id stringlengths 9 14 | submitter stringlengths 1 56 ⌀ | authors stringlengths 5 7.68k | title stringlengths 3 299 | comments stringlengths 1 1.15k ⌀ | journal-ref stringlengths 9 298 ⌀ | doi stringlengths 12 97 ⌀ | report-no stringlengths 3 341 ⌀ | categories stringclasses 869 values | license stringclasses 9 values | orig_abstract stringlengths 16 2.44k | versions listlengths 1 39 | update_date stringlengths 10 10 | authors_parsed listlengths 1 565 | abstract stringlengths 13 2.44k |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
1905.05650 | Xiang Liu | Qi Huang, Dian-Yong Chen, Xiang Liu and Takayuki Matsuki | Charged charmoniumlike structures in the $e^+ e^- \to \psi(3686) \pi^+
\pi^-$ process based on the ISPE mechanism | 11 pages, 8 figures and 4 tables | Eur. Phys. J. C79 (2019) 613 | 10.1140/epjc/s10052-019-7121-9 | null | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In 2017, the BESIII Collaboration announced the observation of a charged
charmonium-like structure in the $\psi(3686)\pi^\pm$ invariant mass spectrum of
the $e^+ e^- \to \psi(3686) \pi^+ \pi^-$ process at different energy points,
which enables us to perform a precise study of this process based on the
initial single pion emission (ISPE) mechanism. In this work, we perform a
combined fit to the experimental data of the cross section of $e^+ e^- \to
\psi(3686) \pi^+ \pi^-$, and the corresponding $\psi(3686)\pi^\pm$ and dipion
invariant mass spectra. Our result shows that the observed charged
charmonium-like structure in $e^+ e^- \to \psi(3686) \pi^+ \pi^-$ can be well
reproduced based on the ISPE mechanism, and that the corresponding dipion
invariant mass spectrum and cross section can be depicted with the same
parameters. In fact, it provides strong evidence that the ISPE mechanism can be
an underlying mechanism resulting in such novel a phenomenon.
| [
{
"created": "Tue, 14 May 2019 14:48:24 GMT",
"version": "v1"
}
] | 2019-07-25 | [
[
"Huang",
"Qi",
""
],
[
"Chen",
"Dian-Yong",
""
],
[
"Liu",
"Xiang",
""
],
[
"Matsuki",
"Takayuki",
""
]
] | In 2017, the BESIII Collaboration announced the observation of a charged charmonium-like structure in the $\psi(3686)\pi^\pm$ invariant mass spectrum of the $e^+ e^- \to \psi(3686) \pi^+ \pi^-$ process at different energy points, which enables us to perform a precise study of this process based on the initial single pion emission (ISPE) mechanism. In this work, we perform a combined fit to the experimental data of the cross section of $e^+ e^- \to \psi(3686) \pi^+ \pi^-$, and the corresponding $\psi(3686)\pi^\pm$ and dipion invariant mass spectra. Our result shows that the observed charged charmonium-like structure in $e^+ e^- \to \psi(3686) \pi^+ \pi^-$ can be well reproduced based on the ISPE mechanism, and that the corresponding dipion invariant mass spectrum and cross section can be depicted with the same parameters. In fact, it provides strong evidence that the ISPE mechanism can be an underlying mechanism resulting in such novel a phenomenon. |
hep-ph/0409057 | Sergey Kulagin | S. A. Kulagin | Relations Between NC and CC Neutrino Structure Functions for Nucleons
and Nuclei | 6 pages, 2 figures, more references added, typos corrected. Talk at
3rd International Workshop On Neutrino Nucleus Interactions In The Few GeV
Region (NuInt04), 17-21 Mar 2004, Gran Sasso, Assergi, Italy | Nucl.Phys.Proc.Suppl.139:213-218,2005 | 10.1016/j.nuclphysbps.2004.11.207 | null | hep-ph | null | The relations between neutrino NC and CC structure functions and cross
sections, which are driven by isospin symmetry, are discussed for nucleons and
nuclei.
| [
{
"created": "Mon, 6 Sep 2004 15:13:27 GMT",
"version": "v1"
},
{
"created": "Sat, 11 Sep 2004 12:28:03 GMT",
"version": "v2"
}
] | 2014-11-18 | [
[
"Kulagin",
"S. A.",
""
]
] | The relations between neutrino NC and CC structure functions and cross sections, which are driven by isospin symmetry, are discussed for nucleons and nuclei. |
2305.00027 | Basabendu Barman | Basabendu Barman, Anish Ghoshal, Bohdan Grzadkowski, Anna Socha | Measuring Inflaton Couplings via Primordial Gravitational Waves | 43 pages, 7 figures, 2 Tables, version accepted for JHEP | null | 10.1007/JHEP07(2023)231 | null | hep-ph astro-ph.CO | http://creativecommons.org/licenses/by/4.0/ | We investigate the reach of future gravitational wave (GW) detectors in
probing inflaton couplings with visible sector particles that can either be
bosonic or fermionic in nature. Assuming reheating takes place through
perturbative quantum production from vacuum in presence of classical inflaton
background field, we find that the spectral energy density of the primordial GW
generated during inflation becomes sensitive to inflaton-matter coupling. We
conclude, obeying bounds from Big Bang Nucleosysthesis and Cosmic Microwave
Background, that, e.g., inflaton-scalar couplings of the order of
$\sim\mathcal{O}(10^{-20})$ GeV fall within the sensitivity range of several
proposed GW detector facilities. However, this prediction is sensitive to the
size of the inflationary scale, nature of the inflaton-matter interaction and
shape of the potential during reheating. Having found the time-dependent
effective inflaton decay width, we also discuss its implications for dark
matter (DM) production from the thermal plasma via UV freeze-in during
reheating. It is shown, that one can reproduce the observed DM abundance for
its mass up to several PeVs, depending on the dimension of the operator
connecting DM with the thermal bath and the associated scale of the UV physics.
Thus we promote primordial GW to observables sensitive to feebly coupled
inflaton, which is very challenging if not impossible to test in conventional
particle physics laboratories or astrophysical measurements.
| [
{
"created": "Fri, 28 Apr 2023 18:04:37 GMT",
"version": "v1"
},
{
"created": "Thu, 20 Jul 2023 09:24:58 GMT",
"version": "v2"
}
] | 2023-08-16 | [
[
"Barman",
"Basabendu",
""
],
[
"Ghoshal",
"Anish",
""
],
[
"Grzadkowski",
"Bohdan",
""
],
[
"Socha",
"Anna",
""
]
] | We investigate the reach of future gravitational wave (GW) detectors in probing inflaton couplings with visible sector particles that can either be bosonic or fermionic in nature. Assuming reheating takes place through perturbative quantum production from vacuum in presence of classical inflaton background field, we find that the spectral energy density of the primordial GW generated during inflation becomes sensitive to inflaton-matter coupling. We conclude, obeying bounds from Big Bang Nucleosysthesis and Cosmic Microwave Background, that, e.g., inflaton-scalar couplings of the order of $\sim\mathcal{O}(10^{-20})$ GeV fall within the sensitivity range of several proposed GW detector facilities. However, this prediction is sensitive to the size of the inflationary scale, nature of the inflaton-matter interaction and shape of the potential during reheating. Having found the time-dependent effective inflaton decay width, we also discuss its implications for dark matter (DM) production from the thermal plasma via UV freeze-in during reheating. It is shown, that one can reproduce the observed DM abundance for its mass up to several PeVs, depending on the dimension of the operator connecting DM with the thermal bath and the associated scale of the UV physics. Thus we promote primordial GW to observables sensitive to feebly coupled inflaton, which is very challenging if not impossible to test in conventional particle physics laboratories or astrophysical measurements. |
2209.13312 | Shan Cheng | Jian Chai, Shan Cheng and Jun Hua | Determination of pion distribution amplitudes from the electromagnetic
form factor with the data-driven dispersion relation | 9pages, 6 figures, 1 table | null | 10.1140/epjc/s10052-023-11725-2 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the pion electromagnetic form factor in the modulus squared
dispersion relation, and do the model independent extraction of the most
important nonperturbative parameters in pion light-cone distribution amplitude.
The motivation of this work is the recent measurement of timelike form factor
in the resonant regions, which makes up the piece lacking solid QCD-based
calculation. With the perturbative QCD calculation up to next-to-leading-order
QCD corrections and twist four level of meson distribution amplitudes, we
obtain the chiral mass of pion meson as $m_0^\pi(1 \, {\rm GeV}) =
1.31^{+0.27}_{-0.30} \, {\rm GeV}$. More accuracy measurement of the timelike
form factor are desirable to help us to determine the lowest gegenbauer moments
in pion distribution amplitudes with the data-driven dispersion relation method
developed in this work.
| [
{
"created": "Tue, 27 Sep 2022 11:39:51 GMT",
"version": "v1"
}
] | 2023-07-26 | [
[
"Chai",
"Jian",
""
],
[
"Cheng",
"Shan",
""
],
[
"Hua",
"Jun",
""
]
] | We study the pion electromagnetic form factor in the modulus squared dispersion relation, and do the model independent extraction of the most important nonperturbative parameters in pion light-cone distribution amplitude. The motivation of this work is the recent measurement of timelike form factor in the resonant regions, which makes up the piece lacking solid QCD-based calculation. With the perturbative QCD calculation up to next-to-leading-order QCD corrections and twist four level of meson distribution amplitudes, we obtain the chiral mass of pion meson as $m_0^\pi(1 \, {\rm GeV}) = 1.31^{+0.27}_{-0.30} \, {\rm GeV}$. More accuracy measurement of the timelike form factor are desirable to help us to determine the lowest gegenbauer moments in pion distribution amplitudes with the data-driven dispersion relation method developed in this work. |
1812.11192 | Raymond Co | Raymond T. Co, Eric Gonzalez, and Keisuke Harigaya | Axion Misalignment Driven to the Hilltop | 25 pages, 3 figures; v2: discussions and references added, matches
journal version | null | 10.1007/JHEP05(2019)163 | LCTP-18-33 | hep-ph astro-ph.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The QCD axion serves as a well-motivated dark matter candidate and the
misalignment mechanism is known to reproduce the observed abundance with a
decay constant $f_a \simeq \mathcal{O}(10^{12})$ GeV for a misalignment angle
$\theta_{\rm mis} \simeq \mathcal{O}(1)$. While $f_a \ll 10^{12}$ GeV is of
great experimental interest, the misalignment mechanism requires the axion to
be very close to the hilltop, i.e. $\theta_{\rm mis} \simeq \pi$. This
particular choice of $\theta_{\rm mis}$ has been understood as fine-tuning the
initial condition. We offer a dynamical explanation for $\theta_{\rm mis}
\simeq \pi$ in a class of models. The axion dynamically relaxes to the minimum
of the potential by virtue of an enhanced mass in the early universe. This
minimum is subsequently converted to a hilltop because the CP phase of the
theory shifts by $\pi$ when one contribution becomes subdominant to another
with an opposite sign. We demonstrate explicit and viable examples in
supersymmetric models where the higher dimensional Higgs coupling with the
inflaton naturally achieves both criteria. Associated phenomenology includes a
strikingly sharp prediction of $3 \times 10^9$ GeV $\lesssim f_a \lesssim
10^{10}$ GeV and the absence of isocurvature perturbation.
| [
{
"created": "Fri, 28 Dec 2018 19:00:50 GMT",
"version": "v1"
},
{
"created": "Fri, 31 May 2019 13:39:57 GMT",
"version": "v2"
}
] | 2019-06-26 | [
[
"Co",
"Raymond T.",
""
],
[
"Gonzalez",
"Eric",
""
],
[
"Harigaya",
"Keisuke",
""
]
] | The QCD axion serves as a well-motivated dark matter candidate and the misalignment mechanism is known to reproduce the observed abundance with a decay constant $f_a \simeq \mathcal{O}(10^{12})$ GeV for a misalignment angle $\theta_{\rm mis} \simeq \mathcal{O}(1)$. While $f_a \ll 10^{12}$ GeV is of great experimental interest, the misalignment mechanism requires the axion to be very close to the hilltop, i.e. $\theta_{\rm mis} \simeq \pi$. This particular choice of $\theta_{\rm mis}$ has been understood as fine-tuning the initial condition. We offer a dynamical explanation for $\theta_{\rm mis} \simeq \pi$ in a class of models. The axion dynamically relaxes to the minimum of the potential by virtue of an enhanced mass in the early universe. This minimum is subsequently converted to a hilltop because the CP phase of the theory shifts by $\pi$ when one contribution becomes subdominant to another with an opposite sign. We demonstrate explicit and viable examples in supersymmetric models where the higher dimensional Higgs coupling with the inflaton naturally achieves both criteria. Associated phenomenology includes a strikingly sharp prediction of $3 \times 10^9$ GeV $\lesssim f_a \lesssim 10^{10}$ GeV and the absence of isocurvature perturbation. |
hep-ph/9509373 | Ralph Engel | R.Engel and J.Ranft | Hadronic photon-photon interactions at high energies | 18 pages + 26 figures, latex with poscript figures uuencoded | Phys.Rev.D54:4244-4262,1996 | 10.1103/PhysRevD.54.4244 | ENSLAPP-A-540/95 and SI 95-08 | hep-ph | null | Photon-photon collisions are investigated in the framework of the
two-component Dual Parton Model. The model is shown to agree well to hadron
production data from hadron-hadron and photon-hadron collisions. The
multiparticle production in hadron-hadron, photon-hadron and photon-photon
collisions as predicted by the model is compared. Strong differences are only
found as function of the transverse momentum variable. The hadron production in
photon-photon collisions at present and future electron-positron colliders is
studied using photon spectra according to the equivalent photon approximation,
according to beamstrahlung and according to backscattered laser radiation.
| [
{
"created": "Fri, 22 Sep 1995 22:51:36 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Engel",
"R.",
""
],
[
"Ranft",
"J.",
""
]
] | Photon-photon collisions are investigated in the framework of the two-component Dual Parton Model. The model is shown to agree well to hadron production data from hadron-hadron and photon-hadron collisions. The multiparticle production in hadron-hadron, photon-hadron and photon-photon collisions as predicted by the model is compared. Strong differences are only found as function of the transverse momentum variable. The hadron production in photon-photon collisions at present and future electron-positron colliders is studied using photon spectra according to the equivalent photon approximation, according to beamstrahlung and according to backscattered laser radiation. |
hep-ph/9911349 | Jose W. Furtado Valle | A. Ioannisian and J. W. F. Valle | Light Sterile Neutrino from extra dimensions and Four-Neutrino Solutions
to Neutrino Anomalies | 12 pages, latex, no figures, title changed, final version to be
published in Phys Rev D | Phys.Rev.D63:073002,2001 | 10.1103/PhysRevD.63.073002 | FTUV/99-78, IFIC/99-81, MPI-Th/99-38 | hep-ph hep-th | null | We propose a four-neutrino model which can reconcile the existing data coming
from underground experiments in terms of neutrino oscillations, together with
the hint from the LSND experiment and a possible neutrino contribution to the
hot dark matter of the Universe. It applies the idea that extra compact
dimensions, probed only by gravity and possibly gauge-singlet fields, can lower
the fundamental scales such as the Planck, string or unification scales. Our
fourth light neutrino $\nu_s$ ($s$ for sterile) is identified with the zero
mode of the Kaluza-Klein states. To first approximation \nu_sterile combines
with the nu_mu in order to form a Dirac neutrino with mass in the eV range
leaving the other two neutrinos massless. The smallness of this mass scale
(suitable for LSND and Hot Dark Matter) arises without appealing neither to a
see-saw mechanism nor to a radiative mechanism, but from the volume factor
associated with the canonical normalization of the wave-function of the bulk
field in the compactified dimensions. % On the other hand the splitting between
\nm and \nu_sterile (atmospheric scale) as well as the mass of the two other
neutrinos (solar mass scale) arise from the violation of the fermion number on
distant branes. We also discuss alternative scenarios involving
flavour-changing interactions. In one of them \ne can be in the electron-volt
range and therefore be probed in beta decay studies.
| [
{
"created": "Sun, 14 Nov 1999 17:51:51 GMT",
"version": "v1"
},
{
"created": "Tue, 12 Dec 2000 11:12:43 GMT",
"version": "v2"
}
] | 2009-09-17 | [
[
"Ioannisian",
"A.",
""
],
[
"Valle",
"J. W. F.",
""
]
] | We propose a four-neutrino model which can reconcile the existing data coming from underground experiments in terms of neutrino oscillations, together with the hint from the LSND experiment and a possible neutrino contribution to the hot dark matter of the Universe. It applies the idea that extra compact dimensions, probed only by gravity and possibly gauge-singlet fields, can lower the fundamental scales such as the Planck, string or unification scales. Our fourth light neutrino $\nu_s$ ($s$ for sterile) is identified with the zero mode of the Kaluza-Klein states. To first approximation \nu_sterile combines with the nu_mu in order to form a Dirac neutrino with mass in the eV range leaving the other two neutrinos massless. The smallness of this mass scale (suitable for LSND and Hot Dark Matter) arises without appealing neither to a see-saw mechanism nor to a radiative mechanism, but from the volume factor associated with the canonical normalization of the wave-function of the bulk field in the compactified dimensions. % On the other hand the splitting between \nm and \nu_sterile (atmospheric scale) as well as the mass of the two other neutrinos (solar mass scale) arise from the violation of the fermion number on distant branes. We also discuss alternative scenarios involving flavour-changing interactions. In one of them \ne can be in the electron-volt range and therefore be probed in beta decay studies. |
hep-ph/9903519 | null | S.I. Bityukov, N.V. Krasnikov | Gaugino pair production at LHC for the case of nonuniversal gaugino
masses | 1 latex files (10 pages) | Nuovo Cim. A112 (1999) 913-919 | null | null | hep-ph | null | We investigate \chi^{+/-}_1 \chi^0_2 pair production at LHC (CMS) with
subsequent decays into leptons for the case of nonuniversal gaugino masses.
Visibility of signal by an excess over SM background in 3 leptons + no jet +
E^{miss}_T events depends rather strongly on the relation between LSP mass
\chi^0_1 and \chi^{+/-}_1 mass. We also give some preliminary results on the
investigation of squark and gluino production at LHC for the case of
nonuniversal gaugino masses.
| [
{
"created": "Mon, 29 Mar 1999 19:33:05 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Bityukov",
"S. I.",
""
],
[
"Krasnikov",
"N. V.",
""
]
] | We investigate \chi^{+/-}_1 \chi^0_2 pair production at LHC (CMS) with subsequent decays into leptons for the case of nonuniversal gaugino masses. Visibility of signal by an excess over SM background in 3 leptons + no jet + E^{miss}_T events depends rather strongly on the relation between LSP mass \chi^0_1 and \chi^{+/-}_1 mass. We also give some preliminary results on the investigation of squark and gluino production at LHC for the case of nonuniversal gaugino masses. |
2205.07169 | Li--Juan Liu | Xue-Chao Feng, Wei-Hao, and li-Juan Liu | The assignments of the bottom mesons within the screened potential model
and $^3P_0$ model | 6 pages, 2 figures | null | 10.1142/S0218301322500665 | null | hep-ph | http://creativecommons.org/licenses/by/4.0/ | In this work, we calculate the mass spectrum of the bottom mesons with a
modified nonrelativistic quark model by involving the screening effect, and
explore their strong decay properties within the $^3P_0$ model. Our results
suggest that the $B_1(5721)$, $B^*_2(5747)$, $B_J(5840)$, and $B_J(5970)$ could
be reasonably assigned as the $B_1^\prime(1P)$, $B(1^3P_2)$, $B(2^1S_0)$, and
$B(1^3D_3)$ respectively. The more precise measurements of the excited bottom
mesons are crucial to confirm these assignments.
| [
{
"created": "Sun, 15 May 2022 03:05:04 GMT",
"version": "v1"
}
] | 2022-09-14 | [
[
"Feng",
"Xue-Chao",
""
],
[
"Wei-Hao",
"",
""
],
[
"Liu",
"li-Juan",
""
]
] | In this work, we calculate the mass spectrum of the bottom mesons with a modified nonrelativistic quark model by involving the screening effect, and explore their strong decay properties within the $^3P_0$ model. Our results suggest that the $B_1(5721)$, $B^*_2(5747)$, $B_J(5840)$, and $B_J(5970)$ could be reasonably assigned as the $B_1^\prime(1P)$, $B(1^3P_2)$, $B(2^1S_0)$, and $B(1^3D_3)$ respectively. The more precise measurements of the excited bottom mesons are crucial to confirm these assignments. |
1510.01982 | Andreas Schmitt | Alexander Haber, Andreas Schmitt, Stephan Stetina | Instabilities in relativistic two-component (super)fluids | 25 pages, 7 figures, v2: minor modifications; references added; parts
of Sec III.B moved into new appendix B; version published in Phys. Rev. D | Phys. Rev. D 93, 025011 (2016) | 10.1103/PhysRevD.93.025011 | null | hep-ph astro-ph.SR cond-mat.quant-gas | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study two-fluid systems with nonzero fluid velocities and compute their
sound modes, which indicate various instabilities. For the case of two
zero-temperature superfluids we employ a microscopic field-theoretical model of
two coupled bosonic fields, including an entrainment coupling and a
non-entrainment coupling. We analyse the onset of the various instabilities
systematically and point out that the dynamical two-stream instability can only
occur beyond Landau's critical velocity, i.e., in an already energetically
unstable regime. A qualitative difference is found for the case of two normal
fluids, where certain transverse modes suffer a two-stream instability in an
energetically stable regime if there is entrainment between the fluids. Since
we work in a fully relativistic setup, our results are very general and of
potential relevance for (super)fluids in neutron stars and, in the
non-relativistic limit of our results, in the laboratory.
| [
{
"created": "Wed, 7 Oct 2015 15:07:40 GMT",
"version": "v1"
},
{
"created": "Mon, 25 Jan 2016 13:13:54 GMT",
"version": "v2"
}
] | 2016-01-26 | [
[
"Haber",
"Alexander",
""
],
[
"Schmitt",
"Andreas",
""
],
[
"Stetina",
"Stephan",
""
]
] | We study two-fluid systems with nonzero fluid velocities and compute their sound modes, which indicate various instabilities. For the case of two zero-temperature superfluids we employ a microscopic field-theoretical model of two coupled bosonic fields, including an entrainment coupling and a non-entrainment coupling. We analyse the onset of the various instabilities systematically and point out that the dynamical two-stream instability can only occur beyond Landau's critical velocity, i.e., in an already energetically unstable regime. A qualitative difference is found for the case of two normal fluids, where certain transverse modes suffer a two-stream instability in an energetically stable regime if there is entrainment between the fluids. Since we work in a fully relativistic setup, our results are very general and of potential relevance for (super)fluids in neutron stars and, in the non-relativistic limit of our results, in the laboratory. |
1506.00359 | Liucheng Wang | Ran Ding, Tianjun Li, Liucheng Wang, Bin Zhu | Towards the Natural Gauge Mediation | 22 pages, 7 figures, Latex | null | null | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The sweet spot supersymmetry (SUSY) solves the mu problem in the Minimal
Supersymmetric Standard Model (MSSM) with gauge mediated SUSY breaking (GMSB)
via the generalized Giudice-Masiero (GM) mechanism where only the mu-term and
soft Higgs masses are generated at the unification scale of the Grand Unified
Theory (GUT) due to the approximate PQ symmetry. Because all the other SUSY
breaking soft terms are generated via the GMSB below the GUT scale, there
exists SUSY electroweak (EW) fine-tuning problem to explain the 125 GeV Higgs
boson mass due to small trilinear soft term. Thus, to explain the Higgs boson
mass, we propose the GMSB with both the generalized GM mechanism and
Higgs-messenger interactions. The renormalization group equations are runnings
from the GUT scale down to EW scale. So the EW symmetry breaking can be
realized easier. We can keep the gauge coupling unification and solution to the
flavor problem in the GMSB, as well as solve the \mu/B_{\mu}-problem. Moreover,
there are only five free parameters in our model. So we can determine the
characteristic low energy spectra and explore its distinct phenomenology. The
low-scale fine-tuning measure can be as low as 20 with the light stop mass
below 1 TeV and gluino mass below 2 TeV. The gravitino dark matter can come
from a thermal production with the correct relic density and be consistent with
the thermal leptogenesis. Because gluino and stop can be relatively light in
our model, how to search for such GMSB at the upcoming run II of the LHC
experiment could be very interesting.
| [
{
"created": "Mon, 1 Jun 2015 06:36:33 GMT",
"version": "v1"
}
] | 2015-06-02 | [
[
"Ding",
"Ran",
""
],
[
"Li",
"Tianjun",
""
],
[
"Wang",
"Liucheng",
""
],
[
"Zhu",
"Bin",
""
]
] | The sweet spot supersymmetry (SUSY) solves the mu problem in the Minimal Supersymmetric Standard Model (MSSM) with gauge mediated SUSY breaking (GMSB) via the generalized Giudice-Masiero (GM) mechanism where only the mu-term and soft Higgs masses are generated at the unification scale of the Grand Unified Theory (GUT) due to the approximate PQ symmetry. Because all the other SUSY breaking soft terms are generated via the GMSB below the GUT scale, there exists SUSY electroweak (EW) fine-tuning problem to explain the 125 GeV Higgs boson mass due to small trilinear soft term. Thus, to explain the Higgs boson mass, we propose the GMSB with both the generalized GM mechanism and Higgs-messenger interactions. The renormalization group equations are runnings from the GUT scale down to EW scale. So the EW symmetry breaking can be realized easier. We can keep the gauge coupling unification and solution to the flavor problem in the GMSB, as well as solve the \mu/B_{\mu}-problem. Moreover, there are only five free parameters in our model. So we can determine the characteristic low energy spectra and explore its distinct phenomenology. The low-scale fine-tuning measure can be as low as 20 with the light stop mass below 1 TeV and gluino mass below 2 TeV. The gravitino dark matter can come from a thermal production with the correct relic density and be consistent with the thermal leptogenesis. Because gluino and stop can be relatively light in our model, how to search for such GMSB at the upcoming run II of the LHC experiment could be very interesting. |
hep-ph/0506242 | Aaron Pierce | A. Arvanitaki, S. Dimopoulos, A. Pierce, S. Rajendran, and J. Wacker | Stopping Gluinos | 18 +1 pages. 6 figures | Phys.Rev.D76:055007,2007 | 10.1103/PhysRevD.76.055007 | SLAC-PUB-11302 | hep-ph hep-ex | null | Long lived gluinos are the trademark of split supersymmetry. They form
R-hadrons that, when charged, efficiently lose energy in matter via ionisation.
