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|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
2309.01767
|
Adrian Thompson
|
Adrian Thompson
|
On Coherence in Bragg-Primakoff Axion Photoconversion
|
PhD Thesis. 75 pages, 22 figures. arXiv admin note: substantial text
overlap with arXiv:2307.04861
| null | null | null |
hep-ph
|
http://creativecommons.org/publicdomain/zero/1.0/
|
Axions and axion-like pseudoscalar particles with dimension-5 couplings to
photons exhibit coherent Bragg-Primakoff scattering with ordered crystals at
keV energy scales. This provides for a natural detection technique in searches
for axions produce in the Sun's interior. I will motivate the utility of dark
matter direct detection experiments in searching for solar axions, emphasizing
the role crystal-based detector technologies. I present an updated theoretical
treatment of the Bragg-Primakoff photoconversion process for keV pseudoscalars,
and address simultaneously the effects of absorption of final state photons in
crystals on the loss of coherence, which can lead to large suppressive
corrections to the event rate sensitivity for this detection technique.
However, I also show that the Borrmann effect of anomalous absorption
significantly lifts the suppression. This phenomenon is studied in Ge, NaI, and
CsI crystal experiments and its impact on the the projected sensitivities of
SuperCDMS, LEGEND, and SABRE to the solar axion parameter space. Lastly, I
investigate the future reach of multi-ton scale crystal detectors and discuss
strategies to maximize the discovery potential of experimental efforts in this
vein.
|
[
{
"created": "Mon, 4 Sep 2023 19:07:44 GMT",
"version": "v1"
}
] |
2023-09-06
|
[
[
"Thompson",
"Adrian",
""
]
] |
Axions and axion-like pseudoscalar particles with dimension-5 couplings to photons exhibit coherent Bragg-Primakoff scattering with ordered crystals at keV energy scales. This provides for a natural detection technique in searches for axions produce in the Sun's interior. I will motivate the utility of dark matter direct detection experiments in searching for solar axions, emphasizing the role crystal-based detector technologies. I present an updated theoretical treatment of the Bragg-Primakoff photoconversion process for keV pseudoscalars, and address simultaneously the effects of absorption of final state photons in crystals on the loss of coherence, which can lead to large suppressive corrections to the event rate sensitivity for this detection technique. However, I also show that the Borrmann effect of anomalous absorption significantly lifts the suppression. This phenomenon is studied in Ge, NaI, and CsI crystal experiments and its impact on the the projected sensitivities of SuperCDMS, LEGEND, and SABRE to the solar axion parameter space. Lastly, I investigate the future reach of multi-ton scale crystal detectors and discuss strategies to maximize the discovery potential of experimental efforts in this vein.
|
1202.3794
|
Wouter Waalewijn
|
Aneesh V. Manohar and Wouter J. Waalewijn
|
A QCD Analysis of Double Parton Scattering: Color Correlations,
Interference Effects and Evolution
|
24 pages, 15 figures, v2: added WW cross section, additional spin
structures, finite terms of one-loop soft function, journal version
| null |
10.1103/PhysRevD.85.114009
| null |
hep-ph hep-ex nucl-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We derive a factorization formula for the double Drell-Yan cross section in
terms of double parton distribution functions (dPDFs). Diparton flavor, spin
and color correlations and parton-exchange interference terms contribute, even
for unpolarized beams. Soft radiation effects are nontrivial for the color
correlation and interference contributions, and are described by
non-perturbative soft functions. We provide a field-theoretic definition of the
quark dPDFs and study some of their basic properties, including discrete
symmetries and their interpretation in a non-relativistic quark model. We
calculate the renormalization group evolution of the quark dPDFs and of the
soft functions. The evolution receives contributions from both ultraviolet and
rapidity divergences. We find that color correlation and interference effects
are Sudakov suppressed, greatly reducing the number of dPDFs needed to describe
double parton scattering at high energy experiments.
|
[
{
"created": "Thu, 16 Feb 2012 21:09:49 GMT",
"version": "v1"
},
{
"created": "Thu, 19 Jul 2012 20:01:07 GMT",
"version": "v2"
}
] |
2013-05-30
|
[
[
"Manohar",
"Aneesh V.",
""
],
[
"Waalewijn",
"Wouter J.",
""
]
] |
We derive a factorization formula for the double Drell-Yan cross section in terms of double parton distribution functions (dPDFs). Diparton flavor, spin and color correlations and parton-exchange interference terms contribute, even for unpolarized beams. Soft radiation effects are nontrivial for the color correlation and interference contributions, and are described by non-perturbative soft functions. We provide a field-theoretic definition of the quark dPDFs and study some of their basic properties, including discrete symmetries and their interpretation in a non-relativistic quark model. We calculate the renormalization group evolution of the quark dPDFs and of the soft functions. The evolution receives contributions from both ultraviolet and rapidity divergences. We find that color correlation and interference effects are Sudakov suppressed, greatly reducing the number of dPDFs needed to describe double parton scattering at high energy experiments.
|
0711.0835
|
Igor Lokhtin P.
|
N.S. Amelin, R. Lednicky, I.P. Lokhtin, L.V. Malinina, A.M. Snigirev,
Iu.A.Karpenko, Yu.M. Sinyukov, I. Arsene, L. Bravina
|
Fast hadron freeze-out generator, part II: noncentral collisions
|
27 pages including 7 figures as EPS-files; prepared using LaTeX
package for publication in Physical Review C
|
Phys.Rev.C77:014903,2008
|
10.1103/PhysRevC.77.014903
| null |
hep-ph
| null |
The fast Monte Carlo procedure of hadron generation developed in our previous
work is extended to describe noncentral collisions of nuclei. We consider
different possibilities to introduce appropriate asymmetry of the freeze-out
hyper-surface and flow velocity profile. For comparison with other models and
experimental data we demonstrate the results based on the standard
parametrizations of the hadron freeze-out hyper-surface and flow velocity
profile assuming either a common chemical and thermal freeze-out or the
chemically frozen evolution from chemical to thermal freeze-out. The C++
generator code is written under the ROOT framework and is available for public
use at http://uhkm.jinr.ru/
|
[
{
"created": "Tue, 6 Nov 2007 10:51:06 GMT",
"version": "v1"
},
{
"created": "Thu, 13 Dec 2007 14:18:19 GMT",
"version": "v2"
}
] |
2008-11-26
|
[
[
"Amelin",
"N. S.",
""
],
[
"Lednicky",
"R.",
""
],
[
"Lokhtin",
"I. P.",
""
],
[
"Malinina",
"L. V.",
""
],
[
"Snigirev",
"A. M.",
""
],
[
"Karpenko",
"Iu. A.",
""
],
[
"Sinyukov",
"Yu. M.",
""
],
[
"Arsene",
"I.",
""
],
[
"Bravina",
"L.",
""
]
] |
The fast Monte Carlo procedure of hadron generation developed in our previous work is extended to describe noncentral collisions of nuclei. We consider different possibilities to introduce appropriate asymmetry of the freeze-out hyper-surface and flow velocity profile. For comparison with other models and experimental data we demonstrate the results based on the standard parametrizations of the hadron freeze-out hyper-surface and flow velocity profile assuming either a common chemical and thermal freeze-out or the chemically frozen evolution from chemical to thermal freeze-out. The C++ generator code is written under the ROOT framework and is available for public use at http://uhkm.jinr.ru/
|
1904.01243
|
Mariola Klusek-Gawenda
|
Mariola Klusek-Gawenda, Ronan McNulty, Rainer Schicker and Antoni
Szczurek
|
Light-by-light scattering in ultra-peripheral heavy-ion collisions at
low diphoton masses
|
15 pages, 8 figures
|
Phys. Rev. D 99, 093013 (2019)
|
10.1103/PhysRevD.99.093013
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We present a study of photon-photon scattering in the mass range
$W_{\gamma\gamma} < 5$ GeV. We extend earlier calculations of this cross
section for $W_{\gamma\gamma}>$ 5 GeV into the low mass range where
photoproduction of the pseudoscalar resonances $\eta$, $\eta^{'}(958)$
contributes to two-photon final states. We present the elementary photon-photon
cross section as a function of diphoton mass $M_{\gamma\gamma}$ arising from
lepton and quark loop diagrams, and the visible cross section obtained with the
gamma-gamma decay branching fractions of the resonances $\eta$,
$\eta^{'}(958)$, $\eta_c(1S)$, $\eta_c(2S)$, $\chi_{c0}(1P)$. We derive the
corresponding cross sections in ultra-peripheral Pb-Pb collisions at
$\sqrt{s_{NN}}$ = 5.02 TeV by folding the elementary cross section with the
heavy-ion photon fluxes. We consider the dominating background of the
two-photon final state which arises from gamma decays of photoproduced
$\pi^{0}$-pairs. Such $\pi^{0}$-pairs contribute to the background when only
two of the four decay photons are within the experimental acceptance, while the
other two photons escape undetected. We reduce this background by applying cuts
on asymmetries of transverse momenta of the two photons and indicate how the
background can be further suppressed using a multivariate sideband analysis. We
present the cross section for the signal and the background at midrapidity
$|\eta| <$ 0.9, and in the forward rapidity range 2.0 $< \eta <$ 4.5.
|
[
{
"created": "Tue, 2 Apr 2019 06:58:09 GMT",
"version": "v1"
}
] |
2019-06-05
|
[
[
"Klusek-Gawenda",
"Mariola",
""
],
[
"McNulty",
"Ronan",
""
],
[
"Schicker",
"Rainer",
""
],
[
"Szczurek",
"Antoni",
""
]
] |
We present a study of photon-photon scattering in the mass range $W_{\gamma\gamma} < 5$ GeV. We extend earlier calculations of this cross section for $W_{\gamma\gamma}>$ 5 GeV into the low mass range where photoproduction of the pseudoscalar resonances $\eta$, $\eta^{'}(958)$ contributes to two-photon final states. We present the elementary photon-photon cross section as a function of diphoton mass $M_{\gamma\gamma}$ arising from lepton and quark loop diagrams, and the visible cross section obtained with the gamma-gamma decay branching fractions of the resonances $\eta$, $\eta^{'}(958)$, $\eta_c(1S)$, $\eta_c(2S)$, $\chi_{c0}(1P)$. We derive the corresponding cross sections in ultra-peripheral Pb-Pb collisions at $\sqrt{s_{NN}}$ = 5.02 TeV by folding the elementary cross section with the heavy-ion photon fluxes. We consider the dominating background of the two-photon final state which arises from gamma decays of photoproduced $\pi^{0}$-pairs. Such $\pi^{0}$-pairs contribute to the background when only two of the four decay photons are within the experimental acceptance, while the other two photons escape undetected. We reduce this background by applying cuts on asymmetries of transverse momenta of the two photons and indicate how the background can be further suppressed using a multivariate sideband analysis. We present the cross section for the signal and the background at midrapidity $|\eta| <$ 0.9, and in the forward rapidity range 2.0 $< \eta <$ 4.5.
|
1802.00763
|
Benoit Loiseau
|
J.-P. Dedonder, B. Loiseau, S. Wycech
|
Photon or meson formation in $J/\psi$ decays into $p {\overline{p}}$
|
37 pages, 5 tables and 10 figures. Extended discussions, one more
figure and several references added
|
Phys. Rev. C 97, 065206 (2018)
|
10.1103/PhysRevC.97.065206
| null |
hep-ph hep-ex nucl-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
The measurements of the $J/\psi \rightarrow \gamma p \overline{p}$ decays by
the BES Collaboration indicate an enhancement at the $p \overline{p}$ threshold
which, however, is not present in the J/$\psi$ decays into $\omega p
\overline{p}$ and into $\pi p \overline{p}$. Here, two processes for describing
the decays $J/\psi \rightarrow \mathcal{B} p \overline{p}$ where $\mathcal{B} =
\gamma, \omega$ are presented in some detail and the cases $\mathcal{B} =\phi,
\pi $ are briefly touched on. The first one, applied not only to the radiative
decay to reproduce the threshold peak but also to the $\omega p \overline{p}$
decay channel to improve the description of the spectrum, postulates a direct
emission of the boson before the baryon pair is formed. The second process
assumes that the boson $\mathcal{B}$ is emitted from the baryon pair following
the $J/\psi$ decay and includes for the decays into $\gamma p \overline{p}$ a
final state nucleon-antinucleon interaction based on the Paris $N \overline{N}$
potential. The reproduction of the $p \overline{p}$ distribution in the $J/\psi
\rightarrow \omega p \overline{p}$ decays needs a final state interaction
involving a $N(2050)\ 3/2^-$ resonance. The photon- and meson-emission rates
are reproduced in a semi-quantitative way.
|
[
{
"created": "Fri, 2 Feb 2018 16:45:18 GMT",
"version": "v1"
},
{
"created": "Fri, 22 Jun 2018 14:27:48 GMT",
"version": "v2"
}
] |
2018-06-27
|
[
[
"Dedonder",
"J. -P.",
""
],
[
"Loiseau",
"B.",
""
],
[
"Wycech",
"S.",
""
]
] |
The measurements of the $J/\psi \rightarrow \gamma p \overline{p}$ decays by the BES Collaboration indicate an enhancement at the $p \overline{p}$ threshold which, however, is not present in the J/$\psi$ decays into $\omega p \overline{p}$ and into $\pi p \overline{p}$. Here, two processes for describing the decays $J/\psi \rightarrow \mathcal{B} p \overline{p}$ where $\mathcal{B} = \gamma, \omega$ are presented in some detail and the cases $\mathcal{B} =\phi, \pi $ are briefly touched on. The first one, applied not only to the radiative decay to reproduce the threshold peak but also to the $\omega p \overline{p}$ decay channel to improve the description of the spectrum, postulates a direct emission of the boson before the baryon pair is formed. The second process assumes that the boson $\mathcal{B}$ is emitted from the baryon pair following the $J/\psi$ decay and includes for the decays into $\gamma p \overline{p}$ a final state nucleon-antinucleon interaction based on the Paris $N \overline{N}$ potential. The reproduction of the $p \overline{p}$ distribution in the $J/\psi \rightarrow \omega p \overline{p}$ decays needs a final state interaction involving a $N(2050)\ 3/2^-$ resonance. The photon- and meson-emission rates are reproduced in a semi-quantitative way.
|
0912.3576
|
M. Abu-shady
|
M. Abu-Shady
|
Nucleon Properties from Approximating Chiral Quark Sigma Model
|
14 pages, 2 figures. Int. J. Appl. Math. Inf. Sci. (accepted)
|
Int. J. Appl. Math. Inf. Sci, Vol. 5, No. 3 (2011) PP. 304S-314S
| null | null |
hep-ph nucl-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We apply the approximating chiral quark model. This chiral quark model is
based on an effective Lagrangian which the interactions between quarks via
sigma and pions mesons. The field equations have been solved in the mean field
approximation for the hedgehog baryon state. Good results are obtained for
nucleon properties in comparison with original model.
|
[
{
"created": "Fri, 18 Dec 2009 14:08:44 GMT",
"version": "v1"
}
] |
2012-12-13
|
[
[
"Abu-Shady",
"M.",
""
]
] |
We apply the approximating chiral quark model. This chiral quark model is based on an effective Lagrangian which the interactions between quarks via sigma and pions mesons. The field equations have been solved in the mean field approximation for the hedgehog baryon state. Good results are obtained for nucleon properties in comparison with original model.
|
1408.4957
|
Wolfgang Lucha
|
Wolfgang Lucha, Franz F. Sch\"oberl
|
The Spinless Relativistic Hulth\'en Problem
|
8 pages
|
Int. J. Mod. Phys. A 29 (2014) 1450181
|
10.1142/S0217751X14501814
|
HEPHY-PUB 938/14
|
hep-ph math-ph math.MP nucl-th quant-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
The spinless Salpeter equation can be regarded as the eigenvalue equation of
a Hamiltonian that involves the relativistic kinetic energy and therefore is,
in general, a nonlocal operator. Accordingly, it is hard to find solutions of
this bound-state equation by exclusively analytic means. Nevertheless, a lot of
tools enables us to constrain the resulting bound-state spectra rigorously. We
illustrate some of these techniques for the example of the Hulth\'en potential.
|
[
{
"created": "Thu, 21 Aug 2014 11:05:47 GMT",
"version": "v1"
}
] |
2014-11-20
|
[
[
"Lucha",
"Wolfgang",
""
],
[
"Schöberl",
"Franz F.",
""
]
] |
The spinless Salpeter equation can be regarded as the eigenvalue equation of a Hamiltonian that involves the relativistic kinetic energy and therefore is, in general, a nonlocal operator. Accordingly, it is hard to find solutions of this bound-state equation by exclusively analytic means. Nevertheless, a lot of tools enables us to constrain the resulting bound-state spectra rigorously. We illustrate some of these techniques for the example of the Hulth\'en potential.
|
2401.02146
|
Ankush Sharma
|
Ankush Sharma, Alka Upadhyay
|
Masses and Magnetic Moments of Singly Heavy Pentaquarks
| null | null | null | null |
hep-ph
|
http://creativecommons.org/licenses/by/4.0/
|
Motivated by the recent discovery of single heavy tetraquark structures,
$T_{c\bar{s}0}^a (2900)^{++}$ and $T_{c\bar{s}0}^a(2900)^0$ by the LHCb
collaboration, masses and magnetic moments of singly heavy pentaquark states
are estimated in this work. To classify the singly heavy pentaquark structures,
we employ the special unitary representation. By using the SU(3) flavor
representation, we placed singly heavy pentaquark states into the allowed
flavor multiples. Also, by using the extension of the Gursey-Radicati mass
formula and the effective mass scheme, we estimated the masses of singly heavy
pentaquark states. Further, magnetic moments of these states have been
calculated using the effective mass and the screened charge techniques. A
thorough comparison of our results shows reasonable agreement with the
available theoretical data and may be helpful for future experimental studies.
|
[
{
"created": "Thu, 4 Jan 2024 08:51:19 GMT",
"version": "v1"
},
{
"created": "Sun, 28 Jul 2024 06:24:02 GMT",
"version": "v2"
}
] |
2024-07-30
|
[
[
"Sharma",
"Ankush",
""
],
[
"Upadhyay",
"Alka",
""
]
] |
Motivated by the recent discovery of single heavy tetraquark structures, $T_{c\bar{s}0}^a (2900)^{++}$ and $T_{c\bar{s}0}^a(2900)^0$ by the LHCb collaboration, masses and magnetic moments of singly heavy pentaquark states are estimated in this work. To classify the singly heavy pentaquark structures, we employ the special unitary representation. By using the SU(3) flavor representation, we placed singly heavy pentaquark states into the allowed flavor multiples. Also, by using the extension of the Gursey-Radicati mass formula and the effective mass scheme, we estimated the masses of singly heavy pentaquark states. Further, magnetic moments of these states have been calculated using the effective mass and the screened charge techniques. A thorough comparison of our results shows reasonable agreement with the available theoretical data and may be helpful for future experimental studies.
|
hep-ph/9609528
|
Ralf Hempfling
|
Ralf Hempfling
|
Neutrino properties and SUSY without $R$-parity
|
4 pages, 3 PS-fig, LATEX, uses world-sci.sty
| null | null |
MPI-PhT/96-104 and UCDPHY-96-27 to appear in the Proceedings of the
VIIIth Rencontres de Blois: "Neutrinos, Dark Matter and the Universe", Blois,
France (June 8-12, 1996)
|
hep-ph
| null |
In supersymmetric models without $R$-parity neutrinos naturally become
massive and mix with each other. We explore the predictions of a very
restricted model with only three free parameters and find that this model
naturally yields masses and mixing angles compatible with experimental results
from solar and atmospheric neutrino experiments. Furthermore, there is a tiny
region in parameter space where the solution to the solar neutrino puzzle is
compatible with either the LSND result or the existence of significant hot dark
matter neutrinos.
|
[
{
"created": "Mon, 30 Sep 1996 21:31:20 GMT",
"version": "v1"
}
] |
2007-05-23
|
[
[
"Hempfling",
"Ralf",
""
]
] |
In supersymmetric models without $R$-parity neutrinos naturally become massive and mix with each other. We explore the predictions of a very restricted model with only three free parameters and find that this model naturally yields masses and mixing angles compatible with experimental results from solar and atmospheric neutrino experiments. Furthermore, there is a tiny region in parameter space where the solution to the solar neutrino puzzle is compatible with either the LSND result or the existence of significant hot dark matter neutrinos.
|
hep-ph/9505404
|
Andreas Vogt
|
W. Vogelsang (Rutherford Appleton Lab), A. Vogt (DESY)
|
Constraints on the Proton's Gluon Distribution from Prompt Photon
Production
|
29 Pages, LaTeX, 9 figures
|
Nucl.Phys. B453 (1995) 334-354
|
10.1016/0550-3213(95)00424-Q
|
CCL-TR-95-004, DESY 95-096
|
hep-ph
| null |
We analyze the capability of prompt photon production in pp and pp(bar)
collisions to constrain the gluon distribution of the proton, considering data
from fixed-target experiments as well as collider measurements. Combined fits
are performed to these large-p_T direct gamma cross sections and lepton-proton
deep-inelastic scattering data in the framework of next-to-leading order
perturbative QCD. Special attention is paid to theoretical uncertainties
originating from the scale dependence of the results and from the fragmentation
contribution to the prompt photon cross section.
|
[
{
"created": "Mon, 29 May 1995 15:22:39 GMT",
"version": "v1"
}
] |
2009-10-28
|
[
[
"Vogelsang",
"W.",
"",
"Rutherford Appleton Lab"
],
[
"Vogt",
"A.",
"",
"DESY"
]
] |
We analyze the capability of prompt photon production in pp and pp(bar) collisions to constrain the gluon distribution of the proton, considering data from fixed-target experiments as well as collider measurements. Combined fits are performed to these large-p_T direct gamma cross sections and lepton-proton deep-inelastic scattering data in the framework of next-to-leading order perturbative QCD. Special attention is paid to theoretical uncertainties originating from the scale dependence of the results and from the fragmentation contribution to the prompt photon cross section.
|
1604.08072
|
Monika Richter
|
Bartosz Dziewit, Jacek Holeczek, Monika Richter, Sebastian Zaj\k{a}c,
Marek Zra{\l}ek
|
The discrete family symmetry as a possible solution to the flavour
problem
|
10 pages, the topic presented at the IX International Symposium :"
Quantum Theory and Symmetries" in Yerevan, Armenia (July 2015)
| null |
10.1134/S1063778817040081
| null |
hep-ph hep-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
In order to explain the fermions masses and mixing parameters appearing in
the lepton sector of the Standard Model, one proposes the extension of its
symmetry. A discrete, non-abelian subgroup of $U(3)$ is added to the gauge
group $SU(3)_{C}\times SU(2)_{L}\times U(1)_{Y}$ . Apart from that, one assumes
the existence of one extra Higgs doublet. This article focuses mainly on the
mathematical theorems and computational techniques which brought us to the
results.
|
[
{
"created": "Wed, 27 Apr 2016 14:00:27 GMT",
"version": "v1"
},
{
"created": "Fri, 17 Jun 2016 23:26:43 GMT",
"version": "v2"
}
] |
2017-09-13
|
[
[
"Dziewit",
"Bartosz",
""
],
[
"Holeczek",
"Jacek",
""
],
[
"Richter",
"Monika",
""
],
[
"Zając",
"Sebastian",
""
],
[
"Zrałek",
"Marek",
""
]
] |
In order to explain the fermions masses and mixing parameters appearing in the lepton sector of the Standard Model, one proposes the extension of its symmetry. A discrete, non-abelian subgroup of $U(3)$ is added to the gauge group $SU(3)_{C}\times SU(2)_{L}\times U(1)_{Y}$ . Apart from that, one assumes the existence of one extra Higgs doublet. This article focuses mainly on the mathematical theorems and computational techniques which brought us to the results.
|
1001.0996
|
Alexander Friedland
|
Alexander Friedland
|
Self-refraction of supernova neutrinos: mixed spectra and three-flavor
instabilities
|
7 pages, 5 figures; updated to match the PRL version
|
Phys.Rev.Lett.104:191102,2010
|
10.1103/PhysRevLett.104.191102
|
LA-UR-09-07469
|
hep-ph astro-ph.SR
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Neutrinos in a core-collapse supernova undergo coherent flavor
transformations in their own background. We explore this phenomenon during the
cooling stage of the explosion. Our three-flavor calculations reveal
qualitatively new effects compared to a two-flavor analysis. These effects are
especially clearly seen for the inverted mass hierarchy: we find a different
pattern of spectral "swaps" in the neutrino spectrum and a novel "mixed"
spectrum for the antineutrinos. A brief discussion of the relevant physics is
presented, including the instability of the two-flavor evolution trajectory,
the 3-flavor pattern of spectral "swaps," and partial nonadiabaticity of the
evolution.
|
[
{
"created": "Thu, 7 Jan 2010 20:09:52 GMT",
"version": "v1"
},
{
"created": "Tue, 11 May 2010 23:02:34 GMT",
"version": "v2"
}
] |
2010-05-25
|
[
[
"Friedland",
"Alexander",
""
]
] |
Neutrinos in a core-collapse supernova undergo coherent flavor transformations in their own background. We explore this phenomenon during the cooling stage of the explosion. Our three-flavor calculations reveal qualitatively new effects compared to a two-flavor analysis. These effects are especially clearly seen for the inverted mass hierarchy: we find a different pattern of spectral "swaps" in the neutrino spectrum and a novel "mixed" spectrum for the antineutrinos. A brief discussion of the relevant physics is presented, including the instability of the two-flavor evolution trajectory, the 3-flavor pattern of spectral "swaps," and partial nonadiabaticity of the evolution.
|
1310.1090
|
Emidio Gabrielli
|
Emidio Gabrielli and Martti Raidal
|
Exponentially spread dynamical Yukawa couplings from non-perturbative
chiral symmetry breaking in the dark sector
|
Text improved, new equations and references added, version to appear
in Phys.Rev.D, 12 pages, 2 figures
|
Phys. Rev. D 89, 015008 (2014)
|
10.1103/PhysRevD.89.015008
| null |
hep-ph hep-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We propose a new paradigm for generating exponentially spread standard model
Yukawa couplings from a new $U(1)_F$ gauge symmetry in the dark sector. Chiral
symmetry is spontaneously broken among dark fermions that obtain non-vanishing
masses from a non-perturbative solution to the mass gap equation. The necessary
ingredient for this mechanism to work is the existence of higher derivative
terms in the dark $U(1)_F$ theory, or equivalently the existence of Lee-Wick
ghosts, that (i) allow for a non-perturbative solution to the mass gap equation
in the weak coupling regime of the Abelian theory; (ii) induce exponential
dependence of the generated masses on dark fermion $U(1)_F$ quantum numbers.
