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|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
0801.0536
|
Stanislaw Mrowczynski
|
Stanislaw Mrowczynski
|
Chromodynamic Fluctuations in Quark-Gluon Plasma
|
19 pages, numerous but minor corrections, to appear in Phys. Rev. D
|
Phys.Rev.D77:105022,2008
|
10.1103/PhysRevD.77.105022
| null |
hep-ph nucl-th
| null |
Fluctuations of chromodynamic fields in the collisionless quark-gluon plasma
are found as a solution of the initial value linearized problem. The plasma
initial state is on average colorless, stationary and homogeneous. When the
state is stable, the initial fluctuations decay exponentially and in the
long-time limit a stationary spectrum of fluctuations is established. For the
equilibrium plasma it reproduces the spectrum which is provided by the
fluctuation-dissipation relation. Fluctuations in the unstable plasma, where
the memory of initial fluctuations is not lost, are also discussed.
|
[
{
"created": "Thu, 3 Jan 2008 16:56:03 GMT",
"version": "v1"
},
{
"created": "Mon, 21 Jan 2008 16:04:41 GMT",
"version": "v2"
},
{
"created": "Fri, 4 Apr 2008 23:03:11 GMT",
"version": "v3"
}
] |
2008-11-26
|
[
[
"Mrowczynski",
"Stanislaw",
""
]
] |
Fluctuations of chromodynamic fields in the collisionless quark-gluon plasma are found as a solution of the initial value linearized problem. The plasma initial state is on average colorless, stationary and homogeneous. When the state is stable, the initial fluctuations decay exponentially and in the long-time limit a stationary spectrum of fluctuations is established. For the equilibrium plasma it reproduces the spectrum which is provided by the fluctuation-dissipation relation. Fluctuations in the unstable plasma, where the memory of initial fluctuations is not lost, are also discussed.
|
1202.5641
|
Marcus Pinto B
|
Sidney S. Avancini, D\'ebora P. Menezes, Marcus B. Pinto and
Constan\c{c}a Provid\^encia
|
The QCD Critical End Point Under Strong Magnetic Fields
|
5 pages, 2 figures
| null |
10.1103/PhysRevD.85.091901
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We use the three-flavor Nambu--Jona-Lasinio model, which includes strangeness
and quark physical masses in the mean field approximation, to investigate the
influence of strong magnetic fields on the QCD phase diagram covering the whole
$T-\mu$ plane. It is found that the size of the first order transition line
increases as the field strength increases so that a larger coexistence region
for hadronic and quark matter should be expected for strong magnetic fields.
The location of the critical end point is also affected by the presence of
magnetic fields which invariably increase the temperature value at which the
first order line terminates. On the other hand, the critical end point chemical
potential value displays a subtle oscillation around the B=0 value for magnetic
fields within the $10^{17}-10^{20} \, {\rm G}$ range. These findings may have
non trivial consequences for the physics of magnetars and heavy ion collisions.
|
[
{
"created": "Sat, 25 Feb 2012 11:13:14 GMT",
"version": "v1"
}
] |
2015-06-04
|
[
[
"Avancini",
"Sidney S.",
""
],
[
"Menezes",
"Débora P.",
""
],
[
"Pinto",
"Marcus B.",
""
],
[
"Providência",
"Constança",
""
]
] |
We use the three-flavor Nambu--Jona-Lasinio model, which includes strangeness and quark physical masses in the mean field approximation, to investigate the influence of strong magnetic fields on the QCD phase diagram covering the whole $T-\mu$ plane. It is found that the size of the first order transition line increases as the field strength increases so that a larger coexistence region for hadronic and quark matter should be expected for strong magnetic fields. The location of the critical end point is also affected by the presence of magnetic fields which invariably increase the temperature value at which the first order line terminates. On the other hand, the critical end point chemical potential value displays a subtle oscillation around the B=0 value for magnetic fields within the $10^{17}-10^{20} \, {\rm G}$ range. These findings may have non trivial consequences for the physics of magnetars and heavy ion collisions.
|
1610.04410
|
Tooraj Ghaffary
|
Tooraj Ghaffary
|
Comparing Production Cross Sections for QCD Matter, Higgs Boson,
Neutrino with Dark Energy in Accelerating Universe
|
23 pages; 8 figures
| null |
10.1142/S0219887817501390
| null |
hep-ph
|
http://creativecommons.org/licenses/by/4.0/
|
In this research, the production cross sections for QCD matter, neutrino and
dark energy due to acceleration of Universe is calculated. To obtain these
cross sections, the Universe production cross section is multiplied by the
particle or dark energy distribution in accelerating Universe. Also missing
cross section for each matter and dark energy due to formation of event
horizon, is calculated. It is clear that the cross section of particles
produced near event horizon of Universe is much larger for higher acceleration
of Universe. This is because as the acceleration of Universe becomes larger,
the Unruh temperature becomes larger and the thermal radiations of particles
are enhanced. There are different channels for producing Higgs boson in
accelerating Universe. Universe maybe decay to quark and gluons, and then these
particles interact with each other and Higgs boson is produced. Also, some
Higgs boson are emitted directly from event horizon of Universe. Comparing
Higgs boson cross sections via different channels, it is observed that at lower
acceleration, a_Universe<2.5 a_(early Universe), the Universe will not be able
to emit Higgs, but is still able to produce a quark and eventually for
a_Universe<1.5 a_(early Universe) the Universe can only emit massless gluons.
As the acceleration of Universe at the LHC increases, a_Universe>2.5 a_(early
Universe), most of Higgs boson production will be due to Unruh effect near
event horizon of Universe. Finally comparing the production cross section for
dark energy with particle cross sections, it is found that the cross section
for dark energy is dominated by QCD matter, Higgs boson and neutrino. This
result is consistent with previous predictions for dark energy cross section.
|
[
{
"created": "Fri, 14 Oct 2016 11:18:41 GMT",
"version": "v1"
},
{
"created": "Wed, 19 Oct 2016 00:23:41 GMT",
"version": "v2"
}
] |
2017-10-11
|
[
[
"Ghaffary",
"Tooraj",
""
]
] |
In this research, the production cross sections for QCD matter, neutrino and dark energy due to acceleration of Universe is calculated. To obtain these cross sections, the Universe production cross section is multiplied by the particle or dark energy distribution in accelerating Universe. Also missing cross section for each matter and dark energy due to formation of event horizon, is calculated. It is clear that the cross section of particles produced near event horizon of Universe is much larger for higher acceleration of Universe. This is because as the acceleration of Universe becomes larger, the Unruh temperature becomes larger and the thermal radiations of particles are enhanced. There are different channels for producing Higgs boson in accelerating Universe. Universe maybe decay to quark and gluons, and then these particles interact with each other and Higgs boson is produced. Also, some Higgs boson are emitted directly from event horizon of Universe. Comparing Higgs boson cross sections via different channels, it is observed that at lower acceleration, a_Universe<2.5 a_(early Universe), the Universe will not be able to emit Higgs, but is still able to produce a quark and eventually for a_Universe<1.5 a_(early Universe) the Universe can only emit massless gluons. As the acceleration of Universe at the LHC increases, a_Universe>2.5 a_(early Universe), most of Higgs boson production will be due to Unruh effect near event horizon of Universe. Finally comparing the production cross section for dark energy with particle cross sections, it is found that the cross section for dark energy is dominated by QCD matter, Higgs boson and neutrino. This result is consistent with previous predictions for dark energy cross section.
|
2405.01191
|
Guotao Xia
|
Lauri Niemi, Michael J. Ramsey-Musolf, Guotao Xia
|
Nonperturbative study of the electroweak phase transition in the real
scalar singlet extended Standard Model
|
23 pages, 13 figures
| null | null |
HIP-2024-7/TH, ACFI T24-03
|
hep-ph hep-lat
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We perform a nonperturbative lattice study of the electroweak phase
transition in the real singlet scalar extension of the Standard Model.We
consider both the heavy and light singlet-like scalar regimes at non-zero
singlet-doublet mixing angle. After reviewing features of the lattice method
relevant for phase transition studies, we analyze the dependence of phase
transition thermodynamics on phenomenologically relevant parameters. In the
heavy singlet-like scalar regime, we find that the transition is crossover for
small doublet-singlet mixing angles, despite the presence of an energy barrier
in the tree-level potential. The transition becomes first order for
sufficiently large mixing angles. We find two-loop perturbation theory to agree
closely with the lattice results for all thermodynamical quantities considered
here (critical temperature, order parameter discontinuity, latent heat) when
the transition is strongly first order. For the light singlet-like scalar
regime relevant to exotic Higgs decays, we update previous one-loop
perturbative results using the two-loop loop dimensionally reduced effective
field theory and assess the nature of the transition with lattice simulations
at set of benchmark parameter points. For fixed singlet-like scalar mass the
transition becomes crossover when the magnitude of the Higgs-singlet portal
coupling is small. We perform our simulations in the high-temperature effective
theory, which we briefly review, and present analytic expressions for the
relevant lattice-continuum relations.
|
[
{
"created": "Thu, 2 May 2024 11:32:02 GMT",
"version": "v1"
},
{
"created": "Sat, 10 Aug 2024 09:29:05 GMT",
"version": "v2"
}
] |
2024-08-13
|
[
[
"Niemi",
"Lauri",
""
],
[
"Ramsey-Musolf",
"Michael J.",
""
],
[
"Xia",
"Guotao",
""
]
] |
We perform a nonperturbative lattice study of the electroweak phase transition in the real singlet scalar extension of the Standard Model.We consider both the heavy and light singlet-like scalar regimes at non-zero singlet-doublet mixing angle. After reviewing features of the lattice method relevant for phase transition studies, we analyze the dependence of phase transition thermodynamics on phenomenologically relevant parameters. In the heavy singlet-like scalar regime, we find that the transition is crossover for small doublet-singlet mixing angles, despite the presence of an energy barrier in the tree-level potential. The transition becomes first order for sufficiently large mixing angles. We find two-loop perturbation theory to agree closely with the lattice results for all thermodynamical quantities considered here (critical temperature, order parameter discontinuity, latent heat) when the transition is strongly first order. For the light singlet-like scalar regime relevant to exotic Higgs decays, we update previous one-loop perturbative results using the two-loop loop dimensionally reduced effective field theory and assess the nature of the transition with lattice simulations at set of benchmark parameter points. For fixed singlet-like scalar mass the transition becomes crossover when the magnitude of the Higgs-singlet portal coupling is small. We perform our simulations in the high-temperature effective theory, which we briefly review, and present analytic expressions for the relevant lattice-continuum relations.
|
hep-ph/0105261
|
Steve King
|
S. F. King (Southampton University)
|
Neutrino Oscillations: Status, Prospects and Opportunities at a Neutrino
Factory
|
Updated to include the first SNO results and more references. 30
pages, Latex. To appear in J.Phys.G. This is a review article based on
invited talks at the IPPP Workshops on Physics at a Future Neutrino Factory,
19 January 2001, RAL and 21-23 March 2001, Durham
|
J.Phys.G27:2149-2170,2001
|
10.1088/0954-3899/27/10/313
| null |
hep-ph hep-ex hep-th
| null |
We review the current status of neutrino oscillations after 1258 days of
Super-Kamiokande, assess their future prospects over the next 10 years as the
next generation of experiments come on-line, and discuss the longer-term
opportunities presented by a Neutrino Factory. We also give an introduction to
the see-saw mechanism and its application to atmospheric and solar neutrinos.
|
[
{
"created": "Fri, 25 May 2001 12:46:49 GMT",
"version": "v1"
},
{
"created": "Wed, 27 Jun 2001 10:03:38 GMT",
"version": "v2"
}
] |
2010-05-28
|
[
[
"King",
"S. F.",
"",
"Southampton University"
]
] |
We review the current status of neutrino oscillations after 1258 days of Super-Kamiokande, assess their future prospects over the next 10 years as the next generation of experiments come on-line, and discuss the longer-term opportunities presented by a Neutrino Factory. We also give an introduction to the see-saw mechanism and its application to atmospheric and solar neutrinos.
|
hep-ph/9706423
|
Thomas Meissner
|
L.S. Kisslinger and T. Meissner
|
Structure of Vacuum Condensates
|
8pages (REVTEX), 1 PostScript figure
|
Phys.Rev.C57:1528-1531,1998
|
10.1103/PhysRevC.57.1528
| null |
hep-ph nucl-th
| null |
It is essential to know the space-time structure of the nonlocal vacuum
condensates for application to medium energy processes. Using the
Dyson-Schwinger formalism in the rainbow approximation for the quark
propagator, we study the nonlocal quark condensate and model forms for the
nonperturbative gluon propagator constrained by fits to local condensates and
deep inelastic scattering with nucleon targets.
|
[
{
"created": "Thu, 19 Jun 1997 20:40:09 GMT",
"version": "v1"
},
{
"created": "Sat, 7 Mar 1998 21:02:12 GMT",
"version": "v2"
}
] |
2008-11-26
|
[
[
"Kisslinger",
"L. S.",
""
],
[
"Meissner",
"T.",
""
]
] |
It is essential to know the space-time structure of the nonlocal vacuum condensates for application to medium energy processes. Using the Dyson-Schwinger formalism in the rainbow approximation for the quark propagator, we study the nonlocal quark condensate and model forms for the nonperturbative gluon propagator constrained by fits to local condensates and deep inelastic scattering with nucleon targets.
|
1211.3026
|
Ulf-G. Mei{\ss}ner
|
Ulf-G. Mei{\ss}ner
|
A walk through the world of chiral dynamics
|
Plenary talk, The 7th International Workshop on Chiral Dynamics,
August 6 -10, 2012, Jefferson Lab, Newport News, Virginia, USA, to appear in
the proceedings, references updated
| null | null | null |
hep-ph hep-ex hep-lat nucl-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Hadron-hadron scattering lengths are fine probes of our understanding of
nonperturbative QCD. I discuss the status of a variety of scattering processes
sensitive to the spontaneous and explicit chiral symmetry breaking of QCD, such
as pion-pion, pion-kaon, pion-nucleon, antikaon-nucleon and Goldstone boson
scattering off D-mesons. The fruitful interplay of theory, experiment and
lattice QCD is emphasized. I point out what has to be done in these fields to
gain further insight into these fundamental parameters.
|
[
{
"created": "Mon, 12 Nov 2012 20:07:14 GMT",
"version": "v1"
},
{
"created": "Wed, 3 Jul 2013 10:37:21 GMT",
"version": "v2"
}
] |
2013-07-04
|
[
[
"Meißner",
"Ulf-G.",
""
]
] |
Hadron-hadron scattering lengths are fine probes of our understanding of nonperturbative QCD. I discuss the status of a variety of scattering processes sensitive to the spontaneous and explicit chiral symmetry breaking of QCD, such as pion-pion, pion-kaon, pion-nucleon, antikaon-nucleon and Goldstone boson scattering off D-mesons. The fruitful interplay of theory, experiment and lattice QCD is emphasized. I point out what has to be done in these fields to gain further insight into these fundamental parameters.
|
1909.10836
|
Shengqin Feng
|
Bang-Xiang Chen, Sheng-Qin Feng
|
A systematical study of the chiral magnetic effects at the RHIC and LHC
energies
|
9 pages, 7 figures
|
Chinese Physics C 44, 024104 (2020)
|
10.1088/1674-1137/44/2/024104
| null |
hep-ph
|
http://creativecommons.org/licenses/by-nc-sa/4.0/
|
Considering the magnetic field response of the QGP medium, we perform a
systematical study of the chiral magnetic effect(CME), and make a comparison it
with the experimental results for the background-subtracted correlator $H$ at
the energies of the RHIC Beam Energy Scan (BES) and LHC energy. The CME signals
from our computations show a centrality trend and beam energy dependence that
are qualitatively consistent with the experimental measurements of the charge
dependent correlations. The time evolution of the chiral electromagnetic
current at the RHIC and LHC energies is systematically studied. The dependence
of the time-integrated current signal on the beam energy $\sqrt{s}$ with
different centralities is investigated. Our phenomenological analysis shows
that the time-integrated electromagnetic current is maximal near the collision
energy $\sqrt{s} \approx 39$ GeV. The qualitative trend of the induced
electromagnetic current is in agreement with the CME experimental results at
the RHIC and LHC energies.
|
[
{
"created": "Tue, 24 Sep 2019 12:22:15 GMT",
"version": "v1"
},
{
"created": "Sun, 22 Dec 2019 09:46:17 GMT",
"version": "v2"
}
] |
2022-01-10
|
[
[
"Chen",
"Bang-Xiang",
""
],
[
"Feng",
"Sheng-Qin",
""
]
] |
Considering the magnetic field response of the QGP medium, we perform a systematical study of the chiral magnetic effect(CME), and make a comparison it with the experimental results for the background-subtracted correlator $H$ at the energies of the RHIC Beam Energy Scan (BES) and LHC energy. The CME signals from our computations show a centrality trend and beam energy dependence that are qualitatively consistent with the experimental measurements of the charge dependent correlations. The time evolution of the chiral electromagnetic current at the RHIC and LHC energies is systematically studied. The dependence of the time-integrated current signal on the beam energy $\sqrt{s}$ with different centralities is investigated. Our phenomenological analysis shows that the time-integrated electromagnetic current is maximal near the collision energy $\sqrt{s} \approx 39$ GeV. The qualitative trend of the induced electromagnetic current is in agreement with the CME experimental results at the RHIC and LHC energies.
|
1410.0410
|
Tommy Ohlsson
|
Sandhya Choubey and Tommy Ohlsson
|
Bounds on Non-Standard Neutrino Interactions Using PINGU
|
19 pages, 7 figures. Final version published in Phys. Lett. B
|
Phys. Lett. B 739 (2014) 357
|
10.1016/j.physletb.2014.11.010
|
NSF-KITP-14-173
|
hep-ph astro-ph.HE hep-ex
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We investigate the impact of non-standard neutrino interactions (NSIs) on
atmospheric neutrinos using the proposed PINGU experiment. In particular, we
focus on the matter NSI parameters $\varepsilon_{\mu\tau}$ and
$|\varepsilon_{\tau\tau} - \varepsilon_{\mu\mu}|$ that have previously been
constrained by the Super-Kamiokande experiment. First, we present approximate
analytical formulas for the difference of the muon neutrino survival
probability with and without the above-mentioned NSI parameters. Second, we
calculate the atmospheric neutrino events at PINGU in the energy range (2-100)
GeV, which follow the trend outlined on probability level. Finally, we perform
a statistical analysis of PINGU. Using three years of data, we obtain bounds
from PINGU given by $-0.0043~(-0.0048) < \varepsilon_{\mu\tau} <
0.0047~(0.0046)$ and $-0.03~(-0.016) < \varepsilon_{\tau\tau} < 0.017~(0.032)$
at 90 % confidence level for normal (inverted) neutrino mass hierarchy, which
improve the Super-Kamiokande bounds by one order of magnitude. In addition, we
show the expected allowed contour region in the
$\varepsilon_{\mu\tau}$-$\varepsilon_{\tau\tau}$ plane if NSIs exist in Nature
and the result suggests that there is basically no correlation between
$\varepsilon_{\mu\tau}$ and $\varepsilon_{\tau\tau}$.
|
[
{
"created": "Wed, 1 Oct 2014 23:10:12 GMT",
"version": "v1"
},
{
"created": "Tue, 18 Nov 2014 09:57:07 GMT",
"version": "v2"
}
] |
2014-11-19
|
[
[
"Choubey",
"Sandhya",
""
],
[
"Ohlsson",
"Tommy",
""
]
] |
We investigate the impact of non-standard neutrino interactions (NSIs) on atmospheric neutrinos using the proposed PINGU experiment. In particular, we focus on the matter NSI parameters $\varepsilon_{\mu\tau}$ and $|\varepsilon_{\tau\tau} - \varepsilon_{\mu\mu}|$ that have previously been constrained by the Super-Kamiokande experiment. First, we present approximate analytical formulas for the difference of the muon neutrino survival probability with and without the above-mentioned NSI parameters. Second, we calculate the atmospheric neutrino events at PINGU in the energy range (2-100) GeV, which follow the trend outlined on probability level. Finally, we perform a statistical analysis of PINGU. Using three years of data, we obtain bounds from PINGU given by $-0.0043~(-0.0048) < \varepsilon_{\mu\tau} < 0.0047~(0.0046)$ and $-0.03~(-0.016) < \varepsilon_{\tau\tau} < 0.017~(0.032)$ at 90 % confidence level for normal (inverted) neutrino mass hierarchy, which improve the Super-Kamiokande bounds by one order of magnitude. In addition, we show the expected allowed contour region in the $\varepsilon_{\mu\tau}$-$\varepsilon_{\tau\tau}$ plane if NSIs exist in Nature and the result suggests that there is basically no correlation between $\varepsilon_{\mu\tau}$ and $\varepsilon_{\tau\tau}$.
|
hep-ph/0212210
|
Hamid Beshtoev
|
Kh. M. Beshtoev
|
Some Unsettled Questions in the Problem of Neutrino Oscillations
|
LATEX, 20 pages, no figures and tables
| null | null | null |
hep-ph
| null |
It is noted that the theory of neutrino oscillations can be constructed only
in the framework of the particle physics theory, where is a mass shell
conception and then transitions (oscillations) between neutrinos with equal
masses are real and between neutrinos with different masses are virtual. It is
necessary to solve the question: which type of neutrino transitions
(oscillations) is realized in nature? There can be three types of neutrino
transitions (oscillations). At present it is considered that Dirac and Majorana
neutrino oscillations can be realized. It is shown that we cannot put Majorana
neutrinos in the standard weak interactions theory without violation of the
gauge invariance. Then it is obvious that there can be only realized
transitions (oscillations) between Dirac neutrinos with different flowers. Also
it is shown that the mechanism of resonance enhancement of neutrino
oscillations in matter cannot be realized without violation of the law of
energy-momentum conservation. Though it is supposed that we see neutrino
oscillations in experiments, indeed there only transitions between neutrinos
are registered. In order to register neutrino oscillations it is necessary to
see second or even higher neutrino oscillation modes in experiments. For this
purpose we can use the elliptic character of the Earth orbit. The analysis
shows that the SNO experimental results do not confirm smallest of nu_e to
nu_\tau transition angle mixings, which was obtained in CHOOZ experiment. It is
also noted that there is contradiction between SNO, Super-Kamiokande, Homestake
and the SAGE and GNO (GALLEX) data.
|
[
{
"created": "Sun, 15 Dec 2002 13:38:12 GMT",
"version": "v1"
}
] |
2007-05-23
|
[
[
"Beshtoev",
"Kh. M.",
""
]
] |
It is noted that the theory of neutrino oscillations can be constructed only in the framework of the particle physics theory, where is a mass shell conception and then transitions (oscillations) between neutrinos with equal masses are real and between neutrinos with different masses are virtual. It is necessary to solve the question: which type of neutrino transitions (oscillations) is realized in nature? There can be three types of neutrino transitions (oscillations). At present it is considered that Dirac and Majorana neutrino oscillations can be realized. It is shown that we cannot put Majorana neutrinos in the standard weak interactions theory without violation of the gauge invariance. Then it is obvious that there can be only realized transitions (oscillations) between Dirac neutrinos with different flowers. Also it is shown that the mechanism of resonance enhancement of neutrino oscillations in matter cannot be realized without violation of the law of energy-momentum conservation. Though it is supposed that we see neutrino oscillations in experiments, indeed there only transitions between neutrinos are registered. In order to register neutrino oscillations it is necessary to see second or even higher neutrino oscillation modes in experiments. For this purpose we can use the elliptic character of the Earth orbit. The analysis shows that the SNO experimental results do not confirm smallest of nu_e to nu_\tau transition angle mixings, which was obtained in CHOOZ experiment. It is also noted that there is contradiction between SNO, Super-Kamiokande, Homestake and the SAGE and GNO (GALLEX) data.
|
hep-ph/9310380
|
Matsuda Masahisa
|
Takemi Hayashi, Masahisa Matsuda and Morimitsu Tanimoto
|
Penguin Effects on K Pi and PiPi Decays of the $B$ Meson
|
LATEX-file without figures. Figures will be sent by request to
masa@auephyas.aichi-edu.ac.jp
|
Phys.Lett.B323:78-84,1994
|
10.1016/0370-2693(94)00045-X
|
AUE-05-93,EHU-06-93, KGU-03-93
|
hep-ph
| null |
We give the detailed analyses for the gluonic-penguin effect on the $\kp$ and
$\pp$ decays of the $B$ meson. In the standard model, it is shown that the
ratio $BR(B\A\kp)/BR(B\A\pp)$ takes the value $0.5\sim 3.0$ with the strongly
depending on the CP violating phase $\phi$ and the KM matrix element
$|V_{ub}|$. We obtain the constraint on the form factor by using the
experimental branching ratio. It is also found that, in the two-Higgs-doublet
model, the charged Higgs contribution which could enhance the $B\A X_s\r$ decay
does not a sizable effect on our processes. The effect of the final state
interaction on these processes is also discussed.
|
[
{
"created": "Mon, 1 Nov 1993 02:56:45 GMT",
"version": "v1"
}
] |
2010-11-01
|
[
[
"Hayashi",
"Takemi",
""
],
[
"Matsuda",
"Masahisa",
""
],
[
"Tanimoto",
"Morimitsu",
""
]
] |
We give the detailed analyses for the gluonic-penguin effect on the $\kp$ and $\pp$ decays of the $B$ meson. In the standard model, it is shown that the ratio $BR(B\A\kp)/BR(B\A\pp)$ takes the value $0.5\sim 3.0$ with the strongly depending on the CP violating phase $\phi$ and the KM matrix element $|V_{ub}|$. We obtain the constraint on the form factor by using the experimental branching ratio. It is also found that, in the two-Higgs-doublet model, the charged Higgs contribution which could enhance the $B\A X_s\r$ decay does not a sizable effect on our processes. The effect of the final state interaction on these processes is also discussed.
|
1412.3967
|
Malin Sjodahl
|
Malin Sjodahl
|
ColorFull -- a C++ library for calculations in SU(Nc) color space
|
Version accepted by EPJC, improved description of trace bases in
section 3
|
Eur. Phys. J. C 75 (2015) 5, 236
| null |
LU TP 14-43, MCNET-14-26
|
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
ColorFull, a C++ package for treating QCD color structure, is presented.
