces and localization of the fermionic zero modes.
| [
{
"created": "Mon, 10 Jan 2000 19:24:25 GMT",
"version": "v1"
}
] | 2009-10-31 | [
[
"Dvali",
"G.",
""
],
[
"Shifman",
"M.",
""
]
] | We propose a new mechanism for explanation of the fermion hierarchy without introducing any family symmetries. Instead, we postulate that different generations live on different branes embedded in a relatively large extra dimension, where the gauge fields can propagate. The electroweak symmetry is broken on a separate brane, which is a source of exponentially decaying Higgs profile in the bulk. The resulting fermion masses and mixings are determined by an exponentially suppressed overlap of the fermion and Higgs wave functions and are automatically hierarchical even if all copies are identical and there is no hierarchy of distances. In this framework the well known pattern of the "nearest neighbor mixing" is predicted due to the fact that the families are literally neighbors in the extra space. This picture may also provide a new way of a hierarchically weak supersymmetry breaking, provided that the combination of three family branes is a non-BPS configuration, although each of them, individually taken, is. This results in exponentially weak supersymmetry breaking. We also discuss the issue of embedding identical branes in the compact spaces and localization of the fermionic zero modes. |
1312.2900 | Juan Helo | Juan Helo, Martin Hirsch, Sergey Kovalenko | Heavy neutrino searches at the LHC with displaced vertices | 7 pages, 5 figures | Phys. Rev. D 89, 073005 (2014) | 10.1103/PhysRevD.89.073005 | null | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Sterile neutrinos with masses in the range (1-100) GeV, have been searched
for in a variety of experiments. Here, we discuss the prospects to search for
sterile neutrinos at the LHC using displaced vertices. Two different cases are
discussed: (i) the standard model extended with sterile neutrinos and (ii)
right-handed neutrinos in a left-right symmetric extension of the standard
model. A dedicated displaced vertex search will allow to probe parts of the
parameter space not accessible to other searches, but will require large
luminosity in both cases.
| [
{
"created": "Tue, 10 Dec 2013 18:02:45 GMT",
"version": "v1"
}
] | 2014-04-23 | [
[
"Helo",
"Juan",
""
],
[
"Hirsch",
"Martin",
""
],
[
"Kovalenko",
"Sergey",
""
]
] | Sterile neutrinos with masses in the range (1-100) GeV, have been searched for in a variety of experiments. Here, we discuss the prospects to search for sterile neutrinos at the LHC using displaced vertices. Two different cases are discussed: (i) the standard model extended with sterile neutrinos and (ii) right-handed neutrinos in a left-right symmetric extension of the standard model. A dedicated displaced vertex search will allow to probe parts of the parameter space not accessible to other searches, but will require large luminosity in both cases. |
1507.02131 | Zhi-Gang Wang | Zhi-Gang Wang | Analysis of the scalar nonet mesons with the QCD sum rules | 22 pages, 32 figures | Eur. Phys. J. C76 (2016) 427 | 10.1140/epjc/s10052-016-4262-y | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this article, we assume that the nonet scalar mesons below $1\,\rm{ GeV}$
are the two-quark-tetraquark mixed states and study their masses and pole
residues using the QCD sum rules. In calculation, we take into account the
vacuum condensates up to dimension 10 and the $\mathcal{O}(\alpha_s)$
corrections to the perturbative terms in the operator product expansion. We
determine the mixing angles, which indicate the two-quark components are much
larger than $50\%$, then obtain the masses and pole residues of the nonet
scalar mesons.
| [
{
"created": "Mon, 6 Jul 2015 12:20:21 GMT",
"version": "v1"
},
{
"created": "Mon, 28 Dec 2015 12:40:42 GMT",
"version": "v2"
},
{
"created": "Sun, 21 Feb 2016 11:56:49 GMT",
"version": "v3"
},
{
"created": "Sun, 8 May 2016 01:51:24 GMT",
"version": "v4"
},
{
"created": "Tue, 14 Jun 2016 03:12:18 GMT",
"version": "v5"
},
{
"created": "Thu, 7 Jul 2016 02:14:30 GMT",
"version": "v6"
},
{
"created": "Wed, 13 Jul 2016 08:58:15 GMT",
"version": "v7"
}
] | 2016-08-02 | [
[
"Wang",
"Zhi-Gang",
""
]
] | In this article, we assume that the nonet scalar mesons below $1\,\rm{ GeV}$ are the two-quark-tetraquark mixed states and study their masses and pole residues using the QCD sum rules. In calculation, we take into account the vacuum condensates up to dimension 10 and the $\mathcal{O}(\alpha_s)$ corrections to the perturbative terms in the operator product expansion. We determine the mixing angles, which indicate the two-quark components are much larger than $50\%$, then obtain the masses and pole residues of the nonet scalar mesons. |
hep-ph/0310345 | Altug Ozpineci | A.Ozpineci S.B. Yakovlev V.S. Zamiralov | QCD Sum Rules: Intercrossed Relations for the Sigma^0-Lambda Mass
Splitting | Added one reference. Minor changes in the text and acknowledgment | Mod.Phys.Lett. A20 (2005) 243-250 | 10.1142/S021773230501649X | NPI MSU Preprint 2003-18/731 | hep-ph | null | New relations between QCD Borel sum rules for masses of Sigma^0 and Lambda
hyperons are constructed. It is shown that starting from the sum rule for the
Sigma^0 hyperon mass it is straightforward to obtain the corresponding sum rule
for the Lambda hyperon mass and vice versa.
PACS: 11.30.Hv, 11.55.Hx Keywords: Octet Baryons, Mass sum rules, SU(3)_f
Symmetry
| [
{
"created": "Thu, 30 Oct 2003 13:07:42 GMT",
"version": "v1"
},
{
"created": "Tue, 30 Mar 2004 08:27:24 GMT",
"version": "v2"
}
] | 2009-11-10 | [
[
"Zamiralov",
"A. Ozpineci S. B. Yakovlev V. S.",
""
]
] | New relations between QCD Borel sum rules for masses of Sigma^0 and Lambda hyperons are constructed. It is shown that starting from the sum rule for the Sigma^0 hyperon mass it is straightforward to obtain the corresponding sum rule for the Lambda hyperon mass and vice versa. PACS: 11.30.Hv, 11.55.Hx Keywords: Octet Baryons, Mass sum rules, SU(3)_f Symmetry |
hep-ph/0510302 | Boris Kerbikov | B.Kerbikov | Unusual condensates in quark and atomic systems | Lectures delivered at 8th Moscow school of Physics (33rd ITEP Winter
School of Physics) | Surveys High Energ.Phys. 20 (2006) 47-57 | 10.1080/01422410500424519 | null | hep-ph cond-mat.supr-con | null | In these lectures we discuss condensates which are formed in quark matter
when it is squeezed and in a gas of fermionic atoms when it is cooled. The
behavior of these two seemingly very different systems reveals striking
similarities. In particular, in both systems the Bose-Einstein condensate to
Bardeen--Cooper-Schrieffer (BEC-BCS) crossover takes place.
| [
{
"created": "Sat, 22 Oct 2005 18:38:59 GMT",
"version": "v1"
},
{
"created": "Mon, 31 Oct 2005 15:13:46 GMT",
"version": "v2"
}
] | 2009-11-11 | [
[
"Kerbikov",
"B.",
""
]
] | In these lectures we discuss condensates which are formed in quark matter when it is squeezed and in a gas of fermionic atoms when it is cooled. The behavior of these two seemingly very different systems reveals striking similarities. In particular, in both systems the Bose-Einstein condensate to Bardeen--Cooper-Schrieffer (BEC-BCS) crossover takes place. |
hep-ph/9905470 | Ambar Ghosal | Ambar Ghosal | Bi-maximal Neutrino Mixing With SO(3) Flavour Symmetry | 13pages, Latex, revised version | null | null | SINP/TNP/99-20 | hep-ph | null | We demonstrate that an $SU(2)_L\times U(1)_Y$ model with extended Higgs
sector gives rise to bi-maximal neutrino mixing through the incorporation of
SO(3) flavour symmetry and discrete symmetry. The neutrino and the charged
lepton masses are generated due to higher dimensional terms. The hierarchical
structures of neutrinos and charged leptons are obtained due to inclusion of
SO(3) flavour symmetry and discrete symmetry.The model can accommodate the
vacuum oscillation solution of solar neutrino problem, through reasonable
choice of model parameters along with the atmospheric neutrino experimental
result.
| [
{
"created": "Tue, 25 May 1999 09:04:32 GMT",
"version": "v1"
},
{
"created": "Tue, 15 Jun 1999 07:16:59 GMT",
"version": "v2"
}
] | 2007-05-23 | [
[
"Ghosal",
"Ambar",
""
]
] | We demonstrate that an $SU(2)_L\times U(1)_Y$ model with extended Higgs sector gives rise to bi-maximal neutrino mixing through the incorporation of SO(3) flavour symmetry and discrete symmetry. The neutrino and the charged lepton masses are generated due to higher dimensional terms. The hierarchical structures of neutrinos and charged leptons are obtained due to inclusion of SO(3) flavour symmetry and discrete symmetry.The model can accommodate the vacuum oscillation solution of solar neutrino problem, through reasonable choice of model parameters along with the atmospheric neutrino experimental result. |
1505.05634 | Tapashi Das | Tapashi Das, D. K. Choudhury, K. K. Pathak | RMS and charge radii in a potential model | 10 pages, 3 tables in Indian Journal of Physics (2016) | null | 10.1007/s12648-016-0866-1 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The Dalgarno's method of perturbation is used to solve the Schrodinger's
equation with the Cornell potential $V(r)=-\frac{4\alpha_s}{3r}+br+c$. The
short range and long range effect of the potential is incorporated in the same
wave function by using two scales $r^S$ and $r^L$ as an integration limit. The
results for bounds on r.m.s. radii of various heavy flavored mesons are
reported. We have also showed the relation between r.m.s. and charge radius of
mesons.
| [
{
"created": "Thu, 21 May 2015 07:53:58 GMT",
"version": "v1"
},
{
"created": "Sat, 23 May 2015 09:54:03 GMT",
"version": "v2"
},
{
"created": "Mon, 17 Aug 2015 09:52:43 GMT",
"version": "v3"
},
{
"created": "Tue, 31 May 2016 04:12:13 GMT",
"version": "v4"
}
] | 2016-06-01 | [
[
"Das",
"Tapashi",
""
],
[
"Choudhury",
"D. K.",
""
],
[
"Pathak",
"K. K.",
""
]
] | The Dalgarno's method of perturbation is used to solve the Schrodinger's equation with the Cornell potential $V(r)=-\frac{4\alpha_s}{3r}+br+c$. The short range and long range effect of the potential is incorporated in the same wave function by using two scales $r^S$ and $r^L$ as an integration limit. The results for bounds on r.m.s. radii of various heavy flavored mesons are reported. We have also showed the relation between r.m.s. and charge radius of mesons. |
0706.4185 | Benjamin Grinstein | Benjamin Grinstein | Minimal Flavor Violation | Talk presented at the 4th International Workshop on the CKM Unitarity
Triangle, December 12-16, 2006, Nagoya, Japan; latex, 4 pp | null | null | UCSD-PTH-07-07 | hep-ph | null | If new physics is called upon to explain away fine tunings, like the
hierarchy problem, then, we argue, the principle of Minimal Flavor Violation is
inescapable. We review the principle and recent extensions to the lepton sector
and to Grand-Unified theories.
| [
{
"created": "Thu, 28 Jun 2007 10:25:07 GMT",
"version": "v1"
}
] | 2007-06-29 | [
[
"Grinstein",
"Benjamin",
""
]
] | If new physics is called upon to explain away fine tunings, like the hierarchy problem, then, we argue, the principle of Minimal Flavor Violation is inescapable. We review the principle and recent extensions to the lepton sector and to Grand-Unified theories. |
1612.07091 | Enrique Ruiz Arriola | Enrique Ruiz Arriola, Wojciech Broniowski, Eugenio Megias and Lorenzo
L. Salcedo | Thermal shifts, fluctuations, and missing states | 6 pages. 2 figures. Talk presented by E.R.A. at the YSTAR2016 meeting
Excited Hyperons in QCD Thermodynamics at Freeze-Out, 16-17 November 2016,
Thomas Jefferson National Accelerator Facility, Newport News, VA | null | null | null | hep-ph hep-lat nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Thermal shifts and fluctuations at finite temperature below the deconfinement
crossover from hadronic matter to the quark-gluon plasma provide a viable way
to search for missing states with given quantum numbers in the hadronic
spectrum. We analyze three realizations of the hadron resonance gas model in
the light quark (uds) sector: the states from the Particle Data Group tables
with or without width and from the Relativized Quark Model. We elaborate on the
meaning of hadronic completeness and thermodynamical equivalence on the light
of lattice QCD trace anomaly, heavy quark entropy shift and baryon,charge and
strangeness susceptibilities.
| [
{
"created": "Wed, 21 Dec 2016 13:08:51 GMT",
"version": "v1"
}
] | 2016-12-22 | [
[
"Arriola",
"Enrique Ruiz",
""
],
[
"Broniowski",
"Wojciech",
""
],
[
"Megias",
"Eugenio",
""
],
[
"Salcedo",
"Lorenzo L.",
""
]
] | Thermal shifts and fluctuations at finite temperature below the deconfinement crossover from hadronic matter to the quark-gluon plasma provide a viable way to search for missing states with given quantum numbers in the hadronic spectrum. We analyze three realizations of the hadron resonance gas model in the light quark (uds) sector: the states from the Particle Data Group tables with or without width and from the Relativized Quark Model. We elaborate on the meaning of hadronic completeness and thermodynamical equivalence on the light of lattice QCD trace anomaly, heavy quark entropy shift and baryon,charge and strangeness susceptibilities. |
hep-ph/0107289 | Pedro Miguel Martins Ferreira | P.M. Ferreira | One-loop stau masses in the effective potential approach | 11 pages, 3 figures | null | null | DIAS-STP-01-14 | hep-ph | null | We calculate the one-loop contributions to the tau slepton masses in the
Minimal Supersymmetric Standard Model in the effective potential approach. For
the majority of parameter space under study, those corrections are shown to
elevate the value of the lightest stau mass.