The generated flavor and chiral symmetry breaking in the dark sector is
transferred to the standard model Yukawa couplings at one loop level via Higgs
portal type scalar messenger fields. The latter carry quantum numbers of
squarks and sleptons. A new intriguing phenomenology is predicted that could be
potentially tested at the LHC, provided the characteristic mass scale of the
messenger sector is accessible at the LHC as is suggested by naturalness
arguments.
|
[
{
"created": "Thu, 3 Oct 2013 20:00:03 GMT",
"version": "v1"
},
{
"created": "Wed, 18 Dec 2013 19:23:34 GMT",
"version": "v2"
}
] |
2014-01-22
|
[
[
"Gabrielli",
"Emidio",
""
],
[
"Raidal",
"Martti",
""
]
] |
We propose a new paradigm for generating exponentially spread standard model Yukawa couplings from a new $U(1)_F$ gauge symmetry in the dark sector. Chiral symmetry is spontaneously broken among dark fermions that obtain non-vanishing masses from a non-perturbative solution to the mass gap equation. The necessary ingredient for this mechanism to work is the existence of higher derivative terms in the dark $U(1)_F$ theory, or equivalently the existence of Lee-Wick ghosts, that (i) allow for a non-perturbative solution to the mass gap equation in the weak coupling regime of the Abelian theory; (ii) induce exponential dependence of the generated masses on dark fermion $U(1)_F$ quantum numbers. The generated flavor and chiral symmetry breaking in the dark sector is transferred to the standard model Yukawa couplings at one loop level via Higgs portal type scalar messenger fields. The latter carry quantum numbers of squarks and sleptons. A new intriguing phenomenology is predicted that could be potentially tested at the LHC, provided the characteristic mass scale of the messenger sector is accessible at the LHC as is suggested by naturalness arguments.
|
hep-ph/9401218
|
Silas Beane
|
S.R. Beane and U. van Kolck
|
The Dilated Chiral Quark Model
|
8 pages, uses TeXsis or mTeXsis.tex,CPP-94-2,DOE/ER/40427-01-N94
|
Phys.Lett. B328 (1994) 137-142
|
10.1016/0370-2693(94)90441-3
| null |
hep-ph
| null |
It is argued that constituent quarks live in an effective theory that
possesses an approximate conformal invariance. An effective lagrangian is
constructed which in the large-$\nc$ approximation incorporates Regge
asymptotic constraints. The resulting picture explains why linear-sigma models
provide successful constituent quark descriptions, both at zero and finite
temperature. Our analysis suggests an interesting relation between non-linearly
realized conformal invariance and the completion of chiral multiplets in the
broken symmetry phase.
|
[
{
"created": "Fri, 7 Jan 1994 02:51:52 GMT",
"version": "v1"
},
{
"created": "Tue, 5 Apr 1994 21:12:30 GMT",
"version": "v2"
}
] |
2009-10-28
|
[
[
"Beane",
"S. R.",
""
],
[
"van Kolck",
"U.",
""
]
] |
It is argued that constituent quarks live in an effective theory that possesses an approximate conformal invariance. An effective lagrangian is constructed which in the large-$\nc$ approximation incorporates Regge asymptotic constraints. The resulting picture explains why linear-sigma models provide successful constituent quark descriptions, both at zero and finite temperature. Our analysis suggests an interesting relation between non-linearly realized conformal invariance and the completion of chiral multiplets in the broken symmetry phase.
|
1005.1025
|
George Leontaris
|
S.F. King, G.K. Leontaris, G.G. Ross
|
Family symmetries in F-theory GUTs
|
Typos corrected. 1 reference added. Version to appear in Nucl. Phys.
B
|
Nucl.Phys.B838:119-135,2010
|
10.1016/j.nuclphysb.2010.05.014
| null |
hep-ph hep-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We discuss F-theory SU(5) GUTs in which some or all of the quark and lepton
families are assigned to different curves and family symmetry enforces a
leading order rank one structure of the Yukawa matrices. We consider two
possibilities for the suppression of baryon and lepton number violation. The
first is based on Flipped SU(5) with gauge group SU(5)\times U(1)_\chi \times
SU(4)_{\perp} in which U(1)_{\chi} plays the role of a generalised matter
parity. We present an example which, after imposing a Z_2 monodromy, has a
U(1)_{\perp}^2 family symmetry. Even in the absence of flux, spontaneous
breaking of the family symmetry leads to viable quark, charged lepton and
neutrino masses and mixing. The second possibility has an R-parity associated
with the symmetry of the underlying compactification manifold and the flux. We
construct an example of a model with viable masses and mixing angles based on
the gauge group SU(5)\times SU(5)_{\perp} with a U(1)_{\perp}^3 family symmetry
after imposing a Z_2 monodromy.
|
[
{
"created": "Thu, 6 May 2010 15:56:34 GMT",
"version": "v1"
},
{
"created": "Sat, 22 May 2010 09:17:39 GMT",
"version": "v2"
}
] |
2014-11-21
|
[
[
"King",
"S. F.",
""
],
[
"Leontaris",
"G. K.",
""
],
[
"Ross",
"G. G.",
""
]
] |
We discuss F-theory SU(5) GUTs in which some or all of the quark and lepton families are assigned to different curves and family symmetry enforces a leading order rank one structure of the Yukawa matrices. We consider two possibilities for the suppression of baryon and lepton number violation. The first is based on Flipped SU(5) with gauge group SU(5)\times U(1)_\chi \times SU(4)_{\perp} in which U(1)_{\chi} plays the role of a generalised matter parity. We present an example which, after imposing a Z_2 monodromy, has a U(1)_{\perp}^2 family symmetry. Even in the absence of flux, spontaneous breaking of the family symmetry leads to viable quark, charged lepton and neutrino masses and mixing. The second possibility has an R-parity associated with the symmetry of the underlying compactification manifold and the flux. We construct an example of a model with viable masses and mixing angles based on the gauge group SU(5)\times SU(5)_{\perp} with a U(1)_{\perp}^3 family symmetry after imposing a Z_2 monodromy.
|
hep-ph/0403067
|
Stephen West
|
John March-Russell, Stephen West
|
A Simple Model of Neutrino Masses from Supersymmetry Breaking
|
10 pages, latex, 1 figure, references added, typos fixed
|
Phys.Lett. B593 (2004) 181-188
|
10.1016/j.physletb.2004.04.050
|
OUTP-04/08
|
hep-ph
| null |
We analyze a class of supersymmetric models first introduced by Arkani-Hamed
et al and Borzumati et al in which the light neutrino masses result from
higher-dimensional supersymmetry-breaking terms in the MSSM super- and
Kahler-potentials. The mechanism is closely related to the Giudice-Masiero
mechanism for the MSSM $\mu$ parameter, and leads to TeV-scale right-handed
neutrino and sneutrino states, that are in principle accessible to direct
experimental study. The dominant contribution to the light neutrino (Majorana)
mass matrix is a one-loop term induced by a lepton-number violating $B$-term
for the sneutrino states that is naturally present. We focus upon the
simplification and analysis of the flavour structure of this general class of
models, finding that simple and novel origins for the light neutrino mass
matrix are possible. We find that a subdominant tree-level `see-saw'
contribution may lead to interesting perturbations of the leading
one-loop-induced flavour structure, possibly generating the small ratio $\Delta
m_{\rm solar}^2/\Delta m_{\rm atm}^2$ dynamically.
|
[
{
"created": "Fri, 5 Mar 2004 16:33:14 GMT",
"version": "v1"
},
{
"created": "Wed, 17 Mar 2004 15:04:56 GMT",
"version": "v2"
}
] |
2009-11-10
|
[
[
"March-Russell",
"John",
""
],
[
"West",
"Stephen",
""
]
] |
We analyze a class of supersymmetric models first introduced by Arkani-Hamed et al and Borzumati et al in which the light neutrino masses result from higher-dimensional supersymmetry-breaking terms in the MSSM super- and Kahler-potentials. The mechanism is closely related to the Giudice-Masiero mechanism for the MSSM $\mu$ parameter, and leads to TeV-scale right-handed neutrino and sneutrino states, that are in principle accessible to direct experimental study. The dominant contribution to the light neutrino (Majorana) mass matrix is a one-loop term induced by a lepton-number violating $B$-term for the sneutrino states that is naturally present. We focus upon the simplification and analysis of the flavour structure of this general class of models, finding that simple and novel origins for the light neutrino mass matrix are possible. We find that a subdominant tree-level `see-saw' contribution may lead to interesting perturbations of the leading one-loop-induced flavour structure, possibly generating the small ratio $\Delta m_{\rm solar}^2/\Delta m_{\rm atm}^2$ dynamically.
|
1202.2700
|
Johannes Bluemlein
|
J. Ablinger, J. Bl\"umlein, A. Hasselhuhn, S. Klein, C. Schneider, F.
Wi{\ss}brock
|
New Heavy Flavor Contributions to the DIS Structure Function
$F_2(x,Q^2)$ at $O(\alpha_s^3)
|
8 pages, 1 figure, Contribution to the Proceedings of RADCOR 2011
| null | null |
DESY 10-065; DO-TH 12/05; SFB/CPP-12-09; LPN 12-036
|
hep-ph hep-ex math-ph math.AG math.MP
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We report on recent results obtained for the massive Wilson coefficients
which contribute to the structure function $F_2(x,Q^2)$ at $O(\alpha_s^3)$ in
the region $Q^2/m^2 \gsim 10$. In the calculation new species of harmonic sums
and harmonic polylogarithms generated by cyclotomic polynomials arise in
intermediary results which are briefly discussed.
|
[
{
"created": "Mon, 13 Feb 2012 12:05:42 GMT",
"version": "v1"
}
] |
2012-02-14
|
[
[
"Ablinger",
"J.",
""
],
[
"Blümlein",
"J.",
""
],
[
"Hasselhuhn",
"A.",
""
],
[
"Klein",
"S.",
""
],
[
"Schneider",
"C.",
""
],
[
"Wißbrock",
"F.",
""
]
] |
We report on recent results obtained for the massive Wilson coefficients which contribute to the structure function $F_2(x,Q^2)$ at $O(\alpha_s^3)$ in the region $Q^2/m^2 \gsim 10$. In the calculation new species of harmonic sums and harmonic polylogarithms generated by cyclotomic polynomials arise in intermediary results which are briefly discussed.
|
2107.02544
|
Pablo G. Ortega
|
Pablo G. Ortega, Jorge Segovia and Francisco Fernandez
|
The $Z_b$ structures in a constituent quark model coupled-channels
calculation
|
10 pages, 5 figures. arXiv admin note: text overlap with
arXiv:1808.00914
| null |
10.1103/PhysRevD.104.094004
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
The $Z_b(10610)^\pm$ and $Z_b(10650)^\pm$ are two bottomonium-like structures
discovered in the $\pi h_b(mP)$, $\pi \Upsilon(nS)$ and $B^\ast\bar
B^{(\ast)}+h.c.$ invariant mass spectra, where $m=\{1,2\}$ and $n=\{1,2,3\}$.
Their nature is puzzling due to their charge, which forces its minimal quark
content to be $b\bar b u\bar d$ ($b\bar b d\bar u$). Thus, it is necessary to
explore four-quark systems in order to understand their inner structure.
Additionally, their strong coupling to channels such as $\pi \Upsilon$ and the
closeness of their mass to $B^\ast\bar B^{(\ast)}$-thresholds stimulates a
molecular interpretation. Within the framework of a constituent quark model
which satisfactorily describes a wide range of properties of (non-)conventional
hadrons containing heavy quarks, we perform a coupled-channels calculation of
the $I^G(J^{PC})=1^+(1^{+-})$ hidden-bottom sector including $B^{(\ast)}\bar
B^{\ast}+h.c.$, $\pi h_b$, $\pi \Upsilon$ and $\rho\eta_b$ channels. We analyze
the line shapes in the different channels, describing the $\Upsilon(5S)\to \pi
B^{(*)}\bar B^{(*)}$ by means of the $^3P_0$ model. Since our description of
the line shapes promising, we perform the same coupled-channels calculation for
the $Z_b$'s with $J^{--}$, where $J=\{0,1,2\}$. This allows us to obtain a fair
description of the corresponding line shapes. The study of the analytic
structure of the $S$-matrix suggests that the experimental $Z_b$ structures
arise as a combination of several poles with $J^{PC}=0^{--}$, $1^{\pm-}$ and
$2^{--}$ quantum numbers nearby the $B\bar B^\ast$ and $B^\ast\bar B^\ast$
thresholds.
|
[
{
"created": "Tue, 6 Jul 2021 11:20:00 GMT",
"version": "v1"
}
] |
2021-11-17
|
[
[
"Ortega",
"Pablo G.",
""
],
[
"Segovia",
"Jorge",
""
],
[
"Fernandez",
"Francisco",
""
]
] |
The $Z_b(10610)^\pm$ and $Z_b(10650)^\pm$ are two bottomonium-like structures discovered in the $\pi h_b(mP)$, $\pi \Upsilon(nS)$ and $B^\ast\bar B^{(\ast)}+h.c.$ invariant mass spectra, where $m=\{1,2\}$ and $n=\{1,2,3\}$. Their nature is puzzling due to their charge, which forces its minimal quark content to be $b\bar b u\bar d$ ($b\bar b d\bar u$). Thus, it is necessary to explore four-quark systems in order to understand their inner structure. Additionally, their strong coupling to channels such as $\pi \Upsilon$ and the closeness of their mass to $B^\ast\bar B^{(\ast)}$-thresholds stimulates a molecular interpretation. Within the framework of a constituent quark model which satisfactorily describes a wide range of properties of (non-)conventional hadrons containing heavy quarks, we perform a coupled-channels calculation of the $I^G(J^{PC})=1^+(1^{+-})$ hidden-bottom sector including $B^{(\ast)}\bar B^{\ast}+h.c.$, $\pi h_b$, $\pi \Upsilon$ and $\rho\eta_b$ channels. We analyze the line shapes in the different channels, describing the $\Upsilon(5S)\to \pi B^{(*)}\bar B^{(*)}$ by means of the $^3P_0$ model. Since our description of the line shapes promising, we perform the same coupled-channels calculation for the $Z_b$'s with $J^{--}$, where $J=\{0,1,2\}$. This allows us to obtain a fair description of the corresponding line shapes. The study of the analytic structure of the $S$-matrix suggests that the experimental $Z_b$ structures arise as a combination of several poles with $J^{PC}=0^{--}$, $1^{\pm-}$ and $2^{--}$ quantum numbers nearby the $B\bar B^\ast$ and $B^\ast\bar B^\ast$ thresholds.
|
1811.02492
|
Miguel Fiolhais
|
Fr\'ed\'eric D\'eliot, Miguel C. N. Fiolhais, Ant\'onio Onofre
|
Top Quark Anomalous Couplings at the High-Luminosity Phase of the LHC
|
5 pages, 1 figure
|
Mod. Phys. Lett. A, Vol. 34, 1950142 (2019)
|
10.1142/S0217732319501426
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
The combination of the latest and most precise measurements of several top
quark properties is presented in this paper in order to establish allowed
regions on anomalous contributions to the Lorentz structure of the $Wtb$
vertex. These measurements include single top production cross sections, $W$
boson helicity fractions and forward-backward asymmetries, both at Tevatron and
at the Large Hadron Collider, up to a center-of-mass energy of 13 TeV. The
results obtained at 95% Confidence Level for the top quark anomalous couplings
are compared with the limits extracted from a combination that includes the
expected measurements at the future High-Luminosity run of the Large Hadron
Collider.
|
[
{
"created": "Tue, 6 Nov 2018 17:05:50 GMT",
"version": "v1"
}
] |
2019-03-25
|
[
[
"Déliot",
"Frédéric",
""
],
[
"Fiolhais",
"Miguel C. N.",
""
],
[
"Onofre",
"António",
""
]
] |
The combination of the latest and most precise measurements of several top quark properties is presented in this paper in order to establish allowed regions on anomalous contributions to the Lorentz structure of the $Wtb$ vertex. These measurements include single top production cross sections, $W$ boson helicity fractions and forward-backward asymmetries, both at Tevatron and at the Large Hadron Collider, up to a center-of-mass energy of 13 TeV. The results obtained at 95% Confidence Level for the top quark anomalous couplings are compared with the limits extracted from a combination that includes the expected measurements at the future High-Luminosity run of the Large Hadron Collider.
|
hep-ph/0601045
|
Hiroshi Tsujimoto
|
H. Tsujimoto
|
Relation between CKM and MNS Matrices Induced by Bi-Maximal Rotations in
the Seesaw Mechanism
|
19 pages, 7 figures, revtex4, to appear in J.PHYS.SOC.JAP
|
J.Phys.Soc.Jap. 75 (2006) 054101
|
10.1143/JPSJ.75.054101
|
KOBE-TH-06-01
|
hep-ph
| null |
It is found that the seesaw mechanism not only explains the smallness of
neutrino masses but also accounts for the large mixing angles simultaneously,
even if the unification of the neutrino Dirac mass matrix with that of up-type
quark sector is realized. In this mechanism, we show that the mixing matrix of
the Dirac-type mass matrix gets extra rotations from the diagonalization of
Majorana mass matrix. Assuming that the mixing angles to diagonalize the
Majorana mass matrix are extremely small, we find that the large mixing angles
of leptonic sector found in atmospheric and long baseline reactor neutrino
oscillation experiments can be explained by these extra rotations. We also find
that provided the mixing angle around y-axis to diagonalize the Majorana mass
matrix vanishes, we can derive the information about the absolute values of
neutrino masses and Majorana mass responsible for the neutrinoless double beta
decay experiment through the data set of neutrino experiments. In the
simplified case that there is no CP phase, we find that the neutrino masses are
decided as $m_1:m_2:m_3\approx 1:2:8$ and that there are no solution which
satisfy $m_3<m_1<m_2$ (inverted mass spectrum). Then, including all CP phases,
we reanalyze the absolute values of neutrino masses and Majorana mass
responsible for the neutrinoless double beta decay experiment.
|
[
{
"created": "Fri, 6 Jan 2006 10:50:01 GMT",
"version": "v1"
},
{
"created": "Thu, 16 Mar 2006 08:52:06 GMT",
"version": "v2"
}
] |
2009-11-11
|
[
[
"Tsujimoto",
"H.",
""
]
] |
It is found that the seesaw mechanism not only explains the smallness of neutrino masses but also accounts for the large mixing angles simultaneously, even if the unification of the neutrino Dirac mass matrix with that of up-type quark sector is realized. In this mechanism, we show that the mixing matrix of the Dirac-type mass matrix gets extra rotations from the diagonalization of Majorana mass matrix. Assuming that the mixing angles to diagonalize the Majorana mass matrix are extremely small, we find that the large mixing angles of leptonic sector found in atmospheric and long baseline reactor neutrino oscillation experiments can be explained by these extra rotations. We also find that provided the mixing angle around y-axis to diagonalize the Majorana mass matrix vanishes, we can derive the information about the absolute values of neutrino masses and Majorana mass responsible for the neutrinoless double beta decay experiment through the data set of neutrino experiments. In the simplified case that there is no CP phase, we find that the neutrino masses are decided as $m_1:m_2:m_3\approx 1:2:8$ and that there are no solution which satisfy $m_3<m_1<m_2$ (inverted mass spectrum). Then, including all CP phases, we reanalyze the absolute values of neutrino masses and Majorana mass responsible for the neutrinoless double beta decay experiment.
|
hep-ph/9507348
|
Ernest Ma
|
Ernest Ma (UC Riverside)
|
Neutrino Masses in an Extended Gauge Model with E_6 Particle Content
|
10 pages, latex, no figure
|
Phys.Lett. B380 (1996) 286-290
|
10.1016/0370-2693(96)00524-2
|
UCRHEP-T149 (July 1995)
|
hep-ph
| null |
Naturally light singlet neutrinos which mix with the usual doublet neutrinos
are possible if the supersymmetric standard gauge model is extended to include
a specific additional U(1) factor derivable from E_6 decomposition. The
low-energy particle content of the model is limited to the fundamental 27
representations of E_6.
|
[
{
"created": "Wed, 19 Jul 1995 18:15:04 GMT",
"version": "v1"
}
] |
2009-10-28
|
[
[
"Ma",
"Ernest",
"",
"UC Riverside"
]
] |
Naturally light singlet neutrinos which mix with the usual doublet neutrinos are possible if the supersymmetric standard gauge model is extended to include a specific additional U(1) factor derivable from E_6 decomposition. The low-energy particle content of the model is limited to the fundamental 27 representations of E_6.
|
0809.1442
|
Christian Schwinn
|
Christian Schwinn (RWTH Aachen University)
|
Twistor-inspired construction of massive quark amplitudes
|
34 pages, 5 figures, v2: published version, minor improvements to
text
|
Phys.Rev.D78:085030,2008
|
10.1103/PhysRevD.78.085030
|
PITHA 08/22
|
hep-ph hep-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
The analog of the Cachazo-Svrvcek-Witten rules for scattering amplitudes with
massive quarks is derived following an approach previously employed for
amplitudes with massive scalars. A prescription for the external wave-functions
is given that leads to a one-to one relation between fields in the action and
spin-states of massive quarks. Several examples for the application of the
rules are given and the structure of some all-multiplicity amplitudes with a
pair of massive quarks is discussed. The rules make supersymmetric relations to
amplitudes with massive scalars manifest at the level of the action. The
formalism is extended to several quark flavors with different masses.
|
[
{
"created": "Tue, 9 Sep 2008 09:19:50 GMT",
"version": "v1"
},
{
"created": "Thu, 30 Oct 2008 19:08:26 GMT",
"version": "v2"
}
] |
2008-11-26
|
[
[
"Schwinn",
"Christian",
"",
"RWTH Aachen University"
]
] |
The analog of the Cachazo-Svrvcek-Witten rules for scattering amplitudes with massive quarks is derived following an approach previously employed for amplitudes with massive scalars. A prescription for the external wave-functions is given that leads to a one-to one relation between fields in the action and spin-states of massive quarks. Several examples for the application of the rules are given and the structure of some all-multiplicity amplitudes with a pair of massive quarks is discussed. The rules make supersymmetric relations to amplitudes with massive scalars manifest at the level of the action. The formalism is extended to several quark flavors with different masses.
|
2004.12915
|
Andre Hoang
|
Andr\'e H. Hoang
|
What is the Top Quark Mass?
|
23 pages, 10 figures; Invited review prepared for Annual Review of
Nuclear and Particle Science 70 (2020)
| null |
10.1146/annurev-nucl-101918-023530
|
UWThPh-2020-1
|
hep-ph hep-ex
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
In this review I give an overview on the conceptual issues involved in the
question how to interpret so-called `direct top quark mass measurements', which
are based on the kinematic reconstruction of top quark decay products at the
Large Hadron Collider (LHC). These measurements quote the top mass parameter
$m_t^{\rm MC}$ of Monte-Carlo event generators with current uncertainties of
around $0.5$ GeV. At present time the problem of finding a rigorous relation
between $m_t^{\rm MC}$ and top mass renormalization schemes defined in field
theory is unresolved and touches perturbative as well as nonperturbative
aspects and the limitations of state-of-the-art Monte-Carlo event generators. I
review the status of LHC top mass measurements, illustrate how conceptual
limitations enter and explain a controversy that has permeated the community in
the context of the interpretation problem. Recent advances in acquiring first
principle insights are summarized, and it is outlined what else has to be
understood to fully resolve the issue. For the time being, I give a
recommendation how to deal with the interpretation problem when making top mass
dependent theoretical predictions.
|
[
{
"created": "Mon, 27 Apr 2020 16:28:38 GMT",
"version": "v1"
}
] |
2020-04-28
|
[
[
"Hoang",
"André H.",
""
]
] |
In this review I give an overview on the conceptual issues involved in the question how to interpret so-called `direct top quark mass measurements', which are based on the kinematic reconstruction of top quark decay products at the Large Hadron Collider (LHC). These measurements quote the top mass parameter $m_t^{\rm MC}$ of Monte-Carlo event generators with current uncertainties of around $0.5$ GeV. At present time the problem of finding a rigorous relation between $m_t^{\rm MC}$ and top mass renormalization schemes defined in field theory is unresolved and touches perturbative as well as nonperturbative aspects and the limitations of state-of-the-art Monte-Carlo event generators. I review the status of LHC top mass measurements, illustrate how conceptual limitations enter and explain a controversy that has permeated the community in the context of the interpretation problem. Recent advances in acquiring first principle insights are summarized, and it is outlined what else has to be understood to fully resolve the issue. For the time being, I give a recommendation how to deal with the interpretation problem when making top mass dependent theoretical predictions.
|
hep-ph/0412288
|
Cecilia Jarlskog
|
C. Jarlskog
|
Invariants of Lepton Mass Matrices and CP and T Violation in Neutrino
Oscillations
|
9 pages
|
Phys.Lett. B609 (2005) 323-329
|
10.1016/j.physletb.2005.01.057
| null |
hep-ph
| null |
CP and T asymmetries in neutrino oscillations, in vacuum as well as in
matter, are expressed in terms of invariant functions of lepton mass matrices.
|
[
{
"created": "Mon, 20 Dec 2004 13:47:47 GMT",
"version": "v1"
}
] |
2009-11-10
|
[
[
"Jarlskog",
"C.",
""
]
] |
CP and T asymmetries in neutrino oscillations, in vacuum as well as in matter, are expressed in terms of invariant functions of lepton mass matrices.
|
hep-ph/0208209
|
Howard E. Haber
|
Marcela Carena and Howard E. Haber
|
Higgs Boson Theory and Phenomenology
|
90 pages, 31 figures. Revised version. To be published in Progress in
Particle and Nuclear Physics. This paper with higher resolution figures can
be found at http://scipp.ucsc.edu/~haber/higgsreview/higgsrev.ps
|
Prog.Part.Nucl.Phys.50:63-152,2003
|
10.1016/S0146-6410(02)00177-1
|
FERMILAB-Pub-02/114-T and SCIPP 02/07
|
hep-ph
| null |
Precision electroweak data presently favors a weakly-coupled Higgs sector as
the mechanism responsible for electroweak symmetry breaking. Low-energy
supersymmetry provides a natural framework for weakly-coupled elementary
scalars. In this review, we summarize the theoretical properties of the
Standard Model (SM) Higgs boson and the Higgs sector of the minimal
supersymmetric extension of the Standard Model (MSSM). We then survey the
phenomenology of the SM and MSSM Higgs bosons at the Tevatron, LHC and a future
e+e- linear collider. We focus on the Higgs discovery potential of present and
future colliders and stress the importance of precision measurements of Higgs
boson properties.