ColorFull, which utilizes the trace basis approach, is intended for interfacing
with event generators, but can also be used as a stand-alone package for
squaring QCD amplitudes, calculating interferences, and describing the effect
of gluon emission and gluon exchange.
|
[
{
"created": "Fri, 12 Dec 2014 12:26:22 GMT",
"version": "v1"
},
{
"created": "Mon, 29 Jun 2015 09:58:21 GMT",
"version": "v2"
}
] |
2015-06-30
|
[
[
"Sjodahl",
"Malin",
""
]
] |
ColorFull, a C++ package for treating QCD color structure, is presented. ColorFull, which utilizes the trace basis approach, is intended for interfacing with event generators, but can also be used as a stand-alone package for squaring QCD amplitudes, calculating interferences, and describing the effect of gluon emission and gluon exchange.
|
1505.06165
|
Ivo de Medeiros Varzielas
|
Gustavo C. Branco, Ivo de Medeiros Varzielas, Stephen F. King
|
Invariant approach to CP in unbroken $\Delta(27)$
|
24 pages, 1 figure. v2: to be published in NPB
| null |
10.1016/j.nuclphysb.2015.07.024
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
The invariant approach is a powerful method for studying CP violation for
specific Lagrangians. The method is particularly useful for dealing with
discrete family symmetries. We focus on the CP properties of unbroken
$\Delta(27)$ invariant Lagrangians with Yukawa-like terms, which proves to be a
rich framework, with distinct aspects of CP, making it an ideal group to
investigate with the invariant approach. We classify Lagrangians depending on
the number of fields transforming as irreducible triplet representations of
$\Delta(27)$. For each case, we construct CP-odd weak basis invariants and use
them to discuss the respective CP properties. We find that CP violation is
sensitive to the number and type of $\Delta(27)$ representations.
|
[
{
"created": "Fri, 22 May 2015 18:00:27 GMT",
"version": "v1"
},
{
"created": "Mon, 3 Aug 2015 14:32:03 GMT",
"version": "v2"
}
] |
2015-12-09
|
[
[
"Branco",
"Gustavo C.",
""
],
[
"Varzielas",
"Ivo de Medeiros",
""
],
[
"King",
"Stephen F.",
""
]
] |
The invariant approach is a powerful method for studying CP violation for specific Lagrangians. The method is particularly useful for dealing with discrete family symmetries. We focus on the CP properties of unbroken $\Delta(27)$ invariant Lagrangians with Yukawa-like terms, which proves to be a rich framework, with distinct aspects of CP, making it an ideal group to investigate with the invariant approach. We classify Lagrangians depending on the number of fields transforming as irreducible triplet representations of $\Delta(27)$. For each case, we construct CP-odd weak basis invariants and use them to discuss the respective CP properties. We find that CP violation is sensitive to the number and type of $\Delta(27)$ representations.
|
1807.01125
|
Ferruccio Feruglio
|
Juan Carlos Criado and Ferruccio Feruglio
|
Modular Invariance Faces Precision Neutrino Data
|
29 pages, 1 figure; further comments, one on the quark sector, added
|
SciPost Phys. 5, 042 (2018)
|
10.21468/SciPostPhys.5.5.042
| null |
hep-ph hep-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We analyze a modular invariant model of lepton masses, with neutrino masses
originating either from the Weinberg operator or from the seesaw. The
constraint provided by modular invariance is so strong that neutrino mass
ratios, lepton mixing angles and Dirac/Majorana phases do not depend on any
Lagrangian parameter. They only depend on the vacuum of the theory,
parametrized in terms of a complex modulus and a real field. Thus eight
measurable quantities are described by the three vacuum parameters, whose
optimization provides an excellent fit to data for the Weinberg operator and a
good fit for the seesaw case. Neutrino masses from the Weinberg operator
(seesaw) have inverted (normal) ordering. Several sources of potential
corrections, such as higher dimensional operators, renormalization group
evolution and supersymmetry breaking effects, are carefully discussed and shown
not to affect the predictions under reasonable conditions.
|
[
{
"created": "Tue, 3 Jul 2018 12:44:03 GMT",
"version": "v1"
},
{
"created": "Mon, 16 Jul 2018 17:19:57 GMT",
"version": "v2"
},
{
"created": "Tue, 25 Sep 2018 12:57:47 GMT",
"version": "v3"
}
] |
2018-11-07
|
[
[
"Criado",
"Juan Carlos",
""
],
[
"Feruglio",
"Ferruccio",
""
]
] |
We analyze a modular invariant model of lepton masses, with neutrino masses originating either from the Weinberg operator or from the seesaw. The constraint provided by modular invariance is so strong that neutrino mass ratios, lepton mixing angles and Dirac/Majorana phases do not depend on any Lagrangian parameter. They only depend on the vacuum of the theory, parametrized in terms of a complex modulus and a real field. Thus eight measurable quantities are described by the three vacuum parameters, whose optimization provides an excellent fit to data for the Weinberg operator and a good fit for the seesaw case. Neutrino masses from the Weinberg operator (seesaw) have inverted (normal) ordering. Several sources of potential corrections, such as higher dimensional operators, renormalization group evolution and supersymmetry breaking effects, are carefully discussed and shown not to affect the predictions under reasonable conditions.
|
1504.02299
|
Marco Frasca
|
Marco Frasca
|
A theorem on the Higgs sector of the Standard Model
|
15 pages, no figure. Version accepted for publication in European
Physical Journal Plus
|
Eur. Phys. J. Plus (2016) 131: 199
|
10.1140/epjp/i2016-16199-x
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We provide the solution of the classical theory for the Higgs sector of the
Standard Model obtaining the exact Green function for the broken phase. Solving
the Dyson-Schwinger equations for the Higgs field we show that the propagator
coincides with that of the classical theory confirming the spectrum also at the
quantum level. In this way we obtain a proof of triviality using the
K\"allen-Lehman representation. This has as a consequence that higher excited
states must exist for the Higgs particle, representing an internal spectrum for
it. Higher excited states have exponentially smaller amplitudes and so, their
production rates are significantly depressed.
|
[
{
"created": "Thu, 9 Apr 2015 13:22:28 GMT",
"version": "v1"
},
{
"created": "Fri, 4 Sep 2015 16:29:49 GMT",
"version": "v2"
},
{
"created": "Thu, 19 May 2016 08:04:23 GMT",
"version": "v3"
}
] |
2016-06-16
|
[
[
"Frasca",
"Marco",
""
]
] |
We provide the solution of the classical theory for the Higgs sector of the Standard Model obtaining the exact Green function for the broken phase. Solving the Dyson-Schwinger equations for the Higgs field we show that the propagator coincides with that of the classical theory confirming the spectrum also at the quantum level. In this way we obtain a proof of triviality using the K\"allen-Lehman representation. This has as a consequence that higher excited states must exist for the Higgs particle, representing an internal spectrum for it. Higher excited states have exponentially smaller amplitudes and so, their production rates are significantly depressed.
|
hep-ph/0209243
|
John Arrington
|
J. Arrington
|
How Well Do We Know the Electromagnetic Form Factors of the Proton?
|
5 pages, 4 figures; Invited talk at Electron-Nucleus Scattering VII,
Elba, Italy, June 2002 (to appear in proceedings)
|
Eur.Phys.J.A17:311-315,2003
|
10.1140/epja/i2002-10172-y
| null |
hep-ph nucl-ex
| null |
Recent measurements of recoil polarization in elastic scattering have been
used to extract the ratio of the electric to the magnetic proton form factors.
These results disagree with Rosenbluth extractions from cross section
measurements, indicating either an inconsistency between the two techniques, or
a problem with either the polarization transfer or cross section measurements.
To obtain precise knowledge of the proton form factors, we must first
understand the source of this discrepancy.
|
[
{
"created": "Fri, 20 Sep 2002 17:38:07 GMT",
"version": "v1"
}
] |
2009-09-24
|
[
[
"Arrington",
"J.",
""
]
] |
Recent measurements of recoil polarization in elastic scattering have been used to extract the ratio of the electric to the magnetic proton form factors. These results disagree with Rosenbluth extractions from cross section measurements, indicating either an inconsistency between the two techniques, or a problem with either the polarization transfer or cross section measurements. To obtain precise knowledge of the proton form factors, we must first understand the source of this discrepancy.
|
1303.2540
|
Tobias Beranek
|
T. Beranek, H. Merkel, M. Vanderhaeghen
|
Theoretical framework to analyze searches for hidden light gauge bosons
in electron scattering fixed target experiments
|
18 pages, 12 figures
| null |
10.1103/PhysRevD.88.015032
| null |
hep-ph hep-ex
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Motivated by anomalies in cosmic ray observations and by attempts to solve
questions of the Standad Model of particle physics like the (g-2)_mu
discrepancy, U(1) extensions of the Standard Model have been proposed in recent
years. Such U(1) extensions allow for the interaction of Dark Matter by
exchange of a photon-like massive force carrier \gamma' not included in the
Standard Model. In order to search for \gamma' bosons various experimental
programs have been started. One approach is the dedicated search at
fixed-target experiments at modest energies as performed at MAMI or at the
Jefferson Lab. In these experiments the process e(A,Z)->e(A,Z)l^+l^- is
investigated and a search for a very narrow resonance in the invariant mass
distribution of the l^+l^- pair is performed. In this work we analyze this
process in terms of signal and background in order to describe existing data
obtained by the A1 experiment at MAMI with the aim to give accurate predictions
for exclusion limits in the \gamma' parameter space. We present a detailed
theoretical analysis of the cross sections entering in the description of such
processes.
|
[
{
"created": "Mon, 11 Mar 2013 14:42:39 GMT",
"version": "v1"
}
] |
2015-06-15
|
[
[
"Beranek",
"T.",
""
],
[
"Merkel",
"H.",
""
],
[
"Vanderhaeghen",
"M.",
""
]
] |
Motivated by anomalies in cosmic ray observations and by attempts to solve questions of the Standad Model of particle physics like the (g-2)_mu discrepancy, U(1) extensions of the Standard Model have been proposed in recent years. Such U(1) extensions allow for the interaction of Dark Matter by exchange of a photon-like massive force carrier \gamma' not included in the Standard Model. In order to search for \gamma' bosons various experimental programs have been started. One approach is the dedicated search at fixed-target experiments at modest energies as performed at MAMI or at the Jefferson Lab. In these experiments the process e(A,Z)->e(A,Z)l^+l^- is investigated and a search for a very narrow resonance in the invariant mass distribution of the l^+l^- pair is performed. In this work we analyze this process in terms of signal and background in order to describe existing data obtained by the A1 experiment at MAMI with the aim to give accurate predictions for exclusion limits in the \gamma' parameter space. We present a detailed theoretical analysis of the cross sections entering in the description of such processes.
|
hep-ph/0609290
|
Stefano Profumo
|
Stefano Profumo and Alessio Provenza
|
Increasing the Neutralino Relic Abundance with Slepton Coannihilations:
Consequences for Indirect Dark Matter Detection
|
16 pages, 6 figures, references added, typos corrected, matches with
the published version
|
JCAP0612:019,2006
|
10.1088/1475-7516/2006/12/019
|
SISSA-56/2006/EP
|
hep-ph astro-ph
| null |
We point out that if the lightest supersymmetric particle (LSP) is a
Higgsino- or Wino-like neutralino, the net effect of coannihilations with
sleptons is to increase the relic abundance, rather than producing the usual
suppression, which takes place if the LSP is Bino-like. The reason for the
enhancement lies in the effective thermally averaged cross section at
freeze-out: sleptons annihilate (and co-annihilate) less efficiently than the
neutralino(s)-chargino system, therefore slepton coannihilations effectively
act as parasite degrees of freedom at freeze-out. Henceforth, the thermal relic
abundance of LSP's corresponds to the cold Dark Matter abundance for smaller
values of the LSP mass, and larger values of the neutralino pair annihilation
cross section. In turn, at a given thermal neutralino relic abundance, this
implies larger indirect detection rates, as a result of an increase in the
fluxes of antimatter, gamma rays and neutrinos from the Sun orginating from
neutralino pair annihilations.
|
[
{
"created": "Thu, 28 Sep 2006 00:01:40 GMT",
"version": "v1"
},
{
"created": "Tue, 9 Jan 2007 10:14:07 GMT",
"version": "v2"
}
] |
2008-11-26
|
[
[
"Profumo",
"Stefano",
""
],
[
"Provenza",
"Alessio",
""
]
] |
We point out that if the lightest supersymmetric particle (LSP) is a Higgsino- or Wino-like neutralino, the net effect of coannihilations with sleptons is to increase the relic abundance, rather than producing the usual suppression, which takes place if the LSP is Bino-like. The reason for the enhancement lies in the effective thermally averaged cross section at freeze-out: sleptons annihilate (and co-annihilate) less efficiently than the neutralino(s)-chargino system, therefore slepton coannihilations effectively act as parasite degrees of freedom at freeze-out. Henceforth, the thermal relic abundance of LSP's corresponds to the cold Dark Matter abundance for smaller values of the LSP mass, and larger values of the neutralino pair annihilation cross section. In turn, at a given thermal neutralino relic abundance, this implies larger indirect detection rates, as a result of an increase in the fluxes of antimatter, gamma rays and neutrinos from the Sun orginating from neutralino pair annihilations.
|
hep-ph/9806451
|
Manuel Perez-Victoria
|
F. del Aguila, A. Culatti, R. Munoz-Tapia and M. Perez-Victoria
|
Techniques for one-loop calculations in constrained differential
renormalization
|
LaTex, 29 pages with 4 Postscript figures
|
Nucl.Phys. B537 (1999) 561-585
|
10.1016/S0550-3213(98)00645-2
|
MIT-CTP-2705, UG-FT-86/98
|
hep-ph hep-th
| null |
We describe in detail the constrained procedure of differential
renormalization and develop the techniques required for one-loop calculations.
As an illustration we renormalize Scalar QED and show that the two-, three- and
four-point Ward identities are automatically satisfied.
|
[
{
"created": "Tue, 23 Jun 1998 17:01:46 GMT",
"version": "v1"
}
] |
2015-06-25
|
[
[
"del Aguila",
"F.",
""
],
[
"Culatti",
"A.",
""
],
[
"Munoz-Tapia",
"R.",
""
],
[
"Perez-Victoria",
"M.",
""
]
] |
We describe in detail the constrained procedure of differential renormalization and develop the techniques required for one-loop calculations. As an illustration we renormalize Scalar QED and show that the two-, three- and four-point Ward identities are automatically satisfied.
|
hep-ph/9512352
|
V. Gribov
|
V.N. Gribov
|
Bound states of massless fermions as a source for new physics
|
9 pages, LaTex, 11 figures (pictex) in separate file. Opening lecture
given at the 33rd course of the International School of Subnuclear Physics,
Erice, Sicily (1995)
| null | null |
TK-95-35
|
hep-ph
| null |
The contribution of interactions at short and large distances to particle
masses is discussed in the framework of the standard model.
|
[
{
"created": "Tue, 19 Dec 1995 14:15:51 GMT",
"version": "v1"
}
] |
2007-05-23
|
[
[
"Gribov",
"V. N.",
""
]
] |
The contribution of interactions at short and large distances to particle masses is discussed in the framework of the standard model.
|
2108.11605
|
Wren Yamada
|
Wren A. Yamada, Osamu Morimatsu, Toru Sato and Koichi Yazaki
|
Near-threshold Spectrum from Uniformized Mittag-Leffler Expansion -Pole
Structure of $Z(3900)$-
|
13 pages, 7 pdf figures
| null |
10.1103/PhysRevD.105.014034
|
KEK-TH-2344, J-PARC-TH-0248, RIKEN-iTHEMS-Report-21
|
hep-ph nucl-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We demonstrate how S-matrix poles manifest themselves as the physical
spectrum near the upper threshold in the context of the two-channel uniformized
Mittag-Leffler expansion, an expression written as a sum of pole terms under an
appropriate variable where the S-matrix is made single-valued (uniformization).
We show that the transition of the spectrum is continuous as a S-matrix pole
moves across the boundaries of the complex energy Riemann sheets and that the
physical spectrum peaks at or near the upper threshold when the S-matrix pole
is positioned sufficiently close to it on the uniformized plane. There is no
essential difference on which sheet the pole is positioned. What is important
is the existence of a pole near the upper threshold and the distance between
the pole and the physical region, not on which complex energy sheet the pole is
positioned. We also point out that when the pole is close to the upper
threshold, the complex pole does not have the usual meaning of the resonance.
Neither the real part represents the peak energy, nor the imaginary part
represents the half width. Subsequently, we try to understand the current
status of $Z(3900)$ from the viewpoint of the uniformized Mittag-Leffler
expansion reflecting in particular, Phys.Rev.Lett.117, 242001 (2016) in which
they concluded that $Z(3900)$ is not a conventional resonance but a threshold
cusp. We point out that their results turn out to indicate the existence of
S-matrix poles near the $\bar D D^*$ threshold, which is most likely the origin
of the peak found in their calculation of the near-threshold spectrum. In order
to support our argument, we set up a separable potential model which shares
common behavior of poles near the $\bar D D^*$ threshold to the above-mentioned
reference and show in our model that the structures near the $\bar D D^*$
threshold are indeed caused by these near-threshold poles.
|
[
{
"created": "Thu, 26 Aug 2021 07:00:28 GMT",
"version": "v1"
}
] |
2022-02-09
|
[
[
"Yamada",
"Wren A.",
""
],
[
"Morimatsu",
"Osamu",
""
],
[
"Sato",
"Toru",
""
],
[
"Yazaki",
"Koichi",
""
]
] |
We demonstrate how S-matrix poles manifest themselves as the physical spectrum near the upper threshold in the context of the two-channel uniformized Mittag-Leffler expansion, an expression written as a sum of pole terms under an appropriate variable where the S-matrix is made single-valued (uniformization). We show that the transition of the spectrum is continuous as a S-matrix pole moves across the boundaries of the complex energy Riemann sheets and that the physical spectrum peaks at or near the upper threshold when the S-matrix pole is positioned sufficiently close to it on the uniformized plane. There is no essential difference on which sheet the pole is positioned. What is important is the existence of a pole near the upper threshold and the distance between the pole and the physical region, not on which complex energy sheet the pole is positioned. We also point out that when the pole is close to the upper threshold, the complex pole does not have the usual meaning of the resonance. Neither the real part represents the peak energy, nor the imaginary part represents the half width. Subsequently, we try to understand the current status of $Z(3900)$ from the viewpoint of the uniformized Mittag-Leffler expansion reflecting in particular, Phys.Rev.Lett.117, 242001 (2016) in which they concluded that $Z(3900)$ is not a conventional resonance but a threshold cusp. We point out that their results turn out to indicate the existence of S-matrix poles near the $\bar D D^*$ threshold, which is most likely the origin of the peak found in their calculation of the near-threshold spectrum. In order to support our argument, we set up a separable potential model which shares common behavior of poles near the $\bar D D^*$ threshold to the above-mentioned reference and show in our model that the structures near the $\bar D D^*$ threshold are indeed caused by these near-threshold poles.
|
hep-ph/0110181
|
Igor Ivanov
|
I.P.Ivanov (1 and 2), N.N.Nikolaev (1 and 3), I.F.Ginzburg (2) ((1)
IKP, Forschungszentrum Juelich, (2) Sobolev Institute of Mathematics,
Novosibirsk, Russia, (3) L. D. Landau Institute for Theoretical Physics,
Moscow, Russia)
|
Possible Odderon discovery at HERA via charge asymmetry in the
diffractive pi+pi- production
|
4 pages, To appear in Proceedings of the 9th International Workshop
on Deep Inelastic Scattering (DIS2001), Bologna, Italy, 27 Apr. - 1 May 2001
| null |
10.1142/9789812778345_0111
| null |
hep-ph
| null |
We discuss how the evasive Odderon signal can be enhanced by final state
interactions. We suggest the charge asymmetry of pion spectra in diffractive
pi+pi- photoproduction as a promising signature of the Odderon exchange.
|
[
{
"created": "Mon, 15 Oct 2001 09:04:23 GMT",
"version": "v1"
}
] |
2015-06-25
|
[
[
"Ivanov",
"I. P.",
"",
"1 and 2"
],
[
"Nikolaev",
"N. N.",
"",
"1 and 3"
],
[
"Ginzburg",
"I. F.",
""
]
] |
We discuss how the evasive Odderon signal can be enhanced by final state interactions. We suggest the charge asymmetry of pion spectra in diffractive pi+pi- photoproduction as a promising signature of the Odderon exchange.
|
1209.6318
|
Naoki Yamatsu
|
Naoki Yamatsu
|
New Mixing Structures of Chiral Generations in a Model with Noncompact
Horizontal Symmetry
|
22 pages, 7 figures
| null |
10.1093/ptep/pts079
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
New mixing structures between chiral generations of elementary particles at
low energy are shown in a vectorlike model with a horizontal symmetry SU(1,1).
In this framework the chiral model including odd number chiral generations is
realized via the spontaneous symmetry breaking of the horizontal symmetry. It
is shown that the Yukawa coupling matrices of chiral generations have naturally
hierarchical patterns, and in some cases the overall factors of their Yukawa
coupling matrices, e.g. the Yukawa coupling constants of the bottom quark and
tau lepton are naturally suppressed.
|
[
{
"created": "Thu, 27 Sep 2012 18:18:23 GMT",
"version": "v1"
}
] |
2016-06-21
|
[
[
"Yamatsu",
"Naoki",
""
]
] |
New mixing structures between chiral generations of elementary particles at low energy are shown in a vectorlike model with a horizontal symmetry SU(1,1). In this framework the chiral model including odd number chiral generations is realized via the spontaneous symmetry breaking of the horizontal symmetry. It is shown that the Yukawa coupling matrices of chiral generations have naturally hierarchical patterns, and in some cases the overall factors of their Yukawa coupling matrices, e.g. the Yukawa coupling constants of the bottom quark and tau lepton are naturally suppressed.
|
1012.4886
|
Hiroaki Sugiyama
|
Takeshi Fukuyama (Ritsumeikan U., Kusatsu & Kyoto sangyo U., Kyoto),
Hiroaki Sugiyama (Ritsumeikan U., Kusatsu), Koji Tsumura (Natl. Taiwan U.,
Taipei)
|
Phenomenology in the Zee Model with the A_4 Symmetry
|
26 pages, 4 figures, version accepted by PRD
|
Phys.Rev.D83:056016,2011
|
10.1103/PhysRevD.83.056016
|
MISC-2010-21
|
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
The Zee model generates neutrino masses at the one-loop level by adding
charged SU(2)_L-singlet and extra SU(2)_L-doublet scalars to the standard model
of particle physics. As the origin of the nontrivial structure of the lepton
flavor mixing, we introduce the softly broken A_4 symmetry to the Zee model.
This model is compatible with the tribimaximal mixing which agrees well with
neutrino oscillation measurements. Then, a sum rule m_1 e^{i alpha_12} + 2 m_2
+ 3 m_3 e^{i alpha_32} = 0 is obtained and it results in Delta m^2_31 < 0 and
m_3 > 1.8*10^{-2}eV. The effective mass |(M_nu)_{ee}| for the neutrinoless
double beta decay is predicted as | (M_\nu)_{ee} | > 1.7*10^{-2}eV. The
characteristic particles in this model are SU(2)_L-singlet charged Higgs bosons
s^+_alpha (alpha=xi,eta,zeta) which are made from a 3-representation of A_4.
Contributions of s^+_alpha to the lepton flavor violating decays of charged
leptons are almost forbidden by an approximately remaining Z_3 symmetry; only
BR(tau to ebar mu mu) can be sizable by the flavor changing neutral current
interaction with SU(2)_L-doublet scalars. Therefore, s^+_alpha can be easily
light enough to be discovered at the LHC with satisfying current constraints.
