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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
0707.4319 | Omar Gustavo Miranda | J. Barranco, O. G. Miranda, T. I. Rashba | Improved limit on electron neutrino charge radius through a new
evaluation of the weak mixing angle | 10 pages, 2 figures. Final published version | Phys.Lett.B662:431-435,2008 | 10.1016/j.physletb.2008.03.039 | MPP-2007-99 | hep-ph hep-ex | null | We have obtained a new limit on the electron neutrino effective charge radius
from a new evaluation of the weak mixing angle by a combined fit of all
electron-(anti)neutrino electron elastic scattering measurements. Weak mixing
angle is found to be sin^2 theta_W=0.259 \pm 0.025 in the low energy regime
below 100 MeV. The electron neutrino charge radius squared is bounded to be in
the range -0.13 10^-32 cm^2 < r^2 < 3.32 10^-32 cm^2 at 90 % C.L. Both results
improve previously published analyses. We also discuss perspectives of future
experiments to improve these constraints.
| [
{
"created": "Sun, 29 Jul 2007 21:40:38 GMT",
"version": "v1"
},
{
"created": "Mon, 24 Mar 2008 22:31:27 GMT",
"version": "v2"
},
{
"created": "Tue, 22 Apr 2008 16:00:26 GMT",
"version": "v3"
}
] | 2008-11-26 | [
[
"Barranco",
"J.",
""
],
[
"Miranda",
"O. G.",
""
],
[
"Rashba",
"T. I.",
""
]
] | We have obtained a new limit on the electron neutrino effective charge radius from a new evaluation of the weak mixing angle by a combined fit of all electron-(anti)neutrino electron elastic scattering measurements. Weak mixing angle is found to be sin^2 theta_W=0.259 \pm 0.025 in the low energy regime below 100 MeV. The electron neutrino charge radius squared is bounded to be in the range -0.13 10^-32 cm^2 < r^2 < 3.32 10^-32 cm^2 at 90 % C.L. Both results improve previously published analyses. We also discuss perspectives of future experiments to improve these constraints. |
1010.0841 | Gennady Lykasov I | V.A.Bednyakov, G.I.Lykasov, M.G.Poghosyan | Gluons in proton and soft pp collisions at high energies | Talk given at the workshop "Hadron Structure and QCD: from LOW to
High energies", Gatchina, Russia, July 5-9, 2010; 8 pages, 4 figures | null | null | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The hadron inclusive spectra in pp collisions at high energies are analyzed
within a soft QCD model, namely the quark-gluon string model. In addition to
the sea quark distribution in the incoming proton we consider also the
unintegrated gluon distribution that has an increasing behaviour when the gluon
transverse momentum grows. It leads to an increase of the inclusive spectra of
hadrons and their multiplicity in the central rapidity region of pp collision
at LHC energies.
| [
{
"created": "Tue, 5 Oct 2010 11:05:40 GMT",
"version": "v1"
}
] | 2015-03-17 | [
[
"Bednyakov",
"V. A.",
""
],
[
"Lykasov",
"G. I.",
""
],
[
"Poghosyan",
"M. G.",
""
]
] | The hadron inclusive spectra in pp collisions at high energies are analyzed within a soft QCD model, namely the quark-gluon string model. In addition to the sea quark distribution in the incoming proton we consider also the unintegrated gluon distribution that has an increasing behaviour when the gluon transverse momentum grows. It leads to an increase of the inclusive spectra of hadrons and their multiplicity in the central rapidity region of pp collision at LHC energies. |
0705.4097 | Gary Shiu | Gary Shiu, Bret Underwood, Devin G.E. Walker, Kathryn M. Zurek | Probing the Geometry of Warped String Compactifications at the LHC | 4 pages, 4 figures; v2. typos corrected, references added, improved
resolution of Figure 2 | Phys.Rev.Lett.100:031601,2008 | 10.1103/PhysRevLett.100.031601 | MAD-TH-07-08, MADPH-07-1491, UCB-PTH-07/08 | hep-ph astro-ph hep-ex hep-th | null | Warped string compactifications, characterized by non-singular behavior of
the metric in the infrared (IR), feature departures from the usual anti-de
Sitter warped extra dimensions. We study the implications of the smooth IR
cutoff for Randall-Sundrum (RS) type models. We find that the phenomenology of
the KK gravitons (including their masses and couplings) depends sensitively on
the precise shape of the warp factor in the IR. In particular, we analyze the
warped deformed conifold and find that the spectrum differs significantly from
that of RS, and present a simple prescription (a mass gap ansatz) which can be
used to study the phenomenology of IR modifications to 5-d warped extra
dimensions.
| [
{
"created": "Mon, 28 May 2007 21:03:39 GMT",
"version": "v1"
},
{
"created": "Thu, 10 Jan 2008 19:21:55 GMT",
"version": "v2"
}
] | 2008-11-26 | [
[
"Shiu",
"Gary",
""
],
[
"Underwood",
"Bret",
""
],
[
"Walker",
"Devin G. E.",
""
],
[
"Zurek",
"Kathryn M.",
""
]
] | Warped string compactifications, characterized by non-singular behavior of the metric in the infrared (IR), feature departures from the usual anti-de Sitter warped extra dimensions. We study the implications of the smooth IR cutoff for Randall-Sundrum (RS) type models. We find that the phenomenology of the KK gravitons (including their masses and couplings) depends sensitively on the precise shape of the warp factor in the IR. In particular, we analyze the warped deformed conifold and find that the spectrum differs significantly from that of RS, and present a simple prescription (a mass gap ansatz) which can be used to study the phenomenology of IR modifications to 5-d warped extra dimensions. |
1603.01072 | Artur Ankowski | Artur M. Ankowski, Omar Benhar, Camillo Mariani, and Erica Vagnoni | Effect of the $2p2h$ cross-section uncertainties on an analysis of
neutrino oscillations | 7 pages, 5 figures | Phys. Rev. D 93, 113004 (2016) | 10.1103/PhysRevD.93.113004 | null | hep-ph hep-ex nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We report the results of a study aimed at quantifying the impact on the
oscillation analysis of the uncertainties associated with the description of
the neutrino-nucleus cross section in the two-particle--two-hole sector. The
results of our calculations, based on the kinematic method of energy
reconstruction and carried out comparing two data-driven approaches, show that
the existing discrepancies in the neutrino cross sections have a sizable effect
on the extracted oscillation parameters, particularly in the antineutrino
channel.
| [
{
"created": "Thu, 3 Mar 2016 12:25:33 GMT",
"version": "v1"
},
{
"created": "Wed, 8 Jun 2016 01:40:07 GMT",
"version": "v2"
}
] | 2016-06-09 | [
[
"Ankowski",
"Artur M.",
""
],
[
"Benhar",
"Omar",
""
],
[
"Mariani",
"Camillo",
""
],
[
"Vagnoni",
"Erica",
""
]
] | We report the results of a study aimed at quantifying the impact on the oscillation analysis of the uncertainties associated with the description of the neutrino-nucleus cross section in the two-particle--two-hole sector. The results of our calculations, based on the kinematic method of energy reconstruction and carried out comparing two data-driven approaches, show that the existing discrepancies in the neutrino cross sections have a sizable effect on the extracted oscillation parameters, particularly in the antineutrino channel. |
0709.0161 | Hagop Sazdjian | H. Sazdjian | Integral equation for gauge invariant quark two-point Green's function
in QCD | 28 pages, 4 figures | Phys.Rev.D77:045028,2008 | 10.1103/PhysRevD.77.045028 | IPNO-DR-07-03 | hep-ph | null | Gauge invariant quark two-point Green's functions defined with path-ordered
gluon field phase factors along skew-polygonal lines joining the quark to the
antiquark are considered. Functional relations between Green's functions with
different numbers of path segments are established. An integral equation is
obtained for the Green's function defined with a phase factor along a single
straight line. The equation implicates an infinite series of two-point Green's
functions, having an increasing number of path segments; the related kernels
involve Wilson loops with contours corresponding to the skew-polygonal lines of
the accompanying Green's function and with functional derivatives along the
sides of the contours. The series can be viewed as an expansion in terms of the
global number of the functional derivatives of the Wilson loops. The
lowest-order kernel, which involves a Wilson loop with two functional
derivatives, provides the framework for an approximate resolution of the
equation.
| [
{
"created": "Mon, 3 Sep 2007 08:17:04 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Sazdjian",
"H.",
""
]
] | Gauge invariant quark two-point Green's functions defined with path-ordered gluon field phase factors along skew-polygonal lines joining the quark to the antiquark are considered. Functional relations between Green's functions with different numbers of path segments are established. An integral equation is obtained for the Green's function defined with a phase factor along a single straight line. The equation implicates an infinite series of two-point Green's functions, having an increasing number of path segments; the related kernels involve Wilson loops with contours corresponding to the skew-polygonal lines of the accompanying Green's function and with functional derivatives along the sides of the contours. The series can be viewed as an expansion in terms of the global number of the functional derivatives of the Wilson loops. The lowest-order kernel, which involves a Wilson loop with two functional derivatives, provides the framework for an approximate resolution of the equation. |
hep-ph/9405387 | Jutta Kunz | Burkhard Kleihaus and Jutta Kunz | Multisphalerons in the Weinberg-Salam Theory | 18 pages, latex, 17 figures in uuencoded postscript files. THU-94/11 | Phys.Rev. D50 (1994) 5343-5351 | 10.1103/PhysRevD.50.5343 | null | hep-ph | null | We construct multisphaleron solutions in the Weinberg-Salam theory. The
multisphaleron solutions carry Chern-Simons charge $n/2$, where $n$ is an
integer, counting the winding of the fields in the azimuthal angle. The
well-known sphaleron has $n=1$. The multisphalerons possess axial symmetry and
parity reflection symmetry. We vary the Higgs mass and the mixing angle. For
small $n$ the energies of the multisphalerons are on the order of $n$ times the
energy of the sphaleron and their magnetic dipole moments are on the order of
$n$ times the magnetic dipole moment of the sphaleron.
| [
{
"created": "Thu, 26 May 1994 12:56:46 GMT",
"version": "v1"
}
] | 2009-10-28 | [
[
"Kleihaus",
"Burkhard",
""
],
[
"Kunz",
"Jutta",
""
]
] | We construct multisphaleron solutions in the Weinberg-Salam theory. The multisphaleron solutions carry Chern-Simons charge $n/2$, where $n$ is an integer, counting the winding of the fields in the azimuthal angle. The well-known sphaleron has $n=1$. The multisphalerons possess axial symmetry and parity reflection symmetry. We vary the Higgs mass and the mixing angle. For small $n$ the energies of the multisphalerons are on the order of $n$ times the energy of the sphaleron and their magnetic dipole moments are on the order of $n$ times the magnetic dipole moment of the sphaleron. |
hep-ph/9303216 | J. Gunion | John F. Gunion, T.C. Yuan, and B. Grzadkowski | Gluon Fusion: A Probe of Higgs Sector CP Violation | UCD-93-2 | Phys.Rev.Lett.71:488-491,1993; ERRATUM-ibid.71:2681,1993 | 10.1103/PhysRevLett.71.488 | null | hep-ph | null | We demonstrate that CP violation in the Higgs sector, \eg\ of a multi-doublet
model, can be directly probed using gluon-gluon collisions at the SSC. %
requires phyzzx.tex macro package
| [
{
"created": "Wed, 3 Mar 1993 16:27:00 GMT",
"version": "v1"
}
] | 2010-11-01 | [
[
"Gunion",
"John F.",
""
],
[
"Yuan",
"T. C.",
""
],
[
"Grzadkowski",
"B.",
""
]
] | We demonstrate that CP violation in the Higgs sector, \eg\ of a multi-doublet model, can be directly probed using gluon-gluon collisions at the SSC. % requires phyzzx.tex macro package |
hep-ph/9307235 | Evan Reidell | Xiangdong Ji | Chiral-Odd and Spin-Dependent Quark Fragmentation Functions and their
Applications | 19 pages in Plain TeX, MIT CTP #2219 | Phys.Rev. D49 (1994) 114-124 | 10.1103/PhysRevD.49.114 | null | hep-ph | null | We define a number of quark fragmentation functions for spin-0, -1/2 and -1
hadrons, and classify them according to their twist, spin and chirality. As an
example of their applications, we use them to analyze semi-inclusive
deep-inelastic scattering on a transversely polarized nucleon.
| [
{
"created": "Thu, 8 Jul 1993 19:48:49 GMT",
"version": "v1"
}
] | 2009-10-22 | [
[
"Ji",
"Xiangdong",
""
]
] | We define a number of quark fragmentation functions for spin-0, -1/2 and -1 hadrons, and classify them according to their twist, spin and chirality. As an example of their applications, we use them to analyze semi-inclusive deep-inelastic scattering on a transversely polarized nucleon. |
2005.00109 | Philip D. Mannheim | Philip D. Mannheim, Peter Lowdon and Stanley J. Brodsky | Comparing light-front quantization with instant-time quantization | 72 pages, 2 figures. Expanded version of arXiv:1909.03548, includes
discussion of light-front Lehmann representation and connection between
light-front and instant-time Hamiltonians | null | null | SLAC-PUB-17390 | hep-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We compare light-front quantization and instant-time quantization both at the
level of operators and at the level of their Feynman diagram matrix elements.
At the level of operators light-front quantization and instant-time
quantization lead to equal light-front time commutation (or anticommutation)
relations that appear to be quite different from equal instant-time commutation
(or anticommutation) relations. Despite this we show that at unequal times
instant-time and light-front commutation (or anticommutation) relations
actually can be transformed into each other, with it only being the restriction
to equal times that makes the commutation (or anticommutation) relations appear
to be so different. While our results are valid for both bosons and fermions,
for fermions there are subtleties associated with tip of the light cone
contributions that need to be taken care of. At the level of Feynman diagrams
we show for non-vacuum Feynman diagrams that the pole terms in four-dimensional
light-front Feynman diagrams reproduce the three-dimensional light-front
on-shell Hamiltonian Fock space formulation in which the light-front energy and
light-front momentum are on shell. However, because of circle at infinity
contributions we show that this equivalence fails for four-dimensional
light-front vacuum tadpole diagrams. Then, precisely because of these circle at
infinity contributions, light-front vacuum tadpole diagrams are not only
nonzero, they are actually equal to instant-time vacuum tadpole diagrams.
Light-front vacuum diagrams are not correctly describable by the on-shell
Hamiltonian formalism, and thus not by the closely related infinite momentum
frame prescription either. With the transformation from instant-time fields to
light-front fields being a spacetime translation, not only are instant-time
quantization and light-front quantization equivalent, they are unitarily
equivalent.
| [
{
"created": "Thu, 30 Apr 2020 21:15:19 GMT",
"version": "v1"
},
{
"created": "Fri, 3 Jul 2020 20:32:11 GMT",
"version": "v2"
}
] | 2020-09-01 | [
[
"Mannheim",
"Philip D.",
""
],
[
"Lowdon",
"Peter",
""
],
[
"Brodsky",
"Stanley J.",
""
]
] | We compare light-front quantization and instant-time quantization both at the level of operators and at the level of their Feynman diagram matrix elements. At the level of operators light-front quantization and instant-time quantization lead to equal light-front time commutation (or anticommutation) relations that appear to be quite different from equal instant-time commutation (or anticommutation) relations. Despite this we show that at unequal times instant-time and light-front commutation (or anticommutation) relations actually can be transformed into each other, with it only being the restriction to equal times that makes the commutation (or anticommutation) relations appear to be so different. While our results are valid for both bosons and fermions, for fermions there are subtleties associated with tip of the light cone contributions that need to be taken care of. At the level of Feynman diagrams we show for non-vacuum Feynman diagrams that the pole terms in four-dimensional light-front Feynman diagrams reproduce the three-dimensional light-front on-shell Hamiltonian Fock space formulation in which the light-front energy and light-front momentum are on shell. However, because of circle at infinity contributions we show that this equivalence fails for four-dimensional light-front vacuum tadpole diagrams. Then, precisely because of these circle at infinity contributions, light-front vacuum tadpole diagrams are not only nonzero, they are actually equal to instant-time vacuum tadpole diagrams. Light-front vacuum diagrams are not correctly describable by the on-shell Hamiltonian formalism, and thus not by the closely related infinite momentum frame prescription either. With the transformation from instant-time fields to light-front fields being a spacetime translation, not only are instant-time quantization and light-front quantization equivalent, they are unitarily equivalent. |
2106.09598 | Eugenio Megias | Eugenio Megias, Mariano Quiros | Analytical Green's Functions for Continuum Spectra | 46 pages, 16 figures; v2 extended version: added reference [52] and
Fig. 15, extended discussion in Secs. 2, 3.1, 3.3, 3.4 and Appendix A. Typos
corrected. It matches the version published in Journal of High Energy Physics | null | 10.1007/JHEP09(2021)157 | null | hep-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Green's functions with continuum spectra are a way of avoiding the strong
bounds on new physics from the absence of new narrow resonances in experimental
data. We model such a situation with a five-dimensional model with two branes
along the extra dimension $z$, the ultraviolet (UV) and the infrared (IR) one,
such that the metric between the UV and the IR brane is AdS$_5$, thus solving
the hierarchy problem, and beyond the IR brane the metric is that of a linear
dilaton model, which extends to $z\to\infty$. This simplified metric, which can
be considered as an approximation of a more complicated (and smooth) one, leads
to analytical Green's functions (with a mass gap $m_g \sim \textrm{TeV}$ and a
continuum for $s > m_g^2$) which could then be easily incorporated in the
experimental codes. The theory contains Standard Model gauge bosons in the bulk
with Neumann boundary conditions in the UV brane. To cope with electroweak
observables the theory is also endowed with an extra custodial gauge symmetry
in the bulk, with gauge bosons with Dirichlet boundary conditions in the UV
brane, and without zero (massless) modes. All Green's functions have analytical
expressions and exhibit poles in the second Riemann sheet of the complex plane
at $s=M_n^2-i M_n\Gamma_n$, denoting a discrete (infinite) set of broad
resonances with masses ($M_n$) and widths ($\Gamma_n$). For gauge bosons with
Neumann or Dirichlet boundary conditions, the masses and widths of resonances
satisfy the (approximate) equation $s= - 4 m_g^2 \mathcal W_n^2[\pm (1+i)/4]$,
where $\mathcal W_n$ is the $n$-th branch of the Lambert function.
| [
{
"created": "Thu, 17 Jun 2021 15:29:58 GMT",
"version": "v1"
},
{
"created": "Sat, 25 Sep 2021 14:59:32 GMT",
"version": "v2"
}
] | 2021-10-13 | [
[
"Megias",
"Eugenio",
""
],
[
"Quiros",
"Mariano",
""
]
] | Green's functions with continuum spectra are a way of avoiding the strong bounds on new physics from the absence of new narrow resonances in experimental data. We model such a situation with a five-dimensional model with two branes along the extra dimension $z$, the ultraviolet (UV) and the infrared (IR) one, such that the metric between the UV and the IR brane is AdS$_5$, thus solving the hierarchy problem, and beyond the IR brane the metric is that of a linear dilaton model, which extends to $z\to\infty$. This simplified metric, which can be considered as an approximation of a more complicated (and smooth) one, leads to analytical Green's functions (with a mass gap $m_g \sim \textrm{TeV}$ and a continuum for $s > m_g^2$) which could then be easily incorporated in the experimental codes. The theory contains Standard Model gauge bosons in the bulk with Neumann boundary conditions in the UV brane. To cope with electroweak observables the theory is also endowed with an extra custodial gauge symmetry in the bulk, with gauge bosons with Dirichlet boundary conditions in the UV brane, and without zero (massless) modes. All Green's functions have analytical expressions and exhibit poles in the second Riemann sheet of the complex plane at $s=M_n^2-i M_n\Gamma_n$, denoting a discrete (infinite) set of broad resonances with masses ($M_n$) and widths ($\Gamma_n$). For gauge bosons with Neumann or Dirichlet boundary conditions, the masses and widths of resonances satisfy the (approximate) equation $s= - 4 m_g^2 \mathcal W_n^2[\pm (1+i)/4]$, where $\mathcal W_n$ is the $n$-th branch of the Lambert function. |
2012.14575 | Yu-Kuo Hsiao | Yao Yu and Yu-Kuo Hsiao | Cabibbo-favored $\Lambda^+_c\to\Lambda a_{0}(980)^+$ decay in the final
state interaction | 10 pages, 2 figures, version to appear in Physics Letters B | null | 10.1016/j.physletb.2021.136586 | null | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The anti-triplet charmed baryon decays with the light scalar mesons are
rarely measured, whereas the recent observation of the Cabibbo-favored
$\Lambda_c^+\to \Lambda\eta\pi^+$ decay hints a possible $\Lambda_c^+\to\Lambda
a_0(980)^+,a_0(980)^+\to \eta\pi^+$ process. We hence study the
$\Lambda_c^+\to\Lambda a_0(980)^+$ decay. Particularly, it is found that the
final state interaction can give a significant contribution, where
$\Sigma^{+}(1385)$ and $\eta$ in $\Lambda_c^+\to \Sigma^{+}(1385)\eta$ by
exchanging a charged pion are transformed as $\Lambda$ and $a_0(980)^+$,
respectively. Accordingly, we predict ${\cal B}(\Lambda_c^+\to\Lambda
a_0(980)^+)=(1.7^{+2.8}_{-1.0}\pm 0.3)\times 10^{-3}$, accessible to the
BESIII, BELLEII and LHCb experiments.
| [
{
"created": "Tue, 29 Dec 2020 02:45:34 GMT",
"version": "v1"
},
{
"created": "Sat, 21 Aug 2021 06:17:02 GMT",
"version": "v2"
}
] | 2021-08-25 | [
[
"Yu",
"Yao",
""
],
[
"Hsiao",
"Yu-Kuo",
""
]
] | The anti-triplet charmed baryon decays with the light scalar mesons are rarely measured, whereas the recent observation of the Cabibbo-favored $\Lambda_c^+\to \Lambda\eta\pi^+$ decay hints a possible $\Lambda_c^+\to\Lambda a_0(980)^+,a_0(980)^+\to \eta\pi^+$ process. We hence study the $\Lambda_c^+\to\Lambda a_0(980)^+$ decay. Particularly, it is found that the final state interaction can give a significant contribution, where $\Sigma^{+}(1385)$ and $\eta$ in $\Lambda_c^+\to \Sigma^{+}(1385)\eta$ by exchanging a charged pion are transformed as $\Lambda$ and $a_0(980)^+$, respectively. Accordingly, we predict ${\cal B}(\Lambda_c^+\to\Lambda a_0(980)^+)=(1.7^{+2.8}_{-1.0}\pm 0.3)\times 10^{-3}$, accessible to the BESIII, BELLEII and LHCb experiments. |
1806.08597 | Mohammad Athar SAJJAD | A. Fatima, M. Sajjad Athar, and S. K. Singh | Second class currents and T violation in quasielastic neutrino and
antineutrino scattering from nucleons | 29 pages, 17 figures, 1 table | Phys. Rev. D 98, 033005 (2018) | 10.1103/PhysRevD.98.033005 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The effect of the second class currents with and without time reversal
invariance has been studied in the quasielastic production of nucleons and
hyperons induced by neutrinos and antineutrinos from the nucleons. The
numerical results are presented for the total scattering cross
section~($\sigma$) as well as for the longitudinal, perpendicular and
transverse components of the polarization of the final baryons ($p$, $n$,
$\Lambda$, $\Sigma^-$, $\Sigma^0$) and muon produced in the quasielastic
(anti)neutrino-nucleon scattering induced by the weak charged current. In the
case of the production of $\Lambda$ hyperon, which is the most suitable
candidate for making the polarization measurements, we have also calculated the
$Q^2$ dependence of the polarization observables and the differential
scattering cross section ($d\sigma/dQ^2$). The measurement of the polarization
observables and their $Q^2$ dependence provides an independent way to determine
the nucleon-hyperon transition form factors at high $Q^2$ which can provide
tests of the symmetries of the weak hadronic currents like G-invariance, T
invariance and SU(3) symmetry.
| [
{
"created": "Fri, 22 Jun 2018 11:02:32 GMT",
"version": "v1"
},
{
"created": "Fri, 16 Nov 2018 07:39:52 GMT",
"version": "v2"
}
] | 2018-11-19 | [
[
"Fatima",
"A.",
""
],
[
"Athar",
"M. Sajjad",
""
],
[
"Singh",
"S. K.",
""
]
] | The effect of the second class currents with and without time reversal invariance has been studied in the quasielastic production of nucleons and hyperons induced by neutrinos and antineutrinos from the nucleons. The numerical results are presented for the total scattering cross section~($\sigma$) as well as for the longitudinal, perpendicular and transverse components of the polarization of the final baryons ($p$, $n$, $\Lambda$, $\Sigma^-$, $\Sigma^0$) and muon produced in the quasielastic (anti)neutrino-nucleon scattering induced by the weak charged current. In the case of the production of $\Lambda$ hyperon, which is the most suitable candidate for making the polarization measurements, we have also calculated the $Q^2$ dependence of the polarization observables and the differential scattering cross section ($d\sigma/dQ^2$). The measurement of the polarization observables and their $Q^2$ dependence provides an independent way to determine the nucleon-hyperon transition form factors at high $Q^2$ which can provide tests of the symmetries of the weak hadronic currents like G-invariance, T invariance and SU(3) symmetry. |
1909.00375 | Maciej Rybczynski | Maksym Deliyergiyev and Maciej Rybczynski | Multiplicity fluctuations in the Glauber Monte Carlo approach | 18 pages, 8 figures | Phys. Rev. C 101, 014909 (2020) | 10.1103/PhysRevC.101.014909 | null | hep-ph nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We discuss multiplicity fluctuations of charged particles produced in nuclear
collisions measured event-by-event by the NA49 experiment at CERN SPS within
the Glauber Monte Carlo approach. We use the concepts of wounded nucleons and
wounded quarks in the mechanism of multiparticle production to characterize
multiplicity fluctuations expressed by the scaled variance of multiplicity
distribution. Although Wounded Nucleon Model correctly reproduce the centrality
dependence of the average multiplicity in Pb+Pb collisions, it completely fails
in description of corresponding centrality dependence of scaled variance of
multiplicity distribution. Using subnucleonic degrees of freedom, i.e. wounded
quarks within Wounded Quark Model, it is possible to describe quite well the
multiplicity distribution of charged particles produced in proton+proton
interactions. However, the Wounded Quark Model with parameters describing
multiplicity distribution of particles produced in proton+proton interactions
substantially exceeds the average multiplicity of charged particles produced in
Pb+Pb collisions. To obtain values of average multiplicities close to those
experimentally measured in Pb+Pb collisions, the concept of shadowed quark
sources is implemented. Wounded Quark Model with implemented shadowing source
scenario reproduces the centrality dependence of scaled variance of
multiplicity distribution of charged particles produced in Pb+Pb collisions in
the range from the most central to mid-peripheral interactions.
| [
{
"created": "Sun, 1 Sep 2019 10:44:48 GMT",
"version": "v1"
}
] | 2020-01-22 | [
[
"Deliyergiyev",
"Maksym",
""
],
[
"Rybczynski",
"Maciej",
""
]
] | We discuss multiplicity fluctuations of charged particles produced in nuclear collisions measured event-by-event by the NA49 experiment at CERN SPS within the Glauber Monte Carlo approach. We use the concepts of wounded nucleons and wounded quarks in the mechanism of multiparticle production to characterize multiplicity fluctuations expressed by the scaled variance of multiplicity distribution. Although Wounded Nucleon Model correctly reproduce the centrality dependence of the average multiplicity in Pb+Pb collisions, it completely fails in description of corresponding centrality dependence of scaled variance of multiplicity distribution. Using subnucleonic degrees of freedom, i.e. wounded quarks within Wounded Quark Model, it is possible to describe quite well the multiplicity distribution of charged particles produced in proton+proton interactions. However, the Wounded Quark Model with parameters describing multiplicity distribution of particles produced in proton+proton interactions substantially exceeds the average multiplicity of charged particles produced in Pb+Pb collisions. To obtain values of average multiplicities close to those experimentally measured in Pb+Pb collisions, the concept of shadowed quark sources is implemented. Wounded Quark Model with implemented shadowing source scenario reproduces the centrality dependence of scaled variance of multiplicity distribution of charged particles produced in Pb+Pb collisions in the range from the most central to mid-peripheral interactions. |
hep-ph/0110368 | Michael Beyer | S. Mattiello, M. Beyer (Rostock U), T. Frederico (Sao Paulo, Inst.