|
[
{
"created": "Fri, 23 Aug 2002 08:43:32 GMT",
"version": "v1"
},
{
"created": "Tue, 22 Oct 2002 08:45:55 GMT",
"version": "v2"
},
{
"created": "Fri, 13 Dec 2002 09:23:51 GMT",
"version": "v3"
}
] |
2008-11-26
|
[
[
"Carena",
"Marcela",
""
],
[
"Haber",
"Howard E.",
""
]
] |
Precision electroweak data presently favors a weakly-coupled Higgs sector as the mechanism responsible for electroweak symmetry breaking. Low-energy supersymmetry provides a natural framework for weakly-coupled elementary scalars. In this review, we summarize the theoretical properties of the Standard Model (SM) Higgs boson and the Higgs sector of the minimal supersymmetric extension of the Standard Model (MSSM). We then survey the phenomenology of the SM and MSSM Higgs bosons at the Tevatron, LHC and a future e+e- linear collider. We focus on the Higgs discovery potential of present and future colliders and stress the importance of precision measurements of Higgs boson properties.
|
1505.04832
|
Morgan Lynch
|
Morgan H. Lynch
|
Electron decay at IceCube
|
13 pages, 4 figures
| null | null | null |
hep-ph gr-qc hep-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
In this paper we apply the formalism of Accelerated Quantum Dynamics (AQD) to
the radiative stopping of highly relativistic electrons in ice. We compute the
acceleration profile of the electron along with its lifetime to decay into a
muon. The Planckian spectrum of the emitted muon along with the its generalized
displacement law are presented and used to quantify the muons properties. The
results predict the acceleration-induced decay of electrons at IceCube
energies. The signal of electron decay at IceCube manifests itself as an excess
of track topologies in an energy window accessible experimentally. This setting
has the potential to probe the Unruh effect as well investigate the flavor
content of cosmic ray neutrinos.
|
[
{
"created": "Mon, 18 May 2015 22:15:19 GMT",
"version": "v1"
},
{
"created": "Thu, 6 Aug 2015 21:31:09 GMT",
"version": "v2"
},
{
"created": "Thu, 19 Nov 2015 17:20:02 GMT",
"version": "v3"
}
] |
2015-11-20
|
[
[
"Lynch",
"Morgan H.",
""
]
] |
In this paper we apply the formalism of Accelerated Quantum Dynamics (AQD) to the radiative stopping of highly relativistic electrons in ice. We compute the acceleration profile of the electron along with its lifetime to decay into a muon. The Planckian spectrum of the emitted muon along with the its generalized displacement law are presented and used to quantify the muons properties. The results predict the acceleration-induced decay of electrons at IceCube energies. The signal of electron decay at IceCube manifests itself as an excess of track topologies in an energy window accessible experimentally. This setting has the potential to probe the Unruh effect as well investigate the flavor content of cosmic ray neutrinos.
|
1111.1421
|
Song Shu
|
Song Shu and Jia-Rong Li
|
The vacuum tunnelling and the crossover of deconfinement in
Friedberg-Lee model
|
10 pages, 6 figures
|
Nucl. Phys. A901 (2013) 1-13
|
10.1016/j.nuclphysa.2013.02.006
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We have discussed the vacuum tunnelling in Friedberg-Lee model. The
tunnelling coefficient is derived in the field configuration space by
calculating the transition amplitude using the path integral under the
stationary phase approximation and the dilute instanton gas approximation. By
studying the tunnelling effect between the two degenerating vacuums at the
critical temperature and chemical potential, we find that the system could be
deconfined by tunnelling, which could possibly change the first order
deconfinement phase transition to crossover.
|
[
{
"created": "Sun, 6 Nov 2011 13:47:37 GMT",
"version": "v1"
},
{
"created": "Sat, 4 Feb 2012 15:16:57 GMT",
"version": "v2"
},
{
"created": "Fri, 22 Mar 2013 13:03:07 GMT",
"version": "v3"
}
] |
2013-03-25
|
[
[
"Shu",
"Song",
""
],
[
"Li",
"Jia-Rong",
""
]
] |
We have discussed the vacuum tunnelling in Friedberg-Lee model. The tunnelling coefficient is derived in the field configuration space by calculating the transition amplitude using the path integral under the stationary phase approximation and the dilute instanton gas approximation. By studying the tunnelling effect between the two degenerating vacuums at the critical temperature and chemical potential, we find that the system could be deconfined by tunnelling, which could possibly change the first order deconfinement phase transition to crossover.
|
2307.01006
|
Dart-Yin Soh
|
Dart-yin A. Soh, Zhaoyi Qu
|
Innovative Polarimetry for High$-$energy Cosmic $\gamma$ and
$e^{+}/e^{-}$ Induced by Vector Photo$-$productionn
|
preliminary version
| null | null | null |
hep-ph astro-ph.HE
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
In this paper, we explore the possibility of measuring the complete
polarizations of cosmic photons $\gamma$ and the polarizations of cosmic
electrons $e^{-}$ and positrons $e^{+}$. Our innovative Vector Meson
Photo-production induced polarimetry enables people to measure the circular
plarization compoent of a $GeV$ $\gamma$ and to improve its linear polarization
measurement, and thus enables people to measure the polarization of $GeV$
$e^{+}/e^{-}$ for the first time. We calculate the production process of
$\pi^{+}\pi^{-}$ by a generally polarized photon near nucleon's field in a
generalized VPD-SDMEs Factorization with the fitted experimental data, so that
it's partially model-independent. We also propose the observables and approach
to measure their polarizations based on our calculations. Our new polarimetry
of high-energy cosmic $\gamma,e^{+},e^{-}$ will open a new window to reveal the
mysteries and solve the puzzles of BSM new physics in particle physics and
cosmology.
|
[
{
"created": "Mon, 3 Jul 2023 13:40:46 GMT",
"version": "v1"
}
] |
2023-07-04
|
[
[
"Soh",
"Dart-yin A.",
""
],
[
"Qu",
"Zhaoyi",
""
]
] |
In this paper, we explore the possibility of measuring the complete polarizations of cosmic photons $\gamma$ and the polarizations of cosmic electrons $e^{-}$ and positrons $e^{+}$. Our innovative Vector Meson Photo-production induced polarimetry enables people to measure the circular plarization compoent of a $GeV$ $\gamma$ and to improve its linear polarization measurement, and thus enables people to measure the polarization of $GeV$ $e^{+}/e^{-}$ for the first time. We calculate the production process of $\pi^{+}\pi^{-}$ by a generally polarized photon near nucleon's field in a generalized VPD-SDMEs Factorization with the fitted experimental data, so that it's partially model-independent. We also propose the observables and approach to measure their polarizations based on our calculations. Our new polarimetry of high-energy cosmic $\gamma,e^{+},e^{-}$ will open a new window to reveal the mysteries and solve the puzzles of BSM new physics in particle physics and cosmology.
|
2309.16554
|
Robert Mason
|
R.H. Mason, J.A. Gracey
|
Crewther's relation in different schemes
|
10 latex pages, 2 tables, 1 figure, proceedings of RADCOR2023
| null | null |
LTH 1351
|
hep-ph
|
http://creativecommons.org/licenses/by/4.0/
|
We examine Crewther's relation at high loop order in perturbative QCD and
demonstrate how the relation is accommodated in gauge-parameter dependent
schemes where the running of the gauge parameter has to be explicitly
considered. Motivated by ensuring that the conformal properties of the relation
are preserved at all the critical points of QCD, including the Banks-Zaks and
its infra-red stable twin, we demonstrate the necessity of an additional term
in the relation for describing gauge running in the minimal momentum
subtraction scheme (mMOM) and argue for its inclusion for all gauge-parameter
dependent schemes.
|
[
{
"created": "Thu, 28 Sep 2023 16:09:18 GMT",
"version": "v1"
},
{
"created": "Mon, 23 Oct 2023 21:42:09 GMT",
"version": "v2"
}
] |
2023-10-25
|
[
[
"Mason",
"R. H.",
""
],
[
"Gracey",
"J. A.",
""
]
] |
We examine Crewther's relation at high loop order in perturbative QCD and demonstrate how the relation is accommodated in gauge-parameter dependent schemes where the running of the gauge parameter has to be explicitly considered. Motivated by ensuring that the conformal properties of the relation are preserved at all the critical points of QCD, including the Banks-Zaks and its infra-red stable twin, we demonstrate the necessity of an additional term in the relation for describing gauge running in the minimal momentum subtraction scheme (mMOM) and argue for its inclusion for all gauge-parameter dependent schemes.
|
hep-ph/0112064
|
Tamas Csorgo
|
A. Ster and T. Csorgo
|
The reconstructed Big Bang from RHIC data
|
6 pages, contribution to EPS HEP 2001 conference, to appear in JHEP
|
PRHEP-hep2001 (2001) 241
| null | null |
hep-ph
| null |
The final state of $Au + Au$ collisions at sqrt{s}=130 AGeV at RHIC has been
reconstructed within the framework of the Buda-Lund hydro model, by performing
a simultaneous fit to preliminary PHENIX and STAR data on two-particle
Bose-Einstein correlations and identified single particle spectra. The Hubble
constant of the expanding final state of this heavy ion collision is determined
to be H = <u_t> = 0.77 +- 0.09.
|
[
{
"created": "Tue, 4 Dec 2001 23:00:55 GMT",
"version": "v1"
}
] |
2007-05-23
|
[
[
"Ster",
"A.",
""
],
[
"Csorgo",
"T.",
""
]
] |
The final state of $Au + Au$ collisions at sqrt{s}=130 AGeV at RHIC has been reconstructed within the framework of the Buda-Lund hydro model, by performing a simultaneous fit to preliminary PHENIX and STAR data on two-particle Bose-Einstein correlations and identified single particle spectra. The Hubble constant of the expanding final state of this heavy ion collision is determined to be H = <u_t> = 0.77 +- 0.09.
|
hep-ph/9406243
|
Kiselev
|
V.V.Kiselev
|
Scaling behaviour of leptonic decay constants for heavy quarkonia and
heavy mesons
|
IHEP 94-63, Protvino, Standard LATEX, 17 pages
| null | null | null |
hep-ph
| null |
In the framework of QCD sum rules one uses a scheme, allowing one to apply
the conditions of both nonrelativistic heavy quark motion inside mesons and
independence of nonsplitting nS-state density on the heavy quark flavours. In
the leading order an analitic expression is derived for leptonic constants of
both heavy quarkonia and heavy mesons with a single heavy quark. The expression
allows one explicitly to determine scaling properties of the constants.
|
[
{
"created": "Tue, 7 Jun 1994 16:35:15 GMT",
"version": "v1"
}
] |
2007-05-23
|
[
[
"Kiselev",
"V. V.",
""
]
] |
In the framework of QCD sum rules one uses a scheme, allowing one to apply the conditions of both nonrelativistic heavy quark motion inside mesons and independence of nonsplitting nS-state density on the heavy quark flavours. In the leading order an analitic expression is derived for leptonic constants of both heavy quarkonia and heavy mesons with a single heavy quark. The expression allows one explicitly to determine scaling properties of the constants.
|
1210.3008
|
Martin Block
|
Martin M. Block and Francis Halzen
|
Commentary on "Total Hadronic Cross Section Data and the
Froissart-Martin Bound", by Fagundes, Menon and Silva
|
5 pages, 3 figures, to be published Brazilian Journal of Physics, Vol
42. arXiv admin note: substantial text overlap with arXiv:1208.4086
| null |
10.1007/s13538-012-0103-0
| null |
hep-ph hep-ex
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
This Commentary on the paper "Total Hadronic Cross Section Data and the
Froissart-Martin Bound", by Fagundes, Menon and Silva, to be published in Braz.
J. of Phys., Vol. 42 (2012) (arXiv 1112.4704), was invited by the Editors of
the Brazilian Journal of Physics to appear directly after the above authors'
printed version, in the same journal issue. We here challenge that paper's
conclusions that the Froissart bound was violated. We will show that this
conclusion follows from a statistical methodology that we question, and will
present compelling supplementary evidence that the latest ultra-high energy
experimental $pp$ cross section data are consistent with a $\ln^2 s$ behavior
that satisfies the Froissart bound.
|
[
{
"created": "Wed, 10 Oct 2012 19:19:19 GMT",
"version": "v1"
}
] |
2012-10-11
|
[
[
"Block",
"Martin M.",
""
],
[
"Halzen",
"Francis",
""
]
] |
This Commentary on the paper "Total Hadronic Cross Section Data and the Froissart-Martin Bound", by Fagundes, Menon and Silva, to be published in Braz. J. of Phys., Vol. 42 (2012) (arXiv 1112.4704), was invited by the Editors of the Brazilian Journal of Physics to appear directly after the above authors' printed version, in the same journal issue. We here challenge that paper's conclusions that the Froissart bound was violated. We will show that this conclusion follows from a statistical methodology that we question, and will present compelling supplementary evidence that the latest ultra-high energy experimental $pp$ cross section data are consistent with a $\ln^2 s$ behavior that satisfies the Froissart bound.
|
hep-ph/9611424
|
U. Meissner
|
Ulf-G. Mei{\ss}ner
|
Nucleon form factors: From the space-like to the time-like region
|
11 pp, LaTeX, uses epsf and espcrc1.sty, 6 figures, invited talk,
DAPHCE 96, Frascati, November 1996, to appear in the proceedings (Nucl. Phys.
A)
|
Nucl.Phys. A623 (1997) 340c-350c
|
10.1016/S0375-9474(97)00453-3
|
KFA-IKP(TH)-1996-15
|
hep-ph nucl-th
| null |
I discuss how dispersion relations can be used to analyse the nucleon
electromagnetic form factors, with particular emphasis on the constraints from
unitarity and pQCD. Results for nucleon radii, vector-meson couplings, the
onset of pQCD and bounds on the strangeness form factors are presented. The em
form factors in the time-like region reveal some interesting physics which is
not yet understood in full detail. The need for a better data basis at low,
intermediate and large momentum transfer and also in the time-like region is
stressed.
|
[
{
"created": "Tue, 26 Nov 1996 07:33:26 GMT",
"version": "v1"
}
] |
2009-10-30
|
[
[
"Meißner",
"Ulf-G.",
""
]
] |
I discuss how dispersion relations can be used to analyse the nucleon electromagnetic form factors, with particular emphasis on the constraints from unitarity and pQCD. Results for nucleon radii, vector-meson couplings, the onset of pQCD and bounds on the strangeness form factors are presented. The em form factors in the time-like region reveal some interesting physics which is not yet understood in full detail. The need for a better data basis at low, intermediate and large momentum transfer and also in the time-like region is stressed.
|
hep-ph/9504296
| null |
S. Dimopoulos, G.F. Giudice, and N. Tetradis
|
Disoriented and Plastic Soft Terms: A Dynamical Solution to the Problem
of Supersymmetric Flavor Violations
|
16 pages, LATEX, CERN-TH/95-90
|
Nucl.Phys. B454 (1995) 59-74
|
10.1016/0550-3213(95)00395-9
| null |
hep-ph hep-th
| null |
We postulate that the orientation of the soft supersymmetry-breaking terms in
flavor space is not fixed by tree level physics at the Planck scale; it is a
dynamical variable which depends on fields that have no tree level potential.
These fields can be thought of as either moduli or as the Nambu-Goldstone
bosons of the spontaneously broken flavor symmetry which is non-linearly
realized by the soft terms. We show that the soft terms align with the quark
and lepton Yukawa couplings, just as spins align with an external magnetic
field. As a result, the soft terms conserve individual lepton numbers and do
not cause large flavor or CP violations. The vacuum adjusts so as to allow
large sparticle splittings to naturally coexist with flavor conservation.
Consequently, the resulting phenomenology is different from that of minimal
supersymmetric theories. We also propose theories in which the shape of the
soft terms in flavor space is a dynamical variable which depends on fields that
have no tree level potential. This dynamically leads to partial degeneracy
among sparticles and further supression of flavor violations. The ideas of this
paper suggest a connection between the space of moduli and the spontaneously
broken flavor group.
|
[
{
"created": "Thu, 13 Apr 1995 14:11:31 GMT",
"version": "v1"
},
{
"created": "Fri, 30 Jun 1995 16:34:02 GMT",
"version": "v2"
}
] |
2009-10-28
|
[
[
"Dimopoulos",
"S.",
""
],
[
"Giudice",
"G. F.",
""
],
[
"Tetradis",
"N.",
""
]
] |
We postulate that the orientation of the soft supersymmetry-breaking terms in flavor space is not fixed by tree level physics at the Planck scale; it is a dynamical variable which depends on fields that have no tree level potential. These fields can be thought of as either moduli or as the Nambu-Goldstone bosons of the spontaneously broken flavor symmetry which is non-linearly realized by the soft terms. We show that the soft terms align with the quark and lepton Yukawa couplings, just as spins align with an external magnetic field. As a result, the soft terms conserve individual lepton numbers and do not cause large flavor or CP violations. The vacuum adjusts so as to allow large sparticle splittings to naturally coexist with flavor conservation. Consequently, the resulting phenomenology is different from that of minimal supersymmetric theories. We also propose theories in which the shape of the soft terms in flavor space is a dynamical variable which depends on fields that have no tree level potential. This dynamically leads to partial degeneracy among sparticles and further supression of flavor violations. The ideas of this paper suggest a connection between the space of moduli and the spontaneously broken flavor group.
|
1409.6202
|
Yacine Mehtar-Tani
|
Jean-Paul Blaizot, Leonard Fister, Yacine Mehtar-Tani
|
Angular distribution of medium-induced QCD cascades
|
20 pages, 3 figures
| null |
10.1016/j.nuclphysa.2015.03.014
| null |
hep-ph nucl-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We provide a complete description of the angular distribution of gluons in a
medium-induced QCD cascade. We identify two components in the distribution, a
soft component dominated by soft multiple scatterings, and a hard component
dominated by a few hard scatterings. The typical angle that marks the boundary
between these two components is determined analytically as a function of the
energy of the observed gluon and the size of the medium. We construct the
complete solution (beyond the diffusion approximation) in the regime where
multiple branchings dominate the dynamics of the cascade in the form of a power
series in the number of collisions with the medium particles. The coefficients
of this expansions are related to the moments of the distribution in the
diffusion approximation and are determined analytically. The angular
distribution may be useful in phenomenological studies of jet shapes in
heavy-ion collisions.
|
[
{
"created": "Mon, 22 Sep 2014 15:34:27 GMT",
"version": "v1"
}
] |
2015-05-20
|
[
[
"Blaizot",
"Jean-Paul",
""
],
[
"Fister",
"Leonard",
""
],
[
"Mehtar-Tani",
"Yacine",
""
]
] |
We provide a complete description of the angular distribution of gluons in a medium-induced QCD cascade. We identify two components in the distribution, a soft component dominated by soft multiple scatterings, and a hard component dominated by a few hard scatterings. The typical angle that marks the boundary between these two components is determined analytically as a function of the energy of the observed gluon and the size of the medium. We construct the complete solution (beyond the diffusion approximation) in the regime where multiple branchings dominate the dynamics of the cascade in the form of a power series in the number of collisions with the medium particles. The coefficients of this expansions are related to the moments of the distribution in the diffusion approximation and are determined analytically. The angular distribution may be useful in phenomenological studies of jet shapes in heavy-ion collisions.
|
1811.06434
|
Xu Cao
|
Xu Cao, Jian-Ping Dai
|
The spin parity of $Z_c^-$(4100), $Z_1^+$(4050) and $Z_2^+$(4250)
|
10 pages,published version
|
Phys. Rev. D 100, 054004 (2019)
|
10.1103/PhysRevD.100.054004
| null |
hep-ph nucl-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We conjecture that $Z_c^-$(4100) found by LHCb group from a Dalitz plot
analysis of $B^0\to \eta_c K^+\pi^-$ decay is the charge conjugate of
$Z_1^+$(4050) observed in $\chi_{c1}\pi^+$ distribution from Belle
collaboration. Some interesting conclusions are inferred from this assumption.
The $Z_2$(4250) would be assigned to be a $J^P = 1^+$ or $1^-$ state because of
its absence in $\eta_{c}\pi^-$ invariant mass distribution, while
$Z_1^+$(4050)/$Z_c^-$(4100) could be a $0^+$ or $1^-$ state but $2^+$ is
unfavored because it would be coupled to $\eta_{c}\pi$ in $D$-wave. The null
observation of $Z_1 Z_2$, $Z_1 Z_1$ and $Z_2 Z_2$ production in $e^+ e^-$
annihilation and $\Upsilon(1S,2S)$ decay by Belle collaboration would further
allocate the spin parity combination of $Z_1^+$(4050)/$Z_c^-$(4100) and
$Z_2$(4250). Our deductions can be used to exclude a set of proposed models and
could be further tested by future experiment, e.g. in $\gamma \gamma$
collisions.
|
[
{
"created": "Thu, 15 Nov 2018 15:42:49 GMT",
"version": "v1"
},
{
"created": "Mon, 25 Mar 2019 11:20:57 GMT",
"version": "v2"
},
{
"created": "Sun, 2 Jun 2019 18:14:34 GMT",
"version": "v3"
},
{
"created": "Wed, 21 Aug 2019 02:16:06 GMT",
"version": "v4"
}
] |
2019-09-11
|
[
[
"Cao",
"Xu",
""
],
[
"Dai",
"Jian-Ping",
""
]
] |
We conjecture that $Z_c^-$(4100) found by LHCb group from a Dalitz plot analysis of $B^0\to \eta_c K^+\pi^-$ decay is the charge conjugate of $Z_1^+$(4050) observed in $\chi_{c1}\pi^+$ distribution from Belle collaboration. Some interesting conclusions are inferred from this assumption. The $Z_2$(4250) would be assigned to be a $J^P = 1^+$ or $1^-$ state because of its absence in $\eta_{c}\pi^-$ invariant mass distribution, while $Z_1^+$(4050)/$Z_c^-$(4100) could be a $0^+$ or $1^-$ state but $2^+$ is unfavored because it would be coupled to $\eta_{c}\pi$ in $D$-wave. The null observation of $Z_1 Z_2$, $Z_1 Z_1$ and $Z_2 Z_2$ production in $e^+ e^-$ annihilation and $\Upsilon(1S,2S)$ decay by Belle collaboration would further allocate the spin parity combination of $Z_1^+$(4050)/$Z_c^-$(4100) and $Z_2$(4250). Our deductions can be used to exclude a set of proposed models and could be further tested by future experiment, e.g. in $\gamma \gamma$ collisions.
|
1509.00874
|
Kamakshya Prasad Modak
|
Kamakshya Prasad Modak
|
Constraining Effective Self Interactions of Fermionic Dark Matter
|
26 pages, 4 figures
| null | null | null |
hep-ph astro-ph.CO astro-ph.GA astro-ph.HE
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
The idea of Dark Matter (DM) with self interaction was invoked to resolve a
number of discrepancies between the simulation based predictions by
collisionless cold DM and the astrophysical observations on galactic and
subgalactic scales. Evidences for self interaction would have striking
implications for particle nature of DM. In order to reconcile such
astrophysical observations for self interaction with particle properties for
DM, we consider the general scenario of self interacting Dirac fermionic DM,
$\chi$. Also since the exact particle physics model for DM is yet to be probed,
we simply adopt the effective model independent framework for DM self
interaction which occurs via the most general effective 4-fermion operators
invariant under both Lorentz and CPT transformations. From the thorough
investigation of the interrelations among the parameters in this framework,
namely, the effective DM self couplings ($G_{i}$), DM mass ($m_{\chi}$) and
relative velocity ($v_{\rm rel}$), it can be inferred that $G_{i}$ decrease
with increasing $m_{\chi}$ for a given DM self interaction strength. Moreover,
for few types of effective operators the values of $G_{i}$ fall off with
increasing $v_{\rm rel}$ while they remain roughly constant for a wide range of
$v_{\rm rel}$ for other cases. In addition, the parameter space in this
framework is constrained by the claimed observational results of ${\sigma \over
m_{\chi}}$ on cluster scales (Abell 3827, Bullet Cluster) after averaging the
DM self interaction cross sections over DM velocity distribution in the
cluster. This puts interesting constraints on the values of effective DM self
couplings for different fermionic DM masses for various effective operators
(scalar, vector, etc.) of DM self interactions in this scenario. Some other
implications of DM effective self interaction are also discussed in this model
independent framework.
|
[
{
"created": "Wed, 2 Sep 2015 20:57:42 GMT",
"version": "v1"
}
] |
2015-09-04
|
[
[
"Modak",
"Kamakshya Prasad",
""
]
] |
The idea of Dark Matter (DM) with self interaction was invoked to resolve a number of discrepancies between the simulation based predictions by collisionless cold DM and the astrophysical observations on galactic and subgalactic scales. Evidences for self interaction would have striking implications for particle nature of DM. In order to reconcile such astrophysical observations for self interaction with particle properties for DM, we consider the general scenario of self interacting Dirac fermionic DM, $\chi$. Also since the exact particle physics model for DM is yet to be probed, we simply adopt the effective model independent framework for DM self interaction which occurs via the most general effective 4-fermion operators invariant under both Lorentz and CPT transformations. From the thorough investigation of the interrelations among the parameters in this framework, namely, the effective DM self couplings ($G_{i}$), DM mass ($m_{\chi}$) and relative velocity ($v_{\rm rel}$), it can be inferred that $G_{i}$ decrease with increasing $m_{\chi}$ for a given DM self interaction strength. Moreover, for few types of effective operators the values of $G_{i}$ fall off with increasing $v_{\rm rel}$ while they remain roughly constant for a wide range of $v_{\rm rel}$ for other cases. In addition, the parameter space in this framework is constrained by the claimed observational results of ${\sigma \over m_{\chi}}$ on cluster scales (Abell 3827, Bullet Cluster) after averaging the DM self interaction cross sections over DM velocity distribution in the cluster. This puts interesting constraints on the values of effective DM self couplings for different fermionic DM masses for various effective operators (scalar, vector, etc.) of DM self interactions in this scenario. Some other implications of DM effective self interaction are also discussed in this model independent framework.
