id stringlengths 9 14 | submitter stringlengths 1 56 ⌀ | authors stringlengths 5 7.68k | title stringlengths 3 299 | comments stringlengths 1 1.15k ⌀ | journal-ref stringlengths 9 298 ⌀ | doi stringlengths 12 97 ⌀ | report-no stringlengths 3 341 ⌀ | categories stringclasses 869 values | license stringclasses 9 values | orig_abstract stringlengths 16 2.44k | versions listlengths 1 39 | update_date stringlengths 10 10 | authors_parsed listlengths 1 565 | abstract stringlengths 13 2.44k |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
0903.2701 | Benjamin Galow | H.J. Pirner and B. Galow | Equivalence of the AdS-Metric and the QCD Running Coupling | 6 pages, 5 figures | Phys.Lett.B679:51-55,2009 | 10.1016/j.physletb.2009.07.009 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We use the functional form of the QCD running coupling to modify the
conformal metric in AdS/CFT mapping the fifth-dimensional z-coordinate to the
energy scale in the four-dimensional QCD. The resulting type-0 string theory in
five dimensions is solved with the Nambu-Goto action giving good agreement with
the Coulombic and confinement $Q \bar Q$ potential.
| [
{
"created": "Mon, 16 Mar 2009 08:26:52 GMT",
"version": "v1"
},
{
"created": "Tue, 9 Jun 2009 11:26:53 GMT",
"version": "v2"
},
{
"created": "Fri, 3 Jul 2009 14:12:10 GMT",
"version": "v3"
}
] | 2010-01-08 | [
[
"Pirner",
"H. J.",
""
],
[
"Galow",
"B.",
""
]
] | We use the functional form of the QCD running coupling to modify the conformal metric in AdS/CFT mapping the fifth-dimensional z-coordinate to the energy scale in the four-dimensional QCD. The resulting type-0 string theory in five dimensions is solved with the Nambu-Goto action giving good agreement with the Coulombic and confinement $Q \bar Q$ potential. |
1902.09056 | Wen-long Sang | Hong-Fei Zhang (College of Big Data Statistics, Guizhou University of
Finance and Economics, Guiyang, China), Yu Feng (Department of Physics,
College of Basic Medical Sciences, Army Medical University, Chongqing,
China), Wen-Long Sang (School of Physical Science and Technology, Southwest
University, Chongqing, China), Yu-Peng Yan (School of Physics and Center of
Excellence in High Energy Physics and Astrophysics, Suranaree University of
Technology, Nakhon Ratchasima, Thailand) | Kinematic distributions of the $\eta_c$ photoproduction in $ep$
collisions within the nonrelativistic QCD framework | 6pages, 2 figures | Phys. Rev. D 99, 114018 (2019) | 10.1103/PhysRevD.99.114018 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the $\eta_c$ photoproduction in $ep$ collisions in this paper. The
short-distance coefficients for $c\bar{c}(^1S_0^{[1]})$,
$c\bar{c}(^1S_0^{[8]})$, $c\bar{c}(^3S_1^{[8]})$, and $c\bar{c}(^1P_1^{[8]})$
photoproductions are evaluated at leading order in $\alpha_s$ expansion, where
the color-singlet contribution is achieved for the first time. We have
carefully analyzed different kinematic distributions of the cross sections and
found that the color-singlet contribution is considerably suppressed comparing
with the color-octet parts. This feature renders the $\eta_c$ photoproduction
process an ideal laboratory to test the color-octet mechanism in
nonrelativistic QCD. By taking different sets of long-distance matrix elements,
we have observed some apparently distinguishable predictions, which can be
utilized to scrutinize the validity of these matrix elements.
| [
{
"created": "Mon, 25 Feb 2019 01:59:53 GMT",
"version": "v1"
}
] | 2019-06-26 | [
[
"Zhang",
"Hong-Fei",
"",
"College of Big Data Statistics, Guizhou University of\n Finance and Economics, Guiyang, China"
],
[
"Feng",
"Yu",
"",
"Department of Physics,\n College of Basic Medical Sciences, Army Medical University, Chongqing,\n China"
],
[
"Sang",
... | We study the $\eta_c$ photoproduction in $ep$ collisions in this paper. The short-distance coefficients for $c\bar{c}(^1S_0^{[1]})$, $c\bar{c}(^1S_0^{[8]})$, $c\bar{c}(^3S_1^{[8]})$, and $c\bar{c}(^1P_1^{[8]})$ photoproductions are evaluated at leading order in $\alpha_s$ expansion, where the color-singlet contribution is achieved for the first time. We have carefully analyzed different kinematic distributions of the cross sections and found that the color-singlet contribution is considerably suppressed comparing with the color-octet parts. This feature renders the $\eta_c$ photoproduction process an ideal laboratory to test the color-octet mechanism in nonrelativistic QCD. By taking different sets of long-distance matrix elements, we have observed some apparently distinguishable predictions, which can be utilized to scrutinize the validity of these matrix elements. |
hep-ph/9506432 | null | V.S. Fadin, R. Fiore, A. Quartarolo | Reggeization of quark-quark scattering amplitude in QCD | 31 pages+2figures(appended as a postscript file), Latex | Phys.Rev. D53 (1996) 2729-2741 | 10.1103/PhysRevD.53.2729 | CS-TH 12/95 | hep-ph | null | $s$-channel discontinuity of quark-quark scattering amplitude with gluon
quantum numbers in the $t$ channel and negative signature is calculated in the
Regge kinematical region in the two-loop approximation. Using this
discontinuity and assuming that the Regge asymptotic behaviour is given by the
Reggeized gluon contribution, we calculate the gluon trajectory in the two-loop
approximation. Remarkable cancellations lead to the independence of the
trajectory on properties of the scattered quarks, confirming the gluon
Reggeization.
| [
{
"created": "Tue, 27 Jun 1995 09:36:37 GMT",
"version": "v1"
}
] | 2009-10-28 | [
[
"Fadin",
"V. S.",
""
],
[
"Fiore",
"R.",
""
],
[
"Quartarolo",
"A.",
""
]
] | $s$-channel discontinuity of quark-quark scattering amplitude with gluon quantum numbers in the $t$ channel and negative signature is calculated in the Regge kinematical region in the two-loop approximation. Using this discontinuity and assuming that the Regge asymptotic behaviour is given by the Reggeized gluon contribution, we calculate the gluon trajectory in the two-loop approximation. Remarkable cancellations lead to the independence of the trajectory on properties of the scattered quarks, confirming the gluon Reggeization. |
1206.3019 | Carlos Quimbay | C. Quimbay, J. Morales | Particle mass generation from physical vacuum | 28 pages. arXiv admin note: substantial text overlap with
arXiv:hep-ph/0702145, arXiv:0805.2116, arXiv:hep-ph/0109209 | Apeiron 18 (2011) 161 | null | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present an approach for particle mass generation in which the physical
vacuum is assumed as a medium at zero temperature and where the dynamics of the
vacuum is described by the Standard Model without the Higgs sector. In this
approach fermions acquire masses from interactions with vacuum and gauge bosons
from charge fluctuations of vacuum. The obtained results are consistent with
the physical mass spectrum, in such a manner that left-handed neutrinos are
massive. Masses of electroweak gauge bosons are properly predicted in terms of
experimental fermion masses and running coupling constants of strong,
electromagnetic and weak interactions. An existing empirical relation between
the top quark mass and the electroweak gauge boson masses is explained by means
of this approach.
| [
{
"created": "Thu, 14 Jun 2012 07:00:30 GMT",
"version": "v1"
}
] | 2012-06-15 | [
[
"Quimbay",
"C.",
""
],
[
"Morales",
"J.",
""
]
] | We present an approach for particle mass generation in which the physical vacuum is assumed as a medium at zero temperature and where the dynamics of the vacuum is described by the Standard Model without the Higgs sector. In this approach fermions acquire masses from interactions with vacuum and gauge bosons from charge fluctuations of vacuum. The obtained results are consistent with the physical mass spectrum, in such a manner that left-handed neutrinos are massive. Masses of electroweak gauge bosons are properly predicted in terms of experimental fermion masses and running coupling constants of strong, electromagnetic and weak interactions. An existing empirical relation between the top quark mass and the electroweak gauge boson masses is explained by means of this approach. |
hep-ph/0101106 | Tilman Plehn | V.Barger, T.Falk, T.Han, J.Jiang, T.Li, and T.Plehn | CP-Violating Phases in SUSY, Electric Dipole Moments, and Linear
Colliders | 29 pages, version accepted by PRD, Figure 8 changed, minor changes in
wording | Phys.Rev.D64:056007,2001 | 10.1103/PhysRevD.64.056007 | MADPH-00-1207, TPI-00164, UPR-916-T | hep-ph | null | We reexamine large CP-violating phases in the general Minimal Supersymmetric
Standard Model, as well as more restricted models. We perform a detailed scan
over parameter space to find solutions which satisfy the current experimental
limits on the electric dipole moments of the electron, neutron and $^{199}$Hg
atom, exploring the allowed configurations of phases and masses, and we attempt
to quantify the level of tuning of the parameters necessary to populate the
regions of cancellations. We then consider the measurement of CP-violating
phases at a future linear collider. We find that measurements of chargino and
neutralino masses and production cross-sections allow for a determination of
$\phi_1$(the phase of $M_1$) to a precision of $\pi/30$, while the EDM
constraints require that $\theta_\mu$ be too small to be measured. Using the
EDM constraints we find that the CP-even model parameters and the phase
$\phi_1$ can be determined at a Linear Collider with $400 \gev$ c.m. energy. As
long as some information on the size of $|\mu|$ is included in the observables,
a measurement of $\phi_1$ is guaranteed for $\phi_1 > \pi/10$. To unambiguously
identify CP violation, we construct CP-odd kinematical variables at a linear
collider. However, the CP asymmetries are rather small, typically about
$0.1-1.5%$, and it will be challenging to experimentally observe the predicted
asymmetries.
| [
{
"created": "Wed, 10 Jan 2001 22:48:48 GMT",
"version": "v1"
},
{
"created": "Tue, 20 Mar 2001 00:22:08 GMT",
"version": "v2"
}
] | 2009-09-15 | [
[
"Barger",
"V.",
""
],
[
"Falk",
"T.",
""
],
[
"Han",
"T.",
""
],
[
"Jiang",
"J.",
""
],
[
"Li",
"T.",
""
],
[
"Plehn",
"T.",
""
]
] | We reexamine large CP-violating phases in the general Minimal Supersymmetric Standard Model, as well as more restricted models. We perform a detailed scan over parameter space to find solutions which satisfy the current experimental limits on the electric dipole moments of the electron, neutron and $^{199}$Hg atom, exploring the allowed configurations of phases and masses, and we attempt to quantify the level of tuning of the parameters necessary to populate the regions of cancellations. We then consider the measurement of CP-violating phases at a future linear collider. We find that measurements of chargino and neutralino masses and production cross-sections allow for a determination of $\phi_1$(the phase of $M_1$) to a precision of $\pi/30$, while the EDM constraints require that $\theta_\mu$ be too small to be measured. Using the EDM constraints we find that the CP-even model parameters and the phase $\phi_1$ can be determined at a Linear Collider with $400 \gev$ c.m. energy. As long as some information on the size of $|\mu|$ is included in the observables, a measurement of $\phi_1$ is guaranteed for $\phi_1 > \pi/10$. To unambiguously identify CP violation, we construct CP-odd kinematical variables at a linear collider. However, the CP asymmetries are rather small, typically about $0.1-1.5%$, and it will be challenging to experimentally observe the predicted asymmetries. |
hep-ph/9505431 | null | D. B. Lichtenberg and R. Roncaglia | NEW FORMULAS RELATING THE MASSES OF SOME BARYONS AND MESONS | 3 pages, Plain TeX, no figures | Phys.Lett. B358 (1995) 106-108 | 10.1016/0370-2693(95)00990-3 | IUHET 302, IU/NTC 95-06 | hep-ph | null | Sum rules relating the masses of ground-state baryons and mesons are obtained
in a constituent quark model. The interaction is assumed to be independent of
quark spins except for a spin-dependent part that can be treated as a
perturbation. Where data are available, the sum rules agree with experiment to
better than 1\%.
| [
{
"created": "Wed, 31 May 1995 10:17:41 GMT",
"version": "v1"
}
] | 2009-10-28 | [
[
"Lichtenberg",
"D. B.",
""
],
[
"Roncaglia",
"R.",
""
]
] | Sum rules relating the masses of ground-state baryons and mesons are obtained in a constituent quark model. The interaction is assumed to be independent of quark spins except for a spin-dependent part that can be treated as a perturbation. Where data are available, the sum rules agree with experiment to better than 1\%. |
hep-ph/9612386 | Frans Klinkhamer | F. R. Klinkhamer | Electroweak defects | Expanded version of published paper, 12 pages LaTeX, includes
Postscript figures and style file | null | null | KA-TP-26-1996 | hep-ph astro-ph | null | A brief, non-technical review is given of certain defect-like configurations
in the electroweak standard model, which may have played an important role in
the physics of the early universe.
| [
{
"created": "Tue, 17 Dec 1996 14:22:52 GMT",
"version": "v1"
},
{
"created": "Wed, 18 Dec 1996 14:04:08 GMT",
"version": "v2"
},
{
"created": "Wed, 21 Jan 1998 12:44:02 GMT",
"version": "v3"
}
] | 2008-02-03 | [
[
"Klinkhamer",
"F. R.",
""
]
] | A brief, non-technical review is given of certain defect-like configurations in the electroweak standard model, which may have played an important role in the physics of the early universe. |
hep-ph/0703265 | Marco Radici | Federico A. Ceccopieri, Marco Radici, Alessandro Bacchetta | Evolution equations for extended dihadron fragmentation functions | 9 pages, 1 figure in eps format; RevTeX4 style | Phys.Lett.B650:81-89,2007 | 10.1016/j.physletb.2007.04.065 | null | hep-ph | null | We consider dihadron fragmentation functions, describing the fragmentation of
a parton in two unpolarized hadrons, and in particular extended dihadron
fragmentation functions, explicitly dependent on the invariant mass, $M_h$, of
the hadron pair. We first rederive the known results on $M_h$-integrated
functions using Jet Calculus techniques, and then we present the evolution
equations for extended dihadron fragmentation functions. Our results are
relevant for the analysis of experimental measurements of
two-particle-inclusive processes at different energies.
| [
{
"created": "Sat, 24 Mar 2007 13:32:32 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Ceccopieri",
"Federico A.",
""
],
[
"Radici",
"Marco",
""
],
[
"Bacchetta",
"Alessandro",
""
]
] | We consider dihadron fragmentation functions, describing the fragmentation of a parton in two unpolarized hadrons, and in particular extended dihadron fragmentation functions, explicitly dependent on the invariant mass, $M_h$, of the hadron pair. We first rederive the known results on $M_h$-integrated functions using Jet Calculus techniques, and then we present the evolution equations for extended dihadron fragmentation functions. Our results are relevant for the analysis of experimental measurements of two-particle-inclusive processes at different energies. |
hep-ph/0307150 | Sergio Scopetta | Sergio Scopetta (Perugia) and Vicente Vento (Valencia) | Generalized parton distributions and composite constituent quarks | 38 pages, 8 figures; final, extended version accepted by Phys. Rev. D | Phys.Rev.D69:094004,2004 | 10.1103/PhysRevD.69.094004 | FTUV-03-0708; IFIC-03-35 | hep-ph nucl-th | null | An approach is proposed to calculate Generalized Parton Distributions (GPDs)
in a Constituent Quark Model (CQM) scenario, considering the constituent quarks
as complex systems. The GPDs are obtained from the wave functions of the non
relativistic CQM of Isgur and Karl, convoluted with the GPDs of the constituent
quarks themselves. The latter are modelled by using the structure functions of
the constituent quark, the double distribution representation of GPDs, and a
recently proposed phenomenological constituent quark form factor. The present
approach permits to access a kinematical range corresponding to both the DGLAP
and the ERBL regions, for small values of the momentum transfer and of the
skewedness parameter. In this kinematical region, the cross sections relevant
to deeply virtual Compton scattering could be estimated by using the obtained
GPDs. As an example, the leading twist, unpolarized GPD $H$ has been
calculated. Its general relations with the non relativistic definition of the
electric form factor and with the leading twist unpolarized quark density are
consistently recovered from our expressions.Further natural applications of the
proposed approach are addressed.
| [
{
"created": "Thu, 10 Jul 2003 17:52:46 GMT",
"version": "v1"
},
{
"created": "Wed, 25 Feb 2004 10:03:01 GMT",
"version": "v2"
}
] | 2011-02-01 | [
[
"Scopetta",
"Sergio",
"",
"Perugia"
],
[
"Vento",
"Vicente",
"",
"Valencia"
]
] | An approach is proposed to calculate Generalized Parton Distributions (GPDs) in a Constituent Quark Model (CQM) scenario, considering the constituent quarks as complex systems. The GPDs are obtained from the wave functions of the non relativistic CQM of Isgur and Karl, convoluted with the GPDs of the constituent quarks themselves. The latter are modelled by using the structure functions of the constituent quark, the double distribution representation of GPDs, and a recently proposed phenomenological constituent quark form factor. The present approach permits to access a kinematical range corresponding to both the DGLAP and the ERBL regions, for small values of the momentum transfer and of the skewedness parameter. In this kinematical region, the cross sections relevant to deeply virtual Compton scattering could be estimated by using the obtained GPDs. As an example, the leading twist, unpolarized GPD $H$ has been calculated. Its general relations with the non relativistic definition of the electric form factor and with the leading twist unpolarized quark density are consistently recovered from our expressions.Further natural applications of the proposed approach are addressed. |
2408.06759 | Azhothkaran Bhaghyesh Dr. | Chaitanya Anil Bokade and Bhaghyesh | Charmonium: Conventional and $XYZ$ States in a Relativistic Screened
Potential Model | 24 pages | null | null | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this work a comprehensive analysis of the mass spectrum and decay
properties of charmonium states within a relativistic framework is carried out.
The present experimental status of charmonium states is reviewed. Utilizing a
screened potential model, we compute the spectra and various decay widths for
$c\bar{c}$ bound system, comparing our results with experimental data and
existing theoretical models. We calculate the decay constants, $E1$ and $M1$
transitions, and annihilation decay widths, confirming the consistency of our
model with experimental observations for well-established charmonium states.
The interpretation of charmonium-like states, $X(4140)$, $X(4274)$, and
$X(4500)$ as $P$ wave charmonium states and $\psi(4040)$, $\psi(3770)$,
$\psi(4160)$, $\psi(4230)$, $\psi(4360)$, $\psi(4415)$, $Y(4500)$ and $Y(4360)$
as $S-D$ mixed charmonium states are carried out.
| [
{
"created": "Tue, 13 Aug 2024 09:34:29 GMT",
"version": "v1"
}
] | 2024-08-14 | [
[
"Bokade",
"Chaitanya Anil",
""
],
[
"Bhaghyesh",
"",
""
]
] | In this work a comprehensive analysis of the mass spectrum and decay properties of charmonium states within a relativistic framework is carried out. The present experimental status of charmonium states is reviewed. Utilizing a screened potential model, we compute the spectra and various decay widths for $c\bar{c}$ bound system, comparing our results with experimental data and existing theoretical models. We calculate the decay constants, $E1$ and $M1$ transitions, and annihilation decay widths, confirming the consistency of our model with experimental observations for well-established charmonium states. The interpretation of charmonium-like states, $X(4140)$, $X(4274)$, and $X(4500)$ as $P$ wave charmonium states and $\psi(4040)$, $\psi(3770)$, $\psi(4160)$, $\psi(4230)$, $\psi(4360)$, $\psi(4415)$, $Y(4500)$ and $Y(4360)$ as $S-D$ mixed charmonium states are carried out. |
hep-ph/9908367 | Leif Lonnblad | Nick Brook, Leif Lonnblad | Summary of activities in the Working Group on QCD Cascades of the HERA
Monte Carlo workshop | To be published in the proceedings of the HERA Monte Carlo workshop,
Hamburg, Germany, 1998-1999 | null | null | null | hep-ph | null | We summarize the activities in working group 10 concerned with QCD cascades,
and find that although much work still needs to be done, much progress was made
during this workshop in understanding the merits and deficiencies of different
programs.
| [
{
"created": "Mon, 16 Aug 1999 10:26:12 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Brook",
"Nick",
""
],
[
"Lonnblad",
"Leif",
""
]
] | We summarize the activities in working group 10 concerned with QCD cascades, and find that although much work still needs to be done, much progress was made during this workshop in understanding the merits and deficiencies of different programs. |
1011.5748 | Toshiaki Kaneko | Toshiaki Kaneko and Hirotaka Sugawara | Broken $S_3$ Symmetry in Flavor Physics | 10 pages with 1 Postscript figure | Phys.Lett.B697:329-332,2011 | 10.1016/j.physletb.2011.02.017 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The $S_3$ symmetry is shown to be a very good approximate symmetry when it is
broken in a specific way. This is true both in quark sector and in lepton
sector. The way to break it is implied by the K-M mechanism applied not to the
mixing matrix but to the mass matrices. In quark sector, we have an almost
perfect fitting to the experimental data, and in lepton sector, we have a
precision for the $\theta_{13}$.
| [
{
"created": "Fri, 26 Nov 2010 10:26:39 GMT",
"version": "v1"
},
{
"created": "Fri, 10 Dec 2010 04:18:36 GMT",
"version": "v2"
}
] | 2011-05-12 | [
[
"Kaneko",
"Toshiaki",
""
],
[
"Sugawara",
"Hirotaka",
""
]
] | The $S_3$ symmetry is shown to be a very good approximate symmetry when it is broken in a specific way. This is true both in quark sector and in lepton sector. The way to break it is implied by the K-M mechanism applied not to the mixing matrix but to the mass matrices. In quark sector, we have an almost perfect fitting to the experimental data, and in lepton sector, we have a precision for the $\theta_{13}$. |
hep-ph/0604056 | Jose Rodriguez-Quintero | Ph. Boucaud, Th. Br\"untjen, J.P. Leroy, A. Le Yaouanc, A.Y. Lokhov,
J. Micheli, O. P\`ene and J.Rodr\'iguez-Quintero | Is the QCD ghost dressing function finite at zero momentum ? | 8 pages, 2 figures | JHEP 0606:001,2006 | 10.1088/1126-6708/2006/06/001 | null | hep-ph hep-lat | null | We show that a finite non-vanishing ghost dressing function at zero momentum
satisfies the scaling properties of the ghost propagator Schwinger-Dyson
equation. This kind of Schwinger-Dyson solutions may well agree with lattice
data and provides an interesting alternative to the widely spread claim that
the gluon dressing function behaves like the inverse squared ghost dressing
function, a claim which is at odds with lattice data. We demonstrate that, if
the ghost dressing function is less singular than any power of $p$, it must be
finite non-vanishing at zero momentum: any logarithmic behaviour is for
instance excluded. We add some remarks about coupled Schwinger-Dyson analyses.
| [
{
"created": "Thu, 6 Apr 2006 15:52:06 GMT",
"version": "v1"
}
] | 2010-03-19 | [
[
"Boucaud",
"Ph.",
""
],
[
"Brüntjen",
"Th.",
""
],
[
"Leroy",
"J. P.",
""
],
[
"Yaouanc",
"A. Le",
""
],
[
"Lokhov",
"A. Y.",
""
],
[
"Micheli",
"J.",
""
],
[
"Pène",
"O.",
""
],
[
"Rodríguez-Quinte... | We show that a finite non-vanishing ghost dressing function at zero momentum satisfies the scaling properties of the ghost propagator Schwinger-Dyson equation. This kind of Schwinger-Dyson solutions may well agree with lattice data and provides an interesting alternative to the widely spread claim that the gluon dressing function behaves like the inverse squared ghost dressing function, a claim which is at odds with lattice data. We demonstrate that, if the ghost dressing function is less singular than any power of $p$, it must be finite non-vanishing at zero momentum: any logarithmic behaviour is for instance excluded. We add some remarks about coupled Schwinger-Dyson analyses. |
1411.7382 | Jeremy Mardon | Saptarshi Chaudhuri, Peter W. Graham, Kent Irwin, Jeremy Mardon,
Surjeet Rajendran, Yue Zhao | A Radio for Hidden-Photon Dark Matter Detection | 16 pages + appendices, 7 figures. v2 contains a rewritten "Note
Added", other minor text tweaks, typos corrected in Eqs. (B12) and (C28), and
2 figures added in the appendices. Matches version published in PRD | Phys. Rev. D 92, 075012 (2015) | 10.1103/PhysRevD.92.075012 | null | hep-ph astro-ph.CO hep-ex physics.ins-det | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We propose a resonant electromagnetic detector to search for hidden-photon
dark matter over an extensive range of masses. Hidden-photon dark matter can be
described as a weakly coupled "hidden electric field," oscillating at a
frequency fixed by the mass, and able to penetrate any shielding. At low
frequencies (compared to the inverse size of the shielding), we find that
observable effect of the hidden photon inside any shielding is a real,
oscillating magnetic field. We outline experimental setups designed to search
for hidden-photon dark matter, using a tunable, resonant LC circuit designed to
couple to this magnetic field. Our "straw man" setups take into consideration
resonator design, readout architecture and noise estimates. At high
frequencies,there is an upper limit to the useful size of a single resonator
set by $1/\nu$. However, many resonators may be multiplexed within a
hidden-photon coherence length to increase the sensitivity in this regime.
