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|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
hep-ph/9207260 | Niigata Kazuki | H. Hata and I. Niigata | Color Confinement, Abelian Gauge and Renormalization Group Flow | 20 pages + 3 figures (not included), phyzzx.tex | Nucl.Phys. B389 (1993) 133-152 | 10.1016/0550-3213(93)90288-Z | KUNS-1146 | hep-ph hep-th | null | Under the assumption that the color charge can be written in a BRST exact
form, the color confinement mechanism proposed by Kugo and Ojima (KO) explains
the confinement of any colored particles including dynamical quarks and gluons.
This mechanism, however, is known to break down in the Abelian gauge which
treats the maximal Abelian subgroup of the gauge group in a special manner. In
order to study whether the failure of the KO mechanism is particular only to
the Abelian gauge or whether this failure occurs in a wide class of gauges
including the ordinary Lorentz type gauge, we carry out a renormalization group
study of the $SU(2)$ gauge theory in the gauge fixing space. Our gauge fixing
space consists of four distinct regions that are not connected with each other
by renormalization group flows, and we find that the Abelian gauge is {\it
infrared unstable} in three regions which include the Lorentz type gauge. This
suggests that the failure of the KO mechanism is a phenomenon which occurs only
in the Abelian gauge. We also find that the Lorentz gauge is infrared stable.
| [
{
"created": "Mon, 27 Jul 1992 05:32:24 GMT",
"version": "v1"
}
] | 2009-10-22 | [
[
"Hata",
"H.",
""
],
[
"Niigata",
"I.",
""
]
] | Under the assumption that the color charge can be written in a BRST exact form, the color confinement mechanism proposed by Kugo and Ojima (KO) explains the confinement of any colored particles including dynamical quarks and gluons. This mechanism, however, is known to break down in the Abelian gauge which treats the maximal Abelian subgroup of the gauge group in a special manner. In order to study whether the failure of the KO mechanism is particular only to the Abelian gauge or whether this failure occurs in a wide class of gauges including the ordinary Lorentz type gauge, we carry out a renormalization group study of the $SU(2)$ gauge theory in the gauge fixing space. Our gauge fixing space consists of four distinct regions that are not connected with each other by renormalization group flows, and we find that the Abelian gauge is {\it infrared unstable} in three regions which include the Lorentz type gauge. This suggests that the failure of the KO mechanism is a phenomenon which occurs only in the Abelian gauge. We also find that the Lorentz gauge is infrared stable. |
hep-ph/9510292 | Bednyakov Vadim | V.A.Bednyakov (JINR,Dubna), H.V.Klapdor-Kleingrothaus
(MPIK,Heidelberg), S.G.Kovalenko (JINR,Dubna) | Expectations for Supersymmetric Dark Matter Searches Underground | 17 pages, 8 Postscript figures, uses worldsci.sty Talk at the
Workshop on Double Beta Decay and Related Topics, Trento, Italy, 1995 (to
appear in the Workshop Proceedings) | null | null | null | hep-ph | null | We consider the neutralino as a dominant Dark Matter particle in the galactic
halo and investigate some general issues of direct Dark Matter searches via
elastic neutralino-nucleus scattering. On the basis of conventional assumptions
about the nuclear and nucleon structure we analyse constraints on SUSY model
parameter space accessible by the direct Dark Matter searches. This analysis
shows that Dark Matter detectors fall into the THREE different categories with
respect to their sensitivity to different groups of the SUSY model parameters.
We calculate the event rate for various experimentally interesting isotopes
within the Minimal Supersymmetric Standard Model (MSSM) taking into account the
known accelerator and cosmological constraints on the MSSM parameter space. We
investigate the role of nuclear spin in elastic neutralino - nucleus
scattering. It is found that the contribution of the spin-dependent interaction
to this process is subdominant for nuclei with atomic weights A > 50.
| [
{
"created": "Sat, 14 Oct 1995 16:03:11 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Bednyakov",
"V. A.",
"",
"JINR,Dubna"
],
[
"Klapdor-Kleingrothaus",
"H. V.",
"",
"MPIK,Heidelberg"
],
[
"Kovalenko",
"S. G.",
"",
"JINR,Dubna"
]
] | We consider the neutralino as a dominant Dark Matter particle in the galactic halo and investigate some general issues of direct Dark Matter searches via elastic neutralino-nucleus scattering. On the basis of conventional assumptions about the nuclear and nucleon structure we analyse constraints on SUSY model parameter space accessible by the direct Dark Matter searches. This analysis shows that Dark Matter detectors fall into the THREE different categories with respect to their sensitivity to different groups of the SUSY model parameters. We calculate the event rate for various experimentally interesting isotopes within the Minimal Supersymmetric Standard Model (MSSM) taking into account the known accelerator and cosmological constraints on the MSSM parameter space. We investigate the role of nuclear spin in elastic neutralino - nucleus scattering. It is found that the contribution of the spin-dependent interaction to this process is subdominant for nuclei with atomic weights A > 50. |
1706.09484 | Sarira Sahu | Jose F. Nieves and Sarira Sahu | Neutrino propagation in an electron background with an inhomogeneous
magnetic field | Title changes, 39 pages, 2 figures | Eur.Phys.J. C78 (2018) no.7, 547 | 10.1140/epjc/s10052-018-6030-7 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the electromagnetic coupling of a neutrino that propagates in a
two-stream electron background medium. Specifically, we calculate the
electromagnetic vertex function for a medium that consists of a \emph{normal}
electron background plus another electron \emph{stream} background that is
moving with a velocity four-vector $v^\mu$ relative to the normal background.
The results can be used as the basis for studying the neutrino electromagnetic
properties and various processes in such a medium. As an application, we
calculate the neutrino dispersion relation in the presence of an external
magnetic field ($\vec B$), focused in the case in which $B$ is inhomogeneous,
keeping only the terms of the lowest order in $1/m^2_W$ and linear in the $B$
and its gradient. We show that the dispersion relation contains additional
anisotropic terms involving the derivatives of $\vec B$, such as the gradient
of $\hat k\cdot(\vec v\times\vec B)$, which involve the stream background
velocity, and a term of the form $\hat k\cdot(\nabla\times \vec B)$ that can be
present in the absence of the stream background, in addition to a term of the
form $\hat k\cdot\vec v$ and the well known term $\hat k\cdot\vec B$ that
arises in the constant $\vec B$ case. The derivative-dependent terms are even
under a $CP$ transformation. As a result, in contrast to the latter two just
mentioned, they depend on the sum of the particle and antiparticle densities
and therefore can be non-zero in a $CP$-symmetric medium in which the particle
and antiparticle densities are equal.
| [
{
"created": "Wed, 28 Jun 2017 20:52:30 GMT",
"version": "v1"
},
{
"created": "Sat, 28 Jul 2018 18:34:19 GMT",
"version": "v2"
}
] | 2018-07-31 | [
[
"Nieves",
"Jose F.",
""
],
[
"Sahu",
"Sarira",
""
]
] | We study the electromagnetic coupling of a neutrino that propagates in a two-stream electron background medium. Specifically, we calculate the electromagnetic vertex function for a medium that consists of a \emph{normal} electron background plus another electron \emph{stream} background that is moving with a velocity four-vector $v^\mu$ relative to the normal background. The results can be used as the basis for studying the neutrino electromagnetic properties and various processes in such a medium. As an application, we calculate the neutrino dispersion relation in the presence of an external magnetic field ($\vec B$), focused in the case in which $B$ is inhomogeneous, keeping only the terms of the lowest order in $1/m^2_W$ and linear in the $B$ and its gradient. We show that the dispersion relation contains additional anisotropic terms involving the derivatives of $\vec B$, such as the gradient of $\hat k\cdot(\vec v\times\vec B)$, which involve the stream background velocity, and a term of the form $\hat k\cdot(\nabla\times \vec B)$ that can be present in the absence of the stream background, in addition to a term of the form $\hat k\cdot\vec v$ and the well known term $\hat k\cdot\vec B$ that arises in the constant $\vec B$ case. The derivative-dependent terms are even under a $CP$ transformation. As a result, in contrast to the latter two just mentioned, they depend on the sum of the particle and antiparticle densities and therefore can be non-zero in a $CP$-symmetric medium in which the particle and antiparticle densities are equal. |
1604.07894 | Shu-Yu Ho | Shu-Yu Ho, Takashi Toma, Koji Tsumura | Systematic U(1)_{B-L} Extensions of Loop-Induced Neutrino Mass Models
with Dark Matter | 15 pages, 4 figures, revised to match version published in PRD | Phys. Rev. D 94, 033007 (2016) | 10.1103/PhysRevD.94.033007 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the gauged U(1)_{B-L} extensions of the models for neutrino masses
and dark matter. In this class of models, tiny neutrino masses are radiatively
induced through the loop diagrams, while the origin of the dark matter
stability is guaranteed by the remnant of the gauge symmetry. Depending on how
the lepton number is violated in the neutrino mass diagrams, these models are
systematically classified. We present a complete list for the one-loop Z_2 and
the two-loop Z_3 neutrino mass models as examples of the classification. These
underlying gauge symmetries and its breaking patterns can be probed at future
high energy colliders by looking at the width of the new gauge boson.
| [
{
"created": "Wed, 27 Apr 2016 00:16:45 GMT",
"version": "v1"
},
{
"created": "Wed, 19 Oct 2016 16:08:58 GMT",
"version": "v2"
}
] | 2016-10-20 | [
[
"Ho",
"Shu-Yu",
""
],
[
"Toma",
"Takashi",
""
],
[
"Tsumura",
"Koji",
""
]
] | We study the gauged U(1)_{B-L} extensions of the models for neutrino masses and dark matter. In this class of models, tiny neutrino masses are radiatively induced through the loop diagrams, while the origin of the dark matter stability is guaranteed by the remnant of the gauge symmetry. Depending on how the lepton number is violated in the neutrino mass diagrams, these models are systematically classified. We present a complete list for the one-loop Z_2 and the two-loop Z_3 neutrino mass models as examples of the classification. These underlying gauge symmetries and its breaking patterns can be probed at future high energy colliders by looking at the width of the new gauge boson. |
hep-ph/9912336 | Joannis Papavassiliou | Joannis Papavassiliou (FT Univ. Valencia) | The Pinch Technique at Two Loops | 4 pages, uses Revtex, two figures in a separate ps file | Phys.Rev.Lett.84:2782-2785,2000 | 10.1103/PhysRevLett.84.2782 | FTUV-99-12-14 | hep-ph | null | It is shown that the fundamental properties of gauge-independence,
gauge-invariance, unitarity, and analyticity of the $S$-matrix lead to the
unambiguous generalization of the pinch technique algorithm to two loops.
| [
{
"created": "Tue, 14 Dec 1999 14:31:34 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Papavassiliou",
"Joannis",
"",
"FT Univ. Valencia"
]
] | It is shown that the fundamental properties of gauge-independence, gauge-invariance, unitarity, and analyticity of the $S$-matrix lead to the unambiguous generalization of the pinch technique algorithm to two loops. |
2302.11600 | Keh-Fei Liu | Keh-Fei Liu | Hadrons, Superconductor Vortices, and Cosmological Constant | Version to be published in Phys. Lett. B | null | null | null | hep-ph gr-qc hep-lat hep-th nucl-ex | http://creativecommons.org/licenses/by/4.0/ | We explore the roles of the trace anomaly in several hadron properties. We
derive the scale invariant expression for the pressure from the gravitational
form factors (GFF) of QCD which results in consistent results for the mass and
rest energy from the GFF and those from the trace and the Hamiltonian of the
energy-momentum tensor (EMT) operators. It is shown that the energy-equilibrium
correspondence of hadrons infers an equation of state where the trace anomaly
matrix element, emerging from the glue condensate in the vacuum, gives a
negative constant pressure that leads to confinement, much like the confinement
mechanism for the vortices in type II superconductors where the negative
constant pressure is due to the cost of depleting the superconducting
condensate. We also note that both the trace anomaly in the QCD energy-momentum
tensor and the cosmological constant in Einstein's equation are associated with
the metric term which contributes to both energy and pressure. Their difference
in terms of the role the pressure plays is discussed. Finally, we note that a
lattice calculation of the trace anomaly distribution in the pion has addressed
a question about the trace anomaly contribution to the pion mass and suggests
that there might be a connection between the conformal symmetry breaking and
chiral symmetry breaking in this case.
| [
{
"created": "Wed, 22 Feb 2023 19:00:55 GMT",
"version": "v1"
},
{
"created": "Mon, 3 Apr 2023 18:43:39 GMT",
"version": "v2"
},
{
"created": "Wed, 20 Dec 2023 21:20:05 GMT",
"version": "v3"
}
] | 2023-12-22 | [
[
"Liu",
"Keh-Fei",
""
]
] | We explore the roles of the trace anomaly in several hadron properties. We derive the scale invariant expression for the pressure from the gravitational form factors (GFF) of QCD which results in consistent results for the mass and rest energy from the GFF and those from the trace and the Hamiltonian of the energy-momentum tensor (EMT) operators. It is shown that the energy-equilibrium correspondence of hadrons infers an equation of state where the trace anomaly matrix element, emerging from the glue condensate in the vacuum, gives a negative constant pressure that leads to confinement, much like the confinement mechanism for the vortices in type II superconductors where the negative constant pressure is due to the cost of depleting the superconducting condensate. We also note that both the trace anomaly in the QCD energy-momentum tensor and the cosmological constant in Einstein's equation are associated with the metric term which contributes to both energy and pressure. Their difference in terms of the role the pressure plays is discussed. Finally, we note that a lattice calculation of the trace anomaly distribution in the pion has addressed a question about the trace anomaly contribution to the pion mass and suggests that there might be a connection between the conformal symmetry breaking and chiral symmetry breaking in this case. |
2212.12160 | Kenichi Nakano | J. Dove, B. Kerns, C. Leung, R. E. McClellan, S. Miyasaka, D. H.
Morton, K. Nagai, S. Prasad, F. Sanftl, M. B. C. Scott, A. S. Tadepalli, C.
A. Aidala, J. Arrington, C. Ayuso, C. T. Barker, C. N. Brown, T. H. Chang, W.
C. Chang, A. Chen, D. C. Christian, B. P. Dannowitz, M. Daugherity, M.
Diefenthaler, L. El Fassi, D. F. Geesaman, R. Gilman, Y. Goto, L. Guo, R.
Guo, T. J. Hague, R. J. Holt, D. Isenhower, E. R. Kinney, N. D. Kitts, A.
Klein, D. W. Kleinjan, Y. Kudo, P.-J. Lin, K. Liu, M. X. Liu, W. Lorenzon, N.
C. R. Makins, M. Mesquita de Medeiros, P. L. McGaughey, Y. Miyachi, I.
Mooney, K. Nakahara, K. Nakano, S. Nara, J. C. Peng, A. J. Puckett, B. J.
Ramson, P. E. Reimer, J. G. Rubin, S. Sawada, T. Sawada, T.-A. Shibata, S. H.
Shiu, D. Su, M. Teo, B. G Tice, R. S. Towell, S. Uemura, T. S. Watson, S. G.
Wang, A. B. Wickes, J. Wu, Z. Xi, Z. Ye | Measurement of flavor asymmetry of light-quark sea in the proton with
Drell-Yan dimuon production in $p+p$ and $p+d$ collisions at 120 GeV | null | null | null | null | hep-ph hep-ex nucl-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Evidence for a flavor asymmetry between the $\bar u$ and $\bar d$ quark
distributions in the proton has been found in deep-inelastic scattering and
Drell-Yan experiments. The pronounced dependence of this flavor asymmetry on
$x$ (fraction of nucleon momentum carried by partons) observed in the Fermilab
E866 Drell-Yan experiment suggested a drop of the $\bar d\left(x\right) / \bar
u\left(x\right)$ ratio in the $x > 0.15$ region. We report results from the
SeaQuest Fermilab E906 experiment with improved statistical precision for $\bar
d\left(x\right) / \bar u\left(x\right)$ in the large $x$ region up to $x=0.45$
using the 120 GeV proton beam. Two different methods for extracting the
Drell-Yan cross section ratios, $\sigma^{pd} /2 \sigma^{pp}$, from the SeaQuest
data give consistent results. The $\bar{d}\left(x\right) /
\bar{u}\left(x\right)$ ratios and the $\bar d\left(x\right) - \bar
u\left(x\right)$ differences are deduced from these cross section ratios for
$0.13 < x < 0.45$. The SeaQuest and E866/NuSea $\bar{d}\left(x\right) /
\bar{u}\left(x\right)$ ratios are in good agreement for the $x\lesssim 0.25$
region. The new SeaQuest data, however, show that $\bar d\left(x\right)$
continues to be greater than $\bar u\left(x\right)$ up to the highest $x$ value
($x = 0.45$). The new results on $\bar{d}\left(x\right) /
\bar{u}\left(x\right)$ and $\bar{d}\left(x\right) - \bar{u}\left(x\right)$ are
compared with various parton distribution functions and theoretical
calculations.
| [
{
"created": "Fri, 23 Dec 2022 05:49:33 GMT",
"version": "v1"
},
{
"created": "Wed, 4 Jan 2023 20:54:55 GMT",
"version": "v2"
},
{
"created": "Tue, 20 Jun 2023 15:11:24 GMT",
"version": "v3"
},
{
"created": "Mon, 2 Oct 2023 19:51:21 GMT",
"version": "v4"
}
] | 2023-10-04 | [
[
"Dove",
"J.",
""
],
[
"Kerns",
"B.",
""
],
[
"Leung",
"C.",
""
],
[
"McClellan",
"R. E.",
""
],
[
"Miyasaka",
"S.",
""
],
[
"Morton",
"D. H.",
""
],
[
"Nagai",
"K.",
""
],
[
"Prasad",
"S.",
... | Evidence for a flavor asymmetry between the $\bar u$ and $\bar d$ quark distributions in the proton has been found in deep-inelastic scattering and Drell-Yan experiments. The pronounced dependence of this flavor asymmetry on $x$ (fraction of nucleon momentum carried by partons) observed in the Fermilab E866 Drell-Yan experiment suggested a drop of the $\bar d\left(x\right) / \bar u\left(x\right)$ ratio in the $x > 0.15$ region. We report results from the SeaQuest Fermilab E906 experiment with improved statistical precision for $\bar d\left(x\right) / \bar u\left(x\right)$ in the large $x$ region up to $x=0.45$ using the 120 GeV proton beam. Two different methods for extracting the Drell-Yan cross section ratios, $\sigma^{pd} /2 \sigma^{pp}$, from the SeaQuest data give consistent results. The $\bar{d}\left(x\right) / \bar{u}\left(x\right)$ ratios and the $\bar d\left(x\right) - \bar u\left(x\right)$ differences are deduced from these cross section ratios for $0.13 < x < 0.45$. The SeaQuest and E866/NuSea $\bar{d}\left(x\right) / \bar{u}\left(x\right)$ ratios are in good agreement for the $x\lesssim 0.25$ region. The new SeaQuest data, however, show that $\bar d\left(x\right)$ continues to be greater than $\bar u\left(x\right)$ up to the highest $x$ value ($x = 0.45$). The new results on $\bar{d}\left(x\right) / \bar{u}\left(x\right)$ and $\bar{d}\left(x\right) - \bar{u}\left(x\right)$ are compared with various parton distribution functions and theoretical calculations. |
1010.1970 | Lance Labun | Lance Labun and Jan Rafelski | Strong Field Physics: Probing Critical Acceleration and Inertia with
Laser Pulses and Quark-Gluon Plasma | 20 pages, 3 figures; based on lectures presented at 50th Cracow
School of Theoretical Physics, June 2010 | Acta Phys.Polon.B41:2763-2783,2010 | null | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Understanding physics in domains of critical (quantum unstable) fields
requires investigating the classical and quantum particle dynamics at the
critical acceleration, $\dot u \to 1$ [natural units]. This regime of physics
remains today experimentally practically untested. Particle and light collision
experiments reaching critical acceleration are becoming feasible, in particular
applying available high intensity laser technology. Ultra-relativistic heavy
ion collisions breach the critical domain but are complicated by the presence
of much other physics. The infamous problem of radiation reaction and the
challenging environment of quantum vacuum instability arising in the high field
domain signal the need for a thorough redress of the present theoretical
framework.
| [
{
"created": "Sun, 10 Oct 2010 22:25:14 GMT",
"version": "v1"
}
] | 2011-03-02 | [
[
"Labun",
"Lance",
""
],
[
"Rafelski",
"Jan",
""
]
] | Understanding physics in domains of critical (quantum unstable) fields requires investigating the classical and quantum particle dynamics at the critical acceleration, $\dot u \to 1$ [natural units]. This regime of physics remains today experimentally practically untested. Particle and light collision experiments reaching critical acceleration are becoming feasible, in particular applying available high intensity laser technology. Ultra-relativistic heavy ion collisions breach the critical domain but are complicated by the presence of much other physics. The infamous problem of radiation reaction and the challenging environment of quantum vacuum instability arising in the high field domain signal the need for a thorough redress of the present theoretical framework. |
1405.0300 | Durmus Demir | Durmus A. Demir | Effects of Curvature-Higgs Coupling on Electroweak Fine-Tuning | 11 pp. Added references | Phys.Lett. B733 (2014) 237 | 10.1016/j.physletb.2014.05.002 | IZTECH-P-2014-02 | hep-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | It is shown that, nonminimal coupling between the Standard Model (SM) Higgs
field and spacetime curvature, present already at the renormalizable level, can
be fine-tuned to stabilize the electroweak scale against power-law ultraviolet
divergences. The nonminimal coupling acts as an extrinsic stabilizer with no
effect on the loop structure of the SM, if gravity is classical. This novel
fine-tuning scheme, which could also be interpreted within Sakharov's induced
gravity approach, works neatly in extensions of the SM involving additional
Higgs fields or singlet scalars.
| [
{
"created": "Thu, 1 May 2014 20:24:39 GMT",
"version": "v1"
},
{
"created": "Sat, 10 May 2014 07:30:50 GMT",
"version": "v2"
}
] | 2014-05-21 | [
[
"Demir",
"Durmus A.",
""
]
] | It is shown that, nonminimal coupling between the Standard Model (SM) Higgs field and spacetime curvature, present already at the renormalizable level, can be fine-tuned to stabilize the electroweak scale against power-law ultraviolet divergences. The nonminimal coupling acts as an extrinsic stabilizer with no effect on the loop structure of the SM, if gravity is classical. This novel fine-tuning scheme, which could also be interpreted within Sakharov's induced gravity approach, works neatly in extensions of the SM involving additional Higgs fields or singlet scalars. |
hep-ph/0101324 | Dr. Dubravko Klabucar | Dalibor Kekez (Institute Rudjer Boskovic), Dubravko Klabucar (Zagreb
University), Michael D. Scadron (University of Arizona) | Dynamical SU(3) linear sigma model and the mixing of eta'-eta and
sigma-f_0 mesons | 14 pages, 1 figure, elsart; version to appear in J. Phys. G, appendix
added, some typos corrected | J.Phys.G27:1775-1784,2001 | 10.1088/0954-3899/27/8/307 | ZTF-01/01 | hep-ph | null | The SU(3) linear sigma model is dynamically generated in loop-order using the
nonstrange-strange basis. Only self-consistent logarithmic divergent graphs are
needed, with quadratic divergent graphs replaced by SU(3) mass-shell equal
splitting laws. The latter lead to an eta'-eta mixing angle of 41.84 deg which
is consistent with phenomenology. Finally this above SU(3) linear sigma model
in turn predicts strong decay rates which are all compatible with data.
| [
{
"created": "Mon, 29 Jan 2001 16:30:41 GMT",
"version": "v1"
},
{
"created": "Wed, 13 Jun 2001 15:27:05 GMT",
"version": "v2"
}
] | 2008-11-26 | [
[
"Kekez",
"Dalibor",
"",
"Institute Rudjer Boskovic"
],
[
"Klabucar",
"Dubravko",
"",
"Zagreb\n University"
],
[
"Scadron",
"Michael D.",
"",
"University of Arizona"
]
] | The SU(3) linear sigma model is dynamically generated in loop-order using the nonstrange-strange basis. Only self-consistent logarithmic divergent graphs are needed, with quadratic divergent graphs replaced by SU(3) mass-shell equal splitting laws. The latter lead to an eta'-eta mixing angle of 41.84 deg which is consistent with phenomenology. Finally this above SU(3) linear sigma model in turn predicts strong decay rates which are all compatible with data. |
hep-ph/0408248 | Ben Lillie | JoAnne L. Hewett, Ben Lillie, Manuel Masip and Thomas G. Rizzo | Signatures of long-lived gluinos in split supersymmetry | 18 pages, 7 figures | JHEP 0409:070,2004 | 10.1088/1126-6708/2004/09/070 | SLAC-PUB-10630, UG-FT-166-04 | hep-ph astro-ph hep-ex | null | We examine the experimental signatures for the production of gluinos at
colliders and in cosmic rays within the split supersymmetry scenario. Unlike in
the MSSM, the gluinos in this model are relatively long-lived due to the large
value of the squark masses which mediate their decay. Searches at colliders are
found to be sensitive to the nature of gluino fragmentation as well as the
gluino-hadron interactions with nuclei and energy deposition as it traverses
the detector. We find that the worst-case scenario, where a neutral
gluino-hadron passes through the detector with little energy deposition, is
well described by a monojet signature. For this case, using Run I data we
obtain a bound of $m_{\tilde g} > 170$ GeV; this will increase to 210(1100) GeV
at Run II(LHC) if no excess events are observed. In the opposite case, where a
charged gluino-hadron travels through the detector, a significantly greater
reach is obtained via stable charged particle search techniques. We also
examine the production of gluino pairs in the atmosphere by cosmic rays and
show they are potentially observable at IceCube; this would provide a
cross-check for observations at hadron colliders.
| [
{
"created": "Mon, 23 Aug 2004 18:40:59 GMT",
"version": "v1"
}
] | 2010-02-03 | [
[
"Hewett",
"JoAnne L.",
""
],
[
"Lillie",
"Ben",
""
],
[
"Masip",
"Manuel",
""
],
[
"Rizzo",
"Thomas G.",
""
]
] | We examine the experimental signatures for the production of gluinos at colliders and in cosmic rays within the split supersymmetry scenario. Unlike in the MSSM, the gluinos in this model are relatively long-lived due to the large value of the squark masses which mediate their decay. Searches at colliders are found to be sensitive to the nature of gluino fragmentation as well as the gluino-hadron interactions with nuclei and energy deposition as it traverses the detector. We find that the worst-case scenario, where a neutral gluino-hadron passes through the detector with little energy deposition, is well described by a monojet signature. For this case, using Run I data we obtain a bound of $m_{\tilde g} > 170$ GeV; this will increase to 210(1100) GeV at Run II(LHC) if no excess events are observed. In the opposite case, where a charged gluino-hadron travels through the detector, a significantly greater reach is obtained via stable charged particle search techniques. We also examine the production of gluino pairs in the atmosphere by cosmic rays and show they are potentially observable at IceCube; this would provide a cross-check for observations at hadron colliders. |
hep-ph/0106336 | Thomas G. Rizzo | Thomas G. Rizzo | Probes Of Universal Extra Dimensions at Colliders | 26 pages, 7 figs, LaTex | Phys.Rev. D64 (2001) 095010 | 10.1103/PhysRevD.64.095010 | SLAC-PUB-8863 | hep-ph | null | In the Universal Extra Dimensions model of Appelquist, Cheng and Dobrescu,
all of the Standard Model fields are placed in the bulk and thus have
Kaluza-Klein(KK) excitations. These KK states can only be pair produced at
colliders due to the tree-level conservation of KK number, with the lightest of
them being stable and possibly having a mass as low as $\simeq 350-400$ GeV.