The flavor structures of BR(s^-_alpha to ell nu) are also discussed.
|
[
{
"created": "Wed, 22 Dec 2010 06:43:41 GMT",
"version": "v1"
},
{
"created": "Tue, 28 Dec 2010 07:42:55 GMT",
"version": "v2"
},
{
"created": "Wed, 6 Apr 2011 07:57:56 GMT",
"version": "v3"
}
] |
2015-03-17
|
[
[
"Fukuyama",
"Takeshi",
"",
"Ritsumeikan U., Kusatsu & Kyoto sangyo U., Kyoto"
],
[
"Sugiyama",
"Hiroaki",
"",
"Ritsumeikan U., Kusatsu"
],
[
"Tsumura",
"Koji",
"",
"Natl. Taiwan U.,\n Taipei"
]
] |
The Zee model generates neutrino masses at the one-loop level by adding charged SU(2)_L-singlet and extra SU(2)_L-doublet scalars to the standard model of particle physics. As the origin of the nontrivial structure of the lepton flavor mixing, we introduce the softly broken A_4 symmetry to the Zee model. This model is compatible with the tribimaximal mixing which agrees well with neutrino oscillation measurements. Then, a sum rule m_1 e^{i alpha_12} + 2 m_2 + 3 m_3 e^{i alpha_32} = 0 is obtained and it results in Delta m^2_31 < 0 and m_3 > 1.8*10^{-2}eV. The effective mass |(M_nu)_{ee}| for the neutrinoless double beta decay is predicted as | (M_\nu)_{ee} | > 1.7*10^{-2}eV. The characteristic particles in this model are SU(2)_L-singlet charged Higgs bosons s^+_alpha (alpha=xi,eta,zeta) which are made from a 3-representation of A_4. Contributions of s^+_alpha to the lepton flavor violating decays of charged leptons are almost forbidden by an approximately remaining Z_3 symmetry; only BR(tau to ebar mu mu) can be sizable by the flavor changing neutral current interaction with SU(2)_L-doublet scalars. Therefore, s^+_alpha can be easily light enough to be discovered at the LHC with satisfying current constraints. The flavor structures of BR(s^-_alpha to ell nu) are also discussed.
|
1006.2132
|
Zhong-Bo Kang
|
Zhong-Bo Kang (RIKEN BNL) and Dmitri E. Kharzeev (BNL)
|
Quark fragmentation in the $\theta$-vacuum
|
4 pages, 2 figures
|
Phys.Rev.Lett.106:042001,2011
|
10.1103/PhysRevLett.106.042001
| null |
hep-ph nucl-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
The vacuum of Quantum Chromodynamics is a superposition of degenerate states
with different topological numbers that are connected by tunneling (the
$\theta$-vacuum). The tunneling events are due to topologically non-trivial
configurations of gauge fields (e.g. the instantons) that induce local $\p$-odd
domains in Minkowski space-time. We study the quark fragmentation in this
topologically non-trivial QCD background. We find that even though QCD globally
conserves $\p$ and $\cp$ symmetries, two new kinds of $\p$-odd fragmentation
functions emerge. They generate interesting dihadron correlations: one is the
azimuthal angle correlation $\sim \cos(\phi_1 + \phi_2)$ usually referred to as
the Collins effect, and the other is the $\p$-odd correlation $\sim \sin(\phi_1
+ \phi_2)$ that vanishes in the cross section summed over many events, but
survives on the event-by-event basis. Using the chiral quark model we estimate
the magnitude of these new fragmentation functions. We study their experimental
manifestations in dihadron production in $e^+e^-$ collisions, and comment on
the applicability of our approach in deep-inelastic scattering, proton-proton
and heavy ion collisions.
|
[
{
"created": "Thu, 10 Jun 2010 19:55:52 GMT",
"version": "v1"
}
] |
2011-02-01
|
[
[
"Kang",
"Zhong-Bo",
"",
"RIKEN BNL"
],
[
"Kharzeev",
"Dmitri E.",
"",
"BNL"
]
] |
The vacuum of Quantum Chromodynamics is a superposition of degenerate states with different topological numbers that are connected by tunneling (the $\theta$-vacuum). The tunneling events are due to topologically non-trivial configurations of gauge fields (e.g. the instantons) that induce local $\p$-odd domains in Minkowski space-time. We study the quark fragmentation in this topologically non-trivial QCD background. We find that even though QCD globally conserves $\p$ and $\cp$ symmetries, two new kinds of $\p$-odd fragmentation functions emerge. They generate interesting dihadron correlations: one is the azimuthal angle correlation $\sim \cos(\phi_1 + \phi_2)$ usually referred to as the Collins effect, and the other is the $\p$-odd correlation $\sim \sin(\phi_1 + \phi_2)$ that vanishes in the cross section summed over many events, but survives on the event-by-event basis. Using the chiral quark model we estimate the magnitude of these new fragmentation functions. We study their experimental manifestations in dihadron production in $e^+e^-$ collisions, and comment on the applicability of our approach in deep-inelastic scattering, proton-proton and heavy ion collisions.
|
0906.1072
|
Michael R. Pennington
|
M.R. Pennington
|
Hadronic structure from two photon collisions
|
3 pages, 3 figures Invited talk at the Workshop on Physics with
KLOE2, LNF, Frascati, April 9-10, 2009
| null | null |
IPPP/09/45,DCPT/09/90
|
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We briefly describe what a two photon capability with KLOE2 can measure and
discuss what this will teach us about the world of light hadrons.
|
[
{
"created": "Fri, 5 Jun 2009 09:30:02 GMT",
"version": "v1"
}
] |
2009-06-08
|
[
[
"Pennington",
"M. R.",
""
]
] |
We briefly describe what a two photon capability with KLOE2 can measure and discuss what this will teach us about the world of light hadrons.
|
1512.06819
|
Nathaniel Craig
|
Nathaniel Craig
|
Implications of SUSY Searches for Physics Beyond the Standard Model
|
8 pages, 3 figures; plenary talk presented at XXVIIth Rencontres de
Blois, France, 31 May - 5 June 2015
| null | null | null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
I discuss some essential features of the electroweak hierarchy problem and
the ensuing motivation for weak-scale supersymmetry. Taking the hierarchy
problem seriously, null results in searches for SUSY at the LHC favor specific
regions of SUSY parameter space. More broadly, they suggest investigating a
variety of alternative approaches to the hierarchy problem with diverse
experimental signatures.
|
[
{
"created": "Mon, 21 Dec 2015 20:45:02 GMT",
"version": "v1"
}
] |
2015-12-22
|
[
[
"Craig",
"Nathaniel",
""
]
] |
I discuss some essential features of the electroweak hierarchy problem and the ensuing motivation for weak-scale supersymmetry. Taking the hierarchy problem seriously, null results in searches for SUSY at the LHC favor specific regions of SUSY parameter space. More broadly, they suggest investigating a variety of alternative approaches to the hierarchy problem with diverse experimental signatures.
|
2011.04807
|
Igor Anikin
|
I.V. Anikin
|
On $\xi$-process for DVCS-amplitude
|
7 pages, 3 figures; a few typos are fixed
|
Symmetry 2020, 12(12), 1996;
|
10.3390/sym12121996
| null |
hep-ph
|
http://creativecommons.org/licenses/by/4.0/
|
In this note, we demonstrate in detail the $\xi$-process implementation
applied to the deeply virtual Compton scattering amplitude to ensure both the
QCD and QED gauge invariance. The presented details are also important for
understanding of the contour gauge used in different processes.
|
[
{
"created": "Mon, 9 Nov 2020 22:15:16 GMT",
"version": "v1"
},
{
"created": "Wed, 2 Dec 2020 21:17:27 GMT",
"version": "v2"
}
] |
2020-12-29
|
[
[
"Anikin",
"I. V.",
""
]
] |
In this note, we demonstrate in detail the $\xi$-process implementation applied to the deeply virtual Compton scattering amplitude to ensure both the QCD and QED gauge invariance. The presented details are also important for understanding of the contour gauge used in different processes.
|
hep-ph/0611102
|
Alan D. Martin
|
K. Hagiwara, A.D. Martin, Daisuke Nomura and T. Teubner
|
Improved predictions for g-2 of the muon and \alpha_{\rm QED}(M_Z^2)
|
12 pages, 5 figures. Version to be published in Phys. Lett. B
|
Phys.Lett.B649:173-179,2007
|
10.1016/j.physletb.2007.04.012
|
KEK-TH-1112, IPPP/06/72, DCPT/06/144, LTH 729
|
hep-ph
| null |
We update the Standard Model predictions of the anomalous magnetic moment of
the muon, a_\mu = (g-2)/2, and the value of the QED coupling at the Z-boson
mass, incorporating the new e^+e^- \to \pi\pi data obtained by CMD-2 and KLOE,
as well as the corrected SND data, and other improvements. The prediction for
a_\mu=11659180.4 (5.1) \times 10^{-10} is about 3 \times 10^{-10} lower than
before, and has a smaller uncertainty, which corresponds to a 3.4\sigma
deviation from the measured value. The prediction for the QED coupling is
\alpha(M_Z^2)^{-1}= 128.937 \pm 0.030.
|
[
{
"created": "Wed, 8 Nov 2006 17:35:35 GMT",
"version": "v1"
},
{
"created": "Fri, 6 Apr 2007 14:13:09 GMT",
"version": "v2"
},
{
"created": "Fri, 20 Apr 2007 14:07:31 GMT",
"version": "v3"
}
] |
2008-11-26
|
[
[
"Hagiwara",
"K.",
""
],
[
"Martin",
"A. D.",
""
],
[
"Nomura",
"Daisuke",
""
],
[
"Teubner",
"T.",
""
]
] |
We update the Standard Model predictions of the anomalous magnetic moment of the muon, a_\mu = (g-2)/2, and the value of the QED coupling at the Z-boson mass, incorporating the new e^+e^- \to \pi\pi data obtained by CMD-2 and KLOE, as well as the corrected SND data, and other improvements. The prediction for a_\mu=11659180.4 (5.1) \times 10^{-10} is about 3 \times 10^{-10} lower than before, and has a smaller uncertainty, which corresponds to a 3.4\sigma deviation from the measured value. The prediction for the QED coupling is \alpha(M_Z^2)^{-1}= 128.937 \pm 0.030.
|
1402.5470
|
Ailin Zhang
|
Li-Jin Chen, Dan-Dan Ye and Ailin Zhang
|
Is $Y(4008)$ possibly a $1^{--}$ $\psi(3^3S_1)$ state?
|
6 pages, 3 figures, 6 tables, RevTex
| null |
10.1140/epjc/s10052-014-3031-z
| null |
hep-ph hep-ex
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
The strong decays of the radially excited $\psi(3^3S_1)$ state are studied
within the $^3P_0$ model. As a believed $\psi(3^3S_1)$, some strong decay
widths and relevant ratios of $\psi(4040)$ are calculated in the model. The
theoretical results are consistent with experiments. In a similar way, as a
possible $\psi(3^3S_1)$, the same strong decay widths and relevant ratios of
$Y(4008)$ are presented. Our study indicates that $Y(4008)$ is hard to be
identified with a $\psi(3^3S_1)$ charmonium once it is confirmed under the
$D^*\bar{D}^*$ threshold, but it is very possibly a $\psi(3^3S_1)$ charmonium
once it is confirmed above the $D^*\bar{D}^*$ threshold by experiment.
|
[
{
"created": "Sat, 22 Feb 2014 03:19:12 GMT",
"version": "v1"
}
] |
2015-06-18
|
[
[
"Chen",
"Li-Jin",
""
],
[
"Ye",
"Dan-Dan",
""
],
[
"Zhang",
"Ailin",
""
]
] |
The strong decays of the radially excited $\psi(3^3S_1)$ state are studied within the $^3P_0$ model. As a believed $\psi(3^3S_1)$, some strong decay widths and relevant ratios of $\psi(4040)$ are calculated in the model. The theoretical results are consistent with experiments. In a similar way, as a possible $\psi(3^3S_1)$, the same strong decay widths and relevant ratios of $Y(4008)$ are presented. Our study indicates that $Y(4008)$ is hard to be identified with a $\psi(3^3S_1)$ charmonium once it is confirmed under the $D^*\bar{D}^*$ threshold, but it is very possibly a $\psi(3^3S_1)$ charmonium once it is confirmed above the $D^*\bar{D}^*$ threshold by experiment.
|
2211.13030
|
Tom Tong
|
Ashutosh Kotwal, Joaquim Matias, Andrea Mauri, Tom Tong, Lukas
Varnhorst
|
Round table on Standard Model Anomalies
|
Proceedings of the XVth Quark Confinement and the Hadron Spectrum
conference, August 1st - 6th, 2022, University of Stavanger, Norway
| null |
10.1051/epjconf/202227401006
| null |
hep-ph hep-ex hep-lat
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
This contribution to the XVth Quark Confinement and the Hadron Spectrum
conference covers a description, both theoretical and experimental, of the
present status of a set of very different anomalies. The discussion ranges from
the long standing $b \to sll$ anomalies, $(g-2)$ and the new $M_W$ anomaly.
|
[
{
"created": "Wed, 23 Nov 2022 15:31:58 GMT",
"version": "v1"
},
{
"created": "Sun, 11 Dec 2022 22:02:08 GMT",
"version": "v2"
}
] |
2023-01-11
|
[
[
"Kotwal",
"Ashutosh",
""
],
[
"Matias",
"Joaquim",
""
],
[
"Mauri",
"Andrea",
""
],
[
"Tong",
"Tom",
""
],
[
"Varnhorst",
"Lukas",
""
]
] |
This contribution to the XVth Quark Confinement and the Hadron Spectrum conference covers a description, both theoretical and experimental, of the present status of a set of very different anomalies. The discussion ranges from the long standing $b \to sll$ anomalies, $(g-2)$ and the new $M_W$ anomaly.
|
1308.4297
|
Palash Baran Pal
|
Gautam Bhattacharyya, Dipankar Das, Palash B. Pal, M. N. Rebelo
|
Scalar sector properties of two-Higgs-doublet models with a global U(1)
symmetry
|
12 pages, 15 eps figure files; minor modifications made and a few
references added
|
JHEP 1310 (2013) 081
|
10.1007/JHEP10(2013)081
|
SINP/TNP/2013/12
|
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We analyze the scalar sector properties of a general class of
two-Higgs-doublet models which has a global U(1) symmetry in the quartic terms.
We find constraints on the parameters of the potential from the considerations
of unitarity of scattering amplitudes, the global stability of the potential
and the $\rho$-parameter. We concentrate on the spectrum of the non-standard
scalar masses in the decoupling limit which is preferred by the Higgs data at
the LHC. We exhibit charged-Higgs induced contributions to the diphoton decay
width of the 125\,GeV Higgs boson and its correlation with the corresponding
$Z\gamma$ width.
|
[
{
"created": "Tue, 20 Aug 2013 13:14:13 GMT",
"version": "v1"
},
{
"created": "Fri, 20 Sep 2013 06:58:59 GMT",
"version": "v2"
}
] |
2013-10-23
|
[
[
"Bhattacharyya",
"Gautam",
""
],
[
"Das",
"Dipankar",
""
],
[
"Pal",
"Palash B.",
""
],
[
"Rebelo",
"M. N.",
""
]
] |
We analyze the scalar sector properties of a general class of two-Higgs-doublet models which has a global U(1) symmetry in the quartic terms. We find constraints on the parameters of the potential from the considerations of unitarity of scattering amplitudes, the global stability of the potential and the $\rho$-parameter. We concentrate on the spectrum of the non-standard scalar masses in the decoupling limit which is preferred by the Higgs data at the LHC. We exhibit charged-Higgs induced contributions to the diphoton decay width of the 125\,GeV Higgs boson and its correlation with the corresponding $Z\gamma$ width.
|
1701.08019
|
Yi Liao
|
Yi Liao, Xiao-Dong Ma
|
Perturbative Power Counting, Lowest-Index Operators and Their
Renormalization in Standard Model Effective Field Theory
|
7 pages, 2 figures, 2 tables; v2: added a few refs and one sentence,
without other changes; v3: minor rewording, published version
|
Commun. Theor. Phys. 69 (2018) 285
|
10.1088/0253-6102/69/3/285
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We study two aspects of higher dimensional operators in standard model
effective field theory. We first introduce a perturbative power counting rule
for the entries in the anomalous dimension matrix of operators with equal mass
dimension. The power counting is determined by the number of loops and the
difference of the indices of the two operators involved, which in turn is
defined by assuming that all terms in the standard model Lagrangian have an
equal perturbative power. Then we show that the operators with the lowest index
are unique at each mass dimension $d$, i.e., $(H^\dagger H)^{d/2}$ for even
$d\geq 4$, and $(L^T\epsilon H)C(L^T\epsilon H)^T(H^\dagger H)^{(d-5)/2}$ for
odd $d\geq 5$. Here $H,~L$ are the Higgs and lepton doublet, and $\epsilon,~C$
the antisymmetric matrix of rank two and the charge conjugation matrix,
respectively. The renormalization group running of these operators can be
studied separately from other operators of equal mass dimension at the leading
order in power counting. We compute their anomalous dimensions at one loop for
general $d$ and find that they are enhanced quadratically in $d$ due to
combinatorics. We also make connections with classification of operators in
terms of their holomorphic and anti-holomorphic weights.
|
[
{
"created": "Fri, 27 Jan 2017 11:33:53 GMT",
"version": "v1"
},
{
"created": "Fri, 10 Feb 2017 08:58:44 GMT",
"version": "v2"
},
{
"created": "Mon, 5 Mar 2018 14:20:49 GMT",
"version": "v3"
}
] |
2018-04-04
|
[
[
"Liao",
"Yi",
""
],
[
"Ma",
"Xiao-Dong",
""
]
] |
We study two aspects of higher dimensional operators in standard model effective field theory. We first introduce a perturbative power counting rule for the entries in the anomalous dimension matrix of operators with equal mass dimension. The power counting is determined by the number of loops and the difference of the indices of the two operators involved, which in turn is defined by assuming that all terms in the standard model Lagrangian have an equal perturbative power. Then we show that the operators with the lowest index are unique at each mass dimension $d$, i.e., $(H^\dagger H)^{d/2}$ for even $d\geq 4$, and $(L^T\epsilon H)C(L^T\epsilon H)^T(H^\dagger H)^{(d-5)/2}$ for odd $d\geq 5$. Here $H,~L$ are the Higgs and lepton doublet, and $\epsilon,~C$ the antisymmetric matrix of rank two and the charge conjugation matrix, respectively. The renormalization group running of these operators can be studied separately from other operators of equal mass dimension at the leading order in power counting. We compute their anomalous dimensions at one loop for general $d$ and find that they are enhanced quadratically in $d$ due to combinatorics. We also make connections with classification of operators in terms of their holomorphic and anti-holomorphic weights.
|
1204.3499
|
Ryosuke Sato
|
Masahiro Ibe and Ryosuke Sato
|
A 125 GeV Higgs Boson Mass and Gravitino Dark Matter in R-invariant
Direct Gauge Mediation
|
15 pages, 6 figures; v2: section 5 added (version accepted for the
publication of PLB)
| null |
10.1016/j.physletb.2012.09.018
|
ICRR-Report-613-2012-2; IPMU-12-0035; UT-12-08
|
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We discuss the SM-like Higgs boson mass in the MSSM in an R-invariant direct
gauge mediation model with the gravitino mass in the O(1) keV range. The
gravitino dark matter scenario in this mass range is a good candidate for a
slightly warm dark matter. We show that the Higgs boson mass around 125 GeV
suggested by the ATLAS and CMS experiments can be easily achieved in the direct
gauge mediation model with this gravitino mass range.
|
[
{
"created": "Mon, 16 Apr 2012 14:33:23 GMT",
"version": "v1"
},
{
"created": "Thu, 20 Sep 2012 16:45:35 GMT",
"version": "v2"
}
] |
2015-06-04
|
[
[
"Ibe",
"Masahiro",
""
],
[
"Sato",
"Ryosuke",
""
]
] |
We discuss the SM-like Higgs boson mass in the MSSM in an R-invariant direct gauge mediation model with the gravitino mass in the O(1) keV range. The gravitino dark matter scenario in this mass range is a good candidate for a slightly warm dark matter. We show that the Higgs boson mass around 125 GeV suggested by the ATLAS and CMS experiments can be easily achieved in the direct gauge mediation model with this gravitino mass range.
|
hep-ph/9403289
|
Jutta Kunz
|
Burkhard Kleihaus and Jutta Kunz
|
Multisphalerons in the Weak Interactions
|
10 pages, latex, 8 figures in uuencoded postscript files. THU-94/04
|
Phys.Lett. B329 (1994) 61-67
|
10.1016/0370-2693(94)90517-7
| null |
hep-ph
| null |
We construct multisphaleron solutions in the weak interactions. The
multisphaleron solutions carry Chern-Simons charge $n/2$, where $n$ is an
integer. The well-known sphaleron has $n=1$ and is spherically symmetric for
vanishing mixing angle. In contrast the multisphalerons with $n>1$ are only
axially symmetric, even for vanishing mixing angle. The greater $n$, the
stronger the energy density deforms. While for small Higgs masses the energy of
the multisphalerons is smaller than $n$ times the energy of the sphaleron, the
energy of the multisphalerons is larger than $n$ times the energy of the
sphaleron for large Higgs masses.
|
[
{
"created": "Tue, 15 Mar 1994 10:30:44 GMT",
"version": "v1"
}
] |
2009-10-28
|
[
[
"Kleihaus",
"Burkhard",
""
],
[
"Kunz",
"Jutta",
""
]
] |
We construct multisphaleron solutions in the weak interactions. The multisphaleron solutions carry Chern-Simons charge $n/2$, where $n$ is an integer. The well-known sphaleron has $n=1$ and is spherically symmetric for vanishing mixing angle. In contrast the multisphalerons with $n>1$ are only axially symmetric, even for vanishing mixing angle. The greater $n$, the stronger the energy density deforms. While for small Higgs masses the energy of the multisphalerons is smaller than $n$ times the energy of the sphaleron, the energy of the multisphalerons is larger than $n$ times the energy of the sphaleron for large Higgs masses.
|
2011.07799
|
Xing-Dao Guo
|
Jian-Wen Zhu, Xing-Dao Guo, Ren-You Zhang, Wen-Gan Ma, and Xue-Qian Li
|
A possible interpretation for $X(6900)$ observed in four-muon final
state by LHCb -- A light Higgs-like boson?
|
5 figures
| null | null | null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
A peak structure of $J/\psi$ pair production around $6.9~{\rm GeV}$ was
observed and analyzed by the LHCb collaboration using the Run I and II data of
LHC. How to understand this peak arouses enthusiastic discussions among both
theorists and experimentalists of high energy physics, because this discovery
might hint something new. Overwhelming works on this topic tend to attribute
the peak as a four-quark state: tetraquark or molecule. Instead, we suggest
that this peak is corresponding to a fundamental Higgs-like boson with mass
about $6.9~{\rm GeV}$ which is advocated by a BSM effective theory. We present
a detailed analysis on both signal and SM background, including integrated
cross sections and invariant mass distributions of the final-state $J/\psi$
pair. Our numerical results are well in coincidence with the experimental data,
as postulating the resonance observed by LHCb to be a BSM $0^{++}$ scalar.
Therefore, the peak at $M_{\text{di-}J/\psi} \sim 6.9~{\rm GeV}$ might be a
hint of new physics beyond the SM whose scale is not as large as mostly
expected by high energy physicists. More further works are urgently needed in
both experimental and theoretical aspects to validate or negate this
assumption.
|
[
{
"created": "Mon, 16 Nov 2020 09:00:57 GMT",
"version": "v1"
}
] |
2020-11-17
|
[
[
"Zhu",
"Jian-Wen",
""
],
[
"Guo",
"Xing-Dao",
""
],
[
"Zhang",
"Ren-You",
""
],
[
"Ma",
"Wen-Gan",
""
],
[
"Li",
"Xue-Qian",
""
]
] |
A peak structure of $J/\psi$ pair production around $6.9~{\rm GeV}$ was observed and analyzed by the LHCb collaboration using the Run I and II data of LHC. How to understand this peak arouses enthusiastic discussions among both theorists and experimentalists of high energy physics, because this discovery might hint something new. Overwhelming works on this topic tend to attribute the peak as a four-quark state: tetraquark or molecule. Instead, we suggest that this peak is corresponding to a fundamental Higgs-like boson with mass about $6.9~{\rm GeV}$ which is advocated by a BSM effective theory. We present a detailed analysis on both signal and SM background, including integrated cross sections and invariant mass distributions of the final-state $J/\psi$ pair. Our numerical results are well in coincidence with the experimental data, as postulating the resonance observed by LHCb to be a BSM $0^{++}$ scalar. Therefore, the peak at $M_{\text{di-}J/\psi} \sim 6.9~{\rm GeV}$ might be a hint of new physics beyond the SM whose scale is not as large as mostly expected by high energy physicists. More further works are urgently needed in both experimental and theoretical aspects to validate or negate this assumption.
|
1604.06800
|
Tongyan Lin
|
Yonit Hochberg, Tongyan Lin, Kathryn M. Zurek
|
Detecting Ultralight Bosonic Dark Matter via Absorption in
Superconductors
|
10 pages, 5 figures
|
Phys. Rev. D 94, 015019 (2016)
|
10.1103/PhysRevD.94.015019
| null |
hep-ph astro-ph.CO hep-ex
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Superconducting targets have recently been proposed for the direct detection
of dark matter as light as a keV, via elastic scattering off conduction
electrons in Cooper pairs. Detecting such light dark matter requires
sensitivity to energies as small as the superconducting gap of O(meV). Here we
show that these same superconducting devices can detect much lighter DM, of meV
to eV mass, via dark matter absorption on a conduction electron, followed by
emission of an athermal phonon. We demonstrate the power of this setup for
relic kinetically mixed hidden photons, pseudoscalars, and scalars, showing the
reach can exceed current astrophysical and terrestrial constraints with only a
moderate exposure.
|
[
{
"created": "Fri, 22 Apr 2016 20:00:01 GMT",
"version": "v1"
}
] |
2016-07-27
|
[
[
"Hochberg",
"Yonit",
""
],
[
"Lin",
"Tongyan",
""
],
[
"Zurek",
"Kathryn M.",
""
]
] |
Superconducting targets have recently been proposed for the direct detection of dark matter as light as a keV, via elastic scattering off conduction electrons in Cooper pairs. Detecting such light dark matter requires sensitivity to energies as small as the superconducting gap of O(meV). Here we show that these same superconducting devices can detect much lighter DM, of meV to eV mass, via dark matter absorption on a conduction electron, followed by emission of an athermal phonon. We demonstrate the power of this setup for relic kinetically mixed hidden photons, pseudoscalars, and scalars, showing the reach can exceed current astrophysical and terrestrial constraints with only a moderate exposure.
|
hep-ph/9809413
|
Avtandil Tkabladze
|
Wolf-Dieter Nowak and Avto Tkabladze (DESY, Zeuthen)
|
Double Spin Asymmetries in P-wave Charmonium Hadroproduction
|
10 pages, LaTeX, with 5 eps figs included with epsfig.sty
|
Phys.Lett. B443 (1998) 379-386
|
10.1016/S0370-2693(98)01289-1
|
DESY 98-139
|
hep-ph
| null |
We discuss the double spin asymmetries in P-wave charmonium hadroproduction
with non-zero transverse momenta at fixed target energies, $\sqrt{s}\simeq40$
GeV, within the framework of the NRQCD factorization approach. The size of the
asymmetries and the projected statistical errors in a future option of HERA
with longitudinally polarized protons scattering off a polarized target
(HERA-$\vec N$) are calculated. Measurements of the $\chi_{c1}$ and $\chi_{c2}$
decays into dilepton plus photon should allow to distinguish between different
parametrizations for the polarized gluon distribution in the proton. At higher
energies ($\sqrt{s}=200$ GeV) the situation appears less favourable with the
presently envisaged integrated luminosities of the polarized RHIC collider.