Hidden-photon dark matter has an enormous range of possible frequencies, but
current experiments search only over a few narrow pieces of that range. We find
the potential sensitivity of our proposal is many orders of magnitude beyond
current limits over an extensive range of frequencies, from 100 Hz up to 700
GHz and potentially higher.
| [
{
"created": "Wed, 26 Nov 2014 21:00:06 GMT",
"version": "v1"
},
{
"created": "Tue, 13 Oct 2015 00:06:00 GMT",
"version": "v2"
}
] | 2015-10-14 | [
[
"Chaudhuri",
"Saptarshi",
""
],
[
"Graham",
"Peter W.",
""
],
[
"Irwin",
"Kent",
""
],
[
"Mardon",
"Jeremy",
""
],
[
"Rajendran",
"Surjeet",
""
],
[
"Zhao",
"Yue",
""
]
] | We propose a resonant electromagnetic detector to search for hidden-photon dark matter over an extensive range of masses. Hidden-photon dark matter can be described as a weakly coupled "hidden electric field," oscillating at a frequency fixed by the mass, and able to penetrate any shielding. At low frequencies (compared to the inverse size of the shielding), we find that observable effect of the hidden photon inside any shielding is a real, oscillating magnetic field. We outline experimental setups designed to search for hidden-photon dark matter, using a tunable, resonant LC circuit designed to couple to this magnetic field. Our "straw man" setups take into consideration resonator design, readout architecture and noise estimates. At high frequencies,there is an upper limit to the useful size of a single resonator set by $1/\nu$. However, many resonators may be multiplexed within a hidden-photon coherence length to increase the sensitivity in this regime. Hidden-photon dark matter has an enormous range of possible frequencies, but current experiments search only over a few narrow pieces of that range. We find the potential sensitivity of our proposal is many orders of magnitude beyond current limits over an extensive range of frequencies, from 100 Hz up to 700 GHz and potentially higher. |
hep-ph/9510369 | Dr S. Sarkar | Subir Sarkar (Oxford) | Successful Supersymmetric Inflation | 4 pages, uuencoded PostScript (3 figures incl.), to appear in Proc.
International EPS Conf. on High Energy Physics, Brussels, 1995 | null | null | OUTP-95-39P | hep-ph astro-ph | null | The temperature fluctuations in the cosmic microwave background observed by
COBE provide strong support for an inflationary phase in the early universe,
below the GUT scale. We argue that a singlet field in a hidden sector of an
effective supergravity theory yields the required inflationary potential
without fine tuning. Reheating occurs to a temperature low enough to avoid the
gravitino problem, but high enough to allow subsequent baryogenesis. Two
observational consequences are that gravitational waves contribute negligibly
to the microwave background anisotropy, and the spectrum of scalar density
perturbations is `tilted', improving the fit to large-scale structure in an
universe dominated by cold dark matter.
| [
{
"created": "Mon, 23 Oct 1995 10:23:36 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Sarkar",
"Subir",
"",
"Oxford"
]
] | The temperature fluctuations in the cosmic microwave background observed by COBE provide strong support for an inflationary phase in the early universe, below the GUT scale. We argue that a singlet field in a hidden sector of an effective supergravity theory yields the required inflationary potential without fine tuning. Reheating occurs to a temperature low enough to avoid the gravitino problem, but high enough to allow subsequent baryogenesis. Two observational consequences are that gravitational waves contribute negligibly to the microwave background anisotropy, and the spectrum of scalar density perturbations is `tilted', improving the fit to large-scale structure in an universe dominated by cold dark matter. |
hep-ph/0410254 | Takeyasu Ito | Takeyasu M. Ito and Gary Prezeau | Neutrino mass constraints on beta decay | 4 pages, 3 figures; revised to reflect referee comments; accepted for
publication in Physical Review Letters | Phys.Rev.Lett. 94 (2005) 161802 | 10.1103/PhysRevLett.94.161802 | null | hep-ph hep-ex nucl-ex | null | Using the general connection between the upper limit on the neutrino mass and
the upper limits on certain types of non-Standard Model interaction that can
generate loop corrections to the neutrino mass, we derive constraints on some
non-Standard Model $d\to ue^-\bar{\nu}$ interactions. When cast into limits on
$n\to pe^-\bar{\nu}$ coupling constants, our results yield constraints on
scalar and tensor weak interactions improved by more than an order of magnitude
over the current experimental limits. When combined with the existing limits,
our results yield $|C_S/C_V|\alt 5\times 10^{-3}$, $|C'_S/C_V|\alt 5\times
10^{-3}$, $|C_T/C_A| \alt 1.2\times 10^{-2}$ and $|C'_T/C_A| \alt 1.2\times
10^{-2}$.
| [
{
"created": "Mon, 18 Oct 2004 21:08:00 GMT",
"version": "v1"
},
{
"created": "Mon, 4 Apr 2005 20:01:54 GMT",
"version": "v2"
}
] | 2007-05-23 | [
[
"Ito",
"Takeyasu M.",
""
],
[
"Prezeau",
"Gary",
""
]
] | Using the general connection between the upper limit on the neutrino mass and the upper limits on certain types of non-Standard Model interaction that can generate loop corrections to the neutrino mass, we derive constraints on some non-Standard Model $d\to ue^-\bar{\nu}$ interactions. When cast into limits on $n\to pe^-\bar{\nu}$ coupling constants, our results yield constraints on scalar and tensor weak interactions improved by more than an order of magnitude over the current experimental limits. When combined with the existing limits, our results yield $|C_S/C_V|\alt 5\times 10^{-3}$, $|C'_S/C_V|\alt 5\times 10^{-3}$, $|C_T/C_A| \alt 1.2\times 10^{-2}$ and $|C'_T/C_A| \alt 1.2\times 10^{-2}$. |
0906.2670 | Bernd Kniehl | B.A. Kniehl, A. Sirlin | Novel formulations of CKM matrix renormalization | 4 pages, 1 figure, talk presented by A. Sirlin at CIPANP 2009: Tenth
Conference on the Intersections of Particle and Nuclear Physics, San Diego,
26-31 May 2009, to appear in the proceedings | AIP Conf.Proc.1182:327-330,2009 | 10.1063/1.3293809 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We review two recently proposed on-shell schemes for the renormalization of
the Cabibbo-Kobayashi-Maskawa (CKM) quark mixing matrix in the Standard Model.
One first constructs gauge-independent mass counterterm matrices for the up-
and down-type quarks complying with the hermiticity of the complete mass
matrices. Diagonalization of the latter then leads to explicit expressions for
the CKM counterterm matrix, which are gauge independent, preserve unitarity,
and lead to renormalized amplitudes that are non-singular in the limit in which
any two quarks become mass degenerate. One of the schemes also automatically
satisfies flavor democracy.
| [
{
"created": "Mon, 15 Jun 2009 12:18:28 GMT",
"version": "v1"
}
] | 2010-01-15 | [
[
"Kniehl",
"B. A.",
""
],
[
"Sirlin",
"A.",
""
]
] | We review two recently proposed on-shell schemes for the renormalization of the Cabibbo-Kobayashi-Maskawa (CKM) quark mixing matrix in the Standard Model. One first constructs gauge-independent mass counterterm matrices for the up- and down-type quarks complying with the hermiticity of the complete mass matrices. Diagonalization of the latter then leads to explicit expressions for the CKM counterterm matrix, which are gauge independent, preserve unitarity, and lead to renormalized amplitudes that are non-singular in the limit in which any two quarks become mass degenerate. One of the schemes also automatically satisfies flavor democracy. |
hep-ph/0408224 | Andreas Gerhold | A. Gerhold | Two aspects of color superconductivity: gauge independence and
neutrality | 5 pages, to appear in the proceedings of SEWM 2004, Helsinki, 16-19
June 2004 | null | 10.1142/9789812702159_0053 | TUW-04-18 | hep-ph | null | A formal proof is given that the fermionic quasiparticle dispersion laws in a
color superconductor are gauge independent. It is shown that the gluon (photon)
field acquires a non-vanishing expectation value in a color superconductor,
which is related to color (electric) neutrality.
| [
{
"created": "Fri, 20 Aug 2004 18:56:31 GMT",
"version": "v1"
}
] | 2017-08-23 | [
[
"Gerhold",
"A.",
""
]
] | A formal proof is given that the fermionic quasiparticle dispersion laws in a color superconductor are gauge independent. It is shown that the gluon (photon) field acquires a non-vanishing expectation value in a color superconductor, which is related to color (electric) neutrality. |
hep-ph/0311051 | Damjan Janc | M. Rosina, D. Janc | Double heavy baryons and dimesons | Talk presented at the Fourth Int. Conf. on Perspectives in Hadronic
Physics, ICTP - Trieste; May 12-16, 2003; to be published in European Journal
of Physics A; 6 pages LaTeX | Eur.Phys.J. A19 (2004) 43-45 | 10.1140/epjad/s2004-03-007-y | null | hep-ph | null | We critically examine the question whether the cc\bar{q}\bar{q} dimeson is
bound or not.
| [
{
"created": "Tue, 4 Nov 2003 15:34:07 GMT",
"version": "v1"
}
] | 2015-06-25 | [
[
"Rosina",
"M.",
""
],
[
"Janc",
"D.",
""
]
] | We critically examine the question whether the cc\bar{q}\bar{q} dimeson is bound or not. |
hep-ph/0505104 | Jari Laamanen | Jari Laamanen | Invisible Higgs in large extra dimensions | Four pages, four figures, axodraw, pdproc. Talk presented at the 12th
International Conference on Supersymmetry and Unification of Fundamental
Interactions, June 17-23, 2004, Epochal Tsukuba, Tsukuba, Japan. Published in
KEK Proceedings 2004-12 | null | null | null | hep-ph | null | We discuss the possibility of detecting a Higgs boson in electron-positron
collider experiments if large extra dimensions are realized in nature. In such
a case, the Higgs boson can decay invisibly by oscillating into a graviscalar
Kaluza-Klein (KK) tower. We show that the search for such a Higgs at an $e^+
e^-$ linear collider entails more complications than are usually thought of in
relation to an invisibly decaying Higgs.
| [
{
"created": "Thu, 12 May 2005 16:34:06 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Laamanen",
"Jari",
""
]
] | We discuss the possibility of detecting a Higgs boson in electron-positron collider experiments if large extra dimensions are realized in nature. In such a case, the Higgs boson can decay invisibly by oscillating into a graviscalar Kaluza-Klein (KK) tower. We show that the search for such a Higgs at an $e^+ e^-$ linear collider entails more complications than are usually thought of in relation to an invisibly decaying Higgs. |
hep-ph/9311244 | Poul Damgaard | P.H. Damgaard and R. Sollacher | Qualitons from QCD | LaTeX, 12 pages, CERN--TH-7073/93 | Phys.Lett. B322 (1994) 131-140 | 10.1016/0370-2693(94)90501-0 | null | hep-ph | null | Qualitons, topological excitations with the quantum numbers of quarks, may
provide an accurate description of what is meant by constituent quarks in QCD.
Their existence hinges crucially on an effective Lagrangian description of QCD
in which a pseudoscalar colour-octet of fields enters as a new variable. We
show here how such new fields may be extracted from the fundamental QCD
Lagrangian using the gauge-symmetric collective field technique.
| [
{
"created": "Tue, 9 Nov 1993 11:58:48 GMT",
"version": "v1"
}
] | 2009-10-22 | [
[
"Damgaard",
"P. H.",
""
],
[
"Sollacher",
"R.",
""
]
] | Qualitons, topological excitations with the quantum numbers of quarks, may provide an accurate description of what is meant by constituent quarks in QCD. Their existence hinges crucially on an effective Lagrangian description of QCD in which a pseudoscalar colour-octet of fields enters as a new variable. We show here how such new fields may be extracted from the fundamental QCD Lagrangian using the gauge-symmetric collective field technique. |
hep-ph/9703362 | null | Mou Roy and Jose Wudka | Majorana Neutrinos and Gravitational Oscillation | 11 pages, 8 figures, Latex; requires revtex and epsf.tex submitted to
Physical Review D | Phys.Rev.D56:2403-2407,1997 | 10.1103/PhysRevD.56.2403 | UCRHEP-T174 | hep-ph | null | We analyze the possibility of encountering resonant transitions of high
energy Majorana neutrinos produced in Active Galactic Nuclei (AGN). We consider
gravitational, electromagnetic and matter effects and show that the latter are
ignorable. Resonant oscillations due to the gravitational interactions are
shown to occur at energies in the PeV range for magnetic moments in the
$10^{-17} \mu_B$ range. Coherent precession will dominate for larger magnetic
moments. The alllowed regions for gravitational resonant transitions are
obtained.
| [
{
"created": "Tue, 18 Mar 1997 22:49:40 GMT",
"version": "v1"
}
] | 2014-11-17 | [
[
"Roy",
"Mou",
""
],
[
"Wudka",
"Jose",
""
]
] | We analyze the possibility of encountering resonant transitions of high energy Majorana neutrinos produced in Active Galactic Nuclei (AGN). We consider gravitational, electromagnetic and matter effects and show that the latter are ignorable. Resonant oscillations due to the gravitational interactions are shown to occur at energies in the PeV range for magnetic moments in the $10^{-17} \mu_B$ range. Coherent precession will dominate for larger magnetic moments. The alllowed regions for gravitational resonant transitions are obtained. |
2206.06852 | Kensuke Akita | Kensuke Akita, Sang Hui Im, Mehedi Masud | Probing non-standard neutrino interactions with a light boson from next
galactic and diffuse supernova neutrinos | 36 pages, 11 figures, 1 Table. v2: Results for vector bosons added in
appendices. References and minor clarifications added. Matches the published
version in JHEP | null | 10.1007/JHEP12(2022)050 | CTPU-PTC-22-13 | hep-ph astro-ph.CO astro-ph.HE hep-ex | http://creativecommons.org/licenses/by/4.0/ | Non-standard neutrino interactions with a massive boson can produce the
bosons in the core of core-collapse supernovae (SNe). After the emission of the
bosons from the SN core, their subsequent decays into neutrinos can modify the
SN neutrino flux. We show future observations of neutrinos from a next galactic
SN in Super-Kamiokande (SK) and Hyper-Kamiokande (HK) can probe
flavor-universal non-standard neutrino couplings to a light boson, improving
the previous limit from the SN 1987A neutrino burst by several orders of
magnitude. We also discuss sensitivity of the flavor-universal non-standard
neutrino interactions in future observations of diffuse neutrinos from all the
past SNe, known as the diffuse supernova neutrino background (DSNB). According
to our analysis, observations of the DSNB in HK, JUNO and DUNE experiments can
probe such couplings by a factor of $\sim 2$ beyond the SN 1987A constraint.
However, our result is also subject to a large uncertainty concerning the
precise estimation of the DSNB.
| [
{
"created": "Tue, 14 Jun 2022 13:45:27 GMT",
"version": "v1"
},
{
"created": "Mon, 12 Dec 2022 09:06:52 GMT",
"version": "v2"
}
] | 2022-12-28 | [
[
"Akita",
"Kensuke",
""
],
[
"Im",
"Sang Hui",
""
],
[
"Masud",
"Mehedi",
""
]
] | Non-standard neutrino interactions with a massive boson can produce the bosons in the core of core-collapse supernovae (SNe). After the emission of the bosons from the SN core, their subsequent decays into neutrinos can modify the SN neutrino flux. We show future observations of neutrinos from a next galactic SN in Super-Kamiokande (SK) and Hyper-Kamiokande (HK) can probe flavor-universal non-standard neutrino couplings to a light boson, improving the previous limit from the SN 1987A neutrino burst by several orders of magnitude. We also discuss sensitivity of the flavor-universal non-standard neutrino interactions in future observations of diffuse neutrinos from all the past SNe, known as the diffuse supernova neutrino background (DSNB). According to our analysis, observations of the DSNB in HK, JUNO and DUNE experiments can probe such couplings by a factor of $\sim 2$ beyond the SN 1987A constraint. However, our result is also subject to a large uncertainty concerning the precise estimation of the DSNB. |
hep-ph/9305309 | John Collins | John C. Collins, Steve F. Heppelmann, Glenn A. Ladinsky | Measuring transversity densities in singly polarized hadron-hadron and
lepton-hadron collisions | 16 pages, LaTeX + EPSF, 2 postscript figures. PSU/TH/101 | Nucl.Phys.B420:565-582,1994 | 10.1016/0550-3213(94)90078-7 | null | hep-ph | null | We show how the transverse polarization of a quark initiating a jet can be
probed by the azimuthal distribution of two hadrons (of large $z$) in the jet.
This permits a twist 2 asymmetry in hard processes when only one of the initial
particles is polarized transversely. Applications to hadron-hadron and
lepton-hadron scattering are discussed.
| [
{
"created": "Mon, 24 May 1993 22:39:29 GMT",
"version": "v1"
}
] | 2011-07-19 | [
[
"Collins",
"John C.",
""
],
[
"Heppelmann",
"Steve F.",
""
],
[
"Ladinsky",
"Glenn A.",
""
]
] | We show how the transverse polarization of a quark initiating a jet can be probed by the azimuthal distribution of two hadrons (of large $z$) in the jet. This permits a twist 2 asymmetry in hard processes when only one of the initial particles is polarized transversely. Applications to hadron-hadron and lepton-hadron scattering are discussed. |
hep-ph/0610252 | Bernd Kniehl | B. A. Kniehl | Soft-gluon and hadron-mass effects on fragmentation functions | 6 pages, 4 figures, to appear in the proceedings of the IPM School
and Conference on Lepton and Hadron Physics, Teheran, IRAN, May 15--20, 2006 | ECONFC0605151:0013,2006; Nucl.Phys.A783:23-30,2007 | 10.1016/j.nuclphysa.2006.11.002 | null | hep-ph | null | We review recent progress in the development of an approach valid to any
order which unifies the fixed-order DGLAP evolution of fragmentation functions
at large x with soft-gluon logarithmic resummation at small x. At leading
order, this approach, implemented with the Double Logarithmic Approximation,
reproduces exactly the Modified Leading Logarithm Approximation, but it is more
complete due to the degrees of freedom given to the quark sector and the
inclusion of the fixed-order terms. We find that data from the largest x values
to the peak region can be better fitted than with other approaches. In
addition, we develop a treatment of hadron mass effects that leads to
additional improvements at small x.
| [
{
"created": "Thu, 19 Oct 2006 16:09:00 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Kniehl",
"B. A.",
""
]
] | We review recent progress in the development of an approach valid to any order which unifies the fixed-order DGLAP evolution of fragmentation functions at large x with soft-gluon logarithmic resummation at small x. At leading order, this approach, implemented with the Double Logarithmic Approximation, reproduces exactly the Modified Leading Logarithm Approximation, but it is more complete due to the degrees of freedom given to the quark sector and the inclusion of the fixed-order terms. We find that data from the largest x values to the peak region can be better fitted than with other approaches. In addition, we develop a treatment of hadron mass effects that leads to additional improvements at small x. |
2208.07609 | Lei Ming | Marco Drewes and Lei Ming | Connecting Cosmic Inflation to Particle Physics with LiteBIRD, CMB-S4,
EUCLID and SKA | 7 pages, 2 figures; matches version published in PRL | Phys.Rev.Lett. 133 (2024) 3, 031001 | 10.1103/PhysRevLett.133.031001 | null | hep-ph astro-ph.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We show that next generation Cosmic Microwave Background experiments will be
capable of the first ever measurement of the inflaton coupling to other
particles, opening a new window to probe the connection between cosmic
inflation and particle physics.This sensitivity is based on the impact that the
reheating phase after cosmic inflation has on the redshifting of cosmic
perturbations. For our analysis we introduce a simple analytic method to
estimate the sensitivity of future CMB observations to the reheating
temperature and the inflaton coupling. Applying our method to LiteBIRD and
CMB-S4 we find that, within a given model of inflation, these missions have the
potential to impose both an upper and a lower bound on the inflaton coupling.
Further improvement can be achieved if CMB data is combined with optical and
21cm surveys. Our results demonstrate the potential of future observations to
constrain microphysical parameters that can provide an important clue to
understand how a given model of inflation may be embedded in a more fundamental
theory of nature.
| [
{
"created": "Tue, 16 Aug 2022 08:50:36 GMT",
"version": "v1"
},
{
"created": "Wed, 8 May 2024 03:01:05 GMT",
"version": "v2"
},
{
"created": "Sat, 20 Jul 2024 05:38:35 GMT",
"version": "v3"
}
] | 2024-07-23 | [
[
"Drewes",
"Marco",
""
],
[
"Ming",
"Lei",
""
]
] | We show that next generation Cosmic Microwave Background experiments will be capable of the first ever measurement of the inflaton coupling to other particles, opening a new window to probe the connection between cosmic inflation and particle physics.This sensitivity is based on the impact that the reheating phase after cosmic inflation has on the redshifting of cosmic perturbations. For our analysis we introduce a simple analytic method to estimate the sensitivity of future CMB observations to the reheating temperature and the inflaton coupling. Applying our method to LiteBIRD and CMB-S4 we find that, within a given model of inflation, these missions have the potential to impose both an upper and a lower bound on the inflaton coupling. Further improvement can be achieved if CMB data is combined with optical and 21cm surveys. Our results demonstrate the potential of future observations to constrain microphysical parameters that can provide an important clue to understand how a given model of inflation may be embedded in a more fundamental theory of nature. |
1610.09953 | Boris Ermolaev | B.I. Ermolaev, S.I. Troyan | Non-perturbative gluon-hadron inputs for all available forms of QCD
factorization | Transition from KT factorization to Collinear Factorization and
structure of non-perturbative inputs for Collinear Factroization are
considered in a much more detailed way. Several Refs are added | null | null | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Description of hadronic reactions at high energies is conventionally done on
basis of QCD factoriza- tion so that factorization convolutions involve
non-perturbative inputs mimicking non-perturbative contributions and
perturbative evolution of those inputs. We construct the inputs for the gluon-
hadron scattering amplitudes in the forward kinematics and, using the Optical
theorem, convert them into inputs for gluon distributions in the both polarized
and unpolarized hadrons. Firstly, we derive general mathematical criteria which
any model for the inputs should obey and then suggest a Resonance Model
satisfying those criteria. This model is inspired by a simple observation:
after emitting an active parton off the hadron, the remaining ensemble of
spectators becomes unstable and therefore it can be described through factors
of the resonance type. Exploiting Resonance Model, we obtain non-perturbative
inputs for gluon distributions in unpolarized and polarized hadrons for all
available forms of QCD factorization: Basic, KT - and Collinear Factorizations.
