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|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
1801.06084 | Andreas Vogt | B. Ruijl (Zurich, ETH), F. Herzog, T. Ueda, J.A.M. Vermaseren (NIKHEF,
Amsterdam) and A. Vogt (Liverpool U., Dept. Math.) | R*-operation and five-loop calculations | 12 pages, LaTeX (PoS style), 2 eps-figures. Contribution to the
proceedings of `RADCOR 2017', St. Gilgen (Austria), September 2017 and
(shortened) to the proceedings of `ACAT 2017', Seattle (USA), August 2017 | null | null | Nikhef 2018-003, LTH 1149 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We sketch how the R*-operation can be used to compute the pole terms of
Feynman diagrams. We identify computational difficulties when performing
five-loop calculations, and provide four solutions that drastically reduce the
number of terms that are generated. Using these methods, we have computed the
beta function for Yang-Mills theory with fermions, the R-ratio in
electron-positron annihilation, and Higgs decays to quarks and gluons at
five-loop accuracy. The results for the beta function and Higgs decay width to
gluons in the heavy-top limit are briefly discussed. There is no need for
six-loop extensions of these calculations in the near future.
| [
{
"created": "Thu, 18 Jan 2018 15:06:17 GMT",
"version": "v1"
}
] | 2018-01-19 | [
[
"Ruijl",
"B.",
"",
"Zurich, ETH"
],
[
"Herzog",
"F.",
"",
"NIKHEF,\n Amsterdam"
],
[
"Ueda",
"T.",
"",
"NIKHEF,\n Amsterdam"
],
[
"Vermaseren",
"J. A. M.",
"",
"NIKHEF,\n Amsterdam"
],
[
"Vogt",
"A.",
"",
"Liverpool U., Dept. Math."
]
] | We sketch how the R*-operation can be used to compute the pole terms of Feynman diagrams. We identify computational difficulties when performing five-loop calculations, and provide four solutions that drastically reduce the number of terms that are generated. Using these methods, we have computed the beta function for Yang-Mills theory with fermions, the R-ratio in electron-positron annihilation, and Higgs decays to quarks and gluons at five-loop accuracy. The results for the beta function and Higgs decay width to gluons in the heavy-top limit are briefly discussed. There is no need for six-loop extensions of these calculations in the near future. |
2308.14871 | Lei Chang | Xiaobin Wang, Minghui Ding and Lei Chang | Sieving parton distribution function moments via the moment problem | 6 pages, 2 figures | null | null | null | hep-ph hep-lat | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We apply a classical mathematical problem, the moment problem, with its
related mathematical achievements, to the study of the parton distribution
function (PDF) in hadron physics, and propose a strategy to sieve the moments
of the PDF by exploiting its properties such as continuity, unimodality, and
symmetry. Through an error-inclusive sifting process, we refine three sets of
PDF moments from Lattice QCD. This refinement significantly reduces the errors,
particularly for higher order moments, and locates the peak of PDF
simultaneously. As our strategy is universally applicable to PDF moments from
any method, we strongly advocate its integration into all PDF moment
calculations.
| [
{
"created": "Mon, 28 Aug 2023 19:47:43 GMT",
"version": "v1"
},
{
"created": "Thu, 26 Oct 2023 08:08:58 GMT",
"version": "v2"
}
] | 2023-10-27 | [
[
"Wang",
"Xiaobin",
""
],
[
"Ding",
"Minghui",
""
],
[
"Chang",
"Lei",
""
]
] | We apply a classical mathematical problem, the moment problem, with its related mathematical achievements, to the study of the parton distribution function (PDF) in hadron physics, and propose a strategy to sieve the moments of the PDF by exploiting its properties such as continuity, unimodality, and symmetry. Through an error-inclusive sifting process, we refine three sets of PDF moments from Lattice QCD. This refinement significantly reduces the errors, particularly for higher order moments, and locates the peak of PDF simultaneously. As our strategy is universally applicable to PDF moments from any method, we strongly advocate its integration into all PDF moment calculations. |
1308.4394 | Kyohei Mukaida | Kyohei Mukaida, Kazunori Nakayama, Masahiro Takimoto | Fate of $Z_2$ Symmetric Scalar Field | 32 pages, 2 figures; v2: reflect the published version | JHEP 1312: 053, 2013 | 10.1007/JHEP12(2013)053 | UT-13-30 | hep-ph astro-ph.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The evolution of a coherently oscillating scalar field with $Z_2$ symmetry is
studied in detail. We calculate the dissipation rate of the scalar field based
on the closed time path formalism. Consequently, it is shown that the energy
density of the coherent oscillation can be efficiently dissipated if the
coupling constant is larger than the critical value, even though the scalar
particle is stable due to the $Z_2$ symmetry.
| [
{
"created": "Tue, 20 Aug 2013 19:40:02 GMT",
"version": "v1"
},
{
"created": "Tue, 10 Dec 2013 08:59:37 GMT",
"version": "v2"
}
] | 2013-12-18 | [
[
"Mukaida",
"Kyohei",
""
],
[
"Nakayama",
"Kazunori",
""
],
[
"Takimoto",
"Masahiro",
""
]
] | The evolution of a coherently oscillating scalar field with $Z_2$ symmetry is studied in detail. We calculate the dissipation rate of the scalar field based on the closed time path formalism. Consequently, it is shown that the energy density of the coherent oscillation can be efficiently dissipated if the coupling constant is larger than the critical value, even though the scalar particle is stable due to the $Z_2$ symmetry. |
2209.13409 | Damir Becirevic | Damir Be\v{c}irevi\'c and Florentin Jaffredo | Looking for the effects of New Physics in the $\Lambda_b \longrightarrow
\Lambda_c(\to \Lambda \pi) \ell \nu $ decay mode | 33p, 6 figs [v2, 2 small typos corrected, 1 reference added] | null | null | null | hep-ph hep-ex hep-lat | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | One of the most pragmatic ways to look for the effects of New Physics at low
energy scales is to study a detailed angular distribution of various decay
modes, and in particular those based on $b\to c\ell\bar \nu_\ell$. In this
paper we focus onto $\Lambda_b \longrightarrow \Lambda_c(\to \Lambda \pi) \ell
\nu$ in a generic effective theory setup in which, besides the Standard Model,
we allow for all the possible covariant dimension-six effective operators
capturing the contributions arising at high energy scales, beyond the Standard
Model. We list a number of observables that could be used as a diagnostic tool
to check for the presence of New Physics and to discriminate among its various
scenarios. We also briefly comment on $\Lambda_c \to \Lambda l\nu$.
| [
{
"created": "Tue, 27 Sep 2022 14:10:26 GMT",
"version": "v1"
},
{
"created": "Thu, 3 Nov 2022 10:58:01 GMT",
"version": "v2"
}
] | 2022-11-04 | [
[
"Bečirević",
"Damir",
""
],
[
"Jaffredo",
"Florentin",
""
]
] | One of the most pragmatic ways to look for the effects of New Physics at low energy scales is to study a detailed angular distribution of various decay modes, and in particular those based on $b\to c\ell\bar \nu_\ell$. In this paper we focus onto $\Lambda_b \longrightarrow \Lambda_c(\to \Lambda \pi) \ell \nu$ in a generic effective theory setup in which, besides the Standard Model, we allow for all the possible covariant dimension-six effective operators capturing the contributions arising at high energy scales, beyond the Standard Model. We list a number of observables that could be used as a diagnostic tool to check for the presence of New Physics and to discriminate among its various scenarios. We also briefly comment on $\Lambda_c \to \Lambda l\nu$. |
1202.1752 | Xavier Calmet | Stephen M. Barr and Xavier Calmet | Grand Unification without Higgs Bosons | 8 pages, to be published in the proceedings devoted to the Scientific
and Human Legacy of Julius Wess, initiated by the JW2011 Workshop, August 27
- 28, 2011, Donji Milanovac, Serbia | null | 10.1142/S2010194512006691 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We discuss how a model for the electroweak interactions without a Higgs could
be embedded into a grand unified theory. The requirement of a non-trivial fixed
point in the SU(2) sector of the weak interactions together with the
requirement of the numerical unification of the gauge couplings leads to a
prediction for the value of the SU(2) gauge coupling in the fixed point regime.
The fixed point regime must be in the TeV region to solve the unitarity problem
in the elastic scattering of W bosons. We find that the unification scale is at
about 10^{14} GeV. Viable grand unified theories must thus conserve baryon
number. We discuss how to build such a model without using Higgs bosons.
| [
{
"created": "Wed, 8 Feb 2012 16:11:58 GMT",
"version": "v1"
}
] | 2015-06-04 | [
[
"Barr",
"Stephen M.",
""
],
[
"Calmet",
"Xavier",
""
]
] | We discuss how a model for the electroweak interactions without a Higgs could be embedded into a grand unified theory. The requirement of a non-trivial fixed point in the SU(2) sector of the weak interactions together with the requirement of the numerical unification of the gauge couplings leads to a prediction for the value of the SU(2) gauge coupling in the fixed point regime. The fixed point regime must be in the TeV region to solve the unitarity problem in the elastic scattering of W bosons. We find that the unification scale is at about 10^{14} GeV. Viable grand unified theories must thus conserve baryon number. We discuss how to build such a model without using Higgs bosons. |
hep-ph/0410105 | Michael Klasen | M. Klasen (LPSC Grenoble), G. Kramer (Univ. Hamburg) | Evidence for Factorization Breaking in Diffractive Low-Q^2 Dijet
Production | 4 pages, 3 figures | Phys.Rev.Lett. 93 (2004) 232002 | 10.1103/PhysRevLett.93.232002 | LPSC 04-069 | hep-ph | null | We calculate diffractive dijet production in deep-inelastic scattering at
next-to-leading order of perturbative QCD, including contributions from direct
and resolved photons, and compare our predictions to preliminary data from the
H1 collaboration at HERA. In contrast to recent experimental claims, evidence
for factorization breaking is found only for resolved, and not direct, photon
contributions. No evidence is found for large normalization uncertainties in
diffractive parton densities. The results confirm theoretical expectations for
the (non-)cancellation of soft singularities in diffractive scattering as well
as previous results for (almost) real photoproduction.
| [
{
"created": "Thu, 7 Oct 2004 13:13:39 GMT",
"version": "v1"
}
] | 2009-11-10 | [
[
"Klasen",
"M.",
"",
"LPSC Grenoble"
],
[
"Kramer",
"G.",
"",
"Univ. Hamburg"
]
] | We calculate diffractive dijet production in deep-inelastic scattering at next-to-leading order of perturbative QCD, including contributions from direct and resolved photons, and compare our predictions to preliminary data from the H1 collaboration at HERA. In contrast to recent experimental claims, evidence for factorization breaking is found only for resolved, and not direct, photon contributions. No evidence is found for large normalization uncertainties in diffractive parton densities. The results confirm theoretical expectations for the (non-)cancellation of soft singularities in diffractive scattering as well as previous results for (almost) real photoproduction. |
hep-ph/9512340 | Andreas Laser | J. Kripfganz, A. Laser, M.G. Schmidt | Perturbative Contributions to the Electroweak Interface Tension | 17 pages, 5 figures; a compressed postscript including the figures is
available at http://www.thphys.uni-heidelberg.de/~laser/hd-thep-95-53.ps.Z | Z.Phys. C73 (1997) 353-362 | null | HD-THEP-95-53 | hep-ph | null | The main perturbative contribution to the free energy of an electroweak
interface is due to the effective potential and the tree level kinetic term.
The derivative corrections are investigated with one-loop perturbation theory.
The action is treated in derivative, in heat kernel, and in a multi local
expansion. The massive contributions turn out to be well described by the
Z-factor. The massless mode, plagued by infrared problems, is numerically less
important. Its perturbatively reliable part can by calculated in derivative
expansion as well. A self consistent way to include the Z-factor in the formula
for the interface tension is presented.
| [
{
"created": "Mon, 18 Dec 1995 17:47:45 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Kripfganz",
"J.",
""
],
[
"Laser",
"A.",
""
],
[
"Schmidt",
"M. G.",
""
]
] | The main perturbative contribution to the free energy of an electroweak interface is due to the effective potential and the tree level kinetic term. The derivative corrections are investigated with one-loop perturbation theory. The action is treated in derivative, in heat kernel, and in a multi local expansion. The massive contributions turn out to be well described by the Z-factor. The massless mode, plagued by infrared problems, is numerically less important. Its perturbatively reliable part can by calculated in derivative expansion as well. A self consistent way to include the Z-factor in the formula for the interface tension is presented. |
1307.0283 | Sergey Troshin | S.M. Troshin, N.E. Tyurin | Is elastic scattering at the LHC absorptive or geometric? | 8 pages, no figures, final version to be published in Phys. Rev. D | Phys. Rev. D 88, 077502 (2013) | 10.1103/PhysRevD.88.077502 | null | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We discuss the role of the impact--parameter dependent quantities. Their use
along with the available experimental data on elastic scattering at the LHC
could serve for an additional insight into the asymptotics.
| [
{
"created": "Mon, 1 Jul 2013 07:21:55 GMT",
"version": "v1"
},
{
"created": "Wed, 4 Sep 2013 14:04:15 GMT",
"version": "v2"
},
{
"created": "Fri, 11 Oct 2013 07:41:31 GMT",
"version": "v3"
}
] | 2013-11-05 | [
[
"Troshin",
"S. M.",
""
],
[
"Tyurin",
"N. E.",
""
]
] | We discuss the role of the impact--parameter dependent quantities. Their use along with the available experimental data on elastic scattering at the LHC could serve for an additional insight into the asymptotics. |
2404.01095 | Martin Bauer | Martin Bauer | Flavour bounds on axions, hidden photons and sterile neutrinos | Contribution to the 12th Workshop on the CKM Unitarity Triangle,
Santiago de Compostela, 18-22 September 2023, 8 pages | null | null | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Flavour-violating decays are some of the most sensitive probes for New
Physics with masses below the B meson threshold. In this talk I review the
sensitivity to axion-like particles, hidden photons and heavy neutral leptons
assuming minimal models where these are the only particle in addition to the
Standard Model, respectively.
| [
{
"created": "Mon, 1 Apr 2024 13:00:41 GMT",
"version": "v1"
}
] | 2024-04-02 | [
[
"Bauer",
"Martin",
""
]
] | Flavour-violating decays are some of the most sensitive probes for New Physics with masses below the B meson threshold. In this talk I review the sensitivity to axion-like particles, hidden photons and heavy neutral leptons assuming minimal models where these are the only particle in addition to the Standard Model, respectively. |
2312.07655 | Haotian Cao | Haotian Cao, Hai Tao Li, Zihao Mi | Bjorken $x$ weighted Energy-Energy Correlators from the Target
Fragmentation Region to the Current Fragmentation Region | 14 pages, 8 figures | null | null | null | hep-ph hep-ex nucl-ex | http://creativecommons.org/licenses/by/4.0/ | We present the complete spectrum for the Bjorken $x$ weighted Energy-Energy
Correlation in the deep inelastic scattering (DIS) process, from the target
fragmentation region to the current fragmentation region, in the Breit frame.
The corresponding collinear and transverse momentum-dependent logarithms are
resummed to all orders with the accuracy of NLL and N$^3$LL, respectively. And
the results in the full region are matched with ${\cal O}(\alpha^2_s)$
fixed-order calculation. The final numerical predictions are presented for both
EIC and CEBAF kinematics.
| [
{
"created": "Tue, 12 Dec 2023 19:00:01 GMT",
"version": "v1"
}
] | 2023-12-14 | [
[
"Cao",
"Haotian",
""
],
[
"Li",
"Hai Tao",
""
],
[
"Mi",
"Zihao",
""
]
] | We present the complete spectrum for the Bjorken $x$ weighted Energy-Energy Correlation in the deep inelastic scattering (DIS) process, from the target fragmentation region to the current fragmentation region, in the Breit frame. The corresponding collinear and transverse momentum-dependent logarithms are resummed to all orders with the accuracy of NLL and N$^3$LL, respectively. And the results in the full region are matched with ${\cal O}(\alpha^2_s)$ fixed-order calculation. The final numerical predictions are presented for both EIC and CEBAF kinematics. |
hep-ph/0110033 | Dima Kuzmenko | Yu.A.Simonov (ITEP, Moscow) | Mixing of meson, hybrid, and glueball states | LaTeX2e, 23 pages, 4 Postscript figures | Phys.Atom.Nucl.64:1876-1886,2001; Yad.Fiz.64:1959-1970,2001 | 10.1134/1.1414936 | null | hep-ph | null | The effective QCD Hamiltonian is constructed with the help of the background
perturbation theory, and relativistic Feynman--Schwinger path integrals for
Green's functions. The resulting spectrum displays mass gaps of the order of
one GeV, when additional valence gluon is added to the bound state. Mixing
between meson, hybrid, and glueball states is defined in two ways: through
generalized Green's functions and via modified Feynman diagram technic giving
similar answers. Results for mixing matrix elements are numerically not large
(around 0.1 GeV) and agree with earlier analytic estimates and lattice
simulations.
| [
{
"created": "Tue, 2 Oct 2001 12:38:49 GMT",
"version": "v1"
}
] | 2014-11-17 | [
[
"Simonov",
"Yu. A.",
"",
"ITEP, Moscow"
]
] | The effective QCD Hamiltonian is constructed with the help of the background perturbation theory, and relativistic Feynman--Schwinger path integrals for Green's functions. The resulting spectrum displays mass gaps of the order of one GeV, when additional valence gluon is added to the bound state. Mixing between meson, hybrid, and glueball states is defined in two ways: through generalized Green's functions and via modified Feynman diagram technic giving similar answers. Results for mixing matrix elements are numerically not large (around 0.1 GeV) and agree with earlier analytic estimates and lattice simulations. |
1810.11786 | Bogdan Povh | B. Povh, M. Rosina | Proton Spin in Deep Inelastic Scattering | 6 pages, 4 figures, Presented at the workshop on Diffraction and
Low-x, Reggio Calabria, Aug. 26-Sept. 1, 2018 | null | null | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | So far the analyses of the polarized structure functions of the proton and
neutron have been limited to the evaluation of their integrals and comparing
them to the prediction of the static quark model of the nucleon. We extended
our analysis to the x dependence of the polarized structure functions and
observe: the measured structure function excellently agrees with the prediction
of the static quark model for Bjorken $x>0.2$ and drops rapidly for $x<0.2$. It
is suggested that for Bjorken $x>0.2$ electrons get scattered on the undamaged
constituent quarks (alias valence quarks) denoted as quasi-elastic scattering
on the constituent quarks and for $x<0.2$ the constituent quarks fragment. In
the fragmentation strong interaction is involved which does not preserve the
polarization.
| [
{
"created": "Sun, 28 Oct 2018 09:37:44 GMT",
"version": "v1"
}
] | 2018-10-30 | [
[
"Povh",
"B.",
""
],
[
"Rosina",
"M.",
""
]
] | So far the analyses of the polarized structure functions of the proton and neutron have been limited to the evaluation of their integrals and comparing them to the prediction of the static quark model of the nucleon. We extended our analysis to the x dependence of the polarized structure functions and observe: the measured structure function excellently agrees with the prediction of the static quark model for Bjorken $x>0.2$ and drops rapidly for $x<0.2$. It is suggested that for Bjorken $x>0.2$ electrons get scattered on the undamaged constituent quarks (alias valence quarks) denoted as quasi-elastic scattering on the constituent quarks and for $x<0.2$ the constituent quarks fragment. In the fragmentation strong interaction is involved which does not preserve the polarization. |
2010.02373 | Juan Sebastian Alvarado | J. S. Alvarado, M. A. Bulla, D. G. Martinez, R. Martinez | Explaining muon $g-2$ anomaly in a non-universal $U(1)_{X}$ extended
SUSY theory | 42 pages, 26 figures, 3 tables | null | null | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A non-universal $U(1)_{X}$ extension to the Standard Model composed of two
scalar doublets and two scalar singlets together with three additional quark
singlets and two lepton singlets and three generations of right-handed and
Majorana neutrinos is made to explain lepton mass hierarchy, neutrino masses
via inverse seesaw mechanism and muon anomalous magnetic moment in an anomaly
free framework. In the present model, exotic and Standard Model particles
acquire mass thanks to vacuum expectation values at different scales, yet the
electron and the lightest neutrino are tree level massless but massive at
one-loop level. By considering a numerical exploration and under the constraint
of the Higgs mass, neutrino mass differences and PMNS matrix, it is found that
only contributions due to exotic neutrinos interacting with charged scalars are
relevant to muon $g-2$, though they are negative. Thus, the SUSY extension is
considered and it is found that muon $g-2$ can be explained by allowing
$U(1)_{X}$ vacuum expectation values to lie in the TeV scale thanks to SUSY
soft-breaking interactions for at least $\sim 10^{5}$ GeV masses. Thus, the
contribution due to exotic neutrinos interacting with $W$ gauge bosons is
positive and no longer negligible which added to all other contributions might
explain the anomaly.
| [
{
"created": "Mon, 5 Oct 2020 22:30:16 GMT",
"version": "v1"
}
] | 2020-10-07 | [
[
"Alvarado",
"J. S.",
""
],
[
"Bulla",
"M. A.",
""
],
[
"Martinez",
"D. G.",
""
],
[
"Martinez",
"R.",
""
]
] | A non-universal $U(1)_{X}$ extension to the Standard Model composed of two scalar doublets and two scalar singlets together with three additional quark singlets and two lepton singlets and three generations of right-handed and Majorana neutrinos is made to explain lepton mass hierarchy, neutrino masses via inverse seesaw mechanism and muon anomalous magnetic moment in an anomaly free framework. In the present model, exotic and Standard Model particles acquire mass thanks to vacuum expectation values at different scales, yet the electron and the lightest neutrino are tree level massless but massive at one-loop level. By considering a numerical exploration and under the constraint of the Higgs mass, neutrino mass differences and PMNS matrix, it is found that only contributions due to exotic neutrinos interacting with charged scalars are relevant to muon $g-2$, though they are negative. Thus, the SUSY extension is considered and it is found that muon $g-2$ can be explained by allowing $U(1)_{X}$ vacuum expectation values to lie in the TeV scale thanks to SUSY soft-breaking interactions for at least $\sim 10^{5}$ GeV masses. Thus, the contribution due to exotic neutrinos interacting with $W$ gauge bosons is positive and no longer negligible which added to all other contributions might explain the anomaly. |
hep-ph/0702107 | D. Delepine | David Delepine | CP violation in Semi-Leptonic $\tau$ decays | 8 pages, 3 figures, To appear in the proceedings of 6th Latin
American Symposium on High Energy Physics (VI-SILAFAE), Puerto Vallarta,
Mexico, November 1-8, 2006 | AIPConf.Proc.917:90-99,2007 | 10.1063/1.2751944 | null | hep-ph | null | We study CP violation in semi-leptonic $\tau$ decays and we determine the
conditions necessary to be able to define a observable CP asymmetry. We apply
these conditions in both models, the standard model for the electroweak
interactions and its supersymmetric extensions. In the first case, the leading
order contribution to the direct CP asymmetry in $\tau^{\pm} \to K^{\pm}\pi^0
\nu_{\tau}$ decay rates is evaluated. In the second case,we compute the SUSY
effective hamiltonian that describes the $|\Delta S|=1$ semileptonic decays of
tau leptons. We show that SUSY contributions may enhance the CP asymmetry of
$\tau \to K \pi \nu_{\tau}$ decays by several orders of magnitude compared to
the standard model expectations.
| [
{
"created": "Sat, 10 Feb 2007 23:59:35 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Delepine",
"David",
""
]
] | We study CP violation in semi-leptonic $\tau$ decays and we determine the conditions necessary to be able to define a observable CP asymmetry. We apply these conditions in both models, the standard model for the electroweak interactions and its supersymmetric extensions. In the first case, the leading order contribution to the direct CP asymmetry in $\tau^{\pm} \to K^{\pm}\pi^0 \nu_{\tau}$ decay rates is evaluated. In the second case,we compute the SUSY effective hamiltonian that describes the $|\Delta S|=1$ semileptonic decays of tau leptons. We show that SUSY contributions may enhance the CP asymmetry of $\tau \to K \pi \nu_{\tau}$ decays by several orders of magnitude compared to the standard model expectations. |
1104.3943 | Shinsuke Yoshida | Yuji Koike (Niigata U.) and Shinsuke Yoshida (Niigata U., Grad. Sch.
Sci. Tech.) | Probing the three-gluon correlation functions by the single spin
asymmetry in p^\uparrow p\to DX | 25 pages, 7 figures. Final version to appear in PRD. Some changes in
the section of numerical calculation included | Phys.Rev.D84:014026,2011 | 10.1103/PhysRevD.84.014026 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the single transverse-spin asymmetry for the inclusive open-charm
production in the pp-collision, p^\uparrow p\to DX, induced by the three-gluon
correlation functions in the polarized nucleon. We derive the corresponding
twist-3 cross section formula in the leading order with respect to the QCD
coupling constant. As in the case of the semi-inclusive deep inelastic
scattering, ep^\uparrow\to eDX, our result differs from the previous result in
the literature. We also derive a "master formula" which expresses the twist-3
cross section in terms of the gg\to c\bar{c} hard scattering cross section. We
present a model calculation of the asymmetry at the RHIC energy, demonstrating
the sensitivity of the asymmetry on the form of the three-gluon correlation
functions.
| [
{
"created": "Wed, 20 Apr 2011 06:01:36 GMT",
"version": "v1"
},
{
"created": "Mon, 4 Jul 2011 01:25:27 GMT",
"version": "v2"
}
] | 2011-08-09 | [
[
"Koike",
"Yuji",
"",
"Niigata U."
],
[
"Yoshida",
"Shinsuke",
"",
"Niigata U., Grad. Sch.\n Sci. Tech."