|
[
{
"created": "Wed, 16 Sep 1998 14:37:15 GMT",
"version": "v1"
}
] |
2009-10-31
|
[
[
"Nowak",
"Wolf-Dieter",
"",
"DESY, Zeuthen"
],
[
"Tkabladze",
"Avto",
"",
"DESY, Zeuthen"
]
] |
We discuss the double spin asymmetries in P-wave charmonium hadroproduction with non-zero transverse momenta at fixed target energies, $\sqrt{s}\simeq40$ GeV, within the framework of the NRQCD factorization approach. The size of the asymmetries and the projected statistical errors in a future option of HERA with longitudinally polarized protons scattering off a polarized target (HERA-$\vec N$) are calculated. Measurements of the $\chi_{c1}$ and $\chi_{c2}$ decays into dilepton plus photon should allow to distinguish between different parametrizations for the polarized gluon distribution in the proton. At higher energies ($\sqrt{s}=200$ GeV) the situation appears less favourable with the presently envisaged integrated luminosities of the polarized RHIC collider.
|
2112.09111
|
Alessandro Strumia
|
Alessandro Strumia
|
Dark Matter interpretation of the neutron decay anomaly
|
15 pages, 3 figures. Published version. Associated webinar:
https://youtu.be/Q1bUrpQqTQs
| null |
10.1007/JHEP02(2022)067
| null |
hep-ph astro-ph.HE hep-ex
|
http://creativecommons.org/licenses/by/4.0/
|
We add to the Standard Model a new fermion $\chi$ with minimal baryon number
1/3. Neutron decay $n \to \chi\chi\chi$ into non-relativistic $\chi$ can
account for the neutron decay anomaly, compatibly with bounds from neutron
stars. $\chi$ can be Dark Matter, and its cosmological abundance can be
generated by freeze-in dominated at $T \sim m_n$. The associated processes $n
\to \chi\chi\chi \gamma$, hydrogen decay ${\rm H}\to \chi\chi \chi\nu(\gamma)$
and DM-induced neutron disappearance $\bar\chi n \to \chi \chi (\gamma)$ have
rates below experimental bounds and can be of interest for future experiments.
|
[
{
"created": "Thu, 16 Dec 2021 18:51:01 GMT",
"version": "v1"
},
{
"created": "Fri, 18 Mar 2022 16:07:01 GMT",
"version": "v2"
}
] |
2022-03-21
|
[
[
"Strumia",
"Alessandro",
""
]
] |
We add to the Standard Model a new fermion $\chi$ with minimal baryon number 1/3. Neutron decay $n \to \chi\chi\chi$ into non-relativistic $\chi$ can account for the neutron decay anomaly, compatibly with bounds from neutron stars. $\chi$ can be Dark Matter, and its cosmological abundance can be generated by freeze-in dominated at $T \sim m_n$. The associated processes $n \to \chi\chi\chi \gamma$, hydrogen decay ${\rm H}\to \chi\chi \chi\nu(\gamma)$ and DM-induced neutron disappearance $\bar\chi n \to \chi \chi (\gamma)$ have rates below experimental bounds and can be of interest for future experiments.
|
hep-ph/9510306
|
Daniel Ng
|
Daniel Ng and John N. Ng
|
A note on Majorana neutrinos, leptonic CKM and electron electric dipole
moment
|
7 pages and 1 figure
|
Mod.Phys.Lett.A11:211-216,1996
|
10.1142/S0217732396000254
|
TRI-PP-95-69
|
hep-ph
| null |
The electric dipole moment of the electron, $d_e$, is known to vanish up to
thre e-loops in the standard model with massless neutrinos. However, if
neutrinos are massive Majorana particles, we obtain the result that $d_e$
induced by leptonic CKM mechanism is non-vanishing at two-loop order, and it
applies to all massive Majorana neutrino models.
|
[
{
"created": "Mon, 16 Oct 1995 19:07:14 GMT",
"version": "v1"
}
] |
2014-11-17
|
[
[
"Ng",
"Daniel",
""
],
[
"Ng",
"John N.",
""
]
] |
The electric dipole moment of the electron, $d_e$, is known to vanish up to thre e-loops in the standard model with massless neutrinos. However, if neutrinos are massive Majorana particles, we obtain the result that $d_e$ induced by leptonic CKM mechanism is non-vanishing at two-loop order, and it applies to all massive Majorana neutrino models.
|
1910.09431
|
Zhao-Huan Yu
|
Yu-Pan Zeng, Chengfeng Cai, Dan-Yang Liu, Zhao-Huan Yu, Hong-Hao Zhang
|
Probing quadruplet scalar dark matter at current and future $pp$
colliders
|
29 pages, 9 figures; revisions to match the published version
|
Phys. Rev. D 101, 115033 (2020)
|
10.1103/PhysRevD.101.115033
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We investigate a dark matter model involving an inert
$\mathrm{SU}(2)_\mathrm{L}$ quadruplet scalar with hypercharge 1/2. After the
electroweak symmetry breaking, the dark sector contains one doubly charged, two
singly charged, and two neutral scalars. The lighter neutral scalar can be a
viable dark matter candidate. Electroweak production of these scalars at the
Large Hadron Collider leads to potential signals in the $\text{monojet} +
/\!\!\!\!E_\mathrm{T}$ and $\text{soft-leptons} + \text{jets} +
/\!\!\!\!E_\mathrm{T}$ channels. We thus derive constraints on the model by
reinterpreting recent experimental searches. Based on simulation, we further
evaluate the sensitivity at a future 100 TeV $pp$ collider.
|
[
{
"created": "Mon, 21 Oct 2019 15:07:03 GMT",
"version": "v1"
},
{
"created": "Fri, 25 Oct 2019 09:56:40 GMT",
"version": "v2"
},
{
"created": "Thu, 25 Jun 2020 03:41:08 GMT",
"version": "v3"
}
] |
2020-06-26
|
[
[
"Zeng",
"Yu-Pan",
""
],
[
"Cai",
"Chengfeng",
""
],
[
"Liu",
"Dan-Yang",
""
],
[
"Yu",
"Zhao-Huan",
""
],
[
"Zhang",
"Hong-Hao",
""
]
] |
We investigate a dark matter model involving an inert $\mathrm{SU}(2)_\mathrm{L}$ quadruplet scalar with hypercharge 1/2. After the electroweak symmetry breaking, the dark sector contains one doubly charged, two singly charged, and two neutral scalars. The lighter neutral scalar can be a viable dark matter candidate. Electroweak production of these scalars at the Large Hadron Collider leads to potential signals in the $\text{monojet} + /\!\!\!\!E_\mathrm{T}$ and $\text{soft-leptons} + \text{jets} + /\!\!\!\!E_\mathrm{T}$ channels. We thus derive constraints on the model by reinterpreting recent experimental searches. Based on simulation, we further evaluate the sensitivity at a future 100 TeV $pp$ collider.
|
hep-ph/0209003
|
Keith OIive
|
D. A. Demir, Tony Gherghetta, and Keith A. Olive
|
Preserving the Lepton Asymmetry in the Brane World
|
13 pages, latex, 2 eps figure clarifications and reference added
|
Phys.Lett.B549:194-203,2002
|
10.1016/S0370-2693(02)02902-7
|
UMN-TH-2110/02, TPI-MINN-02/39
|
hep-ph
| null |
In models where the Standard Model spectrum is localized on a brane embedded
in a higher dimensional spacetime, we discuss the lepton number violation
induced by the emission of right-handed neutrinos from the brane. We show that
quite generically the presence of the right-handed neutrinos in the bulk leads
to rapid lepton number violating processes which above the electroweak scale
would wash away any prior lepton or baryon asymmetry. In order to preserve the
lepton asymmetry, the brane-bulk couplings for at least one lepton flavor must
be extremely suppressed. We show that this has a natural interpretation in the
brane world.
|
[
{
"created": "Fri, 30 Aug 2002 23:30:01 GMT",
"version": "v1"
},
{
"created": "Mon, 9 Sep 2002 20:14:26 GMT",
"version": "v2"
}
] |
2009-09-15
|
[
[
"Demir",
"D. A.",
""
],
[
"Gherghetta",
"Tony",
""
],
[
"Olive",
"Keith A.",
""
]
] |
In models where the Standard Model spectrum is localized on a brane embedded in a higher dimensional spacetime, we discuss the lepton number violation induced by the emission of right-handed neutrinos from the brane. We show that quite generically the presence of the right-handed neutrinos in the bulk leads to rapid lepton number violating processes which above the electroweak scale would wash away any prior lepton or baryon asymmetry. In order to preserve the lepton asymmetry, the brane-bulk couplings for at least one lepton flavor must be extremely suppressed. We show that this has a natural interpretation in the brane world.
|
hep-ph/0308103
|
Mayda M. Velasco
|
David Asner, Stephen Asztalos, Albert De Roeck, Sven Heinemeyer, Jeff
Gronberg, John F. Gunion, Heather E. Logan, Victoria Martin, Michal Szleper,
Mayda M. Velasco
|
Complementarity of a Low Energy Photon Collider and LHC Physics
|
29 pages, 37 figure, LP-2003
| null | null |
nuhep-exp/03-003, uCD-03-08
|
hep-ph
| null |
We discuss the complementarity between the LHC and a low energy photon
collider. We mostly consider the scenario, where the first linear collider is a
photon collider based on dual beam technology like CLIC.
|
[
{
"created": "Sat, 9 Aug 2003 01:57:35 GMT",
"version": "v1"
}
] |
2009-09-29
|
[
[
"Asner",
"David",
""
],
[
"Asztalos",
"Stephen",
""
],
[
"De Roeck",
"Albert",
""
],
[
"Heinemeyer",
"Sven",
""
],
[
"Gronberg",
"Jeff",
""
],
[
"Gunion",
"John F.",
""
],
[
"Logan",
"Heather E.",
""
],
[
"Martin",
"Victoria",
""
],
[
"Szleper",
"Michal",
""
],
[
"Velasco",
"Mayda M.",
""
]
] |
We discuss the complementarity between the LHC and a low energy photon collider. We mostly consider the scenario, where the first linear collider is a photon collider based on dual beam technology like CLIC.
|
1207.4609
|
Samuel Wallon
|
T. Altinoluk, B. Pire, L. Szymanowski, S. Wallon
|
Resumming soft and collinear contributions in deeply virtual Compton
scattering
|
14 figures
| null |
10.1007/JHEP10(2012)049
|
CPHT-RR066.0712; LPT-ORSAY-12-82
|
hep-ph nucl-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We calculate the quark coefficient function Tq(x,xi) that enters the
factorized amplitude for deeply virtual Compton scattering (DVCS) at all order
in a soft and collinear gluon approximation, focusing on the leading double
logarithmic behavior in x +/- xi, where x +/- xi is the light cone momentum
fraction of the incoming/outgoing quarks. We show that the dominant part of the
known one loop result can be understood in an axial gauge as the result of a
semi-eikonal approximation to the box diagram. We then derive an all order
result for the leading contribution of the ladder diagrams and deduce a
resummation formula valid in the vicinity of the boundaries of the regions
defining the energy flows of the incoming/outcoming quarks, i.e. x = +/- xi.
The resummed series results in a simple closed expression.
|
[
{
"created": "Thu, 19 Jul 2012 10:41:10 GMT",
"version": "v1"
}
] |
2015-06-05
|
[
[
"Altinoluk",
"T.",
""
],
[
"Pire",
"B.",
""
],
[
"Szymanowski",
"L.",
""
],
[
"Wallon",
"S.",
""
]
] |
We calculate the quark coefficient function Tq(x,xi) that enters the factorized amplitude for deeply virtual Compton scattering (DVCS) at all order in a soft and collinear gluon approximation, focusing on the leading double logarithmic behavior in x +/- xi, where x +/- xi is the light cone momentum fraction of the incoming/outgoing quarks. We show that the dominant part of the known one loop result can be understood in an axial gauge as the result of a semi-eikonal approximation to the box diagram. We then derive an all order result for the leading contribution of the ladder diagrams and deduce a resummation formula valid in the vicinity of the boundaries of the regions defining the energy flows of the incoming/outcoming quarks, i.e. x = +/- xi. The resummed series results in a simple closed expression.
|
hep-ph/9803429
|
Gabriel Sanchez-Colon
|
V. Gupta (1), P. Ritto (1), and G. Sanchez-Colon (1,2) ((1)
CINVESTAV-Merida, (2) UC-Riverside)
|
Masses, Magnetic Moments, and Semileptonic Decays of Spin 1/2 Baryons
with Sea Contribution
|
Submitted to Int. J. of Mod. Phys. A (1998)
|
Mod.Phys.Lett. A13 (1998) 2887-2902
|
10.1142/S0217732398003065
|
IJMPA_0398
|
hep-ph
| null |
The spin 1/2 baryons are pictured as a composite system made out of a "core"
of three valence quarks (as in the simple quark model) surrounded by a "sea"
(of gluon and $q\bar{q}$ pairs) which is specified by its total quantum
numbers. We assume the sea is a SU(3) flavor octet with spin 0 or 1 but no
color. This model, considered earlier, is used to obtain simultaneous fits for
masses, magnetic moments and $G_A/G_V$ for semileptonic decays. These fits give
predictions for nucleon spin distributions in reasonable agreement with
experiment.
|
[
{
"created": "Mon, 23 Mar 1998 20:03:02 GMT",
"version": "v1"
}
] |
2009-10-31
|
[
[
"Gupta",
"V.",
""
],
[
"Ritto",
"P.",
""
],
[
"Sanchez-Colon",
"G.",
""
]
] |
The spin 1/2 baryons are pictured as a composite system made out of a "core" of three valence quarks (as in the simple quark model) surrounded by a "sea" (of gluon and $q\bar{q}$ pairs) which is specified by its total quantum numbers. We assume the sea is a SU(3) flavor octet with spin 0 or 1 but no color. This model, considered earlier, is used to obtain simultaneous fits for masses, magnetic moments and $G_A/G_V$ for semileptonic decays. These fits give predictions for nucleon spin distributions in reasonable agreement with experiment.
|
hep-ph/9409378
|
Alexander Khodjamirian
|
A. Khodjamirian, R. R\"uckl
|
Heavy Meson Form Factors, Couplings and Exclusive Decays in QCD
|
5 pages +1 figure added as uuencoded .ps file, LaTeX ( presented by
R. R\"uckl at the QCD-94 Workshop " Montpellier, July 7-13 1994),
MPI-PhT/94-63, LMU-16/94
|
Nucl.Phys.Proc.Suppl. 39BC (1995) 396-398
|
10.1016/0920-5632(95)00108-L
| null |
hep-ph
| null |
We discuss the form factors of the heavy-to-light transitions $B \ra \pi$ and
$D\ra \pi$, the $B^*B \pi$ and $D^*D \pi$ coupling constants, and the
nonfactorizable amplitude of the decay $ B \ra J/\psi K$ in the framework of
QCD sum rules.
|
[
{
"created": "Wed, 21 Sep 1994 19:02:28 GMT",
"version": "v1"
}
] |
2009-10-28
|
[
[
"Khodjamirian",
"A.",
""
],
[
"Rückl",
"R.",
""
]
] |
We discuss the form factors of the heavy-to-light transitions $B \ra \pi$ and $D\ra \pi$, the $B^*B \pi$ and $D^*D \pi$ coupling constants, and the nonfactorizable amplitude of the decay $ B \ra J/\psi K$ in the framework of QCD sum rules.
|
1902.04110
|
Fabio Siringo
|
Fabio Siringo
|
Calculation of the non-perturbative strong coupling from first
principles
|
In the last versions a typo has been corrected in Table I and a
figure has been added (fig1b), illustrating the optimization of the ghost
function
|
Phys. Rev. D 100, 074014 (2019)
|
10.1103/PhysRevD.100.074014
| null |
hep-ph hep-lat hep-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
The success of the screened massive expansion is investigated in the
framework of a screened momentum-subtraction scheme for the running of the
strong coupling in pure Yang-Mills theory. By the exact Slavnov-Taylor and
Nielsen identities, a very predictive and self-contained set of stationary
conditions are derived for the optimization of the fixed-coupling expansion,
yielding explicit analytical one-loop expressions for the propagators, the
coupling and the beta function, from first principles. An excellent agreement
is found with the lattice data. In the proposed screened renormalization
scheme, a monotonic running coupling emerges which saturates in the IR at the
finite IR stable fixed point $g=9.40$ where the beta function crosses the zero.
A simple analytical expression is derived for the leading behavior of the beta
in the IR.
|
[
{
"created": "Mon, 11 Feb 2019 19:39:39 GMT",
"version": "v1"
},
{
"created": "Sat, 28 Sep 2019 08:59:27 GMT",
"version": "v2"
},
{
"created": "Sun, 6 Oct 2019 19:53:00 GMT",
"version": "v3"
}
] |
2019-10-16
|
[
[
"Siringo",
"Fabio",
""
]
] |
The success of the screened massive expansion is investigated in the framework of a screened momentum-subtraction scheme for the running of the strong coupling in pure Yang-Mills theory. By the exact Slavnov-Taylor and Nielsen identities, a very predictive and self-contained set of stationary conditions are derived for the optimization of the fixed-coupling expansion, yielding explicit analytical one-loop expressions for the propagators, the coupling and the beta function, from first principles. An excellent agreement is found with the lattice data. In the proposed screened renormalization scheme, a monotonic running coupling emerges which saturates in the IR at the finite IR stable fixed point $g=9.40$ where the beta function crosses the zero. A simple analytical expression is derived for the leading behavior of the beta in the IR.
|
hep-ph/0611131
|
Jinfeng Liao
|
Jinfeng Liao and Edward Shuryak
|
Strongly coupled plasma with electric and magnetic charges
|
2nd version, 22 pages, 32 figures: two important new figures have
been included to compare our results with RHIC experiments and AdS/CFT
results; a few new references and comments are added as well
|
Phys.Rev.C75:054907,2007
|
10.1103/PhysRevC.75.054907
| null |
hep-ph
| null |
A number of theoretical and lattice results lead us to believe that
Quark-Gluon Plasma not too far from $T_c$ contains not only electrically
charged quasiparticles -- quarks and gluons -- but magnetically charged ones --
monopoles and dyons -- as well. Although binary systems like charge-monopole
and charge-dyon were considered in details before in both classical and quantum
settings, it is the first study of coexisting electric and magnetic particles
in many-body context. We perform Molecular Dynamics study of strongly coupled
plasmas with $\sim 1000$ particles and different fraction of magnetic charges.
Correlation functions and Kubo formulae lead to such transport properties as
diffusion constant, shear viscosity and electric conductivity: we compare the
first two with empirical data from RHIC experiments as well as results from
AdS/CFT correspondence. We also study a number of collective excitations in
these systems.
|
[
{
"created": "Thu, 9 Nov 2006 20:48:13 GMT",
"version": "v1"
},
{
"created": "Tue, 12 Dec 2006 02:20:09 GMT",
"version": "v2"
}
] |
2008-11-26
|
[
[
"Liao",
"Jinfeng",
""
],
[
"Shuryak",
"Edward",
""
]
] |
A number of theoretical and lattice results lead us to believe that Quark-Gluon Plasma not too far from $T_c$ contains not only electrically charged quasiparticles -- quarks and gluons -- but magnetically charged ones -- monopoles and dyons -- as well. Although binary systems like charge-monopole and charge-dyon were considered in details before in both classical and quantum settings, it is the first study of coexisting electric and magnetic particles in many-body context. We perform Molecular Dynamics study of strongly coupled plasmas with $\sim 1000$ particles and different fraction of magnetic charges. Correlation functions and Kubo formulae lead to such transport properties as diffusion constant, shear viscosity and electric conductivity: we compare the first two with empirical data from RHIC experiments as well as results from AdS/CFT correspondence. We also study a number of collective excitations in these systems.
|
hep-ph/9712445
|
Bhaskar Dutta
|
N.G. Deshpande, B. Dutta, and Sechul Oh
|
Branching Ratios and CP Asymmetries of B Decays to a Vector and a
Pseudoscalar Meson
|
15 pages(Latex), 3 Figures
|
Phys.Lett. B473 (2000) 141-147
|
10.1016/S0370-2693(99)01460-4
|
OITS-644, COLO-HEP-394
|
hep-ph
| null |
We consider two body decays of B meson into a light vector (V) and a
pseudoscalar (P) meson. The constraint obtained from the $B\to P P$ modes on
the parameter space of the input parameters is imposed also on $B\to V P$
modes. In particular we constrain $\xi\equiv (1/N_c)$ for those modes from
recently measured $B\to \omega K, \phi K$ and are able to get a satisfactory
pictures for all modes where data exists. Modes that should be seen shortly and
those with possibly large CP asymmetries are identified.
|
[
{
"created": "Thu, 18 Dec 1997 22:17:49 GMT",
"version": "v1"
}
] |
2009-10-30
|
[
[
"Deshpande",
"N. G.",
""
],
[
"Dutta",
"B.",
""
],
[
"Oh",
"Sechul",
""
]
] |
We consider two body decays of B meson into a light vector (V) and a pseudoscalar (P) meson. The constraint obtained from the $B\to P P$ modes on the parameter space of the input parameters is imposed also on $B\to V P$ modes. In particular we constrain $\xi\equiv (1/N_c)$ for those modes from recently measured $B\to \omega K, \phi K$ and are able to get a satisfactory pictures for all modes where data exists. Modes that should be seen shortly and those with possibly large CP asymmetries are identified.
|
hep-ph/9207250
| null |
A. Zhitnitsky
|
Once more on $\theta$-vacua in $2+1$ dimensional QED and 3+1 dimensional
gluodynamics
|
15 pages
|
Phys.Lett.B291:465-472,1992
|
10.1016/0370-2693(92)91405-X
|
IASSNS 91-76
|
hep-ph
| null |
Two different but tightly connected problems, $U(1)$ and strong CP violation
problems, are discussed in two different models which exhibit both asymptotic
freedom and confinement. One of them is the 3d Polyakov's model of compact QED
and the other is 4d gluodynamics. It is shown that although both these models
possess the long range interactions of the topological charges, only in the
former case physics does not depend on $\theta$; while the latter exhibits an
explicit $\theta$- dependence. The crucial difference is due to the
observation, that the pseudoparticles of 4d gluodynamics possess an aditional
quantum number, apart of the topological charge $Q$ .
|
[
{
"created": "Tue, 21 Jul 1992 08:39:46 GMT",
"version": "v1"
}
] |
2010-11-01
|
[
[
"Zhitnitsky",
"A.",
""
]
] |
Two different but tightly connected problems, $U(1)$ and strong CP violation problems, are discussed in two different models which exhibit both asymptotic freedom and confinement. One of them is the 3d Polyakov's model of compact QED and the other is 4d gluodynamics. It is shown that although both these models possess the long range interactions of the topological charges, only in the former case physics does not depend on $\theta$; while the latter exhibits an explicit $\theta$- dependence. The crucial difference is due to the observation, that the pseudoparticles of 4d gluodynamics possess an aditional quantum number, apart of the topological charge $Q$ .
|
1612.01795
|
Reza Goldouzian
|
Reza Goldouzian and Barbara Clerbaux
|
Search for anomalous tq$\gamma$ FCNC Couplings in direct single top
quark production at the LHC
|
Presented at '9th International Workshop on Top Quark Physics',
Olomouc, Czech Republic, September 19-23 (2016). Complete paper can be found
in arXiv:1609.04838
| null | null | null |
hep-ph hep-ex
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
In this paper we propose and study direct single top quark production channel
for probing the tq$\gamma$ flavor-changing neutral current (FCNC) interactions
at the LHC. We reinterpret the experimental results of a search for direct
single top quark production performed by ATLAS collaboration at 8 TeV to set
upper bounds on the FCNC top quark decay branching fractions through the
proposed channel, resulting in ${\cal B}$(t$\rightarrow$ u$\gamma$) $<$ 0.05\%
and ${\cal B}$(t$\rightarrow$ c$\gamma$) $<$ 0.14\%. Finally, the expected
sensitivity at 13 TeV for various integrated luminosity scenarios is estimated.
|
[
{
"created": "Tue, 6 Dec 2016 13:16:01 GMT",
"version": "v1"
}
] |
2016-12-07
|
[
[
"Goldouzian",
"Reza",
""
],
[
"Clerbaux",
"Barbara",
""
]
] |
In this paper we propose and study direct single top quark production channel for probing the tq$\gamma$ flavor-changing neutral current (FCNC) interactions at the LHC. We reinterpret the experimental results of a search for direct single top quark production performed by ATLAS collaboration at 8 TeV to set upper bounds on the FCNC top quark decay branching fractions through the proposed channel, resulting in ${\cal B}$(t$\rightarrow$ u$\gamma$) $<$ 0.05\% and ${\cal B}$(t$\rightarrow$ c$\gamma$) $<$ 0.14\%. Finally, the expected sensitivity at 13 TeV for various integrated luminosity scenarios is estimated.
|
2106.15053
|
Zhan-Wei Liu
|
Ming-Wei Li, Zhan-Wei Liu, Zhi-Feng Sun, Rui Chen
|
Magnetic moments and transition magnetic moments of $P_c$ and $P_{cs}$
states
|
8 pages, 5 tables; version appeared in Phys. Rev. D
|
Phys. Rev. D 104, 054016 (2021)
|
10.1103/PhysRevD.104.054016
| null |
hep-ph
|
http://creativecommons.org/licenses/by/4.0/
|
We study the magnetic moments and transition magnetic moments of $P_c$ and
$P_{cs}$ states in the molecular picture. We first revisit the magnetic moments
of $P_c$ states as the $S$ wave molecular states without coupled channel
effects. The coupled channel effects and the $D$ wave contributions are then
investigated carefully. The coupled channel effects contribute to the change of
$0.1\sim 0.4$ nuclear magneton $\mu_N$ for most cases while the $D$ wave only
induces the variation of less than $0.03 ~\mu_N$. In addition, we obtain the
transition magnetic moments between different $P_c$ states and the related
electromagnetic decay widths of $P_c'\to P_c\gamma$. The magnetic moments of
$P_{cs}$ are much different for the assumption of spin being 1/2 and 3/2. The
study of electromagnetic properties will help us disclose further the structure
of these unconventional states.