Independent of R-spectroscopy and initial hadronization, a fraction of
R-hadrons become charged while traversing a detector. This results in a large
number of stopped gluinos at present and future detectors. For a 300 GeV
gluino, $10^6$ will stop each year in LHC detectors, while several hundred stop
in detectors during Run II at the Tevatron. The subsequent decays of stopped
gluinos produce distinctive depositions of energy in calorimeters with no
activity in either the tracker or the muon chamber. The gluino lifetime can be
determined by looking for events where both gluinos stop and subsequently
decay.
| [
{
"created": "Fri, 24 Jun 2005 19:52:59 GMT",
"version": "v1"
},
{
"created": "Tue, 2 Aug 2005 18:37:48 GMT",
"version": "v2"
}
] | 2008-11-26 | [
[
"Arvanitaki",
"A.",
""
],
[
"Dimopoulos",
"S.",
""
],
[
"Pierce",
"A.",
""
],
[
"Rajendran",
"S.",
""
],
[
"Wacker",
"J.",
""
]
] | Long lived gluinos are the trademark of split supersymmetry. They form R-hadrons that, when charged, efficiently lose energy in matter via ionisation. Independent of R-spectroscopy and initial hadronization, a fraction of R-hadrons become charged while traversing a detector. This results in a large number of stopped gluinos at present and future detectors. For a 300 GeV gluino, $10^6$ will stop each year in LHC detectors, while several hundred stop in detectors during Run II at the Tevatron. The subsequent decays of stopped gluinos produce distinctive depositions of energy in calorimeters with no activity in either the tracker or the muon chamber. The gluino lifetime can be determined by looking for events where both gluinos stop and subsequently decay. |
2003.04886 | Martin Hoferichter | Andreas Crivellin, Martin Hoferichter, Claudio Andrea Manzari, Marc
Montull | Hadronic vacuum polarization: $(g-2)_\mu$ versus global electroweak fits | 7 pages, 2 figures; journal version | Phys. Rev. Lett. 125, 091801 (2020) | 10.1103/PhysRevLett.125.091801 | PSI-PR-20-04, UZ-TH 06/20 | hep-ph hep-ex hep-lat nucl-ex nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Hadronic vacuum polarization (HVP) is not only a critical part of the
Standard Model (SM) prediction for the anomalous magnetic moment of the muon
$(g-2)_\mu$, but also a crucial ingredient for global fits to electroweak (EW)
precision observables due to its contribution to the running of the
fine-structure constant encoded in $\Delta\alpha^{(5)}_\text{had}$. We find
that with modern EW precision data, including the measurement of the Higgs
mass, the global fit alone provides a competitive, independent determination of
$\Delta \alpha^{(5)}_\text{had}\big|_\text{EW}=270.2(3.0)\times 10^{-4}$. This
value actually lies below the range derived from $e^+e^-\to\text{hadrons}$
cross-section data, and thus goes into the opposite direction as would be
required if a change in HVP were to bring the SM prediction for $(g-2)_\mu$
into agreement with the Brookhaven measurement. Depending on the energy where
the bulk of the changes in the cross section occurs, reconciling experiment and
SM prediction for $(g-2)_\mu$ by adjusting HVP would thus not necessarily
weaken the case for physics beyond the SM (BSM), but to some extent shift it
from $(g-2)_\mu$ to the EW fit. We briefly explore some options of BSM
scenarios that could conceivably explain the ensuing tension.
| [
{
"created": "Tue, 10 Mar 2020 17:57:39 GMT",
"version": "v1"
},
{
"created": "Thu, 7 May 2020 15:31:46 GMT",
"version": "v2"
},
{
"created": "Fri, 28 Aug 2020 15:34:42 GMT",
"version": "v3"
}
] | 2020-08-31 | [
[
"Crivellin",
"Andreas",
""
],
[
"Hoferichter",
"Martin",
""
],
[
"Manzari",
"Claudio Andrea",
""
],
[
"Montull",
"Marc",
""
]
] | Hadronic vacuum polarization (HVP) is not only a critical part of the Standard Model (SM) prediction for the anomalous magnetic moment of the muon $(g-2)_\mu$, but also a crucial ingredient for global fits to electroweak (EW) precision observables due to its contribution to the running of the fine-structure constant encoded in $\Delta\alpha^{(5)}_\text{had}$. We find that with modern EW precision data, including the measurement of the Higgs mass, the global fit alone provides a competitive, independent determination of $\Delta \alpha^{(5)}_\text{had}\big|_\text{EW}=270.2(3.0)\times 10^{-4}$. This value actually lies below the range derived from $e^+e^-\to\text{hadrons}$ cross-section data, and thus goes into the opposite direction as would be required if a change in HVP were to bring the SM prediction for $(g-2)_\mu$ into agreement with the Brookhaven measurement. Depending on the energy where the bulk of the changes in the cross section occurs, reconciling experiment and SM prediction for $(g-2)_\mu$ by adjusting HVP would thus not necessarily weaken the case for physics beyond the SM (BSM), but to some extent shift it from $(g-2)_\mu$ to the EW fit. We briefly explore some options of BSM scenarios that could conceivably explain the ensuing tension. |
1808.03700 | Adam Green | Adam Green and Philip Tanedo | DarkCapPy: Dark Matter Capture and Annihilation | 25 pages, 5 figures. Accompanying GitHub package:
http://github.com/agree019/DarkCapPy | null | 10.1016/j.cpc.2019.04.010 | UCR-TR-2018-FLIP-L3-37 | hep-ph physics.comp-ph | http://creativecommons.org/licenses/by/4.0/ | DarkCapPy is a Python 3/Jupyter package for calculating rates associated with
dark matter capture in the Earth, annihilation into light mediators, and the
subsequent observable decay of the light mediators near the surface of the
Earth. The package includes a calculation of the Sommerfeld enhancement at the
center of the Earth and the timescale for capture--annihilation equilibrium.
The code is open source and can be modified for other compact astronomical
objects and mediator spins.
| [
{
"created": "Fri, 10 Aug 2018 20:40:31 GMT",
"version": "v1"
}
] | 2019-07-24 | [
[
"Green",
"Adam",
""
],
[
"Tanedo",
"Philip",
""
]
] | DarkCapPy is a Python 3/Jupyter package for calculating rates associated with dark matter capture in the Earth, annihilation into light mediators, and the subsequent observable decay of the light mediators near the surface of the Earth. The package includes a calculation of the Sommerfeld enhancement at the center of the Earth and the timescale for capture--annihilation equilibrium. The code is open source and can be modified for other compact astronomical objects and mediator spins. |
hep-ph/0610301 | Danny Marfatia | V. Barger, Patrick Huber, Danny Marfatia, Walter Winter | Upgraded experiments with super neutrino beams: Reach versus Exposure | 4 pages, 2 figures, 1 table. Version to appear as a Rapid
Communication in PRD | Phys.Rev.D76:031301,2007 | 10.1103/PhysRevD.76.031301 | null | hep-ph hep-ex | null | We introduce exposure as a means to making balanced comparisons of the
sensitivities of long-baseline neutrino experiments to a nonzero \theta_{13},
to CP violation and to the neutrino mass hierarchy. We illustrate its use by
comparing the sensitivities of possible upgrades of superbeam experiments,
namely NOvA*, T2KK and experiments with wide band beams. For the proposed
exposures, we find the best nominal CP violation performance for T2KK. For
equal exposures, a wide band beam experiment has the best mass hierarchy
performance. The physics concept on which NOvA* is based has the best potential
for discovering CP violation only for exposures above a threshold value.
| [
{
"created": "Tue, 24 Oct 2006 17:56:47 GMT",
"version": "v1"
},
{
"created": "Sun, 4 Mar 2007 18:06:50 GMT",
"version": "v2"
},
{
"created": "Tue, 10 Jul 2007 15:43:02 GMT",
"version": "v3"
}
] | 2008-11-26 | [
[
"Barger",
"V.",
""
],
[
"Huber",
"Patrick",
""
],
[
"Marfatia",
"Danny",
""
],
[
"Winter",
"Walter",
""
]
] | We introduce exposure as a means to making balanced comparisons of the sensitivities of long-baseline neutrino experiments to a nonzero \theta_{13}, to CP violation and to the neutrino mass hierarchy. We illustrate its use by comparing the sensitivities of possible upgrades of superbeam experiments, namely NOvA*, T2KK and experiments with wide band beams. For the proposed exposures, we find the best nominal CP violation performance for T2KK. For equal exposures, a wide band beam experiment has the best mass hierarchy performance. The physics concept on which NOvA* is based has the best potential for discovering CP violation only for exposures above a threshold value. |
1105.3024 | Aqeel Ahmed | Fayyazuddin | Particle Mixing and CP-Violation | 37 pages and 5 figures | null | null | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this review, the $X^{0}-\bar{X}^{0}$\ mixing ($%
X^{0}=B^{0},B_{s}^{0},K^{0}$) and its implication for CP\ violation in the
standard model are discussed. Both direct and mixing induced CP\ violation for
$K^{0}(\bar{K}^{0})$, $B^{0}(\bar{B}^{0})$\ and $B_{s}^{0}(% \bar{B}_{s}^{0})$\
are reviewed.
| [
{
"created": "Mon, 16 May 2011 08:10:27 GMT",
"version": "v1"
}
] | 2015-03-19 | [
[
"Fayyazuddin",
"",
""
]
] | In this review, the $X^{0}-\bar{X}^{0}$\ mixing ($% X^{0}=B^{0},B_{s}^{0},K^{0}$) and its implication for CP\ violation in the standard model are discussed. Both direct and mixing induced CP\ violation for $K^{0}(\bar{K}^{0})$, $B^{0}(\bar{B}^{0})$\ and $B_{s}^{0}(% \bar{B}_{s}^{0})$\ are reviewed. |
1709.01737 | Sudhanwa Patra Dr. | M. Sruthilaya, Rukmani Mohanta, Sudhanwa Patra | $A_4$ realization of Linear Seesaw and Neutrino Phenomenology | 23 pages, 23 captioned fugure | null | 10.1140/epjc/s10052-018-6181-6 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Motivated by the crucial role played by the discrete flavour symmetry groups
in explaining the observed neutrino oscillation data, we consider the $A_4$
realization of linear seesaw by extending the standard model (SM) particle
content with two types of right-handed neutrinos along with the flavon fields,
and the SM symmetry with $A_4\times Z_4\times Z_2$ and a global symmetry
$U(1)_X$ which is broken explicitly by the Higgs potential. We scrutinize
whether this model can explain the recent results from neutrino oscillation
experiments by searching for parameter space that can accommodate the
observables such as the reactor mixing angle $\theta_{13}$, the CP violating
phase $\delta_{CP}$, sum of active neutrino masses $\Sigma_{i} m_i$, solar and
atmospheric mass squared differences, and the lepton number violating parameter
called as effective Majorana mass parameter, in line with recent experimental
results. We also discuss the scope of this model to explain the baryon
asymmetry of the universe through Leptogenesis. We also investigate the
possibility of probing the non-unitarity effect in this scenario, but it is
found to be rather small.
| [
{
"created": "Wed, 6 Sep 2017 09:32:52 GMT",
"version": "v1"
}
] | 2018-09-26 | [
[
"Sruthilaya",
"M.",
""
],
[
"Mohanta",
"Rukmani",
""
],
[
"Patra",
"Sudhanwa",
""
]
] | Motivated by the crucial role played by the discrete flavour symmetry groups in explaining the observed neutrino oscillation data, we consider the $A_4$ realization of linear seesaw by extending the standard model (SM) particle content with two types of right-handed neutrinos along with the flavon fields, and the SM symmetry with $A_4\times Z_4\times Z_2$ and a global symmetry $U(1)_X$ which is broken explicitly by the Higgs potential. We scrutinize whether this model can explain the recent results from neutrino oscillation experiments by searching for parameter space that can accommodate the observables such as the reactor mixing angle $\theta_{13}$, the CP violating phase $\delta_{CP}$, sum of active neutrino masses $\Sigma_{i} m_i$, solar and atmospheric mass squared differences, and the lepton number violating parameter called as effective Majorana mass parameter, in line with recent experimental results. We also discuss the scope of this model to explain the baryon asymmetry of the universe through Leptogenesis. We also investigate the possibility of probing the non-unitarity effect in this scenario, but it is found to be rather small. |
1112.2837 | Fayyazuddin Fayyazuddin | Fayyazuddin | Electroweak unification of quarks and leptons in a gauge group
$SU_{C}(3)\times SU(4)\times U_{X}(1)$ | 7 pages, 0 figures | null | 10.1142/S0217751X12501175 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A model for electroweak unification of quarks and leptons, in a gauge group
$SU_{C}(3)\times SU(4)\times U_{X}(1)$ is constructed. The model requires,
three generations of quarks and leptons which are replicas (mirror) of the
standard quarks and leptons. The gauge group $SU(4)\times U_{X}(1)$ is broken
in such a way so as to reproduce standard model and to generate heavy masses
for the vector bosons ($W^{\pm}_{R_{\mu}}$,
$Z^{\prime}_{\mu}$,$Z^{\prime\prime}_{\mu}$), the leptoquarks and mirror
fermions. It is shown lower limit on mass scale of mirror fermions is
$m_{E}\geq\frac{m_{Z}}{2}$, $E^{-}$ being the lightest mirror fermion coupled
to Z boson. As the universe expands, the heavy matter is decoupled at an early
stage of expansion and may be a source of dark matter. Leptoquarks in the model
connect the standard model and mirror fermions. Baryon genesis in our Universe
implies antibaryon genesis in mirror Universe.
| [
{
"created": "Tue, 13 Dec 2011 09:56:30 GMT",
"version": "v1"
},
{
"created": "Sat, 17 Mar 2012 08:21:38 GMT",
"version": "v2"
}
] | 2015-06-03 | [
[
"Fayyazuddin",
"",
""
]
] | A model for electroweak unification of quarks and leptons, in a gauge group $SU_{C}(3)\times SU(4)\times U_{X}(1)$ is constructed. The model requires, three generations of quarks and leptons which are replicas (mirror) of the standard quarks and leptons. The gauge group $SU(4)\times U_{X}(1)$ is broken in such a way so as to reproduce standard model and to generate heavy masses for the vector bosons ($W^{\pm}_{R_{\mu}}$, $Z^{\prime}_{\mu}$,$Z^{\prime\prime}_{\mu}$), the leptoquarks and mirror fermions. It is shown lower limit on mass scale of mirror fermions is $m_{E}\geq\frac{m_{Z}}{2}$, $E^{-}$ being the lightest mirror fermion coupled to Z boson. As the universe expands, the heavy matter is decoupled at an early stage of expansion and may be a source of dark matter. Leptoquarks in the model connect the standard model and mirror fermions. Baryon genesis in our Universe implies antibaryon genesis in mirror Universe. |
1304.2207 | Yufeng Li | H.W. Long, Y.F. Li, C. Giunti | CP-violating Phases in Active-Sterile Solar Neutrino Oscillations | 24 pages, 8 figures, Final version published in Phys. Rev. D 87,
113004 (2013) | Phys.Rev. D87 (2013) 113004 | 10.1103/PhysRevD.87.113004 | null | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Effects of CP-violating phases in active-sterile solar neutrino oscillations
are discussed in a general scheme of 3+N_{s} mixing, without any constraint on
the mixing between the three active and the N_{s} sterile neutrinos, assuming
only a realistic hierarchy of neutrino mass-squared differences. A generalized
Parke formula describing the neutrino oscillation probabilities inside the Sun
is calculated. The validity of the analytical calculation and the probability
variation due to the unknown CP-violating phases are illustrated with a
numerical calculation of the evolution equation in the case of 3+1 neutrino
mixing.
| [
{
"created": "Mon, 8 Apr 2013 13:41:35 GMT",
"version": "v1"
},
{
"created": "Wed, 24 Apr 2013 00:58:11 GMT",
"version": "v2"
},
{
"created": "Tue, 18 Jun 2013 00:44:31 GMT",
"version": "v3"
}
] | 2013-07-10 | [
[
"Long",
"H. W.",
""
],
[
"Li",
"Y. F.",
""
],
[
"Giunti",
"C.",
""
]
] | Effects of CP-violating phases in active-sterile solar neutrino oscillations are discussed in a general scheme of 3+N_{s} mixing, without any constraint on the mixing between the three active and the N_{s} sterile neutrinos, assuming only a realistic hierarchy of neutrino mass-squared differences. A generalized Parke formula describing the neutrino oscillation probabilities inside the Sun is calculated. The validity of the analytical calculation and the probability variation due to the unknown CP-violating phases are illustrated with a numerical calculation of the evolution equation in the case of 3+1 neutrino mixing. |
1506.06170 | Feng Yuan | Peng Sun, C.-P. Yuan, Feng Yuan | Transverse Momentum Resummation for Dijet Correlation in Hadronic
Collisions | 51 pages, 10 figures | Phys. Rev. D 92, 094007 (2015) | 10.1103/PhysRevD.92.094007 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the transverse momentum resummation for dijet correlation in hadron
collisions based on the Collins-Soper-Sterman formalism. The complete one-loop
calculations are carried out in the collinear factorization framework for the
differential cross sections at low imbalance transverse momentum between the
two jets. Important cross checks are performed to demonstrate that the soft
divergences cancelled out between different diagrams, and in particular, those
associated with final state jets. The leading and sub-leading logarithms are
identified. All order resummation is derived following the transverse momentum
dependent factorization at this order. Its phenomenological applications are
also presented.
| [
{
"created": "Fri, 19 Jun 2015 22:21:12 GMT",
"version": "v1"
}
] | 2015-11-11 | [
[
"Sun",
"Peng",
""
],
[
"Yuan",
"C. -P.",
""
],
[
"Yuan",
"Feng",
""
]
] | We study the transverse momentum resummation for dijet correlation in hadron collisions based on the Collins-Soper-Sterman formalism. The complete one-loop calculations are carried out in the collinear factorization framework for the differential cross sections at low imbalance transverse momentum between the two jets. Important cross checks are performed to demonstrate that the soft divergences cancelled out between different diagrams, and in particular, those associated with final state jets. The leading and sub-leading logarithms are identified. All order resummation is derived following the transverse momentum dependent factorization at this order. Its phenomenological applications are also presented. |
hep-ph/0112132 | Takayuki Kondo | N. Haba, T. Kondo and Y. Shimizu | Fermion Mass Hierarchy in Six Dimensional SO(10) Grand Unified Theory on
a $T^2/Z_2$ Orbifold | 16pages, 1figure. References added and version to appear in Phys.
Lett. B | Phys.Lett. B531 (2002) 245-254 | 10.1016/S0370-2693(02)01503-4 | DPNU-01-35 | hep-ph | null | We suggest a simple supersymmetric SO(10) grand unified theory in 6
dimensions which produces the suitable fermion mass hierarchies. The 5th and
6th dimensional coordinates are compactified on a $T^2/Z_2$ orbifold. The gauge
and Higgs fields propagate in 6 dimensions while ordinal chiral matter fields
are localized in 4 dimensions. The orbifolding and boundary conditions realize
the gauge symmetry reduction,
$SU(3)_C\times SU(2)_L \times U(1)_Y \times U(1)_X$, and the triplet-doublet
mass splitting. We introduce extra three sets of vector-like heavy fields: two
sets propagate in 6 dimensions and chiral fields which couple to them are
defined as the 1st generation, and one set propagates in 5 dimensions and
chiral fields which couple to them are defined as the 2nd generation. The
suitable fermion mass hierarchies are generated by integrating out these
vector-like heavy fields.
| [
{
"created": "Mon, 10 Dec 2001 12:47:53 GMT",
"version": "v1"
},
{
"created": "Wed, 6 Feb 2002 10:04:04 GMT",
"version": "v2"
},
{
"created": "Fri, 22 Mar 2002 06:03:56 GMT",
"version": "v3"
}
] | 2009-11-07 | [
[
"Haba",
"N.",
""
],
[
"Kondo",
"T.",
""
],
[
"Shimizu",
"Y.",
""
]
] | We suggest a simple supersymmetric SO(10) grand unified theory in 6 dimensions which produces the suitable fermion mass hierarchies. The 5th and 6th dimensional coordinates are compactified on a $T^2/Z_2$ orbifold. The gauge and Higgs fields propagate in 6 dimensions while ordinal chiral matter fields are localized in 4 dimensions. The orbifolding and boundary conditions realize the gauge symmetry reduction, $SU(3)_C\times SU(2)_L \times U(1)_Y \times U(1)_X$, and the triplet-doublet mass splitting. We introduce extra three sets of vector-like heavy fields: two sets propagate in 6 dimensions and chiral fields which couple to them are defined as the 1st generation, and one set propagates in 5 dimensions and chiral fields which couple to them are defined as the 2nd generation. The suitable fermion mass hierarchies are generated by integrating out these vector-like heavy fields. |
1812.11072 | Kenta Takagi | Tatsuo Kobayashi, Yusuke Shimizu, Kenta Takagi, Morimitsu Tanimoto,
Takuya H. Tatsuishi, Hikaru Uchida | Finite modular subgroups for fermion mass matrices and baryon/lepton
number violation | 17 pages, 2 figures, 2 Tables, some comments added, published
version. arXiv admin note: text overlap with arXiv:1808.03012 | null | 10.1016/j.physletb.2019.05.034 | EPHOU-18-017, HUPD1810 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study a flavor model that the quark sector has the $S_3$ modular
symmetry,while the lepton sector has the $A_4$ modular symmetry. Our model
leads to characteristic quark mass matrices which are consistent with
experimental data of quark masses, mixing angles and the CP violating phase.
The lepton sector is also consistent with the experimental data of neutrino
oscillations. We also study baryon and lepton number violations in our flavor
model.
| [
{
"created": "Sun, 23 Dec 2018 08:38:32 GMT",
"version": "v1"
},
{
"created": "Tue, 9 Apr 2019 03:49:32 GMT",
"version": "v2"
},
{
"created": "Wed, 19 Jun 2019 07:12:50 GMT",
"version": "v3"
}
] | 2019-06-20 | [
[
"Kobayashi",
"Tatsuo",
""
],
[
"Shimizu",
"Yusuke",
""
],
[
"Takagi",
"Kenta",
""
],
[
"Tanimoto",
"Morimitsu",
""
],
[
"Tatsuishi",
"Takuya H.",
""
],
[
"Uchida",
"Hikaru",
""
]
] | We study a flavor model that the quark sector has the $S_3$ modular symmetry,while the lepton sector has the $A_4$ modular symmetry. Our model leads to characteristic quark mass matrices which are consistent with experimental data of quark masses, mixing angles and the CP violating phase. The lepton sector is also consistent with the experimental data of neutrino oscillations. We also study baryon and lepton number violations in our flavor model. |
1711.04431 | Ryo Nagai | Norimi Yokozaki and Ryo Nagai | Light Higgsino and Gluino in $R$-invariant Direct Gauge Mediation | 14 pages, 3 figures | null | null | TU-1051 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We provide a simple solution to the $\mu$-$B_\mu$ problem in the
"$R$-invariant direct gauge mediation model". With the solution, the Higgsino
and gluino are predicted to be light as $\mathcal{O}(100)$GeV and
$\mathcal{O}(1)$TeV, respectively. Those gluino and Higgsino can be accessible
at the LHC and future collider experiments. Moreover, dangerous dimension five
operators inducing rapid proton decays are naturally suppressed by the
$R$-symmetry.
| [
{
"created": "Mon, 13 Nov 2017 06:21:07 GMT",
"version": "v1"
}
] | 2017-11-15 | [
[
"Yokozaki",
"Norimi",
""
],
[
"Nagai",
"Ryo",
""
]
] | We provide a simple solution to the $\mu$-$B_\mu$ problem in the "$R$-invariant direct gauge mediation model". With the solution, the Higgsino and gluino are predicted to be light as $\mathcal{O}(100)$GeV and $\mathcal{O}(1)$TeV, respectively. Those gluino and Higgsino can be accessible at the LHC and future collider experiments. Moreover, dangerous dimension five operators inducing rapid proton decays are naturally suppressed by the $R$-symmetry. |
2405.00112 | Anirban Das | Anirban Das, Noah Kurinsky, and Rebecca K. Leane | Transmon Qubit Constraints on Dark Matter-Nucleon Scattering | (v2) 11 pages, 5 figures, matches published version | null | null | SLAC-PUB-17769 | hep-ph astro-ph.CO hep-ex | http://creativecommons.org/licenses/by/4.0/ | We recently pointed out that power measurements of single quasiparticle
devices can be used to detect dark matter. These devices have the lowest known
energy thresholds, far surpassing standard direct detection experiments,
requiring energy deposition above only about an meV. We calculate dark matter
induced quasiparticle densities in transmon qubits, and use the latest transmon
qubit measurements that provide one of the strongest existing lab-based bounds
on dark matter-nucleon scattering below about 100 MeV. We strongly constrain
sub-component dark matter, using both a dark matter population thermalized in
the Earth as well as the dark matter wind from the Galactic halo. We
demonstrate future potential sensitivities using devices with low quasiparticle
densities.
| [
{
"created": "Tue, 30 Apr 2024 18:01:40 GMT",
"version": "v1"
},
{
"created": "Tue, 6 Aug 2024 03:38:50 GMT",
"version": "v2"
}
] | 2024-08-07 | [
[
"Das",
"Anirban",
""
],
[
"Kurinsky",
"Noah",
""
],
[
"Leane",
"Rebecca K.",
""
]
] | We recently pointed out that power measurements of single quasiparticle devices can be used to detect dark matter. These devices have the lowest known energy thresholds, far surpassing standard direct detection experiments, requiring energy deposition above only about an meV. We calculate dark matter induced quasiparticle densities in transmon qubits, and use the latest transmon qubit measurements that provide one of the strongest existing lab-based bounds on dark matter-nucleon scattering below about 100 MeV. We strongly constrain sub-component dark matter, using both a dark matter population thermalized in the Earth as well as the dark matter wind from the Galactic halo. We demonstrate future potential sensitivities using devices with low quasiparticle densities. |
0910.2334 | Pijush Dhar kanti | D.K.Choudhury and Pijush Kanti Dhar | DGLAP equation and x-evolution of Non-singlet structure function in
Leading order | 31 pages, 12 EPS figures included in a LaTeX file to produce a single
gzipped tar file | null | null | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Study of parton distribution function (PDF) is a topic of significant
interest in QCD. To overcome the shortcomings of conventional PDFs, several
alternative methods have been suggested in recent years. The present work
reports the x distribution of the Non-singlet structure function in Leading
order using the complete solution of Taylor-approximated DGLAP equation. The
formalism is more general than the similar ones reported in recent literature.