]
] | We study the single transverse-spin asymmetry for the inclusive open-charm production in the pp-collision, p^\uparrow p\to DX, induced by the three-gluon correlation functions in the polarized nucleon. We derive the corresponding twist-3 cross section formula in the leading order with respect to the QCD coupling constant. As in the case of the semi-inclusive deep inelastic scattering, ep^\uparrow\to eDX, our result differs from the previous result in the literature. We also derive a "master formula" which expresses the twist-3 cross section in terms of the gg\to c\bar{c} hard scattering cross section. We present a model calculation of the asymmetry at the RHIC energy, demonstrating the sensitivity of the asymmetry on the form of the three-gluon correlation functions. |
1708.04402 | Haitao Li | Hai Tao Li and German Valencia | CP violating anomalous couplings in $W$ jet production at the LHC | 14 pages, 10 figures, 2 tables; version accepted by PRD | Phys. Rev. D 96, 075014 (2017) | 10.1103/PhysRevD.96.075014 | CoEPP-MN-17-15 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | T-odd correlations in $Wj$ production at the LHC have been studied recently
as a way to measure a phase produced by QCD at NLO by Frederix et. al. That
study found that the induced asymmetry could be observed with 20 fb$^{-1}$ of 8
TeV data. These T-odd asymmetries can also be induced by CP violating new
physics interfering with the SM at LO. In this paper we study this possibility
using effective Lagrangians to describe the new physics. We find that the
leading contribution arises at dimension eight, and that it necessarily
introduces flavor changing neutral currents as well. We discuss the constraints
that can be placed on the flavor structure of the new physics operator from
studies of FCNC in kaon and B meson decays and then compare the T-odd
correlations in $Wj$ induced by CP violating new physics to those induced by
QCD at NLO. We quantify the level at which these couplings can be probed at the
LHC, and find that they will not affect a measurement of the NLO QCD phases.
| [
{
"created": "Tue, 15 Aug 2017 05:57:11 GMT",
"version": "v1"
},
{
"created": "Thu, 21 Sep 2017 03:27:26 GMT",
"version": "v2"
}
] | 2017-10-18 | [
[
"Li",
"Hai Tao",
""
],
[
"Valencia",
"German",
""
]
] | T-odd correlations in $Wj$ production at the LHC have been studied recently as a way to measure a phase produced by QCD at NLO by Frederix et. al. That study found that the induced asymmetry could be observed with 20 fb$^{-1}$ of 8 TeV data. These T-odd asymmetries can also be induced by CP violating new physics interfering with the SM at LO. In this paper we study this possibility using effective Lagrangians to describe the new physics. We find that the leading contribution arises at dimension eight, and that it necessarily introduces flavor changing neutral currents as well. We discuss the constraints that can be placed on the flavor structure of the new physics operator from studies of FCNC in kaon and B meson decays and then compare the T-odd correlations in $Wj$ induced by CP violating new physics to those induced by QCD at NLO. We quantify the level at which these couplings can be probed at the LHC, and find that they will not affect a measurement of the NLO QCD phases. |
hep-ph/0008299 | O. V. Kancheli | O. V. Kancheli | About the structure of the Froissart limit in QCD | 22 pages, 7 figures | null | null | null | hep-ph | null | The Froissart asymptotic behavior of cross-sections is usually considered in
a parton picture as corresponding to the collision of two almost black disks
filled with partons. In this article we mainly concentrate on the examination
of the local transparency of such F-disks. We discuss how is it possible to
guarantee the boost-invariance of the reciprocal transparency of two such
F-disks in a process of their collision, despite the fact that the mean area of
the overlapping of these F-disks at the same impact parameter is varying with
the Lorentz frame. We argue that on will always have such problems, if the
dominant interactions at all energies remain soft, but such a trouble can be
probably avoided if the mean parton virtualities grow with energies. This last
is natural in QCD, and we use the qualitative generalization of BFKL approach
to estimate the distribution of hard partons with various virtualities inside a
F-disk. As a result, the quasiclassical partonic wave function corresponding to
the F-limit can be approximately represented by the system of enclosed
parton-gluon disks with a growing virtuality and blackness. With the increase
of energy the new disks with larger virtualities are created in the middle of
the previous disks, and then they expand with the same transverse velocity.
| [
{
"created": "Tue, 29 Aug 2000 08:53:58 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Kancheli",
"O. V.",
""
]
] | The Froissart asymptotic behavior of cross-sections is usually considered in a parton picture as corresponding to the collision of two almost black disks filled with partons. In this article we mainly concentrate on the examination of the local transparency of such F-disks. We discuss how is it possible to guarantee the boost-invariance of the reciprocal transparency of two such F-disks in a process of their collision, despite the fact that the mean area of the overlapping of these F-disks at the same impact parameter is varying with the Lorentz frame. We argue that on will always have such problems, if the dominant interactions at all energies remain soft, but such a trouble can be probably avoided if the mean parton virtualities grow with energies. This last is natural in QCD, and we use the qualitative generalization of BFKL approach to estimate the distribution of hard partons with various virtualities inside a F-disk. As a result, the quasiclassical partonic wave function corresponding to the F-limit can be approximately represented by the system of enclosed parton-gluon disks with a growing virtuality and blackness. With the increase of energy the new disks with larger virtualities are created in the middle of the previous disks, and then they expand with the same transverse velocity. |
hep-ph/0004082 | Susumu Koretune | Susumu Koretune | Soft pions at high energy and its phenomenological implications | 6 pages,LaTex,1 figures,Talk given at "Workshop on Light-Cone QCD and
Nonperturbative Hadron Physics",Adelaide,Australia,December 11-22,1999,to
appear in the proceedings | null | null | null | hep-ph nucl-th | null | The soft pion theorem in the inclusive reaction at high energy applied to the
current induced reaction is explained briefly. A characteristic aspect of this
theorem is the charge asymmetry produced by the pole terms in the soft pion
limit. The pion charge asymmetry in the central region in the
target-virtual-photon center of the mass (CM) frame of the semi-inclusive
electroproduction and the contribution to the Gottfried sum are illustrated as
examples.
| [
{
"created": "Sun, 9 Apr 2000 06:00:45 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Koretune",
"Susumu",
""
]
] | The soft pion theorem in the inclusive reaction at high energy applied to the current induced reaction is explained briefly. A characteristic aspect of this theorem is the charge asymmetry produced by the pole terms in the soft pion limit. The pion charge asymmetry in the central region in the target-virtual-photon center of the mass (CM) frame of the semi-inclusive electroproduction and the contribution to the Gottfried sum are illustrated as examples. |
hep-ph/9208209 | John Collins | J.C. Collins and F.V. Tkachov | Breakdown of Dimensional Regularization in the Sudakov Problem | 12 pages + 3 figures (not included), LaTeX | Phys.Lett. B294 (1992) 403-411 | 10.1016/0370-2693(92)91541-G | FERMILAB-PUB-92/164-T; PSU/TH/109 | hep-ph | null | An explicit example is presented (a one-loop triangle graph) where
dimensional regularization fails to regulate the infra-red singularities that
emerge at intermediate steps of studying large-$Q^2$ Sudakov factorization. The
mathematical nature of the phenomenon is explained within the framework of the
theory of the $As$-operation.
| [
{
"created": "Wed, 5 Aug 1992 20:44:51 GMT",
"version": "v1"
}
] | 2009-10-22 | [
[
"Collins",
"J. C.",
""
],
[
"Tkachov",
"F. V.",
""
]
] | An explicit example is presented (a one-loop triangle graph) where dimensional regularization fails to regulate the infra-red singularities that emerge at intermediate steps of studying large-$Q^2$ Sudakov factorization. The mathematical nature of the phenomenon is explained within the framework of the theory of the $As$-operation. |
hep-ph/0610121 | Lianyi He | Lianyi He, Meng Jin and Pengfei Zhuang | Neutral Color Superconductivity Including Inhomogeneous Phases at Finite
Temperature | 12 pages, 7 figures. v2: references added, accepted for publication
in PRD. V3: Calculation of the neutral LOFF state clarified, typos corrected. | Phys.Rev.D75:036003,2007 | 10.1103/PhysRevD.75.036003 | null | hep-ph cond-mat.supr-con nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We investigate neutral quark matter with homogeneous and inhomogeneous color
condensates at finite temperature in the frame of an extended NJL model. By
calculating the Meissner masses squared and gap susceptibility, the uniform
color superconductor is stable only in a temperature window close to the
critical temperature and becomes unstable against LOFF phase, mixed phase and
gluonic phase at low temperatures. The introduction of the inhomogeneous phases
leads to disappearance of the strange intermediate temperature 2SC/g2SC and
changes the phase diagram of neutral dense quark matter significantly.
| [
{
"created": "Wed, 11 Oct 2006 07:13:17 GMT",
"version": "v1"
},
{
"created": "Tue, 23 Jan 2007 09:13:11 GMT",
"version": "v2"
},
{
"created": "Mon, 3 May 2010 14:18:39 GMT",
"version": "v3"
}
] | 2010-05-07 | [
[
"He",
"Lianyi",
""
],
[
"Jin",
"Meng",
""
],
[
"Zhuang",
"Pengfei",
""
]
] | We investigate neutral quark matter with homogeneous and inhomogeneous color condensates at finite temperature in the frame of an extended NJL model. By calculating the Meissner masses squared and gap susceptibility, the uniform color superconductor is stable only in a temperature window close to the critical temperature and becomes unstable against LOFF phase, mixed phase and gluonic phase at low temperatures. The introduction of the inhomogeneous phases leads to disappearance of the strange intermediate temperature 2SC/g2SC and changes the phase diagram of neutral dense quark matter significantly. |
1602.08310 | Selym Villalba-Chavez Dr. | Ibrahim Akal, Reinhold Egger, Carsten M\"uller, Selym
Villalba-Ch\'avez | Low-dimensional approach to pair production in an oscillating electric
field: Application to bandgap graphene layers | 9 pages, 3 figures | Phys. Rev. D 93, 116006 (2016) | 10.1103/PhysRevD.93.116006 | null | hep-ph cond-mat.mes-hall | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The production of particle-antiparticle pairs from the quantum field
theoretic ground state in the presence of an external electric field is
studied. Starting with the quantum kinetic Boltzmann-Vlasov equation in
four-dimensional spacetime, we obtain the corresponding equations in lower
dimensionalities by way of spatial compactification. Our outcomes in
$2+1$-dimensions are applied to bandgap graphene layers, where the charge
carriers have the particular property of behaving like light massive Dirac
fermions. We calculate the single-particle distribution function for the case
of an electric field oscillating in time and show that the creation of
particle-hole pairs in this condensed matter system closely resembles
electron-positron pair production by the Schwinger effect.
| [
{
"created": "Fri, 26 Feb 2016 13:17:40 GMT",
"version": "v1"
},
{
"created": "Fri, 23 Dec 2016 14:14:45 GMT",
"version": "v2"
}
] | 2016-12-26 | [
[
"Akal",
"Ibrahim",
""
],
[
"Egger",
"Reinhold",
""
],
[
"Müller",
"Carsten",
""
],
[
"Villalba-Chávez",
"Selym",
""
]
] | The production of particle-antiparticle pairs from the quantum field theoretic ground state in the presence of an external electric field is studied. Starting with the quantum kinetic Boltzmann-Vlasov equation in four-dimensional spacetime, we obtain the corresponding equations in lower dimensionalities by way of spatial compactification. Our outcomes in $2+1$-dimensions are applied to bandgap graphene layers, where the charge carriers have the particular property of behaving like light massive Dirac fermions. We calculate the single-particle distribution function for the case of an electric field oscillating in time and show that the creation of particle-hole pairs in this condensed matter system closely resembles electron-positron pair production by the Schwinger effect. |
hep-ph/9905364 | Uma Mahanta | Uma Mahanta | The effect of R parity violating couplings on e^-e^-->{\tilde e}_L
{\tilde e}_R | Plain tex version, 7 pages, no figures | Phys.Rev. D61 (2000) 035006 | 10.1103/PhysRevD.61.035006 | MRI-PHY/P990514 | hep-ph | null | In this work we study the effect of R parity breaking couplings on the
process e^-e^-->{\tilde e}_L{\tilde e}_R. We find that an e^-e^- linear
collider opearting at a center of mass energy of 500 Gev with a luminosity of
50 fb^{-1} will be able to probe the coupling
[\lambda_{211}+\lambda_{311}]^{1/2} down to .045 for a bino mass of 100 Gev and
selectron mass of 200 Gev. This would improve the current bound on it by a
factor of 3.5. More improved bounds can be obtained from precision measurement
of \sigma_{LR}-\sigma_{RR} which reduces the MSSM background.
| [
{
"created": "Mon, 17 May 1999 11:17:47 GMT",
"version": "v1"
}
] | 2009-10-31 | [
[
"Mahanta",
"Uma",
""
]
] | In this work we study the effect of R parity breaking couplings on the process e^-e^-->{\tilde e}_L{\tilde e}_R. We find that an e^-e^- linear collider opearting at a center of mass energy of 500 Gev with a luminosity of 50 fb^{-1} will be able to probe the coupling [\lambda_{211}+\lambda_{311}]^{1/2} down to .045 for a bino mass of 100 Gev and selectron mass of 200 Gev. This would improve the current bound on it by a factor of 3.5. More improved bounds can be obtained from precision measurement of \sigma_{LR}-\sigma_{RR} which reduces the MSSM background. |
0901.3337 | Christopher Kolda | Brian Dudley and Christopher Kolda | Constraining the Charged Higgs Mass in the MSSM: A Low-Energy Approach | 19 pages, 5 figures. High-resolution figures available on request | null | null | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We examine the current lower bound on the charged Higgs boson mass in the
Minimal Supersymmetric Standard Model. By applying direct search constraints on
the neutral Higgs bosons and other supersymmetric states, as well as a number
of indirect constraints (b -> s gamma, B_s -> mu mu, B -> tau nu, B -> D tau
nu), we find that it is possible to push the charged Higgs boson mass as low as
140 GeV. We work in a completely low-energy approach with no assumptions about
scalar mass unification, examining two of the most popular limits for neutral
Higgs boson searches: the Max-Mixing and No-Mixing scenarios. While both
scenarios allow light charged Higgs bosons, they do so for completely different
ranges of tan(beta). In either case, one expects light top squarks to accompany
a light charged Higgs.
| [
{
"created": "Wed, 21 Jan 2009 19:16:36 GMT",
"version": "v1"
}
] | 2009-01-22 | [
[
"Dudley",
"Brian",
""
],
[
"Kolda",
"Christopher",
""
]
] | We examine the current lower bound on the charged Higgs boson mass in the Minimal Supersymmetric Standard Model. By applying direct search constraints on the neutral Higgs bosons and other supersymmetric states, as well as a number of indirect constraints (b -> s gamma, B_s -> mu mu, B -> tau nu, B -> D tau nu), we find that it is possible to push the charged Higgs boson mass as low as 140 GeV. We work in a completely low-energy approach with no assumptions about scalar mass unification, examining two of the most popular limits for neutral Higgs boson searches: the Max-Mixing and No-Mixing scenarios. While both scenarios allow light charged Higgs bosons, they do so for completely different ranges of tan(beta). In either case, one expects light top squarks to accompany a light charged Higgs. |
hep-ph/9908226 | Alexei Nefediev | Yu.S.Kalashnikova, A.V.Nefediev, A.V.Volodin (ITEP, Moscow) | Hamiltonian approach to the bound state problem in QCD_2 | 9 pages, LaTeX2e | Phys.Atom.Nucl. 63 (2000) 1623-1628; Yad.Fiz. 63 (2000) 1710-1715 | 10.1134/1.1312896 | null | hep-ph | null | Bosonization of the two-dimensional QCD in the large N_C limit is performed
in the framework of Hamiltonian approach in the Coulomb gauge. The generalized
Bogoliubov transformation is applied to diagonalize the Hamiltonian in the
bosonic sector of the theory, and the composite operators creating/annihilating
bosons are obtained in terms of dressed quark operators. The bound state
equation is reconstructed as a result of the generalized Bogoliubov
transformation, and the form of its massless solution, chiral pion, is found
explicitly. Chiral properties of the theory are discussed.
| [
{
"created": "Tue, 3 Aug 1999 09:14:36 GMT",
"version": "v1"
}
] | 2009-10-31 | [
[
"Kalashnikova",
"Yu. S.",
"",
"ITEP, Moscow"
],
[
"Nefediev",
"A. V.",
"",
"ITEP, Moscow"
],
[
"Volodin",
"A. V.",
"",
"ITEP, Moscow"
]
] | Bosonization of the two-dimensional QCD in the large N_C limit is performed in the framework of Hamiltonian approach in the Coulomb gauge. The generalized Bogoliubov transformation is applied to diagonalize the Hamiltonian in the bosonic sector of the theory, and the composite operators creating/annihilating bosons are obtained in terms of dressed quark operators. The bound state equation is reconstructed as a result of the generalized Bogoliubov transformation, and the form of its massless solution, chiral pion, is found explicitly. Chiral properties of the theory are discussed. |
1011.1404 | Florian Plentinger | Frank F. Deppisch, Florian Plentinger, Gerhart Seidl | Lepton Flavor Violation in Complex SUSY Seesaw Models with Nearly
Tribimaximal Mixing | 22 pages, 17 figures. Version to be published in JHEP | JHEP 1101:004,2011 | 10.1007/JHEP01(2011)004 | MAN/HEP/2010/20, SISSA 41/2010/EP | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We survey the lepton flavor violation branching ratios Br(mu->e,gamma),
Br(tau->mu,gamma), and Br(tau->e,gamma) in mSUGRA for a broad class of lepton
mass matrix textures that give nearly tribimaximal lepton mixing. Small
neutrino masses are generated by the type-I seesaw mechanism with
non-degenerate right-handed neutrino masses. The textures exhibit a
hierarchical mass pattern and can be understood from flavor models giving rise
to large leptonic mixing. We study the branching ratios for the most general
CP-violating forms of the textures. It is demonstrated that the branching
ratios can be enhanced by 2-3 orders of magnitude as compared to the
CP-conserving case. The branching ratios exhibit, however, a strong dependence
on the choice of the phases in the Lagrangian which affects the significance of
flavor models. In particular, for general CP-phases, the lepton flavor
violating rates appear to be essentially uncorrelated with the possible high-
and low-energy lepton mixing parameters, such as the reactor angle.
| [
{
"created": "Fri, 5 Nov 2010 14:19:00 GMT",
"version": "v1"
},
{
"created": "Sun, 2 Jan 2011 18:01:19 GMT",
"version": "v2"
}
] | 2011-04-20 | [
[
"Deppisch",
"Frank F.",
""
],
[
"Plentinger",
"Florian",
""
],
[
"Seidl",
"Gerhart",
""
]
] | We survey the lepton flavor violation branching ratios Br(mu->e,gamma), Br(tau->mu,gamma), and Br(tau->e,gamma) in mSUGRA for a broad class of lepton mass matrix textures that give nearly tribimaximal lepton mixing. Small neutrino masses are generated by the type-I seesaw mechanism with non-degenerate right-handed neutrino masses. The textures exhibit a hierarchical mass pattern and can be understood from flavor models giving rise to large leptonic mixing. We study the branching ratios for the most general CP-violating forms of the textures. It is demonstrated that the branching ratios can be enhanced by 2-3 orders of magnitude as compared to the CP-conserving case. The branching ratios exhibit, however, a strong dependence on the choice of the phases in the Lagrangian which affects the significance of flavor models. In particular, for general CP-phases, the lepton flavor violating rates appear to be essentially uncorrelated with the possible high- and low-energy lepton mixing parameters, such as the reactor angle. |
hep-ph/0602231 | Zuo-Hong Li | Zuo-Hong Li, Zhong-Qian Su and Jian-Ying Cui | Importance of Higher Twist Effects to Understand Charmed
Color-Suppressed $B$ Decays | Latex, 11 pages, 1 figure | null | null | null | hep-ph | null | Working within the framework of the QCD light cone sum rules (LCSR), we
compute and discuss the nonfactorizable higher twist effect in $\bar{B}^0\to
D^{*0}\pi^0$ to make an all-around examination of its role in the charmed
color-suppressed B decays. Analogously to the case of $\bar{B}^0\to
D^{0}\pi^0$, such effect turns out to be of the same strong phase as the
factorizable amplitude, and modifies constructively the magnitude by order
$(40-90)%$ so that the effective coefficient $a_2^{f}=C_1+C_2/3$ receives a
positive correction comparable numerically with it. Nonleading as the soft
effect in question is, our findings for it, along with the previous LCSR
analyses of $\bar{B}^0\to D^{0}\pi^0$, are suggestive of the dominance of soft
exchanges in these charmed color suppressed B decays. Also, the emphases are
put on importance of understanding intensively various related higher twist and
transverse momentum effects to interpret the data on $B \to
D^{0(*0)}(\pi^0,\eta,\eta'),J/\psi K^{(*)}$.
| [
{
"created": "Sat, 25 Feb 2006 15:46:15 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Li",
"Zuo-Hong",
""
],
[
"Su",
"Zhong-Qian",
""
],
[
"Cui",
"Jian-Ying",
""
]
] | Working within the framework of the QCD light cone sum rules (LCSR), we compute and discuss the nonfactorizable higher twist effect in $\bar{B}^0\to D^{*0}\pi^0$ to make an all-around examination of its role in the charmed color-suppressed B decays. Analogously to the case of $\bar{B}^0\to D^{0}\pi^0$, such effect turns out to be of the same strong phase as the factorizable amplitude, and modifies constructively the magnitude by order $(40-90)%$ so that the effective coefficient $a_2^{f}=C_1+C_2/3$ receives a positive correction comparable numerically with it. Nonleading as the soft effect in question is, our findings for it, along with the previous LCSR analyses of $\bar{B}^0\to D^{0}\pi^0$, are suggestive of the dominance of soft exchanges in these charmed color suppressed B decays. Also, the emphases are put on importance of understanding intensively various related higher twist and transverse momentum effects to interpret the data on $B \to D^{0(*0)}(\pi^0,\eta,\eta'),J/\psi K^{(*)}$. |
2209.12947 | Pascal Anastasopoulos | Pascal Anastasopoulos, Kunio Kaneta, Elias Kiritsis, Yann Mambrini | Anomalous and axial Z' contributions to g-2 | 45 pages, 8 plots, jheppub style, tikz package used, v2 - various
comments/clarifications and citations added | null | 10.1007/JHEP02(2023)051 | CCTP-2022-2, ITCP-2022/5 | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the effects of an anomalous Z' boson on the anomalous magnetic
moment of the muon (g-2), and especially the impact of its axial coupling. We
mainly evaluate the negative contribution to (g-2) of such couplings at
one-loop and look at the anomalous couplings generated at two loops. We find
areas of the parameter space, where the anomalous contribution becomes
comparable and even dominant compared to the one-loop contribution. We show
that in such cases, the cutoff of the theory is sufficiently low, so that new
charged fermions can be found in the next round of collider experiments. We
comment on the realization of such a context in string theory orientifolds.
| [
{
"created": "Mon, 26 Sep 2022 18:31:39 GMT",
"version": "v1"
},
{
"created": "Fri, 13 Jan 2023 11:45:56 GMT",
"version": "v2"
}
] | 2023-03-01 | [
[
"Anastasopoulos",
"Pascal",
""
],
[
"Kaneta",
"Kunio",
""
],
[
"Kiritsis",
"Elias",
""
],
[
"Mambrini",
"Yann",
""
]
] | We study the effects of an anomalous Z' boson on the anomalous magnetic moment of the muon (g-2), and especially the impact of its axial coupling. We mainly evaluate the negative contribution to (g-2) of such couplings at one-loop and look at the anomalous couplings generated at two loops. We find areas of the parameter space, where the anomalous contribution becomes comparable and even dominant compared to the one-loop contribution. We show that in such cases, the cutoff of the theory is sufficiently low, so that new charged fermions can be found in the next round of collider experiments. We comment on the realization of such a context in string theory orientifolds. |
hep-ph/9506320 | T. J. Fields | T.J. Fields, K.S. Gupta, and J.P. Vary | Renormalization of Effective Hamiltonians | 10 pages, ReVTeX | Mod.Phys.Lett. A11 (1996) 2233-2240 | 10.1142/S0217732396002228 | ISU-NP-94-15 | hep-ph | null | We introduce a way of implementing Wilson renormalization within the context
of the theory of effective Hamiltonians. Our renormalization scheme involves
manipulations at the level of the generalized $G$--matrix and is independent of
any specific kinematics. We show how to calculate the beta function within this
context and exhibit our method using simple scale--invariant quantum mechanical
systems.
| [
{
"created": "Tue, 13 Jun 1995 21:05:36 GMT",
"version": "v1"
}
] | 2015-06-25 | [
[
"Fields",
"T. J.",
""
],
[
"Gupta",
"K. S.",
""
],
[
"Vary",
"J. P.",
""
]
] | We introduce a way of implementing Wilson renormalization within the context of the theory of effective Hamiltonians. Our renormalization scheme involves manipulations at the level of the generalized $G$--matrix and is independent of any specific kinematics. We show how to calculate the beta function within this context and exhibit our method using simple scale--invariant quantum mechanical systems. |
2302.03326 | Shota Kikuchi | Shota Kikuchi, Tatsuo Kobayashi, Kaito Nasu, Shohei Takada, Hikaru
Uchida | Quark mass hierarchies and CP violation in $A_4\times A_4\times A_4$
modular symmetric flavor models | 42 pages, 3 figures | null | 10.1007/JHEP07(2023)134 | EPHOU-23-004 | hep-ph | http://creativecommons.org/licenses/by/4.0/ | We study $A_4 \times A_4 \times A_4$ modular symmetric flavor models to
realize quark mass hierarchies and mixing angles without fine-tuning. Mass
matrices are written in terms of modular forms. At modular fixed points $\tau =
i\infty$ and $\omega$, $A_4$ is broken to $Z_3$ residual symmetry. When the
modulus $\tau$ is deviated from the fixed points, modular forms show
hierarchies depending on their residual charges. Thus, we obtain hierarchical
structures in mass matrices. Since we begin with $A_4\times A_4 \times A_4$,
the residual symmetry is $Z_3 \times Z_3 \times Z_3$ which can generate
sufficient hierarchies to realize quark mass ratios and absolute values of the
CKM matrix $|V_{\textrm{CKM}}|$ without fine-tuning. Furthermore, CP violation
is studied. We present necessary conditions for CP violation caused by the
value of $\tau$. We also show possibilities to realize observed values of the
Jarlskog invariant $J_{\textrm{CP}}$, quark mass ratios and CKM matrix
$|V_{\textrm{CKM}}|$ simultaneously, if $\mathcal{O}(10)$ adjustments in
coefficients of Yukawa couplings are allowed.
| [
{
"created": "Tue, 7 Feb 2023 09:07:22 GMT",
"version": "v1"
},
{
"created": "Wed, 15 Feb 2023 10:05:04 GMT",
"version": "v2"
},
{
"created": "Mon, 3 Jul 2023 01:40:17 GMT",
"version": "v3"
}
] | 2023-08-02 | [
[
"Kikuchi",
"Shota",
""
],
[
"Kobayashi",
"Tatsuo",
""
],
[
"Nasu",
"Kaito",
""
],
[
"Takada",
"Shohei",
""
],
[
"Uchida",
"Hikaru",
""
]
] | We study $A_4 \times A_4 \times A_4$ modular symmetric flavor models to realize quark mass hierarchies and mixing angles without fine-tuning. Mass matrices are written in terms of modular forms. At modular fixed points $\tau = i\infty$ and $\omega$, $A_4$ is broken to $Z_3$ residual symmetry. When the modulus $\tau$ is deviated from the fixed points, modular forms show hierarchies depending on their residual charges. Thus, we obtain hierarchical structures in mass matrices. Since we begin with $A_4\times A_4 \times A_4$, the residual symmetry is $Z_3 \times Z_3 \times Z_3$ which can generate sufficient hierarchies to realize quark mass ratios and absolute values of the CKM matrix $|V_{\textrm{CKM}}|$ without fine-tuning. Furthermore, CP violation is studied. We present necessary conditions for CP violation caused by the value of $\tau$. We also show possibilities to realize observed values of the Jarlskog invariant $J_{\textrm{CP}}$, quark mass ratios and CKM matrix $|V_{\textrm{CKM}}|$ simultaneously, if $\mathcal{O}(10)$ adjustments in coefficients of Yukawa couplings are allowed. |
1507.06671 | Dean Robinson | Zoltan Ligeti, Dean J. Robinson | Towards more precise determinations of the CKM phase $\beta$ | 5 pages, 1 figure, published version | Phys. Rev. Lett. 115, 251801 (2015) | 10.1103/PhysRevLett.115.251801 | null | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We derive a new flavor symmetry relation for the determination of the weak
phase $\beta=\phi_1$ from time-dependent CP asymmetries and $B \to J/\psi P$
decay rates. In this relation, the contributions to $\sin2\beta$ proportional
to $V_{ub}$ are parametrically suppressed compared to the contributions in the
$B \to J/\psi K^0$ time-dependent CP asymmetry alone. This relation uses only
$SU(3)$ flavor symmetry, and does not require further diagrammatic assumptions.