After calculating the contribution to $g-2$ in this model we investigate the
production cross sections and signatures for these particles at both hadron and
lepton colliders. We demonstrate that these signatures critically depend upon
whether the lightest KK states remain stable or are allowed to decay by any of
a number of new physics mechanisms. These mechanisms which induce KK decays are
studied in detail.
| [
{
"created": "Thu, 28 Jun 2001 18:13:46 GMT",
"version": "v1"
}
] | 2009-11-07 | [
[
"Rizzo",
"Thomas G.",
""
]
] | In the Universal Extra Dimensions model of Appelquist, Cheng and Dobrescu, all of the Standard Model fields are placed in the bulk and thus have Kaluza-Klein(KK) excitations. These KK states can only be pair produced at colliders due to the tree-level conservation of KK number, with the lightest of them being stable and possibly having a mass as low as $\simeq 350-400$ GeV. After calculating the contribution to $g-2$ in this model we investigate the production cross sections and signatures for these particles at both hadron and lepton colliders. We demonstrate that these signatures critically depend upon whether the lightest KK states remain stable or are allowed to decay by any of a number of new physics mechanisms. These mechanisms which induce KK decays are studied in detail. |
2205.03427 | Florian Herren | Florian Herren | The forward-backward asymmetry and differences of partial moments in
inclusive semileptonic B decays | Fixed some numbers, conclusions unchanged | SciPost Phys. 14, 020 (2023) | 10.21468/SciPostPhys.14.2.020 | FERMILAB-PUB-22-378-T | hep-ph hep-ex | http://creativecommons.org/licenses/by/4.0/ | Global fits to moments of kinematic distributions measured in inclusive
semileptonic $B\rightarrow X_c l \nu_l$ enable the determination of the
Cabibbo-Kobayashi-Maskawa matrix element $|V_{cb}|$ together with
non-perturbative matrix elements of the heavy quark expansion. In current fits,
only two distinct kinematic distributions are employed and, as a consequence,
higher moments of these distributions need to be taken into account to extract
the relevant non-perturbative matrix elements. The moments of a given
distribution are highly correlated and experimental uncertainties increase for
higher moments. To address these issues, Turczyk suggested the inclusion of the
charged lepton forward-backward asymmetry $\mathcal{A}_{FB}$ in global fits,
since it provides information on non-perturbative parameters beyond the
commonly used moments.
It is possible to construct differences of partial moments of kinematic
distributions, which can provide additional information on the non-perturbative
parameters beyond $\mathcal{A}_{FB}$ and are studied in this work for the first
time. Further, experimental cuts on the four-momentum transfer square are
studied and are shown to preserve the shape of the angular distribution, in
contrast to commonly used cuts on the lepton energy. Finally, the impact of
final-state radiation and experimental lepton identification requirements on
measurements of $\mathcal{A}_{FB}$ and differences of partial moments are
discussed.
| [
{
"created": "Fri, 6 May 2022 18:00:36 GMT",
"version": "v1"
},
{
"created": "Mon, 16 May 2022 15:28:48 GMT",
"version": "v2"
},
{
"created": "Sat, 9 Jul 2022 22:38:02 GMT",
"version": "v3"
}
] | 2023-02-22 | [
[
"Herren",
"Florian",
""
]
] | Global fits to moments of kinematic distributions measured in inclusive semileptonic $B\rightarrow X_c l \nu_l$ enable the determination of the Cabibbo-Kobayashi-Maskawa matrix element $|V_{cb}|$ together with non-perturbative matrix elements of the heavy quark expansion. In current fits, only two distinct kinematic distributions are employed and, as a consequence, higher moments of these distributions need to be taken into account to extract the relevant non-perturbative matrix elements. The moments of a given distribution are highly correlated and experimental uncertainties increase for higher moments. To address these issues, Turczyk suggested the inclusion of the charged lepton forward-backward asymmetry $\mathcal{A}_{FB}$ in global fits, since it provides information on non-perturbative parameters beyond the commonly used moments. It is possible to construct differences of partial moments of kinematic distributions, which can provide additional information on the non-perturbative parameters beyond $\mathcal{A}_{FB}$ and are studied in this work for the first time. Further, experimental cuts on the four-momentum transfer square are studied and are shown to preserve the shape of the angular distribution, in contrast to commonly used cuts on the lepton energy. Finally, the impact of final-state radiation and experimental lepton identification requirements on measurements of $\mathcal{A}_{FB}$ and differences of partial moments are discussed. |
2104.03259 | Wen Yin | Wen Yin | Muon $g-2$ Anomaly in Anomaly Mediation | 12 pages, 3 figures; version to appear in JHEP | null | null | TU-1122 | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The long-standing muon $g-2$ anomaly has been confirmed recently at the
Fermilab. The combined discrepancy from Fermilab and Brookhaven results shows a
difference from the theory at a significance of 4.2 $\sigma$. In addition, the
LHC has updated the lower mass bound of a pure wino. In this letter, we study
to what extent the $g-2$ can be explained in anomaly mediation scenarios, where
the pure wino is the dominant dark matter component. To this end, we derive
some model-independent constraints on the particle spectra and $g-2$. We find
that the $g-2$ explanation at the 1$\sigma$ level is driven into a corner if
the higgsino threshold correction is suppressed. On the contrary, if the
threshold correction is sizable, the $g-2$ can be explained. In the whole
viable parameter region, the gluino mass is at most $2-4\,$TeV, the bino mass
is at most $2\,$TeV, and the wino dark matter mass is at most $1-2\,$TeV. If
the muon $g-2$ anomaly is explained in the anomaly mediation scenarios,
colliders and indirect search for the dark matter may find further pieces of
evidence in the near future. Possible UV models for the large threshold
corrections are discussed.
| [
{
"created": "Wed, 7 Apr 2021 17:07:33 GMT",
"version": "v1"
},
{
"created": "Thu, 3 Jun 2021 09:42:25 GMT",
"version": "v2"
}
] | 2021-06-04 | [
[
"Yin",
"Wen",
""
]
] | The long-standing muon $g-2$ anomaly has been confirmed recently at the Fermilab. The combined discrepancy from Fermilab and Brookhaven results shows a difference from the theory at a significance of 4.2 $\sigma$. In addition, the LHC has updated the lower mass bound of a pure wino. In this letter, we study to what extent the $g-2$ can be explained in anomaly mediation scenarios, where the pure wino is the dominant dark matter component. To this end, we derive some model-independent constraints on the particle spectra and $g-2$. We find that the $g-2$ explanation at the 1$\sigma$ level is driven into a corner if the higgsino threshold correction is suppressed. On the contrary, if the threshold correction is sizable, the $g-2$ can be explained. In the whole viable parameter region, the gluino mass is at most $2-4\,$TeV, the bino mass is at most $2\,$TeV, and the wino dark matter mass is at most $1-2\,$TeV. If the muon $g-2$ anomaly is explained in the anomaly mediation scenarios, colliders and indirect search for the dark matter may find further pieces of evidence in the near future. Possible UV models for the large threshold corrections are discussed. |
1105.3219 | Chung Kao | Joshua Sayre (University of Oklahoma), Duane A. Dicus (University of
Texas), Chung Kao (University of Oklahoma) and S. Nandi (Oklahoma State
University) | Searching for Colorons at the Large Hadron Collider | REVTEX, 20 pages, 16 figures | Phys.Rev.D84:015011,2011 | 10.1103/PhysRevD.84.015011 | OU-HEP-110122 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We investigate the prospects for the discovery of massive color-octet vector
bosons at the CERN Large Hadron Collider with $\sqrt{s} = 14$ TeV. A
phenomenological Lagrangian is adopted to evaluate the cross section of a pair
of colored vector bosons (colorons, $\tilde{\rho}$) decaying into four colored
scalar resonances (hyper-pions, $\tilde{\pi}$), which then decay into eight
gluons. We include the dominant physics background from the production of
$8g,7g1q, 6g2q$, and $5g3q$, and determine the masses of $\tilde{\pi}$ and
$\tilde{\rho}$ where discovery is possible. For example, we find that a
5$\sigma$ signal can be established for $M_{\tilde{\pi}} \alt 495$ GeV
($M_{\tilde{\rho}} \alt 1650$ GeV). More generally we give the reach of this
process for a selection of possible cuts and integrated luminosities.
| [
{
"created": "Mon, 16 May 2011 21:10:03 GMT",
"version": "v1"
}
] | 2011-08-09 | [
[
"Sayre",
"Joshua",
"",
"University of Oklahoma"
],
[
"Dicus",
"Duane A.",
"",
"University of\n Texas"
],
[
"Kao",
"Chung",
"",
"University of Oklahoma"
],
[
"Nandi",
"S.",
"",
"Oklahoma State\n University"
]
] | We investigate the prospects for the discovery of massive color-octet vector bosons at the CERN Large Hadron Collider with $\sqrt{s} = 14$ TeV. A phenomenological Lagrangian is adopted to evaluate the cross section of a pair of colored vector bosons (colorons, $\tilde{\rho}$) decaying into four colored scalar resonances (hyper-pions, $\tilde{\pi}$), which then decay into eight gluons. We include the dominant physics background from the production of $8g,7g1q, 6g2q$, and $5g3q$, and determine the masses of $\tilde{\pi}$ and $\tilde{\rho}$ where discovery is possible. For example, we find that a 5$\sigma$ signal can be established for $M_{\tilde{\pi}} \alt 495$ GeV ($M_{\tilde{\rho}} \alt 1650$ GeV). More generally we give the reach of this process for a selection of possible cuts and integrated luminosities. |
hep-ph/9610343 | Sergey Goloskokov | S.V.Goloskokov | Effects of Pomeron Coupling in Diffractive Reactions | 10 pages latex, 2 postscript figures. To appear in the Proceedings of
the 3rd Meeting on the Prospects of Nucleon-Nucleon Spin Physics at HERA"
JINR Dubna June 28-29 1996 | null | null | null | hep-ph | null | The diffractive 2-jet production reactions in the proton-proton and
lepton-proton processes are discussed. It is shown that they may be very
suitable for studying the properties of the pomeron couplings with quarks and
hadrons in future polarized experiments at HERA, especially for HERA-$\vec N$
project.
| [
{
"created": "Mon, 14 Oct 1996 08:48:17 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Goloskokov",
"S. V.",
""
]
] | The diffractive 2-jet production reactions in the proton-proton and lepton-proton processes are discussed. It is shown that they may be very suitable for studying the properties of the pomeron couplings with quarks and hadrons in future polarized experiments at HERA, especially for HERA-$\vec N$ project. |
2104.04461 | Junichiro Kawamura | Junichiro Kawamura and Stuart Raby | $\ge 4 \mu$ signal from a vector-like lepton decaying to a muon-philic
$Z^\prime$ boson at the LHC | 11+6 pages, 8 figures | Phys. Rev. D 104, 035007 (2021) | 10.1103/PhysRevD.104.035007 | CTPU-PTC-21-14 | hep-ph hep-ex | http://creativecommons.org/licenses/by-sa/4.0/ | We propose a novel possibility to detect a very distinctive signal with more
than four muons originating from pair-produced vector-like leptons decaying to
a muon-philic $Z^\prime$ boson. These new particles are good candidates to
explain the anomalies in the muon anomalous magnetic moment and the $b\to
s\ell\ell$ processes. The doublet (singlet) vector-like leptons lighter than
1.3 (1.0) TeV are excluded by the latest data at the LHC if $\mathrm{BR}(E\to
Z^\prime \mu) = 1$. We also show that the excess in the signal region with more
than five leptons can be explained by this scenario if the vector-like lepton
is a weak singlet, with mass about 400 GeV and $\mathrm{BR}(E\to Z^\prime \mu)
= 0.25$. The future prospects at the HL-LHC are discussed.
| [
{
"created": "Fri, 9 Apr 2021 16:20:34 GMT",
"version": "v1"
}
] | 2021-08-18 | [
[
"Kawamura",
"Junichiro",
""
],
[
"Raby",
"Stuart",
""
]
] | We propose a novel possibility to detect a very distinctive signal with more than four muons originating from pair-produced vector-like leptons decaying to a muon-philic $Z^\prime$ boson. These new particles are good candidates to explain the anomalies in the muon anomalous magnetic moment and the $b\to s\ell\ell$ processes. The doublet (singlet) vector-like leptons lighter than 1.3 (1.0) TeV are excluded by the latest data at the LHC if $\mathrm{BR}(E\to Z^\prime \mu) = 1$. We also show that the excess in the signal region with more than five leptons can be explained by this scenario if the vector-like lepton is a weak singlet, with mass about 400 GeV and $\mathrm{BR}(E\to Z^\prime \mu) = 0.25$. The future prospects at the HL-LHC are discussed. |
1806.07264 | Gaetana Anamiati | G. Anamiati, Oscar Castillo-Felisola, Renato M. Fonseca, J. C. Helo,
M. Hirsch | High-dimensional neutrino masses | Coincides with published version in JHEP | null | 10.1007/JHEP12(2018)066 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | For Majorana neutrino masses the lowest dimensional operator possible is the
Weinberg operator at $d=5$. Here we discuss the possibility that neutrino
masses originate from higher dimensional operators. Specifically, we consider
all tree-level decompositions of the $d=9$, $d=11$ and $d=13$ neutrino mass
operators. With renormalizable interactions only, we find 18 topologies and 66
diagrams for $d=9$, and 92 topologies plus 504 diagrams at the $d=11$ level. At
$d=13$ there are already 576 topologies and 4199 diagrams. However, among all
these there are only very few genuine neutrino mass models: At $d=(9,11,13)$ we
find only (2,2,2) genuine diagrams and a total of (2,2,6) models. Here, a model
is considered genuine at level $d$ if it automatically forbids lower order
neutrino masses {\em without} the use of additional symmetries. We also briefly
discuss how neutrino masses and angles can be easily fitted in these
high-dimensional models.
| [
{
"created": "Tue, 19 Jun 2018 14:08:04 GMT",
"version": "v1"
},
{
"created": "Fri, 22 Jun 2018 08:56:34 GMT",
"version": "v2"
},
{
"created": "Fri, 25 Jan 2019 12:04:34 GMT",
"version": "v3"
}
] | 2019-01-28 | [
[
"Anamiati",
"G.",
""
],
[
"Castillo-Felisola",
"Oscar",
""
],
[
"Fonseca",
"Renato M.",
""
],
[
"Helo",
"J. C.",
""
],
[
"Hirsch",
"M.",
""
]
] | For Majorana neutrino masses the lowest dimensional operator possible is the Weinberg operator at $d=5$. Here we discuss the possibility that neutrino masses originate from higher dimensional operators. Specifically, we consider all tree-level decompositions of the $d=9$, $d=11$ and $d=13$ neutrino mass operators. With renormalizable interactions only, we find 18 topologies and 66 diagrams for $d=9$, and 92 topologies plus 504 diagrams at the $d=11$ level. At $d=13$ there are already 576 topologies and 4199 diagrams. However, among all these there are only very few genuine neutrino mass models: At $d=(9,11,13)$ we find only (2,2,2) genuine diagrams and a total of (2,2,6) models. Here, a model is considered genuine at level $d$ if it automatically forbids lower order neutrino masses {\em without} the use of additional symmetries. We also briefly discuss how neutrino masses and angles can be easily fitted in these high-dimensional models. |
1211.6209 | Vladimir Kovalenko | V. N. Kovalenko | Modelling of exclusive parton distributions and long-range rapidity
correlations for pp collisions at the LHC energy | 17 pages, 3 figures, in Russian; this is a preprint of the Materials
accepted for publication in Phys. Atom. Nucl. journal (2013):
http://www.maik.ru | Phys. Atom. Nucl. 76, 1189 (2013) [Yad. Fiz. 76, 1251 (2013)] | 10.1134/S1063778813100098 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Soft pp interactions are considered in the framework of the phenomenological
model with color strings formation. Under the assumption, that the elementary
collision is realized as interaction of two color dipoles, the total inelastic
cross section and the multiplicity of the charged particles are estimated and
used for the parameters fixing. The special attention is given to the modelling
of exclusive parton distributions taking into account the energy conservation
and fixing the mass center that is necessary for the description of
correlations, corresponding Monte Carlo procedures are developed for an
arbitrary number of partons in a hadron. The string fusion algorithm in a
cross-section plane is developed taking into account the finite rapidity width
of strings. In this framework the influence of string fusion effects on
long-range correlations of charged particles are estimated. The proposed
algorithms are planned to be used for studying of heavy ion collisions.
| [
{
"created": "Tue, 27 Nov 2012 04:23:01 GMT",
"version": "v1"
},
{
"created": "Thu, 8 Aug 2013 10:59:12 GMT",
"version": "v2"
}
] | 2013-10-23 | [
[
"Kovalenko",
"V. N.",
""
]
] | Soft pp interactions are considered in the framework of the phenomenological model with color strings formation. Under the assumption, that the elementary collision is realized as interaction of two color dipoles, the total inelastic cross section and the multiplicity of the charged particles are estimated and used for the parameters fixing. The special attention is given to the modelling of exclusive parton distributions taking into account the energy conservation and fixing the mass center that is necessary for the description of correlations, corresponding Monte Carlo procedures are developed for an arbitrary number of partons in a hadron. The string fusion algorithm in a cross-section plane is developed taking into account the finite rapidity width of strings. In this framework the influence of string fusion effects on long-range correlations of charged particles are estimated. The proposed algorithms are planned to be used for studying of heavy ion collisions. |
2103.05355 | Krzysztof Piasecki | T. Matulewicz, K. Piasecki | Particle yields in pp interactions at $\sqrt{s}=17.3$ GeV interpreted in
the statistical hadronization model | 14 pages | null | 10.1088/1361-6471/abfdd7 | null | hep-ph nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The unified set of yields of particles produced in proton-proton collisions
at $\sqrt{s}$ = 17.3 GeV (laboratory beam momentum 158 GeV/c) is evaluated,
combining the experimental results of the NA49 and NA61/SHINE collaborations at
the CERN SPS. With the statistical hadronization code Thermal-Fist we confirm
the unacceptably high value of $\chi^2$, both in the canonical and grand
canonical - strangeness canonical approach, and the common volume for all the
hadrons. The use of the energy-dependent width of the Breit-Wigner
parametrization for the mass distributions of unstable particles improves the
quality of the description of particle yields only slightly. We confirm the
observation that exclusion of the $\phi$ meson yield makes the fit result
acceptable. The complete experimental data set of particle yields can be
reasonably fitted if the canonical volumes of hadrons without and with open
strangeness are allowed to vary independently. The canonical volume of
strangeness was found larger than that for non-strange hadrons, which is
compatible with the femtoscopy measurements of p+p system at $\sqrt{s} = $ 27.4
MeV and 900 MeV. The model with the best-fit parameters allows to predict the
yields of several not yet measured particles emitted from p+p at $\sqrt{s}$ =
17.3 GeV.
| [
{
"created": "Tue, 9 Mar 2021 11:06:18 GMT",
"version": "v1"
}
] | 2021-08-11 | [
[
"Matulewicz",
"T.",
""
],
[
"Piasecki",
"K.",
""
]
] | The unified set of yields of particles produced in proton-proton collisions at $\sqrt{s}$ = 17.3 GeV (laboratory beam momentum 158 GeV/c) is evaluated, combining the experimental results of the NA49 and NA61/SHINE collaborations at the CERN SPS. With the statistical hadronization code Thermal-Fist we confirm the unacceptably high value of $\chi^2$, both in the canonical and grand canonical - strangeness canonical approach, and the common volume for all the hadrons. The use of the energy-dependent width of the Breit-Wigner parametrization for the mass distributions of unstable particles improves the quality of the description of particle yields only slightly. We confirm the observation that exclusion of the $\phi$ meson yield makes the fit result acceptable. The complete experimental data set of particle yields can be reasonably fitted if the canonical volumes of hadrons without and with open strangeness are allowed to vary independently. The canonical volume of strangeness was found larger than that for non-strange hadrons, which is compatible with the femtoscopy measurements of p+p system at $\sqrt{s} = $ 27.4 MeV and 900 MeV. The model with the best-fit parameters allows to predict the yields of several not yet measured particles emitted from p+p at $\sqrt{s}$ = 17.3 GeV. |
1409.0531 | Marius Wiesemann | Robert V. Harlander, Hendrik Mantler, Marius Wiesemann | Transverse momentum resummation for Higgs production via gluon fusion in
the MSSM | 33 pages, 13 figures | null | 10.1007/JHEP11(2014)116 | CERN-PH-TH-2014-170, WUB/14-07, ZU-TH 31/14, MCnet-14-19, LPN14-108 | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The resummed transverse momentum distribution of supersymmetric Higgs bosons
produced through gluon fusion at NLO+NLL is presented, including the exact
quark and squark mass dependences. Considering various MSSM scenarios, we
compare our results to previous ones within the POWHEG approach. We analyze the
impact of the bottom loop which becomes the dominant contribution to the gluon
fusion cross section for a wide range of the parameter space for the
pseudo-scalar and heavy Higgs.
| [
{
"created": "Mon, 1 Sep 2014 20:00:04 GMT",
"version": "v1"
},
{
"created": "Mon, 27 Oct 2014 09:10:58 GMT",
"version": "v2"
}
] | 2015-06-22 | [
[
"Harlander",
"Robert V.",
""
],
[
"Mantler",
"Hendrik",
""
],
[
"Wiesemann",
"Marius",
""
]
] | The resummed transverse momentum distribution of supersymmetric Higgs bosons produced through gluon fusion at NLO+NLL is presented, including the exact quark and squark mass dependences. Considering various MSSM scenarios, we compare our results to previous ones within the POWHEG approach. We analyze the impact of the bottom loop which becomes the dominant contribution to the gluon fusion cross section for a wide range of the parameter space for the pseudo-scalar and heavy Higgs. |
hep-ph/0504234 | Jose Illana | J.I. Illana, M. Masip, D. Meloni | TeV gravity at neutrino telescopes | 10 pages, 7 figures; new section on air showers added, version to be
published | Phys.Rev. D72 (2005) 024003 | 10.1103/PhysRevD.72.024003 | UG-FT-184/05, CAFPE-54/05, ROMA-1403-05 | hep-ph astro-ph | null | Cosmogenic neutrinos reach the Earth with energies around 10^9 GeV, and their
interactions with matter will be measured in upcoming experiments (Auger,
IceCube). Models with extra dimensions and the fundamental scale at the TeV
could imply signals in these experiments. In particular, the production of
microscopic black holes by cosmogenic neutrinos has been extensively studied in
the literature. Here we make a complete analysis of gravity-mediated
interactions at larger distances, where they can be calculated in the eikonal
approximation. In these processes a neutrino of energy E_\nu interacts
elastically with a parton inside a nucleon, loses a small fraction y of its
energy, and starts a hadronic shower of energy y E_\nu << E_\nu. We analyze the
ultraviolet dependence and the relevance of graviton emission in these
processes, and show that they are negligible. We also study the energy
distribution of cosmogenic events in AMANDA and IceCube and the possibility of
multiple-bang events. For any neutrino flux, the observation of an enhanced
rate of neutral current events above 100 TeV in neutrino telescopes could be
explained by TeV-gravity interactions. The values of the fundamental scale of
gravity that IceCube could reach are comparable to those to be explored at the
LHC.
| [
{
"created": "Tue, 26 Apr 2005 09:39:17 GMT",
"version": "v1"
},
{
"created": "Tue, 21 Jun 2005 18:08:27 GMT",
"version": "v2"
}
] | 2009-11-11 | [
[
"Illana",
"J. I.",
""
],
[
"Masip",
"M.",
""
],
[
"Meloni",
"D.",
""
]
] | Cosmogenic neutrinos reach the Earth with energies around 10^9 GeV, and their interactions with matter will be measured in upcoming experiments (Auger, IceCube). Models with extra dimensions and the fundamental scale at the TeV could imply signals in these experiments. In particular, the production of microscopic black holes by cosmogenic neutrinos has been extensively studied in the literature. Here we make a complete analysis of gravity-mediated interactions at larger distances, where they can be calculated in the eikonal approximation. In these processes a neutrino of energy E_\nu interacts elastically with a parton inside a nucleon, loses a small fraction y of its energy, and starts a hadronic shower of energy y E_\nu << E_\nu. We analyze the ultraviolet dependence and the relevance of graviton emission in these processes, and show that they are negligible. We also study the energy distribution of cosmogenic events in AMANDA and IceCube and the possibility of multiple-bang events. For any neutrino flux, the observation of an enhanced rate of neutral current events above 100 TeV in neutrino telescopes could be explained by TeV-gravity interactions. The values of the fundamental scale of gravity that IceCube could reach are comparable to those to be explored at the LHC. |
hep-ph/9504268 | Sergey M. Troshin | S. M. Troshin and N. E. Tyurin | Strangeness in constituent quarks and one-spin asymmetry in inclusive
$\varphi$-meson production | 8 pages, plain LaTeX, no figures | Phys.Lett. B355 (1995) 543-547 | 10.1016/0370-2693(95)00784-I | null | hep-ph | null | On the basis of the mechanism proposed earlier for one-spin asymmetries in
inclusive hadron production we consider OZI--suppressed process of
$\varphi$-meson production $pp\rightarrow \varphi X$ and asymmetry
$A_N(\varphi)$ in this process. The main role in generation of this asymmetry
belongs to the orbital angular momentum of strange quark-antiquark cloud in
internal structure of constituent quarks.
| [
{
"created": "Mon, 10 Apr 1995 19:25:55 GMT",
"version": "v1"
}
] | 2009-10-28 | [
[
"Troshin",
"S. M.",
""
],
[
"Tyurin",
"N. E.",
""
]
] | On the basis of the mechanism proposed earlier for one-spin asymmetries in inclusive hadron production we consider OZI--suppressed process of $\varphi$-meson production $pp\rightarrow \varphi X$ and asymmetry $A_N(\varphi)$ in this process. The main role in generation of this asymmetry belongs to the orbital angular momentum of strange quark-antiquark cloud in internal structure of constituent quarks. |
hep-ph/0508186 | C. A. de S. Pires | Alex G. Dias, C. A. de S. Pires, P. S. Rodrigues da Silva | Naturally light right-handed neutrinos in a 3-3-1 Model | About 5 pages, no-figures | Phys.Lett. B628 (2005) 85-92 | 10.1016/j.physletb.2005.09.028 | null | hep-ph | null | In this work we show that light right-handed neutrinos, with mass in the
sub-eV scale, is a natural outcome in a 3-3-1 model. By considering effective
dimension five operators, the model predicts three light right-handed
neutrinos, weakly mixed with the left-handed ones. We show also that the model
is able to explain the LSND experiment and still be in agreement with solar and
atmospheric data for neutrino oscillation.
| [
{
"created": "Wed, 17 Aug 2005 11:09:02 GMT",
"version": "v1"
}
] | 2009-11-11 | [
[
"Dias",
"Alex G.",
""
],
[
"Pires",
"C. A. de S.",
""
],
[
"da Silva",
"P. S. Rodrigues",
""
]
] | In this work we show that light right-handed neutrinos, with mass in the sub-eV scale, is a natural outcome in a 3-3-1 model. By considering effective dimension five operators, the model predicts three light right-handed neutrinos, weakly mixed with the left-handed ones. We show also that the model is able to explain the LSND experiment and still be in agreement with solar and atmospheric data for neutrino oscillation. |
1511.03651 | Edilson Alfonso Reyes Rojas | E.A. Reyes Rojas | The Higgs Boson at LHC and the Vacuum Stability of the Standard Model | A thesis submitted to the Universidad Nacional de Colombia for the
degree of Magister en Ciencias F\'isicas at the Faculty of Science.