Our predictions are compared with the CCFR neutrino data as well as exact
results.
| [
{
"created": "Tue, 13 Oct 2009 10:03:08 GMT",
"version": "v1"
}
] | 2009-10-14 | [
[
"Choudhury",
"D. K.",
""
],
[
"Dhar",
"Pijush Kanti",
""
]
] | Study of parton distribution function (PDF) is a topic of significant interest in QCD. To overcome the shortcomings of conventional PDFs, several alternative methods have been suggested in recent years. The present work reports the x distribution of the Non-singlet structure function in Leading order using the complete solution of Taylor-approximated DGLAP equation. The formalism is more general than the similar ones reported in recent literature. Our predictions are compared with the CCFR neutrino data as well as exact results. |
1210.0877 | Giancarlo D'Ambrosio | Giancarlo D'Ambrosio | Status of CP violation in Kaon systems | Presented at Flavor Physics and CP Violation (FPCP 2012), Hefei,
China, May 21-25, 2012; 9 pages, latex | null | null | null | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | CP violation is an important tool to test the Standard Model and his
extensions. We describe kaon physics observables testing CP violation and more
in general short distance physics. Channels under consideration will be K -> pi
nu nu, K -> pi l+ l-, K+- -> 3 pi, K+- -> pi +- pi gamma and K+- -> pi +- pi0
e+ e-
| [
{
"created": "Tue, 2 Oct 2012 18:56:05 GMT",
"version": "v1"
}
] | 2012-10-03 | [
[
"D'Ambrosio",
"Giancarlo",
""
]
] | CP violation is an important tool to test the Standard Model and his extensions. We describe kaon physics observables testing CP violation and more in general short distance physics. Channels under consideration will be K -> pi nu nu, K -> pi l+ l-, K+- -> 3 pi, K+- -> pi +- pi gamma and K+- -> pi +- pi0 e+ e- |
0811.0533 | Wolfgang Lucha | Wolfgang Lucha, D. Melikhov, S. Simula | Extracting Hadron Parameters from Dispersive Sum Rules | to appear in the proceedings of the 8th Conference on Quark
Confinement and the Hadron Spectrum | PoS Confinement8:180,2008 | null | HEPHY-PUB 867/08 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Puzzled or surprised by the almost incredible accuracy occasionally claimed
in the literature to be achievable for numerical outcomes of QCD sum-rule
analyses, we scrutinized the usual procedure employed for the extraction of the
parameters of individual bound states from dispersive sum rules by taking
advantage of the exact solvability of a quantum-mechanical harmonic-oscillator
model: It turns out that the determination of the ground-state parameters (that
is, decay constant and form factor) by requiring independence from the Borel
mass in its stability window does not necessarily yield their exact numerical
values. For instance, the comparison of the sum-rule predictions for
bound-state parameters with their numerical values known precisely in our
harmonic-oscillator model reveals that standard sum-rule procedures
underestimate the ground-state decay constant by some 4% and its form factor by
almost 15%; such systematic uncertainties cannot be inferred from our
correlators' accuracy better than 1% in the window of Borel stability: they are
uncontrollable.
| [
{
"created": "Tue, 4 Nov 2008 14:53:24 GMT",
"version": "v1"
}
] | 2009-06-25 | [
[
"Lucha",
"Wolfgang",
""
],
[
"Melikhov",
"D.",
""
],
[
"Simula",
"S.",
""
]
] | Puzzled or surprised by the almost incredible accuracy occasionally claimed in the literature to be achievable for numerical outcomes of QCD sum-rule analyses, we scrutinized the usual procedure employed for the extraction of the parameters of individual bound states from dispersive sum rules by taking advantage of the exact solvability of a quantum-mechanical harmonic-oscillator model: It turns out that the determination of the ground-state parameters (that is, decay constant and form factor) by requiring independence from the Borel mass in its stability window does not necessarily yield their exact numerical values. For instance, the comparison of the sum-rule predictions for bound-state parameters with their numerical values known precisely in our harmonic-oscillator model reveals that standard sum-rule procedures underestimate the ground-state decay constant by some 4% and its form factor by almost 15%; such systematic uncertainties cannot be inferred from our correlators' accuracy better than 1% in the window of Borel stability: they are uncontrollable. |
hep-ph/0204312 | Enrico Meggiolaro | Enrico Meggiolaro | The U(1) axial symmetry and the chiral transition in QCD | Talk given at the ``Workshop on Quark-Gluon Plasma and Relativistic
Heavy Ions'', Frascati (Italy), January 14th-18th, 2002 (QGP2002); 10 pages,
LaTeX file | null | 10.1142/9789812776532_0022 | IFUP-TH/2002-14 | hep-ph | null | We discuss the role of the U(1) axial symmetry for the phase structure of QCD
at finite temperature. We expect that, above a certain critical temperature,
also the U(1) axial symmetry will be restored. We will try to see if this
transition has (or has not) anything to do with the usual chiral transition:
various possible scenarios are discussed. In particular, we analyse a scenario
in which the U(1) axial symmetry is still broken above the chiral transitions.
We will show that this scenario can be consistently reproduced using an
effective Lagrangian model. A new order parameter is introduced for the U(1)
axial symmetry.
| [
{
"created": "Fri, 26 Apr 2002 15:46:06 GMT",
"version": "v1"
}
] | 2017-08-23 | [
[
"Meggiolaro",
"Enrico",
""
]
] | We discuss the role of the U(1) axial symmetry for the phase structure of QCD at finite temperature. We expect that, above a certain critical temperature, also the U(1) axial symmetry will be restored. We will try to see if this transition has (or has not) anything to do with the usual chiral transition: various possible scenarios are discussed. In particular, we analyse a scenario in which the U(1) axial symmetry is still broken above the chiral transitions. We will show that this scenario can be consistently reproduced using an effective Lagrangian model. A new order parameter is introduced for the U(1) axial symmetry. |
1006.5417 | Gabriel Sanchez-Colon | A. Garcia and G. Sanchez-Colon | Evidence against manifest right-handed currents in neutron beta decay | null | Phys.Rev.D81:014030,2010 | 10.1103/PhysRevD.81.014030 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Bounds and presence of manifest right handed currents in neutron beta decay
are reviewed. Assuming the unitarity of the Cabibbo-Kobayashi-Maskawa matrix,
current experimental situation imposes very stringent limits on the mixing
angle, $-0.00077<\zeta<0.00089$, and on the mass eigenstate, $M_2({\rm
GeV})\in(291.4,439.9)$, in contradiction with the established lower bound on
$M_2$.
| [
{
"created": "Mon, 28 Jun 2010 17:38:27 GMT",
"version": "v1"
}
] | 2010-11-19 | [
[
"Garcia",
"A.",
""
],
[
"Sanchez-Colon",
"G.",
""
]
] | Bounds and presence of manifest right handed currents in neutron beta decay are reviewed. Assuming the unitarity of the Cabibbo-Kobayashi-Maskawa matrix, current experimental situation imposes very stringent limits on the mixing angle, $-0.00077<\zeta<0.00089$, and on the mass eigenstate, $M_2({\rm GeV})\in(291.4,439.9)$, in contradiction with the established lower bound on $M_2$. |
1403.6472 | Ilya Feige | Ilya Feige and Matthew D. Schwartz | Hard-Soft-Collinear Factorization to All Orders | 88 pages. Version 3 is updated to match the PRD article | Phys. Rev. D 90, 105020 (2014) | 10.1103/PhysRevD.90.105020 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We provide a precise statement of hard-soft-collinear factorization of
scattering amplitudes and prove it to all orders in perturbation theory.
Factorization is formulated as the equality at leading power of scattering
amplitudes in QCD with other amplitudes in QCD computed from a product of
operator matrix elements. The equivalence is regulator independent and gauge
independent. As the formulation relates amplitudes to the same amplitudes with
additional soft or collinear particles, it includes as special cases the
factorization of soft currents and collinear splitting functions from generic
matrix elements, both of which are shown to be process independent to all
orders. We show that the overlapping soft-collinear region is naturally
accounted for by vacuum matrix elements of kinked Wilson lines. Although the
proof is self-contained, it combines techniques developed for the study of
pinch surfaces, scattering amplitudes, and effective field theory.
| [
{
"created": "Tue, 25 Mar 2014 20:00:16 GMT",
"version": "v1"
},
{
"created": "Fri, 6 Jun 2014 02:52:33 GMT",
"version": "v2"
},
{
"created": "Fri, 6 Mar 2015 17:45:29 GMT",
"version": "v3"
}
] | 2015-03-09 | [
[
"Feige",
"Ilya",
""
],
[
"Schwartz",
"Matthew D.",
""
]
] | We provide a precise statement of hard-soft-collinear factorization of scattering amplitudes and prove it to all orders in perturbation theory. Factorization is formulated as the equality at leading power of scattering amplitudes in QCD with other amplitudes in QCD computed from a product of operator matrix elements. The equivalence is regulator independent and gauge independent. As the formulation relates amplitudes to the same amplitudes with additional soft or collinear particles, it includes as special cases the factorization of soft currents and collinear splitting functions from generic matrix elements, both of which are shown to be process independent to all orders. We show that the overlapping soft-collinear region is naturally accounted for by vacuum matrix elements of kinked Wilson lines. Although the proof is self-contained, it combines techniques developed for the study of pinch surfaces, scattering amplitudes, and effective field theory. |
0801.0491 | Ki-Young Choi | Ki-Young Choi, Jihn E. Kim, Hyun Min Lee, Osamu Seto | Neutralino dark matter from heavy axino decay | 7 pages, 4 figures; references added, published version in Phys. Rev.
D | Phys.Rev.D77:123501,2008 | 10.1103/PhysRevD.77.123501 | IFT-UAM/CSIC -08-01 | hep-ph astro-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We consider cosmological consequences of a heavy axino, decaying to the
neutralino in R-parity conserving models. The importance and influence of the
axino decay on the resultant abundance of neutralino dark matter depends on the
lifetime and the energy density of axino. For a high reheating temperature
after inflation, copiously produced axinos dominate the energy density of the
universe and its decay produces a large amount of entropy. As a bonus, we
obtain that the upper bound on the reheating temperature after inflation via
gravitino decay can be moderated, because the entropy production by the axino
decay more or less dilutes the gravitinos.
| [
{
"created": "Thu, 3 Jan 2008 08:38:49 GMT",
"version": "v1"
},
{
"created": "Thu, 19 Jun 2008 12:52:43 GMT",
"version": "v2"
}
] | 2008-06-19 | [
[
"Choi",
"Ki-Young",
""
],
[
"Kim",
"Jihn E.",
""
],
[
"Lee",
"Hyun Min",
""
],
[
"Seto",
"Osamu",
""
]
] | We consider cosmological consequences of a heavy axino, decaying to the neutralino in R-parity conserving models. The importance and influence of the axino decay on the resultant abundance of neutralino dark matter depends on the lifetime and the energy density of axino. For a high reheating temperature after inflation, copiously produced axinos dominate the energy density of the universe and its decay produces a large amount of entropy. As a bonus, we obtain that the upper bound on the reheating temperature after inflation via gravitino decay can be moderated, because the entropy production by the axino decay more or less dilutes the gravitinos. |
1603.00420 | Christian Bogner | Christian Bogner | Generalizations of polylogarithms for Feynman integrals | Talk presented at ACAT 2016 at UTFSM, Valpara\'iso, Chile | null | 10.1088/1742-6596/762/1/012067 | null | hep-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this talk, we discuss recent progress in the application of
generalizations of polylogarithms in the symbolic computation of multi-loop
integrals. We briefly review the Maple program MPL which supports a certain
approach for the computation of Feynman integrals in terms of multiple
polylogarithms. Furthermore we discuss elliptic generalizations of
polylogarithms which have shown to be useful in the computation of the massive
two-loop sunrise integral.
| [
{
"created": "Tue, 1 Mar 2016 19:30:47 GMT",
"version": "v1"
}
] | 2016-12-21 | [
[
"Bogner",
"Christian",
""
]
] | In this talk, we discuss recent progress in the application of generalizations of polylogarithms in the symbolic computation of multi-loop integrals. We briefly review the Maple program MPL which supports a certain approach for the computation of Feynman integrals in terms of multiple polylogarithms. Furthermore we discuss elliptic generalizations of polylogarithms which have shown to be useful in the computation of the massive two-loop sunrise integral. |
1804.10393 | Shoaib Munir | Biswaranjan Das, Stefano Moretti, Shoaib Munir, Poulose Poulose | Quantum interference among heavy NMSSM Higgs bosons | 18 pages, 5 figures, 2 tables. Revised benchmark points and figures,
overall results and conclusions unchanged. Version to appear in PRD | Phys. Rev. D 98, 055020 (2018) | 10.1103/PhysRevD.98.055020 | KIAS-P18038 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In the Next-to-Minimal Supersymmetric Standard Model (NMSSM), it is possible
to have strong mass degeneracies between the new singlet-like scalar and the
heavy doublet-like scalar, as well as between the singlet-like and doublet-like
pseudoscalar Higgs states. When the difference in the masses of such states is
comparable with the sum of their widths, the quantum mechanical interference
between their propagators can become significant. We study these effects by
taking into account the full Higgs boson propagator matrix in the calculation
of the production process of $\tau^+\tau^-$ pairs in gluon fusion at the Large
Hadron Collider (LHC). We find that, while these interference effects are
sizeable, they are not resolvable in terms of the distributions of differential
cross sections, owing to the poor detector resolution of the $\tau^+\tau^-$
invariant mass. They are, however, identifiable via the inclusive cross
sections, which are subject to significant variations with respect to the
standard approaches, wherein the propagating Higgs bosons are treated
independently from one another. We quantify these effects for several
representative benchmark points, extracted from a large set of points, obtained
by numerical scanning of the NMSSM parameter space, that satisfy the most
important experimental constraints currently available.
| [
{
"created": "Fri, 27 Apr 2018 08:44:07 GMT",
"version": "v1"
},
{
"created": "Thu, 13 Sep 2018 03:09:22 GMT",
"version": "v2"
}
] | 2018-09-19 | [
[
"Das",
"Biswaranjan",
""
],
[
"Moretti",
"Stefano",
""
],
[
"Munir",
"Shoaib",
""
],
[
"Poulose",
"Poulose",
""
]
] | In the Next-to-Minimal Supersymmetric Standard Model (NMSSM), it is possible to have strong mass degeneracies between the new singlet-like scalar and the heavy doublet-like scalar, as well as between the singlet-like and doublet-like pseudoscalar Higgs states. When the difference in the masses of such states is comparable with the sum of their widths, the quantum mechanical interference between their propagators can become significant. We study these effects by taking into account the full Higgs boson propagator matrix in the calculation of the production process of $\tau^+\tau^-$ pairs in gluon fusion at the Large Hadron Collider (LHC). We find that, while these interference effects are sizeable, they are not resolvable in terms of the distributions of differential cross sections, owing to the poor detector resolution of the $\tau^+\tau^-$ invariant mass. They are, however, identifiable via the inclusive cross sections, which are subject to significant variations with respect to the standard approaches, wherein the propagating Higgs bosons are treated independently from one another. We quantify these effects for several representative benchmark points, extracted from a large set of points, obtained by numerical scanning of the NMSSM parameter space, that satisfy the most important experimental constraints currently available. |
1511.07150 | Till Martini | Till Martini, Peter Uwer | The Matrix Element Method at next-to-leading order accuracy | 6 pages, 3 figures, Presented by T. Martini at the XXXIX
International Conference of Theoretical Physics `Matter to the Deepest',
Ustro\'n, Poland, September 13th-18th, 2015 | Acta Physica Polonica Series B 11/2015; 46(11):2143 | 10.5506/APhysPolB.46.2143 | HU-EP-15/57 | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The Matrix Element Method (MEM) has proven beneficial to make maximal use of
the information available in experimental data. However, so far it has mostly
been used in Born approximation only. In this paper we discuss an extension to
NLO accuracy. As a prerequisite we present an efficient method to calculate
event weights for jet events at NLO accuracy. As illustration and proof of
concept we apply the method to the extraction of the top-quark mass in e+e-
annihilation. We observe significant differences when moving from LO to NLO
which may be relevant for the interpretation of top-quark mass measurements at
hadron colliders relying on the MEM.
| [
{
"created": "Mon, 23 Nov 2015 09:35:40 GMT",
"version": "v1"
}
] | 2015-11-30 | [
[
"Martini",
"Till",
""
],
[
"Uwer",
"Peter",
""
]
] | The Matrix Element Method (MEM) has proven beneficial to make maximal use of the information available in experimental data. However, so far it has mostly been used in Born approximation only. In this paper we discuss an extension to NLO accuracy. As a prerequisite we present an efficient method to calculate event weights for jet events at NLO accuracy. As illustration and proof of concept we apply the method to the extraction of the top-quark mass in e+e- annihilation. We observe significant differences when moving from LO to NLO which may be relevant for the interpretation of top-quark mass measurements at hadron colliders relying on the MEM. |
2205.03252 | Patricio Gaete | P. Gaete and J. A. Helay\"el-Neto | Vacuum material properties and Cherenkov radiation in Logarithmic
Electrodynamics | 8 pages | null | 10.1140/epjc/s10052-023-11280-w | null | hep-ph physics.optics | http://creativecommons.org/licenses/by/4.0/ | We study some observational signatures of nonlinearities of the
electromagnetic field. First to all we show the vital role played by
nonlinearities in triggering a material behavior of the vacuum with
$(\varepsilon > 0, \mu <0)$, which corresponds to a ferrimagnetic material.
Secondly, the permittivity and susceptibility induced by nonlinearities are
considered in order to obtain the refractive index via the dispersion relation
for logarithmic electrodynamics. Finally, we consider the electromagnetic
radiation produced by a moving charged particle interacting with a medium
characterized by nonlinearities of the electromagnetic field. To this end we
consider logarithmic electrodynamics. The result shows that the radiation is
driven by the medium through which the particle travels like the one that
happens in the Cherenkov effect.
| [
{
"created": "Fri, 6 May 2022 14:12:13 GMT",
"version": "v1"
}
] | 2023-03-01 | [
[
"Gaete",
"P.",
""
],
[
"Helayël-Neto",
"J. A.",
""
]
] | We study some observational signatures of nonlinearities of the electromagnetic field. First to all we show the vital role played by nonlinearities in triggering a material behavior of the vacuum with $(\varepsilon > 0, \mu <0)$, which corresponds to a ferrimagnetic material. Secondly, the permittivity and susceptibility induced by nonlinearities are considered in order to obtain the refractive index via the dispersion relation for logarithmic electrodynamics. Finally, we consider the electromagnetic radiation produced by a moving charged particle interacting with a medium characterized by nonlinearities of the electromagnetic field. To this end we consider logarithmic electrodynamics. The result shows that the radiation is driven by the medium through which the particle travels like the one that happens in the Cherenkov effect. |
0803.1571 | Robert Schulze | R. Schulze, M. Bluhm and B. Kampfer (Forschungszentrum Dresden
Rossendorf & Dresden, Tech. U.) | Equation of state for strongly interacting matter: collective effects,
Landau damping and predictions for LHC | Mar. 2008. 7 pp. Invited talk given at XLVI International Winter
Meeting on Nuclear Physics in Bormio, Italy, 20-26 Jan 2008 | null | null | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The equation of state (EOS) is of utmost importance for the description of
the hydrodynamic phase of strongly interacting matter in relativistic heavy-ion
collisions. Lattice QCD can provide useful information on the EOS, mainly for
small net baryon densities. The QCD quasiparticle model provides a means to map
lattice QCD results into regions relevant for a variety of experiments. We
report here on effects of collectives modes and damping on the EOS. Some
predictions for forthcoming heavy-ion collisions at LHC/ALICE are presented and
perspectives for deriving an EOS for FAIR/CBM are discussed.
| [
{
"created": "Tue, 11 Mar 2008 13:21:22 GMT",
"version": "v1"
}
] | 2008-03-12 | [
[
"Schulze",
"R.",
"",
"Forschungszentrum Dresden\n Rossendorf & Dresden, Tech. U."
],
[
"Bluhm",
"M.",
"",
"Forschungszentrum Dresden\n Rossendorf & Dresden, Tech. U."
],
[
"Kampfer",
"B.",
"",
"Forschungszentrum Dresden\n Rossendorf & Dresden, Tech. U."
]
] | The equation of state (EOS) is of utmost importance for the description of the hydrodynamic phase of strongly interacting matter in relativistic heavy-ion collisions. Lattice QCD can provide useful information on the EOS, mainly for small net baryon densities. The QCD quasiparticle model provides a means to map lattice QCD results into regions relevant for a variety of experiments. We report here on effects of collectives modes and damping on the EOS. Some predictions for forthcoming heavy-ion collisions at LHC/ALICE are presented and perspectives for deriving an EOS for FAIR/CBM are discussed. |
2405.11164 | Amarjit Soni | Amarjit Soni | Theory of CP angles measurement | Invited talk at the KM50 and Flavor Factory 2023 workshop held at KEK
Feb 9-11, 2023 to celebrate 50th anniversary of the paper (1973) by M.
Kobayashi and T. Maskawa on Theory of CP violation and Flavor Factory 2023 | null | null | null | hep-ph hep-ex hep-lat | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In the early 80's Sanda-san and collaborators wrote key papers on the direct
and clean determination of the unitarity angle $\phi_1$ ($\beta$). This
motivated many of us for analogously coming up with ways for direct and clean
determinations of the other two unitarity angles, $\phi_2 (\alpha)$ and $\phi_3
(\gamma)$. Current status of these direct determinations as well as our
expectations for when Belle-II has 50 $ab^{-1}$ of luminosity and LHCb with
some upgrades, will be given. In particular, it is emphasized that for direct
determination of $\phi_3$, Belle-II should be able to handle final states in
$D^0$ or $\bar D^0$ Dalitz decays, that contain one $\pi^0$ (which are
difficult for LHCb) then they may make further inroads in improving the
accuracy of $\phi_3$ determination. Early lattice inputs for constraining the
unitarity triangle (UT) are briefly recalled. Its crucial role in supporting
the Kobayashi-Maskawa theory of CP violation is emphasized. Over the years
lattice methods have made significant progress and latest constraints from
these for the UT will be discussed as well as compatibility with current direct
determinations and some comments on future outlook will be made.
| [
{
"created": "Sat, 18 May 2024 03:44:02 GMT",
"version": "v1"
}
] | 2024-05-21 | [
[
"Soni",
"Amarjit",
""
]
] | In the early 80's Sanda-san and collaborators wrote key papers on the direct and clean determination of the unitarity angle $\phi_1$ ($\beta$). This motivated many of us for analogously coming up with ways for direct and clean determinations of the other two unitarity angles, $\phi_2 (\alpha)$ and $\phi_3 (\gamma)$. Current status of these direct determinations as well as our expectations for when Belle-II has 50 $ab^{-1}$ of luminosity and LHCb with some upgrades, will be given. In particular, it is emphasized that for direct determination of $\phi_3$, Belle-II should be able to handle final states in $D^0$ or $\bar D^0$ Dalitz decays, that contain one $\pi^0$ (which are difficult for LHCb) then they may make further inroads in improving the accuracy of $\phi_3$ determination. Early lattice inputs for constraining the unitarity triangle (UT) are briefly recalled. Its crucial role in supporting the Kobayashi-Maskawa theory of CP violation is emphasized. Over the years lattice methods have made significant progress and latest constraints from these for the UT will be discussed as well as compatibility with current direct determinations and some comments on future outlook will be made. |
1910.06319 | Jared Evans | Jared A. Evans, Akshay Ghalsasi, Stefania Gori, Michele Tammaro, Jure
Zupan | Light Dark Matter from Entropy Dilution | 38 pages, 8 figures, to be published in JHEP, v2: ref added,
substantial revisions in free-streaming constraints, minor revisions
elsewhere | null | 10.1007/JHEP02(2020)151 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We show that a thermal relic which decouples from the standard model (SM)
plasma while relativistic can be a viable dark matter (DM) candidate, if the
decoupling is followed by a period of entropy dilution that heats up the SM,
but not the dark sector. Such diluted hot relics can be as light as a keV,
while accounting for the entirety of the DM, and not conflicting with
cosmological and astrophysical measurements. The requisite dilution can be
achieved via decays of a heavy state that dominates the energy budget of the
universe in the early matter dominated era. The heavy state decays into the SM
particles, heats up the SM plasma, and dilutes the hidden sector. The
interaction required to equilibrate the two sectors in the early universe
places a bound on the maximum possible dilution as a function of the decoupling
temperature. As an example of diluted hot relic DM we consider a light Dirac
fermion with a heavy dark photon mediator. We present constraints on the model
from terrestrial experiments (current and future), astrophysics, and cosmology.
| [
{
"created": "Mon, 14 Oct 2019 17:59:59 GMT",
"version": "v1"
},
{
"created": "Mon, 10 Feb 2020 22:37:37 GMT",
"version": "v2"
}
] | 2020-03-18 | [
[
"Evans",
"Jared A.",
""
],
[
"Ghalsasi",
"Akshay",
""
],
[
"Gori",
"Stefania",
""
],
[
"Tammaro",
"Michele",
""
],
[
"Zupan",
"Jure",
""
]
] | We show that a thermal relic which decouples from the standard model (SM) plasma while relativistic can be a viable dark matter (DM) candidate, if the decoupling is followed by a period of entropy dilution that heats up the SM, but not the dark sector. Such diluted hot relics can be as light as a keV, while accounting for the entirety of the DM, and not conflicting with cosmological and astrophysical measurements. The requisite dilution can be achieved via decays of a heavy state that dominates the energy budget of the universe in the early matter dominated era. The heavy state decays into the SM particles, heats up the SM plasma, and dilutes the hidden sector. The interaction required to equilibrate the two sectors in the early universe places a bound on the maximum possible dilution as a function of the decoupling temperature. As an example of diluted hot relic DM we consider a light Dirac fermion with a heavy dark photon mediator. We present constraints on the model from terrestrial experiments (current and future), astrophysics, and cosmology. |
hep-ph/0608077 | Cong-Feng Qiao | Junli Li and Cong-Feng Qiao | The Feasibility of Testing LHVTs in Charm Factory | 8 pages in LaTex, 3 eps form figures. To appear in PRD | Phys.Rev.D74:076003,2006 | 10.1103/PhysRevD.74.076003 | GUCAS-CPS-06-03 | hep-ph quant-ph | null | It is commonly believed that the LHVTs can be tested through measuring the
Bell's inequalities. This scheme, for the massive particle system, was
originally set up for the entangled K^0\bar{K^0} pair system from the \phi
factory. In this Letter we show that the J/\Psi -> K^0\bar{K^0} process is even
more realistic for this goal. We analyze the unique properties of J/\Psi in the
detection of basic quantum effects, and find that it is possible to use J/\Psi
decay as a test of LHVTs in the future \tau-Charm factory. Our analyses and
conclusions are generally also true for other heavy Onium decays.
| [
{
"created": "Mon, 7 Aug 2006 12:30:46 GMT",
"version": "v1"
},
{
"created": "Thu, 28 Sep 2006 01:48:16 GMT",
"version": "v2"
}
] | 2008-11-26 | [
[
"Li",
"Junli",
""
],
[
"Qiao",
"Cong-Feng",
""
]
] | It is commonly believed that the LHVTs can be tested through measuring the Bell's inequalities. This scheme, for the massive particle system, was originally set up for the entangled K^0\bar{K^0} pair system from the \phi factory. In this Letter we show that the J/\Psi -> K^0\bar{K^0} process is even more realistic for this goal. We analyze the unique properties of J/\Psi in the detection of basic quantum effects, and find that it is possible to use J/\Psi decay as a test of LHVTs in the future \tau-Charm factory. Our analyses and conclusions are generally also true for other heavy Onium decays. |
hep-ph/9308271 | null | A. Brignole, L.E. Ib\'a\~nez and C. Mu\~noz | Towards a Theory of Soft Terms for the Supersymmetric Standard Model | 50 pages, 10 figures , harvmac. Note added at the end of the paper.