| [
{
"created": "Fri, 27 Jul 2001 17:11:29 GMT",
"version": "v1"
},
{
"created": "Mon, 30 Jul 2001 14:05:03 GMT",
"version": "v2"
}
] | 2007-05-23 | [
[
"Ferreira",
"P. M.",
""
]
] | We calculate the one-loop contributions to the tau slepton masses in the Minimal Supersymmetric Standard Model in the effective potential approach. For the majority of parameter space under study, those corrections are shown to elevate the value of the lightest stau mass. |
hep-ph/0103201 | Steen Hannestad | Steen Hannestad and Georg Raffelt | New Supernova Limit on Large Extra Dimensions | 4 pages, 3 figures, slightly expanded discussion, matches version to
appear in PRL | Phys.Rev.Lett.87:051301,2001 | 10.1103/PhysRevLett.87.051301 | null | hep-ph astro-ph | null | If large extra dimensions exist in nature, supernova (SN) cores will emit
large fluxes of Kaluza-Klein gravitons, producing a cosmic background of these
particles with energies and masses up to about 100 MeV. Radiative decays then
give rise to a diffuse cosmic gamma-ray background with E_gamma < 100 MeV which
is well in excess of the observations if more than 0.5-1% of the SN energy is
emitted into the new channel. This argument complements and tightens the
well-known cooling limit from the observed duration of the SN1987A neutrino
burst. For two extra dimensions we derive a conservative bound on their radius
of R < 0.9 x 10^-4 mm, for three extra dimensions it is R < 1.9 x 10^-7 mm.
| [
{
"created": "Mon, 19 Mar 2001 12:19:37 GMT",
"version": "v1"
},
{
"created": "Wed, 6 Jun 2001 11:49:11 GMT",
"version": "v2"
}
] | 2011-05-05 | [
[
"Hannestad",
"Steen",
""
],
[
"Raffelt",
"Georg",
""
]
] | If large extra dimensions exist in nature, supernova (SN) cores will emit large fluxes of Kaluza-Klein gravitons, producing a cosmic background of these particles with energies and masses up to about 100 MeV. Radiative decays then give rise to a diffuse cosmic gamma-ray background with E_gamma < 100 MeV which is well in excess of the observations if more than 0.5-1% of the SN energy is emitted into the new channel. This argument complements and tightens the well-known cooling limit from the observed duration of the SN1987A neutrino burst. For two extra dimensions we derive a conservative bound on their radius of R < 0.9 x 10^-4 mm, for three extra dimensions it is R < 1.9 x 10^-7 mm. |
0707.3145 | Daniel Phillips | Prashanth Jaikumar, Daniel R. Phillips, Lucas Platter, Madappa Prakash | Muon production in low-energy electron-nucleon and electron-nucleus
scattering | 24 pages. Additional figure showing energy-dependence of total cross
section, minor changes to text. Conclusions unaltered. This version to appear
in Physical Review D | Phys.Rev.D76:115001,2007 | 10.1103/PhysRevD.76.115001 | null | hep-ph nucl-ex nucl-th | null | Recently, muon production in electron-proton scattering has been suggested as
a possible candidate reaction for the identification of lepton-flavor violation
due to physics beyond the Standard Model. Here we point out that the
Standard-Model processes $e^- p \to \mu^- p \bar{\nu}_\mu \nu_e$ and $e^- p \to
e^- n \mu^+ \nu_\mu$ can cloud potential beyond-the-Standard-Model signals in
electron-proton collisions. We find that Standard-Model $e p \to \mu X$ cross
sections exceed those from lepton-flavor-violating operators by several orders
of magnitude. We also discuss the possibility of using a nuclear target to
enhance the $e p \to \mu X$ signal.
| [
{
"created": "Fri, 20 Jul 2007 20:14:38 GMT",
"version": "v1"
},
{
"created": "Fri, 30 Nov 2007 19:44:33 GMT",
"version": "v2"
}
] | 2008-11-26 | [
[
"Jaikumar",
"Prashanth",
""
],
[
"Phillips",
"Daniel R.",
""
],
[
"Platter",
"Lucas",
""
],
[
"Prakash",
"Madappa",
""
]
] | Recently, muon production in electron-proton scattering has been suggested as a possible candidate reaction for the identification of lepton-flavor violation due to physics beyond the Standard Model. Here we point out that the Standard-Model processes $e^- p \to \mu^- p \bar{\nu}_\mu \nu_e$ and $e^- p \to e^- n \mu^+ \nu_\mu$ can cloud potential beyond-the-Standard-Model signals in electron-proton collisions. We find that Standard-Model $e p \to \mu X$ cross sections exceed those from lepton-flavor-violating operators by several orders of magnitude. We also discuss the possibility of using a nuclear target to enhance the $e p \to \mu X$ signal. |
2005.01197 | Azad Inshalla oglu Ahmadov | A.I. Ahmadov | Muon pair production in the process $e^+ +e^- \to e^+ +e^- +\mu^+ +
\mu^-$ by the two-photon collisions $\gamma \gamma \to \mu^+ \mu^-$ at high
energies. The transverse momentum distributions | 29 pages, 28 figures | null | null | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this present paper, we investigate the muon pairs production in the
interaction between two quasireal photons in $e^+e^-$ collision. The total and
differential cross section of the process $\gamma \gamma \to \mu^+\mu^-$ at a
beam energy of photons from 3 GeV to 40 GeV in the center-of-mass and for
different values of muon transverse momentum and the muon rapidity and the muon
angle are calculated. We also study the total cross section, as a function of
the $e^+ e^-$ center-of-mass energy $\sqrt {s}$ in the region 5 GeV $\leq \sqrt
{s} \leq$ 209 GeV process of the $e^+ +e^- \to e^+ + e^- +\mu^+ + \mu^-$ by the
two-photon mechanism. The obtained our results are in satisfactory agreement
with the experimental data.
| [
{
"created": "Sun, 3 May 2020 22:16:45 GMT",
"version": "v1"
}
] | 2020-05-05 | [
[
"Ahmadov",
"A. I.",
""
]
] | In this present paper, we investigate the muon pairs production in the interaction between two quasireal photons in $e^+e^-$ collision. The total and differential cross section of the process $\gamma \gamma \to \mu^+\mu^-$ at a beam energy of photons from 3 GeV to 40 GeV in the center-of-mass and for different values of muon transverse momentum and the muon rapidity and the muon angle are calculated. We also study the total cross section, as a function of the $e^+ e^-$ center-of-mass energy $\sqrt {s}$ in the region 5 GeV $\leq \sqrt {s} \leq$ 209 GeV process of the $e^+ +e^- \to e^+ + e^- +\mu^+ + \mu^-$ by the two-photon mechanism. The obtained our results are in satisfactory agreement with the experimental data. |
hep-ph/0008295 | Bo-Qiang Ma | Bo-Qiang Ma, Ivan Schmidt, Jacques Soffer, and Jian-Jun Yang | The Flavor and Spin Structure of Hyperons from Quark Fragmentation | 32 latex pages, 11 figures, a misprint in Table 1 corrected,
reference updated, to appear in PRD | Phys.Rev. D62 (2000) 114009 | 10.1103/PhysRevD.62.114009 | USM-TH-95, CPT-2000/P.4032 | hep-ph hep-ex nucl-ex nucl-th | null | We systematically study the hadron longitudinal polarizations of the octet
baryons at large $z$ from quark fragmentations in $e^+e^-$-annihilation,
polarized charged lepton deep inelastic scattering (DIS) process, and neutrino
(antineutrino) DIS process, based on predictions of quark distributions for the
octet baryons in the SU(6) quark-spectator-diquark model and a perturbative QCD
based counting rule analysis. We show that the $e^+e^-$-annihilation and
polarized charged lepton DIS process are able to distinguish between the two
different predictions of the hyperon polarizations. We also find that the
neutrino/antineutrino DIS process is ideal in order to study both the valence
content of the hyperons and the antiquark to hyperon (quark to anti-hyperon)
fragmentations, which might be related to the sea content of hyperons.
| [
{
"created": "Tue, 29 Aug 2000 16:04:04 GMT",
"version": "v1"
},
{
"created": "Thu, 31 Aug 2000 14:35:49 GMT",
"version": "v2"
},
{
"created": "Tue, 10 Oct 2000 14:56:12 GMT",
"version": "v3"
}
] | 2009-10-31 | [
[
"Ma",
"Bo-Qiang",
""
],
[
"Schmidt",
"Ivan",
""
],
[
"Soffer",
"Jacques",
""
],
[
"Yang",
"Jian-Jun",
""
]
] | We systematically study the hadron longitudinal polarizations of the octet baryons at large $z$ from quark fragmentations in $e^+e^-$-annihilation, polarized charged lepton deep inelastic scattering (DIS) process, and neutrino (antineutrino) DIS process, based on predictions of quark distributions for the octet baryons in the SU(6) quark-spectator-diquark model and a perturbative QCD based counting rule analysis. We show that the $e^+e^-$-annihilation and polarized charged lepton DIS process are able to distinguish between the two different predictions of the hyperon polarizations. We also find that the neutrino/antineutrino DIS process is ideal in order to study both the valence content of the hyperons and the antiquark to hyperon (quark to anti-hyperon) fragmentations, which might be related to the sea content of hyperons. |
2007.15191 | Robert Foot | Lei Zu, R. Foot, Yi-Zhong Fan, Lei Feng | Plasma dark matter and electronic recoil events in XENON1T | about 6 pages | null | 10.1088/1475-7516/2021/01/070 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Dark matter might be in the form of a dark plasma in the Milky Way halo.
Specifically, we consider here a hidden sector consisting of a light `dark
electron' and a much heavier `dark proton', each charged under an unbroken
$U(1)'$ gauge symmetry. These self-interacting dark sector particles can also
interact with ordinary matter via the kinetic mixing interaction, and lead to a
signal in dark matter direct detection experiments. Indeed, keV electron
recoils can arise quite naturally in such models from dark electron scattering
off loosely bound atomic electrons. Here we examine the recently reported
XENON1T excess in the context of such a plasma dark matter model. We find that
the observed excess can be explained if kinetic mixing is in the approximate
range: $10^{-12} \lesssim \epsilon \lesssim 10^{-10}$. The allowed parameter
space is consistent with astrophysical and cosmological constraints and
consistent also with other direct detection experiments.
| [
{
"created": "Thu, 30 Jul 2020 02:39:22 GMT",
"version": "v1"
}
] | 2021-02-03 | [
[
"Zu",
"Lei",
""
],
[
"Foot",
"R.",
""
],
[
"Fan",
"Yi-Zhong",
""
],
[
"Feng",
"Lei",
""
]
] | Dark matter might be in the form of a dark plasma in the Milky Way halo. Specifically, we consider here a hidden sector consisting of a light `dark electron' and a much heavier `dark proton', each charged under an unbroken $U(1)'$ gauge symmetry. These self-interacting dark sector particles can also interact with ordinary matter via the kinetic mixing interaction, and lead to a signal in dark matter direct detection experiments. Indeed, keV electron recoils can arise quite naturally in such models from dark electron scattering off loosely bound atomic electrons. Here we examine the recently reported XENON1T excess in the context of such a plasma dark matter model. We find that the observed excess can be explained if kinetic mixing is in the approximate range: $10^{-12} \lesssim \epsilon \lesssim 10^{-10}$. The allowed parameter space is consistent with astrophysical and cosmological constraints and consistent also with other direct detection experiments. |
hep-ph/9812226 | Nicolaj Merenkov | M.Konchtnij and N.P.Merenkov (Kharkov Institute of Physics and
Technology) | Current tensor with heavy photon for double hard photon emission by
longitudinally polarized electron | 6p., submitted to JETP Lett | JETP Lett. 69 (1999) 893-899 | 10.1134/1.568108 | null | hep-ph | null | The electron current tensor for the scattering of heavy photon on
longitudinally polarized electron accompanied with two hard real photonsis
considered. The contribution of collinear and semicollinear kinematics is
computed. The obtained result allows to calculate the corresponding
contribution into second order radiative correction to DIS or electron-positron
annihilation cross-sections with the next-to-leading accuracy.
| [
{
"created": "Wed, 2 Dec 1998 12:02:50 GMT",
"version": "v1"
}
] | 2009-10-31 | [
[
"Konchtnij",
"M.",
"",
"Kharkov Institute of Physics and\n Technology"
],
[
"Merenkov",
"N. P.",
"",
"Kharkov Institute of Physics and\n Technology"
]
] | The electron current tensor for the scattering of heavy photon on longitudinally polarized electron accompanied with two hard real photonsis considered. The contribution of collinear and semicollinear kinematics is computed. The obtained result allows to calculate the corresponding contribution into second order radiative correction to DIS or electron-positron annihilation cross-sections with the next-to-leading accuracy. |
1010.1145 | Andreas Maier | K. G. Chetyrkin, A. Maier | Massless correlators of vector, scalar and tensor currents in position
space at orders alpha_s^3 and alpha_s^4: explicit analytical results | 29 pages, 2 figures | Nucl.Phys.B844:266-288,2011 | 10.1016/j.nuclphysb.2010.11.007 | null | hep-ph hep-lat | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present analytical results both in momentum and position space for the
massless correlators of the vector and scalar currents to order alpha_s^4 as
well as for the tensor currents to order alpha_s^3. The evolution equations for
the correlators together with all relevant anomalous dimensions are discussed
in detail. As an application we present explicit conversion formulas relating
the MSbar-renormalized vector, scalar and tensor currents to their counterparts
renormalized in the X-space renormalization scheme more appropriate for lattice
calculations.
| [
{
"created": "Wed, 6 Oct 2010 13:00:50 GMT",
"version": "v1"
}
] | 2011-01-13 | [
[
"Chetyrkin",
"K. G.",
""
],
[
"Maier",
"A.",
""
]
] | We present analytical results both in momentum and position space for the massless correlators of the vector and scalar currents to order alpha_s^4 as well as for the tensor currents to order alpha_s^3. The evolution equations for the correlators together with all relevant anomalous dimensions are discussed in detail. As an application we present explicit conversion formulas relating the MSbar-renormalized vector, scalar and tensor currents to their counterparts renormalized in the X-space renormalization scheme more appropriate for lattice calculations. |
1304.5059 | Pankaj Sharma | Eung Jin Chun and Pankaj Sharma | Same-sign tetra-leptons in type II seesaw at the LHC | 6 pages, 5 figures, proceedings for International Workshop on "Higgs
as a Probe of New Physics 2013 ", Toyama, Japan | null | null | KIAS-PREPRINT-P13025 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In type II seesaw model of neutrino mass generation, we study a remarkable
signal of same-sign tetra-lepton (SS4L) signal at the Large hadron collider.