We compare the obtained inputs to the inputs available in the literature.
| [
{
"created": "Mon, 31 Oct 2016 14:53:04 GMT",
"version": "v1"
},
{
"created": "Wed, 22 Feb 2017 10:54:11 GMT",
"version": "v2"
}
] | 2017-02-23 | [
[
"Ermolaev",
"B. I.",
""
],
[
"Troyan",
"S. I.",
""
]
] | Description of hadronic reactions at high energies is conventionally done on basis of QCD factoriza- tion so that factorization convolutions involve non-perturbative inputs mimicking non-perturbative contributions and perturbative evolution of those inputs. We construct the inputs for the gluon- hadron scattering amplitudes in the forward kinematics and, using the Optical theorem, convert them into inputs for gluon distributions in the both polarized and unpolarized hadrons. Firstly, we derive general mathematical criteria which any model for the inputs should obey and then suggest a Resonance Model satisfying those criteria. This model is inspired by a simple observation: after emitting an active parton off the hadron, the remaining ensemble of spectators becomes unstable and therefore it can be described through factors of the resonance type. Exploiting Resonance Model, we obtain non-perturbative inputs for gluon distributions in unpolarized and polarized hadrons for all available forms of QCD factorization: Basic, KT - and Collinear Factorizations. We compare the obtained inputs to the inputs available in the literature. |
hep-ph/0006206 | Alexander Bakulev | A. P. Bakulev (BLTPh, JINR, Dubna) and S. V. Mikhailov (BLTPh, JINR,
Dubna) | New shapes of light-cone distributions of the transversely polarized
\rho-mesons | 18 pages, 7 figures use psbox-macro, 1 table, introduction is
improved, new (7) section with applications to semileptonic B->rho-decay is
added. to appear in Eur. Phys. J. C | Eur.Phys.J.C19:361-372,2001 | 10.1007/s100520100603 | RUB-TPII-10/00, JINR-E2-2000-176 | hep-ph | null | We re-analyze the leading twist light-cone distributions for transversely
polarized \rho-, \rho'- and b_1-mesons in the framework of QCD sum rules with
nonlocal condensates. Using different kinds of sum rules to obtain reliable
predictions, we estimate the 2-, 4-, 6- and 8-th moments for transversely
polarized \rho- and \rho'-meson distributions and re-estimate tensor couplings
f^T_{\rho,\rho',b_1}. We stress that the results of standard sum rules also
support our estimation of the second moment of the transversely polarized
\rho-meson distribution. New models for light-cone distributions of these
mesons are constructed. Phenomenological consequences from these distributions
are briefly discussed. Our results are compared with those found by Ball and
Braun (1996), and the latter is shown to be incomplete.
| [
{
"created": "Sat, 17 Jun 2000 16:46:57 GMT",
"version": "v1"
},
{
"created": "Fri, 28 Jul 2000 10:20:27 GMT",
"version": "v2"
},
{
"created": "Wed, 31 Jan 2001 13:55:33 GMT",
"version": "v3"
}
] | 2009-09-25 | [
[
"Bakulev",
"A. P.",
"",
"BLTPh, JINR, Dubna"
],
[
"Mikhailov",
"S. V.",
"",
"BLTPh, JINR,\n Dubna"
]
] | We re-analyze the leading twist light-cone distributions for transversely polarized \rho-, \rho'- and b_1-mesons in the framework of QCD sum rules with nonlocal condensates. Using different kinds of sum rules to obtain reliable predictions, we estimate the 2-, 4-, 6- and 8-th moments for transversely polarized \rho- and \rho'-meson distributions and re-estimate tensor couplings f^T_{\rho,\rho',b_1}. We stress that the results of standard sum rules also support our estimation of the second moment of the transversely polarized \rho-meson distribution. New models for light-cone distributions of these mesons are constructed. Phenomenological consequences from these distributions are briefly discussed. Our results are compared with those found by Ball and Braun (1996), and the latter is shown to be incomplete. |
hep-ph/9904464 | Leszek Motyka | J. Kwiecinski and L. Motyka | The QCD pomeron in e+e- collisions | Contribution to the Cracow Epiphany Conference on Electron-Positron
Colliders, Cracow 5-10 Jan. 1999, 20 pages, Latex, 6 PS figures, to appear in
Acta Phys. Polon. B | Acta Phys.Polon. B30 (1999) 1817-1836 | null | TPJU-4/99 | hep-ph | null | The contribution of the QCD pomeron to the processes: e+e- to e+e- J/psi
J/psi and e+ e- to e+ e- hadrons (with tagged electrons) is discussed. We focus
on reactions which occur via photon-photon collisions, with virtual photons
coming from the Weizsaecker-Wiliams spectrum of the electrons. We stress the
importance of the non-leading corrections to the BFKL equation and take into
account dominant non-leading effects which come from the requirement that the
virtuality of the exchanged gluons along the gluon ladder is controlled by
their transverse momentum squared. The \gamma* \gamma* cross-sections are found
to increase with increasing \gamma* \gamma* CM energy W as (W^2)^{\lambda_P}
while the cross-section for \gamma\gamma to J/psi J/psi is found to increase as
(W^2)^{2\lambda_P}. The parameter \lambda_P is slowly varying with energy W and
takes the values lambda_P \sim 0.23 - 0.35 depending on the process. We also
analyze the contribution of the soft pomeron for the total \gamma* \gamma*
cross-section. We compare results of our calculations to the recent data from
LEP.
| [
{
"created": "Tue, 27 Apr 1999 14:00:10 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Kwiecinski",
"J.",
""
],
[
"Motyka",
"L.",
""
]
] | The contribution of the QCD pomeron to the processes: e+e- to e+e- J/psi J/psi and e+ e- to e+ e- hadrons (with tagged electrons) is discussed. We focus on reactions which occur via photon-photon collisions, with virtual photons coming from the Weizsaecker-Wiliams spectrum of the electrons. We stress the importance of the non-leading corrections to the BFKL equation and take into account dominant non-leading effects which come from the requirement that the virtuality of the exchanged gluons along the gluon ladder is controlled by their transverse momentum squared. The \gamma* \gamma* cross-sections are found to increase with increasing \gamma* \gamma* CM energy W as (W^2)^{\lambda_P} while the cross-section for \gamma\gamma to J/psi J/psi is found to increase as (W^2)^{2\lambda_P}. The parameter \lambda_P is slowly varying with energy W and takes the values lambda_P \sim 0.23 - 0.35 depending on the process. We also analyze the contribution of the soft pomeron for the total \gamma* \gamma* cross-section. We compare results of our calculations to the recent data from LEP. |
1402.2251 | He Zhang | Daniel Schmidt, Thomas Schwetz, He Zhang | Status of the Zee-Babu model for neutrino mass and possible tests at a
like-sign linear collider | 12 pages, 7 figures | null | 10.1016/j.nuclphysb.2014.05.024 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We provide an updated scan of the allowed parameter space of the two-loop
Zee-Babu model for neutrino mass. Taking into account most recent experimental
data on $\mu\to e\gamma$ as well as the mixing angle $\theta_{13}$ we obtain
lower bounds on the masses of the singly and doubly charged scalars of between
1 to 2 TeV, with some dependence on perturbativity and fine-tuning
requirements. This makes the scalars difficult to observe at LHC with 14 TeV
even with optimistic assumptions on the luminosity, and would require a
multi-TeV linear collider to see the scalar resonances. We point out, however,
that a sub-TeV linear collider in the like-sign mode may be able to observe
lepton flavour violating processes such as $e^- e^- \to \mu^- \mu^-$ due to
contact interactions induced by the doubly charged scalar with masses up to
around 10 TeV. We investigate the possibility to distinguish the Zee-Babu model
from the Higgs triplet model using such processes.
| [
{
"created": "Mon, 10 Feb 2014 19:52:57 GMT",
"version": "v1"
}
] | 2015-06-18 | [
[
"Schmidt",
"Daniel",
""
],
[
"Schwetz",
"Thomas",
""
],
[
"Zhang",
"He",
""
]
] | We provide an updated scan of the allowed parameter space of the two-loop Zee-Babu model for neutrino mass. Taking into account most recent experimental data on $\mu\to e\gamma$ as well as the mixing angle $\theta_{13}$ we obtain lower bounds on the masses of the singly and doubly charged scalars of between 1 to 2 TeV, with some dependence on perturbativity and fine-tuning requirements. This makes the scalars difficult to observe at LHC with 14 TeV even with optimistic assumptions on the luminosity, and would require a multi-TeV linear collider to see the scalar resonances. We point out, however, that a sub-TeV linear collider in the like-sign mode may be able to observe lepton flavour violating processes such as $e^- e^- \to \mu^- \mu^-$ due to contact interactions induced by the doubly charged scalar with masses up to around 10 TeV. We investigate the possibility to distinguish the Zee-Babu model from the Higgs triplet model using such processes. |
1405.7679 | Andrew Long | Andrew J. Long, Jeffrey M. Hyde, and Tanmay Vachaspati | Cosmic Strings in Hidden Sectors: 1. Radiation of Standard Model
Particles | 25 pages + 19 appendices / references ; 2 figures | null | 10.1088/1475-7516/2014/09/030 | null | hep-ph astro-ph.CO hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In hidden sector models with an extra U(1) gauge group, new fields can
interact with the Standard Model only through gauge kinetic mixing and the
Higgs portal. After the U(1) is spontaneously broken, these interactions couple
the resultant cosmic strings to Standard Model particles. We calculate the
spectrum of radiation emitted by these "dark strings" in the form of Higgs
bosons, Z bosons, and Standard Model fermions assuming that string tension is
above the TeV scale. We also calculate the scattering cross sections of
Standard Model fermions on dark strings due to the Aharonov-Bohm interaction.
These radiation and scattering calculations will be applied in a subsequent
paper to study the cosmological evolution and observational signatures of dark
strings.
| [
{
"created": "Thu, 29 May 2014 19:49:23 GMT",
"version": "v1"
}
] | 2015-06-19 | [
[
"Long",
"Andrew J.",
""
],
[
"Hyde",
"Jeffrey M.",
""
],
[
"Vachaspati",
"Tanmay",
""
]
] | In hidden sector models with an extra U(1) gauge group, new fields can interact with the Standard Model only through gauge kinetic mixing and the Higgs portal. After the U(1) is spontaneously broken, these interactions couple the resultant cosmic strings to Standard Model particles. We calculate the spectrum of radiation emitted by these "dark strings" in the form of Higgs bosons, Z bosons, and Standard Model fermions assuming that string tension is above the TeV scale. We also calculate the scattering cross sections of Standard Model fermions on dark strings due to the Aharonov-Bohm interaction. These radiation and scattering calculations will be applied in a subsequent paper to study the cosmological evolution and observational signatures of dark strings. |
hep-ph/9710461 | Thomas Gasenzer | D. Bruss (1), T. Gasenzer (2) and O. Nachtmann (2), ((1) ISI, Torino,
Italy; (2) Univ. Heidelberg, Germany) | New Observables for Parity Violation in Atoms: Energy Shifts in External
Electric Fields | 6 pages, 3 figures, LaTeX, submitted to Phys. Lett. A | Phys.Lett. A239 (1998) 81-86 | 10.1016/S0375-9601(97)00936-5 | HD-THEP-97-52 | hep-ph | null | We consider hydrogen-like atoms in unstable levels of principal quantum
number n=2, confined to a finite size region in a non-homogeneous electric
field carrying handedness. The interplay between the internal degrees of
freedom of the atoms and the external ones of their c.m. motion can produce
P-odd contributions to the eigenenergies. The nominal order of such shifts is
10^-8 Hz. Typically such energy shifts depend linearly on the small P-violation
parameters delta_i similarequal 10^-12 (i=1,2), essentially the ratios of the
P-violating mixing matrix elements of the 2S and 2P states over the Lamb shift,
with i=1 (i=2) corresponding to the nuclear spin independent (dependent) term.
We show how such energy shifts can be enhanced by a factor of similarequal 10^6
in a resonance like way for special field configurations where a crossing of
unstable levels occurs, leading to P-violating effects proportional to
squareroot{delta_i}. Measurements of such effects can give information
concerning the ``spin crisis'' of the nucleons.
| [
{
"created": "Fri, 24 Oct 1997 16:04:04 GMT",
"version": "v1"
}
] | 2009-10-30 | [
[
"Bruss",
"D.",
""
],
[
"Gasenzer",
"T.",
""
],
[
"Nachtmann",
"O.",
""
]
] | We consider hydrogen-like atoms in unstable levels of principal quantum number n=2, confined to a finite size region in a non-homogeneous electric field carrying handedness. The interplay between the internal degrees of freedom of the atoms and the external ones of their c.m. motion can produce P-odd contributions to the eigenenergies. The nominal order of such shifts is 10^-8 Hz. Typically such energy shifts depend linearly on the small P-violation parameters delta_i similarequal 10^-12 (i=1,2), essentially the ratios of the P-violating mixing matrix elements of the 2S and 2P states over the Lamb shift, with i=1 (i=2) corresponding to the nuclear spin independent (dependent) term. We show how such energy shifts can be enhanced by a factor of similarequal 10^6 in a resonance like way for special field configurations where a crossing of unstable levels occurs, leading to P-violating effects proportional to squareroot{delta_i}. Measurements of such effects can give information concerning the ``spin crisis'' of the nucleons. |
1603.00692 | Kwang-Chang Lai | Kwang-Chang Lai, Fei-Fan Lee, Feng-Shiuh Lee, Guey-Lin Lin, Tsung-Che
Liu, and Yi Yang | Probing Neutrino Mass Hierarchy by Comparing the Charged-Current and
Neutral-Current Interaction Rates of Supernova Neutrinos | 18 pages, 6 figures | null | 10.1088/1475-7516/2016/07/039 | null | hep-ph astro-ph.HE | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The neutrino mass hierarchy is one of the neutrino fundamental properties yet
to be determined. We introduce a method to determine neutrino mass hierarchy by
comparing the interaction rate of neutral current (NC) interactions,
$\nu(\hat{\nu}) + p\rightarrow\nu(\hat{\nu}) + p$, and inverse beta decays
(IBD), $\bar{\nu}_e + p\rightarrow n + e^+$, of supernova neutrinos in
scintillation detectors. Neutrino flavor conversions inside the supernova are
sensitive to neutrino mass hierarchy. Due to Mikheyev-Smirnov-Wolfenstein
effects, the full swapping of $\bar{\nu}_e$ flux with the $\bar{\nu}_x$
($x=\mu,~\tau$) one occurs in the inverted hierarchy, while such a swapping
does not occur in the normal hierarchy. As a result, more high energy IBD
events occur in the detector for the inverted hierarchy than the high energy
IBD events in the normal hierarchy. By comparing IBD interaction rate with the
mass hierarchy independent NC interaction rate, one can determine the neutrino
mass hierarchy.
| [
{
"created": "Wed, 2 Mar 2016 12:56:39 GMT",
"version": "v1"
},
{
"created": "Mon, 7 Mar 2016 04:04:21 GMT",
"version": "v2"
},
{
"created": "Mon, 13 Jun 2016 13:08:34 GMT",
"version": "v3"
}
] | 2016-07-27 | [
[
"Lai",
"Kwang-Chang",
""
],
[
"Lee",
"Fei-Fan",
""
],
[
"Lee",
"Feng-Shiuh",
""
],
[
"Lin",
"Guey-Lin",
""
],
[
"Liu",
"Tsung-Che",
""
],
[
"Yang",
"Yi",
""
]
] | The neutrino mass hierarchy is one of the neutrino fundamental properties yet to be determined. We introduce a method to determine neutrino mass hierarchy by comparing the interaction rate of neutral current (NC) interactions, $\nu(\hat{\nu}) + p\rightarrow\nu(\hat{\nu}) + p$, and inverse beta decays (IBD), $\bar{\nu}_e + p\rightarrow n + e^+$, of supernova neutrinos in scintillation detectors. Neutrino flavor conversions inside the supernova are sensitive to neutrino mass hierarchy. Due to Mikheyev-Smirnov-Wolfenstein effects, the full swapping of $\bar{\nu}_e$ flux with the $\bar{\nu}_x$ ($x=\mu,~\tau$) one occurs in the inverted hierarchy, while such a swapping does not occur in the normal hierarchy. As a result, more high energy IBD events occur in the detector for the inverted hierarchy than the high energy IBD events in the normal hierarchy. By comparing IBD interaction rate with the mass hierarchy independent NC interaction rate, one can determine the neutrino mass hierarchy. |
1702.04187 | Pouya Bakhti | Pouya Bakhti, Yasaman Farzan | Constraining secret gauge interactions of neutrinos by meson decays | 7 pages, 3 figures | Phys. Rev. D 95, 095008 (2017) | 10.1103/PhysRevD.95.095008 | null | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Secret coupling of neutrinos to a new light vector boson, $Z'$, with a mass
smaller than 100 MeV is motivated within a myriad of scenarios which are
designed to explain various anomalies in particle physics and cosmology. Due to
the longitudinal component of the massive vector boson, the rates of three-body
decay of charged mesons ($M$) such as the pion and the kaon to the light lepton
plus neutrino and $Z'$ ($M \to l \nu Z'$) are enhanced by a factor of
$(m_M/m_{Z'})^2$. On the other hand, the standard two body decay $M \to l \nu$
is suppressed by a factor of $(m_l/m_M)^2$ due to chirality. We show that in
the case of ($M \to e \nu Z^\prime$), the enhancement of $m_M^4/m_e^2
m_{Z^\prime}^2\sim 10^8-10^{10}$ relative to two-body decay ($M \to e \nu$)
enables us to probe very small values of gauge coupling for $\nu_e$. The
strongest bound comes from the $R_K\equiv Br(K \to e +\nu)/Br(K \to \mu +\nu)$
measurement in the NA62 experiment. The bound can be significantly improved by
customized searches for signals of three-body charged meson decay into the
positron plus missing energy in the NA62 and/or PIENU data.
| [
{
"created": "Tue, 14 Feb 2017 13:05:54 GMT",
"version": "v1"
},
{
"created": "Thu, 31 Aug 2017 16:54:58 GMT",
"version": "v2"
}
] | 2017-09-01 | [
[
"Bakhti",
"Pouya",
""
],
[
"Farzan",
"Yasaman",
""
]
] | Secret coupling of neutrinos to a new light vector boson, $Z'$, with a mass smaller than 100 MeV is motivated within a myriad of scenarios which are designed to explain various anomalies in particle physics and cosmology. Due to the longitudinal component of the massive vector boson, the rates of three-body decay of charged mesons ($M$) such as the pion and the kaon to the light lepton plus neutrino and $Z'$ ($M \to l \nu Z'$) are enhanced by a factor of $(m_M/m_{Z'})^2$. On the other hand, the standard two body decay $M \to l \nu$ is suppressed by a factor of $(m_l/m_M)^2$ due to chirality. We show that in the case of ($M \to e \nu Z^\prime$), the enhancement of $m_M^4/m_e^2 m_{Z^\prime}^2\sim 10^8-10^{10}$ relative to two-body decay ($M \to e \nu$) enables us to probe very small values of gauge coupling for $\nu_e$. The strongest bound comes from the $R_K\equiv Br(K \to e +\nu)/Br(K \to \mu +\nu)$ measurement in the NA62 experiment. The bound can be significantly improved by customized searches for signals of three-body charged meson decay into the positron plus missing energy in the NA62 and/or PIENU data. |
2405.08859 | Masaki Yamada | Yuichiro Tada and Masaki Yamada | Multifield Stochastic Dynamics in GUT Hybrid Inflation and Gravitational
Wave Signatures of GUT Higgs Representation | 8 pages, 1 figure | null | null | TU-1230 | hep-ph astro-ph.CO gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We revisit the hybrid inflation model within the framework of the Grand
Unified Theory (GUT), focusing on cases where the waterfall phase transition
extends over several e-foldings to dilute monopoles. Considering the stochastic
effects of quantum fluctuations, we demonstrate that the waterfall fields
(i.e., GUT Higgs) maintain a nonzero vacuum expectation value around the
waterfall phase transition. By accurately accounting for the number of degrees
of freedom of the GUT Higgs field, we establish that these fluctuations can
produce observable gravitational waves without leading to an overproduction of
primordial black holes. The amplitude of these gravitational waves is inversely
proportional to the degrees of freedom of the waterfall fields, thereby
providing a unique method to probe the representation of the GUT Higgs.
| [
{
"created": "Tue, 14 May 2024 18:00:00 GMT",
"version": "v1"
}
] | 2024-05-16 | [
[
"Tada",
"Yuichiro",
""
],
[
"Yamada",
"Masaki",
""
]
] | We revisit the hybrid inflation model within the framework of the Grand Unified Theory (GUT), focusing on cases where the waterfall phase transition extends over several e-foldings to dilute monopoles. Considering the stochastic effects of quantum fluctuations, we demonstrate that the waterfall fields (i.e., GUT Higgs) maintain a nonzero vacuum expectation value around the waterfall phase transition. By accurately accounting for the number of degrees of freedom of the GUT Higgs field, we establish that these fluctuations can produce observable gravitational waves without leading to an overproduction of primordial black holes. The amplitude of these gravitational waves is inversely proportional to the degrees of freedom of the waterfall fields, thereby providing a unique method to probe the representation of the GUT Higgs. |
hep-ph/0005030 | Namit Mahajan | Ashok Goyal, Abhinav Gupta and Namit Mahajan (Delhi University) | Neutrinos as Source of Ultra High Energy Cosmic Rays in Extra Dimensions | 16 pages Latex2e file including 4 postscript figures. Effect of brane
fluctuation taken into account | Phys.Rev. D63 (2001) 043003 | 10.1103/PhysRevD.63.043003 | null | hep-ph | null | If the neutrinos are to be identified with the primary source of ultra-high
energy cosmic rays(UHECR), their interaction on relic neutrinos is of great
importance in understanding their long intergalactic journey. In theories with
large compact dimensions, the exchange of a tower of massive spin-2 gravitons
(Kaluza-Klein excitations) gives extra contribution to $\nu\bar{\nu}
\longrightarrow f\bar{f}$ and $\gamma\gamma$ processes along with the opening
of a new channel for the neutrinos to annihilate with the relic cosmic neutrino
background $\nu\bar{\nu} \longrightarrow G_{kk}$ to produce bulk gravitons in
the extra dimensions. This will affect their attenuation. We compute the
contribution of these Kaluza-Klein excitations to the above processes and find
that for parameters of the theory constrained by supernova cooling, the
contribution does indeed become the dominant contribution above $\sqrt{s}
\simeq 300$ GeV.
| [
{
"created": "Thu, 4 May 2000 03:42:59 GMT",
"version": "v1"
},
{
"created": "Wed, 20 Sep 2000 03:14:37 GMT",
"version": "v2"
}
] | 2009-10-31 | [
[
"Goyal",
"Ashok",
"",
"Delhi University"
],
[
"Gupta",
"Abhinav",
"",
"Delhi University"
],
[
"Mahajan",
"Namit",
"",
"Delhi University"
]
] | If the neutrinos are to be identified with the primary source of ultra-high energy cosmic rays(UHECR), their interaction on relic neutrinos is of great importance in understanding their long intergalactic journey. In theories with large compact dimensions, the exchange of a tower of massive spin-2 gravitons (Kaluza-Klein excitations) gives extra contribution to $\nu\bar{\nu} \longrightarrow f\bar{f}$ and $\gamma\gamma$ processes along with the opening of a new channel for the neutrinos to annihilate with the relic cosmic neutrino background $\nu\bar{\nu} \longrightarrow G_{kk}$ to produce bulk gravitons in the extra dimensions. This will affect their attenuation. We compute the contribution of these Kaluza-Klein excitations to the above processes and find that for parameters of the theory constrained by supernova cooling, the contribution does indeed become the dominant contribution above $\sqrt{s} \simeq 300$ GeV. |
hep-ph/9408322 | Yoshio Yamagishi | T.Kobayashi, D.Suematsu, K.Yamada and Y.Yamagishi | Non-universal Soft Scalar Masses in Superstring Theories | 16 pages,LaTeX file KANAZAWA-94-16 | Phys.Lett. B348 (1995) 402-410 | 10.1016/0370-2693(95)00194-P | null | hep-ph | null | We study soft scalar masses comparing with gaugino masses in 4-dimensional
string models. In general non-universal soft masses are derived in orbifold
models. We give conditions on modular weights to lead to the large
non-universality in the soft scalar masses. This non-universality is applied to
the unification of the gauge coupling constants in the minimal string model.
| [
{
"created": "Fri, 19 Aug 1994 07:07:59 GMT",
"version": "v1"
},
{
"created": "Tue, 6 Sep 1994 06:37:28 GMT",
"version": "v2"
}
] | 2009-10-28 | [
[
"Kobayashi",
"T.",
""
],
[
"Suematsu",
"D.",
""
],
[
"Yamada",
"K.",
""
],
[
"Yamagishi",
"Y.",
""
]
] | We study soft scalar masses comparing with gaugino masses in 4-dimensional string models. In general non-universal soft masses are derived in orbifold models. We give conditions on modular weights to lead to the large non-universality in the soft scalar masses. This non-universality is applied to the unification of the gauge coupling constants in the minimal string model. |
2406.15640 | Daniel Reichelt | Shankha Banerjee, Daniel Reichelt, Michael Spannowsky | Electroweak Corrections and EFT Operators in $W^+W^-$ production at the
LHC | 14 pages, 4 figures, 6 tables | null | null | IPPP/24/34 MCNET-24-11 | hep-ph hep-ex | http://creativecommons.org/licenses/by-nc-sa/4.0/ | We investigate the impact of electroweak corrections and Effective Field
Theory operators on $W^+W^-$ production at the Large Hadron Collider (LHC).