Tech. Aeronautics), H. J. Weber (Virginia U.) | Correlations in hot and dense quark matter | 6 pages, 4 figure, Few-Body Systems style files | Few Body Syst. 31 (2002) 159-164 | 10.1007/s006010200015 | null | hep-ph | null | We present a relativistic three-body equation to investigate three-quark
clusters in hot and dense quark matter. To derive such an equation we use the
Dyson equation approach. The equation systematically includes the Pauli
blocking factors as well as the self energy corrections of quarks. Special
relativity is realized through the light front form. Presently we use a
zero-range force and investigate the Mott transition.
| [
{
"created": "Mon, 29 Oct 2001 15:22:03 GMT",
"version": "v1"
}
] | 2009-11-07 | [
[
"Mattiello",
"S.",
"",
"Rostock U"
],
[
"Beyer",
"M.",
"",
"Rostock U"
],
[
"Frederico",
"T.",
"",
"Sao Paulo, Inst.\n Tech. Aeronautics"
],
[
"Weber",
"H. J.",
"",
"Virginia U."
]
] | We present a relativistic three-body equation to investigate three-quark clusters in hot and dense quark matter. To derive such an equation we use the Dyson equation approach. The equation systematically includes the Pauli blocking factors as well as the self energy corrections of quarks. Special relativity is realized through the light front form. Presently we use a zero-range force and investigate the Mott transition. |
2306.08453 | Juan Marchant Gonz\'alez | Cesar Bonilla, A. E. C\'arcamo Hern\'andez, Basti\'an D\'iaz S\'aez,
Sergey Kovalenko and Juan Marchant Gonz\'alez | Dark Matter from a Radiative Inverse Seesaw Majoron Model | 15 pages, 6 figures | Physics Letters B, 847, 138282 (2023) | 10.1016/j.physletb.2023.138282 | null | hep-ph | http://creativecommons.org/licenses/by-nc-sa/4.0/ | We propose a Majoron-like extension of the Standard Model with an extra
global $U(1)_X$-symmetry where neutrino masses are generated through an inverse
seesaw mechanism at the 1-loop level. In contrast to the tree-level inverse
seesaw, our framework contains dark matter (DM) candidates stabilized by a
residual $\mathcal{Z}_2$-symmetry surviving spontaneous breaking of the
$U(1)_X$-group. We explore the case in which the DM is a Majorana fermion.
Furthermore, we provide parameter space regions allowed by current experimental
constraints coming from the dark matter relic abundance, (in)direct detection,
and charged lepton flavor violation.
| [
{
"created": "Wed, 14 Jun 2023 11:54:17 GMT",
"version": "v1"
},
{
"created": "Mon, 15 Jan 2024 00:27:06 GMT",
"version": "v2"
}
] | 2024-01-17 | [
[
"Bonilla",
"Cesar",
""
],
[
"Hernández",
"A. E. Cárcamo",
""
],
[
"Sáez",
"Bastián Díaz",
""
],
[
"Kovalenko",
"Sergey",
""
],
[
"González",
"Juan Marchant",
""
]
] | We propose a Majoron-like extension of the Standard Model with an extra global $U(1)_X$-symmetry where neutrino masses are generated through an inverse seesaw mechanism at the 1-loop level. In contrast to the tree-level inverse seesaw, our framework contains dark matter (DM) candidates stabilized by a residual $\mathcal{Z}_2$-symmetry surviving spontaneous breaking of the $U(1)_X$-group. We explore the case in which the DM is a Majorana fermion. Furthermore, we provide parameter space regions allowed by current experimental constraints coming from the dark matter relic abundance, (in)direct detection, and charged lepton flavor violation. |
2403.04987 | Jia-Zhi Huang | Jia-Zhi Huang, Yu-Feng Zhou | Constraints on evaporating primordial black holes from the AMS-02
positron data | null | null | null | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Cosmic-ray (CR) positrons are relatively rare due to its secondary origin and
thus sensitive to exotic contributions. Primordial black holes (PBHs) with
masses above $\sim 5\times10^{14}\,\mathrm{g}$ can be stable sources of CR
positrons due to Hawking radiation. We show that the CR positron flux measured
by AMS-02 can place stringent constraints on the energy fraction of PBHs
relative to that of dark matter $f_{\text{PBH}}$. Making use of the
state-of-the-art models for CR propagation in both the Galaxy and heliosphere,
we obtain conservative upper limit of $f_{\text{PBH}}\lesssim3\times 10^{-4}$
at $M_{\mathrm{PBH}}\simeq2\times 10^{16}$ g, which improves the previous
constraints obtained from the Voyager CR all-electron data by around an order
of magnitude.
| [
{
"created": "Fri, 8 Mar 2024 01:59:51 GMT",
"version": "v1"
}
] | 2024-03-11 | [
[
"Huang",
"Jia-Zhi",
""
],
[
"Zhou",
"Yu-Feng",
""
]
] | Cosmic-ray (CR) positrons are relatively rare due to its secondary origin and thus sensitive to exotic contributions. Primordial black holes (PBHs) with masses above $\sim 5\times10^{14}\,\mathrm{g}$ can be stable sources of CR positrons due to Hawking radiation. We show that the CR positron flux measured by AMS-02 can place stringent constraints on the energy fraction of PBHs relative to that of dark matter $f_{\text{PBH}}$. Making use of the state-of-the-art models for CR propagation in both the Galaxy and heliosphere, we obtain conservative upper limit of $f_{\text{PBH}}\lesssim3\times 10^{-4}$ at $M_{\mathrm{PBH}}\simeq2\times 10^{16}$ g, which improves the previous constraints obtained from the Voyager CR all-electron data by around an order of magnitude. |
hep-ph/0701027 | Richard Lemmer | R. H. Lemmer | Calculation of the two-photon decay width of the f_0(980) scalar meson | 14 pages, 3 figures. Fig.3 replaced. Additional remarks with
references | Phys.Lett.B650:152-158,2007 | 10.1016/j.physletb.2007.03.071 | null | hep-ph | null | The applicability of the quasi-static approximation for calculating the
two-photon annihilation rate of the scalar f_0(980) meson envisaged as a K\bar
K molecule is critically re-examined. It is shown that the validity of this
approximation depends on the detailed interplay between the momentum dependence
of the annihilation amplitude and the momentum transform of the bound state
wave function of the annihilating pair. The approximation becomes invalid when
these two scales of variation are similar. An improved method of calculation
based on the inclusion of electromagnetic corrections to the kernel of the
Bethe-Salpeter equation for the interacting K\bar K pair is outlined to cover
this case and applied to re-evaluate the two-photon decay width for f_0(980) in
a one boson exchange model for the interkaon interaction. The corrections are
significant and result in a much better agreement with experiment.
| [
{
"created": "Thu, 4 Jan 2007 11:47:59 GMT",
"version": "v1"
},
{
"created": "Tue, 20 Mar 2007 11:35:18 GMT",
"version": "v2"
},
{
"created": "Wed, 21 Nov 2007 08:07:17 GMT",
"version": "v3"
}
] | 2008-11-26 | [
[
"Lemmer",
"R. H.",
""
]
] | The applicability of the quasi-static approximation for calculating the two-photon annihilation rate of the scalar f_0(980) meson envisaged as a K\bar K molecule is critically re-examined. It is shown that the validity of this approximation depends on the detailed interplay between the momentum dependence of the annihilation amplitude and the momentum transform of the bound state wave function of the annihilating pair. The approximation becomes invalid when these two scales of variation are similar. An improved method of calculation based on the inclusion of electromagnetic corrections to the kernel of the Bethe-Salpeter equation for the interacting K\bar K pair is outlined to cover this case and applied to re-evaluate the two-photon decay width for f_0(980) in a one boson exchange model for the interkaon interaction. The corrections are significant and result in a much better agreement with experiment. |
1901.05822 | Mathias Pierre | Mathias Pierre | Dark Matter phenomenology : from simplified WIMP models to refined
alternative solutions | PhD Thesis, 273 pages | null | null | 2018SACLS238 | hep-ph astro-ph.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | One of the most puzzling problems of modern physics is the identification of
the nature a non-relativistic matter component present in the universe,
contributing to more than 25$\%$ of the total energy budget, known as Dark
Matter. Weakly Interacting Massive Particles (WIMPs) are among the best
motivated dark matter candidates. However, in light of non conclusive detection
signals and strong constraints from collider, direct and indirect detection
experiments, this thesis presents constraints on several realizations of the
WIMP paradigm in the context of simplified dark matter models. More elaborated
models considering extended gauge structures are discussed further on, such as
constructions involving generalized Chern-Simons couplings and a specific WIMP
scenario motivated by recently observed flavour anomalies related to the
$R_{K^{(*)}}$ observable. The second part of this thesis is devoted to the
discussion of an alternative dark matter thermal production mechanism where an
explicit realization of the Strongly Interacting Massive Particles (SIMPs)
paradigm is discussed in the context of a non-Abelian hidden gauge structure.
In a last part, the possibility of producing non-thermally a dark matter
component via the "freeze-in" mechanism was investigated and the strong impact
of the post-inflationary reaheating stage of the universe on such constructions
illustrated by the specific case where dark matter density production is
mediated by a heavy spin-2 field in addition to the standard graviton.
| [
{
"created": "Thu, 17 Jan 2019 14:58:02 GMT",
"version": "v1"
}
] | 2019-01-18 | [
[
"Pierre",
"Mathias",
""
]
] | One of the most puzzling problems of modern physics is the identification of the nature a non-relativistic matter component present in the universe, contributing to more than 25$\%$ of the total energy budget, known as Dark Matter. Weakly Interacting Massive Particles (WIMPs) are among the best motivated dark matter candidates. However, in light of non conclusive detection signals and strong constraints from collider, direct and indirect detection experiments, this thesis presents constraints on several realizations of the WIMP paradigm in the context of simplified dark matter models. More elaborated models considering extended gauge structures are discussed further on, such as constructions involving generalized Chern-Simons couplings and a specific WIMP scenario motivated by recently observed flavour anomalies related to the $R_{K^{(*)}}$ observable. The second part of this thesis is devoted to the discussion of an alternative dark matter thermal production mechanism where an explicit realization of the Strongly Interacting Massive Particles (SIMPs) paradigm is discussed in the context of a non-Abelian hidden gauge structure. In a last part, the possibility of producing non-thermally a dark matter component via the "freeze-in" mechanism was investigated and the strong impact of the post-inflationary reaheating stage of the universe on such constructions illustrated by the specific case where dark matter density production is mediated by a heavy spin-2 field in addition to the standard graviton. |
1509.02406 | Rados{\l}aw Kycia | S. Jadach and R.A. Kycia | Lineshape of the Higgs boson in future lepton colliders | 18 pages, 7 figures; added new references | null | 10.1016/j.physletb.2016.01.065 | null | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The effect of the photon emission (bremsstrahlung) in the cross section of
the process of direct production of the Higgs boson in the future high
luminosity electron and muon colliders is calculated. It was found that cross
section at the top of the Higgs boson resonance peak is reduced by factor 0.347
for the electron collider and 0.548 for the muon collider. Machine spread of
the centre of the mass energy of 4.2MeV (equal to the Higgs width) would reduce
peak cross section further, by factor 0.170 and 0.256 (QED and energy spread)
for electron and muon beams respectively. Possible uncertainties in the
resummed QED calculations are discussed. Numerical results for the lineshape
cross section including QED and many values of the machine energy spread are
provided.
| [
{
"created": "Tue, 8 Sep 2015 15:13:12 GMT",
"version": "v1"
},
{
"created": "Tue, 22 Sep 2015 17:13:53 GMT",
"version": "v2"
}
] | 2016-02-10 | [
[
"Jadach",
"S.",
""
],
[
"Kycia",
"R. A.",
""
]
] | The effect of the photon emission (bremsstrahlung) in the cross section of the process of direct production of the Higgs boson in the future high luminosity electron and muon colliders is calculated. It was found that cross section at the top of the Higgs boson resonance peak is reduced by factor 0.347 for the electron collider and 0.548 for the muon collider. Machine spread of the centre of the mass energy of 4.2MeV (equal to the Higgs width) would reduce peak cross section further, by factor 0.170 and 0.256 (QED and energy spread) for electron and muon beams respectively. Possible uncertainties in the resummed QED calculations are discussed. Numerical results for the lineshape cross section including QED and many values of the machine energy spread are provided. |
1206.2296 | Paolo Gambino | Paolo Gambino, Thomas Mannel and Nikolai Uraltsev | B-> D* zero-recoil formfactor and the heavy quark expansion in QCD: a
systematic study | 70 pages, 13 figures | null | 10.1007/JHEP10(2012)169 | SI-HEP-2011-15; UND-HEP-12-BIG10 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present a QCD analysis of heavy quark mesons focussing on the B -> D*
formfactor at zero recoil, F_D*(1). An advanced treatment of the perturbative
corrections in the Wilsonian approach is presented. We estimate the
higher-order power corrections to the OPE sum rule and describe a refined
analysis of the nonresonant continuum contribution. In the framework of a
model-independent approach, we show that the inelastic contribution in the
phenomenological part of the OPE is related to the mQ-dependence of the
hyperfine splitting and conclude that the former is large, lowering the
prediction for F_D*(1) down to about 0.86. This likewise implies an enhanced
yield of radial and D-wave charm excitations in semileptonic B decays and
alleviates the problem with the inclusive yield of the wide excited states. We
also apply the approach to the expectation values of dimension 7 and 8 local
operators and to a few other issues in the heavy quark expansion.
| [
{
"created": "Mon, 11 Jun 2012 17:32:50 GMT",
"version": "v1"
}
] | 2015-06-05 | [
[
"Gambino",
"Paolo",
""
],
[
"Mannel",
"Thomas",
""
],
[
"Uraltsev",
"Nikolai",
""
]
] | We present a QCD analysis of heavy quark mesons focussing on the B -> D* formfactor at zero recoil, F_D*(1). An advanced treatment of the perturbative corrections in the Wilsonian approach is presented. We estimate the higher-order power corrections to the OPE sum rule and describe a refined analysis of the nonresonant continuum contribution. In the framework of a model-independent approach, we show that the inelastic contribution in the phenomenological part of the OPE is related to the mQ-dependence of the hyperfine splitting and conclude that the former is large, lowering the prediction for F_D*(1) down to about 0.86. This likewise implies an enhanced yield of radial and D-wave charm excitations in semileptonic B decays and alleviates the problem with the inclusive yield of the wide excited states. We also apply the approach to the expectation values of dimension 7 and 8 local operators and to a few other issues in the heavy quark expansion. |
hep-ph/0002059 | Virendra Gupta | V. Gupta | A new approach to the parametrization of the Cabibbo-Kobayashi-Maskawa
matrix | 8 pages, latex, no figures | Int.J.Mod.Phys.A16:1645,2001 | 10.1142/S0217751X01003603 | null | hep-ph | null | The CKM-matrix V is written as a linear combination of the unit matrix I and
a matrix U which causes intergenerational-mixing. It is shown that such a V
results from a class of quark-mass matrices. The matrix U has to be hermitian
and unitary and therefore can depend at most on 4 real parameters. The
available data on the CKM-matrix including CP-violation can be reproduced by
$V=(I+iU)/\sqrt{2}$. This is also true for the special case when U depends on
\textit{only 2 real parameters}. There is no CP-violating phase in this
parametrization. Also, for such a V the invariant phase $\Phi \equiv \phi
_{12}+\phi_{23}-\phi_{13}$, satisfies a criterion suggested for `maximal'
CP-violation.
| [
{
"created": "Fri, 4 Feb 2000 21:56:04 GMT",
"version": "v1"
}
] | 2010-11-23 | [
[
"Gupta",
"V.",
""
]
] | The CKM-matrix V is written as a linear combination of the unit matrix I and a matrix U which causes intergenerational-mixing. It is shown that such a V results from a class of quark-mass matrices. The matrix U has to be hermitian and unitary and therefore can depend at most on 4 real parameters. The available data on the CKM-matrix including CP-violation can be reproduced by $V=(I+iU)/\sqrt{2}$. This is also true for the special case when U depends on \textit{only 2 real parameters}. There is no CP-violating phase in this parametrization. Also, for such a V the invariant phase $\Phi \equiv \phi _{12}+\phi_{23}-\phi_{13}$, satisfies a criterion suggested for `maximal' CP-violation. |
1609.08922 | Daniel Are\'an | Daniel Arean, Ioannis Iatrakis, Matti Jarvinen, Elias Kiritsis | The CP-odd sector and $\theta$ dynamics in holographic QCD | 58 pages plus appendices, 19 figures. V2: section 3.1 improved, typos
corrected, published version | Phys. Rev. D 96, 026001 (2017) | 10.1103/PhysRevD.96.026001 | CCQCN-2016-151, CCTP-2016-8, MPP-2016-167 | hep-ph hep-lat hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The holographic model of V-QCD is used to analyze the physics of QCD in the
Veneziano large-N limit. An unprecedented analysis of the CP-odd physics is
performed going beyond the level of effective field theories. The structure of
holographic saddle-points at finite $\theta$ is determined, as well as its
interplay with chiral symmetry breaking. Many observables (vacuum energy and
higher-order susceptibilities, singlet and non-singlet masses and mixings) are
computed as functions of $\theta$ and the quark mass $m$. Wherever applicable
the results are compared to those of chiral Lagrangians, finding agreement. In
particular, we recover the Witten-Veneziano formula in the small $x\to 0$
limit, we compute the $\theta$-dependence of the pion mass and we derive the
hyperscaling relation for the topological susceptibility in the conformal
window in terms of the quark mass.
| [
{
"created": "Wed, 28 Sep 2016 14:18:03 GMT",
"version": "v1"
},
{
"created": "Tue, 26 Sep 2017 14:27:18 GMT",
"version": "v2"
}
] | 2017-09-27 | [
[
"Arean",
"Daniel",
""
],
[
"Iatrakis",
"Ioannis",
""
],
[
"Jarvinen",
"Matti",
""
],
[
"Kiritsis",
"Elias",
""
]
] | The holographic model of V-QCD is used to analyze the physics of QCD in the Veneziano large-N limit. An unprecedented analysis of the CP-odd physics is performed going beyond the level of effective field theories. The structure of holographic saddle-points at finite $\theta$ is determined, as well as its interplay with chiral symmetry breaking. Many observables (vacuum energy and higher-order susceptibilities, singlet and non-singlet masses and mixings) are computed as functions of $\theta$ and the quark mass $m$. Wherever applicable the results are compared to those of chiral Lagrangians, finding agreement. In particular, we recover the Witten-Veneziano formula in the small $x\to 0$ limit, we compute the $\theta$-dependence of the pion mass and we derive the hyperscaling relation for the topological susceptibility in the conformal window in terms of the quark mass. |
2103.12089 | Matthew Sullivan | Hooman Davoudiasl, Ian M. Lewis, Matthew Sullivan | Multi-TeV Signals of Baryogenesis in Higgs Troika Model | v3: EDM estimate revised; conclusions unchanged | Phys. Rev. D 104, 015024 (2021) | 10.1103/PhysRevD.104.015024 | null | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A modest extension of the Standard Model by two additional Higgs doublets -
the Higgs Troika Model - can provide a well-motivated scenario for successful
baryogenesis if neutrinos are Dirac fermions. Adapting the "Spontaneous Flavor
Violation" framework, we consider a version of the Troika model where light
quarks have significant couplings to the new multi-TeV Higgs states. Resonant
production of new scalars leading to di-jet or top-pair signals are typical
predictions of this setup. The initial and final state quarks relevant to the
collider phenomenology also play a key role in baryogenesis, potentially
providing direct access to the relevant early Universe physics in high energy
experiments. Viable baryogenesis generally prefers some hierarchy of masses
between the observed and the postulated Higgs states. We show that there is a
complementarity between direct searches at a future 100 TeV $pp$ collider and
indirect searches at flavor experiments, with both sensitive to different
regions of parameter space relevant for baryogenesis. In particular,
measurements of $D-\bar{D}$ mixing at LHCb probe much of the interesting
parameter space. Direct and indirect searches can uncover the new Higgs states
up to masses of $\mathcal{O}(10)$ TeV, thereby providing an impressive reach to
investigate this model.
| [
{
"created": "Mon, 22 Mar 2021 18:00:09 GMT",
"version": "v1"
},
{
"created": "Fri, 30 Jul 2021 18:06:13 GMT",
"version": "v2"
},
{
"created": "Fri, 25 Feb 2022 21:55:36 GMT",
"version": "v3"
}
] | 2022-03-01 | [
[
"Davoudiasl",
"Hooman",
""
],
[
"Lewis",
"Ian M.",
""
],
[
"Sullivan",
"Matthew",
""
]
] | A modest extension of the Standard Model by two additional Higgs doublets - the Higgs Troika Model - can provide a well-motivated scenario for successful baryogenesis if neutrinos are Dirac fermions. Adapting the "Spontaneous Flavor Violation" framework, we consider a version of the Troika model where light quarks have significant couplings to the new multi-TeV Higgs states. Resonant production of new scalars leading to di-jet or top-pair signals are typical predictions of this setup. The initial and final state quarks relevant to the collider phenomenology also play a key role in baryogenesis, potentially providing direct access to the relevant early Universe physics in high energy experiments. Viable baryogenesis generally prefers some hierarchy of masses between the observed and the postulated Higgs states. We show that there is a complementarity between direct searches at a future 100 TeV $pp$ collider and indirect searches at flavor experiments, with both sensitive to different regions of parameter space relevant for baryogenesis. In particular, measurements of $D-\bar{D}$ mixing at LHCb probe much of the interesting parameter space. Direct and indirect searches can uncover the new Higgs states up to masses of $\mathcal{O}(10)$ TeV, thereby providing an impressive reach to investigate this model. |
2008.07959 | Li-Sheng Geng | Yin Huang, Jun-Xu Lu, Ju-Jun Xie, and Li-Sheng Geng | Strong decays of $\bar{D}^{*}K^{*}$ molecules and the newly observed
$X_{0,1}$ states | 5 pages, 2 figures | null | 10.1140/epjc/s10052-020-08516-4 | null | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Lately, the LHCb Collaboration reported the discovery of two new states in
the $B^+\rightarrow D^+D^- K^+$ decay, i.e., $X_0(2866)$ and $X_1(2904)$. In
the present work, we study whether these states can be understood as
$D^*\bar{K}^*$ molecules from the perspective of their two-body strong decays
into $D^-K^+$ via triangle diagrams and three-body decays into $D^*\bar{K}\pi$.
The coupling of the two states to $D^*\bar{K}^*$ are determined from the
Weinberg compositeness condition, while the other relevant couplings are well
known. The obtained strong decay width for the $X_0(2866)$, in marginal
agreement with the experimental value within the uncertainty of the model,
hints at a large $D^*\bar{K}^*$ component in its wave function. On the other
hand, the strong decay width for the $X_1(2904)$, much smaller than its
experimental counterpart, effectively rules out its assignment as a
$D^*\bar{K}^*$ molecule.
| [
{
"created": "Tue, 18 Aug 2020 14:42:58 GMT",
"version": "v1"
}
] | 2020-12-02 | [
[
"Huang",
"Yin",
""
],
[
"Lu",
"Jun-Xu",
""
],
[
"Xie",
"Ju-Jun",
""
],
[
"Geng",
"Li-Sheng",
""
]
] | Lately, the LHCb Collaboration reported the discovery of two new states in the $B^+\rightarrow D^+D^- K^+$ decay, i.e., $X_0(2866)$ and $X_1(2904)$. In the present work, we study whether these states can be understood as $D^*\bar{K}^*$ molecules from the perspective of their two-body strong decays into $D^-K^+$ via triangle diagrams and three-body decays into $D^*\bar{K}\pi$. The coupling of the two states to $D^*\bar{K}^*$ are determined from the Weinberg compositeness condition, while the other relevant couplings are well known. The obtained strong decay width for the $X_0(2866)$, in marginal agreement with the experimental value within the uncertainty of the model, hints at a large $D^*\bar{K}^*$ component in its wave function. On the other hand, the strong decay width for the $X_1(2904)$, much smaller than its experimental counterpart, effectively rules out its assignment as a $D^*\bar{K}^*$ molecule. |
0708.2007 | Elsayed Lashin Dr. | H. A. Alhendi, E. I. Lashin and A. A. Mudlej | Textures with two traceless submatrices of the neutrino mass matrix | 17 pages, 3 figures and 2 tables, Minor typos are corrected | Phys.Rev.D77:013009,2008 | 10.1103/PhysRevD.77.013009 | null | hep-ph | null | We propose a new texture for the light neutrino mass matrix. The proposal is
based upon imposing zero-trace condition on the two by two sub-matrices of the
complex symmetric Majorana mass matrix in the flavor basis where the charged
lepton mass matrix is diagonal. Restricting the mass matrix to have two
traceless sub-matrices may be found sufficient to describe the current data.