When doubly charged Higgs is lightest, the heavier singly charged or neutral
Higgs boson produces a doubly charged Higgs boson through its fast gauge decay.
This leads to a novel signature of same-sign tetra-leptons resulting from a
pair production of same-sign doubly charged Higgs bosons. We study production
cross section for the SS4L signal in parameter space of the mass splitting
among triplet components and the triplet vacuum expectation value at the LHC.
| [
{
"created": "Thu, 18 Apr 2013 09:21:56 GMT",
"version": "v1"
}
] | 2013-04-19 | [
[
"Chun",
"Eung Jin",
""
],
[
"Sharma",
"Pankaj",
""
]
] | In type II seesaw model of neutrino mass generation, we study a remarkable signal of same-sign tetra-lepton (SS4L) signal at the Large hadron collider. When doubly charged Higgs is lightest, the heavier singly charged or neutral Higgs boson produces a doubly charged Higgs boson through its fast gauge decay. This leads to a novel signature of same-sign tetra-leptons resulting from a pair production of same-sign doubly charged Higgs bosons. We study production cross section for the SS4L signal in parameter space of the mass splitting among triplet components and the triplet vacuum expectation value at the LHC. |
hep-ph/9612344 | Ralph Engel | F.W. Bopp (Univ. Siegen), R. Engel (Univ. Leipzig and Univ. Siegen),
and A. Rostovtsev (LPNHE Paris Universite Paris VI, and ITEP Moscow) | Hadronic photon interactions at high energies | LaTeX, 6 pages, 6 ps-figs, sprocl.sty, talk given by R. Engel at
"XXVI International Symposium on Multiparticle Dynamics" held in Faro,
Portugal, September 1996 | null | null | SI 96-12 | hep-ph | null | A simple phenomenological introduction to the physics of multi-pomeron
exchange amplitudes in connection with the Abramovski-Gribov-Kancheli (AGK)
cutting rules is given. The AGK cutting rules are applied to obtain qualitative
and quantitative predictions on multiparticle production at high energies. On
this basis, particle production in hadron-hadron scattering, photoproduction,
and in particular the transition to deep-inelastic scattering is discussed.
| [
{
"created": "Thu, 12 Dec 1996 20:21:38 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Bopp",
"F. W.",
"",
"Univ. Siegen"
],
[
"Engel",
"R.",
"",
"Univ. Leipzig and Univ. Siegen"
],
[
"Rostovtsev",
"A.",
"",
"LPNHE Paris Universite Paris VI, and ITEP Moscow"
]
] | A simple phenomenological introduction to the physics of multi-pomeron exchange amplitudes in connection with the Abramovski-Gribov-Kancheli (AGK) cutting rules is given. The AGK cutting rules are applied to obtain qualitative and quantitative predictions on multiparticle production at high energies. On this basis, particle production in hadron-hadron scattering, photoproduction, and in particular the transition to deep-inelastic scattering is discussed. |
0707.1105 | Jose Antonio Martins Simoes | F. M. L. de Almeida Jr., Y. A.Coutinho, J. A. Martins Sim\~oes, A. J.
Ramalho, S. Wulck, M. A. B. do Vale | Right-handed heavy neutrinos in the littlest Higgs model | 9 pages, 4 figures. Revised version | null | null | null | hep-ph | null | In this paper we discuss the consequences of including a new heavy
right-handed neutrino singlet $N_R$ in the littlest Higgs model. This new state
is not connected with the light neutrinos {\it via} the seesaw mechanism. A
very interesting property of this extended model is the full coupling of the
new neutral gauge boson $A_H$ to $N_R$, giving large total cross sections and
suggesting a wide range of experimental search for the $N_R$ at the p p
collider CERN-LHC and future electron-positron collider ILC.
| [
{
"created": "Mon, 9 Jul 2007 16:53:21 GMT",
"version": "v1"
},
{
"created": "Mon, 1 Oct 2007 17:23:27 GMT",
"version": "v2"
}
] | 2007-10-01 | [
[
"Almeida",
"F. M. L. de",
"Jr."
],
[
"Coutinho",
"Y. A.",
""
],
[
"Simões",
"J. A. Martins",
""
],
[
"Ramalho",
"A. J.",
""
],
[
"Wulck",
"S.",
""
],
[
"Vale",
"M. A. B. do",
""
]
] | In this paper we discuss the consequences of including a new heavy right-handed neutrino singlet $N_R$ in the littlest Higgs model. This new state is not connected with the light neutrinos {\it via} the seesaw mechanism. A very interesting property of this extended model is the full coupling of the new neutral gauge boson $A_H$ to $N_R$, giving large total cross sections and suggesting a wide range of experimental search for the $N_R$ at the p p collider CERN-LHC and future electron-positron collider ILC. |
hep-ph/9812358 | Jerome Charles | J. Charles, A. Le Yaouanc, L. Oliver, O. P\`ene, J.-C. Raynal | Heavy-to-Light Form Factors in the Final Hadron Large Energy Limit of
QCD | Latex2e, 25 pages, no figure. Slight changes in the title and the
phrasing. Misprint in Eq. (25) corrected. To appear in Phys. Rev. D | Phys. Rev. D 60, 014001 (1999) | 10.1103/PhysRevD.60.014001 | LPTHE-Orsay 98-77 | hep-ph | null | We argue that the Large Energy Effective Theory (LEET), originally proposed
by Dugan and Grinstein, is applicable to exclusive semileptonic, radiative and
rare heavy-to-light transitions in the region where the energy release E is
large compared to the strong interaction scale and to the mass of the final
hadron, i.e. for q^2 not close to the zero-recoil point. We derive the
Effective Lagrangian from the QCD one, and show that in the limit of heavy mass
M for the initial hadron and large energy E for the final one, the heavy and
light quark fields behave as two-component spinors. Neglecting QCD
short-distance corrections, this implies that there are only three form factors
describing all the pseudoscalar to pseudoscalar or vector weak current matrix
elements. We argue that the dependence of these form factors with respect to M
and E should be factorizable, the M-dependence (sqrt(M)) being derived from the
usual heavy quark expansion while the E-dependence is controlled by the
behaviour of the light-cone distribution amplitude near the end-point u=1. The
usual expectation of the (1-u) behaviour leads to a 1/E^2 scaling law, that is
a dipole form in q^2. We also show explicitly that in the appropriate limit,
the Light-Cone Sum Rule method satisfies our general relations as well as the
scaling laws in M and E of the form factors, and obtain very compact and simple
expressions for the latter. Finally we note that this formalism gives
theoretical support to the quark model-inspired methods existing in the
literature.
| [
{
"created": "Mon, 14 Dec 1998 15:08:41 GMT",
"version": "v1"
},
{
"created": "Mon, 25 Jan 1999 09:50:01 GMT",
"version": "v2"
}
] | 2016-08-25 | [
[
"Charles",
"J.",
""
],
[
"Yaouanc",
"A. Le",
""
],
[
"Oliver",
"L.",
""
],
[
"Pène",
"O.",
""
],
[
"Raynal",
"J. -C.",
""
]
] | We argue that the Large Energy Effective Theory (LEET), originally proposed by Dugan and Grinstein, is applicable to exclusive semileptonic, radiative and rare heavy-to-light transitions in the region where the energy release E is large compared to the strong interaction scale and to the mass of the final hadron, i.e. for q^2 not close to the zero-recoil point. We derive the Effective Lagrangian from the QCD one, and show that in the limit of heavy mass M for the initial hadron and large energy E for the final one, the heavy and light quark fields behave as two-component spinors. Neglecting QCD short-distance corrections, this implies that there are only three form factors describing all the pseudoscalar to pseudoscalar or vector weak current matrix elements. We argue that the dependence of these form factors with respect to M and E should be factorizable, the M-dependence (sqrt(M)) being derived from the usual heavy quark expansion while the E-dependence is controlled by the behaviour of the light-cone distribution amplitude near the end-point u=1. The usual expectation of the (1-u) behaviour leads to a 1/E^2 scaling law, that is a dipole form in q^2. We also show explicitly that in the appropriate limit, the Light-Cone Sum Rule method satisfies our general relations as well as the scaling laws in M and E of the form factors, and obtain very compact and simple expressions for the latter. Finally we note that this formalism gives theoretical support to the quark model-inspired methods existing in the literature. |
1911.04506 | Asier Pi\~neiro Orioli | K. Boguslavski, A. Pi\~neiro Orioli | Unraveling the nature of universal dynamics in $O(N)$ theories | 5+4 pages, 4 figures (published version) | Phys. Rev. D 101, 091902 (2020) | 10.1103/PhysRevD.101.091902 | null | hep-ph cond-mat.quant-gas cond-mat.stat-mech | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Many-body quantum systems far from equilibrium can exhibit universal scaling
dynamics which defy standard classification schemes. Here, we disentangle the
dominant excitations in the universal dynamics of highly-occupied $N$-component
scalar systems using unequal-time correlators. While previous equal-time
studies have conjectured the infrared properties to be universal for all $N$,
we clearly identify for the first time two fundamentally different phenomena
relevant at different $N$. We find all $N\geq3$ to be indeed dominated by the
same Lorentzian ``large-$N$'' peak, whereas $N=1$ is characterized instead by a
non-Lorentzian peak with different properties, and for $N=2$ we see a mixture
of two contributions.
| [
{
"created": "Mon, 11 Nov 2019 19:00:09 GMT",
"version": "v1"
},
{
"created": "Sun, 24 May 2020 18:50:31 GMT",
"version": "v2"
}
] | 2020-05-26 | [
[
"Boguslavski",
"K.",
""
],
[
"Orioli",
"A. Piñeiro",
""
]
] | Many-body quantum systems far from equilibrium can exhibit universal scaling dynamics which defy standard classification schemes. Here, we disentangle the dominant excitations in the universal dynamics of highly-occupied $N$-component scalar systems using unequal-time correlators. While previous equal-time studies have conjectured the infrared properties to be universal for all $N$, we clearly identify for the first time two fundamentally different phenomena relevant at different $N$. We find all $N\geq3$ to be indeed dominated by the same Lorentzian ``large-$N$'' peak, whereas $N=1$ is characterized instead by a non-Lorentzian peak with different properties, and for $N=2$ we see a mixture of two contributions. |
1011.5965 | William Horowitz | W. A. Horowitz | Qualitative and Quantitative Energy Loss? | 5 pages, 6 figures. Proceedings for Hard Probes 2010. Minor changes
from v1 | Nucl.Phys.A855:225-228,2011 | 10.1016/j.nuclphysa.2011.02.045 | INT-PUB-10-066 | hep-ph nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Despite the 300% systematic theoretical uncertainty associated with
extracting qhat using current energy loss models due to the collinear
approximation, and despite the uncertainties in the initial geometry and
corrections due to the fluctuations in the initial overlap of a heavy ion
collision, a simultaneous description of high-pT pi^0 RAA and v2 is not
possible with current pQCD-based energy loss models. However a good description
of out-of-plane RAA as a function of centrality is possible. Alternatively,
energy loss models based on AdS/CFT give a better qualitative description of
pi^0 and non-photonic electron RAA as well as high-pT ratios of antiprotons to
pi^- production than those based on pQCD.
| [
{
"created": "Sat, 27 Nov 2010 11:06:12 GMT",
"version": "v1"
},
{
"created": "Mon, 13 Dec 2010 14:17:45 GMT",
"version": "v2"
}
] | 2011-08-19 | [
[
"Horowitz",
"W. A.",
""
]
] | Despite the 300% systematic theoretical uncertainty associated with extracting qhat using current energy loss models due to the collinear approximation, and despite the uncertainties in the initial geometry and corrections due to the fluctuations in the initial overlap of a heavy ion collision, a simultaneous description of high-pT pi^0 RAA and v2 is not possible with current pQCD-based energy loss models. However a good description of out-of-plane RAA as a function of centrality is possible. Alternatively, energy loss models based on AdS/CFT give a better qualitative description of pi^0 and non-photonic electron RAA as well as high-pT ratios of antiprotons to pi^- production than those based on pQCD. |
hep-ph/9805477 | Francesc Ferrer | F. Ferrer and J.A. Grifols | Long Range Forces from Pseudoscalar Exchange | 27 pages, REVTeX, 3 figures included using epsfig | Phys. Rev. D 58, 096006 (1998) | 10.1103/PhysRevD.58.096006 | UAB-FT-447 | hep-ph | null | Using dispersion theoretic techniques, we consider coherent long range forces
arising from double pseudoscalar exchange among fermions. We find that Yukawa
type coupling leads to $1/r^3$ spin independent attractive potentials whereas
derivative coupling renders $1/r^5$ spin independent repulsive potentials.