Supervisor: Prof. Angelo Raffaele Fazio. arXiv admin note: text overlap with
arXiv:1403.6535, arXiv:1006.2231, arXiv:1307.3536, arXiv:hep-ph/0503172,
arXiv:hep-ph/9801383, arXiv:hep-ph/0111209, arXiv:1412.4215,
arXiv:hep-ph/9703319, arXiv:1412.3649, arXiv:hep-th/9606018,
arXiv:hep-ph/0703280, arXiv:hep-ph/0111190, arXiv:1407.4112 by other authors | null | null | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The main aim of this work is to study the conditions of absolute vacuum
stability within the Standard Model (SM) by the knowledge of the behaviour of
the Higgs quartic coupling up to high energy scales and using the new data on
the Higgs mass given by ATLAS and CMS as an input parameter. The Higgs mass
value observed by ATLAS and CMS leads to a negative value of the quartic
coupling, making metastable the vacuum of the Standard Model, as it is seen by
the renormalization group improved (RGI) effective potential. The stability
status of SM crucially depends upon the precise values of the top and Higgs
masses, a more precision determination of those masses and related
uncertainties can modify drastically our conclusions about the SM stability
properties. For this reason, we have computed the vacuum bubbles and the Higgs
tadpole diagrams, at two-loop level of accuracy, in a renormalization scheme
proposed by A. Sirlin and R. Zucchini, where the input parameters are obtained
in terms of physical observables related with muon decay, and where the
threshold effects are included. In particular, we focus on the analytic
computation of the Higgs tadpoles contributions by two different methods. From
one side we have computed the sum of the tadpoles as the first derivative of
the two-loop Higgs 1PI effective potential in the Sirlin-Zucchini scheme, on
the other side we have checked the obtained result toward the direct
diagrammatic two- loop computation, by proposing a way of automatization of our
procedure based on the generation of Feynman diagrams, reduction of their
integrands and evaluation of scalar integrals and sum of all contributions in a
non-redundant way. We used the code TARCER that implements the Tarasov method
to reduce two-loop tensorial integrals.
| [
{
"created": "Wed, 11 Nov 2015 20:55:27 GMT",
"version": "v1"
}
] | 2015-11-14 | [
[
"Rojas",
"E. A. Reyes",
""
]
] | The main aim of this work is to study the conditions of absolute vacuum stability within the Standard Model (SM) by the knowledge of the behaviour of the Higgs quartic coupling up to high energy scales and using the new data on the Higgs mass given by ATLAS and CMS as an input parameter. The Higgs mass value observed by ATLAS and CMS leads to a negative value of the quartic coupling, making metastable the vacuum of the Standard Model, as it is seen by the renormalization group improved (RGI) effective potential. The stability status of SM crucially depends upon the precise values of the top and Higgs masses, a more precision determination of those masses and related uncertainties can modify drastically our conclusions about the SM stability properties. For this reason, we have computed the vacuum bubbles and the Higgs tadpole diagrams, at two-loop level of accuracy, in a renormalization scheme proposed by A. Sirlin and R. Zucchini, where the input parameters are obtained in terms of physical observables related with muon decay, and where the threshold effects are included. In particular, we focus on the analytic computation of the Higgs tadpoles contributions by two different methods. From one side we have computed the sum of the tadpoles as the first derivative of the two-loop Higgs 1PI effective potential in the Sirlin-Zucchini scheme, on the other side we have checked the obtained result toward the direct diagrammatic two- loop computation, by proposing a way of automatization of our procedure based on the generation of Feynman diagrams, reduction of their integrands and evaluation of scalar integrals and sum of all contributions in a non-redundant way. We used the code TARCER that implements the Tarasov method to reduce two-loop tensorial integrals. |
0707.0030 | John F. Gunion | Hsin-Chia Cheng, John F. Gunion, Zhenyu Han, Guido Marandella, and Bob
McElrath | Mass Determination in SUSY-like Events with Missing Energy | 41 pages, 14 figures, various clarifications and expanded discussion
included in revised version that conforms to the version to be published | JHEP 0712:076,2007 | 10.1088/1126-6708/2007/12/076 | null | hep-ph astro-ph hep-ex | null | We describe a kinematic method which is capable of determining the overall
mass scale in SUSY-like events at a hadron collider with two missing (dark
matter) particles. We focus on the kinematic topology in which a pair of
identical particles is produced with each decaying to two leptons and an
invisible particle (schematically, $pp\to YY+jets$ followed by each $Y$
decaying via $Y\to \ell X\to \ell\ell'N$ where $N$ is invisible). This topology
arises in many SUSY processes such as squark and gluino production and decay,
not to mention $t\anti t$ di-lepton decays. In the example where the final
state leptons are all muons, our errors on the masses of the particles $Y$, $X$
and $N$ in the decay chain range from 4 GeV for 2000 events after cuts to 13
GeV for 400 events after cuts. Errors for mass differences are much smaller.
Our ability to determine masses comes from considering all the kinematic
information in the event, including the missing momentum, in conjunction with
the quadratic constraints that arise from the $Y$, $X$ and $N$ mass-shell
conditions. Realistic missing momentum and lepton momenta uncertainties are
included in the analysis.
| [
{
"created": "Sat, 30 Jun 2007 06:10:58 GMT",
"version": "v1"
},
{
"created": "Thu, 6 Dec 2007 20:27:59 GMT",
"version": "v2"
}
] | 2011-01-13 | [
[
"Cheng",
"Hsin-Chia",
""
],
[
"Gunion",
"John F.",
""
],
[
"Han",
"Zhenyu",
""
],
[
"Marandella",
"Guido",
""
],
[
"McElrath",
"Bob",
""
]
] | We describe a kinematic method which is capable of determining the overall mass scale in SUSY-like events at a hadron collider with two missing (dark matter) particles. We focus on the kinematic topology in which a pair of identical particles is produced with each decaying to two leptons and an invisible particle (schematically, $pp\to YY+jets$ followed by each $Y$ decaying via $Y\to \ell X\to \ell\ell'N$ where $N$ is invisible). This topology arises in many SUSY processes such as squark and gluino production and decay, not to mention $t\anti t$ di-lepton decays. In the example where the final state leptons are all muons, our errors on the masses of the particles $Y$, $X$ and $N$ in the decay chain range from 4 GeV for 2000 events after cuts to 13 GeV for 400 events after cuts. Errors for mass differences are much smaller. Our ability to determine masses comes from considering all the kinematic information in the event, including the missing momentum, in conjunction with the quadratic constraints that arise from the $Y$, $X$ and $N$ mass-shell conditions. Realistic missing momentum and lepton momenta uncertainties are included in the analysis. |
hep-ph/0211002 | Victor | Victor Pervushin | Astrophysical Data and Conformal Unified Theory | 14 pages, 2 figures, invited talk at the International Conference
"Hadron Structure '02'', 22 -- 27 September, 2002, Herlany, Slovakia | null | null | null | hep-ph astro-ph gr-qc hep-th | null | Astrophysical data reformulated in the units of the relative Paris meter and
running Planck mass are used for restoration of a conformal version of the
unified theory where the absolute Planck mass belongs to ordinary initial data
(like the absolute Ptolemaeus position of the earth belongs to the initial data
of Newton's mechanics). In the conformal unified theory, both the latest data
on the Supernova luminosity-distance -- redshift relation and primordial
nucleosynthesis are described by a free primordial motion of the scalar
homogeneous field (Scalar Quintessence). This primordial cosmic evolution leads
to intensive cosmological creation of vector bosons forming the baryon
asymmetry of the universe (during their lifetime) and the CMB radiation as a
final product of their decays. There are values of the initial data that give
the CMB temperature (as an integral of the primordial motion) and the energy
density budget in agreement with observational data.
| [
{
"created": "Thu, 31 Oct 2002 21:50:18 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Pervushin",
"Victor",
""
]
] | Astrophysical data reformulated in the units of the relative Paris meter and running Planck mass are used for restoration of a conformal version of the unified theory where the absolute Planck mass belongs to ordinary initial data (like the absolute Ptolemaeus position of the earth belongs to the initial data of Newton's mechanics). In the conformal unified theory, both the latest data on the Supernova luminosity-distance -- redshift relation and primordial nucleosynthesis are described by a free primordial motion of the scalar homogeneous field (Scalar Quintessence). This primordial cosmic evolution leads to intensive cosmological creation of vector bosons forming the baryon asymmetry of the universe (during their lifetime) and the CMB radiation as a final product of their decays. There are values of the initial data that give the CMB temperature (as an integral of the primordial motion) and the energy density budget in agreement with observational data. |
0804.1315 | Christophe Bernicot | C.Bernicot | The six-photon amplitude | 4 pages, 5 figures, talk given at 43nd Rencontres de Moriond on QCD
and High-Energy Interactions, La Thuile, March 2007 | null | null | LAPTH-Conf-1243/08 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Thanks to the absence of tree order, the six-photon processes is a good
laboratory to study multi-leg one-loop diagrams. Particularly, there are enough
on-shell external legs to observe a special Landau singularity: the double
parton scattering.
| [
{
"created": "Tue, 8 Apr 2008 16:12:24 GMT",
"version": "v1"
}
] | 2008-04-09 | [
[
"Bernicot",
"C.",
""
]
] | Thanks to the absence of tree order, the six-photon processes is a good laboratory to study multi-leg one-loop diagrams. Particularly, there are enough on-shell external legs to observe a special Landau singularity: the double parton scattering. |
0909.5104 | Rasmus Mackeprang | Rasmus Mackeprang | Signatures of long-lived colored sparticles | To appear in the proceedings of the 17th International Conference on
Supersymmetry and the Unification of Fundamental Interactions (SUSY09) | AIP Conf.Proc.1200:746-749,2010 | 10.1063/1.3327720 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper an updated Geant4 simulation toolkit is presented describing
the interactions in matter of heavy hadrons containing long-lived squarks and
gluinos. Generic signatures are derived that are applicable at the Large Hadron
Collider, and the problem of theoretical uncertainties arising from model
dependence is addressed. For a more detailed description of the assumptions and
techniques used, the reader is referred to arXiv:0908.1868.
| [
{
"created": "Mon, 28 Sep 2009 14:41:56 GMT",
"version": "v1"
}
] | 2015-05-14 | [
[
"Mackeprang",
"Rasmus",
""
]
] | In this paper an updated Geant4 simulation toolkit is presented describing the interactions in matter of heavy hadrons containing long-lived squarks and gluinos. Generic signatures are derived that are applicable at the Large Hadron Collider, and the problem of theoretical uncertainties arising from model dependence is addressed. For a more detailed description of the assumptions and techniques used, the reader is referred to arXiv:0908.1868. |
hep-ph/0005262 | Kiwoon Choi | Kiwoon Choi, Eung Jin Chun and Kyuwan Hwang | Lepton Flavor Violation and Bilinear R-parity Violation | 18 pages, Revtex | Phys.Lett. B488 (2000) 145-152 | 10.1016/S0370-2693(00)00857-1 | SCIPP-00/16, KAIST-TH 00/08, LANCS-TH/0006 | hep-ph | null | We examine some flavor changing processes such as rare leptonic decays of the
long-lived neutral kaon, muon-electron conversion in nuclei and radiative muon
decay which are induced by the combined effects of bilinear and trilinear
R-parity violations. These processes are used to put strong constraints on
certain products of the bilinear and trilinear couplings. We also discuss the
constraints on R-parity violation from neutrino masses and compare them with
the constraints from flavor changing decay processes. Large range of parameter
space satisfying the constraints from neutrino masses can be excluded by the
flavor changing processes considered in this paper, and also vice versa.
| [
{
"created": "Thu, 25 May 2000 19:02:14 GMT",
"version": "v1"
}
] | 2009-10-31 | [
[
"Choi",
"Kiwoon",
""
],
[
"Chun",
"Eung Jin",
""
],
[
"Hwang",
"Kyuwan",
""
]
] | We examine some flavor changing processes such as rare leptonic decays of the long-lived neutral kaon, muon-electron conversion in nuclei and radiative muon decay which are induced by the combined effects of bilinear and trilinear R-parity violations. These processes are used to put strong constraints on certain products of the bilinear and trilinear couplings. We also discuss the constraints on R-parity violation from neutrino masses and compare them with the constraints from flavor changing decay processes. Large range of parameter space satisfying the constraints from neutrino masses can be excluded by the flavor changing processes considered in this paper, and also vice versa. |
2203.08107 | Patrick Stengel | Tathagata Ghosh, Chris Kelso, Jason Kumar, Pearl Sandick, Patrick
Stengel | Simplified dark matter models with charged mediators | contribution to Snowmass 2021; 29 pages, 12 figures | null | null | HRI-RECAPP-2022-005 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We review simplified models in which a singlet Majorana dark matter candidate
couples to Standard Model (SM) fermions through interactions mediated by scalar
fermion partners. We summarize the two primary production mechanisms in these
scenarios: dark matter annihilation mediated by first or second generation
scalar fermion partners with significant left-right chiral mixing and
co-annihilation with scalar fermion partners nearly degenerate in mass with the
dark matter. We then highlight the most interesting phenomenological aspects of
charged mediator models relevant for current and future searches for new
physics. We describe precision measurements of SM fermion dipole moments,
including models with scalar muon partners that can account for $g_\mu-2$. We
discuss new search strategies for charged mediators at the LHC and the
projected sensitivity of future lepton colliders. We summarize constraints from
direct detection and demonstrate how next generation experiments might probe
QCD-charged mediators at mass scales beyond the sensitivity of the LHC. We also
review the prospects for indirect detection of models with scalar lepton
partners, focusing on the sensitivity of gamma-ray searches to internal
bremsstrahlung emission.
| [
{
"created": "Tue, 15 Mar 2022 17:34:22 GMT",
"version": "v1"
}
] | 2022-03-16 | [
[
"Ghosh",
"Tathagata",
""
],
[
"Kelso",
"Chris",
""
],
[
"Kumar",
"Jason",
""
],
[
"Sandick",
"Pearl",
""
],
[
"Stengel",
"Patrick",
""
]
] | We review simplified models in which a singlet Majorana dark matter candidate couples to Standard Model (SM) fermions through interactions mediated by scalar fermion partners. We summarize the two primary production mechanisms in these scenarios: dark matter annihilation mediated by first or second generation scalar fermion partners with significant left-right chiral mixing and co-annihilation with scalar fermion partners nearly degenerate in mass with the dark matter. We then highlight the most interesting phenomenological aspects of charged mediator models relevant for current and future searches for new physics. We describe precision measurements of SM fermion dipole moments, including models with scalar muon partners that can account for $g_\mu-2$. We discuss new search strategies for charged mediators at the LHC and the projected sensitivity of future lepton colliders. We summarize constraints from direct detection and demonstrate how next generation experiments might probe QCD-charged mediators at mass scales beyond the sensitivity of the LHC. We also review the prospects for indirect detection of models with scalar lepton partners, focusing on the sensitivity of gamma-ray searches to internal bremsstrahlung emission. |
hep-ph/9804303 | Holger Gies | Holger Gies, Walter Dittrich (Tubingen U.) | Light Propagation in Non-Trivial QED Vacua | 6 pages, REVTeX | Phys.Lett. B431 (1998) 420-429 | 10.1016/S0370-2693(98)00572-3 | null | hep-ph hep-th | null | Within the geometric optics approximation, we derive the light cone condition
for a class of homogeneous non-trivial QED vacua using the effective action
approach. Our result generalizes the ``unified formula'' suggested by Latorre,
Pascual and Tarrach which turns out to be a low-energy limit. We calculate the
velocity shifts induced by electromagnetic fields and finite temperature and
especially analyze the high-energy limit consistent with the loop
approximation.
| [
{
"created": "Thu, 16 Apr 1998 14:11:28 GMT",
"version": "v1"
}
] | 2009-10-31 | [
[
"Gies",
"Holger",
"",
"Tubingen U."
],
[
"Dittrich",
"Walter",
"",
"Tubingen U."
]
] | Within the geometric optics approximation, we derive the light cone condition for a class of homogeneous non-trivial QED vacua using the effective action approach. Our result generalizes the ``unified formula'' suggested by Latorre, Pascual and Tarrach which turns out to be a low-energy limit. We calculate the velocity shifts induced by electromagnetic fields and finite temperature and especially analyze the high-energy limit consistent with the loop approximation. |
hep-ph/0008258 | Robert Foot | P. Di Bari and R. Foot | Active-Sterile neutrino oscillations and BBN+CMBR constraints | Some changes, to appear in Phys. Rev. D | Phys.Rev. D63 (2001) 043008 | 10.1103/PhysRevD.63.043008 | null | hep-ph astro-ph | null | We show how active-sterile neutrino oscillations in the early Universe can
play an interesting role in explaining the current observations of CMBR
anisotropies and light element abundances. We describe different possible
phenomenological scenarios in the interpretation of present data and how
active-sterile neutrino oscillations can provide a viable theoretical
framework.
| [
{
"created": "Thu, 24 Aug 2000 13:12:11 GMT",
"version": "v1"
},
{
"created": "Wed, 13 Sep 2000 22:40:19 GMT",
"version": "v2"
},
{
"created": "Mon, 13 Nov 2000 06:14:42 GMT",
"version": "v3"
}
] | 2009-10-31 | [
[
"Di Bari",
"P.",
""
],
[
"Foot",
"R.",
""
]
] | We show how active-sterile neutrino oscillations in the early Universe can play an interesting role in explaining the current observations of CMBR anisotropies and light element abundances. We describe different possible phenomenological scenarios in the interpretation of present data and how active-sterile neutrino oscillations can provide a viable theoretical framework. |
hep-ph/9907255 | D. R. T. Jones | I. Jack and D.R.T. Jones | RG invariant solutions for the soft supersymmetry breaking parameters | 12 pages, TeX, uses Harvmac (big). Final published version, with
typos corrected and the discussion generalised to a direct product group | Phys.Lett. B465 (1999) 148-154 | 10.1016/S0370-2693(99)01064-3 | LTH 454 | hep-ph | null | We show that the results for the soft couplings in supersymmetric gauge
theories recently derived via the superconformal anomaly are equivalent to
results obtained earlier from a consideration of exact RG-invariant
trajectories. We give a full proof of these results for a general
multi-coupling theory. Moreover, we demonstrate the existence of a distinct
finite RG-invariant solution for the soft couplings in the case when the
unbroken supersymmetric theory is finite.
| [
{
"created": "Tue, 6 Jul 1999 16:26:07 GMT",
"version": "v1"
},
{
"created": "Thu, 28 Oct 1999 13:24:12 GMT",
"version": "v2"
}
] | 2009-10-31 | [
[
"Jack",
"I.",
""
],
[
"Jones",
"D. R. T.",
""
]
] | We show that the results for the soft couplings in supersymmetric gauge theories recently derived via the superconformal anomaly are equivalent to results obtained earlier from a consideration of exact RG-invariant trajectories. We give a full proof of these results for a general multi-coupling theory. Moreover, we demonstrate the existence of a distinct finite RG-invariant solution for the soft couplings in the case when the unbroken supersymmetric theory is finite. |
1810.08631 | Daniel Egana-Ugrinovic | Daniel Egana-Ugrinovic, Scott Thomas | Higgs Boson Contributions to the Electron Electric Dipole Moment | 38 pages, 11 figures | null | null | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The contributions of a second Higgs doublet to the electron electric dipole
moment near the heavy Higgs decoupling limit are determined within an effective
field theory framework. In models that satisfy the Glashow-Weinberg condition,
the leading contributions in this limit at effective dimension six are shown to
come from two-loop Barr-Zee diagrams that include the Standard Model-like Higgs
boson. Additional diagrams that include heavy Higgs bosons are sub-leading and
contribute only at effective dimension eight near the decoupling limit. This
simplification implies that to leading order in this limit, contributions of a
second Higgs doublet to the electron electric dipole moment can be couched
entirely in terms of the ratio of Higgs doublet expectation values and a single
universal phase appearing in the effective couplings of the Standard Model-like
Higgs boson to fermions, without direct reference to the heavy Higgs boson
masses or couplings. The recent bound from the ACME II experiment constrains
the phases of the couplings of the Standard Model-like Higgs boson to up-type
quarks and leptons at the part per mil level in Type I and IV two Higgs doublet
models. In Type II and III models these phases are constrained at the two parts
per mil or better level except in a tiny sliver of parameter space with nearly
equal Higgs doublet expectation values where destructive interference among
contributing diagrams happens to occur. In a more general phenomenological
parameterization with individual effective phases in the couplings of the
Standard Model-like Higgs boson to third generation fermions and the electron,
the top quark and electron coupling phases are constrained at the part per mil
level except in tiny slivers of parameter space, while the bottom quark and
tau-lepton coupling phases are constrained only at the thirty percent level.
| [
{
"created": "Fri, 19 Oct 2018 18:12:13 GMT",
"version": "v1"
}
] | 2018-10-23 | [
[
"Egana-Ugrinovic",
"Daniel",
""
],
[
"Thomas",
"Scott",
""
]
] | The contributions of a second Higgs doublet to the electron electric dipole moment near the heavy Higgs decoupling limit are determined within an effective field theory framework. In models that satisfy the Glashow-Weinberg condition, the leading contributions in this limit at effective dimension six are shown to come from two-loop Barr-Zee diagrams that include the Standard Model-like Higgs boson. Additional diagrams that include heavy Higgs bosons are sub-leading and contribute only at effective dimension eight near the decoupling limit. This simplification implies that to leading order in this limit, contributions of a second Higgs doublet to the electron electric dipole moment can be couched entirely in terms of the ratio of Higgs doublet expectation values and a single universal phase appearing in the effective couplings of the Standard Model-like Higgs boson to fermions, without direct reference to the heavy Higgs boson masses or couplings. The recent bound from the ACME II experiment constrains the phases of the couplings of the Standard Model-like Higgs boson to up-type quarks and leptons at the part per mil level in Type I and IV two Higgs doublet models. In Type II and III models these phases are constrained at the two parts per mil or better level except in a tiny sliver of parameter space with nearly equal Higgs doublet expectation values where destructive interference among contributing diagrams happens to occur. In a more general phenomenological parameterization with individual effective phases in the couplings of the Standard Model-like Higgs boson to third generation fermions and the electron, the top quark and electron coupling phases are constrained at the part per mil level except in tiny slivers of parameter space, while the bottom quark and tau-lepton coupling phases are constrained only at the thirty percent level. |
hep-ph/0312022 | St\'ephane Munier | S. Munier (Ecole polytechnique), A. Shoshi (Columbia University) | Diffractive photon dissociation in the saturation regime from the Good
and Walker picture | 17 pages, 7 figures, revtex | Phys.Rev. D69 (2004) 074022 | 10.1103/PhysRevD.69.074022 | CPHT-RR.110.1203, CU-TP-1102 | hep-ph | null | Combining the QCD dipole model with the Good and Walker picture, we formulate
diffractive dissociation of a photon of virtuality Q^2 off a hadronic target,
in the kinematical regime in which Q is close to the saturation scale and much
smaller than the invariant mass of the diffracted system. We show how the
obtained formula compares to the HERA data and discuss what can be learnt from
such a phenomenology. In particular, we argue that diffractive observables in
these kinematics provide useful pieces of information on the saturation regime
of QCD.
| [
{
"created": "Mon, 1 Dec 2003 18:45:49 GMT",
"version": "v1"
}
] | 2009-11-10 | [
[
"Munier",
"S.",
"",
"Ecole polytechnique"
],
[
"Shoshi",
"A.",
"",
"Columbia University"
]
] | Combining the QCD dipole model with the Good and Walker picture, we formulate diffractive dissociation of a photon of virtuality Q^2 off a hadronic target, in the kinematical regime in which Q is close to the saturation scale and much smaller than the invariant mass of the diffracted system. We show how the obtained formula compares to the HERA data and discuss what can be learnt from such a phenomenology. In particular, we argue that diffractive observables in these kinematics provide useful pieces of information on the saturation regime of QCD. |
2209.13419 | Min He | Min He and Ralf Rapp | Bottom hadro-chemistry in high-energy hadronic collisions | 6 pages, 4 figures | Phys.Rev.Lett. 131 (2023) 1, 012301 | 10.1103/PhysRevLett.131.012301 | null | hep-ph hep-ex nucl-ex nucl-th | http://creativecommons.org/publicdomain/zero/1.0/ | The hadro-chemistry of bottom quarks ($b$) produced in hadronic collisions
encodes valuable information on the mechanism of color-neutralization in these
reactions. Since the $b$-quark mass is much larger than the typical hadronic
scale of $\sim$1\,GeV, $b\bar b$ pair production is expected to be well
separated from subsequent hadronization processes. A significantly larger
fraction of $b$ baryons has been observed in proton-proton ($pp$) and
proton-antiproton ($p\bar{p}$) reactions relative to $e^+e^-$ collisions,
challenging theoretical descriptions. We address this problem by employing a
statistical hadronization approach with an augmented set of $b$-hadron states
beyond currently measured ones, guided by the relativistic quark model and
lattice-QCD computations. Assuming {\it relative} chemical equilibrium between
different $b$-hadron yields, thermal densities are used as fragmentation
weights of $b$-quarks into various hadron species. With quark model estimates
of the decay patterns of excited states, the fragmentation fractions of
weakly-decaying $b$ hadrons are computed and found to agree with measurements
in $p\bar{p}$ collisions at the Tevatron. By combining transverse-momentum
($p_T$) distributions of $b$-quarks from perturbative QCD with thermal weights
and independent fragmentation toward high $p_T$, a fair description of the
$p_T$-dependent $\bar{B}_s^0/B^-$ and $\Lambda_b^0/B^-$ ratios measured in $pp$
collisions at the LHC is obtained. Finally, we implement the hadro-chemistry
into a strongly-coupled transport approach for $b$-quarks in heavy-ion
collisions, utilizing previously determined $b$-quark transport coefficients in
the Quark-Gluon Plasma, to highlight the modifications of hadro-chemistry and
collective behavior of $b$ hadrons in Pb-Pb collisions at the LHC.
| [
{
"created": "Tue, 27 Sep 2022 14:18:34 GMT",
"version": "v1"
},
{
"created": "Fri, 7 Jul 2023 09:23:03 GMT",
"version": "v2"
}
] | 2023-07-19 | [
[
"He",
"Min",
""
],
[
"Rapp",
"Ralf",
""
]
] | The hadro-chemistry of bottom quarks ($b$) produced in hadronic collisions encodes valuable information on the mechanism of color-neutralization in these reactions. Since the $b$-quark mass is much larger than the typical hadronic scale of $\sim$1\,GeV, $b\bar b$ pair production is expected to be well separated from subsequent hadronization processes. A significantly larger fraction of $b$ baryons has been observed in proton-proton ($pp$) and proton-antiproton ($p\bar{p}$) reactions relative to $e^+e^-$ collisions, challenging theoretical descriptions. We address this problem by employing a statistical hadronization approach with an augmented set of $b$-hadron states beyond currently measured ones, guided by the relativistic quark model and lattice-QCD computations. Assuming {\it relative} chemical equilibrium between different $b$-hadron yields, thermal densities are used as fragmentation weights of $b$-quarks into various hadron species. With quark model estimates of the decay patterns of excited states, the fragmentation fractions of weakly-decaying $b$ hadrons are computed and found to agree with measurements in $p\bar{p}$ collisions at the Tevatron. By combining transverse-momentum ($p_T$) distributions of $b$-quarks from perturbative QCD with thermal weights and independent fragmentation toward high $p_T$, a fair description of the $p_T$-dependent $\bar{B}_s^0/B^-$ and $\Lambda_b^0/B^-$ ratios measured in $pp$ collisions at the LHC is obtained. Finally, we implement the hadro-chemistry into a strongly-coupled transport approach for $b$-quarks in heavy-ion collisions, utilizing previously determined $b$-quark transport coefficients in the Quark-Gluon Plasma, to highlight the modifications of hadro-chemistry and collective behavior of $b$ hadrons in Pb-Pb collisions at the LHC. |
0708.3803 | Konrad Tywoniuk | I. C. Arsene (University of Oslo), L. Bravina (University of Oslo,
Moscow State University), A. B. Kaidalov (ITEP, Moscow), K. Tywoniuk
(University of Oslo) and E. Zabrodin (University of Oslo, Moscow State
University) | Multiplicity and cold-nuclear matter effects from Glauber-Gribov theory
at LHC | 2 pages,3 figures, submitted to proceedings of "Heavy Ion Collisions
at LHC - Last Call for Predictions" (corrected version) | null | null | null | hep-ph | null | We present predictions for nuclear modification factor in proton-lead
collisions at LHC energy 5.5 TeV from Glauber-Gribov theory of nuclear
shadowing. We have also made predictions for baseline cold-matter nuclear
effects in lead-lead collisions at the same energy.
| [
{
"created": "Tue, 28 Aug 2007 15:28:31 GMT",
"version": "v1"
}
] | 2007-08-29 | [
[
"Arsene",
"I. C.",
"",
"University of Oslo"
],
[
"Bravina",
"L.",
"",
"University of Oslo,\n Moscow State University"
],
[
"Kaidalov",
"A. B.",
"",
"ITEP, Moscow"
],
[
"Tywoniuk",
"K.",
"",
"University of Oslo"
],
[
"Zabrodin",
... | We present predictions for nuclear modification factor in proton-lead collisions at LHC energy 5.5 TeV from Glauber-Gribov theory of nuclear shadowing. We have also made predictions for baseline cold-matter nuclear effects in lead-lead collisions at the same energy. |
hep-ph/0006095 | T. Goldman | G.J. Stephenson, Jr. (1), T. Goldman (2) and B.H.J. McKellar (3) ((1)
U. of New Mexico, (2) Los Alamos National Lab., (3) U. of Melbourne) | Tritium Beta Decay, Neutrino Mass Matrices and Interactions Beyond the
Standard Model | 32 pages, LaTeX, 6 figures, PostScript; full discussion and changes
in notation from Phys. Lett. B440 (1998) 89, nucl-th/9807057; submitted to
Phys. Rev. D | Phys.Rev.D62:093013,2000 | 10.1103/PhysRevD.62.093013 | LA-UR-00-1327, UM-P-2000/013 | hep-ph nucl-ex nucl-th | null | The interference of charge-changing interactions, weaker than the V-A
Standard Model (SM) interaction and having a different Lorentz structure, with
that SM interaction, can, in principle, produce effects near the end point of
the Tritium beta decay spectrum which are of a different character from those
produced by the purely kinematic effect of neutrino mass expected in the
simplest extension of the SM. We show that the existence of more than one mass
eigenstate can lead to interference effects at the end point that are stronger
than those occurring over the entire spectrum. We discuss these effects both
for the special case of Dirac neutrinos and the more general case of Majorana
neutrinos and show that, for the present precision of the experiments, one
formula should suffice to express the interference effects in all cases.