Utilising the Standard Model Effective Field Theory (SMEFT) framework, we
extend the Standard Model by incorporating higher-dimensional operators to
encapsulate potential new physics effects. These operators allow for a
model-independent approach to data interpretation, essential for probing beyond
the Standard Model physics. We generate pseudo data at the next-to-leading
order in Quantum Chromodynamics and include approximate electroweak
corrections. Our analysis focuses on the interplay between these corrections
and SMEFT operators at leading order. The inclusion of electroweak corrections
is crucial as they can counteract the effects predicted by SMEFT operators,
necessitating precise theoretical and experimental handling. By examining $pp
\to W^+W^-$ production, a process sensitive to the electroweak
symmetry-breaking mechanism, we demonstrate the importance of these corrections
in isolating and interpreting new physics signatures. Our results highlight the
significant role of electroweak corrections in enhancing the interpretative
power of LHC data and in obtaining reliable constraints on new physics
interactions.
| [
{
"created": "Fri, 21 Jun 2024 20:35:18 GMT",
"version": "v1"
}
] | 2024-06-25 | [
[
"Banerjee",
"Shankha",
""
],
[
"Reichelt",
"Daniel",
""
],
[
"Spannowsky",
"Michael",
""
]
] | We investigate the impact of electroweak corrections and Effective Field Theory operators on $W^+W^-$ production at the Large Hadron Collider (LHC). Utilising the Standard Model Effective Field Theory (SMEFT) framework, we extend the Standard Model by incorporating higher-dimensional operators to encapsulate potential new physics effects. These operators allow for a model-independent approach to data interpretation, essential for probing beyond the Standard Model physics. We generate pseudo data at the next-to-leading order in Quantum Chromodynamics and include approximate electroweak corrections. Our analysis focuses on the interplay between these corrections and SMEFT operators at leading order. The inclusion of electroweak corrections is crucial as they can counteract the effects predicted by SMEFT operators, necessitating precise theoretical and experimental handling. By examining $pp \to W^+W^-$ production, a process sensitive to the electroweak symmetry-breaking mechanism, we demonstrate the importance of these corrections in isolating and interpreting new physics signatures. Our results highlight the significant role of electroweak corrections in enhancing the interpretative power of LHC data and in obtaining reliable constraints on new physics interactions. |
1507.07215 | Matteo Giordano | Matteo Giordano (Debrecen, Inst. Nucl. Res.) and Enrico Meggiolaro
(Pisa U. & INFN, Pisa) | Remarks on the static dipole-dipole potential at large distances | Revised version; improved discussion of the choice of the Euclidean
time direction, of the time-ordering of the Wilson loop, and of the
comparison of our results with existing nonperturbative calculations; two
references added. To appear in PRD. 30 pages, 2 figures | Phys. Rev. D 92, 096007 (2015) | 10.1103/PhysRevD.92.096007 | IFUP-TH/2015 | hep-ph hep-lat hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We determine the large-distance behaviour of the static dipole-dipole
potential for a wide class of gauge theories on nonperturbative grounds,
exploiting only general properties of the theory. In the case of QCD, we
recover the known results in the regime of small dipole sizes, and discuss
recent nonperturbative calculations. Moreover, we discuss the case of
pure-gauge theories, and compare our prediction with the available lattice
results.
| [
{
"created": "Sun, 26 Jul 2015 16:09:08 GMT",
"version": "v1"
},
{
"created": "Tue, 3 Nov 2015 11:06:37 GMT",
"version": "v2"
}
] | 2015-11-11 | [
[
"Giordano",
"Matteo",
"",
"Debrecen, Inst. Nucl. Res."
],
[
"Meggiolaro",
"Enrico",
"",
"Pisa U. & INFN, Pisa"
]
] | We determine the large-distance behaviour of the static dipole-dipole potential for a wide class of gauge theories on nonperturbative grounds, exploiting only general properties of the theory. In the case of QCD, we recover the known results in the regime of small dipole sizes, and discuss recent nonperturbative calculations. Moreover, we discuss the case of pure-gauge theories, and compare our prediction with the available lattice results. |
hep-ph/9402272 | Michael Bergmann | N. G. Stefanis and M. Bergmann | On Proton and Delta Wave Functions | 8 pages, RUB-TPII-46/93 | null | null | null | hep-ph | null | Physical wave functions for the nucleon and the $\Delta^{+}$ isobar are
presented, which unify the best features of previous models. With these wave
functions we can calculate elastic form factors and the decays of the
charmonium levels ${}^{3}S_{1}$, ${}^{3}P_{1}$, ${}^{3}P_{2}$ into $p\bar p$ in
agreement with the data. A striking scaling behavior between
$R=|G_{\text{M}}^{\text{n}}|/G_{\text{M}}^{\text{p}}$ and the coefficient
$B_{4}$ of the Appell polynomial decomposition of the nucleon distribution
amplitude is found; the implications for elastic nucleon cross sections are
discussed.
| [
{
"created": "Fri, 11 Feb 1994 13:44:24 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Stefanis",
"N. G.",
""
],
[
"Bergmann",
"M.",
""
]
] | Physical wave functions for the nucleon and the $\Delta^{+}$ isobar are presented, which unify the best features of previous models. With these wave functions we can calculate elastic form factors and the decays of the charmonium levels ${}^{3}S_{1}$, ${}^{3}P_{1}$, ${}^{3}P_{2}$ into $p\bar p$ in agreement with the data. A striking scaling behavior between $R=|G_{\text{M}}^{\text{n}}|/G_{\text{M}}^{\text{p}}$ and the coefficient $B_{4}$ of the Appell polynomial decomposition of the nucleon distribution amplitude is found; the implications for elastic nucleon cross sections are discussed. |
2403.09487 | Lianbao Jia | Lian-Bao Jia | Tamed loops: A try for non-renormalizable Einstein gravity in UV-free
scheme | 8 pages, 2 figures. Two-loop vertex of graviton evaluated, a
Supplement added | null | null | null | hep-ph gr-qc | http://creativecommons.org/licenses/by-nc-nd/4.0/ | How to describe loop corrections is a fundamental challenge in the
quantization of Einstein gravity. In this paper, we give it a try in UV-free
scheme, and the result seems to be effective for graviton loops. This indicates
that both loops of the renormalizable Standard Model and the non-renormalizable
Einstein gravity can be described by the method of UV-free scheme.
| [
{
"created": "Thu, 14 Mar 2024 15:29:21 GMT",
"version": "v1"
},
{
"created": "Thu, 23 May 2024 11:56:47 GMT",
"version": "v2"
}
] | 2024-05-24 | [
[
"Jia",
"Lian-Bao",
""
]
] | How to describe loop corrections is a fundamental challenge in the quantization of Einstein gravity. In this paper, we give it a try in UV-free scheme, and the result seems to be effective for graviton loops. This indicates that both loops of the renormalizable Standard Model and the non-renormalizable Einstein gravity can be described by the method of UV-free scheme. |
hep-ph/9508318 | Leonid Razumov | Leonid V. Razumov and Hans Feldmeier, (Gesellshaft fuer Schwerionen
Forschung, GSI) | Photon Intensity Interferometry for Expanding Sources | LaTeX209, 12 pages, 2 PostScript figures, requires 'epsfig.sty'. More
information is available at http://www.gsi.de/groups/the/razumov.html | null | 10.1016/0370-2693(96)00323-1 | GSI-Preprint-95-46 | hep-ph nucl-th | null | Using Quantum Field Theory we derive a general formula for the double
inclusive spectra of photons radiated by a system in local equilibrium. The
derived expression differs significantly from the one mostly used up to now in
photon intensity interferometry of heavy--ion collisions. We present a
covariant expression for double inclusive spectra adapted for usage in
numerical simulations. Application to a schematic model with a Bj\o rken type
expansion gives strong evidence for the need of reinvestigating photon--photon
correlations for expanding sources.
| [
{
"created": "Thu, 17 Aug 1995 12:35:59 GMT",
"version": "v1"
},
{
"created": "Thu, 5 Oct 1995 15:52:36 GMT",
"version": "v2"
}
] | 2009-10-28 | [
[
"Razumov",
"Leonid V.",
""
],
[
"Feldmeier",
"Hans",
""
]
] | Using Quantum Field Theory we derive a general formula for the double inclusive spectra of photons radiated by a system in local equilibrium. The derived expression differs significantly from the one mostly used up to now in photon intensity interferometry of heavy--ion collisions. We present a covariant expression for double inclusive spectra adapted for usage in numerical simulations. Application to a schematic model with a Bj\o rken type expansion gives strong evidence for the need of reinvestigating photon--photon correlations for expanding sources. |
1405.3876 | Zhun Lu | Wenjuan Mao, Zhun Lu, Bo-Qiang Ma | Transverse single-spin asymmetries of pion production in semi-inclusive
DIS at subleading twist | 11 pages, 12 figures, version published in PRD | Phys.Rev.D 90,014048 (2014) | 10.1103/PhysRevD.90.014048 | null | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the single-spin asymmetries with the $\sin\phi_S$ and $\sin(2\phi_h
-\phi_S)$ angular dependences for charged and neutral pions produced in
semi-inclusive deep inelastic scattering on the transversely polarized proton
target. The theoretical interpretations of the two asymmetries are presented in
terms of the convolution of the twist-3 quark transverse momentum dependent
distributions and twist-2 fragmentation functions. Specifically, we investigate
the role of the distributions $f_T$, $h_T$ and $h_T^\perp$ in the $\sin\phi_S$
asymmetry, as well as the role of the distributions $f_T^\perp$, $h_T$ and
$h_T^\perp$ in the $\sin(2\phi_h -\phi_S)$ asymmetry. We calculate these
distributions in a spectator-diquark model and predict the corresponding
asymmetries for the first time, considering the kinematics at HERMES, JLab and
COMPASS. The numerical estimates show that the asymmetries are sizable, and the
dominant contribution to the $\sin\phi_S$ asymmetry comes from the T-odd
distribution $f_T$, while $f_T^\perp$ gives the main contribution to the
$\sin(2\phi_h -\phi_S)$ asymmetry. The future measurements on these asymmetries
can shed light on the information of twist-3 transverse momentum dependent
distributions.
| [
{
"created": "Thu, 15 May 2014 15:03:19 GMT",
"version": "v1"
},
{
"created": "Sun, 18 May 2014 06:57:12 GMT",
"version": "v2"
},
{
"created": "Thu, 25 Sep 2014 11:55:23 GMT",
"version": "v3"
}
] | 2014-09-26 | [
[
"Mao",
"Wenjuan",
""
],
[
"Lu",
"Zhun",
""
],
[
"Ma",
"Bo-Qiang",
""
]
] | We study the single-spin asymmetries with the $\sin\phi_S$ and $\sin(2\phi_h -\phi_S)$ angular dependences for charged and neutral pions produced in semi-inclusive deep inelastic scattering on the transversely polarized proton target. The theoretical interpretations of the two asymmetries are presented in terms of the convolution of the twist-3 quark transverse momentum dependent distributions and twist-2 fragmentation functions. Specifically, we investigate the role of the distributions $f_T$, $h_T$ and $h_T^\perp$ in the $\sin\phi_S$ asymmetry, as well as the role of the distributions $f_T^\perp$, $h_T$ and $h_T^\perp$ in the $\sin(2\phi_h -\phi_S)$ asymmetry. We calculate these distributions in a spectator-diquark model and predict the corresponding asymmetries for the first time, considering the kinematics at HERMES, JLab and COMPASS. The numerical estimates show that the asymmetries are sizable, and the dominant contribution to the $\sin\phi_S$ asymmetry comes from the T-odd distribution $f_T$, while $f_T^\perp$ gives the main contribution to the $\sin(2\phi_h -\phi_S)$ asymmetry. The future measurements on these asymmetries can shed light on the information of twist-3 transverse momentum dependent distributions. |
1011.5090 | Kevork Abazajian | Kevork N. Abazajian, Steve Blanchet, J. Patrick Harding | Current and Future Constraints on Dark Matter from Prompt and
Inverse-Compton Photon Emission in the Isotropic Diffuse Gamma-ray Background | 10 pages, 5 figures; v3: added discussion, matches version in PRD | Phys. Rev. D 85, 043509 (2012) | 10.1103/PhysRevD.85.043509 | UMD-PP-10-020 | hep-ph astro-ph.CO astro-ph.HE | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We perform a detailed examination of current constraints on annihilating and
decaying dark matter models from both prompt and inverse-Compton emission
photons, including both model-dependent and model-independent bounds. We also
show that the observed isotropic diffuse gamma-ray background (DGRB), which
provides one of the most conservative constraints on models of annihilating
weak-scale dark matter particles, may enhance its sensitivity by a factor of ~2
to 3 (95% C.L.) as the Fermi-LAT experiment resolves DGRB contributing blazar
sources with five years of observation. For our forecasts, we employ the
results of constraints to the luminosity-dependent density evolution plus
blazar spectral energy distribution sequence model, which is constrained by the
DGRB and blazar source count distribution function.
| [
{
"created": "Tue, 23 Nov 2010 13:27:06 GMT",
"version": "v1"
},
{
"created": "Fri, 13 May 2011 18:33:08 GMT",
"version": "v2"
},
{
"created": "Wed, 8 Feb 2012 18:21:30 GMT",
"version": "v3"
}
] | 2012-02-13 | [
[
"Abazajian",
"Kevork N.",
""
],
[
"Blanchet",
"Steve",
""
],
[
"Harding",
"J. Patrick",
""
]
] | We perform a detailed examination of current constraints on annihilating and decaying dark matter models from both prompt and inverse-Compton emission photons, including both model-dependent and model-independent bounds. We also show that the observed isotropic diffuse gamma-ray background (DGRB), which provides one of the most conservative constraints on models of annihilating weak-scale dark matter particles, may enhance its sensitivity by a factor of ~2 to 3 (95% C.L.) as the Fermi-LAT experiment resolves DGRB contributing blazar sources with five years of observation. For our forecasts, we employ the results of constraints to the luminosity-dependent density evolution plus blazar spectral energy distribution sequence model, which is constrained by the DGRB and blazar source count distribution function. |
hep-ph/0612157 | Jonathan Feng | Jose A. R. Cembranos, Jonathan L. Feng, Louis E. Strigari | Exotic Collider Signals from the Complete Phase Diagram of Minimal
Universal Extra Dimensions | 21 pages, 8 figures | Phys.Rev.D75:036004,2007 | 10.1103/PhysRevD.75.036004 | UCI-TR-2006-21 | hep-ph astro-ph hep-ex | null | Minimal universal extra dimensions (mUED) is often thought to predict that
the lightest Kaluza-Klein particle (LKP) is the Kaluza-Klein gauge boson B^1,
leading to conventional missing energy signals at colliders and WIMP dark
matter. In fact, the implications of mUED are far richer: the B^1, charged
Higgs boson H^{\pm 1}, and graviton G^1 are all possible LKPs, leading to many
different ``phases'' with distinct signatures. Considering the complete phase
diagram, we find predictions for charged or neutral particles with decay
lengths of microns to tens of meters; WIMP, superWIMP, or charged relic
particles; metastable particles with lifetimes of the order of or in excess of
the age of the universe; and scenarios combining two or more of these
phenomena. In the cosmologically preferred region, the Higgs boson mass is
between 180 and 245 GeV, the LKP mass is between 810 and 1400 GeV, and the
maximal splitting between first Kaluza-Klein modes is less than 320 GeV. This
region predicts a variety of exotic collider signals, such as slow charged
particles, displaced vertices, tracks with non-vanishing impact parameters,
track kinks, and even vanishing charged tracks, all of which provide early
discovery possibilities at the Large Hadron Collider.
| [
{
"created": "Wed, 13 Dec 2006 18:46:50 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Cembranos",
"Jose A. R.",
""
],
[
"Feng",
"Jonathan L.",
""
],
[
"Strigari",
"Louis E.",
""
]
] | Minimal universal extra dimensions (mUED) is often thought to predict that the lightest Kaluza-Klein particle (LKP) is the Kaluza-Klein gauge boson B^1, leading to conventional missing energy signals at colliders and WIMP dark matter. In fact, the implications of mUED are far richer: the B^1, charged Higgs boson H^{\pm 1}, and graviton G^1 are all possible LKPs, leading to many different ``phases'' with distinct signatures. Considering the complete phase diagram, we find predictions for charged or neutral particles with decay lengths of microns to tens of meters; WIMP, superWIMP, or charged relic particles; metastable particles with lifetimes of the order of or in excess of the age of the universe; and scenarios combining two or more of these phenomena. In the cosmologically preferred region, the Higgs boson mass is between 180 and 245 GeV, the LKP mass is between 810 and 1400 GeV, and the maximal splitting between first Kaluza-Klein modes is less than 320 GeV. This region predicts a variety of exotic collider signals, such as slow charged particles, displaced vertices, tracks with non-vanishing impact parameters, track kinks, and even vanishing charged tracks, all of which provide early discovery possibilities at the Large Hadron Collider. |
2007.14262 | Ahmed Ayad | Ahmed Ayad and Geoff Beck | Potential of SKA to Detect CDM ALPs with Radio Astronomy | This work is a proceeding submitted to the International Conference
on Neutrinos and Dark Matter (NDM)-2020 | null | null | null | hep-ph astro-ph.HE | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Axion-like particles (ALPs) are light pseudo-scalar particles predicted in
many theoretically well-motivated extensions to the standard model of particle
physics (SM). The search for cold dark matter (CDM) ALPs has gained tremendous
ground over the last few years. Essentially ALPs are characterized by their
coupling with two photons which allows ALPs to decay into two photons. In this
work, we explore the potential of the Square Kilometer Array (SKA) to detect
CDM ALPs with radio astronomy in an attempt to detect an observational
signature of ALPs conversion onto photons in astrophysical field.
| [
{
"created": "Fri, 24 Jul 2020 18:27:13 GMT",
"version": "v1"
}
] | 2020-07-29 | [
[
"Ayad",
"Ahmed",
""
],
[
"Beck",
"Geoff",
""
]
] | Axion-like particles (ALPs) are light pseudo-scalar particles predicted in many theoretically well-motivated extensions to the standard model of particle physics (SM). The search for cold dark matter (CDM) ALPs has gained tremendous ground over the last few years. Essentially ALPs are characterized by their coupling with two photons which allows ALPs to decay into two photons. In this work, we explore the potential of the Square Kilometer Array (SKA) to detect CDM ALPs with radio astronomy in an attempt to detect an observational signature of ALPs conversion onto photons in astrophysical field. |
hep-ph/9903400 | Antonio Delgado | A. Delgado, M. Quiros | Strong coupling unification and extra dimensions | 20 pages, Latex2e, 5 figures, new refs, figure corrected | Nucl.Phys.B559:235-254,1999 | 10.1016/S0550-3213(99)00440-X | IEM-FT-189/99, IFT-UAM/CSIC-99-9 | hep-ph hep-th | null | We analyze the implications of electroweak and strong coupling unification in
a very general class of models extending the minimal supersymmetric standard
model in $4+p$ dimensions $(p\geq 0)$. In general, electroweak precision data
require the presence of large extra dimensions (low compactification scales,
$M_c$) and/or low unification scale, $M_U$. In particular, the actual
experimental value of the strong coupling at $M_Z$ imposes an upper bound on
the compactification and unification scales. In four dimensional theories
($M_c\simeq M_U$) with canonical hypercharge assignment we find $M_U\lesssim
10^{9}$ GeV. In theories with extra dimensions ($M_c<M_U$) we find $M_c\lesssim
10^7$ GeV, for a supersymmetric spectrum at the TeV scale.
| [
{
"created": "Thu, 18 Mar 1999 14:30:42 GMT",
"version": "v1"
},
{
"created": "Tue, 20 Apr 1999 11:15:04 GMT",
"version": "v2"
}
] | 2008-11-26 | [
[
"Delgado",
"A.",
""
],
[
"Quiros",
"M.",
""
]
] | We analyze the implications of electroweak and strong coupling unification in a very general class of models extending the minimal supersymmetric standard model in $4+p$ dimensions $(p\geq 0)$. In general, electroweak precision data require the presence of large extra dimensions (low compactification scales, $M_c$) and/or low unification scale, $M_U$. In particular, the actual experimental value of the strong coupling at $M_Z$ imposes an upper bound on the compactification and unification scales. In four dimensional theories ($M_c\simeq M_U$) with canonical hypercharge assignment we find $M_U\lesssim 10^{9}$ GeV. In theories with extra dimensions ($M_c<M_U$) we find $M_c\lesssim 10^7$ GeV, for a supersymmetric spectrum at the TeV scale. |
1308.2738 | Zhen Liu | Tao Han, Paul Langacker, Zhen Liu and Lian-Tao Wang | Diagnosis of a New Neutral Gauge Boson at the LHC and ILC for Snowmass
2013 | 24 pages, 4 figures. White paper prepared for Snowmass 2013 | null | null | null | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A U(1)' or Z' is generic in many scenarios of physics beyond the Standard
Model, such as string theory compactifications, GUTs, extra-dimensions,
compositeness, dynamical electroweak symmetry breaking, dark-sector models,
etc. We study the potential of probing a TeV-scale Z' with electroweak
couplings in future experiments. In particular, we focus on two scenarios: (1)
If a Z' is discovered at the LHC, what is the potential of measuring its mass
and width and to distinguish between benchmark models utilizing various
observables, especially asymmetries, at a high luminosity LHC and the ILC. (2)
If the Z' is not accessible as a clear resonance signal, what is the exclusion
reach at the ILC.
| [
{
"created": "Tue, 13 Aug 2013 02:05:07 GMT",
"version": "v1"
}
] | 2013-08-14 | [
[
"Han",
"Tao",
""
],
[
"Langacker",
"Paul",
""
],
[
"Liu",
"Zhen",
""
],
[
"Wang",
"Lian-Tao",
""
]
] | A U(1)' or Z' is generic in many scenarios of physics beyond the Standard Model, such as string theory compactifications, GUTs, extra-dimensions, compositeness, dynamical electroweak symmetry breaking, dark-sector models, etc. We study the potential of probing a TeV-scale Z' with electroweak couplings in future experiments. In particular, we focus on two scenarios: (1) If a Z' is discovered at the LHC, what is the potential of measuring its mass and width and to distinguish between benchmark models utilizing various observables, especially asymmetries, at a high luminosity LHC and the ILC. (2) If the Z' is not accessible as a clear resonance signal, what is the exclusion reach at the ILC. |
1406.3932 | Sergey Bondarenko | S.Bondarenko, K.Komoshvili | Transport properties of a charged drop in an external electric field | 18 pages | null | 10.1142/S0218301315500342 | null | hep-ph nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Transport properties of a charged droplet of weakly interacting particles in
an external field are investigated. A non-equilibrium distribution function
which describes a process of the droplet transverse evolution with constant
entropy in an external electric field is calculated. With the help of this
distribution function, shear viscosity coefficients in the transverse plane are
calculated as well. They are found to be very small and depend on the time of
the droplet's expansion in a hydrodynamical regime and external field value. An
applicability of the results to the description of initial states of
quark-gluon plasma obtained in high-energy interactions of nuclei is also
discussed.
| [
{
"created": "Mon, 16 Jun 2014 08:36:52 GMT",
"version": "v1"
},
{
"created": "Sun, 19 Oct 2014 09:44:45 GMT",
"version": "v2"
}
] | 2015-06-11 | [
[
"Bondarenko",
"S.",
""
],
[
"Komoshvili",
"K.",
""
]
] | Transport properties of a charged droplet of weakly interacting particles in an external field are investigated. A non-equilibrium distribution function which describes a process of the droplet transverse evolution with constant entropy in an external electric field is calculated. With the help of this distribution function, shear viscosity coefficients in the transverse plane are calculated as well. They are found to be very small and depend on the time of the droplet's expansion in a hydrodynamical regime and external field value. An applicability of the results to the description of initial states of quark-gluon plasma obtained in high-energy interactions of nuclei is also discussed. |
hep-ph/0412260 | Christian Weiss | L. Frankfurt, M. Strikman, C. Weiss, M. Zhalov | Transverse structure of strong interactions at LHC: From diffraction to
new particle production | 12 pages, 11 figures. To appear in the proceedings of "Physics at
LHC", Vienna, Austria, July 13-17, 2004 | Czech.J.Phys.55:B675-B692,2005 | null | JLAB-THY-04-311 | hep-ph hep-ex | null | We discuss the global structure of pp events at LHC with hard processes
(particle production in two-parton collisions) on the basis of the transverse
spatial characteristics of the partonic initial state. Studies of hard
exclusive processes in ep scattering have shown that the transverse area
occupied by partons with x >= 10^{-2} is much smaller than the size of the
nucleon as it appears in generic inelastic pp collisions at high energies
("two-scale picture"). We show that this is consistent with the observation
that the elastic pp amplitude at the Tevatron energy is close to the black body
limit at small impact parameters. Our picture implies that inclusive heavy
particle production (Higgs, SUSY) happens only in central pp collisions. At LHC
energies, the final state characteristics of such events are strongly
influenced by the approach to the black body limit, and thus may differ
substantially from what one expects based on the extrapolation of Tevatron
results. Our two-scale picture also allows us to analyze several types of hard
diffractive processes observable at LHC: i) Diffractive proton dissociation
into three jets, which probes small-size configurations in the proton wave
function; ii) exclusive diffractive Higgs production, in which we estimate the
rapidity gap survival probability; iii) inclusive diffractive processes.
| [
{
"created": "Fri, 17 Dec 2004 20:26:40 GMT",
"version": "v1"
},
{
"created": "Sat, 18 Dec 2004 21:17:55 GMT",
"version": "v2"
}
] | 2014-11-18 | [
[
"Frankfurt",
"L.",
""
],
[
"Strikman",
"M.",
""
],
[
"Weiss",
"C.",
""
],
[
"Zhalov",
"M.",
""
]
] | We discuss the global structure of pp events at LHC with hard processes (particle production in two-parton collisions) on the basis of the transverse spatial characteristics of the partonic initial state. Studies of hard exclusive processes in ep scattering have shown that the transverse area occupied by partons with x >= 10^{-2} is much smaller than the size of the nucleon as it appears in generic inelastic pp collisions at high energies ("two-scale picture"). We show that this is consistent with the observation that the elastic pp amplitude at the Tevatron energy is close to the black body limit at small impact parameters. Our picture implies that inclusive heavy particle production (Higgs, SUSY) happens only in central pp collisions. At LHC energies, the final state characteristics of such events are strongly influenced by the approach to the black body limit, and thus may differ substantially from what one expects based on the extrapolation of Tevatron results. Our two-scale picture also allows us to analyze several types of hard diffractive processes observable at LHC: i) Diffractive proton dissociation into three jets, which probes small-size configurations in the proton wave function; ii) exclusive diffractive Higgs production, in which we estimate the rapidity gap survival probability; iii) inclusive diffractive processes. |
hep-ph/0409116 | David Blaschke | D. Blaschke (Bielefeld & Dubna), H. Grigorian (Rostock & Yerevan), A.