|
[
{
"created": "Tue, 29 Jun 2021 01:47:35 GMT",
"version": "v1"
},
{
"created": "Thu, 16 Sep 2021 15:54:59 GMT",
"version": "v2"
}
] |
2021-09-22
|
[
[
"Li",
"Ming-Wei",
""
],
[
"Liu",
"Zhan-Wei",
""
],
[
"Sun",
"Zhi-Feng",
""
],
[
"Chen",
"Rui",
""
]
] |
We study the magnetic moments and transition magnetic moments of $P_c$ and $P_{cs}$ states in the molecular picture. We first revisit the magnetic moments of $P_c$ states as the $S$ wave molecular states without coupled channel effects. The coupled channel effects and the $D$ wave contributions are then investigated carefully. The coupled channel effects contribute to the change of $0.1\sim 0.4$ nuclear magneton $\mu_N$ for most cases while the $D$ wave only induces the variation of less than $0.03 ~\mu_N$. In addition, we obtain the transition magnetic moments between different $P_c$ states and the related electromagnetic decay widths of $P_c'\to P_c\gamma$. The magnetic moments of $P_{cs}$ are much different for the assumption of spin being 1/2 and 3/2. The study of electromagnetic properties will help us disclose further the structure of these unconventional states.
|
1303.1603
|
Paul Hoyer
|
Paul Hoyer
|
Are hadrons simpler than they seem?
|
4 pages. Talk presented at the 3rd Workshop on the QCD Structure of
the Nucleon (QCD-N'12), 22-26 October 2012 in Bilbao, Spain
| null |
10.1393/ncc/i2013-11573-7
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
I briefly review a systematic approximation scheme of QCD in which the quark
model picture of hadrons emerges at lowest order. A linear A^0 potential arises
if Gauss' law is solved with a non-vanishing boundary condition at spatial
infinity. Similarly to the Dirac case one can describe relativistic states
including any number of particle pairs (sea quarks) using valence wave
functions, whose norms give {\em inclusive} probability densities. Provided
\alpha_s(Q^2) freezes in the infrared, perturbative corrections to the S-matrix
can be calculated in the usual way, but with states bound by the linear
\order{\alpha_s^0} potential instead of plane waves in the in and out states.
|
[
{
"created": "Thu, 7 Mar 2013 04:52:43 GMT",
"version": "v1"
}
] |
2022-03-02
|
[
[
"Hoyer",
"Paul",
""
]
] |
I briefly review a systematic approximation scheme of QCD in which the quark model picture of hadrons emerges at lowest order. A linear A^0 potential arises if Gauss' law is solved with a non-vanishing boundary condition at spatial infinity. Similarly to the Dirac case one can describe relativistic states including any number of particle pairs (sea quarks) using valence wave functions, whose norms give {\em inclusive} probability densities. Provided \alpha_s(Q^2) freezes in the infrared, perturbative corrections to the S-matrix can be calculated in the usual way, but with states bound by the linear \order{\alpha_s^0} potential instead of plane waves in the in and out states.
|
hep-ph/9502364
|
G. B. Pivovarov
|
Grigorii B. Pivovarov
|
Gauge Dependence of Four-Fermion QED Green Function and Atom-Like Bound
State Calculations
|
10 pages, latex, no figures, lines longer than 80 char corrected
| null | null |
INR-0881/95
|
hep-ph
| null |
We derive a relation between four-fermion QED Green functions of different
covariant gauges which defines the gauge dependence completely. We use the
derived gauge dependence to check the gauge invariance of atom-like bound state
calculations. We find that the existing QED procedure does not provide gauge
invariant binding energies. A way to a corrected gauge invariant procedure is
pointed out.
|
[
{
"created": "Wed, 22 Feb 1995 09:18:26 GMT",
"version": "v1"
},
{
"created": "Thu, 23 Feb 1995 12:54:46 GMT",
"version": "v2"
}
] |
2016-09-01
|
[
[
"Pivovarov",
"Grigorii B.",
""
]
] |
We derive a relation between four-fermion QED Green functions of different covariant gauges which defines the gauge dependence completely. We use the derived gauge dependence to check the gauge invariance of atom-like bound state calculations. We find that the existing QED procedure does not provide gauge invariant binding energies. A way to a corrected gauge invariant procedure is pointed out.
|
1912.13129
|
Yevgeny Stadnik
|
V. V. Flambaum, M. Pospelov, A. Ritz, Y. V. Stadnik
|
Sensitivity of EDM experiments in paramagnetic atoms and molecules to
hadronic CP violation
|
7 pages, 3 figures, version accepted for publication in Physical
Review D
|
Phys. Rev. D 102, 035001 (2020)
|
10.1103/PhysRevD.102.035001
| null |
hep-ph nucl-th physics.atom-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Experiments searching for the electric dipole moment (EDM) of the electron
$d_e$ utilise atomic/molecular states with one or more uncompensated electron
spins, and these paramagnetic systems have recently achieved remarkable
sensitivity to $d_e$. If the source of $CP$ violation resides entirely in the
hadronic sector, the two-photon exchange processes between electrons and the
nucleus induce $CP$-odd semileptonic interactions, parametrised by the Wilson
coefficient $C_{SP}$, and provide the dominant source of EDMs in paramagnetic
systems instead of $d_e$. We evaluate the $C_{SP}$ coefficients induced by the
leading hadronic sources of $CP$ violation, namely nucleon EDMs and $CP$-odd
pion-nucleon couplings, by calculating the nucleon-number-enhanced $CP$-odd
nuclear scalar polarisability, employing chiral perturbation theory at the
nucleon level and the Fermi-gas model for the nucleus. This allows us to
translate the ACME EDM limits from paramagnetic ThO into novel independent
constraints on the QCD theta term $|\bar \theta| < 3 \times 10^{-8}$, proton
EDM $|d_p| < 2 \times 10^{-23}\,e\,{\rm cm}$, isoscalar $CP$-odd pion-nucleon
coupling $|\bar g^{(1)}_{\pi NN}| < 4 \times 10^{-10}$, and colour EDMs of
quarks $|\tilde d_u - \tilde d_d| < 2 \times 10^{-24}\,{\rm cm}$. We note that
further experimental progress with EDM experiments in paramagnetic systems may
allow them to rival the sensitivity of EDM experiments with neutrons and
diamagnetic atoms to these quantities.
|
[
{
"created": "Tue, 31 Dec 2019 00:52:10 GMT",
"version": "v1"
},
{
"created": "Wed, 22 Apr 2020 09:30:39 GMT",
"version": "v2"
},
{
"created": "Tue, 28 Jul 2020 03:45:37 GMT",
"version": "v3"
}
] |
2020-08-12
|
[
[
"Flambaum",
"V. V.",
""
],
[
"Pospelov",
"M.",
""
],
[
"Ritz",
"A.",
""
],
[
"Stadnik",
"Y. V.",
""
]
] |
Experiments searching for the electric dipole moment (EDM) of the electron $d_e$ utilise atomic/molecular states with one or more uncompensated electron spins, and these paramagnetic systems have recently achieved remarkable sensitivity to $d_e$. If the source of $CP$ violation resides entirely in the hadronic sector, the two-photon exchange processes between electrons and the nucleus induce $CP$-odd semileptonic interactions, parametrised by the Wilson coefficient $C_{SP}$, and provide the dominant source of EDMs in paramagnetic systems instead of $d_e$. We evaluate the $C_{SP}$ coefficients induced by the leading hadronic sources of $CP$ violation, namely nucleon EDMs and $CP$-odd pion-nucleon couplings, by calculating the nucleon-number-enhanced $CP$-odd nuclear scalar polarisability, employing chiral perturbation theory at the nucleon level and the Fermi-gas model for the nucleus. This allows us to translate the ACME EDM limits from paramagnetic ThO into novel independent constraints on the QCD theta term $|\bar \theta| < 3 \times 10^{-8}$, proton EDM $|d_p| < 2 \times 10^{-23}\,e\,{\rm cm}$, isoscalar $CP$-odd pion-nucleon coupling $|\bar g^{(1)}_{\pi NN}| < 4 \times 10^{-10}$, and colour EDMs of quarks $|\tilde d_u - \tilde d_d| < 2 \times 10^{-24}\,{\rm cm}$. We note that further experimental progress with EDM experiments in paramagnetic systems may allow them to rival the sensitivity of EDM experiments with neutrons and diamagnetic atoms to these quantities.
|
2101.11200
|
Xiang Liu
|
Fu-Lai Wang, Xin-Dian Yang, Rui Chen and Xiang Liu
|
Hidden-charm pentaquarks with triple strangeness due to the
$\Omega_{c}^{(*)}\bar{D}_s^{(*)}$ interactions
|
11 pages, 3 figures and 7 tables. More discussions added. Accepted by
Phys. Rev. D
|
Phys. Rev. D 103, 054025 (2021)
|
10.1103/PhysRevD.103.054025
| null |
hep-ph hep-ex
|
http://creativecommons.org/publicdomain/zero/1.0/
|
Motivated by the successful interpretation of these observed $P_c$ and
$P_{cs}$ states under the meson-baryon molecular picture, we systematically
investigate the possible hidden-charm molecular pentaquark states with triple
strangeness which is due to the $\Omega_{c}^{(*)}\bar{D}_s^{(*)}$ interactions.
We perform a dynamical calculation of the possible hidden-charm molecular
pentaquarks with triple strangeness by the one-boson-exchange model, where the
$S$-$D$ wave mixing effect and the coupled channel effect are taken into
account in our calculation. Our results suggest that the $\Omega_{c}\bar D_s^*$
state with $J^P={3}/{2}^{-}$ and the $\Omega_{c}^{*}\bar D_s^*$ state with
$J^P={5}/{2}^{-}$ can be recommended as the candidates of the hidden-charm
molecular pentaquark with triple strangeness. Furthermore, we discuss the
two-body hidden-charm strong decay behaviors of these possible hidden-charm
molecular pentaquarks with triple strangeness by adopting the quark-interchange
model. These predictions are expected to be tested at the LHCb, which can be as
a potential research issue with more accumulated experimental data in near
future.
|
[
{
"created": "Wed, 27 Jan 2021 04:37:22 GMT",
"version": "v1"
},
{
"created": "Wed, 24 Feb 2021 08:23:38 GMT",
"version": "v2"
},
{
"created": "Mon, 22 Mar 2021 16:07:07 GMT",
"version": "v3"
}
] |
2021-03-31
|
[
[
"Wang",
"Fu-Lai",
""
],
[
"Yang",
"Xin-Dian",
""
],
[
"Chen",
"Rui",
""
],
[
"Liu",
"Xiang",
""
]
] |
Motivated by the successful interpretation of these observed $P_c$ and $P_{cs}$ states under the meson-baryon molecular picture, we systematically investigate the possible hidden-charm molecular pentaquark states with triple strangeness which is due to the $\Omega_{c}^{(*)}\bar{D}_s^{(*)}$ interactions. We perform a dynamical calculation of the possible hidden-charm molecular pentaquarks with triple strangeness by the one-boson-exchange model, where the $S$-$D$ wave mixing effect and the coupled channel effect are taken into account in our calculation. Our results suggest that the $\Omega_{c}\bar D_s^*$ state with $J^P={3}/{2}^{-}$ and the $\Omega_{c}^{*}\bar D_s^*$ state with $J^P={5}/{2}^{-}$ can be recommended as the candidates of the hidden-charm molecular pentaquark with triple strangeness. Furthermore, we discuss the two-body hidden-charm strong decay behaviors of these possible hidden-charm molecular pentaquarks with triple strangeness by adopting the quark-interchange model. These predictions are expected to be tested at the LHCb, which can be as a potential research issue with more accumulated experimental data in near future.
|
0907.5387
|
Guido Mueller
|
Guido Mueller, Pierre Sikivie, D.B. Tanner, Karl van Bibber
|
Detailed design of a resonantly-enhanced axion-photon regeneration
experiment
|
10 pages, 5 figures
|
Phys.Rev.D80:072004,2009
|
10.1103/PhysRevD.80.072004
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
A resonantly-enhanced photon-regeneration experiment to search for the axion
or axion-like particles is described. This experiment is a shining light
through walls study, where photons travelling through a strong magnetic field
are (in part) converted to axions; the axions can pass through an opaque wall
and convert (in part) back to photons in a second region of strong magnetic
field. The photon regeneration is enhanced by employing matched Fabry-Perot
optical cavities, with one cavity within the axion generation magnet and the
second within the photon regeneration magnet. Compared to simple single-pass
photon regeneration, this technique would result in a gain of (F/pi)^2, where F
is the finesse of each cavity. This gain could feasibly be as high as 10^(10),
corresponding to an improvement in the sensitivity to the axion-photon
coupling, g_(agg), of order (F/pi)^(1/2) ~ 300. This improvement would enable,
for the first time, a purely laboratory experiment to probe axion-photon
couplings at a level competitive with, or superior to, limits from stellar
evolution or solar axion searches. This report gives a detailed discussion of
the scheme for actively controlling the two Fabry-Perot cavities and the laser
frequencies, and describes the heterodyne signal detection system, with limits
ultimately imposed by shot noise.
|
[
{
"created": "Thu, 30 Jul 2009 18:20:51 GMT",
"version": "v1"
},
{
"created": "Wed, 16 Sep 2009 22:03:27 GMT",
"version": "v2"
}
] |
2009-10-29
|
[
[
"Mueller",
"Guido",
""
],
[
"Sikivie",
"Pierre",
""
],
[
"Tanner",
"D. B.",
""
],
[
"van Bibber",
"Karl",
""
]
] |
A resonantly-enhanced photon-regeneration experiment to search for the axion or axion-like particles is described. This experiment is a shining light through walls study, where photons travelling through a strong magnetic field are (in part) converted to axions; the axions can pass through an opaque wall and convert (in part) back to photons in a second region of strong magnetic field. The photon regeneration is enhanced by employing matched Fabry-Perot optical cavities, with one cavity within the axion generation magnet and the second within the photon regeneration magnet. Compared to simple single-pass photon regeneration, this technique would result in a gain of (F/pi)^2, where F is the finesse of each cavity. This gain could feasibly be as high as 10^(10), corresponding to an improvement in the sensitivity to the axion-photon coupling, g_(agg), of order (F/pi)^(1/2) ~ 300. This improvement would enable, for the first time, a purely laboratory experiment to probe axion-photon couplings at a level competitive with, or superior to, limits from stellar evolution or solar axion searches. This report gives a detailed discussion of the scheme for actively controlling the two Fabry-Perot cavities and the laser frequencies, and describes the heterodyne signal detection system, with limits ultimately imposed by shot noise.
|
2209.10816
|
Cong Zhang
|
Jinmian Li, Junle Pei, Cong Zhang
|
Investigating the collinear splitting effects of boosted dark matter at
neutrino detectors
|
27 pages, 7 figures, version to appear in JHEP
| null |
10.1007/JHEP02(2023)068
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We study the probing prospects of cosmic ray boosted dark matter (DM) in the
framework of simplified electron-philic dark photon model. Focusing on the dark
matter and dark photon masses around keV $\sim $ MeV scale, we consider the
bounds obtained from the XENON1T and Super-K experiments. The electron bound
state effects are treated carefully in calculating the XENON1T constraint. As
for the detection at neutrino detector where the energy threshold is relatively
higher, the large logarithmic effects induced by the scale hierarchy between
the masses and momentum transfer are considered by introducing the DM parton
distribution function (PDF). The logarithmic effects will reduce the electron
recoil rate for DM scattering in neutrino detectors. Moreover, we find the DUNE
and JUNO experiments provide high sensitivities for probing the dark photon
component in the DM PDF through the dark Compton process. We also check the
Bullet Cluster constraint on the DM self-scattering cross section.
|
[
{
"created": "Thu, 22 Sep 2022 06:49:01 GMT",
"version": "v1"
},
{
"created": "Tue, 7 Feb 2023 07:04:12 GMT",
"version": "v2"
}
] |
2023-02-13
|
[
[
"Li",
"Jinmian",
""
],
[
"Pei",
"Junle",
""
],
[
"Zhang",
"Cong",
""
]
] |
We study the probing prospects of cosmic ray boosted dark matter (DM) in the framework of simplified electron-philic dark photon model. Focusing on the dark matter and dark photon masses around keV $\sim $ MeV scale, we consider the bounds obtained from the XENON1T and Super-K experiments. The electron bound state effects are treated carefully in calculating the XENON1T constraint. As for the detection at neutrino detector where the energy threshold is relatively higher, the large logarithmic effects induced by the scale hierarchy between the masses and momentum transfer are considered by introducing the DM parton distribution function (PDF). The logarithmic effects will reduce the electron recoil rate for DM scattering in neutrino detectors. Moreover, we find the DUNE and JUNO experiments provide high sensitivities for probing the dark photon component in the DM PDF through the dark Compton process. We also check the Bullet Cluster constraint on the DM self-scattering cross section.
|
hep-ph/9901207
|
Robert Brandenberger
|
V. Zanchin, A. Maia Jr., W. Craig and R. Brandenberger
|
Reheating in the Presence of Inhomogeneous Noise
|
21 pages, 4 figures
|
Phys.Rev. D60 (1999) 023505
|
10.1103/PhysRevD.60.023505
|
BROWN-HET-1085
|
hep-ph astro-ph gr-qc
| null |
Explosive particle production due to parametric resonance is a crucial
feature of reheating in an inflationary cosmology. Coherent oscillations of the
inflaton field lead to a periodically varying mass in the evolution equation of
matter and gravitational fluctuations and often induce a parametric resonance
instability. In a previous paper (hep-ph/9709273) it was shown that homogeneous
(i.e. space independent) noise leads to an increase of the generalized Floquet
exponent for all modes, at least if the noise is temporally uncorrelated. Here
we extend the results to the physically more realistic case of spatially
inhomogeneous noise. We demonstrate - modulo some mathematical fine points
which are addressed in a companion paper - that the Floquet exponent is a non-
decreasing function of the amplitude of the noise. We provide numerical
evidence for an even stronger statement, namely that in the presence of
inhomogeneous noise, the Floquet exponent of each mode is larger than the
maximal Floquet exponent of the system in the absence of noise.
|
[
{
"created": "Sat, 2 Jan 1999 22:33:43 GMT",
"version": "v1"
}
] |
2009-10-31
|
[
[
"Zanchin",
"V.",
""
],
[
"Maia",
"A.",
"Jr."
],
[
"Craig",
"W.",
""
],
[
"Brandenberger",
"R.",
""
]
] |
Explosive particle production due to parametric resonance is a crucial feature of reheating in an inflationary cosmology. Coherent oscillations of the inflaton field lead to a periodically varying mass in the evolution equation of matter and gravitational fluctuations and often induce a parametric resonance instability. In a previous paper (hep-ph/9709273) it was shown that homogeneous (i.e. space independent) noise leads to an increase of the generalized Floquet exponent for all modes, at least if the noise is temporally uncorrelated. Here we extend the results to the physically more realistic case of spatially inhomogeneous noise. We demonstrate - modulo some mathematical fine points which are addressed in a companion paper - that the Floquet exponent is a non- decreasing function of the amplitude of the noise. We provide numerical evidence for an even stronger statement, namely that in the presence of inhomogeneous noise, the Floquet exponent of each mode is larger than the maximal Floquet exponent of the system in the absence of noise.
|
hep-ph/0606165
|
Erhan Iltan
|
Erhan O. Iltan
|
Charged Lepton Flavor Physics and Extra Dimensions
|
23 pages, 13 pages
|
Mod.Phys.Lett.A22:1513-1531,2007
|
10.1142/S0217732307021731
| null |
hep-ph
| null |
We estimate the charged lepton electric dipole moments and the branching
ratios of radiative lepton flavor violating decays in the framework of the two
Higgs doublet model with the inclusion two extra dimensions. Here, we consider
that the new Higgs doublet is accessible to one of the extra dimensions with a
Gaussian profile and the fermions are accessible to the other extra dimension
with uniform zero mode profile. We observe that the numerical values of the
physical quantities studied enhance with the additional effects due to the
extra dimensions and they are sensitive to the new Higgs localization.
|
[
{
"created": "Wed, 14 Jun 2006 20:05:41 GMT",
"version": "v1"
},
{
"created": "Sat, 19 May 2007 13:56:26 GMT",
"version": "v2"
}
] |
2008-11-26
|
[
[
"Iltan",
"Erhan O.",
""
]
] |
We estimate the charged lepton electric dipole moments and the branching ratios of radiative lepton flavor violating decays in the framework of the two Higgs doublet model with the inclusion two extra dimensions. Here, we consider that the new Higgs doublet is accessible to one of the extra dimensions with a Gaussian profile and the fermions are accessible to the other extra dimension with uniform zero mode profile. We observe that the numerical values of the physical quantities studied enhance with the additional effects due to the extra dimensions and they are sensitive to the new Higgs localization.
|
hep-ph/0201210
|
Yu-Ping Kuang
|
Yu-Ping Kuang
|
S-D Mixing and Searching for the psi(1P1) State at the Beijing
Electron-Positron Coolider
|
9-page RevTex file. Version for publication in Phys. Rev. D
|
Phys.Rev. D65 (2002) 094024
|
10.1103/PhysRevD.65.094024
|
TUHEP-TH-01129
|
hep-ph
| null |
The psi(1P1) state can be produced at the Beijing Electron-Positron Collider
(BEPC) in the process psi'-->psi(1P1)+pi(0). We calculate the rate of this
process taking account of the S-D mixing effect in psi'. It is shown that the
rate is about a factor of 3 smaller than the simple result without considering
the S-D mixing effect. Possible detecting channels are suggested and it is
shown that psi(1P1) is able to be found with the accumulation of 30 million
events of psi' at BEPC.
|
[
{
"created": "Tue, 22 Jan 2002 22:49:36 GMT",
"version": "v1"
},
{
"created": "Thu, 24 Jan 2002 10:02:27 GMT",
"version": "v2"
},
{
"created": "Sun, 10 Feb 2002 11:00:48 GMT",
"version": "v3"
},
{
"created": "Fri, 12 Apr 2002 13:21:26 GMT",
"version": "v4"
}
] |
2009-11-07
|
[
[
"Kuang",
"Yu-Ping",
""
]
] |
The psi(1P1) state can be produced at the Beijing Electron-Positron Collider (BEPC) in the process psi'-->psi(1P1)+pi(0). We calculate the rate of this process taking account of the S-D mixing effect in psi'. It is shown that the rate is about a factor of 3 smaller than the simple result without considering the S-D mixing effect. Possible detecting channels are suggested and it is shown that psi(1P1) is able to be found with the accumulation of 30 million events of psi' at BEPC.
|
1205.4896
|
Sergey Gevorkyan
|
S. R. Gevorkyan, E. A. Kuraev, M. K. Volkov
|
Vector exchanges in production of light meson pairs and elementary atoms
|
12 pages, 2 figures
|
J. Phys. G. Nucl. Part. Phys. 40: 015001,2013
|
10.1088/0954-3899/40/1/015001
| null |
hep-ph
|
http://creativecommons.org/licenses/by/3.0/
|
The production of pseudoscalar and scalar mesons pairs and bound states
(positronium or pionium atoms) in high energy $\gamma\gamma$ collisions at high
energies provided by photon or vector meson exchanges are considered. The
vector exchanges lead to nondecreasing with energy cross section of binary
process $\gamma+\gamma\to h_a+h_b$ with $h_a, h_b$ states in the fragmentation
regions of initial particles. The production of light mesons pairs $\pi\pi,
\eta\eta, \eta'\eta', \sigma\sigma $ as well as a pairs of positronium $Ps$ and
pionium $A_\pi$ atoms in peripheral kinematics are discussed. Unlike the photon
exchange the vector meson exchange needs a reggeization, leading to fall with
energy. Nevertheless due to peripheral kinematics out of very forward
production angles the vector meson exchanges dominated. The proposed approach
allows to express the matrix elements of the considered processes through
impact factors, which can be calculated in perturbation models like Chiral
Perturbation Theory (ChPT) or Nambu-Jona-Lasinio (NJL) model or determined from
$\gamma\gamma$ sub-processes or vector mesons radiative decay widths. We obtain
the cross sections for pionium atom production in collisions of high energy
pions and electrons with protons. The possibility to measure these processes in
experiment are discussed.
|
[
{
"created": "Tue, 22 May 2012 12:38:18 GMT",
"version": "v1"
}
] |
2015-06-05
|
[
[
"Gevorkyan",
"S. R.",
""
],
[
"Kuraev",
"E. A.",
""
],
[
"Volkov",
"M. K.",
""
]
] |
The production of pseudoscalar and scalar mesons pairs and bound states (positronium or pionium atoms) in high energy $\gamma\gamma$ collisions at high energies provided by photon or vector meson exchanges are considered. The vector exchanges lead to nondecreasing with energy cross section of binary process $\gamma+\gamma\to h_a+h_b$ with $h_a, h_b$ states in the fragmentation regions of initial particles. The production of light mesons pairs $\pi\pi, \eta\eta, \eta'\eta', \sigma\sigma $ as well as a pairs of positronium $Ps$ and pionium $A_\pi$ atoms in peripheral kinematics are discussed. Unlike the photon exchange the vector meson exchange needs a reggeization, leading to fall with energy. Nevertheless due to peripheral kinematics out of very forward production angles the vector meson exchanges dominated. The proposed approach allows to express the matrix elements of the considered processes through impact factors, which can be calculated in perturbation models like Chiral Perturbation Theory (ChPT) or Nambu-Jona-Lasinio (NJL) model or determined from $\gamma\gamma$ sub-processes or vector mesons radiative decay widths. We obtain the cross sections for pionium atom production in collisions of high energy pions and electrons with protons. The possibility to measure these processes in experiment are discussed.
|
1009.5413
|
Konstantin Goulianos
|
Konstantin Goulianos
|
Diffractive cross sections and event final states at the LHC
|
5 pages, 3 figures; to appear in Proceedings of Forward Physics at
LHC Workshop (May 27-29, 2010), Elba Island, Italy
| null | null | null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We discuss a phenomenological model that describes results on diffractive pp
and pbar-p cross sections and event final states up to the Fermilab Tevatron
collider energy of 1.96 TeV and use it to make predictions for Large Hadron
Collider (LHC) collision energies up to 14 TeV and asymptotically as the pp
collision energy goes to infinity. The model is anchored in a saturation effect
observed in single diffraction dissociation that explains quantitatively the
factorization breaking observed in soft and hard pp and pbar-p diffractive
processes and in diffractive photoproduction and low Q-square deep inelastic
scattering.
|
[
{
"created": "Mon, 27 Sep 2010 23:52:19 GMT",
"version": "v1"
},
{
"created": "Thu, 30 Dec 2010 01:30:08 GMT",
"version": "v2"
}
] |
2011-01-04
|
[
[
"Goulianos",
"Konstantin",
""
]
] |
We discuss a phenomenological model that describes results on diffractive pp and pbar-p cross sections and event final states up to the Fermilab Tevatron collider energy of 1.96 TeV and use it to make predictions for Large Hadron Collider (LHC) collision energies up to 14 TeV and asymptotically as the pp collision energy goes to infinity. The model is anchored in a saturation effect observed in single diffraction dissociation that explains quantitatively the factorization breaking observed in soft and hard pp and pbar-p diffractive processes and in diffractive photoproduction and low Q-square deep inelastic scattering.
|
1504.07673
|
Jo\~ao Moreira
|
J. Moreira, B. Hiller, A. A. Osipov and A. H. Blin
|
Nonuniform phases in the 't Hooft extended Nambu--Jona-Lasinio Model
|
5 pages, 4 figures. To appear in the Conference Proceedings for XI
Quark Confinement and the Hadron Spectrum, St. Petersburg, Russia, September
8-12 2014
| null |
10.1063/1.4938697
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
The phase diagram of cold dense quark matter is studied using the 't Hooft
extended Nambu--Jona-Lasinio Model applied to the light quark sector with a
finite current mass for the strange quark (up and down are considered in the
chiral limit). By relaxing the traditional uniformity assumptions and
considering a modulated light quark condensate background we investigate the
possible existence of non-uniform phases in this region of the phase diagram.