| [
{
"created": "Wed, 27 May 1998 10:16:51 GMT",
"version": "v1"
}
] | 2016-08-25 | [
[
"Ferrer",
"F.",
""
],
[
"Grifols",
"J. A.",
""
]
] | Using dispersion theoretic techniques, we consider coherent long range forces arising from double pseudoscalar exchange among fermions. We find that Yukawa type coupling leads to $1/r^3$ spin independent attractive potentials whereas derivative coupling renders $1/r^5$ spin independent repulsive potentials. |
0809.2451 | Subhaditya Bhattacharya | Subhaditya Bhattacharya | Signatures of non-universal gaugino and scalar masses at the Large
Hadron Collider | 3 pages, 10 figures, to appear in the proceedings of SUSY08 | AIP Conf.Proc.1078:277-279,2009 | 10.1063/1.3051933 | HRI-P-08-09-001, HRI-RECAPP-2008-011 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We perform a multichannel analysis in context of the Large Hadron Collider
(LHC) for supersymmetric (SUSY) theories with high-scale non-universal gaugino
masses arising from different non-singlet representations of SU(5) and SO(10)
gauge groups in a SUSY-GUT scenario and non-universal scalar masses in form of
squark-slepton non-universality, third family scalar non-universality and that
arising due to SO(10) $D$-terms. We present the numerical predictions over a
wide region of parameter space using event generator {\tt Pythia}. Certain
broad features emerge from the study which may be useful to identify these
non-universal schemes and distinguish them from the minimal supergravity
(mSUGRA) framework.
| [
{
"created": "Mon, 15 Sep 2008 07:24:58 GMT",
"version": "v1"
}
] | 2009-02-02 | [
[
"Bhattacharya",
"Subhaditya",
""
]
] | We perform a multichannel analysis in context of the Large Hadron Collider (LHC) for supersymmetric (SUSY) theories with high-scale non-universal gaugino masses arising from different non-singlet representations of SU(5) and SO(10) gauge groups in a SUSY-GUT scenario and non-universal scalar masses in form of squark-slepton non-universality, third family scalar non-universality and that arising due to SO(10) $D$-terms. We present the numerical predictions over a wide region of parameter space using event generator {\tt Pythia}. Certain broad features emerge from the study which may be useful to identify these non-universal schemes and distinguish them from the minimal supergravity (mSUGRA) framework. |
0902.3443 | Elsen Veli Veliev | Elsen Veli Veliev, Gulsah Kaya | Leptonic Decay Constants of $D_{s}$ and $B_{s}$ Mesons at Finite
Temperature | 9 pages, 1 table, 4 figures | Eur.Phys.J.C63:87-91,2009 | 10.1140/epjc/s10052-009-1080-5 | null | hep-ph | http://creativecommons.org/licenses/by/3.0/ | In the present work, $D_{s}$ and $B_{s}$ meson parameters are investigated in
the framework of thermal QCD sum rules. The temperature dependence of the mass
and the leptonic decay constants are investigated by using Borel transform sum
rules and Hilbert moment sum rules. To increase sensitivity, the vacuum
contributions are subtracted from thermal expressions and the temperature
dependences of the leptonic decay constants and meson masses are studied.
| [
{
"created": "Thu, 19 Feb 2009 19:51:46 GMT",
"version": "v1"
},
{
"created": "Mon, 23 Feb 2009 17:07:59 GMT",
"version": "v2"
}
] | 2009-11-20 | [
[
"Veliev",
"Elsen Veli",
""
],
[
"Kaya",
"Gulsah",
""
]
] | In the present work, $D_{s}$ and $B_{s}$ meson parameters are investigated in the framework of thermal QCD sum rules. The temperature dependence of the mass and the leptonic decay constants are investigated by using Borel transform sum rules and Hilbert moment sum rules. To increase sensitivity, the vacuum contributions are subtracted from thermal expressions and the temperature dependences of the leptonic decay constants and meson masses are studied. |
hep-ph/9609355 | null | Mou Roy | Neutrino Spin Transitions and the Violation of the Equivalence Principle | Latex, 12 pages, no figures. To appear in Journal of Physics G:
Nuclear and Particle Physics. Two references added | J.Phys.G22:L113-L118,1996 | 10.1088/0954-3899/22/11/001 | UCRHEP-T177 | hep-ph | null | The violation of the equivalence principle (VEP) causing neutrino
oscillations is of current interest. We study here the possibility of not only
flavor oscillation but spin flavor oscillation of ultra high energy ($ \sim$ 1
PeV) neutrinos emanating from AGN due to VEP and due to the presence of a large
magnetic field ($ \sim$ 1 Tesla) in AGN. In particular we look at the resonance
spin flavor conversion driven by the AGN potential. Interesting bounds on the
transition magnetic moment of neutrinos may therefore be obtained.
| [
{
"created": "Fri, 13 Sep 1996 22:44:22 GMT",
"version": "v1"
},
{
"created": "Fri, 20 Sep 1996 18:17:39 GMT",
"version": "v2"
}
] | 2010-12-03 | [
[
"Roy",
"Mou",
""
]
] | The violation of the equivalence principle (VEP) causing neutrino oscillations is of current interest. We study here the possibility of not only flavor oscillation but spin flavor oscillation of ultra high energy ($ \sim$ 1 PeV) neutrinos emanating from AGN due to VEP and due to the presence of a large magnetic field ($ \sim$ 1 Tesla) in AGN. In particular we look at the resonance spin flavor conversion driven by the AGN potential. Interesting bounds on the transition magnetic moment of neutrinos may therefore be obtained. |
1812.08010 | Helmut Eberl Dr. | H. Eberl, K. Hidaka, and E. Ginina | Correlation between the decays $h^0 \to \gamma \gamma/g g$ in the MSSM
with quark flavour violation | Version accepted for publication in IJMPA | null | 10.1142/S0217751X19501203 | HEPHY-PUB 1013/18 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the loop-induced decays $h^0 \to \gamma \, \gamma$ and $h^0 \to g \,
g$ in the Minimal Supersymmetric Standard Model (MSSM) with quark flavour
violation (QFV), identifying $h^0$ with the Higgs boson with a mass of 125 GeV,
where $\gamma$ and $g$ are photon and gluon, respectively. We perform a MSSM
parameter scan and a detailed analysis around a fixed reference point
respecting theoretical constraints from vacuum stability conditions and
experimental constraints, such as those from B meson data and electroweak
precision data, as well as recent limits on supersymmetric (SUSY) particle
masses from LHC experiments. We find that (i) the relative deviation of the
decay width $\Gamma(h^0 \to g \, g)$ from the Standard Model value, $DEV(g)$,
can be large and negative, $\lesssim - 15\%$, (ii) the analogous deviation of
$\Gamma(h^0 \to \gamma \, \gamma)$ is strongly correlated, $DEV(\gamma) \simeq
-1/4\,DEV(g)$ for $DEV(g) \lesssim - 4\%$, (iii) the relative deviation of the
width ratio $\Gamma(h^0 \to \gamma \, \gamma)/\Gamma(h^0 \to g \, g)$ from the
SM value, $DEV(\gamma/g)$, can be large (up to $\sim$ 20\%), (iv) the
deviations can be large due to the up-type squark loop contributions, (v) the
SUSY QFV parameters can have a significant effect on these deviations. Such
large deviations can be observed at a future $e^+e^-$ collider like ILC.
Observation of the deviation patterns as shown in this study would favour the
MSSM with flavour-violating squark mixings and encourage to perform further
studies in this model.
| [
{
"created": "Wed, 19 Dec 2018 15:15:33 GMT",
"version": "v1"
},
{
"created": "Mon, 28 Jan 2019 11:57:56 GMT",
"version": "v2"
},
{
"created": "Wed, 21 Aug 2019 09:50:26 GMT",
"version": "v3"
}
] | 2019-09-04 | [
[
"Eberl",
"H.",
""
],
[
"Hidaka",
"K.",
""
],
[
"Ginina",
"E.",
""
]
] | We study the loop-induced decays $h^0 \to \gamma \, \gamma$ and $h^0 \to g \, g$ in the Minimal Supersymmetric Standard Model (MSSM) with quark flavour violation (QFV), identifying $h^0$ with the Higgs boson with a mass of 125 GeV, where $\gamma$ and $g$ are photon and gluon, respectively. We perform a MSSM parameter scan and a detailed analysis around a fixed reference point respecting theoretical constraints from vacuum stability conditions and experimental constraints, such as those from B meson data and electroweak precision data, as well as recent limits on supersymmetric (SUSY) particle masses from LHC experiments. We find that (i) the relative deviation of the decay width $\Gamma(h^0 \to g \, g)$ from the Standard Model value, $DEV(g)$, can be large and negative, $\lesssim - 15\%$, (ii) the analogous deviation of $\Gamma(h^0 \to \gamma \, \gamma)$ is strongly correlated, $DEV(\gamma) \simeq -1/4\,DEV(g)$ for $DEV(g) \lesssim - 4\%$, (iii) the relative deviation of the width ratio $\Gamma(h^0 \to \gamma \, \gamma)/\Gamma(h^0 \to g \, g)$ from the SM value, $DEV(\gamma/g)$, can be large (up to $\sim$ 20\%), (iv) the deviations can be large due to the up-type squark loop contributions, (v) the SUSY QFV parameters can have a significant effect on these deviations. Such large deviations can be observed at a future $e^+e^-$ collider like ILC. Observation of the deviation patterns as shown in this study would favour the MSSM with flavour-violating squark mixings and encourage to perform further studies in this model. |
0911.4470 | Bj\"orn Schenke | Bjoern Schenke, Charles Gale, Sangyong Jeon | MARTINI - Monte Carlo simulation of jet evolution | 6 pages, 3 figures, presented at the workshop of the ExtreMe Matter
Institute (EMMI) and XXVI Max-Born Symposium `Three Days of Strong
Interactions', Wroclaw, Poland, July 9-11, 2009 | Acta Phys.Polon.Supp.3:765-770,2010 | null | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present the Modular Algorithm for Relativistic Treatment of heavy IoN
Interactions (MARTINI), an event generator for the hard and penetrating probes
in high energy nucleus-nucleus collisions. The simulation consists of a time
evolution model for the soft background, such as hydrodynamics, PYTHIA 8.1 to
generate and hadronize the hard partons after the medium evolution, which is
based on the McGill-AMY formalism and includes both radiative and elastic
processes. MARTINI allows for the generation of full event configurations in
the high transverse momentum region. We present results for the neutral pion
and photon nuclear modification factor in Au+Au collisions at RHIC.
| [
{
"created": "Mon, 23 Nov 2009 19:07:19 GMT",
"version": "v1"
}
] | 2010-11-02 | [
[
"Schenke",
"Bjoern",
""
],
[
"Gale",
"Charles",
""
],
[
"Jeon",
"Sangyong",
""
]
] | We present the Modular Algorithm for Relativistic Treatment of heavy IoN Interactions (MARTINI), an event generator for the hard and penetrating probes in high energy nucleus-nucleus collisions. The simulation consists of a time evolution model for the soft background, such as hydrodynamics, PYTHIA 8.1 to generate and hadronize the hard partons after the medium evolution, which is based on the McGill-AMY formalism and includes both radiative and elastic processes. MARTINI allows for the generation of full event configurations in the high transverse momentum region. We present results for the neutral pion and photon nuclear modification factor in Au+Au collisions at RHIC. |
2109.02586 | Hrishabh Bharadwaj | Hrishabh Bharadwaj, Sukanta Dutta, Ashok Goyal | Leptonic $g-2$ anomaly in an extended Higgs sector with vector-like
leptons | 25 pages, 10 figures | JHEP11(2021)056 | 10.1007/JHEP11(2021)056 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We address the observed discrepancies in the anomalous magnetic dipole
moments (MDM) of the muon and electron by extending the inert two Higgs Doublet
Model (2HDM) with SM gauge singlet complex scalar field and singlet Vector-like
Lepton (VLL) field. We obtain the allowed parameter space constrained from the
Higgs decays to gauge Bosons at LHC, LEP II data and electro-weak precision
measurements. The muon and electron MDM's are then explained within a common
parameter space for different sets of allowed couplings and masses of the model
particles.
| [
{
"created": "Mon, 6 Sep 2021 16:28:45 GMT",
"version": "v1"
},
{
"created": "Tue, 9 Nov 2021 17:04:48 GMT",
"version": "v2"
}
] | 2021-11-10 | [
[
"Bharadwaj",
"Hrishabh",
""
],
[
"Dutta",
"Sukanta",
""
],
[
"Goyal",
"Ashok",
""
]
] | We address the observed discrepancies in the anomalous magnetic dipole moments (MDM) of the muon and electron by extending the inert two Higgs Doublet Model (2HDM) with SM gauge singlet complex scalar field and singlet Vector-like Lepton (VLL) field. We obtain the allowed parameter space constrained from the Higgs decays to gauge Bosons at LHC, LEP II data and electro-weak precision measurements. The muon and electron MDM's are then explained within a common parameter space for different sets of allowed couplings and masses of the model particles. |
1005.3809 | Riccardo Torre | Antonio E. C\'arcamo Hern\'andez and Riccardo Torre | A "composite" scalar-vector system at the LHC | 23 pages, 9 tables, 2 figure. Updated to the published version.