Eight out of fifteen independent possible cases are found to be compatible with
current data. Numerical and some approximate analytical results are presented.
| [
{
"created": "Wed, 15 Aug 2007 10:53:06 GMT",
"version": "v1"
},
{
"created": "Wed, 27 Feb 2008 21:50:24 GMT",
"version": "v2"
}
] | 2008-11-26 | [
[
"Alhendi",
"H. A.",
""
],
[
"Lashin",
"E. I.",
""
],
[
"Mudlej",
"A. A.",
""
]
] | We propose a new texture for the light neutrino mass matrix. The proposal is based upon imposing zero-trace condition on the two by two sub-matrices of the complex symmetric Majorana mass matrix in the flavor basis where the charged lepton mass matrix is diagonal. Restricting the mass matrix to have two traceless sub-matrices may be found sufficient to describe the current data. Eight out of fifteen independent possible cases are found to be compatible with current data. Numerical and some approximate analytical results are presented. |
1808.04634 | Tianjun Li | Tianjun Li | The Generalized Abelian and Non-Abelian Gauge Theories and their
Particle Physics Applications | 5 pages | null | null | null | hep-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Gauge theory is the foundation of the particle physics Standard Model (SM).
Considering the multiple gauge sectors for one gauge transformation, we study
the generalized Abelian and non-Abelian (Yang-Mills theory) gauge theories. We
first point out that the U(1) gauge theory has a few unique properties, which
provide the motivations for the generalized Yang-Mills theory. Also, we
consider the generalized Abelian gauge theory, and study the Higgs mechanism
with new interesting properties. In addition, we propose the simple and generic
generalizations of Yang-Mills theory. In the simple generalization, we realize
two specific properties in the Abelian gauge theory. For applications in
particle physics, we propose the invisible axion model with TeV-scale
Peceei-Quinn symmetry breaking. We can solve the strong CP problem, and obtain
the effective decay constant around the intermediate scale. Moreover, we study
the SM electroweak symmetry breaking induced from the symmetry breaking in the
other gauge Sector. In particular, we can easily obtain the strong first order
electroweak phase transition in the SM, which is important for electroweak
baryogenesis and gravitational wave.
| [
{
"created": "Tue, 14 Aug 2018 11:32:41 GMT",
"version": "v1"
}
] | 2018-08-15 | [
[
"Li",
"Tianjun",
""
]
] | Gauge theory is the foundation of the particle physics Standard Model (SM). Considering the multiple gauge sectors for one gauge transformation, we study the generalized Abelian and non-Abelian (Yang-Mills theory) gauge theories. We first point out that the U(1) gauge theory has a few unique properties, which provide the motivations for the generalized Yang-Mills theory. Also, we consider the generalized Abelian gauge theory, and study the Higgs mechanism with new interesting properties. In addition, we propose the simple and generic generalizations of Yang-Mills theory. In the simple generalization, we realize two specific properties in the Abelian gauge theory. For applications in particle physics, we propose the invisible axion model with TeV-scale Peceei-Quinn symmetry breaking. We can solve the strong CP problem, and obtain the effective decay constant around the intermediate scale. Moreover, we study the SM electroweak symmetry breaking induced from the symmetry breaking in the other gauge Sector. In particular, we can easily obtain the strong first order electroweak phase transition in the SM, which is important for electroweak baryogenesis and gravitational wave. |
2309.00054 | Andreas Von Manteuffel | Roman N. Lee, Andreas von Manteuffel, Robert M. Schabinger, Alexander
V. Smirnov, Vladimir A. Smirnov, Matthias Steinhauser | Master Integrals for Four-Loop Massless Form Factors | 17 pages, 3 figures, files with analytical results at
https://www.ttp.kit.edu/preprints/2023/ttp23-034/ | null | null | MSUHEP-23-023, P3H-23-057, TTP23-034 | hep-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present analytical results for all master integrals for massless
three-point functions, with one off-shell leg, at four loops. Our solutions
were obtained using differential equations and direct integration techniques.
We review the methods and provide additional details.
| [
{
"created": "Thu, 31 Aug 2023 18:00:45 GMT",
"version": "v1"
}
] | 2023-09-04 | [
[
"Lee",
"Roman N.",
""
],
[
"von Manteuffel",
"Andreas",
""
],
[
"Schabinger",
"Robert M.",
""
],
[
"Smirnov",
"Alexander V.",
""
],
[
"Smirnov",
"Vladimir A.",
""
],
[
"Steinhauser",
"Matthias",
""
]
] | We present analytical results for all master integrals for massless three-point functions, with one off-shell leg, at four loops. Our solutions were obtained using differential equations and direct integration techniques. We review the methods and provide additional details. |
hep-ph/9708476 | David London | David London | New Physics and the Unitarity Triangle | 8 pages, Latex, requires aipproc.sty (included), 1 PS figure
(included) | null | 10.1063/1.55105 | UdeM-GPP-TH-97-44 | hep-ph | null | After reviewing the present experimental constraints on the unitarity
triangle, I discuss the various ways in which new physics can manifest itself
in measurements of the parameters of the unitarity triangle. Apart from one
exception, which I describe, new physics enters principally through new
contributions to B0-B0(bar) mixing. Different models of new physics can be
partially distinguished by looking at their effects on rare, flavour-changing
$B$ penguin decays. (Invited talk given at the Symposium Twenty Beautiful Years
of Bottom Physics, Chicago, IL, USA, June 29 -- July 2, 1997.)
| [
{
"created": "Wed, 27 Aug 1997 16:12:25 GMT",
"version": "v1"
}
] | 2009-10-30 | [
[
"London",
"David",
""
]
] | After reviewing the present experimental constraints on the unitarity triangle, I discuss the various ways in which new physics can manifest itself in measurements of the parameters of the unitarity triangle. Apart from one exception, which I describe, new physics enters principally through new contributions to B0-B0(bar) mixing. Different models of new physics can be partially distinguished by looking at their effects on rare, flavour-changing $B$ penguin decays. (Invited talk given at the Symposium Twenty Beautiful Years of Bottom Physics, Chicago, IL, USA, June 29 -- July 2, 1997.) |
hep-ph/0403155 | V. V. Sinev | G. Domogatski, V. Kopeikin, L. Mikaelyan, V. Sinev | Inverse beta decay reaction in $^{232}$Th and $^{233}$U fission
antineutrino flux | 6 pages in LaTeX and 2 ps figures. Submitted to Physics of Atomic
Nuclei | Phys.Atom.Nucl.68:234-236,2005; Yad.Fiz.68:259-261,2005 | 10.1134/1.1866378 | null | hep-ph | null | Energy spectra of antineutrinos coming from $^{232}$Th and $^{233}$U
neutron-induced fission are calculated, relevant inverse beta decay
$\bar{{\nu}_e}+p \to n + e^{+}$ positron spectra and total cross sections are
found. This study is stimulated by a hypothesis that a self-sustained nuclear
chain reaction is burning at the center of the Earth ("Georeactor"). The
Georeactor, according to the author of this idea, provides energy necessary to
sustain the Earth's magnetic field. The Georeactor's nuclear fuel is $^{235}$U
and, probably, $^{232}$Th and $^{233}$U. Results of present study may appear to
be useful in future experiments aimed to test the Georector hypothesis and to
estimate its fuel components as a part of developments in geophysics and
astrophysics based on observations of low energy antineutrinos in Nature.
| [
{
"created": "Mon, 15 Mar 2004 08:14:32 GMT",
"version": "v1"
},
{
"created": "Wed, 17 Mar 2004 06:54:26 GMT",
"version": "v2"
}
] | 2008-11-26 | [
[
"Domogatski",
"G.",
""
],
[
"Kopeikin",
"V.",
""
],
[
"Mikaelyan",
"L.",
""
],
[
"Sinev",
"V.",
""
]
] | Energy spectra of antineutrinos coming from $^{232}$Th and $^{233}$U neutron-induced fission are calculated, relevant inverse beta decay $\bar{{\nu}_e}+p \to n + e^{+}$ positron spectra and total cross sections are found. This study is stimulated by a hypothesis that a self-sustained nuclear chain reaction is burning at the center of the Earth ("Georeactor"). The Georeactor, according to the author of this idea, provides energy necessary to sustain the Earth's magnetic field. The Georeactor's nuclear fuel is $^{235}$U and, probably, $^{232}$Th and $^{233}$U. Results of present study may appear to be useful in future experiments aimed to test the Georector hypothesis and to estimate its fuel components as a part of developments in geophysics and astrophysics based on observations of low energy antineutrinos in Nature. |
hep-ph/0502105 | John F. Gunion | Radovan Dermisek and John F. Gunion | Escaping the Large Fine Tuning and Little Hierarchy Problems in the Next
to Minimal Supersymmetric Model and h-> aa Decays | 4 pages, 4 figures, revised to conform with PRL published version | Phys.Rev.Lett.95:041801,2005 | 10.1103/PhysRevLett.95.041801 | null | hep-ph hep-ex | null | We demonstrate that the NMSSM can have small fine tuning and modest light
stop mass while still evading all experimental constraints. For small tan(beta)
[large tan(beta)], the relevant scenarios are such that there is always (often)
a SM-like Higgs boson that decays to two lighter -- possibly much lighter --
pseudoscalar Higgses.
| [
{
"created": "Fri, 11 Feb 2005 01:35:06 GMT",
"version": "v1"
},
{
"created": "Thu, 14 Jul 2005 17:09:59 GMT",
"version": "v2"
}
] | 2014-11-18 | [
[
"Dermisek",
"Radovan",
""
],
[
"Gunion",
"John F.",
""
]
] | We demonstrate that the NMSSM can have small fine tuning and modest light stop mass while still evading all experimental constraints. For small tan(beta) [large tan(beta)], the relevant scenarios are such that there is always (often) a SM-like Higgs boson that decays to two lighter -- possibly much lighter -- pseudoscalar Higgses. |
hep-ph/9908491 | Kaustubh Agashe | Kaustubh Agashe (UC Berkeley and LBNL) | Naturalness and Supersymmetry | LaTeX, 154 pages, figures. Ph.D. thesis (UC Berkeley, May 1998) | null | null | LBNL-41874 | hep-ph | null | Supersymmetry solves the gauge hierarchy problem of the Standard Model if the
masses of supersymmetric partners of the SM particles are close to the weak
scale. In this thesis, we argue that the supersymmetric Standard Model, while
avoiding the fine tuning in electroweak symmetry breaking, requires
unnaturalness/fine tuning in some (other) sector of the theory. For example,
Baryon and Lepton number violating operators are allowed which lead to proton
decay and flavor changing neutral currents. We study some of the constraints
from the latter in this thesis. We have to impose an R-parity for the theory to
be both natural and viable. In the absence of flavor symmetries, the
supersymmetry breaking masses for the squarks and sleptons lead to too large
flavor changing neutral currents. We show that two of the solutions to this
problem, gauge mediation of supersymmetry breaking and making the scalars of
the first two generations heavier than a few TeV, reintroduce fine tuning in
electroweak symmetry breaking. We also construct a model of low energy gauge
mediation with a non-minimal messenger sector which improves the fine tuning
and also generates required Higgs mass terms. We show that this model can be
derived from a Grand Unified Theory despite the non-minimal spectrum.
| [
{
"created": "Fri, 27 Aug 1999 22:55:10 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Agashe",
"Kaustubh",
"",
"UC Berkeley and LBNL"
]
] | Supersymmetry solves the gauge hierarchy problem of the Standard Model if the masses of supersymmetric partners of the SM particles are close to the weak scale. In this thesis, we argue that the supersymmetric Standard Model, while avoiding the fine tuning in electroweak symmetry breaking, requires unnaturalness/fine tuning in some (other) sector of the theory. For example, Baryon and Lepton number violating operators are allowed which lead to proton decay and flavor changing neutral currents. We study some of the constraints from the latter in this thesis. We have to impose an R-parity for the theory to be both natural and viable. In the absence of flavor symmetries, the supersymmetry breaking masses for the squarks and sleptons lead to too large flavor changing neutral currents. We show that two of the solutions to this problem, gauge mediation of supersymmetry breaking and making the scalars of the first two generations heavier than a few TeV, reintroduce fine tuning in electroweak symmetry breaking. We also construct a model of low energy gauge mediation with a non-minimal messenger sector which improves the fine tuning and also generates required Higgs mass terms. We show that this model can be derived from a Grand Unified Theory despite the non-minimal spectrum. |
hep-ph/0204127 | Xiaomin Zu | John C. Collins, Xiaomin Zu | Parton Distribution Functions suitable for Monte-Carlo event generators | References corrected. Added reference | JHEP 0206 (2002) 018 | 10.1088/1126-6708/2002/06/018 | null | hep-ph | null | In the usual factorization theorems, which give predictions only for
inclusive cross sections, there is considerable freedom in the choice of the
scheme to define the parton distribution functions. These theorems do not
directly apply to Monte-Carlo event generators, and more general factorization
theorems which give predictions for fully exclusive cross sections are needed.
It has been shown that appropriate parton distribution functions are uniquely
defined by the showering algorithm. In this paper, we present results of
calculations of the Monte-Carlo parton distribution functions in terms of the
commonly used MSbar parton distribution functions. At small x the differences
are large, which demonstrates the importance of using the correct parton
distribution functions in an event generator rather than MSbar parton
distribution functions. We present some simple approximations that enable an
understanding of the sizes of the results to be obtained.
| [
{
"created": "Thu, 11 Apr 2002 15:57:05 GMT",
"version": "v1"
},
{
"created": "Sun, 14 Apr 2002 20:39:01 GMT",
"version": "v2"
},
{
"created": "Mon, 3 Jun 2002 19:58:34 GMT",
"version": "v3"
},
{
"created": "Thu, 13 Jun 2002 13:29:43 GMT",
"version": "v4"
}
] | 2009-11-07 | [
[
"Collins",
"John C.",
""
],
[
"Zu",
"Xiaomin",
""
]
] | In the usual factorization theorems, which give predictions only for inclusive cross sections, there is considerable freedom in the choice of the scheme to define the parton distribution functions. These theorems do not directly apply to Monte-Carlo event generators, and more general factorization theorems which give predictions for fully exclusive cross sections are needed. It has been shown that appropriate parton distribution functions are uniquely defined by the showering algorithm. In this paper, we present results of calculations of the Monte-Carlo parton distribution functions in terms of the commonly used MSbar parton distribution functions. At small x the differences are large, which demonstrates the importance of using the correct parton distribution functions in an event generator rather than MSbar parton distribution functions. We present some simple approximations that enable an understanding of the sizes of the results to be obtained. |
2111.10879 | Holger Frits Bech Nielsen | C. D. Froggatt (Glasgow University), H.B.Nielsen (Niels Bohr
Institute) | Atomic Size Dark Matter Pearls, Electron Signal | Proceeding contribution to the 24th Workshop "What Comes Beyond the
Standard Models'', Bled, July 3.-- 11., 2021 H.B. Nielsen gave the talk | null | null | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We explain both the observation of dark matter by the seasonal variation of
the DAMA-LIBRA data and the observation of ``electron recoil'' events at
Xenon1T by the SAME dark matter model. This DM is bubbles of a new type of
vacuum containing ordinary atomic matter under high pressure ensured by the
surface tension of the domain wall. Surrounding it a cloud of electrons almost
of atomic size. Also we explain the self interactions of dark matter suggested
by astronomical studies of dwarf galaxies etc. Interaction in the shielding
slows the dark matter down to a low terminal velocity. Nuclei in the
underground detectors are thus not detected. Further we explain the
``mysterious'' X-ray line of 3.5 keV from our dark matter particles colliding
with each other so that the surfaces/skins unite. Even the 3.5 keV X-ray
radiation from the Tycho supernova remnant is explained as our pearls hitting
cosmic rays in the remnant. DAMA-LIBRA and Xenon1T experiments see supposedly
our dark matter pearls excited during their stopping in the shielding or the
air. The most remarkable support for our type of model is that both these
underground experiments see events with about 3.5 keV energy, just the energy
of the X-ray line. We get a good numerical understanding of the fitted cross
section over mass ratio of self interacting dark matter observed in the study
of dwarf galaxies. Also the total energy of the dark matter pearls stopped in
the shield is reasonably matching order of magnitudewise with the absolute
observation rates of DAMA-LIBRA and Xenon1T, although the their ratio requires
further development. Accepting that the different phases of the vacuum could be
realized inside the Standard Model, our whole scheme also could. No new physics
is needed for dark matter!
| [
{
"created": "Sun, 21 Nov 2021 19:11:12 GMT",
"version": "v1"
}
] | 2021-11-23 | [
[
"Froggatt",
"C. D.",
"",
"Glasgow University"
],
[
"Nielsen",
"H. B.",
"",
"Niels Bohr\n Institute"
]
] | We explain both the observation of dark matter by the seasonal variation of the DAMA-LIBRA data and the observation of ``electron recoil'' events at Xenon1T by the SAME dark matter model. This DM is bubbles of a new type of vacuum containing ordinary atomic matter under high pressure ensured by the surface tension of the domain wall. Surrounding it a cloud of electrons almost of atomic size. Also we explain the self interactions of dark matter suggested by astronomical studies of dwarf galaxies etc. Interaction in the shielding slows the dark matter down to a low terminal velocity. Nuclei in the underground detectors are thus not detected. Further we explain the ``mysterious'' X-ray line of 3.5 keV from our dark matter particles colliding with each other so that the surfaces/skins unite. Even the 3.5 keV X-ray radiation from the Tycho supernova remnant is explained as our pearls hitting cosmic rays in the remnant. DAMA-LIBRA and Xenon1T experiments see supposedly our dark matter pearls excited during their stopping in the shielding or the air. The most remarkable support for our type of model is that both these underground experiments see events with about 3.5 keV energy, just the energy of the X-ray line. We get a good numerical understanding of the fitted cross section over mass ratio of self interacting dark matter observed in the study of dwarf galaxies. Also the total energy of the dark matter pearls stopped in the shield is reasonably matching order of magnitudewise with the absolute observation rates of DAMA-LIBRA and Xenon1T, although the their ratio requires further development. Accepting that the different phases of the vacuum could be realized inside the Standard Model, our whole scheme also could. No new physics is needed for dark matter! |
1801.03059 | Pankaj Saha | Debaprasad Maity and Pankaj Saha | Connecting CMB anisotropy and cold dark matter phenomenology via
reheating | Added discussions, matches published version | Phys. Rev. D 98, 103525 (2018) | 10.1103/PhysRevD.98.103525 | null | hep-ph gr-qc | http://creativecommons.org/licenses/by/4.0/ | Understanding the properties of dark matter has proved to be one of the most
challenging problems of particle phenomenology. In this paper, we have tried to
understand the phenomenology of dark matter in light of very well understood
properties of cosmic microwave background (CMB) anisotropy. To connect these
two, inflation and its subsequent evolution known as the reheating phase play
the important role. Following the previous analysis, we first established a
one-to-one correspondence between the CMB power spectrum and the reheating
temperature assuming the perturbative reheating scenario. Further by
incorporating a possible dark matter candidate through the radiation
annihilation process during reheating and the current value of dark matter
abundance, we constrain the dark matter parameter space through the
inflationary power spectrum for different inflationary models.
| [
{
"created": "Tue, 9 Jan 2018 17:51:34 GMT",
"version": "v1"
},
{
"created": "Tue, 27 Feb 2018 13:36:08 GMT",
"version": "v2"
},
{
"created": "Tue, 27 Nov 2018 17:51:33 GMT",
"version": "v3"
}
] | 2018-11-28 | [
[
"Maity",
"Debaprasad",
""
],
[
"Saha",
"Pankaj",
""
]
] | Understanding the properties of dark matter has proved to be one of the most challenging problems of particle phenomenology. In this paper, we have tried to understand the phenomenology of dark matter in light of very well understood properties of cosmic microwave background (CMB) anisotropy. To connect these two, inflation and its subsequent evolution known as the reheating phase play the important role. Following the previous analysis, we first established a one-to-one correspondence between the CMB power spectrum and the reheating temperature assuming the perturbative reheating scenario. Further by incorporating a possible dark matter candidate through the radiation annihilation process during reheating and the current value of dark matter abundance, we constrain the dark matter parameter space through the inflationary power spectrum for different inflationary models. |
hep-ph/0304293 | Toshifumi Yamashita | Nobuhiro Maekawa and Toshifumi Yamashita | Flipped SO(10) model | 12 pages, examples are corrected | Phys.Lett. B567 (2003) 330-338 | 10.1016/j.physletb.2003.06.054 | KUNS-1840 | hep-ph | null | We show that as in the flipped SU(5) models, doublet-triplet splitting is
realized by the missing partner mechanism in the flipped SO(10) models. The
gauge group $SO(10)_F\times U(1)_{V'_F}$ includes $SU(2)_E$ gauge symmetry,
that plays an important role in solving supersymmetric flavor problem by
introducing non-abelian horizontal gauge symmetry and anomalous $U(1)_A$ gauge
symmetry. The gauge group can be broken into the standard model gauge group by
VEVs of only spinor fields, such models may be easier than $E_6$ models to be
derived from the superstring theory.
| [
{
"created": "Wed, 30 Apr 2003 15:02:57 GMT",
"version": "v1"
},
{
"created": "Tue, 6 May 2003 14:46:43 GMT",
"version": "v2"
}
] | 2009-11-10 | [
[
"Maekawa",
"Nobuhiro",
""
],
[
"Yamashita",
"Toshifumi",
""
]
] | We show that as in the flipped SU(5) models, doublet-triplet splitting is realized by the missing partner mechanism in the flipped SO(10) models. The gauge group $SO(10)_F\times U(1)_{V'_F}$ includes $SU(2)_E$ gauge symmetry, that plays an important role in solving supersymmetric flavor problem by introducing non-abelian horizontal gauge symmetry and anomalous $U(1)_A$ gauge symmetry. The gauge group can be broken into the standard model gauge group by VEVs of only spinor fields, such models may be easier than $E_6$ models to be derived from the superstring theory. |
2202.00996 | Daniel Locke | Alexander Belyaev, Giacomo Cacciapaglia, Daniel Locke | Minimal Consistent models for systematic Dark Matter exploration | 10 pages, 3 figures, contribution to 55th Rencontres de Moriond on
QCD and High Energy Interactions (Moriond QCD 2021)(C21-03-27), March
27-April 3, 2021 | null | null | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Dark Matter searches in collider and non-collider experiments requires
systematic and consistent approach. We suggest and perform classification of
Minimal Consistent Dark Matter models which are aimed to create a solid
framework for Dark Matter exploration.
| [
{
"created": "Wed, 2 Feb 2022 12:30:56 GMT",
"version": "v1"
},
{
"created": "Thu, 3 Feb 2022 09:45:06 GMT",
"version": "v2"
}
] | 2022-02-04 | [
[
"Belyaev",
"Alexander",
""
],
[
"Cacciapaglia",
"Giacomo",
""
],
[
"Locke",
"Daniel",
""
]
] | Dark Matter searches in collider and non-collider experiments requires systematic and consistent approach. We suggest and perform classification of Minimal Consistent Dark Matter models which are aimed to create a solid framework for Dark Matter exploration. |
hep-ph/0512076 | Peihong Gu | Pei-Hong Gu, Xiao-Jun Bi, Bo Feng, Bing-Lin Young, and Xinmin Zhang | Detecting dark energy in long baseline neutrino oscillations | 9 pages, 6 figures | Chin.Phys.C32:530-535,2008 | 10.1088/1674-1137/32/7/004 | BIHEP-TH-2005-16, RESCEU-38/05 | hep-ph | null | In this paper, we discuss a possibility of studying properties of dark energy
in long baseline neutrino oscillation experiments. We consider two types of
models of neutrino dark energy. For one type of models the scalar field is
taken to be quintessence-like and for the other phantom-like. In these models
the scalar fields couple to the neutrinos to give rise to a spatially varying
neutrino masses. We will show that the two types of models predict different
behaviors of the spatial variation of the neutrino masses inside Earth and
consequently result in different signals in long baseline neutrino oscillation
experiments.
| [
{
"created": "Tue, 6 Dec 2005 14:48:01 GMT",
"version": "v1"
}
] | 2011-08-31 | [
[
"Gu",
"Pei-Hong",
""
],
[
"Bi",
"Xiao-Jun",
""
],
[
"Feng",
"Bo",
""
],
[
"Young",
"Bing-Lin",
""
],
[
"Zhang",
"Xinmin",
""
]
] | In this paper, we discuss a possibility of studying properties of dark energy in long baseline neutrino oscillation experiments. We consider two types of models of neutrino dark energy. For one type of models the scalar field is taken to be quintessence-like and for the other phantom-like. In these models the scalar fields couple to the neutrinos to give rise to a spatially varying neutrino masses. We will show that the two types of models predict different behaviors of the spatial variation of the neutrino masses inside Earth and consequently result in different signals in long baseline neutrino oscillation experiments. |
hep-ph/9808259 | Uma Mahanta | Uma Mahanta | Probing the SUSY breaking scale at an $e^-e^-$ collider | Plain Tex, 7 pages, No figures | Phys.Rev. D59 (1999) 035006 | 10.1103/PhysRevD.59.035006 | MRI-PHY/980812 | hep-ph | null | If supersymmetry is spontaneously at a low energy scale then the resulting
gravitino would be very light. The interaction strength of the longitudinal
components of such a light gravitino to electron-selectron pair then becomes
comparable to that of electroweak interactions. Such a light gravitino could
modify the cross-section for $e^_L e^_R-->\tilde {e}_L\tilde {e}_R$ from its
MSSM value. Precision measurement of this cross-section could therefore be used
to probe the low energy SUSY breaking scale.