|
2007.11586
|
Benjamin Nachman
|
Benjamin Nachman and Jesse Thaler
|
A Neural Resampler for Monte Carlo Reweighting with Preserved
Uncertainties
|
12 pages, 3 figures, no negative weights; v2: to match journal
version
|
Phys. Rev. D 102, 076004 (2020)
|
10.1103/PhysRevD.102.076004
|
MIT-CTP 5224
|
hep-ph hep-ex physics.data-an
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Monte Carlo event generators are an essential tool for data analysis in
collider physics. To include subleading quantum corrections, these generators
often need to produce negative weight events, which leads to statistical
dilution of the datasets and downstream computational costs for detector
simulation. Building on the recent proposal of a positive resampler method to
rebalance weights within histogram bins, we introduce neural resampling: an
unbinned approach to Monte Carlo reweighting based on neural networks that
scales well to high-dimensional and variable-dimensional phase space. We pay
particular attention to preserving the statistical properties of the event
sample, such that neural resampling not only maintains the mean value of any
observable but also its Monte Carlo uncertainty. This uncertainty preservation
scheme is general and can also be applied to binned (non-neural network)
resampling. To illustrate our neural resampling approach, we present a case
study from the Large Hadron Collider of top quark pair production at
next-to-leading order matched to a parton shower.
|
[
{
"created": "Wed, 22 Jul 2020 18:00:01 GMT",
"version": "v1"
},
{
"created": "Fri, 16 Oct 2020 19:10:40 GMT",
"version": "v2"
}
] |
2020-10-21
|
[
[
"Nachman",
"Benjamin",
""
],
[
"Thaler",
"Jesse",
""
]
] |
Monte Carlo event generators are an essential tool for data analysis in collider physics. To include subleading quantum corrections, these generators often need to produce negative weight events, which leads to statistical dilution of the datasets and downstream computational costs for detector simulation. Building on the recent proposal of a positive resampler method to rebalance weights within histogram bins, we introduce neural resampling: an unbinned approach to Monte Carlo reweighting based on neural networks that scales well to high-dimensional and variable-dimensional phase space. We pay particular attention to preserving the statistical properties of the event sample, such that neural resampling not only maintains the mean value of any observable but also its Monte Carlo uncertainty. This uncertainty preservation scheme is general and can also be applied to binned (non-neural network) resampling. To illustrate our neural resampling approach, we present a case study from the Large Hadron Collider of top quark pair production at next-to-leading order matched to a parton shower.
|
hep-ph/0306012
|
Andreas Freund
|
A.Freund
|
A detailed QCD analysis of twist-3 effects in DVCS observables
|
18 pages, 21 figures, uses Revtex4, final version to be published in
PRD, minor revisions due to referee suggestions
|
Phys.Rev. D68 (2003) 096006
|
10.1103/PhysRevD.68.096006
| null |
hep-ph
| null |
In this paper I present a detailed QCD analysis of twist-3 effects in the
Wandzura-Wilczek (WW) approximation in deeply virtual Compton scattering (DVCS)
observables for various kinematical settings, representing the HERA, HERMES,
CLAS and the planned EIC (electron-ion-collider) experiments. I find that the
twist-3 effects in the WW approximation are almost always negligible at
collider energies but can be large for low Q^2 and smaller x_bj in observables
for the lower energy, fixed target experiments directly sensitive to the real
part of DVCS amplitudes like the charge asymmetry (CA). Conclusions are then
drawn about the reliability of extracting twist-2 generalized parton
distributions (GPDs) from experimental data and a first, phenomenological,
parameterization of the LO and NLO twist-2 GPD $H$, describing all the
currently available DVCS data within the experimental errors is given.
|
[
{
"created": "Mon, 2 Jun 2003 11:16:01 GMT",
"version": "v1"
},
{
"created": "Wed, 11 Jun 2003 15:22:38 GMT",
"version": "v2"
},
{
"created": "Tue, 14 Oct 2003 08:03:53 GMT",
"version": "v3"
}
] |
2009-11-10
|
[
[
"Freund",
"A.",
""
]
] |
In this paper I present a detailed QCD analysis of twist-3 effects in the Wandzura-Wilczek (WW) approximation in deeply virtual Compton scattering (DVCS) observables for various kinematical settings, representing the HERA, HERMES, CLAS and the planned EIC (electron-ion-collider) experiments. I find that the twist-3 effects in the WW approximation are almost always negligible at collider energies but can be large for low Q^2 and smaller x_bj in observables for the lower energy, fixed target experiments directly sensitive to the real part of DVCS amplitudes like the charge asymmetry (CA). Conclusions are then drawn about the reliability of extracting twist-2 generalized parton distributions (GPDs) from experimental data and a first, phenomenological, parameterization of the LO and NLO twist-2 GPD $H$, describing all the currently available DVCS data within the experimental errors is given.
|
1703.08572
|
Matthew Schwartz
|
Matthew D. Schwartz, Kai Yan, Hua Xing Zhu
|
Collinear factorization violation and effective field theory
|
55 Pages, 5 figures
|
Phys. Rev. D 96, 056005 (2017)
|
10.1103/PhysRevD.96.056005
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
The factorization of amplitudes into hard, soft and collinear parts is known
to be violated in situations where incoming particles are collinear to outgoing
ones. This result was first derived by studying limits where non-collinear
particles become collinear. We show that through an effective field theory
framework with Glauber operators, these factorization-violating effects can be
reproduced from an amplitude that is factorized before the splitting occurs. We
confirm results at one-loop, through single Glauber exchange, and at two-loops,
through double Glauber exchange. To approach the calculation, we begin by
reviewing the importance of Glauber scaling for factorization. We show that for
any situation where initial state and final state particles are not collinear,
the Glauber contribution is entirely contained in the soft contribution. The
contributions coming from Glauber operators are necessarily non-analytic
functions of external momentum, with the non-analyticity arising from the
rapidity regulator. The non-analyticity is critical so that Glauber operators
can both preserve factorization when it holds and produce
factorization-violating effects when they are present.
|
[
{
"created": "Fri, 24 Mar 2017 19:02:14 GMT",
"version": "v1"
}
] |
2017-09-20
|
[
[
"Schwartz",
"Matthew D.",
""
],
[
"Yan",
"Kai",
""
],
[
"Zhu",
"Hua Xing",
""
]
] |
The factorization of amplitudes into hard, soft and collinear parts is known to be violated in situations where incoming particles are collinear to outgoing ones. This result was first derived by studying limits where non-collinear particles become collinear. We show that through an effective field theory framework with Glauber operators, these factorization-violating effects can be reproduced from an amplitude that is factorized before the splitting occurs. We confirm results at one-loop, through single Glauber exchange, and at two-loops, through double Glauber exchange. To approach the calculation, we begin by reviewing the importance of Glauber scaling for factorization. We show that for any situation where initial state and final state particles are not collinear, the Glauber contribution is entirely contained in the soft contribution. The contributions coming from Glauber operators are necessarily non-analytic functions of external momentum, with the non-analyticity arising from the rapidity regulator. The non-analyticity is critical so that Glauber operators can both preserve factorization when it holds and produce factorization-violating effects when they are present.
|
hep-ph/0105166
|
Andrzej Zembrzuski
|
Maria Krawczyk and Andrzej Zembrzuski (Institute of Theoretical
Physics, Warsaw University, Poland)
|
Photoproduction of the isolated photon at HERA in NLO QCD
|
latex file, 16 pages, 14 ps figures, formulae corrected, small
improvements in the text
|
Phys.Rev.D64:114017,2001
|
10.1103/PhysRevD.64.114017
| null |
hep-ph
| null |
The NLO QCD calculation for the photoproduction of the isolated photon with a
large pT at the HERA ep collider is presented. The single resolved photon
contribution and the QCD corrections of order alpha_s to the Born term are
consistently included. The NNLO contributions, the box and the double resolved
photon subprocesses, are sizeable and are taken into account in addition. The
importance of the isolation cut, as well as the influence of other experimental
cuts on pT and final photon rapidity distributions are discussed in detail. The
investigation of the renormalization scale dependence is performed in order to
estimate the size of missing higher order QCD corrections. Results are compared
with experimental data and with the prediction of a different NLO calculation.
|
[
{
"created": "Wed, 16 May 2001 23:14:29 GMT",
"version": "v1"
},
{
"created": "Sat, 19 May 2001 18:10:13 GMT",
"version": "v2"
}
] |
2011-07-19
|
[
[
"Krawczyk",
"Maria",
"",
"Institute of Theoretical\n Physics, Warsaw University, Poland"
],
[
"Zembrzuski",
"Andrzej",
"",
"Institute of Theoretical\n Physics, Warsaw University, Poland"
]
] |
The NLO QCD calculation for the photoproduction of the isolated photon with a large pT at the HERA ep collider is presented. The single resolved photon contribution and the QCD corrections of order alpha_s to the Born term are consistently included. The NNLO contributions, the box and the double resolved photon subprocesses, are sizeable and are taken into account in addition. The importance of the isolation cut, as well as the influence of other experimental cuts on pT and final photon rapidity distributions are discussed in detail. The investigation of the renormalization scale dependence is performed in order to estimate the size of missing higher order QCD corrections. Results are compared with experimental data and with the prediction of a different NLO calculation.
|
2209.00257
|
Chia-Wei Liu
|
Hai-Yang Cheng, Chia-Wei Liu and Fanrong Xu
|
Heavy-Flavor-Conserving Hadronic Weak Decays of Charmed and Bottom
Baryons: an Update
|
25 pages
| null |
10.1103/PhysRevD.106.093005
| null |
hep-ph hep-ex
|
http://creativecommons.org/licenses/by/4.0/
|
This paper serves as an update of the previous work entitled
``Heavy-Flavor-Conserving Hadronic Weak Decays of Charmed and Bottom Baryons".
We make an improvement on the bag wave functions by removing the center-of-mass
motion of the bag. All the baryon matrix elements are now calculated under the
same framework without introducing new parameters. The matrix elements of
4-quark operators are found to be nearly twice larger than the previous ones.
The calculated branching fractions of $ \Xi_c ^0 \to \Lambda_c ^+\pi^-$ and
$\Xi_b^- \to \Lambda^0_b \pi^-$ are both in agreement with current experimental
results. For the yet-to-be-measured heavy-flavor-conserving decays, we find
${\cal B}( \Xi_c ^+ \to \Lambda_c ^+\pi^0) = (13.8 \pm 1.4)\times 10^{-3}$,
${\cal B}( \Xi_b^0 \to \Lambda^0_b \pi^0) = (2.6 \pm 0.3)\times 10^{-3}$,
${\cal B}( \Omega_c ^0 \to \Xi_c^+\pi^-) = (2.0 \pm 0.2)\times 10^{-3}$ and
${\cal B}( \Omega_c ^0 \to \Xi_c^0\pi^0)= (1.1 \pm 0.1)\times 10^{-3}$. They
are all accessible to LHCb, Belle and Belle II and can be tested in the near
future.
|
[
{
"created": "Thu, 1 Sep 2022 06:36:28 GMT",
"version": "v1"
}
] |
2022-11-23
|
[
[
"Cheng",
"Hai-Yang",
""
],
[
"Liu",
"Chia-Wei",
""
],
[
"Xu",
"Fanrong",
""
]
] |
This paper serves as an update of the previous work entitled ``Heavy-Flavor-Conserving Hadronic Weak Decays of Charmed and Bottom Baryons". We make an improvement on the bag wave functions by removing the center-of-mass motion of the bag. All the baryon matrix elements are now calculated under the same framework without introducing new parameters. The matrix elements of 4-quark operators are found to be nearly twice larger than the previous ones. The calculated branching fractions of $ \Xi_c ^0 \to \Lambda_c ^+\pi^-$ and $\Xi_b^- \to \Lambda^0_b \pi^-$ are both in agreement with current experimental results. For the yet-to-be-measured heavy-flavor-conserving decays, we find ${\cal B}( \Xi_c ^+ \to \Lambda_c ^+\pi^0) = (13.8 \pm 1.4)\times 10^{-3}$, ${\cal B}( \Xi_b^0 \to \Lambda^0_b \pi^0) = (2.6 \pm 0.3)\times 10^{-3}$, ${\cal B}( \Omega_c ^0 \to \Xi_c^+\pi^-) = (2.0 \pm 0.2)\times 10^{-3}$ and ${\cal B}( \Omega_c ^0 \to \Xi_c^0\pi^0)= (1.1 \pm 0.1)\times 10^{-3}$. They are all accessible to LHCb, Belle and Belle II and can be tested in the near future.
|
1604.01213
|
Seokhoon Yun
|
Hye-Sung Lee, Seokhoon Yun
|
Mini Force: the (B-L) + xY gauge interaction with a light mediator
|
Version published in PRD
|
Phys. Rev. D 93, 115028 (2016)
|
10.1103/PhysRevD.93.115028
|
CTPU-16-11
|
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
The relevant phenomenology and the best search schemes of a
subelectroweak-scale gauge boson can be vastly different depending on its
coupling. For instance, the rare decay into a light gauge boson and the high
precision parity test can be sensitive if it has an axial coupling. The minimal
gauge extension of the standard model with the U(1)_{B-L + xY} requires only
three right-handed neutrinos, well-suited to the current neutrino mass and
mixing data, and no additional exotic matter fields. We study the light gauge
boson of this symmetry in detail including its axial coupling property from the
hypercharge shift.
|
[
{
"created": "Tue, 5 Apr 2016 10:42:02 GMT",
"version": "v1"
},
{
"created": "Tue, 28 Jun 2016 02:18:22 GMT",
"version": "v2"
}
] |
2016-06-29
|
[
[
"Lee",
"Hye-Sung",
""
],
[
"Yun",
"Seokhoon",
""
]
] |
The relevant phenomenology and the best search schemes of a subelectroweak-scale gauge boson can be vastly different depending on its coupling. For instance, the rare decay into a light gauge boson and the high precision parity test can be sensitive if it has an axial coupling. The minimal gauge extension of the standard model with the U(1)_{B-L + xY} requires only three right-handed neutrinos, well-suited to the current neutrino mass and mixing data, and no additional exotic matter fields. We study the light gauge boson of this symmetry in detail including its axial coupling property from the hypercharge shift.
|
hep-ph/9911365
|
Peter Richardson
|
Debajyoti Choudhury (Mehta Research Inst.), Herbi Dreiner (RAL), Peter
Richardson (Oxford), Subir Sarkar (Oxford)
|
A supersymmetric solution to the KARMEN time anomaly
|
13 pages, 7 postscript figures Note added commenting on recent NuTeV
search for unstable particle emitted in pion decay; Accepted for publication
in Phys. Rev. D
|
Phys.Rev.D61:095009,2000
|
10.1103/PhysRevD.61.095009
|
OUTP-99-59-P
|
hep-ph
| null |
We interpret the KARMEN time anomaly as being due to the production of a
(dominantly bino) neutralino with mass 33.9 MeV, which is the lightest
supersymmetric particle but decays into 3 leptons through the violation of
R-parity. For independent gaugino masses M_1 and M_2 we find regions in the
(M_1, M_2, mu, tan beta) parameter space where such a light neutralino is
consistent with all experiments. Future tests of this hypothesis are outlined.
|
[
{
"created": "Mon, 15 Nov 1999 18:10:04 GMT",
"version": "v1"
},
{
"created": "Thu, 3 Feb 2000 15:43:42 GMT",
"version": "v2"
}
] |
2011-02-16
|
[
[
"Choudhury",
"Debajyoti",
"",
"Mehta Research Inst."
],
[
"Dreiner",
"Herbi",
"",
"RAL"
],
[
"Richardson",
"Peter",
"",
"Oxford"
],
[
"Sarkar",
"Subir",
"",
"Oxford"
]
] |
We interpret the KARMEN time anomaly as being due to the production of a (dominantly bino) neutralino with mass 33.9 MeV, which is the lightest supersymmetric particle but decays into 3 leptons through the violation of R-parity. For independent gaugino masses M_1 and M_2 we find regions in the (M_1, M_2, mu, tan beta) parameter space where such a light neutralino is consistent with all experiments. Future tests of this hypothesis are outlined.
|
hep-ph/0503263
|
Richard Hill
|
Thomas Becher, Richard J. Hill, Matthias Neubert
|
Factorization in B->V gamma Decays
|
52 pages, 7 figures; references added and brief discussion of power
corrections included; version to appear in Phys. Rev. D
|
Phys.Rev.D72:094017,2005
|
10.1103/PhysRevD.72.094017
|
CLNS-05/1913, FERMILAB-PUB-05-032-T, SLAC-PUB-11045
|
hep-ph
| null |
The factorization properties of the radiative decays B->V gamma are analyzed
at leading order in 1/m_b using the soft-collinear effective theory. It is
shown that the decay amplitudes can be expressed in terms of a B->V form factor
evaluated at q^2=0, light-cone distribution amplitudes of the B and V mesons,
and calculable hard-scattering kernels. The renormalization-group equations in
the effective theory are solved to resum perturbative logarithms of the
different scales in the decay process. Phenomenological implications for the
B->K* gamma branching ratio, isospin asymmetry, and CP asymmetries are
discussed, with particular emphasis on possible effects from physics beyond the
Standard Model.
|
[
{
"created": "Mon, 28 Mar 2005 00:45:09 GMT",
"version": "v1"
},
{
"created": "Thu, 3 Nov 2005 23:56:07 GMT",
"version": "v2"
}
] |
2008-11-26
|
[
[
"Becher",
"Thomas",
""
],
[
"Hill",
"Richard J.",
""
],
[
"Neubert",
"Matthias",
""
]
] |
The factorization properties of the radiative decays B->V gamma are analyzed at leading order in 1/m_b using the soft-collinear effective theory. It is shown that the decay amplitudes can be expressed in terms of a B->V form factor evaluated at q^2=0, light-cone distribution amplitudes of the B and V mesons, and calculable hard-scattering kernels. The renormalization-group equations in the effective theory are solved to resum perturbative logarithms of the different scales in the decay process. Phenomenological implications for the B->K* gamma branching ratio, isospin asymmetry, and CP asymmetries are discussed, with particular emphasis on possible effects from physics beyond the Standard Model.
|
1311.1124
|
Kirill Tuchin
|
Kirill Tuchin
|
Coulomb corrections to photon and dilepton production in high energy pA
collisions
|
15 pages, 2 figures
|
Phys. Rev. C 89, 024904 (2014)
|
10.1103/PhysRevC.89.024904
| null |
hep-ph nucl-ex nucl-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We consider particle production in high energy pA collisions. In addition to
the coherent interactions with the nuclear color field, we take into account
coherent interactions with the nuclear electromagnetic Coulomb field. Employing
the dipole model, we sum up the leading multiple color and electromagnetic
interactions and derive inclusive cross sections for photon and dilepton
production. We found that the Coulomb corrections are up to $10\%$ at
$\sqrt{s}=200$~GeV per nucleon.
|
[
{
"created": "Tue, 5 Nov 2013 17:11:12 GMT",
"version": "v1"
}
] |
2014-02-19
|
[
[
"Tuchin",
"Kirill",
""
]
] |
We consider particle production in high energy pA collisions. In addition to the coherent interactions with the nuclear color field, we take into account coherent interactions with the nuclear electromagnetic Coulomb field. Employing the dipole model, we sum up the leading multiple color and electromagnetic interactions and derive inclusive cross sections for photon and dilepton production. We found that the Coulomb corrections are up to $10\%$ at $\sqrt{s}=200$~GeV per nucleon.
|
0910.1886
|
Alfredo Raya
|
Alejandro Ayala, Adnan Bashir, Alfredo Raya, Angel Sanchez
|
Impact of a uniform magnetic field and nonzero temperature on explicit
chiral symmetry breaking in QED: Arbitrary hierarchy of energy scales
|
16 pages, 6 figures, accepted in J. Phys. G
|
J.Phys.G37:015001,2010
|
10.1088/0954-3899/37/1/015001
| null |
hep-ph hep-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Employing the Schwinger's proper-time method, we calculate the $<\bar{\psi}
\psi>$-condensate for massive Dirac fermions of charge $e$ interacting with a
uniform magnetic field in a heat bath. We present general results for arbitrary
hierarchy of the energy scales involved, namely, the fermion mass $m$, the
magnetic field strength $\sqrt{eB}$ and temperature $T$. Moreover, we study
particular regimes in detail and reproduce some of the results calculated or
anticipated earlier in the literature. We also discuss possible applications of
our findings.
|
[
{
"created": "Sat, 10 Oct 2009 00:47:33 GMT",
"version": "v1"
}
] |
2010-01-15
|
[
[
"Ayala",
"Alejandro",
""
],
[
"Bashir",
"Adnan",
""
],
[
"Raya",
"Alfredo",
""
],
[
"Sanchez",
"Angel",
""
]
] |
Employing the Schwinger's proper-time method, we calculate the $<\bar{\psi} \psi>$-condensate for massive Dirac fermions of charge $e$ interacting with a uniform magnetic field in a heat bath. We present general results for arbitrary hierarchy of the energy scales involved, namely, the fermion mass $m$, the magnetic field strength $\sqrt{eB}$ and temperature $T$. Moreover, we study particular regimes in detail and reproduce some of the results calculated or anticipated earlier in the literature. We also discuss possible applications of our findings.
|
2105.09713
|
Qing-Hong Cao
|
Qing-Hong Cao, Nuo Chen, Hao-Ran Jiang, Bin Li, Yandong Liu
|
New Physics and Two Boosted W-jets plus Missing Energy
| null | null |
10.1088/1674-1137/ac0e8a
| null |
hep-ph hep-ex
|
http://creativecommons.org/licenses/by/4.0/
|
We show that the signature of two boosted $W$-jets plus large missing energy
is very promising to probe heavy charged resonances ($X^\pm$) through the
process of $pp\to X^+X^-\to W^+W^- X^0 X^0$ where $X^0$ denotes dark matter
candidate. The hadronic decay mode of the $W$ boson is considered to maximize
the number of signal events. When the mass split between $X^\pm$ and $X^0$ is
large, one has to utilize the jet-substructure technique to analyze the boosted
$W$-jet. For illustration we consider the process of chargino pair production
at the LHC, i.e., $pp\to \chi_1^+\chi^-_1 \to W^+W^-\chi_1^0\chi_1^0$, and
demonstrate that the proposed signature is able to cover more parameter space
of $m_{\chi_1^\pm}$ and $m_{\chi_1^0}$ than the conventional signature of
multiple leptons plus missing energy. More importantly, the signature of our
interests is not sensitive to the spin of heavy resonances.
|
[
{
"created": "Thu, 20 May 2021 12:53:52 GMT",
"version": "v1"
}
] |
2021-09-22
|
[
[
"Cao",
"Qing-Hong",
""
],
[
"Chen",
"Nuo",
""
],
[
"Jiang",
"Hao-Ran",
""
],
[
"Li",
"Bin",
""
],
[
"Liu",
"Yandong",
""
]
] |
We show that the signature of two boosted $W$-jets plus large missing energy is very promising to probe heavy charged resonances ($X^\pm$) through the process of $pp\to X^+X^-\to W^+W^- X^0 X^0$ where $X^0$ denotes dark matter candidate. The hadronic decay mode of the $W$ boson is considered to maximize the number of signal events. When the mass split between $X^\pm$ and $X^0$ is large, one has to utilize the jet-substructure technique to analyze the boosted $W$-jet. For illustration we consider the process of chargino pair production at the LHC, i.e., $pp\to \chi_1^+\chi^-_1 \to W^+W^-\chi_1^0\chi_1^0$, and demonstrate that the proposed signature is able to cover more parameter space of $m_{\chi_1^\pm}$ and $m_{\chi_1^0}$ than the conventional signature of multiple leptons plus missing energy. More importantly, the signature of our interests is not sensitive to the spin of heavy resonances.
|
0806.3566
|
David Bugg
|
D.V. Bugg (Queen Mary, University of London, UK)
|
Synchonisation of Resonances with Thresholds
|
8 pages, 4 figures. For Meson08 Proceedings. One important typo
corrected
| null |
10.1142/S0217751X09043729
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
The mechanism by which a resonance may be attracted to a sharp threshold is
described with several examples. It involves a threshold cusp interfering
constructively with either or both (i) a resonance produced via confinement,
(ii) attractive t- and u-channel exchanges. More generally, it is suggested
that resonances are eigenstates generated by mixing between confined states and
long-range meson and baryon exchanges.
|
[
{
"created": "Sun, 22 Jun 2008 13:19:43 GMT",
"version": "v1"
},
{
"created": "Sat, 5 Jul 2008 18:06:04 GMT",
"version": "v2"
}
] |
2009-11-13
|
[
[
"Bugg",
"D. V.",
"",
"Queen Mary, University of London, UK"
]
] |
The mechanism by which a resonance may be attracted to a sharp threshold is described with several examples. It involves a threshold cusp interfering constructively with either or both (i) a resonance produced via confinement, (ii) attractive t- and u-channel exchanges. More generally, it is suggested that resonances are eigenstates generated by mixing between confined states and long-range meson and baryon exchanges.
|
hep-ph/9703374
|
Athanasios Dedes,PhD Student
|
A. Dedes and K. Tamvakis
|
b-tau Unification and neutrino masses in SU(5) extensions of the MSSM
with radiative electroweak symmetry breaking
|
20 pages, LaTeX2e,uses psfig,5 figures,full postscript file available
at http://artemis.cc.uoi.gr/~adedes/new97.ps.gz
|
Phys.Rev. D56 (1997) 1496-1503
|
10.1103/PhysRevD.56.1496
|
IOA-05-97
|
hep-ph
| null |
We make a complete analysis of the Yukawa coupling unification in SU(5)
extensions of the MSSM in the framework of the radiative symmetry breaking
scenario. Both logarithmic and finite threshold corrections of sparticles have
been included in the determination of the gauge and Yukawa couplings at M_Z.