The current data either fluctuate at the $2\sigma$ level from expectations, or
may hint at effects of unexpected magnitude from contributions proportional to
$V_{ub}$ or from isospin breaking.
| [
{
"created": "Thu, 23 Jul 2015 20:26:35 GMT",
"version": "v1"
},
{
"created": "Mon, 30 Nov 2015 00:38:44 GMT",
"version": "v2"
}
] | 2015-12-23 | [
[
"Ligeti",
"Zoltan",
""
],
[
"Robinson",
"Dean J.",
""
]
] | We derive a new flavor symmetry relation for the determination of the weak phase $\beta=\phi_1$ from time-dependent CP asymmetries and $B \to J/\psi P$ decay rates. In this relation, the contributions to $\sin2\beta$ proportional to $V_{ub}$ are parametrically suppressed compared to the contributions in the $B \to J/\psi K^0$ time-dependent CP asymmetry alone. This relation uses only $SU(3)$ flavor symmetry, and does not require further diagrammatic assumptions. The current data either fluctuate at the $2\sigma$ level from expectations, or may hint at effects of unexpected magnitude from contributions proportional to $V_{ub}$ or from isospin breaking. |
0708.0578 | Edmond Berger | Edmond L Berger, Jian-Wei Qiu, and Ricardo A. Rodriguez-Pedraza | Transverse momentum dependence of the angular distribution of the
Drell-Yan process | 18 pages, 4 figures; typos corrected, references updated, a few
clarifications recommended by the referee. Paper accepted for publication in
Physical Review D | Phys.Rev.D76:074006,2007 | 10.1103/PhysRevD.76.074006 | Argonne report ANL-HEP-PR-07-53 | hep-ph hep-ex | null | We calculate the transverse momentum Q_{\perp} dependence of the helicity
structure functions for the hadroproduction of a massive pair of leptons with
pair invariant mass Q. These structure functions determine the angular
distribution of the leptons in the pair rest frame. Unphysical behavior in the
region Q_{\perp} --> 0 is seen in the results of calculations done at
fixed-order in QCD perturbation theory. We use current conservation to
demonstrate that the unphysical inverse-power and \ln(Q/Q_{\perp}) logarithmic
divergences in three of the four independent helicity structure functions share
the same origin as the divergent terms in fixed-order calculations of the
angular-integrated cross section. We show that the resummation of these
divergences to all orders in the strong coupling strength \alpha_s can be
reduced to the solved problem of the resummation of the divergences in the
angular-integrated cross section, resulting in well-behaved predictions in the
small Q_{\perp} region. Among other results, we show the resummed part of the
helicity structure functions preserves the Lam-Tung relation between the
longitudinal and double spin-flip structure functions as a function of
Q_{\perp} to all orders in \alpha_s.
| [
{
"created": "Fri, 3 Aug 2007 20:09:33 GMT",
"version": "v1"
},
{
"created": "Sat, 29 Sep 2007 22:19:42 GMT",
"version": "v2"
}
] | 2008-11-26 | [
[
"Berger",
"Edmond L",
""
],
[
"Qiu",
"Jian-Wei",
""
],
[
"Rodriguez-Pedraza",
"Ricardo A.",
""
]
] | We calculate the transverse momentum Q_{\perp} dependence of the helicity structure functions for the hadroproduction of a massive pair of leptons with pair invariant mass Q. These structure functions determine the angular distribution of the leptons in the pair rest frame. Unphysical behavior in the region Q_{\perp} --> 0 is seen in the results of calculations done at fixed-order in QCD perturbation theory. We use current conservation to demonstrate that the unphysical inverse-power and \ln(Q/Q_{\perp}) logarithmic divergences in three of the four independent helicity structure functions share the same origin as the divergent terms in fixed-order calculations of the angular-integrated cross section. We show that the resummation of these divergences to all orders in the strong coupling strength \alpha_s can be reduced to the solved problem of the resummation of the divergences in the angular-integrated cross section, resulting in well-behaved predictions in the small Q_{\perp} region. Among other results, we show the resummed part of the helicity structure functions preserves the Lam-Tung relation between the longitudinal and double spin-flip structure functions as a function of Q_{\perp} to all orders in \alpha_s. |
1302.3401 | Michal Malinsky | Stefano Bertolini, Luca Di Luzio, Michal Malinsky | Light color octet scalars in the minimal SO(10) grand unification | 17 pages, 4 figures, 5 tables; minor corrections & references added
in v2; published version | null | 10.1103/PhysRevD.87.085020 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We analyze the relation between the present (and foreseen) bounds on matter
stability and the presence of TeV-scale color octet scalar states in
nonsupersymmetric SO(10) grand unification with one adjoint Higgs
representation triggering the symmetry breaking. This scenario, discarded long
ago due to tree-level tachyonic instabilities appearing in all
phenomenologically viable breaking patterns, has been recently revived at the
quantum level. By including the relevant two-loop corrections we find a tight
correlation between the octet mass and the unification scale which either
requires a light color octet scalar within the reach of the LHC or,
alternatively, a proton lifetime accessible to the forthcoming megaton-scale
facilities.
| [
{
"created": "Thu, 14 Feb 2013 13:56:48 GMT",
"version": "v1"
},
{
"created": "Wed, 10 Apr 2013 08:13:15 GMT",
"version": "v2"
}
] | 2015-06-15 | [
[
"Bertolini",
"Stefano",
""
],
[
"Di Luzio",
"Luca",
""
],
[
"Malinsky",
"Michal",
""
]
] | We analyze the relation between the present (and foreseen) bounds on matter stability and the presence of TeV-scale color octet scalar states in nonsupersymmetric SO(10) grand unification with one adjoint Higgs representation triggering the symmetry breaking. This scenario, discarded long ago due to tree-level tachyonic instabilities appearing in all phenomenologically viable breaking patterns, has been recently revived at the quantum level. By including the relevant two-loop corrections we find a tight correlation between the octet mass and the unification scale which either requires a light color octet scalar within the reach of the LHC or, alternatively, a proton lifetime accessible to the forthcoming megaton-scale facilities. |
hep-ph/0408204 | C. Hanhart | C. Hanhart | Comment on 'Photoproduction of $\eta$--Mesic ${^3}$He' | Extended version of a comment sent to Phys. Rev. Lett | Phys.Rev.Lett.94:049101,2005 | 10.1103/PhysRevLett.94.049101 | FZJ-IKP(TH)-2004-12 | hep-ph | null | In a recent paper by the TAPS collaboration \cite{exp} a first measurement of
a bound system of an $\eta$ meson and a ${^3}$He nucleus was reported. In this
comment we critically reexamine the interpretation of the data and show that
the data prefers a solution where there is no bound state present. Given the
low statistics of the measurement, however, it does not exclude the existence
of a bound state.
| [
{
"created": "Wed, 18 Aug 2004 09:47:23 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Hanhart",
"C.",
""
]
] | In a recent paper by the TAPS collaboration \cite{exp} a first measurement of a bound system of an $\eta$ meson and a ${^3}$He nucleus was reported. In this comment we critically reexamine the interpretation of the data and show that the data prefers a solution where there is no bound state present. Given the low statistics of the measurement, however, it does not exclude the existence of a bound state. |
2005.11761 | Pablo Sanchez Puertas | Pere Masjuan, Pablo Roig, Pablo Sanchez-Puertas | The interplay of transverse degrees of freedom and axial-vector mesons
with short-distance constraints in g-2 | 11 pages+references; major revision including a new model; version
accepted for publication in Journal of Physics G | J. Phys. G: Nucl. Part. Phys. 49 015002 (2022) | 10.1088/1361-6471/ac3892 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We revisit well-known short-distance constraints relating the hadronic
light-by light Green's function to the $\langle VVA \rangle$ one, that have
been a subject of debate over the past years in the context of the muon
$(g-2)$. Specifically, we identify a relation among the longitudinal and
transverse degrees of freedom that is enforced by the axial anomaly that, by
contrast, has not received attention in the past. Such relation allows, among
other things, to overcome the problem of basis ambiguities when describing
axial-vector mesons transition form factors, but further applications are
discussed as well, with special focus on the role of axial-vector mesons in the
HLbL contribution to the muon $(g-2)$. Our results should also contribute to a
better understanding of the, so far, controversial interplay among
short-distance constraints with longitudinal and transverse degrees of freedom,
such as axial-vector mesons. This is key to confront the theoretical and
experimental result for the muon $(g-2)$ that, currently, exhibits a
$4.2\sigma$ tension.
| [
{
"created": "Sun, 24 May 2020 14:49:50 GMT",
"version": "v1"
},
{
"created": "Tue, 2 Mar 2021 11:41:07 GMT",
"version": "v2"
},
{
"created": "Mon, 21 Jun 2021 18:05:21 GMT",
"version": "v3"
},
{
"created": "Thu, 4 Nov 2021 07:17:48 GMT",
"version": "v4"
}
] | 2021-12-09 | [
[
"Masjuan",
"Pere",
""
],
[
"Roig",
"Pablo",
""
],
[
"Sanchez-Puertas",
"Pablo",
""
]
] | We revisit well-known short-distance constraints relating the hadronic light-by light Green's function to the $\langle VVA \rangle$ one, that have been a subject of debate over the past years in the context of the muon $(g-2)$. Specifically, we identify a relation among the longitudinal and transverse degrees of freedom that is enforced by the axial anomaly that, by contrast, has not received attention in the past. Such relation allows, among other things, to overcome the problem of basis ambiguities when describing axial-vector mesons transition form factors, but further applications are discussed as well, with special focus on the role of axial-vector mesons in the HLbL contribution to the muon $(g-2)$. Our results should also contribute to a better understanding of the, so far, controversial interplay among short-distance constraints with longitudinal and transverse degrees of freedom, such as axial-vector mesons. This is key to confront the theoretical and experimental result for the muon $(g-2)$ that, currently, exhibits a $4.2\sigma$ tension. |
hep-ph/0203011 | Leona Kershaw | R.D. McKeown and M.J. Ramsey-Musolf (Kellogg Radiation Lab, Caltech) | The Nucleon's Mirror Image: Revealing the Strange and Unexpected | 15 pages, 3 figures | Mod.Phys.Lett. A18 (2003) 75-84 | 10.1142/S0217732303010016 | OAP-754 | hep-ph | null | A remarkably successful program of parity-violating electron scattering
experiments is providing new insight into the structure of the nucleon.
Measurement of the vector form factors enables a definitive study of potential
strange quark-antiquark contributions to the electromagnetic structure such as
the magnetic moment and charge distribution. Recent experimental results have
already indicated that effects of strangeness are much smaller than
theoretically expected. In addition, the neutral axial form factor appears to
display substantial corrections as one might expect from an anapole effect.
| [
{
"created": "Fri, 1 Mar 2002 20:00:15 GMT",
"version": "v1"
}
] | 2009-11-07 | [
[
"McKeown",
"R. D.",
"",
"Kellogg Radiation Lab, Caltech"
],
[
"Ramsey-Musolf",
"M. J.",
"",
"Kellogg Radiation Lab, Caltech"
]
] | A remarkably successful program of parity-violating electron scattering experiments is providing new insight into the structure of the nucleon. Measurement of the vector form factors enables a definitive study of potential strange quark-antiquark contributions to the electromagnetic structure such as the magnetic moment and charge distribution. Recent experimental results have already indicated that effects of strangeness are much smaller than theoretically expected. In addition, the neutral axial form factor appears to display substantial corrections as one might expect from an anapole effect. |
1711.01485 | Pol Bernard Gossiaux | P.B. Gossiaux, J. Aichelin, M. Nahrgang, V. Ozvenchuk and K. Werner | Coupled dynamics of heavy and light flavor flow harmonics from EPOSHQ | SQM 2017 proceedings | null | 10.1051/epjconf/201817118004 | null | hep-ph nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We pursue the study of event by event correlations between low-mass particles
and heavy mesons flow harmonics in ultrarelativistic heavy ion collisions and
clarify some ambiguities found in one of our previous work.
| [
{
"created": "Sat, 4 Nov 2017 19:58:15 GMT",
"version": "v1"
}
] | 2018-03-14 | [
[
"Gossiaux",
"P. B.",
""
],
[
"Aichelin",
"J.",
""
],
[
"Nahrgang",
"M.",
""
],
[
"Ozvenchuk",
"V.",
""
],
[
"Werner",
"K.",
""
]
] | We pursue the study of event by event correlations between low-mass particles and heavy mesons flow harmonics in ultrarelativistic heavy ion collisions and clarify some ambiguities found in one of our previous work. |
1003.1138 | Hovhannes Grigoryan | Hovhannes R. Grigoryan, Paul M. Hohler, Mikhail A. Stephanov | Towards the Gravity Dual of Quarkonium in the Strongly Coupled QCD
Plasma | 13 pages, 9 figures | Phys.Rev.D82:026005,2010 | 10.1103/PhysRevD.82.026005 | null | hep-ph hep-lat hep-th nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We build a "bottom-up" holographic model of charmonium by matching the
essential spectral data. We argue that this data must include not only the
masses but also the decay constants of the J/psi and psi' mesons. Relative to
the "soft-wall" models for light mesons, such a matching requires two new
features in the holographic potential: an overall upward shift as well as a
narrow "dip" near the holographic boundary. We calculate the spectral function
as well as the position of the complex singularities (quasinormal frequencies)
of the retarded correlator of the charm current at finite temperatures. We
further extend this analysis by showing that the residues associated with these
singularities are given by the boundary derivative of the appropriately
normalized quasinormal mode. We find that the "melting" of the J/psi spectral
peak occurs at a temperature of about 540 MeV, or 2.8 T_c, in good agreement
with lattice results.
| [
{
"created": "Fri, 5 Mar 2010 20:55:27 GMT",
"version": "v1"
}
] | 2011-02-22 | [
[
"Grigoryan",
"Hovhannes R.",
""
],
[
"Hohler",
"Paul M.",
""
],
[
"Stephanov",
"Mikhail A.",
""
]
] | We build a "bottom-up" holographic model of charmonium by matching the essential spectral data. We argue that this data must include not only the masses but also the decay constants of the J/psi and psi' mesons. Relative to the "soft-wall" models for light mesons, such a matching requires two new features in the holographic potential: an overall upward shift as well as a narrow "dip" near the holographic boundary. We calculate the spectral function as well as the position of the complex singularities (quasinormal frequencies) of the retarded correlator of the charm current at finite temperatures. We further extend this analysis by showing that the residues associated with these singularities are given by the boundary derivative of the appropriately normalized quasinormal mode. We find that the "melting" of the J/psi spectral peak occurs at a temperature of about 540 MeV, or 2.8 T_c, in good agreement with lattice results. |
1410.6278 | Hongshi Zong | Jian-Feng Li, Feng-Yao Hou, Zhu-Fang Cui, Hong-Tao Feng, Yu Jiang,
Hong-Shi Zong | Influence of gauge boson mass on the staggered spin susceptibility | 7 pages, 5 figures. arXiv admin note: text overlap with
arXiv:1306.3013 | null | 10.1103/PhysRevD.90.073013 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Based on the study of the linear response of the fermion propagator in the
presence of an external scalar field, we calculate the staggered spin
susceptibility in the low energy limit in the framework of the Dyson-Schwinger
approach. We analyze the effect of a finite gauge boson mass on the staggered
spin susceptibility in both Nambu phase and Wigner phase. It is found that the
gauge boson mass suppresses the staggered spin susceptibility in Wigner phase.
In addition, we try to give an explanation for why the antiferromagnetic spin
correlation increases when the doping is lowered.
| [
{
"created": "Thu, 23 Oct 2014 08:04:52 GMT",
"version": "v1"
}
] | 2015-06-23 | [
[
"Li",
"Jian-Feng",
""
],
[
"Hou",
"Feng-Yao",
""
],
[
"Cui",
"Zhu-Fang",
""
],
[
"Feng",
"Hong-Tao",
""
],
[
"Jiang",
"Yu",
""
],
[
"Zong",
"Hong-Shi",
""
]
] | Based on the study of the linear response of the fermion propagator in the presence of an external scalar field, we calculate the staggered spin susceptibility in the low energy limit in the framework of the Dyson-Schwinger approach. We analyze the effect of a finite gauge boson mass on the staggered spin susceptibility in both Nambu phase and Wigner phase. It is found that the gauge boson mass suppresses the staggered spin susceptibility in Wigner phase. In addition, we try to give an explanation for why the antiferromagnetic spin correlation increases when the doping is lowered. |
hep-ph/0210183 | Ahmed Ali | A. Ali (DESY) | Next-to-leading Order Calculations of the Radiative and Semileptonic
Rare B Decays in the Standard Model and Comparison with Data | 7 pages, 1 figure; uses espcrc2.sty, to appear in the Proceedings of
the 31st International Conference on High Energy Physics (ICHEP 2002),
Amsterdam, The Netherlands, 24-31 July 2002 | null | 10.1016/S0920-5632(03)90632-3 | CERN-TH/2002-284 | hep-ph hep-ex | null | We review some selected rare B decays calculated in next-to-leading order
accuracy in the Standard Model (SM). These include the radiative decays $B \to
(X_s,K^*,\rho)\gamma$ and the semileptonic decays $B \to (X_s,K,K^*) \ell^+
\ell^-$, for which new data from the BABAR and BELLE collaborations have been
presented at this conference. SM is in agreement with the current measurements
within the theoretical and experimental errors. The impact of rare B-decays on
the CKM phenomenology is quantitatively discussed.
| [
{
"created": "Fri, 11 Oct 2002 14:30:22 GMT",
"version": "v1"
}
] | 2009-11-07 | [
[
"Ali",
"A.",
"",
"DESY"
]
] | We review some selected rare B decays calculated in next-to-leading order accuracy in the Standard Model (SM). These include the radiative decays $B \to (X_s,K^*,\rho)\gamma$ and the semileptonic decays $B \to (X_s,K,K^*) \ell^+ \ell^-$, for which new data from the BABAR and BELLE collaborations have been presented at this conference. SM is in agreement with the current measurements within the theoretical and experimental errors. The impact of rare B-decays on the CKM phenomenology is quantitatively discussed. |
2107.07275 | Joy Ganguly | Joy Ganguly and Raghavendra Srikanth Hundi | Lepton and quark mixing patterns with generalized CP transformations | 36 pages, 1 figure, 3 tables; apart from adding 2 sections, added
more content and clarifications; published in Chinese Physics C | null | 10.1088/1674-1137/ac763c | null | hep-ph | http://creativecommons.org/licenses/by/4.0/ | In this work, we have modified a scenario, originally proposed by Grimus and
Lavoura, in order to obtain maximal values for atmospheric mixing angle and CP
violating Dirac phase of the lepton sector. To achieve this, we have employed
CP and some discrete symmetries in a type II seesaw model. In order to make
predictions about neutrino mass ordering and the smallness of the reactor
angle, we have obtained some conditions on the elements of the neutrino mass
matrix of our model. Finally, within the framework of our model, we have
studied quark masses and mixing pattern.
| [
{
"created": "Thu, 15 Jul 2021 12:03:10 GMT",
"version": "v1"
},
{
"created": "Mon, 26 Sep 2022 15:30:29 GMT",
"version": "v2"
}
] | 2022-10-05 | [
[
"Ganguly",
"Joy",
""
],
[
"Hundi",
"Raghavendra Srikanth",
""
]
] | In this work, we have modified a scenario, originally proposed by Grimus and Lavoura, in order to obtain maximal values for atmospheric mixing angle and CP violating Dirac phase of the lepton sector. To achieve this, we have employed CP and some discrete symmetries in a type II seesaw model. In order to make predictions about neutrino mass ordering and the smallness of the reactor angle, we have obtained some conditions on the elements of the neutrino mass matrix of our model. Finally, within the framework of our model, we have studied quark masses and mixing pattern. |
0807.1968 | Takahiro Kubota | Masataka Fukugita and Takahiro Kubota | Empirically Consistent Electroweak Radiative Corrections with the
Two-Higgs Doublet Model | 11 pages, 4 figures | null | null | OU-HET 607 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The electroweak radiative correction, which turned out to be marginal within
the standard electroweak model having the minimal Higgs sector in view of the
present experimental information, fits well the experiment when the Higgs
sector is extended to have two Higgs doublets. We predict the range where the
charged and CP odd Higgs boson masses would lie, taking the two CP even neutral
Higgs boson masses to be degenerate which makes the analysis in multiparameter
space feasible. It is shown that the mass of neutral Higgs doublet boson can
arbitrarily be large consistently with the $W$ mass, if the charged Higgs boson
is present and it's mass lies in some appropriate ranges.
| [
{
"created": "Sat, 12 Jul 2008 11:30:11 GMT",
"version": "v1"
}
] | 2008-07-15 | [
[
"Fukugita",
"Masataka",
""
],
[
"Kubota",
"Takahiro",
""
]
] | The electroweak radiative correction, which turned out to be marginal within the standard electroweak model having the minimal Higgs sector in view of the present experimental information, fits well the experiment when the Higgs sector is extended to have two Higgs doublets. We predict the range where the charged and CP odd Higgs boson masses would lie, taking the two CP even neutral Higgs boson masses to be degenerate which makes the analysis in multiparameter space feasible. It is shown that the mass of neutral Higgs doublet boson can arbitrarily be large consistently with the $W$ mass, if the charged Higgs boson is present and it's mass lies in some appropriate ranges. |
hep-ph/0101258 | Wit | K. Fialkowski and R. Wit | Charge fluctuations in a final state with QGP | 5 pages | Europhys.Lett. 55 (2001) 184-187 | 10.1209/epl/i2001-00392-7 | null | hep-ph | null | Charge fluctuations as a possible signal of quark - gluon plasma (QGP) were
recently suggested. A short summary of comments presented on this subject is
given and supplemented by a discussion of the coexistence of pions produced
"directly" and through a QGP phase. Such a coexistence may obscure the expected
plasma signal similarly to the effects considered in the comments mentioned
above.
| [
{
"created": "Tue, 23 Jan 2001 12:59:34 GMT",
"version": "v1"
}
] | 2009-11-07 | [
[
"Fialkowski",
"K.",
""
],
[
"Wit",
"R.",
""
]
] | Charge fluctuations as a possible signal of quark - gluon plasma (QGP) were recently suggested. A short summary of comments presented on this subject is given and supplemented by a discussion of the coexistence of pions produced "directly" and through a QGP phase. Such a coexistence may obscure the expected plasma signal similarly to the effects considered in the comments mentioned above. |
2212.06215 | Spencer Chang | Spencer Chang, Miranda Chen, Da Liu and Markus A. Luty | Primary Observables for Indirect Searches at Colliders | 46 pages, 2 figures, 13 tables. Final published version in JHEP | null | 10.1007/JHEP07(2023)030 | null | hep-ph hep-ex hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We consider the complete set of observables for collider searches for
indirect effects of new heavy physics. They consist of $SU(3)_{\rm C}\times
U(1)_{\rm EM}$ invariant interaction terms/operators that parameterize
deviations from the Standard Model. We show that, under very general
assumptions, the leading deviations from the Standard Model are given by a
finite number of `primary' operators, with the remaining operators given by
`Mandelstam descendants' whose effects are suppressed by powers of Mandelstam
variables divided by the mass scale $M$ of the heavy physics. We explicitly
determine all 3 and 4-point primary operators relevant for Higgs signals at
colliders by using the correspondence between on-shell amplitudes and
independent operators. We give a detailed discussion of the methods used to
obtain this result, including a new analytical method for determining the
independent operators. The results are checked using the Hilbert series that
counts independent operators. We also give a rough sketch of the phenomenology,
including unitarity bounds on the interaction strengths and rough estimates of
their importance for Higgs decays at the HL-LHC. These results motivate further
exploration of Higgs decays to $Z\bar{f}f$, $W\bar{f}f'$, $\gamma \bar{f}f$,
and $Z\gamma\gamma$.
| [
{
"created": "Mon, 12 Dec 2022 19:57:33 GMT",
"version": "v1"
},
{
"created": "Tue, 11 Jul 2023 22:46:56 GMT",
"version": "v2"
}
] | 2023-07-13 | [
[
"Chang",
"Spencer",
""
],
[
"Chen",
"Miranda",
""
],
[
"Liu",
"Da",
""
],
[
"Luty",
"Markus A.",
""
]
] | We consider the complete set of observables for collider searches for indirect effects of new heavy physics. They consist of $SU(3)_{\rm C}\times U(1)_{\rm EM}$ invariant interaction terms/operators that parameterize deviations from the Standard Model. We show that, under very general assumptions, the leading deviations from the Standard Model are given by a finite number of `primary' operators, with the remaining operators given by `Mandelstam descendants' whose effects are suppressed by powers of Mandelstam variables divided by the mass scale $M$ of the heavy physics. We explicitly determine all 3 and 4-point primary operators relevant for Higgs signals at colliders by using the correspondence between on-shell amplitudes and independent operators. We give a detailed discussion of the methods used to obtain this result, including a new analytical method for determining the independent operators. The results are checked using the Hilbert series that counts independent operators. We also give a rough sketch of the phenomenology, including unitarity bounds on the interaction strengths and rough estimates of their importance for Higgs decays at the HL-LHC. These results motivate further exploration of Higgs decays to $Z\bar{f}f$, $W\bar{f}f'$, $\gamma \bar{f}f$, and $Z\gamma\gamma$. |
hep-ph/0609033 | Alexander Mitov | A. Mitov, S. Moch and A. Vogt | NNLO splitting and coefficient functions with time-like kinematics | Presented by A.M. at Loops and Legs in Quantum Field Theory, 23-28
April 2006, Eisenach, Germany | null | 10.1016/j.nuclphysbps.2006.09.027 | DESY 06-150 | hep-ph | null | We discuss recent results on the three-loop (next-to-next-to-leading order,
NNLO) time-like splitting functions of QCD and the two-loop (NNLO) coefficient
functions in one-particle inclusive e+e- annihilation. These results form the
basis for extracting fragmentation functions for light and heavy flavors with
NNLO accuracy that will be needed at the LHC and ILC. The two-loop calculations
have been performed in Mellin space based on a new method, the main features of
which we also describe briefly.
| [
{
"created": "Mon, 4 Sep 2006 19:59:10 GMT",
"version": "v1"
},
{
"created": "Mon, 4 Sep 2006 20:11:14 GMT",
"version": "v2"
}
] | 2009-11-11 | [
[
"Mitov",
"A.",
""
],
[
"Moch",
"S.",
""
],
[
"Vogt",
"A.",
""
]
] | We discuss recent results on the three-loop (next-to-next-to-leading order, NNLO) time-like splitting functions of QCD and the two-loop (NNLO) coefficient functions in one-particle inclusive e+e- annihilation. These results form the basis for extracting fragmentation functions for light and heavy flavors with NNLO accuracy that will be needed at the LHC and ILC. The two-loop calculations have been performed in Mellin space based on a new method, the main features of which we also describe briefly. |
1104.1901 | Michael Paraskevas | M. Paraskevas and K. Tamvakis | Hierarchical neutrino masses and mixing in non minimal-SU(5) | 12 pages, 1 figure, 1 table. Captions inserted, 2 sentences for
clarification added, 2 references added | Phys.Rev.D84:013010,2011 | 10.1103/PhysRevD.84.013010 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We consider the problem of neutrino masses and mixing within the framework of
a non-minimal supersymmetric SU(5) model extended by adding a set of 1,24
chiral superfields accommodating three right-handed neutrinos. A Type I+III
see-saw mechanism can then be realized giving rise to a hierarchical mass
spectrum for the light neutrinos of the form m_3> m_2>> m_1 consistent with
present data. The extra colored states are pushed to the unification scale by
proton stability constraints, while the intermediate see-saw energy scale and
the unification scale are maintained in phenomenologically acceptable ranges.