| [
{
"created": "Fri, 7 Aug 1998 12:20:22 GMT",
"version": "v1"
}
] | 2009-10-31 | [
[
"Mahanta",
"Uma",
""
]
] | If supersymmetry is spontaneously at a low energy scale then the resulting gravitino would be very light. The interaction strength of the longitudinal components of such a light gravitino to electron-selectron pair then becomes comparable to that of electroweak interactions. Such a light gravitino could modify the cross-section for $e^_L e^_R-->\tilde {e}_L\tilde {e}_R$ from its MSSM value. Precision measurement of this cross-section could therefore be used to probe the low energy SUSY breaking scale. |
0806.2531 | Alexander Manashov | V.M. Braun, A.N. Manashov and J. Rohrwild | Baryon Operators of Higher Twist in QCD and Nucleon Distribution
Amplitudes | 60 pages, 6 figures, pdflatex, typos corrected | Nucl.Phys.B807:89-137,2009 | 10.1016/j.nuclphysb.2008.08.012 | null | hep-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We develop a general theoretical framework for the description of
higher-twist baryon operators which makes maximal use of the conformal symmetry
of the QCD Lagrangian. The conformal operator basis is constructed for all
twists. The complete analysis of the one-loop renormalization of twist-4
operators is given. The evolution equation for three-quark operators of the
same chirality turns out to be completely integrable. The spectrum of anomalous
dimensions coincides in this case with the energy spectrum of the twist-4
subsector of the SU(2,2) Heisenberg spin chain. The results are applied to give
a general classification and calculate the scale dependence of subleading
twist-4 nucleon distribution amplitudes that are relevant for hard exclusive
reactions involving a helicity flip. In particular we find an all-order
expression (in conformal spin) for the contributions of geometric twist-3
operators to the (light-cone) twist-4 nucleon distribution amplitudes, which
are usually referred to as Wandzura-Wilczek terms.
| [
{
"created": "Mon, 16 Jun 2008 10:56:11 GMT",
"version": "v1"
},
{
"created": "Tue, 11 Aug 2009 16:37:51 GMT",
"version": "v2"
}
] | 2009-08-11 | [
[
"Braun",
"V. M.",
""
],
[
"Manashov",
"A. N.",
""
],
[
"Rohrwild",
"J.",
""
]
] | We develop a general theoretical framework for the description of higher-twist baryon operators which makes maximal use of the conformal symmetry of the QCD Lagrangian. The conformal operator basis is constructed for all twists. The complete analysis of the one-loop renormalization of twist-4 operators is given. The evolution equation for three-quark operators of the same chirality turns out to be completely integrable. The spectrum of anomalous dimensions coincides in this case with the energy spectrum of the twist-4 subsector of the SU(2,2) Heisenberg spin chain. The results are applied to give a general classification and calculate the scale dependence of subleading twist-4 nucleon distribution amplitudes that are relevant for hard exclusive reactions involving a helicity flip. In particular we find an all-order expression (in conformal spin) for the contributions of geometric twist-3 operators to the (light-cone) twist-4 nucleon distribution amplitudes, which are usually referred to as Wandzura-Wilczek terms. |
1709.09596 | German F. R. Sborlini | German F. R. Sborlini | Higher-order QED effects in hadronic processes | 7 pages, 2 figures. Contribution to the Proceedings of the EPS-HEP
2017 Conference | PoS(EPS-HEP2017)398 | null | null | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this presentation, we describe the computation of higher-order QED effects
relevant in hadronic collisions. In particular, we discuss the calculation of
mixed QCD-QED one-loop contributions to the Altarelli-Parisi splittings
functions, as well as the pure two-loop QED corrections. We explain how to
extend the DGLAP equations to deal with new parton distributions, emphasizing
the consequences of the novel corrections in the determination (and evolution)
of the photon distributions.
| [
{
"created": "Wed, 27 Sep 2017 15:56:57 GMT",
"version": "v1"
}
] | 2017-09-28 | [
[
"Sborlini",
"German F. R.",
""
]
] | In this presentation, we describe the computation of higher-order QED effects relevant in hadronic collisions. In particular, we discuss the calculation of mixed QCD-QED one-loop contributions to the Altarelli-Parisi splittings functions, as well as the pure two-loop QED corrections. We explain how to extend the DGLAP equations to deal with new parton distributions, emphasizing the consequences of the novel corrections in the determination (and evolution) of the photon distributions. |
0810.3142 | Defu Hou | Bo Feng, Defu Hou, and Hai-cang Ren | Angular Momentum Mixing in Single Flavor Color Superconductivity with
Transverse Pairing | 16 pages, 2 figures, 1 table in Revtex | Nucl.Phys.B813:408-429,2009 | 10.1016/j.nuclphysb.2008.12.020 | RU06-9-B | hep-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Because of the equal strength of the pairing potential mediated by one-gluon
exchange for all partial waves to the leading order QCD running coupling
constant and the nonlinearity of the gap equation, the non-spherical pairing in
single flavor color superconductivity(CSC) can not be restricted in a single
non-s-wave channel and the mixing among different angular momenta will occur.
In this paper, we examine the angular momentum mixing in single flavor CSC with
transverse pairing, in which the pairing quarks have opposite helicity. We find
that the free energy of all non-spherical pairing states are lowered by angular
momentum mixing compared with that contain p-wave only. But the amount of the
free energy drop is numerically small. Consequently the most stable pairing
state that respect the time reversal invariance remains the spherical CSL.
| [
{
"created": "Fri, 17 Oct 2008 12:29:15 GMT",
"version": "v1"
}
] | 2014-11-18 | [
[
"Feng",
"Bo",
""
],
[
"Hou",
"Defu",
""
],
[
"Ren",
"Hai-cang",
""
]
] | Because of the equal strength of the pairing potential mediated by one-gluon exchange for all partial waves to the leading order QCD running coupling constant and the nonlinearity of the gap equation, the non-spherical pairing in single flavor color superconductivity(CSC) can not be restricted in a single non-s-wave channel and the mixing among different angular momenta will occur. In this paper, we examine the angular momentum mixing in single flavor CSC with transverse pairing, in which the pairing quarks have opposite helicity. We find that the free energy of all non-spherical pairing states are lowered by angular momentum mixing compared with that contain p-wave only. But the amount of the free energy drop is numerically small. Consequently the most stable pairing state that respect the time reversal invariance remains the spherical CSL. |
1005.1998 | Shuji Sasagawa | Shuji Sasagawa and Hidekazu Tanaka | Numerical Calculation of Schwinger-Dyson Equation with
Momentum-Dependent Gauge Parameter at Finite Temperature | 15 page, 12 figures | Prog.Theor.Phys.123:533-545, 2010 | 10.1143/PTP.123.533 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Chiral symmetry at finite temperature is studied using the Schwinger-Dyson
equation.
We calculate numerically the critical temperature using the Schwinger-Dyson
equation with the gauge parameter that depends on an external momentum.
The critical temperature obtained by this method is similar to that with the
Landau gauge and wave function renormalization constant 1. Moreover, the gauge
invariance in the ladder approximation is examined using our method.
| [
{
"created": "Wed, 12 May 2010 06:51:00 GMT",
"version": "v1"
},
{
"created": "Sun, 27 Jun 2010 12:13:24 GMT",
"version": "v2"
}
] | 2015-03-17 | [
[
"Sasagawa",
"Shuji",
""
],
[
"Tanaka",
"Hidekazu",
""
]
] | Chiral symmetry at finite temperature is studied using the Schwinger-Dyson equation. We calculate numerically the critical temperature using the Schwinger-Dyson equation with the gauge parameter that depends on an external momentum. The critical temperature obtained by this method is similar to that with the Landau gauge and wave function renormalization constant 1. Moreover, the gauge invariance in the ladder approximation is examined using our method. |
2404.15984 | Christian G\"utschow | Christian Bierlich, Andy Buckley, Jonathan Butterworth, Christian
Gutschow, Leif Lonnblad, Tomasz Procter, Peter Richardson, Yoran Yeh | Robust Independent Validation of Experiment and Theory: Rivet version 4
release note | null | null | null | MCNET-24-05 | hep-ph hep-ex | http://creativecommons.org/licenses/by/4.0/ | The Rivet toolkit is the primary mechanism for phenomenological preservation
of collider-physics measurements, containing both a computational core and API
for analysis implementation, and a large collection of more than a thousand
preserved analyses. In this note we summarise the main changes in the new Rivet
4 major release series. These include a major generalisation and more
semantically coherent model for histograms and related data objects, a thorough
clean-up of inelegant and legacy observable-computation tools, and new systems
for extended analysis-data, incorporation of preserved machine-learning models,
and serialization for high-performance computing applications. Where these
changes introduce backward-incompatible interface changes, existing analyses
have been updated and indications are given on how to update new analysis
routines and workflows.
| [
{
"created": "Wed, 24 Apr 2024 17:00:24 GMT",
"version": "v1"
},
{
"created": "Mon, 13 May 2024 08:09:41 GMT",
"version": "v2"
},
{
"created": "Tue, 13 Aug 2024 08:28:56 GMT",
"version": "v3"
}
] | 2024-08-14 | [
[
"Bierlich",
"Christian",
""
],
[
"Buckley",
"Andy",
""
],
[
"Butterworth",
"Jonathan",
""
],
[
"Gutschow",
"Christian",
""
],
[
"Lonnblad",
"Leif",
""
],
[
"Procter",
"Tomasz",
""
],
[
"Richardson",
"Peter",
... | The Rivet toolkit is the primary mechanism for phenomenological preservation of collider-physics measurements, containing both a computational core and API for analysis implementation, and a large collection of more than a thousand preserved analyses. In this note we summarise the main changes in the new Rivet 4 major release series. These include a major generalisation and more semantically coherent model for histograms and related data objects, a thorough clean-up of inelegant and legacy observable-computation tools, and new systems for extended analysis-data, incorporation of preserved machine-learning models, and serialization for high-performance computing applications. Where these changes introduce backward-incompatible interface changes, existing analyses have been updated and indications are given on how to update new analysis routines and workflows. |
0704.2588 | Wai-Yee Keung | Kingman Cheung, Wai-Yee Keung, and Tzu-Chiang Yuan | Collider signals in unparticle physics | 4 pages including 4 figures | Phys.Rev.Lett.99:051803,2007 | 10.1103/PhysRevLett.99.051803 | null | hep-ph | null | Phenomenology of the notion of an unparticle U, recently perceived by Georgi,
to describe a scale invariant sector with a non-trivial infrared fixed point at
a higher energy scale is explored in details. Behaving like a collection of d_U
(the scale dimension of the unparticle operator O_U) invisible massless
particles, this unparticle can be unveiled by measurements of various energy
distributions for the processes Z to fermion pair + U and e-e+ to gamma U at
e-e+ colliders, as well as mono-jet production at hadron colliders. We also
study the propagator effects of the unparticle through the Drell-Yan tree level
process and the one-loop muon anomaly.
| [
{
"created": "Thu, 19 Apr 2007 19:51:52 GMT",
"version": "v1"
},
{
"created": "Wed, 25 Apr 2007 19:35:51 GMT",
"version": "v2"
},
{
"created": "Thu, 9 Aug 2007 20:02:37 GMT",
"version": "v3"
}
] | 2008-11-26 | [
[
"Cheung",
"Kingman",
""
],
[
"Keung",
"Wai-Yee",
""
],
[
"Yuan",
"Tzu-Chiang",
""
]
] | Phenomenology of the notion of an unparticle U, recently perceived by Georgi, to describe a scale invariant sector with a non-trivial infrared fixed point at a higher energy scale is explored in details. Behaving like a collection of d_U (the scale dimension of the unparticle operator O_U) invisible massless particles, this unparticle can be unveiled by measurements of various energy distributions for the processes Z to fermion pair + U and e-e+ to gamma U at e-e+ colliders, as well as mono-jet production at hadron colliders. We also study the propagator effects of the unparticle through the Drell-Yan tree level process and the one-loop muon anomaly. |
hep-ph/0305328 | Wolfgang Hollik | W. Hollik, H. Rzehak | The sfermion mass spectrum of the MSSM at the one-loop level | 13 pages, 3 figures, version to appear in Eur. Phys. J. C | Eur.Phys.J. C32 (2003) 127-133 | 10.1140/epjc/s2003-01387-9 | null | hep-ph | null | The sfermion-mass spectrum of the minimal supersymmetric standard model is
investigated at the one-loop level. An on-shell scheme has been specified for
renormalization of the basic breaking parameters of the sfermionic sector.
Owing to SU(2)-invariance, the soft-breaking mass parameters of the left-chiral
scalar fermions of each isospin doublet are identical. Thus, one of the
sfermion-masses of each doublet can be expressed in terms of the other masses
and receives a mass shift at the one-loop level with respect to the
lowest-order value, which can be of $O(10$ GeV). Both strong and electroweak
contributions have been calculated for scalar quarks and leptons.
| [
{
"created": "Fri, 30 May 2003 09:50:25 GMT",
"version": "v1"
},
{
"created": "Wed, 12 Nov 2003 17:18:56 GMT",
"version": "v2"
}
] | 2009-11-10 | [
[
"Hollik",
"W.",
""
],
[
"Rzehak",
"H.",
""
]
] | The sfermion-mass spectrum of the minimal supersymmetric standard model is investigated at the one-loop level. An on-shell scheme has been specified for renormalization of the basic breaking parameters of the sfermionic sector. Owing to SU(2)-invariance, the soft-breaking mass parameters of the left-chiral scalar fermions of each isospin doublet are identical. Thus, one of the sfermion-masses of each doublet can be expressed in terms of the other masses and receives a mass shift at the one-loop level with respect to the lowest-order value, which can be of $O(10$ GeV). Both strong and electroweak contributions have been calculated for scalar quarks and leptons. |
1508.07402 | Robert Foot | R. Foot | Can dark matter - electron scattering explain the DAMA annual modulation
consistent with XENON100 constraints? | This paper used an oversimplified description of a complex problem
which is unlikely to be very useful. A better description is given in
1512.06471, which supersedes this paper | null | null | null | hep-ph astro-ph.GA | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | For many years annually modulating $\sim$ keV scintillations have been
observed in the DAMA/NaI and DAMA/Libra experiments. A dark matter - electron
scattering interpretation is now favoured given the stringent constraints on
nuclear recoil rates obtained by LUX, SuperCDMS and other experiments. Very
recently, the XENON100 experiment has observed a modest annual modulation in
their electron recoil events (2.8 $\sigma$ C.L.) with phase consistent with
that of the DAMA experiments. However, they also found a stringent upper limit
on the unmodulated rate, which suggests that any dark matter - electron
scattering interpretation of these annual modulations must involve a large
modulation fraction $\stackrel{>}{\sim} 50\%$. Here we discuss the extent to
which these results might be able to be accommodated within multi-component
dark matter models featuring light dark matter particles of mass $\sim$ MeV,
focusing on the mirror dark matter case for definiteness. The importance of
diurnal variation as a means of testing these kinds of models is also
discussed.
| [
{
"created": "Sat, 29 Aug 2015 05:37:40 GMT",
"version": "v1"
},
{
"created": "Thu, 1 Oct 2015 03:14:40 GMT",
"version": "v2"
},
{
"created": "Wed, 29 Jun 2016 22:42:05 GMT",
"version": "v3"
}
] | 2016-07-01 | [
[
"Foot",
"R.",
""
]
] | For many years annually modulating $\sim$ keV scintillations have been observed in the DAMA/NaI and DAMA/Libra experiments. A dark matter - electron scattering interpretation is now favoured given the stringent constraints on nuclear recoil rates obtained by LUX, SuperCDMS and other experiments. Very recently, the XENON100 experiment has observed a modest annual modulation in their electron recoil events (2.8 $\sigma$ C.L.) with phase consistent with that of the DAMA experiments. However, they also found a stringent upper limit on the unmodulated rate, which suggests that any dark matter - electron scattering interpretation of these annual modulations must involve a large modulation fraction $\stackrel{>}{\sim} 50\%$. Here we discuss the extent to which these results might be able to be accommodated within multi-component dark matter models featuring light dark matter particles of mass $\sim$ MeV, focusing on the mirror dark matter case for definiteness. The importance of diurnal variation as a means of testing these kinds of models is also discussed. |
hep-ph/9712211 | null | V. A. Maisheev | Gamma-quanta propagation in single crystals | 6 pages, 6 eps figures, Latex, epsfig.sty, typos corrected | null | null | null | hep-ph physics.ins-det | null | Propagation of gamma-quanta in the single crystals, oriented in a region of
the coherent pair production is considered. The qualitative description of the
process is also discussed. The theory of gamma-quanta propagation in the
anisotropic medium is illustrated by the help of the particular calculations of
such a process in silicon single crystals.
It is shown that the single crystals are sensitive to the initial circular
polarization of gamma-beam despite the fact that the cross section of
absorption is independent of it. The reason is that the normal electromagnetic
waves (an eigenfunctions of the problem) are elliptically polarized. The speeds
of absorption and motion of both the normal waves are different and as a result
the process of gamma-quanta propagation depend on the initial polarization
state. The calculated value of asymmetry is about 20% for 25 GeV gamma-quanta
propagating in 100 cm silicon single crystal.
The obtained results are useful in creating of polarimeters for high energy
electrons and gamma-quanta.
| [
{
"created": "Mon, 1 Dec 1997 07:29:36 GMT",
"version": "v1"
},
{
"created": "Fri, 5 Dec 1997 07:31:06 GMT",
"version": "v2"
}
] | 2016-09-06 | [
[
"Maisheev",
"V. A.",
""
]
] | Propagation of gamma-quanta in the single crystals, oriented in a region of the coherent pair production is considered. The qualitative description of the process is also discussed. The theory of gamma-quanta propagation in the anisotropic medium is illustrated by the help of the particular calculations of such a process in silicon single crystals. It is shown that the single crystals are sensitive to the initial circular polarization of gamma-beam despite the fact that the cross section of absorption is independent of it. The reason is that the normal electromagnetic waves (an eigenfunctions of the problem) are elliptically polarized. The speeds of absorption and motion of both the normal waves are different and as a result the process of gamma-quanta propagation depend on the initial polarization state. The calculated value of asymmetry is about 20% for 25 GeV gamma-quanta propagating in 100 cm silicon single crystal. The obtained results are useful in creating of polarimeters for high energy electrons and gamma-quanta. |
1711.05495 | Pablo G. Ortega | Pablo G. Ortega, Jorge Segovia, David R. Entem, Francisco Fern\'andez | Threshold effects in hadron spectrum: a new spectroscopy? | Proceedings of 6th International Conference on New Frontiers in
Physics (ICNFP 2017). 10 pages, 1 figure, 8 tables | null | 10.1051/epjconf/201818202094 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The exploration of energies above the open-flavor threshold in the meson
spectra has led to the appearance of unexpected states difficult to accommodate
in the naive picture of a bound state of a quark and an antiquark. Many of such
states are located close to meson-meson thresholds, which suggests that
molecular structures may be a relevant component in the total wave function of
such resonances.
In this work, the state of meson-meson molecules calculations is reviewed,
using a non-relativistic constituent quark model that has been applied to a
wide range of hadronic observables, and therefore all model parameters are
completely constrained. The model has been able to reproduce, among others, the
properties of the X(3872), described as a mixture of $c\bar c$ and $D\bar
D^\ast$ states, or the spectrum of the P-wave charm-strange mesons, which are
well reproduced only if $DK$ and $D^\ast K$ structures are taken into account.
We show that such constituent quark model, which is able to describe the
ordinary heavy meson spectra, is also capable of providing a good description
of many new states recently reported.
| [
{
"created": "Wed, 15 Nov 2017 10:53:17 GMT",
"version": "v1"
}
] | 2018-08-29 | [
[
"Ortega",
"Pablo G.",
""
],
[
"Segovia",
"Jorge",
""
],
[
"Entem",
"David R.",
""
],
[
"Fernández",
"Francisco",
""
]
] | The exploration of energies above the open-flavor threshold in the meson spectra has led to the appearance of unexpected states difficult to accommodate in the naive picture of a bound state of a quark and an antiquark. Many of such states are located close to meson-meson thresholds, which suggests that molecular structures may be a relevant component in the total wave function of such resonances. In this work, the state of meson-meson molecules calculations is reviewed, using a non-relativistic constituent quark model that has been applied to a wide range of hadronic observables, and therefore all model parameters are completely constrained. The model has been able to reproduce, among others, the properties of the X(3872), described as a mixture of $c\bar c$ and $D\bar D^\ast$ states, or the spectrum of the P-wave charm-strange mesons, which are well reproduced only if $DK$ and $D^\ast K$ structures are taken into account. We show that such constituent quark model, which is able to describe the ordinary heavy meson spectra, is also capable of providing a good description of many new states recently reported. |
1306.1911 | David London | Bhubanjyoti Bhattacharya, Alakabha Datta, Murugeswaran Duraisamy and
David London | Searching for New Physics with bbar -> sbar Bs -> V_1 V_2 Penguin Decays | 21 pages, no figures. Reference added | null | 10.1103/PhysRevD.88.016007 | UMISS-HEP-2013-06, UdeM-GPP-TH-13-224 | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present the most general (six-helicity) angular analysis of Bs -> V_1 (->
P_1P'_1) V_2 (-> P_2P'_2) (V_i is a vector meson, and P_i, P'_i are
pseudoscalars). We focus on final states accessible to both Bs and Bsbar --
these are mainly bbar -> sbar penguin decays. We also derive the most general
decay amplitude, and discuss the differences between it and that used by LHCb
in its analysis of Bs -> phi phi. In the standard model, all CP violation is
predicted to be small, so that the simple measurement of a sizeable
CP-violating observable indicates the presence of new physics. A full fit to
the data is not necessary. By determining which of the CP-violating observables
are nonzero, one can learn about the structure of the underlying NP. Finally,
we apply the angular analysis to Bs -> K^{*0} Kbar^{*0}, and show that there
are numerous CP-violating observables that remain in the untagged data sample.
| [
{
"created": "Sat, 8 Jun 2013 12:18:19 GMT",
"version": "v1"
},
{
"created": "Sun, 16 Jun 2013 14:21:34 GMT",
"version": "v2"
}
] | 2013-08-09 | [
[
"Bhattacharya",
"Bhubanjyoti",
""
],
[
"Datta",
"Alakabha",
""
],
[
"Duraisamy",
"Murugeswaran",
""
],
[
"London",
"David",
""
]
] | We present the most general (six-helicity) angular analysis of Bs -> V_1 (-> P_1P'_1) V_2 (-> P_2P'_2) (V_i is a vector meson, and P_i, P'_i are pseudoscalars). We focus on final states accessible to both Bs and Bsbar -- these are mainly bbar -> sbar penguin decays. We also derive the most general decay amplitude, and discuss the differences between it and that used by LHCb in its analysis of Bs -> phi phi. In the standard model, all CP violation is predicted to be small, so that the simple measurement of a sizeable CP-violating observable indicates the presence of new physics. A full fit to the data is not necessary. By determining which of the CP-violating observables are nonzero, one can learn about the structure of the underlying NP. Finally, we apply the angular analysis to Bs -> K^{*0} Kbar^{*0}, and show that there are numerous CP-violating observables that remain in the untagged data sample. |
1606.00946 | S. Ganesh | S. Ganesh, M. Mishra | Effect of temperature gradient on heavy quark anti-quark potential using
gravity dual model | 17 pages, 7 figures. Accepted in PTEP (Progress of Theoretical and
Experimental Physics) | Prog Theor Exp Phys (2020) | 10.1093/ptep/ptaa180 | null | hep-ph gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Thermal systems have traditionally been modeled via Euclideanized space by
analytical continuation of time to an imaginary time. We extend the concept to
static thermal gradients by recasting the temperature variation as a variation
in the Euclidean metric. We apply this prescription to determine the Quark
anti-Quark potential in a system with thermal gradient. A naturally occurring
QCD medium with thermal gradients is a Quark Gluon Plasma (QGP). However, the
QGP evolves in time. Hence, we use a quasi-stationary approximation, which is
applicable only if the rate of time evolution is slow. The application of our
proposal to a Quark anti-Quark potential in QGP can be seen as a step towards a
more exact theory which would incorporate time varying thermal gradients. The
effect of a static temperature gradient on the Quark anti-Quark potential is
analyzed using a gravity dual model. A non-uniform black string metric is
developed, by perturbing the Schwarzchild metric, which allows to incorporate
the temperature gradient in the dual AdS space. Finally, an expression for the
Quark anti-Quark potential, in the presence of a static temperature gradient,
is derived.
| [
{
"created": "Fri, 3 Jun 2016 01:54:05 GMT",
"version": "v1"
},
{
"created": "Mon, 13 Nov 2017 14:06:09 GMT",
"version": "v2"
},
{
"created": "Fri, 3 Apr 2020 10:52:21 GMT",
"version": "v3"
},
{
"created": "Sat, 12 Dec 2020 06:15:53 GMT",
"version": "v4"
}
] | 2021-02-10 | [
[
"Ganesh",
"S.",
""
],
[
"Mishra",
"M.",
""
]
] | Thermal systems have traditionally been modeled via Euclideanized space by analytical continuation of time to an imaginary time. We extend the concept to static thermal gradients by recasting the temperature variation as a variation in the Euclidean metric. We apply this prescription to determine the Quark anti-Quark potential in a system with thermal gradient. A naturally occurring QCD medium with thermal gradients is a Quark Gluon Plasma (QGP). However, the QGP evolves in time. Hence, we use a quasi-stationary approximation, which is applicable only if the rate of time evolution is slow. The application of our proposal to a Quark anti-Quark potential in QGP can be seen as a step towards a more exact theory which would incorporate time varying thermal gradients. The effect of a static temperature gradient on the Quark anti-Quark potential is analyzed using a gravity dual model. A non-uniform black string metric is developed, by perturbing the Schwarzchild metric, which allows to incorporate the temperature gradient in the dual AdS space. Finally, an expression for the Quark anti-Quark potential, in the presence of a static temperature gradient, is derived. |
1103.2025 | Peng Sun | Cong-Feng Qiao and Peng Sun and Feng Yuan | NLO QCD Corrections to $B_c$-to-Charmonium Form Factors | null | null | 10.1007/JHEP08(2012)087 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The $B_c(^1S_0)$ meson to S-wave Charmonia transition form factors are
calculated in next-to-leading order(NLO) accuracy of Quantum
Chromodynamics(QCD). Our results indicate that the higher order corrections to
these form factors are remarkable, and hence are important to the
phenomenological study of the corresponding processes. For the convenience of
comparison and use, the relevant expressions in asymptotic form at the limit of
$m_c\rightarrow0$ for the radiative corrections are presented.