Khalatyan (Potsdam), D.N. Voskresensky (Darmstadt & Moscow) | Exploring the QCD phase diagram with compact stars | 6 pages, 5 figures, to appear in the proceedings of the Workshop on
QCD Down Under, Barossa Valley and Adelaide, Australia, 10-19 Mar 2004 | Nucl. Phys. B (Proc. Suppl.) 141 (2005) 137 - 142 | 10.1016/j.nuclphysbps.2004.12.021 | null | hep-ph | null | We investigate a nonlocal chiral quark model with separable 4-fermion
interaction for the case of U(3) flavor symmetry and show that strange quark
matter is unlikely to occur in a large enough volume of a compact star to
entail remarkable observational consequences. The phase diagram in the
two-flavor sector of such model has a critical end point of the line of first
order chiral/deconfinement phase transitions on which a triple point marks the
junction with the critical line for second order phase transitions to
two-flavor color superconductivity (2SC) below T~80 MeV. Stable hybrid star
configurations with large quark matter core in a color superconducting phase
can exist. A consistent cooling phenomenology requires that all quark species
be gapped, the minimal pairing gap of the order of 10 - 100 keV.
| [
{
"created": "Thu, 9 Sep 2004 19:36:05 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Blaschke",
"D.",
"",
"Bielefeld & Dubna"
],
[
"Grigorian",
"H.",
"",
"Rostock & Yerevan"
],
[
"Khalatyan",
"A.",
"",
"Potsdam"
],
[
"Voskresensky",
"D. N.",
"",
"Darmstadt & Moscow"
]
] | We investigate a nonlocal chiral quark model with separable 4-fermion interaction for the case of U(3) flavor symmetry and show that strange quark matter is unlikely to occur in a large enough volume of a compact star to entail remarkable observational consequences. The phase diagram in the two-flavor sector of such model has a critical end point of the line of first order chiral/deconfinement phase transitions on which a triple point marks the junction with the critical line for second order phase transitions to two-flavor color superconductivity (2SC) below T~80 MeV. Stable hybrid star configurations with large quark matter core in a color superconducting phase can exist. A consistent cooling phenomenology requires that all quark species be gapped, the minimal pairing gap of the order of 10 - 100 keV. |
hep-ph/9409229 | null | David Atwood, Gad Eilam, Michael Gronau and Amarjit Soni | Enhancement of CP Violation in B^+- to K_i^+- D^0 By Resonant Effects | 11 pages | Phys.Lett.B341:372-378,1995 | 10.1016/0370-2693(94)01317-6 | CERN-TH.7428/94; SLAC-PUB-6655 | hep-ph | null | Resonance width effects in charged $B$ decays to neutral $D$ mesons and
excited kaon states $K_i$ around 1400 MeV are shown to lead to large calculable
final state phases. $CP$ asymmetries are defined for any charged $B$ decay to
three pseudoscalar mesons involving intermediate overlapping resonance states.
Asymmetries up to about 10$\%$ are found in $B^+\to K^+_i D^0\to (K\pi)^+ D^0$.
Decay distributions can be used to determine the weak phase $\gamma$ of the
Cabibbo-Kobayashi-Maskawa (CKM) matrix. No separation of the contributions from
individual resonances is required.
| [
{
"created": "Tue, 6 Sep 1994 03:37:05 GMT",
"version": "v1"
}
] | 2010-11-01 | [
[
"Atwood",
"David",
""
],
[
"Eilam",
"Gad",
""
],
[
"Gronau",
"Michael",
""
],
[
"Soni",
"Amarjit",
""
]
] | Resonance width effects in charged $B$ decays to neutral $D$ mesons and excited kaon states $K_i$ around 1400 MeV are shown to lead to large calculable final state phases. $CP$ asymmetries are defined for any charged $B$ decay to three pseudoscalar mesons involving intermediate overlapping resonance states. Asymmetries up to about 10$\%$ are found in $B^+\to K^+_i D^0\to (K\pi)^+ D^0$. Decay distributions can be used to determine the weak phase $\gamma$ of the Cabibbo-Kobayashi-Maskawa (CKM) matrix. No separation of the contributions from individual resonances is required. |
1911.09109 | Ivan Esteban | Pilar Coloma, Ivan Esteban, M. C. Gonzalez-Garcia, Michele Maltoni | Improved global fit to Non-Standard neutrino Interactions using COHERENT
energy and timing data | 25 pages, 9 figures, 2 tables. Added an appendix with updated results
accounting for the data available in July 2020 | null | 10.1007/JHEP02(2020)023 | YITP-SB-19-38, IFT-UAM/CSIC-19-152, IFIC-19-49 | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We perform a global fit to neutrino oscillation and coherent neutrino-nucleus
scattering data, using both timing and energy information from the COHERENT
experiment. The results are used to set model-independent bounds on
four-fermion effective operators inducing non-standard neutral-current neutrino
interactions. We quantify the allowed ranges for their Wilson coefficients, as
well as the status of the LMA-D solution, for a wide class of new physics
models with arbitrary ratios between the strength of the operators involving up
and down quarks. Our results are presented for the COHERENT experiment alone,
as well as in combination with the global data from oscillation experiments. We
also quantify the dependence of our results for COHERENT with respect to the
choice of quenching factor, nuclear form factor, and the treatment of the
backgrounds.
| [
{
"created": "Wed, 20 Nov 2019 19:00:00 GMT",
"version": "v1"
},
{
"created": "Fri, 28 Feb 2020 11:55:02 GMT",
"version": "v2"
},
{
"created": "Fri, 2 Oct 2020 13:43:40 GMT",
"version": "v3"
}
] | 2020-10-05 | [
[
"Coloma",
"Pilar",
""
],
[
"Esteban",
"Ivan",
""
],
[
"Gonzalez-Garcia",
"M. C.",
""
],
[
"Maltoni",
"Michele",
""
]
] | We perform a global fit to neutrino oscillation and coherent neutrino-nucleus scattering data, using both timing and energy information from the COHERENT experiment. The results are used to set model-independent bounds on four-fermion effective operators inducing non-standard neutral-current neutrino interactions. We quantify the allowed ranges for their Wilson coefficients, as well as the status of the LMA-D solution, for a wide class of new physics models with arbitrary ratios between the strength of the operators involving up and down quarks. Our results are presented for the COHERENT experiment alone, as well as in combination with the global data from oscillation experiments. We also quantify the dependence of our results for COHERENT with respect to the choice of quenching factor, nuclear form factor, and the treatment of the backgrounds. |
hep-ph/0512001 | Deborah Nancy Aguilera | D. N. Aguilera and D. B. Blaschke | Nonlocality effects on spin-one pairing patterns in two-flavor color
superconducting quark matter and compact stars applications | 18 pages, 7 figures, corrected version with revised parameterization | Phys.Part.Nucl.Lett.4:205-212,2007 | 10.1134/S1547477107030016 | null | hep-ph astro-ph nucl-th | null | We study the influence of nonlocality in the interaction on two spin one
pairing patterns of two-flavor quark matter: the anisotropic blue color paring
besides the usual two color superconducting matter (2SCb), in which red and
green colors are paired, and the color spin locking phase (CSL). The effect of
nonlocality on the gaps is rather large and the pairings exhibit a strong
dependence on the form factor of the interaction, especially in the low density
region. The application of these small spin-one condensates for compact stars
is analyzed: the early onset of quark matter in the nonlocal models may help to
stabilize hybrid star configurations. While the anisotropic blue quark pairing
does not survive a big asymmetry in flavor space as imposed by the charge
neutrality condition, the CSL phase as a flavor independent pairing can be
realized as neutral matter in compact star cores. However, smooth form factors
and the missmatch between the flavor chemical potential in neutral matter make
the effective gaps of the order of magnitude $\simeq 10$ keV, and a more
systematic analysis is needed to decide whether such small gaps could be
consistent with the cooling phenomenology.
| [
{
"created": "Wed, 30 Nov 2005 23:50:51 GMT",
"version": "v1"
},
{
"created": "Wed, 2 Aug 2006 20:51:46 GMT",
"version": "v2"
}
] | 2008-11-26 | [
[
"Aguilera",
"D. N.",
""
],
[
"Blaschke",
"D. B.",
""
]
] | We study the influence of nonlocality in the interaction on two spin one pairing patterns of two-flavor quark matter: the anisotropic blue color paring besides the usual two color superconducting matter (2SCb), in which red and green colors are paired, and the color spin locking phase (CSL). The effect of nonlocality on the gaps is rather large and the pairings exhibit a strong dependence on the form factor of the interaction, especially in the low density region. The application of these small spin-one condensates for compact stars is analyzed: the early onset of quark matter in the nonlocal models may help to stabilize hybrid star configurations. While the anisotropic blue quark pairing does not survive a big asymmetry in flavor space as imposed by the charge neutrality condition, the CSL phase as a flavor independent pairing can be realized as neutral matter in compact star cores. However, smooth form factors and the missmatch between the flavor chemical potential in neutral matter make the effective gaps of the order of magnitude $\simeq 10$ keV, and a more systematic analysis is needed to decide whether such small gaps could be consistent with the cooling phenomenology. |
hep-ph/0608296 | Rouzbeh Allahverdi | Rouzbeh Allahverdi, Anupam Mazumdar | Longevity of supersymmetric flat directions | 9 revtex pages, v3: expanded discussion on two flat directions, minor
modifications, conclusions unchanged | JCAP0708:023,2007 | 10.1088/1475-7516/2007/08/023 | null | hep-ph astro-ph gr-qc hep-th | null | We examine the fate of supersymmetric flat directions. We argue that the
non-perturbative decay of the flat direction via preheating is an unlikely
event. In order to address this issue, first we identify the physical degrees
of freedom and their masses in presence of a large flat direction VEV (Vacuum
Expectation Value). We explicitly show that the (complex) flat direction and
its fermionic partner are the only light {\it physical} fields in the spectrum.
If the flat direction VEV is much larger than the weak scale, and it has a
rotational motion, there will be no resonant particle production at all. The
case of multiple flat directions is more involved. We illustrate that in many
cases of physical interest, the situation becomes effectively the same as that
of a single flat direction, or collection of independent single directions. In
such cases preheating is not relevant. In an absence of a fast non-perturbative
decay, the flat direction survives long enough to affect thermalization in
supersymmetric models as described in hep-ph/0505050 and hep-ph/0512227. It can
also ``terminate'' an early stage of non-perturbative inflaton decay as
discussed in hep-ph/0603244.
| [
{
"created": "Mon, 28 Aug 2006 15:31:10 GMT",
"version": "v1"
},
{
"created": "Thu, 31 Aug 2006 12:07:03 GMT",
"version": "v2"
},
{
"created": "Mon, 21 May 2007 13:28:36 GMT",
"version": "v3"
}
] | 2008-11-26 | [
[
"Allahverdi",
"Rouzbeh",
""
],
[
"Mazumdar",
"Anupam",
""
]
] | We examine the fate of supersymmetric flat directions. We argue that the non-perturbative decay of the flat direction via preheating is an unlikely event. In order to address this issue, first we identify the physical degrees of freedom and their masses in presence of a large flat direction VEV (Vacuum Expectation Value). We explicitly show that the (complex) flat direction and its fermionic partner are the only light {\it physical} fields in the spectrum. If the flat direction VEV is much larger than the weak scale, and it has a rotational motion, there will be no resonant particle production at all. The case of multiple flat directions is more involved. We illustrate that in many cases of physical interest, the situation becomes effectively the same as that of a single flat direction, or collection of independent single directions. In such cases preheating is not relevant. In an absence of a fast non-perturbative decay, the flat direction survives long enough to affect thermalization in supersymmetric models as described in hep-ph/0505050 and hep-ph/0512227. It can also ``terminate'' an early stage of non-perturbative inflaton decay as discussed in hep-ph/0603244. |
2012.06584 | Lucas Johns | Lucas Johns and Seth Koren | Hydrogen Mixing as a Novel Mechanism for Colder Baryons in 21 cm
Cosmology | 6 pages, 4 figures | null | null | null | hep-ph astro-ph.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The anomalous 21 cm absorption feature reported by EDGES has galvanized the
study of scenarios in which dark matter (DM) siphons off thermal energy from
the Standard Model (SM) gas. In a departure from the much-discussed models that
achieve cooling by DM scattering directly with SM particles, we show that the
same end can be achieved through neutral atomic hydrogen $H$ mixing with a
degenerate dark sector state $H'$. An analysis of in-medium $H$-$H'$
oscillations reveals viable parameter space for generic types of $H'$-DM
interactions to provide the requisite cooling. This strategy stands in stark
contrast to other proposals in many respects, including its cosmological
dynamics, model building implications, and complementary observational
signatures.
| [
{
"created": "Fri, 11 Dec 2020 19:00:02 GMT",
"version": "v1"
}
] | 2020-12-15 | [
[
"Johns",
"Lucas",
""
],
[
"Koren",
"Seth",
""
]
] | The anomalous 21 cm absorption feature reported by EDGES has galvanized the study of scenarios in which dark matter (DM) siphons off thermal energy from the Standard Model (SM) gas. In a departure from the much-discussed models that achieve cooling by DM scattering directly with SM particles, we show that the same end can be achieved through neutral atomic hydrogen $H$ mixing with a degenerate dark sector state $H'$. An analysis of in-medium $H$-$H'$ oscillations reveals viable parameter space for generic types of $H'$-DM interactions to provide the requisite cooling. This strategy stands in stark contrast to other proposals in many respects, including its cosmological dynamics, model building implications, and complementary observational signatures. |
1111.7160 | Gilberto Colangelo | Irinel Caprini, Gilberto Colangelo and Heinrich Leutwyler | Regge analysis of the pi pi scattering amplitude | 27 pages, 16 figures - v2 coincides with the published version apart
from a footnote on p. 14 which has been added after publication, in August
2012 | Eur.Phys.J. C72 (2012) 1860 | 10.1140/epjc/s10052-012-1860-1 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The theoretical predictions for the subtraction constants lead to a very
accurate dispersive representation of the pi pi scattering amplitude below 0.8
GeV. The extension of this representation up to the maximum energy of validity
of the Roy equations (1.15 GeV) requires a more precise input at high energies.
In this paper we determine the trajectories and residues of the leading Regge
contributions to the pi pi amplitude (Pomeron, f and rho), using factorization,
phenomenological parametrizations of the pi N and NN total cross sections at
high energy and a set of sum rules which connect the high and low energy
properties of pi pi scattering. We find that nonleading Regge terms are
necessary in order to achieve a smooth transition from the partial waves to the
Regge representation at or below 2 GeV. We obtain thus a Regge representation
consistent both with the experimental information at high energies and the Roy
equations for the partial waves with l =< 4. The uncertainties in our result
for the Regge parameters are sizable but in the solutions of the Roy equations,
these only manifest themselves above K-Kbar threshold.
| [
{
"created": "Wed, 30 Nov 2011 13:49:04 GMT",
"version": "v1"
},
{
"created": "Tue, 7 Aug 2012 08:08:48 GMT",
"version": "v2"
}
] | 2015-06-03 | [
[
"Caprini",
"Irinel",
""
],
[
"Colangelo",
"Gilberto",
""
],
[
"Leutwyler",
"Heinrich",
""
]
] | The theoretical predictions for the subtraction constants lead to a very accurate dispersive representation of the pi pi scattering amplitude below 0.8 GeV. The extension of this representation up to the maximum energy of validity of the Roy equations (1.15 GeV) requires a more precise input at high energies. In this paper we determine the trajectories and residues of the leading Regge contributions to the pi pi amplitude (Pomeron, f and rho), using factorization, phenomenological parametrizations of the pi N and NN total cross sections at high energy and a set of sum rules which connect the high and low energy properties of pi pi scattering. We find that nonleading Regge terms are necessary in order to achieve a smooth transition from the partial waves to the Regge representation at or below 2 GeV. We obtain thus a Regge representation consistent both with the experimental information at high energies and the Roy equations for the partial waves with l =< 4. The uncertainties in our result for the Regge parameters are sizable but in the solutions of the Roy equations, these only manifest themselves above K-Kbar threshold. |
2402.00264 | Hanzhong Zhang | Yu-Xin Xiao, Yayun He, Long-Gang Pang, Hanzhong Zhang and Xin-Nian
Wang | Asymmetric jet shapes with 2D jet tomography | 14 pages, 18 figures | null | null | null | hep-ph | http://creativecommons.org/licenses/by/4.0/ | Two-dimensional (2D) jet tomography is a promising tool to study jet medium
modification in high-energy heavy-ion collisions. It combines gradient
(transverse) and longitudinal jet tomography for selection of events with
localized initial jet production positions. It exploits the transverse
asymmetry and energy loss that depend, respectively, on the transverse gradient
and jet path length inside the quark-gluon plasma (QGP). In this study, we
employ the 2D jet tomography to study medium modification of the jet shape of
$\gamma$-triggered jets within the linear Boltzmann transport (LBT) model for
jet propagation in heavy-ion collisions. Our results show that jets with small
transverse asymmetry ($A_N^{\vec{n}}$) or small $\gamma$-jet asymmetry
($x_{J\gamma}=p_T^{\rm jet}/p_T^\gamma$) exhibit a broader jet shape than those
with larger $A_N^{\vec{n}}$ or $x_{J\gamma}$, since the former are produced at
the center and go through longer path lengths while the later are off-center
and close to the surface of the QGP fireball. In events with finite values of
$A_N^{\vec{n}}$, jet shapes are asymmetric with respect to the event plane.
Hard partons at the core of the jet are deflected away from the denser region
while soft partons from the medium response at large angles flow toward the
denser part of QGP. Future experimental measurements of these asymmetric
features of the jet shape can be used to study the transport properties of jets
and medium responses.
| [
{
"created": "Thu, 1 Feb 2024 01:28:33 GMT",
"version": "v1"
}
] | 2024-02-02 | [
[
"Xiao",
"Yu-Xin",
""
],
[
"He",
"Yayun",
""
],
[
"Pang",
"Long-Gang",
""
],
[
"Zhang",
"Hanzhong",
""
],
[
"Wang",
"Xin-Nian",
""
]
] | Two-dimensional (2D) jet tomography is a promising tool to study jet medium modification in high-energy heavy-ion collisions. It combines gradient (transverse) and longitudinal jet tomography for selection of events with localized initial jet production positions. It exploits the transverse asymmetry and energy loss that depend, respectively, on the transverse gradient and jet path length inside the quark-gluon plasma (QGP). In this study, we employ the 2D jet tomography to study medium modification of the jet shape of $\gamma$-triggered jets within the linear Boltzmann transport (LBT) model for jet propagation in heavy-ion collisions. Our results show that jets with small transverse asymmetry ($A_N^{\vec{n}}$) or small $\gamma$-jet asymmetry ($x_{J\gamma}=p_T^{\rm jet}/p_T^\gamma$) exhibit a broader jet shape than those with larger $A_N^{\vec{n}}$ or $x_{J\gamma}$, since the former are produced at the center and go through longer path lengths while the later are off-center and close to the surface of the QGP fireball. In events with finite values of $A_N^{\vec{n}}$, jet shapes are asymmetric with respect to the event plane. Hard partons at the core of the jet are deflected away from the denser region while soft partons from the medium response at large angles flow toward the denser part of QGP. Future experimental measurements of these asymmetric features of the jet shape can be used to study the transport properties of jets and medium responses. |
1212.5230 | Kyle Wardlow | Kaustubh Agashe, Roberto Franceschini, Doojin Kim, and Kyle Wardlow | Using Energy Peaks to Count Dark Matter Particles in Decays | 25 pages, 5 figures | Phys.Dark Univ. 2 (2013) 72-82 | 10.1016/j.dark.2013.03.003 | UMD-PP-012-027 | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the determination of the symmetry that stabilizes a dark matter (DM)
candidate produced at colliders. Our question is motivated per se, and by
several alternative symmetries that appear in models that provide a DM
particle. To this end, we devise a strategy to determine whether a heavy mother
particle decays into one visible massless particle and one or two DM particles.
The counting of DM particles in these decays is relevant to distinguish the
minimal choice of Z_2, from a Z_3, stabilization symmetry, under which the
heavy particle and the DM are charged and the visible particle is not. Our
method is novel in that it chiefly uses the peak of the energy spectrum of the
visible particle and only secondarily uses the M_T2 endpoint of events in which
the heavy mother particles are pair-produced. We present new theoretical
results concerning the energy distribution of the decay products of a
three-body decay, which are crucial for our method. To demonstrate the
feasibility of our method in investigating the stabilization symmetry, we apply
it in distinguishing the decay of a bottom quark partner into a b quark and one
or two DM particles. The method can be applied generally to distinguish two-
and three-body decays, irrespective of DM.
| [
{
"created": "Thu, 20 Dec 2012 20:35:09 GMT",
"version": "v1"
}
] | 2014-11-18 | [
[
"Agashe",
"Kaustubh",
""
],
[
"Franceschini",
"Roberto",
""
],
[
"Kim",
"Doojin",
""
],
[
"Wardlow",
"Kyle",
""
]
] | We study the determination of the symmetry that stabilizes a dark matter (DM) candidate produced at colliders. Our question is motivated per se, and by several alternative symmetries that appear in models that provide a DM particle. To this end, we devise a strategy to determine whether a heavy mother particle decays into one visible massless particle and one or two DM particles. The counting of DM particles in these decays is relevant to distinguish the minimal choice of Z_2, from a Z_3, stabilization symmetry, under which the heavy particle and the DM are charged and the visible particle is not. Our method is novel in that it chiefly uses the peak of the energy spectrum of the visible particle and only secondarily uses the M_T2 endpoint of events in which the heavy mother particles are pair-produced. We present new theoretical results concerning the energy distribution of the decay products of a three-body decay, which are crucial for our method. To demonstrate the feasibility of our method in investigating the stabilization symmetry, we apply it in distinguishing the decay of a bottom quark partner into a b quark and one or two DM particles. The method can be applied generally to distinguish two- and three-body decays, irrespective of DM. |
hep-ph/0311121 | Hui Dong | Hui Dong, Fang-zhen Li, Zuo-tang Liang (Shandong University) | Energy dependence of the single spin asymmetries in inclusive pion
production processes | submitted to Phys. Rev . D | Phys.Rev. D69 (2004) 017501 | null | null | hep-ph | null | Recent data from E925 Collaboration at Brookheaven National Laboratory show a
significant energy dependence of the single-spin left-right asymmetry in
inclusive hadron production in hadron-hadron collisions. We analyzed the
experimental results and show that the observed energy dependence can be
reproduced naturally in the picture proposed in a previous Letter. We fixed all
the parameters at the Fermilab E704 energy and calculate the asymmetry at the
BNL E925 energy. We compare the results with the data and make predictions for
experiments at even higher energies.
| [
{
"created": "Mon, 10 Nov 2003 12:37:32 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Dong",
"Hui",
"",
"Shandong University"
],
[
"Li",
"Fang-zhen",
"",
"Shandong University"
],
[
"Liang",
"Zuo-tang",
"",
"Shandong University"
]
] | Recent data from E925 Collaboration at Brookheaven National Laboratory show a significant energy dependence of the single-spin left-right asymmetry in inclusive hadron production in hadron-hadron collisions. We analyzed the experimental results and show that the observed energy dependence can be reproduced naturally in the picture proposed in a previous Letter. We fixed all the parameters at the Fermilab E704 energy and calculate the asymmetry at the BNL E925 energy. We compare the results with the data and make predictions for experiments at even higher energies. |
1906.05128 | Boris Kerbikov | B.O. Kerbikov | Transport anomalies near the QCD phase transition at finite density | 3 pages, 1 figure; contribution to the 2019 QCD session of the 54th
Rencontres de Moriond | null | null | null | hep-ph nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We show that at finite density pressure-pressure and current-current
correlators exhibit divergences at $T_c$ owing to the fluctuations of the
diquark field. Specifically, this leads to a significant excess of the soft
photon production rate near $T_c$.
| [
{
"created": "Wed, 12 Jun 2019 13:28:12 GMT",
"version": "v1"
}
] | 2019-06-13 | [
[
"Kerbikov",
"B. O.",
""
]
] | We show that at finite density pressure-pressure and current-current correlators exhibit divergences at $T_c$ owing to the fluctuations of the diquark field. Specifically, this leads to a significant excess of the soft photon production rate near $T_c$. |
1704.04027 | Guey-Lin Lin | Kwang-Chang Lai, Wei-Hao Lai and Guey-Lin Lin | Constraining the Mass Scale of a Lorentz-Violating Hamiltonian with the
Measurement of Astrophysical Neutrino-Flavor Composition | Matches the published version | Phys. Rev. D 96, 115026 (2017) | 10.1103/PhysRevD.96.115026 | null | hep-ph astro-ph.HE hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study Lorentz violation effects on flavor transitions of high energy
astrophysical neutrinos. It is shown that the appearance of Lorentz violating
Hamiltonian can drastically change the flavor transition probabilities of
astrophysical neutrinos. Predictions of Lorentz violation effects on flavor
compositions of astrophysical neutrinos arriving on Earth are compared with
IceCube flavor composition measurement which analyzes astrophysical neutrino
events in the energy range between $25~{\rm TeV}$ and $2.8~{\rm PeV}$. Such a
comparison indicates that the future IceCube-Gen2 will be able to place
stringent constraints on Lorentz violating Hamiltonian in the neutrino sector.