We also examine the issue of large neutrino mixing hierarchy \theta_{23}>
\theta_{12}>> \theta_{13} in the above framework of hierarchical neutrino
masses.
| [
{
"created": "Mon, 11 Apr 2011 10:50:18 GMT",
"version": "v1"
},
{
"created": "Mon, 25 Jul 2011 12:40:15 GMT",
"version": "v2"
}
] | 2011-08-09 | [
[
"Paraskevas",
"M.",
""
],
[
"Tamvakis",
"K.",
""
]
] | We consider the problem of neutrino masses and mixing within the framework of a non-minimal supersymmetric SU(5) model extended by adding a set of 1,24 chiral superfields accommodating three right-handed neutrinos. A Type I+III see-saw mechanism can then be realized giving rise to a hierarchical mass spectrum for the light neutrinos of the form m_3> m_2>> m_1 consistent with present data. The extra colored states are pushed to the unification scale by proton stability constraints, while the intermediate see-saw energy scale and the unification scale are maintained in phenomenologically acceptable ranges. We also examine the issue of large neutrino mixing hierarchy \theta_{23}> \theta_{12}>> \theta_{13} in the above framework of hierarchical neutrino masses. |
1701.03738 | Jun He Prof. | Jun He | Nucleon resonances $N(1875)$ and $N(2100)$ as strange partners of LHCb
pentaquarks | 8 pages, 1 figures. Published version | Phys. Rev. D 95, 074031 (2017) | 10.1103/PhysRevD.95.074031 | null | hep-ph hep-ex nucl-ex nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this work, we investigate the possibility of interpreting two nucleon
resonances, the $N(1875)$ and the $N(2100)$, as hadronic molecular states from
the $\Sigma^*K$ and $\Sigma K^*$ interactions, respectively. With the help of
effective Lagrangians in which coupling constants are determined by the SU(3)
symmetry, the $\Sigma^*K$ and $\Sigma K^*$ interactions are described by the
vector-meson and pseudoscalar-meson exchanges. With the one-boson-exchange
potential obtained, bound states from the $\Sigma^*K$ and $\Sigma K^*$
interactions are searched for in a quasipotential Bethe-Saltpeter equation
approach. A bound state with quantum number $I(J^P)=1/2(3/2^-)$ is produced
from the $\Sigma^*K$ interaction, which can be identified as the $N(1875)$
listed in PDG. It can be seen as a strange partner of the LHCb pentaquark
$P_c(4380)$ with the same quantum numbers in the molecular state picture. The
$\Sigma K^*$ interaction also produces a bound state with quantum number
$I(J^P)=1/2(3/2^-)$, which is related to experimentally observed $N(2100)$ in
the $\phi$ photoproduction. Our results suggest that the $N(2120)$ observed in
the $K\Lambda(1520)$ photoproduction and the $N(2100)$ observed in the $\phi$
photoproduction have different origins. The former is a conventional
three-quark state while the latter is a $\Sigma K^*$ molecular state, which can
be seen as a strange partner of the $P_c(4450)$ with different spin parity.
| [
{
"created": "Fri, 13 Jan 2017 17:21:21 GMT",
"version": "v1"
},
{
"created": "Tue, 17 Jan 2017 09:54:26 GMT",
"version": "v2"
},
{
"created": "Wed, 19 Apr 2017 02:19:57 GMT",
"version": "v3"
}
] | 2017-05-03 | [
[
"He",
"Jun",
""
]
] | In this work, we investigate the possibility of interpreting two nucleon resonances, the $N(1875)$ and the $N(2100)$, as hadronic molecular states from the $\Sigma^*K$ and $\Sigma K^*$ interactions, respectively. With the help of effective Lagrangians in which coupling constants are determined by the SU(3) symmetry, the $\Sigma^*K$ and $\Sigma K^*$ interactions are described by the vector-meson and pseudoscalar-meson exchanges. With the one-boson-exchange potential obtained, bound states from the $\Sigma^*K$ and $\Sigma K^*$ interactions are searched for in a quasipotential Bethe-Saltpeter equation approach. A bound state with quantum number $I(J^P)=1/2(3/2^-)$ is produced from the $\Sigma^*K$ interaction, which can be identified as the $N(1875)$ listed in PDG. It can be seen as a strange partner of the LHCb pentaquark $P_c(4380)$ with the same quantum numbers in the molecular state picture. The $\Sigma K^*$ interaction also produces a bound state with quantum number $I(J^P)=1/2(3/2^-)$, which is related to experimentally observed $N(2100)$ in the $\phi$ photoproduction. Our results suggest that the $N(2120)$ observed in the $K\Lambda(1520)$ photoproduction and the $N(2100)$ observed in the $\phi$ photoproduction have different origins. The former is a conventional three-quark state while the latter is a $\Sigma K^*$ molecular state, which can be seen as a strange partner of the $P_c(4450)$ with different spin parity. |
1512.04397 | Daniele Barducci | D. Barducci, S. De Curtis, S. Moretti and G.M. Pruna | Composite Higgs models and $t\bar t$ production at future $e^+e^-$
colliders | Proceeding for LFC15: physics prospects for Linear and other Future
Colliders after the discovery of the Higgs, 7-11 September 2015, Trento
(Italy) | Frascati Phys.Ser. 61 (2016) 89 | null | PSI-PR-15-11, LAPTH-Conf-067/15 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The study of the top quark properties will be an integral part of any
particle physics activity at future leptonic colliders. In this proceeding we
discuss the possibility of testing composite Higgs scenarios at $e^+e^-$
prototypes through deviations from the Standard Model predictions in $t\bar t$
production observables for various centre of mass energies, ranging from 370
GeV up to 1 TeV. This proceedings draws from Ref. arXiv:1504.05407
| [
{
"created": "Mon, 14 Dec 2015 16:32:18 GMT",
"version": "v1"
}
] | 2017-05-11 | [
[
"Barducci",
"D.",
""
],
[
"De Curtis",
"S.",
""
],
[
"Moretti",
"S.",
""
],
[
"Pruna",
"G. M.",
""
]
] | The study of the top quark properties will be an integral part of any particle physics activity at future leptonic colliders. In this proceeding we discuss the possibility of testing composite Higgs scenarios at $e^+e^-$ prototypes through deviations from the Standard Model predictions in $t\bar t$ production observables for various centre of mass energies, ranging from 370 GeV up to 1 TeV. This proceedings draws from Ref. arXiv:1504.05407 |
1503.04982 | V. M. Mostepanenko | G. L. Klimchitskaya and V. M. Mostepanenko | Improved constraints on the coupling constants of axion-like particles
to nucleons from recent Casimir-less experiment | 6 pages, 2 figures; minor changes have been made in accordance to the
version accepted for publication in Eur. Phys. J. C | Eur. Phys. J. C, v.75, N4, 164-(1-6) (2015) | 10.1140/epjc/s10052-015-3401-1 | null | hep-ph astro-ph.HE quant-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We obtain improved constraints on the coupling constants of axion-like
particles to nucleons from a recently performed Casimir-less experiment. For
this purpose, the differential force between a Au-coated sphere and either Au
or Si sectors of a rotating disc, arising due to two-axion exchange, is
calculated. Over a wide region of axion masses from 1.7 meV to 0.9 eV the
obtained constraints are stronger up to a factor of 60 than the previously
known ones following from the Cavendish-type experiment and measurements of the
effective Casimir pressure.
| [
{
"created": "Tue, 17 Mar 2015 10:40:10 GMT",
"version": "v1"
},
{
"created": "Thu, 9 Apr 2015 08:46:23 GMT",
"version": "v2"
}
] | 2015-04-28 | [
[
"Klimchitskaya",
"G. L.",
""
],
[
"Mostepanenko",
"V. M.",
""
]
] | We obtain improved constraints on the coupling constants of axion-like particles to nucleons from a recently performed Casimir-less experiment. For this purpose, the differential force between a Au-coated sphere and either Au or Si sectors of a rotating disc, arising due to two-axion exchange, is calculated. Over a wide region of axion masses from 1.7 meV to 0.9 eV the obtained constraints are stronger up to a factor of 60 than the previously known ones following from the Cavendish-type experiment and measurements of the effective Casimir pressure. |
2304.13969 | Guo-Liang Yu | Jie Lu, Guo-Liang Yu, Zhi-Gang Wang | The strong vertices of charmed mesons $D$, $D^{*}$ and charmonia
$J/\psi$, $\eta_{c}$ | null | Eur. Phys. J. A (2023) 59:195 | 10.1140/epja/s10050-023-01115-3 | null | hep-ph | http://creativecommons.org/licenses/by/4.0/ | In this work, the strong coupling constants of the vertices $DDJ/\psi$,
$DD^{*}J/\psi$, $D^{*}D^{*}J/\psi$, $DD^{*}\eta_{c}$ and $D^{*}D^{*}\eta_{c}$
are calculated within the framework of the QCD sum rules. For each vertex, we
analyze the momentum dependence of the coupling constants by considering all
possible off-shell cases. In these analyses, we consider the contributions of
the vacuum condensate terms $\langle\overline{q}q\rangle$,
$\langle\overline{q}g_{s}\sigma Gq\rangle$, $\langle g_{s}^{2}G^{2}\rangle$,
$\langle f^{3}G^{3}\rangle$ and $\langle\overline{q}q\rangle\langle
g_{s}^{2}G^{2}\rangle$. Then, the momentum dependent coupling constants are
fitted into analytical functions $g(Q^2)$ and are extrapolated into time-like
regions. The values of strong coupling constants are obtained by using on-shell
conditions of the intermediate mesons($Q^2=-m^2$). The final results are as
follows, $g_{DDJ/\psi}=5.01^{+0.58}_{-0.16}$,
$g_{DD^{*}J/\psi}=3.55^{+0.20}_{-0.21}$GeV$^{-1}$,
$g_{D^{*}D^{*}J/\psi}=5.10^{+0.59}_{-0.43}$,
$g_{DD^{*}\eta_{c}}=3.68^{+0.39}_{-0.11}$ and
$g_{D^{*}D^{*}\eta_{c}}=4.87^{+0.42}_{-0.40}$GeV$^{-1}$.
| [
{
"created": "Thu, 27 Apr 2023 06:14:22 GMT",
"version": "v1"
},
{
"created": "Sat, 6 May 2023 12:52:21 GMT",
"version": "v2"
},
{
"created": "Thu, 27 Jul 2023 05:03:12 GMT",
"version": "v3"
},
{
"created": "Mon, 9 Oct 2023 03:01:17 GMT",
"version": "v4"
},
{
"created": "Tue, 10 Oct 2023 04:07:15 GMT",
"version": "v5"
}
] | 2023-10-11 | [
[
"Lu",
"Jie",
""
],
[
"Yu",
"Guo-Liang",
""
],
[
"Wang",
"Zhi-Gang",
""
]
] | In this work, the strong coupling constants of the vertices $DDJ/\psi$, $DD^{*}J/\psi$, $D^{*}D^{*}J/\psi$, $DD^{*}\eta_{c}$ and $D^{*}D^{*}\eta_{c}$ are calculated within the framework of the QCD sum rules. For each vertex, we analyze the momentum dependence of the coupling constants by considering all possible off-shell cases. In these analyses, we consider the contributions of the vacuum condensate terms $\langle\overline{q}q\rangle$, $\langle\overline{q}g_{s}\sigma Gq\rangle$, $\langle g_{s}^{2}G^{2}\rangle$, $\langle f^{3}G^{3}\rangle$ and $\langle\overline{q}q\rangle\langle g_{s}^{2}G^{2}\rangle$. Then, the momentum dependent coupling constants are fitted into analytical functions $g(Q^2)$ and are extrapolated into time-like regions. The values of strong coupling constants are obtained by using on-shell conditions of the intermediate mesons($Q^2=-m^2$). The final results are as follows, $g_{DDJ/\psi}=5.01^{+0.58}_{-0.16}$, $g_{DD^{*}J/\psi}=3.55^{+0.20}_{-0.21}$GeV$^{-1}$, $g_{D^{*}D^{*}J/\psi}=5.10^{+0.59}_{-0.43}$, $g_{DD^{*}\eta_{c}}=3.68^{+0.39}_{-0.11}$ and $g_{D^{*}D^{*}\eta_{c}}=4.87^{+0.42}_{-0.40}$GeV$^{-1}$. |
hep-ph/9908422 | Yoshimasa Kurihara | Y. Kurihara (1), J. Fujimoto (1), T. Ishikawa (1), Y. Shimizu (1), T.
Munehisa (2) ((1) KEK, (2) Yamanashi-univ.) | Event generator for the single- and double-photon emission associated
with neutrino pair-production | 30 pages, 12 figures | Comput.Phys.Commun. 136 (2001) 250-268 | 10.1016/S0010-4655(00)00254-X | KEK-CP-082 | hep-ph | null | A new event generator is proposed for two processes e+e- -> nu nu-bar gamma
and e+e- -> nu nu-bar gamma gamma where nu includes all the neutrino species.
The exact matrix elements of single- and double-photon emission, generated by
the GRACE system, are convoluted with the QED parton shower(QEDPS) to deal with
the initial state radiations(ISR). It is pointed out that a careful treatment
is required to avoid the double counting of the radiative photons between the
matrix elements and the ISR part. A detailed comparison of grc-nu-nu-gamma with
the O(alpha) calculations and other similar Monte Carlo generators is discussed
on the total cross section and on various distributions. It is also examined
how the possible effects of the anomalous triple-gauge-boson couplings can be
observed.
| [
{
"created": "Fri, 20 Aug 1999 03:01:00 GMT",
"version": "v1"
}
] | 2009-10-31 | [
[
"Kurihara",
"Y.",
"",
"KEK"
],
[
"Fujimoto",
"J.",
"",
"KEK"
],
[
"Ishikawa",
"T.",
"",
"KEK"
],
[
"Shimizu",
"Y.",
"",
"KEK"
],
[
"Munehisa",
"T.",
"",
"Yamanashi-univ"
]
] | A new event generator is proposed for two processes e+e- -> nu nu-bar gamma and e+e- -> nu nu-bar gamma gamma where nu includes all the neutrino species. The exact matrix elements of single- and double-photon emission, generated by the GRACE system, are convoluted with the QED parton shower(QEDPS) to deal with the initial state radiations(ISR). It is pointed out that a careful treatment is required to avoid the double counting of the radiative photons between the matrix elements and the ISR part. A detailed comparison of grc-nu-nu-gamma with the O(alpha) calculations and other similar Monte Carlo generators is discussed on the total cross section and on various distributions. It is also examined how the possible effects of the anomalous triple-gauge-boson couplings can be observed. |
1809.10135 | Jan Heisig | Mathias Garny, Jan Heisig | Interplay of super-WIMP and freeze-in production of dark matter | 9 pages + references, 2 figures; v2: title changed, matches journal
version | Phys. Rev. D 98, 095031 (2018) | 10.1103/PhysRevD.98.095031 | TUM-HEP 1166/18, TTK-18-39 | hep-ph astro-ph.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Non-thermalized dark matter is a cosmologically valid alternative to the
paradigm of weakly interacting massive particles. For dark matter belonging to
a $Z_2$-odd sector that contains in addition a thermalized mediator particle,
dark matter production proceeds in general via both the freeze-in and superWIMP
mechanism. We highlight their interplay and emphasize the connection to
long-lived particles at colliders. For the explicit example of a colored
t-channel mediator model we map out the entire accessible parameter space,
cornered by bounds from the LHC, big bang nucleosynthesis and Lyman-alpha
forest observations, respectively. We discuss prospects for the HL- and HE-LHC.
| [
{
"created": "Wed, 26 Sep 2018 17:46:34 GMT",
"version": "v1"
},
{
"created": "Wed, 12 Dec 2018 19:00:02 GMT",
"version": "v2"
}
] | 2018-12-14 | [
[
"Garny",
"Mathias",
""
],
[
"Heisig",
"Jan",
""
]
] | Non-thermalized dark matter is a cosmologically valid alternative to the paradigm of weakly interacting massive particles. For dark matter belonging to a $Z_2$-odd sector that contains in addition a thermalized mediator particle, dark matter production proceeds in general via both the freeze-in and superWIMP mechanism. We highlight their interplay and emphasize the connection to long-lived particles at colliders. For the explicit example of a colored t-channel mediator model we map out the entire accessible parameter space, cornered by bounds from the LHC, big bang nucleosynthesis and Lyman-alpha forest observations, respectively. We discuss prospects for the HL- and HE-LHC. |
2012.07209 | Lianbao Jia | Lian-Bao Jia, Tong Li | Interpretation of XENON1T excess with MeV boosted dark matter | 6 pages, 4 figures, the version accepted by CPC | null | 10.1088/1674-1137/ac6d51 | null | hep-ph astro-ph.CO | http://creativecommons.org/licenses/by-nc-nd/4.0/ | The XENON1T excess of keV electron recoil events may be induced by the
scattering of electrons and long-lived particles with MeV mass and high-speed.
We consider a tangible model composed of two scalar MeV dark matter (DM)
particles $S_A$ and $S_B$ to interpret the XENON1T keV excess via boosted
$S_B$. A small mass splitting $m_{S_A}-m_{S_B}>0$ is introduced and the boosted
$S_B$ can be produced by the dark annihilation process of $S_A S_A^\dagger \to
\phi \to S_B S_B^\dagger$ via a resonant scalar $\phi$. The $S_B-$electron
scattering is intermediated by a vector boson $X$. Although the constraints
from BBN, CMB and low-energy experiments set the $X-$mediated $S_B-$electron
scattering cross section to be $\lesssim 10^{-35} \mathrm{cm}^2$, the MeV scale
DM with a resonance enhanced dark annihilation today can still provide enough
boosted $S_B$ and induce the XENON1T keV excess. The relic density of $S_B$ is
significantly reduced by the $s$-wave process of $S_B S_B^\dagger \to X X$
which is allowed by the constraints from CMB and 21-cm absorption. A very small
relic fraction of $S_B$ is compatible with the stringent bounds on un-boosted
$S_B$-electron scattering in DM direct detection and the $S_A$-electron
scattering is also allowed.
| [
{
"created": "Mon, 14 Dec 2020 01:52:06 GMT",
"version": "v1"
},
{
"created": "Sat, 30 Apr 2022 07:50:01 GMT",
"version": "v2"
}
] | 2022-08-10 | [
[
"Jia",
"Lian-Bao",
""
],
[
"Li",
"Tong",
""
]
] | The XENON1T excess of keV electron recoil events may be induced by the scattering of electrons and long-lived particles with MeV mass and high-speed. We consider a tangible model composed of two scalar MeV dark matter (DM) particles $S_A$ and $S_B$ to interpret the XENON1T keV excess via boosted $S_B$. A small mass splitting $m_{S_A}-m_{S_B}>0$ is introduced and the boosted $S_B$ can be produced by the dark annihilation process of $S_A S_A^\dagger \to \phi \to S_B S_B^\dagger$ via a resonant scalar $\phi$. The $S_B-$electron scattering is intermediated by a vector boson $X$. Although the constraints from BBN, CMB and low-energy experiments set the $X-$mediated $S_B-$electron scattering cross section to be $\lesssim 10^{-35} \mathrm{cm}^2$, the MeV scale DM with a resonance enhanced dark annihilation today can still provide enough boosted $S_B$ and induce the XENON1T keV excess. The relic density of $S_B$ is significantly reduced by the $s$-wave process of $S_B S_B^\dagger \to X X$ which is allowed by the constraints from CMB and 21-cm absorption. A very small relic fraction of $S_B$ is compatible with the stringent bounds on un-boosted $S_B$-electron scattering in DM direct detection and the $S_A$-electron scattering is also allowed. |
1407.3599 | Herondy Mota | H. F. Santana Mota, Mark Hindmarsh | Big-Bang Nucleosynthesis and Gamma-Ray Constraints on Cosmic Strings
with a large Higgs condensate | 26 pages, 3 figures, 3 tables. Revised version with color figures,
new references and extended discussion mostly in Sec. IV. Referee's
suggestions are also included. To be published in PRD | null | 10.1103/PhysRevD.91.043001 | null | hep-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We consider constraints on cosmic strings from their emission of Higgs
particles, in the case that the strings have a Higgs condensate with amplitude
of order the string mass scale, assuming that a fraction of the energy of
condensate can be turned into radiation near cusps. The injection of energy by
the decaying Higgs particles affects the light element abundances predicted by
standard Big-Bang Nucleosynthesis (BBN), and also contributes to the Diffuse
Gamma-Ray Background (DGRB) in the universe today. We examine the two main
string scenarios (Nambu-Goto and field theory), and find that the primordial
Helium abundance strongly constrains the string tension and the efficiency of
the emission process in the NG scenario, while the strongest BBN constraint in
the FT scenario comes from the Deuterium abundance. The Fermi-LAT measurement
of the DGRB constrains the field theory scenario even more strongly than
previously estimated from EGRET data, requiring that the product of the string
tension {\mu} and Newton's constant G is bounded by G{\mu} <
2.7x10^{-11}{\beta}_{ft}^{-2}, where {\beta}_{ft}^2 is the fraction of the
strings' energy going into Higgs particles.
| [
{
"created": "Mon, 14 Jul 2014 10:43:29 GMT",
"version": "v1"
},
{
"created": "Mon, 21 Jul 2014 09:49:46 GMT",
"version": "v2"
},
{
"created": "Tue, 6 Jan 2015 11:29:11 GMT",
"version": "v3"
}
] | 2017-02-22 | [
[
"Mota",
"H. F. Santana",
""
],
[
"Hindmarsh",
"Mark",
""
]
] | We consider constraints on cosmic strings from their emission of Higgs particles, in the case that the strings have a Higgs condensate with amplitude of order the string mass scale, assuming that a fraction of the energy of condensate can be turned into radiation near cusps. The injection of energy by the decaying Higgs particles affects the light element abundances predicted by standard Big-Bang Nucleosynthesis (BBN), and also contributes to the Diffuse Gamma-Ray Background (DGRB) in the universe today. We examine the two main string scenarios (Nambu-Goto and field theory), and find that the primordial Helium abundance strongly constrains the string tension and the efficiency of the emission process in the NG scenario, while the strongest BBN constraint in the FT scenario comes from the Deuterium abundance. The Fermi-LAT measurement of the DGRB constrains the field theory scenario even more strongly than previously estimated from EGRET data, requiring that the product of the string tension {\mu} and Newton's constant G is bounded by G{\mu} < 2.7x10^{-11}{\beta}_{ft}^{-2}, where {\beta}_{ft}^2 is the fraction of the strings' energy going into Higgs particles. |
1812.07549 | Kyle Lee | Maarten G.A. Buffing, Zhong-Bo Kang, Kyle Lee, Xiaohui Liu | A transverse momentum dependent framework for back-to-back photon+jet
production | 5 pages, 2 figures | null | null | null | hep-ph nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We propose the $pp \rightarrow \text{jet} + \gamma $ as a new process for
studying the Transverse Momentum Dependent Parton Distribution Functions
(TMDs). To do so, we developed a novel framework for the jet-$\gamma$ imbalance
in $pp \rightarrow \text{jet} + \gamma $ using Soft Collinear Effective Theory.