Corrected some typos | Nucl.Phys.B841:188-204,2010 | 10.1016/j.nuclphysb.2010.08.004 | IFUP-TH/2010-17 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In the framework of a strong dynamics for Electro-Weak Symmetry Breaking
(EWSB), both vector and scalar degrees of freedom have been studied in the
literature within an effective Lagrangian approach. Here we consider the case
in which both a scalar, $h$, and a vector, $V$ - respectively an iso-singlet
and an iso-triplet under a custodial SU(2) - are relevant with a mass below the
cut-off $\Lambda \approx 4\pi v$. We study the amplitudes for the processes
$W_L W_L \to W_L W_L, hh, V_{L}V_{L}, V_{L}h$. Requiring unitarity for the
elastic channel $W_L W_L \to W_L W_L$ we can reduce the parameter space to two
free parameters for given masses of the heavy vector and the scalar. We study
the numerical total cross sections for the associated productions $pp\to Vhjj$
by Vector Boson Fusion (VBF) and $pp\to Vh$ by Drell-Yan (DY) annihilation as
functions of these free parameters. The expected rates of same-sign di-lepton
and tri-lepton events from the decay of the $Vh$ final state are also given.
| [
{
"created": "Thu, 20 May 2010 20:00:02 GMT",
"version": "v1"
},
{
"created": "Thu, 27 May 2010 11:44:04 GMT",
"version": "v2"
},
{
"created": "Sat, 3 Dec 2011 12:38:12 GMT",
"version": "v3"
}
] | 2011-12-06 | [
[
"Hernández",
"Antonio E. Cárcamo",
""
],
[
"Torre",
"Riccardo",
""
]
] | In the framework of a strong dynamics for Electro-Weak Symmetry Breaking (EWSB), both vector and scalar degrees of freedom have been studied in the literature within an effective Lagrangian approach. Here we consider the case in which both a scalar, $h$, and a vector, $V$ - respectively an iso-singlet and an iso-triplet under a custodial SU(2) - are relevant with a mass below the cut-off $\Lambda \approx 4\pi v$. We study the amplitudes for the processes $W_L W_L \to W_L W_L, hh, V_{L}V_{L}, V_{L}h$. Requiring unitarity for the elastic channel $W_L W_L \to W_L W_L$ we can reduce the parameter space to two free parameters for given masses of the heavy vector and the scalar. We study the numerical total cross sections for the associated productions $pp\to Vhjj$ by Vector Boson Fusion (VBF) and $pp\to Vh$ by Drell-Yan (DY) annihilation as functions of these free parameters. The expected rates of same-sign di-lepton and tri-lepton events from the decay of the $Vh$ final state are also given. |
0806.2247 | Nejc Ko\v{s}nik | Svjetlana Fajfer, Tri-Nang Pham, Nejc Ko\v{s}nik | On the Dalitz plot analysis of the B --> K eta gamma decays | 8 pages, 4 figures | Phys.Rev.D78:074013,2008 | 10.1103/PhysRevD.78.074013 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Recently B-factories have published new results on the $B \to K \eta \gamma$
decays being inspired by the theoretical suggestion to search for new physics
in $B \to P_1 P_2 \gamma$ decays. Using heavy meson chiral perturbation theory
we find mechanism which governs the amplitude in parts of the Dalitz plot where
either $K$ or $\eta$ mesons are soft. The dominant contributions in these cases
are coming from the nonresonant decay modes. We discuss also $B \to K \eta'
\gamma$ Dalitz plot. Our partially integrated rates are in agreement with the
experimental findings.
| [
{
"created": "Fri, 13 Jun 2008 13:24:44 GMT",
"version": "v1"
},
{
"created": "Mon, 16 Jun 2008 10:46:32 GMT",
"version": "v2"
},
{
"created": "Tue, 1 Jul 2008 13:49:42 GMT",
"version": "v3"
}
] | 2008-11-26 | [
[
"Fajfer",
"Svjetlana",
""
],
[
"Pham",
"Tri-Nang",
""
],
[
"Košnik",
"Nejc",
""
]
] | Recently B-factories have published new results on the $B \to K \eta \gamma$ decays being inspired by the theoretical suggestion to search for new physics in $B \to P_1 P_2 \gamma$ decays. Using heavy meson chiral perturbation theory we find mechanism which governs the amplitude in parts of the Dalitz plot where either $K$ or $\eta$ mesons are soft. The dominant contributions in these cases are coming from the nonresonant decay modes. We discuss also $B \to K \eta' \gamma$ Dalitz plot. Our partially integrated rates are in agreement with the experimental findings. |
hep-ph/0408003 | Alexander E. Dorokhov | A.E. Dorokhov | Vector and Axial-Vector correlators in a instanton-like quark model | 3 pages, 2 figures. Talk given at MESON 2004: 8th International
Workshop on Meson Production, Properties and Interactions, Cracow, Poland,
4-8 Jun 2004 | Int.J.Mod.Phys. A20 (2005) 631-633 | 10.1142/S0217751X05021993 | null | hep-ph | null | The behavior of the vector Adler function at spacelike momenta is studied in
the framework of a covariant chiral quark model with instanton-like quark-quark
interaction. The model reproduces the Adler function and $V-A$ correlator
extracted from the ALEPH and OPAL data on hadronic $\tau$ lepton decays,
transformed into the Euclidean domain via dispersion relations. The leading
order contribution from hadronic part of the photon vacuum polarization to the
anomalous magnetic moment of the muon, $a_{\mu}^{\mathrm{hvp}(1)} $, is
estimated.
| [
{
"created": "Sat, 31 Jul 2004 10:13:39 GMT",
"version": "v1"
},
{
"created": "Wed, 29 Dec 2004 07:11:31 GMT",
"version": "v2"
}
] | 2009-11-10 | [
[
"Dorokhov",
"A. E.",
""
]
] | The behavior of the vector Adler function at spacelike momenta is studied in the framework of a covariant chiral quark model with instanton-like quark-quark interaction. The model reproduces the Adler function and $V-A$ correlator extracted from the ALEPH and OPAL data on hadronic $\tau$ lepton decays, transformed into the Euclidean domain via dispersion relations. The leading order contribution from hadronic part of the photon vacuum polarization to the anomalous magnetic moment of the muon, $a_{\mu}^{\mathrm{hvp}(1)} $, is estimated. |
hep-ph/9808253 | Robert Delbourgo | R Delbourgo, Dongsheng Liu, M D Scadron | Electromagnetic properties of hadrons via the $u-d$ mass difference and
direct photon exchange | 14 pages, RevTeX. Replacement includes $a_0$ tadpole contribution. To
appear in Phys Rev D | Phys.Rev.D59:113006,1999 | 10.1103/PhysRevD.59.113006 | UTAS-PHYS-98-09 | hep-ph | null | We demonstrate that a $u-d$ mass difference (which we estimate to be about 4
MeV) within quantum loops, can reproduce the effects of the Coleman-Glashow
electromagnetic tadpole operator.
| [
{
"created": "Fri, 7 Aug 1998 02:07:26 GMT",
"version": "v1"
},
{
"created": "Tue, 23 Feb 1999 00:22:57 GMT",
"version": "v2"
},
{
"created": "Tue, 23 Feb 1999 23:27:49 GMT",
"version": "v3"
}
] | 2008-11-26 | [
[
"Delbourgo",
"R",
""
],
[
"Liu",
"Dongsheng",
""
],
[
"Scadron",
"M D",
""
]
] | We demonstrate that a $u-d$ mass difference (which we estimate to be about 4 MeV) within quantum loops, can reproduce the effects of the Coleman-Glashow electromagnetic tadpole operator. |
0803.3412 | Qiang Zhao | Gang Li, Yuan-Jiang Zhang and Qiang Zhao | Study of isospin violating $\phi$ excitation in $e^+e^- \to \omega\pi^0$ | Revised version to appear in J. Phys. G | null | 10.1088/0954-3899/36/8/085008 | null | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the reaction $e^+ e^-\to \omega\pi^0$ in the vicinity of $\phi$ mass
region. The isospin-violating $\phi$ excitation is accounted for by two major
mechanisms. One is electromagnetic (EM) transition and the other is strong
isospin violations. For the latter, we consider contributions from the
intermediate hadronic meson loops and $\phi$-$\rho^0$ mixing as the major
mechanisms via the $t$ and s-channel transitions, respectively. By fitting the
recent KLOE data, we succeed in constraining the model parameters and
extracting the $\phi\to\omega\pi^0$ branching ratio. It shows that the
branching ratio is sensitive to the $\phi$ excitation line shape and background
contributions. Some crucial insights into the correlation between isospin
violation and Okubo-Zweig-Iizuka (OZI) rule evading transitions are also
learned.
| [
{
"created": "Mon, 24 Mar 2008 14:50:18 GMT",
"version": "v1"
},
{
"created": "Tue, 25 Mar 2008 15:48:23 GMT",
"version": "v2"
},
{
"created": "Wed, 2 Apr 2008 06:31:09 GMT",
"version": "v3"
},
{
"created": "Mon, 12 May 2008 13:19:57 GMT",
"version": "v4"
},
{
"created": "Sat, 14 Mar 2009 17:00:29 GMT",
"version": "v5"
},
{
"created": "Tue, 30 Jun 2009 02:49:43 GMT",
"version": "v6"
}
] | 2015-05-13 | [
[
"Li",
"Gang",
""
],
[
"Zhang",
"Yuan-Jiang",
""
],
[
"Zhao",
"Qiang",
""
]
] | We study the reaction $e^+ e^-\to \omega\pi^0$ in the vicinity of $\phi$ mass region. The isospin-violating $\phi$ excitation is accounted for by two major mechanisms. One is electromagnetic (EM) transition and the other is strong isospin violations. For the latter, we consider contributions from the intermediate hadronic meson loops and $\phi$-$\rho^0$ mixing as the major mechanisms via the $t$ and s-channel transitions, respectively. By fitting the recent KLOE data, we succeed in constraining the model parameters and extracting the $\phi\to\omega\pi^0$ branching ratio. It shows that the branching ratio is sensitive to the $\phi$ excitation line shape and background contributions. Some crucial insights into the correlation between isospin violation and Okubo-Zweig-Iizuka (OZI) rule evading transitions are also learned. |
1702.05106 | Sylvain Fichet | Felipe Ferreira, Sylvain Fichet, Veronica Sanz | On new physics searches with multidimensional differential shapes | 8 pages, 5 figures | null | 10.1016/j.physletb.2018.01.008 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In the context of upcoming new physics searches at the LHC, we investigate
the impact of multidimensional differential rates in typical LHC analyses. We
discuss the properties of shape information, and argue that multidimensional
rates bring limited information in the scope of a discovery, but can have a
large impact on model discrimination. We also point out subtleties about
systematic uncertainties cancellations and the Cauchy-Schwarz bound on
interference terms.
| [
{
"created": "Thu, 16 Feb 2017 19:01:25 GMT",
"version": "v1"
}
] | 2018-02-01 | [
[
"Ferreira",
"Felipe",
""
],
[
"Fichet",
"Sylvain",
""
],
[
"Sanz",
"Veronica",
""
]
] | In the context of upcoming new physics searches at the LHC, we investigate the impact of multidimensional differential rates in typical LHC analyses. We discuss the properties of shape information, and argue that multidimensional rates bring limited information in the scope of a discovery, but can have a large impact on model discrimination. We also point out subtleties about systematic uncertainties cancellations and the Cauchy-Schwarz bound on interference terms. |
0811.1066 | Eduardo Rojas | Eduardo Rojas | Radiative and non-perturbative corrections to the electron mass and the
anomalous magnetic moment in the presence of an external magnetic field of
arbitrary strength | 5 pages, 4 figures | null | null | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Using the Ritus eingenfunction method we compute corrections to the electron
mass m_{0} in the presence of a moderate magnetic field eB ~ m_0^2. From this
we obtain an expression for the anomalous magnetic moment near the critic
field. For this we solved numerically the Schwinger-Dyson equations in the
rainbow approximation including all Landau levels without make any assumption
respect to the field strength.
| [
{
"created": "Fri, 7 Nov 2008 03:31:53 GMT",
"version": "v1"
},
{
"created": "Wed, 24 Dec 2008 18:14:56 GMT",
"version": "v2"
}
] | 2008-12-24 | [
[
"Rojas",
"Eduardo",
""
]
] | Using the Ritus eingenfunction method we compute corrections to the electron mass m_{0} in the presence of a moderate magnetic field eB ~ m_0^2. From this we obtain an expression for the anomalous magnetic moment near the critic field. For this we solved numerically the Schwinger-Dyson equations in the rainbow approximation including all Landau levels without make any assumption respect to the field strength. |
2105.02662 | Yuri Shtanov | Yuri Shtanov | Light scalaron as dark matter | 13 pages, references added, discussion extended, version accepted for
publication in Phys. Lett. B | Phys. Lett. B 820 (2021) 136469 | 10.1016/j.physletb.2021.136469 | null | hep-ph astro-ph.CO gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A new cosmological scenario is proposed in which a light scalaron of $f (R)$
gravity plays the role of dark matter. In this scenario, the scalaron initially
resides at the minimum of its effective potential while the electroweak
symmetry is unbroken. At the beginning of the electroweak crossover, the
evolving expectation value of the Higgs field triggers the evolution of the
scalaron due to interaction between these fields. After the electroweak
crossover, the oscillating scalaron can represent cold dark matter. Its current
energy density depends on a single free parameter, the scalaron mass $m$, and
the value $m \simeq 4 \times 10^{-3}\, \text{eV}$ is required to explain the
observed dark-matter abundance. Larger mass values would be required in
scenarios where the scalaron is excited before the electroweak crossover.
| [
{
"created": "Thu, 6 May 2021 13:44:15 GMT",
"version": "v1"
},
{
"created": "Thu, 20 May 2021 06:26:18 GMT",
"version": "v2"
},
{
"created": "Mon, 21 Jun 2021 12:26:28 GMT",
"version": "v3"
}
] | 2021-07-02 | [
[
"Shtanov",
"Yuri",
""
]
] | A new cosmological scenario is proposed in which a light scalaron of $f (R)$ gravity plays the role of dark matter. In this scenario, the scalaron initially resides at the minimum of its effective potential while the electroweak symmetry is unbroken. At the beginning of the electroweak crossover, the evolving expectation value of the Higgs field triggers the evolution of the scalaron due to interaction between these fields. After the electroweak crossover, the oscillating scalaron can represent cold dark matter. Its current energy density depends on a single free parameter, the scalaron mass $m$, and the value $m \simeq 4 \times 10^{-3}\, \text{eV}$ is required to explain the observed dark-matter abundance. Larger mass values would be required in scenarios where the scalaron is excited before the electroweak crossover. |
hep-ph/0410342 | Grigori Vartanov | D.I.Kazakov and G.S.Vartanov | On High Energy Scattering in Extra Dimensions | Latex, 9 pages, 2 eps figures | Theor.Math.Phys. 147 (2006) 533-540; Teor.Mat.Fiz. 147 (2006)
103-112 | null | null | hep-ph hep-th | null | We analyze the behaviour of the high-energy scattering amplitude within the
brane world scenario in extra dimensions. We argue that contrary to the popular
opinion based on the Kaluza-Klein approach, the cross-section does not increase
with energy, but changes the slope close to the compactification scale and then
decreases like in the 4-dimensional theory. A particular example of the
quark-antiquark scattering due to the gluon exchange in the bulk is considered.