The effect of the heavy masses of each model in the renormalization group
equations is also included. We find that in the minimal SU(5) model b-tau
Yukawa unification can be achieved for too large a value of alpha_s. On the
other hand the Peccei-Quinn version of the Missing Doublet model, with the
effect of the right handed neutrino also included, exhibits b-tau unification
in excellent agreement with all low energy experimental data. Unification of
all Yukawa couplings is also discussed.
|
[
{
"created": "Thu, 20 Mar 1997 15:19:19 GMT",
"version": "v1"
}
] |
2009-10-30
|
[
[
"Dedes",
"A.",
""
],
[
"Tamvakis",
"K.",
""
]
] |
We make a complete analysis of the Yukawa coupling unification in SU(5) extensions of the MSSM in the framework of the radiative symmetry breaking scenario. Both logarithmic and finite threshold corrections of sparticles have been included in the determination of the gauge and Yukawa couplings at M_Z. The effect of the heavy masses of each model in the renormalization group equations is also included. We find that in the minimal SU(5) model b-tau Yukawa unification can be achieved for too large a value of alpha_s. On the other hand the Peccei-Quinn version of the Missing Doublet model, with the effect of the right handed neutrino also included, exhibits b-tau unification in excellent agreement with all low energy experimental data. Unification of all Yukawa couplings is also discussed.
|
2304.07698
|
Zhen-Xing Zhao
|
Zhen-Xing Zhao, Fu-Wei Zhang, Xiao-Hui Hu, Yu-Ji Shi
|
Baryons in the light-front approach: The three-quark picture
|
13 pages; version accepted by PRD
| null |
10.1103/PhysRevD.107.116025
| null |
hep-ph
|
http://creativecommons.org/licenses/by/4.0/
|
In this work, a three-quark picture is constructed using a bottom-up approach
for baryons in light-front quark model. The shape parameters, which
characterize the momentum distribution inside a baryon, are determined with the
help of the pole residue of the baryon. The relation between the three-quark
picture and the diquark picture is clarified. When building the model, we find
that Lorentz boost plays a crucial role, and the bottom-up modeling approach
can be generalized to multiquark states. Based on this, a unified theoretical
framework for describing multiquark states may be established. As a by-product
of model construction, we can easily obtain a newly improved definition of
baryon interpolating current. The hadron interpolating currents are the
starting point of Lattice QCD and QCD sum rules, and therefore are of great
importance.
|
[
{
"created": "Sun, 16 Apr 2023 05:23:58 GMT",
"version": "v1"
},
{
"created": "Sat, 2 Dec 2023 05:30:44 GMT",
"version": "v2"
}
] |
2023-12-05
|
[
[
"Zhao",
"Zhen-Xing",
""
],
[
"Zhang",
"Fu-Wei",
""
],
[
"Hu",
"Xiao-Hui",
""
],
[
"Shi",
"Yu-Ji",
""
]
] |
In this work, a three-quark picture is constructed using a bottom-up approach for baryons in light-front quark model. The shape parameters, which characterize the momentum distribution inside a baryon, are determined with the help of the pole residue of the baryon. The relation between the three-quark picture and the diquark picture is clarified. When building the model, we find that Lorentz boost plays a crucial role, and the bottom-up modeling approach can be generalized to multiquark states. Based on this, a unified theoretical framework for describing multiquark states may be established. As a by-product of model construction, we can easily obtain a newly improved definition of baryon interpolating current. The hadron interpolating currents are the starting point of Lattice QCD and QCD sum rules, and therefore are of great importance.
|
1008.5013
|
Kazunori Nakayama
|
Masahiro Kawasaki, Naoya Kitajima, Kazunori Nakayama
|
Inflation from a Supersymmetric Axion Model
|
5 pages; to appear in PRD
|
Phys.Rev.D82:123531,2010
|
10.1103/PhysRevD.82.123531
|
ICRR-Report-573, IPMU 10-0148, KEK-TH-1395
|
hep-ph astro-ph.CO
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We show that a supersymmetric axion model naturally induces a hybrid
inflation with the waterfall field identified as a Peccei-Quinn scalar. The
Peccei-Quinn scale is predicted to be around 10^{15}GeV for reproducing the
large-scale density perturbation of the Universe. After the built-in late-time
entropy-production process, the axion becomes a dark matter candidate. Several
cosmological implications are discussed.
|
[
{
"created": "Mon, 30 Aug 2010 06:31:58 GMT",
"version": "v1"
},
{
"created": "Fri, 10 Dec 2010 02:07:00 GMT",
"version": "v2"
}
] |
2011-02-02
|
[
[
"Kawasaki",
"Masahiro",
""
],
[
"Kitajima",
"Naoya",
""
],
[
"Nakayama",
"Kazunori",
""
]
] |
We show that a supersymmetric axion model naturally induces a hybrid inflation with the waterfall field identified as a Peccei-Quinn scalar. The Peccei-Quinn scale is predicted to be around 10^{15}GeV for reproducing the large-scale density perturbation of the Universe. After the built-in late-time entropy-production process, the axion becomes a dark matter candidate. Several cosmological implications are discussed.
|
2005.00535
|
Zhi-Gang Wang
|
Zhi-Gang Wang, Hui-Juan Wang, Qi Xin
|
The hadronic coupling constants of the lowest hidden-charm pentaquark
state with the QCD sum rules in rigorous quark-hadron duality
|
27 pages, 9 figures
|
Chin. Phys. C45 (2021) 063104
|
10.1088/1674-1137/abf13b
| null |
hep-ph
|
http://creativecommons.org/licenses/by/4.0/
|
In this article, we illustrate how to calculate the hadronic coupling
constants of the pentaquark states with the QCD sum rules based on rigorous
quark-hadron quality, then study the hadronic coupling constants of the lowest
diquark-diquark-antiquark type hidden-charm pentaquark state with the
spin-parity $J^P={\frac{1}{2}}^-$ in details, and calculate the partial decay
widths. The total width $\Gamma(P_c)=14.32\pm3.31\,\rm{MeV}$ is compatible with
the experimental value $\Gamma_{P_c(4312)} = 9.8\pm2.7^{+ 3.7}_{- 4.5} \mbox{
MeV}$ from the LHCb collaboration, and favors assigning the $P_c(4312)$ to be
the $[ud][uc]\bar{c}$ pentaquark state with the $J^P={\frac{1}{2}}^-$. The
hadronic coupling constants have the relation $|G_{PD^-\Sigma_c^{++}}|=
\sqrt{2}|G_{P\bar{D}^0\Sigma_c^+}|\gg |G_{P\bar{D}^0\Lambda_c^+}|$, and favor
the hadronic dressing mechanism. The $P_c(4312)$ maybe have a
diquark-diquark-antiquark type pentaquark core with the typical size of the
$qqq$-type baryon states, the strong couplings to the meson-baryon pairs
$\bar{D}\Sigma_c$ lead to some pentaquark molecule components, and the
$P_c(4312)$ maybe spend a rather large time as the $\bar{D}\Sigma_c$ molecular
state.
|
[
{
"created": "Fri, 1 May 2020 02:30:36 GMT",
"version": "v1"
},
{
"created": "Wed, 2 Sep 2020 02:48:45 GMT",
"version": "v2"
},
{
"created": "Tue, 1 Dec 2020 01:59:41 GMT",
"version": "v3"
},
{
"created": "Tue, 9 Mar 2021 13:12:45 GMT",
"version": "v4"
}
] |
2021-04-19
|
[
[
"Wang",
"Zhi-Gang",
""
],
[
"Wang",
"Hui-Juan",
""
],
[
"Xin",
"Qi",
""
]
] |
In this article, we illustrate how to calculate the hadronic coupling constants of the pentaquark states with the QCD sum rules based on rigorous quark-hadron quality, then study the hadronic coupling constants of the lowest diquark-diquark-antiquark type hidden-charm pentaquark state with the spin-parity $J^P={\frac{1}{2}}^-$ in details, and calculate the partial decay widths. The total width $\Gamma(P_c)=14.32\pm3.31\,\rm{MeV}$ is compatible with the experimental value $\Gamma_{P_c(4312)} = 9.8\pm2.7^{+ 3.7}_{- 4.5} \mbox{ MeV}$ from the LHCb collaboration, and favors assigning the $P_c(4312)$ to be the $[ud][uc]\bar{c}$ pentaquark state with the $J^P={\frac{1}{2}}^-$. The hadronic coupling constants have the relation $|G_{PD^-\Sigma_c^{++}}|= \sqrt{2}|G_{P\bar{D}^0\Sigma_c^+}|\gg |G_{P\bar{D}^0\Lambda_c^+}|$, and favor the hadronic dressing mechanism. The $P_c(4312)$ maybe have a diquark-diquark-antiquark type pentaquark core with the typical size of the $qqq$-type baryon states, the strong couplings to the meson-baryon pairs $\bar{D}\Sigma_c$ lead to some pentaquark molecule components, and the $P_c(4312)$ maybe spend a rather large time as the $\bar{D}\Sigma_c$ molecular state.
|
2112.05392
|
Felix Yu
|
Bogdan A. Dobrescu, Felix Yu
|
Dijet and electroweak limits on a $Z'$ boson coupled to quarks
|
33 pages, 4 figures; v2 updated figures with 13.6 TeV cross sections,
matches published version
|
Phys.Rev.D 109 (2024) 3, 035004
|
10.1103/PhysRevD.109.035004
|
MITP-17-048
|
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
An insightful way of presenting the LHC limits on dijet resonances is the
coupling-mass plot for a $Z'$ boson that has flavor-independent quark
interactions. This also illustrates the comparison of low-mass LHC sensitivity
with constraints on the flavor-independent $Z'$ boson from electroweak and
quarkonium measurements. To derive these constraints, we compute the $Z'$
mixing with the $Z$, the photon, and the $\Upsilon$ meson, emphasizing the
logarithmic dependence on the masses of the new electroweak-charged fermions
(``anomalons") required to cancel the gauge anomalies. We update the
coupling-mass plot, extending it for $Z'$ masses from 5 GeV to 5 TeV.
|
[
{
"created": "Fri, 10 Dec 2021 08:56:12 GMT",
"version": "v1"
},
{
"created": "Mon, 29 Apr 2024 05:45:52 GMT",
"version": "v2"
}
] |
2024-04-30
|
[
[
"Dobrescu",
"Bogdan A.",
""
],
[
"Yu",
"Felix",
""
]
] |
An insightful way of presenting the LHC limits on dijet resonances is the coupling-mass plot for a $Z'$ boson that has flavor-independent quark interactions. This also illustrates the comparison of low-mass LHC sensitivity with constraints on the flavor-independent $Z'$ boson from electroweak and quarkonium measurements. To derive these constraints, we compute the $Z'$ mixing with the $Z$, the photon, and the $\Upsilon$ meson, emphasizing the logarithmic dependence on the masses of the new electroweak-charged fermions (``anomalons") required to cancel the gauge anomalies. We update the coupling-mass plot, extending it for $Z'$ masses from 5 GeV to 5 TeV.
|
2202.01789
|
Juan Carlos Vasquez Carmona
|
Gang Li, Michael J. Ramsey-Musolf and Juan Carlos Vasquez
|
Unravelling the left-right mixing using $0\nu \beta\beta$ decay and
collider probes
|
12 pages, 6 figures, 5 tables. Version accepted in the Physical
Review D
| null |
10.1103/PhysRevD.105.115021
|
ACFI-T22-03
|
hep-ph hep-ex
|
http://creativecommons.org/licenses/by/4.0/
|
In the context of the minimal left-right symmetric model, we study the
interplay between current and future neutrinoless double beta
($0\nu\beta\beta$) decay experiments, long-lived particle searches at the LHC
main detectors ATLAS/CMS, and the proposed far detector MATHUSLA. The heavy
Majorana neutrino can be produced in association with an electron from the
decay of $W$ boson for a non-zero left-right mixing and subsequently decays
into another electron with the same charge and jets. Owing to the suppression
of large right-handed charged gauge boson $W_R$ mass, the heavy neutrinos could
be long-lived. We show that long-lived particle (LLP) searches for heavy
Majorana neutrinos in the same-sign dilepton channel at the LHC can be used to
extend $W_R$ boson mass reach relative to the reach of the Keung-Senjanovic
(KS) process. Finally, we show that sensitivities of LLP searches at the
high-luminosity LHC with main detectors ATLAS/CMS are competitive with those of
future $0\nu\beta\beta$ decay searches.
|
[
{
"created": "Thu, 3 Feb 2022 19:00:01 GMT",
"version": "v1"
},
{
"created": "Tue, 31 May 2022 16:40:48 GMT",
"version": "v2"
}
] |
2022-06-29
|
[
[
"Li",
"Gang",
""
],
[
"Ramsey-Musolf",
"Michael J.",
""
],
[
"Vasquez",
"Juan Carlos",
""
]
] |
In the context of the minimal left-right symmetric model, we study the interplay between current and future neutrinoless double beta ($0\nu\beta\beta$) decay experiments, long-lived particle searches at the LHC main detectors ATLAS/CMS, and the proposed far detector MATHUSLA. The heavy Majorana neutrino can be produced in association with an electron from the decay of $W$ boson for a non-zero left-right mixing and subsequently decays into another electron with the same charge and jets. Owing to the suppression of large right-handed charged gauge boson $W_R$ mass, the heavy neutrinos could be long-lived. We show that long-lived particle (LLP) searches for heavy Majorana neutrinos in the same-sign dilepton channel at the LHC can be used to extend $W_R$ boson mass reach relative to the reach of the Keung-Senjanovic (KS) process. Finally, we show that sensitivities of LLP searches at the high-luminosity LHC with main detectors ATLAS/CMS are competitive with those of future $0\nu\beta\beta$ decay searches.
|
hep-ph/0008064
|
Vadim Guzey
|
C. Boros, V. Guzey (Adelaide U.), M. Strikman (Penn State U.), and
A.W. Thomas (Adelaide U.)
|
Role of the Delta (1232) in DIS on polarized $^3$He and extraction of
the neutron spin structure function $g_{1}^{n}(x,Q^2)$
|
23 pages, 6 figures, revtex
|
Phys.Rev.D64:014025,2001
|
10.1103/PhysRevD.64.014025
|
ADP-00-30/T413
|
hep-ph hep-ex nucl-th
| null |
We consider the effect of the transitions $n \to \Delta^{0}$ and $p \to
\Delta^{+}$ in deep inelastic scattering on polarized $^3$He on the extraction
of the neutron spin structure function $g_{1}^{n}(x,Q^2)$. Making the natural
assumption that these transitions are the dominant non-nucleonic contributions
to the renormalization of the axial vector coupling constant in the A=3 system,
we find that the effect of $\Delta$ increases $g_{1}^{n}(x,Q^2)$ by $10 \div
40$% in the range $0.05 \le x \le 0.6$, where our considerations are applicable
and most of the data for $g_{1}^{n}(x,Q^2)$ exist.
|
[
{
"created": "Tue, 8 Aug 2000 02:21:19 GMT",
"version": "v1"
}
] |
2010-02-17
|
[
[
"Boros",
"C.",
"",
"Adelaide U."
],
[
"Guzey",
"V.",
"",
"Adelaide U."
],
[
"Strikman",
"M.",
"",
"Penn State U."
],
[
"Thomas",
"A. W.",
"",
"Adelaide U."
]
] |
We consider the effect of the transitions $n \to \Delta^{0}$ and $p \to \Delta^{+}$ in deep inelastic scattering on polarized $^3$He on the extraction of the neutron spin structure function $g_{1}^{n}(x,Q^2)$. Making the natural assumption that these transitions are the dominant non-nucleonic contributions to the renormalization of the axial vector coupling constant in the A=3 system, we find that the effect of $\Delta$ increases $g_{1}^{n}(x,Q^2)$ by $10 \div 40$% in the range $0.05 \le x \le 0.6$, where our considerations are applicable and most of the data for $g_{1}^{n}(x,Q^2)$ exist.
|
1508.02530
|
Tomas Kasemets
|
Tomas Kasemets
|
Polarization in double parton scattering
|
7 pages, 4 figures, To appear in the proceedings of DIS 2015
| null | null | null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We briefly discuss the status of double parton scattering (DPS) on both
theoretical and experimental sides and summarize the state of the naive DPS
model, where the scatterers are taken completely independent. We then elaborate
on some of the effects which are neglected in such an approach, and often
ignored in phenomenological studies, with focus on polarization - which arises
from the correlation between the spin of two partons inside a proton.
Polarization is of particular interest, thanks to its direct and calculable
connections to the distribution of particles in the final state. Although the
physics described is different, there are strong similarities between
polarization in DPS and in single partons scattering with measured transverse
momentum, and several of the techniques and results from studies of transverse
momentum dependent parton distributions can be translated into the setting of
double parton scattering.
|
[
{
"created": "Tue, 11 Aug 2015 09:24:25 GMT",
"version": "v1"
}
] |
2015-08-12
|
[
[
"Kasemets",
"Tomas",
""
]
] |
We briefly discuss the status of double parton scattering (DPS) on both theoretical and experimental sides and summarize the state of the naive DPS model, where the scatterers are taken completely independent. We then elaborate on some of the effects which are neglected in such an approach, and often ignored in phenomenological studies, with focus on polarization - which arises from the correlation between the spin of two partons inside a proton. Polarization is of particular interest, thanks to its direct and calculable connections to the distribution of particles in the final state. Although the physics described is different, there are strong similarities between polarization in DPS and in single partons scattering with measured transverse momentum, and several of the techniques and results from studies of transverse momentum dependent parton distributions can be translated into the setting of double parton scattering.
|
hep-ph/9311303
| null |
A. Ballestrero and E. Maina
|
Five Jet Production with Heavy Quarks at $e^+ e^-$ Colliders
|
14 pages + 2 pages of Feynman diagrams appended as 2 separate files
after \end{document}(with Feynman.tex) + 2 Figs submitted in uuencoded form,
LaTex, DFTT 68/93
|
Phys.Lett.B323:53-64,1994
|
10.1016/0370-2693(94)00028-X
| null |
hep-ph
| null |
Heavy quark production in five jet events at $e^+e^-$ colliders is studied at
tree level using helicity amplitudes. Total production rates for $2b3j$ and
$4bj$ are given and compared with the corresponding results for massless
quarks. The process $e^+e^-\rightarrow q\bar q gg\gamma$ which is the dominant
contribution to $4j\gamma$ production is briefly discussed.
|
[
{
"created": "Wed, 17 Nov 1993 13:35:13 GMT",
"version": "v1"
}
] |
2010-11-01
|
[
[
"Ballestrero",
"A.",
""
],
[
"Maina",
"E.",
""
]
] |
Heavy quark production in five jet events at $e^+e^-$ colliders is studied at tree level using helicity amplitudes. Total production rates for $2b3j$ and $4bj$ are given and compared with the corresponding results for massless quarks. The process $e^+e^-\rightarrow q\bar q gg\gamma$ which is the dominant contribution to $4j\gamma$ production is briefly discussed.
|
1806.05617
|
Ivan Vitev
|
Ivan Vitev
|
Inverting the mass hierarchy of jet quenching effects with prompt
$b$-jet substructure
|
Proceedings of WWND2018, 8 pages, 8 figures
| null |
10.1088/1742-6596/1070/1/012020
| null |
hep-ph nucl-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
In these proceedings, we discuss the role of heavy quark mass on the
formation of parton showers. Mass effects are not well understood when parton
branching occurs in nuclear matter, such as the quark-gluon plasma. Recently, a
theoretically consistent picture of open heavy flavor production in ultra
relativistic nuclear collisions has begun to emerge based on effective theories
of QCD, such as soft collinear effective theory with Glauber gluons. We show
that implementation of in-medium splitting processes containing heavy quarks
into next-to-leading order calculations of heavy flavor production leads to
larger cross section suppression when compared to traditional energy loss
phenomenology. To better constrain the important mass dependence of in-medium
splitting functions, we propose a new measurement in relativistic heavy ion
collisions, based on a two-prong structure inside a reconstructed heavy flavor
jet. In the region of jet transverse momenta where parton mass effects are
leading, we predict a unique reversal of the mass hierarchy of jet quenching
effects in heavy ion relative to proton collisions. We find that the momentum
sharing distribution of prompt $b$-tagged jets is more strongly modified in
comparison to the one for light jets. The work summarized here opens new
directions of research on the substructure of heavy flavor jets.
|
[
{
"created": "Thu, 14 Jun 2018 15:47:31 GMT",
"version": "v1"
}
] |
2022-01-26
|
[
[
"Vitev",
"Ivan",
""
]
] |
In these proceedings, we discuss the role of heavy quark mass on the formation of parton showers. Mass effects are not well understood when parton branching occurs in nuclear matter, such as the quark-gluon plasma. Recently, a theoretically consistent picture of open heavy flavor production in ultra relativistic nuclear collisions has begun to emerge based on effective theories of QCD, such as soft collinear effective theory with Glauber gluons. We show that implementation of in-medium splitting processes containing heavy quarks into next-to-leading order calculations of heavy flavor production leads to larger cross section suppression when compared to traditional energy loss phenomenology. To better constrain the important mass dependence of in-medium splitting functions, we propose a new measurement in relativistic heavy ion collisions, based on a two-prong structure inside a reconstructed heavy flavor jet. In the region of jet transverse momenta where parton mass effects are leading, we predict a unique reversal of the mass hierarchy of jet quenching effects in heavy ion relative to proton collisions. We find that the momentum sharing distribution of prompt $b$-tagged jets is more strongly modified in comparison to the one for light jets. The work summarized here opens new directions of research on the substructure of heavy flavor jets.
|
2008.04633
|
Yufeng Li
|
Jie Cheng, Yu-Feng Li, Liang-Jian Wen, Shun Zhou
|
Neutral-current background induced by atmospheric neutrinos at large
liquid-scintillator detectors: I. model predictions
|
30 pages, 10 figures, more discussions, version to appear in PRD
|
Phys. Rev. D 103, 053001 (2021)
|
10.1103/PhysRevD.103.053001
| null |
hep-ph astro-ph.HE hep-ex nucl-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
The experimental searches for diffuse supernova neutrino background and
proton decay in next-generation large liquid-scintillator (LS) detectors are
competitive with and complementary to those in the water-Cherenkov detectors.
In this paper, we carry out a systematic study of the dominant background
induced by atmospheric neutrinos via their neutral-current (NC) interactions
with the $^{12}{\rm C}$ nuclei in the LS detectors. The atmospheric neutrino
fluxes at the location of Jiangmen Underground Neutrino Observatory (JUNO) are
used, as the JUNO detector is obviously a suitable representative for future LS
detectors. Then, we implement the sophisticated generators \texttt{GENIE} and
\texttt{NuWro} to simulate the neutrino interactions with the carbon nuclei,
and the package \texttt{TALYS} to deal with the deexcitations of final-state
nuclei. Finally, the event rates for the production of additional nucleons,
$\gamma$'s, $\alpha$'s, pions and kaons are obtained and categorized, and the
systematic uncertainty of the NC background represented by a variety of
data-driven nuclear models is estimated. The implications of the NC background
from atmospheric neutrinos for the detection of diffuse supernova neutrino
background and proton decay are also discussed.
|
[
{
"created": "Tue, 11 Aug 2020 11:23:19 GMT",
"version": "v1"
},
{
"created": "Fri, 5 Feb 2021 04:53:01 GMT",
"version": "v2"
}
] |
2021-03-17
|
[
[
"Cheng",
"Jie",
""
],
[
"Li",
"Yu-Feng",
""
],
[
"Wen",
"Liang-Jian",
""
],
[
"Zhou",
"Shun",
""
]
] |
The experimental searches for diffuse supernova neutrino background and proton decay in next-generation large liquid-scintillator (LS) detectors are competitive with and complementary to those in the water-Cherenkov detectors. In this paper, we carry out a systematic study of the dominant background induced by atmospheric neutrinos via their neutral-current (NC) interactions with the $^{12}{\rm C}$ nuclei in the LS detectors. The atmospheric neutrino fluxes at the location of Jiangmen Underground Neutrino Observatory (JUNO) are used, as the JUNO detector is obviously a suitable representative for future LS detectors. Then, we implement the sophisticated generators \texttt{GENIE} and \texttt{NuWro} to simulate the neutrino interactions with the carbon nuclei, and the package \texttt{TALYS} to deal with the deexcitations of final-state nuclei. Finally, the event rates for the production of additional nucleons, $\gamma$'s, $\alpha$'s, pions and kaons are obtained and categorized, and the systematic uncertainty of the NC background represented by a variety of data-driven nuclear models is estimated. The implications of the NC background from atmospheric neutrinos for the detection of diffuse supernova neutrino background and proton decay are also discussed.
|
hep-ph/0307093
|
Ezequiel Alvarez
|
Ezequiel Alvarez and Jose Bernabeu Alberola
|
Correlated neutral B meson decays into CP eigenstates
|
9 pages, no figures. Minor changes to coincide with published PLB
version
|
Phys.Lett.B579:79-85,2004
|
10.1016/j.physletb.2003.10.114
| null |
hep-ph
| null |
In the two correlated $B$ meson decay experiment we propose to measure
intensities relating CP eigenstate ($J/\psi K_{S,L}$) decays on $both$ sides,
which will be measurable in future upgrades of KEK and PEP. As a CP-forbidden
transition, we obtain $I(J/\psi K_S, J/\psi K_S, \Delta t) \sim \sin ^2
(2\beta)$. We calculate in a model independent way all the possible intensities
relating final CP and flavour eigenstate decays. Under CPT-invariance, the
asymmetries for processes related by CP$\Delta t$ vanish for $\Delta \Gamma =0$
and measure $\Delta \Gamma$ linearly. We notice the impossibility to isolate
the sign of $\cos (2\bet a)$ without an independent knowledge of the sign of
$\Delta \Gamma$. This exhaustion of the possible Golden Plate and flavour
decays provides new observables which may throw light in our present
understanding of CKM physics.
|
[
{
"created": "Mon, 7 Jul 2003 16:31:54 GMT",
"version": "v1"
},
{
"created": "Mon, 12 Apr 2004 11:18:18 GMT",
"version": "v2"
}
] |
2014-11-17
|
[
[
"Alvarez",
"Ezequiel",
""
],
[
"Alberola",
"Jose Bernabeu",
""
]
] |
In the two correlated $B$ meson decay experiment we propose to measure intensities relating CP eigenstate ($J/\psi K_{S,L}$) decays on $both$ sides, which will be measurable in future upgrades of KEK and PEP. As a CP-forbidden transition, we obtain $I(J/\psi K_S, J/\psi K_S, \Delta t) \sim \sin ^2 (2\beta)$. We calculate in a model independent way all the possible intensities relating final CP and flavour eigenstate decays. Under CPT-invariance, the asymmetries for processes related by CP$\Delta t$ vanish for $\Delta \Gamma =0$ and measure $\Delta \Gamma$ linearly. We notice the impossibility to isolate the sign of $\cos (2\bet a)$ without an independent knowledge of the sign of $\Delta \Gamma$. This exhaustion of the possible Golden Plate and flavour decays provides new observables which may throw light in our present understanding of CKM physics.
|
0912.0538
|
Viacheslav Lee
|
M. Antonello, V. Caracciolo, G. Christodoulou, J. Dobson, E. Frank, T.
Golan, V. Lee, S. Mania, P. Przewlocki, B. Rossi, D. Stefan, R. Sulej, T.