The effects of changes in the coupling strengths of the model are studied and
it is shown that the inclusion of flavour mixing combined with the finite
current mass of the strange quark catalyses the appearance of the non-uniform
phases, extending the domain for their existence.
|
[
{
"created": "Tue, 28 Apr 2015 22:13:14 GMT",
"version": "v1"
}
] |
2016-02-17
|
[
[
"Moreira",
"J.",
""
],
[
"Hiller",
"B.",
""
],
[
"Osipov",
"A. A.",
""
],
[
"Blin",
"A. H.",
""
]
] |
The phase diagram of cold dense quark matter is studied using the 't Hooft extended Nambu--Jona-Lasinio Model applied to the light quark sector with a finite current mass for the strange quark (up and down are considered in the chiral limit). By relaxing the traditional uniformity assumptions and considering a modulated light quark condensate background we investigate the possible existence of non-uniform phases in this region of the phase diagram. The effects of changes in the coupling strengths of the model are studied and it is shown that the inclusion of flavour mixing combined with the finite current mass of the strange quark catalyses the appearance of the non-uniform phases, extending the domain for their existence.
|
0802.2025
|
Kacper Zalewski
|
K. Zalewski
|
Use of cumulants to quantify uncertainties in the HBT measurements of
the homogeneity regions
|
LateX, 10 pages, no figures
|
Phys.Rev.D77:074006,2008
|
10.1103/PhysRevD.77.074006
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Let us denote p(x|K) the space density of the points where identical
particles of some kind, e.g. pi+ mesons, with momentum K are produced. When
using the HBT method to determine p(x|K) one encounters ambiguities. We show
that these ambiguities do not affect the even cumulants of the distribution
p(x|K). In particular, the HBT radii of the homogeneity regions, which are
given by the second order cumulants, and the distribution of distances between
the pairs of production points for particles with momentum K can be reliably
measured. The odd cumulants are ambiguous. The are, however, correlated. In
particular, when the average position <x>(K) is known as a function of K there
is no further ambiguity.
|
[
{
"created": "Thu, 14 Feb 2008 14:34:24 GMT",
"version": "v1"
}
] |
2008-11-26
|
[
[
"Zalewski",
"K.",
""
]
] |
Let us denote p(x|K) the space density of the points where identical particles of some kind, e.g. pi+ mesons, with momentum K are produced. When using the HBT method to determine p(x|K) one encounters ambiguities. We show that these ambiguities do not affect the even cumulants of the distribution p(x|K). In particular, the HBT radii of the homogeneity regions, which are given by the second order cumulants, and the distribution of distances between the pairs of production points for particles with momentum K can be reliably measured. The odd cumulants are ambiguous. The are, however, correlated. In particular, when the average position <x>(K) is known as a function of K there is no further ambiguity.
|
hep-ph/0105240
|
Yukinari Sumino
|
Y. Sumino
|
Quarkonium Spectroscopy and Perturbative QCD: A New Perspective
|
20 pages, 10 figures, Talk given at ``Accelerator and Particle
Physics Institute (APPI 2001)'', Morioka, Japan, Feb. 20--22, 2001
| null | null |
TU-623
|
hep-ph hep-lat
| null |
We report new aspects of the recent theoretical progress in heavy quarkonium
physics. (1) Contrary to wide beliefs, the gross structure of the bottomonium
spectrum is described well by the non-relativistic boundstate theory based on
perturbative QCD. (2) This leads to a new physical picture of the bottomonium
states: the boundstate mass is composed mainly of the self-energies of b and
bbar accumulated inside the boundstate. (3) A connection to the conventional
phenomenological potential-model approaches is provided.
|
[
{
"created": "Wed, 23 May 2001 07:05:46 GMT",
"version": "v1"
}
] |
2007-05-23
|
[
[
"Sumino",
"Y.",
""
]
] |
We report new aspects of the recent theoretical progress in heavy quarkonium physics. (1) Contrary to wide beliefs, the gross structure of the bottomonium spectrum is described well by the non-relativistic boundstate theory based on perturbative QCD. (2) This leads to a new physical picture of the bottomonium states: the boundstate mass is composed mainly of the self-energies of b and bbar accumulated inside the boundstate. (3) A connection to the conventional phenomenological potential-model approaches is provided.
|
0705.2621
|
Guo-Li Wang
|
Guo-Li Wang
|
Decay constants of $P$-wave mesons
|
11 pages,5 tables,version to be published in Phys. Lett. B
|
Phys.Lett.B650:15-21,2007
|
10.1016/j.physletb.2007.05.001
| null |
hep-ph
| null |
Decay constants of $P$-wave mesons are computed in the framework of
instantaneous Bethe-Salpeter method (Salpeter method). By analyzing the parity
and possible charge conjugation parity, we give the relativistic configurations
of wave functions with definite parity and possible charge conjugation parity.
With these wave functions as input, the full Salpeter equations for different
$P$-wave states are solved, and the mass spectra as well as the numerical
values of wave functions are obtained. Finally we compute the leptonic decay
constants of heavy-heavy and heavy-light $^3P_0$, $^3P_1$ and $^1P_1$ states.
|
[
{
"created": "Fri, 18 May 2007 01:13:39 GMT",
"version": "v1"
}
] |
2008-11-26
|
[
[
"Wang",
"Guo-Li",
""
]
] |
Decay constants of $P$-wave mesons are computed in the framework of instantaneous Bethe-Salpeter method (Salpeter method). By analyzing the parity and possible charge conjugation parity, we give the relativistic configurations of wave functions with definite parity and possible charge conjugation parity. With these wave functions as input, the full Salpeter equations for different $P$-wave states are solved, and the mass spectra as well as the numerical values of wave functions are obtained. Finally we compute the leptonic decay constants of heavy-heavy and heavy-light $^3P_0$, $^3P_1$ and $^1P_1$ states.
|
1605.07188
|
Nicol\'as Bernal Dr.
|
Nicol\'as Bernal, Chee Sheng Fong, Nayara Fonseca
|
Sharing but not Caring: Dark Matter and the Baryon Asymmetry of the
Universe
|
26 pages, 4 figures. v2: version published in JCAP
| null |
10.1088/1475-7516/2016/09/005
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We consider scenarios where Dark Matter (DM) particles carry baryon and/or
lepton numbers, which can be defined if there exist operators connecting the
dark to the visible sector. As a result, the DM fields become intimately linked
to the Standard Model (SM) ones and can be maximally asymmetric just like the
ordinary matter. In particular, we discuss minimal scenarios where the DM is a
complex scalar or a Dirac fermion coupled to operators with nonzero baryon
and/or lepton numbers, and that consist of only SM fields. We consider an
initial asymmetry stored in either the SM or the DM sector; the main role of
these operators is to properly $share$ the asymmetry between the two sectors,
in accordance with observations. After the chemical decoupling, the DM and SM
sectors do $not$ $care$ about each other as there is only an ineffective
communication between them. Once the DM mass is specified, the Wilson
coefficients of these operators are fixed by the requirement of the correct
transfer of the asymmetry. We study the phenomenology of this framework at
colliders, direct detection and indirect detection experiments. In particular,
the LHC phenomenology is very rich and can be tested in different channels such
as the two same-sign leptons with two jets, monojet and monojet with a
monolepton.
|
[
{
"created": "Mon, 23 May 2016 20:00:10 GMT",
"version": "v1"
},
{
"created": "Fri, 2 Sep 2016 14:34:54 GMT",
"version": "v2"
}
] |
2016-09-21
|
[
[
"Bernal",
"Nicolás",
""
],
[
"Fong",
"Chee Sheng",
""
],
[
"Fonseca",
"Nayara",
""
]
] |
We consider scenarios where Dark Matter (DM) particles carry baryon and/or lepton numbers, which can be defined if there exist operators connecting the dark to the visible sector. As a result, the DM fields become intimately linked to the Standard Model (SM) ones and can be maximally asymmetric just like the ordinary matter. In particular, we discuss minimal scenarios where the DM is a complex scalar or a Dirac fermion coupled to operators with nonzero baryon and/or lepton numbers, and that consist of only SM fields. We consider an initial asymmetry stored in either the SM or the DM sector; the main role of these operators is to properly $share$ the asymmetry between the two sectors, in accordance with observations. After the chemical decoupling, the DM and SM sectors do $not$ $care$ about each other as there is only an ineffective communication between them. Once the DM mass is specified, the Wilson coefficients of these operators are fixed by the requirement of the correct transfer of the asymmetry. We study the phenomenology of this framework at colliders, direct detection and indirect detection experiments. In particular, the LHC phenomenology is very rich and can be tested in different channels such as the two same-sign leptons with two jets, monojet and monojet with a monolepton.
|
1802.03244
|
Marta Luszczak Mrs
|
Marta Luszczak, Wolfgang Sch\"afer and Antoni Szczurek
|
Production of $W^+ W^-$ pairs via $\gamma^*\gamma^* \to W^+ W^-$
subprocess with photon transverse momenta
|
20 pages, 17 figures, 2 tables
| null |
10.1007/JHEP05(2018)064
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We discuss production of $W^+ W^-$ pairs in proton-proton collisions induced
by two-photon fusion including, for a first time, transverse momenta of
incoming photons. The unintegrated inelastic fluxes (related to proton
dissociation) of photons are calculated based on modern parametrizations of
deep inelastic structure functions in a broad range of their arguments ($x$ and
$Q^2$). In our approach we can get separate contributions of different $W$
helicities states. Several one- and two-dimensional differential distributions
are shown and discussed. The present results are compared to the results of
previous calculations within collinear factorization approach. Similar results
are found except of some observables such as e.g. transverse momentum of the
pair of $W^+$ and $W^-$. We find large contributions to the cross section from
the region of large photon virtualities. We show decomposition of the total
cross section as well as invariant mass distribution into polarisation states
of both W bosons. The role of the longitudinal $F_L$ structure function is
quantified. Its inclusion leads to a 4-5 % decrease of the cross section,
almost independent of $M_{WW}$.
|
[
{
"created": "Fri, 9 Feb 2018 13:11:01 GMT",
"version": "v1"
},
{
"created": "Mon, 19 Feb 2018 09:10:41 GMT",
"version": "v2"
},
{
"created": "Fri, 23 Mar 2018 14:09:36 GMT",
"version": "v3"
},
{
"created": "Tue, 24 Apr 2018 21:50:24 GMT",
"version": "v4"
}
] |
2018-06-13
|
[
[
"Luszczak",
"Marta",
""
],
[
"Schäfer",
"Wolfgang",
""
],
[
"Szczurek",
"Antoni",
""
]
] |
We discuss production of $W^+ W^-$ pairs in proton-proton collisions induced by two-photon fusion including, for a first time, transverse momenta of incoming photons. The unintegrated inelastic fluxes (related to proton dissociation) of photons are calculated based on modern parametrizations of deep inelastic structure functions in a broad range of their arguments ($x$ and $Q^2$). In our approach we can get separate contributions of different $W$ helicities states. Several one- and two-dimensional differential distributions are shown and discussed. The present results are compared to the results of previous calculations within collinear factorization approach. Similar results are found except of some observables such as e.g. transverse momentum of the pair of $W^+$ and $W^-$. We find large contributions to the cross section from the region of large photon virtualities. We show decomposition of the total cross section as well as invariant mass distribution into polarisation states of both W bosons. The role of the longitudinal $F_L$ structure function is quantified. Its inclusion leads to a 4-5 % decrease of the cross section, almost independent of $M_{WW}$.
|
2112.13218
|
Qin-Tao Song
|
S. Kumano, Qin-Tao Song
|
Equation-of-motion and Lorentz-invariance relations for tensor-polarized
parton distribution functions of spin-1 hadrons
|
5 pages
|
Physics Letters B 826(2022)136908
|
10.1016/j.physletb.2022.136908
|
KEK-TH-2335, J-PARC-TH-0245
|
hep-ph hep-ex hep-lat nucl-th
|
http://creativecommons.org/licenses/by/4.0/
|
Structure functions of polarized spin-1 hadrons will be measured at various
accelerator facilities in the near future. Recently,
transverse-momentum-dependent and collinear parton distribution functions were
theoretically proposed at twist 3 and twist 4 in addition to the twist-2 ones,
so that full investigations became possible for structure functions of spin-1
hadrons in the same level with those of the spin-1/2 nucleons. Furthermore,
twist-3 tensor-polarized multiparton distribution functions were also recently
found for spin-1 hadrons. In this work, we show relations among the collinear
parton- and multiparton-distribution functions for spin-1 hadrons by using
equation of motion for quarks. These relations are valuable in constraining the
distribution functions and learning about multiparton correlations in spin-1
hadrons.
|
[
{
"created": "Sat, 25 Dec 2021 09:39:26 GMT",
"version": "v1"
},
{
"created": "Wed, 26 Jan 2022 18:13:12 GMT",
"version": "v2"
}
] |
2022-01-27
|
[
[
"Kumano",
"S.",
""
],
[
"Song",
"Qin-Tao",
""
]
] |
Structure functions of polarized spin-1 hadrons will be measured at various accelerator facilities in the near future. Recently, transverse-momentum-dependent and collinear parton distribution functions were theoretically proposed at twist 3 and twist 4 in addition to the twist-2 ones, so that full investigations became possible for structure functions of spin-1 hadrons in the same level with those of the spin-1/2 nucleons. Furthermore, twist-3 tensor-polarized multiparton distribution functions were also recently found for spin-1 hadrons. In this work, we show relations among the collinear parton- and multiparton-distribution functions for spin-1 hadrons by using equation of motion for quarks. These relations are valuable in constraining the distribution functions and learning about multiparton correlations in spin-1 hadrons.
|
hep-ph/0608270
|
Berndt Muller
|
Masayuki Asakawa, Steffen A. Bass, and Berndt M\"uller
|
Anomalous Transport Processes in Anisotropically Expanding Quark-Gluon
Plasmas
|
31 pages, 1 figure, some typos in published version are corrected
|
Prog.Theor.Phys.116:725-755,2007
|
10.1143/PTP.116.725
| null |
hep-ph nucl-th
| null |
We derive an expression for the anomalous viscosity in an anisotropically
expanding quark-gluon-plasma, which arises from interactions of thermal partons
with dynamically generated color fields. The anomalous viscosity dominates over
the collisional viscosity for large velocity gradients or weak coupling. This
effect may provide an explanation for the apparent ``nearly perfect'' liquidity
of the matter produced in nuclear collisions at RHIC without the assumption
that it is a strongly coupled state.
|
[
{
"created": "Thu, 24 Aug 2006 02:18:51 GMT",
"version": "v1"
},
{
"created": "Thu, 23 Nov 2006 09:06:02 GMT",
"version": "v2"
}
] |
2008-11-26
|
[
[
"Asakawa",
"Masayuki",
""
],
[
"Bass",
"Steffen A.",
""
],
[
"Müller",
"Berndt",
""
]
] |
We derive an expression for the anomalous viscosity in an anisotropically expanding quark-gluon-plasma, which arises from interactions of thermal partons with dynamically generated color fields. The anomalous viscosity dominates over the collisional viscosity for large velocity gradients or weak coupling. This effect may provide an explanation for the apparent ``nearly perfect'' liquidity of the matter produced in nuclear collisions at RHIC without the assumption that it is a strongly coupled state.
|
0709.4427
|
Shang-Yung Wang
|
S.-Y. Wang
|
Dynamical Electron Mass in a Strong Magnetic Field
|
5 pages, 1 figure, published version
|
Phys.Rev.D77:025031,2008
|
10.1103/PhysRevD.77.025031
| null |
hep-ph astro-ph
| null |
Motivated by recent interest in understanding properties of strongly
magnetized matter, we study the dynamical electron mass generated through
approximate chiral symmetry breaking in QED in a strong magnetic field. We
reliably calculate the dynamical electron mass by numerically solving the
nonperturbative Schwinger-Dyson equations in a consistent truncation within the
lowest Landau level approximation. It is shown that the generation of dynamical
electron mass in a strong magnetic field is significantly enhanced by the
perturbative electron mass that explicitly breaks chiral symmetry in the
absence of a magnetic field.
|
[
{
"created": "Thu, 27 Sep 2007 15:23:19 GMT",
"version": "v1"
},
{
"created": "Thu, 20 Dec 2007 05:41:11 GMT",
"version": "v2"
},
{
"created": "Mon, 28 Jan 2008 15:09:27 GMT",
"version": "v3"
}
] |
2008-11-26
|
[
[
"Wang",
"S. -Y.",
""
]
] |
Motivated by recent interest in understanding properties of strongly magnetized matter, we study the dynamical electron mass generated through approximate chiral symmetry breaking in QED in a strong magnetic field. We reliably calculate the dynamical electron mass by numerically solving the nonperturbative Schwinger-Dyson equations in a consistent truncation within the lowest Landau level approximation. It is shown that the generation of dynamical electron mass in a strong magnetic field is significantly enhanced by the perturbative electron mass that explicitly breaks chiral symmetry in the absence of a magnetic field.
|
1010.5392
|
Hannu Paukkunen
|
Hannu Paukkunen and Carlos A. Salgado
|
Constraints for the nuclear parton distributions from Z and W production
at the LHC
|
The version accepted for publication in JHEP. New figures has been
added, and we also discuss the single charged lepton production
|
JHEP 1103:071,2011
|
10.1007/JHEP03(2011)071
| null |
hep-ph hep-ex
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
The LHC is foreseen to finally bring also the nuclear collisions to the TeV
scale thereby providing new possibilities for physics studies, in particular
related to the electro-weak sector of the Standard Model. We study here the Z
and W production in proton-lead and lead-lead collisions at the LHC,
concentrating on the prospects of testing the factorization and constraining
the nuclear modifications of the parton distribution functions (PDFs).
Especially, we find that the rapidity asymmetries in proton-nucleus collisions,
arising from the differences in the PDFs between the colliding objects, provide
a decisive advantage in comparison to the rapidity-symmetric nucleus-nucleus
case. We comment on how such studies will help to improve our knowledge of the
nuclear PDFs.
|
[
{
"created": "Tue, 26 Oct 2010 13:34:57 GMT",
"version": "v1"
},
{
"created": "Fri, 11 Mar 2011 10:47:19 GMT",
"version": "v2"
}
] |
2015-03-17
|
[
[
"Paukkunen",
"Hannu",
""
],
[
"Salgado",
"Carlos A.",
""
]
] |
The LHC is foreseen to finally bring also the nuclear collisions to the TeV scale thereby providing new possibilities for physics studies, in particular related to the electro-weak sector of the Standard Model. We study here the Z and W production in proton-lead and lead-lead collisions at the LHC, concentrating on the prospects of testing the factorization and constraining the nuclear modifications of the parton distribution functions (PDFs). Especially, we find that the rapidity asymmetries in proton-nucleus collisions, arising from the differences in the PDFs between the colliding objects, provide a decisive advantage in comparison to the rapidity-symmetric nucleus-nucleus case. We comment on how such studies will help to improve our knowledge of the nuclear PDFs.
|
hep-ph/0001012
|
Mohamed Tarek Hussein
|
M. T. Hussein, R. Elmualed and N. M. Hassan
|
Electron - Proton Scattering as a Probe of Nucleon Structure
|
6 pages (revtex), 8 figures/gif
|
26th ICRC(1999) Utah Univ. USA, HE.1.3.29
| null | null |
hep-ph
| null |
The problem of electron-proton scattering is handed over both the elastic and
inelastic scattering. Two models are presented in this sense. The first,
depends on the multi photon exchange ladder diagram, where the transition
matrix is expanded in multi steps form. The second model uses the multi
peripheral mechanism developed for the electromagnetic field. It allows the
particle production in the inelastic scattering processes. An iterative
procedure is found and inserted in a Monte Carlo program to reproduce the
differential cross section of the reaction. The comparison with the
experimental data shows bid fair in most cases.
|
[
{
"created": "Mon, 3 Jan 2000 11:20:31 GMT",
"version": "v1"
}
] |
2007-05-23
|
[
[
"Hussein",
"M. T.",
""
],
[
"Elmualed",
"R.",
""
],
[
"Hassan",
"N. M.",
""
]
] |
The problem of electron-proton scattering is handed over both the elastic and inelastic scattering. Two models are presented in this sense. The first, depends on the multi photon exchange ladder diagram, where the transition matrix is expanded in multi steps form. The second model uses the multi peripheral mechanism developed for the electromagnetic field. It allows the particle production in the inelastic scattering processes. An iterative procedure is found and inserted in a Monte Carlo program to reproduce the differential cross section of the reaction. The comparison with the experimental data shows bid fair in most cases.
|
2110.14015
|
Ignacio Borsa Sanjuan
|
Ignacio Borsa, Daniel de Florian, Rodolfo Sassot, Marco Stratmann
|
Pion Fragmentation Functions at High Energy Colliders
|
5 pages, 6 figures
| null |
10.1103/PhysRevD.105.L031502
| null |
hep-ph hep-ex
|
http://creativecommons.org/licenses/by/4.0/
|
We revisit the description of pion production in proton-proton collisions in
the light of the very precise data taken at the Large Hadron Collider (LHC)
over the past decade. First attempts to include LHC results in next-to-leading
order global QCD analyses of parton-to-pion fragmentation functions insinuated
some conflict between data sets at different center-of-mass system energies. We
show that the data can be well described within their uncertainties by a
consistent set of pion fragmentation functions once the theoretical scale
dependence is taken into account in the global QCD analysis.
|
[
{
"created": "Tue, 26 Oct 2021 20:43:47 GMT",
"version": "v1"
}
] |
2022-02-23
|
[
[
"Borsa",
"Ignacio",
""
],
[
"de Florian",
"Daniel",
""
],
[
"Sassot",
"Rodolfo",
""
],
[
"Stratmann",
"Marco",
""
]
] |
We revisit the description of pion production in proton-proton collisions in the light of the very precise data taken at the Large Hadron Collider (LHC) over the past decade. First attempts to include LHC results in next-to-leading order global QCD analyses of parton-to-pion fragmentation functions insinuated some conflict between data sets at different center-of-mass system energies. We show that the data can be well described within their uncertainties by a consistent set of pion fragmentation functions once the theoretical scale dependence is taken into account in the global QCD analysis.
|
hep-ph/0110261
|
Harold W. Fearing
|
T. Ebertsh\"auser, H. W. Fearing, S. Scherer
|
The anomalous chiral perturbation theory meson Lagrangian to order $p^6$
revisited
|
21 pages, Latex, using RevTeX
|
Phys.Rev. D65 (2002) 054033
|
10.1103/PhysRevD.65.054033
|
MKPH-T-01-22, TRI-PP-01-34
|
hep-ph
| null |
We present a revised and extended construction of the mesonic Lagrangian
density in chiral perturbation theory (ChPT) at order $p^6$ in the anomalous
(or epsilon) sector, ${\cal{L}}_{6,\epsilon}$. After improving several aspects
of the strategy we used originally, i.e., a more efficient application of
partial integration, the implementation of so-called Bianchi identities, and
additional trace relations, we find the new monomial sets to include 24
$SU(N_f)$, 23 SU(3), and 5 SU(2) elements. Furthermore, we introduce 8
supplementary terms due to the extension of the chiral group to $SU(N_f)_L
\times SU(N_f)_R \times U(1)_V$.
|
[
{
"created": "Thu, 18 Oct 2001 18:47:12 GMT",
"version": "v1"
}
] |
2009-11-07
|
[
[
"Ebertshäuser",
"T.",
""
],
[
"Fearing",
"H. W.",
""
],
[
"Scherer",
"S.",
""
]
] |
We present a revised and extended construction of the mesonic Lagrangian density in chiral perturbation theory (ChPT) at order $p^6$ in the anomalous (or epsilon) sector, ${\cal{L}}_{6,\epsilon}$. After improving several aspects of the strategy we used originally, i.e., a more efficient application of partial integration, the implementation of so-called Bianchi identities, and additional trace relations, we find the new monomial sets to include 24 $SU(N_f)$, 23 SU(3), and 5 SU(2) elements. Furthermore, we introduce 8 supplementary terms due to the extension of the chiral group to $SU(N_f)_L \times SU(N_f)_R \times U(1)_V$.
|
2201.02576
|
Johann Usovitsch
|
Ievgen Dubovyk, Ayres Freitas, Janusz Gluza, Krzysztof Grzanka,
Martijn Hidding, Johann Usovitsch
|
Evaluation of multi-loop multi-scale Feynman integrals for precision
physics
| null | null |
10.1103/PhysRevD.106.L111301
|
CERN-TH-2021-230, UUITP-66/21
|
hep-ph
|
http://creativecommons.org/licenses/by/4.0/
|
Modern particle physics is increasingly becoming a precision science that
relies on advanced theoretical predictions for the analysis and interpretation
of experimental results. The planned physics program at the LHC and future
colliders will require three-loop electroweak and mixed electroweak-QCD
corrections to single-particle production and decay processes and two-loop
electroweak corrections to pair production processes, all of which are beyond
the reach of existing analytical and numerical techniques in their current
form. This article presents a new semi-numerical approach based on differential
equations with boundary terms specified at Euclidean kinematic points. These
Euclidean boundary terms can be computed numerically with high accuracy using
sector decomposition or other numerical methods. They are then mapped to the
physical kinematic configuration with a series solution of the differential
equation system. The method is able to deliver 8 or more digits precision, and
it has a built-in mechanism for checking the accuracy of the obtained results.