| [
{
"created": "Tue, 26 Oct 2004 08:38:11 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Kazakov",
"D. I.",
""
],
[
"Vartanov",
"G. S.",
""
]
] | We analyze the behaviour of the high-energy scattering amplitude within the brane world scenario in extra dimensions. We argue that contrary to the popular opinion based on the Kaluza-Klein approach, the cross-section does not increase with energy, but changes the slope close to the compactification scale and then decreases like in the 4-dimensional theory. A particular example of the quark-antiquark scattering due to the gluon exchange in the bulk is considered. |
1512.01243 | Heather E. Logan | Celine Degrande, Katy Hartling, Heather E. Logan, Andrea D. Peterson,
and Marco Zaro | Automatic predictions in the Georgi-Machacek model at next-to-leading
order accuracy | 16 pages, 3 figures | Phys. Rev. D 93, 035004 (2016) | 10.1103/PhysRevD.93.035004 | IPPP/15/72, DCPT/15/144, MCnet-15-34 | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the phenomenology of the Georgi-Machacek model at next-to-leading
order (NLO) in QCD matched to parton shower, using a fully-automated tool chain
based on MadGraph5_aMC@NLO and FeynRules. We focus on the production of the
fermiophobic custodial fiveplet scalars H_5^0, H_5^+/-, and H_5^++/-- through
vector boson fusion (VBF), associated production with a vector boson (V H_5),
and scalar pair production (H_5 H_5). For these production mechanisms we
compute NLO corrections to production rates as well as to differential
distributions. Our results demonstrate that the Standard Model (SM) overall
K-factors for such processes cannot in general be directly applied to
beyond-the-SM distributions, due both to differences in the scalar electroweak
charges and to variation of the K-factors over the differential distributions.
| [
{
"created": "Thu, 3 Dec 2015 21:03:31 GMT",
"version": "v1"
}
] | 2016-02-10 | [
[
"Degrande",
"Celine",
""
],
[
"Hartling",
"Katy",
""
],
[
"Logan",
"Heather E.",
""
],
[
"Peterson",
"Andrea D.",
""
],
[
"Zaro",
"Marco",
""
]
] | We study the phenomenology of the Georgi-Machacek model at next-to-leading order (NLO) in QCD matched to parton shower, using a fully-automated tool chain based on MadGraph5_aMC@NLO and FeynRules. We focus on the production of the fermiophobic custodial fiveplet scalars H_5^0, H_5^+/-, and H_5^++/-- through vector boson fusion (VBF), associated production with a vector boson (V H_5), and scalar pair production (H_5 H_5). For these production mechanisms we compute NLO corrections to production rates as well as to differential distributions. Our results demonstrate that the Standard Model (SM) overall K-factors for such processes cannot in general be directly applied to beyond-the-SM distributions, due both to differences in the scalar electroweak charges and to variation of the K-factors over the differential distributions. |
2111.03031 | Pablo Mart\'inez-Mirav\'e | P. Mart\'inez-Mirav\'e, S. Molina Sedgwick, M.T\'ortola | Non-standard interactions from the future neutrino solar sector | 22 pages, 10 figures, 2 tables. Matches published version | null | 10.1103/PhysRevD.105.035004 | null | hep-ph hep-ex | http://creativecommons.org/licenses/by/4.0/ | The next-generation neutrino experiment JUNO will determine the solar
oscillation parameters - $\sin^2 \theta_{12}$ and $\Delta m^2_{21}$ - with
great accuracy, in addition to measuring $\sin^2\theta_{13}$, $\Delta
m^2_{31}$, and the mass ordering. In parallel, the continued study of solar
neutrinos at Hyper-Kamiokande will provide complementary measurements in the
solar sector. In this paper, we address the expected sensitivity to
non-universal and flavour-changing non-standard interactions (NSI) with
$d$-type quarks from the combination of these two future neutrino experiments.
We also show the robustness of their measurements of the solar parameters
$\sin^2 \theta_{12}$ and $\Delta m^2_{21}$ in the presence of NSI. We study the
impact of the exact experimental configuration of the Hyper-Kamiokande
detector, and conclude it is of little relevance in this scenario. Finally, we
find that the LMA-D solution is expected to be present if no additional input
from non-oscillation experiments is considered.
| [
{
"created": "Thu, 4 Nov 2021 17:35:10 GMT",
"version": "v1"
},
{
"created": "Thu, 12 May 2022 09:59:56 GMT",
"version": "v2"
}
] | 2022-05-13 | [
[
"Martínez-Miravé",
"P.",
""
],
[
"Sedgwick",
"S. Molina",
""
],
[
"Tórtola",
"M.",
""
]
] | The next-generation neutrino experiment JUNO will determine the solar oscillation parameters - $\sin^2 \theta_{12}$ and $\Delta m^2_{21}$ - with great accuracy, in addition to measuring $\sin^2\theta_{13}$, $\Delta m^2_{31}$, and the mass ordering. In parallel, the continued study of solar neutrinos at Hyper-Kamiokande will provide complementary measurements in the solar sector. In this paper, we address the expected sensitivity to non-universal and flavour-changing non-standard interactions (NSI) with $d$-type quarks from the combination of these two future neutrino experiments. We also show the robustness of their measurements of the solar parameters $\sin^2 \theta_{12}$ and $\Delta m^2_{21}$ in the presence of NSI. We study the impact of the exact experimental configuration of the Hyper-Kamiokande detector, and conclude it is of little relevance in this scenario. Finally, we find that the LMA-D solution is expected to be present if no additional input from non-oscillation experiments is considered. |
hep-ph/9905221 | Lisa Randall | Lisa Randall, Raman Sundrum | A Large Mass Hierarchy from a Small Extra Dimension | 9 pages, LaTex | Phys.Rev.Lett.83:3370-3373,1999 | 10.1103/PhysRevLett.83.3370 | MIT-CTP-2860, PUPT-1860, BUHEP-99-9 | hep-ph hep-th | null | We propose a new higher-dimensional mechanism for solving the Hierarchy
Problem. The Weak scale is generated from a large scale of order the Planck
scale through an exponential hierarchy. However, this exponential arises not
from gauge interactions but from the background metric (which is a slice of
AdS_5 spacetime). This mechanism relies on the existence of only a single
additional dimension. We demonstrate a simple explicit example of this
mechanism with two three-branes, one of which contains the Standard Model
fields. The experimental consequences of this scenario are new and dramatic.
There are fundamental spin-2 excitations with mass of weak scale order, which
are coupled with weak scale as opposed to gravitational strength to the
standard model particles. The phenomenology of these models is quite distinct
from that of large extra dimension scenarios; none of the current constraints
on theories with very large extra dimensions apply.
| [
{
"created": "Tue, 4 May 1999 01:43:58 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Randall",
"Lisa",
""
],
[
"Sundrum",
"Raman",
""
]
] | We propose a new higher-dimensional mechanism for solving the Hierarchy Problem. The Weak scale is generated from a large scale of order the Planck scale through an exponential hierarchy. However, this exponential arises not from gauge interactions but from the background metric (which is a slice of AdS_5 spacetime). This mechanism relies on the existence of only a single additional dimension. We demonstrate a simple explicit example of this mechanism with two three-branes, one of which contains the Standard Model fields. The experimental consequences of this scenario are new and dramatic. There are fundamental spin-2 excitations with mass of weak scale order, which are coupled with weak scale as opposed to gravitational strength to the standard model particles. The phenomenology of these models is quite distinct from that of large extra dimension scenarios; none of the current constraints on theories with very large extra dimensions apply. |
hep-ph/0206311 | Rohini M. Godbole | F. Boudjema, G. B\'elanger and R.M. Godbole | Invisible Decays of the Supersymmetric Higgs and Dark Matter | 17 pages, 11 figures, Talk presented at Appi2002, Accelerator and
Particle Physics Institute, Appi, Iwate, Japan, February 13--16 2002 | null | null | CERN-TH/20002-141, LAPTH-Conf-919 | hep-ph | null | We discuss effects of the light sparticles on decays of the lightest Higgs in
a supersymmetric model with nonuniversal gaugino masses at the high scale,
focusing on the `invisible' decays into neutralinos. These can impact
significanlty the discovery possibilities of the lightest Higgs at the LHC. We
show that due to these decays, there exist regions of the $M_2-\mu$ space where
the B.R. $(h \to \gamma \gamma)$ becomes dangerously low even after imposing
the LEP constraints on the sparticle masses, implying a possible preclusion of
its discovery in the $\gamma \gamma$ channel. We find that there exist regions
in the parameter space with acceptable relic density and where the ratio ${B.R.
(h \to \gamma \gamma)_{SUSY} \over B.R. (h \to \gamma \gamma)_{SM}}$ falls
below 0.6, implying loss of signal in the $\gamma \gamma$ channel. These
regions correspond to $\tilde \chi_1^+, \tilde \chi_2^0$ masses which should be
accessible already at the Tevatron. Further we find that considerations of
relic density put lower limit on the U(1) gaugino mass parameter $M_1$
independently of $\mu, \tan \beta$ and $m_0$.
| [
{
"created": "Fri, 28 Jun 2002 17:11:22 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Boudjema",
"F.",
""
],
[
"Bélanger",
"G.",
""
],
[
"Godbole",
"R. M.",
""
]
] | We discuss effects of the light sparticles on decays of the lightest Higgs in a supersymmetric model with nonuniversal gaugino masses at the high scale, focusing on the `invisible' decays into neutralinos. These can impact significanlty the discovery possibilities of the lightest Higgs at the LHC. We show that due to these decays, there exist regions of the $M_2-\mu$ space where the B.R. $(h \to \gamma \gamma)$ becomes dangerously low even after imposing the LEP constraints on the sparticle masses, implying a possible preclusion of its discovery in the $\gamma \gamma$ channel. We find that there exist regions in the parameter space with acceptable relic density and where the ratio ${B.R. (h \to \gamma \gamma)_{SUSY} \over B.R. (h \to \gamma \gamma)_{SM}}$ falls below 0.6, implying loss of signal in the $\gamma \gamma$ channel. These regions correspond to $\tilde \chi_1^+, \tilde \chi_2^0$ masses which should be accessible already at the Tevatron. Further we find that considerations of relic density put lower limit on the U(1) gaugino mass parameter $M_1$ independently of $\mu, \tan \beta$ and $m_0$. |
hep-ph/9909231 | John F. Beacom | J.F. Beacom (Caltech) | Neutrinos From the Next Galactic Supernova | Invited talk at the 23rd Johns Hopkins Workshop on Current Problems
in Particle Theory: Neutrinos in the Next Millennium (Baltimore, June 1999).
27 pages with 6 included figures | null | null | null | hep-ph astro-ph hep-ex nucl-ex nucl-th | null | The next core-collapse supernova in our Galaxy will be a spectacular event,
with some $10^4$ neutrino detections in total expected among several detectors.
This data will allow unprecedented tests of neutrino properties and new
opportunities in astrophysics. In this paper, I focus on two main topics: (1)
Measurement of the $\nu_\mu$ and $\nu_\tau$ masses by time-of-flight, with an
emphasis on introducing as little supernova model dependence as possible, and
(2) Methods for locating a supernova by its neutrinos in advance of the light,
which may allow improved astronomical observations. In the latter, I also
discuss the recent result that the positrons from $\bar{\nu}_e + p \to e^+ + n$
are not isotropically emitted, as commonly thought.
| [
{
"created": "Thu, 2 Sep 1999 17:49:39 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Beacom",
"J. F.",
"",
"Caltech"
]
] | The next core-collapse supernova in our Galaxy will be a spectacular event, with some $10^4$ neutrino detections in total expected among several detectors. This data will allow unprecedented tests of neutrino properties and new opportunities in astrophysics. In this paper, I focus on two main topics: (1) Measurement of the $\nu_\mu$ and $\nu_\tau$ masses by time-of-flight, with an emphasis on introducing as little supernova model dependence as possible, and (2) Methods for locating a supernova by its neutrinos in advance of the light, which may allow improved astronomical observations. In the latter, I also discuss the recent result that the positrons from $\bar{\nu}_e + p \to e^+ + n$ are not isotropically emitted, as commonly thought. |
1808.08179 | Andrei Angelescu | Andrei Angelescu, Damir Be\v{c}irevi\'c, Darius A. Faroughy and Olcyr
Sumensari | Closing the window on single leptoquark solutions to the $B$-physics
anomalies | 33 pages, 10 figures; v3: Version to appear in JHEP | null | 10.1007/JHEP10(2018)183 | LPT-Orsay-18-81 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We examine various scenarios in which the Standard Model is extended by a
light leptoquark state to solve for one or both $B$-physics anomalies, viz.