Szeglowski, R. Tacik, T. Wachala
|
Study of Pion Production in \nu_\mu CC Interactions on O16 Using
Different MC Generators
| null |
Acta Phys.Polon.B40:2519-2535,2009
| null | null |
hep-ph hep-ex
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
In this report we present simulated event numbers, for various MC generators,
for pion production in $\nu_{\mu}$ CC reactions on $\nucl{16}{O}$. For the
simulation we used four different neutrino interaction generators: GENIE,
FLUKA, NEUT, and NuWro, as proposed during the 45th Karpacz Winter School on
neutrino interactions. First we give a brief outline of the theoretical models
relevant to pion production. We then present results, in the form of tables
showing the occupancy of primary and final state pion topologies, for all the
generated samples. Finally we compare the results from the different generators
and draw conclusions about the similarities and differences. For some of the
generators we explore the effect of varying the axial mass parameter or the use
of a different nuclear model.
|
[
{
"created": "Wed, 2 Dec 2009 21:59:00 GMT",
"version": "v1"
}
] |
2010-05-12
|
[
[
"Antonello",
"M.",
""
],
[
"Caracciolo",
"V.",
""
],
[
"Christodoulou",
"G.",
""
],
[
"Dobson",
"J.",
""
],
[
"Frank",
"E.",
""
],
[
"Golan",
"T.",
""
],
[
"Lee",
"V.",
""
],
[
"Mania",
"S.",
""
],
[
"Przewlocki",
"P.",
""
],
[
"Rossi",
"B.",
""
],
[
"Stefan",
"D.",
""
],
[
"Sulej",
"R.",
""
],
[
"Szeglowski",
"T.",
""
],
[
"Tacik",
"R.",
""
],
[
"Wachala",
"T.",
""
]
] |
In this report we present simulated event numbers, for various MC generators, for pion production in $\nu_{\mu}$ CC reactions on $\nucl{16}{O}$. For the simulation we used four different neutrino interaction generators: GENIE, FLUKA, NEUT, and NuWro, as proposed during the 45th Karpacz Winter School on neutrino interactions. First we give a brief outline of the theoretical models relevant to pion production. We then present results, in the form of tables showing the occupancy of primary and final state pion topologies, for all the generated samples. Finally we compare the results from the different generators and draw conclusions about the similarities and differences. For some of the generators we explore the effect of varying the axial mass parameter or the use of a different nuclear model.
|
hep-ph/0601007
|
Bogdan Mihaila
|
Bogdan Mihaila, Krastan B. Blagoev, and Fred Cooper
|
Phases of a fermionic model with chiral condensates and Cooper pairs in
1+1 dimensions
| null |
Phys.Rev.D73:016005,2006
|
10.1103/PhysRevD.73.016005
|
LA-UR-05-8819
|
hep-ph
| null |
We study the phase structure of a 4-fermi model with three bare coupling
constants, which potentially has three types of bound states. This model is a
generalization of the model discussed previously by A. Chodos et al. [Phys.
Rev. D 61, 045011 (2000)], which contained both chiral condensates and Cooper
pairs. For this generalization we find that there are two independent
renormalized coupling constants which determine the phase structure at finite
density and temperature. We find that the vacuum can be in one of three
distinct phases depending on the value of these two renormalized coupling
constants.
|
[
{
"created": "Sun, 1 Jan 2006 18:38:56 GMT",
"version": "v1"
}
] |
2008-11-26
|
[
[
"Mihaila",
"Bogdan",
""
],
[
"Blagoev",
"Krastan B.",
""
],
[
"Cooper",
"Fred",
""
]
] |
We study the phase structure of a 4-fermi model with three bare coupling constants, which potentially has three types of bound states. This model is a generalization of the model discussed previously by A. Chodos et al. [Phys. Rev. D 61, 045011 (2000)], which contained both chiral condensates and Cooper pairs. For this generalization we find that there are two independent renormalized coupling constants which determine the phase structure at finite density and temperature. We find that the vacuum can be in one of three distinct phases depending on the value of these two renormalized coupling constants.
|
1210.6507
|
Manuel Drees
|
Manuel Drees (Bonn)
|
A Supersymmetric Explanation of the Excess of Higgs--Like Events at the
LHC and at LEP
|
17 pages PDFLaTeX with 10 PDF files. Added a reference and removed a
misleading statement. Final version: added some remarks on flavor
constraints; version to appear in PRD
| null |
10.1103/PhysRevD.86.115018
| null |
hep-ph hep-ex
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
The LHC collaborations have recently announced evidence for the production of
a "Higgs--like" boson with mass near 125 GeV. The properties of the new
particle are consistent (within still quite large uncertainties) with those of
the Higgs boson predicted in the Standard Model (SM). This discovery comes
nearly ten years after a combined analysis of the four LEP experiments showed a
mild excess of Higgs--like events with a mass near 98 GeV. I show that both
groups of events can be explained simultaneously in the minimal supersymmetric
extension of the SM, in terms of the production and decay of the two neutral
CP--even Higgs bosons predicted by this model, and explore the phenomenological
consequences of this explanation.
|
[
{
"created": "Wed, 24 Oct 2012 12:30:14 GMT",
"version": "v1"
},
{
"created": "Wed, 31 Oct 2012 12:51:08 GMT",
"version": "v2"
},
{
"created": "Thu, 29 Nov 2012 07:51:57 GMT",
"version": "v3"
}
] |
2013-05-30
|
[
[
"Drees",
"Manuel",
"",
"Bonn"
]
] |
The LHC collaborations have recently announced evidence for the production of a "Higgs--like" boson with mass near 125 GeV. The properties of the new particle are consistent (within still quite large uncertainties) with those of the Higgs boson predicted in the Standard Model (SM). This discovery comes nearly ten years after a combined analysis of the four LEP experiments showed a mild excess of Higgs--like events with a mass near 98 GeV. I show that both groups of events can be explained simultaneously in the minimal supersymmetric extension of the SM, in terms of the production and decay of the two neutral CP--even Higgs bosons predicted by this model, and explore the phenomenological consequences of this explanation.
|
0707.2323
|
Piotr Chankowski
|
Piotr H. Chankowski, Jakub Wagner
|
Violation of the Appelquist-Carazzone decoupling in non-SUSY GUT
|
17 pages, no figures
|
Phys.Rev.D77:025033,2008
|
10.1103/PhysRevD.77.025033
|
IFT-6/2007
|
hep-ph
| null |
We point out that in non supersymmetric GUTs, in which the SU(5) gauge
symmetry is broken down to the Standard Model gauge group by a $\mathbf{24}$
Higgs multiplet the Appelquist-Carazzone decoupling is violated. This is
because the $SU(2)_L$ Higgs triplet contained in the $\mathbf{24}$ acquires a
dimensionfull coupling to the $SU(2)_L$ Higgs doublets which is proportional to
the GUT breaking vacuum expectation value (VEV) $V$. As a result, at one loop
heavy gauge and Higgs fields contribution to tadpoles generate a VEV of the
triplet which is not suppressed for $V\to\infty$ and violates the custodial
symmetry.
|
[
{
"created": "Mon, 16 Jul 2007 14:08:00 GMT",
"version": "v1"
}
] |
2008-11-26
|
[
[
"Chankowski",
"Piotr H.",
""
],
[
"Wagner",
"Jakub",
""
]
] |
We point out that in non supersymmetric GUTs, in which the SU(5) gauge symmetry is broken down to the Standard Model gauge group by a $\mathbf{24}$ Higgs multiplet the Appelquist-Carazzone decoupling is violated. This is because the $SU(2)_L$ Higgs triplet contained in the $\mathbf{24}$ acquires a dimensionfull coupling to the $SU(2)_L$ Higgs doublets which is proportional to the GUT breaking vacuum expectation value (VEV) $V$. As a result, at one loop heavy gauge and Higgs fields contribution to tadpoles generate a VEV of the triplet which is not suppressed for $V\to\infty$ and violates the custodial symmetry.
|
1409.3989
|
Andrea Ferroglia
|
Andrea Ferroglia, Simone Marzani, Ben D. Pecjak, Li Lin Yang
|
Boosted Top Quark Pair Production in Soft Collinear Effective Theory
|
6 pages. Proceedings of the Second Annual Conference on Large Hadron
Collider Physics (LHCP 2014), Columbia University, New York, June 2-7, 2014
| null | null | null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We review a Soft Collinear Effective Theory approach to the study of
factorization and resummation of QCD effects in top-quark pair production. In
particular, we consider differential cross sections such as the top-quark pair
invariant mass distribution and the top-quark transverse momentum and rapidity
distributions. Furthermore, we focus our attention on the large invariant mass
and large transverse momentum kinematic regions, characteristic of boosted top
quarks. We discuss the factorization of the differential cross section in the
double soft gluon emission and small top-quark mass limit, both in Pair
Invariant Mass (PIM) and One Particle Inclusive (1PI) kinematics. The
factorization formulas can be employed in order to implement the simultaneous
resummation of soft emission and small mass effects up to
next-to-next-to-leading logarithmic accuracy. The results are also used to
construct improved next-to-next-to-leading order approximations for the
differential cross sections.
|
[
{
"created": "Sat, 13 Sep 2014 20:43:19 GMT",
"version": "v1"
}
] |
2014-09-16
|
[
[
"Ferroglia",
"Andrea",
""
],
[
"Marzani",
"Simone",
""
],
[
"Pecjak",
"Ben D.",
""
],
[
"Yang",
"Li Lin",
""
]
] |
We review a Soft Collinear Effective Theory approach to the study of factorization and resummation of QCD effects in top-quark pair production. In particular, we consider differential cross sections such as the top-quark pair invariant mass distribution and the top-quark transverse momentum and rapidity distributions. Furthermore, we focus our attention on the large invariant mass and large transverse momentum kinematic regions, characteristic of boosted top quarks. We discuss the factorization of the differential cross section in the double soft gluon emission and small top-quark mass limit, both in Pair Invariant Mass (PIM) and One Particle Inclusive (1PI) kinematics. The factorization formulas can be employed in order to implement the simultaneous resummation of soft emission and small mass effects up to next-to-next-to-leading logarithmic accuracy. The results are also used to construct improved next-to-next-to-leading order approximations for the differential cross sections.
|
1104.4162
|
Peter Levai
|
Peter Levai (MTA KFKI RMKI, Budapest, Hungary)
|
Jet energy loss in heavy ion collisions from RHIC to LHC energies
|
8 pages, 4 figures, Proceedings of ICPAQGP'2010 Conference, Goa,
India
|
Nucl.Phys.A862-863:146-152,2011
|
10.1016/j.nuclphysa.2011.05.033
| null |
hep-ph nucl-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
The suppression of hadron production originated from the induced jet energy
loss is one of the most accepted and well understood phenomena in heavy ion
collisions, which indicates the formation of color deconfined matter consists
of quarks, antiquarks and gluons. This phenomena has been seen at RHIC energies
and now the first LHC results display a very similar effect. In fact, the
suppression is so close to each other at 200 AGeV and 2.76 ATeV, that it is
interesting to investigate if such a suppression pattern can exist at all. We
use the Gyulassy-Levai-Vitev description of induced jet energy loss combined
with different nuclear shadowing functions and describe the experimental data.
We claim that a consistent picture can be obtained for the produced hot matter
with a weak nuclear shadowing. The interplay between nuclear shadowing and jet
energy loss playes a crucial role in the understanding of the experimental
data.
|
[
{
"created": "Thu, 21 Apr 2011 03:27:11 GMT",
"version": "v1"
}
] |
2011-07-26
|
[
[
"Levai",
"Peter",
"",
"MTA KFKI RMKI, Budapest, Hungary"
]
] |
The suppression of hadron production originated from the induced jet energy loss is one of the most accepted and well understood phenomena in heavy ion collisions, which indicates the formation of color deconfined matter consists of quarks, antiquarks and gluons. This phenomena has been seen at RHIC energies and now the first LHC results display a very similar effect. In fact, the suppression is so close to each other at 200 AGeV and 2.76 ATeV, that it is interesting to investigate if such a suppression pattern can exist at all. We use the Gyulassy-Levai-Vitev description of induced jet energy loss combined with different nuclear shadowing functions and describe the experimental data. We claim that a consistent picture can be obtained for the produced hot matter with a weak nuclear shadowing. The interplay between nuclear shadowing and jet energy loss playes a crucial role in the understanding of the experimental data.
|
2211.08015
|
Faisal Akram
|
Sadia Kanwal, Faisal Akram, Bilal Masud, E.S. Swanson
|
Charmonium spectrum in an unquenched quark model
| null | null |
10.1140/epja/s10050-022-00880-x
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
The effects of virtual light quark pairs on the charmonium spectrum are
studied. Pair creation is modelled with a ``$^{3}P_{0}$" vertex and
intermediate states are summed up to 2S excitations. Quark model parameters are
obtained by fitting to 12 well-known charmonium states, allowing for feedback
between the decaying particle and the induced mass shifts. Both of these
technical steps are new and improve agreement with the experimental spectrum.
In general, the masses receive small shifts once model parameters are refit.
This is true in almost cases except the $\chi_{cJ}(2P)$ multiplet, which
experiences upwards mass shifts of order 150 MeV, has the ordering of the
multiplet rearranged, and pushes the erstwhile $c\bar{c}$ ${2}^3P_1$ state well
above $D^*\bar{D}$ threshold--observations that clarify the nature of the
enigmatic $X(3872)$
|
[
{
"created": "Tue, 15 Nov 2022 09:59:13 GMT",
"version": "v1"
}
] |
2022-11-30
|
[
[
"Kanwal",
"Sadia",
""
],
[
"Akram",
"Faisal",
""
],
[
"Masud",
"Bilal",
""
],
[
"Swanson",
"E. S.",
""
]
] |
The effects of virtual light quark pairs on the charmonium spectrum are studied. Pair creation is modelled with a ``$^{3}P_{0}$" vertex and intermediate states are summed up to 2S excitations. Quark model parameters are obtained by fitting to 12 well-known charmonium states, allowing for feedback between the decaying particle and the induced mass shifts. Both of these technical steps are new and improve agreement with the experimental spectrum. In general, the masses receive small shifts once model parameters are refit. This is true in almost cases except the $\chi_{cJ}(2P)$ multiplet, which experiences upwards mass shifts of order 150 MeV, has the ordering of the multiplet rearranged, and pushes the erstwhile $c\bar{c}$ ${2}^3P_1$ state well above $D^*\bar{D}$ threshold--observations that clarify the nature of the enigmatic $X(3872)$
|
hep-ph/0507279
|
Osamu Seto
|
Nobuchika Okada and Osamu Seto
|
Thermal leptogenesis in brane world cosmology
|
9 pages, final version
|
Phys.Rev. D73 (2006) 063505
|
10.1103/PhysRevD.73.063505
|
KEK-TH-1019
|
hep-ph astro-ph
| null |
The thermal leptogenesis in brane world cosmology is studied. In brane world
cosmology, the expansion law is modified from the four-dimensional standard
cosmological one at high temperature regime in the early universe. As a result,
the well-known upper bound on the lightest light neutrino mass induced by the
condition for the out-of-equilibrium decay of the lightest heavy neutrino,
$\tilde{m}_1 \lesssim 10^{-3}$ eV, can be moderated to be $\tilde{m}_1 \lesssim
10^{-3} {eV} \times (M_1/T_t)^2 $ in the case of $T_t \leq M_1$ with the
lightest heavy neutrino mass ($M_1$) and the ``transition temperature''
($T_t$), at which the modified expansion law in brane world cosmology is
smoothly connecting with the standard one. This implies that the degenerate
mass spectrum of the light neutrinos can be consistent with the thermal
leptogenesis scenario. Furthermore, as recently pointed out, the gravitino
problem in supersymmetric case can be solved if the transition temperature is
low enough $T_t \lesssim 10^{6-7}$ GeV. Therefore, even in the supersymmetric
case, thermal leptogenesis scenario can be successfully realized in brane world
cosmology.
|
[
{
"created": "Mon, 25 Jul 2005 13:35:53 GMT",
"version": "v1"
},
{
"created": "Tue, 28 Mar 2006 13:15:34 GMT",
"version": "v2"
}
] |
2009-11-11
|
[
[
"Okada",
"Nobuchika",
""
],
[
"Seto",
"Osamu",
""
]
] |
The thermal leptogenesis in brane world cosmology is studied. In brane world cosmology, the expansion law is modified from the four-dimensional standard cosmological one at high temperature regime in the early universe. As a result, the well-known upper bound on the lightest light neutrino mass induced by the condition for the out-of-equilibrium decay of the lightest heavy neutrino, $\tilde{m}_1 \lesssim 10^{-3}$ eV, can be moderated to be $\tilde{m}_1 \lesssim 10^{-3} {eV} \times (M_1/T_t)^2 $ in the case of $T_t \leq M_1$ with the lightest heavy neutrino mass ($M_1$) and the ``transition temperature'' ($T_t$), at which the modified expansion law in brane world cosmology is smoothly connecting with the standard one. This implies that the degenerate mass spectrum of the light neutrinos can be consistent with the thermal leptogenesis scenario. Furthermore, as recently pointed out, the gravitino problem in supersymmetric case can be solved if the transition temperature is low enough $T_t \lesssim 10^{6-7}$ GeV. Therefore, even in the supersymmetric case, thermal leptogenesis scenario can be successfully realized in brane world cosmology.
|
1602.09056
|
Hiroaki Kohyama
|
Hiroaki Kohyama
|
The relation between the NJL model and QCD with condensed gluons
|
5 pages, 2 figures
| null | null | null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We try to find the relation between the three-flavor Nambu-Jona-Lasinio model
and QCD based on the hypothesis that the gluon momenta are sharply condensed
around the QCD scale, \mu_g. We find that the effective four- and six-fermion
interactions, G_4 and G_6, should be scaled by G_4 proportional to \mu_g^(-2)
and G_6 proportional to \mu_g^(-5) being consistent with the mass dimension
counting in the obtained effective Lagrangian. We then study the \mu_g
dependence on the phase diagram of the chiral phase transition at finite
temperature and chemical potential and the location of the critical point. We
find that the location of the critical point are sensitively affected by the
value of the introduced gluon energy scale.
|
[
{
"created": "Mon, 29 Feb 2016 17:26:18 GMT",
"version": "v1"
}
] |
2016-03-01
|
[
[
"Kohyama",
"Hiroaki",
""
]
] |
We try to find the relation between the three-flavor Nambu-Jona-Lasinio model and QCD based on the hypothesis that the gluon momenta are sharply condensed around the QCD scale, \mu_g. We find that the effective four- and six-fermion interactions, G_4 and G_6, should be scaled by G_4 proportional to \mu_g^(-2) and G_6 proportional to \mu_g^(-5) being consistent with the mass dimension counting in the obtained effective Lagrangian. We then study the \mu_g dependence on the phase diagram of the chiral phase transition at finite temperature and chemical potential and the location of the critical point. We find that the location of the critical point are sensitively affected by the value of the introduced gluon energy scale.
|
hep-ph/9210240
|
Uri Sarid
|
L.J. Hall and U. Sarid
|
Gravitational Smearing of Minimal Supersymmetric Unification Predictions
|
10 pages total + 1 postscript figure (included), revised: all lines
are TRULY < 70 characters long (try it!); LBL-32905, UCB-PTH-92/37
|
Phys. Rev. Lett. 70, 2673 (1993)
|
10.1103/PhysRevLett.70.2673
| null |
hep-ph
| null |
A short and mean paper.
|
[
{
"created": "Fri, 16 Oct 1992 06:15:54 GMT",
"version": "v1"
},
{
"created": "Fri, 16 Oct 1992 21:48:10 GMT",
"version": "v2"
},
{
"created": "Thu, 22 Oct 1992 04:33:12 GMT",
"version": "v3"
}
] |
2013-11-13
|
[
[
"Hall",
"L. J.",
""
],
[
"Sarid",
"U.",
""
]
] |
A short and mean paper.
|
1508.06841
|
Johanna Daub
|
J. T. Daub, C. Hanhart, B. Kubis
|
A model-independent analysis of final-state interactions in \bar
B_{d/s}^0 --> J/psi pi pi
|
25 pages, 6 figures, version published in JHEP
|
JHEP 1602, 009 (2016)
|
10.1007/JHEP02(2016)009
| null |
hep-ph hep-ex
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Exploiting $B$-meson decays for Standard Model tests and beyond requires a
precise understanding of the strong final-state interactions that can be
provided model-independently by means of dispersion theory. This formalism
allows one to deduce the universal pion-pion final-state interactions from the
accurately known $\pi\pi$ phase shifts and, in the scalar sector, a
coupled-channel treatment with the kaon-antikaon system. In this work an
analysis of the decays $\bar B_d^0 \to J/\psi \pi^+\pi^-$ and $\bar B_s^0 \to
J/\psi \pi^+\pi^-$ is presented. We find very good agreement with the data up
to 1.05 GeV with a number of parameters reduced significantly compared to a
phenomenological analysis. In addition, the phases of the amplitudes are
correct by construction, a crucial feature when it comes to studies of $CP$
violation in heavy-meson decays.
|
[
{
"created": "Thu, 27 Aug 2015 12:59:16 GMT",
"version": "v1"
},
{
"created": "Thu, 28 Jan 2016 19:52:37 GMT",
"version": "v2"
}
] |
2016-02-17
|
[
[
"Daub",
"J. T.",
""
],
[
"Hanhart",
"C.",
""
],
[
"Kubis",
"B.",
""
]
] |
Exploiting $B$-meson decays for Standard Model tests and beyond requires a precise understanding of the strong final-state interactions that can be provided model-independently by means of dispersion theory. This formalism allows one to deduce the universal pion-pion final-state interactions from the accurately known $\pi\pi$ phase shifts and, in the scalar sector, a coupled-channel treatment with the kaon-antikaon system. In this work an analysis of the decays $\bar B_d^0 \to J/\psi \pi^+\pi^-$ and $\bar B_s^0 \to J/\psi \pi^+\pi^-$ is presented. We find very good agreement with the data up to 1.05 GeV with a number of parameters reduced significantly compared to a phenomenological analysis. In addition, the phases of the amplitudes are correct by construction, a crucial feature when it comes to studies of $CP$ violation in heavy-meson decays.
|
0912.0489
|
Victor T. Kim
|
Victor T. Kim
|
Higgs boson decay into heavy quarks and heavy leptons: higher order
corrections
|
5 pages, 2 figures, invited talk at the 3rd Joint International
"Hadron Structure - 2009" (HS'09) Workshop, Tatranska Strba, Slovakia, Aug.
30 - Sept. 3, 2009
|
Nucl.Phys.Proc.Suppl.198:223-227,2010
|
10.1016/j.nuclphysbps.2009.12.045
|
CERN-PH-TH/2009-239
|
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Theoretical predictions for the decay width of Standard Model Higgs boson
into bottom quarks and tau-leptons, in the case when M_H< 2M_W, are briefly
reviewed.
The effects of higher order perturbative QCD (up to alpha_s^4-level) and QED
corrections are considered. The uncertainties of the decay width of Higgs boson
into bb and tau+tau- are discussed.
|
[
{
"created": "Wed, 2 Dec 2009 18:35:07 GMT",
"version": "v1"
}
] |
2010-04-22
|
[
[
"Kim",
"Victor T.",
""
]
] |
Theoretical predictions for the decay width of Standard Model Higgs boson into bottom quarks and tau-leptons, in the case when M_H< 2M_W, are briefly reviewed. The effects of higher order perturbative QCD (up to alpha_s^4-level) and QED corrections are considered. The uncertainties of the decay width of Higgs boson into bb and tau+tau- are discussed.
|
0908.0212
|
Yutaka Hosotani
|
Yutaka Hosotani, Pyungwon Ko, and Minoru Tanaka
|
Stable Higgs Bosons as Cold Dark Matter
|
12 pages, 2 figures
|
Phys.Lett.B680:179-183,2009
|
10.1016/j.physletb.2009.08.050
|
OU-HET 631/2009, KIAS-P09040
|
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
In a class of the gauge-Higgs unification models the 4D neutral Higgs boson,
which is a part of the extra-dimensional component of the gauge fields, becomes
absolutely stable as a consequence of the gauge invariance and dynamically
generated new parity, serving as a promising candidate for cold dark matter
(CDM). We show that the observed relic abundance of cold dark matter is
obtained in the SO(5) x U(1) model in the warped space with the Higgs mass
around 70 GeV. The Higgs-nucleon scattering cross section is found to be close
to the current CDMS II and XENON10 bounds in the direct detection of dark
matter.
|
[
{
"created": "Mon, 3 Aug 2009 09:38:44 GMT",
"version": "v1"
}
] |
2010-04-29
|
[
[
"Hosotani",
"Yutaka",
""
],
[
"Ko",
"Pyungwon",
""
],
[
"Tanaka",
"Minoru",
""
]
] |
In a class of the gauge-Higgs unification models the 4D neutral Higgs boson, which is a part of the extra-dimensional component of the gauge fields, becomes absolutely stable as a consequence of the gauge invariance and dynamically generated new parity, serving as a promising candidate for cold dark matter (CDM). We show that the observed relic abundance of cold dark matter is obtained in the SO(5) x U(1) model in the warped space with the Higgs mass around 70 GeV. The Higgs-nucleon scattering cross section is found to be close to the current CDMS II and XENON10 bounds in the direct detection of dark matter.
|
hep-ph/9305210
| null |
L. Lavoura (Carnegie-Mellon University)
|
Comment on SU(16) grand unification
|
5 latex pages, 2 tables, no figures
|
Phys.Rev. D49 (1994) 575-578
|
10.1103/PhysRevD.49.575
| null |
hep-ph
| null |
In a recent paper on SU(16) grand unification, because of the presence of
intermediate-energy gauge groups containing products of U(1) factors which are
not orthogonal among themselves, the renormalization-group treatment has a few
small errors. I correct it. I emphasize that one should not switch gauge
couplings at the various thresholds. It is easier, and it avoids errors, to use
throughout the gauge couplings of the standard model, and compute at each
threshold, in the usual way, the extra contributions to the beta functions from
the extra non-decoupled fields. I also point out that the SU(16) grand
unification theory, due to the large number of scalars present in it, is not
asymptotically free. It becomes a strong-coupling theory at energies only
slightly larger than the unification scale.
|
[
{
"created": "Tue, 4 May 1993 19:31:33 GMT",
"version": "v1"
}
] |
2009-10-22
|
[
[
"Lavoura",
"L.",
"",
"Carnegie-Mellon University"
]
] |
In a recent paper on SU(16) grand unification, because of the presence of intermediate-energy gauge groups containing products of U(1) factors which are not orthogonal among themselves, the renormalization-group treatment has a few small errors. I correct it. I emphasize that one should not switch gauge couplings at the various thresholds. It is easier, and it avoids errors, to use throughout the gauge couplings of the standard model, and compute at each threshold, in the usual way, the extra contributions to the beta functions from the extra non-decoupled fields. I also point out that the SU(16) grand unification theory, due to the large number of scalars present in it, is not asymptotically free. It becomes a strong-coupling theory at energies only slightly larger than the unification scale.
|
1105.1968
|
Alberto Tonero
|
F. Bazzocchi, M. Fabbrichesi, R. Percacci, A. Tonero and L. Vecchi
|
Fermions and Goldstone bosons in an asymptotically safe model
|
7 pages, 3 figures, 1 table
| null |
10.1016/j.physletb.2011.10.029
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We consider a model in which Goldstone bosons, described by a SU(N) chiral
nonlinear sigma model, are coupled to an N-plet of colored fermions by means of
a Yukawa interaction. We study the one-loop renormalization group flow and show
that the non-Gaussian UV fixed point, which is present in the purely bosonic
model, is lost because of fermion loop effects unless N is sufficiently large.