Due to an error in the normalization of \mu,the soft parameter B_Z is
modified. Published in Nucl.Phys.B422(1994)125 | Nucl.Phys.B422:125-171,1994; ERRATUM-ibid.B436:747-748,1995 | 10.1016/0550-3213(94)00068-9 | FTUAM-26/93 | hep-ph hep-th | null | We perform a systematic analysis of the soft supersymmetry-breaking terms
arising from four-dimensional strings. The analysis does not assume any
specific supersymmetry-breaking mechanism but provides a means of parametrizing
our ignorance in a way consistent with some known properties of
four-dimensional strings. We introduce a {\it goldstino angle} parameter
$\theta $ which says where the source of supersymmetry-breaking resides, either
predominantly in the dilaton sector ($sin \theta =1$ limit) or in the rest of
the chiral fieds, notably the moduli ($sin\theta =0$ limit). All formulae for
soft parameters take particularly simple forms when written in terms of this
angle. The $sin\theta =1$ limit is (up to small corrections) universal. As
$sin\theta $ decreases, the model dependence increases and the resulting soft
terms may or may not be universal, depending on the model. General expressions
for the soft terms as functions of $\theta$ for generic four-dimensional
strings are provided. For each {\it given} string model, one trades the four
soft parameters ($M,m,A,B$) of the minimal supersymmetric standard model by the
two parameters $m_{3/2}$ (gravitino mass) and $sin\theta $. The role of complex
phases and the associated constraints from limits on the electric dipole moment
of the neutron are discussed. It is also emphasized the importance of treating
the problem of the cosmological constant in a self-consistent manner.
| [
{
"created": "Fri, 13 Aug 1993 09:49:26 GMT",
"version": "v1"
},
{
"created": "Fri, 10 Sep 1993 13:38:35 GMT",
"version": "v2"
},
{
"created": "Wed, 4 Jan 1995 10:55:29 GMT",
"version": "v3"
}
] | 2010-02-18 | [
[
"Brignole",
"A.",
""
],
[
"Ibáñez",
"L. E.",
""
],
[
"Muñoz",
"C.",
""
]
] | We perform a systematic analysis of the soft supersymmetry-breaking terms arising from four-dimensional strings. The analysis does not assume any specific supersymmetry-breaking mechanism but provides a means of parametrizing our ignorance in a way consistent with some known properties of four-dimensional strings. We introduce a {\it goldstino angle} parameter $\theta $ which says where the source of supersymmetry-breaking resides, either predominantly in the dilaton sector ($sin \theta =1$ limit) or in the rest of the chiral fieds, notably the moduli ($sin\theta =0$ limit). All formulae for soft parameters take particularly simple forms when written in terms of this angle. The $sin\theta =1$ limit is (up to small corrections) universal. As $sin\theta $ decreases, the model dependence increases and the resulting soft terms may or may not be universal, depending on the model. General expressions for the soft terms as functions of $\theta$ for generic four-dimensional strings are provided. For each {\it given} string model, one trades the four soft parameters ($M,m,A,B$) of the minimal supersymmetric standard model by the two parameters $m_{3/2}$ (gravitino mass) and $sin\theta $. The role of complex phases and the associated constraints from limits on the electric dipole moment of the neutron are discussed. It is also emphasized the importance of treating the problem of the cosmological constant in a self-consistent manner. |
hep-ph/9504421 | Schwesinger | Bernd Schwesinger | BARYON-BARYON INTERACTIONS IN LARGE N_C CHIRAL PERTURBATION THEORY | 18 pages, REVTEX, 8 uuencoded PS figures appended | Phys.Rev. D52 (1995) 5326-5333 | 10.1103/PhysRevD.52.5326 | SI-95-TP3S1 | hep-ph nucl-th | null | Interactions of two baryons are considered in large $N_C$ chiral perturbation
theory and compared to the interactions derived from the Skyrme model. Special
attention is given to a torus-like configuration known to be present in the
Skyrme model.
| [
{
"created": "Thu, 27 Apr 1995 11:54:12 GMT",
"version": "v1"
}
] | 2009-10-28 | [
[
"Schwesinger",
"Bernd",
""
]
] | Interactions of two baryons are considered in large $N_C$ chiral perturbation theory and compared to the interactions derived from the Skyrme model. Special attention is given to a torus-like configuration known to be present in the Skyrme model. |
1905.02975 | Vincenzo Branchina | Vincenzo Branchina, Eloisa Bentivegna, Filippo Contino, Dario
Zappal\`a | Direct Higgs-gravity interaction and stability of our Universe | 5 pages, 4 figures | null | 10.1103/PhysRevD.99.096029 | null | hep-ph gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The Higgs effective potential becomes unstable at approximately $10^{11}$
GeV, and if only standard model interactions are considered, the lifetime
$\tau$ of the electroweak vacuum turns out to be much larger than the age of
the Universe $T_U$. It is well known, however, that $\tau$ is extremely
sensitive to the presence of unknown new physics: the latter can enormously
lower $\tau$. This poses a serious problem for the stability of our Universe,
demanding for a physical mechanism that protects it from a disastrous decay. We
have found that there exists a universal stabilizing mechanism that naturally
originates from the nonminimal coupling between gravity and the Higgs boson. As
this Higgs-gravity interaction necessarily arises from the quantum dynamics of
the Higgs field in a gravitational background, this stabilizing mechanism is
certainly present. It is not related to any specific model, being rather
natural and universal as it comes from fundamental pillars of our physical
world: gravity, the Higgs field, the quantum nature of physical laws.
| [
{
"created": "Wed, 8 May 2019 09:26:05 GMT",
"version": "v1"
}
] | 2019-06-26 | [
[
"Branchina",
"Vincenzo",
""
],
[
"Bentivegna",
"Eloisa",
""
],
[
"Contino",
"Filippo",
""
],
[
"Zappalà",
"Dario",
""
]
] | The Higgs effective potential becomes unstable at approximately $10^{11}$ GeV, and if only standard model interactions are considered, the lifetime $\tau$ of the electroweak vacuum turns out to be much larger than the age of the Universe $T_U$. It is well known, however, that $\tau$ is extremely sensitive to the presence of unknown new physics: the latter can enormously lower $\tau$. This poses a serious problem for the stability of our Universe, demanding for a physical mechanism that protects it from a disastrous decay. We have found that there exists a universal stabilizing mechanism that naturally originates from the nonminimal coupling between gravity and the Higgs boson. As this Higgs-gravity interaction necessarily arises from the quantum dynamics of the Higgs field in a gravitational background, this stabilizing mechanism is certainly present. It is not related to any specific model, being rather natural and universal as it comes from fundamental pillars of our physical world: gravity, the Higgs field, the quantum nature of physical laws. |
2301.08767 | Aniket Joglekar | Gerardo Alvarez, Aniket Joglekar, Mehrdad Phoroutan-Mehr, Hai-Bo Yu | Heating Neutron Stars with Inelastic Dark Matter and Relativistic
Targets | 25 pages, 6 figures | null | 10.1103/PhysRevD.107.103024 | LAPTH-001/23 | hep-ph astro-ph.HE | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The dense environment of neutron stars makes them an excellent target for
probing dark matter interactions with the Standard Model. We study neutron star
heating from capture of inelastic dark matter, which can evade direct detection
constraints. We investigate kinematics of the inelastic scattering process
between quasirelativistic dark matter particles and ultrarelativistic targets
in neutron stars, and derive analytical expressions for the maximal mass gap
allowed for the scattering to occur. We implement them into a fully
relativistic formalism for calculating the capture rate and apply it to various
scenarios of inelastic dark matter. The projected constraints from neutron
stars can systematically surpass those from terrestrial searches, including
direct detection and collider experiments. Neutron stars can also be sensitive
to the parameter space of inelastic self-interacting dark matter. Our results
indicate that extreme astrophysical environments, such as neutron stars, are an
important target for searching dark matter.
| [
{
"created": "Fri, 20 Jan 2023 19:03:58 GMT",
"version": "v1"
}
] | 2023-05-24 | [
[
"Alvarez",
"Gerardo",
""
],
[
"Joglekar",
"Aniket",
""
],
[
"Phoroutan-Mehr",
"Mehrdad",
""
],
[
"Yu",
"Hai-Bo",
""
]
] | The dense environment of neutron stars makes them an excellent target for probing dark matter interactions with the Standard Model. We study neutron star heating from capture of inelastic dark matter, which can evade direct detection constraints. We investigate kinematics of the inelastic scattering process between quasirelativistic dark matter particles and ultrarelativistic targets in neutron stars, and derive analytical expressions for the maximal mass gap allowed for the scattering to occur. We implement them into a fully relativistic formalism for calculating the capture rate and apply it to various scenarios of inelastic dark matter. The projected constraints from neutron stars can systematically surpass those from terrestrial searches, including direct detection and collider experiments. Neutron stars can also be sensitive to the parameter space of inelastic self-interacting dark matter. Our results indicate that extreme astrophysical environments, such as neutron stars, are an important target for searching dark matter. |
hep-ph/0409236 | Stephen Godfrey | Stephen Godfrey | P-Wave Charm Mesons as a Window to the D_{sJ} States | 3 pages, contributed to the 2004 DPF meeting, Riverside CA, Aug
26-31, 2004 Uses ws-ijmpa.cls (World Scientific, included). Corrected
reference | Int.J.Mod.Phys.A20:3771-3773,2005 | 10.1142/S0217751X05027576 | null | hep-ph hep-ex | null | In my talk I discussed the properties of the newly discovered D_{sJ}^*(2317),
D_{sJ}(2460), X(3872), and SELEX D^*_{sJ}(2632) states and suggested
experimental measurements that can shed light on them. In this writeup I
concentrate on an important facet of understanding the D_{sJ} states, the
properties of the closely related D_0^* and D_1' states. These states are well
described as the broad, j=1/2 non-strange charmed P-wave mesons.
| [
{
"created": "Mon, 20 Sep 2004 21:18:14 GMT",
"version": "v1"
},
{
"created": "Tue, 28 Sep 2004 14:11:49 GMT",
"version": "v2"
}
] | 2011-04-11 | [
[
"Godfrey",
"Stephen",
""
]
] | In my talk I discussed the properties of the newly discovered D_{sJ}^*(2317), D_{sJ}(2460), X(3872), and SELEX D^*_{sJ}(2632) states and suggested experimental measurements that can shed light on them. In this writeup I concentrate on an important facet of understanding the D_{sJ} states, the properties of the closely related D_0^* and D_1' states. These states are well described as the broad, j=1/2 non-strange charmed P-wave mesons. |
1302.4524 | Eugene Levin | E. Gotsman,(Tel Aviv Un.), E. Levin (Tel Aviv Un./UTFSM) and U. Maor
(Tel Aviv Un.) | Diffraction Production in a Soft Interaction Model: Mass Distributions | 7 pages, 19 figures | null | 10.1103/PhysRevD.87.071501 | TAUP 2962/13 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In the framework of our model (GLM) for soft interaction with
$\alpha'_{\pom}(0)=0$, we propose a procedure based on Gribov's partonic
interpretation of the Pomeron, which enables one to calculate the diffractive
mass distributions in hadron-hadron scattering. Using the analogy with
deep-inelastic scattering, we associate the Pomeron-quark interaction with the
Good-Walker sector of the hadron-hadron scattering, and the Pomeron-gluon
sector with the t-channel Pomeron interactions. We present predicted mass
distributions for the LHC energies
| [
{
"created": "Tue, 19 Feb 2013 06:20:13 GMT",
"version": "v1"
}
] | 2013-04-17 | [
[
"Gotsman",
"E.",
"",
"Tel Aviv Un./UTFSM"
],
[
"Levin",
"E.",
"",
"Tel Aviv Un./UTFSM"
],
[
"Maor",
"U.",
"",
"Tel Aviv Un."
]
] | In the framework of our model (GLM) for soft interaction with $\alpha'_{\pom}(0)=0$, we propose a procedure based on Gribov's partonic interpretation of the Pomeron, which enables one to calculate the diffractive mass distributions in hadron-hadron scattering. Using the analogy with deep-inelastic scattering, we associate the Pomeron-quark interaction with the Good-Walker sector of the hadron-hadron scattering, and the Pomeron-gluon sector with the t-channel Pomeron interactions. We present predicted mass distributions for the LHC energies |
1411.2126 | Jo\~ao Moreira | J. Moreira, B. Hiller, W. Broniowski, A. A. Osipov, A. H. Blin | Non-uniform phases in a three-flavour 't Hooft extended
Nambu-Jona--Lasinio model | To appear in the proceedings for Workshop on Unquenched Hadron
Spectroscopy: Non-Perturbative Models and Methods of QCD vs. Experiment. 6
pages, 4 figures (minor revisions in this version) | null | null | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The possible existence of non-uniform phases in cold dense quark matter in
the light quark sector ($u$, $d$ and $s$) is addressed using the
Nambu-Jona--Lasinio Model extended to include flavour-mixing 't Hooft
determinant. The effect of changes in the coupling strengths of the model is
discussed. It is seen that the inclusion of the strange sector catalyses the
appearance of these non-uniform phases extending the domain for their
appearance.
| [
{
"created": "Sat, 8 Nov 2014 15:24:11 GMT",
"version": "v1"
},
{
"created": "Mon, 17 Nov 2014 14:41:47 GMT",
"version": "v2"
}
] | 2014-11-18 | [
[
"Moreira",
"J.",
""
],
[
"Hiller",
"B.",
""
],
[
"Broniowski",
"W.",
""
],
[
"Osipov",
"A. A.",
""
],
[
"Blin",
"A. H.",
""
]
] | The possible existence of non-uniform phases in cold dense quark matter in the light quark sector ($u$, $d$ and $s$) is addressed using the Nambu-Jona--Lasinio Model extended to include flavour-mixing 't Hooft determinant. The effect of changes in the coupling strengths of the model is discussed. It is seen that the inclusion of the strange sector catalyses the appearance of these non-uniform phases extending the domain for their appearance. |
hep-ph/9707387 | Wally Melnitchouk | W. Melnitchouk (U. Maryland) and A.W. Thomas (U. Adelaide) | HERA Anomaly and Hard Charm in the Nucleon | extra figure included, version to appear in Phys. Lett. B | Phys.Lett.B414:134-139,1997 | 10.1016/S0370-2693(97)01150-7 | UMD PP 98-003, ADP-97-25/T260 | hep-ph nucl-th | null | We explore the possibility that the excess neutral and charged current events
seen by the H1 and ZEUS Collaborations at HERA at large x and Q^2 could arise
from a hard charm component of the nucleon. While the symmetric intrinsic charm
hypothesis is unable to account for the HERA anomaly, a non-symmetric charm
distribution generated non-perturbatively, for which c-bar is much harder than
c, can produce significant enhancement of cross sections at the HERA
kinematics.
| [
{
"created": "Fri, 18 Jul 1997 02:54:18 GMT",
"version": "v1"
},
{
"created": "Mon, 15 Sep 1997 05:56:52 GMT",
"version": "v2"
}
] | 2008-11-26 | [
[
"Melnitchouk",
"W.",
"",
"U. Maryland"
],
[
"Thomas",
"A. W.",
"",
"U. Adelaide"
]
] | We explore the possibility that the excess neutral and charged current events seen by the H1 and ZEUS Collaborations at HERA at large x and Q^2 could arise from a hard charm component of the nucleon. While the symmetric intrinsic charm hypothesis is unable to account for the HERA anomaly, a non-symmetric charm distribution generated non-perturbatively, for which c-bar is much harder than c, can produce significant enhancement of cross sections at the HERA kinematics. |
2307.14173 | Jonathan Agil | J. Agil and D. Bakalov and R. Battesti and C. Rizzo | On the Positronium g-factor | Submitted to EPJD | Eur. Phys. J. D (2023) 77, 196 | 10.1140/epjd/s10053-023-00779-2 | null | hep-ph physics.atom-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this letter, we recall the main facts concerning the g-factor of
positronium and we show how the value of the g-factor of the positronium is
important. Taking it better into consideration may provide a solution to the
reported discrepancy between QED theory and experiments concerning the
hyperfine splitting of the fundamental level of the positronium. We also give
the only experimental value that existing experiments can provide,
$g_{\mathrm{Ps}}=2.0023\pm 0.0012$ at $3\sigma$.
| [
{
"created": "Wed, 26 Jul 2023 12:56:59 GMT",
"version": "v1"
},
{
"created": "Tue, 31 Oct 2023 16:27:39 GMT",
"version": "v2"
}
] | 2023-11-14 | [
[
"Agil",
"J.",
""
],
[
"Bakalov",
"D.",
""
],
[
"Battesti",
"R.",
""
],
[
"Rizzo",
"C.",
""
]
] | In this letter, we recall the main facts concerning the g-factor of positronium and we show how the value of the g-factor of the positronium is important. Taking it better into consideration may provide a solution to the reported discrepancy between QED theory and experiments concerning the hyperfine splitting of the fundamental level of the positronium. We also give the only experimental value that existing experiments can provide, $g_{\mathrm{Ps}}=2.0023\pm 0.0012$ at $3\sigma$. |
2001.04019 | Moinul Hossain Rahat | M. Jay P\'erez, Moinul Hossain Rahat, Pierre Ramond, Alexander J.
Stuart, Bin Xu | Tribimaximal Mixing in the $SU(5) \times \mathcal{T}_{13}$ Texture | 36 pages, 2 figures, minor changes to match with the published
version | Phys. Rev. D 101, 075018 (2020) | 10.1103/PhysRevD.101.075018 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We extend the recently proposed $SU(5) \times \mathcal{T}_{13}$ model for the
asymmetric texture to the up-type quark and seesaw sectors. The hierarchical
up-type quark masses are generated from higher-dimensional operators involving
family-singlet Higgses, gauge-singlet familons, and vectorlike messengers. The
complex-tribimaximal (TBM) seesaw mixing arises from the vacuum structure of a
minimal number of familons, resulting in an alignment between the Yukawa and
Majorana matrices of the seesaw formula. Introducing four right-handed
neutrinos, normal ordering of the light neutrino masses is obtained, with
$m_{\nu_1} = 27.6\ \mathrm{meV}$, $m_{\nu_2} = 28.9\ \mathrm{meV}$ and
$m_{\nu_3} = 57.8\ \mathrm{meV}$. Their sum almost saturates Planck's
cosmological upper bound ($120$ $\text{meV}$). The right-handed neutrino masses
are expressed in terms of two parameters for a particular choice of familon
vacuum alignment. We predict the $\require{cancel}\cancel{CP}$
Jarlskog-Greenberg invariant to be $|\mathcal{J}| = 0.028$, consistent with the
current PDG estimate, and Majorana invariants $|\mathcal{I}_1| = 0.106$ and
$|\mathcal{I}_2| = 0.011$. A sign ambiguity in the model parameters leads to
two possibilities for the invariant mass parameter $|m_{\beta \beta}|$: $13.02$
or $25.21$ $\text{meV}$, both within an order of magnitude of the most rigorous
experimental upper limit ($61$--$165$ $\text{meV}$).
| [
{
"created": "Mon, 13 Jan 2020 00:34:06 GMT",
"version": "v1"
},
{
"created": "Sun, 12 Apr 2020 16:57:37 GMT",
"version": "v2"
}
] | 2020-04-15 | [
[
"Pérez",
"M. Jay",
""
],
[
"Rahat",
"Moinul Hossain",
""
],
[
"Ramond",
"Pierre",
""
],
[
"Stuart",
"Alexander J.",
""
],
[
"Xu",
"Bin",
""
]
] | We extend the recently proposed $SU(5) \times \mathcal{T}_{13}$ model for the asymmetric texture to the up-type quark and seesaw sectors. The hierarchical up-type quark masses are generated from higher-dimensional operators involving family-singlet Higgses, gauge-singlet familons, and vectorlike messengers. The complex-tribimaximal (TBM) seesaw mixing arises from the vacuum structure of a minimal number of familons, resulting in an alignment between the Yukawa and Majorana matrices of the seesaw formula. Introducing four right-handed neutrinos, normal ordering of the light neutrino masses is obtained, with $m_{\nu_1} = 27.6\ \mathrm{meV}$, $m_{\nu_2} = 28.9\ \mathrm{meV}$ and $m_{\nu_3} = 57.8\ \mathrm{meV}$. Their sum almost saturates Planck's cosmological upper bound ($120$ $\text{meV}$). The right-handed neutrino masses are expressed in terms of two parameters for a particular choice of familon vacuum alignment. We predict the $\require{cancel}\cancel{CP}$ Jarlskog-Greenberg invariant to be $|\mathcal{J}| = 0.028$, consistent with the current PDG estimate, and Majorana invariants $|\mathcal{I}_1| = 0.106$ and $|\mathcal{I}_2| = 0.011$. A sign ambiguity in the model parameters leads to two possibilities for the invariant mass parameter $|m_{\beta \beta}|$: $13.02$ or $25.21$ $\text{meV}$, both within an order of magnitude of the most rigorous experimental upper limit ($61$--$165$ $\text{meV}$). |
hep-ph/0408197 | Adam Szczepaniak | Nikodem J. Poplawski, Adam P. Szczepaniak, J.T. Londergan | Towards a Relativistic Description of Exotic Meson Decays | 14 pages, 7 figures | Phys.Rev. D71 (2005) 016004 | 10.1103/PhysRevD.71.016004 | null | hep-ph | null | This work analyses hadronic decays of exotic mesons, with a focus on the
lightest one, the $J^{PC}=1^{-+}$ $\pi_{1}$, in a fully relativistic formalism,
and makes comparisons with non-relativistic results. We also discuss Coulomb
gauge decays of normal mesons that proceed through their hybrid components. The
relativistic spin wave functions of mesons and hybrids are constructed based on
unitary representations of the Lorentz group. The radial wave functions are
obtained from phenomenological considerations of the mass operator. Fully
relativistic results (with Wigner rotations) differ significantly from
non-relativistic ones. We also find that the decay channels $\pi_{1}\to\pi
b_{1}, \pi f_{1}, KK_{1}$ are favored, in agreement with results obtained using
other models.
| [
{
"created": "Wed, 18 Aug 2004 01:24:39 GMT",
"version": "v1"
}
] | 2009-11-10 | [
[
"Poplawski",
"Nikodem J.",
""
],
[
"Szczepaniak",
"Adam P.",
""
],
[
"Londergan",
"J. T.",
""
]
] | This work analyses hadronic decays of exotic mesons, with a focus on the lightest one, the $J^{PC}=1^{-+}$ $\pi_{1}$, in a fully relativistic formalism, and makes comparisons with non-relativistic results. We also discuss Coulomb gauge decays of normal mesons that proceed through their hybrid components. The relativistic spin wave functions of mesons and hybrids are constructed based on unitary representations of the Lorentz group. The radial wave functions are obtained from phenomenological considerations of the mass operator. Fully relativistic results (with Wigner rotations) differ significantly from non-relativistic ones. We also find that the decay channels $\pi_{1}\to\pi b_{1}, \pi f_{1}, KK_{1}$ are favored, in agreement with results obtained using other models. |
hep-ph/0108083 | Hou Defu | Zhang Benwei, Hou Defu and Li Jiarong | The multiple solutions of self-consistency condition in Walecka model
and the validity of the Brown-Rho scaling law | 10 pages in Revtex with 9 figures | Phys.Rev. C61 (2000) 051302 | 10.1103/PhysRevC.61.051302 | null | hep-ph | null | We investigate the self-consistency condition (SCC) of mean-field theory in
Walecka model and find that the solutions of the SCC are multiple at high
temperature and chemical potential. Using the effective Lagrangian approach, we
study medium effects on the $\omega$ meson mass by taking into account of
vacuum effects. We show that the $\omega$ meson mass decreases with both
temperature and chemical potential with a general tendency, while near the
critical point several $\omega$ meson masses become degenerate due to the
multiple solutions of the SCC. We check the validity of Brown-Rho scaling law
in this case. Finally, we calculate the thermodynamic potential and prove that
the multiple solutions of the SCC result from a first-order phase transition of
nuclear matter in the Walecka model at high temperature and chemical potential.
| [
{
"created": "Wed, 8 Aug 2001 22:07:42 GMT",
"version": "v1"
}
] | 2009-11-07 | [
[
"Benwei",
"Zhang",
""
],
[
"Defu",
"Hou",
""
],
[
"Jiarong",
"Li",
""
]
] | We investigate the self-consistency condition (SCC) of mean-field theory in Walecka model and find that the solutions of the SCC are multiple at high temperature and chemical potential. Using the effective Lagrangian approach, we study medium effects on the $\omega$ meson mass by taking into account of vacuum effects. We show that the $\omega$ meson mass decreases with both temperature and chemical potential with a general tendency, while near the critical point several $\omega$ meson masses become degenerate due to the multiple solutions of the SCC. We check the validity of Brown-Rho scaling law in this case. Finally, we calculate the thermodynamic potential and prove that the multiple solutions of the SCC result from a first-order phase transition of nuclear matter in the Walecka model at high temperature and chemical potential. |
0909.1749 | Apostolos Pilaftsis | J. S. Lee, Y. Peters, A. Pilaftsis and C. Schwanenberger | Strangephilic Higgs Bosons in the MSSM | 18 pages, 7 eps figures, additional comments and references added,
version as to appear in European Physical Journal C | Eur.Phys.J.C66:261-269,2010 | 10.1140/epjc/s10052-010-1248-z | MAN/HEP/2009/32 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We suggest a new CPX-derived scenario for the search of strangephilic MSSM
Higgs bosons at the Tevatron and the LHC, in which all neutral and charged
Higgs bosons decay predominantly into pairs of strange quarks and into a
strange and a charm quark, respectively. The proposed scenario is realized
within a particular region of the MSSM parameter space and requires large
values of tan(beta), where threshold radiative corrections are significant to
render the effective strange-quark Yukawa coupling dominant. Experimental
searches for neutral Higgs bosons based on the identification of b-quark jets
or tau leptons may miss a strangephilic Higgs boson and its existence could be
inferred indirectly by searching for hadronically decaying charged Higgs
bosons. Potential strategies and experimental challenges to search for
strangephilic Higgs bosons at the Tevatron and the LHC are discussed.
| [
{
"created": "Wed, 9 Sep 2009 17:27:14 GMT",
"version": "v1"
},
{
"created": "Thu, 10 Sep 2009 13:18:48 GMT",
"version": "v2"
},
{
"created": "Wed, 14 Oct 2009 11:32:34 GMT",
"version": "v3"
},
{
"created": "Thu, 14 Jan 2010 17:18:52 GMT",
"version": "v4"
}
] | 2014-11-20 | [
[
"Lee",
"J. S.",
""
],
[
"Peters",
"Y.",
""
],
[
"Pilaftsis",
"A.",
""
],
[
"Schwanenberger",
"C.",
""
]
] | We suggest a new CPX-derived scenario for the search of strangephilic MSSM Higgs bosons at the Tevatron and the LHC, in which all neutral and charged Higgs bosons decay predominantly into pairs of strange quarks and into a strange and a charm quark, respectively. The proposed scenario is realized within a particular region of the MSSM parameter space and requires large values of tan(beta), where threshold radiative corrections are significant to render the effective strange-quark Yukawa coupling dominant. Experimental searches for neutral Higgs bosons based on the identification of b-quark jets or tau leptons may miss a strangephilic Higgs boson and its existence could be inferred indirectly by searching for hadronically decaying charged Higgs bosons. Potential strategies and experimental challenges to search for strangephilic Higgs bosons at the Tevatron and the LHC are discussed. |
1703.06289 | Xiao-Gang He | Cheng-Wei Chiang, Xiao-Gang He, Fang Ye, Xing-Bo Yuan | Constraints and Implications on Higgs FCNC Couplings from Precision
Measurement of $B_s \to \mu^+\mu^-$ Decay | 21 pages, 5 figures. Updated the paper with new results from LHC on h
to mu tau | Phys. Rev. D 96, 035032 (2017) | 10.1103/PhysRevD.96.035032 | NCTS-PH1704 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study constraints and implications of the recent LHCb measurement of
${\cal B}(B_s \to \mu^+\mu^-)$ for tree-level Higgs-mediated flavor-changing
neutral current (FCNC) interactions. Combined with experimental data on $B_s$
mass difference $\Delta m_s$, the $h \to \mu \tau$, and the $h \to
\tau^+\tau^-$ decay branching ratios from the LHC, we find that the Higgs FCNC
couplings are severely constrained. The allowed regions for $B_s \to \mu \tau$,
$\tau\tau$ and $h \to sb$ decays are obtained. Current data allow large CP
violation in the $h \to \tau^+ \tau^-$ decay. Consequences of the Cheng-Sher
ansatz for the Higgs Yukawa couplings are discussed in some detail.