The new framework opens up many new insights to the TMDs which the current TMD
studies confined to the Drell-Yan and semi-inclusive deep inelastic scattering
processes cannot achieve. The established formalism provides, for the first
time, a first principle prediction of the jet-$\gamma$ imbalance in $pp$
collisions and therefore a first direct probe of the factorization breaking
effects when compared with the future experimental data. If the factorization
breaking effects are found small, the process will offer the unique
sensitivities to both the polarized and un-polarized quark/gluon TMDs. We
demonstrate the predictive power of the framework by calculating each component
in the formalism to the next-to-leading order accuracy and by realizing the
next-to-leading-logarithmic evolution. We provide the first numerical estimates
for this process, for both the unpolarized cross section and the Sivers
asymmetry.
| [
{
"created": "Tue, 18 Dec 2018 18:26:42 GMT",
"version": "v1"
}
] | 2018-12-19 | [
[
"Buffing",
"Maarten G. A.",
""
],
[
"Kang",
"Zhong-Bo",
""
],
[
"Lee",
"Kyle",
""
],
[
"Liu",
"Xiaohui",
""
]
] | We propose the $pp \rightarrow \text{jet} + \gamma $ as a new process for studying the Transverse Momentum Dependent Parton Distribution Functions (TMDs). To do so, we developed a novel framework for the jet-$\gamma$ imbalance in $pp \rightarrow \text{jet} + \gamma $ using Soft Collinear Effective Theory. The new framework opens up many new insights to the TMDs which the current TMD studies confined to the Drell-Yan and semi-inclusive deep inelastic scattering processes cannot achieve. The established formalism provides, for the first time, a first principle prediction of the jet-$\gamma$ imbalance in $pp$ collisions and therefore a first direct probe of the factorization breaking effects when compared with the future experimental data. If the factorization breaking effects are found small, the process will offer the unique sensitivities to both the polarized and un-polarized quark/gluon TMDs. We demonstrate the predictive power of the framework by calculating each component in the formalism to the next-to-leading order accuracy and by realizing the next-to-leading-logarithmic evolution. We provide the first numerical estimates for this process, for both the unpolarized cross section and the Sivers asymmetry. |
2302.10829 | Mario Fern\'andez Navarro | Mario Fern\'andez Navarro | Flavour hierarchies and $B$-anomalies in a twin Pati-Salam theory of
flavour | 8 pages + references, 4 figures, Contribution to the Proceedings of
the 8th Symposium on Prospects in the Physics of Discrete Symmetries
(DISCRETE 2022), 7-11 November 2022, Baden-Baden, Germany, v2: A few
references added | null | null | null | hep-ph | http://creativecommons.org/licenses/by/4.0/ | In this manuscript, based on arXiv:2209.00276, I present a model which can
simultaneously explain and connect the flavour hierarchies of the Standard
Model with flavour anomalies in $B$-physics. I will briefly introduce the model
and highlight the main features, including a common origin of Yukawa couplings
and vector leptoquark $U_{1}$ couplings to Standard Model fermions. A GIM-like
mechanism allows for large leptoquark couplings which can explain the
$B$-anomalies, while protecting from the most dangerous FCNCs that could be
mediated by a heavy coloron and $Z'$. Finally, I will highlight some of the
most promising signals at low energy processes which can test the model in the
upcoming future. The analysis has been updated with the late 2022 measurements
of $R_{K^{(*)}}$ by LHCb.
| [
{
"created": "Tue, 21 Feb 2023 17:08:42 GMT",
"version": "v1"
},
{
"created": "Thu, 9 Mar 2023 12:50:08 GMT",
"version": "v2"
}
] | 2023-03-10 | [
[
"Navarro",
"Mario Fernández",
""
]
] | In this manuscript, based on arXiv:2209.00276, I present a model which can simultaneously explain and connect the flavour hierarchies of the Standard Model with flavour anomalies in $B$-physics. I will briefly introduce the model and highlight the main features, including a common origin of Yukawa couplings and vector leptoquark $U_{1}$ couplings to Standard Model fermions. A GIM-like mechanism allows for large leptoquark couplings which can explain the $B$-anomalies, while protecting from the most dangerous FCNCs that could be mediated by a heavy coloron and $Z'$. Finally, I will highlight some of the most promising signals at low energy processes which can test the model in the upcoming future. The analysis has been updated with the late 2022 measurements of $R_{K^{(*)}}$ by LHCb. |
2101.00549 | Yueling Yang | Yueling Yang, Mingfei Duan, Junliang Lu, Jinshu Huang, Junfeng Sun | Study of the ${\Upsilon}(1S)$ ${\to}$ $DP$ decays | 13 pages, 2 figures | Int. J. Mod. Phys. A 36, 2150061 (2021) | 10.1142/S0217751X21500615 | null | hep-ph | http://creativecommons.org/licenses/by/4.0/ | Inspired by the potential prospects of high-luminosity dedicated colliders
and the high enthusiasms in searching for new physics in the flavor sector at
the intensity frontier, the ${\Upsilon}(1S)$ ${\to}$ $D^{-}{\pi}^{+}$,
$\overline{D}^{0}{\pi}^{0}$ and $D_{s}^{-}K^{+}$ weak decays are studied with
the perturbative QCD approach. It is found within the standard model that the
branching ratios for the concerned processes are tiny, about ${\cal
O}(10^{-18})$, and far beyond the detective ability of current experiments
unless there exists some significant enhancements from a noval interaction.
| [
{
"created": "Sun, 3 Jan 2021 03:16:40 GMT",
"version": "v1"
},
{
"created": "Mon, 22 Feb 2021 03:45:23 GMT",
"version": "v2"
}
] | 2021-02-23 | [
[
"Yang",
"Yueling",
""
],
[
"Duan",
"Mingfei",
""
],
[
"Lu",
"Junliang",
""
],
[
"Huang",
"Jinshu",
""
],
[
"Sun",
"Junfeng",
""
]
] | Inspired by the potential prospects of high-luminosity dedicated colliders and the high enthusiasms in searching for new physics in the flavor sector at the intensity frontier, the ${\Upsilon}(1S)$ ${\to}$ $D^{-}{\pi}^{+}$, $\overline{D}^{0}{\pi}^{0}$ and $D_{s}^{-}K^{+}$ weak decays are studied with the perturbative QCD approach. It is found within the standard model that the branching ratios for the concerned processes are tiny, about ${\cal O}(10^{-18})$, and far beyond the detective ability of current experiments unless there exists some significant enhancements from a noval interaction. |
0812.3799 | Claudia Hagedorn | A. Adulpravitchai, A. Blum, C. Hagedorn | A Supersymmetric D4 Model for mu-tau Symmetry | 19 pages, 4 figures | JHEP 0903:046,2009 | 10.1088/1126-6708/2009/03/046 | SISSA 76/2008/EP | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We construct a supersymmeterized version of the model presented by Grimus and
Lavoura (GL) in [1] which predicts theta_{23} maximal and theta_{13}=0 in the
lepton sector. For this purpose, we extend the flavor group, which is D4 x
Z2^{(aux)} in the original model, to D4 x Z5. An additional difference is the
absence of right-handed neutrinos. Despite these changes the model is the same
as the GL model, since theta_{23} maximal and theta_{13}=0 arise through the
same mismatch of D4 subgroups, D2 in the charged lepton and Z2 in the neutrino
sector. In our setup D4 is solely broken by gauge singlets, the flavons. We
show that their vacuum structure, which leads to the prediction of theta_{13}
and theta_{23}, is a natural result of the scalar potential. We find that the
neutrino mass matrix only allows for inverted hierarchy, if we assume a certain
form of spontaneous CP violation. The quantity |m_{ee}|, measured in
neutrinoless double beta decay, is nearly equal to the lightest neutrino mass
m3. The Majorana phases phi1 and phi2 are restricted to a certain range for m3
< 0.06 eV. We discuss the next-to-leading order corrections which give rise to
shifts in the vacuum expectation values of the flavons. These induce deviations
from maximal atmospheric mixing and vanishing theta_{13}. It turns out that
these deviations are smaller for theta_{23} than for theta_{13}.
| [
{
"created": "Fri, 19 Dec 2008 14:50:02 GMT",
"version": "v1"
}
] | 2010-04-14 | [
[
"Adulpravitchai",
"A.",
""
],
[
"Blum",
"A.",
""
],
[
"Hagedorn",
"C.",
""
]
] | We construct a supersymmeterized version of the model presented by Grimus and Lavoura (GL) in [1] which predicts theta_{23} maximal and theta_{13}=0 in the lepton sector. For this purpose, we extend the flavor group, which is D4 x Z2^{(aux)} in the original model, to D4 x Z5. An additional difference is the absence of right-handed neutrinos. Despite these changes the model is the same as the GL model, since theta_{23} maximal and theta_{13}=0 arise through the same mismatch of D4 subgroups, D2 in the charged lepton and Z2 in the neutrino sector. In our setup D4 is solely broken by gauge singlets, the flavons. We show that their vacuum structure, which leads to the prediction of theta_{13} and theta_{23}, is a natural result of the scalar potential. We find that the neutrino mass matrix only allows for inverted hierarchy, if we assume a certain form of spontaneous CP violation. The quantity |m_{ee}|, measured in neutrinoless double beta decay, is nearly equal to the lightest neutrino mass m3. The Majorana phases phi1 and phi2 are restricted to a certain range for m3 < 0.06 eV. We discuss the next-to-leading order corrections which give rise to shifts in the vacuum expectation values of the flavons. These induce deviations from maximal atmospheric mixing and vanishing theta_{13}. It turns out that these deviations are smaller for theta_{23} than for theta_{13}. |
hep-ph/0701055 | Eduardo Pont\'on | Marcela Carena, Eduardo Ponton, Jose Santiago, C.E.M. Wagner | Electroweak constraints on warped models with custodial symmetry | 38 pages, 8 figures | Phys.Rev.D76:035006,2007 | 10.1103/PhysRevD.76.035006 | null | hep-ph | null | It has been recently argued that realistic models with warped extra
dimensions can have Kaluza-Klein particles accessible at the Large Hadron
Collider if a custodial symmetry, SU(2)_V \times P_{LR}, is used to protect the
T parameter and the coupling of the left-handed bottom quark to the Z gauge
boson. In this article we emphasize that such a symmetry implies that the loop
corrections to both the T parameter and the Z b_L \bar{b}_L coupling are
calculable. In general, these corrections are correlated, can be sizable, and
should be considered to determine the allowed parameter space region in models
with warped extra dimensions and custodial symmetry, including Randall-Sundrum
models with a fundamental Higgs, models of gauge-Higgs unification and
Higgsless models. As an example, we derive the constraints that arise on a
representative model of gauge-Higgs unification from a global fit to the
precision electroweak observables. A scan over the parameter space typically
leads to a lower bound on the Kaluza-Klein excitations of the gauge bosons of
about 2-3 TeV, depending on the configuration. In the fermionic sector one can
have Kaluza-Klein excitations with masses of a few hundred GeV. We present the
constraints on these light fermions from recent Tevatron searches, and explore
interesting discovery channels at the LHC.
| [
{
"created": "Mon, 8 Jan 2007 21:03:13 GMT",
"version": "v1"
}
] | 2010-04-06 | [
[
"Carena",
"Marcela",
""
],
[
"Ponton",
"Eduardo",
""
],
[
"Santiago",
"Jose",
""
],
[
"Wagner",
"C. E. M.",
""
]
] | It has been recently argued that realistic models with warped extra dimensions can have Kaluza-Klein particles accessible at the Large Hadron Collider if a custodial symmetry, SU(2)_V \times P_{LR}, is used to protect the T parameter and the coupling of the left-handed bottom quark to the Z gauge boson. In this article we emphasize that such a symmetry implies that the loop corrections to both the T parameter and the Z b_L \bar{b}_L coupling are calculable. In general, these corrections are correlated, can be sizable, and should be considered to determine the allowed parameter space region in models with warped extra dimensions and custodial symmetry, including Randall-Sundrum models with a fundamental Higgs, models of gauge-Higgs unification and Higgsless models. As an example, we derive the constraints that arise on a representative model of gauge-Higgs unification from a global fit to the precision electroweak observables. A scan over the parameter space typically leads to a lower bound on the Kaluza-Klein excitations of the gauge bosons of about 2-3 TeV, depending on the configuration. In the fermionic sector one can have Kaluza-Klein excitations with masses of a few hundred GeV. We present the constraints on these light fermions from recent Tevatron searches, and explore interesting discovery channels at the LHC. |
hep-ph/0007066 | Miura | Takahiro Miura, Eiichi Takasugi, Masaki Yoshimura | Quantum effects for the neutrino mixing matrix in the democratic-type
model | LaTeX, 21 pages, 2 figures, some mistakes corrected | Prog.Theor.Phys. 104 (2000) 1173-1187 | 10.1143/PTP.104.1173 | OU-HET 353 | hep-ph | null | We investigate the quantum effects for the democratic-type neutrino mass
matrix given at the right-handed neutrino mass scale $m_R$ in order to see (i)
whether $\theta_{23}=-\pi/4$ predicted by the model is stable to explain the
atmospheric neutrino anomaly, (ii) how $\theta_{12}$ and $\theta_{13}$ behave,
and (iii) whether the predicted Dirac CP phase $\delta$ keeps maximal size, at
the weak scale $m_Z$. We find that, for the (inversely) hierarchical mass
spectrum with $m_1\sim m_2$, $\theta_{23}$ and $\theta_{13}$ are stable, while
$\theta_{12}$ is not so, which leads to the possibility that the solar neutrino
mixing angle can become large at $m_Z$ even if it is taken small at $m_R$. We
also show that $\delta$ keeps almost maximal for the above mass spectrum, and
our model can give the large CP violation effect in the future neutrino
oscillation experiments if the solar neutrino puzzle is explained by the large
mixing angle MSW solution.
| [
{
"created": "Fri, 7 Jul 2000 07:19:35 GMT",
"version": "v1"
},
{
"created": "Wed, 20 Sep 2000 09:30:03 GMT",
"version": "v2"
}
] | 2009-10-31 | [
[
"Miura",
"Takahiro",
""
],
[
"Takasugi",
"Eiichi",
""
],
[
"Yoshimura",
"Masaki",
""
]
] | We investigate the quantum effects for the democratic-type neutrino mass matrix given at the right-handed neutrino mass scale $m_R$ in order to see (i) whether $\theta_{23}=-\pi/4$ predicted by the model is stable to explain the atmospheric neutrino anomaly, (ii) how $\theta_{12}$ and $\theta_{13}$ behave, and (iii) whether the predicted Dirac CP phase $\delta$ keeps maximal size, at the weak scale $m_Z$. We find that, for the (inversely) hierarchical mass spectrum with $m_1\sim m_2$, $\theta_{23}$ and $\theta_{13}$ are stable, while $\theta_{12}$ is not so, which leads to the possibility that the solar neutrino mixing angle can become large at $m_Z$ even if it is taken small at $m_R$. We also show that $\delta$ keeps almost maximal for the above mass spectrum, and our model can give the large CP violation effect in the future neutrino oscillation experiments if the solar neutrino puzzle is explained by the large mixing angle MSW solution. |
1607.01659 | Andrea Tesi | Francesco Sannino, Alessandro Strumia, Andrea Tesi, Elena Vigiani | Fundamental partial compositeness | 36 pages, 3 figures, 5 tables. v2: final published version, expanded
discussion about neutrino masses, dark matter and flavour | null | 10.1007/JHEP11(2016)029 | CERN-PH-TH-2016-148, CP3-Origins-2016-027, EFI-16-15, IFUP-TH/2016 | hep-ph hep-lat | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We construct renormalizable Standard Model extensions, valid up to the Planck
scale, that give a composite Higgs from a new fundamental strong force acting
on fermions and scalars. Yukawa interactions of these particles with Standard
Model fermions realize the partial compositeness scenario. Under certain
assumptions on the dynamics of the scalars, successful models exist because
gauge quantum numbers of Standard Model fermions admit a minimal enough 'square
root'. Furthermore, right-handed SM fermions have an SU(2)$_R$-like structure,
yielding a custodially-protected composite Higgs. Baryon and lepton numbers
arise accidentally. Standard Model fermions acquire mass at tree level, while
the Higgs potential and flavor violations are generated by quantum corrections.
We further discuss accidental symmetries and other dynamical features stemming
from the new strongly interacting scalars. If the same phenomenology can be
obtained from models without our elementary scalars, they would reappear as
composite states.
| [
{
"created": "Wed, 6 Jul 2016 15:09:33 GMT",
"version": "v1"
},
{
"created": "Mon, 31 Oct 2016 16:41:03 GMT",
"version": "v2"
}
] | 2016-11-23 | [
[
"Sannino",
"Francesco",
""
],
[
"Strumia",
"Alessandro",
""
],
[
"Tesi",
"Andrea",
""
],
[
"Vigiani",
"Elena",
""
]
] | We construct renormalizable Standard Model extensions, valid up to the Planck scale, that give a composite Higgs from a new fundamental strong force acting on fermions and scalars. Yukawa interactions of these particles with Standard Model fermions realize the partial compositeness scenario. Under certain assumptions on the dynamics of the scalars, successful models exist because gauge quantum numbers of Standard Model fermions admit a minimal enough 'square root'. Furthermore, right-handed SM fermions have an SU(2)$_R$-like structure, yielding a custodially-protected composite Higgs. Baryon and lepton numbers arise accidentally. Standard Model fermions acquire mass at tree level, while the Higgs potential and flavor violations are generated by quantum corrections. We further discuss accidental symmetries and other dynamical features stemming from the new strongly interacting scalars. If the same phenomenology can be obtained from models without our elementary scalars, they would reappear as composite states. |
1409.7265 | Per Osland | B. Grzadkowski, O. M. Ogreid and P. Osland | Measuring CP violation in Two-Higgs-Doublet models in light of the LHC
Higgs data | 26 pages, 7 figures. Version published in JHEP | null | 10.1007/JHEP11(2014)084 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In Two-Higgs-Doublet models, the conditions for CP violation can be expressed
in terms of invariants under U(2) rotations among the two SU(2) Higgs doublet
fields. In order to design a strategy for measuring the invariants we express
them in terms of observables, i.e., masses and couplings of scalar bosons. We
find amplitudes directly sensitive to the invariants. Observation of the
Standard-Model-like Higgs boson at the LHC severely constrains the models. In
particular, in the model with Z_2 symmetry imposed on dimension-4 terms (in
order to eliminate tree-level flavour-changing neutral currents), CP violation
is strongly suppressed. On the other hand, the most general Two-Higgs-Doublet
model (without Z_2 symmetry) would still allow for CP violation to be present
in the model, without being in conflict with the LHC data. Consequently, also
flavour-changing neutral currents would in general be expected. We briefly
sketch a strategy for measuring the remaining CP violation.
| [
{
"created": "Thu, 25 Sep 2014 14:14:39 GMT",
"version": "v1"
},
{
"created": "Sat, 29 Nov 2014 22:22:50 GMT",
"version": "v2"
}
] | 2015-06-23 | [
[
"Grzadkowski",
"B.",
""
],
[
"Ogreid",
"O. M.",
""
],
[
"Osland",
"P.",
""
]
] | In Two-Higgs-Doublet models, the conditions for CP violation can be expressed in terms of invariants under U(2) rotations among the two SU(2) Higgs doublet fields. In order to design a strategy for measuring the invariants we express them in terms of observables, i.e., masses and couplings of scalar bosons. We find amplitudes directly sensitive to the invariants. Observation of the Standard-Model-like Higgs boson at the LHC severely constrains the models. In particular, in the model with Z_2 symmetry imposed on dimension-4 terms (in order to eliminate tree-level flavour-changing neutral currents), CP violation is strongly suppressed. On the other hand, the most general Two-Higgs-Doublet model (without Z_2 symmetry) would still allow for CP violation to be present in the model, without being in conflict with the LHC data. Consequently, also flavour-changing neutral currents would in general be expected. We briefly sketch a strategy for measuring the remaining CP violation. |
1810.00819 | Yuming Wang | Cai-Dian L\"u, Yue-Long Shen, Yu-Ming Wang, Yan-Bing Wei | QCD calculations of $B \to \pi, K$ form factors with higher-twist
corrections | 36 pages, 9 figures | null | 10.1007/JHEP01(2019)024 | null | hep-ph hep-ex hep-lat | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We update QCD calculations of $B \to \pi, K$ form factors at large hadronic
recoil by including the subleading-power corrections from the higher-twist
$B$-meson light-cone distribution amplitudes (LCDAs) up to the twist-six
accuracy and the strange-quark mass effects at leading-power in $\Lambda/m_b$
from the twist-two $B$-meson LCDA $\phi_B^{+}(\omega, \mu)$. The higher-twist
corrections from both the two-particle and three-particle $B$-meson LCDAs are
computed from the light-cone QCD sum rules (LCSR) at tree level. In particular,
we construct the local duality model for the twist-five and -six $B$-meson
LCDAs, in agreement with the corresponding asymptotic behaviours at small quark
and gluon momenta, employing the QCD sum rules in heavy quark effective theory
at leading order in $\alpha_s$. The strange quark mass effects in semileptonic
$B \to K$ form factors yield the leading-power contribution in the heavy quark
expansion, consistent with the power-counting analysis in soft-collinear
effective theory, and they are also computed from the LCSR approach due to the
appearance of the rapidity singularities. We further explore the
phenomenological aspects of the semileptonic $B \to \pi \ell \nu$ decays and
the rare exclusive processes $B \to K \nu \nu$, including the determination of
the CKM matrix element $|V_{ub}|$, the normalized differential $q^2$
distributions and precision observables defined by the ratios of branching
fractions for the above-mentioned two channels in the same intervals of $q^2$.
| [
{
"created": "Mon, 1 Oct 2018 16:58:23 GMT",
"version": "v1"
}
] | 2019-01-30 | [
[
"Lü",
"Cai-Dian",
""
],
[
"Shen",
"Yue-Long",
""
],
[
"Wang",
"Yu-Ming",
""
],
[
"Wei",
"Yan-Bing",
""
]
] | We update QCD calculations of $B \to \pi, K$ form factors at large hadronic recoil by including the subleading-power corrections from the higher-twist $B$-meson light-cone distribution amplitudes (LCDAs) up to the twist-six accuracy and the strange-quark mass effects at leading-power in $\Lambda/m_b$ from the twist-two $B$-meson LCDA $\phi_B^{+}(\omega, \mu)$. The higher-twist corrections from both the two-particle and three-particle $B$-meson LCDAs are computed from the light-cone QCD sum rules (LCSR) at tree level. In particular, we construct the local duality model for the twist-five and -six $B$-meson LCDAs, in agreement with the corresponding asymptotic behaviours at small quark and gluon momenta, employing the QCD sum rules in heavy quark effective theory at leading order in $\alpha_s$. The strange quark mass effects in semileptonic $B \to K$ form factors yield the leading-power contribution in the heavy quark expansion, consistent with the power-counting analysis in soft-collinear effective theory, and they are also computed from the LCSR approach due to the appearance of the rapidity singularities. We further explore the phenomenological aspects of the semileptonic $B \to \pi \ell \nu$ decays and the rare exclusive processes $B \to K \nu \nu$, including the determination of the CKM matrix element $|V_{ub}|$, the normalized differential $q^2$ distributions and precision observables defined by the ratios of branching fractions for the above-mentioned two channels in the same intervals of $q^2$. |
1508.04444 | Peter Winslow | Tao Peng, Michael J. Ramsey-Musolf, Peter Winslow | TeV Lepton Number Violation: From Neutrinoless Double Beta Decay to the
LHC | 5 pages, 3 figures | Phys. Rev. D 93, 093002 (2016) | 10.1103/PhysRevD.93.093002 | ACFI-T15-11 | hep-ph nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We analyze the sensitivity of next-generation tonne-scale neutrinoless double
$\beta$-decay ($0\nu\beta\beta$) experiments and searches for same-sign
di-electrons plus jets at the Large Hadron Collider to TeV scale lepton number
violating interactions. Taking into account previously unaccounted for physics
and detector backgrounds at the LHC, renormalization group evolution, and
long-range contributions to $0\nu\beta\beta$ nuclear matrix elements, we find
that the reach of tonne-scale $0\nu\beta\beta$ generally exceeds that of the
LHC. However, for a range of heavy particle masses near the TeV scale, the high
luminosity LHC and tonne-scale $0\nu\beta\beta$ may provide complementary
probes.
| [
{
"created": "Tue, 18 Aug 2015 20:18:06 GMT",
"version": "v1"
}
] | 2016-05-11 | [
[
"Peng",
"Tao",
""
],
[
"Ramsey-Musolf",
"Michael J.",
""
],
[
"Winslow",
"Peter",
""
]
] | We analyze the sensitivity of next-generation tonne-scale neutrinoless double $\beta$-decay ($0\nu\beta\beta$) experiments and searches for same-sign di-electrons plus jets at the Large Hadron Collider to TeV scale lepton number violating interactions. Taking into account previously unaccounted for physics and detector backgrounds at the LHC, renormalization group evolution, and long-range contributions to $0\nu\beta\beta$ nuclear matrix elements, we find that the reach of tonne-scale $0\nu\beta\beta$ generally exceeds that of the LHC. However, for a range of heavy particle masses near the TeV scale, the high luminosity LHC and tonne-scale $0\nu\beta\beta$ may provide complementary probes. |
0712.2079 | Masashi Wakamatsu | M.Wakamatsu and Y.Nakakoji | Phenomenological analysis of the nucleon spin contents and their scale
dependence | 35 pages, 8 figures, 2 tables, title has been changed, version to
appear in Phys. Rev. D | Phys.Rev.D77:074011,2008 | 10.1103/PhysRevD.77.074011 | OU-HET-593 | hep-ph hep-ex nucl-ex | null | In the past few years, a lot of evidences have been accumulated, which
indicate that the gluon polarization inside the nucleon is likely to be small
at least at the low renormalization scales. On the other hand, the recent
lattice QCD analyses suggest that the net orbital angular momentum carried by
the quarks is nearly zero. There is also some indication noticed by Brodsky and
Gardner based on the COMPASS observation of small single-spin asymmetry on the
isoscalar deuteron target, that the gluon orbital angular momentum inside the
nucleon is likely to be small. Naively combining all these observations, we are
led to a rather embarrassing conclusion that the nucleon constituents
altogether do not carry enough amount of angular momentum saturating the total
nucleon spin. We show that this somewhat confused state of affairs can be
cleared up only by paying careful attention to the scale dependencies of the
nucleon spin decomposition.
| [
{
"created": "Thu, 13 Dec 2007 02:01:12 GMT",
"version": "v1"
},
{
"created": "Fri, 7 Mar 2008 00:51:43 GMT",
"version": "v2"
}
] | 2008-11-26 | [
[
"Wakamatsu",
"M.",
""
],
[
"Nakakoji",
"Y.",
""
]
] | In the past few years, a lot of evidences have been accumulated, which indicate that the gluon polarization inside the nucleon is likely to be small at least at the low renormalization scales. On the other hand, the recent lattice QCD analyses suggest that the net orbital angular momentum carried by the quarks is nearly zero. There is also some indication noticed by Brodsky and Gardner based on the COMPASS observation of small single-spin asymmetry on the isoscalar deuteron target, that the gluon orbital angular momentum inside the nucleon is likely to be small. Naively combining all these observations, we are led to a rather embarrassing conclusion that the nucleon constituents altogether do not carry enough amount of angular momentum saturating the total nucleon spin. We show that this somewhat confused state of affairs can be cleared up only by paying careful attention to the scale dependencies of the nucleon spin decomposition. |
1311.5928 | Jiayin Gu | Hsin-Chia Cheng, Bogdan A. Dobrescu, Jiayin Gu | Higgs mass from compositeness at a multi-TeV scale | 30 pages. v2: discussion of T parameter expanded; references added.
To be published in JHEP | null | 10.1007/JHEP08(2014)095 | FERMILAB-Pub-13-350-T | hep-ph hep-lat | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Within composite Higgs models based on the top seesaw mechanism, we show that
the Higgs field can arise as the pseudo Nambu-Goldstone boson of the broken
U(3)_L chiral symmetry associated with a vector-like quark and the t-b doublet.