We then add four-fermion contact interactions to the lagrangian and show that
in this case there exist several non-Gaussian fixed points. The strength of the
contact interactions, predicted by the requirement that the theory flows
towards a fixed point in the UV, is compared to the current experimental
bounds. This toy model could provide an important building block of an
asymptotically safe model of the weak interactions.
|
[
{
"created": "Tue, 10 May 2011 15:08:23 GMT",
"version": "v1"
}
] |
2015-05-28
|
[
[
"Bazzocchi",
"F.",
""
],
[
"Fabbrichesi",
"M.",
""
],
[
"Percacci",
"R.",
""
],
[
"Tonero",
"A.",
""
],
[
"Vecchi",
"L.",
""
]
] |
We consider a model in which Goldstone bosons, described by a SU(N) chiral nonlinear sigma model, are coupled to an N-plet of colored fermions by means of a Yukawa interaction. We study the one-loop renormalization group flow and show that the non-Gaussian UV fixed point, which is present in the purely bosonic model, is lost because of fermion loop effects unless N is sufficiently large. We then add four-fermion contact interactions to the lagrangian and show that in this case there exist several non-Gaussian fixed points. The strength of the contact interactions, predicted by the requirement that the theory flows towards a fixed point in the UV, is compared to the current experimental bounds. This toy model could provide an important building block of an asymptotically safe model of the weak interactions.
|
2207.04059
|
Henning Bahl
|
Henning Bahl, Wen Han Chiu, Christina Gao, Lian-Tao Wang, and Yi-Ming
Zhong
|
Tripling down on the $W$ boson mass
|
59 pages, 10 figures; v2: matches published version
| null |
10.1140/epjc/s10052-022-10934-5
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
A new precision measurement of the $W$ boson mass has been announced by the
CDF collaboration, which strongly deviates from the Standard Model prediction.
In this article, we study the implications of this measurement on the parameter
space of the $SU(2)_L$ triplet extension (with hypercharge $Y=1$) of the
Standard Model Higgs sector, focusing on a limit where the new triplet is
approximate $\mathbb{Z}_2$-odd while the SM is $\mathbb{Z}_2$-even. We study
the compatibility of the triplet spectrum preferred by the $W$ boson mass
measured by the CDF-II experiment with other electroweak precision observables
and Higgs precision data. We comprehensively consider the signals of new Higgs
states at the LHC and highlighted the promising search channels. In addition,
we also investigate the cosmological implications of the case in which the
lightest new Higgs particle is either late decaying or cosmologically stable.
|
[
{
"created": "Fri, 8 Jul 2022 18:00:00 GMT",
"version": "v1"
},
{
"created": "Thu, 27 Oct 2022 02:02:35 GMT",
"version": "v2"
}
] |
2022-11-09
|
[
[
"Bahl",
"Henning",
""
],
[
"Chiu",
"Wen Han",
""
],
[
"Gao",
"Christina",
""
],
[
"Wang",
"Lian-Tao",
""
],
[
"Zhong",
"Yi-Ming",
""
]
] |
A new precision measurement of the $W$ boson mass has been announced by the CDF collaboration, which strongly deviates from the Standard Model prediction. In this article, we study the implications of this measurement on the parameter space of the $SU(2)_L$ triplet extension (with hypercharge $Y=1$) of the Standard Model Higgs sector, focusing on a limit where the new triplet is approximate $\mathbb{Z}_2$-odd while the SM is $\mathbb{Z}_2$-even. We study the compatibility of the triplet spectrum preferred by the $W$ boson mass measured by the CDF-II experiment with other electroweak precision observables and Higgs precision data. We comprehensively consider the signals of new Higgs states at the LHC and highlighted the promising search channels. In addition, we also investigate the cosmological implications of the case in which the lightest new Higgs particle is either late decaying or cosmologically stable.
|
hep-ph/0008047
|
Diakonos Fotis
|
N.G. Antoniou, Y.F. Contoyiannis and F.K. Diakonos (Department of
Physics, University of Athens)
|
The Fractal Geometry of Critical Systems
|
1 LaTeX file, 4 figures in ps-files. Accepted for publication in
Physical Review E
|
Phys.Rev. E62 (2000) 3125-3134
|
10.1103/PhysRevE.62.3125
| null |
hep-ph
| null |
We investigate the geometry of a critical system undergoing a second order
thermal phase transition. Using a local description for the dynamics
characterizing the system at the critical point T=Tc, we reveal the formation
of clusters with fractal geometry, where the term cluster is used to describe
regions with a nonvanishing value of the order parameter. We show that,
treating the cluster as an open subsystem of the entire system, new
instanton-like configurations dominate the statistical mechanics of the
cluster. We study the dependence of the resulting fractal dimension on the
embedding dimension and the scaling properties (isothermal critical exponent)
of the system. Taking into account the finite size effects we are able to
calculate the size of the critical cluster in terms of the total size of the
system, the critical temperature and the effective coupling of the long
wavelength interaction at the critical point. We also show that the size of the
cluster has to be identified with the correlation length at criticality.
Finally, within the framework of the mean field approximation, we extend our
local considerations to obtain a global description of the system.
|
[
{
"created": "Fri, 4 Aug 2000 13:12:25 GMT",
"version": "v1"
}
] |
2009-10-31
|
[
[
"Antoniou",
"N. G.",
"",
"Department of\n Physics, University of Athens"
],
[
"Contoyiannis",
"Y. F.",
"",
"Department of\n Physics, University of Athens"
],
[
"Diakonos",
"F. K.",
"",
"Department of\n Physics, University of Athens"
]
] |
We investigate the geometry of a critical system undergoing a second order thermal phase transition. Using a local description for the dynamics characterizing the system at the critical point T=Tc, we reveal the formation of clusters with fractal geometry, where the term cluster is used to describe regions with a nonvanishing value of the order parameter. We show that, treating the cluster as an open subsystem of the entire system, new instanton-like configurations dominate the statistical mechanics of the cluster. We study the dependence of the resulting fractal dimension on the embedding dimension and the scaling properties (isothermal critical exponent) of the system. Taking into account the finite size effects we are able to calculate the size of the critical cluster in terms of the total size of the system, the critical temperature and the effective coupling of the long wavelength interaction at the critical point. We also show that the size of the cluster has to be identified with the correlation length at criticality. Finally, within the framework of the mean field approximation, we extend our local considerations to obtain a global description of the system.
|
hep-ph/9605263
|
shunzo Kumano
|
S. Kumano (Saga Univ.)
|
Parton Distributions in Nuclei: Overview and Prospect
|
11 pages, LATEX2e, 5 eps figures. Invited talk given at the Workshop
on "New Developments in QCD and Hadron Physics", Kyoto, Japan, Jan.22-24,
1996. Complete postscript file including the figures is available at
ftp://ftp.cc.saga-u.ac.jp/pub/paper/riko/quantum1/saga-he-98.ps.gz or at
http://www.cc.saga-u.ac.jp/saga-u/riko/physics/quantum1/kumano.html
| null | null |
SAGA-HE-98-96
|
hep-ph nucl-th
| null |
We give a brief overview of nuclear parton distributions. First, the EMC
effect is discussed together with possible interpretations such as nuclear
binding and $Q^2$ rescaling. Next, we explain shadowing descriptions:
vector-meson-dominance-type and parton-recombination models. Nuclear dependence
of $Q^2$ evolution should be interesting in testing whether or not DGLAP
equations could be applied to nuclear structure functions. Status of nuclear
sea-quark and gluon distributions is discussed. The structure function $b_1$,
which will be measured at HERMES and possibly at ELFE, could shed light on a
new aspect of high-energy spin physics.
|
[
{
"created": "Thu, 9 May 1996 08:26:38 GMT",
"version": "v1"
}
] |
2007-05-23
|
[
[
"Kumano",
"S.",
"",
"Saga Univ."
]
] |
We give a brief overview of nuclear parton distributions. First, the EMC effect is discussed together with possible interpretations such as nuclear binding and $Q^2$ rescaling. Next, we explain shadowing descriptions: vector-meson-dominance-type and parton-recombination models. Nuclear dependence of $Q^2$ evolution should be interesting in testing whether or not DGLAP equations could be applied to nuclear structure functions. Status of nuclear sea-quark and gluon distributions is discussed. The structure function $b_1$, which will be measured at HERMES and possibly at ELFE, could shed light on a new aspect of high-energy spin physics.
|
hep-ph/9912301
|
Alessandro Strumia
|
Andrea Romanino and Alessandro Strumia
|
Are heavy scalars natural in minimal supergravity?
|
4 pages. v2: dicussion clarified, final version
|
Phys.Lett.B487:165-170,2000
|
10.1016/S0370-2693(00)00806-6
|
IFUP-TH/63-99 and OUTP 99-64P
|
hep-ph
| null |
It has been recently claimed that very large values of a universal soft mass
term m_0 for sfermions and higgs bosons become natural when M_top is close to
175 GeV if tan\beta\approx 10. We show that very large values of m_0 require
accidental cancellations not guaranteed by experimental data or theoretical
assumptions, and consequently an unnatural fine-tuning of the parameters.
|
[
{
"created": "Fri, 10 Dec 1999 17:41:40 GMT",
"version": "v1"
},
{
"created": "Thu, 29 Jun 2000 13:58:13 GMT",
"version": "v2"
}
] |
2009-10-09
|
[
[
"Romanino",
"Andrea",
""
],
[
"Strumia",
"Alessandro",
""
]
] |
It has been recently claimed that very large values of a universal soft mass term m_0 for sfermions and higgs bosons become natural when M_top is close to 175 GeV if tan\beta\approx 10. We show that very large values of m_0 require accidental cancellations not guaranteed by experimental data or theoretical assumptions, and consequently an unnatural fine-tuning of the parameters.
|
2009.07852
|
Michael Shamma
|
Peter Adshead, Yanou Cui, Andrew J. Long, Michael Shamma
|
Unraveling the Dirac Neutrino with Cosmological and Terrestrial
Detectors
|
10 pages, 2 figures; v3: references added,
$m_{\nu,\text{sterile}}^{\text{eff}}$ is variable correlated with $\Delta
N_\text{eff}$ and $\Sigma m_\nu$, figures updated to include benchmark
models. Version matches that published in Physics Letters B
|
Physics Letters B 823C (2021) 136736
|
10.1016/j.physletb.2021.136736
| null |
hep-ph astro-ph.CO hep-ex
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We point out a correlation between the effective number of relativistic
degrees of species $\Delta N_\text{eff}$, the cosmologically measured
$m_{\nu,\text{sterile}}^{\text{eff}}$, and the terrestrially measured neutrino
mass sum and effective electron neutrino mass, $\Sigma m_\nu$ and $m_{\nu_e}$,
which arises in the Dirac neutrino hypothesis. If the neutrinos are Dirac
particles, and if the active neutrinos' sterile partners were once thermalized
in the early universe, then this new cosmological relic would simultaneously
contribute to the effective number of relativistic species, $\Delta
N_\text{eff}$, and also lead to a correlation between the
cosmologically-measured effective sterile neutrino mass
$m_{\nu,\text{sterile}}^\text{eff}$ and the terrestrially-measured active
neutrino mass sum $\Sigma m_\nu$. We emphasize that specifically correlated
deviations in $\Delta N_\text{eff}\gtrsim 3$,
$m_{\nu,\text{sterile}}^\text{eff}$ and $\Sigma m_\nu$ above their standard
predictions could be the harbinger revealing the Dirac nature of neutrinos. We
provide several benchmark examples, including Dirac leptogenesis, that predict
a thermal relic population of the sterile partners, and we discuss the relevant
observational prospects with current and near-future experiments. If the
correlation highlighted in this work is observed in future surveys, it could be
interpreted as supporting evidence of Dirac neutrino masses.
|
[
{
"created": "Wed, 16 Sep 2020 18:00:01 GMT",
"version": "v1"
},
{
"created": "Mon, 28 Sep 2020 19:59:41 GMT",
"version": "v2"
},
{
"created": "Mon, 25 Oct 2021 18:42:40 GMT",
"version": "v3"
}
] |
2021-10-27
|
[
[
"Adshead",
"Peter",
""
],
[
"Cui",
"Yanou",
""
],
[
"Long",
"Andrew J.",
""
],
[
"Shamma",
"Michael",
""
]
] |
We point out a correlation between the effective number of relativistic degrees of species $\Delta N_\text{eff}$, the cosmologically measured $m_{\nu,\text{sterile}}^{\text{eff}}$, and the terrestrially measured neutrino mass sum and effective electron neutrino mass, $\Sigma m_\nu$ and $m_{\nu_e}$, which arises in the Dirac neutrino hypothesis. If the neutrinos are Dirac particles, and if the active neutrinos' sterile partners were once thermalized in the early universe, then this new cosmological relic would simultaneously contribute to the effective number of relativistic species, $\Delta N_\text{eff}$, and also lead to a correlation between the cosmologically-measured effective sterile neutrino mass $m_{\nu,\text{sterile}}^\text{eff}$ and the terrestrially-measured active neutrino mass sum $\Sigma m_\nu$. We emphasize that specifically correlated deviations in $\Delta N_\text{eff}\gtrsim 3$, $m_{\nu,\text{sterile}}^\text{eff}$ and $\Sigma m_\nu$ above their standard predictions could be the harbinger revealing the Dirac nature of neutrinos. We provide several benchmark examples, including Dirac leptogenesis, that predict a thermal relic population of the sterile partners, and we discuss the relevant observational prospects with current and near-future experiments. If the correlation highlighted in this work is observed in future surveys, it could be interpreted as supporting evidence of Dirac neutrino masses.
|
hep-ph/0111186
|
Francesco Murgia
|
M. Anselmino (1), M. Boglione (2), U. D'Alesio (3), F. Murgia (3) ((1)
University and INFN, Torino, Italy, (2) University of Durham, United Kingdom,
(3) University and INFN, Cagliari, Italy)
|
Origins of single transverse spin asymmetries
|
LaTeX, 4 pages; Talk delivered by M. Anselmino at the "International
Workshop on the Spin Structure of the Proton and Polarized Collider Physics",
July 23-28, 2001, Trento, Italy
|
Nucl.Phys.Proc.Suppl. 105 (2002) 122-125; Int.J.Mod.Phys. A18
(2003) 1365-1372
|
10.1142/S0217751X03014721
| null |
hep-ph
| null |
Single transverse spin asymmetries in p-p -> pion + X and l-p -> l-pion + X
processes have been observed; their possible origins and connections are
investigated. A phenomenological description within a pQCD generalized
factorization scheme is discussed.
|
[
{
"created": "Thu, 15 Nov 2001 15:28:35 GMT",
"version": "v1"
}
] |
2009-11-07
|
[
[
"Anselmino",
"M.",
""
],
[
"Boglione",
"M.",
""
],
[
"D'Alesio",
"U.",
""
],
[
"Murgia",
"F.",
""
]
] |
Single transverse spin asymmetries in p-p -> pion + X and l-p -> l-pion + X processes have been observed; their possible origins and connections are investigated. A phenomenological description within a pQCD generalized factorization scheme is discussed.
|
1607.04671
|
Yonglin Zhu
|
Yong-Lin Zhu, Albino Perego, Gail C. McLaughlin
|
Matter Neutrino Resonance Transitions above a Neutron Star Merger
Remnant
|
13 pages, 11 figures
|
Phys. Rev. D 94, 105006 (2016)
|
10.1103/PhysRevD.94.105006
| null |
hep-ph astro-ph.HE nucl-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
The Matter-Neutrino Resonance (MNR) phenomenon has the potential to
significantly alter the flavor content of neutrinos emitted from compact object
mergers. We present the first calculations of MNR transitions using neutrino
self interaction potentials and matter potentials generated selfconsistently
from a dynamical model of a three-dimensional neutron star merger. In the
context of the single angle approximation, we find that Symmetric and Standard
MNR transitions occur in both normal and inverted hierarchy scenarios. We
examine the spatial regions above the merger remnant where propagating
neutrinos will encounter the matter neutrino resonance and find that a
significant fraction of the neutrinos are likely to undergo MNR transitions.
|
[
{
"created": "Fri, 15 Jul 2016 21:40:23 GMT",
"version": "v1"
}
] |
2016-11-15
|
[
[
"Zhu",
"Yong-Lin",
""
],
[
"Perego",
"Albino",
""
],
[
"McLaughlin",
"Gail C.",
""
]
] |
The Matter-Neutrino Resonance (MNR) phenomenon has the potential to significantly alter the flavor content of neutrinos emitted from compact object mergers. We present the first calculations of MNR transitions using neutrino self interaction potentials and matter potentials generated selfconsistently from a dynamical model of a three-dimensional neutron star merger. In the context of the single angle approximation, we find that Symmetric and Standard MNR transitions occur in both normal and inverted hierarchy scenarios. We examine the spatial regions above the merger remnant where propagating neutrinos will encounter the matter neutrino resonance and find that a significant fraction of the neutrinos are likely to undergo MNR transitions.
|
hep-ph/0611145
|
Jens Braun
|
Jens Braun
|
Chiral Phase Boundary of QCD from the Functional Renormalization Group
|
11 pages, 4 figures, Talk given at the 2006 ECT* School
"Renormalization Group and Effective Field Theory Approaches to Many-Body
Systems", Trento, Italy
| null | null | null |
hep-ph
| null |
We show how the functional renormalization group can be applied to a study of
chiral symmetry breaking in QCD. We discuss the running gauge coupling at
finite temperature for QCD. For scales smaller than the corresponding
temperature, the coupling is governed by a fixed point of the 3-dimensional
theory. Chiral symmetry breaking is approached if the running coupling drives
the quark sector to criticality. We analyze the phase boundary in the plane of
temperature and number of flavors. For small flavor-numbers, we find good
agreement with lattice results. For flavor numbers near the critical flavor
number, we find that the scaling of the critical temperature is determined by
the zero-temperature IR critical exponent of the running coupling.
|
[
{
"created": "Fri, 10 Nov 2006 17:00:43 GMT",
"version": "v1"
}
] |
2007-05-23
|
[
[
"Braun",
"Jens",
""
]
] |
We show how the functional renormalization group can be applied to a study of chiral symmetry breaking in QCD. We discuss the running gauge coupling at finite temperature for QCD. For scales smaller than the corresponding temperature, the coupling is governed by a fixed point of the 3-dimensional theory. Chiral symmetry breaking is approached if the running coupling drives the quark sector to criticality. We analyze the phase boundary in the plane of temperature and number of flavors. For small flavor-numbers, we find good agreement with lattice results. For flavor numbers near the critical flavor number, we find that the scaling of the critical temperature is determined by the zero-temperature IR critical exponent of the running coupling.
|
1003.2824
|
Joao Pires
|
E. W. N. Glover, Joao Pires (Durham U., IPPP)
|
Antenna subtraction for gluon scattering at NNLO
|
71 pages, JHEP3 class; corrected typos, equivalent but more compact
version of eq. (5.12), results unchanged
|
JHEP 1006:096,2010
|
10.1007/JHEP06(2010)096
|
IPPP/10/22
|
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We use the antenna subtraction method to isolate the double real radiation
infrared singularities present in gluonic scattering amplitudes at
next-to-next-to-leading order. The antenna subtraction framework has been
successfully applied to the calculation of NNLO corrections to the 3-jet cross
section and related event shape distributions in electron-positron
annihilation. Here we consider processes with two coloured particles in the
initial state, and in particular two-jet production at hadron colliders such as
the Large Hadron Collider (LHC). We construct a subtraction term that describes
the single and double unresolved contributions from the six-gluon tree-level
process using antenna functions with initial state partons and show numerically
that the subtraction term correctly approximates the matrix elements in the
various single and double unresolved configurations.
|
[
{
"created": "Sun, 14 Mar 2010 21:24:05 GMT",
"version": "v1"
},
{
"created": "Tue, 25 May 2010 14:37:34 GMT",
"version": "v2"
},
{
"created": "Fri, 16 Dec 2011 17:55:38 GMT",
"version": "v3"
}
] |
2015-03-13
|
[
[
"Glover",
"E. W. N.",
"",
"Durham U., IPPP"
],
[
"Pires",
"Joao",
"",
"Durham U., IPPP"
]
] |
We use the antenna subtraction method to isolate the double real radiation infrared singularities present in gluonic scattering amplitudes at next-to-next-to-leading order. The antenna subtraction framework has been successfully applied to the calculation of NNLO corrections to the 3-jet cross section and related event shape distributions in electron-positron annihilation. Here we consider processes with two coloured particles in the initial state, and in particular two-jet production at hadron colliders such as the Large Hadron Collider (LHC). We construct a subtraction term that describes the single and double unresolved contributions from the six-gluon tree-level process using antenna functions with initial state partons and show numerically that the subtraction term correctly approximates the matrix elements in the various single and double unresolved configurations.
|
hep-ph/0109103
|
Shouhua Zhu
|
Wolfgang Hollik and Shou-hua Zhu
|
$O(\alpha_s)$ Corrections to $b \bar b \to W^{\pm}H^{\mp}$ at the CERN
Large Hadron Collider
|
Initial-gluon contribution added, version to appear in PRD
|
Phys.Rev. D65 (2002) 075015
|
10.1103/PhysRevD.65.075015
| null |
hep-ph
| null |
The $O(\alpha_{s})$ corrections to the cross section for $b \bar b \to
W^{\pm}H^{\mp}$ at the LHC are calculated in the minimal supersymmetric
standard model (MSSM) in the $\bar{MS}$ and OS (on-mass-shell) renormalization
schemes. The results in two schemes are in good agreement. In the $\bar{MS}$
scheme, the QCD corrections are negative and within $ -14% \sim -20%$ for
charged Higgs mass up to 1 TeV and $\tan\beta >15$. For $\tan\beta =2$, the
magnitude of the QCD corrections can be greater than 30%.
|
[
{
"created": "Wed, 12 Sep 2001 11:31:19 GMT",
"version": "v1"
},
{
"created": "Mon, 4 Feb 2002 08:34:19 GMT",
"version": "v2"
}
] |
2009-11-07
|
[
[
"Hollik",
"Wolfgang",
""
],
[
"Zhu",
"Shou-hua",
""
]
] |
The $O(\alpha_{s})$ corrections to the cross section for $b \bar b \to W^{\pm}H^{\mp}$ at the LHC are calculated in the minimal supersymmetric standard model (MSSM) in the $\bar{MS}$ and OS (on-mass-shell) renormalization schemes. The results in two schemes are in good agreement. In the $\bar{MS}$ scheme, the QCD corrections are negative and within $ -14% \sim -20%$ for charged Higgs mass up to 1 TeV and $\tan\beta >15$. For $\tan\beta =2$, the magnitude of the QCD corrections can be greater than 30%.
|
hep-ph/9708251
|
Gordon Chalmers
|
G. Chalmers, W. Siegel
|
Simplifying Algebra in Feynman Graphs, Part I:Spinors
|
14 pg., plain tex, references added
|
Phys.Rev. D59 (1999) 045012
|
10.1103/PhysRevD.59.045012
|
ITP-SB-97-45
|
hep-ph hep-th
| null |
We present a general formalism for simplifying manipulations of spin indices
of massless and massive spinors and vectors in Feynman diagrams. The formalism
is based on covariantly reducing the number of field components in the action
in favor of chiral/self-dual fields. In this paper we concentrate on
calculational simplifications involving fermions in gauge theories by
eliminating half of the components of Dirac spinors. Some results are: (1) We
find reference momenta for massless fermions analogous to those used for
external gauge bosons. (2) Many of the known supersymmetry identities (tree and
one-loop) are seen in a simple manner from the graphs. (3) Manipulations with
external line factrs for massive fermions are unnecessary. (4) Some of the
simplifications for nearly maximally helicity violating gluonic amplitudes are
built into the Feynman rules.
|
[
{
"created": "Tue, 5 Aug 1997 18:38:11 GMT",
"version": "v1"
},
{
"created": "Thu, 18 Dec 1997 22:02:29 GMT",
"version": "v2"
}
] |
2009-10-30
|
[
[
"Chalmers",
"G.",
""
],
[
"Siegel",
"W.",
""
]
] |
We present a general formalism for simplifying manipulations of spin indices of massless and massive spinors and vectors in Feynman diagrams. The formalism is based on covariantly reducing the number of field components in the action in favor of chiral/self-dual fields. In this paper we concentrate on calculational simplifications involving fermions in gauge theories by eliminating half of the components of Dirac spinors. Some results are: (1) We find reference momenta for massless fermions analogous to those used for external gauge bosons. (2) Many of the known supersymmetry identities (tree and one-loop) are seen in a simple manner from the graphs. (3) Manipulations with external line factrs for massive fermions are unnecessary. (4) Some of the simplifications for nearly maximally helicity violating gluonic amplitudes are built into the Feynman rules.
|
1803.02463
|
Javier Mazzitelli
|
Massimiliano Grazzini, Gudrun Heinrich, Stephen Jones, Stefan
Kallweit, Matthias Kerner, Jonas M. Lindert and Javier Mazzitelli
|
Higgs boson pair production at NNLO with top quark mass effects
|
19 pages, 8 figures
| null |
10.1007/JHEP05(2018)059
|
CERN-TH-2018-044, IPPP/18/15, MPP-2018-30, ZU-TH 10/18
|
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We consider QCD radiative corrections to Higgs boson pair production through
gluon fusion in proton collisions. We combine the exact next-to-leading order
(NLO) contribution, which features two-loop virtual amplitudes with the full
dependence on the top quark mass $M_t$, with the next-to-next-to-leading order
(NNLO) corrections computed in the large-$M_t$ approximation. The latter are
improved with different reweighting techniques in order to account for
finite-$M_t$ effects beyond NLO. Our reference NNLO result is obtained by
combining one-loop double-real corrections with full $M_t$ dependence with
suitably reweighted real--virtual and double-virtual contributions evaluated in
the large-$M_t$ approximation. We present predictions for inclusive cross
sections in $pp$ collisions at $\sqrt{s}$=13, 14, 27 and 100TeV and we discuss
their uncertainties due to missing $M_t$ effects. Our approximated NNLO
corrections increase the NLO result by an amount ranging from +12% at
$\sqrt{s}$=13TeV to +7% at $\sqrt{s}$=100TeV, and the residual uncertainty from
missing $M_t$ effects is estimated to be at the few percent level. Our
calculation is fully differential in the Higgs boson pair and the associated
jet activity: we also present predictions for various differential
distributions at $\sqrt{s}$=14 and 100TeV. Our results represent the most
advanced perturbative prediction available to date for this process.