| [
{
"created": "Sat, 18 Mar 2017 12:27:16 GMT",
"version": "v1"
},
{
"created": "Thu, 23 Mar 2017 07:05:37 GMT",
"version": "v2"
},
{
"created": "Fri, 9 Jun 2017 01:24:42 GMT",
"version": "v3"
}
] | 2017-09-06 | [
[
"Chiang",
"Cheng-Wei",
""
],
[
"He",
"Xiao-Gang",
""
],
[
"Ye",
"Fang",
""
],
[
"Yuan",
"Xing-Bo",
""
]
] | We study constraints and implications of the recent LHCb measurement of ${\cal B}(B_s \to \mu^+\mu^-)$ for tree-level Higgs-mediated flavor-changing neutral current (FCNC) interactions. Combined with experimental data on $B_s$ mass difference $\Delta m_s$, the $h \to \mu \tau$, and the $h \to \tau^+\tau^-$ decay branching ratios from the LHC, we find that the Higgs FCNC couplings are severely constrained. The allowed regions for $B_s \to \mu \tau$, $\tau\tau$ and $h \to sb$ decays are obtained. Current data allow large CP violation in the $h \to \tau^+ \tau^-$ decay. Consequences of the Cheng-Sher ansatz for the Higgs Yukawa couplings are discussed in some detail. |
1101.4679 | Mart\'in Gonz\'alez-Alonso | Mart\'in Gonz\'alez-Alonso | New Physics bounds from CKM-unitarity | To appear in the proceedings of the 45th Rencontres de Moriond:
Electroweak Interactions and Unified Theories, La Thuile, Aosta Valley,
Italy, 6-13 Mar 2010 | null | null | IFIC/10-26, FTUV-11-0124, NPAC-11-04 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Using an effective field theory approach, we study the new physics (NP)
corrections to muon and beta decays and their effects on the extractions of
V_ud and V_us. Assuming nearly flavor blind NP interactions we find that the
CKM-unitarity test is the only way to expose NP. The four short-distance
operators that can generate a deviation are strongly constrained by the
phenomenological bound |Vud|^2 + |Vus|^2 + |Vub|^2 - 1 = (-0.0001 \pm 0.0006),
corresponding to an effective scale > 11 TeV (90% CL). Depending on the
operator, this constraint is at the same level or better than that generated by
the Z pole observables.
| [
{
"created": "Mon, 24 Jan 2011 22:04:41 GMT",
"version": "v1"
},
{
"created": "Thu, 10 Feb 2011 22:32:20 GMT",
"version": "v2"
}
] | 2011-02-14 | [
[
"González-Alonso",
"Martín",
""
]
] | Using an effective field theory approach, we study the new physics (NP) corrections to muon and beta decays and their effects on the extractions of V_ud and V_us. Assuming nearly flavor blind NP interactions we find that the CKM-unitarity test is the only way to expose NP. The four short-distance operators that can generate a deviation are strongly constrained by the phenomenological bound |Vud|^2 + |Vus|^2 + |Vub|^2 - 1 = (-0.0001 \pm 0.0006), corresponding to an effective scale > 11 TeV (90% CL). Depending on the operator, this constraint is at the same level or better than that generated by the Z pole observables. |
hep-ph/9710513 | Christian Bauer | Christian Bauer | Corrections to Moments of the Photon Spectrum in the Inclusive Decay B
\to X_s \gamma | 18 pages, 6 figures, revtex, changes to analytical results,
conclusions unchanged, submitted as an Erratum to Phys.Rev. D | Phys.Rev.D57:5611-5619,1998; Erratum-ibid.D60:099907,1999 | 10.1103/PhysRevD.57.5611 10.1103/PhysRevD.60.099907 | UTPT--97-19 | hep-ph | null | We investigate the two main uncertainties on the extraction of the
nonperturbative matrix elements $\bar{\Lambda}$ and $\lambda_1$ from moments of
the inclusive rare FCNC decay $B \to X_s \gamma$. The first one is due to
unknown matrix elements of higher dimensional operators which are estimated by
varying the matrix elements in a range as suggested by dimensional analysis.
The effect of these terms is found to be small. A second uncertainty arises
from a cut on the photon energy and we give model independent bounds on these
uncertainties as well as their estimates from a simplified version of the ACCMM
model.
| [
{
"created": "Wed, 29 Oct 1997 01:11:29 GMT",
"version": "v1"
},
{
"created": "Wed, 11 Mar 1998 20:38:05 GMT",
"version": "v2"
},
{
"created": "Fri, 25 Jun 1999 00:42:38 GMT",
"version": "v3"
}
] | 2014-11-17 | [
[
"Bauer",
"Christian",
""
]
] | We investigate the two main uncertainties on the extraction of the nonperturbative matrix elements $\bar{\Lambda}$ and $\lambda_1$ from moments of the inclusive rare FCNC decay $B \to X_s \gamma$. The first one is due to unknown matrix elements of higher dimensional operators which are estimated by varying the matrix elements in a range as suggested by dimensional analysis. The effect of these terms is found to be small. A second uncertainty arises from a cut on the photon energy and we give model independent bounds on these uncertainties as well as their estimates from a simplified version of the ACCMM model. |
hep-ph/0702284 | Koichi Matsuda | Takeshi Fukuyama, Koichi Matsuda, Hiroyuki Nishiura | Zero Texture Model and SO(10) GUT | 17 pages, 7 figures | Int.J.Mod.Phys.A22:5325-5343,2007 | 10.1142/S0217751X07037354 | null | hep-ph | null | We study the bridge between the phenomenological mass matrix model and SO(10)
GUT. Namely, we consider the four zero texture model in the framework of the
renormalizable SO(10) GUT model. This unification gives more stringent
constraints than the case where only either model is considered. However, we
can obtain good fitting by expanding the minimal SO(10) GUT to include 120 in
addition to 10 and \bar 126 in Yukawa coupling and by considering both type-I
and type-II seesaw mechanisms.
| [
{
"created": "Wed, 28 Feb 2007 01:27:18 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Fukuyama",
"Takeshi",
""
],
[
"Matsuda",
"Koichi",
""
],
[
"Nishiura",
"Hiroyuki",
""
]
] | We study the bridge between the phenomenological mass matrix model and SO(10) GUT. Namely, we consider the four zero texture model in the framework of the renormalizable SO(10) GUT model. This unification gives more stringent constraints than the case where only either model is considered. However, we can obtain good fitting by expanding the minimal SO(10) GUT to include 120 in addition to 10 and \bar 126 in Yukawa coupling and by considering both type-I and type-II seesaw mechanisms. |
1410.0124 | Christian Fischer | Christian S. Fischer, Jan Luecker, Christian A. Welzbacher | Locating the critical end point of QCD | Proceedings for Quark Matter 2014, Darmstadt (Germany), May 19-24,
2014 | null | 10.1016/j.nuclphysa.2014.09.033 | null | hep-ph hep-lat | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We summarize recent results for the phase structure of QCD at finite
temperature and light-quark chemical potential for N_f=2+1 and N_f=2+1+1
dynamical quark flavors. We discuss order parameters for the chiral and
deconfinement transitions obtained from solutions of a coupled set of
(truncated) Dyson-Schwinger equations for the quark and gluon propagators of
Landau gauge QCD. Based on excellent agreement with results from lattice-QCD at
zero chemical potential we study the possible appearance of a critical
end-point at large chemical potential.
| [
{
"created": "Wed, 1 Oct 2014 06:57:50 GMT",
"version": "v1"
}
] | 2014-10-02 | [
[
"Fischer",
"Christian S.",
""
],
[
"Luecker",
"Jan",
""
],
[
"Welzbacher",
"Christian A.",
""
]
] | We summarize recent results for the phase structure of QCD at finite temperature and light-quark chemical potential for N_f=2+1 and N_f=2+1+1 dynamical quark flavors. We discuss order parameters for the chiral and deconfinement transitions obtained from solutions of a coupled set of (truncated) Dyson-Schwinger equations for the quark and gluon propagators of Landau gauge QCD. Based on excellent agreement with results from lattice-QCD at zero chemical potential we study the possible appearance of a critical end-point at large chemical potential. |
hep-ph/0010064 | Allan Widom | Y.N. Srivastava, A. Widom | Hadronic Equipartition of Quark and Glue Momenta | four pages, RevTeX format, one figure *.eps | Phys.Rev. D63 (2001) 077502 | 10.1103/PhysRevD.63.077502 | null | hep-ph | null | If the ``glue'' which binds quarks within hadrons takes the form of strings,
then a virial theorem may be derived which shows how the total hadron four
momentum splits up into a quark contribution plus a glue contribution. The
hadrons made up of light quarks exhibit an equipartion of four momentum into
equal parts quarks and glue. The agreement with the experimental ``parton''
distribution four momentum sum rule is quite satisfactory as is the string
fragmentation model.
| [
{
"created": "Fri, 6 Oct 2000 21:27:38 GMT",
"version": "v1"
}
] | 2009-10-31 | [
[
"Srivastava",
"Y. N.",
""
],
[
"Widom",
"A.",
""
]
] | If the ``glue'' which binds quarks within hadrons takes the form of strings, then a virial theorem may be derived which shows how the total hadron four momentum splits up into a quark contribution plus a glue contribution. The hadrons made up of light quarks exhibit an equipartion of four momentum into equal parts quarks and glue. The agreement with the experimental ``parton'' distribution four momentum sum rule is quite satisfactory as is the string fragmentation model. |
1910.12839 | Pilar Coloma | Carlos Arg\"uelles, Pilar Coloma, Pilar Hern\'andez and V\'ictor
Mu\~noz | Searches for Atmospheric Long-Lived Particles | 33 pages, 19 figures. v2: Minor changes, references added. Version
accepted for publication in JHEP | null | 10.1007/JHEP02(2020)190 | null | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Long-lived particles are predicted in extensions of the Standard Model that
involve relatively light but very weakly interacting sectors. In this paper we
consider the possibility that some of these particles are produced in
atmospheric cosmic ray showers, and their decay intercepted by neutrino
detectors such as IceCube or Super-Kamiokande. We present the methodology and
evaluate the sensitivity of these searches in various scenarios, including
extensions with heavy neutral leptons in models of massive neutrinos, models
with an extra $U(1)$ gauge symmetry, and a combination of both in a
$U(1)_{B-L}$ model. Our results are shown as a function of the production rate
and the lifetime of the corresponding long-lived particles.
| [
{
"created": "Mon, 28 Oct 2019 17:49:46 GMT",
"version": "v1"
},
{
"created": "Thu, 13 Feb 2020 12:17:50 GMT",
"version": "v2"
}
] | 2020-03-18 | [
[
"Argüelles",
"Carlos",
""
],
[
"Coloma",
"Pilar",
""
],
[
"Hernández",
"Pilar",
""
],
[
"Muñoz",
"Víctor",
""
]
] | Long-lived particles are predicted in extensions of the Standard Model that involve relatively light but very weakly interacting sectors. In this paper we consider the possibility that some of these particles are produced in atmospheric cosmic ray showers, and their decay intercepted by neutrino detectors such as IceCube or Super-Kamiokande. We present the methodology and evaluate the sensitivity of these searches in various scenarios, including extensions with heavy neutral leptons in models of massive neutrinos, models with an extra $U(1)$ gauge symmetry, and a combination of both in a $U(1)_{B-L}$ model. Our results are shown as a function of the production rate and the lifetime of the corresponding long-lived particles. |
1507.08392 | Bowen Shi | Bowen Shi and Stuart Raby | Basis invariant description of chemical equilibrium with implications
for a recent axionic leptogenesis model | null | Phys. Rev. D 92, 085008 (2015) | 10.1103/PhysRevD.92.085008 | null | hep-ph astro-ph.CO hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We provide a systematic treatment of chemical equilibrium in the presence of
a specific type of time dependent background. The type of time dependent
background we consider appears, for example, in recently proposed axion/Majoron
leptogenesis models [1,2]. In describing the chemical equilibrium we use
quantities which are invariant under redefinition of fermion phases (we refer
to this redefinition as a change of basis for short), and therefore it is a
basis invariant treatment. The change of the anomaly terms due to the change of
the path integral measure [3,4] under a basis change is taken into account. We
find it is useful to go back and forth between different bases, and there are
insights which can be more easily obtained in one basis rather than another. A
toy model is provided to illustrate the ideas.
For the axion leptogenesis model [1], our result suggests that at $T >
10^{13}$ GeV , when sphaleron processes decouple, and $\Gamma_{B+L} << H <
\Gamma_L$ (where $H$ is the Hubble parameter at temperature $T$ and $\Gamma_L$
is the $\Delta L = 2$ lepton number violating interaction rate), the amount of
$B-L$ created is controlled by the smallness of the sphaleron interaction rate,
$\Gamma_{B+L}$. Therefore it is not as efficient as described. In addition, we
notice an interesting modification of gauge boson dispersion relations at
subleading order.
| [
{
"created": "Thu, 30 Jul 2015 06:24:59 GMT",
"version": "v1"
},
{
"created": "Tue, 29 Dec 2015 04:19:00 GMT",
"version": "v2"
}
] | 2015-12-31 | [
[
"Shi",
"Bowen",
""
],
[
"Raby",
"Stuart",
""
]
] | We provide a systematic treatment of chemical equilibrium in the presence of a specific type of time dependent background. The type of time dependent background we consider appears, for example, in recently proposed axion/Majoron leptogenesis models [1,2]. In describing the chemical equilibrium we use quantities which are invariant under redefinition of fermion phases (we refer to this redefinition as a change of basis for short), and therefore it is a basis invariant treatment. The change of the anomaly terms due to the change of the path integral measure [3,4] under a basis change is taken into account. We find it is useful to go back and forth between different bases, and there are insights which can be more easily obtained in one basis rather than another. A toy model is provided to illustrate the ideas. For the axion leptogenesis model [1], our result suggests that at $T > 10^{13}$ GeV , when sphaleron processes decouple, and $\Gamma_{B+L} << H < \Gamma_L$ (where $H$ is the Hubble parameter at temperature $T$ and $\Gamma_L$ is the $\Delta L = 2$ lepton number violating interaction rate), the amount of $B-L$ created is controlled by the smallness of the sphaleron interaction rate, $\Gamma_{B+L}$. Therefore it is not as efficient as described. In addition, we notice an interesting modification of gauge boson dispersion relations at subleading order. |
1706.01490 | Hao Sun | YuFei Zhang, Hao Sun, Xuan Luo and WeiNing Zhang | Searching for the heavy custodial fiveplet Higgs in the Georgi-Machacek
model at the International Linear Collider | 9 figures, 26 pages, submit to PRD | Phys.Rev. D95 (2017) no.11, 115022 | 10.1103/PhysRevD.95.115022 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The Georgi-Machacek (GM) model is one of many Beyond Standard Model scenarios
with an extended scalar sector which can group under the custodial $\rm
SU(2)_C$ symmetry into a fiveplet, a triplet, and two singlets. The heavy
charged custodial fiveplet Higgs $\rm H_5^{\pm}$ are typical particles in GM
model which couple to the electroweak gauge bosons, therefore provide a good
testing ground for the detection of the $\rm H^\pm W^\mp Z$ vertex. The neutral
custodial fiveplet Higgs $\rm H_5^{0}$ in the GM model has the same mass with
$\rm H_5^{\pm}$ and couples to the electroweak gauge bosons $\rm W^+ W^-$ and
ZZ both. We study the discovery prospects of the exotic scalar bosons $\rm
H_5^{\pm}$ and $\rm H_5^{0}$ at the International Linear Collider(ILC) via the
vector boson associated production processes, and discuss two different decay
modes for both charged and neutral scalars. The discovery potential is
discussed. Testing the mass degeneracy of charged and neutral scalar bosons in
the GM model is also considered.
| [
{
"created": "Mon, 5 Jun 2017 18:38:53 GMT",
"version": "v1"
}
] | 2017-06-27 | [
[
"Zhang",
"YuFei",
""
],
[
"Sun",
"Hao",
""
],
[
"Luo",
"Xuan",
""
],
[
"Zhang",
"WeiNing",
""
]
] | The Georgi-Machacek (GM) model is one of many Beyond Standard Model scenarios with an extended scalar sector which can group under the custodial $\rm SU(2)_C$ symmetry into a fiveplet, a triplet, and two singlets. The heavy charged custodial fiveplet Higgs $\rm H_5^{\pm}$ are typical particles in GM model which couple to the electroweak gauge bosons, therefore provide a good testing ground for the detection of the $\rm H^\pm W^\mp Z$ vertex. The neutral custodial fiveplet Higgs $\rm H_5^{0}$ in the GM model has the same mass with $\rm H_5^{\pm}$ and couples to the electroweak gauge bosons $\rm W^+ W^-$ and ZZ both. We study the discovery prospects of the exotic scalar bosons $\rm H_5^{\pm}$ and $\rm H_5^{0}$ at the International Linear Collider(ILC) via the vector boson associated production processes, and discuss two different decay modes for both charged and neutral scalars. The discovery potential is discussed. Testing the mass degeneracy of charged and neutral scalar bosons in the GM model is also considered. |
1110.4438 | Thomas Schutzmeier | Laura Reina, Thomas Schutzmeier | Towards W b bbar + j at NLO with an automatized approach to one-loop
computations | 14 pages, 3 figures | null | 10.1007/JHEP09(2012)119 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present results for the O(alpha_s) virtual corrections to q g -> W b bbar
q' obtained with a new automatized approach to the evaluation of one-loop
amplitudes in terms of Feynman diagrams. Together with the O(alpha_s)
corrections to q q' -> W b bbar g, which can be obtained from our results by
crossing symmetry, this represents the bulk of the next-to-leading order
virtual QCD corrections to W b bbar + j and W b + j hadronic production,
calculated in a fixed-flavor scheme with four light flavors. Furthermore, these
corrections represent a well defined and independent subset of the 1-loop
amplitudes needed for the NNLO calculation of W b bbar. Our approach was tested
against several existing results for NLO amplitudes including selected
O(alpha_s) one-loop corrections to W + 3 j hadronic production. We discuss the
efficiency of our method both with respect to evaluation time and numerical
stability.
| [
{
"created": "Thu, 20 Oct 2011 04:13:17 GMT",
"version": "v1"
},
{
"created": "Wed, 29 Feb 2012 01:41:17 GMT",
"version": "v2"
}
] | 2015-05-30 | [
[
"Reina",
"Laura",
""
],
[
"Schutzmeier",
"Thomas",
""
]
] | We present results for the O(alpha_s) virtual corrections to q g -> W b bbar q' obtained with a new automatized approach to the evaluation of one-loop amplitudes in terms of Feynman diagrams. Together with the O(alpha_s) corrections to q q' -> W b bbar g, which can be obtained from our results by crossing symmetry, this represents the bulk of the next-to-leading order virtual QCD corrections to W b bbar + j and W b + j hadronic production, calculated in a fixed-flavor scheme with four light flavors. Furthermore, these corrections represent a well defined and independent subset of the 1-loop amplitudes needed for the NNLO calculation of W b bbar. Our approach was tested against several existing results for NLO amplitudes including selected O(alpha_s) one-loop corrections to W + 3 j hadronic production. We discuss the efficiency of our method both with respect to evaluation time and numerical stability. |
hep-ph/0305068 | Takuya Mizoguchi | M. Biyajima, T. Mizoguchi and N. Suzuki | A formulation for description of pi^+(2pi^-) and pi^-(2pi^+) channels in
Bose-Einstein correlation by Coulomb wave function | 10 pages, 7 figures | Phys.Lett. B568 (2003) 237-244 | 10.1016/j.physletb.2003.06.063 | null | hep-ph | null | In order to analyze data on charged pions correlation channels, pi^+(2pi^-)
and pi^-(2pi^+), we propose new interferometry approach using the Coulomb wave
function. We show that to describe adequately data we have to introduce new
parameter describing the contribution of pi^-(k_1) pi^+(k_2) --> pi^-(k_2)
pi^+(k_1) process. Using this new formula we analyze data on pi^+(2pi^-) and
pi^-(2pi^+) channels at sqrt(s) = 91 GeV by DELPHI Collaboration, and estimate
the magnitude of this new parameter as well as the degree of coherence.
| [
{
"created": "Wed, 7 May 2003 10:50:48 GMT",
"version": "v1"
},
{
"created": "Fri, 30 May 2003 14:54:00 GMT",
"version": "v2"
}
] | 2009-11-10 | [
[
"Biyajima",
"M.",
""
],
[
"Mizoguchi",
"T.",
""
],
[
"Suzuki",
"N.",
""
]
] | In order to analyze data on charged pions correlation channels, pi^+(2pi^-) and pi^-(2pi^+), we propose new interferometry approach using the Coulomb wave function. We show that to describe adequately data we have to introduce new parameter describing the contribution of pi^-(k_1) pi^+(k_2) --> pi^-(k_2) pi^+(k_1) process. Using this new formula we analyze data on pi^+(2pi^-) and pi^-(2pi^+) channels at sqrt(s) = 91 GeV by DELPHI Collaboration, and estimate the magnitude of this new parameter as well as the degree of coherence. |
2312.00806 | Manuel Szewc | Manuel Szewc | Accessing CKM suppressed top decays at the LHC | Talk at the 16th International Workshop on Top Quark Physics
(Top2023), 24-29 September 2023 | null | null | null | hep-ph hep-ex | http://creativecommons.org/licenses/by/4.0/ | We present an strategy for measuring the off-diagonal elements of the third
row of CKM matrix $|V_{tq}|$ through the branching fractions of top quark
decays $t\to q W$, where $q$ is a light quark jet. This strategy is an
extension of existing measurements, with the improvement rooted in the use of
orthogonal $b$- and $q$-taggers that add a new observable, the number of
light-quark-tagged jets, to the already commonly used observable, the fraction
of $b$-tagged jets in an event. Careful inclusion of the additional
complementary observable significantly increases the expected statistical power
of the analysis, with the possibility of excluding a null
$|V_{td}|^2+|V_{ts}|^2$ at $95\%$ C.L. at the HL-LHC.
| [
{
"created": "Fri, 24 Nov 2023 22:23:41 GMT",
"version": "v1"
}
] | 2023-12-05 | [
[
"Szewc",
"Manuel",
""
]
] | We present an strategy for measuring the off-diagonal elements of the third row of CKM matrix $|V_{tq}|$ through the branching fractions of top quark decays $t\to q W$, where $q$ is a light quark jet. This strategy is an extension of existing measurements, with the improvement rooted in the use of orthogonal $b$- and $q$-taggers that add a new observable, the number of light-quark-tagged jets, to the already commonly used observable, the fraction of $b$-tagged jets in an event. Careful inclusion of the additional complementary observable significantly increases the expected statistical power of the analysis, with the possibility of excluding a null $|V_{td}|^2+|V_{ts}|^2$ at $95\%$ C.L. at the HL-LHC. |
1411.2485 | Timothy Burns | T. J. Burns | Meson mass splittings in unquenched quark models (EEF70) | Presented at the Workshop on Unquenched Hadron Spectroscopy:
Non-Perturbative Models and Methods of QCD vs. Experiment (EEF70) | null | null | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | General results are obtained for meson mass splittings and mixings in
unquenched (coupled-channel) quark models. Theorems derived previously in
perturbation theory are generalised to the full coupled-channel system. A new
formula is obtained for the mass splittings of physical states in terms of the
splittings of the valence states. The S-wave hyperfine splitting decreases due
to unquenching, but its relation to the vector $e^+e^-$ width is unchanged;
this yields a prediction for the missing $\eta_b(3S)$. The ordinary (quenched)
quark model result that the P-wave hyperfine splitting vanishes also survives
unquenching. A ratio of mass splittings used to discriminate quarkonium
potential models is scarcely affected by unquenching.
| [
{
"created": "Mon, 10 Nov 2014 16:19:13 GMT",
"version": "v1"
}
] | 2014-11-11 | [
[
"Burns",
"T. J.",
""
]
] | General results are obtained for meson mass splittings and mixings in unquenched (coupled-channel) quark models. Theorems derived previously in perturbation theory are generalised to the full coupled-channel system. A new formula is obtained for the mass splittings of physical states in terms of the splittings of the valence states. The S-wave hyperfine splitting decreases due to unquenching, but its relation to the vector $e^+e^-$ width is unchanged; this yields a prediction for the missing $\eta_b(3S)$. The ordinary (quenched) quark model result that the P-wave hyperfine splitting vanishes also survives unquenching. A ratio of mass splittings used to discriminate quarkonium potential models is scarcely affected by unquenching. |
hep-ph/0209194 | Abner Soffer | Roy Aleksan, Troels Petersen, Abner Soffer | Measuring the Weak Phase gamma in Color Allowed B->DKpi Decays | 18 pages, LaTex, 15 eps and ps figures | Phys.Rev.D67:096002,2003 | 10.1103/PhysRevD.67.096002 | CSUHEP 02-01, DAPNIA-02-95, LAL-02-83 | hep-ph | null | We present a method to measure the weak phase gamma in the three-body decay
of charged B mesons to the final states D K pi0. These decays are mediated by
interfering amplitudes which are color-allowed and hence relatively large. As a
result, large CP violation effects that could be observed with high statistical
significance are possible. In addition, the three-body decay helps resolve
discrete ambiguities that are usually present in measurements of the weak
phase. The experimental implications of conducting these measurements with
three-body decays are discussed, and the sensitivity of the method is evaluated
using a simulation.
| [
{
"created": "Tue, 17 Sep 2002 17:44:36 GMT",
"version": "v1"
},
{
"created": "Fri, 15 Nov 2002 07:47:29 GMT",
"version": "v2"
}
] | 2010-11-23 | [
[
"Aleksan",
"Roy",
""
],
[
"Petersen",
"Troels",
""
],
[
"Soffer",
"Abner",
""
]
] | We present a method to measure the weak phase gamma in the three-body decay of charged B mesons to the final states D K pi0. These decays are mediated by interfering amplitudes which are color-allowed and hence relatively large. As a result, large CP violation effects that could be observed with high statistical significance are possible. In addition, the three-body decay helps resolve discrete ambiguities that are usually present in measurements of the weak phase. The experimental implications of conducting these measurements with three-body decays are discussed, and the sensitivity of the method is evaluated using a simulation. |
1604.08167 | Peter Denton | Peter B. Denton, Hisakazu Minakata, Stephen J. Parke | Compact Perturbative Expressions For Neutrino Oscillations in Matter | 24 pages, 3 figures | JHEP 06 (2016) 051 | 10.1007/JHEP06(2016)051 | FERMILAB-PUB-16-126-T; Yachay-PUB-16-01-PN | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We further develop and extend a recent perturbative framework for neutrino
oscillations in uniform matter density so that the resulting oscillation
probabilities are accurate for the complete matter potential versus baseline
divided by neutrino energy plane. This extension also gives the exact
oscillation probabilities in vacuum for all values of baseline divided by
neutrino energy. The expansion parameter used is related to the ratio of the
solar to the atmospheric $\Delta m^2$ scales but with a unique choice of the
atmospheric $\Delta m^2$ such that certain first-order effects are taken into
account in the zeroth-order Hamiltonian. Using a mixing matrix formulation,
this framework has the exceptional feature that the neutrino oscillation
probability in matter has the same structure as in vacuum, to all orders in the
expansion parameter. It also contains all orders in the matter potential and
$\sin\theta_{13}$. It facilitates immediate physical interpretation of the
analytic results, and makes the expressions for the neutrino oscillation
probabilities extremely compact and very accurate even at zeroth order in our
perturbative expansion. The first and second order results are also given which
improve the precision by approximately two or more orders of magnitude per
perturbative order.