As a result, the lightest CP-even neutral state of the composite scalar sector
is lighter than the top quark, and can be identified as the newly discovered
Higgs boson. Constraints on weak isospin violation push the chiral symmetry
breaking scale above a few TeV, implying that other composite scalars are
probably too heavy to be probed at the LHC, but may be within reach at a future
hadron collider with center-of-mass energy of about 100 TeV.
| [
{
"created": "Fri, 22 Nov 2013 23:18:57 GMT",
"version": "v1"
},
{
"created": "Tue, 19 Aug 2014 05:17:05 GMT",
"version": "v2"
}
] | 2015-06-18 | [
[
"Cheng",
"Hsin-Chia",
""
],
[
"Dobrescu",
"Bogdan A.",
""
],
[
"Gu",
"Jiayin",
""
]
] | Within composite Higgs models based on the top seesaw mechanism, we show that the Higgs field can arise as the pseudo Nambu-Goldstone boson of the broken U(3)_L chiral symmetry associated with a vector-like quark and the t-b doublet. As a result, the lightest CP-even neutral state of the composite scalar sector is lighter than the top quark, and can be identified as the newly discovered Higgs boson. Constraints on weak isospin violation push the chiral symmetry breaking scale above a few TeV, implying that other composite scalars are probably too heavy to be probed at the LHC, but may be within reach at a future hadron collider with center-of-mass energy of about 100 TeV. |
2211.10657 | Giulia Ricciardi | Giulia Ricciardi | Anomalies in the heavy sector | 8 pages, presented to XVth Quark Confinement and the Hadron Spectrum,
University of Stavanger, Norway, August 1st - 6th, 2022 | null | 10.1051/epjconf/202227404010 | null | hep-ph hep-ex | http://creativecommons.org/licenses/by/4.0/ | Heavy flavour physics is well described by the Standard Model with the
exception of some measurements which could be pointing to new physics. We
briefly review status and prospects of $R(D^{(\ast)})$ and $R(K^{(\ast)})$
anomalies and also address the long standing tension in the $|V_{cb}|$ and
$|V_{ub}|$ exclusive/inclusive determinations.
| [
{
"created": "Sat, 19 Nov 2022 10:40:23 GMT",
"version": "v1"
}
] | 2023-01-11 | [
[
"Ricciardi",
"Giulia",
""
]
] | Heavy flavour physics is well described by the Standard Model with the exception of some measurements which could be pointing to new physics. We briefly review status and prospects of $R(D^{(\ast)})$ and $R(K^{(\ast)})$ anomalies and also address the long standing tension in the $|V_{cb}|$ and $|V_{ub}|$ exclusive/inclusive determinations. |
1509.04730 | Nader Ghahramany | N. Ghahramany, A. R. Houshyar | Rare semileptonic decay of $\chi_{c1}(1p)$ meson In QCD | 15,3 | null | 10.5506/APhysPolB.46.1939 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The rare semileptonic $\chi_{c1}(1p)\rightarrow D_{s}^{+}e\bar{\nu }$ decay
is analyzed, by using the three-point QCD sum rules. Taking into account the
two-gluon condensate contributions, the transition form factors related to this
decay are calculated and are used to determine the total decay width and
branching fraction. Our findings may be approved by future experiments.
| [
{
"created": "Tue, 15 Sep 2015 20:27:14 GMT",
"version": "v1"
}
] | 2023-07-19 | [
[
"Ghahramany",
"N.",
""
],
[
"Houshyar",
"A. R.",
""
]
] | The rare semileptonic $\chi_{c1}(1p)\rightarrow D_{s}^{+}e\bar{\nu }$ decay is analyzed, by using the three-point QCD sum rules. Taking into account the two-gluon condensate contributions, the transition form factors related to this decay are calculated and are used to determine the total decay width and branching fraction. Our findings may be approved by future experiments. |
hep-ph/0003036 | Ehab Malkawi | Ehab Malkawi (JUST, Jordan), E.I. Lashin (Cario, Eygpt), Hatem Widyan
(JUST, Jordan) | A Light Sterile Neutrino in the TopFlavor Model | Plain Latex file, 12 pages | Phys.Rev. D62 (2000) 033005 | 10.1103/PhysRevD.62.033005 | null | hep-ph | null | A scenario based on the TopFlavor model is presented to explain the origin of
a light sterile neutrino as indicated by all combined neutrino oscillation
experiments. The model is phenomenologically well motivated and compatible with
all available low-energy data. The derived nuetrino mass matrix can
qualitatively explain the observed hierarchy in the neutrino mass splittings as
indicated by the neutrino oscillation data. Numerical results are obtained for
special cases.
| [
{
"created": "Sun, 5 Mar 2000 14:49:33 GMT",
"version": "v1"
}
] | 2009-10-31 | [
[
"Malkawi",
"Ehab",
"",
"JUST, Jordan"
],
[
"Lashin",
"E. I.",
"",
"Cario, Eygpt"
],
[
"Widyan",
"Hatem",
"",
"JUST, Jordan"
]
] | A scenario based on the TopFlavor model is presented to explain the origin of a light sterile neutrino as indicated by all combined neutrino oscillation experiments. The model is phenomenologically well motivated and compatible with all available low-energy data. The derived nuetrino mass matrix can qualitatively explain the observed hierarchy in the neutrino mass splittings as indicated by the neutrino oscillation data. Numerical results are obtained for special cases. |
1705.04105 | David Heymes | Michal Czakon, David Heymes, Alexander Mitov, Davide Pagani, Ioannis
Tsinikos and Marco Zaro | Top-pair production at the LHC through NNLO QCD and NLO EW | 22 pages, 7 figures, version published in JHEP, results are attached
in electronic form, results and additional material available from this
website: http://www.precision.hep.phy.cam.ac.uk/results/ttbar-nnloqcd-nloew/ | J. High Energ. Phys. (2017) 2017/10: 186 | 10.1007/JHEP10(2017)186 | Cavendish-HEP-17/07, CP3-17-12, TUM-HEP-1084/17, TTK-17-15 | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this work we present for the first time predictions for top-quark pair
differential distributions at the LHC at NNLO QCD accuracy and including EW
corrections. For the latter we include not only contributions of ${\cal
O}(\alpha_s^2 \alpha)$, but also those of order ${\cal O}(\alpha_s \alpha^2)$
and ${\cal O}( \alpha^3)$. Besides providing phenomenological predictions for
all main differential distributions with stable top quarks, we also study the
following issues. 1) The effect of the photon PDF on top-pair spectra: we find
it to be strongly dependent on the PDF set used -- especially for the top $p_T$
distribution. 2) The difference between the additive and multiplicative
approaches for combining QCD and EW corrections: with our scale choice, we find
relatively small differences between the central predictions, but reduced scale
dependence within the multiplicative approach. 3) The potential effect from the
radiation of heavy bosons on inclusive top-pair spectra: we find it to be,
typically, negligible.
| [
{
"created": "Thu, 11 May 2017 10:45:53 GMT",
"version": "v1"
},
{
"created": "Wed, 15 Nov 2017 13:46:47 GMT",
"version": "v2"
}
] | 2017-11-16 | [
[
"Czakon",
"Michal",
""
],
[
"Heymes",
"David",
""
],
[
"Mitov",
"Alexander",
""
],
[
"Pagani",
"Davide",
""
],
[
"Tsinikos",
"Ioannis",
""
],
[
"Zaro",
"Marco",
""
]
] | In this work we present for the first time predictions for top-quark pair differential distributions at the LHC at NNLO QCD accuracy and including EW corrections. For the latter we include not only contributions of ${\cal O}(\alpha_s^2 \alpha)$, but also those of order ${\cal O}(\alpha_s \alpha^2)$ and ${\cal O}( \alpha^3)$. Besides providing phenomenological predictions for all main differential distributions with stable top quarks, we also study the following issues. 1) The effect of the photon PDF on top-pair spectra: we find it to be strongly dependent on the PDF set used -- especially for the top $p_T$ distribution. 2) The difference between the additive and multiplicative approaches for combining QCD and EW corrections: with our scale choice, we find relatively small differences between the central predictions, but reduced scale dependence within the multiplicative approach. 3) The potential effect from the radiation of heavy bosons on inclusive top-pair spectra: we find it to be, typically, negligible. |
2106.15624 | Kyle Lee | Zhong-Bo Kang, Kyle Lee, Ding Yu Shao, Fanyi Zhao | Spin asymmetries in electron-jet production at the future electron ion
collider | 46 pages, 10 figures, 5 tables | null | 10.1007/JHEP11(2021)005 | null | hep-ph hep-ex nucl-ex nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study all the possible spin asymmetries that can arise in back-to-back
electron-jet production, $ep\rightarrow e+\text{jet}+X$, as well as the
associated jet fragmentation process, $ep\rightarrow e+ \text{jet} (h)+X$, in
electron-proton collisions. We derive the factorization formalism for these
spin asymmetries and perform the corresponding phenomenology for the kinematics
relevant to the future electron ion collider. In the case of unpolarized
electron-proton scattering, we also give predictions for azimuthal asymmetries
for the HERA experiment. This demonstrates that electron-jet production is an
outstanding process for probing unpolarized and polarized transverse momentum
dependent parton distribution functions and fragmentation functions.
| [
{
"created": "Tue, 29 Jun 2021 18:00:00 GMT",
"version": "v1"
}
] | 2021-11-24 | [
[
"Kang",
"Zhong-Bo",
""
],
[
"Lee",
"Kyle",
""
],
[
"Shao",
"Ding Yu",
""
],
[
"Zhao",
"Fanyi",
""
]
] | We study all the possible spin asymmetries that can arise in back-to-back electron-jet production, $ep\rightarrow e+\text{jet}+X$, as well as the associated jet fragmentation process, $ep\rightarrow e+ \text{jet} (h)+X$, in electron-proton collisions. We derive the factorization formalism for these spin asymmetries and perform the corresponding phenomenology for the kinematics relevant to the future electron ion collider. In the case of unpolarized electron-proton scattering, we also give predictions for azimuthal asymmetries for the HERA experiment. This demonstrates that electron-jet production is an outstanding process for probing unpolarized and polarized transverse momentum dependent parton distribution functions and fragmentation functions. |
1512.00636 | Kensuke Homma | Yoshihide Nakamiya and Kensuke Homma | Probing vacuum birefringence under a high-intensity laser field with
gamma-ray polarimetry at the GeV scale | 11 pages, 4 figures | null | null | null | hep-ph hep-ex physics.ins-det | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Probing vacuum structures deformed by high intense fields is of great
interest in general. In the context of quantum electrodynamics (QED), the
vacuum exposed by a linearly polarized high-intensity laser field is expected
to show birefringence. We consider the combination of a 10 PW laser system to
pump the vacuum and 1 GeV photons to probe the birefringent effect. The vacuum
birefringence can be measured via the polarization flip of the probe
$\gamma$-rays which can also be interpreted as phase retardation of probe
photons. We provide theoretically how to extract phase retardation of GeV probe
photons via pair-wise topology of the Bethe-Heitler process in a polarimeter
and then evaluate the measurability of the vacuum birefringence via phase
retardation given a concrete polarimeter design with a realistic set of laser
parameters and achievable pulse statistics.
| [
{
"created": "Wed, 2 Dec 2015 10:29:44 GMT",
"version": "v1"
},
{
"created": "Sat, 6 May 2017 13:50:11 GMT",
"version": "v2"
}
] | 2017-05-09 | [
[
"Nakamiya",
"Yoshihide",
""
],
[
"Homma",
"Kensuke",
""
]
] | Probing vacuum structures deformed by high intense fields is of great interest in general. In the context of quantum electrodynamics (QED), the vacuum exposed by a linearly polarized high-intensity laser field is expected to show birefringence. We consider the combination of a 10 PW laser system to pump the vacuum and 1 GeV photons to probe the birefringent effect. The vacuum birefringence can be measured via the polarization flip of the probe $\gamma$-rays which can also be interpreted as phase retardation of probe photons. We provide theoretically how to extract phase retardation of GeV probe photons via pair-wise topology of the Bethe-Heitler process in a polarimeter and then evaluate the measurability of the vacuum birefringence via phase retardation given a concrete polarimeter design with a realistic set of laser parameters and achievable pulse statistics. |
hep-ph/0403234 | Jurgen Berges | J. Berges, S. Borsanyi, C. Wetterich | Prethermalization | 4 pages, 4 figures, PRL version, minor changes | Phys.Rev.Lett. 93 (2004) 142002 | 10.1103/PhysRevLett.93.142002 | null | hep-ph cond-mat.other hep-th nucl-th | null | Prethermalization of the equation of state and the kinetic temperature to
their equilibrium values occurs on time scales dramatically shorter than the
thermal equilibration time. This is a crucial ingredient for the understanding
of collisions of heavy nuclei or other nonequilibrium phenomena in complex
quantum and classical many body systems. We also compare the chemical
equilibration time with other characteristic time scales.
| [
{
"created": "Mon, 22 Mar 2004 13:15:33 GMT",
"version": "v1"
},
{
"created": "Fri, 13 Jan 2006 09:39:08 GMT",
"version": "v2"
}
] | 2009-11-10 | [
[
"Berges",
"J.",
""
],
[
"Borsanyi",
"S.",
""
],
[
"Wetterich",
"C.",
""
]
] | Prethermalization of the equation of state and the kinetic temperature to their equilibrium values occurs on time scales dramatically shorter than the thermal equilibration time. This is a crucial ingredient for the understanding of collisions of heavy nuclei or other nonequilibrium phenomena in complex quantum and classical many body systems. We also compare the chemical equilibration time with other characteristic time scales. |
hep-ph/0006281 | Tomoharu Suzuki | N.Haba, Tomoharu Suzuki | Is $U_{e3}$ really related to the solar neutrino solutions? | 7pages, no figure | Mod.Phys.Lett. A15 (2000) 2257-2264 | 10.1142/S0217732300002838 | DPNU-00-22 | hep-ph | null | It has been said that the measurements of $U_{e3}$ in the lepton flavor
mixing matrix would help discriminate between the possible solar neutrino
solutions under the natural conditions with the neutrino mass hierarchies of
$m_1 \ll m_2 \ll m_3$ and $m_1 \sim m_2 \gg m_3$, where $m_i$ is the $i$-th
generation neutrino absolute mass. However, it is not true, and the relation
between $\sin^2 2 \theta_{12}$ and $U_{e3}$ obtained by Akhmedov, Branco, and
Rebelo is trivial in actual. We show in this paper that the value of $U_{e3}$
cannot predict the solar neutrino solutions without one additional nontrivial
condition.
| [
{
"created": "Sat, 24 Jun 2000 09:14:37 GMT",
"version": "v1"
}
] | 2009-10-31 | [
[
"Haba",
"N.",
""
],
[
"Suzuki",
"Tomoharu",
""
]
] | It has been said that the measurements of $U_{e3}$ in the lepton flavor mixing matrix would help discriminate between the possible solar neutrino solutions under the natural conditions with the neutrino mass hierarchies of $m_1 \ll m_2 \ll m_3$ and $m_1 \sim m_2 \gg m_3$, where $m_i$ is the $i$-th generation neutrino absolute mass. However, it is not true, and the relation between $\sin^2 2 \theta_{12}$ and $U_{e3}$ obtained by Akhmedov, Branco, and Rebelo is trivial in actual. We show in this paper that the value of $U_{e3}$ cannot predict the solar neutrino solutions without one additional nontrivial condition. |
1011.5262 | Eun-Joo Kim | Jong Bum Choi, Eun-Joo Kim, Moon Q. Whang, Jin D. Kim, and Su K. Lee | Nonlocal Condensates in Hadrons and Multiquark States | 4 pages, 4 figures | null | null | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The definition of QCD vacuum is an important issue in the description of
hadronic properties. Recent researches on the vacuum condensates have resulted
in the suggestion of in-hadron condensates which can be taken as a paradigm
shift concerning the viewpoints on the QCD vacuum. In this Letter, we will try
to define the in-hadron regions and to classify the hadronic and multiquark
states. Topological classifications are naturally introduced and by considering
nonlocal measure we can estimate the variations of dimension 2 condensate $<
A_{\mu}^2 >$. The calculational techniques can be easily applied to multiquark
states and are expected to be applied to the more complex nuclear states.
| [
{
"created": "Wed, 24 Nov 2010 00:09:38 GMT",
"version": "v1"
},
{
"created": "Tue, 14 Dec 2010 07:22:39 GMT",
"version": "v2"
}
] | 2010-12-15 | [
[
"Choi",
"Jong Bum",
""
],
[
"Kim",
"Eun-Joo",
""
],
[
"Whang",
"Moon Q.",
""
],
[
"Kim",
"Jin D.",
""
],
[
"Lee",
"Su K.",
""
]
] | The definition of QCD vacuum is an important issue in the description of hadronic properties. Recent researches on the vacuum condensates have resulted in the suggestion of in-hadron condensates which can be taken as a paradigm shift concerning the viewpoints on the QCD vacuum. In this Letter, we will try to define the in-hadron regions and to classify the hadronic and multiquark states. Topological classifications are naturally introduced and by considering nonlocal measure we can estimate the variations of dimension 2 condensate $< A_{\mu}^2 >$. The calculational techniques can be easily applied to multiquark states and are expected to be applied to the more complex nuclear states. |
1512.04381 | Cong Wang | Cong Wang, Ming-Zhen Zhou and Hong Chen | $\gamma\gamma\rightarrow M^{+}M^{-}(M=\pi, K)$ processes with twist-3
corrections in QCD | 18 pages, 13 figures | Eur. Phys. J. C, 77 (2017) 219 | 10.1140/epjc/s10052-017-4764-2 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the $\gamma\gamma\rightarrow M^{+}M^{-}(M=\pi, K)$ processes with
the contributions from the two-particle twist-2 and twist-3 distribution
amplitudes of pion and kaon mesons on BHL prescription in the standard
hard-scattering approach. The results show that the contributions from twist-3
parts are actually not power suppressed comparing with the leading-twist
contributions and the cross sections agree well with the experimental data in
the two-photon center-of-mass energy $W>2.8$ GeV. We also predict the cross
section ratio $\sigma_{0}(\pi^{+}\pi^{-})/\sigma_{0}(K^{+}K^{-})$, which is
compatible with the experimental data from TPC and Belle.
| [
{
"created": "Mon, 14 Dec 2015 16:10:10 GMT",
"version": "v1"
},
{
"created": "Tue, 29 Dec 2015 15:52:29 GMT",
"version": "v2"
},
{
"created": "Fri, 11 Mar 2016 14:27:35 GMT",
"version": "v3"
},
{
"created": "Wed, 13 Apr 2016 11:19:52 GMT",
"version": "v4"
},
{
"created": "Sun, 12 Jun 2016 13:11:37 GMT",
"version": "v5"
}
] | 2017-05-15 | [
[
"Wang",
"Cong",
""
],
[
"Zhou",
"Ming-Zhen",
""
],
[
"Chen",
"Hong",
""
]
] | We study the $\gamma\gamma\rightarrow M^{+}M^{-}(M=\pi, K)$ processes with the contributions from the two-particle twist-2 and twist-3 distribution amplitudes of pion and kaon mesons on BHL prescription in the standard hard-scattering approach. The results show that the contributions from twist-3 parts are actually not power suppressed comparing with the leading-twist contributions and the cross sections agree well with the experimental data in the two-photon center-of-mass energy $W>2.8$ GeV. We also predict the cross section ratio $\sigma_{0}(\pi^{+}\pi^{-})/\sigma_{0}(K^{+}K^{-})$, which is compatible with the experimental data from TPC and Belle. |
1805.05807 | Shuang Li | Shuang Li, Chaowen Wang | Charm-strange meson production in ultra-relativistic heavy-ion
collisions at the CERN-LHC energies | 8 pages, 8 figures; Accepted by Phys. Rev. C | Phys. Rev. C 98, 034914 (2018) | 10.1103/PhysRevC.98.034914 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The nuclear modification factor ${R}_{\rm AA}$ and the elliptic flow
coefficient ${v}_{\rm 2}$ of charm-strange meson $D^{+}_{s}$ is systematically
studied in Pb--Pb collisions at $\sqrt{s_{\rm NN}}=5.02~{\rm TeV}$ and
$2.76~{\rm TeV}$. During the modeling, the coupling strength between the
injected charm quark and the incident medium constituents, is extracted from
the lattice QCD calculations: $2\pi TD_{s}=7$ (\textbf{Model-A}) and $2\pi
TD_{s}=1.3 + (T/T_{c})^2$ (\textbf{Model-B}). We find that, comparing ${R}_{\rm
AA}(D^{+}_{s})$ with ${R}_{\rm AA}(non-strange)$, the heavy-light coalescence
effect is more pronounced for the former one, resulting in an enhancement
behavior in the range $2\lesssim {p}_{\rm T}\lesssim5~{\rm GeV}$. The
predictions of ${R}_{\rm AA}(D^{+}_{s})$ and ${R}_{\rm AA}(non-strange)$ favor
Model-A to have a better description of the measured ${p}_{\rm T}$ dependence
in both energies, while their ${v}_{\rm 2}$ prefer Model-B at moderate
${p}_{\rm T}$ ($2\lesssim {p}_{\rm T}\lesssim4~{\rm GeV}$). Therefore, it is
necessary to consider the temperature- and/or momentum-dependence of $2\pi
TD_{s}$ to describe simultaneously ${R}_{\rm AA}(D^{+}_{s})$ and ${v}_{\rm
2}(D^{+}_{s})$ in different centrality classes in Pb--Pb collisions.
| [
{
"created": "Tue, 15 May 2018 14:31:00 GMT",
"version": "v1"
},
{
"created": "Sat, 8 Sep 2018 02:09:16 GMT",
"version": "v2"
}
] | 2018-09-26 | [
[
"Li",
"Shuang",
""
],
[
"Wang",
"Chaowen",
""
]
] | The nuclear modification factor ${R}_{\rm AA}$ and the elliptic flow coefficient ${v}_{\rm 2}$ of charm-strange meson $D^{+}_{s}$ is systematically studied in Pb--Pb collisions at $\sqrt{s_{\rm NN}}=5.02~{\rm TeV}$ and $2.76~{\rm TeV}$. During the modeling, the coupling strength between the injected charm quark and the incident medium constituents, is extracted from the lattice QCD calculations: $2\pi TD_{s}=7$ (\textbf{Model-A}) and $2\pi TD_{s}=1.3 + (T/T_{c})^2$ (\textbf{Model-B}). We find that, comparing ${R}_{\rm AA}(D^{+}_{s})$ with ${R}_{\rm AA}(non-strange)$, the heavy-light coalescence effect is more pronounced for the former one, resulting in an enhancement behavior in the range $2\lesssim {p}_{\rm T}\lesssim5~{\rm GeV}$. The predictions of ${R}_{\rm AA}(D^{+}_{s})$ and ${R}_{\rm AA}(non-strange)$ favor Model-A to have a better description of the measured ${p}_{\rm T}$ dependence in both energies, while their ${v}_{\rm 2}$ prefer Model-B at moderate ${p}_{\rm T}$ ($2\lesssim {p}_{\rm T}\lesssim4~{\rm GeV}$). Therefore, it is necessary to consider the temperature- and/or momentum-dependence of $2\pi TD_{s}$ to describe simultaneously ${R}_{\rm AA}(D^{+}_{s})$ and ${v}_{\rm 2}(D^{+}_{s})$ in different centrality classes in Pb--Pb collisions. |
hep-ph/0404204 | Francisco Yndurain | F. J. Yndurain | Scattering amplitudes at multi TeV energies | Plain TeX. Dedicated to Prof. Yuri Simonov in his 70th birthday | null | null | FTUAM 04-01 | hep-ph | null | We show that a generalized Regge behaviour, $$Im F(s,t)\simeq \Phi(t)(\log
s/\hat{s})^{\nu(t)}(s/\hat{s})^{\alpha_P(t)},\quad{\rm for} |t|<|t_0|,
s\to\infty$$ where $\Phi(t)\simeq e^{bt}$, $\alpha_P(t)\simeq
\alpha_P(0)+\alpha'_P(0)t$, and $t_0$ is the first zero of $\alpha_P(t)$,
$\alpha_P(t_0)=0$, implies that the corresponding cross section is bounded by
$$\sigma_{\rm tot}(s)<({\rm Const.})\times\log s/\hat{s}.$$ This growth,
however, is not sufficient to fit the experimental cross sections. If, instead
of this, we assume saturation of the improved Froissart bound, i.e., a
behaviour $$Im F(s,0)\simeq A(s/\hat{s})\log^2{{s}\over{s_1\log^{7/2} s/s_2}},
$$ a good fit is obtained to $\pi\pi$, $\pi N$, $KN$ and $NN$ cross sections
from c.m. kinetic energy $E_{\rm kin}\simeq1 $ GeV to 30 TeV (producing a cross
section of $108\pm6$ mb at LHC energy). This suggests that the Regge-type
behaviour only holds for values of the momentum transfer very near zero.
| [
{
"created": "Fri, 23 Apr 2004 09:38:03 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Yndurain",
"F. J.",
""
]
] | We show that a generalized Regge behaviour, $$Im F(s,t)\simeq \Phi(t)(\log s/\hat{s})^{\nu(t)}(s/\hat{s})^{\alpha_P(t)},\quad{\rm for} |t|<|t_0|, s\to\infty$$ where $\Phi(t)\simeq e^{bt}$, $\alpha_P(t)\simeq \alpha_P(0)+\alpha'_P(0)t$, and $t_0$ is the first zero of $\alpha_P(t)$, $\alpha_P(t_0)=0$, implies that the corresponding cross section is bounded by $$\sigma_{\rm tot}(s)<({\rm Const.})\times\log s/\hat{s}.$$ This growth, however, is not sufficient to fit the experimental cross sections. If, instead of this, we assume saturation of the improved Froissart bound, i.e., a behaviour $$Im F(s,0)\simeq A(s/\hat{s})\log^2{{s}\over{s_1\log^{7/2} s/s_2}}, $$ a good fit is obtained to $\pi\pi$, $\pi N$, $KN$ and $NN$ cross sections from c.m. kinetic energy $E_{\rm kin}\simeq1 $ GeV to 30 TeV (producing a cross section of $108\pm6$ mb at LHC energy). This suggests that the Regge-type behaviour only holds for values of the momentum transfer very near zero. |
hep-ph/9807336 | Moultaka Gilbert | J.-L. Kneur and G. Moultaka | Inverting the Supersymmetric Standard Model Spectrum: from Physical to
Lagrangian Ino Parameters | Latex, 28 pages, 6 figures, 1 table, some typos corrected, one
paragraph extended in section 4.2. Version to appear in Phys. Rev. D | Phys. Rev. D 59, 015005 (1998) | 10.1103/PhysRevD.59.015005 | PM/98-16 | hep-ph | null | We examine the possibility of recovering the supersymmetric (and soft
supersymmetry breaking) Lagrangian parameters as direct {\em analytical}
expressions of appropriate physical masses, for the unconstrained (but CP and
R-parity conserving) minimal supersymmetric standard model. We concentrate
mainly on the algebraically non-trivial "inversion" for the ino parameters, and
obtain, for given values of $\tan\beta$, simple analytical expressions for the
$\mu$, $M_1$ and $M_2$ parameters in terms of three arbitrary input physical
masses, namely either two chargino and one neutralino masses, or alternatively
one chargino and two neutralino masses. We illustrate and discuss in detail the
possible occurrence of ambiguities in this reconstruction. The dependence of
the resulting ino Lagrangian parameters upon physical masses is illustrated,
and some simple generic behaviour uncovered in this way. We finally briefly
sketch generalizing such an inversion to the full set of MSSM Lagrangian
parameters.