|
[
{
"created": "Tue, 6 Mar 2018 22:59:04 GMT",
"version": "v1"
}
] |
2018-06-13
|
[
[
"Grazzini",
"Massimiliano",
""
],
[
"Heinrich",
"Gudrun",
""
],
[
"Jones",
"Stephen",
""
],
[
"Kallweit",
"Stefan",
""
],
[
"Kerner",
"Matthias",
""
],
[
"Lindert",
"Jonas M.",
""
],
[
"Mazzitelli",
"Javier",
""
]
] |
We consider QCD radiative corrections to Higgs boson pair production through gluon fusion in proton collisions. We combine the exact next-to-leading order (NLO) contribution, which features two-loop virtual amplitudes with the full dependence on the top quark mass $M_t$, with the next-to-next-to-leading order (NNLO) corrections computed in the large-$M_t$ approximation. The latter are improved with different reweighting techniques in order to account for finite-$M_t$ effects beyond NLO. Our reference NNLO result is obtained by combining one-loop double-real corrections with full $M_t$ dependence with suitably reweighted real--virtual and double-virtual contributions evaluated in the large-$M_t$ approximation. We present predictions for inclusive cross sections in $pp$ collisions at $\sqrt{s}$=13, 14, 27 and 100TeV and we discuss their uncertainties due to missing $M_t$ effects. Our approximated NNLO corrections increase the NLO result by an amount ranging from +12% at $\sqrt{s}$=13TeV to +7% at $\sqrt{s}$=100TeV, and the residual uncertainty from missing $M_t$ effects is estimated to be at the few percent level. Our calculation is fully differential in the Higgs boson pair and the associated jet activity: we also present predictions for various differential distributions at $\sqrt{s}$=14 and 100TeV. Our results represent the most advanced perturbative prediction available to date for this process.
|
hep-ph/0608008
|
Shaaban Khalil
|
D. Delepine, G. Faisl, S. Khalil, and G. Lopez Castro
|
Supersymmetry and CP violation in |\Delta S|=1 tau-decays
|
16 pages, 3 figures
|
Phys.Rev.D74:056004,2006
|
10.1103/PhysRevD.74.056004
| null |
hep-ph
| null |
We compute the SUSY effective hamiltonian that describes the |\Delta S|=1
semileptonic decays of tau leptons. We provide analytical expressions for
supersymmetric contribution to tau --> u bar{s} nu_{tau} transition in mass
insertion approximation. We show that SUSY contributions may enhance the CP
asymmetry of tau --> K pi nu_{tau} decays by several orders of magnitude than
the standard model expectations. However, the resulting asymmetry is still well
below the current experimental limits obtained by CLEO collaborations. We
emphasize that measuring CP rate asymmetry in this decay larger than 10^{-6}
would be a clear evidence of physics beyond the supersymmetric extensions of
the standard model.
|
[
{
"created": "Tue, 1 Aug 2006 16:13:57 GMT",
"version": "v1"
}
] |
2008-11-26
|
[
[
"Delepine",
"D.",
""
],
[
"Faisl",
"G.",
""
],
[
"Khalil",
"S.",
""
],
[
"Castro",
"G. Lopez",
""
]
] |
We compute the SUSY effective hamiltonian that describes the |\Delta S|=1 semileptonic decays of tau leptons. We provide analytical expressions for supersymmetric contribution to tau --> u bar{s} nu_{tau} transition in mass insertion approximation. We show that SUSY contributions may enhance the CP asymmetry of tau --> K pi nu_{tau} decays by several orders of magnitude than the standard model expectations. However, the resulting asymmetry is still well below the current experimental limits obtained by CLEO collaborations. We emphasize that measuring CP rate asymmetry in this decay larger than 10^{-6} would be a clear evidence of physics beyond the supersymmetric extensions of the standard model.
|
1402.1664
|
Luca Silvestrini
|
UTfit Collaboration: A.J. Bevan, M. Bona, M. Ciuchini, D. Derkach, E.
Franco, V. Lubicz, G. Martinelli, F. Parodi, M. Pierini, C. Schiavi, L.
Silvestrini, V. Sordini, A. Stocchi, C. Tarantino, V. Vagnoni
|
The UTfit Collaboration Average of $D$ meson mixing data: Winter 2014
|
5 pages, 3 figures
| null | null | null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We update the analysis of $D$ meson mixing including the latest experimental
results as of January 2014. We derive constraints on the parameters $M_{12}$,
$\Gamma_{12}$ and $\Phi_{12}$ that describe $D$ meson mixing using all
available data, allowing for CP violation. We also provide posterior
distributions for observable parameters appearing in $D$ physics.
|
[
{
"created": "Fri, 7 Feb 2014 15:22:00 GMT",
"version": "v1"
}
] |
2014-02-10
|
[
[
"UTfit Collaboration",
"",
""
],
[
"Bevan",
"A. J.",
""
],
[
"Bona",
"M.",
""
],
[
"Ciuchini",
"M.",
""
],
[
"Derkach",
"D.",
""
],
[
"Franco",
"E.",
""
],
[
"Lubicz",
"V.",
""
],
[
"Martinelli",
"G.",
""
],
[
"Parodi",
"F.",
""
],
[
"Pierini",
"M.",
""
],
[
"Schiavi",
"C.",
""
],
[
"Silvestrini",
"L.",
""
],
[
"Sordini",
"V.",
""
],
[
"Stocchi",
"A.",
""
],
[
"Tarantino",
"C.",
""
],
[
"Vagnoni",
"V.",
""
]
] |
We update the analysis of $D$ meson mixing including the latest experimental results as of January 2014. We derive constraints on the parameters $M_{12}$, $\Gamma_{12}$ and $\Phi_{12}$ that describe $D$ meson mixing using all available data, allowing for CP violation. We also provide posterior distributions for observable parameters appearing in $D$ physics.
|
hep-ph/9704349
|
J. Gunion
|
J.F. Gunion (U.C. Davis)
|
A Simplified Summary of Supersymmetry
|
24 pages, to appear in ``Future High Energy Colliders'', proceedings
of the ITP Symposium, U.C. Santa Barbara, October 21-25, 1996, AIP Press.
Also presented at the Aspen Winter Conference on High Energy Physics, January
1997, Aspen, CO. Full postscript file, is available via anonymous ftp at
ftp://ucdhep.ucdavis.edu/gunion/itp96.ps
| null |
10.1063/1.52979
|
UCD-97-9
|
hep-ph hep-ex hep-th
| null |
I give an overview of the motivations for and theory/phenomenology of
supersymmetry.
|
[
{
"created": "Fri, 18 Apr 1997 03:40:43 GMT",
"version": "v1"
}
] |
2009-10-30
|
[
[
"Gunion",
"J. F.",
"",
"U.C. Davis"
]
] |
I give an overview of the motivations for and theory/phenomenology of supersymmetry.
|
hep-ph/9702381
|
Cvetic
|
G. Cvetic
|
Top quark condensation
|
latex (revtex), 103 pages, 13 eps-figures; the version as it appeared
in Rev. Mod. Phys. 71 (1999) 513-574 -- after the last Section, a note was
added to mention more recent works, several new references added
|
Rev.Mod.Phys.71:513-574,1999
|
10.1103/RevModPhys.71.513
| null |
hep-ph
| null |
Top quark condensation, in particular the minimal framework where the neutral
Higgs scalar is (predominantly) an effective ${\bar t} t$ condensate of the
Standard Model, is reviewed. Computational approaches are compared and
similarities, differences and deficiencies pointed out. Extensions of the
minimal framework, including scenarios with two composite Higgs doublets,
additional neutrino condensates, and ${\bar t}t$ condensation arising from
four-fermion interactions with enlarged symmetries, are described. Possible
renormalizable models of underlying physics potentially responsible for the
condensation, including topcolor assisted technicolor frameworks, are
discussed. Phenomenological implications of top condensate models are outlined.
Outstanding theoretical issues and problems for future investigation are
pointed out. Progress in the field after this article was accepted has been
briefly covered in a Note added at the end.
|
[
{
"created": "Fri, 21 Feb 1997 08:59:42 GMT",
"version": "v1"
},
{
"created": "Fri, 12 Jun 1998 16:06:53 GMT",
"version": "v2"
},
{
"created": "Mon, 11 Oct 1999 04:04:57 GMT",
"version": "v3"
}
] |
2008-11-26
|
[
[
"Cvetic",
"G.",
""
]
] |
Top quark condensation, in particular the minimal framework where the neutral Higgs scalar is (predominantly) an effective ${\bar t} t$ condensate of the Standard Model, is reviewed. Computational approaches are compared and similarities, differences and deficiencies pointed out. Extensions of the minimal framework, including scenarios with two composite Higgs doublets, additional neutrino condensates, and ${\bar t}t$ condensation arising from four-fermion interactions with enlarged symmetries, are described. Possible renormalizable models of underlying physics potentially responsible for the condensation, including topcolor assisted technicolor frameworks, are discussed. Phenomenological implications of top condensate models are outlined. Outstanding theoretical issues and problems for future investigation are pointed out. Progress in the field after this article was accepted has been briefly covered in a Note added at the end.
|
1602.07069
|
XiaoHai Liu
|
Xiao-Hai Liu and Makoto Oka
|
Understanding the nature of the heavy pentaquarks and searching for them
in pion-induced reactions
|
15 pages, 3 figures, 4 tables
| null |
10.1016/j.nuclphysa.2016.04.040
| null |
hep-ph hep-ex nucl-ex nucl-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We investigate the reaction $\pi^- p \to \pi^- J/\psi p$ via the open-charm
hadron rescattering diagrams. Due to the presence of the triangle singularity
(TS) in the rescattering amplitudes, the TS peaks can simulate the
pentaquark-like resonances arising in the $J/\psi p$ invariant mass
distributions, which may bring ambiguities on our understanding of the nature
of the exotic states. Searching for the heavy pentaquark in different processes
may help us to clarify the ambiguities, because of the highly process-dependent
characteristic of the TS mechanism.
|
[
{
"created": "Tue, 23 Feb 2016 07:47:56 GMT",
"version": "v1"
}
] |
2016-08-24
|
[
[
"Liu",
"Xiao-Hai",
""
],
[
"Oka",
"Makoto",
""
]
] |
We investigate the reaction $\pi^- p \to \pi^- J/\psi p$ via the open-charm hadron rescattering diagrams. Due to the presence of the triangle singularity (TS) in the rescattering amplitudes, the TS peaks can simulate the pentaquark-like resonances arising in the $J/\psi p$ invariant mass distributions, which may bring ambiguities on our understanding of the nature of the exotic states. Searching for the heavy pentaquark in different processes may help us to clarify the ambiguities, because of the highly process-dependent characteristic of the TS mechanism.
|
hep-ph/9712427
|
Hsin-Chia Cheng
|
Hsin-Chia Cheng (Fermilab)
|
Flavor and CP violations from sleptons at the muon collider
|
10 pages, 4 figures, LaTeX, Talk presented at the Workshop on Physics
at the First Muon Collider and at the Front End of a Muon Collider, Nov. 6-9,
1997, Fermilab
|
AIPConf.Proc.435:561-566,1998
|
10.1063/1.56220
|
Fermilab-CONF-97/418-T
|
hep-ph
| null |
Supersymmetric theories generally have new flavor and CP violation sources in
the squark and slepton mass matrices. They will contribute to the lepton flavor
violation processes, such as $\mu \to e \gamma$, which can be probed far below
the current bound with an intense muon source at the front end of the muon
collider. In addition, if sleptons can be produced at the muon collider, the
flavor violation can occur at their production and decay, allowing us to probe
the flavor mixing structure directly. Asymmetry between numbers of $\mu^+ e^-$
and $e^+ \mu^-$ events will be a sign for CP violation in supersymmetric flavor
mixing.
|
[
{
"created": "Wed, 17 Dec 1997 20:55:14 GMT",
"version": "v1"
}
] |
2009-10-30
|
[
[
"Cheng",
"Hsin-Chia",
"",
"Fermilab"
]
] |
Supersymmetric theories generally have new flavor and CP violation sources in the squark and slepton mass matrices. They will contribute to the lepton flavor violation processes, such as $\mu \to e \gamma$, which can be probed far below the current bound with an intense muon source at the front end of the muon collider. In addition, if sleptons can be produced at the muon collider, the flavor violation can occur at their production and decay, allowing us to probe the flavor mixing structure directly. Asymmetry between numbers of $\mu^+ e^-$ and $e^+ \mu^-$ events will be a sign for CP violation in supersymmetric flavor mixing.
|
1809.00713
|
Alexander Isayev
|
A. A. Isayev
|
Anisotropic pressure in strange quark matter in the presence of a strong
nonuniform magnetic field
|
6 pages, 3 figures
|
Phys. Rev. D 98: 043022, 2018
|
10.1103/PhysRevD.98.043022
| null |
hep-ph astro-ph.HE
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Thermodynamic properties of strange quark matter (SQM) in a nonuniform
magnetic field are studied within the phenomenological MIT bag model under the
charge neutrality and beta equilibrium conditions, relevant to the interior of
strange quark stars. The spatial dependence of the magnetic field strength is
modeled by the dependence on the baryon chemical potential in the exponential
and power forms. The total energy density, longitudinal and transverse
pressures in magnetized SQM are found as functions of the baryon chemical
potential. It is clarified that the central magnetic field strength in a
strange quark star is bound from above by the critical value at which the
derivative of the longitudinal pressure with respect to the baryon chemical
potential vanishes first somewhere in the interior of a star under varying the
central field. Above this upper bound, the instability along the magnetic field
is developed in magnetized SQM. The change in the form of the dependence of the
magnetic field strength on the baryon chemical potential between the
exponential and power ones has a nonnegligible effect on the critical magnetic
field strength while the variation of the bag pressure within the absolute
stability window for magnetized SQM has a little effect on the critical field.
|
[
{
"created": "Mon, 3 Sep 2018 20:21:49 GMT",
"version": "v1"
}
] |
2018-09-05
|
[
[
"Isayev",
"A. A.",
""
]
] |
Thermodynamic properties of strange quark matter (SQM) in a nonuniform magnetic field are studied within the phenomenological MIT bag model under the charge neutrality and beta equilibrium conditions, relevant to the interior of strange quark stars. The spatial dependence of the magnetic field strength is modeled by the dependence on the baryon chemical potential in the exponential and power forms. The total energy density, longitudinal and transverse pressures in magnetized SQM are found as functions of the baryon chemical potential. It is clarified that the central magnetic field strength in a strange quark star is bound from above by the critical value at which the derivative of the longitudinal pressure with respect to the baryon chemical potential vanishes first somewhere in the interior of a star under varying the central field. Above this upper bound, the instability along the magnetic field is developed in magnetized SQM. The change in the form of the dependence of the magnetic field strength on the baryon chemical potential between the exponential and power ones has a nonnegligible effect on the critical magnetic field strength while the variation of the bag pressure within the absolute stability window for magnetized SQM has a little effect on the critical field.
|
hep-ph/0610162
|
David London
|
Alakabha Datta, Ken Kiers, David London, Patrick J. O'Donnell and
Alejandro Szynkman
|
CP Violation in Hadronic tau Decays
|
21 pages, 2 figures (enclosed). Numerical analysis added; references
renumbered; figure changed. Analysis and conclusions unchanged
|
Phys.Rev.D75:074007,2007; Erratum-ibid.D76:079902,2007
|
10.1103/PhysRevD.75.074007 10.1103/PhysRevD.76.079902
|
UMiss-HEP-2006-017, UdeM-GPP-TH-06-152
|
hep-ph
| null |
We re-examine CP violation in the Delta S = 0 decays tau -> N pi nu_tau
(N=2,3,4). We assume that the new physics (NP) is a charged Higgs. We show that
there is no NP contribution to tau -> pi pi nu_tau, which means that no CP
violation is expected in this decay. On the other hand, NP can contribute to
tau -> N pi nu_tau (N=3,4). These are dominated by the intermediate resonant
decays tau -> omega pi nu_tau, tau -> rho pi nu_tau and tau -> a_1 pi nu_tau.
We show that the only sizeable CP-violating effects which are possible are in
tau -> a_1 pi nu_tau -> 4 pi nu_tau (polarization-dependent rate asymmetry) and
tau -> omega pi nu_tau (triple-product asymmetry).
|
[
{
"created": "Fri, 13 Oct 2006 10:27:29 GMT",
"version": "v1"
},
{
"created": "Sat, 24 Feb 2007 14:30:31 GMT",
"version": "v2"
}
] |
2014-11-18
|
[
[
"Datta",
"Alakabha",
""
],
[
"Kiers",
"Ken",
""
],
[
"London",
"David",
""
],
[
"O'Donnell",
"Patrick J.",
""
],
[
"Szynkman",
"Alejandro",
""
]
] |
We re-examine CP violation in the Delta S = 0 decays tau -> N pi nu_tau (N=2,3,4). We assume that the new physics (NP) is a charged Higgs. We show that there is no NP contribution to tau -> pi pi nu_tau, which means that no CP violation is expected in this decay. On the other hand, NP can contribute to tau -> N pi nu_tau (N=3,4). These are dominated by the intermediate resonant decays tau -> omega pi nu_tau, tau -> rho pi nu_tau and tau -> a_1 pi nu_tau. We show that the only sizeable CP-violating effects which are possible are in tau -> a_1 pi nu_tau -> 4 pi nu_tau (polarization-dependent rate asymmetry) and tau -> omega pi nu_tau (triple-product asymmetry).
|
2106.03888
|
Dibyashree Sengupta
|
Cheng-Wei Chiang, Sudip Jana, Dibyashree Sengupta
|
Investigating New Physics Models with Signature of Same-Sign Diboson +
${E\!\!/}_{T}$
|
35 pages, 13 figures, 100 TeV collider analysis included, matches
published version
|
Phys.Rev.D 105 (2022) 5, 055014
|
10.1103/PhysRevD.105.055014
| null |
hep-ph hep-ex
|
http://creativecommons.org/licenses/by/4.0/
|
We investigate the prospect of searching for new physics via the novel
signature of same-sign diboson + ${E\!\!/}_{T}$ at current and future LHC. We
study three new physics models: (i) natural SUSY models, (ii) type-III seesaw
model and (iii) type-II seesaw/Georgi-Machacek model. In the first two class of
models, this signature arises due to the presence of a singly-charged particle
which has lifetime long enough to escape detection, while in the third model
this signature originates resonantly from a doubly-charged particle produced
along with two forward jets that, most likely, would escape detection. We
analyze in great detail the discovery prospects of the signal in these three
classes of models in the current as well as the upcoming runs of the LHC (such
as HL-LHC, HE-LHC and FCC-hh) by showing a distinction among these scenarios.
|
[
{
"created": "Mon, 7 Jun 2021 18:06:42 GMT",
"version": "v1"
},
{
"created": "Wed, 16 Feb 2022 14:45:51 GMT",
"version": "v2"
}
] |
2022-03-25
|
[
[
"Chiang",
"Cheng-Wei",
""
],
[
"Jana",
"Sudip",
""
],
[
"Sengupta",
"Dibyashree",
""
]
] |
We investigate the prospect of searching for new physics via the novel signature of same-sign diboson + ${E\!\!/}_{T}$ at current and future LHC. We study three new physics models: (i) natural SUSY models, (ii) type-III seesaw model and (iii) type-II seesaw/Georgi-Machacek model. In the first two class of models, this signature arises due to the presence of a singly-charged particle which has lifetime long enough to escape detection, while in the third model this signature originates resonantly from a doubly-charged particle produced along with two forward jets that, most likely, would escape detection. We analyze in great detail the discovery prospects of the signal in these three classes of models in the current as well as the upcoming runs of the LHC (such as HL-LHC, HE-LHC and FCC-hh) by showing a distinction among these scenarios.
|
hep-ph/0111367
|
Oleg Selugin
|
E. Predazzi, O.V. Selyugin
|
Behavior of the Hadron Potential at Large Distances and Properties of
the Hadron Spin-flip Amplitude
|
13 pages, LaTeX, 3 figures.ps
|
Eur.Phys.J. A13 (2002) 471-475
| null | null |
hep-ph
| null |
The impact of the form of the hadron potential at large distances on the
behaviour of the hadron spin-flip amplitude at small angles is examined. The
$t$-dependence of the spin-flip amplitude of high energy hadron elastic
scattering is analyzed under different assumptions on the hadron interaction.
It is shown that the long tail of the non-Gaussian form of the hadron potential
of the hadron interaction in the impact parameter representation leads to a
large value of the slope of the spin-flip amplitude (without the kinematical
factor $\sqrt{|t|}$) as compared with the slope of the spin-non-flip amplitude.
This effect can explain the form of the differential cross section and the
analyzing power at small transfer momenta. The methods for the definition of
the spin-dependent part of the hadron scattering amplitude are presented. A
possibility to investigate the structure of the hadron spin-flip amplitude from
the accurate measure of the differential cross section and the spin correlation
parameters is shown.
|
[
{
"created": "Wed, 28 Nov 2001 10:58:22 GMT",
"version": "v1"
}
] |
2007-05-23
|
[
[
"Predazzi",
"E.",
""
],
[
"Selyugin",
"O. V.",
""
]
] |
The impact of the form of the hadron potential at large distances on the behaviour of the hadron spin-flip amplitude at small angles is examined. The $t$-dependence of the spin-flip amplitude of high energy hadron elastic scattering is analyzed under different assumptions on the hadron interaction. It is shown that the long tail of the non-Gaussian form of the hadron potential of the hadron interaction in the impact parameter representation leads to a large value of the slope of the spin-flip amplitude (without the kinematical factor $\sqrt{|t|}$) as compared with the slope of the spin-non-flip amplitude. This effect can explain the form of the differential cross section and the analyzing power at small transfer momenta. The methods for the definition of the spin-dependent part of the hadron scattering amplitude are presented. A possibility to investigate the structure of the hadron spin-flip amplitude from the accurate measure of the differential cross section and the spin correlation parameters is shown.
|
hep-ph/0501125
|
Elena G. Ferreiro
|
C. Pajares
|
String and Parton Percolation
|
7 pages, 6 figures. Plenary talk given at Hard Probes 2004, Ericeira,
Portugal
|
Eur.Phys.J.C43:9-14,2005
|
10.1140/epjc/s2005-02179-y
| null |
hep-ph
| null |
A brief review to string and parton percolation is presented. After a short
introduction, the main consequences of percolation of color sources on the
following observables in A-A collisions: $J/\psi$ suppression, saturation of
the multiplicity, dependence on the centrality of the transverse momentum
fluctuations, Cronin effect and transverse momentum distributions, strength of
the two and three body Bose-Einstein correlations and forward-backward
multiplicity correlations, are presented. The behaviour of all of them can be
naturally explained by the clustering of color sources and the dependence of
the fluctuations of the number of these clusters on the density.
|
[
{
"created": "Fri, 14 Jan 2005 18:03:23 GMT",
"version": "v1"
}
] |
2009-01-07
|
[
[
"Pajares",
"C.",
""
]
] |
A brief review to string and parton percolation is presented. After a short introduction, the main consequences of percolation of color sources on the following observables in A-A collisions: $J/\psi$ suppression, saturation of the multiplicity, dependence on the centrality of the transverse momentum fluctuations, Cronin effect and transverse momentum distributions, strength of the two and three body Bose-Einstein correlations and forward-backward multiplicity correlations, are presented. The behaviour of all of them can be naturally explained by the clustering of color sources and the dependence of the fluctuations of the number of these clusters on the density.
|
1409.3148
|
Gabriel Abelof
|
Gabriel Abelof, Aude Gehrmann-De Ridder
|
Light fermionic NNLO QCD corrections to top-antitop production in the
quark-antiquark channel
|
42 pages, 8 figures
| null |
10.1007/JHEP12(2014)076
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We present the NNLO corrections to top pair production in the quark-antiquark
channel proportional to the number of light quark flavors $N_l$. While the
double real corrections were derived previously, here we compute the
real-virtual and virtual-virtual contributions in this partonic channel. Using
the antenna subtraction formalism, we show that the subtraction terms correctly
approximate the real-virtual contributions in all their infrared limits.
Combined with the integrated forms of the double real and real-virtual
subtraction terms, we show analytically that the explicit infrared poles cancel
at the real-virtual and virtual-virtual levels respectively, thereby
demonstrating the validity of the massive extension of the NNLO antenna
formalism. These NNLO corrections are implemented in a Monte Carlo parton level
generator providing full kinematical information on an event-by event basis.
With this program, NNLO differential distributions in the form of binned
histograms are obtained and presented here.
|
[
{
"created": "Wed, 10 Sep 2014 16:50:53 GMT",
"version": "v1"
},
{
"created": "Wed, 17 Sep 2014 16:02:07 GMT",
"version": "v2"
},
{
"created": "Thu, 4 Dec 2014 06:36:26 GMT",
"version": "v3"
}
] |
2015-06-22
|
[
[
"Abelof",
"Gabriel",
""
],
[
"Ridder",
"Aude Gehrmann-De",
""
]
] |
We present the NNLO corrections to top pair production in the quark-antiquark channel proportional to the number of light quark flavors $N_l$. While the double real corrections were derived previously, here we compute the real-virtual and virtual-virtual contributions in this partonic channel. Using the antenna subtraction formalism, we show that the subtraction terms correctly approximate the real-virtual contributions in all their infrared limits. Combined with the integrated forms of the double real and real-virtual subtraction terms, we show analytically that the explicit infrared poles cancel at the real-virtual and virtual-virtual levels respectively, thereby demonstrating the validity of the massive extension of the NNLO antenna formalism. These NNLO corrections are implemented in a Monte Carlo parton level generator providing full kinematical information on an event-by event basis. With this program, NNLO differential distributions in the form of binned histograms are obtained and presented here.
|
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