| [
{
"created": "Wed, 27 Apr 2016 18:28:30 GMT",
"version": "v1"
}
] | 2018-05-30 | [
[
"Denton",
"Peter B.",
""
],
[
"Minakata",
"Hisakazu",
""
],
[
"Parke",
"Stephen J.",
""
]
] | We further develop and extend a recent perturbative framework for neutrino oscillations in uniform matter density so that the resulting oscillation probabilities are accurate for the complete matter potential versus baseline divided by neutrino energy plane. This extension also gives the exact oscillation probabilities in vacuum for all values of baseline divided by neutrino energy. The expansion parameter used is related to the ratio of the solar to the atmospheric $\Delta m^2$ scales but with a unique choice of the atmospheric $\Delta m^2$ such that certain first-order effects are taken into account in the zeroth-order Hamiltonian. Using a mixing matrix formulation, this framework has the exceptional feature that the neutrino oscillation probability in matter has the same structure as in vacuum, to all orders in the expansion parameter. It also contains all orders in the matter potential and $\sin\theta_{13}$. It facilitates immediate physical interpretation of the analytic results, and makes the expressions for the neutrino oscillation probabilities extremely compact and very accurate even at zeroth order in our perturbative expansion. The first and second order results are also given which improve the precision by approximately two or more orders of magnitude per perturbative order. |
1107.3149 | Michael Rauch | G. Bozzi, F. Campanario, M. Rauch, D. Zeppenfeld | Z\gamma\gamma production with leptonic decays and triple photon
production at NLO QCD | 14 pages, 10 figures, 2 tables | null | 10.1103/PhysRevD.84.074028 | FTUV-11-0715, IFUM-972-FT, KA-TP-16-2011, LPN11-38, SFB/CPP-11-39 | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present a calculation of the O(alpha_s) QCD corrections to the production
of a Z boson in association with two photons and to triple photon production at
hadron colliders. All final-state photons are taken as real. For the Z boson,
we consider the decays both into charged leptons and into neutrinos including
all off-shell effects. Numerical results are obtained via a Monte Carlo program
based on the structure of the VBFNLO program package. This allows us to
implement general cuts and distributions of the final-state particles. We find
that the NLO QCD corrections are sizable and significantly exceed the
expectations from a scale variation of the leading-order result. In addition,
differential distributions of important observables change considerably. The
prediction of two-photon-associated Z production with Z decays into neutrinos
from the charged-lepton rate works well, once we use an additional cut on the
invariant mass of the charged-lepton pair.
| [
{
"created": "Fri, 15 Jul 2011 20:00:03 GMT",
"version": "v1"
}
] | 2013-05-29 | [
[
"Bozzi",
"G.",
""
],
[
"Campanario",
"F.",
""
],
[
"Rauch",
"M.",
""
],
[
"Zeppenfeld",
"D.",
""
]
] | We present a calculation of the O(alpha_s) QCD corrections to the production of a Z boson in association with two photons and to triple photon production at hadron colliders. All final-state photons are taken as real. For the Z boson, we consider the decays both into charged leptons and into neutrinos including all off-shell effects. Numerical results are obtained via a Monte Carlo program based on the structure of the VBFNLO program package. This allows us to implement general cuts and distributions of the final-state particles. We find that the NLO QCD corrections are sizable and significantly exceed the expectations from a scale variation of the leading-order result. In addition, differential distributions of important observables change considerably. The prediction of two-photon-associated Z production with Z decays into neutrinos from the charged-lepton rate works well, once we use an additional cut on the invariant mass of the charged-lepton pair. |
2208.08197 | Oleh Fedkevych | Oleh Fedkevych, Jonathan R. Gaunt | On sum rules for double and triple parton distribution functions and
Pythia's model of multiple parton interactions | 56 pages, 15 figures | null | 10.1007/JHEP02(2023)090 | LU-TP-20-17, MCNET-22-15 | hep-ph | http://creativecommons.org/licenses/by/4.0/ | Multi-parton distributions in a proton, the nonperturbative quantities needed
to make predictions for multiple scattering rates, are poorly constrained from
theory and data and must be modelled. All Monte Carlo event generators that
simulate multiple parton interactions (e.g. Pythia) contain such a model of
multi-parton PDFs. One important theoretical constraint for the case of double
parton distributions is provided by the so-called number and momentum sum
rules. In this paper we investigate to what extent the double parton
distribution functions used in the Pythia event generator obey these sum rules.
We also derive the number and momentum sum rules for the triple parton
distribution functions and discuss how one can use the Pythia code to construct
triple parton distribution functions which approximately satisfy these sum
rules.
| [
{
"created": "Wed, 17 Aug 2022 10:05:00 GMT",
"version": "v1"
},
{
"created": "Fri, 17 Feb 2023 16:13:05 GMT",
"version": "v2"
}
] | 2023-03-01 | [
[
"Fedkevych",
"Oleh",
""
],
[
"Gaunt",
"Jonathan R.",
""
]
] | Multi-parton distributions in a proton, the nonperturbative quantities needed to make predictions for multiple scattering rates, are poorly constrained from theory and data and must be modelled. All Monte Carlo event generators that simulate multiple parton interactions (e.g. Pythia) contain such a model of multi-parton PDFs. One important theoretical constraint for the case of double parton distributions is provided by the so-called number and momentum sum rules. In this paper we investigate to what extent the double parton distribution functions used in the Pythia event generator obey these sum rules. We also derive the number and momentum sum rules for the triple parton distribution functions and discuss how one can use the Pythia code to construct triple parton distribution functions which approximately satisfy these sum rules. |
2302.05467 | Jeonghyeon Song | Jinheung Kim, Soojin Lee, Prasenjit Sanyal, Jeonghyeon Song, and
Daohan Wang | $\tau^\pm \nu \gamma\gamma$ and $\ell^\pm \ell^\pm \gamma \gamma
{\rlap{\,/}{E}_T} X$ to probe the fermiophobic Higgs boson with high cutoff
scales | Final version to appear in JHEP | null | null | null | hep-ph hep-ex | http://creativecommons.org/licenses/by/4.0/ | The light fermiophobic Higgs boson $h_{\rm f}$ in the type-I
two-Higgs-doublet model can evade the current search programs at the LHC since
its production through the quark-antiquark annihilation and gluon fusion is not
feasible. The particle can be more elusive if the model retains stability up to
the Planck scale because the efficient discovery channels are missing from the
existing search chart. Through the comprehensive scanning, we show that all the
viable parameter points with the Planck cutoff scale require $ m_{h_{\rm f}}
\in[80,\, 120]{\;{\rm GeV}}$ and $M_{A/H^\pm} \in [90,\,150]{\;{\rm GeV}}$.
Since $h_{\rm f}h_{\rm f}\to \gamma\gamma W^+ W^-$ and $H^\pm \to \tau^\pm
\nu/h_{\rm f}W^\pm$ are dominant in this case, two final states are more
efficient to probe $h_{\rm f}$ than the conventional search mode of
$4\gamma+W^\pm/Z$. One is $\tau^\pm\nu \gamma\gamma$ from $pp \to
H^\pm(\to\tau^\pm\nu) h_{\rm f}(\to \gamma\gamma)$ and the other is $\ell^\pm
\ell^\pm \gamma\gamma {\rlap{\,/}{E}_T} X$ ($\ell^\pm=e^\pm,\mu^\pm$) from $pp
\to H^\pm(\to h_{\rm f}W^\pm) h_{\rm f} \to \gamma\gamma W^+ W^-W^\pm $, $pp
\to H^\pm(\to h_{\rm f} W^\pm) A(\to h_{\rm f} Z) \to \gamma\gamma W^+ W^-
W^\pm Z $, and $pp \to H^+(\to h_{\rm f} W^+)H^-(\to h_{\rm f} W^-)\to
\gamma\gamma W^+ W^- W^+ W^-$. The inclusive $\ell^\pm \ell^\pm \gamma\gamma
{\rlap{\,/}{E}_T} X$ consists of a same-sign dilepton, two prompt photons, and
missing transverse energy. We perform the signal-background analysis at the
detector level. With the total integrated luminosity of $300\;{\rm fb}^{-1}$
and the 5\% background uncertainty, two proposed channels at the 14 TeV LHC
yield signal significances above five in the entire viable parameter space of
the fermiophobic type-I with a high cutoff scale.
| [
{
"created": "Fri, 10 Feb 2023 19:00:09 GMT",
"version": "v1"
},
{
"created": "Mon, 10 Apr 2023 04:41:07 GMT",
"version": "v2"
}
] | 2023-04-11 | [
[
"Kim",
"Jinheung",
""
],
[
"Lee",
"Soojin",
""
],
[
"Sanyal",
"Prasenjit",
""
],
[
"Song",
"Jeonghyeon",
""
],
[
"Wang",
"Daohan",
""
]
] | The light fermiophobic Higgs boson $h_{\rm f}$ in the type-I two-Higgs-doublet model can evade the current search programs at the LHC since its production through the quark-antiquark annihilation and gluon fusion is not feasible. The particle can be more elusive if the model retains stability up to the Planck scale because the efficient discovery channels are missing from the existing search chart. Through the comprehensive scanning, we show that all the viable parameter points with the Planck cutoff scale require $ m_{h_{\rm f}} \in[80,\, 120]{\;{\rm GeV}}$ and $M_{A/H^\pm} \in [90,\,150]{\;{\rm GeV}}$. Since $h_{\rm f}h_{\rm f}\to \gamma\gamma W^+ W^-$ and $H^\pm \to \tau^\pm \nu/h_{\rm f}W^\pm$ are dominant in this case, two final states are more efficient to probe $h_{\rm f}$ than the conventional search mode of $4\gamma+W^\pm/Z$. One is $\tau^\pm\nu \gamma\gamma$ from $pp \to H^\pm(\to\tau^\pm\nu) h_{\rm f}(\to \gamma\gamma)$ and the other is $\ell^\pm \ell^\pm \gamma\gamma {\rlap{\,/}{E}_T} X$ ($\ell^\pm=e^\pm,\mu^\pm$) from $pp \to H^\pm(\to h_{\rm f}W^\pm) h_{\rm f} \to \gamma\gamma W^+ W^-W^\pm $, $pp \to H^\pm(\to h_{\rm f} W^\pm) A(\to h_{\rm f} Z) \to \gamma\gamma W^+ W^- W^\pm Z $, and $pp \to H^+(\to h_{\rm f} W^+)H^-(\to h_{\rm f} W^-)\to \gamma\gamma W^+ W^- W^+ W^-$. The inclusive $\ell^\pm \ell^\pm \gamma\gamma {\rlap{\,/}{E}_T} X$ consists of a same-sign dilepton, two prompt photons, and missing transverse energy. We perform the signal-background analysis at the detector level. With the total integrated luminosity of $300\;{\rm fb}^{-1}$ and the 5\% background uncertainty, two proposed channels at the 14 TeV LHC yield signal significances above five in the entire viable parameter space of the fermiophobic type-I with a high cutoff scale. |
1610.01305 | Sergey Mikhailov | S. V. Mikhailov | On a realization of $\{\beta\}$-expansion in QCD | 14 pages, Introduction, Sec.2, Conclusion are significantly improved | null | 10.1007/JHEP04(2017)169 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We suggest a simple algebraic approach to fix the elements of the $\{ \beta
\}$-expansion for renormalization group invariant quantities, which uses
additional degrees of freedom. The approach is discussed in detail for N$^2$LO
calculations in QCD with the MSSM gluino -- an additional degree of freedom. We
derive the formulae of the $\{ \beta \}$-expansion for the nonsinglet Adler
$D$-function and Bjorken polarized sum rules in the actual N$^3$LO within this
quantum field theory scheme with the MSSM gluino and the scheme with the second
additional degree of freedom. We discuss the properties of the $\{ \beta
\}$-expansion for higher orders considering the N$^4$LO as an example.
| [
{
"created": "Wed, 5 Oct 2016 08:19:44 GMT",
"version": "v1"
},
{
"created": "Fri, 11 Nov 2016 17:11:02 GMT",
"version": "v2"
},
{
"created": "Mon, 5 Dec 2016 14:59:47 GMT",
"version": "v3"
},
{
"created": "Thu, 22 Dec 2016 21:36:00 GMT",
"version": "v4"
},
{
"created": "Thu, 16 Mar 2017 21:49:23 GMT",
"version": "v5"
}
] | 2017-05-24 | [
[
"Mikhailov",
"S. V.",
""
]
] | We suggest a simple algebraic approach to fix the elements of the $\{ \beta \}$-expansion for renormalization group invariant quantities, which uses additional degrees of freedom. The approach is discussed in detail for N$^2$LO calculations in QCD with the MSSM gluino -- an additional degree of freedom. We derive the formulae of the $\{ \beta \}$-expansion for the nonsinglet Adler $D$-function and Bjorken polarized sum rules in the actual N$^3$LO within this quantum field theory scheme with the MSSM gluino and the scheme with the second additional degree of freedom. We discuss the properties of the $\{ \beta \}$-expansion for higher orders considering the N$^4$LO as an example. |
1903.06803 | Aurore Courtoy | A. Courtoy | Pion induced Drell-Yan: the transverse momentum structure of the pion | Proceedings of the XLII Symposium on Nuclear Physics, Cocoyoc,
Mexico, January 7-10, 2019. To be published in Journal of Physics Conference
Series | null | 10.1088/1742-6596/1308/1/012008 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present an analysis of unpolarized Drell-Yan pair production in
pion-nucleus scattering with a particular focus into the pion dynamics. The
study consists in analyzing the effect of the partonic longitudinal and,
especially, transverse distributions of the pion in a Nambu--Jona-Lasinio (NJL)
framework, with Pauli-Villars regularization. In order to consistently take
into account the QCD evolution effects, we have estimated the hadronic scale
corresponding to the NJL model's degrees of freedom through a minimization
procedure at NLO: The NLO evolved pion distributions have been compared to
rapidity differential Drell-Yan cross sections data. That hadronic scale so
determined represents the only free parameter in our approach. The NJL
transverse momentum PDF, evolved up to next-to-leading logarithmic accuracy, is
then tested against the transverse momentum spectrum of dilepton pairs up to a
transverse momentum of 2 GeV. We found a fair agreement with available
pion-nucleus data. We find sizable evolution effects on the shape of the
distributions and on the generated average transverse momentum of the dilepton
pair.
| [
{
"created": "Fri, 15 Mar 2019 21:01:43 GMT",
"version": "v1"
}
] | 2020-01-08 | [
[
"Courtoy",
"A.",
""
]
] | We present an analysis of unpolarized Drell-Yan pair production in pion-nucleus scattering with a particular focus into the pion dynamics. The study consists in analyzing the effect of the partonic longitudinal and, especially, transverse distributions of the pion in a Nambu--Jona-Lasinio (NJL) framework, with Pauli-Villars regularization. In order to consistently take into account the QCD evolution effects, we have estimated the hadronic scale corresponding to the NJL model's degrees of freedom through a minimization procedure at NLO: The NLO evolved pion distributions have been compared to rapidity differential Drell-Yan cross sections data. That hadronic scale so determined represents the only free parameter in our approach. The NJL transverse momentum PDF, evolved up to next-to-leading logarithmic accuracy, is then tested against the transverse momentum spectrum of dilepton pairs up to a transverse momentum of 2 GeV. We found a fair agreement with available pion-nucleus data. We find sizable evolution effects on the shape of the distributions and on the generated average transverse momentum of the dilepton pair. |
2001.08991 | Jayanta Dey | Jayanta Dey, Sabyasachi Ghosh, Chowdhury Aminul Islam | Causal aspects of effective QCD models | Conference proceeding in 64th DAE-BRNS Symposium on Nuclear Physics,
Link- http://sympnp.org/snp2019/ | null | null | null | hep-ph nucl-th | http://creativecommons.org/licenses/by/4.0/ | Here we studied the possible diffusion speed for relativistic fluid in
different effective quantum chromodynamics models: Nambu-Jona-Lasinio (NJL),
Polyakov loop extended NJL, entangled PNJL (EPNJL) model.
| [
{
"created": "Tue, 14 Jan 2020 10:08:19 GMT",
"version": "v1"
},
{
"created": "Mon, 22 Feb 2021 11:31:23 GMT",
"version": "v2"
}
] | 2021-02-23 | [
[
"Dey",
"Jayanta",
""
],
[
"Ghosh",
"Sabyasachi",
""
],
[
"Islam",
"Chowdhury Aminul",
""
]
] | Here we studied the possible diffusion speed for relativistic fluid in different effective quantum chromodynamics models: Nambu-Jona-Lasinio (NJL), Polyakov loop extended NJL, entangled PNJL (EPNJL) model. |
1908.02695 | Alexander Ochirov Dr. | Alexander Ochirov and Ben Page | Multi-Quark Colour Decompositions from Unitarity | 29 pages + appendices + references; v2 minor text improvements,
journal version (with author-typeset eqns) | JHEP 1910 (2019) 058 | 10.1007/JHEP10(2019)058 | IPhT-19/090 | hep-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Any loop QCD amplitude at full colour is constructed from kinematic and
gauge-group building blocks. In a unitarity-based on-shell framework, both
objects can be reconstructed from their respective counterparts in tree-level
amplitudes. This procedure is at its most powerful when aligned with flexible
colour decompositions of tree-level QCD amplitudes. In this note we derive such
decompositions for amplitudes with an arbitrary number of quarks and gluons
from the same principle that is used to bootstrap kinematics - unitarity
factorisation. In the process we formulate new multi-quark bases and provide
closed-form expressions for the new decompositions. We then elaborate upon
their application in colour decompositions of loop multi-quark amplitudes.
| [
{
"created": "Wed, 7 Aug 2019 16:01:51 GMT",
"version": "v1"
},
{
"created": "Fri, 27 Sep 2019 14:46:17 GMT",
"version": "v2"
}
] | 2019-10-15 | [
[
"Ochirov",
"Alexander",
""
],
[
"Page",
"Ben",
""
]
] | Any loop QCD amplitude at full colour is constructed from kinematic and gauge-group building blocks. In a unitarity-based on-shell framework, both objects can be reconstructed from their respective counterparts in tree-level amplitudes. This procedure is at its most powerful when aligned with flexible colour decompositions of tree-level QCD amplitudes. In this note we derive such decompositions for amplitudes with an arbitrary number of quarks and gluons from the same principle that is used to bootstrap kinematics - unitarity factorisation. In the process we formulate new multi-quark bases and provide closed-form expressions for the new decompositions. We then elaborate upon their application in colour decompositions of loop multi-quark amplitudes. |
1705.00402 | Masaki J.S. Yang | Masaki J. S. Yang | A possibility on prohibition of Higgs mass by the extended Lorentz
transformation in noncommutative geometry | 8 pages, substantially modified from the previous version | null | null | STUPP-17-230 | hep-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this letter, we propose the extended Lorentz transformation in
noncommutative geometry, as a possibility on prohibition of the Higgs mass.
Since it is difficult to build the symmetry between the connections $A_{\mu}$
and $H$, the transformation is defined for the differential two-forms. The
parameter of the transformation $\omega$ changes a two-form into other
two-forms. Comparing the coefficients of the two-forms, the transformations are
translated to those of the product fields $F_{\mu\nu}, D_{\mu} H$ and
$HH^{\dagger}$. It shows the invariance of the bosonic Lagrangian explicitly.
| [
{
"created": "Mon, 1 May 2017 02:23:54 GMT",
"version": "v1"
},
{
"created": "Mon, 26 Jun 2017 01:39:10 GMT",
"version": "v2"
},
{
"created": "Wed, 23 Aug 2017 09:35:07 GMT",
"version": "v3"
}
] | 2017-08-24 | [
[
"Yang",
"Masaki J. S.",
""
]
] | In this letter, we propose the extended Lorentz transformation in noncommutative geometry, as a possibility on prohibition of the Higgs mass. Since it is difficult to build the symmetry between the connections $A_{\mu}$ and $H$, the transformation is defined for the differential two-forms. The parameter of the transformation $\omega$ changes a two-form into other two-forms. Comparing the coefficients of the two-forms, the transformations are translated to those of the product fields $F_{\mu\nu}, D_{\mu} H$ and $HH^{\dagger}$. It shows the invariance of the bosonic Lagrangian explicitly. |
hep-ph/0305110 | Antonio O. Bouzas | Antonio O. Bouzas | Mixing Renormalization for Scalar Fields | 32 pages, LaTeX2e, AmsLaTeX, minor typos corrected | Int.J.Mod.Phys. A18 (2003) 3695-3734; Int.J.Mod.Phys. A21 (2006)
1157 | 10.1142/S0217751X03015775 | null | hep-ph | null | We consider the renormalization of theories with many scalar fields. We
discuss at the one-loop level some simple, non-gauge models with an arbitrary
number of scalars and fermions both in mass-shell and MS schemes. In MS scheme
we give a detailed qualitative analysis of the RG flow of dimensionless
couplings in flavor space.
| [
{
"created": "Sat, 10 May 2003 00:50:01 GMT",
"version": "v1"
},
{
"created": "Mon, 4 Aug 2003 21:15:10 GMT",
"version": "v2"
}
] | 2009-11-10 | [
[
"Bouzas",
"Antonio O.",
""
]
] | We consider the renormalization of theories with many scalar fields. We discuss at the one-loop level some simple, non-gauge models with an arbitrary number of scalars and fermions both in mass-shell and MS schemes. In MS scheme we give a detailed qualitative analysis of the RG flow of dimensionless couplings in flavor space. |
hep-ph/0403112 | R. Sekhar Chivukula | R. Sekhar Chivukula, Masafumi Kurachi, and Masaharu Tanabashi | Generalized Weinberg Sum Rules in Deconstructed QCD | 12 pages, 5 eps figures; reference to overlapping work added | JHEP 0406:004,2004 | 10.1088/1126-6708/2004/06/004 | MSUHEP-040308, DPNU-04-05, TU-712 | hep-ph | null | Recently, Son and Stephanov have considered an "open moose" as a possible
dual model of a QCD-like theory of chiral symmetry breaking. In this note we
demonstrate that although the Weinberg sum rules are satisfied in any such
model, the relevant sums converge very slowly and in a manner unlike QCD.
Further, we show that such a model satisfies a set of generalized sum rules.
These sum rules can be understood by looking at the operator product expansion
for the correlation function of chiral currents, and correspond to the absence
of low-dimension gauge-invariant chiral symmetry breaking condensates. These
results imply that, regardless of the couplings and F-constants chosen, the
open moose is not the dual of any QCD-like theory of chiral symmetry breaking.
We also show that the generalized sum rules can be "solved", leading to a
compact expression for the difference of vector- and axial-current correlation
functions. This expression allows for a simple formula for the S parameter
(L_10), which implies that S is always positive and of order one in any
(unitary) open linear moose model. Therefore the S parameter is positive and
order one in any "Higgsless model" based on the continuum limit of a linear
moose regardless of the warping or position-dependent gauge-coupling chosen.
| [
{
"created": "Wed, 10 Mar 2004 14:22:55 GMT",
"version": "v1"
},
{
"created": "Tue, 16 Mar 2004 14:13:37 GMT",
"version": "v2"
},
{
"created": "Tue, 23 Mar 2004 13:47:05 GMT",
"version": "v3"
}
] | 2010-02-03 | [
[
"Chivukula",
"R. Sekhar",
""
],
[
"Kurachi",
"Masafumi",
""
],
[
"Tanabashi",
"Masaharu",
""
]
] | Recently, Son and Stephanov have considered an "open moose" as a possible dual model of a QCD-like theory of chiral symmetry breaking. In this note we demonstrate that although the Weinberg sum rules are satisfied in any such model, the relevant sums converge very slowly and in a manner unlike QCD. Further, we show that such a model satisfies a set of generalized sum rules. These sum rules can be understood by looking at the operator product expansion for the correlation function of chiral currents, and correspond to the absence of low-dimension gauge-invariant chiral symmetry breaking condensates. These results imply that, regardless of the couplings and F-constants chosen, the open moose is not the dual of any QCD-like theory of chiral symmetry breaking. We also show that the generalized sum rules can be "solved", leading to a compact expression for the difference of vector- and axial-current correlation functions. This expression allows for a simple formula for the S parameter (L_10), which implies that S is always positive and of order one in any (unitary) open linear moose model. Therefore the S parameter is positive and order one in any "Higgsless model" based on the continuum limit of a linear moose regardless of the warping or position-dependent gauge-coupling chosen. |
hep-ph/0308272 | Munier | S. Munier | Some remarks on geometric scaling | 5 pages, talk presented at the 11th International Workshop on
Deep-Inelastic Scattering (DIS03), St. Petersburg, April 2003 | null | null | null | hep-ph | null | In order to explain a striking symmetry of the HERA data for virtual
photon-proton cross section, I propose a simple model based on the elementary
2-gluon exchange dipole-dipole cross section, and which exhibits geometric
scaling. I also suggest that geometric scaling should manifest itself in
exclusive processes. A preliminary search for this property in the HERA data is
presented.
| [
{
"created": "Wed, 27 Aug 2003 09:26:37 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Munier",
"S.",
""
]
] | In order to explain a striking symmetry of the HERA data for virtual photon-proton cross section, I propose a simple model based on the elementary 2-gluon exchange dipole-dipole cross section, and which exhibits geometric scaling. I also suggest that geometric scaling should manifest itself in exclusive processes. A preliminary search for this property in the HERA data is presented. |
1501.06687 | Jan Cepila | Jan Cepila and Jes\'us Guillermo Contreras | Rapidity dependence of saturation in inclusive HERA data with the rcBK
equation | null | null | null | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The contribution of the different terms of the running-coupling
Balistky-Kovchegov (rcBK) equation to the description of inclusive HERA data is
discussed. Within this framework an alternative definition of the saturation
scale is presented. The definition is based on the ratio of the term
corresponding to the recombination of two dipoles to the term corresponding to
a dipole splitting. A similar ratio is used to study the contribution of the
recombination term to the evolution of inclusive HERA data with rapidity. It is
found that, although the data are well described, the behaviour of the
different terms of the rcBK equation for HERA kinematics is not what it is
naively expected from saturation arguments.
| [
{
"created": "Tue, 27 Jan 2015 08:44:24 GMT",
"version": "v1"
},
{
"created": "Tue, 28 Jul 2015 07:53:24 GMT",
"version": "v2"
},
{
"created": "Tue, 6 Sep 2016 09:08:52 GMT",
"version": "v3"
}
] | 2016-09-07 | [
[
"Cepila",
"Jan",
""
],
[
"Contreras",
"Jesús Guillermo",
""
]
] | The contribution of the different terms of the running-coupling Balistky-Kovchegov (rcBK) equation to the description of inclusive HERA data is discussed. Within this framework an alternative definition of the saturation scale is presented. The definition is based on the ratio of the term corresponding to the recombination of two dipoles to the term corresponding to a dipole splitting. A similar ratio is used to study the contribution of the recombination term to the evolution of inclusive HERA data with rapidity. It is found that, although the data are well described, the behaviour of the different terms of the rcBK equation for HERA kinematics is not what it is naively expected from saturation arguments. |
1203.2924 | Timothy Cohen | Timothy Cohen, David E. Morrissey, and Aaron Pierce | Electroweak Baryogenesis and Higgs Signatures | 21 pages, 4 figures; v2 refs added, minor changes, matches journal
version | null | 10.1103/PhysRevD.86.013009 | MCTP-12-07; SLAC-PUB-14889 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We explore the connection between the strength of the electroweak phase
transition and the properties of the Higgs boson. Our interest is in regions of
parameter space that can realize electroweak baryogenesis. We do so in a
simplified framework in which a single Higgs field couples to new scalar fields
charged under SU(3)_c by way of the Higgs portal. Such new scalars can make the
electroweak phase transition more strongly first-order, while contributing to
the effective Higgs boson couplings to gluons and photons through loop effects.