We work out the expected sensitivities by IceCube-Gen2 on dimension-$3$ CPT-odd
and dimension-$4$ CPT-even operators in Lorentz violating Hamiltonian. The
expected sensitivities can improve on the current constraints obtained from
other types of experiments by more than two orders of magnitudes for certain
range of the parameter space.
| [
{
"created": "Thu, 13 Apr 2017 08:19:30 GMT",
"version": "v1"
},
{
"created": "Thu, 11 May 2017 16:28:18 GMT",
"version": "v2"
},
{
"created": "Fri, 12 Jan 2018 09:03:33 GMT",
"version": "v3"
}
] | 2018-01-15 | [
[
"Lai",
"Kwang-Chang",
""
],
[
"Lai",
"Wei-Hao",
""
],
[
"Lin",
"Guey-Lin",
""
]
] | We study Lorentz violation effects on flavor transitions of high energy astrophysical neutrinos. It is shown that the appearance of Lorentz violating Hamiltonian can drastically change the flavor transition probabilities of astrophysical neutrinos. Predictions of Lorentz violation effects on flavor compositions of astrophysical neutrinos arriving on Earth are compared with IceCube flavor composition measurement which analyzes astrophysical neutrino events in the energy range between $25~{\rm TeV}$ and $2.8~{\rm PeV}$. Such a comparison indicates that the future IceCube-Gen2 will be able to place stringent constraints on Lorentz violating Hamiltonian in the neutrino sector. We work out the expected sensitivities by IceCube-Gen2 on dimension-$3$ CPT-odd and dimension-$4$ CPT-even operators in Lorentz violating Hamiltonian. The expected sensitivities can improve on the current constraints obtained from other types of experiments by more than two orders of magnitudes for certain range of the parameter space. |
hep-ph/9407393 | Zhora Jikia | George Jikia | Four Weak Gauge Boson Production at Photon Linear Collider and Heavy
Higgs Signal | LaTeX, 18 pages, 16 figures (one compressed + uuencoded PS file),
preprint IHEP 94-77 | Nucl.Phys. B437 (1995) 520-540 | 10.1016/0550-3213(95)00020-S | null | hep-ph | null | We study the signals and backgrounds for a heavy Higgs boson in the processes
$\gamma\gamma\to WWWW$, $\gamma\gamma\to WWZZ$ at the photon linear collider.
The results are based on the complete tree level SM calculation for these
reactions. We show that the invariant mass spectrum of central $WW$, $ZZ$ pairs
is sensitive to the signal from Higgs boson with a mass up to 1~TeV at a 2~TeV
linear collider for integrated luminosity of 300~fb$^{-1}$. At 1.5~TeV PLC
Higgs boson with a mass up to 700~GeV can be studied. The nonresonant
longitudinal gauge boson scattering ($m_H=\infty$) can be detected in
photon-photon collisions at $e^+e^-$ center-of-mass energy of 3~TeV.
| [
{
"created": "Thu, 28 Jul 1994 17:53:50 GMT",
"version": "v1"
}
] | 2009-10-28 | [
[
"Jikia",
"George",
""
]
] | We study the signals and backgrounds for a heavy Higgs boson in the processes $\gamma\gamma\to WWWW$, $\gamma\gamma\to WWZZ$ at the photon linear collider. The results are based on the complete tree level SM calculation for these reactions. We show that the invariant mass spectrum of central $WW$, $ZZ$ pairs is sensitive to the signal from Higgs boson with a mass up to 1~TeV at a 2~TeV linear collider for integrated luminosity of 300~fb$^{-1}$. At 1.5~TeV PLC Higgs boson with a mass up to 700~GeV can be studied. The nonresonant longitudinal gauge boson scattering ($m_H=\infty$) can be detected in photon-photon collisions at $e^+e^-$ center-of-mass energy of 3~TeV. |
0809.4383 | Jordan Skittrall | Jordan P. Skittrall | Production of a Z boson and a photon via a Randall-Sundrum-type graviton
at the Large Hadron Collider | 5 pages, 1 figure. v2: minor corrections | Eur.Phys.J.C60:291-295,2009 | 10.1140/epjc/s10052-009-0920-7 | DAMTP-2008-87 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In extra dimensional models with Kaluza-Klein graviton states that are well
separated in mass, such states may be observed as resonances in collider
experiments. We extend previous works on such scenarios by considering the
one-loop resonant production of a Z boson in association with a photon. We find
the production rate to be negligible in conservative scenarios, and
sufficiently small for observation to be very difficult even for reasonable
luminosity in less conservative scenarios.
| [
{
"created": "Thu, 25 Sep 2008 11:40:02 GMT",
"version": "v1"
},
{
"created": "Thu, 12 Feb 2009 14:10:00 GMT",
"version": "v2"
}
] | 2010-04-15 | [
[
"Skittrall",
"Jordan P.",
""
]
] | In extra dimensional models with Kaluza-Klein graviton states that are well separated in mass, such states may be observed as resonances in collider experiments. We extend previous works on such scenarios by considering the one-loop resonant production of a Z boson in association with a photon. We find the production rate to be negligible in conservative scenarios, and sufficiently small for observation to be very difficult even for reasonable luminosity in less conservative scenarios. |
hep-ph/0110063 | Karol Kolodziej | Karol Kolodziej | Top quark pair production and decay into 6 fermions at linear colliders | 12 pages, 3 figures, references added, a comparison to existing
results improved, accepted for publication in Eur.Phys.J.C | Eur.Phys.J.C23:471-477,2002 | 10.1007/s100520200890 | null | hep-ph | null | The production of a t\bar{t}-pair and its decay into a 6 fermion final state
of different flavours in e+e- annihilation at centre of mass energies typical
for linear colliders is analyzed in the framework of the Standard Model. The
results of calculation based on exact matrix elements at the tree level and
full 6 particle phase space are compared with a few different approximations.
It is shown that the effects related to off-shellness of the t\bar{t}-pair and
background contributions are sizable both in the continuum and at the
threshold.
| [
{
"created": "Thu, 4 Oct 2001 13:26:42 GMT",
"version": "v1"
},
{
"created": "Thu, 3 Jan 2002 13:07:07 GMT",
"version": "v2"
}
] | 2011-09-13 | [
[
"Kolodziej",
"Karol",
""
]
] | The production of a t\bar{t}-pair and its decay into a 6 fermion final state of different flavours in e+e- annihilation at centre of mass energies typical for linear colliders is analyzed in the framework of the Standard Model. The results of calculation based on exact matrix elements at the tree level and full 6 particle phase space are compared with a few different approximations. It is shown that the effects related to off-shellness of the t\bar{t}-pair and background contributions are sizable both in the continuum and at the threshold. |
hep-ph/9606279 | Marco Fabbrichesi | M. Fabbrichesi and E.I. Lashin | The Bosonization of the Electroweak Penguin Operators | 9 pages, uuencoded Latex + eps files | Phys.Lett.B387:609-613,1996 | 10.1016/0370-2693(96)01082-9 | SISSA 74/96/EP | hep-ph | null | We give the complete $O(p^2)$ bosonization of the electroweak Penguin
operators $Q_{7,8}$ and compare the result with that of the gluon Penguin
operators $Q_{5,6}$. We find that, in addition to the usual (constant and
current-current) parts, there are three new terms not discussed previously in
the literature. Two of these are present in the factorization approximation and
should be included in the standard definition of the $B_{7,8}$-factors. The
impact of these corrections on the direct $CP$-violating parameter $\varepsilon
'/\varepsilon$ is briefly discussed.
| [
{
"created": "Sun, 9 Jun 1996 12:00:53 GMT",
"version": "v1"
}
] | 2014-11-17 | [
[
"Fabbrichesi",
"M.",
""
],
[
"Lashin",
"E. I.",
""
]
] | We give the complete $O(p^2)$ bosonization of the electroweak Penguin operators $Q_{7,8}$ and compare the result with that of the gluon Penguin operators $Q_{5,6}$. We find that, in addition to the usual (constant and current-current) parts, there are three new terms not discussed previously in the literature. Two of these are present in the factorization approximation and should be included in the standard definition of the $B_{7,8}$-factors. The impact of these corrections on the direct $CP$-violating parameter $\varepsilon '/\varepsilon$ is briefly discussed. |
hep-ph/0311178 | Abhijit Majumder | A. Majumder, A. Bourque and C. Gale | Broken symmetries and dilepton production from gluon fusion in a quark
gluon plasma | 32 pages, 13 figures, Revtex4, minor changes, version accepted for
publication in Phys. Rev. C | Phys.Rev.C69:064901,2004 | 10.1103/PhysRevC.69.064901 | LBNL-52689 | hep-ph nucl-th | null | The observational consequences of certain broken symmetries in a thermalised
quark gluon plasma are elucidated. The signature under study is the spectrum of
dileptons radiating from the plasma, through gluon fusion. Being a pure medium
effect, this channel is non-vanishing only in plasmas with explicitly broken
charge conjugation invariance. The emission rates are also sensitive to
rotational invariance through the constraints imposed by Yang's theorem. This
theorem is interpreted in the medium via the destructive interference between
various multiple scattering diagrams obtained in the spectator picture. Rates
from the fusion process are presented in comparison with those from the Born
term.
| [
{
"created": "Thu, 13 Nov 2003 20:14:06 GMT",
"version": "v1"
},
{
"created": "Thu, 25 Mar 2004 22:18:48 GMT",
"version": "v2"
}
] | 2010-01-15 | [
[
"Majumder",
"A.",
""
],
[
"Bourque",
"A.",
""
],
[
"Gale",
"C.",
""
]
] | The observational consequences of certain broken symmetries in a thermalised quark gluon plasma are elucidated. The signature under study is the spectrum of dileptons radiating from the plasma, through gluon fusion. Being a pure medium effect, this channel is non-vanishing only in plasmas with explicitly broken charge conjugation invariance. The emission rates are also sensitive to rotational invariance through the constraints imposed by Yang's theorem. This theorem is interpreted in the medium via the destructive interference between various multiple scattering diagrams obtained in the spectator picture. Rates from the fusion process are presented in comparison with those from the Born term. |
hep-ph/9612280 | John Womersley | John Womersley (Fermilab) | Discovering Technicolor at Hadron Colliders | 4 pages, 6 figures, LaTeX; to appear in the Proceedings of the 1996
DPF/DPB Summer Study (Snowmass 1996) | ECONFC960625:NEW175,1996 | null | FERMILAB-Conf-96/431 | hep-ph hep-ex | null | Strategies are presented for discovering light, color-singlet technipions
(pi_T) produced in association with a vector boson through s-channel technirho
production, at the Tevatron and LHC. Signal and W+jets background were
simulated including detector effects. Tagging of b-quarks from the pi_T -> bb
decay is found to be important to reduce the W+jets background. Kinematic
properties of signal and background events are significantly different and
simple cuts can be used to further improve the signal to background ratio.
| [
{
"created": "Fri, 6 Dec 1996 21:40:41 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Womersley",
"John",
"",
"Fermilab"
]
] | Strategies are presented for discovering light, color-singlet technipions (pi_T) produced in association with a vector boson through s-channel technirho production, at the Tevatron and LHC. Signal and W+jets background were simulated including detector effects. Tagging of b-quarks from the pi_T -> bb decay is found to be important to reduce the W+jets background. Kinematic properties of signal and background events are significantly different and simple cuts can be used to further improve the signal to background ratio. |
hep-ph/0406156 | Massimiliano Grazzini | M. Grazzini | The transverse momentum distribution of the Higgs boson at the LHC | 6 pages, 3 figures, presented at the XXXIXth Rencontres de Moriond,
QCD and Hadronic interactions, La Thuile, Italy | null | null | CERN-PH-TH/2004-107 | hep-ph | null | We present perturbative predictions for the transverse momentum (q_T)
distribution of the Higgs boson at the LHC. At small q_T the
logarithmically-enhanced terms are resummed to all orders up to
next-to-next-to-leading logarithmic accuracy. The resummed component is
consistently matched to the next-to-leading order calculation valid at large
q_T. The results, which implement the most advanced perturbative information
that is available at present for this observable, show a good stability with
respect to perturbative QCD uncertainties.
| [
{
"created": "Tue, 15 Jun 2004 09:11:56 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Grazzini",
"M.",
""
]
] | We present perturbative predictions for the transverse momentum (q_T) distribution of the Higgs boson at the LHC. At small q_T the logarithmically-enhanced terms are resummed to all orders up to next-to-next-to-leading logarithmic accuracy. The resummed component is consistently matched to the next-to-leading order calculation valid at large q_T. The results, which implement the most advanced perturbative information that is available at present for this observable, show a good stability with respect to perturbative QCD uncertainties. |
hep-ph/0103142 | Ted Barnes | T. Barnes | QCD Spectroscopy at Gsi: Exotica and Charmonia | 14 pages, 5 figures. Hirschegg'01 Workshop on the Structure of
Hadrons, Hirschegg, Austria, 14-20 Jan 2001 | null | null | null | hep-ph | null | In this talk I give a short summary of the basics of conventional and exotic
meson spectroscopy, and consider in particular those issues in the charmonium
and charmonium hybrid sectors which can be addressed by a future antiproton
facility at GSI.
| [
{
"created": "Tue, 13 Mar 2001 19:53:54 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Barnes",
"T.",
""
]
] | In this talk I give a short summary of the basics of conventional and exotic meson spectroscopy, and consider in particular those issues in the charmonium and charmonium hybrid sectors which can be addressed by a future antiproton facility at GSI. |
hep-ph/0409075 | Ernest Ma | Ernest Ma (UC Riverside) | Non-Abelian Discrete Family Symmetries of Leptons and Quarks | 16 pages, no figure, talk at SI2004, Fuji-Yoshida, Japan | null | null | UCRHEP-T379 (Sep 2004) | hep-ph | null | Recent progress is reviewed regarding the application of the non-Abelian
symmetries S_3, D_4, and A_4 to the understanding of family structure in
leptons and quarks.
| [
{
"created": "Tue, 7 Sep 2004 16:11:08 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Ma",
"Ernest",
"",
"UC Riverside"
]
] | Recent progress is reviewed regarding the application of the non-Abelian symmetries S_3, D_4, and A_4 to the understanding of family structure in leptons and quarks. |
0711.3349 | Toshitaka Tatsumi | T. Tatsumi | Ferromagnetism in QCD phase diagram | 9pages,1 figure, Proc. of EXOCT 2007 | null | 10.1142/9789812797049_0041 | null | hep-ph | null | A possibility and properties of spontaneous magnetization in quark matter are
investigated. Magnetic susceptibility is evaluated within Fermi liquid theory,
taking into account of the screening effect of gluons. Spin wave in the
polarized quark matter, as the Nambu-Goldstone mode, is formulated by way of
the coherent-state path integral.
| [
{
"created": "Wed, 21 Nov 2007 11:36:37 GMT",
"version": "v1"
}
] | 2017-08-23 | [
[
"Tatsumi",
"T.",
""
]
] | A possibility and properties of spontaneous magnetization in quark matter are investigated. Magnetic susceptibility is evaluated within Fermi liquid theory, taking into account of the screening effect of gluons. Spin wave in the polarized quark matter, as the Nambu-Goldstone mode, is formulated by way of the coherent-state path integral. |
0710.5111 | Gluza Janusz Dr | S. Actis, M. Czakon, J. Gluza, T. Riemann | Fermionic NNLO contributions to Bhabha scattering | To be published in Acta Physica Polonica, based on the talk given at
31st International Conference of Theoretical Physics: Matter to the Deepest:
Recent Development in Physics of Fundamental Interactions, Ustron, Katowice,
Poland, 5-11 Sep 2007 | Acta Phys.Polon.B38:3517-3528,2007 | null | DESY 07-183, SFB/CPP-07-70 | hep-ph | null | We derive the two-loop corrections to Bhabha scattering from heavy fermions
using dispersion relations. The double-box contributions are expressed by three
kernel functions. Convoluting the perturbative kernels with fermionic threshold
functions or with hadronic data allows to determine numerical results for small
electron mass m_e, combined with arbitrary values of the fermion mass m_f in
the loop, $m_e^2<<s,t,m_f^2$, or with hadronic insertions. We present numerical
results for m_f = m_{\mu}, m_{\tau}, m_{top} at typical small- and large-angle
kinematics ranging from 1 GeV to 500 GeV.
| [
{
"created": "Fri, 26 Oct 2007 14:57:58 GMT",
"version": "v1"
},
{
"created": "Sat, 27 Oct 2007 09:53:11 GMT",
"version": "v2"
}
] | 2008-12-30 | [
[
"Actis",
"S.",
""
],
[
"Czakon",
"M.",
""
],
[
"Gluza",
"J.",
""
],
[
"Riemann",
"T.",
""
]
] | We derive the two-loop corrections to Bhabha scattering from heavy fermions using dispersion relations. The double-box contributions are expressed by three kernel functions. Convoluting the perturbative kernels with fermionic threshold functions or with hadronic data allows to determine numerical results for small electron mass m_e, combined with arbitrary values of the fermion mass m_f in the loop, $m_e^2<<s,t,m_f^2$, or with hadronic insertions. We present numerical results for m_f = m_{\mu}, m_{\tau}, m_{top} at typical small- and large-angle kinematics ranging from 1 GeV to 500 GeV. |
1201.6603 | Katherine Richardson | Rouzbeh Allahverdi, Katherine Richardson | Distinguishing among dark matter annihilation channels with neutrino
telescopes | 12 pages, 12 figures. v2 matches the published version, with revised
figures and added references for improved clarity; results unchanged | Phys. Rev. D 85, 113012 (2012) | 10.1103/PhysRevD.85.113012 | null | hep-ph astro-ph.CO hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We investigate the prospects for distinguishing dark matter annihilation
channels using the neutrino flux from gravitationally captured dark matter
particles annihilating inside the sun. We show that, even with experimental
error in energy reconstruction taken into account, the spectrum of contained
muon tracks may be used to discriminate neutrino final states from the gauge
boson/charged lepton final states and to determine their corresponding
branching ratios. We also discuss the effect of $\nu_\tau$ regeneration inside
the sun as a novel method to distinguish the flavor of final state neutrinos.
This effect as evidenced in the muon spectrum becomes important for dark matter
masses above 300 GeV. Distinguishing primary neutrinos and their flavor may be
achieved using multi-year data from a detector with the same capability and
effective volume as the IceCube/DeepCore array.
| [
{
"created": "Tue, 31 Jan 2012 16:36:18 GMT",
"version": "v1"
},
{
"created": "Thu, 5 Jul 2012 15:21:19 GMT",
"version": "v2"
}
] | 2013-05-30 | [
[
"Allahverdi",
"Rouzbeh",
""
],
[
"Richardson",
"Katherine",
""
]
] | We investigate the prospects for distinguishing dark matter annihilation channels using the neutrino flux from gravitationally captured dark matter particles annihilating inside the sun. We show that, even with experimental error in energy reconstruction taken into account, the spectrum of contained muon tracks may be used to discriminate neutrino final states from the gauge boson/charged lepton final states and to determine their corresponding branching ratios. We also discuss the effect of $\nu_\tau$ regeneration inside the sun as a novel method to distinguish the flavor of final state neutrinos. This effect as evidenced in the muon spectrum becomes important for dark matter masses above 300 GeV. Distinguishing primary neutrinos and their flavor may be achieved using multi-year data from a detector with the same capability and effective volume as the IceCube/DeepCore array. |
0801.0236 | Orhan Cakir | O. Cakir, I. Turk Cakir, H. Duran Yildiz, R. Mehdiyev | Single Production of Fourth Family Quarks at the LHC | 16 pages, 7 figures, 6 tables | Eur.Phys.J.C56:537-543,2008 | 10.1140/epjc/s10052-008-0685-4 | null | hep-ph | null | We study the single production of the fourth family quarks through the
process pp--> Q'jX at the Large Hadron Collider (LHC). We have calculated the
decay widths and branching ratios of the fourth family quarks (b' and t') in
the mass range 300-800 GeV. The cross sections of signal and background
processes have been calculated in a Monte Carlo framework. It is shown that the
LHC can discover single t' and b' quarks if the CKM matrix elements
|V_{t'q}|,|V_{qb'}|>=0.01.
| [
{
"created": "Wed, 2 Jan 2008 09:33:08 GMT",
"version": "v1"
},
{
"created": "Mon, 11 Feb 2008 19:38:26 GMT",
"version": "v2"
}
] | 2008-11-26 | [
[
"Cakir",
"O.",
""
],
[
"Cakir",
"I. Turk",
""
],
[
"Yildiz",
"H. Duran",
""
],
[
"Mehdiyev",
"R.",
""
]
] | We study the single production of the fourth family quarks through the process pp--> Q'jX at the Large Hadron Collider (LHC). We have calculated the decay widths and branching ratios of the fourth family quarks (b' and t') in the mass range 300-800 GeV. The cross sections of signal and background processes have been calculated in a Monte Carlo framework. It is shown that the LHC can discover single t' and b' quarks if the CKM matrix elements |V_{t'q}|,|V_{qb'}|>=0.01. |
hep-ph/9709214 | Vladimir N. Baier | V. N. Baier and V. M. Katkov | The theory of the Landau, Pomeranchuk, Migdal effect | 36 pages, LaTeX, 3 eps figures | Phys. Rev. D 57, 3146 (1998) | 10.1103/PhysRevD.57.3146 | Budker INP 97-70 | hep-ph | null | Bremsstrahlung of photons from highly relativistic electrons is investigated.
The cross section of the processes, which is suppressed due to a multiple
scattering of an emitting electron in dense media (LPM effect) and due to
photon interaction with electrons of a medium, is calculated with an accuracy
up to "next to leading logarithm" and with the Coulomb corrections taken into
account. Making allowances for a multiple scattering and a polarization of a
medium an analysis of radiation on a target boundary is carried out. The method
of consideration of radiation in a thin target under influence of the LPM
effect is developed. Interrelation with the recent experiment is discussed.
| [
{
"created": "Tue, 2 Sep 1997 07:58:40 GMT",
"version": "v1"
}
] | 2016-08-25 | [
[
"Baier",
"V. N.",
""
],
[
"Katkov",
"V. M.",
""
]
] | Bremsstrahlung of photons from highly relativistic electrons is investigated. The cross section of the processes, which is suppressed due to a multiple scattering of an emitting electron in dense media (LPM effect) and due to photon interaction with electrons of a medium, is calculated with an accuracy up to "next to leading logarithm" and with the Coulomb corrections taken into account. Making allowances for a multiple scattering and a polarization of a medium an analysis of radiation on a target boundary is carried out. The method of consideration of radiation in a thin target under influence of the LPM effect is developed. Interrelation with the recent experiment is discussed. |
1709.09766 | Masashi Wakamatsu | M. Wakamatsu, Y. Kitadono, and P.-M. Zhang | The issue of gauge choice in the Landau problem and the physics of
canonical and mechanical orbital angular momenta | The version to appear in Annals of Physics. The discussion in sect.3
has been significantly modified so as to make clear the physical meaning of
the path choice in the DeWitt formalism. One appendix is added | null | 10.1016/j.aop.2018.03.019 | KEK-TH-2002 and J-PARK-TH-0108 | hep-ph quant-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | One intriguing issue in the nucleon spin decomposition problem is the
existence of two types of decompositions, which are representably characterized
by two different orbital angular momenta (OAMs) of quarks. The one is the
manifestly gauge-invariant mechanical OAM, while the other is the so-called
gauge-invariant canonical (g.i.c.) OAM, the concept of which was introduced by
Chen et al. To get a deep insight into the difference of these two
decompositions, it is therefore vitally important to understand the the
physical meanings of the above two OAMs correctly. Also to be clarified is the
implication of the gauge symmetry that is immanent in the concept of g.i.c.