Implications for "sterile" neutrinos are noted.
| [
{
"created": "Fri, 9 Jun 2000 23:51:17 GMT",
"version": "v1"
}
] | 2012-08-27 | [
[
"Stephenson,",
"G. J.",
"Jr."
],
[
"Goldman",
"T.",
""
],
[
"McKellar",
"B. H. J.",
""
]
] | The interference of charge-changing interactions, weaker than the V-A Standard Model (SM) interaction and having a different Lorentz structure, with that SM interaction, can, in principle, produce effects near the end point of the Tritium beta decay spectrum which are of a different character from those produced by the purely kinematic effect of neutrino mass expected in the simplest extension of the SM. We show that the existence of more than one mass eigenstate can lead to interference effects at the end point that are stronger than those occurring over the entire spectrum. We discuss these effects both for the special case of Dirac neutrinos and the more general case of Majorana neutrinos and show that, for the present precision of the experiments, one formula should suffice to express the interference effects in all cases. Implications for "sterile" neutrinos are noted. |
1612.02613 | Ju-Jun Xie | Xu Zhang, Ju-Jun Xie, and Xurong Chen | Faddeev fixed center approximation to $\pi \bar{K} K^*$ system and the
$\pi_1(1600)$ | 6 pages, 5 figures. To match the published version in PRD | Phys. Rev. D 95, 056014 (2017) | 10.1103/PhysRevD.95.056014 | null | hep-ph hep-ex nucl-ex nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We investigate the three-body system of $\pi \bar{K} K^*$ by using the
fixed-center approximation to the Faddeev equation, taking the interaction
between $\pi$ and $\bar{K}$, $\pi$ and $K^*$, and $\bar{K}$ and $K^*$ from the
chiral unitary approach. The study is made assuming scattering of a $\pi$ on a
$\bar{K} K^*$ cluster, which is known to generate the $f_1(1285)$ state. The
resonant structure around $1650$ MeV shows up in the modulus squared of the
$\pi$-$(\bar{K} K^*)_{f_1(1285)}$ scattering amplitude and suggests that a
$\pi$-$(\bar{K} K^*)_{f_1(1285)}$ state, with "exotic" quantum numbers $J^{PC}
= 1^{-+}$, can be formed. This state can be identified as the observed
$\pi_1(1600)$ resonance. We suggest that this is the origin of the present
$\pi_1(1600)$ resonance and propose to look at the $\pi f_1(1285)$ mode in
future experiments to clarify the issue.
| [
{
"created": "Thu, 8 Dec 2016 12:15:02 GMT",
"version": "v1"
},
{
"created": "Mon, 12 Dec 2016 15:34:51 GMT",
"version": "v2"
},
{
"created": "Thu, 9 Mar 2017 09:07:33 GMT",
"version": "v3"
}
] | 2017-03-22 | [
[
"Zhang",
"Xu",
""
],
[
"Xie",
"Ju-Jun",
""
],
[
"Chen",
"Xurong",
""
]
] | We investigate the three-body system of $\pi \bar{K} K^*$ by using the fixed-center approximation to the Faddeev equation, taking the interaction between $\pi$ and $\bar{K}$, $\pi$ and $K^*$, and $\bar{K}$ and $K^*$ from the chiral unitary approach. The study is made assuming scattering of a $\pi$ on a $\bar{K} K^*$ cluster, which is known to generate the $f_1(1285)$ state. The resonant structure around $1650$ MeV shows up in the modulus squared of the $\pi$-$(\bar{K} K^*)_{f_1(1285)}$ scattering amplitude and suggests that a $\pi$-$(\bar{K} K^*)_{f_1(1285)}$ state, with "exotic" quantum numbers $J^{PC} = 1^{-+}$, can be formed. This state can be identified as the observed $\pi_1(1600)$ resonance. We suggest that this is the origin of the present $\pi_1(1600)$ resonance and propose to look at the $\pi f_1(1285)$ mode in future experiments to clarify the issue. |
2208.02604 | Sergey Afonin | Sergey Afonin and Timofey Solomko | Cornell potential in generalized Soft Wall holographic model | 25 pages, 8 figures | J. Phys. G: Nucl. Part. Phys. 49 (2022) 105003 | 10.1088/1361-6471/ac8697 | null | hep-ph hep-th nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We derive and analyze the confinement potential of the Cornell type within
the framework of the generalized Soft Wall holographic model that includes a
parameter controlling the intercept of the linear Regge spectrum. In the
phenomenology of Regge trajectories, this parameter is very important for the
quantitative description of experimental data. Our analysis shows that the
''linear plus Coulomb'' confinement potential obtained in the scalar channel is
quantitatively consistent with the phenomenology and lattice simulations while
the agreement in the vector channel is qualitative only. This result indicates
the key role of the vacuum scalar sector in the formation of the confinement
potential. As a by-product the overall consistency of our holographic
description of confinement potential seems to confirm the glueball nature of
the scalar meson $f_0(1500)$.
| [
{
"created": "Thu, 4 Aug 2022 12:10:12 GMT",
"version": "v1"
}
] | 2022-08-30 | [
[
"Afonin",
"Sergey",
""
],
[
"Solomko",
"Timofey",
""
]
] | We derive and analyze the confinement potential of the Cornell type within the framework of the generalized Soft Wall holographic model that includes a parameter controlling the intercept of the linear Regge spectrum. In the phenomenology of Regge trajectories, this parameter is very important for the quantitative description of experimental data. Our analysis shows that the ''linear plus Coulomb'' confinement potential obtained in the scalar channel is quantitatively consistent with the phenomenology and lattice simulations while the agreement in the vector channel is qualitative only. This result indicates the key role of the vacuum scalar sector in the formation of the confinement potential. As a by-product the overall consistency of our holographic description of confinement potential seems to confirm the glueball nature of the scalar meson $f_0(1500)$. |
hep-ph/9610478 | Alexey Petrov | John F. Donoghue, Alexey A. Petrov (University of Massachusetts) | Factorization in non-leptonic decays of heavy mesons | 10 pages, RevTex, 1 figure | Phys.Lett. B393 (1997) 149-154 | 10.1016/S0370-2693(96)01607-3 | UMHEP-432 | hep-ph | null | We propose a QCD-based model for calculation of the non-perturbative
corrections to the factorization approximation in the decays of heavy mesons.
In the framework of the model, factorization in pseudoscalar transitions holds
exactly at the leading order leaving the opportunity to calculate non-leading
corrections consistently.
| [
{
"created": "Thu, 24 Oct 1996 22:27:31 GMT",
"version": "v1"
}
] | 2009-10-30 | [
[
"Donoghue",
"John F.",
"",
"University of Massachusetts"
],
[
"Petrov",
"Alexey A.",
"",
"University of Massachusetts"
]
] | We propose a QCD-based model for calculation of the non-perturbative corrections to the factorization approximation in the decays of heavy mesons. In the framework of the model, factorization in pseudoscalar transitions holds exactly at the leading order leaving the opportunity to calculate non-leading corrections consistently. |
hep-ph/9801216 | Jezykmil | Malgorzata Bakalarska and Waclaw Tybor (Theoretical Physics Department
I, University of Lodz, Poland) | On The Deser-Siegel-Townsend Notivarg | 14 pages | null | null | null | hep-ph hep-th | null | The interaction of the notivarg with an external Weyl current is discussed.
The continuity equation for the Weyl current is obtained. The canonical
analysis of the theory of the notivarg interacting with the external Weyl
current is performed. The covariant propagator of the notivarg is found.
| [
{
"created": "Mon, 5 Jan 1998 14:13:55 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Bakalarska",
"Malgorzata",
"",
"Theoretical Physics Department\n I, University of Lodz, Poland"
],
[
"Tybor",
"Waclaw",
"",
"Theoretical Physics Department\n I, University of Lodz, Poland"
]
] | The interaction of the notivarg with an external Weyl current is discussed. The continuity equation for the Weyl current is obtained. The canonical analysis of the theory of the notivarg interacting with the external Weyl current is performed. The covariant propagator of the notivarg is found. |
1701.03284 | Run-Hui Li | Run-Hui Li, Cai-Dian L\"u, Wei Wang, Fu-Sheng Yu, Zhi-Tian Zou | Doubly-Heavy Baryon Weak Decays: $\Xi_{bc}^{0}\to pK^{-}$ and
$\Xi_{cc}^{+}\to \Sigma_{c}^{++}(2520)K^{-}$ | 10 pages; 2 figures; version published on Physics Letters B | Physics Letters B 767(2017) 232-235 | 10.1016/j.physletb.2017.02.003 | null | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Doubly-heavy baryons, with two heavy and one light quarks, are expected to
exist in QCD and their masses have been predicted in the quark model. However
their existence is not well established so far in experiment. In this work, we
explore the possibility of searching for $\Xi_{bc}$ and $\Xi_{cc}^{+}$ in the
$W$-exchange processes, $\Xi_{bc}^{0}\to pK^{-}$ and $\Xi_{cc}^{+}\to
\Sigma_{c}^{++}(2520)K^{-}$. On the basis of perturbative calculations, we
estimate the branching ratio of the first decay as ${\cal BR}(\Xi_{bc}^0\to p^+
K^-)\approx3.21\times {\cal R}^2_f \times {\cal R}_{\tau}\times 10^{-7}$, where
${\cal R}_f$ (${\cal R}_{\tau}$) are the ratios of the decay constants
(lifetimes) of $\Xi_{bc}^{0}$ and $\Lambda_b^{0}$. The branching ratio of
$\Xi_{cc}^{+}\to \Sigma_{c}^{++}(2520)K^{-}$ is related to that of
$\Lambda_c^+\to \Delta^{++} K^-$, and thereby a conjectured topology analysis
leads to the range for the branching ratio as: ${\cal BR}(\Xi_{cc}^+\to
\Sigma_{c}^{++}(2520) K^-)\in \left[0.36\%,1.80\%\right]$. The decay
$\Xi_{cc}^+\to \Sigma_{c}^{++}(2520) K^-$ would be reconstructed in the $
\Lambda_{c}^{+}K^{-}\pi^{+}$ final state which is easy to access even at a
hadron collider. Based on the two facts that abundant heavy quarks can be
produced at a hadron collider like LHC, and the branching ratios of
$\Xi_{bc}^{0}\to pK^{-}$ and $\Xi_{cc}^{+}\to \Sigma_{c}^{++}(2520)K^{-}$ are
sizable, we urge our experimental colleagues to perform a search at LHCb. This
will presumably lead to the discovery of the $\Xi_{bc}$ and $\Xi_{cc}^{+}$ ,
and precision measurements of the branching ratios in the future are helpful to
investigate their decay mechanism.
| [
{
"created": "Thu, 12 Jan 2017 09:57:24 GMT",
"version": "v1"
},
{
"created": "Fri, 17 Feb 2017 02:53:34 GMT",
"version": "v2"
}
] | 2017-02-20 | [
[
"Li",
"Run-Hui",
""
],
[
"Lü",
"Cai-Dian",
""
],
[
"Wang",
"Wei",
""
],
[
"Yu",
"Fu-Sheng",
""
],
[
"Zou",
"Zhi-Tian",
""
]
] | Doubly-heavy baryons, with two heavy and one light quarks, are expected to exist in QCD and their masses have been predicted in the quark model. However their existence is not well established so far in experiment. In this work, we explore the possibility of searching for $\Xi_{bc}$ and $\Xi_{cc}^{+}$ in the $W$-exchange processes, $\Xi_{bc}^{0}\to pK^{-}$ and $\Xi_{cc}^{+}\to \Sigma_{c}^{++}(2520)K^{-}$. On the basis of perturbative calculations, we estimate the branching ratio of the first decay as ${\cal BR}(\Xi_{bc}^0\to p^+ K^-)\approx3.21\times {\cal R}^2_f \times {\cal R}_{\tau}\times 10^{-7}$, where ${\cal R}_f$ (${\cal R}_{\tau}$) are the ratios of the decay constants (lifetimes) of $\Xi_{bc}^{0}$ and $\Lambda_b^{0}$. The branching ratio of $\Xi_{cc}^{+}\to \Sigma_{c}^{++}(2520)K^{-}$ is related to that of $\Lambda_c^+\to \Delta^{++} K^-$, and thereby a conjectured topology analysis leads to the range for the branching ratio as: ${\cal BR}(\Xi_{cc}^+\to \Sigma_{c}^{++}(2520) K^-)\in \left[0.36\%,1.80\%\right]$. The decay $\Xi_{cc}^+\to \Sigma_{c}^{++}(2520) K^-$ would be reconstructed in the $ \Lambda_{c}^{+}K^{-}\pi^{+}$ final state which is easy to access even at a hadron collider. Based on the two facts that abundant heavy quarks can be produced at a hadron collider like LHC, and the branching ratios of $\Xi_{bc}^{0}\to pK^{-}$ and $\Xi_{cc}^{+}\to \Sigma_{c}^{++}(2520)K^{-}$ are sizable, we urge our experimental colleagues to perform a search at LHCb. This will presumably lead to the discovery of the $\Xi_{bc}$ and $\Xi_{cc}^{+}$ , and precision measurements of the branching ratios in the future are helpful to investigate their decay mechanism. |
1808.04727 | Tega Edo | T. B. Edo | Momentum chromospin classification of the fundamental fermions and
bosons | Changed 'isospin' tag to 'chromospin' for disambiguation. Fixed typo
in lepton section where tau neutrino is swap with anti-partner | null | null | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present a momentum chromospin scheme, the $\mathsf{KSC}$-{\it framework},
for parametrizing the elementary particles using the underlying connection
between their internal symmetries and their electromagnetic field boundaries.
The linear momentum (or $\mathsf{K}$) chromospin branch of the framework deals
with electric charge information, including the emergence of quantum
chromodynamics color from fractional electric charges and its effect on quark
confinement, while the angular momentum (or $\mathsf{S}$) chromospin branch of
the framework develops the theory of spin to address the issue of three fermion
generations.
| [
{
"created": "Mon, 13 Aug 2018 13:07:51 GMT",
"version": "v1"
},
{
"created": "Tue, 11 Sep 2018 09:46:28 GMT",
"version": "v2"
},
{
"created": "Sat, 24 Nov 2018 12:47:04 GMT",
"version": "v3"
}
] | 2018-11-27 | [
[
"Edo",
"T. B.",
""
]
] | We present a momentum chromospin scheme, the $\mathsf{KSC}$-{\it framework}, for parametrizing the elementary particles using the underlying connection between their internal symmetries and their electromagnetic field boundaries. The linear momentum (or $\mathsf{K}$) chromospin branch of the framework deals with electric charge information, including the emergence of quantum chromodynamics color from fractional electric charges and its effect on quark confinement, while the angular momentum (or $\mathsf{S}$) chromospin branch of the framework develops the theory of spin to address the issue of three fermion generations. |
2003.11615 | Radja Boughezal | Simone Alioli, Radja Boughezal, Emanuele Mereghetti and Frank
Petriello | Novel angular dependence in Drell-Yan lepton production via dimension-8
operators | 6 pages, 1 figure | null | 10.1016/j.physletb.2020.135703 | LA-UR-20-22498 | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the effects of dimension-8 operators on Drell-Yan production of
lepton pairs at the Large Hadron Collider (LHC). We identify a class of
operators that leads to novel angular dependence not accounted for in current
analyses. The observation of such effects would be a smoking-gun signature of
new physics appearing at the dimension-8 level. We propose an extension of the
currently used angular basis and show that these effects should be observable
in future LHC analyses for realistic values of the associated dimension-8
Wilson coefficients.
| [
{
"created": "Wed, 25 Mar 2020 20:25:06 GMT",
"version": "v1"
}
] | 2020-08-26 | [
[
"Alioli",
"Simone",
""
],
[
"Boughezal",
"Radja",
""
],
[
"Mereghetti",
"Emanuele",
""
],
[
"Petriello",
"Frank",
""
]
] | We study the effects of dimension-8 operators on Drell-Yan production of lepton pairs at the Large Hadron Collider (LHC). We identify a class of operators that leads to novel angular dependence not accounted for in current analyses. The observation of such effects would be a smoking-gun signature of new physics appearing at the dimension-8 level. We propose an extension of the currently used angular basis and show that these effects should be observable in future LHC analyses for realistic values of the associated dimension-8 Wilson coefficients. |
1606.09519 | Jonas Michael Lindert | Daniel de Florian, Massimiliano Grazzini, Catalin Hanga, Stefan
Kallweit, Jonas M. Lindert, Philipp Maierh\"ofer, Javier Mazzitelli, Dirk
Rathlev | Differential Higgs Boson Pair Production at Next-to-Next-to-Leading
Order in QCD | 16 pages, 7 figures | null | 10.1007/JHEP09(2016)151 | DESY 16-107, FR-PHENO-2016-007, ICAS 08/16, MITP/16-061, ZU-TH 20/16 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We report on the first fully differential calculation for double Higgs boson
production through gluon fusion in hadron collisions up to
next-to-next-to-leading order (NNLO) in QCD perturbation theory. The
calculation is performed in the heavy-top limit of the Standard Model, and in
the phenomenological results we focus on pp collisions at 14 TeV. We present
differential distributions through NNLO for various observables including the
transverse-momentum and rapidity distributions of the two Higgs bosons. NNLO
corrections are at the level of 10%-25% with respect to the next-to-leading
order (NLO) prediction with a residual scale uncertainty of 5%-15% and an
overall mild phase-space dependence. Only at NNLO the perturbative expansion
starts to converge yielding overlapping scale uncertainty bands between NNLO
and NLO in most of the phase-space. The calculation includes NLO predictions
for pp -> HH+jet+X. Corrections to the corresponding distributions exceed 50%
with a residual scale dependence of 20%-30%.
| [
{
"created": "Thu, 30 Jun 2016 14:48:22 GMT",
"version": "v1"
}
] | 2016-10-12 | [
[
"de Florian",
"Daniel",
""
],
[
"Grazzini",
"Massimiliano",
""
],
[
"Hanga",
"Catalin",
""
],
[
"Kallweit",
"Stefan",
""
],
[
"Lindert",
"Jonas M.",
""
],
[
"Maierhöfer",
"Philipp",
""
],
[
"Mazzitelli",
"Javie... | We report on the first fully differential calculation for double Higgs boson production through gluon fusion in hadron collisions up to next-to-next-to-leading order (NNLO) in QCD perturbation theory. The calculation is performed in the heavy-top limit of the Standard Model, and in the phenomenological results we focus on pp collisions at 14 TeV. We present differential distributions through NNLO for various observables including the transverse-momentum and rapidity distributions of the two Higgs bosons. NNLO corrections are at the level of 10%-25% with respect to the next-to-leading order (NLO) prediction with a residual scale uncertainty of 5%-15% and an overall mild phase-space dependence. Only at NNLO the perturbative expansion starts to converge yielding overlapping scale uncertainty bands between NNLO and NLO in most of the phase-space. The calculation includes NLO predictions for pp -> HH+jet+X. Corrections to the corresponding distributions exceed 50% with a residual scale dependence of 20%-30%. |
hep-ph/0210404 | Jonathan Butterworth | J. M. Butterworth, S. Butterworth | JetWeb: A WWW Interface and Database for Monte Carlo Tuning and
Validation | See http://jetweb.hep.ucl.ac.uk for further information | Comput.Phys.Commun. 153 (2003) 164-178 | 10.1016/S0010-4655(03)00208-X | UCL/HEP 2002-04 | hep-ph hep-ex | null | A World Wide Web interface to a Monte Carlo validation and tuning facility is
described. The aim of the package is to allow rapid and reproducible
comparisons to be made between detailed measurements at high-energy physics
colliders and general physics simulation packages. The package includes a
relational database, a Java servlet query and display facility, and clean
interfaces to simulation packages and their parameters.
| [
{
"created": "Tue, 29 Oct 2002 13:57:45 GMT",
"version": "v1"
}
] | 2009-11-07 | [
[
"Butterworth",
"J. M.",
""
],
[
"Butterworth",
"S.",
""
]
] | A World Wide Web interface to a Monte Carlo validation and tuning facility is described. The aim of the package is to allow rapid and reproducible comparisons to be made between detailed measurements at high-energy physics colliders and general physics simulation packages. The package includes a relational database, a Java servlet query and display facility, and clean interfaces to simulation packages and their parameters. |
hep-ph/0208244 | Toshihiko Komada | Daiki Ito (Nihon univ.), Muneyuki Ishida (Tokyo Inst. of Tech.), Shin
Ishida (Nihon univ.), Toshihiko Komada (Nihon univ.), Hiroshi Tonooka (Nihon
univ.) and Kenji Yamada (Nihon univ.) | Possible Evidence for a Chiral Particle D_1chi, Axial-Vector in the D
Meson System | 6 pages, 2 eps figures, uses ptptex.sty | null | null | null | hep-ph | null | In the covariant level-classification scheme of hadrons proposed recently,
the existence of "chiral particles", scalar and axial-vector mesons as the
partners of the ground-state pseudo-scalar and vector mesons, respectively,
were predicted in the D and B meson systems, realizing a linear representation
of chiral symmetry. In this work we reanalyze the D* pi mass spectra obtained
through the Upsilon (4S) and Z0 decays to show a possibility for the D_1chi.
| [
{
"created": "Tue, 27 Aug 2002 06:25:57 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Ito",
"Daiki",
"",
"Nihon univ."
],
[
"Ishida",
"Muneyuki",
"",
"Tokyo Inst. of Tech."
],
[
"Ishida",
"Shin",
"",
"Nihon univ."
],
[
"Komada",
"Toshihiko",
"",
"Nihon univ."