For Higgs boson masses in the range 115 GeV < m_h < 130 GeV, whenever the phase
transition becomes strong enough for successful electroweak baryogenesis, we
find that Higgs boson properties are modified by an amount observable by the
LHC. We also discuss the baryogenesis window of the minimal supersymmetric
standard model (MSSM), which appears to be under tension. Furthermore, we argue
that the discovery of a Higgs boson with standard model-like couplings to
gluons and photons will rule out electroweak baryogenesis in the MSSM.
| [
{
"created": "Tue, 13 Mar 2012 20:00:03 GMT",
"version": "v1"
},
{
"created": "Tue, 3 Jul 2012 22:12:02 GMT",
"version": "v2"
}
] | 2013-05-30 | [
[
"Cohen",
"Timothy",
""
],
[
"Morrissey",
"David E.",
""
],
[
"Pierce",
"Aaron",
""
]
] | We explore the connection between the strength of the electroweak phase transition and the properties of the Higgs boson. Our interest is in regions of parameter space that can realize electroweak baryogenesis. We do so in a simplified framework in which a single Higgs field couples to new scalar fields charged under SU(3)_c by way of the Higgs portal. Such new scalars can make the electroweak phase transition more strongly first-order, while contributing to the effective Higgs boson couplings to gluons and photons through loop effects. For Higgs boson masses in the range 115 GeV < m_h < 130 GeV, whenever the phase transition becomes strong enough for successful electroweak baryogenesis, we find that Higgs boson properties are modified by an amount observable by the LHC. We also discuss the baryogenesis window of the minimal supersymmetric standard model (MSSM), which appears to be under tension. Furthermore, we argue that the discovery of a Higgs boson with standard model-like couplings to gluons and photons will rule out electroweak baryogenesis in the MSSM. |
1610.02777 | Majid Modarres | M. Modarres, M.R. Masouminia, R. Aminzadeh-Nik and H.Hosseinkhani | LHC production of forward-center and forward-forward di-jets in the
$k_t$-factorization $unintegrated$ parton distribution frameworks | null | null | 10.1016/j.nuclphysb.2017.06.020 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The present work is devoted to study the high-energy $QCD$ events, such as
the di-jet productions from proton-proton inelastic collisions at the $LHC$ in
the forward-center and the forward-forward configurations, using the
$unintegrated$ parton distribution functions ($UPDF$) in the
$k_t$-factorization framework. The $UPDF$ of $Kimber$ et. al. ($KMR$) and
$Martin$ et.al. ($MRW$) are generated in the leading order ($LO$) and
next-to-leading order ($NLO$), using the $Harland-Lang$ et al. ($MMHT2014$)
$PDF$ libraries. While working in the forward-center and the forward-forward
rapidity sectors, one can probe the parton densities at very low longitudinal
momentum fractions ($x$). Therefore, such a computation can provide a valuable
test-field for these $UPDF$. We find very good agreement with the corresponding
di-jet production data available from $LHC$ experiments. On the other hand, as
we have also stated in our previous works, (i.e. the protons longitudinal and
transverse structure function as well as hadron-hadron $LHC$ $W/Z$ production),
the present calculations based on the $KMR$ prescriptions show a better
agreement with the corresponding experimental data. This conclusion is
achieved, due to the particular visualization of the angular ordering
constraint ($AOC$), despite the fact that the $LO-MRW$ and the $NLO-MRW$
formalisms both employ better theoretical descriptions of the
$Dokshitzer$-$Gribov$-$Lipatov$ -$Altarelli$-$Parisi$ ($DGLAP$) evolution
equation, and hence are expected to produce better results. The form of the
$AOC$ in the $KMR$ prescription automatically includes the re-summation of the
higher-order $ln({1/x})$ type contributions, i.e. the
$Balitski$-$Fadin$-$Kuraev$-$Lipatov$ ($BFKL$) logarithms, in the $LO$-$DGLAP$
evolution equation.
| [
{
"created": "Mon, 10 Oct 2016 05:59:46 GMT",
"version": "v1"
},
{
"created": "Wed, 19 Oct 2016 12:35:05 GMT",
"version": "v2"
},
{
"created": "Sat, 29 Oct 2016 08:51:38 GMT",
"version": "v3"
},
{
"created": "Sun, 11 Dec 2016 10:57:00 GMT",
"version": "v4"
}
] | 2017-08-23 | [
[
"Modarres",
"M.",
""
],
[
"Masouminia",
"M. R.",
""
],
[
"Aminzadeh-Nik",
"R.",
""
],
[
"Hosseinkhani",
"H.",
""
]
] | The present work is devoted to study the high-energy $QCD$ events, such as the di-jet productions from proton-proton inelastic collisions at the $LHC$ in the forward-center and the forward-forward configurations, using the $unintegrated$ parton distribution functions ($UPDF$) in the $k_t$-factorization framework. The $UPDF$ of $Kimber$ et. al. ($KMR$) and $Martin$ et.al. ($MRW$) are generated in the leading order ($LO$) and next-to-leading order ($NLO$), using the $Harland-Lang$ et al. ($MMHT2014$) $PDF$ libraries. While working in the forward-center and the forward-forward rapidity sectors, one can probe the parton densities at very low longitudinal momentum fractions ($x$). Therefore, such a computation can provide a valuable test-field for these $UPDF$. We find very good agreement with the corresponding di-jet production data available from $LHC$ experiments. On the other hand, as we have also stated in our previous works, (i.e. the protons longitudinal and transverse structure function as well as hadron-hadron $LHC$ $W/Z$ production), the present calculations based on the $KMR$ prescriptions show a better agreement with the corresponding experimental data. This conclusion is achieved, due to the particular visualization of the angular ordering constraint ($AOC$), despite the fact that the $LO-MRW$ and the $NLO-MRW$ formalisms both employ better theoretical descriptions of the $Dokshitzer$-$Gribov$-$Lipatov$ -$Altarelli$-$Parisi$ ($DGLAP$) evolution equation, and hence are expected to produce better results. The form of the $AOC$ in the $KMR$ prescription automatically includes the re-summation of the higher-order $ln({1/x})$ type contributions, i.e. the $Balitski$-$Fadin$-$Kuraev$-$Lipatov$ ($BFKL$) logarithms, in the $LO$-$DGLAP$ evolution equation. |
1811.02167 | Jing-Juan Qi | Jing-Juan Qi, Zhen-Yang Wang, Xin-Heng Guo, Zhen-Hua Zhang, Chao Wang | Study of $CP$ Violation in $B^-\rightarrow K^- \pi^+\pi^-$ and
$B^-\rightarrow K^- \sigma(600)$ decays in the QCD factorization approach | arXiv admin note: text overlap with arXiv:0704.1049 by other authors | Phys. Rev. D 99, 076010 (2019) | 10.1103/PhysRevD.99.076010 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this work, we study the localized $CP$ violation in $B^-\rightarrow
K^-\pi^+\pi^-$ and $B^-\rightarrow K^- \sigma(600)$ decays by employing the
quasi two-body QCD factorization approach. Both the resonance and the
nonresonance contributions are studied for the $B^-\rightarrow K^-\pi^+\pi^-$
decay. The resonance contributions include those not only from $[\pi\pi]$
channels including $\sigma(600)$, $\rho^0(770)$ and $\omega(782)$ but also from
$[K\pi]$ channels including $K^*(892)$, $K_0^*(1430)$, $K^*(1410)$, $K^*(1680)$
and $K_2^*(1430)$. By fitting the experimental data
$\mathcal{A_{CP}}(K^-\pi^+\pi^-)=0.678\pm0.078\pm0.0323\pm0.007$ for
$m_{K^-\pi^+}^2<15$ $\mathrm{GeV}^2$ and $0.08<m_{\pi^+\pi^-}^2<0.66$
$\mathrm{GeV}^2$, we get the end-point divergence parameters in our model,
$\phi_S \in [4.75, 5.95]$ and $\rho_S\in[4.2, 8]$. Using these results for
$\rho_S$ and $\phi_S$, we predict that the $CP$ asymmetry parameter
$\mathcal{A_{CP}} \in [-0.094, -0.034]$ and the branching fraction $\mathcal{B}
\in [1.82, 20.0]\times10^{-5}$ for the $B^-\rightarrow K^-\sigma(600)$ decay.
In addition, we also analyse contributions to the localized $CP$ asymmetry
$\mathcal{A_{CP}}(B^-\rightarrow K^-\pi^+\pi^-)$ from $[\pi\pi]$, $[K\pi]$
channel resonances and nonresonance individually, which are found to be
$\mathcal{A_{CP}}(B^-\rightarrow K^-[\pi^+\pi^-] \rightarrow
K^-\pi^+\pi^-)=0.585\pm0.045$, $\mathcal{A_{CP}}(B^-\rightarrow [K^-\pi^+] \pi
\rightarrow K^-\pi^+\pi^-)=0.086\pm0.021$ and
$\mathcal{A_{CP}}^{NR}(B^-\rightarrow K^-\pi^+\pi^-)=0.061\pm0.0042$,
respectively. Comparing these results, we can see that the localized $CP$
asymmetry in the $B^-\rightarrow K^-\pi^+\pi^-$ decay is mainly induced by the
$[\pi\pi]$ channel resonances while contributions from the $[K\pi]$ channel
resonances and nonresonance are both very small.
| [
{
"created": "Tue, 6 Nov 2018 05:12:23 GMT",
"version": "v1"
}
] | 2019-04-24 | [
[
"Qi",
"Jing-Juan",
""
],
[
"Wang",
"Zhen-Yang",
""
],
[
"Guo",
"Xin-Heng",
""
],
[
"Zhang",
"Zhen-Hua",
""
],
[
"Wang",
"Chao",
""
]
] | In this work, we study the localized $CP$ violation in $B^-\rightarrow K^-\pi^+\pi^-$ and $B^-\rightarrow K^- \sigma(600)$ decays by employing the quasi two-body QCD factorization approach. Both the resonance and the nonresonance contributions are studied for the $B^-\rightarrow K^-\pi^+\pi^-$ decay. The resonance contributions include those not only from $[\pi\pi]$ channels including $\sigma(600)$, $\rho^0(770)$ and $\omega(782)$ but also from $[K\pi]$ channels including $K^*(892)$, $K_0^*(1430)$, $K^*(1410)$, $K^*(1680)$ and $K_2^*(1430)$. By fitting the experimental data $\mathcal{A_{CP}}(K^-\pi^+\pi^-)=0.678\pm0.078\pm0.0323\pm0.007$ for $m_{K^-\pi^+}^2<15$ $\mathrm{GeV}^2$ and $0.08<m_{\pi^+\pi^-}^2<0.66$ $\mathrm{GeV}^2$, we get the end-point divergence parameters in our model, $\phi_S \in [4.75, 5.95]$ and $\rho_S\in[4.2, 8]$. Using these results for $\rho_S$ and $\phi_S$, we predict that the $CP$ asymmetry parameter $\mathcal{A_{CP}} \in [-0.094, -0.034]$ and the branching fraction $\mathcal{B} \in [1.82, 20.0]\times10^{-5}$ for the $B^-\rightarrow K^-\sigma(600)$ decay. In addition, we also analyse contributions to the localized $CP$ asymmetry $\mathcal{A_{CP}}(B^-\rightarrow K^-\pi^+\pi^-)$ from $[\pi\pi]$, $[K\pi]$ channel resonances and nonresonance individually, which are found to be $\mathcal{A_{CP}}(B^-\rightarrow K^-[\pi^+\pi^-] \rightarrow K^-\pi^+\pi^-)=0.585\pm0.045$, $\mathcal{A_{CP}}(B^-\rightarrow [K^-\pi^+] \pi \rightarrow K^-\pi^+\pi^-)=0.086\pm0.021$ and $\mathcal{A_{CP}}^{NR}(B^-\rightarrow K^-\pi^+\pi^-)=0.061\pm0.0042$, respectively. Comparing these results, we can see that the localized $CP$ asymmetry in the $B^-\rightarrow K^-\pi^+\pi^-$ decay is mainly induced by the $[\pi\pi]$ channel resonances while contributions from the $[K\pi]$ channel resonances and nonresonance are both very small. |
0709.1568 | Tatsumi Aoyama | T. Aoyama, M. Hayakawa, T. Kinoshita, and M. Nio | Automated Calculation Scheme for alpha^n Contributions of QED to Lepton
g-2: New Treatment of Infrared Divergence for Diagrams without Lepton Loops | 36 pages | Nucl.Phys.B796:184-210,2008 | 10.1016/j.nuclphysb.2007.12.013 | null | hep-ph hep-th | null | We have developed an efficient algorithm for the subtraction of infrared
divergences that arise in the evaluation of QED corrections to the anomalous
magnetic moment of lepton (g-2). By incorporating this new algorithm, we have
extended the automated code-generating system developed previously to deal with
diagrams without internal lepton loops (called q-type), which produced
convergent integrals when applied to diagrams that have only
ultraviolet-divergent subdiagrams of vertex type. The new system produces
finite integrals for all q-type diagrams, including those that contain
self-energy subdiagrams and thus exhibit infrared-divergent behavior. We have
thus far verified the system for the sixth- and eighth-order cases. We are now
evaluating 6354 vertex diagrams of q-type that contribute to the tenth-order
lepton g-2.
| [
{
"created": "Tue, 11 Sep 2007 10:38:56 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Aoyama",
"T.",
""
],
[
"Hayakawa",
"M.",
""
],
[
"Kinoshita",
"T.",
""
],
[
"Nio",
"M.",
""
]
] | We have developed an efficient algorithm for the subtraction of infrared divergences that arise in the evaluation of QED corrections to the anomalous magnetic moment of lepton (g-2). By incorporating this new algorithm, we have extended the automated code-generating system developed previously to deal with diagrams without internal lepton loops (called q-type), which produced convergent integrals when applied to diagrams that have only ultraviolet-divergent subdiagrams of vertex type. The new system produces finite integrals for all q-type diagrams, including those that contain self-energy subdiagrams and thus exhibit infrared-divergent behavior. We have thus far verified the system for the sixth- and eighth-order cases. We are now evaluating 6354 vertex diagrams of q-type that contribute to the tenth-order lepton g-2. |
1502.01499 | Wen-long Sang | Wen-Long Sang, Feng Feng, Yu-Qi Chen | Relativistic corrections to $\Upsilon$ exclusive decay into double
$S-$wave charmonia | 11 pages, 2 figures. v2: added an appendix, corrected some typos | Phys. Rev. D 92, 014025 (2015) | 10.1103/PhysRevD.92.014025 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Within the framework of nonrelativisitic QCD factorization formalism, we
present the next-to-leading-order relativistic corrections to $\Upsilon$
exclusive decay into $\eta_c$ plus $J/\psi$. The double charmonia can be
produced through several immediate channels, i.e. $\Upsilon\to g^*g^*g^*\to
\eta_c+J/\psi$, $\Upsilon\to g^*g^*\gamma^*\to \eta_c+J/\psi$, and $\Upsilon\to
\gamma^*\to \eta_c+J/\psi$. The amplitudes of these three channels are obtained
accurate up to ${\cal O}(\alpha_s^3 v^2)$, ${\cal O}(\alpha\alpha_s^2 v^2)$,
and ${\cal O}(\alpha\alpha_s^2 v^2)$ respectively, where $v$ indicates the
typical heavy quark velocity in bottomonium and/or charmonium rest frame. The
decay rates are also presented. We find the next-to-leading-order relativistic
corrections to the short distance coefficients as well as the decay rates are
both significant and negative, especially for the corrections from bottomonium.
More seriously, the decay rates are even brought into negative by including the
relativistic corrections, which indicates the poor convergence for the velocity
expansion in this kind of processes. Detailed analysis is given in the paper.
| [
{
"created": "Thu, 5 Feb 2015 11:06:43 GMT",
"version": "v1"
},
{
"created": "Mon, 20 Jul 2015 05:57:40 GMT",
"version": "v2"
}
] | 2015-07-29 | [
[
"Sang",
"Wen-Long",
""
],
[
"Feng",
"Feng",
""
],
[
"Chen",
"Yu-Qi",
""
]
] | Within the framework of nonrelativisitic QCD factorization formalism, we present the next-to-leading-order relativistic corrections to $\Upsilon$ exclusive decay into $\eta_c$ plus $J/\psi$. The double charmonia can be produced through several immediate channels, i.e. $\Upsilon\to g^*g^*g^*\to \eta_c+J/\psi$, $\Upsilon\to g^*g^*\gamma^*\to \eta_c+J/\psi$, and $\Upsilon\to \gamma^*\to \eta_c+J/\psi$. The amplitudes of these three channels are obtained accurate up to ${\cal O}(\alpha_s^3 v^2)$, ${\cal O}(\alpha\alpha_s^2 v^2)$, and ${\cal O}(\alpha\alpha_s^2 v^2)$ respectively, where $v$ indicates the typical heavy quark velocity in bottomonium and/or charmonium rest frame. The decay rates are also presented. We find the next-to-leading-order relativistic corrections to the short distance coefficients as well as the decay rates are both significant and negative, especially for the corrections from bottomonium. More seriously, the decay rates are even brought into negative by including the relativistic corrections, which indicates the poor convergence for the velocity expansion in this kind of processes. Detailed analysis is given in the paper. |
2404.09767 | Lata Thakur | Sadaf Madni, Lata Thakur, Najmul Haque | Electrical conductivity of QGP with quasiparticle quarks and Gribov
gluon | 9 pages, 9 figures | null | null | null | hep-ph nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We investigate the electrical conductivity of a quark-gluon plasma (QGP)
medium using non-perturbative resummation via Gribov gluon propagator. To
calculate the electrical conductivity, we utilize the relativistic Boltzmann's
kinetic equation, within the relaxation-time approximation (RTA). The
relaxation times are obtained by computing the microscopic two-body scattering
amplitude. We adopt the quasiparticle approach, which allows us to comprehend
the transport properties in both the weak and strong coupling regimes. Above
the transition temperature, we estimate the electrical conductivity of the
quark-gluon plasma using the Gribov prescription and compare our findings with
lattice results and various phenomenological models. We find our results in
close agreement with the lattice data.
| [
{
"created": "Mon, 15 Apr 2024 13:13:03 GMT",
"version": "v1"
}
] | 2024-04-16 | [
[
"Madni",
"Sadaf",
""
],
[
"Thakur",
"Lata",
""
],
[
"Haque",
"Najmul",
""
]
] | We investigate the electrical conductivity of a quark-gluon plasma (QGP) medium using non-perturbative resummation via Gribov gluon propagator. To calculate the electrical conductivity, we utilize the relativistic Boltzmann's kinetic equation, within the relaxation-time approximation (RTA). The relaxation times are obtained by computing the microscopic two-body scattering amplitude. We adopt the quasiparticle approach, which allows us to comprehend the transport properties in both the weak and strong coupling regimes. Above the transition temperature, we estimate the electrical conductivity of the quark-gluon plasma using the Gribov prescription and compare our findings with lattice results and various phenomenological models. We find our results in close agreement with the lattice data. |
1905.05187 | Nuno Rosa Agostinho | Eduardo da Silva Almeida, N. Rosa Agostinho, Oscar J. P. \'Eboli and
M. C. Gonzalez-Garcia | Light-Quark Dipole Operators at LHC | 13 pages, 5 figures | Phys. Rev. D 100, 013003 (2019) | 10.1103/PhysRevD.100.013003 | YITP-SB-19-14 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the effect of operators generating dipole couplings of the light
quarks to electroweak gauge bosons on several observables at LHC. We start by
demonstrating that the determination of the gauge boson self-couplings from
electroweak diboson production at LHC is robust under the inclusion of those
quark dipole operators even when let them totally unconstrained in the
analysis. Conversely, we determine the bounds that the diboson data imposes on
the light-quark dipole couplings and show that they represent a significant
improvement over the limits arising from Z and W electroweak precision
measurements. We also explore the sensitivity of the Drell-Yan cross section
determination at LHC Run 1, and the results on resonance searches in high
invariant-mass lepton pair production at Run 2 to further constrain the
electroweak dipole couplings of the light quarks.
| [
{
"created": "Mon, 13 May 2019 18:00:00 GMT",
"version": "v1"
}
] | 2019-07-31 | [
[
"Almeida",
"Eduardo da Silva",
""
],
[
"Agostinho",
"N. Rosa",
""
],
[
"Éboli",
"Oscar J. P.",
""
],
[
"Gonzalez-Garcia",
"M. C.",
""
]
] | We study the effect of operators generating dipole couplings of the light quarks to electroweak gauge bosons on several observables at LHC. We start by demonstrating that the determination of the gauge boson self-couplings from electroweak diboson production at LHC is robust under the inclusion of those quark dipole operators even when let them totally unconstrained in the analysis. Conversely, we determine the bounds that the diboson data imposes on the light-quark dipole couplings and show that they represent a significant improvement over the limits arising from Z and W electroweak precision measurements. We also explore the sensitivity of the Drell-Yan cross section determination at LHC Run 1, and the results on resonance searches in high invariant-mass lepton pair production at Run 2 to further constrain the electroweak dipole couplings of the light quarks. |
1507.00013 | Jamie Tattersall Dr | Johann Brehmer, JoAnne Hewett, Joachim Kopp, Thomas Rizzo, Jamie
Tattersall | Symmetry Restored in Dibosons at the LHC? | 25 pages, 12 figures, V2: references added, extended discussion of
Minimal Left-Right Dark Matter, small correction to decay width - conclusions
unchanged, V3: expanded discussion of input parameters and statistical
procedure, V4: matches published version | null | null | MITP/15-046, SLAC-PUB-16319, TKK-15-15 | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A number of LHC resonance search channels display an excess in the invariant
mass region of 1.8 - 2.0 TeV. Among them is a $3.4\,\sigma$ excess in the fully
hadronic decay of a pair of Standard Model electroweak gauge bosons, in
addition to potential signals in the $HW$ and dijet final states. We perform a
model-independent cross-section fit to the results of all ATLAS and CMS
searches sensitive to these final states. We then interpret these results in
the context of the Left-Right Symmetric Model, based on the extended gauge
group $SU(2)_L\times SU(2)_R\times U(1)'$, and show that a heavy right-handed
gauge boson $W_R$ can naturally explain the current measurements with just a
single coupling $g_R \sim 0.4$. In addition, we discuss a possible connection
to dark matter.
| [
{
"created": "Tue, 30 Jun 2015 20:02:08 GMT",
"version": "v1"
},
{
"created": "Thu, 23 Jul 2015 07:57:56 GMT",
"version": "v2"
},
{
"created": "Wed, 16 Sep 2015 12:52:31 GMT",
"version": "v3"
},
{
"created": "Thu, 12 Nov 2015 15:03:38 GMT",
"version": "v4"
}
] | 2015-11-13 | [
[
"Brehmer",
"Johann",
""
],
[
"Hewett",
"JoAnne",
""
],
[
"Kopp",
"Joachim",
""
],
[
"Rizzo",
"Thomas",
""
],
[
"Tattersall",
"Jamie",
""
]
] | A number of LHC resonance search channels display an excess in the invariant mass region of 1.8 - 2.0 TeV. Among them is a $3.4\,\sigma$ excess in the fully hadronic decay of a pair of Standard Model electroweak gauge bosons, in addition to potential signals in the $HW$ and dijet final states. We perform a model-independent cross-section fit to the results of all ATLAS and CMS searches sensitive to these final states. We then interpret these results in the context of the Left-Right Symmetric Model, based on the extended gauge group $SU(2)_L\times SU(2)_R\times U(1)'$, and show that a heavy right-handed gauge boson $W_R$ can naturally explain the current measurements with just a single coupling $g_R \sim 0.4$. In addition, we discuss a possible connection to dark matter. |
1410.4423 | Paulo Victor Recchia Gomes Silva | D.A. Fagundes, M.J. Menon, P.V.R.G. Silva | Asymptotic Scenarios for the Proton's Central Opacity: An Empirical
Study | 5 pages, 1 figure added, extended text, matchs proceedings
(Diffraction 2014) | null | 10.1063/1.4915978 | null | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present a model-independent analysis of the experimental data on the ratio
$X$ between the elastic and total cross-sections from $pp$ and $\bar{p}p$
scattering in the c.m. energy interval 5 GeV - 8 TeV. Using a novel empirical
parametrization for that ratio as a function of the energy and based on
theoretical and empirical arguments, we investigate three distinct asymptotic
scenarios: either the black-disk (BD) limit or scenarios above and below that
limit. Our analysis favors a scenario below the BD, with asymptotic ratio $X =
0.36 \pm 0.08$.
| [
{
"created": "Thu, 16 Oct 2014 13:50:14 GMT",
"version": "v1"
},
{
"created": "Sun, 19 Oct 2014 16:51:42 GMT",
"version": "v2"
}
] | 2015-06-23 | [
[
"Fagundes",
"D. A.",
""
],
[
"Menon",
"M. J.",
""
],
[
"Silva",
"P. V. R. G.",
""
]
] | We present a model-independent analysis of the experimental data on the ratio $X$ between the elastic and total cross-sections from $pp$ and $\bar{p}p$ scattering in the c.m. energy interval 5 GeV - 8 TeV. Using a novel empirical parametrization for that ratio as a function of the energy and based on theoretical and empirical arguments, we investigate three distinct asymptotic scenarios: either the black-disk (BD) limit or scenarios above and below that limit. Our analysis favors a scenario below the BD, with asymptotic ratio $X = 0.36 \pm 0.08$. |
hep-ph/9610405 | Raghavan Rangarajan | Alexandre Dolgov, Katherine Freese, Raghavan Rangarajan and Mark
Srednicki | Baryogenesis During Reheating in Natural Inflation and Comments on
Spontaneous Baryogenesis | 22 pages, TeX, no figures. Submitted to Physical Review D | Phys.Rev. D56 (1997) 6155-6165 | 10.1103/PhysRevD.56.6155 | ACT-09/96, TAC-96-015, UCSBTH-96-19, UM-AC-96-05 | hep-ph | null | We calculate the baryon asymmetry created by the decay of a pseudo
Nambu-Goldstone boson whose interactions violate baryon number conservation.