OAM. We find that the famous Landau problem provides us with an ideal tool to
answer these questions owing to its analytically solvable nature. After
deriving a complete relation between the standard eigen-functions of the Landau
Hamiltonian in the Landau gauge and in the symmetric gauge, we try to unravel
the physics of the the canonical OAM and the mechanical OAM, by paying special
attention to their gauge-dependence. We also argue that, different from the
mechanical OAM of the electron, the canonical OAM or its gauge-invariant
version would not correspond to any direct observables at least in the Landau
problem. Also briefly discussed is the uniqueness or non-uniqueness problem of
the nucleon spin decomposition, which arises from the arbitrariness in the
definition of the so-called physical component of the gauge field.
| [
{
"created": "Thu, 28 Sep 2017 00:14:11 GMT",
"version": "v1"
},
{
"created": "Mon, 2 Apr 2018 10:24:27 GMT",
"version": "v2"
}
] | 2018-05-09 | [
[
"Wakamatsu",
"M.",
""
],
[
"Kitadono",
"Y.",
""
],
[
"Zhang",
"P. -M.",
""
]
] | One intriguing issue in the nucleon spin decomposition problem is the existence of two types of decompositions, which are representably characterized by two different orbital angular momenta (OAMs) of quarks. The one is the manifestly gauge-invariant mechanical OAM, while the other is the so-called gauge-invariant canonical (g.i.c.) OAM, the concept of which was introduced by Chen et al. To get a deep insight into the difference of these two decompositions, it is therefore vitally important to understand the the physical meanings of the above two OAMs correctly. Also to be clarified is the implication of the gauge symmetry that is immanent in the concept of g.i.c. OAM. We find that the famous Landau problem provides us with an ideal tool to answer these questions owing to its analytically solvable nature. After deriving a complete relation between the standard eigen-functions of the Landau Hamiltonian in the Landau gauge and in the symmetric gauge, we try to unravel the physics of the the canonical OAM and the mechanical OAM, by paying special attention to their gauge-dependence. We also argue that, different from the mechanical OAM of the electron, the canonical OAM or its gauge-invariant version would not correspond to any direct observables at least in the Landau problem. Also briefly discussed is the uniqueness or non-uniqueness problem of the nucleon spin decomposition, which arises from the arbitrariness in the definition of the so-called physical component of the gauge field. |
hep-ph/0112256 | Arwed Schiller | C. Carimalo, A. Schiller, V.G. Serbo | New method for calculating helicity amplitudes of jet--like QED
processes for high--energy colliders I. Bremsstrahlung processes | 17 pages, LATEX (svjour style files included) | Eur.Phys.J.C23:633-649,2002 | 10.1007/s100520200905 | LU 2001/027, LPNHE 2001-14 | hep-ph | null | Inelastic QED processes, the cross sections of which do not drop with
increasing energy, play an important role at high-energy colliders. Such
reactions have the form of two-jet processes with the exchange of a virtual
photon in the t-channel. We consider them in the region of small scattering
angles $m/E \lesssim \theta \ll 1$, which yields the dominant contribution to
their total cross sections. A new effective method is presented and applied to
QED processes with emission of real photons to calculate the helicity
amplitudes of these processes. Its basic idea is similar to the well-known
equivalent-lepton method. Compact analytical expressions for those amplitudes
up to $e^8$ are derived omitting only terms of the order of $m^2/E^2,
\theta^2$, $\theta m/E$ and higher order. The helicity amplitudes are presented
in a compact form in which large compensating terms are already cancelled. Some
common properties for all jet-like processes are found and we discuss their
origin.
| [
{
"created": "Wed, 19 Dec 2001 17:50:37 GMT",
"version": "v1"
}
] | 2011-09-13 | [
[
"Carimalo",
"C.",
""
],
[
"Schiller",
"A.",
""
],
[
"Serbo",
"V. G.",
""
]
] | Inelastic QED processes, the cross sections of which do not drop with increasing energy, play an important role at high-energy colliders. Such reactions have the form of two-jet processes with the exchange of a virtual photon in the t-channel. We consider them in the region of small scattering angles $m/E \lesssim \theta \ll 1$, which yields the dominant contribution to their total cross sections. A new effective method is presented and applied to QED processes with emission of real photons to calculate the helicity amplitudes of these processes. Its basic idea is similar to the well-known equivalent-lepton method. Compact analytical expressions for those amplitudes up to $e^8$ are derived omitting only terms of the order of $m^2/E^2, \theta^2$, $\theta m/E$ and higher order. The helicity amplitudes are presented in a compact form in which large compensating terms are already cancelled. Some common properties for all jet-like processes are found and we discuss their origin. |
hep-ph/0606311 | Danny Marfatia | V. Barger, Patrick Huber, Danny Marfatia | Ultra high energy neutrino-nucleon cross section from cosmic ray
experiments and neutrino telescopes | 20 pages, 6 figures, 2 tables | Phys.Lett.B642:333-341,2006 | 10.1016/j.physletb.2006.09.067 | null | hep-ph astro-ph hep-ex | null | We deduce the cosmogenic neutrino flux by jointly analysing ultra high energy
cosmic ray data from HiRes-I and II, AGASA and the Pierre Auger Observatory. We
make two determinations of the neutrino flux by using a model-dependent method
and a model-independent method. The former is well-known, and involves the use
of a power-law injection spectrum. The latter is a regularized unfolding
procedure. We then use neutrino flux bounds obtained by the RICE experiment to
constrain the neutrino-nucleon inelastic cross section at energies inaccessible
at colliders. The cross section bounds obtained using the cosmogenic fluxes
derived by unfolding are the most model-independent bounds to date.
| [
{
"created": "Thu, 29 Jun 2006 22:36:30 GMT",
"version": "v1"
}
] | 2009-09-15 | [
[
"Barger",
"V.",
""
],
[
"Huber",
"Patrick",
""
],
[
"Marfatia",
"Danny",
""
]
] | We deduce the cosmogenic neutrino flux by jointly analysing ultra high energy cosmic ray data from HiRes-I and II, AGASA and the Pierre Auger Observatory. We make two determinations of the neutrino flux by using a model-dependent method and a model-independent method. The former is well-known, and involves the use of a power-law injection spectrum. The latter is a regularized unfolding procedure. We then use neutrino flux bounds obtained by the RICE experiment to constrain the neutrino-nucleon inelastic cross section at energies inaccessible at colliders. The cross section bounds obtained using the cosmogenic fluxes derived by unfolding are the most model-independent bounds to date. |
hep-ph/0302067 | Dmitri Kuzmenko | D.S. Kuzmenko (ITEP, Moscow) | Static potential in baryon | 7 pages, 4 figures, talk at the NPD-2002 Conference, December 2-6,
ITEP, Moscow | Phys.Atom.Nucl. 67 (2004) 548-552; Yad.Fiz. 67 (2004) 566-570 | 10.1134/1.1690063 | null | hep-ph hep-lat nucl-th | null | The baryon static potential is calculated in the framework of field
correlator method and is shown to match the recent lattice results. The effects
of the nonzero value of the gluon correlation length are emphasized.
| [
{
"created": "Mon, 10 Feb 2003 20:42:05 GMT",
"version": "v1"
},
{
"created": "Mon, 10 Feb 2003 22:07:31 GMT",
"version": "v2"
}
] | 2009-11-10 | [
[
"Kuzmenko",
"D. S.",
"",
"ITEP, Moscow"
]
] | The baryon static potential is calculated in the framework of field correlator method and is shown to match the recent lattice results. The effects of the nonzero value of the gluon correlation length are emphasized. |
hep-ph/0102077 | Guohuai Zhu | Dongsheng Du, Deshan Yang, Guohuai Zhu | Infrared Divergence and Twist-3 Distribution Amplitudes in QCD
Factorization For $B \to PP$ | 12 pages, 3 figures, A revised version to appear in Phys. Lett. B | Phys.Lett. B509 (2001) 263-272 | 10.1016/S0370-2693(01)00398-7 | null | hep-ph | null | Since b quark mass is not asymptotically large, chirally enhanced corrections
which arise from twist-3 wave functions may be important in B decays. We thus
evaluate the hadronic matrix elements with the final light pseudoscalar mesons
described by leading twist and twist-3 distribution amplitudes. We find that
chirally enhanced corrections can be included consistently in the framework of
QCD factorization only if the twist-3 distribution amplitudes are symmetric. We
then give explicit expressions of $a_i^p$ for $B \to \pi\pi$ at the
next-to-leading order of $\alpha_s$ including chirally enhanced corrections. We
also briefly discuss the divergence appeared in the hard spectator
contributions.
| [
{
"created": "Wed, 7 Feb 2001 08:59:26 GMT",
"version": "v1"
},
{
"created": "Sun, 18 Feb 2001 11:56:53 GMT",
"version": "v2"
},
{
"created": "Sun, 25 Mar 2001 02:19:54 GMT",
"version": "v3"
}
] | 2009-11-07 | [
[
"Du",
"Dongsheng",
""
],
[
"Yang",
"Deshan",
""
],
[
"Zhu",
"Guohuai",
""
]
] | Since b quark mass is not asymptotically large, chirally enhanced corrections which arise from twist-3 wave functions may be important in B decays. We thus evaluate the hadronic matrix elements with the final light pseudoscalar mesons described by leading twist and twist-3 distribution amplitudes. We find that chirally enhanced corrections can be included consistently in the framework of QCD factorization only if the twist-3 distribution amplitudes are symmetric. We then give explicit expressions of $a_i^p$ for $B \to \pi\pi$ at the next-to-leading order of $\alpha_s$ including chirally enhanced corrections. We also briefly discuss the divergence appeared in the hard spectator contributions. |
2205.03417 | William East | William E. East | Vortex String Formation in Black Hole Superradiance of a Dark Photon
with the Higgs Mechanism | 8 pages, 5 figures; revised to match PRL accepted version, including
some improved figures | Phys. Rev. Lett. 129, 141103 (2022) | 10.1103/PhysRevLett.129.141103 | null | hep-ph gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Black hole superradiance, which only relies on gravitational interactions,
can provide a powerful probe of the existence of ultralight bosons that are
weakly coupled to ordinary matter. However, as a boson cloud grows through
superradiance, nonlinear effects from interactions with itself or other fields
may become important. As a representative example of this, we use nonlinear
evolutions to study black hole superradiance of a vector boson that attains a
mass, via a coupling to a complex scalar, through the Higgs mechanism. For the
cases considered, we find that the superradiant instability can lead to a
transient period where the scalar field reaches its symmetry restoration value,
leading to the formation of closed vortex strings, the temporary disruption of
the exponential growth of the cloud, and an explosive outburst of energy. After
the cloud loses sufficient mass, the superradiant growth resumes, and the cycle
repeats. Thus, the black hole will be spun down but, potentially, at a much
lower rate compared to when nonlinear effects are unimportant, and with the
liberated energy going primarily into bosonic radiation instead of
gravitational waves.
| [
{
"created": "Fri, 6 May 2022 18:00:00 GMT",
"version": "v1"
},
{
"created": "Thu, 1 Sep 2022 20:44:58 GMT",
"version": "v2"
}
] | 2022-10-04 | [
[
"East",
"William E.",
""
]
] | Black hole superradiance, which only relies on gravitational interactions, can provide a powerful probe of the existence of ultralight bosons that are weakly coupled to ordinary matter. However, as a boson cloud grows through superradiance, nonlinear effects from interactions with itself or other fields may become important. As a representative example of this, we use nonlinear evolutions to study black hole superradiance of a vector boson that attains a mass, via a coupling to a complex scalar, through the Higgs mechanism. For the cases considered, we find that the superradiant instability can lead to a transient period where the scalar field reaches its symmetry restoration value, leading to the formation of closed vortex strings, the temporary disruption of the exponential growth of the cloud, and an explosive outburst of energy. After the cloud loses sufficient mass, the superradiant growth resumes, and the cycle repeats. Thus, the black hole will be spun down but, potentially, at a much lower rate compared to when nonlinear effects are unimportant, and with the liberated energy going primarily into bosonic radiation instead of gravitational waves. |
hep-ph/0005123 | Edward W. Kolb | Gian Francesco Giudice, Edward W. Kolb, Antonio Riotto | Largest temperature of the radiation era and its cosmological
implications | 27 pages. LaTeX (using revtex) with 10 eps figures embedded using
epsf Revised version, with changes mostly in the section on the relic
neutrino density in low-reheat models | Phys.Rev. D64 (2001) 023508 | 10.1103/PhysRevD.64.023508 | SNS-PH/00-05, FNAL-Pub-00/075-A, CERN-TH/2000-107 | hep-ph astro-ph | null | The thermal history of the universe before the epoch of nucleosynthesis is
unknown. The maximum temperature in the radiation-dominated era, which we will
refer to as the reheat temperature, may have been as low as 0.7 MeV. In this
paper we show that a low reheat temperature has important implications for many
topics in cosmology. We show that weakly interacting massive particles (WIMPs)
may be produced even if the reheat temperature is much smaller than the
freeze-out temperature of the WIMP, and that the dependence of the present
abundance on the mass and the annihilation cross section of the WIMP differs
drastically from familiar results. We revisit predictions of the relic
abundance and resulting model constraints of supersymmetric dark matter,
axions, massive neutrinos, and other dark matter candidates, nucleosynthesis
constraints on decaying particles, and leptogenesis by decay of superheavy
particles. We find that the allowed parameter space of supersymmetric models is
altered, removing the usual bounds on the mass spectrum; the cosmological bound
on massive neutrinos is drastically changed, ruling out Dirac (Majorana)
neutrino masses $m_\nu$ only in the range 33 keV $\simlt m_\nu\simlt$ 6 (5)
MeV, which is significantly smaller from the the standard disallowed range 94
eV $\simlt m_\nu\simlt$ 2 GeV (this implies that massive neutrinos may still
play the role of either warm or cold dark matter); the cosmological upper bound
on the Peccei-Quinn scale may be significantly increased to $ 10^{16}$GeV from
the usually cited limit of about $10^{12}$GeV; and that efficient
out-of-equilibrium GUT baryogenesis and/or leptogenesis can take place even if
the reheat temperature is much smaller than the mass of the decaying superheavy
particle.
| [
{
"created": "Fri, 12 May 2000 18:51:26 GMT",
"version": "v1"
},
{
"created": "Fri, 22 Dec 2000 19:12:29 GMT",
"version": "v2"
}
] | 2009-10-31 | [
[
"Giudice",
"Gian Francesco",
""
],
[
"Kolb",
"Edward W.",
""
],
[
"Riotto",
"Antonio",
""
]
] | The thermal history of the universe before the epoch of nucleosynthesis is unknown. The maximum temperature in the radiation-dominated era, which we will refer to as the reheat temperature, may have been as low as 0.7 MeV. In this paper we show that a low reheat temperature has important implications for many topics in cosmology. We show that weakly interacting massive particles (WIMPs) may be produced even if the reheat temperature is much smaller than the freeze-out temperature of the WIMP, and that the dependence of the present abundance on the mass and the annihilation cross section of the WIMP differs drastically from familiar results. We revisit predictions of the relic abundance and resulting model constraints of supersymmetric dark matter, axions, massive neutrinos, and other dark matter candidates, nucleosynthesis constraints on decaying particles, and leptogenesis by decay of superheavy particles. We find that the allowed parameter space of supersymmetric models is altered, removing the usual bounds on the mass spectrum; the cosmological bound on massive neutrinos is drastically changed, ruling out Dirac (Majorana) neutrino masses $m_\nu$ only in the range 33 keV $\simlt m_\nu\simlt$ 6 (5) MeV, which is significantly smaller from the the standard disallowed range 94 eV $\simlt m_\nu\simlt$ 2 GeV (this implies that massive neutrinos may still play the role of either warm or cold dark matter); the cosmological upper bound on the Peccei-Quinn scale may be significantly increased to $ 10^{16}$GeV from the usually cited limit of about $10^{12}$GeV; and that efficient out-of-equilibrium GUT baryogenesis and/or leptogenesis can take place even if the reheat temperature is much smaller than the mass of the decaying superheavy particle. |
hep-ph/9907366 | Michael Klasen | M. Klasen (Argonne) | Photon Structure and the Production of Jets, Hadrons, and Prompt Photons | 12 pages, 8 figures, to appear in the Proceedings of the Ringberg
Workshop on ``New Trends in HERA Physics 1999'' | null | null | ANL-HEP-CP-99-73 | hep-ph | null | We give a pedagogical introduction to hard photoproduction processes at HERA,
including the production of jets, hadrons, and prompt photons. Recent
theoretical developments in the three areas are reviewed.
| [
{
"created": "Thu, 15 Jul 1999 00:45:31 GMT",
"version": "v1"
},
{
"created": "Fri, 16 Jul 1999 22:21:13 GMT",
"version": "v2"
}
] | 2007-05-23 | [
[
"Klasen",
"M.",
"",
"Argonne"
]
] | We give a pedagogical introduction to hard photoproduction processes at HERA, including the production of jets, hadrons, and prompt photons. Recent theoretical developments in the three areas are reviewed. |
2106.05013 | Pablo Mart\'inez-Mirav\'e | Valentina De Romeri, Pablo Mart\'inez-Mirav\'e, Mariam T\'ortola | Signatures of primordial black hole dark matter at DUNE and THEIA | 17 pages, 6 figures. Matches the version accepted for publication in
JCAP | null | 10.1088/1475-7516/2021/10/051 | null | hep-ph astro-ph.CO hep-ex | http://creativecommons.org/licenses/by/4.0/ | Primordial black holes (PBHs) are a potential dark matter candidate whose
masses can span over many orders of magnitude. If they have masses in the
$10^{15}-10^{17}$ g range, they can emit sizeable fluxes of MeV neutrinos
through evaporation via Hawking radiation. We explore the possibility of
detecting light (non-)rotating PBHs with future neutrino experiments. We focus
on two next generation facilities: the Deep Underground Neutrino Experiment
(DUNE) and THEIA. We simulate the expected event spectra at both experiments
assuming different PBH mass distributions and spins, and we extract the
expected 95% C.L. sensitivities to these scenarios. Our analysis shows that
future neutrino experiments like DUNE and THEIA will be able to set competitive
constraints on PBH dark matter, thus providing complementary probes in a part
of the PBH parameter space currently constrained mainly by photon data.
| [
{
"created": "Wed, 9 Jun 2021 12:25:51 GMT",
"version": "v1"
},
{
"created": "Mon, 28 Jun 2021 17:10:06 GMT",
"version": "v2"
},
{
"created": "Wed, 29 Sep 2021 12:32:29 GMT",
"version": "v3"
}
] | 2022-02-02 | [
[
"De Romeri",
"Valentina",
""
],
[
"Martínez-Miravé",
"Pablo",
""
],
[
"Tórtola",
"Mariam",
""
]
] | Primordial black holes (PBHs) are a potential dark matter candidate whose masses can span over many orders of magnitude. If they have masses in the $10^{15}-10^{17}$ g range, they can emit sizeable fluxes of MeV neutrinos through evaporation via Hawking radiation. We explore the possibility of detecting light (non-)rotating PBHs with future neutrino experiments. We focus on two next generation facilities: the Deep Underground Neutrino Experiment (DUNE) and THEIA. We simulate the expected event spectra at both experiments assuming different PBH mass distributions and spins, and we extract the expected 95% C.L. sensitivities to these scenarios. Our analysis shows that future neutrino experiments like DUNE and THEIA will be able to set competitive constraints on PBH dark matter, thus providing complementary probes in a part of the PBH parameter space currently constrained mainly by photon data. |
hep-ph/9906507 | George Kraniotis | D. Bailin, G.V. Kraniotis, A. Love | Sparticle spectrum in M-theory with five-brane dominance | 12 pages, LaTeX 4 figures (EPS), typos fixed reference added | Phys.Lett.B463:174-180,1999 | 10.1016/S0370-2693(99)00941-7 | SUSX-TH-99-005, RHCPP99-08T | hep-ph | null | The phenomenological implications of the M-theory limit in which
supersymmetry is broken by the F-terms of five-brane moduli is investigated. In
particular we calculate the supersymmetric spectrum subject to constraints of
correct electroweak symmetry breaking. We find interesting differences
especially in the squark sector compared with $M$-theory scenarios with
standard embedding and weakly-coupled Calabi-Yau compactifications in the large
$T$-limit.
| [
{
"created": "Fri, 25 Jun 1999 18:51:21 GMT",
"version": "v1"
},
{
"created": "Wed, 30 Jun 1999 19:10:52 GMT",
"version": "v2"
}
] | 2008-11-26 | [
[
"Bailin",
"D.",
""
],
[
"Kraniotis",
"G. V.",
""
],
[
"Love",
"A.",
""
]
] | The phenomenological implications of the M-theory limit in which supersymmetry is broken by the F-terms of five-brane moduli is investigated. In particular we calculate the supersymmetric spectrum subject to constraints of correct electroweak symmetry breaking. We find interesting differences especially in the squark sector compared with $M$-theory scenarios with standard embedding and weakly-coupled Calabi-Yau compactifications in the large $T$-limit. |
1504.02733 | Jean-Philippe Lansberg | J.P. Lansberg, L. Szymanowski, J. Wagner | Lepton-pair production in ultraperipheral collisions at AFTER@LHC | 21 pages, 19 figures, uses jheppub.sty (included) | null | 10.1007/JHEP09(2015)087 | null | hep-ph hep-ex nucl-ex nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We investigate the potentialities offered by the study of lepton-pair
production in ultraperipheral collisions at a fixed-target experiment using the
proton and ion LHC beams. In these collisions, exclusive or semi-exclusive
lepton-pair production can be used as luminosity monitor as well as a check of
the equivalent-photon approximation, via the measurement of the Bethe-Heitler
cross section. It can also serve as a probe of the inner hadron structure via
the measurement of the lepton-pair azimuthal asymmetry which is sensitive to
the timelike virtual Compton scattering. We also briefly discuss the
possibility offered by the study of eta(c) production. Finally, we outline the
possibilities for lepton-pair production by Pomeron-Odderon fusion in exclusive
pp and pA collisions.
| [
{
"created": "Fri, 10 Apr 2015 16:40:52 GMT",
"version": "v1"
}
] | 2015-10-28 | [
[
"Lansberg",
"J. P.",
""
],
[
"Szymanowski",
"L.",
""
],
[
"Wagner",
"J.",
""
]
] | We investigate the potentialities offered by the study of lepton-pair production in ultraperipheral collisions at a fixed-target experiment using the proton and ion LHC beams. In these collisions, exclusive or semi-exclusive lepton-pair production can be used as luminosity monitor as well as a check of the equivalent-photon approximation, via the measurement of the Bethe-Heitler cross section. It can also serve as a probe of the inner hadron structure via the measurement of the lepton-pair azimuthal asymmetry which is sensitive to the timelike virtual Compton scattering. We also briefly discuss the possibility offered by the study of eta(c) production. Finally, we outline the possibilities for lepton-pair production by Pomeron-Odderon fusion in exclusive pp and pA collisions. |
hep-ph/9908518 | Francesca Rosati | Francesca Rosati (SISSA) | Quintessence, Supersymmetry and Inflation | 5 LaTex pages, no figures; Talk given at the International Workshop
on "Particles in Astrophysics and Cosmology: from Theory to Observations"
(Valencia99), 3-8 May 1999, Valencia, Spain. To appear on Nucl. Phys. B,
Proc. Suppl | Nucl.Phys.Proc.Suppl.81B:52,2000 | 10.1016/S0920-5632(99)00858-0 | null | hep-ph astro-ph gr-qc hep-th | null | Recent data point in the direction of a $\Lambda$ dominated universe. We
briefly review ``Quintessence'' as a model for a dynamical cosmological term
and analyse the role of Susy QCD as a possible particle physics candidate. The
multiscalar content of the theory is fully taken into account and interaction
with other cosmological fields is discussed. Finally, the possibility of
constructing a unified scheme for quintessence and inflation is mentioned.
| [
{
"created": "Tue, 31 Aug 1999 13:51:27 GMT",
"version": "v1"
}
] | 2011-08-05 | [
[
"Rosati",
"Francesca",
"",
"SISSA"
]
] | Recent data point in the direction of a $\Lambda$ dominated universe. We briefly review ``Quintessence'' as a model for a dynamical cosmological term and analyse the role of Susy QCD as a possible particle physics candidate. The multiscalar content of the theory is fully taken into account and interaction with other cosmological fields is discussed. Finally, the possibility of constructing a unified scheme for quintessence and inflation is mentioned. |
hep-ph/9706337 | Ken Kiers | Ken Kiers and Amarjit Soni | Improving constraints on tan(beta)/m_H using B \to D tau \bar{nu} | 19 pages, Latex | Phys.Rev. D56 (1997) 5786-5793 | 10.1103/PhysRevD.56.5786 | null | hep-ph | null | We study the q^2 dependence of the exclusive decay mode B \to D tau \bar{nu}
in type II two Higgs doublet models and show that this mode may be used to put
stringent bounds on tan(beta)/m_H. There are currently rather large theoretical
uncertainties in the q^2 distribution, but these may be significantly reduced
by future measurements of the analogous distribution for B \to D(e,mu)\bar{nu}.