| [
{
"created": "Thu, 10 Mar 2011 13:10:57 GMT",
"version": "v1"
},
{
"created": "Mon, 13 Jun 2011 12:48:20 GMT",
"version": "v2"
},
{
"created": "Sun, 15 Apr 2012 05:18:57 GMT",
"version": "v3"
}
] | 2015-05-27 | [
[
"Qiao",
"Cong-Feng",
""
],
[
"Sun",
"Peng",
""
],
[
"Yuan",
"Feng",
""
]
] | The $B_c(^1S_0)$ meson to S-wave Charmonia transition form factors are calculated in next-to-leading order(NLO) accuracy of Quantum Chromodynamics(QCD). Our results indicate that the higher order corrections to these form factors are remarkable, and hence are important to the phenomenological study of the corresponding processes. For the convenience of comparison and use, the relevant expressions in asymptotic form at the limit of $m_c\rightarrow0$ for the radiative corrections are presented. |
2301.07443 | Di Wang | Jin-Feng Luo, Di Wang | Isospin sum rules in charmed baryon weak decays | 47 pages. arXiv admin note: text overlap with arXiv:2301.06104 | null | null | null | hep-ph | http://creativecommons.org/licenses/by/4.0/ | Isospin symmetry is the most precise flavor symmetry. The effective
Hamiltonian of charm quark weak decay is zero under the isospin lowering
operators $I_-^n$, which permits us to generate isospin sum rules through
several master formulas. In this work, we derive the master formulas of isospin
sum rules for the two- and three-body non-leptonic decays of singly and doubly
charmed baryons. Hundreds of isospin sum rules are derived to test of isospin
symmetry and provide hints for the new decay modes. The isospin sum rules for
multi-body decays are not broken by the intermediate resonances and hence can
be used to study the isospin partners of exotic hadrons.
| [
{
"created": "Wed, 18 Jan 2023 11:31:56 GMT",
"version": "v1"
},
{
"created": "Fri, 24 May 2024 10:51:48 GMT",
"version": "v2"
}
] | 2024-05-27 | [
[
"Luo",
"Jin-Feng",
""
],
[
"Wang",
"Di",
""
]
] | Isospin symmetry is the most precise flavor symmetry. The effective Hamiltonian of charm quark weak decay is zero under the isospin lowering operators $I_-^n$, which permits us to generate isospin sum rules through several master formulas. In this work, we derive the master formulas of isospin sum rules for the two- and three-body non-leptonic decays of singly and doubly charmed baryons. Hundreds of isospin sum rules are derived to test of isospin symmetry and provide hints for the new decay modes. The isospin sum rules for multi-body decays are not broken by the intermediate resonances and hence can be used to study the isospin partners of exotic hadrons. |
1808.10309 | Natascia Vignaroli | Natascia Vignaroli | Seeking leptoquarks in the $\bf t\bar{t}$ plus missing energy channel at
the high-luminosity LHC | 19 pages, 8 figures. Matches version to appear in Physical Review D | Phys. Rev. D 99, 035021 (2019) | 10.1103/PhysRevD.99.035021 | null | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The $t\bar t$ plus missing energy channel is one of the most efficient to
detect third-generation leptoquarks (LQs). It offers an important test to
models which explain flavor anomalies in $B$ meson decays. We outline a search
strategy in the channel, relying on tagging the tops and on observables
constructed out of the tops, and we assess the reach on LQs of the future
high-luminosity LHC program. We find that with 3 ab$^{-1}$ a vector (scalar) LQ
decaying 50% (100%) to top and neutrino can be excluded up to masses of 1.96
TeV (1.54 TeV). We also indicate several observables that, in case of a future
discovery in the channel, can be used to distinguish a scalar LQ from a vector
LQ. The implications of our findings to models addressing the recent flavor
anomalies are finally discussed.
| [
{
"created": "Thu, 30 Aug 2018 14:18:52 GMT",
"version": "v1"
},
{
"created": "Wed, 30 Jan 2019 14:17:12 GMT",
"version": "v2"
}
] | 2019-02-20 | [
[
"Vignaroli",
"Natascia",
""
]
] | The $t\bar t$ plus missing energy channel is one of the most efficient to detect third-generation leptoquarks (LQs). It offers an important test to models which explain flavor anomalies in $B$ meson decays. We outline a search strategy in the channel, relying on tagging the tops and on observables constructed out of the tops, and we assess the reach on LQs of the future high-luminosity LHC program. We find that with 3 ab$^{-1}$ a vector (scalar) LQ decaying 50% (100%) to top and neutrino can be excluded up to masses of 1.96 TeV (1.54 TeV). We also indicate several observables that, in case of a future discovery in the channel, can be used to distinguish a scalar LQ from a vector LQ. The implications of our findings to models addressing the recent flavor anomalies are finally discussed. |
2309.09155 | Hoernisa Iminniyaz | Fangyu Liu, Hoernisa Iminniyaz | Constraints on Asymmetric Dark Matter Self Annihilation Cross Sections
in Non-standard Cosmological Scenarios | 14 pages, 6 figures | null | null | null | hep-ph | http://creativecommons.org/licenses/by-nc-sa/4.0/ | We investigate the relic abundance of asymmetric dark matter in the
non-standard cosmological scenarios when the annihilation cross section
includes self annihilations. Here we discuss the kination model and brane world
cosmology. When the self annihilation is permitted for asymmetric dark matter,
there is possibility of washing out the pre-existed asymmetry. We find the
constraints on the cross section to avoid the complete washing out of the
asymmetry in the non-standard cosmological scenarios. The enhanced cosmic
expansion rate causes the freeze out point of wash-out to be earlier. The
larger self annihilation cross sections are allowed to exist in kination model
and brane world cosmology. Then, in the case of left-handed sneutrino
asymmetric dark matter, we find the value of the lower bound on winos mass is
smaller than that in the standard cosmological scenario.
| [
{
"created": "Sun, 17 Sep 2023 04:43:05 GMT",
"version": "v1"
},
{
"created": "Sun, 29 Oct 2023 12:57:39 GMT",
"version": "v2"
},
{
"created": "Fri, 9 Feb 2024 04:43:34 GMT",
"version": "v3"
}
] | 2024-02-12 | [
[
"Liu",
"Fangyu",
""
],
[
"Iminniyaz",
"Hoernisa",
""
]
] | We investigate the relic abundance of asymmetric dark matter in the non-standard cosmological scenarios when the annihilation cross section includes self annihilations. Here we discuss the kination model and brane world cosmology. When the self annihilation is permitted for asymmetric dark matter, there is possibility of washing out the pre-existed asymmetry. We find the constraints on the cross section to avoid the complete washing out of the asymmetry in the non-standard cosmological scenarios. The enhanced cosmic expansion rate causes the freeze out point of wash-out to be earlier. The larger self annihilation cross sections are allowed to exist in kination model and brane world cosmology. Then, in the case of left-handed sneutrino asymmetric dark matter, we find the value of the lower bound on winos mass is smaller than that in the standard cosmological scenario. |
2202.03372 | Christopher Cocuzza | C. Cocuzza, W. Melnitchouk, A. Metz, N. Sato | Polarized Antimatter in the Proton from Global QCD Analysis | 4 figures | null | 10.1103/PhysRevD.106.L031502 | null | hep-ph hep-ex nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present the first simultaneous global QCD analysis of spin-dependent
parton distribution functions alongside their spin-averaged counterparts and
pion, kaon, and unidentified hadron fragmentation functions. This analysis
includes all data relevant for constraining the polarized light quark sea
asymmetry $\Delta \bar{u} - \Delta \bar{d}$, in particular the latest polarized
$W$-lepton production data from the STAR collaboration at RHIC and
semi-inclusive deep inelastic scattering data from COMPASS, allowing the most
robust extraction available with minimal theoretical assumptions. We also
extract a self-consistent set of antiquark polarization ratios $\Delta
\bar{u}/\bar{u}$ and $\Delta \bar{d}/\bar{d}$ and determine the signs of the
truncated contributions to the proton spin from the light antiquarks.
| [
{
"created": "Mon, 7 Feb 2022 17:43:26 GMT",
"version": "v1"
},
{
"created": "Thu, 7 Sep 2023 15:13:28 GMT",
"version": "v2"
}
] | 2023-09-08 | [
[
"Cocuzza",
"C.",
""
],
[
"Melnitchouk",
"W.",
""
],
[
"Metz",
"A.",
""
],
[
"Sato",
"N.",
""
]
] | We present the first simultaneous global QCD analysis of spin-dependent parton distribution functions alongside their spin-averaged counterparts and pion, kaon, and unidentified hadron fragmentation functions. This analysis includes all data relevant for constraining the polarized light quark sea asymmetry $\Delta \bar{u} - \Delta \bar{d}$, in particular the latest polarized $W$-lepton production data from the STAR collaboration at RHIC and semi-inclusive deep inelastic scattering data from COMPASS, allowing the most robust extraction available with minimal theoretical assumptions. We also extract a self-consistent set of antiquark polarization ratios $\Delta \bar{u}/\bar{u}$ and $\Delta \bar{d}/\bar{d}$ and determine the signs of the truncated contributions to the proton spin from the light antiquarks. |
hep-ph/0002035 | Michael Spira | S. Dittmaier, M. Kr\"amer, Y. Liao, M. Spira and P.M. Zerwas | Higgs radiation off quarks in supersymmetric theories at e^+e^-
colliders | 12 pages, latex, 3 figures | Phys.Lett. B478 (2000) 247-254 | 10.1016/S0370-2693(00)00278-1 | DESY 99-177, BI-TP 99/27, Edinburgh 2000/03 | hep-ph | null | Yukawa couplings between Higgs bosons and quarks in supersymmetric theories
can be measured in the processes e^+e^- -> Q Qbar + Higgs. We have determined
the cross sections of these processes in the minimal supersymmetric model
including the complete set of next-to-leading order QCD corrections for all
channels.
| [
{
"created": "Thu, 3 Feb 2000 08:53:54 GMT",
"version": "v1"
}
] | 2016-09-06 | [
[
"Dittmaier",
"S.",
""
],
[
"Krämer",
"M.",
""
],
[
"Liao",
"Y.",
""
],
[
"Spira",
"M.",
""
],
[
"Zerwas",
"P. M.",
""
]
] | Yukawa couplings between Higgs bosons and quarks in supersymmetric theories can be measured in the processes e^+e^- -> Q Qbar + Higgs. We have determined the cross sections of these processes in the minimal supersymmetric model including the complete set of next-to-leading order QCD corrections for all channels. |
1101.4410 | Danny Marfatia | V. Barger, Y. Gao, D. Marfatia | Dark matter at DeepCore and IceCube | 23 pages, 7 figures, 4 tables. Version to appear in PRD | Phys.Rev.D83:055012,2011 | 10.1103/PhysRevD.83.055012 | null | hep-ph astro-ph.HE hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | With the augmentation of IceCube by DeepCore, the prospect for detecting dark
matter annihilation in the Sun is much improved. To complement this
experimental development, we provide a thorough template analysis of the
particle physics issues that are necessary to precisely interpret the data. Our
study is about nitty-gritty and is intended as a framework for detailed work on
a variety of dark matter candidates. To accurately predict the source neutrino
spectrum, we account for spin correlations of the final state particles and the
helicity-dependence of their decays, and absorption effects at production. We
fully treat the propagation of neutrinos through the Sun, including neutrino
oscillations, energy losses and tau regeneration. We simulate the survival
probability of muons produced in the Earth by using the Muon Monte Carlo
program, reproduce the published IceCube effective area, and update the
parameters in the differential equation that approximates muon energy losses.
To evaluate the zenith-angle dependent atmospheric background event rate, we
track the Sun and determine the time it spends at each zenith angle.
Throughout, we employ neutralino dark matter as our example.
| [
{
"created": "Sun, 23 Jan 2011 22:47:24 GMT",
"version": "v1"
},
{
"created": "Fri, 25 Feb 2011 16:53:08 GMT",
"version": "v2"
}
] | 2015-03-17 | [
[
"Barger",
"V.",
""
],
[
"Gao",
"Y.",
""
],
[
"Marfatia",
"D.",
""
]
] | With the augmentation of IceCube by DeepCore, the prospect for detecting dark matter annihilation in the Sun is much improved. To complement this experimental development, we provide a thorough template analysis of the particle physics issues that are necessary to precisely interpret the data. Our study is about nitty-gritty and is intended as a framework for detailed work on a variety of dark matter candidates. To accurately predict the source neutrino spectrum, we account for spin correlations of the final state particles and the helicity-dependence of their decays, and absorption effects at production. We fully treat the propagation of neutrinos through the Sun, including neutrino oscillations, energy losses and tau regeneration. We simulate the survival probability of muons produced in the Earth by using the Muon Monte Carlo program, reproduce the published IceCube effective area, and update the parameters in the differential equation that approximates muon energy losses. To evaluate the zenith-angle dependent atmospheric background event rate, we track the Sun and determine the time it spends at each zenith angle. Throughout, we employ neutralino dark matter as our example. |
1909.12113 | Nirbhay Kumar Behera Dr. | Nirbhay Kumar Behera, Ranjit Kumar Nayak and Sadhana Dash | Baseline study for net-proton number fluctuations at top energies
available at the BNL Relativistic Heavy Ion Collider and at the CERN Large
Hadron Collider with the Angantyr model | 14 pages, 9 figures, Published version | Phys. Rev. C 101, 064903 (2020) | 10.1103/PhysRevC.101.064903 | null | hep-ph hep-ex nucl-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The multiplicity percentile dependence of cumulants, of net-proton number
distributions in Au$-$Au collisions at $\sqrt{s_{NN}} = $ 200 GeV and Pb$-$Pb
collisions at $\sqrt{s_{NN}} = $ 2.76 TeV has been investigated using the
Angantyr model (the heavy-ion extension of the \textsc{Pythia 8} model). The
effects of finite transverse momentum ($p_{\mathrm T}$) and pseudorapidity
($\eta$) acceptance on the net-proton cumulants have also been studied.
Furthermore, the effects of the hydrodynamic expansion and feed down from weak
decays were explored. It was found that radial flow has substantial impact on
the cumulants and their ratios, while weak decays have a finite but relatively
smaller effect. The obtained values of cumulants and their ratios with the
Angantyr model, where the formation of thermalized medium is not assumed can
serve as a baseline for future measurements.
| [
{
"created": "Thu, 26 Sep 2019 14:01:52 GMT",
"version": "v1"
},
{
"created": "Sun, 14 Jun 2020 17:41:29 GMT",
"version": "v2"
}
] | 2020-07-01 | [
[
"Behera",
"Nirbhay Kumar",
""
],
[
"Nayak",
"Ranjit Kumar",
""
],
[
"Dash",
"Sadhana",
""
]
] | The multiplicity percentile dependence of cumulants, of net-proton number distributions in Au$-$Au collisions at $\sqrt{s_{NN}} = $ 200 GeV and Pb$-$Pb collisions at $\sqrt{s_{NN}} = $ 2.76 TeV has been investigated using the Angantyr model (the heavy-ion extension of the \textsc{Pythia 8} model). The effects of finite transverse momentum ($p_{\mathrm T}$) and pseudorapidity ($\eta$) acceptance on the net-proton cumulants have also been studied. Furthermore, the effects of the hydrodynamic expansion and feed down from weak decays were explored. It was found that radial flow has substantial impact on the cumulants and their ratios, while weak decays have a finite but relatively smaller effect. The obtained values of cumulants and their ratios with the Angantyr model, where the formation of thermalized medium is not assumed can serve as a baseline for future measurements. |
0908.2186 | Kai Wang | Tao Han, Hai-Shan Liu, Ming-xing Luo, Kai Wang, Wei Wu | Like-sign Di-lepton Signals in Higgsless Models at the LHC | 13 pages, 7 figures | Phys.Rev.D80:095010,2009 | 10.1103/PhysRevD.80.095010 | MADPH-09-1535, ZIMP-09-03, IPMU-09-0072, CAS-KITPC/ITP-131 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the potential LHC discovery of the Z1 KK gauge boson unitarizing
longitudinal W+W- scattering amplitude. In particular, we explore the decay
mode Z1->t tbar along with Z1-> W+W- without specifying the branching
fractions. We propose to exploit the associated production pp-> W Z1, and
select the final state of like-sign dileptons plus multijets and large missing
energy. We conclude that it is possible to observe the Z1 resonance at a 5
sigma level with an integrated luminosity of 100 inverse fb at the LHC upto 650
GeV for a dominant WW channel, and 560 GeV for a dominant ttbar channel.
| [
{
"created": "Sat, 15 Aug 2009 14:51:29 GMT",
"version": "v1"
}
] | 2010-12-09 | [
[
"Han",
"Tao",
""
],
[
"Liu",
"Hai-Shan",
""
],
[
"Luo",
"Ming-xing",
""
],
[
"Wang",
"Kai",
""
],
[
"Wu",
"Wei",
""
]
] | We study the potential LHC discovery of the Z1 KK gauge boson unitarizing longitudinal W+W- scattering amplitude. In particular, we explore the decay mode Z1->t tbar along with Z1-> W+W- without specifying the branching fractions. We propose to exploit the associated production pp-> W Z1, and select the final state of like-sign dileptons plus multijets and large missing energy. We conclude that it is possible to observe the Z1 resonance at a 5 sigma level with an integrated luminosity of 100 inverse fb at the LHC upto 650 GeV for a dominant WW channel, and 560 GeV for a dominant ttbar channel. |
1507.05640 | Davide Pagani | Fabio Maltoni, Davide Pagani, Ioannis Tsinikos | Associated production of a top-quark pair with vector bosons at NLO in
QCD: impact on $t \bar{t} H$ searches at the LHC | 44 pages, 23 figures. Version published on JHEP, typos in Table 5
have been corrected | null | 10.1007/JHEP02(2016)113 | CP3-15-20 | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the production of a top-quark pair in association with one and two
vector bosons, $t \bar t V$ and $t \bar t VV$ with $V=\gamma, Z, W^\pm$, at the
LHC. We provide predictions at next-to-leading order in QCD for total cross
sections and top-quark charge asymmetries as well as for differential
distributions. A thorough discussion of the residual theoretical uncertainties
related to missing higher orders and to parton distribution functions is
presented. As an application, we calculate the total cross sections for this
class of processes (together with $t \bar t H$ and $t \bar t t \bar t$
production) at hadron colliders for energies up to 100 TeV. In addition, by
matching the NLO calculation to a parton shower, we determine the contribution
of $t \bar t V$ and $t \bar t VV$ to final state signatures (two-photon and
two-same-sign-, three- and four-lepton) relevant for $t \bar t H$ analyses at
the Run II of the LHC.
| [
{
"created": "Mon, 20 Jul 2015 20:07:48 GMT",
"version": "v1"
},
{
"created": "Mon, 4 Apr 2016 15:55:41 GMT",
"version": "v2"
}
] | 2016-04-05 | [
[
"Maltoni",
"Fabio",
""
],
[
"Pagani",
"Davide",
""
],
[
"Tsinikos",
"Ioannis",
""
]
] | We study the production of a top-quark pair in association with one and two vector bosons, $t \bar t V$ and $t \bar t VV$ with $V=\gamma, Z, W^\pm$, at the LHC. We provide predictions at next-to-leading order in QCD for total cross sections and top-quark charge asymmetries as well as for differential distributions. A thorough discussion of the residual theoretical uncertainties related to missing higher orders and to parton distribution functions is presented. As an application, we calculate the total cross sections for this class of processes (together with $t \bar t H$ and $t \bar t t \bar t$ production) at hadron colliders for energies up to 100 TeV. In addition, by matching the NLO calculation to a parton shower, we determine the contribution of $t \bar t V$ and $t \bar t VV$ to final state signatures (two-photon and two-same-sign-, three- and four-lepton) relevant for $t \bar t H$ analyses at the Run II of the LHC. |
hep-ph/9911268 | Baldicchi Massimiliano | M. Baldicchi (Milano Univ.) | First principle quadratic and linear mass operators, quarkonium spectrum
and Regge trajectories | 6 pages, 2 figures, Talk given at the XVII Autumn School "QCD:
Perturbative or Nonperturbative?", Lisbon (Portugal), September 29 - October
4, 1999. To appear in the proceedings | null | null | null | hep-ph | null | In previous works, a squared mass operator M^2 and a more common centre of
frame Hamiltonian H_CM for the quark-antiquark system were obtained by using
the only assumption that ln W (W being the Wilson loop correlator) can be
written in QCD as the sum of its perturbative expression and an area term. We
evaluated the spectrum of these operators by neglecting all the spin-dependent
terms but for a spin-spin term. We succeeded in reproducing rather well the
entire meson spectrum and for the light-light systems we found straight Regge
trajectories with the right slope and intercepts. A first attempt to study the
contribution of the spin dependent terms has been made.
| [
{
"created": "Mon, 8 Nov 1999 11:51:15 GMT",
"version": "v1"
},
{
"created": "Tue, 9 Nov 1999 13:50:19 GMT",
"version": "v2"
}
] | 2007-05-23 | [
[
"Baldicchi",
"M.",
"",
"Milano Univ."
]
] | In previous works, a squared mass operator M^2 and a more common centre of frame Hamiltonian H_CM for the quark-antiquark system were obtained by using the only assumption that ln W (W being the Wilson loop correlator) can be written in QCD as the sum of its perturbative expression and an area term. We evaluated the spectrum of these operators by neglecting all the spin-dependent terms but for a spin-spin term. We succeeded in reproducing rather well the entire meson spectrum and for the light-light systems we found straight Regge trajectories with the right slope and intercepts. A first attempt to study the contribution of the spin dependent terms has been made. |
hep-ph/0701003 | Sukanta Panda | Namit Mahajan and Sukanta Panda | Probing Low-x QCD With Very High Energy Prompt Muons | 5 pages, 2 figures | null | null | null | hep-ph astro-ph hep-ex | null | We explore the possibility of utilizing the prompt muon fluxes at very high
energies in order to discriminate various models/parametrizations of low-x QCD
behaviour of hadronic cross-sections relevant at such energies. We find that
the pair meter technique for measuring high energy prompt muons can be very
efficient in such an endeavor. As a by product, it allows to cleanly probe the
change in composition of the primary cosmic rays expected at high energies.
| [
{
"created": "Sun, 31 Dec 2006 10:18:55 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Mahajan",
"Namit",
""
],
[
"Panda",
"Sukanta",
""
]
] | We explore the possibility of utilizing the prompt muon fluxes at very high energies in order to discriminate various models/parametrizations of low-x QCD behaviour of hadronic cross-sections relevant at such energies. We find that the pair meter technique for measuring high energy prompt muons can be very efficient in such an endeavor. As a by product, it allows to cleanly probe the change in composition of the primary cosmic rays expected at high energies. |
hep-ph/0002276 | Christian Schubert | Christian Schubert (LAPTH Annecy-le-Vieux) | Vacuum Polarisation Tensors in Constant Electromagnetic Fields: Part II | 18 pages, standard Latex, 1 figure | Nucl.Phys. B585 (2000) 429-442 | 10.1016/S0550-3213(00)00424-7 | LAPTH-783/2000 | hep-ph hep-th | null | In the second part of this series we apply the ``string-inspired'' technique
to the calculation of one-loop amplitudes involving both vectors and
axialvectors, as well as a general constant electromagnetic background field.