Our results are in disagreement with previous results in the original
spontaneous baryogenesis models for the asymmetry produced by the decay of an
oscillating scalar field with B number violating derivative couplings; we find
that the net baryon number density is proportional to $\th_i^3$, where $\th_i$
is the amplitude of the PNGB-field in natural inflation at the onset of
reheating. We also discuss our disagreement with the interpretation of
$\dot\theta$ as an effective chemical potential for baryon number in
spontaneous baryogenesis models. While our calculation of the asymmetry is
carried out in the context of natural inflation our approach is generally valid
for baryogenesis models using decaying classical fields. In the Appendices, we
include a complete derivation of the number density of particles produced by
the decay of a classical scalar field; this number density is proportional to
the integral over momenta of the one pair production amplitude.
| [
{
"created": "Fri, 18 Oct 1996 05:44:28 GMT",
"version": "v1"
}
] | 2009-10-30 | [
[
"Dolgov",
"Alexandre",
""
],
[
"Freese",
"Katherine",
""
],
[
"Rangarajan",
"Raghavan",
""
],
[
"Srednicki",
"Mark",
""
]
] | We calculate the baryon asymmetry created by the decay of a pseudo Nambu-Goldstone boson whose interactions violate baryon number conservation. Our results are in disagreement with previous results in the original spontaneous baryogenesis models for the asymmetry produced by the decay of an oscillating scalar field with B number violating derivative couplings; we find that the net baryon number density is proportional to $\th_i^3$, where $\th_i$ is the amplitude of the PNGB-field in natural inflation at the onset of reheating. We also discuss our disagreement with the interpretation of $\dot\theta$ as an effective chemical potential for baryon number in spontaneous baryogenesis models. While our calculation of the asymmetry is carried out in the context of natural inflation our approach is generally valid for baryogenesis models using decaying classical fields. In the Appendices, we include a complete derivation of the number density of particles produced by the decay of a classical scalar field; this number density is proportional to the integral over momenta of the one pair production amplitude. |
1612.09132 | Tom\'a\v{s} Nosek | Tomas Nosek | Effects of Matter in Neutrino Oscillations and Determination of Neutrino
Mass Hierarchy at Long-baseline Experiments | 6 pages, 5 figures. Week of Doctoral Students 2016, Faculty of
Mathematics and Physics, Charles University, Prague, WDS'16 Proceedings of
Contributed Papers -- Physics (eds. J. Safrankova and J. Pavlu), Prague,
Matfyzpress, pp. 15--20, 2016 | WDS'16 Proceedings of Contributed Papers Physics (eds. J.
Safrankova and J. Pavlu), Prague, Matfyzpress, pp. 15-20 (2016) | null | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Neutrino oscillations change when in media in comparison to vacuum
oscillations due to the scattering of neutrinos on matter constituents,
electrons particularly. This can be easily described by introducing new
effective matter mixing angles and squared mass-splittings. Exploiting the
matter effects and subsequent enhancement or suppression of oscillation
probabilities can be used to determine the hierarchy of neutrino mass states.
Recent long-baseline experiments NO$\nu$A and T2K investigate this possibility.
Together NO$\nu$A and T2K combined can reject the wrong hierarchy for more than
20% of all possible values of yet unknown CP violating phase $\delta$ $\in$
[-180$^\circ$, 180$^\circ$].
| [
{
"created": "Thu, 29 Dec 2016 13:14:50 GMT",
"version": "v1"
},
{
"created": "Fri, 30 Dec 2016 10:31:44 GMT",
"version": "v2"
},
{
"created": "Mon, 23 Jan 2017 17:10:00 GMT",
"version": "v3"
}
] | 2018-10-02 | [
[
"Nosek",
"Tomas",
""
]
] | Neutrino oscillations change when in media in comparison to vacuum oscillations due to the scattering of neutrinos on matter constituents, electrons particularly. This can be easily described by introducing new effective matter mixing angles and squared mass-splittings. Exploiting the matter effects and subsequent enhancement or suppression of oscillation probabilities can be used to determine the hierarchy of neutrino mass states. Recent long-baseline experiments NO$\nu$A and T2K investigate this possibility. Together NO$\nu$A and T2K combined can reject the wrong hierarchy for more than 20% of all possible values of yet unknown CP violating phase $\delta$ $\in$ [-180$^\circ$, 180$^\circ$]. |
1911.06301 | Shu Luo | Shu Luo | Neutrino Oscillation in Dense Matter | 34 pages, 13 figures; more discussions and references added, some
figures updated, typos and inconsistencies fixed, while results and
conclusions unchanged; accepted for publication in Phy. Rev. D | Phys. Rev. D 101, 033005 (2020) | 10.1103/PhysRevD.101.033005 | null | hep-ph astro-ph.HE | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | As the increasing of neutrino energy or matter density, the neutrino
oscillation in matter may undergo "vacuum-dominated", "resonance" and
"matter-dominated" three different stages successively. Neutrinos endure very
different matter effects, and therefore present very different oscillation
behaviors in these three different cases. In this paper, we focus on the less
discussed matter-dominated case (i.e., $|A^{}_{\rm CC}| \gg |\Delta
m^{2}_{31}|$), study the effective neutrino mass and mixing parameters as well
as neutrino oscillation probabilities in dense matter using the perturbation
theory. We find that as the matter parameter $|A^{}_{\rm CC}|$ growing larger,
the effective mixing matrix in matter $\tilde{V}$ evolves approaching a fixed
$3 \times 3$ constant real matrix which is free of CP violation and can be
described using only one simple mixing angle $\tilde{\theta}$ which is
independent of $A^{}_{\rm CC}$. As for the neutrino oscillation behavior,
$\nu^{}_{e}$ decoupled in the matter-dominated case due to its intense
charged-current interaction with electrons while a two-flavor oscillation are
still presented between $\nu^{}_{\mu}$ and $\nu^{}_{\tau}$. Numerical analysis
are carried on to help understanding the salient features of neutrino
oscillation in matter as well as testing the validity of those concise
approximate formulas we obtained. At the end of this paper, we make a very bold
comparison of the oscillation behaviors between neutrinos passing through the
Earth and passing through a typical white dwarf to give some embryo thoughts on
under what circumstances these studies will be applied and put forward the
interesting idea of possible "neutrino lensing" effect.
| [
{
"created": "Thu, 14 Nov 2019 18:38:54 GMT",
"version": "v1"
},
{
"created": "Fri, 31 Jan 2020 17:55:53 GMT",
"version": "v2"
}
] | 2020-02-26 | [
[
"Luo",
"Shu",
""
]
] | As the increasing of neutrino energy or matter density, the neutrino oscillation in matter may undergo "vacuum-dominated", "resonance" and "matter-dominated" three different stages successively. Neutrinos endure very different matter effects, and therefore present very different oscillation behaviors in these three different cases. In this paper, we focus on the less discussed matter-dominated case (i.e., $|A^{}_{\rm CC}| \gg |\Delta m^{2}_{31}|$), study the effective neutrino mass and mixing parameters as well as neutrino oscillation probabilities in dense matter using the perturbation theory. We find that as the matter parameter $|A^{}_{\rm CC}|$ growing larger, the effective mixing matrix in matter $\tilde{V}$ evolves approaching a fixed $3 \times 3$ constant real matrix which is free of CP violation and can be described using only one simple mixing angle $\tilde{\theta}$ which is independent of $A^{}_{\rm CC}$. As for the neutrino oscillation behavior, $\nu^{}_{e}$ decoupled in the matter-dominated case due to its intense charged-current interaction with electrons while a two-flavor oscillation are still presented between $\nu^{}_{\mu}$ and $\nu^{}_{\tau}$. Numerical analysis are carried on to help understanding the salient features of neutrino oscillation in matter as well as testing the validity of those concise approximate formulas we obtained. At the end of this paper, we make a very bold comparison of the oscillation behaviors between neutrinos passing through the Earth and passing through a typical white dwarf to give some embryo thoughts on under what circumstances these studies will be applied and put forward the interesting idea of possible "neutrino lensing" effect. |
hep-ph/9804408 | Susumu Koretune | Susumu Koretune | Flavor Asymmetry of the Sea Quarks in the Baryon Octet | 19 pages,Latex | Nucl.Phys. B526 (1998) 445-459 | 10.1016/S0550-3213(98)00361-7 | null | hep-ph nucl-th | null | We show that the chiral $SU(n)\otimes SU(n)$ flavor symmetry on the
null-plane severely restricts the sea quarks in the baryon octet. It predicts
large asymmetry for the light sea quarks $(u,d,s)$, and universality and
abundance for the heavy sea quarks. Further it is shown that existence of the
heavy sea quarks constrained by the same symmetry reduces the theoretical value
of the Ellis-Jaffe sum rule substantially.
| [
{
"created": "Mon, 27 Apr 1998 00:54:54 GMT",
"version": "v1"
}
] | 2009-10-31 | [
[
"Koretune",
"Susumu",
""
]
] | We show that the chiral $SU(n)\otimes SU(n)$ flavor symmetry on the null-plane severely restricts the sea quarks in the baryon octet. It predicts large asymmetry for the light sea quarks $(u,d,s)$, and universality and abundance for the heavy sea quarks. Further it is shown that existence of the heavy sea quarks constrained by the same symmetry reduces the theoretical value of the Ellis-Jaffe sum rule substantially. |
hep-ph/0406325 | John R. Hiller | S. J. Brodsky, V. A. Franke, J. R. Hiller, G. McCartor, S. A. Paston,
E. V. Prokhvatilov | A nonperturbative calculation of the electron's magnetic moment | 35 pages, elsart.cls, 3 figures | Nucl.Phys.B703:333-362,2004 | 10.1016/j.nuclphysb.2004.10.027 | SLAC-PUB-10506, UMN-D-04-1, SMUHEP/03-13 | hep-ph hep-th | null | In principle, the complete spectrum and bound-state wave functions of a
quantum field theory can be determined by finding the eigenvalues and
eigensolutions of its light-cone Hamiltonian. One of the challenges in
obtaining nonperturbative solutions for gauge theories such as QCD using
light-cone Hamiltonian methods is to renormalize the theory while preserving
Lorentz symmetries and gauge invariance. For example, the truncation of the
light-cone Fock space leads to uncompensated ultraviolet divergences. We
present two methods for consistently regularizing light-cone-quantized gauge
theories in Feynman and light-cone gauges: (1) the introduction of a spectrum
of Pauli-Villars fields which produces a finite theory while preserving Lorentz
invariance; (2) the augmentation of the gauge-theory Lagrangian with higher
derivatives. In the latter case, which is applicable to light-cone gauge (A^+ =
0), the A^- component of the gauge field is maintained as an independent degree
of freedom rather than a constraint. Finite-mass Pauli-Villars regulators can
also be used to compensate for neglected higher Fock states. As a test case, we
apply these regularization procedures to an approximate nonperturbative
computation of the anomalous magnetic moment of the electron in QED as a first
attempt to meet Feynman's famous challenge.
| [
{
"created": "Tue, 29 Jun 2004 15:38:08 GMT",
"version": "v1"
}
] | 2009-09-11 | [
[
"Brodsky",
"S. J.",
""
],
[
"Franke",
"V. A.",
""
],
[
"Hiller",
"J. R.",
""
],
[
"McCartor",
"G.",
""
],
[
"Paston",
"S. A.",
""
],
[
"Prokhvatilov",
"E. V.",
""
]
] | In principle, the complete spectrum and bound-state wave functions of a quantum field theory can be determined by finding the eigenvalues and eigensolutions of its light-cone Hamiltonian. One of the challenges in obtaining nonperturbative solutions for gauge theories such as QCD using light-cone Hamiltonian methods is to renormalize the theory while preserving Lorentz symmetries and gauge invariance. For example, the truncation of the light-cone Fock space leads to uncompensated ultraviolet divergences. We present two methods for consistently regularizing light-cone-quantized gauge theories in Feynman and light-cone gauges: (1) the introduction of a spectrum of Pauli-Villars fields which produces a finite theory while preserving Lorentz invariance; (2) the augmentation of the gauge-theory Lagrangian with higher derivatives. In the latter case, which is applicable to light-cone gauge (A^+ = 0), the A^- component of the gauge field is maintained as an independent degree of freedom rather than a constraint. Finite-mass Pauli-Villars regulators can also be used to compensate for neglected higher Fock states. As a test case, we apply these regularization procedures to an approximate nonperturbative computation of the anomalous magnetic moment of the electron in QED as a first attempt to meet Feynman's famous challenge. |
hep-ph/0205185 | Toshifumi Yamashita | Nobuhiro Maekawa, Toshifumi Yamashita | Two-Loop Analysis of Gauge Coupling Unification with Anomalous U(1)
Symmetry and Proton Decay | 18pages, 1figure, references added, discussion of SUSY threshold
added | Prog.Theor.Phys. 108 (2002) 719-735 | 10.1143/PTP.108.719 | KUNS-1786 | hep-ph | null | Recently, a new mechanism, which explains why the three gauge coupling
constants meet at a certain scale in the minimal supersymmetric standard model,
has been proposed in a scenario of grand unified theories with anomalous
$U(1)_A$ gauge symmetry. It is a non-trivial result that although there are
many superheavy fields whose mass scales are below the unification scale, this
mechanism explains this fact by means of one-loop renormalization group
equations. Since the unification scale generically becomes below the usual GUT
scale, $2\times 10^{16}$ GeV, and proton decay via dimension 5 operators is
suppressed, the scenario predicts that proton decay via dimension 6 operators,
$p\to e \pi^0$, will be observed in the near future. In this paper, we attempt
to estimate a reasonable range of values of the lifetime of the proton
predicted within this scenario by using a two-loop renormalization group
calculation and the ambiguities of \order1 coefficients.
| [
{
"created": "Fri, 17 May 2002 12:39:45 GMT",
"version": "v1"
},
{
"created": "Wed, 29 May 2002 14:50:56 GMT",
"version": "v2"
},
{
"created": "Thu, 26 Sep 2002 13:48:17 GMT",
"version": "v3"
}
] | 2009-11-07 | [
[
"Maekawa",
"Nobuhiro",
""
],
[
"Yamashita",
"Toshifumi",
""
]
] | Recently, a new mechanism, which explains why the three gauge coupling constants meet at a certain scale in the minimal supersymmetric standard model, has been proposed in a scenario of grand unified theories with anomalous $U(1)_A$ gauge symmetry. It is a non-trivial result that although there are many superheavy fields whose mass scales are below the unification scale, this mechanism explains this fact by means of one-loop renormalization group equations. Since the unification scale generically becomes below the usual GUT scale, $2\times 10^{16}$ GeV, and proton decay via dimension 5 operators is suppressed, the scenario predicts that proton decay via dimension 6 operators, $p\to e \pi^0$, will be observed in the near future. In this paper, we attempt to estimate a reasonable range of values of the lifetime of the proton predicted within this scenario by using a two-loop renormalization group calculation and the ambiguities of \order1 coefficients. |
1809.03780 | Raghunath Sahoo | Arvind Khuntia, Swatantra Kumar Tiwari, Pramod Sharma, Raghunath
Sahoo, and Tapan Kumar Nayak | Effect of Hagedorn States on Isothermal Compressibility of Hadronic
Matter formed in Heavy-Ion Collisions: From NICA to LHC Energies | Same as published paper | Phys. Rev. C 100, 014910 (2019) | 10.1103/PhysRevC.100.014910 | null | hep-ph nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this work, we have studied the isothermal compressibility ($\kappa_T$) as
a function of temperature, baryon chemical potential and centre-of-mass energy
($\sqrt{s_{NN}}$) using hadron resonance gas (HRG) and excluded-volume hadron
resonance gas (EV-HRG) models. A mass cut-off dependence of isothermal
compressibility has been studied for a physical resonance gas. Further, we
study the effect of heavier resonances ($>$ 2 GeV) on the isothermal
compressibility by considering the Hagedorn mass spectrum,
${\rho}(m)\sim{\exp(bm)}/{(m^2+m_0^2)^{5/4}}$. Here, the parameters, $b$ and
$m_0$ are extracted after comparing the results of recent lattice QCD
simulations at finite baryonic chemical potential. We find a significant
difference between the results obtained in EV-HRG and HRG models at a higher
temperatures and higher baryochemical potentials. The inclusion of the Hagedorn
mass spectrum in the partition function for hadron gas has a large effect at a
higher temperature. A higher mass cut-off in the Hagedorn mass spectrum takes
the isothermal compressibility to a minimum value, which occurs near the
Hagedorn temperature ($T_H$). We show explicitly that at the future low energy
accelerator facilities like FAIR (CBM), Darmstadt and NICA, Dubna the created
matter would be incompressible compared to the high energy facilities like RHIC
and LHC.
| [
{
"created": "Tue, 11 Sep 2018 10:17:15 GMT",
"version": "v1"
},
{
"created": "Fri, 21 Sep 2018 13:35:30 GMT",
"version": "v2"
},
{
"created": "Tue, 30 Jul 2019 15:27:53 GMT",
"version": "v3"
}
] | 2019-08-07 | [
[
"Khuntia",
"Arvind",
""
],
[
"Tiwari",
"Swatantra Kumar",
""
],
[
"Sharma",
"Pramod",
""
],
[
"Sahoo",
"Raghunath",
""
],
[
"Nayak",
"Tapan Kumar",
""
]
] | In this work, we have studied the isothermal compressibility ($\kappa_T$) as a function of temperature, baryon chemical potential and centre-of-mass energy ($\sqrt{s_{NN}}$) using hadron resonance gas (HRG) and excluded-volume hadron resonance gas (EV-HRG) models. A mass cut-off dependence of isothermal compressibility has been studied for a physical resonance gas. Further, we study the effect of heavier resonances ($>$ 2 GeV) on the isothermal compressibility by considering the Hagedorn mass spectrum, ${\rho}(m)\sim{\exp(bm)}/{(m^2+m_0^2)^{5/4}}$. Here, the parameters, $b$ and $m_0$ are extracted after comparing the results of recent lattice QCD simulations at finite baryonic chemical potential. We find a significant difference between the results obtained in EV-HRG and HRG models at a higher temperatures and higher baryochemical potentials. The inclusion of the Hagedorn mass spectrum in the partition function for hadron gas has a large effect at a higher temperature. A higher mass cut-off in the Hagedorn mass spectrum takes the isothermal compressibility to a minimum value, which occurs near the Hagedorn temperature ($T_H$). We show explicitly that at the future low energy accelerator facilities like FAIR (CBM), Darmstadt and NICA, Dubna the created matter would be incompressible compared to the high energy facilities like RHIC and LHC. |
hep-ph/0403140 | Pasquale Calabrese | Pasquale Calabrese and Pietro Parruccini | Five-loop epsilon expansion for U(n)xU(m) models: finite-temperature
phase transition in light QCD | 12 pages, no figure | JHEP 0405 (2004) 018 | 10.1088/1126-6708/2004/05/018 | null | hep-ph cond-mat.stat-mech hep-lat | null | We consider the U(n)xU(m) symmetric Phi^4 Lagrangian to describe the
finite-temperature phase transition in QCD in the limit of vanishing quark
masses with n=m=N_f flavors and unbroken anomaly at T_c. We compute the
Renormalization Group functions to five-loop order in Minimal Subtraction
scheme. Such higher order functions allow to describe accurately the
three-dimensional fixed-point structure in the plane (n,m), and to reconstruct
the line n^+(m,d) which limits the region of second-order phase transitions by
an expansion in epsilon=4-d. We always find n^+(m,3)>m, thus no
three-dimensional stable fixed point exists for $n=m$ and the finite
temperature transition in light QCD should be first-order. This result is
confirmed by the pseudo-epsilon analysis of massive six-loop three dimensional
series.
| [
{
"created": "Fri, 12 Mar 2004 16:02:41 GMT",
"version": "v1"
}
] | 2009-11-10 | [
[
"Calabrese",
"Pasquale",
""
],
[
"Parruccini",
"Pietro",
""
]
] | We consider the U(n)xU(m) symmetric Phi^4 Lagrangian to describe the finite-temperature phase transition in QCD in the limit of vanishing quark masses with n=m=N_f flavors and unbroken anomaly at T_c. We compute the Renormalization Group functions to five-loop order in Minimal Subtraction scheme. Such higher order functions allow to describe accurately the three-dimensional fixed-point structure in the plane (n,m), and to reconstruct the line n^+(m,d) which limits the region of second-order phase transitions by an expansion in epsilon=4-d. We always find n^+(m,3)>m, thus no three-dimensional stable fixed point exists for $n=m$ and the finite temperature transition in light QCD should be first-order. This result is confirmed by the pseudo-epsilon analysis of massive six-loop three dimensional series. |
1711.03878 | Kwei-Chou Yang | Kwei-Chou Yang | Search for Scalar Dark Matter via Pseudoscalar Portal Interactions: In
Light of the Galactic Center Gamma-Ray Excess | 31 pages, 1 table, 5 figures, typo in Eq. (7) corrected, caption of
Fig. 4 revised | Phys. Rev. D 97, 023025 (2018) | 10.1103/PhysRevD.97.023025 | CYCU-HEP-17-10 | hep-ph astro-ph.CO astro-ph.GA astro-ph.HE hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In light of the observed Galactic center gamma-ray excess, we investigate a
simplified model, for which the scalar dark matter interacts with quarks
through a pseudoscalar mediator. The viable regions of the parameter space,
that can also account for the relic density and evade the current searches, are
identified, if the low-velocity dark matter annihilates through an $s$-channel
off-shell mediator mostly into $\bar{b} b$, and/or annihilates directly into
two ${\it hidden}$ on-shell mediators, which subsequently decay into the quark
pairs. These two kinds of annihilations are $s$ wave. The projected monojet
limit set by the high luminosity LHC sensitivity could constrain the favored
parameter space, where the mediator's mass is larger than the dark matter mass
by a factor of 2. We show that the projected sensitivity of 15-year Fermi-LAT
observations of dwarf spheroidal galaxies can provide a stringent constraint on
the most parameter space allowed in this model. If the on-shell mediator
channel contributes to the dark matter annihilation cross sections over 50$\%$,
this model with a lighter mediator can be probed in the projected PICO-500L
experiment.
| [
{
"created": "Fri, 10 Nov 2017 15:32:16 GMT",
"version": "v1"
},
{
"created": "Wed, 17 Jan 2018 16:28:18 GMT",
"version": "v2"
},
{
"created": "Thu, 18 Jan 2018 15:54:40 GMT",
"version": "v3"
},
{
"created": "Tue, 24 Jul 2018 13:38:50 GMT",
"version": "v4"
}
] | 2018-07-25 | [
[
"Yang",
"Kwei-Chou",
""
]
] | In light of the observed Galactic center gamma-ray excess, we investigate a simplified model, for which the scalar dark matter interacts with quarks through a pseudoscalar mediator. The viable regions of the parameter space, that can also account for the relic density and evade the current searches, are identified, if the low-velocity dark matter annihilates through an $s$-channel off-shell mediator mostly into $\bar{b} b$, and/or annihilates directly into two ${\it hidden}$ on-shell mediators, which subsequently decay into the quark pairs. These two kinds of annihilations are $s$ wave. The projected monojet limit set by the high luminosity LHC sensitivity could constrain the favored parameter space, where the mediator's mass is larger than the dark matter mass by a factor of 2. We show that the projected sensitivity of 15-year Fermi-LAT observations of dwarf spheroidal galaxies can provide a stringent constraint on the most parameter space allowed in this model. If the on-shell mediator channel contributes to the dark matter annihilation cross sections over 50$\%$, this model with a lighter mediator can be probed in the projected PICO-500L experiment. |
hep-ph/0601006 | Sergey Troshin | S.M. Troshin, N.E. Tyurin | Indications for the new unitarity regime in the extensive air showers
measurements | 9 pages, 4 figures | null | null | null | hep-ph | null | We note that the new unitarity regime when scattering amplitude goes beyond
the black disc limit (antishadowing) could help in the explanation of the
regularities such as knee in the energy spectrum, existence of penetrating and
long-flying particles and other features observed in the measurements of the
extensive air showers which originate from cosmic particles interactions with
the atmosphere.
| [
{
"created": "Sun, 1 Jan 2006 11:16:23 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Troshin",
"S. M.",
""
],
[
"Tyurin",
"N. E.",
""
]
] | We note that the new unitarity regime when scattering amplitude goes beyond the black disc limit (antishadowing) could help in the explanation of the regularities such as knee in the energy spectrum, existence of penetrating and long-flying particles and other features observed in the measurements of the extensive air showers which originate from cosmic particles interactions with the atmosphere. |
1711.11360 | Sebastian Sapeta | Krzysztof Golec-Biernat, Sebastian Sapeta | Saturation model of DIS : an update | 16 pages, 8 figures; v2: several textual changes and additions, Table
2 added, version accepted by JHEP; v3: misprint corrected | JHEP 1803 (2018) 102 | 10.1007/JHEP03(2018)102 | IFJPAN-IV-2017-27 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present the results of new fits to the recently extracted data on $F_2$ at
low $x$ with the GBW saturation model and its modification to cover high values
of $Q^2$. We find that the model stands the test of time and gives a good
description of the data with slightly modified parameters. All the essential
elements of the model, especially the saturation scale, are retained.
| [
{
"created": "Thu, 30 Nov 2017 12:53:32 GMT",
"version": "v1"
},
{
"created": "Fri, 6 Apr 2018 13:53:45 GMT",
"version": "v2"
},
{
"created": "Fri, 13 Apr 2018 08:14:22 GMT",
"version": "v3"
}
] | 2020-05-20 | [
[
"Golec-Biernat",
"Krzysztof",
""
],
[
"Sapeta",
"Sebastian",
""
]
] | We present the results of new fits to the recently extracted data on $F_2$ at low $x$ with the GBW saturation model and its modification to cover high values of $Q^2$. We find that the model stands the test of time and gives a good description of the data with slightly modified parameters. All the essential elements of the model, especially the saturation scale, are retained. |
0806.1184 | Matthew Dolan | B. C. Allanach, M. J. Dolan and A. M. Weber | Global Fits of the Large Volume String Scenario to WMAP5 and Other
Indirect Constraints Using Markov Chain Monte Carlo | 30 pages, 10 figures | JHEP0808:105,2008 | 10.1088/1126-6708/2008/08/105 | DAMTP-2008-37 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present global fits to the Large Volume Scenario (LVS) of string models
using current indirect data. We use WMAP5 constraints on dark matter relic
density, b-physics and electroweak observables as well as direct search
constraints. Such data can be adequately fit by LVS, with the best-fit point
for mu>0 having chi^2=13.6 for 8 degrees of freedom. The resulting constraints
on parameter space are robust in that they do not depend much upon the prior,
or upon whether one uses Bayesian or frequentist interpretations of the data.
Sparticle masses are constrained to be well below the 1 TeV level, predicting
early SUSY discovery at the LHC. We devise a method of quantifying which are
the most important constraints. We find that the LEP2 Higgs mass constraint,
the relic density of dark matter and the anomalous magnetic moment of the muon
affect the fits to the strongest degree.
| [
{
"created": "Fri, 6 Jun 2008 15:31:08 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Allanach",
"B. C.",
""
],
[
"Dolan",
"M. J.",
""
],
[
"Weber",
"A. M.",
""
]
] | We present global fits to the Large Volume Scenario (LVS) of string models using current indirect data. We use WMAP5 constraints on dark matter relic density, b-physics and electroweak observables as well as direct search constraints. Such data can be adequately fit by LVS, with the best-fit point for mu>0 having chi^2=13.6 for 8 degrees of freedom. The resulting constraints on parameter space are robust in that they do not depend much upon the prior, or upon whether one uses Bayesian or frequentist interpretations of the data. Sparticle masses are constrained to be well below the 1 TeV level, predicting early SUSY discovery at the LHC. We devise a method of quantifying which are the most important constraints. We find that the LEP2 Higgs mass constraint, the relic density of dark matter and the anomalous magnetic moment of the muon affect the fits to the strongest degree. |
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