],
[
"Tonooka",
"Hiroshi",
"",
"Nihon\n un... | In the covariant level-classification scheme of hadrons proposed recently, the existence of "chiral particles", scalar and axial-vector mesons as the partners of the ground-state pseudo-scalar and vector mesons, respectively, were predicted in the D and B meson systems, realizing a linear representation of chiral symmetry. In this work we reanalyze the D* pi mass spectra obtained through the Upsilon (4S) and Z0 decays to show a possibility for the D_1chi. |
1803.04438 | Ivan Martinez Soler | Pilar Coloma, Jacobo Lopez-Pavon, Ivan Martinez-Soler and Hiroshi
Nunokawa | Decoherence in neutrino propagation through matter, and bounds from
IceCube/DeepCore | 31 pages, 8 figures | null | 10.1140/epjc/s10052-018-6092-6 | null | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We revisit neutrino oscillations in matter considering the open quantum
system framework which allows to introduce possible decoherence effects
generated by New Physics in a phenomenological manner. We assume that the
decoherence parameters $\gamma_{ij}$ may depend on the neutrino energy, as
$\gamma_{ij}=\gamma_{ij}^{0}(E/\text{GeV})^n$ $(n = 0,\pm1,\pm2) $. The case of
non-uniform matter is studied in detail, both within the adiabatic
approximation and in the more general non-adiabatic case. In particular, we
develop a consistent formalism to study the non-adiabatic case dividing the
matter profile into an arbitrary number of layers of constant densities. This
formalism is then applied to explore the sensitivity of IceCube and DeepCore to
this type of effects. Our study is the first atmospheric neutrino analysis
where a consistent treatment of the matter effects in the three-neutrino case
is performed in presence of decoherence. We show that matter effects are indeed
extremely relevant in this context. We find that IceCube is able to
considerably improve over current bounds in the solar sector ($\gamma_{21}$)
and in the atmospheric sector ($\gamma_{31}$ and $\gamma_{32}$) for $n=0,1,2$
and, in particular, by several orders of magnitude (between 3 and 9) for the
$n=1,2$ cases. For $n=0$ we find $\gamma_{32},\gamma_{31}< 4.0\cdot10^{-24}
(1.3\cdot10^{-24})$ GeV and $\gamma_{21}<1.3\cdot10^{-24} (4.1\cdot10^{-24})$
GeV, for normal (inverted) mass ordering.
| [
{
"created": "Mon, 12 Mar 2018 18:15:53 GMT",
"version": "v1"
},
{
"created": "Sat, 21 Jul 2018 08:54:51 GMT",
"version": "v2"
}
] | 2018-08-15 | [
[
"Coloma",
"Pilar",
""
],
[
"Lopez-Pavon",
"Jacobo",
""
],
[
"Martinez-Soler",
"Ivan",
""
],
[
"Nunokawa",
"Hiroshi",
""
]
] | We revisit neutrino oscillations in matter considering the open quantum system framework which allows to introduce possible decoherence effects generated by New Physics in a phenomenological manner. We assume that the decoherence parameters $\gamma_{ij}$ may depend on the neutrino energy, as $\gamma_{ij}=\gamma_{ij}^{0}(E/\text{GeV})^n$ $(n = 0,\pm1,\pm2) $. The case of non-uniform matter is studied in detail, both within the adiabatic approximation and in the more general non-adiabatic case. In particular, we develop a consistent formalism to study the non-adiabatic case dividing the matter profile into an arbitrary number of layers of constant densities. This formalism is then applied to explore the sensitivity of IceCube and DeepCore to this type of effects. Our study is the first atmospheric neutrino analysis where a consistent treatment of the matter effects in the three-neutrino case is performed in presence of decoherence. We show that matter effects are indeed extremely relevant in this context. We find that IceCube is able to considerably improve over current bounds in the solar sector ($\gamma_{21}$) and in the atmospheric sector ($\gamma_{31}$ and $\gamma_{32}$) for $n=0,1,2$ and, in particular, by several orders of magnitude (between 3 and 9) for the $n=1,2$ cases. For $n=0$ we find $\gamma_{32},\gamma_{31}< 4.0\cdot10^{-24} (1.3\cdot10^{-24})$ GeV and $\gamma_{21}<1.3\cdot10^{-24} (4.1\cdot10^{-24})$ GeV, for normal (inverted) mass ordering. |
2406.06209 | Suping Jin | Hua-Yu Jiang and Su-Ping Jin | Precision calculations of the $D_{(s)}D_{(s)}V$ and $B_{(s)}B_{(s)}V$
couplings from light-cone sum rules | 45 pages,5 figures and 12 tables | null | null | null | hep-ph hep-ex | http://creativecommons.org/licenses/by/4.0/ | We present an improved calculation of the $HHV$ ($H=D_{(s)},\, B_{(s)}$, $V=
\rho$, $K^\ast$, $\omega$, and $\phi$) coupling constants $g_{HHV}$ beyond
leading order in $\alpha_s$ from QCD light-cone sum rules (LCSRs) by means of
the light-cone distribution amplitudes (LCDAs) of light vector mesons. Near the
light-cone, the next-to-leading order QCD corrections for the
vacuum-to-vector-meson correlation function are included at leading power in
$\delta_V = m_V/m_Q$ ($Q=b,c$) within the framework of hard-collinear
factorization. The higher-twist corrections from two-particle and
three-particle vector meson LCDAs are systematically incorporated at leading
order in $\alpha_s$ by applying the method of background field in LCSRs. Based
on these improvements, we perform a systematic computation of the strong
coupling constants $g_{H HV}$ and extract the effective coupling $\beta$ of the
heavy meson chiral perturbation theory (HM$\chi$PT). Furthermore, we accomplish
the analysis for the relation between the coupling $g_{HHV}$ and the residue of
the $H\to V$ transition form factor $A_0$ at heavy pseudoscalar pole.
Additionally, we provide a detailed investigation of the $SU(3)$ flavour
symmetry breaking effects and conduct a comparative analysis with results from
previous studies.
| [
{
"created": "Mon, 10 Jun 2024 12:16:59 GMT",
"version": "v1"
}
] | 2024-06-11 | [
[
"Jiang",
"Hua-Yu",
""
],
[
"Jin",
"Su-Ping",
""
]
] | We present an improved calculation of the $HHV$ ($H=D_{(s)},\, B_{(s)}$, $V= \rho$, $K^\ast$, $\omega$, and $\phi$) coupling constants $g_{HHV}$ beyond leading order in $\alpha_s$ from QCD light-cone sum rules (LCSRs) by means of the light-cone distribution amplitudes (LCDAs) of light vector mesons. Near the light-cone, the next-to-leading order QCD corrections for the vacuum-to-vector-meson correlation function are included at leading power in $\delta_V = m_V/m_Q$ ($Q=b,c$) within the framework of hard-collinear factorization. The higher-twist corrections from two-particle and three-particle vector meson LCDAs are systematically incorporated at leading order in $\alpha_s$ by applying the method of background field in LCSRs. Based on these improvements, we perform a systematic computation of the strong coupling constants $g_{H HV}$ and extract the effective coupling $\beta$ of the heavy meson chiral perturbation theory (HM$\chi$PT). Furthermore, we accomplish the analysis for the relation between the coupling $g_{HHV}$ and the residue of the $H\to V$ transition form factor $A_0$ at heavy pseudoscalar pole. Additionally, we provide a detailed investigation of the $SU(3)$ flavour symmetry breaking effects and conduct a comparative analysis with results from previous studies. |
1505.07410 | Isabel Garc\'ia Garc\'ia | Isabel Garc\'ia Garc\'ia, Robert Lasenby, John March-Russell | Twin Higgs Asymmetric Dark Matter | 6 pages, 3 figures; references added, shortened version published in
PRL | Phys. Rev. Lett. 115, 121801 (2015) | 10.1103/PhysRevLett.115.121801 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study Asymmetric Dark Matter (ADM) in the context of the minimal
(Fraternal) Twin Higgs solution to the little hierarchy problem, with a twin
sector with gauged $SU(3)' \times SU(2)'$, a twin Higgs, and only third
generation twin fermions. Naturalness requires the QCD$^\prime$ scale
$\Lambda'_{\rm QCD} \simeq 0.5 - 20 \ {\rm GeV}$, and $t'$ to be heavy. We
focus on the light $b'$ quark regime, $m_{b'} \lesssim \Lambda'_{\rm QCD}$,
where QCD$^\prime$ is characterised by a single scale $\Lambda'_{\rm QCD}$ with
no light pions. A twin baryon number asymmetry leads to a successful DM
candidate: the spin-3/2 twin baryon, $\Delta' \sim b'b'b'$, with a dynamically
determined mass ($\sim 5 \Lambda'_{\rm QCD}$) in the preferred range for the
DM-to-baryon ratio $\Omega_{\rm DM}/\Omega_{\rm baryon} \simeq 5$. Gauging the
$U(1)'$ group leads to twin atoms ($\Delta'$ - $\bar {\tau'}$ bound states)
that are successful ADM candidates in significant regions of parameter space,
sometimes with observable changes to DM halo properties. Direct detection
signatures satisfy current bounds, at times modified by dark form factors.
| [
{
"created": "Wed, 27 May 2015 17:32:01 GMT",
"version": "v1"
},
{
"created": "Wed, 16 Sep 2015 16:27:46 GMT",
"version": "v2"
}
] | 2015-09-17 | [
[
"García",
"Isabel García",
""
],
[
"Lasenby",
"Robert",
""
],
[
"March-Russell",
"John",
""
]
] | We study Asymmetric Dark Matter (ADM) in the context of the minimal (Fraternal) Twin Higgs solution to the little hierarchy problem, with a twin sector with gauged $SU(3)' \times SU(2)'$, a twin Higgs, and only third generation twin fermions. Naturalness requires the QCD$^\prime$ scale $\Lambda'_{\rm QCD} \simeq 0.5 - 20 \ {\rm GeV}$, and $t'$ to be heavy. We focus on the light $b'$ quark regime, $m_{b'} \lesssim \Lambda'_{\rm QCD}$, where QCD$^\prime$ is characterised by a single scale $\Lambda'_{\rm QCD}$ with no light pions. A twin baryon number asymmetry leads to a successful DM candidate: the spin-3/2 twin baryon, $\Delta' \sim b'b'b'$, with a dynamically determined mass ($\sim 5 \Lambda'_{\rm QCD}$) in the preferred range for the DM-to-baryon ratio $\Omega_{\rm DM}/\Omega_{\rm baryon} \simeq 5$. Gauging the $U(1)'$ group leads to twin atoms ($\Delta'$ - $\bar {\tau'}$ bound states) that are successful ADM candidates in significant regions of parameter space, sometimes with observable changes to DM halo properties. Direct detection signatures satisfy current bounds, at times modified by dark form factors. |
1407.7647 | Satoshi Mishima | Hsiang-nan Li, Satoshi Mishima | Glauber gluons in spectator amplitudes for $B \to \pi M$ decays | 22 pages, 14 figures. v2: minor corrections, version to appear in
Phys. Rev. D | Phys. Rev. D 90, 074018 (2014) | 10.1103/PhysRevD.90.074018 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We extract the Glauber divergences from the spectator amplitudes for two-body
hadronic decays $B \to M_1 M_2$ in the $k_T$ factorization theorem, where $M_2$
denotes the meson emitted at the weak vertex. Employing the eikonal
approximation, the divergences are factorized into the corresponding Glauber
phase factors associated with the $M_1$ and $M_2$ mesons. It is observed that
the latter factor enhances the spectator contribution to the color-suppressed
tree amplitude by modifying the interference pattern between the two involved
leading-order diagrams. The first factor rotates the enhanced spectator
contribution by a phase, and changes its interference with other tree diagrams.
The above Glauber effects are compared with the mechanism in elastic
rescattering among various $M_1 M_2$ final states, which has been widely
investigated in the literature. We postulate that only the Glauber effect
associated with a pion is significant, due to its special role as a $q \bar q$
bound state and as a pseudo Nambu-Goldstone boson simultaneously. Treating the
Glauber phases as additional inputs in the perturbative QCD (PQCD) approach, we
find a good fit to all the $B \to \pi\pi$, $\pi\rho$, $\pi\omega$, and $\pi K$
data, and resolve the long-standing $\pi\pi$ and $\pi K$ puzzles. The
nontrivial success of this modified PQCD formalism is elaborated.
| [
{
"created": "Tue, 29 Jul 2014 07:40:09 GMT",
"version": "v1"
},
{
"created": "Sat, 4 Oct 2014 02:07:00 GMT",
"version": "v2"
}
] | 2014-10-22 | [
[
"Li",
"Hsiang-nan",
""
],
[
"Mishima",
"Satoshi",
""
]
] | We extract the Glauber divergences from the spectator amplitudes for two-body hadronic decays $B \to M_1 M_2$ in the $k_T$ factorization theorem, where $M_2$ denotes the meson emitted at the weak vertex. Employing the eikonal approximation, the divergences are factorized into the corresponding Glauber phase factors associated with the $M_1$ and $M_2$ mesons. It is observed that the latter factor enhances the spectator contribution to the color-suppressed tree amplitude by modifying the interference pattern between the two involved leading-order diagrams. The first factor rotates the enhanced spectator contribution by a phase, and changes its interference with other tree diagrams. The above Glauber effects are compared with the mechanism in elastic rescattering among various $M_1 M_2$ final states, which has been widely investigated in the literature. We postulate that only the Glauber effect associated with a pion is significant, due to its special role as a $q \bar q$ bound state and as a pseudo Nambu-Goldstone boson simultaneously. Treating the Glauber phases as additional inputs in the perturbative QCD (PQCD) approach, we find a good fit to all the $B \to \pi\pi$, $\pi\rho$, $\pi\omega$, and $\pi K$ data, and resolve the long-standing $\pi\pi$ and $\pi K$ puzzles. The nontrivial success of this modified PQCD formalism is elaborated. |
1406.2095 | C. Q. Geng | Chao-Qiang Geng and Chong-Chung Lih | Semi-dileptonic decays of the light vector mesons in Light Front Quark
Model | 13 pages, 6 figures, References updated | Phys. Rev. C89, 065205 (2014) | 10.1103/PhysRevC.89.065205 | null | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the transition form factors of the light vector to pseudoscalar
mesons as functions of the momentum transfer $q^2$ within the light-front quark
model. With these form factors, we calculate the decay branching ratios of all
possible modes for $V\to P\ell^+\ell^-$ ($V=\omega$ and $\phi$, $P=\pi^0$,
$\eta$ and $\eta^{\prime}$ and $\ell=e$ and $\mu$). We find that our numerical
results fit with the data, such as those of $\omega \to \pi^0 \ell^+\ell^-$ and
$\phi\to \pi^0 e^+e^-$ by NA60 and $\phi \to\eta e^+e^-$ by SND. We also
predict that the branching ratios of $\phi \to \pi^0 \mu^+\mu^-$, $\omega\to
\eta e^+e^-$, $\omega\to \eta \mu^+\mu^-$, $\phi\to \eta \mu^+\mu^-$ and
$\phi\to \eta^{\prime} e^+e^-$ to be aroud $3.48\times 10^{-6}$, $3.22\times
10^{-6}$, $1.81\times 10^{-9}$, $6.86\times 10^{-6}$ $2.97\times 10^{-7}$,
respectively.
| [
{
"created": "Mon, 9 Jun 2014 07:19:47 GMT",
"version": "v1"
},
{
"created": "Wed, 18 Jun 2014 00:43:48 GMT",
"version": "v2"
}
] | 2014-06-20 | [
[
"Geng",
"Chao-Qiang",
""
],
[
"Lih",
"Chong-Chung",
""
]
] | We study the transition form factors of the light vector to pseudoscalar mesons as functions of the momentum transfer $q^2$ within the light-front quark model. With these form factors, we calculate the decay branching ratios of all possible modes for $V\to P\ell^+\ell^-$ ($V=\omega$ and $\phi$, $P=\pi^0$, $\eta$ and $\eta^{\prime}$ and $\ell=e$ and $\mu$). We find that our numerical results fit with the data, such as those of $\omega \to \pi^0 \ell^+\ell^-$ and $\phi\to \pi^0 e^+e^-$ by NA60 and $\phi \to\eta e^+e^-$ by SND. We also predict that the branching ratios of $\phi \to \pi^0 \mu^+\mu^-$, $\omega\to \eta e^+e^-$, $\omega\to \eta \mu^+\mu^-$, $\phi\to \eta \mu^+\mu^-$ and $\phi\to \eta^{\prime} e^+e^-$ to be aroud $3.48\times 10^{-6}$, $3.22\times 10^{-6}$, $1.81\times 10^{-9}$, $6.86\times 10^{-6}$ $2.97\times 10^{-7}$, respectively. |
hep-ph/0007257 | Graham Shaw | J. Forshaw, G.R. Kerley and G. Shaw (University of Manchester) | Colour Dipoles and Saturation | 3 pages, 2 figures. Talk given by G.S. at DIS 2000(Liverpool, April
2000) | Proc 8th Int. Workshop on Deep Inelastic Scattering, Eds.
J.A.Gracey and T.Greenshaw, World Scientific, 2001. | null | MC/TH 00/04 | hep-ph | null | We employ values of the colour dipole cross section extracted from
electroproduction and photoproduction data to show that gluon saturation
effects are not required by the current HERA data but will become important in
the THERA energy region.
| [
{
"created": "Mon, 24 Jul 2000 12:03:55 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Forshaw",
"J.",
"",
"University of Manchester"
],
[
"Kerley",
"G. R.",
"",
"University of Manchester"
],
[
"Shaw",
"G.",
"",
"University of Manchester"
]
] | We employ values of the colour dipole cross section extracted from electroproduction and photoproduction data to show that gluon saturation effects are not required by the current HERA data but will become important in the THERA energy region. |
1511.09415 | Guillaume Beuf | Tolga Altinoluk, N\'estor Armesto, Guillaume Beuf, Alex Kovner and
Michael Lublinsky | Heavy quarks in proton-nucleus collisions - the hybrid formalism | 34 pages, 3 figures | Phys. Rev. D 93, 054049 (2016) | 10.1103/PhysRevD.93.054049 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We explore the quark mass effects on inclusive hadron production in
proton-nucleus collisions at high energies. We consider two processes. First,
we compute the single inclusive cross-section for production of hadrons with
open heavy flavour in the proton forward direction at leading order. Next, in
the same kinematics, we calculate the heavy-quark contribution to single
inclusive production of light or unidentified hadrons at next-to-leading-order.
For both studies we exploit the hybrid formalism, that is the collinear
factorisation on the proton side while high-density and high-energy effects are
resummed on the side of the nucleus.
| [
{
"created": "Mon, 30 Nov 2015 18:17:52 GMT",
"version": "v1"
}
] | 2016-04-06 | [
[
"Altinoluk",
"Tolga",
""
],
[
"Armesto",
"Néstor",
""
],
[
"Beuf",
"Guillaume",
""
],
[
"Kovner",
"Alex",
""
],
[
"Lublinsky",
"Michael",
""
]
] | We explore the quark mass effects on inclusive hadron production in proton-nucleus collisions at high energies. We consider two processes. First, we compute the single inclusive cross-section for production of hadrons with open heavy flavour in the proton forward direction at leading order. Next, in the same kinematics, we calculate the heavy-quark contribution to single inclusive production of light or unidentified hadrons at next-to-leading-order. For both studies we exploit the hybrid formalism, that is the collinear factorisation on the proton side while high-density and high-energy effects are resummed on the side of the nucleus. |
hep-ph/9503204 | Ed Stoeffhaas | V. Barger, M.S. Berger, and R.J.N. Phillips | Quark Singlets: Implications and Constraints | Revtex version 3.0, 49 pages. 10 postscript figures included,
concatenated (not tarred) into one ps file, compressed and uuencoded.
Compressed postscript version of entire paper available soon at
http://phenom.physics.wisc.edu/pub/preprints/1995/madph-95-870.ps.Z or at
ftp://phenom.physics.wisc.edu/pub/preprints/1995/madph-95-870.ps.Z | Phys.Rev.D52:1663-1683,1995 | 10.1103/PhysRevD.52.1663 | MADPH-95-870 | hep-ph | null | Quarks whose left- and right-handed chiral components are both singlets with
respect to the SU(2) weak-isospin gauge group, offer interesting physics
possibilities beyond the Standard Model (SM) already studied in many contexts.
We here address some further aspects. We first collect and update the
constraints from present data on their masses and mixings with conventional
quarks. We discuss possible effects on $b\to s\gamma$ and $Z\to b\bar b$ decays
and give fresh illustrations of CP asymmetries in $B^0$ decays differing
dramatically from SM expectations. We analyse singlet effects in grand
unification scenarios: $d$-type singlets are most economically introduced in
${\bf 5+5^*}$ multiplets of $SU(5)$, with up to three generations, preserving
gauge coupling unification with perturbative values up to the GUT scale;
$u$-type singlets can arise in ${\bf 10+10^*}$ multiplets of $SU(5)$ with at
most one light generation. With extra matter multiplets the gauge couplings are
bigger; we give the two-loop evolution equations including exotic multiplets
and a possible extra $U(1)$ symmetry. Two-loop effects can become important,
threatening unification (modulo threshold effects), perturbativity and
asymptotic freedom of $\alpha_3$. In the Yukawa sector, top-quark fixed-point
behaviour is preserved and singlet-quark couplings have infrared fixed points
too, but unification of $b$ and $\tau$ couplings is not possible in a
three-generation $E_6$ model.
| [
{
"created": "Wed, 1 Mar 1995 21:45:58 GMT",
"version": "v1"
}
] | 2016-09-01 | [
[
"Barger",
"V.",
""
],
[
"Berger",
"M. S.",
""
],
[
"Phillips",
"R. J. N.",
""
]
] | Quarks whose left- and right-handed chiral components are both singlets with respect to the SU(2) weak-isospin gauge group, offer interesting physics possibilities beyond the Standard Model (SM) already studied in many contexts. We here address some further aspects. We first collect and update the constraints from present data on their masses and mixings with conventional quarks. We discuss possible effects on $b\to s\gamma$ and $Z\to b\bar b$ decays and give fresh illustrations of CP asymmetries in $B^0$ decays differing dramatically from SM expectations. We analyse singlet effects in grand unification scenarios: $d$-type singlets are most economically introduced in ${\bf 5+5^*}$ multiplets of $SU(5)$, with up to three generations, preserving gauge coupling unification with perturbative values up to the GUT scale; $u$-type singlets can arise in ${\bf 10+10^*}$ multiplets of $SU(5)$ with at most one light generation. With extra matter multiplets the gauge couplings are bigger; we give the two-loop evolution equations including exotic multiplets and a possible extra $U(1)$ symmetry. Two-loop effects can become important, threatening unification (modulo threshold effects), perturbativity and asymptotic freedom of $\alpha_3$. In the Yukawa sector, top-quark fixed-point behaviour is preserved and singlet-quark couplings have infrared fixed points too, but unification of $b$ and $\tau$ couplings is not possible in a three-generation $E_6$ model. |
1411.3310 | Christopher Verhaaren | Gustavo Burdman, Zackaria Chacko, Roni Harnik, Leonardo de Lima and
Christopher B. Verhaaren | Colorless Top Partners, a 125 GeV Higgs, and the Limits on Naturalness | 28 pages plus appendices and references | Phys. Rev. D 91, 055007 (2015) | 10.1103/PhysRevD.91.055007 | FERMILAB-PUB-14-411-T | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Theories of physics beyond the Standard Model that address the hierarchy
problem generally involve top partners, new particles that cancel the quadratic
divergences associated with the Yukawa coupling of the Higgs to the top quark.
With extensions of the Standard Model that involve new colored particles coming
under strain from collider searches, scenarios in which the top partners carry
no charge under the strong interactions have become increasingly compelling.
Although elusive for direct searches, these theories predict modified couplings
of the Higgs boson to the Standard Model particles. This results in corrections
to the Higgs production and decay rates that can be detected at the Large
Hadron Collider (LHC) provided the top partners are sufficiently light, and the
theory correspondingly natural. In this paper we consider three theories that
address the little hierarchy problem and involve colorless top partners,
specifically the Mirror Twin Higgs, Folded Supersymmetry, and the Quirky Little
Higgs. For each model we investigate the current and future bounds on the top
partners, and the corresponding limits on naturalness, that can be obtained
from the Higgs program at the LHC. We conclude that the LHC will not be able to
strongly disfavor naturalness, with mild tuning at the level of about one part
in ten remaining allowed even with 3000 fb$^{-1}$ of data at 14 TeV.
| [
{
"created": "Wed, 12 Nov 2014 20:30:31 GMT",
"version": "v1"
},
{
"created": "Tue, 3 Mar 2015 21:04:11 GMT",
"version": "v2"
}
] | 2015-03-11 | [
[
"Burdman",
"Gustavo",
""
],
[
"Chacko",
"Zackaria",
""
],
[
"Harnik",
"Roni",
""
],
[
"de Lima",
"Leonardo",
""
],
[
"Verhaaren",
"Christopher B.",
""
]
] | Theories of physics beyond the Standard Model that address the hierarchy problem generally involve top partners, new particles that cancel the quadratic divergences associated with the Yukawa coupling of the Higgs to the top quark. With extensions of the Standard Model that involve new colored particles coming under strain from collider searches, scenarios in which the top partners carry no charge under the strong interactions have become increasingly compelling. Although elusive for direct searches, these theories predict modified couplings of the Higgs boson to the Standard Model particles. This results in corrections to the Higgs production and decay rates that can be detected at the Large Hadron Collider (LHC) provided the top partners are sufficiently light, and the theory correspondingly natural. In this paper we consider three theories that address the little hierarchy problem and involve colorless top partners, specifically the Mirror Twin Higgs, Folded Supersymmetry, and the Quirky Little Higgs. For each model we investigate the current and future bounds on the top partners, and the corresponding limits on naturalness, that can be obtained from the Higgs program at the LHC. We conclude that the LHC will not be able to strongly disfavor naturalness, with mild tuning at the level of about one part in ten remaining allowed even with 3000 fb$^{-1}$ of data at 14 TeV. |
1203.0581 | Neelima Kelkar Dr | N. G. Kelkar, F. Garcia Daza, M. Nowakowski | Determining the size of the proton | 20 pages LaTex | Nuclear Physics B 864 (2012) 382 | 10.1016/j.nuclphysb.2012.06.015 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A measurement of the Lamb shift of 49,881.88(76) GHz in muonic hydrogen in
conjunction with theoretical estimates of the proton structure effects was
recently used to deduce an accurate but rather small radius of the proton. Such
an important shift in the understanding of fundamental values needs
reconfirmation. Using a different approach with electromagnetic form factors of
the proton, we obtain a new expression for the transition energy, $\Delta =
E_{2P_{{3}/{2}}}^{f=2} - E_{2S_{{1}/{2}}}^{f=1}$, in muonic hydrogen and deduce
a proton radius, $r_p = 0.831$ fm.
| [
{
"created": "Fri, 2 Mar 2012 22:13:12 GMT",
"version": "v1"
},
{
"created": "Thu, 2 Aug 2012 22:59:06 GMT",
"version": "v2"
}
] | 2015-06-04 | [
[
"Kelkar",
"N. G.",
""
],
[
"Daza",
"F. Garcia",
""
],
[
"Nowakowski",
"M.",
""
]
] | A measurement of the Lamb shift of 49,881.88(76) GHz in muonic hydrogen in conjunction with theoretical estimates of the proton structure effects was recently used to deduce an accurate but rather small radius of the proton. Such an important shift in the understanding of fundamental values needs reconfirmation. Using a different approach with electromagnetic form factors of the proton, we obtain a new expression for the transition energy, $\Delta = E_{2P_{{3}/{2}}}^{f=2} - E_{2S_{{1}/{2}}}^{f=1}$, in muonic hydrogen and deduce a proton radius, $r_p = 0.831$ fm. |
1310.8034 | Mikhail Zubkov Dr | M.A.Zubkov | Dynamical torsion as the microscopic origin of the neutrino seesaw | Accepted for publication in Mod.Phys.Lett.A | Mod. Phys. Lett. A, Vol. 29, No. 21 1450111 (2014) | 10.1142/S0217732314501119 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | It is assumed, that there are two scales in quantum gravity. Metric
fluctuates at the scales of the order of the Plank mass. The second scale $M_T$
is related to the fluctuations of torsion. We suppose, that it may be as low as
$M_T \sim 1$ TeV. Due to the non - minimal coupling to torsion the attractive
interaction between the fermions appears. The non - minimal coupling admits the
appearance of different coupling constants for different fermions. This opens
the possibility that the interaction with torsion gives the Majorana masses for
the right - handed neutrinos (that are assumed to be of the order of $M_T$). We
suppose, that the Dirac masses for the neutrino are all close to the mass of
electron. This gives the light neutrino masses $\le 0.25$ eV. In addition, the
model predicts the appearance of Majorons that may contribute to the dark
matter as well as to the invisible decay of the $125$ GeV Higgs boson.