The vector-axialvector two-point function in a constant field is calculated
explicitly.
| [
{
"created": "Fri, 25 Feb 2000 18:42:20 GMT",
"version": "v1"
}
] | 2009-10-31 | [
[
"Schubert",
"Christian",
"",
"LAPTH Annecy-le-Vieux"
]
] | In the second part of this series we apply the ``string-inspired'' technique to the calculation of one-loop amplitudes involving both vectors and axialvectors, as well as a general constant electromagnetic background field. The vector-axialvector two-point function in a constant field is calculated explicitly. |
0708.2521 | Mariana Kirchbach | C. B. Compean, M. Kirchbach | Trigonometric quark confinement potential of QCD traits | 4 pages, 5 figures | Eur.Phys.J.A33:1-4,2007 | 10.1140/epja/i2007-10444-0 | null | hep-ph nucl-th | null | We make the case that the Coulomb- plus linear quark confinement potential
predicted by lattice QCD is an approximation to the exactly solvable
trigonometric Rosen-Morse potential that has the property to interpolate
between the Coulomb- and the infinite wells. We test the predictive power of
this potential in the description of the nucleon (considered as a quark-diquark
system) and provide analytic expressions for its mass spectrum and the proton
electric form factor. We compare the results obtained in this fashion to data
and find quite good agreement. We obtain an effective gluon propagator in
closed form as the Fourier transform of the potential under investigation.
| [
{
"created": "Mon, 20 Aug 2007 19:25:17 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Compean",
"C. B.",
""
],
[
"Kirchbach",
"M.",
""
]
] | We make the case that the Coulomb- plus linear quark confinement potential predicted by lattice QCD is an approximation to the exactly solvable trigonometric Rosen-Morse potential that has the property to interpolate between the Coulomb- and the infinite wells. We test the predictive power of this potential in the description of the nucleon (considered as a quark-diquark system) and provide analytic expressions for its mass spectrum and the proton electric form factor. We compare the results obtained in this fashion to data and find quite good agreement. We obtain an effective gluon propagator in closed form as the Fourier transform of the potential under investigation. |
hep-ph/0008278 | Paul H. Frampton | Paul H. Frampton | Economic Model for Neutrino Masses and Mixings | 3 pages LaTeX. Write-up of talk at DPF2000, August 9,2000 | Int.J.Mod.Phys. A16S1B (2001) 701-703 | 10.1142/S0217751X01007832 | IFP-786-UNC | hep-ph | null | Working in the framework of three chiral neutrinos with Majorana masses, we
investigate a scenario where the neutrino mass matrix is strictly off-diagonal
in the flavor basis, with all its diagonal entries precisely zero.
| [
{
"created": "Sat, 26 Aug 2000 22:58:02 GMT",
"version": "v1"
}
] | 2009-10-31 | [
[
"Frampton",
"Paul H.",
""
]
] | Working in the framework of three chiral neutrinos with Majorana masses, we investigate a scenario where the neutrino mass matrix is strictly off-diagonal in the flavor basis, with all its diagonal entries precisely zero. |
hep-ph/9508276 | null | D. Kharzeev and H. Satz | Charmonium Composition and Nuclear Suppression | Plain TeX, 8 pages, 5 figures available upon request | Phys.Lett.B366:316-322,1996 | 10.1016/0370-2693(95)01328-8 | CERN-TH/95-214, BI-TP 95/30 | hep-ph nucl-th | null | We study charmonium production in hadron-nucleus collisions through the
intermediate next-to-leading Fock space component $|(\bar{c}c)_8 g>$, formed by
a colour octet $\bar{c}c$ pair and a gluon. We estimate the size of this state
and show that its interaction with nucleons accounts for the observed
charmonium suppression in nuclear interactions.
| [
{
"created": "Thu, 10 Aug 1995 16:35:40 GMT",
"version": "v1"
}
] | 2010-11-19 | [
[
"Kharzeev",
"D.",
""
],
[
"Satz",
"H.",
""
]
] | We study charmonium production in hadron-nucleus collisions through the intermediate next-to-leading Fock space component $|(\bar{c}c)_8 g>$, formed by a colour octet $\bar{c}c$ pair and a gluon. We estimate the size of this state and show that its interaction with nucleons accounts for the observed charmonium suppression in nuclear interactions. |
1905.09143 | Kazunori Nakayama | Kazunori Nakayama | A Note on Gravitational Particle Production in Supergravity | 16 pages, 1 figure | null | 10.1016/j.physletb.2019.134857 | UT-19-11 | hep-ph astro-ph.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | It is pointed out that the gravitational particle production rate of a scalar
component of a chiral superfield in supergravity with minimal Kahler potential
can be significantly suppressed compared with a minimal scalar field in
non-supersymmetric Einstein gravity. This suppression is avoided for some
choice of the inflaton sector and also for non-minimal Kahler potential of the
chiral superfield.
| [
{
"created": "Wed, 22 May 2019 13:53:29 GMT",
"version": "v1"
}
] | 2019-08-14 | [
[
"Nakayama",
"Kazunori",
""
]
] | It is pointed out that the gravitational particle production rate of a scalar component of a chiral superfield in supergravity with minimal Kahler potential can be significantly suppressed compared with a minimal scalar field in non-supersymmetric Einstein gravity. This suppression is avoided for some choice of the inflaton sector and also for non-minimal Kahler potential of the chiral superfield. |
hep-ph/0212362 | Hiroshi Yokota | Yuko Fueki, Hisao Nakkagawa, Hiroshi Yokota, Koji Yoshida | Chiral Phase Transitions in QED at Finite Temperature: Dyson-Schwinger
Equation Analysis in the Real Time Hard-Thermal-Loop Approximation | Revtex4 with 6 figures, 11 pages | Prog.Theor.Phys. 110 (2003) 777-789 | 10.1143/PTP.110.777 | null | hep-ph | null | In order for clarifying what are the essential thermal effects that govern
the chiral phase transition at finite temperature, we investigate, in the
real-time thermal QED, the consequences of the Hard-Thermal-Loop (HTL) resummed
Dyson-Schwinger equation for the physical fermion mass function $\Sigma_R$.
Since $\Sigma_R$ is the mass function of an ``unstable'' quasi-particle in
thermal field theories, it necessarily has non-trivial imaginary parts together
with non-trivial wave function renormalization constants. In the present
analysis we correctly respect this fact, and study, in the ladder
approximation, the effect of HTL resummed gauge boson propagator. Our results
with the use of numerical analysis, show the two facts; i) The chiral phase
transition is of second order, since the fermion mass is dynamically generated
at a critical value of the temperature $T_c$, or at the critical coupling
constant $\alpha_c$, without any discontinuity, and ii) the critical
temperature $T_c$ at fixed value of $\alpha$ is significantly lower than the
previous results, namely the restoration of chiral symmetry occurs at lower
temperature than previously expected. The second fact shows the importance of
correctly taking the essential thermal effect into the analysis of chiral phase
transition, which are, in the previous analyses, neglected due to the
inappropriate approximations. The procedure how to maximally respect the gauge
invariance in the present approximation, is also discussed.
| [
{
"created": "Wed, 25 Dec 2002 09:53:44 GMT",
"version": "v1"
}
] | 2009-11-07 | [
[
"Fueki",
"Yuko",
""
],
[
"Nakkagawa",
"Hisao",
""
],
[
"Yokota",
"Hiroshi",
""
],
[
"Yoshida",
"Koji",
""
]
] | In order for clarifying what are the essential thermal effects that govern the chiral phase transition at finite temperature, we investigate, in the real-time thermal QED, the consequences of the Hard-Thermal-Loop (HTL) resummed Dyson-Schwinger equation for the physical fermion mass function $\Sigma_R$. Since $\Sigma_R$ is the mass function of an ``unstable'' quasi-particle in thermal field theories, it necessarily has non-trivial imaginary parts together with non-trivial wave function renormalization constants. In the present analysis we correctly respect this fact, and study, in the ladder approximation, the effect of HTL resummed gauge boson propagator. Our results with the use of numerical analysis, show the two facts; i) The chiral phase transition is of second order, since the fermion mass is dynamically generated at a critical value of the temperature $T_c$, or at the critical coupling constant $\alpha_c$, without any discontinuity, and ii) the critical temperature $T_c$ at fixed value of $\alpha$ is significantly lower than the previous results, namely the restoration of chiral symmetry occurs at lower temperature than previously expected. The second fact shows the importance of correctly taking the essential thermal effect into the analysis of chiral phase transition, which are, in the previous analyses, neglected due to the inappropriate approximations. The procedure how to maximally respect the gauge invariance in the present approximation, is also discussed. |
1412.1400 | Sergei Gninenko | S.N. Gninenko, N.V. Krasnikov, V.A. Matveev | Muon g-2 and searches for a new leptophobic sub-GeV dark boson in a
missing-energy experiment at CERN | 13 pages, 9 figures. Version to appear in PRD, refs. and discussions
added, title modified in journal | Phys. Rev. D91 (2015) 095015 | 10.1103/PhysRevD.91.095015 | null | hep-ph hep-ex physics.ins-det | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The 3.6 \sigma discrepancy between the predicted and measured values of the
anomalous magnetic moment of positive muons can be explained by the existence
of a new dark boson Z_\mu with a mass in the sub-GeV range, which is coupled
predominantly to the second and third lepton generations through the L_\mu -
L_\tau current . After a discussion of the present phenomenological bounds on
the Z_\mu coupling, we show that if the Z_\mu exists, it could be observed in
the reaction \mu+Z \to \mu+Z+Z_\mu of a muon scattering off nuclei by looking
for an excess of events with large missing muon beam energy in a detector due
to the prompt bremsstrahlung Z_\mu decay Z_\mu \to \nu\nu into a couple of
neutrinos. We describe the experimental technique and the preliminary study of
the feasibility for the proposed search. We show that this specific signal
allows for a the search for the Z_\mu with a sensitivity in the coupling
constant \alpha_\mu > 10^{-11}, which is 3 orders of magnitude higher than the
value required to explain the discrepancy. We point out that the availability
of high-energy and -intensity muon beams at CERN SPS provides a unique
opportunity to either discover or rule out the Z_\mu in the proposed search in
the near future. The experiment is based on the missing-energy approach
developed for the searches for invisible decays of dark photons and
(pseudo)scalar mesons at CERN and is complementary to these experiments.
| [
{
"created": "Wed, 3 Dec 2014 16:54:32 GMT",
"version": "v1"
},
{
"created": "Mon, 11 May 2015 14:34:14 GMT",
"version": "v2"
}
] | 2015-05-21 | [
[
"Gninenko",
"S. N.",
""
],
[
"Krasnikov",
"N. V.",
""
],
[
"Matveev",
"V. A.",
""
]
] | The 3.6 \sigma discrepancy between the predicted and measured values of the anomalous magnetic moment of positive muons can be explained by the existence of a new dark boson Z_\mu with a mass in the sub-GeV range, which is coupled predominantly to the second and third lepton generations through the L_\mu - L_\tau current . After a discussion of the present phenomenological bounds on the Z_\mu coupling, we show that if the Z_\mu exists, it could be observed in the reaction \mu+Z \to \mu+Z+Z_\mu of a muon scattering off nuclei by looking for an excess of events with large missing muon beam energy in a detector due to the prompt bremsstrahlung Z_\mu decay Z_\mu \to \nu\nu into a couple of neutrinos. We describe the experimental technique and the preliminary study of the feasibility for the proposed search. We show that this specific signal allows for a the search for the Z_\mu with a sensitivity in the coupling constant \alpha_\mu > 10^{-11}, which is 3 orders of magnitude higher than the value required to explain the discrepancy. We point out that the availability of high-energy and -intensity muon beams at CERN SPS provides a unique opportunity to either discover or rule out the Z_\mu in the proposed search in the near future. The experiment is based on the missing-energy approach developed for the searches for invisible decays of dark photons and (pseudo)scalar mesons at CERN and is complementary to these experiments. |
2006.16273 | Jeriek Van den Abeele | Andy Buckley, Anders Kvellestad, Are Raklev, Pat Scott, Jon Vegard
Sparre, Jeriek Van den Abeele, Ingrid A. Vazquez-Holm | $\textsf{Xsec}$: the cross-section evaluation code | Accepted version | Eur. Phys. J. C 80, 1106 (2020) | 10.1140/epjc/s10052-020-08635-y | SAGEX-20-17-E | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The evaluation of higher-order cross-sections is an important component in
the search for new physics, both at hadron colliders and elsewhere. For most
new physics processes of interest, total cross-sections are known at
next-to-leading order (NLO) in the strong coupling $\alpha_s$, and often
beyond, via either higher-order terms at fixed powers of $\alpha_s$, or
multi-emission resummation. However, the computation time for such higher-order
cross-sections is prohibitively expensive, and precludes efficient evaluation
in parameter-space scans beyond two dimensions. Here we describe the software
tool $\textsf{xsec}$, which allows for fast evaluation of cross-sections based
on the use of machine-learning regression, using distributed Gaussian processes
trained on a pre-generated sample of parameter points. This first version of
the code provides all NLO Minimal Supersymmetric Standard Model
strong-production cross-sections at the LHC, for individual flavour final
states, evaluated in a fraction of a second. Moreover, it calculates regression
errors, as well as estimates of errors from higher-order contributions, from
uncertainties in the parton distribution functions, and from the value of
$\alpha_s$. While we focus on a specific phenomenological model of
supersymmetry, the method readily generalises to any process where it is
possible to generate a sufficient training sample.
| [
{
"created": "Mon, 29 Jun 2020 18:01:13 GMT",
"version": "v1"
},
{
"created": "Fri, 18 Dec 2020 19:00:02 GMT",
"version": "v2"
}
] | 2020-12-29 | [
[
"Buckley",
"Andy",
""
],
[
"Kvellestad",
"Anders",
""
],
[
"Raklev",
"Are",
""
],
[
"Scott",
"Pat",
""
],
[
"Sparre",
"Jon Vegard",
""
],
[
"Abeele",
"Jeriek Van den",
""
],
[
"Vazquez-Holm",
"Ingrid A.",
"... | The evaluation of higher-order cross-sections is an important component in the search for new physics, both at hadron colliders and elsewhere. For most new physics processes of interest, total cross-sections are known at next-to-leading order (NLO) in the strong coupling $\alpha_s$, and often beyond, via either higher-order terms at fixed powers of $\alpha_s$, or multi-emission resummation. However, the computation time for such higher-order cross-sections is prohibitively expensive, and precludes efficient evaluation in parameter-space scans beyond two dimensions. Here we describe the software tool $\textsf{xsec}$, which allows for fast evaluation of cross-sections based on the use of machine-learning regression, using distributed Gaussian processes trained on a pre-generated sample of parameter points. This first version of the code provides all NLO Minimal Supersymmetric Standard Model strong-production cross-sections at the LHC, for individual flavour final states, evaluated in a fraction of a second. Moreover, it calculates regression errors, as well as estimates of errors from higher-order contributions, from uncertainties in the parton distribution functions, and from the value of $\alpha_s$. While we focus on a specific phenomenological model of supersymmetry, the method readily generalises to any process where it is possible to generate a sufficient training sample. |
2012.10228 | Fu-Hu Liu | Pei-Pin Yang, Mai-Ying Duan, Fu-Hu Liu | Dependence of related parameters on centrality and mass in a new
treatment for transverse momentum spectra in high energy collisions | 34 pages, 16 figures. The European Physical Journal A, accepted | The European Physical Journal A 57, 63 (2021) (32 pages) | 10.1140/epja/s10050-021-00380-4 | null | hep-ph hep-ex nucl-ex nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We collected the experimental data of transverse momentum spectra of
identified particles produced in proton-proton ($p$-$p$), deuteron-gold ($d$-Au
or $d$-$A$), gold-gold (Au-Au or $A$-$A$), proton-lead ($p$-Pb or $p$-$A$), and
lead-lead (Pb-Pb or $A$-$A$) collisions measured by the ALICE, CMS, LHCb, NA49,
NA61/SHINE, PHENIX, and STAR collaborations at different center-of mass
energies. The multisource thermal model at the quark level or the participant
quark model is used to describe the experimental data. The free parameters, the
effective temperature $T$, entropy index-related $n$, and revised index
$a_{0}$, in the revised Tsallis--Pareto-type function are extracted at the
quark level. In most cases, $T$ and $n$ in central collisions are larger than
those in peripheral collisions, and $a_0$ does not change in different
centrality classes. With the increase in the mass of produced particle or
participant quark, $T$ and $a_0$ increase, and $n$ does not change
significantly. The behaviors of related parameters from $p$-$p$, $p(d)$-$A$,
and $A$-$A$ collisions are similar.
| [
{
"created": "Fri, 18 Dec 2020 13:47:08 GMT",
"version": "v1"
},
{
"created": "Fri, 29 Jan 2021 13:34:54 GMT",
"version": "v2"
}
] | 2021-02-19 | [
[
"Yang",
"Pei-Pin",
""
],
[
"Duan",
"Mai-Ying",
""
],
[
"Liu",
"Fu-Hu",
""
]
] | We collected the experimental data of transverse momentum spectra of identified particles produced in proton-proton ($p$-$p$), deuteron-gold ($d$-Au or $d$-$A$), gold-gold (Au-Au or $A$-$A$), proton-lead ($p$-Pb or $p$-$A$), and lead-lead (Pb-Pb or $A$-$A$) collisions measured by the ALICE, CMS, LHCb, NA49, NA61/SHINE, PHENIX, and STAR collaborations at different center-of mass energies. The multisource thermal model at the quark level or the participant quark model is used to describe the experimental data. The free parameters, the effective temperature $T$, entropy index-related $n$, and revised index $a_{0}$, in the revised Tsallis--Pareto-type function are extracted at the quark level. In most cases, $T$ and $n$ in central collisions are larger than those in peripheral collisions, and $a_0$ does not change in different centrality classes. With the increase in the mass of produced particle or participant quark, $T$ and $a_0$ increase, and $n$ does not change significantly. The behaviors of related parameters from $p$-$p$, $p(d)$-$A$, and $A$-$A$ collisions are similar. |
hep-ph/9610215 | Michael Rueter | Michael Rueter (ITP Universit\"at Heidelberg) | Low energy theorems and the SU(3)-flux-tube | 4 pages, LaTeX, sprocl.sty, epsf.sty, 5 figures PostScript available
at: http://www.thphys.uni-heidelberg.de/~rueter/Publications.html to appear
in the proceedings of "Quark confinement and the hadron spectrum II", Como,
1996 | null | null | null | hep-ph | null | The total energy and action, which is stored in the flux-tube between a
static quark-antiquark pair, can be compared with the potential of the pair
with the help of two low energy theorems. The flux-tube and the potential are
calculated in the framework of the model of the stochastic vacuum. Using the
low energy theorems we obtain consistency of the results and can predict the
scale where the model describes the non-perturbative gluon dynamics of QCD.
| [
{
"created": "Wed, 2 Oct 1996 12:36:04 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Rueter",
"Michael",
"",
"ITP Universität Heidelberg"
]
] | The total energy and action, which is stored in the flux-tube between a static quark-antiquark pair, can be compared with the potential of the pair with the help of two low energy theorems. The flux-tube and the potential are calculated in the framework of the model of the stochastic vacuum. Using the low energy theorems we obtain consistency of the results and can predict the scale where the model describes the non-perturbative gluon dynamics of QCD. |
1008.1936 | Thomas Becher | Thomas Becher and Guido Bell | The gluon jet function at two-loop order | 12 pages, 2 figures | Phys.Lett.B695:252-258,2011 | 10.1016/j.physletb.2010.11.036 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The inclusive gluon jet function is evaluated at two-loop accuracy. This
function is relevant for resummations of large perturbative logarithms in
collider processes involving low-mass gluon jets. The jet function corresponds
to the imaginary part of the gluon propagator in light-cone gauge, which is
adopted for the calculation. In addition to the leading jet function, the
power-suppressed two-gluon jet functions are given and their renormalization is
discussed.
| [
{
"created": "Wed, 11 Aug 2010 15:25:54 GMT",
"version": "v1"
}
] | 2011-06-27 | [
[
"Becher",
"Thomas",
""
],
[
"Bell",
"Guido",
""
]
] | The inclusive gluon jet function is evaluated at two-loop accuracy. This function is relevant for resummations of large perturbative logarithms in collider processes involving low-mass gluon jets. The jet function corresponds to the imaginary part of the gluon propagator in light-cone gauge, which is adopted for the calculation. In addition to the leading jet function, the power-suppressed two-gluon jet functions are given and their renormalization is discussed. |
hep-ph/9801291 | M. Rysavy | J. Rizek, V. Brabec, O. Dragoun, M. Rysavy, A. Spalek | A possible origin of the endpoint anomaly in tritium beta-spectrum | 9 pages, no figures. Requires file myown.sty (included) | null | null | NPI Rez - EXP - 01/98 | hep-ph | null | The influence of the residual T atoms appearing after the decay of T_2
molecule on the beta-spectrum shape is considered. Recent experiments performed
in Mainz, Troitsk, and Livermore are briefly reviewed from this viewpoint.
Aspects connected with the possible time dependent change of the tritium source
composition are discussed.
| [
{
"created": "Wed, 14 Jan 1998 08:45:25 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Rizek",
"J.",
""
],
[
"Brabec",
"V.",
""
],
[
"Dragoun",
"O.",
""
],
[
"Rysavy",
"M.",
""
],
[
"Spalek",
"A.",
""
]
] | The influence of the residual T atoms appearing after the decay of T_2 molecule on the beta-spectrum shape is considered. Recent experiments performed in Mainz, Troitsk, and Livermore are briefly reviewed from this viewpoint. Aspects connected with the possible time dependent change of the tritium source composition are discussed. |
1108.1058 | Aqeel Ahmed | Aqeel Ahmed, Ishtiaq Ahmed, M. Ali Paracha, M. Junaid, Abdur Rehman
and M. Jamil Aslam | Comparative Study of B_{c} --> D_{s}^{*}l^{+}l^{-} Decays in Standard
Model and Supersymmetric Models | 32 pages, 7 figures, v3 some typos removed and discussion improved on
FBA | null | null | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A comparative study of the exclusive rare $B_{c}\rightarrow
D_{s}^{\ast}\ell^{+}\ell^{-}$ ($\ell=\mu, \tau$) decays has been made in the
minimal supersymmetric models (MSSM) and the SUSY SO(10) GUT models. In this
context, various physical observables such as branching ratios
$(\mathcal{BR})$, forward-backward asymmetries $(\mathcal{A}_{FB})$, lepton
polarization asymmetries $(P_{L,N,T})$ and helicity fractions ($f_{L,T}$) of
$D_{s}^{\ast}$ meson by using the the QCD sum rules form factors have been
investigated. It is found that the SUSY effects are characteristically
prominent to that of the SM values for these observables. For instance, in SUSY
I and SUSY II, the forward-backward asymmetry does not cross zero which is
mainly due to the same sign of the $C_{7}^{eff}$ and $C_{9}^{eff}$ Wilson
coefficients. Similarly in SUSY SO(10) GUT models due to the complex nature of
the new Wilson coefficients -- corresponding to the new operators arising due
to the contribution of neutral Higgs bosons (NHBs) -- the above mentioned
observables are sizably affected. Therefore the analysis of said observables in
charmed semileptonic $B$ meson decays can put some stringent constraints on the
parameter space of SUSY variants and can serve as a windowpane to look beyond
the SM.
| [
{
"created": "Thu, 4 Aug 2011 12:15:04 GMT",
"version": "v1"
},
{
"created": "Thu, 22 Sep 2011 10:16:35 GMT",
"version": "v2"
},
{
"created": "Thu, 24 Nov 2011 13:16:28 GMT",
"version": "v3"
}
] | 2011-11-28 | [
[
"Ahmed",
"Aqeel",
""
],
[
"Ahmed",
"Ishtiaq",
""
],
[
"Paracha",
"M. Ali",
""
],
[
"Junaid",
"M.",
""
],
[
"Rehman",
"Abdur",
""
],
[
"Aslam",
"M. Jamil",
""
]
] | A comparative study of the exclusive rare $B_{c}\rightarrow D_{s}^{\ast}\ell^{+}\ell^{-}$ ($\ell=\mu, \tau$) decays has been made in the minimal supersymmetric models (MSSM) and the SUSY SO(10) GUT models. In this context, various physical observables such as branching ratios $(\mathcal{BR})$, forward-backward asymmetries $(\mathcal{A}_{FB})$, lepton polarization asymmetries $(P_{L,N,T})$ and helicity fractions ($f_{L,T}$) of $D_{s}^{\ast}$ meson by using the the QCD sum rules form factors have been investigated. It is found that the SUSY effects are characteristically prominent to that of the SM values for these observables. For instance, in SUSY I and SUSY II, the forward-backward asymmetry does not cross zero which is mainly due to the same sign of the $C_{7}^{eff}$ and $C_{9}^{eff}$ Wilson coefficients. Similarly in SUSY SO(10) GUT models due to the complex nature of the new Wilson coefficients -- corresponding to the new operators arising due to the contribution of neutral Higgs bosons (NHBs) -- the above mentioned observables are sizably affected. Therefore the analysis of said observables in charmed semileptonic $B$ meson decays can put some stringent constraints on the parameter space of SUSY variants and can serve as a windowpane to look beyond the SM. |
0906.2936 | Michael Strickland | Jens O. Andersen, Michael Strickland, and Nan Su | Three-loop HTL Free Energy for QED | 23 pages, 10 figures; v3 - typos corrected, additional discussions of
systematics added; corresponds with published version | Phys.Rev.D80:085015,2009 | 10.1103/PhysRevD.80.085015 | null | hep-ph hep-th nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We calculate the free energy of a hot gas of electrons and photons to three
loops using the hard-thermal-loop perturbation theory reorganization of
finite-temperature perturbation theory. We calculate the free energy through
three loops by expanding in a power series in m_D/T, m_f/T, and e^2, where m_D
and m_f are thermal masses and e is the coupling constant. We demonstrate that
the hard-thermal-loop perturbation reorganization improves the convergence of
the successive approximations to the QED free energy at large coupling, e ~ 2.