$R_{D^{(\ast)}}^\mathrm{exp}> R_{D^{(\ast)}}^\mathrm{SM}$ or/and
$R_{K^{(\ast)}}^\mathrm{exp}< R_{K^{(\ast)}}^\mathrm{SM}$. To do so we combine
the constraints arising both from the low-energy observables and from direct
searches at the LHC. We find that none of the scalar leptoquarks of mass
$m_\mathrm{LQ} \simeq 1$ TeV can alone accommodate the above mentioned
anomalies. The only single leptoquark scenario which can provide a viable
solution for $m_\mathrm{LQ} \simeq 1\div 2$ TeV is a vector leptoquark, known
as $U_1$, which we re-examine in its minimal form (letting only left-handed
couplings to have non-zero values). We find that the limits deduced from direct
searches are complementary to the low-energy physics constraints. In
particular, we find a rather stable lower bound on the lepton flavor violating
$b\to s\ell_1^\pm\ell_2^\mp$ modes, such as $\mathcal{B}(B\to K\mu\tau)$.
Improving the experimental upper bound on $\mathcal{B}(B\to K\mu\tau)$ by two
orders of magnitude could compromise the viability of the minimal $U_1$ model
as well.
| [
{
"created": "Fri, 24 Aug 2018 15:44:00 GMT",
"version": "v1"
},
{
"created": "Tue, 4 Sep 2018 19:59:51 GMT",
"version": "v2"
},
{
"created": "Wed, 24 Oct 2018 16:40:41 GMT",
"version": "v3"
}
] | 2018-11-14 | [
[
"Angelescu",
"Andrei",
""
],
[
"Bečirević",
"Damir",
""
],
[
"Faroughy",
"Darius A.",
""
],
[
"Sumensari",
"Olcyr",
""
]
] | We examine various scenarios in which the Standard Model is extended by a light leptoquark state to solve for one or both $B$-physics anomalies, viz. $R_{D^{(\ast)}}^\mathrm{exp}> R_{D^{(\ast)}}^\mathrm{SM}$ or/and $R_{K^{(\ast)}}^\mathrm{exp}< R_{K^{(\ast)}}^\mathrm{SM}$. To do so we combine the constraints arising both from the low-energy observables and from direct searches at the LHC. We find that none of the scalar leptoquarks of mass $m_\mathrm{LQ} \simeq 1$ TeV can alone accommodate the above mentioned anomalies. The only single leptoquark scenario which can provide a viable solution for $m_\mathrm{LQ} \simeq 1\div 2$ TeV is a vector leptoquark, known as $U_1$, which we re-examine in its minimal form (letting only left-handed couplings to have non-zero values). We find that the limits deduced from direct searches are complementary to the low-energy physics constraints. In particular, we find a rather stable lower bound on the lepton flavor violating $b\to s\ell_1^\pm\ell_2^\mp$ modes, such as $\mathcal{B}(B\to K\mu\tau)$. Improving the experimental upper bound on $\mathcal{B}(B\to K\mu\tau)$ by two orders of magnitude could compromise the viability of the minimal $U_1$ model as well. |
hep-ph/0209075 | F. A. Chishtie | M.R. Ahmady, F.A. Chishtie, V. Elias, A.H. Fariborz, D.G.C. McKeon,
T.N. Sherry, T.G. Steele | Pade/renormalization-group improvement of inclusive semileptonic B decay
rates | 3 pages, latex using espcrc2.sty. Write-up of talk given at BEACH
2002, UBC, Vancouver | Nucl.Phys.Proc.Suppl. 115 (2003) 82-84 | 10.1016/S0920-5632(02)01958-8 | null | hep-ph | null | Renormalization Group (RG) and optimized Pade-approximant methods are used to
estimate the three-loop perturbative contributions to the inclusive
semileptonic b \to u and b \to c decay rates. It is noted that the \bar{MS}
scheme works favorably in the b \to u case whereas the pole mass scheme shows
better convergence in the b \to c case. Upon the inclusion of the estimated
three-loop contribution, we find the full perturbative decay rate to be
192\pi^3\Gamma(b\to u\bar\nu_\ell\ell^-)/(G_F^2| V_{ub}|^2) = 2065 \pm 290{\rm
GeV^5} and 192\pi^3\Gamma(b\to c\ell^-\bar\nu_\ell)/(G_F^2|V_{cb}|^2)= 992 \pm
198 {\rm GeV^5}, respectively. The errors are inclusive of theoretical
uncertainties and non-perturbative effects. Ultimately, these perturbative
contributions reduce the theoretical uncertainty in the extraction of the CKM
matrix elements |V_{ub}| and |V_{cb}| from their respective measured inclusive
semileptonic branching ratio(s).
| [
{
"created": "Fri, 6 Sep 2002 17:30:12 GMT",
"version": "v1"
}
] | 2009-11-07 | [
[
"Ahmady",
"M. R.",
""
],
[
"Chishtie",
"F. A.",
""
],
[
"Elias",
"V.",
""
],
[
"Fariborz",
"A. H.",
""
],
[
"McKeon",
"D. G. C.",
""
],
[
"Sherry",
"T. N.",
""
],
[
"Steele",
"T. G.",
""
]
] | Renormalization Group (RG) and optimized Pade-approximant methods are used to estimate the three-loop perturbative contributions to the inclusive semileptonic b \to u and b \to c decay rates. It is noted that the \bar{MS} scheme works favorably in the b \to u case whereas the pole mass scheme shows better convergence in the b \to c case. Upon the inclusion of the estimated three-loop contribution, we find the full perturbative decay rate to be 192\pi^3\Gamma(b\to u\bar\nu_\ell\ell^-)/(G_F^2| V_{ub}|^2) = 2065 \pm 290{\rm GeV^5} and 192\pi^3\Gamma(b\to c\ell^-\bar\nu_\ell)/(G_F^2|V_{cb}|^2)= 992 \pm 198 {\rm GeV^5}, respectively. The errors are inclusive of theoretical uncertainties and non-perturbative effects. Ultimately, these perturbative contributions reduce the theoretical uncertainty in the extraction of the CKM matrix elements |V_{ub}| and |V_{cb}| from their respective measured inclusive semileptonic branching ratio(s). |
hep-ph/0411178 | Daniel T. Larson | Daniel T. Larson, Hitoshi Murayama, and Gilad Perez | Right-Handed New Physics Remains Strangely Beautiful | 7 pages, 9 figures; published version: added 1 reference and 1
clarification | JHEP 0507:057,2005 | 10.1088/1126-6708/2005/07/057 | LBNL-56620, UCB-PTH-04/31 | hep-ph | null | Current data on CP violation in B_d -> eta' K_S and B_d -> phi K_S, taken
literally, suggest new physics contributions in b -> s transitions. Despite a
claim to the contrary, we point out that right-handed operators with a single
weak phase can account for both deviations thanks to the two-fold ambiguity in
the extraction of the weak phase from the corresponding CP-asymmetry. This
observation is welcome since large mixing in the right-handed sector is favored
by many GUT models and frameworks which address the flavor puzzle. There are
also interesting correlations with the B_s system which provide a way to test
this scenario in the near future.
| [
{
"created": "Fri, 12 Nov 2004 21:03:54 GMT",
"version": "v1"
},
{
"created": "Thu, 11 Aug 2005 12:15:21 GMT",
"version": "v2"
}
] | 2009-11-10 | [
[
"Larson",
"Daniel T.",
""
],
[
"Murayama",
"Hitoshi",
""
],
[
"Perez",
"Gilad",
""
]
] | Current data on CP violation in B_d -> eta' K_S and B_d -> phi K_S, taken literally, suggest new physics contributions in b -> s transitions. Despite a claim to the contrary, we point out that right-handed operators with a single weak phase can account for both deviations thanks to the two-fold ambiguity in the extraction of the weak phase from the corresponding CP-asymmetry. This observation is welcome since large mixing in the right-handed sector is favored by many GUT models and frameworks which address the flavor puzzle. There are also interesting correlations with the B_s system which provide a way to test this scenario in the near future. |
hep-ph/9212273 | null | H. A. Riggs and H. J. Schnitzer | CP-Violating Yukawa Couplings in the Skyrme Model and the Neutron
Electric Dipole Moment | 12 pages, Latex with no macros, BRX-TH-338 | Phys.Lett.B305:252-260,1993 | 10.1016/0370-2693(93)90115-X | null | hep-ph | null | We argue that the large-$\Nc$ behaviour of the Yukawa couplings in the Skyrme
model involves issues more subtle than the vanishing of linear fluctuations
needed for classical stability of the skyrmion. The chiral fluctuations about
the skyrmion must be quantized in order to reach a conclusion. An improved
quantization procedure allows us to confront this question directly.
The pion-nucleon coupling constants $\gcup$ (CP conserving) and $\bgcup$ (CP
violating) are calculated in the large-$\Nc$, three-flavour Skyrme model by
direct evaluation of the leading matrix elements appearing in the LSZ reduction
formula. We find that $\gcup \sim \Nc^{{3 \over 2}}$, but that, at most,
$\bgcup \sim m^2_\pi \Nc^{-\shalf}$. These results show that the leading
contribution to the neutron electric dipole moment in large-$\Nc$ Skyrme model
is the direct one ($\Dn \sim \Nc m^2_\pi$), rather than the pion loop
contribution.
| [
{
"created": "Wed, 16 Dec 1992 19:33:00 GMT",
"version": "v1"
}
] | 2010-11-01 | [
[
"Riggs",
"H. A.",
""
],
[
"Schnitzer",
"H. J.",
""
]
] | We argue that the large-$\Nc$ behaviour of the Yukawa couplings in the Skyrme model involves issues more subtle than the vanishing of linear fluctuations needed for classical stability of the skyrmion. The chiral fluctuations about the skyrmion must be quantized in order to reach a conclusion. An improved quantization procedure allows us to confront this question directly. The pion-nucleon coupling constants $\gcup$ (CP conserving) and $\bgcup$ (CP violating) are calculated in the large-$\Nc$, three-flavour Skyrme model by direct evaluation of the leading matrix elements appearing in the LSZ reduction formula. We find that $\gcup \sim \Nc^{{3 \over 2}}$, but that, at most, $\bgcup \sim m^2_\pi \Nc^{-\shalf}$. These results show that the leading contribution to the neutron electric dipole moment in large-$\Nc$ Skyrme model is the direct one ($\Dn \sim \Nc m^2_\pi$), rather than the pion loop contribution. |
2111.12943 | Abinash Medhi | Abinash Medhi, Debajyoti Dutta, and Moon Moon Devi | Exploring the effects of Scalar Non Standard Interactions on the CP
violation sensitivity at DUNE | Revised version, accepted for publication in JHEP | null | 10.1007/JHEP06(2022)129 | null | hep-ph hep-ex | http://creativecommons.org/licenses/by/4.0/ | The Neutrino oscillations have provided an excellent opportunity to study
new-physics beyond the Standard Model, popularly known as BSM. The unknown
couplings involving neutrinos, termed non-standard interactions (NSI), may
appear as `new-physics' in different neutrino experiments. The neutrino NSI
offers significant effects on neutrino oscillations and CP-sensitivity, which
may be probed in various neutrino experiments. The idea of neutrinos coupling
with a scalar has evolved recently and looks promising. The effects of scalar
NSI may appear as a perturbation to the neutrino mass matrix in the neutrino
Hamiltonian. It modifies the neutrino mass matrix and may provide a direct
possibility of probing neutrino mass models. As the scalar NSI affects the
neutrino mass matrix in the Hamiltonian, its effect is energy independent.
Moreover, the matter effects due to scalar NSI scales linearly with the matter
density.
In this work, we have performed a model-independent study of the effects of
scalar NSI at long baseline neutrino experiments, taking DUNE as a case study.
We have performed such a thorough study for DUNE for the first time. Various
neutrino parameters may get affected due to the inclusion of scalar NSI as it
modifies the effective mass matrix of neutrinos. We have explored the impact of
scalar NSI in neutrino oscillations and its impact on the measurements of
various mixing parameters. We have probed the effects of scalar NSI on
different oscillation channels relevant to the experiment. We have also
explored the impact of various possible elements in the scalar NSI term on the
CP-violation sensitivity at DUNE.
| [
{
"created": "Thu, 25 Nov 2021 06:49:41 GMT",
"version": "v1"
},
{
"created": "Fri, 20 May 2022 10:42:01 GMT",
"version": "v2"
}
] | 2022-07-13 | [
[
"Medhi",
"Abinash",
""
],
[
"Dutta",
"Debajyoti",
""
],
[
"Devi",
"Moon Moon",
""
]
] | The Neutrino oscillations have provided an excellent opportunity to study new-physics beyond the Standard Model, popularly known as BSM. The unknown couplings involving neutrinos, termed non-standard interactions (NSI), may appear as `new-physics' in different neutrino experiments. The neutrino NSI offers significant effects on neutrino oscillations and CP-sensitivity, which may be probed in various neutrino experiments. The idea of neutrinos coupling with a scalar has evolved recently and looks promising. The effects of scalar NSI may appear as a perturbation to the neutrino mass matrix in the neutrino Hamiltonian. It modifies the neutrino mass matrix and may provide a direct possibility of probing neutrino mass models. As the scalar NSI affects the neutrino mass matrix in the Hamiltonian, its effect is energy independent. Moreover, the matter effects due to scalar NSI scales linearly with the matter density. In this work, we have performed a model-independent study of the effects of scalar NSI at long baseline neutrino experiments, taking DUNE as a case study. We have performed such a thorough study for DUNE for the first time. Various neutrino parameters may get affected due to the inclusion of scalar NSI as it modifies the effective mass matrix of neutrinos. We have explored the impact of scalar NSI in neutrino oscillations and its impact on the measurements of various mixing parameters. We have probed the effects of scalar NSI on different oscillation channels relevant to the experiment. We have also explored the impact of various possible elements in the scalar NSI term on the CP-violation sensitivity at DUNE. |
0906.4500 | Gardner Marshall | Erin De Pree (St Mary's, MD), Gardner Marshall and Marc Sher (William
and Mary) | The Fourth Generation t-prime in Extensions of the Standard Model | 4 pages, 2 figures. Version to be published in Phys. Rev. D | Phys.Rev.D80:037301,2009 | 10.1103/PhysRevD.80.037301 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the effects of a fourth generation t' quark in various extensions of
the standard model. In the Randall-Sundrum model, the decay t'--> t Z has a
large branching ratio that could be detected at the Large Hadron Collider
(LHC). We also look at the two-Higgs doublet models I, II and III, and note
that, in the latter, the branching ratio of t' --> t H, where H is a Higgs
scalar or pseudoscalar, is huge and we discuss detection at the LHC. A few
comments about the minimal supersymmetric standard model are also included.