| [
{
"created": "Fri, 10 Jul 1998 23:21:04 GMT",
"version": "v1"
},
{
"created": "Tue, 29 Sep 1998 10:01:41 GMT",
"version": "v2"
}
] | 2016-08-25 | [
[
"Kneur",
"J. -L.",
""
],
[
"Moultaka",
"G.",
""
]
] | We examine the possibility of recovering the supersymmetric (and soft supersymmetry breaking) Lagrangian parameters as direct {\em analytical} expressions of appropriate physical masses, for the unconstrained (but CP and R-parity conserving) minimal supersymmetric standard model. We concentrate mainly on the algebraically non-trivial "inversion" for the ino parameters, and obtain, for given values of $\tan\beta$, simple analytical expressions for the $\mu$, $M_1$ and $M_2$ parameters in terms of three arbitrary input physical masses, namely either two chargino and one neutralino masses, or alternatively one chargino and two neutralino masses. We illustrate and discuss in detail the possible occurrence of ambiguities in this reconstruction. The dependence of the resulting ino Lagrangian parameters upon physical masses is illustrated, and some simple generic behaviour uncovered in this way. We finally briefly sketch generalizing such an inversion to the full set of MSSM Lagrangian parameters. |
1809.04934 | Gang Li | Chun-Sheng An, Ju-Jun Xie, Gang Li | Decay patterns of low-lying $N_{s\bar{s}}$ states to the strangeness
channels | 17 pages, 2 figures | null | 10.1103/PhysRevC.98.045201 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Here we investigate the decay patterns of the low-lying hidden strangeness
nucleon resonances ($\equiv N_{s\bar{s}}$) to the strangeness channels by
employing the chiral Lagrangian approach, where the $N_{s\bar{s}}$ states are
treated as compact pentaquark states. The $S$-wave decays of these states to
the $PB$ (pseudoscalar meson and baryon) and $VB$ (vector meson and baryon)
channels are studied. According to the obtained masses and decay properties, we
find four states, namely, $N_{s\bar{s}}(1874)$ with quantum numbers
$I(J^{P})=1/2(1/2^{-})$, $N_{s\bar{s}}(1885)$ with $I(J^{P})=1/2(3/2^{-})$,
$N_{s\bar{s}}(2327)$ with $I(J^{P})=1/2(1/2^{-})$, and $N_{s\bar{s}}(2252)$
with $I(J^{P})=1/2(3/2^{-})$, may be associated to the well established nucleon
resonances $N^*(1895)$, $N^{*}(1875)$, and the newly predicted $N^{*}(2355)$
and $N^{*}(2250)$ by CLAS collaboration, respectively. In addition, several
other obtained hidden strangeness nucleon resonances may be expected to be
dominant components of the predicted missing resonances in the literatures.
| [
{
"created": "Thu, 13 Sep 2018 13:22:18 GMT",
"version": "v1"
}
] | 2018-11-14 | [
[
"An",
"Chun-Sheng",
""
],
[
"Xie",
"Ju-Jun",
""
],
[
"Li",
"Gang",
""
]
] | Here we investigate the decay patterns of the low-lying hidden strangeness nucleon resonances ($\equiv N_{s\bar{s}}$) to the strangeness channels by employing the chiral Lagrangian approach, where the $N_{s\bar{s}}$ states are treated as compact pentaquark states. The $S$-wave decays of these states to the $PB$ (pseudoscalar meson and baryon) and $VB$ (vector meson and baryon) channels are studied. According to the obtained masses and decay properties, we find four states, namely, $N_{s\bar{s}}(1874)$ with quantum numbers $I(J^{P})=1/2(1/2^{-})$, $N_{s\bar{s}}(1885)$ with $I(J^{P})=1/2(3/2^{-})$, $N_{s\bar{s}}(2327)$ with $I(J^{P})=1/2(1/2^{-})$, and $N_{s\bar{s}}(2252)$ with $I(J^{P})=1/2(3/2^{-})$, may be associated to the well established nucleon resonances $N^*(1895)$, $N^{*}(1875)$, and the newly predicted $N^{*}(2355)$ and $N^{*}(2250)$ by CLAS collaboration, respectively. In addition, several other obtained hidden strangeness nucleon resonances may be expected to be dominant components of the predicted missing resonances in the literatures. |
1310.6192 | Ning Liu | Ning Liu, Jie Ren, Bingfang Yang | Next-to-leading order QCD corrections to $HZW^{\pm}$ production at 14
TeV LHC | discussions added, accepted by Physics Letters B | null | 10.1016/j.physletb.2014.02.023 | null | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Since the precise study of Higgs gauge couplings is important to test the
Standard Model (SM), we calculate the complete next-to-leading order QCD(NLO
QCD) correction to the $pp \to HZW^{\pm}$ production in the SM at 14 TeV LHC.
Our results show that the NLO QCD correction can enhance the leading-order
cross section of $pp \to HZW^{\pm}$ by 45%, when $ m_H $ = 125.3 GeV. We also
study the dependence of the LO and NLO corrected cross sections on the
renormalization and factorization scale $\mu$. Besides, due to the unbalance of
parton distribution functions, we investigate the charge asymmetry of $W^{\pm}$
in the production of $pp\to HZW^{\pm}$, which can reach 32.94% for
$\mu=(m_H+m_Z+m_W)/2$ at 14 TeV LHC.
| [
{
"created": "Wed, 23 Oct 2013 11:46:17 GMT",
"version": "v1"
},
{
"created": "Thu, 12 Dec 2013 03:09:10 GMT",
"version": "v2"
},
{
"created": "Tue, 11 Feb 2014 10:20:55 GMT",
"version": "v3"
}
] | 2015-06-17 | [
[
"Liu",
"Ning",
""
],
[
"Ren",
"Jie",
""
],
[
"Yang",
"Bingfang",
""
]
] | Since the precise study of Higgs gauge couplings is important to test the Standard Model (SM), we calculate the complete next-to-leading order QCD(NLO QCD) correction to the $pp \to HZW^{\pm}$ production in the SM at 14 TeV LHC. Our results show that the NLO QCD correction can enhance the leading-order cross section of $pp \to HZW^{\pm}$ by 45%, when $ m_H $ = 125.3 GeV. We also study the dependence of the LO and NLO corrected cross sections on the renormalization and factorization scale $\mu$. Besides, due to the unbalance of parton distribution functions, we investigate the charge asymmetry of $W^{\pm}$ in the production of $pp\to HZW^{\pm}$, which can reach 32.94% for $\mu=(m_H+m_Z+m_W)/2$ at 14 TeV LHC. |
1805.08231 | Daniel Camargo D. A. Camargo | Daniel A. Camargo, Luigi Delle Rose, Stefano Moretti and Farinaldo S.
Queiroz | Collider Bounds on 2-Higgs Doublet Models with $U(1)_X$ Gauge Symmetries | 13 pages, 21 figures | null | 10.1016/j.physletb.2019.04.048 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | 2-Higgs Doublet Models (2HDMs) typically need to invoke an ad-hoc discrete
symmetry to avoid severe flavor bounds and in addition feature massless
neutrinos, thus falling short of naturally complying with existing data.
However, when augmented by an Abelian gauge symmetry naturally incorporating
neutrino masses via a type-I seesaw mechanism while at the same time escaping
flavor changing interactions, such enlarged 2HDMs become very attractive
phenomenologically. In such frameworks, the distinctive element is the $Z'$
gauge boson generated by the spontaneous breaking of the Abelian group
$U(1)_X$. In this work, we derive updated collider bounds on it. Several
theoretical setups are possible, each with different and sometimes suppressed
couplings to quarks and leptons. Thus, complementary data from dijet and
dilepton resonance searches need to be considered to fully probe these objects.
We employ the corresponding datasets as obtained at the Large Hadron Collider
(LHC) at the 13 TeV CMs energy for $\mathcal{L}=12,36$ and $300$ fb$^{-1}$ of
luminosity. Moreover, we present the potential sensitivity to such $Z'$s of the
High Luminosity LHC (HL-LHC) and High Energy LHC (HE-LHC).
| [
{
"created": "Mon, 21 May 2018 18:02:52 GMT",
"version": "v1"
}
] | 2019-04-24 | [
[
"Camargo",
"Daniel A.",
""
],
[
"Rose",
"Luigi Delle",
""
],
[
"Moretti",
"Stefano",
""
],
[
"Queiroz",
"Farinaldo S.",
""
]
] | 2-Higgs Doublet Models (2HDMs) typically need to invoke an ad-hoc discrete symmetry to avoid severe flavor bounds and in addition feature massless neutrinos, thus falling short of naturally complying with existing data. However, when augmented by an Abelian gauge symmetry naturally incorporating neutrino masses via a type-I seesaw mechanism while at the same time escaping flavor changing interactions, such enlarged 2HDMs become very attractive phenomenologically. In such frameworks, the distinctive element is the $Z'$ gauge boson generated by the spontaneous breaking of the Abelian group $U(1)_X$. In this work, we derive updated collider bounds on it. Several theoretical setups are possible, each with different and sometimes suppressed couplings to quarks and leptons. Thus, complementary data from dijet and dilepton resonance searches need to be considered to fully probe these objects. We employ the corresponding datasets as obtained at the Large Hadron Collider (LHC) at the 13 TeV CMs energy for $\mathcal{L}=12,36$ and $300$ fb$^{-1}$ of luminosity. Moreover, we present the potential sensitivity to such $Z'$s of the High Luminosity LHC (HL-LHC) and High Energy LHC (HE-LHC). |
0707.1948 | Tomohiro Matsuda | Tomohiro Matsuda | NO Curvatons or Hybrid Quintessential Inflation | 12 pages, no figure, added references | JCAP0708:003,2007 | 10.1088/1475-7516/2007/08/003 | null | hep-ph astro-ph hep-th | null | We consider a curvaton scenario in which the late-time domination and the
generation of the curvature perturbation is achieved by a non-oscillatory (NO)
curvaton potential. Instead of considering the conventional curvaton
oscillation, we consider ``weak trapping'' after preheating, which modifies the
evolution of the curvaton density after preheating. The primordial isocurvature
perturbation related to the curvaton is once converted into the fluctuation of
the number density of the preheat field through inhomogeneous preheating. Then
the evolution of the curvatons and the preheat field is controlled by the
preheat-field number density. The density of these fields decreases slightly
slower than the standard matter density which suggests that these fields will
grow with time. Finally, the preheat field decays to reheat the Universe
leaving behind the curvature perturbation. In our scenario the task of the
standard curvaton is not executed solely by the curvaton itself but is
partially shared with the preheat field. NO curvatons can be considered as the
hybrid version of the quintessential inflationary model.
| [
{
"created": "Fri, 13 Jul 2007 09:22:20 GMT",
"version": "v1"
},
{
"created": "Sun, 15 Jul 2007 06:06:30 GMT",
"version": "v2"
},
{
"created": "Fri, 27 Jul 2007 14:43:45 GMT",
"version": "v3"
}
] | 2008-11-26 | [
[
"Matsuda",
"Tomohiro",
""
]
] | We consider a curvaton scenario in which the late-time domination and the generation of the curvature perturbation is achieved by a non-oscillatory (NO) curvaton potential. Instead of considering the conventional curvaton oscillation, we consider ``weak trapping'' after preheating, which modifies the evolution of the curvaton density after preheating. The primordial isocurvature perturbation related to the curvaton is once converted into the fluctuation of the number density of the preheat field through inhomogeneous preheating. Then the evolution of the curvatons and the preheat field is controlled by the preheat-field number density. The density of these fields decreases slightly slower than the standard matter density which suggests that these fields will grow with time. Finally, the preheat field decays to reheat the Universe leaving behind the curvature perturbation. In our scenario the task of the standard curvaton is not executed solely by the curvaton itself but is partially shared with the preheat field. NO curvatons can be considered as the hybrid version of the quintessential inflationary model. |
hep-ph/9708487 | null | P. Ackerbauer, D.V. Balin, V.M. Baturin, G.A. Beer, W.H. Breunlich, T.
Case, K. Crowe, H. Daniel, J. Deutsch, J. Govaerts, Yu.S. Grigoriev, F.J.
Hartmann, P. Kammel, R. King, B. Lauss, E.M. Maev, V.E. Markushin, J. Marton,
M. Muehlbauer, C. Petitjean, Th. Petitjean, G.E. Petrov, R. Prieels, W.
Prymas, W. Schott, G.G. Semenchuk, Yu.V. Smirenin, A.A. Vorobyov, N.I.
Voropaev, P. Wojciechowski (IMEP, Wien & PNPI, Gatchina & Catholic U. of
Louvain & PSI & Technical U. of Munich & UCB and LBL & Kurchatov, Moscow & U.
of Victoria) | A Precision Measurement of Nuclear Muon Capture on 3He | 13 pages, 6 PostScript figures | Phys.Lett.B417:224-232,1998 | 10.1016/S0370-2693(97)01382-8 | PSI-PR-97-21 | hep-ph nucl-ex | null | The muon capture rate in the reaction mu- 3He -> nu + 3H has been measured at
PSI using a modular high pressure ionization chamber. The rate corresponding to
statistical hyperfine population of the mu-3He atom is (1496.0 +- 4.0) s^-1.
This result confirms the PCAC prediction for the pseudoscalar form factors of
the 3He-3H system and the nucleon.
| [
{
"created": "Fri, 29 Aug 1997 08:54:44 GMT",
"version": "v1"
}
] | 2011-09-12 | [
[
"Ackerbauer",
"P.",
"",
"IMEP, Wien & PNPI, Gatchina & Catholic U. of\n Louvain & PSI & Technical U. of Munich & UCB and LBL & Kurchatov, Moscow & U.\n of Victoria"
],
[
"Balin",
"D. V.",
"",
"IMEP, Wien & PNPI, Gatchina & Catholic U. of\n Louvain & PSI & Technical U. of Munich & UCB and LBL & Kurchatov, Moscow & U.\n of Victoria"
],
[
"Baturin",
"V. M.",
"",
"IMEP, Wien & PNPI, Gatchina & Catholic U. of\n Louvain & PSI & Technical U. of Munich & UCB and LBL & Kurchatov, Moscow & U.\n of Victoria"
],
[
"Beer",
"G. A.",
"",
"IMEP, Wien & PNPI, Gatchina & Catholic U. of\n Louvain & PSI & Technical U. of Munich & UCB and LBL & Kurchatov, Moscow & U.\n of Victoria"
],
[
"Breunlich",
"W. H.",
"",
"IMEP, Wien & PNPI, Gatchina & Catholic U. of\n Louvain & PSI & Technical U. of Munich & UCB and LBL & Kurchatov, Moscow & U.\n of Victoria"
],
[
"Case",
"T.",
"",
"IMEP, Wien & PNPI, Gatchina & Catholic U. of\n Louvain & PSI & Technical U. of Munich & UCB and LBL & Kurchatov, Moscow & U.\n of Victoria"
],
[
"Crowe",
"K.",
"",
"IMEP, Wien & PNPI, Gatchina & Catholic U. of\n Louvain & PSI & Technical U. of Munich & UCB and LBL & Kurchatov, Moscow & U.\n of Victoria"
],
[
"Daniel",
"H.",
"",
"IMEP, Wien & PNPI, Gatchina & Catholic U. of\n Louvain & PSI & Technical U. of Munich & UCB and LBL & Kurchatov, Moscow & U.\n of Victoria"
],
[
"Deutsch",
"J.",
"",
"IMEP, Wien & PNPI, Gatchina & Catholic U. of\n Louvain & PSI & Technical U. of Munich & UCB and LBL & Kurchatov, Moscow & U.\n of Victoria"
],
[
"Govaerts",
"J.",
"",
"IMEP, Wien & PNPI, Gatchina & Catholic U. of\n Louvain & PSI & Technical U. of Munich & UCB and LBL & Kurchatov, Moscow & U.\n of Victoria"
],
[
"Grigoriev",
"Yu. S.",
"",
"IMEP, Wien & PNPI, Gatchina & Catholic U. of\n Louvain & PSI & Technical U. of Munich & UCB and LBL & Kurchatov, Moscow & U.\n of Victoria"
],
[
"Hartmann",
"F. J.",
"",
"IMEP, Wien & PNPI, Gatchina & Catholic U. of\n Louvain & PSI & Technical U. of Munich & UCB and LBL & Kurchatov, Moscow & U.\n of Victoria"
],
[
"Kammel",
"P.",
"",
"IMEP, Wien & PNPI, Gatchina & Catholic U. of\n Louvain & PSI & Technical U. of Munich & UCB and LBL & Kurchatov, Moscow & U.\n of Victoria"
],
[
"King",
"R.",
"",
"IMEP, Wien & PNPI, Gatchina & Catholic U. of\n Louvain & PSI & Technical U. of Munich & UCB and LBL & Kurchatov, Moscow & U.\n of Victoria"
],
[
"Lauss",
"B.",
"",
"IMEP, Wien & PNPI, Gatchina & Catholic U. of\n Louvain & PSI & Technical U. of Munich & UCB and LBL & Kurchatov, Moscow & U.\n of Victoria"
],
[
"Maev",
"E. M.",
"",
"IMEP, Wien & PNPI, Gatchina & Catholic U. of\n Louvain & PSI & Technical U. of Munich & UCB and LBL & Kurchatov, Moscow & U.\n of Victoria"
],
[
"Markushin",
"V. E.",
"",
"IMEP, Wien & PNPI, Gatchina & Catholic U. of\n Louvain & PSI & Technical U. of Munich & UCB and LBL & Kurchatov, Moscow & U.\n of Victoria"
],
[
"Marton",
"J.",
"",
"IMEP, Wien & PNPI, Gatchina & Catholic U. of\n Louvain & PSI & Technical U. of Munich & UCB and LBL & Kurchatov, Moscow & U.\n of Victoria"
],
[
"Muehlbauer",
"M.",
"",
"IMEP, Wien & PNPI, Gatchina & Catholic U. of\n Louvain & PSI & Technical U. of Munich & UCB and LBL & Kurchatov, Moscow & U.\n of Victoria"
],
[
"Petitjean",
"C.",
"",
"IMEP, Wien & PNPI, Gatchina & Catholic U. of\n Louvain & PSI & Technical U. of Munich & UCB and LBL & Kurchatov, Moscow & U.\n of Victoria"
],
[
"Petitjean",
"Th.",
"",
"IMEP, Wien & PNPI, Gatchina & Catholic U. of\n Louvain & PSI & Technical U. of Munich & UCB and LBL & Kurchatov, Moscow & U.\n of Victoria"
],
[
"Petrov",
"G. E.",
"",
"IMEP, Wien & PNPI, Gatchina & Catholic U. of\n Louvain & PSI & Technical U. of Munich & UCB and LBL & Kurchatov, Moscow & U.\n of Victoria"
],
[
"Prieels",
"R.",
"",
"IMEP, Wien & PNPI, Gatchina & Catholic U. of\n Louvain & PSI & Technical U. of Munich & UCB and LBL & Kurchatov, Moscow & U.\n of Victoria"
],
[
"Prymas",
"W.",
"",
"IMEP, Wien & PNPI, Gatchina & Catholic U. of\n Louvain & PSI & Technical U. of Munich & UCB and LBL & Kurchatov, Moscow & U.\n of Victoria"
],
[
"Schott",
"W.",
"",
"IMEP, Wien & PNPI, Gatchina & Catholic U. of\n Louvain & PSI & Technical U. of Munich & UCB and LBL & Kurchatov, Moscow & U.\n of Victoria"
],
[
"Semenchuk",
"G. G.",
"",
"IMEP, Wien & PNPI, Gatchina & Catholic U. of\n Louvain & PSI & Technical U. of Munich & UCB and LBL & Kurchatov, Moscow & U.\n of Victoria"
],
[
"Smirenin",
"Yu. V.",
"",
"IMEP, Wien & PNPI, Gatchina & Catholic U. of\n Louvain & PSI & Technical U. of Munich & UCB and LBL & Kurchatov, Moscow & U.\n of Victoria"
],
[
"Vorobyov",
"A. A.",
"",
"IMEP, Wien & PNPI, Gatchina & Catholic U. of\n Louvain & PSI & Technical U. of Munich & UCB and LBL & Kurchatov, Moscow & U.\n of Victoria"
],
[
"Voropaev",
"N. I.",
"",
"IMEP, Wien & PNPI, Gatchina & Catholic U. of\n Louvain & PSI & Technical U. of Munich & UCB and LBL & Kurchatov, Moscow & U.\n of Victoria"
],
[
"Wojciechowski",
"P.",
"",
"IMEP, Wien & PNPI, Gatchina & Catholic U. of\n Louvain & PSI & Technical U. of Munich & UCB and LBL & Kurchatov, Moscow & U.\n of Victoria"
]
] | The muon capture rate in the reaction mu- 3He -> nu + 3H has been measured at PSI using a modular high pressure ionization chamber. The rate corresponding to statistical hyperfine population of the mu-3He atom is (1496.0 +- 4.0) s^-1. This result confirms the PCAC prediction for the pseudoscalar form factors of the 3He-3H system and the nucleon. |
hep-ph/9603317 | Shinta Kasuya | Shinta Kasuya and Masahiro Kawasaki | Restriction to Parametric Resonant Decay after Inflation | 10 pages, LaTeX 2e. Journal version | Phys.Lett. B388 (1996) 686-691 | 10.1016/S0370-2693(96)01216-6 | ICRR-Report-360-96-11 | hep-ph | null | We study parametric resonant decay of inflaton field with emphasis on its
physical meaning. We show that the parametric resonance is indeed an induced
process, which means that the more numbers of produced particles, the more
inflaton field decays. We also consider the dissipative effects of produced
particles and find that the dissipation reduces the resonant decay rate of
inflaton field.
| [
{
"created": "Fri, 15 Mar 1996 09:07:10 GMT",
"version": "v1"
},
{
"created": "Tue, 19 Mar 1996 03:03:39 GMT",
"version": "v2"
},
{
"created": "Fri, 14 Mar 1997 06:28:42 GMT",
"version": "v3"
}
] | 2009-10-28 | [
[
"Kasuya",
"Shinta",
""
],
[
"Kawasaki",
"Masahiro",
""
]
] | We study parametric resonant decay of inflaton field with emphasis on its physical meaning. We show that the parametric resonance is indeed an induced process, which means that the more numbers of produced particles, the more inflaton field decays. We also consider the dissipative effects of produced particles and find that the dissipation reduces the resonant decay rate of inflaton field. |
hep-ph/0606119 | Patrick Huber | P. Huber, M. Lindner, M. Rolinec, W. Winter | Optimization of a neutrino factory oscillation experiment | 51 pages, 25 figures, 6 tables, references corrected, final version
to appear in Phys. Rev. D | Phys.Rev.D74:073003,2006 | 10.1103/PhysRevD.74.073003 | null | hep-ph hep-ex | null | We discuss the optimization of a neutrino factory experiment for neutrino
oscillation physics in terms of muon energy, baselines, and oscillation
channels (gold, silver, platinum). In addition, we study the impact and
requirements for detector technology improvements, and we compare the results
to beta beams. We find that the optimized neutrino factory has two baselines,
one at about 3000 to 5000km, the other at about 7500km (``magic'' baseline).
The threshold and energy resolution of the golden channel detector have the
most promising optimization potential. This, in turn, could be used to lower
the muon energy from about 50GeV to about 20GeV. Furthermore, the inclusion of
electron neutrino appearance with charge identification (platinum channel)
could help for large values of \sin^2 2 \theta_{13}. Though tau neutrino
appearance with charge identification (silver channel) helps, in principle, to
resolve degeneracies for intermediate \sin^2 2 \theta_{13}, we find that
alternative strategies may be more feasible in this parameter range. As far as
matter density uncertainties are concerned, we demonstrate that their impact
can be reduced by the combination of different baselines and channels. Finally,
in comparison to beta beams and other alternative technologies, we clearly can
establish a superior performance for a neutrino factory in the case \sin^2 2
\theta_{13} < 0.01.
| [
{
"created": "Mon, 12 Jun 2006 15:41:01 GMT",
"version": "v1"
},
{
"created": "Wed, 12 Jul 2006 15:47:16 GMT",
"version": "v2"
},
{
"created": "Fri, 29 Sep 2006 18:43:39 GMT",
"version": "v3"
}
] | 2014-11-18 | [
[
"Huber",
"P.",
""
],
[
"Lindner",
"M.",
""
],
[
"Rolinec",
"M.",
""
],
[
"Winter",
"W.",
""
]
] | We discuss the optimization of a neutrino factory experiment for neutrino oscillation physics in terms of muon energy, baselines, and oscillation channels (gold, silver, platinum). In addition, we study the impact and requirements for detector technology improvements, and we compare the results to beta beams. We find that the optimized neutrino factory has two baselines, one at about 3000 to 5000km, the other at about 7500km (``magic'' baseline). The threshold and energy resolution of the golden channel detector have the most promising optimization potential. This, in turn, could be used to lower the muon energy from about 50GeV to about 20GeV. Furthermore, the inclusion of electron neutrino appearance with charge identification (platinum channel) could help for large values of \sin^2 2 \theta_{13}. Though tau neutrino appearance with charge identification (silver channel) helps, in principle, to resolve degeneracies for intermediate \sin^2 2 \theta_{13}, we find that alternative strategies may be more feasible in this parameter range. As far as matter density uncertainties are concerned, we demonstrate that their impact can be reduced by the combination of different baselines and channels. Finally, in comparison to beta beams and other alternative technologies, we clearly can establish a superior performance for a neutrino factory in the case \sin^2 2 \theta_{13} < 0.01. |
hep-ph/0307103 | Edward Shuryak | Edward V.Shuryak and Ismail Zahed | Understanding the Non-Perturbative Deep-Inelastic Scattering:
Instanton-induced Inelastic Dipole-Dipole Cross Section | Version 2 adds few references and their discussion, streamline the
introduction and correct some numerical errors in the plots. All formulae and
conclusions are not changed | Phys.Rev. D69 (2004) 014011 | 10.1103/PhysRevD.69.014011 | null | hep-ph | null | We derive the semiclassical (instanton-induced) contribution to the inelastic
cross section of two color dipoles at large $\sqrt{s}$. We study its dependence
on the dipole sizes, orientations and, most importantly, the impact parameter.