The reorganization is gauge invariant by construction, and due to cancellation
among various contributions, we obtain a completely analytic result for the
resummed thermodynamic potential at three loops. Finally, we compare our result
with similar calculations that use the Phi-derivable approach.
| [
{
"created": "Tue, 16 Jun 2009 13:59:05 GMT",
"version": "v1"
},
{
"created": "Tue, 7 Jul 2009 11:34:44 GMT",
"version": "v2"
},
{
"created": "Wed, 14 Oct 2009 20:17:11 GMT",
"version": "v3"
}
] | 2009-10-29 | [
[
"Andersen",
"Jens O.",
""
],
[
"Strickland",
"Michael",
""
],
[
"Su",
"Nan",
""
]
] | We calculate the free energy of a hot gas of electrons and photons to three loops using the hard-thermal-loop perturbation theory reorganization of finite-temperature perturbation theory. We calculate the free energy through three loops by expanding in a power series in m_D/T, m_f/T, and e^2, where m_D and m_f are thermal masses and e is the coupling constant. We demonstrate that the hard-thermal-loop perturbation reorganization improves the convergence of the successive approximations to the QED free energy at large coupling, e ~ 2. The reorganization is gauge invariant by construction, and due to cancellation among various contributions, we obtain a completely analytic result for the resummed thermodynamic potential at three loops. Finally, we compare our result with similar calculations that use the Phi-derivable approach. |
2204.05962 | Matthew Kirk | Andreas Crivellin, Matthew Kirk, Teppei Kitahara and Federico Mescia | Large $t\to cZ$ as a Sign of Vector-Like Quarks in Light of the $W$ Mass | 8 pages, 2 figures + supplemental material. v2: Accepted to PRD,
discussion of future lepton colliders added, units corrected in eq II.9,
further references added | Phys. Rev. D 106, L031704 (2022) | 10.1103/PhysRevD.106.L031704 | PSI-PR-22-09, ZU-TH-12/22, KEK-TH-2411 | hep-ph hep-ex hep-th | http://creativecommons.org/licenses/by/4.0/ | The rare flavour changing top quark decay $t\to cZ$ is a clear sign of new
physics and experimentally very interesting due to the huge number of top
quarks produced at the LHC. However, there are few (viable) models which can
generate a sizable branching ratio for $t\to cZ$ -- in fact vector-like quarks
seem to be the only realistic option. In this paper, we investigate all three
representations (under the Standard Model gauge group) of vector-like quarks
($U$, $Q_1$ and $Q_7$) that can generate a sizable branching ratio for $t\to
cZ$ without violating bounds from $B$ physics. Importantly, these are exactly
the three vector-like quarks which can lead to a sizable positive shift in the
prediction for $W$ mass, via the couplings to the top quark also needed for a
sizable Br($t\to cZ$). Calculating and using the one-loop matching of
vector-like quarks on the Standard Model Effective Field Theory, we find that
Br($t\to cZ$) can be of the order of $10^{-6}$, $10^{-5}$ and $10^{-4}$ for
$U$, $Q_1$ and $Q_7$, respectively and that in all three cases the large $W$
mass measurement can be accommodated.
| [
{
"created": "Tue, 12 Apr 2022 17:24:34 GMT",
"version": "v1"
},
{
"created": "Fri, 12 Aug 2022 13:31:53 GMT",
"version": "v2"
}
] | 2022-08-18 | [
[
"Crivellin",
"Andreas",
""
],
[
"Kirk",
"Matthew",
""
],
[
"Kitahara",
"Teppei",
""
],
[
"Mescia",
"Federico",
""
]
] | The rare flavour changing top quark decay $t\to cZ$ is a clear sign of new physics and experimentally very interesting due to the huge number of top quarks produced at the LHC. However, there are few (viable) models which can generate a sizable branching ratio for $t\to cZ$ -- in fact vector-like quarks seem to be the only realistic option. In this paper, we investigate all three representations (under the Standard Model gauge group) of vector-like quarks ($U$, $Q_1$ and $Q_7$) that can generate a sizable branching ratio for $t\to cZ$ without violating bounds from $B$ physics. Importantly, these are exactly the three vector-like quarks which can lead to a sizable positive shift in the prediction for $W$ mass, via the couplings to the top quark also needed for a sizable Br($t\to cZ$). Calculating and using the one-loop matching of vector-like quarks on the Standard Model Effective Field Theory, we find that Br($t\to cZ$) can be of the order of $10^{-6}$, $10^{-5}$ and $10^{-4}$ for $U$, $Q_1$ and $Q_7$, respectively and that in all three cases the large $W$ mass measurement can be accommodated. |
hep-ph/9910441 | Richard Easther | Richard Easther (Brown U.) and Matthew Parry (Imperial College) | Gravity, Parametric Resonance and Chaotic Inflation | 16 pages, uses epsf to import postscript figures (minor changes -
typos fixed, extra reference added and data analysis slightly expanded) | Phys.Rev. D62 (2000) 103503 | 10.1103/PhysRevD.62.103503 | BROWN-HET-1152 Imperial/TP/99-0/004 | hep-ph astro-ph gr-qc | null | We investigate the possibility that nonlinear gravitational effects influence
the preheating era after inflation. Our work is based on numerical solutions of
the inhomogeneous Einstein field equations, and is free of perturbative
approximations. The one restriction we impose is to limit the inhomogeneity to
a single spatial direction. We compare our results to perturbative calculations
and to solutions of the nonlinear field equations in a rigid (unperturbed)
spacetime, in order to isolate gravitational phenomena. We consider two types
of initial conditions: where only one mode of the field perturbation has a
non-zero initial amplitude, and where all the modes begin with a non-zero
amplitude. Here we focus on preheating following inflation driven by a scalar
field with a quartic potential. We confirm the broad picture of preheating
obtained from the nonlinear field equations in a rigid background, but
gravitational effects have a measurable impact on the dynamics for both sets of
initial data. The rigid spacetime results predict that the amplitude of a
single initially excited mode drops rapidly after resonance ends, whereas in
the relativistic case the amplitude is roughly constant. With all modes
initially excited, the longest modes in the simulation grow much more rapidly
in the relativistic calculation than with a rigid background. However, we see
no evidence for the sort of gravitational collapse associated with the
formation of primordial black holes. The numerical codes described here are
easily extended to more complicated resonant models, which we will examine in
the future.
| [
{
"created": "Fri, 22 Oct 1999 20:35:58 GMT",
"version": "v1"
},
{
"created": "Sat, 23 Oct 1999 18:03:56 GMT",
"version": "v2"
},
{
"created": "Tue, 25 Jul 2000 01:40:31 GMT",
"version": "v3"
}
] | 2009-10-31 | [
[
"Easther",
"Richard",
"",
"Brown U."
],
[
"Parry",
"Matthew",
"",
"Imperial College"
]
] | We investigate the possibility that nonlinear gravitational effects influence the preheating era after inflation. Our work is based on numerical solutions of the inhomogeneous Einstein field equations, and is free of perturbative approximations. The one restriction we impose is to limit the inhomogeneity to a single spatial direction. We compare our results to perturbative calculations and to solutions of the nonlinear field equations in a rigid (unperturbed) spacetime, in order to isolate gravitational phenomena. We consider two types of initial conditions: where only one mode of the field perturbation has a non-zero initial amplitude, and where all the modes begin with a non-zero amplitude. Here we focus on preheating following inflation driven by a scalar field with a quartic potential. We confirm the broad picture of preheating obtained from the nonlinear field equations in a rigid background, but gravitational effects have a measurable impact on the dynamics for both sets of initial data. The rigid spacetime results predict that the amplitude of a single initially excited mode drops rapidly after resonance ends, whereas in the relativistic case the amplitude is roughly constant. With all modes initially excited, the longest modes in the simulation grow much more rapidly in the relativistic calculation than with a rigid background. However, we see no evidence for the sort of gravitational collapse associated with the formation of primordial black holes. The numerical codes described here are easily extended to more complicated resonant models, which we will examine in the future. |
hep-ph/9710370 | Robert D. Pisarski | Robert D. Pisarski | Nonabelian Debye screening, tsunami waves, and worldline fermions | 16 pages, LaTeX, requires crckapb.sty. To appear in the proceedings
of the International School of Astrophysics ``D. Chalonge'', Erice, Italy,
Sept. 4-15, 1997; also based on a talk given at the RIKEN BNL Workshop on
``Non-equilibrium many body dynamics'', Upton, N.Y., Sept. 23-25, 1997 | null | null | null | hep-ph | null | I give a pedagogical review of the derivation for the effective lagrangian
for nonabelian Debye screening, or hard thermal loops. Following Kelly, Liu,
Lucchesi, and Manuel, I give the simplest derivation possible, using classical
kinetic theory.
The result is valid not just for a thermal, but for an arbitrary initial
distributions. I use this to study the evolution, at short times, of a gluonic
``tsunami wave''.
I also suggest how classical kinetic theory may arise at one loop order.
Using the wordline representation of the one loop effective action, I follow
D'Hoker and Gagn\'{e} to replace the Wilson line by an integral over worldline
fermions. A bilinear of these worldline fermions naturally defines a nonabelian
charge, whose equation of motion is Wong's equation.
| [
{
"created": "Wed, 15 Oct 1997 20:22:33 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Pisarski",
"Robert D.",
""
]
] | I give a pedagogical review of the derivation for the effective lagrangian for nonabelian Debye screening, or hard thermal loops. Following Kelly, Liu, Lucchesi, and Manuel, I give the simplest derivation possible, using classical kinetic theory. The result is valid not just for a thermal, but for an arbitrary initial distributions. I use this to study the evolution, at short times, of a gluonic ``tsunami wave''. I also suggest how classical kinetic theory may arise at one loop order. Using the wordline representation of the one loop effective action, I follow D'Hoker and Gagn\'{e} to replace the Wilson line by an integral over worldline fermions. A bilinear of these worldline fermions naturally defines a nonabelian charge, whose equation of motion is Wong's equation. |
1112.3112 | Zhi-zhong Xing | Zhi-zhong Xing, He Zhang, Shun Zhou | Impacts of the Higgs mass on vacuum stability, running fermion masses
and two-body Higgs decays | RevTex 14 pages, 4 figures; the treatment of vacuum stability
improved, references updated | null | 10.1103/PhysRevD.86.013013 | null | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The latest results of the ATLAS and CMS experiments indicate 116 GeV \lesssim
M_H \lesssim 131 GeV and 115 GeV \lesssim M_H \lesssim 127 GeV, respectively,
for the mass of the Higgs boson in the standard model (SM) at the 95%
confidence level. In particular, both experiments point to a preferred narrow
mass range M_H \simeq (124 ... 126) GeV. We examine the impact of this
preliminary result of M_H on the SM vacuum stability by using the two-loop
renormalization-group equations (RGEs), and arrive at the cutoff scale
\Lambda_VS \sim 4 \times 10^{12} GeV (for M_H = 125 GeV, M_t = 172.9 GeV and
\alpha_s(M_Z) = 0.1184) where the absolute stability of the SM vacuum is lost
and some kind of new physics might take effect. We update the values of running
lepton and quark masses at some typical energy scales, including the ones
characterized by M_H, 1 TeV and \Lambda_VS, with the help of the two-loop RGEs.
The branching ratios of some important two-body Higgs decay modes, such as H
\to b\bar{b}, H \to \tau^+ \tau^-, H\to \gamma\gamma, H\to W^+ W^- and H \to Z
Z, are also recalculated by inputting the values of relevant particle masses at
M_H.
| [
{
"created": "Wed, 14 Dec 2011 04:12:15 GMT",
"version": "v1"
},
{
"created": "Tue, 15 May 2012 09:23:30 GMT",
"version": "v2"
}
] | 2015-06-03 | [
[
"Xing",
"Zhi-zhong",
""
],
[
"Zhang",
"He",
""
],
[
"Zhou",
"Shun",
""
]
] | The latest results of the ATLAS and CMS experiments indicate 116 GeV \lesssim M_H \lesssim 131 GeV and 115 GeV \lesssim M_H \lesssim 127 GeV, respectively, for the mass of the Higgs boson in the standard model (SM) at the 95% confidence level. In particular, both experiments point to a preferred narrow mass range M_H \simeq (124 ... 126) GeV. We examine the impact of this preliminary result of M_H on the SM vacuum stability by using the two-loop renormalization-group equations (RGEs), and arrive at the cutoff scale \Lambda_VS \sim 4 \times 10^{12} GeV (for M_H = 125 GeV, M_t = 172.9 GeV and \alpha_s(M_Z) = 0.1184) where the absolute stability of the SM vacuum is lost and some kind of new physics might take effect. We update the values of running lepton and quark masses at some typical energy scales, including the ones characterized by M_H, 1 TeV and \Lambda_VS, with the help of the two-loop RGEs. The branching ratios of some important two-body Higgs decay modes, such as H \to b\bar{b}, H \to \tau^+ \tau^-, H\to \gamma\gamma, H\to W^+ W^- and H \to Z Z, are also recalculated by inputting the values of relevant particle masses at M_H. |
hep-ph/0212276 | Peter Tandy | M. Bhagwat, M. A. Pichowsky and P. C. Tandy (Kent State University,
USA) | Confinement Phenomenology in the Bethe-Salpeter Equation | Submitted for publication; 10.5x2-column pages, REVTEX 4, 3
postscript files making 3 figs | Phys.Rev. D67 (2003) 054019 | 10.1103/PhysRevD.67.054019 | null | hep-ph nucl-th | null | We consider the solution of the Bethe-Salpeter equation in Euclidean metric
for a qbar-q vector meson in the circumstance where the dressed quark
propagators have time-like complex conjugate mass poles. This approximates
features encountered in recent QCD modeling via the Dyson-Schwinger equations;
the absence of real mass poles simulates quark confinement. The analytic
continuation in the total momentum necessary to reach the mass shell for a
meson sufficiently heavier than 1 GeV leads to the quark poles being within the
integration domain for two variables in the standard approach. Through Feynman
integral techniques, we show how the analytic continuation can be implemented
in a way suitable for a practical numerical solution. We show that the would-be
qbar-q width to the meson generated from one quark pole is exactly cancelled by
the effect of the conjugate partner pole; the meson mass remains real and there
is no spurious qbar-q production threshold. The ladder kernel we employ is
consistent with one-loop perturbative QCD and has a two-parameter infrared
structure found to be successful in recent studies of the light SU(3) meson
sector.
| [
{
"created": "Wed, 18 Dec 2002 22:36:22 GMT",
"version": "v1"
}
] | 2009-11-07 | [
[
"Bhagwat",
"M.",
"",
"Kent State University,\n USA"
],
[
"Pichowsky",
"M. A.",
"",
"Kent State University,\n USA"
],
[
"Tandy",
"P. C.",
"",
"Kent State University,\n USA"
]
] | We consider the solution of the Bethe-Salpeter equation in Euclidean metric for a qbar-q vector meson in the circumstance where the dressed quark propagators have time-like complex conjugate mass poles. This approximates features encountered in recent QCD modeling via the Dyson-Schwinger equations; the absence of real mass poles simulates quark confinement. The analytic continuation in the total momentum necessary to reach the mass shell for a meson sufficiently heavier than 1 GeV leads to the quark poles being within the integration domain for two variables in the standard approach. Through Feynman integral techniques, we show how the analytic continuation can be implemented in a way suitable for a practical numerical solution. We show that the would-be qbar-q width to the meson generated from one quark pole is exactly cancelled by the effect of the conjugate partner pole; the meson mass remains real and there is no spurious qbar-q production threshold. The ladder kernel we employ is consistent with one-loop perturbative QCD and has a two-parameter infrared structure found to be successful in recent studies of the light SU(3) meson sector. |
1707.00914 | Umberto D'Alesio | Umberto D'Alesio, Francesco Murgia, Cristian Pisano | Testing the universality of the Collins function in pion-jet production
at RHIC | 10 pages, 5 figures (10 plots); v2: discussion on jet kT dependence
of the SSAs extended and one plot on the corresponding unpolarized cross
section added (Fig. 3, right panel); few comments on factorization breaking
effects and on the universality issue of the Collins function added; three
references added; results unchanged; matches the published version | Phys.Lett. B773 (2017) 300-306 | 10.1016/j.physletb.2017.08.023 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | By adopting a generalised parton model approach at leading order in QCD,
including spin and intrinsic parton motion effects, we study the Collins
azimuthal asymmetries for pions within a large-$p_T$ jet produced at
mid-rapidity in polarised hadronic collisions. Using available information on
the quark transversity distributions and the pion Collins functions, as
extracted from semi-inclusive deeply inelastic scattering and $e^+e^-\to h_1
h_2\, X$ processes, we compute estimates for the Collins asymmetries in
kinematical configurations presently investigated at RHIC by the STAR
Collaboration. Collins-like asymmetries, involving linearly polarised gluons,
are also considered. Our predictions, compared against available preliminary
data, show a very good agreement, even if some discrepancies, to be further
scrutinized both theoretically and experimentally, appear in the transverse
momentum dependence of the Collins asymmetry. These results are in favour of
the predicted universality of the Collins function and of a mild, if any,
evolution with the hard scale of the asymmetries.
| [
{
"created": "Tue, 4 Jul 2017 11:16:20 GMT",
"version": "v1"
},
{
"created": "Wed, 18 Oct 2017 08:54:07 GMT",
"version": "v2"
}
] | 2017-10-19 | [
[
"D'Alesio",
"Umberto",
""
],
[
"Murgia",
"Francesco",
""
],
[
"Pisano",
"Cristian",
""
]
] | By adopting a generalised parton model approach at leading order in QCD, including spin and intrinsic parton motion effects, we study the Collins azimuthal asymmetries for pions within a large-$p_T$ jet produced at mid-rapidity in polarised hadronic collisions. Using available information on the quark transversity distributions and the pion Collins functions, as extracted from semi-inclusive deeply inelastic scattering and $e^+e^-\to h_1 h_2\, X$ processes, we compute estimates for the Collins asymmetries in kinematical configurations presently investigated at RHIC by the STAR Collaboration. Collins-like asymmetries, involving linearly polarised gluons, are also considered. Our predictions, compared against available preliminary data, show a very good agreement, even if some discrepancies, to be further scrutinized both theoretically and experimentally, appear in the transverse momentum dependence of the Collins asymmetry. These results are in favour of the predicted universality of the Collins function and of a mild, if any, evolution with the hard scale of the asymmetries. |
2211.04806 | Ernesto Arganda | Ernesto Arganda, Andres D. Perez, Martin de los Rios, Rosa Mar\'ia
Sand\'a Seoane | Machine-Learned Exclusion Limits without Binning | 24 pages, 8 figures, 3 tables, 1 appendix (version published in
EPJC). MLL+KDE code available from
https://github.com/AndresDanielPerez/2211.04806-ML-Likelihood-with-KDE | null | null | IFT-UAM/CSIC-22-134 | hep-ph cs.LG hep-ex physics.data-an stat.ML | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Machine-Learned Likelihoods (MLL) combines machine-learning classification
techniques with likelihood-based inference tests to estimate the experimental
sensitivity of high-dimensional data sets. We extend the MLL method by
including Kernel Density Estimators (KDE) to avoid binning the classifier
output to extract the resulting one-dimensional signal and background
probability density functions. We first test our method on toy models generated
with multivariate Gaussian distributions, where the true probability
distribution functions are known. Later, we apply the method to two cases of
interest at the LHC: a search for exotic Higgs bosons, and a $Z'$ boson
decaying into lepton pairs. In contrast to physical-based quantities, the
typical fluctuations of the ML outputs give non-smooth probability
distributions for pure-signal and pure-background samples. The non-smoothness
is propagated into the density estimation due to the good performance and
flexibility of the KDE method. We study its impact on the final significance
computation, and we compare the results using the average of several
independent ML output realizations, which allows us to obtain smoother
distributions. We conclude that the significance estimation turns out to be not
sensible to this issue.
| [
{
"created": "Wed, 9 Nov 2022 11:04:50 GMT",
"version": "v1"
},
{
"created": "Fri, 15 Dec 2023 11:40:58 GMT",
"version": "v2"
}
] | 2023-12-18 | [
[
"Arganda",
"Ernesto",
""
],
[
"Perez",
"Andres D.",
""
],
[
"Rios",
"Martin de los",
""
],
[
"Seoane",
"Rosa María Sandá",
""
]
] | Machine-Learned Likelihoods (MLL) combines machine-learning classification techniques with likelihood-based inference tests to estimate the experimental sensitivity of high-dimensional data sets. We extend the MLL method by including Kernel Density Estimators (KDE) to avoid binning the classifier output to extract the resulting one-dimensional signal and background probability density functions. We first test our method on toy models generated with multivariate Gaussian distributions, where the true probability distribution functions are known. Later, we apply the method to two cases of interest at the LHC: a search for exotic Higgs bosons, and a $Z'$ boson decaying into lepton pairs. In contrast to physical-based quantities, the typical fluctuations of the ML outputs give non-smooth probability distributions for pure-signal and pure-background samples. The non-smoothness is propagated into the density estimation due to the good performance and flexibility of the KDE method. We study its impact on the final significance computation, and we compare the results using the average of several independent ML output realizations, which allows us to obtain smoother distributions. We conclude that the significance estimation turns out to be not sensible to this issue. |
1812.06235 | Thomas W. Kephart | Bradley L. Rachlin and Thomas W. Kephart | A Gauged Flavor Model of Quarks and Leptons | 23 pages, 2 figures | null | null | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Beyond Standard Model physics frequently connects flavor symmetry with a
discrete group. If the discrete symmetry arises spontaneously from a gauge
theory, one can maintain compatibility with quantum gravity and avoid
anomalies. We provide an example of such a model with the Standard Model gauge
group extended to $SU(3)_C \times SU(2)_L \times U(1)_Y \times SU(2)_{T'} $
where the binary tetrahedral flavor group $T'$ is embedded in $SU(2)_{T'}$.
Quark and lepton masses and mixing angles are fit to data, where lepton mixing
angles are shifted from tribimaximal values by the addition of scalar VEVs to
agree with the experimental data.
| [
{
"created": "Sat, 15 Dec 2018 05:27:10 GMT",
"version": "v1"
}
] | 2018-12-18 | [
[
"Rachlin",
"Bradley L.",
""
],
[
"Kephart",
"Thomas W.",
""
]
] | Beyond Standard Model physics frequently connects flavor symmetry with a discrete group. If the discrete symmetry arises spontaneously from a gauge theory, one can maintain compatibility with quantum gravity and avoid anomalies. We provide an example of such a model with the Standard Model gauge group extended to $SU(3)_C \times SU(2)_L \times U(1)_Y \times SU(2)_{T'} $ where the binary tetrahedral flavor group $T'$ is embedded in $SU(2)_{T'}$. Quark and lepton masses and mixing angles are fit to data, where lepton mixing angles are shifted from tribimaximal values by the addition of scalar VEVs to agree with the experimental data. |
0911.4668 | Anosh Joseph | Anosh Joseph, Mark Trodden | Vortex Scattering and Intercommuting Cosmic Strings on a Noncommutative
Spacetime | 18 pages, 2 figures | null | 10.1103/PhysRevD.81.043536 | SU-4252-900 | hep-ph astro-ph.CO hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the scattering of noncommutative vortices, based on the
noncommutative field theory developed in [Phys. Rev. D 75, 045009 (2007)], as a
way to understand the interaction of cosmic strings. In the center-of-mass
frame, the effects of noncommutativity vanish, and therefore the reconnection
of cosmic strings occurs in an identical manner to the commutative case.
However, when scattering occurs in a frame other than the center-of-mass frame,
strings still reconnect but the well known 90-degree scattering no longer need
correspond to the head on collision of the strings, due to the breakdown of
Lorentz invariance in the underlying noncommutative field theory.
| [
{
"created": "Tue, 24 Nov 2009 16:30:16 GMT",
"version": "v1"
}
] | 2015-05-14 | [
[
"Joseph",
"Anosh",
""
],
[
"Trodden",
"Mark",
""
]
] | We study the scattering of noncommutative vortices, based on the noncommutative field theory developed in [Phys. Rev. D 75, 045009 (2007)], as a way to understand the interaction of cosmic strings. In the center-of-mass frame, the effects of noncommutativity vanish, and therefore the reconnection of cosmic strings occurs in an identical manner to the commutative case. However, when scattering occurs in a frame other than the center-of-mass frame, strings still reconnect but the well known 90-degree scattering no longer need correspond to the head on collision of the strings, due to the breakdown of Lorentz invariance in the underlying noncommutative field theory. |
2005.13687 | Robinson Longas | Alexandra Gaviria, Robinson Longas, Andr\'es Rivera | Lepton dark matter portal in the inert Zee model | 14 pages, 5 figures | null | 10.1142/S0217751X20501900 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The inert Zee model is an extension of the Zee model for neutrino masses.
This new model explains the dark matter relic abundance, generates a one-loop
neutrino masses and forbids tree-level Higgs-mediated flavor changing neutral
currents. Although the dark matter phenomenology of the model is similar to
that of the inert doublet model, the presence of new vector-like fermions opens
the lepton portal as a new dark matter annihilation channel. We study the
impact of such a new portal in the low mass regime and show the parameter space
allowed by direct and indirect searches of dark matter. Remarkably, we show
that the region for $m_{H^0} \lesssim$ 70 GeV is recovered for $\lambda_L
\lesssim 10^{-3}$. We also show that future experiments like LZ and DARWIN
could test a large region of the parameter space of the model.
| [
{
"created": "Wed, 27 May 2020 22:27:11 GMT",
"version": "v1"
},
{
"created": "Wed, 17 Feb 2021 00:38:42 GMT",
"version": "v2"
}
] | 2021-02-18 | [
[
"Gaviria",
"Alexandra",
""
],
[
"Longas",
"Robinson",
""
],
[
"Rivera",
"Andrés",
""
]
] | The inert Zee model is an extension of the Zee model for neutrino masses. This new model explains the dark matter relic abundance, generates a one-loop neutrino masses and forbids tree-level Higgs-mediated flavor changing neutral currents. Although the dark matter phenomenology of the model is similar to that of the inert doublet model, the presence of new vector-like fermions opens the lepton portal as a new dark matter annihilation channel. We study the impact of such a new portal in the low mass regime and show the parameter space allowed by direct and indirect searches of dark matter. Remarkably, we show that the region for $m_{H^0} \lesssim$ 70 GeV is recovered for $\lambda_L \lesssim 10^{-3}$. We also show that future experiments like LZ and DARWIN could test a large region of the parameter space of the model. |
1112.6261 | Sven Bjarke Gudnason | Roberto Auzzi, Amit Giveon, Sven Bjarke Gudnason | Flavor of quiver-like realizations of effective supersymmetry | LaTeX, 17 pages, 3 figures. V2: reference added | JHEP 1202:069,2012 | 10.1007/JHEP02(2012)069 | null | hep-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present a class of supersymmetric models which address the flavor puzzle
and have an inverted hierarchy of sfermions. Their construction involves
quiver-like models with link fields in generic representations. The magnitude
of Standard-Model parameters is obtained naturally and a relatively heavy Higgs
boson is allowed without fine tuning. Collider signatures of such models are
possibly within the reach of LHC in the near future.
| [
{
"created": "Thu, 29 Dec 2011 09:55:41 GMT",
"version": "v1"
},
{
"created": "Tue, 31 Jan 2012 15:11:26 GMT",
"version": "v2"
}
] | 2012-03-02 | [
[
"Auzzi",
"Roberto",
""
],
[
"Giveon",
"Amit",
""
],
[
"Gudnason",
"Sven Bjarke",
""
]
] | We present a class of supersymmetric models which address the flavor puzzle and have an inverted hierarchy of sfermions. Their construction involves quiver-like models with link fields in generic representations. The magnitude of Standard-Model parameters is obtained naturally and a relatively heavy Higgs boson is allowed without fine tuning. Collider signatures of such models are possibly within the reach of LHC in the near future. |
hep-ph/0608284 | Harry Lipkin J | Harry J. Lipkin | CP violation difference in $B^o$ and $B^\pm$ decays explained No
tree-penguin interference in $B^+ \to K^+\pi^o$ | 10 pages | null | null | WIS/14/06-SEPT-DPP,TAUP 2834/06,ANL-HEP-PR-06-63 | hep-ph | null | A new experimental analysis of $B\to K\pi$ decays provides finite
experimental values for the contributions from interference terms between the
dominant penguin amplitude and the color-favored and color-suppressed tree
amplitudes. These results can explain the puzzling failure to see CP violation
in $B^\pm\to K\pi$ decays. Tree-penguin interference contributions are commonly
believed to be the source of the observed direct CP violation in $B^o\to
K^\pm\pi^\mp$ decays. The data show that the color-favored and color-suppressed
tree contributions interfere destructively in $B^\pm\to K^\pm\pi^o$ decays and
nearly cancel. This suprising cancellation is not predicted by present theory.