| [
{
"created": "Wed, 30 Oct 2013 06:12:16 GMT",
"version": "v1"
},
{
"created": "Mon, 13 Jan 2014 15:42:02 GMT",
"version": "v2"
},
{
"created": "Fri, 28 Mar 2014 08:02:44 GMT",
"version": "v3"
},
{
"created": "Sun, 18 May 2014 02:31:28 GMT",
"version": "v4"
}
] | 2014-07-01 | [
[
"Zubkov",
"M. A.",
""
]
] | It is assumed, that there are two scales in quantum gravity. Metric fluctuates at the scales of the order of the Plank mass. The second scale $M_T$ is related to the fluctuations of torsion. We suppose, that it may be as low as $M_T \sim 1$ TeV. Due to the non - minimal coupling to torsion the attractive interaction between the fermions appears. The non - minimal coupling admits the appearance of different coupling constants for different fermions. This opens the possibility that the interaction with torsion gives the Majorana masses for the right - handed neutrinos (that are assumed to be of the order of $M_T$). We suppose, that the Dirac masses for the neutrino are all close to the mass of electron. This gives the light neutrino masses $\le 0.25$ eV. In addition, the model predicts the appearance of Majorons that may contribute to the dark matter as well as to the invisible decay of the $125$ GeV Higgs boson. |
hep-ph/9701336 | Sabine Kraml | A. Bartl, H. Eberl, S. Kraml, W. Majerotto, W. Porod, and A. Sopczak | Search of Stop, Sbottom, $\tau$-Sneutrino, and Stau at an $e^+e^-$
Linear Collider with $\sqrt{s}=0.5 - 2$ TeV | 35 pages, LaTeX, 26 figures, two references added | Z.Phys.C76:549-560,1997 | 10.1007/s002880050577 | UWThPh-1996-66, HEPHY-PUB 663/97, DESY 97-003 | hep-ph | null | We discuss pair production and decays of stops, sbottoms, $\tau$-sneutrinos,
and staus in $e^+e^-$ annihilation in the energy range $\sqrt{s} = 500 GeV$ to
2 TeV. Numerical predictions within the Minimal Supersymmetric Standard Model
(MSSM) for cross sections and decay rates are presented. We study the stop
discovery potential for $\sqrt{s} = 500 GeV$ and $10 \fb^{-1}$ integrated
luminosity for polarized e^- beams. Moreover, we give an estimate of the error
of the soft-breaking stop and sbottom parameters that can be obtained by cross
section measurements with polarized e^- beams.
| [
{
"created": "Tue, 21 Jan 1997 12:00:42 GMT",
"version": "v1"
},
{
"created": "Sat, 1 Feb 1997 11:47:46 GMT",
"version": "v2"
},
{
"created": "Mon, 3 Feb 1997 11:31:17 GMT",
"version": "v3"
}
] | 2011-01-27 | [
[
"Bartl",
"A.",
""
],
[
"Eberl",
"H.",
""
],
[
"Kraml",
"S.",
""
],
[
"Majerotto",
"W.",
""
],
[
"Porod",
"W.",
""
],
[
"Sopczak",
"A.",
""
]
] | We discuss pair production and decays of stops, sbottoms, $\tau$-sneutrinos, and staus in $e^+e^-$ annihilation in the energy range $\sqrt{s} = 500 GeV$ to 2 TeV. Numerical predictions within the Minimal Supersymmetric Standard Model (MSSM) for cross sections and decay rates are presented. We study the stop discovery potential for $\sqrt{s} = 500 GeV$ and $10 \fb^{-1}$ integrated luminosity for polarized e^- beams. Moreover, we give an estimate of the error of the soft-breaking stop and sbottom parameters that can be obtained by cross section measurements with polarized e^- beams. |
hep-ph/0205337 | Fernando Lombardo | R.J. Rivers, F.C. Lombardo, and F.D. Mazzitelli | The Formation of Classical Defects After a Slow Quantum Phase Transition | 10 pages, RevTex file. No figures. To appear in Phys. Lett. B | Phys.Lett. B539 (2002) 1-7 | 10.1016/S0370-2693(02)02044-0 | null | hep-ph cond-mat hep-th | null | Classical defects (monopoles, vortices, etc.) are a characteristic
consequence of many phase transitions of quantum fields. We show a model in
which the onset of classical probability distributions, for the long-wavelength
modes at early times, allows the identification of line-zeroes of the field
with vortex separation. We obtain a refined version of Kibble's causal results
for defect separation, but from a completely different approach. It is apparent
that vortices are not created from thermal fluctuations in the Ginzburg regime.
| [
{
"created": "Thu, 30 May 2002 13:46:05 GMT",
"version": "v1"
}
] | 2015-06-25 | [
[
"Rivers",
"R. J.",
""
],
[
"Lombardo",
"F. C.",
""
],
[
"Mazzitelli",
"F. D.",
""
]
] | Classical defects (monopoles, vortices, etc.) are a characteristic consequence of many phase transitions of quantum fields. We show a model in which the onset of classical probability distributions, for the long-wavelength modes at early times, allows the identification of line-zeroes of the field with vortex separation. We obtain a refined version of Kibble's causal results for defect separation, but from a completely different approach. It is apparent that vortices are not created from thermal fluctuations in the Ginzburg regime. |
1705.09631 | Valery Lyubovitskij | Yubing Dong, Amand Faessler, Thomas Gutsche, Qifang L\"u, Valery E.
Lyubovitskij | Selected strong decays of $\eta(2225)$ and $\phi(2170)$ as $\Lambda
\bar\Lambda$ bound states | 9 pages | Phys. Rev. D 96, 074027 (2017) | 10.1103/PhysRevD.96.074027 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The strong decays of the two resonances $\eta(2225)$ and $\phi(2170)$ are
discussed for selected decay channels. The two resonances are considered as the
$\Lambda \bar{\Lambda}$ bound states in the molecular scenario. The
phenomenological hadronic molecular approach is employed for the calculation of
respective decay modes using effective Lagrangians. Our results show that the
decay modes $\eta(2225)\to K^*K$ and $\phi(2175) \to KK$ dominate over the
partial decay widths of $\eta(2275)\to VV (\phi\phi, \omega\omega, K^*K^*)$ and
$\phi(2175)\to VS (\omega\sigma, K^*K^*_0(800), \phi f_0(980))$ due to phase
space and couplings.
| [
{
"created": "Fri, 26 May 2017 16:03:14 GMT",
"version": "v1"
},
{
"created": "Mon, 29 May 2017 12:26:01 GMT",
"version": "v2"
},
{
"created": "Thu, 26 Oct 2017 17:02:55 GMT",
"version": "v3"
}
] | 2017-10-27 | [
[
"Dong",
"Yubing",
""
],
[
"Faessler",
"Amand",
""
],
[
"Gutsche",
"Thomas",
""
],
[
"Lü",
"Qifang",
""
],
[
"Lyubovitskij",
"Valery E.",
""
]
] | The strong decays of the two resonances $\eta(2225)$ and $\phi(2170)$ are discussed for selected decay channels. The two resonances are considered as the $\Lambda \bar{\Lambda}$ bound states in the molecular scenario. The phenomenological hadronic molecular approach is employed for the calculation of respective decay modes using effective Lagrangians. Our results show that the decay modes $\eta(2225)\to K^*K$ and $\phi(2175) \to KK$ dominate over the partial decay widths of $\eta(2275)\to VV (\phi\phi, \omega\omega, K^*K^*)$ and $\phi(2175)\to VS (\omega\sigma, K^*K^*_0(800), \phi f_0(980))$ due to phase space and couplings. |
hep-ph/0312188 | Bennie F. L. Ward | B.F.L. Ward (1 and 2) ((1) Department of Physics and Astronomy,
University of Tennessee, Knoxville, TN, USA, (2) Department of Physics,
Baylor University, Waco, TX, USA) | Massive Elementary Particles and Black Holes | 11 pages; 1 figure; improved text relating to asymptotic safety | JCAP 0402 (2004) 011 | 10.1088/1475-7516/2004/02/011 | UTHEP-03-1101;BU-HEPP-03/11 | hep-ph | null | An outstanding problem posed by Einstein's general theory of relativity to
the quantum theory of point particle fields is the fate of a massive point
particle; for, in the classical solutions of Einstein's theory, such a system
should be a black hole. We use exact results in a new approach to quantum
gravity to show that this conclusion is obviated by quantum loop effects.
Phenomenological implications are discussed
| [
{
"created": "Mon, 15 Dec 2003 17:50:16 GMT",
"version": "v1"
},
{
"created": "Wed, 4 Feb 2004 21:10:50 GMT",
"version": "v2"
}
] | 2009-11-10 | [
[
"Ward",
"B. F. L.",
"",
"1 and 2"
]
] | An outstanding problem posed by Einstein's general theory of relativity to the quantum theory of point particle fields is the fate of a massive point particle; for, in the classical solutions of Einstein's theory, such a system should be a black hole. We use exact results in a new approach to quantum gravity to show that this conclusion is obviated by quantum loop effects. Phenomenological implications are discussed |
1803.08052 | Andrzej Buras | Andrzej Buras and Jean-Marc Gerard | $K\to\pi\pi$ and $K-\pi$ Matrix Elements of the Chromomagnetic Operators
from Dual QCD | 14 pages, no figures, clarifications in Section 5.3 added,
conclusions unchanged | null | 10.1007/JHEP07(2018)126 | null | hep-ph hep-ex hep-lat | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We perform for the first time a direct calculation of on-shell $K\to\pi\pi$
hadronic matrix elements of chromomagnetic operators (CMO) in the Standard
Model and beyond. To his end, we use the successful Dual QCD (DQCD) approach in
which we also consider off-shell $K-\pi$ matrix elements that allows the
comparison with lattice QCD calculations of these matrix elements presented
recently by the ETM collaboration. Working in the SU(3) chiral limit, we find
for the single $B$ parameter $B_{\rm CMO}=0.33$. Using the numerical results
provided by the ETM collaboration we argue that only small corrections beyond
that limit are to be expected. Our results are relevant for new physics
scenarios in the context of the emerging $\epsilon^\prime/\epsilon$ anomaly
strongly indicated within DQCD and supported by RBC-UKQCD lattice
collaboration.
| [
{
"created": "Wed, 21 Mar 2018 18:00:02 GMT",
"version": "v1"
},
{
"created": "Tue, 1 May 2018 18:40:04 GMT",
"version": "v2"
},
{
"created": "Thu, 14 Jun 2018 10:31:22 GMT",
"version": "v3"
}
] | 2018-08-15 | [
[
"Buras",
"Andrzej",
""
],
[
"Gerard",
"Jean-Marc",
""
]
] | We perform for the first time a direct calculation of on-shell $K\to\pi\pi$ hadronic matrix elements of chromomagnetic operators (CMO) in the Standard Model and beyond. To his end, we use the successful Dual QCD (DQCD) approach in which we also consider off-shell $K-\pi$ matrix elements that allows the comparison with lattice QCD calculations of these matrix elements presented recently by the ETM collaboration. Working in the SU(3) chiral limit, we find for the single $B$ parameter $B_{\rm CMO}=0.33$. Using the numerical results provided by the ETM collaboration we argue that only small corrections beyond that limit are to be expected. Our results are relevant for new physics scenarios in the context of the emerging $\epsilon^\prime/\epsilon$ anomaly strongly indicated within DQCD and supported by RBC-UKQCD lattice collaboration. |
hep-ph/0702232 | Pedro Fernando Simoes Costa | Pedro Costa | Behavior of physical observables in the vicinity of the QCD critical end
point | Talk given at Quark Confinement and the Hadron Spectrum VII, Ponta
Delgada, Azores, Portugal, 2-7 Sep 2006 | AIP Conf.Proc.892:255-257,2007 | 10.1063/1.2714387 | null | hep-ph | null | Using the SU(3) Nambu-Jona-Lasinio (NJL) model, we study the chiral phase
transition at finite $T$ and $\mu_B$. Special attention is given to the QCD
critical end point (CEP): the study of physical quantities, as the pressure,
the entropy, the baryon number susceptibility and the specific heat near the
CEP, will provide complementary information concerning the order of the phase
transition. We also analyze the information provided by the study of the
critical exponents around the CEP.
| [
{
"created": "Thu, 22 Feb 2007 13:59:51 GMT",
"version": "v1"
}
] | 2010-11-11 | [
[
"Costa",
"Pedro",
""
]
] | Using the SU(3) Nambu-Jona-Lasinio (NJL) model, we study the chiral phase transition at finite $T$ and $\mu_B$. Special attention is given to the QCD critical end point (CEP): the study of physical quantities, as the pressure, the entropy, the baryon number susceptibility and the specific heat near the CEP, will provide complementary information concerning the order of the phase transition. We also analyze the information provided by the study of the critical exponents around the CEP. |
1311.0736 | Hamza Berrehrah | H. Berrehrah, E. Bratkovskaya, W. Cassing, P.B. Gossiaux and J.
Aichelin | Towards the dynamical study of heavy-flavor quarks in the
Quark-Gluon-Plasma | 4 pages, 5 figures, International Conference on Strangeness in Quark
Matter 2013 (SQM 2013) | null | 10.1088/1742-6596/509/1/012076 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Within the aim of a dynamical study of on- and off-shell heavy quarks Q in
the quark gluon plasma (QGP) - as produced in relativistic nucleus-nucleus
collisions - we study the heavy quark collisional scattering on partons of the
QGP. The elastic cross sections $\sigma_{q,g-Q}$ are evaluated for perturbative
partons (massless on-shell particles) and for dynamical quasi-particles
(massive off-shell particles as described by the dynamical quasi-particles
model "DQPM") using the leading order Born diagrams. We demonstrate that the
finite width of the quasi-particles in the DQPM has little influence on the
cross sections $\sigma_{q,g-Q}$ except close to thresholds. We, furthermore,
calculate the heavy quark relaxation time as a function of temperature T within
the different approaches using these cross sections.
| [
{
"created": "Mon, 4 Nov 2013 15:42:56 GMT",
"version": "v1"
},
{
"created": "Fri, 1 Aug 2014 14:12:59 GMT",
"version": "v2"
}
] | 2014-08-04 | [
[
"Berrehrah",
"H.",
""
],
[
"Bratkovskaya",
"E.",
""
],
[
"Cassing",
"W.",
""
],
[
"Gossiaux",
"P. B.",
""
],
[
"Aichelin",
"J.",
""
]
] | Within the aim of a dynamical study of on- and off-shell heavy quarks Q in the quark gluon plasma (QGP) - as produced in relativistic nucleus-nucleus collisions - we study the heavy quark collisional scattering on partons of the QGP. The elastic cross sections $\sigma_{q,g-Q}$ are evaluated for perturbative partons (massless on-shell particles) and for dynamical quasi-particles (massive off-shell particles as described by the dynamical quasi-particles model "DQPM") using the leading order Born diagrams. We demonstrate that the finite width of the quasi-particles in the DQPM has little influence on the cross sections $\sigma_{q,g-Q}$ except close to thresholds. We, furthermore, calculate the heavy quark relaxation time as a function of temperature T within the different approaches using these cross sections. |
2010.05915 | Ennio Salvioni | Giovanni Banelli, Ennio Salvioni, Javi Serra, Tobias Theil, Andreas
Weiler | The Present and Future of Four Top Operators | 27 pages + references, 11 figures, 5 tables. v2: slight modification
of title, minor additions to discussion (including HL-LHC projection),
references added, results unchanged; version published in JHEP | JHEP 02 (2021) 043 | 10.1007/JHEP02(2021)043 | TUM-HEP-1286-20, CERN-TH-2020-166 | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the phenomenology of a strongly-interacting top quark at future
hadron and lepton colliders, showing that the characteristic four-top contact
operators give rise to the most significant effects. We demonstrate the
extraordinary potential of a 100 TeV proton-proton collider to directly test
such non-standard interactions in four-top production, a process that we
thoroughly analyze in the same-sign dilepton and trilepton channels, and
explore in the fully hadronic channel. Furthermore, high-energy
electron-positron colliders, such as CLIC or the ILC, are shown to exhibit an
indirect yet remarkable sensitivity to four-top operators, since these
constitute, via renormalization group evolution, the leading new-physics
deformations in top-quark pair production. We investigate the impact of our
results on the parameter space of composite Higgs models with a
strongly-coupled (right-handed) top quark, finding that four-top probes provide
the best sensitivity on the compositeness scale at the future energy frontier.
In addition, we investigate mild yet persisting LHC excesses in multilepton
plus jets final states, showing that they can be consistently described in the
effective field theory of such a new-physics scenario.
| [
{
"created": "Mon, 12 Oct 2020 18:00:01 GMT",
"version": "v1"
},
{
"created": "Sat, 13 Feb 2021 10:14:54 GMT",
"version": "v2"
}
] | 2021-02-16 | [
[
"Banelli",
"Giovanni",
""
],
[
"Salvioni",
"Ennio",
""
],
[
"Serra",
"Javi",
""
],
[
"Theil",
"Tobias",
""
],
[
"Weiler",
"Andreas",
""
]
] | We study the phenomenology of a strongly-interacting top quark at future hadron and lepton colliders, showing that the characteristic four-top contact operators give rise to the most significant effects. We demonstrate the extraordinary potential of a 100 TeV proton-proton collider to directly test such non-standard interactions in four-top production, a process that we thoroughly analyze in the same-sign dilepton and trilepton channels, and explore in the fully hadronic channel. Furthermore, high-energy electron-positron colliders, such as CLIC or the ILC, are shown to exhibit an indirect yet remarkable sensitivity to four-top operators, since these constitute, via renormalization group evolution, the leading new-physics deformations in top-quark pair production. We investigate the impact of our results on the parameter space of composite Higgs models with a strongly-coupled (right-handed) top quark, finding that four-top probes provide the best sensitivity on the compositeness scale at the future energy frontier. In addition, we investigate mild yet persisting LHC excesses in multilepton plus jets final states, showing that they can be consistently described in the effective field theory of such a new-physics scenario. |
1505.04712 | Hajime Otsuka | Hajime Otsuka | Particle physics and cosmology with high-scale SUSY breaking in
five-dimensional supergravity models | 19 pages, 1 figure, typos corrected and references added | null | 10.1007/JHEP10(2015)008 | WU-HEP-15-11 | hep-ph astro-ph.CO hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We discuss a high-scale SUSY breaking scenario with the wino dark matter in
the five-dimensional supergravity model on $S^1/Z_2$. The extra U(1) symmetries
broken by the orbifold projection control the flavor structure of soft
SUSY-breaking parameters as well as the Yukawa couplings, and a scalar
component of the one of moduli multiplets, which arise from extra-dimensional
components of the U(1) vector multiplets, induces the slow-roll inflation.
Because of the supersymmetric moduli stabilization as well as the moduli
inflation, it is found that the correct dark matter relic abundance is
non-thermally generated by the gravitino decaying into the wino.
| [
{
"created": "Mon, 18 May 2015 16:38:13 GMT",
"version": "v1"
},
{
"created": "Wed, 7 Oct 2015 17:46:17 GMT",
"version": "v2"
}
] | 2015-10-08 | [
[
"Otsuka",
"Hajime",
""
]
] | We discuss a high-scale SUSY breaking scenario with the wino dark matter in the five-dimensional supergravity model on $S^1/Z_2$. The extra U(1) symmetries broken by the orbifold projection control the flavor structure of soft SUSY-breaking parameters as well as the Yukawa couplings, and a scalar component of the one of moduli multiplets, which arise from extra-dimensional components of the U(1) vector multiplets, induces the slow-roll inflation. Because of the supersymmetric moduli stabilization as well as the moduli inflation, it is found that the correct dark matter relic abundance is non-thermally generated by the gravitino decaying into the wino. |
0705.0162 | M. E. Carrington | M.E. Carrington and E. Kovalchuk | QED Electrical Conductivity using the 2PI Effective Action | 24 pages, 21 figures | Phys.Rev.D76:045019,2007 | 10.1103/PhysRevD.76.045019 | null | hep-ph | null | In this article we calculate the electrical conductivity in QED using the 2PI
effective action. We use a modified version of the usual 2PI effective action
which is defined with respect to self-consistent solutions of the 2-point
functions. We show that the green functions obtained from this modified
effective action satisfy ward identities and that the conductivity obtained
from the kubo relation is gauge invariant. We work to 3-loop order in the
modified 2PI effective action and show explicitly that the resulting expression
for the conductivity contains the square of the amplitude that corresponds to
all binary collision and production processes.
| [
{
"created": "Tue, 1 May 2007 20:48:05 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Carrington",
"M. E.",
""
],
[
"Kovalchuk",
"E.",
""
]
] | In this article we calculate the electrical conductivity in QED using the 2PI effective action. We use a modified version of the usual 2PI effective action which is defined with respect to self-consistent solutions of the 2-point functions. We show that the green functions obtained from this modified effective action satisfy ward identities and that the conductivity obtained from the kubo relation is gauge invariant. We work to 3-loop order in the modified 2PI effective action and show explicitly that the resulting expression for the conductivity contains the square of the amplitude that corresponds to all binary collision and production processes. |
0810.3517 | Michele Maltoni | Michele Maltoni | New interactions: past and future experiments | LaTeX file using jpconf class, 8 pages, 2 tables. Proceedings of the
"XXIII International Conference on Neutrino Physics and Astrophysics"
(Neutrino 08), Christchurch, New Zealand, May 25-31, 2008 | J.Phys.Conf.Ser.136:022024,2008 | 10.1088/1742-6596/136/2/022024 | IFT-UAM/CSIC-08-67 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this talk I will review the present status and future perspectives of some
popular extensions of the conventional three-neutrino oscillation scenario,
from a purely phenomenological point of view. For concreteness I will focus
only on three specific scenarios: non-standard neutrino interactions with
matters, models with extra sterile neutrinos, and neutrino decay and
decoherence.
| [
{
"created": "Mon, 20 Oct 2008 10:29:28 GMT",
"version": "v1"
}
] | 2008-12-18 | [
[
"Maltoni",
"Michele",
""
]
] | In this talk I will review the present status and future perspectives of some popular extensions of the conventional three-neutrino oscillation scenario, from a purely phenomenological point of view. For concreteness I will focus only on three specific scenarios: non-standard neutrino interactions with matters, models with extra sterile neutrinos, and neutrino decay and decoherence. |
hep-ph/9210248 | Tae-Sun Park | Tae-Sun Park, Dong-Pil Min and Mannque Rho | Nuclear Axial-Charge Transitions in Chiral Perturbation Theory | 11 pages, LaTeX file, SNUTP 92-82 | null | null | null | hep-ph | null | We develop a systematic chiral perturbation expansion for the calculation of
meson-exchange currents in nuclei and apply the formalism to nuclear axial
currents. We summarize the principal results of such a calculation to one loop
order on nuclear axial-charge transitions which provides a strong support to
the conjecture of ``chiral filter phenomenon" in nuclear medium. The use of
heavy baryon chiral perturbation theory enables us to obtain a remarkably
simple result valid next to the leading order in chiral counting. The dominant
role of a soft-pion exchange in axial-charge transitions in heavy nuclei is
confirmed. An important, {\it albeit} indirect, consequence of our result on
the empirically observed enhancement in axial-charge transitions in heavy
nuclei is pointed out.
| [
{
"created": "Tue, 20 Oct 1992 06:02:49 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Park",
"Tae-Sun",
""
],
[
"Min",
"Dong-Pil",
""
],
[
"Rho",
"Mannque",
""
]
] | We develop a systematic chiral perturbation expansion for the calculation of meson-exchange currents in nuclei and apply the formalism to nuclear axial currents. We summarize the principal results of such a calculation to one loop order on nuclear axial-charge transitions which provides a strong support to the conjecture of ``chiral filter phenomenon" in nuclear medium. The use of heavy baryon chiral perturbation theory enables us to obtain a remarkably simple result valid next to the leading order in chiral counting. The dominant role of a soft-pion exchange in axial-charge transitions in heavy nuclei is confirmed. An important, {\it albeit} indirect, consequence of our result on the empirically observed enhancement in axial-charge transitions in heavy nuclei is pointed out. |
hep-ph/0503259 | Michel Fontannaz | P. Aurenche, M. Fontannaz, J. Ph. Guillet | New NLO Parametrizations of the Parton Distributions in Real Photons | 38 pages, 23 Postscript figures, fig. 6,7,8,9 improved, comparisons
with other NLO parametrizations, added references | Eur.Phys.J.C44:395-409,2005 | 10.1140/epjc/s2005-02355-1 | LAPTH-1091/5, LPT-Orsay 04-53 | hep-ph | null | We present new NLO sets of parton distributions in real photons based on a
scheme invariant definition of the non-perturbative input. We compare the
theoretical predictions with LEP data and a best fit allows us to constrain the
parameters of the distributions. The shape of the gluon distribution is poorly
constrained and we consider the possibility to measure it in photoproduction
experiments. Three parametrizations which aim to take into account the
scattering of LEP data are proposed. They are compared to other NLO
parametrizations.
| [
{
"created": "Fri, 25 Mar 2005 09:12:40 GMT",
"version": "v1"
},
{
"created": "Tue, 2 Aug 2005 15:41:39 GMT",
"version": "v2"
}
] | 2009-01-07 | [
[
"Aurenche",
"P.",
""
],
[
"Fontannaz",
"M.",
""
],
[
"Guillet",
"J. Ph.",
""
]
] | We present new NLO sets of parton distributions in real photons based on a scheme invariant definition of the non-perturbative input. We compare the theoretical predictions with LEP data and a best fit allows us to constrain the parameters of the distributions. The shape of the gluon distribution is poorly constrained and we consider the possibility to measure it in photoproduction experiments. Three parametrizations which aim to take into account the scattering of LEP data are proposed. They are compared to other NLO parametrizations. |
hep-ph/0510276 | Edward Stoeffhaas | Francis Halzen | Lepton Photon Symposium 2005: Summary and Outlook | Talk presented at the XXII International Symposium on Lepton-Photon
Interactions at High Energy, Uppsala, Sweden, July 2005. 11 pages, Latex2e
with ws-procs10x7.cls (included), 6 postscript figures (color). Typos
corrected | Int.J.Mod.Phys. A21 (2006) 2000-2010 | 10.1142/S0217751X06032939 | MADPH-05-1444 | hep-ph astro-ph hep-ex hep-th | null | Lepton Photon 2005 told the saga of the Standard Model which is still
exhilarating because it leaves all questions of consequence unanswered.
| [
{
"created": "Thu, 20 Oct 2005 20:01:11 GMT",
"version": "v1"
},
{
"created": "Wed, 2 Nov 2005 22:31:00 GMT",
"version": "v2"
}
] | 2009-11-11 | [
[
"Halzen",
"Francis",
""
]
] | Lepton Photon 2005 told the saga of the Standard Model which is still exhilarating because it leaves all questions of consequence unanswered. |
1812.08795 | Djuna Croon | Joshua Berger, Djuna Croon, Sonia El Hedri, Karsten Jedamzik, Ashley
Perko, Devin G. E. Walker | Dark matter amnesia in out-of-equilibrium scenarios | 16 pages, 2 figures | null | 10.1088/1475-7516/2019/02/051 | PITT-PACC-1822 | hep-ph astro-ph.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Models in which the dark matter is produced at extremely low rates from the
annihilation of Standard Model particles in the early Universe allow us to
explain the current dark matter relic density while easily evading the
traditional experimental constraints. In scenarios where the dark matter
interacts with the Standard Model via a new physics mediator, the early
Universe dynamics of the dark sector can be particularly complex, as the dark
matter and the mediator could be in thermal and chemical equilibrium with each
other. This equilibration takes place via number-changing processes such as
double Compton scattering and bremsstrahlung, whose amplitudes are cumbersome
to calculate. In this paper, we show that in large regions of the parameter
space, these equilibration mechanisms do not significantly affect the final
dark matter relic density. In particular, for a model with a light dark photon
mediator, the relic density can be reasonably estimated by considering that the
dark matter is solely produced through the annihilation of Standard Model
particles. This result considerably simplifies the treatment of a large class
of dark matter theories, facilitating in particular the superimposition of the
relic density constraints on the current and future experimental bounds.