Its efficacy is illustrated with examples for three-loop self-energy and vertex
integrals and two-loop box integrals.
|
[
{
"created": "Fri, 7 Jan 2022 18:16:22 GMT",
"version": "v1"
},
{
"created": "Wed, 26 Jan 2022 18:30:59 GMT",
"version": "v2"
}
] |
2023-01-04
|
[
[
"Dubovyk",
"Ievgen",
""
],
[
"Freitas",
"Ayres",
""
],
[
"Gluza",
"Janusz",
""
],
[
"Grzanka",
"Krzysztof",
""
],
[
"Hidding",
"Martijn",
""
],
[
"Usovitsch",
"Johann",
""
]
] |
Modern particle physics is increasingly becoming a precision science that relies on advanced theoretical predictions for the analysis and interpretation of experimental results. The planned physics program at the LHC and future colliders will require three-loop electroweak and mixed electroweak-QCD corrections to single-particle production and decay processes and two-loop electroweak corrections to pair production processes, all of which are beyond the reach of existing analytical and numerical techniques in their current form. This article presents a new semi-numerical approach based on differential equations with boundary terms specified at Euclidean kinematic points. These Euclidean boundary terms can be computed numerically with high accuracy using sector decomposition or other numerical methods. They are then mapped to the physical kinematic configuration with a series solution of the differential equation system. The method is able to deliver 8 or more digits precision, and it has a built-in mechanism for checking the accuracy of the obtained results. Its efficacy is illustrated with examples for three-loop self-energy and vertex integrals and two-loop box integrals.
|
hep-ph/9806506
|
Georg Raffelt
|
G.Raffelt (MPP, Munich)
|
Axion Hunting at the Turn of the Millenium
|
6 pages, 4 eps figs, to be published in Proc. Neutrino 98, 4-9 June
1998, Takayama, Japan, ed. by Y.Suzuki and Y.Totsuka
|
Nucl.Phys.Proc.Suppl. 77 (1999) 456-461
|
10.1016/S0920-5632(99)00467-3
| null |
hep-ph
| null |
The status of several current and proposed experiments to search for galactic
dark-matter and solar axions is reviewed in the light of astrophysical and
cosmological limits on the Peccei-Quinn scale.
|
[
{
"created": "Sat, 27 Jun 1998 12:12:42 GMT",
"version": "v1"
}
] |
2009-10-31
|
[
[
"Raffelt",
"G.",
"",
"MPP, Munich"
]
] |
The status of several current and proposed experiments to search for galactic dark-matter and solar axions is reviewed in the light of astrophysical and cosmological limits on the Peccei-Quinn scale.
|
0906.0368
|
Alexandre Arbey
|
A. Arbey and F. Mahmoudi
|
SUSY Constraints, Relic Density, and Very Early Universe
|
11 pages, 5 figures. v2: new figures added
|
JHEP 1005:051,2010
|
10.1007/JHEP05(2010)051
| null |
hep-ph astro-ph.CO astro-ph.HE
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
The sensitivity of the lightest supersymmetric particle relic density
calculation to different cosmological scenarios is discussed. In particular, we
investigate the effects of modifications of the expansion rate and of the
entropy content in the Early Universe. These effects, even with no
observational consequences, can still drastically modify the relic density
constraints on the SUSY parameter space. We suggest general parametrizations to
evaluate such effects, and derive also constraints from Big-Bang
nucleosynthesis. We show that using the relic density in the context of
supersymmetric constraints requires a clear statement of the underlying
cosmological model assumptions to avoid misinterpretations. On the other hand,
we note that combining the relic density calculation with the eventual future
discoveries at the LHC will hopefully shed light on the Very Early Universe
properties.
|
[
{
"created": "Tue, 2 Jun 2009 15:15:27 GMT",
"version": "v1"
},
{
"created": "Tue, 6 Jul 2010 13:46:14 GMT",
"version": "v2"
}
] |
2010-07-07
|
[
[
"Arbey",
"A.",
""
],
[
"Mahmoudi",
"F.",
""
]
] |
The sensitivity of the lightest supersymmetric particle relic density calculation to different cosmological scenarios is discussed. In particular, we investigate the effects of modifications of the expansion rate and of the entropy content in the Early Universe. These effects, even with no observational consequences, can still drastically modify the relic density constraints on the SUSY parameter space. We suggest general parametrizations to evaluate such effects, and derive also constraints from Big-Bang nucleosynthesis. We show that using the relic density in the context of supersymmetric constraints requires a clear statement of the underlying cosmological model assumptions to avoid misinterpretations. On the other hand, we note that combining the relic density calculation with the eventual future discoveries at the LHC will hopefully shed light on the Very Early Universe properties.
|
1404.5195
|
Oscar Castillo Felisola Dr.
|
Oscar Castillo-Felisola and Cristobal Corral and Ivan Schmidt and
Alfonso R. Zerwekh
|
Updated limits on extra dimensions through torsion and LHC data
|
10 pages. Accepted for publication on Mod. Phys. Lett. A. arXiv admin
note: substantial text overlap with arXiv:1211.4359
|
Mod. Phys. Lett. A 29, 1450081 (2014)
|
10.1142/S0217732314500813
| null |
hep-ph hep-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
It is well known that inclusion of torsion in the gravitational formalism,
leads to four-fermion interactions. Although the coupling constant of this
interaction is strongly suppressed in four dimensions, its value is enhanced in
models with $n$ extra dimensions. In this context, we reinterpret the recent
limits established by LHC experiments to four-fermion contact interactions, to
set bounds on the size of the extra dimensions. For $n=2$, the limits are
comparable to those in the literature, while for $n\ge 3$ the volume of the
extra dimensions is strongly constrained.
|
[
{
"created": "Mon, 21 Apr 2014 13:51:21 GMT",
"version": "v1"
}
] |
2014-05-27
|
[
[
"Castillo-Felisola",
"Oscar",
""
],
[
"Corral",
"Cristobal",
""
],
[
"Schmidt",
"Ivan",
""
],
[
"Zerwekh",
"Alfonso R.",
""
]
] |
It is well known that inclusion of torsion in the gravitational formalism, leads to four-fermion interactions. Although the coupling constant of this interaction is strongly suppressed in four dimensions, its value is enhanced in models with $n$ extra dimensions. In this context, we reinterpret the recent limits established by LHC experiments to four-fermion contact interactions, to set bounds on the size of the extra dimensions. For $n=2$, the limits are comparable to those in the literature, while for $n\ge 3$ the volume of the extra dimensions is strongly constrained.
|
2302.01372
|
Eric S. Swanson
|
E.S. Swanson
|
Light Hybrid Meson Mixing and Phenomenology
|
16 pages, 7 figures
| null |
10.1103/PhysRevD.107.074028
| null |
hep-ph hep-ex
|
http://creativecommons.org/licenses/by/4.0/
|
A simple constituent model of gluodynamics that is motivated by lattice field
theory and the QCD Hamiltonian in Coulomb gauge is applied to descriptions of
hybrid meson flavor mixing and vector hybrid configuration mixing. Good
agreement with lattice gauge computations is obtained for flavor multiplet
masses, while mixing angles are in approximate agreement, given large errors.
The configuration mixing results are also in rough agreement with lattice NRQCD
calculations. Thus the viability of constituent gluon models of hybrid hadrons
and glueballs is supported. The results suggest that a flavor multiplet of
vector hybrids should appear with masses of approximately 2100, 2200, and 2300
MeV and that the isovector vector hybrid decay constant is about 20 MeV.
Similarly, the $\pi_1$ exotic hybrid should have isospin partner states near
1760 and 1900 MeV, and it is suggested that the recently seen $\eta_1$ hybrid
signal is the latter state.
|
[
{
"created": "Thu, 2 Feb 2023 19:16:25 GMT",
"version": "v1"
}
] |
2023-05-03
|
[
[
"Swanson",
"E. S.",
""
]
] |
A simple constituent model of gluodynamics that is motivated by lattice field theory and the QCD Hamiltonian in Coulomb gauge is applied to descriptions of hybrid meson flavor mixing and vector hybrid configuration mixing. Good agreement with lattice gauge computations is obtained for flavor multiplet masses, while mixing angles are in approximate agreement, given large errors. The configuration mixing results are also in rough agreement with lattice NRQCD calculations. Thus the viability of constituent gluon models of hybrid hadrons and glueballs is supported. The results suggest that a flavor multiplet of vector hybrids should appear with masses of approximately 2100, 2200, and 2300 MeV and that the isovector vector hybrid decay constant is about 20 MeV. Similarly, the $\pi_1$ exotic hybrid should have isospin partner states near 1760 and 1900 MeV, and it is suggested that the recently seen $\eta_1$ hybrid signal is the latter state.
|
2308.08612
|
Felix Yu
|
Felix Yu
|
Primer on Axion Physics
|
15 pages, 1 figure; invited contribution to Annalen der Physik
|
Ann. Phys.(Berlin) 2023, 2300106
|
10.1002/andp.202300106
|
MITP-23-038
|
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
I review the canonical axion potential, with an emphasis on the field theory
underlying radial and angular modes of complex scalar fields. I present the
explicit calculation of the instanton-induced breaking of the Goldstone field
direction necessary to derive the canonical axion mass and decay constant
relation. The primer is intended to serve an audience with elementary quantum
field theory expertise.
|
[
{
"created": "Wed, 16 Aug 2023 18:06:50 GMT",
"version": "v1"
}
] |
2023-10-10
|
[
[
"Yu",
"Felix",
""
]
] |
I review the canonical axion potential, with an emphasis on the field theory underlying radial and angular modes of complex scalar fields. I present the explicit calculation of the instanton-induced breaking of the Goldstone field direction necessary to derive the canonical axion mass and decay constant relation. The primer is intended to serve an audience with elementary quantum field theory expertise.
|
hep-ph/0510297
|
Alexander E. Dorokhov
|
A.E. Dorokhov
|
Hadronic corrections to muon anomalous magnetic moment within the
instanton liquid model
|
32 pages, 17 figures. Presented at The Cracow School of Theoretical
Physics, XLV Course,Zakopane june 2005. To appear in Acta Physica Polonica
|
Acta Phys.Polon. B36 (2005) 3751-3782
| null | null |
hep-ph
| null |
The current status of the muon anomalous magnetic moment problem is briefly
presented. The corrections to muon anomaly coming from the effects of hadronic
vacuum polarization, Z*\gamma\gamma* effective vertex and light-by-light
scattering are estimated within the instanton model of QCD vacuum.
|
[
{
"created": "Sat, 22 Oct 2005 09:40:00 GMT",
"version": "v1"
}
] |
2007-05-23
|
[
[
"Dorokhov",
"A. E.",
""
]
] |
The current status of the muon anomalous magnetic moment problem is briefly presented. The corrections to muon anomaly coming from the effects of hadronic vacuum polarization, Z*\gamma\gamma* effective vertex and light-by-light scattering are estimated within the instanton model of QCD vacuum.
|
1505.00513
|
Natsumi Nagata
|
Jason L. Evans and Natsumi Nagata
|
Signatures of Leptoquarks at the LHC and Right-handed Neutrinos
|
25 pages, 2 figures
|
Phys. Rev. D 92, 015022 (2015)
|
10.1103/PhysRevD.92.015022
|
FTPI-MINN-15/20, UMN-TH-3433/15, IPMU15-0063
|
hep-ph hep-ex
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
In this paper, we argue that an extension of the Standard Model with a single
leptoquark and three right-handed neutrinos can explain the excess in the
first-generation leptoquark search at the LHC. We also find that when the
leptoquark has similarly sized couplings to all three generations, it produces
additional signals which will soon be tested in the second- and
third-generation leptoquark searches, as well as in decay channels consisting
of two mixed flavor leptons and two jets. If the leptoquark only couples to the
first generation, on the other hand, two of the right-handed neutrinos need to
be fairly degenerate in mass with the leptoquark while the other right-handed
neutrinos mass should be much lighter. This hierarchical structure could
explain dark matter and the baryon asymmetry of the Universe. These simple
models may be regarded as benchmark models for explaining the excess, which can
be tested in the next stage of the LHC running.
|
[
{
"created": "Mon, 4 May 2015 02:24:27 GMT",
"version": "v1"
},
{
"created": "Wed, 22 Jul 2015 19:18:01 GMT",
"version": "v2"
}
] |
2015-07-23
|
[
[
"Evans",
"Jason L.",
""
],
[
"Nagata",
"Natsumi",
""
]
] |
In this paper, we argue that an extension of the Standard Model with a single leptoquark and three right-handed neutrinos can explain the excess in the first-generation leptoquark search at the LHC. We also find that when the leptoquark has similarly sized couplings to all three generations, it produces additional signals which will soon be tested in the second- and third-generation leptoquark searches, as well as in decay channels consisting of two mixed flavor leptons and two jets. If the leptoquark only couples to the first generation, on the other hand, two of the right-handed neutrinos need to be fairly degenerate in mass with the leptoquark while the other right-handed neutrinos mass should be much lighter. This hierarchical structure could explain dark matter and the baryon asymmetry of the Universe. These simple models may be regarded as benchmark models for explaining the excess, which can be tested in the next stage of the LHC running.
|
1402.4817
|
Andrew Spray
|
David E. Morrissey and Andrew Paul Spray
|
New Limits on Light Hidden Sectors from Fixed-Target Experiments
|
44 pages + appendices/references, 28 figures. Figures in secs 5 and 7
updated to correct error in hadronic exclusions; limits slightly weaker, but
qualitative conclusions unchanged
|
JHEP 1406 (2014) 083
|
10.1007/JHEP06(2014)083
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
New physics can be light if it is hidden, coupling very weakly to the
Standard Model. In this work we investigate the discovery prospects of Abelian
hidden sectors in lower-energy fixed-target and high-precision experiments. We
focus on a minimal supersymmetric realization consisting of an Abelian vector
multiplet, coupled to hypercharge by kinetic mixing, and a pair of chiral Higgs
multiplets. This simple theory can give rise to a broad range of experimental
signals, including both commonly-studied patterns of hidden vector decay as
well as new and distinctive hidden sector cascades. We find limits from the
production of hidden states other than the vector itself. In particular, we
show that if the hidden Abelian symmetry is higgsed, and the corresponding
hidden Higgs boson has visible decays, it severely restricts the ability of the
hidden sector to explain the anomalous muon magnetic moment.
|
[
{
"created": "Wed, 19 Feb 2014 21:00:24 GMT",
"version": "v1"
},
{
"created": "Thu, 27 Feb 2014 09:13:08 GMT",
"version": "v2"
},
{
"created": "Thu, 26 Mar 2015 00:44:25 GMT",
"version": "v3"
},
{
"created": "Sun, 29 Mar 2015 01:27:33 GMT",
"version": "v4"
}
] |
2015-03-31
|
[
[
"Morrissey",
"David E.",
""
],
[
"Spray",
"Andrew Paul",
""
]
] |
New physics can be light if it is hidden, coupling very weakly to the Standard Model. In this work we investigate the discovery prospects of Abelian hidden sectors in lower-energy fixed-target and high-precision experiments. We focus on a minimal supersymmetric realization consisting of an Abelian vector multiplet, coupled to hypercharge by kinetic mixing, and a pair of chiral Higgs multiplets. This simple theory can give rise to a broad range of experimental signals, including both commonly-studied patterns of hidden vector decay as well as new and distinctive hidden sector cascades. We find limits from the production of hidden states other than the vector itself. In particular, we show that if the hidden Abelian symmetry is higgsed, and the corresponding hidden Higgs boson has visible decays, it severely restricts the ability of the hidden sector to explain the anomalous muon magnetic moment.
|
hep-ph/0206027
|
Volodymyr Magas
|
R. Fiore, A. Flachi, L.L. Jenkovszky, A.I. Lengyel, V.K. Magas
|
Explicit model realizing parton-hadron duality
|
29 pages, 7 figures
|
Eur.Phys.J. A15 (2002) 505-515
| null | null |
hep-ph
| null |
An explicit model realizing parton-hadron duality and fitting the data is
suggested. Complex nonlinear Regge trajectories are important ingredients of
the model. The inclusion of $\Delta$ and $N^*$ trajectories should account for
all resonances in the direct channel. The exotic trajectory is responsible for
the smooth background.
|
[
{
"created": "Tue, 4 Jun 2002 12:24:35 GMT",
"version": "v1"
}
] |
2007-05-23
|
[
[
"Fiore",
"R.",
""
],
[
"Flachi",
"A.",
""
],
[
"Jenkovszky",
"L. L.",
""
],
[
"Lengyel",
"A. I.",
""
],
[
"Magas",
"V. K.",
""
]
] |
An explicit model realizing parton-hadron duality and fitting the data is suggested. Complex nonlinear Regge trajectories are important ingredients of the model. The inclusion of $\Delta$ and $N^*$ trajectories should account for all resonances in the direct channel. The exotic trajectory is responsible for the smooth background.
|
0910.2852
|
Dario Schalla
|
E. A. Paschos, Dario Schalla
|
Coherent Pion Production by Neutrinos
|
5 pages, 7 figures, Proceedings of the Sixth International Workshop
on Neutrino-Nucleus Interactions in the Few-GeV Region (NuInt09), May 18-22,
Sitges, Barcelona, Spain
| null |
10.1063/1.3274158
|
DO-TH-09/16
|
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
In this talk I review the main features of the coherent/diffractive pion
production by neutrinos on nuclei. The method is based on PCAC and relates the
reaction $\textbf{boson} + \textbf{nucleus} \to \textbf{pion} +
\textbf{nucleus}$ to elastic pion-nucleus scattering. Estimates for the
expected rates and distributions in neutrino reactions are presented with the
help of hadronic data. The absolute rates are significantly smaller than the
older estimates which brings theory in agreement with the neutral current
measurements and the bounds in charged current reactions.
|
[
{
"created": "Thu, 15 Oct 2009 12:31:43 GMT",
"version": "v1"
}
] |
2015-05-14
|
[
[
"Paschos",
"E. A.",
""
],
[
"Schalla",
"Dario",
""
]
] |
In this talk I review the main features of the coherent/diffractive pion production by neutrinos on nuclei. The method is based on PCAC and relates the reaction $\textbf{boson} + \textbf{nucleus} \to \textbf{pion} + \textbf{nucleus}$ to elastic pion-nucleus scattering. Estimates for the expected rates and distributions in neutrino reactions are presented with the help of hadronic data. The absolute rates are significantly smaller than the older estimates which brings theory in agreement with the neutral current measurements and the bounds in charged current reactions.
|
1402.3991
|
Tim Ledwig
|
L. Alvarez-Ruso, T. Ledwig, J. Martin-Camalich, M.J. Vicente Vacas
|
The nucleon mass and pion-nucleon sigma term from a chiral analysis of
Nf = 2+1 lattice QCD world data
|
Contribution to the NSTAR 2013 conference, 4 pages, 4 figures
| null |
10.1051/epjconf/20146606001
| null |
hep-ph hep-lat
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Fits of the p^4 covariant SU(2) baryon chiral perturbation theory to lattice
QCD nucleon mass data from several collaborations for 2 and 2+1 flavors are
presented. We consider contributions from explicit Delta(1232) degrees of
freedom, finite volume and finite spacing corrections. We emphasize here our
Nf=2+1 study. We obtain low-energy constants of natural size that are
compatible with the rather linear pion-mass dependence of the nucleon mass
observed in lattice QCD. We report a value for the pion-nucleon sigma term of
41(5)(4) MeV for the 2 flavor case and 52(3)(8) MeV for 2+1 flavors.
|
[
{
"created": "Mon, 17 Feb 2014 13:14:18 GMT",
"version": "v1"
}
] |
2015-06-18
|
[
[
"Alvarez-Ruso",
"L.",
""
],
[
"Ledwig",
"T.",
""
],
[
"Martin-Camalich",
"J.",
""
],
[
"Vacas",
"M. J. Vicente",
""
]
] |
Fits of the p^4 covariant SU(2) baryon chiral perturbation theory to lattice QCD nucleon mass data from several collaborations for 2 and 2+1 flavors are presented. We consider contributions from explicit Delta(1232) degrees of freedom, finite volume and finite spacing corrections. We emphasize here our Nf=2+1 study. We obtain low-energy constants of natural size that are compatible with the rather linear pion-mass dependence of the nucleon mass observed in lattice QCD. We report a value for the pion-nucleon sigma term of 41(5)(4) MeV for the 2 flavor case and 52(3)(8) MeV for 2+1 flavors.
|
0903.3358
|
Andrey Lobanov
|
E. V. Arbuzova, A. E. Lobanov, E. M. Murchikova
|
Pure quantum states of a neutrino with rotating spin in dense magnetized
matter
|
21 pages, Latex. Final version
|
Phys.Rev.D81:045001,2010
|
10.1103/PhysRevD.81.045001
| null |
hep-ph hep-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
The problem of neutrino spin rotation in dense matter and in strong
electromagnetic fields is solved in accordance with the basic principles of
quantum mechanics. We obtain a complete system of wave functions for a massive
Dirac neutrino with an anomalous magnetic moment which are the eigenfunctions
of the kinetic momentum operator and have the form of nonspreading wave
packets. These wave functions enable one to consider the states of neutrino
with rotating spin as pure quantum states and can be used for calculating
probabilities of various processes with the neutrino in the framework of the
Furry picture.
|
[
{
"created": "Thu, 19 Mar 2009 16:26:23 GMT",
"version": "v1"
},
{
"created": "Mon, 20 Apr 2009 21:14:22 GMT",
"version": "v2"
},
{
"created": "Mon, 1 Feb 2010 23:37:18 GMT",
"version": "v3"
}
] |
2010-04-06
|
[
[
"Arbuzova",
"E. V.",
""
],
[
"Lobanov",
"A. E.",
""
],
[
"Murchikova",
"E. M.",
""
]
] |
The problem of neutrino spin rotation in dense matter and in strong electromagnetic fields is solved in accordance with the basic principles of quantum mechanics. We obtain a complete system of wave functions for a massive Dirac neutrino with an anomalous magnetic moment which are the eigenfunctions of the kinetic momentum operator and have the form of nonspreading wave packets. These wave functions enable one to consider the states of neutrino with rotating spin as pure quantum states and can be used for calculating probabilities of various processes with the neutrino in the framework of the Furry picture.
|
2105.00217
|
Jens Erler
|
Jens Erler
|
Global Vision of Precision Measurements
|
6 pages, 10 figures, contributions to Les Rencontres de Physique de
la Vall\'ee d'Aoste (La Thuile 2021), March 9--11, 2021; and to the 2021 EW
session of the 55th Rencontres de Moriond, March 21--27, 2021
| null | null |
MITP/21-022
|
hep-ph hep-ex nucl-ex
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
I summarize recent developments in electroweak precision physics and global
fits. Expectations for future measurements, both at lower energies and the
energy frontier, are also discussed.
|
[
{
"created": "Sat, 1 May 2021 11:21:29 GMT",
"version": "v1"
}
] |
2021-05-05
|
[
[
"Erler",
"Jens",
""
]
] |
I summarize recent developments in electroweak precision physics and global fits. Expectations for future measurements, both at lower energies and the energy frontier, are also discussed.
|
1311.6726
|
Yuri Goncharov
|
Yu. P. Goncharov and F. F. Pavlov
|
Estimates for Parameters and Characteristics of the Confining
SU(3)-gluonic Field in $\phi$-meson from Leptonic Widths
|
11 pages in LaTeX. arXiv admin note: substantial text overlap with
arXiv:1010.1562, arXiv:1201.4327, arXiv:hep-ph/0609135
|
Few-Body Syst. (2014), Vol. 55, No. 1, pp. 35-45
|
10.1007/s00601-013-0730-1
| null |
hep-ph nucl-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
The paper is devoted to applying the confinement mechanism proposed earlier
by one of the authors to estimate the possible parameters of the confining
SU(3)-gluonic field in vector $\phi$-meson. The estimates obtained are
consistent with the leptonic widths of the given meson. The corresponding
estimates of the gluon concentrations, electric and magnetic colour field
strengths are also adduced for the mentioned field at the scales of the meson
under consideration.
|
[
{
"created": "Tue, 26 Nov 2013 16:24:23 GMT",
"version": "v1"
}
] |
2014-01-09
|
[
[
"Goncharov",
"Yu. P.",
""
],
[
"Pavlov",
"F. F.",
""
]
] |
The paper is devoted to applying the confinement mechanism proposed earlier by one of the authors to estimate the possible parameters of the confining SU(3)-gluonic field in vector $\phi$-meson. The estimates obtained are consistent with the leptonic widths of the given meson. The corresponding estimates of the gluon concentrations, electric and magnetic colour field strengths are also adduced for the mentioned field at the scales of the meson under consideration.
|
1401.3099
|
Shotaro Imai
|
Shotaro Imai and Hideo Suganuma
|
A non-perturbative effect of gluons for scalar diquark in the
Schwinger-Dyson formalism
|
5 pages, 5 figures, Contribution of proceedings of XV International
Conference on Hadron Spectroscopy-Hadron 2013 (Hadron 2013)
| null | null | null |
hep-ph nucl-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
The diquark has been considered to be important effective degrees of freedom
in hadron physics, especially for multi-quark physics and the structure of
heavy hadronic states. Using the Schwinger-Dyson formalism, we investigate the
non-perturbative effect of gluons for scalar diquarks with
renormalization-group improved coupling in the Landau gauge. Here, we treat the
scalar diquark as an effective degree of freedom with a peculiar size, while
the diquark is originally a bound-state-like object of two quarks. Since the
diquark has a non-zero color charge, it strongly interacts with gluons. We
evaluate the gluonic non-perturbative effect to the diquark, considering the
size effect of the diquark. We investigate the mass function of the diquark in
both cases with a constant bare diquark mass and twice of the running quark
self-energy. It is found that the diquark, especially the small diquark,
obtains a large effective mass by the gluonic dressing effect. The scalar
diquark mass seems to be dynamically generated by the non-perturbative effect,
although it does not have the chiral symmetry.
|
[
{
"created": "Tue, 14 Jan 2014 08:27:22 GMT",
"version": "v1"
},
{
"created": "Thu, 6 Feb 2014 01:16:34 GMT",
"version": "v2"
}
] |
2014-02-07
|
[
[
"Imai",
"Shotaro",
""
],
[
"Suganuma",
"Hideo",
""
]
] |
The diquark has been considered to be important effective degrees of freedom in hadron physics, especially for multi-quark physics and the structure of heavy hadronic states. Using the Schwinger-Dyson formalism, we investigate the non-perturbative effect of gluons for scalar diquarks with renormalization-group improved coupling in the Landau gauge. Here, we treat the scalar diquark as an effective degree of freedom with a peculiar size, while the diquark is originally a bound-state-like object of two quarks. Since the diquark has a non-zero color charge, it strongly interacts with gluons. We evaluate the gluonic non-perturbative effect to the diquark, considering the size effect of the diquark. We investigate the mass function of the diquark in both cases with a constant bare diquark mass and twice of the running quark self-energy. It is found that the diquark, especially the small diquark, obtains a large effective mass by the gluonic dressing effect. The scalar diquark mass seems to be dynamically generated by the non-perturbative effect, although it does not have the chiral symmetry.
|
1910.12691
|
Alejandro Segarra
|
Jose Bernabeu, Alejandro Segarra
|
Genuine and Matter-induced Components of the CPV Asymmetry for Neutrino
Oscillations
|
7 pages, 5 figures, 1 table. Proceedings of EPS-HEP 2019
| null | null | null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
These results represent the solution for the historical problem of the
contamination by matter effects on the CPV Asymmetry for neutrino oscillations.