There is also no prediction for any difference produced by changing the flavor
of the spectator quark. Isospin and Pauli effects that change with spectator
quark flavor are examined and show using group theory and the color-spun SU(6)
algebra how they produce both the near cancellation and the dependence on
spectator quark flavor. The standard $B\to K\pi$ analysis which treats
tree-penguin interference only in first order has three parameters
overdetermined by four experimental branching ratios. Previous analyses
confirmed the model but with large errors leaving the values of tree-penguin
interference contributions less that two standard deviations from zero. The new
analysis finds interference contributions well above the errors.
| [
{
"created": "Fri, 25 Aug 2006 16:22:33 GMT",
"version": "v1"
},
{
"created": "Wed, 6 Sep 2006 07:23:26 GMT",
"version": "v2"
},
{
"created": "Mon, 25 Sep 2006 17:30:17 GMT",
"version": "v3"
}
] | 2007-05-23 | [
[
"Lipkin",
"Harry J.",
""
]
] | A new experimental analysis of $B\to K\pi$ decays provides finite experimental values for the contributions from interference terms between the dominant penguin amplitude and the color-favored and color-suppressed tree amplitudes. These results can explain the puzzling failure to see CP violation in $B^\pm\to K\pi$ decays. Tree-penguin interference contributions are commonly believed to be the source of the observed direct CP violation in $B^o\to K^\pm\pi^\mp$ decays. The data show that the color-favored and color-suppressed tree contributions interfere destructively in $B^\pm\to K^\pm\pi^o$ decays and nearly cancel. This suprising cancellation is not predicted by present theory. There is also no prediction for any difference produced by changing the flavor of the spectator quark. Isospin and Pauli effects that change with spectator quark flavor are examined and show using group theory and the color-spun SU(6) algebra how they produce both the near cancellation and the dependence on spectator quark flavor. The standard $B\to K\pi$ analysis which treats tree-penguin interference only in first order has three parameters overdetermined by four experimental branching ratios. Previous analyses confirmed the model but with large errors leaving the values of tree-penguin interference contributions less that two standard deviations from zero. The new analysis finds interference contributions well above the errors. |
2211.05240 | Qiang Li | Dawei Fu, Alim Ruzi, Meng Lu, and Qiang Li | New methods to achieve meson, muon and gamma light sources through
asymmetric electron positron collisions | Published in Int.J.Mod.Phys.A 38 (2023) 04n05, 2350033 | null | 10.1142/S0217751X23500331 | null | hep-ph hep-ex nucl-ex physics.acc-ph | http://creativecommons.org/licenses/by/4.0/ | We propose methods to produce energetic meson beams such as charged and
neutral Kaons, which are boosted to be collimated and with relatively long life
time. The first type of methods is based on asymmetric electron positron
collisions with a center of mass energy of, e.g., 1020 MeV, and Kaons can be
produced at a rate of $10^{4-5}/s$. The electron and positron beams are either
asymmetric in energy, e.g., 10 GeV electron beam with 26 MeV positron beam, or
asymmetric in space, e.g., 10 GeV electron and positron beams collisions
separated with a angle around 0.05 radius. Such proposals should be able to be
achieved with a reasonable budget. The other type of method is relying on TeV
positron on target experiment, where Kaon beams can be achieved at around
$10^{7}$ per bunch crossing. Such Kaon beams are clean with small
contamination, and can have great physics potential on, e.g., hyperon searches
through Kaon nuclei collision, Kaon rare decay measurement, and Kaon proton or
Kaon lepton collisions. The same technique with very asymmetric electron
positron collisions can also be extended to other final states such as pions
and tau leptons.
| [
{
"created": "Wed, 9 Nov 2022 22:22:36 GMT",
"version": "v1"
},
{
"created": "Sun, 13 Nov 2022 12:06:42 GMT",
"version": "v2"
},
{
"created": "Thu, 17 Nov 2022 07:57:43 GMT",
"version": "v3"
},
{
"created": "Mon, 6 Mar 2023 13:39:42 GMT",
"version": "v4"
},
{
"cre... | 2023-05-10 | [
[
"Fu",
"Dawei",
""
],
[
"Ruzi",
"Alim",
""
],
[
"Lu",
"Meng",
""
],
[
"Li",
"Qiang",
""
]
] | We propose methods to produce energetic meson beams such as charged and neutral Kaons, which are boosted to be collimated and with relatively long life time. The first type of methods is based on asymmetric electron positron collisions with a center of mass energy of, e.g., 1020 MeV, and Kaons can be produced at a rate of $10^{4-5}/s$. The electron and positron beams are either asymmetric in energy, e.g., 10 GeV electron beam with 26 MeV positron beam, or asymmetric in space, e.g., 10 GeV electron and positron beams collisions separated with a angle around 0.05 radius. Such proposals should be able to be achieved with a reasonable budget. The other type of method is relying on TeV positron on target experiment, where Kaon beams can be achieved at around $10^{7}$ per bunch crossing. Such Kaon beams are clean with small contamination, and can have great physics potential on, e.g., hyperon searches through Kaon nuclei collision, Kaon rare decay measurement, and Kaon proton or Kaon lepton collisions. The same technique with very asymmetric electron positron collisions can also be extended to other final states such as pions and tau leptons. |
1104.1894 | Bo-Qiang Ma | Xiao-Gang He, Bo-Qiang Ma | The CDF dijet excess from intrinsic quarks | 4 latex pages, 1 figure. Version for journal publication | Eur. Phys. J. A 47 (2011) 152 | 10.1140/epja/i2011-11152-x | null | hep-ph hep-ex nucl-ex nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The CDF collaboration reported an excess in the production of two jets in
association with a $W$. We discuss constraints on possible new particle state
interpretations of this excess. The fact of no statistically significant
deviation from the SM expectation for {$Z$+dijet} events in CDF data disfavors
the new particle explanation. We show that the nucleon intrinsic strange quarks
provide an important contribution to the $W$ boson production in association
with a single top quark production. Such {$W$+t} single top quark production
can contribute to the CDF {$W$+dijet} excess, thus the nucleon intrinsic quarks
can provide a possible explanation to the CDF excess in {$W$+dijet} but not in
{$Z$+dijet} events.
| [
{
"created": "Mon, 11 Apr 2011 09:53:06 GMT",
"version": "v1"
},
{
"created": "Thu, 1 Dec 2011 06:49:11 GMT",
"version": "v2"
}
] | 2011-12-12 | [
[
"He",
"Xiao-Gang",
""
],
[
"Ma",
"Bo-Qiang",
""
]
] | The CDF collaboration reported an excess in the production of two jets in association with a $W$. We discuss constraints on possible new particle state interpretations of this excess. The fact of no statistically significant deviation from the SM expectation for {$Z$+dijet} events in CDF data disfavors the new particle explanation. We show that the nucleon intrinsic strange quarks provide an important contribution to the $W$ boson production in association with a single top quark production. Such {$W$+t} single top quark production can contribute to the CDF {$W$+dijet} excess, thus the nucleon intrinsic quarks can provide a possible explanation to the CDF excess in {$W$+dijet} but not in {$Z$+dijet} events. |
1902.00307 | Ji Xu | Yu-Sheng Liu, Wei Wang, Ji Xu, Qi-An Zhang, Jian-Hui Zhang, Shuai Zhao
and Yong Zhao | Matching Quasi Generalized Parton Distributions in the RI/MOM scheme | 13 pages, 2 figures | Phys. Rev. D 100, 034006 (2019) | 10.1103/PhysRevD.100.034006 | MIT-CTP/5074, INT-PUB-19-004 | hep-ph hep-lat | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Within the framework of large momentum effective theory (LaMET),
genenaralized parton distributions (GPDs) can be extracted from lattice
calculations of quasi-GPDs through a perturbative matching relation, up to
power corrections that are suppressed by the hadron momentum. In this paper, we
focus on isovector quark GPDs, including the unpolarized, longitudinally and
transversely polarized cases, and present the one-loop matching that connects
the quasi-GPDs renormalized in a regularization-independent momentum
subtraction (RI/MOM) scheme to the GPDs in MS scheme. We find that the matching
coefficient is independent of the momentum transfer squared. As a consequence,
the matching for the quasi-GPD with zero skewness is the same as that for the
quasi-PDF. Our results provide a crucial input for the determination of quark
GPDs from lattice QCD using LaMET.
| [
{
"created": "Fri, 1 Feb 2019 12:46:38 GMT",
"version": "v1"
},
{
"created": "Wed, 31 Jul 2019 19:30:18 GMT",
"version": "v2"
}
] | 2019-08-14 | [
[
"Liu",
"Yu-Sheng",
""
],
[
"Wang",
"Wei",
""
],
[
"Xu",
"Ji",
""
],
[
"Zhang",
"Qi-An",
""
],
[
"Zhang",
"Jian-Hui",
""
],
[
"Zhao",
"Shuai",
""
],
[
"Zhao",
"Yong",
""
]
] | Within the framework of large momentum effective theory (LaMET), genenaralized parton distributions (GPDs) can be extracted from lattice calculations of quasi-GPDs through a perturbative matching relation, up to power corrections that are suppressed by the hadron momentum. In this paper, we focus on isovector quark GPDs, including the unpolarized, longitudinally and transversely polarized cases, and present the one-loop matching that connects the quasi-GPDs renormalized in a regularization-independent momentum subtraction (RI/MOM) scheme to the GPDs in MS scheme. We find that the matching coefficient is independent of the momentum transfer squared. As a consequence, the matching for the quasi-GPD with zero skewness is the same as that for the quasi-PDF. Our results provide a crucial input for the determination of quark GPDs from lattice QCD using LaMET. |
1512.08796 | Abdesslam Arhrib | Abdesslam Arhrib, C\'eline B{\oe}hm, Ernest Ma and Tzu-Chiang Yuan | Radiative Model of Neutrino Mass with Neutrino Interacting MeV Dark
Matter | 34 pages, 4 figures, references added, journal version published in
JCAP | null | 10.1088/1475-7516/2016/04/049 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We consider the radiative generation of neutrino mass through the
interactions of neutrinos with MeV dark matter. We construct a realistic
renormalizable model with one scalar doublet and one complex singlet together
with three light singlet Majorana fermions, all transforming under a dark U(1)
symmetry which breaks softly to Z_2. We study in detail the scalar sector which
supports this specific scenario and its rich phenomenology.
| [
{
"created": "Tue, 29 Dec 2015 21:12:56 GMT",
"version": "v1"
},
{
"created": "Mon, 11 Jan 2016 15:23:20 GMT",
"version": "v2"
},
{
"created": "Thu, 14 Jul 2016 12:04:07 GMT",
"version": "v3"
}
] | 2016-07-15 | [
[
"Arhrib",
"Abdesslam",
""
],
[
"Bœhm",
"Céline",
""
],
[
"Ma",
"Ernest",
""
],
[
"Yuan",
"Tzu-Chiang",
""
]
] | We consider the radiative generation of neutrino mass through the interactions of neutrinos with MeV dark matter. We construct a realistic renormalizable model with one scalar doublet and one complex singlet together with three light singlet Majorana fermions, all transforming under a dark U(1) symmetry which breaks softly to Z_2. We study in detail the scalar sector which supports this specific scenario and its rich phenomenology. |
2110.03228 | Kai Murai | Tomohiro Fujita, Kyohei Mukaida, Kai Murai, and Hiromasa Nakatsuka | SU($N$)-natural inflation | 8 pages, 6 figures | Phys. Rev. D 105, 103519 (2022) | 10.1103/PhysRevD.105.103519 | KEK-TH-2349 | hep-ph astro-ph.CO hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study SU($N$) gauge fields that couple to the inflaton through the
Chern-Simons term. We provide a general procedure to construct homogeneous,
isotropic, and attractor solutions of the gauge fields during inflation. The
gauge fields develop various VEVs corresponding to different spontaneous
symmetry breaking patterns of SU($N$) where embedded SU($2$) subgroups are
broken with the spatial rotation SO($3$) symmetry. As specific examples, we
construct the stable solutions for $N = 3$ and $4$. We also numerically solve
the gauge field dynamics and confirm that our analytic solutions are complete
and attractor. It is straightforward to apply our procedure to the other simple
Lie groups.
| [
{
"created": "Thu, 7 Oct 2021 07:25:00 GMT",
"version": "v1"
},
{
"created": "Thu, 19 May 2022 04:22:50 GMT",
"version": "v2"
}
] | 2022-05-20 | [
[
"Fujita",
"Tomohiro",
""
],
[
"Mukaida",
"Kyohei",
""
],
[
"Murai",
"Kai",
""
],
[
"Nakatsuka",
"Hiromasa",
""
]
] | We study SU($N$) gauge fields that couple to the inflaton through the Chern-Simons term. We provide a general procedure to construct homogeneous, isotropic, and attractor solutions of the gauge fields during inflation. The gauge fields develop various VEVs corresponding to different spontaneous symmetry breaking patterns of SU($N$) where embedded SU($2$) subgroups are broken with the spatial rotation SO($3$) symmetry. As specific examples, we construct the stable solutions for $N = 3$ and $4$. We also numerically solve the gauge field dynamics and confirm that our analytic solutions are complete and attractor. It is straightforward to apply our procedure to the other simple Lie groups. |
hep-ph/0701167 | Hendrik van Hees | Hendrik van Hees and Ralf Rapp | Interpretation of Recent SPS Dilepton Data | To appear in the proceedings of the 19th International Conference on
Ultra-Relativistic Nucleus-Nucleus Collisions (Quark Matter 2006) v2:
references added, minor typos corrected | J.Phys.G34:S1051,2007 | 10.1088/0954-3899/34/8/S154 | null | hep-ph nucl-ex nucl-th | null | We summarize our current theoretical understanding of in-medium properties of
the electromagnetic current correlator in view of recent dimuon data from the
NA60 experiment in In(158 AGeV)-In collisions at the CERN-SPS. We discuss the
sensitivity of the results to space-time evolution models for the hot and dense
partonic and hadronic medium created in relativistic heavy-ion collisions and
the contributions from different sources to the dilepton-excess spectra.
| [
{
"created": "Sat, 20 Jan 2007 02:03:35 GMT",
"version": "v1"
},
{
"created": "Mon, 16 Apr 2007 17:15:30 GMT",
"version": "v2"
}
] | 2008-11-26 | [
[
"van Hees",
"Hendrik",
""
],
[
"Rapp",
"Ralf",
""
]
] | We summarize our current theoretical understanding of in-medium properties of the electromagnetic current correlator in view of recent dimuon data from the NA60 experiment in In(158 AGeV)-In collisions at the CERN-SPS. We discuss the sensitivity of the results to space-time evolution models for the hot and dense partonic and hadronic medium created in relativistic heavy-ion collisions and the contributions from different sources to the dilepton-excess spectra. |
2303.07505 | Selcuk Bilmis | T.M.Aliev, S.Bilmis, M.Savci | The study of weak decays induced by $\frac{1}{2}^+ \to \frac{3}{2}^-$
transition in light-cone sum rules | null | Phys.Lett.B 847 (2023) 138287 | 10.1016/j.physletb.2023.138287 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this study, we analyzed the weak decays induced by $J^P = \frac{1}{2}^{+}
\to \frac{3}{2}^{-} $ transitions within the light-cone sum rules.
Specifically, semileptonic decays of the bottom baryons into the P-wave baryons
$\Lambda_b \to \Lambda_c(2625) \ell \nu_l$ and $\Xi_b \to \Xi_c(2815) \ell
\nu_l$ as well as nonleptonic $\Lambda_b \to \Lambda_c(2625) \pi (\rho)$ and
$\Xi_b \to \Xi_c(2815) \pi (\rho)$ decays are investigated. The form factors
for the considered transitions are obtained within the sum rules method. With
the calculated form factors, the decay widths of the processes are determined.
Up to now, only the decay width for $\Lambda_b^0 \to \Lambda_c^+ \mu^- \nu_\mu$
has been measured among the considered decays, and we observe that our finding
is quite compatible with the measurement. We also compare our results with the
predictions of other approaches.
| [
{
"created": "Mon, 13 Mar 2023 22:30:00 GMT",
"version": "v1"
},
{
"created": "Thu, 16 Nov 2023 13:07:02 GMT",
"version": "v2"
}
] | 2023-11-17 | [
[
"Aliev",
"T. M.",
""
],
[
"Bilmis",
"S.",
""
],
[
"Savci",
"M.",
""
]
] | In this study, we analyzed the weak decays induced by $J^P = \frac{1}{2}^{+} \to \frac{3}{2}^{-} $ transitions within the light-cone sum rules. Specifically, semileptonic decays of the bottom baryons into the P-wave baryons $\Lambda_b \to \Lambda_c(2625) \ell \nu_l$ and $\Xi_b \to \Xi_c(2815) \ell \nu_l$ as well as nonleptonic $\Lambda_b \to \Lambda_c(2625) \pi (\rho)$ and $\Xi_b \to \Xi_c(2815) \pi (\rho)$ decays are investigated. The form factors for the considered transitions are obtained within the sum rules method. With the calculated form factors, the decay widths of the processes are determined. Up to now, only the decay width for $\Lambda_b^0 \to \Lambda_c^+ \mu^- \nu_\mu$ has been measured among the considered decays, and we observe that our finding is quite compatible with the measurement. We also compare our results with the predictions of other approaches. |
2007.01765 | Dimitrios K. Papoulias | O. G. Miranda, D. K. Papoulias, M. T\'ortola, J. W. F. Valle | XENON1T signal from transition neutrino magnetic moments | 10 pages, 3 figures, 1 table. V2: Fig.1 updated, references added,
matches published version | Phys.Lett. B 808 (2020) 135685 | 10.1016/j.physletb.2020.135685 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The recent puzzling results of the XENON1T collaboration at few keV
electronic recoils could be due to the scattering of solar neutrinos endowed
with finite Majorana transition magnetic moments (TMMs). Within such general
formalism, we find that the observed excess in the XENON1T data agrees well
with this interpretation. The required TMM strengths lie within the limits set
by current experiments, such as Borexino, specially when one takes into account
a possible tritium contamination.
| [
{
"created": "Fri, 3 Jul 2020 15:41:28 GMT",
"version": "v1"
},
{
"created": "Fri, 14 Aug 2020 21:15:49 GMT",
"version": "v2"
}
] | 2020-08-18 | [
[
"Miranda",
"O. G.",
""
],
[
"Papoulias",
"D. K.",
""
],
[
"Tórtola",
"M.",
""
],
[
"Valle",
"J. W. F.",
""
]
] | The recent puzzling results of the XENON1T collaboration at few keV electronic recoils could be due to the scattering of solar neutrinos endowed with finite Majorana transition magnetic moments (TMMs). Within such general formalism, we find that the observed excess in the XENON1T data agrees well with this interpretation. The required TMM strengths lie within the limits set by current experiments, such as Borexino, specially when one takes into account a possible tritium contamination. |
hep-ph/9511223 | Shoichi Midorikawa | M. Honda, T. Kajita, K. Kasahara, and S. Midorikawa | Atmospheric Neutrinos | 8 pages, PTPTEX.sty, to appear in Proceedings of YKIS '95, From the
Standard Model to Grand Unified Theories | Prog.Theor.Phys.Suppl.123:483-490,1996 | 10.1143/PTPS.123.483 | null | hep-ph | null | The atmospheric neutrino-flux is calculated over the wide energy range from 1
GeV to 3,000 GeV for the study of neutrino-physics using the data from
underground neutrino-detectors. The uncertainty of atmospheric neutrino-flux is
also discussed. A brief comment is made to interpret the anomaly in terms of
neutrino oscillations.
| [
{
"created": "Fri, 3 Nov 1995 07:16:24 GMT",
"version": "v1"
},
{
"created": "Sat, 4 Nov 1995 04:18:11 GMT",
"version": "v2"
},
{
"created": "Mon, 6 Nov 1995 08:44:49 GMT",
"version": "v3"
}
] | 2011-04-15 | [
[
"Honda",
"M.",
""
],
[
"Kajita",
"T.",
""
],
[
"Kasahara",
"K.",
""
],
[
"Midorikawa",
"S.",
""
]
] | The atmospheric neutrino-flux is calculated over the wide energy range from 1 GeV to 3,000 GeV for the study of neutrino-physics using the data from underground neutrino-detectors. The uncertainty of atmospheric neutrino-flux is also discussed. A brief comment is made to interpret the anomaly in terms of neutrino oscillations. |
1111.0603 | Leonard Gamberg | Leonard Gamberg, Daniel Boer, Bernhard Musch, Alexei Prokudin | Semi-Inclusive Deep Inelastic Scattering and Bessel-Weighted Asymmetries | 7 pages, 1 figure, to appear in PACSpin2011 (Cairns, 20-24 June,
2011) conference proceedings (AIP) | null | 10.1063/1.3667306 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We consider the cross section in Fourier space, conjugate to the outgoing
hadron's transverse momentum, where convolutions of transverse momentum
dependent parton distribution functions and fragmentation functions become
simple products. Individual asymmetric terms in the cross section can be
projected out by means of a generalized set of weights involving Bessel
functions. Advantages of employing these Bessel weights are that they suppress
(divergent) contributions from high transverse momentum and that soft factors
cancel in (Bessel-) weighted asymmetries. Also, the resulting compact
expressions immediately connect to previous work on evolution equations for
transverse momentum dependent parton distribution and fragmentation functions
and to quantities accessible in lattice QCD. Bessel-weighted asymmetries are
thus model independent observables that augment the description and our
understanding of correlations of spin and momentum in nucleon structure.
| [
{
"created": "Wed, 2 Nov 2011 18:49:18 GMT",
"version": "v1"
}
] | 2015-06-03 | [
[
"Gamberg",
"Leonard",
""
],
[
"Boer",
"Daniel",
""
],
[
"Musch",
"Bernhard",
""
],
[
"Prokudin",
"Alexei",
""
]
] | We consider the cross section in Fourier space, conjugate to the outgoing hadron's transverse momentum, where convolutions of transverse momentum dependent parton distribution functions and fragmentation functions become simple products. Individual asymmetric terms in the cross section can be projected out by means of a generalized set of weights involving Bessel functions. Advantages of employing these Bessel weights are that they suppress (divergent) contributions from high transverse momentum and that soft factors cancel in (Bessel-) weighted asymmetries. Also, the resulting compact expressions immediately connect to previous work on evolution equations for transverse momentum dependent parton distribution and fragmentation functions and to quantities accessible in lattice QCD. Bessel-weighted asymmetries are thus model independent observables that augment the description and our understanding of correlations of spin and momentum in nucleon structure. |
1703.04754 | Hubert Spiesberger | G. Kramer and H. Spiesberger | Study of heavy meson production in p-Pb collisions at $\sqrt{S}$=5.02
TeV in the general-mass variable-flavour-number scheme | 20 pages, extended discussion, agrees with published version in
Nucl.Phys.B | null | null | DESY 17-040, MITP/17-016 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study inclusive charm and bottom production, for both D and B mesons, in
p-Pb collisions at the LHC. Numerical results for p_T-differential production
cross sections are obtained at next-to-leading-order in the general-mass
variable-flavor-number scheme. We compare our results with recent data from
ALICE, LHCb and CMS at a center-of-mass energy of 5 TeV and find good
agreement. A comparison with p-p cross sections does not reveal the presence of
nuclear initial-state interaction effects that could be expected to become
visible as deviations of the ratio of p-Pb and p-p cross sections from one.
| [
{
"created": "Tue, 14 Mar 2017 22:13:14 GMT",
"version": "v1"
},
{
"created": "Tue, 31 Oct 2017 10:05:24 GMT",
"version": "v2"
}
] | 2017-11-01 | [
[
"Kramer",
"G.",
""
],
[
"Spiesberger",
"H.",
""
]
] | We study inclusive charm and bottom production, for both D and B mesons, in p-Pb collisions at the LHC. Numerical results for p_T-differential production cross sections are obtained at next-to-leading-order in the general-mass variable-flavor-number scheme. We compare our results with recent data from ALICE, LHCb and CMS at a center-of-mass energy of 5 TeV and find good agreement. A comparison with p-p cross sections does not reveal the presence of nuclear initial-state interaction effects that could be expected to become visible as deviations of the ratio of p-Pb and p-p cross sections from one. |
0910.3102 | Christine T. H. Davies | C. T. H. Davies, C. McNeile, K. Y. Wong, E. Follana, R. Horgan, K.
Hornbostel, G. P. Lepage, J. Shigemitsu, H. Trottier | Precise charm to strange mass ratio and light quark masses from full
lattice QCD | 4 pages, 2 figures. Version accepted by Physical Review Letters.
Changes include modifying the title, using the MILC value for m_s/m_l which
changes slightly the resulting up and down quark masses and their average,
adding some references and making other small adjustments to the text for
space reasons. | Phys.Rev.Lett.104:132003,2010 | 10.1103/PhysRevLett.104.132003 | null | hep-ph hep-lat | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | By using a single formalism to handle charm, strange and light valence quarks
in full lattice QCD for the first time, we are able to determine ratios of
quark masses to 1%. For $m_c/m_s$ we obtain 11.85(16), an order of magnitude
more precise than the current PDG average. Combined with 1% determinations of
the charm quark mass now possible this gives $\bar{m}_s(2{\rm GeV}) =$
92.4(1.5) MeV. The MILC result for $m_s/m_l = 27.2(3) $ yields $\bar{m}_l(2{\rm
GeV})$ = 3.40(7) MeV for the average of $u$ and $d$ quark masses.
| [
{
"created": "Fri, 16 Oct 2009 12:30:32 GMT",
"version": "v1"
},
{
"created": "Thu, 11 Mar 2010 10:36:43 GMT",
"version": "v2"
}
] | 2010-04-06 | [
[
"Davies",
"C. T. H.",
""
],
[
"McNeile",
"C.",
""
],
[
"Wong",
"K. Y.",
""
],
[
"Follana",
"E.",
""
],
[
"Horgan",
"R.",
""
],
[
"Hornbostel",
"K.",
""
],
[
"Lepage",
"G. P.",
""
],
[
"Shigemitsu",
... | By using a single formalism to handle charm, strange and light valence quarks in full lattice QCD for the first time, we are able to determine ratios of quark masses to 1%. For $m_c/m_s$ we obtain 11.85(16), an order of magnitude more precise than the current PDG average. Combined with 1% determinations of the charm quark mass now possible this gives $\bar{m}_s(2{\rm GeV}) =$ 92.4(1.5) MeV. The MILC result for $m_s/m_l = 27.2(3) $ yields $\bar{m}_l(2{\rm GeV})$ = 3.40(7) MeV for the average of $u$ and $d$ quark masses. |
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