| [
{
"created": "Thu, 20 Dec 2018 19:00:01 GMT",
"version": "v1"
}
] | 2019-03-06 | [
[
"Berger",
"Joshua",
""
],
[
"Croon",
"Djuna",
""
],
[
"Hedri",
"Sonia El",
""
],
[
"Jedamzik",
"Karsten",
""
],
[
"Perko",
"Ashley",
""
],
[
"Walker",
"Devin G. E.",
""
]
] | Models in which the dark matter is produced at extremely low rates from the annihilation of Standard Model particles in the early Universe allow us to explain the current dark matter relic density while easily evading the traditional experimental constraints. In scenarios where the dark matter interacts with the Standard Model via a new physics mediator, the early Universe dynamics of the dark sector can be particularly complex, as the dark matter and the mediator could be in thermal and chemical equilibrium with each other. This equilibration takes place via number-changing processes such as double Compton scattering and bremsstrahlung, whose amplitudes are cumbersome to calculate. In this paper, we show that in large regions of the parameter space, these equilibration mechanisms do not significantly affect the final dark matter relic density. In particular, for a model with a light dark photon mediator, the relic density can be reasonably estimated by considering that the dark matter is solely produced through the annihilation of Standard Model particles. This result considerably simplifies the treatment of a large class of dark matter theories, facilitating in particular the superimposition of the relic density constraints on the current and future experimental bounds. |
hep-ph/0406019 | Alicia Broncano | A. Broncano, M.B. Gavela, Elizabeth Jenkins | Renormalization of Lepton Mixing for Majorana Neutrinos | 28 pages. With axodraw | Nucl.Phys.B705:269-295,2005 | 10.1016/j.nuclphysb.2004.11.001 | null | hep-ph | null | We discuss the one-loop electroweak renormalization of the leptonic mixing
matrix in the case of Majorana neutrinos, and establish its relationship with
the renormalization group evolution of the dimension five operator responsible
for the light Majorana neutrino masses. We compare our results in the effective
theory with those in the full seesaw theory.
| [
{
"created": "Tue, 1 Jun 2004 18:18:46 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Broncano",
"A.",
""
],
[
"Gavela",
"M. B.",
""
],
[
"Jenkins",
"Elizabeth",
""
]
] | We discuss the one-loop electroweak renormalization of the leptonic mixing matrix in the case of Majorana neutrinos, and establish its relationship with the renormalization group evolution of the dimension five operator responsible for the light Majorana neutrino masses. We compare our results in the effective theory with those in the full seesaw theory. |
2403.17488 | Maximilian Berbig | Maximilian Berbig, Juan Herrero-Garcia, Giacomo Landini | Dynamical origin of neutrino masses and dark matter from a new confining
sector | v1: 7 pages, 2 figures + 1 appendix v2: added references and a
discussion on low-scale sterile neutrinos + minor corrections, matches
published version in PRD | Phys. Rev. D 110, 035011 (2024) | 10.1103/PhysRevD.110.035011 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A dynamical mechanism, based on a confining non-abelian dark symmetry, which
generates Majorana masses for hypercharge-less fermions, is proposed. We apply
it to the inverse seesaw scenario, which allows to generate light neutrino
masses from the interplay of TeV-scale Pseudo-Dirac mass terms and a small
explicit breaking of lepton number. A single generation of vector-like dark
quarks, transforming under a $\text{SU}(3)_\text{D}$ gauge symmetry, is coupled
to a real singlet scalar, which serves as a portal between the dark quark
condensate and three generations of heavy sterile neutrinos. Such a dark sector
and the Standard Model (SM) are kept in thermal equilibrium with each other via
sizeable Yukawa couplings to the heavy neutrinos. In this framework the
lightest dark baryon, which has spin $3/2$ and is stabilized at the
renormalizable level by an accidental dark baryon number symmetry, can account
for the observed relic density via thermal freeze-out from annihilations into
the lightest dark mesons. These mesons in turn decay to heavy neutrinos, which
produce SM final states upon decay. This model may be probed by next generation
neutrino telescopes via neutrino lines produced from dark matter annihilations.
| [
{
"created": "Tue, 26 Mar 2024 08:33:19 GMT",
"version": "v1"
},
{
"created": "Wed, 17 Jul 2024 13:34:44 GMT",
"version": "v2"
},
{
"created": "Wed, 7 Aug 2024 16:14:29 GMT",
"version": "v3"
}
] | 2024-08-08 | [
[
"Berbig",
"Maximilian",
""
],
[
"Herrero-Garcia",
"Juan",
""
],
[
"Landini",
"Giacomo",
""
]
] | A dynamical mechanism, based on a confining non-abelian dark symmetry, which generates Majorana masses for hypercharge-less fermions, is proposed. We apply it to the inverse seesaw scenario, which allows to generate light neutrino masses from the interplay of TeV-scale Pseudo-Dirac mass terms and a small explicit breaking of lepton number. A single generation of vector-like dark quarks, transforming under a $\text{SU}(3)_\text{D}$ gauge symmetry, is coupled to a real singlet scalar, which serves as a portal between the dark quark condensate and three generations of heavy sterile neutrinos. Such a dark sector and the Standard Model (SM) are kept in thermal equilibrium with each other via sizeable Yukawa couplings to the heavy neutrinos. In this framework the lightest dark baryon, which has spin $3/2$ and is stabilized at the renormalizable level by an accidental dark baryon number symmetry, can account for the observed relic density via thermal freeze-out from annihilations into the lightest dark mesons. These mesons in turn decay to heavy neutrinos, which produce SM final states upon decay. This model may be probed by next generation neutrino telescopes via neutrino lines produced from dark matter annihilations. |
2203.01561 | Yong Du | Ruiyu Zhou, Ligong Bian, Yong Du | Electroweak Phase Transition and Gravitational Waves in the Type-II
Seesaw Model | v1: 34 pages, 2 tables, 8 figures; v2: update references | null | 10.1007/JHEP08(2022)205 | null | hep-ph astro-ph.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The type-II seesaw model is a possible candidate for simultaneously
explaining non-vanishing neutrino masses and the observed baryon asymmetry of
the Universe. In this work, we study in detail the pattern of phase transition
and the gravitational wave production of this model. We find a strong
first-order electroweak phase transition generically prefers positive Higgs
portal couplings and a light triplet below $\sim550$ GeV. In addition, we find
the gravitational wave yield generated during the phase transition would be at
the edge of BBO sensitivity and could be further examined by Ultimate-DECIGO.
| [
{
"created": "Thu, 3 Mar 2022 08:22:39 GMT",
"version": "v1"
},
{
"created": "Mon, 11 Apr 2022 04:02:08 GMT",
"version": "v2"
}
] | 2022-09-07 | [
[
"Zhou",
"Ruiyu",
""
],
[
"Bian",
"Ligong",
""
],
[
"Du",
"Yong",
""
]
] | The type-II seesaw model is a possible candidate for simultaneously explaining non-vanishing neutrino masses and the observed baryon asymmetry of the Universe. In this work, we study in detail the pattern of phase transition and the gravitational wave production of this model. We find a strong first-order electroweak phase transition generically prefers positive Higgs portal couplings and a light triplet below $\sim550$ GeV. In addition, we find the gravitational wave yield generated during the phase transition would be at the edge of BBO sensitivity and could be further examined by Ultimate-DECIGO. |
2207.11264 | Christopher Schwan | Ansgar Denner, Giovanni Pelliccioli and Christopher Schwan | NLO QCD and EW corrections to off-shell $\mathrm{t}\mathrm{Z}\mathrm{j}$
production at the LHC | 24 pages, 10 figures, some extra comments added, version to appear in
JHEP | null | 10.1007/JHEP10(2022)125 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The production of a single top quark in association with a $\mathrm{Z}$ boson
($\mathrm{t}\mathrm{Z}\mathrm{j}$ production) at the LHC is a relevant probe of
the electroweak sector of the Standard Model as well as a window to possible
new-physics effects. The growing experimental interest in performing
differential measurements for this process demands an improved theoretical
modelling in realistic fiducial regions. In this article we present an
NLO-accurate $\mathrm{t}\mathrm{Z}\mathrm{j}$ calculation that includes
complete off-shell effects and spin correlations, combining QCD and electroweak
radiative corrections to the LO signal. Integrated and differential
cross-sections are shown for a fiducial setup characterized by three charged
leptons, two jets, and missing energy.
| [
{
"created": "Fri, 22 Jul 2022 18:00:02 GMT",
"version": "v1"
},
{
"created": "Tue, 18 Oct 2022 16:02:15 GMT",
"version": "v2"
}
] | 2022-11-15 | [
[
"Denner",
"Ansgar",
""
],
[
"Pelliccioli",
"Giovanni",
""
],
[
"Schwan",
"Christopher",
""
]
] | The production of a single top quark in association with a $\mathrm{Z}$ boson ($\mathrm{t}\mathrm{Z}\mathrm{j}$ production) at the LHC is a relevant probe of the electroweak sector of the Standard Model as well as a window to possible new-physics effects. The growing experimental interest in performing differential measurements for this process demands an improved theoretical modelling in realistic fiducial regions. In this article we present an NLO-accurate $\mathrm{t}\mathrm{Z}\mathrm{j}$ calculation that includes complete off-shell effects and spin correlations, combining QCD and electroweak radiative corrections to the LO signal. Integrated and differential cross-sections are shown for a fiducial setup characterized by three charged leptons, two jets, and missing energy. |
1508.07459 | Federico Alberto Ceccopieri | Federico Alberto Ceccopieri | Lambda production in the DIS target fragmentation region | 16 pages, 11 figures, updated experimental and theoretical errors
estimation. Accepted for publication in EPJC | null | 10.1140/epjc/s10052-016-3916-0 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | By using a recently obtained set of Lambda fracture functions, we present
predictions for Lambda production in the target fragmentation region of
Semi-Inclusive Deep Inelastic Scattering in CLAS@12 GeV kinematics,
supplemented with a conservative error estimates. We discuss a number of
observables sensitive to the assumptions of the underlying theory and many of
the assumptions of the proposed phenomenological model.
| [
{
"created": "Sat, 29 Aug 2015 15:09:41 GMT",
"version": "v1"
},
{
"created": "Mon, 5 Oct 2015 09:56:15 GMT",
"version": "v2"
},
{
"created": "Mon, 8 Feb 2016 10:49:58 GMT",
"version": "v3"
}
] | 2016-03-23 | [
[
"Ceccopieri",
"Federico Alberto",
""
]
] | By using a recently obtained set of Lambda fracture functions, we present predictions for Lambda production in the target fragmentation region of Semi-Inclusive Deep Inelastic Scattering in CLAS@12 GeV kinematics, supplemented with a conservative error estimates. We discuss a number of observables sensitive to the assumptions of the underlying theory and many of the assumptions of the proposed phenomenological model. |
1805.06256 | A. Yu. Petrov | A. P. Baeta Scarpelli, L. C. T. Brito, J. C. C. Felipe, J. R.
Nascimento, A. Yu. Petrov | Higher-order one-loop contributions in Lorentz-breaking QED | 10 pages | EPL, 123 (2018) 21001 | 10.1209/0295-5075/123/21001 | null | hep-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We calculate higher-order quantum contributions in different
Lorentz-violating parameters to the gauge sector of the extended QED. As a
result of this one-loop calculation, some terms which do not produce
first-order corrections, contribute with nontrivial gauge-invariant
second-order quantum inductions.
| [
{
"created": "Wed, 16 May 2018 11:53:16 GMT",
"version": "v1"
}
] | 2018-08-21 | [
[
"Scarpelli",
"A. P. Baeta",
""
],
[
"Brito",
"L. C. T.",
""
],
[
"Felipe",
"J. C. C.",
""
],
[
"Nascimento",
"J. R.",
""
],
[
"Petrov",
"A. Yu.",
""
]
] | We calculate higher-order quantum contributions in different Lorentz-violating parameters to the gauge sector of the extended QED. As a result of this one-loop calculation, some terms which do not produce first-order corrections, contribute with nontrivial gauge-invariant second-order quantum inductions. |
2006.16260 | Pham Ngoc Hoa Vuong | Sebastian A. R. Ellis, J\'er\'emie Quevillon, Pham Ngoc Hoa Vuong,
Tevong You, Zhengkang Zhang | The Fermionic Universal One-Loop Effective Action | 27 pages, 8 tables, Mathematica notebook available at
https://github.com/HoaVuong-lpsc/The-Fermionic-UOLEA-Mathematica-notebook | null | 10.1007/JHEP11(2020)078 | CERN-TH-2020-104, CALT-TH-2020-027 | hep-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Recent development of path integral matching techniques based on the
covariant derivative expansion has made manifest a universal structure of
one-loop effective Lagrangians. The universal terms can be computed once and
for all to serve as a reference for one-loop matching calculations and to ease
their automation. Here we present the fermionic universal one-loop effective
action (UOLEA), resulting from integrating out heavy fermions with scalar,
pseudo-scalar, vector and axial-vector couplings. We also clarify the relation
of the new terms computed here to terms previously computed in the literature
and those that remain to complete the UOLEA. Our results can be readily used to
efficiently obtain analytical expressions for effective operators arising from
heavy fermion loops.
| [
{
"created": "Mon, 29 Jun 2020 18:00:03 GMT",
"version": "v1"
}
] | 2021-03-17 | [
[
"Ellis",
"Sebastian A. R.",
""
],
[
"Quevillon",
"Jérémie",
""
],
[
"Vuong",
"Pham Ngoc Hoa",
""
],
[
"You",
"Tevong",
""
],
[
"Zhang",
"Zhengkang",
""
]
] | Recent development of path integral matching techniques based on the covariant derivative expansion has made manifest a universal structure of one-loop effective Lagrangians. The universal terms can be computed once and for all to serve as a reference for one-loop matching calculations and to ease their automation. Here we present the fermionic universal one-loop effective action (UOLEA), resulting from integrating out heavy fermions with scalar, pseudo-scalar, vector and axial-vector couplings. We also clarify the relation of the new terms computed here to terms previously computed in the literature and those that remain to complete the UOLEA. Our results can be readily used to efficiently obtain analytical expressions for effective operators arising from heavy fermion loops. |
hep-ph/0510308 | Oleg Tarasov | F. Jegerlehner and O.V. Tarasov | Explicit Results for the Anomalous Three Point Function and
Non-Renormalization Theorems | 10 pages, 2 Postscript figures, uses axodraw.sty | Phys.Lett. B639 (2006) 299-306 | 10.1016/j.physletb.2006.06.039 | HU-EP-05-66, DESY-05-211, SFB/CPP-05-69 | hep-ph | null | Two-loop corrections for the <VVA> correlator of the singlet axial and vector
currents in QCD are calculated in the chiral limit for arbitrary momenta.
Explicit calculations confirm the non-renormalization theorems derived recently
by Vainshtein and Knecht et.al. We find that as in the one-loop case also at
the two loops the <VVA> correlator has only 3 independent form-factors instead
of 4. From the explicit results we observe that the two-loop correction to the
correlator is equal to the one-loop result times the constant factor C_2(R)
alpha_s/pi in the MSbar scheme. This holds for the full correlator, for the
anomalous longitudinal as well as for the non- anomalous thansversal
amplitudes. The finite overall alpha_s dependent constant has to be normalized
away by renormalizing the axial current according to Witten's
algebraic/geometrical constraint on the anomalous Ward identity. Our
observations, together with known facts, suggest that in perturbation theory
the <VVA> correlator is proportional to the one-loop term to all orders and
that the non- renormalization theorem of the Adler-Bell-Jackiw anomaly carries
over to the full correlator.
| [
{
"created": "Sun, 23 Oct 2005 20:49:10 GMT",
"version": "v1"
}
] | 2009-11-11 | [
[
"Jegerlehner",
"F.",
""
],
[
"Tarasov",
"O. V.",
""
]
] | Two-loop corrections for the <VVA> correlator of the singlet axial and vector currents in QCD are calculated in the chiral limit for arbitrary momenta. Explicit calculations confirm the non-renormalization theorems derived recently by Vainshtein and Knecht et.al. We find that as in the one-loop case also at the two loops the <VVA> correlator has only 3 independent form-factors instead of 4. From the explicit results we observe that the two-loop correction to the correlator is equal to the one-loop result times the constant factor C_2(R) alpha_s/pi in the MSbar scheme. This holds for the full correlator, for the anomalous longitudinal as well as for the non- anomalous thansversal amplitudes. The finite overall alpha_s dependent constant has to be normalized away by renormalizing the axial current according to Witten's algebraic/geometrical constraint on the anomalous Ward identity. Our observations, together with known facts, suggest that in perturbation theory the <VVA> correlator is proportional to the one-loop term to all orders and that the non- renormalization theorem of the Adler-Bell-Jackiw anomaly carries over to the full correlator. |
hep-ph/9510383 | Ulrich Nierste | Ulrich Nierste | Phenomenology of $\varepsilon_K$ Beyond Leading Logarithms | 3 pages, talk given at the EPS-HEP-95 conference in Brussels, uses
LaTeX 2e, one figure included. Get a complete PostScript Version from
ftp://feynman.t30.physik.tu-muenchen.de/pub/preprints/tum-92-95.ps.gz | null | null | TUM-T31-92/95 | hep-ph | null | I present the QCD short distance coefficient $\eta_3$ of the $\Delta S=2$
hamiltonian in the \emph{next-to-leading order} (NLO) of renormalization group
improved perturbation theory. Since now all QCD-factors $\eta_1$, $\eta_2$ and
$\eta_3$ are known with NLO accuracy, a much higher precision in the analysis
of $\varepsilon_K$ can be achieved. The CKM phase $\delta$, $|V_{td}|$ and the
mass difference $\Delta m_{B_s}$ in the
$\text{B}_s^0-\overline{\text{B}}_s^0$-system are predicted from the measured
values of $\varepsilon_K$ and $\Delta m_{B_d}$. Finally I briefly look at the
\kkmd. This work has been done in collaboration with Stefan Herrlich.
| [
{
"created": "Tue, 24 Oct 1995 09:36:15 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Nierste",
"Ulrich",
""
]
] | I present the QCD short distance coefficient $\eta_3$ of the $\Delta S=2$ hamiltonian in the \emph{next-to-leading order} (NLO) of renormalization group improved perturbation theory. Since now all QCD-factors $\eta_1$, $\eta_2$ and $\eta_3$ are known with NLO accuracy, a much higher precision in the analysis of $\varepsilon_K$ can be achieved. The CKM phase $\delta$, $|V_{td}|$ and the mass difference $\Delta m_{B_s}$ in the $\text{B}_s^0-\overline{\text{B}}_s^0$-system are predicted from the measured values of $\varepsilon_K$ and $\Delta m_{B_d}$. Finally I briefly look at the \kkmd. This work has been done in collaboration with Stefan Herrlich. |
hep-ph/0506152 | Kresimir Kumericki | J. O. Eeg, K. Kumericki, I. Picek | Soft gluon contributions to the B --> K eta' amplitude in a low energy
bosonization model | 11 pages, 2 PS figures, LaTeX; references added and commented | J.Phys. G32 (2006) 2081-2088 | null | OSLO-TP-2-05, ZAGREB-ZTF-05-01 | hep-ph | null | Intriguing B --> K eta' decays provide a unique opportunity to study a
joining of two-gluon configurations arising from the penguin b --> sG and b -->
sGG transitions, with those inherent to the eta' particle. We employ the
heavy-light chiral quark model, applied previously to a somewhat related B -->
D eta' decay, as a calculational tool accounting for the nonperturbative soft
gluon contributions to the amplitude at hand. Thereby we arrive at a novel
contribution to the singlet penguin amplitude, which within our model accounts
for ~ 10 % of the measured B --> K eta' amplitude.
| [
{
"created": "Wed, 15 Jun 2005 20:10:23 GMT",
"version": "v1"
},
{
"created": "Sun, 20 Nov 2005 23:24:21 GMT",
"version": "v2"
},
{
"created": "Tue, 9 May 2006 12:22:31 GMT",
"version": "v3"
}
] | 2007-05-23 | [
[
"Eeg",
"J. O.",
""
],
[
"Kumericki",
"K.",
""
],
[
"Picek",
"I.",
""
]
] | Intriguing B --> K eta' decays provide a unique opportunity to study a joining of two-gluon configurations arising from the penguin b --> sG and b --> sGG transitions, with those inherent to the eta' particle. We employ the heavy-light chiral quark model, applied previously to a somewhat related B --> D eta' decay, as a calculational tool accounting for the nonperturbative soft gluon contributions to the amplitude at hand. Thereby we arrive at a novel contribution to the singlet penguin amplitude, which within our model accounts for ~ 10 % of the measured B --> K eta' amplitude. |
hep-ph/9712548 | Georg Raffelt | G.G.Raffelt (MPI Physics, Munich) | Astro-Particle Physics | 10 pages, 4 eps figures included, Proc. HEP97 Jerusalem, August 1997 | null | null | null | hep-ph | null | Recent developments of those areas of astro-particle physics are discussed
that were represented at the HEP97 conference. In particular, the current
status of direct and indirect dark-matter searches and of TeV neutrino and
gamma-ray astronomy will be reviewed.
| [
{
"created": "Wed, 31 Dec 1997 09:04:50 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Raffelt",
"G. G.",
"",
"MPI Physics, Munich"
]
] | Recent developments of those areas of astro-particle physics are discussed that were represented at the HEP97 conference. In particular, the current status of direct and indirect dark-matter searches and of TeV neutrino and gamma-ray astronomy will be reviewed. |
1309.4092 | Mikhail Solon | Richard J. Hill, Mikhail P. Solon (EFI, Univ. of Chicago) | WIMP-nucleon scattering with heavy WIMP effective theory | 5 pages, 5 figures. v2: modified discussion, additional section with
1 figure, PRL version | Phys. Rev. Lett. 112, 211602 (2014) | 10.1103/PhysRevLett.112.211602 | EFI 13-23 | hep-ph astro-ph.CO hep-lat | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The discovery of a Standard Model-like Higgs boson and the hitherto absence
of evidence for other new states may indicate that if WIMPs comprise
cosmological dark matter, they are heavy compared to electroweak scale
particles, $M \gg m_{W^\pm}, m_{Z^0}$. In this limit, the absolute cross
section for a WIMP of given electroweak quantum numbers to scatter from a
nucleon becomes computable in terms of Standard Model parameters. We develop
effective field theory techniques to analyze the heavy WIMP limit of
WIMP-nucleon scattering, and present the first complete calculation of the
leading spin-independent cross section in Standard Model extensions consisting
of one or two electroweak $SU(2)_W \times U(1)_Y$ multiplets.
| [
{
"created": "Mon, 16 Sep 2013 20:00:01 GMT",
"version": "v1"
},
{
"created": "Thu, 5 Jun 2014 15:59:32 GMT",
"version": "v2"
}
] | 2014-06-06 | [
[
"Hill",
"Richard J.",
"",
"EFI, Univ. of Chicago"
],
[
"Solon",
"Mikhail P.",
"",
"EFI, Univ. of Chicago"
]
] | The discovery of a Standard Model-like Higgs boson and the hitherto absence of evidence for other new states may indicate that if WIMPs comprise cosmological dark matter, they are heavy compared to electroweak scale particles, $M \gg m_{W^\pm}, m_{Z^0}$. In this limit, the absolute cross section for a WIMP of given electroweak quantum numbers to scatter from a nucleon becomes computable in terms of Standard Model parameters. We develop effective field theory techniques to analyze the heavy WIMP limit of WIMP-nucleon scattering, and present the first complete calculation of the leading spin-independent cross section in Standard Model extensions consisting of one or two electroweak $SU(2)_W \times U(1)_Y$ multiplets. |
hep-ph/9601234 | Leutwyler Heinrich | H. Leutwyler (University of Bern and CERN) | Bounds on the light quark masses | 11 pages, Latex | Phys.Lett. B374 (1996) 163-168 | 10.1016/0370-2693(96)85876-X | null | hep-ph | null | The corrections to the current algebra mass formulae for the pseudoscalar
mesons are analyzed by means of a simultaneous exansion in powers of the light
quark masses and powers of 1/N. A set of mass formulae is derived, including an
inequality, which leads to bounds for ratios of quark masses.
| [
{
"created": "Tue, 9 Jan 1996 21:44:09 GMT",
"version": "v1"
}
] | 2009-10-28 | [
[
"Leutwyler",
"H.",
"",
"University of Bern and CERN"
]
] | The corrections to the current algebra mass formulae for the pseudoscalar mesons are analyzed by means of a simultaneous exansion in powers of the light quark masses and powers of 1/N. A set of mass formulae is derived, including an inequality, which leads to bounds for ratios of quark masses. |
hep-ph/0409233 | Jurgen Berges | J. Berges | Introduction to Nonequilibrium Quantum Field Theory | 131 pages, figures | AIP Conf.Proc.739:3-62,2005 | 10.1063/1.1843591 | null | hep-ph astro-ph hep-lat hep-th nucl-th quant-ph | null | There has been substantial progress in recent years in the quantitative
understanding of the nonequilibrium time evolution of quantum fields. Important
topical applications, in particular in high energy particle physics and
cosmology, involve dynamics of quantum fields far away from the ground state or
thermal equilibrium. In these cases, standard approaches based on small
deviations from equilibrium, or on a sufficient homogeneity in time underlying
kinetic descriptions, are not applicable. A particular challenge is to connect
the far-from-equilibrium dynamics at early times with the approach to thermal
equilibrium at late times. Understanding the ``link'' between the early- and
the late-time behavior of quantum fields is crucial for a wide range of
phenomena. For the first time questions such as the explosive particle
production at the end of the inflationary universe, including the subsequent
process of thermalization, can be addressed in quantum field theory from first
principles. The progress in this field is based on efficient functional
integral techniques, so-called n-particle irreducible effective actions, for
which powerful nonperturbative approximation schemes are available. Here we
give an introduction to these techniques and show how they can be applied in
practice. Though we focus on particle physics and cosmology applications, we
emphasize that these techniques can be equally applied to other nonequilibrium
phenomena in complex many body systems.
| [
{
"created": "Mon, 20 Sep 2004 18:19:28 GMT",
"version": "v1"
}
] | 2010-02-04 | [
[
"Berges",
"J.",
""
]
] | There has been substantial progress in recent years in the quantitative understanding of the nonequilibrium time evolution of quantum fields. Important topical applications, in particular in high energy particle physics and cosmology, involve dynamics of quantum fields far away from the ground state or thermal equilibrium. In these cases, standard approaches based on small deviations from equilibrium, or on a sufficient homogeneity in time underlying kinetic descriptions, are not applicable. A particular challenge is to connect the far-from-equilibrium dynamics at early times with the approach to thermal equilibrium at late times. Understanding the ``link'' between the early- and the late-time behavior of quantum fields is crucial for a wide range of phenomena. For the first time questions such as the explosive particle production at the end of the inflationary universe, including the subsequent process of thermalization, can be addressed in quantum field theory from first principles. The progress in this field is based on efficient functional integral techniques, so-called n-particle irreducible effective actions, for which powerful nonperturbative approximation schemes are available. Here we give an introduction to these techniques and show how they can be applied in practice. Though we focus on particle physics and cosmology applications, we emphasize that these techniques can be equally applied to other nonequilibrium phenomena in complex many body systems. |
hep-ph/9805449 | Takehiko Asaka | T. Asaka and Masahiro Yamaguchi | Hadronic Axion Model in Gauge-Mediated Supersymmetry Breaking | 20 pages including seven postscript figures, reviced version to be
published in Physics Letters B | Phys.Lett. B437 (1998) 51-61 | 10.1016/S0370-2693(98)00890-9 | null | hep-ph astro-ph | null | A simple hadronic axion model is proposed in the framework of gauge-mediated
supersymmetry breaking. Dynamics of Peccei-Quinn symmetry breaking is governed
by supersymmetry breaking effects and the Peccei-Quinn breaking scale $f_{PQ}$
is inversely proportional to the gravitino mass. The gravitino mass range which
corresponds to the axion window $f_{PQ} \simeq 10^{9}$ GeV -- $10^{13}$ GeV
lies in the region predicted by gauge-mediated supersymmetry breaking models.