The inelastic cross section is approximately quadratic in the dipole sizes, and
Gaussian-like in the impact parameter with a width of the order of the
instanton size. These results are directly relevant to double DIS
$\gamma^*\gamma^*$, as well as $\gamma^*\gamma$ and standard DIS $\gamma^* h$
at small x when a real photon and a hadron can be approximated by a dipole. For
such cases, with one small dipole scattering on a large dipole, the impact
parameter profile exhibits a width of about 1/2 fm, which is in good agreement
with the impact parameter profile recently extracted from DIS HERA data,
including diffractive $\gamma^*\to J/\psi$.
| [
{
"created": "Mon, 7 Jul 2003 22:23:42 GMT",
"version": "v1"
},
{
"created": "Wed, 27 Aug 2003 18:07:29 GMT",
"version": "v2"
}
] | 2009-11-10 | [
[
"Shuryak",
"Edward V.",
""
],
[
"Zahed",
"Ismail",
""
]
] | We derive the semiclassical (instanton-induced) contribution to the inelastic cross section of two color dipoles at large $\sqrt{s}$. We study its dependence on the dipole sizes, orientations and, most importantly, the impact parameter. The inelastic cross section is approximately quadratic in the dipole sizes, and Gaussian-like in the impact parameter with a width of the order of the instanton size. These results are directly relevant to double DIS $\gamma^*\gamma^*$, as well as $\gamma^*\gamma$ and standard DIS $\gamma^* h$ at small x when a real photon and a hadron can be approximated by a dipole. For such cases, with one small dipole scattering on a large dipole, the impact parameter profile exhibits a width of about 1/2 fm, which is in good agreement with the impact parameter profile recently extracted from DIS HERA data, including diffractive $\gamma^*\to J/\psi$. |
hep-ph/9612321 | A. Kundu | Ambar Ghosal, Anirban Kundu and Biswarup Mukhopadhyaya | Probing Gauge-Mediated Supersymmetry Breaking Through Polarized Electron
Beams in an $e^+e^-$ Collider | Plain LaTeX file, with four postscript figures added | Phys.Rev. D56 (1997) 504-507 | 10.1103/PhysRevD.56.504 | MRI-PHY/96-36 | hep-ph | null | Using the facts that in Gauge-Mediated Supersymmetry Breaking schemes, masses
of the right and the left sfermions can differ widely, and the gravitino is the
Lightest Supersymmetric Particle, we show that it is possible to obtain
unambiguous signatures of such schemes in a high energy $e^+e^-$ collider if
one looks at the asymmetries in the cross-sections for certain final states
with left-and right-polarized beams.
| [
{
"created": "Wed, 11 Dec 1996 07:52:06 GMT",
"version": "v1"
}
] | 2009-10-30 | [
[
"Ghosal",
"Ambar",
""
],
[
"Kundu",
"Anirban",
""
],
[
"Mukhopadhyaya",
"Biswarup",
""
]
] | Using the facts that in Gauge-Mediated Supersymmetry Breaking schemes, masses of the right and the left sfermions can differ widely, and the gravitino is the Lightest Supersymmetric Particle, we show that it is possible to obtain unambiguous signatures of such schemes in a high energy $e^+e^-$ collider if one looks at the asymmetries in the cross-sections for certain final states with left-and right-polarized beams. |
hep-ph/0506331 | Victor Goncalves | V. P. Goncalves, M. V. T. Machado | Vector Meson Production in Ultraperipheral Heavy Ion Collisions | 16 pages, 1 figure. Version to be published in Journal of Physics G:
Nuclear and Particle Physics | J.Phys. G32 (2006) 295-308 | 10.1088/0954-3899/32/3/005 | null | hep-ph hep-ex nucl-th | null | The ultraperipheral heavy ion collisions (UPC's) are an important alternative
to study the QCD dynamics until the next generation of $e^+e^-/ ep / eA $
colliders become reality. Due to the coherent action of all the protons in the
nucleus, the electromagnetic field is very strong and the resulting flux of
equivalent photons is large, which allows to study two-photon as well as
photonuclear interactions at high energies. In this paper we present a brief
review of the vector meson production in UPC's at high energies using the QCD
color dipole approach to describe their photonuclear production and the
perturbative QCD Pomeron (BFKL dynamics) to describe the double meson
production in photon-photon process. Predictions for rates and integrated cross
sections are presented for energies of RHIC and LHC.
| [
{
"created": "Thu, 30 Jun 2005 15:38:59 GMT",
"version": "v1"
},
{
"created": "Wed, 21 Dec 2005 16:30:40 GMT",
"version": "v2"
}
] | 2009-11-11 | [
[
"Goncalves",
"V. P.",
""
],
[
"Machado",
"M. V. T.",
""
]
] | The ultraperipheral heavy ion collisions (UPC's) are an important alternative to study the QCD dynamics until the next generation of $e^+e^-/ ep / eA $ colliders become reality. Due to the coherent action of all the protons in the nucleus, the electromagnetic field is very strong and the resulting flux of equivalent photons is large, which allows to study two-photon as well as photonuclear interactions at high energies. In this paper we present a brief review of the vector meson production in UPC's at high energies using the QCD color dipole approach to describe their photonuclear production and the perturbative QCD Pomeron (BFKL dynamics) to describe the double meson production in photon-photon process. Predictions for rates and integrated cross sections are presented for energies of RHIC and LHC. |
1205.6207 | Marco Serone | Marco Serone | On the Cut-off Estimate in Lifshitz Five Dimensional Field Theories | 18 pages, one appendix; v2: minor improvements, to appear in Phys.
Rev. D; v3: one typo fixed, incorrect argument at the end of section 5
removed, acknowledgments added, conclusions unchanged, supersedes published
version v2 | null | 10.1103/PhysRevD.86.046002 | SISSA-13/2012/EP | hep-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We analyze if and to what extent the high energy behaviour of
five-dimensional (5D) gauge theories can be improved by adding certain higher
dimensional operators of "Lifshitz" type, without breaking the ordinary
four-dimensional Lorentz symmetries. We show that the UV behaviour of the
transverse gauge field polarizations can be improved by the Lifshitz operators,
while the longitudinal polarizations get strongly coupled at energies lower
than the ones in ordinary 5D theories, spoiling the usefulness of the
construction in non-abelian gauge theories. We conclude that the improved
behaviour as effective theories of the ordinary 5D models is not only related
to locality and 5D gauge symmetries, but is a special property of the standard
theories defined by the lowest dimensional operators.
| [
{
"created": "Mon, 28 May 2012 20:02:17 GMT",
"version": "v1"
},
{
"created": "Mon, 30 Jul 2012 09:47:51 GMT",
"version": "v2"
},
{
"created": "Mon, 19 May 2014 07:10:47 GMT",
"version": "v3"
}
] | 2014-05-20 | [
[
"Serone",
"Marco",
""
]
] | We analyze if and to what extent the high energy behaviour of five-dimensional (5D) gauge theories can be improved by adding certain higher dimensional operators of "Lifshitz" type, without breaking the ordinary four-dimensional Lorentz symmetries. We show that the UV behaviour of the transverse gauge field polarizations can be improved by the Lifshitz operators, while the longitudinal polarizations get strongly coupled at energies lower than the ones in ordinary 5D theories, spoiling the usefulness of the construction in non-abelian gauge theories. We conclude that the improved behaviour as effective theories of the ordinary 5D models is not only related to locality and 5D gauge symmetries, but is a special property of the standard theories defined by the lowest dimensional operators. |
hep-ph/0605268 | Kyle S. Cranmer | Kyle Cranmer and Tilman Plehn | Maximum Significance at the LHC and Higgs Decays to Muons | 7 pages, 2 figures, changes to wording and new references, published
version | Eur.Phys.J.C51:415-420,2007 | 10.1140/epjc/s10052-007-0309-4 | MPP-2006-43 | hep-ph | null | We present a new way to define and compute the maximum significance
achievable for signal and background processes at the LHC, using all available
phase space information. As an example, we show that a light Higgs boson
produced in weak--boson fusion with a subsequent decay into muons can be
extracted from the backgrounds. The method, aimed at phenomenological studies,
can be incorporated in parton--level event generators and accommodate
parametric descriptions of detector effects for selected observables.
| [
{
"created": "Wed, 24 May 2006 20:06:17 GMT",
"version": "v1"
},
{
"created": "Fri, 26 May 2006 12:19:29 GMT",
"version": "v2"
},
{
"created": "Fri, 30 Mar 2007 11:18:16 GMT",
"version": "v3"
}
] | 2008-11-26 | [
[
"Cranmer",
"Kyle",
""
],
[
"Plehn",
"Tilman",
""
]
] | We present a new way to define and compute the maximum significance achievable for signal and background processes at the LHC, using all available phase space information. As an example, we show that a light Higgs boson produced in weak--boson fusion with a subsequent decay into muons can be extracted from the backgrounds. The method, aimed at phenomenological studies, can be incorporated in parton--level event generators and accommodate parametric descriptions of detector effects for selected observables. |
hep-ph/0203190 | Li DeMin | De-Min Li, Hong Yu, Qi-Xing Shen | On the mass relation of a meson nonet | Latex, 10 pages, to appear in Mod. Phys. Lett. A | Mod.Phys.Lett. A17 (2002) 163-170 | 10.1142/S0217732302006369 | null | hep-ph | null | It is pointed out that the omission of the effects of the transition between
quarkonia or the assumption that the transition between quarkonia is
flavor-independent would result in the inconsistent results for the
pseudoscalar meson nonet. It is emphasized that the mass relation of the
non-ideal mixing meson nonets should incorporate the effects of the
flavor-dependent transition between quarkonia. The new mass relations of a
meson nonet are presented.
| [
{
"created": "Wed, 20 Mar 2002 05:21:35 GMT",
"version": "v1"
}
] | 2009-11-07 | [
[
"Li",
"De-Min",
""
],
[
"Yu",
"Hong",
""
],
[
"Shen",
"Qi-Xing",
""
]
] | It is pointed out that the omission of the effects of the transition between quarkonia or the assumption that the transition between quarkonia is flavor-independent would result in the inconsistent results for the pseudoscalar meson nonet. It is emphasized that the mass relation of the non-ideal mixing meson nonets should incorporate the effects of the flavor-dependent transition between quarkonia. The new mass relations of a meson nonet are presented. |
hep-ph/0004049 | Sven Bergmann | S. Bergmann, M.M. Guzzo, P.C. de Holanda, P.I. Krastev and H. Nunokawa | Status of the solution to the solar neutrino problem based on
non-standard neutrino interactions | 30 pages, 9 figures, Latex | Phys.Rev. D62 (2000) 073001 | 10.1103/PhysRevD.62.073001 | WIS-5/00/Apr-DPP, MAD-NT/00-04 | hep-ph | null | We analyze the current status of the solution to the solar neutrino problem
based both on: a) non-standard flavor changing neutrino interactions (FCNI) and
b) non-universal flavor diagonal neutrino interactions (FDNI). We find that
FCNI and FDNI with matter in the sun as well as in the earth provide a good fit
not only to the total rate measured by all solar neutrino experiments but also
to the day-night and seasonal variations of the event rate, as well as the
recoil electron energy spectrum measured by the SuperKamiokande collaboration.
This solution does not require massive neutrinos and neutrino mixing in vacuum.
Stringent experimental constraints on FCNI from bounds on lepton flavor
violating decays and on FDNI from limits on lepton universality violation rule
out $\nu_e \to \nu_\mu$ transitions induced by New Physics as a solution to the
solar neutrino problem. However, a solution involving $\nu_e \to \nu_\tau$
transitions is viable and could be tested independently by the upcoming
$B$-factories if flavor violating tau decays would be observed at a rate close
to the present upper bounds.
| [
{
"created": "Thu, 6 Apr 2000 09:44:55 GMT",
"version": "v1"
}
] | 2009-10-31 | [
[
"Bergmann",
"S.",
""
],
[
"Guzzo",
"M. M.",
""
],
[
"de Holanda",
"P. C.",
""
],
[
"Krastev",
"P. I.",
""
],
[
"Nunokawa",
"H.",
""
]
] | We analyze the current status of the solution to the solar neutrino problem based both on: a) non-standard flavor changing neutrino interactions (FCNI) and b) non-universal flavor diagonal neutrino interactions (FDNI). We find that FCNI and FDNI with matter in the sun as well as in the earth provide a good fit not only to the total rate measured by all solar neutrino experiments but also to the day-night and seasonal variations of the event rate, as well as the recoil electron energy spectrum measured by the SuperKamiokande collaboration. This solution does not require massive neutrinos and neutrino mixing in vacuum. Stringent experimental constraints on FCNI from bounds on lepton flavor violating decays and on FDNI from limits on lepton universality violation rule out $\nu_e \to \nu_\mu$ transitions induced by New Physics as a solution to the solar neutrino problem. However, a solution involving $\nu_e \to \nu_\tau$ transitions is viable and could be tested independently by the upcoming $B$-factories if flavor violating tau decays would be observed at a rate close to the present upper bounds. |
2202.04918 | Hua-Xing Chen | Hua-Xing Chen, Niu Su and Shi-Lin Zhu | QCD axial anomaly enhances the $\eta \eta^\prime$ decay of the hybrid
candidate $\eta_1(1855)$ | 8 pages, 2 figures, 1 table, references added, to be published in
Chin. Phys. Lett | Chin. Phys. Lett. 39, 051201 (2022) | 10.1088/0256-307X/39/5/051201 | null | hep-ph hep-ex hep-lat nucl-ex nucl-th | http://creativecommons.org/licenses/by/4.0/ | We study the hybrid mesons with the exotic quantum number $I^GJ^{PC} =
0^+1^{-+}$ and investigate their decays into the $\eta \eta^\prime$, $a_1(1260)
\pi$, $f_1(1285) \eta$, $f_1(1420) \eta$, $K^*(892) \bar K$, $K_1(1270) \bar
K$, and $K_1(1400) \bar K$ channels. We find that the QCD axial anomaly
enhances the decay width of the $\eta \eta^\prime$ channel although this mode
is strongly suppressed by the small $P$-wave phase space. Our results support
the interpretation of the $\eta_1(1855)$ recently observed by BESIII as the
$\bar s s g$ hybrid meson of $I^GJ^{PC}=0^+1^{-+}$. The QCD axial anomaly
ensures the $\eta \eta^\prime$ decay mode to be a characteristic signal of the
hybrid nature of the $\eta_1(1855)$.
| [
{
"created": "Thu, 10 Feb 2022 09:19:24 GMT",
"version": "v1"
},
{
"created": "Fri, 15 Apr 2022 01:39:20 GMT",
"version": "v2"
}
] | 2022-05-12 | [
[
"Chen",
"Hua-Xing",
""
],
[
"Su",
"Niu",
""
],
[
"Zhu",
"Shi-Lin",
""
]
] | We study the hybrid mesons with the exotic quantum number $I^GJ^{PC} = 0^+1^{-+}$ and investigate their decays into the $\eta \eta^\prime$, $a_1(1260) \pi$, $f_1(1285) \eta$, $f_1(1420) \eta$, $K^*(892) \bar K$, $K_1(1270) \bar K$, and $K_1(1400) \bar K$ channels. We find that the QCD axial anomaly enhances the decay width of the $\eta \eta^\prime$ channel although this mode is strongly suppressed by the small $P$-wave phase space. Our results support the interpretation of the $\eta_1(1855)$ recently observed by BESIII as the $\bar s s g$ hybrid meson of $I^GJ^{PC}=0^+1^{-+}$. The QCD axial anomaly ensures the $\eta \eta^\prime$ decay mode to be a characteristic signal of the hybrid nature of the $\eta_1(1855)$. |
2204.10315 | Antonino Marciano | Andrea Addazi, Antonino Marciano, Ant\'onio P. Morais, Roman Pasechnik
and Hao Yang | CDF II $W$-mass anomaly faces first-order electroweak phase transition | 6 pages, 4 figures; references added; discussion extended; full
numerical analysis including one-loop corrections performed in support of
initial claims; two extra figures with parameter scan results and SNR for
LISA added; included an author that, due to an unfortunate editing mistake in
the first version was accidentally not included; conclusions unchanged;
acknowledgments extended | Eur. Phys. J. C (2023) 83: 207 | 10.1140/epjc/s10052-023-11315-2 | CERN-TH-2023-039 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We suggest an appealing strategy to probe a large class of scenarios beyond
the Standard Model simultaneously explaining the recent CDF II measurement of
the $W$ boson mass and predicting first-order phase transitions (FOPT) testable
in future gravitational-wave (GW) experiments. Our analysis deploys
measurements from the GW channels and high energy particle colliders. We
discuss this methodology focusing on the specific example provided by an
extension of the Standard Model of particle physics that incorporates an
additional scalar $\mathrm{SU}(2)_{\rm L}$ triplet coupled to the Higgs boson.
We show that within this scenario a strong electroweak FOPT is naturally
realised consistently with the measured $W$ boson mass-shift. Potentially
observable GW signatures imply the triplet mass scale to be TeV-ish,
consistently with the value preferred by the $W$ mass anomaly. This model can
be tested in future space-based interferometers such as LISA, DECIGO, BBO,
TianQin, TAIJI projects and in future colliders such as FCC, ILC, CEPC.
| [
{
"created": "Thu, 21 Apr 2022 17:51:12 GMT",
"version": "v1"
},
{
"created": "Thu, 28 Apr 2022 17:55:19 GMT",
"version": "v2"
},
{
"created": "Sat, 11 Mar 2023 11:22:49 GMT",
"version": "v3"
}
] | 2023-03-14 | [
[
"Addazi",
"Andrea",
""
],
[
"Marciano",
"Antonino",
""
],
[
"Morais",
"António P.",
""
],
[
"Pasechnik",
"Roman",
""
],
[
"Yang",
"Hao",
""
]
] | We suggest an appealing strategy to probe a large class of scenarios beyond the Standard Model simultaneously explaining the recent CDF II measurement of the $W$ boson mass and predicting first-order phase transitions (FOPT) testable in future gravitational-wave (GW) experiments. Our analysis deploys measurements from the GW channels and high energy particle colliders. We discuss this methodology focusing on the specific example provided by an extension of the Standard Model of particle physics that incorporates an additional scalar $\mathrm{SU}(2)_{\rm L}$ triplet coupled to the Higgs boson. We show that within this scenario a strong electroweak FOPT is naturally realised consistently with the measured $W$ boson mass-shift. Potentially observable GW signatures imply the triplet mass scale to be TeV-ish, consistently with the value preferred by the $W$ mass anomaly. This model can be tested in future space-based interferometers such as LISA, DECIGO, BBO, TianQin, TAIJI projects and in future colliders such as FCC, ILC, CEPC. |
0905.1574 | Eita Nakamura | Koichi Hamaguchi, Kouhei Nakaji and Eita Nakamura | Inverse Problem of Cosmic-Ray Electron/Positron from Dark Matter | 16 pages, 6 figures | Phys.Lett.B680:172-178,2009 | 10.1016/j.physletb.2009.08.044 | UT-09-14, IPMU-09-0060 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We discuss the possibility of solving the inverse problem of the cosmic-ray
electron/positron from decaying/annihilating dark matter, and show simple
analytic formulae to reconstruct the source spectrum of the electron/positron
from the observed flux. We also illustrate our approach by applying the
obtained formula to the just released Fermi data as well as the new HESS data.
| [
{
"created": "Mon, 11 May 2009 09:06:55 GMT",
"version": "v1"
}
] | 2009-10-02 | [
[
"Hamaguchi",
"Koichi",
""
],
[
"Nakaji",
"Kouhei",
""
],
[
"Nakamura",
"Eita",
""
]
] | We discuss the possibility of solving the inverse problem of the cosmic-ray electron/positron from decaying/annihilating dark matter, and show simple analytic formulae to reconstruct the source spectrum of the electron/positron from the observed flux. We also illustrate our approach by applying the obtained formula to the just released Fermi data as well as the new HESS data. |
hep-ph/9601302 | Jack Smith | M. Buza, Y. Matiounine, J. Smith, R. Migneron, W.L. van Neerven | Heavy quark coefficient functions at asymptotic values $Q^2 \gg m^2$ | 56 pages plain LATEX, 11 Postscript figures | Nucl.Phys.B472:611-658,1996 | 10.1016/0550-3213(96)00228-3 | NIKHEF/95-070, ITP-SB-95-59, INLO-PUB-22/95 | hep-ph | null | In this paper we present the analytic form of the heavy-quark coefficient
functions for deep-inelastic lepton-hadron scattering in the kinematical regime
$Q^2 \gg m^2$ . Here $Q^2$ and $m^2$ stand for the masses squared of the
virtual photon and heavy quark respectively. The calculations have been
performed up to next-to-leading order in the strong coupling constant
$\alpha_s$ using operator product expansion techniques. Apart from a check on
earlier calculations, which however are only accessible via large computer
programs, the asymptotic forms of the coefficient functions are useful for
charm production at HERA when the condition $Q^2 \gg m_c^2$ is satisfied.
Furthermore the analytical expressions can also be used when one applies the
variable heavy flavour scheme up to next-to-leading order in $\alpha_s$.
| [
{
"created": "Fri, 19 Jan 1996 19:57:38 GMT",
"version": "v1"
}
] | 2010-04-06 | [
[
"Buza",
"M.",
""
],
[
"Matiounine",
"Y.",
""
],
[
"Smith",
"J.",
""
],
[
"Migneron",
"R.",
""
],
[
"van Neerven",
"W. L.",
""
]
] | In this paper we present the analytic form of the heavy-quark coefficient functions for deep-inelastic lepton-hadron scattering in the kinematical regime $Q^2 \gg m^2$ . Here $Q^2$ and $m^2$ stand for the masses squared of the virtual photon and heavy quark respectively. The calculations have been performed up to next-to-leading order in the strong coupling constant $\alpha_s$ using operator product expansion techniques. Apart from a check on earlier calculations, which however are only accessible via large computer programs, the asymptotic forms of the coefficient functions are useful for charm production at HERA when the condition $Q^2 \gg m_c^2$ is satisfied. Furthermore the analytical expressions can also be used when one applies the variable heavy flavour scheme up to next-to-leading order in $\alpha_s$. |
1806.04483 | Riccardo Torre | Riccardo Torre | Clockwork/Linear Dilaton: Structure and phenomenology | 7 pages, 3 figures, Proceeding of the 53rd Rencontres de Moriond - EW
2018; v2: fixed a problem in the bibtex style leading to wrong arxiv links | null | null | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | I briefly discuss the main phenomenological features and constraints of the
Clockwork/Linear Dilaton (CW/LD) 5D geometry. This contribution is based on the
work of ref. arXiv:1711.08437, to which the reader is referred for an extensive
discussion of the subject and the full list of relevant references. The only
original result of this proceeding is adding the constraint arising from the
CMS analysis CMS-PAS-EXO-17-017 to the summary plot.
| [
{
"created": "Tue, 12 Jun 2018 13:10:14 GMT",
"version": "v1"
},
{
"created": "Wed, 27 Jun 2018 12:29:02 GMT",
"version": "v2"
}
] | 2018-06-28 | [
[
"Torre",
"Riccardo",
""
]
] | I briefly discuss the main phenomenological features and constraints of the Clockwork/Linear Dilaton (CW/LD) 5D geometry. This contribution is based on the work of ref. arXiv:1711.08437, to which the reader is referred for an extensive discussion of the subject and the full list of relevant references. The only original result of this proceeding is adding the constraint arising from the CMS analysis CMS-PAS-EXO-17-017 to the summary plot. |
hep-ph/9908335 | Bilenky Samoil M. | S.M. Bilenky | Early years of neutrino oscillations | 10 pages | null | null | null | hep-ph | null | The first papers on neutrino oscillations are shortly reviewed.
| [
{
"created": "Thu, 12 Aug 1999 12:39:32 GMT",
"version": "v1"
},
{
"created": "Mon, 20 Sep 1999 15:39:15 GMT",
"version": "v2"
}
] | 2007-05-23 | [
[
"Bilenky",
"S. M.",
""
]
] | The first papers on neutrino oscillations are shortly reviewed. |
1209.2746 | Dmitry Borisyuk | Dmitry Borisyuk and Alexander Kobushkin | TPEcalc: a program for calculation of two-photon exchange amplitudes | 8 pages, no figures. Update for new version, which supports any
spin-1/2 or spin-3/2 intermediate states | null | null | null | hep-ph nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | TPEcalc is a C++ program for calculation of two-photon exchange (TPE)
amplitudes in elastic electron-hadron scattering, based on the dispersion
method. It is a command-line tool which accepts kinematical parameters (Q^2 and
epsilon) as input and returns TPE amplitudes. It can do calculations for
proton, neutron and pion targets. Any spin 1/2+ or spin 0- target is supported,
if the user supplies all necessary form factor parameterizations. This paper
describes how to use TPEcalc and outlines underlying theory. The program source
code can be downloaded from http://tpe.bitp.kiev.ua/
| [
{
"created": "Wed, 12 Sep 2012 22:18:28 GMT",
"version": "v1"
},
{
"created": "Wed, 3 Jun 2015 11:37:53 GMT",
"version": "v2"
}
] | 2015-06-04 | [
[
"Borisyuk",
"Dmitry",
""
],
[
"Kobushkin",
"Alexander",
""
]
] | TPEcalc is a C++ program for calculation of two-photon exchange (TPE) amplitudes in elastic electron-hadron scattering, based on the dispersion method. It is a command-line tool which accepts kinematical parameters (Q^2 and epsilon) as input and returns TPE amplitudes. It can do calculations for proton, neutron and pion targets. Any spin 1/2+ or spin 0- target is supported, if the user supplies all necessary form factor parameterizations. This paper describes how to use TPEcalc and outlines underlying theory. The program source code can be downloaded from http://tpe.bitp.kiev.ua/ |
hep-ph/0003148 | Hubert Spiesberger | H.Spiesberger and P.M.Zerwas | Gluon Fragmentation to Gluonium | 6 pages with 2 figures, LaTeX | Phys.Lett. B481 (2000) 236-238 | 10.1016/S0370-2693(00)00449-4 | DESY 00-044, Mainz MZ-TH/00-09 | hep-ph | null | The fragmentation of gluons to gluonium states is analyzed qualitatively in
the non-perturbative region. The convolution of this mechanism with
perturbative gluon radiation leaves us with a hard component in the
fragmentation of gluon to gluonium.
| [
{
"created": "Wed, 15 Mar 2000 15:27:12 GMT",
"version": "v1"
}
] | 2009-10-31 | [
[
"Spiesberger",
"H.",
""
],
[
"Zerwas",
"P. M.",
""
]
] | The fragmentation of gluons to gluonium states is analyzed qualitatively in the non-perturbative region. The convolution of this mechanism with perturbative gluon radiation leaves us with a hard component in the fragmentation of gluon to gluonium. |
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