Vacuum is CPT-symmetric and matter is T-symmetric, the goal is accomplished by
using this guiding principle. Independent of the theoretical framework for the
dynamics of the active neutrino flavors, we prove the Disentanglement Theorem
A(CP)=A(CP, T)+A(CP, CPT) for the experimental CPV Asymmetry, with A(CP, T)
genuine T-odd and A(CP, CPT) fake CPT-odd. For the effective Hamiltonian
written as the sum of free mass propagation plus the matter potential for
electron-neutrinos, the two components have definite parities under the
baseline L, the matter potential "a", the imaginary part $\sin\delta$ of the
PMNS mixing matrix and the hierarchy "h"=$\pm 1$ in the neutrino mass ordering:
A(CP, T) is odd in L and $\sin\delta$ plus even in a and h; A(CP, CPT) is even
in L and $\sin\delta$ plus odd in a and almost odd in h. For present
terrestrial accelerator sources of muon-neutrinos and antineutrinos, the two
components of the appearance CPV asymmetry A(CP) can be disentangled by either
baseline dependence (HKK) or energy dependence (DUNE). At the DUNE baseline,
the higher energy region above the first oscillation node provides a dominant
matter-induced A(CP, CPT) component and the sign of the experimental asymmetry
A(CP) gives the hierarchy in the neutrino mass ordering. On the contrary, there
is a "magic energy" E around the second oscillation maximum in which the fake
A(CP, CPT) component has a first-rank zero whereas the genuine A(CP, T)
component has a maximum proportional to sin{\delta}. With a modest energy
resolution $\Delta E \sim 200$ MeV an effective zero remains in the
matter-induced A(CP, CPT).
|
[
{
"created": "Mon, 28 Oct 2019 14:07:05 GMT",
"version": "v1"
}
] |
2019-10-29
|
[
[
"Bernabeu",
"Jose",
""
],
[
"Segarra",
"Alejandro",
""
]
] |
These results represent the solution for the historical problem of the contamination by matter effects on the CPV Asymmetry for neutrino oscillations. Vacuum is CPT-symmetric and matter is T-symmetric, the goal is accomplished by using this guiding principle. Independent of the theoretical framework for the dynamics of the active neutrino flavors, we prove the Disentanglement Theorem A(CP)=A(CP, T)+A(CP, CPT) for the experimental CPV Asymmetry, with A(CP, T) genuine T-odd and A(CP, CPT) fake CPT-odd. For the effective Hamiltonian written as the sum of free mass propagation plus the matter potential for electron-neutrinos, the two components have definite parities under the baseline L, the matter potential "a", the imaginary part $\sin\delta$ of the PMNS mixing matrix and the hierarchy "h"=$\pm 1$ in the neutrino mass ordering: A(CP, T) is odd in L and $\sin\delta$ plus even in a and h; A(CP, CPT) is even in L and $\sin\delta$ plus odd in a and almost odd in h. For present terrestrial accelerator sources of muon-neutrinos and antineutrinos, the two components of the appearance CPV asymmetry A(CP) can be disentangled by either baseline dependence (HKK) or energy dependence (DUNE). At the DUNE baseline, the higher energy region above the first oscillation node provides a dominant matter-induced A(CP, CPT) component and the sign of the experimental asymmetry A(CP) gives the hierarchy in the neutrino mass ordering. On the contrary, there is a "magic energy" E around the second oscillation maximum in which the fake A(CP, CPT) component has a first-rank zero whereas the genuine A(CP, T) component has a maximum proportional to sin{\delta}. With a modest energy resolution $\Delta E \sim 200$ MeV an effective zero remains in the matter-induced A(CP, CPT).
|
hep-ph/0504027
|
Simonetta Liuti
|
S. Liuti and S.K. Taneja
|
Nuclear Medium Modifications of Hadrons from Generalized Parton
Distributions
|
29 pages, 10 figures
|
Phys.Rev. C72 (2005) 034902
|
10.1103/PhysRevC.72.034902
| null |
hep-ph
| null |
We study the structure of generalized parton distributions in spin 0 nuclei
within a microscopic approach for nuclear dynamics. GPDs can be used on one
side as tools to unravel the deep inelastic transverse structure of nuclei in
terms of both transverse spatial and transverse momentum degrees of freedom. On
the other, one can obtain information on GPDs themselves by observing how they
become modified in the nuclear environment. We derive the structure of the
nuclear deeply virtual Compton scattering tensor and generalized parton
distributions at leading order in $Q$ in a field-theoretical framework. The
nuclear generalized parton distributions are calculated using a two step
process -- the convolution approach -- where the scattering process happens
from a quark inside a nucleon, itself inside a nucleus, disregarding final
state interactions with both the nuclear and nucleon debris. We point out that
details of the nuclear long range interactions such as two-body currents, can
be disregarded compared to the deep inelastic induced modifications of the
bound GPDs. We show how the pattern of nuclear modifications predicted, and in
particular the deviations of off-shell effects from the longitudinal
convolution provide clear signals to be sought in experimental measurements.
Finally, we find interesting relationships by studying Mellin moments in
nuclei: in particular we predict the $A$-dependence for the $D$-term of GPDs
within a microscopic approach, and the behavior with $t$ of the total momentum
carried by quarks in a nucleus. The latter provides an important element for
the evaluation of nuclear hadronization phenomena which are vital for
interpreting current and future data at RHIC, HERMES and Jefferson Lab.
|
[
{
"created": "Mon, 4 Apr 2005 22:32:54 GMT",
"version": "v1"
},
{
"created": "Fri, 6 May 2005 21:51:03 GMT",
"version": "v2"
}
] |
2009-11-11
|
[
[
"Liuti",
"S.",
""
],
[
"Taneja",
"S. K.",
""
]
] |
We study the structure of generalized parton distributions in spin 0 nuclei within a microscopic approach for nuclear dynamics. GPDs can be used on one side as tools to unravel the deep inelastic transverse structure of nuclei in terms of both transverse spatial and transverse momentum degrees of freedom. On the other, one can obtain information on GPDs themselves by observing how they become modified in the nuclear environment. We derive the structure of the nuclear deeply virtual Compton scattering tensor and generalized parton distributions at leading order in $Q$ in a field-theoretical framework. The nuclear generalized parton distributions are calculated using a two step process -- the convolution approach -- where the scattering process happens from a quark inside a nucleon, itself inside a nucleus, disregarding final state interactions with both the nuclear and nucleon debris. We point out that details of the nuclear long range interactions such as two-body currents, can be disregarded compared to the deep inelastic induced modifications of the bound GPDs. We show how the pattern of nuclear modifications predicted, and in particular the deviations of off-shell effects from the longitudinal convolution provide clear signals to be sought in experimental measurements. Finally, we find interesting relationships by studying Mellin moments in nuclei: in particular we predict the $A$-dependence for the $D$-term of GPDs within a microscopic approach, and the behavior with $t$ of the total momentum carried by quarks in a nucleus. The latter provides an important element for the evaluation of nuclear hadronization phenomena which are vital for interpreting current and future data at RHIC, HERMES and Jefferson Lab.
|
1706.01190
|
Nakul Soni Mr.
|
N. R. Soni and J. N. Pandya
|
Decay ${\mathit{D} \to} {{\mathit K}^{(*)}}{{\mathit \ell}^{+}}{{\mathit
\nu}_{{{{\mathit \ell}}}}}$ in covariant quark model
|
20 pages, 6 tables, 7 figures
|
Phys. Rev. D 96, 016017 (2017)
|
10.1103/PhysRevD.96.016017
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We study the leptonic and semileptonic $D$-meson decays (${{\mathit D} \to}
{{\mathit \ell}^{+}}{{\mathit \nu}_{{{{\mathit \ell}}}}}$ and ${\mathit{D} \to}
{{\mathit K}^{(*)}}{{\mathit \ell}^{+}}{{\mathit \nu}_{{{{\mathit \ell}}}}}$)
in the framework of covariant quark model with built-in infrared confinement.
We compute the required form factors in the entire kinematical momentum
transfer region. The calculated form factors are used to evaluate the branching
fractions of these transitions. We determine the following ratios of the
partial widths: $\Gamma ({{\mathit D}^{0}} \rightarrow {{\mathit
K}^{-}}{{\mathit e}^{+}}{{\mathit \nu}_{{e}}})/\Gamma({{\mathit D}^{+}}
\rightarrow {{\overline{\mathit K}}^{0}}{{\mathit e}^{+}}{{\mathit \nu}_{{e}}})
= 1.02$, $\Gamma({{\mathit D}^{0}} \rightarrow {{\mathit K}^{-}}{{\mathit
\mu}^{+}}{{\mathit \nu}_{{\mu}}})/\Gamma({{\mathit D}^{+}} \rightarrow
{{\overline{\mathit K}}^{0}}{{\mathit \mu}^{+}}{{\mathit \nu}_{{\mu}}}) = 0.99$
and $\Gamma({{\mathit D}^{+}} \rightarrow {{\overline{\mathit K}}^{0}}{{\mathit
\mu}^{+}}{{\mathit \nu}_{{\mu}}}) / \Gamma({{\mathit D}^{+}} \rightarrow
{{\overline{\mathit K}}^{0}}{{\mathit e}^{+}}{{\mathit \nu}_{{e}}}) = 0.97$
which are in close resemblance with the iso-spin invariance and experimental
results.
|
[
{
"created": "Mon, 5 Jun 2017 04:51:40 GMT",
"version": "v1"
},
{
"created": "Sat, 8 Jul 2017 11:40:45 GMT",
"version": "v2"
}
] |
2017-08-02
|
[
[
"Soni",
"N. R.",
""
],
[
"Pandya",
"J. N.",
""
]
] |
We study the leptonic and semileptonic $D$-meson decays (${{\mathit D} \to} {{\mathit \ell}^{+}}{{\mathit \nu}_{{{{\mathit \ell}}}}}$ and ${\mathit{D} \to} {{\mathit K}^{(*)}}{{\mathit \ell}^{+}}{{\mathit \nu}_{{{{\mathit \ell}}}}}$) in the framework of covariant quark model with built-in infrared confinement. We compute the required form factors in the entire kinematical momentum transfer region. The calculated form factors are used to evaluate the branching fractions of these transitions. We determine the following ratios of the partial widths: $\Gamma ({{\mathit D}^{0}} \rightarrow {{\mathit K}^{-}}{{\mathit e}^{+}}{{\mathit \nu}_{{e}}})/\Gamma({{\mathit D}^{+}} \rightarrow {{\overline{\mathit K}}^{0}}{{\mathit e}^{+}}{{\mathit \nu}_{{e}}}) = 1.02$, $\Gamma({{\mathit D}^{0}} \rightarrow {{\mathit K}^{-}}{{\mathit \mu}^{+}}{{\mathit \nu}_{{\mu}}})/\Gamma({{\mathit D}^{+}} \rightarrow {{\overline{\mathit K}}^{0}}{{\mathit \mu}^{+}}{{\mathit \nu}_{{\mu}}}) = 0.99$ and $\Gamma({{\mathit D}^{+}} \rightarrow {{\overline{\mathit K}}^{0}}{{\mathit \mu}^{+}}{{\mathit \nu}_{{\mu}}}) / \Gamma({{\mathit D}^{+}} \rightarrow {{\overline{\mathit K}}^{0}}{{\mathit e}^{+}}{{\mathit \nu}_{{e}}}) = 0.97$ which are in close resemblance with the iso-spin invariance and experimental results.
|
hep-ph/0701001
|
Shouhua Zhu
|
Shou-hua Zhu (Peking University)
|
U-boson at BESIII
|
3 refs added, minor text modification, PRD version
|
Phys.Rev.D75:115004,2007
|
10.1103/PhysRevD.75.115004
| null |
hep-ph hep-ex
| null |
The $O$(MeV) spin-1 U-boson has been proposed to mediate the interaction
among electron-positron and $O$(MeV) dark matter, in order to account for the
511 keV $\gamma$-ray observation by SPI/INTEGRAL. In this paper the
observability of such kind of U-boson at BESIII is investigated through the
processes $e^+e^- \to U \gamma$ and $e^+e^- \to J/\Psi \to e^+e^- U$. We find
that BESIII and high luminosity B-factories have the comparable capacity to
detect such U-boson. If U-boson decays mainly into dark matter, i.e. invisibly,
BESIII can measure the coupling among U-boson and electron-positron $g_{eR}$
(see text) down to $O(10^{-5})$, and cover large parameter space which can
account for 511 keV $\gamma$-ray observation. On the other hand, provided that
U decays mainly into electron-positron, BESIII can detect $g_{eR}$ down to
$O(10^{-3})$, and it is hard to explore 511 keV
$\gamma$-ray measurement allowed parameter space due to the irreducible QED
backgrounds.
|
[
{
"created": "Fri, 29 Dec 2006 21:11:01 GMT",
"version": "v1"
},
{
"created": "Fri, 11 May 2007 01:39:05 GMT",
"version": "v2"
}
] |
2008-11-26
|
[
[
"Zhu",
"Shou-hua",
"",
"Peking University"
]
] |
The $O$(MeV) spin-1 U-boson has been proposed to mediate the interaction among electron-positron and $O$(MeV) dark matter, in order to account for the 511 keV $\gamma$-ray observation by SPI/INTEGRAL. In this paper the observability of such kind of U-boson at BESIII is investigated through the processes $e^+e^- \to U \gamma$ and $e^+e^- \to J/\Psi \to e^+e^- U$. We find that BESIII and high luminosity B-factories have the comparable capacity to detect such U-boson. If U-boson decays mainly into dark matter, i.e. invisibly, BESIII can measure the coupling among U-boson and electron-positron $g_{eR}$ (see text) down to $O(10^{-5})$, and cover large parameter space which can account for 511 keV $\gamma$-ray observation. On the other hand, provided that U decays mainly into electron-positron, BESIII can detect $g_{eR}$ down to $O(10^{-3})$, and it is hard to explore 511 keV $\gamma$-ray measurement allowed parameter space due to the irreducible QED backgrounds.
|
2103.11412
|
Xing-Hua Yang
|
Xing-Hua Yang and Zhong-Juan Yang
|
Doubly Charged Higgs Production at Future $ep$ Colliders
|
21 pages, 9 figures
| null |
10.1088/1674-1137/ac581b
| null |
hep-ph
|
http://creativecommons.org/licenses/by/4.0/
|
The Higgs sector of the standard model can be extended by introducing an
$SU(2)_L$ Higgs triplet $\Delta$ to generate the tiny neutrino masses in the
framework of type-II seesaw mechanism. In this paper, we study the pair
production of the introduced Higgs triplet at future $e^{-}p$ colliders. The
corresponding production cross sections via vector boson fusion process at
FCC-ep and ILC$\otimes$FCC are predicted, where the production of a pair of
doubly charged Higgs is found to be dominant and then used to investigate the
collider phenomenology of the Higgs triplet. Depending on the size of the Higgs
triplet vacuum expectation value, the doubly charged Higgs may decay into a
pair of same-sign charged leptons or a pair of same-sign $W$ bosons. In order
to explore the discovery potential of the doubly charged Higgs at future
$e^{-}p$ colliders, we discuss these two decay scenarios in detail and show
respectively the detection sensitivity on the mass of the doubly charged Higgs.
|
[
{
"created": "Sun, 21 Mar 2021 14:39:25 GMT",
"version": "v1"
}
] |
2022-06-08
|
[
[
"Yang",
"Xing-Hua",
""
],
[
"Yang",
"Zhong-Juan",
""
]
] |
The Higgs sector of the standard model can be extended by introducing an $SU(2)_L$ Higgs triplet $\Delta$ to generate the tiny neutrino masses in the framework of type-II seesaw mechanism. In this paper, we study the pair production of the introduced Higgs triplet at future $e^{-}p$ colliders. The corresponding production cross sections via vector boson fusion process at FCC-ep and ILC$\otimes$FCC are predicted, where the production of a pair of doubly charged Higgs is found to be dominant and then used to investigate the collider phenomenology of the Higgs triplet. Depending on the size of the Higgs triplet vacuum expectation value, the doubly charged Higgs may decay into a pair of same-sign charged leptons or a pair of same-sign $W$ bosons. In order to explore the discovery potential of the doubly charged Higgs at future $e^{-}p$ colliders, we discuss these two decay scenarios in detail and show respectively the detection sensitivity on the mass of the doubly charged Higgs.
|
1807.11300
|
Mikhail Ivanov
|
Thomas Gutsche, Mikhail A. Ivanov, J\"urgen G. K\"orner, Valery E.
Lyubovitskij, Pietro Santorelli, Chien-Thang Tran
|
Analyzing lepton flavor universality in the decays
$\Lambda_b\to\Lambda_c^{(\ast)}(\frac12^\pm,\frac32^-) + \ell\,\bar\nu_\ell$
|
some references added
|
Phys. Rev. D 98, 053003 (2018)
|
10.1103/PhysRevD.98.053003
| null |
hep-ph hep-ex
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Lepton flavor universality can be tested in the semileptonic decays
$\Lambda_b\to \Lambda_c^{(\ast)}$ where $\Lambda_c^{(\ast)}$ denotes either the
ground state $\Lambda_c(2286)$ (with $J^P=1/2^+$) or its orbital excitations
$\Lambda_c(2595)$ (with $J^P=1/2^-$) and $\Lambda_c(2625)$ (with $J^P=3/2^-$).
We calculate the differential decay rates as well as the branching fractions of
these decays for both tauonic and muonic modes with form factors obtained from
a covariant confined quark model previously developed by us. We present results
for the rate ratios of the tauonic and muonic modes which provide important
tests of lepton flavor universality in forthcoming experiments.
|
[
{
"created": "Mon, 30 Jul 2018 11:53:35 GMT",
"version": "v1"
},
{
"created": "Wed, 12 Sep 2018 14:07:16 GMT",
"version": "v2"
}
] |
2018-09-19
|
[
[
"Gutsche",
"Thomas",
""
],
[
"Ivanov",
"Mikhail A.",
""
],
[
"Körner",
"Jürgen G.",
""
],
[
"Lyubovitskij",
"Valery E.",
""
],
[
"Santorelli",
"Pietro",
""
],
[
"Tran",
"Chien-Thang",
""
]
] |
Lepton flavor universality can be tested in the semileptonic decays $\Lambda_b\to \Lambda_c^{(\ast)}$ where $\Lambda_c^{(\ast)}$ denotes either the ground state $\Lambda_c(2286)$ (with $J^P=1/2^+$) or its orbital excitations $\Lambda_c(2595)$ (with $J^P=1/2^-$) and $\Lambda_c(2625)$ (with $J^P=3/2^-$). We calculate the differential decay rates as well as the branching fractions of these decays for both tauonic and muonic modes with form factors obtained from a covariant confined quark model previously developed by us. We present results for the rate ratios of the tauonic and muonic modes which provide important tests of lepton flavor universality in forthcoming experiments.
|
hep-ph/0005066
|
Dolors Eiras
|
Dolors Eiras and Joan Soto
|
Light Fermion Finite Mass Effects in Non-relativistic Bound States
|
12 pages, 3 figures
|
Phys.Lett. B491 (2000) 101-110
|
10.1016/S0370-2693(00)01004-2
| null |
hep-ph nucl-th physics.atom-ph
| null |
We present analytic expressions for the vacuum polarization effects due to a
light fermion with finite mass in the binding energy and in the wave function
at the origin of QED and (weak coupling) QCD non-relativistic bound states.
Applications to exotic atoms, \Upsilon (1s) and t\bar{t} production near
threshold are briefly discussed.
|
[
{
"created": "Mon, 8 May 2000 09:53:08 GMT",
"version": "v1"
},
{
"created": "Thu, 7 Sep 2000 10:40:18 GMT",
"version": "v2"
}
] |
2009-10-31
|
[
[
"Eiras",
"Dolors",
""
],
[
"Soto",
"Joan",
""
]
] |
We present analytic expressions for the vacuum polarization effects due to a light fermion with finite mass in the binding energy and in the wave function at the origin of QED and (weak coupling) QCD non-relativistic bound states. Applications to exotic atoms, \Upsilon (1s) and t\bar{t} production near threshold are briefly discussed.
|
2010.02943
|
Pierluca Carenza
|
Pierluca Carenza, Bryce Fore, Maurizio Giannotti, Alessandro Mirizzi,
Sanjay Reddy
|
Enhanced Supernova Axion Emission and its Implications
|
6 pages, 1 figure. v2: minor corrections to match the published
version. Added a discussion on the trapping regime
|
Phys. Rev. Lett. 126, 071102 (2021)
|
10.1103/PhysRevLett.126.071102
| null |
hep-ph astro-ph.HE astro-ph.SR
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We calculate the axion emission rate from reactions involving thermal pions
in matter encountered in supernovae and neutron star mergers, identify unique
spectral features, and explore their implications for astrophysics and particle
physics. We find that it is about 2-5 times larger than nucleon-nucleon
bremsstrahlung, which in past studies was considered to be the dominant
process. The axion spectrum is also found be much harder. Together, the larger
rates and higher axion energies imply a stronger bound on the mass of the QCD
axion, and better prospects for direct detection in a large underground
neutrino detector from a nearby galactic supernova.
|
[
{
"created": "Tue, 6 Oct 2020 18:00:13 GMT",
"version": "v1"
},
{
"created": "Sat, 20 Feb 2021 06:56:51 GMT",
"version": "v2"
}
] |
2021-02-23
|
[
[
"Carenza",
"Pierluca",
""
],
[
"Fore",
"Bryce",
""
],
[
"Giannotti",
"Maurizio",
""
],
[
"Mirizzi",
"Alessandro",
""
],
[
"Reddy",
"Sanjay",
""
]
] |
We calculate the axion emission rate from reactions involving thermal pions in matter encountered in supernovae and neutron star mergers, identify unique spectral features, and explore their implications for astrophysics and particle physics. We find that it is about 2-5 times larger than nucleon-nucleon bremsstrahlung, which in past studies was considered to be the dominant process. The axion spectrum is also found be much harder. Together, the larger rates and higher axion energies imply a stronger bound on the mass of the QCD axion, and better prospects for direct detection in a large underground neutrino detector from a nearby galactic supernova.
|
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