| [
{
"created": "Wed, 24 Jun 2009 15:23:45 GMT",
"version": "v1"
},
{
"created": "Fri, 26 Jun 2009 12:51:19 GMT",
"version": "v2"
},
{
"created": "Wed, 29 Jul 2009 18:07:25 GMT",
"version": "v3"
}
] | 2009-09-02 | [
[
"De Pree",
"Erin",
"",
"St Mary's, MD"
],
[
"Marshall",
"Gardner",
"",
"William\n and Mary"
],
[
"Sher",
"Marc",
"",
"William\n and Mary"
]
] | We study the effects of a fourth generation t' quark in various extensions of the standard model. In the Randall-Sundrum model, the decay t'--> t Z has a large branching ratio that could be detected at the Large Hadron Collider (LHC). We also look at the two-Higgs doublet models I, II and III, and note that, in the latter, the branching ratio of t' --> t H, where H is a Higgs scalar or pseudoscalar, is huge and we discuss detection at the LHC. A few comments about the minimal supersymmetric standard model are also included. |
hep-ph/0405110 | Keith Olive | John Ellis, Keith A. Olive, Yudi Santoso, Vassilis C. Spanos | Very Constrained Minimal Supersymmetric Standard Models | 26 pages, 32 eps figures | Phys.Rev.D70:055005,2004 | 10.1103/PhysRevD.70.055005 | CERN-TH/2004-069, UMN-TH-2307/04, FTPI-MINN-04/18 | hep-ph | null | We consider very constrained versions of the minimal supersymmetric extension
of the Standard Model (VCMSSMs) which, in addition to constraining the scalar
masses m_0 and gaugino masses m_{1/2} to be universal at some input scale,
impose relations between the trilinear and bilinear soft supersymmetry breaking
parameters A_0 and B_0. These relations may be linear, as in simple minimal
supergravity models, or nonlinear, as in the Giudice-Masiero mechanism for
generating the Higgs-mixing mu term. We discuss the application of the
electroweak vacuum conditions in VCMSSMs, which may be used to make a
prediction for tan beta as a function of m_0 and m_{1/2} that is usually
unique. We baseline the discussion of the parameter spaces allowed in VCMSSMs
by updating the parameter space allowed in the CMSSM for fixed values of tan
beta with no relation between A_0 and B_0 assumed {\it a priori}, displaying
contours of B_0 for a fixed input value of A_0, incorporating the latest CDF/D0
measurement of m_t and the latest BNL measurement of g_mu - 2. We emphasize
that phenomenological studies of the CMSSM are frequently not applicable to
specific VCMSSMs, notably those based on minimal supergravity, which require
m_0 = m_{3/2} as well as A_0 = B_0 + m_0. We then display (m_{1/2}, m_0) planes
for selected VCMSSMs, treating in a unified way the parameter regions where
either a neutralino or the gravitino is the LSP. In particular, we examine in
detail the allowed parameter space for the Giudice-Masiero model.
| [
{
"created": "Wed, 12 May 2004 22:03:27 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Ellis",
"John",
""
],
[
"Olive",
"Keith A.",
""
],
[
"Santoso",
"Yudi",
""
],
[
"Spanos",
"Vassilis C.",
""
]
] | We consider very constrained versions of the minimal supersymmetric extension of the Standard Model (VCMSSMs) which, in addition to constraining the scalar masses m_0 and gaugino masses m_{1/2} to be universal at some input scale, impose relations between the trilinear and bilinear soft supersymmetry breaking parameters A_0 and B_0. These relations may be linear, as in simple minimal supergravity models, or nonlinear, as in the Giudice-Masiero mechanism for generating the Higgs-mixing mu term. We discuss the application of the electroweak vacuum conditions in VCMSSMs, which may be used to make a prediction for tan beta as a function of m_0 and m_{1/2} that is usually unique. We baseline the discussion of the parameter spaces allowed in VCMSSMs by updating the parameter space allowed in the CMSSM for fixed values of tan beta with no relation between A_0 and B_0 assumed {\it a priori}, displaying contours of B_0 for a fixed input value of A_0, incorporating the latest CDF/D0 measurement of m_t and the latest BNL measurement of g_mu - 2. We emphasize that phenomenological studies of the CMSSM are frequently not applicable to specific VCMSSMs, notably those based on minimal supergravity, which require m_0 = m_{3/2} as well as A_0 = B_0 + m_0. We then display (m_{1/2}, m_0) planes for selected VCMSSMs, treating in a unified way the parameter regions where either a neutralino or the gravitino is the LSP. In particular, we examine in detail the allowed parameter space for the Giudice-Masiero model. |
0901.3587 | Davison E. Soper | Zoltan Nagy and Davison E. Soper | Final state dipole showers and the DGLAP equation | 28 pages with 6 figures. This is the revised version, close to what
will be published in JHEP. The main changes were additional observations in
the conclusions section | JHEP 0905:088,2009 | 10.1088/1126-6708/2009/05/088 | DESY 08-208 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study a parton shower description, based on a dipole picture, of the final
state in electron-positron annihilation. In such a shower, the distribution
function describing the inclusive probability to find a quark with a given
energy depends on the shower evolution time. Starting from the exclusive
evolution equation for the shower, we derive an equation for the evolution of
the inclusive quark energy distribution in the limit of strong ordering in
shower evolution time of the successive parton splittings. We find that, as
expected, this is the DGLAP equation. This paper is a response to a recent
paper of Dokshitzer and Marchesini that raised troubling issues about whether a
dipole based shower could give the DGLAP equation for the quark energy
distribution.
| [
{
"created": "Fri, 23 Jan 2009 01:30:14 GMT",
"version": "v1"
},
{
"created": "Tue, 19 May 2009 18:17:55 GMT",
"version": "v2"
}
] | 2009-05-29 | [
[
"Nagy",
"Zoltan",
""
],
[
"Soper",
"Davison E.",
""
]
] | We study a parton shower description, based on a dipole picture, of the final state in electron-positron annihilation. In such a shower, the distribution function describing the inclusive probability to find a quark with a given energy depends on the shower evolution time. Starting from the exclusive evolution equation for the shower, we derive an equation for the evolution of the inclusive quark energy distribution in the limit of strong ordering in shower evolution time of the successive parton splittings. We find that, as expected, this is the DGLAP equation. This paper is a response to a recent paper of Dokshitzer and Marchesini that raised troubling issues about whether a dipole based shower could give the DGLAP equation for the quark energy distribution. |
2002.07821 | Doojin Kim | Doojin Kim, Jong-Chul Park, Kin Chung Fong, Gil-Ho Lee | Detection of Super-light Dark Matter Using Graphene Sensor | 8 pages, 4 figures, Funding agency information for the actual
experiment added, Appendix expanded, More figures added | null | null | MI-TH-205 | hep-ph cond-mat.mes-hall hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We propose a new dark-matter detection strategy that will enable the search
of super-light dark matter $m_\chi \simeq 0.1$ keV, representing an improvement
of the minimum detectable mass by more than three order of magnitude over the
ongoing experiments. This is possible by integrating intimately the target
material, $\pi$-bond electrons in graphene, into a Josephson junction to
achieve a high sensitivity detector that can resolve a small energy exchange
from dark matter as low as $\sim 0.1$ meV. We investigate detection prospects
with pg-, ng-, and $\mu$g-scale detectors by calculating the scattering rate
between dark matter and free electrons confined in two-dimensional graphene
with Pauli-blocking factors included. We find not only that the proposed
detector can serve as a complementary probe of super-light dark matter but also
achieve higher experimental sensitivities than other proposed experiments,
thanks to the extremely low energy threshold of our Josephson junction sensor.
| [
{
"created": "Tue, 18 Feb 2020 19:00:04 GMT",
"version": "v1"
},
{
"created": "Mon, 21 Sep 2020 14:38:25 GMT",
"version": "v2"
},
{
"created": "Mon, 17 Apr 2023 14:41:33 GMT",
"version": "v3"
}
] | 2023-04-18 | [
[
"Kim",
"Doojin",
""
],
[
"Park",
"Jong-Chul",
""
],
[
"Fong",
"Kin Chung",
""
],
[
"Lee",
"Gil-Ho",
""
]
] | We propose a new dark-matter detection strategy that will enable the search of super-light dark matter $m_\chi \simeq 0.1$ keV, representing an improvement of the minimum detectable mass by more than three order of magnitude over the ongoing experiments. This is possible by integrating intimately the target material, $\pi$-bond electrons in graphene, into a Josephson junction to achieve a high sensitivity detector that can resolve a small energy exchange from dark matter as low as $\sim 0.1$ meV. We investigate detection prospects with pg-, ng-, and $\mu$g-scale detectors by calculating the scattering rate between dark matter and free electrons confined in two-dimensional graphene with Pauli-blocking factors included. We find not only that the proposed detector can serve as a complementary probe of super-light dark matter but also achieve higher experimental sensitivities than other proposed experiments, thanks to the extremely low energy threshold of our Josephson junction sensor. |
1406.5476 | Guang-Peng Zhang | Guang-Peng Zhang | Probing transverse momentum dependent gluon distribution functions from
hadronic quarkonium pair production | 7 pages, 3 figures, 1 table | Phys. Rev. D 90, 094011 (2014) | 10.1103/PhysRevD.90.094011 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The inclusive hadronic production of $\eta_Q$($\eta_c$ or $\eta_b$) pair is
proposed to extract the transverse momentum dependent(TMD) gluon distribution
functions. We use nonrelativistic QCD(NRQCD) for the production of $\eta_Q$.
Under nonrelativistic limit TMD factorization for this process is assumed to
make a lowest order calculation. For unpolarized initial hadrons, unpolarized
and linearly polarized gluon distributions can be extracted by studying
different angular distributions.
| [
{
"created": "Fri, 20 Jun 2014 18:27:22 GMT",
"version": "v1"
}
] | 2014-12-03 | [
[
"Zhang",
"Guang-Peng",
""
]
] | The inclusive hadronic production of $\eta_Q$($\eta_c$ or $\eta_b$) pair is proposed to extract the transverse momentum dependent(TMD) gluon distribution functions. We use nonrelativistic QCD(NRQCD) for the production of $\eta_Q$. Under nonrelativistic limit TMD factorization for this process is assumed to make a lowest order calculation. For unpolarized initial hadrons, unpolarized and linearly polarized gluon distributions can be extracted by studying different angular distributions. |
1007.4715 | Shinya Matsuzaki | Masayasu Harada, Shinya Matsuzaki and Koichi Yamawaki | Holographic QCD Integrated back to Hidden Local Symmetry | 4 eps figures, 37 pages, latex, typos fixed; some discussions and
references added; fig.4 replaced | Phys.Rev.D82:076010,2010 | 10.1103/PhysRevD.82.076010 | null | hep-ph hep-th nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We develop a previously proposed gauge-invariant method to integrate out
infinite tower of Kaluza-Klein (KK) modes of vector and axialvector mesons in a
class of models of holographic QCD (HQCD). The HQCD is reduced by our method to
the chiral perturbation theory with the hidden local symmetry (HLS) having only
the lowest KK mode identified as the HLS gauge boson. We take the
Sakai-Sugimoto model as a concrete HQCD, and completely determine the ${\cal O}
(p^4)$ terms as well as the ${\cal O}(p^2)$ terms from the DBI part and the
anomaly-related (intrinsic parity odd) gauge-invariant terms from the CS part.
Effects of higher KK modes are fully included in these terms. To demonstrate
power of our method, we compute momentum-dependences of several form factors
such as the pion electromagnetic form factors, the $\pi^0$-$\gamma$ and
$\omega$-$\pi^0$ transition form factors compared with experiment, which was
not achieved before due to complication to handle infinite sums. We also study
other anomaly-related quantities like $\gamma^*$-$\pi^0$-$\pi^+$-$\pi^-$ and
$\omega$-$\pi^0$-$\pi^+$-$\pi^-$ vertex functions.
| [
{
"created": "Tue, 27 Jul 2010 13:27:14 GMT",
"version": "v1"
},
{
"created": "Wed, 28 Jul 2010 04:49:15 GMT",
"version": "v2"
},
{
"created": "Fri, 17 Sep 2010 16:05:49 GMT",
"version": "v3"
}
] | 2010-11-11 | [
[
"Harada",
"Masayasu",
""
],
[
"Matsuzaki",
"Shinya",
""
],
[
"Yamawaki",
"Koichi",
""
]
] | We develop a previously proposed gauge-invariant method to integrate out infinite tower of Kaluza-Klein (KK) modes of vector and axialvector mesons in a class of models of holographic QCD (HQCD). The HQCD is reduced by our method to the chiral perturbation theory with the hidden local symmetry (HLS) having only the lowest KK mode identified as the HLS gauge boson. We take the Sakai-Sugimoto model as a concrete HQCD, and completely determine the ${\cal O} (p^4)$ terms as well as the ${\cal O}(p^2)$ terms from the DBI part and the anomaly-related (intrinsic parity odd) gauge-invariant terms from the CS part. Effects of higher KK modes are fully included in these terms. To demonstrate power of our method, we compute momentum-dependences of several form factors such as the pion electromagnetic form factors, the $\pi^0$-$\gamma$ and $\omega$-$\pi^0$ transition form factors compared with experiment, which was not achieved before due to complication to handle infinite sums. We also study other anomaly-related quantities like $\gamma^*$-$\pi^0$-$\pi^+$-$\pi^-$ and $\omega$-$\pi^0$-$\pi^+$-$\pi^-$ vertex functions. |
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