The model is also shown to be cosmologically viable.
| [
{
"created": "Mon, 25 May 1998 17:33:03 GMT",
"version": "v1"
},
{
"created": "Thu, 30 Jul 1998 02:24:17 GMT",
"version": "v2"
}
] | 2009-10-31 | [
[
"Asaka",
"T.",
""
],
[
"Yamaguchi",
"Masahiro",
""
]
] | A simple hadronic axion model is proposed in the framework of gauge-mediated supersymmetry breaking. Dynamics of Peccei-Quinn symmetry breaking is governed by supersymmetry breaking effects and the Peccei-Quinn breaking scale $f_{PQ}$ is inversely proportional to the gravitino mass. The gravitino mass range which corresponds to the axion window $f_{PQ} \simeq 10^{9}$ GeV -- $10^{13}$ GeV lies in the region predicted by gauge-mediated supersymmetry breaking models. The model is also shown to be cosmologically viable. |
2307.00746 | BoQiang Lu | Bo-Qiang Lu, Cheng-Wei Chiang, and Tianjun Li | Clockwork axion footprint on nano-hertz stochastic gravitational wave
background | 5+8 pages, 3+3 figures, 3 tables, accepted for publication in PRD
Lett | null | null | null | hep-ph astro-ph.HE | http://creativecommons.org/licenses/by-nc-sa/4.0/ | The recent Pulsar Timing Arrays (PTAs) nano-Hz gravitational wave (GW)
background signal can be naturally induced by the annihilation of domain walls
(DWs) formed at a symmetry-breaking scale $f\simeq 200$~TeV in the clockwork
axion framework. Based on our first successful and precise prediction, we for
the first time suggest that the recent PTA observations strongly support the
novel mechanism of the QCD instanton-induced DW annihilation in the clockwork
axion framework. We also for the first time discover a novel correlation
between dark matter (DM) relic abundance and nano-Hz GW background, which in
turn indicates a natural connection between the axion decay constant and the
symmetry-breaking scale in the clockwork framework. We find that the GW signal
has a peak $h^2\Omega_{\rm GW}\simeq 10^{-6.6}-10^{-6.1}$ at about 50~nHz,
which is definite and testable for future PTA data at frequencies $\gtrsim
25$~nHz and CMB-S4 experiment. We also propose various phenomena that may
appear in PTAs and future GW interferometers.
| [
{
"created": "Mon, 3 Jul 2023 04:46:24 GMT",
"version": "v1"
},
{
"created": "Thu, 4 Apr 2024 16:29:10 GMT",
"version": "v2"
}
] | 2024-04-05 | [
[
"Lu",
"Bo-Qiang",
""
],
[
"Chiang",
"Cheng-Wei",
""
],
[
"Li",
"Tianjun",
""
]
] | The recent Pulsar Timing Arrays (PTAs) nano-Hz gravitational wave (GW) background signal can be naturally induced by the annihilation of domain walls (DWs) formed at a symmetry-breaking scale $f\simeq 200$~TeV in the clockwork axion framework. Based on our first successful and precise prediction, we for the first time suggest that the recent PTA observations strongly support the novel mechanism of the QCD instanton-induced DW annihilation in the clockwork axion framework. We also for the first time discover a novel correlation between dark matter (DM) relic abundance and nano-Hz GW background, which in turn indicates a natural connection between the axion decay constant and the symmetry-breaking scale in the clockwork framework. We find that the GW signal has a peak $h^2\Omega_{\rm GW}\simeq 10^{-6.6}-10^{-6.1}$ at about 50~nHz, which is definite and testable for future PTA data at frequencies $\gtrsim 25$~nHz and CMB-S4 experiment. We also propose various phenomena that may appear in PTAs and future GW interferometers. |
0709.0137 | Hai-Yang Cheng | Hai-Yang Cheng and Kwei-Chou Yang | Hadronic charmless B decays B-> AP | 38 pages, 1 figure. The experimental limit in Fig.1 is updated | Phys.Rev.D76:114020,2007 | 10.1103/PhysRevD.76.114020 | null | hep-ph hep-ex | null | The two-body hadronic decays of B mesons into pseudoscalar and axial vector
mesons are studied within the framework of QCD factorization. The light-cone
distribution amplitudes (LCDAs) for $^3P_1$ and $^1P_1$ axial-vector mesons
have been evaluated using the QCD sum rule method. Owing to the G-parity, the
chiral-even two-parton light-cone distribution amplitudes of the $^3P_1$
($^1P_1$) mesons are symmetric (antisymmetric) under the exchange of quark and
anti-quark momentum fractions in the SU(3) limit. For chiral-odd LCDAs, it is
other way around. The main results are the following: (i) The predicted rates
for $a_1^\pm(1260)\pi^\mp$, $b_1^\pm(1235)\pi^\mp$, $b_1^0(1235)\pi^-$,
$a_1^+K^-$ and $b_1^+K^-$ modes are in good agreement with the data. However,
the naively expected ratios $Br(B^-\to a_1^0\pi^-)/Br(\ov B^0\to
a_1^+\pi^-)\leq 1$, $Br(B^-\to a_1^-\pi^0)/Br(\ov B^0\to a_1^-\pi^+)\sim
{1\over 2}$ and $Br(B^-\to b_1^0K^-)/Br(\ov B^0\to b_1^+K^-)\sim {1\over 2}$
are not borne out by experiment. This should be clarified by the improved
measurements of these decays. (ii) Since the $\bar B\to b_1K$ decays receive
sizable annihilation contributions, their rates are sensitive to the
interference between penguin and annihilation terms. The measurement of
$Br(\bar B^0\to b_1^+K^-)$ implies a destructive interference which in turn
indicates that the form factors for $B\to b_1$ and $B\to a_1$ transitions are
of opposite signs. (iii) Sizable power corrections such as weak annihilation
are needed to account for the observed rates of the penguin-dominated modes
$K_1^-(1270)\pi^+$ and $K_1^-(1400)\pi^+$.
| [
{
"created": "Mon, 3 Sep 2007 14:10:41 GMT",
"version": "v1"
},
{
"created": "Fri, 2 Nov 2007 07:23:10 GMT",
"version": "v2"
},
{
"created": "Sun, 18 Nov 2007 23:04:52 GMT",
"version": "v3"
}
] | 2008-11-26 | [
[
"Cheng",
"Hai-Yang",
""
],
[
"Yang",
"Kwei-Chou",
""
]
] | The two-body hadronic decays of B mesons into pseudoscalar and axial vector mesons are studied within the framework of QCD factorization. The light-cone distribution amplitudes (LCDAs) for $^3P_1$ and $^1P_1$ axial-vector mesons have been evaluated using the QCD sum rule method. Owing to the G-parity, the chiral-even two-parton light-cone distribution amplitudes of the $^3P_1$ ($^1P_1$) mesons are symmetric (antisymmetric) under the exchange of quark and anti-quark momentum fractions in the SU(3) limit. For chiral-odd LCDAs, it is other way around. The main results are the following: (i) The predicted rates for $a_1^\pm(1260)\pi^\mp$, $b_1^\pm(1235)\pi^\mp$, $b_1^0(1235)\pi^-$, $a_1^+K^-$ and $b_1^+K^-$ modes are in good agreement with the data. However, the naively expected ratios $Br(B^-\to a_1^0\pi^-)/Br(\ov B^0\to a_1^+\pi^-)\leq 1$, $Br(B^-\to a_1^-\pi^0)/Br(\ov B^0\to a_1^-\pi^+)\sim {1\over 2}$ and $Br(B^-\to b_1^0K^-)/Br(\ov B^0\to b_1^+K^-)\sim {1\over 2}$ are not borne out by experiment. This should be clarified by the improved measurements of these decays. (ii) Since the $\bar B\to b_1K$ decays receive sizable annihilation contributions, their rates are sensitive to the interference between penguin and annihilation terms. The measurement of $Br(\bar B^0\to b_1^+K^-)$ implies a destructive interference which in turn indicates that the form factors for $B\to b_1$ and $B\to a_1$ transitions are of opposite signs. (iii) Sizable power corrections such as weak annihilation are needed to account for the observed rates of the penguin-dominated modes $K_1^-(1270)\pi^+$ and $K_1^-(1400)\pi^+$. |
2310.06039 | Basabendu Barman | Basabendu Barman, Nicol\'as Bernal and Javier Rubio | Rescuing Gravitational-Reheating in Chaotic Inflation | 23 pages, 6 figures, 1 table; version accepted for JCAP | null | null | null | hep-ph astro-ph.CO | http://creativecommons.org/licenses/by/4.0/ | We show, within the single-field inflationary paradigm, that a linear
non-minimal interaction $\xi\,M_P\,\phi\,R$ between the inflaton field $\phi$
and the Ricci scalar $R$ can result in successful inflation that concludes with
an efficient heating of the Universe via perturbative decays of the inflaton,
aided entirely by gravity. Considering the inflaton field to oscillate in a
quadratic potential, we find that $\mathcal{O}(10^{-1}) \lesssim \xi \lesssim
\mathcal{O}(10^2)$ is required to satisfy the observational bounds from Cosmic
Microwave Background (CMB) and Big Bang Nucleosynthesis (BBN). Interestingly,
the upper bound on the non-minimal coupling guarantees a tensor-to-scalar ratio
$r \gtrsim 10^{-4}$, within the range of current and future planned
experiments. We also discuss implications of dark matter production, along with
the potential generation of the matter-antimatter asymmetry resulting from
inflaton decay, through the same gravity portal.
| [
{
"created": "Mon, 9 Oct 2023 18:00:07 GMT",
"version": "v1"
},
{
"created": "Wed, 17 Apr 2024 17:36:29 GMT",
"version": "v2"
}
] | 2024-04-18 | [
[
"Barman",
"Basabendu",
""
],
[
"Bernal",
"Nicolás",
""
],
[
"Rubio",
"Javier",
""
]
] | We show, within the single-field inflationary paradigm, that a linear non-minimal interaction $\xi\,M_P\,\phi\,R$ between the inflaton field $\phi$ and the Ricci scalar $R$ can result in successful inflation that concludes with an efficient heating of the Universe via perturbative decays of the inflaton, aided entirely by gravity. Considering the inflaton field to oscillate in a quadratic potential, we find that $\mathcal{O}(10^{-1}) \lesssim \xi \lesssim \mathcal{O}(10^2)$ is required to satisfy the observational bounds from Cosmic Microwave Background (CMB) and Big Bang Nucleosynthesis (BBN). Interestingly, the upper bound on the non-minimal coupling guarantees a tensor-to-scalar ratio $r \gtrsim 10^{-4}$, within the range of current and future planned experiments. We also discuss implications of dark matter production, along with the potential generation of the matter-antimatter asymmetry resulting from inflaton decay, through the same gravity portal. |
1803.04795 | Takaaki Nomura | Takaaki Nomura, Hiroshi Okada | Zee-Babu type model with $U(1)_{L_\mu - L_\tau}$ gauge symmetry | 15 pages, 3 figures, version accepted for publication in physical
review D | Phys. Rev. D 97, 095023 (2018) | 10.1103/PhysRevD.97.095023 | KIAS-P18024 | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We extend the Zee-Babu model introducing local $U(1)_{L_\mu - L_\tau}$
symmetry with several singly-charged bosons. We find a predictive neutrino mass
texture in a simple hypothesis that mixings among singly-charged bosons are
negligible. Also lepton flavor violations are less constrained compared with
the original model. Then we explore testability of the model focussing on a
doubly-charged boson physics at the LHC and the ILC.
| [
{
"created": "Tue, 13 Mar 2018 13:38:25 GMT",
"version": "v1"
},
{
"created": "Mon, 7 May 2018 14:23:07 GMT",
"version": "v2"
}
] | 2018-05-23 | [
[
"Nomura",
"Takaaki",
""
],
[
"Okada",
"Hiroshi",
""
]
] | We extend the Zee-Babu model introducing local $U(1)_{L_\mu - L_\tau}$ symmetry with several singly-charged bosons. We find a predictive neutrino mass texture in a simple hypothesis that mixings among singly-charged bosons are negligible. Also lepton flavor violations are less constrained compared with the original model. Then we explore testability of the model focussing on a doubly-charged boson physics at the LHC and the ILC. |
1103.1318 | Gavin Salam | Gavin P. Salam | Perturbative QCD for the LHC | 14 pages, writeup of invited plenary talk at ICHEP, Paris, July 2010 | null | null | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | These proceedings discuss some of the highlights of recent research in
perturbative QCD as it relates to the LHC. Topics covered include the new
generation of Monte Carlo event generators, the revolution that is occurring in
NLO calculations, progress towards NNLO predictions and developments in the
definition and use of jets.
| [
{
"created": "Mon, 7 Mar 2011 16:42:41 GMT",
"version": "v1"
}
] | 2011-03-08 | [
[
"Salam",
"Gavin P.",
""
]
] | These proceedings discuss some of the highlights of recent research in perturbative QCD as it relates to the LHC. Topics covered include the new generation of Monte Carlo event generators, the revolution that is occurring in NLO calculations, progress towards NNLO predictions and developments in the definition and use of jets. |
2102.08140 | Jan Fotakis | Jan A. Fotakis, Olga Soloveva, Carsten Greiner, Olaf Kaczmarek and
Elena Bratkovskaya | Diffusion coefficient matrix of the strongly interacting quark-gluon
plasma | 16 pages, 10 figures | Phys. Rev. D 104, 034014 (2021) | 10.1103/PhysRevD.104.034014 | null | hep-ph nucl-th | http://creativecommons.org/licenses/by/4.0/ | We study the diffusion properties of the strongly interacting quark-gluon
plasma (sQGP) and evaluate the diffusion coefficient matrix for the baryon
($B$), strange ($S$) and electric ($Q$) charges - $\kappa_{qq'}$ ($q,q' = B, S,
Q$) and show their dependence on temperature $T$ and baryon chemical potential
$\mu_B$. The non-perturbative nature of the sQGP is evaluated within the
Dynamical Quasi-Particle Model (DQPM) which is matched to reproduce the
equation of state of the partonic matter above the deconfinement temperature
$T_c$ from lattice QCD. The calculation of diffusion coefficients is based on
two methods: i) the Chapman-Enskog method for the linearized Boltzmann
equation, which allows to explore non-equilibrium corrections for the
phase-space distribution function in leading order of the Knudsen numbers as
well as ii) the relaxation time approximation (RTA). In this work we explore
the differences between the two methods. We find a good agreement with the
available lattice QCD data in case of the electric charge diffusion coefficient
(or electric conductivity) at vanishing baryon chemical potential as well as a
qualitative agreement with the recent predictions from the holographic approach
for all diagonal components of the diffusion coefficient matrix. The knowledge
of the diffusion coefficient matrix is also of special interest for more
accurate hydrodynamic simulations.
| [
{
"created": "Tue, 16 Feb 2021 13:24:48 GMT",
"version": "v1"
}
] | 2021-08-25 | [
[
"Fotakis",
"Jan A.",
""
],
[
"Soloveva",
"Olga",
""
],
[
"Greiner",
"Carsten",
""
],
[
"Kaczmarek",
"Olaf",
""
],
[
"Bratkovskaya",
"Elena",
""
]
] | We study the diffusion properties of the strongly interacting quark-gluon plasma (sQGP) and evaluate the diffusion coefficient matrix for the baryon ($B$), strange ($S$) and electric ($Q$) charges - $\kappa_{qq'}$ ($q,q' = B, S, Q$) and show their dependence on temperature $T$ and baryon chemical potential $\mu_B$. The non-perturbative nature of the sQGP is evaluated within the Dynamical Quasi-Particle Model (DQPM) which is matched to reproduce the equation of state of the partonic matter above the deconfinement temperature $T_c$ from lattice QCD. The calculation of diffusion coefficients is based on two methods: i) the Chapman-Enskog method for the linearized Boltzmann equation, which allows to explore non-equilibrium corrections for the phase-space distribution function in leading order of the Knudsen numbers as well as ii) the relaxation time approximation (RTA). In this work we explore the differences between the two methods. We find a good agreement with the available lattice QCD data in case of the electric charge diffusion coefficient (or electric conductivity) at vanishing baryon chemical potential as well as a qualitative agreement with the recent predictions from the holographic approach for all diagonal components of the diffusion coefficient matrix. The knowledge of the diffusion coefficient matrix is also of special interest for more accurate hydrodynamic simulations. |
1208.5166 | Jonathan Kozaczuk | Jonathan Kozaczuk, Stefano Profumo, and Carroll L. Wainwright | Accidental Supersymmetric Dark Matter and Baryogenesis | 36 pages, 10 figures | null | 10.1088/1475-7516/2013/01/027 | null | hep-ph astro-ph.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We show that "accidental" supersymmetry is a beyond-the-Standard Model
framework that naturally accommodates a thermal relic dark matter candidate and
successful electroweak baryogenesis, including the needed strongly first-order
character of the electroweak phase transition. We study the phenomenology of
this setup from the standpoint of both dark matter and baryogenesis. For
energies around the electroweak phase transition temperature, the low-energy
effective theory is similar to the MSSM with light super-partners of the
third-generation quarks and of the Higgs and gauge bosons. We calculate the
dark matter relic abundance and the baryon asymmetry across the accidental
supersymmetry parameter space, including resonant and non-resonant CP-violating
sources. We find that there are regions of parameter space producing both the
observed value of the baryon asymmetry and a dark matter candidate with the
correct relic density and conforming to present-day constraints from dark
matter searches. This scenario makes sharp predictions for the particle
spectrum, predicting a lightest neutralino mass between 200 and 500 GeV, with
all charginos and neutralinos within less than a factor 2 of the lightest
neutralino mass and the heavy Higgs sector within 20-25% of that mass, making
it an interesting target for collider searches. In addition, we demonstrate
that successful accidental supersymmetric dark matter and baryogenesis will be
conclusively tested with improvements smaller than one order of magnitude to
the current performance of electron electric dipole moment searches and of
direct dark matter searches, as well as with IceCube plus Deep Core neutrino
telescope data.
| [
{
"created": "Sat, 25 Aug 2012 20:04:29 GMT",
"version": "v1"
}
] | 2015-06-11 | [
[
"Kozaczuk",
"Jonathan",
""
],
[
"Profumo",
"Stefano",
""
],
[
"Wainwright",
"Carroll L.",
""
]
] | We show that "accidental" supersymmetry is a beyond-the-Standard Model framework that naturally accommodates a thermal relic dark matter candidate and successful electroweak baryogenesis, including the needed strongly first-order character of the electroweak phase transition. We study the phenomenology of this setup from the standpoint of both dark matter and baryogenesis. For energies around the electroweak phase transition temperature, the low-energy effective theory is similar to the MSSM with light super-partners of the third-generation quarks and of the Higgs and gauge bosons. We calculate the dark matter relic abundance and the baryon asymmetry across the accidental supersymmetry parameter space, including resonant and non-resonant CP-violating sources. We find that there are regions of parameter space producing both the observed value of the baryon asymmetry and a dark matter candidate with the correct relic density and conforming to present-day constraints from dark matter searches. This scenario makes sharp predictions for the particle spectrum, predicting a lightest neutralino mass between 200 and 500 GeV, with all charginos and neutralinos within less than a factor 2 of the lightest neutralino mass and the heavy Higgs sector within 20-25% of that mass, making it an interesting target for collider searches. In addition, we demonstrate that successful accidental supersymmetric dark matter and baryogenesis will be conclusively tested with improvements smaller than one order of magnitude to the current performance of electron electric dipole moment searches and of direct dark matter searches, as well as with IceCube plus Deep Core neutrino telescope data. |
1103.0924 | Jose Rodriguez-Quintero | J. Rodr\'iguez-Quintero | A brief comment on the similarities of the IR solutions for the ghost
propagator DSE in Landau and Coulomb gauges | 4 pages, 1 figure | Phys.Rev.D83:097501,2011 | 10.1103/PhysRevD.83.097501 | UHU-FT/11-03 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | This brief note is devoted to reconcile the conclusions from a recent
analysis of the IR solutions for the ghost propagator Dyson-Schwinger equations
in Coulomb gauge with previous studies in Landau gauge.
| [
{
"created": "Fri, 4 Mar 2011 15:41:17 GMT",
"version": "v1"
}
] | 2016-08-14 | [
[
"Rodríguez-Quintero",
"J.",
""
]
] | This brief note is devoted to reconcile the conclusions from a recent analysis of the IR solutions for the ghost propagator Dyson-Schwinger equations in Coulomb gauge with previous studies in Landau gauge. |
hep-ph/9401244 | Ed Stoeffhaas | H.N.Chehime and D.Zeppenfeld | Evidence for a Hard Pomeron in Perturbative QCD | Revtex version 2 or 3 compatible, 17 pages. 7 postscript figures
included (packed using uufiles), also available by fax or regular mail upon
request. MAD/PH/814 | null | null | null | hep-ph | null | The $t$-channel exchange of two gluons in a color singlet state represents
the lowest order approximation to the Pomeron. This exchange mechanism is
thought to also explain the formation of rapidity gaps in dijet events at the
Tevatron. At the perturbative level this requires suppressed gluon emission in
the rapidity interval between widely separated jets, analogous to color
coherence effects in $t$-channel photon exchange. By calculating the imaginary
part of the two gluon, color singlet exchange amplitude we show how this
pattern does emerge for gluon emission at small transverse momenta. At large
$p_T$ the radiation pattern characteristic for color octet single gluon
exchange is reproduced.
| [
{
"created": "Wed, 12 Jan 1994 22:14:46 GMT",
"version": "v1"
},
{
"created": "Thu, 14 Jul 1994 15:57:03 GMT",
"version": "v2"
}
] | 2009-09-25 | [
[
"Chehime",
"H. N.",
""
],
[
"Zeppenfeld",
"D.",
""
]
] | The $t$-channel exchange of two gluons in a color singlet state represents the lowest order approximation to the Pomeron. This exchange mechanism is thought to also explain the formation of rapidity gaps in dijet events at the Tevatron. At the perturbative level this requires suppressed gluon emission in the rapidity interval between widely separated jets, analogous to color coherence effects in $t$-channel photon exchange. By calculating the imaginary part of the two gluon, color singlet exchange amplitude we show how this pattern does emerge for gluon emission at small transverse momenta. At large $p_T$ the radiation pattern characteristic for color octet single gluon exchange is reproduced. |
2302.13697 | Howard E. Haber | Joseph M. Connell, Pedro Ferreira, Howard E. Haber | Accommodating Hints of New Heavy Scalars in the Framework of the
Flavor-Aligned Two-Higgs-Doublet Model | 49 pages, 19 figures, 15 tables; v2: minor tweaks and some added
references; v3: better implementation of the CMS 95% ditau exclusion region
and projections of Scenario 2 for Run 3 of the LHC added; v4: minor tweaks
and some updated references; version accepted for publication in Physical
Review D; v5: two additional references added | null | null | SCIPP-22/02 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Searches for new neutral Higgs bosons of an extended Higgs sector at the LHC
can be interpreted in the framework of the two-Higgs doublet model. By
employing generic flavor-aligned Higgs-fermion Yukawa couplings, we propose an
analysis that uses experimental data to determine whether flavor alignment is a
consequence of a symmetry that is either exact or at most softly broken. We
illustrate our proposal in two different scenarios based on a few 3 sigma
(local) excesses observed by the ATLAS and CMS Collaborations in their searches
for heavy scalars. In Scenario 1, an excess of events is interpreted as $A\to
ZH\to \ell^+\ell^- b\bar{b}$ (where $\ell=e$ or $\mu$), with the CP-odd and
CP-even neutral scalar masses given by $m_A=610$ GeV and $m_H=290$ GeV,
respectively. In Scenario 2, an excess of events in the production of
$t\bar{t}$ and $\tau^+\tau^-$ final states is interpreted as decays of a CP-odd
scalar of mass $m_A=400$ GeV. Scenario 1 is consistent with Type-I Yukawa
interactions, which can arise in a 2HDM subject to a softly-broken
$\mathbb{Z}_2$ discrete symmetry. Scenario 2 is inconsistent with a
symmetry-based flavor alignment, but can be consistent with more general
flavor-aligned Higgs-fermion Yukawa couplings.
| [
{
"created": "Mon, 27 Feb 2023 11:55:52 GMT",
"version": "v1"
},
{
"created": "Sun, 12 Mar 2023 02:08:17 GMT",
"version": "v2"
},
{
"created": "Wed, 5 Jul 2023 06:00:15 GMT",
"version": "v3"
},
{
"created": "Mon, 21 Aug 2023 04:34:06 GMT",
"version": "v4"
},
{
"cr... | 2023-09-26 | [
[
"Connell",
"Joseph M.",
""
],
[
"Ferreira",
"Pedro",
""
],
[
"Haber",
"Howard E.",
""
]
] | Searches for new neutral Higgs bosons of an extended Higgs sector at the LHC can be interpreted in the framework of the two-Higgs doublet model. By employing generic flavor-aligned Higgs-fermion Yukawa couplings, we propose an analysis that uses experimental data to determine whether flavor alignment is a consequence of a symmetry that is either exact or at most softly broken. We illustrate our proposal in two different scenarios based on a few 3 sigma (local) excesses observed by the ATLAS and CMS Collaborations in their searches for heavy scalars. In Scenario 1, an excess of events is interpreted as $A\to ZH\to \ell^+\ell^- b\bar{b}$ (where $\ell=e$ or $\mu$), with the CP-odd and CP-even neutral scalar masses given by $m_A=610$ GeV and $m_H=290$ GeV, respectively. In Scenario 2, an excess of events in the production of $t\bar{t}$ and $\tau^+\tau^-$ final states is interpreted as decays of a CP-odd scalar of mass $m_A=400$ GeV. Scenario 1 is consistent with Type-I Yukawa interactions, which can arise in a 2HDM subject to a softly-broken $\mathbb{Z}_2$ discrete symmetry. Scenario 2 is inconsistent with a symmetry-based flavor alignment, but can be consistent with more general flavor-aligned Higgs-fermion Yukawa couplings. |
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