We estimate that this reduction in the theoretical uncertainties would
eventually (i.e., with sufficient data) allow one to push the upper bound on
tan(beta)/m_H down to about 0.06 GeV^{-1}. This would represent an improvement
on the current bound by about a factor of 7. We then apply the method of
optimized observables which allows us to estimate the reach of an experiment
with a given number of events. We thus find that an experiment with, for
example, 10^3 events could set a 2\sigma upper bound on tan(beta)/m_H of 0.07
GeV^{-1} or could differentiate at the 4.6\sigma level between a 2HDM with
tan(beta)/m_H = 0.1 GeV^{-1} and the SM.
| [
{
"created": "Wed, 11 Jun 1997 22:56:56 GMT",
"version": "v1"
}
] | 2009-10-30 | [
[
"Kiers",
"Ken",
""
],
[
"Soni",
"Amarjit",
""
]
] | We study the q^2 dependence of the exclusive decay mode B \to D tau \bar{nu} in type II two Higgs doublet models and show that this mode may be used to put stringent bounds on tan(beta)/m_H. There are currently rather large theoretical uncertainties in the q^2 distribution, but these may be significantly reduced by future measurements of the analogous distribution for B \to D(e,mu)\bar{nu}. We estimate that this reduction in the theoretical uncertainties would eventually (i.e., with sufficient data) allow one to push the upper bound on tan(beta)/m_H down to about 0.06 GeV^{-1}. This would represent an improvement on the current bound by about a factor of 7. We then apply the method of optimized observables which allows us to estimate the reach of an experiment with a given number of events. We thus find that an experiment with, for example, 10^3 events could set a 2\sigma upper bound on tan(beta)/m_H of 0.07 GeV^{-1} or could differentiate at the 4.6\sigma level between a 2HDM with tan(beta)/m_H = 0.1 GeV^{-1} and the SM. |
2008.05022 | Francesca Dordei | M. Cadeddu, N. Cargioli, F. Dordei, C. Giunti, Y.F. Li, E. Picciau and
Y.Y. Zhang | Constraints on light vector mediators through coherent elastic neutrino
nucleus scattering data from COHERENT | 12 pages, 5 figures, matches journal version | JHEP 01 (2021) 116 | 10.1007/JHEP01(2021)116 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present new constraints on three different models, the so-called
universal, $B-L$ and $L_\mu-L_\tau$ models, involving a yet to be observed
light vector $Z'$ mediator, by exploiting the recent observation of coherent
elastic neutrino-nucleus scattering (CE$\nu$NS) in argon and cesium-iodide
performed by the COHERENT Collaboration. We compare the results obtained from a
combination of the above data sets with the limits derived from searches in
fixed target, accelerator, solar neutrino and reactor CE$\nu$NS experiments,
and with the parameter region that could explain the anomalous magnetic moment
of the muon. We show that for the universal and the $B-L$ models, the COHERENT
data allow us to put stringent limits in the light vector mediator mass,
$M_{Z'}$, and coupling, $g_{Z'}$, parameter space.
| [
{
"created": "Tue, 11 Aug 2020 22:28:46 GMT",
"version": "v1"
},
{
"created": "Wed, 19 Aug 2020 21:06:35 GMT",
"version": "v2"
},
{
"created": "Thu, 21 Jan 2021 14:13:35 GMT",
"version": "v3"
}
] | 2021-01-22 | [
[
"Cadeddu",
"M.",
""
],
[
"Cargioli",
"N.",
""
],
[
"Dordei",
"F.",
""
],
[
"Giunti",
"C.",
""
],
[
"Li",
"Y. F.",
""
],
[
"Picciau",
"E.",
""
],
[
"Zhang",
"Y. Y.",
""
]
] | We present new constraints on three different models, the so-called universal, $B-L$ and $L_\mu-L_\tau$ models, involving a yet to be observed light vector $Z'$ mediator, by exploiting the recent observation of coherent elastic neutrino-nucleus scattering (CE$\nu$NS) in argon and cesium-iodide performed by the COHERENT Collaboration. We compare the results obtained from a combination of the above data sets with the limits derived from searches in fixed target, accelerator, solar neutrino and reactor CE$\nu$NS experiments, and with the parameter region that could explain the anomalous magnetic moment of the muon. We show that for the universal and the $B-L$ models, the COHERENT data allow us to put stringent limits in the light vector mediator mass, $M_{Z'}$, and coupling, $g_{Z'}$, parameter space. |
2406.12301 | Ansgar Denner | Ansgar Denner, Daniele Lombardi, Christopher Schwan | Double-pole approximation for leading-order semi-leptonic vector-boson
scattering at the LHC | 48 pages, 18 figures | null | null | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Measuring vector-boson scattering beyond the fully-leptonic final state is
becoming possible at the LHC, which demands to have a solid control on the
theory predictions for all final states of this class of processes. In this
work we present a full off-shell leading-order calculation for the process
$\mathrm{p}\mathrm{p} \to \ell \nu_\ell + 4\mathrm{j}$ in two fiducial regions
which are particularly relevant for its experimental measurement. In addition
to the fully electroweak order, i.e. $\mathcal{O}(\alpha^6)$, we complement our
results with $\mathcal{O}(\alpha_\mathrm{s}\alpha^5)$ and
$\mathcal{O}(\alpha_\mathrm{s}^2\alpha^4)$ for inclusive predictions. At
$\mathcal{O}(\alpha^6)$ we present for the first time a systematic treatment of
the process in double-pole approximation and we perform a detailed study of its
range of validity by considering inclusive and differential predictions
compared to the full off-shell calculation.
| [
{
"created": "Tue, 18 Jun 2024 06:19:09 GMT",
"version": "v1"
}
] | 2024-06-19 | [
[
"Denner",
"Ansgar",
""
],
[
"Lombardi",
"Daniele",
""
],
[
"Schwan",
"Christopher",
""
]
] | Measuring vector-boson scattering beyond the fully-leptonic final state is becoming possible at the LHC, which demands to have a solid control on the theory predictions for all final states of this class of processes. In this work we present a full off-shell leading-order calculation for the process $\mathrm{p}\mathrm{p} \to \ell \nu_\ell + 4\mathrm{j}$ in two fiducial regions which are particularly relevant for its experimental measurement. In addition to the fully electroweak order, i.e. $\mathcal{O}(\alpha^6)$, we complement our results with $\mathcal{O}(\alpha_\mathrm{s}\alpha^5)$ and $\mathcal{O}(\alpha_\mathrm{s}^2\alpha^4)$ for inclusive predictions. At $\mathcal{O}(\alpha^6)$ we present for the first time a systematic treatment of the process in double-pole approximation and we perform a detailed study of its range of validity by considering inclusive and differential predictions compared to the full off-shell calculation. |
hep-ph/9205239 | Ivan | Tzu Chiang Yuan | Anomalous Radiative Decay of Heavy Higgs Boson | 7 pages, 1 figure (not included) NUHEP-TH-92-11 | null | null | null | hep-ph | null | The radiative decay width of a heavy Higgs boson $H \rightarrow W^+W^-\gamma$
for a {\it hard} photon is calculated in the Standard Model and its extension
with anomalous $\gamma WW$ couplings. Its dependence on the Higgs mass, the two
unknown anomalous couplings, and the photon energy cutoff are studied in
detail. We show that this radiative decay of a heavy Higgs is not very
sensitive to a wide range of the anomalous couplings compared to the Standard
Model result.
| [
{
"created": "Wed, 27 May 1992 16:02:37 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Yuan",
"Tzu Chiang",
""
]
] | The radiative decay width of a heavy Higgs boson $H \rightarrow W^+W^-\gamma$ for a {\it hard} photon is calculated in the Standard Model and its extension with anomalous $\gamma WW$ couplings. Its dependence on the Higgs mass, the two unknown anomalous couplings, and the photon energy cutoff are studied in detail. We show that this radiative decay of a heavy Higgs is not very sensitive to a wide range of the anomalous couplings compared to the Standard Model result. |
2102.05062 | German F. R. Sborlini | German F. R. Sborlini | Geometrical approach to causality in multi-loop amplitudes | 11 pages, 4 figures. Extended discussion about selection criteria.
Final version published in PRD | Phys. Rev. D 104, 036014 (2021) | 10.1103/PhysRevD.104.036014 | DESY 21-017 | hep-ph hep-th | http://creativecommons.org/licenses/by/4.0/ | An impressive effort is being placed in order to develop new strategies that
allow an efficient computation of multi-loop multi-leg Feynman integrals and
scattering amplitudes, with a particular emphasis on removing spurious
singularities and numerical instabilities. In this article, we describe an
innovative geometric approach based on graph theory to unveil the causal
structure of any multi-loop multi-leg amplitude in Quantum Field Theory. Our
purely geometric construction reproduces faithfully the manifestly causal
integrand-level behaviour of the Loop-Tree Duality representation. We found
that the causal structure is fully determined by the vertex matrix, through a
suitable definition of connected partitions of the underlying diagrams. Causal
representations for a given topological family are obtained by summing over
subsets of all the possible causal entangled thresholds that originate
connected and oriented partitions of the underlying topology. These results are
compatible with Cutkosky rules. Moreover, we found that diagrams with the same
number of vertices and multi-edges exhibit similar causal structures,
regardless of the number of loops.
| [
{
"created": "Tue, 9 Feb 2021 19:00:06 GMT",
"version": "v1"
},
{
"created": "Wed, 1 Sep 2021 09:43:13 GMT",
"version": "v2"
}
] | 2021-09-08 | [
[
"Sborlini",
"German F. R.",
""
]
] | An impressive effort is being placed in order to develop new strategies that allow an efficient computation of multi-loop multi-leg Feynman integrals and scattering amplitudes, with a particular emphasis on removing spurious singularities and numerical instabilities. In this article, we describe an innovative geometric approach based on graph theory to unveil the causal structure of any multi-loop multi-leg amplitude in Quantum Field Theory. Our purely geometric construction reproduces faithfully the manifestly causal integrand-level behaviour of the Loop-Tree Duality representation. We found that the causal structure is fully determined by the vertex matrix, through a suitable definition of connected partitions of the underlying diagrams. Causal representations for a given topological family are obtained by summing over subsets of all the possible causal entangled thresholds that originate connected and oriented partitions of the underlying topology. These results are compatible with Cutkosky rules. Moreover, we found that diagrams with the same number of vertices and multi-edges exhibit similar causal structures, regardless of the number of loops. |
hep-ph/0107149 | Martin A. Kimber | A. D. Martin (Durham) and M. G. Ryskin (Durham and St Petersburg) | Unintegrated generalised parton distributions | 9 pages including 2 figures | Phys.Rev.D64:094017,2001 | 10.1103/PhysRevD.64.094017 | IPPP/01/31 DCPT/01/62 | hep-ph | null | We show how the generalised (or skewed) parton distributions of the proton,
H(x, xi; k_t^2, mu^2), unintegrated over the partonic transverse momenta, can
be calculated from the known conventional parton distributions, q(x, mu^2) and
g(x, mu^2), for small values of the skewedness parameter xi. We demonstrate the
procedure by numerically evaluating the skewed unintegrated gluon. We also
provide a simple approximate phenomenological form of the distribution, which
may be used to make more rapid predictions of observables.
| [
{
"created": "Fri, 13 Jul 2001 14:44:55 GMT",
"version": "v1"
}
] | 2014-11-17 | [
[
"Martin",
"A. D.",
"",
"Durham"
],
[
"Ryskin",
"M. G.",
"",
"Durham and St Petersburg"
]
] | We show how the generalised (or skewed) parton distributions of the proton, H(x, xi; k_t^2, mu^2), unintegrated over the partonic transverse momenta, can be calculated from the known conventional parton distributions, q(x, mu^2) and g(x, mu^2), for small values of the skewedness parameter xi. We demonstrate the procedure by numerically evaluating the skewed unintegrated gluon. We also provide a simple approximate phenomenological form of the distribution, which may be used to make more rapid predictions of observables. |
1109.3359 | Sabyasachi Ghosh | Santosh K Das, Sabyasachi Ghosh, Sourav Sarkar and Jan-e Alam | Drag and diffusion coefficients of $B$ mesons in hot hadronic matter | 5 pages and 3 figs | Physical Review D 85, 074017 (2012) | 10.1103/PhysRevD.85.074017 | null | hep-ph nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The drag and diffusion coefficients of a hot hadronic medium consisting of
pions, kaons and eta using open beauty mesons as a probe have been evaluated.
The interaction of the probe with the hadronic matter has been treated in the
framework of chiral perturbation theory. It is observed that the magnitude of
both the transport coefficients are significant, indicating substantial amount
of interaction of the heavy mesons with the thermal bath. The results may have
significant impact on the experimental observables like the suppression of
single electron spectra originating from the decays of heavy mesons produced in
nuclear collisions at RHIC and LHC energies
| [
{
"created": "Thu, 15 Sep 2011 14:25:07 GMT",
"version": "v1"
},
{
"created": "Mon, 19 Sep 2011 13:00:18 GMT",
"version": "v2"
},
{
"created": "Fri, 27 Apr 2012 17:41:33 GMT",
"version": "v3"
}
] | 2012-04-30 | [
[
"Das",
"Santosh K",
""
],
[
"Ghosh",
"Sabyasachi",
""
],
[
"Sarkar",
"Sourav",
""
],
[
"Alam",
"Jan-e",
""
]
] | The drag and diffusion coefficients of a hot hadronic medium consisting of pions, kaons and eta using open beauty mesons as a probe have been evaluated. The interaction of the probe with the hadronic matter has been treated in the framework of chiral perturbation theory. It is observed that the magnitude of both the transport coefficients are significant, indicating substantial amount of interaction of the heavy mesons with the thermal bath. The results may have significant impact on the experimental observables like the suppression of single electron spectra originating from the decays of heavy mesons produced in nuclear collisions at RHIC and LHC energies |
hep-ph/0603104 | Yang Bai | Thomas Appelquist, Yang Bai and Maurizio Piai | Quark Mass Ratios and Mixing Angles from SU(3) Family Gauge Symmetry | 6 pages, 1 table, small corrections, added references | Phys.Lett. B637 (2006) 245-250 | 10.1016/j.physletb.2006.04.043 | null | hep-ph | null | We explore a framework for the computation of quark mass ratios and CKM
mixing angles based on an SU(3) family gauge symmetry. The four ratios md/mb,
ms/mb, mu/mt, and mc/mt can be fit at one-loop in the family gauge interaction.
The same is true of the quark mixing angles theta12 and theta23, although the
result for theta13 is too small. The CP violating phase is naturally O(1).
| [
{
"created": "Tue, 14 Mar 2006 19:36:41 GMT",
"version": "v1"
},
{
"created": "Fri, 24 Mar 2006 20:38:59 GMT",
"version": "v2"
}
] | 2009-11-11 | [
[
"Appelquist",
"Thomas",
""
],
[
"Bai",
"Yang",
""
],
[
"Piai",
"Maurizio",
""
]
] | We explore a framework for the computation of quark mass ratios and CKM mixing angles based on an SU(3) family gauge symmetry. The four ratios md/mb, ms/mb, mu/mt, and mc/mt can be fit at one-loop in the family gauge interaction. The same is true of the quark mixing angles theta12 and theta23, although the result for theta13 is too small. The CP violating phase is naturally O(1). |
hep-ph/0502238 | Peter Levai | P. Levai, G. Fai, G. Papp | Di-hadron correlations at ISR and RHIC energies | Modifications in the text and in the title. 12 pages, 4 figures | Phys.Lett. B634 (2006) 383-390 | 10.1016/j.physletb.2006.01.047 | null | hep-ph nucl-ex | null | The structure of hadron-hadron correlations is investigated in proton-proton
collisions.We focus on the transmission of the initial transverse momenta of
partons (``intrinsic $k_T$'') to the hadron-hadron correlations. Values of the
intrinsic transverse momentum obtained from experimental correlations are
compared to the results of a model with partially randomized parton transverse
momenta at ISR and RHIC energies. Procedures for extracting the correlations
from data are discussed.
| [
{
"created": "Sat, 26 Feb 2005 19:42:45 GMT",
"version": "v1"
},
{
"created": "Mon, 3 Apr 2006 02:35:03 GMT",
"version": "v2"
}
] | 2009-11-11 | [
[
"Levai",
"P.",
""
],
[
"Fai",
"G.",
""
],
[
"Papp",
"G.",
""
]
] | The structure of hadron-hadron correlations is investigated in proton-proton collisions.We focus on the transmission of the initial transverse momenta of partons (``intrinsic $k_T$'') to the hadron-hadron correlations. Values of the intrinsic transverse momentum obtained from experimental correlations are compared to the results of a model with partially randomized parton transverse momenta at ISR and RHIC energies. Procedures for extracting the correlations from data are discussed. |
2110.08795 | Hector Gisbert Mullor | Rigo Bause, Hector Gisbert, Marcel Golz, Gudrun Hiller | Dineutrino modes probing lepton flavor violation | Contribution to Proceedings of EPS-HEP2021, 26-30 July 2021, Univ.
Hamburg and DESY, 6 pages, 1 figure | null | null | DO-TH 21/28 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | $SU(2)_L$-invariance links charged dilepton $\bar
q\,q^\prime\,\ell^+\,\ell^-$ and dineutrino $\bar q\, q^\prime\, \bar\nu\,\nu$
couplings. This connection can be established using the Standard Model
Effective Field Theory framework, and allows to perform complementary
experimental tests of lepton universality and charged lepton flavor
conservation with flavor-summed dineutrino observables. We present its
phenomenological implications for the branching ratios of rare charm decays
$c\to u\,\nu\,\bar\nu$ and rare $B$ decays $b\to s\,\bar\nu\,\nu$ decays.
| [
{
"created": "Sun, 17 Oct 2021 11:21:56 GMT",
"version": "v1"
}
] | 2021-10-19 | [
[
"Bause",
"Rigo",
""
],
[
"Gisbert",
"Hector",
""
],
[
"Golz",
"Marcel",
""
],
[
"Hiller",
"Gudrun",
""
]
] | $SU(2)_L$-invariance links charged dilepton $\bar q\,q^\prime\,\ell^+\,\ell^-$ and dineutrino $\bar q\, q^\prime\, \bar\nu\,\nu$ couplings. This connection can be established using the Standard Model Effective Field Theory framework, and allows to perform complementary experimental tests of lepton universality and charged lepton flavor conservation with flavor-summed dineutrino observables. We present its phenomenological implications for the branching ratios of rare charm decays $c\to u\,\nu\,\bar\nu$ and rare $B$ decays $b\to s\,\bar\nu\,\nu$ decays. |
hep-ph/0307039 | Shoji Hashimoto | JLQCD Collaboration: S. Aoki, M. Fukugita, S. Hashimoto, K-I.
Ishikawa, N. Ishizuka, Y. Iwasaki, K. Kanaya, T. Kaneko, Y. Kuramashi, M.
Okawa, T. Onogi, N. Tsutsui, A. Ukawa, N. Yamada, T. Yoshie | B-Bbar mixing in unquenched lattice QCD | 4 pages, 3 figures; version to appear in PRL | Phys.Rev.Lett.91:212001,2003 | 10.1103/PhysRevLett.91.212001 | KEK-CP-140 | hep-ph hep-lat | null | We present an unquenched lattice calculation for the $B^0-\bar{B}^0$
transition amplitude. The calculation, carried out at an inverse lattice
spacing $1/a$ = 2.22(4) GeV, incorporates two flavors of dynamical quarks
described by the fully $O(a)$-improved Wilson fermion action and heavy quarks
described by NRQCD. A particular attention is paid to the uncertainty that
arises from the chiral extrapolation, especially the effect of pion loops, for
light quarks, which we find could be sizable for the leptonic decay of the
$B_d$ meson, whereas it is small for the $B_s$ meson and the $B$ parameters. We
obtain $f_{B_d}=191(10)(^{+12}_{-22})$ MeV, $f_{B_s}/f_{B_d}=1.13(3)(^{+13}_{-\
2})$, $B_{B_d}(m_b)=0.836(27)(^{+56}_{-62})$,
$B_{B_s}/B_{B_d}=1.017(16)(^{+56}_{-17})$, $\xi=1.14(3)(^{+13}_{- 2})$, where
the first error is statistical, and the second is systematic, including
uncertainties due to chiral extrapolation, finite lattice spacing, heavy quark
expansion and perturbative operator matching.
| [
{
"created": "Thu, 3 Jul 2003 04:59:13 GMT",
"version": "v1"
},
{
"created": "Mon, 6 Oct 2003 00:47:17 GMT",
"version": "v2"
}
] | 2008-11-26 | [
[
"JLQCD Collaboration",
"",
""
],
[
"Aoki",
"S.",
""
],
[
"Fukugita",
"M.",
""
],
[
"Hashimoto",
"S.",
""
],
[
"Ishikawa",
"K-I.",
""
],
[
"Ishizuka",
"N.",
""
],
[
"Iwasaki",
"Y.",
""
],
[
"Kanaya",... | We present an unquenched lattice calculation for the $B^0-\bar{B}^0$ transition amplitude. The calculation, carried out at an inverse lattice spacing $1/a$ = 2.22(4) GeV, incorporates two flavors of dynamical quarks described by the fully $O(a)$-improved Wilson fermion action and heavy quarks described by NRQCD. A particular attention is paid to the uncertainty that arises from the chiral extrapolation, especially the effect of pion loops, for light quarks, which we find could be sizable for the leptonic decay of the $B_d$ meson, whereas it is small for the $B_s$ meson and the $B$ parameters. We obtain $f_{B_d}=191(10)(^{+12}_{-22})$ MeV, $f_{B_s}/f_{B_d}=1.13(3)(^{+13}_{-\ 2})$, $B_{B_d}(m_b)=0.836(27)(^{+56}_{-62})$, $B_{B_s}/B_{B_d}=1.017(16)(^{+56}_{-17})$, $\xi=1.14(3)(^{+13}_{- 2})$, where the first error is statistical, and the second is systematic, including uncertainties due to chiral extrapolation, finite lattice spacing, heavy quark expansion and perturbative operator matching. |
hep-ph/0111299 | Rouzbeh Allahverdi | Rouzbeh Allahverdi, Kari Enqvist and Anupam Mazumdar | Possible astrophysical signatures of heavy stable neutral relics in
supergravity models | 12 pages | Phys.Rev.D65:103519,2002 | 10.1103/PhysRevD.65.103519 | TUM-HEP-447/01 | hep-ph astro-ph gr-qc hep-th | null | We consider heavy stable neutral particles in the context of supergravity and
show that a gravitationally suppressed inflaton decay can produce such
particles in cosmologically interesting abundances within a wide mass range
$10^3 {\rm GeV} \leq m_X \leq 10^{11} {\rm GeV}$. In gravity-mediated
supersymmetry breaking models, a heavy particle can decay into its superpartner
and a photon-photino pair or a gravitino. Such decays only change the identity
of a possible dark matter candidate. However, for $10^3 {\rm GeV} \leq m_X \leq
10^7 {\rm GeV}$, astrophysical bounds from gamma-ray background and
photodissociation of light elements can be more stringent than the overclosure
bound, thus ruling out the particle as a dark matter candidate.
| [
{
"created": "Fri, 23 Nov 2001 08:53:34 GMT",
"version": "v1"
}
] | 2009-07-07 | [
[
"Allahverdi",
"Rouzbeh",
""
],
[
"Enqvist",
"Kari",
""
],
[
"Mazumdar",
"Anupam",
""
]
] | We consider heavy stable neutral particles in the context of supergravity and show that a gravitationally suppressed inflaton decay can produce such particles in cosmologically interesting abundances within a wide mass range $10^3 {\rm GeV} \leq m_X \leq 10^{11} {\rm GeV}$. In gravity-mediated supersymmetry breaking models, a heavy particle can decay into its superpartner and a photon-photino pair or a gravitino. Such decays only change the identity of a possible dark matter candidate. However, for $10^3 {\rm GeV} \leq m_X \leq 10^7 {\rm GeV}$, astrophysical bounds from gamma-ray background and photodissociation of light elements can be more stringent than the overclosure bound, thus ruling out the particle as a dark matter candidate. |
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